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 static const char *udma_str[] =
  25          { "UDMA/16", "UDMA/25",  "UDMA/33",  "UDMA/44",
  26            "UDMA/66", "UDMA/100", "UDMA/133", "UDMA7" };
  27 static const char *mwdma_str[] =
  28         { "MWDMA0", "MWDMA1", "MWDMA2" };
  29 static const char *swdma_str[] =
  30         { "SWDMA0", "SWDMA1", "SWDMA2" };
  31 static const char *pio_str[] =
  32         { "PIO0", "PIO1", "PIO2", "PIO3", "PIO4", "PIO5" };
  33
  34 /**
  35  *      ide_xfer_verbose        -       return IDE mode names
  36  *      @mode: transfer mode
  37  *
  38  *      Returns a constant string giving the name of the mode
  39  *      requested.
  40  */
  41
  42 const char *ide_xfer_verbose(u8 mode)
  43 {
  44         const char *s;
  45         u8 i = mode & 0xf;
  46
  47         if (mode >= XFER_UDMA_0 && mode <= XFER_UDMA_7)
  48                 s = udma_str[i];
  49         else if (mode >= XFER_MW_DMA_0 && mode <= XFER_MW_DMA_2)
  50                 s = mwdma_str[i];
  51         else if (mode >= XFER_SW_DMA_0 && mode <= XFER_SW_DMA_2)
  52                 s = swdma_str[i];
  53         else if (mode >= XFER_PIO_0 && mode <= XFER_PIO_5)
  54                 s = pio_str[i & 0x7];
  55         else if (mode == XFER_PIO_SLOW)
  56                 s = "PIO SLOW";
  57         else
  58                 s = "XFER ERROR";
  59
  60         return s;
  61 }
  62
  63 EXPORT_SYMBOL(ide_xfer_verbose);
  64
  65 /**
  66  *      ide_rate_filter         -       filter transfer mode
  67  *      @drive: IDE device
  68  *      @speed: desired speed
  69  *
  70  *      Given the available transfer modes this function returns
  71  *      the best available speed at or below the speed requested.
  72  *
  73  *      TODO: check device PIO capabilities
  74  */
  75
  76 static u8 ide_rate_filter(ide_drive_t *drive, u8 speed)
  77 {
  78         ide_hwif_t *hwif = drive->hwif;
  79         u8 mode = ide_find_dma_mode(drive, speed);
  80
  81         if (mode == 0) {
  82                 if (hwif->pio_mask)
  83                         mode = fls(hwif->pio_mask) - 1 + XFER_PIO_0;
  84                 else
  85                         mode = XFER_PIO_4;
  86         }
  87
  88 //      printk("%s: mode 0x%02x, speed 0x%02x\n", __FUNCTION__, mode, speed);
  89
  90         return min(speed, mode);
  91 }
  92
  93 /*
  94  * Standard (generic) timings for PIO modes, from ATA2 specification.
  95  * These timings are for access to the IDE data port register *only*.
  96  * Some drives may specify a mode, while also specifying a different
  97  * value for cycle_time (from drive identification data).
  98  */
  99 const ide_pio_timings_t ide_pio_timings[6] = {
 100         { 70,   165,    600 },  /* PIO Mode 0 */
 101         { 50,   125,    383 },  /* PIO Mode 1 */
 102         { 30,   100,    240 },  /* PIO Mode 2 */
 103         { 30,   80,     180 },  /* PIO Mode 3 with IORDY */
 104         { 25,   70,     120 },  /* PIO Mode 4 with IORDY */
 105         { 20,   50,     100 }   /* PIO Mode 5 with IORDY (nonstandard) */
 106 };
 107
 108 EXPORT_SYMBOL_GPL(ide_pio_timings);
 109
 110 /*
 111  * Shared data/functions for determining best PIO mode for an IDE drive.
 112  * Most of this stuff originally lived in cmd640.c, and changes to the
 113  * ide_pio_blacklist[] table should be made with EXTREME CAUTION to avoid
 114  * breaking the fragile cmd640.c support.
 115  */
 116
 117 /*
 118  * Black list. Some drives incorrectly report their maximal PIO mode,
 119  * at least in respect to CMD640. Here we keep info on some known drives.
