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 #define DRV_NAME "ide-floppy"
  19
  20 #define IDEFLOPPY_VERSION "1.00"
  21
  22 #include <linux/module.h>
  23 #include <linux/types.h>
  24 #include <linux/string.h>
  25 #include <linux/kernel.h>
  26 #include <linux/delay.h>
  27 #include <linux/timer.h>
  28 #include <linux/mm.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/major.h>
  31 #include <linux/errno.h>
  32 #include <linux/genhd.h>
  33 #include <linux/slab.h>
  34 #include <linux/cdrom.h>
  35 #include <linux/ide.h>
  36 #include <linux/hdreg.h>
  37 #include <linux/bitops.h>
  38 #include <linux/mutex.h>
  39 #include <linux/scatterlist.h>
  40
  41 #include <scsi/scsi_ioctl.h>
  42
  43 #include <asm/byteorder.h>
  44 #include <linux/irq.h>
  45 #include <linux/uaccess.h>
  46 #include <linux/io.h>
  47 #include <asm/unaligned.h>
  48
  49 #include "ide-floppy.h"
  50
  51 /* define to see debug info */
  52 #define IDEFLOPPY_DEBUG_LOG             0
  53
  54 /* #define IDEFLOPPY_DEBUG(fmt, args...) printk(KERN_INFO fmt, ## args) */
  55 #define IDEFLOPPY_DEBUG(fmt, args...)
  56
  57 #if IDEFLOPPY_DEBUG_LOG
  58 #define debug_log(fmt, args...) \
  59         printk(KERN_INFO "ide-floppy: " fmt, ## args)
  60 #else
  61 #define debug_log(fmt, args...) do {} while (0)
  62 #endif
  63
  64 /*
  65  * After each failed packet command we issue a request sense command and retry
  66  * the packet command IDEFLOPPY_MAX_PC_RETRIES times.
  67  */
  68 #define IDEFLOPPY_MAX_PC_RETRIES        3
  69
  70 /* format capacities descriptor codes */
  71 #define CAPACITY_INVALID        0x00
  72 #define CAPACITY_UNFORMATTED    0x01
  73 #define CAPACITY_CURRENT        0x02
  74 #define CAPACITY_NO_CARTRIDGE   0x03
  75
  76 #define IDEFLOPPY_TICKS_DELAY   HZ/20   /* default delay for ZIP 100 (50ms) */
  77
  78 /* Error code returned in rq->errors to the higher part of the driver. */
  79 #define IDEFLOPPY_ERROR_GENERAL         101
  80
  81 static DEFINE_MUTEX(idefloppy_ref_mutex);
  82
  83 #define to_ide_floppy(obj) container_of(obj, struct ide_floppy_obj, kref)
  84
  85 #define ide_floppy_g(disk) \
  86         container_of((disk)->private_data, struct ide_floppy_obj, driver)
  87
  88 static void idefloppy_cleanup_obj(struct kref *);
  89
  90 static struct ide_floppy_obj *ide_floppy_get(struct gendisk *disk)
  91 {
  92         struct ide_floppy_obj *floppy = NULL;
  93
  94         mutex_lock(&idefloppy_ref_mutex);
  95         floppy = ide_floppy_g(disk);
  96         if (floppy) {
  97                 if (ide_device_get(floppy->drive))
  98                         floppy = NULL;
  99                 else
 100                         kref_get(&floppy->kref);
 101         }
 102         mutex_unlock(&idefloppy_ref_mutex);
 103         return floppy;
 104 }
 105
 106 static void ide_floppy_put(struct ide_floppy_obj *floppy)
 107 {
 108         ide_drive_t *drive = floppy->drive;
 109
 110         mutex_lock(&idefloppy_ref_mutex);
 111         kref_put(&floppy->kref, idefloppy_cleanup_obj);
 112         ide_device_put(drive);
 113         mutex_unlock(&idefloppy_ref_mutex);
 114 }
 115
 116 /*
 117  * Used to finish servicing a request. For read/write requests, we will call
 118  * ide_end_request to pass to the next buffer.
