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 #include <linux/hdreg.h>
  32
  33 #include <asm/byteorder.h>
  34 #include <asm/irq.h>
  35 #include <asm/uaccess.h>
  36 #include <asm/io.h>
  37 #include <asm/div64.h>
  38
  39 #include "ide-disk.h"
  40
  41 static const u8 ide_rw_cmds[] = {
  42         ATA_CMD_READ_MULTI,
  43         ATA_CMD_WRITE_MULTI,
  44         ATA_CMD_READ_MULTI_EXT,
  45         ATA_CMD_WRITE_MULTI_EXT,
  46         ATA_CMD_PIO_READ,
  47         ATA_CMD_PIO_WRITE,
  48         ATA_CMD_PIO_READ_EXT,
  49         ATA_CMD_PIO_WRITE_EXT,
  50         ATA_CMD_READ,
  51         ATA_CMD_WRITE,
  52         ATA_CMD_READ_EXT,
  53         ATA_CMD_WRITE_EXT,
  54 };
  55
  56 static const u8 ide_data_phases[] = {
  57         TASKFILE_MULTI_IN,
  58         TASKFILE_MULTI_OUT,
  59         TASKFILE_IN,
  60         TASKFILE_OUT,
  61         TASKFILE_IN_DMA,
  62         TASKFILE_OUT_DMA,
  63 };
  64
  65 static void ide_tf_set_cmd(ide_drive_t *drive, ide_task_t *task, u8 dma)
  66 {
  67         u8 index, lba48, write;
  68
  69         lba48 = (task->tf_flags & IDE_TFLAG_LBA48) ? 2 : 0;
  70         write = (task->tf_flags & IDE_TFLAG_WRITE) ? 1 : 0;
  71
  72         if (dma)
  73                 index = 8;
  74         else
  75                 index = drive->mult_count ? 0 : 4;
  76
  77         task->tf.command = ide_rw_cmds[index + lba48 + write];
  78
  79         if (dma)
  80                 index = 8; /* fixup index */
  81
  82         task->data_phase = ide_data_phases[index / 2 + write];
  83 }
  84
  85 /*
  86  * __ide_do_rw_disk() issues READ and WRITE commands to a disk,
  87  * using LBA if supported, or CHS otherwise, to address sectors.
  88  */
  89 static ide_startstop_t __ide_do_rw_disk(ide_drive_t *drive, struct request *rq,
  90                                         sector_t block)
  91 {
  92         ide_hwif_t *hwif        = HWIF(drive);
  93         u16 nsectors            = (u16)rq->nr_sectors;
  94         u8 lba48                = !!(drive->dev_flags & IDE_DFLAG_LBA48);
  95         u8 dma                  = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
  96         ide_task_t              task;
  97         struct ide_taskfile     *tf = &task.tf;
  98         ide_startstop_t         rc;
  99
 100         if ((hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA) && lba48 && dma) {
 101                 if (block + rq->nr_sectors > 1ULL << 28)
 102                         dma = 0;
 103                 else
 104                         lba48 = 0;
 105         }
 106
 107         if (!dma) {
 108                 ide_init_sg_cmd(drive, rq);
 109                 ide_map_sg(drive, rq);
 110         }
 111
 112         memset(&task, 0, sizeof(task));
 113         task.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
 114
 115         if (drive->dev_flags & IDE_DFLAG_LBA) {
 116                 if (lba48) {
 117                         pr_debug("%s: LBA=0x%012llx\n", drive->name,
 118                                         (unsigned long long)block);
 119
 120                         tf->hob_nsect = (nsectors >> 8) & 0xff;
 121                         tf->hob_lbal  = (u8)(block >> 24);
 122                         if (sizeof(block) != 4) {
 123                                 tf->hob_lbam = (u8)((u64)block >> 32);
 124                                 tf->hob_lbah = (u8)((u64)block >> 40);
