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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/sched.h>
  25 #include <linux/proc_fs.h>
  26 #include <linux/delay.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/init.h>
  29 #include <linux/dma-mapping.h>
  30
  31 #include <asm/dma.h>
  32 #include <asm/ecard.h>
  33 #include <asm/io.h>
  34 #include <asm/pgtable.h>
  35
  36 #include "../scsi.h"
  37 #include <scsi/scsi_host.h>
  38 #include "fas216.h"
  39 #include "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        2
  64
  65 /*
  66  * Version
  67  */
  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/off
  72  */
  73 static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
  74
  75 #define NR_SG   256
  76
  77 struct 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 card
  90  * Params   : ec    - expansion card structure
  91  *          : irqnr - interrupt number
  92  */
  93 static void
  94 cumanascsi_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 card
 102  * Params   : ec    - expansion card structure
 103  *          : irqnr - interrupt number
 104  */
 105 static void
 106 cumanascsi_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
 112 static 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 off
 119  * Params   : host   - card to turn on/off
 120  *          : on_off - !0 to turn on, 0 to turn off
 121  */
 122 static void
 123 cumanascsi_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 card
 138  * Params   : irq    - interrupt number
 139  *            dev_id - user-defined (Scsi_Host structure)
 140  *            regs   - processor registers at interrupt
 141  */
 142 static irqreturn_t
 143 cumanascsi_2_intr(int irq, void *dev_id, struct pt_regs *regs)
 144 {
 145         struct cumanascsi2_info *info = dev_id;
 146
 147         return fas216_intr(&info->info);
 148 }
 149
 150 /* Prototype: fasdmatype_t cumanascsi_2_dma_setup(host, SCpnt, direction, min_type)
 151  * Purpose  : initialises DMA/PIO
 152  * Params   : host      - host
 153  *            SCpnt     - command
 154  *            direction - DMA on to/off of card
 155  *            min_type  - minimum DMA support that we must have for this transfer
 156  * Returns  : type of transfer to be performed
 157  */
 158 static fasdmatype_t
 159 cumanascsi_2_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
 160                        fasdmadir_t direction, fasdmatype_t min_type)
 161 {
 162         struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
 163         struct device *dev = scsi_get_device(host);
 164         int dmach = info->info.scsi.dma;
 165
 166         writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH);
 167
 168         if (dmach != NO_DMA &&
 169             (min_type == fasdma_real_all || SCp->this_residual >= 512)) {
 170                 int bufs, map_dir, dma_dir, alatch_dir;
 171
 172                 bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
 173
 174                 if (direction == DMA_OUT)
 175                         map_dir = DMA_TO_DEVICE,
 176                         dma_dir = DMA_MODE_WRITE,
 177                         alatch_dir = ALATCH_DMA_OUT;
 178                 else
 179                         map_dir = DMA_FROM_DEVICE,
 180                         dma_dir = DMA_MODE_READ,
 181                         alatch_dir = ALATCH_DMA_IN;
 182
 183                 dma_map_sg(dev, info->sg, bufs + 1, map_dir);
 184
 185                 disable_dma(dmach);
 186                 set_dma_sg(dmach, info->sg, bufs + 1);
 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 DMA
 198          */
 199         return fasdma_pio;
 200 }
 201
 202 /*
 203  * Prototype: void cumanascsi_2_dma_pseudo(host, SCpnt, direction, transfer)
 204  * Purpose  : handles pseudo DMA
 205  * Params   : host      - host
 206  *            SCpnt     - command
 207  *            direction - DMA on to/off of card
 208  *            transfer  - minimum number of bytes we expect to transfer
 209  */
 210 static void
 211 cumanascsi_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 0
 223                 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 #else
 239                 printk ("PSEUDO_OUT???\n");
 240 #endif
 241         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/PIO
 281  * Params   : host  - host
 282  *            SCpnt - command
 283  */
 284 static void
 285 cumanascsi_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  */
 299 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 function
 313  * Params   : host   - host to setup
 314  *          : buffer - buffer containing string describing operation
 315  *          : length - length of string
 316  * Returns  : -EINVAL, or 0
 317  */
 318 static int
 319 cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
 320 {
 321         int ret = length;
 322
 323         if (length >= 11 && strcmp(buffer, "CUMANASCSI2") == 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                         else
 333                                 ret = -EINVAL;
 334                 } else
 335                         ret = -EINVAL;
 336         } else
 337                 ret = -EINVAL;
 338
 339         return ret;
 340 }
 341
 342 /* Prototype: int cumanascsi_2_proc_info(char *buffer, char **start, off_t offset,
 343  *                                       int length, int host_no, int inout)
 344  * Purpose  : Return information about the driver to a user process accessing
 345  *            the /proc filesystem.
