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/config.h>
  10 #include <linux/module.h>
  11 #include <linux/types.h>
  12 #include <linux/string.h>
  13 #include <linux/kernel.h>
  14 #include <linux/timer.h>
  15 #include <linux/mm.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/major.h>
  18 #include <linux/errno.h>
  19 #include <linux/genhd.h>
  20 #include <linux/blkpg.h>
  21 #include <linux/slab.h>
  22 #include <linux/pci.h>
  23 #include <linux/delay.h>
  24 #include <linux/hdreg.h>
  25 #include <linux/ide.h>
  26 #include <linux/bitops.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 u32 ide_inl (unsigned long port)
  53 {
  54         return (u32) inl(port);
  55 }
  56
  57 static void ide_insl (unsigned long port, void *addr, u32 count)
  58 {
  59         insl(port, addr, count);
  60 }
  61
  62 static void ide_outb (u8 val, unsigned long port)
  63 {
  64         outb(val, port);
  65 }
  66
  67 static void ide_outbsync (ide_drive_t *drive, u8 addr, unsigned long port)
  68 {
  69         outb(addr, port);
  70 }
  71
  72 static void ide_outw (u16 val, unsigned long port)
  73 {
  74         outw(val, port);
  75 }
  76
  77 static void ide_outsw (unsigned long port, void *addr, u32 count)
  78 {
  79         outsw(port, addr, count);
  80 }
  81
  82 static void ide_outl (u32 val, unsigned long port)
  83 {
  84         outl(val, port);
  85 }
  86
  87 static void ide_outsl (unsigned long port, void *addr, u32 count)
  88 {
  89         outsl(port, addr, count);
  90 }
  91
  92 void default_hwif_iops (ide_hwif_t *hwif)
  93 {
  94         hwif->OUTB      = ide_outb;
  95         hwif->OUTBSYNC  = ide_outbsync;
  96         hwif->OUTW      = ide_outw;
  97         hwif->OUTL      = ide_outl;
  98         hwif->OUTSW     = ide_outsw;
  99         hwif->OUTSL     = ide_outsl;
 100         hwif->INB       = ide_inb;
 101         hwif->INW       = ide_inw;
 102         hwif->INL       = ide_inl;
 103         hwif->INSW      = ide_insw;
 104         hwif->INSL      = ide_insl;
 105 }
 106
 107 EXPORT_SYMBOL(default_hwif_iops);
 108
 109 /*
 110  *      MMIO operations, typically used for SATA controllers
 111  */
 112
 113 static u8 ide_mm_inb (unsigned long port)
 114 {
 115         return (u8) readb((void __iomem *) port);
 116 }
 117
 118 static u16 ide_mm_inw (unsigned long port)
 119 {
 120         return (u16) readw((void __iomem *) port);
 121 }
 122
 123 static void ide_mm_insw (unsigned long port, void *addr, u32 count)
 124 {
 125         __ide_mm_insw((void __iomem *) port, addr, count);
 126 }
 127
 128 static u32 ide_mm_inl (unsigned long port)
 129 {
 130         return (u32) readl((void __iomem *) port);
 131 }
 132
 133 static void ide_mm_insl (unsigned long port, void *addr, u32 count)
 134 {
 135         __ide_mm_insl((void __iomem *) port, addr, count);
 136 }
 137
 138 static void ide_mm_outb (u8 value, unsigned long port)
 139 {
 140         writeb(value, (void __iomem *) port);
 141 }
 142
 143 static void ide_mm_outbsync (ide_drive_t *drive, u8 value, unsigned long port)
 144 {
 145         writeb(value, (void __iomem *) port);
 146 }
 147
 148 static void ide_mm_outw (u16 value, unsigned long port)
 149 {
 150         writew(value, (void __iomem *) port);
 151 }
 152
 153 static void ide_mm_outsw (unsigned long port, void *addr, u32 count)
 154 {
 155         __ide_mm_outsw((void __iomem *) port, addr, count);
 156 }
 157
 158 static void ide_mm_outl (u32 value, unsigned long port)
 159 {
 160         writel(value, (void __iomem *) port);
 161 }
 162
 163 static void ide_mm_outsl (unsigned long port, void *addr, u32 count)
 164 {
 165         __ide_mm_outsl((void __iomem *) port, addr, count);
 166 }
 167
 168 void default_hwif_mmiops (ide_hwif_t *hwif)
 169 {
 170         hwif->OUTB      = ide_mm_outb;
 171         /* Most systems will need to override OUTBSYNC, alas however
 172            this one is controller specific! */
 173         hwif->OUTBSYNC  = ide_mm_outbsync;
 174         hwif->OUTW      = ide_mm_outw;
 175         hwif->OUTL      = ide_mm_outl;
 176         hwif->OUTSW     = ide_mm_outsw;
 177         hwif->OUTSL     = ide_mm_outsl;
 178         hwif->INB       = ide_mm_inb;
 179         hwif->INW       = ide_mm_inw;
 180         hwif->INL       = ide_mm_inl;
 181         hwif->INSW      = ide_mm_insw;
 182         hwif->INSL      = ide_mm_insl;
 183 }
 184
 185 EXPORT_SYMBOL(default_hwif_mmiops);
 186
 187 void default_hwif_transport (ide_hwif_t *hwif)
 188 {
 189         hwif->ata_input_data            = ata_input_data;
 190         hwif->ata_output_data           = ata_output_data;
 191         hwif->atapi_input_bytes         = atapi_input_bytes;
 192         hwif->atapi_output_bytes        = atapi_output_bytes;
 193 }
 194
 195 EXPORT_SYMBOL(default_hwif_transport);
 196
 197 u32 ide_read_24 (ide_drive_t *drive)
 198 {
 199         u8 hcyl = HWIF(drive)->INB(IDE_HCYL_REG);
 200         u8 lcyl = HWIF(drive)->INB(IDE_LCYL_REG);
 201         u8 sect = HWIF(drive)->INB(IDE_SECTOR_REG);
 202         return (hcyl<<16)|(lcyl<<8)|sect;
 203 }
 204
 205 EXPORT_SYMBOL(ide_read_24);
 206
 207 void SELECT_DRIVE (ide_drive_t *drive)
 208 {
 209         if (HWIF(drive)->selectproc)
 210                 HWIF(drive)->selectproc(drive);
 211         HWIF(drive)->OUTB(drive->select.all, IDE_SELECT_REG);
 212 }
 213
 214 EXPORT_SYMBOL(SELECT_DRIVE);
 215
 216 void SELECT_INTERRUPT (ide_drive_t *drive)
 217 {
 218         if (HWIF(drive)->intrproc)
 219                 HWIF(drive)->intrproc(drive);
 220         else
 221                 HWIF(drive)->OUTB(drive->ctl|2, IDE_CONTROL_REG);
 222 }
 223
 224 void SELECT_MASK (ide_drive_t *drive, int mask)
 225 {
 226         if (HWIF(drive)->maskproc)
 227                 HWIF(drive)->maskproc(drive, mask);
 228 }
 229
 230 void QUIRK_LIST (ide_drive_t *drive)
 231 {
 232         if (HWIF(drive)->quirkproc)
 233                 drive->quirk_list = HWIF(drive)->quirkproc(drive);
 234 }
 235
 236 /*
 237  * Some localbus EIDE interfaces require a special access sequence
 238  * when using 32-bit I/O instructions to transfer data.  We call this
 239  * the "vlb_sync" sequence, which consists of three successive reads
 240  * of the sector count register location, with interrupts disabled
 241  * to ensure that the reads all happen together.
