drivers/ide/ide-iops.c

   1 /*
   2  *  Copyright (C) 2000-2002     Andre Hedrick <andre@linux-ide.org>
   3  *  Copyright (C) 2003          Red Hat <alan@redhat.com>
   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/hdreg.h>
  22 #include <linux/ide.h>
  23 #include <linux/bitops.h>
  24 #include <linux/nmi.h>
  25
  26 #include <asm/byteorder.h>
  27 #include <asm/irq.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/io.h>
  30
  31 /*
  32  *      Conventional PIO operations for ATA devices
  33  */
  34
  35 static u8 ide_inb (unsigned long port)
  36 {
  37         return (u8) inb(port);
  38 }
  39
  40 static u16 ide_inw (unsigned long port)
  41 {
  42         return (u16) inw(port);
  43 }
  44
  45 static void ide_insw (unsigned long port, void *addr, u32 count)
  46 {
  47         insw(port, addr, count);
  48 }
  49
  50 static void ide_insl (unsigned long port, void *addr, u32 count)
  51 {
  52         insl(port, addr, count);
  53 }
  54
  55 static void ide_outb (u8 val, unsigned long port)
  56 {
  57         outb(val, port);
  58 }
  59
  60 static void ide_outbsync (ide_drive_t *drive, u8 addr, unsigned long port)
  61 {
  62         outb(addr, port);
  63 }
  64
  65 static void ide_outw (u16 val, unsigned long port)
  66 {
  67         outw(val, port);
  68 }
  69
  70 static void ide_outsw (unsigned long port, void *addr, u32 count)
  71 {
  72         outsw(port, addr, count);
  73 }
  74
  75 static void ide_outsl (unsigned long port, void *addr, u32 count)
  76 {
  77         outsl(port, addr, count);
  78 }
  79
  80 void default_hwif_iops (ide_hwif_t *hwif)
  81 {
  82         hwif->OUTB      = ide_outb;
  83         hwif->OUTBSYNC  = ide_outbsync;
  84         hwif->OUTW      = ide_outw;
  85         hwif->OUTSW     = ide_outsw;
  86         hwif->OUTSL     = ide_outsl;
  87         hwif->INB       = ide_inb;
  88         hwif->INW       = ide_inw;
  89         hwif->INSW      = ide_insw;
  90         hwif->INSL      = ide_insl;
  91 }
  92
  93 /*
  94  *      MMIO operations, typically used for SATA controllers
  95  */
  96
  97 static u8 ide_mm_inb (unsigned long port)
  98 {
  99         return (u8) readb((void __iomem *) port);
 100 }
 101
 102 static u16 ide_mm_inw (unsigned long port)
 103 {
 104         return (u16) readw((void __iomem *) port);
 105 }
 106
 107 static void ide_mm_insw (unsigned long port, void *addr, u32 count)
 108 {
 109         __ide_mm_insw((void __iomem *) port, addr, count);
 110 }
 111
 112 static void ide_mm_insl (unsigned long port, void *addr, u32 count)
 113 {
 114         __ide_mm_insl((void __iomem *) port, addr, count);
 115 }
 116
 117 static void ide_mm_outb (u8 value, unsigned long port)
 118 {
 119         writeb(value, (void __iomem *) port);
 120 }
 121
 122 static void ide_mm_outbsync (ide_drive_t *drive, u8 value, unsigned long port)
 123 {
 124         writeb(value, (void __iomem *) port);
 125 }
 126
 127 static void ide_mm_outw (u16 value, unsigned long port)
 128 {
 129         writew(value, (void __iomem *) port);
 130 }
 131
 132 static void ide_mm_outsw (unsigned long port, void *addr, u32 count)
 133 {
 134         __ide_mm_outsw((void __iomem *) port, addr, count);
 135 }
 136
 137 static void ide_mm_outsl (unsigned long port, void *addr, u32 count)
 138 {
 139         __ide_mm_outsl((void __iomem *) port, addr, count);
 140 }
 141
 142 void default_hwif_mmiops (ide_hwif_t *hwif)
 143 {
 144         hwif->OUTB      = ide_mm_outb;
 145         /* Most systems will need to override OUTBSYNC, alas however
 146            this one is controller specific! */
 147         hwif->OUTBSYNC  = ide_mm_outbsync;
 148         hwif->OUTW      = ide_mm_outw;
 149         hwif->OUTSW     = ide_mm_outsw;
 150         hwif->OUTSL     = ide_mm_outsl;
 151         hwif->INB       = ide_mm_inb;
 152         hwif->INW       = ide_mm_inw;
 153         hwif->INSW      = ide_mm_insw;
 154         hwif->INSL      = ide_mm_insl;
 155 }
 156
 157 EXPORT_SYMBOL(default_hwif_mmiops);
 158
 159 void SELECT_DRIVE (ide_drive_t *drive)
 160 {
 161         if (HWIF(drive)->selectproc)
 162                 HWIF(drive)->selectproc(drive);
 163         HWIF(drive)->OUTB(drive->select.all, IDE_SELECT_REG);
 164 }
 165
 166 EXPORT_SYMBOL(SELECT_DRIVE);
 167
 168 void SELECT_MASK (ide_drive_t *drive, int mask)
 169 {
 170         if (HWIF(drive)->maskproc)
 171                 HWIF(drive)->maskproc(drive, mask);
 172 }
 173
 174 /*
 175  * Some localbus EIDE interfaces require a special access sequence
 176  * when using 32-bit I/O instructions to transfer data.  We call this
 177  * the "vlb_sync" sequence, which consists of three successive reads
 178  * of the sector count register location, with interrupts disabled
 179  * to ensure that the reads all happen together.
