Move libata to drivers/ata.

23 files changed, 26711 insertions, 0 deletions

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
new file mode 100644
index 0000000..95d6b41
--- /dev/null
+++ b/drivers/ata/Kconfig
@@ -0,0 +1,140 @@
+
+config ATA
+	tristate "ATA device support"
+	depends on SCSI
+	---help---
+	  If you want to use a ATA hard disk, ATA tape drive, ATA CD-ROM or
+	  any other ATA device under Linux, say Y and make sure that you know
+	  the name of your ATA host adapter (the card inside your computer
+	  that "speaks" the ATA protocol, also called ATA controller),
+	  because you will be asked for it.
+
+config SCSI_SATA_AHCI
+	tristate "AHCI SATA support"
+	depends on ATA && PCI
+	help
+	  This option enables support for AHCI Serial ATA.
+
+	  If unsure, say N.
+
+config SCSI_SATA_SVW
+	tristate "ServerWorks Frodo / Apple K2 SATA support"
+	depends on ATA && PCI
+	help
+	  This option enables support for Broadcom/Serverworks/Apple K2
+	  SATA support.
+
+	  If unsure, say N.
+
+config SCSI_ATA_PIIX
+	tristate "Intel PIIX/ICH SATA support"
+	depends on ATA && PCI
+	help
+	  This option enables support for ICH5/6/7/8 Serial ATA.
+	  If PATA support was enabled previously, this enables
+	  support for select Intel PIIX/ICH PATA host controllers.
+
+	  If unsure, say N.
+
+config SCSI_SATA_MV
+	tristate "Marvell SATA support (HIGHLY EXPERIMENTAL)"
+	depends on ATA && PCI && EXPERIMENTAL
+	help
+	  This option enables support for the Marvell Serial ATA family.
+	  Currently supports 88SX[56]0[48][01] chips.
+
+	  If unsure, say N.
+
+config SCSI_SATA_NV
+	tristate "NVIDIA SATA support"
+	depends on ATA && PCI
+	help
+	  This option enables support for NVIDIA Serial ATA.
+
+	  If unsure, say N.
+
+config SCSI_PDC_ADMA
+	tristate "Pacific Digital ADMA support"
+	depends on ATA && PCI
+	help
+	  This option enables support for Pacific Digital ADMA controllers
+
+	  If unsure, say N.
+
+config SCSI_SATA_QSTOR
+	tristate "Pacific Digital SATA QStor support"
+	depends on ATA && PCI
+	help
+	  This option enables support for Pacific Digital Serial ATA QStor.
+
+	  If unsure, say N.
+
+config SCSI_SATA_PROMISE
+	tristate "Promise SATA TX2/TX4 support"
+	depends on ATA && PCI
+	help
+	  This option enables support for Promise Serial ATA TX2/TX4.
+
+	  If unsure, say N.
+
+config SCSI_SATA_SX4
+	tristate "Promise SATA SX4 support"
+	depends on ATA && PCI && EXPERIMENTAL
+	help
+	  This option enables support for Promise Serial ATA SX4.
+
+	  If unsure, say N.
+
+config SCSI_SATA_SIL
+	tristate "Silicon Image SATA support"
+	depends on ATA && PCI
+	help
+	  This option enables support for Silicon Image Serial ATA.
+
+	  If unsure, say N.
+
+config SCSI_SATA_SIL24
+	tristate "Silicon Image 3124/3132 SATA support"
+	depends on ATA && PCI
+	help
+	  This option enables support for Silicon Image 3124/3132 Serial ATA.
+
+	  If unsure, say N.
+
+config SCSI_SATA_SIS
+	tristate "SiS 964/180 SATA support"
+	depends on ATA && PCI
+	help
+	  This option enables support for SiS Serial ATA 964/180.
+
+	  If unsure, say N.
+
+config SCSI_SATA_ULI
+	tristate "ULi Electronics SATA support"
+	depends on ATA && PCI
+	help
+	  This option enables support for ULi Electronics SATA.
+
+	  If unsure, say N.
+
+config SCSI_SATA_VIA
+	tristate "VIA SATA support"
+	depends on ATA && PCI
+	help
+	  This option enables support for VIA Serial ATA.
+
+	  If unsure, say N.
+
+config SCSI_SATA_VITESSE
+	tristate "VITESSE VSC-7174 / INTEL 31244 SATA support"
+	depends on ATA && PCI
+	help
+	  This option enables support for Vitesse VSC7174 and Intel 31244 Serial ATA.
+
+	  If unsure, say N.
+
+config SCSI_SATA_INTEL_COMBINED
+	bool
+	depends on IDE=y && !BLK_DEV_IDE_SATA && (SCSI_SATA_AHCI || SCSI_ATA_PIIX)
+	default y
+
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
new file mode 100644
index 0000000..60bdb7b
--- /dev/null
+++ b/drivers/ata/Makefile
@@ -0,0 +1,19 @@
+
+obj-$(CONFIG_SCSI_SATA_AHCI)	+= libata.o ahci.o
+obj-$(CONFIG_SCSI_SATA_SVW)	+= libata.o sata_svw.o
+obj-$(CONFIG_SCSI_ATA_PIIX)	+= libata.o ata_piix.o
+obj-$(CONFIG_SCSI_SATA_PROMISE)	+= libata.o sata_promise.o
+obj-$(CONFIG_SCSI_SATA_QSTOR)	+= libata.o sata_qstor.o
+obj-$(CONFIG_SCSI_SATA_SIL)	+= libata.o sata_sil.o
+obj-$(CONFIG_SCSI_SATA_SIL24)	+= libata.o sata_sil24.o
+obj-$(CONFIG_SCSI_SATA_VIA)	+= libata.o sata_via.o
+obj-$(CONFIG_SCSI_SATA_VITESSE)	+= libata.o sata_vsc.o
+obj-$(CONFIG_SCSI_SATA_SIS)	+= libata.o sata_sis.o
+obj-$(CONFIG_SCSI_SATA_SX4)	+= libata.o sata_sx4.o
+obj-$(CONFIG_SCSI_SATA_NV)	+= libata.o sata_nv.o
+obj-$(CONFIG_SCSI_SATA_ULI)	+= libata.o sata_uli.o
+obj-$(CONFIG_SCSI_SATA_MV)	+= libata.o sata_mv.o
+obj-$(CONFIG_SCSI_PDC_ADMA)	+= libata.o pdc_adma.o
+
+libata-objs	:= libata-core.o libata-scsi.o libata-bmdma.o libata-eh.o
+
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
new file mode 100644
index 0000000..813031c
--- /dev/null
+++ b/drivers/ata/ahci.c
@@ -0,0 +1,1684 @@
+/*
+ *  ahci.c - AHCI SATA support
+ *
+ *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
+ *    		    Please ALWAYS copy linux-ide@vger.kernel.org
+ *		    on emails.
+ *
+ *  Copyright 2004-2005 Red Hat, Inc.
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ * libata documentation is available via 'make {ps|pdf}docs',
+ * as Documentation/DocBook/libata.*
+ *
+ * AHCI hardware documentation:
+ * http://www.intel.com/technology/serialata/pdf/rev1_0.pdf
+ * http://www.intel.com/technology/serialata/pdf/rev1_1.pdf
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+#include <linux/dma-mapping.h>
+#include <linux/device.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_cmnd.h>
+#include <linux/libata.h>
+#include <asm/io.h>
+
+#define DRV_NAME	"ahci"
+#define DRV_VERSION	"2.0"
+
+
+enum {
+	AHCI_PCI_BAR		= 5,
+	AHCI_MAX_SG		= 168, /* hardware max is 64K */
+	AHCI_DMA_BOUNDARY	= 0xffffffff,
+	AHCI_USE_CLUSTERING	= 0,
+	AHCI_MAX_CMDS		= 32,
+	AHCI_CMD_SZ		= 32,
+	AHCI_CMD_SLOT_SZ	= AHCI_MAX_CMDS * AHCI_CMD_SZ,
+	AHCI_RX_FIS_SZ		= 256,
+	AHCI_CMD_TBL_CDB	= 0x40,
+	AHCI_CMD_TBL_HDR_SZ	= 0x80,
+	AHCI_CMD_TBL_SZ		= AHCI_CMD_TBL_HDR_SZ + (AHCI_MAX_SG * 16),
+	AHCI_CMD_TBL_AR_SZ	= AHCI_CMD_TBL_SZ * AHCI_MAX_CMDS,
+	AHCI_PORT_PRIV_DMA_SZ	= AHCI_CMD_SLOT_SZ + AHCI_CMD_TBL_AR_SZ +
+				  AHCI_RX_FIS_SZ,
+	AHCI_IRQ_ON_SG		= (1 << 31),
+	AHCI_CMD_ATAPI		= (1 << 5),
+	AHCI_CMD_WRITE		= (1 << 6),
+	AHCI_CMD_PREFETCH	= (1 << 7),
+	AHCI_CMD_RESET		= (1 << 8),
+	AHCI_CMD_CLR_BUSY	= (1 << 10),
+
+	RX_FIS_D2H_REG		= 0x40,	/* offset of D2H Register FIS data */
+	RX_FIS_UNK		= 0x60, /* offset of Unknown FIS data */
+
+	board_ahci		= 0,
+	board_ahci_vt8251	= 1,
+
+	/* global controller registers */
+	HOST_CAP		= 0x00, /* host capabilities */
+	HOST_CTL		= 0x04, /* global host control */
+	HOST_IRQ_STAT		= 0x08, /* interrupt status */
+	HOST_PORTS_IMPL		= 0x0c, /* bitmap of implemented ports */
+	HOST_VERSION		= 0x10, /* AHCI spec. version compliancy */
+
+	/* HOST_CTL bits */
+	HOST_RESET		= (1 << 0),  /* reset controller; self-clear */
+	HOST_IRQ_EN		= (1 << 1),  /* global IRQ enable */
+	HOST_AHCI_EN		= (1 << 31), /* AHCI enabled */
+
+	/* HOST_CAP bits */
+	HOST_CAP_SSC		= (1 << 14), /* Slumber capable */
+	HOST_CAP_CLO		= (1 << 24), /* Command List Override support */
+	HOST_CAP_SSS		= (1 << 27), /* Staggered Spin-up */
+	HOST_CAP_NCQ		= (1 << 30), /* Native Command Queueing */
+	HOST_CAP_64		= (1 << 31), /* PCI DAC (64-bit DMA) support */
+
+	/* registers for each SATA port */
+	PORT_LST_ADDR		= 0x00, /* command list DMA addr */
+	PORT_LST_ADDR_HI	= 0x04, /* command list DMA addr hi */
+	PORT_FIS_ADDR		= 0x08, /* FIS rx buf addr */
+	PORT_FIS_ADDR_HI	= 0x0c, /* FIS rx buf addr hi */
+	PORT_IRQ_STAT		= 0x10, /* interrupt status */
+	PORT_IRQ_MASK		= 0x14, /* interrupt enable/disable mask */
+	PORT_CMD		= 0x18, /* port command */
+	PORT_TFDATA		= 0x20,	/* taskfile data */
+	PORT_SIG		= 0x24,	/* device TF signature */
+	PORT_CMD_ISSUE		= 0x38, /* command issue */
+	PORT_SCR		= 0x28, /* SATA phy register block */
+	PORT_SCR_STAT		= 0x28, /* SATA phy register: SStatus */
+	PORT_SCR_CTL		= 0x2c, /* SATA phy register: SControl */
+	PORT_SCR_ERR		= 0x30, /* SATA phy register: SError */
+	PORT_SCR_ACT		= 0x34, /* SATA phy register: SActive */
+
+	/* PORT_IRQ_{STAT,MASK} bits */
+	PORT_IRQ_COLD_PRES	= (1 << 31), /* cold presence detect */
+	PORT_IRQ_TF_ERR		= (1 << 30), /* task file error */
+	PORT_IRQ_HBUS_ERR	= (1 << 29), /* host bus fatal error */
+	PORT_IRQ_HBUS_DATA_ERR	= (1 << 28), /* host bus data error */
+	PORT_IRQ_IF_ERR		= (1 << 27), /* interface fatal error */
+	PORT_IRQ_IF_NONFATAL	= (1 << 26), /* interface non-fatal error */
+	PORT_IRQ_OVERFLOW	= (1 << 24), /* xfer exhausted available S/G */
+	PORT_IRQ_BAD_PMP	= (1 << 23), /* incorrect port multiplier */
+
+	PORT_IRQ_PHYRDY		= (1 << 22), /* PhyRdy changed */
+	PORT_IRQ_DEV_ILCK	= (1 << 7), /* device interlock */
+	PORT_IRQ_CONNECT	= (1 << 6), /* port connect change status */
+	PORT_IRQ_SG_DONE	= (1 << 5), /* descriptor processed */
+	PORT_IRQ_UNK_FIS	= (1 << 4), /* unknown FIS rx'd */
+	PORT_IRQ_SDB_FIS	= (1 << 3), /* Set Device Bits FIS rx'd */
+	PORT_IRQ_DMAS_FIS	= (1 << 2), /* DMA Setup FIS rx'd */
+	PORT_IRQ_PIOS_FIS	= (1 << 1), /* PIO Setup FIS rx'd */
+	PORT_IRQ_D2H_REG_FIS	= (1 << 0), /* D2H Register FIS rx'd */
+
+	PORT_IRQ_FREEZE		= PORT_IRQ_HBUS_ERR |
+				  PORT_IRQ_IF_ERR |
+				  PORT_IRQ_CONNECT |
+				  PORT_IRQ_PHYRDY |
+				  PORT_IRQ_UNK_FIS,
+	PORT_IRQ_ERROR		= PORT_IRQ_FREEZE |
+				  PORT_IRQ_TF_ERR |
+				  PORT_IRQ_HBUS_DATA_ERR,
+	DEF_PORT_IRQ		= PORT_IRQ_ERROR | PORT_IRQ_SG_DONE |
+				  PORT_IRQ_SDB_FIS | PORT_IRQ_DMAS_FIS |
+				  PORT_IRQ_PIOS_FIS | PORT_IRQ_D2H_REG_FIS,
+
+	/* PORT_CMD bits */
+	PORT_CMD_ATAPI		= (1 << 24), /* Device is ATAPI */
+	PORT_CMD_LIST_ON	= (1 << 15), /* cmd list DMA engine running */
+	PORT_CMD_FIS_ON		= (1 << 14), /* FIS DMA engine running */
+	PORT_CMD_FIS_RX		= (1 << 4), /* Enable FIS receive DMA engine */
+	PORT_CMD_CLO		= (1 << 3), /* Command list override */
+	PORT_CMD_POWER_ON	= (1 << 2), /* Power up device */
+	PORT_CMD_SPIN_UP	= (1 << 1), /* Spin up device */
+	PORT_CMD_START		= (1 << 0), /* Enable port DMA engine */
+
+	PORT_CMD_ICC_MASK	= (0xf << 28), /* i/f ICC state mask */
+	PORT_CMD_ICC_ACTIVE	= (0x1 << 28), /* Put i/f in active state */
+	PORT_CMD_ICC_PARTIAL	= (0x2 << 28), /* Put i/f in partial state */
+	PORT_CMD_ICC_SLUMBER	= (0x6 << 28), /* Put i/f in slumber state */
+
+	/* hpriv->flags bits */
+	AHCI_FLAG_MSI		= (1 << 0),
+
+	/* ap->flags bits */
+	AHCI_FLAG_RESET_NEEDS_CLO	= (1 << 24),
+	AHCI_FLAG_NO_NCQ		= (1 << 25),
+};
+
+struct ahci_cmd_hdr {
+	u32			opts;
+	u32			status;
+	u32			tbl_addr;
+	u32			tbl_addr_hi;
+	u32			reserved[4];
+};
+
+struct ahci_sg {
+	u32			addr;
+	u32			addr_hi;
+	u32			reserved;
+	u32			flags_size;
+};
+
+struct ahci_host_priv {
+	unsigned long		flags;
+	u32			cap;	/* cache of HOST_CAP register */
+	u32			port_map; /* cache of HOST_PORTS_IMPL reg */
+};
+
+struct ahci_port_priv {
+	struct ahci_cmd_hdr	*cmd_slot;
+	dma_addr_t		cmd_slot_dma;
+	void			*cmd_tbl;
+	dma_addr_t		cmd_tbl_dma;
+	void			*rx_fis;
+	dma_addr_t		rx_fis_dma;
+};
+
+static u32 ahci_scr_read (struct ata_port *ap, unsigned int sc_reg);
+static void ahci_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val);
+static int ahci_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
+static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc);
+static irqreturn_t ahci_interrupt (int irq, void *dev_instance, struct pt_regs *regs);
+static void ahci_irq_clear(struct ata_port *ap);
+static int ahci_port_start(struct ata_port *ap);
+static void ahci_port_stop(struct ata_port *ap);
+static void ahci_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
+static void ahci_qc_prep(struct ata_queued_cmd *qc);
+static u8 ahci_check_status(struct ata_port *ap);
+static void ahci_freeze(struct ata_port *ap);
+static void ahci_thaw(struct ata_port *ap);
+static void ahci_error_handler(struct ata_port *ap);
+static void ahci_post_internal_cmd(struct ata_queued_cmd *qc);
+static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg);
+static int ahci_port_resume(struct ata_port *ap);
+static int ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
+static int ahci_pci_device_resume(struct pci_dev *pdev);
+static void ahci_remove_one (struct pci_dev *pdev);
+
+static struct scsi_host_template ahci_sht = {
+	.module			= THIS_MODULE,
+	.name			= DRV_NAME,
+	.ioctl			= ata_scsi_ioctl,
+	.queuecommand		= ata_scsi_queuecmd,
+	.change_queue_depth	= ata_scsi_change_queue_depth,
+	.can_queue		= AHCI_MAX_CMDS - 1,
+	.this_id		= ATA_SHT_THIS_ID,
+	.sg_tablesize		= AHCI_MAX_SG,
+	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
+	.emulated		= ATA_SHT_EMULATED,
+	.use_clustering		= AHCI_USE_CLUSTERING,
+	.proc_name		= DRV_NAME,
+	.dma_boundary		= AHCI_DMA_BOUNDARY,
+	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
+	.bios_param		= ata_std_bios_param,
+	.suspend		= ata_scsi_device_suspend,
+	.resume			= ata_scsi_device_resume,
+};
+
+static const struct ata_port_operations ahci_ops = {
+	.port_disable		= ata_port_disable,
+
+	.check_status		= ahci_check_status,
+	.check_altstatus	= ahci_check_status,
+	.dev_select		= ata_noop_dev_select,
+
+	.tf_read		= ahci_tf_read,
+
+	.qc_prep		= ahci_qc_prep,
+	.qc_issue		= ahci_qc_issue,
+
+	.irq_handler		= ahci_interrupt,
+	.irq_clear		= ahci_irq_clear,
+
+	.scr_read		= ahci_scr_read,
+	.scr_write		= ahci_scr_write,
+
+	.freeze			= ahci_freeze,
+	.thaw			= ahci_thaw,
+
+	.error_handler		= ahci_error_handler,
+	.post_internal_cmd	= ahci_post_internal_cmd,
+
+	.port_suspend		= ahci_port_suspend,
+	.port_resume		= ahci_port_resume,
+
+	.port_start		= ahci_port_start,
+	.port_stop		= ahci_port_stop,
+};
+
+static const struct ata_port_info ahci_port_info[] = {
+	/* board_ahci */
+	{
+		.sht		= &ahci_sht,
+		.host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+				  ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
+				  ATA_FLAG_SKIP_D2H_BSY,
+		.pio_mask	= 0x1f, /* pio0-4 */
+		.udma_mask	= 0x7f, /* udma0-6 ; FIXME */
+		.port_ops	= &ahci_ops,
+	},
+	/* board_ahci_vt8251 */
+	{
+		.sht		= &ahci_sht,
+		.host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+				  ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
+				  ATA_FLAG_SKIP_D2H_BSY |
+				  AHCI_FLAG_RESET_NEEDS_CLO | AHCI_FLAG_NO_NCQ,
+		.pio_mask	= 0x1f, /* pio0-4 */
+		.udma_mask	= 0x7f, /* udma0-6 ; FIXME */
+		.port_ops	= &ahci_ops,
+	},
+};
+
+static const struct pci_device_id ahci_pci_tbl[] = {
+	/* Intel */
+	{ PCI_VENDOR_ID_INTEL, 0x2652, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* ICH6 */
+	{ PCI_VENDOR_ID_INTEL, 0x2653, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* ICH6M */
+	{ PCI_VENDOR_ID_INTEL, 0x27c1, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* ICH7 */
+	{ PCI_VENDOR_ID_INTEL, 0x27c5, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* ICH7M */
+	{ PCI_VENDOR_ID_INTEL, 0x27c3, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* ICH7R */
+	{ PCI_VENDOR_ID_AL, 0x5288, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* ULi M5288 */
+	{ PCI_VENDOR_ID_INTEL, 0x2681, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* ESB2 */
+	{ PCI_VENDOR_ID_INTEL, 0x2682, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* ESB2 */
+	{ PCI_VENDOR_ID_INTEL, 0x2683, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* ESB2 */
+	{ PCI_VENDOR_ID_INTEL, 0x27c6, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* ICH7-M DH */
+	{ PCI_VENDOR_ID_INTEL, 0x2821, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* ICH8 */
+	{ PCI_VENDOR_ID_INTEL, 0x2822, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* ICH8 */
+	{ PCI_VENDOR_ID_INTEL, 0x2824, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* ICH8 */
+	{ PCI_VENDOR_ID_INTEL, 0x2829, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* ICH8M */
+	{ PCI_VENDOR_ID_INTEL, 0x282a, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* ICH8M */
+
+	/* JMicron */
+	{ 0x197b, 0x2360, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* JMicron JMB360 */
+	{ 0x197b, 0x2361, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* JMicron JMB361 */
+	{ 0x197b, 0x2363, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* JMicron JMB363 */
+	{ 0x197b, 0x2365, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* JMicron JMB365 */
+	{ 0x197b, 0x2366, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* JMicron JMB366 */
+
+	/* ATI */
+	{ PCI_VENDOR_ID_ATI, 0x4380, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* ATI SB600 non-raid */
+	{ PCI_VENDOR_ID_ATI, 0x4381, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* ATI SB600 raid */
+
+	/* VIA */
+	{ PCI_VENDOR_ID_VIA, 0x3349, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci_vt8251 }, /* VIA VT8251 */
+
+	/* NVIDIA */
+	{ PCI_VENDOR_ID_NVIDIA, 0x044c, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci },		/* MCP65 */
+	{ PCI_VENDOR_ID_NVIDIA, 0x044d, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci },		/* MCP65 */
+	{ PCI_VENDOR_ID_NVIDIA, 0x044e, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci },		/* MCP65 */
+	{ PCI_VENDOR_ID_NVIDIA, 0x044f, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci },		/* MCP65 */
+
+	/* SiS */
+	{ PCI_VENDOR_ID_SI, 0x1184, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* SiS 966 */
+	{ PCI_VENDOR_ID_SI, 0x1185, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* SiS 966 */
+	{ PCI_VENDOR_ID_SI, 0x0186, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_ahci }, /* SiS 968 */
+
+	{ }	/* terminate list */
+};
+
+
+static struct pci_driver ahci_pci_driver = {
+	.name			= DRV_NAME,
+	.id_table		= ahci_pci_tbl,
+	.probe			= ahci_init_one,
+	.suspend		= ahci_pci_device_suspend,
+	.resume			= ahci_pci_device_resume,
+	.remove			= ahci_remove_one,
+};
+
+
+static inline unsigned long ahci_port_base_ul (unsigned long base, unsigned int port)
+{
+	return base + 0x100 + (port * 0x80);
+}
+
+static inline void __iomem *ahci_port_base (void __iomem *base, unsigned int port)
+{
+	return (void __iomem *) ahci_port_base_ul((unsigned long)base, port);
+}
+
+static u32 ahci_scr_read (struct ata_port *ap, unsigned int sc_reg_in)
+{
+	unsigned int sc_reg;
+
+	switch (sc_reg_in) {
+	case SCR_STATUS:	sc_reg = 0; break;
+	case SCR_CONTROL:	sc_reg = 1; break;
+	case SCR_ERROR:		sc_reg = 2; break;
+	case SCR_ACTIVE:	sc_reg = 3; break;
+	default:
+		return 0xffffffffU;
+	}
+
+	return readl((void __iomem *) ap->ioaddr.scr_addr + (sc_reg * 4));
+}
+
+
+static void ahci_scr_write (struct ata_port *ap, unsigned int sc_reg_in,
+			       u32 val)
+{
+	unsigned int sc_reg;
+
+	switch (sc_reg_in) {
+	case SCR_STATUS:	sc_reg = 0; break;
+	case SCR_CONTROL:	sc_reg = 1; break;
+	case SCR_ERROR:		sc_reg = 2; break;
+	case SCR_ACTIVE:	sc_reg = 3; break;
+	default:
+		return;
+	}
+
+	writel(val, (void __iomem *) ap->ioaddr.scr_addr + (sc_reg * 4));
+}
+
+static void ahci_start_engine(void __iomem *port_mmio)
+{
+	u32 tmp;
+
+	/* start DMA */
+	tmp = readl(port_mmio + PORT_CMD);
+	tmp |= PORT_CMD_START;
+	writel(tmp, port_mmio + PORT_CMD);
+	readl(port_mmio + PORT_CMD); /* flush */
+}
+
+static int ahci_stop_engine(void __iomem *port_mmio)
+{
+	u32 tmp;
+
+	tmp = readl(port_mmio + PORT_CMD);
+
+	/* check if the HBA is idle */
+	if ((tmp & (PORT_CMD_START | PORT_CMD_LIST_ON)) == 0)
+		return 0;
+
+	/* setting HBA to idle */
+	tmp &= ~PORT_CMD_START;
+	writel(tmp, port_mmio + PORT_CMD);
+
+	/* wait for engine to stop. This could be as long as 500 msec */
+	tmp = ata_wait_register(port_mmio + PORT_CMD,
+			        PORT_CMD_LIST_ON, PORT_CMD_LIST_ON, 1, 500);
+	if (tmp & PORT_CMD_LIST_ON)
+		return -EIO;
+
+	return 0;
+}
+
+static void ahci_start_fis_rx(void __iomem *port_mmio, u32 cap,
+			      dma_addr_t cmd_slot_dma, dma_addr_t rx_fis_dma)
+{
+	u32 tmp;
+
+	/* set FIS registers */
+	if (cap & HOST_CAP_64)
+		writel((cmd_slot_dma >> 16) >> 16, port_mmio + PORT_LST_ADDR_HI);
+	writel(cmd_slot_dma & 0xffffffff, port_mmio + PORT_LST_ADDR);
+
+	if (cap & HOST_CAP_64)
+		writel((rx_fis_dma >> 16) >> 16, port_mmio + PORT_FIS_ADDR_HI);
+	writel(rx_fis_dma & 0xffffffff, port_mmio + PORT_FIS_ADDR);
+
+	/* enable FIS reception */
+	tmp = readl(port_mmio + PORT_CMD);
+	tmp |= PORT_CMD_FIS_RX;
+	writel(tmp, port_mmio + PORT_CMD);
+
+	/* flush */
+	readl(port_mmio + PORT_CMD);
+}
+
+static int ahci_stop_fis_rx(void __iomem *port_mmio)
+{
+	u32 tmp;
+
+	/* disable FIS reception */
+	tmp = readl(port_mmio + PORT_CMD);
+	tmp &= ~PORT_CMD_FIS_RX;
+	writel(tmp, port_mmio + PORT_CMD);
+
+	/* wait for completion, spec says 500ms, give it 1000 */
+	tmp = ata_wait_register(port_mmio + PORT_CMD, PORT_CMD_FIS_ON,
+				PORT_CMD_FIS_ON, 10, 1000);
+	if (tmp & PORT_CMD_FIS_ON)
+		return -EBUSY;
+
+	return 0;
+}
+
+static void ahci_power_up(void __iomem *port_mmio, u32 cap)
+{
+	u32 cmd;
+
+	cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
+
+	/* spin up device */
+	if (cap & HOST_CAP_SSS) {
+		cmd |= PORT_CMD_SPIN_UP;
+		writel(cmd, port_mmio + PORT_CMD);
+	}
+
+	/* wake up link */
+	writel(cmd | PORT_CMD_ICC_ACTIVE, port_mmio + PORT_CMD);
+}
+
+static void ahci_power_down(void __iomem *port_mmio, u32 cap)
+{
+	u32 cmd, scontrol;
+
+	cmd = readl(port_mmio + PORT_CMD) & ~PORT_CMD_ICC_MASK;
+
+	if (cap & HOST_CAP_SSC) {
+		/* enable transitions to slumber mode */
+		scontrol = readl(port_mmio + PORT_SCR_CTL);
+		if ((scontrol & 0x0f00) > 0x100) {
+			scontrol &= ~0xf00;
+			writel(scontrol, port_mmio + PORT_SCR_CTL);
+		}
+
+		/* put device into slumber mode */
+		writel(cmd | PORT_CMD_ICC_SLUMBER, port_mmio + PORT_CMD);
+
+		/* wait for the transition to complete */
+		ata_wait_register(port_mmio + PORT_CMD, PORT_CMD_ICC_SLUMBER,
+				  PORT_CMD_ICC_SLUMBER, 1, 50);
+	}
+
+	/* put device into listen mode */
+	if (cap & HOST_CAP_SSS) {
+		/* first set PxSCTL.DET to 0 */
+		scontrol = readl(port_mmio + PORT_SCR_CTL);
+		scontrol &= ~0xf;
+		writel(scontrol, port_mmio + PORT_SCR_CTL);
+
+		/* then set PxCMD.SUD to 0 */
+		cmd &= ~PORT_CMD_SPIN_UP;
+		writel(cmd, port_mmio + PORT_CMD);
+	}
+}
+
+static void ahci_init_port(void __iomem *port_mmio, u32 cap,
+			   dma_addr_t cmd_slot_dma, dma_addr_t rx_fis_dma)
+{
+	/* power up */
+	ahci_power_up(port_mmio, cap);
+
+	/* enable FIS reception */
+	ahci_start_fis_rx(port_mmio, cap, cmd_slot_dma, rx_fis_dma);
+
+	/* enable DMA */
+	ahci_start_engine(port_mmio);
+}
+
+static int ahci_deinit_port(void __iomem *port_mmio, u32 cap, const char **emsg)
+{
+	int rc;
+
+	/* disable DMA */
+	rc = ahci_stop_engine(port_mmio);
+	if (rc) {
+		*emsg = "failed to stop engine";
+		return rc;
+	}
+
+	/* disable FIS reception */
+	rc = ahci_stop_fis_rx(port_mmio);
+	if (rc) {
+		*emsg = "failed stop FIS RX";
+		return rc;
+	}
+
+	/* put device into slumber mode */
+	ahci_power_down(port_mmio, cap);
+
+	return 0;
+}
+
+static int ahci_reset_controller(void __iomem *mmio, struct pci_dev *pdev)
+{
+	u32 cap_save, tmp;
+
+	cap_save = readl(mmio + HOST_CAP);
+	cap_save &= ( (1<<28) | (1<<17) );
+	cap_save |= (1 << 27);
+
+	/* global controller reset */
+	tmp = readl(mmio + HOST_CTL);
+	if ((tmp & HOST_RESET) == 0) {
+		writel(tmp | HOST_RESET, mmio + HOST_CTL);
+		readl(mmio + HOST_CTL); /* flush */
+	}
+
+	/* reset must complete within 1 second, or
+	 * the hardware should be considered fried.
+	 */
+	ssleep(1);
+
+	tmp = readl(mmio + HOST_CTL);
+	if (tmp & HOST_RESET) {
+		dev_printk(KERN_ERR, &pdev->dev,
+			   "controller reset failed (0x%x)\n", tmp);
+		return -EIO;
+	}
+
+	writel(HOST_AHCI_EN, mmio + HOST_CTL);
+	(void) readl(mmio + HOST_CTL);	/* flush */
+	writel(cap_save, mmio + HOST_CAP);
+	writel(0xf, mmio + HOST_PORTS_IMPL);
+	(void) readl(mmio + HOST_PORTS_IMPL);	/* flush */
+
+	if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
+		u16 tmp16;
+
+		/* configure PCS */
+		pci_read_config_word(pdev, 0x92, &tmp16);
+		tmp16 |= 0xf;
+		pci_write_config_word(pdev, 0x92, tmp16);
+	}
+
+	return 0;
+}
+
+static void ahci_init_controller(void __iomem *mmio, struct pci_dev *pdev,
+				 int n_ports, u32 cap)
+{
+	int i, rc;
+	u32 tmp;
+
+	for (i = 0; i < n_ports; i++) {
+		void __iomem *port_mmio = ahci_port_base(mmio, i);
+		const char *emsg = NULL;
+
+#if 0 /* BIOSen initialize this incorrectly */
+		if (!(hpriv->port_map & (1 << i)))
+			continue;
+#endif
+
+		/* make sure port is not active */
+		rc = ahci_deinit_port(port_mmio, cap, &emsg);
+		if (rc)
+			dev_printk(KERN_WARNING, &pdev->dev,
+				   "%s (%d)\n", emsg, rc);
+
+		/* clear SError */
+		tmp = readl(port_mmio + PORT_SCR_ERR);
+		VPRINTK("PORT_SCR_ERR 0x%x\n", tmp);
+		writel(tmp, port_mmio + PORT_SCR_ERR);
+
+		/* clear port IRQ */
+		tmp = readl(port_mmio + PORT_IRQ_STAT);
+		VPRINTK("PORT_IRQ_STAT 0x%x\n", tmp);
+		if (tmp)
+			writel(tmp, port_mmio + PORT_IRQ_STAT);
+
+		writel(1 << i, mmio + HOST_IRQ_STAT);
+	}
+
+	tmp = readl(mmio + HOST_CTL);
+	VPRINTK("HOST_CTL 0x%x\n", tmp);
+	writel(tmp | HOST_IRQ_EN, mmio + HOST_CTL);
+	tmp = readl(mmio + HOST_CTL);
+	VPRINTK("HOST_CTL 0x%x\n", tmp);
+}
+
+static unsigned int ahci_dev_classify(struct ata_port *ap)
+{
+	void __iomem *port_mmio = (void __iomem *) ap->ioaddr.cmd_addr;
+	struct ata_taskfile tf;
+	u32 tmp;
+
+	tmp = readl(port_mmio + PORT_SIG);
+	tf.lbah		= (tmp >> 24)	& 0xff;
+	tf.lbam		= (tmp >> 16)	& 0xff;
+	tf.lbal		= (tmp >> 8)	& 0xff;
+	tf.nsect	= (tmp)		& 0xff;
+
+	return ata_dev_classify(&tf);
+}
+
+static void ahci_fill_cmd_slot(struct ahci_port_priv *pp, unsigned int tag,
+			       u32 opts)
+{
+	dma_addr_t cmd_tbl_dma;
+
+	cmd_tbl_dma = pp->cmd_tbl_dma + tag * AHCI_CMD_TBL_SZ;
+
+	pp->cmd_slot[tag].opts = cpu_to_le32(opts);
+	pp->cmd_slot[tag].status = 0;
+	pp->cmd_slot[tag].tbl_addr = cpu_to_le32(cmd_tbl_dma & 0xffffffff);
+	pp->cmd_slot[tag].tbl_addr_hi = cpu_to_le32((cmd_tbl_dma >> 16) >> 16);
+}
+
+static int ahci_clo(struct ata_port *ap)
+{
+	void __iomem *port_mmio = (void __iomem *) ap->ioaddr.cmd_addr;
+	struct ahci_host_priv *hpriv = ap->host_set->private_data;
+	u32 tmp;
+
+	if (!(hpriv->cap & HOST_CAP_CLO))
+		return -EOPNOTSUPP;
+
+	tmp = readl(port_mmio + PORT_CMD);
+	tmp |= PORT_CMD_CLO;
+	writel(tmp, port_mmio + PORT_CMD);
+
+	tmp = ata_wait_register(port_mmio + PORT_CMD,
+				PORT_CMD_CLO, PORT_CMD_CLO, 1, 500);
+	if (tmp & PORT_CMD_CLO)
+		return -EIO;
+
+	return 0;
+}
+
+static int ahci_prereset(struct ata_port *ap)
+{
+	if ((ap->flags & AHCI_FLAG_RESET_NEEDS_CLO) &&
+	    (ata_busy_wait(ap, ATA_BUSY, 1000) & ATA_BUSY)) {
+		/* ATA_BUSY hasn't cleared, so send a CLO */
+		ahci_clo(ap);
+	}
+
+	return ata_std_prereset(ap);
+}
+
+static int ahci_softreset(struct ata_port *ap, unsigned int *class)
+{
+	struct ahci_port_priv *pp = ap->private_data;
+	void __iomem *mmio = ap->host_set->mmio_base;
+	void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
+	const u32 cmd_fis_len = 5; /* five dwords */
+	const char *reason = NULL;
+	struct ata_taskfile tf;
+	u32 tmp;
+	u8 *fis;
+	int rc;
+
+	DPRINTK("ENTER\n");
+
+	if (ata_port_offline(ap)) {
+		DPRINTK("PHY reports no device\n");
+		*class = ATA_DEV_NONE;
+		return 0;
+	}
+
+	/* prepare for SRST (AHCI-1.1 10.4.1) */
+	rc = ahci_stop_engine(port_mmio);
+	if (rc) {
+		reason = "failed to stop engine";
+		goto fail_restart;
+	}
+
+	/* check BUSY/DRQ, perform Command List Override if necessary */
+	ahci_tf_read(ap, &tf);
+	if (tf.command & (ATA_BUSY | ATA_DRQ)) {
+		rc = ahci_clo(ap);
+
+		if (rc == -EOPNOTSUPP) {
+			reason = "port busy but CLO unavailable";
+			goto fail_restart;
+		} else if (rc) {
+			reason = "port busy but CLO failed";
+			goto fail_restart;
+		}
+	}
+
+	/* restart engine */
+	ahci_start_engine(port_mmio);
+
+	ata_tf_init(ap->device, &tf);
+	fis = pp->cmd_tbl;
+
+	/* issue the first D2H Register FIS */
+	ahci_fill_cmd_slot(pp, 0,
+			   cmd_fis_len | AHCI_CMD_RESET | AHCI_CMD_CLR_BUSY);
+
+	tf.ctl |= ATA_SRST;
+	ata_tf_to_fis(&tf, fis, 0);
+	fis[1] &= ~(1 << 7);	/* turn off Command FIS bit */
+
+	writel(1, port_mmio + PORT_CMD_ISSUE);
+
+	tmp = ata_wait_register(port_mmio + PORT_CMD_ISSUE, 0x1, 0x1, 1, 500);
+	if (tmp & 0x1) {
+		rc = -EIO;
+		reason = "1st FIS failed";
+		goto fail;
+	}
+
+	/* spec says at least 5us, but be generous and sleep for 1ms */
+	msleep(1);
+
+	/* issue the second D2H Register FIS */
+	ahci_fill_cmd_slot(pp, 0, cmd_fis_len);
+
+	tf.ctl &= ~ATA_SRST;
+	ata_tf_to_fis(&tf, fis, 0);
+	fis[1] &= ~(1 << 7);	/* turn off Command FIS bit */
+
+	writel(1, port_mmio + PORT_CMD_ISSUE);
+	readl(port_mmio + PORT_CMD_ISSUE);	/* flush */
+
+	/* spec mandates ">= 2ms" before checking status.
+	 * We wait 150ms, because that was the magic delay used for
+	 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
+	 * between when the ATA command register is written, and then
+	 * status is checked.  Because waiting for "a while" before
+	 * checking status is fine, post SRST, we perform this magic
+	 * delay here as well.
+	 */
+	msleep(150);
+
+	*class = ATA_DEV_NONE;
+	if (ata_port_online(ap)) {
+		if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
+			rc = -EIO;
+			reason = "device not ready";
+			goto fail;
+		}
+		*class = ahci_dev_classify(ap);
+	}
+
+	DPRINTK("EXIT, class=%u\n", *class);
+	return 0;
+
+ fail_restart:
+	ahci_start_engine(port_mmio);
+ fail:
+	ata_port_printk(ap, KERN_ERR, "softreset failed (%s)\n", reason);
+	return rc;
+}
+
+static int ahci_hardreset(struct ata_port *ap, unsigned int *class)
+{
+	struct ahci_port_priv *pp = ap->private_data;
+	u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
+	struct ata_taskfile tf;
+	void __iomem *mmio = ap->host_set->mmio_base;
+	void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
+	int rc;
+
+	DPRINTK("ENTER\n");
+
+	ahci_stop_engine(port_mmio);
+
+	/* clear D2H reception area to properly wait for D2H FIS */
+	ata_tf_init(ap->device, &tf);
+	tf.command = 0xff;
+	ata_tf_to_fis(&tf, d2h_fis, 0);
+
+	rc = sata_std_hardreset(ap, class);
+
+	ahci_start_engine(port_mmio);
+
+	if (rc == 0 && ata_port_online(ap))
+		*class = ahci_dev_classify(ap);
+	if (*class == ATA_DEV_UNKNOWN)
+		*class = ATA_DEV_NONE;
+
+	DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
+	return rc;
+}
+
+static void ahci_postreset(struct ata_port *ap, unsigned int *class)
+{
+	void __iomem *port_mmio = (void __iomem *) ap->ioaddr.cmd_addr;
+	u32 new_tmp, tmp;
+
+	ata_std_postreset(ap, class);
+
+	/* Make sure port's ATAPI bit is set appropriately */
+	new_tmp = tmp = readl(port_mmio + PORT_CMD);
+	if (*class == ATA_DEV_ATAPI)
+		new_tmp |= PORT_CMD_ATAPI;
+	else
+		new_tmp &= ~PORT_CMD_ATAPI;
+	if (new_tmp != tmp) {
+		writel(new_tmp, port_mmio + PORT_CMD);
+		readl(port_mmio + PORT_CMD); /* flush */
+	}
+}
+
+static u8 ahci_check_status(struct ata_port *ap)
+{
+	void __iomem *mmio = (void __iomem *) ap->ioaddr.cmd_addr;
+
+	return readl(mmio + PORT_TFDATA) & 0xFF;
+}
+
+static void ahci_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
+{
+	struct ahci_port_priv *pp = ap->private_data;
+	u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
+
+	ata_tf_from_fis(d2h_fis, tf);
+}
+
+static unsigned int ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
+{
+	struct scatterlist *sg;
+	struct ahci_sg *ahci_sg;
+	unsigned int n_sg = 0;
+
+	VPRINTK("ENTER\n");
+
+	/*
+	 * Next, the S/G list.
+	 */
+	ahci_sg = cmd_tbl + AHCI_CMD_TBL_HDR_SZ;
+	ata_for_each_sg(sg, qc) {
+		dma_addr_t addr = sg_dma_address(sg);
+		u32 sg_len = sg_dma_len(sg);
+
+		ahci_sg->addr = cpu_to_le32(addr & 0xffffffff);
+		ahci_sg->addr_hi = cpu_to_le32((addr >> 16) >> 16);
+		ahci_sg->flags_size = cpu_to_le32(sg_len - 1);
+
+		ahci_sg++;
+		n_sg++;
+	}
+
+	return n_sg;
+}
+
+static void ahci_qc_prep(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct ahci_port_priv *pp = ap->private_data;
+	int is_atapi = is_atapi_taskfile(&qc->tf);
+	void *cmd_tbl;
+	u32 opts;
+	const u32 cmd_fis_len = 5; /* five dwords */
+	unsigned int n_elem;
+
+	/*
+	 * Fill in command table information.  First, the header,
+	 * a SATA Register - Host to Device command FIS.
+	 */
+	cmd_tbl = pp->cmd_tbl + qc->tag * AHCI_CMD_TBL_SZ;
+
+	ata_tf_to_fis(&qc->tf, cmd_tbl, 0);
+	if (is_atapi) {
+		memset(cmd_tbl + AHCI_CMD_TBL_CDB, 0, 32);
+		memcpy(cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb, qc->dev->cdb_len);
+	}
+
+	n_elem = 0;
+	if (qc->flags & ATA_QCFLAG_DMAMAP)
+		n_elem = ahci_fill_sg(qc, cmd_tbl);
+
+	/*
+	 * Fill in command slot information.
+	 */
+	opts = cmd_fis_len | n_elem << 16;
+	if (qc->tf.flags & ATA_TFLAG_WRITE)
+		opts |= AHCI_CMD_WRITE;
+	if (is_atapi)
+		opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH;
+
+	ahci_fill_cmd_slot(pp, qc->tag, opts);
+}
+
+static void ahci_error_intr(struct ata_port *ap, u32 irq_stat)
+{
+	struct ahci_port_priv *pp = ap->private_data;
+	struct ata_eh_info *ehi = &ap->eh_info;
+	unsigned int err_mask = 0, action = 0;
+	struct ata_queued_cmd *qc;
+	u32 serror;
+
+	ata_ehi_clear_desc(ehi);
+
+	/* AHCI needs SError cleared; otherwise, it might lock up */
+	serror = ahci_scr_read(ap, SCR_ERROR);
+	ahci_scr_write(ap, SCR_ERROR, serror);
+
+	/* analyze @irq_stat */
+	ata_ehi_push_desc(ehi, "irq_stat 0x%08x", irq_stat);
+
+	if (irq_stat & PORT_IRQ_TF_ERR)
+		err_mask |= AC_ERR_DEV;
+
+	if (irq_stat & (PORT_IRQ_HBUS_ERR | PORT_IRQ_HBUS_DATA_ERR)) {
+		err_mask |= AC_ERR_HOST_BUS;
+		action |= ATA_EH_SOFTRESET;
+	}
+
+	if (irq_stat & PORT_IRQ_IF_ERR) {
+		err_mask |= AC_ERR_ATA_BUS;
+		action |= ATA_EH_SOFTRESET;
+		ata_ehi_push_desc(ehi, ", interface fatal error");
+	}
+
+	if (irq_stat & (PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)) {
+		ata_ehi_hotplugged(ehi);
+		ata_ehi_push_desc(ehi, ", %s", irq_stat & PORT_IRQ_CONNECT ?
+			"connection status changed" : "PHY RDY changed");
+	}
+
+	if (irq_stat & PORT_IRQ_UNK_FIS) {
+		u32 *unk = (u32 *)(pp->rx_fis + RX_FIS_UNK);
+
+		err_mask |= AC_ERR_HSM;
+		action |= ATA_EH_SOFTRESET;
+		ata_ehi_push_desc(ehi, ", unknown FIS %08x %08x %08x %08x",
+				  unk[0], unk[1], unk[2], unk[3]);
+	}
+
+	/* okay, let's hand over to EH */
+	ehi->serror |= serror;
+	ehi->action |= action;
+
+	qc = ata_qc_from_tag(ap, ap->active_tag);
+	if (qc)
+		qc->err_mask |= err_mask;
+	else
+		ehi->err_mask |= err_mask;
+
+	if (irq_stat & PORT_IRQ_FREEZE)
+		ata_port_freeze(ap);
+	else
+		ata_port_abort(ap);
+}
+
+static void ahci_host_intr(struct ata_port *ap)
+{
+	void __iomem *mmio = ap->host_set->mmio_base;
+	void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
+	struct ata_eh_info *ehi = &ap->eh_info;
+	u32 status, qc_active;
+	int rc;
+
+	status = readl(port_mmio + PORT_IRQ_STAT);
+	writel(status, port_mmio + PORT_IRQ_STAT);
+
+	if (unlikely(status & PORT_IRQ_ERROR)) {
+		ahci_error_intr(ap, status);
+		return;
+	}
+
+	if (ap->sactive)
+		qc_active = readl(port_mmio + PORT_SCR_ACT);
+	else
+		qc_active = readl(port_mmio + PORT_CMD_ISSUE);
+
+	rc = ata_qc_complete_multiple(ap, qc_active, NULL);
+	if (rc > 0)
+		return;
+	if (rc < 0) {
+		ehi->err_mask |= AC_ERR_HSM;
+		ehi->action |= ATA_EH_SOFTRESET;
+		ata_port_freeze(ap);
+		return;
+	}
+
+	/* hmmm... a spurious interupt */
+
+	/* some devices send D2H reg with I bit set during NCQ command phase */
+	if (ap->sactive && status & PORT_IRQ_D2H_REG_FIS)
+		return;
+
+	/* ignore interim PIO setup fis interrupts */
+	if (ata_tag_valid(ap->active_tag) && (status & PORT_IRQ_PIOS_FIS)) 
+		return;
+
+	if (ata_ratelimit())
+		ata_port_printk(ap, KERN_INFO, "spurious interrupt "
+				"(irq_stat 0x%x active_tag %d sactive 0x%x)\n",
+				status, ap->active_tag, ap->sactive);
+}
+
+static void ahci_irq_clear(struct ata_port *ap)
+{
+	/* TODO */
+}
+
+static irqreturn_t ahci_interrupt(int irq, void *dev_instance, struct pt_regs *regs)
+{
+	struct ata_host_set *host_set = dev_instance;
+	struct ahci_host_priv *hpriv;
+	unsigned int i, handled = 0;
+	void __iomem *mmio;
+	u32 irq_stat, irq_ack = 0;
+
+	VPRINTK("ENTER\n");
+
+	hpriv = host_set->private_data;
+	mmio = host_set->mmio_base;
+
+	/* sigh.  0xffffffff is a valid return from h/w */
+	irq_stat = readl(mmio + HOST_IRQ_STAT);
+	irq_stat &= hpriv->port_map;
+	if (!irq_stat)
+		return IRQ_NONE;
+
+        spin_lock(&host_set->lock);
+
+        for (i = 0; i < host_set->n_ports; i++) {
+		struct ata_port *ap;
+
+		if (!(irq_stat & (1 << i)))
+			continue;
+
+		ap = host_set->ports[i];
+		if (ap) {
+			ahci_host_intr(ap);
+			VPRINTK("port %u\n", i);
+		} else {
+			VPRINTK("port %u (no irq)\n", i);
+			if (ata_ratelimit())
+				dev_printk(KERN_WARNING, host_set->dev,
+					"interrupt on disabled port %u\n", i);
+		}
+
+		irq_ack |= (1 << i);
+	}
+
+	if (irq_ack) {
+		writel(irq_ack, mmio + HOST_IRQ_STAT);
+		handled = 1;
+	}
+
+	spin_unlock(&host_set->lock);
+
+	VPRINTK("EXIT\n");
+
+	return IRQ_RETVAL(handled);
+}
+
+static unsigned int ahci_qc_issue(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	void __iomem *port_mmio = (void __iomem *) ap->ioaddr.cmd_addr;
+
+	if (qc->tf.protocol == ATA_PROT_NCQ)
+		writel(1 << qc->tag, port_mmio + PORT_SCR_ACT);
+	writel(1 << qc->tag, port_mmio + PORT_CMD_ISSUE);
+	readl(port_mmio + PORT_CMD_ISSUE);	/* flush */
+
+	return 0;
+}
+
+static void ahci_freeze(struct ata_port *ap)
+{
+	void __iomem *mmio = ap->host_set->mmio_base;
+	void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
+
+	/* turn IRQ off */
+	writel(0, port_mmio + PORT_IRQ_MASK);
+}
+
+static void ahci_thaw(struct ata_port *ap)
+{
+	void __iomem *mmio = ap->host_set->mmio_base;
+	void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
+	u32 tmp;
+
+	/* clear IRQ */
+	tmp = readl(port_mmio + PORT_IRQ_STAT);
+	writel(tmp, port_mmio + PORT_IRQ_STAT);
+	writel(1 << ap->id, mmio + HOST_IRQ_STAT);
+
+	/* turn IRQ back on */
+	writel(DEF_PORT_IRQ, port_mmio + PORT_IRQ_MASK);
+}
+
+static void ahci_error_handler(struct ata_port *ap)
+{
+	void __iomem *mmio = ap->host_set->mmio_base;
+	void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
+
+	if (!(ap->pflags & ATA_PFLAG_FROZEN)) {
+		/* restart engine */
+		ahci_stop_engine(port_mmio);
+		ahci_start_engine(port_mmio);
+	}
+
+	/* perform recovery */
+	ata_do_eh(ap, ahci_prereset, ahci_softreset, ahci_hardreset,
+		  ahci_postreset);
+}
+
+static void ahci_post_internal_cmd(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	void __iomem *mmio = ap->host_set->mmio_base;
+	void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
+
+	if (qc->flags & ATA_QCFLAG_FAILED)
+		qc->err_mask |= AC_ERR_OTHER;
+
+	if (qc->err_mask) {
+		/* make DMA engine forget about the failed command */
+		ahci_stop_engine(port_mmio);
+		ahci_start_engine(port_mmio);
+	}
+}
+
+static int ahci_port_suspend(struct ata_port *ap, pm_message_t mesg)
+{
+	struct ahci_host_priv *hpriv = ap->host_set->private_data;
+	struct ahci_port_priv *pp = ap->private_data;
+	void __iomem *mmio = ap->host_set->mmio_base;
+	void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
+	const char *emsg = NULL;
+	int rc;
+
+	rc = ahci_deinit_port(port_mmio, hpriv->cap, &emsg);
+	if (rc) {
+		ata_port_printk(ap, KERN_ERR, "%s (%d)\n", emsg, rc);
+		ahci_init_port(port_mmio, hpriv->cap,
+			       pp->cmd_slot_dma, pp->rx_fis_dma);
+	}
+
+	return rc;
+}
+
+static int ahci_port_resume(struct ata_port *ap)
+{
+	struct ahci_port_priv *pp = ap->private_data;
+	struct ahci_host_priv *hpriv = ap->host_set->private_data;
+	void __iomem *mmio = ap->host_set->mmio_base;
+	void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
+
+	ahci_init_port(port_mmio, hpriv->cap, pp->cmd_slot_dma, pp->rx_fis_dma);
+
+	return 0;
+}
+
+static int ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
+{
+	struct ata_host_set *host_set = dev_get_drvdata(&pdev->dev);
+	void __iomem *mmio = host_set->mmio_base;
+	u32 ctl;
+
+	if (mesg.event == PM_EVENT_SUSPEND) {
+		/* AHCI spec rev1.1 section 8.3.3:
+		 * Software must disable interrupts prior to requesting a
+		 * transition of the HBA to D3 state.
+		 */
+		ctl = readl(mmio + HOST_CTL);
+		ctl &= ~HOST_IRQ_EN;
+		writel(ctl, mmio + HOST_CTL);
+		readl(mmio + HOST_CTL); /* flush */
+	}
+
+	return ata_pci_device_suspend(pdev, mesg);
+}
+
+static int ahci_pci_device_resume(struct pci_dev *pdev)
+{
+	struct ata_host_set *host_set = dev_get_drvdata(&pdev->dev);
+	struct ahci_host_priv *hpriv = host_set->private_data;
+	void __iomem *mmio = host_set->mmio_base;
+	int rc;
+
+	ata_pci_device_do_resume(pdev);
+
+	if (pdev->dev.power.power_state.event == PM_EVENT_SUSPEND) {
+		rc = ahci_reset_controller(mmio, pdev);
+		if (rc)
+			return rc;
+
+		ahci_init_controller(mmio, pdev, host_set->n_ports, hpriv->cap);
+	}
+
+	ata_host_set_resume(host_set);
+
+	return 0;
+}
+
+static int ahci_port_start(struct ata_port *ap)
+{
+	struct device *dev = ap->host_set->dev;
+	struct ahci_host_priv *hpriv = ap->host_set->private_data;
+	struct ahci_port_priv *pp;
+	void __iomem *mmio = ap->host_set->mmio_base;
+	void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
+	void *mem;
+	dma_addr_t mem_dma;
+	int rc;
+
+	pp = kmalloc(sizeof(*pp), GFP_KERNEL);
+	if (!pp)
+		return -ENOMEM;
+	memset(pp, 0, sizeof(*pp));
+
+	rc = ata_pad_alloc(ap, dev);
+	if (rc) {
+		kfree(pp);
+		return rc;
+	}
+
+	mem = dma_alloc_coherent(dev, AHCI_PORT_PRIV_DMA_SZ, &mem_dma, GFP_KERNEL);
+	if (!mem) {
+		ata_pad_free(ap, dev);
+		kfree(pp);
+		return -ENOMEM;
+	}
+	memset(mem, 0, AHCI_PORT_PRIV_DMA_SZ);
+
+	/*
+	 * First item in chunk of DMA memory: 32-slot command table,
+	 * 32 bytes each in size
+	 */
+	pp->cmd_slot = mem;
+	pp->cmd_slot_dma = mem_dma;
+
+	mem += AHCI_CMD_SLOT_SZ;
+	mem_dma += AHCI_CMD_SLOT_SZ;
+
+	/*
+	 * Second item: Received-FIS area
+	 */
+	pp->rx_fis = mem;
+	pp->rx_fis_dma = mem_dma;
+
+	mem += AHCI_RX_FIS_SZ;
+	mem_dma += AHCI_RX_FIS_SZ;
+
+	/*
+	 * Third item: data area for storing a single command
+	 * and its scatter-gather table
+	 */
+	pp->cmd_tbl = mem;
+	pp->cmd_tbl_dma = mem_dma;
+
+	ap->private_data = pp;
+
+	/* initialize port */
+	ahci_init_port(port_mmio, hpriv->cap, pp->cmd_slot_dma, pp->rx_fis_dma);
+
+	return 0;
+}
+
+static void ahci_port_stop(struct ata_port *ap)
+{
+	struct device *dev = ap->host_set->dev;
+	struct ahci_host_priv *hpriv = ap->host_set->private_data;
+	struct ahci_port_priv *pp = ap->private_data;
+	void __iomem *mmio = ap->host_set->mmio_base;
+	void __iomem *port_mmio = ahci_port_base(mmio, ap->port_no);
+	const char *emsg = NULL;
+	int rc;
+
+	/* de-initialize port */
+	rc = ahci_deinit_port(port_mmio, hpriv->cap, &emsg);
+	if (rc)
+		ata_port_printk(ap, KERN_WARNING, "%s (%d)\n", emsg, rc);
+
+	ap->private_data = NULL;
+	dma_free_coherent(dev, AHCI_PORT_PRIV_DMA_SZ,
+			  pp->cmd_slot, pp->cmd_slot_dma);
+	ata_pad_free(ap, dev);
+	kfree(pp);
+}
+
+static void ahci_setup_port(struct ata_ioports *port, unsigned long base,
+			    unsigned int port_idx)
+{
+	VPRINTK("ENTER, base==0x%lx, port_idx %u\n", base, port_idx);
+	base = ahci_port_base_ul(base, port_idx);
+	VPRINTK("base now==0x%lx\n", base);
+
+	port->cmd_addr		= base;
+	port->scr_addr		= base + PORT_SCR;
+
+	VPRINTK("EXIT\n");
+}
+
+static int ahci_host_init(struct ata_probe_ent *probe_ent)
+{
+	struct ahci_host_priv *hpriv = probe_ent->private_data;
+	struct pci_dev *pdev = to_pci_dev(probe_ent->dev);
+	void __iomem *mmio = probe_ent->mmio_base;
+	unsigned int i, using_dac;
+	int rc;
+
+	rc = ahci_reset_controller(mmio, pdev);
+	if (rc)
+		return rc;
+
+	hpriv->cap = readl(mmio + HOST_CAP);
+	hpriv->port_map = readl(mmio + HOST_PORTS_IMPL);
+	probe_ent->n_ports = (hpriv->cap & 0x1f) + 1;
+
+	VPRINTK("cap 0x%x  port_map 0x%x  n_ports %d\n",
+		hpriv->cap, hpriv->port_map, probe_ent->n_ports);
+
+	using_dac = hpriv->cap & HOST_CAP_64;
+	if (using_dac &&
+	    !pci_set_dma_mask(pdev, DMA_64BIT_MASK)) {
+		rc = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK);
+		if (rc) {
+			rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
+			if (rc) {
+				dev_printk(KERN_ERR, &pdev->dev,
+					   "64-bit DMA enable failed\n");
+				return rc;
+			}
+		}
+	} else {
+		rc = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
+		if (rc) {
+			dev_printk(KERN_ERR, &pdev->dev,
+				   "32-bit DMA enable failed\n");
+			return rc;
+		}
+		rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
+		if (rc) {
+			dev_printk(KERN_ERR, &pdev->dev,
+				   "32-bit consistent DMA enable failed\n");
+			return rc;
+		}
+	}
+
+	for (i = 0; i < probe_ent->n_ports; i++)
+		ahci_setup_port(&probe_ent->port[i], (unsigned long) mmio, i);
+
+	ahci_init_controller(mmio, pdev, probe_ent->n_ports, hpriv->cap);
+
+	pci_set_master(pdev);
+
+	return 0;
+}
+
+static void ahci_print_info(struct ata_probe_ent *probe_ent)
+{
+	struct ahci_host_priv *hpriv = probe_ent->private_data;
+	struct pci_dev *pdev = to_pci_dev(probe_ent->dev);
+	void __iomem *mmio = probe_ent->mmio_base;
+	u32 vers, cap, impl, speed;
+	const char *speed_s;
+	u16 cc;
+	const char *scc_s;
+
+	vers = readl(mmio + HOST_VERSION);
+	cap = hpriv->cap;
+	impl = hpriv->port_map;
+
+	speed = (cap >> 20) & 0xf;
+	if (speed == 1)
+		speed_s = "1.5";
+	else if (speed == 2)
+		speed_s = "3";
+	else
+		speed_s = "?";
+
+	pci_read_config_word(pdev, 0x0a, &cc);
+	if (cc == 0x0101)
+		scc_s = "IDE";
+	else if (cc == 0x0106)
+		scc_s = "SATA";
+	else if (cc == 0x0104)
+		scc_s = "RAID";
+	else
+		scc_s = "unknown";
+
+	dev_printk(KERN_INFO, &pdev->dev,
+		"AHCI %02x%02x.%02x%02x "
+		"%u slots %u ports %s Gbps 0x%x impl %s mode\n"
+	       	,
+
+	       	(vers >> 24) & 0xff,
+	       	(vers >> 16) & 0xff,
+	       	(vers >> 8) & 0xff,
+	       	vers & 0xff,
+
+		((cap >> 8) & 0x1f) + 1,
+		(cap & 0x1f) + 1,
+		speed_s,
+		impl,
+		scc_s);
+
+	dev_printk(KERN_INFO, &pdev->dev,
+		"flags: "
+	       	"%s%s%s%s%s%s"
+	       	"%s%s%s%s%s%s%s\n"
+	       	,
+
+		cap & (1 << 31) ? "64bit " : "",
+		cap & (1 << 30) ? "ncq " : "",
+		cap & (1 << 28) ? "ilck " : "",
+		cap & (1 << 27) ? "stag " : "",
+		cap & (1 << 26) ? "pm " : "",
+		cap & (1 << 25) ? "led " : "",
+
+		cap & (1 << 24) ? "clo " : "",
+		cap & (1 << 19) ? "nz " : "",
+		cap & (1 << 18) ? "only " : "",
+		cap & (1 << 17) ? "pmp " : "",
+		cap & (1 << 15) ? "pio " : "",
+		cap & (1 << 14) ? "slum " : "",
+		cap & (1 << 13) ? "part " : ""
+		);
+}
+
+static int ahci_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	static int printed_version;
+	struct ata_probe_ent *probe_ent = NULL;
+	struct ahci_host_priv *hpriv;
+	unsigned long base;
+	void __iomem *mmio_base;
+	unsigned int board_idx = (unsigned int) ent->driver_data;
+	int have_msi, pci_dev_busy = 0;
+	int rc;
+
+	VPRINTK("ENTER\n");
+
+	WARN_ON(ATA_MAX_QUEUE > AHCI_MAX_CMDS);
+
+	if (!printed_version++)
+		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
+
+	/* JMicron-specific fixup: make sure we're in AHCI mode */
+	/* This is protected from races with ata_jmicron by the pci probe
+	   locking */
+	if (pdev->vendor == PCI_VENDOR_ID_JMICRON) {
+		/* AHCI enable, AHCI on function 0 */
+		pci_write_config_byte(pdev, 0x41, 0xa1);
+		/* Function 1 is the PATA controller */
+		if (PCI_FUNC(pdev->devfn))
+			return -ENODEV;
+	}
+
+	rc = pci_enable_device(pdev);
+	if (rc)
+		return rc;
+
+	rc = pci_request_regions(pdev, DRV_NAME);
+	if (rc) {
+		pci_dev_busy = 1;
+		goto err_out;
+	}
+
+	if (pci_enable_msi(pdev) == 0)
+		have_msi = 1;
+	else {
+		pci_intx(pdev, 1);
+		have_msi = 0;
+	}
+
+	probe_ent = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
+	if (probe_ent == NULL) {
+		rc = -ENOMEM;
+		goto err_out_msi;
+	}
+
+	memset(probe_ent, 0, sizeof(*probe_ent));
+	probe_ent->dev = pci_dev_to_dev(pdev);
+	INIT_LIST_HEAD(&probe_ent->node);
+
+	mmio_base = pci_iomap(pdev, AHCI_PCI_BAR, 0);
+	if (mmio_base == NULL) {
+		rc = -ENOMEM;
+		goto err_out_free_ent;
+	}
+	base = (unsigned long) mmio_base;
+
+	hpriv = kmalloc(sizeof(*hpriv), GFP_KERNEL);
+	if (!hpriv) {
+		rc = -ENOMEM;
+		goto err_out_iounmap;
+	}
+	memset(hpriv, 0, sizeof(*hpriv));
+
+	probe_ent->sht		= ahci_port_info[board_idx].sht;
+	probe_ent->host_flags	= ahci_port_info[board_idx].host_flags;
+	probe_ent->pio_mask	= ahci_port_info[board_idx].pio_mask;
+	probe_ent->udma_mask	= ahci_port_info[board_idx].udma_mask;
+	probe_ent->port_ops	= ahci_port_info[board_idx].port_ops;
+
+       	probe_ent->irq = pdev->irq;
+       	probe_ent->irq_flags = IRQF_SHARED;
+	probe_ent->mmio_base = mmio_base;
+	probe_ent->private_data = hpriv;
+
+	if (have_msi)
+		hpriv->flags |= AHCI_FLAG_MSI;
+
+	/* initialize adapter */
+	rc = ahci_host_init(probe_ent);
+	if (rc)
+		goto err_out_hpriv;
+
+	if (!(probe_ent->host_flags & AHCI_FLAG_NO_NCQ) &&
+	    (hpriv->cap & HOST_CAP_NCQ))
+		probe_ent->host_flags |= ATA_FLAG_NCQ;
+
+	ahci_print_info(probe_ent);
+
+	/* FIXME: check ata_device_add return value */
+	ata_device_add(probe_ent);
+	kfree(probe_ent);
+
+	return 0;
+
+err_out_hpriv:
+	kfree(hpriv);
+err_out_iounmap:
+	pci_iounmap(pdev, mmio_base);
+err_out_free_ent:
+	kfree(probe_ent);
+err_out_msi:
+	if (have_msi)
+		pci_disable_msi(pdev);
+	else
+		pci_intx(pdev, 0);
+	pci_release_regions(pdev);
+err_out:
+	if (!pci_dev_busy)
+		pci_disable_device(pdev);
+	return rc;
+}
+
+static void ahci_remove_one (struct pci_dev *pdev)
+{
+	struct device *dev = pci_dev_to_dev(pdev);
+	struct ata_host_set *host_set = dev_get_drvdata(dev);
+	struct ahci_host_priv *hpriv = host_set->private_data;
+	unsigned int i;
+	int have_msi;
+
+	for (i = 0; i < host_set->n_ports; i++)
+		ata_port_detach(host_set->ports[i]);
+
+	have_msi = hpriv->flags & AHCI_FLAG_MSI;
+	free_irq(host_set->irq, host_set);
+
+	for (i = 0; i < host_set->n_ports; i++) {
+		struct ata_port *ap = host_set->ports[i];
+
+		ata_scsi_release(ap->host);
+		scsi_host_put(ap->host);
+	}
+
+	kfree(hpriv);
+	pci_iounmap(pdev, host_set->mmio_base);
+	kfree(host_set);
+
+	if (have_msi)
+		pci_disable_msi(pdev);
+	else
+		pci_intx(pdev, 0);
+	pci_release_regions(pdev);
+	pci_disable_device(pdev);
+	dev_set_drvdata(dev, NULL);
+}
+
+static int __init ahci_init(void)
+{
+	return pci_register_driver(&ahci_pci_driver);
+}
+
+static void __exit ahci_exit(void)
+{
+	pci_unregister_driver(&ahci_pci_driver);
+}
+
+
+MODULE_AUTHOR("Jeff Garzik");
+MODULE_DESCRIPTION("AHCI SATA low-level driver");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, ahci_pci_tbl);
+MODULE_VERSION(DRV_VERSION);
+
+module_init(ahci_init);
+module_exit(ahci_exit);
diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
new file mode 100644
index 0000000..46c34fd
--- /dev/null
+++ b/drivers/ata/ata_piix.c
@@ -0,0 +1,960 @@
+/*
+ *    ata_piix.c - Intel PATA/SATA controllers
+ *
+ *    Maintained by:  Jeff Garzik <jgarzik@pobox.com>
+ *    		    Please ALWAYS copy linux-ide@vger.kernel.org
+ *		    on emails.
+ *
+ *
+ *	Copyright 2003-2005 Red Hat Inc
+ *	Copyright 2003-2005 Jeff Garzik
+ *
+ *
+ *	Copyright header from piix.c:
+ *
+ *  Copyright (C) 1998-1999 Andrzej Krzysztofowicz, Author and Maintainer
+ *  Copyright (C) 1998-2000 Andre Hedrick <andre@linux-ide.org>
+ *  Copyright (C) 2003 Red Hat Inc <alan@redhat.com>
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ *  libata documentation is available via 'make {ps|pdf}docs',
+ *  as Documentation/DocBook/libata.*
+ *
+ *  Hardware documentation available at http://developer.intel.com/
+ *
+ * Documentation
+ *	Publically available from Intel web site. Errata documentation
+ * is also publically available. As an aide to anyone hacking on this
+ * driver the list of errata that are relevant is below.going back to
+ * PIIX4. Older device documentation is now a bit tricky to find.
+ *
+ * The chipsets all follow very much the same design. The orginal Triton
+ * series chipsets do _not_ support independant device timings, but this
+ * is fixed in Triton II. With the odd mobile exception the chips then
+ * change little except in gaining more modes until SATA arrives. This
+ * driver supports only the chips with independant timing (that is those
+ * with SITRE and the 0x44 timing register). See pata_oldpiix and pata_mpiix
+ * for the early chip drivers.
+ *
+ * Errata of note:
+ *
+ * Unfixable
+ *	PIIX4    errata #9	- Only on ultra obscure hw
+ *	ICH3	 errata #13     - Not observed to affect real hw
+ *				  by Intel
+ *
+ * Things we must deal with
+ *	PIIX4	errata #10	- BM IDE hang with non UDMA
+ *				  (must stop/start dma to recover)
+ *	440MX   errata #15	- As PIIX4 errata #10
+ *	PIIX4	errata #15	- Must not read control registers
+ * 				  during a PIO transfer
+ *	440MX   errata #13	- As PIIX4 errata #15
+ *	ICH2	errata #21	- DMA mode 0 doesn't work right
+ *	ICH0/1  errata #55	- As ICH2 errata #21
+ *	ICH2	spec c #9	- Extra operations needed to handle
+ *				  drive hotswap [NOT YET SUPPORTED]
+ *	ICH2    spec c #20	- IDE PRD must not cross a 64K boundary
+ *				  and must be dword aligned
+ *	ICH2    spec c #24	- UDMA mode 4,5 t85/86 should be 6ns not 3.3
+ *
+ * Should have been BIOS fixed:
+ *	450NX:	errata #19	- DMA hangs on old 450NX
+ *	450NX:  errata #20	- DMA hangs on old 450NX
+ *	450NX:  errata #25	- Corruption with DMA on old 450NX
+ *	ICH3    errata #15      - IDE deadlock under high load
+ *				  (BIOS must set dev 31 fn 0 bit 23)
+ *	ICH3	errata #18	- Don't use native mode
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+
+#define DRV_NAME	"ata_piix"
+#define DRV_VERSION	"2.00"
+
+enum {
+	PIIX_IOCFG		= 0x54, /* IDE I/O configuration register */
+	ICH5_PMR		= 0x90, /* port mapping register */
+	ICH5_PCS		= 0x92,	/* port control and status */
+	PIIX_SCC		= 0x0A, /* sub-class code register */
+
+	PIIX_FLAG_IGNORE_PCS	= (1 << 25), /* ignore PCS present bits */
+	PIIX_FLAG_SCR		= (1 << 26), /* SCR available */
+	PIIX_FLAG_AHCI		= (1 << 27), /* AHCI possible */
+	PIIX_FLAG_CHECKINTR	= (1 << 28), /* make sure PCI INTx enabled */
+
+	/* combined mode.  if set, PATA is channel 0.
+	 * if clear, PATA is channel 1.
+	 */
+	PIIX_PORT_ENABLED	= (1 << 0),
+	PIIX_PORT_PRESENT	= (1 << 4),
+
+	PIIX_80C_PRI		= (1 << 5) | (1 << 4),
+	PIIX_80C_SEC		= (1 << 7) | (1 << 6),
+
+	/* controller IDs */
+	piix4_pata		= 0,
+	ich5_pata		= 1,
+	ich5_sata		= 2,
+	esb_sata		= 3,
+	ich6_sata		= 4,
+	ich6_sata_ahci		= 5,
+	ich6m_sata_ahci		= 6,
+	ich8_sata_ahci		= 7,
+
+	/* constants for mapping table */
+	P0			= 0,  /* port 0 */
+	P1			= 1,  /* port 1 */
+	P2			= 2,  /* port 2 */
+	P3			= 3,  /* port 3 */
+	IDE			= -1, /* IDE */
+	NA			= -2, /* not avaliable */
+	RV			= -3, /* reserved */
+
+	PIIX_AHCI_DEVICE	= 6,
+};
+
+struct piix_map_db {
+	const u32 mask;
+	const u16 port_enable;
+	const int present_shift;
+	const int map[][4];
+};
+
+struct piix_host_priv {
+	const int *map;
+	const struct piix_map_db *map_db;
+};
+
+static int piix_init_one (struct pci_dev *pdev,
+				    const struct pci_device_id *ent);
+static void piix_host_stop(struct ata_host_set *host_set);
+static void piix_set_piomode (struct ata_port *ap, struct ata_device *adev);
+static void piix_set_dmamode (struct ata_port *ap, struct ata_device *adev);
+static void piix_pata_error_handler(struct ata_port *ap);
+static void piix_sata_error_handler(struct ata_port *ap);
+
+static unsigned int in_module_init = 1;
+
+static const struct pci_device_id piix_pci_tbl[] = {
+#ifdef ATA_ENABLE_PATA
+	{ 0x8086, 0x7111, PCI_ANY_ID, PCI_ANY_ID, 0, 0, piix4_pata },
+	{ 0x8086, 0x24db, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich5_pata },
+	{ 0x8086, 0x25a2, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich5_pata },
+	{ 0x8086, 0x27df, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich5_pata },
+#endif
+
+	/* NOTE: The following PCI ids must be kept in sync with the
+	 * list in drivers/pci/quirks.c.
+	 */
+
+	/* 82801EB (ICH5) */
+	{ 0x8086, 0x24d1, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich5_sata },
+	/* 82801EB (ICH5) */
+	{ 0x8086, 0x24df, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich5_sata },
+	/* 6300ESB (ICH5 variant with broken PCS present bits) */
+	{ 0x8086, 0x25a3, PCI_ANY_ID, PCI_ANY_ID, 0, 0, esb_sata },
+	/* 6300ESB pretending RAID */
+	{ 0x8086, 0x25b0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, esb_sata },
+	/* 82801FB/FW (ICH6/ICH6W) */
+	{ 0x8086, 0x2651, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich6_sata },
+	/* 82801FR/FRW (ICH6R/ICH6RW) */
+	{ 0x8086, 0x2652, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich6_sata_ahci },
+	/* 82801FBM ICH6M (ICH6R with only port 0 and 2 implemented) */
+	{ 0x8086, 0x2653, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich6m_sata_ahci },
+	/* 82801GB/GR/GH (ICH7, identical to ICH6) */
+	{ 0x8086, 0x27c0, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich6_sata_ahci },
+	/* 2801GBM/GHM (ICH7M, identical to ICH6M) */
+	{ 0x8086, 0x27c4, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich6m_sata_ahci },
+	/* Enterprise Southbridge 2 (where's the datasheet?) */
+	{ 0x8086, 0x2680, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich6_sata_ahci },
+	/* SATA Controller 1 IDE (ICH8, no datasheet yet) */
+	{ 0x8086, 0x2820, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata_ahci },
+	/* SATA Controller 2 IDE (ICH8, ditto) */
+	{ 0x8086, 0x2825, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata_ahci },
+	/* Mobile SATA Controller IDE (ICH8M, ditto) */
+	{ 0x8086, 0x2828, PCI_ANY_ID, PCI_ANY_ID, 0, 0, ich8_sata_ahci },
+
+	{ }	/* terminate list */
+};
+
+static struct pci_driver piix_pci_driver = {
+	.name			= DRV_NAME,
+	.id_table		= piix_pci_tbl,
+	.probe			= piix_init_one,
+	.remove			= ata_pci_remove_one,
+	.suspend		= ata_pci_device_suspend,
+	.resume			= ata_pci_device_resume,
+};
+
+static struct scsi_host_template piix_sht = {
+	.module			= THIS_MODULE,
+	.name			= DRV_NAME,
+	.ioctl			= ata_scsi_ioctl,
+	.queuecommand		= ata_scsi_queuecmd,
+	.can_queue		= ATA_DEF_QUEUE,
+	.this_id		= ATA_SHT_THIS_ID,
+	.sg_tablesize		= LIBATA_MAX_PRD,
+	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
+	.emulated		= ATA_SHT_EMULATED,
+	.use_clustering		= ATA_SHT_USE_CLUSTERING,
+	.proc_name		= DRV_NAME,
+	.dma_boundary		= ATA_DMA_BOUNDARY,
+	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
+	.bios_param		= ata_std_bios_param,
+	.resume			= ata_scsi_device_resume,
+	.suspend		= ata_scsi_device_suspend,
+};
+
+static const struct ata_port_operations piix_pata_ops = {
+	.port_disable		= ata_port_disable,
+	.set_piomode		= piix_set_piomode,
+	.set_dmamode		= piix_set_dmamode,
+	.mode_filter		= ata_pci_default_filter,
+
+	.tf_load		= ata_tf_load,
+	.tf_read		= ata_tf_read,
+	.check_status		= ata_check_status,
+	.exec_command		= ata_exec_command,
+	.dev_select		= ata_std_dev_select,
+
+	.bmdma_setup		= ata_bmdma_setup,
+	.bmdma_start		= ata_bmdma_start,
+	.bmdma_stop		= ata_bmdma_stop,
+	.bmdma_status		= ata_bmdma_status,
+	.qc_prep		= ata_qc_prep,
+	.qc_issue		= ata_qc_issue_prot,
+	.data_xfer		= ata_pio_data_xfer,
+
+	.freeze			= ata_bmdma_freeze,
+	.thaw			= ata_bmdma_thaw,
+	.error_handler		= piix_pata_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
+
+	.irq_handler		= ata_interrupt,
+	.irq_clear		= ata_bmdma_irq_clear,
+
+	.port_start		= ata_port_start,
+	.port_stop		= ata_port_stop,
+	.host_stop		= piix_host_stop,
+};
+
+static const struct ata_port_operations piix_sata_ops = {
+	.port_disable		= ata_port_disable,
+
+	.tf_load		= ata_tf_load,
+	.tf_read		= ata_tf_read,
+	.check_status		= ata_check_status,
+	.exec_command		= ata_exec_command,
+	.dev_select		= ata_std_dev_select,
+
+	.bmdma_setup		= ata_bmdma_setup,
+	.bmdma_start		= ata_bmdma_start,
+	.bmdma_stop		= ata_bmdma_stop,
+	.bmdma_status		= ata_bmdma_status,
+	.qc_prep		= ata_qc_prep,
+	.qc_issue		= ata_qc_issue_prot,
+	.data_xfer		= ata_pio_data_xfer,
+
+	.freeze			= ata_bmdma_freeze,
+	.thaw			= ata_bmdma_thaw,
+	.error_handler		= piix_sata_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
+
+	.irq_handler		= ata_interrupt,
+	.irq_clear		= ata_bmdma_irq_clear,
+
+	.port_start		= ata_port_start,
+	.port_stop		= ata_port_stop,
+	.host_stop		= piix_host_stop,
+};
+
+static const struct piix_map_db ich5_map_db = {
+	.mask = 0x7,
+	.port_enable = 0x3,
+	.present_shift = 4,
+	.map = {
+		/* PM   PS   SM   SS       MAP  */
+		{  P0,  NA,  P1,  NA }, /* 000b */
+		{  P1,  NA,  P0,  NA }, /* 001b */
+		{  RV,  RV,  RV,  RV },
+		{  RV,  RV,  RV,  RV },
+		{  P0,  P1, IDE, IDE }, /* 100b */
+		{  P1,  P0, IDE, IDE }, /* 101b */
+		{ IDE, IDE,  P0,  P1 }, /* 110b */
+		{ IDE, IDE,  P1,  P0 }, /* 111b */
+	},
+};
+
+static const struct piix_map_db ich6_map_db = {
+	.mask = 0x3,
+	.port_enable = 0xf,
+	.present_shift = 4,
+	.map = {
+		/* PM   PS   SM   SS       MAP */
+		{  P0,  P2,  P1,  P3 }, /* 00b */
+		{ IDE, IDE,  P1,  P3 }, /* 01b */
+		{  P0,  P2, IDE, IDE }, /* 10b */
+		{  RV,  RV,  RV,  RV },
+	},
+};
+
+static const struct piix_map_db ich6m_map_db = {
+	.mask = 0x3,
+	.port_enable = 0x5,
+	.present_shift = 4,
+	.map = {
+		/* PM   PS   SM   SS       MAP */
+		{  P0,  P2,  RV,  RV }, /* 00b */
+		{  RV,  RV,  RV,  RV },
+		{  P0,  P2, IDE, IDE }, /* 10b */
+		{  RV,  RV,  RV,  RV },
+	},
+};
+
+static const struct piix_map_db ich8_map_db = {
+	.mask = 0x3,
+	.port_enable = 0x3,
+	.present_shift = 8,
+	.map = {
+		/* PM   PS   SM   SS       MAP */
+		{  P0,  NA,  P1,  NA }, /* 00b (hardwired) */
+		{  RV,  RV,  RV,  RV },
+		{  RV,  RV,  RV,  RV }, /* 10b (never) */
+		{  RV,  RV,  RV,  RV },
+	},
+};
+
+static const struct piix_map_db *piix_map_db_table[] = {
+	[ich5_sata]		= &ich5_map_db,
+	[esb_sata]		= &ich5_map_db,
+	[ich6_sata]		= &ich6_map_db,
+	[ich6_sata_ahci]	= &ich6_map_db,
+	[ich6m_sata_ahci]	= &ich6m_map_db,
+	[ich8_sata_ahci]	= &ich8_map_db,
+};
+
+static struct ata_port_info piix_port_info[] = {
+	/* piix4_pata */
+	{
+		.sht		= &piix_sht,
+		.host_flags	= ATA_FLAG_SLAVE_POSS,
+		.pio_mask	= 0x1f,	/* pio0-4 */
+#if 0
+		.mwdma_mask	= 0x06, /* mwdma1-2 */
+#else
+		.mwdma_mask	= 0x00, /* mwdma broken */
+#endif
+		.udma_mask	= ATA_UDMA_MASK_40C,
+		.port_ops	= &piix_pata_ops,
+	},
+
+	/* ich5_pata */
+	{
+		.sht		= &piix_sht,
+		.host_flags	= ATA_FLAG_SLAVE_POSS | PIIX_FLAG_CHECKINTR,
+		.pio_mask	= 0x1f,	/* pio0-4 */
+#if 0
+		.mwdma_mask	= 0x06, /* mwdma1-2 */
+#else
+		.mwdma_mask	= 0x00, /* mwdma broken */
+#endif
+		.udma_mask	= 0x3f, /* udma0-5 */
+		.port_ops	= &piix_pata_ops,
+	},
+
+	/* ich5_sata */
+	{
+		.sht		= &piix_sht,
+		.host_flags	= ATA_FLAG_SATA | PIIX_FLAG_CHECKINTR,
+		.pio_mask	= 0x1f,	/* pio0-4 */
+		.mwdma_mask	= 0x07, /* mwdma0-2 */
+		.udma_mask	= 0x7f,	/* udma0-6 */
+		.port_ops	= &piix_sata_ops,
+	},
+
+	/* i6300esb_sata */
+	{
+		.sht		= &piix_sht,
+		.host_flags	= ATA_FLAG_SATA |
+				  PIIX_FLAG_CHECKINTR | PIIX_FLAG_IGNORE_PCS,
+		.pio_mask	= 0x1f,	/* pio0-4 */
+		.mwdma_mask	= 0x07, /* mwdma0-2 */
+		.udma_mask	= 0x7f,	/* udma0-6 */
+		.port_ops	= &piix_sata_ops,
+	},
+
+	/* ich6_sata */
+	{
+		.sht		= &piix_sht,
+		.host_flags	= ATA_FLAG_SATA |
+				  PIIX_FLAG_CHECKINTR | PIIX_FLAG_SCR,
+		.pio_mask	= 0x1f,	/* pio0-4 */
+		.mwdma_mask	= 0x07, /* mwdma0-2 */
+		.udma_mask	= 0x7f,	/* udma0-6 */
+		.port_ops	= &piix_sata_ops,
+	},
+
+	/* ich6_sata_ahci */
+	{
+		.sht		= &piix_sht,
+		.host_flags	= ATA_FLAG_SATA |
+				  PIIX_FLAG_CHECKINTR | PIIX_FLAG_SCR |
+				  PIIX_FLAG_AHCI,
+		.pio_mask	= 0x1f,	/* pio0-4 */
+		.mwdma_mask	= 0x07, /* mwdma0-2 */
+		.udma_mask	= 0x7f,	/* udma0-6 */
+		.port_ops	= &piix_sata_ops,
+	},
+
+	/* ich6m_sata_ahci */
+	{
+		.sht		= &piix_sht,
+		.host_flags	= ATA_FLAG_SATA |
+				  PIIX_FLAG_CHECKINTR | PIIX_FLAG_SCR |
+				  PIIX_FLAG_AHCI,
+		.pio_mask	= 0x1f,	/* pio0-4 */
+		.mwdma_mask	= 0x07, /* mwdma0-2 */
+		.udma_mask	= 0x7f,	/* udma0-6 */
+		.port_ops	= &piix_sata_ops,
+	},
+
+	/* ich8_sata_ahci */
+	{
+		.sht		= &piix_sht,
+		.host_flags	= ATA_FLAG_SATA |
+				  PIIX_FLAG_CHECKINTR | PIIX_FLAG_SCR |
+				  PIIX_FLAG_AHCI,
+		.pio_mask	= 0x1f,	/* pio0-4 */
+		.mwdma_mask	= 0x07, /* mwdma0-2 */
+		.udma_mask	= 0x7f,	/* udma0-6 */
+		.port_ops	= &piix_sata_ops,
+	},
+};
+
+static struct pci_bits piix_enable_bits[] = {
+	{ 0x41U, 1U, 0x80UL, 0x80UL },	/* port 0 */
+	{ 0x43U, 1U, 0x80UL, 0x80UL },	/* port 1 */
+};
+
+MODULE_AUTHOR("Andre Hedrick, Alan Cox, Andrzej Krzysztofowicz, Jeff Garzik");
+MODULE_DESCRIPTION("SCSI low-level driver for Intel PIIX/ICH ATA controllers");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, piix_pci_tbl);
+MODULE_VERSION(DRV_VERSION);
+
+/**
+ *	piix_pata_cbl_detect - Probe host controller cable detect info
+ *	@ap: Port for which cable detect info is desired
+ *
+ *	Read 80c cable indicator from ATA PCI device's PCI config
+ *	register.  This register is normally set by firmware (BIOS).
+ *
+ *	LOCKING:
+ *	None (inherited from caller).
+ */
+static void piix_pata_cbl_detect(struct ata_port *ap)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host_set->dev);
+	u8 tmp, mask;
+
+	/* no 80c support in host controller? */
+	if ((ap->udma_mask & ~ATA_UDMA_MASK_40C) == 0)
+		goto cbl40;
+
+	/* check BIOS cable detect results */
+	mask = ap->port_no == 0 ? PIIX_80C_PRI : PIIX_80C_SEC;
+	pci_read_config_byte(pdev, PIIX_IOCFG, &tmp);
+	if ((tmp & mask) == 0)
+		goto cbl40;
+
+	ap->cbl = ATA_CBL_PATA80;
+	return;
+
+cbl40:
+	ap->cbl = ATA_CBL_PATA40;
+	ap->udma_mask &= ATA_UDMA_MASK_40C;
+}
+
+/**
+ *	piix_pata_prereset - prereset for PATA host controller
+ *	@ap: Target port
+ *
+ *	Prereset including cable detection.
+ *
+ *	LOCKING:
+ *	None (inherited from caller).
+ */
+static int piix_pata_prereset(struct ata_port *ap)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host_set->dev);
+
+	if (!pci_test_config_bits(pdev, &piix_enable_bits[ap->port_no])) {
+		ata_port_printk(ap, KERN_INFO, "port disabled. ignoring.\n");
+		ap->eh_context.i.action &= ~ATA_EH_RESET_MASK;
+		return 0;
+	}
+
+	piix_pata_cbl_detect(ap);
+
+	return ata_std_prereset(ap);
+}
+
+static void piix_pata_error_handler(struct ata_port *ap)
+{
+	ata_bmdma_drive_eh(ap, piix_pata_prereset, ata_std_softreset, NULL,
+			   ata_std_postreset);
+}
+
+/**
+ *	piix_sata_prereset - prereset for SATA host controller
+ *	@ap: Target port
+ *
+ *	Reads and configures SATA PCI device's PCI config register
+ *	Port Configuration and Status (PCS) to determine port and
+ *	device availability.  Return -ENODEV to skip reset if no
+ *	device is present.
+ *
+ *	LOCKING:
+ *	None (inherited from caller).
+ *
+ *	RETURNS:
+ *	0 if device is present, -ENODEV otherwise.
+ */
+static int piix_sata_prereset(struct ata_port *ap)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host_set->dev);
+	struct piix_host_priv *hpriv = ap->host_set->private_data;
+	const unsigned int *map = hpriv->map;
+	int base = 2 * ap->port_no;
+	unsigned int present = 0;
+	int port, i;
+	u16 pcs;
+
+	pci_read_config_word(pdev, ICH5_PCS, &pcs);
+	DPRINTK("ata%u: ENTER, pcs=0x%x base=%d\n", ap->id, pcs, base);
+
+	for (i = 0; i < 2; i++) {
+		port = map[base + i];
+		if (port < 0)
+			continue;
+		if ((ap->flags & PIIX_FLAG_IGNORE_PCS) ||
+		    (pcs & 1 << (hpriv->map_db->present_shift + port)))
+			present = 1;
+	}
+
+	DPRINTK("ata%u: LEAVE, pcs=0x%x present=0x%x\n",
+		ap->id, pcs, present);
+
+	if (!present) {
+		ata_port_printk(ap, KERN_INFO, "SATA port has no device.\n");
+		ap->eh_context.i.action &= ~ATA_EH_RESET_MASK;
+		return 0;
+	}
+
+	return ata_std_prereset(ap);
+}
+
+static void piix_sata_error_handler(struct ata_port *ap)
+{
+	ata_bmdma_drive_eh(ap, piix_sata_prereset, ata_std_softreset, NULL,
+			   ata_std_postreset);
+}
+
+/**
+ *	piix_set_piomode - Initialize host controller PATA PIO timings
+ *	@ap: Port whose timings we are configuring
+ *	@adev: um
+ *
+ *	Set PIO mode for device, in host controller PCI config space.
+ *
+ *	LOCKING:
+ *	None (inherited from caller).
+ */
+
+static void piix_set_piomode (struct ata_port *ap, struct ata_device *adev)
+{
+	unsigned int pio	= adev->pio_mode - XFER_PIO_0;
+	struct pci_dev *dev	= to_pci_dev(ap->host_set->dev);
+	unsigned int is_slave	= (adev->devno != 0);
+	unsigned int master_port= ap->port_no ? 0x42 : 0x40;
+	unsigned int slave_port	= 0x44;
+	u16 master_data;
+	u8 slave_data;
+
+	static const	 /* ISP  RTC */
+	u8 timings[][2]	= { { 0, 0 },
+			    { 0, 0 },
+			    { 1, 0 },
+			    { 2, 1 },
+			    { 2, 3 }, };
+
+	pci_read_config_word(dev, master_port, &master_data);
+	if (is_slave) {
+		master_data |= 0x4000;
+		/* enable PPE, IE and TIME */
+		master_data |= 0x0070;
+		pci_read_config_byte(dev, slave_port, &slave_data);
+		slave_data &= (ap->port_no ? 0x0f : 0xf0);
+		slave_data |=
+			(timings[pio][0] << 2) |
+			(timings[pio][1] << (ap->port_no ? 4 : 0));
+	} else {
+		master_data &= 0xccf8;
+		/* enable PPE, IE and TIME */
+		master_data |= 0x0007;
+		master_data |=
+			(timings[pio][0] << 12) |
+			(timings[pio][1] << 8);
+	}
+	pci_write_config_word(dev, master_port, master_data);
+	if (is_slave)
+		pci_write_config_byte(dev, slave_port, slave_data);
+}
+
+/**
+ *	piix_set_dmamode - Initialize host controller PATA PIO timings
+ *	@ap: Port whose timings we are configuring
+ *	@adev: um
+ *	@udma: udma mode, 0 - 6
+ *
+ *	Set UDMA mode for device, in host controller PCI config space.
+ *
+ *	LOCKING:
+ *	None (inherited from caller).
+ */
+
+static void piix_set_dmamode (struct ata_port *ap, struct ata_device *adev)
+{
+	unsigned int udma	= adev->dma_mode; /* FIXME: MWDMA too */
+	struct pci_dev *dev	= to_pci_dev(ap->host_set->dev);
+	u8 maslave		= ap->port_no ? 0x42 : 0x40;
+	u8 speed		= udma;
+	unsigned int drive_dn	= (ap->port_no ? 2 : 0) + adev->devno;
+	int a_speed		= 3 << (drive_dn * 4);
+	int u_flag		= 1 << drive_dn;
+	int v_flag		= 0x01 << drive_dn;
+	int w_flag		= 0x10 << drive_dn;
+	int u_speed		= 0;
+	int			sitre;
+	u16			reg4042, reg4a;
+	u8			reg48, reg54, reg55;
+
+	pci_read_config_word(dev, maslave, &reg4042);
+	DPRINTK("reg4042 = 0x%04x\n", reg4042);
+	sitre = (reg4042 & 0x4000) ? 1 : 0;
+	pci_read_config_byte(dev, 0x48, &reg48);
+	pci_read_config_word(dev, 0x4a, &reg4a);
+	pci_read_config_byte(dev, 0x54, &reg54);
+	pci_read_config_byte(dev, 0x55, &reg55);
+
+	switch(speed) {
+		case XFER_UDMA_4:
+		case XFER_UDMA_2:	u_speed = 2 << (drive_dn * 4); break;
+		case XFER_UDMA_6:
+		case XFER_UDMA_5:
+		case XFER_UDMA_3:
+		case XFER_UDMA_1:	u_speed = 1 << (drive_dn * 4); break;
+		case XFER_UDMA_0:	u_speed = 0 << (drive_dn * 4); break;
+		case XFER_MW_DMA_2:
+		case XFER_MW_DMA_1:	break;
+		default:
+			BUG();
+			return;
+	}
+
+	if (speed >= XFER_UDMA_0) {
+		if (!(reg48 & u_flag))
+			pci_write_config_byte(dev, 0x48, reg48 | u_flag);
+		if (speed == XFER_UDMA_5) {
+			pci_write_config_byte(dev, 0x55, (u8) reg55|w_flag);
+		} else {
+			pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
+		}
+		if ((reg4a & a_speed) != u_speed)
+			pci_write_config_word(dev, 0x4a, (reg4a & ~a_speed) | u_speed);
+		if (speed > XFER_UDMA_2) {
+			if (!(reg54 & v_flag))
+				pci_write_config_byte(dev, 0x54, reg54 | v_flag);
+		} else
+			pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
+	} else {
+		if (reg48 & u_flag)
+			pci_write_config_byte(dev, 0x48, reg48 & ~u_flag);
+		if (reg4a & a_speed)
+			pci_write_config_word(dev, 0x4a, reg4a & ~a_speed);
+		if (reg54 & v_flag)
+			pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
+		if (reg55 & w_flag)
+			pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
+	}
+}
+
+#define AHCI_PCI_BAR 5
+#define AHCI_GLOBAL_CTL 0x04
+#define AHCI_ENABLE (1 << 31)
+static int piix_disable_ahci(struct pci_dev *pdev)
+{
+	void __iomem *mmio;
+	u32 tmp;
+	int rc = 0;
+
+	/* BUG: pci_enable_device has not yet been called.  This
+	 * works because this device is usually set up by BIOS.
+	 */
+
+	if (!pci_resource_start(pdev, AHCI_PCI_BAR) ||
+	    !pci_resource_len(pdev, AHCI_PCI_BAR))
+		return 0;
+
+	mmio = pci_iomap(pdev, AHCI_PCI_BAR, 64);
+	if (!mmio)
+		return -ENOMEM;
+
+	tmp = readl(mmio + AHCI_GLOBAL_CTL);
+	if (tmp & AHCI_ENABLE) {
+		tmp &= ~AHCI_ENABLE;
+		writel(tmp, mmio + AHCI_GLOBAL_CTL);
+
+		tmp = readl(mmio + AHCI_GLOBAL_CTL);
+		if (tmp & AHCI_ENABLE)
+			rc = -EIO;
+	}
+
+	pci_iounmap(pdev, mmio);
+	return rc;
+}
+
+/**
+ *	piix_check_450nx_errata	-	Check for problem 450NX setup
+ *	@ata_dev: the PCI device to check
+ *
+ *	Check for the present of 450NX errata #19 and errata #25. If
+ *	they are found return an error code so we can turn off DMA
+ */
+
+static int __devinit piix_check_450nx_errata(struct pci_dev *ata_dev)
+{
+	struct pci_dev *pdev = NULL;
+	u16 cfg;
+	u8 rev;
+	int no_piix_dma = 0;
+
+	while((pdev = pci_get_device(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82454NX, pdev)) != NULL)
+	{
+		/* Look for 450NX PXB. Check for problem configurations
+		   A PCI quirk checks bit 6 already */
+		pci_read_config_byte(pdev, PCI_REVISION_ID, &rev);
+		pci_read_config_word(pdev, 0x41, &cfg);
+		/* Only on the original revision: IDE DMA can hang */
+		if (rev == 0x00)
+			no_piix_dma = 1;
+		/* On all revisions below 5 PXB bus lock must be disabled for IDE */
+		else if (cfg & (1<<14) && rev < 5)
+			no_piix_dma = 2;
+	}
+	if (no_piix_dma)
+		dev_printk(KERN_WARNING, &ata_dev->dev, "450NX errata present, disabling IDE DMA.\n");
+	if (no_piix_dma == 2)
+		dev_printk(KERN_WARNING, &ata_dev->dev, "A BIOS update may resolve this.\n");
+	return no_piix_dma;
+}
+
+static void __devinit piix_init_pcs(struct pci_dev *pdev,
+				    const struct piix_map_db *map_db)
+{
+	u16 pcs, new_pcs;
+
+	pci_read_config_word(pdev, ICH5_PCS, &pcs);
+
+	new_pcs = pcs | map_db->port_enable;
+
+	if (new_pcs != pcs) {
+		DPRINTK("updating PCS from 0x%x to 0x%x\n", pcs, new_pcs);
+		pci_write_config_word(pdev, ICH5_PCS, new_pcs);
+		msleep(150);
+	}
+}
+
+static void __devinit piix_init_sata_map(struct pci_dev *pdev,
+					 struct ata_port_info *pinfo,
+					 const struct piix_map_db *map_db)
+{
+	struct piix_host_priv *hpriv = pinfo[0].private_data;
+	const unsigned int *map;
+	int i, invalid_map = 0;
+	u8 map_value;
+
+	pci_read_config_byte(pdev, ICH5_PMR, &map_value);
+
+	map = map_db->map[map_value & map_db->mask];
+
+	dev_printk(KERN_INFO, &pdev->dev, "MAP [");
+	for (i = 0; i < 4; i++) {
+		switch (map[i]) {
+		case RV:
+			invalid_map = 1;
+			printk(" XX");
+			break;
+
+		case NA:
+			printk(" --");
+			break;
+
+		case IDE:
+			WARN_ON((i & 1) || map[i + 1] != IDE);
+			pinfo[i / 2] = piix_port_info[ich5_pata];
+			pinfo[i / 2].private_data = hpriv;
+			i++;
+			printk(" IDE IDE");
+			break;
+
+		default:
+			printk(" P%d", map[i]);
+			if (i & 1)
+				pinfo[i / 2].host_flags |= ATA_FLAG_SLAVE_POSS;
+			break;
+		}
+	}
+	printk(" ]\n");
+
+	if (invalid_map)
+		dev_printk(KERN_ERR, &pdev->dev,
+			   "invalid MAP value %u\n", map_value);
+
+	hpriv->map = map;
+	hpriv->map_db = map_db;
+}
+
+/**
+ *	piix_init_one - Register PIIX ATA PCI device with kernel services
+ *	@pdev: PCI device to register
+ *	@ent: Entry in piix_pci_tbl matching with @pdev
+ *
+ *	Called from kernel PCI layer.  We probe for combined mode (sigh),
+ *	and then hand over control to libata, for it to do the rest.
+ *
+ *	LOCKING:
+ *	Inherited from PCI layer (may sleep).
+ *
+ *	RETURNS:
+ *	Zero on success, or -ERRNO value.
+ */
+
+static int piix_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	static int printed_version;
+	struct ata_port_info port_info[2];
+	struct ata_port_info *ppinfo[2] = { &port_info[0], &port_info[1] };
+	struct piix_host_priv *hpriv;
+	unsigned long host_flags;
+
+	if (!printed_version++)
+		dev_printk(KERN_DEBUG, &pdev->dev,
+			   "version " DRV_VERSION "\n");
+
+	/* no hotplugging support (FIXME) */
+	if (!in_module_init)
+		return -ENODEV;
+
+	hpriv = kzalloc(sizeof(*hpriv), GFP_KERNEL);
+	if (!hpriv)
+		return -ENOMEM;
+
+	port_info[0] = piix_port_info[ent->driver_data];
+	port_info[1] = piix_port_info[ent->driver_data];
+	port_info[0].private_data = hpriv;
+	port_info[1].private_data = hpriv;
+
+	host_flags = port_info[0].host_flags;
+
+	if (host_flags & PIIX_FLAG_AHCI) {
+		u8 tmp;
+		pci_read_config_byte(pdev, PIIX_SCC, &tmp);
+		if (tmp == PIIX_AHCI_DEVICE) {
+			int rc = piix_disable_ahci(pdev);
+			if (rc)
+				return rc;
+		}
+	}
+
+	/* Initialize SATA map */
+	if (host_flags & ATA_FLAG_SATA) {
+		piix_init_sata_map(pdev, port_info,
+				   piix_map_db_table[ent->driver_data]);
+		piix_init_pcs(pdev, piix_map_db_table[ent->driver_data]);
+	}
+
+	/* On ICH5, some BIOSen disable the interrupt using the
+	 * PCI_COMMAND_INTX_DISABLE bit added in PCI 2.3.
+	 * On ICH6, this bit has the same effect, but only when
+	 * MSI is disabled (and it is disabled, as we don't use
+	 * message-signalled interrupts currently).
+	 */
+	if (host_flags & PIIX_FLAG_CHECKINTR)
+		pci_intx(pdev, 1);
+
+	if (piix_check_450nx_errata(pdev)) {
+		/* This writes into the master table but it does not
+		   really matter for this errata as we will apply it to
+		   all the PIIX devices on the board */
+		port_info[0].mwdma_mask = 0;
+		port_info[0].udma_mask = 0;
+		port_info[1].mwdma_mask = 0;
+		port_info[1].udma_mask = 0;
+	}
+	return ata_pci_init_one(pdev, ppinfo, 2);
+}
+
+static void piix_host_stop(struct ata_host_set *host_set)
+{
+	ata_host_stop(host_set);
+}
+
+static int __init piix_init(void)
+{
+	int rc;
+
+	DPRINTK("pci_register_driver\n");
+	rc = pci_register_driver(&piix_pci_driver);
+	if (rc)
+		return rc;
+
+	in_module_init = 0;
+
+	DPRINTK("done\n");
+	return 0;
+}
+
+static void __exit piix_exit(void)
+{
+	pci_unregister_driver(&piix_pci_driver);
+}
+
+module_init(piix_init);
+module_exit(piix_exit);
+
diff --git a/drivers/ata/libata-bmdma.c b/drivers/ata/libata-bmdma.c
new file mode 100644
index 0000000..158f62db
--- /dev/null
+++ b/drivers/ata/libata-bmdma.c
@@ -0,0 +1,1109 @@
+/*
+ *  libata-bmdma.c - helper library for PCI IDE BMDMA
+ *
+ *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
+ *    		    Please ALWAYS copy linux-ide@vger.kernel.org
+ *		    on emails.
+ *
+ *  Copyright 2003-2006 Red Hat, Inc.  All rights reserved.
+ *  Copyright 2003-2006 Jeff Garzik
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ *  libata documentation is available via 'make {ps|pdf}docs',
+ *  as Documentation/DocBook/libata.*
+ *
+ *  Hardware documentation available from http://www.t13.org/ and
+ *  http://www.sata-io.org/
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/libata.h>
+
+#include "libata.h"
+
+/**
+ *	ata_tf_load_pio - send taskfile registers to host controller
+ *	@ap: Port to which output is sent
+ *	@tf: ATA taskfile register set
+ *
+ *	Outputs ATA taskfile to standard ATA host controller.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+
+static void ata_tf_load_pio(struct ata_port *ap, const struct ata_taskfile *tf)
+{
+	struct ata_ioports *ioaddr = &ap->ioaddr;
+	unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
+
+	if (tf->ctl != ap->last_ctl) {
+		outb(tf->ctl, ioaddr->ctl_addr);
+		ap->last_ctl = tf->ctl;
+		ata_wait_idle(ap);
+	}
+
+	if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
+		outb(tf->hob_feature, ioaddr->feature_addr);
+		outb(tf->hob_nsect, ioaddr->nsect_addr);
+		outb(tf->hob_lbal, ioaddr->lbal_addr);
+		outb(tf->hob_lbam, ioaddr->lbam_addr);
+		outb(tf->hob_lbah, ioaddr->lbah_addr);
+		VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
+			tf->hob_feature,
+			tf->hob_nsect,
+			tf->hob_lbal,
+			tf->hob_lbam,
+			tf->hob_lbah);
+	}
+
+	if (is_addr) {
+		outb(tf->feature, ioaddr->feature_addr);
+		outb(tf->nsect, ioaddr->nsect_addr);
+		outb(tf->lbal, ioaddr->lbal_addr);
+		outb(tf->lbam, ioaddr->lbam_addr);
+		outb(tf->lbah, ioaddr->lbah_addr);
+		VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
+			tf->feature,
+			tf->nsect,
+			tf->lbal,
+			tf->lbam,
+			tf->lbah);
+	}
+
+	if (tf->flags & ATA_TFLAG_DEVICE) {
+		outb(tf->device, ioaddr->device_addr);
+		VPRINTK("device 0x%X\n", tf->device);
+	}
+
+	ata_wait_idle(ap);
+}
+
+/**
+ *	ata_tf_load_mmio - send taskfile registers to host controller
+ *	@ap: Port to which output is sent
+ *	@tf: ATA taskfile register set
+ *
+ *	Outputs ATA taskfile to standard ATA host controller using MMIO.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+
+static void ata_tf_load_mmio(struct ata_port *ap, const struct ata_taskfile *tf)
+{
+	struct ata_ioports *ioaddr = &ap->ioaddr;
+	unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
+
+	if (tf->ctl != ap->last_ctl) {
+		writeb(tf->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
+		ap->last_ctl = tf->ctl;
+		ata_wait_idle(ap);
+	}
+
+	if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
+		writeb(tf->hob_feature, (void __iomem *) ioaddr->feature_addr);
+		writeb(tf->hob_nsect, (void __iomem *) ioaddr->nsect_addr);
+		writeb(tf->hob_lbal, (void __iomem *) ioaddr->lbal_addr);
+		writeb(tf->hob_lbam, (void __iomem *) ioaddr->lbam_addr);
+		writeb(tf->hob_lbah, (void __iomem *) ioaddr->lbah_addr);
+		VPRINTK("hob: feat 0x%X nsect 0x%X, lba 0x%X 0x%X 0x%X\n",
+			tf->hob_feature,
+			tf->hob_nsect,
+			tf->hob_lbal,
+			tf->hob_lbam,
+			tf->hob_lbah);
+	}
+
+	if (is_addr) {
+		writeb(tf->feature, (void __iomem *) ioaddr->feature_addr);
+		writeb(tf->nsect, (void __iomem *) ioaddr->nsect_addr);
+		writeb(tf->lbal, (void __iomem *) ioaddr->lbal_addr);
+		writeb(tf->lbam, (void __iomem *) ioaddr->lbam_addr);
+		writeb(tf->lbah, (void __iomem *) ioaddr->lbah_addr);
+		VPRINTK("feat 0x%X nsect 0x%X lba 0x%X 0x%X 0x%X\n",
+			tf->feature,
+			tf->nsect,
+			tf->lbal,
+			tf->lbam,
+			tf->lbah);
+	}
+
+	if (tf->flags & ATA_TFLAG_DEVICE) {
+		writeb(tf->device, (void __iomem *) ioaddr->device_addr);
+		VPRINTK("device 0x%X\n", tf->device);
+	}
+
+	ata_wait_idle(ap);
+}
+
+
+/**
+ *	ata_tf_load - send taskfile registers to host controller
+ *	@ap: Port to which output is sent
+ *	@tf: ATA taskfile register set
+ *
+ *	Outputs ATA taskfile to standard ATA host controller using MMIO
+ *	or PIO as indicated by the ATA_FLAG_MMIO flag.
+ *	Writes the control, feature, nsect, lbal, lbam, and lbah registers.
+ *	Optionally (ATA_TFLAG_LBA48) writes hob_feature, hob_nsect,
+ *	hob_lbal, hob_lbam, and hob_lbah.
+ *
+ *	This function waits for idle (!BUSY and !DRQ) after writing
+ *	registers.  If the control register has a new value, this
+ *	function also waits for idle after writing control and before
+ *	writing the remaining registers.
+ *
+ *	May be used as the tf_load() entry in ata_port_operations.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+void ata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
+{
+	if (ap->flags & ATA_FLAG_MMIO)
+		ata_tf_load_mmio(ap, tf);
+	else
+		ata_tf_load_pio(ap, tf);
+}
+
+/**
+ *	ata_exec_command_pio - issue ATA command to host controller
+ *	@ap: port to which command is being issued
+ *	@tf: ATA taskfile register set
+ *
+ *	Issues PIO write to ATA command register, with proper
+ *	synchronization with interrupt handler / other threads.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+static void ata_exec_command_pio(struct ata_port *ap, const struct ata_taskfile *tf)
+{
+	DPRINTK("ata%u: cmd 0x%X\n", ap->id, tf->command);
+
+       	outb(tf->command, ap->ioaddr.command_addr);
+	ata_pause(ap);
+}
+
+
+/**
+ *	ata_exec_command_mmio - issue ATA command to host controller
+ *	@ap: port to which command is being issued
+ *	@tf: ATA taskfile register set
+ *
+ *	Issues MMIO write to ATA command register, with proper
+ *	synchronization with interrupt handler / other threads.
+ *
+ *	FIXME: missing write posting for 400nS delay enforcement
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+static void ata_exec_command_mmio(struct ata_port *ap, const struct ata_taskfile *tf)
+{
+	DPRINTK("ata%u: cmd 0x%X\n", ap->id, tf->command);
+
+       	writeb(tf->command, (void __iomem *) ap->ioaddr.command_addr);
+	ata_pause(ap);
+}
+
+
+/**
+ *	ata_exec_command - issue ATA command to host controller
+ *	@ap: port to which command is being issued
+ *	@tf: ATA taskfile register set
+ *
+ *	Issues PIO/MMIO write to ATA command register, with proper
+ *	synchronization with interrupt handler / other threads.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+void ata_exec_command(struct ata_port *ap, const struct ata_taskfile *tf)
+{
+	if (ap->flags & ATA_FLAG_MMIO)
+		ata_exec_command_mmio(ap, tf);
+	else
+		ata_exec_command_pio(ap, tf);
+}
+
+/**
+ *	ata_tf_read_pio - input device's ATA taskfile shadow registers
+ *	@ap: Port from which input is read
+ *	@tf: ATA taskfile register set for storing input
+ *
+ *	Reads ATA taskfile registers for currently-selected device
+ *	into @tf.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+
+static void ata_tf_read_pio(struct ata_port *ap, struct ata_taskfile *tf)
+{
+	struct ata_ioports *ioaddr = &ap->ioaddr;
+
+	tf->command = ata_check_status(ap);
+	tf->feature = inb(ioaddr->error_addr);
+	tf->nsect = inb(ioaddr->nsect_addr);
+	tf->lbal = inb(ioaddr->lbal_addr);
+	tf->lbam = inb(ioaddr->lbam_addr);
+	tf->lbah = inb(ioaddr->lbah_addr);
+	tf->device = inb(ioaddr->device_addr);
+
+	if (tf->flags & ATA_TFLAG_LBA48) {
+		outb(tf->ctl | ATA_HOB, ioaddr->ctl_addr);
+		tf->hob_feature = inb(ioaddr->error_addr);
+		tf->hob_nsect = inb(ioaddr->nsect_addr);
+		tf->hob_lbal = inb(ioaddr->lbal_addr);
+		tf->hob_lbam = inb(ioaddr->lbam_addr);
+		tf->hob_lbah = inb(ioaddr->lbah_addr);
+	}
+}
+
+/**
+ *	ata_tf_read_mmio - input device's ATA taskfile shadow registers
+ *	@ap: Port from which input is read
+ *	@tf: ATA taskfile register set for storing input
+ *
+ *	Reads ATA taskfile registers for currently-selected device
+ *	into @tf via MMIO.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+
+static void ata_tf_read_mmio(struct ata_port *ap, struct ata_taskfile *tf)
+{
+	struct ata_ioports *ioaddr = &ap->ioaddr;
+
+	tf->command = ata_check_status(ap);
+	tf->feature = readb((void __iomem *)ioaddr->error_addr);
+	tf->nsect = readb((void __iomem *)ioaddr->nsect_addr);
+	tf->lbal = readb((void __iomem *)ioaddr->lbal_addr);
+	tf->lbam = readb((void __iomem *)ioaddr->lbam_addr);
+	tf->lbah = readb((void __iomem *)ioaddr->lbah_addr);
+	tf->device = readb((void __iomem *)ioaddr->device_addr);
+
+	if (tf->flags & ATA_TFLAG_LBA48) {
+		writeb(tf->ctl | ATA_HOB, (void __iomem *) ap->ioaddr.ctl_addr);
+		tf->hob_feature = readb((void __iomem *)ioaddr->error_addr);
+		tf->hob_nsect = readb((void __iomem *)ioaddr->nsect_addr);
+		tf->hob_lbal = readb((void __iomem *)ioaddr->lbal_addr);
+		tf->hob_lbam = readb((void __iomem *)ioaddr->lbam_addr);
+		tf->hob_lbah = readb((void __iomem *)ioaddr->lbah_addr);
+	}
+}
+
+
+/**
+ *	ata_tf_read - input device's ATA taskfile shadow registers
+ *	@ap: Port from which input is read
+ *	@tf: ATA taskfile register set for storing input
+ *
+ *	Reads ATA taskfile registers for currently-selected device
+ *	into @tf.
