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   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 //#define DEBUG
  47
  48 #include <linux/module.h>
  49 #include <linux/types.h>
  50 #include <linux/string.h>
  51 #include <linux/kernel.h>
  52 #include <linux/timer.h>
  53 #include <linux/mm.h>
  54 #include <linux/interrupt.h>
  55 #include <linux/major.h>
  56 #include <linux/errno.h>
  57 #include <linux/genhd.h>
  58 #include <linux/slab.h>
  59 #include <linux/delay.h>
  60 #include <linux/mutex.h>
  61 #include <linux/leds.h>
  62
  63 #define _IDE_DISK
  64
  65 #include <linux/ide.h>
  66
  67 #include <asm/byteorder.h>
  68 #include <asm/irq.h>
  69 #include <asm/uaccess.h>
  70 #include <asm/io.h>
  71 #include <asm/div64.h>
  72
  73 struct ide_disk_obj {
  74         ide_drive_t     *drive;
  75         ide_driver_t    *driver;
  76         struct gendisk  *disk;
  77         struct kref     kref;
  78         unsigned int    openers;        /* protected by BKL for now */
  79 };
  80
  81 static DEFINE_MUTEX(idedisk_ref_mutex);
  82
  83 #define to_ide_disk(obj) container_of(obj, struct ide_disk_obj, kref)
  84
  85 #define ide_disk_g(disk) \
  86         container_of((disk)->private_data, struct ide_disk_obj, driver)
  87
  88 static struct ide_disk_obj *ide_disk_get(struct gendisk *disk)
  89 {
  90         struct ide_disk_obj *idkp = NULL;
  91
  92         mutex_lock(&idedisk_ref_mutex);
  93         idkp = ide_disk_g(disk);
  94         if (idkp)
  95                 kref_get(&idkp->kref);
  96         mutex_unlock(&idedisk_ref_mutex);
  97         return idkp;
  98 }
  99
 100 static void ide_disk_release(struct kref *);
 101
 102 static void ide_disk_put(struct ide_disk_obj *idkp)
 103 {
 104         mutex_lock(&idedisk_ref_mutex);
 105         kref_put(&idkp->kref, ide_disk_release);
 106         mutex_unlock(&idedisk_ref_mutex);
 107 }
 108
 109 /*
 110  * lba_capacity_is_ok() performs a sanity check on the claimed "lba_capacity"
 111  * value for this drive (from its reported identification information).
 112  *
 113  * Returns:     1 if lba_capacity looks sensible
 114  *              0 otherwise
 115  *
 116  * It is called only once for each drive.
 117  */
 118 static int lba_capacity_is_ok (struct hd_driveid *id)
 119 {
 120         unsigned long lba_sects, chs_sects, head, tail;
 121
 122         /* No non-LBA info .. so valid! */
 123         if (id->cyls == 0)
 124                 return 1;
 125
 126         /*
 127          * The ATA spec tells large drives to return
 128          * C/H/S = 16383/16/63 independent of their size.
 129          * Some drives can be jumpered to use 15 heads instead of 16.
 130          * Some drives can be jumpered to use 4092 cyls instead of 16383.
 131          */
 132         if ((id->cyls == 16383
 133              || (id->cyls == 4092 && id->cur_cyls == 16383)) &&
 134             id->sectors == 63 &&
 135             (id->heads == 15 || id->heads == 16) &&
 136             (id->lba_capacity >= 16383*63*id->heads))
 137                 return 1;
 138
 139         lba_sects   = id->lba_capacity;
 140         chs_sects   = id->cyls * id->heads * id->sectors;
 141
 142         /* perform a rough sanity check on lba_sects:  within 10% is OK */
 143         if ((lba_sects - chs_sects) < chs_sects/10)
 144                 return 1;
 145
 146         /* some drives have the word order reversed */
 147         head = ((lba_sects >> 16) & 0xffff);
 148         tail = (lba_sects & 0xffff);
 149         lba_sects = (head | (tail << 16));
 150         if ((lba_sects - chs_sects) < chs_sects/10) {
 151                 id->lba_capacity = lba_sects;
 152                 return 1;       /* lba_capacity is (now) good */
 153         }
 154
 155         return 0;       /* lba_capacity value may be bad */
 156 }
 157
 158 /*
 159  * __ide_do_rw_disk() issues READ and WRITE commands to a disk,
 160  * using LBA if supported, or CHS otherwise, to address sectors.
 161  */
 162 static ide_startstop_t __ide_do_rw_disk(ide_drive_t *drive, struct request *rq, sector_t block)
 163 {
 164         ide_hwif_t *hwif        = HWIF(drive);
 165         unsigned int dma        = drive->using_dma;
 166         u8 lba48                = (drive->addressing == 1) ? 1 : 0;
 167         task_ioreg_t command    = WIN_NOP;
 168         ata_nsector_t           nsectors;
 169
 170         nsectors.all            = (u16) rq->nr_sectors;
 171
 172         if (hwif->no_lba48_dma && lba48 && dma) {
 173                 if (block + rq->nr_sectors > 1ULL << 28)
 174                         dma = 0;
 175                 else
 176                         lba48 = 0;
 177         }
 178
 179         if (!dma) {
 180                 ide_init_sg_cmd(drive, rq);
 181                 ide_map_sg(drive, rq);
 182         }
 183
 184         if (IDE_CONTROL_REG)
 185                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
 186
 187         /* FIXME: SELECT_MASK(drive, 0) ? */
 188
 189         if (drive->select.b.lba) {
 190                 if (lba48) {
 191                         task_ioreg_t tasklets[10];
 192
 193                         pr_debug("%s: LBA=0x%012llx\n", drive->name,
 194                                         (unsigned long long)block);
 195
 196                         tasklets[0] = 0;
 197                         tasklets[1] = 0;
 198                         tasklets[2] = nsectors.b.low;
 199                         tasklets[3] = nsectors.b.high;
 200                         tasklets[4] = (task_ioreg_t) block;
 201                         tasklets[5] = (task_ioreg_t) (block>>8);
 202                         tasklets[6] = (task_ioreg_t) (block>>16);
 203                         tasklets[7] = (task_ioreg_t) (block>>24);
 204                         if (sizeof(block) == 4) {
 205                                 tasklets[8] = (task_ioreg_t) 0;
 206                                 tasklets[9] = (task_ioreg_t) 0;