 180  */
 181 static void ata_vlb_sync(ide_drive_t *drive, unsigned long port)
 182 {
 183         (void) HWIF(drive)->INB(port);
 184         (void) HWIF(drive)->INB(port);
 185         (void) HWIF(drive)->INB(port);
 186 }
 187
 188 /*
 189  * This is used for most PIO data transfers *from* the IDE interface
 190  */
 191 static void ata_input_data(ide_drive_t *drive, void *buffer, u32 wcount)
 192 {
 193         ide_hwif_t *hwif        = HWIF(drive);
 194         u8 io_32bit             = drive->io_32bit;
 195
 196         if (io_32bit) {
 197                 if (io_32bit & 2) {
 198                         unsigned long flags;
 199                         local_irq_save(flags);
 200                         ata_vlb_sync(drive, IDE_NSECTOR_REG);
 201                         hwif->INSL(IDE_DATA_REG, buffer, wcount);
 202                         local_irq_restore(flags);
 203                 } else
 204                         hwif->INSL(IDE_DATA_REG, buffer, wcount);
 205         } else {
 206                 hwif->INSW(IDE_DATA_REG, buffer, wcount<<1);
 207         }
 208 }
 209
 210 /*
 211  * This is used for most PIO data transfers *to* the IDE interface
 212  */
 213 static void ata_output_data(ide_drive_t *drive, void *buffer, u32 wcount)
 214 {
 215         ide_hwif_t *hwif        = HWIF(drive);
 216         u8 io_32bit             = drive->io_32bit;
 217
 218         if (io_32bit) {
 219                 if (io_32bit & 2) {
 220                         unsigned long flags;
 221                         local_irq_save(flags);
 222                         ata_vlb_sync(drive, IDE_NSECTOR_REG);
 223                         hwif->OUTSL(IDE_DATA_REG, buffer, wcount);
 224                         local_irq_restore(flags);
 225                 } else
 226                         hwif->OUTSL(IDE_DATA_REG, buffer, wcount);
 227         } else {
 228                 hwif->OUTSW(IDE_DATA_REG, buffer, wcount<<1);
 229         }
 230 }
 231
 232 /*
 233  * The following routines are mainly used by the ATAPI drivers.
 234  *
 235  * These routines will round up any request for an odd number of bytes,
 236  * so if an odd bytecount is specified, be sure that there's at least one
 237  * extra byte allocated for the buffer.
 238  */
 239
 240 static void atapi_input_bytes(ide_drive_t *drive, void *buffer, u32 bytecount)
 241 {
 242         ide_hwif_t *hwif = HWIF(drive);
 243
 244         ++bytecount;
 245 #if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
 246         if (MACH_IS_ATARI || MACH_IS_Q40) {
 247                 /* Atari has a byte-swapped IDE interface */
 248                 insw_swapw(IDE_DATA_REG, buffer, bytecount / 2);
 249                 return;
 250         }
 251 #endif /* CONFIG_ATARI || CONFIG_Q40 */
 252         hwif->ata_input_data(drive, buffer, bytecount / 4);
 253         if ((bytecount & 0x03) >= 2)
 254                 hwif->INSW(IDE_DATA_REG, ((u8 *)buffer)+(bytecount & ~0x03), 1);
 255 }
 256
 257 static void atapi_output_bytes(ide_drive_t *drive, void *buffer, u32 bytecount)
 258 {
 259         ide_hwif_t *hwif = HWIF(drive);
 260
 261         ++bytecount;
 262 #if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
 263         if (MACH_IS_ATARI || MACH_IS_Q40) {
 264                 /* Atari has a byte-swapped IDE interface */
 265                 outsw_swapw(IDE_DATA_REG, buffer, bytecount / 2);
 266                 return;
 267         }
 268 #endif /* CONFIG_ATARI || CONFIG_Q40 */
 269         hwif->ata_output_data(drive, buffer, bytecount / 4);
 270         if ((bytecount & 0x03) >= 2)
 271                 hwif->OUTSW(IDE_DATA_REG, ((u8*)buffer)+(bytecount & ~0x03), 1);
 272 }
 273
 274 void default_hwif_transport(ide_hwif_t *hwif)
 275 {
 276         hwif->ata_input_data            = ata_input_data;
 277         hwif->ata_output_data           = ata_output_data;
 278         hwif->atapi_input_bytes         = atapi_input_bytes;
 279         hwif->atapi_output_bytes        = atapi_output_bytes;
 280 }
 281
 282 void ide_fix_driveid (struct hd_driveid *id)
 283 {
 284 #ifndef __LITTLE_ENDIAN
 285 # ifdef __BIG_ENDIAN
 286         int i;
 287         u16 *stringcast;
 288
 289         id->config         = __le16_to_cpu(id->config);
 290         id->cyls           = __le16_to_cpu(id->cyls);
 291         id->reserved2      = __le16_to_cpu(id->reserved2);
 292         id->heads          = __le16_to_cpu(id->heads);
 293         id->track_bytes    = __le16_to_cpu(id->track_bytes);
 294         id->sector_bytes   = __le16_to_cpu(id->sector_bytes);
 295         id->sectors        = __le16_to_cpu(id->sectors);
 296         id->vendor0        = __le16_to_cpu(id->vendor0);
 297         id->vendor1        = __le16_to_cpu(id->vendor1);
 298         id->vendor2        = __le16_to_cpu(id->vendor2);
 299         stringcast = (u16 *)&id->serial_no[0];
 300         for (i = 0; i < (20/2); i++)
 301                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 302         id->buf_type       = __le16_to_cpu(id->buf_type);
 303         id->buf_size       = __le16_to_cpu(id->buf_size);
 304         id->ecc_bytes      = __le16_to_cpu(id->ecc_bytes);
 305         stringcast = (u16 *)&id->fw_rev[0];
 306         for (i = 0; i < (8/2); i++)
 307                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 308         stringcast = (u16 *)&id->model[0];
 309         for (i = 0; i < (40/2); i++)
 310                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 311         id->dword_io       = __le16_to_cpu(id->dword_io);
 312         id->reserved50     = __le16_to_cpu(id->reserved50);
 313         id->field_valid    = __le16_to_cpu(id->field_valid);
 314         id->cur_cyls       = __le16_to_cpu(id->cur_cyls);
