drivers/ide/ide-iops.c

   1 /*
   2  *  Copyright (C) 2000-2002     Andre Hedrick <andre@linux-ide.org>
   3  *  Copyright (C) 2003          Red Hat
   4  *
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/types.h>
   9 #include <linux/string.h>
  10 #include <linux/kernel.h>
  11 #include <linux/timer.h>
  12 #include <linux/mm.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/major.h>
  15 #include <linux/errno.h>
  16 #include <linux/genhd.h>
  17 #include <linux/blkpg.h>
  18 #include <linux/slab.h>
  19 #include <linux/pci.h>
  20 #include <linux/delay.h>
  21 #include <linux/ide.h>
  22 #include <linux/bitops.h>
  23 #include <linux/nmi.h>
  24
  25 #include <asm/byteorder.h>
  26 #include <asm/irq.h>
  27 #include <asm/uaccess.h>
  28 #include <asm/io.h>
  29
  30 void SELECT_MASK(ide_drive_t *drive, int mask)
  31 {
  32         const struct ide_port_ops *port_ops = drive->hwif->port_ops;
  33
  34         if (port_ops && port_ops->maskproc)
  35                 port_ops->maskproc(drive, mask);
  36 }
  37
  38 u8 ide_read_error(ide_drive_t *drive)
  39 {
  40         struct ide_taskfile tf;
  41
  42         drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_ERROR);
  43
  44         return tf.error;
  45 }
  46 EXPORT_SYMBOL_GPL(ide_read_error);
  47
  48 void ide_fix_driveid(u16 *id)
  49 {
  50 #ifndef __LITTLE_ENDIAN
  51 # ifdef __BIG_ENDIAN
  52         int i;
  53
  54         for (i = 0; i < 256; i++)
  55                 id[i] = __le16_to_cpu(id[i]);
  56 # else
  57 #  error "Please fix <asm/byteorder.h>"
  58 # endif
  59 #endif
  60 }
  61
  62 /*
  63  * ide_fixstring() cleans up and (optionally) byte-swaps a text string,
  64  * removing leading/trailing blanks and compressing internal blanks.
  65  * It is primarily used to tidy up the model name/number fields as
  66  * returned by the ATA_CMD_ID_ATA[PI] commands.
  67  */
  68
  69 void ide_fixstring(u8 *s, const int bytecount, const int byteswap)
  70 {
  71         u8 *p, *end = &s[bytecount & ~1]; /* bytecount must be even */
  72
  73         if (byteswap) {
  74                 /* convert from big-endian to host byte order */
  75                 for (p = s ; p != end ; p += 2)
  76                         be16_to_cpus((u16 *) p);
  77         }
  78
  79         /* strip leading blanks */
  80         p = s;
  81         while (s != end && *s == ' ')
  82                 ++s;
  83         /* compress internal blanks and strip trailing blanks */
  84         while (s != end && *s) {
  85                 if (*s++ != ' ' || (s != end && *s && *s != ' '))
  86                         *p++ = *(s-1);
  87         }
  88         /* wipe out trailing garbage */
  89         while (p != end)
  90                 *p++ = '\0';
  91 }
  92 EXPORT_SYMBOL(ide_fixstring);
  93
  94 /*
  95  * This routine busy-waits for the drive status to be not "busy".
  96  * It then checks the status for all of the "good" bits and none
  97  * of the "bad" bits, and if all is okay it returns 0.  All other
  98  * cases return error -- caller may then invoke ide_error().
  99  *
 100  * This routine should get fixed to not hog the cpu during extra long waits..
 101  * That could be done by busy-waiting for the first jiffy or two, and then
 102  * setting a timer to wake up at half second intervals thereafter,
 103  * until timeout is achieved, before timing out.
 104  */
 105 int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad,
 106                     unsigned long timeout, u8 *rstat)
 107 {
 108         ide_hwif_t *hwif = drive->hwif;
 109         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 110         unsigned long flags;
 111         int i;
 112         u8 stat;
 113
 114         udelay(1);      /* spec allows drive 400ns to assert "BUSY" */
 115         stat = tp_ops->read_status(hwif);
 116
 117         if (stat & ATA_BUSY) {
 118                 local_save_flags(flags);
 119                 local_irq_enable_in_hardirq();
 120                 timeout += jiffies;
 121                 while ((stat = tp_ops->read_status(hwif)) & ATA_BUSY) {
 122                         if (time_after(jiffies, timeout)) {
 123                                 /*
 124                                  * One last read after the timeout in case
 125                                  * heavy interrupt load made us not make any
 126                                  * progress during the timeout..
