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 //#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 static void idedisk_check_hpa(ide_drive_t *drive)
 485 {
 486         unsigned long long capacity, set_max;
 487         int lba48 = idedisk_supports_lba48(drive->id);
 488
 489         capacity = drive->capacity64;
 490         if (lba48)
 491                 set_max = idedisk_read_native_max_address_ext(drive);
 492         else
 493                 set_max = idedisk_read_native_max_address(drive);
 494
 495         if (set_max <= capacity)
 496                 return;
 497
 498         printk(KERN_INFO "%s: Host Protected Area detected.\n"
 499                          "\tcurrent capacity is %llu sectors (%llu MB)\n"
 500                          "\tnative  capacity is %llu sectors (%llu MB)\n",
 501                          drive->name,
 502                          capacity, sectors_to_MB(capacity),
 503                          set_max, sectors_to_MB(set_max));
 504
 505         if (lba48)
 506                 set_max = idedisk_set_max_address_ext(drive, set_max);
 507         else
 508                 set_max = idedisk_set_max_address(drive, set_max);
 509         if (set_max) {
 510                 drive->capacity64 = set_max;
 511                 printk(KERN_INFO "%s: Host Protected Area disabled.\n",
 512                                  drive->name);
 513         }
 514 }
 515
 516 /*
 517  * Compute drive->capacity, the full capacity of the drive
 518  * Called with drive->id != NULL.
 519  *
 520  * To compute capacity, this uses either of
 521  *
 522  *    1. CHS value set by user       (whatever user sets will be trusted)
 523  *    2. LBA value from target drive (require new ATA feature)
 524  *    3. LBA value from system BIOS  (new one is OK, old one may break)
 525  *    4. CHS value from system BIOS  (traditional style)
 526  *
 527  * in above order (i.e., if value of higher priority is available,
 528  * reset will be ignored).
 529  */
 530 static void init_idedisk_capacity (ide_drive_t  *drive)
 531 {
 532         struct hd_driveid *id = drive->id;
 533         /*
 534          * If this drive supports the Host Protected Area feature set,
 535          * then we may need to change our opinion about the drive's capacity.
 536          */
 537         int hpa = idedisk_supports_hpa(id);
 538
 539         if (idedisk_supports_lba48(id)) {
 540                 /* drive speaks 48-bit LBA */
 541                 drive->select.b.lba = 1;
 542                 drive->capacity64 = id->lba_capacity_2;
 543                 if (hpa)
 544                         idedisk_check_hpa(drive);
 545         } else if ((id->capability & 2) && lba_capacity_is_ok(id)) {
 546                 /* drive speaks 28-bit LBA */
 547                 drive->select.b.lba = 1;
 548                 drive->capacity64 = id->lba_capacity;
 549                 if (hpa)
 550                         idedisk_check_hpa(drive);
 551         } else {
 552                 /* drive speaks boring old 28-bit CHS */
 553                 drive->capacity64 = drive->cyl * drive->head * drive->sect;
 554         }
 555 }
 556
 557 static sector_t idedisk_capacity (ide_drive_t *drive)
 558 {
 559         return drive->capacity64 - drive->sect0;
 560 }
 561
 562 #ifdef CONFIG_PROC_FS
 563
 564 static int smart_enable(ide_drive_t *drive)
 565 {
 566         ide_task_t args;
 567
 568         memset(&args, 0, sizeof(ide_task_t));
 569         args.tfRegister[IDE_FEATURE_OFFSET]     = SMART_ENABLE;
 570         args.tfRegister[IDE_LCYL_OFFSET]        = SMART_LCYL_PASS;
 571         args.tfRegister[IDE_HCYL_OFFSET]        = SMART_HCYL_PASS;
 572         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SMART;
 573         args.command_type                       = IDE_DRIVE_TASK_NO_DATA;
 574         args.handler                            = &task_no_data_intr;
