525 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * linux/drivers/acorn/scsi/cumana_2.c4 *5 * Copyright (C) 1997-2005 Russell King6 *7 * Changelog:8 * 30-08-1997 RMK 0.0.0 Created, READONLY version.9 * 22-01-1998 RMK 0.0.1 Updated to 2.1.80.10 * 15-04-1998 RMK 0.0.1 Only do PIO if FAS216 will allow it.11 * 02-05-1998 RMK 0.0.2 Updated & added DMA support.12 * 27-06-1998 RMK Changed asm/delay.h to linux/delay.h13 * 18-08-1998 RMK 0.0.3 Fixed synchronous transfer depth.14 * 02-04-2000 RMK 0.0.4 Updated for new error handling code.15 */16#include <linux/module.h>17#include <linux/blkdev.h>18#include <linux/kernel.h>19#include <linux/string.h>20#include <linux/ioport.h>21#include <linux/proc_fs.h>22#include <linux/delay.h>23#include <linux/interrupt.h>24#include <linux/init.h>25#include <linux/dma-mapping.h>26#include <linux/pgtable.h>27 28#include <asm/dma.h>29#include <asm/ecard.h>30#include <asm/io.h>31 32#include <scsi/scsi.h>33#include <scsi/scsi_cmnd.h>34#include <scsi/scsi_device.h>35#include <scsi/scsi_eh.h>36#include <scsi/scsi_host.h>37#include <scsi/scsi_tcq.h>38#include "fas216.h"39#include "arm_scsi.h"40 41#include <scsi/scsicam.h>42 43#define CUMANASCSI2_STATUS (0x0000)44#define STATUS_INT (1 << 0)45#define STATUS_DRQ (1 << 1)46#define STATUS_LATCHED (1 << 3)47 48#define CUMANASCSI2_ALATCH (0x0014)49#define ALATCH_ENA_INT (3)50#define ALATCH_DIS_INT (2)51#define ALATCH_ENA_TERM (5)52#define ALATCH_DIS_TERM (4)53#define ALATCH_ENA_BIT32 (11)54#define ALATCH_DIS_BIT32 (10)55#define ALATCH_ENA_DMA (13)56#define ALATCH_DIS_DMA (12)57#define ALATCH_DMA_OUT (15)58#define ALATCH_DMA_IN (14)59 60#define CUMANASCSI2_PSEUDODMA (0x0200)61 62#define CUMANASCSI2_FAS216_OFFSET (0x0300)63#define CUMANASCSI2_FAS216_SHIFT 264 65/*66 * Version67 */68#define VERSION "1.00 (13/11/2002 2.5.47)"69 70/*71 * Use term=0,1,0,0,0 to turn terminators on/off72 */73static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };74 75#define NR_SG 25676 77struct cumanascsi2_info {78 FAS216_Info info;79 struct expansion_card *ec;80 void __iomem *base;81 unsigned int terms; /* Terminator state */82 struct scatterlist sg[NR_SG]; /* Scatter DMA list */83};84 85#define CSTATUS_IRQ (1 << 0)86#define CSTATUS_DRQ (1 << 1)87 88/* Prototype: void cumanascsi_2_irqenable(ec, irqnr)89 * Purpose : Enable interrupts on Cumana SCSI 2 card90 * Params : ec - expansion card structure91 * : irqnr - interrupt number92 */93static void94cumanascsi_2_irqenable(struct expansion_card *ec, int irqnr)95{96 struct cumanascsi2_info *info = ec->irq_data;97 writeb(ALATCH_ENA_INT, info->base + CUMANASCSI2_ALATCH);98}99 100/* Prototype: void cumanascsi_2_irqdisable(ec, irqnr)101 * Purpose : Disable interrupts on Cumana SCSI 2 card102 * Params : ec - expansion card structure103 * : irqnr - interrupt number104 */105static void106cumanascsi_2_irqdisable(struct expansion_card *ec, int irqnr)107{108 struct cumanascsi2_info *info = ec->irq_data;109 writeb(ALATCH_DIS_INT, info->base + CUMANASCSI2_ALATCH);110}111 112static const expansioncard_ops_t cumanascsi_2_ops = {113 .irqenable = cumanascsi_2_irqenable,114 .irqdisable = cumanascsi_2_irqdisable,115};116 117/* Prototype: void cumanascsi_2_terminator_ctl(host, on_off)118 * Purpose : Turn the Cumana SCSI 2 terminators on or off119 * Params : host - card to turn on/off120 * : on_off - !0 to turn on, 0 to turn off121 */122static void123cumanascsi_2_terminator_ctl(struct Scsi_Host *host, int on_off)124{125 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;126 127 if (on_off) {128 