linux/drivers/scsi/arm/cumana_2.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  linux/drivers/acorn/scsi/cumana_2.c
   4 *
   5 *  Copyright (C) 1997-2005 Russell King
   6 *
   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.h
  13 *   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.h"
  33#include <scsi/scsi_host.h>
  34#include "fas216.h"
  35#include "scsi.h"
  36
  37#include <scsi/scsicam.h>
  38
  39#define CUMANASCSI2_STATUS              (0x0000)
  40#define STATUS_INT                      (1 << 0)
  41#define STATUS_DRQ                      (1 << 1)
  42#define STATUS_LATCHED                  (1 << 3)
  43
  44#define CUMANASCSI2_ALATCH              (0x0014)
  45#define ALATCH_ENA_INT                  (3)
  46#define ALATCH_DIS_INT                  (2)
  47#define ALATCH_ENA_TERM                 (5)
  48#define ALATCH_DIS_TERM                 (4)
  49#define ALATCH_ENA_BIT32                (11)
  50#define ALATCH_DIS_BIT32                (10)
  51#define ALATCH_ENA_DMA                  (13)
  52#define ALATCH_DIS_DMA                  (12)
  53#define ALATCH_DMA_OUT                  (15)
  54#define ALATCH_DMA_IN                   (14)
  55
  56#define CUMANASCSI2_PSEUDODMA           (0x0200)
  57
  58#define CUMANASCSI2_FAS216_OFFSET       (0x0300)
  59#define CUMANASCSI2_FAS216_SHIFT        2
  60
  61/*
  62 * Version
  63 */
  64#define VERSION "1.00 (13/11/2002 2.5.47)"
  65
  66/*
  67 * Use term=0,1,0,0,0 to turn terminators on/off
  68 */
  69static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
  70
  71#define NR_SG   256
  72
  73struct cumanascsi2_info {
  74        FAS216_Info             info;
  75        struct expansion_card   *ec;
  76        void __iomem            *base;
  77        unsigned int            terms;          /* Terminator state     */
  78        struct scatterlist      sg[NR_SG];      /* Scatter DMA list     */
  79};
  80
  81#define CSTATUS_IRQ     (1 << 0)
  82#define CSTATUS_DRQ     (1 << 1)
  83
  84/* Prototype: void cumanascsi_2_irqenable(ec, irqnr)
  85 * Purpose  : Enable interrupts on Cumana SCSI 2 card
  86 * Params   : ec    - expansion card structure
  87 *          : irqnr - interrupt number
  88 */
  89static void
  90cumanascsi_2_irqenable(struct expansion_card *ec, int irqnr)
  91{
  92        struct cumanascsi2_info *info = ec->irq_data;
  93        writeb(ALATCH_ENA_INT, info->base + CUMANASCSI2_ALATCH);
  94}
  95
  96/* Prototype: void cumanascsi_2_irqdisable(ec, irqnr)
  97 * Purpose  : Disable interrupts on Cumana SCSI 2 card
  98 * Params   : ec    - expansion card structure
  99 *          : irqnr - interrupt number
 100 */
 101static void
 102cumanascsi_2_irqdisable(struct expansion_card *ec, int irqnr)
 103{
 104        struct cumanascsi2_info *info = ec->irq_data;
 105        writeb(ALATCH_DIS_INT, info->base + CUMANASCSI2_ALATCH);
 106}
 107
 108static const expansioncard_ops_t cumanascsi_2_ops = {
 109        .irqenable      = cumanascsi_2_irqenable,
 110        .irqdisable     = cumanascsi_2_irqdisable,
 111};
 112
 113/* Prototype: void cumanascsi_2_terminator_ctl(host, on_off)
 114 * Purpose  : Turn the Cumana SCSI 2 terminators on or off
 115 * Params   : host   - card to turn on/off
 116 *          : on_off - !0 to turn on, 0 to turn off
 117 */
 118static void
 119cumanascsi_2_terminator_ctl(struct Scsi_Host *host, int on_off)
 120{
 121        struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
 122
 123        if (on_off) {
 124                info->terms = 1;
 125                writeb(ALATCH_ENA_TERM, info->base + CUMANASCSI2_ALATCH);
 126        } else {
 127                info->terms = 0;
 128                writeb(ALATCH_DIS_TERM, info->base + CUMANASCSI2_ALATCH);
 129        }
 130}
 131
 132/* Prototype: void cumanascsi_2_intr(irq, *dev_id, *regs)
 133 * Purpose  : handle interrupts from Cumana SCSI 2 card
 134 * Params   : irq    - interrupt number
 135 *            dev_id - user-defined (Scsi_Host structure)
 136 */
 137static irqreturn_t
 138cumanascsi_2_intr(int irq, void *dev_id)
 139{
 140        struct cumanascsi2_info *info = dev_id;
 141
 142        return fas216_intr(&info->info);
 143}
 144
 145/* Prototype: fasdmatype_t cumanascsi_2_dma_setup(host, SCpnt, direction, min_type)
 146 * Purpose  : initialises DMA/PIO
 147 * Params   : host      - host
 148 *            SCpnt     - command
 149 *            direction - DMA on to/off of card
 150 *            min_type  - minimum DMA support that we must have for this transfer
 151 * Returns  : type of transfer to be performed
 152 */
 153static fasdmatype_t
 154cumanascsi_2_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
 155                       fasdmadir_t direction, fasdmatype_t min_type)
 156{
 157        struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
 158        struct device *dev = scsi_get_device(host);
 159        int dmach = info->info.scsi.dma;
 160
 161        writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH);
 162
 163        if (dmach != NO_DMA &&
