git.oblomov.eu Git - linux-2.6/blob - drivers/ide/ide-disk.c

   1 /*
   2  *  linux/drivers/ide/ide-disk.c        Version 1.18    Mar 05, 2003
   3  *
   4  *  Copyright (C) 1994-1998  Linus Torvalds & authors (see below)
   5  *  Copyright (C) 1998-2002  Linux ATA Development
   6  *                              Andre Hedrick <andre@linux-ide.org>
   7  *  Copyright (C) 2003       Red Hat <alan@redhat.com>
   8  */
   9
  10 /*
  11  *  Mostly written by Mark Lord <mlord@pobox.com>
  12  *                and Gadi Oxman <gadio@netvision.net.il>
  13  *                and Andre Hedrick <andre@linux-ide.org>
  14  *
  15  * This is the IDE/ATA disk driver, as evolved from hd.c and ide.c.
  16  *
  17  * Version 1.00         move disk only code from ide.c to ide-disk.c
  18  *                      support optional byte-swapping of all data
  19  * Version 1.01         fix previous byte-swapping code
  20  * Version 1.02         remove ", LBA" from drive identification msgs
  21  * Version 1.03         fix display of id->buf_size for big-endian
  22  * Version 1.04         add /proc configurable settings and S.M.A.R.T support
  23  * Version 1.05         add capacity support for ATA3 >= 8GB
  24  * Version 1.06         get boot-up messages to show full cyl count
  25  * Version 1.07         disable door-locking if it fails
  26  * Version 1.08         fixed CHS/LBA translations for ATA4 > 8GB,
  27  *                      process of adding new ATA4 compliance.
  28  *                      fixed problems in allowing fdisk to see
  29  *                      the entire disk.
  30  * Version 1.09         added increment of rq->sector in ide_multwrite
  31  *                      added UDMA 3/4 reporting
  32  * Version 1.10         request queue changes, Ultra DMA 100
  33  * Version 1.11         added 48-bit lba
  34  * Version 1.12         adding taskfile io access method
  35  * Version 1.13         added standby and flush-cache for notifier
  36  * Version 1.14         added acoustic-wcache
  37  * Version 1.15         convert all calls to ide_raw_taskfile
  38  *                              since args will return register content.
  39  * Version 1.16         added suspend-resume-checkpower
  40  * Version 1.17         do flush on standby, do flush on ATA < ATA6
  41  *                      fix wcache setup.
  42  */
  43
  44 #define IDEDISK_VERSION "1.18"
  45
  46 #undef REALLY_SLOW_IO           /* most systems can safely undef this */
  47
  48 //#define DEBUG
  49
  50 #include <linux/module.h>
  51 #include <linux/types.h>
  52 #include <linux/string.h>
  53 #include <linux/kernel.h>
  54 #include <linux/timer.h>
  55 #include <linux/mm.h>
  56 #include <linux/interrupt.h>
  57 #include <linux/major.h>
  58 #include <linux/errno.h>
  59 #include <linux/genhd.h>
  60 #include <linux/slab.h>
  61 #include <linux/delay.h>
  62 #include <linux/mutex.h>
  63 #include <linux/leds.h>
  64
  65 #define _IDE_DISK
  66
  67 #include <linux/ide.h>
  68
  69 #include <asm/byteorder.h>
  70 #include <asm/irq.h>
  71 #include <asm/uaccess.h>
  72 #include <asm/io.h>
  73 #include <asm/div64.h>
  74
  75 struct ide_disk_obj {
  76         ide_drive_t     *drive;
  77         ide_driver_t    *driver;
  78         struct gendisk  *disk;
  79         struct kref     kref;
  80 };
  81
  82 static DEFINE_MUTEX(idedisk_ref_mutex);
  83
  84 #define to_ide_disk(obj) container_of(obj, struct ide_disk_obj, kref)
  85
  86 #define ide_disk_g(disk) \
  87         container_of((disk)->private_data, struct ide_disk_obj, driver)
  88
  89 static struct ide_disk_obj *ide_disk_get(struct gendisk *disk)
  90 {
  91         struct ide_disk_obj *idkp = NULL;
  92
  93         mutex_lock(&idedisk_ref_mutex);
  94         idkp = ide_disk_g(disk);
  95         if (idkp)
  96                 kref_get(&idkp->kref);
  97         mutex_unlock(&idedisk_ref_mutex);
  98         return idkp;
  99 }
 100
 101 static void ide_disk_release(struct kref *);
 102
 103 static void ide_disk_put(struct ide_disk_obj *idkp)
 104 {
 105         mutex_lock(&idedisk_ref_mutex);
 106         kref_put(&idkp->kref, ide_disk_release);
 107         mutex_unlock(&idedisk_ref_mutex);
 108 }
 109
 110 /*
 111  * lba_capacity_is_ok() performs a sanity check on the claimed "lba_capacity"
 112  * value for this drive (from its reported identification information).
 113  *
 114  * Returns:     1 if lba_capacity looks sensible
 115  *              0 otherwise
 116  *
 117  * It is called only once for each drive.
 118  */
 119 static int lba_capacity_is_ok (struct hd_driveid *id)
 120 {
 121         unsigned long lba_sects, chs_sects, head, tail;
 122
 123         /* No non-LBA info .. so valid! */
 124         if (id->cyls == 0)
 125                 return 1;
 126
 127         /*
 128          * The ATA spec tells large drives to return
 129          * C/H/S = 16383/16/63 independent of their size.
 130          * Some drives can be jumpered to use 15 heads instead of 16.
 131          * Some drives can be jumpered to use 4092 cyls instead of 16383.
 132          */
 133         if ((id->cyls == 16383
 134              || (id->cyls == 4092 && id->cur_cyls == 16383)) &&
 135             id->sectors == 63 &&
 136             (id->heads == 15 || id->heads == 16) &&
 137             (id->lba_capacity >= 16383*63*id->heads))
 138                 return 1;
 139
 140         lba_sects   = id->lba_capacity;
 141         chs_sects   = id->cyls * id->heads * id->sectors;
 142
 143         /* perform a rough sanity check on lba_sects:  within 10% is OK */
 144         if ((lba_sects - chs_sects) < chs_sects/10)
 145                 return 1;
 146
 147         /* some drives have the word order reversed */
 148         head = ((lba_sects >> 16) & 0xffff);
 149         tail = (lba_sects & 0xffff);
 150         lba_sects = (head | (tail << 16));
 151         if ((lba_sects - chs_sects) < chs_sects/10) {
 152                 id->lba_capacity = lba_sects;
 153                 return 1;       /* lba_capacity is (now) good */
 154         }
 155
 156         return 0;       /* lba_capacity value may be bad */
 157 }
 158
 159 /*
 160  * __ide_do_rw_disk() issues READ and WRITE commands to a disk,
 161  * using LBA if supported, or CHS otherwise, to address sectors.
