git.oblomov.eu Git - linux-2.6/blob - 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
  27 #include <asm/byteorder.h>
  28 #include <asm/irq.h>
  29 #include <asm/uaccess.h>
  30 #include <asm/io.h>
  31
  32 /*
  33  *      Conventional PIO operations for ATA devices
  34  */
  35
  36 static u8 ide_inb (unsigned long port)
  37 {
  38         return (u8) inb(port);
  39 }
  40
  41 static u16 ide_inw (unsigned long port)
  42 {
  43         return (u16) inw(port);
  44 }
  45
  46 static void ide_insw (unsigned long port, void *addr, u32 count)
  47 {
  48         insw(port, addr, count);
  49 }
  50
  51 static u32 ide_inl (unsigned long port)
  52 {
  53         return (u32) inl(port);
  54 }
  55
  56 static void ide_insl (unsigned long port, void *addr, u32 count)
  57 {
  58         insl(port, addr, count);
  59 }
  60
  61 static void ide_outb (u8 val, unsigned long port)
  62 {
  63         outb(val, port);
  64 }
  65
  66 static void ide_outbsync (ide_drive_t *drive, u8 addr, unsigned long port)
  67 {
  68         outb(addr, port);
  69 }
  70
  71 static void ide_outw (u16 val, unsigned long port)
  72 {
  73         outw(val, port);
  74 }
  75
  76 static void ide_outsw (unsigned long port, void *addr, u32 count)
  77 {
  78         outsw(port, addr, count);
  79 }
  80
  81 static void ide_outl (u32 val, unsigned long port)
  82 {
  83         outl(val, port);
  84 }
  85
  86 static void ide_outsl (unsigned long port, void *addr, u32 count)
  87 {
  88         outsl(port, addr, count);
  89 }
  90
  91 void default_hwif_iops (ide_hwif_t *hwif)
  92 {
  93         hwif->OUTB      = ide_outb;
  94         hwif->OUTBSYNC  = ide_outbsync;
  95         hwif->OUTW      = ide_outw;
  96         hwif->OUTL      = ide_outl;
  97         hwif->OUTSW     = ide_outsw;
  98         hwif->OUTSL     = ide_outsl;
  99         hwif->INB       = ide_inb;
 100         hwif->INW       = ide_inw;
 101         hwif->INL       = ide_inl;
 102         hwif->INSW      = ide_insw;
 103         hwif->INSL      = ide_insl;
 104 }
 105
 106 /*
 107  *      MMIO operations, typically used for SATA controllers
 108  */
 109
 110 static u8 ide_mm_inb (unsigned long port)
 111 {
 112         return (u8) readb((void __iomem *) port);
 113 }
 114
 115 static u16 ide_mm_inw (unsigned long port)
 116 {
 117         return (u16) readw((void __iomem *) port);
 118 }
 119
 120 static void ide_mm_insw (unsigned long port, void *addr, u32 count)
 121 {
 122         __ide_mm_insw((void __iomem *) port, addr, count);
 123 }
 124
 125 static u32 ide_mm_inl (unsigned long port)
 126 {
 127         return (u32) readl((void __iomem *) port);
 128 }
 129
 130 static void ide_mm_insl (unsigned long port, void *addr, u32 count)
 131 {
 132         __ide_mm_insl((void __iomem *) port, addr, count);
 133 }
 134
 135 static void ide_mm_outb (u8 value, unsigned long port)
 136 {
 137         writeb(value, (void __iomem *) port);
