drivers/ide/ide-iops.c

   1 /*
   2  * linux/drivers/ide/ide-iops.c Version 0.37    Mar 05, 2003
   3  *
   4  *  Copyright (C) 2000-2002     Andre Hedrick <andre@linux-ide.org>
   5  *  Copyright (C) 2003          Red Hat <alan@redhat.com>
   6  *
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/types.h>
  11 #include <linux/string.h>
  12 #include <linux/kernel.h>
  13 #include <linux/timer.h>
  14 #include <linux/mm.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/major.h>
  17 #include <linux/errno.h>
  18 #include <linux/genhd.h>
  19 #include <linux/blkpg.h>
  20 #include <linux/slab.h>
  21 #include <linux/pci.h>
  22 #include <linux/delay.h>
  23 #include <linux/hdreg.h>
  24 #include <linux/ide.h>
  25 #include <linux/bitops.h>
  26 #include <linux/nmi.h>
  27
  28 #include <asm/byteorder.h>
  29 #include <asm/irq.h>
  30 #include <asm/uaccess.h>
  31 #include <asm/io.h>
  32
  33 /*
  34  *      Conventional PIO operations for ATA devices
  35  */
  36
  37 static u8 ide_inb (unsigned long port)
  38 {
  39         return (u8) inb(port);
  40 }
  41
  42 static u16 ide_inw (unsigned long port)
  43 {
  44         return (u16) inw(port);
  45 }
  46
  47 static void ide_insw (unsigned long port, void *addr, u32 count)
  48 {
  49         insw(port, addr, count);
  50 }
  51
  52 static void ide_insl (unsigned long port, void *addr, u32 count)
  53 {
  54         insl(port, addr, count);
  55 }
  56
  57 static void ide_outb (u8 val, unsigned long port)
  58 {
  59         outb(val, port);
  60 }
  61
  62 static void ide_outbsync (ide_drive_t *drive, u8 addr, unsigned long port)
  63 {
  64         outb(addr, port);
  65 }
  66
  67 static void ide_outw (u16 val, unsigned long port)
  68 {
  69         outw(val, port);
  70 }
  71
  72 static void ide_outsw (unsigned long port, void *addr, u32 count)
  73 {
  74         outsw(port, addr, count);
  75 }
  76
  77 static void ide_outsl (unsigned long port, void *addr, u32 count)
  78 {
  79         outsl(port, addr, count);
  80 }
  81
  82 void default_hwif_iops (ide_hwif_t *hwif)
  83 {
  84         hwif->OUTB      = ide_outb;
  85         hwif->OUTBSYNC  = ide_outbsync;
  86         hwif->OUTW      = ide_outw;
  87         hwif->OUTSW     = ide_outsw;
  88         hwif->OUTSL     = ide_outsl;
  89         hwif->INB       = ide_inb;
  90         hwif->INW       = ide_inw;
  91         hwif->INSW      = ide_insw;
  92         hwif->INSL      = ide_insl;
  93 }
  94
  95 /*
  96  *      MMIO operations, typically used for SATA controllers
  97  */
  98
  99 static u8 ide_mm_inb (unsigned long port)
 100 {
 101         return (u8) readb((void __iomem *) port);
 102 }
 103
 104 static u16 ide_mm_inw (unsigned long port)
 105 {
 106         return (u16) readw((void __iomem *) port);
 107 }
 108
 109 static void ide_mm_insw (unsigned long port, void *addr, u32 count)
 110 {
 111         __ide_mm_insw((void __iomem *) port, addr, count);
 112 }
 113
 114 static void ide_mm_insl (unsigned long port, void *addr, u32 count)
 115 {
 116         __ide_mm_insl((void __iomem *) port, addr, count);
 117 }
 118
 119 static void ide_mm_outb (u8 value, unsigned long port)
 120 {
 121         writeb(value, (void __iomem *) port);
 122 }
 123
 124 static void ide_mm_outbsync (ide_drive_t *drive, u8 value, unsigned long port)
 125 {
 126         writeb(value, (void __iomem *) port);
 127 }
 128
 129 static void ide_mm_outw (u16 value, unsigned long port)
 130 {
 131         writew(value, (void __iomem *) port);
 132 }
 133
 134 static void ide_mm_outsw (unsigned long port, void *addr, u32 count)
 135 {
 136         __ide_mm_outsw((void __iomem *) port, addr, count);
 137 }
 138
 139 static void ide_mm_outsl (unsigned long port, void *addr, u32 count)
 140 {
 141         __ide_mm_outsl((void __iomem *) port, addr, count);
 142 }
 143
 144 void default_hwif_mmiops (ide_hwif_t *hwif)
 145 {
 146         hwif->OUTB      = ide_mm_outb;
 147         /* Most systems will need to override OUTBSYNC, alas however
 148            this one is controller specific! */
 149         hwif->OUTBSYNC  = ide_mm_outbsync;
 150         hwif->OUTW      = ide_mm_outw;
 151         hwif->OUTSW     = ide_mm_outsw;
 152         hwif->OUTSL     = ide_mm_outsl;
 153         hwif->INB       = ide_mm_inb;
 154         hwif->INW       = ide_mm_inw;
 155         hwif->INSW      = ide_mm_insw;
 156         hwif->INSL      = ide_mm_insl;
 157 }
 158
 159 EXPORT_SYMBOL(default_hwif_mmiops);
 160
 161 u32 ide_read_24 (ide_drive_t *drive)
 162 {
 163         u8 sect = HWIF(drive)->INB(IDE_SECTOR_REG);
 164         u8 lcyl = HWIF(drive)->INB(IDE_LCYL_REG);
 165         u8 hcyl = HWIF(drive)->INB(IDE_HCYL_REG);
 166         return (hcyl<<16)|(lcyl<<8)|sect;
 167 }
 168
 169 void SELECT_DRIVE (ide_drive_t *drive)
 170 {
 171         if (HWIF(drive)->selectproc)
 172                 HWIF(drive)->selectproc(drive);
 173         HWIF(drive)->OUTB(drive->select.all, IDE_SELECT_REG);
 174 }
 175
 176 EXPORT_SYMBOL(SELECT_DRIVE);
 177
 178 void SELECT_MASK (ide_drive_t *drive, int mask)
 179 {
 180         if (HWIF(drive)->maskproc)
 181                 HWIF(drive)->maskproc(drive, mask);
 182 }
 183
 184 /*
 185  * Some localbus EIDE interfaces require a special access sequence
 186  * when using 32-bit I/O instructions to transfer data.  We call this
 187  * the "vlb_sync" sequence, which consists of three successive reads
 188  * of the sector count register location, with interrupts disabled
 189  * to ensure that the reads all happen together.