 162  */
 163 static ide_startstop_t __ide_do_rw_disk(ide_drive_t *drive, struct request *rq, sector_t block)
 164 {
 165         ide_hwif_t *hwif        = HWIF(drive);
 166         unsigned int dma        = drive->using_dma;
 167         u8 lba48                = (drive->addressing == 1) ? 1 : 0;
 168         task_ioreg_t command    = WIN_NOP;
 169         ata_nsector_t           nsectors;
 170
 171         nsectors.all            = (u16) rq->nr_sectors;
 172
 173         if (hwif->no_lba48_dma && lba48 && dma) {
 174                 if (block + rq->nr_sectors > 1ULL << 28)
 175                         dma = 0;
 176                 else
 177                         lba48 = 0;
 178         }
 179
 180         if (!dma) {
 181                 ide_init_sg_cmd(drive, rq);
 182                 ide_map_sg(drive, rq);
 183         }
 184
 185         if (IDE_CONTROL_REG)
 186                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
 187
 188         /* FIXME: SELECT_MASK(drive, 0) ? */
 189
 190         if (drive->select.b.lba) {
 191                 if (lba48) {
 192                         task_ioreg_t tasklets[10];
 193
 194                         pr_debug("%s: LBA=0x%012llx\n", drive->name,
 195                                         (unsigned long long)block);
 196
 197                         tasklets[0] = 0;
 198                         tasklets[1] = 0;
 199                         tasklets[2] = nsectors.b.low;
 200                         tasklets[3] = nsectors.b.high;
 201                         tasklets[4] = (task_ioreg_t) block;
 202                         tasklets[5] = (task_ioreg_t) (block>>8);
 203                         tasklets[6] = (task_ioreg_t) (block>>16);
 204                         tasklets[7] = (task_ioreg_t) (block>>24);
 205                         if (sizeof(block) == 4) {
 206                                 tasklets[8] = (task_ioreg_t) 0;
 207                                 tasklets[9] = (task_ioreg_t) 0;
 208                         } else {
 209                                 tasklets[8] = (task_ioreg_t)((u64)block >> 32);
 210                                 tasklets[9] = (task_ioreg_t)((u64)block >> 40);
 211                         }
 212 #ifdef DEBUG
 213                         printk("%s: 0x%02x%02x 0x%02x%02x%02x%02x%02x%02x\n",
 214                                 drive->name, tasklets[3], tasklets[2],
 215                                 tasklets[9], tasklets[8], tasklets[7],
 216                                 tasklets[6], tasklets[5], tasklets[4]);
 217 #endif
 218                         hwif->OUTB(tasklets[1], IDE_FEATURE_REG);
 219                         hwif->OUTB(tasklets[3], IDE_NSECTOR_REG);
 220                         hwif->OUTB(tasklets[7], IDE_SECTOR_REG);
 221                         hwif->OUTB(tasklets[8], IDE_LCYL_REG);
 222                         hwif->OUTB(tasklets[9], IDE_HCYL_REG);
 223
 224                         hwif->OUTB(tasklets[0], IDE_FEATURE_REG);
 225                         hwif->OUTB(tasklets[2], IDE_NSECTOR_REG);
 226                         hwif->OUTB(tasklets[4], IDE_SECTOR_REG);
 227                         hwif->OUTB(tasklets[5], IDE_LCYL_REG);
 228                         hwif->OUTB(tasklets[6], IDE_HCYL_REG);
 229                         hwif->OUTB(0x00|drive->select.all,IDE_SELECT_REG);
 230                 } else {
 231                         hwif->OUTB(0x00, IDE_FEATURE_REG);
 232                         hwif->OUTB(nsectors.b.low, IDE_NSECTOR_REG);
 233                         hwif->OUTB(block, IDE_SECTOR_REG);
 234                         hwif->OUTB(block>>=8, IDE_LCYL_REG);
 235                         hwif->OUTB(block>>=8, IDE_HCYL_REG);
 236                         hwif->OUTB(((block>>8)&0x0f)|drive->select.all,IDE_SELECT_REG);
 237                 }
 238         } else {
 239                 unsigned int sect,head,cyl,track;
 240                 track = (int)block / drive->sect;
 241                 sect  = (int)block % drive->sect + 1;
 242                 hwif->OUTB(sect, IDE_SECTOR_REG);
 243                 head  = track % drive->head;
 244                 cyl   = track / drive->head;
 245
 246                 pr_debug("%s: CHS=%u/%u/%u\n", drive->name, cyl, head, sect);
 247
 248                 hwif->OUTB(0x00, IDE_FEATURE_REG);
 249                 hwif->OUTB(nsectors.b.low, IDE_NSECTOR_REG);
 250                 hwif->OUTB(cyl, IDE_LCYL_REG);
 251                 hwif->OUTB(cyl>>8, IDE_HCYL_REG);
 252                 hwif->OUTB(head|drive->select.all,IDE_SELECT_REG);
 253         }
 254
 255         if (dma) {
 256                 if (!hwif->dma_setup(drive)) {
 257                         if (rq_data_dir(rq)) {
 258                                 command = lba48 ? WIN_WRITEDMA_EXT : WIN_WRITEDMA;
 259                                 if (drive->vdma)
 260                                         command = lba48 ? WIN_WRITE_EXT: WIN_WRITE;
 261                         } else {
 262                                 command = lba48 ? WIN_READDMA_EXT : WIN_READDMA;
 263                                 if (drive->vdma)
 264                                         command = lba48 ? WIN_READ_EXT: WIN_READ;
 265                         }
 266                         hwif->dma_exec_cmd(drive, command);
 267                         hwif->dma_start(drive);
 268                         return ide_started;
 269                 }
 270                 /* fallback to PIO */
 271                 ide_init_sg_cmd(drive, rq);
 272         }
 273
 274         if (rq_data_dir(rq) == READ) {
 275
 276                 if (drive->mult_count) {
 277                         hwif->data_phase = TASKFILE_MULTI_IN;
 278                         command = lba48 ? WIN_MULTREAD_EXT : WIN_MULTREAD;
 279                 } else {
 280                         hwif->data_phase = TASKFILE_IN;
 281                         command = lba48 ? WIN_READ_EXT : WIN_READ;
 282                 }
 283
 284                 ide_execute_command(drive, command, &task_in_intr, WAIT_CMD, NULL);
 285                 return ide_started;
 286         } else {
 287                 if (drive->mult_count) {
 288                         hwif->data_phase = TASKFILE_MULTI_OUT;
 289                         command = lba48 ? WIN_MULTWRITE_EXT : WIN_MULTWRITE;
 290                 } else {
 291                         hwif->data_phase = TASKFILE_OUT;
 292                         command = lba48 ? WIN_WRITE_EXT : WIN_WRITE;
 293                 }
 294
 295                 /* FIXME: ->OUTBSYNC ? */
 296                 hwif->OUTB(command, IDE_COMMAND_REG);
 297
 298                 return pre_task_out_intr(drive, rq);
 299         }
 300 }
 301
 302 /*
 303  * 268435455  == 137439 MB or 28bit limit
 304  * 320173056  == 163929 MB or 48bit addressing
 305  * 1073741822 == 549756 MB or 48bit addressing fake drive
 306  */
 307
 308 static ide_startstop_t ide_do_rw_disk (ide_drive_t *drive, struct request *rq, sector_t block)
 309 {
 310         ide_hwif_t *hwif = HWIF(drive);
 311
 312         BUG_ON(drive->blocked);
 313
 314         if (!blk_fs_request(rq)) {
 315                 blk_dump_rq_flags(rq, "ide_do_rw_disk - bad command");
 316                 ide_end_request(drive, 0, 0);
 317                 return ide_stopped;
 318         }
 319
 320         ledtrig_ide_activity();
 321
 322         pr_debug("%s: %sing: block=%llu, sectors=%lu, buffer=0x%08lx\n",
 323                  drive->name, rq_data_dir(rq) == READ ? "read" : "writ",
 324                  (unsigned long long)block, rq->nr_sectors,
 325                  (unsigned long)rq->buffer);
 326
 327         if (hwif->rw_disk)
 328                 hwif->rw_disk(drive, rq);
 329
 330         return __ide_do_rw_disk(drive, rq, block);
 331 }
 332
 333 /*
 334  * Queries for true maximum capacity of the drive.