+ *
+ *	Reads nsect, lbal, lbam, lbah, and device.  If ATA_TFLAG_LBA48
+ *	is set, also reads the hob registers.
+ *
+ *	May be used as the tf_read() entry in ata_port_operations.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+void ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
+{
+	if (ap->flags & ATA_FLAG_MMIO)
+		ata_tf_read_mmio(ap, tf);
+	else
+		ata_tf_read_pio(ap, tf);
+}
+
+/**
+ *	ata_check_status_pio - Read device status reg & clear interrupt
+ *	@ap: port where the device is
+ *
+ *	Reads ATA taskfile status register for currently-selected device
+ *	and return its value. This also clears pending interrupts
+ *      from this device
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+static u8 ata_check_status_pio(struct ata_port *ap)
+{
+	return inb(ap->ioaddr.status_addr);
+}
+
+/**
+ *	ata_check_status_mmio - Read device status reg & clear interrupt
+ *	@ap: port where the device is
+ *
+ *	Reads ATA taskfile status register for currently-selected device
+ *	via MMIO and return its value. This also clears pending interrupts
+ *      from this device
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+static u8 ata_check_status_mmio(struct ata_port *ap)
+{
+       	return readb((void __iomem *) ap->ioaddr.status_addr);
+}
+
+
+/**
+ *	ata_check_status - Read device status reg & clear interrupt
+ *	@ap: port where the device is
+ *
+ *	Reads ATA taskfile status register for currently-selected device
+ *	and return its value. This also clears pending interrupts
+ *      from this device
+ *
+ *	May be used as the check_status() entry in ata_port_operations.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+u8 ata_check_status(struct ata_port *ap)
+{
+	if (ap->flags & ATA_FLAG_MMIO)
+		return ata_check_status_mmio(ap);
+	return ata_check_status_pio(ap);
+}
+
+
+/**
+ *	ata_altstatus - Read device alternate status reg
+ *	@ap: port where the device is
+ *
+ *	Reads ATA taskfile alternate status register for
+ *	currently-selected device and return its value.
+ *
+ *	Note: may NOT be used as the check_altstatus() entry in
+ *	ata_port_operations.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+u8 ata_altstatus(struct ata_port *ap)
+{
+	if (ap->ops->check_altstatus)
+		return ap->ops->check_altstatus(ap);
+
+	if (ap->flags & ATA_FLAG_MMIO)
+		return readb((void __iomem *)ap->ioaddr.altstatus_addr);
+	return inb(ap->ioaddr.altstatus_addr);
+}
+
+/**
+ *	ata_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction
+ *	@qc: Info associated with this ATA transaction.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+static void ata_bmdma_setup_mmio (struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
+	u8 dmactl;
+	void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
+
+	/* load PRD table addr. */
+	mb();	/* make sure PRD table writes are visible to controller */
+	writel(ap->prd_dma, mmio + ATA_DMA_TABLE_OFS);
+
+	/* specify data direction, triple-check start bit is clear */
+	dmactl = readb(mmio + ATA_DMA_CMD);
+	dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
+	if (!rw)
+		dmactl |= ATA_DMA_WR;
+	writeb(dmactl, mmio + ATA_DMA_CMD);
+
+	/* issue r/w command */
+	ap->ops->exec_command(ap, &qc->tf);
+}
+
+/**
+ *	ata_bmdma_start_mmio - Start a PCI IDE BMDMA transaction
+ *	@qc: Info associated with this ATA transaction.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+static void ata_bmdma_start_mmio (struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
+	u8 dmactl;
+
+	/* start host DMA transaction */
+	dmactl = readb(mmio + ATA_DMA_CMD);
+	writeb(dmactl | ATA_DMA_START, mmio + ATA_DMA_CMD);
+
+	/* Strictly, one may wish to issue a readb() here, to
+	 * flush the mmio write.  However, control also passes
+	 * to the hardware at this point, and it will interrupt
+	 * us when we are to resume control.  So, in effect,
+	 * we don't care when the mmio write flushes.
+	 * Further, a read of the DMA status register _immediately_
+	 * following the write may not be what certain flaky hardware
+	 * is expected, so I think it is best to not add a readb()
+	 * without first all the MMIO ATA cards/mobos.
+	 * Or maybe I'm just being paranoid.
+	 */
+}
+
+/**
+ *	ata_bmdma_setup_pio - Set up PCI IDE BMDMA transaction (PIO)
+ *	@qc: Info associated with this ATA transaction.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+static void ata_bmdma_setup_pio (struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
+	u8 dmactl;
+
+	/* load PRD table addr. */
+	outl(ap->prd_dma, ap->ioaddr.bmdma_addr + ATA_DMA_TABLE_OFS);
+
+	/* specify data direction, triple-check start bit is clear */
+	dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
+	dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
+	if (!rw)
+		dmactl |= ATA_DMA_WR;
+	outb(dmactl, ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
+
+	/* issue r/w command */
+	ap->ops->exec_command(ap, &qc->tf);
+}
+
+/**
+ *	ata_bmdma_start_pio - Start a PCI IDE BMDMA transaction (PIO)
+ *	@qc: Info associated with this ATA transaction.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+static void ata_bmdma_start_pio (struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	u8 dmactl;
+
+	/* start host DMA transaction */
+	dmactl = inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
+	outb(dmactl | ATA_DMA_START,
+	     ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
+}
+
+
+/**
+ *	ata_bmdma_start - Start a PCI IDE BMDMA transaction
+ *	@qc: Info associated with this ATA transaction.
+ *
+ *	Writes the ATA_DMA_START flag to the DMA command register.
+ *
+ *	May be used as the bmdma_start() entry in ata_port_operations.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+void ata_bmdma_start(struct ata_queued_cmd *qc)
+{
+	if (qc->ap->flags & ATA_FLAG_MMIO)
+		ata_bmdma_start_mmio(qc);
+	else
+		ata_bmdma_start_pio(qc);
+}
+
+
+/**
+ *	ata_bmdma_setup - Set up PCI IDE BMDMA transaction
+ *	@qc: Info associated with this ATA transaction.
+ *
+ *	Writes address of PRD table to device's PRD Table Address
+ *	register, sets the DMA control register, and calls
+ *	ops->exec_command() to start the transfer.
+ *
+ *	May be used as the bmdma_setup() entry in ata_port_operations.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+void ata_bmdma_setup(struct ata_queued_cmd *qc)
+{
+	if (qc->ap->flags & ATA_FLAG_MMIO)
+		ata_bmdma_setup_mmio(qc);
+	else
+		ata_bmdma_setup_pio(qc);
+}
+
+
+/**
+ *	ata_bmdma_irq_clear - Clear PCI IDE BMDMA interrupt.
+ *	@ap: Port associated with this ATA transaction.
+ *
+ *	Clear interrupt and error flags in DMA status register.
+ *
+ *	May be used as the irq_clear() entry in ata_port_operations.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+void ata_bmdma_irq_clear(struct ata_port *ap)
+{
+	if (!ap->ioaddr.bmdma_addr)
+		return;
+
+	if (ap->flags & ATA_FLAG_MMIO) {
+		void __iomem *mmio =
+		      ((void __iomem *) ap->ioaddr.bmdma_addr) + ATA_DMA_STATUS;
+		writeb(readb(mmio), mmio);
+	} else {
+		unsigned long addr = ap->ioaddr.bmdma_addr + ATA_DMA_STATUS;
+		outb(inb(addr), addr);
+	}
+}
+
+
+/**
+ *	ata_bmdma_status - Read PCI IDE BMDMA status
+ *	@ap: Port associated with this ATA transaction.
+ *
+ *	Read and return BMDMA status register.
+ *
+ *	May be used as the bmdma_status() entry in ata_port_operations.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+u8 ata_bmdma_status(struct ata_port *ap)
+{
+	u8 host_stat;
+	if (ap->flags & ATA_FLAG_MMIO) {
+		void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
+		host_stat = readb(mmio + ATA_DMA_STATUS);
+	} else
+		host_stat = inb(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS);
+	return host_stat;
+}
+
+
+/**
+ *	ata_bmdma_stop - Stop PCI IDE BMDMA transfer
+ *	@qc: Command we are ending DMA for
+ *
+ *	Clears the ATA_DMA_START flag in the dma control register
+ *
+ *	May be used as the bmdma_stop() entry in ata_port_operations.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+void ata_bmdma_stop(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	if (ap->flags & ATA_FLAG_MMIO) {
+		void __iomem *mmio = (void __iomem *) ap->ioaddr.bmdma_addr;
+
+		/* clear start/stop bit */
+		writeb(readb(mmio + ATA_DMA_CMD) & ~ATA_DMA_START,
+			mmio + ATA_DMA_CMD);
+	} else {
+		/* clear start/stop bit */
+		outb(inb(ap->ioaddr.bmdma_addr + ATA_DMA_CMD) & ~ATA_DMA_START,
+			ap->ioaddr.bmdma_addr + ATA_DMA_CMD);
+	}
+
+	/* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */
+	ata_altstatus(ap);        /* dummy read */
+}
+
+/**
+ *	ata_bmdma_freeze - Freeze BMDMA controller port
+ *	@ap: port to freeze
+ *
+ *	Freeze BMDMA controller port.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+void ata_bmdma_freeze(struct ata_port *ap)
+{
+	struct ata_ioports *ioaddr = &ap->ioaddr;
+
+	ap->ctl |= ATA_NIEN;
+	ap->last_ctl = ap->ctl;
+
+	if (ap->flags & ATA_FLAG_MMIO)
+		writeb(ap->ctl, (void __iomem *)ioaddr->ctl_addr);
+	else
+		outb(ap->ctl, ioaddr->ctl_addr);
+}
+
+/**
+ *	ata_bmdma_thaw - Thaw BMDMA controller port
+ *	@ap: port to thaw
+ *
+ *	Thaw BMDMA controller port.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+void ata_bmdma_thaw(struct ata_port *ap)
+{
+	/* clear & re-enable interrupts */
+	ata_chk_status(ap);
+	ap->ops->irq_clear(ap);
+	if (ap->ioaddr.ctl_addr)	/* FIXME: hack. create a hook instead */
+		ata_irq_on(ap);
+}
+
+/**
+ *	ata_bmdma_drive_eh - Perform EH with given methods for BMDMA controller
+ *	@ap: port to handle error for
+ *	@prereset: prereset method (can be NULL)
+ *	@softreset: softreset method (can be NULL)
+ *	@hardreset: hardreset method (can be NULL)
+ *	@postreset: postreset method (can be NULL)
+ *
+ *	Handle error for ATA BMDMA controller.  It can handle both
+ *	PATA and SATA controllers.  Many controllers should be able to
+ *	use this EH as-is or with some added handling before and
+ *	after.
+ *
+ *	This function is intended to be used for constructing
+ *	->error_handler callback by low level drivers.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ */
+void ata_bmdma_drive_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
+			ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
+			ata_postreset_fn_t postreset)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+	struct ata_queued_cmd *qc;
+	unsigned long flags;
+	int thaw = 0;
+
+	qc = __ata_qc_from_tag(ap, ap->active_tag);
+	if (qc && !(qc->flags & ATA_QCFLAG_FAILED))
+		qc = NULL;
+
+	/* reset PIO HSM and stop DMA engine */
+	spin_lock_irqsave(ap->lock, flags);
+
+	ap->hsm_task_state = HSM_ST_IDLE;
+
+	if (qc && (qc->tf.protocol == ATA_PROT_DMA ||
+		   qc->tf.protocol == ATA_PROT_ATAPI_DMA)) {
+		u8 host_stat;
+
+		host_stat = ata_bmdma_status(ap);
+
+		ata_ehi_push_desc(&ehc->i, "BMDMA stat 0x%x", host_stat);
+
+		/* BMDMA controllers indicate host bus error by
+		 * setting DMA_ERR bit and timing out.  As it wasn't
+		 * really a timeout event, adjust error mask and
+		 * cancel frozen state.
+		 */
+		if (qc->err_mask == AC_ERR_TIMEOUT && host_stat & ATA_DMA_ERR) {
+			qc->err_mask = AC_ERR_HOST_BUS;
+			thaw = 1;
+		}
+
+		ap->ops->bmdma_stop(qc);
+	}
+
+	ata_altstatus(ap);
+	ata_chk_status(ap);
+	ap->ops->irq_clear(ap);
+
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	if (thaw)
+		ata_eh_thaw_port(ap);
+
+	/* PIO and DMA engines have been stopped, perform recovery */
+	ata_do_eh(ap, prereset, softreset, hardreset, postreset);
+}
+
+/**
+ *	ata_bmdma_error_handler - Stock error handler for BMDMA controller
+ *	@ap: port to handle error for
+ *
+ *	Stock error handler for BMDMA controller.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ */
+void ata_bmdma_error_handler(struct ata_port *ap)
+{
+	ata_reset_fn_t hardreset;
+
+	hardreset = NULL;
+	if (sata_scr_valid(ap))
+		hardreset = sata_std_hardreset;
+
+	ata_bmdma_drive_eh(ap, ata_std_prereset, ata_std_softreset, hardreset,
+			   ata_std_postreset);
+}
+
+/**
+ *	ata_bmdma_post_internal_cmd - Stock post_internal_cmd for
+ *				      BMDMA controller
+ *	@qc: internal command to clean up
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ */
+void ata_bmdma_post_internal_cmd(struct ata_queued_cmd *qc)
+{
+	ata_bmdma_stop(qc);
+}
+
+#ifdef CONFIG_PCI
+/**
+ *	ata_pci_init_native_mode - Initialize native-mode driver
+ *	@pdev:  pci device to be initialized
+ *	@port:  array[2] of pointers to port info structures.
+ *	@ports: bitmap of ports present
+ *
+ *	Utility function which allocates and initializes an
+ *	ata_probe_ent structure for a standard dual-port
+ *	PIO-based IDE controller.  The returned ata_probe_ent
+ *	structure can be passed to ata_device_add().  The returned
+ *	ata_probe_ent structure should then be freed with kfree().
+ *
+ *	The caller need only pass the address of the primary port, the
+ *	secondary will be deduced automatically. If the device has non
+ *	standard secondary port mappings this function can be called twice,
+ *	once for each interface.
+ */
+
+struct ata_probe_ent *
+ata_pci_init_native_mode(struct pci_dev *pdev, struct ata_port_info **port, int ports)
+{
+	struct ata_probe_ent *probe_ent =
+		ata_probe_ent_alloc(pci_dev_to_dev(pdev), port[0]);
+	int p = 0;
+	unsigned long bmdma;
+
+	if (!probe_ent)
+		return NULL;
+
+	probe_ent->irq = pdev->irq;
+	probe_ent->irq_flags = IRQF_SHARED;
+	probe_ent->private_data = port[0]->private_data;
+
+	if (ports & ATA_PORT_PRIMARY) {
+		probe_ent->port[p].cmd_addr = pci_resource_start(pdev, 0);
+		probe_ent->port[p].altstatus_addr =
+		probe_ent->port[p].ctl_addr =
+			pci_resource_start(pdev, 1) | ATA_PCI_CTL_OFS;
+		bmdma = pci_resource_start(pdev, 4);
+		if (bmdma) {
+			if (inb(bmdma + 2) & 0x80)
+				probe_ent->host_set_flags |= ATA_HOST_SIMPLEX;
+			probe_ent->port[p].bmdma_addr = bmdma;
+		}
+		ata_std_ports(&probe_ent->port[p]);
+		p++;
+	}
+
+	if (ports & ATA_PORT_SECONDARY) {
+		probe_ent->port[p].cmd_addr = pci_resource_start(pdev, 2);
+		probe_ent->port[p].altstatus_addr =
+		probe_ent->port[p].ctl_addr =
+			pci_resource_start(pdev, 3) | ATA_PCI_CTL_OFS;
+		bmdma = pci_resource_start(pdev, 4);
+		if (bmdma) {
+			bmdma += 8;
+			if(inb(bmdma + 2) & 0x80)
+				probe_ent->host_set_flags |= ATA_HOST_SIMPLEX;
+			probe_ent->port[p].bmdma_addr = bmdma;
+		}
+		ata_std_ports(&probe_ent->port[p]);
+		p++;
+	}
+
+	probe_ent->n_ports = p;
+	return probe_ent;
+}
+
+
+static struct ata_probe_ent *ata_pci_init_legacy_port(struct pci_dev *pdev,
+				struct ata_port_info **port, int port_mask)
+{
+	struct ata_probe_ent *probe_ent;
+	unsigned long bmdma = pci_resource_start(pdev, 4);
+
+	probe_ent = ata_probe_ent_alloc(pci_dev_to_dev(pdev), port[0]);
+	if (!probe_ent)
+		return NULL;
+
+	probe_ent->n_ports = 2;
+	probe_ent->private_data = port[0]->private_data;
+
+	if (port_mask & ATA_PORT_PRIMARY) {
+		probe_ent->irq = 14;
+		probe_ent->port[0].cmd_addr = ATA_PRIMARY_CMD;
+		probe_ent->port[0].altstatus_addr =
+		probe_ent->port[0].ctl_addr = ATA_PRIMARY_CTL;
+		if (bmdma) {
+			probe_ent->port[0].bmdma_addr = bmdma;
+			if (inb(bmdma + 2) & 0x80)
+				probe_ent->host_set_flags |= ATA_HOST_SIMPLEX;
+		}
+		ata_std_ports(&probe_ent->port[0]);
+	} else
+		probe_ent->dummy_port_mask |= ATA_PORT_PRIMARY;
+
+	if (port_mask & ATA_PORT_SECONDARY) {
+		if (probe_ent->irq)
+			probe_ent->irq2 = 15;
+		else
+			probe_ent->irq = 15;
+		probe_ent->port[1].cmd_addr = ATA_SECONDARY_CMD;
+		probe_ent->port[1].altstatus_addr =
+		probe_ent->port[1].ctl_addr = ATA_SECONDARY_CTL;
+		if (bmdma) {
+			probe_ent->port[1].bmdma_addr = bmdma + 8;
+			if (inb(bmdma + 10) & 0x80)
+				probe_ent->host_set_flags |= ATA_HOST_SIMPLEX;
+		}
+		ata_std_ports(&probe_ent->port[1]);
+	} else
+		probe_ent->dummy_port_mask |= ATA_PORT_SECONDARY;
+
+	return probe_ent;
+}
+
+
+/**
+ *	ata_pci_init_one - Initialize/register PCI IDE host controller
+ *	@pdev: Controller to be initialized
+ *	@port_info: Information from low-level host driver
+ *	@n_ports: Number of ports attached to host controller
+ *
+ *	This is a helper function which can be called from a driver's
+ *	xxx_init_one() probe function if the hardware uses traditional
+ *	IDE taskfile registers.
+ *
+ *	This function calls pci_enable_device(), reserves its register
+ *	regions, sets the dma mask, enables bus master mode, and calls
+ *	ata_device_add()
+ *
+ *	ASSUMPTION:
+ *	Nobody makes a single channel controller that appears solely as
+ *	the secondary legacy port on PCI.
+ *
+ *	LOCKING:
+ *	Inherited from PCI layer (may sleep).
+ *
+ *	RETURNS:
+ *	Zero on success, negative on errno-based value on error.
+ */
+
+int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
+		      unsigned int n_ports)
+{
+	struct ata_probe_ent *probe_ent = NULL;
+	struct ata_port_info *port[2];
+	u8 tmp8, mask;
+	unsigned int legacy_mode = 0;
+	int disable_dev_on_err = 1;
+	int rc;
+
+	DPRINTK("ENTER\n");
+
+	port[0] = port_info[0];
+	if (n_ports > 1)
+		port[1] = port_info[1];
+	else
+		port[1] = port[0];
+
+	if ((port[0]->host_flags & ATA_FLAG_NO_LEGACY) == 0
+	    && (pdev->class >> 8) == PCI_CLASS_STORAGE_IDE) {
+		/* TODO: What if one channel is in native mode ... */
+		pci_read_config_byte(pdev, PCI_CLASS_PROG, &tmp8);
+		mask = (1 << 2) | (1 << 0);
+		if ((tmp8 & mask) != mask)
+			legacy_mode = (1 << 3);
+	}
+
+	/* FIXME... */
+	if ((!legacy_mode) && (n_ports > 2)) {
+		printk(KERN_ERR "ata: BUG: native mode, n_ports > 2\n");
+		n_ports = 2;
+		/* For now */
+	}
+
+	/* FIXME: Really for ATA it isn't safe because the device may be
+	   multi-purpose and we want to leave it alone if it was already
+	   enabled. Secondly for shared use as Arjan says we want refcounting
+
+	   Checking dev->is_enabled is insufficient as this is not set at
+	   boot for the primary video which is BIOS enabled
+         */
+
+	rc = pci_enable_device(pdev);
+	if (rc)
+		return rc;
+
+	rc = pci_request_regions(pdev, DRV_NAME);
+	if (rc) {
+		disable_dev_on_err = 0;
+		goto err_out;
+	}
+
+	if (legacy_mode) {
+		if (!request_region(ATA_PRIMARY_CMD, 8, "libata")) {
+			struct resource *conflict, res;
+			res.start = ATA_PRIMARY_CMD;
+			res.end = ATA_PRIMARY_CMD + 8 - 1;
+			conflict = ____request_resource(&ioport_resource, &res);
+			if (!strcmp(conflict->name, "libata"))
+				legacy_mode |= ATA_PORT_PRIMARY;
+			else {
+				disable_dev_on_err = 0;
+				printk(KERN_WARNING "ata: 0x%0X IDE port busy\n", ATA_PRIMARY_CMD);
+			}
+		} else
+			legacy_mode |= ATA_PORT_PRIMARY;
+
+		if (!request_region(ATA_SECONDARY_CMD, 8, "libata")) {
+			struct resource *conflict, res;
+			res.start = ATA_SECONDARY_CMD;
+			res.end = ATA_SECONDARY_CMD + 8 - 1;
+			conflict = ____request_resource(&ioport_resource, &res);
+			if (!strcmp(conflict->name, "libata"))
+				legacy_mode |= ATA_PORT_SECONDARY;
+			else {
+				disable_dev_on_err = 0;
+				printk(KERN_WARNING "ata: 0x%X IDE port busy\n", ATA_SECONDARY_CMD);
+			}
+		} else
+			legacy_mode |= ATA_PORT_SECONDARY;
+	}
+
+	/* we have legacy mode, but all ports are unavailable */
+	if (legacy_mode == (1 << 3)) {
+		rc = -EBUSY;
+		goto err_out_regions;
+	}
+
+	/* FIXME: If we get no DMA mask we should fall back to PIO */
+	rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
+	if (rc)
+		goto err_out_regions;
+	rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
+	if (rc)
+		goto err_out_regions;
+
+	if (legacy_mode) {
+		probe_ent = ata_pci_init_legacy_port(pdev, port, legacy_mode);
+	} else {
+		if (n_ports == 2)
+			probe_ent = ata_pci_init_native_mode(pdev, port, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
+		else
+			probe_ent = ata_pci_init_native_mode(pdev, port, ATA_PORT_PRIMARY);
+	}
+	if (!probe_ent) {
+		rc = -ENOMEM;
+		goto err_out_regions;
+	}
+
+	pci_set_master(pdev);
+
+	/* FIXME: check ata_device_add return */
+	ata_device_add(probe_ent);
+
+	kfree(probe_ent);
+
+	return 0;
+
+err_out_regions:
+	if (legacy_mode & ATA_PORT_PRIMARY)
+		release_region(ATA_PRIMARY_CMD, 8);
+	if (legacy_mode & ATA_PORT_SECONDARY)
+		release_region(ATA_SECONDARY_CMD, 8);
+	pci_release_regions(pdev);
+err_out:
+	if (disable_dev_on_err)
+		pci_disable_device(pdev);
+	return rc;
+}
+
+/**
+ *	ata_pci_clear_simplex	-	attempt to kick device out of simplex
+ *	@pdev: PCI device
+ *
+ *	Some PCI ATA devices report simplex mode but in fact can be told to
+ *	enter non simplex mode. This implements the neccessary logic to
+ *	perform the task on such devices. Calling it on other devices will
+ *	have -undefined- behaviour.
+ */
+
+int ata_pci_clear_simplex(struct pci_dev *pdev)
+{
+	unsigned long bmdma = pci_resource_start(pdev, 4);
+	u8 simplex;
+
+	if (bmdma == 0)
+		return -ENOENT;
+
+	simplex = inb(bmdma + 0x02);
+	outb(simplex & 0x60, bmdma + 0x02);
+	simplex = inb(bmdma + 0x02);
+	if (simplex & 0x80)
+		return -EOPNOTSUPP;
+	return 0;
+}
+
+unsigned long ata_pci_default_filter(const struct ata_port *ap, struct ata_device *adev, unsigned long xfer_mask)
+{
+	/* Filter out DMA modes if the device has been configured by
+	   the BIOS as PIO only */
+
+	if (ap->ioaddr.bmdma_addr == 0)
+		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
+	return xfer_mask;
+}
+
+#endif /* CONFIG_PCI */
+
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
new file mode 100644
index 0000000..7d786fb
--- /dev/null
+++ b/drivers/ata/libata-core.c
@@ -0,0 +1,6097 @@
+/*
+ *  libata-core.c - helper library for ATA
+ *
+ *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
+ *    		    Please ALWAYS copy linux-ide@vger.kernel.org
+ *		    on emails.
+ *
+ *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
+ *  Copyright 2003-2004 Jeff Garzik
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ *  libata documentation is available via 'make {ps|pdf}docs',
+ *  as Documentation/DocBook/libata.*
+ *
+ *  Hardware documentation available from http://www.t13.org/ and
+ *  http://www.sata-io.org/
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/mm.h>
+#include <linux/highmem.h>
+#include <linux/spinlock.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/completion.h>
+#include <linux/suspend.h>
+#include <linux/workqueue.h>
+#include <linux/jiffies.h>
+#include <linux/scatterlist.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+#include <asm/io.h>
+#include <asm/semaphore.h>
+#include <asm/byteorder.h>
+
+#include "libata.h"
+
+/* debounce timing parameters in msecs { interval, duration, timeout } */
+const unsigned long sata_deb_timing_normal[]		= {   5,  100, 2000 };
+const unsigned long sata_deb_timing_hotplug[]		= {  25,  500, 2000 };
+const unsigned long sata_deb_timing_long[]		= { 100, 2000, 5000 };
+
+static unsigned int ata_dev_init_params(struct ata_device *dev,
+					u16 heads, u16 sectors);
+static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
+static void ata_dev_xfermask(struct ata_device *dev);
+
+static unsigned int ata_unique_id = 1;
+static struct workqueue_struct *ata_wq;
+
+struct workqueue_struct *ata_aux_wq;
+
+int atapi_enabled = 1;
+module_param(atapi_enabled, int, 0444);
+MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
+
+int atapi_dmadir = 0;
+module_param(atapi_dmadir, int, 0444);
+MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
+
+int libata_fua = 0;
+module_param_named(fua, libata_fua, int, 0444);
+MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
+
+static int ata_probe_timeout = ATA_TMOUT_INTERNAL / HZ;
+module_param(ata_probe_timeout, int, 0444);
+MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
+
+MODULE_AUTHOR("Jeff Garzik");
+MODULE_DESCRIPTION("Library module for ATA devices");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+
+
+/**
+ *	ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
+ *	@tf: Taskfile to convert
+ *	@fis: Buffer into which data will output
+ *	@pmp: Port multiplier port
+ *
+ *	Converts a standard ATA taskfile to a Serial ATA
+ *	FIS structure (Register - Host to Device).
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+
+void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp)
+{
+	fis[0] = 0x27;	/* Register - Host to Device FIS */
+	fis[1] = (pmp & 0xf) | (1 << 7); /* Port multiplier number,
+					    bit 7 indicates Command FIS */
+	fis[2] = tf->command;
+	fis[3] = tf->feature;
+
+	fis[4] = tf->lbal;
+	fis[5] = tf->lbam;
+	fis[6] = tf->lbah;
+	fis[7] = tf->device;
+
+	fis[8] = tf->hob_lbal;
+	fis[9] = tf->hob_lbam;
+	fis[10] = tf->hob_lbah;
+	fis[11] = tf->hob_feature;
+
+	fis[12] = tf->nsect;
+	fis[13] = tf->hob_nsect;
+	fis[14] = 0;
+	fis[15] = tf->ctl;
+
+	fis[16] = 0;
+	fis[17] = 0;
+	fis[18] = 0;
+	fis[19] = 0;
+}
+
+/**
+ *	ata_tf_from_fis - Convert SATA FIS to ATA taskfile
+ *	@fis: Buffer from which data will be input
+ *	@tf: Taskfile to output
+ *
+ *	Converts a serial ATA FIS structure to a standard ATA taskfile.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+
+void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
+{
+	tf->command	= fis[2];	/* status */
+	tf->feature	= fis[3];	/* error */
+
+	tf->lbal	= fis[4];
+	tf->lbam	= fis[5];
+	tf->lbah	= fis[6];
+	tf->device	= fis[7];
+
+	tf->hob_lbal	= fis[8];
+	tf->hob_lbam	= fis[9];
+	tf->hob_lbah	= fis[10];
+
+	tf->nsect	= fis[12];
+	tf->hob_nsect	= fis[13];
+}
+
+static const u8 ata_rw_cmds[] = {
+	/* pio multi */
+	ATA_CMD_READ_MULTI,
+	ATA_CMD_WRITE_MULTI,
+	ATA_CMD_READ_MULTI_EXT,
+	ATA_CMD_WRITE_MULTI_EXT,
+	0,
+	0,
+	0,
+	ATA_CMD_WRITE_MULTI_FUA_EXT,
+	/* pio */
+	ATA_CMD_PIO_READ,
+	ATA_CMD_PIO_WRITE,
+	ATA_CMD_PIO_READ_EXT,
+	ATA_CMD_PIO_WRITE_EXT,
+	0,
+	0,
+	0,
+	0,
+	/* dma */
+	ATA_CMD_READ,
+	ATA_CMD_WRITE,
+	ATA_CMD_READ_EXT,
+	ATA_CMD_WRITE_EXT,
+	0,
+	0,
+	0,
+	ATA_CMD_WRITE_FUA_EXT
+};
+
+/**
+ *	ata_rwcmd_protocol - set taskfile r/w commands and protocol
+ *	@qc: command to examine and configure
+ *
+ *	Examine the device configuration and tf->flags to calculate
+ *	the proper read/write commands and protocol to use.
+ *
+ *	LOCKING:
+ *	caller.
+ */
+int ata_rwcmd_protocol(struct ata_queued_cmd *qc)
+{
+	struct ata_taskfile *tf = &qc->tf;
+	struct ata_device *dev = qc->dev;
+	u8 cmd;
+
+	int index, fua, lba48, write;
+
+	fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
+	lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
+	write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
+
+	if (dev->flags & ATA_DFLAG_PIO) {
+		tf->protocol = ATA_PROT_PIO;
+		index = dev->multi_count ? 0 : 8;
+	} else if (lba48 && (qc->ap->flags & ATA_FLAG_PIO_LBA48)) {
+		/* Unable to use DMA due to host limitation */
+		tf->protocol = ATA_PROT_PIO;
+		index = dev->multi_count ? 0 : 8;
+	} else {
+		tf->protocol = ATA_PROT_DMA;
+		index = 16;
+	}
+
+	cmd = ata_rw_cmds[index + fua + lba48 + write];
+	if (cmd) {
+		tf->command = cmd;
+		return 0;
+	}
+	return -1;
+}
+
+/**
+ *	ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
+ *	@pio_mask: pio_mask
+ *	@mwdma_mask: mwdma_mask
+ *	@udma_mask: udma_mask
+ *
+ *	Pack @pio_mask, @mwdma_mask and @udma_mask into a single
+ *	unsigned int xfer_mask.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	Packed xfer_mask.
+ */
+static unsigned int ata_pack_xfermask(unsigned int pio_mask,
+				      unsigned int mwdma_mask,
+				      unsigned int udma_mask)
+{
+	return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
+		((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
+		((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
+}
+
+/**
+ *	ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
+ *	@xfer_mask: xfer_mask to unpack
+ *	@pio_mask: resulting pio_mask
+ *	@mwdma_mask: resulting mwdma_mask
+ *	@udma_mask: resulting udma_mask
+ *
+ *	Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
+ *	Any NULL distination masks will be ignored.
+ */
+static void ata_unpack_xfermask(unsigned int xfer_mask,
+				unsigned int *pio_mask,
+				unsigned int *mwdma_mask,
+				unsigned int *udma_mask)
+{
+	if (pio_mask)
+		*pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
+	if (mwdma_mask)
+		*mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
+	if (udma_mask)
+		*udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
+}
+
+static const struct ata_xfer_ent {
+	int shift, bits;
+	u8 base;
+} ata_xfer_tbl[] = {
+	{ ATA_SHIFT_PIO, ATA_BITS_PIO, XFER_PIO_0 },
+	{ ATA_SHIFT_MWDMA, ATA_BITS_MWDMA, XFER_MW_DMA_0 },
+	{ ATA_SHIFT_UDMA, ATA_BITS_UDMA, XFER_UDMA_0 },
+	{ -1, },
+};
+
+/**
+ *	ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
+ *	@xfer_mask: xfer_mask of interest
+ *
+ *	Return matching XFER_* value for @xfer_mask.  Only the highest
+ *	bit of @xfer_mask is considered.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	Matching XFER_* value, 0 if no match found.
+ */
+static u8 ata_xfer_mask2mode(unsigned int xfer_mask)
+{
+	int highbit = fls(xfer_mask) - 1;
+	const struct ata_xfer_ent *ent;
+
+	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
+		if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
+			return ent->base + highbit - ent->shift;
+	return 0;
+}
+
+/**
+ *	ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
+ *	@xfer_mode: XFER_* of interest
+ *
+ *	Return matching xfer_mask for @xfer_mode.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	Matching xfer_mask, 0 if no match found.
+ */
+static unsigned int ata_xfer_mode2mask(u8 xfer_mode)
+{
+	const struct ata_xfer_ent *ent;
+
+	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
+		if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
+			return 1 << (ent->shift + xfer_mode - ent->base);
+	return 0;
+}
+
+/**
+ *	ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
+ *	@xfer_mode: XFER_* of interest
+ *
+ *	Return matching xfer_shift for @xfer_mode.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	Matching xfer_shift, -1 if no match found.
+ */
+static int ata_xfer_mode2shift(unsigned int xfer_mode)
+{
+	const struct ata_xfer_ent *ent;
+
+	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
+		if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
+			return ent->shift;
+	return -1;
+}
+
+/**
+ *	ata_mode_string - convert xfer_mask to string
+ *	@xfer_mask: mask of bits supported; only highest bit counts.
+ *
+ *	Determine string which represents the highest speed
+ *	(highest bit in @modemask).
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	Constant C string representing highest speed listed in
+ *	@mode_mask, or the constant C string "<n/a>".
+ */
+static const char *ata_mode_string(unsigned int xfer_mask)
+{
+	static const char * const xfer_mode_str[] = {
+		"PIO0",
+		"PIO1",
+		"PIO2",
+		"PIO3",
+		"PIO4",
+		"MWDMA0",
+		"MWDMA1",
+		"MWDMA2",
+		"UDMA/16",
+		"UDMA/25",
+		"UDMA/33",
+		"UDMA/44",
+		"UDMA/66",
+		"UDMA/100",
+		"UDMA/133",
+		"UDMA7",
+	};
+	int highbit;
+
+	highbit = fls(xfer_mask) - 1;
+	if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
+		return xfer_mode_str[highbit];
+	return "<n/a>";
+}
+
+static const char *sata_spd_string(unsigned int spd)
+{
+	static const char * const spd_str[] = {
+		"1.5 Gbps",
+		"3.0 Gbps",
+	};
+
+	if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
+		return "<unknown>";
+	return spd_str[spd - 1];
+}
+
+void ata_dev_disable(struct ata_device *dev)
+{
+	if (ata_dev_enabled(dev) && ata_msg_drv(dev->ap)) {
+		ata_dev_printk(dev, KERN_WARNING, "disabled\n");
+		dev->class++;
+	}
+}
+
+/**
+ *	ata_pio_devchk - PATA device presence detection
+ *	@ap: ATA channel to examine
+ *	@device: Device to examine (starting at zero)
+ *
+ *	This technique was originally described in
+ *	Hale Landis's ATADRVR (www.ata-atapi.com), and
+ *	later found its way into the ATA/ATAPI spec.
+ *
+ *	Write a pattern to the ATA shadow registers,
+ *	and if a device is present, it will respond by
+ *	correctly storing and echoing back the
+ *	ATA shadow register contents.
+ *
+ *	LOCKING:
+ *	caller.
+ */
+
+static unsigned int ata_pio_devchk(struct ata_port *ap,
+				   unsigned int device)
+{
+	struct ata_ioports *ioaddr = &ap->ioaddr;
+	u8 nsect, lbal;
+
+	ap->ops->dev_select(ap, device);
+
+	outb(0x55, ioaddr->nsect_addr);
+	outb(0xaa, ioaddr->lbal_addr);
+
+	outb(0xaa, ioaddr->nsect_addr);
+	outb(0x55, ioaddr->lbal_addr);
+
+	outb(0x55, ioaddr->nsect_addr);
+	outb(0xaa, ioaddr->lbal_addr);
+
+	nsect = inb(ioaddr->nsect_addr);
+	lbal = inb(ioaddr->lbal_addr);
+
+	if ((nsect == 0x55) && (lbal == 0xaa))
+		return 1;	/* we found a device */
+
+	return 0;		/* nothing found */
+}
+
+/**
+ *	ata_mmio_devchk - PATA device presence detection
+ *	@ap: ATA channel to examine
+ *	@device: Device to examine (starting at zero)
+ *
+ *	This technique was originally described in
+ *	Hale Landis's ATADRVR (www.ata-atapi.com), and
+ *	later found its way into the ATA/ATAPI spec.
+ *
+ *	Write a pattern to the ATA shadow registers,
+ *	and if a device is present, it will respond by
+ *	correctly storing and echoing back the
+ *	ATA shadow register contents.
+ *
+ *	LOCKING:
+ *	caller.
+ */
+
+static unsigned int ata_mmio_devchk(struct ata_port *ap,
+				    unsigned int device)
+{
+	struct ata_ioports *ioaddr = &ap->ioaddr;
+	u8 nsect, lbal;
+
+	ap->ops->dev_select(ap, device);
+
+	writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
+	writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
+
+	writeb(0xaa, (void __iomem *) ioaddr->nsect_addr);
+	writeb(0x55, (void __iomem *) ioaddr->lbal_addr);
+
+	writeb(0x55, (void __iomem *) ioaddr->nsect_addr);
+	writeb(0xaa, (void __iomem *) ioaddr->lbal_addr);
+
+	nsect = readb((void __iomem *) ioaddr->nsect_addr);
+	lbal = readb((void __iomem *) ioaddr->lbal_addr);
+
+	if ((nsect == 0x55) && (lbal == 0xaa))
+		return 1;	/* we found a device */
+
+	return 0;		/* nothing found */
+}
+
+/**
+ *	ata_devchk - PATA device presence detection
+ *	@ap: ATA channel to examine
+ *	@device: Device to examine (starting at zero)
+ *
+ *	Dispatch ATA device presence detection, depending
+ *	on whether we are using PIO or MMIO to talk to the
+ *	ATA shadow registers.
+ *
+ *	LOCKING:
+ *	caller.
+ */
+
+static unsigned int ata_devchk(struct ata_port *ap,
+				    unsigned int device)
+{
+	if (ap->flags & ATA_FLAG_MMIO)
+		return ata_mmio_devchk(ap, device);
+	return ata_pio_devchk(ap, device);
+}
+
+/**
+ *	ata_dev_classify - determine device type based on ATA-spec signature
+ *	@tf: ATA taskfile register set for device to be identified
+ *
+ *	Determine from taskfile register contents whether a device is
+ *	ATA or ATAPI, as per "Signature and persistence" section
+ *	of ATA/PI spec (volume 1, sect 5.14).
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, or %ATA_DEV_UNKNOWN
+ *	the event of failure.
+ */
+
+unsigned int ata_dev_classify(const struct ata_taskfile *tf)
+{
+	/* Apple's open source Darwin code hints that some devices only
+	 * put a proper signature into the LBA mid/high registers,
+	 * So, we only check those.  It's sufficient for uniqueness.
+	 */
+
+	if (((tf->lbam == 0) && (tf->lbah == 0)) ||
+	    ((tf->lbam == 0x3c) && (tf->lbah == 0xc3))) {
+		DPRINTK("found ATA device by sig\n");
+		return ATA_DEV_ATA;
+	}
+
+	if (((tf->lbam == 0x14) && (tf->lbah == 0xeb)) ||
+	    ((tf->lbam == 0x69) && (tf->lbah == 0x96))) {
+		DPRINTK("found ATAPI device by sig\n");
+		return ATA_DEV_ATAPI;
+	}
+
+	DPRINTK("unknown device\n");
+	return ATA_DEV_UNKNOWN;
+}
+
+/**
+ *	ata_dev_try_classify - Parse returned ATA device signature
+ *	@ap: ATA channel to examine
+ *	@device: Device to examine (starting at zero)
+ *	@r_err: Value of error register on completion
+ *
+ *	After an event -- SRST, E.D.D., or SATA COMRESET -- occurs,
+ *	an ATA/ATAPI-defined set of values is placed in the ATA
+ *	shadow registers, indicating the results of device detection
+ *	and diagnostics.
+ *
+ *	Select the ATA device, and read the values from the ATA shadow
+ *	registers.  Then parse according to the Error register value,
+ *	and the spec-defined values examined by ata_dev_classify().
+ *
+ *	LOCKING:
+ *	caller.
+ *
+ *	RETURNS:
+ *	Device type - %ATA_DEV_ATA, %ATA_DEV_ATAPI or %ATA_DEV_NONE.
+ */
+
+static unsigned int
+ata_dev_try_classify(struct ata_port *ap, unsigned int device, u8 *r_err)
+{
+	struct ata_taskfile tf;
+	unsigned int class;
+	u8 err;
+
+	ap->ops->dev_select(ap, device);
+
+	memset(&tf, 0, sizeof(tf));
+
+	ap->ops->tf_read(ap, &tf);
+	err = tf.feature;
+	if (r_err)
+		*r_err = err;
+
+	/* see if device passed diags */
+	if (err == 1)
+		/* do nothing */ ;
+	else if ((device == 0) && (err == 0x81))
+		/* do nothing */ ;
+	else
+		return ATA_DEV_NONE;
+
+	/* determine if device is ATA or ATAPI */
+	class = ata_dev_classify(&tf);
+
+	if (class == ATA_DEV_UNKNOWN)
+		return ATA_DEV_NONE;
+	if ((class == ATA_DEV_ATA) && (ata_chk_status(ap) == 0))
+		return ATA_DEV_NONE;
+	return class;
+}
+
+/**
+ *	ata_id_string - Convert IDENTIFY DEVICE page into string
+ *	@id: IDENTIFY DEVICE results we will examine
+ *	@s: string into which data is output
+ *	@ofs: offset into identify device page
+ *	@len: length of string to return. must be an even number.
+ *
+ *	The strings in the IDENTIFY DEVICE page are broken up into
+ *	16-bit chunks.  Run through the string, and output each
+ *	8-bit chunk linearly, regardless of platform.
+ *
+ *	LOCKING:
+ *	caller.
+ */
+
+void ata_id_string(const u16 *id, unsigned char *s,
+		   unsigned int ofs, unsigned int len)
+{
+	unsigned int c;
+
+	while (len > 0) {
+		c = id[ofs] >> 8;
+		*s = c;
+		s++;
+
+		c = id[ofs] & 0xff;
+		*s = c;
+		s++;
+
+		ofs++;
+		len -= 2;
+	}
+}
+
+/**
+ *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
+ *	@id: IDENTIFY DEVICE results we will examine
+ *	@s: string into which data is output
+ *	@ofs: offset into identify device page
+ *	@len: length of string to return. must be an odd number.
+ *
+ *	This function is identical to ata_id_string except that it
+ *	trims trailing spaces and terminates the resulting string with
+ *	null.  @len must be actual maximum length (even number) + 1.
+ *
+ *	LOCKING:
+ *	caller.
+ */
+void ata_id_c_string(const u16 *id, unsigned char *s,
+		     unsigned int ofs, unsigned int len)
+{
+	unsigned char *p;
+
+	WARN_ON(!(len & 1));
+
+	ata_id_string(id, s, ofs, len - 1);
+
+	p = s + strnlen(s, len - 1);
+	while (p > s && p[-1] == ' ')
+		p--;
+	*p = '\0';
+}
+
+static u64 ata_id_n_sectors(const u16 *id)
+{
+	if (ata_id_has_lba(id)) {
+		if (ata_id_has_lba48(id))
+			return ata_id_u64(id, 100);
+		else
+			return ata_id_u32(id, 60);
+	} else {
+		if (ata_id_current_chs_valid(id))
+			return ata_id_u32(id, 57);
+		else
+			return id[1] * id[3] * id[6];
+	}
+}
+
+/**
+ *	ata_noop_dev_select - Select device 0/1 on ATA bus
+ *	@ap: ATA channel to manipulate
+ *	@device: ATA device (numbered from zero) to select
+ *
+ *	This function performs no actual function.
+ *
+ *	May be used as the dev_select() entry in ata_port_operations.
+ *
+ *	LOCKING:
+ *	caller.
+ */
+void ata_noop_dev_select (struct ata_port *ap, unsigned int device)
+{
+}
+
+
+/**
+ *	ata_std_dev_select - Select device 0/1 on ATA bus
+ *	@ap: ATA channel to manipulate
+ *	@device: ATA device (numbered from zero) to select
+ *
+ *	Use the method defined in the ATA specification to
+ *	make either device 0, or device 1, active on the
+ *	ATA channel.  Works with both PIO and MMIO.
+ *
+ *	May be used as the dev_select() entry in ata_port_operations.
+ *
+ *	LOCKING:
+ *	caller.
+ */
+
+void ata_std_dev_select (struct ata_port *ap, unsigned int device)
+{
+	u8 tmp;
+
+	if (device == 0)
+		tmp = ATA_DEVICE_OBS;
+	else
+		tmp = ATA_DEVICE_OBS | ATA_DEV1;
+
+	if (ap->flags & ATA_FLAG_MMIO) {
+		writeb(tmp, (void __iomem *) ap->ioaddr.device_addr);
+	} else {
+		outb(tmp, ap->ioaddr.device_addr);
+	}
+	ata_pause(ap);		/* needed; also flushes, for mmio */
+}
+
+/**
+ *	ata_dev_select - Select device 0/1 on ATA bus
+ *	@ap: ATA channel to manipulate
+ *	@device: ATA device (numbered from zero) to select
+ *	@wait: non-zero to wait for Status register BSY bit to clear
+ *	@can_sleep: non-zero if context allows sleeping
+ *
+ *	Use the method defined in the ATA specification to
+ *	make either device 0, or device 1, active on the
+ *	ATA channel.
+ *
+ *	This is a high-level version of ata_std_dev_select(),
+ *	which additionally provides the services of inserting
+ *	the proper pauses and status polling, where needed.
+ *
+ *	LOCKING:
+ *	caller.
+ */
+
+void ata_dev_select(struct ata_port *ap, unsigned int device,
+			   unsigned int wait, unsigned int can_sleep)
+{
+	if (ata_msg_probe(ap))
+		ata_port_printk(ap, KERN_INFO, "ata_dev_select: ENTER, ata%u: "
+				"device %u, wait %u\n", ap->id, device, wait);
+
+	if (wait)
+		ata_wait_idle(ap);
+
+	ap->ops->dev_select(ap, device);
+
+	if (wait) {
+		if (can_sleep && ap->device[device].class == ATA_DEV_ATAPI)
+			msleep(150);
+		ata_wait_idle(ap);
+	}
+}
+
+/**
+ *	ata_dump_id - IDENTIFY DEVICE info debugging output
+ *	@id: IDENTIFY DEVICE page to dump
+ *
+ *	Dump selected 16-bit words from the given IDENTIFY DEVICE
+ *	page.
+ *
+ *	LOCKING:
+ *	caller.
+ */
+
+static inline void ata_dump_id(const u16 *id)
+{
+	DPRINTK("49==0x%04x  "
+		"53==0x%04x  "
+		"63==0x%04x  "
+		"64==0x%04x  "
+		"75==0x%04x  \n",
+		id[49],
+		id[53],
+		id[63],
+		id[64],
+		id[75]);
+	DPRINTK("80==0x%04x  "
+		"81==0x%04x  "
+		"82==0x%04x  "
+		"83==0x%04x  "
+		"84==0x%04x  \n",
+		id[80],
+		id[81],
+		id[82],
+		id[83],
+		id[84]);
+	DPRINTK("88==0x%04x  "
+		"93==0x%04x\n",
+		id[88],
+		id[93]);
+}
+
+/**
+ *	ata_id_xfermask - Compute xfermask from the given IDENTIFY data
+ *	@id: IDENTIFY data to compute xfer mask from
+ *
+ *	Compute the xfermask for this device. This is not as trivial
+ *	as it seems if we must consider early devices correctly.
+ *
+ *	FIXME: pre IDE drive timing (do we care ?).
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	Computed xfermask
+ */
+static unsigned int ata_id_xfermask(const u16 *id)
+{
+	unsigned int pio_mask, mwdma_mask, udma_mask;
+
+	/* Usual case. Word 53 indicates word 64 is valid */
+	if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
+		pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
+		pio_mask <<= 3;
+		pio_mask |= 0x7;
+	} else {
+		/* If word 64 isn't valid then Word 51 high byte holds
+		 * the PIO timing number for the maximum. Turn it into
+		 * a mask.
+		 */
+		pio_mask = (2 << (id[ATA_ID_OLD_PIO_MODES] & 0xFF)) - 1 ;
+
+		/* But wait.. there's more. Design your standards by
+		 * committee and you too can get a free iordy field to
+		 * process. However its the speeds not the modes that
+		 * are supported... Note drivers using the timing API
+		 * will get this right anyway
+		 */
+	}
+
+	mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
+
+	udma_mask = 0;
+	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
+		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
+
+	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
+}
+
+/**
+ *	ata_port_queue_task - Queue port_task
+ *	@ap: The ata_port to queue port_task for
+ *	@fn: workqueue function to be scheduled
+ *	@data: data value to pass to workqueue function
+ *	@delay: delay time for workqueue function
+ *
+ *	Schedule @fn(@data) for execution after @delay jiffies using
+ *	port_task.  There is one port_task per port and it's the
+ *	user(low level driver)'s responsibility to make sure that only
+ *	one task is active at any given time.
+ *
+ *	libata core layer takes care of synchronization between
+ *	port_task and EH.  ata_port_queue_task() may be ignored for EH
+ *	synchronization.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+void ata_port_queue_task(struct ata_port *ap, void (*fn)(void *), void *data,
+			 unsigned long delay)
+{
+	int rc;
+
+	if (ap->pflags & ATA_PFLAG_FLUSH_PORT_TASK)
+		return;
+
+	PREPARE_WORK(&ap->port_task, fn, data);
+
+	if (!delay)
+		rc = queue_work(ata_wq, &ap->port_task);
+	else
+		rc = queue_delayed_work(ata_wq, &ap->port_task, delay);
+
+	/* rc == 0 means that another user is using port task */
+	WARN_ON(rc == 0);
+}
+
+/**
+ *	ata_port_flush_task - Flush port_task
+ *	@ap: The ata_port to flush port_task for
+ *
+ *	After this function completes, port_task is guranteed not to
+ *	be running or scheduled.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ */
+void ata_port_flush_task(struct ata_port *ap)
+{
+	unsigned long flags;
+
+	DPRINTK("ENTER\n");
+
+	spin_lock_irqsave(ap->lock, flags);
+	ap->pflags |= ATA_PFLAG_FLUSH_PORT_TASK;
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	DPRINTK("flush #1\n");
+	flush_workqueue(ata_wq);
+
+	/*
+	 * At this point, if a task is running, it's guaranteed to see
+	 * the FLUSH flag; thus, it will never queue pio tasks again.
+	 * Cancel and flush.
+	 */
+	if (!cancel_delayed_work(&ap->port_task)) {
+		if (ata_msg_ctl(ap))
+			ata_port_printk(ap, KERN_DEBUG, "%s: flush #2\n",
+					__FUNCTION__);
+		flush_workqueue(ata_wq);
+	}
+
+	spin_lock_irqsave(ap->lock, flags);
+	ap->pflags &= ~ATA_PFLAG_FLUSH_PORT_TASK;
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	if (ata_msg_ctl(ap))
+		ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __FUNCTION__);
+}
+
+void ata_qc_complete_internal(struct ata_queued_cmd *qc)
+{
+	struct completion *waiting = qc->private_data;
+
+	complete(waiting);
+}
+
+/**
+ *	ata_exec_internal - execute libata internal command
+ *	@dev: Device to which the command is sent
+ *	@tf: Taskfile registers for the command and the result
+ *	@cdb: CDB for packet command
+ *	@dma_dir: Data tranfer direction of the command
+ *	@buf: Data buffer of the command
+ *	@buflen: Length of data buffer
+ *
+ *	Executes libata internal command with timeout.  @tf contains
+ *	command on entry and result on return.  Timeout and error
+ *	conditions are reported via return value.  No recovery action
+ *	is taken after a command times out.  It's caller's duty to
+ *	clean up after timeout.
+ *
+ *	LOCKING:
+ *	None.  Should be called with kernel context, might sleep.
+ *
+ *	RETURNS:
+ *	Zero on success, AC_ERR_* mask on failure
+ */
+unsigned ata_exec_internal(struct ata_device *dev,
+			   struct ata_taskfile *tf, const u8 *cdb,
+			   int dma_dir, void *buf, unsigned int buflen)
+{
+	struct ata_port *ap = dev->ap;
+	u8 command = tf->command;
+	struct ata_queued_cmd *qc;
+	unsigned int tag, preempted_tag;
+	u32 preempted_sactive, preempted_qc_active;
+	DECLARE_COMPLETION_ONSTACK(wait);
+	unsigned long flags;
+	unsigned int err_mask;
+	int rc;
+
+	spin_lock_irqsave(ap->lock, flags);
+
+	/* no internal command while frozen */
+	if (ap->pflags & ATA_PFLAG_FROZEN) {
+		spin_unlock_irqrestore(ap->lock, flags);
+		return AC_ERR_SYSTEM;
+	}
+
+	/* initialize internal qc */
+
+	/* XXX: Tag 0 is used for drivers with legacy EH as some
+	 * drivers choke if any other tag is given.  This breaks
+	 * ata_tag_internal() test for those drivers.  Don't use new
+	 * EH stuff without converting to it.
+	 */
+	if (ap->ops->error_handler)
+		tag = ATA_TAG_INTERNAL;
+	else
+		tag = 0;
+
+	if (test_and_set_bit(tag, &ap->qc_allocated))
+		BUG();
+	qc = __ata_qc_from_tag(ap, tag);
+
+	qc->tag = tag;
+	qc->scsicmd = NULL;
+	qc->ap = ap;
+	qc->dev = dev;
+	ata_qc_reinit(qc);
+
+	preempted_tag = ap->active_tag;
+	preempted_sactive = ap->sactive;
+	preempted_qc_active = ap->qc_active;
+	ap->active_tag = ATA_TAG_POISON;
+	ap->sactive = 0;
+	ap->qc_active = 0;
+
+	/* prepare & issue qc */
+	qc->tf = *tf;
+	if (cdb)
+		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
+	qc->flags |= ATA_QCFLAG_RESULT_TF;
+	qc->dma_dir = dma_dir;
+	if (dma_dir != DMA_NONE) {
+		ata_sg_init_one(qc, buf, buflen);
+		qc->nsect = buflen / ATA_SECT_SIZE;
+	}
+
+	qc->private_data = &wait;
+	qc->complete_fn = ata_qc_complete_internal;
+
+	ata_qc_issue(qc);
+
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	rc = wait_for_completion_timeout(&wait, ata_probe_timeout);
+
+	ata_port_flush_task(ap);
+
+	if (!rc) {
+		spin_lock_irqsave(ap->lock, flags);
+
+		/* We're racing with irq here.  If we lose, the
+		 * following test prevents us from completing the qc
+		 * twice.  If we win, the port is frozen and will be
+		 * cleaned up by ->post_internal_cmd().
+		 */
+		if (qc->flags & ATA_QCFLAG_ACTIVE) {
+			qc->err_mask |= AC_ERR_TIMEOUT;
+
+			if (ap->ops->error_handler)
+				ata_port_freeze(ap);
+			else
+				ata_qc_complete(qc);
+
+			if (ata_msg_warn(ap))
+				ata_dev_printk(dev, KERN_WARNING,
+					"qc timeout (cmd 0x%x)\n", command);
+		}
+
+		spin_unlock_irqrestore(ap->lock, flags);
+	}
+
+	/* do post_internal_cmd */
+	if (ap->ops->post_internal_cmd)
+		ap->ops->post_internal_cmd(qc);
+
+	if (qc->flags & ATA_QCFLAG_FAILED && !qc->err_mask) {
+		if (ata_msg_warn(ap))
+			ata_dev_printk(dev, KERN_WARNING,
+				"zero err_mask for failed "
+				"internal command, assuming AC_ERR_OTHER\n");
+		qc->err_mask |= AC_ERR_OTHER;
+	}
+
+	/* finish up */
+	spin_lock_irqsave(ap->lock, flags);
+
+	*tf = qc->result_tf;
+	err_mask = qc->err_mask;
+
+	ata_qc_free(qc);
+	ap->active_tag = preempted_tag;
+	ap->sactive = preempted_sactive;
+	ap->qc_active = preempted_qc_active;
+
+	/* XXX - Some LLDDs (sata_mv) disable port on command failure.
+	 * Until those drivers are fixed, we detect the condition
+	 * here, fail the command with AC_ERR_SYSTEM and reenable the
+	 * port.
+	 *
+	 * Note that this doesn't change any behavior as internal
+	 * command failure results in disabling the device in the
+	 * higher layer for LLDDs without new reset/EH callbacks.
+	 *
+	 * Kill the following code as soon as those drivers are fixed.
+	 */
+	if (ap->flags & ATA_FLAG_DISABLED) {
+		err_mask |= AC_ERR_SYSTEM;
+		ata_port_probe(ap);
+	}
+
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	return err_mask;
+}
+
+/**
+ *	ata_do_simple_cmd - execute simple internal command
+ *	@dev: Device to which the command is sent
+ *	@cmd: Opcode to execute
+ *
+ *	Execute a 'simple' command, that only consists of the opcode
+ *	'cmd' itself, without filling any other registers
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	Zero on success, AC_ERR_* mask on failure
+ */
+unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
+{
+	struct ata_taskfile tf;
+
+	ata_tf_init(dev, &tf);
+
+	tf.command = cmd;
+	tf.flags |= ATA_TFLAG_DEVICE;
+	tf.protocol = ATA_PROT_NODATA;
+
+	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
+}
+
+/**
+ *	ata_pio_need_iordy	-	check if iordy needed
+ *	@adev: ATA device
+ *
+ *	Check if the current speed of the device requires IORDY. Used
+ *	by various controllers for chip configuration.
+ */
+
+unsigned int ata_pio_need_iordy(const struct ata_device *adev)
+{
+	int pio;
+	int speed = adev->pio_mode - XFER_PIO_0;
+
+	if (speed < 2)
+		return 0;
+	if (speed > 2)
+		return 1;
+
+	/* If we have no drive specific rule, then PIO 2 is non IORDY */
+
+	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE */
+		pio = adev->id[ATA_ID_EIDE_PIO];
+		/* Is the speed faster than the drive allows non IORDY ? */
+		if (pio) {
+			/* This is cycle times not frequency - watch the logic! */
+			if (pio > 240)	/* PIO2 is 240nS per cycle */
+				return 1;
+			return 0;
+		}
+	}
+	return 0;
+}
+
+/**
+ *	ata_dev_read_id - Read ID data from the specified device
+ *	@dev: target device
+ *	@p_class: pointer to class of the target device (may be changed)
+ *	@post_reset: is this read ID post-reset?
+ *	@id: buffer to read IDENTIFY data into
+ *
+ *	Read ID data from the specified device.  ATA_CMD_ID_ATA is
+ *	performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
+ *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
+ *	for pre-ATA4 drives.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise.
+ */
+int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
+		    int post_reset, u16 *id)
+{
+	struct ata_port *ap = dev->ap;
+	unsigned int class = *p_class;
+	struct ata_taskfile tf;
+	unsigned int err_mask = 0;
+	const char *reason;
+	int rc;
+
+	if (ata_msg_ctl(ap))
+		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER, host %u, dev %u\n",
+			       __FUNCTION__, ap->id, dev->devno);
+
+	ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */
+
+ retry:
+	ata_tf_init(dev, &tf);
+
+	switch (class) {
+	case ATA_DEV_ATA:
+		tf.command = ATA_CMD_ID_ATA;
+		break;
+	case ATA_DEV_ATAPI:
+		tf.command = ATA_CMD_ID_ATAPI;
+		break;
+	default:
+		rc = -ENODEV;
+		reason = "unsupported class";
+		goto err_out;
+	}
+
+	tf.protocol = ATA_PROT_PIO;
+
+	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
+				     id, sizeof(id[0]) * ATA_ID_WORDS);
+	if (err_mask) {
+		rc = -EIO;
+		reason = "I/O error";
+		goto err_out;
+	}
+
+	swap_buf_le16(id, ATA_ID_WORDS);
+
+	/* sanity check */
+	if ((class == ATA_DEV_ATA) != (ata_id_is_ata(id) | ata_id_is_cfa(id))) {
+		rc = -EINVAL;
+		reason = "device reports illegal type";
+		goto err_out;
+	}
+
+	if (post_reset && class == ATA_DEV_ATA) {
+		/*
+		 * The exact sequence expected by certain pre-ATA4 drives is:
+		 * SRST RESET
+		 * IDENTIFY
+		 * INITIALIZE DEVICE PARAMETERS
+		 * anything else..
+		 * Some drives were very specific about that exact sequence.
+		 */
+		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
+			err_mask = ata_dev_init_params(dev, id[3], id[6]);
+			if (err_mask) {
+				rc = -EIO;
+				reason = "INIT_DEV_PARAMS failed";
+				goto err_out;
+			}
+
+			/* current CHS translation info (id[53-58]) might be
+			 * changed. reread the identify device info.
+			 */
+			post_reset = 0;
+			goto retry;
+		}
+	}
+
+	*p_class = class;
+
+	return 0;
+
+ err_out:
+	if (ata_msg_warn(ap))
+		ata_dev_printk(dev, KERN_WARNING, "failed to IDENTIFY "
+			       "(%s, err_mask=0x%x)\n", reason, err_mask);
+	return rc;
+}
+
+static inline u8 ata_dev_knobble(struct ata_device *dev)
+{
+	return ((dev->ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
+}
+
+static void ata_dev_config_ncq(struct ata_device *dev,
+			       char *desc, size_t desc_sz)
+{
+	struct ata_port *ap = dev->ap;
+	int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
+
+	if (!ata_id_has_ncq(dev->id)) {
+		desc[0] = '\0';
+		return;
+	}
+
+	if (ap->flags & ATA_FLAG_NCQ) {
+		hdepth = min(ap->host->can_queue, ATA_MAX_QUEUE - 1);
+		dev->flags |= ATA_DFLAG_NCQ;
+	}
+
+	if (hdepth >= ddepth)
+		snprintf(desc, desc_sz, "NCQ (depth %d)", ddepth);
+	else
+		snprintf(desc, desc_sz, "NCQ (depth %d/%d)", hdepth, ddepth);
+}
+
+static void ata_set_port_max_cmd_len(struct ata_port *ap)
+{
+	int i;
+
+	if (ap->host) {
+		ap->host->max_cmd_len = 0;
+		for (i = 0; i < ATA_MAX_DEVICES; i++)
+			ap->host->max_cmd_len = max_t(unsigned int,
+						      ap->host->max_cmd_len,
+						      ap->device[i].cdb_len);
+	}
+}
+
+/**
+ *	ata_dev_configure - Configure the specified ATA/ATAPI device
+ *	@dev: Target device to configure
+ *	@print_info: Enable device info printout
+ *
+ *	Configure @dev according to @dev->id.  Generic and low-level
+ *	driver specific fixups are also applied.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise
+ */
+int ata_dev_configure(struct ata_device *dev, int print_info)
+{
+	struct ata_port *ap = dev->ap;
+	const u16 *id = dev->id;
+	unsigned int xfer_mask;
+	int rc;
+
+	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
+		ata_dev_printk(dev, KERN_INFO,
+			       "%s: ENTER/EXIT (host %u, dev %u) -- nodev\n",
+			       __FUNCTION__, ap->id, dev->devno);
+		return 0;
+	}
+
+	if (ata_msg_probe(ap))
+		ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER, host %u, dev %u\n",
+			       __FUNCTION__, ap->id, dev->devno);
+
+	/* print device capabilities */
+	if (ata_msg_probe(ap))
+		ata_dev_printk(dev, KERN_DEBUG,
+			       "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
+			       "85:%04x 86:%04x 87:%04x 88:%04x\n",
+			       __FUNCTION__,
+			       id[49], id[82], id[83], id[84],
+			       id[85], id[86], id[87], id[88]);
+
+	/* initialize to-be-configured parameters */
+	dev->flags &= ~ATA_DFLAG_CFG_MASK;
+	dev->max_sectors = 0;
+	dev->cdb_len = 0;
+	dev->n_sectors = 0;
+	dev->cylinders = 0;
+	dev->heads = 0;
+	dev->sectors = 0;
+
+	/*
+	 * common ATA, ATAPI feature tests
+	 */
+
+	/* find max transfer mode; for printk only */
+	xfer_mask = ata_id_xfermask(id);
+
+	if (ata_msg_probe(ap))
+		ata_dump_id(id);
+
+	/* ATA-specific feature tests */
+	if (dev->class == ATA_DEV_ATA) {
+		dev->n_sectors = ata_id_n_sectors(id);
+
+		if (ata_id_has_lba(id)) {
+			const char *lba_desc;
+			char ncq_desc[20];
+
+			lba_desc = "LBA";
+			dev->flags |= ATA_DFLAG_LBA;
+			if (ata_id_has_lba48(id)) {
+				dev->flags |= ATA_DFLAG_LBA48;
+				lba_desc = "LBA48";
+			}
+
+			/* config NCQ */
+			ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
+
+			/* print device info to dmesg */
+			if (ata_msg_drv(ap) && print_info)
+				ata_dev_printk(dev, KERN_INFO, "ATA-%d, "
+					"max %s, %Lu sectors: %s %s\n",
+					ata_id_major_version(id),
+					ata_mode_string(xfer_mask),
+					(unsigned long long)dev->n_sectors,
+					lba_desc, ncq_desc);
+		} else {
+			/* CHS */
+
+			/* Default translation */
+			dev->cylinders	= id[1];
+			dev->heads	= id[3];
+			dev->sectors	= id[6];
+
+			if (ata_id_current_chs_valid(id)) {
+				/* Current CHS translation is valid. */
+				dev->cylinders = id[54];
+				dev->heads     = id[55];
+				dev->sectors   = id[56];
+			}
+
+			/* print device info to dmesg */
+			if (ata_msg_drv(ap) && print_info)
+				ata_dev_printk(dev, KERN_INFO, "ATA-%d, "
+					"max %s, %Lu sectors: CHS %u/%u/%u\n",
+					ata_id_major_version(id),
+					ata_mode_string(xfer_mask),
+					(unsigned long long)dev->n_sectors,
+					dev->cylinders, dev->heads,
+					dev->sectors);
+		}
+
+		if (dev->id[59] & 0x100) {
+			dev->multi_count = dev->id[59] & 0xff;
+			if (ata_msg_drv(ap) && print_info)
+				ata_dev_printk(dev, KERN_INFO,
+					"ata%u: dev %u multi count %u\n",
+					ap->id, dev->devno, dev->multi_count);
+		}
+
+		dev->cdb_len = 16;
+	}
+
+	/* ATAPI-specific feature tests */
+	else if (dev->class == ATA_DEV_ATAPI) {
+		char *cdb_intr_string = "";
+
+		rc = atapi_cdb_len(id);
+		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
+			if (ata_msg_warn(ap))
+				ata_dev_printk(dev, KERN_WARNING,
+					       "unsupported CDB len\n");
+			rc = -EINVAL;
+			goto err_out_nosup;
+		}
+		dev->cdb_len = (unsigned int) rc;
+
+		if (ata_id_cdb_intr(dev->id)) {
+			dev->flags |= ATA_DFLAG_CDB_INTR;
+			cdb_intr_string = ", CDB intr";
+		}
+
+		/* print device info to dmesg */
+		if (ata_msg_drv(ap) && print_info)
+			ata_dev_printk(dev, KERN_INFO, "ATAPI, max %s%s\n",
+				       ata_mode_string(xfer_mask),
+				       cdb_intr_string);
+	}
+
+	ata_set_port_max_cmd_len(ap);
+
+	/* limit bridge transfers to udma5, 200 sectors */
+	if (ata_dev_knobble(dev)) {
+		if (ata_msg_drv(ap) && print_info)
+			ata_dev_printk(dev, KERN_INFO,
+				       "applying bridge limits\n");
+		dev->udma_mask &= ATA_UDMA5;
+		dev->max_sectors = ATA_MAX_SECTORS;
+	}
+
+	if (ap->ops->dev_config)
+		ap->ops->dev_config(ap, dev);
+
+	if (ata_msg_probe(ap))
+		ata_dev_printk(dev, KERN_DEBUG, "%s: EXIT, drv_stat = 0x%x\n",
+			__FUNCTION__, ata_chk_status(ap));
+	return 0;
+
+err_out_nosup:
+	if (ata_msg_probe(ap))
+		ata_dev_printk(dev, KERN_DEBUG,
+			       "%s: EXIT, err\n", __FUNCTION__);
+	return rc;
+}
+
+/**
+ *	ata_bus_probe - Reset and probe ATA bus
+ *	@ap: Bus to probe
+ *
+ *	Master ATA bus probing function.  Initiates a hardware-dependent
+ *	bus reset, then attempts to identify any devices found on
+ *	the bus.
+ *
+ *	LOCKING:
+ *	PCI/etc. bus probe sem.
+ *
+ *	RETURNS:
+ *	Zero on success, negative errno otherwise.
+ */
+
+int ata_bus_probe(struct ata_port *ap)
+{
+	unsigned int classes[ATA_MAX_DEVICES];
+	int tries[ATA_MAX_DEVICES];
+	int i, rc, down_xfermask;
+	struct ata_device *dev;
+
+	ata_port_probe(ap);
+
+	for (i = 0; i < ATA_MAX_DEVICES; i++)
+		tries[i] = ATA_PROBE_MAX_TRIES;
+
+ retry:
+	down_xfermask = 0;
+
+	/* reset and determine device classes */
+	ap->ops->phy_reset(ap);
+
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		dev = &ap->device[i];
+
+		if (!(ap->flags & ATA_FLAG_DISABLED) &&
+		    dev->class != ATA_DEV_UNKNOWN)
+			classes[dev->devno] = dev->class;
+		else
+			classes[dev->devno] = ATA_DEV_NONE;
+
+		dev->class = ATA_DEV_UNKNOWN;
+	}
+
+	ata_port_probe(ap);
+
+	/* after the reset the device state is PIO 0 and the controller
+	   state is undefined. Record the mode */
+
+	for (i = 0; i < ATA_MAX_DEVICES; i++)
+		ap->device[i].pio_mode = XFER_PIO_0;
+
+	/* read IDENTIFY page and configure devices */
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		dev = &ap->device[i];
+
+		if (tries[i])
+			dev->class = classes[i];
+
+		if (!ata_dev_enabled(dev))
+			continue;
+
+		rc = ata_dev_read_id(dev, &dev->class, 1, dev->id);
+		if (rc)
+			goto fail;
+
+		rc = ata_dev_configure(dev, 1);
+		if (rc)
+			goto fail;
+	}
+
+	/* configure transfer mode */
+	rc = ata_set_mode(ap, &dev);
+	if (rc) {
+		down_xfermask = 1;
+		goto fail;
+	}
+
+	for (i = 0; i < ATA_MAX_DEVICES; i++)
+		if (ata_dev_enabled(&ap->device[i]))
+			return 0;
+
+	/* no device present, disable port */
+	ata_port_disable(ap);
+	ap->ops->port_disable(ap);
+	return -ENODEV;
+
+ fail:
+	switch (rc) {
+	case -EINVAL:
+	case -ENODEV:
+		tries[dev->devno] = 0;
+		break;
+	case -EIO:
+		sata_down_spd_limit(ap);
+		/* fall through */
+	default:
+		tries[dev->devno]--;
+		if (down_xfermask &&
+		    ata_down_xfermask_limit(dev, tries[dev->devno] == 1))
+			tries[dev->devno] = 0;
+	}
+
+	if (!tries[dev->devno]) {
+		ata_down_xfermask_limit(dev, 1);
+		ata_dev_disable(dev);
+	}
+
+	goto retry;
+}
+
+/**
+ *	ata_port_probe - Mark port as enabled
+ *	@ap: Port for which we indicate enablement
+ *
+ *	Modify @ap data structure such that the system
+ *	thinks that the entire port is enabled.
+ *
+ *	LOCKING: host_set lock, or some other form of
+ *	serialization.
+ */
+
+void ata_port_probe(struct ata_port *ap)
+{
+	ap->flags &= ~ATA_FLAG_DISABLED;
+}
+
+/**
+ *	sata_print_link_status - Print SATA link status
+ *	@ap: SATA port to printk link status about
+ *
+ *	This function prints link speed and status of a SATA link.
+ *
+ *	LOCKING:
+ *	None.
+ */
+static void sata_print_link_status(struct ata_port *ap)
+{
+	u32 sstatus, scontrol, tmp;
+
+	if (sata_scr_read(ap, SCR_STATUS, &sstatus))
+		return;
+	sata_scr_read(ap, SCR_CONTROL, &scontrol);
+
+	if (ata_port_online(ap)) {
+		tmp = (sstatus >> 4) & 0xf;
+		ata_port_printk(ap, KERN_INFO,
+				"SATA link up %s (SStatus %X SControl %X)\n",
+				sata_spd_string(tmp), sstatus, scontrol);
+	} else {
+		ata_port_printk(ap, KERN_INFO,
+				"SATA link down (SStatus %X SControl %X)\n",
+				sstatus, scontrol);
+	}
+}
+
+/**
+ *	__sata_phy_reset - Wake/reset a low-level SATA PHY
+ *	@ap: SATA port associated with target SATA PHY.
+ *
+ *	This function issues commands to standard SATA Sxxx
+ *	PHY registers, to wake up the phy (and device), and
+ *	clear any reset condition.
+ *
+ *	LOCKING:
+ *	PCI/etc. bus probe sem.
+ *
+ */
+void __sata_phy_reset(struct ata_port *ap)
+{
+	u32 sstatus;
+	unsigned long timeout = jiffies + (HZ * 5);
+
+	if (ap->flags & ATA_FLAG_SATA_RESET) {
+		/* issue phy wake/reset */
+		sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
+		/* Couldn't find anything in SATA I/II specs, but
+		 * AHCI-1.1 10.4.2 says at least 1 ms. */
+		mdelay(1);
+	}
+	/* phy wake/clear reset */
+	sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
+
+	/* wait for phy to become ready, if necessary */
+	do {
+		msleep(200);
+		sata_scr_read(ap, SCR_STATUS, &sstatus);
+		if ((sstatus & 0xf) != 1)
+			break;
+	} while (time_before(jiffies, timeout));
+
+	/* print link status */
+	sata_print_link_status(ap);
+
+	/* TODO: phy layer with polling, timeouts, etc. */
+	if (!ata_port_offline(ap))
+		ata_port_probe(ap);
+	else
+		ata_port_disable(ap);
+
+	if (ap->flags & ATA_FLAG_DISABLED)
+		return;
+
+	if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
+		ata_port_disable(ap);
+		return;
+	}
+
+	ap->cbl = ATA_CBL_SATA;
+}
+
+/**
+ *	sata_phy_reset - Reset SATA bus.
+ *	@ap: SATA port associated with target SATA PHY.
+ *
+ *	This function resets the SATA bus, and then probes
+ *	the bus for devices.
+ *
+ *	LOCKING:
+ *	PCI/etc. bus probe sem.
+ *
+ */
+void sata_phy_reset(struct ata_port *ap)
+{
+	__sata_phy_reset(ap);
+	if (ap->flags & ATA_FLAG_DISABLED)
+		return;
+	ata_bus_reset(ap);
+}
+
+/**
+ *	ata_dev_pair		-	return other device on cable
+ *	@adev: device
+ *
+ *	Obtain the other device on the same cable, or if none is
+ *	present NULL is returned
+ */
+
+struct ata_device *ata_dev_pair(struct ata_device *adev)
+{
+	struct ata_port *ap = adev->ap;
+	struct ata_device *pair = &ap->device[1 - adev->devno];
+	if (!ata_dev_enabled(pair))
+		return NULL;
+	return pair;
+}
+
+/**
+ *	ata_port_disable - Disable port.
+ *	@ap: Port to be disabled.
+ *
+ *	Modify @ap data structure such that the system
+ *	thinks that the entire port is disabled, and should
+ *	never attempt to probe or communicate with devices
+ *	on this port.
+ *
+ *	LOCKING: host_set lock, or some other form of
+ *	serialization.
+ */
+
+void ata_port_disable(struct ata_port *ap)
+{
+	ap->device[0].class = ATA_DEV_NONE;
+	ap->device[1].class = ATA_DEV_NONE;
+	ap->flags |= ATA_FLAG_DISABLED;
+}
+
+/**
+ *	sata_down_spd_limit - adjust SATA spd limit downward
+ *	@ap: Port to adjust SATA spd limit for
+ *
+ *	Adjust SATA spd limit of @ap downward.  Note that this
+ *	function only adjusts the limit.  The change must be applied
+ *	using sata_set_spd().
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ *
+ *	RETURNS:
+ *	0 on success, negative errno on failure
+ */
+int sata_down_spd_limit(struct ata_port *ap)
+{
+	u32 sstatus, spd, mask;
+	int rc, highbit;
+
+	rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
+	if (rc)
+		return rc;
+
+	mask = ap->sata_spd_limit;
+	if (mask <= 1)
+		return -EINVAL;
+	highbit = fls(mask) - 1;
+	mask &= ~(1 << highbit);
+
+	spd = (sstatus >> 4) & 0xf;
+	if (spd <= 1)
+		return -EINVAL;
+	spd--;
+	mask &= (1 << spd) - 1;
+	if (!mask)
+		return -EINVAL;
+
+	ap->sata_spd_limit = mask;
+
+	ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
+			sata_spd_string(fls(mask)));
+
+	return 0;
+}
+
+static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
+{
+	u32 spd, limit;
+
+	if (ap->sata_spd_limit == UINT_MAX)
+		limit = 0;
+	else
+		limit = fls(ap->sata_spd_limit);
+
+	spd = (*scontrol >> 4) & 0xf;
+	*scontrol = (*scontrol & ~0xf0) | ((limit & 0xf) << 4);
+
+	return spd != limit;
+}
+
+/**
+ *	sata_set_spd_needed - is SATA spd configuration needed
+ *	@ap: Port in question
+ *
+ *	Test whether the spd limit in SControl matches
+ *	@ap->sata_spd_limit.  This function is used to determine
+ *	whether hardreset is necessary to apply SATA spd
+ *	configuration.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ *
+ *	RETURNS:
+ *	1 if SATA spd configuration is needed, 0 otherwise.
+ */
+int sata_set_spd_needed(struct ata_port *ap)
+{
+	u32 scontrol;
+
+	if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
+		return 0;
+
+	return __sata_set_spd_needed(ap, &scontrol);
+}
+
+/**
+ *	sata_set_spd - set SATA spd according to spd limit
+ *	@ap: Port to set SATA spd for
+ *
+ *	Set SATA spd of @ap according to sata_spd_limit.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ *
+ *	RETURNS:
+ *	0 if spd doesn't need to be changed, 1 if spd has been
+ *	changed.  Negative errno if SCR registers are inaccessible.
+ */
+int sata_set_spd(struct ata_port *ap)
+{
+	u32 scontrol;
+	int rc;
+
+	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
+		return rc;
+
+	if (!__sata_set_spd_needed(ap, &scontrol))
+		return 0;
+
+	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
+		return rc;
+
+	return 1;
+}
+
+/*
+ * This mode timing computation functionality is ported over from
+ * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
+ */
+/*
+ * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
+ * These were taken from ATA/ATAPI-6 standard, rev 0a, except
+ * for PIO 5, which is a nonstandard extension and UDMA6, which
+ * is currently supported only by Maxtor drives.
+ */
+
+static const struct ata_timing ata_timing[] = {
+
+	{ XFER_UDMA_6,     0,   0,   0,   0,   0,   0,   0,  15 },
+	{ XFER_UDMA_5,     0,   0,   0,   0,   0,   0,   0,  20 },
+	{ XFER_UDMA_4,     0,   0,   0,   0,   0,   0,   0,  30 },
+	{ XFER_UDMA_3,     0,   0,   0,   0,   0,   0,   0,  45 },
+
+	{ XFER_UDMA_2,     0,   0,   0,   0,   0,   0,   0,  60 },
+	{ XFER_UDMA_1,     0,   0,   0,   0,   0,   0,   0,  80 },
+	{ XFER_UDMA_0,     0,   0,   0,   0,   0,   0,   0, 120 },
+
+/*	{ XFER_UDMA_SLOW,  0,   0,   0,   0,   0,   0,   0, 150 }, */
+
+	{ XFER_MW_DMA_2,  25,   0,   0,   0,  70,  25, 120,   0 },
+	{ XFER_MW_DMA_1,  45,   0,   0,   0,  80,  50, 150,   0 },
+	{ XFER_MW_DMA_0,  60,   0,   0,   0, 215, 215, 480,   0 },
+
+	{ XFER_SW_DMA_2,  60,   0,   0,   0, 120, 120, 240,   0 },
+	{ XFER_SW_DMA_1,  90,   0,   0,   0, 240, 240, 480,   0 },
+	{ XFER_SW_DMA_0, 120,   0,   0,   0, 480, 480, 960,   0 },
+
+/*	{ XFER_PIO_5,     20,  50,  30, 100,  50,  30, 100,   0 }, */
+	{ XFER_PIO_4,     25,  70,  25, 120,  70,  25, 120,   0 },
+	{ XFER_PIO_3,     30,  80,  70, 180,  80,  70, 180,   0 },
+
+	{ XFER_PIO_2,     30, 290,  40, 330, 100,  90, 240,   0 },
+	{ XFER_PIO_1,     50, 290,  93, 383, 125, 100, 383,   0 },
+	{ XFER_PIO_0,     70, 290, 240, 600, 165, 150, 600,   0 },
+
+/*	{ XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 960,   0 }, */
+
+	{ 0xFF }
+};
+
+#define ENOUGH(v,unit)		(((v)-1)/(unit)+1)
+#define EZ(v,unit)		((v)?ENOUGH(v,unit):0)
+
+static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
+{
+	q->setup   = EZ(t->setup   * 1000,  T);
+	q->act8b   = EZ(t->act8b   * 1000,  T);
+	q->rec8b   = EZ(t->rec8b   * 1000,  T);
+	q->cyc8b   = EZ(t->cyc8b   * 1000,  T);
+	q->active  = EZ(t->active  * 1000,  T);
+	q->recover = EZ(t->recover * 1000,  T);
+	q->cycle   = EZ(t->cycle   * 1000,  T);
+	q->udma    = EZ(t->udma    * 1000, UT);
+}
+
+void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
+		      struct ata_timing *m, unsigned int what)
+{
+	if (what & ATA_TIMING_SETUP  ) m->setup   = max(a->setup,   b->setup);
+	if (what & ATA_TIMING_ACT8B  ) m->act8b   = max(a->act8b,   b->act8b);
+	if (what & ATA_TIMING_REC8B  ) m->rec8b   = max(a->rec8b,   b->rec8b);
+	if (what & ATA_TIMING_CYC8B  ) m->cyc8b   = max(a->cyc8b,   b->cyc8b);
+	if (what & ATA_TIMING_ACTIVE ) m->active  = max(a->active,  b->active);
+	if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
+	if (what & ATA_TIMING_CYCLE  ) m->cycle   = max(a->cycle,   b->cycle);
+	if (what & ATA_TIMING_UDMA   ) m->udma    = max(a->udma,    b->udma);
+}
+
+static const struct ata_timing* ata_timing_find_mode(unsigned short speed)
+{
+	const struct ata_timing *t;
+
+	for (t = ata_timing; t->mode != speed; t++)
+		if (t->mode == 0xFF)
+			return NULL;
+	return t;
+}
+
+int ata_timing_compute(struct ata_device *adev, unsigned short speed,
+		       struct ata_timing *t, int T, int UT)
+{
+	const struct ata_timing *s;
+	struct ata_timing p;
+
+	/*
+	 * Find the mode.
+	 */
+
+	if (!(s = ata_timing_find_mode(speed)))
+		return -EINVAL;
+
+	memcpy(t, s, sizeof(*s));
+
+	/*
+	 * If the drive is an EIDE drive, it can tell us it needs extended
+	 * PIO/MW_DMA cycle timing.
+	 */
+
+	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE drive */
+		memset(&p, 0, sizeof(p));
+		if(speed >= XFER_PIO_0 && speed <= XFER_SW_DMA_0) {
+			if (speed <= XFER_PIO_2) p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO];
+					    else p.cycle = p.cyc8b = adev->id[ATA_ID_EIDE_PIO_IORDY];
+		} else if(speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2) {
+			p.cycle = adev->id[ATA_ID_EIDE_DMA_MIN];
+		}
+		ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
+	}
+
+	/*
+	 * Convert the timing to bus clock counts.
+	 */
+
+	ata_timing_quantize(t, t, T, UT);
+
+	/*
+	 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
+	 * S.M.A.R.T * and some other commands. We have to ensure that the
+	 * DMA cycle timing is slower/equal than the fastest PIO timing.
+	 */
+
+	if (speed > XFER_PIO_4) {
+		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
+		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
+	}
+
+	/*
+	 * Lengthen active & recovery time so that cycle time is correct.
+	 */
+
+	if (t->act8b + t->rec8b < t->cyc8b) {
+		t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
+		t->rec8b = t->cyc8b - t->act8b;
+	}
+
+	if (t->active + t->recover < t->cycle) {
+		t->active += (t->cycle - (t->active + t->recover)) / 2;
+		t->recover = t->cycle - t->active;
+	}
+
+	return 0;
+}
+
+/**
+ *	ata_down_xfermask_limit - adjust dev xfer masks downward
+ *	@dev: Device to adjust xfer masks
+ *	@force_pio0: Force PIO0
+ *
+ *	Adjust xfer masks of @dev downward.  Note that this function
+ *	does not apply the change.  Invoking ata_set_mode() afterwards
+ *	will apply the limit.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ *
+ *	RETURNS:
+ *	0 on success, negative errno on failure
+ */
+int ata_down_xfermask_limit(struct ata_device *dev, int force_pio0)
+{
+	unsigned long xfer_mask;
+	int highbit;
+
+	xfer_mask = ata_pack_xfermask(dev->pio_mask, dev->mwdma_mask,
+				      dev->udma_mask);
+
+	if (!xfer_mask)
+		goto fail;
+	/* don't gear down to MWDMA from UDMA, go directly to PIO */
+	if (xfer_mask & ATA_MASK_UDMA)
+		xfer_mask &= ~ATA_MASK_MWDMA;
+
+	highbit = fls(xfer_mask) - 1;
+	xfer_mask &= ~(1 << highbit);
+	if (force_pio0)
+		xfer_mask &= 1 << ATA_SHIFT_PIO;
+	if (!xfer_mask)
+		goto fail;
+
+	ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
+			    &dev->udma_mask);
+
+	ata_dev_printk(dev, KERN_WARNING, "limiting speed to %s\n",
+		       ata_mode_string(xfer_mask));
+
+	return 0;
+
+ fail:
+	return -EINVAL;
+}
+
+static int ata_dev_set_mode(struct ata_device *dev)
+{
+	unsigned int err_mask;
+	int rc;
+
+	dev->flags &= ~ATA_DFLAG_PIO;
+	if (dev->xfer_shift == ATA_SHIFT_PIO)
+		dev->flags |= ATA_DFLAG_PIO;
+
+	err_mask = ata_dev_set_xfermode(dev);
+	if (err_mask) {
+		ata_dev_printk(dev, KERN_ERR, "failed to set xfermode "
+			       "(err_mask=0x%x)\n", err_mask);
+		return -EIO;
+	}
+
+	rc = ata_dev_revalidate(dev, 0);
+	if (rc)
+		return rc;
+
+	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
+		dev->xfer_shift, (int)dev->xfer_mode);
+
+	ata_dev_printk(dev, KERN_INFO, "configured for %s\n",
+		       ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)));
+	return 0;
+}
+
+/**
+ *	ata_set_mode - Program timings and issue SET FEATURES - XFER
+ *	@ap: port on which timings will be programmed
+ *	@r_failed_dev: out paramter for failed device
+ *
+ *	Set ATA device disk transfer mode (PIO3, UDMA6, etc.).  If
+ *	ata_set_mode() fails, pointer to the failing device is
+ *	returned in @r_failed_dev.
+ *
+ *	LOCKING:
+ *	PCI/etc. bus probe sem.
+ *
+ *	RETURNS:
+ *	0 on success, negative errno otherwise
+ */
+int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev)
+{
+	struct ata_device *dev;
+	int i, rc = 0, used_dma = 0, found = 0;
+
+	/* has private set_mode? */
+	if (ap->ops->set_mode) {
+		/* FIXME: make ->set_mode handle no device case and
+		 * return error code and failing device on failure.
+		 */
+		for (i = 0; i < ATA_MAX_DEVICES; i++) {
+			if (ata_dev_ready(&ap->device[i])) {
+				ap->ops->set_mode(ap);
+				break;
+			}
+		}
+		return 0;
+	}
+
+	/* step 1: calculate xfer_mask */
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		unsigned int pio_mask, dma_mask;
+
+		dev = &ap->device[i];
+
+		if (!ata_dev_enabled(dev))
+			continue;
+
+		ata_dev_xfermask(dev);
+
+		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
+		dma_mask = ata_pack_xfermask(0, dev->mwdma_mask, dev->udma_mask);
+		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
+		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
+
+		found = 1;
+		if (dev->dma_mode)
+			used_dma = 1;
+	}
+	if (!found)
+		goto out;
+
+	/* step 2: always set host PIO timings */
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		dev = &ap->device[i];
+		if (!ata_dev_enabled(dev))
+			continue;
+
+		if (!dev->pio_mode) {
+			ata_dev_printk(dev, KERN_WARNING, "no PIO support\n");
+			rc = -EINVAL;
+			goto out;
+		}
+
+		dev->xfer_mode = dev->pio_mode;
+		dev->xfer_shift = ATA_SHIFT_PIO;
+		if (ap->ops->set_piomode)
+			ap->ops->set_piomode(ap, dev);
+	}
+
+	/* step 3: set host DMA timings */
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		dev = &ap->device[i];
+
+		if (!ata_dev_enabled(dev) || !dev->dma_mode)
+			continue;
+
+		dev->xfer_mode = dev->dma_mode;
+		dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
+		if (ap->ops->set_dmamode)
+			ap->ops->set_dmamode(ap, dev);
+	}
+
+	/* step 4: update devices' xfer mode */
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		dev = &ap->device[i];
+
+		/* don't udpate suspended devices' xfer mode */
+		if (!ata_dev_ready(dev))
+			continue;
+
+		rc = ata_dev_set_mode(dev);
+		if (rc)
+			goto out;
+	}
+
+	/* Record simplex status. If we selected DMA then the other
+	 * host channels are not permitted to do so.
+	 */
+	if (used_dma && (ap->host_set->flags & ATA_HOST_SIMPLEX))
+		ap->host_set->simplex_claimed = 1;
+
+	/* step5: chip specific finalisation */
+	if (ap->ops->post_set_mode)
+		ap->ops->post_set_mode(ap);
+
+ out:
+	if (rc)
+		*r_failed_dev = dev;
+	return rc;
+}
+
+/**
+ *	ata_tf_to_host - issue ATA taskfile to host controller
+ *	@ap: port to which command is being issued
+ *	@tf: ATA taskfile register set
+ *
+ *	Issues ATA taskfile register set to ATA host controller,
+ *	with proper synchronization with interrupt handler and
+ *	other threads.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+static inline void ata_tf_to_host(struct ata_port *ap,
+				  const struct ata_taskfile *tf)
+{
+	ap->ops->tf_load(ap, tf);
+	ap->ops->exec_command(ap, tf);
+}
+
+/**
+ *	ata_busy_sleep - sleep until BSY clears, or timeout
+ *	@ap: port containing status register to be polled
+ *	@tmout_pat: impatience timeout
+ *	@tmout: overall timeout
+ *
+ *	Sleep until ATA Status register bit BSY clears,
+ *	or a timeout occurs.
+ *
+ *	LOCKING: None.
+ */
+
+unsigned int ata_busy_sleep (struct ata_port *ap,
+			     unsigned long tmout_pat, unsigned long tmout)
+{
+	unsigned long timer_start, timeout;
+	u8 status;
+
+	status = ata_busy_wait(ap, ATA_BUSY, 300);
+	timer_start = jiffies;
+	timeout = timer_start + tmout_pat;
+	while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
+		msleep(50);
+		status = ata_busy_wait(ap, ATA_BUSY, 3);
+	}
+
+	if (status & ATA_BUSY)
+		ata_port_printk(ap, KERN_WARNING,
+				"port is slow to respond, please be patient\n");
+
+	timeout = timer_start + tmout;
+	while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
+		msleep(50);
+		status = ata_chk_status(ap);
+	}
+
+	if (status & ATA_BUSY) {
+		ata_port_printk(ap, KERN_ERR, "port failed to respond "
+				"(%lu secs)\n", tmout / HZ);
+		return 1;
+	}
+
+	return 0;
+}
+
+static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
+{
+	struct ata_ioports *ioaddr = &ap->ioaddr;
+	unsigned int dev0 = devmask & (1 << 0);
+	unsigned int dev1 = devmask & (1 << 1);
+	unsigned long timeout;
+
+	/* if device 0 was found in ata_devchk, wait for its
+	 * BSY bit to clear
+	 */
+	if (dev0)
+		ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
+
+	/* if device 1 was found in ata_devchk, wait for
+	 * register access, then wait for BSY to clear
+	 */
+	timeout = jiffies + ATA_TMOUT_BOOT;
+	while (dev1) {
+		u8 nsect, lbal;
+
+		ap->ops->dev_select(ap, 1);
+		if (ap->flags & ATA_FLAG_MMIO) {
+			nsect = readb((void __iomem *) ioaddr->nsect_addr);
+			lbal = readb((void __iomem *) ioaddr->lbal_addr);
+		} else {
+			nsect = inb(ioaddr->nsect_addr);
+			lbal = inb(ioaddr->lbal_addr);
+		}
+		if ((nsect == 1) && (lbal == 1))
+			break;
+		if (time_after(jiffies, timeout)) {
+			dev1 = 0;
+			break;
+		}
+		msleep(50);	/* give drive a breather */
+	}
+	if (dev1)
+		ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
+
+	/* is all this really necessary? */
+	ap->ops->dev_select(ap, 0);
+	if (dev1)
+		ap->ops->dev_select(ap, 1);
+	if (dev0)
+		ap->ops->dev_select(ap, 0);
+}
+
+static unsigned int ata_bus_softreset(struct ata_port *ap,
+				      unsigned int devmask)
+{
+	struct ata_ioports *ioaddr = &ap->ioaddr;
+
+	DPRINTK("ata%u: bus reset via SRST\n", ap->id);
+
+	/* software reset.  causes dev0 to be selected */
+	if (ap->flags & ATA_FLAG_MMIO) {
+		writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
+		udelay(20);	/* FIXME: flush */
+		writeb(ap->ctl | ATA_SRST, (void __iomem *) ioaddr->ctl_addr);
+		udelay(20);	/* FIXME: flush */
+		writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
+	} else {
+		outb(ap->ctl, ioaddr->ctl_addr);
+		udelay(10);
+		outb(ap->ctl | ATA_SRST, ioaddr->ctl_addr);
+		udelay(10);
+		outb(ap->ctl, ioaddr->ctl_addr);
+	}
+
+	/* spec mandates ">= 2ms" before checking status.
+	 * We wait 150ms, because that was the magic delay used for
+	 * ATAPI devices in Hale Landis's ATADRVR, for the period of time
+	 * between when the ATA command register is written, and then
+	 * status is checked.  Because waiting for "a while" before
+	 * checking status is fine, post SRST, we perform this magic
+	 * delay here as well.
+	 *
+	 * Old drivers/ide uses the 2mS rule and then waits for ready
+	 */
+	msleep(150);
+
+	/* Before we perform post reset processing we want to see if
+	 * the bus shows 0xFF because the odd clown forgets the D7
+	 * pulldown resistor.
+	 */
+	if (ata_check_status(ap) == 0xFF) {
+		ata_port_printk(ap, KERN_ERR, "SRST failed (status 0xFF)\n");
+		return AC_ERR_OTHER;
+	}
+
+	ata_bus_post_reset(ap, devmask);
+
+	return 0;
+}
+
+/**
+ *	ata_bus_reset - reset host port and associated ATA channel
+ *	@ap: port to reset
+ *
+ *	This is typically the first time we actually start issuing
+ *	commands to the ATA channel.  We wait for BSY to clear, then
+ *	issue EXECUTE DEVICE DIAGNOSTIC command, polling for its
+ *	result.  Determine what devices, if any, are on the channel
+ *	by looking at the device 0/1 error register.  Look at the signature
+ *	stored in each device's taskfile registers, to determine if
+ *	the device is ATA or ATAPI.
+ *
+ *	LOCKING:
+ *	PCI/etc. bus probe sem.
+ *	Obtains host_set lock.
+ *
+ *	SIDE EFFECTS:
+ *	Sets ATA_FLAG_DISABLED if bus reset fails.
+ */
+
+void ata_bus_reset(struct ata_port *ap)
+{
+	struct ata_ioports *ioaddr = &ap->ioaddr;
+	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
+	u8 err;
+	unsigned int dev0, dev1 = 0, devmask = 0;
+
+	DPRINTK("ENTER, host %u, port %u\n", ap->id, ap->port_no);
+
+	/* determine if device 0/1 are present */
+	if (ap->flags & ATA_FLAG_SATA_RESET)
+		dev0 = 1;
+	else {
+		dev0 = ata_devchk(ap, 0);
+		if (slave_possible)
+			dev1 = ata_devchk(ap, 1);
+	}
+
+	if (dev0)
+		devmask |= (1 << 0);
+	if (dev1)
+		devmask |= (1 << 1);
+
+	/* select device 0 again */
+	ap->ops->dev_select(ap, 0);
+
+	/* issue bus reset */
+	if (ap->flags & ATA_FLAG_SRST)
+		if (ata_bus_softreset(ap, devmask))
+			goto err_out;
+
+	/*
+	 * determine by signature whether we have ATA or ATAPI devices
+	 */
+	ap->device[0].class = ata_dev_try_classify(ap, 0, &err);
+	if ((slave_possible) && (err != 0x81))
+		ap->device[1].class = ata_dev_try_classify(ap, 1, &err);
+
+	/* re-enable interrupts */
+	if (ap->ioaddr.ctl_addr)	/* FIXME: hack. create a hook instead */
+		ata_irq_on(ap);
+
+	/* is double-select really necessary? */
+	if (ap->device[1].class != ATA_DEV_NONE)
+		ap->ops->dev_select(ap, 1);
+	if (ap->device[0].class != ATA_DEV_NONE)
+		ap->ops->dev_select(ap, 0);
+
+	/* if no devices were detected, disable this port */
+	if ((ap->device[0].class == ATA_DEV_NONE) &&
+	    (ap->device[1].class == ATA_DEV_NONE))
+		goto err_out;
+
+	if (ap->flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST)) {
+		/* set up device control for ATA_FLAG_SATA_RESET */
+		if (ap->flags & ATA_FLAG_MMIO)
+			writeb(ap->ctl, (void __iomem *) ioaddr->ctl_addr);
+		else
+			outb(ap->ctl, ioaddr->ctl_addr);
+	}
+
+	DPRINTK("EXIT\n");
+	return;
+
+err_out:
+	ata_port_printk(ap, KERN_ERR, "disabling port\n");
+	ap->ops->port_disable(ap);
+
+	DPRINTK("EXIT\n");
+}
+
+/**
+ *	sata_phy_debounce - debounce SATA phy status
+ *	@ap: ATA port to debounce SATA phy status for
+ *	@params: timing parameters { interval, duratinon, timeout } in msec
+ *
+ *	Make sure SStatus of @ap reaches stable state, determined by
+ *	holding the same value where DET is not 1 for @duration polled
+ *	every @interval, before @timeout.  Timeout constraints the
+ *	beginning of the stable state.  Because, after hot unplugging,
+ *	DET gets stuck at 1 on some controllers, this functions waits
+ *	until timeout then returns 0 if DET is stable at 1.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, -errno on failure.
+ */
+int sata_phy_debounce(struct ata_port *ap, const unsigned long *params)
+{
+	unsigned long interval_msec = params[0];
+	unsigned long duration = params[1] * HZ / 1000;
+	unsigned long timeout = jiffies + params[2] * HZ / 1000;
+	unsigned long last_jiffies;
+	u32 last, cur;
+	int rc;
+
+	if ((rc = sata_scr_read(ap, SCR_STATUS, &cur)))
+		return rc;
+	cur &= 0xf;
+
+	last = cur;
+	last_jiffies = jiffies;
+
+	while (1) {
+		msleep(interval_msec);
+		if ((rc = sata_scr_read(ap, SCR_STATUS, &cur)))
+			return rc;
+		cur &= 0xf;
+
+		/* DET stable? */
+		if (cur == last) {
+			if (cur == 1 && time_before(jiffies, timeout))
+				continue;
+			if (time_after(jiffies, last_jiffies + duration))
+				return 0;
+			continue;
+		}
+
+		/* unstable, start over */
+		last = cur;
+		last_jiffies = jiffies;
+
+		/* check timeout */
+		if (time_after(jiffies, timeout))
+			return -EBUSY;
+	}
+}
+
+/**
+ *	sata_phy_resume - resume SATA phy
+ *	@ap: ATA port to resume SATA phy for
+ *	@params: timing parameters { interval, duratinon, timeout } in msec
+ *
+ *	Resume SATA phy of @ap and debounce it.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, -errno on failure.
+ */
+int sata_phy_resume(struct ata_port *ap, const unsigned long *params)
+{
+	u32 scontrol;
+	int rc;
+
+	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
+		return rc;
+
+	scontrol = (scontrol & 0x0f0) | 0x300;
+
+	if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
+		return rc;
+
+	/* Some PHYs react badly if SStatus is pounded immediately
+	 * after resuming.  Delay 200ms before debouncing.
+	 */
+	msleep(200);
+
+	return sata_phy_debounce(ap, params);
+}
+
+static void ata_wait_spinup(struct ata_port *ap)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+	unsigned long end, secs;
+	int rc;
+
+	/* first, debounce phy if SATA */
+	if (ap->cbl == ATA_CBL_SATA) {
+		rc = sata_phy_debounce(ap, sata_deb_timing_hotplug);
+
+		/* if debounced successfully and offline, no need to wait */
+		if ((rc == 0 || rc == -EOPNOTSUPP) && ata_port_offline(ap))
+			return;
+	}
+
+	/* okay, let's give the drive time to spin up */
+	end = ehc->i.hotplug_timestamp + ATA_SPINUP_WAIT * HZ / 1000;
+	secs = ((end - jiffies) + HZ - 1) / HZ;
+
+	if (time_after(jiffies, end))
+		return;
+
+	if (secs > 5)
+		ata_port_printk(ap, KERN_INFO, "waiting for device to spin up "
+				"(%lu secs)\n", secs);
+
+	schedule_timeout_uninterruptible(end - jiffies);
+}
+
+/**
+ *	ata_std_prereset - prepare for reset
+ *	@ap: ATA port to be reset
+ *
+ *	@ap is about to be reset.  Initialize it.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise.
+ */
+int ata_std_prereset(struct ata_port *ap)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+	const unsigned long *timing = sata_ehc_deb_timing(ehc);
+	int rc;
+
+	/* handle link resume & hotplug spinup */
+	if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
+	    (ap->flags & ATA_FLAG_HRST_TO_RESUME))
+		ehc->i.action |= ATA_EH_HARDRESET;
+
+	if ((ehc->i.flags & ATA_EHI_HOTPLUGGED) &&
+	    (ap->flags & ATA_FLAG_SKIP_D2H_BSY))
+		ata_wait_spinup(ap);
+
+	/* if we're about to do hardreset, nothing more to do */
+	if (ehc->i.action & ATA_EH_HARDRESET)
+		return 0;
+
+	/* if SATA, resume phy */
+	if (ap->cbl == ATA_CBL_SATA) {
+		rc = sata_phy_resume(ap, timing);
+		if (rc && rc != -EOPNOTSUPP) {
+			/* phy resume failed */
+			ata_port_printk(ap, KERN_WARNING, "failed to resume "
+					"link for reset (errno=%d)\n", rc);
+			return rc;
+		}
+	}
+
+	/* Wait for !BSY if the controller can wait for the first D2H
+	 * Reg FIS and we don't know that no device is attached.
+	 */
+	if (!(ap->flags & ATA_FLAG_SKIP_D2H_BSY) && !ata_port_offline(ap))
+		ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT);
+
+	return 0;
+}
+
+/**
+ *	ata_std_softreset - reset host port via ATA SRST
+ *	@ap: port to reset
+ *	@classes: resulting classes of attached devices
+ *
+ *	Reset host port using ATA SRST.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise.
+ */
+int ata_std_softreset(struct ata_port *ap, unsigned int *classes)
+{
+	unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
+	unsigned int devmask = 0, err_mask;
+	u8 err;
+
+	DPRINTK("ENTER\n");
+
+	if (ata_port_offline(ap)) {
+		classes[0] = ATA_DEV_NONE;
+		goto out;
+	}
+
+	/* determine if device 0/1 are present */
+	if (ata_devchk(ap, 0))
+		devmask |= (1 << 0);
+	if (slave_possible && ata_devchk(ap, 1))
+		devmask |= (1 << 1);
+
+	/* select device 0 again */
+	ap->ops->dev_select(ap, 0);
+
+	/* issue bus reset */
+	DPRINTK("about to softreset, devmask=%x\n", devmask);
+	err_mask = ata_bus_softreset(ap, devmask);
+	if (err_mask) {
+		ata_port_printk(ap, KERN_ERR, "SRST failed (err_mask=0x%x)\n",
+				err_mask);
+		return -EIO;
+	}
+
+	/* determine by signature whether we have ATA or ATAPI devices */
+	classes[0] = ata_dev_try_classify(ap, 0, &err);
+	if (slave_possible && err != 0x81)
+		classes[1] = ata_dev_try_classify(ap, 1, &err);
+
+ out:
+	DPRINTK("EXIT, classes[0]=%u [1]=%u\n", classes[0], classes[1]);
+	return 0;
+}
+
+/**
+ *	sata_std_hardreset - reset host port via SATA phy reset
+ *	@ap: port to reset
+ *	@class: resulting class of attached device
+ *
+ *	SATA phy-reset host port using DET bits of SControl register.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise.
+ */
+int sata_std_hardreset(struct ata_port *ap, unsigned int *class)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+	const unsigned long *timing = sata_ehc_deb_timing(ehc);
+	u32 scontrol;
+	int rc;
+
+	DPRINTK("ENTER\n");
+
+	if (sata_set_spd_needed(ap)) {
+		/* SATA spec says nothing about how to reconfigure
+		 * spd.  To be on the safe side, turn off phy during
+		 * reconfiguration.  This works for at least ICH7 AHCI
+		 * and Sil3124.
+		 */
+		if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
+			return rc;
+
+		scontrol = (scontrol & 0x0f0) | 0x302;
+
+		if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
+			return rc;
+
+		sata_set_spd(ap);
+	}
+
+	/* issue phy wake/reset */
+	if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
+		return rc;
+
+	scontrol = (scontrol & 0x0f0) | 0x301;
+
+	if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
+		return rc;
+
+	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
+	 * 10.4.2 says at least 1 ms.
+	 */
+	msleep(1);
+
+	/* bring phy back */
+	sata_phy_resume(ap, timing);
+
+	/* TODO: phy layer with polling, timeouts, etc. */
+	if (ata_port_offline(ap)) {
+		*class = ATA_DEV_NONE;
+		DPRINTK("EXIT, link offline\n");
+		return 0;
+	}
+
+	if (ata_busy_sleep(ap, ATA_TMOUT_BOOT_QUICK, ATA_TMOUT_BOOT)) {
+		ata_port_printk(ap, KERN_ERR,
+				"COMRESET failed (device not ready)\n");
+		return -EIO;
+	}
+
+	ap->ops->dev_select(ap, 0);	/* probably unnecessary */
+
+	*class = ata_dev_try_classify(ap, 0, NULL);
+
+	DPRINTK("EXIT, class=%u\n", *class);
+	return 0;
+}
+
+/**
+ *	ata_std_postreset - standard postreset callback
+ *	@ap: the target ata_port
+ *	@classes: classes of attached devices
+ *
+ *	This function is invoked after a successful reset.  Note that
+ *	the device might have been reset more than once using
+ *	different reset methods before postreset is invoked.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ */
+void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
+{
+	u32 serror;
+
+	DPRINTK("ENTER\n");
+
+	/* print link status */
+	sata_print_link_status(ap);
+
+	/* clear SError */
+	if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
+		sata_scr_write(ap, SCR_ERROR, serror);
+
+	/* re-enable interrupts */
+	if (!ap->ops->error_handler) {
+		/* FIXME: hack. create a hook instead */
+		if (ap->ioaddr.ctl_addr)
+			ata_irq_on(ap);
+	}
+
+	/* is double-select really necessary? */
+	if (classes[0] != ATA_DEV_NONE)
+		ap->ops->dev_select(ap, 1);
+	if (classes[1] != ATA_DEV_NONE)
+		ap->ops->dev_select(ap, 0);
+
+	/* bail out if no device is present */
+	if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
+		DPRINTK("EXIT, no device\n");
+		return;
+	}
+
+	/* set up device control */
+	if (ap->ioaddr.ctl_addr) {
+		if (ap->flags & ATA_FLAG_MMIO)
+			writeb(ap->ctl, (void __iomem *) ap->ioaddr.ctl_addr);
+		else
+			outb(ap->ctl, ap->ioaddr.ctl_addr);
+	}
+
+	DPRINTK("EXIT\n");
+}
+
+/**
+ *	ata_dev_same_device - Determine whether new ID matches configured device
+ *	@dev: device to compare against
+ *	@new_class: class of the new device
+ *	@new_id: IDENTIFY page of the new device
+ *
+ *	Compare @new_class and @new_id against @dev and determine
+ *	whether @dev is the device indicated by @new_class and
+ *	@new_id.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	1 if @dev matches @new_class and @new_id, 0 otherwise.
+ */
+static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
+			       const u16 *new_id)
+{
+	const u16 *old_id = dev->id;
+	unsigned char model[2][41], serial[2][21];
+	u64 new_n_sectors;
+
+	if (dev->class != new_class) {
+		ata_dev_printk(dev, KERN_INFO, "class mismatch %d != %d\n",
+			       dev->class, new_class);
+		return 0;
+	}
+
+	ata_id_c_string(old_id, model[0], ATA_ID_PROD_OFS, sizeof(model[0]));
+	ata_id_c_string(new_id, model[1], ATA_ID_PROD_OFS, sizeof(model[1]));
+	ata_id_c_string(old_id, serial[0], ATA_ID_SERNO_OFS, sizeof(serial[0]));
+	ata_id_c_string(new_id, serial[1], ATA_ID_SERNO_OFS, sizeof(serial[1]));
+	new_n_sectors = ata_id_n_sectors(new_id);
+
+	if (strcmp(model[0], model[1])) {
+		ata_dev_printk(dev, KERN_INFO, "model number mismatch "
+			       "'%s' != '%s'\n", model[0], model[1]);
+		return 0;
+	}
+
+	if (strcmp(serial[0], serial[1])) {
+		ata_dev_printk(dev, KERN_INFO, "serial number mismatch "
+			       "'%s' != '%s'\n", serial[0], serial[1]);
+		return 0;
+	}
+
+	if (dev->class == ATA_DEV_ATA && dev->n_sectors != new_n_sectors) {
+		ata_dev_printk(dev, KERN_INFO, "n_sectors mismatch "
+			       "%llu != %llu\n",
+			       (unsigned long long)dev->n_sectors,
+			       (unsigned long long)new_n_sectors);
+		return 0;
+	}
+
+	return 1;
+}
+
+/**
+ *	ata_dev_revalidate - Revalidate ATA device
+ *	@dev: device to revalidate
+ *	@post_reset: is this revalidation after reset?
+ *
+ *	Re-read IDENTIFY page and make sure @dev is still attached to
+ *	the port.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, negative errno otherwise
+ */
+int ata_dev_revalidate(struct ata_device *dev, int post_reset)
+{
+	unsigned int class = dev->class;
+	u16 *id = (void *)dev->ap->sector_buf;
+	int rc;
+
+	if (!ata_dev_enabled(dev)) {
+		rc = -ENODEV;
+		goto fail;
+	}
+
+	/* read ID data */
+	rc = ata_dev_read_id(dev, &class, post_reset, id);
+	if (rc)
+		goto fail;
+
+	/* is the device still there? */
+	if (!ata_dev_same_device(dev, class, id)) {
+		rc = -ENODEV;
+		goto fail;
+	}
+
+	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
+
+	/* configure device according to the new ID */
+	rc = ata_dev_configure(dev, 0);
+	if (rc == 0)
+		return 0;
+
+ fail:
+	ata_dev_printk(dev, KERN_ERR, "revalidation failed (errno=%d)\n", rc);
+	return rc;
+}
+
+static const char * const ata_dma_blacklist [] = {
+	"WDC AC11000H", NULL,
+	"WDC AC22100H", NULL,
+	"WDC AC32500H", NULL,
+	"WDC AC33100H", NULL,
+	"WDC AC31600H", NULL,
+	"WDC AC32100H", "24.09P07",
+	"WDC AC23200L", "21.10N21",
+	"Compaq CRD-8241B",  NULL,
+	"CRD-8400B", NULL,
+	"CRD-8480B", NULL,
+	"CRD-8482B", NULL,
+ 	"CRD-84", NULL,
+	"SanDisk SDP3B", NULL,
+	"SanDisk SDP3B-64", NULL,
+	"SANYO CD-ROM CRD", NULL,
+	"HITACHI CDR-8", NULL,
+	"HITACHI CDR-8335", NULL,
+	"HITACHI CDR-8435", NULL,
+	"Toshiba CD-ROM XM-6202B", NULL,
+	"TOSHIBA CD-ROM XM-1702BC", NULL,
+	"CD-532E-A", NULL,
+	"E-IDE CD-ROM CR-840", NULL,
+	"CD-ROM Drive/F5A", NULL,
+	"WPI CDD-820", NULL,
+	"SAMSUNG CD-ROM SC-148C", NULL,
+	"SAMSUNG CD-ROM SC", NULL,
+	"SanDisk SDP3B-64", NULL,
+	"ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,
+	"_NEC DV5800A", NULL,
+	"SAMSUNG CD-ROM SN-124", "N001"
+};
+
+static int ata_strim(char *s, size_t len)
+{
+	len = strnlen(s, len);
+
+	/* ATAPI specifies that empty space is blank-filled; remove blanks */
+	while ((len > 0) && (s[len - 1] == ' ')) {
+		len--;
+		s[len] = 0;
+	}
+	return len;
+}
+
+static int ata_dma_blacklisted(const struct ata_device *dev)
+{
+	unsigned char model_num[40];
+	unsigned char model_rev[16];
+	unsigned int nlen, rlen;
+	int i;
+
+	/* We don't support polling DMA.
