drivers/ide/ide-lib.c

   1 #include <linux/module.h>
   2 #include <linux/types.h>
   3 #include <linux/string.h>
   4 #include <linux/kernel.h>
   5 #include <linux/timer.h>
   6 #include <linux/mm.h>
   7 #include <linux/interrupt.h>
   8 #include <linux/major.h>
   9 #include <linux/errno.h>
  10 #include <linux/genhd.h>
  11 #include <linux/blkpg.h>
  12 #include <linux/slab.h>
  13 #include <linux/pci.h>
  14 #include <linux/delay.h>
  15 #include <linux/hdreg.h>
  16 #include <linux/ide.h>
  17 #include <linux/bitops.h>
  18
  19 #include <asm/byteorder.h>
  20 #include <asm/irq.h>
  21 #include <asm/uaccess.h>
  22 #include <asm/io.h>
  23
  24 /*
  25  *      IDE library routines. These are plug in code that most
  26  *      drivers can use but occasionally may be weird enough
  27  *      to want to do their own thing with
  28  *
  29  *      Add common non I/O op stuff here. Make sure it has proper
  30  *      kernel-doc function headers or your patch will be rejected
  31  */
  32
  33
  34 /**
  35  *      ide_xfer_verbose        -       return IDE mode names
  36  *      @xfer_rate: rate to name
  37  *
  38  *      Returns a constant string giving the name of the mode
  39  *      requested.
  40  */
  41
  42 char *ide_xfer_verbose (u8 xfer_rate)
  43 {
  44         switch(xfer_rate) {
  45                 case XFER_UDMA_7:       return("UDMA 7");
  46                 case XFER_UDMA_6:       return("UDMA 6");
  47                 case XFER_UDMA_5:       return("UDMA 5");
  48                 case XFER_UDMA_4:       return("UDMA 4");
  49                 case XFER_UDMA_3:       return("UDMA 3");
  50                 case XFER_UDMA_2:       return("UDMA 2");
  51                 case XFER_UDMA_1:       return("UDMA 1");
  52                 case XFER_UDMA_0:       return("UDMA 0");
  53                 case XFER_MW_DMA_2:     return("MW DMA 2");
  54                 case XFER_MW_DMA_1:     return("MW DMA 1");
  55                 case XFER_MW_DMA_0:     return("MW DMA 0");
  56                 case XFER_SW_DMA_2:     return("SW DMA 2");
  57                 case XFER_SW_DMA_1:     return("SW DMA 1");
  58                 case XFER_SW_DMA_0:     return("SW DMA 0");
  59                 case XFER_PIO_4:        return("PIO 4");
  60                 case XFER_PIO_3:        return("PIO 3");
  61                 case XFER_PIO_2:        return("PIO 2");
  62                 case XFER_PIO_1:        return("PIO 1");
  63                 case XFER_PIO_0:        return("PIO 0");
  64                 case XFER_PIO_SLOW:     return("PIO SLOW");
  65                 default:                return("XFER ERROR");
  66         }
  67 }
  68
  69 EXPORT_SYMBOL(ide_xfer_verbose);
  70
  71 /**
  72  *      ide_rate_filter         -       filter transfer mode
  73  *      @drive: IDE device
  74  *      @speed: desired speed
  75  *
  76  *      Given the available transfer modes this function returns
  77  *      the best available speed at or below the speed requested.
  78  *
  79  *      TODO: check device PIO capabilities
  80  */
  81
  82 static u8 ide_rate_filter(ide_drive_t *drive, u8 speed)
  83 {
  84         ide_hwif_t *hwif = drive->hwif;
  85         u8 mode = ide_find_dma_mode(drive, speed);
  86
  87         if (mode == 0) {
  88                 if (hwif->pio_mask)
  89                         mode = fls(hwif->pio_mask) - 1 + XFER_PIO_0;
  90                 else
  91                         mode = XFER_PIO_4;
  92         }
  93
  94 //      printk("%s: mode 0x%02x, speed 0x%02x\n", __FUNCTION__, mode, speed);
  95
  96         return min(speed, mode);
  97 }
  98
  99 /*
 100  * Standard (generic) timings for PIO modes, from ATA2 specification.
 101  * These timings are for access to the IDE data port register *only*.
 102  * Some drives may specify a mode, while also specifying a different
 103  * value for cycle_time (from drive identification data).