 335  * Returns maximum LBA address (> 0) of the drive, 0 if failed.
 336  */
 337 static unsigned long idedisk_read_native_max_address(ide_drive_t *drive)
 338 {
 339         ide_task_t args;
 340         unsigned long addr = 0;
 341
 342         /* Create IDE/ATA command request structure */
 343         memset(&args, 0, sizeof(ide_task_t));
 344         args.tfRegister[IDE_SELECT_OFFSET]      = 0x40;
 345         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_READ_NATIVE_MAX;
 346         args.command_type                       = IDE_DRIVE_TASK_NO_DATA;
 347         args.handler                            = &task_no_data_intr;
 348         /* submit command request */
 349         ide_raw_taskfile(drive, &args, NULL);
 350
 351         /* if OK, compute maximum address value */
 352         if ((args.tfRegister[IDE_STATUS_OFFSET] & 0x01) == 0) {
 353                 addr = ((args.tfRegister[IDE_SELECT_OFFSET] & 0x0f) << 24)
 354                      | ((args.tfRegister[  IDE_HCYL_OFFSET]       ) << 16)
 355                      | ((args.tfRegister[  IDE_LCYL_OFFSET]       ) <<  8)
 356                      | ((args.tfRegister[IDE_SECTOR_OFFSET]       ));
 357                 addr++; /* since the return value is (maxlba - 1), we add 1 */
 358         }
 359         return addr;
 360 }
 361
 362 static unsigned long long idedisk_read_native_max_address_ext(ide_drive_t *drive)
 363 {
 364         ide_task_t args;
 365         unsigned long long addr = 0;
 366
 367         /* Create IDE/ATA command request structure */
 368         memset(&args, 0, sizeof(ide_task_t));
 369
 370         args.tfRegister[IDE_SELECT_OFFSET]      = 0x40;
 371         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_READ_NATIVE_MAX_EXT;
 372         args.command_type                       = IDE_DRIVE_TASK_NO_DATA;
 373         args.handler                            = &task_no_data_intr;
 374         /* submit command request */
 375         ide_raw_taskfile(drive, &args, NULL);
 376
 377         /* if OK, compute maximum address value */
 378         if ((args.tfRegister[IDE_STATUS_OFFSET] & 0x01) == 0) {
 379                 u32 high = (args.hobRegister[IDE_HCYL_OFFSET] << 16) |
 380                            (args.hobRegister[IDE_LCYL_OFFSET] <<  8) |
 381                             args.hobRegister[IDE_SECTOR_OFFSET];
 382                 u32 low  = ((args.tfRegister[IDE_HCYL_OFFSET])<<16) |
 383                            ((args.tfRegister[IDE_LCYL_OFFSET])<<8) |
 384                             (args.tfRegister[IDE_SECTOR_OFFSET]);
 385                 addr = ((__u64)high << 24) | low;
 386                 addr++; /* since the return value is (maxlba - 1), we add 1 */
 387         }
 388         return addr;
 389 }
 390
 391 /*
 392  * Sets maximum virtual LBA address of the drive.
 393  * Returns new maximum virtual LBA address (> 0) or 0 on failure.
 394  */
 395 static unsigned long idedisk_set_max_address(ide_drive_t *drive, unsigned long addr_req)
 396 {
 397         ide_task_t args;
 398         unsigned long addr_set = 0;
 399
 400         addr_req--;
 401         /* Create IDE/ATA command request structure */
 402         memset(&args, 0, sizeof(ide_task_t));
 403         args.tfRegister[IDE_SECTOR_OFFSET]      = ((addr_req >>  0) & 0xff);
 404         args.tfRegister[IDE_LCYL_OFFSET]        = ((addr_req >>  8) & 0xff);
 405         args.tfRegister[IDE_HCYL_OFFSET]        = ((addr_req >> 16) & 0xff);
 406         args.tfRegister[IDE_SELECT_OFFSET]      = ((addr_req >> 24) & 0x0f) | 0x40;
 407         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SET_MAX;
 408         args.command_type                       = IDE_DRIVE_TASK_NO_DATA;
 409         args.handler                            = &task_no_data_intr;
 410         /* submit command request */
 411         ide_raw_taskfile(drive, &args, NULL);
 412         /* if OK, read new maximum address value */
 413         if ((args.tfRegister[IDE_STATUS_OFFSET] & 0x01) == 0) {
 414                 addr_set = ((args.tfRegister[IDE_SELECT_OFFSET] & 0x0f) << 24)
 415                          | ((args.tfRegister[  IDE_HCYL_OFFSET]       ) << 16)
 416                          | ((args.tfRegister[  IDE_LCYL_OFFSET]       ) <<  8)
 417                          | ((args.tfRegister[IDE_SECTOR_OFFSET]       ));
 418                 addr_set++;
 419         }
 420         return addr_set;
 421 }
 422
 423 static unsigned long long idedisk_set_max_address_ext(ide_drive_t *drive, unsigned long long addr_req)
 424 {
 425         ide_task_t args;
 426         unsigned long long addr_set = 0;
 427
 428         addr_req--;
 429         /* Create IDE/ATA command request structure */
 430         memset(&args, 0, sizeof(ide_task_t));
 431         args.tfRegister[IDE_SECTOR_OFFSET]      = ((addr_req >>  0) & 0xff);
 432         args.tfRegister[IDE_LCYL_OFFSET]        = ((addr_req >>= 8) & 0xff);
 433         args.tfRegister[IDE_HCYL_OFFSET]        = ((addr_req >>= 8) & 0xff);
 434         args.tfRegister[IDE_SELECT_OFFSET]      = 0x40;
 435         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SET_MAX_EXT;
 436         args.hobRegister[IDE_SECTOR_OFFSET]     = (addr_req >>= 8) & 0xff;
 437         args.hobRegister[IDE_LCYL_OFFSET]       = (addr_req >>= 8) & 0xff;
 438         args.hobRegister[IDE_HCYL_OFFSET]       = (addr_req >>= 8) & 0xff;
 439         args.hobRegister[IDE_SELECT_OFFSET]     = 0x40;
 440         args.hobRegister[IDE_CONTROL_OFFSET_HOB]= (drive->ctl|0x80);
 441         args.command_type                       = IDE_DRIVE_TASK_NO_DATA;
 442         args.handler                            = &task_no_data_intr;
 443         /* submit command request */
 444         ide_raw_taskfile(drive, &args, NULL);
 445         /* if OK, compute maximum address value */
 446         if ((args.tfRegister[IDE_STATUS_OFFSET] & 0x01) == 0) {
 447                 u32 high = (args.hobRegister[IDE_HCYL_OFFSET] << 16) |
 448                            (args.hobRegister[IDE_LCYL_OFFSET] <<  8) |
 449                             args.hobRegister[IDE_SECTOR_OFFSET];
 450                 u32 low  = ((args.tfRegister[IDE_HCYL_OFFSET])<<16) |
 451                            ((args.tfRegister[IDE_LCYL_OFFSET])<<8) |
 452                             (args.tfRegister[IDE_SECTOR_OFFSET]);
 453                 addr_set = ((__u64)high << 24) | low;
 454                 addr_set++;
 455         }
 456         return addr_set;
 457 }
 458
 459 static unsigned long long sectors_to_MB(unsigned long long n)
 460 {
 461         n <<= 9;                /* make it bytes */
 462         do_div(n, 1000000);     /* make it MB */
 463         return n;
 464 }
 465
 466 /*
 467  * Bits 10 of command_set_1 and cfs_enable_1 must be equal,
 468  * so on non-buggy drives we need test only one.