 164            (min_type == fasdma_real_all || SCp->this_residual >= 512)) {
 165                int bufs, map_dir, dma_dir, alatch_dir;
 166
 167                bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
 168
 169                if (direction == DMA_OUT) {
 170                        map_dir = DMA_TO_DEVICE;
 171                        dma_dir = DMA_MODE_WRITE;
 172                        alatch_dir = ALATCH_DMA_OUT;
 173                } else {
 174                        map_dir = DMA_FROM_DEVICE;
 175                        dma_dir = DMA_MODE_READ;
 176                        alatch_dir = ALATCH_DMA_IN;
 177                }
 178
 179                dma_map_sg(dev, info->sg, bufs, map_dir);
 180
 181                disable_dma(dmach);
 182                set_dma_sg(dmach, info->sg, bufs);
 183                writeb(alatch_dir, info->base + CUMANASCSI2_ALATCH);
 184                set_dma_mode(dmach, dma_dir);
 185                enable_dma(dmach);
 186                writeb(ALATCH_ENA_DMA, info->base + CUMANASCSI2_ALATCH);
 187                writeb(ALATCH_DIS_BIT32, info->base + CUMANASCSI2_ALATCH);
 188                return fasdma_real_all;
 189        }
 190
 191        /*
 192         * If we're not doing DMA,
 193         *  we'll do pseudo DMA
 194         */
 195        return fasdma_pio;
 196}
 197
 198/*
 199 * Prototype: void cumanascsi_2_dma_pseudo(host, SCpnt, direction, transfer)
 200 * Purpose  : handles pseudo DMA
 201 * Params   : host      - host
 202 *            SCpnt     - command
 203 *            direction - DMA on to/off of card
 204 *            transfer  - minimum number of bytes we expect to transfer
 205 */
 206static void
 207cumanascsi_2_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,
 208                        fasdmadir_t direction, int transfer)
 209{
 210        struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
 211        unsigned int length;
 212        unsigned char *addr;
 213
 214        length = SCp->this_residual;
 215        addr = SCp->ptr;
 216
 217        if (direction == DMA_OUT)
 218#if 0
 219                while (length > 1) {
 220                        unsigned long word;
 221                        unsigned int status = readb(info->base + CUMANASCSI2_STATUS);
 222
 223                        if (status & STATUS_INT)
 224                                goto end;
 225
 226                        if (!(status & STATUS_DRQ))
 227                                continue;
 228
 229                        word = *addr | *(addr + 1) << 8;
 230                        writew(word, info->base + CUMANASCSI2_PSEUDODMA);
 231                        addr += 2;
 232                        length -= 2;
 233                }
 234#else
 235                printk ("PSEUDO_OUT???\n");
 236#endif
 237        else {
 238                if (transfer && (transfer & 255)) {
 239                        while (length >= 256) {
 240                                unsigned int status = readb(info->base + CUMANASCSI2_STATUS);
 241
 242                                if (status & STATUS_INT)
 243                                        return;
 244            
 245                                if (!(status & STATUS_DRQ))
 246                                        continue;
 247
 248                                readsw(info->base + CUMANASCSI2_PSEUDODMA,
 249                                       addr, 256 >> 1);
 250                                addr += 256;
 251                                length -= 256;
 252                        }
 253                }
 254
 255                while (length > 0) {
 256                        unsigned long word;
 257                        unsigned int status = readb(info->base + CUMANASCSI2_STATUS);
 258
 259                        if (status & STATUS_INT)
 260                                return;
 261
 262                        if (!(status & STATUS_DRQ))
 263                                continue;
 264
 265                        word = readw(info->base + CUMANASCSI2_PSEUDODMA);
 266                        *addr++ = word;
 267                        if (--length > 0) {
 268                                *addr++ = word >> 8;
 269                                length --;
 270                        }
 271                }
 272        }
 273}
 274
 275/* Prototype: int cumanascsi_2_dma_stop(host, SCpnt)
 276 * Purpose  : stops DMA/PIO
 277 * Params   : host  - host
 278 *            SCpnt - command
 279 */
 280static void
 281cumanascsi_2_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
 282{
 283        struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
 284        if (info->info.scsi.dma != NO_DMA) {
 285                writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH);
 286                disable_dma(info->info.scsi.dma);
 287        }
 288}
 289
 290/* Prototype: const char *cumanascsi_2_info(struct Scsi_Host * host)
 291 * Purpose  : returns a descriptive string about this interface,
 292 * Params   : host - driver host structure to return info for.
