drivers/ide/ide-lib.c

   1 #include <linux/types.h>
   2 #include <linux/string.h>
   3 #include <linux/kernel.h>
   4 #include <linux/interrupt.h>
   5 #include <linux/hdreg.h>
   6 #include <linux/ide.h>
   7 #include <linux/bitops.h>
   8
   9 static const char *udma_str[] =
  10          { "UDMA/16", "UDMA/25",  "UDMA/33",  "UDMA/44",
  11            "UDMA/66", "UDMA/100", "UDMA/133", "UDMA7" };
  12 static const char *mwdma_str[] =
  13         { "MWDMA0", "MWDMA1", "MWDMA2" };
  14 static const char *swdma_str[] =
  15         { "SWDMA0", "SWDMA1", "SWDMA2" };
  16 static const char *pio_str[] =
  17         { "PIO0", "PIO1", "PIO2", "PIO3", "PIO4", "PIO5" };
  18
  19 /**
  20  *      ide_xfer_verbose        -       return IDE mode names
  21  *      @mode: transfer mode
  22  *
  23  *      Returns a constant string giving the name of the mode
  24  *      requested.
  25  */
  26
  27 const char *ide_xfer_verbose(u8 mode)
  28 {
  29         const char *s;
  30         u8 i = mode & 0xf;
  31
  32         if (mode >= XFER_UDMA_0 && mode <= XFER_UDMA_7)
  33                 s = udma_str[i];
  34         else if (mode >= XFER_MW_DMA_0 && mode <= XFER_MW_DMA_2)
  35                 s = mwdma_str[i];
  36         else if (mode >= XFER_SW_DMA_0 && mode <= XFER_SW_DMA_2)
  37                 s = swdma_str[i];
  38         else if (mode >= XFER_PIO_0 && mode <= XFER_PIO_5)
  39                 s = pio_str[i & 0x7];
  40         else if (mode == XFER_PIO_SLOW)
  41                 s = "PIO SLOW";
  42         else
  43                 s = "XFER ERROR";
  44
  45         return s;
  46 }
  47
  48 EXPORT_SYMBOL(ide_xfer_verbose);
  49
  50 /**
  51  *      ide_rate_filter         -       filter transfer mode
  52  *      @drive: IDE device
  53  *      @speed: desired speed
  54  *
  55  *      Given the available transfer modes this function returns
  56  *      the best available speed at or below the speed requested.
  57  *
  58  *      TODO: check device PIO capabilities
  59  */
  60
  61 static u8 ide_rate_filter(ide_drive_t *drive, u8 speed)
  62 {
  63         ide_hwif_t *hwif = drive->hwif;
  64         u8 mode = ide_find_dma_mode(drive, speed);
  65
  66         if (mode == 0) {
  67                 if (hwif->pio_mask)
  68                         mode = fls(hwif->pio_mask) - 1 + XFER_PIO_0;
  69                 else
  70                         mode = XFER_PIO_4;
  71         }
  72
  73 /*      printk("%s: mode 0x%02x, speed 0x%02x\n", __func__, mode, speed); */
  74
  75         return min(speed, mode);
  76 }
  77
  78 /**
  79  *      ide_get_best_pio_mode   -       get PIO mode from drive
  80  *      @drive: drive to consider
  81  *      @mode_wanted: preferred mode
  82  *      @max_mode: highest allowed mode
  83  *
  84  *      This routine returns the recommended PIO settings for a given drive,
  85  *      based on the drive->id information and the ide_pio_blacklist[].
  86  *
  87  *      Drive PIO mode is auto-selected if 255 is passed as mode_wanted.
  88  *      This is used by most chipset support modules when "auto-tuning".
