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 /* Some drives require a longer irq timeout. */
  66 #define IDEFLOPPY_WAIT_CMD              (5 * WAIT_CMD)
  67
  68 /*
  69  * After each failed packet command we issue a request sense command and retry
  70  * the packet command IDEFLOPPY_MAX_PC_RETRIES times.
  71  */
  72 #define IDEFLOPPY_MAX_PC_RETRIES        3
  73
  74 /* format capacities descriptor codes */
  75 #define CAPACITY_INVALID        0x00
  76 #define CAPACITY_UNFORMATTED    0x01
  77 #define CAPACITY_CURRENT        0x02
  78 #define CAPACITY_NO_CARTRIDGE   0x03
  79
  80 #define IDEFLOPPY_TICKS_DELAY   HZ/20   /* default delay for ZIP 100 (50ms) */
  81
  82 /* Error code returned in rq->errors to the higher part of the driver. */
  83 #define IDEFLOPPY_ERROR_GENERAL         101
  84
  85 static DEFINE_MUTEX(idefloppy_ref_mutex);
  86
  87 #define to_ide_floppy(obj) container_of(obj, struct ide_floppy_obj, kref)
  88
  89 #define ide_floppy_g(disk) \
  90         container_of((disk)->private_data, struct ide_floppy_obj, driver)
  91
  92 static void idefloppy_cleanup_obj(struct kref *);
  93
  94 static struct ide_floppy_obj *ide_floppy_get(struct gendisk *disk)
  95 {
  96         struct ide_floppy_obj *floppy = NULL;
  97
  98         mutex_lock(&idefloppy_ref_mutex);
  99         floppy = ide_floppy_g(disk);
 100         if (floppy) {
 101                 if (ide_device_get(floppy->drive))
 102                         floppy = NULL;
 103                 else
 104                         kref_get(&floppy->kref);
 105         }
 106         mutex_unlock(&idefloppy_ref_mutex);
 107         return floppy;
 108 }
 109
 110 static void ide_floppy_put(struct ide_floppy_obj *floppy)
 111 {
 112         ide_drive_t *drive = floppy->drive;
 113
 114         mutex_lock(&idefloppy_ref_mutex);
 115         kref_put(&floppy->kref, idefloppy_cleanup_obj);
 116         ide_device_put(drive);
 117         mutex_unlock(&idefloppy_ref_mutex);
 118 }
 119
 120 /*
 121  * Used to finish servicing a request. For read/write requests, we will call
 122  * ide_end_request to pass to the next buffer.
 123  */
 124 static int idefloppy_end_request(ide_drive_t *drive, int uptodate, int nsecs)
 125 {
 126         idefloppy_floppy_t *floppy = drive->driver_data;
 127         struct request *rq = HWGROUP(drive)->rq;
 128         int error;
 129
 130         debug_log("Reached %s\n", __func__);
 131
 132         switch (uptodate) {
 133         case 0: error = IDEFLOPPY_ERROR_GENERAL; break;
 134         case 1: error = 0; break;
 135         default: error = uptodate;
 136         }
 137         if (error)
 138                 floppy->failed_pc = NULL;
 139         /* Why does this happen? */
 140         if (!rq)
 141                 return 0;
 142         if (!blk_special_request(rq)) {
 143                 /* our real local end request function */
 144                 ide_end_request(drive, uptodate, nsecs);
 145                 return 0;
 146         }
 147         rq->errors = error;
 148         /* fixme: need to move this local also */
 149         ide_end_drive_cmd(drive, 0, 0);
 150         return 0;
 151 }
 152
 153 static void idefloppy_update_buffers(ide_drive_t *drive,
 154                                 struct ide_atapi_pc *pc)
 155 {
 156         struct request *rq = pc->rq;
 157         struct bio *bio = rq->bio;
 158
 159         while ((bio = rq->bio) != NULL)
 160                 idefloppy_end_request(drive, 1, 0);
 161 }
 162
 163 static void ide_floppy_callback(ide_drive_t *drive)
 164 {
 165         idefloppy_floppy_t *floppy = drive->driver_data;
 166         struct ide_atapi_pc *pc = floppy->pc;
 167         int uptodate = pc->error ? 0 : 1;
 168
 169         debug_log("Reached %s\n", __func__);
 170
 171         if (floppy->failed_pc == pc)
 172                 floppy->failed_pc = NULL;
 173
 174         if (pc->c[0] == GPCMD_READ_10 || pc->c[0] == GPCMD_WRITE_10 ||
 175             (pc->rq && blk_pc_request(pc->rq)))
 176                 uptodate = 1; /* FIXME */
 177         else if (pc->c[0] == GPCMD_REQUEST_SENSE) {
 178                 u8 *buf = floppy->pc->buf;
 179
 180                 if (!pc->error) {
 181                         floppy->sense_key = buf[2] & 0x0F;
 182                         floppy->asc = buf[12];
 183                         floppy->ascq = buf[13];
 184                         floppy->progress_indication = buf[15] & 0x80 ?