 315         id->cur_heads      = __le16_to_cpu(id->cur_heads);
 316         id->cur_sectors    = __le16_to_cpu(id->cur_sectors);
 317         id->cur_capacity0  = __le16_to_cpu(id->cur_capacity0);
 318         id->cur_capacity1  = __le16_to_cpu(id->cur_capacity1);
 319         id->lba_capacity   = __le32_to_cpu(id->lba_capacity);
 320         id->dma_1word      = __le16_to_cpu(id->dma_1word);
 321         id->dma_mword      = __le16_to_cpu(id->dma_mword);
 322         id->eide_pio_modes = __le16_to_cpu(id->eide_pio_modes);
 323         id->eide_dma_min   = __le16_to_cpu(id->eide_dma_min);
 324         id->eide_dma_time  = __le16_to_cpu(id->eide_dma_time);
 325         id->eide_pio       = __le16_to_cpu(id->eide_pio);
 326         id->eide_pio_iordy = __le16_to_cpu(id->eide_pio_iordy);
 327         for (i = 0; i < 2; ++i)
 328                 id->words69_70[i] = __le16_to_cpu(id->words69_70[i]);
 329         for (i = 0; i < 4; ++i)
 330                 id->words71_74[i] = __le16_to_cpu(id->words71_74[i]);
 331         id->queue_depth    = __le16_to_cpu(id->queue_depth);
 332         for (i = 0; i < 4; ++i)
 333                 id->words76_79[i] = __le16_to_cpu(id->words76_79[i]);
 334         id->major_rev_num  = __le16_to_cpu(id->major_rev_num);
 335         id->minor_rev_num  = __le16_to_cpu(id->minor_rev_num);
 336         id->command_set_1  = __le16_to_cpu(id->command_set_1);
 337         id->command_set_2  = __le16_to_cpu(id->command_set_2);
 338         id->cfsse          = __le16_to_cpu(id->cfsse);
 339         id->cfs_enable_1   = __le16_to_cpu(id->cfs_enable_1);
 340         id->cfs_enable_2   = __le16_to_cpu(id->cfs_enable_2);
 341         id->csf_default    = __le16_to_cpu(id->csf_default);
 342         id->dma_ultra      = __le16_to_cpu(id->dma_ultra);
 343         id->trseuc         = __le16_to_cpu(id->trseuc);
 344         id->trsEuc         = __le16_to_cpu(id->trsEuc);
 345         id->CurAPMvalues   = __le16_to_cpu(id->CurAPMvalues);
 346         id->mprc           = __le16_to_cpu(id->mprc);
 347         id->hw_config      = __le16_to_cpu(id->hw_config);
 348         id->acoustic       = __le16_to_cpu(id->acoustic);
 349         id->msrqs          = __le16_to_cpu(id->msrqs);
 350         id->sxfert         = __le16_to_cpu(id->sxfert);
 351         id->sal            = __le16_to_cpu(id->sal);
 352         id->spg            = __le32_to_cpu(id->spg);
 353         id->lba_capacity_2 = __le64_to_cpu(id->lba_capacity_2);
 354         for (i = 0; i < 22; i++)
 355                 id->words104_125[i]   = __le16_to_cpu(id->words104_125[i]);
 356         id->last_lun       = __le16_to_cpu(id->last_lun);
 357         id->word127        = __le16_to_cpu(id->word127);
 358         id->dlf            = __le16_to_cpu(id->dlf);
 359         id->csfo           = __le16_to_cpu(id->csfo);
 360         for (i = 0; i < 26; i++)
 361                 id->words130_155[i] = __le16_to_cpu(id->words130_155[i]);
 362         id->word156        = __le16_to_cpu(id->word156);
 363         for (i = 0; i < 3; i++)
 364                 id->words157_159[i] = __le16_to_cpu(id->words157_159[i]);
 365         id->cfa_power      = __le16_to_cpu(id->cfa_power);
 366         for (i = 0; i < 14; i++)
 367                 id->words161_175[i] = __le16_to_cpu(id->words161_175[i]);
 368         for (i = 0; i < 31; i++)
 369                 id->words176_205[i] = __le16_to_cpu(id->words176_205[i]);
 370         for (i = 0; i < 48; i++)
 371                 id->words206_254[i] = __le16_to_cpu(id->words206_254[i]);
 372         id->integrity_word  = __le16_to_cpu(id->integrity_word);
 373 # else
 374 #  error "Please fix <asm/byteorder.h>"
 375 # endif
 376 #endif
 377 }
 378
 379 /*
 380  * ide_fixstring() cleans up and (optionally) byte-swaps a text string,
 381  * removing leading/trailing blanks and compressing internal blanks.
 382  * It is primarily used to tidy up the model name/number fields as
 383  * returned by the WIN_[P]IDENTIFY commands.
 384  */
 385
 386 void ide_fixstring (u8 *s, const int bytecount, const int byteswap)
 387 {
 388         u8 *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
 389
 390         if (byteswap) {
 391                 /* convert from big-endian to host byte order */
 392                 for (p = end ; p != s;) {
 393                         unsigned short *pp = (unsigned short *) (p -= 2);
 394                         *pp = ntohs(*pp);
 395                 }
 396         }
 397         /* strip leading blanks */
 398         while (s != end && *s == ' ')
 399                 ++s;
 400         /* compress internal blanks and strip trailing blanks */
 401         while (s != end && *s) {
 402                 if (*s++ != ' ' || (s != end && *s && *s != ' '))
 403                         *p++ = *(s-1);
 404         }
 405         /* wipe out trailing garbage */
 406         while (p != end)
 407                 *p++ = '\0';
 408 }
 409
 410 EXPORT_SYMBOL(ide_fixstring);
 411
 412 /*
 413  * Needed for PCI irq sharing
 414  */
 415 int drive_is_ready (ide_drive_t *drive)
 416 {
 417         ide_hwif_t *hwif        = HWIF(drive);
 418         u8 stat                 = 0;
 419
 420         if (drive->waiting_for_dma)
 421                 return hwif->ide_dma_test_irq(drive);
 422
 423 #if 0
 424         /* need to guarantee 400ns since last command was issued */
 425         udelay(1);
 426 #endif
 427
 428         /*
 429          * We do a passive status test under shared PCI interrupts on
 430          * cards that truly share the ATA side interrupt, but may also share
 431          * an interrupt with another pci card/device.  We make no assumptions
 432          * about possible isa-pnp and pci-pnp issues yet.