+	 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
+	 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
+	 */
+	if ((dev->ap->flags & ATA_FLAG_PIO_POLLING) &&
+	    (dev->flags & ATA_DFLAG_CDB_INTR))
+		return 1;
+
+	ata_id_string(dev->id, model_num, ATA_ID_PROD_OFS,
+			  sizeof(model_num));
+	ata_id_string(dev->id, model_rev, ATA_ID_FW_REV_OFS,
+			  sizeof(model_rev));
+	nlen = ata_strim(model_num, sizeof(model_num));
+	rlen = ata_strim(model_rev, sizeof(model_rev));
+
+	for (i = 0; i < ARRAY_SIZE(ata_dma_blacklist); i += 2) {
+		if (!strncmp(ata_dma_blacklist[i], model_num, nlen)) {
+			if (ata_dma_blacklist[i+1] == NULL)
+				return 1;
+			if (!strncmp(ata_dma_blacklist[i], model_rev, rlen))
+				return 1;
+		}
+	}
+	return 0;
+}
+
+/**
+ *	ata_dev_xfermask - Compute supported xfermask of the given device
+ *	@dev: Device to compute xfermask for
+ *
+ *	Compute supported xfermask of @dev and store it in
+ *	dev->*_mask.  This function is responsible for applying all
+ *	known limits including host controller limits, device
+ *	blacklist, etc...
+ *
+ *	LOCKING:
+ *	None.
+ */
+static void ata_dev_xfermask(struct ata_device *dev)
+{
+	struct ata_port *ap = dev->ap;
+	struct ata_host_set *hs = ap->host_set;
+	unsigned long xfer_mask;
+
+	/* controller modes available */
+	xfer_mask = ata_pack_xfermask(ap->pio_mask,
+				      ap->mwdma_mask, ap->udma_mask);
+
+	/* Apply cable rule here.  Don't apply it early because when
+	 * we handle hot plug the cable type can itself change.
+	 */
+	if (ap->cbl == ATA_CBL_PATA40)
+		xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
+
+	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
+				       dev->mwdma_mask, dev->udma_mask);
+	xfer_mask &= ata_id_xfermask(dev->id);
+
+	if (ata_dma_blacklisted(dev)) {
+		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
+		ata_dev_printk(dev, KERN_WARNING,
+			       "device is on DMA blacklist, disabling DMA\n");
+	}
+
+	if ((hs->flags & ATA_HOST_SIMPLEX) && hs->simplex_claimed) {
+		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
+		ata_dev_printk(dev, KERN_WARNING, "simplex DMA is claimed by "
+			       "other device, disabling DMA\n");
+	}
+
+	if (ap->ops->mode_filter)
+		xfer_mask = ap->ops->mode_filter(ap, dev, xfer_mask);
+
+	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
+			    &dev->mwdma_mask, &dev->udma_mask);
+}
+
+/**
+ *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
+ *	@dev: Device to which command will be sent
+ *
+ *	Issue SET FEATURES - XFER MODE command to device @dev
+ *	on port @ap.
+ *
+ *	LOCKING:
+ *	PCI/etc. bus probe sem.
+ *
+ *	RETURNS:
+ *	0 on success, AC_ERR_* mask otherwise.
+ */
+
+static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
+{
+	struct ata_taskfile tf;
+	unsigned int err_mask;
+
+	/* set up set-features taskfile */
+	DPRINTK("set features - xfer mode\n");
+
+	ata_tf_init(dev, &tf);
+	tf.command = ATA_CMD_SET_FEATURES;
+	tf.feature = SETFEATURES_XFER;
+	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+	tf.protocol = ATA_PROT_NODATA;
+	tf.nsect = dev->xfer_mode;
+
+	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
+
+	DPRINTK("EXIT, err_mask=%x\n", err_mask);
+	return err_mask;
+}
+
+/**
+ *	ata_dev_init_params - Issue INIT DEV PARAMS command
+ *	@dev: Device to which command will be sent
+ *	@heads: Number of heads (taskfile parameter)
+ *	@sectors: Number of sectors (taskfile parameter)
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	0 on success, AC_ERR_* mask otherwise.
+ */
+static unsigned int ata_dev_init_params(struct ata_device *dev,
+					u16 heads, u16 sectors)
+{
+	struct ata_taskfile tf;
+	unsigned int err_mask;
+
+	/* Number of sectors per track 1-255. Number of heads 1-16 */
+	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
+		return AC_ERR_INVALID;
+
+	/* set up init dev params taskfile */
+	DPRINTK("init dev params \n");
+
+	ata_tf_init(dev, &tf);
+	tf.command = ATA_CMD_INIT_DEV_PARAMS;
+	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+	tf.protocol = ATA_PROT_NODATA;
+	tf.nsect = sectors;
+	tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
+
+	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0);
+
+	DPRINTK("EXIT, err_mask=%x\n", err_mask);
+	return err_mask;
+}
+
+/**
+ *	ata_sg_clean - Unmap DMA memory associated with command
+ *	@qc: Command containing DMA memory to be released
+ *
+ *	Unmap all mapped DMA memory associated with this command.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+static void ata_sg_clean(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct scatterlist *sg = qc->__sg;
+	int dir = qc->dma_dir;
+	void *pad_buf = NULL;
+
+	WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
+	WARN_ON(sg == NULL);
+
+	if (qc->flags & ATA_QCFLAG_SINGLE)
+		WARN_ON(qc->n_elem > 1);
+
+	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
+
+	/* if we padded the buffer out to 32-bit bound, and data
+	 * xfer direction is from-device, we must copy from the
+	 * pad buffer back into the supplied buffer
+	 */
+	if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
+		pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
+
+	if (qc->flags & ATA_QCFLAG_SG) {
+		if (qc->n_elem)
+			dma_unmap_sg(ap->dev, sg, qc->n_elem, dir);
+		/* restore last sg */
+		sg[qc->orig_n_elem - 1].length += qc->pad_len;
+		if (pad_buf) {
+			struct scatterlist *psg = &qc->pad_sgent;
+			void *addr = kmap_atomic(psg->page, KM_IRQ0);
+			memcpy(addr + psg->offset, pad_buf, qc->pad_len);
+			kunmap_atomic(addr, KM_IRQ0);
+		}
+	} else {
+		if (qc->n_elem)
+			dma_unmap_single(ap->dev,
+				sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
+				dir);
+		/* restore sg */
+		sg->length += qc->pad_len;
+		if (pad_buf)
+			memcpy(qc->buf_virt + sg->length - qc->pad_len,
+			       pad_buf, qc->pad_len);
+	}
+
+	qc->flags &= ~ATA_QCFLAG_DMAMAP;
+	qc->__sg = NULL;
+}
+
+/**
+ *	ata_fill_sg - Fill PCI IDE PRD table
+ *	@qc: Metadata associated with taskfile to be transferred
+ *
+ *	Fill PCI IDE PRD (scatter-gather) table with segments
+ *	associated with the current disk command.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ */
+static void ata_fill_sg(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct scatterlist *sg;
+	unsigned int idx;
+
+	WARN_ON(qc->__sg == NULL);
+	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
+
+	idx = 0;
+	ata_for_each_sg(sg, qc) {
+		u32 addr, offset;
+		u32 sg_len, len;
+
+		/* determine if physical DMA addr spans 64K boundary.
+		 * Note h/w doesn't support 64-bit, so we unconditionally
+		 * truncate dma_addr_t to u32.
+		 */
+		addr = (u32) sg_dma_address(sg);
+		sg_len = sg_dma_len(sg);
+
+		while (sg_len) {
+			offset = addr & 0xffff;
+			len = sg_len;
+			if ((offset + sg_len) > 0x10000)
+				len = 0x10000 - offset;
+
+			ap->prd[idx].addr = cpu_to_le32(addr);
+			ap->prd[idx].flags_len = cpu_to_le32(len & 0xffff);
+			VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", idx, addr, len);
+
+			idx++;
+			sg_len -= len;
+			addr += len;
+		}
+	}
+
+	if (idx)
+		ap->prd[idx - 1].flags_len |= cpu_to_le32(ATA_PRD_EOT);
+}
+/**
+ *	ata_check_atapi_dma - Check whether ATAPI DMA can be supported
+ *	@qc: Metadata associated with taskfile to check
+ *
+ *	Allow low-level driver to filter ATA PACKET commands, returning
+ *	a status indicating whether or not it is OK to use DMA for the
+ *	supplied PACKET command.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS: 0 when ATAPI DMA can be used
+ *               nonzero otherwise
+ */
+int ata_check_atapi_dma(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	int rc = 0; /* Assume ATAPI DMA is OK by default */
+
+	if (ap->ops->check_atapi_dma)
+		rc = ap->ops->check_atapi_dma(qc);
+
+	return rc;
+}
+/**
+ *	ata_qc_prep - Prepare taskfile for submission
+ *	@qc: Metadata associated with taskfile to be prepared
+ *
+ *	Prepare ATA taskfile for submission.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+void ata_qc_prep(struct ata_queued_cmd *qc)
+{
+	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
+		return;
+
+	ata_fill_sg(qc);
+}
+
+void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
+
+/**
+ *	ata_sg_init_one - Associate command with memory buffer
+ *	@qc: Command to be associated
+ *	@buf: Memory buffer
+ *	@buflen: Length of memory buffer, in bytes.
+ *
+ *	Initialize the data-related elements of queued_cmd @qc
+ *	to point to a single memory buffer, @buf of byte length @buflen.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
+{
+	struct scatterlist *sg;
+
+	qc->flags |= ATA_QCFLAG_SINGLE;
+
+	memset(&qc->sgent, 0, sizeof(qc->sgent));
+	qc->__sg = &qc->sgent;
+	qc->n_elem = 1;
+	qc->orig_n_elem = 1;
+	qc->buf_virt = buf;
+	qc->nbytes = buflen;
+
+	sg = qc->__sg;
+	sg_init_one(sg, buf, buflen);
+}
+
+/**
+ *	ata_sg_init - Associate command with scatter-gather table.
+ *	@qc: Command to be associated
+ *	@sg: Scatter-gather table.
+ *	@n_elem: Number of elements in s/g table.
+ *
+ *	Initialize the data-related elements of queued_cmd @qc
+ *	to point to a scatter-gather table @sg, containing @n_elem
+ *	elements.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
+		 unsigned int n_elem)
+{
+	qc->flags |= ATA_QCFLAG_SG;
+	qc->__sg = sg;
+	qc->n_elem = n_elem;
+	qc->orig_n_elem = n_elem;
+}
+
+/**
+ *	ata_sg_setup_one - DMA-map the memory buffer associated with a command.
+ *	@qc: Command with memory buffer to be mapped.
+ *
+ *	DMA-map the memory buffer associated with queued_cmd @qc.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	Zero on success, negative on error.
+ */
+
+static int ata_sg_setup_one(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	int dir = qc->dma_dir;
+	struct scatterlist *sg = qc->__sg;
+	dma_addr_t dma_address;
+	int trim_sg = 0;
+
+	/* we must lengthen transfers to end on a 32-bit boundary */
+	qc->pad_len = sg->length & 3;
+	if (qc->pad_len) {
+		void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
+		struct scatterlist *psg = &qc->pad_sgent;
+
+		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
+
+		memset(pad_buf, 0, ATA_DMA_PAD_SZ);
+
+		if (qc->tf.flags & ATA_TFLAG_WRITE)
+			memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
+			       qc->pad_len);
+
+		sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
+		sg_dma_len(psg) = ATA_DMA_PAD_SZ;
+		/* trim sg */
+		sg->length -= qc->pad_len;
+		if (sg->length == 0)
+			trim_sg = 1;
+
+		DPRINTK("padding done, sg->length=%u pad_len=%u\n",
+			sg->length, qc->pad_len);
+	}
+
+	if (trim_sg) {
+		qc->n_elem--;
+		goto skip_map;
+	}
+
+	dma_address = dma_map_single(ap->dev, qc->buf_virt,
+				     sg->length, dir);
+	if (dma_mapping_error(dma_address)) {
+		/* restore sg */
+		sg->length += qc->pad_len;
+		return -1;
+	}
+
+	sg_dma_address(sg) = dma_address;
+	sg_dma_len(sg) = sg->length;
+
+skip_map:
+	DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
+		qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
+
+	return 0;
+}
+
+/**
+ *	ata_sg_setup - DMA-map the scatter-gather table associated with a command.
+ *	@qc: Command with scatter-gather table to be mapped.
+ *
+ *	DMA-map the scatter-gather table associated with queued_cmd @qc.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	Zero on success, negative on error.
+ *
+ */
+
+static int ata_sg_setup(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct scatterlist *sg = qc->__sg;
+	struct scatterlist *lsg = &sg[qc->n_elem - 1];
+	int n_elem, pre_n_elem, dir, trim_sg = 0;
+
+	VPRINTK("ENTER, ata%u\n", ap->id);
+	WARN_ON(!(qc->flags & ATA_QCFLAG_SG));
+
+	/* we must lengthen transfers to end on a 32-bit boundary */
+	qc->pad_len = lsg->length & 3;
+	if (qc->pad_len) {
+		void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
+		struct scatterlist *psg = &qc->pad_sgent;
+		unsigned int offset;
+
+		WARN_ON(qc->dev->class != ATA_DEV_ATAPI);
+
+		memset(pad_buf, 0, ATA_DMA_PAD_SZ);
+
+		/*
+		 * psg->page/offset are used to copy to-be-written
+		 * data in this function or read data in ata_sg_clean.
+		 */
+		offset = lsg->offset + lsg->length - qc->pad_len;
+		psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
+		psg->offset = offset_in_page(offset);
+
+		if (qc->tf.flags & ATA_TFLAG_WRITE) {
+			void *addr = kmap_atomic(psg->page, KM_IRQ0);
+			memcpy(pad_buf, addr + psg->offset, qc->pad_len);
+			kunmap_atomic(addr, KM_IRQ0);
+		}
+
+		sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
+		sg_dma_len(psg) = ATA_DMA_PAD_SZ;
+		/* trim last sg */
+		lsg->length -= qc->pad_len;
+		if (lsg->length == 0)
+			trim_sg = 1;
+
+		DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
+			qc->n_elem - 1, lsg->length, qc->pad_len);
+	}
+
+	pre_n_elem = qc->n_elem;
+	if (trim_sg && pre_n_elem)
+		pre_n_elem--;
+
+	if (!pre_n_elem) {
+		n_elem = 0;
+		goto skip_map;
+	}
+
+	dir = qc->dma_dir;
+	n_elem = dma_map_sg(ap->dev, sg, pre_n_elem, dir);
+	if (n_elem < 1) {
+		/* restore last sg */
+		lsg->length += qc->pad_len;
+		return -1;
+	}
+
+	DPRINTK("%d sg elements mapped\n", n_elem);
+
+skip_map:
+	qc->n_elem = n_elem;
+
+	return 0;
+}
+
+/**
+ *	swap_buf_le16 - swap halves of 16-bit words in place
+ *	@buf:  Buffer to swap
+ *	@buf_words:  Number of 16-bit words in buffer.
+ *
+ *	Swap halves of 16-bit words if needed to convert from
+ *	little-endian byte order to native cpu byte order, or
+ *	vice-versa.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+void swap_buf_le16(u16 *buf, unsigned int buf_words)
+{
+#ifdef __BIG_ENDIAN
+	unsigned int i;
+
+	for (i = 0; i < buf_words; i++)
+		buf[i] = le16_to_cpu(buf[i]);
+#endif /* __BIG_ENDIAN */
+}
+
+/**
+ *	ata_mmio_data_xfer - Transfer data by MMIO
+ *	@adev: device for this I/O
+ *	@buf: data buffer
+ *	@buflen: buffer length
+ *	@write_data: read/write
+ *
+ *	Transfer data from/to the device data register by MMIO.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+
+void ata_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
+			unsigned int buflen, int write_data)
+{
+	struct ata_port *ap = adev->ap;
+	unsigned int i;
+	unsigned int words = buflen >> 1;
+	u16 *buf16 = (u16 *) buf;
+	void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr;
+
+	/* Transfer multiple of 2 bytes */
+	if (write_data) {
+		for (i = 0; i < words; i++)
+			writew(le16_to_cpu(buf16[i]), mmio);
+	} else {
+		for (i = 0; i < words; i++)
+			buf16[i] = cpu_to_le16(readw(mmio));
+	}
+
+	/* Transfer trailing 1 byte, if any. */
+	if (unlikely(buflen & 0x01)) {
+		u16 align_buf[1] = { 0 };
+		unsigned char *trailing_buf = buf + buflen - 1;
+
+		if (write_data) {
+			memcpy(align_buf, trailing_buf, 1);
+			writew(le16_to_cpu(align_buf[0]), mmio);
+		} else {
+			align_buf[0] = cpu_to_le16(readw(mmio));
+			memcpy(trailing_buf, align_buf, 1);
+		}
+	}
+}
+
+/**
+ *	ata_pio_data_xfer - Transfer data by PIO
+ *	@adev: device to target
+ *	@buf: data buffer
+ *	@buflen: buffer length
+ *	@write_data: read/write
+ *
+ *	Transfer data from/to the device data register by PIO.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+
+void ata_pio_data_xfer(struct ata_device *adev, unsigned char *buf,
+		       unsigned int buflen, int write_data)
+{
+	struct ata_port *ap = adev->ap;
+	unsigned int words = buflen >> 1;
+
+	/* Transfer multiple of 2 bytes */
+	if (write_data)
+		outsw(ap->ioaddr.data_addr, buf, words);
+	else
+		insw(ap->ioaddr.data_addr, buf, words);
+
+	/* Transfer trailing 1 byte, if any. */
+	if (unlikely(buflen & 0x01)) {
+		u16 align_buf[1] = { 0 };
+		unsigned char *trailing_buf = buf + buflen - 1;
+
+		if (write_data) {
+			memcpy(align_buf, trailing_buf, 1);
+			outw(le16_to_cpu(align_buf[0]), ap->ioaddr.data_addr);
+		} else {
+			align_buf[0] = cpu_to_le16(inw(ap->ioaddr.data_addr));
+			memcpy(trailing_buf, align_buf, 1);
+		}
+	}
+}
+
+/**
+ *	ata_pio_data_xfer_noirq - Transfer data by PIO
+ *	@adev: device to target
+ *	@buf: data buffer
+ *	@buflen: buffer length
+ *	@write_data: read/write
+ *
+ *	Transfer data from/to the device data register by PIO. Do the
+ *	transfer with interrupts disabled.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+
+void ata_pio_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
+				    unsigned int buflen, int write_data)
+{
+	unsigned long flags;
+	local_irq_save(flags);
+	ata_pio_data_xfer(adev, buf, buflen, write_data);
+	local_irq_restore(flags);
+}
+
+
+/**
+ *	ata_pio_sector - Transfer ATA_SECT_SIZE (512 bytes) of data.
+ *	@qc: Command on going
+ *
+ *	Transfer ATA_SECT_SIZE of data from/to the ATA device.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+
+static void ata_pio_sector(struct ata_queued_cmd *qc)
+{
+	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
+	struct scatterlist *sg = qc->__sg;
+	struct ata_port *ap = qc->ap;
+	struct page *page;
+	unsigned int offset;
+	unsigned char *buf;
+
+	if (qc->cursect == (qc->nsect - 1))
+		ap->hsm_task_state = HSM_ST_LAST;
+
+	page = sg[qc->cursg].page;
+	offset = sg[qc->cursg].offset + qc->cursg_ofs * ATA_SECT_SIZE;
+
+	/* get the current page and offset */
+	page = nth_page(page, (offset >> PAGE_SHIFT));
+	offset %= PAGE_SIZE;
+
+	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
+
+	if (PageHighMem(page)) {
+		unsigned long flags;
+
+		/* FIXME: use a bounce buffer */
+		local_irq_save(flags);
+		buf = kmap_atomic(page, KM_IRQ0);
+
+		/* do the actual data transfer */
+		ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
+
+		kunmap_atomic(buf, KM_IRQ0);
+		local_irq_restore(flags);
+	} else {
+		buf = page_address(page);
+		ap->ops->data_xfer(qc->dev, buf + offset, ATA_SECT_SIZE, do_write);
+	}
+
+	qc->cursect++;
+	qc->cursg_ofs++;
+
+	if ((qc->cursg_ofs * ATA_SECT_SIZE) == (&sg[qc->cursg])->length) {
+		qc->cursg++;
+		qc->cursg_ofs = 0;
+	}
+}
+
+/**
+ *	ata_pio_sectors - Transfer one or many 512-byte sectors.
+ *	@qc: Command on going
+ *
+ *	Transfer one or many ATA_SECT_SIZE of data from/to the
+ *	ATA device for the DRQ request.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+
+static void ata_pio_sectors(struct ata_queued_cmd *qc)
+{
+	if (is_multi_taskfile(&qc->tf)) {
+		/* READ/WRITE MULTIPLE */
+		unsigned int nsect;
+
+		WARN_ON(qc->dev->multi_count == 0);
+
+		nsect = min(qc->nsect - qc->cursect, qc->dev->multi_count);
+		while (nsect--)
+			ata_pio_sector(qc);
+	} else
+		ata_pio_sector(qc);
+}
+
+/**
+ *	atapi_send_cdb - Write CDB bytes to hardware
+ *	@ap: Port to which ATAPI device is attached.
+ *	@qc: Taskfile currently active
+ *
+ *	When device has indicated its readiness to accept
+ *	a CDB, this function is called.  Send the CDB.
+ *
+ *	LOCKING:
+ *	caller.
+ */
+
+static void atapi_send_cdb(struct ata_port *ap, struct ata_queued_cmd *qc)
+{
+	/* send SCSI cdb */
+	DPRINTK("send cdb\n");
+	WARN_ON(qc->dev->cdb_len < 12);
+
+	ap->ops->data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1);
+	ata_altstatus(ap); /* flush */
+
+	switch (qc->tf.protocol) {
+	case ATA_PROT_ATAPI:
+		ap->hsm_task_state = HSM_ST;
+		break;
+	case ATA_PROT_ATAPI_NODATA:
+		ap->hsm_task_state = HSM_ST_LAST;
+		break;
+	case ATA_PROT_ATAPI_DMA:
+		ap->hsm_task_state = HSM_ST_LAST;
+		/* initiate bmdma */
+		ap->ops->bmdma_start(qc);
+		break;
+	}
+}
+
+/**
+ *	__atapi_pio_bytes - Transfer data from/to the ATAPI device.
+ *	@qc: Command on going
+ *	@bytes: number of bytes
+ *
+ *	Transfer Transfer data from/to the ATAPI device.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ *
+ */
+
+static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
+{
+	int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
+	struct scatterlist *sg = qc->__sg;
+	struct ata_port *ap = qc->ap;
+	struct page *page;
+	unsigned char *buf;
+	unsigned int offset, count;
+
+	if (qc->curbytes + bytes >= qc->nbytes)
+		ap->hsm_task_state = HSM_ST_LAST;
+
+next_sg:
+	if (unlikely(qc->cursg >= qc->n_elem)) {
+		/*
+		 * The end of qc->sg is reached and the device expects
+		 * more data to transfer. In order not to overrun qc->sg
+		 * and fulfill length specified in the byte count register,
+		 *    - for read case, discard trailing data from the device
+		 *    - for write case, padding zero data to the device
+		 */
+		u16 pad_buf[1] = { 0 };
+		unsigned int words = bytes >> 1;
+		unsigned int i;
+
+		if (words) /* warning if bytes > 1 */
+			ata_dev_printk(qc->dev, KERN_WARNING,
+				       "%u bytes trailing data\n", bytes);
+
+		for (i = 0; i < words; i++)
+			ap->ops->data_xfer(qc->dev, (unsigned char*)pad_buf, 2, do_write);
+
+		ap->hsm_task_state = HSM_ST_LAST;
+		return;
+	}
+
+	sg = &qc->__sg[qc->cursg];
+
+	page = sg->page;
+	offset = sg->offset + qc->cursg_ofs;
+
+	/* get the current page and offset */
+	page = nth_page(page, (offset >> PAGE_SHIFT));
+	offset %= PAGE_SIZE;
+
+	/* don't overrun current sg */
+	count = min(sg->length - qc->cursg_ofs, bytes);
+
+	/* don't cross page boundaries */
+	count = min(count, (unsigned int)PAGE_SIZE - offset);
+
+	DPRINTK("data %s\n", qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");
+
+	if (PageHighMem(page)) {
+		unsigned long flags;
+
+		/* FIXME: use bounce buffer */
+		local_irq_save(flags);
+		buf = kmap_atomic(page, KM_IRQ0);
+
+		/* do the actual data transfer */
+		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
+
+		kunmap_atomic(buf, KM_IRQ0);
+		local_irq_restore(flags);
+	} else {
+		buf = page_address(page);
+		ap->ops->data_xfer(qc->dev,  buf + offset, count, do_write);
+	}
+
+	bytes -= count;
+	qc->curbytes += count;
+	qc->cursg_ofs += count;
+
+	if (qc->cursg_ofs == sg->length) {
+		qc->cursg++;
+		qc->cursg_ofs = 0;
+	}
+
+	if (bytes)
+		goto next_sg;
+}
+
+/**
+ *	atapi_pio_bytes - Transfer data from/to the ATAPI device.
+ *	@qc: Command on going
+ *
+ *	Transfer Transfer data from/to the ATAPI device.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+
+static void atapi_pio_bytes(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct ata_device *dev = qc->dev;
+	unsigned int ireason, bc_lo, bc_hi, bytes;
+	int i_write, do_write = (qc->tf.flags & ATA_TFLAG_WRITE) ? 1 : 0;
+
+	/* Abuse qc->result_tf for temp storage of intermediate TF
+	 * here to save some kernel stack usage.
+	 * For normal completion, qc->result_tf is not relevant. For
+	 * error, qc->result_tf is later overwritten by ata_qc_complete().
+	 * So, the correctness of qc->result_tf is not affected.
+	 */
+	ap->ops->tf_read(ap, &qc->result_tf);
+	ireason = qc->result_tf.nsect;
+	bc_lo = qc->result_tf.lbam;
+	bc_hi = qc->result_tf.lbah;
+	bytes = (bc_hi << 8) | bc_lo;
+
+	/* shall be cleared to zero, indicating xfer of data */
+	if (ireason & (1 << 0))
+		goto err_out;
+
+	/* make sure transfer direction matches expected */
+	i_write = ((ireason & (1 << 1)) == 0) ? 1 : 0;
+	if (do_write != i_write)
+		goto err_out;
+
+	VPRINTK("ata%u: xfering %d bytes\n", ap->id, bytes);
+
+	__atapi_pio_bytes(qc, bytes);
+
+	return;
+
+err_out:
+	ata_dev_printk(dev, KERN_INFO, "ATAPI check failed\n");
+	qc->err_mask |= AC_ERR_HSM;
+	ap->hsm_task_state = HSM_ST_ERR;
+}
+
+/**
+ *	ata_hsm_ok_in_wq - Check if the qc can be handled in the workqueue.
+ *	@ap: the target ata_port
+ *	@qc: qc on going
+ *
+ *	RETURNS:
+ *	1 if ok in workqueue, 0 otherwise.
+ */
+
+static inline int ata_hsm_ok_in_wq(struct ata_port *ap, struct ata_queued_cmd *qc)
+{
+	if (qc->tf.flags & ATA_TFLAG_POLLING)
+		return 1;
+
+	if (ap->hsm_task_state == HSM_ST_FIRST) {
+		if (qc->tf.protocol == ATA_PROT_PIO &&
+		    (qc->tf.flags & ATA_TFLAG_WRITE))
+		    return 1;
+
+		if (is_atapi_taskfile(&qc->tf) &&
+		    !(qc->dev->flags & ATA_DFLAG_CDB_INTR))
+			return 1;
+	}
+
+	return 0;
+}
+
+/**
+ *	ata_hsm_qc_complete - finish a qc running on standard HSM
+ *	@qc: Command to complete
+ *	@in_wq: 1 if called from workqueue, 0 otherwise
+ *
+ *	Finish @qc which is running on standard HSM.
+ *
+ *	LOCKING:
+ *	If @in_wq is zero, spin_lock_irqsave(host_set lock).
+ *	Otherwise, none on entry and grabs host lock.
+ */
+static void ata_hsm_qc_complete(struct ata_queued_cmd *qc, int in_wq)
+{
+	struct ata_port *ap = qc->ap;
+	unsigned long flags;
+
+	if (ap->ops->error_handler) {
+		if (in_wq) {
+			spin_lock_irqsave(ap->lock, flags);
+
+			/* EH might have kicked in while host_set lock
+			 * is released.
+			 */
+			qc = ata_qc_from_tag(ap, qc->tag);
+			if (qc) {
+				if (likely(!(qc->err_mask & AC_ERR_HSM))) {
+					ata_irq_on(ap);
+					ata_qc_complete(qc);
+				} else
+					ata_port_freeze(ap);
+			}
+
+			spin_unlock_irqrestore(ap->lock, flags);
+		} else {
+			if (likely(!(qc->err_mask & AC_ERR_HSM)))
+				ata_qc_complete(qc);
+			else
+				ata_port_freeze(ap);
+		}
+	} else {
+		if (in_wq) {
+			spin_lock_irqsave(ap->lock, flags);
+			ata_irq_on(ap);
+			ata_qc_complete(qc);
+			spin_unlock_irqrestore(ap->lock, flags);
+		} else
+			ata_qc_complete(qc);
+	}
+
+	ata_altstatus(ap); /* flush */
+}
+
+/**
+ *	ata_hsm_move - move the HSM to the next state.
+ *	@ap: the target ata_port
+ *	@qc: qc on going
+ *	@status: current device status
+ *	@in_wq: 1 if called from workqueue, 0 otherwise
+ *
+ *	RETURNS:
+ *	1 when poll next status needed, 0 otherwise.
+ */
+int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
+		 u8 status, int in_wq)
+{
+	unsigned long flags = 0;
+	int poll_next;
+
+	WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0);
+
+	/* Make sure ata_qc_issue_prot() does not throw things
+	 * like DMA polling into the workqueue. Notice that
+	 * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING).
+	 */
+	WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc));
+
+fsm_start:
+	DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n",
+		ap->id, qc->tf.protocol, ap->hsm_task_state, status);
+
+	switch (ap->hsm_task_state) {
+	case HSM_ST_FIRST:
+		/* Send first data block or PACKET CDB */
+
+		/* If polling, we will stay in the work queue after
+		 * sending the data. Otherwise, interrupt handler
+		 * takes over after sending the data.
+		 */
+		poll_next = (qc->tf.flags & ATA_TFLAG_POLLING);
+
+		/* check device status */
+		if (unlikely((status & ATA_DRQ) == 0)) {
+			/* handle BSY=0, DRQ=0 as error */
+			if (likely(status & (ATA_ERR | ATA_DF)))
+				/* device stops HSM for abort/error */
+				qc->err_mask |= AC_ERR_DEV;
+			else
+				/* HSM violation. Let EH handle this */
+				qc->err_mask |= AC_ERR_HSM;
+
+			ap->hsm_task_state = HSM_ST_ERR;
+			goto fsm_start;
+		}
+
+		/* Device should not ask for data transfer (DRQ=1)
+		 * when it finds something wrong.
+		 * We ignore DRQ here and stop the HSM by
+		 * changing hsm_task_state to HSM_ST_ERR and
+		 * let the EH abort the command or reset the device.
+		 */
+		if (unlikely(status & (ATA_ERR | ATA_DF))) {
+			printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
+			       ap->id, status);
+			qc->err_mask |= AC_ERR_HSM;
+			ap->hsm_task_state = HSM_ST_ERR;
+			goto fsm_start;
+		}
+
+		/* Send the CDB (atapi) or the first data block (ata pio out).
+		 * During the state transition, interrupt handler shouldn't
+		 * be invoked before the data transfer is complete and
+		 * hsm_task_state is changed. Hence, the following locking.
+		 */
+		if (in_wq)
+			spin_lock_irqsave(ap->lock, flags);
+
+		if (qc->tf.protocol == ATA_PROT_PIO) {
+			/* PIO data out protocol.
+			 * send first data block.
+			 */
+
+			/* ata_pio_sectors() might change the state
+			 * to HSM_ST_LAST. so, the state is changed here
+			 * before ata_pio_sectors().
+			 */
+			ap->hsm_task_state = HSM_ST;
+			ata_pio_sectors(qc);
+			ata_altstatus(ap); /* flush */
+		} else
+			/* send CDB */
+			atapi_send_cdb(ap, qc);
+
+		if (in_wq)
+			spin_unlock_irqrestore(ap->lock, flags);
+
+		/* if polling, ata_pio_task() handles the rest.
+		 * otherwise, interrupt handler takes over from here.
+		 */
+		break;
+
+	case HSM_ST:
+		/* complete command or read/write the data register */
+		if (qc->tf.protocol == ATA_PROT_ATAPI) {
+			/* ATAPI PIO protocol */
+			if ((status & ATA_DRQ) == 0) {
+				/* No more data to transfer or device error.
+				 * Device error will be tagged in HSM_ST_LAST.
+				 */
+				ap->hsm_task_state = HSM_ST_LAST;
+				goto fsm_start;
+			}
+
+			/* Device should not ask for data transfer (DRQ=1)
+			 * when it finds something wrong.
+			 * We ignore DRQ here and stop the HSM by
+			 * changing hsm_task_state to HSM_ST_ERR and
+			 * let the EH abort the command or reset the device.
+			 */
+			if (unlikely(status & (ATA_ERR | ATA_DF))) {
+				printk(KERN_WARNING "ata%d: DRQ=1 with device error, dev_stat 0x%X\n",
+				       ap->id, status);
+				qc->err_mask |= AC_ERR_HSM;
+				ap->hsm_task_state = HSM_ST_ERR;
+				goto fsm_start;
+			}
+
+			atapi_pio_bytes(qc);
+
+			if (unlikely(ap->hsm_task_state == HSM_ST_ERR))
+				/* bad ireason reported by device */
+				goto fsm_start;
+
+		} else {
+			/* ATA PIO protocol */
+			if (unlikely((status & ATA_DRQ) == 0)) {
+				/* handle BSY=0, DRQ=0 as error */
+				if (likely(status & (ATA_ERR | ATA_DF)))
+					/* device stops HSM for abort/error */
+					qc->err_mask |= AC_ERR_DEV;
+				else
+					/* HSM violation. Let EH handle this */
+					qc->err_mask |= AC_ERR_HSM;
+
+				ap->hsm_task_state = HSM_ST_ERR;
+				goto fsm_start;
+			}
+
+			/* For PIO reads, some devices may ask for
+			 * data transfer (DRQ=1) alone with ERR=1.
+			 * We respect DRQ here and transfer one
+			 * block of junk data before changing the
+			 * hsm_task_state to HSM_ST_ERR.
+			 *
+			 * For PIO writes, ERR=1 DRQ=1 doesn't make
+			 * sense since the data block has been
+			 * transferred to the device.
+			 */
+			if (unlikely(status & (ATA_ERR | ATA_DF))) {
+				/* data might be corrputed */
+				qc->err_mask |= AC_ERR_DEV;
+
+				if (!(qc->tf.flags & ATA_TFLAG_WRITE)) {
+					ata_pio_sectors(qc);
+					ata_altstatus(ap);
+					status = ata_wait_idle(ap);
+				}
+
+				if (status & (ATA_BUSY | ATA_DRQ))
+					qc->err_mask |= AC_ERR_HSM;
+
+				/* ata_pio_sectors() might change the
+				 * state to HSM_ST_LAST. so, the state
+				 * is changed after ata_pio_sectors().
+				 */
+				ap->hsm_task_state = HSM_ST_ERR;
+				goto fsm_start;
+			}
+
+			ata_pio_sectors(qc);
+
+			if (ap->hsm_task_state == HSM_ST_LAST &&
+			    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
+				/* all data read */
+				ata_altstatus(ap);
+				status = ata_wait_idle(ap);
+				goto fsm_start;
+			}
+		}
+
+		ata_altstatus(ap); /* flush */
+		poll_next = 1;
+		break;
+
+	case HSM_ST_LAST:
+		if (unlikely(!ata_ok(status))) {
+			qc->err_mask |= __ac_err_mask(status);
+			ap->hsm_task_state = HSM_ST_ERR;
+			goto fsm_start;
+		}
+
+		/* no more data to transfer */
+		DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n",
+			ap->id, qc->dev->devno, status);
+
+		WARN_ON(qc->err_mask);
+
+		ap->hsm_task_state = HSM_ST_IDLE;
+
+		/* complete taskfile transaction */
+		ata_hsm_qc_complete(qc, in_wq);
+
+		poll_next = 0;
+		break;
+
+	case HSM_ST_ERR:
+		/* make sure qc->err_mask is available to
+		 * know what's wrong and recover
+		 */
+		WARN_ON(qc->err_mask == 0);
+
+		ap->hsm_task_state = HSM_ST_IDLE;
+
+		/* complete taskfile transaction */
+		ata_hsm_qc_complete(qc, in_wq);
+
+		poll_next = 0;
+		break;
+	default:
+		poll_next = 0;
+		BUG();
+	}
+
+	return poll_next;
+}
+
+static void ata_pio_task(void *_data)
+{
+	struct ata_queued_cmd *qc = _data;
+	struct ata_port *ap = qc->ap;
+	u8 status;
+	int poll_next;
+
+fsm_start:
+	WARN_ON(ap->hsm_task_state == HSM_ST_IDLE);
+
+	/*
+	 * This is purely heuristic.  This is a fast path.
+	 * Sometimes when we enter, BSY will be cleared in
+	 * a chk-status or two.  If not, the drive is probably seeking
+	 * or something.  Snooze for a couple msecs, then
+	 * chk-status again.  If still busy, queue delayed work.
+	 */
+	status = ata_busy_wait(ap, ATA_BUSY, 5);
+	if (status & ATA_BUSY) {
+		msleep(2);
+		status = ata_busy_wait(ap, ATA_BUSY, 10);
+		if (status & ATA_BUSY) {
+			ata_port_queue_task(ap, ata_pio_task, qc, ATA_SHORT_PAUSE);
+			return;
+		}
+	}
+
+	/* move the HSM */
+	poll_next = ata_hsm_move(ap, qc, status, 1);
+
+	/* another command or interrupt handler
+	 * may be running at this point.
+	 */
+	if (poll_next)
+		goto fsm_start;
+}
+
+/**
+ *	ata_qc_new - Request an available ATA command, for queueing
+ *	@ap: Port associated with device @dev
+ *	@dev: Device from whom we request an available command structure
+ *
+ *	LOCKING:
+ *	None.
+ */
+
+static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
+{
+	struct ata_queued_cmd *qc = NULL;
+	unsigned int i;
+
+	/* no command while frozen */
+	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
+		return NULL;
+
+	/* the last tag is reserved for internal command. */
+	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
+		if (!test_and_set_bit(i, &ap->qc_allocated)) {
+			qc = __ata_qc_from_tag(ap, i);
+			break;
+		}
+
+	if (qc)
+		qc->tag = i;
+
+	return qc;
+}
+
+/**
+ *	ata_qc_new_init - Request an available ATA command, and initialize it
+ *	@dev: Device from whom we request an available command structure
+ *
+ *	LOCKING:
+ *	None.
+ */
+
+struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
+{
+	struct ata_port *ap = dev->ap;
+	struct ata_queued_cmd *qc;
+
+	qc = ata_qc_new(ap);
+	if (qc) {
+		qc->scsicmd = NULL;
+		qc->ap = ap;
+		qc->dev = dev;
+
+		ata_qc_reinit(qc);
+	}
+
+	return qc;
+}
+
+/**
+ *	ata_qc_free - free unused ata_queued_cmd
+ *	@qc: Command to complete
+ *
+ *	Designed to free unused ata_queued_cmd object
+ *	in case something prevents using it.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+void ata_qc_free(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	unsigned int tag;
+
+	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
+
+	qc->flags = 0;
+	tag = qc->tag;
+	if (likely(ata_tag_valid(tag))) {
+		qc->tag = ATA_TAG_POISON;
+		clear_bit(tag, &ap->qc_allocated);
+	}
+}
+
+void __ata_qc_complete(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+
+	WARN_ON(qc == NULL);	/* ata_qc_from_tag _might_ return NULL */
+	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
+
+	if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
+		ata_sg_clean(qc);
+
+	/* command should be marked inactive atomically with qc completion */
+	if (qc->tf.protocol == ATA_PROT_NCQ)
+		ap->sactive &= ~(1 << qc->tag);
+	else
+		ap->active_tag = ATA_TAG_POISON;
+
+	/* atapi: mark qc as inactive to prevent the interrupt handler
+	 * from completing the command twice later, before the error handler
+	 * is called. (when rc != 0 and atapi request sense is needed)
+	 */
+	qc->flags &= ~ATA_QCFLAG_ACTIVE;
+	ap->qc_active &= ~(1 << qc->tag);
+
+	/* call completion callback */
+	qc->complete_fn(qc);
+}
+
+/**
+ *	ata_qc_complete - Complete an active ATA command
+ *	@qc: Command to complete
+ *	@err_mask: ATA Status register contents
+ *
+ *	Indicate to the mid and upper layers that an ATA
+ *	command has completed, with either an ok or not-ok status.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+void ata_qc_complete(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+
+	/* XXX: New EH and old EH use different mechanisms to
+	 * synchronize EH with regular execution path.
+	 *
+	 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
+	 * Normal execution path is responsible for not accessing a
+	 * failed qc.  libata core enforces the rule by returning NULL
+	 * from ata_qc_from_tag() for failed qcs.
+	 *
+	 * Old EH depends on ata_qc_complete() nullifying completion
+	 * requests if ATA_QCFLAG_EH_SCHEDULED is set.  Old EH does
+	 * not synchronize with interrupt handler.  Only PIO task is
+	 * taken care of.
+	 */
+	if (ap->ops->error_handler) {
+		WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
+
+		if (unlikely(qc->err_mask))
+			qc->flags |= ATA_QCFLAG_FAILED;
+
+		if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
+			if (!ata_tag_internal(qc->tag)) {
+				/* always fill result TF for failed qc */
+				ap->ops->tf_read(ap, &qc->result_tf);
+				ata_qc_schedule_eh(qc);
+				return;
+			}
+		}
+
+		/* read result TF if requested */
+		if (qc->flags & ATA_QCFLAG_RESULT_TF)
+			ap->ops->tf_read(ap, &qc->result_tf);
+
+		__ata_qc_complete(qc);
+	} else {
+		if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
+			return;
+
+		/* read result TF if failed or requested */
+		if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
+			ap->ops->tf_read(ap, &qc->result_tf);
+
+		__ata_qc_complete(qc);
+	}
+}
+
+/**
+ *	ata_qc_complete_multiple - Complete multiple qcs successfully
+ *	@ap: port in question
+ *	@qc_active: new qc_active mask
+ *	@finish_qc: LLDD callback invoked before completing a qc
+ *
+ *	Complete in-flight commands.  This functions is meant to be
+ *	called from low-level driver's interrupt routine to complete
+ *	requests normally.  ap->qc_active and @qc_active is compared
+ *	and commands are completed accordingly.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	Number of completed commands on success, -errno otherwise.
+ */
+int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
+			     void (*finish_qc)(struct ata_queued_cmd *))
+{
+	int nr_done = 0;
+	u32 done_mask;
+	int i;
+
+	done_mask = ap->qc_active ^ qc_active;
+
+	if (unlikely(done_mask & qc_active)) {
+		ata_port_printk(ap, KERN_ERR, "illegal qc_active transition "
+				"(%08x->%08x)\n", ap->qc_active, qc_active);
+		return -EINVAL;
+	}
+
+	for (i = 0; i < ATA_MAX_QUEUE; i++) {
+		struct ata_queued_cmd *qc;
+
+		if (!(done_mask & (1 << i)))
+			continue;
+
+		if ((qc = ata_qc_from_tag(ap, i))) {
+			if (finish_qc)
+				finish_qc(qc);
+			ata_qc_complete(qc);
+			nr_done++;
+		}
+	}
+
+	return nr_done;
+}
+
+static inline int ata_should_dma_map(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+
+	switch (qc->tf.protocol) {
+	case ATA_PROT_NCQ:
+	case ATA_PROT_DMA:
+	case ATA_PROT_ATAPI_DMA:
+		return 1;
+
+	case ATA_PROT_ATAPI:
+	case ATA_PROT_PIO:
+		if (ap->flags & ATA_FLAG_PIO_DMA)
+			return 1;
+
+		/* fall through */
+
+	default:
+		return 0;
+	}
+
+	/* never reached */
+}
+
+/**
+ *	ata_qc_issue - issue taskfile to device
+ *	@qc: command to issue to device
+ *
+ *	Prepare an ATA command to submission to device.
+ *	This includes mapping the data into a DMA-able
+ *	area, filling in the S/G table, and finally
+ *	writing the taskfile to hardware, starting the command.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+void ata_qc_issue(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+
+	/* Make sure only one non-NCQ command is outstanding.  The
+	 * check is skipped for old EH because it reuses active qc to
+	 * request ATAPI sense.
+	 */
+	WARN_ON(ap->ops->error_handler && ata_tag_valid(ap->active_tag));
+
+	if (qc->tf.protocol == ATA_PROT_NCQ) {
+		WARN_ON(ap->sactive & (1 << qc->tag));
+		ap->sactive |= 1 << qc->tag;
+	} else {
+		WARN_ON(ap->sactive);
+		ap->active_tag = qc->tag;
+	}
+
+	qc->flags |= ATA_QCFLAG_ACTIVE;
+	ap->qc_active |= 1 << qc->tag;
+
+	if (ata_should_dma_map(qc)) {
+		if (qc->flags & ATA_QCFLAG_SG) {
+			if (ata_sg_setup(qc))
+				goto sg_err;
+		} else if (qc->flags & ATA_QCFLAG_SINGLE) {
+			if (ata_sg_setup_one(qc))
+				goto sg_err;
+		}
+	} else {
+		qc->flags &= ~ATA_QCFLAG_DMAMAP;
+	}
+
+	ap->ops->qc_prep(qc);
+
+	qc->err_mask |= ap->ops->qc_issue(qc);
+	if (unlikely(qc->err_mask))
+		goto err;
+	return;
+
+sg_err:
+	qc->flags &= ~ATA_QCFLAG_DMAMAP;
+	qc->err_mask |= AC_ERR_SYSTEM;
+err:
+	ata_qc_complete(qc);
+}
+
+/**
+ *	ata_qc_issue_prot - issue taskfile to device in proto-dependent manner
+ *	@qc: command to issue to device
+ *
+ *	Using various libata functions and hooks, this function
+ *	starts an ATA command.  ATA commands are grouped into
+ *	classes called "protocols", and issuing each type of protocol
+ *	is slightly different.
+ *
+ *	May be used as the qc_issue() entry in ata_port_operations.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	Zero on success, AC_ERR_* mask on failure
+ */
+
+unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+
+	/* Use polling pio if the LLD doesn't handle
+	 * interrupt driven pio and atapi CDB interrupt.
+	 */
+	if (ap->flags & ATA_FLAG_PIO_POLLING) {
+		switch (qc->tf.protocol) {
+		case ATA_PROT_PIO:
+		case ATA_PROT_ATAPI:
+		case ATA_PROT_ATAPI_NODATA:
+			qc->tf.flags |= ATA_TFLAG_POLLING;
+			break;
+		case ATA_PROT_ATAPI_DMA:
+			if (qc->dev->flags & ATA_DFLAG_CDB_INTR)
+				/* see ata_dma_blacklisted() */
+				BUG();
+			break;
+		default:
+			break;
+		}
+	}
+
+	/* select the device */
+	ata_dev_select(ap, qc->dev->devno, 1, 0);
+
+	/* start the command */
+	switch (qc->tf.protocol) {
+	case ATA_PROT_NODATA:
+		if (qc->tf.flags & ATA_TFLAG_POLLING)
+			ata_qc_set_polling(qc);
+
+		ata_tf_to_host(ap, &qc->tf);
+		ap->hsm_task_state = HSM_ST_LAST;
+
+		if (qc->tf.flags & ATA_TFLAG_POLLING)
+			ata_port_queue_task(ap, ata_pio_task, qc, 0);
+
+		break;
+
+	case ATA_PROT_DMA:
+		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
+
+		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
+		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
+		ap->ops->bmdma_start(qc);	    /* initiate bmdma */
+		ap->hsm_task_state = HSM_ST_LAST;
+		break;
+
+	case ATA_PROT_PIO:
+		if (qc->tf.flags & ATA_TFLAG_POLLING)
+			ata_qc_set_polling(qc);
+
+		ata_tf_to_host(ap, &qc->tf);
+
+		if (qc->tf.flags & ATA_TFLAG_WRITE) {
+			/* PIO data out protocol */
+			ap->hsm_task_state = HSM_ST_FIRST;
+			ata_port_queue_task(ap, ata_pio_task, qc, 0);
+
+			/* always send first data block using
+			 * the ata_pio_task() codepath.
+			 */
+		} else {
+			/* PIO data in protocol */
+			ap->hsm_task_state = HSM_ST;
+
+			if (qc->tf.flags & ATA_TFLAG_POLLING)
+				ata_port_queue_task(ap, ata_pio_task, qc, 0);
+
+			/* if polling, ata_pio_task() handles the rest.
+			 * otherwise, interrupt handler takes over from here.
+			 */
+		}
+
+		break;
+
+	case ATA_PROT_ATAPI:
+	case ATA_PROT_ATAPI_NODATA:
+		if (qc->tf.flags & ATA_TFLAG_POLLING)
+			ata_qc_set_polling(qc);
+
+		ata_tf_to_host(ap, &qc->tf);
+
+		ap->hsm_task_state = HSM_ST_FIRST;
+
+		/* send cdb by polling if no cdb interrupt */
+		if ((!(qc->dev->flags & ATA_DFLAG_CDB_INTR)) ||
+		    (qc->tf.flags & ATA_TFLAG_POLLING))
+			ata_port_queue_task(ap, ata_pio_task, qc, 0);
+		break;
+
+	case ATA_PROT_ATAPI_DMA:
+		WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING);
+
+		ap->ops->tf_load(ap, &qc->tf);	 /* load tf registers */
+		ap->ops->bmdma_setup(qc);	    /* set up bmdma */
+		ap->hsm_task_state = HSM_ST_FIRST;
+
+		/* send cdb by polling if no cdb interrupt */
+		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
+			ata_port_queue_task(ap, ata_pio_task, qc, 0);
+		break;
+
+	default:
+		WARN_ON(1);
+		return AC_ERR_SYSTEM;
+	}
+
+	return 0;
+}
+
+/**
+ *	ata_host_intr - Handle host interrupt for given (port, task)
+ *	@ap: Port on which interrupt arrived (possibly...)
+ *	@qc: Taskfile currently active in engine
+ *
+ *	Handle host interrupt for given queued command.  Currently,
+ *	only DMA interrupts are handled.  All other commands are
+ *	handled via polling with interrupts disabled (nIEN bit).
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	One if interrupt was handled, zero if not (shared irq).
+ */
+
+inline unsigned int ata_host_intr (struct ata_port *ap,
+				   struct ata_queued_cmd *qc)
+{
+	u8 status, host_stat = 0;
+
+	VPRINTK("ata%u: protocol %d task_state %d\n",
+		ap->id, qc->tf.protocol, ap->hsm_task_state);
+
+	/* Check whether we are expecting interrupt in this state */
+	switch (ap->hsm_task_state) {
+	case HSM_ST_FIRST:
+		/* Some pre-ATAPI-4 devices assert INTRQ
+		 * at this state when ready to receive CDB.
+		 */
+
+		/* Check the ATA_DFLAG_CDB_INTR flag is enough here.
+		 * The flag was turned on only for atapi devices.
+		 * No need to check is_atapi_taskfile(&qc->tf) again.
+		 */
+		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
+			goto idle_irq;
+		break;
+	case HSM_ST_LAST:
+		if (qc->tf.protocol == ATA_PROT_DMA ||
+		    qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
+			/* check status of DMA engine */
+			host_stat = ap->ops->bmdma_status(ap);
+			VPRINTK("ata%u: host_stat 0x%X\n", ap->id, host_stat);
+
+			/* if it's not our irq... */
+			if (!(host_stat & ATA_DMA_INTR))
+				goto idle_irq;
+
+			/* before we do anything else, clear DMA-Start bit */
+			ap->ops->bmdma_stop(qc);
+
+			if (unlikely(host_stat & ATA_DMA_ERR)) {
+				/* error when transfering data to/from memory */
+				qc->err_mask |= AC_ERR_HOST_BUS;
+				ap->hsm_task_state = HSM_ST_ERR;
+			}
+		}
+		break;
+	case HSM_ST:
+		break;
+	default:
+		goto idle_irq;
+	}
+
+	/* check altstatus */
+	status = ata_altstatus(ap);
+	if (status & ATA_BUSY)
+		goto idle_irq;
+
+	/* check main status, clearing INTRQ */
+	status = ata_chk_status(ap);
+	if (unlikely(status & ATA_BUSY))
+		goto idle_irq;
+
+	/* ack bmdma irq events */
+	ap->ops->irq_clear(ap);
+
+	ata_hsm_move(ap, qc, status, 0);
+	return 1;	/* irq handled */
+
+idle_irq:
+	ap->stats.idle_irq++;
+
+#ifdef ATA_IRQ_TRAP
+	if ((ap->stats.idle_irq % 1000) == 0) {
+		ata_irq_ack(ap, 0); /* debug trap */
+		ata_port_printk(ap, KERN_WARNING, "irq trap\n");
+		return 1;
+	}
+#endif
+	return 0;	/* irq not handled */
+}
+
+/**
+ *	ata_interrupt - Default ATA host interrupt handler
+ *	@irq: irq line (unused)
+ *	@dev_instance: pointer to our ata_host_set information structure
+ *	@regs: unused
+ *
+ *	Default interrupt handler for PCI IDE devices.  Calls
+ *	ata_host_intr() for each port that is not disabled.
+ *
+ *	LOCKING:
+ *	Obtains host_set lock during operation.
+ *
+ *	RETURNS:
+ *	IRQ_NONE or IRQ_HANDLED.
+ */
+
+irqreturn_t ata_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
+{
+	struct ata_host_set *host_set = dev_instance;
+	unsigned int i;
+	unsigned int handled = 0;
+	unsigned long flags;
+
+	/* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
+	spin_lock_irqsave(&host_set->lock, flags);
+
+	for (i = 0; i < host_set->n_ports; i++) {
+		struct ata_port *ap;
+
+		ap = host_set->ports[i];
+		if (ap &&
+		    !(ap->flags & ATA_FLAG_DISABLED)) {
+			struct ata_queued_cmd *qc;
+
+			qc = ata_qc_from_tag(ap, ap->active_tag);
+			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
+			    (qc->flags & ATA_QCFLAG_ACTIVE))
+				handled |= ata_host_intr(ap, qc);
+		}
+	}
+
+	spin_unlock_irqrestore(&host_set->lock, flags);
+
+	return IRQ_RETVAL(handled);
+}
+
+/**
+ *	sata_scr_valid - test whether SCRs are accessible
+ *	@ap: ATA port to test SCR accessibility for
+ *
+ *	Test whether SCRs are accessible for @ap.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	1 if SCRs are accessible, 0 otherwise.
+ */
+int sata_scr_valid(struct ata_port *ap)
+{
+	return ap->cbl == ATA_CBL_SATA && ap->ops->scr_read;
+}
+
+/**
+ *	sata_scr_read - read SCR register of the specified port
+ *	@ap: ATA port to read SCR for
+ *	@reg: SCR to read
+ *	@val: Place to store read value
+ *
+ *	Read SCR register @reg of @ap into *@val.  This function is
+ *	guaranteed to succeed if the cable type of the port is SATA
+ *	and the port implements ->scr_read.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	0 on success, negative errno on failure.
+ */
+int sata_scr_read(struct ata_port *ap, int reg, u32 *val)
+{
+	if (sata_scr_valid(ap)) {
+		*val = ap->ops->scr_read(ap, reg);
+		return 0;
+	}
+	return -EOPNOTSUPP;
+}
+
+/**
+ *	sata_scr_write - write SCR register of the specified port
+ *	@ap: ATA port to write SCR for
+ *	@reg: SCR to write
+ *	@val: value to write
+ *
+ *	Write @val to SCR register @reg of @ap.  This function is
+ *	guaranteed to succeed if the cable type of the port is SATA
+ *	and the port implements ->scr_read.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	0 on success, negative errno on failure.
+ */
+int sata_scr_write(struct ata_port *ap, int reg, u32 val)
+{
+	if (sata_scr_valid(ap)) {
+		ap->ops->scr_write(ap, reg, val);
+		return 0;
+	}
+	return -EOPNOTSUPP;
+}
+
+/**
+ *	sata_scr_write_flush - write SCR register of the specified port and flush
+ *	@ap: ATA port to write SCR for
+ *	@reg: SCR to write
+ *	@val: value to write
+ *
+ *	This function is identical to sata_scr_write() except that this
+ *	function performs flush after writing to the register.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	0 on success, negative errno on failure.
+ */
+int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val)
+{
+	if (sata_scr_valid(ap)) {
+		ap->ops->scr_write(ap, reg, val);
+		ap->ops->scr_read(ap, reg);
+		return 0;
+	}
+	return -EOPNOTSUPP;
+}
+
+/**
+ *	ata_port_online - test whether the given port is online
+ *	@ap: ATA port to test
+ *
+ *	Test whether @ap is online.  Note that this function returns 0
+ *	if online status of @ap cannot be obtained, so
+ *	ata_port_online(ap) != !ata_port_offline(ap).
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	1 if the port online status is available and online.
+ */
+int ata_port_online(struct ata_port *ap)
+{
+	u32 sstatus;
+
+	if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) == 0x3)
+		return 1;
+	return 0;
+}
+
+/**
+ *	ata_port_offline - test whether the given port is offline
+ *	@ap: ATA port to test
+ *
+ *	Test whether @ap is offline.  Note that this function returns
+ *	0 if offline status of @ap cannot be obtained, so
+ *	ata_port_online(ap) != !ata_port_offline(ap).
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	1 if the port offline status is available and offline.
+ */
+int ata_port_offline(struct ata_port *ap)
+{
+	u32 sstatus;
+
+	if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) != 0x3)
+		return 1;
+	return 0;
+}
+
+int ata_flush_cache(struct ata_device *dev)
+{
+	unsigned int err_mask;
+	u8 cmd;
+
+	if (!ata_try_flush_cache(dev))
+		return 0;
+
+	if (ata_id_has_flush_ext(dev->id))
+		cmd = ATA_CMD_FLUSH_EXT;
+	else
+		cmd = ATA_CMD_FLUSH;
+
+	err_mask = ata_do_simple_cmd(dev, cmd);
+	if (err_mask) {
+		ata_dev_printk(dev, KERN_ERR, "failed to flush cache\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int ata_host_set_request_pm(struct ata_host_set *host_set,
+				   pm_message_t mesg, unsigned int action,
+				   unsigned int ehi_flags, int wait)
+{
+	unsigned long flags;
+	int i, rc;
+
+	for (i = 0; i < host_set->n_ports; i++) {
+		struct ata_port *ap = host_set->ports[i];
+
+		/* Previous resume operation might still be in
+		 * progress.  Wait for PM_PENDING to clear.
+		 */
+		if (ap->pflags & ATA_PFLAG_PM_PENDING) {
+			ata_port_wait_eh(ap);
+			WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
+		}
+
+		/* request PM ops to EH */
+		spin_lock_irqsave(ap->lock, flags);
+
+		ap->pm_mesg = mesg;
+		if (wait) {
+			rc = 0;
+			ap->pm_result = &rc;
+		}
+
+		ap->pflags |= ATA_PFLAG_PM_PENDING;
+		ap->eh_info.action |= action;
+		ap->eh_info.flags |= ehi_flags;
+
+		ata_port_schedule_eh(ap);
+
+		spin_unlock_irqrestore(ap->lock, flags);
+
+		/* wait and check result */
+		if (wait) {
+			ata_port_wait_eh(ap);
+			WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
+			if (rc)
+				return rc;
+		}
+	}
+
+	return 0;
+}
+
+/**
+ *	ata_host_set_suspend - suspend host_set
+ *	@host_set: host_set to suspend
+ *	@mesg: PM message
+ *
+ *	Suspend @host_set.  Actual operation is performed by EH.  This
+ *	function requests EH to perform PM operations and waits for EH
+ *	to finish.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, -errno on failure.
+ */
+int ata_host_set_suspend(struct ata_host_set *host_set, pm_message_t mesg)
+{
+	int i, j, rc;
+
+	rc = ata_host_set_request_pm(host_set, mesg, 0, ATA_EHI_QUIET, 1);
+	if (rc)
+		goto fail;
+
+	/* EH is quiescent now.  Fail if we have any ready device.
+	 * This happens if hotplug occurs between completion of device
+	 * suspension and here.
+	 */
+	for (i = 0; i < host_set->n_ports; i++) {
+		struct ata_port *ap = host_set->ports[i];
+
+		for (j = 0; j < ATA_MAX_DEVICES; j++) {
+			struct ata_device *dev = &ap->device[j];
+
+			if (ata_dev_ready(dev)) {
+				ata_port_printk(ap, KERN_WARNING,
+						"suspend failed, device %d "
+						"still active\n", dev->devno);
+				rc = -EBUSY;
+				goto fail;
+			}
+		}
+	}
+
+	host_set->dev->power.power_state = mesg;
+	return 0;
+
+ fail:
+	ata_host_set_resume(host_set);
+	return rc;
+}
+
+/**
+ *	ata_host_set_resume - resume host_set
+ *	@host_set: host_set to resume
+ *
+ *	Resume @host_set.  Actual operation is performed by EH.  This
+ *	function requests EH to perform PM operations and returns.
+ *	Note that all resume operations are performed parallely.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+void ata_host_set_resume(struct ata_host_set *host_set)
+{
+	ata_host_set_request_pm(host_set, PMSG_ON, ATA_EH_SOFTRESET,
+				ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
+	host_set->dev->power.power_state = PMSG_ON;
+}
+
+/**
+ *	ata_port_start - Set port up for dma.
+ *	@ap: Port to initialize
+ *
+ *	Called just after data structures for each port are
+ *	initialized.  Allocates space for PRD table.
+ *
+ *	May be used as the port_start() entry in ata_port_operations.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+
+int ata_port_start (struct ata_port *ap)
+{
+	struct device *dev = ap->dev;
+	int rc;
+
+	ap->prd = dma_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL);
+	if (!ap->prd)
+		return -ENOMEM;
+
+	rc = ata_pad_alloc(ap, dev);
+	if (rc) {
+		dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
+		return rc;
+	}
+
+	DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
+
+	return 0;
+}
+
+
+/**
+ *	ata_port_stop - Undo ata_port_start()
+ *	@ap: Port to shut down
+ *
+ *	Frees the PRD table.
+ *
+ *	May be used as the port_stop() entry in ata_port_operations.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+
+void ata_port_stop (struct ata_port *ap)
+{
+	struct device *dev = ap->dev;
+
+	dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
+	ata_pad_free(ap, dev);
+}
+
+void ata_host_stop (struct ata_host_set *host_set)
+{
+	if (host_set->mmio_base)
+		iounmap(host_set->mmio_base);
+}
+
+/**
+ *	ata_dev_init - Initialize an ata_device structure
+ *	@dev: Device structure to initialize
+ *
+ *	Initialize @dev in preparation for probing.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+void ata_dev_init(struct ata_device *dev)
+{
+	struct ata_port *ap = dev->ap;
+	unsigned long flags;
+
+	/* SATA spd limit is bound to the first device */
+	ap->sata_spd_limit = ap->hw_sata_spd_limit;
+
+	/* High bits of dev->flags are used to record warm plug
+	 * requests which occur asynchronously.  Synchronize using
+	 * host_set lock.
+	 */
+	spin_lock_irqsave(ap->lock, flags);
+	dev->flags &= ~ATA_DFLAG_INIT_MASK;
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
+	       sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
+	dev->pio_mask = UINT_MAX;
+	dev->mwdma_mask = UINT_MAX;
+	dev->udma_mask = UINT_MAX;
+}
+
+/**
+ *	ata_port_init - Initialize an ata_port structure
+ *	@ap: Structure to initialize
+ *	@host_set: Collection of hosts to which @ap belongs
+ *	@ent: Probe information provided by low-level driver
+ *	@port_no: Port number associated with this ata_port
+ *
+ *	Initialize a new ata_port structure.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+void ata_port_init(struct ata_port *ap, struct ata_host_set *host_set,
+		   const struct ata_probe_ent *ent, unsigned int port_no)
+{
+	unsigned int i;
+
+	ap->lock = &host_set->lock;
+	ap->flags = ATA_FLAG_DISABLED;
+	ap->id = ata_unique_id++;
+	ap->ctl = ATA_DEVCTL_OBS;
+	ap->host_set = host_set;
+	ap->dev = ent->dev;
+	ap->port_no = port_no;
+	ap->pio_mask = ent->pio_mask;
+	ap->mwdma_mask = ent->mwdma_mask;
+	ap->udma_mask = ent->udma_mask;
+	ap->flags |= ent->host_flags;
+	ap->ops = ent->port_ops;
+	ap->hw_sata_spd_limit = UINT_MAX;
+	ap->active_tag = ATA_TAG_POISON;
+	ap->last_ctl = 0xFF;
+
+#if defined(ATA_VERBOSE_DEBUG)
+	/* turn on all debugging levels */
+	ap->msg_enable = 0x00FF;
+#elif defined(ATA_DEBUG)
+	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_INFO | ATA_MSG_CTL | ATA_MSG_WARN | ATA_MSG_ERR;
+#else
+	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
+#endif
+
+	INIT_WORK(&ap->port_task, NULL, NULL);
+	INIT_WORK(&ap->hotplug_task, ata_scsi_hotplug, ap);
+	INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan, ap);
+	INIT_LIST_HEAD(&ap->eh_done_q);
+	init_waitqueue_head(&ap->eh_wait_q);
+
+	/* set cable type */
+	ap->cbl = ATA_CBL_NONE;
+	if (ap->flags & ATA_FLAG_SATA)
+		ap->cbl = ATA_CBL_SATA;
+
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		struct ata_device *dev = &ap->device[i];
+		dev->ap = ap;
+		dev->devno = i;
+		ata_dev_init(dev);
+	}
+
+#ifdef ATA_IRQ_TRAP
+	ap->stats.unhandled_irq = 1;
+	ap->stats.idle_irq = 1;
+#endif
+
+	memcpy(&ap->ioaddr, &ent->port[port_no], sizeof(struct ata_ioports));
+}
+
+/**
+ *	ata_port_init_shost - Initialize SCSI host associated with ATA port
+ *	@ap: ATA port to initialize SCSI host for
+ *	@shost: SCSI host associated with @ap
+ *
+ *	Initialize SCSI host @shost associated with ATA port @ap.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+static void ata_port_init_shost(struct ata_port *ap, struct Scsi_Host *shost)
+{
+	ap->host = shost;
+
+	shost->unique_id = ap->id;
+	shost->max_id = 16;
+	shost->max_lun = 1;
+	shost->max_channel = 1;
+	shost->max_cmd_len = 12;
+}
+
+/**
+ *	ata_port_add - Attach low-level ATA driver to system
+ *	@ent: Information provided by low-level driver
+ *	@host_set: Collections of ports to which we add
+ *	@port_no: Port number associated with this host
+ *
+ *	Attach low-level ATA driver to system.
+ *
+ *	LOCKING:
+ *	PCI/etc. bus probe sem.
+ *
+ *	RETURNS:
+ *	New ata_port on success, for NULL on error.
+ */
+static struct ata_port * ata_port_add(const struct ata_probe_ent *ent,
+				      struct ata_host_set *host_set,
+				      unsigned int port_no)
+{
+	struct Scsi_Host *shost;
+	struct ata_port *ap;
+
+	DPRINTK("ENTER\n");
+
+	if (!ent->port_ops->error_handler &&
+	    !(ent->host_flags & (ATA_FLAG_SATA_RESET | ATA_FLAG_SRST))) {
+		printk(KERN_ERR "ata%u: no reset mechanism available\n",
+		       port_no);
+		return NULL;
+	}
+
+	shost = scsi_host_alloc(ent->sht, sizeof(struct ata_port));
+	if (!shost)
+		return NULL;
+
+	shost->transportt = &ata_scsi_transport_template;
+
+	ap = ata_shost_to_port(shost);
+
+	ata_port_init(ap, host_set, ent, port_no);
+	ata_port_init_shost(ap, shost);
+
+	return ap;
+}
+
+/**
+ *	ata_sas_host_init - Initialize a host_set struct
+ *	@host_set:	host_set to initialize
+ *	@dev:		device host_set is attached to
+ *	@flags:	host_set flags
+ *	@ops:		port_ops
+ *
+ *	LOCKING:
+ *	PCI/etc. bus probe sem.
+ *
+ */
+
+void ata_host_set_init(struct ata_host_set *host_set,
+		       struct device *dev, unsigned long flags,
+		       const struct ata_port_operations *ops)
+{
+	spin_lock_init(&host_set->lock);
+	host_set->dev = dev;
+	host_set->flags = flags;
+	host_set->ops = ops;
+}
+
+/**
+ *	ata_device_add - Register hardware device with ATA and SCSI layers
+ *	@ent: Probe information describing hardware device to be registered
+ *
+ *	This function processes the information provided in the probe
+ *	information struct @ent, allocates the necessary ATA and SCSI
+ *	host information structures, initializes them, and registers
+ *	everything with requisite kernel subsystems.
+ *
+ *	This function requests irqs, probes the ATA bus, and probes
+ *	the SCSI bus.
+ *
+ *	LOCKING:
+ *	PCI/etc. bus probe sem.
+ *
+ *	RETURNS:
+ *	Number of ports registered.  Zero on error (no ports registered).
+ */
+int ata_device_add(const struct ata_probe_ent *ent)
+{
+	unsigned int i;
+	struct device *dev = ent->dev;
+	struct ata_host_set *host_set;
+	int rc;
+
+	DPRINTK("ENTER\n");
+	/* alloc a container for our list of ATA ports (buses) */
+	host_set = kzalloc(sizeof(struct ata_host_set) +
+			   (ent->n_ports * sizeof(void *)), GFP_KERNEL);
+	if (!host_set)
+		return 0;
+
+	ata_host_set_init(host_set, dev, ent->host_set_flags, ent->port_ops);
+	host_set->n_ports = ent->n_ports;
+	host_set->irq = ent->irq;
+	host_set->irq2 = ent->irq2;
+	host_set->mmio_base = ent->mmio_base;
+	host_set->private_data = ent->private_data;
+
+	/* register each port bound to this device */
+	for (i = 0; i < host_set->n_ports; i++) {
+		struct ata_port *ap;
+		unsigned long xfer_mode_mask;
+		int irq_line = ent->irq;
+
+		ap = ata_port_add(ent, host_set, i);
+		if (!ap)
+			goto err_out;
+
+		host_set->ports[i] = ap;
+
+		/* dummy? */
+		if (ent->dummy_port_mask & (1 << i)) {
+			ata_port_printk(ap, KERN_INFO, "DUMMY\n");
+			ap->ops = &ata_dummy_port_ops;
+			continue;
+		}
+
+		/* start port */
+		rc = ap->ops->port_start(ap);
+		if (rc) {
+			host_set->ports[i] = NULL;
+			scsi_host_put(ap->host);
+			goto err_out;
+		}
+
+		/* Report the secondary IRQ for second channel legacy */
+		if (i == 1 && ent->irq2)
+			irq_line = ent->irq2;
+
+		xfer_mode_mask =(ap->udma_mask << ATA_SHIFT_UDMA) |
+				(ap->mwdma_mask << ATA_SHIFT_MWDMA) |
+				(ap->pio_mask << ATA_SHIFT_PIO);
+
+		/* print per-port info to dmesg */
+		ata_port_printk(ap, KERN_INFO, "%cATA max %s cmd 0x%lX "
+				"ctl 0x%lX bmdma 0x%lX irq %d\n",
+				ap->flags & ATA_FLAG_SATA ? 'S' : 'P',
+				ata_mode_string(xfer_mode_mask),
+				ap->ioaddr.cmd_addr,
+				ap->ioaddr.ctl_addr,
+				ap->ioaddr.bmdma_addr,
+				irq_line);
+
+		ata_chk_status(ap);
+		host_set->ops->irq_clear(ap);
+		ata_eh_freeze_port(ap);	/* freeze port before requesting IRQ */
+	}
+
+	/* obtain irq, that may be shared between channels */
+	rc = request_irq(ent->irq, ent->port_ops->irq_handler, ent->irq_flags,
+			 DRV_NAME, host_set);
+	if (rc) {
+		dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
+			   ent->irq, rc);
+		goto err_out;
+	}
+
+	/* do we have a second IRQ for the other channel, eg legacy mode */
+	if (ent->irq2) {
+		/* We will get weird core code crashes later if this is true
+		   so trap it now */
+		BUG_ON(ent->irq == ent->irq2);
+
+		rc = request_irq(ent->irq2, ent->port_ops->irq_handler, ent->irq_flags,
+			 DRV_NAME, host_set);
+		if (rc) {
+			dev_printk(KERN_ERR, dev, "irq %lu request failed: %d\n",
+				   ent->irq2, rc);
+			goto err_out_free_irq;
+		}
+	}
+
+	/* perform each probe synchronously */
+	DPRINTK("probe begin\n");
+	for (i = 0; i < host_set->n_ports; i++) {
+		struct ata_port *ap = host_set->ports[i];
+		u32 scontrol;
+		int rc;
+
+		/* init sata_spd_limit to the current value */
+		if (sata_scr_read(ap, SCR_CONTROL, &scontrol) == 0) {
+			int spd = (scontrol >> 4) & 0xf;
+			ap->hw_sata_spd_limit &= (1 << spd) - 1;
+		}
+		ap->sata_spd_limit = ap->hw_sata_spd_limit;
+
+		rc = scsi_add_host(ap->host, dev);
+		if (rc) {
+			ata_port_printk(ap, KERN_ERR, "scsi_add_host failed\n");
+			/* FIXME: do something useful here */
+			/* FIXME: handle unconditional calls to
+			 * scsi_scan_host and ata_host_remove, below,
+			 * at the very least
+			 */
+		}
+
+		if (ap->ops->error_handler) {
+			struct ata_eh_info *ehi = &ap->eh_info;
+			unsigned long flags;
+
+			ata_port_probe(ap);
+
+			/* kick EH for boot probing */
+			spin_lock_irqsave(ap->lock, flags);
+
+			ehi->probe_mask = (1 << ATA_MAX_DEVICES) - 1;
+			ehi->action |= ATA_EH_SOFTRESET;
+			ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
+
+			ap->pflags |= ATA_PFLAG_LOADING;
+			ata_port_schedule_eh(ap);
+
+			spin_unlock_irqrestore(ap->lock, flags);
+
+			/* wait for EH to finish */
+			ata_port_wait_eh(ap);
+		} else {
+			DPRINTK("ata%u: bus probe begin\n", ap->id);
+			rc = ata_bus_probe(ap);
+			DPRINTK("ata%u: bus probe end\n", ap->id);
+
+			if (rc) {
+				/* FIXME: do something useful here?
+				 * Current libata behavior will
+				 * tear down everything when
+				 * the module is removed
+				 * or the h/w is unplugged.
+				 */
+			}
+		}
+	}
+
+	/* probes are done, now scan each port's disk(s) */
+	DPRINTK("host probe begin\n");
+	for (i = 0; i < host_set->n_ports; i++) {
+		struct ata_port *ap = host_set->ports[i];
+
+		ata_scsi_scan_host(ap);
+	}
+
+	dev_set_drvdata(dev, host_set);
+
+	VPRINTK("EXIT, returning %u\n", ent->n_ports);
+	return ent->n_ports; /* success */
+
+err_out_free_irq:
+	free_irq(ent->irq, host_set);
+err_out:
+	for (i = 0; i < host_set->n_ports; i++) {
+		struct ata_port *ap = host_set->ports[i];
+		if (ap) {
+			ap->ops->port_stop(ap);
+			scsi_host_put(ap->host);
+		}
+	}
+
+	kfree(host_set);
+	VPRINTK("EXIT, returning 0\n");
+	return 0;
+}
+
+/**
+ *	ata_port_detach - Detach ATA port in prepration of device removal
+ *	@ap: ATA port to be detached
+ *
+ *	Detach all ATA devices and the associated SCSI devices of @ap;
+ *	then, remove the associated SCSI host.  @ap is guaranteed to
+ *	be quiescent on return from this function.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+void ata_port_detach(struct ata_port *ap)
+{
+	unsigned long flags;
+	int i;
+
+	if (!ap->ops->error_handler)
+		goto skip_eh;
+
+	/* tell EH we're leaving & flush EH */
+	spin_lock_irqsave(ap->lock, flags);
+	ap->pflags |= ATA_PFLAG_UNLOADING;
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	ata_port_wait_eh(ap);
+
+	/* EH is now guaranteed to see UNLOADING, so no new device
+	 * will be attached.  Disable all existing devices.
+	 */
+	spin_lock_irqsave(ap->lock, flags);
+
+	for (i = 0; i < ATA_MAX_DEVICES; i++)
+		ata_dev_disable(&ap->device[i]);
+
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	/* Final freeze & EH.  All in-flight commands are aborted.  EH
+	 * will be skipped and retrials will be terminated with bad
+	 * target.
+	 */
+	spin_lock_irqsave(ap->lock, flags);
+	ata_port_freeze(ap);	/* won't be thawed */
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	ata_port_wait_eh(ap);
+
+	/* Flush hotplug task.  The sequence is similar to
+	 * ata_port_flush_task().
+	 */
+	flush_workqueue(ata_aux_wq);
+	cancel_delayed_work(&ap->hotplug_task);
+	flush_workqueue(ata_aux_wq);
+
+ skip_eh:
+	/* remove the associated SCSI host */
+	scsi_remove_host(ap->host);
+}
+
+/**
+ *	ata_host_set_remove - PCI layer callback for device removal
+ *	@host_set: ATA host set that was removed
+ *
+ *	Unregister all objects associated with this host set. Free those
+ *	objects.
+ *
+ *	LOCKING:
+ *	Inherited from calling layer (may sleep).
+ */
+
+void ata_host_set_remove(struct ata_host_set *host_set)
+{
+	unsigned int i;
+
+	for (i = 0; i < host_set->n_ports; i++)
+		ata_port_detach(host_set->ports[i]);
+
+	free_irq(host_set->irq, host_set);
+	if (host_set->irq2)
+		free_irq(host_set->irq2, host_set);
+
+	for (i = 0; i < host_set->n_ports; i++) {
+		struct ata_port *ap = host_set->ports[i];
+
+		ata_scsi_release(ap->host);
+
+		if ((ap->flags & ATA_FLAG_NO_LEGACY) == 0) {
+			struct ata_ioports *ioaddr = &ap->ioaddr;
+
+			/* FIXME: Add -ac IDE pci mods to remove these special cases */
+			if (ioaddr->cmd_addr == ATA_PRIMARY_CMD)
+				release_region(ATA_PRIMARY_CMD, 8);
+			else if (ioaddr->cmd_addr == ATA_SECONDARY_CMD)
+				release_region(ATA_SECONDARY_CMD, 8);
+		}
+
+		scsi_host_put(ap->host);
+	}
+
+	if (host_set->ops->host_stop)
+		host_set->ops->host_stop(host_set);
+
+	kfree(host_set);
+}
+
+/**
+ *	ata_scsi_release - SCSI layer callback hook for host unload
+ *	@host: libata host to be unloaded
+ *
+ *	Performs all duties necessary to shut down a libata port...
+ *	Kill port kthread, disable port, and release resources.
+ *
+ *	LOCKING:
+ *	Inherited from SCSI layer.
+ *
+ *	RETURNS:
+ *	One.
+ */
+
+int ata_scsi_release(struct Scsi_Host *host)
+{
+	struct ata_port *ap = ata_shost_to_port(host);
+
+	DPRINTK("ENTER\n");
+
+	ap->ops->port_disable(ap);
+	ap->ops->port_stop(ap);
+
+	DPRINTK("EXIT\n");
+	return 1;
+}
+
+struct ata_probe_ent *
+ata_probe_ent_alloc(struct device *dev, const struct ata_port_info *port)
+{
+	struct ata_probe_ent *probe_ent;
+
+	probe_ent = kzalloc(sizeof(*probe_ent), GFP_KERNEL);
+	if (!probe_ent) {
+		printk(KERN_ERR DRV_NAME "(%s): out of memory\n",
+		       kobject_name(&(dev->kobj)));
+		return NULL;
+	}
+
+	INIT_LIST_HEAD(&probe_ent->node);
+	probe_ent->dev = dev;
+
+	probe_ent->sht = port->sht;
+	probe_ent->host_flags = port->host_flags;
+	probe_ent->pio_mask = port->pio_mask;
+	probe_ent->mwdma_mask = port->mwdma_mask;
+	probe_ent->udma_mask = port->udma_mask;
+	probe_ent->port_ops = port->port_ops;
+
+	return probe_ent;
+}
+
+/**
+ *	ata_std_ports - initialize ioaddr with standard port offsets.
+ *	@ioaddr: IO address structure to be initialized
+ *
+ *	Utility function which initializes data_addr, error_addr,
+ *	feature_addr, nsect_addr, lbal_addr, lbam_addr, lbah_addr,
+ *	device_addr, status_addr, and command_addr to standard offsets
+ *	relative to cmd_addr.
+ *
+ *	Does not set ctl_addr, altstatus_addr, bmdma_addr, or scr_addr.
+ */
+
+void ata_std_ports(struct ata_ioports *ioaddr)
+{
+	ioaddr->data_addr = ioaddr->cmd_addr + ATA_REG_DATA;
+	ioaddr->error_addr = ioaddr->cmd_addr + ATA_REG_ERR;
+	ioaddr->feature_addr = ioaddr->cmd_addr + ATA_REG_FEATURE;
+	ioaddr->nsect_addr = ioaddr->cmd_addr + ATA_REG_NSECT;
+	ioaddr->lbal_addr = ioaddr->cmd_addr + ATA_REG_LBAL;
+	ioaddr->lbam_addr = ioaddr->cmd_addr + ATA_REG_LBAM;
+	ioaddr->lbah_addr = ioaddr->cmd_addr + ATA_REG_LBAH;
+	ioaddr->device_addr = ioaddr->cmd_addr + ATA_REG_DEVICE;
+	ioaddr->status_addr = ioaddr->cmd_addr + ATA_REG_STATUS;
+	ioaddr->command_addr = ioaddr->cmd_addr + ATA_REG_CMD;
+}
+
+
+#ifdef CONFIG_PCI
+
+void ata_pci_host_stop (struct ata_host_set *host_set)
+{
+	struct pci_dev *pdev = to_pci_dev(host_set->dev);
+
+	pci_iounmap(pdev, host_set->mmio_base);
+}
+
+/**
+ *	ata_pci_remove_one - PCI layer callback for device removal
+ *	@pdev: PCI device that was removed
+ *
+ *	PCI layer indicates to libata via this hook that
+ *	hot-unplug or module unload event has occurred.
+ *	Handle this by unregistering all objects associated
+ *	with this PCI device.  Free those objects.  Then finally
+ *	release PCI resources and disable device.
+ *
+ *	LOCKING:
+ *	Inherited from PCI layer (may sleep).
+ */
+
+void ata_pci_remove_one (struct pci_dev *pdev)
+{
+	struct device *dev = pci_dev_to_dev(pdev);
+	struct ata_host_set *host_set = dev_get_drvdata(dev);
+
+	ata_host_set_remove(host_set);
+
+	pci_release_regions(pdev);
+	pci_disable_device(pdev);
+	dev_set_drvdata(dev, NULL);
+}
+
+/* move to PCI subsystem */
+int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
+{
+	unsigned long tmp = 0;
+
+	switch (bits->width) {
+	case 1: {
+		u8 tmp8 = 0;
+		pci_read_config_byte(pdev, bits->reg, &tmp8);
+		tmp = tmp8;
+		break;
+	}
+	case 2: {
+		u16 tmp16 = 0;
+		pci_read_config_word(pdev, bits->reg, &tmp16);
+		tmp = tmp16;
+		break;
+	}
+	case 4: {
+		u32 tmp32 = 0;
+		pci_read_config_dword(pdev, bits->reg, &tmp32);
+		tmp = tmp32;
+		break;
+	}
+
+	default:
+		return -EINVAL;
+	}
+
+	tmp &= bits->mask;
+
+	return (tmp == bits->val) ? 1 : 0;
+}
+
+void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
+{
+	pci_save_state(pdev);
+
+	if (mesg.event == PM_EVENT_SUSPEND) {
+		pci_disable_device(pdev);
+		pci_set_power_state(pdev, PCI_D3hot);
+	}
+}
+
+void ata_pci_device_do_resume(struct pci_dev *pdev)
+{
+	pci_set_power_state(pdev, PCI_D0);
+	pci_restore_state(pdev);
+	pci_enable_device(pdev);
+	pci_set_master(pdev);
+}
+
+int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
+{
+	struct ata_host_set *host_set = dev_get_drvdata(&pdev->dev);
+	int rc = 0;
+
+	rc = ata_host_set_suspend(host_set, mesg);
+	if (rc)
+		return rc;
+
+	ata_pci_device_do_suspend(pdev, mesg);
+
+	return 0;
+}
+
+int ata_pci_device_resume(struct pci_dev *pdev)
+{
+	struct ata_host_set *host_set = dev_get_drvdata(&pdev->dev);
+
+	ata_pci_device_do_resume(pdev);
+	ata_host_set_resume(host_set);
+	return 0;
+}
+#endif /* CONFIG_PCI */
+
+
+static int __init ata_init(void)
+{
+	ata_probe_timeout *= HZ;
+	ata_wq = create_workqueue("ata");
+	if (!ata_wq)
+		return -ENOMEM;
+
+	ata_aux_wq = create_singlethread_workqueue("ata_aux");
+	if (!ata_aux_wq) {
+		destroy_workqueue(ata_wq);
+		return -ENOMEM;
+	}
+
+	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
+	return 0;
+}
+
+static void __exit ata_exit(void)
+{
+	destroy_workqueue(ata_wq);
+	destroy_workqueue(ata_aux_wq);
+}
+
+module_init(ata_init);
+module_exit(ata_exit);
+
+static unsigned long ratelimit_time;
+static DEFINE_SPINLOCK(ata_ratelimit_lock);
+
+int ata_ratelimit(void)
+{
+	int rc;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ata_ratelimit_lock, flags);
+
+	if (time_after(jiffies, ratelimit_time)) {
+		rc = 1;
+		ratelimit_time = jiffies + (HZ/5);
+	} else
+		rc = 0;
+
+	spin_unlock_irqrestore(&ata_ratelimit_lock, flags);
+
+	return rc;
+}
+
+/**
+ *	ata_wait_register - wait until register value changes
+ *	@reg: IO-mapped register
+ *	@mask: Mask to apply to read register value
+ *	@val: Wait condition
+ *	@interval_msec: polling interval in milliseconds
+ *	@timeout_msec: timeout in milliseconds
+ *
+ *	Waiting for some bits of register to change is a common
+ *	operation for ATA controllers.  This function reads 32bit LE
+ *	IO-mapped register @reg and tests for the following condition.
+ *
+ *	(*@reg & mask) != val
+ *
+ *	If the condition is met, it returns; otherwise, the process is
+ *	repeated after @interval_msec until timeout.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep)
+ *
+ *	RETURNS:
+ *	The final register value.
+ */
+u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
+		      unsigned long interval_msec,
+		      unsigned long timeout_msec)
+{
+	unsigned long timeout;
+	u32 tmp;
+
+	tmp = ioread32(reg);
+
+	/* Calculate timeout _after_ the first read to make sure
+	 * preceding writes reach the controller before starting to
+	 * eat away the timeout.
+	 */
+	timeout = jiffies + (timeout_msec * HZ) / 1000;
+
+	while ((tmp & mask) == val && time_before(jiffies, timeout)) {
+		msleep(interval_msec);
+		tmp = ioread32(reg);
+	}
+
+	return tmp;
+}
+
+/*
+ * Dummy port_ops
+ */
+static void ata_dummy_noret(struct ata_port *ap)	{ }
+static int ata_dummy_ret0(struct ata_port *ap)		{ return 0; }
+static void ata_dummy_qc_noret(struct ata_queued_cmd *qc) { }
+
+static u8 ata_dummy_check_status(struct ata_port *ap)
+{
+	return ATA_DRDY;
+}
+
+static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
+{
+	return AC_ERR_SYSTEM;
+}
+
+const struct ata_port_operations ata_dummy_port_ops = {
+	.port_disable		= ata_port_disable,
+	.check_status		= ata_dummy_check_status,
+	.check_altstatus	= ata_dummy_check_status,
+	.dev_select		= ata_noop_dev_select,
+	.qc_prep		= ata_noop_qc_prep,
+	.qc_issue		= ata_dummy_qc_issue,
+	.freeze			= ata_dummy_noret,
+	.thaw			= ata_dummy_noret,
+	.error_handler		= ata_dummy_noret,
+	.post_internal_cmd	= ata_dummy_qc_noret,
+	.irq_clear		= ata_dummy_noret,
+	.port_start		= ata_dummy_ret0,
+	.port_stop		= ata_dummy_noret,
+};
+
+/*
+ * libata is essentially a library of internal helper functions for
+ * low-level ATA host controller drivers.  As such, the API/ABI is
+ * likely to change as new drivers are added and updated.
+ * Do not depend on ABI/API stability.
+ */
+
+EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
+EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
+EXPORT_SYMBOL_GPL(sata_deb_timing_long);
+EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
+EXPORT_SYMBOL_GPL(ata_std_bios_param);
+EXPORT_SYMBOL_GPL(ata_std_ports);
+EXPORT_SYMBOL_GPL(ata_host_set_init);
+EXPORT_SYMBOL_GPL(ata_device_add);
+EXPORT_SYMBOL_GPL(ata_port_detach);
+EXPORT_SYMBOL_GPL(ata_host_set_remove);
+EXPORT_SYMBOL_GPL(ata_sg_init);
+EXPORT_SYMBOL_GPL(ata_sg_init_one);
+EXPORT_SYMBOL_GPL(ata_hsm_move);
+EXPORT_SYMBOL_GPL(ata_qc_complete);
+EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
+EXPORT_SYMBOL_GPL(ata_qc_issue_prot);
+EXPORT_SYMBOL_GPL(ata_tf_load);
+EXPORT_SYMBOL_GPL(ata_tf_read);
+EXPORT_SYMBOL_GPL(ata_noop_dev_select);
+EXPORT_SYMBOL_GPL(ata_std_dev_select);
+EXPORT_SYMBOL_GPL(ata_tf_to_fis);
+EXPORT_SYMBOL_GPL(ata_tf_from_fis);
+EXPORT_SYMBOL_GPL(ata_check_status);
+EXPORT_SYMBOL_GPL(ata_altstatus);
+EXPORT_SYMBOL_GPL(ata_exec_command);
+EXPORT_SYMBOL_GPL(ata_port_start);
+EXPORT_SYMBOL_GPL(ata_port_stop);
+EXPORT_SYMBOL_GPL(ata_host_stop);
+EXPORT_SYMBOL_GPL(ata_interrupt);
+EXPORT_SYMBOL_GPL(ata_mmio_data_xfer);
+EXPORT_SYMBOL_GPL(ata_pio_data_xfer);
+EXPORT_SYMBOL_GPL(ata_pio_data_xfer_noirq);
+EXPORT_SYMBOL_GPL(ata_qc_prep);
+EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
+EXPORT_SYMBOL_GPL(ata_bmdma_setup);
+EXPORT_SYMBOL_GPL(ata_bmdma_start);
+EXPORT_SYMBOL_GPL(ata_bmdma_irq_clear);
+EXPORT_SYMBOL_GPL(ata_bmdma_status);
+EXPORT_SYMBOL_GPL(ata_bmdma_stop);
+EXPORT_SYMBOL_GPL(ata_bmdma_freeze);
+EXPORT_SYMBOL_GPL(ata_bmdma_thaw);
+EXPORT_SYMBOL_GPL(ata_bmdma_drive_eh);
+EXPORT_SYMBOL_GPL(ata_bmdma_error_handler);
+EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd);
+EXPORT_SYMBOL_GPL(ata_port_probe);
+EXPORT_SYMBOL_GPL(sata_set_spd);
+EXPORT_SYMBOL_GPL(sata_phy_debounce);
+EXPORT_SYMBOL_GPL(sata_phy_resume);
+EXPORT_SYMBOL_GPL(sata_phy_reset);
+EXPORT_SYMBOL_GPL(__sata_phy_reset);
+EXPORT_SYMBOL_GPL(ata_bus_reset);
+EXPORT_SYMBOL_GPL(ata_std_prereset);
+EXPORT_SYMBOL_GPL(ata_std_softreset);
+EXPORT_SYMBOL_GPL(sata_std_hardreset);
+EXPORT_SYMBOL_GPL(ata_std_postreset);
+EXPORT_SYMBOL_GPL(ata_dev_revalidate);
+EXPORT_SYMBOL_GPL(ata_dev_classify);
+EXPORT_SYMBOL_GPL(ata_dev_pair);
+EXPORT_SYMBOL_GPL(ata_port_disable);
+EXPORT_SYMBOL_GPL(ata_ratelimit);
+EXPORT_SYMBOL_GPL(ata_wait_register);
+EXPORT_SYMBOL_GPL(ata_busy_sleep);
+EXPORT_SYMBOL_GPL(ata_port_queue_task);
+EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
+EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
+EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
+EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
+EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
+EXPORT_SYMBOL_GPL(ata_scsi_release);
+EXPORT_SYMBOL_GPL(ata_host_intr);
+EXPORT_SYMBOL_GPL(sata_scr_valid);
+EXPORT_SYMBOL_GPL(sata_scr_read);
+EXPORT_SYMBOL_GPL(sata_scr_write);
+EXPORT_SYMBOL_GPL(sata_scr_write_flush);
+EXPORT_SYMBOL_GPL(ata_port_online);
+EXPORT_SYMBOL_GPL(ata_port_offline);
+EXPORT_SYMBOL_GPL(ata_host_set_suspend);
+EXPORT_SYMBOL_GPL(ata_host_set_resume);
+EXPORT_SYMBOL_GPL(ata_id_string);
+EXPORT_SYMBOL_GPL(ata_id_c_string);
+EXPORT_SYMBOL_GPL(ata_scsi_simulate);
+
+EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
+EXPORT_SYMBOL_GPL(ata_timing_compute);
+EXPORT_SYMBOL_GPL(ata_timing_merge);
+
+#ifdef CONFIG_PCI
+EXPORT_SYMBOL_GPL(pci_test_config_bits);
+EXPORT_SYMBOL_GPL(ata_pci_host_stop);
+EXPORT_SYMBOL_GPL(ata_pci_init_native_mode);
+EXPORT_SYMBOL_GPL(ata_pci_init_one);
+EXPORT_SYMBOL_GPL(ata_pci_remove_one);
+EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
+EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
+EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
+EXPORT_SYMBOL_GPL(ata_pci_device_resume);
+EXPORT_SYMBOL_GPL(ata_pci_default_filter);
+EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
+#endif /* CONFIG_PCI */
+
+EXPORT_SYMBOL_GPL(ata_scsi_device_suspend);
+EXPORT_SYMBOL_GPL(ata_scsi_device_resume);
+
+EXPORT_SYMBOL_GPL(ata_eng_timeout);
+EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
+EXPORT_SYMBOL_GPL(ata_port_abort);
+EXPORT_SYMBOL_GPL(ata_port_freeze);
+EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
+EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
+EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
+EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
+EXPORT_SYMBOL_GPL(ata_do_eh);
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
new file mode 100644
index 0000000..2c476ee
--- /dev/null
+++ b/drivers/ata/libata-eh.c
@@ -0,0 +1,2246 @@
+/*
+ *  libata-eh.c - libata error handling
+ *
+ *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
+ *    		    Please ALWAYS copy linux-ide@vger.kernel.org
+ *		    on emails.
+ *
+ *  Copyright 2006 Tejun Heo <htejun@gmail.com>
+ *
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License as
+ *  published by the Free Software Foundation; either version 2, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
+ *  USA.
+ *
+ *
+ *  libata documentation is available via 'make {ps|pdf}docs',
+ *  as Documentation/DocBook/libata.*
+ *
+ *  Hardware documentation available from http://www.t13.org/ and
+ *  http://www.sata-io.org/
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_cmnd.h>
+#include "../scsi/scsi_transport_api.h"
+
+#include <linux/libata.h>
+
+#include "libata.h"
+
+static void __ata_port_freeze(struct ata_port *ap);
+static void ata_eh_finish(struct ata_port *ap);
+static void ata_eh_handle_port_suspend(struct ata_port *ap);
+static void ata_eh_handle_port_resume(struct ata_port *ap);
+
+static void ata_ering_record(struct ata_ering *ering, int is_io,
+			     unsigned int err_mask)
+{
+	struct ata_ering_entry *ent;
+
+	WARN_ON(!err_mask);
+
+	ering->cursor++;
+	ering->cursor %= ATA_ERING_SIZE;
+
+	ent = &ering->ring[ering->cursor];
+	ent->is_io = is_io;
+	ent->err_mask = err_mask;
+	ent->timestamp = get_jiffies_64();
+}
+
+static struct ata_ering_entry * ata_ering_top(struct ata_ering *ering)
+{
+	struct ata_ering_entry *ent = &ering->ring[ering->cursor];
+	if (!ent->err_mask)
+		return NULL;
+	return ent;
+}
+
+static int ata_ering_map(struct ata_ering *ering,
+			 int (*map_fn)(struct ata_ering_entry *, void *),
+			 void *arg)
+{
+	int idx, rc = 0;
+	struct ata_ering_entry *ent;
+
+	idx = ering->cursor;
+	do {
+		ent = &ering->ring[idx];
+		if (!ent->err_mask)
+			break;
+		rc = map_fn(ent, arg);
+		if (rc)
+			break;
+		idx = (idx - 1 + ATA_ERING_SIZE) % ATA_ERING_SIZE;
+	} while (idx != ering->cursor);
+
+	return rc;
+}
+
+static unsigned int ata_eh_dev_action(struct ata_device *dev)
+{
+	struct ata_eh_context *ehc = &dev->ap->eh_context;
+
+	return ehc->i.action | ehc->i.dev_action[dev->devno];
+}
+
+static void ata_eh_clear_action(struct ata_device *dev,
+				struct ata_eh_info *ehi, unsigned int action)
+{
+	int i;
+
+	if (!dev) {
+		ehi->action &= ~action;
+		for (i = 0; i < ATA_MAX_DEVICES; i++)
+			ehi->dev_action[i] &= ~action;
+	} else {
+		/* doesn't make sense for port-wide EH actions */
+		WARN_ON(!(action & ATA_EH_PERDEV_MASK));
+
+		/* break ehi->action into ehi->dev_action */
+		if (ehi->action & action) {
+			for (i = 0; i < ATA_MAX_DEVICES; i++)
+				ehi->dev_action[i] |= ehi->action & action;
+			ehi->action &= ~action;
+		}
+
+		/* turn off the specified per-dev action */
+		ehi->dev_action[dev->devno] &= ~action;
+	}
+}
+
+/**
+ *	ata_scsi_timed_out - SCSI layer time out callback
+ *	@cmd: timed out SCSI command
+ *
+ *	Handles SCSI layer timeout.  We race with normal completion of
+ *	the qc for @cmd.  If the qc is already gone, we lose and let
+ *	the scsi command finish (EH_HANDLED).  Otherwise, the qc has
+ *	timed out and EH should be invoked.  Prevent ata_qc_complete()
+ *	from finishing it by setting EH_SCHEDULED and return
+ *	EH_NOT_HANDLED.
+ *
+ *	TODO: kill this function once old EH is gone.
+ *
+ *	LOCKING:
+ *	Called from timer context
+ *
+ *	RETURNS:
+ *	EH_HANDLED or EH_NOT_HANDLED
+ */
+enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd)
+{
+	struct Scsi_Host *host = cmd->device->host;
+	struct ata_port *ap = ata_shost_to_port(host);
+	unsigned long flags;
+	struct ata_queued_cmd *qc;
+	enum scsi_eh_timer_return ret;
+
+	DPRINTK("ENTER\n");
+
+	if (ap->ops->error_handler) {
+		ret = EH_NOT_HANDLED;
+		goto out;
+	}
+
+	ret = EH_HANDLED;
+	spin_lock_irqsave(ap->lock, flags);
+	qc = ata_qc_from_tag(ap, ap->active_tag);
+	if (qc) {
+		WARN_ON(qc->scsicmd != cmd);
+		qc->flags |= ATA_QCFLAG_EH_SCHEDULED;
+		qc->err_mask |= AC_ERR_TIMEOUT;
+		ret = EH_NOT_HANDLED;
+	}
+	spin_unlock_irqrestore(ap->lock, flags);
+
+ out:
+	DPRINTK("EXIT, ret=%d\n", ret);
+	return ret;
+}
+
+/**
+ *	ata_scsi_error - SCSI layer error handler callback
+ *	@host: SCSI host on which error occurred
+ *
+ *	Handles SCSI-layer-thrown error events.
+ *
+ *	LOCKING:
+ *	Inherited from SCSI layer (none, can sleep)
+ *
+ *	RETURNS:
+ *	Zero.
+ */
+void ata_scsi_error(struct Scsi_Host *host)
+{
+	struct ata_port *ap = ata_shost_to_port(host);
+	int i, repeat_cnt = ATA_EH_MAX_REPEAT;
+	unsigned long flags;
+
+	DPRINTK("ENTER\n");
+
+	/* synchronize with port task */
+	ata_port_flush_task(ap);
+
+	/* synchronize with host_set lock and sort out timeouts */
+
+	/* For new EH, all qcs are finished in one of three ways -
+	 * normal completion, error completion, and SCSI timeout.
+	 * Both cmpletions can race against SCSI timeout.  When normal
+	 * completion wins, the qc never reaches EH.  When error
+	 * completion wins, the qc has ATA_QCFLAG_FAILED set.
+	 *
+	 * When SCSI timeout wins, things are a bit more complex.
+	 * Normal or error completion can occur after the timeout but
+	 * before this point.  In such cases, both types of
+	 * completions are honored.  A scmd is determined to have
+	 * timed out iff its associated qc is active and not failed.
+	 */
+	if (ap->ops->error_handler) {
+		struct scsi_cmnd *scmd, *tmp;
+		int nr_timedout = 0;
+
+		spin_lock_irqsave(ap->lock, flags);
+
+		list_for_each_entry_safe(scmd, tmp, &host->eh_cmd_q, eh_entry) {
+			struct ata_queued_cmd *qc;
+
+			for (i = 0; i < ATA_MAX_QUEUE; i++) {
+				qc = __ata_qc_from_tag(ap, i);
+				if (qc->flags & ATA_QCFLAG_ACTIVE &&
+				    qc->scsicmd == scmd)
+					break;
+			}
+
+			if (i < ATA_MAX_QUEUE) {
+				/* the scmd has an associated qc */
+				if (!(qc->flags & ATA_QCFLAG_FAILED)) {
+					/* which hasn't failed yet, timeout */
+					qc->err_mask |= AC_ERR_TIMEOUT;
+					qc->flags |= ATA_QCFLAG_FAILED;
+					nr_timedout++;
+				}
+			} else {
+				/* Normal completion occurred after
+				 * SCSI timeout but before this point.
+				 * Successfully complete it.
+				 */
+				scmd->retries = scmd->allowed;
+				scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
+			}
+		}
+
+		/* If we have timed out qcs.  They belong to EH from
+		 * this point but the state of the controller is
+		 * unknown.  Freeze the port to make sure the IRQ
+		 * handler doesn't diddle with those qcs.  This must
+		 * be done atomically w.r.t. setting QCFLAG_FAILED.
+		 */
+		if (nr_timedout)
+			__ata_port_freeze(ap);
+
+		spin_unlock_irqrestore(ap->lock, flags);
+	} else
+		spin_unlock_wait(ap->lock);
+
+ repeat:
+	/* invoke error handler */
+	if (ap->ops->error_handler) {
+		/* process port resume request */
+		ata_eh_handle_port_resume(ap);
+
+		/* fetch & clear EH info */
+		spin_lock_irqsave(ap->lock, flags);
+
+		memset(&ap->eh_context, 0, sizeof(ap->eh_context));
+		ap->eh_context.i = ap->eh_info;
+		memset(&ap->eh_info, 0, sizeof(ap->eh_info));
+
+		ap->pflags |= ATA_PFLAG_EH_IN_PROGRESS;
+		ap->pflags &= ~ATA_PFLAG_EH_PENDING;
+
+		spin_unlock_irqrestore(ap->lock, flags);
+
+		/* invoke EH, skip if unloading or suspended */
+		if (!(ap->pflags & (ATA_PFLAG_UNLOADING | ATA_PFLAG_SUSPENDED)))
+			ap->ops->error_handler(ap);
+		else
+			ata_eh_finish(ap);
+
+		/* process port suspend request */
+		ata_eh_handle_port_suspend(ap);
+
+		/* Exception might have happend after ->error_handler
+		 * recovered the port but before this point.  Repeat
+		 * EH in such case.
+		 */
+		spin_lock_irqsave(ap->lock, flags);
+
+		if (ap->pflags & ATA_PFLAG_EH_PENDING) {
+			if (--repeat_cnt) {
+				ata_port_printk(ap, KERN_INFO,
+					"EH pending after completion, "
+					"repeating EH (cnt=%d)\n", repeat_cnt);
+				spin_unlock_irqrestore(ap->lock, flags);
+				goto repeat;
+			}
+			ata_port_printk(ap, KERN_ERR, "EH pending after %d "
+					"tries, giving up\n", ATA_EH_MAX_REPEAT);
+		}
+
+		/* this run is complete, make sure EH info is clear */
+		memset(&ap->eh_info, 0, sizeof(ap->eh_info));
+
+		/* Clear host_eh_scheduled while holding ap->lock such
+		 * that if exception occurs after this point but
+		 * before EH completion, SCSI midlayer will
+		 * re-initiate EH.
+		 */
+		host->host_eh_scheduled = 0;
+
+		spin_unlock_irqrestore(ap->lock, flags);
+	} else {
+		WARN_ON(ata_qc_from_tag(ap, ap->active_tag) == NULL);
+		ap->ops->eng_timeout(ap);
+	}
+
+	/* finish or retry handled scmd's and clean up */
+	WARN_ON(host->host_failed || !list_empty(&host->eh_cmd_q));
+
+	scsi_eh_flush_done_q(&ap->eh_done_q);
+
+	/* clean up */
+	spin_lock_irqsave(ap->lock, flags);
+
+	if (ap->pflags & ATA_PFLAG_LOADING)
+		ap->pflags &= ~ATA_PFLAG_LOADING;
+	else if (ap->pflags & ATA_PFLAG_SCSI_HOTPLUG)
+		queue_work(ata_aux_wq, &ap->hotplug_task);
+
+	if (ap->pflags & ATA_PFLAG_RECOVERED)
+		ata_port_printk(ap, KERN_INFO, "EH complete\n");
+
+	ap->pflags &= ~(ATA_PFLAG_SCSI_HOTPLUG | ATA_PFLAG_RECOVERED);
+
+	/* tell wait_eh that we're done */
+	ap->pflags &= ~ATA_PFLAG_EH_IN_PROGRESS;
+	wake_up_all(&ap->eh_wait_q);
+
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	DPRINTK("EXIT\n");
+}
+
+/**
+ *	ata_port_wait_eh - Wait for the currently pending EH to complete
+ *	@ap: Port to wait EH for
+ *
+ *	Wait until the currently pending EH is complete.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+void ata_port_wait_eh(struct ata_port *ap)
+{
+	unsigned long flags;
+	DEFINE_WAIT(wait);
+
+ retry:
+	spin_lock_irqsave(ap->lock, flags);
+
+	while (ap->pflags & (ATA_PFLAG_EH_PENDING | ATA_PFLAG_EH_IN_PROGRESS)) {
+		prepare_to_wait(&ap->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
+		spin_unlock_irqrestore(ap->lock, flags);
+		schedule();
+		spin_lock_irqsave(ap->lock, flags);
+	}
+	finish_wait(&ap->eh_wait_q, &wait);
+
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	/* make sure SCSI EH is complete */
+	if (scsi_host_in_recovery(ap->host)) {
+		msleep(10);
+		goto retry;
+	}
+}
+
+/**
+ *	ata_qc_timeout - Handle timeout of queued command
+ *	@qc: Command that timed out
+ *
+ *	Some part of the kernel (currently, only the SCSI layer)
+ *	has noticed that the active command on port @ap has not
+ *	completed after a specified length of time.  Handle this
+ *	condition by disabling DMA (if necessary) and completing
+ *	transactions, with error if necessary.
+ *
+ *	This also handles the case of the "lost interrupt", where
+ *	for some reason (possibly hardware bug, possibly driver bug)
+ *	an interrupt was not delivered to the driver, even though the
+ *	transaction completed successfully.
+ *
+ *	TODO: kill this function once old EH is gone.
+ *
+ *	LOCKING:
+ *	Inherited from SCSI layer (none, can sleep)
+ */
+static void ata_qc_timeout(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	u8 host_stat = 0, drv_stat;
+	unsigned long flags;
+
+	DPRINTK("ENTER\n");
+
+	ap->hsm_task_state = HSM_ST_IDLE;
+
+	spin_lock_irqsave(ap->lock, flags);
+
+	switch (qc->tf.protocol) {
+
+	case ATA_PROT_DMA:
+	case ATA_PROT_ATAPI_DMA:
+		host_stat = ap->ops->bmdma_status(ap);
+
+		/* before we do anything else, clear DMA-Start bit */
+		ap->ops->bmdma_stop(qc);
+
+		/* fall through */
+
+	default:
+		ata_altstatus(ap);
+		drv_stat = ata_chk_status(ap);
+
+		/* ack bmdma irq events */
+		ap->ops->irq_clear(ap);
+
+		ata_dev_printk(qc->dev, KERN_ERR, "command 0x%x timeout, "
+			       "stat 0x%x host_stat 0x%x\n",
+			       qc->tf.command, drv_stat, host_stat);
+
+		/* complete taskfile transaction */
+		qc->err_mask |= AC_ERR_TIMEOUT;
+		break;
+	}
+
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	ata_eh_qc_complete(qc);
+
+	DPRINTK("EXIT\n");
+}
+
+/**
+ *	ata_eng_timeout - Handle timeout of queued command
+ *	@ap: Port on which timed-out command is active
+ *
+ *	Some part of the kernel (currently, only the SCSI layer)
+ *	has noticed that the active command on port @ap has not
+ *	completed after a specified length of time.  Handle this
+ *	condition by disabling DMA (if necessary) and completing
+ *	transactions, with error if necessary.
+ *
+ *	This also handles the case of the "lost interrupt", where
+ *	for some reason (possibly hardware bug, possibly driver bug)
+ *	an interrupt was not delivered to the driver, even though the
+ *	transaction completed successfully.
+ *
+ *	TODO: kill this function once old EH is gone.
+ *
+ *	LOCKING:
+ *	Inherited from SCSI layer (none, can sleep)
+ */
+void ata_eng_timeout(struct ata_port *ap)
+{
+	DPRINTK("ENTER\n");
+
+	ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag));
+
+	DPRINTK("EXIT\n");
+}
+
+/**
+ *	ata_qc_schedule_eh - schedule qc for error handling
+ *	@qc: command to schedule error handling for
+ *
+ *	Schedule error handling for @qc.  EH will kick in as soon as
+ *	other commands are drained.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+void ata_qc_schedule_eh(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+
+	WARN_ON(!ap->ops->error_handler);
+
+	qc->flags |= ATA_QCFLAG_FAILED;
+	qc->ap->pflags |= ATA_PFLAG_EH_PENDING;
+
+	/* The following will fail if timeout has already expired.
+	 * ata_scsi_error() takes care of such scmds on EH entry.
+	 * Note that ATA_QCFLAG_FAILED is unconditionally set after
+	 * this function completes.
+	 */
+	scsi_req_abort_cmd(qc->scsicmd);
+}
+
+/**
+ *	ata_port_schedule_eh - schedule error handling without a qc
+ *	@ap: ATA port to schedule EH for
+ *
+ *	Schedule error handling for @ap.  EH will kick in as soon as
+ *	all commands are drained.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+void ata_port_schedule_eh(struct ata_port *ap)
+{
+	WARN_ON(!ap->ops->error_handler);
+
+	ap->pflags |= ATA_PFLAG_EH_PENDING;
+	scsi_schedule_eh(ap->host);
+
+	DPRINTK("port EH scheduled\n");
+}
+
+/**
+ *	ata_port_abort - abort all qc's on the port
+ *	@ap: ATA port to abort qc's for
+ *
+ *	Abort all active qc's of @ap and schedule EH.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	Number of aborted qc's.
+ */
+int ata_port_abort(struct ata_port *ap)
+{
+	int tag, nr_aborted = 0;
+
+	WARN_ON(!ap->ops->error_handler);
+
+	for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
+		struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag);
+
+		if (qc) {
+			qc->flags |= ATA_QCFLAG_FAILED;
+			ata_qc_complete(qc);
+			nr_aborted++;
+		}
+	}
+
+	if (!nr_aborted)
+		ata_port_schedule_eh(ap);
+
+	return nr_aborted;
+}
+
+/**
+ *	__ata_port_freeze - freeze port
+ *	@ap: ATA port to freeze
+ *
+ *	This function is called when HSM violation or some other
+ *	condition disrupts normal operation of the port.  Frozen port
+ *	is not allowed to perform any operation until the port is
+ *	thawed, which usually follows a successful reset.
+ *
+ *	ap->ops->freeze() callback can be used for freezing the port
+ *	hardware-wise (e.g. mask interrupt and stop DMA engine).  If a
+ *	port cannot be frozen hardware-wise, the interrupt handler
+ *	must ack and clear interrupts unconditionally while the port
+ *	is frozen.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+static void __ata_port_freeze(struct ata_port *ap)
+{
+	WARN_ON(!ap->ops->error_handler);
+
+	if (ap->ops->freeze)
+		ap->ops->freeze(ap);
+
+	ap->pflags |= ATA_PFLAG_FROZEN;
+
+	DPRINTK("ata%u port frozen\n", ap->id);
+}
+
+/**
+ *	ata_port_freeze - abort & freeze port
+ *	@ap: ATA port to freeze
+ *
+ *	Abort and freeze @ap.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	Number of aborted commands.