 127                                  */
 128                                 stat = tp_ops->read_status(hwif);
 129                                 if ((stat & ATA_BUSY) == 0)
 130                                         break;
 131
 132                                 local_irq_restore(flags);
 133                                 *rstat = stat;
 134                                 return -EBUSY;
 135                         }
 136                 }
 137                 local_irq_restore(flags);
 138         }
 139         /*
 140          * Allow status to settle, then read it again.
 141          * A few rare drives vastly violate the 400ns spec here,
 142          * so we'll wait up to 10usec for a "good" status
 143          * rather than expensively fail things immediately.
 144          * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 145          */
 146         for (i = 0; i < 10; i++) {
 147                 udelay(1);
 148                 stat = tp_ops->read_status(hwif);
 149
 150                 if (OK_STAT(stat, good, bad)) {
 151                         *rstat = stat;
 152                         return 0;
 153                 }
 154         }
 155         *rstat = stat;
 156         return -EFAULT;
 157 }
 158
 159 /*
 160  * In case of error returns error value after doing "*startstop = ide_error()".
 161  * The caller should return the updated value of "startstop" in this case,
 162  * "startstop" is unchanged when the function returns 0.
 163  */
 164 int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good,
 165                   u8 bad, unsigned long timeout)
 166 {
 167         int err;
 168         u8 stat;
 169
 170         /* bail early if we've exceeded max_failures */
 171         if (drive->max_failures && (drive->failures > drive->max_failures)) {
 172                 *startstop = ide_stopped;
 173                 return 1;
 174         }
 175
 176         err = __ide_wait_stat(drive, good, bad, timeout, &stat);
 177
 178         if (err) {
 179                 char *s = (err == -EBUSY) ? "status timeout" : "status error";
 180                 *startstop = ide_error(drive, s, stat);
 181         }
 182
 183         return err;
 184 }
 185 EXPORT_SYMBOL(ide_wait_stat);
 186
 187 /**
 188  *      ide_in_drive_list       -       look for drive in black/white list
 189  *      @id: drive identifier
 190  *      @table: list to inspect
 191  *
 192  *      Look for a drive in the blacklist and the whitelist tables
 193  *      Returns 1 if the drive is found in the table.
 194  */
 195
 196 int ide_in_drive_list(u16 *id, const struct drive_list_entry *table)
 197 {
 198         for ( ; table->id_model; table++)
 199                 if ((!strcmp(table->id_model, (char *)&id[ATA_ID_PROD])) &&
 200                     (!table->id_firmware ||
 201                      strstr((char *)&id[ATA_ID_FW_REV], table->id_firmware)))
 202                         return 1;
 203         return 0;
 204 }
 205 EXPORT_SYMBOL_GPL(ide_in_drive_list);
 206
 207 /*
 208  * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid.
 209  * Some optical devices with the buggy firmwares have the same problem.
 210  */
 211 static const struct drive_list_entry ivb_list[] = {
 212         { "QUANTUM FIREBALLlct10 05"    , "A03.0900"    },
 213         { "QUANTUM FIREBALLlct20 30"    , "APL.0900"    },
 214         { "TSSTcorp CDDVDW SH-S202J"    , "SB00"        },
 215         { "TSSTcorp CDDVDW SH-S202J"    , "SB01"        },
 216         { "TSSTcorp CDDVDW SH-S202N"    , "SB00"        },
 217         { "TSSTcorp CDDVDW SH-S202N"    , "SB01"        },
 218         { "TSSTcorp CDDVDW SH-S202H"    , "SB00"        },
 219         { "TSSTcorp CDDVDW SH-S202H"    , "SB01"        },
 220         { "SAMSUNG SP0822N"             , "WA100-10"    },
 221         { NULL                          , NULL          }
 222 };
 223
 224 /*
 225  *  All hosts that use the 80c ribbon must use!
