drivers/ide/ide-disk.c

   1 /*
   2  *  Copyright (C) 1994-1998        Linus Torvalds & authors (see below)
   3  *  Copyright (C) 1998-2002        Linux ATA Development
   4  *                                    Andre Hedrick <andre@linux-ide.org>
   5  *  Copyright (C) 2003             Red Hat
   6  *  Copyright (C) 2003-2005, 2007  Bartlomiej Zolnierkiewicz
   7  */
   8
   9 /*
  10  *  Mostly written by Mark Lord <mlord@pobox.com>
  11  *                and Gadi Oxman <gadio@netvision.net.il>
  12  *                and Andre Hedrick <andre@linux-ide.org>
  13  *
  14  * This is the IDE/ATA disk driver, as evolved from hd.c and ide.c.
  15  */
  16
  17 #include <linux/types.h>
  18 #include <linux/string.h>
  19 #include <linux/kernel.h>
  20 #include <linux/timer.h>
  21 #include <linux/mm.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/major.h>
  24 #include <linux/errno.h>
  25 #include <linux/genhd.h>
  26 #include <linux/slab.h>
  27 #include <linux/delay.h>
  28 #include <linux/mutex.h>
  29 #include <linux/leds.h>
  30 #include <linux/ide.h>
  31
  32 #include <asm/byteorder.h>
  33 #include <asm/irq.h>
  34 #include <asm/uaccess.h>
  35 #include <asm/io.h>
  36 #include <asm/div64.h>
  37
  38 #include "ide-disk.h"
  39
  40 static const u8 ide_rw_cmds[] = {
  41         ATA_CMD_READ_MULTI,
  42         ATA_CMD_WRITE_MULTI,
  43         ATA_CMD_READ_MULTI_EXT,
  44         ATA_CMD_WRITE_MULTI_EXT,
  45         ATA_CMD_PIO_READ,
  46         ATA_CMD_PIO_WRITE,
  47         ATA_CMD_PIO_READ_EXT,
  48         ATA_CMD_PIO_WRITE_EXT,
  49         ATA_CMD_READ,
  50         ATA_CMD_WRITE,
  51         ATA_CMD_READ_EXT,
  52         ATA_CMD_WRITE_EXT,
  53 };
  54
  55 static void ide_tf_set_cmd(ide_drive_t *drive, struct ide_cmd *cmd, u8 dma)
  56 {
  57         u8 index, lba48, write;
  58
  59         lba48 = (cmd->tf_flags & IDE_TFLAG_LBA48) ? 2 : 0;
  60         write = (cmd->tf_flags & IDE_TFLAG_WRITE) ? 1 : 0;
  61
  62         if (dma) {
  63                 cmd->protocol = ATA_PROT_DMA;
  64                 index = 8;
  65         } else {
  66                 cmd->protocol = ATA_PROT_PIO;
  67                 if (drive->mult_count) {
  68                         cmd->tf_flags |= IDE_TFLAG_MULTI_PIO;
  69                         index = 0;
  70                 } else
  71                         index = 4;
  72         }
  73
  74         cmd->tf.command = ide_rw_cmds[index + lba48 + write];
  75 }
  76
  77 /*
  78  * __ide_do_rw_disk() issues READ and WRITE commands to a disk,
  79  * using LBA if supported, or CHS otherwise, to address sectors.