 433          */
 434         if (IDE_CONTROL_REG)
 435                 stat = hwif->INB(IDE_ALTSTATUS_REG);
 436         else
 437                 /* Note: this may clear a pending IRQ!! */
 438                 stat = hwif->INB(IDE_STATUS_REG);
 439
 440         if (stat & BUSY_STAT)
 441                 /* drive busy:  definitely not interrupting */
 442                 return 0;
 443
 444         /* drive ready: *might* be interrupting */
 445         return 1;
 446 }
 447
 448 EXPORT_SYMBOL(drive_is_ready);
 449
 450 /*
 451  * This routine busy-waits for the drive status to be not "busy".
 452  * It then checks the status for all of the "good" bits and none
 453  * of the "bad" bits, and if all is okay it returns 0.  All other
 454  * cases return error -- caller may then invoke ide_error().
 455  *
 456  * This routine should get fixed to not hog the cpu during extra long waits..
 457  * That could be done by busy-waiting for the first jiffy or two, and then
 458  * setting a timer to wake up at half second intervals thereafter,
 459  * until timeout is achieved, before timing out.
 460  */
 461 static int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout, u8 *rstat)
 462 {
 463         ide_hwif_t *hwif = drive->hwif;
 464         unsigned long flags;
 465         int i;
 466         u8 stat;
 467
 468         udelay(1);      /* spec allows drive 400ns to assert "BUSY" */
 469         if ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 470                 local_irq_set(flags);
 471                 timeout += jiffies;
 472                 while ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 473                         if (time_after(jiffies, timeout)) {
 474                                 /*
 475                                  * One last read after the timeout in case
 476                                  * heavy interrupt load made us not make any
 477                                  * progress during the timeout..
 478                                  */
 479                                 stat = hwif->INB(IDE_STATUS_REG);
 480                                 if (!(stat & BUSY_STAT))
 481                                         break;
 482
 483                                 local_irq_restore(flags);
 484                                 *rstat = stat;
 485                                 return -EBUSY;
 486                         }
 487                 }
 488                 local_irq_restore(flags);
 489         }
 490         /*
 491          * Allow status to settle, then read it again.
 492          * A few rare drives vastly violate the 400ns spec here,
 493          * so we'll wait up to 10usec for a "good" status
 494          * rather than expensively fail things immediately.
 495          * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 496          */
 497         for (i = 0; i < 10; i++) {
 498                 udelay(1);
 499                 if (OK_STAT((stat = hwif->INB(IDE_STATUS_REG)), good, bad)) {
 500                         *rstat = stat;
 501                         return 0;
 502                 }
 503         }
 504         *rstat = stat;
 505         return -EFAULT;
 506 }
 507
 508 /*
 509  * In case of error returns error value after doing "*startstop = ide_error()".
 510  * The caller should return the updated value of "startstop" in this case,
 511  * "startstop" is unchanged when the function returns 0.
 512  */
 513 int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout)
 514 {
 515         int err;
 516         u8 stat;
 517
 518         /* bail early if we've exceeded max_failures */
 519         if (drive->max_failures && (drive->failures > drive->max_failures)) {
 520                 *startstop = ide_stopped;
 521                 return 1;
 522         }
 523
 524         err = __ide_wait_stat(drive, good, bad, timeout, &stat);
 525
 526         if (err) {
 527                 char *s = (err == -EBUSY) ? "status timeout" : "status error";
 528                 *startstop = ide_error(drive, s, stat);
 529         }
 530
 531         return err;
 532 }
 533
 534 EXPORT_SYMBOL(ide_wait_stat);
 535
 536 /**
 537  *      ide_in_drive_list       -       look for drive in black/white list
 538  *      @id: drive identifier
 539  *      @drive_table: list to inspect
 540  *
 541  *      Look for a drive in the blacklist and the whitelist tables
 542  *      Returns 1 if the drive is found in the table.
 543  */
 544
 545 int ide_in_drive_list(struct hd_driveid *id, const struct drive_list_entry *drive_table)
 546 {
 547         for ( ; drive_table->id_model; drive_table++)
 548                 if ((!strcmp(drive_table->id_model, id->model)) &&
 549                     (!drive_table->id_firmware ||
 550                      strstr(id->fw_rev, drive_table->id_firmware)))
 551                         return 1;
 552         return 0;
 553 }
 554
 555 EXPORT_SYMBOL_GPL(ide_in_drive_list);
 556
 557 /*
 558  * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid.
 559  * We list them here and depend on the device side cable detection for them.
 560  *
 561  * Some optical devices with the buggy firmwares have the same problem.
 562  */
 563 static const struct drive_list_entry ivb_list[] = {
 564         { "QUANTUM FIREBALLlct10 05"    , "A03.0900"    },
 565         { "TSSTcorp CDDVDW SH-S202J"    , "SB00"        },
 566         { "TSSTcorp CDDVDW SH-S202J"    , "SB01"        },
 567         { "TSSTcorp CDDVDW SH-S202N"    , "SB00"        },
 568         { "TSSTcorp CDDVDW SH-S202N"    , "SB01"        },
 569         { NULL                          , NULL          }
 570 };
 571
 572 /*
 573  *  All hosts that use the 80c ribbon must use!
 574  *  The name is derived from upper byte of word 93 and the 80c ribbon.