 190  */
 191 static void ata_vlb_sync(ide_drive_t *drive, unsigned long port)
 192 {
 193         (void) HWIF(drive)->INB(port);
 194         (void) HWIF(drive)->INB(port);
 195         (void) HWIF(drive)->INB(port);
 196 }
 197
 198 /*
 199  * This is used for most PIO data transfers *from* the IDE interface
 200  */
 201 static void ata_input_data(ide_drive_t *drive, void *buffer, u32 wcount)
 202 {
 203         ide_hwif_t *hwif        = HWIF(drive);
 204         u8 io_32bit             = drive->io_32bit;
 205
 206         if (io_32bit) {
 207                 if (io_32bit & 2) {
 208                         unsigned long flags;
 209                         local_irq_save(flags);
 210                         ata_vlb_sync(drive, IDE_NSECTOR_REG);
 211                         hwif->INSL(IDE_DATA_REG, buffer, wcount);
 212                         local_irq_restore(flags);
 213                 } else
 214                         hwif->INSL(IDE_DATA_REG, buffer, wcount);
 215         } else {
 216                 hwif->INSW(IDE_DATA_REG, buffer, wcount<<1);
 217         }
 218 }
 219
 220 /*
 221  * This is used for most PIO data transfers *to* the IDE interface
 222  */
 223 static void ata_output_data(ide_drive_t *drive, void *buffer, u32 wcount)
 224 {
 225         ide_hwif_t *hwif        = HWIF(drive);
 226         u8 io_32bit             = drive->io_32bit;
 227
 228         if (io_32bit) {
 229                 if (io_32bit & 2) {
 230                         unsigned long flags;
 231                         local_irq_save(flags);
 232                         ata_vlb_sync(drive, IDE_NSECTOR_REG);
 233                         hwif->OUTSL(IDE_DATA_REG, buffer, wcount);
 234                         local_irq_restore(flags);
 235                 } else
 236                         hwif->OUTSL(IDE_DATA_REG, buffer, wcount);
 237         } else {
 238                 hwif->OUTSW(IDE_DATA_REG, buffer, wcount<<1);
 239         }
 240 }
 241
 242 /*
 243  * The following routines are mainly used by the ATAPI drivers.
 244  *
 245  * These routines will round up any request for an odd number of bytes,
 246  * so if an odd bytecount is specified, be sure that there's at least one
 247  * extra byte allocated for the buffer.
 248  */
 249
 250 static void atapi_input_bytes(ide_drive_t *drive, void *buffer, u32 bytecount)
 251 {
 252         ide_hwif_t *hwif = HWIF(drive);
 253
 254         ++bytecount;
 255 #if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
 256         if (MACH_IS_ATARI || MACH_IS_Q40) {
 257                 /* Atari has a byte-swapped IDE interface */
 258                 insw_swapw(IDE_DATA_REG, buffer, bytecount / 2);
 259                 return;
 260         }
 261 #endif /* CONFIG_ATARI || CONFIG_Q40 */
 262         hwif->ata_input_data(drive, buffer, bytecount / 4);
 263         if ((bytecount & 0x03) >= 2)
 264                 hwif->INSW(IDE_DATA_REG, ((u8 *)buffer)+(bytecount & ~0x03), 1);
 265 }
 266
 267 static void atapi_output_bytes(ide_drive_t *drive, void *buffer, u32 bytecount)
 268 {
 269         ide_hwif_t *hwif = HWIF(drive);
 270
 271         ++bytecount;
 272 #if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
 273         if (MACH_IS_ATARI || MACH_IS_Q40) {
 274                 /* Atari has a byte-swapped IDE interface */
 275                 outsw_swapw(IDE_DATA_REG, buffer, bytecount / 2);
 276                 return;
 277         }
 278 #endif /* CONFIG_ATARI || CONFIG_Q40 */
 279         hwif->ata_output_data(drive, buffer, bytecount / 4);
 280         if ((bytecount & 0x03) >= 2)
 281                 hwif->OUTSW(IDE_DATA_REG, ((u8*)buffer)+(bytecount & ~0x03), 1);
 282 }
 283
 284 void default_hwif_transport(ide_hwif_t *hwif)
 285 {
 286         hwif->ata_input_data            = ata_input_data;
 287         hwif->ata_output_data           = ata_output_data;
 288         hwif->atapi_input_bytes         = atapi_input_bytes;
 289         hwif->atapi_output_bytes        = atapi_output_bytes;
 290 }
 291
 292 void ide_fix_driveid (struct hd_driveid *id)
 293 {
 294 #ifndef __LITTLE_ENDIAN
 295 # ifdef __BIG_ENDIAN
 296         int i;
 297         u16 *stringcast;
 298
 299         id->config         = __le16_to_cpu(id->config);
 300         id->cyls           = __le16_to_cpu(id->cyls);
 301         id->reserved2      = __le16_to_cpu(id->reserved2);
 302         id->heads          = __le16_to_cpu(id->heads);
 303         id->track_bytes    = __le16_to_cpu(id->track_bytes);
 304         id->sector_bytes   = __le16_to_cpu(id->sector_bytes);
 305         id->sectors        = __le16_to_cpu(id->sectors);
 306         id->vendor0        = __le16_to_cpu(id->vendor0);
 307         id->vendor1        = __le16_to_cpu(id->vendor1);
 308         id->vendor2        = __le16_to_cpu(id->vendor2);
 309         stringcast = (u16 *)&id->serial_no[0];