 207                         } else {
 208                                 tasklets[8] = (task_ioreg_t)((u64)block >> 32);
 209                                 tasklets[9] = (task_ioreg_t)((u64)block >> 40);
 210                         }
 211 #ifdef DEBUG
 212                         printk("%s: 0x%02x%02x 0x%02x%02x%02x%02x%02x%02x\n",
 213                                 drive->name, tasklets[3], tasklets[2],
 214                                 tasklets[9], tasklets[8], tasklets[7],
 215                                 tasklets[6], tasklets[5], tasklets[4]);
 216 #endif
 217                         hwif->OUTB(tasklets[1], IDE_FEATURE_REG);
 218                         hwif->OUTB(tasklets[3], IDE_NSECTOR_REG);
 219                         hwif->OUTB(tasklets[7], IDE_SECTOR_REG);
 220                         hwif->OUTB(tasklets[8], IDE_LCYL_REG);
 221                         hwif->OUTB(tasklets[9], IDE_HCYL_REG);
 222
 223                         hwif->OUTB(tasklets[0], IDE_FEATURE_REG);
 224                         hwif->OUTB(tasklets[2], IDE_NSECTOR_REG);
 225                         hwif->OUTB(tasklets[4], IDE_SECTOR_REG);
 226                         hwif->OUTB(tasklets[5], IDE_LCYL_REG);
 227                         hwif->OUTB(tasklets[6], IDE_HCYL_REG);
 228                         hwif->OUTB(0x00|drive->select.all,IDE_SELECT_REG);
 229                 } else {
 230                         hwif->OUTB(0x00, IDE_FEATURE_REG);
 231                         hwif->OUTB(nsectors.b.low, IDE_NSECTOR_REG);
 232                         hwif->OUTB(block, IDE_SECTOR_REG);
 233                         hwif->OUTB(block>>=8, IDE_LCYL_REG);
 234                         hwif->OUTB(block>>=8, IDE_HCYL_REG);
 235                         hwif->OUTB(((block>>8)&0x0f)|drive->select.all,IDE_SELECT_REG);
 236                 }
 237         } else {
 238                 unsigned int sect,head,cyl,track;
 239                 track = (int)block / drive->sect;
 240                 sect  = (int)block % drive->sect + 1;
 241                 hwif->OUTB(sect, IDE_SECTOR_REG);
 242                 head  = track % drive->head;
 243                 cyl   = track / drive->head;
 244
 245                 pr_debug("%s: CHS=%u/%u/%u\n", drive->name, cyl, head, sect);
 246
 247                 hwif->OUTB(0x00, IDE_FEATURE_REG);
 248                 hwif->OUTB(nsectors.b.low, IDE_NSECTOR_REG);
 249                 hwif->OUTB(cyl, IDE_LCYL_REG);
 250                 hwif->OUTB(cyl>>8, IDE_HCYL_REG);
 251                 hwif->OUTB(head|drive->select.all,IDE_SELECT_REG);
 252         }
 253
 254         if (dma) {
 255                 if (!hwif->dma_setup(drive)) {
 256                         if (rq_data_dir(rq)) {
 257                                 command = lba48 ? WIN_WRITEDMA_EXT : WIN_WRITEDMA;
 258                                 if (drive->vdma)
 259                                         command = lba48 ? WIN_WRITE_EXT: WIN_WRITE;
 260                         } else {
 261                                 command = lba48 ? WIN_READDMA_EXT : WIN_READDMA;
 262                                 if (drive->vdma)
 263                                         command = lba48 ? WIN_READ_EXT: WIN_READ;
 264                         }
 265                         hwif->dma_exec_cmd(drive, command);
 266                         hwif->dma_start(drive);
 267                         return ide_started;
 268                 }
 269                 /* fallback to PIO */
 270                 ide_init_sg_cmd(drive, rq);
 271         }
 272
 273         if (rq_data_dir(rq) == READ) {
 274
 275                 if (drive->mult_count) {
 276                         hwif->data_phase = TASKFILE_MULTI_IN;
 277                         command = lba48 ? WIN_MULTREAD_EXT : WIN_MULTREAD;
 278                 } else {
 279                         hwif->data_phase = TASKFILE_IN;
 280                         command = lba48 ? WIN_READ_EXT : WIN_READ;
 281                 }
 282
 283                 ide_execute_command(drive, command, &task_in_intr, WAIT_CMD, NULL);
 284                 return ide_started;
 285         } else {
 286                 if (drive->mult_count) {
 287                         hwif->data_phase = TASKFILE_MULTI_OUT;
 288                         command = lba48 ? WIN_MULTWRITE_EXT : WIN_MULTWRITE;
 289                 } else {
 290                         hwif->data_phase = TASKFILE_OUT;
 291                         command = lba48 ? WIN_WRITE_EXT : WIN_WRITE;
 292                 }
 293
 294                 /* FIXME: ->OUTBSYNC ? */
 295                 hwif->OUTB(command, IDE_COMMAND_REG);
 296
 297                 return pre_task_out_intr(drive, rq);
 298         }
 299 }
 300
 301 /*
 302  * 268435455  == 137439 MB or 28bit limit
 303  * 320173056  == 163929 MB or 48bit addressing
 304  * 1073741822 == 549756 MB or 48bit addressing fake drive
 305  */
 306
 307 static ide_startstop_t ide_do_rw_disk (ide_drive_t *drive, struct request *rq, sector_t block)
 308 {
 309         ide_hwif_t *hwif = HWIF(drive);
 310
 311         BUG_ON(drive->blocked);
 312
 313         if (!blk_fs_request(rq)) {
 314                 blk_dump_rq_flags(rq, "ide_do_rw_disk - bad command");
 315                 ide_end_request(drive, 0, 0);
 316                 return ide_stopped;
 317         }
 318
 319         ledtrig_ide_activity();
 320
 321         pr_debug("%s: %sing: block=%llu, sectors=%lu, buffer=0x%08lx\n",
 322                  drive->name, rq_data_dir(rq) == READ ? "read" : "writ",
 323                  (unsigned long long)block, rq->nr_sectors,
 324                  (unsigned long)rq->buffer);
 325
 326         if (hwif->rw_disk)
 327                 hwif->rw_disk(drive, rq);
 328
 329         return __ide_do_rw_disk(drive, rq, block);
 330 }
 331
 332 /*
 333  * Queries for true maximum capacity of the drive.
 334  * Returns maximum LBA address (> 0) of the drive, 0 if failed.