 575  */
 576 u8 eighty_ninty_three (ide_drive_t *drive)
 577 {
 578         ide_hwif_t *hwif = drive->hwif;
 579         struct hd_driveid *id = drive->id;
 580         int ivb = ide_in_drive_list(id, ivb_list);
 581
 582         if (hwif->cbl == ATA_CBL_PATA40_SHORT)
 583                 return 1;
 584
 585         if (ivb)
 586                 printk(KERN_DEBUG "%s: skipping word 93 validity check\n",
 587                                   drive->name);
 588
 589         if (ide_dev_is_sata(id) && !ivb)
 590                 return 1;
 591
 592         if (hwif->cbl != ATA_CBL_PATA80 && !ivb)
 593                 goto no_80w;
 594
 595         /*
 596          * FIXME:
 597          * - force bit13 (80c cable present) check also for !ivb devices
 598          *   (unless the slave device is pre-ATA3)
 599          */
 600         if ((id->hw_config & 0x4000) || (ivb && (id->hw_config & 0x2000)))
 601                 return 1;
 602
 603 no_80w:
 604         if (drive->udma33_warned == 1)
 605                 return 0;
 606
 607         printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, "
 608                             "limiting max speed to UDMA33\n",
 609                             drive->name,
 610                             hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host");
 611
 612         drive->udma33_warned = 1;
 613
 614         return 0;
 615 }
 616
 617 int ide_ata66_check (ide_drive_t *drive, ide_task_t *args)
 618 {
 619         if (args->tf.command == WIN_SETFEATURES &&
 620             args->tf.nsect > XFER_UDMA_2 &&
 621             args->tf.feature == SETFEATURES_XFER) {
 622                 if (eighty_ninty_three(drive) == 0) {
 623                         printk(KERN_WARNING "%s: UDMA speeds >UDMA33 cannot "
 624                                             "be set\n", drive->name);
 625                         return 1;
 626                 }
 627         }
 628
 629         return 0;
 630 }
 631
 632 /*
 633  * Backside of HDIO_DRIVE_CMD call of SETFEATURES_XFER.
 634  * 1 : Safe to update drive->id DMA registers.
 635  * 0 : OOPs not allowed.
 636  */
 637 int set_transfer (ide_drive_t *drive, ide_task_t *args)
 638 {
 639         if (args->tf.command == WIN_SETFEATURES &&
 640             args->tf.nsect >= XFER_SW_DMA_0 &&
 641             args->tf.feature == SETFEATURES_XFER &&
 642             (drive->id->dma_ultra ||
 643              drive->id->dma_mword ||
 644              drive->id->dma_1word))
 645                 return 1;
 646
 647         return 0;
 648 }
 649
 650 #ifdef CONFIG_BLK_DEV_IDEDMA
 651 static u8 ide_auto_reduce_xfer (ide_drive_t *drive)
 652 {
 653         if (!drive->crc_count)
 654                 return drive->current_speed;
 655         drive->crc_count = 0;
 656
 657         switch(drive->current_speed) {
 658                 case XFER_UDMA_7:       return XFER_UDMA_6;
 659                 case XFER_UDMA_6:       return XFER_UDMA_5;
 660                 case XFER_UDMA_5:       return XFER_UDMA_4;
 661                 case XFER_UDMA_4:       return XFER_UDMA_3;
 662                 case XFER_UDMA_3:       return XFER_UDMA_2;
 663                 case XFER_UDMA_2:       return XFER_UDMA_1;
 664                 case XFER_UDMA_1:       return XFER_UDMA_0;
 665                         /*
 666                          * OOPS we do not goto non Ultra DMA modes
 667                          * without iCRC's available we force
 668                          * the system to PIO and make the user
 669                          * invoke the ATA-1 ATA-2 DMA modes.
 670                          */
 671                 case XFER_UDMA_0:
 672                 default:                return XFER_PIO_4;
 673         }
 674 }
 675 #endif /* CONFIG_BLK_DEV_IDEDMA */
 676
 677 int ide_driveid_update(ide_drive_t *drive)
 678 {
 679         ide_hwif_t *hwif = drive->hwif;
 680         struct hd_driveid *id;
 681         unsigned long timeout, flags;
 682
 683         /*
 684          * Re-read drive->id for possible DMA mode
 685          * change (copied from ide-probe.c)
 686          */
 687
 688         SELECT_MASK(drive, 1);
 689         ide_set_irq(drive, 1);
 690         msleep(50);
 691         hwif->OUTB(WIN_IDENTIFY, IDE_COMMAND_REG);
 692         timeout = jiffies + WAIT_WORSTCASE;
 693         do {
 694                 if (time_after(jiffies, timeout)) {
 695                         SELECT_MASK(drive, 0);
 696                         return 0;       /* drive timed-out */
 697                 }
 698                 msleep(50);     /* give drive a breather */
 699         } while (hwif->INB(IDE_ALTSTATUS_REG) & BUSY_STAT);
 700         msleep(50);     /* wait for IRQ and DRQ_STAT */
 701         if (!OK_STAT(hwif->INB(IDE_STATUS_REG),DRQ_STAT,BAD_R_STAT)) {
 702                 SELECT_MASK(drive, 0);
 703                 printk("%s: CHECK for good STATUS\n", drive->name);
 704                 return 0;
 705         }
 706         local_irq_save(flags);
 707         SELECT_MASK(drive, 0);
 708         id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
 709         if (!id) {
 710                 local_irq_restore(flags);
 711                 return 0;
 712         }
 713         ata_input_data(drive, id, SECTOR_WORDS);
 714         (void) hwif->INB(IDE_STATUS_REG);       /* clear drive IRQ */
 715         local_irq_enable();
 716         local_irq_restore(flags);
 717         ide_fix_driveid(id);
 718         if (id) {
 719                 drive->id->dma_ultra = id->dma_ultra;
 720                 drive->id->dma_mword = id->dma_mword;
 721                 drive->id->dma_1word = id->dma_1word;
 722                 /* anything more ? */
 723                 kfree(id);
 724
 725                 if (drive->using_dma && ide_id_dma_bug(drive))
 726                         ide_dma_off(drive);
 727         }
 728
 729         return 1;
 730 }
 731
 732 int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
 733 {
 734         ide_hwif_t *hwif = drive->hwif;
 735         int error = 0;
 736         u8 stat;
 737
 738 //      while (HWGROUP(drive)->busy)
 739 //              msleep(50);
 740
 741 #ifdef CONFIG_BLK_DEV_IDEDMA
 742         if (hwif->dma_host_set) /* check if host supports DMA */
 743                 hwif->dma_host_set(drive, 0);
 744 #endif
 745
 746         /* Skip setting PIO flow-control modes on pre-EIDE drives */
 747         if ((speed & 0xf8) == XFER_PIO_0 && !(drive->id->capability & 0x08))
 748                 goto skip;
 749
 750         /*
 751          * Don't use ide_wait_cmd here - it will
 752          * attempt to set_geometry and recalibrate,
 753          * but for some reason these don't work at
 754          * this point (lost interrupt).