 138 }
 139
 140 static void ide_mm_outbsync (ide_drive_t *drive, u8 value, unsigned long port)
 141 {
 142         writeb(value, (void __iomem *) port);
 143 }
 144
 145 static void ide_mm_outw (u16 value, unsigned long port)
 146 {
 147         writew(value, (void __iomem *) port);
 148 }
 149
 150 static void ide_mm_outsw (unsigned long port, void *addr, u32 count)
 151 {
 152         __ide_mm_outsw((void __iomem *) port, addr, count);
 153 }
 154
 155 static void ide_mm_outl (u32 value, unsigned long port)
 156 {
 157         writel(value, (void __iomem *) port);
 158 }
 159
 160 static void ide_mm_outsl (unsigned long port, void *addr, u32 count)
 161 {
 162         __ide_mm_outsl((void __iomem *) port, addr, count);
 163 }
 164
 165 void default_hwif_mmiops (ide_hwif_t *hwif)
 166 {
 167         hwif->OUTB      = ide_mm_outb;
 168         /* Most systems will need to override OUTBSYNC, alas however
 169            this one is controller specific! */
 170         hwif->OUTBSYNC  = ide_mm_outbsync;
 171         hwif->OUTW      = ide_mm_outw;
 172         hwif->OUTL      = ide_mm_outl;
 173         hwif->OUTSW     = ide_mm_outsw;
 174         hwif->OUTSL     = ide_mm_outsl;
 175         hwif->INB       = ide_mm_inb;
 176         hwif->INW       = ide_mm_inw;
 177         hwif->INL       = ide_mm_inl;
 178         hwif->INSW      = ide_mm_insw;
 179         hwif->INSL      = ide_mm_insl;
 180 }
 181
 182 EXPORT_SYMBOL(default_hwif_mmiops);
 183
 184 u32 ide_read_24 (ide_drive_t *drive)
 185 {
 186         u8 hcyl = HWIF(drive)->INB(IDE_HCYL_REG);
 187         u8 lcyl = HWIF(drive)->INB(IDE_LCYL_REG);
 188         u8 sect = HWIF(drive)->INB(IDE_SECTOR_REG);
 189         return (hcyl<<16)|(lcyl<<8)|sect;
 190 }
 191
 192 void SELECT_DRIVE (ide_drive_t *drive)
 193 {
 194         if (HWIF(drive)->selectproc)
 195                 HWIF(drive)->selectproc(drive);
 196         HWIF(drive)->OUTB(drive->select.all, IDE_SELECT_REG);
 197 }
 198
 199 EXPORT_SYMBOL(SELECT_DRIVE);
 200
 201 void SELECT_INTERRUPT (ide_drive_t *drive)
 202 {
 203         if (HWIF(drive)->intrproc)
 204                 HWIF(drive)->intrproc(drive);
 205         else
 206                 HWIF(drive)->OUTB(drive->ctl|2, IDE_CONTROL_REG);
 207 }
 208
 209 void SELECT_MASK (ide_drive_t *drive, int mask)
 210 {
 211         if (HWIF(drive)->maskproc)
 212                 HWIF(drive)->maskproc(drive, mask);
 213 }
 214
 215 void QUIRK_LIST (ide_drive_t *drive)
 216 {
 217         if (HWIF(drive)->quirkproc)
 218                 drive->quirk_list = HWIF(drive)->quirkproc(drive);
 219 }
 220
 221 /*
 222  * Some localbus EIDE interfaces require a special access sequence
 223  * when using 32-bit I/O instructions to transfer data.  We call this
 224  * the "vlb_sync" sequence, which consists of three successive reads
 225  * of the sector count register location, with interrupts disabled
 226  * to ensure that the reads all happen together.