+ */
+int ata_port_freeze(struct ata_port *ap)
+{
+	int nr_aborted;
+
+	WARN_ON(!ap->ops->error_handler);
+
+	nr_aborted = ata_port_abort(ap);
+	__ata_port_freeze(ap);
+
+	return nr_aborted;
+}
+
+/**
+ *	ata_eh_freeze_port - EH helper to freeze port
+ *	@ap: ATA port to freeze
+ *
+ *	Freeze @ap.
+ *
+ *	LOCKING:
+ *	None.
+ */
+void ata_eh_freeze_port(struct ata_port *ap)
+{
+	unsigned long flags;
+
+	if (!ap->ops->error_handler)
+		return;
+
+	spin_lock_irqsave(ap->lock, flags);
+	__ata_port_freeze(ap);
+	spin_unlock_irqrestore(ap->lock, flags);
+}
+
+/**
+ *	ata_port_thaw_port - EH helper to thaw port
+ *	@ap: ATA port to thaw
+ *
+ *	Thaw frozen port @ap.
+ *
+ *	LOCKING:
+ *	None.
+ */
+void ata_eh_thaw_port(struct ata_port *ap)
+{
+	unsigned long flags;
+
+	if (!ap->ops->error_handler)
+		return;
+
+	spin_lock_irqsave(ap->lock, flags);
+
+	ap->pflags &= ~ATA_PFLAG_FROZEN;
+
+	if (ap->ops->thaw)
+		ap->ops->thaw(ap);
+
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	DPRINTK("ata%u port thawed\n", ap->id);
+}
+
+static void ata_eh_scsidone(struct scsi_cmnd *scmd)
+{
+	/* nada */
+}
+
+static void __ata_eh_qc_complete(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct scsi_cmnd *scmd = qc->scsicmd;
+	unsigned long flags;
+
+	spin_lock_irqsave(ap->lock, flags);
+	qc->scsidone = ata_eh_scsidone;
+	__ata_qc_complete(qc);
+	WARN_ON(ata_tag_valid(qc->tag));
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
+}
+
+/**
+ *	ata_eh_qc_complete - Complete an active ATA command from EH
+ *	@qc: Command to complete
+ *
+ *	Indicate to the mid and upper layers that an ATA command has
+ *	completed.  To be used from EH.
+ */
+void ata_eh_qc_complete(struct ata_queued_cmd *qc)
+{
+	struct scsi_cmnd *scmd = qc->scsicmd;
+	scmd->retries = scmd->allowed;
+	__ata_eh_qc_complete(qc);
+}
+
+/**
+ *	ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
+ *	@qc: Command to retry
+ *
+ *	Indicate to the mid and upper layers that an ATA command
+ *	should be retried.  To be used from EH.
+ *
+ *	SCSI midlayer limits the number of retries to scmd->allowed.
+ *	scmd->retries is decremented for commands which get retried
+ *	due to unrelated failures (qc->err_mask is zero).
+ */
+void ata_eh_qc_retry(struct ata_queued_cmd *qc)
+{
+	struct scsi_cmnd *scmd = qc->scsicmd;
+	if (!qc->err_mask && scmd->retries)
+		scmd->retries--;
+	__ata_eh_qc_complete(qc);
+}
+
+/**
+ *	ata_eh_detach_dev - detach ATA device
+ *	@dev: ATA device to detach
+ *
+ *	Detach @dev.
+ *
+ *	LOCKING:
+ *	None.
+ */
+static void ata_eh_detach_dev(struct ata_device *dev)
+{
+	struct ata_port *ap = dev->ap;
+	unsigned long flags;
+
+	ata_dev_disable(dev);
+
+	spin_lock_irqsave(ap->lock, flags);
+
+	dev->flags &= ~ATA_DFLAG_DETACH;
+
+	if (ata_scsi_offline_dev(dev)) {
+		dev->flags |= ATA_DFLAG_DETACHED;
+		ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG;
+	}
+
+	/* clear per-dev EH actions */
+	ata_eh_clear_action(dev, &ap->eh_info, ATA_EH_PERDEV_MASK);
+	ata_eh_clear_action(dev, &ap->eh_context.i, ATA_EH_PERDEV_MASK);
+
+	spin_unlock_irqrestore(ap->lock, flags);
+}
+
+/**
+ *	ata_eh_about_to_do - about to perform eh_action
+ *	@ap: target ATA port
+ *	@dev: target ATA dev for per-dev action (can be NULL)
+ *	@action: action about to be performed
+ *
+ *	Called just before performing EH actions to clear related bits
+ *	in @ap->eh_info such that eh actions are not unnecessarily
+ *	repeated.
+ *
+ *	LOCKING:
+ *	None.
+ */
+static void ata_eh_about_to_do(struct ata_port *ap, struct ata_device *dev,
+			       unsigned int action)
+{
+	unsigned long flags;
+	struct ata_eh_info *ehi = &ap->eh_info;
+	struct ata_eh_context *ehc = &ap->eh_context;
+
+	spin_lock_irqsave(ap->lock, flags);
+
+	/* Reset is represented by combination of actions and EHI
+	 * flags.  Suck in all related bits before clearing eh_info to
+	 * avoid losing requested action.
+	 */
+	if (action & ATA_EH_RESET_MASK) {
+		ehc->i.action |= ehi->action & ATA_EH_RESET_MASK;
+		ehc->i.flags |= ehi->flags & ATA_EHI_RESET_MODIFIER_MASK;
+
+		/* make sure all reset actions are cleared & clear EHI flags */
+		action |= ATA_EH_RESET_MASK;
+		ehi->flags &= ~ATA_EHI_RESET_MODIFIER_MASK;
+	}
+
+	ata_eh_clear_action(dev, ehi, action);
+
+	if (!(ehc->i.flags & ATA_EHI_QUIET))
+		ap->pflags |= ATA_PFLAG_RECOVERED;
+
+	spin_unlock_irqrestore(ap->lock, flags);
+}
+
+/**
+ *	ata_eh_done - EH action complete
+ *	@ap: target ATA port
+ *	@dev: target ATA dev for per-dev action (can be NULL)
+ *	@action: action just completed
+ *
+ *	Called right after performing EH actions to clear related bits
+ *	in @ap->eh_context.
+ *
+ *	LOCKING:
+ *	None.
+ */
+static void ata_eh_done(struct ata_port *ap, struct ata_device *dev,
+			unsigned int action)
+{
+	/* if reset is complete, clear all reset actions & reset modifier */
+	if (action & ATA_EH_RESET_MASK) {
+		action |= ATA_EH_RESET_MASK;
+		ap->eh_context.i.flags &= ~ATA_EHI_RESET_MODIFIER_MASK;
+	}
+
+	ata_eh_clear_action(dev, &ap->eh_context.i, action);
+}
+
+/**
+ *	ata_err_string - convert err_mask to descriptive string
+ *	@err_mask: error mask to convert to string
+ *
+ *	Convert @err_mask to descriptive string.  Errors are
+ *	prioritized according to severity and only the most severe
+ *	error is reported.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	Descriptive string for @err_mask
+ */
+static const char * ata_err_string(unsigned int err_mask)
+{
+	if (err_mask & AC_ERR_HOST_BUS)
+		return "host bus error";
+	if (err_mask & AC_ERR_ATA_BUS)
+		return "ATA bus error";
+	if (err_mask & AC_ERR_TIMEOUT)
+		return "timeout";
+	if (err_mask & AC_ERR_HSM)
+		return "HSM violation";
+	if (err_mask & AC_ERR_SYSTEM)
+		return "internal error";
+	if (err_mask & AC_ERR_MEDIA)
+		return "media error";
+	if (err_mask & AC_ERR_INVALID)
+		return "invalid argument";
+	if (err_mask & AC_ERR_DEV)
+		return "device error";
+	return "unknown error";
+}
+
+/**
+ *	ata_read_log_page - read a specific log page
+ *	@dev: target device
+ *	@page: page to read
+ *	@buf: buffer to store read page
+ *	@sectors: number of sectors to read
+ *
+ *	Read log page using READ_LOG_EXT command.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, AC_ERR_* mask otherwise.
+ */
+static unsigned int ata_read_log_page(struct ata_device *dev,
+				      u8 page, void *buf, unsigned int sectors)
+{
+	struct ata_taskfile tf;
+	unsigned int err_mask;
+
+	DPRINTK("read log page - page %d\n", page);
+
+	ata_tf_init(dev, &tf);
+	tf.command = ATA_CMD_READ_LOG_EXT;
+	tf.lbal = page;
+	tf.nsect = sectors;
+	tf.hob_nsect = sectors >> 8;
+	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_LBA48 | ATA_TFLAG_DEVICE;
+	tf.protocol = ATA_PROT_PIO;
+
+	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
+				     buf, sectors * ATA_SECT_SIZE);
+
+	DPRINTK("EXIT, err_mask=%x\n", err_mask);
+	return err_mask;
+}
+
+/**
+ *	ata_eh_read_log_10h - Read log page 10h for NCQ error details
+ *	@dev: Device to read log page 10h from
+ *	@tag: Resulting tag of the failed command
+ *	@tf: Resulting taskfile registers of the failed command
+ *
+ *	Read log page 10h to obtain NCQ error details and clear error
+ *	condition.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise.
+ */
+static int ata_eh_read_log_10h(struct ata_device *dev,
+			       int *tag, struct ata_taskfile *tf)
+{
+	u8 *buf = dev->ap->sector_buf;
+	unsigned int err_mask;
+	u8 csum;
+	int i;
+
+	err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, buf, 1);
+	if (err_mask)
+		return -EIO;
+
+	csum = 0;
+	for (i = 0; i < ATA_SECT_SIZE; i++)
+		csum += buf[i];
+	if (csum)
+		ata_dev_printk(dev, KERN_WARNING,
+			       "invalid checksum 0x%x on log page 10h\n", csum);
+
+	if (buf[0] & 0x80)
+		return -ENOENT;
+
+	*tag = buf[0] & 0x1f;
+
+	tf->command = buf[2];
+	tf->feature = buf[3];
+	tf->lbal = buf[4];
+	tf->lbam = buf[5];
+	tf->lbah = buf[6];
+	tf->device = buf[7];
+	tf->hob_lbal = buf[8];
+	tf->hob_lbam = buf[9];
+	tf->hob_lbah = buf[10];
+	tf->nsect = buf[12];
+	tf->hob_nsect = buf[13];
+
+	return 0;
+}
+
+/**
+ *	atapi_eh_request_sense - perform ATAPI REQUEST_SENSE
+ *	@dev: device to perform REQUEST_SENSE to
+ *	@sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long)
+ *
+ *	Perform ATAPI REQUEST_SENSE after the device reported CHECK
+ *	SENSE.  This function is EH helper.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, AC_ERR_* mask on failure
+ */
+static unsigned int atapi_eh_request_sense(struct ata_device *dev,
+					   unsigned char *sense_buf)
+{
+	struct ata_port *ap = dev->ap;
+	struct ata_taskfile tf;
+	u8 cdb[ATAPI_CDB_LEN];
+
+	DPRINTK("ATAPI request sense\n");
+
+	ata_tf_init(dev, &tf);
+
+	/* FIXME: is this needed? */
+	memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
+
+	/* XXX: why tf_read here? */
+	ap->ops->tf_read(ap, &tf);
+
+	/* fill these in, for the case where they are -not- overwritten */
+	sense_buf[0] = 0x70;
+	sense_buf[2] = tf.feature >> 4;
+
+	memset(cdb, 0, ATAPI_CDB_LEN);
+	cdb[0] = REQUEST_SENSE;
+	cdb[4] = SCSI_SENSE_BUFFERSIZE;
+
+	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+	tf.command = ATA_CMD_PACKET;
+
+	/* is it pointless to prefer PIO for "safety reasons"? */
+	if (ap->flags & ATA_FLAG_PIO_DMA) {
+		tf.protocol = ATA_PROT_ATAPI_DMA;
+		tf.feature |= ATAPI_PKT_DMA;
+	} else {
+		tf.protocol = ATA_PROT_ATAPI;
+		tf.lbam = (8 * 1024) & 0xff;
+		tf.lbah = (8 * 1024) >> 8;
+	}
+
+	return ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE,
+				 sense_buf, SCSI_SENSE_BUFFERSIZE);
+}
+
+/**
+ *	ata_eh_analyze_serror - analyze SError for a failed port
+ *	@ap: ATA port to analyze SError for
+ *
+ *	Analyze SError if available and further determine cause of
+ *	failure.
+ *
+ *	LOCKING:
+ *	None.
+ */
+static void ata_eh_analyze_serror(struct ata_port *ap)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+	u32 serror = ehc->i.serror;
+	unsigned int err_mask = 0, action = 0;
+
+	if (serror & SERR_PERSISTENT) {
+		err_mask |= AC_ERR_ATA_BUS;
+		action |= ATA_EH_HARDRESET;
+	}
+	if (serror &
+	    (SERR_DATA_RECOVERED | SERR_COMM_RECOVERED | SERR_DATA)) {
+		err_mask |= AC_ERR_ATA_BUS;
+		action |= ATA_EH_SOFTRESET;
+	}
+	if (serror & SERR_PROTOCOL) {
+		err_mask |= AC_ERR_HSM;
+		action |= ATA_EH_SOFTRESET;
+	}
+	if (serror & SERR_INTERNAL) {
+		err_mask |= AC_ERR_SYSTEM;
+		action |= ATA_EH_SOFTRESET;
+	}
+	if (serror & (SERR_PHYRDY_CHG | SERR_DEV_XCHG))
+		ata_ehi_hotplugged(&ehc->i);
+
+	ehc->i.err_mask |= err_mask;
+	ehc->i.action |= action;
+}
+
+/**
+ *	ata_eh_analyze_ncq_error - analyze NCQ error
+ *	@ap: ATA port to analyze NCQ error for
+ *
+ *	Read log page 10h, determine the offending qc and acquire
+ *	error status TF.  For NCQ device errors, all LLDDs have to do
+ *	is setting AC_ERR_DEV in ehi->err_mask.  This function takes
+ *	care of the rest.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+static void ata_eh_analyze_ncq_error(struct ata_port *ap)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+	struct ata_device *dev = ap->device;
+	struct ata_queued_cmd *qc;
+	struct ata_taskfile tf;
+	int tag, rc;
+
+	/* if frozen, we can't do much */
+	if (ap->pflags & ATA_PFLAG_FROZEN)
+		return;
+
+	/* is it NCQ device error? */
+	if (!ap->sactive || !(ehc->i.err_mask & AC_ERR_DEV))
+		return;
+
+	/* has LLDD analyzed already? */
+	for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
+		qc = __ata_qc_from_tag(ap, tag);
+
+		if (!(qc->flags & ATA_QCFLAG_FAILED))
+			continue;
+
+		if (qc->err_mask)
+			return;
+	}
+
+	/* okay, this error is ours */
+	rc = ata_eh_read_log_10h(dev, &tag, &tf);
+	if (rc) {
+		ata_port_printk(ap, KERN_ERR, "failed to read log page 10h "
+				"(errno=%d)\n", rc);
+		return;
+	}
+
+	if (!(ap->sactive & (1 << tag))) {
+		ata_port_printk(ap, KERN_ERR, "log page 10h reported "
+				"inactive tag %d\n", tag);
+		return;
+	}
+
+	/* we've got the perpetrator, condemn it */
+	qc = __ata_qc_from_tag(ap, tag);
+	memcpy(&qc->result_tf, &tf, sizeof(tf));
+	qc->err_mask |= AC_ERR_DEV;
+	ehc->i.err_mask &= ~AC_ERR_DEV;
+}
+
+/**
+ *	ata_eh_analyze_tf - analyze taskfile of a failed qc
+ *	@qc: qc to analyze
+ *	@tf: Taskfile registers to analyze
+ *
+ *	Analyze taskfile of @qc and further determine cause of
+ *	failure.  This function also requests ATAPI sense data if
+ *	avaliable.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	Determined recovery action
+ */
+static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd *qc,
+				      const struct ata_taskfile *tf)
+{
+	unsigned int tmp, action = 0;
+	u8 stat = tf->command, err = tf->feature;
+
+	if ((stat & (ATA_BUSY | ATA_DRQ | ATA_DRDY)) != ATA_DRDY) {
+		qc->err_mask |= AC_ERR_HSM;
+		return ATA_EH_SOFTRESET;
+	}
+
+	if (!(qc->err_mask & AC_ERR_DEV))
+		return 0;
+
+	switch (qc->dev->class) {
+	case ATA_DEV_ATA:
+		if (err & ATA_ICRC)
+			qc->err_mask |= AC_ERR_ATA_BUS;
+		if (err & ATA_UNC)
+			qc->err_mask |= AC_ERR_MEDIA;
+		if (err & ATA_IDNF)
+			qc->err_mask |= AC_ERR_INVALID;
+		break;
+
+	case ATA_DEV_ATAPI:
+		tmp = atapi_eh_request_sense(qc->dev,
+					     qc->scsicmd->sense_buffer);
+		if (!tmp) {
+			/* ATA_QCFLAG_SENSE_VALID is used to tell
+			 * atapi_qc_complete() that sense data is
+			 * already valid.
+			 *
+			 * TODO: interpret sense data and set
+			 * appropriate err_mask.
+			 */
+			qc->flags |= ATA_QCFLAG_SENSE_VALID;
+		} else
+			qc->err_mask |= tmp;
+	}
+
+	if (qc->err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT | AC_ERR_ATA_BUS))
+		action |= ATA_EH_SOFTRESET;
+
+	return action;
+}
+
+static int ata_eh_categorize_ering_entry(struct ata_ering_entry *ent)
+{
+	if (ent->err_mask & (AC_ERR_ATA_BUS | AC_ERR_TIMEOUT))
+		return 1;
+
+	if (ent->is_io) {
+		if (ent->err_mask & AC_ERR_HSM)
+			return 1;
+		if ((ent->err_mask &
+		     (AC_ERR_DEV|AC_ERR_MEDIA|AC_ERR_INVALID)) == AC_ERR_DEV)
+			return 2;
+	}
+
+	return 0;
+}
+
+struct speed_down_needed_arg {
+	u64 since;
+	int nr_errors[3];
+};
+
+static int speed_down_needed_cb(struct ata_ering_entry *ent, void *void_arg)
+{
+	struct speed_down_needed_arg *arg = void_arg;
+
+	if (ent->timestamp < arg->since)
+		return -1;
+
+	arg->nr_errors[ata_eh_categorize_ering_entry(ent)]++;
+	return 0;
+}
+
+/**
+ *	ata_eh_speed_down_needed - Determine wheter speed down is necessary
+ *	@dev: Device of interest
+ *
+ *	This function examines error ring of @dev and determines
+ *	whether speed down is necessary.  Speed down is necessary if
+ *	there have been more than 3 of Cat-1 errors or 10 of Cat-2
+ *	errors during last 15 minutes.
+ *
+ *	Cat-1 errors are ATA_BUS, TIMEOUT for any command and HSM
+ *	violation for known supported commands.
+ *
+ *	Cat-2 errors are unclassified DEV error for known supported
+ *	command.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ *
+ *	RETURNS:
+ *	1 if speed down is necessary, 0 otherwise
+ */
+static int ata_eh_speed_down_needed(struct ata_device *dev)
+{
+	const u64 interval = 15LLU * 60 * HZ;
+	static const int err_limits[3] = { -1, 3, 10 };
+	struct speed_down_needed_arg arg;
+	struct ata_ering_entry *ent;
+	int err_cat;
+	u64 j64;
+
+	ent = ata_ering_top(&dev->ering);
+	if (!ent)
+		return 0;
+
+	err_cat = ata_eh_categorize_ering_entry(ent);
+	if (err_cat == 0)
+		return 0;
+
+	memset(&arg, 0, sizeof(arg));
+
+	j64 = get_jiffies_64();
+	if (j64 >= interval)
+		arg.since = j64 - interval;
+	else
+		arg.since = 0;
+
+	ata_ering_map(&dev->ering, speed_down_needed_cb, &arg);
+
+	return arg.nr_errors[err_cat] > err_limits[err_cat];
+}
+
+/**
+ *	ata_eh_speed_down - record error and speed down if necessary
+ *	@dev: Failed device
+ *	@is_io: Did the device fail during normal IO?
+ *	@err_mask: err_mask of the error
+ *
+ *	Record error and examine error history to determine whether
+ *	adjusting transmission speed is necessary.  It also sets
+ *	transmission limits appropriately if such adjustment is
+ *	necessary.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise
+ */
+static int ata_eh_speed_down(struct ata_device *dev, int is_io,
+			     unsigned int err_mask)
+{
+	if (!err_mask)
+		return 0;
+
+	/* record error and determine whether speed down is necessary */
+	ata_ering_record(&dev->ering, is_io, err_mask);
+
+	if (!ata_eh_speed_down_needed(dev))
+		return 0;
+
+	/* speed down SATA link speed if possible */
+	if (sata_down_spd_limit(dev->ap) == 0)
+		return ATA_EH_HARDRESET;
+
+	/* lower transfer mode */
+	if (ata_down_xfermask_limit(dev, 0) == 0)
+		return ATA_EH_SOFTRESET;
+
+	ata_dev_printk(dev, KERN_ERR,
+		       "speed down requested but no transfer mode left\n");
+	return 0;
+}
+
+/**
+ *	ata_eh_autopsy - analyze error and determine recovery action
+ *	@ap: ATA port to perform autopsy on
+ *
+ *	Analyze why @ap failed and determine which recovery action is
+ *	needed.  This function also sets more detailed AC_ERR_* values
+ *	and fills sense data for ATAPI CHECK SENSE.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+static void ata_eh_autopsy(struct ata_port *ap)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+	unsigned int all_err_mask = 0;
+	int tag, is_io = 0;
+	u32 serror;
+	int rc;
+
+	DPRINTK("ENTER\n");
+
+	if (ehc->i.flags & ATA_EHI_NO_AUTOPSY)
+		return;
+
+	/* obtain and analyze SError */
+	rc = sata_scr_read(ap, SCR_ERROR, &serror);
+	if (rc == 0) {
+		ehc->i.serror |= serror;
+		ata_eh_analyze_serror(ap);
+	} else if (rc != -EOPNOTSUPP)
+		ehc->i.action |= ATA_EH_HARDRESET;
+
+	/* analyze NCQ failure */
+	ata_eh_analyze_ncq_error(ap);
+
+	/* any real error trumps AC_ERR_OTHER */
+	if (ehc->i.err_mask & ~AC_ERR_OTHER)
+		ehc->i.err_mask &= ~AC_ERR_OTHER;
+
+	all_err_mask |= ehc->i.err_mask;
+
+	for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
+		struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
+
+		if (!(qc->flags & ATA_QCFLAG_FAILED))
+			continue;
+
+		/* inherit upper level err_mask */
+		qc->err_mask |= ehc->i.err_mask;
+
+		/* analyze TF */
+		ehc->i.action |= ata_eh_analyze_tf(qc, &qc->result_tf);
+
+		/* DEV errors are probably spurious in case of ATA_BUS error */
+		if (qc->err_mask & AC_ERR_ATA_BUS)
+			qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_MEDIA |
+					  AC_ERR_INVALID);
+
+		/* any real error trumps unknown error */
+		if (qc->err_mask & ~AC_ERR_OTHER)
+			qc->err_mask &= ~AC_ERR_OTHER;
+
+		/* SENSE_VALID trumps dev/unknown error and revalidation */
+		if (qc->flags & ATA_QCFLAG_SENSE_VALID) {
+			qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_OTHER);
+			ehc->i.action &= ~ATA_EH_REVALIDATE;
+		}
+
+		/* accumulate error info */
+		ehc->i.dev = qc->dev;
+		all_err_mask |= qc->err_mask;
+		if (qc->flags & ATA_QCFLAG_IO)
+			is_io = 1;
+	}
+
+	/* enforce default EH actions */
+	if (ap->pflags & ATA_PFLAG_FROZEN ||
+	    all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT))
+		ehc->i.action |= ATA_EH_SOFTRESET;
+	else if (all_err_mask)
+		ehc->i.action |= ATA_EH_REVALIDATE;
+
+	/* if we have offending qcs and the associated failed device */
+	if (ehc->i.dev) {
+		/* speed down */
+		ehc->i.action |= ata_eh_speed_down(ehc->i.dev, is_io,
+						   all_err_mask);
+
+		/* perform per-dev EH action only on the offending device */
+		ehc->i.dev_action[ehc->i.dev->devno] |=
+			ehc->i.action & ATA_EH_PERDEV_MASK;
+		ehc->i.action &= ~ATA_EH_PERDEV_MASK;
+	}
+
+	DPRINTK("EXIT\n");
+}
+
+/**
+ *	ata_eh_report - report error handling to user
+ *	@ap: ATA port EH is going on
+ *
+ *	Report EH to user.
+ *
+ *	LOCKING:
+ *	None.
+ */
+static void ata_eh_report(struct ata_port *ap)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+	const char *frozen, *desc;
+	int tag, nr_failed = 0;
+
+	desc = NULL;
+	if (ehc->i.desc[0] != '\0')
+		desc = ehc->i.desc;
+
+	for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
+		struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
+
+		if (!(qc->flags & ATA_QCFLAG_FAILED))
+			continue;
+		if (qc->flags & ATA_QCFLAG_SENSE_VALID && !qc->err_mask)
+			continue;
+
+		nr_failed++;
+	}
+
+	if (!nr_failed && !ehc->i.err_mask)
+		return;
+
+	frozen = "";
+	if (ap->pflags & ATA_PFLAG_FROZEN)
+		frozen = " frozen";
+
+	if (ehc->i.dev) {
+		ata_dev_printk(ehc->i.dev, KERN_ERR, "exception Emask 0x%x "
+			       "SAct 0x%x SErr 0x%x action 0x%x%s\n",
+			       ehc->i.err_mask, ap->sactive, ehc->i.serror,
+			       ehc->i.action, frozen);
+		if (desc)
+			ata_dev_printk(ehc->i.dev, KERN_ERR, "(%s)\n", desc);
+	} else {
+		ata_port_printk(ap, KERN_ERR, "exception Emask 0x%x "
+				"SAct 0x%x SErr 0x%x action 0x%x%s\n",
+				ehc->i.err_mask, ap->sactive, ehc->i.serror,
+				ehc->i.action, frozen);
+		if (desc)
+			ata_port_printk(ap, KERN_ERR, "(%s)\n", desc);
+	}
+
+	for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
+		struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
+
+		if (!(qc->flags & ATA_QCFLAG_FAILED) || !qc->err_mask)
+			continue;
+
+		ata_dev_printk(qc->dev, KERN_ERR, "tag %d cmd 0x%x "
+			       "Emask 0x%x stat 0x%x err 0x%x (%s)\n",
+			       qc->tag, qc->tf.command, qc->err_mask,
+			       qc->result_tf.command, qc->result_tf.feature,
+			       ata_err_string(qc->err_mask));
+	}
+}
+
+static int ata_do_reset(struct ata_port *ap, ata_reset_fn_t reset,
+			unsigned int *classes)
+{
+	int i, rc;
+
+	for (i = 0; i < ATA_MAX_DEVICES; i++)
+		classes[i] = ATA_DEV_UNKNOWN;
+
+	rc = reset(ap, classes);
+	if (rc)
+		return rc;
+
+	/* If any class isn't ATA_DEV_UNKNOWN, consider classification
+	 * is complete and convert all ATA_DEV_UNKNOWN to
+	 * ATA_DEV_NONE.
+	 */
+	for (i = 0; i < ATA_MAX_DEVICES; i++)
+		if (classes[i] != ATA_DEV_UNKNOWN)
+			break;
+
+	if (i < ATA_MAX_DEVICES)
+		for (i = 0; i < ATA_MAX_DEVICES; i++)
+			if (classes[i] == ATA_DEV_UNKNOWN)
+				classes[i] = ATA_DEV_NONE;
+
+	return 0;
+}
+
+static int ata_eh_followup_srst_needed(int rc, int classify,
+				       const unsigned int *classes)
+{
+	if (rc == -EAGAIN)
+		return 1;
+	if (rc != 0)
+		return 0;
+	if (classify && classes[0] == ATA_DEV_UNKNOWN)
+		return 1;
+	return 0;
+}
+
+static int ata_eh_reset(struct ata_port *ap, int classify,
+			ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
+			ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+	unsigned int *classes = ehc->classes;
+	int tries = ATA_EH_RESET_TRIES;
+	int verbose = !(ehc->i.flags & ATA_EHI_QUIET);
+	unsigned int action;
+	ata_reset_fn_t reset;
+	int i, did_followup_srst, rc;
+
+	/* about to reset */
+	ata_eh_about_to_do(ap, NULL, ehc->i.action & ATA_EH_RESET_MASK);
+
+	/* Determine which reset to use and record in ehc->i.action.
+	 * prereset() may examine and modify it.
+	 */
+	action = ehc->i.action;
+	ehc->i.action &= ~ATA_EH_RESET_MASK;
+	if (softreset && (!hardreset || (!sata_set_spd_needed(ap) &&
+					 !(action & ATA_EH_HARDRESET))))
+		ehc->i.action |= ATA_EH_SOFTRESET;
+	else
+		ehc->i.action |= ATA_EH_HARDRESET;
+
+	if (prereset) {
+		rc = prereset(ap);
+		if (rc) {
+			ata_port_printk(ap, KERN_ERR,
+					"prereset failed (errno=%d)\n", rc);
+			return rc;
+		}
+	}
+
+	/* prereset() might have modified ehc->i.action */
+	if (ehc->i.action & ATA_EH_HARDRESET)
+		reset = hardreset;
+	else if (ehc->i.action & ATA_EH_SOFTRESET)
+		reset = softreset;
+	else {
+		/* prereset told us not to reset, bang classes and return */
+		for (i = 0; i < ATA_MAX_DEVICES; i++)
+			classes[i] = ATA_DEV_NONE;
+		return 0;
+	}
+
+	/* did prereset() screw up?  if so, fix up to avoid oopsing */
+	if (!reset) {
+		ata_port_printk(ap, KERN_ERR, "BUG: prereset() requested "
+				"invalid reset type\n");
+		if (softreset)
+			reset = softreset;
+		else
+			reset = hardreset;
+	}
+
+ retry:
+	/* shut up during boot probing */
+	if (verbose)
+		ata_port_printk(ap, KERN_INFO, "%s resetting port\n",
+				reset == softreset ? "soft" : "hard");
+
+	/* mark that this EH session started with reset */
+	ehc->i.flags |= ATA_EHI_DID_RESET;
+
+	rc = ata_do_reset(ap, reset, classes);
+
+	did_followup_srst = 0;
+	if (reset == hardreset &&
+	    ata_eh_followup_srst_needed(rc, classify, classes)) {
+		/* okay, let's do follow-up softreset */
+		did_followup_srst = 1;
+		reset = softreset;
+
+		if (!reset) {
+			ata_port_printk(ap, KERN_ERR,
+					"follow-up softreset required "
+					"but no softreset avaliable\n");
+			return -EINVAL;
+		}
+
+		ata_eh_about_to_do(ap, NULL, ATA_EH_RESET_MASK);
+		rc = ata_do_reset(ap, reset, classes);
+
+		if (rc == 0 && classify &&
+		    classes[0] == ATA_DEV_UNKNOWN) {
+			ata_port_printk(ap, KERN_ERR,
+					"classification failed\n");
+			return -EINVAL;
+		}
+	}
+
+	if (rc && --tries) {
+		const char *type;
+
+		if (reset == softreset) {
+			if (did_followup_srst)
+				type = "follow-up soft";
+			else
+				type = "soft";
+		} else
+			type = "hard";
+
+		ata_port_printk(ap, KERN_WARNING,
+				"%sreset failed, retrying in 5 secs\n", type);
+		ssleep(5);
+
+		if (reset == hardreset)
+			sata_down_spd_limit(ap);
+		if (hardreset)
+			reset = hardreset;
+		goto retry;
+	}
+
+	if (rc == 0) {
+		/* After the reset, the device state is PIO 0 and the
+		 * controller state is undefined.  Record the mode.
+		 */
+		for (i = 0; i < ATA_MAX_DEVICES; i++)
+			ap->device[i].pio_mode = XFER_PIO_0;
+
+		if (postreset)
+			postreset(ap, classes);
+
+		/* reset successful, schedule revalidation */
+		ata_eh_done(ap, NULL, ehc->i.action & ATA_EH_RESET_MASK);
+		ehc->i.action |= ATA_EH_REVALIDATE;
+	}
+
+	return rc;
+}
+
+static int ata_eh_revalidate_and_attach(struct ata_port *ap,
+					struct ata_device **r_failed_dev)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+	struct ata_device *dev;
+	unsigned long flags;
+	int i, rc = 0;
+
+	DPRINTK("ENTER\n");
+
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		unsigned int action;
+
+		dev = &ap->device[i];
+		action = ata_eh_dev_action(dev);
+
+		if (action & ATA_EH_REVALIDATE && ata_dev_ready(dev)) {
+			if (ata_port_offline(ap)) {
+				rc = -EIO;
+				break;
+			}
+
+			ata_eh_about_to_do(ap, dev, ATA_EH_REVALIDATE);
+			rc = ata_dev_revalidate(dev,
+					ehc->i.flags & ATA_EHI_DID_RESET);
+			if (rc)
+				break;
+
+			ata_eh_done(ap, dev, ATA_EH_REVALIDATE);
+
+			/* schedule the scsi_rescan_device() here */
+			queue_work(ata_aux_wq, &(ap->scsi_rescan_task));
+		} else if (dev->class == ATA_DEV_UNKNOWN &&
+			   ehc->tries[dev->devno] &&
+			   ata_class_enabled(ehc->classes[dev->devno])) {
+			dev->class = ehc->classes[dev->devno];
+
+			rc = ata_dev_read_id(dev, &dev->class, 1, dev->id);
+			if (rc == 0)
+				rc = ata_dev_configure(dev, 1);
+
+			if (rc) {
+				dev->class = ATA_DEV_UNKNOWN;
+				break;
+			}
+
+			spin_lock_irqsave(ap->lock, flags);
+			ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG;
+			spin_unlock_irqrestore(ap->lock, flags);
+		}
+	}
+
+	if (rc)
+		*r_failed_dev = dev;
+
+	DPRINTK("EXIT\n");
+	return rc;
+}
+
+/**
+ *	ata_eh_suspend - handle suspend EH action
+ *	@ap: target host port
+ *	@r_failed_dev: result parameter to indicate failing device
+ *
+ *	Handle suspend EH action.  Disk devices are spinned down and
+ *	other types of devices are just marked suspended.  Once
+ *	suspended, no EH action to the device is allowed until it is
+ *	resumed.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise
+ */
+static int ata_eh_suspend(struct ata_port *ap, struct ata_device **r_failed_dev)
+{
+	struct ata_device *dev;
+	int i, rc = 0;
+
+	DPRINTK("ENTER\n");
+
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		unsigned long flags;
+		unsigned int action, err_mask;
+
+		dev = &ap->device[i];
+		action = ata_eh_dev_action(dev);
+
+		if (!ata_dev_enabled(dev) || !(action & ATA_EH_SUSPEND))
+			continue;
+
+		WARN_ON(dev->flags & ATA_DFLAG_SUSPENDED);
+
+		ata_eh_about_to_do(ap, dev, ATA_EH_SUSPEND);
+
+		if (dev->class == ATA_DEV_ATA && !(action & ATA_EH_PM_FREEZE)) {
+			/* flush cache */
+			rc = ata_flush_cache(dev);
+			if (rc)
+				break;
+
+			/* spin down */
+			err_mask = ata_do_simple_cmd(dev, ATA_CMD_STANDBYNOW1);
+			if (err_mask) {
+				ata_dev_printk(dev, KERN_ERR, "failed to "
+					       "spin down (err_mask=0x%x)\n",
+					       err_mask);
+				rc = -EIO;
+				break;
+			}
+		}
+
+		spin_lock_irqsave(ap->lock, flags);
+		dev->flags |= ATA_DFLAG_SUSPENDED;
+		spin_unlock_irqrestore(ap->lock, flags);
+
+		ata_eh_done(ap, dev, ATA_EH_SUSPEND);
+	}
+
+	if (rc)
+		*r_failed_dev = dev;
+
+	DPRINTK("EXIT\n");
+	return 0;
+}
+
+/**
+ *	ata_eh_prep_resume - prep for resume EH action
+ *	@ap: target host port
+ *
+ *	Clear SUSPENDED in preparation for scheduled resume actions.
+ *	This allows other parts of EH to access the devices being
+ *	resumed.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+static void ata_eh_prep_resume(struct ata_port *ap)
+{
+	struct ata_device *dev;
+	unsigned long flags;
+	int i;
+
+	DPRINTK("ENTER\n");
+
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		unsigned int action;
+
+		dev = &ap->device[i];
+		action = ata_eh_dev_action(dev);
+
+		if (!ata_dev_enabled(dev) || !(action & ATA_EH_RESUME))
+			continue;
+
+		spin_lock_irqsave(ap->lock, flags);
+		dev->flags &= ~ATA_DFLAG_SUSPENDED;
+		spin_unlock_irqrestore(ap->lock, flags);
+	}
+
+	DPRINTK("EXIT\n");
+}
+
+/**
+ *	ata_eh_resume - handle resume EH action
+ *	@ap: target host port
+ *	@r_failed_dev: result parameter to indicate failing device
+ *
+ *	Handle resume EH action.  Target devices are already reset and
+ *	revalidated.  Spinning up is the only operation left.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise
+ */
+static int ata_eh_resume(struct ata_port *ap, struct ata_device **r_failed_dev)
+{
+	struct ata_device *dev;
+	int i, rc = 0;
+
+	DPRINTK("ENTER\n");
+
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		unsigned int action, err_mask;
+
+		dev = &ap->device[i];
+		action = ata_eh_dev_action(dev);
+
+		if (!ata_dev_enabled(dev) || !(action & ATA_EH_RESUME))
+			continue;
+
+		ata_eh_about_to_do(ap, dev, ATA_EH_RESUME);
+
+		if (dev->class == ATA_DEV_ATA && !(action & ATA_EH_PM_FREEZE)) {
+			err_mask = ata_do_simple_cmd(dev,
+						     ATA_CMD_IDLEIMMEDIATE);
+			if (err_mask) {
+				ata_dev_printk(dev, KERN_ERR, "failed to "
+					       "spin up (err_mask=0x%x)\n",
+					       err_mask);
+				rc = -EIO;
+				break;
+			}
+		}
+
+		ata_eh_done(ap, dev, ATA_EH_RESUME);
+	}
+
+	if (rc)
+		*r_failed_dev = dev;
+
+	DPRINTK("EXIT\n");
+	return 0;
+}
+
+static int ata_port_nr_enabled(struct ata_port *ap)
+{
+	int i, cnt = 0;
+
+	for (i = 0; i < ATA_MAX_DEVICES; i++)
+		if (ata_dev_enabled(&ap->device[i]))
+			cnt++;
+	return cnt;
+}
+
+static int ata_port_nr_vacant(struct ata_port *ap)
+{
+	int i, cnt = 0;
+
+	for (i = 0; i < ATA_MAX_DEVICES; i++)
+		if (ap->device[i].class == ATA_DEV_UNKNOWN)
+			cnt++;
+	return cnt;
+}
+
+static int ata_eh_skip_recovery(struct ata_port *ap)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+	int i;
+
+	/* skip if all possible devices are suspended */
+	for (i = 0; i < ata_port_max_devices(ap); i++) {
+		struct ata_device *dev = &ap->device[i];
+
+		if (!(dev->flags & ATA_DFLAG_SUSPENDED))
+			break;
+	}
+
+	if (i == ata_port_max_devices(ap))
+		return 1;
+
+	/* thaw frozen port, resume link and recover failed devices */
+	if ((ap->pflags & ATA_PFLAG_FROZEN) ||
+	    (ehc->i.flags & ATA_EHI_RESUME_LINK) || ata_port_nr_enabled(ap))
+		return 0;
+
+	/* skip if class codes for all vacant slots are ATA_DEV_NONE */
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		struct ata_device *dev = &ap->device[i];
+
+		if (dev->class == ATA_DEV_UNKNOWN &&
+		    ehc->classes[dev->devno] != ATA_DEV_NONE)
+			return 0;
+	}
+
+	return 1;
+}
+
+/**
+ *	ata_eh_recover - recover host port after error
+ *	@ap: host port to recover
+ *	@prereset: prereset method (can be NULL)
+ *	@softreset: softreset method (can be NULL)
+ *	@hardreset: hardreset method (can be NULL)
+ *	@postreset: postreset method (can be NULL)
+ *
+ *	This is the alpha and omega, eum and yang, heart and soul of
+ *	libata exception handling.  On entry, actions required to
+ *	recover the port and hotplug requests are recorded in
+ *	eh_context.  This function executes all the operations with
+ *	appropriate retrials and fallbacks to resurrect failed
+ *	devices, detach goners and greet newcomers.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, -errno on failure.
+ */
+static int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
+			  ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
+			  ata_postreset_fn_t postreset)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+	struct ata_device *dev;
+	int down_xfermask, i, rc;
+
+	DPRINTK("ENTER\n");
+
+	/* prep for recovery */
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		dev = &ap->device[i];
+
+		ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
+
+		/* process hotplug request */
+		if (dev->flags & ATA_DFLAG_DETACH)
+			ata_eh_detach_dev(dev);
+
+		if (!ata_dev_enabled(dev) &&
+		    ((ehc->i.probe_mask & (1 << dev->devno)) &&
+		     !(ehc->did_probe_mask & (1 << dev->devno)))) {
+			ata_eh_detach_dev(dev);
+			ata_dev_init(dev);
+			ehc->did_probe_mask |= (1 << dev->devno);
+			ehc->i.action |= ATA_EH_SOFTRESET;
+		}
+	}
+
+ retry:
+	down_xfermask = 0;
+	rc = 0;
+
+	/* if UNLOADING, finish immediately */
+	if (ap->pflags & ATA_PFLAG_UNLOADING)
+		goto out;
+
+	/* prep for resume */
+	ata_eh_prep_resume(ap);
+
+	/* skip EH if possible. */
+	if (ata_eh_skip_recovery(ap))
+		ehc->i.action = 0;
+
+	for (i = 0; i < ATA_MAX_DEVICES; i++)
+		ehc->classes[i] = ATA_DEV_UNKNOWN;
+
+	/* reset */
+	if (ehc->i.action & ATA_EH_RESET_MASK) {
+		ata_eh_freeze_port(ap);
+
+		rc = ata_eh_reset(ap, ata_port_nr_vacant(ap), prereset,
+				  softreset, hardreset, postreset);
+		if (rc) {
+			ata_port_printk(ap, KERN_ERR,
+					"reset failed, giving up\n");
+			goto out;
+		}
+
+		ata_eh_thaw_port(ap);
+	}
+
+	/* revalidate existing devices and attach new ones */
+	rc = ata_eh_revalidate_and_attach(ap, &dev);
+	if (rc)
+		goto dev_fail;
+
+	/* resume devices */
+	rc = ata_eh_resume(ap, &dev);
+	if (rc)
+		goto dev_fail;
+
+	/* configure transfer mode if the port has been reset */
+	if (ehc->i.flags & ATA_EHI_DID_RESET) {
+		rc = ata_set_mode(ap, &dev);
+		if (rc) {
+			down_xfermask = 1;
+			goto dev_fail;
+		}
+	}
+
+	/* suspend devices */
+	rc = ata_eh_suspend(ap, &dev);
+	if (rc)
+		goto dev_fail;
+
+	goto out;
+
+ dev_fail:
+	switch (rc) {
+	case -ENODEV:
+		/* device missing, schedule probing */
+		ehc->i.probe_mask |= (1 << dev->devno);
+	case -EINVAL:
+		ehc->tries[dev->devno] = 0;
+		break;
+	case -EIO:
+		sata_down_spd_limit(ap);
+	default:
+		ehc->tries[dev->devno]--;
+		if (down_xfermask &&
+		    ata_down_xfermask_limit(dev, ehc->tries[dev->devno] == 1))
+			ehc->tries[dev->devno] = 0;
+	}
+
+	if (ata_dev_enabled(dev) && !ehc->tries[dev->devno]) {
+		/* disable device if it has used up all its chances */
+		ata_dev_disable(dev);
+
+		/* detach if offline */
+		if (ata_port_offline(ap))
+			ata_eh_detach_dev(dev);
+
+		/* probe if requested */
+		if ((ehc->i.probe_mask & (1 << dev->devno)) &&
+		    !(ehc->did_probe_mask & (1 << dev->devno))) {
+			ata_eh_detach_dev(dev);
+			ata_dev_init(dev);
+
+			ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
+			ehc->did_probe_mask |= (1 << dev->devno);
+			ehc->i.action |= ATA_EH_SOFTRESET;
+		}
+	} else {
+		/* soft didn't work?  be haaaaard */
+		if (ehc->i.flags & ATA_EHI_DID_RESET)
+			ehc->i.action |= ATA_EH_HARDRESET;
+		else
+			ehc->i.action |= ATA_EH_SOFTRESET;
+	}
+
+	if (ata_port_nr_enabled(ap)) {
+		ata_port_printk(ap, KERN_WARNING, "failed to recover some "
+				"devices, retrying in 5 secs\n");
+		ssleep(5);
+	} else {
+		/* no device left, repeat fast */
+		msleep(500);
+	}
+
+	goto retry;
+
+ out:
+	if (rc) {
+		for (i = 0; i < ATA_MAX_DEVICES; i++)
+			ata_dev_disable(&ap->device[i]);
+	}
+
+	DPRINTK("EXIT, rc=%d\n", rc);
+	return rc;
+}
+
+/**
+ *	ata_eh_finish - finish up EH
+ *	@ap: host port to finish EH for
+ *
+ *	Recovery is complete.  Clean up EH states and retry or finish
+ *	failed qcs.
+ *
+ *	LOCKING:
+ *	None.
+ */
+static void ata_eh_finish(struct ata_port *ap)
+{
+	int tag;
+
+	/* retry or finish qcs */
+	for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
+		struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
+
+		if (!(qc->flags & ATA_QCFLAG_FAILED))
+			continue;
+
+		if (qc->err_mask) {
+			/* FIXME: Once EH migration is complete,
+			 * generate sense data in this function,
+			 * considering both err_mask and tf.
+			 */
+			if (qc->err_mask & AC_ERR_INVALID)
+				ata_eh_qc_complete(qc);
+			else
+				ata_eh_qc_retry(qc);
+		} else {
+			if (qc->flags & ATA_QCFLAG_SENSE_VALID) {
+				ata_eh_qc_complete(qc);
+			} else {
+				/* feed zero TF to sense generation */
+				memset(&qc->result_tf, 0, sizeof(qc->result_tf));
+				ata_eh_qc_retry(qc);
+			}
+		}
+	}
+}
+
+/**
+ *	ata_do_eh - do standard error handling
+ *	@ap: host port to handle error for
+ *	@prereset: prereset method (can be NULL)
+ *	@softreset: softreset method (can be NULL)
+ *	@hardreset: hardreset method (can be NULL)
+ *	@postreset: postreset method (can be NULL)
+ *
+ *	Perform standard error handling sequence.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
+	       ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
+	       ata_postreset_fn_t postreset)
+{
+	ata_eh_autopsy(ap);
+	ata_eh_report(ap);
+	ata_eh_recover(ap, prereset, softreset, hardreset, postreset);
+	ata_eh_finish(ap);
+}
+
+/**
+ *	ata_eh_handle_port_suspend - perform port suspend operation
+ *	@ap: port to suspend
+ *
+ *	Suspend @ap.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+static void ata_eh_handle_port_suspend(struct ata_port *ap)
+{
+	unsigned long flags;
+	int rc = 0;
+
+	/* are we suspending? */
+	spin_lock_irqsave(ap->lock, flags);
+	if (!(ap->pflags & ATA_PFLAG_PM_PENDING) ||
+	    ap->pm_mesg.event == PM_EVENT_ON) {
+		spin_unlock_irqrestore(ap->lock, flags);
+		return;
+	}
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	WARN_ON(ap->pflags & ATA_PFLAG_SUSPENDED);
+
+	/* suspend */
+	ata_eh_freeze_port(ap);
+
+	if (ap->ops->port_suspend)
+		rc = ap->ops->port_suspend(ap, ap->pm_mesg);
+
+	/* report result */
+	spin_lock_irqsave(ap->lock, flags);
+
+	ap->pflags &= ~ATA_PFLAG_PM_PENDING;
+	if (rc == 0)
+		ap->pflags |= ATA_PFLAG_SUSPENDED;
+	else
+		ata_port_schedule_eh(ap);
+
+	if (ap->pm_result) {
+		*ap->pm_result = rc;
+		ap->pm_result = NULL;
+	}
+
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	return;
+}
+
+/**
+ *	ata_eh_handle_port_resume - perform port resume operation
+ *	@ap: port to resume
+ *
+ *	Resume @ap.
+ *
+ *	This function also waits upto one second until all devices
+ *	hanging off this port requests resume EH action.  This is to
+ *	prevent invoking EH and thus reset multiple times on resume.
+ *
+ *	On DPM resume, where some of devices might not be resumed
+ *	together, this may delay port resume upto one second, but such
+ *	DPM resumes are rare and 1 sec delay isn't too bad.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+static void ata_eh_handle_port_resume(struct ata_port *ap)
+{
+	unsigned long timeout;
+	unsigned long flags;
+	int i, rc = 0;
+
+	/* are we resuming? */
+	spin_lock_irqsave(ap->lock, flags);
+	if (!(ap->pflags & ATA_PFLAG_PM_PENDING) ||
+	    ap->pm_mesg.event != PM_EVENT_ON) {
+		spin_unlock_irqrestore(ap->lock, flags);
+		return;
+	}
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	/* spurious? */
+	if (!(ap->pflags & ATA_PFLAG_SUSPENDED))
+		goto done;
+
+	if (ap->ops->port_resume)
+		rc = ap->ops->port_resume(ap);
+
+	/* give devices time to request EH */
+	timeout = jiffies + HZ; /* 1s max */
+	while (1) {
+		for (i = 0; i < ATA_MAX_DEVICES; i++) {
+			struct ata_device *dev = &ap->device[i];
+			unsigned int action = ata_eh_dev_action(dev);
+
+			if ((dev->flags & ATA_DFLAG_SUSPENDED) &&
+			    !(action & ATA_EH_RESUME))
+				break;
+		}
+
+		if (i == ATA_MAX_DEVICES || time_after(jiffies, timeout))
+			break;
+		msleep(10);
+	}
+
+ done:
+	spin_lock_irqsave(ap->lock, flags);
+	ap->pflags &= ~(ATA_PFLAG_PM_PENDING | ATA_PFLAG_SUSPENDED);
+	if (ap->pm_result) {
+		*ap->pm_result = rc;
+		ap->pm_result = NULL;
+	}
+	spin_unlock_irqrestore(ap->lock, flags);
+}
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
new file mode 100644
index 0000000..d168e34
--- /dev/null
+++ b/drivers/ata/libata-scsi.c
@@ -0,0 +1,3322 @@
+/*
+ *  libata-scsi.c - helper library for ATA
+ *
+ *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
+ *    		    Please ALWAYS copy linux-ide@vger.kernel.org
+ *		    on emails.
+ *
+ *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
+ *  Copyright 2003-2004 Jeff Garzik
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ *  libata documentation is available via 'make {ps|pdf}docs',
+ *  as Documentation/DocBook/libata.*
+ *
+ *  Hardware documentation available from
+ *  - http://www.t10.org/
+ *  - http://www.t13.org/
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/blkdev.h>
+#include <linux/spinlock.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi_transport.h>
+#include <linux/libata.h>
+#include <linux/hdreg.h>
+#include <asm/uaccess.h>
+
+#include "libata.h"
+
+#define SECTOR_SIZE	512
+
+typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc, const u8 *scsicmd);
+
+static struct ata_device * __ata_scsi_find_dev(struct ata_port *ap,
+					const struct scsi_device *scsidev);
+static struct ata_device * ata_scsi_find_dev(struct ata_port *ap,
+					    const struct scsi_device *scsidev);
+static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
+			      unsigned int id, unsigned int lun);
+
+
+#define RW_RECOVERY_MPAGE 0x1
+#define RW_RECOVERY_MPAGE_LEN 12
+#define CACHE_MPAGE 0x8
+#define CACHE_MPAGE_LEN 20
+#define CONTROL_MPAGE 0xa
+#define CONTROL_MPAGE_LEN 12
+#define ALL_MPAGES 0x3f
+#define ALL_SUB_MPAGES 0xff
+
+
+static const u8 def_rw_recovery_mpage[] = {
+	RW_RECOVERY_MPAGE,
+	RW_RECOVERY_MPAGE_LEN - 2,
+	(1 << 7) |	/* AWRE, sat-r06 say it shall be 0 */
+	    (1 << 6),	/* ARRE (auto read reallocation) */
+	0,		/* read retry count */
+	0, 0, 0, 0,
+	0,		/* write retry count */
+	0, 0, 0
+};
+
+static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
+	CACHE_MPAGE,
+	CACHE_MPAGE_LEN - 2,
+	0,		/* contains WCE, needs to be 0 for logic */
+	0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0,		/* contains DRA, needs to be 0 for logic */
+	0, 0, 0, 0, 0, 0, 0
+};
+
+static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
+	CONTROL_MPAGE,
+	CONTROL_MPAGE_LEN - 2,
+	2,	/* DSENSE=0, GLTSD=1 */
+	0,	/* [QAM+QERR may be 1, see 05-359r1] */
+	0, 0, 0, 0, 0xff, 0xff,
+	0, 30	/* extended self test time, see 05-359r1 */
+};
+
+/*
+ * libata transport template.  libata doesn't do real transport stuff.
+ * It just needs the eh_timed_out hook.
+ */
+struct scsi_transport_template ata_scsi_transport_template = {
+	.eh_strategy_handler	= ata_scsi_error,
+	.eh_timed_out		= ata_scsi_timed_out,
+	.user_scan		= ata_scsi_user_scan,
+};
+
+
+static void ata_scsi_invalid_field(struct scsi_cmnd *cmd,
+				   void (*done)(struct scsi_cmnd *))
+{
+	ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
+	/* "Invalid field in cbd" */
+	done(cmd);
+}
+
+/**
+ *	ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
+ *	@sdev: SCSI device for which BIOS geometry is to be determined
+ *	@bdev: block device associated with @sdev
+ *	@capacity: capacity of SCSI device
+ *	@geom: location to which geometry will be output
+ *
+ *	Generic bios head/sector/cylinder calculator
+ *	used by sd. Most BIOSes nowadays expect a XXX/255/16  (CHS)
+ *	mapping. Some situations may arise where the disk is not
+ *	bootable if this is not used.
+ *
+ *	LOCKING:
+ *	Defined by the SCSI layer.  We don't really care.
+ *
+ *	RETURNS:
+ *	Zero.
+ */
+int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
+		       sector_t capacity, int geom[])
+{
+	geom[0] = 255;
+	geom[1] = 63;
+	sector_div(capacity, 255*63);
+	geom[2] = capacity;
+
+	return 0;
+}
+
+/**
+ *	ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
+ *	@scsidev: Device to which we are issuing command
+ *	@arg: User provided data for issuing command
+ *
+ *	LOCKING:
+ *	Defined by the SCSI layer.  We don't really care.
+ *
+ *	RETURNS:
+ *	Zero on success, negative errno on error.
+ */
+
+int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
+{
+	int rc = 0;
+	u8 scsi_cmd[MAX_COMMAND_SIZE];
+	u8 args[4], *argbuf = NULL;
+	int argsize = 0;
+	struct scsi_sense_hdr sshdr;
+	enum dma_data_direction data_dir;
+
+	if (arg == NULL)
+		return -EINVAL;
+
+	if (copy_from_user(args, arg, sizeof(args)))
+		return -EFAULT;
+
+	memset(scsi_cmd, 0, sizeof(scsi_cmd));
+
+	if (args[3]) {
+		argsize = SECTOR_SIZE * args[3];
+		argbuf = kmalloc(argsize, GFP_KERNEL);
+		if (argbuf == NULL) {
+			rc = -ENOMEM;
+			goto error;
+		}
+
+		scsi_cmd[1]  = (4 << 1); /* PIO Data-in */
+		scsi_cmd[2]  = 0x0e;     /* no off.line or cc, read from dev,
+		                            block count in sector count field */
+		data_dir = DMA_FROM_DEVICE;
+	} else {
+		scsi_cmd[1]  = (3 << 1); /* Non-data */
+		/* scsi_cmd[2] is already 0 -- no off.line, cc, or data xfer */
+		data_dir = DMA_NONE;
+	}
+
+	scsi_cmd[0] = ATA_16;
+
+	scsi_cmd[4] = args[2];
+	if (args[0] == WIN_SMART) { /* hack -- ide driver does this too... */
+		scsi_cmd[6]  = args[3];
+		scsi_cmd[8]  = args[1];
+		scsi_cmd[10] = 0x4f;
+		scsi_cmd[12] = 0xc2;
+	} else {
+		scsi_cmd[6]  = args[1];
+	}
+	scsi_cmd[14] = args[0];
+
+	/* Good values for timeout and retries?  Values below
+	   from scsi_ioctl_send_command() for default case... */
+	if (scsi_execute_req(scsidev, scsi_cmd, data_dir, argbuf, argsize,
+			     &sshdr, (10*HZ), 5)) {
+		rc = -EIO;
+		goto error;
+	}
+
+	/* Need code to retrieve data from check condition? */
+
+	if ((argbuf)
+	 && copy_to_user(arg + sizeof(args), argbuf, argsize))
+		rc = -EFAULT;
+error:
+	kfree(argbuf);
+	return rc;
+}
+
+/**
+ *	ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
+ *	@scsidev: Device to which we are issuing command
+ *	@arg: User provided data for issuing command
+ *
+ *	LOCKING:
+ *	Defined by the SCSI layer.  We don't really care.
+ *
+ *	RETURNS:
+ *	Zero on success, negative errno on error.
+ */
+int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
+{
+	int rc = 0;
+	u8 scsi_cmd[MAX_COMMAND_SIZE];
+	u8 args[7];
+	struct scsi_sense_hdr sshdr;
+
+	if (arg == NULL)
+		return -EINVAL;
+
+	if (copy_from_user(args, arg, sizeof(args)))
+		return -EFAULT;
+
+	memset(scsi_cmd, 0, sizeof(scsi_cmd));
+	scsi_cmd[0]  = ATA_16;
+	scsi_cmd[1]  = (3 << 1); /* Non-data */
+	/* scsi_cmd[2] is already 0 -- no off.line, cc, or data xfer */
+	scsi_cmd[4]  = args[1];
+	scsi_cmd[6]  = args[2];
+	scsi_cmd[8]  = args[3];
+	scsi_cmd[10] = args[4];
+	scsi_cmd[12] = args[5];
+	scsi_cmd[14] = args[0];
+
+	/* Good values for timeout and retries?  Values below
+	   from scsi_ioctl_send_command() for default case... */
+	if (scsi_execute_req(scsidev, scsi_cmd, DMA_NONE, NULL, 0, &sshdr,
+			     (10*HZ), 5))
+		rc = -EIO;
+
+	/* Need code to retrieve data from check condition? */
+	return rc;
+}
+
+int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
+{
+	int val = -EINVAL, rc = -EINVAL;
+
+	switch (cmd) {
+	case ATA_IOC_GET_IO32:
+		val = 0;
+		if (copy_to_user(arg, &val, 1))
+			return -EFAULT;
+		return 0;
+
+	case ATA_IOC_SET_IO32:
+		val = (unsigned long) arg;
+		if (val != 0)
+			return -EINVAL;
+		return 0;
+
+	case HDIO_DRIVE_CMD:
+		if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
+			return -EACCES;
+		return ata_cmd_ioctl(scsidev, arg);
+
+	case HDIO_DRIVE_TASK:
+		if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
+			return -EACCES;
+		return ata_task_ioctl(scsidev, arg);
+
+	default:
+		rc = -ENOTTY;
+		break;
+	}
+
+	return rc;
+}
+
+/**
+ *	ata_scsi_qc_new - acquire new ata_queued_cmd reference
+ *	@dev: ATA device to which the new command is attached
+ *	@cmd: SCSI command that originated this ATA command
+ *	@done: SCSI command completion function
+ *
+ *	Obtain a reference to an unused ata_queued_cmd structure,
+ *	which is the basic libata structure representing a single
+ *	ATA command sent to the hardware.
+ *
+ *	If a command was available, fill in the SCSI-specific
+ *	portions of the structure with information on the
+ *	current command.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	Command allocated, or %NULL if none available.
+ */
+struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
+				       struct scsi_cmnd *cmd,
+				       void (*done)(struct scsi_cmnd *))
+{
+	struct ata_queued_cmd *qc;
+
+	qc = ata_qc_new_init(dev);
+	if (qc) {
+		qc->scsicmd = cmd;
+		qc->scsidone = done;
+
+		if (cmd->use_sg) {
+			qc->__sg = (struct scatterlist *) cmd->request_buffer;
+			qc->n_elem = cmd->use_sg;
+		} else {
+			qc->__sg = &qc->sgent;
+			qc->n_elem = 1;
+		}
+	} else {
+		cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
+		done(cmd);
+	}
+
+	return qc;
+}
+
+/**
+ *	ata_dump_status - user friendly display of error info
+ *	@id: id of the port in question
+ *	@tf: ptr to filled out taskfile
+ *
+ *	Decode and dump the ATA error/status registers for the user so
+ *	that they have some idea what really happened at the non
+ *	make-believe layer.
+ *
+ *	LOCKING:
+ *	inherited from caller
+ */
+void ata_dump_status(unsigned id, struct ata_taskfile *tf)
+{
+	u8 stat = tf->command, err = tf->feature;
+
+	printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
+	if (stat & ATA_BUSY) {
+		printk("Busy }\n");	/* Data is not valid in this case */
+	} else {
+		if (stat & 0x40)	printk("DriveReady ");
+		if (stat & 0x20)	printk("DeviceFault ");
+		if (stat & 0x10)	printk("SeekComplete ");
+		if (stat & 0x08)	printk("DataRequest ");
+		if (stat & 0x04)	printk("CorrectedError ");
+		if (stat & 0x02)	printk("Index ");
+		if (stat & 0x01)	printk("Error ");
+		printk("}\n");
+
+		if (err) {
+			printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
+			if (err & 0x04)		printk("DriveStatusError ");
+			if (err & 0x80) {
+				if (err & 0x04)	printk("BadCRC ");
+				else		printk("Sector ");
+			}
+			if (err & 0x40)		printk("UncorrectableError ");
+			if (err & 0x10)		printk("SectorIdNotFound ");
+			if (err & 0x02)		printk("TrackZeroNotFound ");
+			if (err & 0x01)		printk("AddrMarkNotFound ");
+			printk("}\n");
+		}
+	}
+}
+
+/**
+ *	ata_scsi_device_suspend - suspend ATA device associated with sdev
+ *	@sdev: the SCSI device to suspend
+ *	@mesg: target power management message
+ *
+ *	Request suspend EH action on the ATA device associated with
+ *	@sdev and wait for the operation to complete.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0 on success, -errno otherwise.
+ */
+int ata_scsi_device_suspend(struct scsi_device *sdev, pm_message_t mesg)
+{
+	struct ata_port *ap = ata_shost_to_port(sdev->host);
+	struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
+	unsigned long flags;
+	unsigned int action;
+	int rc = 0;
+
+	if (!dev)
+		goto out;
+
+	spin_lock_irqsave(ap->lock, flags);
+
+	/* wait for the previous resume to complete */
+	while (dev->flags & ATA_DFLAG_SUSPENDED) {
+		spin_unlock_irqrestore(ap->lock, flags);
+		ata_port_wait_eh(ap);
+		spin_lock_irqsave(ap->lock, flags);
+	}
+
+	/* if @sdev is already detached, nothing to do */
+	if (sdev->sdev_state == SDEV_OFFLINE ||
+	    sdev->sdev_state == SDEV_CANCEL || sdev->sdev_state == SDEV_DEL)
+		goto out_unlock;
+
+	/* request suspend */
+	action = ATA_EH_SUSPEND;
+	if (mesg.event != PM_EVENT_SUSPEND)
+		action |= ATA_EH_PM_FREEZE;
+	ap->eh_info.dev_action[dev->devno] |= action;
+	ap->eh_info.flags |= ATA_EHI_QUIET;
+	ata_port_schedule_eh(ap);
+
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	/* wait for EH to do the job */
+	ata_port_wait_eh(ap);
+
+	spin_lock_irqsave(ap->lock, flags);
+
+	/* If @sdev is still attached but the associated ATA device
+	 * isn't suspended, the operation failed.
+	 */
+	if (sdev->sdev_state != SDEV_OFFLINE &&
+	    sdev->sdev_state != SDEV_CANCEL && sdev->sdev_state != SDEV_DEL &&
+	    !(dev->flags & ATA_DFLAG_SUSPENDED))
+		rc = -EIO;
+
+ out_unlock:
+	spin_unlock_irqrestore(ap->lock, flags);
+ out:
+	if (rc == 0)
+		sdev->sdev_gendev.power.power_state = mesg;
+	return rc;
+}
+
+/**
+ *	ata_scsi_device_resume - resume ATA device associated with sdev
+ *	@sdev: the SCSI device to resume
+ *
+ *	Request resume EH action on the ATA device associated with
+ *	@sdev and return immediately.  This enables parallel
+ *	wakeup/spinup of devices.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ *
+ *	RETURNS:
+ *	0.
+ */
+int ata_scsi_device_resume(struct scsi_device *sdev)
+{
+	struct ata_port *ap = ata_shost_to_port(sdev->host);
+	struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
+	struct ata_eh_info *ehi = &ap->eh_info;
+	unsigned long flags;
+	unsigned int action;
+
+	if (!dev)
+		goto out;
+
+	spin_lock_irqsave(ap->lock, flags);
+
+	/* if @sdev is already detached, nothing to do */
+	if (sdev->sdev_state == SDEV_OFFLINE ||
+	    sdev->sdev_state == SDEV_CANCEL || sdev->sdev_state == SDEV_DEL)
+		goto out_unlock;
+
+	/* request resume */
+	action = ATA_EH_RESUME;
+	if (sdev->sdev_gendev.power.power_state.event == PM_EVENT_SUSPEND)
+		__ata_ehi_hotplugged(ehi);
+	else
+		action |= ATA_EH_PM_FREEZE | ATA_EH_SOFTRESET;
+	ehi->dev_action[dev->devno] |= action;
+
+	/* We don't want autopsy and verbose EH messages.  Disable
+	 * those if we're the only device on this link.
+	 */
+	if (ata_port_max_devices(ap) == 1)
+		ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
+
+	ata_port_schedule_eh(ap);
+
+ out_unlock:
+	spin_unlock_irqrestore(ap->lock, flags);
+ out:
+	sdev->sdev_gendev.power.power_state = PMSG_ON;
+	return 0;
+}
+
+/**
+ *	ata_to_sense_error - convert ATA error to SCSI error
+ *	@id: ATA device number
+ *	@drv_stat: value contained in ATA status register
+ *	@drv_err: value contained in ATA error register
+ *	@sk: the sense key we'll fill out
+ *	@asc: the additional sense code we'll fill out
+ *	@ascq: the additional sense code qualifier we'll fill out
+ *	@verbose: be verbose
+ *
+ *	Converts an ATA error into a SCSI error.  Fill out pointers to
+ *	SK, ASC, and ASCQ bytes for later use in fixed or descriptor
+ *	format sense blocks.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, u8 *asc,
+			u8 *ascq, int verbose)
+{
+	int i;
+
+	/* Based on the 3ware driver translation table */
+	static const unsigned char sense_table[][4] = {
+		/* BBD|ECC|ID|MAR */
+		{0xd1, 		ABORTED_COMMAND, 0x00, 0x00}, 	// Device busy                  Aborted command
+		/* BBD|ECC|ID */
+		{0xd0,  	ABORTED_COMMAND, 0x00, 0x00}, 	// Device busy                  Aborted command
+		/* ECC|MC|MARK */
+		{0x61, 		HARDWARE_ERROR, 0x00, 0x00}, 	// Device fault                 Hardware error
+		/* ICRC|ABRT */		/* NB: ICRC & !ABRT is BBD */
+		{0x84, 		ABORTED_COMMAND, 0x47, 0x00}, 	// Data CRC error               SCSI parity error
+		/* MC|ID|ABRT|TRK0|MARK */
+		{0x37, 		NOT_READY, 0x04, 0x00}, 	// Unit offline                 Not ready
+		/* MCR|MARK */
+		{0x09, 		NOT_READY, 0x04, 0x00}, 	// Unrecovered disk error       Not ready
+		/*  Bad address mark */
+		{0x01, 		MEDIUM_ERROR, 0x13, 0x00}, 	// Address mark not found       Address mark not found for data field
+		/* TRK0 */
+		{0x02, 		HARDWARE_ERROR, 0x00, 0x00}, 	// Track 0 not found		  Hardware error
+		/* Abort & !ICRC */
+		{0x04, 		ABORTED_COMMAND, 0x00, 0x00}, 	// Aborted command              Aborted command
+		/* Media change request */
+		{0x08, 		NOT_READY, 0x04, 0x00}, 	// Media change request	  FIXME: faking offline
+		/* SRV */
+		{0x10, 		ABORTED_COMMAND, 0x14, 0x00}, 	// ID not found                 Recorded entity not found
+		/* Media change */
+		{0x08,  	NOT_READY, 0x04, 0x00}, 	// Media change		  FIXME: faking offline
+		/* ECC */
+		{0x40, 		MEDIUM_ERROR, 0x11, 0x04}, 	// Uncorrectable ECC error      Unrecovered read error
+		/* BBD - block marked bad */
+		{0x80, 		MEDIUM_ERROR, 0x11, 0x04}, 	// Block marked bad		  Medium error, unrecovered read error
+		{0xFF, 0xFF, 0xFF, 0xFF}, // END mark
+	};
+	static const unsigned char stat_table[][4] = {
+		/* Must be first because BUSY means no other bits valid */
+		{0x80, 		ABORTED_COMMAND, 0x47, 0x00},	// Busy, fake parity for now
+		{0x20, 		HARDWARE_ERROR,  0x00, 0x00}, 	// Device fault
+		{0x08, 		ABORTED_COMMAND, 0x47, 0x00},	// Timed out in xfer, fake parity for now
+		{0x04, 		RECOVERED_ERROR, 0x11, 0x00},	// Recovered ECC error	  Medium error, recovered
+		{0xFF, 0xFF, 0xFF, 0xFF}, // END mark
+	};
+
+	/*
+	 *	Is this an error we can process/parse
+	 */
+	if (drv_stat & ATA_BUSY) {
+		drv_err = 0;	/* Ignore the err bits, they're invalid */
+	}
+
+	if (drv_err) {
+		/* Look for drv_err */
+		for (i = 0; sense_table[i][0] != 0xFF; i++) {
+			/* Look for best matches first */
+			if ((sense_table[i][0] & drv_err) ==
+			    sense_table[i][0]) {
+				*sk = sense_table[i][1];
+				*asc = sense_table[i][2];
+				*ascq = sense_table[i][3];
+				goto translate_done;
+			}
+		}
+		/* No immediate match */
+		if (verbose)
+			printk(KERN_WARNING "ata%u: no sense translation for "
+			       "error 0x%02x\n", id, drv_err);
+	}
+
+	/* Fall back to interpreting status bits */
+	for (i = 0; stat_table[i][0] != 0xFF; i++) {
+		if (stat_table[i][0] & drv_stat) {
+			*sk = stat_table[i][1];
+			*asc = stat_table[i][2];
+			*ascq = stat_table[i][3];
+			goto translate_done;
+		}
+	}
+	/* No error?  Undecoded? */
+	if (verbose)
+		printk(KERN_WARNING "ata%u: no sense translation for "
+		       "status: 0x%02x\n", id, drv_stat);
+
+	/* We need a sensible error return here, which is tricky, and one
+	   that won't cause people to do things like return a disk wrongly */
+	*sk = ABORTED_COMMAND;
+	*asc = 0x00;
+	*ascq = 0x00;
+
+ translate_done:
+	if (verbose)
+		printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
+		       "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
+		       id, drv_stat, drv_err, *sk, *asc, *ascq);
+	return;
+}
+
+/*
+ *	ata_gen_ata_desc_sense - Generate check condition sense block.
+ *	@qc: Command that completed.
+ *
+ *	This function is specific to the ATA descriptor format sense
+ *	block specified for the ATA pass through commands.  Regardless
+ *	of whether the command errored or not, return a sense
+ *	block. Copy all controller registers into the sense
+ *	block. Clear sense key, ASC & ASCQ if there is no error.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+void ata_gen_ata_desc_sense(struct ata_queued_cmd *qc)
+{
+	struct scsi_cmnd *cmd = qc->scsicmd;
+	struct ata_taskfile *tf = &qc->result_tf;
+	unsigned char *sb = cmd->sense_buffer;
+	unsigned char *desc = sb + 8;
+	int verbose = qc->ap->ops->error_handler == NULL;
+
+	memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
+
+	cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
+
+	/*
+	 * Use ata_to_sense_error() to map status register bits
+	 * onto sense key, asc & ascq.
+	 */
+	if (qc->err_mask ||
+	    tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
+		ata_to_sense_error(qc->ap->id, tf->command, tf->feature,
+				   &sb[1], &sb[2], &sb[3], verbose);
+		sb[1] &= 0x0f;
+	}
+
+	/*
+	 * Sense data is current and format is descriptor.
+	 */
+	sb[0] = 0x72;
+
+	desc[0] = 0x09;
+
+	/*
+	 * Set length of additional sense data.
+	 * Since we only populate descriptor 0, the total
+	 * length is the same (fixed) length as descriptor 0.
+	 */
+	desc[1] = sb[7] = 14;
+
+	/*
+	 * Copy registers into sense buffer.
+	 */
+	desc[2] = 0x00;
+	desc[3] = tf->feature;	/* == error reg */
+	desc[5] = tf->nsect;
+	desc[7] = tf->lbal;
+	desc[9] = tf->lbam;
+	desc[11] = tf->lbah;
+	desc[12] = tf->device;
+	desc[13] = tf->command; /* == status reg */
+
+	/*
+	 * Fill in Extend bit, and the high order bytes
+	 * if applicable.
+	 */
+	if (tf->flags & ATA_TFLAG_LBA48) {
+		desc[2] |= 0x01;
+		desc[4] = tf->hob_nsect;
+		desc[6] = tf->hob_lbal;
+		desc[8] = tf->hob_lbam;
+		desc[10] = tf->hob_lbah;
+	}
+}
+
+/**
+ *	ata_gen_fixed_sense - generate a SCSI fixed sense block
+ *	@qc: Command that we are erroring out
+ *
+ *	Leverage ata_to_sense_error() to give us the codes.  Fit our
+ *	LBA in here if there's room.
+ *
+ *	LOCKING:
+ *	inherited from caller
+ */
+void ata_gen_fixed_sense(struct ata_queued_cmd *qc)
+{
+	struct scsi_cmnd *cmd = qc->scsicmd;
+	struct ata_taskfile *tf = &qc->result_tf;
+	unsigned char *sb = cmd->sense_buffer;
+	int verbose = qc->ap->ops->error_handler == NULL;
+
+	memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
+
+	cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
+
+	/*
+	 * Use ata_to_sense_error() to map status register bits
+	 * onto sense key, asc & ascq.
+	 */
+	if (qc->err_mask ||
+	    tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
+		ata_to_sense_error(qc->ap->id, tf->command, tf->feature,
+				   &sb[2], &sb[12], &sb[13], verbose);
+		sb[2] &= 0x0f;
+	}
+
+	sb[0] = 0x70;
+	sb[7] = 0x0a;
+
+	if (tf->flags & ATA_TFLAG_LBA48) {
+		/* TODO: find solution for LBA48 descriptors */
+	}
+
+	else if (tf->flags & ATA_TFLAG_LBA) {
+		/* A small (28b) LBA will fit in the 32b info field */
+		sb[0] |= 0x80;		/* set valid bit */
+		sb[3] = tf->device & 0x0f;
+		sb[4] = tf->lbah;
+		sb[5] = tf->lbam;
+		sb[6] = tf->lbal;
+	}
+
+	else {
+		/* TODO: C/H/S */
+	}
+}
+
+static void ata_scsi_sdev_config(struct scsi_device *sdev)
+{
+	sdev->use_10_for_rw = 1;
+	sdev->use_10_for_ms = 1;
+}
+
+static void ata_scsi_dev_config(struct scsi_device *sdev,
+				struct ata_device *dev)
+{
+	unsigned int max_sectors;
+
+	/* TODO: 2048 is an arbitrary number, not the
+	 * hardware maximum.  This should be increased to
+	 * 65534 when Jens Axboe's patch for dynamically
+	 * determining max_sectors is merged.
+	 */
+	max_sectors = ATA_MAX_SECTORS;
+	if (dev->flags & ATA_DFLAG_LBA48)
+		max_sectors = ATA_MAX_SECTORS_LBA48;
+	if (dev->max_sectors)
+		max_sectors = dev->max_sectors;
+
+	blk_queue_max_sectors(sdev->request_queue, max_sectors);
+
+	/*
+	 * SATA DMA transfers must be multiples of 4 byte, so
+	 * we need to pad ATAPI transfers using an extra sg.
+	 * Decrement max hw segments accordingly.
+	 */
+	if (dev->class == ATA_DEV_ATAPI) {
+		request_queue_t *q = sdev->request_queue;
+		blk_queue_max_hw_segments(q, q->max_hw_segments - 1);
+	}
+
+	if (dev->flags & ATA_DFLAG_NCQ) {
+		int depth;
+
+		depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
+		depth = min(ATA_MAX_QUEUE - 1, depth);
+		scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
+	}
+}
+
+/**
+ *	ata_scsi_slave_config - Set SCSI device attributes
+ *	@sdev: SCSI device to examine
+ *
+ *	This is called before we actually start reading
+ *	and writing to the device, to configure certain
+ *	SCSI mid-layer behaviors.
+ *
+ *	LOCKING:
+ *	Defined by SCSI layer.  We don't really care.
+ */
+
+int ata_scsi_slave_config(struct scsi_device *sdev)
+{
+	struct ata_port *ap = ata_shost_to_port(sdev->host);
+	struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
+
+	ata_scsi_sdev_config(sdev);
+
+	blk_queue_max_phys_segments(sdev->request_queue, LIBATA_MAX_PRD);
+
+	if (dev)
+		ata_scsi_dev_config(sdev, dev);
+
+	return 0;	/* scsi layer doesn't check return value, sigh */
+}
+
+/**
+ *	ata_scsi_slave_destroy - SCSI device is about to be destroyed
+ *	@sdev: SCSI device to be destroyed
+ *
+ *	@sdev is about to be destroyed for hot/warm unplugging.  If
+ *	this unplugging was initiated by libata as indicated by NULL
+ *	dev->sdev, this function doesn't have to do anything.
+ *	Otherwise, SCSI layer initiated warm-unplug is in progress.
+ *	Clear dev->sdev, schedule the device for ATA detach and invoke
+ *	EH.
+ *
+ *	LOCKING:
+ *	Defined by SCSI layer.  We don't really care.
+ */
+void ata_scsi_slave_destroy(struct scsi_device *sdev)
+{
+	struct ata_port *ap = ata_shost_to_port(sdev->host);
+	unsigned long flags;
+	struct ata_device *dev;
+
+	if (!ap->ops->error_handler)
+		return;
+
+	spin_lock_irqsave(ap->lock, flags);
+	dev = __ata_scsi_find_dev(ap, sdev);
+	if (dev && dev->sdev) {
+		/* SCSI device already in CANCEL state, no need to offline it */
+		dev->sdev = NULL;
+		dev->flags |= ATA_DFLAG_DETACH;
+		ata_port_schedule_eh(ap);
+	}
+	spin_unlock_irqrestore(ap->lock, flags);
+}
+
+/**
+ *	ata_scsi_change_queue_depth - SCSI callback for queue depth config
+ *	@sdev: SCSI device to configure queue depth for
+ *	@queue_depth: new queue depth
+ *
+ *	This is libata standard hostt->change_queue_depth callback.
+ *	SCSI will call into this callback when user tries to set queue
+ *	depth via sysfs.
+ *
+ *	LOCKING:
+ *	SCSI layer (we don't care)
+ *
+ *	RETURNS:
+ *	Newly configured queue depth.
+ */
+int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
+{
+	struct ata_port *ap = ata_shost_to_port(sdev->host);
+	struct ata_device *dev;
+	int max_depth;
+
+	if (queue_depth < 1)
+		return sdev->queue_depth;
+
+	dev = ata_scsi_find_dev(ap, sdev);
+	if (!dev || !ata_dev_enabled(dev))
+		return sdev->queue_depth;
+
+	max_depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
+	max_depth = min(ATA_MAX_QUEUE - 1, max_depth);
+	if (queue_depth > max_depth)
+		queue_depth = max_depth;
+
+	scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
+	return queue_depth;
+}
+
+/**
+ *	ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
+ *	@qc: Storage for translated ATA taskfile
+ *	@scsicmd: SCSI command to translate
+ *
+ *	Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
+ *	(to start). Perhaps these commands should be preceded by
+ *	CHECK POWER MODE to see what power mode the device is already in.
+ *	[See SAT revision 5 at www.t10.org]
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	Zero on success, non-zero on error.
+ */
+
+static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc,
+					     const u8 *scsicmd)
+{
+	struct ata_taskfile *tf = &qc->tf;
+
+	tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
+	tf->protocol = ATA_PROT_NODATA;
+	if (scsicmd[1] & 0x1) {
+		;	/* ignore IMMED bit, violates sat-r05 */
+	}
+	if (scsicmd[4] & 0x2)
+		goto invalid_fld;       /* LOEJ bit set not supported */
+	if (((scsicmd[4] >> 4) & 0xf) != 0)
+		goto invalid_fld;       /* power conditions not supported */
+	if (scsicmd[4] & 0x1) {
+		tf->nsect = 1;	/* 1 sector, lba=0 */
+
+		if (qc->dev->flags & ATA_DFLAG_LBA) {
+			tf->flags |= ATA_TFLAG_LBA;
+
+			tf->lbah = 0x0;
+			tf->lbam = 0x0;
+			tf->lbal = 0x0;
+			tf->device |= ATA_LBA;
+		} else {
+			/* CHS */
+			tf->lbal = 0x1; /* sect */
+			tf->lbam = 0x0; /* cyl low */
+			tf->lbah = 0x0; /* cyl high */
+		}
+
+		tf->command = ATA_CMD_VERIFY;	/* READ VERIFY */
+	} else {
+		tf->nsect = 0;	/* time period value (0 implies now) */
+		tf->command = ATA_CMD_STANDBY;
+		/* Consider: ATA STANDBY IMMEDIATE command */
+	}
+	/*
+	 * Standby and Idle condition timers could be implemented but that
+	 * would require libata to implement the Power condition mode page
+	 * and allow the user to change it. Changing mode pages requires
+	 * MODE SELECT to be implemented.
+	 */
+
+	return 0;
+
+invalid_fld:
+	ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x0);
+	/* "Invalid field in cbd" */
+	return 1;
+}
+
+
+/**
+ *	ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
+ *	@qc: Storage for translated ATA taskfile
+ *	@scsicmd: SCSI command to translate (ignored)
+ *
+ *	Sets up an ATA taskfile to issue FLUSH CACHE or
+ *	FLUSH CACHE EXT.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	Zero on success, non-zero on error.
+ */
+
+static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
+{
+	struct ata_taskfile *tf = &qc->tf;
+
+	tf->flags |= ATA_TFLAG_DEVICE;
+	tf->protocol = ATA_PROT_NODATA;
+
+	if ((qc->dev->flags & ATA_DFLAG_LBA48) &&
+	    (ata_id_has_flush_ext(qc->dev->id)))
+		tf->command = ATA_CMD_FLUSH_EXT;
+	else
+		tf->command = ATA_CMD_FLUSH;
+
+	return 0;
+}
+
+/**
+ *	scsi_6_lba_len - Get LBA and transfer length
+ *	@scsicmd: SCSI command to translate
+ *
+ *	Calculate LBA and transfer length for 6-byte commands.
+ *
+ *	RETURNS:
+ *	@plba: the LBA
+ *	@plen: the transfer length
+ */
+
+static void scsi_6_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
+{
+	u64 lba = 0;
+	u32 len = 0;
+
+	VPRINTK("six-byte command\n");
+
+	lba |= ((u64)scsicmd[2]) << 8;
+	lba |= ((u64)scsicmd[3]);
+
+	len |= ((u32)scsicmd[4]);
+
+	*plba = lba;
+	*plen = len;
+}
+
+/**
+ *	scsi_10_lba_len - Get LBA and transfer length
+ *	@scsicmd: SCSI command to translate
+ *
+ *	Calculate LBA and transfer length for 10-byte commands.
+ *
+ *	RETURNS:
+ *	@plba: the LBA
+ *	@plen: the transfer length
+ */
+
+static void scsi_10_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
+{
+	u64 lba = 0;
+	u32 len = 0;
+
+	VPRINTK("ten-byte command\n");
+
+	lba |= ((u64)scsicmd[2]) << 24;
+	lba |= ((u64)scsicmd[3]) << 16;
+	lba |= ((u64)scsicmd[4]) << 8;
+	lba |= ((u64)scsicmd[5]);
+
+	len |= ((u32)scsicmd[7]) << 8;
+	len |= ((u32)scsicmd[8]);
+
+	*plba = lba;
+	*plen = len;
+}
+
+/**
+ *	scsi_16_lba_len - Get LBA and transfer length
+ *	@scsicmd: SCSI command to translate
+ *
+ *	Calculate LBA and transfer length for 16-byte commands.
+ *
+ *	RETURNS:
+ *	@plba: the LBA
+ *	@plen: the transfer length
+ */
+
+static void scsi_16_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
+{
+	u64 lba = 0;
+	u32 len = 0;
+
+	VPRINTK("sixteen-byte command\n");
+
+	lba |= ((u64)scsicmd[2]) << 56;
+	lba |= ((u64)scsicmd[3]) << 48;
+	lba |= ((u64)scsicmd[4]) << 40;
+	lba |= ((u64)scsicmd[5]) << 32;
+	lba |= ((u64)scsicmd[6]) << 24;
+	lba |= ((u64)scsicmd[7]) << 16;
+	lba |= ((u64)scsicmd[8]) << 8;
+	lba |= ((u64)scsicmd[9]);
+
+	len |= ((u32)scsicmd[10]) << 24;
+	len |= ((u32)scsicmd[11]) << 16;
+	len |= ((u32)scsicmd[12]) << 8;
+	len |= ((u32)scsicmd[13]);
+
+	*plba = lba;
+	*plen = len;
+}
+
+/**
+ *	ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
+ *	@qc: Storage for translated ATA taskfile
+ *	@scsicmd: SCSI command to translate
+ *
+ *	Converts SCSI VERIFY command to an ATA READ VERIFY command.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	Zero on success, non-zero on error.
+ */
+
+static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
+{
+	struct ata_taskfile *tf = &qc->tf;
+	struct ata_device *dev = qc->dev;
+	u64 dev_sectors = qc->dev->n_sectors;
+	u64 block;
+	u32 n_block;
+
+	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+	tf->protocol = ATA_PROT_NODATA;
+
+	if (scsicmd[0] == VERIFY)
+		scsi_10_lba_len(scsicmd, &block, &n_block);
+	else if (scsicmd[0] == VERIFY_16)
+		scsi_16_lba_len(scsicmd, &block, &n_block);
+	else
+		goto invalid_fld;
+
+	if (!n_block)
+		goto nothing_to_do;
+	if (block >= dev_sectors)
+		goto out_of_range;
+	if ((block + n_block) > dev_sectors)
+		goto out_of_range;
+
+	if (dev->flags & ATA_DFLAG_LBA) {
+		tf->flags |= ATA_TFLAG_LBA;
+
+		if (lba_28_ok(block, n_block)) {
+			/* use LBA28 */
+			tf->command = ATA_CMD_VERIFY;
+			tf->device |= (block >> 24) & 0xf;
+		} else if (lba_48_ok(block, n_block)) {
+			if (!(dev->flags & ATA_DFLAG_LBA48))
+				goto out_of_range;
+
+			/* use LBA48 */
+			tf->flags |= ATA_TFLAG_LBA48;
+			tf->command = ATA_CMD_VERIFY_EXT;
+
+			tf->hob_nsect = (n_block >> 8) & 0xff;
+
+			tf->hob_lbah = (block >> 40) & 0xff;
+			tf->hob_lbam = (block >> 32) & 0xff;
+			tf->hob_lbal = (block >> 24) & 0xff;
+		} else
+			/* request too large even for LBA48 */
+			goto out_of_range;
+
+		tf->nsect = n_block & 0xff;
+
+		tf->lbah = (block >> 16) & 0xff;
+		tf->lbam = (block >> 8) & 0xff;
+		tf->lbal = block & 0xff;
+
+		tf->device |= ATA_LBA;
+	} else {
+		/* CHS */
+		u32 sect, head, cyl, track;
+
+		if (!lba_28_ok(block, n_block))
+			goto out_of_range;
+
+		/* Convert LBA to CHS */
+		track = (u32)block / dev->sectors;
+		cyl   = track / dev->heads;
+		head  = track % dev->heads;
+		sect  = (u32)block % dev->sectors + 1;
+
+		DPRINTK("block %u track %u cyl %u head %u sect %u\n",
+			(u32)block, track, cyl, head, sect);
+
+		/* Check whether the converted CHS can fit.
+		   Cylinder: 0-65535
+		   Head: 0-15
+		   Sector: 1-255*/
+		if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
+			goto out_of_range;
+
+		tf->command = ATA_CMD_VERIFY;
+		tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
+		tf->lbal = sect;
+		tf->lbam = cyl;
+		tf->lbah = cyl >> 8;
+		tf->device |= head;
+	}
+
+	return 0;
+
+invalid_fld:
+	ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x0);
+	/* "Invalid field in cbd" */
+	return 1;
+
+out_of_range:
+	ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x21, 0x0);
+	/* "Logical Block Address out of range" */
+	return 1;
+
+nothing_to_do:
+	qc->scsicmd->result = SAM_STAT_GOOD;
+	return 1;
+}
+
+/**
+ *	ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
+ *	@qc: Storage for translated ATA taskfile
+ *	@scsicmd: SCSI command to translate
+ *
+ *	Converts any of six SCSI read/write commands into the
+ *	ATA counterpart, including starting sector (LBA),
+ *	sector count, and taking into account the device's LBA48
+ *	support.
+ *
+ *	Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
+ *	%WRITE_16 are currently supported.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	Zero on success, non-zero on error.
+ */
+
+static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
+{
+	struct ata_taskfile *tf = &qc->tf;
+	struct ata_device *dev = qc->dev;
+	u64 block;
+	u32 n_block;
+
+	qc->flags |= ATA_QCFLAG_IO;
+	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+
+	if (scsicmd[0] == WRITE_10 || scsicmd[0] == WRITE_6 ||
+	    scsicmd[0] == WRITE_16)
+		tf->flags |= ATA_TFLAG_WRITE;
+
+	/* Calculate the SCSI LBA, transfer length and FUA. */
+	switch (scsicmd[0]) {
+	case READ_10:
+	case WRITE_10:
+		scsi_10_lba_len(scsicmd, &block, &n_block);
+		if (unlikely(scsicmd[1] & (1 << 3)))
+			tf->flags |= ATA_TFLAG_FUA;
+		break;
+	case READ_6:
+	case WRITE_6:
+		scsi_6_lba_len(scsicmd, &block, &n_block);
+
+		/* for 6-byte r/w commands, transfer length 0
+		 * means 256 blocks of data, not 0 block.
+		 */
+		if (!n_block)
+			n_block = 256;
+		break;
+	case READ_16:
+	case WRITE_16:
+		scsi_16_lba_len(scsicmd, &block, &n_block);
+		if (unlikely(scsicmd[1] & (1 << 3)))
+			tf->flags |= ATA_TFLAG_FUA;
+		break;
+	default:
+		DPRINTK("no-byte command\n");
+		goto invalid_fld;
+	}
+
+	/* Check and compose ATA command */
+	if (!n_block)
+		/* For 10-byte and 16-byte SCSI R/W commands, transfer
+		 * length 0 means transfer 0 block of data.
+		 * However, for ATA R/W commands, sector count 0 means
+		 * 256 or 65536 sectors, not 0 sectors as in SCSI.
+		 *
+		 * WARNING: one or two older ATA drives treat 0 as 0...
+		 */
+		goto nothing_to_do;
+
+	if ((dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ)) == ATA_DFLAG_NCQ) {
+		/* yay, NCQ */
+		if (!lba_48_ok(block, n_block))
+			goto out_of_range;
+
+		tf->protocol = ATA_PROT_NCQ;
+		tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
+
+		if (tf->flags & ATA_TFLAG_WRITE)
+			tf->command = ATA_CMD_FPDMA_WRITE;
+		else
+			tf->command = ATA_CMD_FPDMA_READ;
+
+		qc->nsect = n_block;
+
+		tf->nsect = qc->tag << 3;
+		tf->hob_feature = (n_block >> 8) & 0xff;
+		tf->feature = n_block & 0xff;
+
+		tf->hob_lbah = (block >> 40) & 0xff;
+		tf->hob_lbam = (block >> 32) & 0xff;
+		tf->hob_lbal = (block >> 24) & 0xff;
+		tf->lbah = (block >> 16) & 0xff;
+		tf->lbam = (block >> 8) & 0xff;
+		tf->lbal = block & 0xff;
+
+		tf->device = 1 << 6;
+		if (tf->flags & ATA_TFLAG_FUA)
+			tf->device |= 1 << 7;
+	} else if (dev->flags & ATA_DFLAG_LBA) {
+		tf->flags |= ATA_TFLAG_LBA;
+
+		if (lba_28_ok(block, n_block)) {
+			/* use LBA28 */
+			tf->device |= (block >> 24) & 0xf;
+		} else if (lba_48_ok(block, n_block)) {
+			if (!(dev->flags & ATA_DFLAG_LBA48))
+				goto out_of_range;
+
+			/* use LBA48 */
+			tf->flags |= ATA_TFLAG_LBA48;
+
+			tf->hob_nsect = (n_block >> 8) & 0xff;
+
+			tf->hob_lbah = (block >> 40) & 0xff;
+			tf->hob_lbam = (block >> 32) & 0xff;
+			tf->hob_lbal = (block >> 24) & 0xff;
+		} else
+			/* request too large even for LBA48 */
+			goto out_of_range;
+
+		if (unlikely(ata_rwcmd_protocol(qc) < 0))
+			goto invalid_fld;
+
+		qc->nsect = n_block;
+		tf->nsect = n_block & 0xff;
+
+		tf->lbah = (block >> 16) & 0xff;
+		tf->lbam = (block >> 8) & 0xff;
+		tf->lbal = block & 0xff;
+
+		tf->device |= ATA_LBA;
+	} else {
+		/* CHS */
+		u32 sect, head, cyl, track;
+
+		/* The request -may- be too large for CHS addressing. */
+		if (!lba_28_ok(block, n_block))
+			goto out_of_range;
+
+		if (unlikely(ata_rwcmd_protocol(qc) < 0))
+			goto invalid_fld;
+
+		/* Convert LBA to CHS */
+		track = (u32)block / dev->sectors;
+		cyl   = track / dev->heads;
+		head  = track % dev->heads;
+		sect  = (u32)block % dev->sectors + 1;
+
+		DPRINTK("block %u track %u cyl %u head %u sect %u\n",
+			(u32)block, track, cyl, head, sect);
+
+		/* Check whether the converted CHS can fit.
+		   Cylinder: 0-65535
+		   Head: 0-15
+		   Sector: 1-255*/
+		if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
+			goto out_of_range;
+
+		qc->nsect = n_block;
+		tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
+		tf->lbal = sect;
+		tf->lbam = cyl;
+		tf->lbah = cyl >> 8;
+		tf->device |= head;
+	}
+
+	return 0;
+
+invalid_fld:
+	ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x0);
+	/* "Invalid field in cbd" */
+	return 1;
+
+out_of_range:
+	ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x21, 0x0);
+	/* "Logical Block Address out of range" */
+	return 1;
+
+nothing_to_do:
+	qc->scsicmd->result = SAM_STAT_GOOD;
+	return 1;
+}
+
+static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
+{
+	struct scsi_cmnd *cmd = qc->scsicmd;
+	u8 *cdb = cmd->cmnd;
+ 	int need_sense = (qc->err_mask != 0);
+
+	/* We snoop the SET_FEATURES - Write Cache ON/OFF command, and
+	 * schedule EH_REVALIDATE operation to update the IDENTIFY DEVICE
+	 * cache
+	 */
+	if (!need_sense && (qc->tf.command == ATA_CMD_SET_FEATURES) &&
+	    ((qc->tf.feature == SETFEATURES_WC_ON) ||
+	     (qc->tf.feature == SETFEATURES_WC_OFF))) {
+		qc->ap->eh_info.action |= ATA_EH_REVALIDATE;
+		ata_port_schedule_eh(qc->ap);
+	}
+
+	/* For ATA pass thru (SAT) commands, generate a sense block if
+	 * user mandated it or if there's an error.  Note that if we
+	 * generate because the user forced us to, a check condition
+	 * is generated and the ATA register values are returned
+	 * whether the command completed successfully or not. If there
+	 * was no error, SK, ASC and ASCQ will all be zero.
+	 */
+	if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
+ 	    ((cdb[2] & 0x20) || need_sense)) {
+ 		ata_gen_ata_desc_sense(qc);
+	} else {
+		if (!need_sense) {
+			cmd->result = SAM_STAT_GOOD;
+		} else {
+			/* TODO: decide which descriptor format to use
+			 * for 48b LBA devices and call that here
+			 * instead of the fixed desc, which is only
+			 * good for smaller LBA (and maybe CHS?)
+			 * devices.
+			 */
+			ata_gen_fixed_sense(qc);
+		}
+	}
+
+	if (need_sense && !qc->ap->ops->error_handler)
+		ata_dump_status(qc->ap->id, &qc->result_tf);
+
+	qc->scsidone(cmd);
+
+	ata_qc_free(qc);
+}
+
+/**
+ *	ata_scmd_need_defer - Check whether we need to defer scmd
+ *	@dev: ATA device to which the command is addressed
+ *	@is_io: Is the command IO (and thus possibly NCQ)?
+ *
+ *	NCQ and non-NCQ commands cannot run together.  As upper layer
+ *	only knows the queue depth, we are responsible for maintaining
+ *	exclusion.  This function checks whether a new command can be
+ *	issued to @dev.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	1 if deferring is needed, 0 otherwise.
+ */
+static int ata_scmd_need_defer(struct ata_device *dev, int is_io)
+{
+	struct ata_port *ap = dev->ap;
+
+	if (!(dev->flags & ATA_DFLAG_NCQ))
+		return 0;
+
+	if (is_io) {
+		if (!ata_tag_valid(ap->active_tag))
+			return 0;
+	} else {
+		if (!ata_tag_valid(ap->active_tag) && !ap->sactive)
+			return 0;
+	}
+	return 1;
+}
+
+/**
+ *	ata_scsi_translate - Translate then issue SCSI command to ATA device
+ *	@dev: ATA device to which the command is addressed
+ *	@cmd: SCSI command to execute
+ *	@done: SCSI command completion function
+ *	@xlat_func: Actor which translates @cmd to an ATA taskfile
+ *
+ *	Our ->queuecommand() function has decided that the SCSI
+ *	command issued can be directly translated into an ATA
+ *	command, rather than handled internally.
+ *
+ *	This function sets up an ata_queued_cmd structure for the
+ *	SCSI command, and sends that ata_queued_cmd to the hardware.
+ *
+ *	The xlat_func argument (actor) returns 0 if ready to execute
+ *	ATA command, else 1 to finish translation. If 1 is returned
+ *	then cmd->result (and possibly cmd->sense_buffer) are assumed
+ *	to be set reflecting an error condition or clean (early)
+ *	termination.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
+ *	needs to be deferred.
+ */
+static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
+			      void (*done)(struct scsi_cmnd *),
+			      ata_xlat_func_t xlat_func)
+{
+	struct ata_queued_cmd *qc;
+	u8 *scsicmd = cmd->cmnd;
+	int is_io = xlat_func == ata_scsi_rw_xlat;
+
+	VPRINTK("ENTER\n");
+
+	if (unlikely(ata_scmd_need_defer(dev, is_io)))
+		goto defer;
+
+	qc = ata_scsi_qc_new(dev, cmd, done);
+	if (!qc)
+		goto err_mem;
+
+	/* data is present; dma-map it */
+	if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
+	    cmd->sc_data_direction == DMA_TO_DEVICE) {
+		if (unlikely(cmd->request_bufflen < 1)) {
+			ata_dev_printk(dev, KERN_WARNING,
+				       "WARNING: zero len r/w req\n");
+			goto err_did;
+		}
+
+		if (cmd->use_sg)
+			ata_sg_init(qc, cmd->request_buffer, cmd->use_sg);
+		else
+			ata_sg_init_one(qc, cmd->request_buffer,
+					cmd->request_bufflen);
+
+		qc->dma_dir = cmd->sc_data_direction;
+	}
+
+	qc->complete_fn = ata_scsi_qc_complete;
+
+	if (xlat_func(qc, scsicmd))
+		goto early_finish;
+
+	/* select device, send command to hardware */
+	ata_qc_issue(qc);
+
+	VPRINTK("EXIT\n");
+	return 0;
+
+early_finish:
+        ata_qc_free(qc);
+	done(cmd);
+	DPRINTK("EXIT - early finish (good or error)\n");
+	return 0;
+
+err_did:
+	ata_qc_free(qc);
+err_mem:
+	cmd->result = (DID_ERROR << 16);
+	done(cmd);
+	DPRINTK("EXIT - internal\n");
+	return 0;
+
+defer:
+	DPRINTK("EXIT - defer\n");
+	return SCSI_MLQUEUE_DEVICE_BUSY;
+}
+
+/**
+ *	ata_scsi_rbuf_get - Map response buffer.
+ *	@cmd: SCSI command containing buffer to be mapped.
+ *	@buf_out: Pointer to mapped area.
+ *
+ *	Maps buffer contained within SCSI command @cmd.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	Length of response buffer.
+ */
+
+static unsigned int ata_scsi_rbuf_get(struct scsi_cmnd *cmd, u8 **buf_out)
+{
+	u8 *buf;
+	unsigned int buflen;
+
+	if (cmd->use_sg) {
+		struct scatterlist *sg;
+
+		sg = (struct scatterlist *) cmd->request_buffer;
+		buf = kmap_atomic(sg->page, KM_USER0) + sg->offset;
+		buflen = sg->length;
+	} else {
+		buf = cmd->request_buffer;
+		buflen = cmd->request_bufflen;
+	}
+
+	*buf_out = buf;
+	return buflen;
+}
+
+/**
+ *	ata_scsi_rbuf_put - Unmap response buffer.
+ *	@cmd: SCSI command containing buffer to be unmapped.
+ *	@buf: buffer to unmap
+ *
+ *	Unmaps response buffer contained within @cmd.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, u8 *buf)
+{
+	if (cmd->use_sg) {
+		struct scatterlist *sg;
+
+		sg = (struct scatterlist *) cmd->request_buffer;
+		kunmap_atomic(buf - sg->offset, KM_USER0);
+	}
+}
+
+/**
+ *	ata_scsi_rbuf_fill - wrapper for SCSI command simulators
+ *	@args: device IDENTIFY data / SCSI command of interest.
+ *	@actor: Callback hook for desired SCSI command simulator
+ *
+ *	Takes care of the hard work of simulating a SCSI command...
+ *	Mapping the response buffer, calling the command's handler,
+ *	and handling the handler's return value.  This return value
+ *	indicates whether the handler wishes the SCSI command to be
+ *	completed successfully (0), or not (in which case cmd->result
+ *	and sense buffer are assumed to be set).
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
+		        unsigned int (*actor) (struct ata_scsi_args *args,
+			     		   u8 *rbuf, unsigned int buflen))
+{
+	u8 *rbuf;
+	unsigned int buflen, rc;
+	struct scsi_cmnd *cmd = args->cmd;
+
+	buflen = ata_scsi_rbuf_get(cmd, &rbuf);
+	memset(rbuf, 0, buflen);
+	rc = actor(args, rbuf, buflen);
+	ata_scsi_rbuf_put(cmd, rbuf);
+
+	if (rc == 0)
+		cmd->result = SAM_STAT_GOOD;
+	args->done(cmd);
+}
+
+/**
+ *	ata_scsiop_inq_std - Simulate INQUIRY command
+ *	@args: device IDENTIFY data / SCSI command of interest.
+ *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
+ *	@buflen: Response buffer length.
+ *
+ *	Returns standard device identification data associated
+ *	with non-VPD INQUIRY command output.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf,
+			       unsigned int buflen)
+{
+	u8 hdr[] = {
+		TYPE_DISK,
+		0,
+		0x5,	/* claim SPC-3 version compatibility */
+		2,
+		95 - 4
+	};
+
+	/* set scsi removeable (RMB) bit per ata bit */
+	if (ata_id_removeable(args->id))
+		hdr[1] |= (1 << 7);
+
+	VPRINTK("ENTER\n");
+
+	memcpy(rbuf, hdr, sizeof(hdr));
+
+	if (buflen > 35) {
+		memcpy(&rbuf[8], "ATA     ", 8);
+		ata_id_string(args->id, &rbuf[16], ATA_ID_PROD_OFS, 16);
+		ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV_OFS, 4);
+		if (rbuf[32] == 0 || rbuf[32] == ' ')
+			memcpy(&rbuf[32], "n/a ", 4);
+	}
+
+	if (buflen > 63) {
+		const u8 versions[] = {
+			0x60,	/* SAM-3 (no version claimed) */
+
+			0x03,
+			0x20,	/* SBC-2 (no version claimed) */
+
+			0x02,
+			0x60	/* SPC-3 (no version claimed) */
+		};
+
+		memcpy(rbuf + 59, versions, sizeof(versions));
+	}
+
+	return 0;
+}
+
+/**
+ *	ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
+ *	@args: device IDENTIFY data / SCSI command of interest.
+ *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
+ *	@buflen: Response buffer length.
+ *
+ *	Returns list of inquiry VPD pages available.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf,
+			      unsigned int buflen)
+{
+	const u8 pages[] = {
+		0x00,	/* page 0x00, this page */
+		0x80,	/* page 0x80, unit serial no page */
+		0x83	/* page 0x83, device ident page */
+	};
+	rbuf[3] = sizeof(pages);	/* number of supported VPD pages */
+
+	if (buflen > 6)
+		memcpy(rbuf + 4, pages, sizeof(pages));
+
+	return 0;
+}
+
+/**
+ *	ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
+ *	@args: device IDENTIFY data / SCSI command of interest.
+ *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
+ *	@buflen: Response buffer length.
+ *
+ *	Returns ATA device serial number.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf,
+			      unsigned int buflen)
+{
+	const u8 hdr[] = {
+		0,
+		0x80,			/* this page code */
+		0,
+		ATA_SERNO_LEN,		/* page len */
+	};
+	memcpy(rbuf, hdr, sizeof(hdr));
+
+	if (buflen > (ATA_SERNO_LEN + 4 - 1))
+		ata_id_string(args->id, (unsigned char *) &rbuf[4],
+			      ATA_ID_SERNO_OFS, ATA_SERNO_LEN);
+
+	return 0;
+}
+
+/**
+ *	ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
+ *	@args: device IDENTIFY data / SCSI command of interest.
+ *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
+ *	@buflen: Response buffer length.
+ *
+ *	Yields two logical unit device identification designators:
+ *	 - vendor specific ASCII containing the ATA serial number
+ *	 - SAT defined "t10 vendor id based" containing ASCII vendor
+ *	   name ("ATA     "), model and serial numbers.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf,
+			      unsigned int buflen)
+{
+	int num;
+	const int sat_model_serial_desc_len = 68;
+	const int ata_model_byte_len = 40;
+
+	rbuf[1] = 0x83;			/* this page code */
+	num = 4;
+
+	if (buflen > (ATA_SERNO_LEN + num + 3)) {
+		/* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
+		rbuf[num + 0] = 2;
+		rbuf[num + 3] = ATA_SERNO_LEN;
+		num += 4;
+		ata_id_string(args->id, (unsigned char *) rbuf + num,
+			      ATA_ID_SERNO_OFS, ATA_SERNO_LEN);
+		num += ATA_SERNO_LEN;
+	}
+	if (buflen > (sat_model_serial_desc_len + num + 3)) {
+		/* SAT defined lu model and serial numbers descriptor */
+		/* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
+		rbuf[num + 0] = 2;
+		rbuf[num + 1] = 1;
+		rbuf[num + 3] = sat_model_serial_desc_len;
+		num += 4;
+		memcpy(rbuf + num, "ATA     ", 8);
+		num += 8;
+		ata_id_string(args->id, (unsigned char *) rbuf + num,
+			      ATA_ID_PROD_OFS, ata_model_byte_len);
+		num += ata_model_byte_len;
+		ata_id_string(args->id, (unsigned char *) rbuf + num,
+			      ATA_ID_SERNO_OFS, ATA_SERNO_LEN);
+		num += ATA_SERNO_LEN;
+	}
+	rbuf[3] = num - 4;    /* page len (assume less than 256 bytes) */
+	return 0;
+}
+
+/**
+ *	ata_scsiop_noop - Command handler that simply returns success.
+ *	@args: device IDENTIFY data / SCSI command of interest.
+ *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
+ *	@buflen: Response buffer length.
+ *
+ *	No operation.  Simply returns success to caller, to indicate
+ *	that the caller should successfully complete this SCSI command.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf,
+			    unsigned int buflen)
+{
+	VPRINTK("ENTER\n");
+	return 0;
+}
+
+/**
+ *	ata_msense_push - Push data onto MODE SENSE data output buffer
+ *	@ptr_io: (input/output) Location to store more output data
+ *	@last: End of output data buffer
+ *	@buf: Pointer to BLOB being added to output buffer
+ *	@buflen: Length of BLOB
+ *
+ *	Store MODE SENSE data on an output buffer.
+ *
+ *	LOCKING:
+ *	None.
+ */
+
+static void ata_msense_push(u8 **ptr_io, const u8 *last,
+			    const u8 *buf, unsigned int buflen)
+{
+	u8 *ptr = *ptr_io;
+
+	if ((ptr + buflen - 1) > last)
+		return;
+
+	memcpy(ptr, buf, buflen);
+
+	ptr += buflen;
+
+	*ptr_io = ptr;
+}
+
+/**
+ *	ata_msense_caching - Simulate MODE SENSE caching info page
+ *	@id: device IDENTIFY data
+ *	@ptr_io: (input/output) Location to store more output data
+ *	@last: End of output data buffer
+ *
+ *	Generate a caching info page, which conditionally indicates
+ *	write caching to the SCSI layer, depending on device
+ *	capabilities.
+ *
+ *	LOCKING:
+ *	None.
+ */
+
+static unsigned int ata_msense_caching(u16 *id, u8 **ptr_io,
+				       const u8 *last)
+{
+	u8 page[CACHE_MPAGE_LEN];
+
+	memcpy(page, def_cache_mpage, sizeof(page));
+	if (ata_id_wcache_enabled(id))
+		page[2] |= (1 << 2);	/* write cache enable */
+	if (!ata_id_rahead_enabled(id))
+		page[12] |= (1 << 5);	/* disable read ahead */
+
+	ata_msense_push(ptr_io, last, page, sizeof(page));
+	return sizeof(page);
+}
+
+/**
+ *	ata_msense_ctl_mode - Simulate MODE SENSE control mode page
+ *	@dev: Device associated with this MODE SENSE command
+ *	@ptr_io: (input/output) Location to store more output data
+ *	@last: End of output data buffer
+ *
+ *	Generate a generic MODE SENSE control mode page.
+ *
+ *	LOCKING:
+ *	None.
+ */
+
+static unsigned int ata_msense_ctl_mode(u8 **ptr_io, const u8 *last)
+{
+	ata_msense_push(ptr_io, last, def_control_mpage,
+			sizeof(def_control_mpage));
+	return sizeof(def_control_mpage);
+}
+
+/**
+ *	ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
+ *	@dev: Device associated with this MODE SENSE command
+ *	@ptr_io: (input/output) Location to store more output data
+ *	@last: End of output data buffer
+ *
+ *	Generate a generic MODE SENSE r/w error recovery page.
+ *
+ *	LOCKING:
+ *	None.
+ */
+
+static unsigned int ata_msense_rw_recovery(u8 **ptr_io, const u8 *last)
+{
+
+	ata_msense_push(ptr_io, last, def_rw_recovery_mpage,
+			sizeof(def_rw_recovery_mpage));
+	return sizeof(def_rw_recovery_mpage);
+}
+
+/*
+ * We can turn this into a real blacklist if it's needed, for now just
+ * blacklist any Maxtor BANC1G10 revision firmware
+ */
+static int ata_dev_supports_fua(u16 *id)
+{
+	unsigned char model[41], fw[9];
+
+	if (!libata_fua)
+		return 0;
+	if (!ata_id_has_fua(id))
+		return 0;
+
+	ata_id_c_string(id, model, ATA_ID_PROD_OFS, sizeof(model));
+	ata_id_c_string(id, fw, ATA_ID_FW_REV_OFS, sizeof(fw));
+
+	if (strcmp(model, "Maxtor"))
+		return 1;
+	if (strcmp(fw, "BANC1G10"))
+		return 1;
+
+	return 0; /* blacklisted */
+}
+
+/**
+ *	ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
+ *	@args: device IDENTIFY data / SCSI command of interest.
+ *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
+ *	@buflen: Response buffer length.