 125                         }
 126
 127                         tf->nsect  = nsectors & 0xff;
 128                         tf->lbal   = (u8) block;
 129                         tf->lbam   = (u8)(block >>  8);
 130                         tf->lbah   = (u8)(block >> 16);
 131
 132                         task.tf_flags |= (IDE_TFLAG_LBA48 | IDE_TFLAG_HOB);
 133                 } else {
 134                         tf->nsect  = nsectors & 0xff;
 135                         tf->lbal   = block;
 136                         tf->lbam   = block >>= 8;
 137                         tf->lbah   = block >>= 8;
 138                         tf->device = (block >> 8) & 0xf;
 139                 }
 140
 141                 tf->device |= ATA_LBA;
 142         } else {
 143                 unsigned int sect, head, cyl, track;
 144
 145                 track = (int)block / drive->sect;
 146                 sect  = (int)block % drive->sect + 1;
 147                 head  = track % drive->head;
 148                 cyl   = track / drive->head;
 149
 150                 pr_debug("%s: CHS=%u/%u/%u\n", drive->name, cyl, head, sect);
 151
 152                 tf->nsect  = nsectors & 0xff;
 153                 tf->lbal   = sect;
 154                 tf->lbam   = cyl;
 155                 tf->lbah   = cyl >> 8;
 156                 tf->device = head;
 157         }
 158
 159         if (rq_data_dir(rq))
 160                 task.tf_flags |= IDE_TFLAG_WRITE;
 161
 162         ide_tf_set_cmd(drive, &task, dma);
 163         if (!dma)
 164                 hwif->data_phase = task.data_phase;
 165         task.rq = rq;
 166
 167         rc = do_rw_taskfile(drive, &task);
 168
 169         if (rc == ide_stopped && dma) {
 170                 /* fallback to PIO */
 171                 task.tf_flags |= IDE_TFLAG_DMA_PIO_FALLBACK;
 172                 ide_tf_set_cmd(drive, &task, 0);
 173                 hwif->data_phase = task.data_phase;
 174                 ide_init_sg_cmd(drive, rq);
 175                 rc = do_rw_taskfile(drive, &task);
 176         }
 177
 178         return rc;
 179 }
 180
 181 /*
 182  * 268435455  == 137439 MB or 28bit limit
 183  * 320173056  == 163929 MB or 48bit addressing
 184  * 1073741822 == 549756 MB or 48bit addressing fake drive
 185  */
 186
 187 static ide_startstop_t ide_do_rw_disk(ide_drive_t *drive, struct request *rq,
 188                                       sector_t block)
 189 {
 190         ide_hwif_t *hwif = HWIF(drive);
 191
 192         BUG_ON(drive->dev_flags & IDE_DFLAG_BLOCKED);
 193
 194         if (!blk_fs_request(rq)) {
 195                 blk_dump_rq_flags(rq, "ide_do_rw_disk - bad command");
 196                 ide_end_request(drive, 0, 0);
 197                 return ide_stopped;
 198         }
 199
 200         ledtrig_ide_activity();
 201
 202         pr_debug("%s: %sing: block=%llu, sectors=%lu, buffer=0x%08lx\n",
 203                  drive->name, rq_data_dir(rq) == READ ? "read" : "writ",
 204                  (unsigned long long)block, rq->nr_sectors,
 205                  (unsigned long)rq->buffer);
 206
 207         if (hwif->rw_disk)
 208                 hwif->rw_disk(drive, rq);
 209
 210         return __ide_do_rw_disk(drive, rq, block);
 211 }
 212
 213 /*
 214  * Queries for true maximum capacity of the drive.
 215  * Returns maximum LBA address (> 0) of the drive, 0 if failed.