 185                                 (u16)get_unaligned((u16 *)&buf[16]) : 0x10000;
 186
 187                         if (floppy->failed_pc)
 188                                 debug_log("pc = %x, ", floppy->failed_pc->c[0]);
 189
 190                         debug_log("sense key = %x, asc = %x, ascq = %x\n",
 191                                   floppy->sense_key, floppy->asc, floppy->ascq);
 192                 } else
 193                         printk(KERN_ERR "Error in REQUEST SENSE itself - "
 194                                         "Aborting request!\n");
 195         }
 196
 197         idefloppy_end_request(drive, uptodate, 0);
 198 }
 199
 200 void ide_floppy_create_request_sense_cmd(struct ide_atapi_pc *pc)
 201 {
 202         ide_init_pc(pc);
 203         pc->c[0] = GPCMD_REQUEST_SENSE;
 204         pc->c[4] = 255;
 205         pc->req_xfer = 18;
 206 }
 207
 208 /*
 209  * Called when an error was detected during the last packet command. We queue a
 210  * request sense packet command in the head of the request list.
 211  */
 212 static void idefloppy_retry_pc(ide_drive_t *drive)
 213 {
 214         struct ide_floppy_obj *floppy = drive->driver_data;
 215         struct request *rq = &floppy->request_sense_rq;
 216         struct ide_atapi_pc *pc = &floppy->request_sense_pc;
 217
 218         (void)ide_read_error(drive);
 219         ide_floppy_create_request_sense_cmd(pc);
 220         ide_queue_pc_head(drive, floppy->disk, pc, rq);
 221 }
 222
 223 /* The usual interrupt handler called during a packet command. */
 224 static ide_startstop_t idefloppy_pc_intr(ide_drive_t *drive)
 225 {
 226         idefloppy_floppy_t *floppy = drive->driver_data;
 227
 228         return ide_pc_intr(drive, floppy->pc, idefloppy_pc_intr,
 229                            IDEFLOPPY_WAIT_CMD, NULL, idefloppy_update_buffers,
 230                            idefloppy_retry_pc, NULL, ide_io_buffers);
 231 }
 232
 233 /*
 234  * What we have here is a classic case of a top half / bottom half interrupt
 235  * service routine. In interrupt mode, the device sends an interrupt to signal
 236  * that it is ready to receive a packet. However, we need to delay about 2-3
 237  * ticks before issuing the packet or we gets in trouble.
 238  */
 239 static int idefloppy_transfer_pc(ide_drive_t *drive)
 240 {
 241         idefloppy_floppy_t *floppy = drive->driver_data;
 242
 243         /* Send the actual packet */
 244         drive->hwif->tp_ops->output_data(drive, NULL, floppy->pc->c, 12);
 245
 246         /* Timeout for the packet command */
 247         return IDEFLOPPY_WAIT_CMD;
 248 }
 249
 250
 251 /*
 252  * Called as an interrupt (or directly). When the device says it's ready for a
 253  * packet, we schedule the packet transfer to occur about 2-3 ticks later in
 254  * transfer_pc.
 255  */
 256 static ide_startstop_t idefloppy_start_pc_transfer(ide_drive_t *drive)
 257 {
 258         idefloppy_floppy_t *floppy = drive->driver_data;
 259         struct ide_atapi_pc *pc = floppy->pc;
 260         ide_expiry_t *expiry;
 261         unsigned int timeout;
 262
 263         /*
 264          * The following delay solves a problem with ATAPI Zip 100 drives
 265          * where the Busy flag was apparently being deasserted before the
 266          * unit was ready to receive data. This was happening on a
 267          * 1200 MHz Athlon system. 10/26/01 25msec is too short,
 268          * 40 and 50msec work well. idefloppy_pc_intr will not be actually
 269          * used until after the packet is moved in about 50 msec.