info->terms = 1;129 writeb(ALATCH_ENA_TERM, info->base + CUMANASCSI2_ALATCH);130 } else {131 info->terms = 0;132 writeb(ALATCH_DIS_TERM, info->base + CUMANASCSI2_ALATCH);133 }134}135 136/* Prototype: void cumanascsi_2_intr(irq, *dev_id, *regs)137 * Purpose : handle interrupts from Cumana SCSI 2 card138 * Params : irq - interrupt number139 * dev_id - user-defined (Scsi_Host structure)140 */141static irqreturn_t142cumanascsi_2_intr(int irq, void *dev_id)143{144 struct cumanascsi2_info *info = dev_id;145 146 return fas216_intr(&info->info);147}148 149/* Prototype: fasdmatype_t cumanascsi_2_dma_setup(host, SCpnt, direction, min_type)150 * Purpose : initialises DMA/PIO151 * Params : host - host152 * SCpnt - command153 * direction - DMA on to/off of card154 * min_type - minimum DMA support that we must have for this transfer155 * Returns : type of transfer to be performed156 */157static fasdmatype_t158cumanascsi_2_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,159 fasdmadir_t direction, fasdmatype_t min_type)160{161 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;162 struct device *dev = scsi_get_device(host);163 int dmach = info->info.scsi.dma;164 165 writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH);166 167 if (dmach != NO_DMA &&168 (min_type == fasdma_real_all || SCp->this_residual >= 512)) {169 int bufs, map_dir, dma_dir, alatch_dir;170 171 bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);172 173 if (direction == DMA_OUT) {174 map_dir = DMA_TO_DEVICE;175 dma_dir = DMA_MODE_WRITE;176 alatch_dir = ALATCH_DMA_OUT;177 } else {178 map_dir = DMA_FROM_DEVICE;179 dma_dir = DMA_MODE_READ;180 alatch_dir = ALATCH_DMA_IN;181 }182 183 dma_map_sg(dev, info->sg, bufs, map_dir);184 185 disable_dma(dmach);186 set_dma_sg(dmach, info->sg, bufs);187 writeb(alatch_dir, info->base + CUMANASCSI2_ALATCH);188 set_dma_mode(dmach, dma_dir);189 enable_dma(dmach);190 writeb(ALATCH_ENA_DMA, info->base + CUMANASCSI2_ALATCH);191 writeb(ALATCH_DIS_BIT32, info->base + CUMANASCSI2_ALATCH);192 return fasdma_real_all;193 }194 195 /*196 * If we're not doing DMA,197 * we'll do pseudo DMA198 */199 return fasdma_pio;200}201 202/*203 * Prototype: void cumanascsi_2_dma_pseudo(host, SCpnt, direction, transfer)204 * Purpose : handles pseudo DMA205 * Params : host - host206 * SCpnt - command207 * direction - DMA on to/off of card208 * transfer - minimum number of bytes we expect to transfer209 */210static void211cumanascsi_2_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,212 fasdmadir_t direction, int transfer)213{214 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;215 unsigned int length;216 unsigned char *addr;217 218 length = SCp->this_residual;219 addr = SCp->ptr;220 221 if (direction == DMA_OUT)222#if 0223 while (length > 1) {224 unsigned long word;225 unsigned int status = readb(info->base + CUMANASCSI2_STATUS);226 227 if (status & STATUS_INT)228 goto end;229 230 if (!(status & STATUS_DRQ))231 continue;232 233 word = *addr | *(addr + 1) << 8;234 writew(word, info->base + CUMANASCSI2_PSEUDODMA);235 addr += 2;236 length -= 2;237 }238#else239 printk ("PSEUDO_OUT???\n");240#endif241 else {242 if (transfer && (transfer & 255)) {243 while (length >= 256) {244 unsigned int status = readb(info->base + CUMANASCSI2_STATUS);245 246 if (status & STATUS_INT)247 return;248 249 if (!(status & STATUS_DRQ))250 continue;251 252 readsw(info->base + CUMANASCSI2_PSEUDODMA,253 addr, 256 >> 1);254 addr += 256;255 length -= 256;256 }257 }258 259 while (length > 0) {260 unsigned long word;261 unsigned int status = readb(info->base + CUMANASCSI2_STATUS);262 263 if (status & STATUS_INT)264 return;265 266 if (!