 335  */
 336 static unsigned long idedisk_read_native_max_address(ide_drive_t *drive)
 337 {
 338         ide_task_t args;
 339         unsigned long addr = 0;
 340
 341         /* Create IDE/ATA command request structure */
 342         memset(&args, 0, sizeof(ide_task_t));
 343         args.tfRegister[IDE_SELECT_OFFSET]      = 0x40;
 344         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_READ_NATIVE_MAX;
 345         args.command_type                       = IDE_DRIVE_TASK_NO_DATA;
 346         args.handler                            = &task_no_data_intr;
 347         /* submit command request */
 348         ide_raw_taskfile(drive, &args, NULL);
 349
 350         /* if OK, compute maximum address value */
 351         if ((args.tfRegister[IDE_STATUS_OFFSET] & 0x01) == 0) {
 352                 addr = ((args.tfRegister[IDE_SELECT_OFFSET] & 0x0f) << 24)
 353                      | ((args.tfRegister[  IDE_HCYL_OFFSET]       ) << 16)
 354                      | ((args.tfRegister[  IDE_LCYL_OFFSET]       ) <<  8)
 355                      | ((args.tfRegister[IDE_SECTOR_OFFSET]       ));
 356                 addr++; /* since the return value is (maxlba - 1), we add 1 */
 357         }
 358         return addr;
 359 }
 360
 361 static unsigned long long idedisk_read_native_max_address_ext(ide_drive_t *drive)
 362 {
 363         ide_task_t args;
 364         unsigned long long addr = 0;
 365
 366         /* Create IDE/ATA command request structure */
 367         memset(&args, 0, sizeof(ide_task_t));
 368
 369         args.tfRegister[IDE_SELECT_OFFSET]      = 0x40;
 370         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_READ_NATIVE_MAX_EXT;
 371         args.command_type                       = IDE_DRIVE_TASK_NO_DATA;
 372         args.handler                            = &task_no_data_intr;
 373         /* submit command request */
 374         ide_raw_taskfile(drive, &args, NULL);
 375
 376         /* if OK, compute maximum address value */
 377         if ((args.tfRegister[IDE_STATUS_OFFSET] & 0x01) == 0) {
 378                 u32 high = (args.hobRegister[IDE_HCYL_OFFSET] << 16) |
 379                            (args.hobRegister[IDE_LCYL_OFFSET] <<  8) |
 380                             args.hobRegister[IDE_SECTOR_OFFSET];
 381                 u32 low  = ((args.tfRegister[IDE_HCYL_OFFSET])<<16) |
 382                            ((args.tfRegister[IDE_LCYL_OFFSET])<<8) |
 383                             (args.tfRegister[IDE_SECTOR_OFFSET]);
 384                 addr = ((__u64)high << 24) | low;
 385                 addr++; /* since the return value is (maxlba - 1), we add 1 */
 386         }
 387         return addr;
 388 }
 389
 390 /*
 391  * Sets maximum virtual LBA address of the drive.
 392  * Returns new maximum virtual LBA address (> 0) or 0 on failure.
 393  */
 394 static unsigned long idedisk_set_max_address(ide_drive_t *drive, unsigned long addr_req)
 395 {
 396         ide_task_t args;
 397         unsigned long addr_set = 0;
 398
 399         addr_req--;
 400         /* Create IDE/ATA command request structure */
 401         memset(&args, 0, sizeof(ide_task_t));
 402         args.tfRegister[IDE_SECTOR_OFFSET]      = ((addr_req >>  0) & 0xff);
 403         args.tfRegister[IDE_LCYL_OFFSET]        = ((addr_req >>  8) & 0xff);
 404         args.tfRegister[IDE_HCYL_OFFSET]        = ((addr_req >> 16) & 0xff);
 405         args.tfRegister[IDE_SELECT_OFFSET]      = ((addr_req >> 24) & 0x0f) | 0x40;
 406         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SET_MAX;
 407         args.command_type                       = IDE_DRIVE_TASK_NO_DATA;
 408         args.handler                            = &task_no_data_intr;
 409         /* submit command request */
 410         ide_raw_taskfile(drive, &args, NULL);
 411         /* if OK, read new maximum address value */
 412         if ((args.tfRegister[IDE_STATUS_OFFSET] & 0x01) == 0) {
 413                 addr_set = ((args.tfRegister[IDE_SELECT_OFFSET] & 0x0f) << 24)
 414                          | ((args.tfRegister[  IDE_HCYL_OFFSET]       ) << 16)
 415                          | ((args.tfRegister[  IDE_LCYL_OFFSET]       ) <<  8)
 416                          | ((args.tfRegister[IDE_SECTOR_OFFSET]       ));
 417                 addr_set++;
 418         }
 419         return addr_set;
 420 }
 421
 422 static unsigned long long idedisk_set_max_address_ext(ide_drive_t *drive, unsigned long long addr_req)
 423 {
 424         ide_task_t args;
 425         unsigned long long addr_set = 0;
 426
 427         addr_req--;
 428         /* Create IDE/ATA command request structure */
 429         memset(&args, 0, sizeof(ide_task_t));
 430         args.tfRegister[IDE_SECTOR_OFFSET]      = ((addr_req >>  0) & 0xff);
 431         args.tfRegister[IDE_LCYL_OFFSET]        = ((addr_req >>= 8) & 0xff);
 432         args.tfRegister[IDE_HCYL_OFFSET]        = ((addr_req >>= 8) & 0xff);
 433         args.tfRegister[IDE_SELECT_OFFSET]      = 0x40;
 434         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SET_MAX_EXT;
 435         args.hobRegister[IDE_SECTOR_OFFSET]     = (addr_req >>= 8) & 0xff;
 436         args.hobRegister[IDE_LCYL_OFFSET]       = (addr_req >>= 8) & 0xff;
 437         args.hobRegister[IDE_HCYL_OFFSET]       = (addr_req >>= 8) & 0xff;
 438         args.hobRegister[IDE_SELECT_OFFSET]     = 0x40;
 439         args.hobRegister[IDE_CONTROL_OFFSET_HOB]= (drive->ctl|0x80);
 440         args.command_type                       = IDE_DRIVE_TASK_NO_DATA;
 441         args.handler                            = &task_no_data_intr;
 442         /* submit command request */
 443         ide_raw_taskfile(drive, &args, NULL);
 444         /* if OK, compute maximum address value */
 445         if ((args.tfRegister[IDE_STATUS_OFFSET] & 0x01) == 0) {
 446                 u32 high = (args.hobRegister[IDE_HCYL_OFFSET] << 16) |
 447                            (args.hobRegister[IDE_LCYL_OFFSET] <<  8) |
 448                             args.hobRegister[IDE_SECTOR_OFFSET];
 449                 u32 low  = ((args.tfRegister[IDE_HCYL_OFFSET])<<16) |
 450                            ((args.tfRegister[IDE_LCYL_OFFSET])<<8) |
 451                             (args.tfRegister[IDE_SECTOR_OFFSET]);
 452                 addr_set = ((__u64)high << 24) | low;
 453                 addr_set++;
 454         }
 455         return addr_set;
 456 }
 457
 458 static unsigned long long sectors_to_MB(unsigned long long n)
 459 {
 460         n <<= 9;                /* make it bytes */
 461         do_div(n, 1000000);     /* make it MB */
 462         return n;
 463 }
 464
 465 /*
 466  * Bits 10 of command_set_1 and cfs_enable_1 must be equal,
 467  * so on non-buggy drives we need test only one.
 468  * However, we should also check whether these fields are valid.
 469  */
 470 static inline int idedisk_supports_hpa(const struct hd_driveid *id)
 471 {
 472         return (id->command_set_1 & 0x0400) && (id->cfs_enable_1 & 0x0400);
 473 }
 474
 475 /*
 476  * The same here.