 310         for (i = 0; i < (20/2); i++)
 311                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 312         id->buf_type       = __le16_to_cpu(id->buf_type);
 313         id->buf_size       = __le16_to_cpu(id->buf_size);
 314         id->ecc_bytes      = __le16_to_cpu(id->ecc_bytes);
 315         stringcast = (u16 *)&id->fw_rev[0];
 316         for (i = 0; i < (8/2); i++)
 317                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 318         stringcast = (u16 *)&id->model[0];
 319         for (i = 0; i < (40/2); i++)
 320                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 321         id->dword_io       = __le16_to_cpu(id->dword_io);
 322         id->reserved50     = __le16_to_cpu(id->reserved50);
 323         id->field_valid    = __le16_to_cpu(id->field_valid);
 324         id->cur_cyls       = __le16_to_cpu(id->cur_cyls);
 325         id->cur_heads      = __le16_to_cpu(id->cur_heads);
 326         id->cur_sectors    = __le16_to_cpu(id->cur_sectors);
 327         id->cur_capacity0  = __le16_to_cpu(id->cur_capacity0);
 328         id->cur_capacity1  = __le16_to_cpu(id->cur_capacity1);
 329         id->lba_capacity   = __le32_to_cpu(id->lba_capacity);
 330         id->dma_1word      = __le16_to_cpu(id->dma_1word);
 331         id->dma_mword      = __le16_to_cpu(id->dma_mword);
 332         id->eide_pio_modes = __le16_to_cpu(id->eide_pio_modes);
 333         id->eide_dma_min   = __le16_to_cpu(id->eide_dma_min);
 334         id->eide_dma_time  = __le16_to_cpu(id->eide_dma_time);
 335         id->eide_pio       = __le16_to_cpu(id->eide_pio);
 336         id->eide_pio_iordy = __le16_to_cpu(id->eide_pio_iordy);
 337         for (i = 0; i < 2; ++i)
 338                 id->words69_70[i] = __le16_to_cpu(id->words69_70[i]);
 339         for (i = 0; i < 4; ++i)
 340                 id->words71_74[i] = __le16_to_cpu(id->words71_74[i]);
 341         id->queue_depth    = __le16_to_cpu(id->queue_depth);
 342         for (i = 0; i < 4; ++i)
 343                 id->words76_79[i] = __le16_to_cpu(id->words76_79[i]);
 344         id->major_rev_num  = __le16_to_cpu(id->major_rev_num);
 345         id->minor_rev_num  = __le16_to_cpu(id->minor_rev_num);
 346         id->command_set_1  = __le16_to_cpu(id->command_set_1);
 347         id->command_set_2  = __le16_to_cpu(id->command_set_2);
 348         id->cfsse          = __le16_to_cpu(id->cfsse);
 349         id->cfs_enable_1   = __le16_to_cpu(id->cfs_enable_1);
 350         id->cfs_enable_2   = __le16_to_cpu(id->cfs_enable_2);
 351         id->csf_default    = __le16_to_cpu(id->csf_default);
 352         id->dma_ultra      = __le16_to_cpu(id->dma_ultra);
 353         id->trseuc         = __le16_to_cpu(id->trseuc);
 354         id->trsEuc         = __le16_to_cpu(id->trsEuc);
 355         id->CurAPMvalues   = __le16_to_cpu(id->CurAPMvalues);
 356         id->mprc           = __le16_to_cpu(id->mprc);
 357         id->hw_config      = __le16_to_cpu(id->hw_config);
 358         id->acoustic       = __le16_to_cpu(id->acoustic);
 359         id->msrqs          = __le16_to_cpu(id->msrqs);
 360         id->sxfert         = __le16_to_cpu(id->sxfert);
 361         id->sal            = __le16_to_cpu(id->sal);
 362         id->spg            = __le32_to_cpu(id->spg);
 363         id->lba_capacity_2 = __le64_to_cpu(id->lba_capacity_2);
 364         for (i = 0; i < 22; i++)
 365                 id->words104_125[i]   = __le16_to_cpu(id->words104_125[i]);
 366         id->last_lun       = __le16_to_cpu(id->last_lun);
 367         id->word127        = __le16_to_cpu(id->word127);
 368         id->dlf            = __le16_to_cpu(id->dlf);
 369         id->csfo           = __le16_to_cpu(id->csfo);
 370         for (i = 0; i < 26; i++)
 371                 id->words130_155[i] = __le16_to_cpu(id->words130_155[i]);
 372         id->word156        = __le16_to_cpu(id->word156);
 373         for (i = 0; i < 3; i++)
 374                 id->words157_159[i] = __le16_to_cpu(id->words157_159[i]);
 375         id->cfa_power      = __le16_to_cpu(id->cfa_power);
 376         for (i = 0; i < 14; i++)
 377                 id->words161_175[i] = __le16_to_cpu(id->words161_175[i]);
 378         for (i = 0; i < 31; i++)
 379                 id->words176_205[i] = __le16_to_cpu(id->words176_205[i]);
 380         for (i = 0; i < 48; i++)
 381                 id->words206_254[i] = __le16_to_cpu(id->words206_254[i]);
 382         id->integrity_word  = __le16_to_cpu(id->integrity_word);
 383 # else
 384 #  error "Please fix <asm/byteorder.h>"
 385 # endif
 386 #endif
 387 }
 388
 389 /*
 390  * ide_fixstring() cleans up and (optionally) byte-swaps a text string,
 391  * removing leading/trailing blanks and compressing internal blanks.
 392  * It is primarily used to tidy up the model name/number fields as
 393  * returned by the WIN_[P]IDENTIFY commands.