 216  */
 217 static u64 idedisk_read_native_max_address(ide_drive_t *drive, int lba48)
 218 {
 219         ide_task_t args;
 220         struct ide_taskfile *tf = &args.tf;
 221         u64 addr = 0;
 222
 223         /* Create IDE/ATA command request structure */
 224         memset(&args, 0, sizeof(ide_task_t));
 225         if (lba48)
 226                 tf->command = ATA_CMD_READ_NATIVE_MAX_EXT;
 227         else
 228                 tf->command = ATA_CMD_READ_NATIVE_MAX;
 229         tf->device  = ATA_LBA;
 230         args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
 231         if (lba48)
 232                 args.tf_flags |= (IDE_TFLAG_LBA48 | IDE_TFLAG_HOB);
 233         /* submit command request */
 234         ide_no_data_taskfile(drive, &args);
 235
 236         /* if OK, compute maximum address value */
 237         if ((tf->status & 0x01) == 0)
 238                 addr = ide_get_lba_addr(tf, lba48) + 1;
 239
 240         return addr;
 241 }
 242
 243 /*
 244  * Sets maximum virtual LBA address of the drive.
 245  * Returns new maximum virtual LBA address (> 0) or 0 on failure.
 246  */
 247 static u64 idedisk_set_max_address(ide_drive_t *drive, u64 addr_req, int lba48)
 248 {
 249         ide_task_t args;
 250         struct ide_taskfile *tf = &args.tf;
 251         u64 addr_set = 0;
 252
 253         addr_req--;
 254         /* Create IDE/ATA command request structure */
 255         memset(&args, 0, sizeof(ide_task_t));
 256         tf->lbal     = (addr_req >>  0) & 0xff;
 257         tf->lbam     = (addr_req >>= 8) & 0xff;
 258         tf->lbah     = (addr_req >>= 8) & 0xff;
 259         if (lba48) {
 260                 tf->hob_lbal = (addr_req >>= 8) & 0xff;
 261                 tf->hob_lbam = (addr_req >>= 8) & 0xff;
 262                 tf->hob_lbah = (addr_req >>= 8) & 0xff;
 263                 tf->command  = ATA_CMD_SET_MAX_EXT;
 264         } else {
 265                 tf->device   = (addr_req >>= 8) & 0x0f;
 266                 tf->command  = ATA_CMD_SET_MAX;
 267         }
 268         tf->device |= ATA_LBA;
 269         args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
 270         if (lba48)
 271                 args.tf_flags |= (IDE_TFLAG_LBA48 | IDE_TFLAG_HOB);
 272         /* submit command request */
 273         ide_no_data_taskfile(drive, &args);
 274         /* if OK, compute maximum address value */
 275         if ((tf->status & 0x01) == 0)
 276                 addr_set = ide_get_lba_addr(tf, lba48) + 1;
 277
 278         return addr_set;
 279 }
 280
 281 static unsigned long long sectors_to_MB(unsigned long long n)
 282 {
 283         n <<= 9;                /* make it bytes */
 284         do_div(n, 1000000);     /* make it MB */
 285         return n;
 286 }
 287
 288 /*
 289  * Some disks report total number of sectors instead of
 290  * maximum sector address.  We list them here.
 291  */
 292 static const struct drive_list_entry hpa_list[] = {
 293         { "ST340823A",  NULL },
 294         { "ST320413A",  NULL },
 295         { "ST310211A",  NULL },
 296         { NULL,         NULL }
 297 };
 298
 299 static void idedisk_check_hpa(ide_drive_t *drive)
 300 {
 301         unsigned long long capacity, set_max;
 302         int lba48 = ata_id_lba48_enabled(drive->id);
 303
 304         capacity = drive->capacity64;
 305
 306         set_max = idedisk_read_native_max_address(drive, lba48);
 307
 308         if (ide_in_drive_list(drive->id, hpa_list)) {
 309                 /*
 310                  * Since we are inclusive wrt to firmware revisions do this
 311                  * extra check and apply the workaround only when needed.
