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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/scsi/arm/arxescsi.c | |
download | kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/scsi/arm/arxescsi.c')
-rw-r--r-- | drivers/scsi/arm/arxescsi.c | 395 |
1 files changed, 395 insertions, 0 deletions
diff --git a/drivers/scsi/arm/arxescsi.c b/drivers/scsi/arm/arxescsi.c new file mode 100644 index 0000000..29811f5 --- /dev/null +++ b/drivers/scsi/arm/arxescsi.c @@ -0,0 +1,395 @@ +/* + * linux/arch/arm/drivers/scsi/arxescsi.c + * + * Copyright (C) 1997-2000 Russell King, Stefan Hanske + * + * This driver is based on experimentation. Hence, it may have made + * assumptions about the particular card that I have available, and + * may not be reliable! + * + * Changelog: + * 30-08-1997 RMK 0.0.0 Created, READONLY version as cumana_2.c + * 22-01-1998 RMK 0.0.1 Updated to 2.1.80 + * 15-04-1998 RMK 0.0.1 Only do PIO if FAS216 will allow it. + * 11-06-1998 SH 0.0.2 Changed to support ARXE 16-bit SCSI card + * enabled writing + * 01-01-2000 SH 0.1.0 Added *real* pseudo dma writing + * (arxescsi_pseudo_dma_write) + * 02-04-2000 RMK 0.1.1 Updated for new error handling code. + * 22-10-2000 SH Updated for new registering scheme. + */ +#include <linux/module.h> +#include <linux/blkdev.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/ioport.h> +#include <linux/sched.h> +#include <linux/proc_fs.h> +#include <linux/unistd.h> +#include <linux/stat.h> +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/interrupt.h> + +#include <asm/dma.h> +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/ecard.h> + +#include "../scsi.h" +#include <scsi/scsi_host.h> +#include "fas216.h" + +struct arxescsi_info { + FAS216_Info info; + struct expansion_card *ec; + void __iomem *base; +}; + +#define DMADATA_OFFSET (0x200) + +#define DMASTAT_OFFSET (0x600) +#define DMASTAT_DRQ (1 << 0) + +#define CSTATUS_IRQ (1 << 0) + +#define VERSION "1.10 (23/01/2003 2.5.57)" + +/* + * Function: int arxescsi_dma_setup(host, SCpnt, direction, min_type) + * Purpose : initialises DMA/PIO + * Params : host - host + * SCpnt - command + * direction - DMA on to/off of card + * min_type - minimum DMA support that we must have for this transfer + * Returns : 0 if we should not set CMD_WITHDMA for transfer info command + */ +static fasdmatype_t +arxescsi_dma_setup(struct Scsi_Host *host, Scsi_Pointer *SCp, + fasdmadir_t direction, fasdmatype_t min_type) +{ + /* + * We don't do real DMA + */ + return fasdma_pseudo; +} + +static void arxescsi_pseudo_dma_write(unsigned char *addr, void __iomem *base) +{ + __asm__ __volatile__( + " stmdb sp!, {r0-r12}\n" + " mov r3, %0\n" + " mov r1, %1\n" + " add r2, r1, #512\n" + " mov r4, #256\n" + ".loop_1: ldmia r3!, {r6, r8, r10, r12}\n" + " mov r5, r6, lsl #16\n" + " mov r7, r8, lsl #16\n" + ".loop_2: ldrb r0, [r1, #1536]\n" + " tst r0, #1\n" + " beq .loop_2\n" + " stmia r2, {r5-r8}\n\t" + " mov r9, r10, lsl #16\n" + " mov r11, r12, lsl #16\n" + ".loop_3: ldrb r0, [r1, #1536]\n" + " tst r0, #1\n" + " beq .loop_3\n" + " stmia r2, {r9-r12}\n" + " subs r4, r4, #16\n" + " bne .loop_1\n" + " ldmia sp!, {r0-r12}\n" + : + : "r" (addr), "r" (base)); +} + +/* + * Function: int arxescsi_dma_pseudo(host, SCpnt, direction, transfer) + * Purpose : handles pseudo DMA + * Params : host - host + * SCpnt - command + * direction - DMA on to/off of card + * transfer - minimum number of bytes we expect to transfer + */ +static void +arxescsi_dma_pseudo(struct Scsi_Host *host, Scsi_Pointer *SCp, + fasdmadir_t direction, int transfer) +{ + struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata; + unsigned int length, error = 0; + void __iomem *base = info->info.scsi.io_base; + unsigned char *addr; + + length = SCp->this_residual; + addr = SCp->ptr; + + if (direction == DMA_OUT) { + unsigned int word; + while (length > 256) { + if (readb(base + 0x80) & STAT_INT) { + error = 1; + break; + } + arxescsi_pseudo_dma_write(addr, base); + addr += 256; + length -= 256; + } + + if (!error) + while (length > 0) { + if (readb(base + 0x80) & STAT_INT) + break; + + if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ)) + continue; + + word = *addr | *(addr + 1) << 8; + + writew(word, base + DMADATA_OFFSET); + if (length > 1) { + addr += 2; + length -= 2; + } else { + addr += 1; + length -= 1; + } + } + } + else { + if (transfer && (transfer & 255)) { + while (length >= 256) { + if (readb(base + 0x80) & STAT_INT) { + error = 1; + break; + } + + if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ)) + continue; + + readsw(base + DMADATA_OFFSET, addr, 256 >> 1); + addr += 256; + length -= 256; + } + } + + if (!(error)) + while (length > 0) { + unsigned long word; + + if (readb(base + 0x80) & STAT_INT) + break; + + if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ)) + continue; + + word = readw(base + DMADATA_OFFSET); + *addr++ = word; + if (--length > 0) { + *addr++ = word >> 8; + length --; + } + } + } +} + +/* + * Function: int arxescsi_dma_stop(host, SCpnt) + * Purpose : stops DMA/PIO + * Params : host - host + * SCpnt - command + */ +static void arxescsi_dma_stop(struct Scsi_Host *host, Scsi_Pointer *SCp) +{ + /* + * no DMA to stop + */ +} + +/* + * Function: const char *arxescsi_info(struct Scsi_Host * host) + * Purpose : returns a descriptive string about this interface, + * Params : host - driver host structure to return info for. + * Returns : pointer to a static buffer containing null terminated string. + */ +static const char *arxescsi_info(struct Scsi_Host *host) +{ + struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata; + static char string[150]; + + sprintf(string, "%s (%s) in slot %d v%s", + host->hostt->name, info->info.scsi.type, info->ec->slot_no, + VERSION); + + return string; +} + +/* + * Function: int arxescsi_proc_info(char *buffer, char **start, off_t offset, + * int length, int host_no, int inout) + * Purpose : Return information about the driver to a user process accessing + * the /proc filesystem. + * Params : buffer - a buffer to write information to + * start - a pointer into this buffer set by this routine to the start + * of the required information. + * offset - offset into information that we have read upto. + * length - length of buffer + * host_no - host number to return information for + * inout - 0 for reading, 1 for writing. + * Returns : length of data written to buffer. + */ +static int +arxescsi_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, int length, + int inout) +{ + struct arxescsi_info *info; + char *p = buffer; + int pos; + + info = (struct arxescsi_info *)host->hostdata; + if (inout == 1) + return -EINVAL; + + p += sprintf(p, "ARXE 16-bit SCSI driver v%s\n", VERSION); + p += fas216_print_host(&info->info, p); + p += fas216_print_stats(&info->info, p); + p += fas216_print_devices(&info->info, p); + + *start = buffer + offset; + pos = p - buffer - offset; + if (pos > length) + pos = length; + + return pos; +} + +static Scsi_Host_Template arxescsi_template = { + .proc_info = arxescsi_proc_info, + .name = "ARXE SCSI card", + .info = arxescsi_info, + .queuecommand = fas216_noqueue_command, + .eh_host_reset_handler = fas216_eh_host_reset, + .eh_bus_reset_handler = fas216_eh_bus_reset, + .eh_device_reset_handler = fas216_eh_device_reset, + .eh_abort_handler = fas216_eh_abort, + .can_queue = 0, + .this_id = 7, + .sg_tablesize = SG_ALL, + .cmd_per_lun = 1, + .use_clustering = DISABLE_CLUSTERING, + .proc_name = "arxescsi", +}; + +static int __devinit +arxescsi_probe(struct expansion_card *ec, const struct ecard_id *id) +{ + struct Scsi_Host *host; + struct arxescsi_info *info; + unsigned long resbase, reslen; + void __iomem *base; + int ret; + + ret = ecard_request_resources(ec); + if (ret) + goto out; + + resbase = ecard_resource_start(ec, ECARD_RES_MEMC); + reslen = ecard_resource_len(ec, ECARD_RES_MEMC); + base = ioremap(resbase, reslen); + if (!base) { + ret = -ENOMEM; + goto out_region; + } + + host = scsi_host_alloc(&arxescsi_template, sizeof(struct arxescsi_info)); + if (!host) { + ret = -ENOMEM; + goto out_unmap; + } + + info = (struct arxescsi_info *)host->hostdata; + info->ec = ec; + info->base = base; + + info->info.scsi.io_base = base + 0x2000; + info->info.scsi.irq = NO_IRQ; + info->info.scsi.dma = NO_DMA; + info->info.scsi.io_shift = 5; + info->info.ifcfg.clockrate = 24; /* MHz */ + info->info.ifcfg.select_timeout = 255; + info->info.ifcfg.asyncperiod = 200; /* ns */ + info->info.ifcfg.sync_max_depth = 0; + info->info.ifcfg.cntl3 = CNTL3_FASTSCSI | CNTL3_FASTCLK; + info->info.ifcfg.disconnect_ok = 0; + info->info.ifcfg.wide_max_size = 0; + info->info.ifcfg.capabilities = FASCAP_PSEUDODMA; + info->info.dma.setup = arxescsi_dma_setup; + info->info.dma.pseudo = arxescsi_dma_pseudo; + info->info.dma.stop = arxescsi_dma_stop; + + ec->irqaddr = base; + ec->irqmask = CSTATUS_IRQ; + + ret = fas216_init(host); + if (ret) + goto out_unregister; + + ret = fas216_add(host, &ec->dev); + if (ret == 0) + goto out; + + fas216_release(host); + out_unregister: + scsi_host_put(host); + out_unmap: + iounmap(base); + out_region: + ecard_release_resources(ec); + out: + return ret; +} + +static void __devexit arxescsi_remove(struct expansion_card *ec) +{ + struct Scsi_Host *host = ecard_get_drvdata(ec); + struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata; + + ecard_set_drvdata(ec, NULL); + fas216_remove(host); + + iounmap(info->base); + + fas216_release(host); + scsi_host_put(host); + ecard_release_resources(ec); +} + +static const struct ecard_id arxescsi_cids[] = { + { MANU_ARXE, PROD_ARXE_SCSI }, + { 0xffff, 0xffff }, +}; + +static struct ecard_driver arxescsi_driver = { + .probe = arxescsi_probe, + .remove = __devexit_p(arxescsi_remove), + .id_table = arxescsi_cids, + .drv = { + .name = "arxescsi", + }, +}; + +static int __init init_arxe_scsi_driver(void) +{ + return ecard_register_driver(&arxescsi_driver); +} + +static void __exit exit_arxe_scsi_driver(void) +{ + ecard_remove_driver(&arxescsi_driver); +} + +module_init(init_arxe_scsi_driver); +module_exit(exit_arxe_scsi_driver); + +MODULE_AUTHOR("Stefan Hanske"); +MODULE_DESCRIPTION("ARXESCSI driver for Acorn machines"); +MODULE_LICENSE("GPL"); + |