 226  *  The name is derived from upper byte of word 93 and the 80c ribbon.
 227  */
 228 u8 eighty_ninty_three(ide_drive_t *drive)
 229 {
 230         ide_hwif_t *hwif = drive->hwif;
 231         u16 *id = drive->id;
 232         int ivb = ide_in_drive_list(id, ivb_list);
 233
 234         if (hwif->cbl == ATA_CBL_PATA40_SHORT)
 235                 return 1;
 236
 237         if (ivb)
 238                 printk(KERN_DEBUG "%s: skipping word 93 validity check\n",
 239                                   drive->name);
 240
 241         if (ata_id_is_sata(id) && !ivb)
 242                 return 1;
 243
 244         if (hwif->cbl != ATA_CBL_PATA80 && !ivb)
 245                 goto no_80w;
 246
 247         /*
 248          * FIXME:
 249          * - change master/slave IDENTIFY order
 250          * - force bit13 (80c cable present) check also for !ivb devices
 251          *   (unless the slave device is pre-ATA3)
 252          */
 253         if (id[ATA_ID_HW_CONFIG] & 0x4000)
 254                 return 1;
 255
 256         if (ivb) {
 257                 const char *model = (char *)&id[ATA_ID_PROD];
 258
 259                 if (strstr(model, "TSSTcorp CDDVDW SH-S202")) {
 260                         /*
 261                          * These ATAPI devices always report 80c cable
 262                          * so we have to depend on the host in this case.
 263                          */
 264                         if (hwif->cbl == ATA_CBL_PATA80)
 265                                 return 1;
 266                 } else {
 267                         /* Depend on the device side cable detection. */
 268                         if (id[ATA_ID_HW_CONFIG] & 0x2000)
 269                                 return 1;
 270                 }
 271         }
 272 no_80w:
 273         if (drive->dev_flags & IDE_DFLAG_UDMA33_WARNED)
 274                 return 0;
 275
 276         printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, "
 277                             "limiting max speed to UDMA33\n",
 278                             drive->name,
 279                             hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host");
 280
 281         drive->dev_flags |= IDE_DFLAG_UDMA33_WARNED;
 282
 283         return 0;
 284 }
 285
 286 static const char *nien_quirk_list[] = {
 287         "QUANTUM FIREBALLlct08 08",
 288         "QUANTUM FIREBALLP KA6.4",
 289         "QUANTUM FIREBALLP KA9.1",
 290         "QUANTUM FIREBALLP KX13.6",
 291         "QUANTUM FIREBALLP KX20.5",
 292         "QUANTUM FIREBALLP KX27.3",
 293         "QUANTUM FIREBALLP LM20.4",
 294         "QUANTUM FIREBALLP LM20.5",
 295         NULL
 296 };
 297
 298 void ide_check_nien_quirk_list(ide_drive_t *drive)
 299 {
 300         const char **list, *m = (char *)&drive->id[ATA_ID_PROD];
 301
 302         for (list = nien_quirk_list; *list != NULL; list++)
 303                 if (strstr(m, *list) != NULL) {
 304                         drive->dev_flags |= IDE_DFLAG_NIEN_QUIRK;
 305                         return;
 306                 }
 307 }
 308
 309 int ide_driveid_update(ide_drive_t *drive)
 310 {
 311         u16 *id;
 312         int rc;
 313
 314         id = kmalloc(SECTOR_SIZE, GFP_ATOMIC);
 315         if (id == NULL)
 316                 return 0;
 317
 318         SELECT_MASK(drive, 1);
 319         rc = ide_dev_read_id(drive, ATA_CMD_ID_ATA, id, 1);
 320         SELECT_MASK(drive, 0);
 321
 322         if (rc)
 323                 goto out_err;
 324
 325         drive->id[ATA_ID_UDMA_MODES]  = id[ATA_ID_UDMA_MODES];
 326         drive->id[ATA_ID_MWDMA_MODES] = id[ATA_ID_MWDMA_MODES];
 327         drive->id[ATA_ID_SWDMA_MODES] = id[ATA_ID_SWDMA_MODES];
 328         drive->id[ATA_ID_CFA_MODES]   = id[ATA_ID_CFA_MODES];
 329         /* anything more ? */
 330
 331         kfree(id);
 332
 333         return 1;
 334 out_err:
 335         if (rc == 2)
 336                 printk(KERN_ERR "%s: %s: bad status\n", drive->name, __func__);
 337         kfree(id);
 338         return 0;
 339 }
 340
 341 int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
 342 {
 343         ide_hwif_t *hwif = drive->hwif;
 344         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 345         struct ide_taskfile tf;
 346         u16 *id = drive->id, i;
 347         int error = 0;
 348         u8 stat;
 349
 350 #ifdef CONFIG_BLK_DEV_IDEDMA
 351         if (hwif->dma_ops)      /* check if host supports DMA */
 352                 hwif->dma_ops->dma_host_set(drive, 0);
 353 #endif
 354
 355         /* Skip setting PIO flow-control modes on pre-EIDE drives */
 356         if ((speed & 0xf8) == XFER_PIO_0 && ata_id_has_iordy(drive->id) == 0)
 357                 goto skip;
 358
 359         /*
 360          * Don't use ide_wait_cmd here - it will
 361          * attempt to set_geometry and recalibrate,
 362          * but for some reason these don't work at
 363          * this point (lost interrupt).