 312                  */
 313                 if (set_max == capacity + 1)
 314                         set_max--;
 315         }
 316
 317         if (set_max <= capacity)
 318                 return;
 319
 320         printk(KERN_INFO "%s: Host Protected Area detected.\n"
 321                          "\tcurrent capacity is %llu sectors (%llu MB)\n"
 322                          "\tnative  capacity is %llu sectors (%llu MB)\n",
 323                          drive->name,
 324                          capacity, sectors_to_MB(capacity),
 325                          set_max, sectors_to_MB(set_max));
 326
 327         set_max = idedisk_set_max_address(drive, set_max, lba48);
 328
 329         if (set_max) {
 330                 drive->capacity64 = set_max;
 331                 printk(KERN_INFO "%s: Host Protected Area disabled.\n",
 332                                  drive->name);
 333         }
 334 }
 335
 336 static int ide_disk_get_capacity(ide_drive_t *drive)
 337 {
 338         u16 *id = drive->id;
 339         int lba;
 340
 341         if (ata_id_lba48_enabled(id)) {
 342                 /* drive speaks 48-bit LBA */
 343                 lba = 1;
 344                 drive->capacity64 = ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
 345         } else if (ata_id_has_lba(id) && ata_id_is_lba_capacity_ok(id)) {
 346                 /* drive speaks 28-bit LBA */
 347                 lba = 1;
 348                 drive->capacity64 = ata_id_u32(id, ATA_ID_LBA_CAPACITY);
 349         } else {
 350                 /* drive speaks boring old 28-bit CHS */
 351                 lba = 0;
 352                 drive->capacity64 = drive->cyl * drive->head * drive->sect;
 353         }
 354
 355         if (lba) {
 356                 drive->dev_flags |= IDE_DFLAG_LBA;
 357
 358                 /*
 359                 * If this device supports the Host Protected Area feature set,
 360                 * then we may need to change our opinion about its capacity.
 361                 */
 362                 if (ata_id_hpa_enabled(id))
 363                         idedisk_check_hpa(drive);
 364         }
 365
 366         /* limit drive capacity to 137GB if LBA48 cannot be used */
 367         if ((drive->dev_flags & IDE_DFLAG_LBA48) == 0 &&
 368             drive->capacity64 > 1ULL << 28) {
 369                 printk(KERN_WARNING "%s: cannot use LBA48 - full capacity "
 370                        "%llu sectors (%llu MB)\n",
 371                        drive->name, (unsigned long long)drive->capacity64,
 372                        sectors_to_MB(drive->capacity64));
 373                 drive->capacity64 = 1ULL << 28;
 374         }
 375
 376         if ((drive->hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA) &&
 377             (drive->dev_flags & IDE_DFLAG_LBA48)) {
 378                 if (drive->capacity64 > 1ULL << 28) {
 379                         printk(KERN_INFO "%s: cannot use LBA48 DMA - PIO mode"
 380                                          " will be used for accessing sectors "
 381                                          "> %u\n", drive->name, 1 << 28);
 382                 } else
 383                         drive->dev_flags &= ~IDE_DFLAG_LBA48;
 384         }
 385
 386         return 0;
 387 }
 388
 389 static void idedisk_prepare_flush(struct request_queue *q, struct request *rq)
 390 {
 391         ide_drive_t *drive = q->queuedata;
 392         ide_task_t *task = kmalloc(sizeof(*task), GFP_ATOMIC);
 393
 394         /* FIXME: map struct ide_taskfile on rq->cmd[] */
 395         BUG_ON(task == NULL);
 396
 397         memset(task, 0, sizeof(*task));
 398         if (ata_id_flush_ext_enabled(drive->id) &&
 399             (drive->capacity64 >= (1UL << 28)))
 400                 task->tf.command = ATA_CMD_FLUSH_EXT;
 401         else
 402                 task->tf.command = ATA_CMD_FLUSH;
 403         task->tf_flags   = IDE_TFLAG_OUT_TF | IDE_TFLAG_OUT_DEVICE |
 404                            IDE_TFLAG_DYN;
 405         task->data_phase = TASKFILE_NO_DATA;
 406
 407         rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
 408         rq->cmd_flags |= REQ_SOFTBARRIER;
 409         rq->special = task;
 410 }
 411
 412 ide_devset_get(multcount, mult_count);
 413
 414 /*
 415  * This is tightly woven into the driver->do_special can not touch.
 416  * DON'T do it again until a total personality rewrite is committed.