 469  * However, we should also check whether these fields are valid.
 470  */
 471 static inline int idedisk_supports_hpa(const struct hd_driveid *id)
 472 {
 473         return (id->command_set_1 & 0x0400) && (id->cfs_enable_1 & 0x0400);
 474 }
 475
 476 /*
 477  * The same here.
 478  */
 479 static inline int idedisk_supports_lba48(const struct hd_driveid *id)
 480 {
 481         return (id->command_set_2 & 0x0400) && (id->cfs_enable_2 & 0x0400)
 482                && id->lba_capacity_2;
 483 }
 484
 485 static void idedisk_check_hpa(ide_drive_t *drive)
 486 {
 487         unsigned long long capacity, set_max;
 488         int lba48 = idedisk_supports_lba48(drive->id);
 489
 490         capacity = drive->capacity64;
 491         if (lba48)
 492                 set_max = idedisk_read_native_max_address_ext(drive);
 493         else
 494                 set_max = idedisk_read_native_max_address(drive);
 495
 496         if (set_max <= capacity)
 497                 return;
 498
 499         printk(KERN_INFO "%s: Host Protected Area detected.\n"
 500                          "\tcurrent capacity is %llu sectors (%llu MB)\n"
 501                          "\tnative  capacity is %llu sectors (%llu MB)\n",
 502                          drive->name,
 503                          capacity, sectors_to_MB(capacity),
 504                          set_max, sectors_to_MB(set_max));
 505
 506         if (lba48)
 507                 set_max = idedisk_set_max_address_ext(drive, set_max);
 508         else
 509                 set_max = idedisk_set_max_address(drive, set_max);
 510         if (set_max) {
 511                 drive->capacity64 = set_max;
 512                 printk(KERN_INFO "%s: Host Protected Area disabled.\n",
 513                                  drive->name);
 514         }
 515 }
 516
 517 /*
 518  * Compute drive->capacity, the full capacity of the drive
 519  * Called with drive->id != NULL.
 520  *
 521  * To compute capacity, this uses either of
 522  *
 523  *    1. CHS value set by user       (whatever user sets will be trusted)
 524  *    2. LBA value from target drive (require new ATA feature)
 525  *    3. LBA value from system BIOS  (new one is OK, old one may break)
 526  *    4. CHS value from system BIOS  (traditional style)
 527  *
 528  * in above order (i.e., if value of higher priority is available,
 529  * reset will be ignored).
 530  */
 531 static void init_idedisk_capacity (ide_drive_t  *drive)
 532 {
 533         struct hd_driveid *id = drive->id;
 534         /*
 535          * If this drive supports the Host Protected Area feature set,
 536          * then we may need to change our opinion about the drive's capacity.
 537          */
 538         int hpa = idedisk_supports_hpa(id);
 539
 540         if (idedisk_supports_lba48(id)) {
 541                 /* drive speaks 48-bit LBA */
 542                 drive->select.b.lba = 1;
 543                 drive->capacity64 = id->lba_capacity_2;
 544                 if (hpa)
 545                         idedisk_check_hpa(drive);
 546         } else if ((id->capability & 2) && lba_capacity_is_ok(id)) {
 547                 /* drive speaks 28-bit LBA */
 548                 drive->select.b.lba = 1;
 549                 drive->capacity64 = id->lba_capacity;
 550                 if (hpa)
 551                         idedisk_check_hpa(drive);
 552         } else {
 553                 /* drive speaks boring old 28-bit CHS */
 554                 drive->capacity64 = drive->cyl * drive->head * drive->sect;
 555         }
 556 }
 557
 558 static sector_t idedisk_capacity (ide_drive_t *drive)
 559 {
 560         return drive->capacity64 - drive->sect0;
 561 }
 562
 563 #ifdef CONFIG_PROC_FS
 564
 565 static int smart_enable(ide_drive_t *drive)
 566 {
 567         ide_task_t args;
 568
 569         memset(&args, 0, sizeof(ide_task_t));
 570         args.tfRegister[IDE_FEATURE_OFFSET]     = SMART_ENABLE;
 571         args.tfRegister[IDE_LCYL_OFFSET]        = SMART_LCYL_PASS;
 572         args.tfRegister[IDE_HCYL_OFFSET]        = SMART_HCYL_PASS;
 573         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SMART;
 574         args.command_type                       = IDE_DRIVE_TASK_NO_DATA;
 575         args.handler                            = &task_no_data_intr;
 576         return ide_raw_taskfile(drive, &args, NULL);
 577 }
 578
 579 static int get_smart_values(ide_drive_t *drive, u8 *buf)
 580 {
 581         ide_task_t args;
 582
 583         memset(&args, 0, sizeof(ide_task_t));
 584         args.tfRegister[IDE_FEATURE_OFFSET]     = SMART_READ_VALUES;
 585         args.tfRegister[IDE_NSECTOR_OFFSET]     = 0x01;
 586         args.tfRegister[IDE_LCYL_OFFSET]        = SMART_LCYL_PASS;
 587         args.tfRegister[IDE_HCYL_OFFSET]        = SMART_HCYL_PASS;
 588         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SMART;
 589         args.command_type                       = IDE_DRIVE_TASK_IN;
 590         args.data_phase                         = TASKFILE_IN;
 591         args.handler                            = &task_in_intr;
 592         (void) smart_enable(drive);
 593         return ide_raw_taskfile(drive, &args, buf);
 594 }
 595
 596 static int get_smart_thresholds(ide_drive_t *drive, u8 *buf)
 597 {
 598         ide_task_t args;
 599         memset(&args, 0, sizeof(ide_task_t));
 600         args.tfRegister[IDE_FEATURE_OFFSET]     = SMART_READ_THRESHOLDS;
 601         args.tfRegister[IDE_NSECTOR_OFFSET]     = 0x01;
 602         args.tfRegister[IDE_LCYL_OFFSET]        = SMART_LCYL_PASS;
 603         args.tfRegister[IDE_HCYL_OFFSET]        = SMART_HCYL_PASS;
 604         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SMART;
 605         args.command_type                       = IDE_DRIVE_TASK_IN;
 606         args.data_phase                         = TASKFILE_IN;
 607         args.handler                            = &task_in_intr;
 608         (void) smart_enable(drive);
 609         return ide_raw_taskfile(drive, &args, buf);
 610 }
 611
 612 static int proc_idedisk_read_cache
 613         (char *page, char **start, off_t off, int count, int *eof, void *data)
 614 {
 615         ide_drive_t     *drive = (ide_drive_t *) data;