 104  */
 105 const ide_pio_timings_t ide_pio_timings[6] = {
 106         { 70,   165,    600 },  /* PIO Mode 0 */
 107         { 50,   125,    383 },  /* PIO Mode 1 */
 108         { 30,   100,    240 },  /* PIO Mode 2 */
 109         { 30,   80,     180 },  /* PIO Mode 3 with IORDY */
 110         { 25,   70,     120 },  /* PIO Mode 4 with IORDY */
 111         { 20,   50,     100 }   /* PIO Mode 5 with IORDY (nonstandard) */
 112 };
 113
 114 EXPORT_SYMBOL_GPL(ide_pio_timings);
 115
 116 /*
 117  * Shared data/functions for determining best PIO mode for an IDE drive.
 118  * Most of this stuff originally lived in cmd640.c, and changes to the
 119  * ide_pio_blacklist[] table should be made with EXTREME CAUTION to avoid
 120  * breaking the fragile cmd640.c support.
 121  */
 122
 123 /*
 124  * Black list. Some drives incorrectly report their maximal PIO mode,
 125  * at least in respect to CMD640. Here we keep info on some known drives.
 126  */
 127 static struct ide_pio_info {
 128         const char      *name;
 129         int             pio;
 130 } ide_pio_blacklist [] = {
 131 /*      { "Conner Peripherals 1275MB - CFS1275A", 4 }, */
 132         { "Conner Peripherals 540MB - CFS540A", 3 },
 133
 134         { "WDC AC2700",  3 },
 135         { "WDC AC2540",  3 },
 136         { "WDC AC2420",  3 },
 137         { "WDC AC2340",  3 },
 138         { "WDC AC2250",  0 },
 139         { "WDC AC2200",  0 },
 140         { "WDC AC21200", 4 },
 141         { "WDC AC2120",  0 },
 142         { "WDC AC2850",  3 },
 143         { "WDC AC1270",  3 },
 144         { "WDC AC1170",  1 },
 145         { "WDC AC1210",  1 },
 146         { "WDC AC280",   0 },
 147 /*      { "WDC AC21000", 4 }, */
 148         { "WDC AC31000", 3 },
 149         { "WDC AC31200", 3 },
 150 /*      { "WDC AC31600", 4 }, */
 151
 152         { "Maxtor 7131 AT", 1 },
 153         { "Maxtor 7171 AT", 1 },
 154         { "Maxtor 7213 AT", 1 },
 155         { "Maxtor 7245 AT", 1 },
 156         { "Maxtor 7345 AT", 1 },
 157         { "Maxtor 7546 AT", 3 },
 158         { "Maxtor 7540 AV", 3 },
 159
 160         { "SAMSUNG SHD-3121A", 1 },
 161         { "SAMSUNG SHD-3122A", 1 },
 162         { "SAMSUNG SHD-3172A", 1 },
 163
 164 /*      { "ST51080A", 4 },
 165  *      { "ST51270A", 4 },
 166  *      { "ST31220A", 4 },
 167  *      { "ST31640A", 4 },
 168  *      { "ST32140A", 4 },
 169  *      { "ST3780A",  4 },
 170  */
 171         { "ST5660A",  3 },
 172         { "ST3660A",  3 },
 173         { "ST3630A",  3 },
 174         { "ST3655A",  3 },
 175         { "ST3391A",  3 },
 176         { "ST3390A",  1 },
 177         { "ST3600A",  1 },
 178         { "ST3290A",  0 },
 179         { "ST3144A",  0 },
 180         { "ST3491A",  1 },      /* reports 3, should be 1 or 2 (depending on */
 181                                 /* drive) according to Seagates FIND-ATA program */
 182
 183         { "QUANTUM ELS127A", 0 },
 184         { "QUANTUM ELS170A", 0 },
 185         { "QUANTUM LPS240A", 0 },
 186         { "QUANTUM LPS210A", 3 },
 187         { "QUANTUM LPS270A", 3 },
 188         { "QUANTUM LPS365A", 3 },
 189         { "QUANTUM LPS540A", 3 },
 190         { "QUANTUM LIGHTNING 540A", 3 },
 191         { "QUANTUM LIGHTNING 730A", 3 },
 192
 193         { "QUANTUM FIREBALL_540", 3 }, /* Older Quantum Fireballs don't work */
 194         { "QUANTUM FIREBALL_640", 3 },
 195         { "QUANTUM FIREBALL_1080", 3 },
 196         { "QUANTUM FIREBALL_1280", 3 },
 197         { NULL, 0 }
 198 };
 199
 200 /**
 201  *      ide_scan_pio_blacklist  -       check for a blacklisted drive
 202  *      @model: Drive model string
 203  *
 204  *      This routine searches the ide_pio_blacklist for an entry
 205  *      matching the start/whole of the supplied model name.