 417  */
 418 static int set_multcount(ide_drive_t *drive, int arg)
 419 {
 420         struct request *rq;
 421         int error;
 422
 423         if (arg < 0 || arg > (drive->id[ATA_ID_MAX_MULTSECT] & 0xff))
 424                 return -EINVAL;
 425
 426         if (drive->special.b.set_multmode)
 427                 return -EBUSY;
 428
 429         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 430         rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
 431
 432         drive->mult_req = arg;
 433         drive->special.b.set_multmode = 1;
 434         error = blk_execute_rq(drive->queue, NULL, rq, 0);
 435         blk_put_request(rq);
 436
 437         return (drive->mult_count == arg) ? 0 : -EIO;
 438 }
 439
 440 ide_devset_get_flag(nowerr, IDE_DFLAG_NOWERR);
 441
 442 static int set_nowerr(ide_drive_t *drive, int arg)
 443 {
 444         if (arg < 0 || arg > 1)
 445                 return -EINVAL;
 446
 447         if (arg)
 448                 drive->dev_flags |= IDE_DFLAG_NOWERR;
 449         else
 450                 drive->dev_flags &= ~IDE_DFLAG_NOWERR;
 451
 452         drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;
 453
 454         return 0;
 455 }
 456
 457 static int ide_do_setfeature(ide_drive_t *drive, u8 feature, u8 nsect)
 458 {
 459         ide_task_t task;
 460
 461         memset(&task, 0, sizeof(task));
 462         task.tf.feature = feature;
 463         task.tf.nsect   = nsect;
 464         task.tf.command = ATA_CMD_SET_FEATURES;
 465         task.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
 466
 467         return ide_no_data_taskfile(drive, &task);
 468 }
 469
 470 static void update_ordered(ide_drive_t *drive)
 471 {
 472         u16 *id = drive->id;
 473         unsigned ordered = QUEUE_ORDERED_NONE;
 474         prepare_flush_fn *prep_fn = NULL;
 475
 476         if (drive->dev_flags & IDE_DFLAG_WCACHE) {
 477                 unsigned long long capacity;
 478                 int barrier;
 479                 /*
 480                  * We must avoid issuing commands a drive does not
 481                  * understand or we may crash it. We check flush cache
 482                  * is supported. We also check we have the LBA48 flush
 483                  * cache if the drive capacity is too large. By this
 484                  * time we have trimmed the drive capacity if LBA48 is
 485                  * not available so we don't need to recheck that.
 486                  */
 487                 capacity = ide_gd_capacity(drive);
 488                 barrier = ata_id_flush_enabled(id) &&
 489                         (drive->dev_flags & IDE_DFLAG_NOFLUSH) == 0 &&
 490                         ((drive->dev_flags & IDE_DFLAG_LBA48) == 0 ||
 491                          capacity <= (1ULL << 28) ||
 492                          ata_id_flush_ext_enabled(id));
 493
 494                 printk(KERN_INFO "%s: cache flushes %ssupported\n",
 495                        drive->name, barrier ? "" : "not ");
 496
 497                 if (barrier) {
 498                         ordered = QUEUE_ORDERED_DRAIN_FLUSH;
 499                         prep_fn = idedisk_prepare_flush;
 500                 }
 501         } else
 502                 ordered = QUEUE_ORDERED_DRAIN;
 503
 504         blk_queue_ordered(drive->queue, ordered, prep_fn);
 505 }
 506
 507 ide_devset_get_flag(wcache, IDE_DFLAG_WCACHE);
 508
 509 static int set_wcache(ide_drive_t *drive, int arg)
 510 {
 511         int err = 1;
 512
 513         if (arg < 0 || arg > 1)
 514                 return -EINVAL;
 515
 516         if (ata_id_flush_enabled(drive->id)) {
 517                 err = ide_do_setfeature(drive,
 518                         arg ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF, 0);
 519                 if (err == 0) {
 520                         if (arg)
 521                                 drive->dev_flags |= IDE_DFLAG_WCACHE;