  89  */
  90
  91 u8 ide_get_best_pio_mode (ide_drive_t *drive, u8 mode_wanted, u8 max_mode)
  92 {
  93         int pio_mode;
  94         struct hd_driveid* id = drive->id;
  95         int overridden  = 0;
  96
  97         if (mode_wanted != 255)
  98                 return min_t(u8, mode_wanted, max_mode);
  99
 100         if ((drive->hwif->host_flags & IDE_HFLAG_PIO_NO_BLACKLIST) == 0 &&
 101             (pio_mode = ide_scan_pio_blacklist(id->model)) != -1) {
 102                 printk(KERN_INFO "%s: is on PIO blacklist\n", drive->name);
 103         } else {
 104                 pio_mode = id->tPIO;
 105                 if (pio_mode > 2) {     /* 2 is maximum allowed tPIO value */
 106                         pio_mode = 2;
 107                         overridden = 1;
 108                 }
 109                 if (id->field_valid & 2) {        /* drive implements ATA2? */
 110                         if (id->capability & 8) { /* IORDY supported? */
 111                                 if (id->eide_pio_modes & 7) {
 112                                         overridden = 0;
 113                                         if (id->eide_pio_modes & 4)
 114                                                 pio_mode = 5;
 115                                         else if (id->eide_pio_modes & 2)
 116                                                 pio_mode = 4;
 117                                         else
 118                                                 pio_mode = 3;
 119                                 }
 120                         }
 121                 }
 122
 123                 if (overridden)
 124                         printk(KERN_INFO "%s: tPIO > 2, assuming tPIO = 2\n",
 125                                          drive->name);
 126         }
 127
 128         if (pio_mode > max_mode)
 129                 pio_mode = max_mode;
 130
 131         return pio_mode;
 132 }
 133
 134 EXPORT_SYMBOL_GPL(ide_get_best_pio_mode);
 135
 136 /* req_pio == "255" for auto-tune */
 137 void ide_set_pio(ide_drive_t *drive, u8 req_pio)
 138 {
 139         ide_hwif_t *hwif = drive->hwif;
 140         const struct ide_port_ops *port_ops = hwif->port_ops;
 141         u8 host_pio, pio;
 142
 143         if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
 144             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
 145                 return;
 146
 147         BUG_ON(hwif->pio_mask == 0x00);
 148
 149         host_pio = fls(hwif->pio_mask) - 1;
 150
 151         pio = ide_get_best_pio_mode(drive, req_pio, host_pio);
 152
 153         /*
 154          * TODO:
 155          * - report device max PIO mode
 156          * - check req_pio != 255 against device max PIO mode
 157          */
 158         printk(KERN_DEBUG "%s: host max PIO%d wanted PIO%d%s selected PIO%d\n",
 159                           drive->name, host_pio, req_pio,
 160                           req_pio == 255 ? "(auto-tune)" : "", pio);
 161
 162         (void)ide_set_pio_mode(drive, XFER_PIO_0 + pio);
 163 }
 164
 165 EXPORT_SYMBOL_GPL(ide_set_pio);
 166
 167 /**
 168  *      ide_toggle_bounce       -       handle bounce buffering
 169  *      @drive: drive to update
 170  *      @on: on/off boolean
 171  *
 172  *      Enable or disable bounce buffering for the device. Drives move
 173  *      between PIO and DMA and that changes the rules we need.
 174  */
 175
 176 void ide_toggle_bounce(ide_drive_t *drive, int on)
 177 {
 178         u64 addr = BLK_BOUNCE_HIGH;     /* dma64_addr_t */
 179
 180         if (!PCI_DMA_BUS_IS_PHYS) {
 181                 addr = BLK_BOUNCE_ANY;
 182         } else if (on && drive->media == ide_disk) {
 183                 struct device *dev = drive->hwif->dev;
 184
 185                 if (dev && dev->dma_mask)
 186                         addr = *dev->dma_mask;
 187         }
 188
 189         if (drive->queue)
 190                 blk_queue_bounce_limit(drive->queue, addr);
 191 }
 192
 193 int ide_set_pio_mode(ide_drive_t *drive, const u8 mode)
 194 {
 195         ide_hwif_t *hwif = drive->hwif;
 196         const struct ide_port_ops *port_ops = hwif->port_ops;
 197
 198         if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)
 199                 return 0;
 200
 201         if (port_ops == NULL || port_ops->set_pio_mode == NULL)
 202                 return -1;
 203
 204         /*
 205          * TODO: temporary hack for some legacy host drivers that didn't
 206          * set transfer mode on the device in ->set_pio_mode method...