 119  */
 120 static int idefloppy_end_request(ide_drive_t *drive, int uptodate, int nsecs)
 121 {
 122         idefloppy_floppy_t *floppy = drive->driver_data;
 123         struct request *rq = HWGROUP(drive)->rq;
 124         int error;
 125
 126         debug_log("Reached %s\n", __func__);
 127
 128         switch (uptodate) {
 129         case 0: error = IDEFLOPPY_ERROR_GENERAL; break;
 130         case 1: error = 0; break;
 131         default: error = uptodate;
 132         }
 133         if (error)
 134                 floppy->failed_pc = NULL;
 135         /* Why does this happen? */
 136         if (!rq)
 137                 return 0;
 138         if (!blk_special_request(rq)) {
 139                 /* our real local end request function */
 140                 ide_end_request(drive, uptodate, nsecs);
 141                 return 0;
 142         }
 143         rq->errors = error;
 144         /* fixme: need to move this local also */
 145         ide_end_drive_cmd(drive, 0, 0);
 146         return 0;
 147 }
 148
 149 static void idefloppy_update_buffers(ide_drive_t *drive,
 150                                 struct ide_atapi_pc *pc)
 151 {
 152         struct request *rq = pc->rq;
 153         struct bio *bio = rq->bio;
 154
 155         while ((bio = rq->bio) != NULL)
 156                 idefloppy_end_request(drive, 1, 0);
 157 }
 158
 159 static void ide_floppy_callback(ide_drive_t *drive)
 160 {
 161         idefloppy_floppy_t *floppy = drive->driver_data;
 162         struct ide_atapi_pc *pc = floppy->pc;
 163         int uptodate = pc->error ? 0 : 1;
 164
 165         debug_log("Reached %s\n", __func__);
 166
 167         if (floppy->failed_pc == pc)
 168                 floppy->failed_pc = NULL;
 169
 170         if (pc->c[0] == GPCMD_READ_10 || pc->c[0] == GPCMD_WRITE_10 ||
 171             (pc->rq && blk_pc_request(pc->rq)))
 172                 uptodate = 1; /* FIXME */
 173         else if (pc->c[0] == GPCMD_REQUEST_SENSE) {
 174                 u8 *buf = floppy->pc->buf;
 175
 176                 if (!pc->error) {
 177                         floppy->sense_key = buf[2] & 0x0F;
 178                         floppy->asc = buf[12];
 179                         floppy->ascq = buf[13];
 180                         floppy->progress_indication = buf[15] & 0x80 ?
 181                                 (u16)get_unaligned((u16 *)&buf[16]) : 0x10000;
 182
 183                         if (floppy->failed_pc)
 184                                 debug_log("pc = %x, ", floppy->failed_pc->c[0]);
 185
 186                         debug_log("sense key = %x, asc = %x, ascq = %x\n",
 187                                   floppy->sense_key, floppy->asc, floppy->ascq);
 188                 } else
 189                         printk(KERN_ERR "Error in REQUEST SENSE itself - "
 190                                         "Aborting request!\n");
 191         }
 192
 193         idefloppy_end_request(drive, uptodate, 0);
 194 }
 195
 196 void ide_floppy_create_request_sense_cmd(struct ide_atapi_pc *pc)
 197 {
 198         ide_init_pc(pc);
 199         pc->c[0] = GPCMD_REQUEST_SENSE;
 200         pc->c[4] = 255;
 201         pc->req_xfer = 18;
 202 }
 203
 204 /*
 205  * Called when an error was detected during the last packet command. We queue a
 206  * request sense packet command in the head of the request list.
 207  */
 208 static void idefloppy_retry_pc(ide_drive_t *drive)
 209 {
 210         struct ide_floppy_obj *floppy = drive->driver_data;
 211         struct request *rq = &floppy->request_sense_rq;
 212         struct ide_atapi_pc *pc = &floppy->request_sense_pc;
 213
 214         (void)ide_read_error(drive);
 215         ide_floppy_create_request_sense_cmd(pc);
 216         ide_queue_pc_head(drive, floppy->disk, pc, rq);
 217 }
 218
 219 /* The usual interrupt handler called during a packet command. */
 220 static ide_startstop_t idefloppy_pc_intr(ide_drive_t *drive)
 221 {
 222         idefloppy_floppy_t *floppy = drive->driver_data;
 223
 224         return ide_pc_intr(drive, floppy->pc, idefloppy_pc_intr,
 225                            WAIT_FLOPPY_CMD, NULL, idefloppy_update_buffers,
 226                            idefloppy_retry_pc, NULL, ide_io_buffers);
 227 }
 228
 229 /*
 230  * What we have here is a classic case of a top half / bottom half interrupt
 231  * service routine. In interrupt mode, the device sends an interrupt to signal
 232  * that it is ready to receive a packet. However, we need to delay about 2-3
 233  * ticks before issuing the packet or we gets in trouble.
 234  */
 235 static int idefloppy_transfer_pc(ide_drive_t *drive)
 236 {
 237         idefloppy_floppy_t *floppy = drive->driver_data;
 238
 239         /* Send the actual packet */
 240         drive->hwif->tp_ops->output_data(drive, NULL, floppy->pc->c, 12);
 241
 242         /* Timeout for the packet command */
 243         return WAIT_FLOPPY_CMD;
 244 }
 245
 246 /*
 247  * Called as an interrupt (or directly). When the device says it's ready for a
 248  * packet, we schedule the packet transfer to occur about 2-3 ticks later in
 249  * transfer_pc.
 250  */
 251 static ide_startstop_t idefloppy_start_pc_transfer(ide_drive_t *drive)
 252 {
 253         idefloppy_floppy_t *floppy = drive->driver_data;
 254         struct ide_atapi_pc *pc = floppy->pc;
 255         ide_expiry_t *expiry;
 256         unsigned int timeout;
 257
 258         /*
 259          * The following delay solves a problem with ATAPI Zip 100 drives
 260          * where the Busy flag was apparently being deasserted before the
 261          * unit was ready to receive data. This was happening on a
 262          * 1200 MHz Athlon system. 10/26/01 25msec is too short,
 263          * 40 and 50msec work well. idefloppy_pc_intr will not be actually
 264          * used until after the packet is moved in about 50 msec.
