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 IDEFLOPPY_VERSION "1.00"
  19
  20 #include <linux/module.h>
  21 #include <linux/types.h>
  22 #include <linux/string.h>
  23 #include <linux/kernel.h>
  24 #include <linux/delay.h>
  25 #include <linux/timer.h>
  26 #include <linux/mm.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/major.h>
  29 #include <linux/errno.h>
  30 #include <linux/genhd.h>
  31 #include <linux/slab.h>
  32 #include <linux/cdrom.h>
  33 #include <linux/ide.h>
  34 #include <linux/bitops.h>
  35 #include <linux/mutex.h>
  36
  37 #include <scsi/scsi_ioctl.h>
  38
  39 #include <asm/byteorder.h>
  40 #include <linux/irq.h>
  41 #include <linux/uaccess.h>
  42 #include <linux/io.h>
  43 #include <asm/unaligned.h>
  44
  45 /* define to see debug info */
  46 #define IDEFLOPPY_DEBUG_LOG             0
  47
  48 /* #define IDEFLOPPY_DEBUG(fmt, args...) printk(KERN_INFO fmt, ## args) */
  49 #define IDEFLOPPY_DEBUG(fmt, args...)
  50
  51 #if IDEFLOPPY_DEBUG_LOG
  52 #define debug_log(fmt, args...) \
  53         printk(KERN_INFO "ide-floppy: " fmt, ## args)
  54 #else
  55 #define debug_log(fmt, args...) do {} while (0)
  56 #endif
  57
  58
  59 /* Some drives require a longer irq timeout. */
  60 #define IDEFLOPPY_WAIT_CMD              (5 * WAIT_CMD)
  61
  62 /*
  63  * After each failed packet command we issue a request sense command and retry
  64  * the packet command IDEFLOPPY_MAX_PC_RETRIES times.
  65  */
  66 #define IDEFLOPPY_MAX_PC_RETRIES        3
  67
  68 /*
  69  * With each packet command, we allocate a buffer of IDEFLOPPY_PC_BUFFER_SIZE
  70  * bytes.
  71  */
  72 #define IDEFLOPPY_PC_BUFFER_SIZE        256
  73
  74 /*
  75  * In various places in the driver, we need to allocate storage for packet
  76  * commands and requests, which will remain valid while we leave the driver to
  77  * wait for an interrupt or a timeout event.
  78  */
  79 #define IDEFLOPPY_PC_STACK              (10 + IDEFLOPPY_MAX_PC_RETRIES)
  80
  81 /* format capacities descriptor codes */
  82 #define CAPACITY_INVALID        0x00
  83 #define CAPACITY_UNFORMATTED    0x01
  84 #define CAPACITY_CURRENT        0x02
  85 #define CAPACITY_NO_CARTRIDGE   0x03
  86
  87 /*
  88  * Most of our global data which we need to save even as we leave the driver
  89  * due to an interrupt or a timer event is stored in a variable of type
  90  * idefloppy_floppy_t, defined below.
  91  */
  92 typedef struct ide_floppy_obj {
  93         ide_drive_t     *drive;
  94         ide_driver_t    *driver;
  95         struct gendisk  *disk;
  96         struct kref     kref;
  97         unsigned int    openers;        /* protected by BKL for now */
  98
  99         /* Current packet command */
 100         struct ide_atapi_pc *pc;
 101         /* Last failed packet command */
 102         struct ide_atapi_pc *failed_pc;
 103         /* Packet command stack */
 104         struct ide_atapi_pc pc_stack[IDEFLOPPY_PC_STACK];
 105         /* Next free packet command storage space */
 106         int pc_stack_index;
 107         struct request rq_stack[IDEFLOPPY_PC_STACK];
 108         /* We implement a circular array */
 109         int rq_stack_index;
 110
 111         /* Last error information */
 112         u8 sense_key, asc, ascq;
 113         /* delay this long before sending packet command */
 114         u8 ticks;
 115         int progress_indication;
 116
 117         /* Device information */
 118         /* Current format */
 119         int blocks, block_size, bs_factor;
 120         /* Last format capacity descriptor */
 121         u8 cap_desc[8];
 122         /* Copy of the flexible disk page */
 123         u8 flexible_disk_page[32];
 124         /* Write protect */
 125         int wp;
 126         /* Supports format progress report */
 127         int srfp;
 128         /* Status/Action flags */
 129         unsigned long flags;
 130 } idefloppy_floppy_t;
 131
 132 #define IDEFLOPPY_TICKS_DELAY   HZ/20   /* default delay for ZIP 100 (50ms) */
 133
 134 /* Floppy flag bits values. */
 135 enum {
 136         /* DRQ interrupt device */
 137         IDEFLOPPY_FLAG_DRQ_INTERRUPT            = (1 << 0),
 138         /* Media may have changed */
 139         IDEFLOPPY_FLAG_MEDIA_CHANGED            = (1 << 1),
 140         /* Format in progress */
 141         IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS       = (1 << 2),
 142         /* Avoid commands not supported in Clik drive */
 143         IDEFLOPPY_FLAG_CLIK_DRIVE               = (1 << 3),
 144         /* Requires BH algorithm for packets */
 145         IDEFLOPPY_FLAG_ZIP_DRIVE                = (1 << 4),
 146 };
 147
 148 /* Defines for the MODE SENSE command */
 149 #define MODE_SENSE_CURRENT              0x00
 150 #define MODE_SENSE_CHANGEABLE           0x01
 151 #define MODE_SENSE_DEFAULT              0x02
 152 #define MODE_SENSE_SAVED                0x03
 153
 154 /* IOCTLs used in low-level formatting. */
 155 #define IDEFLOPPY_IOCTL_FORMAT_SUPPORTED        0x4600
 156 #define IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY     0x4601
 157 #define IDEFLOPPY_IOCTL_FORMAT_START            0x4602
 158 #define IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS     0x4603
 159
 160 /* Error code returned in rq->errors to the higher part of the driver. */
 161 #define IDEFLOPPY_ERROR_GENERAL         101
 162
 163 /*
 164  * Pages of the SELECT SENSE / MODE SENSE packet commands.
 165  * See SFF-8070i spec.
 166  */
 167 #define IDEFLOPPY_CAPABILITIES_PAGE     0x1b
 168 #define IDEFLOPPY_FLEXIBLE_DISK_PAGE    0x05
 169
 170 static DEFINE_MUTEX(idefloppy_ref_mutex);
 171
 172 #define to_ide_floppy(obj) container_of(obj, struct ide_floppy_obj, kref)
 173
 174 #define ide_floppy_g(disk) \
 175         container_of((disk)->private_data, struct ide_floppy_obj, driver)
 176
 177 static struct ide_floppy_obj *ide_floppy_get(struct gendisk *disk)
 178 {
 179         struct ide_floppy_obj *floppy = NULL;
 180
 181         mutex_lock(&idefloppy_ref_mutex);
 182         floppy = ide_floppy_g(disk);
 183         if (floppy)
 184                 kref_get(&floppy->kref);
 185         mutex_unlock(&idefloppy_ref_mutex);
 186         return floppy;
 187 }
 188
 189 static void idefloppy_cleanup_obj(struct kref *);
 190
 191 static void ide_floppy_put(struct ide_floppy_obj *floppy)
 192 {
 193         mutex_lock(&idefloppy_ref_mutex);
 194         kref_put(&floppy->kref, idefloppy_cleanup_obj);
 195         mutex_unlock(&idefloppy_ref_mutex);
 196 }
 197
 198 /*
 199  * Used to finish servicing a request. For read/write requests, we will call
 200  * ide_end_request to pass to the next buffer.