 270          */
 271         if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) {
 272                 timeout = floppy->ticks;
 273                 expiry = &idefloppy_transfer_pc;
 274         } else {
 275                 timeout = IDEFLOPPY_WAIT_CMD;
 276                 expiry = NULL;
 277         }
 278
 279         return ide_transfer_pc(drive, pc, idefloppy_pc_intr, timeout, expiry);
 280 }
 281
 282 static void ide_floppy_report_error(idefloppy_floppy_t *floppy,
 283                                     struct ide_atapi_pc *pc)
 284 {
 285         /* supress error messages resulting from Medium not present */
 286         if (floppy->sense_key == 0x02 &&
 287             floppy->asc       == 0x3a &&
 288             floppy->ascq      == 0x00)
 289                 return;
 290
 291         printk(KERN_ERR "ide-floppy: %s: I/O error, pc = %2x, key = %2x, "
 292                         "asc = %2x, ascq = %2x\n",
 293                         floppy->drive->name, pc->c[0], floppy->sense_key,
 294                         floppy->asc, floppy->ascq);
 295
 296 }
 297
 298 static ide_startstop_t idefloppy_issue_pc(ide_drive_t *drive,
 299                 struct ide_atapi_pc *pc)
 300 {
 301         idefloppy_floppy_t *floppy = drive->driver_data;
 302
 303         if (floppy->failed_pc == NULL &&
 304             pc->c[0] != GPCMD_REQUEST_SENSE)
 305                 floppy->failed_pc = pc;
 306         /* Set the current packet command */
 307         floppy->pc = pc;
 308
 309         if (pc->retries > IDEFLOPPY_MAX_PC_RETRIES) {
 310                 if (!(pc->flags & PC_FLAG_SUPPRESS_ERROR))
 311                         ide_floppy_report_error(floppy, pc);
 312                 /* Giving up */
 313                 pc->error = IDEFLOPPY_ERROR_GENERAL;
 314
 315                 floppy->failed_pc = NULL;
 316                 drive->pc_callback(drive);
 317                 return ide_stopped;
 318         }
 319
 320         debug_log("Retry number - %d\n", pc->retries);
 321
 322         pc->retries++;
 323
 324         return ide_issue_pc(drive, pc, idefloppy_start_pc_transfer,
 325                             IDEFLOPPY_WAIT_CMD, NULL);
 326 }
 327
 328 void ide_floppy_create_read_capacity_cmd(struct ide_atapi_pc *pc)
 329 {
 330         ide_init_pc(pc);
 331         pc->c[0] = GPCMD_READ_FORMAT_CAPACITIES;
 332         pc->c[7] = 255;
 333         pc->c[8] = 255;
 334         pc->req_xfer = 255;
 335 }
 336
 337 /* A mode sense command is used to "sense" floppy parameters. */
 338 void ide_floppy_create_mode_sense_cmd(struct ide_atapi_pc *pc, u8 page_code)
 339 {
 340         u16 length = 8; /* sizeof(Mode Parameter Header) = 8 Bytes */
 341
 342         ide_init_pc(pc);
 343         pc->c[0] = GPCMD_MODE_SENSE_10;
 344         pc->c[1] = 0;
 345         pc->c[2] = page_code;
 346
 347         switch (page_code) {
 348         case IDEFLOPPY_CAPABILITIES_PAGE:
 349                 length += 12;
 350                 break;
 351         case IDEFLOPPY_FLEXIBLE_DISK_PAGE:
 352                 length += 32;
 353                 break;
 354         default:
 355                 printk(KERN_ERR "ide-floppy: unsupported page code "
 356                                 "in create_mode_sense_cmd\n");
 357         }
 358         put_unaligned(cpu_to_be16(length), (u16 *) &pc->c[7]);
 359         pc->req_xfer = length;
 360 }
 361
 362 static void idefloppy_create_rw_cmd(idefloppy_floppy_t *floppy,
 363                                     struct ide_atapi_pc *pc, struct request *rq,
 364                                     unsigned long sector)
 365 {
 366         int block = sector / floppy->bs_factor;
 367         int blocks = rq->nr_sectors / floppy->bs_factor;
 368         int cmd = rq_data_dir(rq);
 369
 370         debug_log("create_rw10_cmd: block == %d, blocks == %d\n",
 371                 block, blocks);
 372
 373         ide_init_pc(pc);
 374         pc->c[0] = cmd == READ ? GPCMD_READ_10 : GPCMD_WRITE_10;
 375         put_unaligned(cpu_to_be16(blocks), (unsigned short *)&pc->c[7]);
 376         put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[2]);
 377
 378         memcpy(rq->cmd, pc->c, 12);
 379
 380         pc->rq = rq;
 381         pc->b_count = 0;
 382         if (rq->cmd_flags & REQ_RW)
 383                 pc->flags |= PC_FLAG_WRITING;
 384         pc->buf = NULL;
 385         pc->req_xfer = pc->buf_size = blocks * floppy->block_size;
 386         pc->flags |= PC_FLAG_DMA_OK;
 387 }
 388
 389 static void idefloppy_blockpc_cmd(idefloppy_floppy_t *floppy,
 390                 struct ide_atapi_pc *pc, struct request *rq)
 391 {
 392         ide_init_pc(pc);
 393         memcpy(pc->c, rq->cmd, sizeof(pc->c));
 394         pc->rq = rq;
 395         pc->b_count = 0;
 396         if (rq->data_len && rq_data_dir(rq) == WRITE)
 397                 pc->flags |= PC_FLAG_WRITING;
 398         pc->buf = rq->data;
 399         if (rq->bio)
 400                 pc->flags |= PC_FLAG_DMA_OK;
 401         /*
 402          * possibly problematic, doesn't look like ide-floppy correctly
 403          * handled scattered requests if dma fails...