 477  */
 478 static inline int idedisk_supports_lba48(const struct hd_driveid *id)
 479 {
 480         return (id->command_set_2 & 0x0400) && (id->cfs_enable_2 & 0x0400)
 481                && id->lba_capacity_2;
 482 }
 483
 484 /*
 485  * Some disks report total number of sectors instead of
 486  * maximum sector address.  We list them here.
 487  */
 488 static const struct drive_list_entry hpa_list[] = {
 489         { "ST340823A",  NULL },
 490         { "ST320413A",  NULL },
 491         { NULL,         NULL }
 492 };
 493
 494 static void idedisk_check_hpa(ide_drive_t *drive)
 495 {
 496         unsigned long long capacity, set_max;
 497         int lba48 = idedisk_supports_lba48(drive->id);
 498
 499         capacity = drive->capacity64;
 500         if (lba48)
 501                 set_max = idedisk_read_native_max_address_ext(drive);
 502         else
 503                 set_max = idedisk_read_native_max_address(drive);
 504
 505         if (ide_in_drive_list(drive->id, hpa_list)) {
 506                 /*
 507                  * Since we are inclusive wrt to firmware revisions do this
 508                  * extra check and apply the workaround only when needed.
 509                  */
 510                 if (set_max == capacity + 1)
 511                         set_max--;
 512         }
 513
 514         if (set_max <= capacity)
 515                 return;
 516
 517         printk(KERN_INFO "%s: Host Protected Area detected.\n"
 518                          "\tcurrent capacity is %llu sectors (%llu MB)\n"
 519                          "\tnative  capacity is %llu sectors (%llu MB)\n",
 520                          drive->name,
 521                          capacity, sectors_to_MB(capacity),
 522                          set_max, sectors_to_MB(set_max));
 523
 524         if (lba48)
 525                 set_max = idedisk_set_max_address_ext(drive, set_max);
 526         else
 527                 set_max = idedisk_set_max_address(drive, set_max);
 528         if (set_max) {
 529                 drive->capacity64 = set_max;
 530                 printk(KERN_INFO "%s: Host Protected Area disabled.\n",
 531                                  drive->name);
 532         }
 533 }
 534
 535 /*
 536  * Compute drive->capacity, the full capacity of the drive
 537  * Called with drive->id != NULL.
 538  *
 539  * To compute capacity, this uses either of
 540  *
 541  *    1. CHS value set by user       (whatever user sets will be trusted)
 542  *    2. LBA value from target drive (require new ATA feature)
 543  *    3. LBA value from system BIOS  (new one is OK, old one may break)
 544  *    4. CHS value from system BIOS  (traditional style)
 545  *
 546  * in above order (i.e., if value of higher priority is available,
 547  * reset will be ignored).
 548  */
 549 static void init_idedisk_capacity (ide_drive_t  *drive)
 550 {
 551         struct hd_driveid *id = drive->id;
 552         /*
 553          * If this drive supports the Host Protected Area feature set,
 554          * then we may need to change our opinion about the drive's capacity.
 555          */
 556         int hpa = idedisk_supports_hpa(id);
 557
 558         if (idedisk_supports_lba48(id)) {
 559                 /* drive speaks 48-bit LBA */
 560                 drive->select.b.lba = 1;
 561                 drive->capacity64 = id->lba_capacity_2;
 562                 if (hpa)
 563                         idedisk_check_hpa(drive);
 564         } else if ((id->capability & 2) && lba_capacity_is_ok(id)) {
 565                 /* drive speaks 28-bit LBA */
 566                 drive->select.b.lba = 1;
 567                 drive->capacity64 = id->lba_capacity;
 568                 if (hpa)
 569                         idedisk_check_hpa(drive);
 570         } else {
 571                 /* drive speaks boring old 28-bit CHS */
 572                 drive->capacity64 = drive->cyl * drive->head * drive->sect;
 573         }
 574 }
 575
 576 static sector_t idedisk_capacity (ide_drive_t *drive)
 577 {
 578         return drive->capacity64 - drive->sect0;
 579 }
 580
 581 #ifdef CONFIG_IDE_PROC_FS
 582 static int smart_enable(ide_drive_t *drive)
 583 {
 584         ide_task_t args;
 585
 586         memset(&args, 0, sizeof(ide_task_t));
 587         args.tfRegister[IDE_FEATURE_OFFSET]     = SMART_ENABLE;
 588         args.tfRegister[IDE_LCYL_OFFSET]        = SMART_LCYL_PASS;
 589         args.tfRegister[IDE_HCYL_OFFSET]        = SMART_HCYL_PASS;
 590         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SMART;
 591         args.command_type                       = IDE_DRIVE_TASK_NO_DATA;
 592         args.handler                            = &task_no_data_intr;
 593         return ide_raw_taskfile(drive, &args, NULL);
 594 }
 595
 596 static int get_smart_values(ide_drive_t *drive, u8 *buf)
 597 {
 598         ide_task_t args;
 599
 600         memset(&args, 0, sizeof(ide_task_t));
 601         args.tfRegister[IDE_FEATURE_OFFSET]     = SMART_READ_VALUES;
 602         args.tfRegister[IDE_NSECTOR_OFFSET]     = 0x01;
 603         args.tfRegister[IDE_LCYL_OFFSET]        = SMART_LCYL_PASS;
 604         args.tfRegister[IDE_HCYL_OFFSET]        = SMART_HCYL_PASS;
 605         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SMART;
 606         args.command_type                       = IDE_DRIVE_TASK_IN;
 607         args.data_phase                         = TASKFILE_IN;
 608         args.handler                            = &task_in_intr;
 609         (void) smart_enable(drive);
 610         return ide_raw_taskfile(drive, &args, buf);
 611 }
 612
 613 static int get_smart_thresholds(ide_drive_t *drive, u8 *buf)
 614 {
 615         ide_task_t args;
 616         memset(&args, 0, sizeof(ide_task_t));
 617         args.tfRegister[IDE_FEATURE_OFFSET]     = SMART_READ_THRESHOLDS;
 618         args.tfRegister[IDE_NSECTOR_OFFSET]     = 0x01;
 619         args.tfRegister[IDE_LCYL_OFFSET]        = SMART_LCYL_PASS;
 620         args.tfRegister[IDE_HCYL_OFFSET]        = SMART_HCYL_PASS;
 621         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SMART;
 622         args.command_type                       = IDE_DRIVE_TASK_IN;
 623         args.data_phase                         = TASKFILE_IN;
 624         args.handler                            = &task_in_intr;
 625         (void) smart_enable(drive);
 626         return ide_raw_taskfile(drive, &args, buf);
 627 }
 628
 629 static int proc_idedisk_read_cache
 630         (char *page, char **start, off_t off, int count, int *eof, void *data)
 631 {
 632         ide_drive_t     *drive = (ide_drive_t *) data;
 633         char            *out = page;
 634         int             len;
