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