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