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linux/drivers/scsi/arm/arxescsi.c
Bart Van Assche 116e5de742 scsi: arxescsi: Declare SCSI host template const 
Make it explicit that the SCSI host template is not modified.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20230322195515.1267197-24-bvanassche@acm.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2023-03-24 19:19:21 -04:00

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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 const 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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