 265          */
 266         if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) {
 267                 timeout = floppy->ticks;
 268                 expiry = &idefloppy_transfer_pc;
 269         } else {
 270                 timeout = WAIT_FLOPPY_CMD;
 271                 expiry = NULL;
 272         }
 273
 274         return ide_transfer_pc(drive, pc, idefloppy_pc_intr, timeout, expiry);
 275 }
 276
 277 static void ide_floppy_report_error(idefloppy_floppy_t *floppy,
 278                                     struct ide_atapi_pc *pc)
 279 {
 280         /* supress error messages resulting from Medium not present */
 281         if (floppy->sense_key == 0x02 &&
 282             floppy->asc       == 0x3a &&
 283             floppy->ascq      == 0x00)
 284                 return;
 285
 286         printk(KERN_ERR "ide-floppy: %s: I/O error, pc = %2x, key = %2x, "
 287                         "asc = %2x, ascq = %2x\n",
 288                         floppy->drive->name, pc->c[0], floppy->sense_key,
 289                         floppy->asc, floppy->ascq);
 290
 291 }
 292
 293 static ide_startstop_t idefloppy_issue_pc(ide_drive_t *drive,
 294                 struct ide_atapi_pc *pc)
 295 {
 296         idefloppy_floppy_t *floppy = drive->driver_data;
 297
 298         if (floppy->failed_pc == NULL &&
 299             pc->c[0] != GPCMD_REQUEST_SENSE)
 300                 floppy->failed_pc = pc;
 301         /* Set the current packet command */
 302         floppy->pc = pc;
 303
 304         if (pc->retries > IDEFLOPPY_MAX_PC_RETRIES) {
 305                 if (!(pc->flags & PC_FLAG_SUPPRESS_ERROR))
 306                         ide_floppy_report_error(floppy, pc);
 307                 /* Giving up */
 308                 pc->error = IDEFLOPPY_ERROR_GENERAL;
 309
 310                 floppy->failed_pc = NULL;
 311                 drive->pc_callback(drive);
 312                 return ide_stopped;
 313         }
 314
 315         debug_log("Retry number - %d\n", pc->retries);
 316
 317         pc->retries++;
 318
 319         return ide_issue_pc(drive, pc, idefloppy_start_pc_transfer,
 320                             WAIT_FLOPPY_CMD, NULL);
 321 }
 322
 323 void ide_floppy_create_read_capacity_cmd(struct ide_atapi_pc *pc)
 324 {
 325         ide_init_pc(pc);
 326         pc->c[0] = GPCMD_READ_FORMAT_CAPACITIES;
 327         pc->c[7] = 255;
 328         pc->c[8] = 255;
 329         pc->req_xfer = 255;
 330 }
 331
 332 /* A mode sense command is used to "sense" floppy parameters. */
 333 void ide_floppy_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
 334 {
 335         u16 length = 8; /* sizeof(Mode Parameter Header) = 8 Bytes */
 336
 337         ide_init_pc(pc);
 338         pc->c[0] = GPCMD_MODE_SENSE_10;
 339         pc->c[1] = 0;
 340         pc->c[2] = page_code;
 341
 342         switch (page_code) {
 343         case IDEFLOPPY_CAPABILITIES_PAGE:
 344                 length += 12;
 345                 break;
 346         case IDEFLOPPY_FLEXIBLE_DISK_PAGE:
 347                 length += 32;
 348                 break;
 349         default:
 350                 printk(KERN_ERR "ide-floppy: unsupported page code "
 351                                 "in create_mode_sense_cmd\n");
 352         }
 353         put_unaligned(cpu_to_be16(length), (u16 *) &pc->c[7]);
 354         pc->req_xfer = length;
 355 }
 356
 357 static void idefloppy_create_rw_cmd(idefloppy_floppy_t *floppy,
 358                                     struct ide_atapi_pc *pc, struct request *rq,
 359                                     unsigned long sector)
 360 {
 361         int block = sector / floppy->bs_factor;
 362         int blocks = rq->nr_sectors / floppy->bs_factor;
 363         int cmd = rq_data_dir(rq);
 364
 365         debug_log("create_rw10_cmd: block == %d, blocks == %d\n",
 366                 block, blocks);
 367
 368         ide_init_pc(pc);
 369         pc->c[0] = cmd == READ ? GPCMD_READ_10 : GPCMD_WRITE_10;
 370         put_unaligned(cpu_to_be16(blocks), (unsigned short *)&pc->c[7]);
 371         put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[2]);
 372
 373         memcpy(rq->cmd, pc->c, 12);
 374
 375         pc->rq = rq;
 376         pc->b_count = 0;
 377         if (rq->cmd_flags & REQ_RW)
 378                 pc->flags |= PC_FLAG_WRITING;
 379         pc->buf = NULL;
 380         pc->req_xfer = pc->buf_size = blocks * floppy->block_size;
 381         pc->flags |= PC_FLAG_DMA_OK;
 382 }
 383
 384 static void idefloppy_blockpc_cmd(idefloppy_floppy_t *floppy,
 385                 struct ide_atapi_pc *pc, struct request *rq)
 386 {
 387         ide_init_pc(pc);
 388         memcpy(pc->c, rq->cmd, sizeof(pc->c));
 389         pc->rq = rq;
 390         pc->b_count = 0;
 391         if (rq->data_len && rq_data_dir(rq) == WRITE)
 392                 pc->flags |= PC_FLAG_WRITING;
 393         pc->buf = rq->data;
 394         if (rq->bio)
 395                 pc->flags |= PC_FLAG_DMA_OK;
 396         /*
 397          * possibly problematic, doesn't look like ide-floppy correctly
 398          * handled scattered requests if dma fails...