 293 * Returns  : pointer to a static buffer containing null terminated string.
 294 */
 295const char *cumanascsi_2_info(struct Scsi_Host *host)
 296{
 297        struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
 298        static char string[150];
 299
 300        sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
 301                host->hostt->name, info->info.scsi.type, info->ec->slot_no,
 302                VERSION, info->terms ? "n" : "ff");
 303
 304        return string;
 305}
 306
 307/* Prototype: int cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
 308 * Purpose  : Set a driver specific function
 309 * Params   : host   - host to setup
 310 *          : buffer - buffer containing string describing operation
 311 *          : length - length of string
 312 * Returns  : -EINVAL, or 0
 313 */
 314static int
 315cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
 316{
 317        int ret = length;
 318
 319        if (length >= 11 && strncmp(buffer, "CUMANASCSI2", 11) == 0) {
 320                buffer += 11;
 321                length -= 11;
 322
 323                if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
 324                        if (buffer[5] == '1')
 325                                cumanascsi_2_terminator_ctl(host, 1);
 326                        else if (buffer[5] == '0')
 327                                cumanascsi_2_terminator_ctl(host, 0);
 328                        else
 329                                ret = -EINVAL;
 330                } else {
 331                        ret = -EINVAL;
 332                }
 333        } else {
 334                ret = -EINVAL;
 335        }
 336
 337        return ret;
 338}
 339
 340static int cumanascsi_2_show_info(struct seq_file *m, struct Scsi_Host *host)
 341{
 342        struct cumanascsi2_info *info;
 343        info = (struct cumanascsi2_info *)host->hostdata;
 344
 345        seq_printf(m, "Cumana SCSI II driver v%s\n", VERSION);
 346        fas216_print_host(&info->info, m);
 347        seq_printf(m, "Term    : o%s\n",
 348                        info->terms ? "n" : "ff");
 349
 350        fas216_print_stats(&info->info, m);
 351        fas216_print_devices(&info->info, m);
 352        return 0;
 353}
 354
 355static struct scsi_host_template cumanascsi2_template = {
 356        .module                         = THIS_MODULE,
 357        .show_info                      = cumanascsi_2_show_info,
 358        .write_info                     = cumanascsi_2_set_proc_info,
 359        .name                           = "Cumana SCSI II",
 360        .info                           = cumanascsi_2_info,
 361        .queuecommand                   = fas216_queue_command,
 362        .eh_host_reset_handler          = fas216_eh_host_reset,
 363        .eh_bus_reset_handler           = fas216_eh_bus_reset,
 364        .eh_device_reset_handler        = fas216_eh_device_reset,
 365        .eh_abort_handler               = fas216_eh_abort,
 366        .can_queue                      = 1,
 367        .this_id                        = 7,
 368        .sg_tablesize                   = SG_MAX_SEGMENTS,
 369        .dma_boundary                   = IOMD_DMA_BOUNDARY,
 370        .proc_name                      = "cumanascsi2",
 371};
 372
 373static int cumanascsi2_probe(struct expansion_card *ec,
 374                             const struct ecard_id *id)
 375{
 376        struct Scsi_Host *host;
 377        struct cumanascsi2_info *info;
 378        void __iomem *base;
 379        int ret;
 380
 381        ret = ecard_request_resources(ec);
 382        if (ret)
 383                goto out;
 384
 385        base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
 386        if (!base) {
 387                ret = -ENOMEM;
 388                goto out_region;
 389        }
 390
 391        host = scsi_host_alloc(&cumanascsi2_template,
 392                               sizeof(struct cumanascsi2_info));
 393        if (!host) {
 394                ret = -ENOMEM;
 395                goto out_region;
 396        }
 397
 398        ecard_set_drvdata(ec, host);
 399
 400        info = (struct cumanascsi2_info *)host->hostdata;