 201  */
 202 static int idefloppy_end_request(ide_drive_t *drive, int uptodate, int nsecs)
 203 {
 204         idefloppy_floppy_t *floppy = drive->driver_data;
 205         struct request *rq = HWGROUP(drive)->rq;
 206         int error;
 207
 208         debug_log("Reached %s\n", __func__);
 209
 210         switch (uptodate) {
 211         case 0: error = IDEFLOPPY_ERROR_GENERAL; break;
 212         case 1: error = 0; break;
 213         default: error = uptodate;
 214         }
 215         if (error)
 216                 floppy->failed_pc = NULL;
 217         /* Why does this happen? */
 218         if (!rq)
 219                 return 0;
 220         if (!blk_special_request(rq)) {
 221                 /* our real local end request function */
 222                 ide_end_request(drive, uptodate, nsecs);
 223                 return 0;
 224         }
 225         rq->errors = error;
 226         /* fixme: need to move this local also */
 227         ide_end_drive_cmd(drive, 0, 0);
 228         return 0;
 229 }
 230
 231 static void ide_floppy_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
 232                                   unsigned int bcount, int direction)
 233 {
 234         ide_hwif_t *hwif = drive->hwif;
 235         struct request *rq = pc->rq;
 236         struct req_iterator iter;
 237         struct bio_vec *bvec;
 238         unsigned long flags;
 239         int count, done = 0;
 240         char *data;
 241
 242         rq_for_each_segment(bvec, rq, iter) {
 243                 if (!bcount)
 244                         break;
 245
 246                 count = min(bvec->bv_len, bcount);
 247
 248                 data = bvec_kmap_irq(bvec, &flags);
 249                 if (direction)
 250                         hwif->tp_ops->output_data(drive, NULL, data, count);
 251                 else
 252                         hwif->tp_ops->input_data(drive, NULL, data, count);
 253                 bvec_kunmap_irq(data, &flags);
 254
 255                 bcount -= count;
 256                 pc->b_count += count;
 257                 done += count;
 258         }
 259
 260         idefloppy_end_request(drive, 1, done >> 9);
 261
 262         if (bcount) {
 263                 printk(KERN_ERR "%s: leftover data in %s, bcount == %d\n",
 264                                 drive->name, __func__, bcount);
 265                 ide_pad_transfer(drive, direction, bcount);
 266         }
 267 }
 268
 269 static void idefloppy_update_buffers(ide_drive_t *drive,
 270                                 struct ide_atapi_pc *pc)
 271 {
 272         struct request *rq = pc->rq;
 273         struct bio *bio = rq->bio;
 274
 275         while ((bio = rq->bio) != NULL)
 276                 idefloppy_end_request(drive, 1, 0);
 277 }
 278
 279 /*
 280  * Generate a new packet command request in front of the request queue, before
 281  * the current request so that it will be processed immediately, on the next
 282  * pass through the driver.
 283  */
 284 static void idefloppy_queue_pc_head(ide_drive_t *drive, struct ide_atapi_pc *pc,
 285                 struct request *rq)
 286 {
 287         struct ide_floppy_obj *floppy = drive->driver_data;
 288
 289         blk_rq_init(NULL, rq);
 290         rq->buffer = (char *) pc;
 291         rq->cmd_type = REQ_TYPE_SPECIAL;
 292         rq->cmd_flags |= REQ_PREEMPT;
 293         rq->rq_disk = floppy->disk;
 294         ide_do_drive_cmd(drive, rq);
 295 }
 296
 297 static struct ide_atapi_pc *idefloppy_next_pc_storage(ide_drive_t *drive)
 298 {
 299         idefloppy_floppy_t *floppy = drive->driver_data;
 300
 301         if (floppy->pc_stack_index == IDEFLOPPY_PC_STACK)
 302                 floppy->pc_stack_index = 0;
 303         return (&floppy->pc_stack[floppy->pc_stack_index++]);
 304 }
 305
 306 static struct request *idefloppy_next_rq_storage(ide_drive_t *drive)
 307 {
 308         idefloppy_floppy_t *floppy = drive->driver_data;
 309
 310         if (floppy->rq_stack_index == IDEFLOPPY_PC_STACK)
 311                 floppy->rq_stack_index = 0;
 312         return (&floppy->rq_stack[floppy->rq_stack_index++]);
 313 }
 314
 315 static void ide_floppy_callback(ide_drive_t *drive)
 316 {
 317         idefloppy_floppy_t *floppy = drive->driver_data;
 318         struct ide_atapi_pc *pc = floppy->pc;
 319         int uptodate = pc->error ? 0 : 1;
 320
 321         debug_log("Reached %s\n", __func__);
 322
 323         if (floppy->failed_pc == pc)
 324                 floppy->failed_pc = NULL;
 325
 326         if (pc->c[0] == GPCMD_READ_10 || pc->c[0] == GPCMD_WRITE_10 ||
 327             (pc->rq && blk_pc_request(pc->rq)))
 328                 uptodate = 1; /* FIXME */
 329         else if (pc->c[0] == GPCMD_REQUEST_SENSE) {
 330                 u8 *buf = floppy->pc->buf;
 331
 332                 if (!pc->error) {
 333                         floppy->sense_key = buf[2] & 0x0F;
 334                         floppy->asc = buf[12];
 335                         floppy->ascq = buf[13];
 336                         floppy->progress_indication = buf[15] & 0x80 ?
 337                                 (u16)get_unaligned((u16 *)&buf[16]) : 0x10000;
 338
 339                         if (floppy->failed_pc)
 340                                 debug_log("pc = %x, ", floppy->failed_pc->c[0]);
 341
 342                         debug_log("sense key = %x, asc = %x, ascq = %x\n",
 343                                   floppy->sense_key, floppy->asc, floppy->ascq);
 344                 } else
 345                         printk(KERN_ERR "Error in REQUEST SENSE itself - "
 346                                         "Aborting request!\n");
 347         }
 348
 349         idefloppy_end_request(drive, uptodate, 0);
 350 }
 351
 352 static void idefloppy_init_pc(struct ide_atapi_pc *pc)
 353 {
 354         memset(pc, 0, sizeof(*pc));
 355         pc->buf = pc->pc_buf;
 356         pc->buf_size = IDEFLOPPY_PC_BUFFER_SIZE;
 357 }
 358
 359 static void idefloppy_create_request_sense_cmd(struct ide_atapi_pc *pc)
 360 {
 361         idefloppy_init_pc(pc);
 362         pc->c[0] = GPCMD_REQUEST_SENSE;
 363         pc->c[4] = 255;
 364         pc->req_xfer = 18;
 365 }
 366
 367 /*
 368  * Called when an error was detected during the last packet command. We queue a
 369  * request sense packet command in the head of the request list.