 242  */
 243 void ata_vlb_sync (ide_drive_t *drive, unsigned long port)
 244 {
 245         (void) HWIF(drive)->INB(port);
 246         (void) HWIF(drive)->INB(port);
 247         (void) HWIF(drive)->INB(port);
 248 }
 249
 250 /*
 251  * This is used for most PIO data transfers *from* the IDE interface
 252  */
 253 void ata_input_data (ide_drive_t *drive, void *buffer, u32 wcount)
 254 {
 255         ide_hwif_t *hwif        = HWIF(drive);
 256         u8 io_32bit             = drive->io_32bit;
 257
 258         if (io_32bit) {
 259                 if (io_32bit & 2) {
 260                         unsigned long flags;
 261                         local_irq_save(flags);
 262                         ata_vlb_sync(drive, IDE_NSECTOR_REG);
 263                         hwif->INSL(IDE_DATA_REG, buffer, wcount);
 264                         local_irq_restore(flags);
 265                 } else
 266                         hwif->INSL(IDE_DATA_REG, buffer, wcount);
 267         } else {
 268                 hwif->INSW(IDE_DATA_REG, buffer, wcount<<1);
 269         }
 270 }
 271
 272 /*
 273  * This is used for most PIO data transfers *to* the IDE interface
 274  */
 275 void ata_output_data (ide_drive_t *drive, void *buffer, u32 wcount)
 276 {
 277         ide_hwif_t *hwif        = HWIF(drive);
 278         u8 io_32bit             = drive->io_32bit;
 279
 280         if (io_32bit) {
 281                 if (io_32bit & 2) {
 282                         unsigned long flags;
 283                         local_irq_save(flags);
 284                         ata_vlb_sync(drive, IDE_NSECTOR_REG);
 285                         hwif->OUTSL(IDE_DATA_REG, buffer, wcount);
 286                         local_irq_restore(flags);
 287                 } else
 288                         hwif->OUTSL(IDE_DATA_REG, buffer, wcount);
 289         } else {
 290                 hwif->OUTSW(IDE_DATA_REG, buffer, wcount<<1);
 291         }
 292 }
 293
 294 /*
 295  * The following routines are mainly used by the ATAPI drivers.
 296  *
 297  * These routines will round up any request for an odd number of bytes,
 298  * so if an odd bytecount is specified, be sure that there's at least one
 299  * extra byte allocated for the buffer.
 300  */
 301
 302 void atapi_input_bytes (ide_drive_t *drive, void *buffer, u32 bytecount)
 303 {
 304         ide_hwif_t *hwif = HWIF(drive);
 305
 306         ++bytecount;
 307 #if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
 308         if (MACH_IS_ATARI || MACH_IS_Q40) {
 309                 /* Atari has a byte-swapped IDE interface */
 310                 insw_swapw(IDE_DATA_REG, buffer, bytecount / 2);
 311                 return;
 312         }
 313 #endif /* CONFIG_ATARI || CONFIG_Q40 */
 314         hwif->ata_input_data(drive, buffer, bytecount / 4);
 315         if ((bytecount & 0x03) >= 2)
 316                 hwif->INSW(IDE_DATA_REG, ((u8 *)buffer)+(bytecount & ~0x03), 1);
 317 }
 318
 319 EXPORT_SYMBOL(atapi_input_bytes);
 320
 321 void atapi_output_bytes (ide_drive_t *drive, void *buffer, u32 bytecount)
 322 {
 323         ide_hwif_t *hwif = HWIF(drive);
 324
 325         ++bytecount;
 326 #if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
 327         if (MACH_IS_ATARI || MACH_IS_Q40) {
 328                 /* Atari has a byte-swapped IDE interface */
 329                 outsw_swapw(IDE_DATA_REG, buffer, bytecount / 2);
 330                 return;
 331         }
 332 #endif /* CONFIG_ATARI || CONFIG_Q40 */
 333         hwif->ata_output_data(drive, buffer, bytecount / 4);
 334         if ((bytecount & 0x03) >= 2)
 335                 hwif->OUTSW(IDE_DATA_REG, ((u8*)buffer)+(bytecount & ~0x03), 1);
 336 }
 337
 338 EXPORT_SYMBOL(atapi_output_bytes);
 339
 340 /*
 341  * Beginning of Taskfile OPCODE Library and feature sets.
