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