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   1 /*
   2  *  linux/drivers/acorn/scsi/cumana_2.c
   3  *
   4  *  Copyright (C) 1997-2005 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  Changelog:
  11  *   30-08-1997 RMK     0.0.0   Created, READONLY version.
  12  *   22-01-1998 RMK     0.0.1   Updated to 2.1.80.
  13  *   15-04-1998 RMK     0.0.1   Only do PIO if FAS216 will allow it.
  14  *   02-05-1998 RMK     0.0.2   Updated & added DMA support.
  15  *   27-06-1998 RMK             Changed asm/delay.h to linux/delay.h
  16  *   18-08-1998 RMK     0.0.3   Fixed synchronous transfer depth.
  17  *   02-04-2000 RMK     0.0.4   Updated for new error handling code.
  18  */
  19 #include <linux/module.h>
  20 #include <linux/blkdev.h>
  21 #include <linux/kernel.h>
  22 #include <linux/string.h>
  23 #include <linux/ioport.h>
  24 #include <linux/proc_fs.h>
  25 #include <linux/delay.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/init.h>
  28 #include <linux/dma-mapping.h>
  29
  30 #include <asm/dma.h>
  31 #include <asm/ecard.h>
  32 #include <asm/io.h>
  33 #include <asm/pgtable.h>
  34
  35 #include "../scsi.h"
  36 #include <scsi/scsi_host.h>
  37 #include "fas216.h"
  38 #include "scsi.h"
  39
  40 #include <scsi/scsicam.h>
  41
  42 #define CUMANASCSI2_STATUS              (0x0000)
  43 #define STATUS_INT                      (1 << 0)
  44 #define STATUS_DRQ                      (1 << 1)
  45 #define STATUS_LATCHED                  (1 << 3)
  46
  47 #define CUMANASCSI2_ALATCH              (0x0014)
  48 #define ALATCH_ENA_INT                  (3)
  49 #define ALATCH_DIS_INT                  (2)
  50 #define ALATCH_ENA_TERM                 (5)
  51 #define ALATCH_DIS_TERM                 (4)
  52 #define ALATCH_ENA_BIT32                (11)
  53 #define ALATCH_DIS_BIT32                (10)
  54 #define ALATCH_ENA_DMA                  (13)
  55 #define ALATCH_DIS_DMA                  (12)
  56 #define ALATCH_DMA_OUT                  (15)
  57 #define ALATCH_DMA_IN                   (14)
  58
  59 #define CUMANASCSI2_PSEUDODMA           (0x0200)
  60
  61 #define CUMANASCSI2_FAS216_OFFSET       (0x0300)
  62 #define CUMANASCSI2_FAS216_SHIFT        2
  63
  64 /*
  65  * Version
  66  */
  67 #define VERSION "1.00 (13/11/2002 2.5.47)"
  68
  69 /*
  70  * Use term=0,1,0,0,0 to turn terminators on/off
  71  */
  72 static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
  73
  74 #define NR_SG   256
  75
  76 struct cumanascsi2_info {
  77         FAS216_Info             info;
  78         struct expansion_card   *ec;
  79         void __iomem            *base;
  80         unsigned int            terms;          /* Terminator state     */
  81         struct scatterlist      sg[NR_SG];      /* Scatter DMA list     */
  82 };
  83
  84 #define CSTATUS_IRQ     (1 << 0)
  85 #define CSTATUS_DRQ     (1 << 1)
  86
  87 /* Prototype: void cumanascsi_2_irqenable(ec, irqnr)
  88  * Purpose  : Enable interrupts on Cumana SCSI 2 card
  89  * Params   : ec    - expansion card structure
  90  *          : irqnr - interrupt number
  91  */
  92 static void
  93 cumanascsi_2_irqenable(struct expansion_card *ec, int irqnr)
  94 {
  95         struct cumanascsi2_info *info = ec->irq_data;
  96         writeb(ALATCH_ENA_INT, info->base + CUMANASCSI2_ALATCH);
  97 }
  98
  99 /* Prototype: void cumanascsi_2_irqdisable(ec, irqnr)
 100  * Purpose  : Disable interrupts on Cumana SCSI 2 card
 101  * Params   : ec    - expansion card structure
 102  *          : irqnr - interrupt number
 103  */
 104 static void
 105 cumanascsi_2_irqdisable(struct expansion_card *ec, int irqnr)
 106 {
 107         struct cumanascsi2_info *info = ec->irq_data;
 108         writeb(ALATCH_DIS_INT, info->base + CUMANASCSI2_ALATCH);
 109 }
 110
 111 static const expansioncard_ops_t cumanascsi_2_ops = {
 112         .irqenable      = cumanascsi_2_irqenable,
 113         .irqdisable     = cumanascsi_2_irqdisable,
 114 };
 115
 116 /* Prototype: void cumanascsi_2_terminator_ctl(host, on_off)
 117  * Purpose  : Turn the Cumana SCSI 2 terminators on or off
 118  * Params   : host   - card to turn on/off
 119  *          : on_off - !0 to turn on, 0 to turn off
 120  */
 121 static void
 122 cumanascsi_2_terminator_ctl(struct Scsi_Host *host, int on_off)
 123 {
 124         struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