 227  */
 228 static void ata_vlb_sync(ide_drive_t *drive, unsigned long port)
 229 {
 230         (void) HWIF(drive)->INB(port);
 231         (void) HWIF(drive)->INB(port);
 232         (void) HWIF(drive)->INB(port);
 233 }
 234
 235 /*
 236  * This is used for most PIO data transfers *from* the IDE interface
 237  */
 238 static void ata_input_data(ide_drive_t *drive, void *buffer, u32 wcount)
 239 {
 240         ide_hwif_t *hwif        = HWIF(drive);
 241         u8 io_32bit             = drive->io_32bit;
 242
 243         if (io_32bit) {
 244                 if (io_32bit & 2) {
 245                         unsigned long flags;
 246                         local_irq_save(flags);
 247                         ata_vlb_sync(drive, IDE_NSECTOR_REG);
 248                         hwif->INSL(IDE_DATA_REG, buffer, wcount);
 249                         local_irq_restore(flags);
 250                 } else
 251                         hwif->INSL(IDE_DATA_REG, buffer, wcount);
 252         } else {
 253                 hwif->INSW(IDE_DATA_REG, buffer, wcount<<1);
 254         }
 255 }
 256
 257 /*
 258  * This is used for most PIO data transfers *to* the IDE interface
 259  */
 260 static void ata_output_data(ide_drive_t *drive, void *buffer, u32 wcount)
 261 {
 262         ide_hwif_t *hwif        = HWIF(drive);
 263         u8 io_32bit             = drive->io_32bit;
 264
 265         if (io_32bit) {
 266                 if (io_32bit & 2) {
 267                         unsigned long flags;
 268                         local_irq_save(flags);
 269                         ata_vlb_sync(drive, IDE_NSECTOR_REG);
 270                         hwif->OUTSL(IDE_DATA_REG, buffer, wcount);
 271                         local_irq_restore(flags);
 272                 } else
 273                         hwif->OUTSL(IDE_DATA_REG, buffer, wcount);
 274         } else {
 275                 hwif->OUTSW(IDE_DATA_REG, buffer, wcount<<1);
 276         }
 277 }
 278
 279 /*
 280  * The following routines are mainly used by the ATAPI drivers.
 281  *
 282  * These routines will round up any request for an odd number of bytes,
 283  * so if an odd bytecount is specified, be sure that there's at least one
 284  * extra byte allocated for the buffer.
 285  */
 286
 287 static void atapi_input_bytes(ide_drive_t *drive, void *buffer, u32 bytecount)
 288 {
 289         ide_hwif_t *hwif = HWIF(drive);
 290
 291         ++bytecount;
 292 #if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
 293         if (MACH_IS_ATARI || MACH_IS_Q40) {
 294                 /* Atari has a byte-swapped IDE interface */
 295                 insw_swapw(IDE_DATA_REG, buffer, bytecount / 2);
 296                 return;
 297         }
 298 #endif /* CONFIG_ATARI || CONFIG_Q40 */
 299         hwif->ata_input_data(drive, buffer, bytecount / 4);
 300         if ((bytecount & 0x03) >= 2)
 301                 hwif->INSW(IDE_DATA_REG, ((u8 *)buffer)+(bytecount & ~0x03), 1);
 302 }
 303
 304 static void atapi_output_bytes(ide_drive_t *drive, void *buffer, u32 bytecount)
 305 {
 306         ide_hwif_t *hwif = HWIF(drive);
 307
 308         ++bytecount;
 309 #if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
 310         if (MACH_IS_ATARI || MACH_IS_Q40) {
 311                 /* Atari has a byte-swapped IDE interface */
 312                 outsw_swapw(IDE_DATA_REG, buffer, bytecount / 2);
 313                 return;
 314         }
 315 #endif /* CONFIG_ATARI || CONFIG_Q40 */
 316         hwif->ata_output_data(drive, buffer, bytecount / 4);
 317         if ((bytecount & 0x03) >= 2)
 318                 hwif->OUTSW(IDE_DATA_REG, ((u8*)buffer)+(bytecount & ~0x03), 1);
 319 }
 320
 321 void default_hwif_transport(ide_hwif_t *hwif)
 322 {
 323         hwif->ata_input_data            = ata_input_data;
 324         hwif->ata_output_data           = ata_output_data;
 325         hwif->atapi_input_bytes         = atapi_input_bytes;
 326         hwif->atapi_output_bytes        = atapi_output_bytes;
 327 }
 328
 329 /*
 330  * Beginning of Taskfile OPCODE Library and feature sets.