 364          */
 365
 366         udelay(1);
 367         tp_ops->dev_select(drive);
 368         SELECT_MASK(drive, 1);
 369         udelay(1);
 370         tp_ops->write_devctl(hwif, ATA_NIEN | ATA_DEVCTL_OBS);
 371
 372         memset(&tf, 0, sizeof(tf));
 373         tf.feature = SETFEATURES_XFER;
 374         tf.nsect   = speed;
 375
 376         tp_ops->tf_load(drive, &tf, IDE_VALID_FEATURE | IDE_VALID_NSECT);
 377
 378         tp_ops->exec_command(hwif, ATA_CMD_SET_FEATURES);
 379
 380         if (drive->dev_flags & IDE_DFLAG_NIEN_QUIRK)
 381                 tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
 382
 383         error = __ide_wait_stat(drive, drive->ready_stat,
 384                                 ATA_BUSY | ATA_DRQ | ATA_ERR,
 385                                 WAIT_CMD, &stat);
 386
 387         SELECT_MASK(drive, 0);
 388
 389         if (error) {
 390                 (void) ide_dump_status(drive, "set_drive_speed_status", stat);
 391                 return error;
 392         }
 393
 394         if (speed >= XFER_SW_DMA_0) {
 395                 id[ATA_ID_UDMA_MODES]  &= ~0xFF00;
 396                 id[ATA_ID_MWDMA_MODES] &= ~0x0700;
 397                 id[ATA_ID_SWDMA_MODES] &= ~0x0700;
 398                 if (ata_id_is_cfa(id))
 399                         id[ATA_ID_CFA_MODES] &= ~0x0E00;
 400         } else  if (ata_id_is_cfa(id))
 401                 id[ATA_ID_CFA_MODES] &= ~0x01C0;
 402
 403  skip:
 404 #ifdef CONFIG_BLK_DEV_IDEDMA
 405         if (speed >= XFER_SW_DMA_0 && (drive->dev_flags & IDE_DFLAG_USING_DMA))
 406                 hwif->dma_ops->dma_host_set(drive, 1);
 407         else if (hwif->dma_ops) /* check if host supports DMA */
 408                 ide_dma_off_quietly(drive);
 409 #endif
 410
 411         if (speed >= XFER_UDMA_0) {
 412                 i = 1 << (speed - XFER_UDMA_0);
 413                 id[ATA_ID_UDMA_MODES] |= (i << 8 | i);
 414         } else if (ata_id_is_cfa(id) && speed >= XFER_MW_DMA_3) {
 415                 i = speed - XFER_MW_DMA_2;
 416                 id[ATA_ID_CFA_MODES] |= i << 9;
 417         } else if (speed >= XFER_MW_DMA_0) {
 418                 i = 1 << (speed - XFER_MW_DMA_0);
 419                 id[ATA_ID_MWDMA_MODES] |= (i << 8 | i);
 420         } else if (speed >= XFER_SW_DMA_0) {
 421                 i = 1 << (speed - XFER_SW_DMA_0);
 422                 id[ATA_ID_SWDMA_MODES] |= (i << 8 | i);
 423         } else if (ata_id_is_cfa(id) && speed >= XFER_PIO_5) {
 424                 i = speed - XFER_PIO_4;
 425                 id[ATA_ID_CFA_MODES] |= i << 6;
 426         }
 427
 428         if (!drive->init_speed)
 429                 drive->init_speed = speed;
 430         drive->current_speed = speed;
 431         return error;
 432 }
 433
 434 /*
 435  * This should get invoked any time we exit the driver to
 436  * wait for an interrupt response from a drive.  handler() points
 437  * at the appropriate code to handle the next interrupt, and a
 438  * timer is started to prevent us from waiting forever in case
 439  * something goes wrong (see the ide_timer_expiry() handler later on).