 399          */
 400         pc->req_xfer = pc->buf_size = rq->data_len;
 401 }
 402
 403 static ide_startstop_t idefloppy_do_request(ide_drive_t *drive,
 404                 struct request *rq, sector_t block_s)
 405 {
 406         idefloppy_floppy_t *floppy = drive->driver_data;
 407         ide_hwif_t *hwif = drive->hwif;
 408         struct ide_atapi_pc *pc;
 409         unsigned long block = (unsigned long)block_s;
 410
 411         debug_log("%s: dev: %s, cmd: 0x%x, cmd_type: %x, errors: %d\n",
 412                   __func__, rq->rq_disk ? rq->rq_disk->disk_name : "?",
 413                   rq->cmd[0], rq->cmd_type, rq->errors);
 414
 415         debug_log("%s: sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",
 416                   __func__, (long)rq->sector, rq->nr_sectors,
 417                   rq->current_nr_sectors);
 418
 419         if (rq->errors >= ERROR_MAX) {
 420                 if (floppy->failed_pc)
 421                         ide_floppy_report_error(floppy, floppy->failed_pc);
 422                 else
 423                         printk(KERN_ERR "ide-floppy: %s: I/O error\n",
 424                                 drive->name);
 425                 idefloppy_end_request(drive, 0, 0);
 426                 return ide_stopped;
 427         }
 428         if (blk_fs_request(rq)) {
 429                 if (((long)rq->sector % floppy->bs_factor) ||
 430                     (rq->nr_sectors % floppy->bs_factor)) {
 431                         printk(KERN_ERR "%s: unsupported r/w request size\n",
 432                                         drive->name);
 433                         idefloppy_end_request(drive, 0, 0);
 434                         return ide_stopped;
 435                 }
 436                 pc = &floppy->queued_pc;
 437                 idefloppy_create_rw_cmd(floppy, pc, rq, block);
 438         } else if (blk_special_request(rq)) {
 439                 pc = (struct ide_atapi_pc *) rq->buffer;
 440         } else if (blk_pc_request(rq)) {
 441                 pc = &floppy->queued_pc;
 442                 idefloppy_blockpc_cmd(floppy, pc, rq);
 443         } else {
 444                 blk_dump_rq_flags(rq,
 445                         "ide-floppy: unsupported command in queue");
 446                 idefloppy_end_request(drive, 0, 0);
 447                 return ide_stopped;
 448         }
 449
 450         ide_init_sg_cmd(drive, rq);
 451         ide_map_sg(drive, rq);
 452
 453         pc->sg = hwif->sg_table;
 454         pc->sg_cnt = hwif->sg_nents;
 455
 456         pc->rq = rq;
 457
 458         return idefloppy_issue_pc(drive, pc);
 459 }
 460
 461 /*
 462  * Look at the flexible disk page parameters. We ignore the CHS capacity
 463  * parameters and use the LBA parameters instead.
 464  */
 465 static int ide_floppy_get_flexible_disk_page(ide_drive_t *drive)
 466 {
 467         idefloppy_floppy_t *floppy = drive->driver_data;
 468         struct gendisk *disk = floppy->disk;
 469         struct ide_atapi_pc pc;
 470         u8 *page;
 471         int capacity, lba_capacity;
 472         u16 transfer_rate, sector_size, cyls, rpm;
 473         u8 heads, sectors;
 474
 475         ide_floppy_create_mode_sense_cmd(&pc, IDEFLOPPY_FLEXIBLE_DISK_PAGE);
 476
 477         if (ide_queue_pc_tail(drive, disk, &pc)) {
 478                 printk(KERN_ERR "ide-floppy: Can't get flexible disk page"
 479                                 " parameters\n");
 480                 return 1;
 481         }
 482
 483         if (pc.buf[3] & 0x80)
 484                 drive->atapi_flags |= IDE_AFLAG_WP;
 485         else
 486                 drive->atapi_flags &= ~IDE_AFLAG_WP;
 487
 488         set_disk_ro(disk, !!(drive->atapi_flags & IDE_AFLAG_WP));
 489
 490         page = &pc.buf[8];
 491
 492         transfer_rate = be16_to_cpup((__be16 *)&pc.buf[8 + 2]);
 493         sector_size   = be16_to_cpup((__be16 *)&pc.buf[8 + 6]);
 494         cyls          = be16_to_cpup((__be16 *)&pc.buf[8 + 8]);
 495         rpm           = be16_to_cpup((__be16 *)&pc.buf[8 + 28]);
 496         heads         = pc.buf[8 + 4];
 497         sectors       = pc.buf[8 + 5];
 498
 499         capacity = cyls * heads * sectors * sector_size;
 500
 501         if (memcmp(page, &floppy->flexible_disk_page, 32))
 502                 printk(KERN_INFO "%s: %dkB, %d/%d/%d CHS, %d kBps, "
 503                                 "%d sector size, %d rpm\n",
 504                                 drive->name, capacity / 1024, cyls, heads,
 505                                 sectors, transfer_rate / 8, sector_size, rpm);
 506
 507         memcpy(&floppy->flexible_disk_page, page, 32);
 508         drive->bios_cyl = cyls;
 509         drive->bios_head = heads;
 510         drive->bios_sect = sectors;
 511         lba_capacity = floppy->blocks * floppy->block_size;
 512
 513         if (capacity < lba_capacity) {
 514                 printk(KERN_NOTICE "%s: The disk reports a capacity of %d "
 515                         "bytes, but the drive only handles %d\n",
 516                         drive->name, lba_capacity, capacity);
 517                 floppy->blocks = floppy->block_size ?