 370  */
 371 static void idefloppy_retry_pc(ide_drive_t *drive)
 372 {
 373         struct ide_atapi_pc *pc;
 374         struct request *rq;
 375
 376         (void)ide_read_error(drive);
 377         pc = idefloppy_next_pc_storage(drive);
 378         rq = idefloppy_next_rq_storage(drive);
 379         idefloppy_create_request_sense_cmd(pc);
 380         idefloppy_queue_pc_head(drive, pc, rq);
 381 }
 382
 383 /* The usual interrupt handler called during a packet command. */
 384 static ide_startstop_t idefloppy_pc_intr(ide_drive_t *drive)
 385 {
 386         idefloppy_floppy_t *floppy = drive->driver_data;
 387
 388         return ide_pc_intr(drive, floppy->pc, idefloppy_pc_intr,
 389                            IDEFLOPPY_WAIT_CMD, NULL, idefloppy_update_buffers,
 390                            idefloppy_retry_pc, NULL, ide_floppy_io_buffers);
 391 }
 392
 393 /*
 394  * What we have here is a classic case of a top half / bottom half interrupt
 395  * service routine. In interrupt mode, the device sends an interrupt to signal
 396  * that it is ready to receive a packet. However, we need to delay about 2-3
 397  * ticks before issuing the packet or we gets in trouble.
 398  */
 399 static int idefloppy_transfer_pc(ide_drive_t *drive)
 400 {
 401         idefloppy_floppy_t *floppy = drive->driver_data;
 402
 403         /* Send the actual packet */
 404         drive->hwif->tp_ops->output_data(drive, NULL, floppy->pc->c, 12);
 405
 406         /* Timeout for the packet command */
 407         return IDEFLOPPY_WAIT_CMD;
 408 }
 409
 410
 411 /*
 412  * Called as an interrupt (or directly). When the device says it's ready for a
 413  * packet, we schedule the packet transfer to occur about 2-3 ticks later in
 414  * transfer_pc.
 415  */
 416 static ide_startstop_t idefloppy_start_pc_transfer(ide_drive_t *drive)
 417 {
 418         idefloppy_floppy_t *floppy = drive->driver_data;
 419         struct ide_atapi_pc *pc = floppy->pc;
 420         ide_expiry_t *expiry;
 421         unsigned int timeout;
 422
 423         /*
 424          * The following delay solves a problem with ATAPI Zip 100 drives
 425          * where the Busy flag was apparently being deasserted before the
 426          * unit was ready to receive data. This was happening on a
 427          * 1200 MHz Athlon system. 10/26/01 25msec is too short,
 428          * 40 and 50msec work well. idefloppy_pc_intr will not be actually
 429          * used until after the packet is moved in about 50 msec.
 430          */
 431         if (pc->flags & PC_FLAG_ZIP_DRIVE) {
 432                 timeout = floppy->ticks;
 433                 expiry = &idefloppy_transfer_pc;
 434         } else {
 435                 timeout = IDEFLOPPY_WAIT_CMD;
 436                 expiry = NULL;
 437         }
 438
 439         return ide_transfer_pc(drive, pc, idefloppy_pc_intr, timeout, expiry);
 440 }
 441
 442 static void ide_floppy_report_error(idefloppy_floppy_t *floppy,
 443                                     struct ide_atapi_pc *pc)
 444 {
 445         /* supress error messages resulting from Medium not present */
 446         if (floppy->sense_key == 0x02 &&
 447             floppy->asc       == 0x3a &&
 448             floppy->ascq      == 0x00)
 449                 return;
 450
 451         printk(KERN_ERR "ide-floppy: %s: I/O error, pc = %2x, key = %2x, "
 452                         "asc = %2x, ascq = %2x\n",
 453                         floppy->drive->name, pc->c[0], floppy->sense_key,
 454                         floppy->asc, floppy->ascq);
 455
 456 }
 457
 458 static ide_startstop_t idefloppy_issue_pc(ide_drive_t *drive,
 459                 struct ide_atapi_pc *pc)
 460 {
 461         idefloppy_floppy_t *floppy = drive->driver_data;
 462
 463         if (floppy->failed_pc == NULL &&
 464             pc->c[0] != GPCMD_REQUEST_SENSE)
 465                 floppy->failed_pc = pc;
 466         /* Set the current packet command */
 467         floppy->pc = pc;
 468
 469         if (pc->retries > IDEFLOPPY_MAX_PC_RETRIES) {
 470                 if (!(pc->flags & PC_FLAG_SUPPRESS_ERROR))
 471                         ide_floppy_report_error(floppy, pc);
 472                 /* Giving up */
 473                 pc->error = IDEFLOPPY_ERROR_GENERAL;
 474
 475                 floppy->failed_pc = NULL;
 476                 drive->pc_callback(drive);
 477                 return ide_stopped;
 478         }
 479
 480         debug_log("Retry number - %d\n", pc->retries);
 481
 482         pc->retries++;
 483
 484         return ide_issue_pc(drive, pc, idefloppy_start_pc_transfer,
 485                             IDEFLOPPY_WAIT_CMD, NULL);
 486 }
 487
 488 static void idefloppy_create_prevent_cmd(struct ide_atapi_pc *pc, int prevent)
 489 {
 490         debug_log("creating prevent removal command, prevent = %d\n", prevent);
 491
 492         idefloppy_init_pc(pc);
 493         pc->c[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
 494         pc->c[4] = prevent;
 495 }
 496
 497 static void idefloppy_create_read_capacity_cmd(struct ide_atapi_pc *pc)
 498 {
 499         idefloppy_init_pc(pc);
 500         pc->c[0] = GPCMD_READ_FORMAT_CAPACITIES;
 501         pc->c[7] = 255;
 502         pc->c[8] = 255;
 503         pc->req_xfer = 255;
 504 }
 505
 506 static void idefloppy_create_format_unit_cmd(struct ide_atapi_pc *pc, int b,
 507                 int l, int flags)
 508 {
 509         idefloppy_init_pc(pc);
 510         pc->c[0] = GPCMD_FORMAT_UNIT;
 511         pc->c[1] = 0x17;
 512
 513         memset(pc->buf, 0, 12);
 514         pc->buf[1] = 0xA2;
 515         /* Default format list header, u8 1: FOV/DCRT/IMM bits set */
 516
 517         if (flags & 1)                          /* Verify bit on... */
 518                 pc->buf[1] ^= 0x20;             /* ... turn off DCRT bit */
 519         pc->buf[3] = 8;
 520
 521         put_unaligned(cpu_to_be32(b), (unsigned int *)(&pc->buf[4]));
 522         put_unaligned(cpu_to_be32(l), (unsigned int *)(&pc->buf[8]));
 523         pc->buf_size = 12;
 524         pc->flags |= PC_FLAG_WRITING;
 525 }
 526
 527 /* A mode sense command is used to "sense" floppy parameters. */
 528 static void idefloppy_create_mode_sense_cmd(struct ide_atapi_pc *pc,
 529                 u8 page_code, u8 type)
 530 {
 531         u16 length = 8; /* sizeof(Mode Parameter Header) = 8 Bytes */
 532
 533         idefloppy_init_pc(pc);
 534         pc->c[0] = GPCMD_MODE_SENSE_10;
 535         pc->c[1] = 0;
 536         pc->c[2] = page_code + (type << 6);
 537
 538         switch (page_code) {
 539         case IDEFLOPPY_CAPABILITIES_PAGE:
 540                 length += 12;
 541                 break;
 542         case IDEFLOPPY_FLEXIBLE_DISK_PAGE:
 543                 length += 32;
 544                 break;
 545         default:
 546                 printk(KERN_ERR "ide-floppy: unsupported page code "
 547                                 "in create_mode_sense_cmd\n");
 548         }
 549         put_unaligned(cpu_to_be16(length), (u16 *) &pc->c[7]);
 550         pc->req_xfer = length;
 551 }
 552
 553 static void idefloppy_create_start_stop_cmd(struct ide_atapi_pc *pc, int start)
 554 {
 555         idefloppy_init_pc(pc);
 556         pc->c[0] = GPCMD_START_STOP_UNIT;
 557         pc->c[4] = start;
 558 }
 559
 560 static void idefloppy_create_rw_cmd(idefloppy_floppy_t *floppy,