 401        info->ec        = ec;
 402        info->base      = base;
 403
 404        cumanascsi_2_terminator_ctl(host, term[ec->slot_no]);
 405
 406        info->info.scsi.io_base         = base + CUMANASCSI2_FAS216_OFFSET;
 407        info->info.scsi.io_shift        = CUMANASCSI2_FAS216_SHIFT;
 408        info->info.scsi.irq             = ec->irq;
 409        info->info.scsi.dma             = ec->dma;
 410        info->info.ifcfg.clockrate      = 40; /* MHz */
 411        info->info.ifcfg.select_timeout = 255;
 412        info->info.ifcfg.asyncperiod    = 200; /* ns */
 413        info->info.ifcfg.sync_max_depth = 7;
 414        info->info.ifcfg.cntl3          = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
 415        info->info.ifcfg.disconnect_ok  = 1;
 416        info->info.ifcfg.wide_max_size  = 0;
 417        info->info.ifcfg.capabilities   = FASCAP_PSEUDODMA;
 418        info->info.dma.setup            = cumanascsi_2_dma_setup;
 419        info->info.dma.pseudo           = cumanascsi_2_dma_pseudo;
 420        info->info.dma.stop             = cumanascsi_2_dma_stop;
 421
 422        ec->irqaddr     = info->base + CUMANASCSI2_STATUS;
 423        ec->irqmask     = STATUS_INT;
 424
 425        ecard_setirq(ec, &cumanascsi_2_ops, info);
 426
 427        ret = fas216_init(host);
 428        if (ret)
 429                goto out_free;
 430
 431        ret = request_irq(ec->irq, cumanascsi_2_intr,
 432                          0, "cumanascsi2", info);
 433        if (ret) {
 434                printk("scsi%d: IRQ%d not free: %d\n",
 435                       host->host_no, ec->irq, ret);
 436                goto out_release;
 437        }
 438
 439        if (info->info.scsi.dma != NO_DMA) {
 440                if (request_dma(info->info.scsi.dma, "cumanascsi2")) {
 441                        printk("scsi%d: DMA%d not free, using PIO\n",
 442                               host->host_no, info->info.scsi.dma);
 443                        info->info.scsi.dma = NO_DMA;
 444                } else {
 445                        set_dma_speed(info->info.scsi.dma, 180);
 446                        info->info.ifcfg.capabilities |= FASCAP_DMA;
 447                }
 448        }
 449
 450        ret = fas216_add(host, &ec->dev);
 451        if (ret == 0)
 452                goto out;
 453
 454        if (info->info.scsi.dma != NO_DMA)
 455                free_dma(info->info.scsi.dma);
 456        free_irq(ec->irq, info);
 457
 458 out_release:
 459        fas216_release(host);
 460
 461 out_free:
 462        scsi_host_put(host);
 463
 464 out_region:
 465        ecard_release_resources(ec);
 466
 467 out:
 468        return ret;
 469}
 470
 471static void cumanascsi2_remove(struct expansion_card *ec)
 472{
 473        struct Scsi_Host *host = ecard_get_drvdata(ec);
 474        struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
 475
 476        ecard_set_drvdata(ec, NULL);
 477        fas216_remove(host);
 478
 479        if (info->info.scsi.dma != NO_DMA)
 480                free_dma(info->info.scsi.dma);
 481        free_irq(ec->irq, info);
 482
 483        fas216_release(host);
 484        scsi_host_put(host);
 485        ecard_release_resources(ec);
 486}
 487
 488static const struct ecard_id cumanascsi2_cids[] = {
 489        { MANU_CUMANA, PROD_CUMANA_SCSI_2 },
 490        { 0xffff, 0xffff },
 491};
 492
 493static struct ecard_driver cumanascsi2_driver = {
 494        .probe          = cumanascsi2_probe,
 495        .remove         = cumanascsi2_remove,
 496        .id_table       = cumanascsi2_cids,
 497        .drv = {
 498                .name           = "cumanascsi2",
 499        },
 500};
 501
 502static int __init cumanascsi2_init(void)
 503{
 504        return ecard_register_driver(&cumanascsi2_driver);
 505}
 506
 507static void __exit cumanascsi2_exit(void)
 508{
 509        ecard_remove_driver(&cumanascsi2_driver);
 510}
 511
 512module_init(cumanascsi2_init);
 513module_exit(cumanascsi2_exit);
 514
 515MODULE_AUTHOR("Russell King");
 516MODULE_DESCRIPTION("Cumana SCSI-2 driver for Acorn machines");
 517module_param_array(term, int, NULL, 0);
 518MODULE_PARM_DESC(term, "SCSI bus termination");
 519MODULE_LICENSE("GPL");
 520