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