 755          */
 756         /*
 757          * Select the drive, and issue the SETFEATURES command
 758          */
 759         disable_irq_nosync(hwif->irq);
 760
 761         /*
 762          *      FIXME: we race against the running IRQ here if
 763          *      this is called from non IRQ context. If we use
 764          *      disable_irq() we hang on the error path. Work
 765          *      is needed.
 766          */
 767
 768         udelay(1);
 769         SELECT_DRIVE(drive);
 770         SELECT_MASK(drive, 0);
 771         udelay(1);
 772         ide_set_irq(drive, 0);
 773         hwif->OUTB(speed, IDE_NSECTOR_REG);
 774         hwif->OUTB(SETFEATURES_XFER, IDE_FEATURE_REG);
 775         hwif->OUTBSYNC(drive, WIN_SETFEATURES, IDE_COMMAND_REG);
 776         if (drive->quirk_list == 2)
 777                 ide_set_irq(drive, 1);
 778
 779         error = __ide_wait_stat(drive, drive->ready_stat,
 780                                 BUSY_STAT|DRQ_STAT|ERR_STAT,
 781                                 WAIT_CMD, &stat);
 782
 783         SELECT_MASK(drive, 0);
 784
 785         enable_irq(hwif->irq);
 786
 787         if (error) {
 788                 (void) ide_dump_status(drive, "set_drive_speed_status", stat);
 789                 return error;
 790         }
 791
 792         drive->id->dma_ultra &= ~0xFF00;
 793         drive->id->dma_mword &= ~0x0F00;
 794         drive->id->dma_1word &= ~0x0F00;
 795
 796  skip:
 797 #ifdef CONFIG_BLK_DEV_IDEDMA
 798         if ((speed >= XFER_SW_DMA_0 || (hwif->host_flags & IDE_HFLAG_VDMA)) &&
 799             drive->using_dma)
 800                 hwif->dma_host_set(drive, 1);
 801         else if (hwif->dma_host_set)    /* check if host supports DMA */
 802                 ide_dma_off_quietly(drive);
 803 #endif
 804
 805         switch(speed) {
 806                 case XFER_UDMA_7:   drive->id->dma_ultra |= 0x8080; break;
 807                 case XFER_UDMA_6:   drive->id->dma_ultra |= 0x4040; break;
 808                 case XFER_UDMA_5:   drive->id->dma_ultra |= 0x2020; break;
 809                 case XFER_UDMA_4:   drive->id->dma_ultra |= 0x1010; break;
 810                 case XFER_UDMA_3:   drive->id->dma_ultra |= 0x0808; break;
 811                 case XFER_UDMA_2:   drive->id->dma_ultra |= 0x0404; break;
 812                 case XFER_UDMA_1:   drive->id->dma_ultra |= 0x0202; break;
 813                 case XFER_UDMA_0:   drive->id->dma_ultra |= 0x0101; break;
 814                 case XFER_MW_DMA_2: drive->id->dma_mword |= 0x0404; break;
 815                 case XFER_MW_DMA_1: drive->id->dma_mword |= 0x0202; break;
 816                 case XFER_MW_DMA_0: drive->id->dma_mword |= 0x0101; break;
 817                 case XFER_SW_DMA_2: drive->id->dma_1word |= 0x0404; break;
 818                 case XFER_SW_DMA_1: drive->id->dma_1word |= 0x0202; break;
 819                 case XFER_SW_DMA_0: drive->id->dma_1word |= 0x0101; break;
 820                 default: break;
 821         }
 822         if (!drive->init_speed)
 823                 drive->init_speed = speed;
 824         drive->current_speed = speed;
 825         return error;
 826 }
 827
 828 /*
 829  * This should get invoked any time we exit the driver to
 830  * wait for an interrupt response from a drive.  handler() points
 831  * at the appropriate code to handle the next interrupt, and a
 832  * timer is started to prevent us from waiting forever in case
 833  * something goes wrong (see the ide_timer_expiry() handler later on).
 834  *
 835  * See also ide_execute_command
 836  */
 837 static void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 838                       unsigned int timeout, ide_expiry_t *expiry)
 839 {
 840         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 841
 842         if (hwgroup->handler != NULL) {
 843                 printk(KERN_CRIT "%s: ide_set_handler: handler not null; "
 844                         "old=%p, new=%p\n",
 845                         drive->name, hwgroup->handler, handler);
 846         }
 847         hwgroup->handler        = handler;
 848         hwgroup->expiry         = expiry;
 849         hwgroup->timer.expires  = jiffies + timeout;
 850         hwgroup->req_gen_timer = hwgroup->req_gen;
 851         add_timer(&hwgroup->timer);
 852 }
 853
 854 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 855                       unsigned int timeout, ide_expiry_t *expiry)
 856 {
 857         unsigned long flags;
 858         spin_lock_irqsave(&ide_lock, flags);
 859         __ide_set_handler(drive, handler, timeout, expiry);
 860         spin_unlock_irqrestore(&ide_lock, flags);
 861 }
 862
 863 EXPORT_SYMBOL(ide_set_handler);
 864
 865 /**
 866  *      ide_execute_command     -       execute an IDE command
 867  *      @drive: IDE drive to issue the command against
 868  *      @command: command byte to write
 869  *      @handler: handler for next phase
 870  *      @timeout: timeout for command
 871  *      @expiry:  handler to run on timeout
 872  *
 873  *      Helper function to issue an IDE command. This handles the
 874  *      atomicity requirements, command timing and ensures that the
 875  *      handler and IRQ setup do not race. All IDE command kick off
 876  *      should go via this function or do equivalent locking.