 120  */
 121 static struct ide_pio_info {
 122         const char      *name;
 123         int             pio;
 124 } ide_pio_blacklist [] = {
 125         { "Conner Peripherals 540MB - CFS540A", 3 },
 126
 127         { "WDC AC2700",  3 },
 128         { "WDC AC2540",  3 },
 129         { "WDC AC2420",  3 },
 130         { "WDC AC2340",  3 },
 131         { "WDC AC2250",  0 },
 132         { "WDC AC2200",  0 },
 133         { "WDC AC21200", 4 },
 134         { "WDC AC2120",  0 },
 135         { "WDC AC2850",  3 },
 136         { "WDC AC1270",  3 },
 137         { "WDC AC1170",  1 },
 138         { "WDC AC1210",  1 },
 139         { "WDC AC280",   0 },
 140         { "WDC AC31000", 3 },
 141         { "WDC AC31200", 3 },
 142
 143         { "Maxtor 7131 AT", 1 },
 144         { "Maxtor 7171 AT", 1 },
 145         { "Maxtor 7213 AT", 1 },
 146         { "Maxtor 7245 AT", 1 },
 147         { "Maxtor 7345 AT", 1 },
 148         { "Maxtor 7546 AT", 3 },
 149         { "Maxtor 7540 AV", 3 },
 150
 151         { "SAMSUNG SHD-3121A", 1 },
 152         { "SAMSUNG SHD-3122A", 1 },
 153         { "SAMSUNG SHD-3172A", 1 },
 154
 155         { "ST5660A",  3 },
 156         { "ST3660A",  3 },
 157         { "ST3630A",  3 },
 158         { "ST3655A",  3 },
 159         { "ST3391A",  3 },
 160         { "ST3390A",  1 },
 161         { "ST3600A",  1 },
 162         { "ST3290A",  0 },
 163         { "ST3144A",  0 },
 164         { "ST3491A",  1 },      /* reports 3, should be 1 or 2 (depending on */
 165                                 /* drive) according to Seagates FIND-ATA program */
 166
 167         { "QUANTUM ELS127A", 0 },
 168         { "QUANTUM ELS170A", 0 },
 169         { "QUANTUM LPS240A", 0 },
 170         { "QUANTUM LPS210A", 3 },
 171         { "QUANTUM LPS270A", 3 },
 172         { "QUANTUM LPS365A", 3 },
 173         { "QUANTUM LPS540A", 3 },
 174         { "QUANTUM LIGHTNING 540A", 3 },
 175         { "QUANTUM LIGHTNING 730A", 3 },
 176
 177         { "QUANTUM FIREBALL_540", 3 }, /* Older Quantum Fireballs don't work */
 178         { "QUANTUM FIREBALL_640", 3 },
 179         { "QUANTUM FIREBALL_1080", 3 },
 180         { "QUANTUM FIREBALL_1280", 3 },
 181         { NULL, 0 }
 182 };
 183
 184 /**
 185  *      ide_scan_pio_blacklist  -       check for a blacklisted drive
 186  *      @model: Drive model string
 187  *
 188  *      This routine searches the ide_pio_blacklist for an entry
 189  *      matching the start/whole of the supplied model name.
 190  *
 191  *      Returns -1 if no match found.
 192  *      Otherwise returns the recommended PIO mode from ide_pio_blacklist[].
 193  */
 194
 195 static int ide_scan_pio_blacklist (char *model)
 196 {
 197         struct ide_pio_info *p;
 198
 199         for (p = ide_pio_blacklist; p->name != NULL; p++) {
 200                 if (strncmp(p->name, model, strlen(p->name)) == 0)
 201                         return p->pio;
 202         }
 203         return -1;
 204 }
 205
 206 unsigned int ide_pio_cycle_time(ide_drive_t *drive, u8 pio)
 207 {
 208         struct hd_driveid *id = drive->id;
 209         int cycle_time = 0;
 210
 211         if (id->field_valid & 2) {
 212                 if (id->capability & 8)
 213                         cycle_time = id->eide_pio_iordy;
 214                 else
 215                         cycle_time = id->eide_pio;
 216         }
 217
 218         /* conservative "downgrade" for all pre-ATA2 drives */
 219         if (pio < 3) {
 220                 if (cycle_time && cycle_time < ide_pio_timings[pio].cycle_time)
 221                         cycle_time = 0; /* use standard timing */
 222         }
 223
 224         return cycle_time ? cycle_time : ide_pio_timings[pio].cycle_time;
 225 }
 226
 227 EXPORT_SYMBOL_GPL(ide_pio_cycle_time);
 228
 229 /**
 230  *      ide_get_best_pio_mode   -       get PIO mode from drive
 231  *      @drive: drive to consider
 232  *      @mode_wanted: preferred mode
 233  *      @max_mode: highest allowed mode
 234  *
 235  *      This routine returns the recommended PIO settings for a given drive,
 236  *      based on the drive->id information and the ide_pio_blacklist[].
