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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->host_flags & IDE_HFLAG_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_data(ide_drive_t *drive, u8 *buf, u8 sub_cmd)
 597 {
 598         ide_task_t args;
 599
 600         memset(&args, 0, sizeof(ide_task_t));
 601         args.tfRegister[IDE_FEATURE_OFFSET]     = sub_cmd;
 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 proc_idedisk_read_cache
 614         (char *page, char **start, off_t off, int count, int *eof, void *data)
 615 {
 616         ide_drive_t     *drive = (ide_drive_t *) data;
 617         char            *out = page;
 618         int             len;
 619
 620         if (drive->id_read)
 621                 len = sprintf(out,"%i\n", drive->id->buf_size / 2);
 622         else
 623                 len = sprintf(out,"(none)\n");
 624         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 625 }
 626
 627 static int proc_idedisk_read_capacity
 628         (char *page, char **start, off_t off, int count, int *eof, void *data)
 629 {
 630         ide_drive_t*drive = (ide_drive_t *)data;
 631         int len;
 632
 633         len = sprintf(page,"%llu\n", (long long)idedisk_capacity(drive));
 634         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 635 }
 636
 637 static int proc_idedisk_read_smart_thresholds
 638         (char *page, char **start, off_t off, int count, int *eof, void *data)
 639 {
 640         ide_drive_t     *drive = (ide_drive_t *)data;
 641         int             len = 0, i = 0;
 642
 643         if (get_smart_data(drive, page, SMART_READ_THRESHOLDS) == 0) {
 644                 unsigned short *val = (unsigned short *) page;
 645                 char *out = ((char *)val) + (SECTOR_WORDS * 4);
 646                 page = out;
 647                 do {
 648                         out += sprintf(out, "%04x%c", le16_to_cpu(*val), (++i & 7) ? ' ' : '\n');
 649                         val += 1;
 650                 } while (i < (SECTOR_WORDS * 2));
 651                 len = out - page;
 652         }
 653         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 654 }
 655
 656 static int proc_idedisk_read_smart_values
 657         (char *page, char **start, off_t off, int count, int *eof, void *data)
 658 {
 659         ide_drive_t     *drive = (ide_drive_t *)data;
 660         int             len = 0, i = 0;
 661
 662         if (get_smart_data(drive, page, SMART_READ_VALUES) == 0) {
 663                 unsigned short *val = (unsigned short *) page;
 664                 char *out = ((char *)val) + (SECTOR_WORDS * 4);
 665                 page = out;
 666                 do {
 667                         out += sprintf(out, "%04x%c", le16_to_cpu(*val), (++i & 7) ? ' ' : '\n');
 668                         val += 1;
 669                 } while (i < (SECTOR_WORDS * 2));
 670                 len = out - page;
 671         }
 672         PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
 673 }
 674
 675 static ide_proc_entry_t idedisk_proc[] = {
 676         { "cache",              S_IFREG|S_IRUGO,        proc_idedisk_read_cache,                NULL },
 677         { "capacity",           S_IFREG|S_IRUGO,        proc_idedisk_read_capacity,             NULL },
 678         { "geometry",           S_IFREG|S_IRUGO,        proc_ide_read_geometry,                 NULL },
 679         { "smart_values",       S_IFREG|S_IRUSR,        proc_idedisk_read_smart_values,         NULL },
 680         { "smart_thresholds",   S_IFREG|S_IRUSR,        proc_idedisk_read_smart_thresholds,     NULL },
 681         { NULL, 0, NULL, NULL }
 682 };
 683 #endif  /* CONFIG_IDE_PROC_FS */
 684
 685 static void idedisk_prepare_flush(struct request_queue *q, struct request *rq)
 686 {
 687         ide_drive_t *drive = q->queuedata;
 688
 689         memset(rq->cmd, 0, sizeof(rq->cmd));
 690
 691         if (ide_id_has_flush_cache_ext(drive->id) &&
 692             (drive->capacity64 >= (1UL << 28)))
 693                 rq->cmd[0] = WIN_FLUSH_CACHE_EXT;
 694         else
 695                 rq->cmd[0] = WIN_FLUSH_CACHE;
 696
 697
 698         rq->cmd_type = REQ_TYPE_ATA_TASK;
 699         rq->cmd_flags |= REQ_SOFTBARRIER;
 700         rq->buffer = rq->cmd;
 701 }
 702
 703 /*
 704  * This is tightly woven into the driver->do_special can not touch.
