Device tree aware EMAC driver

Based on BenH's earlier work, this is a new version of the EMAC driver
for the built-in ethernet found on PowerPC 4xx embedded CPUs.  The
same ASIC is also found in the Axon bridge chip.  This new version is
designed to work in the arch/powerpc tree, using the device tree to
probe the device, rather than the old and ugly arch/ppc OCP layer.

This driver is designed to sit alongside the old driver (that lies in
drivers/net/ibm_emac and this one in drivers/net/ibm_newemac).  The
old driver is left in place to support arch/ppc until arch/ppc itself
reaches its final demise (not too long now, with luck).

This driver still has a number of things that could do with cleaning
up, but I think they can be fixed up after merging.  Specifically:
	- Should be adjusted to properly use the dma mapping API.
Axon needs this.
	- Probe logic needs reworking, in conjuction with the general
probing code for of_platform devices.  The dependencies here between
EMAC, MAL, ZMII etc. make this complicated.  At present, it usually
works, because we initialize and register the sub-drivers before the
EMAC driver itself, and (being in driver code) runs after the devices
themselves have been instantiated from the device tree.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 238 insertions, 0 deletions

diff --git a/drivers/net/ibm_newemac/debug.c b/drivers/net/ibm_newemac/debug.c
new file mode 100644
index 0000000..170524e
--- /dev/null
+++ b/drivers/net/ibm_newemac/debug.c
@@ -0,0 +1,238 @@
+/*
+ * drivers/net/ibm_newemac/debug.c
+ *
+ * Driver for PowerPC 4xx on-chip ethernet controller, debug print routines.
+ *
+ * Copyright (c) 2004, 2005 Zultys Technologies
+ * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
+ *
+ * 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 of the  License, or (at your
+ * option) any later version.
+ *
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/sysrq.h>
+#include <asm/io.h>
+
+#include "core.h"
+
+static spinlock_t emac_dbg_lock = SPIN_LOCK_UNLOCKED;
+
+static void emac_desc_dump(struct emac_instance *p)
+{
+	int i;
+	printk("** EMAC %s TX BDs **\n"
+	       " tx_cnt = %d tx_slot = %d ack_slot = %d\n",
+	       p->ofdev->node->full_name,
+	       p->tx_cnt, p->tx_slot, p->ack_slot);
+	for (i = 0; i < NUM_TX_BUFF / 2; ++i)
+		printk
+		    ("bd[%2d] 0x%08x %c 0x%04x %4u - bd[%2d] 0x%08x %c 0x%04x %4u\n",
+		     i, p->tx_desc[i].data_ptr, p->tx_skb[i] ? 'V' : ' ',
+		     p->tx_desc[i].ctrl, p->tx_desc[i].data_len,
+		     NUM_TX_BUFF / 2 + i,
+		     p->tx_desc[NUM_TX_BUFF / 2 + i].data_ptr,
+		     p->tx_skb[NUM_TX_BUFF / 2 + i] ? 'V' : ' ',
+		     p->tx_desc[NUM_TX_BUFF / 2 + i].ctrl,
+		     p->tx_desc[NUM_TX_BUFF / 2 + i].data_len);
+
+	printk("** EMAC %s RX BDs **\n"