(status & STATUS_DRQ))267 continue;268 269 word = readw(info->base + CUMANASCSI2_PSEUDODMA);270 *addr++ = word;271 if (--length > 0) {272 *addr++ = word >> 8;273 length --;274 }275 }276 }277}278 279/* Prototype: int cumanascsi_2_dma_stop(host, SCpnt)280 * Purpose : stops DMA/PIO281 * Params : host - host282 * SCpnt - command283 */284static void285cumanascsi_2_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)286{287 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;288 if (info->info.scsi.dma != NO_DMA) {289 writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH);290 disable_dma(info->info.scsi.dma);291 }292}293 294/* Prototype: const char *cumanascsi_2_info(struct Scsi_Host * host)295 * Purpose : returns a descriptive string about this interface,296 * Params : host - driver host structure to return info for.297 * Returns : pointer to a static buffer containing null terminated string.298 */299static const char *cumanascsi_2_info(struct Scsi_Host *host)300{301 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;302 static char string[150];303 304 sprintf(string, "%s (%s) in slot %d v%s terminators o%s",305 host->hostt->name, info->info.scsi.type, info->ec->slot_no,306 VERSION, info->terms ? "n" : "ff");307 308 return string;309}310 311/* Prototype: int cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length)312 * Purpose : Set a driver specific function313 * Params : host - host to setup314 * : buffer - buffer containing string describing operation315 * : length - length of string316 * Returns : -EINVAL, or 0317 */318static int319cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length)320{321 int ret = length;322 323 if (length >= 11 && strncmp(buffer, "CUMANASCSI2", 11) == 0) {324 buffer += 11;325 length -= 11;326 327 if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {328 if (buffer[5] == '1')329 cumanascsi_2_terminator_ctl(host, 1);330 else if (buffer[5] == '0')331 cumanascsi_2_terminator_ctl(host, 0);332 else333 ret = -EINVAL;334 } else {335 ret = -EINVAL;336 }337 } else {338 ret = -EINVAL;339 }340 341 return ret;342}343 344static int cumanascsi_2_show_info(struct seq_file *m, struct Scsi_Host *host)345{346 struct cumanascsi2_info *info;347 info = (struct cumanascsi2_info *)host->hostdata;348 349 seq_printf(m, "Cumana SCSI II driver v%s\n", VERSION);350 fas216_print_host(&info->info, m);351 seq_printf(m, "Term : o%s\n",352 info->terms ? "n" : "ff");353 354 fas216_print_stats(&info->info, m);355 fas216_print_devices(&info->info, m);356 return 0;357}358 359static const struct scsi_host_template cumanascsi2_template = {360 .module = THIS_MODULE,361 .show_info = cumanascsi_2_show_info,362 .write_info = cumanascsi_2_set_proc_info,363 .name = "Cumana SCSI II",364 .info = cumanascsi_2_info,365 .queuecommand = fas216_queue_command,366 .eh_host_reset_handler = fas216_eh_host_reset,367 .eh_bus_reset_handler = fas216_eh_bus_reset,368 .eh_device_reset_handler = fas216_eh_device_reset,369 .eh_abort_handler = fas216_eh_abort,370 .cmd_size = sizeof(struct fas216_cmd_priv),371 .can_queue = 1,372 .this_id = 7,373 .sg_tablesize = SG_MAX_SEGMENTS,374 .dma_boundary = IOMD_DMA_BOUNDARY,375 .proc_name = "cumanascsi2",376};377 378static int cumanascsi2_probe(struct expansion_card *ec,379 const struct ecard_id *id)380{381 struct Scsi_Host *host;382 struct cumanascsi2_info *info;383 void __iomem *base;384 int ret;385 386 ret = ecard_request_resources(ec);387 if (ret)388 