 342  */
 343 void ide_fix_driveid (struct hd_driveid *id)
 344 {
 345 #ifndef __LITTLE_ENDIAN
 346 # ifdef __BIG_ENDIAN
 347         int i;
 348         u16 *stringcast;
 349
 350         id->config         = __le16_to_cpu(id->config);
 351         id->cyls           = __le16_to_cpu(id->cyls);
 352         id->reserved2      = __le16_to_cpu(id->reserved2);
 353         id->heads          = __le16_to_cpu(id->heads);
 354         id->track_bytes    = __le16_to_cpu(id->track_bytes);
 355         id->sector_bytes   = __le16_to_cpu(id->sector_bytes);
 356         id->sectors        = __le16_to_cpu(id->sectors);
 357         id->vendor0        = __le16_to_cpu(id->vendor0);
 358         id->vendor1        = __le16_to_cpu(id->vendor1);
 359         id->vendor2        = __le16_to_cpu(id->vendor2);
 360         stringcast = (u16 *)&id->serial_no[0];
 361         for (i = 0; i < (20/2); i++)
 362                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 363         id->buf_type       = __le16_to_cpu(id->buf_type);
 364         id->buf_size       = __le16_to_cpu(id->buf_size);
 365         id->ecc_bytes      = __le16_to_cpu(id->ecc_bytes);
 366         stringcast = (u16 *)&id->fw_rev[0];
 367         for (i = 0; i < (8/2); i++)
 368                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 369         stringcast = (u16 *)&id->model[0];
 370         for (i = 0; i < (40/2); i++)
 371                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 372         id->dword_io       = __le16_to_cpu(id->dword_io);
 373         id->reserved50     = __le16_to_cpu(id->reserved50);
 374         id->field_valid    = __le16_to_cpu(id->field_valid);
 375         id->cur_cyls       = __le16_to_cpu(id->cur_cyls);
 376         id->cur_heads      = __le16_to_cpu(id->cur_heads);
 377         id->cur_sectors    = __le16_to_cpu(id->cur_sectors);
 378         id->cur_capacity0  = __le16_to_cpu(id->cur_capacity0);
 379         id->cur_capacity1  = __le16_to_cpu(id->cur_capacity1);
 380         id->lba_capacity   = __le32_to_cpu(id->lba_capacity);
 381         id->dma_1word      = __le16_to_cpu(id->dma_1word);
 382         id->dma_mword      = __le16_to_cpu(id->dma_mword);
 383         id->eide_pio_modes = __le16_to_cpu(id->eide_pio_modes);
 384         id->eide_dma_min   = __le16_to_cpu(id->eide_dma_min);
 385         id->eide_dma_time  = __le16_to_cpu(id->eide_dma_time);
 386         id->eide_pio       = __le16_to_cpu(id->eide_pio);
 387         id->eide_pio_iordy = __le16_to_cpu(id->eide_pio_iordy);
 388         for (i = 0; i < 2; ++i)
 389                 id->words69_70[i] = __le16_to_cpu(id->words69_70[i]);
 390         for (i = 0; i < 4; ++i)
 391                 id->words71_74[i] = __le16_to_cpu(id->words71_74[i]);
 392         id->queue_depth    = __le16_to_cpu(id->queue_depth);
 393         for (i = 0; i < 4; ++i)
 394                 id->words76_79[i] = __le16_to_cpu(id->words76_79[i]);
 395         id->major_rev_num  = __le16_to_cpu(id->major_rev_num);
 396         id->minor_rev_num  = __le16_to_cpu(id->minor_rev_num);
 397         id->command_set_1  = __le16_to_cpu(id->command_set_1);
 398         id->command_set_2  = __le16_to_cpu(id->command_set_2);
 399         id->cfsse          = __le16_to_cpu(id->cfsse);
 400         id->cfs_enable_1   = __le16_to_cpu(id->cfs_enable_1);
 401         id->cfs_enable_2   = __le16_to_cpu(id->cfs_enable_2);
 402         id->csf_default    = __le16_to_cpu(id->csf_default);
 403         id->dma_ultra      = __le16_to_cpu(id->dma_ultra);
 404         id->trseuc         = __le16_to_cpu(id->trseuc);
 405         id->trsEuc         = __le16_to_cpu(id->trsEuc);
 406         id->CurAPMvalues   = __le16_to_cpu(id->CurAPMvalues);
 407         id->mprc           = __le16_to_cpu(id->mprc);
 408         id->hw_config      = __le16_to_cpu(id->hw_config);
 409         id->acoustic       = __le16_to_cpu(id->acoustic);
 410         id->msrqs          = __le16_to_cpu(id->msrqs);
 411         id->sxfert         = __le16_to_cpu(id->sxfert);
 412         id->sal            = __le16_to_cpu(id->sal);
 413         id->spg            = __le32_to_cpu(id->spg);
 414         id->lba_capacity_2 = __le64_to_cpu(id->lba_capacity_2);
 415         for (i = 0; i < 22; i++)
 416                 id->words104_125[i]   = __le16_to_cpu(id->words104_125[i]);
 417         id->last_lun       = __le16_to_cpu(id->last_lun);
 418         id->word127        = __le16_to_cpu(id->word127);
 419         id->dlf            = __le16_to_cpu(id->dlf);
 420         id->csfo           = __le16_to_cpu(id->csfo);
 421         for (i = 0; i < 26; i++)
 422                 id->words130_155[i] = __le16_to_cpu(id->words130_155[i]);
 423         id->word156        = __le16_to_cpu(id->word156);
 424         for (i = 0; i < 3; i++)
 425                 id->words157_159[i] = __le16_to_cpu(id->words157_159[i]);
 426         id->cfa_power      = __le16_to_cpu(id->cfa_power);
 427         for (i = 0; i < 14; i++)
 428                 id->words161_175[i] = __le16_to_cpu(id->words161_175[i]);
 429         for (i = 0; i < 31; i++)
 430                 id->words176_205[i] = __le16_to_cpu(id->words176_205[i]);
 431         for (i = 0; i < 48; i++)
 432                 id->words206_254[i] = __le16_to_cpu(id->words206_254[i]);
 433         id->integrity_word  = __le16_to_cpu(id->integrity_word);
 434 # else
 435 #  error "Please fix <asm/byteorder.h>"
 436 # endif
 437 #endif
 438 }
 439
 440 EXPORT_SYMBOL(ide_fix_driveid);
 441
 442 void ide_fixstring (u8 *s, const int bytecount, const int byteswap)
 443 {
 444         u8 *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
 445
 446         if (byteswap) {
 447                 /* convert from big-endian to host byte order */
 448                 for (p = end ; p != s;) {
 449                         unsigned short *pp = (unsigned short *) (p -= 2);
 450                         *pp = ntohs(*pp);
 451                 }
 452         }
 453         /* strip leading blanks */
 454         while (s != end && *s == ' ')
 455                 ++s;
 456         /* compress internal blanks and strip trailing blanks */
 457         while (s != end && *s) {
 458                 if (*s++ != ' ' || (s != end && *s && *s != ' '))
 459                         *p++ = *(s-1);
 460         }
 461         /* wipe out trailing garbage */
 462         while (p != end)
 463                 *p++ = '\0';
 464 }
 465
 466 EXPORT_SYMBOL(ide_fixstring);
 467
 468 /*
 469  * Needed for PCI irq sharing
 470  */
 471 int drive_is_ready (ide_drive_t *drive)
 472 {
 473         ide_hwif_t *hwif        = HWIF(drive);
 474         u8 stat                 = 0;
 475
 476         if (drive->waiting_for_dma)
 477                 return hwif->ide_dma_test_irq(drive);
 478
 479 #if 0
 480         /* need to guarantee 400ns since last command was issued */
 481         udelay(1);
 482 #endif
 483
 484 #ifdef CONFIG_IDEPCI_SHARE_IRQ
 485         /*
 486          * We do a passive status test under shared PCI interrupts on
 487          * cards that truly share the ATA side interrupt, but may also share
 488          * an interrupt with another pci card/device.  We make no assumptions
 489          * about possible isa-pnp and pci-pnp issues yet.