 125
 126         if (on_off) {
 127                 info->terms = 1;
 128                 writeb(ALATCH_ENA_TERM, info->base + CUMANASCSI2_ALATCH);
 129         } else {
 130                 info->terms = 0;
 131                 writeb(ALATCH_DIS_TERM, info->base + CUMANASCSI2_ALATCH);
 132         }
 133 }
 134
 135 /* Prototype: void cumanascsi_2_intr(irq, *dev_id, *regs)
 136  * Purpose  : handle interrupts from Cumana SCSI 2 card
 137  * Params   : irq    - interrupt number
 138  *            dev_id - user-defined (Scsi_Host structure)
 139  */
 140 static irqreturn_t
 141 cumanascsi_2_intr(int irq, void *dev_id)
 142 {
 143         struct cumanascsi2_info *info = dev_id;
 144
 145         return fas216_intr(&info->info);
 146 }
 147
 148 /* Prototype: fasdmatype_t cumanascsi_2_dma_setup(host, SCpnt, direction, min_type)
 149  * Purpose  : initialises DMA/PIO
 150  * Params   : host      - host
 151  *            SCpnt     - command
 152  *            direction - DMA on to/off of card
 153  *            min_type  - minimum DMA support that we must have for this transfer
 154  * Returns  : type of transfer to be performed
 155  */
 156 static fasdmatype_t
 157 cumanascsi_2_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
 158                        fasdmadir_t direction, fasdmatype_t min_type)
 159 {
 160         struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
 161         struct device *dev = scsi_get_device(host);
 162         int dmach = info->info.scsi.dma;
 163
 164         writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH);
 165
 166         if (dmach != NO_DMA &&
 167             (min_type == fasdma_real_all || SCp->this_residual >= 512)) {
 168                 int bufs, map_dir, dma_dir, alatch_dir;
 169
 170                 bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
 171
 172                 if (direction == DMA_OUT)
 173                         map_dir = DMA_TO_DEVICE,
 174                         dma_dir = DMA_MODE_WRITE,
 175                         alatch_dir = ALATCH_DMA_OUT;
 176                 else
 177                         map_dir = DMA_FROM_DEVICE,
 178                         dma_dir = DMA_MODE_READ,
 179                         alatch_dir = ALATCH_DMA_IN;
 180
 181                 dma_map_sg(dev, info->sg, bufs + 1, map_dir);
 182
 183                 disable_dma(dmach);
 184                 set_dma_sg(dmach, info->sg, bufs + 1);
 185                 writeb(alatch_dir, info->base + CUMANASCSI2_ALATCH);
 186                 set_dma_mode(dmach, dma_dir);
 187                 enable_dma(dmach);
 188                 writeb(ALATCH_ENA_DMA, info->base + CUMANASCSI2_ALATCH);
 189                 writeb(ALATCH_DIS_BIT32, info->base + CUMANASCSI2_ALATCH);
 190                 return fasdma_real_all;
 191         }
 192
 193         /*
 194          * If we're not doing DMA,
 195          *  we'll do pseudo DMA
 196          */
 197         return fasdma_pio;
 198 }
 199
 200 /*
 201  * Prototype: void cumanascsi_2_dma_pseudo(host, SCpnt, direction, transfer)
 202  * Purpose  : handles pseudo DMA
 203  * Params   : host      - host
 204  *            SCpnt     - command
 205  *            direction - DMA on to/off of card
 206  *            transfer  - minimum number of bytes we expect to transfer
 207  */
 208 static void
 209 cumanascsi_2_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,
 210                         fasdmadir_t direction, int transfer)
 211 {
 212         struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
 213         unsigned int length;
 214         unsigned char *addr;
 215
 216         length = SCp->this_residual;
 217         addr = SCp->ptr;
 218
 219         if (direction == DMA_OUT)
 220 #if 0
 221                 while (length > 1) {
 222                         unsigned long word;
 223                         unsigned int status = readb(info->base + CUMANASCSI2_STATUS);
 224
 225                         if (status & STATUS_INT)
 226                                 goto end;
 227
 228                         if (!(status & STATUS_DRQ))
 229                                 continue;
 230
 231                         word = *addr | *(addr + 1) << 8;
 232                         writew(word, info->base + CUMANASCSI2_PSEUDODMA);
 233                         addr += 2;
 234                         length -= 2;
