358 lines
8.8 KiB
C
358 lines
8.8 KiB
C
/*
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* linux/drivers/scsi/arm/arxescsi.c
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*
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* Copyright (C) 1997-2000 Russell King, Stefan Hanske
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*
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* This driver is based on experimentation. Hence, it may have made
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* assumptions about the particular card that I have available, and
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* may not be reliable!
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*
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* Changelog:
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* 30-08-1997 RMK 0.0.0 Created, READONLY version as cumana_2.c
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* 22-01-1998 RMK 0.0.1 Updated to 2.1.80
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* 15-04-1998 RMK 0.0.1 Only do PIO if FAS216 will allow it.
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* 11-06-1998 SH 0.0.2 Changed to support ARXE 16-bit SCSI card
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* enabled writing
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* 01-01-2000 SH 0.1.0 Added *real* pseudo dma writing
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* (arxescsi_pseudo_dma_write)
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* 02-04-2000 RMK 0.1.1 Updated for new error handling code.
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* 22-10-2000 SH Updated for new registering scheme.
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*/
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#include <linux/module.h>
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#include <linux/blkdev.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/ioport.h>
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#include <linux/proc_fs.h>
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#include <linux/unistd.h>
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#include <linux/stat.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <asm/dma.h>
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#include <asm/io.h>
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#include <asm/ecard.h>
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#include "../scsi.h"
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#include <scsi/scsi_host.h>
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#include "fas216.h"
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struct arxescsi_info {
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FAS216_Info info;
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struct expansion_card *ec;
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void __iomem *base;
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};
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#define DMADATA_OFFSET (0x200)
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#define DMASTAT_OFFSET (0x600)
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#define DMASTAT_DRQ (1 << 0)
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#define CSTATUS_IRQ (1 << 0)
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#define VERSION "1.10 (23/01/2003 2.5.57)"
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/*
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* Function: int arxescsi_dma_setup(host, SCpnt, direction, min_type)
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* Purpose : initialises DMA/PIO
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* Params : host - host
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* SCpnt - command
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* direction - DMA on to/off of card
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* min_type - minimum DMA support that we must have for this transfer
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* Returns : 0 if we should not set CMD_WITHDMA for transfer info command
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*/
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static fasdmatype_t
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arxescsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
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fasdmadir_t direction, fasdmatype_t min_type)
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{
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/*
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* We don't do real DMA
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*/
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return fasdma_pseudo;
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}
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static void arxescsi_pseudo_dma_write(unsigned char *addr, void __iomem *base)
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{
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__asm__ __volatile__(
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" stmdb sp!, {r0-r12}\n"
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" mov r3, %0\n"
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" mov r1, %1\n"
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" add r2, r1, #512\n"
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" mov r4, #256\n"
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".loop_1: ldmia r3!, {r6, r8, r10, r12}\n"
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" mov r5, r6, lsl #16\n"
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" mov r7, r8, lsl #16\n"
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".loop_2: ldrb r0, [r1, #1536]\n"
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" tst r0, #1\n"
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" beq .loop_2\n"
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" stmia r2, {r5-r8}\n\t"
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" mov r9, r10, lsl #16\n"
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" mov r11, r12, lsl #16\n"
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".loop_3: ldrb r0, [r1, #1536]\n"
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" tst r0, #1\n"
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" beq .loop_3\n"
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" stmia r2, {r9-r12}\n"
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" subs r4, r4, #16\n"
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" bne .loop_1\n"
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" ldmia sp!, {r0-r12}\n"
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:
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: "r" (addr), "r" (base));
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}
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/*
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* Function: int arxescsi_dma_pseudo(host, SCpnt, direction, transfer)
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* Purpose : handles pseudo DMA
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* Params : host - host
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* SCpnt - command
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* direction - DMA on to/off of card
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* transfer - minimum number of bytes we expect to transfer
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*/
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static void
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arxescsi_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,
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fasdmadir_t direction, int transfer)
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{
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struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;
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unsigned int length, error = 0;
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void __iomem *base = info->info.scsi.io_base;
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unsigned char *addr;
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length = SCp->this_residual;
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addr = SCp->ptr;
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if (direction == DMA_OUT) {
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unsigned int word;
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while (length > 256) {
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if (readb(base + 0x80) & STAT_INT) {
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error = 1;
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break;
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}
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arxescsi_pseudo_dma_write(addr, base);
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addr += 256;
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length -= 256;
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}
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if (!error)
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while (length > 0) {
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if (readb(base + 0x80) & STAT_INT)
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break;
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if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
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continue;
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word = *addr | *(addr + 1) << 8;
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writew(word, base + DMADATA_OFFSET);
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if (length > 1) {
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addr += 2;
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length -= 2;
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} else {
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addr += 1;
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length -= 1;
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}
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}
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}
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else {
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if (transfer && (transfer & 255)) {
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while (length >= 256) {
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if (readb(base + 0x80) & STAT_INT) {
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error = 1;
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break;
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}
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if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
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continue;
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readsw(base + DMADATA_OFFSET, addr, 256 >> 1);
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addr += 256;
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length -= 256;
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}
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}
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if (!(error))
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while (length > 0) {
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unsigned long word;
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if (readb(base + 0x80) & STAT_INT)
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break;
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if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
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continue;
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word = readw(base + DMADATA_OFFSET);
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*addr++ = word;
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if (--length > 0) {
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*addr++ = word >> 8;
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length --;
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}
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}
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}
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}
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/*
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* Function: int arxescsi_dma_stop(host, SCpnt)
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* Purpose : stops DMA/PIO
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* Params : host - host
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* SCpnt - command
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*/
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static void arxescsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
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{
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/*
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* no DMA to stop
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*/
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}
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/*
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* Function: const char *arxescsi_info(struct Scsi_Host * host)
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* Purpose : returns a descriptive string about this interface,
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* Params : host - driver host structure to return info for.