 404          */
 405         pc->req_xfer = pc->buf_size = rq->data_len;
 406 }
 407
 408 static ide_startstop_t idefloppy_do_request(ide_drive_t *drive,
 409                 struct request *rq, sector_t block_s)
 410 {
 411         idefloppy_floppy_t *floppy = drive->driver_data;
 412         ide_hwif_t *hwif = drive->hwif;
 413         struct ide_atapi_pc *pc;
 414         unsigned long block = (unsigned long)block_s;
 415
 416         debug_log("%s: dev: %s, cmd: 0x%x, cmd_type: %x, errors: %d\n",
 417                   __func__, rq->rq_disk ? rq->rq_disk->disk_name : "?",
 418                   rq->cmd[0], rq->cmd_type, rq->errors);
 419
 420         debug_log("%s: sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",
 421                   __func__, (long)rq->sector, rq->nr_sectors,
 422                   rq->current_nr_sectors);
 423
 424         if (rq->errors >= ERROR_MAX) {
 425                 if (floppy->failed_pc)
 426                         ide_floppy_report_error(floppy, floppy->failed_pc);
 427                 else
 428                         printk(KERN_ERR "ide-floppy: %s: I/O error\n",
 429                                 drive->name);
 430                 idefloppy_end_request(drive, 0, 0);
 431                 return ide_stopped;
 432         }
 433         if (blk_fs_request(rq)) {
 434                 if (((long)rq->sector % floppy->bs_factor) ||
 435                     (rq->nr_sectors % floppy->bs_factor)) {
 436                         printk(KERN_ERR "%s: unsupported r/w request size\n",
 437                                         drive->name);
 438                         idefloppy_end_request(drive, 0, 0);
 439                         return ide_stopped;
 440                 }
 441                 pc = &floppy->queued_pc;
 442                 idefloppy_create_rw_cmd(floppy, pc, rq, block);
 443         } else if (blk_special_request(rq)) {
 444                 pc = (struct ide_atapi_pc *) rq->buffer;
 445         } else if (blk_pc_request(rq)) {
 446                 pc = &floppy->queued_pc;
 447                 idefloppy_blockpc_cmd(floppy, pc, rq);
 448         } else {
 449                 blk_dump_rq_flags(rq,
 450                         "ide-floppy: unsupported command in queue");
 451                 idefloppy_end_request(drive, 0, 0);
 452                 return ide_stopped;
 453         }
 454
 455         ide_init_sg_cmd(drive, rq);
 456         ide_map_sg(drive, rq);
 457
 458         pc->sg = hwif->sg_table;
 459         pc->sg_cnt = hwif->sg_nents;
 460
 461         pc->rq = rq;
 462
 463         return idefloppy_issue_pc(drive, pc);
 464 }
 465
 466 /*
 467  * Look at the flexible disk page parameters. We ignore the CHS capacity
 468  * parameters and use the LBA parameters instead.
 469  */
 470 static int ide_floppy_get_flexible_disk_page(ide_drive_t *drive)
 471 {
 472         idefloppy_floppy_t *floppy = drive->driver_data;
 473         struct gendisk *disk = floppy->disk;
 474         struct ide_atapi_pc pc;
 475         u8 *page;
 476         int capacity, lba_capacity;
 477         u16 transfer_rate, sector_size, cyls, rpm;
 478         u8 heads, sectors;
 479
 480         ide_floppy_create_mode_sense_cmd(&pc, IDEFLOPPY_FLEXIBLE_DISK_PAGE);
 481
 482         if (ide_queue_pc_tail(drive, disk, &pc)) {
 483                 printk(KERN_ERR "ide-floppy: Can't get flexible disk page"
 484                                 " parameters\n");
 485                 return 1;
 486         }
 487
 488         if (pc.buf[3] & 0x80)
 489                 drive->atapi_flags |= IDE_AFLAG_WP;
 490         else
 491                 drive->atapi_flags &= ~IDE_AFLAG_WP;
 492
 493         set_disk_ro(disk, !!(drive->atapi_flags & IDE_AFLAG_WP));
 494
 495         page = &pc.buf[8];
 496
 497         transfer_rate = be16_to_cpup((__be16 *)&pc.buf[8 + 2]);
 498         sector_size   = be16_to_cpup((__be16 *)&pc.buf[8 + 6]);
 499         cyls          = be16_to_cpup((__be16 *)&pc.buf[8 + 8]);
 500         rpm           = be16_to_cpup((__be16 *)&pc.buf[8 + 28]);
 501         heads         = pc.buf[8 + 4];
 502         sectors       = pc.buf[8 + 5];
 503
 504         capacity = cyls * heads * sectors * sector_size;
 505
 506         if (memcmp(page, &floppy->flexible_disk_page, 32))
 507                 printk(KERN_INFO "%s: %dkB, %d/%d/%d CHS, %d kBps, "
 508                                 "%d sector size, %d rpm\n",
 509                                 drive->name, capacity / 1024, cyls, heads,
 510                                 sectors, transfer_rate / 8, sector_size, rpm);
 511
 512         memcpy(&floppy->flexible_disk_page, page, 32);
 513         drive->bios_cyl = cyls;
 514         drive->bios_head = heads;
 515         drive->bios_sect = sectors;
 516         lba_capacity = floppy->blocks * floppy->block_size;
 517
 518         if (capacity < lba_capacity) {
 519                 printk(KERN_NOTICE "%s: The disk reports a capacity of %d "
 520                         "bytes, but the drive only handles %d\n",
 521                         drive->name, lba_capacity, capacity);
 522                 floppy->blocks = floppy->block_size ?