  80  */
  81 static ide_startstop_t __ide_do_rw_disk(ide_drive_t *drive, struct request *rq,
  82                                         sector_t block)
  83 {
  84         ide_hwif_t *hwif        = drive->hwif;
  85         u16 nsectors            = (u16)rq->nr_sectors;
  86         u8 lba48                = !!(drive->dev_flags & IDE_DFLAG_LBA48);
  87         u8 dma                  = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
  88         struct ide_cmd          cmd;
  89         struct ide_taskfile     *tf = &cmd.tf;
  90         ide_startstop_t         rc;
  91
  92         if ((hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA) && lba48 && dma) {
  93                 if (block + rq->nr_sectors > 1ULL << 28)
  94                         dma = 0;
  95                 else
  96                         lba48 = 0;
  97         }
  98
  99         memset(&cmd, 0, sizeof(cmd));
 100         cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
 101
 102         if (drive->dev_flags & IDE_DFLAG_LBA) {
 103                 if (lba48) {
 104                         pr_debug("%s: LBA=0x%012llx\n", drive->name,
 105                                         (unsigned long long)block);
 106
 107                         tf->hob_nsect = (nsectors >> 8) & 0xff;
 108                         tf->hob_lbal  = (u8)(block >> 24);
 109                         if (sizeof(block) != 4) {
 110                                 tf->hob_lbam = (u8)((u64)block >> 32);
 111                                 tf->hob_lbah = (u8)((u64)block >> 40);
 112                         }
 113
 114                         tf->nsect  = nsectors & 0xff;
 115                         tf->lbal   = (u8) block;
 116                         tf->lbam   = (u8)(block >>  8);
 117                         tf->lbah   = (u8)(block >> 16);
 118
 119                         cmd.tf_flags |= (IDE_TFLAG_LBA48 | IDE_TFLAG_HOB);
 120                 } else {
 121                         tf->nsect  = nsectors & 0xff;
 122                         tf->lbal   = block;
 123                         tf->lbam   = block >>= 8;
 124                         tf->lbah   = block >>= 8;
 125                         tf->device = (block >> 8) & 0xf;
 126                 }
 127
 128                 tf->device |= ATA_LBA;
 129         } else {
 130                 unsigned int sect, head, cyl, track;
 131
 132                 track = (int)block / drive->sect;
 133                 sect  = (int)block % drive->sect + 1;
 134                 head  = track % drive->head;
 135                 cyl   = track / drive->head;
 136
 137                 pr_debug("%s: CHS=%u/%u/%u\n", drive->name, cyl, head, sect);
 138
 139                 tf->nsect  = nsectors & 0xff;
 140                 tf->lbal   = sect;
 141                 tf->lbam   = cyl;
 142                 tf->lbah   = cyl >> 8;
 143                 tf->device = head;
 144         }
 145
 146         cmd.tf_flags |= IDE_TFLAG_FS;
 147
 148         if (rq_data_dir(rq))
 149                 cmd.tf_flags |= IDE_TFLAG_WRITE;
 150
 151         ide_tf_set_cmd(drive, &cmd, dma);
 152         cmd.rq = rq;
 153
 154         if (dma == 0) {
 155                 ide_init_sg_cmd(&cmd, nsectors << 9);
 156                 ide_map_sg(drive, &cmd);
 157         }
 158
 159         rc = do_rw_taskfile(drive, &cmd);
 160
 161         if (rc == ide_stopped && dma) {
 162                 /* fallback to PIO */
 163                 cmd.tf_flags |= IDE_TFLAG_DMA_PIO_FALLBACK;
 164                 ide_tf_set_cmd(drive, &cmd, 0);
 165                 ide_init_sg_cmd(&cmd, nsectors << 9);
 166                 rc = do_rw_taskfile(drive, &cmd);
 167         }
 168
 169         return rc;
 170 }
 171
 172 /*
 173  * 268435455  == 137439 MB or 28bit limit
 174  * 320173056  == 163929 MB or 48bit addressing
 175  * 1073741822 == 549756 MB or 48bit addressing fake drive
 176  */
 177
 178 static ide_startstop_t ide_do_rw_disk(ide_drive_t *drive, struct request *rq,
 179                                       sector_t block)
 180 {
 181         ide_hwif_t *hwif = drive->hwif;
 182
 183         BUG_ON(drive->dev_flags & IDE_DFLAG_BLOCKED);
 184
 185         if (!blk_fs_request(rq)) {
 186                 blk_dump_rq_flags(rq, "ide_do_rw_disk - bad command");
 187                 if (rq->errors == 0)
 188                         rq->errors = -EIO;
 189                 ide_complete_rq(drive, -EIO, ide_rq_bytes(rq));
 190                 return ide_stopped;
 191         }
 192
 193         ledtrig_ide_activity();
 194
 195         pr_debug("%s: %sing: block=%llu, sectors=%lu, buffer=0x%08lx\n",
 196                  drive->name, rq_data_dir(rq) == READ ? "read" : "writ",
 197                  (unsigned long long)block, rq->nr_sectors,
 198                  (unsigned long)rq->buffer);
 199
 200         if (hwif->rw_disk)
 201                 hwif->rw_disk(drive, rq);
 202
 203         return __ide_do_rw_disk(drive, rq, block);
 204 }
 205
 206 /*
 207  * Queries for true maximum capacity of the drive.