 394  */
 395
 396 void ide_fixstring (u8 *s, const int bytecount, const int byteswap)
 397 {
 398         u8 *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
 399
 400         if (byteswap) {
 401                 /* convert from big-endian to host byte order */
 402                 for (p = end ; p != s;) {
 403                         unsigned short *pp = (unsigned short *) (p -= 2);
 404                         *pp = ntohs(*pp);
 405                 }
 406         }
 407         /* strip leading blanks */
 408         while (s != end && *s == ' ')
 409                 ++s;
 410         /* compress internal blanks and strip trailing blanks */
 411         while (s != end && *s) {
 412                 if (*s++ != ' ' || (s != end && *s && *s != ' '))
 413                         *p++ = *(s-1);
 414         }
 415         /* wipe out trailing garbage */
 416         while (p != end)
 417                 *p++ = '\0';
 418 }
 419
 420 EXPORT_SYMBOL(ide_fixstring);
 421
 422 /*
 423  * Needed for PCI irq sharing
 424  */
 425 int drive_is_ready (ide_drive_t *drive)
 426 {
 427         ide_hwif_t *hwif        = HWIF(drive);
 428         u8 stat                 = 0;
 429
 430         if (drive->waiting_for_dma)
 431                 return hwif->ide_dma_test_irq(drive);
 432
 433 #if 0
 434         /* need to guarantee 400ns since last command was issued */
 435         udelay(1);
 436 #endif
 437
 438         /*
 439          * We do a passive status test under shared PCI interrupts on
 440          * cards that truly share the ATA side interrupt, but may also share
 441          * an interrupt with another pci card/device.  We make no assumptions
 442          * about possible isa-pnp and pci-pnp issues yet.
 443          */
 444         if (IDE_CONTROL_REG)
 445                 stat = hwif->INB(IDE_ALTSTATUS_REG);
 446         else
 447                 /* Note: this may clear a pending IRQ!! */
 448                 stat = hwif->INB(IDE_STATUS_REG);
 449
 450         if (stat & BUSY_STAT)
 451                 /* drive busy:  definitely not interrupting */
 452                 return 0;
 453
 454         /* drive ready: *might* be interrupting */
 455         return 1;
 456 }
 457
 458 EXPORT_SYMBOL(drive_is_ready);
 459
 460 /*
 461  * This routine busy-waits for the drive status to be not "busy".
 462  * It then checks the status for all of the "good" bits and none
 463  * of the "bad" bits, and if all is okay it returns 0.  All other
 464  * cases return error -- caller may then invoke ide_error().
 465  *
 466  * This routine should get fixed to not hog the cpu during extra long waits..
 467  * That could be done by busy-waiting for the first jiffy or two, and then
 468  * setting a timer to wake up at half second intervals thereafter,
 469  * until timeout is achieved, before timing out.
 470  */
 471 static int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout, u8 *rstat)
 472 {
 473         ide_hwif_t *hwif = drive->hwif;
 474         unsigned long flags;
 475         int i;
 476         u8 stat;
 477
 478         udelay(1);      /* spec allows drive 400ns to assert "BUSY" */
 479         if ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 480                 local_irq_set(flags);
 481                 timeout += jiffies;
 482                 while ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 483                         if (time_after(jiffies, timeout)) {
 484                                 /*
 485                                  * One last read after the timeout in case
 486                                  * heavy interrupt load made us not make any
 487                                  * progress during the timeout..
 488                                  */
 489                                 stat = hwif->INB(IDE_STATUS_REG);
 490                                 if (!(stat & BUSY_STAT))
 491                                         break;
 492
 493                                 local_irq_restore(flags);
 494                                 *rstat = stat;
 495                                 return -EBUSY;
 496                         }
 497                 }
 498                 local_irq_restore(flags);
 499         }
 500         /*
 501          * Allow status to settle, then read it again.
 502          * A few rare drives vastly violate the 400ns spec here,
 503          * so we'll wait up to 10usec for a "good" status
 504          * rather than expensively fail things immediately.
 505          * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 506          */
 507         for (i = 0; i < 10; i++) {
 508                 udelay(1);
 509                 if (OK_STAT((stat = hwif->INB(IDE_STATUS_REG)), good, bad)) {
 510                         *rstat = stat;
 511                         return 0;
 512                 }
 513         }
 514         *rstat = stat;
 515         return -EFAULT;
 516 }
 517
 518 /*
 519  * In case of error returns error value after doing "*startstop = ide_error()".
 520  * The caller should return the updated value of "startstop" in this case,
 521  * "startstop" is unchanged when the function returns 0.
 522  */
 523 int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout)
 524 {
 525         int err;
 526         u8 stat;
 527
 528         /* bail early if we've exceeded max_failures */
 529         if (drive->max_failures && (drive->failures > drive->max_failures)) {
 530                 *startstop = ide_stopped;
 531                 return 1;
 532         }
 533
 534         err = __ide_wait_stat(drive, good, bad, timeout, &stat);
 535
 536         if (err) {
 537                 char *s = (err == -EBUSY) ? "status timeout" : "status error";
 538                 *startstop = ide_error(drive, s, stat);
 539         }
 540
 541         return err;
 542 }
 543
 544 EXPORT_SYMBOL(ide_wait_stat);
 545
 546 /**
 547  *      ide_in_drive_list       -       look for drive in black/white list
 548  *      @id: drive identifier
 549  *      @drive_table: list to inspect
 550  *
 551  *      Look for a drive in the blacklist and the whitelist tables
 552  *      Returns 1 if the drive is found in the table.
 553  */
 554
 555 int ide_in_drive_list(struct hd_driveid *id, const struct drive_list_entry *drive_table)
 556 {
 557         for ( ; drive_table->id_model; drive_table++)
 558                 if ((!strcmp(drive_table->id_model, id->model)) &&
 559                     (!drive_table->id_firmware ||
 560                      strstr(id->fw_rev, drive_table->id_firmware)))
 561                         return 1;
 562         return 0;
 563 }
 564
 565 EXPORT_SYMBOL_GPL(ide_in_drive_list);
 566
 567 /*
 568  * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid.
 569  * We list them here and depend on the device side cable detection for them.
 570  *
 571  * Some optical devices with the buggy firmwares have the same problem.
 572  */
 573 static const struct drive_list_entry ivb_list[] = {
 574         { "QUANTUM FIREBALLlct10 05"    , "A03.0900"    },
 575         { "TSSTcorp CDDVDW SH-S202J"    , "SB00"        },
 576         { "TSSTcorp CDDVDW SH-S202J"    , "SB01"        },
 577         { "TSSTcorp CDDVDW SH-S202N"    , "SB00"        },
 578         { "TSSTcorp CDDVDW SH-S202N"    , "SB01"        },
 579         { NULL                          , NULL          }
 580 };
 581
 582 /*
 583  *  All hosts that use the 80c ribbon must use!