+ *
+ *	Simulate MODE SENSE commands. Assume this is invoked for direct
+ *	access devices (e.g. disks) only. There should be no block
+ *	descriptor for other device types.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf,
+				  unsigned int buflen)
+{
+	struct ata_device *dev = args->dev;
+	u8 *scsicmd = args->cmd->cmnd, *p, *last;
+	const u8 sat_blk_desc[] = {
+		0, 0, 0, 0,	/* number of blocks: sat unspecified */
+		0,
+		0, 0x2, 0x0	/* block length: 512 bytes */
+	};
+	u8 pg, spg;
+	unsigned int ebd, page_control, six_byte, output_len, alloc_len, minlen;
+	u8 dpofua;
+
+	VPRINTK("ENTER\n");
+
+	six_byte = (scsicmd[0] == MODE_SENSE);
+	ebd = !(scsicmd[1] & 0x8);      /* dbd bit inverted == edb */
+	/*
+	 * LLBA bit in msense(10) ignored (compliant)
+	 */
+
+	page_control = scsicmd[2] >> 6;
+	switch (page_control) {
+	case 0: /* current */
+		break;  /* supported */
+	case 3: /* saved */
+		goto saving_not_supp;
+	case 1: /* changeable */
+	case 2: /* defaults */
+	default:
+		goto invalid_fld;
+	}
+
+	if (six_byte) {
+		output_len = 4 + (ebd ? 8 : 0);
+		alloc_len = scsicmd[4];
+	} else {
+		output_len = 8 + (ebd ? 8 : 0);
+		alloc_len = (scsicmd[7] << 8) + scsicmd[8];
+	}
+	minlen = (alloc_len < buflen) ? alloc_len : buflen;
+
+	p = rbuf + output_len;
+	last = rbuf + minlen - 1;
+
+	pg = scsicmd[2] & 0x3f;
+	spg = scsicmd[3];
+	/*
+	 * No mode subpages supported (yet) but asking for _all_
+	 * subpages may be valid
+	 */
+	if (spg && (spg != ALL_SUB_MPAGES))
+		goto invalid_fld;
+
+	switch(pg) {
+	case RW_RECOVERY_MPAGE:
+		output_len += ata_msense_rw_recovery(&p, last);
+		break;
+
+	case CACHE_MPAGE:
+		output_len += ata_msense_caching(args->id, &p, last);
+		break;
+
+	case CONTROL_MPAGE: {
+		output_len += ata_msense_ctl_mode(&p, last);
+		break;
+		}
+
+	case ALL_MPAGES:
+		output_len += ata_msense_rw_recovery(&p, last);
+		output_len += ata_msense_caching(args->id, &p, last);
+		output_len += ata_msense_ctl_mode(&p, last);
+		break;
+
+	default:		/* invalid page code */
+		goto invalid_fld;
+	}
+
+	if (minlen < 1)
+		return 0;
+
+	dpofua = 0;
+	if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
+	    (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
+		dpofua = 1 << 4;
+
+	if (six_byte) {
+		output_len--;
+		rbuf[0] = output_len;
+		if (minlen > 2)
+			rbuf[2] |= dpofua;
+		if (ebd) {
+			if (minlen > 3)
+				rbuf[3] = sizeof(sat_blk_desc);
+			if (minlen > 11)
+				memcpy(rbuf + 4, sat_blk_desc,
+				       sizeof(sat_blk_desc));
+		}
+	} else {
+		output_len -= 2;
+		rbuf[0] = output_len >> 8;
+		if (minlen > 1)
+			rbuf[1] = output_len;
+		if (minlen > 3)
+			rbuf[3] |= dpofua;
+		if (ebd) {
+			if (minlen > 7)
+				rbuf[7] = sizeof(sat_blk_desc);
+			if (minlen > 15)
+				memcpy(rbuf + 8, sat_blk_desc,
+				       sizeof(sat_blk_desc));
+		}
+	}
+	return 0;
+
+invalid_fld:
+	ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
+	/* "Invalid field in cbd" */
+	return 1;
+
+saving_not_supp:
+	ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
+	 /* "Saving parameters not supported" */
+	return 1;
+}
+
+/**
+ *	ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
+ *	@args: device IDENTIFY data / SCSI command of interest.
+ *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
+ *	@buflen: Response buffer length.
+ *
+ *	Simulate READ CAPACITY commands.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf,
+			        unsigned int buflen)
+{
+	u64 n_sectors;
+	u32 tmp;
+
+	VPRINTK("ENTER\n");
+
+	if (ata_id_has_lba(args->id)) {
+		if (ata_id_has_lba48(args->id))
+			n_sectors = ata_id_u64(args->id, 100);
+		else
+			n_sectors = ata_id_u32(args->id, 60);
+	} else {
+		/* CHS default translation */
+		n_sectors = args->id[1] * args->id[3] * args->id[6];
+
+		if (ata_id_current_chs_valid(args->id))
+			/* CHS current translation */
+			n_sectors = ata_id_u32(args->id, 57);
+	}
+
+	n_sectors--;		/* ATA TotalUserSectors - 1 */
+
+	if (args->cmd->cmnd[0] == READ_CAPACITY) {
+		if( n_sectors >= 0xffffffffULL )
+			tmp = 0xffffffff ;  /* Return max count on overflow */
+		else
+			tmp = n_sectors ;
+
+		/* sector count, 32-bit */
+		rbuf[0] = tmp >> (8 * 3);
+		rbuf[1] = tmp >> (8 * 2);
+		rbuf[2] = tmp >> (8 * 1);
+		rbuf[3] = tmp;
+
+		/* sector size */
+		tmp = ATA_SECT_SIZE;
+		rbuf[6] = tmp >> 8;
+		rbuf[7] = tmp;
+
+	} else {
+		/* sector count, 64-bit */
+		tmp = n_sectors >> (8 * 4);
+		rbuf[2] = tmp >> (8 * 3);
+		rbuf[3] = tmp >> (8 * 2);
+		rbuf[4] = tmp >> (8 * 1);
+		rbuf[5] = tmp;
+		tmp = n_sectors;
+		rbuf[6] = tmp >> (8 * 3);
+		rbuf[7] = tmp >> (8 * 2);
+		rbuf[8] = tmp >> (8 * 1);
+		rbuf[9] = tmp;
+
+		/* sector size */
+		tmp = ATA_SECT_SIZE;
+		rbuf[12] = tmp >> 8;
+		rbuf[13] = tmp;
+	}
+
+	return 0;
+}
+
+/**
+ *	ata_scsiop_report_luns - Simulate REPORT LUNS command
+ *	@args: device IDENTIFY data / SCSI command of interest.
+ *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
+ *	@buflen: Response buffer length.
+ *
+ *	Simulate REPORT LUNS command.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf,
+				   unsigned int buflen)
+{
+	VPRINTK("ENTER\n");
+	rbuf[3] = 8;	/* just one lun, LUN 0, size 8 bytes */
+
+	return 0;
+}
+
+/**
+ *	ata_scsi_set_sense - Set SCSI sense data and status
+ *	@cmd: SCSI request to be handled
+ *	@sk: SCSI-defined sense key
+ *	@asc: SCSI-defined additional sense code
+ *	@ascq: SCSI-defined additional sense code qualifier
+ *
+ *	Helper function that builds a valid fixed format, current
+ *	response code and the given sense key (sk), additional sense
+ *	code (asc) and additional sense code qualifier (ascq) with
+ *	a SCSI command status of %SAM_STAT_CHECK_CONDITION and
+ *	DRIVER_SENSE set in the upper bits of scsi_cmnd::result .
+ *
+ *	LOCKING:
+ *	Not required
+ */
+
+void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
+{
+	cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
+
+	cmd->sense_buffer[0] = 0x70;	/* fixed format, current */
+	cmd->sense_buffer[2] = sk;
+	cmd->sense_buffer[7] = 18 - 8;	/* additional sense length */
+	cmd->sense_buffer[12] = asc;
+	cmd->sense_buffer[13] = ascq;
+}
+
+/**
+ *	ata_scsi_badcmd - End a SCSI request with an error
+ *	@cmd: SCSI request to be handled
+ *	@done: SCSI command completion function
+ *	@asc: SCSI-defined additional sense code
+ *	@ascq: SCSI-defined additional sense code qualifier
+ *
+ *	Helper function that completes a SCSI command with
+ *	%SAM_STAT_CHECK_CONDITION, with a sense key %ILLEGAL_REQUEST
+ *	and the specified additional sense codes.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+void ata_scsi_badcmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), u8 asc, u8 ascq)
+{
+	DPRINTK("ENTER\n");
+	ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, asc, ascq);
+
+	done(cmd);
+}
+
+static void atapi_sense_complete(struct ata_queued_cmd *qc)
+{
+	if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
+		/* FIXME: not quite right; we don't want the
+		 * translation of taskfile registers into
+		 * a sense descriptors, since that's only
+		 * correct for ATA, not ATAPI
+		 */
+		ata_gen_ata_desc_sense(qc);
+	}
+
+	qc->scsidone(qc->scsicmd);
+	ata_qc_free(qc);
+}
+
+/* is it pointless to prefer PIO for "safety reasons"? */
+static inline int ata_pio_use_silly(struct ata_port *ap)
+{
+	return (ap->flags & ATA_FLAG_PIO_DMA);
+}
+
+static void atapi_request_sense(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct scsi_cmnd *cmd = qc->scsicmd;
+
+	DPRINTK("ATAPI request sense\n");
+
+	/* FIXME: is this needed? */
+	memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
+
+	ap->ops->tf_read(ap, &qc->tf);
+
+	/* fill these in, for the case where they are -not- overwritten */
+	cmd->sense_buffer[0] = 0x70;
+	cmd->sense_buffer[2] = qc->tf.feature >> 4;
+
+	ata_qc_reinit(qc);
+
+	ata_sg_init_one(qc, cmd->sense_buffer, sizeof(cmd->sense_buffer));
+	qc->dma_dir = DMA_FROM_DEVICE;
+
+	memset(&qc->cdb, 0, qc->dev->cdb_len);
+	qc->cdb[0] = REQUEST_SENSE;
+	qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
+
+	qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+	qc->tf.command = ATA_CMD_PACKET;
+
+	if (ata_pio_use_silly(ap)) {
+		qc->tf.protocol = ATA_PROT_ATAPI_DMA;
+		qc->tf.feature |= ATAPI_PKT_DMA;
+	} else {
+		qc->tf.protocol = ATA_PROT_ATAPI;
+		qc->tf.lbam = (8 * 1024) & 0xff;
+		qc->tf.lbah = (8 * 1024) >> 8;
+	}
+	qc->nbytes = SCSI_SENSE_BUFFERSIZE;
+
+	qc->complete_fn = atapi_sense_complete;
+
+	ata_qc_issue(qc);
+
+	DPRINTK("EXIT\n");
+}
+
+static void atapi_qc_complete(struct ata_queued_cmd *qc)
+{
+	struct scsi_cmnd *cmd = qc->scsicmd;
+	unsigned int err_mask = qc->err_mask;
+
+	VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
+
+	/* handle completion from new EH */
+	if (unlikely(qc->ap->ops->error_handler &&
+		     (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
+
+		if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
+			/* FIXME: not quite right; we don't want the
+			 * translation of taskfile registers into a
+			 * sense descriptors, since that's only
+			 * correct for ATA, not ATAPI
+			 */
+			ata_gen_ata_desc_sense(qc);
+		}
+
+		/* SCSI EH automatically locks door if sdev->locked is
+		 * set.  Sometimes door lock request continues to
+		 * fail, for example, when no media is present.  This
+		 * creates a loop - SCSI EH issues door lock which
+		 * fails and gets invoked again to acquire sense data
+		 * for the failed command.
+		 *
+		 * If door lock fails, always clear sdev->locked to
+		 * avoid this infinite loop.
+		 */
+		if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL)
+			qc->dev->sdev->locked = 0;
+
+		qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
+		qc->scsidone(cmd);
+		ata_qc_free(qc);
+		return;
+	}
+
+	/* successful completion or old EH failure path */
+	if (unlikely(err_mask & AC_ERR_DEV)) {
+		cmd->result = SAM_STAT_CHECK_CONDITION;
+		atapi_request_sense(qc);
+		return;
+	} else if (unlikely(err_mask)) {
+		/* FIXME: not quite right; we don't want the
+		 * translation of taskfile registers into
+		 * a sense descriptors, since that's only
+		 * correct for ATA, not ATAPI
+		 */
+		ata_gen_ata_desc_sense(qc);
+	} else {
+		u8 *scsicmd = cmd->cmnd;
+
+		if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
+			u8 *buf = NULL;
+			unsigned int buflen;
+
+			buflen = ata_scsi_rbuf_get(cmd, &buf);
+
+	/* ATAPI devices typically report zero for their SCSI version,
+	 * and sometimes deviate from the spec WRT response data
+	 * format.  If SCSI version is reported as zero like normal,
+	 * then we make the following fixups:  1) Fake MMC-5 version,
+	 * to indicate to the Linux scsi midlayer this is a modern
+	 * device.  2) Ensure response data format / ATAPI information
+	 * are always correct.
+	 */
+			if (buf[2] == 0) {
+				buf[2] = 0x5;
+				buf[3] = 0x32;
+			}
+
+			ata_scsi_rbuf_put(cmd, buf);
+		}
+
+		cmd->result = SAM_STAT_GOOD;
+	}
+
+	qc->scsidone(cmd);
+	ata_qc_free(qc);
+}
+/**
+ *	atapi_xlat - Initialize PACKET taskfile
+ *	@qc: command structure to be initialized
+ *	@scsicmd: SCSI CDB associated with this PACKET command
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	Zero on success, non-zero on failure.
+ */
+
+static unsigned int atapi_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
+{
+	struct scsi_cmnd *cmd = qc->scsicmd;
+	struct ata_device *dev = qc->dev;
+	int using_pio = (dev->flags & ATA_DFLAG_PIO);
+	int nodata = (cmd->sc_data_direction == DMA_NONE);
+
+	if (!using_pio)
+		/* Check whether ATAPI DMA is safe */
+		if (ata_check_atapi_dma(qc))
+			using_pio = 1;
+
+	memcpy(&qc->cdb, scsicmd, dev->cdb_len);
+
+	qc->complete_fn = atapi_qc_complete;
+
+	qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+	if (cmd->sc_data_direction == DMA_TO_DEVICE) {
+		qc->tf.flags |= ATA_TFLAG_WRITE;
+		DPRINTK("direction: write\n");
+	}
+
+	qc->tf.command = ATA_CMD_PACKET;
+
+	/* no data, or PIO data xfer */
+	if (using_pio || nodata) {
+		if (nodata)
+			qc->tf.protocol = ATA_PROT_ATAPI_NODATA;
+		else
+			qc->tf.protocol = ATA_PROT_ATAPI;
+		qc->tf.lbam = (8 * 1024) & 0xff;
+		qc->tf.lbah = (8 * 1024) >> 8;
+	}
+
+	/* DMA data xfer */
+	else {
+		qc->tf.protocol = ATA_PROT_ATAPI_DMA;
+		qc->tf.feature |= ATAPI_PKT_DMA;
+
+		if (atapi_dmadir && (cmd->sc_data_direction != DMA_TO_DEVICE))
+			/* some SATA bridges need us to indicate data xfer direction */
+			qc->tf.feature |= ATAPI_DMADIR;
+	}
+
+	qc->nbytes = cmd->request_bufflen;
+
+	return 0;
+}
+
+static struct ata_device * ata_find_dev(struct ata_port *ap, int id)
+{
+	if (likely(id < ATA_MAX_DEVICES))
+		return &ap->device[id];
+	return NULL;
+}
+
+static struct ata_device * __ata_scsi_find_dev(struct ata_port *ap,
+					const struct scsi_device *scsidev)
+{
+	/* skip commands not addressed to targets we simulate */
+	if (unlikely(scsidev->channel || scsidev->lun))
+		return NULL;
+
+	return ata_find_dev(ap, scsidev->id);
+}
+
+/**
+ *	ata_scsi_dev_enabled - determine if device is enabled
+ *	@dev: ATA device
+ *
+ *	Determine if commands should be sent to the specified device.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	0 if commands are not allowed / 1 if commands are allowed
+ */
+
+static int ata_scsi_dev_enabled(struct ata_device *dev)
+{
+	if (unlikely(!ata_dev_enabled(dev)))
+		return 0;
+
+	if (!atapi_enabled || (dev->ap->flags & ATA_FLAG_NO_ATAPI)) {
+		if (unlikely(dev->class == ATA_DEV_ATAPI)) {
+			ata_dev_printk(dev, KERN_WARNING,
+				       "WARNING: ATAPI is %s, device ignored.\n",
+				       atapi_enabled ? "not supported with this driver" : "disabled");
+			return 0;
+		}
+	}
+
+	return 1;
+}
+
+/**
+ *	ata_scsi_find_dev - lookup ata_device from scsi_cmnd
+ *	@ap: ATA port to which the device is attached
+ *	@scsidev: SCSI device from which we derive the ATA device
+ *
+ *	Given various information provided in struct scsi_cmnd,
+ *	map that onto an ATA bus, and using that mapping
+ *	determine which ata_device is associated with the
+ *	SCSI command to be sent.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	Associated ATA device, or %NULL if not found.
+ */
+static struct ata_device *
+ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
+{
+	struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
+
+	if (unlikely(!dev || !ata_scsi_dev_enabled(dev)))
+		return NULL;
+
+	return dev;
+}
+
+/*
+ *	ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
+ *	@byte1: Byte 1 from pass-thru CDB.
+ *
+ *	RETURNS:
+ *	ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
+ */
+static u8
+ata_scsi_map_proto(u8 byte1)
+{
+	switch((byte1 & 0x1e) >> 1) {
+		case 3:		/* Non-data */
+			return ATA_PROT_NODATA;
+
+		case 6:		/* DMA */
+			return ATA_PROT_DMA;
+
+		case 4:		/* PIO Data-in */
+		case 5:		/* PIO Data-out */
+			return ATA_PROT_PIO;
+
+		case 10:	/* Device Reset */
+		case 0:		/* Hard Reset */
+		case 1:		/* SRST */
+		case 2:		/* Bus Idle */
+		case 7:		/* Packet */
+		case 8:		/* DMA Queued */
+		case 9:		/* Device Diagnostic */
+		case 11:	/* UDMA Data-in */
+		case 12:	/* UDMA Data-Out */
+		case 13:	/* FPDMA */
+		default:	/* Reserved */
+			break;
+	}
+
+	return ATA_PROT_UNKNOWN;
+}
+
+/**
+ *	ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
+ *	@qc: command structure to be initialized
+ *	@scsicmd: SCSI command to convert
+ *
+ *	Handles either 12 or 16-byte versions of the CDB.
+ *
+ *	RETURNS:
+ *	Zero on success, non-zero on failure.
+ */
+static unsigned int
+ata_scsi_pass_thru(struct ata_queued_cmd *qc, const u8 *scsicmd)
+{
+	struct ata_taskfile *tf = &(qc->tf);
+	struct scsi_cmnd *cmd = qc->scsicmd;
+	struct ata_device *dev = qc->dev;
+
+	if ((tf->protocol = ata_scsi_map_proto(scsicmd[1])) == ATA_PROT_UNKNOWN)
+		goto invalid_fld;
+
+	/* We may not issue DMA commands if no DMA mode is set */
+	if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
+		goto invalid_fld;
+
+	if (scsicmd[1] & 0xe0)
+		/* PIO multi not supported yet */
+		goto invalid_fld;
+
+	/*
+	 * 12 and 16 byte CDBs use different offsets to
+	 * provide the various register values.
+	 */
+	if (scsicmd[0] == ATA_16) {
+		/*
+		 * 16-byte CDB - may contain extended commands.
+		 *
+		 * If that is the case, copy the upper byte register values.
+		 */
+		if (scsicmd[1] & 0x01) {
+			tf->hob_feature = scsicmd[3];
+			tf->hob_nsect = scsicmd[5];
+			tf->hob_lbal = scsicmd[7];
+			tf->hob_lbam = scsicmd[9];
+			tf->hob_lbah = scsicmd[11];
+			tf->flags |= ATA_TFLAG_LBA48;
+		} else
+			tf->flags &= ~ATA_TFLAG_LBA48;
+
+		/*
+		 * Always copy low byte, device and command registers.
+		 */
+		tf->feature = scsicmd[4];
+		tf->nsect = scsicmd[6];
+		tf->lbal = scsicmd[8];
+		tf->lbam = scsicmd[10];
+		tf->lbah = scsicmd[12];
+		tf->device = scsicmd[13];
+		tf->command = scsicmd[14];
+	} else {
+		/*
+		 * 12-byte CDB - incapable of extended commands.
+		 */
+		tf->flags &= ~ATA_TFLAG_LBA48;
+
+		tf->feature = scsicmd[3];
+		tf->nsect = scsicmd[4];
+		tf->lbal = scsicmd[5];
+		tf->lbam = scsicmd[6];
+		tf->lbah = scsicmd[7];
+		tf->device = scsicmd[8];
+		tf->command = scsicmd[9];
+	}
+	/*
+	 * If slave is possible, enforce correct master/slave bit
+	*/
+	if (qc->ap->flags & ATA_FLAG_SLAVE_POSS)
+		tf->device = qc->dev->devno ?
+			tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
+
+	/*
+	 * Filter SET_FEATURES - XFER MODE command -- otherwise,
+	 * SET_FEATURES - XFER MODE must be preceded/succeeded
+	 * by an update to hardware-specific registers for each
+	 * controller (i.e. the reason for ->set_piomode(),
+	 * ->set_dmamode(), and ->post_set_mode() hooks).
+	 */
+	if ((tf->command == ATA_CMD_SET_FEATURES)
+	 && (tf->feature == SETFEATURES_XFER))
+		goto invalid_fld;
+
+	/*
+	 * Set flags so that all registers will be written,
+	 * and pass on write indication (used for PIO/DMA
+	 * setup.)
+	 */
+	tf->flags |= (ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE);
+
+	if (cmd->sc_data_direction == DMA_TO_DEVICE)
+		tf->flags |= ATA_TFLAG_WRITE;
+
+	/*
+	 * Set transfer length.
+	 *
+	 * TODO: find out if we need to do more here to
+	 *       cover scatter/gather case.
+	 */
+	qc->nsect = cmd->request_bufflen / ATA_SECT_SIZE;
+
+	/* request result TF */
+	qc->flags |= ATA_QCFLAG_RESULT_TF;
+
+	return 0;
+
+ invalid_fld:
+	ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x00);
+	/* "Invalid field in cdb" */
+	return 1;
+}
+
+/**
+ *	ata_get_xlat_func - check if SCSI to ATA translation is possible
+ *	@dev: ATA device
+ *	@cmd: SCSI command opcode to consider
+ *
+ *	Look up the SCSI command given, and determine whether the
+ *	SCSI command is to be translated or simulated.
+ *
+ *	RETURNS:
+ *	Pointer to translation function if possible, %NULL if not.
+ */
+
+static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
+{
+	switch (cmd) {
+	case READ_6:
+	case READ_10:
+	case READ_16:
+
+	case WRITE_6:
+	case WRITE_10:
+	case WRITE_16:
+		return ata_scsi_rw_xlat;
+
+	case SYNCHRONIZE_CACHE:
+		if (ata_try_flush_cache(dev))
+			return ata_scsi_flush_xlat;
+		break;
+
+	case VERIFY:
+	case VERIFY_16:
+		return ata_scsi_verify_xlat;
+
+	case ATA_12:
+	case ATA_16:
+		return ata_scsi_pass_thru;
+
+	case START_STOP:
+		return ata_scsi_start_stop_xlat;
+	}
+
+	return NULL;
+}
+
+/**
+ *	ata_scsi_dump_cdb - dump SCSI command contents to dmesg
+ *	@ap: ATA port to which the command was being sent
+ *	@cmd: SCSI command to dump
+ *
+ *	Prints the contents of a SCSI command via printk().
+ */
+
+static inline void ata_scsi_dump_cdb(struct ata_port *ap,
+				     struct scsi_cmnd *cmd)
+{
+#ifdef ATA_DEBUG
+	struct scsi_device *scsidev = cmd->device;
+	u8 *scsicmd = cmd->cmnd;
+
+	DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
+		ap->id,
+		scsidev->channel, scsidev->id, scsidev->lun,
+		scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
+		scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
+		scsicmd[8]);
+#endif
+}
+
+static inline int __ata_scsi_queuecmd(struct scsi_cmnd *cmd,
+				      void (*done)(struct scsi_cmnd *),
+				      struct ata_device *dev)
+{
+	int rc = 0;
+
+	if (dev->class == ATA_DEV_ATA) {
+		ata_xlat_func_t xlat_func = ata_get_xlat_func(dev,
+							      cmd->cmnd[0]);
+
+		if (xlat_func)
+			rc = ata_scsi_translate(dev, cmd, done, xlat_func);
+		else
+			ata_scsi_simulate(dev, cmd, done);
+	} else
+		rc = ata_scsi_translate(dev, cmd, done, atapi_xlat);
+
+	return rc;
+}
+
+/**
+ *	ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
+ *	@cmd: SCSI command to be sent
+ *	@done: Completion function, called when command is complete
+ *
+ *	In some cases, this function translates SCSI commands into
+ *	ATA taskfiles, and queues the taskfiles to be sent to
+ *	hardware.  In other cases, this function simulates a
+ *	SCSI device by evaluating and responding to certain
+ *	SCSI commands.  This creates the overall effect of
+ *	ATA and ATAPI devices appearing as SCSI devices.
+ *
+ *	LOCKING:
+ *	Releases scsi-layer-held lock, and obtains host_set lock.
+ *
+ *	RETURNS:
+ *	Return value from __ata_scsi_queuecmd() if @cmd can be queued,
+ *	0 otherwise.
+ */
+int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
+{
+	struct ata_port *ap;
+	struct ata_device *dev;
+	struct scsi_device *scsidev = cmd->device;
+	struct Scsi_Host *shost = scsidev->host;
+	int rc = 0;
+
+	ap = ata_shost_to_port(shost);
+
+	spin_unlock(shost->host_lock);
+	spin_lock(ap->lock);
+
+	ata_scsi_dump_cdb(ap, cmd);
+
+	dev = ata_scsi_find_dev(ap, scsidev);
+	if (likely(dev))
+		rc = __ata_scsi_queuecmd(cmd, done, dev);
+	else {
+		cmd->result = (DID_BAD_TARGET << 16);
+		done(cmd);
+	}
+
+	spin_unlock(ap->lock);
+	spin_lock(shost->host_lock);
+	return rc;
+}
+
+/**
+ *	ata_scsi_simulate - simulate SCSI command on ATA device
+ *	@dev: the target device
+ *	@cmd: SCSI command being sent to device.
+ *	@done: SCSI command completion function.
+ *
+ *	Interprets and directly executes a select list of SCSI commands
+ *	that can be handled internally.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
+		      void (*done)(struct scsi_cmnd *))
+{
+	struct ata_scsi_args args;
+	const u8 *scsicmd = cmd->cmnd;
+
+	args.dev = dev;
+	args.id = dev->id;
+	args.cmd = cmd;
+	args.done = done;
+
+	switch(scsicmd[0]) {
+		/* no-op's, complete with success */
+		case SYNCHRONIZE_CACHE:
+		case REZERO_UNIT:
+		case SEEK_6:
+		case SEEK_10:
+		case TEST_UNIT_READY:
+		case FORMAT_UNIT:		/* FIXME: correct? */
+		case SEND_DIAGNOSTIC:		/* FIXME: correct? */
+			ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
+			break;
+
+		case INQUIRY:
+			if (scsicmd[1] & 2)	           /* is CmdDt set?  */
+				ata_scsi_invalid_field(cmd, done);
+			else if ((scsicmd[1] & 1) == 0)    /* is EVPD clear? */
+				ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
+			else if (scsicmd[2] == 0x00)
+				ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
+			else if (scsicmd[2] == 0x80)
+				ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
+			else if (scsicmd[2] == 0x83)
+				ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
+			else
+				ata_scsi_invalid_field(cmd, done);
+			break;
+
+		case MODE_SENSE:
+		case MODE_SENSE_10:
+			ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
+			break;
+
+		case MODE_SELECT:	/* unconditionally return */
+		case MODE_SELECT_10:	/* bad-field-in-cdb */
+			ata_scsi_invalid_field(cmd, done);
+			break;
+
+		case READ_CAPACITY:
+			ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
+			break;
+
+		case SERVICE_ACTION_IN:
+			if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
+				ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
+			else
+				ata_scsi_invalid_field(cmd, done);
+			break;
+
+		case REPORT_LUNS:
+			ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
+			break;
+
+		/* mandatory commands we haven't implemented yet */
+		case REQUEST_SENSE:
+
+		/* all other commands */
+		default:
+			ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
+			/* "Invalid command operation code" */
+			done(cmd);
+			break;
+	}
+}
+
+void ata_scsi_scan_host(struct ata_port *ap)
+{
+	unsigned int i;
+
+	if (ap->flags & ATA_FLAG_DISABLED)
+		return;
+
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		struct ata_device *dev = &ap->device[i];
+		struct scsi_device *sdev;
+
+		if (!ata_dev_enabled(dev) || dev->sdev)
+			continue;
+
+		sdev = __scsi_add_device(ap->host, 0, i, 0, NULL);
+		if (!IS_ERR(sdev)) {
+			dev->sdev = sdev;
+			scsi_device_put(sdev);
+		}
+	}
+}
+
+/**
+ *	ata_scsi_offline_dev - offline attached SCSI device
+ *	@dev: ATA device to offline attached SCSI device for
+ *
+ *	This function is called from ata_eh_hotplug() and responsible
+ *	for taking the SCSI device attached to @dev offline.  This
+ *	function is called with host_set lock which protects dev->sdev
+ *	against clearing.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ *
+ *	RETURNS:
+ *	1 if attached SCSI device exists, 0 otherwise.
+ */
+int ata_scsi_offline_dev(struct ata_device *dev)
+{
+	if (dev->sdev) {
+		scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
+		return 1;
+	}
+	return 0;
+}
+
+/**
+ *	ata_scsi_remove_dev - remove attached SCSI device
+ *	@dev: ATA device to remove attached SCSI device for
+ *
+ *	This function is called from ata_eh_scsi_hotplug() and
+ *	responsible for removing the SCSI device attached to @dev.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+static void ata_scsi_remove_dev(struct ata_device *dev)
+{
+	struct ata_port *ap = dev->ap;
+	struct scsi_device *sdev;
+	unsigned long flags;
+
+	/* Alas, we need to grab scan_mutex to ensure SCSI device
+	 * state doesn't change underneath us and thus
+	 * scsi_device_get() always succeeds.  The mutex locking can
+	 * be removed if there is __scsi_device_get() interface which
+	 * increments reference counts regardless of device state.
+	 */
+	mutex_lock(&ap->host->scan_mutex);
+	spin_lock_irqsave(ap->lock, flags);
+
+	/* clearing dev->sdev is protected by host_set lock */
+	sdev = dev->sdev;
+	dev->sdev = NULL;
+
+	if (sdev) {
+		/* If user initiated unplug races with us, sdev can go
+		 * away underneath us after the host_set lock and
+		 * scan_mutex are released.  Hold onto it.
+		 */
+		if (scsi_device_get(sdev) == 0) {
+			/* The following ensures the attached sdev is
+			 * offline on return from ata_scsi_offline_dev()
+			 * regardless it wins or loses the race
+			 * against this function.
+			 */
+			scsi_device_set_state(sdev, SDEV_OFFLINE);
+		} else {
+			WARN_ON(1);
+			sdev = NULL;
+		}
+	}
+
+	spin_unlock_irqrestore(ap->lock, flags);
+	mutex_unlock(&ap->host->scan_mutex);
+
+	if (sdev) {
+		ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n",
+			       sdev->sdev_gendev.bus_id);
+
+		scsi_remove_device(sdev);
+		scsi_device_put(sdev);
+	}
+}
+
+/**
+ *	ata_scsi_hotplug - SCSI part of hotplug
+ *	@data: Pointer to ATA port to perform SCSI hotplug on
+ *
+ *	Perform SCSI part of hotplug.  It's executed from a separate
+ *	workqueue after EH completes.  This is necessary because SCSI
+ *	hot plugging requires working EH and hot unplugging is
+ *	synchronized with hot plugging with a mutex.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+void ata_scsi_hotplug(void *data)
+{
+	struct ata_port *ap = data;
+	int i;
+
+	if (ap->pflags & ATA_PFLAG_UNLOADING) {
+		DPRINTK("ENTER/EXIT - unloading\n");
+		return;
+	}
+
+	DPRINTK("ENTER\n");
+
+	/* unplug detached devices */
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		struct ata_device *dev = &ap->device[i];
+		unsigned long flags;
+
+		if (!(dev->flags & ATA_DFLAG_DETACHED))
+			continue;
+
+		spin_lock_irqsave(ap->lock, flags);
+		dev->flags &= ~ATA_DFLAG_DETACHED;
+		spin_unlock_irqrestore(ap->lock, flags);
+
+		ata_scsi_remove_dev(dev);
+	}
+
+	/* scan for new ones */
+	ata_scsi_scan_host(ap);
+
+	/* If we scanned while EH was in progress, scan would have
+	 * failed silently.  Requeue if there are enabled but
+	 * unattached devices.
+	 */
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		struct ata_device *dev = &ap->device[i];
+		if (ata_dev_enabled(dev) && !dev->sdev) {
+			queue_delayed_work(ata_aux_wq, &ap->hotplug_task, HZ);
+			break;
+		}
+	}
+
+	DPRINTK("EXIT\n");
+}
+
+/**
+ *	ata_scsi_user_scan - indication for user-initiated bus scan
+ *	@shost: SCSI host to scan
+ *	@channel: Channel to scan
+ *	@id: ID to scan
+ *	@lun: LUN to scan
+ *
+ *	This function is called when user explicitly requests bus
+ *	scan.  Set probe pending flag and invoke EH.
+ *
+ *	LOCKING:
+ *	SCSI layer (we don't care)
+ *
+ *	RETURNS:
+ *	Zero.
+ */
+static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
+			      unsigned int id, unsigned int lun)
+{
+	struct ata_port *ap = ata_shost_to_port(shost);
+	unsigned long flags;
+	int rc = 0;
+
+	if (!ap->ops->error_handler)
+		return -EOPNOTSUPP;
+
+	if ((channel != SCAN_WILD_CARD && channel != 0) ||
+	    (lun != SCAN_WILD_CARD && lun != 0))
+		return -EINVAL;
+
+	spin_lock_irqsave(ap->lock, flags);
+
+	if (id == SCAN_WILD_CARD) {
+		ap->eh_info.probe_mask |= (1 << ATA_MAX_DEVICES) - 1;
+		ap->eh_info.action |= ATA_EH_SOFTRESET;
+	} else {
+		struct ata_device *dev = ata_find_dev(ap, id);
+
+		if (dev) {
+			ap->eh_info.probe_mask |= 1 << dev->devno;
+			ap->eh_info.action |= ATA_EH_SOFTRESET;
+			ap->eh_info.flags |= ATA_EHI_RESUME_LINK;
+		} else
+			rc = -EINVAL;
+	}
+
+	if (rc == 0)
+		ata_port_schedule_eh(ap);
+
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	return rc;
+}
+
+/**
+ *	ata_scsi_dev_rescan - initiate scsi_rescan_device()
+ *	@data: Pointer to ATA port to perform scsi_rescan_device()
+ *
+ *	After ATA pass thru (SAT) commands are executed successfully,
+ *	libata need to propagate the changes to SCSI layer.  This
+ *	function must be executed from ata_aux_wq such that sdev
+ *	attach/detach don't race with rescan.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+void ata_scsi_dev_rescan(void *data)
+{
+	struct ata_port *ap = data;
+	struct ata_device *dev;
+	unsigned int i;
+
+	for (i = 0; i < ATA_MAX_DEVICES; i++) {
+		dev = &ap->device[i];
+
+		if (ata_dev_enabled(dev) && dev->sdev)
+			scsi_rescan_device(&(dev->sdev->sdev_gendev));
+	}
+}
+
+/**
+ *	ata_sas_port_alloc - Allocate port for a SAS attached SATA device
+ *	@pdev: PCI device that the scsi device is attached to
+ *	@port_info: Information from low-level host driver
+ *	@host: SCSI host that the scsi device is attached to
+ *
+ *	LOCKING:
+ *	PCI/etc. bus probe sem.
+ *
+ *	RETURNS:
+ *	ata_port pointer on success / NULL on failure.
+ */
+
+struct ata_port *ata_sas_port_alloc(struct ata_host_set *host_set,
+				    struct ata_port_info *port_info,
+				    struct Scsi_Host *host)
+{
+	struct ata_port *ap = kzalloc(sizeof(*ap), GFP_KERNEL);
+	struct ata_probe_ent *ent;
+
+	if (!ap)
+		return NULL;
+
+	ent = ata_probe_ent_alloc(host_set->dev, port_info);
+	if (!ent) {
+		kfree(ap);
+		return NULL;
+	}
+
+	ata_port_init(ap, host_set, ent, 0);
+	ap->lock = host->host_lock;
+	kfree(ent);
+	return ap;
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
+
+/**
+ *	ata_sas_port_start - Set port up for dma.
+ *	@ap: Port to initialize
+ *
+ *	Called just after data structures for each port are
+ *	initialized.  Allocates DMA pad.
+ *
+ *	May be used as the port_start() entry in ata_port_operations.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+int ata_sas_port_start(struct ata_port *ap)
+{
+	return ata_pad_alloc(ap, ap->dev);
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_start);
+
+/**
+ *	ata_port_stop - Undo ata_sas_port_start()
+ *	@ap: Port to shut down
+ *
+ *	Frees the DMA pad.
+ *
+ *	May be used as the port_stop() entry in ata_port_operations.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+
+void ata_sas_port_stop(struct ata_port *ap)
+{
+	ata_pad_free(ap, ap->dev);
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_stop);
+
+/**
+ *	ata_sas_port_init - Initialize a SATA device
+ *	@ap: SATA port to initialize
+ *
+ *	LOCKING:
+ *	PCI/etc. bus probe sem.
+ *
+ *	RETURNS:
+ *	Zero on success, non-zero on error.
+ */
+
+int ata_sas_port_init(struct ata_port *ap)
+{
+	int rc = ap->ops->port_start(ap);
+
+	if (!rc)
+		rc = ata_bus_probe(ap);
+
+	return rc;
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_init);
+
+/**
+ *	ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
+ *	@ap: SATA port to destroy
+ *
+ */
+
+void ata_sas_port_destroy(struct ata_port *ap)
+{
+	ap->ops->port_stop(ap);
+	kfree(ap);
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
+
+/**
+ *	ata_sas_slave_configure - Default slave_config routine for libata devices
+ *	@sdev: SCSI device to configure
+ *	@ap: ATA port to which SCSI device is attached
+ *
+ *	RETURNS:
+ *	Zero.
+ */
+
+int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
+{
+	ata_scsi_sdev_config(sdev);
+	ata_scsi_dev_config(sdev, ap->device);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
+
+/**
+ *	ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
+ *	@cmd: SCSI command to be sent
+ *	@done: Completion function, called when command is complete
+ *	@ap:	ATA port to which the command is being sent
+ *
+ *	RETURNS:
+ *	Zero.
+ */
+
+int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
+		     struct ata_port *ap)
+{
+	ata_scsi_dump_cdb(ap, cmd);
+
+	if (likely(ata_scsi_dev_enabled(ap->device)))
+		__ata_scsi_queuecmd(cmd, done, ap->device);
+	else {
+		cmd->result = (DID_BAD_TARGET << 16);
+		done(cmd);
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
new file mode 100644
index 0000000..d4a4f82
--- /dev/null
+++ b/drivers/ata/libata.h
@@ -0,0 +1,122 @@
+/*
+ *  libata.h - helper library for ATA
+ *
+ *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
+ *  Copyright 2003-2004 Jeff Garzik
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ *  libata documentation is available via 'make {ps|pdf}docs',
+ *  as Documentation/DocBook/libata.*
+ *
+ */
+
+#ifndef __LIBATA_H__
+#define __LIBATA_H__
+
+#define DRV_NAME	"libata"
+#define DRV_VERSION	"2.00"	/* must be exactly four chars */
+
+struct ata_scsi_args {
+	struct ata_device	*dev;
+	u16			*id;
+	struct scsi_cmnd	*cmd;
+	void			(*done)(struct scsi_cmnd *);
+};
+
+/* libata-core.c */
+extern struct workqueue_struct *ata_aux_wq;
+extern int atapi_enabled;
+extern int atapi_dmadir;
+extern int libata_fua;
+extern struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev);
+extern int ata_rwcmd_protocol(struct ata_queued_cmd *qc);
+extern void ata_dev_disable(struct ata_device *dev);
+extern void ata_port_flush_task(struct ata_port *ap);
+extern unsigned ata_exec_internal(struct ata_device *dev,
+				  struct ata_taskfile *tf, const u8 *cdb,
+				  int dma_dir, void *buf, unsigned int buflen);
+extern unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd);
+extern int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
+			   int post_reset, u16 *id);
+extern int ata_dev_configure(struct ata_device *dev, int print_info);
+extern int sata_down_spd_limit(struct ata_port *ap);
+extern int sata_set_spd_needed(struct ata_port *ap);
+extern int ata_down_xfermask_limit(struct ata_device *dev, int force_pio0);
+extern int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev);
+extern void ata_qc_free(struct ata_queued_cmd *qc);
+extern void ata_qc_issue(struct ata_queued_cmd *qc);
+extern void __ata_qc_complete(struct ata_queued_cmd *qc);
+extern int ata_check_atapi_dma(struct ata_queued_cmd *qc);
+extern void ata_dev_select(struct ata_port *ap, unsigned int device,
+                           unsigned int wait, unsigned int can_sleep);
+extern void swap_buf_le16(u16 *buf, unsigned int buf_words);
+extern int ata_flush_cache(struct ata_device *dev);
+extern void ata_dev_init(struct ata_device *dev);
+extern int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg);
+extern int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg);
+extern void ata_port_init(struct ata_port *ap, struct ata_host_set *host_set,
+			  const struct ata_probe_ent *ent, unsigned int port_no);
+extern struct ata_probe_ent *ata_probe_ent_alloc(struct device *dev,
+						 const struct ata_port_info *port);
+
+
+/* libata-scsi.c */
+extern struct scsi_transport_template ata_scsi_transport_template;
+
+extern void ata_scsi_scan_host(struct ata_port *ap);
+extern int ata_scsi_offline_dev(struct ata_device *dev);
+extern void ata_scsi_hotplug(void *data);
+extern unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf,
+			       unsigned int buflen);
+
+extern unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf,
+			      unsigned int buflen);
+
+extern unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf,
+			      unsigned int buflen);
+extern unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf,
+			      unsigned int buflen);
+extern unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf,
+			    unsigned int buflen);
+extern unsigned int ata_scsiop_sync_cache(struct ata_scsi_args *args, u8 *rbuf,
+				  unsigned int buflen);
+extern unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf,
+				  unsigned int buflen);
+extern unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf,
+			        unsigned int buflen);
+extern unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf,
+				   unsigned int buflen);
+extern void ata_scsi_badcmd(struct scsi_cmnd *cmd,
+			    void (*done)(struct scsi_cmnd *),
+			    u8 asc, u8 ascq);
+extern void ata_scsi_set_sense(struct scsi_cmnd *cmd,
+			       u8 sk, u8 asc, u8 ascq);
+extern void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
+                        unsigned int (*actor) (struct ata_scsi_args *args,
+                                           u8 *rbuf, unsigned int buflen));
+extern void ata_schedule_scsi_eh(struct Scsi_Host *shost);
+extern void ata_scsi_dev_rescan(void *data);
+extern int ata_bus_probe(struct ata_port *ap);
+
+/* libata-eh.c */
+extern enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd);
+extern void ata_scsi_error(struct Scsi_Host *host);
+extern void ata_port_wait_eh(struct ata_port *ap);
+extern void ata_qc_schedule_eh(struct ata_queued_cmd *qc);
+
+#endif /* __LIBATA_H__ */
diff --git a/drivers/ata/pdc_adma.c b/drivers/ata/pdc_adma.c
new file mode 100644
index 0000000..61d2aa6
--- /dev/null
+++ b/drivers/ata/pdc_adma.c
@@ -0,0 +1,740 @@
+/*
+ *  pdc_adma.c - Pacific Digital Corporation ADMA
+ *
+ *  Maintained by:  Mark Lord <mlord@pobox.com>
+ *
+ *  Copyright 2005 Mark Lord
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ *  libata documentation is available via 'make {ps|pdf}docs',
+ *  as Documentation/DocBook/libata.*
+ *
+ *
+ *  Supports ATA disks in single-packet ADMA mode.
+ *  Uses PIO for everything else.
+ *
+ *  TODO:  Use ADMA transfers for ATAPI devices, when possible.
+ *  This requires careful attention to a number of quirks of the chip.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+#include <linux/device.h>
+#include <scsi/scsi_host.h>
+#include <asm/io.h>
+#include <linux/libata.h>
+
+#define DRV_NAME	"pdc_adma"
+#define DRV_VERSION	"0.04"
+
+/* macro to calculate base address for ATA regs */
+#define ADMA_ATA_REGS(base,port_no)	((base) + ((port_no) * 0x40))
+
+/* macro to calculate base address for ADMA regs */
+#define ADMA_REGS(base,port_no)	((base) + 0x80 + ((port_no) * 0x20))
+
+enum {
+	ADMA_PORTS		= 2,
+	ADMA_CPB_BYTES		= 40,
+	ADMA_PRD_BYTES		= LIBATA_MAX_PRD * 16,
+	ADMA_PKT_BYTES		= ADMA_CPB_BYTES + ADMA_PRD_BYTES,
+
+	ADMA_DMA_BOUNDARY	= 0xffffffff,
+
+	/* global register offsets */
+	ADMA_MODE_LOCK		= 0x00c7,
+
+	/* per-channel register offsets */
+	ADMA_CONTROL		= 0x0000, /* ADMA control */
+	ADMA_STATUS		= 0x0002, /* ADMA status */
+	ADMA_CPB_COUNT		= 0x0004, /* CPB count */
+	ADMA_CPB_CURRENT	= 0x000c, /* current CPB address */
+	ADMA_CPB_NEXT		= 0x000c, /* next CPB address */
+	ADMA_CPB_LOOKUP		= 0x0010, /* CPB lookup table */
+	ADMA_FIFO_IN		= 0x0014, /* input FIFO threshold */
+	ADMA_FIFO_OUT		= 0x0016, /* output FIFO threshold */
+
+	/* ADMA_CONTROL register bits */
+	aNIEN			= (1 << 8), /* irq mask: 1==masked */
+	aGO			= (1 << 7), /* packet trigger ("Go!") */
+	aRSTADM			= (1 << 5), /* ADMA logic reset */
+	aPIOMD4			= 0x0003,   /* PIO mode 4 */
+
+	/* ADMA_STATUS register bits */
+	aPSD			= (1 << 6),
+	aUIRQ			= (1 << 4),
+	aPERR			= (1 << 0),
+
+	/* CPB bits */
+	cDONE			= (1 << 0),
+	cVLD			= (1 << 0),
+	cDAT			= (1 << 2),
+	cIEN			= (1 << 3),
+
+	/* PRD bits */
+	pORD			= (1 << 4),
+	pDIRO			= (1 << 5),
+	pEND			= (1 << 7),
+
+	/* ATA register flags */
+	rIGN			= (1 << 5),
+	rEND			= (1 << 7),
+
+	/* ATA register addresses */
+	ADMA_REGS_CONTROL	= 0x0e,
+	ADMA_REGS_SECTOR_COUNT	= 0x12,
+	ADMA_REGS_LBA_LOW	= 0x13,
+	ADMA_REGS_LBA_MID	= 0x14,
+	ADMA_REGS_LBA_HIGH	= 0x15,
+	ADMA_REGS_DEVICE	= 0x16,
+	ADMA_REGS_COMMAND	= 0x17,
+
+	/* PCI device IDs */
+	board_1841_idx		= 0,	/* ADMA 2-port controller */
+};
+
+typedef enum { adma_state_idle, adma_state_pkt, adma_state_mmio } adma_state_t;
+
+struct adma_port_priv {
+	u8			*pkt;
+	dma_addr_t		pkt_dma;
+	adma_state_t		state;
+};
+
+static int adma_ata_init_one (struct pci_dev *pdev,
+				const struct pci_device_id *ent);
+static irqreturn_t adma_intr (int irq, void *dev_instance,
+				struct pt_regs *regs);
+static int adma_port_start(struct ata_port *ap);
+static void adma_host_stop(struct ata_host_set *host_set);
+static void adma_port_stop(struct ata_port *ap);
+static void adma_phy_reset(struct ata_port *ap);
+static void adma_qc_prep(struct ata_queued_cmd *qc);
+static unsigned int adma_qc_issue(struct ata_queued_cmd *qc);
+static int adma_check_atapi_dma(struct ata_queued_cmd *qc);
+static void adma_bmdma_stop(struct ata_queued_cmd *qc);
+static u8 adma_bmdma_status(struct ata_port *ap);
+static void adma_irq_clear(struct ata_port *ap);
+static void adma_eng_timeout(struct ata_port *ap);
+
+static struct scsi_host_template adma_ata_sht = {
+	.module			= THIS_MODULE,
+	.name			= DRV_NAME,
+	.ioctl			= ata_scsi_ioctl,
+	.queuecommand		= ata_scsi_queuecmd,
+	.can_queue		= ATA_DEF_QUEUE,
+	.this_id		= ATA_SHT_THIS_ID,
+	.sg_tablesize		= LIBATA_MAX_PRD,
+	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
+	.emulated		= ATA_SHT_EMULATED,
+	.use_clustering		= ENABLE_CLUSTERING,
+	.proc_name		= DRV_NAME,
+	.dma_boundary		= ADMA_DMA_BOUNDARY,
+	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
+	.bios_param		= ata_std_bios_param,
+};
+
+static const struct ata_port_operations adma_ata_ops = {
+	.port_disable		= ata_port_disable,
+	.tf_load		= ata_tf_load,
+	.tf_read		= ata_tf_read,
+	.check_status		= ata_check_status,
+	.check_atapi_dma	= adma_check_atapi_dma,
+	.exec_command		= ata_exec_command,
+	.dev_select		= ata_std_dev_select,
+	.phy_reset		= adma_phy_reset,
+	.qc_prep		= adma_qc_prep,
+	.qc_issue		= adma_qc_issue,
+	.eng_timeout		= adma_eng_timeout,
+	.data_xfer		= ata_mmio_data_xfer,
+	.irq_handler		= adma_intr,
+	.irq_clear		= adma_irq_clear,
+	.port_start		= adma_port_start,
+	.port_stop		= adma_port_stop,
+	.host_stop		= adma_host_stop,
+	.bmdma_stop		= adma_bmdma_stop,
+	.bmdma_status		= adma_bmdma_status,
+};
+
+static struct ata_port_info adma_port_info[] = {
+	/* board_1841_idx */
+	{
+		.sht		= &adma_ata_sht,
+		.host_flags	= ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST |
+				  ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO |
+				  ATA_FLAG_PIO_POLLING,
+		.pio_mask	= 0x10, /* pio4 */
+		.udma_mask	= 0x1f, /* udma0-4 */
+		.port_ops	= &adma_ata_ops,
+	},
+};
+
+static const struct pci_device_id adma_ata_pci_tbl[] = {
+	{ PCI_VENDOR_ID_PDC, 0x1841, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_1841_idx },
+
+	{ }	/* terminate list */
+};
+
+static struct pci_driver adma_ata_pci_driver = {
+	.name			= DRV_NAME,
+	.id_table		= adma_ata_pci_tbl,
+	.probe			= adma_ata_init_one,
+	.remove			= ata_pci_remove_one,
+};
+
+static int adma_check_atapi_dma(struct ata_queued_cmd *qc)
+{
+	return 1;	/* ATAPI DMA not yet supported */
+}
+
+static void adma_bmdma_stop(struct ata_queued_cmd *qc)
+{
+	/* nothing */
+}
+
+static u8 adma_bmdma_status(struct ata_port *ap)
+{
+	return 0;
+}
+
+static void adma_irq_clear(struct ata_port *ap)
+{
+	/* nothing */
+}
+
+static void adma_reset_engine(void __iomem *chan)
+{
+	/* reset ADMA to idle state */
+	writew(aPIOMD4 | aNIEN | aRSTADM, chan + ADMA_CONTROL);
+	udelay(2);
+	writew(aPIOMD4, chan + ADMA_CONTROL);
+	udelay(2);
+}
+
+static void adma_reinit_engine(struct ata_port *ap)
+{
+	struct adma_port_priv *pp = ap->private_data;
+	void __iomem *mmio_base = ap->host_set->mmio_base;
+	void __iomem *chan = ADMA_REGS(mmio_base, ap->port_no);
+
+	/* mask/clear ATA interrupts */
+	writeb(ATA_NIEN, (void __iomem *)ap->ioaddr.ctl_addr);
+	ata_check_status(ap);
+
+	/* reset the ADMA engine */
+	adma_reset_engine(chan);
+
+	/* set in-FIFO threshold to 0x100 */
+	writew(0x100, chan + ADMA_FIFO_IN);
+
+	/* set CPB pointer */
+	writel((u32)pp->pkt_dma, chan + ADMA_CPB_NEXT);
+
+	/* set out-FIFO threshold to 0x100 */
+	writew(0x100, chan + ADMA_FIFO_OUT);
+
+	/* set CPB count */
+	writew(1, chan + ADMA_CPB_COUNT);
+
+	/* read/discard ADMA status */
+	readb(chan + ADMA_STATUS);
+}
+
+static inline void adma_enter_reg_mode(struct ata_port *ap)
+{
+	void __iomem *chan = ADMA_REGS(ap->host_set->mmio_base, ap->port_no);
+
+	writew(aPIOMD4, chan + ADMA_CONTROL);
+	readb(chan + ADMA_STATUS);	/* flush */
+}
+
+static void adma_phy_reset(struct ata_port *ap)
+{
+	struct adma_port_priv *pp = ap->private_data;
+
+	pp->state = adma_state_idle;
+	adma_reinit_engine(ap);
+	ata_port_probe(ap);
+	ata_bus_reset(ap);
+}
+
+static void adma_eng_timeout(struct ata_port *ap)
+{
+	struct adma_port_priv *pp = ap->private_data;
+
+	if (pp->state != adma_state_idle) /* healthy paranoia */
+		pp->state = adma_state_mmio;
+	adma_reinit_engine(ap);
+	ata_eng_timeout(ap);
+}
+
+static int adma_fill_sg(struct ata_queued_cmd *qc)
+{
+	struct scatterlist *sg;
+	struct ata_port *ap = qc->ap;
+	struct adma_port_priv *pp = ap->private_data;
+	u8  *buf = pp->pkt;
+	int i = (2 + buf[3]) * 8;
+	u8 pFLAGS = pORD | ((qc->tf.flags & ATA_TFLAG_WRITE) ? pDIRO : 0);
+
+	ata_for_each_sg(sg, qc) {
+		u32 addr;
+		u32 len;
+
+		addr = (u32)sg_dma_address(sg);
+		*(__le32 *)(buf + i) = cpu_to_le32(addr);
+		i += 4;
+
+		len = sg_dma_len(sg) >> 3;
+		*(__le32 *)(buf + i) = cpu_to_le32(len);
+		i += 4;
+
+		if (ata_sg_is_last(sg, qc))
+			pFLAGS |= pEND;
+		buf[i++] = pFLAGS;
+		buf[i++] = qc->dev->dma_mode & 0xf;
+		buf[i++] = 0;	/* pPKLW */
+		buf[i++] = 0;	/* reserved */
+
+		*(__le32 *)(buf + i)
+			= (pFLAGS & pEND) ? 0 : cpu_to_le32(pp->pkt_dma + i + 4);
+		i += 4;
+
+		VPRINTK("PRD[%u] = (0x%lX, 0x%X)\n", i/4,
+					(unsigned long)addr, len);
+	}
+	return i;
+}
+
+static void adma_qc_prep(struct ata_queued_cmd *qc)
+{
+	struct adma_port_priv *pp = qc->ap->private_data;
+	u8  *buf = pp->pkt;
+	u32 pkt_dma = (u32)pp->pkt_dma;
+	int i = 0;
+
+	VPRINTK("ENTER\n");
+
+	adma_enter_reg_mode(qc->ap);
+	if (qc->tf.protocol != ATA_PROT_DMA) {
+		ata_qc_prep(qc);
+		return;
+	}
+
+	buf[i++] = 0;	/* Response flags */
+	buf[i++] = 0;	/* reserved */
+	buf[i++] = cVLD | cDAT | cIEN;
+	i++;		/* cLEN, gets filled in below */
+
+	*(__le32 *)(buf+i) = cpu_to_le32(pkt_dma);	/* cNCPB */
+	i += 4;		/* cNCPB */
+	i += 4;		/* cPRD, gets filled in below */
+
+	buf[i++] = 0;	/* reserved */
+	buf[i++] = 0;	/* reserved */
+	buf[i++] = 0;	/* reserved */
+	buf[i++] = 0;	/* reserved */
+
+	/* ATA registers; must be a multiple of 4 */
+	buf[i++] = qc->tf.device;
+	buf[i++] = ADMA_REGS_DEVICE;
+	if ((qc->tf.flags & ATA_TFLAG_LBA48)) {
+		buf[i++] = qc->tf.hob_nsect;
+		buf[i++] = ADMA_REGS_SECTOR_COUNT;
+		buf[i++] = qc->tf.hob_lbal;
+		buf[i++] = ADMA_REGS_LBA_LOW;
+		buf[i++] = qc->tf.hob_lbam;
+		buf[i++] = ADMA_REGS_LBA_MID;
+		buf[i++] = qc->tf.hob_lbah;
+		buf[i++] = ADMA_REGS_LBA_HIGH;
+	}
+	buf[i++] = qc->tf.nsect;
+	buf[i++] = ADMA_REGS_SECTOR_COUNT;
+	buf[i++] = qc->tf.lbal;
+	buf[i++] = ADMA_REGS_LBA_LOW;
+	buf[i++] = qc->tf.lbam;
+	buf[i++] = ADMA_REGS_LBA_MID;
+	buf[i++] = qc->tf.lbah;
+	buf[i++] = ADMA_REGS_LBA_HIGH;
+	buf[i++] = 0;
+	buf[i++] = ADMA_REGS_CONTROL;
+	buf[i++] = rIGN;
+	buf[i++] = 0;
+	buf[i++] = qc->tf.command;
+	buf[i++] = ADMA_REGS_COMMAND | rEND;
+
+	buf[3] = (i >> 3) - 2;				/* cLEN */
+	*(__le32 *)(buf+8) = cpu_to_le32(pkt_dma + i);	/* cPRD */
+
+	i = adma_fill_sg(qc);
+	wmb();	/* flush PRDs and pkt to memory */
+#if 0
+	/* dump out CPB + PRDs for debug */
+	{
+		int j, len = 0;
+		static char obuf[2048];
+		for (j = 0; j < i; ++j) {
+			len += sprintf(obuf+len, "%02x ", buf[j]);
+			if ((j & 7) == 7) {
+				printk("%s\n", obuf);
+				len = 0;
+			}
+		}
+		if (len)
+			printk("%s\n", obuf);
+	}
+#endif
+}
+
+static inline void adma_packet_start(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	void __iomem *chan = ADMA_REGS(ap->host_set->mmio_base, ap->port_no);
+
+	VPRINTK("ENTER, ap %p\n", ap);
+
+	/* fire up the ADMA engine */
+	writew(aPIOMD4 | aGO, chan + ADMA_CONTROL);
+}
+
+static unsigned int adma_qc_issue(struct ata_queued_cmd *qc)
+{
+	struct adma_port_priv *pp = qc->ap->private_data;
+
+	switch (qc->tf.protocol) {
+	case ATA_PROT_DMA:
+		pp->state = adma_state_pkt;
+		adma_packet_start(qc);
+		return 0;
+
+	case ATA_PROT_ATAPI_DMA:
+		BUG();
+		break;
+
+	default:
+		break;
+	}
+
+	pp->state = adma_state_mmio;
+	return ata_qc_issue_prot(qc);
+}
+
+static inline unsigned int adma_intr_pkt(struct ata_host_set *host_set)
+{
+	unsigned int handled = 0, port_no;
+	u8 __iomem *mmio_base = host_set->mmio_base;
+
+	for (port_no = 0; port_no < host_set->n_ports; ++port_no) {
+		struct ata_port *ap = host_set->ports[port_no];
+		struct adma_port_priv *pp;
+		struct ata_queued_cmd *qc;
+		void __iomem *chan = ADMA_REGS(mmio_base, port_no);
+		u8 status = readb(chan + ADMA_STATUS);
+
+		if (status == 0)
+			continue;
+		handled = 1;
+		adma_enter_reg_mode(ap);
+		if (ap->flags & ATA_FLAG_DISABLED)
+			continue;
+		pp = ap->private_data;
+		if (!pp || pp->state != adma_state_pkt)
+			continue;
+		qc = ata_qc_from_tag(ap, ap->active_tag);
+		if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
+			if ((status & (aPERR | aPSD | aUIRQ)))
+				qc->err_mask |= AC_ERR_OTHER;
+			else if (pp->pkt[0] != cDONE)
+				qc->err_mask |= AC_ERR_OTHER;
+
+			ata_qc_complete(qc);
+		}
+	}
+	return handled;
+}
+
+static inline unsigned int adma_intr_mmio(struct ata_host_set *host_set)
+{
+	unsigned int handled = 0, port_no;
+
+	for (port_no = 0; port_no < host_set->n_ports; ++port_no) {
+		struct ata_port *ap;
+		ap = host_set->ports[port_no];
+		if (ap && (!(ap->flags & ATA_FLAG_DISABLED))) {
+			struct ata_queued_cmd *qc;
+			struct adma_port_priv *pp = ap->private_data;
+			if (!pp || pp->state != adma_state_mmio)
+				continue;
+			qc = ata_qc_from_tag(ap, ap->active_tag);
+			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
+
+				/* check main status, clearing INTRQ */
+				u8 status = ata_check_status(ap);
+				if ((status & ATA_BUSY))
+					continue;
+				DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
+					ap->id, qc->tf.protocol, status);
+		
+				/* complete taskfile transaction */
+				pp->state = adma_state_idle;
+				qc->err_mask |= ac_err_mask(status);
+				ata_qc_complete(qc);
+				handled = 1;
+			}
+		}
+	}
+	return handled;
+}
+
+static irqreturn_t adma_intr(int irq, void *dev_instance, struct pt_regs *regs)
+{
+	struct ata_host_set *host_set = dev_instance;
+	unsigned int handled = 0;
+
+	VPRINTK("ENTER\n");
+
+	spin_lock(&host_set->lock);
+	handled  = adma_intr_pkt(host_set) | adma_intr_mmio(host_set);
+	spin_unlock(&host_set->lock);
+
+	VPRINTK("EXIT\n");
+
+	return IRQ_RETVAL(handled);
+}
+
+static void adma_ata_setup_port(struct ata_ioports *port, unsigned long base)
+{
+	port->cmd_addr		=
+	port->data_addr		= base + 0x000;
+	port->error_addr	=
+	port->feature_addr	= base + 0x004;
+	port->nsect_addr	= base + 0x008;
+	port->lbal_addr		= base + 0x00c;
+	port->lbam_addr		= base + 0x010;
+	port->lbah_addr		= base + 0x014;
+	port->device_addr	= base + 0x018;
+	port->status_addr	=
+	port->command_addr	= base + 0x01c;
+	port->altstatus_addr	=
+	port->ctl_addr		= base + 0x038;
+}
+
+static int adma_port_start(struct ata_port *ap)
+{
+	struct device *dev = ap->host_set->dev;
+	struct adma_port_priv *pp;
+	int rc;
+
+	rc = ata_port_start(ap);
+	if (rc)
+		return rc;
+	adma_enter_reg_mode(ap);
+	rc = -ENOMEM;
+	pp = kcalloc(1, sizeof(*pp), GFP_KERNEL);
+	if (!pp)
+		goto err_out;
+	pp->pkt = dma_alloc_coherent(dev, ADMA_PKT_BYTES, &pp->pkt_dma,
+								GFP_KERNEL);
+	if (!pp->pkt)
+		goto err_out_kfree;
+	/* paranoia? */
+	if ((pp->pkt_dma & 7) != 0) {
+		printk("bad alignment for pp->pkt_dma: %08x\n",
+						(u32)pp->pkt_dma);
+		dma_free_coherent(dev, ADMA_PKT_BYTES,
+						pp->pkt, pp->pkt_dma);
+		goto err_out_kfree;
+	}
+	memset(pp->pkt, 0, ADMA_PKT_BYTES);
+	ap->private_data = pp;
+	adma_reinit_engine(ap);
+	return 0;
+
+err_out_kfree:
+	kfree(pp);
+err_out:
+	ata_port_stop(ap);
+	return rc;
+}
+
+static void adma_port_stop(struct ata_port *ap)
+{
+	struct device *dev = ap->host_set->dev;
+	struct adma_port_priv *pp = ap->private_data;
+
+	adma_reset_engine(ADMA_REGS(ap->host_set->mmio_base, ap->port_no));
+	if (pp != NULL) {
+		ap->private_data = NULL;
+		if (pp->pkt != NULL)
+			dma_free_coherent(dev, ADMA_PKT_BYTES,
+					pp->pkt, pp->pkt_dma);
+		kfree(pp);
+	}
+	ata_port_stop(ap);
+}
+
+static void adma_host_stop(struct ata_host_set *host_set)
+{
+	unsigned int port_no;
+
+	for (port_no = 0; port_no < ADMA_PORTS; ++port_no)
+		adma_reset_engine(ADMA_REGS(host_set->mmio_base, port_no));
+
+	ata_pci_host_stop(host_set);
+}
+
+static void adma_host_init(unsigned int chip_id,
+				struct ata_probe_ent *probe_ent)
+{
+	unsigned int port_no;
+	void __iomem *mmio_base = probe_ent->mmio_base;
+
+	/* enable/lock aGO operation */
+	writeb(7, mmio_base + ADMA_MODE_LOCK);
+
+	/* reset the ADMA logic */
+	for (port_no = 0; port_no < ADMA_PORTS; ++port_no)
+		adma_reset_engine(ADMA_REGS(mmio_base, port_no));
+}
+
+static int adma_set_dma_masks(struct pci_dev *pdev, void __iomem *mmio_base)
+{
+	int rc;
+
+	rc = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
+	if (rc) {
+		dev_printk(KERN_ERR, &pdev->dev,
+			"32-bit DMA enable failed\n");
+		return rc;
+	}
+	rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
+	if (rc) {
+		dev_printk(KERN_ERR, &pdev->dev,
+			"32-bit consistent DMA enable failed\n");
+		return rc;
+	}
+	return 0;
+}
+
+static int adma_ata_init_one(struct pci_dev *pdev,
+				const struct pci_device_id *ent)
+{
+	static int printed_version;
+	struct ata_probe_ent *probe_ent = NULL;
+	void __iomem *mmio_base;
+	unsigned int board_idx = (unsigned int) ent->driver_data;
+	int rc, port_no;
+
+	if (!printed_version++)
+		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
+
+	rc = pci_enable_device(pdev);
+	if (rc)
+		return rc;
+
+	rc = pci_request_regions(pdev, DRV_NAME);
+	if (rc)
+		goto err_out;
+
+	if ((pci_resource_flags(pdev, 4) & IORESOURCE_MEM) == 0) {
+		rc = -ENODEV;
+		goto err_out_regions;
+	}
+
+	mmio_base = pci_iomap(pdev, 4, 0);
+	if (mmio_base == NULL) {
+		rc = -ENOMEM;
+		goto err_out_regions;
+	}
+
+	rc = adma_set_dma_masks(pdev, mmio_base);
+	if (rc)
+		goto err_out_iounmap;
+
+	probe_ent = kcalloc(1, sizeof(*probe_ent), GFP_KERNEL);
+	if (probe_ent == NULL) {
+		rc = -ENOMEM;
+		goto err_out_iounmap;
+	}
+
+	probe_ent->dev = pci_dev_to_dev(pdev);
+	INIT_LIST_HEAD(&probe_ent->node);
+
+	probe_ent->sht		= adma_port_info[board_idx].sht;
+	probe_ent->host_flags	= adma_port_info[board_idx].host_flags;
+	probe_ent->pio_mask	= adma_port_info[board_idx].pio_mask;
+	probe_ent->mwdma_mask	= adma_port_info[board_idx].mwdma_mask;
+	probe_ent->udma_mask	= adma_port_info[board_idx].udma_mask;
+	probe_ent->port_ops	= adma_port_info[board_idx].port_ops;
+
+	probe_ent->irq		= pdev->irq;
+	probe_ent->irq_flags	= IRQF_SHARED;
+	probe_ent->mmio_base	= mmio_base;
+	probe_ent->n_ports	= ADMA_PORTS;
+
+	for (port_no = 0; port_no < probe_ent->n_ports; ++port_no) {
+		adma_ata_setup_port(&probe_ent->port[port_no],
+			ADMA_ATA_REGS((unsigned long)mmio_base, port_no));
+	}
+
+	pci_set_master(pdev);
+
+	/* initialize adapter */
+	adma_host_init(board_idx, probe_ent);
+
+	rc = ata_device_add(probe_ent);
+	kfree(probe_ent);
+	if (rc != ADMA_PORTS)
+		goto err_out_iounmap;
+	return 0;
+
+err_out_iounmap:
+	pci_iounmap(pdev, mmio_base);
+err_out_regions:
+	pci_release_regions(pdev);
+err_out:
+	pci_disable_device(pdev);
+	return rc;
+}
+
+static int __init adma_ata_init(void)
+{
+	return pci_register_driver(&adma_ata_pci_driver);
+}
+
+static void __exit adma_ata_exit(void)
+{
+	pci_unregister_driver(&adma_ata_pci_driver);
+}
+
+MODULE_AUTHOR("Mark Lord");
+MODULE_DESCRIPTION("Pacific Digital Corporation ADMA low-level driver");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, adma_ata_pci_tbl);
+MODULE_VERSION(DRV_VERSION);
+
+module_init(adma_ata_init);
+module_exit(adma_ata_exit);
diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
new file mode 100644
index 0000000..a2915a5
--- /dev/null
+++ b/drivers/ata/sata_mv.c
@@ -0,0 +1,2468 @@
+/*
+ * sata_mv.c - Marvell SATA support
+ *
+ * Copyright 2005: EMC Corporation, all rights reserved.
+ * Copyright 2005 Red Hat, Inc.  All rights reserved.
+ *
+ * Please ALWAYS copy linux-ide@vger.kernel.org on emails.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+#include <linux/dma-mapping.h>
+#include <linux/device.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_cmnd.h>
+#include <linux/libata.h>
+#include <asm/io.h>
+
+#define DRV_NAME	"sata_mv"
+#define DRV_VERSION	"0.7"
+
+enum {
+	/* BAR's are enumerated in terms of pci_resource_start() terms */
+	MV_PRIMARY_BAR		= 0,	/* offset 0x10: memory space */
+	MV_IO_BAR		= 2,	/* offset 0x18: IO space */
+	MV_MISC_BAR		= 3,	/* offset 0x1c: FLASH, NVRAM, SRAM */
+
+	MV_MAJOR_REG_AREA_SZ	= 0x10000,	/* 64KB */
+	MV_MINOR_REG_AREA_SZ	= 0x2000,	/* 8KB */
+
+	MV_PCI_REG_BASE		= 0,
+	MV_IRQ_COAL_REG_BASE	= 0x18000,	/* 6xxx part only */
+	MV_IRQ_COAL_CAUSE		= (MV_IRQ_COAL_REG_BASE + 0x08),
+	MV_IRQ_COAL_CAUSE_LO		= (MV_IRQ_COAL_REG_BASE + 0x88),
+	MV_IRQ_COAL_CAUSE_HI		= (MV_IRQ_COAL_REG_BASE + 0x8c),
+	MV_IRQ_COAL_THRESHOLD		= (MV_IRQ_COAL_REG_BASE + 0xcc),
+	MV_IRQ_COAL_TIME_THRESHOLD	= (MV_IRQ_COAL_REG_BASE + 0xd0),
+
+	MV_SATAHC0_REG_BASE	= 0x20000,
+	MV_FLASH_CTL		= 0x1046c,
+	MV_GPIO_PORT_CTL	= 0x104f0,
+	MV_RESET_CFG		= 0x180d8,
+
+	MV_PCI_REG_SZ		= MV_MAJOR_REG_AREA_SZ,
+	MV_SATAHC_REG_SZ	= MV_MAJOR_REG_AREA_SZ,
+	MV_SATAHC_ARBTR_REG_SZ	= MV_MINOR_REG_AREA_SZ,		/* arbiter */
+	MV_PORT_REG_SZ		= MV_MINOR_REG_AREA_SZ,
+
+	MV_USE_Q_DEPTH		= ATA_DEF_QUEUE,
+
+	MV_MAX_Q_DEPTH		= 32,
+	MV_MAX_Q_DEPTH_MASK	= MV_MAX_Q_DEPTH - 1,
+
+	/* CRQB needs alignment on a 1KB boundary. Size == 1KB
+	 * CRPB needs alignment on a 256B boundary. Size == 256B
+	 * SG count of 176 leads to MV_PORT_PRIV_DMA_SZ == 4KB
+	 * ePRD (SG) entries need alignment on a 16B boundary. Size == 16B
+	 */
+	MV_CRQB_Q_SZ		= (32 * MV_MAX_Q_DEPTH),
+	MV_CRPB_Q_SZ		= (8 * MV_MAX_Q_DEPTH),
+	MV_MAX_SG_CT		= 176,
+	MV_SG_TBL_SZ		= (16 * MV_MAX_SG_CT),
+	MV_PORT_PRIV_DMA_SZ	= (MV_CRQB_Q_SZ + MV_CRPB_Q_SZ + MV_SG_TBL_SZ),
+
+	MV_PORTS_PER_HC		= 4,
+	/* == (port / MV_PORTS_PER_HC) to determine HC from 0-7 port */
+	MV_PORT_HC_SHIFT	= 2,
+	/* == (port % MV_PORTS_PER_HC) to determine hard port from 0-7 port */
+	MV_PORT_MASK		= 3,
+
+	/* Host Flags */
+	MV_FLAG_DUAL_HC		= (1 << 30),  /* two SATA Host Controllers */
+	MV_FLAG_IRQ_COALESCE	= (1 << 29),  /* IRQ coalescing capability */
+	MV_COMMON_FLAGS		= (ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+				   ATA_FLAG_SATA_RESET | ATA_FLAG_MMIO |
+				   ATA_FLAG_NO_ATAPI | ATA_FLAG_PIO_POLLING),
+	MV_6XXX_FLAGS		= MV_FLAG_IRQ_COALESCE,
+
+	CRQB_FLAG_READ		= (1 << 0),
+	CRQB_TAG_SHIFT		= 1,
+	CRQB_CMD_ADDR_SHIFT	= 8,
+	CRQB_CMD_CS		= (0x2 << 11),
+	CRQB_CMD_LAST		= (1 << 15),
+
+	CRPB_FLAG_STATUS_SHIFT	= 8,
+
+	EPRD_FLAG_END_OF_TBL	= (1 << 31),
+
+	/* PCI interface registers */
+
+	PCI_COMMAND_OFS		= 0xc00,
+
+	PCI_MAIN_CMD_STS_OFS	= 0xd30,
+	STOP_PCI_MASTER		= (1 << 2),
+	PCI_MASTER_EMPTY	= (1 << 3),
+	GLOB_SFT_RST		= (1 << 4),
+
+	MV_PCI_MODE		= 0xd00,
+	MV_PCI_EXP_ROM_BAR_CTL	= 0xd2c,
+	MV_PCI_DISC_TIMER	= 0xd04,
+	MV_PCI_MSI_TRIGGER	= 0xc38,
+	MV_PCI_SERR_MASK	= 0xc28,
+	MV_PCI_XBAR_TMOUT	= 0x1d04,
+	MV_PCI_ERR_LOW_ADDRESS	= 0x1d40,
+	MV_PCI_ERR_HIGH_ADDRESS	= 0x1d44,
+	MV_PCI_ERR_ATTRIBUTE	= 0x1d48,
+	MV_PCI_ERR_COMMAND	= 0x1d50,
+
+	PCI_IRQ_CAUSE_OFS		= 0x1d58,
+	PCI_IRQ_MASK_OFS		= 0x1d5c,
+	PCI_UNMASK_ALL_IRQS	= 0x7fffff,	/* bits 22-0 */
+
+	HC_MAIN_IRQ_CAUSE_OFS	= 0x1d60,
+	HC_MAIN_IRQ_MASK_OFS	= 0x1d64,
+	PORT0_ERR		= (1 << 0),	/* shift by port # */
+	PORT0_DONE		= (1 << 1),	/* shift by port # */
+	HC0_IRQ_PEND		= 0x1ff,	/* bits 0-8 = HC0's ports */
+	HC_SHIFT		= 9,		/* bits 9-17 = HC1's ports */
+	PCI_ERR			= (1 << 18),
+	TRAN_LO_DONE		= (1 << 19),	/* 6xxx: IRQ coalescing */
+	TRAN_HI_DONE		= (1 << 20),	/* 6xxx: IRQ coalescing */
+	PORTS_0_7_COAL_DONE	= (1 << 21),	/* 6xxx: IRQ coalescing */
+	GPIO_INT		= (1 << 22),
+	SELF_INT		= (1 << 23),
+	TWSI_INT		= (1 << 24),
+	HC_MAIN_RSVD		= (0x7f << 25),	/* bits 31-25 */
+	HC_MAIN_MASKED_IRQS	= (TRAN_LO_DONE | TRAN_HI_DONE |
+				   PORTS_0_7_COAL_DONE | GPIO_INT | TWSI_INT |
+				   HC_MAIN_RSVD),
+
+	/* SATAHC registers */
+	HC_CFG_OFS		= 0,
+
+	HC_IRQ_CAUSE_OFS	= 0x14,
+	CRPB_DMA_DONE		= (1 << 0),	/* shift by port # */
+	HC_IRQ_COAL		= (1 << 4),	/* IRQ coalescing */
+	DEV_IRQ			= (1 << 8),	/* shift by port # */
+
+	/* Shadow block registers */
+	SHD_BLK_OFS		= 0x100,
+	SHD_CTL_AST_OFS		= 0x20,		/* ofs from SHD_BLK_OFS */
+
+	/* SATA registers */
+	SATA_STATUS_OFS		= 0x300,  /* ctrl, err regs follow status */
+	SATA_ACTIVE_OFS		= 0x350,
+	PHY_MODE3		= 0x310,
+	PHY_MODE4		= 0x314,
+	PHY_MODE2		= 0x330,
+	MV5_PHY_MODE		= 0x74,
+	MV5_LT_MODE		= 0x30,
+	MV5_PHY_CTL		= 0x0C,
+	SATA_INTERFACE_CTL	= 0x050,
+
+	MV_M2_PREAMP_MASK	= 0x7e0,
+
+	/* Port registers */
+	EDMA_CFG_OFS		= 0,
+	EDMA_CFG_Q_DEPTH	= 0,			/* queueing disabled */
+	EDMA_CFG_NCQ		= (1 << 5),
+	EDMA_CFG_NCQ_GO_ON_ERR	= (1 << 14),		/* continue on error */
+	EDMA_CFG_RD_BRST_EXT	= (1 << 11),		/* read burst 512B */
+	EDMA_CFG_WR_BUFF_LEN	= (1 << 13),		/* write buffer 512B */
+
+	EDMA_ERR_IRQ_CAUSE_OFS	= 0x8,
+	EDMA_ERR_IRQ_MASK_OFS	= 0xc,
+	EDMA_ERR_D_PAR		= (1 << 0),
+	EDMA_ERR_PRD_PAR	= (1 << 1),
+	EDMA_ERR_DEV		= (1 << 2),
+	EDMA_ERR_DEV_DCON	= (1 << 3),
+	EDMA_ERR_DEV_CON	= (1 << 4),
+	EDMA_ERR_SERR		= (1 << 5),
+	EDMA_ERR_SELF_DIS	= (1 << 7),
+	EDMA_ERR_BIST_ASYNC	= (1 << 8),
+	EDMA_ERR_CRBQ_PAR	= (1 << 9),
+	EDMA_ERR_CRPB_PAR	= (1 << 10),
+	EDMA_ERR_INTRL_PAR	= (1 << 11),
+	EDMA_ERR_IORDY		= (1 << 12),
+	EDMA_ERR_LNK_CTRL_RX	= (0xf << 13),
+	EDMA_ERR_LNK_CTRL_RX_2	= (1 << 15),
+	EDMA_ERR_LNK_DATA_RX	= (0xf << 17),
+	EDMA_ERR_LNK_CTRL_TX	= (0x1f << 21),
+	EDMA_ERR_LNK_DATA_TX	= (0x1f << 26),
+	EDMA_ERR_TRANS_PROTO	= (1 << 31),
+	EDMA_ERR_FATAL		= (EDMA_ERR_D_PAR | EDMA_ERR_PRD_PAR |
+				   EDMA_ERR_DEV_DCON | EDMA_ERR_CRBQ_PAR |
+				   EDMA_ERR_CRPB_PAR | EDMA_ERR_INTRL_PAR |
+				   EDMA_ERR_IORDY | EDMA_ERR_LNK_CTRL_RX_2 |
+				   EDMA_ERR_LNK_DATA_RX |
+				   EDMA_ERR_LNK_DATA_TX |
+				   EDMA_ERR_TRANS_PROTO),
+
+	EDMA_REQ_Q_BASE_HI_OFS	= 0x10,
+	EDMA_REQ_Q_IN_PTR_OFS	= 0x14,		/* also contains BASE_LO */
+
+	EDMA_REQ_Q_OUT_PTR_OFS	= 0x18,
+	EDMA_REQ_Q_PTR_SHIFT	= 5,
+
+	EDMA_RSP_Q_BASE_HI_OFS	= 0x1c,
+	EDMA_RSP_Q_IN_PTR_OFS	= 0x20,
+	EDMA_RSP_Q_OUT_PTR_OFS	= 0x24,		/* also contains BASE_LO */
+	EDMA_RSP_Q_PTR_SHIFT	= 3,
+
+	EDMA_CMD_OFS		= 0x28,
+	EDMA_EN			= (1 << 0),
+	EDMA_DS			= (1 << 1),
+	ATA_RST			= (1 << 2),
+
+	EDMA_IORDY_TMOUT	= 0x34,
+	EDMA_ARB_CFG		= 0x38,
+
+	/* Host private flags (hp_flags) */
+	MV_HP_FLAG_MSI		= (1 << 0),
+	MV_HP_ERRATA_50XXB0	= (1 << 1),
+	MV_HP_ERRATA_50XXB2	= (1 << 2),
+	MV_HP_ERRATA_60X1B2	= (1 << 3),
+	MV_HP_ERRATA_60X1C0	= (1 << 4),
+	MV_HP_ERRATA_XX42A0	= (1 << 5),
+	MV_HP_50XX		= (1 << 6),
+	MV_HP_GEN_IIE		= (1 << 7),
+
+	/* Port private flags (pp_flags) */
+	MV_PP_FLAG_EDMA_EN	= (1 << 0),
+	MV_PP_FLAG_EDMA_DS_ACT	= (1 << 1),
+};
+
+#define IS_50XX(hpriv) ((hpriv)->hp_flags & MV_HP_50XX)
+#define IS_60XX(hpriv) (((hpriv)->hp_flags & MV_HP_50XX) == 0)
+#define IS_GEN_I(hpriv) IS_50XX(hpriv)
+#define IS_GEN_II(hpriv) IS_60XX(hpriv)
+#define IS_GEN_IIE(hpriv) ((hpriv)->hp_flags & MV_HP_GEN_IIE)
+
+enum {
+	/* Our DMA boundary is determined by an ePRD being unable to handle
+	 * anything larger than 64KB
+	 */
+	MV_DMA_BOUNDARY		= 0xffffU,
+
+	EDMA_REQ_Q_BASE_LO_MASK	= 0xfffffc00U,
+
+	EDMA_RSP_Q_BASE_LO_MASK	= 0xffffff00U,
+};
+
+enum chip_type {
+	chip_504x,
+	chip_508x,
+	chip_5080,
+	chip_604x,
+	chip_608x,
+	chip_6042,
+	chip_7042,
+};
+
+/* Command ReQuest Block: 32B */
+struct mv_crqb {
+	__le32			sg_addr;
+	__le32			sg_addr_hi;
+	__le16			ctrl_flags;
+	__le16			ata_cmd[11];
+};
+
+struct mv_crqb_iie {
+	__le32			addr;
+	__le32			addr_hi;
+	__le32			flags;
+	__le32			len;
+	__le32			ata_cmd[4];
+};
+
+/* Command ResPonse Block: 8B */
+struct mv_crpb {
+	__le16			id;
+	__le16			flags;
+	__le32			tmstmp;
+};
+
+/* EDMA Physical Region Descriptor (ePRD); A.K.A. SG */
+struct mv_sg {
+	__le32			addr;
+	__le32			flags_size;
+	__le32			addr_hi;
+	__le32			reserved;
+};
+
+struct mv_port_priv {
+	struct mv_crqb		*crqb;
+	dma_addr_t		crqb_dma;
+	struct mv_crpb		*crpb;
+	dma_addr_t		crpb_dma;
+	struct mv_sg		*sg_tbl;
+	dma_addr_t		sg_tbl_dma;
+	u32			pp_flags;
+};
+
+struct mv_port_signal {
+	u32			amps;
+	u32			pre;
+};
+
+struct mv_host_priv;
+struct mv_hw_ops {
+	void (*phy_errata)(struct mv_host_priv *hpriv, void __iomem *mmio,
+			   unsigned int port);
+	void (*enable_leds)(struct mv_host_priv *hpriv, void __iomem *mmio);
+	void (*read_preamp)(struct mv_host_priv *hpriv, int idx,
+			   void __iomem *mmio);
+	int (*reset_hc)(struct mv_host_priv *hpriv, void __iomem *mmio,
+			unsigned int n_hc);
+	void (*reset_flash)(struct mv_host_priv *hpriv, void __iomem *mmio);
+	void (*reset_bus)(struct pci_dev *pdev, void __iomem *mmio);
+};
+
+struct mv_host_priv {
+	u32			hp_flags;
+	struct mv_port_signal	signal[8];
+	const struct mv_hw_ops	*ops;
+};
+
+static void mv_irq_clear(struct ata_port *ap);
+static u32 mv_scr_read(struct ata_port *ap, unsigned int sc_reg_in);
+static void mv_scr_write(struct ata_port *ap, unsigned int sc_reg_in, u32 val);
+static u32 mv5_scr_read(struct ata_port *ap, unsigned int sc_reg_in);
+static void mv5_scr_write(struct ata_port *ap, unsigned int sc_reg_in, u32 val);
+static void mv_phy_reset(struct ata_port *ap);
+static void __mv_phy_reset(struct ata_port *ap, int can_sleep);
+static void mv_host_stop(struct ata_host_set *host_set);
+static int mv_port_start(struct ata_port *ap);
+static void mv_port_stop(struct ata_port *ap);
+static void mv_qc_prep(struct ata_queued_cmd *qc);
+static void mv_qc_prep_iie(struct ata_queued_cmd *qc);
+static unsigned int mv_qc_issue(struct ata_queued_cmd *qc);
+static irqreturn_t mv_interrupt(int irq, void *dev_instance,
+				struct pt_regs *regs);
+static void mv_eng_timeout(struct ata_port *ap);
+static int mv_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
+
+static void mv5_phy_errata(struct mv_host_priv *hpriv, void __iomem *mmio,
+			   unsigned int port);
+static void mv5_enable_leds(struct mv_host_priv *hpriv, void __iomem *mmio);
+static void mv5_read_preamp(struct mv_host_priv *hpriv, int idx,
+			   void __iomem *mmio);
+static int mv5_reset_hc(struct mv_host_priv *hpriv, void __iomem *mmio,
+			unsigned int n_hc);
+static void mv5_reset_flash(struct mv_host_priv *hpriv, void __iomem *mmio);
+static void mv5_reset_bus(struct pci_dev *pdev, void __iomem *mmio);
+
+static void mv6_phy_errata(struct mv_host_priv *hpriv, void __iomem *mmio,
+			   unsigned int port);
+static void mv6_enable_leds(struct mv_host_priv *hpriv, void __iomem *mmio);
+static void mv6_read_preamp(struct mv_host_priv *hpriv, int idx,
+			   void __iomem *mmio);
+static int mv6_reset_hc(struct mv_host_priv *hpriv, void __iomem *mmio,
+			unsigned int n_hc);
+static void mv6_reset_flash(struct mv_host_priv *hpriv, void __iomem *mmio);
+static void mv_reset_pci_bus(struct pci_dev *pdev, void __iomem *mmio);
+static void mv_channel_reset(struct mv_host_priv *hpriv, void __iomem *mmio,
+			     unsigned int port_no);
+static void mv_stop_and_reset(struct ata_port *ap);
+
+static struct scsi_host_template mv_sht = {
+	.module			= THIS_MODULE,
+	.name			= DRV_NAME,
+	.ioctl			= ata_scsi_ioctl,
+	.queuecommand		= ata_scsi_queuecmd,
+	.can_queue		= MV_USE_Q_DEPTH,
+	.this_id		= ATA_SHT_THIS_ID,
+	.sg_tablesize		= MV_MAX_SG_CT / 2,
+	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
+	.emulated		= ATA_SHT_EMULATED,
+	.use_clustering		= ATA_SHT_USE_CLUSTERING,
+	.proc_name		= DRV_NAME,
+	.dma_boundary		= MV_DMA_BOUNDARY,
+	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
+	.bios_param		= ata_std_bios_param,
+};
+
+static const struct ata_port_operations mv5_ops = {
+	.port_disable		= ata_port_disable,
+
+	.tf_load		= ata_tf_load,
+	.tf_read		= ata_tf_read,
+	.check_status		= ata_check_status,
+	.exec_command		= ata_exec_command,
+	.dev_select		= ata_std_dev_select,
+
+	.phy_reset		= mv_phy_reset,
+
+	.qc_prep		= mv_qc_prep,
+	.qc_issue		= mv_qc_issue,
+	.data_xfer		= ata_mmio_data_xfer,
+
+	.eng_timeout		= mv_eng_timeout,
+
+	.irq_handler		= mv_interrupt,
+	.irq_clear		= mv_irq_clear,
+
+	.scr_read		= mv5_scr_read,
+	.scr_write		= mv5_scr_write,
+
+	.port_start		= mv_port_start,
+	.port_stop		= mv_port_stop,
+	.host_stop		= mv_host_stop,
+};
+
+static const struct ata_port_operations mv6_ops = {
+	.port_disable		= ata_port_disable,
+
+	.tf_load		= ata_tf_load,
+	.tf_read		= ata_tf_read,
+	.check_status		= ata_check_status,
+	.exec_command		= ata_exec_command,
+	.dev_select		= ata_std_dev_select,
+
+	.phy_reset		= mv_phy_reset,
+
+	.qc_prep		= mv_qc_prep,
+	.qc_issue		= mv_qc_issue,
+	.data_xfer		= ata_mmio_data_xfer,
+
+	.eng_timeout		= mv_eng_timeout,
+
+	.irq_handler		= mv_interrupt,
+	.irq_clear		= mv_irq_clear,
+
+	.scr_read		= mv_scr_read,
+	.scr_write		= mv_scr_write,
+
+	.port_start		= mv_port_start,
+	.port_stop		= mv_port_stop,
+	.host_stop		= mv_host_stop,
+};
+
+static const struct ata_port_operations mv_iie_ops = {
+	.port_disable		= ata_port_disable,
+
+	.tf_load		= ata_tf_load,
+	.tf_read		= ata_tf_read,
+	.check_status		= ata_check_status,
+	.exec_command		= ata_exec_command,
+	.dev_select		= ata_std_dev_select,
+
+	.phy_reset		= mv_phy_reset,
+
+	.qc_prep		= mv_qc_prep_iie,
+	.qc_issue		= mv_qc_issue,
+
+	.eng_timeout		= mv_eng_timeout,
+
+	.irq_handler		= mv_interrupt,
+	.irq_clear		= mv_irq_clear,
+
+	.scr_read		= mv_scr_read,
+	.scr_write		= mv_scr_write,
+
+	.port_start		= mv_port_start,
+	.port_stop		= mv_port_stop,
+	.host_stop		= mv_host_stop,
+};
+
+static const struct ata_port_info mv_port_info[] = {
+	{  /* chip_504x */
+		.sht		= &mv_sht,
+		.host_flags	= MV_COMMON_FLAGS,
+		.pio_mask	= 0x1f,	/* pio0-4 */
+		.udma_mask	= 0x7f,	/* udma0-6 */
+		.port_ops	= &mv5_ops,
+	},
+	{  /* chip_508x */
+		.sht		= &mv_sht,
+		.host_flags	= (MV_COMMON_FLAGS | MV_FLAG_DUAL_HC),
+		.pio_mask	= 0x1f,	/* pio0-4 */
+		.udma_mask	= 0x7f,	/* udma0-6 */
+		.port_ops	= &mv5_ops,
+	},
+	{  /* chip_5080 */
+		.sht		= &mv_sht,
+		.host_flags	= (MV_COMMON_FLAGS | MV_FLAG_DUAL_HC),
+		.pio_mask	= 0x1f,	/* pio0-4 */
+		.udma_mask	= 0x7f,	/* udma0-6 */
+		.port_ops	= &mv5_ops,
+	},
+	{  /* chip_604x */
+		.sht		= &mv_sht,
+		.host_flags	= (MV_COMMON_FLAGS | MV_6XXX_FLAGS),
+		.pio_mask	= 0x1f,	/* pio0-4 */
+		.udma_mask	= 0x7f,	/* udma0-6 */
+		.port_ops	= &mv6_ops,
+	},
+	{  /* chip_608x */
+		.sht		= &mv_sht,
+		.host_flags	= (MV_COMMON_FLAGS | MV_6XXX_FLAGS |
+				   MV_FLAG_DUAL_HC),
+		.pio_mask	= 0x1f,	/* pio0-4 */
+		.udma_mask	= 0x7f,	/* udma0-6 */
+		.port_ops	= &mv6_ops,
+	},
+	{  /* chip_6042 */
+		.sht		= &mv_sht,
+		.host_flags	= (MV_COMMON_FLAGS | MV_6XXX_FLAGS),
+		.pio_mask	= 0x1f,	/* pio0-4 */
+		.udma_mask	= 0x7f,	/* udma0-6 */
+		.port_ops	= &mv_iie_ops,
+	},
+	{  /* chip_7042 */
+		.sht		= &mv_sht,
+		.host_flags	= (MV_COMMON_FLAGS | MV_6XXX_FLAGS |
+				   MV_FLAG_DUAL_HC),
+		.pio_mask	= 0x1f,	/* pio0-4 */
+		.udma_mask	= 0x7f,	/* udma0-6 */
+		.port_ops	= &mv_iie_ops,
+	},
+};
+
+static const struct pci_device_id mv_pci_tbl[] = {
+	{PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x5040), 0, 0, chip_504x},
+	{PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x5041), 0, 0, chip_504x},
+	{PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x5080), 0, 0, chip_5080},
+	{PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x5081), 0, 0, chip_508x},
+
+	{PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x6040), 0, 0, chip_604x},
+	{PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x6041), 0, 0, chip_604x},
+	{PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x6042), 0, 0, chip_6042},
+	{PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x6080), 0, 0, chip_608x},
+	{PCI_DEVICE(PCI_VENDOR_ID_MARVELL, 0x6081), 0, 0, chip_608x},
+
+	{PCI_DEVICE(PCI_VENDOR_ID_ADAPTEC2, 0x0241), 0, 0, chip_604x},
+	{}			/* terminate list */
+};
+
+static struct pci_driver mv_pci_driver = {
+	.name			= DRV_NAME,
+	.id_table		= mv_pci_tbl,
+	.probe			= mv_init_one,
+	.remove			= ata_pci_remove_one,
+};
+
+static const struct mv_hw_ops mv5xxx_ops = {
+	.phy_errata		= mv5_phy_errata,
+	.enable_leds		= mv5_enable_leds,
+	.read_preamp		= mv5_read_preamp,
+	.reset_hc		= mv5_reset_hc,
+	.reset_flash		= mv5_reset_flash,
+	.reset_bus		= mv5_reset_bus,
+};
+
+static const struct mv_hw_ops mv6xxx_ops = {
+	.phy_errata		= mv6_phy_errata,
+	.enable_leds		= mv6_enable_leds,
+	.read_preamp		= mv6_read_preamp,
+	.reset_hc		= mv6_reset_hc,
+	.reset_flash		= mv6_reset_flash,
+	.reset_bus		= mv_reset_pci_bus,
+};
+
+/*
+ * module options
+ */
+static int msi;	      /* Use PCI msi; either zero (off, default) or non-zero */
+
+
+/*
+ * Functions
+ */
+
+static inline void writelfl(unsigned long data, void __iomem *addr)
+{
+	writel(data, addr);
+	(void) readl(addr);	/* flush to avoid PCI posted write */
+}
+
+static inline void __iomem *mv_hc_base(void __iomem *base, unsigned int hc)
+{
+	return (base + MV_SATAHC0_REG_BASE + (hc * MV_SATAHC_REG_SZ));
+}
+
+static inline unsigned int mv_hc_from_port(unsigned int port)
+{
+	return port >> MV_PORT_HC_SHIFT;
+}
+
+static inline unsigned int mv_hardport_from_port(unsigned int port)
+{
+	return port & MV_PORT_MASK;
+}
+
+static inline void __iomem *mv_hc_base_from_port(void __iomem *base,
+						 unsigned int port)
+{
+	return mv_hc_base(base, mv_hc_from_port(port));
+}
+
+static inline void __iomem *mv_port_base(void __iomem *base, unsigned int port)
+{
+	return  mv_hc_base_from_port(base, port) +
+		MV_SATAHC_ARBTR_REG_SZ +
+		(mv_hardport_from_port(port) * MV_PORT_REG_SZ);
+}
+
+static inline void __iomem *mv_ap_base(struct ata_port *ap)
+{
+	return mv_port_base(ap->host_set->mmio_base, ap->port_no);
+}
+
+static inline int mv_get_hc_count(unsigned long host_flags)
+{
+	return ((host_flags & MV_FLAG_DUAL_HC) ? 2 : 1);
+}
+
+static void mv_irq_clear(struct ata_port *ap)
+{
+}
+
+/**
+ *      mv_start_dma - Enable eDMA engine
+ *      @base: port base address
+ *      @pp: port private data
+ *
+ *      Verify the local cache of the eDMA state is accurate with a
+ *      WARN_ON.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static void mv_start_dma(void __iomem *base, struct mv_port_priv *pp)
+{
+	if (!(MV_PP_FLAG_EDMA_EN & pp->pp_flags)) {
+		writelfl(EDMA_EN, base + EDMA_CMD_OFS);
+		pp->pp_flags |= MV_PP_FLAG_EDMA_EN;
+	}
+	WARN_ON(!(EDMA_EN & readl(base + EDMA_CMD_OFS)));
+}
+
+/**
+ *      mv_stop_dma - Disable eDMA engine
+ *      @ap: ATA channel to manipulate
+ *
+ *      Verify the local cache of the eDMA state is accurate with a
+ *      WARN_ON.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static void mv_stop_dma(struct ata_port *ap)
+{
+	void __iomem *port_mmio = mv_ap_base(ap);
+	struct mv_port_priv *pp	= ap->private_data;
+	u32 reg;
+	int i;
+
+	if (MV_PP_FLAG_EDMA_EN & pp->pp_flags) {
+		/* Disable EDMA if active.   The disable bit auto clears.
+		 */
+		writelfl(EDMA_DS, port_mmio + EDMA_CMD_OFS);
+		pp->pp_flags &= ~MV_PP_FLAG_EDMA_EN;
+	} else {
+		WARN_ON(EDMA_EN & readl(port_mmio + EDMA_CMD_OFS));
+  	}
+
+	/* now properly wait for the eDMA to stop */
+	for (i = 1000; i > 0; i--) {
+		reg = readl(port_mmio + EDMA_CMD_OFS);
+		if (!(EDMA_EN & reg)) {
+			break;
+		}
+		udelay(100);
+	}
+
+	if (EDMA_EN & reg) {
+		ata_port_printk(ap, KERN_ERR, "Unable to stop eDMA\n");
+		/* FIXME: Consider doing a reset here to recover */
+	}
+}
+
+#ifdef ATA_DEBUG
+static void mv_dump_mem(void __iomem *start, unsigned bytes)
+{
+	int b, w;
+	for (b = 0; b < bytes; ) {
+		DPRINTK("%p: ", start + b);
+		for (w = 0; b < bytes && w < 4; w++) {
+			printk("%08x ",readl(start + b));
+			b += sizeof(u32);
+		}
+		printk("\n");
+	}
+}
+#endif
+
+static void mv_dump_pci_cfg(struct pci_dev *pdev, unsigned bytes)
+{
+#ifdef ATA_DEBUG
+	int b, w;
+	u32 dw;
+	for (b = 0; b < bytes; ) {
+		DPRINTK("%02x: ", b);
+		for (w = 0; b < bytes && w < 4; w++) {
+			(void) pci_read_config_dword(pdev,b,&dw);
+			printk("%08x ",dw);
+			b += sizeof(u32);
+		}
+		printk("\n");
+	}
+#endif
+}
+static void mv_dump_all_regs(void __iomem *mmio_base, int port,
+			     struct pci_dev *pdev)
+{
+#ifdef ATA_DEBUG
+	void __iomem *hc_base = mv_hc_base(mmio_base,
+					   port >> MV_PORT_HC_SHIFT);
+	void __iomem *port_base;
+	int start_port, num_ports, p, start_hc, num_hcs, hc;
+
+	if (0 > port) {
+		start_hc = start_port = 0;
+		num_ports = 8;		/* shld be benign for 4 port devs */
+		num_hcs = 2;
+	} else {
+		start_hc = port >> MV_PORT_HC_SHIFT;
+		start_port = port;
+		num_ports = num_hcs = 1;
+	}
+	DPRINTK("All registers for port(s) %u-%u:\n", start_port,
+		num_ports > 1 ? num_ports - 1 : start_port);
+
+	if (NULL != pdev) {
+		DPRINTK("PCI config space regs:\n");
+		mv_dump_pci_cfg(pdev, 0x68);
+	}
+	DPRINTK("PCI regs:\n");
+	mv_dump_mem(mmio_base+0xc00, 0x3c);
+	mv_dump_mem(mmio_base+0xd00, 0x34);
+	mv_dump_mem(mmio_base+0xf00, 0x4);
+	mv_dump_mem(mmio_base+0x1d00, 0x6c);
+	for (hc = start_hc; hc < start_hc + num_hcs; hc++) {
+		hc_base = mv_hc_base(mmio_base, hc);
+		DPRINTK("HC regs (HC %i):\n", hc);
+		mv_dump_mem(hc_base, 0x1c);
+	}
+	for (p = start_port; p < start_port + num_ports; p++) {
+		port_base = mv_port_base(mmio_base, p);
+		DPRINTK("EDMA regs (port %i):\n",p);
+		mv_dump_mem(port_base, 0x54);
+		DPRINTK("SATA regs (port %i):\n",p);
+		mv_dump_mem(port_base+0x300, 0x60);
+	}
+#endif
+}
+
+static unsigned int mv_scr_offset(unsigned int sc_reg_in)
+{
+	unsigned int ofs;
+
+	switch (sc_reg_in) {
+	case SCR_STATUS:
+	case SCR_CONTROL:
+	case SCR_ERROR:
+		ofs = SATA_STATUS_OFS + (sc_reg_in * sizeof(u32));
+		break;
+	case SCR_ACTIVE:
+		ofs = SATA_ACTIVE_OFS;   /* active is not with the others */
+		break;
+	default:
+		ofs = 0xffffffffU;
+		break;
+	}
+	return ofs;
+}
+
+static u32 mv_scr_read(struct ata_port *ap, unsigned int sc_reg_in)
+{
+	unsigned int ofs = mv_scr_offset(sc_reg_in);
+
+	if (0xffffffffU != ofs) {
+		return readl(mv_ap_base(ap) + ofs);
+	} else {
+		return (u32) ofs;
+	}
+}
+
+static void mv_scr_write(struct ata_port *ap, unsigned int sc_reg_in, u32 val)
+{
+	unsigned int ofs = mv_scr_offset(sc_reg_in);
+
+	if (0xffffffffU != ofs) {
+		writelfl(val, mv_ap_base(ap) + ofs);
+	}
+}
+
+/**
+ *      mv_host_stop - Host specific cleanup/stop routine.
+ *      @host_set: host data structure
+ *
+ *      Disable ints, cleanup host memory, call general purpose
+ *      host_stop.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static void mv_host_stop(struct ata_host_set *host_set)
+{
+	struct mv_host_priv *hpriv = host_set->private_data;
+	struct pci_dev *pdev = to_pci_dev(host_set->dev);
+
+	if (hpriv->hp_flags & MV_HP_FLAG_MSI) {
+		pci_disable_msi(pdev);
+	} else {
+		pci_intx(pdev, 0);
+	}
+	kfree(hpriv);
+	ata_host_stop(host_set);
+}
+
+static inline void mv_priv_free(struct mv_port_priv *pp, struct device *dev)
+{
+	dma_free_coherent(dev, MV_PORT_PRIV_DMA_SZ, pp->crpb, pp->crpb_dma);
+}
+
+static void mv_edma_cfg(struct mv_host_priv *hpriv, void __iomem *port_mmio)
+{
+	u32 cfg = readl(port_mmio + EDMA_CFG_OFS);
+
+	/* set up non-NCQ EDMA configuration */
+	cfg &= ~0x1f;		/* clear queue depth */
+	cfg &= ~EDMA_CFG_NCQ;	/* clear NCQ mode */
+	cfg &= ~(1 << 9);	/* disable equeue */
+
+	if (IS_GEN_I(hpriv))
+		cfg |= (1 << 8);	/* enab config burst size mask */
+
+	else if (IS_GEN_II(hpriv))
+		cfg |= EDMA_CFG_RD_BRST_EXT | EDMA_CFG_WR_BUFF_LEN;
+
+	else if (IS_GEN_IIE(hpriv)) {
+		cfg |= (1 << 23);	/* dis RX PM port mask */
+		cfg &= ~(1 << 16);	/* dis FIS-based switching (for now) */
+		cfg &= ~(1 << 19);	/* dis 128-entry queue (for now?) */
+		cfg |= (1 << 18);	/* enab early completion */
+		cfg |= (1 << 17);	/* enab host q cache */
+		cfg |= (1 << 22);	/* enab cutthrough */
+	}
+
+	writelfl(cfg, port_mmio + EDMA_CFG_OFS);
+}
+
+/**
+ *      mv_port_start - Port specific init/start routine.
+ *      @ap: ATA channel to manipulate
+ *
+ *      Allocate and point to DMA memory, init port private memory,
+ *      zero indices.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static int mv_port_start(struct ata_port *ap)
+{
+	struct device *dev = ap->host_set->dev;
+	struct mv_host_priv *hpriv = ap->host_set->private_data;
+	struct mv_port_priv *pp;
+	void __iomem *port_mmio = mv_ap_base(ap);
+	void *mem;
+	dma_addr_t mem_dma;
+	int rc = -ENOMEM;
+
+	pp = kmalloc(sizeof(*pp), GFP_KERNEL);
+	if (!pp)
+		goto err_out;
+	memset(pp, 0, sizeof(*pp));
+
+	mem = dma_alloc_coherent(dev, MV_PORT_PRIV_DMA_SZ, &mem_dma,
+				 GFP_KERNEL);
+	if (!mem)
+		goto err_out_pp;
+	memset(mem, 0, MV_PORT_PRIV_DMA_SZ);
+
+	rc = ata_pad_alloc(ap, dev);
+	if (rc)
+		goto err_out_priv;
+
+	/* First item in chunk of DMA memory:
+	 * 32-slot command request table (CRQB), 32 bytes each in size
+	 */
+	pp->crqb = mem;
+	pp->crqb_dma = mem_dma;
+	mem += MV_CRQB_Q_SZ;
+	mem_dma += MV_CRQB_Q_SZ;
+
+	/* Second item:
+	 * 32-slot command response table (CRPB), 8 bytes each in size
+	 */
+	pp->crpb = mem;
+	pp->crpb_dma = mem_dma;
+	mem += MV_CRPB_Q_SZ;
+	mem_dma += MV_CRPB_Q_SZ;
+
+	/* Third item:
+	 * Table of scatter-gather descriptors (ePRD), 16 bytes each
+	 */
+	pp->sg_tbl = mem;
+	pp->sg_tbl_dma = mem_dma;
+
+	mv_edma_cfg(hpriv, port_mmio);
+
+	writel((pp->crqb_dma >> 16) >> 16, port_mmio + EDMA_REQ_Q_BASE_HI_OFS);
+	writelfl(pp->crqb_dma & EDMA_REQ_Q_BASE_LO_MASK,
+		 port_mmio + EDMA_REQ_Q_IN_PTR_OFS);
+
+	if (hpriv->hp_flags & MV_HP_ERRATA_XX42A0)
+		writelfl(pp->crqb_dma & 0xffffffff,
+			 port_mmio + EDMA_REQ_Q_OUT_PTR_OFS);
+	else
+		writelfl(0, port_mmio + EDMA_REQ_Q_OUT_PTR_OFS);
+
+	writel((pp->crpb_dma >> 16) >> 16, port_mmio + EDMA_RSP_Q_BASE_HI_OFS);
+
+	if (hpriv->hp_flags & MV_HP_ERRATA_XX42A0)
+		writelfl(pp->crpb_dma & 0xffffffff,
+			 port_mmio + EDMA_RSP_Q_IN_PTR_OFS);
+	else
+		writelfl(0, port_mmio + EDMA_RSP_Q_IN_PTR_OFS);
+
+	writelfl(pp->crpb_dma & EDMA_RSP_Q_BASE_LO_MASK,
+		 port_mmio + EDMA_RSP_Q_OUT_PTR_OFS);
+
+	/* Don't turn on EDMA here...do it before DMA commands only.  Else
+	 * we'll be unable to send non-data, PIO, etc due to restricted access
+	 * to shadow regs.
+	 */
+	ap->private_data = pp;
+	return 0;
+
+err_out_priv:
+	mv_priv_free(pp, dev);
+err_out_pp:
+	kfree(pp);
+err_out:
+	return rc;
+}
+
+/**
+ *      mv_port_stop - Port specific cleanup/stop routine.
+ *      @ap: ATA channel to manipulate
+ *
+ *      Stop DMA, cleanup port memory.
+ *
+ *      LOCKING:
+ *      This routine uses the host_set lock to protect the DMA stop.
+ */
+static void mv_port_stop(struct ata_port *ap)
+{
+	struct device *dev = ap->host_set->dev;
+	struct mv_port_priv *pp = ap->private_data;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ap->host_set->lock, flags);
+	mv_stop_dma(ap);
+	spin_unlock_irqrestore(&ap->host_set->lock, flags);
+
+	ap->private_data = NULL;
+	ata_pad_free(ap, dev);
+	mv_priv_free(pp, dev);
+	kfree(pp);
+}
+
+/**
+ *      mv_fill_sg - Fill out the Marvell ePRD (scatter gather) entries
+ *      @qc: queued command whose SG list to source from
+ *
+ *      Populate the SG list and mark the last entry.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static void mv_fill_sg(struct ata_queued_cmd *qc)
+{
+	struct mv_port_priv *pp = qc->ap->private_data;
+	unsigned int i = 0;
+	struct scatterlist *sg;
+
+	ata_for_each_sg(sg, qc) {
+		dma_addr_t addr;
+		u32 sg_len, len, offset;
+
+		addr = sg_dma_address(sg);
+		sg_len = sg_dma_len(sg);
+
+		while (sg_len) {
+			offset = addr & MV_DMA_BOUNDARY;
+			len = sg_len;
+			if ((offset + sg_len) > 0x10000)
+				len = 0x10000 - offset;
+
+			pp->sg_tbl[i].addr = cpu_to_le32(addr & 0xffffffff);
+			pp->sg_tbl[i].addr_hi = cpu_to_le32((addr >> 16) >> 16);
+			pp->sg_tbl[i].flags_size = cpu_to_le32(len & 0xffff);
+
+			sg_len -= len;
+			addr += len;
+
+			if (!sg_len && ata_sg_is_last(sg, qc))
+				pp->sg_tbl[i].flags_size |= cpu_to_le32(EPRD_FLAG_END_OF_TBL);
+
+			i++;
+		}
+	}
+}
+
+static inline unsigned mv_inc_q_index(unsigned index)
+{
+	return (index + 1) & MV_MAX_Q_DEPTH_MASK;
+}
+
+static inline void mv_crqb_pack_cmd(__le16 *cmdw, u8 data, u8 addr, unsigned last)
+{
+	u16 tmp = data | (addr << CRQB_CMD_ADDR_SHIFT) | CRQB_CMD_CS |
+		(last ? CRQB_CMD_LAST : 0);
+	*cmdw = cpu_to_le16(tmp);
+}
+
+/**
+ *      mv_qc_prep - Host specific command preparation.
+ *      @qc: queued command to prepare
+ *
+ *      This routine simply redirects to the general purpose routine
+ *      if command is not DMA.  Else, it handles prep of the CRQB
+ *      (command request block), does some sanity checking, and calls
+ *      the SG load routine.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static void mv_qc_prep(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct mv_port_priv *pp = ap->private_data;
+	__le16 *cw;
+	struct ata_taskfile *tf;
+	u16 flags = 0;
+	unsigned in_index;
+
+ 	if (ATA_PROT_DMA != qc->tf.protocol)
+		return;
+
+	/* Fill in command request block
+	 */
+	if (!(qc->tf.flags & ATA_TFLAG_WRITE))
+		flags |= CRQB_FLAG_READ;
+	WARN_ON(MV_MAX_Q_DEPTH <= qc->tag);
+	flags |= qc->tag << CRQB_TAG_SHIFT;
+
+	/* get current queue index from hardware */
+	in_index = (readl(mv_ap_base(ap) + EDMA_REQ_Q_IN_PTR_OFS)
+			>> EDMA_REQ_Q_PTR_SHIFT) & MV_MAX_Q_DEPTH_MASK;
+
+	pp->crqb[in_index].sg_addr =
+		cpu_to_le32(pp->sg_tbl_dma & 0xffffffff);
+	pp->crqb[in_index].sg_addr_hi =
+		cpu_to_le32((pp->sg_tbl_dma >> 16) >> 16);
+	pp->crqb[in_index].ctrl_flags = cpu_to_le16(flags);
+
+	cw = &pp->crqb[in_index].ata_cmd[0];
+	tf = &qc->tf;
+
+	/* Sadly, the CRQB cannot accomodate all registers--there are
+	 * only 11 bytes...so we must pick and choose required
+	 * registers based on the command.  So, we drop feature and
+	 * hob_feature for [RW] DMA commands, but they are needed for
+	 * NCQ.  NCQ will drop hob_nsect.
+	 */
+	switch (tf->command) {
+	case ATA_CMD_READ:
+	case ATA_CMD_READ_EXT:
+	case ATA_CMD_WRITE:
+	case ATA_CMD_WRITE_EXT:
+	case ATA_CMD_WRITE_FUA_EXT:
+		mv_crqb_pack_cmd(cw++, tf->hob_nsect, ATA_REG_NSECT, 0);
+		break;
+#ifdef LIBATA_NCQ		/* FIXME: remove this line when NCQ added */
+	case ATA_CMD_FPDMA_READ:
+	case ATA_CMD_FPDMA_WRITE:
+		mv_crqb_pack_cmd(cw++, tf->hob_feature, ATA_REG_FEATURE, 0);
+		mv_crqb_pack_cmd(cw++, tf->feature, ATA_REG_FEATURE, 0);
+		break;
+#endif				/* FIXME: remove this line when NCQ added */
+	default:
+		/* The only other commands EDMA supports in non-queued and
+		 * non-NCQ mode are: [RW] STREAM DMA and W DMA FUA EXT, none
+		 * of which are defined/used by Linux.  If we get here, this
+		 * driver needs work.
+		 *
+		 * FIXME: modify libata to give qc_prep a return value and
+		 * return error here.
+		 */
+		BUG_ON(tf->command);
+		break;
+	}
+	mv_crqb_pack_cmd(cw++, tf->nsect, ATA_REG_NSECT, 0);
+	mv_crqb_pack_cmd(cw++, tf->hob_lbal, ATA_REG_LBAL, 0);
+	mv_crqb_pack_cmd(cw++, tf->lbal, ATA_REG_LBAL, 0);
+	mv_crqb_pack_cmd(cw++, tf->hob_lbam, ATA_REG_LBAM, 0);
+	mv_crqb_pack_cmd(cw++, tf->lbam, ATA_REG_LBAM, 0);
+	mv_crqb_pack_cmd(cw++, tf->hob_lbah, ATA_REG_LBAH, 0);
+	mv_crqb_pack_cmd(cw++, tf->lbah, ATA_REG_LBAH, 0);
+	mv_crqb_pack_cmd(cw++, tf->device, ATA_REG_DEVICE, 0);
+	mv_crqb_pack_cmd(cw++, tf->command, ATA_REG_CMD, 1);	/* last */
+
+	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
+		return;
+	mv_fill_sg(qc);
+}
+
+/**
+ *      mv_qc_prep_iie - Host specific command preparation.
