git.oblomov.eu Git - linux-2.6/blob - drivers/ide/ide-floppy.c

   1 /*
   2  * IDE ATAPI floppy driver.
   3  *
   4  * Copyright (C) 1996-1999  Gadi Oxman <gadio@netvision.net.il>
   5  * Copyright (C) 2000-2002  Paul Bristow <paul@paulbristow.net>
   6  * Copyright (C) 2005       Bartlomiej Zolnierkiewicz
   7  *
   8  * This driver supports the following IDE floppy drives:
   9  *
  10  * LS-120/240 SuperDisk
  11  * Iomega Zip 100/250
  12  * Iomega PC Card Clik!/PocketZip
  13  *
  14  * For a historical changelog see
  15  * Documentation/ide/ChangeLog.ide-floppy.1996-2002
  16  */
  17
  18 #include <linux/types.h>
  19 #include <linux/string.h>
  20 #include <linux/kernel.h>
  21 #include <linux/delay.h>
  22 #include <linux/timer.h>
  23 #include <linux/mm.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/major.h>
  26 #include <linux/errno.h>
  27 #include <linux/genhd.h>
  28 #include <linux/slab.h>
  29 #include <linux/cdrom.h>
  30 #include <linux/ide.h>
  31 #include <linux/hdreg.h>
  32 #include <linux/bitops.h>
  33 #include <linux/mutex.h>
  34 #include <linux/scatterlist.h>
  35
  36 #include <scsi/scsi_ioctl.h>
  37
  38 #include <asm/byteorder.h>
  39 #include <linux/irq.h>
  40 #include <linux/uaccess.h>
  41 #include <linux/io.h>
  42 #include <asm/unaligned.h>
  43
  44 #include "ide-floppy.h"
  45
  46 /*
  47  * After each failed packet command we issue a request sense command and retry
  48  * the packet command IDEFLOPPY_MAX_PC_RETRIES times.
  49  */
  50 #define IDEFLOPPY_MAX_PC_RETRIES        3
  51
  52 /* format capacities descriptor codes */
  53 #define CAPACITY_INVALID        0x00
  54 #define CAPACITY_UNFORMATTED    0x01
  55 #define CAPACITY_CURRENT        0x02
  56 #define CAPACITY_NO_CARTRIDGE   0x03
  57
  58 /*
  59  * The following delay solves a problem with ATAPI Zip 100 drive where BSY bit
  60  * was apparently being deasserted before the unit was ready to receive data.
  61  */
  62 #define IDEFLOPPY_PC_DELAY      (HZ/20) /* default delay for ZIP 100 (50ms) */
  63
  64 /* Error code returned in rq->errors to the higher part of the driver. */
  65 #define IDEFLOPPY_ERROR_GENERAL         101
  66
  67 /*
  68  * Used to finish servicing a request. For read/write requests, we will call
  69  * ide_end_request to pass to the next buffer.
  70  */
  71 static int ide_floppy_end_request(ide_drive_t *drive, int uptodate, int nsecs)
  72 {
  73         struct ide_disk_obj *floppy = drive->driver_data;
  74         struct request *rq = HWGROUP(drive)->rq;
  75         int error;
  76
  77         ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
  78
  79         switch (uptodate) {
  80         case 0:
  81                 error = IDEFLOPPY_ERROR_GENERAL;
  82                 break;
  83
  84         case 1:
  85                 error = 0;
  86                 break;
  87
  88         default:
  89                 error = uptodate;
  90         }
  91
  92         if (error)
  93                 floppy->failed_pc = NULL;
  94         /* Why does this happen? */
  95         if (!rq)
  96                 return 0;
  97         if (!blk_special_request(rq)) {
  98                 /* our real local end request function */
  99                 ide_end_request(drive, uptodate, nsecs);
 100                 return 0;
 101         }
 102         rq->errors = error;
 103         /* fixme: need to move this local also */