 584  *  The name is derived from upper byte of word 93 and the 80c ribbon.
 585  */
 586 u8 eighty_ninty_three (ide_drive_t *drive)
 587 {
 588         ide_hwif_t *hwif = drive->hwif;
 589         struct hd_driveid *id = drive->id;
 590         int ivb = ide_in_drive_list(id, ivb_list);
 591
 592         if (hwif->cbl == ATA_CBL_PATA40_SHORT)
 593                 return 1;
 594
 595         if (ivb)
 596                 printk(KERN_DEBUG "%s: skipping word 93 validity check\n",
 597                                   drive->name);
 598
 599         if (ide_dev_is_sata(id) && !ivb)
 600                 return 1;
 601
 602         if (hwif->cbl != ATA_CBL_PATA80 && !ivb)
 603                 goto no_80w;
 604
 605         /*
 606          * FIXME:
 607          * - force bit13 (80c cable present) check also for !ivb devices
 608          *   (unless the slave device is pre-ATA3)
 609          */
 610         if ((id->hw_config & 0x4000) || (ivb && (id->hw_config & 0x2000)))
 611                 return 1;
 612
 613 no_80w:
 614         if (drive->udma33_warned == 1)
 615                 return 0;
 616
 617         printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, "
 618                             "limiting max speed to UDMA33\n",
 619                             drive->name,
 620                             hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host");
 621
 622         drive->udma33_warned = 1;
 623
 624         return 0;
 625 }
 626
 627 int ide_ata66_check (ide_drive_t *drive, ide_task_t *args)
 628 {
 629         if (args->tf.command == WIN_SETFEATURES &&
 630             args->tf.lbal > XFER_UDMA_2 &&
 631             args->tf.feature == SETFEATURES_XFER) {
 632                 if (eighty_ninty_three(drive) == 0) {
 633                         printk(KERN_WARNING "%s: UDMA speeds >UDMA33 cannot "
 634                                             "be set\n", drive->name);
 635                         return 1;
 636                 }
 637         }
 638
 639         return 0;
 640 }
 641
 642 /*
 643  * Backside of HDIO_DRIVE_CMD call of SETFEATURES_XFER.
 644  * 1 : Safe to update drive->id DMA registers.
 645  * 0 : OOPs not allowed.
 646  */
 647 int set_transfer (ide_drive_t *drive, ide_task_t *args)
 648 {
 649         if (args->tf.command == WIN_SETFEATURES &&
 650             args->tf.lbal >= XFER_SW_DMA_0 &&
 651             args->tf.feature == SETFEATURES_XFER &&
 652             (drive->id->dma_ultra ||
 653              drive->id->dma_mword ||
 654              drive->id->dma_1word))
 655                 return 1;
 656
 657         return 0;
 658 }
 659
 660 #ifdef CONFIG_BLK_DEV_IDEDMA
 661 static u8 ide_auto_reduce_xfer (ide_drive_t *drive)
 662 {
 663         if (!drive->crc_count)
 664                 return drive->current_speed;
 665         drive->crc_count = 0;
 666
 667         switch(drive->current_speed) {
 668                 case XFER_UDMA_7:       return XFER_UDMA_6;
 669                 case XFER_UDMA_6:       return XFER_UDMA_5;
 670                 case XFER_UDMA_5:       return XFER_UDMA_4;
 671                 case XFER_UDMA_4:       return XFER_UDMA_3;
 672                 case XFER_UDMA_3:       return XFER_UDMA_2;
 673                 case XFER_UDMA_2:       return XFER_UDMA_1;
 674                 case XFER_UDMA_1:       return XFER_UDMA_0;
 675                         /*
 676                          * OOPS we do not goto non Ultra DMA modes
 677                          * without iCRC's available we force
 678                          * the system to PIO and make the user
 679                          * invoke the ATA-1 ATA-2 DMA modes.
 680                          */
 681                 case XFER_UDMA_0:
 682                 default:                return XFER_PIO_4;
 683         }
 684 }
 685 #endif /* CONFIG_BLK_DEV_IDEDMA */
 686
 687 int ide_driveid_update(ide_drive_t *drive)
 688 {
 689         ide_hwif_t *hwif = drive->hwif;
 690         struct hd_driveid *id;
 691         unsigned long timeout, flags;
 692
 693         /*
 694          * Re-read drive->id for possible DMA mode
 695          * change (copied from ide-probe.c)
 696          */
 697
 698         SELECT_MASK(drive, 1);
 699         if (IDE_CONTROL_REG)
 700                 hwif->OUTB(drive->ctl,IDE_CONTROL_REG);
 701         msleep(50);
 702         hwif->OUTB(WIN_IDENTIFY, IDE_COMMAND_REG);
 703         timeout = jiffies + WAIT_WORSTCASE;
 704         do {
 705                 if (time_after(jiffies, timeout)) {
 706                         SELECT_MASK(drive, 0);
 707                         return 0;       /* drive timed-out */
 708                 }
 709                 msleep(50);     /* give drive a breather */
 710         } while (hwif->INB(IDE_ALTSTATUS_REG) & BUSY_STAT);
 711         msleep(50);     /* wait for IRQ and DRQ_STAT */
 712         if (!OK_STAT(hwif->INB(IDE_STATUS_REG),DRQ_STAT,BAD_R_STAT)) {
 713                 SELECT_MASK(drive, 0);
 714                 printk("%s: CHECK for good STATUS\n", drive->name);
 715                 return 0;
 716         }
 717         local_irq_save(flags);
 718         SELECT_MASK(drive, 0);
 719         id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
 720         if (!id) {
 721                 local_irq_restore(flags);
 722                 return 0;
 723         }
 724         ata_input_data(drive, id, SECTOR_WORDS);
 725         (void) hwif->INB(IDE_STATUS_REG);       /* clear drive IRQ */
 726         local_irq_enable();
 727         local_irq_restore(flags);
 728         ide_fix_driveid(id);
 729         if (id) {
 730                 drive->id->dma_ultra = id->dma_ultra;
 731                 drive->id->dma_mword = id->dma_mword;
 732                 drive->id->dma_1word = id->dma_1word;
 733                 /* anything more ? */
 734                 kfree(id);
 735
 736                 if (drive->using_dma && ide_id_dma_bug(drive))
 737                         ide_dma_off(drive);
 738         }
 739
 740         return 1;
 741 }
 742
 743 int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
 744 {
 745         ide_hwif_t *hwif = drive->hwif;
 746         int error = 0;
 747         u8 stat;
 748
 749 //      while (HWGROUP(drive)->busy)
 750 //              msleep(50);
 751
 752 #ifdef CONFIG_BLK_DEV_IDEDMA
 753         if (hwif->ide_dma_on)   /* check if host supports DMA */
 754                 hwif->dma_host_off(drive);
 755 #endif
 756
 757         /* Skip setting PIO flow-control modes on pre-EIDE drives */
 758         if ((speed & 0xf8) == XFER_PIO_0 && !(drive->id->capability & 0x08))
 759                 goto skip;
 760
 761         /*
 762          * Don't use ide_wait_cmd here - it will
 763          * attempt to set_geometry and recalibrate,
 764          * but for some reason these don't work at
 765          * this point (lost interrupt).