 518                         capacity / floppy->block_size : 0;
 519         }
 520         return 0;
 521 }
 522
 523 /*
 524  * Determine if a media is present in the floppy drive, and if so, its LBA
 525  * capacity.
 526  */
 527 static int ide_floppy_get_capacity(ide_drive_t *drive)
 528 {
 529         idefloppy_floppy_t *floppy = drive->driver_data;
 530         struct gendisk *disk = floppy->disk;
 531         struct ide_atapi_pc pc;
 532         u8 *cap_desc;
 533         u8 header_len, desc_cnt;
 534         int i, rc = 1, blocks, length;
 535
 536         drive->bios_cyl = 0;
 537         drive->bios_head = drive->bios_sect = 0;
 538         floppy->blocks = 0;
 539         floppy->bs_factor = 1;
 540         set_capacity(floppy->disk, 0);
 541
 542         ide_floppy_create_read_capacity_cmd(&pc);
 543         if (ide_queue_pc_tail(drive, disk, &pc)) {
 544                 printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
 545                 return 1;
 546         }
 547         header_len = pc.buf[3];
 548         cap_desc = &pc.buf[4];
 549         desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */
 550
 551         for (i = 0; i < desc_cnt; i++) {
 552                 unsigned int desc_start = 4 + i*8;
 553
 554                 blocks = be32_to_cpup((__be32 *)&pc.buf[desc_start]);
 555                 length = be16_to_cpup((__be16 *)&pc.buf[desc_start + 6]);
 556
 557                 debug_log("Descriptor %d: %dkB, %d blocks, %d sector size\n",
 558                                 i, blocks * length / 1024, blocks, length);
 559
 560                 if (i)
 561                         continue;
 562                 /*
 563                  * the code below is valid only for the 1st descriptor, ie i=0
 564                  */
 565
 566                 switch (pc.buf[desc_start + 4] & 0x03) {
 567                 /* Clik! drive returns this instead of CAPACITY_CURRENT */
 568                 case CAPACITY_UNFORMATTED:
 569                         if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
 570                                 /*
 571                                  * If it is not a clik drive, break out
 572                                  * (maintains previous driver behaviour)
 573                                  */
 574                                 break;
 575                 case CAPACITY_CURRENT:
 576                         /* Normal Zip/LS-120 disks */
 577                         if (memcmp(cap_desc, &floppy->cap_desc, 8))
 578                                 printk(KERN_INFO "%s: %dkB, %d blocks, %d "
 579                                         "sector size\n", drive->name,
 580                                         blocks * length / 1024, blocks, length);
 581                         memcpy(&floppy->cap_desc, cap_desc, 8);
 582
 583                         if (!length || length % 512) {
 584                                 printk(KERN_NOTICE "%s: %d bytes block size "
 585                                         "not supported\n", drive->name, length);
 586                         } else {
 587                                 floppy->blocks = blocks;
 588                                 floppy->block_size = length;
 589                                 floppy->bs_factor = length / 512;
 590                                 if (floppy->bs_factor != 1)
 591                                         printk(KERN_NOTICE "%s: warning: non "
 592                                                 "512 bytes block size not "
 593                                                 "fully supported\n",
 594                                                 drive->name);
 595                                 rc = 0;
 596                         }
 597                         break;
 598                 case CAPACITY_NO_CARTRIDGE:
 599                         /*
 600                          * This is a KERN_ERR so it appears on screen
 601                          * for the user to see
 602                          */
 603                         printk(KERN_ERR "%s: No disk in drive\n", drive->name);
 604                         break;
 605                 case CAPACITY_INVALID:
 606                         printk(KERN_ERR "%s: Invalid capacity for disk "
 607                                 "in drive\n", drive->name);
 608                         break;
 609                 }
 610                 debug_log("Descriptor 0 Code: %d\n",
 611                           pc.buf[desc_start + 4] & 0x03);
 612         }
 613
 614         /* Clik! disk does not support get_flexible_disk_page */
 615         if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