 104         ide_end_drive_cmd(drive, 0, 0);
 105         return 0;
 106 }
 107
 108 static void idefloppy_update_buffers(ide_drive_t *drive,
 109                                 struct ide_atapi_pc *pc)
 110 {
 111         struct request *rq = pc->rq;
 112         struct bio *bio = rq->bio;
 113
 114         while ((bio = rq->bio) != NULL)
 115                 ide_floppy_end_request(drive, 1, 0);
 116 }
 117
 118 static void ide_floppy_callback(ide_drive_t *drive, int dsc)
 119 {
 120         struct ide_disk_obj *floppy = drive->driver_data;
 121         struct ide_atapi_pc *pc = drive->pc;
 122         int uptodate = pc->error ? 0 : 1;
 123
 124         ide_debug_log(IDE_DBG_FUNC, "Call %s\n", __func__);
 125
 126         if (floppy->failed_pc == pc)
 127                 floppy->failed_pc = NULL;
 128
 129         if (pc->c[0] == GPCMD_READ_10 || pc->c[0] == GPCMD_WRITE_10 ||
 130             (pc->rq && blk_pc_request(pc->rq)))
 131                 uptodate = 1; /* FIXME */
 132         else if (pc->c[0] == GPCMD_REQUEST_SENSE) {
 133                 u8 *buf = pc->buf;
 134
 135                 if (!pc->error) {
 136                         floppy->sense_key = buf[2] & 0x0F;
 137                         floppy->asc = buf[12];
 138                         floppy->ascq = buf[13];
 139                         floppy->progress_indication = buf[15] & 0x80 ?
 140                                 (u16)get_unaligned((u16 *)&buf[16]) : 0x10000;
 141
 142                         if (floppy->failed_pc)
 143                                 ide_debug_log(IDE_DBG_PC, "pc = %x, ",
 144                                               floppy->failed_pc->c[0]);
 145
 146                         ide_debug_log(IDE_DBG_SENSE, "sense key = %x, asc = %x,"
 147                                       "ascq = %x\n", floppy->sense_key,
 148                                       floppy->asc, floppy->ascq);
 149                 } else
 150                         printk(KERN_ERR PFX "Error in REQUEST SENSE itself - "
 151                                "Aborting request!\n");
 152         }
 153
 154         ide_floppy_end_request(drive, uptodate, 0);
 155 }
 156
 157 static void ide_floppy_report_error(struct ide_disk_obj *floppy,
 158                                     struct ide_atapi_pc *pc)
 159 {
 160         /* supress error messages resulting from Medium not present */
 161         if (floppy->sense_key == 0x02 &&
 162             floppy->asc       == 0x3a &&
 163             floppy->ascq      == 0x00)
 164                 return;
 165
 166         printk(KERN_ERR PFX "%s: I/O error, pc = %2x, key = %2x, "
 167                         "asc = %2x, ascq = %2x\n",
 168                         floppy->drive->name, pc->c[0], floppy->sense_key,
 169                         floppy->asc, floppy->ascq);
 170
 171 }
 172
 173 static ide_startstop_t idefloppy_issue_pc(ide_drive_t *drive,
 174                 struct ide_atapi_pc *pc)
 175 {
 176         struct ide_disk_obj *floppy = drive->driver_data;
 177
 178         if (floppy->failed_pc == NULL &&
 179             pc->c[0] != GPCMD_REQUEST_SENSE)
 180                 floppy->failed_pc = pc;
 181
 182         /* Set the current packet command */
 183         drive->pc = pc;
 184
 185         if (pc->retries > IDEFLOPPY_MAX_PC_RETRIES) {
 186                 if (!(pc->flags & PC_FLAG_SUPPRESS_ERROR))
 187                         ide_floppy_report_error(floppy, pc);