 561                                     struct ide_atapi_pc *pc, struct request *rq,
 562                                     unsigned long sector)
 563 {
 564         int block = sector / floppy->bs_factor;
 565         int blocks = rq->nr_sectors / floppy->bs_factor;
 566         int cmd = rq_data_dir(rq);
 567
 568         debug_log("create_rw10_cmd: block == %d, blocks == %d\n",
 569                 block, blocks);
 570
 571         idefloppy_init_pc(pc);
 572         pc->c[0] = cmd == READ ? GPCMD_READ_10 : GPCMD_WRITE_10;
 573         put_unaligned(cpu_to_be16(blocks), (unsigned short *)&pc->c[7]);
 574         put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[2]);
 575
 576         pc->rq = rq;
 577         pc->b_count = cmd == READ ? 0 : rq->bio->bi_size;
 578         if (rq->cmd_flags & REQ_RW)
 579                 pc->flags |= PC_FLAG_WRITING;
 580         pc->buf = NULL;
 581         pc->req_xfer = pc->buf_size = blocks * floppy->block_size;
 582         pc->flags |= PC_FLAG_DMA_OK;
 583 }
 584
 585 static void idefloppy_blockpc_cmd(idefloppy_floppy_t *floppy,
 586                 struct ide_atapi_pc *pc, struct request *rq)
 587 {
 588         idefloppy_init_pc(pc);
 589         memcpy(pc->c, rq->cmd, sizeof(pc->c));
 590         pc->rq = rq;
 591         pc->b_count = rq->data_len;
 592         if (rq->data_len && rq_data_dir(rq) == WRITE)
 593                 pc->flags |= PC_FLAG_WRITING;
 594         pc->buf = rq->data;
 595         if (rq->bio)
 596                 pc->flags |= PC_FLAG_DMA_OK;
 597         /*
 598          * possibly problematic, doesn't look like ide-floppy correctly
 599          * handled scattered requests if dma fails...
 600          */
 601         pc->req_xfer = pc->buf_size = rq->data_len;
 602 }
 603
 604 static ide_startstop_t idefloppy_do_request(ide_drive_t *drive,
 605                 struct request *rq, sector_t block_s)
 606 {
 607         idefloppy_floppy_t *floppy = drive->driver_data;
 608         struct ide_atapi_pc *pc;
 609         unsigned long block = (unsigned long)block_s;
 610
 611         debug_log("dev: %s, cmd_type: %x, errors: %d\n",
 612                         rq->rq_disk ? rq->rq_disk->disk_name : "?",
 613                         rq->cmd_type, rq->errors);
 614         debug_log("sector: %ld, nr_sectors: %ld, "
 615                         "current_nr_sectors: %d\n", (long)rq->sector,
 616                         rq->nr_sectors, rq->current_nr_sectors);
 617
 618         if (rq->errors >= ERROR_MAX) {
 619                 if (floppy->failed_pc)
 620                         ide_floppy_report_error(floppy, floppy->failed_pc);
 621                 else
 622                         printk(KERN_ERR "ide-floppy: %s: I/O error\n",
 623                                 drive->name);
 624                 idefloppy_end_request(drive, 0, 0);
 625                 return ide_stopped;
 626         }
 627         if (blk_fs_request(rq)) {
 628                 if (((long)rq->sector % floppy->bs_factor) ||
 629                     (rq->nr_sectors % floppy->bs_factor)) {
 630                         printk(KERN_ERR "%s: unsupported r/w request size\n",
 631                                         drive->name);
 632                         idefloppy_end_request(drive, 0, 0);
 633                         return ide_stopped;
 634                 }
 635                 pc = idefloppy_next_pc_storage(drive);
 636                 idefloppy_create_rw_cmd(floppy, pc, rq, block);
 637         } else if (blk_special_request(rq)) {
 638                 pc = (struct ide_atapi_pc *) rq->buffer;
 639         } else if (blk_pc_request(rq)) {
 640                 pc = idefloppy_next_pc_storage(drive);
 641                 idefloppy_blockpc_cmd(floppy, pc, rq);
 642         } else {
 643                 blk_dump_rq_flags(rq,
 644                         "ide-floppy: unsupported command in queue");
 645                 idefloppy_end_request(drive, 0, 0);
 646                 return ide_stopped;
 647         }
 648
 649         if (floppy->flags & IDEFLOPPY_FLAG_DRQ_INTERRUPT)
 650                 pc->flags |= PC_FLAG_DRQ_INTERRUPT;
 651
 652         if (floppy->flags & IDEFLOPPY_FLAG_ZIP_DRIVE)
 653                 pc->flags |= PC_FLAG_ZIP_DRIVE;
 654
 655         pc->rq = rq;
 656
 657         return idefloppy_issue_pc(drive, pc);
 658 }
 659
 660 /*
 661  * Add a special packet command request to the tail of the request queue,
 662  * and wait for it to be serviced.
 663  */
 664 static int idefloppy_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc)
 665 {
 666         struct ide_floppy_obj *floppy = drive->driver_data;
 667         struct request *rq;
 668         int error;
 669
 670         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 671         rq->buffer = (char *) pc;
 672         rq->cmd_type = REQ_TYPE_SPECIAL;
 673         error = blk_execute_rq(drive->queue, floppy->disk, rq, 0);
 674         blk_put_request(rq);
 675
 676         return error;
 677 }
 678
 679 /*
 680  * Look at the flexible disk page parameters. We ignore the CHS capacity
 681  * parameters and use the LBA parameters instead.
 682  */
 683 static int ide_floppy_get_flexible_disk_page(ide_drive_t *drive)
 684 {
 685         idefloppy_floppy_t *floppy = drive->driver_data;
 686         struct ide_atapi_pc pc;
 687         u8 *page;
 688         int capacity, lba_capacity;
 689         u16 transfer_rate, sector_size, cyls, rpm;
 690         u8 heads, sectors;
 691
 692         idefloppy_create_mode_sense_cmd(&pc, IDEFLOPPY_FLEXIBLE_DISK_PAGE,
 693                                         MODE_SENSE_CURRENT);
 694
 695         if (idefloppy_queue_pc_tail(drive, &pc)) {
 696                 printk(KERN_ERR "ide-floppy: Can't get flexible disk page"
 697                                 " parameters\n");
 698                 return 1;
 699         }
 700         floppy->wp = !!(pc.buf[3] & 0x80);
 701         set_disk_ro(floppy->disk, floppy->wp);
 702         page = &pc.buf[8];
 703
 704         transfer_rate = be16_to_cpup((__be16 *)&pc.buf[8 + 2]);
 705         sector_size   = be16_to_cpup((__be16 *)&pc.buf[8 + 6]);
 706         cyls          = be16_to_cpup((__be16 *)&pc.buf[8 + 8]);
 707         rpm           = be16_to_cpup((__be16 *)&pc.buf[8 + 28]);
 708         heads         = pc.buf[8 + 4];
 709         sectors       = pc.buf[8 + 5];
 710
 711         capacity = cyls * heads * sectors * sector_size;
 712
 713         if (memcmp(page, &floppy->flexible_disk_page, 32))
 714                 printk(KERN_INFO "%s: %dkB, %d/%d/%d CHS, %d kBps, "
 715                                 "%d sector size, %d rpm\n",
 716                                 drive->name, capacity / 1024, cyls, heads,
 717                                 sectors, transfer_rate / 8, sector_size, rpm);
 718
 719         memcpy(&floppy->flexible_disk_page, page, 32);
 720         drive->bios_cyl = cyls;
 721         drive->bios_head = heads;
 722         drive->bios_sect = sectors;
 723         lba_capacity = floppy->blocks * floppy->block_size;
 724
 725         if (capacity < lba_capacity) {
 726                 printk(KERN_NOTICE "%s: The disk reports a capacity of %d "
 727                         "bytes, but the drive only handles %d\n",
 728                         drive->name, lba_capacity, capacity);
 729                 floppy->blocks = floppy->block_size ?
