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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * linux/drivers/acorn/scsi/powertec.c4 *5 * Copyright (C) 1997-2005 Russell King6 */7#include <linux/module.h>8#include <linux/blkdev.h>9#include <linux/kernel.h>10#include <linux/string.h>11#include <linux/ioport.h>12#include <linux/proc_fs.h>13#include <linux/delay.h>14#include <linux/interrupt.h>15#include <linux/init.h>16#include <linux/dma-mapping.h>17#include <linux/pgtable.h>18 19#include <asm/dma.h>20#include <asm/ecard.h>21#include <asm/io.h>22 23#include <scsi/scsi.h>24#include <scsi/scsi_cmnd.h>25#include <scsi/scsi_device.h>26#include <scsi/scsi_eh.h>27#include <scsi/scsi_host.h>28#include <scsi/scsi_tcq.h>29#include "fas216.h"30#include "arm_scsi.h"31 32#include <scsi/scsicam.h>33 34#define POWERTEC_FAS216_OFFSET 0x300035#define POWERTEC_FAS216_SHIFT 636 37#define POWERTEC_INTR_STATUS 0x200038#define POWERTEC_INTR_BIT 0x8039 40#define POWERTEC_RESET_CONTROL 0x101841#define POWERTEC_RESET_BIT 142 43#define POWERTEC_TERM_CONTROL 0x201844#define POWERTEC_TERM_ENABLE 145 46#define POWERTEC_INTR_CONTROL 0x101c47#define POWERTEC_INTR_ENABLE 148#define POWERTEC_INTR_DISABLE 049 50#define VERSION "1.10 (19/01/2003 2.5.59)"51 52/*53 * Use term=0,1,0,0,0 to turn terminators on/off.54 * One entry per slot.55 */56static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };57 58#define NR_SG 25659 60struct powertec_info {61 FAS216_Info info;62 struct expansion_card *ec;63 void __iomem *base;64 unsigned int term_ctl;65 struct scatterlist sg[NR_SG];66};67 68/* Prototype: void powertecscsi_irqenable(ec, irqnr)69 * Purpose : Enable interrupts on Powertec SCSI card70 * Params : ec - expansion card structure71 * : irqnr - interrupt number72 */73static void74powertecscsi_irqenable(struct expansion_card *ec, int irqnr)75{76 struct powertec_info *info = ec->irq_data;77 writeb(POWERTEC_INTR_ENABLE, info->base + POWERTEC_INTR_CONTROL);78}79 80/* Prototype: void powertecscsi_irqdisable(ec, irqnr)81 * Purpose : Disable interrupts on Powertec SCSI card82 * Params : ec - expansion card structure83 * : irqnr - interrupt number84 */85static void86powertecscsi_irqdisable(struct expansion_card *ec, int irqnr)87{88 struct powertec_info *info = ec->irq_data;89 writeb(POWERTEC_INTR_DISABLE, info->base + POWERTEC_INTR_CONTROL);90}91 92static const expansioncard_ops_t powertecscsi_ops = {93 .irqenable = powertecscsi_irqenable,94 .irqdisable = powertecscsi_irqdisable,95};96 97/* Prototype: void powertecscsi_terminator_ctl(host, on_off)98 * Purpose : Turn the Powertec SCSI terminators on or off99 * Params : host - card to turn on/off100 * : on_off - !0 to turn on, 0 to turn off101 */102static void103powertecscsi_terminator_ctl(struct Scsi_Host *host, int on_off)104{105 struct powertec_info *info = (struct powertec_info *)host->hostdata;106 107 info->term_ctl = on_off ? POWERTEC_TERM_ENABLE : 0;108 writeb(info->term_ctl, info->base + POWERTEC_TERM_CONTROL);109}110 111/* Prototype: void powertecscsi_intr(irq, *dev_id, *regs)112 * Purpose : handle interrupts from Powertec SCSI card113 * Params : irq - interrupt number114 * dev_id - user-defined (Scsi_Host structure)115 */116static irqreturn_t powertecscsi_intr(int irq, void *dev_id)117{118 struct powertec_info *info = dev_id;119 120 return fas216_intr(&info->info);121}122 123/* Prototype: fasdmatype_t powertecscsi_dma_setup(host, SCpnt, direction, min_type)124 * Purpose : initialises DMA/PIO125 * Params : host - host126 * SCpnt - command127 * direction - DMA on to/off of card128 * min_type - minimum DMA support that we must have for this transfer129 * Returns : type of transfer to be performed130 */131static fasdmatype_t132powertecscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,133 fasdmadir_t direction, fasdmatype_t min_type)134{135 struct powertec_info *info = (struct powertec_info *)host->hostdata;136 struct device *dev = scsi_get_device(host);137 int dmach = info->info.scsi.dma;138 139 if (info->info.ifcfg.capabilities & FASCAP_DMA &&140 min_type == fasdma_real_all) {141 int bufs, map_dir, dma_dir;142 143 bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);144 145 if (direction == DMA_OUT) {146 map_dir = DMA_TO_DEVICE;147 dma_dir = DMA_MODE_WRITE;148 } else {149 