 188                 /* Giving up */
 189                 pc->error = IDEFLOPPY_ERROR_GENERAL;
 190
 191                 floppy->failed_pc = NULL;
 192                 drive->pc_callback(drive, 0);
 193                 return ide_stopped;
 194         }
 195
 196         ide_debug_log(IDE_DBG_FUNC, "%s: Retry #%d\n", __func__, pc->retries);
 197
 198         pc->retries++;
 199
 200         return ide_issue_pc(drive, WAIT_FLOPPY_CMD, NULL);
 201 }
 202
 203 void ide_floppy_create_read_capacity_cmd(struct ide_atapi_pc *pc)
 204 {
 205         ide_init_pc(pc);
 206         pc->c[0] = GPCMD_READ_FORMAT_CAPACITIES;
 207         pc->c[7] = 255;
 208         pc->c[8] = 255;
 209         pc->req_xfer = 255;
 210 }
 211
 212 /* A mode sense command is used to "sense" floppy parameters. */
 213 void ide_floppy_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
 214 {
 215         u16 length = 8; /* sizeof(Mode Parameter Header) = 8 Bytes */
 216
 217         ide_init_pc(pc);
 218         pc->c[0] = GPCMD_MODE_SENSE_10;
 219         pc->c[1] = 0;
 220         pc->c[2] = page_code;
 221
 222         switch (page_code) {
 223         case IDEFLOPPY_CAPABILITIES_PAGE:
 224                 length += 12;
 225                 break;
 226         case IDEFLOPPY_FLEXIBLE_DISK_PAGE:
 227                 length += 32;
 228                 break;
 229         default:
 230                 printk(KERN_ERR PFX "unsupported page code in %s\n", __func__);
 231         }
 232         put_unaligned(cpu_to_be16(length), (u16 *) &pc->c[7]);
 233         pc->req_xfer = length;
 234 }
 235
 236 static void idefloppy_create_rw_cmd(ide_drive_t *drive,
 237                                     struct ide_atapi_pc *pc, struct request *rq,
 238                                     unsigned long sector)
 239 {
 240         struct ide_disk_obj *floppy = drive->driver_data;
 241         int block = sector / floppy->bs_factor;
 242         int blocks = rq->nr_sectors / floppy->bs_factor;
 243         int cmd = rq_data_dir(rq);
 244
 245         ide_debug_log(IDE_DBG_FUNC, "%s: block: %d, blocks: %d\n", __func__,
 246                       block, blocks);
 247
 248         ide_init_pc(pc);
 249         pc->c[0] = cmd == READ ? GPCMD_READ_10 : GPCMD_WRITE_10;
 250         put_unaligned(cpu_to_be16(blocks), (unsigned short *)&pc->c[7]);
 251         put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[2]);
 252
 253         memcpy(rq->cmd, pc->c, 12);
 254
 255         pc->rq = rq;
 256         pc->b_count = 0;
 257         if (rq->cmd_flags & REQ_RW)
 258                 pc->flags |= PC_FLAG_WRITING;
 259         pc->buf = NULL;
 260         pc->req_xfer = pc->buf_size = blocks * floppy->block_size;
 261         pc->flags |= PC_FLAG_DMA_OK;
 262 }
 263
 264 static void idefloppy_blockpc_cmd(struct ide_disk_obj *floppy,
 265                 struct ide_atapi_pc *pc, struct request *rq)
 266 {
 267         ide_init_pc(pc);
 268         memcpy(pc->c, rq->cmd, sizeof(pc->c));
 269         pc->rq = rq;
 270         pc->b_count = 0;
 271         if (rq->data_len && rq_data_dir(rq) == WRITE)
 272                 pc->flags |= PC_FLAG_WRITING;
 273         pc->buf = rq->data;
 274         if (rq->bio)
 275                 pc->flags |= PC_FLAG_DMA_OK;
 276         /*
 277          * possibly problematic, doesn't look like ide-floppy correctly
 278          * handled scattered requests if dma fails...