 346  * Params   : buffer - a buffer to write information to
 347  *            start  - a pointer into this buffer set by this routine to the start
 348  *                     of the required information.
 349  *            offset - offset into information that we have read upto.
 350  *            length - length of buffer
 351  *            host_no - host number to return information for
 352  *            inout  - 0 for reading, 1 for writing.
 353  * Returns  : length of data written to buffer.
 354  */
 355 int cumanascsi_2_proc_info (struct Scsi_Host *host, char *buffer, char **start, off_t offset,
 356                             int length, int inout)
 357 {
 358         struct cumanascsi2_info *info;
 359         char *p = buffer;
 360         int pos;
 361
 362         if (inout == 1)
 363                 return cumanascsi_2_set_proc_info(host, buffer, length);
 364
 365         info = (struct cumanascsi2_info *)host->hostdata;
 366
 367         p += sprintf(p, "Cumana SCSI II driver v%s\n", VERSION);
 368         p += fas216_print_host(&info->info, p);
 369         p += sprintf(p, "Term    : o%s\n",
 370                         info->terms ? "n" : "ff");
 371
 372         p += fas216_print_stats(&info->info, p);
 373         p += fas216_print_devices(&info->info, p);
 374
 375         *start = buffer + offset;
 376         pos = p - buffer - offset;
 377         if (pos > length)
 378                 pos = length;
 379
 380         return pos;
 381 }
 382
 383 static struct scsi_host_template cumanascsi2_template = {
 384         .module                         = THIS_MODULE,
 385         .proc_info                      = cumanascsi_2_proc_info,
 386         .name                           = "Cumana SCSI II",
 387         .info                           = cumanascsi_2_info,
 388         .queuecommand                   = fas216_queue_command,
 389         .eh_host_reset_handler          = fas216_eh_host_reset,
 390         .eh_bus_reset_handler           = fas216_eh_bus_reset,
 391         .eh_device_reset_handler        = fas216_eh_device_reset,
 392         .eh_abort_handler               = fas216_eh_abort,
 393         .can_queue                      = 1,
 394         .this_id                        = 7,
 395         .sg_tablesize                   = SG_ALL,
 396         .cmd_per_lun                    = 1,
 397         .use_clustering                 = DISABLE_CLUSTERING,
 398         .proc_name                      = "cumanascsi2",
 399 };
 400
 401 static int __devinit
 402 cumanascsi2_probe(struct expansion_card *ec, const struct ecard_id *id)
 403 {
 404         struct Scsi_Host *host;
 405         struct cumanascsi2_info *info;
 406         unsigned long resbase, reslen;
 407         void __iomem *base;
 408         int ret;
 409
 410         ret = ecard_request_resources(ec);
 411         if (ret)
 412                 goto out;
 413
 414         resbase = ecard_resource_start(ec, ECARD_RES_MEMC);
 415         reslen = ecard_resource_len(ec, ECARD_RES_MEMC);
 416         base = ioremap(resbase, reslen);
 417         if (!base) {
 418                 ret = -ENOMEM;
 419                 goto out_region;
 420         }
 421
 422         host = scsi_host_alloc(&cumanascsi2_template,
 423                                sizeof(struct cumanascsi2_info));
 424         if (!host) {
 425                 ret = -ENOMEM;
 426                 goto out_unmap;
 427         }
 428
 429         ecard_set_drvdata(ec, host);
 430
 431         info = (struct cumanascsi2_info *)host->hostdata;
 432         info->ec        = ec;
 433         info->base      = base;
 434
 435         cumanascsi_2_terminator_ctl(host, term[ec->slot_no]);
 436
 437         info->info.scsi.io_base         = base + CUMANASCSI2_FAS216_OFFSET;
 438         info->info.scsi.io_shift        = CUMANASCSI2_FAS216_SHIFT;
 439         info->info.scsi.irq             = ec->irq;
 440         info->info.scsi.dma             = ec->dma;
 441         info->info.ifcfg.clockrate      = 40; /* MHz */