 523                         capacity / floppy->block_size : 0;
 524         }
 525         return 0;
 526 }
 527
 528 /*
 529  * Determine if a media is present in the floppy drive, and if so, its LBA
 530  * capacity.
 531  */
 532 static int ide_floppy_get_capacity(ide_drive_t *drive)
 533 {
 534         idefloppy_floppy_t *floppy = drive->driver_data;
 535         struct gendisk *disk = floppy->disk;
 536         struct ide_atapi_pc pc;
 537         u8 *cap_desc;
 538         u8 header_len, desc_cnt;
 539         int i, rc = 1, blocks, length;
 540
 541         drive->bios_cyl = 0;
 542         drive->bios_head = drive->bios_sect = 0;
 543         floppy->blocks = 0;
 544         floppy->bs_factor = 1;
 545         set_capacity(floppy->disk, 0);
 546
 547         ide_floppy_create_read_capacity_cmd(&pc);
 548         if (ide_queue_pc_tail(drive, disk, &pc)) {
 549                 printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
 550                 return 1;
 551         }
 552         header_len = pc.buf[3];
 553         cap_desc = &pc.buf[4];
 554         desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */
 555
 556         for (i = 0; i < desc_cnt; i++) {
 557                 unsigned int desc_start = 4 + i*8;
 558
 559                 blocks = be32_to_cpup((__be32 *)&pc.buf[desc_start]);
 560                 length = be16_to_cpup((__be16 *)&pc.buf[desc_start + 6]);
 561
 562                 debug_log("Descriptor %d: %dkB, %d blocks, %d sector size\n",
 563                                 i, blocks * length / 1024, blocks, length);
 564
 565                 if (i)
 566                         continue;
 567                 /*
 568                  * the code below is valid only for the 1st descriptor, ie i=0
 569                  */
 570
 571                 switch (pc.buf[desc_start + 4] & 0x03) {
 572                 /* Clik! drive returns this instead of CAPACITY_CURRENT */
 573                 case CAPACITY_UNFORMATTED:
 574                         if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
 575                                 /*
 576                                  * If it is not a clik drive, break out
 577                                  * (maintains previous driver behaviour)
 578                                  */
 579                                 break;
 580                 case CAPACITY_CURRENT:
 581                         /* Normal Zip/LS-120 disks */
 582                         if (memcmp(cap_desc, &floppy->cap_desc, 8))
 583                                 printk(KERN_INFO "%s: %dkB, %d blocks, %d "
 584                                         "sector size\n", drive->name,
 585                                         blocks * length / 1024, blocks, length);
 586                         memcpy(&floppy->cap_desc, cap_desc, 8);
 587
 588                         if (!length || length % 512) {
 589                                 printk(KERN_NOTICE "%s: %d bytes block size "
 590                                         "not supported\n", drive->name, length);
 591                         } else {
 592                                 floppy->blocks = blocks;
 593                                 floppy->block_size = length;
 594                                 floppy->bs_factor = length / 512;
 595                                 if (floppy->bs_factor != 1)
 596                                         printk(KERN_NOTICE "%s: warning: non "
 597                                                 "512 bytes block size not "
 598                                                 "fully supported\n",
 599                                                 drive->name);
 600                                 rc = 0;
 601                         }
 602                         break;
 603                 case CAPACITY_NO_CARTRIDGE:
 604                         /*
 605                          * This is a KERN_ERR so it appears on screen
 606                          * for the user to see
 607                          */
 608                         printk(KERN_ERR "%s: No disk in drive\n", drive->name);
 609                         break;
 610                 case CAPACITY_INVALID:
 611                         printk(KERN_ERR "%s: Invalid capacity for disk "
 612                                 "in drive\n", drive->name);
 613                         break;
 614                 }
 615                 debug_log("Descriptor 0 Code: %d\n",
 616                           pc.buf[desc_start + 4] & 0x03);
 617         }
 618
 619         /* Clik! disk does not support get_flexible_disk_page */
 620         if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
 621                 (void) ide_floppy_get_flexible_disk_page(drive);
 622
 623         set_capacity(disk, floppy->blocks * floppy->bs_factor);
 624
 625         return rc;
 626 }
 627
 628 static sector_t idefloppy_capacity(ide_drive_t *drive)
 629 {
 630         idefloppy_floppy_t *floppy = drive->driver_data;
 631         unsigned long capacity = floppy->blocks * floppy->bs_factor;
 632
 633         return capacity;
 634 }
 635
 636 #ifdef CONFIG_IDE_PROC_FS
 637 ide_devset_rw(bios_cyl,  0, 1023, bios_cyl);
 638 ide_devset_rw(bios_head, 0,  255, bios_head);
 639 ide_devset_rw(bios_sect, 0,   63, bios_sect);
 640
 641 static int get_ticks(ide_drive_t *drive)
 642 {
 643         idefloppy_floppy_t *floppy = drive->driver_data;
 644         return floppy->ticks;
 645 }
 646
 647 static int set_ticks(ide_drive_t *drive, int arg)
 648 {
 649         idefloppy_floppy_t *floppy = drive->driver_data;
 650         floppy->ticks = arg;
 651         return 0;
 652 }
 653
 654 IDE_DEVSET(ticks, S_RW, 0, 255, get_ticks, set_ticks);
 655
 656 static const struct ide_devset *idefloppy_settings[] = {
 657         &ide_devset_bios_cyl,
 658         &ide_devset_bios_head,
 659         &ide_devset_bios_sect,
 660         &ide_devset_ticks,
 661         NULL
 662 };
 663 #endif
 664
 665 static void idefloppy_setup(ide_drive_t *drive, idefloppy_floppy_t *floppy)
 666 {
 667         u16 *id = drive->id;
 668         u8 gcw[2];
 669
 670         *((u16 *)&gcw) = id[ATA_ID_CONFIG];
 671
 672         drive->pc_callback = ide_floppy_callback;
 673
 674         if (((gcw[0] & 0x60) >> 5) == 1)
 675                 drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;
 676         /*
 677          * We used to check revisions here. At this point however I'm giving up.