 575         return ide_raw_taskfile(drive, &args, NULL);
 576 }
 577
 578 static int get_smart_values(ide_drive_t *drive, u8 *buf)
 579 {
 580         ide_task_t args;
 581
 582         memset(&args, 0, sizeof(ide_task_t));
 583         args.tfRegister[IDE_FEATURE_OFFSET]     = SMART_READ_VALUES;
 584         args.tfRegister[IDE_NSECTOR_OFFSET]     = 0x01;
 585         args.tfRegister[IDE_LCYL_OFFSET]        = SMART_LCYL_PASS;
 586         args.tfRegister[IDE_HCYL_OFFSET]        = SMART_HCYL_PASS;
 587         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SMART;
 588         args.command_type                       = IDE_DRIVE_TASK_IN;
 589         args.data_phase                         = TASKFILE_IN;
 590         args.handler                            = &task_in_intr;
 591         (void) smart_enable(drive);
 592         return ide_raw_taskfile(drive, &args, buf);
 593 }
 594
 595 static int get_smart_thresholds(ide_drive_t *drive, u8 *buf)
 596 {
 597         ide_task_t args;
 598         memset(&args, 0, sizeof(ide_task_t));
 599         args.tfRegister[IDE_FEATURE_OFFSET]     = SMART_READ_THRESHOLDS;
 600         args.tfRegister[IDE_NSECTOR_OFFSET]     = 0x01;
 601         args.tfRegister[IDE_LCYL_OFFSET]        = SMART_LCYL_PASS;
 602         args.tfRegister[IDE_HCYL_OFFSET]        = SMART_HCYL_PASS;
 603         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SMART;
 604         args.command_type                       = IDE_DRIVE_TASK_IN;
 605         args.data_phase                         = TASKFILE_IN;
 606         args.handler                            = &task_in_intr;
 607         (void) smart_enable(drive);
 608         return ide_raw_taskfile(drive, &args, buf);
 609 }
 610
 611 static int proc_idedisk_read_cache
 612         (char *page, char **start, off_t off, int count, int *eof, void *data)
 613 {
 614         ide_drive_t     *drive = (ide_drive_t *) data;
 615         char            *out = page;
 616         int             len;
 617
 618         if (drive->id_read)
 619                 len = sprintf(out,"%i\n", drive->id->buf_size / 2);
 620         else
 621                 len = sprintf(out,"(none)\n");
 622         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 623 }
 624
 625 static int proc_idedisk_read_capacity
 626         (char *page, char **start, off_t off, int count, int *eof, void *data)
 627 {
 628         ide_drive_t*drive = (ide_drive_t *)data;
 629         int len;
 630
 631         len = sprintf(page,"%llu\n", (long long)idedisk_capacity(drive));
 632         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 633 }
 634
 635 static int proc_idedisk_read_smart_thresholds
 636         (char *page, char **start, off_t off, int count, int *eof, void *data)
 637 {
 638         ide_drive_t     *drive = (ide_drive_t *)data;
 639         int             len = 0, i = 0;
 640
 641         if (!get_smart_thresholds(drive, page)) {
 642                 unsigned short *val = (unsigned short *) page;
 643                 char *out = ((char *)val) + (SECTOR_WORDS * 4);
 644                 page = out;
 645                 do {
 646                         out += sprintf(out, "%04x%c", le16_to_cpu(*val), (++i & 7) ? ' ' : '\n');
 647                         val += 1;
 648                 } while (i < (SECTOR_WORDS * 2));
 649                 len = out - page;
 650         }
 651         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 652 }
 653
 654 static int proc_idedisk_read_smart_values
 655         (char *page, char **start, off_t off, int count, int *eof, void *data)
 656 {
 657         ide_drive_t     *drive = (ide_drive_t *)data;
 658         int             len = 0, i = 0;
 659
 660         if (!get_smart_values(drive, page)) {
 661                 unsigned short *val = (unsigned short *) page;
 662                 char *out = ((char *)val) + (SECTOR_WORDS * 4);
 663                 page = out;
