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