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/*
* 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/blk.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 <asm/dma.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/ecard.h>
#include "../../scsi/sd.h"
#include "../../scsi/hosts.h"
#include "arxescsi.h"
#include "fas216.h"
/* Hmm - this should go somewhere else */
#define BUS_ADDR(x) ((((unsigned long)(x)) << 2) + IO_BASE)
/* Configuration */
#define ARXESCSI_XTALFREQ 24
#define ARXESCSI_ASYNC_PERIOD 200
#define ARXESCSI_SYNC_DEPTH 0
/*
* List of devices that the driver will recognise
*/
#define ARXESCSI_LIST { MANU_ARXE, PROD_ARXE_SCSI }
/*
* Version
*/
#define VER_MAJOR 0
#define VER_MINOR 1
#define VER_PATCH 1
static struct expansion_card *ecs[MAX_ECARDS];
/*
* 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;
}
/* Faster transfer routines, written by SH to speed up the loops */
static __inline__ unsigned char getb(unsigned int address, unsigned int reg)
{
unsigned char value;
__asm__ __volatile__(
"ldrb %0, [%1, %2, lsl #5]"
: "=r" (value)
: "r" (address), "r" (reg) );
return value;
}
static __inline__ unsigned int getw(unsigned int address, unsigned int reg)
{
unsigned int value;
__asm__ __volatile__(
"ldr %0, [%1, %2, lsl #5]\n\t"
"mov %0, %0, lsl #16\n\t"
"mov %0, %0, lsr #16"
: "=r" (value)
: "r" (address), "r" (reg) );
return value;
}
static __inline__ void putw(unsigned int address, unsigned int reg, unsigned long value)
{
__asm__ __volatile__(
"mov %0, %0, lsl #16\n\t"
"str %0, [%1, %2, lsl #5]"
:
: "r" (value), "r" (address), "r" (reg) );
}
void arxescsi_pseudo_dma_write(unsigned char *addr, unsigned int io)
{
__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" (io) );
}
/*
* 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
*/
void arxescsi_dma_pseudo(struct Scsi_Host *host, Scsi_Pointer *SCp,
fasdmadir_t direction, int transfer)
{
ARXEScsi_Info *info = (ARXEScsi_Info *)host->hostdata;
unsigned int length, io, error=0;
unsigned char *addr;
length = SCp->this_residual;
addr = SCp->ptr;
io = __ioaddr(host->io_port);
if (direction == DMA_OUT) {
unsigned int word;
while (length > 256) {
if (getb(io, 4) & STAT_INT) {
error=1;
break;
}
arxescsi_pseudo_dma_write(addr, io);
addr += 256;
length -= 256;
}
if (!error)
while (length > 0) {
if (getb(io, 4) & STAT_INT)
break;
if (!(getb(io, 48) & CSTATUS_IRQ))
continue;
word = *addr | *(addr + 1) << 8;
putw(io, 16, word);
if (length > 1) {
addr += 2;
length -= 2;
} else {
addr += 1;
length -= 1;
}
}
}
else {
if (transfer && (transfer & 255)) {
while (length >= 256) {
if (getb(io, 4) & STAT_INT) {
error=1;
break;
}
if (!(getb(io, 48) & CSTATUS_IRQ))
continue;
insw(info->dmaarea, addr, 256 >> 1);
addr += 256;
length -= 256;
}
}
if (!(error))
while (length > 0) {
unsigned long word;
if (getb(io, 4) & STAT_INT)
break;
if (!(getb(io, 48) & CSTATUS_IRQ))
continue;
word = getw(io, 16);
*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: int arxescsi_detect(Scsi_Host_Template * tpnt)
* Purpose : initialises ARXE SCSI driver
* Params : tpnt - template for this SCSI adapter
* Returns : >0 if host found, 0 otherwise.