goto out;389 390 base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);391 if (!base) {392 ret = -ENOMEM;393 goto out_region;394 }395 396 host = scsi_host_alloc(&cumanascsi2_template,397 sizeof(struct cumanascsi2_info));398 if (!host) {399 ret = -ENOMEM;400 goto out_region;401 }402 403 ecard_set_drvdata(ec, host);404 405 info = (struct cumanascsi2_info *)host->hostdata;406 info->ec = ec;407 info->base = base;408 409 cumanascsi_2_terminator_ctl(host, term[ec->slot_no]);410 411 info->info.scsi.io_base = base + CUMANASCSI2_FAS216_OFFSET;412 info->info.scsi.io_shift = CUMANASCSI2_FAS216_SHIFT;413 info->info.scsi.irq = ec->irq;414 info->info.scsi.dma = ec->dma;415 info->info.ifcfg.clockrate = 40; /* MHz */416 info->info.ifcfg.select_timeout = 255;417 info->info.ifcfg.asyncperiod = 200; /* ns */418 info->info.ifcfg.sync_max_depth = 7;419 info->info.ifcfg.cntl3 = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;420 info->info.ifcfg.disconnect_ok = 1;421 info->info.ifcfg.wide_max_size = 0;422 info->info.ifcfg.capabilities = FASCAP_PSEUDODMA;423 info->info.dma.setup = cumanascsi_2_dma_setup;424 info->info.dma.pseudo = cumanascsi_2_dma_pseudo;425 info->info.dma.stop = cumanascsi_2_dma_stop;426 427 ec->irqaddr = info->base + CUMANASCSI2_STATUS;428 ec->irqmask = STATUS_INT;429 430 ecard_setirq(ec, &cumanascsi_2_ops, info);431 432 ret = fas216_init(host);433 if (ret)434 goto out_free;435 436 ret = request_irq(ec->irq, cumanascsi_2_intr,437 0, "cumanascsi2", info);438 if (ret) {439 printk("scsi%d: IRQ%d not free: %d\n",440 host->host_no, ec->irq, ret);441 goto out_release;442 }443 444 if (info->info.scsi.dma != NO_DMA) {445 if (request_dma(info->info.scsi.dma, "cumanascsi2")) {446 printk("scsi%d: DMA%d not free, using PIO\n",447 host->host_no, info->info.scsi.dma);448 info->info.scsi.dma = NO_DMA;449 } else {450 set_dma_speed(info->info.scsi.dma, 180);451 info->info.ifcfg.capabilities |= FASCAP_DMA;452 }453 }454 455 ret = fas216_add(host, &ec->dev);456 if (ret == 0)457 goto out;458 459 if (info->info.scsi.dma != NO_DMA)460 free_dma(info->info.scsi.dma);461 free_irq(ec->irq, info);462 463 out_release:464 fas216_release(host);465 466 out_free:467 scsi_host_put(host);468 469 out_region:470 ecard_release_resources(ec);471 472 out:473 return ret;474}475 476static void cumanascsi2_remove(struct expansion_card *ec)477{478 struct Scsi_Host *host = ecard_get_drvdata(ec);479 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;480 481 ecard_set_drvdata(ec, NULL);482 fas216_remove(host);483 484 if (info->info.scsi.dma != NO_DMA)485 free_dma(info->info.scsi.dma);486 free_irq(ec->irq, info);487 488 fas216_release(host);489 scsi_host_put(host);490 ecard_release_resources(ec);491}492 493static const struct ecard_id cumanascsi2_cids[] = {494 { MANU_CUMANA, PROD_CUMANA_SCSI_2 },495 { 0xffff, 0xffff },496};497 498static struct ecard_driver cumanascsi2_driver = {499 .probe = cumanascsi2_probe,500 .remove = cumanascsi2_remove,501 .id_table = cumanascsi2_cids,502 .drv = {503 .name = "cumanascsi2",504 },505};506 507static int __init cumanascsi2_init(void)508{509 return ecard_register_driver(&cumanascsi2_driver);510}511 512static void __exit cumanascsi2_exit(void)513{514 ecard_remove_driver(&cumanascsi2_driver);515}516 517module_init(cumanascsi2_init);518module_exit(cumanascsi2_exit);519 520MODULE_AUTHOR("Russell King");521MODULE_DESCRIPTION("Cumana SCSI-2 driver for Acorn machines");522module_param_array(term, int, NULL, 0);523MODULE_PARM_DESC(term, "SCSI bus termination");524MODULE_LICENSE("GPL");525