 705  * DON'T do it again until a total personality rewrite is committed.
 706  */
 707 static int set_multcount(ide_drive_t *drive, int arg)
 708 {
 709         struct request rq;
 710
 711         if (arg < 0 || arg > drive->id->max_multsect)
 712                 return -EINVAL;
 713
 714         if (drive->special.b.set_multmode)
 715                 return -EBUSY;
 716         ide_init_drive_cmd (&rq);
 717         rq.cmd_type = REQ_TYPE_ATA_CMD;
 718         drive->mult_req = arg;
 719         drive->special.b.set_multmode = 1;
 720         (void) ide_do_drive_cmd (drive, &rq, ide_wait);
 721         return (drive->mult_count == arg) ? 0 : -EIO;
 722 }
 723
 724 static int set_nowerr(ide_drive_t *drive, int arg)
 725 {
 726         if (arg < 0 || arg > 1)
 727                 return -EINVAL;
 728
 729         if (ide_spin_wait_hwgroup(drive))
 730                 return -EBUSY;
 731         drive->nowerr = arg;
 732         drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;
 733         spin_unlock_irq(&ide_lock);
 734         return 0;
 735 }
 736
 737 static void update_ordered(ide_drive_t *drive)
 738 {
 739         struct hd_driveid *id = drive->id;
 740         unsigned ordered = QUEUE_ORDERED_NONE;
 741         prepare_flush_fn *prep_fn = NULL;
 742
 743         if (drive->wcache) {
 744                 unsigned long long capacity;
 745                 int barrier;
 746                 /*
 747                  * We must avoid issuing commands a drive does not
 748                  * understand or we may crash it. We check flush cache
 749                  * is supported. We also check we have the LBA48 flush
 750                  * cache if the drive capacity is too large. By this
 751                  * time we have trimmed the drive capacity if LBA48 is
 752                  * not available so we don't need to recheck that.
 753                  */
 754                 capacity = idedisk_capacity(drive);
 755                 barrier = ide_id_has_flush_cache(id) && !drive->noflush &&
 756                         (drive->addressing == 0 || capacity <= (1ULL << 28) ||
 757                          ide_id_has_flush_cache_ext(id));
 758
 759                 printk(KERN_INFO "%s: cache flushes %ssupported\n",
 760                        drive->name, barrier ? "" : "not ");
 761
 762                 if (barrier) {
 763                         ordered = QUEUE_ORDERED_DRAIN_FLUSH;
 764                         prep_fn = idedisk_prepare_flush;
 765                 }
 766         } else
 767                 ordered = QUEUE_ORDERED_DRAIN;
 768
 769         blk_queue_ordered(drive->queue, ordered, prep_fn);
 770 }
 771
 772 static int write_cache(ide_drive_t *drive, int arg)
 773 {
 774         ide_task_t args;
 775         int err = 1;
 776
 777         if (arg < 0 || arg > 1)
 778                 return -EINVAL;
 779
 780         if (ide_id_has_flush_cache(drive->id)) {
 781                 memset(&args, 0, sizeof(ide_task_t));
 782                 args.tfRegister[IDE_FEATURE_OFFSET]     = (arg) ?