 877  */
 878
 879 void ide_execute_command(ide_drive_t *drive, u8 cmd, ide_handler_t *handler,
 880                          unsigned timeout, ide_expiry_t *expiry)
 881 {
 882         unsigned long flags;
 883         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 884         ide_hwif_t *hwif = HWIF(drive);
 885
 886         spin_lock_irqsave(&ide_lock, flags);
 887
 888         BUG_ON(hwgroup->handler);
 889         hwgroup->handler        = handler;
 890         hwgroup->expiry         = expiry;
 891         hwgroup->timer.expires  = jiffies + timeout;
 892         hwgroup->req_gen_timer = hwgroup->req_gen;
 893         add_timer(&hwgroup->timer);
 894         hwif->OUTBSYNC(drive, cmd, IDE_COMMAND_REG);
 895         /* Drive takes 400nS to respond, we must avoid the IRQ being
 896            serviced before that.
 897
 898            FIXME: we could skip this delay with care on non shared
 899            devices
 900         */
 901         ndelay(400);
 902         spin_unlock_irqrestore(&ide_lock, flags);
 903 }
 904
 905 EXPORT_SYMBOL(ide_execute_command);
 906
 907
 908 /* needed below */
 909 static ide_startstop_t do_reset1 (ide_drive_t *, int);
 910
 911 /*
 912  * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 913  * during an atapi drive reset operation. If the drive has not yet responded,
 914  * and we have not yet hit our maximum waiting time, then the timer is restarted
 915  * for another 50ms.
 916  */
 917 static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
 918 {
 919         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
 920         ide_hwif_t *hwif        = HWIF(drive);
 921         u8 stat;
 922
 923         SELECT_DRIVE(drive);
 924         udelay (10);
 925
 926         if (OK_STAT(stat = hwif->INB(IDE_STATUS_REG), 0, BUSY_STAT)) {
 927                 printk("%s: ATAPI reset complete\n", drive->name);
 928         } else {
 929                 if (time_before(jiffies, hwgroup->poll_timeout)) {
 930                         BUG_ON(HWGROUP(drive)->handler != NULL);
 931                         ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
 932                         /* continue polling */
 933                         return ide_started;
 934                 }
 935                 /* end of polling */
 936                 hwgroup->polling = 0;
 937                 printk("%s: ATAPI reset timed-out, status=0x%02x\n",
 938                                 drive->name, stat);
 939                 /* do it the old fashioned way */
 940                 return do_reset1(drive, 1);
 941         }
 942         /* done polling */
 943         hwgroup->polling = 0;
 944         hwgroup->resetting = 0;
 945         return ide_stopped;
 946 }
 947
 948 /*
 949  * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 950  * during an ide reset operation. If the drives have not yet responded,
 951  * and we have not yet hit our maximum waiting time, then the timer is restarted
 952  * for another 50ms.
 953  */
 954 static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
 955 {
 956         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
 957         ide_hwif_t *hwif        = HWIF(drive);
 958         u8 tmp;
 959
 960         if (hwif->reset_poll != NULL) {
 961                 if (hwif->reset_poll(drive)) {
 962                         printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
 963                                 hwif->name, drive->name);
 964                         return ide_stopped;
 965                 }
 966         }
 967
 968         if (!OK_STAT(tmp = hwif->INB(IDE_STATUS_REG), 0, BUSY_STAT)) {
 969                 if (time_before(jiffies, hwgroup->poll_timeout)) {
 970                         BUG_ON(HWGROUP(drive)->handler != NULL);
 971                         ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
 972                         /* continue polling */
 973                         return ide_started;
 974                 }
 975                 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
 976                 drive->failures++;
 977         } else  {
 978                 printk("%s: reset: ", hwif->name);
 979                 if ((tmp = hwif->INB(IDE_ERROR_REG)) == 1) {
 980                         printk("success\n");
 981                         drive->failures = 0;
 982                 } else {
 983                         drive->failures++;
 984                         printk("master: ");
 985                         switch (tmp & 0x7f) {
 986                                 case 1: printk("passed");
 987                                         break;
 988                                 case 2: printk("formatter device error");
 989                                         break;
 990                                 case 3: printk("sector buffer error");
 991                                         break;
 992                                 case 4: printk("ECC circuitry error");
 993                                         break;
 994                                 case 5: printk("controlling MPU error");
 995                                         break;
 996                                 default:printk("error (0x%02x?)", tmp);
 997                         }
 998                         if (tmp & 0x80)
 999                                 printk("; slave: failed");
1000                         printk("\n");
1001                 }
1002         }
1003         hwgroup->polling = 0;   /* done polling */
1004         hwgroup->resetting = 0; /* done reset attempt */
1005         return ide_stopped;
1006 }
1007
1008 static void check_dma_crc(ide_drive_t *drive)
1009 {
1010 #ifdef CONFIG_BLK_DEV_IDEDMA
1011         if (drive->crc_count) {
1012                 ide_dma_off_quietly(drive);
1013                 ide_set_xfer_rate(drive, ide_auto_reduce_xfer(drive));
1014                 if (drive->current_speed >= XFER_SW_DMA_0)
1015                         ide_dma_on(drive);
1016         } else
1017                 ide_dma_off(drive);
1018 #endif
1019 }
1020
1021 static void ide_disk_pre_reset(ide_drive_t *drive)
1022 {
1023         int legacy = (drive->id->cfs_enable_2 & 0x0400) ? 0 : 1;
1024
1025         drive->special.all = 0;
1026         drive->special.b.set_geometry = legacy;
1027         drive->special.b.recalibrate  = legacy;
1028         drive->mult_count = 0;
1029         if (!drive->keep_settings && !drive->using_dma)
1030                 drive->mult_req = 0;
1031         if (drive->mult_req != drive->mult_count)
1032                 drive->special.b.set_multmode = 1;
1033 }
1034
1035 static void pre_reset(ide_drive_t *drive)
1036 {
1037         if (drive->media == ide_disk)
1038                 ide_disk_pre_reset(drive);
1039         else
1040                 drive->post_reset = 1;
1041
1042         if (!drive->keep_settings) {
1043                 if (drive->using_dma) {
1044                         check_dma_crc(drive);
1045                 } else {
1046                         drive->unmask = 0;
1047                         drive->io_32bit = 0;
1048                 }
1049                 return;
1050         }
1051         if (drive->using_dma)
1052                 check_dma_crc(drive);
1053
1054         if (HWIF(drive)->pre_reset != NULL)
1055                 HWIF(drive)->pre_reset(drive);
1056
1057         if (drive->current_speed != 0xff)
1058                 drive->desired_speed = drive->current_speed;
1059         drive->current_speed = 0xff;
1060 }
1061
1062 /*
1063  * do_reset1() attempts to recover a confused drive by resetting it.