 206  *
 207  *      Returns -1 if no match found.
 208  *      Otherwise returns the recommended PIO mode from ide_pio_blacklist[].
 209  */
 210
 211 static int ide_scan_pio_blacklist (char *model)
 212 {
 213         struct ide_pio_info *p;
 214
 215         for (p = ide_pio_blacklist; p->name != NULL; p++) {
 216                 if (strncmp(p->name, model, strlen(p->name)) == 0)
 217                         return p->pio;
 218         }
 219         return -1;
 220 }
 221
 222 unsigned int ide_pio_cycle_time(ide_drive_t *drive, u8 pio)
 223 {
 224         struct hd_driveid *id = drive->id;
 225         int cycle_time = 0;
 226
 227         if (id->field_valid & 2) {
 228                 if (id->capability & 8)
 229                         cycle_time = id->eide_pio_iordy;
 230                 else
 231                         cycle_time = id->eide_pio;
 232         }
 233
 234         /* conservative "downgrade" for all pre-ATA2 drives */
 235         if (pio < 3) {
 236                 if (cycle_time && cycle_time < ide_pio_timings[pio].cycle_time)
 237                         cycle_time = 0; /* use standard timing */
 238         }
 239
 240         return cycle_time ? cycle_time : ide_pio_timings[pio].cycle_time;
 241 }
 242
 243 EXPORT_SYMBOL_GPL(ide_pio_cycle_time);
 244
 245 /**
 246  *      ide_get_best_pio_mode   -       get PIO mode from drive
 247  *      @drive: drive to consider
 248  *      @mode_wanted: preferred mode
 249  *      @max_mode: highest allowed mode
 250  *
 251  *      This routine returns the recommended PIO settings for a given drive,
 252  *      based on the drive->id information and the ide_pio_blacklist[].
 253  *
 254  *      Drive PIO mode is auto-selected if 255 is passed as mode_wanted.
 255  *      This is used by most chipset support modules when "auto-tuning".
 256  */
 257
 258 u8 ide_get_best_pio_mode (ide_drive_t *drive, u8 mode_wanted, u8 max_mode)
 259 {
 260         int pio_mode;
 261         struct hd_driveid* id = drive->id;
 262         int overridden  = 0;
 263
 264         if (mode_wanted != 255)
 265                 return min_t(u8, mode_wanted, max_mode);
 266
 267         if ((drive->hwif->host_flags & IDE_HFLAG_PIO_NO_BLACKLIST) == 0 &&
 268             (pio_mode = ide_scan_pio_blacklist(id->model)) != -1) {
 269                 printk(KERN_INFO "%s: is on PIO blacklist\n", drive->name);
 270         } else {
 271                 pio_mode = id->tPIO;
 272                 if (pio_mode > 2) {     /* 2 is maximum allowed tPIO value */
 273                         pio_mode = 2;
 274                         overridden = 1;
 275                 }
 276                 if (id->field_valid & 2) {        /* drive implements ATA2? */
 277                         if (id->capability & 8) { /* IORDY supported? */
 278                                 if (id->eide_pio_modes & 7) {
 279                                         overridden = 0;
 280                                         if (id->eide_pio_modes & 4)
 281                                                 pio_mode = 5;
 282                                         else if (id->eide_pio_modes & 2)
 283                                                 pio_mode = 4;
 284                                         else
 285                                                 pio_mode = 3;
 286                                 }
 287                         }
 288                 }
 289
 290                 if (overridden)
 291                         printk(KERN_INFO "%s: tPIO > 2, assuming tPIO = 2\n",
 292                                          drive->name);
 293
 294                 /*
 295                  * Conservative "downgrade" for all pre-ATA2 drives
 296                  */
 297                 if ((drive->hwif->host_flags & IDE_HFLAG_PIO_NO_DOWNGRADE) == 0 &&
 298                     pio_mode && pio_mode < 4) {
 299                         pio_mode--;
 300                         printk(KERN_INFO "%s: applying conservative "
 301                                          "PIO \"downgrade\"\n", drive->name);