 730                         capacity / floppy->block_size : 0;
 731         }
 732         return 0;
 733 }
 734
 735 static int idefloppy_get_sfrp_bit(ide_drive_t *drive)
 736 {
 737         idefloppy_floppy_t *floppy = drive->driver_data;
 738         struct ide_atapi_pc pc;
 739
 740         floppy->srfp = 0;
 741         idefloppy_create_mode_sense_cmd(&pc, IDEFLOPPY_CAPABILITIES_PAGE,
 742                                                  MODE_SENSE_CURRENT);
 743
 744         pc.flags |= PC_FLAG_SUPPRESS_ERROR;
 745         if (idefloppy_queue_pc_tail(drive, &pc))
 746                 return 1;
 747
 748         floppy->srfp = pc.buf[8 + 2] & 0x40;
 749         return (0);
 750 }
 751
 752 /*
 753  * Determine if a media is present in the floppy drive, and if so, its LBA
 754  * capacity.
 755  */
 756 static int ide_floppy_get_capacity(ide_drive_t *drive)
 757 {
 758         idefloppy_floppy_t *floppy = drive->driver_data;
 759         struct ide_atapi_pc pc;
 760         u8 *cap_desc;
 761         u8 header_len, desc_cnt;
 762         int i, rc = 1, blocks, length;
 763
 764         drive->bios_cyl = 0;
 765         drive->bios_head = drive->bios_sect = 0;
 766         floppy->blocks = 0;
 767         floppy->bs_factor = 1;
 768         set_capacity(floppy->disk, 0);
 769
 770         idefloppy_create_read_capacity_cmd(&pc);
 771         if (idefloppy_queue_pc_tail(drive, &pc)) {
 772                 printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
 773                 return 1;
 774         }
 775         header_len = pc.buf[3];
 776         cap_desc = &pc.buf[4];
 777         desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */
 778
 779         for (i = 0; i < desc_cnt; i++) {
 780                 unsigned int desc_start = 4 + i*8;
 781
 782                 blocks = be32_to_cpup((__be32 *)&pc.buf[desc_start]);
 783                 length = be16_to_cpup((__be16 *)&pc.buf[desc_start + 6]);
 784
 785                 debug_log("Descriptor %d: %dkB, %d blocks, %d sector size\n",
 786                                 i, blocks * length / 1024, blocks, length);
 787
 788                 if (i)
 789                         continue;
 790                 /*
 791                  * the code below is valid only for the 1st descriptor, ie i=0
 792                  */
 793
 794                 switch (pc.buf[desc_start + 4] & 0x03) {
 795                 /* Clik! drive returns this instead of CAPACITY_CURRENT */
 796                 case CAPACITY_UNFORMATTED:
 797                         if (!(floppy->flags & IDEFLOPPY_FLAG_CLIK_DRIVE))
 798                                 /*
 799                                  * If it is not a clik drive, break out
 800                                  * (maintains previous driver behaviour)
 801                                  */
 802                                 break;
 803                 case CAPACITY_CURRENT:
 804                         /* Normal Zip/LS-120 disks */
 805                         if (memcmp(cap_desc, &floppy->cap_desc, 8))
 806                                 printk(KERN_INFO "%s: %dkB, %d blocks, %d "
 807                                         "sector size\n", drive->name,
 808                                         blocks * length / 1024, blocks, length);
 809                         memcpy(&floppy->cap_desc, cap_desc, 8);
 810
 811                         if (!length || length % 512) {
 812                                 printk(KERN_NOTICE "%s: %d bytes block size "
 813                                         "not supported\n", drive->name, length);
 814                         } else {
 815                                 floppy->blocks = blocks;
 816                                 floppy->block_size = length;
 817                                 floppy->bs_factor = length / 512;
 818                                 if (floppy->bs_factor != 1)
 819                                         printk(KERN_NOTICE "%s: warning: non "
 820                                                 "512 bytes block size not "
 821                                                 "fully supported\n",
 822                                                 drive->name);
 823                                 rc = 0;
 824                         }
 825                         break;
 826                 case CAPACITY_NO_CARTRIDGE:
 827                         /*
 828                          * This is a KERN_ERR so it appears on screen
 829                          * for the user to see
 830                          */
 831                         printk(KERN_ERR "%s: No disk in drive\n", drive->name);
 832                         break;
 833                 case CAPACITY_INVALID:
 834                         printk(KERN_ERR "%s: Invalid capacity for disk "
 835                                 "in drive\n", drive->name);
 836                         break;
 837                 }
 838                 debug_log("Descriptor 0 Code: %d\n",
 839                           pc.buf[desc_start + 4] & 0x03);
 840         }
 841
 842         /* Clik! disk does not support get_flexible_disk_page */
 843         if (!(floppy->flags & IDEFLOPPY_FLAG_CLIK_DRIVE))
 844                 (void) ide_floppy_get_flexible_disk_page(drive);
 845
 846         set_capacity(floppy->disk, floppy->blocks * floppy->bs_factor);
 847         return rc;
 848 }
 849
 850 /*
 851  * Obtain the list of formattable capacities.
 852  * Very similar to ide_floppy_get_capacity, except that we push the capacity
 853  * descriptors to userland, instead of our own structures.
 854  *
 855  * Userland gives us the following structure:
 856  *
 857  * struct idefloppy_format_capacities {
 858  *      int nformats;
 859  *      struct {
 860  *              int nblocks;
 861  *              int blocksize;
 862  *      } formats[];
 863  * };
 864  *
 865  * userland initializes nformats to the number of allocated formats[] records.
 866  * On exit we set nformats to the number of records we've actually initialized.
 867  */
 868
 869 static int ide_floppy_get_format_capacities(ide_drive_t *drive, int __user *arg)
 870 {
 871         struct ide_atapi_pc pc;
 872         u8 header_len, desc_cnt;
 873         int i, blocks, length, u_array_size, u_index;
 874         int __user *argp;
 875
 876         if (get_user(u_array_size, arg))
 877                 return (-EFAULT);
 878
 879         if (u_array_size <= 0)
 880                 return (-EINVAL);
 881
 882         idefloppy_create_read_capacity_cmd(&pc);
 883         if (idefloppy_queue_pc_tail(drive, &pc)) {
 884                 printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
 885                 return (-EIO);
 886         }
 887         header_len = pc.buf[3];
 888         desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */
 889
 890         u_index = 0;
 891         argp = arg + 1;
 892
 893         /*
 894          * We always skip the first capacity descriptor.  That's the current
 895          * capacity.  We are interested in the remaining descriptors, the
 896          * formattable capacities.