 616                 (void) ide_floppy_get_flexible_disk_page(drive);
 617
 618         set_capacity(disk, floppy->blocks * floppy->bs_factor);
 619
 620         return rc;
 621 }
 622
 623 static sector_t idefloppy_capacity(ide_drive_t *drive)
 624 {
 625         idefloppy_floppy_t *floppy = drive->driver_data;
 626         unsigned long capacity = floppy->blocks * floppy->bs_factor;
 627
 628         return capacity;
 629 }
 630
 631 #ifdef CONFIG_IDE_PROC_FS
 632 ide_devset_rw(bios_cyl,  0, 1023, bios_cyl);
 633 ide_devset_rw(bios_head, 0,  255, bios_head);
 634 ide_devset_rw(bios_sect, 0,   63, bios_sect);
 635
 636 static int get_ticks(ide_drive_t *drive)
 637 {
 638         idefloppy_floppy_t *floppy = drive->driver_data;
 639         return floppy->ticks;
 640 }
 641
 642 static int set_ticks(ide_drive_t *drive, int arg)
 643 {
 644         idefloppy_floppy_t *floppy = drive->driver_data;
 645         floppy->ticks = arg;
 646         return 0;
 647 }
 648
 649 IDE_DEVSET(ticks, S_RW, 0, 255, get_ticks, set_ticks);
 650
 651 static const struct ide_devset *idefloppy_settings[] = {
 652         &ide_devset_bios_cyl,
 653         &ide_devset_bios_head,
 654         &ide_devset_bios_sect,
 655         &ide_devset_ticks,
 656         NULL
 657 };
 658 #endif
 659
 660 static void idefloppy_setup(ide_drive_t *drive, idefloppy_floppy_t *floppy)
 661 {
 662         u16 *id = drive->id;
 663         u8 gcw[2];
 664
 665         *((u16 *)&gcw) = id[ATA_ID_CONFIG];
 666
 667         drive->pc_callback = ide_floppy_callback;
 668
 669         if (((gcw[0] & 0x60) >> 5) == 1)
 670                 drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;
 671         /*
 672          * We used to check revisions here. At this point however I'm giving up.
 673          * Just assume they are all broken, its easier.
 674          *
 675          * The actual reason for the workarounds was likely a driver bug after
 676          * all rather than a firmware bug, and the workaround below used to hide
 677          * it. It should be fixed as of version 1.9, but to be on the safe side
 678          * we'll leave the limitation below for the 2.2.x tree.
 679          */
 680         if (!strncmp((char *)&id[ATA_ID_PROD], "IOMEGA ZIP 100 ATAPI", 20)) {
 681                 drive->atapi_flags |= IDE_AFLAG_ZIP_DRIVE;
 682                 /* This value will be visible in the /proc/ide/hdx/settings */
 683                 floppy->ticks = IDEFLOPPY_TICKS_DELAY;
 684                 blk_queue_max_sectors(drive->queue, 64);
 685         }
 686
 687         /*
 688          * Guess what? The IOMEGA Clik! drive also needs the above fix. It makes
 689          * nasty clicking noises without it, so please don't remove this.
 690          */
 691         if (strncmp((char *)&id[ATA_ID_PROD], "IOMEGA Clik!", 11) == 0) {
 692                 blk_queue_max_sectors(drive->queue, 64);
 693                 drive->atapi_flags |= IDE_AFLAG_CLIK_DRIVE;
 694                 /* IOMEGA Clik! drives do not support lock/unlock commands */
 695                 drive->atapi_flags |= IDE_AFLAG_NO_DOORLOCK;
 696         }
 697
 698         (void) ide_floppy_get_capacity(drive);
 699
 700         ide_proc_register_driver(drive, floppy->driver);
 701 }
 702
 703 static void ide_floppy_remove(ide_drive_t *drive)
 704 {
 705         idefloppy_floppy_t *floppy = drive->driver_data;
 706         struct gendisk *g = floppy->disk;
 707
 708         ide_proc_unregister_driver(drive, floppy->driver);
 709
 710         del_gendisk(g);
 711
 712         ide_floppy_put(floppy);
 713 }
 714
 715 static void idefloppy_cleanup_obj(struct kref *kref)
 716 {
 717         struct ide_floppy_obj *floppy = to_ide_floppy(kref);
 718         ide_drive_t *drive = floppy->drive;
 719         struct gendisk *g = floppy->disk;
 720
 721         drive->driver_data = NULL;
 722         g->private_data = NULL;
 723         put_disk(g);
 724         kfree(floppy);
 725 }
 726
 727 #ifdef CONFIG_IDE_PROC_FS
 728 static int proc_idefloppy_read_capacity(char *page, char **start, off_t off,
 729                 int count, int *eof, void *data)
 730 {
 731         ide_drive_t*drive = (ide_drive_t *)data;
 732         int len;
 733
 734         len = sprintf(page, "%llu\n", (long long)idefloppy_capacity(drive));
 735         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 736 }
 737
 738 static ide_proc_entry_t idefloppy_proc[] = {
 739         { "capacity",   S_IFREG|S_IRUGO, proc_idefloppy_read_capacity,  NULL },
 740         { "geometry",   S_IFREG|S_IRUGO, proc_ide_read_geometry,        NULL },
 741         { NULL, 0, NULL, NULL }
 742 };
 743 #endif  /* CONFIG_IDE_PROC_FS */
 744
