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