 635
 636         if (drive->id_read)
 637                 len = sprintf(out,"%i\n", drive->id->buf_size / 2);
 638         else
 639                 len = sprintf(out,"(none)\n");
 640         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 641 }
 642
 643 static int proc_idedisk_read_capacity
 644         (char *page, char **start, off_t off, int count, int *eof, void *data)
 645 {
 646         ide_drive_t*drive = (ide_drive_t *)data;
 647         int len;
 648
 649         len = sprintf(page,"%llu\n", (long long)idedisk_capacity(drive));
 650         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 651 }
 652
 653 static int proc_idedisk_read_smart_thresholds
 654         (char *page, char **start, off_t off, int count, int *eof, void *data)
 655 {
 656         ide_drive_t     *drive = (ide_drive_t *)data;
 657         int             len = 0, i = 0;
 658
 659         if (!get_smart_thresholds(drive, page)) {
 660                 unsigned short *val = (unsigned short *) page;
 661                 char *out = ((char *)val) + (SECTOR_WORDS * 4);
 662                 page = out;
 663                 do {
 664                         out += sprintf(out, "%04x%c", le16_to_cpu(*val), (++i & 7) ? ' ' : '\n');
 665                         val += 1;
 666                 } while (i < (SECTOR_WORDS * 2));
 667                 len = out - page;
 668         }
 669         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 670 }
 671
 672 static int proc_idedisk_read_smart_values
 673         (char *page, char **start, off_t off, int count, int *eof, void *data)
 674 {
 675         ide_drive_t     *drive = (ide_drive_t *)data;
 676         int             len = 0, i = 0;
 677
 678         if (!get_smart_values(drive, page)) {
 679                 unsigned short *val = (unsigned short *) page;
 680                 char *out = ((char *)val) + (SECTOR_WORDS * 4);
 681                 page = out;
 682                 do {
 683                         out += sprintf(out, "%04x%c", le16_to_cpu(*val), (++i & 7) ? ' ' : '\n');
 684                         val += 1;
 685                 } while (i < (SECTOR_WORDS * 2));
 686                 len = out - page;
 687         }
 688         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 689 }
 690
 691 static ide_proc_entry_t idedisk_proc[] = {
 692         { "cache",              S_IFREG|S_IRUGO,        proc_idedisk_read_cache,                NULL },
 693         { "capacity",           S_IFREG|S_IRUGO,        proc_idedisk_read_capacity,             NULL },
 694         { "geometry",           S_IFREG|S_IRUGO,        proc_ide_read_geometry,                 NULL },
 695         { "smart_values",       S_IFREG|S_IRUSR,        proc_idedisk_read_smart_values,         NULL },
 696         { "smart_thresholds",   S_IFREG|S_IRUSR,        proc_idedisk_read_smart_thresholds,     NULL },
 697         { NULL, 0, NULL, NULL }
 698 };
 699 #endif  /* CONFIG_IDE_PROC_FS */
 700
 701 static void idedisk_prepare_flush(struct request_queue *q, struct request *rq)
 702 {
 703         ide_drive_t *drive = q->queuedata;
 704
 705         memset(rq->cmd, 0, sizeof(rq->cmd));
 706
 707         if (ide_id_has_flush_cache_ext(drive->id) &&
 708             (drive->capacity64 >= (1UL << 28)))
 709                 rq->cmd[0] = WIN_FLUSH_CACHE_EXT;
 710         else
 711                 rq->cmd[0] = WIN_FLUSH_CACHE;
 712
 713
 714         rq->cmd_type = REQ_TYPE_ATA_TASK;
 715         rq->cmd_flags |= REQ_SOFTBARRIER;
 716         rq->buffer = rq->cmd;
 717 }
 718
 719 /*
 720  * This is tightly woven into the driver->do_special can not touch.
 721  * DON'T do it again until a total personality rewrite is committed.
 722  */
 723 static int set_multcount(ide_drive_t *drive, int arg)
 724 {
 725         struct request rq;
 726
 727         if (arg < 0 || arg > drive->id->max_multsect)
 728                 return -EINVAL;
 729
 730         if (drive->special.b.set_multmode)
 731                 return -EBUSY;
 732         ide_init_drive_cmd (&rq);
 733         rq.cmd_type = REQ_TYPE_ATA_CMD;
 734         drive->mult_req = arg;
 735         drive->special.b.set_multmode = 1;
 736         (void) ide_do_drive_cmd (drive, &rq, ide_wait);
 737         return (drive->mult_count == arg) ? 0 : -EIO;
 738 }
 739
 740 static int set_nowerr(ide_drive_t *drive, int arg)
 741 {
 742         if (arg < 0 || arg > 1)
 743                 return -EINVAL;
 744
 745         if (ide_spin_wait_hwgroup(drive))
 746                 return -EBUSY;
 747         drive->nowerr = arg;
 748         drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;
 749         spin_unlock_irq(&ide_lock);
 750         return 0;
 751 }
 752
 753 static void update_ordered(ide_drive_t *drive)
 754 {
 755         struct hd_driveid *id = drive->id;
 756         unsigned ordered = QUEUE_ORDERED_NONE;
 757         prepare_flush_fn *prep_fn = NULL;
 758
 759         if (drive->wcache) {
 760                 unsigned long long capacity;
 761                 int barrier;
 762                 /*
 763                  * We must avoid issuing commands a drive does not
 764                  * understand or we may crash it. We check flush cache
 765                  * is supported. We also check we have the LBA48 flush
 766                  * cache if the drive capacity is too large. By this
 767                  * time we have trimmed the drive capacity if LBA48 is
 768                  * not available so we don't need to recheck that.
 769                  */
 770                 capacity = idedisk_capacity(drive);
 771                 barrier = ide_id_has_flush_cache(id) && !drive->noflush &&
 772                         (drive->addressing == 0 || capacity <= (1ULL << 28) ||
 773                          ide_id_has_flush_cache_ext(id));
 774
 775                 printk(KERN_INFO "%s: cache flushes %ssupported\n",
 776                        drive->name, barrier ? "" : "not ");
 777
 778                 if (barrier) {
 779                         ordered = QUEUE_ORDERED_DRAIN_FLUSH;
 780                         prep_fn = idedisk_prepare_flush;
 781                 }
 782         } else
 783                 ordered = QUEUE_ORDERED_DRAIN;
 784
 785         blk_queue_ordered(drive->queue, ordered, prep_fn);
 786 }
 787
 788 static int write_cache(ide_drive_t *drive, int arg)
 789 {
 790         ide_task_t args;
 791         int err = 1;
 792
 793         if (arg < 0 || arg > 1)
 794                 return -EINVAL;
 795
 796         if (ide_id_has_flush_cache(drive->id)) {
 797                 memset(&args, 0, sizeof(ide_task_t));
 798                 args.tfRegister[IDE_FEATURE_OFFSET]     = (arg) ?