 235                 }
 236 #else
 237                 printk ("PSEUDO_OUT???\n");
 238 #endif
 239         else {
 240                 if (transfer && (transfer & 255)) {
 241                         while (length >= 256) {
 242                                 unsigned int status = readb(info->base + CUMANASCSI2_STATUS);
 243
 244                                 if (status & STATUS_INT)
 245                                         return;
 246
 247                                 if (!(status & STATUS_DRQ))
 248                                         continue;
 249
 250                                 readsw(info->base + CUMANASCSI2_PSEUDODMA,
 251                                        addr, 256 >> 1);
 252                                 addr += 256;
 253                                 length -= 256;
 254                         }
 255                 }
 256
 257                 while (length > 0) {
 258                         unsigned long word;
 259                         unsigned int status = readb(info->base + CUMANASCSI2_STATUS);
 260
 261                         if (status & STATUS_INT)
 262                                 return;
 263
 264                         if (!(status & STATUS_DRQ))
 265                                 continue;
 266
 267                         word = readw(info->base + CUMANASCSI2_PSEUDODMA);
 268                         *addr++ = word;
 269                         if (--length > 0) {
 270                                 *addr++ = word >> 8;
 271                                 length --;
 272                         }
 273                 }
 274         }
 275 }
 276
 277 /* Prototype: int cumanascsi_2_dma_stop(host, SCpnt)
 278  * Purpose  : stops DMA/PIO
 279  * Params   : host  - host
 280  *            SCpnt - command
 281  */
 282 static void
 283 cumanascsi_2_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
 284 {
 285         struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
 286         if (info->info.scsi.dma != NO_DMA) {
 287                 writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH);
 288                 disable_dma(info->info.scsi.dma);
 289         }
 290 }
 291
 292 /* Prototype: const char *cumanascsi_2_info(struct Scsi_Host * host)
 293  * Purpose  : returns a descriptive string about this interface,
 294  * Params   : host - driver host structure to return info for.
 295  * Returns  : pointer to a static buffer containing null terminated string.
 296  */
 297 const char *cumanascsi_2_info(struct Scsi_Host *host)
 298 {
 299         struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
 300         static char string[150];
 301
 302         sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
 303                 host->hostt->name, info->info.scsi.type, info->ec->slot_no,
 304                 VERSION, info->terms ? "n" : "ff");
 305
 306         return string;
 307 }
 308
 309 /* Prototype: int cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
 310  * Purpose  : Set a driver specific function
 311  * Params   : host   - host to setup
 312  *          : buffer - buffer containing string describing operation
 313  *          : length - length of string
 314  * Returns  : -EINVAL, or 0
 315  */
 316 static int
 317 cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
 318 {
 319         int ret = length;
 320
 321         if (length >= 11 && strcmp(buffer, "CUMANASCSI2") == 0) {
 322                 buffer += 11;
 323                 length -= 11;
 324
 325                 if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
 326                         if (buffer[5] == '1')
 327                                 cumanascsi_2_terminator_ctl(host, 1);
 328                         else if (buffer[5] == '0')
 329                                 cumanascsi_2_terminator_ctl(host, 0);
 330                         else
 331                                 ret = -EINVAL;
 332                 } else
 333                         ret = -EINVAL;
 334         } else
 335                 ret = -EINVAL;
 336
 337         return ret;
 338 }
 339
 340 /* Prototype: int cumanascsi_2_proc_info(char *buffer, char **start, off_t offset,
 341  *                                       int length, int host_no, int inout)
 342  * Purpose  : Return information about the driver to a user process accessing
 343  *            the /proc filesystem.