 678          * Just assume they are all broken, its easier.
 679          *
 680          * The actual reason for the workarounds was likely a driver bug after
 681          * all rather than a firmware bug, and the workaround below used to hide
 682          * it. It should be fixed as of version 1.9, but to be on the safe side
 683          * we'll leave the limitation below for the 2.2.x tree.
 684          */
 685         if (!strncmp((char *)&id[ATA_ID_PROD], "IOMEGA ZIP 100 ATAPI", 20)) {
 686                 drive->atapi_flags |= IDE_AFLAG_ZIP_DRIVE;
 687                 /* This value will be visible in the /proc/ide/hdx/settings */
 688                 floppy->ticks = IDEFLOPPY_TICKS_DELAY;
 689                 blk_queue_max_sectors(drive->queue, 64);
 690         }
 691
 692         /*
 693          * Guess what? The IOMEGA Clik! drive also needs the above fix. It makes
 694          * nasty clicking noises without it, so please don't remove this.
 695          */
 696         if (strncmp((char *)&id[ATA_ID_PROD], "IOMEGA Clik!", 11) == 0) {
 697                 blk_queue_max_sectors(drive->queue, 64);
 698                 drive->atapi_flags |= IDE_AFLAG_CLIK_DRIVE;
 699                 /* IOMEGA Clik! drives do not support lock/unlock commands */
 700                 drive->atapi_flags |= IDE_AFLAG_NO_DOORLOCK;
 701         }
 702
 703         (void) ide_floppy_get_capacity(drive);
 704
 705         ide_proc_register_driver(drive, floppy->driver);
 706 }
 707
 708 static void ide_floppy_remove(ide_drive_t *drive)
 709 {
 710         idefloppy_floppy_t *floppy = drive->driver_data;
 711         struct gendisk *g = floppy->disk;
 712
 713         ide_proc_unregister_driver(drive, floppy->driver);
 714
 715         del_gendisk(g);
 716
 717         ide_floppy_put(floppy);
 718 }
 719
 720 static void idefloppy_cleanup_obj(struct kref *kref)
 721 {
 722         struct ide_floppy_obj *floppy = to_ide_floppy(kref);
 723         ide_drive_t *drive = floppy->drive;
 724         struct gendisk *g = floppy->disk;
 725
 726         drive->driver_data = NULL;
 727         g->private_data = NULL;
 728         put_disk(g);
 729         kfree(floppy);
 730 }
 731
 732 #ifdef CONFIG_IDE_PROC_FS
 733 static int proc_idefloppy_read_capacity(char *page, char **start, off_t off,
 734                 int count, int *eof, void *data)
 735 {
 736         ide_drive_t*drive = (ide_drive_t *)data;
 737         int len;
 738
 739         len = sprintf(page, "%llu\n", (long long)idefloppy_capacity(drive));
 740         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
 741 }
 742
 743 static ide_proc_entry_t idefloppy_proc[] = {
 744         { "capacity",   S_IFREG|S_IRUGO, proc_idefloppy_read_capacity,  NULL },
 745         { "geometry",   S_IFREG|S_IRUGO, proc_ide_read_geometry,        NULL },
 746         { NULL, 0, NULL, NULL }
 747 };
 748 #endif  /* CONFIG_IDE_PROC_FS */
 749
 750 static int ide_floppy_probe(ide_drive_t *);
 751
 752 static ide_driver_t idefloppy_driver = {
 753         .gen_driver = {
 754                 .owner          = THIS_MODULE,
 755                 .name           = "ide-floppy",
 756                 .bus            = &ide_bus_type,
 757         },
 758         .probe                  = ide_floppy_probe,
 759         .remove                 = ide_floppy_remove,
 760         .version                = IDEFLOPPY_VERSION,
 761         .media                  = ide_floppy,
 762         .do_request             = idefloppy_do_request,
 763         .end_request            = idefloppy_end_request,
 764         .error                  = __ide_error,
 765 #ifdef CONFIG_IDE_PROC_FS
 766         .proc                   = idefloppy_proc,
 767         .settings               = idefloppy_settings,
 768 #endif
 769 };
 770
 771 static int idefloppy_open(struct inode *inode, struct file *filp)
 772 {
 773         struct gendisk *disk = inode->i_bdev->bd_disk;
 774         struct ide_floppy_obj *floppy;
 775         ide_drive_t *drive;
 776         struct ide_atapi_pc pc;
 777         int ret = 0;
 778
 779         debug_log("Reached %s\n", __func__);
 780