 279          */
 280         pc->req_xfer = pc->buf_size = rq->data_len;
 281 }
 282
 283 static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
 284                                              struct request *rq, sector_t block)
 285 {
 286         struct ide_disk_obj *floppy = drive->driver_data;
 287         ide_hwif_t *hwif = drive->hwif;
 288         struct ide_atapi_pc *pc;
 289
 290         ide_debug_log(IDE_DBG_FUNC, "%s: dev: %s, cmd: 0x%x, cmd_type: %x, "
 291                       "errors: %d\n",
 292                       __func__, rq->rq_disk ? rq->rq_disk->disk_name : "?",
 293                       rq->cmd[0], rq->cmd_type, rq->errors);
 294
 295         ide_debug_log(IDE_DBG_FUNC, "%s: sector: %ld, nr_sectors: %ld, "
 296                       "current_nr_sectors: %d\n",
 297                       __func__, (long)rq->sector, rq->nr_sectors,
 298                       rq->current_nr_sectors);
 299
 300         if (rq->errors >= ERROR_MAX) {
 301                 if (floppy->failed_pc)
 302                         ide_floppy_report_error(floppy, floppy->failed_pc);
 303                 else
 304                         printk(KERN_ERR PFX "%s: I/O error\n", drive->name);
 305
 306                 ide_floppy_end_request(drive, 0, 0);
 307                 return ide_stopped;
 308         }
 309         if (blk_fs_request(rq)) {
 310                 if (((long)rq->sector % floppy->bs_factor) ||
 311                     (rq->nr_sectors % floppy->bs_factor)) {
 312                         printk(KERN_ERR PFX "%s: unsupported r/w rq size\n",
 313                                 drive->name);
 314                         ide_floppy_end_request(drive, 0, 0);
 315                         return ide_stopped;
 316                 }
 317                 pc = &floppy->queued_pc;
 318                 idefloppy_create_rw_cmd(drive, pc, rq, (unsigned long)block);
 319         } else if (blk_special_request(rq)) {
 320                 pc = (struct ide_atapi_pc *) rq->buffer;
 321         } else if (blk_pc_request(rq)) {
 322                 pc = &floppy->queued_pc;
 323                 idefloppy_blockpc_cmd(floppy, pc, rq);
 324         } else {
 325                 blk_dump_rq_flags(rq, PFX "unsupported command in queue");
 326                 ide_floppy_end_request(drive, 0, 0);
 327                 return ide_stopped;
 328         }
 329
 330         ide_init_sg_cmd(drive, rq);
 331         ide_map_sg(drive, rq);
 332
 333         pc->sg = hwif->sg_table;
 334         pc->sg_cnt = hwif->sg_nents;
 335
 336         pc->rq = rq;
 337
 338         return idefloppy_issue_pc(drive, pc);
 339 }
 340
 341 /*
 342  * Look at the flexible disk page parameters. We ignore the CHS capacity
 343  * parameters and use the LBA parameters instead.
 344  */
 345 static int ide_floppy_get_flexible_disk_page(ide_drive_t *drive)
 346 {
 347         struct ide_disk_obj *floppy = drive->driver_data;
 348         struct gendisk *disk = floppy->disk;
 349         struct ide_atapi_pc pc;
 350         u8 *page;
 351         int capacity, lba_capacity;
 352         u16 transfer_rate, sector_size, cyls, rpm;
 353         u8 heads, sectors;
 354
 355         ide_floppy_create_mode_sense_cmd(&pc, IDEFLOPPY_FLEXIBLE_DISK_PAGE);
 356
 357         if (ide_queue_pc_tail(drive, disk, &pc)) {
 358                 printk(KERN_ERR PFX "Can't get flexible disk page params\n");
 359                 return 1;
 360         }
 361
 362         if (pc.buf[3] & 0x80)
 363                 drive->dev_flags |= IDE_DFLAG_WP;
 364         else
 365                 drive->dev_flags &= ~IDE_DFLAG_WP;
 366
 367         set_disk_ro(disk, !!(drive->dev_flags & IDE_DFLAG_WP));
 368
 369         page = &pc.buf[8];
 370
 371         transfer_rate = be16_to_cpup((__be16 *)&pc.buf[8 + 2]);
 372         sector_size   = be16_to_cpup((__be16 *)&pc.buf[8 + 6]);
 373         cyls          = be16_to_cpup((__be16 *)&pc.buf[8 + 8]);
 374         rpm           = be16_to_cpup((__be16 *)&pc.buf[8 + 28]);
 375         heads         = pc.buf[8 + 4];
 376         sectors       = pc.buf[8 + 5];
 377
 378         capacity = cyls * heads * sectors * sector_size;
 379
 380         if (memcmp(page, &floppy->flexible_disk_page, 32))
 381                 printk(KERN_INFO PFX "%s: %dkB, %d/%d/%d CHS, %d kBps, "
 382                                 "%d sector size, %d rpm\n",
 383                                 drive->name, capacity / 1024, cyls, heads,
 384                                 sectors, transfer_rate / 8, sector_size, rpm);
 385
 386         memcpy(&floppy->flexible_disk_page, page, 32);
 387         drive->bios_cyl = cyls;
 388         drive->bios_head = heads;
 389         drive->bios_sect = sectors;
 390         lba_capacity = floppy->blocks * floppy->block_size;
 391
 392         if (capacity < lba_capacity) {
 393                 printk(KERN_NOTICE PFX "%s: The disk reports a capacity of %d "
 394                         "bytes, but the drive only handles %d\n",
 395                         drive->name, lba_capacity, capacity);
 396                 floppy->blocks = floppy->block_size ?