 344  * Params   : buffer - a buffer to write information to
 345  *            start  - a pointer into this buffer set by this routine to the start
 346  *                     of the required information.
 347  *            offset - offset into information that we have read upto.
 348  *            length - length of buffer
 349  *            host_no - host number to return information for
 350  *            inout  - 0 for reading, 1 for writing.
 351  * Returns  : length of data written to buffer.
 352  */
 353 int cumanascsi_2_proc_info (struct Scsi_Host *host, char *buffer, char **start, off_t offset,
 354                             int length, int inout)
 355 {
 356         struct cumanascsi2_info *info;
 357         char *p = buffer;
 358         int pos;
 359
 360         if (inout == 1)
 361                 return cumanascsi_2_set_proc_info(host, buffer, length);
 362
 363         info = (struct cumanascsi2_info *)host->hostdata;
 364
 365         p += sprintf(p, "Cumana SCSI II driver v%s\n", VERSION);
 366         p += fas216_print_host(&info->info, p);
 367         p += sprintf(p, "Term    : o%s\n",
 368                         info->terms ? "n" : "ff");
 369
 370         p += fas216_print_stats(&info->info, p);
 371         p += fas216_print_devices(&info->info, p);
 372
 373         *start = buffer + offset;
 374         pos = p - buffer - offset;
 375         if (pos > length)
 376                 pos = length;
 377
 378         return pos;
 379 }
 380
 381 static struct scsi_host_template cumanascsi2_template = {
 382         .module                         = THIS_MODULE,
 383         .proc_info                      = cumanascsi_2_proc_info,
 384         .name                           = "Cumana SCSI II",
 385         .info                           = cumanascsi_2_info,
 386         .queuecommand                   = fas216_queue_command,
 387         .eh_host_reset_handler          = fas216_eh_host_reset,
 388         .eh_bus_reset_handler           = fas216_eh_bus_reset,
 389         .eh_device_reset_handler        = fas216_eh_device_reset,
 390         .eh_abort_handler               = fas216_eh_abort,
 391         .can_queue                      = 1,
 392         .this_id                        = 7,
 393         .sg_tablesize                   = SG_ALL,
 394         .cmd_per_lun                    = 1,
 395         .use_clustering                 = DISABLE_CLUSTERING,
 396         .proc_name                      = "cumanascsi2",
 397 };
 398
 399 static int __devinit
 400 cumanascsi2_probe(struct expansion_card *ec, const struct ecard_id *id)
 401 {
 402         struct Scsi_Host *host;
 403         struct cumanascsi2_info *info;
 404         unsigned long resbase, reslen;
 405         void __iomem *base;
 406         int ret;
 407
 408         ret = ecard_request_resources(ec);
 409         if (ret)
 410                 goto out;
 411
 412         resbase = ecard_resource_start(ec, ECARD_RES_MEMC);
 413         reslen = ecard_resource_len(ec, ECARD_RES_MEMC);
 414         base = ioremap(resbase, reslen);
 415         if (!base) {
 416                 ret = -ENOMEM;
 417                 goto out_region;
 418         }
 419
 420         host = scsi_host_alloc(&cumanascsi2_template,
 421                                sizeof(struct cumanascsi2_info));
 422         if (!host) {
 423                 ret = -ENOMEM;
 424                 goto out_unmap;
 425         }
 426
 427         ecard_set_drvdata(ec, host);
 428
 429         info = (struct cumanascsi2_info *)host->hostdata;
 430         info->ec        = ec;
 431         info->base      = base;
 432
 433         cumanascsi_2_terminator_ctl(host, term[ec->slot_no]);
 434
 435         info->info.scsi.io_base         = base + CUMANASCSI2_FAS216_OFFSET;
 436         info->info.scsi.io_shift        = CUMANASCSI2_FAS216_SHIFT;
 437         info->info.scsi.irq             = ec->irq;
 438         info->info.scsi.dma             = ec->dma;
 439         info->info.ifcfg.clockrate      = 40; /* MHz */