+ *      @qc: queued command to prepare
+ *
+ *      This routine simply redirects to the general purpose routine
+ *      if command is not DMA.  Else, it handles prep of the CRQB
+ *      (command request block), does some sanity checking, and calls
+ *      the SG load routine.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static void mv_qc_prep_iie(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct mv_port_priv *pp = ap->private_data;
+	struct mv_crqb_iie *crqb;
+	struct ata_taskfile *tf;
+	unsigned in_index;
+	u32 flags = 0;
+
+ 	if (ATA_PROT_DMA != qc->tf.protocol)
+		return;
+
+	/* Fill in Gen IIE command request block
+	 */
+	if (!(qc->tf.flags & ATA_TFLAG_WRITE))
+		flags |= CRQB_FLAG_READ;
+
+	WARN_ON(MV_MAX_Q_DEPTH <= qc->tag);
+	flags |= qc->tag << CRQB_TAG_SHIFT;
+
+	/* get current queue index from hardware */
+	in_index = (readl(mv_ap_base(ap) + EDMA_REQ_Q_IN_PTR_OFS)
+			>> EDMA_REQ_Q_PTR_SHIFT) & MV_MAX_Q_DEPTH_MASK;
+
+	crqb = (struct mv_crqb_iie *) &pp->crqb[in_index];
+	crqb->addr = cpu_to_le32(pp->sg_tbl_dma & 0xffffffff);
+	crqb->addr_hi = cpu_to_le32((pp->sg_tbl_dma >> 16) >> 16);
+	crqb->flags = cpu_to_le32(flags);
+
+	tf = &qc->tf;
+	crqb->ata_cmd[0] = cpu_to_le32(
+			(tf->command << 16) |
+			(tf->feature << 24)
+		);
+	crqb->ata_cmd[1] = cpu_to_le32(
+			(tf->lbal << 0) |
+			(tf->lbam << 8) |
+			(tf->lbah << 16) |
+			(tf->device << 24)
+		);
+	crqb->ata_cmd[2] = cpu_to_le32(
+			(tf->hob_lbal << 0) |
+			(tf->hob_lbam << 8) |
+			(tf->hob_lbah << 16) |
+			(tf->hob_feature << 24)
+		);
+	crqb->ata_cmd[3] = cpu_to_le32(
+			(tf->nsect << 0) |
+			(tf->hob_nsect << 8)
+		);
+
+	if (!(qc->flags & ATA_QCFLAG_DMAMAP))
+		return;
+	mv_fill_sg(qc);
+}
+
+/**
+ *      mv_qc_issue - Initiate a command to the host
+ *      @qc: queued command to start
+ *
+ *      This routine simply redirects to the general purpose routine
+ *      if command is not DMA.  Else, it sanity checks our local
+ *      caches of the request producer/consumer indices then enables
+ *      DMA and bumps the request producer index.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static unsigned int mv_qc_issue(struct ata_queued_cmd *qc)
+{
+	void __iomem *port_mmio = mv_ap_base(qc->ap);
+	struct mv_port_priv *pp = qc->ap->private_data;
+	unsigned in_index;
+	u32 in_ptr;
+
+	if (ATA_PROT_DMA != qc->tf.protocol) {
+		/* We're about to send a non-EDMA capable command to the
+		 * port.  Turn off EDMA so there won't be problems accessing
+		 * shadow block, etc registers.
+		 */
+		mv_stop_dma(qc->ap);
+		return ata_qc_issue_prot(qc);
+	}
+
+	in_ptr   = readl(port_mmio + EDMA_REQ_Q_IN_PTR_OFS);
+	in_index = (in_ptr >> EDMA_REQ_Q_PTR_SHIFT) & MV_MAX_Q_DEPTH_MASK;
+
+	/* until we do queuing, the queue should be empty at this point */
+	WARN_ON(in_index != ((readl(port_mmio + EDMA_REQ_Q_OUT_PTR_OFS)
+		>> EDMA_REQ_Q_PTR_SHIFT) & MV_MAX_Q_DEPTH_MASK));
+
+	in_index = mv_inc_q_index(in_index);	/* now incr producer index */
+
+	mv_start_dma(port_mmio, pp);
+
+	/* and write the request in pointer to kick the EDMA to life */
+	in_ptr &= EDMA_REQ_Q_BASE_LO_MASK;
+	in_ptr |= in_index << EDMA_REQ_Q_PTR_SHIFT;
+	writelfl(in_ptr, port_mmio + EDMA_REQ_Q_IN_PTR_OFS);
+
+	return 0;
+}
+
+/**
+ *      mv_get_crpb_status - get status from most recently completed cmd
+ *      @ap: ATA channel to manipulate
+ *
+ *      This routine is for use when the port is in DMA mode, when it
+ *      will be using the CRPB (command response block) method of
+ *      returning command completion information.  We check indices
+ *      are good, grab status, and bump the response consumer index to
+ *      prove that we're up to date.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static u8 mv_get_crpb_status(struct ata_port *ap)
+{
+	void __iomem *port_mmio = mv_ap_base(ap);
+	struct mv_port_priv *pp = ap->private_data;
+	unsigned out_index;
+	u32 out_ptr;
+	u8 ata_status;
+
+	out_ptr   = readl(port_mmio + EDMA_RSP_Q_OUT_PTR_OFS);
+	out_index = (out_ptr >> EDMA_RSP_Q_PTR_SHIFT) & MV_MAX_Q_DEPTH_MASK;
+
+	ata_status = le16_to_cpu(pp->crpb[out_index].flags)
+					>> CRPB_FLAG_STATUS_SHIFT;
+
+	/* increment our consumer index... */
+	out_index = mv_inc_q_index(out_index);
+
+	/* and, until we do NCQ, there should only be 1 CRPB waiting */
+	WARN_ON(out_index != ((readl(port_mmio + EDMA_RSP_Q_IN_PTR_OFS)
+		>> EDMA_RSP_Q_PTR_SHIFT) & MV_MAX_Q_DEPTH_MASK));
+
+	/* write out our inc'd consumer index so EDMA knows we're caught up */
+	out_ptr &= EDMA_RSP_Q_BASE_LO_MASK;
+	out_ptr |= out_index << EDMA_RSP_Q_PTR_SHIFT;
+	writelfl(out_ptr, port_mmio + EDMA_RSP_Q_OUT_PTR_OFS);
+
+	/* Return ATA status register for completed CRPB */
+	return ata_status;
+}
+
+/**
+ *      mv_err_intr - Handle error interrupts on the port
+ *      @ap: ATA channel to manipulate
+ *      @reset_allowed: bool: 0 == don't trigger from reset here
+ *
+ *      In most cases, just clear the interrupt and move on.  However,
+ *      some cases require an eDMA reset, which is done right before
+ *      the COMRESET in mv_phy_reset().  The SERR case requires a
+ *      clear of pending errors in the SATA SERROR register.  Finally,
+ *      if the port disabled DMA, update our cached copy to match.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static void mv_err_intr(struct ata_port *ap, int reset_allowed)
+{
+	void __iomem *port_mmio = mv_ap_base(ap);
+	u32 edma_err_cause, serr = 0;
+
+	edma_err_cause = readl(port_mmio + EDMA_ERR_IRQ_CAUSE_OFS);
+
+	if (EDMA_ERR_SERR & edma_err_cause) {
+		sata_scr_read(ap, SCR_ERROR, &serr);
+		sata_scr_write_flush(ap, SCR_ERROR, serr);
+	}
+	if (EDMA_ERR_SELF_DIS & edma_err_cause) {
+		struct mv_port_priv *pp	= ap->private_data;
+		pp->pp_flags &= ~MV_PP_FLAG_EDMA_EN;
+	}
+	DPRINTK(KERN_ERR "ata%u: port error; EDMA err cause: 0x%08x "
+		"SERR: 0x%08x\n", ap->id, edma_err_cause, serr);
+
+	/* Clear EDMA now that SERR cleanup done */
+	writelfl(0, port_mmio + EDMA_ERR_IRQ_CAUSE_OFS);
+
+	/* check for fatal here and recover if needed */
+	if (reset_allowed && (EDMA_ERR_FATAL & edma_err_cause))
+		mv_stop_and_reset(ap);
+}
+
+/**
+ *      mv_host_intr - Handle all interrupts on the given host controller
+ *      @host_set: host specific structure
+ *      @relevant: port error bits relevant to this host controller
+ *      @hc: which host controller we're to look at
+ *
+ *      Read then write clear the HC interrupt status then walk each
+ *      port connected to the HC and see if it needs servicing.  Port
+ *      success ints are reported in the HC interrupt status reg, the
+ *      port error ints are reported in the higher level main
+ *      interrupt status register and thus are passed in via the
+ *      'relevant' argument.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static void mv_host_intr(struct ata_host_set *host_set, u32 relevant,
+			 unsigned int hc)
+{
+	void __iomem *mmio = host_set->mmio_base;
+	void __iomem *hc_mmio = mv_hc_base(mmio, hc);
+	struct ata_queued_cmd *qc;
+	u32 hc_irq_cause;
+	int shift, port, port0, hard_port, handled;
+	unsigned int err_mask;
+
+	if (hc == 0) {
+		port0 = 0;
+	} else {
+		port0 = MV_PORTS_PER_HC;
+	}
+
+	/* we'll need the HC success int register in most cases */
+	hc_irq_cause = readl(hc_mmio + HC_IRQ_CAUSE_OFS);
+	if (hc_irq_cause) {
+		writelfl(~hc_irq_cause, hc_mmio + HC_IRQ_CAUSE_OFS);
+	}
+
+	VPRINTK("ENTER, hc%u relevant=0x%08x HC IRQ cause=0x%08x\n",
+		hc,relevant,hc_irq_cause);
+
+	for (port = port0; port < port0 + MV_PORTS_PER_HC; port++) {
+		u8 ata_status = 0;
+		struct ata_port *ap = host_set->ports[port];
+		struct mv_port_priv *pp = ap->private_data;
+
+		hard_port = mv_hardport_from_port(port); /* range 0..3 */
+		handled = 0;	/* ensure ata_status is set if handled++ */
+
+		/* Note that DEV_IRQ might happen spuriously during EDMA,
+		 * and should be ignored in such cases.
+		 * The cause of this is still under investigation.
+		 */
+		if (pp->pp_flags & MV_PP_FLAG_EDMA_EN) {
+			/* EDMA: check for response queue interrupt */
+			if ((CRPB_DMA_DONE << hard_port) & hc_irq_cause) {
+				ata_status = mv_get_crpb_status(ap);
+				handled = 1;
+			}
+		} else {
+			/* PIO: check for device (drive) interrupt */
+			if ((DEV_IRQ << hard_port) & hc_irq_cause) {
+				ata_status = readb((void __iomem *)
+					   ap->ioaddr.status_addr);
+				handled = 1;
+				/* ignore spurious intr if drive still BUSY */
+				if (ata_status & ATA_BUSY) {
+					ata_status = 0;
+					handled = 0;
+				}
+			}
+		}
+
+		if (ap && (ap->flags & ATA_FLAG_DISABLED))
+			continue;
+
+		err_mask = ac_err_mask(ata_status);
+
+		shift = port << 1;		/* (port * 2) */
+		if (port >= MV_PORTS_PER_HC) {
+			shift++;	/* skip bit 8 in the HC Main IRQ reg */
+		}
+		if ((PORT0_ERR << shift) & relevant) {
+			mv_err_intr(ap, 1);
+			err_mask |= AC_ERR_OTHER;
+			handled = 1;
+		}
+
+		if (handled) {
+			qc = ata_qc_from_tag(ap, ap->active_tag);
+			if (qc && (qc->flags & ATA_QCFLAG_ACTIVE)) {
+				VPRINTK("port %u IRQ found for qc, "
+					"ata_status 0x%x\n", port,ata_status);
+				/* mark qc status appropriately */
+				if (!(qc->tf.flags & ATA_TFLAG_POLLING)) {
+					qc->err_mask |= err_mask;
+					ata_qc_complete(qc);
+				}
+			}
+		}
+	}
+	VPRINTK("EXIT\n");
+}
+
+/**
+ *      mv_interrupt -
+ *      @irq: unused
+ *      @dev_instance: private data; in this case the host structure
+ *      @regs: unused
+ *
+ *      Read the read only register to determine if any host
+ *      controllers have pending interrupts.  If so, call lower level
+ *      routine to handle.  Also check for PCI errors which are only
+ *      reported here.
+ *
+ *      LOCKING:
+ *      This routine holds the host_set lock while processing pending
+ *      interrupts.
+ */
+static irqreturn_t mv_interrupt(int irq, void *dev_instance,
+				struct pt_regs *regs)
+{
+	struct ata_host_set *host_set = dev_instance;
+	unsigned int hc, handled = 0, n_hcs;
+	void __iomem *mmio = host_set->mmio_base;
+	struct mv_host_priv *hpriv;
+	u32 irq_stat;
+
+	irq_stat = readl(mmio + HC_MAIN_IRQ_CAUSE_OFS);
+
+	/* check the cases where we either have nothing pending or have read
+	 * a bogus register value which can indicate HW removal or PCI fault
+	 */
+	if (!irq_stat || (0xffffffffU == irq_stat)) {
+		return IRQ_NONE;
+	}
+
+	n_hcs = mv_get_hc_count(host_set->ports[0]->flags);
+	spin_lock(&host_set->lock);
+
+	for (hc = 0; hc < n_hcs; hc++) {
+		u32 relevant = irq_stat & (HC0_IRQ_PEND << (hc * HC_SHIFT));
+		if (relevant) {
+			mv_host_intr(host_set, relevant, hc);
+			handled++;
+		}
+	}
+
+	hpriv = host_set->private_data;
+	if (IS_60XX(hpriv)) {
+		/* deal with the interrupt coalescing bits */
+		if (irq_stat & (TRAN_LO_DONE | TRAN_HI_DONE | PORTS_0_7_COAL_DONE)) {
+			writelfl(0, mmio + MV_IRQ_COAL_CAUSE_LO);
+			writelfl(0, mmio + MV_IRQ_COAL_CAUSE_HI);
+			writelfl(0, mmio + MV_IRQ_COAL_CAUSE);
+		}
+	}
+
+	if (PCI_ERR & irq_stat) {
+		printk(KERN_ERR DRV_NAME ": PCI ERROR; PCI IRQ cause=0x%08x\n",
+		       readl(mmio + PCI_IRQ_CAUSE_OFS));
+
+		DPRINTK("All regs @ PCI error\n");
+		mv_dump_all_regs(mmio, -1, to_pci_dev(host_set->dev));
+
+		writelfl(0, mmio + PCI_IRQ_CAUSE_OFS);
+		handled++;
+	}
+	spin_unlock(&host_set->lock);
+
+	return IRQ_RETVAL(handled);
+}
+
+static void __iomem *mv5_phy_base(void __iomem *mmio, unsigned int port)
+{
+	void __iomem *hc_mmio = mv_hc_base_from_port(mmio, port);
+	unsigned long ofs = (mv_hardport_from_port(port) + 1) * 0x100UL;
+
+	return hc_mmio + ofs;
+}
+
+static unsigned int mv5_scr_offset(unsigned int sc_reg_in)
+{
+	unsigned int ofs;
+
+	switch (sc_reg_in) {
+	case SCR_STATUS:
+	case SCR_ERROR:
+	case SCR_CONTROL:
+		ofs = sc_reg_in * sizeof(u32);
+		break;
+	default:
+		ofs = 0xffffffffU;
+		break;
+	}
+	return ofs;
+}
+
+static u32 mv5_scr_read(struct ata_port *ap, unsigned int sc_reg_in)
+{
+	void __iomem *mmio = mv5_phy_base(ap->host_set->mmio_base, ap->port_no);
+	unsigned int ofs = mv5_scr_offset(sc_reg_in);
+
+	if (ofs != 0xffffffffU)
+		return readl(mmio + ofs);
+	else
+		return (u32) ofs;
+}
+
+static void mv5_scr_write(struct ata_port *ap, unsigned int sc_reg_in, u32 val)
+{
+	void __iomem *mmio = mv5_phy_base(ap->host_set->mmio_base, ap->port_no);
+	unsigned int ofs = mv5_scr_offset(sc_reg_in);
+
+	if (ofs != 0xffffffffU)
+		writelfl(val, mmio + ofs);
+}
+
+static void mv5_reset_bus(struct pci_dev *pdev, void __iomem *mmio)
+{
+	u8 rev_id;
+	int early_5080;
+
+	pci_read_config_byte(pdev, PCI_REVISION_ID, &rev_id);
+
+	early_5080 = (pdev->device == 0x5080) && (rev_id == 0);
+
+	if (!early_5080) {
+		u32 tmp = readl(mmio + MV_PCI_EXP_ROM_BAR_CTL);
+		tmp |= (1 << 0);
+		writel(tmp, mmio + MV_PCI_EXP_ROM_BAR_CTL);
+	}
+
+	mv_reset_pci_bus(pdev, mmio);
+}
+
+static void mv5_reset_flash(struct mv_host_priv *hpriv, void __iomem *mmio)
+{
+	writel(0x0fcfffff, mmio + MV_FLASH_CTL);
+}
+
+static void mv5_read_preamp(struct mv_host_priv *hpriv, int idx,
+			   void __iomem *mmio)
+{
+	void __iomem *phy_mmio = mv5_phy_base(mmio, idx);
+	u32 tmp;
+
+	tmp = readl(phy_mmio + MV5_PHY_MODE);
+
+	hpriv->signal[idx].pre = tmp & 0x1800;	/* bits 12:11 */
+	hpriv->signal[idx].amps = tmp & 0xe0;	/* bits 7:5 */
+}
+
+static void mv5_enable_leds(struct mv_host_priv *hpriv, void __iomem *mmio)
+{
+	u32 tmp;
+
+	writel(0, mmio + MV_GPIO_PORT_CTL);
+
+	/* FIXME: handle MV_HP_ERRATA_50XXB2 errata */
+
+	tmp = readl(mmio + MV_PCI_EXP_ROM_BAR_CTL);
+	tmp |= ~(1 << 0);
+	writel(tmp, mmio + MV_PCI_EXP_ROM_BAR_CTL);
+}
+
+static void mv5_phy_errata(struct mv_host_priv *hpriv, void __iomem *mmio,
+			   unsigned int port)
+{
+	void __iomem *phy_mmio = mv5_phy_base(mmio, port);
+	const u32 mask = (1<<12) | (1<<11) | (1<<7) | (1<<6) | (1<<5);
+	u32 tmp;
+	int fix_apm_sq = (hpriv->hp_flags & MV_HP_ERRATA_50XXB0);
+
+	if (fix_apm_sq) {
+		tmp = readl(phy_mmio + MV5_LT_MODE);
+		tmp |= (1 << 19);
+		writel(tmp, phy_mmio + MV5_LT_MODE);
+
+		tmp = readl(phy_mmio + MV5_PHY_CTL);
+		tmp &= ~0x3;
+		tmp |= 0x1;
+		writel(tmp, phy_mmio + MV5_PHY_CTL);
+	}
+
+	tmp = readl(phy_mmio + MV5_PHY_MODE);
+	tmp &= ~mask;
+	tmp |= hpriv->signal[port].pre;
+	tmp |= hpriv->signal[port].amps;
+	writel(tmp, phy_mmio + MV5_PHY_MODE);
+}
+
+
+#undef ZERO
+#define ZERO(reg) writel(0, port_mmio + (reg))
+static void mv5_reset_hc_port(struct mv_host_priv *hpriv, void __iomem *mmio,
+			     unsigned int port)
+{
+	void __iomem *port_mmio = mv_port_base(mmio, port);
+
+	writelfl(EDMA_DS, port_mmio + EDMA_CMD_OFS);
+
+	mv_channel_reset(hpriv, mmio, port);
+
+	ZERO(0x028);	/* command */
+	writel(0x11f, port_mmio + EDMA_CFG_OFS);
+	ZERO(0x004);	/* timer */
+	ZERO(0x008);	/* irq err cause */
+	ZERO(0x00c);	/* irq err mask */
+	ZERO(0x010);	/* rq bah */
+	ZERO(0x014);	/* rq inp */
+	ZERO(0x018);	/* rq outp */
+	ZERO(0x01c);	/* respq bah */
+	ZERO(0x024);	/* respq outp */
+	ZERO(0x020);	/* respq inp */
+	ZERO(0x02c);	/* test control */
+	writel(0xbc, port_mmio + EDMA_IORDY_TMOUT);
+}
+#undef ZERO
+
+#define ZERO(reg) writel(0, hc_mmio + (reg))
+static void mv5_reset_one_hc(struct mv_host_priv *hpriv, void __iomem *mmio,
+			unsigned int hc)
+{
+	void __iomem *hc_mmio = mv_hc_base(mmio, hc);
+	u32 tmp;
+
+	ZERO(0x00c);
+	ZERO(0x010);
+	ZERO(0x014);
+	ZERO(0x018);
+
+	tmp = readl(hc_mmio + 0x20);
+	tmp &= 0x1c1c1c1c;
+	tmp |= 0x03030303;
+	writel(tmp, hc_mmio + 0x20);
+}
+#undef ZERO
+
+static int mv5_reset_hc(struct mv_host_priv *hpriv, void __iomem *mmio,
+			unsigned int n_hc)
+{
+	unsigned int hc, port;
+
+	for (hc = 0; hc < n_hc; hc++) {
+		for (port = 0; port < MV_PORTS_PER_HC; port++)
+			mv5_reset_hc_port(hpriv, mmio,
+					  (hc * MV_PORTS_PER_HC) + port);
+
+		mv5_reset_one_hc(hpriv, mmio, hc);
+	}
+
+	return 0;
+}
+
+#undef ZERO
+#define ZERO(reg) writel(0, mmio + (reg))
+static void mv_reset_pci_bus(struct pci_dev *pdev, void __iomem *mmio)
+{
+	u32 tmp;
+
+	tmp = readl(mmio + MV_PCI_MODE);
+	tmp &= 0xff00ffff;
+	writel(tmp, mmio + MV_PCI_MODE);
+
+	ZERO(MV_PCI_DISC_TIMER);
+	ZERO(MV_PCI_MSI_TRIGGER);
+	writel(0x000100ff, mmio + MV_PCI_XBAR_TMOUT);
+	ZERO(HC_MAIN_IRQ_MASK_OFS);
+	ZERO(MV_PCI_SERR_MASK);
+	ZERO(PCI_IRQ_CAUSE_OFS);
+	ZERO(PCI_IRQ_MASK_OFS);
+	ZERO(MV_PCI_ERR_LOW_ADDRESS);
+	ZERO(MV_PCI_ERR_HIGH_ADDRESS);
+	ZERO(MV_PCI_ERR_ATTRIBUTE);
+	ZERO(MV_PCI_ERR_COMMAND);
+}
+#undef ZERO
+
+static void mv6_reset_flash(struct mv_host_priv *hpriv, void __iomem *mmio)
+{
+	u32 tmp;
+
+	mv5_reset_flash(hpriv, mmio);
+
+	tmp = readl(mmio + MV_GPIO_PORT_CTL);
+	tmp &= 0x3;
+	tmp |= (1 << 5) | (1 << 6);
+	writel(tmp, mmio + MV_GPIO_PORT_CTL);
+}
+
+/**
+ *      mv6_reset_hc - Perform the 6xxx global soft reset
+ *      @mmio: base address of the HBA
+ *
+ *      This routine only applies to 6xxx parts.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static int mv6_reset_hc(struct mv_host_priv *hpriv, void __iomem *mmio,
+			unsigned int n_hc)
+{
+	void __iomem *reg = mmio + PCI_MAIN_CMD_STS_OFS;
+	int i, rc = 0;
+	u32 t;
+
+	/* Following procedure defined in PCI "main command and status
+	 * register" table.
+	 */
+	t = readl(reg);
+	writel(t | STOP_PCI_MASTER, reg);
+
+	for (i = 0; i < 1000; i++) {
+		udelay(1);
+		t = readl(reg);
+		if (PCI_MASTER_EMPTY & t) {
+			break;
+		}
+	}
+	if (!(PCI_MASTER_EMPTY & t)) {
+		printk(KERN_ERR DRV_NAME ": PCI master won't flush\n");
+		rc = 1;
+		goto done;
+	}
+
+	/* set reset */
+	i = 5;
+	do {
+		writel(t | GLOB_SFT_RST, reg);
+		t = readl(reg);
+		udelay(1);
+	} while (!(GLOB_SFT_RST & t) && (i-- > 0));
+
+	if (!(GLOB_SFT_RST & t)) {
+		printk(KERN_ERR DRV_NAME ": can't set global reset\n");
+		rc = 1;
+		goto done;
+	}
+
+	/* clear reset and *reenable the PCI master* (not mentioned in spec) */
+	i = 5;
+	do {
+		writel(t & ~(GLOB_SFT_RST | STOP_PCI_MASTER), reg);
+		t = readl(reg);
+		udelay(1);
+	} while ((GLOB_SFT_RST & t) && (i-- > 0));
+
+	if (GLOB_SFT_RST & t) {
+		printk(KERN_ERR DRV_NAME ": can't clear global reset\n");
+		rc = 1;
+	}
+done:
+	return rc;
+}
+
+static void mv6_read_preamp(struct mv_host_priv *hpriv, int idx,
+			   void __iomem *mmio)
+{
+	void __iomem *port_mmio;
+	u32 tmp;
+
+	tmp = readl(mmio + MV_RESET_CFG);
+	if ((tmp & (1 << 0)) == 0) {
+		hpriv->signal[idx].amps = 0x7 << 8;
+		hpriv->signal[idx].pre = 0x1 << 5;
+		return;
+	}
+
+	port_mmio = mv_port_base(mmio, idx);
+	tmp = readl(port_mmio + PHY_MODE2);
+
+	hpriv->signal[idx].amps = tmp & 0x700;	/* bits 10:8 */
+	hpriv->signal[idx].pre = tmp & 0xe0;	/* bits 7:5 */
+}
+
+static void mv6_enable_leds(struct mv_host_priv *hpriv, void __iomem *mmio)
+{
+	writel(0x00000060, mmio + MV_GPIO_PORT_CTL);
+}
+
+static void mv6_phy_errata(struct mv_host_priv *hpriv, void __iomem *mmio,
+			   unsigned int port)
+{
+	void __iomem *port_mmio = mv_port_base(mmio, port);
+
+	u32 hp_flags = hpriv->hp_flags;
+	int fix_phy_mode2 =
+		hp_flags & (MV_HP_ERRATA_60X1B2 | MV_HP_ERRATA_60X1C0);
+	int fix_phy_mode4 =
+		hp_flags & (MV_HP_ERRATA_60X1B2 | MV_HP_ERRATA_60X1C0);
+	u32 m2, tmp;
+
+	if (fix_phy_mode2) {
+		m2 = readl(port_mmio + PHY_MODE2);
+		m2 &= ~(1 << 16);
+		m2 |= (1 << 31);
+		writel(m2, port_mmio + PHY_MODE2);
+
+		udelay(200);
+
+		m2 = readl(port_mmio + PHY_MODE2);
+		m2 &= ~((1 << 16) | (1 << 31));
+		writel(m2, port_mmio + PHY_MODE2);
+
+		udelay(200);
+	}
+
+	/* who knows what this magic does */
+	tmp = readl(port_mmio + PHY_MODE3);
+	tmp &= ~0x7F800000;
+	tmp |= 0x2A800000;
+	writel(tmp, port_mmio + PHY_MODE3);
+
+	if (fix_phy_mode4) {
+		u32 m4;
+
+		m4 = readl(port_mmio + PHY_MODE4);
+
+		if (hp_flags & MV_HP_ERRATA_60X1B2)
+			tmp = readl(port_mmio + 0x310);
+
+		m4 = (m4 & ~(1 << 1)) | (1 << 0);
+
+		writel(m4, port_mmio + PHY_MODE4);
+
+		if (hp_flags & MV_HP_ERRATA_60X1B2)
+			writel(tmp, port_mmio + 0x310);
+	}
+
+	/* Revert values of pre-emphasis and signal amps to the saved ones */
+	m2 = readl(port_mmio + PHY_MODE2);
+
+	m2 &= ~MV_M2_PREAMP_MASK;
+	m2 |= hpriv->signal[port].amps;
+	m2 |= hpriv->signal[port].pre;
+	m2 &= ~(1 << 16);
+
+	/* according to mvSata 3.6.1, some IIE values are fixed */
+	if (IS_GEN_IIE(hpriv)) {
+		m2 &= ~0xC30FF01F;
+		m2 |= 0x0000900F;
+	}
+
+	writel(m2, port_mmio + PHY_MODE2);
+}
+
+static void mv_channel_reset(struct mv_host_priv *hpriv, void __iomem *mmio,
+			     unsigned int port_no)
+{
+	void __iomem *port_mmio = mv_port_base(mmio, port_no);
+
+	writelfl(ATA_RST, port_mmio + EDMA_CMD_OFS);
+
+	if (IS_60XX(hpriv)) {
+		u32 ifctl = readl(port_mmio + SATA_INTERFACE_CTL);
+		ifctl |= (1 << 7);		/* enable gen2i speed */
+		ifctl = (ifctl & 0xfff) | 0x9b1000; /* from chip spec */
+		writelfl(ifctl, port_mmio + SATA_INTERFACE_CTL);
+	}
+
+	udelay(25);		/* allow reset propagation */
+
+	/* Spec never mentions clearing the bit.  Marvell's driver does
+	 * clear the bit, however.
+	 */
+	writelfl(0, port_mmio + EDMA_CMD_OFS);
+
+	hpriv->ops->phy_errata(hpriv, mmio, port_no);
+
+	if (IS_50XX(hpriv))
+		mdelay(1);
+}
+
+static void mv_stop_and_reset(struct ata_port *ap)
+{
+	struct mv_host_priv *hpriv = ap->host_set->private_data;
+	void __iomem *mmio = ap->host_set->mmio_base;
+
+	mv_stop_dma(ap);
+
+	mv_channel_reset(hpriv, mmio, ap->port_no);
+
+	__mv_phy_reset(ap, 0);
+}
+
+static inline void __msleep(unsigned int msec, int can_sleep)
+{
+	if (can_sleep)
+		msleep(msec);
+	else
+		mdelay(msec);
+}
+
+/**
+ *      __mv_phy_reset - Perform eDMA reset followed by COMRESET
+ *      @ap: ATA channel to manipulate
+ *
+ *      Part of this is taken from __sata_phy_reset and modified to
+ *      not sleep since this routine gets called from interrupt level.
+ *
+ *      LOCKING:
+ *      Inherited from caller.  This is coded to safe to call at
+ *      interrupt level, i.e. it does not sleep.
+ */
+static void __mv_phy_reset(struct ata_port *ap, int can_sleep)
+{
+	struct mv_port_priv *pp	= ap->private_data;
+	struct mv_host_priv *hpriv = ap->host_set->private_data;
+	void __iomem *port_mmio = mv_ap_base(ap);
+	struct ata_taskfile tf;
+	struct ata_device *dev = &ap->device[0];
+	unsigned long timeout;
+	int retry = 5;
+	u32 sstatus;
+
+	VPRINTK("ENTER, port %u, mmio 0x%p\n", ap->port_no, port_mmio);
+
+	DPRINTK("S-regs after ATA_RST: SStat 0x%08x SErr 0x%08x "
+		"SCtrl 0x%08x\n", mv_scr_read(ap, SCR_STATUS),
+		mv_scr_read(ap, SCR_ERROR), mv_scr_read(ap, SCR_CONTROL));
+
+	/* Issue COMRESET via SControl */
+comreset_retry:
+	sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
+	__msleep(1, can_sleep);
+
+	sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
+	__msleep(20, can_sleep);
+
+	timeout = jiffies + msecs_to_jiffies(200);
+	do {
+		sata_scr_read(ap, SCR_STATUS, &sstatus);
+		sstatus &= 0x3;
+		if ((sstatus == 3) || (sstatus == 0))
+			break;
+
+		__msleep(1, can_sleep);
+	} while (time_before(jiffies, timeout));
+
+	/* work around errata */
+	if (IS_60XX(hpriv) &&
+	    (sstatus != 0x0) && (sstatus != 0x113) && (sstatus != 0x123) &&
+	    (retry-- > 0))
+		goto comreset_retry;
+
+	DPRINTK("S-regs after PHY wake: SStat 0x%08x SErr 0x%08x "
+		"SCtrl 0x%08x\n", mv_scr_read(ap, SCR_STATUS),
+		mv_scr_read(ap, SCR_ERROR), mv_scr_read(ap, SCR_CONTROL));
+
+	if (ata_port_online(ap)) {
+		ata_port_probe(ap);
+	} else {
+		sata_scr_read(ap, SCR_STATUS, &sstatus);
+		ata_port_printk(ap, KERN_INFO,
+				"no device found (phy stat %08x)\n", sstatus);
+		ata_port_disable(ap);
+		return;
+	}
+	ap->cbl = ATA_CBL_SATA;
+
+	/* even after SStatus reflects that device is ready,
+	 * it seems to take a while for link to be fully
+	 * established (and thus Status no longer 0x80/0x7F),
+	 * so we poll a bit for that, here.
+	 */
+	retry = 20;
+	while (1) {
+		u8 drv_stat = ata_check_status(ap);
+		if ((drv_stat != 0x80) && (drv_stat != 0x7f))
+			break;
+		__msleep(500, can_sleep);
+		if (retry-- <= 0)
+			break;
+	}
+
+	tf.lbah = readb((void __iomem *) ap->ioaddr.lbah_addr);
+	tf.lbam = readb((void __iomem *) ap->ioaddr.lbam_addr);
+	tf.lbal = readb((void __iomem *) ap->ioaddr.lbal_addr);
+	tf.nsect = readb((void __iomem *) ap->ioaddr.nsect_addr);
+
+	dev->class = ata_dev_classify(&tf);
+	if (!ata_dev_enabled(dev)) {
+		VPRINTK("Port disabled post-sig: No device present.\n");
+		ata_port_disable(ap);
+	}
+
+	writelfl(0, port_mmio + EDMA_ERR_IRQ_CAUSE_OFS);
+
+	pp->pp_flags &= ~MV_PP_FLAG_EDMA_EN;
+
+	VPRINTK("EXIT\n");
+}
+
+static void mv_phy_reset(struct ata_port *ap)
+{
+	__mv_phy_reset(ap, 1);
+}
+
+/**
+ *      mv_eng_timeout - Routine called by libata when SCSI times out I/O
+ *      @ap: ATA channel to manipulate
+ *
+ *      Intent is to clear all pending error conditions, reset the
+ *      chip/bus, fail the command, and move on.
+ *
+ *      LOCKING:
+ *      This routine holds the host_set lock while failing the command.
+ */
+static void mv_eng_timeout(struct ata_port *ap)
+{
+	struct ata_queued_cmd *qc;
+	unsigned long flags;
+
+	ata_port_printk(ap, KERN_ERR, "Entering mv_eng_timeout\n");
+	DPRINTK("All regs @ start of eng_timeout\n");
+	mv_dump_all_regs(ap->host_set->mmio_base, ap->port_no,
+			 to_pci_dev(ap->host_set->dev));
+
+	qc = ata_qc_from_tag(ap, ap->active_tag);
+        printk(KERN_ERR "mmio_base %p ap %p qc %p scsi_cmnd %p &cmnd %p\n",
+	       ap->host_set->mmio_base, ap, qc, qc->scsicmd,
+	       &qc->scsicmd->cmnd);
+
+	spin_lock_irqsave(&ap->host_set->lock, flags);
+	mv_err_intr(ap, 0);
+	mv_stop_and_reset(ap);
+	spin_unlock_irqrestore(&ap->host_set->lock, flags);
+
+	WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
+	if (qc->flags & ATA_QCFLAG_ACTIVE) {
+		qc->err_mask |= AC_ERR_TIMEOUT;
+		ata_eh_qc_complete(qc);
+	}
+}
+
+/**
+ *      mv_port_init - Perform some early initialization on a single port.
+ *      @port: libata data structure storing shadow register addresses
+ *      @port_mmio: base address of the port
+ *
+ *      Initialize shadow register mmio addresses, clear outstanding
+ *      interrupts on the port, and unmask interrupts for the future
+ *      start of the port.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static void mv_port_init(struct ata_ioports *port,  void __iomem *port_mmio)
+{
+	unsigned long shd_base = (unsigned long) port_mmio + SHD_BLK_OFS;
+	unsigned serr_ofs;
+
+	/* PIO related setup
+	 */
+	port->data_addr = shd_base + (sizeof(u32) * ATA_REG_DATA);
+	port->error_addr =
+		port->feature_addr = shd_base + (sizeof(u32) * ATA_REG_ERR);
+	port->nsect_addr = shd_base + (sizeof(u32) * ATA_REG_NSECT);
+	port->lbal_addr = shd_base + (sizeof(u32) * ATA_REG_LBAL);
+	port->lbam_addr = shd_base + (sizeof(u32) * ATA_REG_LBAM);
+	port->lbah_addr = shd_base + (sizeof(u32) * ATA_REG_LBAH);
+	port->device_addr = shd_base + (sizeof(u32) * ATA_REG_DEVICE);
+	port->status_addr =
+		port->command_addr = shd_base + (sizeof(u32) * ATA_REG_STATUS);
+	/* special case: control/altstatus doesn't have ATA_REG_ address */
+	port->altstatus_addr = port->ctl_addr = shd_base + SHD_CTL_AST_OFS;
+
+	/* unused: */
+	port->cmd_addr = port->bmdma_addr = port->scr_addr = 0;
+
+	/* Clear any currently outstanding port interrupt conditions */
+	serr_ofs = mv_scr_offset(SCR_ERROR);
+	writelfl(readl(port_mmio + serr_ofs), port_mmio + serr_ofs);
+	writelfl(0, port_mmio + EDMA_ERR_IRQ_CAUSE_OFS);
+
+	/* unmask all EDMA error interrupts */
+	writelfl(~0, port_mmio + EDMA_ERR_IRQ_MASK_OFS);
+
+	VPRINTK("EDMA cfg=0x%08x EDMA IRQ err cause/mask=0x%08x/0x%08x\n",
+		readl(port_mmio + EDMA_CFG_OFS),
+		readl(port_mmio + EDMA_ERR_IRQ_CAUSE_OFS),
+		readl(port_mmio + EDMA_ERR_IRQ_MASK_OFS));
+}
+
+static int mv_chip_id(struct pci_dev *pdev, struct mv_host_priv *hpriv,
+		      unsigned int board_idx)
+{
+	u8 rev_id;
+	u32 hp_flags = hpriv->hp_flags;
+
+	pci_read_config_byte(pdev, PCI_REVISION_ID, &rev_id);
+
+	switch(board_idx) {
+	case chip_5080:
+		hpriv->ops = &mv5xxx_ops;
+		hp_flags |= MV_HP_50XX;
+
+		switch (rev_id) {
+		case 0x1:
+			hp_flags |= MV_HP_ERRATA_50XXB0;
+			break;
+		case 0x3:
+			hp_flags |= MV_HP_ERRATA_50XXB2;
+			break;
+		default:
+			dev_printk(KERN_WARNING, &pdev->dev,
+			   "Applying 50XXB2 workarounds to unknown rev\n");
+			hp_flags |= MV_HP_ERRATA_50XXB2;
+			break;
+		}
+		break;
+
+	case chip_504x:
+	case chip_508x:
+		hpriv->ops = &mv5xxx_ops;
+		hp_flags |= MV_HP_50XX;
+
+		switch (rev_id) {
+		case 0x0:
+			hp_flags |= MV_HP_ERRATA_50XXB0;
+			break;
+		case 0x3:
+			hp_flags |= MV_HP_ERRATA_50XXB2;
+			break;
+		default:
+			dev_printk(KERN_WARNING, &pdev->dev,
+			   "Applying B2 workarounds to unknown rev\n");
+			hp_flags |= MV_HP_ERRATA_50XXB2;
+			break;
+		}
+		break;
+
+	case chip_604x:
+	case chip_608x:
+		hpriv->ops = &mv6xxx_ops;
+
+		switch (rev_id) {
+		case 0x7:
+			hp_flags |= MV_HP_ERRATA_60X1B2;
+			break;
+		case 0x9:
+			hp_flags |= MV_HP_ERRATA_60X1C0;
+			break;
+		default:
+			dev_printk(KERN_WARNING, &pdev->dev,
+				   "Applying B2 workarounds to unknown rev\n");
+			hp_flags |= MV_HP_ERRATA_60X1B2;
+			break;
+		}
+		break;
+
+	case chip_7042:
+	case chip_6042:
+		hpriv->ops = &mv6xxx_ops;
+
+		hp_flags |= MV_HP_GEN_IIE;
+
+		switch (rev_id) {
+		case 0x0:
+			hp_flags |= MV_HP_ERRATA_XX42A0;
+			break;
+		case 0x1:
+			hp_flags |= MV_HP_ERRATA_60X1C0;
+			break;
+		default:
+			dev_printk(KERN_WARNING, &pdev->dev,
+			   "Applying 60X1C0 workarounds to unknown rev\n");
+			hp_flags |= MV_HP_ERRATA_60X1C0;
+			break;
+		}
+		break;
+
+	default:
+		printk(KERN_ERR DRV_NAME ": BUG: invalid board index %u\n", board_idx);
+		return 1;
+	}
+
+	hpriv->hp_flags = hp_flags;
+
+	return 0;
+}
+
+/**
+ *      mv_init_host - Perform some early initialization of the host.
+ *	@pdev: host PCI device
+ *      @probe_ent: early data struct representing the host
+ *
+ *      If possible, do an early global reset of the host.  Then do
+ *      our port init and clear/unmask all/relevant host interrupts.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static int mv_init_host(struct pci_dev *pdev, struct ata_probe_ent *probe_ent,
+			unsigned int board_idx)
+{
+	int rc = 0, n_hc, port, hc;
+	void __iomem *mmio = probe_ent->mmio_base;
+	struct mv_host_priv *hpriv = probe_ent->private_data;
+
+	/* global interrupt mask */
+	writel(0, mmio + HC_MAIN_IRQ_MASK_OFS);
+
+	rc = mv_chip_id(pdev, hpriv, board_idx);
+	if (rc)
+		goto done;
+
+	n_hc = mv_get_hc_count(probe_ent->host_flags);
+	probe_ent->n_ports = MV_PORTS_PER_HC * n_hc;
+
+	for (port = 0; port < probe_ent->n_ports; port++)
+		hpriv->ops->read_preamp(hpriv, port, mmio);
+
+	rc = hpriv->ops->reset_hc(hpriv, mmio, n_hc);
+	if (rc)
+		goto done;
+
+	hpriv->ops->reset_flash(hpriv, mmio);
+	hpriv->ops->reset_bus(pdev, mmio);
+	hpriv->ops->enable_leds(hpriv, mmio);
+
+	for (port = 0; port < probe_ent->n_ports; port++) {
+		if (IS_60XX(hpriv)) {
+			void __iomem *port_mmio = mv_port_base(mmio, port);
+
+			u32 ifctl = readl(port_mmio + SATA_INTERFACE_CTL);
+			ifctl |= (1 << 7);		/* enable gen2i speed */
+			ifctl = (ifctl & 0xfff) | 0x9b1000; /* from chip spec */
+			writelfl(ifctl, port_mmio + SATA_INTERFACE_CTL);
+		}
+
+		hpriv->ops->phy_errata(hpriv, mmio, port);
+	}
+
+	for (port = 0; port < probe_ent->n_ports; port++) {
+		void __iomem *port_mmio = mv_port_base(mmio, port);
+		mv_port_init(&probe_ent->port[port], port_mmio);
+	}
+
+	for (hc = 0; hc < n_hc; hc++) {
+		void __iomem *hc_mmio = mv_hc_base(mmio, hc);
+
+		VPRINTK("HC%i: HC config=0x%08x HC IRQ cause "
+			"(before clear)=0x%08x\n", hc,
+			readl(hc_mmio + HC_CFG_OFS),
+			readl(hc_mmio + HC_IRQ_CAUSE_OFS));
+
+		/* Clear any currently outstanding hc interrupt conditions */
+		writelfl(0, hc_mmio + HC_IRQ_CAUSE_OFS);
+	}
+
+	/* Clear any currently outstanding host interrupt conditions */
+	writelfl(0, mmio + PCI_IRQ_CAUSE_OFS);
+
+	/* and unmask interrupt generation for host regs */
+	writelfl(PCI_UNMASK_ALL_IRQS, mmio + PCI_IRQ_MASK_OFS);
+	writelfl(~HC_MAIN_MASKED_IRQS, mmio + HC_MAIN_IRQ_MASK_OFS);
+
+	VPRINTK("HC MAIN IRQ cause/mask=0x%08x/0x%08x "
+		"PCI int cause/mask=0x%08x/0x%08x\n",
+		readl(mmio + HC_MAIN_IRQ_CAUSE_OFS),
+		readl(mmio + HC_MAIN_IRQ_MASK_OFS),
+		readl(mmio + PCI_IRQ_CAUSE_OFS),
+		readl(mmio + PCI_IRQ_MASK_OFS));
+
+done:
+	return rc;
+}
+
+/**
+ *      mv_print_info - Dump key info to kernel log for perusal.
+ *      @probe_ent: early data struct representing the host
+ *
+ *      FIXME: complete this.
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static void mv_print_info(struct ata_probe_ent *probe_ent)
+{
+	struct pci_dev *pdev = to_pci_dev(probe_ent->dev);
+	struct mv_host_priv *hpriv = probe_ent->private_data;
+	u8 rev_id, scc;
+	const char *scc_s;
+
+	/* Use this to determine the HW stepping of the chip so we know
+	 * what errata to workaround
+	 */
+	pci_read_config_byte(pdev, PCI_REVISION_ID, &rev_id);
+
+	pci_read_config_byte(pdev, PCI_CLASS_DEVICE, &scc);
+	if (scc == 0)
+		scc_s = "SCSI";
+	else if (scc == 0x01)
+		scc_s = "RAID";
+	else
+		scc_s = "unknown";
+
+	dev_printk(KERN_INFO, &pdev->dev,
+	       "%u slots %u ports %s mode IRQ via %s\n",
+	       (unsigned)MV_MAX_Q_DEPTH, probe_ent->n_ports,
+	       scc_s, (MV_HP_FLAG_MSI & hpriv->hp_flags) ? "MSI" : "INTx");
+}
+
+/**
+ *      mv_init_one - handle a positive probe of a Marvell host
+ *      @pdev: PCI device found
+ *      @ent: PCI device ID entry for the matched host
+ *
+ *      LOCKING:
+ *      Inherited from caller.
+ */
+static int mv_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	static int printed_version = 0;
+	struct ata_probe_ent *probe_ent = NULL;
+	struct mv_host_priv *hpriv;
+	unsigned int board_idx = (unsigned int)ent->driver_data;
+	void __iomem *mmio_base;
+	int pci_dev_busy = 0, rc;
+
+	if (!printed_version++)
+		dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
+
+	rc = pci_enable_device(pdev);
+	if (rc) {
+		return rc;
+	}
+	pci_set_master(pdev);
+
+	rc = pci_request_regions(pdev, DRV_NAME);
+	if (rc) {
+		pci_dev_busy = 1;
+		goto err_out;
+	}
+
+	probe_ent = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
+	if (probe_ent == NULL) {
+		rc = -ENOMEM;
+		goto err_out_regions;
+	}
+
+	memset(probe_ent, 0, sizeof(*probe_ent));
+	probe_ent->dev = pci_dev_to_dev(pdev);
+	INIT_LIST_HEAD(&probe_ent->node);
+
+	mmio_base = pci_iomap(pdev, MV_PRIMARY_BAR, 0);
+	if (mmio_base == NULL) {
+		rc = -ENOMEM;
+		goto err_out_free_ent;
+	}
+
+	hpriv = kmalloc(sizeof(*hpriv), GFP_KERNEL);
+	if (!hpriv) {
+		rc = -ENOMEM;
+		goto err_out_iounmap;
+	}
+	memset(hpriv, 0, sizeof(*hpriv));
+
+	probe_ent->sht = mv_port_info[board_idx].sht;
+	probe_ent->host_flags = mv_port_info[board_idx].host_flags;
+	probe_ent->pio_mask = mv_port_info[board_idx].pio_mask;
+	probe_ent->udma_mask = mv_port_info[board_idx].udma_mask;
+	probe_ent->port_ops = mv_port_info[board_idx].port_ops;
+
+	probe_ent->irq = pdev->irq;
+	probe_ent->irq_flags = IRQF_SHARED;
+	probe_ent->mmio_base = mmio_base;
+	probe_ent->private_data = hpriv;
+
+	/* initialize adapter */
+	rc = mv_init_host(pdev, probe_ent, board_idx);
+	if (rc) {
+		goto err_out_hpriv;
+	}
+
+	/* Enable interrupts */
+	if (msi && pci_enable_msi(pdev) == 0) {
+		hpriv->hp_flags |= MV_HP_FLAG_MSI;
+	} else {
+		pci_intx(pdev, 1);
+	}
+
+	mv_dump_pci_cfg(pdev, 0x68);
+	mv_print_info(probe_ent);
+
+	if (ata_device_add(probe_ent) == 0) {
+		rc = -ENODEV;		/* No devices discovered */
+		goto err_out_dev_add;
+	}
+
+	kfree(probe_ent);
+	return 0;
+
+err_out_dev_add:
+	if (MV_HP_FLAG_MSI & hpriv->hp_flags) {
+		pci_disable_msi(pdev);
+	} else {
+		pci_intx(pdev, 0);
+	}
+err_out_hpriv:
+	kfree(hpriv);
+err_out_iounmap:
+	pci_iounmap(pdev, mmio_base);
+err_out_free_ent:
+	kfree(probe_ent);
+err_out_regions:
+	pci_release_regions(pdev);
+err_out:
+	if (!pci_dev_busy) {
+		pci_disable_device(pdev);
+	}
+
+	return rc;
+}
+
+static int __init mv_init(void)
+{
+	return pci_register_driver(&mv_pci_driver);
+}
+
+static void __exit mv_exit(void)
+{
+	pci_unregister_driver(&mv_pci_driver);
+}
+
+MODULE_AUTHOR("Brett Russ");
+MODULE_DESCRIPTION("SCSI low-level driver for Marvell SATA controllers");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, mv_pci_tbl);
+MODULE_VERSION(DRV_VERSION);
+
+module_param(msi, int, 0444);
+MODULE_PARM_DESC(msi, "Enable use of PCI MSI (0=off, 1=on)");
+
+module_init(mv_init);
+module_exit(mv_exit);
diff --git a/drivers/ata/sata_nv.c b/drivers/ata/sata_nv.c
new file mode 100644
index 0000000..be46df7
--- /dev/null
+++ b/drivers/ata/sata_nv.c
@@ -0,0 +1,595 @@
+/*
+ *  sata_nv.c - NVIDIA nForce SATA
+ *
+ *  Copyright 2004 NVIDIA Corp.  All rights reserved.
+ *  Copyright 2004 Andrew Chew
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ *  libata documentation is available via 'make {ps|pdf}docs',
+ *  as Documentation/DocBook/libata.*
+ *
+ *  No hardware documentation available outside of NVIDIA.
+ *  This driver programs the NVIDIA SATA controller in a similar
+ *  fashion as with other PCI IDE BMDMA controllers, with a few
+ *  NV-specific details such as register offsets, SATA phy location,
+ *  hotplug info, etc.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+
+#define DRV_NAME			"sata_nv"
+#define DRV_VERSION			"2.0"
+
+enum {
+	NV_PORTS			= 2,
+	NV_PIO_MASK			= 0x1f,
+	NV_MWDMA_MASK			= 0x07,
+	NV_UDMA_MASK			= 0x7f,
+	NV_PORT0_SCR_REG_OFFSET		= 0x00,
+	NV_PORT1_SCR_REG_OFFSET		= 0x40,
+
+	/* INT_STATUS/ENABLE */
+	NV_INT_STATUS			= 0x10,
+	NV_INT_ENABLE			= 0x11,
+	NV_INT_STATUS_CK804		= 0x440,
+	NV_INT_ENABLE_CK804		= 0x441,
+
+	/* INT_STATUS/ENABLE bits */
+	NV_INT_DEV			= 0x01,
+	NV_INT_PM			= 0x02,
+	NV_INT_ADDED			= 0x04,
+	NV_INT_REMOVED			= 0x08,
+
+	NV_INT_PORT_SHIFT		= 4,	/* each port occupies 4 bits */
+
+	NV_INT_ALL			= 0x0f,
+	NV_INT_MASK			= NV_INT_DEV |
+					  NV_INT_ADDED | NV_INT_REMOVED,
+
+	/* INT_CONFIG */
+	NV_INT_CONFIG			= 0x12,
+	NV_INT_CONFIG_METHD		= 0x01, // 0 = INT, 1 = SMI
+
+	// For PCI config register 20
+	NV_MCP_SATA_CFG_20		= 0x50,
+	NV_MCP_SATA_CFG_20_SATA_SPACE_EN = 0x04,
+};
+
+static int nv_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
+static void nv_ck804_host_stop(struct ata_host_set *host_set);
+static irqreturn_t nv_generic_interrupt(int irq, void *dev_instance,
+					struct pt_regs *regs);
+static irqreturn_t nv_nf2_interrupt(int irq, void *dev_instance,
+				    struct pt_regs *regs);
+static irqreturn_t nv_ck804_interrupt(int irq, void *dev_instance,
+				      struct pt_regs *regs);
+static u32 nv_scr_read (struct ata_port *ap, unsigned int sc_reg);
+static void nv_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val);
+
+static void nv_nf2_freeze(struct ata_port *ap);
+static void nv_nf2_thaw(struct ata_port *ap);
+static void nv_ck804_freeze(struct ata_port *ap);
+static void nv_ck804_thaw(struct ata_port *ap);
+static void nv_error_handler(struct ata_port *ap);
+
+enum nv_host_type
+{
+	GENERIC,
+	NFORCE2,
+	NFORCE3 = NFORCE2,	/* NF2 == NF3 as far as sata_nv is concerned */
+	CK804
+};
+
+static const struct pci_device_id nv_pci_tbl[] = {
+	{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE2S_SATA,
+		PCI_ANY_ID, PCI_ANY_ID, 0, 0, NFORCE2 },
+	{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SATA,
+		PCI_ANY_ID, PCI_ANY_ID, 0, 0, NFORCE3 },
+	{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE3S_SATA2,
+		PCI_ANY_ID, PCI_ANY_ID, 0, 0, NFORCE3 },
+	{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_CK804_SATA,
+		PCI_ANY_ID, PCI_ANY_ID, 0, 0, CK804 },
+	{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_CK804_SATA2,
+		PCI_ANY_ID, PCI_ANY_ID, 0, 0, CK804 },
+	{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP04_SATA,
+		PCI_ANY_ID, PCI_ANY_ID, 0, 0, CK804 },
+	{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP04_SATA2,
+		PCI_ANY_ID, PCI_ANY_ID, 0, 0, CK804 },
+	{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SATA,
+		PCI_ANY_ID, PCI_ANY_ID, 0, 0, GENERIC },
+	{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP51_SATA2,
+		PCI_ANY_ID, PCI_ANY_ID, 0, 0, GENERIC },
+	{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SATA,
+		PCI_ANY_ID, PCI_ANY_ID, 0, 0, GENERIC },
+	{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP55_SATA2,
+		PCI_ANY_ID, PCI_ANY_ID, 0, 0, GENERIC },
+	{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SATA,
+		PCI_ANY_ID, PCI_ANY_ID, 0, 0, GENERIC },
+	{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SATA2,
+		PCI_ANY_ID, PCI_ANY_ID, 0, 0, GENERIC },
+	{ PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SATA3,
+		PCI_ANY_ID, PCI_ANY_ID, 0, 0, GENERIC },
+	{ PCI_VENDOR_ID_NVIDIA, 0x045c, PCI_ANY_ID, PCI_ANY_ID, 0, 0, GENERIC },
+	{ PCI_VENDOR_ID_NVIDIA, 0x045d, PCI_ANY_ID, PCI_ANY_ID, 0, 0, GENERIC },
+	{ PCI_VENDOR_ID_NVIDIA, 0x045e, PCI_ANY_ID, PCI_ANY_ID, 0, 0, GENERIC },
+	{ PCI_VENDOR_ID_NVIDIA, 0x045f, PCI_ANY_ID, PCI_ANY_ID, 0, 0, GENERIC },
+	{ PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID,
+		PCI_ANY_ID, PCI_ANY_ID,
+		PCI_CLASS_STORAGE_IDE<<8, 0xffff00, GENERIC },
+	{ PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID,
+		PCI_ANY_ID, PCI_ANY_ID,
+		PCI_CLASS_STORAGE_RAID<<8, 0xffff00, GENERIC },
+	{ 0, } /* terminate list */
+};
+
+static struct pci_driver nv_pci_driver = {
+	.name			= DRV_NAME,
+	.id_table		= nv_pci_tbl,
+	.probe			= nv_init_one,
+	.remove			= ata_pci_remove_one,
+};
+
+static struct scsi_host_template nv_sht = {
+	.module			= THIS_MODULE,
+	.name			= DRV_NAME,
+	.ioctl			= ata_scsi_ioctl,
+	.queuecommand		= ata_scsi_queuecmd,
+	.can_queue		= ATA_DEF_QUEUE,
+	.this_id		= ATA_SHT_THIS_ID,
+	.sg_tablesize		= LIBATA_MAX_PRD,
+	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
+	.emulated		= ATA_SHT_EMULATED,
+	.use_clustering		= ATA_SHT_USE_CLUSTERING,
+	.proc_name		= DRV_NAME,
+	.dma_boundary		= ATA_DMA_BOUNDARY,
+	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
+	.bios_param		= ata_std_bios_param,
+};
+
+static const struct ata_port_operations nv_generic_ops = {
+	.port_disable		= ata_port_disable,
+	.tf_load		= ata_tf_load,
+	.tf_read		= ata_tf_read,
+	.exec_command		= ata_exec_command,
+	.check_status		= ata_check_status,
+	.dev_select		= ata_std_dev_select,
+	.bmdma_setup		= ata_bmdma_setup,
+	.bmdma_start		= ata_bmdma_start,
+	.bmdma_stop		= ata_bmdma_stop,
+	.bmdma_status		= ata_bmdma_status,
+	.qc_prep		= ata_qc_prep,
+	.qc_issue		= ata_qc_issue_prot,
+	.freeze			= ata_bmdma_freeze,
+	.thaw			= ata_bmdma_thaw,
+	.error_handler		= nv_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
+	.data_xfer		= ata_pio_data_xfer,
+	.irq_handler		= nv_generic_interrupt,
+	.irq_clear		= ata_bmdma_irq_clear,
+	.scr_read		= nv_scr_read,
+	.scr_write		= nv_scr_write,
+	.port_start		= ata_port_start,
+	.port_stop		= ata_port_stop,
+	.host_stop		= ata_pci_host_stop,
+};
+
+static const struct ata_port_operations nv_nf2_ops = {
+	.port_disable		= ata_port_disable,
+	.tf_load		= ata_tf_load,
+	.tf_read		= ata_tf_read,
+	.exec_command		= ata_exec_command,
+	.check_status		= ata_check_status,
+	.dev_select		= ata_std_dev_select,
+	.bmdma_setup		= ata_bmdma_setup,
+	.bmdma_start		= ata_bmdma_start,
+	.bmdma_stop		= ata_bmdma_stop,
+	.bmdma_status		= ata_bmdma_status,
+	.qc_prep		= ata_qc_prep,
+	.qc_issue		= ata_qc_issue_prot,
+	.freeze			= nv_nf2_freeze,
+	.thaw			= nv_nf2_thaw,
+	.error_handler		= nv_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
+	.data_xfer		= ata_pio_data_xfer,
+	.irq_handler		= nv_nf2_interrupt,
+	.irq_clear		= ata_bmdma_irq_clear,
+	.scr_read		= nv_scr_read,
+	.scr_write		= nv_scr_write,
+	.port_start		= ata_port_start,
+	.port_stop		= ata_port_stop,
+	.host_stop		= ata_pci_host_stop,
+};
+
+static const struct ata_port_operations nv_ck804_ops = {
+	.port_disable		= ata_port_disable,
+	.tf_load		= ata_tf_load,
+	.tf_read		= ata_tf_read,
+	.exec_command		= ata_exec_command,
+	.check_status		= ata_check_status,
+	.dev_select		= ata_std_dev_select,
+	.bmdma_setup		= ata_bmdma_setup,
+	.bmdma_start		= ata_bmdma_start,
+	.bmdma_stop		= ata_bmdma_stop,
+	.bmdma_status		= ata_bmdma_status,
+	.qc_prep		= ata_qc_prep,
+	.qc_issue		= ata_qc_issue_prot,
+	.freeze			= nv_ck804_freeze,
+	.thaw			= nv_ck804_thaw,
+	.error_handler		= nv_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
+	.data_xfer		= ata_pio_data_xfer,
+	.irq_handler		= nv_ck804_interrupt,
+	.irq_clear		= ata_bmdma_irq_clear,
+	.scr_read		= nv_scr_read,
+	.scr_write		= nv_scr_write,
+	.port_start		= ata_port_start,
+	.port_stop		= ata_port_stop,
+	.host_stop		= nv_ck804_host_stop,
+};
+
+static struct ata_port_info nv_port_info[] = {
+	/* generic */
+	{
+		.sht		= &nv_sht,
+		.host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY,
+		.pio_mask	= NV_PIO_MASK,
+		.mwdma_mask	= NV_MWDMA_MASK,
+		.udma_mask	= NV_UDMA_MASK,
+		.port_ops	= &nv_generic_ops,
+	},
+	/* nforce2/3 */
+	{
+		.sht		= &nv_sht,
+		.host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY,
+		.pio_mask	= NV_PIO_MASK,
+		.mwdma_mask	= NV_MWDMA_MASK,
+		.udma_mask	= NV_UDMA_MASK,
+		.port_ops	= &nv_nf2_ops,
+	},
+	/* ck804 */
+	{
+		.sht		= &nv_sht,
+		.host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY,
+		.pio_mask	= NV_PIO_MASK,
+		.mwdma_mask	= NV_MWDMA_MASK,
+		.udma_mask	= NV_UDMA_MASK,
+		.port_ops	= &nv_ck804_ops,
+	},
+};
+
+MODULE_AUTHOR("NVIDIA");
+MODULE_DESCRIPTION("low-level driver for NVIDIA nForce SATA controller");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, nv_pci_tbl);
+MODULE_VERSION(DRV_VERSION);
+
+static irqreturn_t nv_generic_interrupt(int irq, void *dev_instance,
+					struct pt_regs *regs)
+{
+	struct ata_host_set *host_set = dev_instance;
+	unsigned int i;
+	unsigned int handled = 0;
+	unsigned long flags;
+
+	spin_lock_irqsave(&host_set->lock, flags);
+
+	for (i = 0; i < host_set->n_ports; i++) {
+		struct ata_port *ap;
+
+		ap = host_set->ports[i];
+		if (ap &&
+		    !(ap->flags & ATA_FLAG_DISABLED)) {
+			struct ata_queued_cmd *qc;
+
+			qc = ata_qc_from_tag(ap, ap->active_tag);
+			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)))
+				handled += ata_host_intr(ap, qc);
+			else
+				// No request pending?  Clear interrupt status
+				// anyway, in case there's one pending.
+				ap->ops->check_status(ap);
+		}
+
+	}
+
+	spin_unlock_irqrestore(&host_set->lock, flags);
+
+	return IRQ_RETVAL(handled);
+}
+
+static int nv_host_intr(struct ata_port *ap, u8 irq_stat)
+{
+	struct ata_queued_cmd *qc = ata_qc_from_tag(ap, ap->active_tag);
+	int handled;
+
+	/* freeze if hotplugged */
+	if (unlikely(irq_stat & (NV_INT_ADDED | NV_INT_REMOVED))) {
+		ata_port_freeze(ap);
+		return 1;
+	}
+
+	/* bail out if not our interrupt */
+	if (!(irq_stat & NV_INT_DEV))
+		return 0;
+
+	/* DEV interrupt w/ no active qc? */
+	if (unlikely(!qc || (qc->tf.flags & ATA_TFLAG_POLLING))) {
+		ata_check_status(ap);
+		return 1;
+	}
+
+	/* handle interrupt */
+	handled = ata_host_intr(ap, qc);
+	if (unlikely(!handled)) {
+		/* spurious, clear it */
+		ata_check_status(ap);
+	}
+
+	return 1;
+}
+
+static irqreturn_t nv_do_interrupt(struct ata_host_set *host_set, u8 irq_stat)
+{
+	int i, handled = 0;
+
+	for (i = 0; i < host_set->n_ports; i++) {
+		struct ata_port *ap = host_set->ports[i];
+
+		if (ap && !(ap->flags & ATA_FLAG_DISABLED))
+			handled += nv_host_intr(ap, irq_stat);
+
+		irq_stat >>= NV_INT_PORT_SHIFT;
+	}
+
+	return IRQ_RETVAL(handled);
+}
+
+static irqreturn_t nv_nf2_interrupt(int irq, void *dev_instance,
+				    struct pt_regs *regs)
+{
+	struct ata_host_set *host_set = dev_instance;
+	u8 irq_stat;
+	irqreturn_t ret;
+
+	spin_lock(&host_set->lock);
+	irq_stat = inb(host_set->ports[0]->ioaddr.scr_addr + NV_INT_STATUS);
+	ret = nv_do_interrupt(host_set, irq_stat);
+	spin_unlock(&host_set->lock);
+
+	return ret;
+}
+
+static irqreturn_t nv_ck804_interrupt(int irq, void *dev_instance,
+				      struct pt_regs *regs)
+{
+	struct ata_host_set *host_set = dev_instance;
+	u8 irq_stat;
+	irqreturn_t ret;
+
+	spin_lock(&host_set->lock);
+	irq_stat = readb(host_set->mmio_base + NV_INT_STATUS_CK804);
+	ret = nv_do_interrupt(host_set, irq_stat);
+	spin_unlock(&host_set->lock);
+
+	return ret;
+}
+
+static u32 nv_scr_read (struct ata_port *ap, unsigned int sc_reg)
+{
+	if (sc_reg > SCR_CONTROL)
+		return 0xffffffffU;
+
+	return ioread32((void __iomem *)ap->ioaddr.scr_addr + (sc_reg * 4));
+}
+
+static void nv_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val)
+{
+	if (sc_reg > SCR_CONTROL)
+		return;
+
+	iowrite32(val, (void __iomem *)ap->ioaddr.scr_addr + (sc_reg * 4));
+}
+
+static void nv_nf2_freeze(struct ata_port *ap)
+{
+	unsigned long scr_addr = ap->host_set->ports[0]->ioaddr.scr_addr;
+	int shift = ap->port_no * NV_INT_PORT_SHIFT;
+	u8 mask;
+
+	mask = inb(scr_addr + NV_INT_ENABLE);
+	mask &= ~(NV_INT_ALL << shift);
+	outb(mask, scr_addr + NV_INT_ENABLE);
+}
+
+static void nv_nf2_thaw(struct ata_port *ap)
+{
+	unsigned long scr_addr = ap->host_set->ports[0]->ioaddr.scr_addr;
+	int shift = ap->port_no * NV_INT_PORT_SHIFT;
+	u8 mask;
+
+	outb(NV_INT_ALL << shift, scr_addr + NV_INT_STATUS);
+
+	mask = inb(scr_addr + NV_INT_ENABLE);
+	mask |= (NV_INT_MASK << shift);
+	outb(mask, scr_addr + NV_INT_ENABLE);
+}
+
+static void nv_ck804_freeze(struct ata_port *ap)
+{
+	void __iomem *mmio_base = ap->host_set->mmio_base;
+	int shift = ap->port_no * NV_INT_PORT_SHIFT;
+	u8 mask;
+
+	mask = readb(mmio_base + NV_INT_ENABLE_CK804);
+	mask &= ~(NV_INT_ALL << shift);
+	writeb(mask, mmio_base + NV_INT_ENABLE_CK804);
+}
+
+static void nv_ck804_thaw(struct ata_port *ap)
+{
+	void __iomem *mmio_base = ap->host_set->mmio_base;
+	int shift = ap->port_no * NV_INT_PORT_SHIFT;
+	u8 mask;
+
+	writeb(NV_INT_ALL << shift, mmio_base + NV_INT_STATUS_CK804);
+
+	mask = readb(mmio_base + NV_INT_ENABLE_CK804);
+	mask |= (NV_INT_MASK << shift);
+	writeb(mask, mmio_base + NV_INT_ENABLE_CK804);
+}
+
+static int nv_hardreset(struct ata_port *ap, unsigned int *class)
+{
+	unsigned int dummy;
+
+	/* SATA hardreset fails to retrieve proper device signature on
+	 * some controllers.  Don't classify on hardreset.  For more
+	 * info, see http://bugme.osdl.org/show_bug.cgi?id=3352
+	 */
+	return sata_std_hardreset(ap, &dummy);
+}
+
+static void nv_error_handler(struct ata_port *ap)
+{
+	ata_bmdma_drive_eh(ap, ata_std_prereset, ata_std_softreset,
+			   nv_hardreset, ata_std_postreset);
+}
+
+static int nv_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	static int printed_version = 0;
+	struct ata_port_info *ppi;
+	struct ata_probe_ent *probe_ent;
+	int pci_dev_busy = 0;
+	int rc;
+	u32 bar;
+	unsigned long base;
+
+        // Make sure this is a SATA controller by counting the number of bars
+        // (NVIDIA SATA controllers will always have six bars).  Otherwise,
+        // it's an IDE controller and we ignore it.
+	for (bar=0; bar<6; bar++)
+		if (pci_resource_start(pdev, bar) == 0)
+			return -ENODEV;
+
+	if (!printed_version++)
+		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
+
+	rc = pci_enable_device(pdev);
+	if (rc)
+		goto err_out;
+
+	rc = pci_request_regions(pdev, DRV_NAME);
+	if (rc) {
+		pci_dev_busy = 1;
+		goto err_out_disable;
+	}
+
+	rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
+	if (rc)
+		goto err_out_regions;
+	rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
+	if (rc)
+		goto err_out_regions;
+
+	rc = -ENOMEM;
+
+	ppi = &nv_port_info[ent->driver_data];
+	probe_ent = ata_pci_init_native_mode(pdev, &ppi, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
+	if (!probe_ent)
+		goto err_out_regions;
+
+	probe_ent->mmio_base = pci_iomap(pdev, 5, 0);
+	if (!probe_ent->mmio_base) {
+		rc = -EIO;
+		goto err_out_free_ent;
+	}
+
+	base = (unsigned long)probe_ent->mmio_base;
+
+	probe_ent->port[0].scr_addr = base + NV_PORT0_SCR_REG_OFFSET;
+	probe_ent->port[1].scr_addr = base + NV_PORT1_SCR_REG_OFFSET;
+
+	/* enable SATA space for CK804 */
+	if (ent->driver_data == CK804) {
+		u8 regval;
+
+		pci_read_config_byte(pdev, NV_MCP_SATA_CFG_20, &regval);
+		regval |= NV_MCP_SATA_CFG_20_SATA_SPACE_EN;
+		pci_write_config_byte(pdev, NV_MCP_SATA_CFG_20, regval);
+	}
+
+	pci_set_master(pdev);
+
+	rc = ata_device_add(probe_ent);
+	if (rc != NV_PORTS)
+		goto err_out_iounmap;
+
+	kfree(probe_ent);
+
+	return 0;
+
+err_out_iounmap:
+	pci_iounmap(pdev, probe_ent->mmio_base);
+err_out_free_ent:
+	kfree(probe_ent);
+err_out_regions:
+	pci_release_regions(pdev);
+err_out_disable:
+	if (!pci_dev_busy)
+		pci_disable_device(pdev);
+err_out:
+	return rc;
+}
+
+static void nv_ck804_host_stop(struct ata_host_set *host_set)
+{
+	struct pci_dev *pdev = to_pci_dev(host_set->dev);
+	u8 regval;
+
+	/* disable SATA space for CK804 */
+	pci_read_config_byte(pdev, NV_MCP_SATA_CFG_20, &regval);
+	regval &= ~NV_MCP_SATA_CFG_20_SATA_SPACE_EN;
+	pci_write_config_byte(pdev, NV_MCP_SATA_CFG_20, regval);
+
+	ata_pci_host_stop(host_set);
+}
+
+static int __init nv_init(void)
+{
+	return pci_register_driver(&nv_pci_driver);
+}
+
+static void __exit nv_exit(void)
+{
+	pci_unregister_driver(&nv_pci_driver);
+}
+
+module_init(nv_init);
+module_exit(nv_exit);
diff --git a/drivers/ata/sata_promise.c b/drivers/ata/sata_promise.c
new file mode 100644
index 0000000..a5b3a7d
--- /dev/null
+++ b/drivers/ata/sata_promise.c
@@ -0,0 +1,844 @@
+/*
+ *  sata_promise.c - Promise SATA
+ *
+ *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
+ *  		    Please ALWAYS copy linux-ide@vger.kernel.org
+ *		    on emails.
+ *
+ *  Copyright 2003-2004 Red Hat, Inc.
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ *  libata documentation is available via 'make {ps|pdf}docs',
+ *  as Documentation/DocBook/libata.*
+ *
+ *  Hardware information only available under NDA.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+#include <linux/device.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_cmnd.h>
+#include <linux/libata.h>
+#include <asm/io.h>
+#include "sata_promise.h"
+
+#define DRV_NAME	"sata_promise"
+#define DRV_VERSION	"1.04"
+
+
+enum {
+	PDC_PKT_SUBMIT		= 0x40, /* Command packet pointer addr */
+	PDC_INT_SEQMASK		= 0x40,	/* Mask of asserted SEQ INTs */
+	PDC_TBG_MODE		= 0x41,	/* TBG mode */
+	PDC_FLASH_CTL		= 0x44, /* Flash control register */
+	PDC_PCI_CTL		= 0x48, /* PCI control and status register */
+	PDC_GLOBAL_CTL		= 0x48, /* Global control/status (per port) */
+	PDC_CTLSTAT		= 0x60,	/* IDE control and status (per port) */
+	PDC_SATA_PLUG_CSR	= 0x6C, /* SATA Plug control/status reg */
+	PDC2_SATA_PLUG_CSR	= 0x60, /* SATAII Plug control/status reg */
+	PDC_SLEW_CTL		= 0x470, /* slew rate control reg */
+
+	PDC_ERR_MASK		= (1<<19) | (1<<20) | (1<<21) | (1<<22) |
+				  (1<<8) | (1<<9) | (1<<10),
+
+	board_2037x		= 0,	/* FastTrak S150 TX2plus */
+	board_20319		= 1,	/* FastTrak S150 TX4 */
+	board_20619		= 2,	/* FastTrak TX4000 */
+	board_20771		= 3,	/* FastTrak TX2300 */
+	board_2057x		= 4,	/* SATAII150 Tx2plus */
+	board_40518		= 5,	/* SATAII150 Tx4 */
+
+	PDC_HAS_PATA		= (1 << 1), /* PDC20375/20575 has PATA */
+
+	PDC_RESET		= (1 << 11), /* HDMA reset */
+
+	PDC_COMMON_FLAGS	= ATA_FLAG_NO_LEGACY | ATA_FLAG_SRST |
+				  ATA_FLAG_MMIO | ATA_FLAG_NO_ATAPI |
+				  ATA_FLAG_PIO_POLLING,
+};
+
+
+struct pdc_port_priv {
+	u8			*pkt;
+	dma_addr_t		pkt_dma;
+};
+
+struct pdc_host_priv {
+	int			hotplug_offset;
+};
+
+static u32 pdc_sata_scr_read (struct ata_port *ap, unsigned int sc_reg);
+static void pdc_sata_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val);
+static int pdc_ata_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
+static irqreturn_t pdc_interrupt (int irq, void *dev_instance, struct pt_regs *regs);
+static void pdc_eng_timeout(struct ata_port *ap);
+static int pdc_port_start(struct ata_port *ap);
+static void pdc_port_stop(struct ata_port *ap);
+static void pdc_pata_phy_reset(struct ata_port *ap);
+static void pdc_sata_phy_reset(struct ata_port *ap);
+static void pdc_qc_prep(struct ata_queued_cmd *qc);
+static void pdc_tf_load_mmio(struct ata_port *ap, const struct ata_taskfile *tf);
+static void pdc_exec_command_mmio(struct ata_port *ap, const struct ata_taskfile *tf);
+static void pdc_irq_clear(struct ata_port *ap);
+static unsigned int pdc_qc_issue_prot(struct ata_queued_cmd *qc);
+static void pdc_host_stop(struct ata_host_set *host_set);
+
+
+static struct scsi_host_template pdc_ata_sht = {
+	.module			= THIS_MODULE,
+	.name			= DRV_NAME,
+	.ioctl			= ata_scsi_ioctl,
+	.queuecommand		= ata_scsi_queuecmd,
+	.can_queue		= ATA_DEF_QUEUE,
+	.this_id		= ATA_SHT_THIS_ID,
+	.sg_tablesize		= LIBATA_MAX_PRD,
+	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
+	.emulated		= ATA_SHT_EMULATED,
+	.use_clustering		= ATA_SHT_USE_CLUSTERING,
+	.proc_name		= DRV_NAME,
+	.dma_boundary		= ATA_DMA_BOUNDARY,
+	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
+	.bios_param		= ata_std_bios_param,
+};
+
+static const struct ata_port_operations pdc_sata_ops = {
+	.port_disable		= ata_port_disable,
+	.tf_load		= pdc_tf_load_mmio,
+	.tf_read		= ata_tf_read,
+	.check_status		= ata_check_status,
+	.exec_command		= pdc_exec_command_mmio,
+	.dev_select		= ata_std_dev_select,
+
+	.phy_reset		= pdc_sata_phy_reset,
+
+	.qc_prep		= pdc_qc_prep,
+	.qc_issue		= pdc_qc_issue_prot,
+	.eng_timeout		= pdc_eng_timeout,
+	.data_xfer		= ata_mmio_data_xfer,
+	.irq_handler		= pdc_interrupt,
+	.irq_clear		= pdc_irq_clear,
+
+	.scr_read		= pdc_sata_scr_read,
+	.scr_write		= pdc_sata_scr_write,
+	.port_start		= pdc_port_start,
+	.port_stop		= pdc_port_stop,
+	.host_stop		= pdc_host_stop,
+};
+
+static const struct ata_port_operations pdc_pata_ops = {
+	.port_disable		= ata_port_disable,
+	.tf_load		= pdc_tf_load_mmio,
+	.tf_read		= ata_tf_read,
+	.check_status		= ata_check_status,
+	.exec_command		= pdc_exec_command_mmio,
+	.dev_select		= ata_std_dev_select,
+
+	.phy_reset		= pdc_pata_phy_reset,
+
+	.qc_prep		= pdc_qc_prep,
+	.qc_issue		= pdc_qc_issue_prot,
+	.data_xfer		= ata_mmio_data_xfer,
+	.eng_timeout		= pdc_eng_timeout,
+	.irq_handler		= pdc_interrupt,
+	.irq_clear		= pdc_irq_clear,
+
+	.port_start		= pdc_port_start,
+	.port_stop		= pdc_port_stop,
+	.host_stop		= pdc_host_stop,
+};
+
+static const struct ata_port_info pdc_port_info[] = {
+	/* board_2037x */
+	{
+		.sht		= &pdc_ata_sht,
+		.host_flags	= PDC_COMMON_FLAGS | ATA_FLAG_SATA,
+		.pio_mask	= 0x1f, /* pio0-4 */
+		.mwdma_mask	= 0x07, /* mwdma0-2 */
+		.udma_mask	= 0x7f, /* udma0-6 ; FIXME */
+		.port_ops	= &pdc_sata_ops,
+	},
+
+	/* board_20319 */
+	{
+		.sht		= &pdc_ata_sht,
+		.host_flags	= PDC_COMMON_FLAGS | ATA_FLAG_SATA,
+		.pio_mask	= 0x1f, /* pio0-4 */
+		.mwdma_mask	= 0x07, /* mwdma0-2 */
+		.udma_mask	= 0x7f, /* udma0-6 ; FIXME */
+		.port_ops	= &pdc_sata_ops,
+	},
+
+	/* board_20619 */
+	{
+		.sht		= &pdc_ata_sht,
+		.host_flags	= PDC_COMMON_FLAGS | ATA_FLAG_SLAVE_POSS,
+		.pio_mask	= 0x1f, /* pio0-4 */
+		.mwdma_mask	= 0x07, /* mwdma0-2 */
+		.udma_mask	= 0x7f, /* udma0-6 ; FIXME */
+		.port_ops	= &pdc_pata_ops,
+	},
+
+	/* board_20771 */
+	{
+		.sht		= &pdc_ata_sht,
+		.host_flags	= PDC_COMMON_FLAGS | ATA_FLAG_SATA,
+		.pio_mask	= 0x1f, /* pio0-4 */
+		.mwdma_mask	= 0x07, /* mwdma0-2 */
+		.udma_mask	= 0x7f, /* udma0-6 ; FIXME */
+		.port_ops	= &pdc_sata_ops,
+	},
+
+	/* board_2057x */
+	{
+		.sht		= &pdc_ata_sht,
+		.host_flags	= PDC_COMMON_FLAGS | ATA_FLAG_SATA,
+		.pio_mask	= 0x1f, /* pio0-4 */
+		.mwdma_mask	= 0x07, /* mwdma0-2 */
+		.udma_mask	= 0x7f, /* udma0-6 ; FIXME */
+		.port_ops	= &pdc_sata_ops,
+	},
+
+	/* board_40518 */
+	{
+		.sht		= &pdc_ata_sht,
+		.host_flags	= PDC_COMMON_FLAGS | ATA_FLAG_SATA,
+		.pio_mask	= 0x1f, /* pio0-4 */
+		.mwdma_mask	= 0x07, /* mwdma0-2 */
+		.udma_mask	= 0x7f, /* udma0-6 ; FIXME */
+		.port_ops	= &pdc_sata_ops,
+	},
+};
+
+static const struct pci_device_id pdc_ata_pci_tbl[] = {
+	{ PCI_VENDOR_ID_PROMISE, 0x3371, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_2037x },
+	{ PCI_VENDOR_ID_PROMISE, 0x3570, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_2037x },
+	{ PCI_VENDOR_ID_PROMISE, 0x3571, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_2037x },
+	{ PCI_VENDOR_ID_PROMISE, 0x3373, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_2037x },
+	{ PCI_VENDOR_ID_PROMISE, 0x3375, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_2037x },
+	{ PCI_VENDOR_ID_PROMISE, 0x3376, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_2037x },
+	{ PCI_VENDOR_ID_PROMISE, 0x3574, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_2057x },
+	{ PCI_VENDOR_ID_PROMISE, 0x3d75, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_2057x },
+	{ PCI_VENDOR_ID_PROMISE, 0x3d73, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_2037x },
+
+	{ PCI_VENDOR_ID_PROMISE, 0x3318, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_20319 },
+	{ PCI_VENDOR_ID_PROMISE, 0x3319, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_20319 },
+	{ PCI_VENDOR_ID_PROMISE, 0x3515, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_20319 },
+	{ PCI_VENDOR_ID_PROMISE, 0x3519, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_20319 },
+	{ PCI_VENDOR_ID_PROMISE, 0x3d17, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_20319 },
+	{ PCI_VENDOR_ID_PROMISE, 0x3d18, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_40518 },
+
+	{ PCI_VENDOR_ID_PROMISE, 0x6629, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_20619 },
+
+/* TODO: remove all associated board_20771 code, as it completely
+ * duplicates board_2037x code, unless reason for separation can be
+ * divined.
+ */
+#if 0
+	{ PCI_VENDOR_ID_PROMISE, 0x3570, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_20771 },
+#endif
+
+	{ }	/* terminate list */
+};
+
+
+static struct pci_driver pdc_ata_pci_driver = {
+	.name			= DRV_NAME,
+	.id_table		= pdc_ata_pci_tbl,
+	.probe			= pdc_ata_init_one,
+	.remove			= ata_pci_remove_one,
+};
+
+
+static int pdc_port_start(struct ata_port *ap)
+{
+	struct device *dev = ap->host_set->dev;
+	struct pdc_port_priv *pp;
+	int rc;
+
+	rc = ata_port_start(ap);
+	if (rc)
+		return rc;
+
+	pp = kzalloc(sizeof(*pp), GFP_KERNEL);
+	if (!pp) {
+		rc = -ENOMEM;
+		goto err_out;
+	}
+
+	pp->pkt = dma_alloc_coherent(dev, 128, &pp->pkt_dma, GFP_KERNEL);
+	if (!pp->pkt) {
+		rc = -ENOMEM;
+		goto err_out_kfree;
+	}
+
+	ap->private_data = pp;
+
+	return 0;
+
+err_out_kfree:
+	kfree(pp);
+err_out:
+	ata_port_stop(ap);
+	return rc;
+}
+
+
+static void pdc_port_stop(struct ata_port *ap)
+{
+	struct device *dev = ap->host_set->dev;
+	struct pdc_port_priv *pp = ap->private_data;
+
+	ap->private_data = NULL;
+	dma_free_coherent(dev, 128, pp->pkt, pp->pkt_dma);
+	kfree(pp);
+	ata_port_stop(ap);
+}
+
+
+static void pdc_host_stop(struct ata_host_set *host_set)
+{
+	struct pdc_host_priv *hp = host_set->private_data;
+
+	ata_pci_host_stop(host_set);
+
+	kfree(hp);
+}
+
+
+static void pdc_reset_port(struct ata_port *ap)
+{
+	void __iomem *mmio = (void __iomem *) ap->ioaddr.cmd_addr + PDC_CTLSTAT;
+	unsigned int i;
+	u32 tmp;
+
+	for (i = 11; i > 0; i--) {
+		tmp = readl(mmio);
+		if (tmp & PDC_RESET)
+			break;
+
+		udelay(100);
+
+		tmp |= PDC_RESET;
+		writel(tmp, mmio);
+	}
+
+	tmp &= ~PDC_RESET;
+	writel(tmp, mmio);
+	readl(mmio);	/* flush */
+}
+
+static void pdc_sata_phy_reset(struct ata_port *ap)
+{
+	pdc_reset_port(ap);
+	sata_phy_reset(ap);
+}
+
+static void pdc_pata_cbl_detect(struct ata_port *ap)
+{
+	u8 tmp;
+	void __iomem *mmio = (void *) ap->ioaddr.cmd_addr + PDC_CTLSTAT + 0x03;
+
+	tmp = readb(mmio);
+
+	if (tmp & 0x01) {
+		ap->cbl = ATA_CBL_PATA40;
+		ap->udma_mask &= ATA_UDMA_MASK_40C;
+	} else
+		ap->cbl = ATA_CBL_PATA80;
+}
+
+static void pdc_pata_phy_reset(struct ata_port *ap)
+{
+	pdc_pata_cbl_detect(ap);
+	pdc_reset_port(ap);
+	ata_port_probe(ap);
+	ata_bus_reset(ap);
+}
+
+static u32 pdc_sata_scr_read (struct ata_port *ap, unsigned int sc_reg)
+{
+	if (sc_reg > SCR_CONTROL)
+		return 0xffffffffU;
+	return readl((void __iomem *) ap->ioaddr.scr_addr + (sc_reg * 4));
+}
+
+
+static void pdc_sata_scr_write (struct ata_port *ap, unsigned int sc_reg,
+			       u32 val)
+{
+	if (sc_reg > SCR_CONTROL)
+		return;
+	writel(val, (void __iomem *) ap->ioaddr.scr_addr + (sc_reg * 4));
+}
+
+static void pdc_qc_prep(struct ata_queued_cmd *qc)
+{
+	struct pdc_port_priv *pp = qc->ap->private_data;
+	unsigned int i;
+
+	VPRINTK("ENTER\n");
+
+	switch (qc->tf.protocol) {
+	case ATA_PROT_DMA:
+		ata_qc_prep(qc);
+		/* fall through */
+
+	case ATA_PROT_NODATA:
+		i = pdc_pkt_header(&qc->tf, qc->ap->prd_dma,
+				   qc->dev->devno, pp->pkt);
+
+		if (qc->tf.flags & ATA_TFLAG_LBA48)
+			i = pdc_prep_lba48(&qc->tf, pp->pkt, i);
+		else
+			i = pdc_prep_lba28(&qc->tf, pp->pkt, i);
+
+		pdc_pkt_footer(&qc->tf, pp->pkt, i);
+		break;
+
+	default:
+		break;
+	}
+}
+
+static void pdc_eng_timeout(struct ata_port *ap)
+{
+	struct ata_host_set *host_set = ap->host_set;
+	u8 drv_stat;
+	struct ata_queued_cmd *qc;
+	unsigned long flags;
+
+	DPRINTK("ENTER\n");
+
+	spin_lock_irqsave(&host_set->lock, flags);
+
+	qc = ata_qc_from_tag(ap, ap->active_tag);
+
+	switch (qc->tf.protocol) {
+	case ATA_PROT_DMA:
+	case ATA_PROT_NODATA:
+		ata_port_printk(ap, KERN_ERR, "command timeout\n");
+		drv_stat = ata_wait_idle(ap);
+		qc->err_mask |= __ac_err_mask(drv_stat);
+		break;
+
+	default:
+		drv_stat = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
+
+		ata_port_printk(ap, KERN_ERR,
+				"unknown timeout, cmd 0x%x stat 0x%x\n",
+				qc->tf.command, drv_stat);
+
+		qc->err_mask |= ac_err_mask(drv_stat);
+		break;
+	}
+
+	spin_unlock_irqrestore(&host_set->lock, flags);
+	ata_eh_qc_complete(qc);
+	DPRINTK("EXIT\n");
+}
+
+static inline unsigned int pdc_host_intr( struct ata_port *ap,
+                                          struct ata_queued_cmd *qc)
+{
+	unsigned int handled = 0;
+	u32 tmp;
+	void __iomem *mmio = (void __iomem *) ap->ioaddr.cmd_addr + PDC_GLOBAL_CTL;
+
+	tmp = readl(mmio);
+	if (tmp & PDC_ERR_MASK) {
+		qc->err_mask |= AC_ERR_DEV;
+		pdc_reset_port(ap);
+	}
+
+	switch (qc->tf.protocol) {
+	case ATA_PROT_DMA:
+	case ATA_PROT_NODATA:
+		qc->err_mask |= ac_err_mask(ata_wait_idle(ap));
+		ata_qc_complete(qc);
+		handled = 1;
+		break;
+
+        default:
+		ap->stats.idle_irq++;
+		break;
+        }
+
+	return handled;
+}
+
+static void pdc_irq_clear(struct ata_port *ap)
+{
+	struct ata_host_set *host_set = ap->host_set;
+	void __iomem *mmio = host_set->mmio_base;
+
+	readl(mmio + PDC_INT_SEQMASK);
+}
+
+static irqreturn_t pdc_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
+{
+	struct ata_host_set *host_set = dev_instance;
+	struct ata_port *ap;
+	u32 mask = 0;
+	unsigned int i, tmp;
+	unsigned int handled = 0;
+	void __iomem *mmio_base;
+
+	VPRINTK("ENTER\n");
+
+	if (!host_set || !host_set->mmio_base) {
+		VPRINTK("QUICK EXIT\n");
+		return IRQ_NONE;
+	}
+
+	mmio_base = host_set->mmio_base;
+
+	/* reading should also clear interrupts */
+	mask = readl(mmio_base + PDC_INT_SEQMASK);
+
+	if (mask == 0xffffffff) {
+		VPRINTK("QUICK EXIT 2\n");
+		return IRQ_NONE;
+	}
+
+	spin_lock(&host_set->lock);
+
+	mask &= 0xffff;		/* only 16 tags possible */
+	if (!mask) {
+		VPRINTK("QUICK EXIT 3\n");
+		goto done_irq;
+	}
+
+	writel(mask, mmio_base + PDC_INT_SEQMASK);
+
+	for (i = 0; i < host_set->n_ports; i++) {
+		VPRINTK("port %u\n", i);
+		ap = host_set->ports[i];
+		tmp = mask & (1 << (i + 1));
+		if (tmp && ap &&
+		    !(ap->flags & ATA_FLAG_DISABLED)) {
+			struct ata_queued_cmd *qc;
+
+			qc = ata_qc_from_tag(ap, ap->active_tag);
+			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)))
+				handled += pdc_host_intr(ap, qc);
+		}
+	}
+
+	VPRINTK("EXIT\n");
+
+done_irq:
+	spin_unlock(&host_set->lock);
+	return IRQ_RETVAL(handled);
+}
+
+static inline void pdc_packet_start(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct pdc_port_priv *pp = ap->private_data;
+	unsigned int port_no = ap->port_no;
+	u8 seq = (u8) (port_no + 1);
+
+	VPRINTK("ENTER, ap %p\n", ap);
+
+	writel(0x00000001, ap->host_set->mmio_base + (seq * 4));
+	readl(ap->host_set->mmio_base + (seq * 4));	/* flush */
+
+	pp->pkt[2] = seq;
+	wmb();			/* flush PRD, pkt writes */
+	writel(pp->pkt_dma, (void __iomem *) ap->ioaddr.cmd_addr + PDC_PKT_SUBMIT);
+	readl((void __iomem *) ap->ioaddr.cmd_addr + PDC_PKT_SUBMIT); /* flush */
+}
+
+static unsigned int pdc_qc_issue_prot(struct ata_queued_cmd *qc)
+{
+	switch (qc->tf.protocol) {
+	case ATA_PROT_DMA:
+	case ATA_PROT_NODATA:
+		pdc_packet_start(qc);
+		return 0;
+
+	case ATA_PROT_ATAPI_DMA:
+		BUG();
+		break;
+
+	default:
+		break;
+	}
+
+	return ata_qc_issue_prot(qc);
+}
+
+static void pdc_tf_load_mmio(struct ata_port *ap, const struct ata_taskfile *tf)
+{
+	WARN_ON (tf->protocol == ATA_PROT_DMA ||
+		 tf->protocol == ATA_PROT_NODATA);
+	ata_tf_load(ap, tf);
+}
+
+
+static void pdc_exec_command_mmio(struct ata_port *ap, const struct ata_taskfile *tf)
+{
+	WARN_ON (tf->protocol == ATA_PROT_DMA ||
+		 tf->protocol == ATA_PROT_NODATA);
+	ata_exec_command(ap, tf);
+}
+
+
+static void pdc_ata_setup_port(struct ata_ioports *port, unsigned long base)
+{
+	port->cmd_addr		= base;
+	port->data_addr		= base;
+	port->feature_addr	=
+	port->error_addr	= base + 0x4;
+	port->nsect_addr	= base + 0x8;
+	port->lbal_addr		= base + 0xc;
+	port->lbam_addr		= base + 0x10;
+	port->lbah_addr		= base + 0x14;
+	port->device_addr	= base + 0x18;
+	port->command_addr	=
+	port->status_addr	= base + 0x1c;
+	port->altstatus_addr	=
+	port->ctl_addr		= base + 0x38;
+}
+
+
+static void pdc_host_init(unsigned int chip_id, struct ata_probe_ent *pe)
+{
+	void __iomem *mmio = pe->mmio_base;
+	struct pdc_host_priv *hp = pe->private_data;
+	int hotplug_offset = hp->hotplug_offset;
+	u32 tmp;
+
+	/*
+	 * Except for the hotplug stuff, this is voodoo from the
+	 * Promise driver.  Label this entire section
+	 * "TODO: figure out why we do this"
+	 */
+
+	/* change FIFO_SHD to 8 dwords, enable BMR_BURST */
+	tmp = readl(mmio + PDC_FLASH_CTL);
+	tmp |= 0x12000;	/* bit 16 (fifo 8 dw) and 13 (bmr burst?) */
+	writel(tmp, mmio + PDC_FLASH_CTL);
+
+	/* clear plug/unplug flags for all ports */
+	tmp = readl(mmio + hotplug_offset);
+	writel(tmp | 0xff, mmio + hotplug_offset);
+
+	/* mask plug/unplug ints */
+	tmp = readl(mmio + hotplug_offset);
+	writel(tmp | 0xff0000, mmio + hotplug_offset);
+
+	/* reduce TBG clock to 133 Mhz. */
+	tmp = readl(mmio + PDC_TBG_MODE);
+	tmp &= ~0x30000; /* clear bit 17, 16*/
+	tmp |= 0x10000;  /* set bit 17:16 = 0:1 */
+	writel(tmp, mmio + PDC_TBG_MODE);
+
+	readl(mmio + PDC_TBG_MODE);	/* flush */
+	msleep(10);
+
+	/* adjust slew rate control register. */
+	tmp = readl(mmio + PDC_SLEW_CTL);
+	tmp &= 0xFFFFF03F; /* clear bit 11 ~ 6 */
+	tmp  |= 0x00000900; /* set bit 11-9 = 100b , bit 8-6 = 100 */
+	writel(tmp, mmio + PDC_SLEW_CTL);
+}
+
+static int pdc_ata_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	static int printed_version;
+	struct ata_probe_ent *probe_ent = NULL;
+	struct pdc_host_priv *hp;
+	unsigned long base;
+	void __iomem *mmio_base;
+	unsigned int board_idx = (unsigned int) ent->driver_data;
+	int pci_dev_busy = 0;
+	int rc;
+
+	if (!printed_version++)
+		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
+
+	rc = pci_enable_device(pdev);
+	if (rc)
+		return rc;
+
+	rc = pci_request_regions(pdev, DRV_NAME);
+	if (rc) {
+		pci_dev_busy = 1;
+		goto err_out;
+	}
+
+	rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
+	if (rc)
+		goto err_out_regions;
+	rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
+	if (rc)
+		goto err_out_regions;
+
+	probe_ent = kzalloc(sizeof(*probe_ent), GFP_KERNEL);
+	if (probe_ent == NULL) {
+		rc = -ENOMEM;
+		goto err_out_regions;
+	}
+
+	probe_ent->dev = pci_dev_to_dev(pdev);
+	INIT_LIST_HEAD(&probe_ent->node);
+
+	mmio_base = pci_iomap(pdev, 3, 0);
+	if (mmio_base == NULL) {
+		rc = -ENOMEM;
+		goto err_out_free_ent;
+	}
+	base = (unsigned long) mmio_base;
+
+	hp = kzalloc(sizeof(*hp), GFP_KERNEL);
+	if (hp == NULL) {
+		rc = -ENOMEM;
+		goto err_out_free_ent;
+	}
+
+	/* Set default hotplug offset */
+	hp->hotplug_offset = PDC_SATA_PLUG_CSR;
+	probe_ent->private_data = hp;
+
+	probe_ent->sht		= pdc_port_info[board_idx].sht;
+	probe_ent->host_flags	= pdc_port_info[board_idx].host_flags;
+	probe_ent->pio_mask	= pdc_port_info[board_idx].pio_mask;
+	probe_ent->mwdma_mask	= pdc_port_info[board_idx].mwdma_mask;
+	probe_ent->udma_mask	= pdc_port_info[board_idx].udma_mask;
+	probe_ent->port_ops	= pdc_port_info[board_idx].port_ops;
+
+       	probe_ent->irq = pdev->irq;
+       	probe_ent->irq_flags = IRQF_SHARED;
+	probe_ent->mmio_base = mmio_base;
+
+	pdc_ata_setup_port(&probe_ent->port[0], base + 0x200);
+	pdc_ata_setup_port(&probe_ent->port[1], base + 0x280);
+
+	probe_ent->port[0].scr_addr = base + 0x400;
+	probe_ent->port[1].scr_addr = base + 0x500;
+
+	/* notice 4-port boards */
+	switch (board_idx) {
+	case board_40518:
+		/* Override hotplug offset for SATAII150 */
+		hp->hotplug_offset = PDC2_SATA_PLUG_CSR;
+		/* Fall through */
+	case board_20319:
+       		probe_ent->n_ports = 4;
+
+		pdc_ata_setup_port(&probe_ent->port[2], base + 0x300);
+		pdc_ata_setup_port(&probe_ent->port[3], base + 0x380);
+
+		probe_ent->port[2].scr_addr = base + 0x600;
+		probe_ent->port[3].scr_addr = base + 0x700;
+		break;
+	case board_2057x:
+		/* Override hotplug offset for SATAII150 */
+		hp->hotplug_offset = PDC2_SATA_PLUG_CSR;
+		/* Fall through */
+	case board_2037x:
+		probe_ent->n_ports = 2;
+		break;
+	case board_20771:
+		probe_ent->n_ports = 2;
+		break;
+	case board_20619:
+		probe_ent->n_ports = 4;
+
+		pdc_ata_setup_port(&probe_ent->port[2], base + 0x300);
+		pdc_ata_setup_port(&probe_ent->port[3], base + 0x380);
+
+		probe_ent->port[2].scr_addr = base + 0x600;
+		probe_ent->port[3].scr_addr = base + 0x700;
+		break;
+	default:
+		BUG();
+		break;
+	}
+
+	pci_set_master(pdev);
+
+	/* initialize adapter */
+	pdc_host_init(board_idx, probe_ent);
+
+	/* FIXME: Need any other frees than hp? */
+	if (!ata_device_add(probe_ent))
+		kfree(hp);
+
+	kfree(probe_ent);
+
+	return 0;
+
+err_out_free_ent:
+	kfree(probe_ent);
+err_out_regions:
+	pci_release_regions(pdev);
+err_out:
+	if (!pci_dev_busy)
+		pci_disable_device(pdev);
+	return rc;
+}
+
+
+static int __init pdc_ata_init(void)
+{
+	return pci_register_driver(&pdc_ata_pci_driver);
+}
+
+
+static void __exit pdc_ata_exit(void)
+{
+	pci_unregister_driver(&pdc_ata_pci_driver);
+}
+
+
+MODULE_AUTHOR("Jeff Garzik");
+MODULE_DESCRIPTION("Promise ATA TX2/TX4/TX4000 low-level driver");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, pdc_ata_pci_tbl);
+MODULE_VERSION(DRV_VERSION);
+
+module_init(pdc_ata_init);
+module_exit(pdc_ata_exit);
diff --git a/drivers/ata/sata_promise.h b/drivers/ata/sata_promise.h
new file mode 100644
index 0000000..6ee5e190
--- /dev/null
+++ b/drivers/ata/sata_promise.h
@@ -0,0 +1,157 @@
+/*
+ *  sata_promise.h - Promise SATA common definitions and inline funcs
+ *
+ *  Copyright 2003-2004 Red Hat, Inc.
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ *  libata documentation is available via 'make {ps|pdf}docs',
+ *  as Documentation/DocBook/libata.*
+ *
+ */
+
+#ifndef __SATA_PROMISE_H__
+#define __SATA_PROMISE_H__
+
+#include <linux/ata.h>
+
+enum pdc_packet_bits {
+	PDC_PKT_READ		= (1 << 2),
+	PDC_PKT_NODATA		= (1 << 3),
+
+	PDC_PKT_SIZEMASK	= (1 << 7) | (1 << 6) | (1 << 5),
+	PDC_PKT_CLEAR_BSY	= (1 << 4),
+	PDC_PKT_WAIT_DRDY	= (1 << 3) | (1 << 4),
+	PDC_LAST_REG		= (1 << 3),
+
+	PDC_REG_DEVCTL		= (1 << 3) | (1 << 2) | (1 << 1),
+};
+
+static inline unsigned int pdc_pkt_header(struct ata_taskfile *tf,
+					  dma_addr_t sg_table,
+					  unsigned int devno, u8 *buf)
+{
+	u8 dev_reg;
+	u32 *buf32 = (u32 *) buf;
+
+	/* set control bits (byte 0), zero delay seq id (byte 3),
+	 * and seq id (byte 2)
+	 */
+	switch (tf->protocol) {
+	case ATA_PROT_DMA:
+		if (!(tf->flags & ATA_TFLAG_WRITE))
+			buf32[0] = cpu_to_le32(PDC_PKT_READ);
+		else
+			buf32[0] = 0;
+		break;
+
+	case ATA_PROT_NODATA:
+		buf32[0] = cpu_to_le32(PDC_PKT_NODATA);
+		break;
+
+	default:
+		BUG();
+		break;
+	}
+
+	buf32[1] = cpu_to_le32(sg_table);	/* S/G table addr */
+	buf32[2] = 0;				/* no next-packet */
+
+	if (devno == 0)
+		dev_reg = ATA_DEVICE_OBS;
+	else
+		dev_reg = ATA_DEVICE_OBS | ATA_DEV1;
+
+	/* select device */
+	buf[12] = (1 << 5) | PDC_PKT_CLEAR_BSY | ATA_REG_DEVICE;
+	buf[13] = dev_reg;
+
+	/* device control register */
+	buf[14] = (1 << 5) | PDC_REG_DEVCTL;
+	buf[15] = tf->ctl;
+
+	return 16; 	/* offset of next byte */
+}
+
+static inline unsigned int pdc_pkt_footer(struct ata_taskfile *tf, u8 *buf,
+				  unsigned int i)
+{
+	if (tf->flags & ATA_TFLAG_DEVICE) {
+		buf[i++] = (1 << 5) | ATA_REG_DEVICE;
+		buf[i++] = tf->device;
+	}
+
+	/* and finally the command itself; also includes end-of-pkt marker */
+	buf[i++] = (1 << 5) | PDC_LAST_REG | ATA_REG_CMD;
+	buf[i++] = tf->command;
+
+	return i;
+}
+
+static inline unsigned int pdc_prep_lba28(struct ata_taskfile *tf, u8 *buf, unsigned int i)
+{
+	/* the "(1 << 5)" should be read "(count << 5)" */
+
+	/* ATA command block registers */
+	buf[i++] = (1 << 5) | ATA_REG_FEATURE;
+	buf[i++] = tf->feature;
+
+	buf[i++] = (1 << 5) | ATA_REG_NSECT;
+	buf[i++] = tf->nsect;
+
+	buf[i++] = (1 << 5) | ATA_REG_LBAL;
+	buf[i++] = tf->lbal;
+
+	buf[i++] = (1 << 5) | ATA_REG_LBAM;
+	buf[i++] = tf->lbam;
+
+	buf[i++] = (1 << 5) | ATA_REG_LBAH;
+	buf[i++] = tf->lbah;
+
+	return i;
+}
+
+static inline unsigned int pdc_prep_lba48(struct ata_taskfile *tf, u8 *buf, unsigned int i)
+{
+	/* the "(2 << 5)" should be read "(count << 5)" */
+
+	/* ATA command block registers */
+	buf[i++] = (2 << 5) | ATA_REG_FEATURE;
+	buf[i++] = tf->hob_feature;
+	buf[i++] = tf->feature;
+
+	buf[i++] = (2 << 5) | ATA_REG_NSECT;
+	buf[i++] = tf->hob_nsect;
+	buf[i++] = tf->nsect;
+
+	buf[i++] = (2 << 5) | ATA_REG_LBAL;
+	buf[i++] = tf->hob_lbal;
+	buf[i++] = tf->lbal;
+
+	buf[i++] = (2 << 5) | ATA_REG_LBAM;
+	buf[i++] = tf->hob_lbam;
+	buf[i++] = tf->lbam;
+
+	buf[i++] = (2 << 5) | ATA_REG_LBAH;
+	buf[i++] = tf->hob_lbah;
+	buf[i++] = tf->lbah;
+
+	return i;
+}
+
+
+#endif /* __SATA_PROMISE_H__ */
diff --git a/drivers/ata/sata_qstor.c b/drivers/ata/sata_qstor.c
new file mode 100644
index 0000000..71bd671
--- /dev/null
+++ b/drivers/ata/sata_qstor.c
@@ -0,0 +1,730 @@
+/*
+ *  sata_qstor.c - Pacific Digital Corporation QStor SATA
+ *
+ *  Maintained by:  Mark Lord <mlord@pobox.com>
+ *
+ *  Copyright 2005 Pacific Digital Corporation.
+ *  (OSL/GPL code release authorized by Jalil Fadavi).