 664                 do {
 665                         out += sprintf(out, "%04x%c", le16_to_cpu(*val), (++i & 7) ? ' ' : '\n');
 666                         val += 1;
 667                 } while (i < (SECTOR_WORDS * 2));
 668                 len = out - page;
 669         }
 670         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 671 }
 672
 673 static ide_proc_entry_t idedisk_proc[] = {
 674         { "cache",              S_IFREG|S_IRUGO,        proc_idedisk_read_cache,                NULL },
 675         { "capacity",           S_IFREG|S_IRUGO,        proc_idedisk_read_capacity,             NULL },
 676         { "geometry",           S_IFREG|S_IRUGO,        proc_ide_read_geometry,                 NULL },
 677         { "smart_values",       S_IFREG|S_IRUSR,        proc_idedisk_read_smart_values,         NULL },
 678         { "smart_thresholds",   S_IFREG|S_IRUSR,        proc_idedisk_read_smart_thresholds,     NULL },
 679         { NULL, 0, NULL, NULL }
 680 };
 681
 682 #else
 683
 684 #define idedisk_proc    NULL
 685
 686 #endif  /* CONFIG_PROC_FS */
 687
 688 static void idedisk_prepare_flush(request_queue_t *q, struct request *rq)
 689 {
 690         ide_drive_t *drive = q->queuedata;
 691
 692         memset(rq->cmd, 0, sizeof(rq->cmd));
 693
 694         if (ide_id_has_flush_cache_ext(drive->id) &&
 695             (drive->capacity64 >= (1UL << 28)))
 696                 rq->cmd[0] = WIN_FLUSH_CACHE_EXT;
 697         else
 698                 rq->cmd[0] = WIN_FLUSH_CACHE;
 699
 700
 701         rq->cmd_type = REQ_TYPE_ATA_TASK;
 702         rq->cmd_flags |= REQ_SOFTBARRIER;
 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.cmd_type = REQ_TYPE_ATA_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) && !drive->noflush &&
 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         idkp->openers++;
1084
1085         if (drive->removable && idkp->openers == 1) {
1086                 ide_task_t args;
1087                 memset(&args, 0, sizeof(ide_task_t));
1088                 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_DOORLOCK;
1089                 args.command_type = IDE_DRIVE_TASK_NO_DATA;
1090                 args.handler      = &task_no_data_intr;
1091                 check_disk_change(inode->i_bdev);
1092                 /*
1093                  * Ignore the return code from door_lock,
1094                  * since the open() has already succeeded,
1095                  * and the door_lock is irrelevant at this point.
1096                  */
1097                 if (drive->doorlocking && ide_raw_taskfile(drive, &args, NULL))
1098                         drive->doorlocking = 0;
1099         }
1100         return 0;
1101 }
1102
1103 static int idedisk_release(struct inode *inode, struct file *filp)
1104 {
1105         struct gendisk *disk = inode->i_bdev->bd_disk;
1106         struct ide_disk_obj *idkp = ide_disk_g(disk);
1107         ide_drive_t *drive = idkp->drive;
1108
1109         if (idkp->openers == 1)
1110                 ide_cacheflush_p(drive);
1111
1112         if (drive->removable && idkp->openers == 1) {
1113                 ide_task_t args;
1114                 memset(&args, 0, sizeof(ide_task_t));
1115                 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_DOORUNLOCK;
1116                 args.command_type = IDE_DRIVE_TASK_NO_DATA;
1117                 args.handler      = &task_no_data_intr;
1118                 if (drive->doorlocking && ide_raw_taskfile(drive, &args, NULL))
1119                         drive->doorlocking = 0;
1120         }
1121
1122         idkp->openers--;
1123
1124         ide_disk_put(idkp);
1125
1126         return 0;
1127 }
1128
1129 static int idedisk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1130 {
1131         struct ide_disk_obj *idkp = ide_disk_g(bdev->bd_disk);
1132         ide_drive_t *drive = idkp->drive;
1133
1134         geo->heads = drive->bios_head;