 616         char            *out = page;
 617         int             len;
 618
 619         if (drive->id_read)
 620                 len = sprintf(out,"%i\n", drive->id->buf_size / 2);
 621         else
 622                 len = sprintf(out,"(none)\n");
 623         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 624 }
 625
 626 static int proc_idedisk_read_capacity
 627         (char *page, char **start, off_t off, int count, int *eof, void *data)
 628 {
 629         ide_drive_t*drive = (ide_drive_t *)data;
 630         int len;
 631
 632         len = sprintf(page,"%llu\n", (long long)idedisk_capacity(drive));
 633         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 634 }
 635
 636 static int proc_idedisk_read_smart_thresholds
 637         (char *page, char **start, off_t off, int count, int *eof, void *data)
 638 {
 639         ide_drive_t     *drive = (ide_drive_t *)data;
 640         int             len = 0, i = 0;
 641
 642         if (!get_smart_thresholds(drive, page)) {
 643                 unsigned short *val = (unsigned short *) page;
 644                 char *out = ((char *)val) + (SECTOR_WORDS * 4);
 645                 page = out;
 646                 do {
 647                         out += sprintf(out, "%04x%c", le16_to_cpu(*val), (++i & 7) ? ' ' : '\n');
 648                         val += 1;
 649                 } while (i < (SECTOR_WORDS * 2));
 650                 len = out - page;
 651         }
 652         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 653 }
 654
 655 static int proc_idedisk_read_smart_values
 656         (char *page, char **start, off_t off, int count, int *eof, void *data)
 657 {
 658         ide_drive_t     *drive = (ide_drive_t *)data;
 659         int             len = 0, i = 0;
 660
 661         if (!get_smart_values(drive, page)) {
 662                 unsigned short *val = (unsigned short *) page;
 663                 char *out = ((char *)val) + (SECTOR_WORDS * 4);
 664                 page = out;
 665                 do {
 666                         out += sprintf(out, "%04x%c", le16_to_cpu(*val), (++i & 7) ? ' ' : '\n');
 667                         val += 1;
 668                 } while (i < (SECTOR_WORDS * 2));
 669                 len = out - page;
 670         }
 671         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 672 }
 673
 674 static ide_proc_entry_t idedisk_proc[] = {
 675         { "cache",              S_IFREG|S_IRUGO,        proc_idedisk_read_cache,                NULL },
 676         { "capacity",           S_IFREG|S_IRUGO,        proc_idedisk_read_capacity,             NULL },
 677         { "geometry",           S_IFREG|S_IRUGO,        proc_ide_read_geometry,                 NULL },
 678         { "smart_values",       S_IFREG|S_IRUSR,        proc_idedisk_read_smart_values,         NULL },
 679         { "smart_thresholds",   S_IFREG|S_IRUSR,        proc_idedisk_read_smart_thresholds,     NULL },
 680         { NULL, 0, NULL, NULL }
 681 };
 682
 683 #else
 684
 685 #define idedisk_proc    NULL
 686
 687 #endif  /* CONFIG_PROC_FS */
 688
 689 static void idedisk_prepare_flush(request_queue_t *q, struct request *rq)
 690 {
 691         ide_drive_t *drive = q->queuedata;
 692
 693         memset(rq->cmd, 0, sizeof(rq->cmd));
 694
 695         if (ide_id_has_flush_cache_ext(drive->id) &&
 696             (drive->capacity64 >= (1UL << 28)))
 697                 rq->cmd[0] = WIN_FLUSH_CACHE_EXT;
 698         else
 699                 rq->cmd[0] = WIN_FLUSH_CACHE;
 700
 701
 702         rq->flags |= REQ_DRIVE_TASK;
 703         rq->buffer = rq->cmd;
 704 }
 705
 706 static int idedisk_issue_flush(request_queue_t *q, struct gendisk *disk,
 707                                sector_t *error_sector)
 708 {
 709         ide_drive_t *drive = q->queuedata;
 710         struct request *rq;
 711         int ret;
 712
 713         if (!drive->wcache)
 714                 return 0;
 715
 716         rq = blk_get_request(q, WRITE, __GFP_WAIT);
 717
 718         idedisk_prepare_flush(q, rq);
 719
 720         ret = blk_execute_rq(q, disk, rq, 0);
 721
 722         /*
 723          * if we failed and caller wants error offset, get it
 724          */
 725         if (ret && error_sector)
 726                 *error_sector = ide_get_error_location(drive, rq->cmd);
 727
 728         blk_put_request(rq);
 729         return ret;
 730 }
 731
 732 /*
 733  * This is tightly woven into the driver->do_special can not touch.
 734  * DON'T do it again until a total personality rewrite is committed.
 735  */
 736 static int set_multcount(ide_drive_t *drive, int arg)
 737 {
 738         struct request rq;
 739
 740         if (drive->special.b.set_multmode)
 741                 return -EBUSY;
 742         ide_init_drive_cmd (&rq);
 743         rq.flags = REQ_DRIVE_CMD;
 744         drive->mult_req = arg;
 745         drive->special.b.set_multmode = 1;
 746         (void) ide_do_drive_cmd (drive, &rq, ide_wait);
 747         return (drive->mult_count == arg) ? 0 : -EIO;
 748 }
 749
 750 static int set_nowerr(ide_drive_t *drive, int arg)
 751 {
 752         if (ide_spin_wait_hwgroup(drive))
 753                 return -EBUSY;
 754         drive->nowerr = arg;
 755         drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;
 756         spin_unlock_irq(&ide_lock);
 757         return 0;
 758 }
 759
 760 static void update_ordered(ide_drive_t *drive)
 761 {
 762         struct hd_driveid *id = drive->id;
 763         unsigned ordered = QUEUE_ORDERED_NONE;
 764         prepare_flush_fn *prep_fn = NULL;
 765         issue_flush_fn *issue_fn = NULL;
 766
 767         if (drive->wcache) {
 768                 unsigned long long capacity;
 769                 int barrier;
 770                 /*
 771                  * We must avoid issuing commands a drive does not
 772                  * understand or we may crash it. We check flush cache
 773                  * is supported. We also check we have the LBA48 flush
 774                  * cache if the drive capacity is too large. By this
 775                  * time we have trimmed the drive capacity if LBA48 is
 776                  * not available so we don't need to recheck that.
