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linux/drivers/scsi/arm/arxescsi.c
Bart Van Assche 53555fb7bc scsi: Remove drivers/scsi/scsi.h 
The following two header files have the same file name: include/scsi/scsi.h
and drivers/scsi/scsi.h. This is confusing. Remove the latter since the
following note was added in drivers/scsi/scsi.h in 2004:

"NOTE: this file only contains compatibility glue for old drivers. All
these wrappers will be removed sooner or later. For new code please use
the interfaces declared in the headers in include/scsi/"

Link: https://lore.kernel.org/r/20220218195117.25689-7-bvanassche@acm.org
Cc: Christoph Hellwig <hch@lst.de>
Cc: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2022-02-22 21:11:02 -05:00

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// 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/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.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,
.cmd_size = sizeof(struct fas216_cmd_priv),
.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");
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