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ *  libata documentation is available via 'make {ps|pdf}docs',
+ *  as Documentation/DocBook/libata.*
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+#include <linux/device.h>
+#include <scsi/scsi_host.h>
+#include <asm/io.h>
+#include <linux/libata.h>
+
+#define DRV_NAME	"sata_qstor"
+#define DRV_VERSION	"0.06"
+
+enum {
+	QS_PORTS		= 4,
+	QS_MAX_PRD		= LIBATA_MAX_PRD,
+	QS_CPB_ORDER		= 6,
+	QS_CPB_BYTES		= (1 << QS_CPB_ORDER),
+	QS_PRD_BYTES		= QS_MAX_PRD * 16,
+	QS_PKT_BYTES		= QS_CPB_BYTES + QS_PRD_BYTES,
+
+	/* global register offsets */
+	QS_HCF_CNFG3		= 0x0003, /* host configuration offset */
+	QS_HID_HPHY		= 0x0004, /* host physical interface info */
+	QS_HCT_CTRL		= 0x00e4, /* global interrupt mask offset */
+	QS_HST_SFF		= 0x0100, /* host status fifo offset */
+	QS_HVS_SERD3		= 0x0393, /* PHY enable offset */
+
+	/* global control bits */
+	QS_HPHY_64BIT		= (1 << 1), /* 64-bit bus detected */
+	QS_CNFG3_GSRST		= 0x01,     /* global chip reset */
+	QS_SERD3_PHY_ENA	= 0xf0,     /* PHY detection ENAble*/
+
+	/* per-channel register offsets */
+	QS_CCF_CPBA		= 0x0710, /* chan CPB base address */
+	QS_CCF_CSEP		= 0x0718, /* chan CPB separation factor */
+	QS_CFC_HUFT		= 0x0800, /* host upstream fifo threshold */
+	QS_CFC_HDFT		= 0x0804, /* host downstream fifo threshold */
+	QS_CFC_DUFT		= 0x0808, /* dev upstream fifo threshold */
+	QS_CFC_DDFT		= 0x080c, /* dev downstream fifo threshold */
+	QS_CCT_CTR0		= 0x0900, /* chan control-0 offset */
+	QS_CCT_CTR1		= 0x0901, /* chan control-1 offset */
+	QS_CCT_CFF		= 0x0a00, /* chan command fifo offset */
+
+	/* channel control bits */
+	QS_CTR0_REG		= (1 << 1),   /* register mode (vs. pkt mode) */
+	QS_CTR0_CLER		= (1 << 2),   /* clear channel errors */
+	QS_CTR1_RDEV		= (1 << 1),   /* sata phy/comms reset */
+	QS_CTR1_RCHN		= (1 << 4),   /* reset channel logic */
+	QS_CCF_RUN_PKT		= 0x107,      /* RUN a new dma PKT */
+
+	/* pkt sub-field headers */
+	QS_HCB_HDR		= 0x01,   /* Host Control Block header */
+	QS_DCB_HDR		= 0x02,   /* Device Control Block header */
+
+	/* pkt HCB flag bits */
+	QS_HF_DIRO		= (1 << 0),   /* data DIRection Out */
+	QS_HF_DAT		= (1 << 3),   /* DATa pkt */
+	QS_HF_IEN		= (1 << 4),   /* Interrupt ENable */
+	QS_HF_VLD		= (1 << 5),   /* VaLiD pkt */
+
+	/* pkt DCB flag bits */
+	QS_DF_PORD		= (1 << 2),   /* Pio OR Dma */
+	QS_DF_ELBA		= (1 << 3),   /* Extended LBA (lba48) */
+
+	/* PCI device IDs */
+	board_2068_idx		= 0,	/* QStor 4-port SATA/RAID */
+};
+
+enum {
+	QS_DMA_BOUNDARY		= ~0UL
+};
+
+typedef enum { qs_state_idle, qs_state_pkt, qs_state_mmio } qs_state_t;
+
+struct qs_port_priv {
+	u8			*pkt;
+	dma_addr_t		pkt_dma;
+	qs_state_t		state;
+};
+
+static u32 qs_scr_read (struct ata_port *ap, unsigned int sc_reg);
+static void qs_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val);
+static int qs_ata_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
+static irqreturn_t qs_intr (int irq, void *dev_instance, struct pt_regs *regs);
+static int qs_port_start(struct ata_port *ap);
+static void qs_host_stop(struct ata_host_set *host_set);
+static void qs_port_stop(struct ata_port *ap);
+static void qs_phy_reset(struct ata_port *ap);
+static void qs_qc_prep(struct ata_queued_cmd *qc);
+static unsigned int qs_qc_issue(struct ata_queued_cmd *qc);
+static int qs_check_atapi_dma(struct ata_queued_cmd *qc);
+static void qs_bmdma_stop(struct ata_queued_cmd *qc);
+static u8 qs_bmdma_status(struct ata_port *ap);
+static void qs_irq_clear(struct ata_port *ap);
+static void qs_eng_timeout(struct ata_port *ap);
+
+static struct scsi_host_template qs_ata_sht = {
+	.module			= THIS_MODULE,
+	.name			= DRV_NAME,
+	.ioctl			= ata_scsi_ioctl,
+	.queuecommand		= ata_scsi_queuecmd,
+	.can_queue		= ATA_DEF_QUEUE,
+	.this_id		= ATA_SHT_THIS_ID,
+	.sg_tablesize		= QS_MAX_PRD,
+	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
+	.emulated		= ATA_SHT_EMULATED,
+	//FIXME .use_clustering		= ATA_SHT_USE_CLUSTERING,
+	.use_clustering		= ENABLE_CLUSTERING,
+	.proc_name		= DRV_NAME,
+	.dma_boundary		= QS_DMA_BOUNDARY,
+	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
+	.bios_param		= ata_std_bios_param,
+};
+
+static const struct ata_port_operations qs_ata_ops = {
+	.port_disable		= ata_port_disable,
+	.tf_load		= ata_tf_load,
+	.tf_read		= ata_tf_read,
+	.check_status		= ata_check_status,
+	.check_atapi_dma	= qs_check_atapi_dma,
+	.exec_command		= ata_exec_command,
+	.dev_select		= ata_std_dev_select,
+	.phy_reset		= qs_phy_reset,
+	.qc_prep		= qs_qc_prep,
+	.qc_issue		= qs_qc_issue,
+	.data_xfer		= ata_mmio_data_xfer,
+	.eng_timeout		= qs_eng_timeout,
+	.irq_handler		= qs_intr,
+	.irq_clear		= qs_irq_clear,
+	.scr_read		= qs_scr_read,
+	.scr_write		= qs_scr_write,
+	.port_start		= qs_port_start,
+	.port_stop		= qs_port_stop,
+	.host_stop		= qs_host_stop,
+	.bmdma_stop		= qs_bmdma_stop,
+	.bmdma_status		= qs_bmdma_status,
+};
+
+static const struct ata_port_info qs_port_info[] = {
+	/* board_2068_idx */
+	{
+		.sht		= &qs_ata_sht,
+		.host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+				  ATA_FLAG_SATA_RESET |
+				  //FIXME ATA_FLAG_SRST |
+				  ATA_FLAG_MMIO | ATA_FLAG_PIO_POLLING,
+		.pio_mask	= 0x10, /* pio4 */
+		.udma_mask	= 0x7f, /* udma0-6 */
+		.port_ops	= &qs_ata_ops,
+	},
+};
+
+static const struct pci_device_id qs_ata_pci_tbl[] = {
+	{ PCI_VENDOR_ID_PDC, 0x2068, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_2068_idx },
+
+	{ }	/* terminate list */
+};
+
+static struct pci_driver qs_ata_pci_driver = {
+	.name			= DRV_NAME,
+	.id_table		= qs_ata_pci_tbl,
+	.probe			= qs_ata_init_one,
+	.remove			= ata_pci_remove_one,
+};
+
+static int qs_check_atapi_dma(struct ata_queued_cmd *qc)
+{
+	return 1;	/* ATAPI DMA not supported */
+}
+
+static void qs_bmdma_stop(struct ata_queued_cmd *qc)
+{
+	/* nothing */
+}
+
+static u8 qs_bmdma_status(struct ata_port *ap)
+{
+	return 0;
+}
+
+static void qs_irq_clear(struct ata_port *ap)
+{
+	/* nothing */
+}
+
+static inline void qs_enter_reg_mode(struct ata_port *ap)
+{
+	u8 __iomem *chan = ap->host_set->mmio_base + (ap->port_no * 0x4000);
+
+	writeb(QS_CTR0_REG, chan + QS_CCT_CTR0);
+	readb(chan + QS_CCT_CTR0);        /* flush */
+}
+
+static inline void qs_reset_channel_logic(struct ata_port *ap)
+{
+	u8 __iomem *chan = ap->host_set->mmio_base + (ap->port_no * 0x4000);
+
+	writeb(QS_CTR1_RCHN, chan + QS_CCT_CTR1);
+	readb(chan + QS_CCT_CTR0);        /* flush */
+	qs_enter_reg_mode(ap);
+}
+
+static void qs_phy_reset(struct ata_port *ap)
+{
+	struct qs_port_priv *pp = ap->private_data;
+
+	pp->state = qs_state_idle;
+	qs_reset_channel_logic(ap);
+	sata_phy_reset(ap);
+}
+
+static void qs_eng_timeout(struct ata_port *ap)
+{
+	struct qs_port_priv *pp = ap->private_data;
+
+	if (pp->state != qs_state_idle) /* healthy paranoia */
+		pp->state = qs_state_mmio;
+	qs_reset_channel_logic(ap);
+	ata_eng_timeout(ap);
+}
+
+static u32 qs_scr_read (struct ata_port *ap, unsigned int sc_reg)
+{
+	if (sc_reg > SCR_CONTROL)
+		return ~0U;
+	return readl((void __iomem *)(ap->ioaddr.scr_addr + (sc_reg * 8)));
+}
+
+static void qs_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val)
+{
+	if (sc_reg > SCR_CONTROL)
+		return;
+	writel(val, (void __iomem *)(ap->ioaddr.scr_addr + (sc_reg * 8)));
+}
+
+static unsigned int qs_fill_sg(struct ata_queued_cmd *qc)
+{
+	struct scatterlist *sg;
+	struct ata_port *ap = qc->ap;
+	struct qs_port_priv *pp = ap->private_data;
+	unsigned int nelem;
+	u8 *prd = pp->pkt + QS_CPB_BYTES;
+
+	WARN_ON(qc->__sg == NULL);
+	WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
+
+	nelem = 0;
+	ata_for_each_sg(sg, qc) {
+		u64 addr;
+		u32 len;
+
+		addr = sg_dma_address(sg);
+		*(__le64 *)prd = cpu_to_le64(addr);
+		prd += sizeof(u64);
+
+		len = sg_dma_len(sg);
+		*(__le32 *)prd = cpu_to_le32(len);
+		prd += sizeof(u64);
+
+		VPRINTK("PRD[%u] = (0x%llX, 0x%X)\n", nelem,
+					(unsigned long long)addr, len);
+		nelem++;
+	}
+
+	return nelem;
+}
+
+static void qs_qc_prep(struct ata_queued_cmd *qc)
+{
+	struct qs_port_priv *pp = qc->ap->private_data;
+	u8 dflags = QS_DF_PORD, *buf = pp->pkt;
+	u8 hflags = QS_HF_DAT | QS_HF_IEN | QS_HF_VLD;
+	u64 addr;
+	unsigned int nelem;
+
+	VPRINTK("ENTER\n");
+
+	qs_enter_reg_mode(qc->ap);
+	if (qc->tf.protocol != ATA_PROT_DMA) {
+		ata_qc_prep(qc);
+		return;
+	}
+
+	nelem = qs_fill_sg(qc);
+
+	if ((qc->tf.flags & ATA_TFLAG_WRITE))
+		hflags |= QS_HF_DIRO;
+	if ((qc->tf.flags & ATA_TFLAG_LBA48))
+		dflags |= QS_DF_ELBA;
+
+	/* host control block (HCB) */
+	buf[ 0] = QS_HCB_HDR;
+	buf[ 1] = hflags;
+	*(__le32 *)(&buf[ 4]) = cpu_to_le32(qc->nsect * ATA_SECT_SIZE);
+	*(__le32 *)(&buf[ 8]) = cpu_to_le32(nelem);
+	addr = ((u64)pp->pkt_dma) + QS_CPB_BYTES;
+	*(__le64 *)(&buf[16]) = cpu_to_le64(addr);
+
+	/* device control block (DCB) */
+	buf[24] = QS_DCB_HDR;
+	buf[28] = dflags;
+
+	/* frame information structure (FIS) */
+	ata_tf_to_fis(&qc->tf, &buf[32], 0);
+}
+
+static inline void qs_packet_start(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	u8 __iomem *chan = ap->host_set->mmio_base + (ap->port_no * 0x4000);
+
+	VPRINTK("ENTER, ap %p\n", ap);
+
+	writeb(QS_CTR0_CLER, chan + QS_CCT_CTR0);
+	wmb();                             /* flush PRDs and pkt to memory */
+	writel(QS_CCF_RUN_PKT, chan + QS_CCT_CFF);
+	readl(chan + QS_CCT_CFF);          /* flush */
+}
+
+static unsigned int qs_qc_issue(struct ata_queued_cmd *qc)
+{
+	struct qs_port_priv *pp = qc->ap->private_data;
+
+	switch (qc->tf.protocol) {
+	case ATA_PROT_DMA:
+
+		pp->state = qs_state_pkt;
+		qs_packet_start(qc);
+		return 0;
+
+	case ATA_PROT_ATAPI_DMA:
+		BUG();
+		break;
+
+	default:
+		break;
+	}
+
+	pp->state = qs_state_mmio;
+	return ata_qc_issue_prot(qc);
+}
+
+static inline unsigned int qs_intr_pkt(struct ata_host_set *host_set)
+{
+	unsigned int handled = 0;
+	u8 sFFE;
+	u8 __iomem *mmio_base = host_set->mmio_base;
+
+	do {
+		u32 sff0 = readl(mmio_base + QS_HST_SFF);
+		u32 sff1 = readl(mmio_base + QS_HST_SFF + 4);
+		u8 sEVLD = (sff1 >> 30) & 0x01;	/* valid flag */
+		sFFE  = sff1 >> 31;		/* empty flag */
+
+		if (sEVLD) {
+			u8 sDST = sff0 >> 16;	/* dev status */
+			u8 sHST = sff1 & 0x3f;	/* host status */
+			unsigned int port_no = (sff1 >> 8) & 0x03;
+			struct ata_port *ap = host_set->ports[port_no];
+
+			DPRINTK("SFF=%08x%08x: sCHAN=%u sHST=%d sDST=%02x\n",
+					sff1, sff0, port_no, sHST, sDST);
+			handled = 1;
+			if (ap && !(ap->flags & ATA_FLAG_DISABLED)) {
+				struct ata_queued_cmd *qc;
+				struct qs_port_priv *pp = ap->private_data;
+				if (!pp || pp->state != qs_state_pkt)
+					continue;
+				qc = ata_qc_from_tag(ap, ap->active_tag);
+				if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
+					switch (sHST) {
+					case 0: /* successful CPB */
+					case 3: /* device error */
+						pp->state = qs_state_idle;
+						qs_enter_reg_mode(qc->ap);
+						qc->err_mask |= ac_err_mask(sDST);
+						ata_qc_complete(qc);
+						break;
+					default:
+						break;
+					}
+				}
+			}
+		}
+	} while (!sFFE);
+	return handled;
+}
+
+static inline unsigned int qs_intr_mmio(struct ata_host_set *host_set)
+{
+	unsigned int handled = 0, port_no;
+
+	for (port_no = 0; port_no < host_set->n_ports; ++port_no) {
+		struct ata_port *ap;
+		ap = host_set->ports[port_no];
+		if (ap &&
+		    !(ap->flags & ATA_FLAG_DISABLED)) {
+			struct ata_queued_cmd *qc;
+			struct qs_port_priv *pp = ap->private_data;
+			if (!pp || pp->state != qs_state_mmio)
+				continue;
+			qc = ata_qc_from_tag(ap, ap->active_tag);
+			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
+
+				/* check main status, clearing INTRQ */
+				u8 status = ata_check_status(ap);
+				if ((status & ATA_BUSY))
+					continue;
+				DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
+					ap->id, qc->tf.protocol, status);
+
+				/* complete taskfile transaction */
+				pp->state = qs_state_idle;
+				qc->err_mask |= ac_err_mask(status);
+				ata_qc_complete(qc);
+				handled = 1;
+			}
+		}
+	}
+	return handled;
+}
+
+static irqreturn_t qs_intr(int irq, void *dev_instance, struct pt_regs *regs)
+{
+	struct ata_host_set *host_set = dev_instance;
+	unsigned int handled = 0;
+
+	VPRINTK("ENTER\n");
+
+	spin_lock(&host_set->lock);
+	handled  = qs_intr_pkt(host_set) | qs_intr_mmio(host_set);
+	spin_unlock(&host_set->lock);
+
+	VPRINTK("EXIT\n");
+
+	return IRQ_RETVAL(handled);
+}
+
+static void qs_ata_setup_port(struct ata_ioports *port, unsigned long base)
+{
+	port->cmd_addr		=
+	port->data_addr		= base + 0x400;
+	port->error_addr	=
+	port->feature_addr	= base + 0x408; /* hob_feature = 0x409 */
+	port->nsect_addr	= base + 0x410; /* hob_nsect   = 0x411 */
+	port->lbal_addr		= base + 0x418; /* hob_lbal    = 0x419 */
+	port->lbam_addr		= base + 0x420; /* hob_lbam    = 0x421 */
+	port->lbah_addr		= base + 0x428; /* hob_lbah    = 0x429 */
+	port->device_addr	= base + 0x430;
+	port->status_addr	=
+	port->command_addr	= base + 0x438;
+	port->altstatus_addr	=
+	port->ctl_addr		= base + 0x440;
+	port->scr_addr		= base + 0xc00;
+}
+
+static int qs_port_start(struct ata_port *ap)
+{
+	struct device *dev = ap->host_set->dev;
+	struct qs_port_priv *pp;
+	void __iomem *mmio_base = ap->host_set->mmio_base;
+	void __iomem *chan = mmio_base + (ap->port_no * 0x4000);
+	u64 addr;
+	int rc;
+
+	rc = ata_port_start(ap);
+	if (rc)
+		return rc;
+	qs_enter_reg_mode(ap);
+	pp = kzalloc(sizeof(*pp), GFP_KERNEL);
+	if (!pp) {
+		rc = -ENOMEM;
+		goto err_out;
+	}
+	pp->pkt = dma_alloc_coherent(dev, QS_PKT_BYTES, &pp->pkt_dma,
+								GFP_KERNEL);
+	if (!pp->pkt) {
+		rc = -ENOMEM;
+		goto err_out_kfree;
+	}
+	memset(pp->pkt, 0, QS_PKT_BYTES);
+	ap->private_data = pp;
+
+	addr = (u64)pp->pkt_dma;
+	writel((u32) addr,        chan + QS_CCF_CPBA);
+	writel((u32)(addr >> 32), chan + QS_CCF_CPBA + 4);
+	return 0;
+
+err_out_kfree:
+	kfree(pp);
+err_out:
+	ata_port_stop(ap);
+	return rc;
+}
+
+static void qs_port_stop(struct ata_port *ap)
+{
+	struct device *dev = ap->host_set->dev;
+	struct qs_port_priv *pp = ap->private_data;
+
+	if (pp != NULL) {
+		ap->private_data = NULL;
+		if (pp->pkt != NULL)
+			dma_free_coherent(dev, QS_PKT_BYTES, pp->pkt,
+								pp->pkt_dma);
+		kfree(pp);
+	}
+	ata_port_stop(ap);
+}
+
+static void qs_host_stop(struct ata_host_set *host_set)
+{
+	void __iomem *mmio_base = host_set->mmio_base;
+	struct pci_dev *pdev = to_pci_dev(host_set->dev);
+
+	writeb(0, mmio_base + QS_HCT_CTRL); /* disable host interrupts */
+	writeb(QS_CNFG3_GSRST, mmio_base + QS_HCF_CNFG3); /* global reset */
+
+	pci_iounmap(pdev, mmio_base);
+}
+
+static void qs_host_init(unsigned int chip_id, struct ata_probe_ent *pe)
+{
+	void __iomem *mmio_base = pe->mmio_base;
+	unsigned int port_no;
+
+	writeb(0, mmio_base + QS_HCT_CTRL); /* disable host interrupts */
+	writeb(QS_CNFG3_GSRST, mmio_base + QS_HCF_CNFG3); /* global reset */
+
+	/* reset each channel in turn */
+	for (port_no = 0; port_no < pe->n_ports; ++port_no) {
+		u8 __iomem *chan = mmio_base + (port_no * 0x4000);
+		writeb(QS_CTR1_RDEV|QS_CTR1_RCHN, chan + QS_CCT_CTR1);
+		writeb(QS_CTR0_REG, chan + QS_CCT_CTR0);
+		readb(chan + QS_CCT_CTR0);        /* flush */
+	}
+	writeb(QS_SERD3_PHY_ENA, mmio_base + QS_HVS_SERD3); /* enable phy */
+
+	for (port_no = 0; port_no < pe->n_ports; ++port_no) {
+		u8 __iomem *chan = mmio_base + (port_no * 0x4000);
+		/* set FIFO depths to same settings as Windows driver */
+		writew(32, chan + QS_CFC_HUFT);
+		writew(32, chan + QS_CFC_HDFT);
+		writew(10, chan + QS_CFC_DUFT);
+		writew( 8, chan + QS_CFC_DDFT);
+		/* set CPB size in bytes, as a power of two */
+		writeb(QS_CPB_ORDER,    chan + QS_CCF_CSEP);
+	}
+	writeb(1, mmio_base + QS_HCT_CTRL); /* enable host interrupts */
+}
+
+/*
+ * The QStor understands 64-bit buses, and uses 64-bit fields
+ * for DMA pointers regardless of bus width.  We just have to
+ * make sure our DMA masks are set appropriately for whatever
+ * bridge lies between us and the QStor, and then the DMA mapping
+ * code will ensure we only ever "see" appropriate buffer addresses.
+ * If we're 32-bit limited somewhere, then our 64-bit fields will
+ * just end up with zeros in the upper 32-bits, without any special
+ * logic required outside of this routine (below).
+ */
+static int qs_set_dma_masks(struct pci_dev *pdev, void __iomem *mmio_base)
+{
+	u32 bus_info = readl(mmio_base + QS_HID_HPHY);
+	int rc, have_64bit_bus = (bus_info & QS_HPHY_64BIT);
+
+	if (have_64bit_bus &&
+	    !pci_set_dma_mask(pdev, DMA_64BIT_MASK)) {
+		rc = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK);
+		if (rc) {
+			rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
+			if (rc) {
+				dev_printk(KERN_ERR, &pdev->dev,
+					   "64-bit DMA enable failed\n");
+				return rc;
+			}
+		}
+	} else {
+		rc = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
+		if (rc) {
+			dev_printk(KERN_ERR, &pdev->dev,
+				"32-bit DMA enable failed\n");
+			return rc;
+		}
+		rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
+		if (rc) {
+			dev_printk(KERN_ERR, &pdev->dev,
+				"32-bit consistent DMA enable failed\n");
+			return rc;
+		}
+	}
+	return 0;
+}
+
+static int qs_ata_init_one(struct pci_dev *pdev,
+				const struct pci_device_id *ent)
+{
+	static int printed_version;
+	struct ata_probe_ent *probe_ent = NULL;
+	void __iomem *mmio_base;
+	unsigned int board_idx = (unsigned int) ent->driver_data;
+	int rc, port_no;
+
+	if (!printed_version++)
+		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
+
+	rc = pci_enable_device(pdev);
+	if (rc)
+		return rc;
+
+	rc = pci_request_regions(pdev, DRV_NAME);
+	if (rc)
+		goto err_out;
+
+	if ((pci_resource_flags(pdev, 4) & IORESOURCE_MEM) == 0) {
+		rc = -ENODEV;
+		goto err_out_regions;
+	}
+
+	mmio_base = pci_iomap(pdev, 4, 0);
+	if (mmio_base == NULL) {
+		rc = -ENOMEM;
+		goto err_out_regions;
+	}
+
+	rc = qs_set_dma_masks(pdev, mmio_base);
+	if (rc)
+		goto err_out_iounmap;
+
+	probe_ent = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
+	if (probe_ent == NULL) {
+		rc = -ENOMEM;
+		goto err_out_iounmap;
+	}
+
+	memset(probe_ent, 0, sizeof(*probe_ent));
+	probe_ent->dev = pci_dev_to_dev(pdev);
+	INIT_LIST_HEAD(&probe_ent->node);
+
+	probe_ent->sht		= qs_port_info[board_idx].sht;
+	probe_ent->host_flags	= qs_port_info[board_idx].host_flags;
+	probe_ent->pio_mask	= qs_port_info[board_idx].pio_mask;
+	probe_ent->mwdma_mask	= qs_port_info[board_idx].mwdma_mask;
+	probe_ent->udma_mask	= qs_port_info[board_idx].udma_mask;
+	probe_ent->port_ops	= qs_port_info[board_idx].port_ops;
+
+	probe_ent->irq		= pdev->irq;
+	probe_ent->irq_flags	= IRQF_SHARED;
+	probe_ent->mmio_base	= mmio_base;
+	probe_ent->n_ports	= QS_PORTS;
+
+	for (port_no = 0; port_no < probe_ent->n_ports; ++port_no) {
+		unsigned long chan = (unsigned long)mmio_base +
+							(port_no * 0x4000);
+		qs_ata_setup_port(&probe_ent->port[port_no], chan);
+	}
+
+	pci_set_master(pdev);
+
+	/* initialize adapter */
+	qs_host_init(board_idx, probe_ent);
+
+	rc = ata_device_add(probe_ent);
+	kfree(probe_ent);
+	if (rc != QS_PORTS)
+		goto err_out_iounmap;
+	return 0;
+
+err_out_iounmap:
+	pci_iounmap(pdev, mmio_base);
+err_out_regions:
+	pci_release_regions(pdev);
+err_out:
+	pci_disable_device(pdev);
+	return rc;
+}
+
+static int __init qs_ata_init(void)
+{
+	return pci_register_driver(&qs_ata_pci_driver);
+}
+
+static void __exit qs_ata_exit(void)
+{
+	pci_unregister_driver(&qs_ata_pci_driver);
+}
+
+MODULE_AUTHOR("Mark Lord");
+MODULE_DESCRIPTION("Pacific Digital Corporation QStor SATA low-level driver");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, qs_ata_pci_tbl);
+MODULE_VERSION(DRV_VERSION);
+
+module_init(qs_ata_init);
+module_exit(qs_ata_exit);
diff --git a/drivers/ata/sata_sil.c b/drivers/ata/sata_sil.c
new file mode 100644
index 0000000..907faa8
--- /dev/null
+++ b/drivers/ata/sata_sil.c
@@ -0,0 +1,723 @@
+/*
+ *  sata_sil.c - Silicon Image SATA
+ *
+ *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
+ *  		    Please ALWAYS copy linux-ide@vger.kernel.org
+ *		    on emails.
+ *
+ *  Copyright 2003-2005 Red Hat, Inc.
+ *  Copyright 2003 Benjamin Herrenschmidt
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ *  libata documentation is available via 'make {ps|pdf}docs',
+ *  as Documentation/DocBook/libata.*
+ *
+ *  Documentation for SiI 3112:
+ *  http://gkernel.sourceforge.net/specs/sii/3112A_SiI-DS-0095-B2.pdf.bz2
+ *
+ *  Other errata and documentation available under NDA.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+
+#define DRV_NAME	"sata_sil"
+#define DRV_VERSION	"2.0"
+
+enum {
+	/*
+	 * host flags
+	 */
+	SIL_FLAG_NO_SATA_IRQ	= (1 << 28),
+	SIL_FLAG_RERR_ON_DMA_ACT = (1 << 29),
+	SIL_FLAG_MOD15WRITE	= (1 << 30),
+
+	SIL_DFL_HOST_FLAGS	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+				  ATA_FLAG_MMIO | ATA_FLAG_HRST_TO_RESUME,
+
+	/*
+	 * Controller IDs
+	 */
+	sil_3112		= 0,
+	sil_3112_no_sata_irq	= 1,
+	sil_3512		= 2,
+	sil_3114		= 3,
+
+	/*
+	 * Register offsets
+	 */
+	SIL_SYSCFG		= 0x48,
+
+	/*
+	 * Register bits
+	 */
+	/* SYSCFG */
+	SIL_MASK_IDE0_INT	= (1 << 22),
+	SIL_MASK_IDE1_INT	= (1 << 23),
+	SIL_MASK_IDE2_INT	= (1 << 24),
+	SIL_MASK_IDE3_INT	= (1 << 25),
+	SIL_MASK_2PORT		= SIL_MASK_IDE0_INT | SIL_MASK_IDE1_INT,
+	SIL_MASK_4PORT		= SIL_MASK_2PORT |
+				  SIL_MASK_IDE2_INT | SIL_MASK_IDE3_INT,
+
+	/* BMDMA/BMDMA2 */
+	SIL_INTR_STEERING	= (1 << 1),
+
+	SIL_DMA_ENABLE		= (1 << 0),  /* DMA run switch */
+	SIL_DMA_RDWR		= (1 << 3),  /* DMA Rd-Wr */
+	SIL_DMA_SATA_IRQ	= (1 << 4),  /* OR of all SATA IRQs */
+	SIL_DMA_ACTIVE		= (1 << 16), /* DMA running */
+	SIL_DMA_ERROR		= (1 << 17), /* PCI bus error */
+	SIL_DMA_COMPLETE	= (1 << 18), /* cmd complete / IRQ pending */
+	SIL_DMA_N_SATA_IRQ	= (1 << 6),  /* SATA_IRQ for the next channel */
+	SIL_DMA_N_ACTIVE	= (1 << 24), /* ACTIVE for the next channel */
+	SIL_DMA_N_ERROR		= (1 << 25), /* ERROR for the next channel */
+	SIL_DMA_N_COMPLETE	= (1 << 26), /* COMPLETE for the next channel */
+
+	/* SIEN */
+	SIL_SIEN_N		= (1 << 16), /* triggered by SError.N */
+
+	/*
+	 * Others
+	 */
+	SIL_QUIRK_MOD15WRITE	= (1 << 0),
+	SIL_QUIRK_UDMA5MAX	= (1 << 1),
+};
+
+static int sil_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
+static int sil_pci_device_resume(struct pci_dev *pdev);
+static void sil_dev_config(struct ata_port *ap, struct ata_device *dev);
+static u32 sil_scr_read (struct ata_port *ap, unsigned int sc_reg);
+static void sil_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val);
+static void sil_post_set_mode (struct ata_port *ap);
+static irqreturn_t sil_interrupt(int irq, void *dev_instance,
+				 struct pt_regs *regs);
+static void sil_freeze(struct ata_port *ap);
+static void sil_thaw(struct ata_port *ap);
+
+
+static const struct pci_device_id sil_pci_tbl[] = {
+	{ 0x1095, 0x3112, PCI_ANY_ID, PCI_ANY_ID, 0, 0, sil_3112 },
+	{ 0x1095, 0x0240, PCI_ANY_ID, PCI_ANY_ID, 0, 0, sil_3112 },
+	{ 0x1095, 0x3512, PCI_ANY_ID, PCI_ANY_ID, 0, 0, sil_3512 },
+	{ 0x1095, 0x3114, PCI_ANY_ID, PCI_ANY_ID, 0, 0, sil_3114 },
+	{ 0x1002, 0x436e, PCI_ANY_ID, PCI_ANY_ID, 0, 0, sil_3112 },
+	{ 0x1002, 0x4379, PCI_ANY_ID, PCI_ANY_ID, 0, 0, sil_3112_no_sata_irq },
+	{ 0x1002, 0x437a, PCI_ANY_ID, PCI_ANY_ID, 0, 0, sil_3112_no_sata_irq },
+	{ }	/* terminate list */
+};
+
+
+/* TODO firmware versions should be added - eric */
+static const struct sil_drivelist {
+	const char * product;
+	unsigned int quirk;
+} sil_blacklist [] = {
+	{ "ST320012AS",		SIL_QUIRK_MOD15WRITE },
+	{ "ST330013AS",		SIL_QUIRK_MOD15WRITE },
+	{ "ST340017AS",		SIL_QUIRK_MOD15WRITE },
+	{ "ST360015AS",		SIL_QUIRK_MOD15WRITE },
+	{ "ST380023AS",		SIL_QUIRK_MOD15WRITE },
+	{ "ST3120023AS",	SIL_QUIRK_MOD15WRITE },
+	{ "ST340014ASL",	SIL_QUIRK_MOD15WRITE },
+	{ "ST360014ASL",	SIL_QUIRK_MOD15WRITE },
+	{ "ST380011ASL",	SIL_QUIRK_MOD15WRITE },
+	{ "ST3120022ASL",	SIL_QUIRK_MOD15WRITE },
+	{ "ST3160021ASL",	SIL_QUIRK_MOD15WRITE },
+	{ "Maxtor 4D060H3",	SIL_QUIRK_UDMA5MAX },
+	{ }
+};
+
+static struct pci_driver sil_pci_driver = {
+	.name			= DRV_NAME,
+	.id_table		= sil_pci_tbl,
+	.probe			= sil_init_one,
+	.remove			= ata_pci_remove_one,
+	.suspend		= ata_pci_device_suspend,
+	.resume			= sil_pci_device_resume,
+};
+
+static struct scsi_host_template sil_sht = {
+	.module			= THIS_MODULE,
+	.name			= DRV_NAME,
+	.ioctl			= ata_scsi_ioctl,
+	.queuecommand		= ata_scsi_queuecmd,
+	.can_queue		= ATA_DEF_QUEUE,
+	.this_id		= ATA_SHT_THIS_ID,
+	.sg_tablesize		= LIBATA_MAX_PRD,
+	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
+	.emulated		= ATA_SHT_EMULATED,
+	.use_clustering		= ATA_SHT_USE_CLUSTERING,
+	.proc_name		= DRV_NAME,
+	.dma_boundary		= ATA_DMA_BOUNDARY,
+	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
+	.bios_param		= ata_std_bios_param,
+	.suspend		= ata_scsi_device_suspend,
+	.resume			= ata_scsi_device_resume,
+};
+
+static const struct ata_port_operations sil_ops = {
+	.port_disable		= ata_port_disable,
+	.dev_config		= sil_dev_config,
+	.tf_load		= ata_tf_load,
+	.tf_read		= ata_tf_read,
+	.check_status		= ata_check_status,
+	.exec_command		= ata_exec_command,
+	.dev_select		= ata_std_dev_select,
+	.post_set_mode		= sil_post_set_mode,
+	.bmdma_setup            = ata_bmdma_setup,
+	.bmdma_start            = ata_bmdma_start,
+	.bmdma_stop		= ata_bmdma_stop,
+	.bmdma_status		= ata_bmdma_status,
+	.qc_prep		= ata_qc_prep,
+	.qc_issue		= ata_qc_issue_prot,
+	.data_xfer		= ata_mmio_data_xfer,
+	.freeze			= sil_freeze,
+	.thaw			= sil_thaw,
+	.error_handler		= ata_bmdma_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
+	.irq_handler		= sil_interrupt,
+	.irq_clear		= ata_bmdma_irq_clear,
+	.scr_read		= sil_scr_read,
+	.scr_write		= sil_scr_write,
+	.port_start		= ata_port_start,
+	.port_stop		= ata_port_stop,
+	.host_stop		= ata_pci_host_stop,
+};
+
+static const struct ata_port_info sil_port_info[] = {
+	/* sil_3112 */
+	{
+		.sht		= &sil_sht,
+		.host_flags	= SIL_DFL_HOST_FLAGS | SIL_FLAG_MOD15WRITE,
+		.pio_mask	= 0x1f,			/* pio0-4 */
+		.mwdma_mask	= 0x07,			/* mwdma0-2 */
+		.udma_mask	= 0x3f,			/* udma0-5 */
+		.port_ops	= &sil_ops,
+	},
+	/* sil_3112_no_sata_irq */
+	{
+		.sht		= &sil_sht,
+		.host_flags	= SIL_DFL_HOST_FLAGS | SIL_FLAG_MOD15WRITE |
+				  SIL_FLAG_NO_SATA_IRQ,
+		.pio_mask	= 0x1f,			/* pio0-4 */
+		.mwdma_mask	= 0x07,			/* mwdma0-2 */
+		.udma_mask	= 0x3f,			/* udma0-5 */
+		.port_ops	= &sil_ops,
+	},
+	/* sil_3512 */
+	{
+		.sht		= &sil_sht,
+		.host_flags	= SIL_DFL_HOST_FLAGS | SIL_FLAG_RERR_ON_DMA_ACT,
+		.pio_mask	= 0x1f,			/* pio0-4 */
+		.mwdma_mask	= 0x07,			/* mwdma0-2 */
+		.udma_mask	= 0x3f,			/* udma0-5 */
+		.port_ops	= &sil_ops,
+	},
+	/* sil_3114 */
+	{
+		.sht		= &sil_sht,
+		.host_flags	= SIL_DFL_HOST_FLAGS | SIL_FLAG_RERR_ON_DMA_ACT,
+		.pio_mask	= 0x1f,			/* pio0-4 */
+		.mwdma_mask	= 0x07,			/* mwdma0-2 */
+		.udma_mask	= 0x3f,			/* udma0-5 */
+		.port_ops	= &sil_ops,
+	},
+};
+
+/* per-port register offsets */
+/* TODO: we can probably calculate rather than use a table */
+static const struct {
+	unsigned long tf;	/* ATA taskfile register block */
+	unsigned long ctl;	/* ATA control/altstatus register block */
+	unsigned long bmdma;	/* DMA register block */
+	unsigned long bmdma2;	/* DMA register block #2 */
+	unsigned long fifo_cfg;	/* FIFO Valid Byte Count and Control */
+	unsigned long scr;	/* SATA control register block */
+	unsigned long sien;	/* SATA Interrupt Enable register */
+	unsigned long xfer_mode;/* data transfer mode register */
+	unsigned long sfis_cfg;	/* SATA FIS reception config register */
+} sil_port[] = {
+	/* port 0 ... */
+	{ 0x80, 0x8A, 0x00, 0x10, 0x40, 0x100, 0x148, 0xb4, 0x14c },
+	{ 0xC0, 0xCA, 0x08, 0x18, 0x44, 0x180, 0x1c8, 0xf4, 0x1cc },
+	{ 0x280, 0x28A, 0x200, 0x210, 0x240, 0x300, 0x348, 0x2b4, 0x34c },
+	{ 0x2C0, 0x2CA, 0x208, 0x218, 0x244, 0x380, 0x3c8, 0x2f4, 0x3cc },
+	/* ... port 3 */
+};
+
+MODULE_AUTHOR("Jeff Garzik");
+MODULE_DESCRIPTION("low-level driver for Silicon Image SATA controller");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, sil_pci_tbl);
+MODULE_VERSION(DRV_VERSION);
+
+static int slow_down = 0;
+module_param(slow_down, int, 0444);
+MODULE_PARM_DESC(slow_down, "Sledgehammer used to work around random problems, by limiting commands to 15 sectors (0=off, 1=on)");
+
+
+static unsigned char sil_get_device_cache_line(struct pci_dev *pdev)
+{
+	u8 cache_line = 0;
+	pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &cache_line);
+	return cache_line;
+}
+
+static void sil_post_set_mode (struct ata_port *ap)
+{
+	struct ata_host_set *host_set = ap->host_set;
+	struct ata_device *dev;
+	void __iomem *addr =
+		host_set->mmio_base + sil_port[ap->port_no].xfer_mode;
+	u32 tmp, dev_mode[2];
+	unsigned int i;
+
+	for (i = 0; i < 2; i++) {
+		dev = &ap->device[i];
+		if (!ata_dev_enabled(dev))
+			dev_mode[i] = 0;	/* PIO0/1/2 */
+		else if (dev->flags & ATA_DFLAG_PIO)
+			dev_mode[i] = 1;	/* PIO3/4 */
+		else
+			dev_mode[i] = 3;	/* UDMA */
+		/* value 2 indicates MDMA */
+	}
+
+	tmp = readl(addr);
+	tmp &= ~((1<<5) | (1<<4) | (1<<1) | (1<<0));
+	tmp |= dev_mode[0];
+	tmp |= (dev_mode[1] << 4);
+	writel(tmp, addr);
+	readl(addr);	/* flush */
+}
+
+static inline unsigned long sil_scr_addr(struct ata_port *ap, unsigned int sc_reg)
+{
+	unsigned long offset = ap->ioaddr.scr_addr;
+
+	switch (sc_reg) {
+	case SCR_STATUS:
+		return offset + 4;
+	case SCR_ERROR:
+		return offset + 8;
+	case SCR_CONTROL:
+		return offset;
+	default:
+		/* do nothing */
+		break;
+	}
+
+	return 0;
+}
+
+static u32 sil_scr_read (struct ata_port *ap, unsigned int sc_reg)
+{
+	void __iomem *mmio = (void __iomem *) sil_scr_addr(ap, sc_reg);
+	if (mmio)
+		return readl(mmio);
+	return 0xffffffffU;
+}
+
+static void sil_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val)
+{
+	void *mmio = (void __iomem *) sil_scr_addr(ap, sc_reg);
+	if (mmio)
+		writel(val, mmio);
+}
+
+static void sil_host_intr(struct ata_port *ap, u32 bmdma2)
+{
+	struct ata_queued_cmd *qc = ata_qc_from_tag(ap, ap->active_tag);
+	u8 status;
+
+	if (unlikely(bmdma2 & SIL_DMA_SATA_IRQ)) {
+		u32 serror;
+
+		/* SIEN doesn't mask SATA IRQs on some 3112s.  Those
+		 * controllers continue to assert IRQ as long as
+		 * SError bits are pending.  Clear SError immediately.
+		 */
+		serror = sil_scr_read(ap, SCR_ERROR);
+		sil_scr_write(ap, SCR_ERROR, serror);
+
+		/* Trigger hotplug and accumulate SError only if the
+		 * port isn't already frozen.  Otherwise, PHY events
+		 * during hardreset makes controllers with broken SIEN
+		 * repeat probing needlessly.
+		 */
+		if (!(ap->pflags & ATA_PFLAG_FROZEN)) {
+			ata_ehi_hotplugged(&ap->eh_info);
+			ap->eh_info.serror |= serror;
+		}
+
+		goto freeze;
+	}
+
+	if (unlikely(!qc || qc->tf.ctl & ATA_NIEN))
+		goto freeze;
+
+	/* Check whether we are expecting interrupt in this state */
+	switch (ap->hsm_task_state) {
+	case HSM_ST_FIRST:
+		/* Some pre-ATAPI-4 devices assert INTRQ
+		 * at this state when ready to receive CDB.
+		 */
+
+		/* Check the ATA_DFLAG_CDB_INTR flag is enough here.
+		 * The flag was turned on only for atapi devices.
+		 * No need to check is_atapi_taskfile(&qc->tf) again.
+		 */
+		if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
+			goto err_hsm;
+		break;
+	case HSM_ST_LAST:
+		if (qc->tf.protocol == ATA_PROT_DMA ||
+		    qc->tf.protocol == ATA_PROT_ATAPI_DMA) {
+			/* clear DMA-Start bit */
+			ap->ops->bmdma_stop(qc);
+
+			if (bmdma2 & SIL_DMA_ERROR) {
+				qc->err_mask |= AC_ERR_HOST_BUS;
+				ap->hsm_task_state = HSM_ST_ERR;
+			}
+		}
+		break;
+	case HSM_ST:
+		break;
+	default:
+		goto err_hsm;
+	}
+
+	/* check main status, clearing INTRQ */
+	status = ata_chk_status(ap);
+	if (unlikely(status & ATA_BUSY))
+		goto err_hsm;
+
+	/* ack bmdma irq events */
+	ata_bmdma_irq_clear(ap);
+
+	/* kick HSM in the ass */
+	ata_hsm_move(ap, qc, status, 0);
+
+	return;
+
+ err_hsm:
+	qc->err_mask |= AC_ERR_HSM;
+ freeze:
+	ata_port_freeze(ap);
+}
+
+static irqreturn_t sil_interrupt(int irq, void *dev_instance,
+				 struct pt_regs *regs)
+{
+	struct ata_host_set *host_set = dev_instance;
+	void __iomem *mmio_base = host_set->mmio_base;
+	int handled = 0;
+	int i;
+
+	spin_lock(&host_set->lock);
+
+	for (i = 0; i < host_set->n_ports; i++) {
+		struct ata_port *ap = host_set->ports[i];
+		u32 bmdma2 = readl(mmio_base + sil_port[ap->port_no].bmdma2);
+
+		if (unlikely(!ap || ap->flags & ATA_FLAG_DISABLED))
+			continue;
+
+		/* turn off SATA_IRQ if not supported */
+		if (ap->flags & SIL_FLAG_NO_SATA_IRQ)
+			bmdma2 &= ~SIL_DMA_SATA_IRQ;
+
+		if (bmdma2 == 0xffffffff ||
+		    !(bmdma2 & (SIL_DMA_COMPLETE | SIL_DMA_SATA_IRQ)))
+			continue;
+
+		sil_host_intr(ap, bmdma2);
+		handled = 1;
+	}
+
+	spin_unlock(&host_set->lock);
+
+	return IRQ_RETVAL(handled);
+}
+
+static void sil_freeze(struct ata_port *ap)
+{
+	void __iomem *mmio_base = ap->host_set->mmio_base;
+	u32 tmp;
+
+	/* global IRQ mask doesn't block SATA IRQ, turn off explicitly */
+	writel(0, mmio_base + sil_port[ap->port_no].sien);
+
+	/* plug IRQ */
+	tmp = readl(mmio_base + SIL_SYSCFG);
+	tmp |= SIL_MASK_IDE0_INT << ap->port_no;
+	writel(tmp, mmio_base + SIL_SYSCFG);
+	readl(mmio_base + SIL_SYSCFG);	/* flush */
+}
+
+static void sil_thaw(struct ata_port *ap)
+{
+	void __iomem *mmio_base = ap->host_set->mmio_base;
+	u32 tmp;
+
+	/* clear IRQ */
+	ata_chk_status(ap);
+	ata_bmdma_irq_clear(ap);
+
+	/* turn on SATA IRQ if supported */
+	if (!(ap->flags & SIL_FLAG_NO_SATA_IRQ))
+		writel(SIL_SIEN_N, mmio_base + sil_port[ap->port_no].sien);
+
+	/* turn on IRQ */
+	tmp = readl(mmio_base + SIL_SYSCFG);
+	tmp &= ~(SIL_MASK_IDE0_INT << ap->port_no);
+	writel(tmp, mmio_base + SIL_SYSCFG);
+}
+
+/**
+ *	sil_dev_config - Apply device/host-specific errata fixups
+ *	@ap: Port containing device to be examined
+ *	@dev: Device to be examined
+ *
+ *	After the IDENTIFY [PACKET] DEVICE step is complete, and a
+ *	device is known to be present, this function is called.
+ *	We apply two errata fixups which are specific to Silicon Image,
+ *	a Seagate and a Maxtor fixup.
+ *
+ *	For certain Seagate devices, we must limit the maximum sectors
+ *	to under 8K.
+ *
+ *	For certain Maxtor devices, we must not program the drive
+ *	beyond udma5.
+ *
+ *	Both fixups are unfairly pessimistic.  As soon as I get more
+ *	information on these errata, I will create a more exhaustive
+ *	list, and apply the fixups to only the specific
+ *	devices/hosts/firmwares that need it.
+ *
+ *	20040111 - Seagate drives affected by the Mod15Write bug are blacklisted
+ *	The Maxtor quirk is in the blacklist, but I'm keeping the original
+ *	pessimistic fix for the following reasons...
+ *	- There seems to be less info on it, only one device gleaned off the
+ *	Windows	driver, maybe only one is affected.  More info would be greatly
+ *	appreciated.
+ *	- But then again UDMA5 is hardly anything to complain about
+ */
+static void sil_dev_config(struct ata_port *ap, struct ata_device *dev)
+{
+	unsigned int n, quirks = 0;
+	unsigned char model_num[41];
+
+	ata_id_c_string(dev->id, model_num, ATA_ID_PROD_OFS, sizeof(model_num));
+
+	for (n = 0; sil_blacklist[n].product; n++)
+		if (!strcmp(sil_blacklist[n].product, model_num)) {
+			quirks = sil_blacklist[n].quirk;
+			break;
+		}
+
+	/* limit requests to 15 sectors */
+	if (slow_down ||
+	    ((ap->flags & SIL_FLAG_MOD15WRITE) &&
+	     (quirks & SIL_QUIRK_MOD15WRITE))) {
+		ata_dev_printk(dev, KERN_INFO, "applying Seagate errata fix "
+			       "(mod15write workaround)\n");
+		dev->max_sectors = 15;
+		return;
+	}
+
+	/* limit to udma5 */
+	if (quirks & SIL_QUIRK_UDMA5MAX) {
+		ata_dev_printk(dev, KERN_INFO,
+			       "applying Maxtor errata fix %s\n", model_num);
+		dev->udma_mask &= ATA_UDMA5;
+		return;
+	}
+}
+
+static void sil_init_controller(struct pci_dev *pdev,
+				int n_ports, unsigned long host_flags,
+				void __iomem *mmio_base)
+{
+	u8 cls;
+	u32 tmp;
+	int i;
+
+	/* Initialize FIFO PCI bus arbitration */
+	cls = sil_get_device_cache_line(pdev);
+	if (cls) {
+		cls >>= 3;
+		cls++;  /* cls = (line_size/8)+1 */
+		for (i = 0; i < n_ports; i++)
+			writew(cls << 8 | cls,
+			       mmio_base + sil_port[i].fifo_cfg);
+	} else
+		dev_printk(KERN_WARNING, &pdev->dev,
+			   "cache line size not set.  Driver may not function\n");
+
+	/* Apply R_ERR on DMA activate FIS errata workaround */
+	if (host_flags & SIL_FLAG_RERR_ON_DMA_ACT) {
+		int cnt;
+
+		for (i = 0, cnt = 0; i < n_ports; i++) {
+			tmp = readl(mmio_base + sil_port[i].sfis_cfg);
+			if ((tmp & 0x3) != 0x01)
+				continue;
+			if (!cnt)
+				dev_printk(KERN_INFO, &pdev->dev,
+					   "Applying R_ERR on DMA activate "
+					   "FIS errata fix\n");
+			writel(tmp & ~0x3, mmio_base + sil_port[i].sfis_cfg);
+			cnt++;
+		}
+	}
+
+	if (n_ports == 4) {
+		/* flip the magic "make 4 ports work" bit */
+		tmp = readl(mmio_base + sil_port[2].bmdma);
+		if ((tmp & SIL_INTR_STEERING) == 0)
+			writel(tmp | SIL_INTR_STEERING,
+			       mmio_base + sil_port[2].bmdma);
+	}
+}
+
+static int sil_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	static int printed_version;
+	struct ata_probe_ent *probe_ent = NULL;
+	unsigned long base;
+	void __iomem *mmio_base;
+	int rc;
+	unsigned int i;
+	int pci_dev_busy = 0;
+
+	if (!printed_version++)
+		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
+
+	rc = pci_enable_device(pdev);
+	if (rc)
+		return rc;
+
+	rc = pci_request_regions(pdev, DRV_NAME);
+	if (rc) {
+		pci_dev_busy = 1;
+		goto err_out;
+	}
+
+	rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
+	if (rc)
+		goto err_out_regions;
+	rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
+	if (rc)
+		goto err_out_regions;
+
+	probe_ent = kzalloc(sizeof(*probe_ent), GFP_KERNEL);
+	if (probe_ent == NULL) {
+		rc = -ENOMEM;
+		goto err_out_regions;
+	}
+
+	INIT_LIST_HEAD(&probe_ent->node);
+	probe_ent->dev = pci_dev_to_dev(pdev);
+	probe_ent->port_ops = sil_port_info[ent->driver_data].port_ops;
+	probe_ent->sht = sil_port_info[ent->driver_data].sht;
+	probe_ent->n_ports = (ent->driver_data == sil_3114) ? 4 : 2;
+	probe_ent->pio_mask = sil_port_info[ent->driver_data].pio_mask;
+	probe_ent->mwdma_mask = sil_port_info[ent->driver_data].mwdma_mask;
+	probe_ent->udma_mask = sil_port_info[ent->driver_data].udma_mask;
+       	probe_ent->irq = pdev->irq;
+       	probe_ent->irq_flags = IRQF_SHARED;
+	probe_ent->host_flags = sil_port_info[ent->driver_data].host_flags;
+
+	mmio_base = pci_iomap(pdev, 5, 0);
+	if (mmio_base == NULL) {
+		rc = -ENOMEM;
+		goto err_out_free_ent;
+	}
+
+	probe_ent->mmio_base = mmio_base;
+
+	base = (unsigned long) mmio_base;
+
+	for (i = 0; i < probe_ent->n_ports; i++) {
+		probe_ent->port[i].cmd_addr = base + sil_port[i].tf;
+		probe_ent->port[i].altstatus_addr =
+		probe_ent->port[i].ctl_addr = base + sil_port[i].ctl;
+		probe_ent->port[i].bmdma_addr = base + sil_port[i].bmdma;
+		probe_ent->port[i].scr_addr = base + sil_port[i].scr;
+		ata_std_ports(&probe_ent->port[i]);
+	}
+
+	sil_init_controller(pdev, probe_ent->n_ports, probe_ent->host_flags,
+			    mmio_base);
+
+	pci_set_master(pdev);
+
+	/* FIXME: check ata_device_add return value */
+	ata_device_add(probe_ent);
+	kfree(probe_ent);
+
+	return 0;
+
+err_out_free_ent:
+	kfree(probe_ent);
+err_out_regions:
+	pci_release_regions(pdev);
+err_out:
+	if (!pci_dev_busy)
+		pci_disable_device(pdev);
+	return rc;
+}
+
+static int sil_pci_device_resume(struct pci_dev *pdev)
+{
+	struct ata_host_set *host_set = dev_get_drvdata(&pdev->dev);
+
+	ata_pci_device_do_resume(pdev);
+	sil_init_controller(pdev, host_set->n_ports, host_set->ports[0]->flags,
+			    host_set->mmio_base);
+	ata_host_set_resume(host_set);
+
+	return 0;
+}
+
+static int __init sil_init(void)
+{
+	return pci_register_driver(&sil_pci_driver);
+}
+
+static void __exit sil_exit(void)
+{
+	pci_unregister_driver(&sil_pci_driver);
+}
+
+
+module_init(sil_init);
+module_exit(sil_exit);
diff --git a/drivers/ata/sata_sil24.c b/drivers/ata/sata_sil24.c
new file mode 100644
index 0000000..3a0161d
--- /dev/null
+++ b/drivers/ata/sata_sil24.c
@@ -0,0 +1,1222 @@
+/*
+ * sata_sil24.c - Driver for Silicon Image 3124/3132 SATA-2 controllers
+ *
+ * Copyright 2005  Tejun Heo
+ *
+ * Based on preview driver from Silicon Image.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/dma-mapping.h>
+#include <linux/device.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_cmnd.h>
+#include <linux/libata.h>
+#include <asm/io.h>
+
+#define DRV_NAME	"sata_sil24"
+#define DRV_VERSION	"0.3"
+
+/*
+ * Port request block (PRB) 32 bytes
+ */
+struct sil24_prb {
+	__le16	ctrl;
+	__le16	prot;
+	__le32	rx_cnt;
+	u8	fis[6 * 4];
+};
+
+/*
+ * Scatter gather entry (SGE) 16 bytes
+ */
+struct sil24_sge {
+	__le64	addr;
+	__le32	cnt;
+	__le32	flags;
+};
+
+/*
+ * Port multiplier
+ */
+struct sil24_port_multiplier {
+	__le32	diag;
+	__le32	sactive;
+};
+
+enum {
+	/*
+	 * Global controller registers (128 bytes @ BAR0)
+	 */
+		/* 32 bit regs */
+	HOST_SLOT_STAT		= 0x00, /* 32 bit slot stat * 4 */
+	HOST_CTRL		= 0x40,
+	HOST_IRQ_STAT		= 0x44,
+	HOST_PHY_CFG		= 0x48,
+	HOST_BIST_CTRL		= 0x50,
+	HOST_BIST_PTRN		= 0x54,
+	HOST_BIST_STAT		= 0x58,
+	HOST_MEM_BIST_STAT	= 0x5c,
+	HOST_FLASH_CMD		= 0x70,
+		/* 8 bit regs */
+	HOST_FLASH_DATA		= 0x74,
+	HOST_TRANSITION_DETECT	= 0x75,
+	HOST_GPIO_CTRL		= 0x76,
+	HOST_I2C_ADDR		= 0x78, /* 32 bit */
+	HOST_I2C_DATA		= 0x7c,
+	HOST_I2C_XFER_CNT	= 0x7e,
+	HOST_I2C_CTRL		= 0x7f,
+
+	/* HOST_SLOT_STAT bits */
+	HOST_SSTAT_ATTN		= (1 << 31),
+
+	/* HOST_CTRL bits */
+	HOST_CTRL_M66EN		= (1 << 16), /* M66EN PCI bus signal */
+	HOST_CTRL_TRDY		= (1 << 17), /* latched PCI TRDY */
+	HOST_CTRL_STOP		= (1 << 18), /* latched PCI STOP */
+	HOST_CTRL_DEVSEL	= (1 << 19), /* latched PCI DEVSEL */
+	HOST_CTRL_REQ64		= (1 << 20), /* latched PCI REQ64 */
+	HOST_CTRL_GLOBAL_RST	= (1 << 31), /* global reset */
+
+	/*
+	 * Port registers
+	 * (8192 bytes @ +0x0000, +0x2000, +0x4000 and +0x6000 @ BAR2)
+	 */
+	PORT_REGS_SIZE		= 0x2000,
+
+	PORT_LRAM		= 0x0000, /* 31 LRAM slots and PM regs */
+	PORT_LRAM_SLOT_SZ	= 0x0080, /* 32 bytes PRB + 2 SGE, ACT... */
+
+	PORT_PM			= 0x0f80, /* 8 bytes PM * 16 (128 bytes) */
+		/* 32 bit regs */
+	PORT_CTRL_STAT		= 0x1000, /* write: ctrl-set, read: stat */
+	PORT_CTRL_CLR		= 0x1004, /* write: ctrl-clear */
+	PORT_IRQ_STAT		= 0x1008, /* high: status, low: interrupt */
+	PORT_IRQ_ENABLE_SET	= 0x1010, /* write: enable-set */
+	PORT_IRQ_ENABLE_CLR	= 0x1014, /* write: enable-clear */
+	PORT_ACTIVATE_UPPER_ADDR= 0x101c,
+	PORT_EXEC_FIFO		= 0x1020, /* command execution fifo */
+	PORT_CMD_ERR		= 0x1024, /* command error number */
+	PORT_FIS_CFG		= 0x1028,
+	PORT_FIFO_THRES		= 0x102c,
+		/* 16 bit regs */
+	PORT_DECODE_ERR_CNT	= 0x1040,
+	PORT_DECODE_ERR_THRESH	= 0x1042,
+	PORT_CRC_ERR_CNT	= 0x1044,
+	PORT_CRC_ERR_THRESH	= 0x1046,
+	PORT_HSHK_ERR_CNT	= 0x1048,
+	PORT_HSHK_ERR_THRESH	= 0x104a,
+		/* 32 bit regs */
+	PORT_PHY_CFG		= 0x1050,
+	PORT_SLOT_STAT		= 0x1800,
+	PORT_CMD_ACTIVATE	= 0x1c00, /* 64 bit cmd activate * 31 (248 bytes) */
+	PORT_EXEC_DIAG		= 0x1e00, /* 32bit exec diag * 16 (64 bytes, 0-10 used on 3124) */
+	PORT_PSD_DIAG		= 0x1e40, /* 32bit psd diag * 16 (64 bytes, 0-8 used on 3124) */
+	PORT_SCONTROL		= 0x1f00,
+	PORT_SSTATUS		= 0x1f04,
+	PORT_SERROR		= 0x1f08,
+	PORT_SACTIVE		= 0x1f0c,
+
+	/* PORT_CTRL_STAT bits */
+	PORT_CS_PORT_RST	= (1 << 0), /* port reset */
+	PORT_CS_DEV_RST		= (1 << 1), /* device reset */
+	PORT_CS_INIT		= (1 << 2), /* port initialize */
+	PORT_CS_IRQ_WOC		= (1 << 3), /* interrupt write one to clear */
+	PORT_CS_CDB16		= (1 << 5), /* 0=12b cdb, 1=16b cdb */
+	PORT_CS_RESUME		= (1 << 6), /* port resume */
+	PORT_CS_32BIT_ACTV	= (1 << 10), /* 32-bit activation */
+	PORT_CS_PM_EN		= (1 << 13), /* port multiplier enable */
+	PORT_CS_RDY		= (1 << 31), /* port ready to accept commands */
+
+	/* PORT_IRQ_STAT/ENABLE_SET/CLR */
+	/* bits[11:0] are masked */
+	PORT_IRQ_COMPLETE	= (1 << 0), /* command(s) completed */
+	PORT_IRQ_ERROR		= (1 << 1), /* command execution error */
+	PORT_IRQ_PORTRDY_CHG	= (1 << 2), /* port ready change */
+	PORT_IRQ_PWR_CHG	= (1 << 3), /* power management change */
+	PORT_IRQ_PHYRDY_CHG	= (1 << 4), /* PHY ready change */
+	PORT_IRQ_COMWAKE	= (1 << 5), /* COMWAKE received */
+	PORT_IRQ_UNK_FIS	= (1 << 6), /* unknown FIS received */
+	PORT_IRQ_DEV_XCHG	= (1 << 7), /* device exchanged */
+	PORT_IRQ_8B10B		= (1 << 8), /* 8b/10b decode error threshold */
+	PORT_IRQ_CRC		= (1 << 9), /* CRC error threshold */
+	PORT_IRQ_HANDSHAKE	= (1 << 10), /* handshake error threshold */
+	PORT_IRQ_SDB_NOTIFY	= (1 << 11), /* SDB notify received */
+
+	DEF_PORT_IRQ		= PORT_IRQ_COMPLETE | PORT_IRQ_ERROR |
+				  PORT_IRQ_PHYRDY_CHG | PORT_IRQ_DEV_XCHG |
+				  PORT_IRQ_UNK_FIS,
+
+	/* bits[27:16] are unmasked (raw) */
+	PORT_IRQ_RAW_SHIFT	= 16,
+	PORT_IRQ_MASKED_MASK	= 0x7ff,
+	PORT_IRQ_RAW_MASK	= (0x7ff << PORT_IRQ_RAW_SHIFT),
+
+	/* ENABLE_SET/CLR specific, intr steering - 2 bit field */
+	PORT_IRQ_STEER_SHIFT	= 30,
+	PORT_IRQ_STEER_MASK	= (3 << PORT_IRQ_STEER_SHIFT),
+
+	/* PORT_CMD_ERR constants */
+	PORT_CERR_DEV		= 1, /* Error bit in D2H Register FIS */
+	PORT_CERR_SDB		= 2, /* Error bit in SDB FIS */
+	PORT_CERR_DATA		= 3, /* Error in data FIS not detected by dev */
+	PORT_CERR_SEND		= 4, /* Initial cmd FIS transmission failure */
+	PORT_CERR_INCONSISTENT	= 5, /* Protocol mismatch */
+	PORT_CERR_DIRECTION	= 6, /* Data direction mismatch */
+	PORT_CERR_UNDERRUN	= 7, /* Ran out of SGEs while writing */
+	PORT_CERR_OVERRUN	= 8, /* Ran out of SGEs while reading */
+	PORT_CERR_PKT_PROT	= 11, /* DIR invalid in 1st PIO setup of ATAPI */
+	PORT_CERR_SGT_BOUNDARY	= 16, /* PLD ecode 00 - SGT not on qword boundary */
+	PORT_CERR_SGT_TGTABRT	= 17, /* PLD ecode 01 - target abort */
+	PORT_CERR_SGT_MSTABRT	= 18, /* PLD ecode 10 - master abort */
+	PORT_CERR_SGT_PCIPERR	= 19, /* PLD ecode 11 - PCI parity err while fetching SGT */
+	PORT_CERR_CMD_BOUNDARY	= 24, /* ctrl[15:13] 001 - PRB not on qword boundary */
+	PORT_CERR_CMD_TGTABRT	= 25, /* ctrl[15:13] 010 - target abort */
+	PORT_CERR_CMD_MSTABRT	= 26, /* ctrl[15:13] 100 - master abort */
+	PORT_CERR_CMD_PCIPERR	= 27, /* ctrl[15:13] 110 - PCI parity err while fetching PRB */
+	PORT_CERR_XFR_UNDEF	= 32, /* PSD ecode 00 - undefined */
+	PORT_CERR_XFR_TGTABRT	= 33, /* PSD ecode 01 - target abort */
+	PORT_CERR_XFR_MSTABRT	= 34, /* PSD ecode 10 - master abort */
+	PORT_CERR_XFR_PCIPERR	= 35, /* PSD ecode 11 - PCI prity err during transfer */
+	PORT_CERR_SENDSERVICE	= 36, /* FIS received while sending service */
+
+	/* bits of PRB control field */
+	PRB_CTRL_PROTOCOL	= (1 << 0), /* override def. ATA protocol */
+	PRB_CTRL_PACKET_READ	= (1 << 4), /* PACKET cmd read */
+	PRB_CTRL_PACKET_WRITE	= (1 << 5), /* PACKET cmd write */
+	PRB_CTRL_NIEN		= (1 << 6), /* Mask completion irq */
+	PRB_CTRL_SRST		= (1 << 7), /* Soft reset request (ign BSY?) */
+
+	/* PRB protocol field */
+	PRB_PROT_PACKET		= (1 << 0),
+	PRB_PROT_TCQ		= (1 << 1),
+	PRB_PROT_NCQ		= (1 << 2),
+	PRB_PROT_READ		= (1 << 3),
+	PRB_PROT_WRITE		= (1 << 4),
+	PRB_PROT_TRANSPARENT	= (1 << 5),
+
+	/*
+	 * Other constants
+	 */
+	SGE_TRM			= (1 << 31), /* Last SGE in chain */
+	SGE_LNK			= (1 << 30), /* linked list
+						Points to SGT, not SGE */
+	SGE_DRD			= (1 << 29), /* discard data read (/dev/null)
+						data address ignored */
+
+	SIL24_MAX_CMDS		= 31,
+
+	/* board id */
+	BID_SIL3124		= 0,
+	BID_SIL3132		= 1,
+	BID_SIL3131		= 2,
+
+	/* host flags */
+	SIL24_COMMON_FLAGS	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+				  ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
+				  ATA_FLAG_NCQ | ATA_FLAG_SKIP_D2H_BSY,
+	SIL24_FLAG_PCIX_IRQ_WOC	= (1 << 24), /* IRQ loss errata on PCI-X */
+
+	IRQ_STAT_4PORTS		= 0xf,
+};
+
+struct sil24_ata_block {
+	struct sil24_prb prb;
+	struct sil24_sge sge[LIBATA_MAX_PRD];
+};
+
+struct sil24_atapi_block {
+	struct sil24_prb prb;
+	u8 cdb[16];
+	struct sil24_sge sge[LIBATA_MAX_PRD - 1];
+};
+
+union sil24_cmd_block {
+	struct sil24_ata_block ata;
+	struct sil24_atapi_block atapi;
+};
+
+static struct sil24_cerr_info {
+	unsigned int err_mask, action;
+	const char *desc;
+} sil24_cerr_db[] = {
+	[0]			= { AC_ERR_DEV, ATA_EH_REVALIDATE,
+				    "device error" },
+	[PORT_CERR_DEV]		= { AC_ERR_DEV, ATA_EH_REVALIDATE,
+				    "device error via D2H FIS" },
+	[PORT_CERR_SDB]		= { AC_ERR_DEV, ATA_EH_REVALIDATE,
+				    "device error via SDB FIS" },
+	[PORT_CERR_DATA]	= { AC_ERR_ATA_BUS, ATA_EH_SOFTRESET,
+				    "error in data FIS" },
+	[PORT_CERR_SEND]	= { AC_ERR_ATA_BUS, ATA_EH_SOFTRESET,
+				    "failed to transmit command FIS" },
+	[PORT_CERR_INCONSISTENT] = { AC_ERR_HSM, ATA_EH_SOFTRESET,
+				     "protocol mismatch" },
+	[PORT_CERR_DIRECTION]	= { AC_ERR_HSM, ATA_EH_SOFTRESET,
+				    "data directon mismatch" },
+	[PORT_CERR_UNDERRUN]	= { AC_ERR_HSM, ATA_EH_SOFTRESET,
+				    "ran out of SGEs while writing" },
+	[PORT_CERR_OVERRUN]	= { AC_ERR_HSM, ATA_EH_SOFTRESET,
+				    "ran out of SGEs while reading" },
+	[PORT_CERR_PKT_PROT]	= { AC_ERR_HSM, ATA_EH_SOFTRESET,
+				    "invalid data directon for ATAPI CDB" },
+	[PORT_CERR_SGT_BOUNDARY] = { AC_ERR_SYSTEM, ATA_EH_SOFTRESET,
+				     "SGT no on qword boundary" },
+	[PORT_CERR_SGT_TGTABRT]	= { AC_ERR_HOST_BUS, ATA_EH_SOFTRESET,
+				    "PCI target abort while fetching SGT" },
+	[PORT_CERR_SGT_MSTABRT]	= { AC_ERR_HOST_BUS, ATA_EH_SOFTRESET,
+				    "PCI master abort while fetching SGT" },
+	[PORT_CERR_SGT_PCIPERR]	= { AC_ERR_HOST_BUS, ATA_EH_SOFTRESET,
+				    "PCI parity error while fetching SGT" },
+	[PORT_CERR_CMD_BOUNDARY] = { AC_ERR_SYSTEM, ATA_EH_SOFTRESET,
+				     "PRB not on qword boundary" },
+	[PORT_CERR_CMD_TGTABRT]	= { AC_ERR_HOST_BUS, ATA_EH_SOFTRESET,
+				    "PCI target abort while fetching PRB" },
+	[PORT_CERR_CMD_MSTABRT]	= { AC_ERR_HOST_BUS, ATA_EH_SOFTRESET,
+				    "PCI master abort while fetching PRB" },
+	[PORT_CERR_CMD_PCIPERR]	= { AC_ERR_HOST_BUS, ATA_EH_SOFTRESET,
+				    "PCI parity error while fetching PRB" },
+	[PORT_CERR_XFR_UNDEF]	= { AC_ERR_HOST_BUS, ATA_EH_SOFTRESET,
+				    "undefined error while transferring data" },
+	[PORT_CERR_XFR_TGTABRT]	= { AC_ERR_HOST_BUS, ATA_EH_SOFTRESET,
+				    "PCI target abort while transferring data" },
+	[PORT_CERR_XFR_MSTABRT]	= { AC_ERR_HOST_BUS, ATA_EH_SOFTRESET,
+				    "PCI master abort while transferring data" },
+	[PORT_CERR_XFR_PCIPERR]	= { AC_ERR_HOST_BUS, ATA_EH_SOFTRESET,
+				    "PCI parity error while transferring data" },
+	[PORT_CERR_SENDSERVICE]	= { AC_ERR_HSM, ATA_EH_SOFTRESET,
+				    "FIS received while sending service FIS" },
+};
+
+/*
+ * ap->private_data
+ *
+ * The preview driver always returned 0 for status.  We emulate it
+ * here from the previous interrupt.
+ */
+struct sil24_port_priv {
+	union sil24_cmd_block *cmd_block;	/* 32 cmd blocks */
+	dma_addr_t cmd_block_dma;		/* DMA base addr for them */
+	struct ata_taskfile tf;			/* Cached taskfile registers */
+};
+
+/* ap->host_set->private_data */
+struct sil24_host_priv {
+	void __iomem *host_base;	/* global controller control (128 bytes @BAR0) */
+	void __iomem *port_base;	/* port registers (4 * 8192 bytes @BAR2) */
+};
+
+static void sil24_dev_config(struct ata_port *ap, struct ata_device *dev);
+static u8 sil24_check_status(struct ata_port *ap);
+static u32 sil24_scr_read(struct ata_port *ap, unsigned sc_reg);
+static void sil24_scr_write(struct ata_port *ap, unsigned sc_reg, u32 val);
+static void sil24_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
+static void sil24_qc_prep(struct ata_queued_cmd *qc);
+static unsigned int sil24_qc_issue(struct ata_queued_cmd *qc);
+static void sil24_irq_clear(struct ata_port *ap);
+static irqreturn_t sil24_interrupt(int irq, void *dev_instance, struct pt_regs *regs);
+static void sil24_freeze(struct ata_port *ap);
+static void sil24_thaw(struct ata_port *ap);
+static void sil24_error_handler(struct ata_port *ap);
+static void sil24_post_internal_cmd(struct ata_queued_cmd *qc);
+static int sil24_port_start(struct ata_port *ap);
+static void sil24_port_stop(struct ata_port *ap);
+static void sil24_host_stop(struct ata_host_set *host_set);
+static int sil24_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
+static int sil24_pci_device_resume(struct pci_dev *pdev);
+
+static const struct pci_device_id sil24_pci_tbl[] = {
+	{ 0x1095, 0x3124, PCI_ANY_ID, PCI_ANY_ID, 0, 0, BID_SIL3124 },
+	{ 0x8086, 0x3124, PCI_ANY_ID, PCI_ANY_ID, 0, 0, BID_SIL3124 },
+	{ 0x1095, 0x3132, PCI_ANY_ID, PCI_ANY_ID, 0, 0, BID_SIL3132 },
+	{ 0x1095, 0x3131, PCI_ANY_ID, PCI_ANY_ID, 0, 0, BID_SIL3131 },
+	{ 0x1095, 0x3531, PCI_ANY_ID, PCI_ANY_ID, 0, 0, BID_SIL3131 },
+	{ } /* terminate list */
+};
+
+static struct pci_driver sil24_pci_driver = {
+	.name			= DRV_NAME,
+	.id_table		= sil24_pci_tbl,
+	.probe			= sil24_init_one,
+	.remove			= ata_pci_remove_one, /* safe? */
+	.suspend		= ata_pci_device_suspend,
+	.resume			= sil24_pci_device_resume,
+};
+
+static struct scsi_host_template sil24_sht = {
+	.module			= THIS_MODULE,
+	.name			= DRV_NAME,
+	.ioctl			= ata_scsi_ioctl,
+	.queuecommand		= ata_scsi_queuecmd,
+	.change_queue_depth	= ata_scsi_change_queue_depth,
+	.can_queue		= SIL24_MAX_CMDS,
+	.this_id		= ATA_SHT_THIS_ID,
+	.sg_tablesize		= LIBATA_MAX_PRD,
+	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
+	.emulated		= ATA_SHT_EMULATED,
+	.use_clustering		= ATA_SHT_USE_CLUSTERING,
+	.proc_name		= DRV_NAME,
+	.dma_boundary		= ATA_DMA_BOUNDARY,
+	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
+	.bios_param		= ata_std_bios_param,
+	.suspend		= ata_scsi_device_suspend,
+	.resume			= ata_scsi_device_resume,
+};
+
+static const struct ata_port_operations sil24_ops = {
+	.port_disable		= ata_port_disable,
+
+	.dev_config		= sil24_dev_config,
+
+	.check_status		= sil24_check_status,
+	.check_altstatus	= sil24_check_status,
+	.dev_select		= ata_noop_dev_select,
+
+	.tf_read		= sil24_tf_read,
+
+	.qc_prep		= sil24_qc_prep,
+	.qc_issue		= sil24_qc_issue,
+
+	.irq_handler		= sil24_interrupt,
+	.irq_clear		= sil24_irq_clear,
+
+	.scr_read		= sil24_scr_read,
+	.scr_write		= sil24_scr_write,
+
+	.freeze			= sil24_freeze,
+	.thaw			= sil24_thaw,
+	.error_handler		= sil24_error_handler,
+	.post_internal_cmd	= sil24_post_internal_cmd,
+
+	.port_start		= sil24_port_start,
+	.port_stop		= sil24_port_stop,
+	.host_stop		= sil24_host_stop,
+};
+
+/*
+ * Use bits 30-31 of host_flags to encode available port numbers.
+ * Current maxium is 4.
+ */
+#define SIL24_NPORTS2FLAG(nports)	((((unsigned)(nports) - 1) & 0x3) << 30)
+#define SIL24_FLAG2NPORTS(flag)		((((flag) >> 30) & 0x3) + 1)
+
+static struct ata_port_info sil24_port_info[] = {
+	/* sil_3124 */
+	{
+		.sht		= &sil24_sht,
+		.host_flags	= SIL24_COMMON_FLAGS | SIL24_NPORTS2FLAG(4) |
+				  SIL24_FLAG_PCIX_IRQ_WOC,
+		.pio_mask	= 0x1f,			/* pio0-4 */
+		.mwdma_mask	= 0x07,			/* mwdma0-2 */
+		.udma_mask	= 0x3f,			/* udma0-5 */
+		.port_ops	= &sil24_ops,
+	},
+	/* sil_3132 */
+	{
+		.sht		= &sil24_sht,
+		.host_flags	= SIL24_COMMON_FLAGS | SIL24_NPORTS2FLAG(2),
+		.pio_mask	= 0x1f,			/* pio0-4 */
+		.mwdma_mask	= 0x07,			/* mwdma0-2 */
+		.udma_mask	= 0x3f,			/* udma0-5 */
+		.port_ops	= &sil24_ops,
+	},
+	/* sil_3131/sil_3531 */
+	{
+		.sht		= &sil24_sht,
+		.host_flags	= SIL24_COMMON_FLAGS | SIL24_NPORTS2FLAG(1),
+		.pio_mask	= 0x1f,			/* pio0-4 */
+		.mwdma_mask	= 0x07,			/* mwdma0-2 */
+		.udma_mask	= 0x3f,			/* udma0-5 */
+		.port_ops	= &sil24_ops,
+	},
+};
+
+static int sil24_tag(int tag)
+{
+	if (unlikely(ata_tag_internal(tag)))
+		return 0;
+	return tag;
+}
+
+static void sil24_dev_config(struct ata_port *ap, struct ata_device *dev)
+{
+	void __iomem *port = (void __iomem *)ap->ioaddr.cmd_addr;
+
+	if (dev->cdb_len == 16)
+		writel(PORT_CS_CDB16, port + PORT_CTRL_STAT);
+	else
+		writel(PORT_CS_CDB16, port + PORT_CTRL_CLR);
+}
+
+static inline void sil24_update_tf(struct ata_port *ap)
+{
+	struct sil24_port_priv *pp = ap->private_data;
+	void __iomem *port = (void __iomem *)ap->ioaddr.cmd_addr;
+	struct sil24_prb __iomem *prb = port;
+	u8 fis[6 * 4];
+
+	memcpy_fromio(fis, prb->fis, 6 * 4);
+	ata_tf_from_fis(fis, &pp->tf);
+}
+
+static u8 sil24_check_status(struct ata_port *ap)
+{
+	struct sil24_port_priv *pp = ap->private_data;
+	return pp->tf.command;
+}
+
+static int sil24_scr_map[] = {
+	[SCR_CONTROL]	= 0,
+	[SCR_STATUS]	= 1,
+	[SCR_ERROR]	= 2,
+	[SCR_ACTIVE]	= 3,
+};
+
+static u32 sil24_scr_read(struct ata_port *ap, unsigned sc_reg)
+{
+	void __iomem *scr_addr = (void __iomem *)ap->ioaddr.scr_addr;
+	if (sc_reg < ARRAY_SIZE(sil24_scr_map)) {
+		void __iomem *addr;
+		addr = scr_addr + sil24_scr_map[sc_reg] * 4;
+		return readl(scr_addr + sil24_scr_map[sc_reg] * 4);
+	}
+	return 0xffffffffU;
+}
+
+static void sil24_scr_write(struct ata_port *ap, unsigned sc_reg, u32 val)
+{
+	void __iomem *scr_addr = (void __iomem *)ap->ioaddr.scr_addr;
+	if (sc_reg < ARRAY_SIZE(sil24_scr_map)) {
+		void __iomem *addr;
+		addr = scr_addr + sil24_scr_map[sc_reg] * 4;
+		writel(val, scr_addr + sil24_scr_map[sc_reg] * 4);
+	}
+}
+
+static void sil24_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
+{
+	struct sil24_port_priv *pp = ap->private_data;
+	*tf = pp->tf;
+}
+
+static int sil24_init_port(struct ata_port *ap)
+{
+	void __iomem *port = (void __iomem *)ap->ioaddr.cmd_addr;
+	u32 tmp;
+
+	writel(PORT_CS_INIT, port + PORT_CTRL_STAT);
+	ata_wait_register(port + PORT_CTRL_STAT,
+			  PORT_CS_INIT, PORT_CS_INIT, 10, 100);
+	tmp = ata_wait_register(port + PORT_CTRL_STAT,
+				PORT_CS_RDY, 0, 10, 100);
+
+	if ((tmp & (PORT_CS_INIT | PORT_CS_RDY)) != PORT_CS_RDY)
+		return -EIO;
+	return 0;
+}
+
+static int sil24_softreset(struct ata_port *ap, unsigned int *class)
+{
+	void __iomem *port = (void __iomem *)ap->ioaddr.cmd_addr;
+	struct sil24_port_priv *pp = ap->private_data;
+	struct sil24_prb *prb = &pp->cmd_block[0].ata.prb;
+	dma_addr_t paddr = pp->cmd_block_dma;
+	u32 mask, irq_stat;
+	const char *reason;
+
+	DPRINTK("ENTER\n");
+
+	if (ata_port_offline(ap)) {
+		DPRINTK("PHY reports no device\n");
+		*class = ATA_DEV_NONE;
+		goto out;
+	}
+
+	/* put the port into known state */
+	if (sil24_init_port(ap)) {
+		reason ="port not ready";
+		goto err;
+	}
+
+	/* do SRST */
+	prb->ctrl = cpu_to_le16(PRB_CTRL_SRST);
+	prb->fis[1] = 0; /* no PM yet */
+
+	writel((u32)paddr, port + PORT_CMD_ACTIVATE);
+	writel((u64)paddr >> 32, port + PORT_CMD_ACTIVATE + 4);
+
+	mask = (PORT_IRQ_COMPLETE | PORT_IRQ_ERROR) << PORT_IRQ_RAW_SHIFT;
+	irq_stat = ata_wait_register(port + PORT_IRQ_STAT, mask, 0x0,
+				     100, ATA_TMOUT_BOOT / HZ * 1000);
+
+	writel(irq_stat, port + PORT_IRQ_STAT); /* clear IRQs */
+	irq_stat >>= PORT_IRQ_RAW_SHIFT;
+
+	if (!(irq_stat & PORT_IRQ_COMPLETE)) {
+		if (irq_stat & PORT_IRQ_ERROR)
+			reason = "SRST command error";
+		else
+			reason = "timeout";
+		goto err;
+	}
+
+	sil24_update_tf(ap);
+	*class = ata_dev_classify(&pp->tf);
+
+	if (*class == ATA_DEV_UNKNOWN)
+		*class = ATA_DEV_NONE;
+
+ out:
+	DPRINTK("EXIT, class=%u\n", *class);
+	return 0;
+
+ err:
+	ata_port_printk(ap, KERN_ERR, "softreset failed (%s)\n", reason);
+	return -EIO;
+}
+
+static int sil24_hardreset(struct ata_port *ap, unsigned int *class)
+{
+	void __iomem *port = (void __iomem *)ap->ioaddr.cmd_addr;
+	const char *reason;
+	int tout_msec, rc;
+	u32 tmp;
+
+	/* sil24 does the right thing(tm) without any protection */
+	sata_set_spd(ap);
+
+	tout_msec = 100;
+	if (ata_port_online(ap))
+		tout_msec = 5000;
+
+	writel(PORT_CS_DEV_RST, port + PORT_CTRL_STAT);
+	tmp = ata_wait_register(port + PORT_CTRL_STAT,
+				PORT_CS_DEV_RST, PORT_CS_DEV_RST, 10, tout_msec);
+
+	/* SStatus oscillates between zero and valid status after
+	 * DEV_RST, debounce it.
+	 */
+	rc = sata_phy_debounce(ap, sata_deb_timing_long);
+	if (rc) {
+		reason = "PHY debouncing failed";
+		goto err;
+	}
+
+	if (tmp & PORT_CS_DEV_RST) {
+		if (ata_port_offline(ap))
+			return 0;
+		reason = "link not ready";
+		goto err;
+	}
+
+	/* Sil24 doesn't store signature FIS after hardreset, so we
+	 * can't wait for BSY to clear.  Some devices take a long time
+	 * to get ready and those devices will choke if we don't wait
+	 * for BSY clearance here.  Tell libata to perform follow-up
+	 * softreset.
+	 */
+	return -EAGAIN;
+
+ err:
+	ata_port_printk(ap, KERN_ERR, "hardreset failed (%s)\n", reason);
+	return -EIO;
+}
+
+static inline void sil24_fill_sg(struct ata_queued_cmd *qc,
+				 struct sil24_sge *sge)
+{
+	struct scatterlist *sg;
+	unsigned int idx = 0;
+
+	ata_for_each_sg(sg, qc) {
+		sge->addr = cpu_to_le64(sg_dma_address(sg));
+		sge->cnt = cpu_to_le32(sg_dma_len(sg));
+		if (ata_sg_is_last(sg, qc))
+			sge->flags = cpu_to_le32(SGE_TRM);
+		else
+			sge->flags = 0;
+
+		sge++;
+		idx++;
+	}
+}
+
+static void sil24_qc_prep(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct sil24_port_priv *pp = ap->private_data;
+	union sil24_cmd_block *cb;
+	struct sil24_prb *prb;
+	struct sil24_sge *sge;
+	u16 ctrl = 0;
+
+	cb = &pp->cmd_block[sil24_tag(qc->tag)];
+
+	switch (qc->tf.protocol) {
+	case ATA_PROT_PIO:
+	case ATA_PROT_DMA:
+	case ATA_PROT_NCQ:
+	case ATA_PROT_NODATA:
+		prb = &cb->ata.prb;
+		sge = cb->ata.sge;
+		break;
+
+	case ATA_PROT_ATAPI:
+	case ATA_PROT_ATAPI_DMA:
+	case ATA_PROT_ATAPI_NODATA:
+		prb = &cb->atapi.prb;
+		sge = cb->atapi.sge;
+		memset(cb->atapi.cdb, 0, 32);
+		memcpy(cb->atapi.cdb, qc->cdb, qc->dev->cdb_len);
+
+		if (qc->tf.protocol != ATA_PROT_ATAPI_NODATA) {
+			if (qc->tf.flags & ATA_TFLAG_WRITE)
+				ctrl = PRB_CTRL_PACKET_WRITE;
+			else
+				ctrl = PRB_CTRL_PACKET_READ;
+		}
+		break;
+
+	default:
+		prb = NULL;	/* shut up, gcc */
+		sge = NULL;
+		BUG();
+	}
+
+	prb->ctrl = cpu_to_le16(ctrl);
+	ata_tf_to_fis(&qc->tf, prb->fis, 0);
+
+	if (qc->flags & ATA_QCFLAG_DMAMAP)
+		sil24_fill_sg(qc, sge);
+}
+
+static unsigned int sil24_qc_issue(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct sil24_port_priv *pp = ap->private_data;
+	void __iomem *port = (void __iomem *)ap->ioaddr.cmd_addr;
+	unsigned int tag = sil24_tag(qc->tag);
+	dma_addr_t paddr;
+	void __iomem *activate;
+
+	paddr = pp->cmd_block_dma + tag * sizeof(*pp->cmd_block);
+	activate = port + PORT_CMD_ACTIVATE + tag * 8;
+
+	writel((u32)paddr, activate);
+	writel((u64)paddr >> 32, activate + 4);
+
+	return 0;
+}
+
+static void sil24_irq_clear(struct ata_port *ap)
+{
+	/* unused */
+}
+
+static void sil24_freeze(struct ata_port *ap)
+{
+	void __iomem *port = (void __iomem *)ap->ioaddr.cmd_addr;
+
+	/* Port-wide IRQ mask in HOST_CTRL doesn't really work, clear
+	 * PORT_IRQ_ENABLE instead.
+	 */
+	writel(0xffff, port + PORT_IRQ_ENABLE_CLR);
+}
+
+static void sil24_thaw(struct ata_port *ap)
+{
+	void __iomem *port = (void __iomem *)ap->ioaddr.cmd_addr;
+	u32 tmp;
+
+	/* clear IRQ */
+	tmp = readl(port + PORT_IRQ_STAT);
+	writel(tmp, port + PORT_IRQ_STAT);
+
+	/* turn IRQ back on */
+	writel(DEF_PORT_IRQ, port + PORT_IRQ_ENABLE_SET);
+}
+
+static void sil24_error_intr(struct ata_port *ap)
+{
+	void __iomem *port = (void __iomem *)ap->ioaddr.cmd_addr;
+	struct ata_eh_info *ehi = &ap->eh_info;
+	int freeze = 0;
+	u32 irq_stat;
+
+	/* on error, we need to clear IRQ explicitly */
+	irq_stat = readl(port + PORT_IRQ_STAT);
+	writel(irq_stat, port + PORT_IRQ_STAT);
+
+	/* first, analyze and record host port events */
+	ata_ehi_clear_desc(ehi);
+
+	ata_ehi_push_desc(ehi, "irq_stat 0x%08x", irq_stat);
+
+	if (irq_stat & (PORT_IRQ_PHYRDY_CHG | PORT_IRQ_DEV_XCHG)) {
+		ata_ehi_hotplugged(ehi);
+		ata_ehi_push_desc(ehi, ", %s",
+			       irq_stat & PORT_IRQ_PHYRDY_CHG ?
+			       "PHY RDY changed" : "device exchanged");
+		freeze = 1;
+	}
+
+	if (irq_stat & PORT_IRQ_UNK_FIS) {
+		ehi->err_mask |= AC_ERR_HSM;
+		ehi->action |= ATA_EH_SOFTRESET;
+		ata_ehi_push_desc(ehi , ", unknown FIS");
+		freeze = 1;
+	}
+
+	/* deal with command error */
+	if (irq_stat & PORT_IRQ_ERROR) {
+		struct sil24_cerr_info *ci = NULL;
+		unsigned int err_mask = 0, action = 0;
+		struct ata_queued_cmd *qc;
+		u32 cerr;
+
+		/* analyze CMD_ERR */
+		cerr = readl(port + PORT_CMD_ERR);
+		if (cerr < ARRAY_SIZE(sil24_cerr_db))
+			ci = &sil24_cerr_db[cerr];
+
+		if (ci && ci->desc) {
+			err_mask |= ci->err_mask;
+			action |= ci->action;
+			ata_ehi_push_desc(ehi, ", %s", ci->desc);
+		} else {
+			err_mask |= AC_ERR_OTHER;
+			action |= ATA_EH_SOFTRESET;
+			ata_ehi_push_desc(ehi, ", unknown command error %d",
+					  cerr);
+		}
+
+		/* record error info */
+		qc = ata_qc_from_tag(ap, ap->active_tag);
+		if (qc) {
+			sil24_update_tf(ap);
+			qc->err_mask |= err_mask;
+		} else
+			ehi->err_mask |= err_mask;
+
+		ehi->action |= action;
+	}
+
+	/* freeze or abort */
+	if (freeze)
+		ata_port_freeze(ap);
+	else
+		ata_port_abort(ap);
+}
+
+static void sil24_finish_qc(struct ata_queued_cmd *qc)
+{
+	if (qc->flags & ATA_QCFLAG_RESULT_TF)
+		sil24_update_tf(qc->ap);
+}
+
+static inline void sil24_host_intr(struct ata_port *ap)
+{
+	void __iomem *port = (void __iomem *)ap->ioaddr.cmd_addr;
+	u32 slot_stat, qc_active;
+	int rc;
+
+	slot_stat = readl(port + PORT_SLOT_STAT);
+
+	if (unlikely(slot_stat & HOST_SSTAT_ATTN)) {
+		sil24_error_intr(ap);
+		return;
+	}
+
+	if (ap->flags & SIL24_FLAG_PCIX_IRQ_WOC)
+		writel(PORT_IRQ_COMPLETE, port + PORT_IRQ_STAT);
+
+	qc_active = slot_stat & ~HOST_SSTAT_ATTN;
+	rc = ata_qc_complete_multiple(ap, qc_active, sil24_finish_qc);
+	if (rc > 0)
+		return;
+	if (rc < 0) {
+		struct ata_eh_info *ehi = &ap->eh_info;
+		ehi->err_mask |= AC_ERR_HSM;
+		ehi->action |= ATA_EH_SOFTRESET;
+		ata_port_freeze(ap);
+		return;
+	}
+
+	if (ata_ratelimit())
+		ata_port_printk(ap, KERN_INFO, "spurious interrupt "
+			"(slot_stat 0x%x active_tag %d sactive 0x%x)\n",
+			slot_stat, ap->active_tag, ap->sactive);
+}
+
+static irqreturn_t sil24_interrupt(int irq, void *dev_instance, struct pt_regs *regs)
+{
+	struct ata_host_set *host_set = dev_instance;
+	struct sil24_host_priv *hpriv = host_set->private_data;
+	unsigned handled = 0;
+	u32 status;
+	int i;
+
+	status = readl(hpriv->host_base + HOST_IRQ_STAT);
+
+	if (status == 0xffffffff) {
+		printk(KERN_ERR DRV_NAME ": IRQ status == 0xffffffff, "
+		       "PCI fault or device removal?\n");
+		goto out;
+	}
+
+	if (!(status & IRQ_STAT_4PORTS))
+		goto out;
+
+	spin_lock(&host_set->lock);
+
+	for (i = 0; i < host_set->n_ports; i++)
+		if (status & (1 << i)) {
+			struct ata_port *ap = host_set->ports[i];
+			if (ap && !(ap->flags & ATA_FLAG_DISABLED)) {
+				sil24_host_intr(host_set->ports[i]);
+				handled++;
+			} else
+				printk(KERN_ERR DRV_NAME
+				       ": interrupt from disabled port %d\n", i);
+		}
+
+	spin_unlock(&host_set->lock);
+ out:
+	return IRQ_RETVAL(handled);
+}
+
+static void sil24_error_handler(struct ata_port *ap)
+{
+	struct ata_eh_context *ehc = &ap->eh_context;
+
+	if (sil24_init_port(ap)) {
+		ata_eh_freeze_port(ap);
+		ehc->i.action |= ATA_EH_HARDRESET;
+	}
+
+	/* perform recovery */
+	ata_do_eh(ap, ata_std_prereset, sil24_softreset, sil24_hardreset,
+		  ata_std_postreset);
+}
+
+static void sil24_post_internal_cmd(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+
+	if (qc->flags & ATA_QCFLAG_FAILED)
+		qc->err_mask |= AC_ERR_OTHER;
+
+	/* make DMA engine forget about the failed command */
+	if (qc->err_mask)
+		sil24_init_port(ap);
+}
+
+static inline void sil24_cblk_free(struct sil24_port_priv *pp, struct device *dev)
+{
+	const size_t cb_size = sizeof(*pp->cmd_block) * SIL24_MAX_CMDS;
+
+	dma_free_coherent(dev, cb_size, pp->cmd_block, pp->cmd_block_dma);
+}
+
+static int sil24_port_start(struct ata_port *ap)
+{
+	struct device *dev = ap->host_set->dev;
+	struct sil24_port_priv *pp;
+	union sil24_cmd_block *cb;
+	size_t cb_size = sizeof(*cb) * SIL24_MAX_CMDS;
+	dma_addr_t cb_dma;
+	int rc = -ENOMEM;
+
+	pp = kzalloc(sizeof(*pp), GFP_KERNEL);
+	if (!pp)
+		goto err_out;
+
+	pp->tf.command = ATA_DRDY;
+
+	cb = dma_alloc_coherent(dev, cb_size, &cb_dma, GFP_KERNEL);
+	if (!cb)
+		goto err_out_pp;
+	memset(cb, 0, cb_size);
+
+	rc = ata_pad_alloc(ap, dev);
+	if (rc)
+		goto err_out_pad;
+
+	pp->cmd_block = cb;
+	pp->cmd_block_dma = cb_dma;
+
+	ap->private_data = pp;
+
+	return 0;
+
+err_out_pad:
+	sil24_cblk_free(pp, dev);
+err_out_pp:
+	kfree(pp);
+err_out:
+	return rc;
+}
+
+static void sil24_port_stop(struct ata_port *ap)
+{
+	struct device *dev = ap->host_set->dev;
+	struct sil24_port_priv *pp = ap->private_data;
+
+	sil24_cblk_free(pp, dev);
+	ata_pad_free(ap, dev);
+	kfree(pp);
+}
+
+static void sil24_host_stop(struct ata_host_set *host_set)
+{
+	struct sil24_host_priv *hpriv = host_set->private_data;
+	struct pci_dev *pdev = to_pci_dev(host_set->dev);
+
+	pci_iounmap(pdev, hpriv->host_base);
+	pci_iounmap(pdev, hpriv->port_base);
+	kfree(hpriv);
+}
+
+static void sil24_init_controller(struct pci_dev *pdev, int n_ports,
+				  unsigned long host_flags,
+				  void __iomem *host_base,
+				  void __iomem *port_base)
+{
+	u32 tmp;
+	int i;
+
+	/* GPIO off */
+	writel(0, host_base + HOST_FLASH_CMD);
+
+	/* clear global reset & mask interrupts during initialization */
+	writel(0, host_base + HOST_CTRL);
+
+	/* init ports */
+	for (i = 0; i < n_ports; i++) {
+		void __iomem *port = port_base + i * PORT_REGS_SIZE;
+
+		/* Initial PHY setting */
+		writel(0x20c, port + PORT_PHY_CFG);
+
+		/* Clear port RST */
+		tmp = readl(port + PORT_CTRL_STAT);
+		if (tmp & PORT_CS_PORT_RST) {
+			writel(PORT_CS_PORT_RST, port + PORT_CTRL_CLR);
+			tmp = ata_wait_register(port + PORT_CTRL_STAT,
+						PORT_CS_PORT_RST,
+						PORT_CS_PORT_RST, 10, 100);
+			if (tmp & PORT_CS_PORT_RST)
+				dev_printk(KERN_ERR, &pdev->dev,
+				           "failed to clear port RST\n");
+		}
+
+		/* Configure IRQ WoC */
+		if (host_flags & SIL24_FLAG_PCIX_IRQ_WOC)
+			writel(PORT_CS_IRQ_WOC, port + PORT_CTRL_STAT);
+		else
+			writel(PORT_CS_IRQ_WOC, port + PORT_CTRL_CLR);
+
+		/* Zero error counters. */
+		writel(0x8000, port + PORT_DECODE_ERR_THRESH);
+		writel(0x8000, port + PORT_CRC_ERR_THRESH);
+		writel(0x8000, port + PORT_HSHK_ERR_THRESH);
+		writel(0x0000, port + PORT_DECODE_ERR_CNT);
+		writel(0x0000, port + PORT_CRC_ERR_CNT);
+		writel(0x0000, port + PORT_HSHK_ERR_CNT);
+
+		/* Always use 64bit activation */
+		writel(PORT_CS_32BIT_ACTV, port + PORT_CTRL_CLR);
+
+		/* Clear port multiplier enable and resume bits */
+		writel(PORT_CS_PM_EN | PORT_CS_RESUME, port + PORT_CTRL_CLR);
+	}
+
+	/* Turn on interrupts */
+	writel(IRQ_STAT_4PORTS, host_base + HOST_CTRL);
+}
+
+static int sil24_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	static int printed_version = 0;
+	unsigned int board_id = (unsigned int)ent->driver_data;
+	struct ata_port_info *pinfo = &sil24_port_info[board_id];
+	struct ata_probe_ent *probe_ent = NULL;
+	struct sil24_host_priv *hpriv = NULL;
+	void __iomem *host_base = NULL;
+	void __iomem *port_base = NULL;
+	int i, rc;
+	u32 tmp;
+
+	if (!printed_version++)
+		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
+
+	rc = pci_enable_device(pdev);
+	if (rc)
+		return rc;
+
+	rc = pci_request_regions(pdev, DRV_NAME);
+	if (rc)
+		goto out_disable;
+
+	rc = -ENOMEM;
+	/* map mmio registers */
+	host_base = pci_iomap(pdev, 0, 0);
+	if (!host_base)
+		goto out_free;
+	port_base = pci_iomap(pdev, 2, 0);
+	if (!port_base)
+		goto out_free;
+
+	/* allocate & init probe_ent and hpriv */
+	probe_ent = kzalloc(sizeof(*probe_ent), GFP_KERNEL);
+	if (!probe_ent)
+		goto out_free;
+
+	hpriv = kzalloc(sizeof(*hpriv), GFP_KERNEL);
+	if (!hpriv)
+		goto out_free;
+
+	probe_ent->dev = pci_dev_to_dev(pdev);
+	INIT_LIST_HEAD(&probe_ent->node);
+
+	probe_ent->sht		= pinfo->sht;
+	probe_ent->host_flags	= pinfo->host_flags;
+	probe_ent->pio_mask	= pinfo->pio_mask;
+	probe_ent->mwdma_mask	= pinfo->mwdma_mask;
+	probe_ent->udma_mask	= pinfo->udma_mask;
+	probe_ent->port_ops	= pinfo->port_ops;
+	probe_ent->n_ports	= SIL24_FLAG2NPORTS(pinfo->host_flags);
+
+	probe_ent->irq = pdev->irq;
+	probe_ent->irq_flags = IRQF_SHARED;
+	probe_ent->private_data = hpriv;
+
+	hpriv->host_base = host_base;
+	hpriv->port_base = port_base;
+
+	/*
+	 * Configure the device
+	 */
+	if (!pci_set_dma_mask(pdev, DMA_64BIT_MASK)) {
+		rc = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK);
+		if (rc) {
+			rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
+			if (rc) {
+				dev_printk(KERN_ERR, &pdev->dev,
+					   "64-bit DMA enable failed\n");
+				goto out_free;
+			}
+		}
+	} else {
+		rc = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
+		if (rc) {
+			dev_printk(KERN_ERR, &pdev->dev,
+				   "32-bit DMA enable failed\n");
+			goto out_free;
+		}
+		rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
+		if (rc) {
+			dev_printk(KERN_ERR, &pdev->dev,
+				   "32-bit consistent DMA enable failed\n");
+			goto out_free;
+		}
+	}
+
+	/* Apply workaround for completion IRQ loss on PCI-X errata */
+	if (probe_ent->host_flags & SIL24_FLAG_PCIX_IRQ_WOC) {
+		tmp = readl(host_base + HOST_CTRL);
+		if (tmp & (HOST_CTRL_TRDY | HOST_CTRL_STOP | HOST_CTRL_DEVSEL))
+			dev_printk(KERN_INFO, &pdev->dev,
+				   "Applying completion IRQ loss on PCI-X "
+				   "errata fix\n");
+		else
+			probe_ent->host_flags &= ~SIL24_FLAG_PCIX_IRQ_WOC;
+	}
+
+	for (i = 0; i < probe_ent->n_ports; i++) {
+		unsigned long portu =
+			(unsigned long)port_base + i * PORT_REGS_SIZE;
+
+		probe_ent->port[i].cmd_addr = portu;
+		probe_ent->port[i].scr_addr = portu + PORT_SCONTROL;
+
+		ata_std_ports(&probe_ent->port[i]);
+	}
+
+	sil24_init_controller(pdev, probe_ent->n_ports, probe_ent->host_flags,
+			      host_base, port_base);
+
+	pci_set_master(pdev);
+
+	/* FIXME: check ata_device_add return value */
+	ata_device_add(probe_ent);
+
+	kfree(probe_ent);
+	return 0;
+
+ out_free:
+	if (host_base)
+		pci_iounmap(pdev, host_base);
+	if (port_base)
+		pci_iounmap(pdev, port_base);
+	kfree(probe_ent);
+	kfree(hpriv);
+	pci_release_regions(pdev);
+ out_disable:
+	pci_disable_device(pdev);
+	return rc;
+}
+
+static int sil24_pci_device_resume(struct pci_dev *pdev)
+{
+	struct ata_host_set *host_set = dev_get_drvdata(&pdev->dev);
+	struct sil24_host_priv *hpriv = host_set->private_data;
+
+	ata_pci_device_do_resume(pdev);
+
+	if (pdev->dev.power.power_state.event == PM_EVENT_SUSPEND)
+		writel(HOST_CTRL_GLOBAL_RST, hpriv->host_base + HOST_CTRL);
+
+	sil24_init_controller(pdev, host_set->n_ports,
+			      host_set->ports[0]->flags,
+			      hpriv->host_base, hpriv->port_base);
+
+	ata_host_set_resume(host_set);
+
+	return 0;
+}
+
+static int __init sil24_init(void)
+{
+	return pci_register_driver(&sil24_pci_driver);
+}
+
+static void __exit sil24_exit(void)
+{
+	pci_unregister_driver(&sil24_pci_driver);
+}
+
+MODULE_AUTHOR("Tejun Heo");
+MODULE_DESCRIPTION("Silicon Image 3124/3132 SATA low-level driver");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, sil24_pci_tbl);
+
+module_init(sil24_init);
+module_exit(sil24_exit);
diff --git a/drivers/ata/sata_sis.c b/drivers/ata/sata_sis.c
new file mode 100644
index 0000000..ac24f66
--- /dev/null
+++ b/drivers/ata/sata_sis.c
@@ -0,0 +1,347 @@
+/*
+ *  sata_sis.c - Silicon Integrated Systems SATA
+ *
+ *  Maintained by:  Uwe Koziolek
+ *  		    Please ALWAYS copy linux-ide@vger.kernel.org
+ *		    on emails.
+ *
+ *  Copyright 2004 Uwe Koziolek
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ *  libata documentation is available via 'make {ps|pdf}docs',
+ *  as Documentation/DocBook/libata.*
+ *
+ *  Hardware documentation available under NDA.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+
+#define DRV_NAME	"sata_sis"
+#define DRV_VERSION	"0.6"
+
+enum {
+	sis_180			= 0,
+	SIS_SCR_PCI_BAR		= 5,
+
+	/* PCI configuration registers */
+	SIS_GENCTL		= 0x54, /* IDE General Control register */
+	SIS_SCR_BASE		= 0xc0, /* sata0 phy SCR registers */
+	SIS180_SATA1_OFS	= 0x10, /* offset from sata0->sata1 phy regs */
+	SIS182_SATA1_OFS	= 0x20, /* offset from sata0->sata1 phy regs */
+	SIS_PMR			= 0x90, /* port mapping register */
+	SIS_PMR_COMBINED	= 0x30,
+
+	/* random bits */
+	SIS_FLAG_CFGSCR		= (1 << 30), /* host flag: SCRs via PCI cfg */
+
+	GENCTL_IOMAPPED_SCR	= (1 << 26), /* if set, SCRs are in IO space */
+};
+
+static int sis_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
+static u32 sis_scr_read (struct ata_port *ap, unsigned int sc_reg);
+static void sis_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val);
+
+static const struct pci_device_id sis_pci_tbl[] = {
+	{ PCI_VENDOR_ID_SI, 0x180, PCI_ANY_ID, PCI_ANY_ID, 0, 0, sis_180 },
+	{ PCI_VENDOR_ID_SI, 0x181, PCI_ANY_ID, PCI_ANY_ID, 0, 0, sis_180 },
+	{ PCI_VENDOR_ID_SI, 0x182, PCI_ANY_ID, PCI_ANY_ID, 0, 0, sis_180 },
+	{ }	/* terminate list */
+};
+
+
+static struct pci_driver sis_pci_driver = {
+	.name			= DRV_NAME,
+	.id_table		= sis_pci_tbl,
+	.probe			= sis_init_one,
+	.remove			= ata_pci_remove_one,
+};
+
+static struct scsi_host_template sis_sht = {
+	.module			= THIS_MODULE,
+	.name			= DRV_NAME,
+	.ioctl			= ata_scsi_ioctl,
+	.queuecommand		= ata_scsi_queuecmd,
+	.can_queue		= ATA_DEF_QUEUE,
+	.this_id		= ATA_SHT_THIS_ID,
+	.sg_tablesize		= ATA_MAX_PRD,
+	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
+	.emulated		= ATA_SHT_EMULATED,
+	.use_clustering		= ATA_SHT_USE_CLUSTERING,
+	.proc_name		= DRV_NAME,
+	.dma_boundary		= ATA_DMA_BOUNDARY,
+	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
+	.bios_param		= ata_std_bios_param,
+};
+
+static const struct ata_port_operations sis_ops = {
+	.port_disable		= ata_port_disable,
+	.tf_load		= ata_tf_load,
+	.tf_read		= ata_tf_read,
+	.check_status		= ata_check_status,
+	.exec_command		= ata_exec_command,
+	.dev_select		= ata_std_dev_select,
+	.bmdma_setup            = ata_bmdma_setup,
+	.bmdma_start            = ata_bmdma_start,
+	.bmdma_stop		= ata_bmdma_stop,
+	.bmdma_status		= ata_bmdma_status,
+	.qc_prep		= ata_qc_prep,
+	.qc_issue		= ata_qc_issue_prot,
+	.data_xfer		= ata_pio_data_xfer,
+	.freeze			= ata_bmdma_freeze,
+	.thaw			= ata_bmdma_thaw,
+	.error_handler		= ata_bmdma_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
+	.irq_handler		= ata_interrupt,
+	.irq_clear		= ata_bmdma_irq_clear,
+	.scr_read		= sis_scr_read,
+	.scr_write		= sis_scr_write,
+	.port_start		= ata_port_start,
+	.port_stop		= ata_port_stop,
+	.host_stop		= ata_host_stop,
+};
+
+static struct ata_port_info sis_port_info = {
+	.sht		= &sis_sht,
+	.host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY,
+	.pio_mask	= 0x1f,
+	.mwdma_mask	= 0x7,
+	.udma_mask	= 0x7f,
+	.port_ops	= &sis_ops,
+};
+
+
+MODULE_AUTHOR("Uwe Koziolek");
+MODULE_DESCRIPTION("low-level driver for Silicon Integratad Systems SATA controller");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, sis_pci_tbl);
+MODULE_VERSION(DRV_VERSION);
+
+static unsigned int get_scr_cfg_addr(unsigned int port_no, unsigned int sc_reg, int device)
+{
+	unsigned int addr = SIS_SCR_BASE + (4 * sc_reg);
+
+	if (port_no)  {
+		if (device == 0x182)
+			addr += SIS182_SATA1_OFS;
+		else
+			addr += SIS180_SATA1_OFS;
+	}
+
+	return addr;
+}
+
+static u32 sis_scr_cfg_read (struct ata_port *ap, unsigned int sc_reg)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host_set->dev);
+	unsigned int cfg_addr = get_scr_cfg_addr(ap->port_no, sc_reg, pdev->device);
+	u32 val, val2 = 0;
+	u8 pmr;
+
+	if (sc_reg == SCR_ERROR) /* doesn't exist in PCI cfg space */
+		return 0xffffffff;
+
+	pci_read_config_byte(pdev, SIS_PMR, &pmr);
+
+	pci_read_config_dword(pdev, cfg_addr, &val);
+
+	if ((pdev->device == 0x182) || (pmr & SIS_PMR_COMBINED))
+		pci_read_config_dword(pdev, cfg_addr+0x10, &val2);
+
+	return val|val2;
+}
+
+static void sis_scr_cfg_write (struct ata_port *ap, unsigned int scr, u32 val)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host_set->dev);
+	unsigned int cfg_addr = get_scr_cfg_addr(ap->port_no, scr, pdev->device);
+	u8 pmr;
+
+	if (scr == SCR_ERROR) /* doesn't exist in PCI cfg space */
+		return;
+
+	pci_read_config_byte(pdev, SIS_PMR, &pmr);
+
+	pci_write_config_dword(pdev, cfg_addr, val);
+
+	if ((pdev->device == 0x182) || (pmr & SIS_PMR_COMBINED))
+		pci_write_config_dword(pdev, cfg_addr+0x10, val);
+}
+
+static u32 sis_scr_read (struct ata_port *ap, unsigned int sc_reg)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host_set->dev);
+	u32 val, val2 = 0;
+	u8 pmr;
+
+	if (sc_reg > SCR_CONTROL)
+		return 0xffffffffU;
+
+	if (ap->flags & SIS_FLAG_CFGSCR)
+		return sis_scr_cfg_read(ap, sc_reg);
+
+	pci_read_config_byte(pdev, SIS_PMR, &pmr);
+
+	val = inl(ap->ioaddr.scr_addr + (sc_reg * 4));
+
+	if ((pdev->device == 0x182) || (pmr & SIS_PMR_COMBINED))
+		val2 = inl(ap->ioaddr.scr_addr + (sc_reg * 4) + 0x10);
+
+	return val | val2;
+}
+
+static void sis_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host_set->dev);
+	u8 pmr;
+
+	if (sc_reg > SCR_CONTROL)
+		return;
+
+	pci_read_config_byte(pdev, SIS_PMR, &pmr);
+
+	if (ap->flags & SIS_FLAG_CFGSCR)
+		sis_scr_cfg_write(ap, sc_reg, val);
+	else {
+		outl(val, ap->ioaddr.scr_addr + (sc_reg * 4));
+		if ((pdev->device == 0x182) || (pmr & SIS_PMR_COMBINED))
+			outl(val, ap->ioaddr.scr_addr + (sc_reg * 4)+0x10);
+	}
+}
+
+static int sis_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	static int printed_version;
+	struct ata_probe_ent *probe_ent = NULL;
+	int rc;
+	u32 genctl;
+	struct ata_port_info *ppi;
+	int pci_dev_busy = 0;
+	u8 pmr;
+	u8 port2_start;
+
+	if (!printed_version++)
+		dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
+
+	rc = pci_enable_device(pdev);
+	if (rc)
+		return rc;
+
+	rc = pci_request_regions(pdev, DRV_NAME);
+	if (rc) {
+		pci_dev_busy = 1;
+		goto err_out;
+	}
+
+	rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
+	if (rc)
+		goto err_out_regions;
+	rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
+	if (rc)
+		goto err_out_regions;
+
+	ppi = &sis_port_info;
+	probe_ent = ata_pci_init_native_mode(pdev, &ppi, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
+	if (!probe_ent) {
+		rc = -ENOMEM;
+		goto err_out_regions;
+	}
+
+	/* check and see if the SCRs are in IO space or PCI cfg space */
+	pci_read_config_dword(pdev, SIS_GENCTL, &genctl);
+	if ((genctl & GENCTL_IOMAPPED_SCR) == 0)
+		probe_ent->host_flags |= SIS_FLAG_CFGSCR;
+
+	/* if hardware thinks SCRs are in IO space, but there are
+	 * no IO resources assigned, change to PCI cfg space.
+	 */
+	if ((!(probe_ent->host_flags & SIS_FLAG_CFGSCR)) &&
+	    ((pci_resource_start(pdev, SIS_SCR_PCI_BAR) == 0) ||
+	     (pci_resource_len(pdev, SIS_SCR_PCI_BAR) < 128))) {
+		genctl &= ~GENCTL_IOMAPPED_SCR;
+		pci_write_config_dword(pdev, SIS_GENCTL, genctl);
+		probe_ent->host_flags |= SIS_FLAG_CFGSCR;
+	}
+
+	pci_read_config_byte(pdev, SIS_PMR, &pmr);
+	if (ent->device != 0x182) {
+		if ((pmr & SIS_PMR_COMBINED) == 0) {
+			dev_printk(KERN_INFO, &pdev->dev,
+				   "Detected SiS 180/181 chipset in SATA mode\n");
+			port2_start = 64;
+		}
+		else {
+			dev_printk(KERN_INFO, &pdev->dev,
+				   "Detected SiS 180/181 chipset in combined mode\n");
+			port2_start=0;
+		}
+	}
+	else {
+		dev_printk(KERN_INFO, &pdev->dev, "Detected SiS 182 chipset\n");
+		port2_start = 0x20;
+	}
+
+	if (!(probe_ent->host_flags & SIS_FLAG_CFGSCR)) {
+		probe_ent->port[0].scr_addr =
+			pci_resource_start(pdev, SIS_SCR_PCI_BAR);
+		probe_ent->port[1].scr_addr =
+			pci_resource_start(pdev, SIS_SCR_PCI_BAR) + port2_start;
+	}
+
+	pci_set_master(pdev);
+	pci_intx(pdev, 1);
+
+	/* FIXME: check ata_device_add return value */
+	ata_device_add(probe_ent);
+	kfree(probe_ent);
+
+	return 0;
+
+err_out_regions:
+	pci_release_regions(pdev);
+
+err_out:
+	if (!pci_dev_busy)
+		pci_disable_device(pdev);
+	return rc;
+
+}
+
+static int __init sis_init(void)
+{
+	return pci_register_driver(&sis_pci_driver);
+}
+
+static void __exit sis_exit(void)
+{
+	pci_unregister_driver(&sis_pci_driver);
+}
+
+module_init(sis_init);
+module_exit(sis_exit);
+
diff --git a/drivers/ata/sata_svw.c b/drivers/ata/sata_svw.c
new file mode 100644
index 0000000..baf259a
--- /dev/null
+++ b/drivers/ata/sata_svw.c
@@ -0,0 +1,508 @@
+/*
+ *  sata_svw.c - ServerWorks / Apple K2 SATA
+ *
+ *  Maintained by: Benjamin Herrenschmidt <benh@kernel.crashing.org> and
+ *		   Jeff Garzik <jgarzik@pobox.com>
+ *  		    Please ALWAYS copy linux-ide@vger.kernel.org
+ *		    on emails.
+ *
+ *  Copyright 2003 Benjamin Herrenschmidt <benh@kernel.crashing.org>
+ *
+ *  Bits from Jeff Garzik, Copyright RedHat, Inc.
+ *
+ *  This driver probably works with non-Apple versions of the
+ *  Broadcom chipset...
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ *  libata documentation is available via 'make {ps|pdf}docs',
+ *  as Documentation/DocBook/libata.*
+ *
+ *  Hardware documentation available under NDA.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+
+#ifdef CONFIG_PPC_OF
+#include <asm/prom.h>
+#include <asm/pci-bridge.h>
+#endif /* CONFIG_PPC_OF */
+
+#define DRV_NAME	"sata_svw"
+#define DRV_VERSION	"2.0"
+
+enum {
+	/* Taskfile registers offsets */
+	K2_SATA_TF_CMD_OFFSET		= 0x00,
+	K2_SATA_TF_DATA_OFFSET		= 0x00,
+	K2_SATA_TF_ERROR_OFFSET		= 0x04,
+	K2_SATA_TF_NSECT_OFFSET		= 0x08,
+	K2_SATA_TF_LBAL_OFFSET		= 0x0c,
+	K2_SATA_TF_LBAM_OFFSET		= 0x10,
+	K2_SATA_TF_LBAH_OFFSET		= 0x14,
+	K2_SATA_TF_DEVICE_OFFSET	= 0x18,
+	K2_SATA_TF_CMDSTAT_OFFSET      	= 0x1c,
+	K2_SATA_TF_CTL_OFFSET		= 0x20,
+
+	/* DMA base */
+	K2_SATA_DMA_CMD_OFFSET		= 0x30,
+
+	/* SCRs base */
+	K2_SATA_SCR_STATUS_OFFSET	= 0x40,
+	K2_SATA_SCR_ERROR_OFFSET	= 0x44,
+	K2_SATA_SCR_CONTROL_OFFSET	= 0x48,
+
+	/* Others */
+	K2_SATA_SICR1_OFFSET		= 0x80,
+	K2_SATA_SICR2_OFFSET		= 0x84,
+	K2_SATA_SIM_OFFSET		= 0x88,
+
+	/* Port stride */
+	K2_SATA_PORT_OFFSET		= 0x100,
+};
+
+static u8 k2_stat_check_status(struct ata_port *ap);
+
+
+static u32 k2_sata_scr_read (struct ata_port *ap, unsigned int sc_reg)
+{
+	if (sc_reg > SCR_CONTROL)
+		return 0xffffffffU;
+	return readl((void *) ap->ioaddr.scr_addr + (sc_reg * 4));
+}
+
+
+static void k2_sata_scr_write (struct ata_port *ap, unsigned int sc_reg,
+			       u32 val)
+{
+	if (sc_reg > SCR_CONTROL)
+		return;
+	writel(val, (void *) ap->ioaddr.scr_addr + (sc_reg * 4));
+}
+
+
+static void k2_sata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
+{
+	struct ata_ioports *ioaddr = &ap->ioaddr;
+	unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
+
+	if (tf->ctl != ap->last_ctl) {
+		writeb(tf->ctl, ioaddr->ctl_addr);
+		ap->last_ctl = tf->ctl;
+		ata_wait_idle(ap);
+	}
+	if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
+		writew(tf->feature | (((u16)tf->hob_feature) << 8), ioaddr->feature_addr);
+		writew(tf->nsect | (((u16)tf->hob_nsect) << 8), ioaddr->nsect_addr);
+		writew(tf->lbal | (((u16)tf->hob_lbal) << 8), ioaddr->lbal_addr);
+		writew(tf->lbam | (((u16)tf->hob_lbam) << 8), ioaddr->lbam_addr);
+		writew(tf->lbah | (((u16)tf->hob_lbah) << 8), ioaddr->lbah_addr);
+	} else if (is_addr) {
+		writew(tf->feature, ioaddr->feature_addr);
+		writew(tf->nsect, ioaddr->nsect_addr);
+		writew(tf->lbal, ioaddr->lbal_addr);
+		writew(tf->lbam, ioaddr->lbam_addr);
+		writew(tf->lbah, ioaddr->lbah_addr);
+	}
+
+	if (tf->flags & ATA_TFLAG_DEVICE)
+		writeb(tf->device, ioaddr->device_addr);
+
+	ata_wait_idle(ap);
+}
+
+
+static void k2_sata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
+{
+	struct ata_ioports *ioaddr = &ap->ioaddr;
+	u16 nsect, lbal, lbam, lbah, feature;
+
+	tf->command = k2_stat_check_status(ap);
+	tf->device = readw(ioaddr->device_addr);
+	feature = readw(ioaddr->error_addr);
+	nsect = readw(ioaddr->nsect_addr);
+	lbal = readw(ioaddr->lbal_addr);
+	lbam = readw(ioaddr->lbam_addr);
+	lbah = readw(ioaddr->lbah_addr);
+
+	tf->feature = feature;
+	tf->nsect = nsect;
+	tf->lbal = lbal;
+	tf->lbam = lbam;
+	tf->lbah = lbah;
+
+	if (tf->flags & ATA_TFLAG_LBA48) {
+		tf->hob_feature = feature >> 8;
+		tf->hob_nsect = nsect >> 8;
+		tf->hob_lbal = lbal >> 8;
+		tf->hob_lbam = lbam >> 8;
+		tf->hob_lbah = lbah >> 8;
+        }
+}
+
+/**
+ *	k2_bmdma_setup_mmio - Set up PCI IDE BMDMA transaction (MMIO)
+ *	@qc: Info associated with this ATA transaction.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+static void k2_bmdma_setup_mmio (struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
+	u8 dmactl;
+	void *mmio = (void *) ap->ioaddr.bmdma_addr;
+	/* load PRD table addr. */
+	mb();	/* make sure PRD table writes are visible to controller */
+	writel(ap->prd_dma, mmio + ATA_DMA_TABLE_OFS);
+
+	/* specify data direction, triple-check start bit is clear */
+	dmactl = readb(mmio + ATA_DMA_CMD);
+	dmactl &= ~(ATA_DMA_WR | ATA_DMA_START);
+	if (!rw)
+		dmactl |= ATA_DMA_WR;
+	writeb(dmactl, mmio + ATA_DMA_CMD);
+
+	/* issue r/w command if this is not a ATA DMA command*/
+	if (qc->tf.protocol != ATA_PROT_DMA)
+		ap->ops->exec_command(ap, &qc->tf);
+}
+
+/**
+ *	k2_bmdma_start_mmio - Start a PCI IDE BMDMA transaction (MMIO)
+ *	@qc: Info associated with this ATA transaction.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host_set lock)
+ */
+
+static void k2_bmdma_start_mmio (struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	void *mmio = (void *) ap->ioaddr.bmdma_addr;
+	u8 dmactl;
+
+	/* start host DMA transaction */
+	dmactl = readb(mmio + ATA_DMA_CMD);
+	writeb(dmactl | ATA_DMA_START, mmio + ATA_DMA_CMD);
+	/* There is a race condition in certain SATA controllers that can
+	   be seen when the r/w command is given to the controller before the
+	   host DMA is started. On a Read command, the controller would initiate
+	   the command to the drive even before it sees the DMA start. When there
+	   are very fast drives connected to the controller, or when the data request
+	   hits in the drive cache, there is the possibility that the drive returns a part
+	   or all of the requested data to the controller before the DMA start is issued.