 777                  */
 778                 capacity = idedisk_capacity(drive);
 779                 barrier = ide_id_has_flush_cache(id) &&
 780                         (drive->addressing == 0 || capacity <= (1ULL << 28) ||
 781                          ide_id_has_flush_cache_ext(id));
 782
 783                 printk(KERN_INFO "%s: cache flushes %ssupported\n",
 784                        drive->name, barrier ? "" : "not ");
 785
 786                 if (barrier) {
 787                         ordered = QUEUE_ORDERED_DRAIN_FLUSH;
 788                         prep_fn = idedisk_prepare_flush;
 789                         issue_fn = idedisk_issue_flush;
 790                 }
 791         } else
 792                 ordered = QUEUE_ORDERED_DRAIN;
 793
 794         blk_queue_ordered(drive->queue, ordered, prep_fn);
 795         blk_queue_issue_flush_fn(drive->queue, issue_fn);
 796 }
 797
 798 static int write_cache(ide_drive_t *drive, int arg)
 799 {
 800         ide_task_t args;
 801         int err = 1;
 802
 803         if (ide_id_has_flush_cache(drive->id)) {
 804                 memset(&args, 0, sizeof(ide_task_t));
 805                 args.tfRegister[IDE_FEATURE_OFFSET]     = (arg) ?
 806                         SETFEATURES_EN_WCACHE : SETFEATURES_DIS_WCACHE;
 807                 args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SETFEATURES;
 808                 args.command_type               = IDE_DRIVE_TASK_NO_DATA;
 809                 args.handler                    = &task_no_data_intr;
 810                 err = ide_raw_taskfile(drive, &args, NULL);
 811                 if (err == 0)
 812                         drive->wcache = arg;
 813         }
 814
 815         update_ordered(drive);
 816
 817         return err;
 818 }
 819
 820 static int do_idedisk_flushcache (ide_drive_t *drive)
 821 {
 822         ide_task_t args;
 823
 824         memset(&args, 0, sizeof(ide_task_t));
 825         if (ide_id_has_flush_cache_ext(drive->id))
 826                 args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_FLUSH_CACHE_EXT;
 827         else
 828                 args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_FLUSH_CACHE;
 829         args.command_type                       = IDE_DRIVE_TASK_NO_DATA;
 830         args.handler                            = &task_no_data_intr;
 831         return ide_raw_taskfile(drive, &args, NULL);
 832 }
 833
 834 static int set_acoustic (ide_drive_t *drive, int arg)
 835 {
 836         ide_task_t args;
 837
 838         memset(&args, 0, sizeof(ide_task_t));
 839         args.tfRegister[IDE_FEATURE_OFFSET]     = (arg) ? SETFEATURES_EN_AAM :
 840                                                           SETFEATURES_DIS_AAM;
 841         args.tfRegister[IDE_NSECTOR_OFFSET]     = arg;
 842         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SETFEATURES;
 843         args.command_type = IDE_DRIVE_TASK_NO_DATA;
 844         args.handler      = &task_no_data_intr;
 845         ide_raw_taskfile(drive, &args, NULL);
 846         drive->acoustic = arg;
 847         return 0;
 848 }
 849
 850 /*
 851  * drive->addressing:
 852  *      0: 28-bit
 853  *      1: 48-bit
 854  *      2: 48-bit capable doing 28-bit
 855  */
 856 static int set_lba_addressing(ide_drive_t *drive, int arg)
 857 {
 858         drive->addressing =  0;
 859
 860         if (HWIF(drive)->no_lba48)
 861                 return 0;
 862
 863         if (!idedisk_supports_lba48(drive->id))
 864                 return -EIO;
 865         drive->addressing = arg;
 866         return 0;
 867 }
 868
 869 static void idedisk_add_settings(ide_drive_t *drive)
 870 {
 871         struct hd_driveid *id = drive->id;
 872
 873         ide_add_setting(drive,  "bios_cyl",             SETTING_RW,                                     -1,                     -1,                     TYPE_INT,       0,      65535,                          1,      1,      &drive->bios_cyl,               NULL);
 874         ide_add_setting(drive,  "bios_head",            SETTING_RW,                                     -1,                     -1,                     TYPE_BYTE,      0,      255,                            1,      1,      &drive->bios_head,              NULL);
 875         ide_add_setting(drive,  "bios_sect",            SETTING_RW,                                     -1,                     -1,                     TYPE_BYTE,      0,      63,                             1,      1,      &drive->bios_sect,              NULL);
 876         ide_add_setting(drive,  "address",              SETTING_RW,                                     HDIO_GET_ADDRESS,       HDIO_SET_ADDRESS,       TYPE_INTA,      0,      2,                              1,      1,      &drive->addressing,     set_lba_addressing);
 877         ide_add_setting(drive,  "bswap",                SETTING_READ,                                   -1,                     -1,                     TYPE_BYTE,      0,      1,                              1,      1,      &drive->bswap,                  NULL);
 878         ide_add_setting(drive,  "multcount",            id ? SETTING_RW : SETTING_READ,                 HDIO_GET_MULTCOUNT,     HDIO_SET_MULTCOUNT,     TYPE_BYTE,      0,      id ? id->max_multsect : 0,      1,      1,      &drive->mult_count,             set_multcount);
 879         ide_add_setting(drive,  "nowerr",               SETTING_RW,                                     HDIO_GET_NOWERR,        HDIO_SET_NOWERR,        TYPE_BYTE,      0,      1,                              1,      1,      &drive->nowerr,                 set_nowerr);
 880         ide_add_setting(drive,  "lun",                  SETTING_RW,                                     -1,                     -1,                     TYPE_INT,       0,      7,                              1,      1,      &drive->lun,                    NULL);
 881         ide_add_setting(drive,  "wcache",               SETTING_RW,                                     HDIO_GET_WCACHE,        HDIO_SET_WCACHE,        TYPE_BYTE,      0,      1,                              1,      1,      &drive->wcache,                 write_cache);
 882         ide_add_setting(drive,  "acoustic",             SETTING_RW,                                     HDIO_GET_ACOUSTIC,      HDIO_SET_ACOUSTIC,      TYPE_BYTE,      0,      254,                            1,      1,      &drive->acoustic,               set_acoustic);