 440  *
 441  * See also ide_execute_command
 442  */
 443 void __ide_set_handler(ide_drive_t *drive, ide_handler_t *handler,
 444                        unsigned int timeout)
 445 {
 446         ide_hwif_t *hwif = drive->hwif;
 447
 448         BUG_ON(hwif->handler);
 449         hwif->handler           = handler;
 450         hwif->timer.expires     = jiffies + timeout;
 451         hwif->req_gen_timer     = hwif->req_gen;
 452         add_timer(&hwif->timer);
 453 }
 454
 455 void ide_set_handler(ide_drive_t *drive, ide_handler_t *handler,
 456                      unsigned int timeout)
 457 {
 458         ide_hwif_t *hwif = drive->hwif;
 459         unsigned long flags;
 460
 461         spin_lock_irqsave(&hwif->lock, flags);
 462         __ide_set_handler(drive, handler, timeout);
 463         spin_unlock_irqrestore(&hwif->lock, flags);
 464 }
 465 EXPORT_SYMBOL(ide_set_handler);
 466
 467 /**
 468  *      ide_execute_command     -       execute an IDE command
 469  *      @drive: IDE drive to issue the command against
 470  *      @cmd: command
 471  *      @handler: handler for next phase
 472  *      @timeout: timeout for command
 473  *
 474  *      Helper function to issue an IDE command. This handles the
 475  *      atomicity requirements, command timing and ensures that the
 476  *      handler and IRQ setup do not race. All IDE command kick off
 477  *      should go via this function or do equivalent locking.
 478  */
 479
 480 void ide_execute_command(ide_drive_t *drive, struct ide_cmd *cmd,
 481                          ide_handler_t *handler, unsigned timeout)
 482 {
 483         ide_hwif_t *hwif = drive->hwif;
 484         unsigned long flags;
 485
 486         spin_lock_irqsave(&hwif->lock, flags);
 487         if ((cmd->protocol != ATAPI_PROT_DMA &&
 488              cmd->protocol != ATAPI_PROT_PIO) ||
 489             (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT))
 490                 __ide_set_handler(drive, handler, timeout);
 491         hwif->tp_ops->exec_command(hwif, cmd->tf.command);
 492         /*
 493          * Drive takes 400nS to respond, we must avoid the IRQ being
 494          * serviced before that.
 495          *
 496          * FIXME: we could skip this delay with care on non shared devices
 497          */
 498         ndelay(400);
 499         spin_unlock_irqrestore(&hwif->lock, flags);
 500 }
 501
 502 /*
 503  * ide_wait_not_busy() waits for the currently selected device on the hwif
 504  * to report a non-busy status, see comments in ide_probe_port().
 505  */
 506 int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
 507 {
 508         u8 stat = 0;
 509
 510         while (timeout--) {
 511                 /*
 512                  * Turn this into a schedule() sleep once I'm sure
 513                  * about locking issues (2.5 work ?).
 514                  */
 515                 mdelay(1);
 516                 stat = hwif->tp_ops->read_status(hwif);
 517                 if ((stat & ATA_BUSY) == 0)
 518                         return 0;
 519                 /*
 520                  * Assume a value of 0xff means nothing is connected to
 521                  * the interface and it doesn't implement the pull-down
 522                  * resistor on D7.
 523                  */
 524                 if (stat == 0xff)
 525                         return -ENODEV;
 526                 touch_softlockup_watchdog();
 527                 touch_nmi_watchdog();
 528         }
 529         return -EBUSY;
 530 }