 302                 }
 303         }
 304
 305         if (pio_mode > max_mode)
 306                 pio_mode = max_mode;
 307
 308         return pio_mode;
 309 }
 310
 311 EXPORT_SYMBOL_GPL(ide_get_best_pio_mode);
 312
 313 /* req_pio == "255" for auto-tune */
 314 void ide_set_pio(ide_drive_t *drive, u8 req_pio)
 315 {
 316         ide_hwif_t *hwif = drive->hwif;
 317         u8 host_pio, pio;
 318
 319         if (hwif->set_pio_mode == NULL)
 320                 return;
 321
 322         BUG_ON(hwif->pio_mask == 0x00);
 323
 324         host_pio = fls(hwif->pio_mask) - 1;
 325
 326         pio = ide_get_best_pio_mode(drive, req_pio, host_pio);
 327
 328         /*
 329          * TODO:
 330          * - report device max PIO mode
 331          * - check req_pio != 255 against device max PIO mode
 332          */
 333         printk(KERN_DEBUG "%s: host max PIO%d wanted PIO%d%s selected PIO%d\n",
 334                           drive->name, host_pio, req_pio,
 335                           req_pio == 255 ? "(auto-tune)" : "", pio);
 336
 337         (void)ide_set_pio_mode(drive, XFER_PIO_0 + pio);
 338 }
 339
 340 EXPORT_SYMBOL_GPL(ide_set_pio);
 341
 342 /**
 343  *      ide_toggle_bounce       -       handle bounce buffering
 344  *      @drive: drive to update
 345  *      @on: on/off boolean
 346  *
 347  *      Enable or disable bounce buffering for the device. Drives move
 348  *      between PIO and DMA and that changes the rules we need.
 349  */
 350
 351 void ide_toggle_bounce(ide_drive_t *drive, int on)
 352 {
 353         u64 addr = BLK_BOUNCE_HIGH;     /* dma64_addr_t */
 354
 355         if (!PCI_DMA_BUS_IS_PHYS) {
 356                 addr = BLK_BOUNCE_ANY;
 357         } else if (on && drive->media == ide_disk) {
 358                 if (HWIF(drive)->pci_dev)
 359                         addr = HWIF(drive)->pci_dev->dma_mask;
 360         }
 361
 362         if (drive->queue)
 363                 blk_queue_bounce_limit(drive->queue, addr);
 364 }
 365
 366 int ide_set_pio_mode(ide_drive_t *drive, const u8 mode)
 367 {
 368         ide_hwif_t *hwif = drive->hwif;
 369
 370         if (hwif->set_pio_mode == NULL)
 371                 return -1;
 372
 373         /*
 374          * TODO: temporary hack for some legacy host drivers that didn't
 375          * set transfer mode on the device in ->set_pio_mode method...
 376          */
 377         if (hwif->set_dma_mode == NULL) {
 378                 hwif->set_pio_mode(drive, mode - XFER_PIO_0);
 379                 return 0;
 380         }
 381
 382         if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
 383                 if (ide_config_drive_speed(drive, mode))
 384                         return -1;
 385                 hwif->set_pio_mode(drive, mode - XFER_PIO_0);
 386                 return 0;
 387         } else {
 388                 hwif->set_pio_mode(drive, mode - XFER_PIO_0);
 389                 return ide_config_drive_speed(drive, mode);
 390         }
 391 }
 392
 393 int ide_set_dma_mode(ide_drive_t *drive, const u8 mode)
 394 {
 395         ide_hwif_t *hwif = drive->hwif;
 396
 397         if (hwif->set_dma_mode == NULL)
 398                 return -1;
 399
 400         if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
 401                 if (ide_config_drive_speed(drive, mode))
 402                         return -1;
 403                 hwif->set_dma_mode(drive, mode);
 404                 return 0;
 405         } else {
 406                 hwif->set_dma_mode(drive, mode);
 407                 return ide_config_drive_speed(drive, mode);
 408         }
 409 }
 410
 411 EXPORT_SYMBOL_GPL(ide_set_dma_mode);
 412
 413 /**
 414  *      ide_set_xfer_rate       -       set transfer rate
 415  *      @drive: drive to set
 416  *      @rate: speed to attempt to set
 417  *
 418  *      General helper for setting the speed of an IDE device. This
 419  *      function knows about user enforced limits from the configuration
 420  *      which ->set_pio_mode/->set_dma_mode does not.