 897          */
 898         for (i = 1; i < desc_cnt; i++) {
 899                 unsigned int desc_start = 4 + i*8;
 900
 901                 if (u_index >= u_array_size)
 902                         break;  /* User-supplied buffer too small */
 903
 904                 blocks = be32_to_cpup((__be32 *)&pc.buf[desc_start]);
 905                 length = be16_to_cpup((__be16 *)&pc.buf[desc_start + 6]);
 906
 907                 if (put_user(blocks, argp))
 908                         return(-EFAULT);
 909                 ++argp;
 910
 911                 if (put_user(length, argp))
 912                         return (-EFAULT);
 913                 ++argp;
 914
 915                 ++u_index;
 916         }
 917
 918         if (put_user(u_index, arg))
 919                 return (-EFAULT);
 920         return (0);
 921 }
 922
 923 /*
 924  * Get ATAPI_FORMAT_UNIT progress indication.
 925  *
 926  * Userland gives a pointer to an int.  The int is set to a progress
 927  * indicator 0-65536, with 65536=100%.
 928  *
 929  * If the drive does not support format progress indication, we just check
 930  * the dsc bit, and return either 0 or 65536.
 931  */
 932
 933 static int idefloppy_get_format_progress(ide_drive_t *drive, int __user *arg)
 934 {
 935         idefloppy_floppy_t *floppy = drive->driver_data;
 936         struct ide_atapi_pc pc;
 937         int progress_indication = 0x10000;
 938
 939         if (floppy->srfp) {
 940                 idefloppy_create_request_sense_cmd(&pc);
 941                 if (idefloppy_queue_pc_tail(drive, &pc))
 942                         return (-EIO);
 943
 944                 if (floppy->sense_key == 2 &&
 945                     floppy->asc == 4 &&
 946                     floppy->ascq == 4)
 947                         progress_indication = floppy->progress_indication;
 948
 949                 /* Else assume format_unit has finished, and we're at 0x10000 */
 950         } else {
 951                 ide_hwif_t *hwif = drive->hwif;
 952                 unsigned long flags;
 953                 u8 stat;
 954
 955                 local_irq_save(flags);
 956                 stat = hwif->tp_ops->read_status(hwif);
 957                 local_irq_restore(flags);
 958
 959                 progress_indication = ((stat & SEEK_STAT) == 0) ? 0 : 0x10000;
 960         }
 961         if (put_user(progress_indication, arg))
 962                 return (-EFAULT);
 963
 964         return (0);
 965 }
 966
 967 static sector_t idefloppy_capacity(ide_drive_t *drive)
 968 {
 969         idefloppy_floppy_t *floppy = drive->driver_data;
 970         unsigned long capacity = floppy->blocks * floppy->bs_factor;
 971
 972         return capacity;
 973 }
 974
 975 /*
 976  * Check whether we can support a drive, based on the ATAPI IDENTIFY command
 977  * results.
 978  */
 979 static int idefloppy_identify_device(ide_drive_t *drive, struct hd_driveid *id)
 980 {
 981         u8 gcw[2];
 982         u8 device_type, protocol, removable, drq_type, packet_size;
 983
 984         *((u16 *) &gcw) = id->config;
 985
 986         device_type =  gcw[1] & 0x1F;
 987         removable   = (gcw[0] & 0x80) >> 7;
 988         protocol    = (gcw[1] & 0xC0) >> 6;
 989         drq_type    = (gcw[0] & 0x60) >> 5;
 990         packet_size =  gcw[0] & 0x03;
 991
 992 #ifdef CONFIG_PPC
 993         /* kludge for Apple PowerBook internal zip */
 994         if (device_type == 5 &&
 995             !strstr(id->model, "CD-ROM") && strstr(id->model, "ZIP"))
 996                 device_type = 0;
 997 #endif
 998
 999         if (protocol != 2)
1000                 printk(KERN_ERR "ide-floppy: Protocol (0x%02x) is not ATAPI\n",
1001                         protocol);
1002         else if (device_type != 0)
1003                 printk(KERN_ERR "ide-floppy: Device type (0x%02x) is not set "
1004                                 "to floppy\n", device_type);
1005         else if (!removable)
1006                 printk(KERN_ERR "ide-floppy: The removable flag is not set\n");
1007         else if (drq_type == 3)
1008                 printk(KERN_ERR "ide-floppy: Sorry, DRQ type (0x%02x) not "
1009                                 "supported\n", drq_type);
1010         else if (packet_size != 0)
1011                 printk(KERN_ERR "ide-floppy: Packet size (0x%02x) is not 12 "
1012                                 "bytes\n", packet_size);
1013         else
1014                 return 1;
1015         return 0;
1016 }
1017
1018 #ifdef CONFIG_IDE_PROC_FS
1019 static void idefloppy_add_settings(ide_drive_t *drive)
1020 {
1021         idefloppy_floppy_t *floppy = drive->driver_data;
1022
1023         ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1,
1024                         &drive->bios_cyl, NULL);
1025         ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1,
1026                         &drive->bios_head, NULL);
1027         ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0,  63, 1, 1,
1028                         &drive->bios_sect, NULL);
1029         ide_add_setting(drive, "ticks",    SETTING_RW, TYPE_BYTE, 0, 255, 1, 1,
1030                         &floppy->ticks,  NULL);
1031 }
1032 #else
1033 static inline void idefloppy_add_settings(ide_drive_t *drive) { ; }
1034 #endif
1035
1036 static void idefloppy_setup(ide_drive_t *drive, idefloppy_floppy_t *floppy)
1037 {
1038         u8 gcw[2];
1039
1040         *((u16 *) &gcw) = drive->id->config;
1041         floppy->pc = floppy->pc_stack;
1042         drive->pc_callback = ide_floppy_callback;
1043
1044         if (((gcw[0] & 0x60) >> 5) == 1)
1045                 floppy->flags |= IDEFLOPPY_FLAG_DRQ_INTERRUPT;
1046         /*
1047          * We used to check revisions here. At this point however I'm giving up.
1048          * Just assume they are all broken, its easier.
1049          *
1050          * The actual reason for the workarounds was likely a driver bug after
1051          * all rather than a firmware bug, and the workaround below used to hide
1052          * it. It should be fixed as of version 1.9, but to be on the safe side
1053          * we'll leave the limitation below for the 2.2.x tree.
1054          */
1055         if (!strncmp(drive->id->model, "IOMEGA ZIP 100 ATAPI", 20)) {
1056                 floppy->flags |= IDEFLOPPY_FLAG_ZIP_DRIVE;
1057                 /* This value will be visible in the /proc/ide/hdx/settings */
1058                 floppy->ticks = IDEFLOPPY_TICKS_DELAY;
1059                 blk_queue_max_sectors(drive->queue, 64);
1060         }
1061
1062         /*
1063          * Guess what? The IOMEGA Clik! drive also needs the above fix. It makes
1064          * nasty clicking noises without it, so please don't remove this.
