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