 421  */
 422
 423 int ide_set_xfer_rate(ide_drive_t *drive, u8 rate)
 424 {
 425         ide_hwif_t *hwif = drive->hwif;
 426
 427         if (hwif->set_dma_mode == NULL)
 428                 return -1;
 429
 430         rate = ide_rate_filter(drive, rate);
 431
 432         if (rate >= XFER_PIO_0 && rate <= XFER_PIO_5)
 433                 return ide_set_pio_mode(drive, rate);
 434
 435         /*
 436          * TODO: transfer modes 0x00-0x07 passed from the user-space are
 437          * currently handled here which needs fixing (please note that such
 438          * case could happen iff the transfer mode has already been set on
 439          * the device by ide-proc.c::set_xfer_rate()).
 440          */
 441
 442         return ide_set_dma_mode(drive, rate);
 443 }
 444
 445 static void ide_dump_opcode(ide_drive_t *drive)
 446 {
 447         struct request *rq;
 448         u8 opcode = 0;
 449         int found = 0;
 450
 451         spin_lock(&ide_lock);
 452         rq = NULL;
 453         if (HWGROUP(drive))
 454                 rq = HWGROUP(drive)->rq;
 455         spin_unlock(&ide_lock);
 456         if (!rq)
 457                 return;
 458         if (rq->cmd_type == REQ_TYPE_ATA_CMD ||
 459             rq->cmd_type == REQ_TYPE_ATA_TASK) {
 460                 char *args = rq->buffer;
 461                 if (args) {
 462                         opcode = args[0];
 463                         found = 1;
 464                 }
 465         } else if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
 466                 ide_task_t *args = rq->special;
 467                 if (args) {
 468                         task_struct_t *tf = (task_struct_t *) args->tfRegister;
 469                         opcode = tf->command;
 470                         found = 1;
 471                 }
 472         }
 473
 474         printk("ide: failed opcode was: ");
 475         if (!found)
 476                 printk("unknown\n");
 477         else
 478                 printk("0x%02x\n", opcode);
 479 }
 480
 481 static u8 ide_dump_ata_status(ide_drive_t *drive, const char *msg, u8 stat)
 482 {
 483         ide_hwif_t *hwif = HWIF(drive);
 484         unsigned long flags;
 485         u8 err = 0;
 486
 487         local_irq_save(flags);
 488         printk("%s: %s: status=0x%02x { ", drive->name, msg, stat);
 489         if (stat & BUSY_STAT)
 490                 printk("Busy ");
 491         else {
 492                 if (stat & READY_STAT)  printk("DriveReady ");
 493                 if (stat & WRERR_STAT)  printk("DeviceFault ");
 494                 if (stat & SEEK_STAT)   printk("SeekComplete ");
 495                 if (stat & DRQ_STAT)    printk("DataRequest ");
 496                 if (stat & ECC_STAT)    printk("CorrectedError ");
 497                 if (stat & INDEX_STAT)  printk("Index ");
 498                 if (stat & ERR_STAT)    printk("Error ");
 499         }
 500         printk("}\n");
 501         if ((stat & (BUSY_STAT|ERR_STAT)) == ERR_STAT) {
 502                 err = hwif->INB(IDE_ERROR_REG);
 503                 printk("%s: %s: error=0x%02x { ", drive->name, msg, err);
 504                 if (err & ABRT_ERR)     printk("DriveStatusError ");
 505                 if (err & ICRC_ERR)
 506                         printk((err & ABRT_ERR) ? "BadCRC " : "BadSector ");
 507                 if (err & ECC_ERR)      printk("UncorrectableError ");
 508                 if (err & ID_ERR)       printk("SectorIdNotFound ");
 509                 if (err & TRK0_ERR)     printk("TrackZeroNotFound ");
 510                 if (err & MARK_ERR)     printk("AddrMarkNotFound ");
 511                 printk("}");
 512                 if ((err & (BBD_ERR | ABRT_ERR)) == BBD_ERR ||
 513                     (err & (ECC_ERR|ID_ERR|MARK_ERR))) {
 514                         if (drive->addressing == 1) {
 515                                 __u64 sectors = 0;
 516                                 u32 low = 0, high = 0;
 517                                 low = ide_read_24(drive);
 518                                 hwif->OUTB(drive->ctl|0x80, IDE_CONTROL_REG);
 519                                 high = ide_read_24(drive);
 520                                 sectors = ((__u64)high << 24) | low;
 521                                 printk(", LBAsect=%llu, high=%d, low=%d",
 522                                        (unsigned long long) sectors,