1065          */
1066         if (strncmp(drive->id->model, "IOMEGA Clik!", 11) == 0) {
1067                 blk_queue_max_sectors(drive->queue, 64);
1068                 floppy->flags |= IDEFLOPPY_FLAG_CLIK_DRIVE;
1069         }
1070
1071         (void) ide_floppy_get_capacity(drive);
1072         idefloppy_add_settings(drive);
1073 }
1074
1075 static void ide_floppy_remove(ide_drive_t *drive)
1076 {
1077         idefloppy_floppy_t *floppy = drive->driver_data;
1078         struct gendisk *g = floppy->disk;
1079
1080         ide_proc_unregister_driver(drive, floppy->driver);
1081
1082         del_gendisk(g);
1083
1084         ide_floppy_put(floppy);
1085 }
1086
1087 static void idefloppy_cleanup_obj(struct kref *kref)
1088 {
1089         struct ide_floppy_obj *floppy = to_ide_floppy(kref);
1090         ide_drive_t *drive = floppy->drive;
1091         struct gendisk *g = floppy->disk;
1092
1093         drive->driver_data = NULL;
1094         g->private_data = NULL;
1095         put_disk(g);
1096         kfree(floppy);
1097 }
1098
1099 #ifdef CONFIG_IDE_PROC_FS
1100 static int proc_idefloppy_read_capacity(char *page, char **start, off_t off,
1101                 int count, int *eof, void *data)
1102 {
1103         ide_drive_t*drive = (ide_drive_t *)data;
1104         int len;
1105
1106         len = sprintf(page, "%llu\n", (long long)idefloppy_capacity(drive));
1107         PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
1108 }
1109
1110 static ide_proc_entry_t idefloppy_proc[] = {
1111         { "capacity",   S_IFREG|S_IRUGO, proc_idefloppy_read_capacity,  NULL },
1112         { "geometry",   S_IFREG|S_IRUGO, proc_ide_read_geometry,        NULL },
1113         { NULL, 0, NULL, NULL }
1114 };
1115 #endif  /* CONFIG_IDE_PROC_FS */
1116
1117 static int ide_floppy_probe(ide_drive_t *);
1118
1119 static ide_driver_t idefloppy_driver = {
1120         .gen_driver = {
1121                 .owner          = THIS_MODULE,
1122                 .name           = "ide-floppy",
1123                 .bus            = &ide_bus_type,
1124         },
1125         .probe                  = ide_floppy_probe,
1126         .remove                 = ide_floppy_remove,
1127         .version                = IDEFLOPPY_VERSION,
1128         .media                  = ide_floppy,
1129         .supports_dsc_overlap   = 0,
1130         .do_request             = idefloppy_do_request,
1131         .end_request            = idefloppy_end_request,
1132         .error                  = __ide_error,
1133 #ifdef CONFIG_IDE_PROC_FS
1134         .proc                   = idefloppy_proc,
1135 #endif
1136 };
1137
1138 static int idefloppy_open(struct inode *inode, struct file *filp)
1139 {
1140         struct gendisk *disk = inode->i_bdev->bd_disk;
1141         struct ide_floppy_obj *floppy;
1142         ide_drive_t *drive;
1143         struct ide_atapi_pc pc;
1144         int ret = 0;
1145
1146         debug_log("Reached %s\n", __func__);
1147
1148         floppy = ide_floppy_get(disk);
1149         if (!floppy)
1150                 return -ENXIO;
1151
1152         drive = floppy->drive;
1153
1154         floppy->openers++;
1155
1156         if (floppy->openers == 1) {
1157                 floppy->flags &= ~IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS;
1158                 /* Just in case */
1159
1160                 idefloppy_init_pc(&pc);
1161                 pc.c[0] = GPCMD_TEST_UNIT_READY;
1162
1163                 if (idefloppy_queue_pc_tail(drive, &pc)) {
1164                         idefloppy_create_start_stop_cmd(&pc, 1);
1165                         (void) idefloppy_queue_pc_tail(drive, &pc);
1166                 }
1167
1168                 if (ide_floppy_get_capacity(drive)
1169                    && (filp->f_flags & O_NDELAY) == 0
1170                     /*
1171                      * Allow O_NDELAY to open a drive without a disk, or with an
1172                      * unreadable disk, so that we can get the format capacity
1173                      * of the drive or begin the format - Sam
1174                      */
1175                     ) {
1176                         ret = -EIO;
1177                         goto out_put_floppy;
1178                 }
1179
1180                 if (floppy->wp && (filp->f_mode & 2)) {
1181                         ret = -EROFS;
1182                         goto out_put_floppy;
1183                 }
1184                 floppy->flags |= IDEFLOPPY_FLAG_MEDIA_CHANGED;
1185                 /* IOMEGA Clik! drives do not support lock/unlock commands */
1186                 if (!(floppy->flags & IDEFLOPPY_FLAG_CLIK_DRIVE)) {
1187                         idefloppy_create_prevent_cmd(&pc, 1);
1188                         (void) idefloppy_queue_pc_tail(drive, &pc);
1189                 }
1190                 check_disk_change(inode->i_bdev);
1191         } else if (floppy->flags & IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS) {
1192                 ret = -EBUSY;
1193                 goto out_put_floppy;
1194         }
1195         return 0;
1196
1197 out_put_floppy:
1198         floppy->openers--;
1199         ide_floppy_put(floppy);
1200         return ret;
1201 }
1202
1203 static int idefloppy_release(struct inode *inode, struct file *filp)
1204 {
1205         struct gendisk *disk = inode->i_bdev->bd_disk;
1206         struct ide_floppy_obj *floppy = ide_floppy_g(disk);
1207         ide_drive_t *drive = floppy->drive;
1208         struct ide_atapi_pc pc;
1209
1210         debug_log("Reached %s\n", __func__);
1211
1212         if (floppy->openers == 1) {
1213                 /* IOMEGA Clik! drives do not support lock/unlock commands */
1214                 if (!(floppy->flags & IDEFLOPPY_FLAG_CLIK_DRIVE)) {
1215                         idefloppy_create_prevent_cmd(&pc, 0);
1216                         (void) idefloppy_queue_pc_tail(drive, &pc);
1217                 }
1218
1219                 floppy->flags &= ~IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS;
1220         }
1221
1222         floppy->openers--;
1223
1224         ide_floppy_put(floppy);
1225
1226         return 0;
1227 }
1228
1229 static int idefloppy_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1230 {
1231         struct ide_floppy_obj *floppy = ide_floppy_g(bdev->bd_disk);
1232         ide_drive_t *drive = floppy->drive;
1233
1234         geo->heads = drive->bios_head;
1235         geo->sectors = drive->bios_sect;
1236         geo->cylinders = (u16)drive->bios_cyl; /* truncate */
1237         return 0;
1238 }
1239
1240 static int ide_floppy_lockdoor(idefloppy_floppy_t *floppy,
1241                 struct ide_atapi_pc *pc, unsigned long arg, unsigned int cmd)
1242 {
1243         if (floppy->openers > 1)
1244                 return -EBUSY;
1245
1246         /* The IOMEGA Clik! Drive doesn't support this command -
1247          * no room for an eject mechanism */
1248         if (!(floppy->flags & IDEFLOPPY_FLAG_CLIK_DRIVE)) {
1249                 int prevent = arg ? 1 : 0;
1250
1251                 if (cmd == CDROMEJECT)
1252                         prevent = 0;
1253
1254                 idefloppy_create_prevent_cmd(pc, prevent);
1255                 (void) idefloppy_queue_pc_tail(floppy->drive, pc);
1256         }
1257
1258         if (cmd == CDROMEJECT) {
1259                 idefloppy_create_start_stop_cmd(pc, 2);
1260                 (void) idefloppy_queue_pc_tail(floppy->drive, pc);
1261         }
1262
1263         return 0;
1264 }
1265
1266 static int ide_floppy_format_unit(idefloppy_floppy_t *floppy,
1267                                   int __user *arg)
1268 {
1269         int blocks, length, flags, err = 0;
1270         struct ide_atapi_pc pc;
1271
1272         if (floppy->openers > 1) {
1273                 /* Don't format if someone is using the disk */
1274                 floppy->flags &= ~IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS;
1275                 return -EBUSY;
1276         }
1277
1278         floppy->flags |= IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS;
1279
1280         /*
1281          * Send ATAPI_FORMAT_UNIT to the drive.