 490          */
 491         if (IDE_CONTROL_REG)
 492                 stat = hwif->INB(IDE_ALTSTATUS_REG);
 493         else
 494 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
 495                 /* Note: this may clear a pending IRQ!! */
 496                 stat = hwif->INB(IDE_STATUS_REG);
 497
 498         if (stat & BUSY_STAT)
 499                 /* drive busy:  definitely not interrupting */
 500                 return 0;
 501
 502         /* drive ready: *might* be interrupting */
 503         return 1;
 504 }
 505
 506 EXPORT_SYMBOL(drive_is_ready);
 507
 508 /*
 509  * Global for All, and taken from ide-pmac.c. Can be called
 510  * with spinlock held & IRQs disabled, so don't schedule !
 511  */
 512 int wait_for_ready (ide_drive_t *drive, int timeout)
 513 {
 514         ide_hwif_t *hwif        = HWIF(drive);
 515         u8 stat                 = 0;
 516
 517         while(--timeout) {
 518                 stat = hwif->INB(IDE_STATUS_REG);
 519                 if (!(stat & BUSY_STAT)) {
 520                         if (drive->ready_stat == 0)
 521                                 break;
 522                         else if ((stat & drive->ready_stat)||(stat & ERR_STAT))
 523                                 break;
 524                 }
 525                 mdelay(1);
 526         }
 527         if ((stat & ERR_STAT) || timeout <= 0) {
 528                 if (stat & ERR_STAT) {
 529                         printk(KERN_ERR "%s: wait_for_ready, "
 530                                 "error status: %x\n", drive->name, stat);
 531                 }
 532                 return 1;
 533         }
 534         return 0;
 535 }
 536
 537 EXPORT_SYMBOL(wait_for_ready);
 538
 539 /*
 540  * This routine busy-waits for the drive status to be not "busy".
 541  * It then checks the status for all of the "good" bits and none
 542  * of the "bad" bits, and if all is okay it returns 0.  All other
 543  * cases return 1 after invoking ide_error() -- caller should just return.
 544  *
 545  * This routine should get fixed to not hog the cpu during extra long waits..
 546  * That could be done by busy-waiting for the first jiffy or two, and then
 547  * setting a timer to wake up at half second intervals thereafter,
 548  * until timeout is achieved, before timing out.
 549  */
 550 int ide_wait_stat (ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout)
 551 {
 552         ide_hwif_t *hwif = HWIF(drive);
 553         u8 stat;
 554         int i;
 555         unsigned long flags;
 556
 557         /* bail early if we've exceeded max_failures */
 558         if (drive->max_failures && (drive->failures > drive->max_failures)) {
 559                 *startstop = ide_stopped;
 560                 return 1;
 561         }
 562
 563         udelay(1);      /* spec allows drive 400ns to assert "BUSY" */
 564         if ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 565                 local_irq_set(flags);
 566                 timeout += jiffies;
 567                 while ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 568                         if (time_after(jiffies, timeout)) {
 569                                 /*
 570                                  * One last read after the timeout in case
 571                                  * heavy interrupt load made us not make any
 572                                  * progress during the timeout..
 573                                  */
 574                                 stat = hwif->INB(IDE_STATUS_REG);
 575                                 if (!(stat & BUSY_STAT))
 576                                         break;
 577
 578                                 local_irq_restore(flags);
 579                                 *startstop = ide_error(drive, "status timeout", stat);
 580                                 return 1;
 581                         }
 582                 }
 583                 local_irq_restore(flags);
 584         }
 585         /*
 586          * Allow status to settle, then read it again.
 587          * A few rare drives vastly violate the 400ns spec here,
 588          * so we'll wait up to 10usec for a "good" status
 589          * rather than expensively fail things immediately.
 590          * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 591          */
 592         for (i = 0; i < 10; i++) {
 593                 udelay(1);
 594                 if (OK_STAT((stat = hwif->INB(IDE_STATUS_REG)), good, bad))
 595                         return 0;
 596         }
 597         *startstop = ide_error(drive, "status error", stat);
 598         return 1;
 599 }
 600
 601 EXPORT_SYMBOL(ide_wait_stat);
 602
 603 /*
 604  *  All hosts that use the 80c ribbon must use!
 605  *  The name is derived from upper byte of word 93 and the 80c ribbon.