 883         ide_add_setting(drive,  "failures",             SETTING_RW,                                     -1,                     -1,                     TYPE_INT,       0,      65535,                          1,      1,      &drive->failures,               NULL);
 884         ide_add_setting(drive,  "max_failures",         SETTING_RW,                                     -1,                     -1,                     TYPE_INT,       0,      65535,                          1,      1,      &drive->max_failures,           NULL);
 885 }
 886
 887 static void idedisk_setup (ide_drive_t *drive)
 888 {
 889         struct hd_driveid *id = drive->id;
 890         unsigned long long capacity;
 891
 892         idedisk_add_settings(drive);
 893
 894         if (drive->id_read == 0)
 895                 return;
 896
 897         if (drive->removable) {
 898                 /*
 899                  * Removable disks (eg. SYQUEST); ignore 'WD' drives
 900                  */
 901                 if (id->model[0] != 'W' || id->model[1] != 'D') {
 902                         drive->doorlocking = 1;
 903                 }
 904         }
 905
 906         (void)set_lba_addressing(drive, 1);
 907
 908         if (drive->addressing == 1) {
 909                 ide_hwif_t *hwif = HWIF(drive);
 910                 int max_s = 2048;
 911
 912                 if (max_s > hwif->rqsize)
 913                         max_s = hwif->rqsize;
 914
 915                 blk_queue_max_sectors(drive->queue, max_s);
 916         }
 917
 918         printk(KERN_INFO "%s: max request size: %dKiB\n", drive->name, drive->queue->max_sectors / 2);
 919
 920         /* calculate drive capacity, and select LBA if possible */
 921         init_idedisk_capacity (drive);
 922
 923         /* limit drive capacity to 137GB if LBA48 cannot be used */
 924         if (drive->addressing == 0 && drive->capacity64 > 1ULL << 28) {
 925                 printk(KERN_WARNING "%s: cannot use LBA48 - full capacity "
 926                        "%llu sectors (%llu MB)\n",
 927                        drive->name, (unsigned long long)drive->capacity64,
 928                        sectors_to_MB(drive->capacity64));
 929                 drive->capacity64 = 1ULL << 28;
 930         }
 931
 932         if (drive->hwif->no_lba48_dma && drive->addressing) {
 933                 if (drive->capacity64 > 1ULL << 28) {
 934                         printk(KERN_INFO "%s: cannot use LBA48 DMA - PIO mode will"
 935                                          " be used for accessing sectors > %u\n",
 936                                          drive->name, 1 << 28);
 937                 } else
 938                         drive->addressing = 0;
 939         }
 940
 941         /*
 942          * if possible, give fdisk access to more of the drive,
 943          * by correcting bios_cyls:
 944          */
 945         capacity = idedisk_capacity (drive);
 946         if (!drive->forced_geom) {
 947
 948                 if (idedisk_supports_lba48(drive->id)) {
 949                         /* compatibility */
 950                         drive->bios_sect = 63;
 951                         drive->bios_head = 255;
 952                 }
 953
 954                 if (drive->bios_sect && drive->bios_head) {
 955                         unsigned int cap0 = capacity; /* truncate to 32 bits */
 956                         unsigned int cylsz, cyl;
 957
 958                         if (cap0 != capacity)
 959                                 drive->bios_cyl = 65535;
 960                         else {
 961                                 cylsz = drive->bios_sect * drive->bios_head;
 962                                 cyl = cap0 / cylsz;
 963                                 if (cyl > 65535)
 964                                         cyl = 65535;
 965                                 if (cyl > drive->bios_cyl)
 966                                         drive->bios_cyl = cyl;
 967                         }
 968                 }
 969         }
 970         printk(KERN_INFO "%s: %llu sectors (%llu MB)",
 971                          drive->name, capacity, sectors_to_MB(capacity));
 972
 973         /* Only print cache size when it was specified */
 974         if (id->buf_size)
 975                 printk (" w/%dKiB Cache", id->buf_size/2);
 976
 977         printk(", CHS=%d/%d/%d",
 978                drive->bios_cyl, drive->bios_head, drive->bios_sect);
 979         if (drive->using_dma)
 980                 ide_dma_verbose(drive);
 981         printk("\n");
 982
 983         /* write cache enabled? */
 984         if ((id->csfo & 1) || (id->cfs_enable_1 & (1 << 5)))
 985                 drive->wcache = 1;
 986
 987         write_cache(drive, 1);
 988 }
 989
 990 static void ide_cacheflush_p(ide_drive_t *drive)
 991 {
 992         if (!drive->wcache || !ide_id_has_flush_cache(drive->id))
 993                 return;
 994
 995         if (do_idedisk_flushcache(drive))
 996                 printk(KERN_INFO "%s: wcache flush failed!\n", drive->name);
 997 }
 998
 999 static void ide_disk_remove(ide_drive_t *drive)
1000 {
1001         struct ide_disk_obj *idkp = drive->driver_data;
1002         struct gendisk *g = idkp->disk;
1003
1004         ide_unregister_subdriver(drive, idkp->driver);
1005
1006         del_gendisk(g);
1007
1008         ide_cacheflush_p(drive);
1009
1010         ide_disk_put(idkp);
1011 }
1012
1013 static void ide_disk_release(struct kref *kref)
1014 {
1015         struct ide_disk_obj *idkp = to_ide_disk(kref);
1016         ide_drive_t *drive = idkp->drive;
1017         struct gendisk *g = idkp->disk;
1018
1019         drive->driver_data = NULL;
1020         g->private_data = NULL;
1021         put_disk(g);
1022         kfree(idkp);
1023 }
1024
1025 static int ide_disk_probe(ide_drive_t *drive);
1026
1027 static void ide_device_shutdown(ide_drive_t *drive)
1028 {
1029 #ifdef  CONFIG_ALPHA
1030         /* On Alpha, halt(8) doesn't actually turn the machine off,
1031            it puts you into the sort of firmware monitor. Typically,
1032            it's used to boot another kernel image, so it's not much
1033            different from reboot(8). Therefore, we don't need to
1034            spin down the disk in this case, especially since Alpha
1035            firmware doesn't handle disks in standby mode properly.