 237  *
 238  *      Drive PIO mode is auto-selected if 255 is passed as mode_wanted.
 239  *      This is used by most chipset support modules when "auto-tuning".
 240  */
 241
 242 u8 ide_get_best_pio_mode (ide_drive_t *drive, u8 mode_wanted, u8 max_mode)
 243 {
 244         int pio_mode;
 245         struct hd_driveid* id = drive->id;
 246         int overridden  = 0;
 247
 248         if (mode_wanted != 255)
 249                 return min_t(u8, mode_wanted, max_mode);
 250
 251         if ((drive->hwif->host_flags & IDE_HFLAG_PIO_NO_BLACKLIST) == 0 &&
 252             (pio_mode = ide_scan_pio_blacklist(id->model)) != -1) {
 253                 printk(KERN_INFO "%s: is on PIO blacklist\n", drive->name);
 254         } else {
 255                 pio_mode = id->tPIO;
 256                 if (pio_mode > 2) {     /* 2 is maximum allowed tPIO value */
 257                         pio_mode = 2;
 258                         overridden = 1;
 259                 }
 260                 if (id->field_valid & 2) {        /* drive implements ATA2? */
 261                         if (id->capability & 8) { /* IORDY supported? */
 262                                 if (id->eide_pio_modes & 7) {
 263                                         overridden = 0;
 264                                         if (id->eide_pio_modes & 4)
 265                                                 pio_mode = 5;
 266                                         else if (id->eide_pio_modes & 2)
 267                                                 pio_mode = 4;
 268                                         else
 269                                                 pio_mode = 3;
 270                                 }
 271                         }
 272                 }
 273
 274                 if (overridden)
 275                         printk(KERN_INFO "%s: tPIO > 2, assuming tPIO = 2\n",
 276                                          drive->name);
 277         }
 278
 279         if (pio_mode > max_mode)
 280                 pio_mode = max_mode;
 281
 282         return pio_mode;
 283 }
 284
 285 EXPORT_SYMBOL_GPL(ide_get_best_pio_mode);
 286
 287 /* req_pio == "255" for auto-tune */
 288 void ide_set_pio(ide_drive_t *drive, u8 req_pio)
 289 {
 290         ide_hwif_t *hwif = drive->hwif;
 291         u8 host_pio, pio;
 292
 293         if (hwif->set_pio_mode == NULL ||
 294             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
 295                 return;
 296
 297         BUG_ON(hwif->pio_mask == 0x00);
 298
 299         host_pio = fls(hwif->pio_mask) - 1;
 300
 301         pio = ide_get_best_pio_mode(drive, req_pio, host_pio);
 302
 303         /*
 304          * TODO:
 305          * - report device max PIO mode
 306          * - check req_pio != 255 against device max PIO mode
 307          */
 308         printk(KERN_DEBUG "%s: host max PIO%d wanted PIO%d%s selected PIO%d\n",
 309                           drive->name, host_pio, req_pio,
 310                           req_pio == 255 ? "(auto-tune)" : "", pio);
 311
 312         (void)ide_set_pio_mode(drive, XFER_PIO_0 + pio);
 313 }
 314
 315 EXPORT_SYMBOL_GPL(ide_set_pio);
 316
 317 /**
 318  *      ide_toggle_bounce       -       handle bounce buffering
 319  *      @drive: drive to update
 320  *      @on: on/off boolean
 321  *
 322  *      Enable or disable bounce buffering for the device. Drives move
 323  *      between PIO and DMA and that changes the rules we need.
 324  */
 325
 326 void ide_toggle_bounce(ide_drive_t *drive, int on)
 327 {
 328         u64 addr = BLK_BOUNCE_HIGH;     /* dma64_addr_t */
 329
 330         if (!PCI_DMA_BUS_IS_PHYS) {
 331                 addr = BLK_BOUNCE_ANY;
 332         } else if (on && drive->media == ide_disk) {
 333                 struct device *dev = drive->hwif->dev;
 334
 335                 if (dev && dev->dma_mask)
 336                         addr = *dev->dma_mask;
 337         }
 338
 339         if (drive->queue)
 340                 blk_queue_bounce_limit(drive->queue, addr);
 341 }
 342
 343 int ide_set_pio_mode(ide_drive_t *drive, const u8 mode)
 344 {
 345         ide_hwif_t *hwif = drive->hwif;
 346
 347         if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)
 348                 return 0;
 349
 350         if (hwif->set_pio_mode == NULL)
 351                 return -1;
 352
 353         /*
 354          * TODO: temporary hack for some legacy host drivers that didn't
 355          * set transfer mode on the device in ->set_pio_mode method...