 606  */
 607 u8 eighty_ninty_three (ide_drive_t *drive)
 608 {
 609 #if 0
 610         if (!HWIF(drive)->udma_four)
 611                 return 0;
 612
 613         if (drive->id->major_rev_num) {
 614                 int hssbd = 0;
 615                 int i;
 616                 /*
 617                  * Determine highest Supported SPEC
 618                  */
 619                 for (i=1; i<=15; i++)
 620                         if (drive->id->major_rev_num & (1<<i))
 621                                 hssbd++;
 622
 623                 switch (hssbd) {
 624                         case 7:
 625                         case 6:
 626                         case 5:
 627                 /* ATA-4 and older do not support above Ultra 33 */
 628                         default:
 629                                 return 0;
 630                 }
 631         }
 632
 633         return ((u8) (
 634 #ifndef CONFIG_IDEDMA_IVB
 635                 (drive->id->hw_config & 0x4000) &&
 636 #endif /* CONFIG_IDEDMA_IVB */
 637                  (drive->id->hw_config & 0x6000)) ? 1 : 0);
 638
 639 #else
 640
 641         return ((u8) ((HWIF(drive)->udma_four) &&
 642 #ifndef CONFIG_IDEDMA_IVB
 643                         (drive->id->hw_config & 0x4000) &&
 644 #endif /* CONFIG_IDEDMA_IVB */
 645                         (drive->id->hw_config & 0x6000)) ? 1 : 0);
 646 #endif
 647 }
 648
 649 EXPORT_SYMBOL(eighty_ninty_three);
 650
 651 int ide_ata66_check (ide_drive_t *drive, ide_task_t *args)
 652 {
 653         if ((args->tfRegister[IDE_COMMAND_OFFSET] == WIN_SETFEATURES) &&
 654             (args->tfRegister[IDE_SECTOR_OFFSET] > XFER_UDMA_2) &&
 655             (args->tfRegister[IDE_FEATURE_OFFSET] == SETFEATURES_XFER)) {
 656 #ifndef CONFIG_IDEDMA_IVB
 657                 if ((drive->id->hw_config & 0x6000) == 0) {
 658 #else /* !CONFIG_IDEDMA_IVB */
 659                 if (((drive->id->hw_config & 0x2000) == 0) ||
 660                     ((drive->id->hw_config & 0x4000) == 0)) {
 661 #endif /* CONFIG_IDEDMA_IVB */
 662                         printk("%s: Speed warnings UDMA 3/4/5 is not "
 663                                 "functional.\n", drive->name);
 664                         return 1;
 665                 }
 666                 if (!HWIF(drive)->udma_four) {
 667                         printk("%s: Speed warnings UDMA 3/4/5 is not "
 668                                 "functional.\n",
 669                                 HWIF(drive)->name);
 670                         return 1;
 671                 }
 672         }
 673         return 0;
 674 }
 675
 676 /*
 677  * Backside of HDIO_DRIVE_CMD call of SETFEATURES_XFER.
 678  * 1 : Safe to update drive->id DMA registers.
 679  * 0 : OOPs not allowed.
 680  */
 681 int set_transfer (ide_drive_t *drive, ide_task_t *args)
 682 {
 683         if ((args->tfRegister[IDE_COMMAND_OFFSET] == WIN_SETFEATURES) &&
 684             (args->tfRegister[IDE_SECTOR_OFFSET] >= XFER_SW_DMA_0) &&
 685             (args->tfRegister[IDE_FEATURE_OFFSET] == SETFEATURES_XFER) &&
 686             (drive->id->dma_ultra ||
 687              drive->id->dma_mword ||
 688              drive->id->dma_1word))
 689                 return 1;
 690
 691         return 0;
 692 }
 693
 694 #ifdef CONFIG_BLK_DEV_IDEDMA
 695 static u8 ide_auto_reduce_xfer (ide_drive_t *drive)
 696 {
 697         if (!drive->crc_count)
 698                 return drive->current_speed;
 699         drive->crc_count = 0;
 700
 701         switch(drive->current_speed) {
 702                 case XFER_UDMA_7:       return XFER_UDMA_6;
 703                 case XFER_UDMA_6:       return XFER_UDMA_5;
 704                 case XFER_UDMA_5:       return XFER_UDMA_4;
 705                 case XFER_UDMA_4:       return XFER_UDMA_3;
 706                 case XFER_UDMA_3:       return XFER_UDMA_2;
 707                 case XFER_UDMA_2:       return XFER_UDMA_1;
 708                 case XFER_UDMA_1:       return XFER_UDMA_0;
 709                         /*
 710                          * OOPS we do not goto non Ultra DMA modes
 711                          * without iCRC's available we force
 712                          * the system to PIO and make the user
 713                          * invoke the ATA-1 ATA-2 DMA modes.
 714                          */
 715                 case XFER_UDMA_0:
 716                 default:                return XFER_PIO_4;
 717         }
 718 }
 719 #endif /* CONFIG_BLK_DEV_IDEDMA */
 720
 721 /*
 722  * Update the
 723  */
 724 int ide_driveid_update (ide_drive_t *drive)
 725 {
 726         ide_hwif_t *hwif        = HWIF(drive);
 727         struct hd_driveid *id;
 728 #if 0
 729         id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
 730         if (!id)
 731                 return 0;
 732
 733         taskfile_lib_get_identify(drive, (char *)&id);
 734
 735         ide_fix_driveid(id);
 736         if (id) {
 737                 drive->id->dma_ultra = id->dma_ultra;
 738                 drive->id->dma_mword = id->dma_mword;
 739                 drive->id->dma_1word = id->dma_1word;
 740                 /* anything more ? */
 741                 kfree(id);
 742         }
 743         return 1;
 744 #else
 745         /*
 746          * Re-read drive->id for possible DMA mode
 747          * change (copied from ide-probe.c)
 748          */
 749         unsigned long timeout, flags;
 750
 751         SELECT_MASK(drive, 1);
 752         if (IDE_CONTROL_REG)
 753                 hwif->OUTB(drive->ctl,IDE_CONTROL_REG);
 754         msleep(50);
 755         hwif->OUTB(WIN_IDENTIFY, IDE_COMMAND_REG);
 756         timeout = jiffies + WAIT_WORSTCASE;
 757         do {
 758                 if (time_after(jiffies, timeout)) {
 759                         SELECT_MASK(drive, 0);
 760                         return 0;       /* drive timed-out */
 761                 }
 762                 msleep(50);     /* give drive a breather */
 763         } while (hwif->INB(IDE_ALTSTATUS_REG) & BUSY_STAT);
 764         msleep(50);     /* wait for IRQ and DRQ_STAT */
 765         if (!OK_STAT(hwif->INB(IDE_STATUS_REG),DRQ_STAT,BAD_R_STAT)) {
 766                 SELECT_MASK(drive, 0);
 767                 printk("%s: CHECK for good STATUS\n", drive->name);
 768                 return 0;
 769         }
 770         local_irq_save(flags);
 771         SELECT_MASK(drive, 0);
 772         id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
 773         if (!id) {
 774                 local_irq_restore(flags);
 775                 return 0;
 776         }
 777         ata_input_data(drive, id, SECTOR_WORDS);
 778         (void) hwif->INB(IDE_STATUS_REG);       /* clear drive IRQ */
 779         local_irq_enable();
 780         local_irq_restore(flags);
 781         ide_fix_driveid(id);
 782         if (id) {
 783                 drive->id->dma_ultra = id->dma_ultra;
 784                 drive->id->dma_mword = id->dma_mword;
 785                 drive->id->dma_1word = id->dma_1word;
 786                 /* anything more ? */
 787                 kfree(id);
 788         }
 789
 790         return 1;
 791 #endif
 792 }
 793
 794 /*
 795  * Similar to ide_wait_stat(), except it never calls ide_error internally.