 331  */
 332 void ide_fix_driveid (struct hd_driveid *id)
 333 {
 334 #ifndef __LITTLE_ENDIAN
 335 # ifdef __BIG_ENDIAN
 336         int i;
 337         u16 *stringcast;
 338
 339         id->config         = __le16_to_cpu(id->config);
 340         id->cyls           = __le16_to_cpu(id->cyls);
 341         id->reserved2      = __le16_to_cpu(id->reserved2);
 342         id->heads          = __le16_to_cpu(id->heads);
 343         id->track_bytes    = __le16_to_cpu(id->track_bytes);
 344         id->sector_bytes   = __le16_to_cpu(id->sector_bytes);
 345         id->sectors        = __le16_to_cpu(id->sectors);
 346         id->vendor0        = __le16_to_cpu(id->vendor0);
 347         id->vendor1        = __le16_to_cpu(id->vendor1);
 348         id->vendor2        = __le16_to_cpu(id->vendor2);
 349         stringcast = (u16 *)&id->serial_no[0];
 350         for (i = 0; i < (20/2); i++)
 351                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 352         id->buf_type       = __le16_to_cpu(id->buf_type);
 353         id->buf_size       = __le16_to_cpu(id->buf_size);
 354         id->ecc_bytes      = __le16_to_cpu(id->ecc_bytes);
 355         stringcast = (u16 *)&id->fw_rev[0];
 356         for (i = 0; i < (8/2); i++)
 357                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 358         stringcast = (u16 *)&id->model[0];
 359         for (i = 0; i < (40/2); i++)
 360                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 361         id->dword_io       = __le16_to_cpu(id->dword_io);
 362         id->reserved50     = __le16_to_cpu(id->reserved50);
 363         id->field_valid    = __le16_to_cpu(id->field_valid);
 364         id->cur_cyls       = __le16_to_cpu(id->cur_cyls);
 365         id->cur_heads      = __le16_to_cpu(id->cur_heads);
 366         id->cur_sectors    = __le16_to_cpu(id->cur_sectors);
 367         id->cur_capacity0  = __le16_to_cpu(id->cur_capacity0);
 368         id->cur_capacity1  = __le16_to_cpu(id->cur_capacity1);
 369         id->lba_capacity   = __le32_to_cpu(id->lba_capacity);
 370         id->dma_1word      = __le16_to_cpu(id->dma_1word);
 371         id->dma_mword      = __le16_to_cpu(id->dma_mword);
 372         id->eide_pio_modes = __le16_to_cpu(id->eide_pio_modes);
 373         id->eide_dma_min   = __le16_to_cpu(id->eide_dma_min);
 374         id->eide_dma_time  = __le16_to_cpu(id->eide_dma_time);
 375         id->eide_pio       = __le16_to_cpu(id->eide_pio);
 376         id->eide_pio_iordy = __le16_to_cpu(id->eide_pio_iordy);
 377         for (i = 0; i < 2; ++i)
 378                 id->words69_70[i] = __le16_to_cpu(id->words69_70[i]);
 379         for (i = 0; i < 4; ++i)
 380                 id->words71_74[i] = __le16_to_cpu(id->words71_74[i]);
 381         id->queue_depth    = __le16_to_cpu(id->queue_depth);
 382         for (i = 0; i < 4; ++i)
 383                 id->words76_79[i] = __le16_to_cpu(id->words76_79[i]);
 384         id->major_rev_num  = __le16_to_cpu(id->major_rev_num);
 385         id->minor_rev_num  = __le16_to_cpu(id->minor_rev_num);
 386         id->command_set_1  = __le16_to_cpu(id->command_set_1);
 387         id->command_set_2  = __le16_to_cpu(id->command_set_2);
 388         id->cfsse          = __le16_to_cpu(id->cfsse);
 389         id->cfs_enable_1   = __le16_to_cpu(id->cfs_enable_1);
 390         id->cfs_enable_2   = __le16_to_cpu(id->cfs_enable_2);
 391         id->csf_default    = __le16_to_cpu(id->csf_default);
 392         id->dma_ultra      = __le16_to_cpu(id->dma_ultra);
 393         id->trseuc         = __le16_to_cpu(id->trseuc);
 394         id->trsEuc         = __le16_to_cpu(id->trsEuc);