 397                         capacity / floppy->block_size : 0;
 398                 drive->capacity64 = floppy->blocks * floppy->bs_factor;
 399         }
 400
 401         return 0;
 402 }
 403
 404 /*
 405  * Determine if a media is present in the floppy drive, and if so, its LBA
 406  * capacity.
 407  */
 408 static int ide_floppy_get_capacity(ide_drive_t *drive)
 409 {
 410         struct ide_disk_obj *floppy = drive->driver_data;
 411         struct gendisk *disk = floppy->disk;
 412         struct ide_atapi_pc pc;
 413         u8 *cap_desc;
 414         u8 header_len, desc_cnt;
 415         int i, rc = 1, blocks, length;
 416
 417         drive->bios_cyl = 0;
 418         drive->bios_head = drive->bios_sect = 0;
 419         floppy->blocks = 0;
 420         floppy->bs_factor = 1;
 421         drive->capacity64 = 0;
 422
 423         ide_floppy_create_read_capacity_cmd(&pc);
 424         if (ide_queue_pc_tail(drive, disk, &pc)) {
 425                 printk(KERN_ERR PFX "Can't get floppy parameters\n");
 426                 return 1;
 427         }
 428         header_len = pc.buf[3];
 429         cap_desc = &pc.buf[4];
 430         desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */
 431
 432         for (i = 0; i < desc_cnt; i++) {
 433                 unsigned int desc_start = 4 + i*8;
 434
 435                 blocks = be32_to_cpup((__be32 *)&pc.buf[desc_start]);
 436                 length = be16_to_cpup((__be16 *)&pc.buf[desc_start + 6]);
 437
 438                 ide_debug_log(IDE_DBG_PROBE, "Descriptor %d: %dkB, %d blocks, "
 439                               "%d sector size\n",
 440                               i, blocks * length / 1024, blocks, length);
 441
 442                 if (i)
 443                         continue;
 444                 /*
 445                  * the code below is valid only for the 1st descriptor, ie i=0
 446                  */
 447
 448                 switch (pc.buf[desc_start + 4] & 0x03) {
 449                 /* Clik! drive returns this instead of CAPACITY_CURRENT */
 450                 case CAPACITY_UNFORMATTED:
 451                         if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
 452                                 /*
 453                                  * If it is not a clik drive, break out
 454                                  * (maintains previous driver behaviour)
 455                                  */
 456                                 break;
 457                 case CAPACITY_CURRENT:
 458                         /* Normal Zip/LS-120 disks */
 459                         if (memcmp(cap_desc, &floppy->cap_desc, 8))
 460                                 printk(KERN_INFO PFX "%s: %dkB, %d blocks, %d "
 461                                        "sector size\n",
 462                                        drive->name, blocks * length / 1024,
 463                                        blocks, length);
 464                         memcpy(&floppy->cap_desc, cap_desc, 8);
 465
 466                         if (!length || length % 512) {
 467                                 printk(KERN_NOTICE PFX "%s: %d bytes block size"
 468                                        " not supported\n", drive->name, length);
 469                         } else {
 470                                 floppy->blocks = blocks;
 471                                 floppy->block_size = length;
 472                                 floppy->bs_factor = length / 512;
 473                                 if (floppy->bs_factor != 1)
 474                                         printk(KERN_NOTICE PFX "%s: Warning: "
 475                                                "non 512 bytes block size not "
 476                                                "fully supported\n",
 477                                                drive->name);
 478                                 drive->capacity64 =
 479                                         floppy->blocks * floppy->bs_factor;
 480                                 rc = 0;
 481                         }
 482                         break;