 766          */
 767         /*
 768          * Select the drive, and issue the SETFEATURES command
 769          */
 770         disable_irq_nosync(hwif->irq);
 771
 772         /*
 773          *      FIXME: we race against the running IRQ here if
 774          *      this is called from non IRQ context. If we use
 775          *      disable_irq() we hang on the error path. Work
 776          *      is needed.
 777          */
 778
 779         udelay(1);
 780         SELECT_DRIVE(drive);
 781         SELECT_MASK(drive, 0);
 782         udelay(1);
 783         if (IDE_CONTROL_REG)
 784                 hwif->OUTB(drive->ctl | 2, IDE_CONTROL_REG);
 785         hwif->OUTB(speed, IDE_NSECTOR_REG);
 786         hwif->OUTB(SETFEATURES_XFER, IDE_FEATURE_REG);
 787         hwif->OUTBSYNC(drive, WIN_SETFEATURES, IDE_COMMAND_REG);
 788         if ((IDE_CONTROL_REG) && (drive->quirk_list == 2))
 789                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
 790
 791         error = __ide_wait_stat(drive, drive->ready_stat,
 792                                 BUSY_STAT|DRQ_STAT|ERR_STAT,
 793                                 WAIT_CMD, &stat);
 794
 795         SELECT_MASK(drive, 0);
 796
 797         enable_irq(hwif->irq);
 798
 799         if (error) {
 800                 (void) ide_dump_status(drive, "set_drive_speed_status", stat);
 801                 return error;
 802         }
 803
 804         drive->id->dma_ultra &= ~0xFF00;
 805         drive->id->dma_mword &= ~0x0F00;
 806         drive->id->dma_1word &= ~0x0F00;
 807
 808  skip:
 809 #ifdef CONFIG_BLK_DEV_IDEDMA
 810         if (speed >= XFER_SW_DMA_0)
 811                 hwif->dma_host_on(drive);
 812         else if (hwif->ide_dma_on)      /* check if host supports DMA */
 813                 hwif->dma_off_quietly(drive);
 814 #endif
 815
 816         switch(speed) {
 817                 case XFER_UDMA_7:   drive->id->dma_ultra |= 0x8080; break;
 818                 case XFER_UDMA_6:   drive->id->dma_ultra |= 0x4040; break;
 819                 case XFER_UDMA_5:   drive->id->dma_ultra |= 0x2020; break;
 820                 case XFER_UDMA_4:   drive->id->dma_ultra |= 0x1010; break;
 821                 case XFER_UDMA_3:   drive->id->dma_ultra |= 0x0808; break;
 822                 case XFER_UDMA_2:   drive->id->dma_ultra |= 0x0404; break;
 823                 case XFER_UDMA_1:   drive->id->dma_ultra |= 0x0202; break;
 824                 case XFER_UDMA_0:   drive->id->dma_ultra |= 0x0101; break;
 825                 case XFER_MW_DMA_2: drive->id->dma_mword |= 0x0404; break;
 826                 case XFER_MW_DMA_1: drive->id->dma_mword |= 0x0202; break;
 827                 case XFER_MW_DMA_0: drive->id->dma_mword |= 0x0101; break;
 828                 case XFER_SW_DMA_2: drive->id->dma_1word |= 0x0404; break;
 829                 case XFER_SW_DMA_1: drive->id->dma_1word |= 0x0202; break;
 830                 case XFER_SW_DMA_0: drive->id->dma_1word |= 0x0101; break;
 831                 default: break;
 832         }
 833         if (!drive->init_speed)
 834                 drive->init_speed = speed;
 835         drive->current_speed = speed;
 836         return error;
 837 }
 838
 839 /*
 840  * This should get invoked any time we exit the driver to
 841  * wait for an interrupt response from a drive.  handler() points
 842  * at the appropriate code to handle the next interrupt, and a
 843  * timer is started to prevent us from waiting forever in case
 844  * something goes wrong (see the ide_timer_expiry() handler later on).
 845  *
 846  * See also ide_execute_command
 847  */
 848 static void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 849                       unsigned int timeout, ide_expiry_t *expiry)
 850 {
 851         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 852
 853         if (hwgroup->handler != NULL) {
 854                 printk(KERN_CRIT "%s: ide_set_handler: handler not null; "
 855                         "old=%p, new=%p\n",
 856                         drive->name, hwgroup->handler, handler);
 857         }
 858         hwgroup->handler        = handler;
 859         hwgroup->expiry         = expiry;
 860         hwgroup->timer.expires  = jiffies + timeout;
 861         hwgroup->req_gen_timer = hwgroup->req_gen;
 862         add_timer(&hwgroup->timer);
 863 }
 864
 865 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 866                       unsigned int timeout, ide_expiry_t *expiry)
 867 {
 868         unsigned long flags;
 869         spin_lock_irqsave(&ide_lock, flags);
 870         __ide_set_handler(drive, handler, timeout, expiry);
 871         spin_unlock_irqrestore(&ide_lock, flags);
 872 }
 873
 874 EXPORT_SYMBOL(ide_set_handler);
 875
 876 /**
 877  *      ide_execute_command     -       execute an IDE command
 878  *      @drive: IDE drive to issue the command against
 879  *      @command: command byte to write
 880  *      @handler: handler for next phase
 881  *      @timeout: timeout for command
 882  *      @expiry:  handler to run on timeout
 883  *
 884  *      Helper function to issue an IDE command. This handles the
 885  *      atomicity requirements, command timing and ensures that the
 886  *      handler and IRQ setup do not race. All IDE command kick off
 887  *      should go via this function or do equivalent locking.