 208  * Returns maximum LBA address (> 0) of the drive, 0 if failed.
 209  */
 210 static u64 idedisk_read_native_max_address(ide_drive_t *drive, int lba48)
 211 {
 212         struct ide_cmd cmd;
 213         struct ide_taskfile *tf = &cmd.tf;
 214         u64 addr = 0;
 215
 216         memset(&cmd, 0, sizeof(cmd));
 217         if (lba48)
 218                 tf->command = ATA_CMD_READ_NATIVE_MAX_EXT;
 219         else
 220                 tf->command = ATA_CMD_READ_NATIVE_MAX;
 221         tf->device  = ATA_LBA;
 222
 223         cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
 224         if (lba48)
 225                 cmd.tf_flags |= (IDE_TFLAG_LBA48 | IDE_TFLAG_HOB);
 226
 227         ide_no_data_taskfile(drive, &cmd);
 228
 229         /* if OK, compute maximum address value */
 230         if (!(tf->status & ATA_ERR))
 231                 addr = ide_get_lba_addr(tf, lba48) + 1;
 232
 233         return addr;
 234 }
 235
 236 /*
 237  * Sets maximum virtual LBA address of the drive.
 238  * Returns new maximum virtual LBA address (> 0) or 0 on failure.
 239  */
 240 static u64 idedisk_set_max_address(ide_drive_t *drive, u64 addr_req, int lba48)
 241 {
 242         struct ide_cmd cmd;
 243         struct ide_taskfile *tf = &cmd.tf;
 244         u64 addr_set = 0;
 245
 246         addr_req--;
 247
 248         memset(&cmd, 0, sizeof(cmd));
 249         tf->lbal     = (addr_req >>  0) & 0xff;
 250         tf->lbam     = (addr_req >>= 8) & 0xff;
 251         tf->lbah     = (addr_req >>= 8) & 0xff;
 252         if (lba48) {
 253                 tf->hob_lbal = (addr_req >>= 8) & 0xff;
 254                 tf->hob_lbam = (addr_req >>= 8) & 0xff;
 255                 tf->hob_lbah = (addr_req >>= 8) & 0xff;
 256                 tf->command  = ATA_CMD_SET_MAX_EXT;
 257         } else {
 258                 tf->device   = (addr_req >>= 8) & 0x0f;
 259                 tf->command  = ATA_CMD_SET_MAX;
 260         }
 261         tf->device |= ATA_LBA;
 262
 263         cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
 264         if (lba48)
 265                 cmd.tf_flags |= (IDE_TFLAG_LBA48 | IDE_TFLAG_HOB);
 266
 267         ide_no_data_taskfile(drive, &cmd);
 268
 269         /* if OK, compute maximum address value */
 270         if (!(tf->status & ATA_ERR))
 271                 addr_set = ide_get_lba_addr(tf, lba48) + 1;
 272
 273         return addr_set;
 274 }
 275
 276 static unsigned long long sectors_to_MB(unsigned long long n)
 277 {
 278         n <<= 9;                /* make it bytes */
 279         do_div(n, 1000000);     /* make it MB */
 280         return n;
 281 }
 282
 283 /*
 284  * Some disks report total number of sectors instead of
 285  * maximum sector address.  We list them here.
 286  */
 287 static const struct drive_list_entry hpa_list[] = {
 288         { "ST340823A",  NULL },
 289         { "ST320413A",  NULL },
 290         { "ST310211A",  NULL },
 291         { NULL,         NULL }
 292 };
 293
 294 static void idedisk_check_hpa(ide_drive_t *drive)
 295 {
 296         unsigned long long capacity, set_max;
 297         int lba48 = ata_id_lba48_enabled(drive->id);
 298
 299         capacity = drive->capacity64;
 300
 301         set_max = idedisk_read_native_max_address(drive, lba48);
 302
 303         if (ide_in_drive_list(drive->id, hpa_list)) {
 304                 /*
 305                  * Since we are inclusive wrt to firmware revisions do this
 306                  * extra check and apply the workaround only when needed.