 799                         SETFEATURES_EN_WCACHE : SETFEATURES_DIS_WCACHE;
 800                 args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SETFEATURES;
 801                 args.command_type               = IDE_DRIVE_TASK_NO_DATA;
 802                 args.handler                    = &task_no_data_intr;
 803                 err = ide_raw_taskfile(drive, &args, NULL);
 804                 if (err == 0)
 805                         drive->wcache = arg;
 806         }
 807
 808         update_ordered(drive);
 809
 810         return err;
 811 }
 812
 813 static int do_idedisk_flushcache (ide_drive_t *drive)
 814 {
 815         ide_task_t args;
 816
 817         memset(&args, 0, sizeof(ide_task_t));
 818         if (ide_id_has_flush_cache_ext(drive->id))
 819                 args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_FLUSH_CACHE_EXT;
 820         else
 821                 args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_FLUSH_CACHE;
 822         args.command_type                       = IDE_DRIVE_TASK_NO_DATA;
 823         args.handler                            = &task_no_data_intr;
 824         return ide_raw_taskfile(drive, &args, NULL);
 825 }
 826
 827 static int set_acoustic (ide_drive_t *drive, int arg)
 828 {
 829         ide_task_t args;
 830
 831         if (arg < 0 || arg > 254)
 832                 return -EINVAL;
 833
 834         memset(&args, 0, sizeof(ide_task_t));
 835         args.tfRegister[IDE_FEATURE_OFFSET]     = (arg) ? SETFEATURES_EN_AAM :
 836                                                           SETFEATURES_DIS_AAM;
 837         args.tfRegister[IDE_NSECTOR_OFFSET]     = arg;
 838         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SETFEATURES;
 839         args.command_type = IDE_DRIVE_TASK_NO_DATA;
 840         args.handler      = &task_no_data_intr;
 841         ide_raw_taskfile(drive, &args, NULL);
 842         drive->acoustic = arg;
 843         return 0;
 844 }
 845
 846 /*
 847  * drive->addressing:
 848  *      0: 28-bit
 849  *      1: 48-bit
 850  *      2: 48-bit capable doing 28-bit
 851  */
 852 static int set_lba_addressing(ide_drive_t *drive, int arg)
 853 {
 854         if (arg < 0 || arg > 2)
 855                 return -EINVAL;
 856
 857         drive->addressing =  0;
 858
 859         if (HWIF(drive)->no_lba48)
 860                 return 0;
 861
 862         if (!idedisk_supports_lba48(drive->id))
 863                 return -EIO;
 864         drive->addressing = arg;
 865         return 0;
 866 }
 867
 868 #ifdef CONFIG_IDE_PROC_FS
 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,     TYPE_INT,       0,      65535,                  1,      1,      &drive->bios_cyl,       NULL);
 874         ide_add_setting(drive,  "bios_head",    SETTING_RW,     TYPE_BYTE,      0,      255,                    1,      1,      &drive->bios_head,      NULL);
 875         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     TYPE_BYTE,      0,      63,                     1,      1,      &drive->bios_sect,      NULL);
 876         ide_add_setting(drive,  "address",      SETTING_RW,     TYPE_BYTE,      0,      2,                      1,      1,      &drive->addressing,     set_lba_addressing);
 877         ide_add_setting(drive,  "bswap",        SETTING_READ,   TYPE_BYTE,      0,      1,                      1,      1,      &drive->bswap,          NULL);
 878         ide_add_setting(drive,  "multcount",    SETTING_RW,     TYPE_BYTE,      0,      id->max_multsect,       1,      1,      &drive->mult_count,     set_multcount);
 879         ide_add_setting(drive,  "nowerr",       SETTING_RW,     TYPE_BYTE,      0,      1,                      1,      1,      &drive->nowerr,         set_nowerr);
 880         ide_add_setting(drive,  "lun",          SETTING_RW,     TYPE_INT,       0,      7,                      1,      1,      &drive->lun,            NULL);
 881         ide_add_setting(drive,  "wcache",       SETTING_RW,     TYPE_BYTE,      0,      1,                      1,      1,      &drive->wcache,         write_cache);
 882         ide_add_setting(drive,  "acoustic",     SETTING_RW,     TYPE_BYTE,      0,      254,                    1,      1,      &drive->acoustic,       set_acoustic);
 883         ide_add_setting(drive,  "failures",     SETTING_RW,     TYPE_INT,       0,      65535,                  1,      1,      &drive->failures,       NULL);
 884         ide_add_setting(drive,  "max_failures", SETTING_RW,     TYPE_INT,       0,      65535,                  1,      1,      &drive->max_failures,   NULL);
 885 }
 886 #else
 887 static inline void idedisk_add_settings(ide_drive_t *drive) { ; }
 888 #endif
 889
 890 static void idedisk_setup (ide_drive_t *drive)
 891 {
 892         struct hd_driveid *id = drive->id;
 893         unsigned long long capacity;
 894
 895         idedisk_add_settings(drive);
 896
 897         if (drive->id_read == 0)
 898                 return;
 899
 900         if (drive->removable) {
 901                 /*
 902                  * Removable disks (eg. SYQUEST); ignore 'WD' drives
 903                  */
 904                 if (id->model[0] != 'W' || id->model[1] != 'D') {
 905                         drive->doorlocking = 1;
 906                 }
 907         }
 908
 909         (void)set_lba_addressing(drive, 1);
 910
 911         if (drive->addressing == 1) {
 912                 ide_hwif_t *hwif = HWIF(drive);
 913                 int max_s = 2048;
 914
 915                 if (max_s > hwif->rqsize)
 916                         max_s = hwif->rqsize;
 917
 918                 blk_queue_max_sectors(drive->queue, max_s);
 919         }
 920
 921         printk(KERN_INFO "%s: max request size: %dKiB\n", drive->name, drive->queue->max_sectors / 2);
 922
 923         /* calculate drive capacity, and select LBA if possible */
 924         init_idedisk_capacity (drive);
 925
 926         /* limit drive capacity to 137GB if LBA48 cannot be used */
 927         if (drive->addressing == 0 && drive->capacity64 > 1ULL << 28) {
 928                 printk(KERN_WARNING "%s: cannot use LBA48 - full capacity "
 929                        "%llu sectors (%llu MB)\n",
 930                        drive->name, (unsigned long long)drive->capacity64,
 931                        sectors_to_MB(drive->capacity64));
 932                 drive->capacity64 = 1ULL << 28;
 933         }
 934
 935         if (drive->hwif->no_lba48_dma && drive->addressing) {
 936                 if (drive->capacity64 > 1ULL << 28) {
 937                         printk(KERN_INFO "%s: cannot use LBA48 DMA - PIO mode will"
 938                                          " be used for accessing sectors > %u\n",
 939                                          drive->name, 1 << 28);