 888  */
 889
 890 void ide_execute_command(ide_drive_t *drive, u8 cmd, ide_handler_t *handler,
 891                          unsigned timeout, ide_expiry_t *expiry)
 892 {
 893         unsigned long flags;
 894         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 895         ide_hwif_t *hwif = HWIF(drive);
 896
 897         spin_lock_irqsave(&ide_lock, flags);
 898
 899         BUG_ON(hwgroup->handler);
 900         hwgroup->handler        = handler;
 901         hwgroup->expiry         = expiry;
 902         hwgroup->timer.expires  = jiffies + timeout;
 903         hwgroup->req_gen_timer = hwgroup->req_gen;
 904         add_timer(&hwgroup->timer);
 905         hwif->OUTBSYNC(drive, cmd, IDE_COMMAND_REG);
 906         /* Drive takes 400nS to respond, we must avoid the IRQ being
 907            serviced before that.
 908
 909            FIXME: we could skip this delay with care on non shared
 910            devices
 911         */
 912         ndelay(400);
 913         spin_unlock_irqrestore(&ide_lock, flags);
 914 }
 915
 916 EXPORT_SYMBOL(ide_execute_command);
 917
 918
 919 /* needed below */
 920 static ide_startstop_t do_reset1 (ide_drive_t *, int);
 921
 922 /*
 923  * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 924  * during an atapi drive reset operation. If the drive has not yet responded,
 925  * and we have not yet hit our maximum waiting time, then the timer is restarted
 926  * for another 50ms.
 927  */
 928 static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
 929 {
 930         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
 931         ide_hwif_t *hwif        = HWIF(drive);
 932         u8 stat;
 933
 934         SELECT_DRIVE(drive);
 935         udelay (10);
 936
 937         if (OK_STAT(stat = hwif->INB(IDE_STATUS_REG), 0, BUSY_STAT)) {
 938                 printk("%s: ATAPI reset complete\n", drive->name);
 939         } else {
 940                 if (time_before(jiffies, hwgroup->poll_timeout)) {
 941                         BUG_ON(HWGROUP(drive)->handler != NULL);
 942                         ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
 943                         /* continue polling */
 944                         return ide_started;
 945                 }
 946                 /* end of polling */
 947                 hwgroup->polling = 0;
 948                 printk("%s: ATAPI reset timed-out, status=0x%02x\n",
 949                                 drive->name, stat);
 950                 /* do it the old fashioned way */
 951                 return do_reset1(drive, 1);
 952         }
 953         /* done polling */
 954         hwgroup->polling = 0;
 955         hwgroup->resetting = 0;
 956         return ide_stopped;
 957 }
 958
 959 /*
 960  * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 961  * during an ide reset operation. If the drives have not yet responded,
 962  * and we have not yet hit our maximum waiting time, then the timer is restarted
 963  * for another 50ms.
 964  */
 965 static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
 966 {
 967         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
 968         ide_hwif_t *hwif        = HWIF(drive);
 969         u8 tmp;
 970
 971         if (hwif->reset_poll != NULL) {
 972                 if (hwif->reset_poll(drive)) {
 973                         printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
 974                                 hwif->name, drive->name);
 975                         return ide_stopped;
 976                 }
 977         }
 978
 979         if (!OK_STAT(tmp = hwif->INB(IDE_STATUS_REG), 0, BUSY_STAT)) {
 980                 if (time_before(jiffies, hwgroup->poll_timeout)) {
 981                         BUG_ON(HWGROUP(drive)->handler != NULL);
 982                         ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
 983                         /* continue polling */
 984                         return ide_started;
 985                 }
 986                 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
 987                 drive->failures++;
 988         } else  {
 989                 printk("%s: reset: ", hwif->name);
 990                 if ((tmp = hwif->INB(IDE_ERROR_REG)) == 1) {
 991                         printk("success\n");
 992                         drive->failures = 0;
 993                 } else {
 994                         drive->failures++;
 995                         printk("master: ");
 996                         switch (tmp & 0x7f) {
 997                                 case 1: printk("passed");
 998                                         break;
 999                                 case 2: printk("formatter device error");
1000                                         break;
1001                                 case 3: printk("sector buffer error");
1002                                         break;
1003                                 case 4: printk("ECC circuitry error");
1004                                         break;
1005                                 case 5: printk("controlling MPU error");
1006                                         break;
1007                                 default:printk("error (0x%02x?)", tmp);
1008                         }
1009                         if (tmp & 0x80)
1010                                 printk("; slave: failed");
1011                         printk("\n");
1012                 }
1013         }
1014         hwgroup->polling = 0;   /* done polling */
1015         hwgroup->resetting = 0; /* done reset attempt */
1016         return ide_stopped;
1017 }
1018
1019 static void check_dma_crc(ide_drive_t *drive)
1020 {
1021 #ifdef CONFIG_BLK_DEV_IDEDMA
1022         if (drive->crc_count) {
1023                 drive->hwif->dma_off_quietly(drive);
1024                 ide_set_xfer_rate(drive, ide_auto_reduce_xfer(drive));
1025                 if (drive->current_speed >= XFER_SW_DMA_0)
1026                         (void) HWIF(drive)->ide_dma_on(drive);
1027         } else
1028                 ide_dma_off(drive);
1029 #endif
1030 }
1031
1032 static void ide_disk_pre_reset(ide_drive_t *drive)
1033 {
1034         int legacy = (drive->id->cfs_enable_2 & 0x0400) ? 0 : 1;
1035
1036         drive->special.all = 0;
1037         drive->special.b.set_geometry = legacy;
1038         drive->special.b.recalibrate  = legacy;
1039         drive->mult_count = 0;
1040         if (!drive->keep_settings && !drive->using_dma)
1041                 drive->mult_req = 0;
1042         if (drive->mult_req != drive->mult_count)
1043                 drive->special.b.set_multmode = 1;
1044 }
1045
1046 static void pre_reset(ide_drive_t *drive)
1047 {
1048         if (drive->media == ide_disk)
1049                 ide_disk_pre_reset(drive);
1050         else
1051                 drive->post_reset = 1;
1052
1053         if (!drive->keep_settings) {
1054                 if (drive->using_dma) {
1055                         check_dma_crc(drive);
1056                 } else {
1057                         drive->unmask = 0;
1058                         drive->io_32bit = 0;
1059                 }
1060                 return;
1061         }
1062         if (drive->using_dma)
1063                 check_dma_crc(drive);
1064
1065         if (HWIF(drive)->pre_reset != NULL)
1066                 HWIF(drive)->pre_reset(drive);
1067
1068         if (drive->current_speed != 0xff)
1069                 drive->desired_speed = drive->current_speed;
1070         drive->current_speed = 0xff;
1071 }
1072
1073 /*
1074  * do_reset1() attempts to recover a confused drive by resetting it.