 395         id->CurAPMvalues   = __le16_to_cpu(id->CurAPMvalues);
 396         id->mprc           = __le16_to_cpu(id->mprc);
 397         id->hw_config      = __le16_to_cpu(id->hw_config);
 398         id->acoustic       = __le16_to_cpu(id->acoustic);
 399         id->msrqs          = __le16_to_cpu(id->msrqs);
 400         id->sxfert         = __le16_to_cpu(id->sxfert);
 401         id->sal            = __le16_to_cpu(id->sal);
 402         id->spg            = __le32_to_cpu(id->spg);
 403         id->lba_capacity_2 = __le64_to_cpu(id->lba_capacity_2);
 404         for (i = 0; i < 22; i++)
 405                 id->words104_125[i]   = __le16_to_cpu(id->words104_125[i]);
 406         id->last_lun       = __le16_to_cpu(id->last_lun);
 407         id->word127        = __le16_to_cpu(id->word127);
 408         id->dlf            = __le16_to_cpu(id->dlf);
 409         id->csfo           = __le16_to_cpu(id->csfo);
 410         for (i = 0; i < 26; i++)
 411                 id->words130_155[i] = __le16_to_cpu(id->words130_155[i]);
 412         id->word156        = __le16_to_cpu(id->word156);
 413         for (i = 0; i < 3; i++)
 414                 id->words157_159[i] = __le16_to_cpu(id->words157_159[i]);
 415         id->cfa_power      = __le16_to_cpu(id->cfa_power);
 416         for (i = 0; i < 14; i++)
 417                 id->words161_175[i] = __le16_to_cpu(id->words161_175[i]);
 418         for (i = 0; i < 31; i++)
 419                 id->words176_205[i] = __le16_to_cpu(id->words176_205[i]);
 420         for (i = 0; i < 48; i++)
 421                 id->words206_254[i] = __le16_to_cpu(id->words206_254[i]);
 422         id->integrity_word  = __le16_to_cpu(id->integrity_word);
 423 # else
 424 #  error "Please fix <asm/byteorder.h>"
 425 # endif
 426 #endif
 427 }
 428
 429 /* FIXME: exported for use by the USB storage (isd200.c) code only */
 430 EXPORT_SYMBOL(ide_fix_driveid);
 431
 432 void ide_fixstring (u8 *s, const int bytecount, const int byteswap)
 433 {
 434         u8 *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
 435
 436         if (byteswap) {
 437                 /* convert from big-endian to host byte order */
 438                 for (p = end ; p != s;) {
 439                         unsigned short *pp = (unsigned short *) (p -= 2);
 440                         *pp = ntohs(*pp);
 441                 }
 442         }
 443         /* strip leading blanks */
 444         while (s != end && *s == ' ')
 445                 ++s;
 446         /* compress internal blanks and strip trailing blanks */
 447         while (s != end && *s) {
 448                 if (*s++ != ' ' || (s != end && *s && *s != ' '))
 449                         *p++ = *(s-1);
 450         }
 451         /* wipe out trailing garbage */
 452         while (p != end)
 453                 *p++ = '\0';
 454 }
 455
 456 EXPORT_SYMBOL(ide_fixstring);
 457
 458 /*
 459  * Needed for PCI irq sharing
 460  */
 461 int drive_is_ready (ide_drive_t *drive)
 462 {
 463         ide_hwif_t *hwif        = HWIF(drive);
 464         u8 stat                 = 0;
 465
 466         if (drive->waiting_for_dma)
 467                 return hwif->ide_dma_test_irq(drive);
 468
 469 #if 0
 470         /* need to guarantee 400ns since last command was issued */
 471         udelay(1);
 472 #endif
 473
 474 #ifdef CONFIG_IDEPCI_SHARE_IRQ
 475         /*
 476          * We do a passive status test under shared PCI interrupts on
 477          * cards that truly share the ATA side interrupt, but may also share
 478          * an interrupt with another pci card/device.  We make no assumptions
 479          * about possible isa-pnp and pci-pnp issues yet.