 796  * This is a kludge to handle the new ide_config_drive_speed() function,
 797  * and should not otherwise be used anywhere.  Eventually, the tuneproc's
 798  * should be updated to return ide_startstop_t, in which case we can get
 799  * rid of this abomination again.  :)   -ml
 800  *
 801  * It is gone..........
 802  *
 803  * const char *msg == consider adding for verbose errors.
 804  */
 805 int ide_config_drive_speed (ide_drive_t *drive, u8 speed)
 806 {
 807         ide_hwif_t *hwif        = HWIF(drive);
 808         int     i, error        = 1;
 809         u8 stat;
 810
 811 //      while (HWGROUP(drive)->busy)
 812 //              msleep(50);
 813
 814 #ifdef CONFIG_BLK_DEV_IDEDMA
 815         if (hwif->ide_dma_check)         /* check if host supports DMA */
 816                 hwif->ide_dma_host_off(drive);
 817 #endif
 818
 819         /*
 820          * Don't use ide_wait_cmd here - it will
 821          * attempt to set_geometry and recalibrate,
 822          * but for some reason these don't work at
 823          * this point (lost interrupt).
 824          */
 825         /*
 826          * Select the drive, and issue the SETFEATURES command
 827          */
 828         disable_irq_nosync(hwif->irq);
 829
 830         /*
 831          *      FIXME: we race against the running IRQ here if
 832          *      this is called from non IRQ context. If we use
 833          *      disable_irq() we hang on the error path. Work
 834          *      is needed.
 835          */
 836
 837         udelay(1);
 838         SELECT_DRIVE(drive);
 839         SELECT_MASK(drive, 0);
 840         udelay(1);
 841         if (IDE_CONTROL_REG)
 842                 hwif->OUTB(drive->ctl | 2, IDE_CONTROL_REG);
 843         hwif->OUTB(speed, IDE_NSECTOR_REG);
 844         hwif->OUTB(SETFEATURES_XFER, IDE_FEATURE_REG);
 845         hwif->OUTB(WIN_SETFEATURES, IDE_COMMAND_REG);
 846         if ((IDE_CONTROL_REG) && (drive->quirk_list == 2))
 847                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
 848         udelay(1);
 849         /*
 850          * Wait for drive to become non-BUSY
 851          */
 852         if ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 853                 unsigned long flags, timeout;
 854                 local_irq_set(flags);
 855                 timeout = jiffies + WAIT_CMD;
 856                 while ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 857                         if (time_after(jiffies, timeout))
 858                                 break;
 859                 }
 860                 local_irq_restore(flags);
 861         }
 862
 863         /*
 864          * Allow status to settle, then read it again.
 865          * A few rare drives vastly violate the 400ns spec here,
 866          * so we'll wait up to 10usec for a "good" status
 867          * rather than expensively fail things immediately.
 868          * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 869          */
 870         for (i = 0; i < 10; i++) {
 871                 udelay(1);
 872                 if (OK_STAT((stat = hwif->INB(IDE_STATUS_REG)), DRIVE_READY, BUSY_STAT|DRQ_STAT|ERR_STAT)) {
 873                         error = 0;
 874                         break;
 875                 }
 876         }
 877
 878         SELECT_MASK(drive, 0);
 879
 880         enable_irq(hwif->irq);
 881
 882         if (error) {
 883                 (void) ide_dump_status(drive, "set_drive_speed_status", stat);
 884                 return error;
 885         }
 886
 887         drive->id->dma_ultra &= ~0xFF00;
 888         drive->id->dma_mword &= ~0x0F00;
 889         drive->id->dma_1word &= ~0x0F00;
 890
 891 #ifdef CONFIG_BLK_DEV_IDEDMA
 892         if (speed >= XFER_SW_DMA_0)
 893                 hwif->ide_dma_host_on(drive);
 894         else if (hwif->ide_dma_check)   /* check if host supports DMA */
 895                 hwif->ide_dma_off_quietly(drive);
 896 #endif
 897
 898         switch(speed) {
 899                 case XFER_UDMA_7:   drive->id->dma_ultra |= 0x8080; break;
 900                 case XFER_UDMA_6:   drive->id->dma_ultra |= 0x4040; break;
 901                 case XFER_UDMA_5:   drive->id->dma_ultra |= 0x2020; break;
 902                 case XFER_UDMA_4:   drive->id->dma_ultra |= 0x1010; break;
 903                 case XFER_UDMA_3:   drive->id->dma_ultra |= 0x0808; break;
 904                 case XFER_UDMA_2:   drive->id->dma_ultra |= 0x0404; break;
 905                 case XFER_UDMA_1:   drive->id->dma_ultra |= 0x0202; break;
 906                 case XFER_UDMA_0:   drive->id->dma_ultra |= 0x0101; break;
 907                 case XFER_MW_DMA_2: drive->id->dma_mword |= 0x0404; break;
 908                 case XFER_MW_DMA_1: drive->id->dma_mword |= 0x0202; break;
 909                 case XFER_MW_DMA_0: drive->id->dma_mword |= 0x0101; break;
 910                 case XFER_SW_DMA_2: drive->id->dma_1word |= 0x0404; break;
 911                 case XFER_SW_DMA_1: drive->id->dma_1word |= 0x0202; break;
 912                 case XFER_SW_DMA_0: drive->id->dma_1word |= 0x0101; break;
 913                 default: break;
 914         }
 915         if (!drive->init_speed)
 916                 drive->init_speed = speed;
 917         drive->current_speed = speed;
 918         return error;
 919 }
 920
 921 EXPORT_SYMBOL(ide_config_drive_speed);
 922
 923
 924 /*
 925  * This should get invoked any time we exit the driver to
 926  * wait for an interrupt response from a drive.  handler() points
 927  * at the appropriate code to handle the next interrupt, and a
 928  * timer is started to prevent us from waiting forever in case
 929  * something goes wrong (see the ide_timer_expiry() handler later on).