 783                         SETFEATURES_EN_WCACHE : SETFEATURES_DIS_WCACHE;
 784                 args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SETFEATURES;
 785                 args.command_type               = IDE_DRIVE_TASK_NO_DATA;
 786                 args.handler                    = &task_no_data_intr;
 787                 err = ide_raw_taskfile(drive, &args, NULL);
 788                 if (err == 0)
 789                         drive->wcache = arg;
 790         }
 791
 792         update_ordered(drive);
 793
 794         return err;
 795 }
 796
 797 static int do_idedisk_flushcache (ide_drive_t *drive)
 798 {
 799         ide_task_t args;
 800
 801         memset(&args, 0, sizeof(ide_task_t));
 802         if (ide_id_has_flush_cache_ext(drive->id))
 803                 args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_FLUSH_CACHE_EXT;
 804         else
 805                 args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_FLUSH_CACHE;
 806         args.command_type                       = IDE_DRIVE_TASK_NO_DATA;
 807         args.handler                            = &task_no_data_intr;
 808         return ide_raw_taskfile(drive, &args, NULL);
 809 }
 810
 811 static int set_acoustic (ide_drive_t *drive, int arg)
 812 {
 813         ide_task_t args;
 814
 815         if (arg < 0 || arg > 254)
 816                 return -EINVAL;
 817
 818         memset(&args, 0, sizeof(ide_task_t));
 819         args.tfRegister[IDE_FEATURE_OFFSET]     = (arg) ? SETFEATURES_EN_AAM :
 820                                                           SETFEATURES_DIS_AAM;
 821         args.tfRegister[IDE_NSECTOR_OFFSET]     = arg;
 822         args.tfRegister[IDE_COMMAND_OFFSET]     = WIN_SETFEATURES;
 823         args.command_type = IDE_DRIVE_TASK_NO_DATA;
 824         args.handler      = &task_no_data_intr;
 825         ide_raw_taskfile(drive, &args, NULL);
 826         drive->acoustic = arg;
 827         return 0;
 828 }
 829
 830 /*
 831  * drive->addressing:
 832  *      0: 28-bit
 833  *      1: 48-bit
 834  *      2: 48-bit capable doing 28-bit
 835  */
 836 static int set_lba_addressing(ide_drive_t *drive, int arg)
 837 {
 838         if (arg < 0 || arg > 2)
 839                 return -EINVAL;
 840
 841         drive->addressing =  0;
 842
 843         if (drive->hwif->host_flags & IDE_HFLAG_NO_LBA48)
 844                 return 0;
 845
 846         if (!idedisk_supports_lba48(drive->id))
 847                 return -EIO;
 848         drive->addressing = arg;
 849         return 0;
 850 }
 851
 852 #ifdef CONFIG_IDE_PROC_FS
 853 static void idedisk_add_settings(ide_drive_t *drive)
 854 {
 855         struct hd_driveid *id = drive->id;
 856
 857         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     TYPE_INT,       0,      65535,                  1,      1,      &drive->bios_cyl,       NULL);
 858         ide_add_setting(drive,  "bios_head",    SETTING_RW,     TYPE_BYTE,      0,      255,                    1,      1,      &drive->bios_head,      NULL);
 859         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     TYPE_BYTE,      0,      63,                     1,      1,      &drive->bios_sect,      NULL);
 860         ide_add_setting(drive,  "address",      SETTING_RW,     TYPE_BYTE,      0,      2,                      1,      1,      &drive->addressing,     set_lba_addressing);
 861         ide_add_setting(drive,  "bswap",        SETTING_READ,   TYPE_BYTE,      0,      1,                      1,      1,      &drive->bswap,          NULL);
 862         ide_add_setting(drive,  "multcount",    SETTING_RW,     TYPE_BYTE,      0,      id->max_multsect,       1,      1,      &drive->mult_count,     set_multcount);
 863         ide_add_setting(drive,  "nowerr",       SETTING_RW,     TYPE_BYTE,      0,      1,                      1,      1,      &drive->nowerr,         set_nowerr);
 864         ide_add_setting(drive,  "lun",          SETTING_RW,     TYPE_INT,       0,      7,                      1,      1,      &drive->lun,            NULL);
 865         ide_add_setting(drive,  "wcache",       SETTING_RW,     TYPE_BYTE,      0,      1,                      1,      1,      &drive->wcache,         write_cache);
 866         ide_add_setting(drive,  "acoustic",     SETTING_RW,     TYPE_BYTE,      0,      254,                    1,      1,      &drive->acoustic,       set_acoustic);
 867         ide_add_setting(drive,  "failures",     SETTING_RW,     TYPE_INT,       0,      65535,                  1,      1,      &drive->failures,       NULL);