 483                 case CAPACITY_NO_CARTRIDGE:
 484                         /*
 485                          * This is a KERN_ERR so it appears on screen
 486                          * for the user to see
 487                          */
 488                         printk(KERN_ERR PFX "%s: No disk in drive\n",
 489                                drive->name);
 490                         break;
 491                 case CAPACITY_INVALID:
 492                         printk(KERN_ERR PFX "%s: Invalid capacity for disk "
 493                                 "in drive\n", drive->name);
 494                         break;
 495                 }
 496                 ide_debug_log(IDE_DBG_PROBE, "Descriptor 0 Code: %d\n",
 497                               pc.buf[desc_start + 4] & 0x03);
 498         }
 499
 500         /* Clik! disk does not support get_flexible_disk_page */
 501         if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
 502                 (void) ide_floppy_get_flexible_disk_page(drive);
 503
 504         return rc;
 505 }
 506
 507 static void ide_floppy_setup(ide_drive_t *drive)
 508 {
 509         struct ide_disk_obj *floppy = drive->driver_data;
 510         u16 *id = drive->id;
 511
 512         drive->pc_callback       = ide_floppy_callback;
 513         drive->pc_update_buffers = idefloppy_update_buffers;
 514         drive->pc_io_buffers     = ide_io_buffers;
 515
 516         /*
 517          * We used to check revisions here. At this point however I'm giving up.
 518          * Just assume they are all broken, its easier.
 519          *
 520          * The actual reason for the workarounds was likely a driver bug after
 521          * all rather than a firmware bug, and the workaround below used to hide
 522          * it. It should be fixed as of version 1.9, but to be on the safe side
 523          * we'll leave the limitation below for the 2.2.x tree.
 524          */
 525         if (!strncmp((char *)&id[ATA_ID_PROD], "IOMEGA ZIP 100 ATAPI", 20)) {
 526                 drive->atapi_flags |= IDE_AFLAG_ZIP_DRIVE;
 527                 /* This value will be visible in the /proc/ide/hdx/settings */
 528                 drive->pc_delay = IDEFLOPPY_PC_DELAY;
 529                 blk_queue_max_sectors(drive->queue, 64);
 530         }
 531
 532         /*
 533          * Guess what? The IOMEGA Clik! drive also needs the above fix. It makes
 534          * nasty clicking noises without it, so please don't remove this.
 535          */
 536         if (strncmp((char *)&id[ATA_ID_PROD], "IOMEGA Clik!", 11) == 0) {
 537                 blk_queue_max_sectors(drive->queue, 64);
 538                 drive->atapi_flags |= IDE_AFLAG_CLIK_DRIVE;
 539                 /* IOMEGA Clik! drives do not support lock/unlock commands */
 540                 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
 541         }
 542
 543         (void) ide_floppy_get_capacity(drive);
 544
 545         ide_proc_register_driver(drive, floppy->driver);
 546
 547         drive->dev_flags |= IDE_DFLAG_ATTACH;
 548 }
 549
 550 static void ide_floppy_flush(ide_drive_t *drive)
 551 {
 552 }
 553
 554 static int ide_floppy_init_media(ide_drive_t *drive, struct gendisk *disk)
 555 {
 556         int ret = 0;
 557
 558         if (ide_do_test_unit_ready(drive, disk))
 559                 ide_do_start_stop(drive, disk, 1);
 560
 561         ret = ide_floppy_get_capacity(drive);
 562
 563         set_capacity(disk, ide_gd_capacity(drive));
 564
 565         return ret;
 566 }
 567
 568 const struct ide_disk_ops ide_atapi_disk_ops = {
 569         .check          = ide_check_atapi_device,
 570         .get_capacity   = ide_floppy_get_capacity,
 571         .setup          = ide_floppy_setup,
 572         .flush          = ide_floppy_flush,
 573         .init_media     = ide_floppy_init_media,
 574         .set_doorlock   = ide_set_media_lock,
 575         .do_request     = ide_floppy_do_request,
 576         .end_request    = ide_floppy_end_request,
 577         .ioctl          = ide_floppy_ioctl,
 578 };