map_dir = DMA_FROM_DEVICE;150 dma_dir = DMA_MODE_READ;151 }152 153 dma_map_sg(dev, info->sg, bufs, map_dir);154 155 disable_dma(dmach);156 set_dma_sg(dmach, info->sg, bufs);157 set_dma_mode(dmach, dma_dir);158 enable_dma(dmach);159 return fasdma_real_all;160 }161 162 /*163 * If we're not doing DMA,164 * we'll do slow PIO165 */166 return fasdma_pio;167}168 169/* Prototype: int powertecscsi_dma_stop(host, SCpnt)170 * Purpose : stops DMA/PIO171 * Params : host - host172 * SCpnt - command173 */174static void175powertecscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)176{177 struct powertec_info *info = (struct powertec_info *)host->hostdata;178 if (info->info.scsi.dma != NO_DMA)179 disable_dma(info->info.scsi.dma);180}181 182/* Prototype: const char *powertecscsi_info(struct Scsi_Host * host)183 * Purpose : returns a descriptive string about this interface,184 * Params : host - driver host structure to return info for.185 * Returns : pointer to a static buffer containing null terminated string.186 */187static const char *powertecscsi_info(struct Scsi_Host *host)188{189 struct powertec_info *info = (struct powertec_info *)host->hostdata;190 static char string[150];191 192 sprintf(string, "%s (%s) in slot %d v%s terminators o%s",193 host->hostt->name, info->info.scsi.type, info->ec->slot_no,194 VERSION, info->term_ctl ? "n" : "ff");195 196 return string;197}198 199/* Prototype: int powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)200 * Purpose : Set a driver specific function201 * Params : host - host to setup202 * : buffer - buffer containing string describing operation203 * : length - length of string204 * Returns : -EINVAL, or 0205 */206static int207powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)208{209 int ret = length;210 211 if (length >= 12 && strncmp(buffer, "POWERTECSCSI", 12) == 0) {212 buffer += 12;213 length -= 12;214 215 if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {216 if (buffer[5] == '1')217 powertecscsi_terminator_ctl(host, 1);218 else if (buffer[5] == '0')219 powertecscsi_terminator_ctl(host, 0);220 else221 ret = -EINVAL;222 } else223 ret = -EINVAL;224 } else225 ret = -EINVAL;226 227 return ret;228}229 230/* Prototype: int powertecscsi_proc_info(char *buffer, char **start, off_t offset,231 * int length, int host_no, int inout)232 * Purpose : Return information about the driver to a user process accessing233 * the /proc filesystem.234 * Params : buffer - a buffer to write information to235 * start - a pointer into this buffer set by this routine to the start236 * of the required information.237 * offset - offset into information that we have read up to.238 * length - length of buffer239 * inout - 0 for reading, 1 for writing.240 * Returns : length of data written to buffer.241 */242static int powertecscsi_show_info(struct seq_file *m, struct Scsi_Host *host)243{244 struct powertec_info *info;245 246 info = (struct powertec_info *)host->hostdata;247 248 seq_printf(m, "PowerTec SCSI driver v%s\n", VERSION);249 fas216_print_host(&info->info, m);250 seq_printf(m, "Term : o%s\n",251 info->term_ctl ? "n" : "ff");252 253 fas216_print_stats(&info->info, m);254 fas216_print_devices(&info->info, m);255 return 0;256}257 258static ssize_t powertecscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf)259{260 struct expansion_card *ec = ECARD_DEV(dev);261 struct Scsi_Host *host = ecard_get_drvdata(ec);262 struct powertec_info *info = (struct powertec_info *)host->hostdata;263 264 return sprintf(buf, "%d\n", info->term_ctl ? 1 : 0);265}266 267static ssize_t268powertecscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)269{270 struct expansion_card *ec = ECARD_DEV(dev);271 struct Scsi_Host *host = ecard_get_drvdata(ec);272 273 if (len > 1)274 powertecscsi_terminator_ctl(host, buf[0] != '0');275 276 return len;277}278 279static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR,280 powertecscsi_show_term, powertecscsi_store_term);281 282static const struct scsi_host_template powertecscsi_template = {283 .module = THIS_MODULE,284 .show_info = powertecscsi_show_info,285 .write_info = powertecscsi_set_proc_info,286 .name = "PowerTec SCSI",287 .info = powertecscsi_info,288 .queuecommand = fas216_queue_command,289 .eh_host_reset_handler = fas216_eh_host_reset,290 .eh_bus_reset_handler = fas216_eh_bus_reset,291 .eh_device_reset_handler = fas216_eh_device_reset,292 .eh_abort_handler = fas216_eh_abort,293 .cmd_size = sizeof(struct fas216_cmd_priv),294 .can_queue = 8,295 .this_id = 7,296 .sg_tablesize = SG_MAX_SEGMENTS,297 .dma_boundary = IOMD_DMA_BOUNDARY,298 .cmd_per_lun = 2,299 .proc_name = "powertec",300};301 302static int powertecscsi_probe(struct expansion_card *ec,303 const struct ecard_id *id)304{305 struct Scsi_Host *host;306 struct powertec_info *info;307 void __iomem *base;308 int ret;309 310 ret = ecard_request_resources(ec);311 if (ret)312 goto out;313 314 base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);315 if (!base) {316 ret = -ENOMEM;317 goto out_region;318 }319 320 host = scsi_host_alloc(&powertecscsi_template,321 sizeof (struct powertec_info));322 if (!host) {323 ret = -ENOMEM;324 goto out_region;325 }326 327 ecard_set_drvdata(ec, host);328 329 info = (struct powertec_info *)host->hostdata;330 info->base = base;331 powertecscsi_terminator_ctl(host, term[ec->slot_no]);332 333 info->ec = ec;334 info->info.scsi.io_base = base + POWERTEC_FAS216_OFFSET;335 info->info.scsi.io_shift = POWERTEC_FAS216_SHIFT;336 info->info.scsi.irq = ec->irq;337 info->info.scsi.dma = ec->dma;338 info->info.ifcfg.clockrate = 40; /* MHz */339 info->info.ifcfg.select_timeout = 255;340 info->info.ifcfg.asyncperiod = 200; /* ns */341 info->info.ifcfg.sync_max_depth = 7;342 info->info.ifcfg.cntl3 = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;343 info->info.ifcfg.disconnect_ok = 1;344 info->info.ifcfg.wide_max_size = 0;345 info->info.ifcfg.capabilities = 0;346 info->info.dma.setup = powertecscsi_dma_setup;347 info->info.dma.pseudo = NULL;348 info->info.dma.stop = powertecscsi_dma_stop;349 350 ec->irqaddr = base + POWERTEC_INTR_STATUS;351 ec->irqmask = POWERTEC_INTR_BIT;352 353 ecard_setirq(ec, &powertecscsi_ops, info);354 355 device_create_file(&ec->dev, &dev_attr_bus_term);356 357 ret = fas216_init(host);358 if (ret)359 goto out_free;360 361 ret = request_irq(ec->irq, powertecscsi_intr,362 0, "powertec", info);363 if (ret) {364 printk("scsi%d: IRQ%d not free: %d\n",365 host->host_no, ec->irq, ret);366 goto out_release;367 }368 369 if (info->info.scsi.dma != NO_DMA) {370 if (request_dma(info->info.scsi.dma, "powertec")) {371 printk("scsi%d: DMA%d not free, using PIO\n",372 host->host_no, info->info.scsi.dma);373 info->info.scsi.dma = NO_DMA;374 } else {375 set_dma_speed(info->info.scsi.dma, 180);376 info->info.ifcfg.capabilities |= FASCAP_DMA;377 }378 }379 380 ret = fas216_add(host, &ec->dev);381 if (ret == 0)382 goto out;383 384 if (info->info.scsi.dma != NO_DMA)385 free_dma(info->info.scsi.dma);386 free_irq(ec->irq, info);387 388 out_release:389 fas216_release(host);390 391 out_free:392 device_remove_file(&ec->dev, &dev_attr_bus_term);393 scsi_host_put(host);394 395 out_region:396 ecard_release_resources(ec);397 398 out:399 return ret;400}401 402static void powertecscsi_remove(struct expansion_card *ec)403{404 struct Scsi_Host *host = ecard_get_drvdata(ec);405 struct powertec_info *info = (struct powertec_info *)host->hostdata;406 407 ecard_set_drvdata(ec, NULL);408 fas216_remove(host);409 410 device_remove_file(&ec->dev, &dev_attr_bus_term);411 412 if (info->info.scsi.dma != NO_DMA)413 free_dma(info->info.scsi.dma);414 free_irq(ec->irq, info);415 416 fas216_release(host);417 scsi_host_put(host);418 ecard_release_resources(ec);419}420 421static const struct ecard_id powertecscsi_cids[] = {422 { MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI },423 { 0xffff, 0xffff },424};425 426static struct ecard_driver powertecscsi_driver = {427 .probe = powertecscsi_probe,428 .remove = powertecscsi_remove,429 .id_table = powertecscsi_cids,430 .drv = {431 .name = "powertecscsi",432 },433};434 435static int __init powertecscsi_init(void)436{437 return ecard_register_driver(&powertecscsi_driver);438}439 440static void __exit powertecscsi_exit(void)441{442 ecard_remove_driver(&powertecscsi_driver);443}444 445module_init(powertecscsi_init);446module_exit(powertecscsi_exit);447 448MODULE_AUTHOR("Russell King");449MODULE_DESCRIPTION("Powertec SCSI driver");450module_param_array(term, int, NULL, 0);451MODULE_PARM_DESC(term, "SCSI bus termination");452MODULE_LICENSE("GPL");453