 868         ide_add_setting(drive,  "max_failures", SETTING_RW,     TYPE_INT,       0,      65535,                  1,      1,      &drive->max_failures,   NULL);
 869 }
 870 #else
 871 static inline void idedisk_add_settings(ide_drive_t *drive) { ; }
 872 #endif
 873
 874 static void idedisk_setup (ide_drive_t *drive)
 875 {
 876         ide_hwif_t *hwif = drive->hwif;
 877         struct hd_driveid *id = drive->id;
 878         unsigned long long capacity;
 879
 880         idedisk_add_settings(drive);
 881
 882         if (drive->id_read == 0)
 883                 return;
 884
 885         if (drive->removable) {
 886                 /*
 887                  * Removable disks (eg. SYQUEST); ignore 'WD' drives
 888                  */
 889                 if (id->model[0] != 'W' || id->model[1] != 'D') {
 890                         drive->doorlocking = 1;
 891                 }
 892         }
 893
 894         (void)set_lba_addressing(drive, 1);
 895
 896         if (drive->addressing == 1) {
 897                 int max_s = 2048;
 898
 899                 if (max_s > hwif->rqsize)
 900                         max_s = hwif->rqsize;
 901
 902                 blk_queue_max_sectors(drive->queue, max_s);
 903         }
 904
 905         printk(KERN_INFO "%s: max request size: %dKiB\n", drive->name, drive->queue->max_sectors / 2);
 906
 907         /* calculate drive capacity, and select LBA if possible */
 908         init_idedisk_capacity (drive);
 909
 910         /* limit drive capacity to 137GB if LBA48 cannot be used */
 911         if (drive->addressing == 0 && drive->capacity64 > 1ULL << 28) {
 912                 printk(KERN_WARNING "%s: cannot use LBA48 - full capacity "
 913                        "%llu sectors (%llu MB)\n",
 914                        drive->name, (unsigned long long)drive->capacity64,
 915                        sectors_to_MB(drive->capacity64));
 916                 drive->capacity64 = 1ULL << 28;
 917         }
 918
 919         if ((hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA) && drive->addressing) {
 920                 if (drive->capacity64 > 1ULL << 28) {
 921                         printk(KERN_INFO "%s: cannot use LBA48 DMA - PIO mode will"
 922                                          " be used for accessing sectors > %u\n",
 923                                          drive->name, 1 << 28);
 924                 } else
 925                         drive->addressing = 0;
 926         }
 927
 928         /*
 929          * if possible, give fdisk access to more of the drive,
 930          * by correcting bios_cyls:
 931          */
 932         capacity = idedisk_capacity (drive);
 933         if (!drive->forced_geom) {
 934
 935                 if (idedisk_supports_lba48(drive->id)) {
 936                         /* compatibility */
 937                         drive->bios_sect = 63;
 938                         drive->bios_head = 255;
 939                 }
 940
 941                 if (drive->bios_sect && drive->bios_head) {
 942                         unsigned int cap0 = capacity; /* truncate to 32 bits */
 943                         unsigned int cylsz, cyl;
 944
 945                         if (cap0 != capacity)
 946                                 drive->bios_cyl = 65535;
 947                         else {
 948                                 cylsz = drive->bios_sect * drive->bios_head;
 949                                 cyl = cap0 / cylsz;
 950                                 if (cyl > 65535)
 951                                         cyl = 65535;
 952                                 if (cyl > drive->bios_cyl)
 953                                         drive->bios_cyl = cyl;
 954                         }
 955                 }
 956         }
 957         printk(KERN_INFO "%s: %llu sectors (%llu MB)",
 958                          drive->name, capacity, sectors_to_MB(capacity));
 959
 960         /* Only print cache size when it was specified */
 961         if (id->buf_size)
 962                 printk (" w/%dKiB Cache", id->buf_size/2);
 963
 964         printk(KERN_CONT ", CHS=%d/%d/%d\n",
 965                          drive->bios_cyl, drive->bios_head, drive->bios_sect);
 966
 967         /* write cache enabled? */
 968         if ((id->csfo & 1) || (id->cfs_enable_1 & (1 << 5)))
 969                 drive->wcache = 1;
 970
 971         write_cache(drive, 1);
 972 }
 973
 974 static void ide_cacheflush_p(ide_drive_t *drive)
 975 {