 745 static int ide_floppy_probe(ide_drive_t *);
 746
 747 static ide_driver_t idefloppy_driver = {
 748         .gen_driver = {
 749                 .owner          = THIS_MODULE,
 750                 .name           = "ide-floppy",
 751                 .bus            = &ide_bus_type,
 752         },
 753         .probe                  = ide_floppy_probe,
 754         .remove                 = ide_floppy_remove,
 755         .version                = IDEFLOPPY_VERSION,
 756         .media                  = ide_floppy,
 757         .do_request             = idefloppy_do_request,
 758         .end_request            = idefloppy_end_request,
 759         .error                  = __ide_error,
 760 #ifdef CONFIG_IDE_PROC_FS
 761         .proc                   = idefloppy_proc,
 762         .settings               = idefloppy_settings,
 763 #endif
 764 };
 765
 766 static int idefloppy_open(struct inode *inode, struct file *filp)
 767 {
 768         struct gendisk *disk = inode->i_bdev->bd_disk;
 769         struct ide_floppy_obj *floppy;
 770         ide_drive_t *drive;
 771         int ret = 0;
 772
 773         debug_log("Reached %s\n", __func__);
 774
 775         floppy = ide_floppy_get(disk);
 776         if (!floppy)
 777                 return -ENXIO;
 778
 779         drive = floppy->drive;
 780
 781         floppy->openers++;
 782
 783         if (floppy->openers == 1) {
 784                 drive->atapi_flags &= ~IDE_AFLAG_FORMAT_IN_PROGRESS;
 785                 /* Just in case */
 786
 787                 if (ide_do_test_unit_ready(drive, disk))
 788                         ide_do_start_stop(drive, disk, 1);
 789
 790                 if (ide_floppy_get_capacity(drive)
 791                    && (filp->f_flags & O_NDELAY) == 0
 792                     /*
 793                      * Allow O_NDELAY to open a drive without a disk, or with an
 794                      * unreadable disk, so that we can get the format capacity
 795                      * of the drive or begin the format - Sam
 796                      */
 797                     ) {
 798                         ret = -EIO;
 799                         goto out_put_floppy;
 800                 }
 801
 802                 if ((drive->atapi_flags & IDE_AFLAG_WP) && (filp->f_mode & 2)) {
 803                         ret = -EROFS;
 804                         goto out_put_floppy;
 805                 }
 806
 807                 drive->atapi_flags |= IDE_AFLAG_MEDIA_CHANGED;
 808                 ide_set_media_lock(drive, disk, 1);
 809                 check_disk_change(inode->i_bdev);
 810         } else if (drive->atapi_flags & IDE_AFLAG_FORMAT_IN_PROGRESS) {
 811                 ret = -EBUSY;
 812                 goto out_put_floppy;
 813         }
 814         return 0;
 815
 816 out_put_floppy:
 817         floppy->openers--;
 818         ide_floppy_put(floppy);
 819         return ret;
 820 }
 821
 822 static int idefloppy_release(struct inode *inode, struct file *filp)
 823 {
 824         struct gendisk *disk = inode->i_bdev->bd_disk;
 825         struct ide_floppy_obj *floppy = ide_floppy_g(disk);
 826         ide_drive_t *drive = floppy->drive;
 827
 828         debug_log("Reached %s\n", __func__);
 829
 830         if (floppy->openers == 1) {
 831                 ide_set_media_lock(drive, disk, 0);
 832                 drive->atapi_flags &= ~IDE_AFLAG_FORMAT_IN_PROGRESS;
 833         }
 834
 835         floppy->openers--;
 836
 837         ide_floppy_put(floppy);
 838
 839         return 0;
 840 }
 841
 842 static int idefloppy_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 843 {
 844         struct ide_floppy_obj *floppy = ide_floppy_g(bdev->bd_disk);
 845         ide_drive_t *drive = floppy->drive;
 846
 847         geo->heads = drive->bios_head;
 848         geo->sectors = drive->bios_sect;
 849         geo->cylinders = (u16)drive->bios_cyl; /* truncate */
 850         return 0;
 851 }
 852
 853 static int ide_floppy_lockdoor(ide_drive_t *drive, struct ide_atapi_pc *pc,
 854                                unsigned long arg, unsigned int cmd)
 855 {
 856         idefloppy_floppy_t *floppy = drive->driver_data;
 857         struct gendisk *disk = floppy->disk;
 858         int prevent = (arg && cmd != CDROMEJECT) ? 1 : 0;
 859
 860         if (floppy->openers > 1)
 861                 return -EBUSY;
 862
 863         ide_set_media_lock(drive, disk, prevent);
 864
 865         if (cmd == CDROMEJECT)
 866                 ide_do_start_stop(drive, disk, 2);
 867
 868         return 0;
 869 }
 870
 871 static int idefloppy_ioctl(struct inode *inode, struct file *file,
 872                         unsigned int cmd, unsigned long arg)