1282          *
1283          * Userland gives us the following structure:
1284          *
1285          * struct idefloppy_format_command {
1286          *        int nblocks;
1287          *        int blocksize;
1288          *        int flags;
1289          *        } ;
1290          *
1291          * flags is a bitmask, currently, the only defined flag is:
1292          *
1293          *        0x01 - verify media after format.
1294          */
1295         if (get_user(blocks, arg) ||
1296                         get_user(length, arg+1) ||
1297                         get_user(flags, arg+2)) {
1298                 err = -EFAULT;
1299                 goto out;
1300         }
1301
1302         (void) idefloppy_get_sfrp_bit(floppy->drive);
1303         idefloppy_create_format_unit_cmd(&pc, blocks, length, flags);
1304
1305         if (idefloppy_queue_pc_tail(floppy->drive, &pc))
1306                 err = -EIO;
1307
1308 out:
1309         if (err)
1310                 floppy->flags &= ~IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS;
1311         return err;
1312 }
1313
1314
1315 static int idefloppy_ioctl(struct inode *inode, struct file *file,
1316                         unsigned int cmd, unsigned long arg)
1317 {
1318         struct block_device *bdev = inode->i_bdev;
1319         struct ide_floppy_obj *floppy = ide_floppy_g(bdev->bd_disk);
1320         ide_drive_t *drive = floppy->drive;
1321         struct ide_atapi_pc pc;
1322         void __user *argp = (void __user *)arg;
1323         int err;
1324
1325         switch (cmd) {
1326         case CDROMEJECT:
1327                 /* fall through */
1328         case CDROM_LOCKDOOR:
1329                 return ide_floppy_lockdoor(floppy, &pc, arg, cmd);
1330         case IDEFLOPPY_IOCTL_FORMAT_SUPPORTED:
1331                 return 0;
1332         case IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY:
1333                 return ide_floppy_get_format_capacities(drive, argp);
1334         case IDEFLOPPY_IOCTL_FORMAT_START:
1335                 if (!(file->f_mode & 2))
1336                         return -EPERM;
1337
1338                 return ide_floppy_format_unit(floppy, (int __user *)arg);
1339         case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS:
1340                 return idefloppy_get_format_progress(drive, argp);
1341         }
1342
1343         /*
1344          * skip SCSI_IOCTL_SEND_COMMAND (deprecated)
1345          * and CDROM_SEND_PACKET (legacy) ioctls
1346          */
1347         if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND)
1348                 err = scsi_cmd_ioctl(file, bdev->bd_disk->queue,
1349                                         bdev->bd_disk, cmd, argp);
1350         else
1351                 err = -ENOTTY;
1352
1353         if (err == -ENOTTY)
1354                 err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
1355
1356         return err;
1357 }
1358
1359 static int idefloppy_media_changed(struct gendisk *disk)
1360 {
1361         struct ide_floppy_obj *floppy = ide_floppy_g(disk);
1362         ide_drive_t *drive = floppy->drive;
1363         int ret;
1364
1365         /* do not scan partitions twice if this is a removable device */
1366         if (drive->attach) {
1367                 drive->attach = 0;
1368                 return 0;
1369         }
1370         ret = !!(floppy->flags & IDEFLOPPY_FLAG_MEDIA_CHANGED);
1371         floppy->flags &= ~IDEFLOPPY_FLAG_MEDIA_CHANGED;
1372         return ret;
1373 }
1374
1375 static int idefloppy_revalidate_disk(struct gendisk *disk)
1376 {
1377         struct ide_floppy_obj *floppy = ide_floppy_g(disk);
1378         set_capacity(disk, idefloppy_capacity(floppy->drive));
1379         return 0;
1380 }
1381
1382 static struct block_device_operations idefloppy_ops = {
1383         .owner                  = THIS_MODULE,
1384         .open                   = idefloppy_open,
1385         .release                = idefloppy_release,
1386         .ioctl                  = idefloppy_ioctl,
1387         .getgeo                 = idefloppy_getgeo,
1388         .media_changed          = idefloppy_media_changed,
1389         .revalidate_disk        = idefloppy_revalidate_disk
1390 };
1391
1392 static int ide_floppy_probe(ide_drive_t *drive)
1393 {
1394         idefloppy_floppy_t *floppy;
1395         struct gendisk *g;
1396
1397         if (!strstr("ide-floppy", drive->driver_req))
1398                 goto failed;
1399         if (!drive->present)
1400                 goto failed;
1401         if (drive->media != ide_floppy)
1402                 goto failed;
1403         if (!idefloppy_identify_device(drive, drive->id)) {
1404                 printk(KERN_ERR "ide-floppy: %s: not supported by this version"
1405                                 " of ide-floppy\n", drive->name);
1406                 goto failed;
1407         }
1408         floppy = kzalloc(sizeof(idefloppy_floppy_t), GFP_KERNEL);
1409         if (!floppy) {
1410                 printk(KERN_ERR "ide-floppy: %s: Can't allocate a floppy"
1411                                 " structure\n", drive->name);
1412                 goto failed;
1413         }
1414
1415         g = alloc_disk(1 << PARTN_BITS);
1416         if (!g)
1417                 goto out_free_floppy;
1418
1419         ide_init_disk(g, drive);
1420
1421         ide_proc_register_driver(drive, &idefloppy_driver);
1422
1423         kref_init(&floppy->kref);
1424
1425         floppy->drive = drive;
1426         floppy->driver = &idefloppy_driver;
1427         floppy->disk = g;
1428
1429         g->private_data = &floppy->driver;
1430
1431         drive->driver_data = floppy;
1432
1433         idefloppy_setup(drive, floppy);
1434
1435         g->minors = 1 << PARTN_BITS;
1436         g->driverfs_dev = &drive->gendev;
1437         g->flags = drive->removable ? GENHD_FL_REMOVABLE : 0;
1438         g->fops = &idefloppy_ops;
1439         drive->attach = 1;
1440         add_disk(g);
1441         return 0;
1442
1443 out_free_floppy:
1444         kfree(floppy);
1445 failed:
1446         return -ENODEV;
1447 }
1448
1449 static void __exit idefloppy_exit(void)
1450 {
1451         driver_unregister(&idefloppy_driver.gen_driver);
1452 }
1453
1454 static int __init idefloppy_init(void)
1455 {
1456         printk("ide-floppy driver " IDEFLOPPY_VERSION "\n");
1457         return driver_register(&idefloppy_driver.gen_driver);
1458 }
1459
1460 MODULE_ALIAS("ide:*m-floppy*");
1461 module_init(idefloppy_init);
1462 module_exit(idefloppy_exit);
1463 MODULE_LICENSE("GPL");
1464 MODULE_DESCRIPTION("ATAPI FLOPPY Driver");
1465