 976         if (!drive->wcache || !ide_id_has_flush_cache(drive->id))
 977                 return;
 978
 979         if (do_idedisk_flushcache(drive))
 980                 printk(KERN_INFO "%s: wcache flush failed!\n", drive->name);
 981 }
 982
 983 static void ide_disk_remove(ide_drive_t *drive)
 984 {
 985         struct ide_disk_obj *idkp = drive->driver_data;
 986         struct gendisk *g = idkp->disk;
 987
 988         ide_proc_unregister_driver(drive, idkp->driver);
 989
 990         del_gendisk(g);
 991
 992         ide_cacheflush_p(drive);
 993
 994         ide_disk_put(idkp);
 995 }
 996
 997 static void ide_disk_release(struct kref *kref)
 998 {
 999         struct ide_disk_obj *idkp = to_ide_disk(kref);
1000         ide_drive_t *drive = idkp->drive;
1001         struct gendisk *g = idkp->disk;
1002
1003         drive->driver_data = NULL;
1004         g->private_data = NULL;
1005         put_disk(g);
1006         kfree(idkp);
1007 }
1008
1009 static int ide_disk_probe(ide_drive_t *drive);
1010
1011 /*
1012  * On HPA drives the capacity needs to be
1013  * reinitilized on resume otherwise the disk
1014  * can not be used and a hard reset is required
1015  */
1016 static void ide_disk_resume(ide_drive_t *drive)
1017 {
1018         if (idedisk_supports_hpa(drive->id))
1019                 init_idedisk_capacity(drive);
1020 }
1021
1022 static void ide_device_shutdown(ide_drive_t *drive)
1023 {
1024 #ifdef  CONFIG_ALPHA
1025         /* On Alpha, halt(8) doesn't actually turn the machine off,
1026            it puts you into the sort of firmware monitor. Typically,
1027            it's used to boot another kernel image, so it's not much
1028            different from reboot(8). Therefore, we don't need to
1029            spin down the disk in this case, especially since Alpha
1030            firmware doesn't handle disks in standby mode properly.
1031            On the other hand, it's reasonably safe to turn the power
1032            off when the shutdown process reaches the firmware prompt,
1033            as the firmware initialization takes rather long time -
1034            at least 10 seconds, which should be sufficient for
1035            the disk to expire its write cache. */
1036         if (system_state != SYSTEM_POWER_OFF) {
1037 #else
1038         if (system_state == SYSTEM_RESTART) {
1039 #endif
1040                 ide_cacheflush_p(drive);
1041                 return;
1042         }
1043
1044         printk("Shutdown: %s\n", drive->name);
1045         drive->gendev.bus->suspend(&drive->gendev, PMSG_SUSPEND);
1046 }
1047
1048 static ide_driver_t idedisk_driver = {
1049         .gen_driver = {
1050                 .owner          = THIS_MODULE,
1051                 .name           = "ide-disk",
1052                 .bus            = &ide_bus_type,
1053         },
1054         .probe                  = ide_disk_probe,
1055         .remove                 = ide_disk_remove,
1056         .resume                 = ide_disk_resume,
1057         .shutdown               = ide_device_shutdown,
1058         .version                = IDEDISK_VERSION,
1059         .media                  = ide_disk,
1060         .supports_dsc_overlap   = 0,
1061         .do_request             = ide_do_rw_disk,
1062         .end_request            = ide_end_request,
1063         .error                  = __ide_error,
1064         .abort                  = __ide_abort,
1065 #ifdef CONFIG_IDE_PROC_FS
1066         .proc                   = idedisk_proc,
1067 #endif
1068 };
1069
1070 static int idedisk_open(struct inode *inode, struct file *filp)
1071 {
1072         struct gendisk *disk = inode->i_bdev->bd_disk;
1073         struct ide_disk_obj *idkp;
1074         ide_drive_t *drive;
1075
1076         if (!(idkp = ide_disk_get(disk)))
1077                 return -ENXIO;
1078
1079         drive = idkp->drive;
1080
1081         idkp->openers++;
1082
1083         if (drive->removable && idkp->openers == 1) {
1084                 ide_task_t args;
1085                 memset(&args, 0, sizeof(ide_task_t));
1086                 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_DOORLOCK;
1087                 args.command_type = IDE_DRIVE_TASK_NO_DATA;
1088                 args.handler      = &task_no_data_intr;
1089                 check_disk_change(inode->i_bdev);
1090                 /*
1091                  * Ignore the return code from door_lock,
1092                  * since the open() has already succeeded,
1093                  * and the door_lock is irrelevant at this point.