 873 {
 874         struct block_device *bdev = inode->i_bdev;
 875         struct ide_floppy_obj *floppy = ide_floppy_g(bdev->bd_disk);
 876         ide_drive_t *drive = floppy->drive;
 877         struct ide_atapi_pc pc;
 878         void __user *argp = (void __user *)arg;
 879         int err;
 880
 881         if (cmd == CDROMEJECT || cmd == CDROM_LOCKDOOR)
 882                 return ide_floppy_lockdoor(drive, &pc, arg, cmd);
 883
 884         err = ide_floppy_format_ioctl(drive, file, cmd, argp);
 885         if (err != -ENOTTY)
 886                 return err;
 887
 888         /*
 889          * skip SCSI_IOCTL_SEND_COMMAND (deprecated)
 890          * and CDROM_SEND_PACKET (legacy) ioctls
 891          */
 892         if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND)
 893                 err = scsi_cmd_ioctl(file, bdev->bd_disk->queue,
 894                                         bdev->bd_disk, cmd, argp);
 895
 896         if (err == -ENOTTY)
 897                 err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
 898
 899         return err;
 900 }
 901
 902 static int idefloppy_media_changed(struct gendisk *disk)
 903 {
 904         struct ide_floppy_obj *floppy = ide_floppy_g(disk);
 905         ide_drive_t *drive = floppy->drive;
 906         int ret;
 907
 908         /* do not scan partitions twice if this is a removable device */
 909         if (drive->attach) {
 910                 drive->attach = 0;
 911                 return 0;
 912         }
 913         ret = !!(drive->atapi_flags & IDE_AFLAG_MEDIA_CHANGED);
 914         drive->atapi_flags &= ~IDE_AFLAG_MEDIA_CHANGED;
 915         return ret;
 916 }
 917
 918 static int idefloppy_revalidate_disk(struct gendisk *disk)
 919 {
 920         struct ide_floppy_obj *floppy = ide_floppy_g(disk);
 921         set_capacity(disk, idefloppy_capacity(floppy->drive));
 922         return 0;
 923 }
 924
 925 static struct block_device_operations idefloppy_ops = {
 926         .owner                  = THIS_MODULE,
 927         .open                   = idefloppy_open,
 928         .release                = idefloppy_release,
 929         .ioctl                  = idefloppy_ioctl,
 930         .getgeo                 = idefloppy_getgeo,
 931         .media_changed          = idefloppy_media_changed,
 932         .revalidate_disk        = idefloppy_revalidate_disk
 933 };
 934
 935 static int ide_floppy_probe(ide_drive_t *drive)
 936 {
 937         idefloppy_floppy_t *floppy;
 938         struct gendisk *g;
 939
 940         if (!strstr("ide-floppy", drive->driver_req))
 941                 goto failed;
 942
 943         if (drive->media != ide_floppy)
 944                 goto failed;
 945
 946         if (!ide_check_atapi_device(drive, DRV_NAME)) {
 947                 printk(KERN_ERR "ide-floppy: %s: not supported by this version"
 948                                 " of ide-floppy\n", drive->name);
 949                 goto failed;
 950         }
 951         floppy = kzalloc(sizeof(idefloppy_floppy_t), GFP_KERNEL);
 952         if (!floppy) {
 953                 printk(KERN_ERR "ide-floppy: %s: Can't allocate a floppy"
 954                                 " structure\n", drive->name);
 955                 goto failed;
 956         }
 957
 958         g = alloc_disk(1 << PARTN_BITS);
 959         if (!g)
 960                 goto out_free_floppy;
 961
 962         ide_init_disk(g, drive);
 963
 964         kref_init(&floppy->kref);
 965
 966         floppy->drive = drive;
 967         floppy->driver = &idefloppy_driver;
 968         floppy->disk = g;
 969
 970         g->private_data = &floppy->driver;
 971
 972         drive->driver_data = floppy;
 973
 974         idefloppy_setup(drive, floppy);
 975
 976         g->minors = 1 << PARTN_BITS;
 977         g->driverfs_dev = &drive->gendev;
 978         g->flags = drive->removable ? GENHD_FL_REMOVABLE : 0;
 979         g->fops = &idefloppy_ops;
 980         drive->attach = 1;
 981         add_disk(g);
 982         return 0;
 983
 984 out_free_floppy:
 985         kfree(floppy);
 986 failed:
 987         return -ENODEV;
 988 }
 989
 990 static void __exit idefloppy_exit(void)
 991 {
 992         driver_unregister(&idefloppy_driver.gen_driver);
 993 }
 994
 995 static int __init idefloppy_init(void)
 996 {
 997         printk("ide-floppy driver " IDEFLOPPY_VERSION "\n");
 998         return driver_register(&idefloppy_driver.gen_driver);
 999 }
1000
1001 MODULE_ALIAS("ide:*m-floppy*");
1002 MODULE_ALIAS("ide-floppy");
1003 module_init(idefloppy_init);
1004 module_exit(idefloppy_exit);
1005 MODULE_LICENSE("GPL");
1006 MODULE_DESCRIPTION("ATAPI FLOPPY Driver");
1007