 930  *
 931  * See also ide_execute_command
 932  */
 933 static void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 934                       unsigned int timeout, ide_expiry_t *expiry)
 935 {
 936         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 937
 938         if (hwgroup->handler != NULL) {
 939                 printk(KERN_CRIT "%s: ide_set_handler: handler not null; "
 940                         "old=%p, new=%p\n",
 941                         drive->name, hwgroup->handler, handler);
 942         }
 943         hwgroup->handler        = handler;
 944         hwgroup->expiry         = expiry;
 945         hwgroup->timer.expires  = jiffies + timeout;
 946         add_timer(&hwgroup->timer);
 947 }
 948
 949 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 950                       unsigned int timeout, ide_expiry_t *expiry)
 951 {
 952         unsigned long flags;
 953         spin_lock_irqsave(&ide_lock, flags);
 954         __ide_set_handler(drive, handler, timeout, expiry);
 955         spin_unlock_irqrestore(&ide_lock, flags);
 956 }
 957
 958 EXPORT_SYMBOL(ide_set_handler);
 959
 960 /**
 961  *      ide_execute_command     -       execute an IDE command
 962  *      @drive: IDE drive to issue the command against
 963  *      @command: command byte to write
 964  *      @handler: handler for next phase
 965  *      @timeout: timeout for command
 966  *      @expiry:  handler to run on timeout
 967  *
 968  *      Helper function to issue an IDE command. This handles the
 969  *      atomicity requirements, command timing and ensures that the
 970  *      handler and IRQ setup do not race. All IDE command kick off
 971  *      should go via this function or do equivalent locking.
 972  */
 973
 974 void ide_execute_command(ide_drive_t *drive, task_ioreg_t cmd, ide_handler_t *handler, unsigned timeout, ide_expiry_t *expiry)
 975 {
 976         unsigned long flags;
 977         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 978         ide_hwif_t *hwif = HWIF(drive);
 979
 980         spin_lock_irqsave(&ide_lock, flags);
 981
 982         if(hwgroup->handler)
 983                 BUG();
 984         hwgroup->handler        = handler;
 985         hwgroup->expiry         = expiry;
 986         hwgroup->timer.expires  = jiffies + timeout;
 987         add_timer(&hwgroup->timer);
 988         hwif->OUTBSYNC(drive, cmd, IDE_COMMAND_REG);
 989         /* Drive takes 400nS to respond, we must avoid the IRQ being
 990            serviced before that.
 991
 992            FIXME: we could skip this delay with care on non shared
 993            devices
 994         */
 995         ndelay(400);
 996         spin_unlock_irqrestore(&ide_lock, flags);
 997 }
 998
 999 EXPORT_SYMBOL(ide_execute_command);
1000
1001
1002 /* needed below */
1003 static ide_startstop_t do_reset1 (ide_drive_t *, int);
1004
1005 /*
1006  * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
1007  * during an atapi drive reset operation. If the drive has not yet responded,
1008  * and we have not yet hit our maximum waiting time, then the timer is restarted
1009  * for another 50ms.
1010  */
1011 static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
1012 {
1013         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
1014         ide_hwif_t *hwif        = HWIF(drive);
1015         u8 stat;
1016
1017         SELECT_DRIVE(drive);
1018         udelay (10);
1019
1020         if (OK_STAT(stat = hwif->INB(IDE_STATUS_REG), 0, BUSY_STAT)) {
1021                 printk("%s: ATAPI reset complete\n", drive->name);
1022         } else {
1023                 if (time_before(jiffies, hwgroup->poll_timeout)) {
1024                         if (HWGROUP(drive)->handler != NULL)
1025                                 BUG();
1026                         ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1027                         /* continue polling */
1028                         return ide_started;
1029                 }
1030                 /* end of polling */
1031                 hwgroup->poll_timeout = 0;
1032                 printk("%s: ATAPI reset timed-out, status=0x%02x\n",
1033                                 drive->name, stat);
1034                 /* do it the old fashioned way */
1035                 return do_reset1(drive, 1);
1036         }
1037         /* done polling */
1038         hwgroup->poll_timeout = 0;
1039         return ide_stopped;
1040 }
1041
1042 /*
1043  * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
1044  * during an ide reset operation. If the drives have not yet responded,
1045  * and we have not yet hit our maximum waiting time, then the timer is restarted
1046  * for another 50ms.
1047  */
1048 static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
1049 {
1050         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
1051         ide_hwif_t *hwif        = HWIF(drive);
1052         u8 tmp;
1053
1054         if (hwif->reset_poll != NULL) {
1055                 if (hwif->reset_poll(drive)) {
1056                         printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
1057                                 hwif->name, drive->name);
1058                         return ide_stopped;
1059                 }
1060         }
1061
1062         if (!OK_STAT(tmp = hwif->INB(IDE_STATUS_REG), 0, BUSY_STAT)) {
1063                 if (time_before(jiffies, hwgroup->poll_timeout)) {
1064                         if (HWGROUP(drive)->handler != NULL)
1065                                 BUG();
1066                         ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1067                         /* continue polling */
1068                         return ide_started;
1069                 }
1070                 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
1071                 drive->failures++;
1072         } else  {
1073                 printk("%s: reset: ", hwif->name);
1074                 if ((tmp = hwif->INB(IDE_ERROR_REG)) == 1) {
1075                         printk("success\n");
1076                         drive->failures = 0;
1077                 } else {
1078                         drive->failures++;
1079                         printk("master: ");
1080                         switch (tmp & 0x7f) {
1081                                 case 1: printk("passed");
1082                                         break;
1083                                 case 2: printk("formatter device error");
1084                                         break;
1085                                 case 3: printk("sector buffer error");
1086                                         break;
1087                                 case 4: printk("ECC circuitry error");
1088                                         break;
1089                                 case 5: printk("controlling MPU error");
1090                                         break;
1091                                 default:printk("error (0x%02x?)", tmp);
1092                         }
1093                         if (tmp & 0x80)
1094                                 printk("; slave: failed");
1095                         printk("\n");
1096                 }
1097         }
1098         hwgroup->poll_timeout = 0;      /* done polling */
1099         return ide_stopped;
1100 }
1101
1102 static void check_dma_crc(ide_drive_t *drive)
1103 {
1104 #ifdef CONFIG_BLK_DEV_IDEDMA
1105         if (drive->crc_count) {
1106                 (void) HWIF(drive)->ide_dma_off_quietly(drive);
1107                 ide_set_xfer_rate(drive, ide_auto_reduce_xfer(drive));
1108                 if (drive->current_speed >= XFER_SW_DMA_0)
1109                         (void) HWIF(drive)->ide_dma_on(drive);
1110         } else
1111                 (void)__ide_dma_off(drive);
1112 #endif
1113 }
1114
1115 void pre_reset (ide_drive_t *drive)
1116 {
1117         DRIVER(drive)->pre_reset(drive);
1118
1119         if (!drive->keep_settings) {
1120                 if (drive->using_dma) {
1121                         check_dma_crc(drive);
1122                 } else {
1123                         drive->unmask = 0;
1124                         drive->io_32bit = 0;
1125                 }
1126                 return;
1127         }
1128         if (drive->using_dma)
1129                 check_dma_crc(drive);
1130
1131         if (HWIF(drive)->pre_reset != NULL)
1132                 HWIF(drive)->pre_reset(drive);
1133
1134 }
1135
1136 /*
1137  * do_reset1() attempts to recover a confused drive by resetting it.