1094                  */
1095                 if (drive->doorlocking && ide_raw_taskfile(drive, &args, NULL))
1096                         drive->doorlocking = 0;
1097         }
1098         return 0;
1099 }
1100
1101 static int idedisk_release(struct inode *inode, struct file *filp)
1102 {
1103         struct gendisk *disk = inode->i_bdev->bd_disk;
1104         struct ide_disk_obj *idkp = ide_disk_g(disk);
1105         ide_drive_t *drive = idkp->drive;
1106
1107         if (idkp->openers == 1)
1108                 ide_cacheflush_p(drive);
1109
1110         if (drive->removable && idkp->openers == 1) {
1111                 ide_task_t args;
1112                 memset(&args, 0, sizeof(ide_task_t));
1113                 args.tfRegister[IDE_COMMAND_OFFSET] = WIN_DOORUNLOCK;
1114                 args.command_type = IDE_DRIVE_TASK_NO_DATA;
1115                 args.handler      = &task_no_data_intr;
1116                 if (drive->doorlocking && ide_raw_taskfile(drive, &args, NULL))
1117                         drive->doorlocking = 0;
1118         }
1119
1120         idkp->openers--;
1121
1122         ide_disk_put(idkp);
1123
1124         return 0;
1125 }
1126
1127 static int idedisk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1128 {
1129         struct ide_disk_obj *idkp = ide_disk_g(bdev->bd_disk);
1130         ide_drive_t *drive = idkp->drive;
1131
1132         geo->heads = drive->bios_head;
1133         geo->sectors = drive->bios_sect;
1134         geo->cylinders = (u16)drive->bios_cyl; /* truncate */
1135         return 0;
1136 }
1137
1138 static int idedisk_ioctl(struct inode *inode, struct file *file,
1139                         unsigned int cmd, unsigned long arg)
1140 {
1141         unsigned long flags;
1142         struct block_device *bdev = inode->i_bdev;
1143         struct ide_disk_obj *idkp = ide_disk_g(bdev->bd_disk);
1144         ide_drive_t *drive = idkp->drive;
1145         int err, (*setfunc)(ide_drive_t *, int);
1146         u8 *val;
1147
1148         switch (cmd) {
1149         case HDIO_GET_ADDRESS:   val = &drive->addressing;      goto read_val;
1150         case HDIO_GET_MULTCOUNT: val = &drive->mult_count;      goto read_val;
1151         case HDIO_GET_NOWERR:    val = &drive->nowerr;          goto read_val;
1152         case HDIO_GET_WCACHE:    val = &drive->wcache;          goto read_val;
1153         case HDIO_GET_ACOUSTIC:  val = &drive->acoustic;        goto read_val;
1154         case HDIO_SET_ADDRESS:   setfunc = set_lba_addressing;  goto set_val;
1155         case HDIO_SET_MULTCOUNT: setfunc = set_multcount;       goto set_val;
1156         case HDIO_SET_NOWERR:    setfunc = set_nowerr;          goto set_val;
1157         case HDIO_SET_WCACHE:    setfunc = write_cache;         goto set_val;
1158         case HDIO_SET_ACOUSTIC:  setfunc = set_acoustic;        goto set_val;
1159         }
1160
1161         return generic_ide_ioctl(drive, file, bdev, cmd, arg);
1162
1163 read_val:
1164         mutex_lock(&ide_setting_mtx);
1165         spin_lock_irqsave(&ide_lock, flags);
1166         err = *val;
1167         spin_unlock_irqrestore(&ide_lock, flags);
1168         mutex_unlock(&ide_setting_mtx);
1169         return err >= 0 ? put_user(err, (long __user *)arg) : err;
1170
1171 set_val:
1172         if (bdev != bdev->bd_contains)
1173                 err = -EINVAL;
1174         else {
1175                 if (!capable(CAP_SYS_ADMIN))
1176                         err = -EACCES;
1177                 else {
1178                         mutex_lock(&ide_setting_mtx);