1135         geo->sectors = drive->bios_sect;
1136         geo->cylinders = (u16)drive->bios_cyl; /* truncate */
1137         return 0;
1138 }
1139
1140 static int idedisk_ioctl(struct inode *inode, struct file *file,
1141                         unsigned int cmd, unsigned long arg)
1142 {
1143         struct block_device *bdev = inode->i_bdev;
1144         struct ide_disk_obj *idkp = ide_disk_g(bdev->bd_disk);
1145         return generic_ide_ioctl(idkp->drive, file, bdev, cmd, arg);
1146 }
1147
1148 static int idedisk_media_changed(struct gendisk *disk)
1149 {
1150         struct ide_disk_obj *idkp = ide_disk_g(disk);
1151         ide_drive_t *drive = idkp->drive;
1152
1153         /* do not scan partitions twice if this is a removable device */
1154         if (drive->attach) {
1155                 drive->attach = 0;
1156                 return 0;
1157         }
1158         /* if removable, always assume it was changed */
1159         return drive->removable;
1160 }
1161
1162 static int idedisk_revalidate_disk(struct gendisk *disk)
1163 {
1164         struct ide_disk_obj *idkp = ide_disk_g(disk);
1165         set_capacity(disk, idedisk_capacity(idkp->drive));
1166         return 0;
1167 }
1168
1169 static struct block_device_operations idedisk_ops = {
1170         .owner          = THIS_MODULE,
1171         .open           = idedisk_open,
1172         .release        = idedisk_release,
1173         .ioctl          = idedisk_ioctl,
1174         .getgeo         = idedisk_getgeo,
1175         .media_changed  = idedisk_media_changed,
1176         .revalidate_disk= idedisk_revalidate_disk
1177 };
1178
1179 MODULE_DESCRIPTION("ATA DISK Driver");
1180
1181 static int ide_disk_probe(ide_drive_t *drive)
1182 {
1183         struct ide_disk_obj *idkp;
1184         struct gendisk *g;
1185
1186         /* strstr("foo", "") is non-NULL */
1187         if (!strstr("ide-disk", drive->driver_req))
1188                 goto failed;
1189         if (!drive->present)
1190                 goto failed;
1191         if (drive->media != ide_disk)
1192                 goto failed;
1193
1194         idkp = kzalloc(sizeof(*idkp), GFP_KERNEL);
1195         if (!idkp)
1196                 goto failed;
1197
1198         g = alloc_disk_node(1 << PARTN_BITS,
1199                         hwif_to_node(drive->hwif));
1200         if (!g)
1201                 goto out_free_idkp;
1202
1203         ide_init_disk(g, drive);
1204
1205         ide_register_subdriver(drive, &idedisk_driver);
1206
1207         kref_init(&idkp->kref);
1208
1209         idkp->drive = drive;
1210         idkp->driver = &idedisk_driver;
1211         idkp->disk = g;
1212
1213         g->private_data = &idkp->driver;
1214
1215         drive->driver_data = idkp;
1216
1217         idedisk_setup(drive);
1218         if ((!drive->head || drive->head > 16) && !drive->select.b.lba) {
1219                 printk(KERN_ERR "%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
1220                         drive->name, drive->head);
1221                 drive->attach = 0;
1222         } else
1223                 drive->attach = 1;
1224
1225         g->minors = 1 << PARTN_BITS;
1226         g->driverfs_dev = &drive->gendev;
1227         g->flags = drive->removable ? GENHD_FL_REMOVABLE : 0;
1228         set_capacity(g, idedisk_capacity(drive));
1229         g->fops = &idedisk_ops;
1230         add_disk(g);
1231         return 0;
1232
1233 out_free_idkp:
1234         kfree(idkp);
1235 failed:
1236         return -ENODEV;
1237 }
1238
1239 static void __exit idedisk_exit (void)
1240 {
1241         driver_unregister(&idedisk_driver.gen_driver);
1242 }
1243
1244 static int __init idedisk_init(void)
1245 {
1246         return driver_register(&idedisk_driver.gen_driver);
1247 }
1248
1249 MODULE_ALIAS("ide:*m-disk*");
1250 module_init(idedisk_init);
1251 module_exit(idedisk_exit);
1252 MODULE_LICENSE("GPL");