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