1179                         err = setfunc(drive, arg);
1180                         mutex_unlock(&ide_setting_mtx);
1181                 }
1182         }
1183         return err;
1184 }
1185
1186 static int idedisk_media_changed(struct gendisk *disk)
1187 {
1188         struct ide_disk_obj *idkp = ide_disk_g(disk);
1189         ide_drive_t *drive = idkp->drive;
1190
1191         /* do not scan partitions twice if this is a removable device */
1192         if (drive->attach) {
1193                 drive->attach = 0;
1194                 return 0;
1195         }
1196         /* if removable, always assume it was changed */
1197         return drive->removable;
1198 }
1199
1200 static int idedisk_revalidate_disk(struct gendisk *disk)
1201 {
1202         struct ide_disk_obj *idkp = ide_disk_g(disk);
1203         set_capacity(disk, idedisk_capacity(idkp->drive));
1204         return 0;
1205 }
1206
1207 static struct block_device_operations idedisk_ops = {
1208         .owner          = THIS_MODULE,
1209         .open           = idedisk_open,
1210         .release        = idedisk_release,
1211         .ioctl          = idedisk_ioctl,
1212         .getgeo         = idedisk_getgeo,
1213         .media_changed  = idedisk_media_changed,
1214         .revalidate_disk= idedisk_revalidate_disk
1215 };
1216
1217 MODULE_DESCRIPTION("ATA DISK Driver");
1218
1219 static int ide_disk_probe(ide_drive_t *drive)
1220 {
1221         struct ide_disk_obj *idkp;
1222         struct gendisk *g;
1223
1224         /* strstr("foo", "") is non-NULL */
1225         if (!strstr("ide-disk", drive->driver_req))
1226                 goto failed;
1227         if (!drive->present)
1228                 goto failed;
1229         if (drive->media != ide_disk)
1230                 goto failed;
1231
1232         idkp = kzalloc(sizeof(*idkp), GFP_KERNEL);
1233         if (!idkp)
1234                 goto failed;
1235
1236         g = alloc_disk_node(1 << PARTN_BITS,
1237                         hwif_to_node(drive->hwif));
1238         if (!g)
1239                 goto out_free_idkp;
1240
1241         ide_init_disk(g, drive);
1242
1243         ide_proc_register_driver(drive, &idedisk_driver);
1244
1245         kref_init(&idkp->kref);
1246
1247         idkp->drive = drive;
1248         idkp->driver = &idedisk_driver;
1249         idkp->disk = g;
1250
1251         g->private_data = &idkp->driver;
1252
1253         drive->driver_data = idkp;
1254
1255         idedisk_setup(drive);
1256         if ((!drive->head || drive->head > 16) && !drive->select.b.lba) {
1257                 printk(KERN_ERR "%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
1258                         drive->name, drive->head);
1259                 drive->attach = 0;
1260         } else
1261                 drive->attach = 1;
1262
1263         g->minors = 1 << PARTN_BITS;
1264         g->driverfs_dev = &drive->gendev;
1265         g->flags = drive->removable ? GENHD_FL_REMOVABLE : 0;
1266         set_capacity(g, idedisk_capacity(drive));
1267         g->fops = &idedisk_ops;
1268         add_disk(g);
1269         return 0;
1270
1271 out_free_idkp:
1272         kfree(idkp);
1273 failed:
1274         return -ENODEV;
1275 }
1276
1277 static void __exit idedisk_exit (void)
1278 {
1279         driver_unregister(&idedisk_driver.gen_driver);
1280 }
1281
1282 static int __init idedisk_init(void)
1283 {
1284         return driver_register(&idedisk_driver.gen_driver);
1285 }
1286
1287 MODULE_ALIAS("ide:*m-disk*");
1288 module_init(idedisk_init);
1289 module_exit(idedisk_exit);
1290 MODULE_LICENSE("GPL");