 940                 } else
 941                         drive->addressing = 0;
 942         }
 943
 944         /*
 945          * if possible, give fdisk access to more of the drive,
 946          * by correcting bios_cyls:
 947          */
 948         capacity = idedisk_capacity (drive);
 949         if (!drive->forced_geom) {
 950
 951                 if (idedisk_supports_lba48(drive->id)) {
 952                         /* compatibility */
 953                         drive->bios_sect = 63;
 954                         drive->bios_head = 255;
 955                 }
 956
 957                 if (drive->bios_sect && drive->bios_head) {
 958                         unsigned int cap0 = capacity; /* truncate to 32 bits */
 959                         unsigned int cylsz, cyl;
 960
 961                         if (cap0 != capacity)
 962                                 drive->bios_cyl = 65535;
 963                         else {
 964                                 cylsz = drive->bios_sect * drive->bios_head;
 965                                 cyl = cap0 / cylsz;
 966                                 if (cyl > 65535)
 967                                         cyl = 65535;
 968                                 if (cyl > drive->bios_cyl)
 969                                         drive->bios_cyl = cyl;
 970                         }
 971                 }
 972         }
 973         printk(KERN_INFO "%s: %llu sectors (%llu MB)",
 974                          drive->name, capacity, sectors_to_MB(capacity));
 975
 976         /* Only print cache size when it was specified */
 977         if (id->buf_size)
 978                 printk (" w/%dKiB Cache", id->buf_size/2);
 979
 980         printk(", CHS=%d/%d/%d",
 981                drive->bios_cyl, drive->bios_head, drive->bios_sect);
 982         if (drive->using_dma)
 983                 ide_dma_verbose(drive);
 984         printk("\n");
 985
 986         /* write cache enabled? */
 987         if ((id->csfo & 1) || (id->cfs_enable_1 & (1 << 5)))
 988                 drive->wcache = 1;
 989
 990         write_cache(drive, 1);
 991 }
 992
 993 static void ide_cacheflush_p(ide_drive_t *drive)
 994 {
 995         if (!drive->wcache || !ide_id_has_flush_cache(drive->id))
 996                 return;
 997
 998         if (do_idedisk_flushcache(drive))
 999                 printk(KERN_INFO "%s: wcache flush failed!\n", drive->name);
1000 }
1001
1002 static void ide_disk_remove(ide_drive_t *drive)
1003 {
1004         struct ide_disk_obj *idkp = drive->driver_data;
1005         struct gendisk *g = idkp->disk;
1006
1007         ide_proc_unregister_driver(drive, idkp->driver);
1008
1009         del_gendisk(g);
1010
1011         ide_cacheflush_p(drive);
1012
1013         ide_disk_put(idkp);
1014 }
1015
1016 static void ide_disk_release(struct kref *kref)
1017 {
1018         struct ide_disk_obj *idkp = to_ide_disk(kref);
1019         ide_drive_t *drive = idkp->drive;
1020         struct gendisk *g = idkp->disk;
1021
1022         drive->driver_data = NULL;
1023         g->private_data = NULL;
1024         put_disk(g);
1025         kfree(idkp);
1026 }
1027
1028 static int ide_disk_probe(ide_drive_t *drive);
1029
1030 /*
1031  * On HPA drives the capacity needs to be
1032  * reinitilized on resume otherwise the disk
1033  * can not be used and a hard reset is required
1034  */
1035 static void ide_disk_resume(ide_drive_t *drive)
1036 {
1037         if (idedisk_supports_hpa(drive->id))
1038                 init_idedisk_capacity(drive);
1039 }
1040
1041 static void ide_device_shutdown(ide_drive_t *drive)
1042 {
1043 #ifdef  CONFIG_ALPHA
1044         /* On Alpha, halt(8) doesn't actually turn the machine off,
1045            it puts you into the sort of firmware monitor. Typically,
1046            it's used to boot another kernel image, so it's not much
1047            different from reboot(8). Therefore, we don't need to
1048            spin down the disk in this case, especially since Alpha
1049            firmware doesn't handle disks in standby mode properly.
1050            On the other hand, it's reasonably safe to turn the power
1051            off when the shutdown process reaches the firmware prompt,
1052            as the firmware initialization takes rather long time -
1053            at least 10 seconds, which should be sufficient for
1054            the disk to expire its write cache. */
1055         if (system_state != SYSTEM_POWER_OFF) {
1056 #else
1057         if (system_state == SYSTEM_RESTART) {
1058 #endif
1059                 ide_cacheflush_p(drive);
1060                 return;
1061         }
1062
1063         printk("Shutdown: %s\n", drive->name);
1064         drive->gendev.bus->suspend(&drive->gendev, PMSG_SUSPEND);
1065 }
1066
1067 static ide_driver_t idedisk_driver = {
1068         .gen_driver = {
1069                 .owner          = THIS_MODULE,
1070                 .name           = "ide-disk",
1071                 .bus            = &ide_bus_type,
1072         },
1073         .probe                  = ide_disk_probe,
1074         .remove                 = ide_disk_remove,
1075         .resume                 = ide_disk_resume,
1076         .shutdown               = ide_device_shutdown,
1077         .version                = IDEDISK_VERSION,
1078         .media                  = ide_disk,
1079         .supports_dsc_overlap   = 0,
1080         .do_request             = ide_do_rw_disk,
1081         .end_request            = ide_end_request,
1082         .error                  = __ide_error,
1083         .abort                  = __ide_abort,
1084 #ifdef CONFIG_IDE_PROC_FS
1085         .proc                   = idedisk_proc,
1086 #endif
1087 };
1088
1089 static int idedisk_open(struct inode *inode, struct file *filp)
1090 {
1091         struct gendisk *disk = inode->i_bdev->bd_disk;
1092         struct ide_disk_obj *idkp;
1093         ide_drive_t *drive;
1094
1095         if (!(idkp = ide_disk_get(disk)))
1096                 return -ENXIO;
1097
1098         drive = idkp->drive;
1099
1100         idkp->openers++;
1101
1102         if (drive->removable && idkp->openers == 1) {
1103                 ide_task_t args;
1104                 memset(&args, 0, sizeof(ide_task_t));
1105                 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_DOORLOCK;
1106                 args.command_type = IDE_DRIVE_TASK_NO_DATA;
1107                 args.handler      = &task_no_data_intr;
1108                 check_disk_change(inode->i_bdev);
1109                 /*
1110                  * Ignore the return code from door_lock,
1111                  * since the open() has already succeeded,
1112                  * and the door_lock is irrelevant at this point.