+	   In this case, the controller would become confused as to what to do with the data.
+	   In the worst case when all the data is returned back to the controller, the
+	   controller could hang. In other cases it could return partial data returning
+	   in data corruption. This problem has been seen in PPC systems and can also appear
+	   on an system with very fast disks, where the SATA controller is sitting behind a
+	   number of bridges, and hence there is significant latency between the r/w command
+	   and the start command. */
+	/* issue r/w command if the access is to ATA*/
+	if (qc->tf.protocol == ATA_PROT_DMA)
+		ap->ops->exec_command(ap, &qc->tf);
+}
+
+
+static u8 k2_stat_check_status(struct ata_port *ap)
+{
+       	return readl((void *) ap->ioaddr.status_addr);
+}
+
+#ifdef CONFIG_PPC_OF
+/*
+ * k2_sata_proc_info
+ * inout : decides on the direction of the dataflow and the meaning of the
+ *	   variables
+ * buffer: If inout==FALSE data is being written to it else read from it
+ * *start: If inout==FALSE start of the valid data in the buffer
+ * offset: If inout==FALSE offset from the beginning of the imaginary file
+ *	   from which we start writing into the buffer
+ * length: If inout==FALSE max number of bytes to be written into the buffer
+ *	   else number of bytes in the buffer
+ */
+static int k2_sata_proc_info(struct Scsi_Host *shost, char *page, char **start,
+			     off_t offset, int count, int inout)
+{
+	struct ata_port *ap;
+	struct device_node *np;
+	int len, index;
+
+	/* Find  the ata_port */
+	ap = ata_shost_to_port(shost);
+	if (ap == NULL)
+		return 0;
+
+	/* Find the OF node for the PCI device proper */
+	np = pci_device_to_OF_node(to_pci_dev(ap->host_set->dev));
+	if (np == NULL)
+		return 0;
+
+	/* Match it to a port node */
+	index = (ap == ap->host_set->ports[0]) ? 0 : 1;
+	for (np = np->child; np != NULL; np = np->sibling) {
+		u32 *reg = (u32 *)get_property(np, "reg", NULL);
+		if (!reg)
+			continue;
+		if (index == *reg)
+			break;
+	}
+	if (np == NULL)
+		return 0;
+
+	len = sprintf(page, "devspec: %s\n", np->full_name);
+
+	return len;
+}
+#endif /* CONFIG_PPC_OF */
+
+
+static struct scsi_host_template k2_sata_sht = {
+	.module			= THIS_MODULE,
+	.name			= DRV_NAME,
+	.ioctl			= ata_scsi_ioctl,
+	.queuecommand		= ata_scsi_queuecmd,
+	.can_queue		= ATA_DEF_QUEUE,
+	.this_id		= ATA_SHT_THIS_ID,
+	.sg_tablesize		= LIBATA_MAX_PRD,
+	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
+	.emulated		= ATA_SHT_EMULATED,
+	.use_clustering		= ATA_SHT_USE_CLUSTERING,
+	.proc_name		= DRV_NAME,
+	.dma_boundary		= ATA_DMA_BOUNDARY,
+	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
+#ifdef CONFIG_PPC_OF
+	.proc_info		= k2_sata_proc_info,
+#endif
+	.bios_param		= ata_std_bios_param,
+};
+
+
+static const struct ata_port_operations k2_sata_ops = {
+	.port_disable		= ata_port_disable,
+	.tf_load		= k2_sata_tf_load,
+	.tf_read		= k2_sata_tf_read,
+	.check_status		= k2_stat_check_status,
+	.exec_command		= ata_exec_command,
+	.dev_select		= ata_std_dev_select,
+	.bmdma_setup		= k2_bmdma_setup_mmio,
+	.bmdma_start		= k2_bmdma_start_mmio,
+	.bmdma_stop		= ata_bmdma_stop,
+	.bmdma_status		= ata_bmdma_status,
+	.qc_prep		= ata_qc_prep,
+	.qc_issue		= ata_qc_issue_prot,
+	.data_xfer		= ata_mmio_data_xfer,
+	.freeze			= ata_bmdma_freeze,
+	.thaw			= ata_bmdma_thaw,
+	.error_handler		= ata_bmdma_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
+	.irq_handler		= ata_interrupt,
+	.irq_clear		= ata_bmdma_irq_clear,
+	.scr_read		= k2_sata_scr_read,
+	.scr_write		= k2_sata_scr_write,
+	.port_start		= ata_port_start,
+	.port_stop		= ata_port_stop,
+	.host_stop		= ata_pci_host_stop,
+};
+
+static void k2_sata_setup_port(struct ata_ioports *port, unsigned long base)
+{
+	port->cmd_addr		= base + K2_SATA_TF_CMD_OFFSET;
+	port->data_addr		= base + K2_SATA_TF_DATA_OFFSET;
+	port->feature_addr	=
+	port->error_addr	= base + K2_SATA_TF_ERROR_OFFSET;
+	port->nsect_addr	= base + K2_SATA_TF_NSECT_OFFSET;
+	port->lbal_addr		= base + K2_SATA_TF_LBAL_OFFSET;
+	port->lbam_addr		= base + K2_SATA_TF_LBAM_OFFSET;
+	port->lbah_addr		= base + K2_SATA_TF_LBAH_OFFSET;
+	port->device_addr	= base + K2_SATA_TF_DEVICE_OFFSET;
+	port->command_addr	=
+	port->status_addr	= base + K2_SATA_TF_CMDSTAT_OFFSET;
+	port->altstatus_addr	=
+	port->ctl_addr		= base + K2_SATA_TF_CTL_OFFSET;
+	port->bmdma_addr	= base + K2_SATA_DMA_CMD_OFFSET;
+	port->scr_addr		= base + K2_SATA_SCR_STATUS_OFFSET;
+}
+
+
+static int k2_sata_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	static int printed_version;
+	struct ata_probe_ent *probe_ent = NULL;
+	unsigned long base;
+	void __iomem *mmio_base;
+	int pci_dev_busy = 0;
+	int rc;
+	int i;
+
+	if (!printed_version++)
+		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
+
+	/*
+	 * If this driver happens to only be useful on Apple's K2, then
+	 * we should check that here as it has a normal Serverworks ID
+	 */
+	rc = pci_enable_device(pdev);
+	if (rc)
+		return rc;
+	/*
+	 * Check if we have resources mapped at all (second function may
+	 * have been disabled by firmware)
+	 */
+	if (pci_resource_len(pdev, 5) == 0)
+		return -ENODEV;
+
+	/* Request PCI regions */
+	rc = pci_request_regions(pdev, DRV_NAME);
+	if (rc) {
+		pci_dev_busy = 1;
+		goto err_out;
+	}
+
+	rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
+	if (rc)
+		goto err_out_regions;
+	rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
+	if (rc)
+		goto err_out_regions;
+
+	probe_ent = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
+	if (probe_ent == NULL) {
+		rc = -ENOMEM;
+		goto err_out_regions;
+	}
+
+	memset(probe_ent, 0, sizeof(*probe_ent));
+	probe_ent->dev = pci_dev_to_dev(pdev);
+	INIT_LIST_HEAD(&probe_ent->node);
+
+	mmio_base = pci_iomap(pdev, 5, 0);
+	if (mmio_base == NULL) {
+		rc = -ENOMEM;
+		goto err_out_free_ent;
+	}
+	base = (unsigned long) mmio_base;
+
+	/* Clear a magic bit in SCR1 according to Darwin, those help
+	 * some funky seagate drives (though so far, those were already
+	 * set by the firmware on the machines I had access to)
+	 */
+	writel(readl(mmio_base + K2_SATA_SICR1_OFFSET) & ~0x00040000,
+	       mmio_base + K2_SATA_SICR1_OFFSET);
+
+	/* Clear SATA error & interrupts we don't use */
+	writel(0xffffffff, mmio_base + K2_SATA_SCR_ERROR_OFFSET);
+	writel(0x0, mmio_base + K2_SATA_SIM_OFFSET);
+
+	probe_ent->sht = &k2_sata_sht;
+	probe_ent->host_flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+				ATA_FLAG_MMIO;
+	probe_ent->port_ops = &k2_sata_ops;
+	probe_ent->n_ports = 4;
+	probe_ent->irq = pdev->irq;
+	probe_ent->irq_flags = IRQF_SHARED;
+	probe_ent->mmio_base = mmio_base;
+
+	/* We don't care much about the PIO/UDMA masks, but the core won't like us
+	 * if we don't fill these
+	 */
+	probe_ent->pio_mask = 0x1f;
+	probe_ent->mwdma_mask = 0x7;
+	probe_ent->udma_mask = 0x7f;
+
+	/* different controllers have different number of ports - currently 4 or 8 */
+	/* All ports are on the same function. Multi-function device is no
+	 * longer available. This should not be seen in any system. */
+	for (i = 0; i < ent->driver_data; i++)
+		k2_sata_setup_port(&probe_ent->port[i], base + i * K2_SATA_PORT_OFFSET);
+
+	pci_set_master(pdev);
+
+	/* FIXME: check ata_device_add return value */
+	ata_device_add(probe_ent);
+	kfree(probe_ent);
+
+	return 0;
+
+err_out_free_ent:
+	kfree(probe_ent);
+err_out_regions:
+	pci_release_regions(pdev);
+err_out:
+	if (!pci_dev_busy)
+		pci_disable_device(pdev);
+	return rc;
+}
+
+/* 0x240 is device ID for Apple K2 device
+ * 0x241 is device ID for Serverworks Frodo4
+ * 0x242 is device ID for Serverworks Frodo8
+ * 0x24a is device ID for BCM5785 (aka HT1000) HT southbridge integrated SATA
+ * controller
+ * */
+static const struct pci_device_id k2_sata_pci_tbl[] = {
+	{ 0x1166, 0x0240, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 4 },
+	{ 0x1166, 0x0241, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 4 },
+	{ 0x1166, 0x0242, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 8 },
+	{ 0x1166, 0x024a, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 4 },
+	{ 0x1166, 0x024b, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 4 },
+	{ }
+};
+
+
+static struct pci_driver k2_sata_pci_driver = {
+	.name			= DRV_NAME,
+	.id_table		= k2_sata_pci_tbl,
+	.probe			= k2_sata_init_one,
+	.remove			= ata_pci_remove_one,
+};
+
+
+static int __init k2_sata_init(void)
+{
+	return pci_register_driver(&k2_sata_pci_driver);
+}
+
+
+static void __exit k2_sata_exit(void)
+{
+	pci_unregister_driver(&k2_sata_pci_driver);
+}
+
+
+MODULE_AUTHOR("Benjamin Herrenschmidt");
+MODULE_DESCRIPTION("low-level driver for K2 SATA controller");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, k2_sata_pci_tbl);
+MODULE_VERSION(DRV_VERSION);
+
+module_init(k2_sata_init);
+module_exit(k2_sata_exit);
diff --git a/drivers/ata/sata_sx4.c b/drivers/ata/sata_sx4.c
new file mode 100644
index 0000000..0da83cb
--- /dev/null
+++ b/drivers/ata/sata_sx4.c
@@ -0,0 +1,1502 @@
+/*
+ *  sata_sx4.c - Promise SATA
+ *
+ *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
+ *  		    Please ALWAYS copy linux-ide@vger.kernel.org
+ *		    on emails.
+ *
+ *  Copyright 2003-2004 Red Hat, Inc.
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ *  libata documentation is available via 'make {ps|pdf}docs',
+ *  as Documentation/DocBook/libata.*
+ *
+ *  Hardware documentation available under NDA.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+#include <linux/device.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_cmnd.h>
+#include <linux/libata.h>
+#include <asm/io.h>
+#include "sata_promise.h"
+
+#define DRV_NAME	"sata_sx4"
+#define DRV_VERSION	"0.9"
+
+
+enum {
+	PDC_PRD_TBL		= 0x44,	/* Direct command DMA table addr */
+
+	PDC_PKT_SUBMIT		= 0x40, /* Command packet pointer addr */
+	PDC_HDMA_PKT_SUBMIT	= 0x100, /* Host DMA packet pointer addr */
+	PDC_INT_SEQMASK		= 0x40,	/* Mask of asserted SEQ INTs */
+	PDC_HDMA_CTLSTAT	= 0x12C, /* Host DMA control / status */
+
+	PDC_20621_SEQCTL	= 0x400,
+	PDC_20621_SEQMASK	= 0x480,
+	PDC_20621_GENERAL_CTL	= 0x484,
+	PDC_20621_PAGE_SIZE	= (32 * 1024),
+
+	/* chosen, not constant, values; we design our own DIMM mem map */
+	PDC_20621_DIMM_WINDOW	= 0x0C,	/* page# for 32K DIMM window */
+	PDC_20621_DIMM_BASE	= 0x00200000,
+	PDC_20621_DIMM_DATA	= (64 * 1024),
+	PDC_DIMM_DATA_STEP	= (256 * 1024),
+	PDC_DIMM_WINDOW_STEP	= (8 * 1024),
+	PDC_DIMM_HOST_PRD	= (6 * 1024),
+	PDC_DIMM_HOST_PKT	= (128 * 0),
+	PDC_DIMM_HPKT_PRD	= (128 * 1),
+	PDC_DIMM_ATA_PKT	= (128 * 2),
+	PDC_DIMM_APKT_PRD	= (128 * 3),
+	PDC_DIMM_HEADER_SZ	= PDC_DIMM_APKT_PRD + 128,
+	PDC_PAGE_WINDOW		= 0x40,
+	PDC_PAGE_DATA		= PDC_PAGE_WINDOW +
+				  (PDC_20621_DIMM_DATA / PDC_20621_PAGE_SIZE),
+	PDC_PAGE_SET		= PDC_DIMM_DATA_STEP / PDC_20621_PAGE_SIZE,
+
+	PDC_CHIP0_OFS		= 0xC0000, /* offset of chip #0 */
+
+	PDC_20621_ERR_MASK	= (1<<19) | (1<<20) | (1<<21) | (1<<22) |
+				  (1<<23),
+
+	board_20621		= 0,	/* FastTrak S150 SX4 */
+
+	PDC_RESET		= (1 << 11), /* HDMA reset */
+
+	PDC_MAX_HDMA		= 32,
+	PDC_HDMA_Q_MASK		= (PDC_MAX_HDMA - 1),
+
+	PDC_DIMM0_SPD_DEV_ADDRESS     = 0x50,
+	PDC_DIMM1_SPD_DEV_ADDRESS     = 0x51,
+	PDC_MAX_DIMM_MODULE           = 0x02,
+	PDC_I2C_CONTROL_OFFSET        = 0x48,
+	PDC_I2C_ADDR_DATA_OFFSET      = 0x4C,
+	PDC_DIMM0_CONTROL_OFFSET      = 0x80,
+	PDC_DIMM1_CONTROL_OFFSET      = 0x84,
+	PDC_SDRAM_CONTROL_OFFSET      = 0x88,
+	PDC_I2C_WRITE                 = 0x00000000,
+	PDC_I2C_READ                  = 0x00000040,
+	PDC_I2C_START                 = 0x00000080,
+	PDC_I2C_MASK_INT              = 0x00000020,
+	PDC_I2C_COMPLETE              = 0x00010000,
+	PDC_I2C_NO_ACK                = 0x00100000,
+	PDC_DIMM_SPD_SUBADDRESS_START = 0x00,
+	PDC_DIMM_SPD_SUBADDRESS_END   = 0x7F,
+	PDC_DIMM_SPD_ROW_NUM          = 3,
+	PDC_DIMM_SPD_COLUMN_NUM       = 4,
+	PDC_DIMM_SPD_MODULE_ROW       = 5,
+	PDC_DIMM_SPD_TYPE             = 11,
+	PDC_DIMM_SPD_FRESH_RATE       = 12,
+	PDC_DIMM_SPD_BANK_NUM         = 17,
+	PDC_DIMM_SPD_CAS_LATENCY      = 18,
+	PDC_DIMM_SPD_ATTRIBUTE        = 21,
+	PDC_DIMM_SPD_ROW_PRE_CHARGE   = 27,
+	PDC_DIMM_SPD_ROW_ACTIVE_DELAY = 28,
+	PDC_DIMM_SPD_RAS_CAS_DELAY    = 29,
+	PDC_DIMM_SPD_ACTIVE_PRECHARGE = 30,
+	PDC_DIMM_SPD_SYSTEM_FREQ      = 126,
+	PDC_CTL_STATUS		      = 0x08,
+	PDC_DIMM_WINDOW_CTLR	      = 0x0C,
+	PDC_TIME_CONTROL              = 0x3C,
+	PDC_TIME_PERIOD               = 0x40,
+	PDC_TIME_COUNTER              = 0x44,
+	PDC_GENERAL_CTLR	      = 0x484,
+	PCI_PLL_INIT                  = 0x8A531824,
+	PCI_X_TCOUNT                  = 0xEE1E5CFF
+};
+
+
+struct pdc_port_priv {
+	u8			dimm_buf[(ATA_PRD_SZ * ATA_MAX_PRD) + 512];
+	u8			*pkt;
+	dma_addr_t		pkt_dma;
+};
+
+struct pdc_host_priv {
+	void			__iomem *dimm_mmio;
+
+	unsigned int		doing_hdma;
+	unsigned int		hdma_prod;
+	unsigned int		hdma_cons;
+	struct {
+		struct ata_queued_cmd *qc;
+		unsigned int	seq;
+		unsigned long	pkt_ofs;
+	} hdma[32];
+};
+
+
+static int pdc_sata_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
+static irqreturn_t pdc20621_interrupt (int irq, void *dev_instance, struct pt_regs *regs);
+static void pdc_eng_timeout(struct ata_port *ap);
+static void pdc_20621_phy_reset (struct ata_port *ap);
+static int pdc_port_start(struct ata_port *ap);
+static void pdc_port_stop(struct ata_port *ap);
+static void pdc20621_qc_prep(struct ata_queued_cmd *qc);
+static void pdc_tf_load_mmio(struct ata_port *ap, const struct ata_taskfile *tf);
+static void pdc_exec_command_mmio(struct ata_port *ap, const struct ata_taskfile *tf);
+static void pdc20621_host_stop(struct ata_host_set *host_set);
+static unsigned int pdc20621_dimm_init(struct ata_probe_ent *pe);
+static int pdc20621_detect_dimm(struct ata_probe_ent *pe);
+static unsigned int pdc20621_i2c_read(struct ata_probe_ent *pe,
+				      u32 device, u32 subaddr, u32 *pdata);
+static int pdc20621_prog_dimm0(struct ata_probe_ent *pe);
+static unsigned int pdc20621_prog_dimm_global(struct ata_probe_ent *pe);
+#ifdef ATA_VERBOSE_DEBUG
+static void pdc20621_get_from_dimm(struct ata_probe_ent *pe,
+				   void *psource, u32 offset, u32 size);
+#endif
+static void pdc20621_put_to_dimm(struct ata_probe_ent *pe,
+				 void *psource, u32 offset, u32 size);
+static void pdc20621_irq_clear(struct ata_port *ap);
+static unsigned int pdc20621_qc_issue_prot(struct ata_queued_cmd *qc);
+
+
+static struct scsi_host_template pdc_sata_sht = {
+	.module			= THIS_MODULE,
+	.name			= DRV_NAME,
+	.ioctl			= ata_scsi_ioctl,
+	.queuecommand		= ata_scsi_queuecmd,
+	.can_queue		= ATA_DEF_QUEUE,
+	.this_id		= ATA_SHT_THIS_ID,
+	.sg_tablesize		= LIBATA_MAX_PRD,
+	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
+	.emulated		= ATA_SHT_EMULATED,
+	.use_clustering		= ATA_SHT_USE_CLUSTERING,
+	.proc_name		= DRV_NAME,
+	.dma_boundary		= ATA_DMA_BOUNDARY,
+	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
+	.bios_param		= ata_std_bios_param,
+};
+
+static const struct ata_port_operations pdc_20621_ops = {
+	.port_disable		= ata_port_disable,
+	.tf_load		= pdc_tf_load_mmio,
+	.tf_read		= ata_tf_read,
+	.check_status		= ata_check_status,
+	.exec_command		= pdc_exec_command_mmio,
+	.dev_select		= ata_std_dev_select,
+	.phy_reset		= pdc_20621_phy_reset,
+	.qc_prep		= pdc20621_qc_prep,
+	.qc_issue		= pdc20621_qc_issue_prot,
+	.data_xfer		= ata_mmio_data_xfer,
+	.eng_timeout		= pdc_eng_timeout,
+	.irq_handler		= pdc20621_interrupt,
+	.irq_clear		= pdc20621_irq_clear,
+	.port_start		= pdc_port_start,
+	.port_stop		= pdc_port_stop,
+	.host_stop		= pdc20621_host_stop,
+};
+
+static const struct ata_port_info pdc_port_info[] = {
+	/* board_20621 */
+	{
+		.sht		= &pdc_sata_sht,
+		.host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+				  ATA_FLAG_SRST | ATA_FLAG_MMIO |
+				  ATA_FLAG_NO_ATAPI | ATA_FLAG_PIO_POLLING,
+		.pio_mask	= 0x1f, /* pio0-4 */
+		.mwdma_mask	= 0x07, /* mwdma0-2 */
+		.udma_mask	= 0x7f, /* udma0-6 ; FIXME */
+		.port_ops	= &pdc_20621_ops,
+	},
+
+};
+
+static const struct pci_device_id pdc_sata_pci_tbl[] = {
+	{ PCI_VENDOR_ID_PROMISE, 0x6622, PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+	  board_20621 },
+	{ }	/* terminate list */
+};
+
+
+static struct pci_driver pdc_sata_pci_driver = {
+	.name			= DRV_NAME,
+	.id_table		= pdc_sata_pci_tbl,
+	.probe			= pdc_sata_init_one,
+	.remove			= ata_pci_remove_one,
+};
+
+
+static void pdc20621_host_stop(struct ata_host_set *host_set)
+{
+	struct pci_dev *pdev = to_pci_dev(host_set->dev);
+	struct pdc_host_priv *hpriv = host_set->private_data;
+	void __iomem *dimm_mmio = hpriv->dimm_mmio;
+
+	pci_iounmap(pdev, dimm_mmio);
+	kfree(hpriv);
+
+	pci_iounmap(pdev, host_set->mmio_base);
+}
+
+static int pdc_port_start(struct ata_port *ap)
+{
+	struct device *dev = ap->host_set->dev;
+	struct pdc_port_priv *pp;
+	int rc;
+
+	rc = ata_port_start(ap);
+	if (rc)
+		return rc;
+
+	pp = kmalloc(sizeof(*pp), GFP_KERNEL);
+	if (!pp) {
+		rc = -ENOMEM;
+		goto err_out;
+	}
+	memset(pp, 0, sizeof(*pp));
+
+	pp->pkt = dma_alloc_coherent(dev, 128, &pp->pkt_dma, GFP_KERNEL);
+	if (!pp->pkt) {
+		rc = -ENOMEM;
+		goto err_out_kfree;
+	}
+
+	ap->private_data = pp;
+
+	return 0;
+
+err_out_kfree:
+	kfree(pp);
+err_out:
+	ata_port_stop(ap);
+	return rc;
+}
+
+
+static void pdc_port_stop(struct ata_port *ap)
+{
+	struct device *dev = ap->host_set->dev;
+	struct pdc_port_priv *pp = ap->private_data;
+
+	ap->private_data = NULL;
+	dma_free_coherent(dev, 128, pp->pkt, pp->pkt_dma);
+	kfree(pp);
+	ata_port_stop(ap);
+}
+
+
+static void pdc_20621_phy_reset (struct ata_port *ap)
+{
+	VPRINTK("ENTER\n");
+        ap->cbl = ATA_CBL_SATA;
+        ata_port_probe(ap);
+        ata_bus_reset(ap);
+}
+
+static inline void pdc20621_ata_sg(struct ata_taskfile *tf, u8 *buf,
+				    	   unsigned int portno,
+					   unsigned int total_len)
+{
+	u32 addr;
+	unsigned int dw = PDC_DIMM_APKT_PRD >> 2;
+	u32 *buf32 = (u32 *) buf;
+
+	/* output ATA packet S/G table */
+	addr = PDC_20621_DIMM_BASE + PDC_20621_DIMM_DATA +
+	       (PDC_DIMM_DATA_STEP * portno);
+	VPRINTK("ATA sg addr 0x%x, %d\n", addr, addr);
+	buf32[dw] = cpu_to_le32(addr);
+	buf32[dw + 1] = cpu_to_le32(total_len | ATA_PRD_EOT);
+
+	VPRINTK("ATA PSG @ %x == (0x%x, 0x%x)\n",
+		PDC_20621_DIMM_BASE +
+		       (PDC_DIMM_WINDOW_STEP * portno) +
+		       PDC_DIMM_APKT_PRD,
+		buf32[dw], buf32[dw + 1]);
+}
+
+static inline void pdc20621_host_sg(struct ata_taskfile *tf, u8 *buf,
+				    	    unsigned int portno,
+					    unsigned int total_len)
+{
+	u32 addr;
+	unsigned int dw = PDC_DIMM_HPKT_PRD >> 2;
+	u32 *buf32 = (u32 *) buf;
+
+	/* output Host DMA packet S/G table */
+	addr = PDC_20621_DIMM_BASE + PDC_20621_DIMM_DATA +
+	       (PDC_DIMM_DATA_STEP * portno);
+
+	buf32[dw] = cpu_to_le32(addr);
+	buf32[dw + 1] = cpu_to_le32(total_len | ATA_PRD_EOT);
+
+	VPRINTK("HOST PSG @ %x == (0x%x, 0x%x)\n",
+		PDC_20621_DIMM_BASE +
+		       (PDC_DIMM_WINDOW_STEP * portno) +
+		       PDC_DIMM_HPKT_PRD,
+		buf32[dw], buf32[dw + 1]);
+}
+
+static inline unsigned int pdc20621_ata_pkt(struct ata_taskfile *tf,
+					    unsigned int devno, u8 *buf,
+					    unsigned int portno)
+{
+	unsigned int i, dw;
+	u32 *buf32 = (u32 *) buf;
+	u8 dev_reg;
+
+	unsigned int dimm_sg = PDC_20621_DIMM_BASE +
+			       (PDC_DIMM_WINDOW_STEP * portno) +
+			       PDC_DIMM_APKT_PRD;
+	VPRINTK("ENTER, dimm_sg == 0x%x, %d\n", dimm_sg, dimm_sg);
+
+	i = PDC_DIMM_ATA_PKT;
+
+	/*
+	 * Set up ATA packet
+	 */
+	if ((tf->protocol == ATA_PROT_DMA) && (!(tf->flags & ATA_TFLAG_WRITE)))
+		buf[i++] = PDC_PKT_READ;
+	else if (tf->protocol == ATA_PROT_NODATA)
+		buf[i++] = PDC_PKT_NODATA;
+	else
+		buf[i++] = 0;
+	buf[i++] = 0;			/* reserved */
+	buf[i++] = portno + 1;		/* seq. id */
+	buf[i++] = 0xff;		/* delay seq. id */
+
+	/* dimm dma S/G, and next-pkt */
+	dw = i >> 2;
+	if (tf->protocol == ATA_PROT_NODATA)
+		buf32[dw] = 0;
+	else
+		buf32[dw] = cpu_to_le32(dimm_sg);
+	buf32[dw + 1] = 0;
+	i += 8;
+
+	if (devno == 0)
+		dev_reg = ATA_DEVICE_OBS;
+	else
+		dev_reg = ATA_DEVICE_OBS | ATA_DEV1;
+
+	/* select device */
+	buf[i++] = (1 << 5) | PDC_PKT_CLEAR_BSY | ATA_REG_DEVICE;
+	buf[i++] = dev_reg;
+
+	/* device control register */
+	buf[i++] = (1 << 5) | PDC_REG_DEVCTL;
+	buf[i++] = tf->ctl;
+
+	return i;
+}
+
+static inline void pdc20621_host_pkt(struct ata_taskfile *tf, u8 *buf,
+				     unsigned int portno)
+{
+	unsigned int dw;
+	u32 tmp, *buf32 = (u32 *) buf;
+
+	unsigned int host_sg = PDC_20621_DIMM_BASE +
+			       (PDC_DIMM_WINDOW_STEP * portno) +
+			       PDC_DIMM_HOST_PRD;
+	unsigned int dimm_sg = PDC_20621_DIMM_BASE +
+			       (PDC_DIMM_WINDOW_STEP * portno) +
+			       PDC_DIMM_HPKT_PRD;
+	VPRINTK("ENTER, dimm_sg == 0x%x, %d\n", dimm_sg, dimm_sg);
+	VPRINTK("host_sg == 0x%x, %d\n", host_sg, host_sg);
+
+	dw = PDC_DIMM_HOST_PKT >> 2;
+
+	/*
+	 * Set up Host DMA packet
+	 */
+	if ((tf->protocol == ATA_PROT_DMA) && (!(tf->flags & ATA_TFLAG_WRITE)))
+		tmp = PDC_PKT_READ;
+	else
+		tmp = 0;
+	tmp |= ((portno + 1 + 4) << 16);	/* seq. id */
+	tmp |= (0xff << 24);			/* delay seq. id */
+	buf32[dw + 0] = cpu_to_le32(tmp);
+	buf32[dw + 1] = cpu_to_le32(host_sg);
+	buf32[dw + 2] = cpu_to_le32(dimm_sg);
+	buf32[dw + 3] = 0;
+
+	VPRINTK("HOST PKT @ %x == (0x%x 0x%x 0x%x 0x%x)\n",
+		PDC_20621_DIMM_BASE + (PDC_DIMM_WINDOW_STEP * portno) +
+			PDC_DIMM_HOST_PKT,
+		buf32[dw + 0],
+		buf32[dw + 1],
+		buf32[dw + 2],
+		buf32[dw + 3]);
+}
+
+static void pdc20621_dma_prep(struct ata_queued_cmd *qc)
+{
+	struct scatterlist *sg;
+	struct ata_port *ap = qc->ap;
+	struct pdc_port_priv *pp = ap->private_data;
+	void __iomem *mmio = ap->host_set->mmio_base;
+	struct pdc_host_priv *hpriv = ap->host_set->private_data;
+	void __iomem *dimm_mmio = hpriv->dimm_mmio;
+	unsigned int portno = ap->port_no;
+	unsigned int i, idx, total_len = 0, sgt_len;
+	u32 *buf = (u32 *) &pp->dimm_buf[PDC_DIMM_HEADER_SZ];
+
+	WARN_ON(!(qc->flags & ATA_QCFLAG_DMAMAP));
+
+	VPRINTK("ata%u: ENTER\n", ap->id);
+
+	/* hard-code chip #0 */
+	mmio += PDC_CHIP0_OFS;
+
+	/*
+	 * Build S/G table
+	 */
+	idx = 0;
+	ata_for_each_sg(sg, qc) {
+		buf[idx++] = cpu_to_le32(sg_dma_address(sg));
+		buf[idx++] = cpu_to_le32(sg_dma_len(sg));
+		total_len += sg_dma_len(sg);
+	}
+	buf[idx - 1] |= cpu_to_le32(ATA_PRD_EOT);
+	sgt_len = idx * 4;
+
+	/*
+	 * Build ATA, host DMA packets
+	 */
+	pdc20621_host_sg(&qc->tf, &pp->dimm_buf[0], portno, total_len);
+	pdc20621_host_pkt(&qc->tf, &pp->dimm_buf[0], portno);
+
+	pdc20621_ata_sg(&qc->tf, &pp->dimm_buf[0], portno, total_len);
+	i = pdc20621_ata_pkt(&qc->tf, qc->dev->devno, &pp->dimm_buf[0], portno);
+
+	if (qc->tf.flags & ATA_TFLAG_LBA48)
+		i = pdc_prep_lba48(&qc->tf, &pp->dimm_buf[0], i);
+	else
+		i = pdc_prep_lba28(&qc->tf, &pp->dimm_buf[0], i);
+
+	pdc_pkt_footer(&qc->tf, &pp->dimm_buf[0], i);
+
+	/* copy three S/G tables and two packets to DIMM MMIO window */
+	memcpy_toio(dimm_mmio + (portno * PDC_DIMM_WINDOW_STEP),
+		    &pp->dimm_buf, PDC_DIMM_HEADER_SZ);
+	memcpy_toio(dimm_mmio + (portno * PDC_DIMM_WINDOW_STEP) +
+		    PDC_DIMM_HOST_PRD,
+		    &pp->dimm_buf[PDC_DIMM_HEADER_SZ], sgt_len);
+
+	/* force host FIFO dump */
+	writel(0x00000001, mmio + PDC_20621_GENERAL_CTL);
+
+	readl(dimm_mmio);	/* MMIO PCI posting flush */
+
+	VPRINTK("ata pkt buf ofs %u, prd size %u, mmio copied\n", i, sgt_len);
+}
+
+static void pdc20621_nodata_prep(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct pdc_port_priv *pp = ap->private_data;
+	void __iomem *mmio = ap->host_set->mmio_base;
+	struct pdc_host_priv *hpriv = ap->host_set->private_data;
+	void __iomem *dimm_mmio = hpriv->dimm_mmio;
+	unsigned int portno = ap->port_no;
+	unsigned int i;
+
+	VPRINTK("ata%u: ENTER\n", ap->id);
+
+	/* hard-code chip #0 */
+	mmio += PDC_CHIP0_OFS;
+
+	i = pdc20621_ata_pkt(&qc->tf, qc->dev->devno, &pp->dimm_buf[0], portno);
+
+	if (qc->tf.flags & ATA_TFLAG_LBA48)
+		i = pdc_prep_lba48(&qc->tf, &pp->dimm_buf[0], i);
+	else
+		i = pdc_prep_lba28(&qc->tf, &pp->dimm_buf[0], i);
+
+	pdc_pkt_footer(&qc->tf, &pp->dimm_buf[0], i);
+
+	/* copy three S/G tables and two packets to DIMM MMIO window */
+	memcpy_toio(dimm_mmio + (portno * PDC_DIMM_WINDOW_STEP),
+		    &pp->dimm_buf, PDC_DIMM_HEADER_SZ);
+
+	/* force host FIFO dump */
+	writel(0x00000001, mmio + PDC_20621_GENERAL_CTL);
+
+	readl(dimm_mmio);	/* MMIO PCI posting flush */
+
+	VPRINTK("ata pkt buf ofs %u, mmio copied\n", i);
+}
+
+static void pdc20621_qc_prep(struct ata_queued_cmd *qc)
+{
+	switch (qc->tf.protocol) {
+	case ATA_PROT_DMA:
+		pdc20621_dma_prep(qc);
+		break;
+	case ATA_PROT_NODATA:
+		pdc20621_nodata_prep(qc);
+		break;
+	default:
+		break;
+	}
+}
+
+static void __pdc20621_push_hdma(struct ata_queued_cmd *qc,
+				 unsigned int seq,
+				 u32 pkt_ofs)
+{
+	struct ata_port *ap = qc->ap;
+	struct ata_host_set *host_set = ap->host_set;
+	void __iomem *mmio = host_set->mmio_base;
+
+	/* hard-code chip #0 */
+	mmio += PDC_CHIP0_OFS;
+
+	writel(0x00000001, mmio + PDC_20621_SEQCTL + (seq * 4));
+	readl(mmio + PDC_20621_SEQCTL + (seq * 4));	/* flush */
+
+	writel(pkt_ofs, mmio + PDC_HDMA_PKT_SUBMIT);
+	readl(mmio + PDC_HDMA_PKT_SUBMIT);	/* flush */
+}
+
+static void pdc20621_push_hdma(struct ata_queued_cmd *qc,
+				unsigned int seq,
+				u32 pkt_ofs)
+{
+	struct ata_port *ap = qc->ap;
+	struct pdc_host_priv *pp = ap->host_set->private_data;
+	unsigned int idx = pp->hdma_prod & PDC_HDMA_Q_MASK;
+
+	if (!pp->doing_hdma) {
+		__pdc20621_push_hdma(qc, seq, pkt_ofs);
+		pp->doing_hdma = 1;
+		return;
+	}
+
+	pp->hdma[idx].qc = qc;
+	pp->hdma[idx].seq = seq;
+	pp->hdma[idx].pkt_ofs = pkt_ofs;
+	pp->hdma_prod++;
+}
+
+static void pdc20621_pop_hdma(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct pdc_host_priv *pp = ap->host_set->private_data;
+	unsigned int idx = pp->hdma_cons & PDC_HDMA_Q_MASK;
+
+	/* if nothing on queue, we're done */
+	if (pp->hdma_prod == pp->hdma_cons) {
+		pp->doing_hdma = 0;
+		return;
+	}
+
+	__pdc20621_push_hdma(pp->hdma[idx].qc, pp->hdma[idx].seq,
+			     pp->hdma[idx].pkt_ofs);
+	pp->hdma_cons++;
+}
+
+#ifdef ATA_VERBOSE_DEBUG
+static void pdc20621_dump_hdma(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	unsigned int port_no = ap->port_no;
+	struct pdc_host_priv *hpriv = ap->host_set->private_data;
+	void *dimm_mmio = hpriv->dimm_mmio;
+
+	dimm_mmio += (port_no * PDC_DIMM_WINDOW_STEP);
+	dimm_mmio += PDC_DIMM_HOST_PKT;
+
+	printk(KERN_ERR "HDMA[0] == 0x%08X\n", readl(dimm_mmio));
+	printk(KERN_ERR "HDMA[1] == 0x%08X\n", readl(dimm_mmio + 4));
+	printk(KERN_ERR "HDMA[2] == 0x%08X\n", readl(dimm_mmio + 8));
+	printk(KERN_ERR "HDMA[3] == 0x%08X\n", readl(dimm_mmio + 12));
+}
+#else
+static inline void pdc20621_dump_hdma(struct ata_queued_cmd *qc) { }
+#endif /* ATA_VERBOSE_DEBUG */
+
+static void pdc20621_packet_start(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct ata_host_set *host_set = ap->host_set;
+	unsigned int port_no = ap->port_no;
+	void __iomem *mmio = host_set->mmio_base;
+	unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE);
+	u8 seq = (u8) (port_no + 1);
+	unsigned int port_ofs;
+
+	/* hard-code chip #0 */
+	mmio += PDC_CHIP0_OFS;
+
+	VPRINTK("ata%u: ENTER\n", ap->id);
+
+	wmb();			/* flush PRD, pkt writes */
+
+	port_ofs = PDC_20621_DIMM_BASE + (PDC_DIMM_WINDOW_STEP * port_no);
+
+	/* if writing, we (1) DMA to DIMM, then (2) do ATA command */
+	if (rw && qc->tf.protocol == ATA_PROT_DMA) {
+		seq += 4;
+
+		pdc20621_dump_hdma(qc);
+		pdc20621_push_hdma(qc, seq, port_ofs + PDC_DIMM_HOST_PKT);
+		VPRINTK("queued ofs 0x%x (%u), seq %u\n",
+			port_ofs + PDC_DIMM_HOST_PKT,
+			port_ofs + PDC_DIMM_HOST_PKT,
+			seq);
+	} else {
+		writel(0x00000001, mmio + PDC_20621_SEQCTL + (seq * 4));
+		readl(mmio + PDC_20621_SEQCTL + (seq * 4));	/* flush */
+
+		writel(port_ofs + PDC_DIMM_ATA_PKT,
+		       (void __iomem *) ap->ioaddr.cmd_addr + PDC_PKT_SUBMIT);
+		readl((void __iomem *) ap->ioaddr.cmd_addr + PDC_PKT_SUBMIT);
+		VPRINTK("submitted ofs 0x%x (%u), seq %u\n",
+			port_ofs + PDC_DIMM_ATA_PKT,
+			port_ofs + PDC_DIMM_ATA_PKT,
+			seq);
+	}
+}
+
+static unsigned int pdc20621_qc_issue_prot(struct ata_queued_cmd *qc)
+{
+	switch (qc->tf.protocol) {
+	case ATA_PROT_DMA:
+	case ATA_PROT_NODATA:
+		pdc20621_packet_start(qc);
+		return 0;
+
+	case ATA_PROT_ATAPI_DMA:
+		BUG();
+		break;
+
+	default:
+		break;
+	}
+
+	return ata_qc_issue_prot(qc);
+}
+
+static inline unsigned int pdc20621_host_intr( struct ata_port *ap,
+                                          struct ata_queued_cmd *qc,
+					  unsigned int doing_hdma,
+					  void __iomem *mmio)
+{
+	unsigned int port_no = ap->port_no;
+	unsigned int port_ofs =
+		PDC_20621_DIMM_BASE + (PDC_DIMM_WINDOW_STEP * port_no);
+	u8 status;
+	unsigned int handled = 0;
+
+	VPRINTK("ENTER\n");
+
+	if ((qc->tf.protocol == ATA_PROT_DMA) &&	/* read */
+	    (!(qc->tf.flags & ATA_TFLAG_WRITE))) {
+
+		/* step two - DMA from DIMM to host */
+		if (doing_hdma) {
+			VPRINTK("ata%u: read hdma, 0x%x 0x%x\n", ap->id,
+				readl(mmio + 0x104), readl(mmio + PDC_HDMA_CTLSTAT));
+			/* get drive status; clear intr; complete txn */
+			qc->err_mask |= ac_err_mask(ata_wait_idle(ap));
+			ata_qc_complete(qc);
+			pdc20621_pop_hdma(qc);
+		}
+
+		/* step one - exec ATA command */
+		else {
+			u8 seq = (u8) (port_no + 1 + 4);
+			VPRINTK("ata%u: read ata, 0x%x 0x%x\n", ap->id,
+				readl(mmio + 0x104), readl(mmio + PDC_HDMA_CTLSTAT));
+
+			/* submit hdma pkt */
+			pdc20621_dump_hdma(qc);
+			pdc20621_push_hdma(qc, seq,
+					   port_ofs + PDC_DIMM_HOST_PKT);
+		}
+		handled = 1;
+
+	} else if (qc->tf.protocol == ATA_PROT_DMA) {	/* write */
+
+		/* step one - DMA from host to DIMM */
+		if (doing_hdma) {
+			u8 seq = (u8) (port_no + 1);
+			VPRINTK("ata%u: write hdma, 0x%x 0x%x\n", ap->id,
+				readl(mmio + 0x104), readl(mmio + PDC_HDMA_CTLSTAT));
+
+			/* submit ata pkt */
+			writel(0x00000001, mmio + PDC_20621_SEQCTL + (seq * 4));
+			readl(mmio + PDC_20621_SEQCTL + (seq * 4));
+			writel(port_ofs + PDC_DIMM_ATA_PKT,
+			       (void __iomem *) ap->ioaddr.cmd_addr + PDC_PKT_SUBMIT);
+			readl((void __iomem *) ap->ioaddr.cmd_addr + PDC_PKT_SUBMIT);
+		}
+
+		/* step two - execute ATA command */
+		else {
+			VPRINTK("ata%u: write ata, 0x%x 0x%x\n", ap->id,
+				readl(mmio + 0x104), readl(mmio + PDC_HDMA_CTLSTAT));
+			/* get drive status; clear intr; complete txn */
+			qc->err_mask |= ac_err_mask(ata_wait_idle(ap));
+			ata_qc_complete(qc);
+			pdc20621_pop_hdma(qc);
+		}
+		handled = 1;
+
+	/* command completion, but no data xfer */
+	} else if (qc->tf.protocol == ATA_PROT_NODATA) {
+
+		status = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
+		DPRINTK("BUS_NODATA (drv_stat 0x%X)\n", status);
+		qc->err_mask |= ac_err_mask(status);
+		ata_qc_complete(qc);
+		handled = 1;
+
+	} else {
+		ap->stats.idle_irq++;
+	}
+
+	return handled;
+}
+
+static void pdc20621_irq_clear(struct ata_port *ap)
+{
+	struct ata_host_set *host_set = ap->host_set;
+	void __iomem *mmio = host_set->mmio_base;
+
+	mmio += PDC_CHIP0_OFS;
+
+	readl(mmio + PDC_20621_SEQMASK);
+}
+
+static irqreturn_t pdc20621_interrupt (int irq, void *dev_instance, struct pt_regs *regs)
+{
+	struct ata_host_set *host_set = dev_instance;
+	struct ata_port *ap;
+	u32 mask = 0;
+	unsigned int i, tmp, port_no;
+	unsigned int handled = 0;
+	void __iomem *mmio_base;
+
+	VPRINTK("ENTER\n");
+
+	if (!host_set || !host_set->mmio_base) {
+		VPRINTK("QUICK EXIT\n");
+		return IRQ_NONE;
+	}
+
+	mmio_base = host_set->mmio_base;
+
+	/* reading should also clear interrupts */
+	mmio_base += PDC_CHIP0_OFS;
+	mask = readl(mmio_base + PDC_20621_SEQMASK);
+	VPRINTK("mask == 0x%x\n", mask);
+
+	if (mask == 0xffffffff) {
+		VPRINTK("QUICK EXIT 2\n");
+		return IRQ_NONE;
+	}
+	mask &= 0xffff;		/* only 16 tags possible */
+	if (!mask) {
+		VPRINTK("QUICK EXIT 3\n");
+		return IRQ_NONE;
+	}
+
+        spin_lock(&host_set->lock);
+
+        for (i = 1; i < 9; i++) {
+		port_no = i - 1;
+		if (port_no > 3)
+			port_no -= 4;
+		if (port_no >= host_set->n_ports)
+			ap = NULL;
+		else
+			ap = host_set->ports[port_no];
+		tmp = mask & (1 << i);
+		VPRINTK("seq %u, port_no %u, ap %p, tmp %x\n", i, port_no, ap, tmp);
+		if (tmp && ap &&
+		    !(ap->flags & ATA_FLAG_DISABLED)) {
+			struct ata_queued_cmd *qc;
+
+			qc = ata_qc_from_tag(ap, ap->active_tag);
+			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)))
+				handled += pdc20621_host_intr(ap, qc, (i > 4),
+							      mmio_base);
+		}
+	}
+
+        spin_unlock(&host_set->lock);
+
+	VPRINTK("mask == 0x%x\n", mask);
+
+	VPRINTK("EXIT\n");
+
+	return IRQ_RETVAL(handled);
+}
+
+static void pdc_eng_timeout(struct ata_port *ap)
+{
+	u8 drv_stat;
+	struct ata_host_set *host_set = ap->host_set;
+	struct ata_queued_cmd *qc;
+	unsigned long flags;
+
+	DPRINTK("ENTER\n");
+
+	spin_lock_irqsave(&host_set->lock, flags);
+
+	qc = ata_qc_from_tag(ap, ap->active_tag);
+
+	switch (qc->tf.protocol) {
+	case ATA_PROT_DMA:
+	case ATA_PROT_NODATA:
+		ata_port_printk(ap, KERN_ERR, "command timeout\n");
+		qc->err_mask |= __ac_err_mask(ata_wait_idle(ap));
+		break;
+
+	default:
+		drv_stat = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);
+
+		ata_port_printk(ap, KERN_ERR,
+				"unknown timeout, cmd 0x%x stat 0x%x\n",
+				qc->tf.command, drv_stat);
+
+		qc->err_mask |= ac_err_mask(drv_stat);
+		break;
+	}
+
+	spin_unlock_irqrestore(&host_set->lock, flags);
+	ata_eh_qc_complete(qc);
+	DPRINTK("EXIT\n");
+}
+
+static void pdc_tf_load_mmio(struct ata_port *ap, const struct ata_taskfile *tf)
+{
+	WARN_ON (tf->protocol == ATA_PROT_DMA ||
+		 tf->protocol == ATA_PROT_NODATA);
+	ata_tf_load(ap, tf);
+}
+
+
+static void pdc_exec_command_mmio(struct ata_port *ap, const struct ata_taskfile *tf)
+{
+	WARN_ON (tf->protocol == ATA_PROT_DMA ||
+		 tf->protocol == ATA_PROT_NODATA);
+	ata_exec_command(ap, tf);
+}
+
+
+static void pdc_sata_setup_port(struct ata_ioports *port, unsigned long base)
+{
+	port->cmd_addr		= base;
+	port->data_addr		= base;
+	port->feature_addr	=
+	port->error_addr	= base + 0x4;
+	port->nsect_addr	= base + 0x8;
+	port->lbal_addr		= base + 0xc;
+	port->lbam_addr		= base + 0x10;
+	port->lbah_addr		= base + 0x14;
+	port->device_addr	= base + 0x18;
+	port->command_addr	=
+	port->status_addr	= base + 0x1c;
+	port->altstatus_addr	=
+	port->ctl_addr		= base + 0x38;
+}
+
+
+#ifdef ATA_VERBOSE_DEBUG
+static void pdc20621_get_from_dimm(struct ata_probe_ent *pe, void *psource,
+				   u32 offset, u32 size)
+{
+	u32 window_size;
+	u16 idx;
+	u8 page_mask;
+	long dist;
+	void __iomem *mmio = pe->mmio_base;
+	struct pdc_host_priv *hpriv = pe->private_data;
+	void __iomem *dimm_mmio = hpriv->dimm_mmio;
+
+	/* hard-code chip #0 */
+	mmio += PDC_CHIP0_OFS;
+
+	page_mask = 0x00;
+   	window_size = 0x2000 * 4; /* 32K byte uchar size */
+	idx = (u16) (offset / window_size);
+
+	writel(0x01, mmio + PDC_GENERAL_CTLR);
+	readl(mmio + PDC_GENERAL_CTLR);
+	writel(((idx) << page_mask), mmio + PDC_DIMM_WINDOW_CTLR);
+	readl(mmio + PDC_DIMM_WINDOW_CTLR);
+
+	offset -= (idx * window_size);
+	idx++;
+	dist = ((long) (window_size - (offset + size))) >= 0 ? size :
+		(long) (window_size - offset);
+	memcpy_fromio((char *) psource, (char *) (dimm_mmio + offset / 4),
+		      dist);
+
+	psource += dist;
+	size -= dist;
+	for (; (long) size >= (long) window_size ;) {
+		writel(0x01, mmio + PDC_GENERAL_CTLR);
+		readl(mmio + PDC_GENERAL_CTLR);
+		writel(((idx) << page_mask), mmio + PDC_DIMM_WINDOW_CTLR);
+		readl(mmio + PDC_DIMM_WINDOW_CTLR);
+		memcpy_fromio((char *) psource, (char *) (dimm_mmio),
+			      window_size / 4);
+		psource += window_size;
+		size -= window_size;
+		idx ++;
+	}
+
+	if (size) {
+		writel(0x01, mmio + PDC_GENERAL_CTLR);
+		readl(mmio + PDC_GENERAL_CTLR);
+		writel(((idx) << page_mask), mmio + PDC_DIMM_WINDOW_CTLR);
+		readl(mmio + PDC_DIMM_WINDOW_CTLR);
+		memcpy_fromio((char *) psource, (char *) (dimm_mmio),
+			      size / 4);
+	}
+}
+#endif
+
+
+static void pdc20621_put_to_dimm(struct ata_probe_ent *pe, void *psource,
+				 u32 offset, u32 size)
+{
+	u32 window_size;
+	u16 idx;
+	u8 page_mask;
+	long dist;
+	void __iomem *mmio = pe->mmio_base;
+	struct pdc_host_priv *hpriv = pe->private_data;
+	void __iomem *dimm_mmio = hpriv->dimm_mmio;
+
+	/* hard-code chip #0 */
+	mmio += PDC_CHIP0_OFS;
+
+	page_mask = 0x00;
+   	window_size = 0x2000 * 4;       /* 32K byte uchar size */
+	idx = (u16) (offset / window_size);
+
+	writel(((idx) << page_mask), mmio + PDC_DIMM_WINDOW_CTLR);
+	readl(mmio + PDC_DIMM_WINDOW_CTLR);
+	offset -= (idx * window_size);
+	idx++;
+	dist = ((long)(s32)(window_size - (offset + size))) >= 0 ? size :
+		(long) (window_size - offset);
+	memcpy_toio(dimm_mmio + offset / 4, psource, dist);
+	writel(0x01, mmio + PDC_GENERAL_CTLR);
+	readl(mmio + PDC_GENERAL_CTLR);
+
+	psource += dist;
+	size -= dist;
+	for (; (long) size >= (long) window_size ;) {
+		writel(((idx) << page_mask), mmio + PDC_DIMM_WINDOW_CTLR);
+		readl(mmio + PDC_DIMM_WINDOW_CTLR);
+		memcpy_toio(dimm_mmio, psource, window_size / 4);
+		writel(0x01, mmio + PDC_GENERAL_CTLR);
+		readl(mmio + PDC_GENERAL_CTLR);
+		psource += window_size;
+		size -= window_size;
+		idx ++;
+	}
+
+	if (size) {
+		writel(((idx) << page_mask), mmio + PDC_DIMM_WINDOW_CTLR);
+		readl(mmio + PDC_DIMM_WINDOW_CTLR);
+		memcpy_toio(dimm_mmio, psource, size / 4);
+		writel(0x01, mmio + PDC_GENERAL_CTLR);
+		readl(mmio + PDC_GENERAL_CTLR);
+	}
+}
+
+
+static unsigned int pdc20621_i2c_read(struct ata_probe_ent *pe, u32 device,
+				      u32 subaddr, u32 *pdata)
+{
+	void __iomem *mmio = pe->mmio_base;
+	u32 i2creg  = 0;
+	u32 status;
+	u32 count =0;
+
+	/* hard-code chip #0 */
+	mmio += PDC_CHIP0_OFS;
+
+	i2creg |= device << 24;
+	i2creg |= subaddr << 16;
+
+	/* Set the device and subaddress */
+	writel(i2creg, mmio + PDC_I2C_ADDR_DATA_OFFSET);
+	readl(mmio + PDC_I2C_ADDR_DATA_OFFSET);
+
+	/* Write Control to perform read operation, mask int */
+	writel(PDC_I2C_READ | PDC_I2C_START | PDC_I2C_MASK_INT,
+	       mmio + PDC_I2C_CONTROL_OFFSET);
+
+	for (count = 0; count <= 1000; count ++) {
+		status = readl(mmio + PDC_I2C_CONTROL_OFFSET);
+		if (status & PDC_I2C_COMPLETE) {
+			status = readl(mmio + PDC_I2C_ADDR_DATA_OFFSET);
+			break;
+		} else if (count == 1000)
+			return 0;
+	}
+
+	*pdata = (status >> 8) & 0x000000ff;
+	return 1;
+}
+
+
+static int pdc20621_detect_dimm(struct ata_probe_ent *pe)
+{
+	u32 data=0 ;
+  	if (pdc20621_i2c_read(pe, PDC_DIMM0_SPD_DEV_ADDRESS,
+			     PDC_DIMM_SPD_SYSTEM_FREQ, &data)) {
+   		if (data == 100)
+			return 100;
+  	} else
+		return 0;
+
+   	if (pdc20621_i2c_read(pe, PDC_DIMM0_SPD_DEV_ADDRESS, 9, &data)) {
+		if(data <= 0x75)
+			return 133;
+   	} else
+		return 0;
+
+   	return 0;
+}
+
+
+static int pdc20621_prog_dimm0(struct ata_probe_ent *pe)
+{
+	u32 spd0[50];
+	u32 data = 0;
+   	int size, i;
+   	u8 bdimmsize;
+   	void __iomem *mmio = pe->mmio_base;
+	static const struct {
+		unsigned int reg;
+		unsigned int ofs;
+	} pdc_i2c_read_data [] = {
+		{ PDC_DIMM_SPD_TYPE, 11 },
+		{ PDC_DIMM_SPD_FRESH_RATE, 12 },
+		{ PDC_DIMM_SPD_COLUMN_NUM, 4 },
+		{ PDC_DIMM_SPD_ATTRIBUTE, 21 },
+		{ PDC_DIMM_SPD_ROW_NUM, 3 },
+		{ PDC_DIMM_SPD_BANK_NUM, 17 },
+		{ PDC_DIMM_SPD_MODULE_ROW, 5 },
+		{ PDC_DIMM_SPD_ROW_PRE_CHARGE, 27 },
+		{ PDC_DIMM_SPD_ROW_ACTIVE_DELAY, 28 },
+		{ PDC_DIMM_SPD_RAS_CAS_DELAY, 29 },
+		{ PDC_DIMM_SPD_ACTIVE_PRECHARGE, 30 },
+		{ PDC_DIMM_SPD_CAS_LATENCY, 18 },
+	};
+
+	/* hard-code chip #0 */
+	mmio += PDC_CHIP0_OFS;
+
+	for(i=0; i<ARRAY_SIZE(pdc_i2c_read_data); i++)
+		pdc20621_i2c_read(pe, PDC_DIMM0_SPD_DEV_ADDRESS,
+				  pdc_i2c_read_data[i].reg,
+				  &spd0[pdc_i2c_read_data[i].ofs]);
+
+   	data |= (spd0[4] - 8) | ((spd0[21] != 0) << 3) | ((spd0[3]-11) << 4);
+   	data |= ((spd0[17] / 4) << 6) | ((spd0[5] / 2) << 7) |
+		((((spd0[27] + 9) / 10) - 1) << 8) ;
+   	data |= (((((spd0[29] > spd0[28])
+		    ? spd0[29] : spd0[28]) + 9) / 10) - 1) << 10;
+   	data |= ((spd0[30] - spd0[29] + 9) / 10 - 2) << 12;
+
+   	if (spd0[18] & 0x08)
+		data |= ((0x03) << 14);
+   	else if (spd0[18] & 0x04)
+		data |= ((0x02) << 14);
+   	else if (spd0[18] & 0x01)
+		data |= ((0x01) << 14);
+   	else
+		data |= (0 << 14);
+
+  	/*
+	   Calculate the size of bDIMMSize (power of 2) and
+	   merge the DIMM size by program start/end address.
+	*/
+
+   	bdimmsize = spd0[4] + (spd0[5] / 2) + spd0[3] + (spd0[17] / 2) + 3;
+   	size = (1 << bdimmsize) >> 20;	/* size = xxx(MB) */
+   	data |= (((size / 16) - 1) << 16);
+   	data |= (0 << 23);
+	data |= 8;
+   	writel(data, mmio + PDC_DIMM0_CONTROL_OFFSET);
+	readl(mmio + PDC_DIMM0_CONTROL_OFFSET);
+   	return size;
+}
+
+
+static unsigned int pdc20621_prog_dimm_global(struct ata_probe_ent *pe)
+{
+	u32 data, spd0;
+   	int error, i;
+   	void __iomem *mmio = pe->mmio_base;
+
+	/* hard-code chip #0 */
+   	mmio += PDC_CHIP0_OFS;
+
+   	/*
+	  Set To Default : DIMM Module Global Control Register (0x022259F1)
+	  DIMM Arbitration Disable (bit 20)
+	  DIMM Data/Control Output Driving Selection (bit12 - bit15)
+	  Refresh Enable (bit 17)
+	*/
+
+	data = 0x022259F1;
+	writel(data, mmio + PDC_SDRAM_CONTROL_OFFSET);
+	readl(mmio + PDC_SDRAM_CONTROL_OFFSET);
+
+	/* Turn on for ECC */
+	pdc20621_i2c_read(pe, PDC_DIMM0_SPD_DEV_ADDRESS,
+			  PDC_DIMM_SPD_TYPE, &spd0);
+	if (spd0 == 0x02) {
+		data |= (0x01 << 16);
+		writel(data, mmio + PDC_SDRAM_CONTROL_OFFSET);
+		readl(mmio + PDC_SDRAM_CONTROL_OFFSET);
+		printk(KERN_ERR "Local DIMM ECC Enabled\n");
+   	}
+
+   	/* DIMM Initialization Select/Enable (bit 18/19) */
+   	data &= (~(1<<18));
+   	data |= (1<<19);
+   	writel(data, mmio + PDC_SDRAM_CONTROL_OFFSET);
+
+   	error = 1;
+   	for (i = 1; i <= 10; i++) {   /* polling ~5 secs */
+		data = readl(mmio + PDC_SDRAM_CONTROL_OFFSET);
+		if (!(data & (1<<19))) {
+	   		error = 0;
+	   		break;
+		}
+		msleep(i*100);
+   	}
+   	return error;
+}
+
+
+static unsigned int pdc20621_dimm_init(struct ata_probe_ent *pe)
+{
+	int speed, size, length;
+	u32 addr,spd0,pci_status;
+	u32 tmp=0;
+	u32 time_period=0;
+	u32 tcount=0;
+	u32 ticks=0;
+	u32 clock=0;
+	u32 fparam=0;
+   	void __iomem *mmio = pe->mmio_base;
+
+	/* hard-code chip #0 */
+   	mmio += PDC_CHIP0_OFS;
+
+	/* Initialize PLL based upon PCI Bus Frequency */
+
+	/* Initialize Time Period Register */
+	writel(0xffffffff, mmio + PDC_TIME_PERIOD);
+	time_period = readl(mmio + PDC_TIME_PERIOD);
+	VPRINTK("Time Period Register (0x40): 0x%x\n", time_period);
+
+	/* Enable timer */
+	writel(0x00001a0, mmio + PDC_TIME_CONTROL);
+	readl(mmio + PDC_TIME_CONTROL);
+
+	/* Wait 3 seconds */
+	msleep(3000);
+
+	/*
+	   When timer is enabled, counter is decreased every internal
+	   clock cycle.
+	*/
+
+	tcount = readl(mmio + PDC_TIME_COUNTER);
+	VPRINTK("Time Counter Register (0x44): 0x%x\n", tcount);
+
+	/*
+	   If SX4 is on PCI-X bus, after 3 seconds, the timer counter
+	   register should be >= (0xffffffff - 3x10^8).
+	*/
+	if(tcount >= PCI_X_TCOUNT) {
+		ticks = (time_period - tcount);
+		VPRINTK("Num counters 0x%x (%d)\n", ticks, ticks);
+
+		clock = (ticks / 300000);
+		VPRINTK("10 * Internal clk = 0x%x (%d)\n", clock, clock);
+
+		clock = (clock * 33);
+		VPRINTK("10 * Internal clk * 33 = 0x%x (%d)\n", clock, clock);
+
+		/* PLL F Param (bit 22:16) */
+		fparam = (1400000 / clock) - 2;
+		VPRINTK("PLL F Param: 0x%x (%d)\n", fparam, fparam);
+
+		/* OD param = 0x2 (bit 31:30), R param = 0x5 (bit 29:25) */
+		pci_status = (0x8a001824 | (fparam << 16));
+	} else
+		pci_status = PCI_PLL_INIT;
+
+	/* Initialize PLL. */
+	VPRINTK("pci_status: 0x%x\n", pci_status);
+	writel(pci_status, mmio + PDC_CTL_STATUS);
+	readl(mmio + PDC_CTL_STATUS);
+
+	/*
+	   Read SPD of DIMM by I2C interface,
+	   and program the DIMM Module Controller.
+	*/
+ 	if (!(speed = pdc20621_detect_dimm(pe))) {
+		printk(KERN_ERR "Detect Local DIMM Fail\n");
+		return 1;	/* DIMM error */
+   	}
+   	VPRINTK("Local DIMM Speed = %d\n", speed);
+
+   	/* Programming DIMM0 Module Control Register (index_CID0:80h) */
+   	size = pdc20621_prog_dimm0(pe);
+   	VPRINTK("Local DIMM Size = %dMB\n",size);
+
+   	/* Programming DIMM Module Global Control Register (index_CID0:88h) */
+   	if (pdc20621_prog_dimm_global(pe)) {
+		printk(KERN_ERR "Programming DIMM Module Global Control Register Fail\n");
+		return 1;
+   	}
+
+#ifdef ATA_VERBOSE_DEBUG
+	{
+		u8 test_parttern1[40] = {0x55,0xAA,'P','r','o','m','i','s','e',' ',
+  				'N','o','t',' ','Y','e','t',' ','D','e','f','i','n','e','d',' ',
+ 				 '1','.','1','0',
+  				'9','8','0','3','1','6','1','2',0,0};
+		u8 test_parttern2[40] = {0};
+
+		pdc20621_put_to_dimm(pe, (void *) test_parttern2, 0x10040, 40);
+		pdc20621_put_to_dimm(pe, (void *) test_parttern2, 0x40, 40);
+
+		pdc20621_put_to_dimm(pe, (void *) test_parttern1, 0x10040, 40);
+		pdc20621_get_from_dimm(pe, (void *) test_parttern2, 0x40, 40);
+		printk(KERN_ERR "%x, %x, %s\n", test_parttern2[0],
+		       test_parttern2[1], &(test_parttern2[2]));
+		pdc20621_get_from_dimm(pe, (void *) test_parttern2, 0x10040,
+				       40);
+		printk(KERN_ERR "%x, %x, %s\n", test_parttern2[0],
+		       test_parttern2[1], &(test_parttern2[2]));
+
+		pdc20621_put_to_dimm(pe, (void *) test_parttern1, 0x40, 40);
+		pdc20621_get_from_dimm(pe, (void *) test_parttern2, 0x40, 40);
+		printk(KERN_ERR "%x, %x, %s\n", test_parttern2[0],
+		       test_parttern2[1], &(test_parttern2[2]));
+	}
+#endif
+
+	/* ECC initiliazation. */
+
+	pdc20621_i2c_read(pe, PDC_DIMM0_SPD_DEV_ADDRESS,
+			  PDC_DIMM_SPD_TYPE, &spd0);
+	if (spd0 == 0x02) {
+		VPRINTK("Start ECC initialization\n");
+		addr = 0;
+		length = size * 1024 * 1024;
+		while (addr < length) {
+			pdc20621_put_to_dimm(pe, (void *) &tmp, addr,
+					     sizeof(u32));
+			addr += sizeof(u32);
+		}
+		VPRINTK("Finish ECC initialization\n");
+	}
+	return 0;
+}
+
+
+static void pdc_20621_init(struct ata_probe_ent *pe)
+{
+	u32 tmp;
+	void __iomem *mmio = pe->mmio_base;
+
+	/* hard-code chip #0 */
+	mmio += PDC_CHIP0_OFS;
+
+	/*
+	 * Select page 0x40 for our 32k DIMM window
+	 */
+	tmp = readl(mmio + PDC_20621_DIMM_WINDOW) & 0xffff0000;
+	tmp |= PDC_PAGE_WINDOW;	/* page 40h; arbitrarily selected */
+	writel(tmp, mmio + PDC_20621_DIMM_WINDOW);
+
+	/*
+	 * Reset Host DMA
+	 */
+	tmp = readl(mmio + PDC_HDMA_CTLSTAT);
+	tmp |= PDC_RESET;
+	writel(tmp, mmio + PDC_HDMA_CTLSTAT);
+	readl(mmio + PDC_HDMA_CTLSTAT);		/* flush */
+
+	udelay(10);
+
+	tmp = readl(mmio + PDC_HDMA_CTLSTAT);
+	tmp &= ~PDC_RESET;
+	writel(tmp, mmio + PDC_HDMA_CTLSTAT);
+	readl(mmio + PDC_HDMA_CTLSTAT);		/* flush */
+}
+
+static int pdc_sata_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	static int printed_version;
+	struct ata_probe_ent *probe_ent = NULL;
+	unsigned long base;
+	void __iomem *mmio_base;
+	void __iomem *dimm_mmio = NULL;
+	struct pdc_host_priv *hpriv = NULL;
+	unsigned int board_idx = (unsigned int) ent->driver_data;
+	int pci_dev_busy = 0;
+	int rc;
+
+	if (!printed_version++)
+		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
+
+	rc = pci_enable_device(pdev);
+	if (rc)
+		return rc;
+
+	rc = pci_request_regions(pdev, DRV_NAME);
+	if (rc) {
+		pci_dev_busy = 1;
+		goto err_out;
+	}
+
+	rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
+	if (rc)
+		goto err_out_regions;
+	rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
+	if (rc)
+		goto err_out_regions;
+
+	probe_ent = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
+	if (probe_ent == NULL) {
+		rc = -ENOMEM;
+		goto err_out_regions;
+	}
+
+	memset(probe_ent, 0, sizeof(*probe_ent));
+	probe_ent->dev = pci_dev_to_dev(pdev);
+	INIT_LIST_HEAD(&probe_ent->node);
+
+	mmio_base = pci_iomap(pdev, 3, 0);
+	if (mmio_base == NULL) {
+		rc = -ENOMEM;
+		goto err_out_free_ent;
+	}
+	base = (unsigned long) mmio_base;
+
+	hpriv = kmalloc(sizeof(*hpriv), GFP_KERNEL);
+	if (!hpriv) {
+		rc = -ENOMEM;
+		goto err_out_iounmap;
+	}
+	memset(hpriv, 0, sizeof(*hpriv));
+
+	dimm_mmio = pci_iomap(pdev, 4, 0);
+	if (!dimm_mmio) {
+		kfree(hpriv);
+		rc = -ENOMEM;
+		goto err_out_iounmap;
+	}
+
+	hpriv->dimm_mmio = dimm_mmio;
+
+	probe_ent->sht		= pdc_port_info[board_idx].sht;
+	probe_ent->host_flags	= pdc_port_info[board_idx].host_flags;
+	probe_ent->pio_mask	= pdc_port_info[board_idx].pio_mask;
+	probe_ent->mwdma_mask	= pdc_port_info[board_idx].mwdma_mask;
+	probe_ent->udma_mask	= pdc_port_info[board_idx].udma_mask;
+	probe_ent->port_ops	= pdc_port_info[board_idx].port_ops;
+
+       	probe_ent->irq = pdev->irq;
+       	probe_ent->irq_flags = IRQF_SHARED;
+	probe_ent->mmio_base = mmio_base;
+
+	probe_ent->private_data = hpriv;
+	base += PDC_CHIP0_OFS;
+
+	probe_ent->n_ports = 4;
+	pdc_sata_setup_port(&probe_ent->port[0], base + 0x200);
+	pdc_sata_setup_port(&probe_ent->port[1], base + 0x280);
+	pdc_sata_setup_port(&probe_ent->port[2], base + 0x300);
+	pdc_sata_setup_port(&probe_ent->port[3], base + 0x380);
+
+	pci_set_master(pdev);
+
+	/* initialize adapter */
+	/* initialize local dimm */
+	if (pdc20621_dimm_init(probe_ent)) {
+		rc = -ENOMEM;
+		goto err_out_iounmap_dimm;
+	}
+	pdc_20621_init(probe_ent);
+
+	/* FIXME: check ata_device_add return value */
+	ata_device_add(probe_ent);
+	kfree(probe_ent);
+
+	return 0;
+
+err_out_iounmap_dimm:		/* only get to this label if 20621 */
+	kfree(hpriv);
+	pci_iounmap(pdev, dimm_mmio);
+err_out_iounmap:
+	pci_iounmap(pdev, mmio_base);
+err_out_free_ent:
+	kfree(probe_ent);
+err_out_regions:
+	pci_release_regions(pdev);
+err_out:
+	if (!pci_dev_busy)
+		pci_disable_device(pdev);
+	return rc;
+}
+
+
+static int __init pdc_sata_init(void)
+{
+	return pci_register_driver(&pdc_sata_pci_driver);
+}
+
+
+static void __exit pdc_sata_exit(void)
+{
+	pci_unregister_driver(&pdc_sata_pci_driver);
+}
+
+
+MODULE_AUTHOR("Jeff Garzik");
+MODULE_DESCRIPTION("Promise SATA low-level driver");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, pdc_sata_pci_tbl);
+MODULE_VERSION(DRV_VERSION);
+
+module_init(pdc_sata_init);
+module_exit(pdc_sata_exit);
diff --git a/drivers/ata/sata_uli.c b/drivers/ata/sata_uli.c
new file mode 100644
index 0000000..654aae2
--- /dev/null
+++ b/drivers/ata/sata_uli.c
@@ -0,0 +1,300 @@
+/*
+ *  sata_uli.c - ULi Electronics SATA
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ *  libata documentation is available via 'make {ps|pdf}docs',
+ *  as Documentation/DocBook/libata.*
+ *
+ *  Hardware documentation available under NDA.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+
+#define DRV_NAME	"sata_uli"
+#define DRV_VERSION	"1.0"
+
+enum {
+	uli_5289		= 0,
+	uli_5287		= 1,
+	uli_5281		= 2,
+
+	uli_max_ports		= 4,
+
+	/* PCI configuration registers */
+	ULI5287_BASE		= 0x90, /* sata0 phy SCR registers */
+	ULI5287_OFFS		= 0x10, /* offset from sata0->sata1 phy regs */
+	ULI5281_BASE		= 0x60, /* sata0 phy SCR  registers */
+	ULI5281_OFFS		= 0x60, /* offset from sata0->sata1 phy regs */
+};
+
+struct uli_priv {
+	unsigned int		scr_cfg_addr[uli_max_ports];
+};
+
+static int uli_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
+static u32 uli_scr_read (struct ata_port *ap, unsigned int sc_reg);
+static void uli_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val);
+
+static const struct pci_device_id uli_pci_tbl[] = {
+	{ PCI_VENDOR_ID_AL, 0x5289, PCI_ANY_ID, PCI_ANY_ID, 0, 0, uli_5289 },
+	{ PCI_VENDOR_ID_AL, 0x5287, PCI_ANY_ID, PCI_ANY_ID, 0, 0, uli_5287 },
+	{ PCI_VENDOR_ID_AL, 0x5281, PCI_ANY_ID, PCI_ANY_ID, 0, 0, uli_5281 },
+	{ }	/* terminate list */
+};
+
+
+static struct pci_driver uli_pci_driver = {
+	.name			= DRV_NAME,
+	.id_table		= uli_pci_tbl,
+	.probe			= uli_init_one,
+	.remove			= ata_pci_remove_one,
+};
+
+static struct scsi_host_template uli_sht = {
+	.module			= THIS_MODULE,
+	.name			= DRV_NAME,
+	.ioctl			= ata_scsi_ioctl,
+	.queuecommand		= ata_scsi_queuecmd,
+	.can_queue		= ATA_DEF_QUEUE,
+	.this_id		= ATA_SHT_THIS_ID,
+	.sg_tablesize		= LIBATA_MAX_PRD,
+	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
+	.emulated		= ATA_SHT_EMULATED,
+	.use_clustering		= ATA_SHT_USE_CLUSTERING,
+	.proc_name		= DRV_NAME,
+	.dma_boundary		= ATA_DMA_BOUNDARY,
+	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
+	.bios_param		= ata_std_bios_param,
+};
+
+static const struct ata_port_operations uli_ops = {
+	.port_disable		= ata_port_disable,
+
+	.tf_load		= ata_tf_load,
+	.tf_read		= ata_tf_read,
+	.check_status		= ata_check_status,
+	.exec_command		= ata_exec_command,
+	.dev_select		= ata_std_dev_select,
+
+	.bmdma_setup            = ata_bmdma_setup,
+	.bmdma_start            = ata_bmdma_start,
+	.bmdma_stop		= ata_bmdma_stop,
+	.bmdma_status		= ata_bmdma_status,
+	.qc_prep		= ata_qc_prep,
+	.qc_issue		= ata_qc_issue_prot,
+	.data_xfer		= ata_pio_data_xfer,
+
+	.freeze			= ata_bmdma_freeze,
+	.thaw			= ata_bmdma_thaw,
+	.error_handler		= ata_bmdma_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
+
+	.irq_handler		= ata_interrupt,
+	.irq_clear		= ata_bmdma_irq_clear,
+
+	.scr_read		= uli_scr_read,
+	.scr_write		= uli_scr_write,
+
+	.port_start		= ata_port_start,
+	.port_stop		= ata_port_stop,
+	.host_stop		= ata_host_stop,
+};
+
+static struct ata_port_info uli_port_info = {
+	.sht            = &uli_sht,
+	.host_flags     = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY,
+	.pio_mask       = 0x1f,		/* pio0-4 */
+	.udma_mask      = 0x7f,		/* udma0-6 */
+	.port_ops       = &uli_ops,
+};
+
+
+MODULE_AUTHOR("Peer Chen");
+MODULE_DESCRIPTION("low-level driver for ULi Electronics SATA controller");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, uli_pci_tbl);
+MODULE_VERSION(DRV_VERSION);
+
+static unsigned int get_scr_cfg_addr(struct ata_port *ap, unsigned int sc_reg)
+{
+	struct uli_priv *hpriv = ap->host_set->private_data;
+	return hpriv->scr_cfg_addr[ap->port_no] + (4 * sc_reg);
+}
+
+static u32 uli_scr_cfg_read (struct ata_port *ap, unsigned int sc_reg)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host_set->dev);
+	unsigned int cfg_addr = get_scr_cfg_addr(ap, sc_reg);
+	u32 val;
+
+	pci_read_config_dword(pdev, cfg_addr, &val);
+	return val;
+}
+
+static void uli_scr_cfg_write (struct ata_port *ap, unsigned int scr, u32 val)
+{
+	struct pci_dev *pdev = to_pci_dev(ap->host_set->dev);
+	unsigned int cfg_addr = get_scr_cfg_addr(ap, scr);
+
+	pci_write_config_dword(pdev, cfg_addr, val);
+}
+
+static u32 uli_scr_read (struct ata_port *ap, unsigned int sc_reg)
+{
+	if (sc_reg > SCR_CONTROL)
+		return 0xffffffffU;
+
+	return uli_scr_cfg_read(ap, sc_reg);
+}
+
+static void uli_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val)
+{
+	if (sc_reg > SCR_CONTROL)	//SCR_CONTROL=2, SCR_ERROR=1, SCR_STATUS=0
+		return;
+
+	uli_scr_cfg_write(ap, sc_reg, val);
+}
+
+static int uli_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	static int printed_version;
+	struct ata_probe_ent *probe_ent;
+	struct ata_port_info *ppi;
+	int rc;
+	unsigned int board_idx = (unsigned int) ent->driver_data;
+	int pci_dev_busy = 0;
+	struct uli_priv *hpriv;
+
+	if (!printed_version++)
+		dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n");
+
+	rc = pci_enable_device(pdev);
+	if (rc)
+		return rc;
+
+	rc = pci_request_regions(pdev, DRV_NAME);
+	if (rc) {
+		pci_dev_busy = 1;
+		goto err_out;
+	}
+
+	rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
+	if (rc)
+		goto err_out_regions;
+	rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
+	if (rc)
+		goto err_out_regions;
+
+	ppi = &uli_port_info;
+	probe_ent = ata_pci_init_native_mode(pdev, &ppi, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
+	if (!probe_ent) {
+		rc = -ENOMEM;
+		goto err_out_regions;
+	}
+
+	hpriv = kzalloc(sizeof(*hpriv), GFP_KERNEL);
+	if (!hpriv) {
+		rc = -ENOMEM;
+		goto err_out_probe_ent;
+	}
+
+	probe_ent->private_data = hpriv;
+
+	switch (board_idx) {
+	case uli_5287:
+		hpriv->scr_cfg_addr[0] = ULI5287_BASE;
+		hpriv->scr_cfg_addr[1] = ULI5287_BASE + ULI5287_OFFS;
+       		probe_ent->n_ports = 4;
+
+       		probe_ent->port[2].cmd_addr = pci_resource_start(pdev, 0) + 8;
+		probe_ent->port[2].altstatus_addr =
+		probe_ent->port[2].ctl_addr =
+			(pci_resource_start(pdev, 1) | ATA_PCI_CTL_OFS) + 4;
+		probe_ent->port[2].bmdma_addr = pci_resource_start(pdev, 4) + 16;
+		hpriv->scr_cfg_addr[2] = ULI5287_BASE + ULI5287_OFFS*4;
+
+		probe_ent->port[3].cmd_addr = pci_resource_start(pdev, 2) + 8;
+		probe_ent->port[3].altstatus_addr =
+		probe_ent->port[3].ctl_addr =
+			(pci_resource_start(pdev, 3) | ATA_PCI_CTL_OFS) + 4;
+		probe_ent->port[3].bmdma_addr = pci_resource_start(pdev, 4) + 24;
+		hpriv->scr_cfg_addr[3] = ULI5287_BASE + ULI5287_OFFS*5;
+
+		ata_std_ports(&probe_ent->port[2]);
+		ata_std_ports(&probe_ent->port[3]);
+		break;
+
+	case uli_5289:
+		hpriv->scr_cfg_addr[0] = ULI5287_BASE;
+		hpriv->scr_cfg_addr[1] = ULI5287_BASE + ULI5287_OFFS;
+		break;
+
+	case uli_5281:
+		hpriv->scr_cfg_addr[0] = ULI5281_BASE;
+		hpriv->scr_cfg_addr[1] = ULI5281_BASE + ULI5281_OFFS;
+		break;
+
+	default:
+		BUG();
+		break;
+	}
+
+	pci_set_master(pdev);
+	pci_intx(pdev, 1);
+
+	/* FIXME: check ata_device_add return value */
+	ata_device_add(probe_ent);
+	kfree(probe_ent);
+
+	return 0;
+
+err_out_probe_ent:
+	kfree(probe_ent);
+err_out_regions:
+	pci_release_regions(pdev);
+err_out:
+	if (!pci_dev_busy)
+		pci_disable_device(pdev);
+	return rc;
+
+}
+
+static int __init uli_init(void)
+{
+	return pci_register_driver(&uli_pci_driver);
+}
+
+static void __exit uli_exit(void)
+{
+	pci_unregister_driver(&uli_pci_driver);
+}
+
+
+module_init(uli_init);
+module_exit(uli_exit);
diff --git a/drivers/ata/sata_via.c b/drivers/ata/sata_via.c
new file mode 100644
index 0000000..0bf1dbe
--- /dev/null
+++ b/drivers/ata/sata_via.c
@@ -0,0 +1,394 @@
+/*
+ *  sata_via.c - VIA Serial ATA controllers
+ *
+ *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
+ * 		   Please ALWAYS copy linux-ide@vger.kernel.org
+ 		   on emails.
+ *
+ *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
+ *  Copyright 2003-2004 Jeff Garzik
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ *  libata documentation is available via 'make {ps|pdf}docs',
+ *  as Documentation/DocBook/libata.*
+ *
+ *  Hardware documentation available under NDA.
+ *
+ *
+ *  To-do list:
+ *  - VT6421 PATA support
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+#include <asm/io.h>
+
+#define DRV_NAME	"sata_via"
+#define DRV_VERSION	"2.0"
+
+enum board_ids_enum {
+	vt6420,
+	vt6421,
+};
+
+enum {
+	SATA_CHAN_ENAB		= 0x40, /* SATA channel enable */
+	SATA_INT_GATE		= 0x41, /* SATA interrupt gating */
+	SATA_NATIVE_MODE	= 0x42, /* Native mode enable */
+	SATA_PATA_SHARING	= 0x49, /* PATA/SATA sharing func ctrl */
+
+	PORT0			= (1 << 1),
+	PORT1			= (1 << 0),
+	ALL_PORTS		= PORT0 | PORT1,
+	N_PORTS			= 2,
+
+	NATIVE_MODE_ALL		= (1 << 7) | (1 << 6) | (1 << 5) | (1 << 4),
+
+	SATA_EXT_PHY		= (1 << 6), /* 0==use PATA, 1==ext phy */
+	SATA_2DEV		= (1 << 5), /* SATA is master/slave */
+};
+
+static int svia_init_one (struct pci_dev *pdev, const struct pci_device_id *ent);
+static u32 svia_scr_read (struct ata_port *ap, unsigned int sc_reg);
+static void svia_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val);
+
+static const struct pci_device_id svia_pci_tbl[] = {
+	{ 0x1106, 0x3149, PCI_ANY_ID, PCI_ANY_ID, 0, 0, vt6420 },
+	{ 0x1106, 0x3249, PCI_ANY_ID, PCI_ANY_ID, 0, 0, vt6421 },
+
+	{ }	/* terminate list */
+};
+
+static struct pci_driver svia_pci_driver = {
+	.name			= DRV_NAME,
+	.id_table		= svia_pci_tbl,
+	.probe			= svia_init_one,
+	.remove			= ata_pci_remove_one,
+};
+
+static struct scsi_host_template svia_sht = {
+	.module			= THIS_MODULE,
+	.name			= DRV_NAME,
+	.ioctl			= ata_scsi_ioctl,
+	.queuecommand		= ata_scsi_queuecmd,
+	.can_queue		= ATA_DEF_QUEUE,
+	.this_id		= ATA_SHT_THIS_ID,
+	.sg_tablesize		= LIBATA_MAX_PRD,
+	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
+	.emulated		= ATA_SHT_EMULATED,
+	.use_clustering		= ATA_SHT_USE_CLUSTERING,
+	.proc_name		= DRV_NAME,
+	.dma_boundary		= ATA_DMA_BOUNDARY,
+	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
+	.bios_param		= ata_std_bios_param,
+};
+
+static const struct ata_port_operations svia_sata_ops = {
+	.port_disable		= ata_port_disable,
+
+	.tf_load		= ata_tf_load,
+	.tf_read		= ata_tf_read,
+	.check_status		= ata_check_status,
+	.exec_command		= ata_exec_command,
+	.dev_select		= ata_std_dev_select,
+
+	.bmdma_setup            = ata_bmdma_setup,
+	.bmdma_start            = ata_bmdma_start,
+	.bmdma_stop		= ata_bmdma_stop,
+	.bmdma_status		= ata_bmdma_status,
+
+	.qc_prep		= ata_qc_prep,
+	.qc_issue		= ata_qc_issue_prot,
+	.data_xfer		= ata_pio_data_xfer,
+
+	.freeze			= ata_bmdma_freeze,
+	.thaw			= ata_bmdma_thaw,
+	.error_handler		= ata_bmdma_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
+
+	.irq_handler		= ata_interrupt,
+	.irq_clear		= ata_bmdma_irq_clear,
+
+	.scr_read		= svia_scr_read,
+	.scr_write		= svia_scr_write,
+
+	.port_start		= ata_port_start,
+	.port_stop		= ata_port_stop,
+	.host_stop		= ata_host_stop,
+};
+
+static struct ata_port_info svia_port_info = {
+	.sht		= &svia_sht,
+	.host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY,
+	.pio_mask	= 0x1f,
+	.mwdma_mask	= 0x07,
+	.udma_mask	= 0x7f,
+	.port_ops	= &svia_sata_ops,
+};
+
+MODULE_AUTHOR("Jeff Garzik");
+MODULE_DESCRIPTION("SCSI low-level driver for VIA SATA controllers");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, svia_pci_tbl);
+MODULE_VERSION(DRV_VERSION);
+
+static u32 svia_scr_read (struct ata_port *ap, unsigned int sc_reg)
+{
+	if (sc_reg > SCR_CONTROL)
+		return 0xffffffffU;
+	return inl(ap->ioaddr.scr_addr + (4 * sc_reg));
+}
+
+static void svia_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val)
+{
+	if (sc_reg > SCR_CONTROL)
+		return;
+	outl(val, ap->ioaddr.scr_addr + (4 * sc_reg));
+}
+
+static const unsigned int svia_bar_sizes[] = {
+	8, 4, 8, 4, 16, 256
+};
+
+static const unsigned int vt6421_bar_sizes[] = {
+	16, 16, 16, 16, 32, 128
+};
+
+static unsigned long svia_scr_addr(unsigned long addr, unsigned int port)
+{
+	return addr + (port * 128);
+}
+
+static unsigned long vt6421_scr_addr(unsigned long addr, unsigned int port)
+{
+	return addr + (port * 64);
+}
+
+static void vt6421_init_addrs(struct ata_probe_ent *probe_ent,
+			      struct pci_dev *pdev,
+			      unsigned int port)
+{
+	unsigned long reg_addr = pci_resource_start(pdev, port);
+	unsigned long bmdma_addr = pci_resource_start(pdev, 4) + (port * 8);
+	unsigned long scr_addr;
+
+	probe_ent->port[port].cmd_addr = reg_addr;
+	probe_ent->port[port].altstatus_addr =
+	probe_ent->port[port].ctl_addr = (reg_addr + 8) | ATA_PCI_CTL_OFS;
+	probe_ent->port[port].bmdma_addr = bmdma_addr;
+
+	scr_addr = vt6421_scr_addr(pci_resource_start(pdev, 5), port);
+	probe_ent->port[port].scr_addr = scr_addr;
+
+	ata_std_ports(&probe_ent->port[port]);
+}
+
+static struct ata_probe_ent *vt6420_init_probe_ent(struct pci_dev *pdev)
+{
+	struct ata_probe_ent *probe_ent;
+	struct ata_port_info *ppi = &svia_port_info;
+
+	probe_ent = ata_pci_init_native_mode(pdev, &ppi, ATA_PORT_PRIMARY | ATA_PORT_SECONDARY);
+	if (!probe_ent)
+		return NULL;
+
+	probe_ent->port[0].scr_addr =
+		svia_scr_addr(pci_resource_start(pdev, 5), 0);
+	probe_ent->port[1].scr_addr =
+		svia_scr_addr(pci_resource_start(pdev, 5), 1);
+
+	return probe_ent;
+}
+
+static struct ata_probe_ent *vt6421_init_probe_ent(struct pci_dev *pdev)
+{
+	struct ata_probe_ent *probe_ent;
+	unsigned int i;
+
+	probe_ent = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
+	if (!probe_ent)
+		return NULL;
+
+	memset(probe_ent, 0, sizeof(*probe_ent));
+	probe_ent->dev = pci_dev_to_dev(pdev);
+	INIT_LIST_HEAD(&probe_ent->node);
+
+	probe_ent->sht		= &svia_sht;
+	probe_ent->host_flags	= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY;
+	probe_ent->port_ops	= &svia_sata_ops;
+	probe_ent->n_ports	= N_PORTS;
+	probe_ent->irq		= pdev->irq;
+	probe_ent->irq_flags	= IRQF_SHARED;
+	probe_ent->pio_mask	= 0x1f;
+	probe_ent->mwdma_mask	= 0x07;
+	probe_ent->udma_mask	= 0x7f;
+
+	for (i = 0; i < N_PORTS; i++)
+		vt6421_init_addrs(probe_ent, pdev, i);
+
+	return probe_ent;
+}
+
+static void svia_configure(struct pci_dev *pdev)
+{
+	u8 tmp8;
+
+	pci_read_config_byte(pdev, PCI_INTERRUPT_LINE, &tmp8);
+	dev_printk(KERN_INFO, &pdev->dev, "routed to hard irq line %d\n",
+	       (int) (tmp8 & 0xf0) == 0xf0 ? 0 : tmp8 & 0x0f);
+
+	/* make sure SATA channels are enabled */
+	pci_read_config_byte(pdev, SATA_CHAN_ENAB, &tmp8);
+	if ((tmp8 & ALL_PORTS) != ALL_PORTS) {
+		dev_printk(KERN_DEBUG, &pdev->dev,
+			   "enabling SATA channels (0x%x)\n",
+		           (int) tmp8);
+		tmp8 |= ALL_PORTS;
+		pci_write_config_byte(pdev, SATA_CHAN_ENAB, tmp8);
+	}
+
+	/* make sure interrupts for each channel sent to us */
+	pci_read_config_byte(pdev, SATA_INT_GATE, &tmp8);
+	if ((tmp8 & ALL_PORTS) != ALL_PORTS) {
+		dev_printk(KERN_DEBUG, &pdev->dev,
+			   "enabling SATA channel interrupts (0x%x)\n",
+		           (int) tmp8);
+		tmp8 |= ALL_PORTS;
+		pci_write_config_byte(pdev, SATA_INT_GATE, tmp8);
+	}
+
+	/* make sure native mode is enabled */
+	pci_read_config_byte(pdev, SATA_NATIVE_MODE, &tmp8);
+	if ((tmp8 & NATIVE_MODE_ALL) != NATIVE_MODE_ALL) {
+		dev_printk(KERN_DEBUG, &pdev->dev,
+			   "enabling SATA channel native mode (0x%x)\n",
+		           (int) tmp8);
+		tmp8 |= NATIVE_MODE_ALL;
+		pci_write_config_byte(pdev, SATA_NATIVE_MODE, tmp8);
+	}
+}
+
+static int svia_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	static int printed_version;
+	unsigned int i;
+	int rc;
+	struct ata_probe_ent *probe_ent;
+	int board_id = (int) ent->driver_data;
+	const int *bar_sizes;
+	int pci_dev_busy = 0;
+	u8 tmp8;
+
+	if (!printed_version++)
+		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
+
+	rc = pci_enable_device(pdev);
+	if (rc)
+		return rc;
+
+	rc = pci_request_regions(pdev, DRV_NAME);
+	if (rc) {
+		pci_dev_busy = 1;
+		goto err_out;
+	}
+
+	if (board_id == vt6420) {
+		pci_read_config_byte(pdev, SATA_PATA_SHARING, &tmp8);
+		if (tmp8 & SATA_2DEV) {
+			dev_printk(KERN_ERR, &pdev->dev,
+				   "SATA master/slave not supported (0x%x)\n",
+		       		   (int) tmp8);
+			rc = -EIO;
+			goto err_out_regions;
+		}
+
+		bar_sizes = &svia_bar_sizes[0];
+	} else {
+		bar_sizes = &vt6421_bar_sizes[0];
+	}
+
+	for (i = 0; i < ARRAY_SIZE(svia_bar_sizes); i++)
+		if ((pci_resource_start(pdev, i) == 0) ||
+		    (pci_resource_len(pdev, i) < bar_sizes[i])) {
+			dev_printk(KERN_ERR, &pdev->dev,
+				"invalid PCI BAR %u (sz 0x%llx, val 0x%llx)\n",
+				i,
+			        (unsigned long long)pci_resource_start(pdev, i),
+			        (unsigned long long)pci_resource_len(pdev, i));
+			rc = -ENODEV;
+			goto err_out_regions;
+		}
+
+	rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
+	if (rc)
+		goto err_out_regions;
+	rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
+	if (rc)
+		goto err_out_regions;
+
+	if (board_id == vt6420)
+		probe_ent = vt6420_init_probe_ent(pdev);
+	else
+		probe_ent = vt6421_init_probe_ent(pdev);
+
+	if (!probe_ent) {
+		dev_printk(KERN_ERR, &pdev->dev, "out of memory\n");
+		rc = -ENOMEM;
+		goto err_out_regions;
+	}
+
+	svia_configure(pdev);
+
+	pci_set_master(pdev);
+
+	/* FIXME: check ata_device_add return value */
+	ata_device_add(probe_ent);
+	kfree(probe_ent);
+
+	return 0;
+
+err_out_regions:
+	pci_release_regions(pdev);
+err_out:
+	if (!pci_dev_busy)
+		pci_disable_device(pdev);
+	return rc;
+}
+
+static int __init svia_init(void)
+{
+	return pci_register_driver(&svia_pci_driver);
+}
+
+static void __exit svia_exit(void)
+{
+	pci_unregister_driver(&svia_pci_driver);
+}
+
+module_init(svia_init);
+module_exit(svia_exit);
+
diff --git a/drivers/ata/sata_vsc.c b/drivers/ata/sata_vsc.c
new file mode 100644
index 0000000..4c69a70
--- /dev/null
+++ b/drivers/ata/sata_vsc.c
@@ -0,0 +1,482 @@
+/*
+ *  sata_vsc.c - Vitesse VSC7174 4 port DPA SATA
+ *
+ *  Maintained by:  Jeremy Higdon @ SGI
+ * 		    Please ALWAYS copy linux-ide@vger.kernel.org
+ *		    on emails.
+ *
+ *  Copyright 2004 SGI
+ *
+ *  Bits from Jeff Garzik, Copyright RedHat, Inc.
+ *
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ *  libata documentation is available via 'make {ps|pdf}docs',
+ *  as Documentation/DocBook/libata.*
+ *
+ *  Vitesse hardware documentation presumably available under NDA.
+ *  Intel 31244 (same hardware interface) documentation presumably
+ *  available from http://developer.intel.com/
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/dma-mapping.h>
+#include <linux/device.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+
+#define DRV_NAME	"sata_vsc"
+#define DRV_VERSION	"2.0"
+
+enum {
+	/* Interrupt register offsets (from chip base address) */
+	VSC_SATA_INT_STAT_OFFSET	= 0x00,
+	VSC_SATA_INT_MASK_OFFSET	= 0x04,
+
+	/* Taskfile registers offsets */
+	VSC_SATA_TF_CMD_OFFSET		= 0x00,
+	VSC_SATA_TF_DATA_OFFSET		= 0x00,
+	VSC_SATA_TF_ERROR_OFFSET	= 0x04,
+	VSC_SATA_TF_FEATURE_OFFSET	= 0x06,
+	VSC_SATA_TF_NSECT_OFFSET	= 0x08,
+	VSC_SATA_TF_LBAL_OFFSET		= 0x0c,
+	VSC_SATA_TF_LBAM_OFFSET		= 0x10,
+	VSC_SATA_TF_LBAH_OFFSET		= 0x14,
+	VSC_SATA_TF_DEVICE_OFFSET	= 0x18,
+	VSC_SATA_TF_STATUS_OFFSET	= 0x1c,
+	VSC_SATA_TF_COMMAND_OFFSET	= 0x1d,
+	VSC_SATA_TF_ALTSTATUS_OFFSET	= 0x28,
+	VSC_SATA_TF_CTL_OFFSET		= 0x29,
+
+	/* DMA base */
+	VSC_SATA_UP_DESCRIPTOR_OFFSET	= 0x64,
+	VSC_SATA_UP_DATA_BUFFER_OFFSET	= 0x6C,
+	VSC_SATA_DMA_CMD_OFFSET		= 0x70,
+
+	/* SCRs base */
+	VSC_SATA_SCR_STATUS_OFFSET	= 0x100,
+	VSC_SATA_SCR_ERROR_OFFSET	= 0x104,
+	VSC_SATA_SCR_CONTROL_OFFSET	= 0x108,
+
+	/* Port stride */
+	VSC_SATA_PORT_OFFSET		= 0x200,
+
+	/* Error interrupt status bit offsets */
+	VSC_SATA_INT_ERROR_CRC		= 0x40,
+	VSC_SATA_INT_ERROR_T		= 0x20,
+	VSC_SATA_INT_ERROR_P		= 0x10,
+	VSC_SATA_INT_ERROR_R		= 0x8,
+	VSC_SATA_INT_ERROR_E		= 0x4,
+	VSC_SATA_INT_ERROR_M		= 0x2,
+	VSC_SATA_INT_PHY_CHANGE		= 0x1,
+	VSC_SATA_INT_ERROR = (VSC_SATA_INT_ERROR_CRC  | VSC_SATA_INT_ERROR_T | \
+			      VSC_SATA_INT_ERROR_P    | VSC_SATA_INT_ERROR_R | \
+			      VSC_SATA_INT_ERROR_E    | VSC_SATA_INT_ERROR_M | \
+			      VSC_SATA_INT_PHY_CHANGE),
+};
+
+
+#define is_vsc_sata_int_err(port_idx, int_status) \
+	 (int_status & (VSC_SATA_INT_ERROR << (8 * port_idx)))
+
+
+static u32 vsc_sata_scr_read (struct ata_port *ap, unsigned int sc_reg)
+{
+	if (sc_reg > SCR_CONTROL)
+		return 0xffffffffU;
+	return readl((void __iomem *) ap->ioaddr.scr_addr + (sc_reg * 4));
+}
+
+
+static void vsc_sata_scr_write (struct ata_port *ap, unsigned int sc_reg,
+			       u32 val)
+{
+	if (sc_reg > SCR_CONTROL)
+		return;
+	writel(val, (void __iomem *) ap->ioaddr.scr_addr + (sc_reg * 4));
+}
+
+
+static void vsc_intr_mask_update(struct ata_port *ap, u8 ctl)
+{
+	void __iomem *mask_addr;
+	u8 mask;
+
+	mask_addr = ap->host_set->mmio_base +
+		VSC_SATA_INT_MASK_OFFSET + ap->port_no;
+	mask = readb(mask_addr);
+	if (ctl & ATA_NIEN)
+		mask |= 0x80;
+	else
+		mask &= 0x7F;
+	writeb(mask, mask_addr);
+}
+
+
+static void vsc_sata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
+{
+	struct ata_ioports *ioaddr = &ap->ioaddr;
+	unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
+
+	/*
+	 * The only thing the ctl register is used for is SRST.
+	 * That is not enabled or disabled via tf_load.
+	 * However, if ATA_NIEN is changed, then we need to change the interrupt register.
+	 */
+	if ((tf->ctl & ATA_NIEN) != (ap->last_ctl & ATA_NIEN)) {
+		ap->last_ctl = tf->ctl;
+		vsc_intr_mask_update(ap, tf->ctl & ATA_NIEN);
+	}
+	if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
+		writew(tf->feature | (((u16)tf->hob_feature) << 8), ioaddr->feature_addr);
+		writew(tf->nsect | (((u16)tf->hob_nsect) << 8), ioaddr->nsect_addr);
+		writew(tf->lbal | (((u16)tf->hob_lbal) << 8), ioaddr->lbal_addr);
+		writew(tf->lbam | (((u16)tf->hob_lbam) << 8), ioaddr->lbam_addr);
+		writew(tf->lbah | (((u16)tf->hob_lbah) << 8), ioaddr->lbah_addr);
+	} else if (is_addr) {
+		writew(tf->feature, ioaddr->feature_addr);
+		writew(tf->nsect, ioaddr->nsect_addr);
+		writew(tf->lbal, ioaddr->lbal_addr);
+		writew(tf->lbam, ioaddr->lbam_addr);
+		writew(tf->lbah, ioaddr->lbah_addr);
+	}
+
+	if (tf->flags & ATA_TFLAG_DEVICE)
+		writeb(tf->device, ioaddr->device_addr);
+
+	ata_wait_idle(ap);
+}
+
+
+static void vsc_sata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
+{
+	struct ata_ioports *ioaddr = &ap->ioaddr;
+	u16 nsect, lbal, lbam, lbah, feature;
+
+	tf->command = ata_check_status(ap);
+	tf->device = readw(ioaddr->device_addr);
+	feature = readw(ioaddr->error_addr);
+	nsect = readw(ioaddr->nsect_addr);
+	lbal = readw(ioaddr->lbal_addr);
+	lbam = readw(ioaddr->lbam_addr);
+	lbah = readw(ioaddr->lbah_addr);
+
+	tf->feature = feature;
+	tf->nsect = nsect;
+	tf->lbal = lbal;
+	tf->lbam = lbam;
+	tf->lbah = lbah;
+
+	if (tf->flags & ATA_TFLAG_LBA48) {
+		tf->hob_feature = feature >> 8;
+		tf->hob_nsect = nsect >> 8;
+		tf->hob_lbal = lbal >> 8;
+		tf->hob_lbam = lbam >> 8;
+		tf->hob_lbah = lbah >> 8;
+        }
+}
+
+
+/*
+ * vsc_sata_interrupt
+ *
+ * Read the interrupt register and process for the devices that have them pending.
+ */
+static irqreturn_t vsc_sata_interrupt (int irq, void *dev_instance,
+				       struct pt_regs *regs)
+{
+	struct ata_host_set *host_set = dev_instance;
+	unsigned int i;
+	unsigned int handled = 0;
+	u32 int_status;
+
+	spin_lock(&host_set->lock);
+
+	int_status = readl(host_set->mmio_base + VSC_SATA_INT_STAT_OFFSET);
+
+	for (i = 0; i < host_set->n_ports; i++) {
+		if (int_status & ((u32) 0xFF << (8 * i))) {
+			struct ata_port *ap;
+
+			ap = host_set->ports[i];
+
+			if (is_vsc_sata_int_err(i, int_status)) {
+				u32 err_status;
+				printk(KERN_DEBUG "%s: ignoring interrupt(s)\n", __FUNCTION__);
+				err_status = ap ? vsc_sata_scr_read(ap, SCR_ERROR) : 0;
+				vsc_sata_scr_write(ap, SCR_ERROR, err_status);
+				handled++;
+			}
+
+			if (ap && !(ap->flags & ATA_FLAG_DISABLED)) {
+				struct ata_queued_cmd *qc;
+
+				qc = ata_qc_from_tag(ap, ap->active_tag);
+				if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)))
+					handled += ata_host_intr(ap, qc);
+				else if (is_vsc_sata_int_err(i, int_status)) {
+					/*
+					 * On some chips (i.e. Intel 31244), an error
+					 * interrupt will sneak in at initialization
+					 * time (phy state changes).  Clearing the SCR
+					 * error register is not required, but it prevents
+					 * the phy state change interrupts from recurring
+					 * later.
+					 */
+					u32 err_status;
+					err_status = vsc_sata_scr_read(ap, SCR_ERROR);
+					printk(KERN_DEBUG "%s: clearing interrupt, "
+					       "status %x; sata err status %x\n",
+					       __FUNCTION__,
+					       int_status, err_status);
+					vsc_sata_scr_write(ap, SCR_ERROR, err_status);
+					/* Clear interrupt status */
+					ata_chk_status(ap);
+					handled++;
+				}
+			}
+		}
+	}
+
+	spin_unlock(&host_set->lock);
+
+	return IRQ_RETVAL(handled);
+}
+
+
+static struct scsi_host_template vsc_sata_sht = {
+	.module			= THIS_MODULE,
+	.name			= DRV_NAME,
+	.ioctl			= ata_scsi_ioctl,
+	.queuecommand		= ata_scsi_queuecmd,
+	.can_queue		= ATA_DEF_QUEUE,
+	.this_id		= ATA_SHT_THIS_ID,
+	.sg_tablesize		= LIBATA_MAX_PRD,
+	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
+	.emulated		= ATA_SHT_EMULATED,
+	.use_clustering		= ATA_SHT_USE_CLUSTERING,
+	.proc_name		= DRV_NAME,
+	.dma_boundary		= ATA_DMA_BOUNDARY,
+	.slave_configure	= ata_scsi_slave_config,
+	.slave_destroy		= ata_scsi_slave_destroy,
+	.bios_param		= ata_std_bios_param,
+};
+
+
+static const struct ata_port_operations vsc_sata_ops = {
+	.port_disable		= ata_port_disable,
+	.tf_load		= vsc_sata_tf_load,
+	.tf_read		= vsc_sata_tf_read,
+	.exec_command		= ata_exec_command,
+	.check_status		= ata_check_status,
+	.dev_select		= ata_std_dev_select,
+	.bmdma_setup            = ata_bmdma_setup,
+	.bmdma_start            = ata_bmdma_start,
+	.bmdma_stop		= ata_bmdma_stop,
+	.bmdma_status		= ata_bmdma_status,
+	.qc_prep		= ata_qc_prep,
+	.qc_issue		= ata_qc_issue_prot,
+	.data_xfer		= ata_mmio_data_xfer,
+	.freeze			= ata_bmdma_freeze,
+	.thaw			= ata_bmdma_thaw,
+	.error_handler		= ata_bmdma_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
+	.irq_handler		= vsc_sata_interrupt,
+	.irq_clear		= ata_bmdma_irq_clear,
+	.scr_read		= vsc_sata_scr_read,
+	.scr_write		= vsc_sata_scr_write,
+	.port_start		= ata_port_start,
+	.port_stop		= ata_port_stop,
+	.host_stop		= ata_pci_host_stop,
+};
+
+static void __devinit vsc_sata_setup_port(struct ata_ioports *port, unsigned long base)
+{
+	port->cmd_addr		= base + VSC_SATA_TF_CMD_OFFSET;
+	port->data_addr		= base + VSC_SATA_TF_DATA_OFFSET;
+	port->error_addr	= base + VSC_SATA_TF_ERROR_OFFSET;
+	port->feature_addr	= base + VSC_SATA_TF_FEATURE_OFFSET;
+	port->nsect_addr	= base + VSC_SATA_TF_NSECT_OFFSET;
+	port->lbal_addr		= base + VSC_SATA_TF_LBAL_OFFSET;
+	port->lbam_addr		= base + VSC_SATA_TF_LBAM_OFFSET;
+	port->lbah_addr		= base + VSC_SATA_TF_LBAH_OFFSET;
+	port->device_addr	= base + VSC_SATA_TF_DEVICE_OFFSET;
+	port->status_addr	= base + VSC_SATA_TF_STATUS_OFFSET;
+	port->command_addr	= base + VSC_SATA_TF_COMMAND_OFFSET;
+	port->altstatus_addr	= base + VSC_SATA_TF_ALTSTATUS_OFFSET;
+	port->ctl_addr		= base + VSC_SATA_TF_CTL_OFFSET;
+	port->bmdma_addr	= base + VSC_SATA_DMA_CMD_OFFSET;
+	port->scr_addr		= base + VSC_SATA_SCR_STATUS_OFFSET;
+	writel(0, base + VSC_SATA_UP_DESCRIPTOR_OFFSET);
+	writel(0, base + VSC_SATA_UP_DATA_BUFFER_OFFSET);
+}
+
+
+static int __devinit vsc_sata_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	static int printed_version;
+	struct ata_probe_ent *probe_ent = NULL;
+	unsigned long base;
+	int pci_dev_busy = 0;
+	void __iomem *mmio_base;
+	int rc;
+
+	if (!printed_version++)
+		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
+
+	rc = pci_enable_device(pdev);
+	if (rc)
+		return rc;
+
+	/*
+	 * Check if we have needed resource mapped.
+	 */
+	if (pci_resource_len(pdev, 0) == 0) {
+		rc = -ENODEV;
+		goto err_out;
+	}
+
+	rc = pci_request_regions(pdev, DRV_NAME);
+	if (rc) {
+		pci_dev_busy = 1;
+		goto err_out;
+	}
+
+	/*
+	 * Use 32 bit DMA mask, because 64 bit address support is poor.
+	 */
+	rc = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
+	if (rc)
+		goto err_out_regions;
+	rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
+	if (rc)
+		goto err_out_regions;
+
+	probe_ent = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
+	if (probe_ent == NULL) {
+		rc = -ENOMEM;
+		goto err_out_regions;
+	}
+	memset(probe_ent, 0, sizeof(*probe_ent));
+	probe_ent->dev = pci_dev_to_dev(pdev);
+	INIT_LIST_HEAD(&probe_ent->node);
+
+	mmio_base = pci_iomap(pdev, 0, 0);
+	if (mmio_base == NULL) {
+		rc = -ENOMEM;
+		goto err_out_free_ent;
+	}
+	base = (unsigned long) mmio_base;
+
+	/*
+	 * Due to a bug in the chip, the default cache line size can't be used
+	 */
+	pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, 0x80);
+
+	probe_ent->sht = &vsc_sata_sht;
+	probe_ent->host_flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
+				ATA_FLAG_MMIO;
+	probe_ent->port_ops = &vsc_sata_ops;
+	probe_ent->n_ports = 4;
+	probe_ent->irq = pdev->irq;
+	probe_ent->irq_flags = IRQF_SHARED;
+	probe_ent->mmio_base = mmio_base;
+
+	/* We don't care much about the PIO/UDMA masks, but the core won't like us
+	 * if we don't fill these
+	 */
+	probe_ent->pio_mask = 0x1f;
+	probe_ent->mwdma_mask = 0x07;
+	probe_ent->udma_mask = 0x7f;
+
+	/* We have 4 ports per PCI function */
+	vsc_sata_setup_port(&probe_ent->port[0], base + 1 * VSC_SATA_PORT_OFFSET);
+	vsc_sata_setup_port(&probe_ent->port[1], base + 2 * VSC_SATA_PORT_OFFSET);
+	vsc_sata_setup_port(&probe_ent->port[2], base + 3 * VSC_SATA_PORT_OFFSET);
+	vsc_sata_setup_port(&probe_ent->port[3], base + 4 * VSC_SATA_PORT_OFFSET);
+
+	pci_set_master(pdev);
+
+	/*
+	 * Config offset 0x98 is "Extended Control and Status Register 0"
+	 * Default value is (1 << 28).  All bits except bit 28 are reserved in
+	 * DPA mode.  If bit 28 is set, LED 0 reflects all ports' activity.
+	 * If bit 28 is clear, each port has its own LED.
+	 */
+	pci_write_config_dword(pdev, 0x98, 0);
+
+	/* FIXME: check ata_device_add return value */
+	ata_device_add(probe_ent);
+	kfree(probe_ent);
+
+	return 0;
+
+err_out_free_ent:
+	kfree(probe_ent);
+err_out_regions:
+	pci_release_regions(pdev);
+err_out:
+	if (!pci_dev_busy)
+		pci_disable_device(pdev);
+	return rc;
+}
+
+
+static const struct pci_device_id vsc_sata_pci_tbl[] = {
+	{ PCI_VENDOR_ID_VITESSE, 0x7174,
+	  PCI_ANY_ID, PCI_ANY_ID, 0x10600, 0xFFFFFF, 0 },
+	{ PCI_VENDOR_ID_INTEL, 0x3200,
+	  PCI_ANY_ID, PCI_ANY_ID, 0x10600, 0xFFFFFF, 0 },
+	{ }	/* terminate list */
+};
+
+
+static struct pci_driver vsc_sata_pci_driver = {
+	.name			= DRV_NAME,
+	.id_table		= vsc_sata_pci_tbl,
+	.probe			= vsc_sata_init_one,
+	.remove			= ata_pci_remove_one,
+};
+
+
+static int __init vsc_sata_init(void)
+{
+	return pci_register_driver(&vsc_sata_pci_driver);
+}
+
+
+static void __exit vsc_sata_exit(void)
+{
+	pci_unregister_driver(&vsc_sata_pci_driver);
+}
+
+
+MODULE_AUTHOR("Jeremy Higdon");
+MODULE_DESCRIPTION("low-level driver for Vitesse VSC7174 SATA controller");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, vsc_sata_pci_tbl);
+MODULE_VERSION(DRV_VERSION);
+
+module_init(vsc_sata_init);
+module_exit(vsc_sata_exit);