 307                  */
 308                 if (set_max == capacity + 1)
 309                         set_max--;
 310         }
 311
 312         if (set_max <= capacity)
 313                 return;
 314
 315         printk(KERN_INFO "%s: Host Protected Area detected.\n"
 316                          "\tcurrent capacity is %llu sectors (%llu MB)\n"
 317                          "\tnative  capacity is %llu sectors (%llu MB)\n",
 318                          drive->name,
 319                          capacity, sectors_to_MB(capacity),
 320                          set_max, sectors_to_MB(set_max));
 321
 322         set_max = idedisk_set_max_address(drive, set_max, lba48);
 323
 324         if (set_max) {
 325                 drive->capacity64 = set_max;
 326                 printk(KERN_INFO "%s: Host Protected Area disabled.\n",
 327                                  drive->name);
 328         }
 329 }
 330
 331 static int ide_disk_get_capacity(ide_drive_t *drive)
 332 {
 333         u16 *id = drive->id;
 334         int lba;
 335
 336         if (ata_id_lba48_enabled(id)) {
 337                 /* drive speaks 48-bit LBA */
 338                 lba = 1;
 339                 drive->capacity64 = ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
 340         } else if (ata_id_has_lba(id) && ata_id_is_lba_capacity_ok(id)) {
 341                 /* drive speaks 28-bit LBA */
 342                 lba = 1;
 343                 drive->capacity64 = ata_id_u32(id, ATA_ID_LBA_CAPACITY);
 344         } else {
 345                 /* drive speaks boring old 28-bit CHS */
 346                 lba = 0;
 347                 drive->capacity64 = drive->cyl * drive->head * drive->sect;
 348         }
 349
 350         if (lba) {
 351                 drive->dev_flags |= IDE_DFLAG_LBA;
 352
 353                 /*
 354                 * If this device supports the Host Protected Area feature set,
 355                 * then we may need to change our opinion about its capacity.
 356                 */
 357                 if (ata_id_hpa_enabled(id))
 358                         idedisk_check_hpa(drive);
 359         }
 360
 361         /* limit drive capacity to 137GB if LBA48 cannot be used */
 362         if ((drive->dev_flags & IDE_DFLAG_LBA48) == 0 &&
 363             drive->capacity64 > 1ULL << 28) {
 364                 printk(KERN_WARNING "%s: cannot use LBA48 - full capacity "
 365                        "%llu sectors (%llu MB)\n",
 366                        drive->name, (unsigned long long)drive->capacity64,
 367                        sectors_to_MB(drive->capacity64));
 368                 drive->capacity64 = 1ULL << 28;
 369         }
 370
 371         if ((drive->hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA) &&
 372             (drive->dev_flags & IDE_DFLAG_LBA48)) {
 373                 if (drive->capacity64 > 1ULL << 28) {
 374                         printk(KERN_INFO "%s: cannot use LBA48 DMA - PIO mode"
 375                                          " will be used for accessing sectors "
 376                                          "> %u\n", drive->name, 1 << 28);
 377                 } else
 378                         drive->dev_flags &= ~IDE_DFLAG_LBA48;
 379         }
 380
 381         return 0;
 382 }
 383
 384 static void idedisk_prepare_flush(struct request_queue *q, struct request *rq)
 385 {
 386         ide_drive_t *drive = q->queuedata;
 387         struct ide_cmd *cmd = kmalloc(sizeof(*cmd), GFP_ATOMIC);
 388
 389         /* FIXME: map struct ide_taskfile on rq->cmd[] */
 390         BUG_ON(cmd == NULL);
 391
 392         memset(cmd, 0, sizeof(*cmd));
 393         if (ata_id_flush_ext_enabled(drive->id) &&
 394             (drive->capacity64 >= (1UL << 28)))
 395                 cmd->tf.command = ATA_CMD_FLUSH_EXT;
 396         else
 397                 cmd->tf.command = ATA_CMD_FLUSH;
 398         cmd->tf_flags = IDE_TFLAG_OUT_TF | IDE_TFLAG_OUT_DEVICE |
 399                         IDE_TFLAG_DYN;
 400         cmd->protocol = ATA_PROT_NODATA;
 401
 402         rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
 403         rq->cmd_flags |= REQ_SOFTBARRIER;
 404         rq->special = cmd;
 405 }
 406
 407 ide_devset_get(multcount, mult_count);
 408
 409 /*
 410  * This is tightly woven into the driver->do_special can not touch.
