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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * linux/drivers/scsi/arm/arxescsi.c4 *5 * Copyright (C) 1997-2000 Russell King, Stefan Hanske6 *7 * This driver is based on experimentation. Hence, it may have made8 * assumptions about the particular card that I have available, and9 * may not be reliable!10 *11 * Changelog:12 * 30-08-1997 RMK 0.0.0 Created, READONLY version as cumana_2.c13 * 22-01-1998 RMK 0.0.1 Updated to 2.1.8014 * 15-04-1998 RMK 0.0.1 Only do PIO if FAS216 will allow it.15 * 11-06-1998 SH 0.0.2 Changed to support ARXE 16-bit SCSI card16 * enabled writing17 * 01-01-2000 SH 0.1.0 Added *real* pseudo dma writing18 * (arxescsi_pseudo_dma_write)19 * 02-04-2000 RMK 0.1.1 Updated for new error handling code.20 * 22-10-2000 SH Updated for new registering scheme.21 */22#include <linux/module.h>23#include <linux/blkdev.h>24#include <linux/kernel.h>25#include <linux/string.h>26#include <linux/ioport.h>27#include <linux/proc_fs.h>28#include <linux/unistd.h>29#include <linux/stat.h>30#include <linux/delay.h>31#include <linux/init.h>32#include <linux/interrupt.h>33 34#include <asm/dma.h>35#include <asm/io.h>36#include <asm/ecard.h>37 38#include <scsi/scsi.h>39#include <scsi/scsi_cmnd.h>40#include <scsi/scsi_device.h>41#include <scsi/scsi_eh.h>42#include <scsi/scsi_host.h>43#include <scsi/scsi_tcq.h>44#include "fas216.h"45 46struct arxescsi_info {47 FAS216_Info info;48 struct expansion_card *ec;49 void __iomem *base;50};51 52#define DMADATA_OFFSET (0x200)53 54#define DMASTAT_OFFSET (0x600)55#define DMASTAT_DRQ (1 << 0)56 57#define CSTATUS_IRQ (1 << 0)58 59#define VERSION "1.10 (23/01/2003 2.5.57)"60 61/*62 * Function: int arxescsi_dma_setup(host, SCpnt, direction, min_type)63 * Purpose : initialises DMA/PIO64 * Params : host - host65 * SCpnt - command66 * direction - DMA on to/off of card67 * min_type - minimum DMA support that we must have for this transfer68 * Returns : 0 if we should not set CMD_WITHDMA for transfer info command69 */70static fasdmatype_t71arxescsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,72 fasdmadir_t direction, fasdmatype_t min_type)73{74 /*75 * We don't do real DMA76 */77 return fasdma_pseudo;78}79 80static void arxescsi_pseudo_dma_write(unsigned char *addr, void __iomem *base)81{82 __asm__ __volatile__(83 " stmdb sp!, {r0-r12}\n"84 " mov r3, %0\n"85 " mov r1, %1\n"86 " add r2, r1, #512\n"87 " mov r4, #256\n"88 ".loop_1: ldmia r3!, {r6, r8, r10, r12}\n"89 " mov r5, r6, lsl #16\n"90 " mov r7, r8, lsl #16\n"91 ".loop_2: ldrb r0, [r1, #1536]\n"92 " tst r0, #1\n"93 " beq .loop_2\n"94 " stmia r2, {r5-r8}\n\t"95 " mov r9, r10, lsl #16\n"96 " mov r11, r12, lsl #16\n"97 ".loop_3: ldrb r0, [r1, #1536]\n"98 " tst r0, #1\n"99 " beq .loop_3\n"100 " stmia r2, {r9-r12}\n"101 " subs r4, r4, #16\n"102 " bne .loop_1\n"103 " ldmia sp!, {r0-r12}\n"104 :105 : "r" (addr), "r" (base));106}107 108/*109 * Function: int arxescsi_dma_pseudo(host, SCpnt, direction, transfer)110 * Purpose : handles pseudo DMA111 * Params : host - host112 * SCpnt - command113 * direction - DMA on to/off of card114 * transfer - minimum number of bytes we expect to transfer115 */116static void117arxescsi_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,118 fasdmadir_t direction, int transfer)119{120 struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;121 unsigned int length, error = 0;122 void __iomem *base = info->info.scsi.io_base;123 unsigned char *addr;124 125 length = SCp->this_residual;126 addr = SCp->ptr;127 128 if (direction == DMA_OUT) {129 unsigned int word;130 while (length > 256) {131 if (readb(base + 0x80) & STAT_INT) {132 error = 1;133 break;134 }135 arxescsi_pseudo_dma_write(addr, base);136 addr += 256;137 length -= 256;138 }139 140 if (!error)141 while (length > 0) {142 if (readb(base + 0x80) & STAT_INT)143 break;144 145 if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))146 continue;147 148 word = *addr | *(addr + 1) << 8;149 150 writew(word, base + DMADATA_OFFSET);151 if (length > 1) {152 addr += 2;153 length -= 2;154 } else {155 addr += 1;156 length -= 1;157 }158 }159 }160 else {161 if (transfer && (transfer & 255)) {162 while (length >= 256) {163 if (readb(base + 0x80) & STAT_INT) {164 error = 1;165 break;166 }167 168 if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))169 continue;170 171 readsw(base + DMADATA_OFFSET, addr, 256 >> 1);172 addr += 256;173 length -= 256;174 }175 }176 177 if (!