+	       " rx_slot = %d flags = 0x%lx rx_skb_size = %d rx_sync_size = %d\n"
+	       " rx_sg_skb = 0x%p\n",
+	       p->ofdev->node->full_name,
+	       p->rx_slot, p->commac.flags, p->rx_skb_size,
+	       p->rx_sync_size, p->rx_sg_skb);
+	for (i = 0; i < NUM_RX_BUFF / 2; ++i)
+		printk
+		    ("bd[%2d] 0x%08x %c 0x%04x %4u - bd[%2d] 0x%08x %c 0x%04x %4u\n",
+		     i, p->rx_desc[i].data_ptr, p->rx_skb[i] ? 'V' : ' ',
+		     p->rx_desc[i].ctrl, p->rx_desc[i].data_len,
+		     NUM_RX_BUFF / 2 + i,
+		     p->rx_desc[NUM_RX_BUFF / 2 + i].data_ptr,
+		     p->rx_skb[NUM_RX_BUFF / 2 + i] ? 'V' : ' ',
+		     p->rx_desc[NUM_RX_BUFF / 2 + i].ctrl,
+		     p->rx_desc[NUM_RX_BUFF / 2 + i].data_len);
+}
+
+static void emac_mac_dump(struct emac_instance *dev)
+{
+	struct emac_regs __iomem *p = dev->emacp;
+
+	printk("** EMAC %s registers **\n"
+	       "MR0 = 0x%08x MR1 = 0x%08x TMR0 = 0x%08x TMR1 = 0x%08x\n"
+	       "RMR = 0x%08x ISR = 0x%08x ISER = 0x%08x\n"
+	       "IAR = %04x%08x VTPID = 0x%04x VTCI = 0x%04x\n"
+	       "IAHT: 0x%04x 0x%04x 0x%04x 0x%04x "
+	       "GAHT: 0x%04x 0x%04x 0x%04x 0x%04x\n"
+	       "LSA = %04x%08x IPGVR = 0x%04x\n"
+	       "STACR = 0x%08x TRTR = 0x%08x RWMR = 0x%08x\n"
+	       "OCTX = 0x%08x OCRX = 0x%08x IPCR = 0x%08x\n",
+	       dev->ofdev->node->full_name, in_be32(&p->mr0), in_be32(&p->mr1),
+	       in_be32(&p->tmr0), in_be32(&p->tmr1),
+	       in_be32(&p->rmr), in_be32(&p->isr), in_be32(&p->iser),
+	       in_be32(&p->iahr), in_be32(&p->ialr), in_be32(&p->vtpid),
+	       in_be32(&p->vtci),
+	       in_be32(&p->iaht1), in_be32(&p->iaht2), in_be32(&p->iaht3),
+	       in_be32(&p->iaht4),
+	       in_be32(&p->gaht1), in_be32(&p->gaht2), in_be32(&p->gaht3),
+	       in_be32(&p->gaht4),
+	       in_be32(&p->lsah), in_be32(&p->lsal), in_be32(&p->ipgvr),
+	       in_be32(&p->stacr), in_be32(&p->trtr), in_be32(&p->rwmr),
+	       in_be32(&p->octx), in_be32(&p->ocrx), in_be32(&p->ipcr)
+	    );
+
+	emac_desc_dump(dev);
+}
+
+static void emac_mal_dump(struct mal_instance *mal)
+{
+	int i;
+
+	printk("** MAL %s Registers **\n"
+	       "CFG = 0x%08x ESR = 0x%08x IER = 0x%08x\n"
+	       "TX|CASR = 0x%08x CARR = 0x%08x EOBISR = 0x%08x DEIR = 0x%08x\n"
+	       "RX|CASR = 0x%08x CARR = 0x%08x EOBISR = 0x%08x DEIR = 0x%08x\n",
+	       mal->ofdev->node->full_name,
+	       get_mal_dcrn(mal, MAL_CFG), get_mal_dcrn(mal, MAL_ESR),
+	       get_mal_dcrn(mal, MAL_IER),
+	       get_mal_dcrn(mal, MAL_TXCASR), get_mal_dcrn(mal, MAL_TXCARR),
+	       get_mal_dcrn(mal, MAL_TXEOBISR), get_mal_dcrn(mal, MAL_TXDEIR),
+	       get_mal_dcrn(mal, MAL_RXCASR), get_mal_dcrn(mal, MAL_RXCARR),
+	       get_mal_dcrn(mal, MAL_RXEOBISR), get_mal_dcrn(mal, MAL_RXDEIR)
+	    );
+
+	printk("TX|");