 356          */
 357         if (hwif->set_dma_mode == NULL) {
 358                 hwif->set_pio_mode(drive, mode - XFER_PIO_0);
 359                 return 0;
 360         }
 361
 362         if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
 363                 if (ide_config_drive_speed(drive, mode))
 364                         return -1;
 365                 hwif->set_pio_mode(drive, mode - XFER_PIO_0);
 366                 return 0;
 367         } else {
 368                 hwif->set_pio_mode(drive, mode - XFER_PIO_0);
 369                 return ide_config_drive_speed(drive, mode);
 370         }
 371 }
 372
 373 int ide_set_dma_mode(ide_drive_t *drive, const u8 mode)
 374 {
 375         ide_hwif_t *hwif = drive->hwif;
 376
 377         if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)
 378                 return 0;
 379
 380         if (hwif->set_dma_mode == NULL)
 381                 return -1;
 382
 383         if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
 384                 if (ide_config_drive_speed(drive, mode))
 385                         return -1;
 386                 hwif->set_dma_mode(drive, mode);
 387                 return 0;
 388         } else {
 389                 hwif->set_dma_mode(drive, mode);
 390                 return ide_config_drive_speed(drive, mode);
 391         }
 392 }
 393
 394 EXPORT_SYMBOL_GPL(ide_set_dma_mode);
 395
 396 /**
 397  *      ide_set_xfer_rate       -       set transfer rate
 398  *      @drive: drive to set
 399  *      @rate: speed to attempt to set
 400  *
 401  *      General helper for setting the speed of an IDE device. This
 402  *      function knows about user enforced limits from the configuration
 403  *      which ->set_pio_mode/->set_dma_mode does not.
 404  */
 405
 406 int ide_set_xfer_rate(ide_drive_t *drive, u8 rate)
 407 {
 408         ide_hwif_t *hwif = drive->hwif;
 409
 410         if (hwif->set_dma_mode == NULL ||
 411             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
 412                 return -1;
 413
 414         rate = ide_rate_filter(drive, rate);
 415
 416         if (rate >= XFER_PIO_0 && rate <= XFER_PIO_5)
 417                 return ide_set_pio_mode(drive, rate);
 418
 419         /*
 420          * TODO: transfer modes 0x00-0x07 passed from the user-space are
 421          * currently handled here which needs fixing (please note that such
 422          * case could happen iff the transfer mode has already been set on
 423          * the device by ide-proc.c::set_xfer_rate()).
 424          */
 425         if (rate < XFER_PIO_0) {
 426                 if (hwif->host_flags & IDE_HFLAG_ABUSE_SET_DMA_MODE)
 427                         return ide_set_dma_mode(drive, rate);
 428                 else
 429                         return ide_config_drive_speed(drive, rate);
 430         }
 431
 432         return ide_set_dma_mode(drive, rate);
 433 }
 434
 435 static void ide_dump_opcode(ide_drive_t *drive)
 436 {
 437         struct request *rq;
 438         ide_task_t *task = NULL;
 439
 440         spin_lock(&ide_lock);
 441         rq = NULL;
 442         if (HWGROUP(drive))
 443                 rq = HWGROUP(drive)->rq;
 444         spin_unlock(&ide_lock);
 445         if (!rq)
 446                 return;
 447
 448         if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE)
 449                 task = rq->special;
 450
 451         printk("ide: failed opcode was: ");
 452         if (task == NULL)
 453                 printk(KERN_CONT "unknown\n");
 454         else
 455                 printk(KERN_CONT "0x%02x\n", task->tf.command);
 456 }
 457
 458 u64 ide_get_lba_addr(struct ide_taskfile *tf, int lba48)
 459 {
 460         u32 high, low;
 461
 462         if (lba48)
 463                 high = (tf->hob_lbah << 16) | (tf->hob_lbam << 8) |
 464                         tf->hob_lbal;
 465         else
 466                 high = tf->device & 0xf;
 467         low  = (tf->lbah << 16) | (tf->lbam << 8) | tf->lbal;
 468
 469         return ((u64)high << 24) | low;
 470 }
 471 EXPORT_SYMBOL_GPL(ide_get_lba_addr);
 472
 473 static void ide_dump_sector(ide_drive_t *drive)
 474 {
 475         ide_task_t task;