 781         floppy = ide_floppy_get(disk);
 782         if (!floppy)
 783                 return -ENXIO;
 784
 785         drive = floppy->drive;
 786
 787         floppy->openers++;
 788
 789         if (floppy->openers == 1) {
 790                 drive->atapi_flags &= ~IDE_AFLAG_FORMAT_IN_PROGRESS;
 791                 /* Just in case */
 792
 793                 ide_init_pc(&pc);
 794                 pc.c[0] = GPCMD_TEST_UNIT_READY;
 795
 796                 if (ide_queue_pc_tail(drive, disk, &pc))
 797                         ide_do_start_stop(drive, disk, 1);
 798
 799                 if (ide_floppy_get_capacity(drive)
 800                    && (filp->f_flags & O_NDELAY) == 0
 801                     /*
 802                      * Allow O_NDELAY to open a drive without a disk, or with an
 803                      * unreadable disk, so that we can get the format capacity
 804                      * of the drive or begin the format - Sam
 805                      */
 806                     ) {
 807                         ret = -EIO;
 808                         goto out_put_floppy;
 809                 }
 810
 811                 if ((drive->atapi_flags & IDE_AFLAG_WP) && (filp->f_mode & 2)) {
 812                         ret = -EROFS;
 813                         goto out_put_floppy;
 814                 }
 815
 816                 drive->atapi_flags |= IDE_AFLAG_MEDIA_CHANGED;
 817                 ide_set_media_lock(drive, disk, 1);
 818                 check_disk_change(inode->i_bdev);
 819         } else if (drive->atapi_flags & IDE_AFLAG_FORMAT_IN_PROGRESS) {
 820                 ret = -EBUSY;
 821                 goto out_put_floppy;
 822         }
 823         return 0;
 824
 825 out_put_floppy:
 826         floppy->openers--;
 827         ide_floppy_put(floppy);
 828         return ret;
 829 }
 830
 831 static int idefloppy_release(struct inode *inode, struct file *filp)
 832 {
 833         struct gendisk *disk = inode->i_bdev->bd_disk;
 834         struct ide_floppy_obj *floppy = ide_floppy_g(disk);
 835         ide_drive_t *drive = floppy->drive;
 836
 837         debug_log("Reached %s\n", __func__);
 838
 839         if (floppy->openers == 1) {
 840                 ide_set_media_lock(drive, disk, 0);
 841                 drive->atapi_flags &= ~IDE_AFLAG_FORMAT_IN_PROGRESS;
 842         }
 843
 844         floppy->openers--;
 845
 846         ide_floppy_put(floppy);
 847
 848         return 0;
 849 }
 850
 851 static int idefloppy_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 852 {
 853         struct ide_floppy_obj *floppy = ide_floppy_g(bdev->bd_disk);
 854         ide_drive_t *drive = floppy->drive;
 855
 856         geo->heads = drive->bios_head;
 857         geo->sectors = drive->bios_sect;
 858         geo->cylinders = (u16)drive->bios_cyl; /* truncate */
 859         return 0;
 860 }
 861
 862 static int ide_floppy_lockdoor(ide_drive_t *drive, struct ide_atapi_pc *pc,
 863                                unsigned long arg, unsigned int cmd)
 864 {
 865         idefloppy_floppy_t *floppy = drive->driver_data;
 866         struct gendisk *disk = floppy->disk;
 867         int prevent = (arg && cmd != CDROMEJECT) ? 1 : 0;
 868
 869         if (floppy->openers > 1)
 870                 return -EBUSY;
 871
 872         ide_set_media_lock(drive, disk, prevent);
 873
 874         if (cmd == CDROMEJECT)
 875                 ide_do_start_stop(drive, disk, 2);
 876
 877         return 0;
 878 }
 879
 880 static int idefloppy_ioctl(struct inode *inode, struct file *file,
 881                         unsigned int cmd, unsigned long arg)
 882 {
 883         struct block_device *bdev = inode->i_bdev;
 884         struct ide_floppy_obj *floppy = ide_floppy_g(bdev->bd_disk);
 885         ide_drive_t *drive = floppy->drive;
 886         struct ide_atapi_pc pc;
 887         void __user *argp = (void __user *)arg;
 888         int err;
 889
 890         if (cmd == CDROMEJECT || cmd == CDROM_LOCKDOOR)
 891                 return ide_floppy_lockdoor(drive, &pc, arg, cmd);
 892
 893         err = ide_floppy_format_ioctl(drive, file, cmd, argp);
 894         if (err != -ENOTTY)
