forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
358 lines
8.8 KiB
358 lines
8.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* 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, |
|
.dma_boundary = PAGE_SIZE - 1, |
|
.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"); |
|
|
|
|