 522                         else
 523                                 drive->dev_flags &= ~IDE_DFLAG_WCACHE;
 524                 }
 525         }
 526
 527         update_ordered(drive);
 528
 529         return err;
 530 }
 531
 532 static int do_idedisk_flushcache(ide_drive_t *drive)
 533 {
 534         ide_task_t args;
 535
 536         memset(&args, 0, sizeof(ide_task_t));
 537         if (ata_id_flush_ext_enabled(drive->id))
 538                 args.tf.command = ATA_CMD_FLUSH_EXT;
 539         else
 540                 args.tf.command = ATA_CMD_FLUSH;
 541         args.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
 542         return ide_no_data_taskfile(drive, &args);
 543 }
 544
 545 ide_devset_get(acoustic, acoustic);
 546
 547 static int set_acoustic(ide_drive_t *drive, int arg)
 548 {
 549         if (arg < 0 || arg > 254)
 550                 return -EINVAL;
 551
 552         ide_do_setfeature(drive,
 553                 arg ? SETFEATURES_AAM_ON : SETFEATURES_AAM_OFF, arg);
 554
 555         drive->acoustic = arg;
 556
 557         return 0;
 558 }
 559
 560 ide_devset_get_flag(addressing, IDE_DFLAG_LBA48);
 561
 562 /*
 563  * drive->addressing:
 564  *      0: 28-bit
 565  *      1: 48-bit
 566  *      2: 48-bit capable doing 28-bit
 567  */
 568 static int set_addressing(ide_drive_t *drive, int arg)
 569 {
 570         if (arg < 0 || arg > 2)
 571                 return -EINVAL;
 572
 573         if (arg && ((drive->hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
 574             ata_id_lba48_enabled(drive->id) == 0))
 575                 return -EIO;
 576
 577         if (arg == 2)
 578                 arg = 0;
 579
 580         if (arg)
 581                 drive->dev_flags |= IDE_DFLAG_LBA48;
 582         else
 583                 drive->dev_flags &= ~IDE_DFLAG_LBA48;
 584
 585         return 0;
 586 }
 587
 588 ide_ext_devset_rw(acoustic, acoustic);
 589 ide_ext_devset_rw(address, addressing);
 590 ide_ext_devset_rw(multcount, multcount);
 591 ide_ext_devset_rw(wcache, wcache);
 592
 593 ide_ext_devset_rw_sync(nowerr, nowerr);
 594
 595 static int ide_disk_check(ide_drive_t *drive, const char *s)
 596 {
 597         return 1;
 598 }
 599
 600 static void ide_disk_setup(ide_drive_t *drive)
 601 {
 602         struct ide_disk_obj *idkp = drive->driver_data;
 603         struct request_queue *q = drive->queue;
 604         ide_hwif_t *hwif = drive->hwif;
 605         u16 *id = drive->id;
 606         char *m = (char *)&id[ATA_ID_PROD];
 607         unsigned long long capacity;
 608
 609         ide_proc_register_driver(drive, idkp->driver);
 610
 611         if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0)
 612                 return;
 613
 614         if (drive->dev_flags & IDE_DFLAG_REMOVABLE) {
 615                 /*
 616                  * Removable disks (eg. SYQUEST); ignore 'WD' drives
 617                  */
 618                 if (m[0] != 'W' || m[1] != 'D')
 619                         drive->dev_flags |= IDE_DFLAG_DOORLOCKING;
 620         }
 621
 622         (void)set_addressing(drive, 1);
 623
 624         if (drive->dev_flags & IDE_DFLAG_LBA48) {
 625                 int max_s = 2048;
 626
 627                 if (max_s > hwif->rqsize)
 628                         max_s = hwif->rqsize;
 629
 630                 blk_queue_max_sectors(q, max_s);
 631         }
 632
 633         printk(KERN_INFO "%s: max request size: %dKiB\n", drive->name,
 634                 q->max_sectors / 2);
 635
 636         if (ata_id_is_ssd(id) || ata_id_is_cfa(id))
 637                 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
 638
 639         /* calculate drive capacity, and select LBA if possible */
 640         ide_disk_get_capacity(drive);
 641
 642         /*
 643          * if possible, give fdisk access to more of the drive,
 644          * by correcting bios_cyls:
 645          */