1138  * Unfortunately, resetting a disk drive actually resets all devices on
1139  * the same interface, so it can really be thought of as resetting the
1140  * interface rather than resetting the drive.
1141  *
1142  * ATAPI devices have their own reset mechanism which allows them to be
1143  * individually reset without clobbering other devices on the same interface.
1144  *
1145  * Unfortunately, the IDE interface does not generate an interrupt to let
1146  * us know when the reset operation has finished, so we must poll for this.
1147  * Equally poor, though, is the fact that this may a very long time to complete,
1148  * (up to 30 seconds worstcase).  So, instead of busy-waiting here for it,
1149  * we set a timer to poll at 50ms intervals.
1150  */
1151 static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
1152 {
1153         unsigned int unit;
1154         unsigned long flags;
1155         ide_hwif_t *hwif;
1156         ide_hwgroup_t *hwgroup;
1157
1158         spin_lock_irqsave(&ide_lock, flags);
1159         hwif = HWIF(drive);
1160         hwgroup = HWGROUP(drive);
1161
1162         /* We must not reset with running handlers */
1163         if(hwgroup->handler != NULL)
1164                 BUG();
1165
1166         /* For an ATAPI device, first try an ATAPI SRST. */
1167         if (drive->media != ide_disk && !do_not_try_atapi) {
1168                 pre_reset(drive);
1169                 SELECT_DRIVE(drive);
1170                 udelay (20);
1171                 hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
1172                 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1173                 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1174                 spin_unlock_irqrestore(&ide_lock, flags);
1175                 return ide_started;
1176         }
1177
1178         /*
1179          * First, reset any device state data we were maintaining
1180          * for any of the drives on this interface.
1181          */
1182         for (unit = 0; unit < MAX_DRIVES; ++unit)
1183                 pre_reset(&hwif->drives[unit]);
1184
1185 #if OK_TO_RESET_CONTROLLER
1186         if (!IDE_CONTROL_REG) {
1187                 spin_unlock_irqrestore(&ide_lock, flags);
1188                 return ide_stopped;
1189         }
1190
1191         /*
1192          * Note that we also set nIEN while resetting the device,
1193          * to mask unwanted interrupts from the interface during the reset.
1194          * However, due to the design of PC hardware, this will cause an
1195          * immediate interrupt due to the edge transition it produces.
1196          * This single interrupt gives us a "fast poll" for drives that
1197          * recover from reset very quickly, saving us the first 50ms wait time.
1198          */
1199         /* set SRST and nIEN */
1200         hwif->OUTBSYNC(drive, drive->ctl|6,IDE_CONTROL_REG);
1201         /* more than enough time */
1202         udelay(10);
1203         if (drive->quirk_list == 2) {
1204                 /* clear SRST and nIEN */
1205                 hwif->OUTBSYNC(drive, drive->ctl, IDE_CONTROL_REG);
1206         } else {
1207                 /* clear SRST, leave nIEN */
1208                 hwif->OUTBSYNC(drive, drive->ctl|2, IDE_CONTROL_REG);
1209         }
1210         /* more than enough time */
1211         udelay(10);
1212         hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1213         __ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1214
1215         /*
1216          * Some weird controller like resetting themselves to a strange
1217          * state when the disks are reset this way. At least, the Winbond
1218          * 553 documentation says that
1219          */
1220         if (hwif->resetproc != NULL) {
1221                 hwif->resetproc(drive);
1222         }
1223
1224 #endif  /* OK_TO_RESET_CONTROLLER */
1225
1226         spin_unlock_irqrestore(&ide_lock, flags);
1227         return ide_started;
1228 }
1229
1230 /*
1231  * ide_do_reset() is the entry point to the drive/interface reset code.
1232  */
1233
1234 ide_startstop_t ide_do_reset (ide_drive_t *drive)
1235 {
1236         return do_reset1(drive, 0);
1237 }
1238
1239 EXPORT_SYMBOL(ide_do_reset);
1240
1241 /*
1242  * ide_wait_not_busy() waits for the currently selected device on the hwif
1243  * to report a non-busy status, see comments in probe_hwif().
1244  */
1245 int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
1246 {
1247         u8 stat = 0;
1248
1249         while(timeout--) {
1250                 /*
1251                  * Turn this into a schedule() sleep once I'm sure
1252                  * about locking issues (2.5 work ?).
1253                  */
1254                 mdelay(1);
1255                 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
1256                 if ((stat & BUSY_STAT) == 0)
1257                         return 0;
1258                 /*
1259                  * Assume a value of 0xff means nothing is connected to
1260                  * the interface and it doesn't implement the pull-down
1261                  * resistor on D7.
1262                  */
1263                 if (stat == 0xff)
1264                         return -ENODEV;
1265         }
1266         return -EBUSY;
1267 }
1268
1269 EXPORT_SYMBOL_GPL(ide_wait_not_busy);
1270