 411  * DON'T do it again until a total personality rewrite is committed.
 412  */
 413 static int set_multcount(ide_drive_t *drive, int arg)
 414 {
 415         struct request *rq;
 416         int error;
 417
 418         if (arg < 0 || arg > (drive->id[ATA_ID_MAX_MULTSECT] & 0xff))
 419                 return -EINVAL;
 420
 421         if (drive->special.b.set_multmode)
 422                 return -EBUSY;
 423
 424         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 425         rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
 426
 427         drive->mult_req = arg;
 428         drive->special.b.set_multmode = 1;
 429         error = blk_execute_rq(drive->queue, NULL, rq, 0);
 430         blk_put_request(rq);
 431
 432         return (drive->mult_count == arg) ? 0 : -EIO;
 433 }
 434
 435 ide_devset_get_flag(nowerr, IDE_DFLAG_NOWERR);
 436
 437 static int set_nowerr(ide_drive_t *drive, int arg)
 438 {
 439         if (arg < 0 || arg > 1)
 440                 return -EINVAL;
 441
 442         if (arg)
 443                 drive->dev_flags |= IDE_DFLAG_NOWERR;
 444         else
 445                 drive->dev_flags &= ~IDE_DFLAG_NOWERR;
 446
 447         drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;
 448
 449         return 0;
 450 }
 451
 452 static int ide_do_setfeature(ide_drive_t *drive, u8 feature, u8 nsect)
 453 {
 454         struct ide_cmd cmd;
 455
 456         memset(&cmd, 0, sizeof(cmd));
 457         cmd.tf.feature = feature;
 458         cmd.tf.nsect   = nsect;
 459         cmd.tf.command = ATA_CMD_SET_FEATURES;
 460         cmd.tf_flags   = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
 461
 462         return ide_no_data_taskfile(drive, &cmd);
 463 }
 464
 465 static void update_ordered(ide_drive_t *drive)
 466 {
 467         u16 *id = drive->id;
 468         unsigned ordered = QUEUE_ORDERED_NONE;
 469         prepare_flush_fn *prep_fn = NULL;
 470
 471         if (drive->dev_flags & IDE_DFLAG_WCACHE) {
 472                 unsigned long long capacity;
 473                 int barrier;
 474                 /*
 475                  * We must avoid issuing commands a drive does not
 476                  * understand or we may crash it. We check flush cache
 477                  * is supported. We also check we have the LBA48 flush
 478                  * cache if the drive capacity is too large. By this
 479                  * time we have trimmed the drive capacity if LBA48 is
 480                  * not available so we don't need to recheck that.
 481                  */
 482                 capacity = ide_gd_capacity(drive);
 483                 barrier = ata_id_flush_enabled(id) &&
 484                         (drive->dev_flags & IDE_DFLAG_NOFLUSH) == 0 &&
 485                         ((drive->dev_flags & IDE_DFLAG_LBA48) == 0 ||
 486                          capacity <= (1ULL << 28) ||
 487                          ata_id_flush_ext_enabled(id));
 488
 489                 printk(KERN_INFO "%s: cache flushes %ssupported\n",
 490                        drive->name, barrier ? "" : "not ");
 491
 492                 if (barrier) {
 493                         ordered = QUEUE_ORDERED_DRAIN_FLUSH;
 494                         prep_fn = idedisk_prepare_flush;
 495                 }
 496         } else
 497                 ordered = QUEUE_ORDERED_DRAIN;
 498
 499         blk_queue_ordered(drive->queue, ordered, prep_fn);
 500 }
 501
 502 ide_devset_get_flag(wcache, IDE_DFLAG_WCACHE);
 503
 504 static int set_wcache(ide_drive_t *drive, int arg)
 505 {
 506         int err = 1;
 507
 508         if (arg < 0 || arg > 1)
 509                 return -EINVAL;
 510
 511         if (ata_id_flush_enabled(drive->id)) {
 512                 err = ide_do_setfeature(drive,
 513                         arg ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF, 0);
 514                 if (err == 0) {
 515                         if (arg)