 523                                        high, low);
 524                         } else {
 525                                 u8 cur = hwif->INB(IDE_SELECT_REG);
 526                                 if (cur & 0x40) {       /* using LBA? */
 527                                         printk(", LBAsect=%ld", (unsigned long)
 528                                          ((cur&0xf)<<24)
 529                                          |(hwif->INB(IDE_HCYL_REG)<<16)
 530                                          |(hwif->INB(IDE_LCYL_REG)<<8)
 531                                          | hwif->INB(IDE_SECTOR_REG));
 532                                 } else {
 533                                         printk(", CHS=%d/%d/%d",
 534                                          (hwif->INB(IDE_HCYL_REG)<<8) +
 535                                           hwif->INB(IDE_LCYL_REG),
 536                                           cur & 0xf,
 537                                           hwif->INB(IDE_SECTOR_REG));
 538                                 }
 539                         }
 540                         if (HWGROUP(drive) && HWGROUP(drive)->rq)
 541                                 printk(", sector=%llu",
 542                                         (unsigned long long)HWGROUP(drive)->rq->sector);
 543                 }
 544                 printk("\n");
 545         }
 546         ide_dump_opcode(drive);
 547         local_irq_restore(flags);
 548         return err;
 549 }
 550
 551 /**
 552  *      ide_dump_atapi_status       -       print human readable atapi status
 553  *      @drive: drive that status applies to
 554  *      @msg: text message to print
 555  *      @stat: status byte to decode
 556  *
 557  *      Error reporting, in human readable form (luxurious, but a memory hog).
 558  */
 559
 560 static u8 ide_dump_atapi_status(ide_drive_t *drive, const char *msg, u8 stat)
 561 {
 562         unsigned long flags;
 563
 564         atapi_status_t status;
 565         atapi_error_t error;
 566
 567         status.all = stat;
 568         error.all = 0;
 569         local_irq_save(flags);
 570         printk("%s: %s: status=0x%02x { ", drive->name, msg, stat);
 571         if (status.b.bsy)
 572                 printk("Busy ");
 573         else {
 574                 if (status.b.drdy)      printk("DriveReady ");
 575                 if (status.b.df)        printk("DeviceFault ");
 576                 if (status.b.dsc)       printk("SeekComplete ");
 577                 if (status.b.drq)       printk("DataRequest ");
 578                 if (status.b.corr)      printk("CorrectedError ");
 579                 if (status.b.idx)       printk("Index ");
 580                 if (status.b.check)     printk("Error ");
 581         }
 582         printk("}\n");
 583         if (status.b.check && !status.b.bsy) {
 584                 error.all = HWIF(drive)->INB(IDE_ERROR_REG);
 585                 printk("%s: %s: error=0x%02x { ", drive->name, msg, error.all);
 586                 if (error.b.ili)        printk("IllegalLengthIndication ");
 587                 if (error.b.eom)        printk("EndOfMedia ");
 588                 if (error.b.abrt)       printk("AbortedCommand ");
 589                 if (error.b.mcr)        printk("MediaChangeRequested ");
 590                 if (error.b.sense_key)  printk("LastFailedSense=0x%02x ",
 591                                                 error.b.sense_key);
 592                 printk("}\n");
 593         }
 594         ide_dump_opcode(drive);
 595         local_irq_restore(flags);
 596         return error.all;
 597 }
 598
 599 /**
 600  *      ide_dump_status         -       translate ATA/ATAPI error
 601  *      @drive: drive the error occured on
 602  *      @msg: information string
 603  *      @stat: status byte
 604  *
 605  *      Error reporting, in human readable form (luxurious, but a memory hog).
 606  *      Combines the drive name, message and status byte to provide a
 607  *      user understandable explanation of the device error.
 608  */
 609
 610 u8 ide_dump_status(ide_drive_t *drive, const char *msg, u8 stat)
 611 {
 612         if (drive->media == ide_disk)
 613                 return ide_dump_ata_status(drive, msg, stat);
 614         return ide_dump_atapi_status(drive, msg, stat);
 615 }
 616
 617 EXPORT_SYMBOL(ide_dump_status);