1113                  */
1114                 if (drive->doorlocking && ide_raw_taskfile(drive, &args, NULL))
1115                         drive->doorlocking = 0;
1116         }
1117         return 0;
1118 }
1119
1120 static int idedisk_release(struct inode *inode, struct file *filp)
1121 {
1122         struct gendisk *disk = inode->i_bdev->bd_disk;
1123         struct ide_disk_obj *idkp = ide_disk_g(disk);
1124         ide_drive_t *drive = idkp->drive;
1125
1126         if (idkp->openers == 1)
1127                 ide_cacheflush_p(drive);
1128
1129         if (drive->removable && idkp->openers == 1) {
1130                 ide_task_t args;
1131                 memset(&args, 0, sizeof(ide_task_t));
1132                 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_DOORUNLOCK;
1133                 args.command_type = IDE_DRIVE_TASK_NO_DATA;
1134                 args.handler      = &task_no_data_intr;
1135                 if (drive->doorlocking && ide_raw_taskfile(drive, &args, NULL))
1136                         drive->doorlocking = 0;
1137         }
1138
1139         idkp->openers--;
1140
1141         ide_disk_put(idkp);
1142
1143         return 0;
1144 }
1145
1146 static int idedisk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1147 {
1148         struct ide_disk_obj *idkp = ide_disk_g(bdev->bd_disk);
1149         ide_drive_t *drive = idkp->drive;
1150
1151         geo->heads = drive->bios_head;
1152         geo->sectors = drive->bios_sect;
1153         geo->cylinders = (u16)drive->bios_cyl; /* truncate */
1154         return 0;
1155 }
1156
1157 static int idedisk_ioctl(struct inode *inode, struct file *file,
1158                         unsigned int cmd, unsigned long arg)
1159 {
1160         unsigned long flags;
1161         struct block_device *bdev = inode->i_bdev;
1162         struct ide_disk_obj *idkp = ide_disk_g(bdev->bd_disk);
1163         ide_drive_t *drive = idkp->drive;
1164         int err, (*setfunc)(ide_drive_t *, int);
1165         u8 *val;
1166
1167         switch (cmd) {
1168         case HDIO_GET_ADDRESS:   val = &drive->addressing;      goto read_val;
1169         case HDIO_GET_MULTCOUNT: val = &drive->mult_count;      goto read_val;
1170         case HDIO_GET_NOWERR:    val = &drive->nowerr;          goto read_val;
1171         case HDIO_GET_WCACHE:    val = &drive->wcache;          goto read_val;
1172         case HDIO_GET_ACOUSTIC:  val = &drive->acoustic;        goto read_val;
1173         case HDIO_SET_ADDRESS:   setfunc = set_lba_addressing;  goto set_val;
1174         case HDIO_SET_MULTCOUNT: setfunc = set_multcount;       goto set_val;
1175         case HDIO_SET_NOWERR:    setfunc = set_nowerr;          goto set_val;
1176         case HDIO_SET_WCACHE:    setfunc = write_cache;         goto set_val;
1177         case HDIO_SET_ACOUSTIC:  setfunc = set_acoustic;        goto set_val;
1178         }
1179
1180         return generic_ide_ioctl(drive, file, bdev, cmd, arg);
1181
1182 read_val:
1183         mutex_lock(&ide_setting_mtx);
1184         spin_lock_irqsave(&ide_lock, flags);
1185         err = *val;
1186         spin_unlock_irqrestore(&ide_lock, flags);
1187         mutex_unlock(&ide_setting_mtx);
1188         return err >= 0 ? put_user(err, (long __user *)arg) : err;
1189
1190 set_val:
1191         if (bdev != bdev->bd_contains)
1192                 err = -EINVAL;
1193         else {
1194                 if (!capable(CAP_SYS_ADMIN))
1195                         err = -EACCES;
1196                 else {
1197                         mutex_lock(&ide_setting_mtx);
1198                         err = setfunc(drive, arg);
1199                         mutex_unlock(&ide_setting_mtx);
1200                 }
1201         }
1202         return err;
1203 }
1204
1205 static int idedisk_media_changed(struct gendisk *disk)
1206 {
1207         struct ide_disk_obj *idkp = ide_disk_g(disk);
1208         ide_drive_t *drive = idkp->drive;
1209
1210         /* do not scan partitions twice if this is a removable device */
1211         if (drive->attach) {
1212                 drive->attach = 0;
1213                 return 0;
1214         }
1215         /* if removable, always assume it was changed */
1216         return drive->removable;
1217 }
1218
1219 static int idedisk_revalidate_disk(struct gendisk *disk)
1220 {
1221         struct ide_disk_obj *idkp = ide_disk_g(disk);
1222         set_capacity(disk, idedisk_capacity(idkp->drive));
1223         return 0;
1224 }
1225
1226 static struct block_device_operations idedisk_ops = {
1227         .owner          = THIS_MODULE,
1228         .open           = idedisk_open,
1229         .release        = idedisk_release,
1230         .ioctl          = idedisk_ioctl,
1231         .getgeo         = idedisk_getgeo,
1232         .media_changed  = idedisk_media_changed,
1233         .revalidate_disk= idedisk_revalidate_disk
1234 };
1235
1236 MODULE_DESCRIPTION("ATA DISK Driver");
1237
1238 static int ide_disk_probe(ide_drive_t *drive)
1239 {
1240         struct ide_disk_obj *idkp;
1241         struct gendisk *g;
1242
1243         /* strstr("foo", "") is non-NULL */
1244         if (!strstr("ide-disk", drive->driver_req))
1245                 goto failed;
1246         if (!drive->present)
1247                 goto failed;
1248         if (drive->media != ide_disk)
1249                 goto failed;
1250
1251         idkp = kzalloc(sizeof(*idkp), GFP_KERNEL);
1252         if (!idkp)
1253                 goto failed;
1254
1255         g = alloc_disk_node(1 << PARTN_BITS,
1256                         hwif_to_node(drive->hwif));
1257         if (!g)
1258                 goto out_free_idkp;
1259
1260         ide_init_disk(g, drive);
1261
1262         ide_proc_register_driver(drive, &idedisk_driver);
1263
1264         kref_init(&idkp->kref);
1265
1266         idkp->drive = drive;
1267         idkp->driver = &idedisk_driver;
1268         idkp->disk = g;
1269
1270         g->private_data = &idkp->driver;
1271
1272         drive->driver_data = idkp;
1273
1274         idedisk_setup(drive);
1275         if ((!drive->head || drive->head > 16) && !drive->select.b.lba) {
1276                 printk(KERN_ERR "%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
1277                         drive->name, drive->head);
1278                 drive->attach = 0;
1279         } else
1280                 drive->attach = 1;
1281
1282         g->minors = 1 << PARTN_BITS;
1283         g->driverfs_dev = &drive->gendev;
1284         g->flags = drive->removable ? GENHD_FL_REMOVABLE : 0;
1285         set_capacity(g, idedisk_capacity(drive));
1286         g->fops = &idedisk_ops;
1287         add_disk(g);
1288         return 0;
1289
1290 out_free_idkp:
1291         kfree(idkp);
1292 failed:
1293         return -ENODEV;
1294 }
1295
1296 static void __exit idedisk_exit (void)
1297 {
1298         driver_unregister(&idedisk_driver.gen_driver);
1299 }
1300
1301 static int __init idedisk_init(void)
1302 {
1303         return driver_register(&idedisk_driver.gen_driver);
1304 }
1305
1306 MODULE_ALIAS("ide:*m-disk*");
1307 module_init(idedisk_init);
1308 module_exit(idedisk_exit);
1309 MODULE_LICENSE("GPL");