 516                                 drive->dev_flags |= IDE_DFLAG_WCACHE;
 517                         else
 518                                 drive->dev_flags &= ~IDE_DFLAG_WCACHE;
 519                 }
 520         }
 521
 522         update_ordered(drive);
 523
 524         return err;
 525 }
 526
 527 static int do_idedisk_flushcache(ide_drive_t *drive)
 528 {
 529         struct ide_cmd cmd;
 530
 531         memset(&cmd, 0, sizeof(cmd));
 532         if (ata_id_flush_ext_enabled(drive->id))
 533                 cmd.tf.command = ATA_CMD_FLUSH_EXT;
 534         else
 535                 cmd.tf.command = ATA_CMD_FLUSH;
 536         cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
 537
 538         return ide_no_data_taskfile(drive, &cmd);
 539 }
 540
 541 ide_devset_get(acoustic, acoustic);
 542
 543 static int set_acoustic(ide_drive_t *drive, int arg)
 544 {
 545         if (arg < 0 || arg > 254)
 546                 return -EINVAL;
 547
 548         ide_do_setfeature(drive,
 549                 arg ? SETFEATURES_AAM_ON : SETFEATURES_AAM_OFF, arg);
 550
 551         drive->acoustic = arg;
 552
 553         return 0;
 554 }
 555
 556 ide_devset_get_flag(addressing, IDE_DFLAG_LBA48);
 557
 558 /*
 559  * drive->addressing:
 560  *      0: 28-bit
 561  *      1: 48-bit
 562  *      2: 48-bit capable doing 28-bit
 563  */
 564 static int set_addressing(ide_drive_t *drive, int arg)
 565 {
 566         if (arg < 0 || arg > 2)
 567                 return -EINVAL;
 568
 569         if (arg && ((drive->hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
 570             ata_id_lba48_enabled(drive->id) == 0))
 571                 return -EIO;
 572
 573         if (arg == 2)
 574                 arg = 0;
 575
 576         if (arg)
 577                 drive->dev_flags |= IDE_DFLAG_LBA48;
 578         else
 579                 drive->dev_flags &= ~IDE_DFLAG_LBA48;
 580
 581         return 0;
 582 }
 583
 584 ide_ext_devset_rw(acoustic, acoustic);
 585 ide_ext_devset_rw(address, addressing);
 586 ide_ext_devset_rw(multcount, multcount);
 587 ide_ext_devset_rw(wcache, wcache);
 588
 589 ide_ext_devset_rw_sync(nowerr, nowerr);
 590
 591 static int ide_disk_check(ide_drive_t *drive, const char *s)
 592 {
 593         return 1;
 594 }
 595
 596 static void ide_disk_setup(ide_drive_t *drive)
 597 {
 598         struct ide_disk_obj *idkp = drive->driver_data;
 599         struct request_queue *q = drive->queue;
 600         ide_hwif_t *hwif = drive->hwif;
 601         u16 *id = drive->id;
 602         char *m = (char *)&id[ATA_ID_PROD];
 603         unsigned long long capacity;
 604
 605         ide_proc_register_driver(drive, idkp->driver);
 606
 607         if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0)
 608                 return;
 609
 610         if (drive->dev_flags & IDE_DFLAG_REMOVABLE) {
 611                 /*
 612                  * Removable disks (eg. SYQUEST); ignore 'WD' drives
 613                  */
 614                 if (m[0] != 'W' || m[1] != 'D')
 615                         drive->dev_flags |= IDE_DFLAG_DOORLOCKING;
 616         }
 617
 618         (void)set_addressing(drive, 1);
 619
 620         if (drive->dev_flags & IDE_DFLAG_LBA48) {
 621                 int max_s = 2048;
 622
 623                 if (max_s > hwif->rqsize)
 624                         max_s = hwif->rqsize;
 625
 626                 blk_queue_max_sectors(q, max_s);
 627         }
 628
 629         printk(KERN_INFO "%s: max request size: %dKiB\n", drive->name,
 630                 q->max_sectors / 2);
 631
 632         if (ata_id_is_ssd(id))
 633                 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
 634
 635         /* calculate drive capacity, and select LBA if possible */
 636         ide_disk_get_capacity(drive);
 637
 638         /*
 639          * if possible, give fdisk access to more of the drive,
 640          * by correcting bios_cyls:
 641          */
 642         capacity = ide_gd_capacity(drive);
 643
 644         if ((drive->dev_flags & IDE_DFLAG_FORCED_GEOM) == 0) {
 645                 if (ata_id_lba48_enabled(drive->id)) {
 646                         /* compatibility */
 647                         drive->bios_sect = 63;
 648                         drive->bios_head = 255;
 649                 }
 650
 651                 if (drive->bios_sect && drive->bios_head) {
 652                         unsigned int cap0 = capacity; /* truncate to 32 bits */
 653                         unsigned int cylsz, cyl;
 654
 655                         if (cap0 != capacity)
 656                                 drive->bios_cyl = 65535;
 657                         else {
 658                                 cylsz = drive->bios_sect * drive->bios_head;
 659                                 cyl = cap0 / cylsz;
 660                                 if (cyl > 65535)
 661                                         cyl = 65535;
 662                                 if (cyl > drive->bios_cyl)
 663                                         drive->bios_cyl = cyl;
 664                         }
 665                 }
 666         }
 667         printk(KERN_INFO "%s: %llu sectors (%llu MB)",
 668                          drive->name, capacity, sectors_to_MB(capacity));
 669
 670         /* Only print cache size when it was specified */
 671         if (id[ATA_ID_BUF_SIZE])
 672                 printk(KERN_CONT " w/%dKiB Cache", id[ATA_ID_BUF_SIZE] / 2);
 673
 674         printk(KERN_CONT ", CHS=%d/%d/%d\n",
 675                          drive->bios_cyl, drive->bios_head, drive->bios_sect);
 676
 677         /* write cache enabled? */
 678         if ((id[ATA_ID_CSFO] & 1) || ata_id_wcache_enabled(id))
 679                 drive->dev_flags |= IDE_DFLAG_WCACHE;
 680
 681         set_wcache(drive, 1);
 682
 683         if ((drive->dev_flags & IDE_DFLAG_LBA) == 0 &&
 684             (drive->head == 0 || drive->head > 16)) {
 685                 printk(KERN_ERR "%s: invalid geometry: %d physical heads?\n",
 686                         drive->name, drive->head);
 687                 drive->dev_flags &= ~IDE_DFLAG_ATTACH;
 688         } else
 689                 drive->dev_flags |= IDE_DFLAG_ATTACH;
 690 }
 691
 692 static void ide_disk_flush(ide_drive_t *drive)
 693 {
 694         if (ata_id_flush_enabled(drive->id) == 0 ||
 695             (drive->dev_flags & IDE_DFLAG_WCACHE) == 0)
 696                 return;
 697
 698         if (do_idedisk_flushcache(drive))
 699                 printk(KERN_INFO "%s: wcache flush failed!\n", drive->name);
 700 }
 701
 702 static int ide_disk_init_media(ide_drive_t *drive, struct gendisk *disk)
 703 {
 704         return 0;
 705 }
 706
 707 static int ide_disk_set_doorlock(ide_drive_t *drive, struct gendisk *disk,
 708                                  int on)
 709 {
 710         struct ide_cmd cmd;
 711         int ret;
 712
 713         if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0)
 714                 return 0;
 715
 716         memset(&cmd, 0, sizeof(cmd));
 717         cmd.tf.command = on ? ATA_CMD_MEDIA_LOCK : ATA_CMD_MEDIA_UNLOCK;
 718         cmd.tf_flags   = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
 719
 720         ret = ide_no_data_taskfile(drive, &cmd);
 721
 722         if (ret)
 723                 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
 724
 725         return ret;
 726 }
 727
 728 const struct ide_disk_ops ide_ata_disk_ops = {
 729         .check          = ide_disk_check,
 730         .get_capacity   = ide_disk_get_capacity,
 731         .setup          = ide_disk_setup,
 732         .flush          = ide_disk_flush,
 733         .init_media     = ide_disk_init_media,
 734         .set_doorlock   = ide_disk_set_doorlock,
 735         .do_request     = ide_do_rw_disk,
 736         .ioctl          = ide_disk_ioctl,
 737 };