 207          */
 208         if (port_ops->set_dma_mode == NULL) {
 209                 port_ops->set_pio_mode(drive, mode - XFER_PIO_0);
 210                 return 0;
 211         }
 212
 213         if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
 214                 if (ide_config_drive_speed(drive, mode))
 215                         return -1;
 216                 port_ops->set_pio_mode(drive, mode - XFER_PIO_0);
 217                 return 0;
 218         } else {
 219                 port_ops->set_pio_mode(drive, mode - XFER_PIO_0);
 220                 return ide_config_drive_speed(drive, mode);
 221         }
 222 }
 223
 224 int ide_set_dma_mode(ide_drive_t *drive, const u8 mode)
 225 {
 226         ide_hwif_t *hwif = drive->hwif;
 227         const struct ide_port_ops *port_ops = hwif->port_ops;
 228
 229         if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)
 230                 return 0;
 231
 232         if (port_ops == NULL || port_ops->set_dma_mode == NULL)
 233                 return -1;
 234
 235         if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
 236                 if (ide_config_drive_speed(drive, mode))
 237                         return -1;
 238                 port_ops->set_dma_mode(drive, mode);
 239                 return 0;
 240         } else {
 241                 port_ops->set_dma_mode(drive, mode);
 242                 return ide_config_drive_speed(drive, mode);
 243         }
 244 }
 245
 246 EXPORT_SYMBOL_GPL(ide_set_dma_mode);
 247
 248 /**
 249  *      ide_set_xfer_rate       -       set transfer rate
 250  *      @drive: drive to set
 251  *      @rate: speed to attempt to set
 252  *
 253  *      General helper for setting the speed of an IDE device. This
 254  *      function knows about user enforced limits from the configuration
 255  *      which ->set_pio_mode/->set_dma_mode does not.
 256  */
 257
 258 int ide_set_xfer_rate(ide_drive_t *drive, u8 rate)
 259 {
 260         ide_hwif_t *hwif = drive->hwif;
 261         const struct ide_port_ops *port_ops = hwif->port_ops;
 262
 263         if (port_ops == NULL || port_ops->set_dma_mode == NULL ||
 264             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
 265                 return -1;
 266
 267         rate = ide_rate_filter(drive, rate);
 268
 269         BUG_ON(rate < XFER_PIO_0);
 270
 271         if (rate >= XFER_PIO_0 && rate <= XFER_PIO_5)
 272                 return ide_set_pio_mode(drive, rate);
 273
 274         return ide_set_dma_mode(drive, rate);
 275 }
 276
 277 static void ide_dump_opcode(ide_drive_t *drive)
 278 {
 279         struct request *rq;
 280         ide_task_t *task = NULL;
 281
 282         spin_lock(&ide_lock);
 283         rq = NULL;
 284         if (HWGROUP(drive))
 285                 rq = HWGROUP(drive)->rq;
 286         spin_unlock(&ide_lock);
 287         if (!rq)
 288                 return;
 289
 290         if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE)
 291                 task = rq->special;
 292
 293         printk("ide: failed opcode was: ");
 294         if (task == NULL)
 295                 printk(KERN_CONT "unknown\n");
 296         else
 297                 printk(KERN_CONT "0x%02x\n", task->tf.command);
 298 }
 299
 300 u64 ide_get_lba_addr(struct ide_taskfile *tf, int lba48)
 301 {
 302         u32 high, low;
 303
 304         if (lba48)
 305                 high = (tf->hob_lbah << 16) | (tf->hob_lbam << 8) |
 306                         tf->hob_lbal;
 307         else
 308                 high = tf->device & 0xf;
 309         low  = (tf->lbah << 16) | (tf->lbam << 8) | tf->lbal;
 310
 311         return ((u64)high << 24) | low;
 312 }
 313 EXPORT_SYMBOL_GPL(ide_get_lba_addr);
 314
 315 static void ide_dump_sector(ide_drive_t *drive)
 316 {
 317         ide_task_t task;
 318         struct ide_taskfile *tf = &task.tf;
 319         int lba48 = (drive->addressing == 1) ? 1 : 0;
 320
 321         memset(&task, 0, sizeof(task));
 322         if (lba48)