*/
int arxescsi_detect(Scsi_Host_Template *tpnt)
{
static const card_ids arxescsi_cids[] = { ARXESCSI_LIST, { 0xffff, 0xffff} };
int count = 0;
struct Scsi_Host *host;
tpnt->proc_name = "arxescsi";
memset(ecs, 0, sizeof (ecs));
ecard_startfind();
while (1) {
ARXEScsi_Info *info;
ecs[count] = ecard_find(0, arxescsi_cids);
if (!ecs[count])
break;
ecard_claim(ecs[count]);
host = scsi_register(tpnt, sizeof (ARXEScsi_Info));
if (!host) {
ecard_release(ecs[count]);
break;
}
host->io_port = ecard_address(ecs[count], ECARD_MEMC, 0) + 0x0800;
host->irq = NO_IRQ;
host->dma_channel = NO_DMA;
host->can_queue = 0; /* no command queueing */
info = (ARXEScsi_Info *)host->hostdata;
info->info.scsi.io_port = host->io_port;
info->info.scsi.irq = host->irq;
info->info.scsi.io_shift = 3;
info->info.ifcfg.clockrate = ARXESCSI_XTALFREQ;
info->info.ifcfg.select_timeout = 255;
info->info.ifcfg.asyncperiod = ARXESCSI_ASYNC_PERIOD;
info->info.ifcfg.sync_max_depth = ARXESCSI_SYNC_DEPTH;
info->info.ifcfg.cntl3 = CNTL3_FASTSCSI | CNTL3_FASTCLK;
info->info.ifcfg.disconnect_ok = 0;
info->info.ifcfg.wide_max_size = 0;
info->info.dma.setup = arxescsi_dma_setup;
info->info.dma.pseudo = arxescsi_dma_pseudo;
info->info.dma.stop = arxescsi_dma_stop;
info->dmaarea = host->io_port + 128;
info->cstatus = host->io_port + 384;
ecs[count]->irqaddr = (unsigned char *)BUS_ADDR(host->io_port);
ecs[count]->irqmask = CSTATUS_IRQ;
request_region(host->io_port , 120, "arxescsi-fas");
request_region(host->io_port + 128, 384, "arxescsi-dma");
printk("scsi%d: Has no interrupts - using polling mode\n",
host->host_no);
fas216_init(host);
++count;
}
return count;
}
/*
* Function: int arxescsi_release(struct Scsi_Host * host)
* Purpose : releases all resources used by this adapter
* Params : host - driver host structure to return info for.
* Returns : nothing
*/
int arxescsi_release(struct Scsi_Host *host)
{
int i;
fas216_release(host);
release_region(host->io_port, 120);
release_region(host->io_port + 128, 384);
for (i = 0; i < MAX_ECARDS; i++)
if (ecs[i] && host->io_port == (ecard_address(ecs[i], ECARD_MEMC, 0) + 0x0800))
ecard_release(ecs[i]);
return 0;
}
/*
* 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.
*/
const char *arxescsi_info(struct Scsi_Host *host)
{
ARXEScsi_Info *info = (ARXEScsi_Info *)host->hostdata;
static char string[100], *p;
p = string;
p += sprintf(p, "%s ", host->hostt->name);
p += fas216_info(&info->info, p);
p += sprintf(p, "v%d.%d.%d", VER_MAJOR, VER_MINOR, VER_PATCH);
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.
*/
int arxescsi_proc_info(char *buffer, char **start, off_t offset,
int length, int host_no, int inout)
{
int pos, begin;
struct Scsi_Host *host = scsi_hostlist;
ARXEScsi_Info *info;
Scsi_Device *scd;
while (host) {
if (host->host_no == host_no)
break;
host = host->next;
}
if (!host)
return 0;
info = (ARXEScsi_Info *)host->hostdata;
if (inout == 1)
return -EINVAL;
begin = 0;
pos = sprintf(buffer,
"ARXE 16-bit SCSI driver version %d.%d.%d\n",
VER_MAJOR, VER_MINOR, VER_PATCH);
pos += fas216_print_host(&info->info, buffer + pos);
pos += fas216_print_stats(&info->info, buffer + pos);
pos += sprintf (buffer+pos, "\nAttached devices:\n");
for (scd = host->host_queue; scd; scd = scd->next) {
pos += fas216_print_device(&info->info, scd, buffer + pos);
if (pos + begin < offset) {
begin += pos;
pos = 0;
}
if (pos + begin > offset + length)
break;
}
*start = buffer + (offset - begin);
pos -= offset - begin;
if (pos > length)
pos = length;
return pos;
}
static Scsi_Host_Template arxescsi_template = ARXEScsi;
static int __init init_arxe_scsi_driver(void)
{
arxescsi_template.module = THIS_MODULE;
scsi_register_module(MODULE_SCSI_HA, &arxescsi_template);
if (arxescsi_template.present)
return 0;
scsi_unregister_module(MODULE_SCSI_HA, &arxescsi_template);
return -ENODEV;
}
static void __exit exit_arxe_scsi_driver(void)
{
scsi_unregister_module(MODULE_SCSI_HA, &arxescsi_template);
}
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");
EXPORT_NO_SYMBOLS;
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