+	for (i = 0; i < mal->num_tx_chans; ++i) {
+		if (i && !(i % 4))
+			printk("\n   ");
+		printk("CTP%d = 0x%08x ", i, get_mal_dcrn(mal, MAL_TXCTPR(i)));
+	}
+	printk("\nRX|");
+	for (i = 0; i < mal->num_rx_chans; ++i) {
+		if (i && !(i % 4))
+			printk("\n   ");
+		printk("CTP%d = 0x%08x ", i, get_mal_dcrn(mal, MAL_RXCTPR(i)));
+	}
+	printk("\n   ");
+	for (i = 0; i < mal->num_rx_chans; ++i) {
+		u32 r = get_mal_dcrn(mal, MAL_RCBS(i));
+		if (i && !(i % 3))
+			printk("\n   ");
+		printk("RCBS%d = 0x%08x (%d) ", i, r, r * 16);
+	}
+	printk("\n");
+}
+
+static struct emac_instance *__emacs[4];
+static struct mal_instance *__mals[1];
+
+void emac_dbg_register(struct emac_instance *dev)
+{
+	unsigned long flags;
+	int i;
+
+	spin_lock_irqsave(&emac_dbg_lock, flags);
+	for (i = 0; i < ARRAY_SIZE(__emacs); i++)
+		if (__emacs[i] == NULL) {
+			__emacs[i] = dev;
+			break;
+		}
+	spin_unlock_irqrestore(&emac_dbg_lock, flags);
+}
+
+void emac_dbg_unregister(struct emac_instance *dev)
+{
+	unsigned long flags;
+	int i;
+
+	spin_lock_irqsave(&emac_dbg_lock, flags);
+	for (i = 0; i < ARRAY_SIZE(__emacs); i++)
+		if (__emacs[i] == dev) {
+			__emacs[i] = NULL;
+			break;
+		}
+	spin_unlock_irqrestore(&emac_dbg_lock, flags);
+}
+
+void mal_dbg_register(struct mal_instance *mal)
+{
+	unsigned long flags;
+	int i;
+
+	spin_lock_irqsave(&emac_dbg_lock, flags);
+	for (i = 0; i < ARRAY_SIZE(__mals); i++)
+		if (__mals[i] == NULL) {
+			__mals[i] = mal;
+			break;
+		}
+	spin_unlock_irqrestore(&emac_dbg_lock, flags);
+}
+
+void mal_dbg_unregister(struct mal_instance *mal)
+{
+	unsigned long flags;
+	int i;
+
+	spin_lock_irqsave(&emac_dbg_lock, flags);
+	for (i = 0; i < ARRAY_SIZE(__mals); i++)
+		if (__mals[i] == mal) {
+			__mals[i] = NULL;
+			break;
+		}
+	spin_unlock_irqrestore(&emac_dbg_lock, flags);
+}
+
+void emac_dbg_dump_all(void)
+{
+	unsigned int i;
+	unsigned long flags;
+
+	spin_lock_irqsave(&emac_dbg_lock, flags);
+
+	for (i = 0; i < ARRAY_SIZE(__mals); ++i)
+		if (__mals[i])
+			emac_mal_dump(__mals[i]);
+
+	for (i = 0; i < ARRAY_SIZE(__emacs); ++i)
+		if (__emacs[i])
+			emac_mac_dump(__emacs[i]);
+
+	spin_unlock_irqrestore(&emac_dbg_lock, flags);
+}
+
+#if defined(CONFIG_MAGIC_SYSRQ)
+static void emac_sysrq_handler(int key, struct tty_struct *tty)
+{
+	emac_dbg_dump_all();
+}
+
+static struct sysrq_key_op emac_sysrq_op = {
+	.handler = emac_sysrq_handler,
+	.help_msg = "emaC",
+	.action_msg = "Show EMAC(s) status",
+};
+
+int __init emac_init_debug(void)
+{
+	return register_sysrq_key('c', &emac_sysrq_op);
+}
+
+void __exit emac_fini_debug(void)
+{
+	unregister_sysrq_key('c', &emac_sysrq_op);
+}
+
+#else
+int __init emac_init_debug(void)
+{
+	return 0;
+}
+void __exit emac_fini_debug(void)
+{
+}
+#endif				/* CONFIG_MAGIC_SYSRQ */