358 lines
8.8 KiB
C
358 lines
8.8 KiB
C
/*
|
|
* linux/drivers/scsi/arm/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/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/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, struct 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, struct 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, struct 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;
|
|
}
|
|
|
|
static int
|
|
arxescsi_show_info(struct seq_file *m, struct Scsi_Host *host)
|
|
{
|
|
struct arxescsi_info *info;
|
|
info = (struct arxescsi_info *)host->hostdata;
|
|
|
|
seq_printf(m, "ARXE 16-bit SCSI driver v%s\n", VERSION);
|
|
fas216_print_host(&info->info, m);
|
|
fas216_print_stats(&info->info, m);
|
|
fas216_print_devices(&info->info, m);
|
|
return 0;
|
|
}
|
|
|
|
static struct scsi_host_template arxescsi_template = {
|
|
.show_info = arxescsi_show_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,
|
|
.use_clustering = DISABLE_CLUSTERING,
|
|
.proc_name = "arxescsi",
|
|
};
|
|
|
|
static int arxescsi_probe(struct expansion_card *ec, const struct ecard_id *id)
|
|
{
|
|
struct Scsi_Host *host;
|
|
struct arxescsi_info *info;
|
|
void __iomem *base;
|
|
int ret;
|
|
|
|
ret = ecard_request_resources(ec);
|
|
if (ret)
|
|
goto out;
|
|
|
|
base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
|
|
if (!base) {
|
|
ret = -ENOMEM;
|
|
goto out_region;
|
|
}
|
|
|
|
host = scsi_host_alloc(&arxescsi_template, sizeof(struct arxescsi_info));
|
|
if (!host) {
|
|
ret = -ENOMEM;
|
|
goto out_region;
|
|
}
|
|
|
|
info = (struct arxescsi_info *)host->hostdata;
|
|
info->ec = ec;
|
|
info->base = base;
|
|
|
|
info->info.scsi.io_base = base + 0x2000;
|
|
info->info.scsi.irq = 0;
|
|
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_region:
|
|
ecard_release_resources(ec);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void arxescsi_remove(struct expansion_card *ec)
|
|
{
|
|
struct Scsi_Host *host = ecard_get_drvdata(ec);
|
|
|
|
ecard_set_drvdata(ec, NULL);
|
|
fas216_remove(host);
|
|
|
|
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 = 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");
|
|
|