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* Returns : pointer to a static buffer containing null terminated string.
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*/
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static const char *arxescsi_info(struct Scsi_Host *host)
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{
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struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;
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static char string[150];
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sprintf(string, "%s (%s) in slot %d v%s",
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host->hostt->name, info->info.scsi.type, info->ec->slot_no,
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VERSION);
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return string;
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}
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static int
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arxescsi_show_info(struct seq_file *m, struct Scsi_Host *host)
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{
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struct arxescsi_info *info;
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info = (struct arxescsi_info *)host->hostdata;
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seq_printf(m, "ARXE 16-bit SCSI driver v%s\n", VERSION);
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fas216_print_host(&info->info, m);
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fas216_print_stats(&info->info, m);
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fas216_print_devices(&info->info, m);
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return 0;
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}
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static struct scsi_host_template arxescsi_template = {
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.show_info = arxescsi_show_info,
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.name = "ARXE SCSI card",
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.info = arxescsi_info,
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.queuecommand = fas216_noqueue_command,
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.eh_host_reset_handler = fas216_eh_host_reset,
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.eh_bus_reset_handler = fas216_eh_bus_reset,
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.eh_device_reset_handler = fas216_eh_device_reset,
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.eh_abort_handler = fas216_eh_abort,
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.can_queue = 0,
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.this_id = 7,
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.sg_tablesize = SG_ALL,
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.cmd_per_lun = 1,
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.use_clustering = DISABLE_CLUSTERING,
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.proc_name = "arxescsi",
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};
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static int arxescsi_probe(struct expansion_card *ec, const struct ecard_id *id)
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{
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struct Scsi_Host *host;
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struct arxescsi_info *info;
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void __iomem *base;
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int ret;
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ret = ecard_request_resources(ec);
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if (ret)
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goto out;
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base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
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if (!base) {
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ret = -ENOMEM;
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goto out_region;
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}
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host = scsi_host_alloc(&arxescsi_template, sizeof(struct arxescsi_info));
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if (!host) {
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ret = -ENOMEM;
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goto out_region;
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}
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info = (struct arxescsi_info *)host->hostdata;
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info->ec = ec;
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info->base = base;
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info->info.scsi.io_base = base + 0x2000;
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info->info.scsi.irq = 0;
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info->info.scsi.dma = NO_DMA;
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info->info.scsi.io_shift = 5;
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info->info.ifcfg.clockrate = 24; /* MHz */
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info->info.ifcfg.select_timeout = 255;
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info->info.ifcfg.asyncperiod = 200; /* ns */
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info->info.ifcfg.sync_max_depth = 0;
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info->info.ifcfg.cntl3 = CNTL3_FASTSCSI | CNTL3_FASTCLK;
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info->info.ifcfg.disconnect_ok = 0;
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info->info.ifcfg.wide_max_size = 0;
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info->info.ifcfg.capabilities = FASCAP_PSEUDODMA;
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info->info.dma.setup = arxescsi_dma_setup;
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info->info.dma.pseudo = arxescsi_dma_pseudo;
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info->info.dma.stop = arxescsi_dma_stop;
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ec->irqaddr = base;
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ec->irqmask = CSTATUS_IRQ;
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ret = fas216_init(host);
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if (ret)
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goto out_unregister;
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ret = fas216_add(host, &ec->dev);
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if (ret == 0)
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goto out;
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fas216_release(host);
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out_unregister:
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scsi_host_put(host);
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out_region:
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ecard_release_resources(ec);
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out:
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return ret;
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}
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static void arxescsi_remove(struct expansion_card *ec)
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{
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struct Scsi_Host *host = ecard_get_drvdata(ec);
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ecard_set_drvdata(ec, NULL);
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fas216_remove(host);
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fas216_release(host);
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scsi_host_put(host);
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ecard_release_resources(ec);
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}
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static const struct ecard_id arxescsi_cids[] = {
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{ MANU_ARXE, PROD_ARXE_SCSI },
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{ 0xffff, 0xffff },
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};
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static struct ecard_driver arxescsi_driver = {
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.probe = arxescsi_probe,
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.remove = arxescsi_remove,
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.id_table = arxescsi_cids,
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.drv = {
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.name = "arxescsi",
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},
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};
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static int __init init_arxe_scsi_driver(void)
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{
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return ecard_register_driver(&arxescsi_driver);
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}
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static void __exit exit_arxe_scsi_driver(void)
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{
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ecard_remove_driver(&arxescsi_driver);
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}
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module_init(init_arxe_scsi_driver);
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module_exit(exit_arxe_scsi_driver);
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MODULE_AUTHOR("Stefan Hanske");
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MODULE_DESCRIPTION("ARXESCSI driver for Acorn machines");
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MODULE_LICENSE("GPL");
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