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