(error))178 while (length > 0) {179 unsigned long word;180 181 if (readb(base + 0x80) & STAT_INT)182 break;183 184 if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))185 continue;186 187 word = readw(base + DMADATA_OFFSET);188 *addr++ = word;189 if (--length > 0) {190 *addr++ = word >> 8;191 length --;192 }193 }194 }195}196 197/*198 * Function: int arxescsi_dma_stop(host, SCpnt)199 * Purpose : stops DMA/PIO200 * Params : host - host201 * SCpnt - command202 */203static void arxescsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)204{205 /*206 * no DMA to stop207 */208}209 210/*211 * Function: const char *arxescsi_info(struct Scsi_Host * host)212 * Purpose : returns a descriptive string about this interface,213 * Params : host - driver host structure to return info for.214 * Returns : pointer to a static buffer containing null terminated string.215 */216static const char *arxescsi_info(struct Scsi_Host *host)217{218 struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;219 static char string[150];220 221 sprintf(string, "%s (%s) in slot %d v%s",222 host->hostt->name, info->info.scsi.type, info->ec->slot_no,223 VERSION);224 225 return string;226}227 228static int229arxescsi_show_info(struct seq_file *m, struct Scsi_Host *host)230{231 struct arxescsi_info *info;232 info = (struct arxescsi_info *)host->hostdata;233 234 seq_printf(m, "ARXE 16-bit SCSI driver v%s\n", VERSION);235 fas216_print_host(&info->info, m);236 fas216_print_stats(&info->info, m);237 fas216_print_devices(&info->info, m);238 return 0;239}240 241static const struct scsi_host_template arxescsi_template = {242 .show_info = arxescsi_show_info,243 .name = "ARXE SCSI card",244 .info = arxescsi_info,245 .queuecommand = fas216_noqueue_command,246 .eh_host_reset_handler = fas216_eh_host_reset,247 .eh_bus_reset_handler = fas216_eh_bus_reset,248 .eh_device_reset_handler = fas216_eh_device_reset,249 .eh_abort_handler = fas216_eh_abort,250 .cmd_size = sizeof(struct fas216_cmd_priv),251 .can_queue = 0,252 .this_id = 7,253 .sg_tablesize = SG_ALL,254 .dma_boundary = PAGE_SIZE - 1,255 .proc_name = "arxescsi",256};257 258static int arxescsi_probe(struct expansion_card *ec, const struct ecard_id *id)259{260 struct Scsi_Host *host;261 struct arxescsi_info *info;262 void __iomem *base;263 int ret;264 265 ret = ecard_request_resources(ec);266 if (ret)267 goto out;268 269 base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);270 if (!base) {271 ret = -ENOMEM;272 goto out_region;273 }274 275 host = scsi_host_alloc(&arxescsi_template, sizeof(struct arxescsi_info));276 if (!host) {277 ret = -ENOMEM;278 goto out_region;279 }280 281 info = (struct arxescsi_info *)host->hostdata;282 info->ec = ec;283 info->base = base;284 285 info->info.scsi.io_base = base + 0x2000;286 info->info.scsi.irq = 0;287 info->info.scsi.dma = NO_DMA;288 info->info.scsi.io_shift = 5;289 info->info.ifcfg.clockrate = 24; /* MHz */290 info->info.ifcfg.select_timeout = 255;291 info->info.ifcfg.asyncperiod = 200; /* ns */292 info->info.ifcfg.sync_max_depth = 0;293 info->info.ifcfg.cntl3 = CNTL3_FASTSCSI | CNTL3_FASTCLK;294 info->info.ifcfg.disconnect_ok = 0;295 info->info.ifcfg.wide_max_size = 0;296 info->info.ifcfg.capabilities = FASCAP_PSEUDODMA;297 info->info.dma.setup = arxescsi_dma_setup;298 info->info.dma.pseudo = arxescsi_dma_pseudo;299 info->info.dma.stop = arxescsi_dma_stop;300 301 ec->irqaddr = base;302 ec->irqmask = CSTATUS_IRQ;303 304 ret = fas216_init(host);305 if (ret)306 goto out_unregister;307 308 ret = fas216_add(host, &ec->dev);309 if (ret == 0)310 goto out;311 312 fas216_release(host);313 out_unregister:314 scsi_host_put(host);315 out_region:316 ecard_release_resources(ec);317 out:318 return ret;319}320 321static void arxescsi_remove(struct expansion_card *ec)322{323 struct Scsi_Host *host = ecard_get_drvdata(ec);324 325 ecard_set_drvdata(ec, NULL);326 fas216_remove(host);327 328 fas216_release(host);329 scsi_host_put(host);330 ecard_release_resources(ec);331}332 333static const struct ecard_id arxescsi_cids[] = {334 { MANU_ARXE, PROD_ARXE_SCSI },335 { 0xffff, 0xffff },336};337 338static struct ecard_driver arxescsi_driver = {339 .probe = arxescsi_probe,340 .remove = arxescsi_remove,341 .id_table = arxescsi_cids,342 .drv = {343 .name = "arxescsi",344 },345};346 347static int __init init_arxe_scsi_driver(void)348{349 return ecard_register_driver(&arxescsi_driver);350}351 352static void __exit exit_arxe_scsi_driver(void)353{354 ecard_remove_driver(&arxescsi_driver);355}356 357module_init(init_arxe_scsi_driver);358module_exit(exit_arxe_scsi_driver);359 360MODULE_AUTHOR("Stefan Hanske");361MODULE_DESCRIPTION("ARXESCSI driver for Acorn machines");362MODULE_LICENSE("GPL");363 364