1075  * Unfortunately, resetting a disk drive actually resets all devices on
1076  * the same interface, so it can really be thought of as resetting the
1077  * interface rather than resetting the drive.
1078  *
1079  * ATAPI devices have their own reset mechanism which allows them to be
1080  * individually reset without clobbering other devices on the same interface.
1081  *
1082  * Unfortunately, the IDE interface does not generate an interrupt to let
1083  * us know when the reset operation has finished, so we must poll for this.
1084  * Equally poor, though, is the fact that this may a very long time to complete,
1085  * (up to 30 seconds worstcase).  So, instead of busy-waiting here for it,
1086  * we set a timer to poll at 50ms intervals.
1087  */
1088 static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
1089 {
1090         unsigned int unit;
1091         unsigned long flags;
1092         ide_hwif_t *hwif;
1093         ide_hwgroup_t *hwgroup;
1094
1095         spin_lock_irqsave(&ide_lock, flags);
1096         hwif = HWIF(drive);
1097         hwgroup = HWGROUP(drive);
1098
1099         /* We must not reset with running handlers */
1100         BUG_ON(hwgroup->handler != NULL);
1101
1102         /* For an ATAPI device, first try an ATAPI SRST. */
1103         if (drive->media != ide_disk && !do_not_try_atapi) {
1104                 hwgroup->resetting = 1;
1105                 pre_reset(drive);
1106                 SELECT_DRIVE(drive);
1107                 udelay (20);
1108                 hwif->OUTBSYNC(drive, WIN_SRST, IDE_COMMAND_REG);
1109                 ndelay(400);
1110                 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1111                 hwgroup->polling = 1;
1112                 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1113                 spin_unlock_irqrestore(&ide_lock, flags);
1114                 return ide_started;
1115         }
1116
1117         /*
1118          * First, reset any device state data we were maintaining
1119          * for any of the drives on this interface.
1120          */
1121         for (unit = 0; unit < MAX_DRIVES; ++unit)
1122                 pre_reset(&hwif->drives[unit]);
1123
1124         if (!IDE_CONTROL_REG) {
1125                 spin_unlock_irqrestore(&ide_lock, flags);
1126                 return ide_stopped;
1127         }
1128
1129         hwgroup->resetting = 1;
1130         /*
1131          * Note that we also set nIEN while resetting the device,
1132          * to mask unwanted interrupts from the interface during the reset.
1133          * However, due to the design of PC hardware, this will cause an
1134          * immediate interrupt due to the edge transition it produces.
1135          * This single interrupt gives us a "fast poll" for drives that
1136          * recover from reset very quickly, saving us the first 50ms wait time.
1137          */
1138         /* set SRST and nIEN */
1139         hwif->OUTBSYNC(drive, drive->ctl|6,IDE_CONTROL_REG);
1140         /* more than enough time */
1141         udelay(10);
1142         if (drive->quirk_list == 2) {
1143                 /* clear SRST and nIEN */
1144                 hwif->OUTBSYNC(drive, drive->ctl, IDE_CONTROL_REG);
1145         } else {
1146                 /* clear SRST, leave nIEN */
1147                 hwif->OUTBSYNC(drive, drive->ctl|2, IDE_CONTROL_REG);
1148         }
1149         /* more than enough time */
1150         udelay(10);
1151         hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1152         hwgroup->polling = 1;
1153         __ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1154
1155         /*
1156          * Some weird controller like resetting themselves to a strange
1157          * state when the disks are reset this way. At least, the Winbond
1158          * 553 documentation says that
1159          */
1160         if (hwif->resetproc)
1161                 hwif->resetproc(drive);
1162
1163         spin_unlock_irqrestore(&ide_lock, flags);
1164         return ide_started;
1165 }
1166
1167 /*
1168  * ide_do_reset() is the entry point to the drive/interface reset code.
1169  */
1170
1171 ide_startstop_t ide_do_reset (ide_drive_t *drive)
1172 {
1173         return do_reset1(drive, 0);
1174 }
1175
1176 EXPORT_SYMBOL(ide_do_reset);
1177
1178 /*
1179  * ide_wait_not_busy() waits for the currently selected device on the hwif
1180  * to report a non-busy status, see comments in probe_hwif().
1181  */
1182 int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
1183 {
1184         u8 stat = 0;
1185
1186         while(timeout--) {
1187                 /*
1188                  * Turn this into a schedule() sleep once I'm sure
1189                  * about locking issues (2.5 work ?).
1190                  */
1191                 mdelay(1);
1192                 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
1193                 if ((stat & BUSY_STAT) == 0)
1194                         return 0;
1195                 /*
1196                  * Assume a value of 0xff means nothing is connected to
1197                  * the interface and it doesn't implement the pull-down
1198                  * resistor on D7.
1199                  */
1200                 if (stat == 0xff)
1201                         return -ENODEV;
1202                 touch_softlockup_watchdog();
1203                 touch_nmi_watchdog();
1204         }
1205         return -EBUSY;
1206 }
1207
1208 EXPORT_SYMBOL_GPL(ide_wait_not_busy);
1209