 646         capacity = ide_gd_capacity(drive);
 647
 648         if ((drive->dev_flags & IDE_DFLAG_FORCED_GEOM) == 0) {
 649                 if (ata_id_lba48_enabled(drive->id)) {
 650                         /* compatibility */
 651                         drive->bios_sect = 63;
 652                         drive->bios_head = 255;
 653                 }
 654
 655                 if (drive->bios_sect && drive->bios_head) {
 656                         unsigned int cap0 = capacity; /* truncate to 32 bits */
 657                         unsigned int cylsz, cyl;
 658
 659                         if (cap0 != capacity)
 660                                 drive->bios_cyl = 65535;
 661                         else {
 662                                 cylsz = drive->bios_sect * drive->bios_head;
 663                                 cyl = cap0 / cylsz;
 664                                 if (cyl > 65535)
 665                                         cyl = 65535;
 666                                 if (cyl > drive->bios_cyl)
 667                                         drive->bios_cyl = cyl;
 668                         }
 669                 }
 670         }
 671         printk(KERN_INFO "%s: %llu sectors (%llu MB)",
 672                          drive->name, capacity, sectors_to_MB(capacity));
 673
 674         /* Only print cache size when it was specified */
 675         if (id[ATA_ID_BUF_SIZE])
 676                 printk(KERN_CONT " w/%dKiB Cache", id[ATA_ID_BUF_SIZE] / 2);
 677
 678         printk(KERN_CONT ", CHS=%d/%d/%d\n",
 679                          drive->bios_cyl, drive->bios_head, drive->bios_sect);
 680
 681         /* write cache enabled? */
 682         if ((id[ATA_ID_CSFO] & 1) || ata_id_wcache_enabled(id))
 683                 drive->dev_flags |= IDE_DFLAG_WCACHE;
 684
 685         set_wcache(drive, 1);
 686
 687         if ((drive->dev_flags & IDE_DFLAG_LBA) == 0 &&
 688             (drive->head == 0 || drive->head > 16)) {
 689                 printk(KERN_ERR "%s: invalid geometry: %d physical heads?\n",
 690                         drive->name, drive->head);
 691                 drive->dev_flags &= ~IDE_DFLAG_ATTACH;
 692         } else
 693                 drive->dev_flags |= IDE_DFLAG_ATTACH;
 694 }
 695
 696 static void ide_disk_flush(ide_drive_t *drive)
 697 {
 698         if (ata_id_flush_enabled(drive->id) == 0 ||
 699             (drive->dev_flags & IDE_DFLAG_WCACHE) == 0)
 700                 return;
 701
 702         if (do_idedisk_flushcache(drive))
 703                 printk(KERN_INFO "%s: wcache flush failed!\n", drive->name);
 704 }
 705
 706 static int ide_disk_init_media(ide_drive_t *drive, struct gendisk *disk)
 707 {
 708         return 0;
 709 }
 710
 711 static int ide_disk_set_doorlock(ide_drive_t *drive, struct gendisk *disk,
 712                                  int on)
 713 {
 714         ide_task_t task;
 715         int ret;
 716
 717         if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0)
 718                 return 0;
 719
 720         memset(&task, 0, sizeof(task));
 721         task.tf.command = on ? ATA_CMD_MEDIA_LOCK : ATA_CMD_MEDIA_UNLOCK;
 722         task.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
 723
 724         ret = ide_no_data_taskfile(drive, &task);
 725
 726         if (ret)
 727                 drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
 728
 729         return ret;
 730 }
 731
 732 const struct ide_disk_ops ide_ata_disk_ops = {
 733         .check          = ide_disk_check,
 734         .get_capacity   = ide_disk_get_capacity,
 735         .setup          = ide_disk_setup,
 736         .flush          = ide_disk_flush,
 737         .init_media     = ide_disk_init_media,
 738         .set_doorlock   = ide_disk_set_doorlock,
 739         .do_request     = ide_do_rw_disk,
 740         .end_request    = ide_end_request,
 741         .ioctl          = ide_disk_ioctl,
 742 };