 442         info->info.ifcfg.select_timeout = 255;
 443         info->info.ifcfg.asyncperiod    = 200; /* ns */
 444         info->info.ifcfg.sync_max_depth = 7;
 445         info->info.ifcfg.cntl3          = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
 446         info->info.ifcfg.disconnect_ok  = 1;
 447         info->info.ifcfg.wide_max_size  = 0;
 448         info->info.ifcfg.capabilities   = FASCAP_PSEUDODMA;
 449         info->info.dma.setup            = cumanascsi_2_dma_setup;
 450         info->info.dma.pseudo           = cumanascsi_2_dma_pseudo;
 451         info->info.dma.stop             = cumanascsi_2_dma_stop;
 452
 453         ec->irqaddr     = info->base + CUMANASCSI2_STATUS;
 454         ec->irqmask     = STATUS_INT;
 455         ec->irq_data    = info;
 456         ec->ops         = &cumanascsi_2_ops;
 457
 458         ret = fas216_init(host);
 459         if (ret)
 460                 goto out_free;
 461
 462         ret = request_irq(ec->irq, cumanascsi_2_intr,
 463                           IRQF_DISABLED, "cumanascsi2", info);
 464         if (ret) {
 465                 printk("scsi%d: IRQ%d not free: %d\n",
 466                        host->host_no, ec->irq, ret);
 467                 goto out_release;
 468         }
 469
 470         if (info->info.scsi.dma != NO_DMA) {
 471                 if (request_dma(info->info.scsi.dma, "cumanascsi2")) {
 472                         printk("scsi%d: DMA%d not free, using PIO\n",
 473                                host->host_no, info->info.scsi.dma);
 474                         info->info.scsi.dma = NO_DMA;
 475                 } else {
 476                         set_dma_speed(info->info.scsi.dma, 180);
 477                         info->info.ifcfg.capabilities |= FASCAP_DMA;
 478                 }
 479         }
 480
 481         ret = fas216_add(host, &ec->dev);
 482         if (ret == 0)
 483                 goto out;
 484
 485         if (info->info.scsi.dma != NO_DMA)
 486                 free_dma(info->info.scsi.dma);
 487         free_irq(ec->irq, host);
 488
 489  out_release:
 490         fas216_release(host);
 491
 492  out_free:
 493         scsi_host_put(host);
 494
 495  out_unmap:
 496         iounmap(base);
 497
 498  out_region:
 499         ecard_release_resources(ec);
 500
 501  out:
 502         return ret;
 503 }
 504
 505 static void __devexit cumanascsi2_remove(struct expansion_card *ec)
 506 {
 507         struct Scsi_Host *host = ecard_get_drvdata(ec);
 508         struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
 509
 510         ecard_set_drvdata(ec, NULL);
 511         fas216_remove(host);
 512
 513         if (info->info.scsi.dma != NO_DMA)
 514                 free_dma(info->info.scsi.dma);
 515         free_irq(ec->irq, info);
 516
 517         iounmap(info->base);
 518
 519         fas216_release(host);
 520         scsi_host_put(host);
 521         ecard_release_resources(ec);
 522 }
 523
 524 static const struct ecard_id cumanascsi2_cids[] = {
 525         { MANU_CUMANA, PROD_CUMANA_SCSI_2 },
 526         { 0xffff, 0xffff },
 527 };
 528
 529 static struct ecard_driver cumanascsi2_driver = {
 530         .probe          = cumanascsi2_probe,
 531         .remove         = __devexit_p(cumanascsi2_remove),
 532         .id_table       = cumanascsi2_cids,
 533         .drv = {
 534                 .name           = "cumanascsi2",
 535         },
 536 };
 537
 538 static int __init cumanascsi2_init(void)
 539 {
 540         return ecard_register_driver(&cumanascsi2_driver);
 541 }
 542
 543 static void __exit cumanascsi2_exit(void)
 544 {
 545         ecard_remove_driver(&cumanascsi2_driver);
 546 }
 547
 548 module_init(cumanascsi2_init);
 549 module_exit(cumanascsi2_exit);
 550
 551 MODULE_AUTHOR("Russell King");
 552 MODULE_DESCRIPTION("Cumana SCSI-2 driver for Acorn machines");
 553 module_param_array(term, int, NULL, 0);
 554 MODULE_PARM_DESC(term, "SCSI bus termination");
 555 MODULE_LICENSE("GPL");