 476         struct ide_taskfile *tf = &task.tf;
 477         int lba48 = (drive->addressing == 1) ? 1 : 0;
 478
 479         memset(&task, 0, sizeof(task));
 480         if (lba48)
 481                 task.tf_flags = IDE_TFLAG_IN_LBA | IDE_TFLAG_IN_HOB_LBA |
 482                                 IDE_TFLAG_LBA48;
 483         else
 484                 task.tf_flags = IDE_TFLAG_IN_LBA | IDE_TFLAG_IN_DEVICE;
 485
 486         ide_tf_read(drive, &task);
 487
 488         if (lba48 || (tf->device & ATA_LBA))
 489                 printk(", LBAsect=%llu",
 490                         (unsigned long long)ide_get_lba_addr(tf, lba48));
 491         else
 492                 printk(", CHS=%d/%d/%d", (tf->lbah << 8) + tf->lbam,
 493                                          tf->device & 0xf, tf->lbal);
 494 }
 495
 496 static void ide_dump_ata_error(ide_drive_t *drive, u8 err)
 497 {
 498         printk("{ ");
 499         if (err & ABRT_ERR)     printk("DriveStatusError ");
 500         if (err & ICRC_ERR)
 501                 printk((err & ABRT_ERR) ? "BadCRC " : "BadSector ");
 502         if (err & ECC_ERR)      printk("UncorrectableError ");
 503         if (err & ID_ERR)       printk("SectorIdNotFound ");
 504         if (err & TRK0_ERR)     printk("TrackZeroNotFound ");
 505         if (err & MARK_ERR)     printk("AddrMarkNotFound ");
 506         printk("}");
 507         if ((err & (BBD_ERR | ABRT_ERR)) == BBD_ERR ||
 508             (err & (ECC_ERR|ID_ERR|MARK_ERR))) {
 509                 ide_dump_sector(drive);
 510                 if (HWGROUP(drive) && HWGROUP(drive)->rq)
 511                         printk(", sector=%llu",
 512                                (unsigned long long)HWGROUP(drive)->rq->sector);
 513         }
 514         printk("\n");
 515 }
 516
 517 static void ide_dump_atapi_error(ide_drive_t *drive, u8 err)
 518 {
 519         printk("{ ");
 520         if (err & ILI_ERR)      printk("IllegalLengthIndication ");
 521         if (err & EOM_ERR)      printk("EndOfMedia ");
 522         if (err & ABRT_ERR)     printk("AbortedCommand ");
 523         if (err & MCR_ERR)      printk("MediaChangeRequested ");
 524         if (err & LFS_ERR)      printk("LastFailedSense=0x%02x ",
 525                                        (err & LFS_ERR) >> 4);
 526         printk("}\n");
 527 }
 528
 529 /**
 530  *      ide_dump_status         -       translate ATA/ATAPI error
 531  *      @drive: drive that status applies to
 532  *      @msg: text message to print
 533  *      @stat: status byte to decode
 534  *
 535  *      Error reporting, in human readable form (luxurious, but a memory hog).
 536  *      Combines the drive name, message and status byte to provide a
 537  *      user understandable explanation of the device error.
 538  */
 539
 540 u8 ide_dump_status(ide_drive_t *drive, const char *msg, u8 stat)
 541 {
 542         unsigned long flags;
 543         u8 err = 0;
 544
 545         local_irq_save(flags);
 546         printk("%s: %s: status=0x%02x { ", drive->name, msg, stat);
 547         if (stat & BUSY_STAT)
 548                 printk("Busy ");
 549         else {
 550                 if (stat & READY_STAT)  printk("DriveReady ");
 551                 if (stat & WRERR_STAT)  printk("DeviceFault ");
 552                 if (stat & SEEK_STAT)   printk("SeekComplete ");
 553                 if (stat & DRQ_STAT)    printk("DataRequest ");
 554                 if (stat & ECC_STAT)    printk("CorrectedError ");
 555                 if (stat & INDEX_STAT)  printk("Index ");
 556                 if (stat & ERR_STAT)    printk("Error ");
 557         }
 558         printk("}\n");
 559         if ((stat & (BUSY_STAT|ERR_STAT)) == ERR_STAT) {
 560                 err = ide_read_error(drive);
 561                 printk("%s: %s: error=0x%02x ", drive->name, msg, err);
 562                 if (drive->media == ide_disk)
 563                         ide_dump_ata_error(drive, err);
 564                 else
 565                         ide_dump_atapi_error(drive, err);
 566         }
 567         ide_dump_opcode(drive);
 568         local_irq_restore(flags);
 569         return err;
 570 }
 571
 572 EXPORT_SYMBOL(ide_dump_status);