 440         info->info.ifcfg.select_timeout = 255;
 441         info->info.ifcfg.asyncperiod    = 200; /* ns */
 442         info->info.ifcfg.sync_max_depth = 7;
 443         info->info.ifcfg.cntl3          = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
 444         info->info.ifcfg.disconnect_ok  = 1;
 445         info->info.ifcfg.wide_max_size  = 0;
 446         info->info.ifcfg.capabilities   = FASCAP_PSEUDODMA;
 447         info->info.dma.setup            = cumanascsi_2_dma_setup;
 448         info->info.dma.pseudo           = cumanascsi_2_dma_pseudo;
 449         info->info.dma.stop             = cumanascsi_2_dma_stop;
 450
 451         ec->irqaddr     = info->base + CUMANASCSI2_STATUS;
 452         ec->irqmask     = STATUS_INT;
 453         ec->irq_data    = info;
 454         ec->ops         = &cumanascsi_2_ops;
 455
 456         ret = fas216_init(host);
 457         if (ret)
 458                 goto out_free;
 459
 460         ret = request_irq(ec->irq, cumanascsi_2_intr,
 461                           IRQF_DISABLED, "cumanascsi2", info);
 462         if (ret) {
 463                 printk("scsi%d: IRQ%d not free: %d\n",
 464                        host->host_no, ec->irq, ret);
 465                 goto out_release;
 466         }
 467
 468         if (info->info.scsi.dma != NO_DMA) {
 469                 if (request_dma(info->info.scsi.dma, "cumanascsi2")) {
 470                         printk("scsi%d: DMA%d not free, using PIO\n",
 471                                host->host_no, info->info.scsi.dma);
 472                         info->info.scsi.dma = NO_DMA;
 473                 } else {
 474                         set_dma_speed(info->info.scsi.dma, 180);
 475                         info->info.ifcfg.capabilities |= FASCAP_DMA;
 476                 }
 477         }
 478
 479         ret = fas216_add(host, &ec->dev);
 480         if (ret == 0)
 481                 goto out;
 482
 483         if (info->info.scsi.dma != NO_DMA)
 484                 free_dma(info->info.scsi.dma);
 485         free_irq(ec->irq, host);
 486
 487  out_release:
 488         fas216_release(host);
 489
 490  out_free:
 491         scsi_host_put(host);
 492
 493  out_unmap:
 494         iounmap(base);
 495
 496  out_region:
 497         ecard_release_resources(ec);
 498
 499  out:
 500         return ret;
 501 }
 502
 503 static void __devexit cumanascsi2_remove(struct expansion_card *ec)
 504 {
 505         struct Scsi_Host *host = ecard_get_drvdata(ec);
 506         struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
 507
 508         ecard_set_drvdata(ec, NULL);
 509         fas216_remove(host);
 510
 511         if (info->info.scsi.dma != NO_DMA)
 512                 free_dma(info->info.scsi.dma);
 513         free_irq(ec->irq, info);
 514
 515         iounmap(info->base);
 516
 517         fas216_release(host);
 518         scsi_host_put(host);
 519         ecard_release_resources(ec);
 520 }
 521
 522 static const struct ecard_id cumanascsi2_cids[] = {
 523         { MANU_CUMANA, PROD_CUMANA_SCSI_2 },
 524         { 0xffff, 0xffff },
 525 };
 526
 527 static struct ecard_driver cumanascsi2_driver = {
 528         .probe          = cumanascsi2_probe,
 529         .remove         = __devexit_p(cumanascsi2_remove),
 530         .id_table       = cumanascsi2_cids,
 531         .drv = {
 532                 .name           = "cumanascsi2",
 533         },
 534 };
 535
 536 static int __init cumanascsi2_init(void)
 537 {
 538         return ecard_register_driver(&cumanascsi2_driver);
 539 }
 540
 541 static void __exit cumanascsi2_exit(void)
 542 {
 543         ecard_remove_driver(&cumanascsi2_driver);
 544 }
 545
 546 module_init(cumanascsi2_init);
 547 module_exit(cumanascsi2_exit);
 548
 549 MODULE_AUTHOR("Russell King");
 550 MODULE_DESCRIPTION("Cumana SCSI-2 driver for Acorn machines");
 551 module_param_array(term, int, NULL, 0);
 552 MODULE_PARM_DESC(term, "SCSI bus termination");
 553 MODULE_LICENSE("GPL");