 323                 task.tf_flags = IDE_TFLAG_IN_LBA | IDE_TFLAG_IN_HOB_LBA |
 324                                 IDE_TFLAG_LBA48;
 325         else
 326                 task.tf_flags = IDE_TFLAG_IN_LBA | IDE_TFLAG_IN_DEVICE;
 327
 328         drive->hwif->tp_ops->tf_read(drive, &task);
 329
 330         if (lba48 || (tf->device & ATA_LBA))
 331                 printk(", LBAsect=%llu",
 332                         (unsigned long long)ide_get_lba_addr(tf, lba48));
 333         else
 334                 printk(", CHS=%d/%d/%d", (tf->lbah << 8) + tf->lbam,
 335                                          tf->device & 0xf, tf->lbal);
 336 }
 337
 338 static void ide_dump_ata_error(ide_drive_t *drive, u8 err)
 339 {
 340         printk("{ ");
 341         if (err & ABRT_ERR)     printk("DriveStatusError ");
 342         if (err & ICRC_ERR)
 343                 printk((err & ABRT_ERR) ? "BadCRC " : "BadSector ");
 344         if (err & ECC_ERR)      printk("UncorrectableError ");
 345         if (err & ID_ERR)       printk("SectorIdNotFound ");
 346         if (err & TRK0_ERR)     printk("TrackZeroNotFound ");
 347         if (err & MARK_ERR)     printk("AddrMarkNotFound ");
 348         printk("}");
 349         if ((err & (BBD_ERR | ABRT_ERR)) == BBD_ERR ||
 350             (err & (ECC_ERR|ID_ERR|MARK_ERR))) {
 351                 ide_dump_sector(drive);
 352                 if (HWGROUP(drive) && HWGROUP(drive)->rq)
 353                         printk(", sector=%llu",
 354                                (unsigned long long)HWGROUP(drive)->rq->sector);
 355         }
 356         printk("\n");
 357 }
 358
 359 static void ide_dump_atapi_error(ide_drive_t *drive, u8 err)
 360 {
 361         printk("{ ");
 362         if (err & ILI_ERR)      printk("IllegalLengthIndication ");
 363         if (err & EOM_ERR)      printk("EndOfMedia ");
 364         if (err & ABRT_ERR)     printk("AbortedCommand ");
 365         if (err & MCR_ERR)      printk("MediaChangeRequested ");
 366         if (err & LFS_ERR)      printk("LastFailedSense=0x%02x ",
 367                                        (err & LFS_ERR) >> 4);
 368         printk("}\n");
 369 }
 370
 371 /**
 372  *      ide_dump_status         -       translate ATA/ATAPI error
 373  *      @drive: drive that status applies to
 374  *      @msg: text message to print
 375  *      @stat: status byte to decode
 376  *
 377  *      Error reporting, in human readable form (luxurious, but a memory hog).
 378  *      Combines the drive name, message and status byte to provide a
 379  *      user understandable explanation of the device error.
 380  */
 381
 382 u8 ide_dump_status(ide_drive_t *drive, const char *msg, u8 stat)
 383 {
 384         unsigned long flags;
 385         u8 err = 0;
 386
 387         local_irq_save(flags);
 388         printk("%s: %s: status=0x%02x { ", drive->name, msg, stat);
 389         if (stat & BUSY_STAT)
 390                 printk("Busy ");
 391         else {
 392                 if (stat & READY_STAT)  printk("DriveReady ");
 393                 if (stat & WRERR_STAT)  printk("DeviceFault ");
 394                 if (stat & SEEK_STAT)   printk("SeekComplete ");
 395                 if (stat & DRQ_STAT)    printk("DataRequest ");
 396                 if (stat & ECC_STAT)    printk("CorrectedError ");
 397                 if (stat & INDEX_STAT)  printk("Index ");
 398                 if (stat & ERR_STAT)    printk("Error ");
 399         }
 400         printk("}\n");
 401         if ((stat & (BUSY_STAT|ERR_STAT)) == ERR_STAT) {
 402                 err = ide_read_error(drive);
 403                 printk("%s: %s: error=0x%02x ", drive->name, msg, err);
 404                 if (drive->media == ide_disk)
 405                         ide_dump_ata_error(drive, err);
 406                 else
 407                         ide_dump_atapi_error(drive, err);
 408         }
 409         ide_dump_opcode(drive);
 410         local_irq_restore(flags);
 411         return err;
 412 }
 413
 414 EXPORT_SYMBOL(ide_dump_status);