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