 895                 return err;
 896
 897         /*
 898          * skip SCSI_IOCTL_SEND_COMMAND (deprecated)
 899          * and CDROM_SEND_PACKET (legacy) ioctls
 900          */
 901         if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND)
 902                 err = scsi_cmd_ioctl(file, bdev->bd_disk->queue,
 903                                         bdev->bd_disk, cmd, argp);
 904
 905         if (err == -ENOTTY)
 906                 err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
 907
 908         return err;
 909 }
 910
 911 static int idefloppy_media_changed(struct gendisk *disk)
 912 {
 913         struct ide_floppy_obj *floppy = ide_floppy_g(disk);
 914         ide_drive_t *drive = floppy->drive;
 915         int ret;
 916
 917         /* do not scan partitions twice if this is a removable device */
 918         if (drive->attach) {
 919                 drive->attach = 0;
 920                 return 0;
 921         }
 922         ret = !!(drive->atapi_flags & IDE_AFLAG_MEDIA_CHANGED);
 923         drive->atapi_flags &= ~IDE_AFLAG_MEDIA_CHANGED;
 924         return ret;
 925 }
 926
 927 static int idefloppy_revalidate_disk(struct gendisk *disk)
 928 {
 929         struct ide_floppy_obj *floppy = ide_floppy_g(disk);
 930         set_capacity(disk, idefloppy_capacity(floppy->drive));
 931         return 0;
 932 }
 933
 934 static struct block_device_operations idefloppy_ops = {
 935         .owner                  = THIS_MODULE,
 936         .open                   = idefloppy_open,
 937         .release                = idefloppy_release,
 938         .ioctl                  = idefloppy_ioctl,
 939         .getgeo                 = idefloppy_getgeo,
 940         .media_changed          = idefloppy_media_changed,
 941         .revalidate_disk        = idefloppy_revalidate_disk
 942 };
 943
 944 static int ide_floppy_probe(ide_drive_t *drive)
 945 {
 946         idefloppy_floppy_t *floppy;
 947         struct gendisk *g;
 948
 949         if (!strstr("ide-floppy", drive->driver_req))
 950                 goto failed;
 951
 952         if (drive->media != ide_floppy)
 953                 goto failed;
 954
 955         if (!ide_check_atapi_device(drive, DRV_NAME)) {
 956                 printk(KERN_ERR "ide-floppy: %s: not supported by this version"
 957                                 " of ide-floppy\n", drive->name);
 958                 goto failed;
 959         }
 960         floppy = kzalloc(sizeof(idefloppy_floppy_t), GFP_KERNEL);
 961         if (!floppy) {
 962                 printk(KERN_ERR "ide-floppy: %s: Can't allocate a floppy"
 963                                 " structure\n", drive->name);
 964                 goto failed;
 965         }
 966
 967         g = alloc_disk(1 << PARTN_BITS);
 968         if (!g)
 969                 goto out_free_floppy;
 970
 971         ide_init_disk(g, drive);
 972
 973         kref_init(&floppy->kref);
 974
 975         floppy->drive = drive;
 976         floppy->driver = &idefloppy_driver;
 977         floppy->disk = g;
 978
 979         g->private_data = &floppy->driver;
 980
 981         drive->driver_data = floppy;
 982
 983         idefloppy_setup(drive, floppy);
 984
 985         g->minors = 1 << PARTN_BITS;
 986         g->driverfs_dev = &drive->gendev;
 987         g->flags = drive->removable ? GENHD_FL_REMOVABLE : 0;
 988         g->fops = &idefloppy_ops;
 989         drive->attach = 1;
 990         add_disk(g);
 991         return 0;
 992
 993 out_free_floppy:
 994         kfree(floppy);
 995 failed:
 996         return -ENODEV;
 997 }
 998
 999 static void __exit idefloppy_exit(void)
1000 {
1001         driver_unregister(&idefloppy_driver.gen_driver);
1002 }
1003
1004 static int __init idefloppy_init(void)
1005 {
1006         printk("ide-floppy driver " IDEFLOPPY_VERSION "\n");
1007         return driver_register(&idefloppy_driver.gen_driver);
1008 }
1009
1010 MODULE_ALIAS("ide:*m-floppy*");
1011 MODULE_ALIAS("ide-floppy");
1012 module_init(idefloppy_init);
1013 module_exit(idefloppy_exit);
1014 MODULE_LICENSE("GPL");
1015 MODULE_DESCRIPTION("ATAPI FLOPPY Driver");
1016