1036            On the other hand, it's reasonably safe to turn the power
1037            off when the shutdown process reaches the firmware prompt,
1038            as the firmware initialization takes rather long time -
1039            at least 10 seconds, which should be sufficient for
1040            the disk to expire its write cache. */
1041         if (system_state != SYSTEM_POWER_OFF) {
1042 #else
1043         if (system_state == SYSTEM_RESTART) {
1044 #endif
1045                 ide_cacheflush_p(drive);
1046                 return;
1047         }
1048
1049         printk("Shutdown: %s\n", drive->name);
1050         drive->gendev.bus->suspend(&drive->gendev, PMSG_SUSPEND);
1051 }
1052
1053 static ide_driver_t idedisk_driver = {
1054         .gen_driver = {
1055                 .owner          = THIS_MODULE,
1056                 .name           = "ide-disk",
1057                 .bus            = &ide_bus_type,
1058         },
1059         .probe                  = ide_disk_probe,
1060         .remove                 = ide_disk_remove,
1061         .shutdown               = ide_device_shutdown,
1062         .version                = IDEDISK_VERSION,
1063         .media                  = ide_disk,
1064         .supports_dsc_overlap   = 0,
1065         .do_request             = ide_do_rw_disk,
1066         .end_request            = ide_end_request,
1067         .error                  = __ide_error,
1068         .abort                  = __ide_abort,
1069         .proc                   = idedisk_proc,
1070 };
1071
1072 static int idedisk_open(struct inode *inode, struct file *filp)
1073 {
1074         struct gendisk *disk = inode->i_bdev->bd_disk;
1075         struct ide_disk_obj *idkp;
1076         ide_drive_t *drive;
1077
1078         if (!(idkp = ide_disk_get(disk)))
1079                 return -ENXIO;
1080
1081         drive = idkp->drive;
1082
1083         drive->usage++;
1084         if (drive->removable && drive->usage == 1) {
1085                 ide_task_t args;
1086                 memset(&args, 0, sizeof(ide_task_t));
1087                 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_DOORLOCK;
1088                 args.command_type = IDE_DRIVE_TASK_NO_DATA;
1089                 args.handler      = &task_no_data_intr;
1090                 check_disk_change(inode->i_bdev);
1091                 /*
1092                  * Ignore the return code from door_lock,
1093                  * since the open() has already succeeded,
1094                  * and the door_lock is irrelevant at this point.
1095                  */
1096                 if (drive->doorlocking && ide_raw_taskfile(drive, &args, NULL))
1097                         drive->doorlocking = 0;
1098         }
1099         return 0;
1100 }
1101
1102 static int idedisk_release(struct inode *inode, struct file *filp)
1103 {
1104         struct gendisk *disk = inode->i_bdev->bd_disk;
1105         struct ide_disk_obj *idkp = ide_disk_g(disk);
1106         ide_drive_t *drive = idkp->drive;
1107
1108         if (drive->usage == 1)
1109                 ide_cacheflush_p(drive);
1110         if (drive->removable && drive->usage == 1) {
1111                 ide_task_t args;
1112                 memset(&args, 0, sizeof(ide_task_t));
1113                 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_DOORUNLOCK;
1114                 args.command_type = IDE_DRIVE_TASK_NO_DATA;
1115                 args.handler      = &task_no_data_intr;
1116                 if (drive->doorlocking && ide_raw_taskfile(drive, &args, NULL))
1117                         drive->doorlocking = 0;
1118         }
1119         drive->usage--;
1120
1121         ide_disk_put(idkp);
1122
1123         return 0;
1124 }
1125
1126 static int idedisk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1127 {
1128         struct ide_disk_obj *idkp = ide_disk_g(bdev->bd_disk);
1129         ide_drive_t *drive = idkp->drive;
1130
1131         geo->heads = drive->bios_head;
1132         geo->sectors = drive->bios_sect;
1133         geo->cylinders = (u16)drive->bios_cyl; /* truncate */
1134         return 0;
1135 }
1136
1137 static int idedisk_ioctl(struct inode *inode, struct file *file,
1138                         unsigned int cmd, unsigned long arg)
1139 {
1140         struct block_device *bdev = inode->i_bdev;
1141         struct ide_disk_obj *idkp = ide_disk_g(bdev->bd_disk);
1142         return generic_ide_ioctl(idkp->drive, file, bdev, cmd, arg);
1143 }
1144
1145 static int idedisk_media_changed(struct gendisk *disk)
1146 {
1147         struct ide_disk_obj *idkp = ide_disk_g(disk);
1148         ide_drive_t *drive = idkp->drive;
1149
1150         /* do not scan partitions twice if this is a removable device */
1151         if (drive->attach) {
1152                 drive->attach = 0;
1153                 return 0;
1154         }
1155         /* if removable, always assume it was changed */
1156         return drive->removable;
1157 }
1158
1159 static int idedisk_revalidate_disk(struct gendisk *disk)
1160 {
1161         struct ide_disk_obj *idkp = ide_disk_g(disk);
1162         set_capacity(disk, idedisk_capacity(idkp->drive));
1163         return 0;
1164 }
1165
1166 static struct block_device_operations idedisk_ops = {
1167         .owner          = THIS_MODULE,
1168         .open           = idedisk_open,
1169         .release        = idedisk_release,
1170         .ioctl          = idedisk_ioctl,
1171         .getgeo         = idedisk_getgeo,
1172         .media_changed  = idedisk_media_changed,
1173         .revalidate_disk= idedisk_revalidate_disk
1174 };
1175
1176 MODULE_DESCRIPTION("ATA DISK Driver");
1177
1178 static int ide_disk_probe(ide_drive_t *drive)
1179 {
1180         struct ide_disk_obj *idkp;
1181         struct gendisk *g;
1182
1183         /* strstr("foo", "") is non-NULL */
1184         if (!strstr("ide-disk", drive->driver_req))
1185                 goto failed;
1186         if (!drive->present)
1187                 goto failed;
1188         if (drive->media != ide_disk)
1189                 goto failed;
1190
1191         idkp = kzalloc(sizeof(*idkp), GFP_KERNEL);
1192         if (!idkp)
1193                 goto failed;
1194
1195         g = alloc_disk_node(1 << PARTN_BITS,
1196                         hwif_to_node(drive->hwif));
1197         if (!g)
1198                 goto out_free_idkp;
1199
1200         ide_init_disk(g, drive);
1201
1202         ide_register_subdriver(drive, &idedisk_driver);
1203
1204         kref_init(&idkp->kref);
1205
1206         idkp->drive = drive;
1207         idkp->driver = &idedisk_driver;
1208         idkp->disk = g;
1209
1210         g->private_data = &idkp->driver;
1211
1212         drive->driver_data = idkp;
1213
1214         idedisk_setup(drive);
1215         if ((!drive->head || drive->head > 16) && !drive->select.b.lba) {
1216                 printk(KERN_ERR "%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
1217                         drive->name, drive->head);
1218                 drive->attach = 0;
1219         } else
1220                 drive->attach = 1;
1221
1222         g->minors = 1 << PARTN_BITS;
1223         g->driverfs_dev = &drive->gendev;
1224         g->flags = drive->removable ? GENHD_FL_REMOVABLE : 0;
1225         set_capacity(g, idedisk_capacity(drive));
1226         g->fops = &idedisk_ops;
1227         add_disk(g);
1228         return 0;
1229
1230 out_free_idkp:
1231         kfree(idkp);
1232 failed:
1233         return -ENODEV;
1234 }
1235
1236 static void __exit idedisk_exit (void)
1237 {
1238         driver_unregister(&idedisk_driver.gen_driver);
1239 }
1240
1241 static int __init idedisk_init(void)
1242 {
1243         return driver_register(&idedisk_driver.gen_driver);
1244 }
1245
1246 MODULE_ALIAS("ide:*m-disk*");
1247 module_init(idedisk_init);
1248 module_exit(idedisk_exit);
1249 MODULE_LICENSE("GPL");