1064  * Unfortunately, resetting a disk drive actually resets all devices on
1065  * the same interface, so it can really be thought of as resetting the
1066  * interface rather than resetting the drive.
1067  *
1068  * ATAPI devices have their own reset mechanism which allows them to be
1069  * individually reset without clobbering other devices on the same interface.
1070  *
1071  * Unfortunately, the IDE interface does not generate an interrupt to let
1072  * us know when the reset operation has finished, so we must poll for this.
1073  * Equally poor, though, is the fact that this may a very long time to complete,
1074  * (up to 30 seconds worstcase).  So, instead of busy-waiting here for it,
1075  * we set a timer to poll at 50ms intervals.
1076  */
1077 static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
1078 {
1079         unsigned int unit;
1080         unsigned long flags;
1081         ide_hwif_t *hwif;
1082         ide_hwgroup_t *hwgroup;
1083
1084         spin_lock_irqsave(&ide_lock, flags);
1085         hwif = HWIF(drive);
1086         hwgroup = HWGROUP(drive);
1087
1088         /* We must not reset with running handlers */
1089         BUG_ON(hwgroup->handler != NULL);
1090
1091         /* For an ATAPI device, first try an ATAPI SRST. */
1092         if (drive->media != ide_disk && !do_not_try_atapi) {
1093                 hwgroup->resetting = 1;
1094                 pre_reset(drive);
1095                 SELECT_DRIVE(drive);
1096                 udelay (20);
1097                 hwif->OUTBSYNC(drive, WIN_SRST, IDE_COMMAND_REG);
1098                 ndelay(400);
1099                 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1100                 hwgroup->polling = 1;
1101                 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1102                 spin_unlock_irqrestore(&ide_lock, flags);
1103                 return ide_started;
1104         }
1105
1106         /*
1107          * First, reset any device state data we were maintaining
1108          * for any of the drives on this interface.
1109          */
1110         for (unit = 0; unit < MAX_DRIVES; ++unit)
1111                 pre_reset(&hwif->drives[unit]);
1112
1113         if (!IDE_CONTROL_REG) {
1114                 spin_unlock_irqrestore(&ide_lock, flags);
1115                 return ide_stopped;
1116         }
1117
1118         hwgroup->resetting = 1;
1119         /*
1120          * Note that we also set nIEN while resetting the device,
1121          * to mask unwanted interrupts from the interface during the reset.
1122          * However, due to the design of PC hardware, this will cause an
1123          * immediate interrupt due to the edge transition it produces.
1124          * This single interrupt gives us a "fast poll" for drives that
1125          * recover from reset very quickly, saving us the first 50ms wait time.
1126          */
1127         /* set SRST and nIEN */
1128         hwif->OUTBSYNC(drive, drive->ctl|6,IDE_CONTROL_REG);
1129         /* more than enough time */
1130         udelay(10);
1131         if (drive->quirk_list == 2) {
1132                 /* clear SRST and nIEN */
1133                 hwif->OUTBSYNC(drive, drive->ctl, IDE_CONTROL_REG);
1134         } else {
1135                 /* clear SRST, leave nIEN */
1136                 hwif->OUTBSYNC(drive, drive->ctl|2, IDE_CONTROL_REG);
1137         }
1138         /* more than enough time */
1139         udelay(10);
1140         hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1141         hwgroup->polling = 1;
1142         __ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1143
1144         /*
1145          * Some weird controller like resetting themselves to a strange
1146          * state when the disks are reset this way. At least, the Winbond
1147          * 553 documentation says that
1148          */
1149         if (hwif->resetproc)
1150                 hwif->resetproc(drive);
1151
1152         spin_unlock_irqrestore(&ide_lock, flags);
1153         return ide_started;
1154 }
1155
1156 /*
1157  * ide_do_reset() is the entry point to the drive/interface reset code.
1158  */
1159
1160 ide_startstop_t ide_do_reset (ide_drive_t *drive)
1161 {
1162         return do_reset1(drive, 0);
1163 }
1164
1165 EXPORT_SYMBOL(ide_do_reset);
1166
1167 /*
1168  * ide_wait_not_busy() waits for the currently selected device on the hwif
1169  * to report a non-busy status, see comments in probe_hwif().
1170  */
1171 int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
1172 {
1173         u8 stat = 0;
1174
1175         while(timeout--) {
1176                 /*
1177                  * Turn this into a schedule() sleep once I'm sure
1178                  * about locking issues (2.5 work ?).
1179                  */
1180                 mdelay(1);
1181                 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
1182                 if ((stat & BUSY_STAT) == 0)
1183                         return 0;
1184                 /*
1185                  * Assume a value of 0xff means nothing is connected to
1186                  * the interface and it doesn't implement the pull-down
1187                  * resistor on D7.
1188                  */
1189                 if (stat == 0xff)
1190                         return -ENODEV;
1191                 touch_softlockup_watchdog();
1192                 touch_nmi_watchdog();
1193         }
1194         return -EBUSY;
1195 }
1196
1197 EXPORT_SYMBOL_GPL(ide_wait_not_busy);
1198