 480          */
 481         if (IDE_CONTROL_REG)
 482                 stat = hwif->INB(IDE_ALTSTATUS_REG);
 483         else
 484 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
 485                 /* Note: this may clear a pending IRQ!! */
 486                 stat = hwif->INB(IDE_STATUS_REG);
 487
 488         if (stat & BUSY_STAT)
 489                 /* drive busy:  definitely not interrupting */
 490                 return 0;
 491
 492         /* drive ready: *might* be interrupting */
 493         return 1;
 494 }
 495
 496 EXPORT_SYMBOL(drive_is_ready);
 497
 498 /*
 499  * Global for All, and taken from ide-pmac.c. Can be called
 500  * with spinlock held & IRQs disabled, so don't schedule !
 501  */
 502 int wait_for_ready (ide_drive_t *drive, int timeout)
 503 {
 504         ide_hwif_t *hwif        = HWIF(drive);
 505         u8 stat                 = 0;
 506
 507         while(--timeout) {
 508                 stat = hwif->INB(IDE_STATUS_REG);
 509                 if (!(stat & BUSY_STAT)) {
 510                         if (drive->ready_stat == 0)
 511                                 break;
 512                         else if ((stat & drive->ready_stat)||(stat & ERR_STAT))
 513                                 break;
 514                 }
 515                 mdelay(1);
 516         }
 517         if ((stat & ERR_STAT) || timeout <= 0) {
 518                 if (stat & ERR_STAT) {
 519                         printk(KERN_ERR "%s: wait_for_ready, "
 520                                 "error status: %x\n", drive->name, stat);
 521                 }
 522                 return 1;
 523         }
 524         return 0;
 525 }
 526
 527 /*
 528  * This routine busy-waits for the drive status to be not "busy".
 529  * It then checks the status for all of the "good" bits and none
 530  * of the "bad" bits, and if all is okay it returns 0.  All other
 531  * cases return 1 after invoking ide_error() -- caller should just return.
 532  *
 533  * This routine should get fixed to not hog the cpu during extra long waits..
 534  * That could be done by busy-waiting for the first jiffy or two, and then
 535  * setting a timer to wake up at half second intervals thereafter,
 536  * until timeout is achieved, before timing out.
 537  */
 538 int ide_wait_stat (ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout)
 539 {
 540         ide_hwif_t *hwif = HWIF(drive);
 541         u8 stat;
 542         int i;
 543         unsigned long flags;
 544
 545         /* bail early if we've exceeded max_failures */
 546         if (drive->max_failures && (drive->failures > drive->max_failures)) {
 547                 *startstop = ide_stopped;
 548                 return 1;
 549         }
 550
 551         udelay(1);      /* spec allows drive 400ns to assert "BUSY" */
 552         if ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 553                 local_irq_set(flags);
 554                 timeout += jiffies;
 555                 while ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 556                         if (time_after(jiffies, timeout)) {
 557                                 /*
 558                                  * One last read after the timeout in case
 559                                  * heavy interrupt load made us not make any
 560                                  * progress during the timeout..
 561                                  */
 562                                 stat = hwif->INB(IDE_STATUS_REG);
 563                                 if (!(stat & BUSY_STAT))
 564                                         break;
 565
 566                                 local_irq_restore(flags);
 567                                 *startstop = ide_error(drive, "status timeout", stat);
 568                                 return 1;
 569                         }
 570                 }
 571                 local_irq_restore(flags);
 572         }
 573         /*
 574          * Allow status to settle, then read it again.
 575          * A few rare drives vastly violate the 400ns spec here,
 576          * so we'll wait up to 10usec for a "good" status
 577          * rather than expensively fail things immediately.
 578          * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 579          */
 580         for (i = 0; i < 10; i++) {
 581                 udelay(1);
 582                 if (OK_STAT((stat = hwif->INB(IDE_STATUS_REG)), good, bad))
 583                         return 0;
 584         }
 585         *startstop = ide_error(drive, "status error", stat);
 586         return 1;
 587 }
 588
 589 EXPORT_SYMBOL(ide_wait_stat);
 590
 591 /*
 592  *  All hosts that use the 80c ribbon must use!
 593  *  The name is derived from upper byte of word 93 and the 80c ribbon.
 594  */
 595 u8 eighty_ninty_three (ide_drive_t *drive)
 596 {
 597         if(HWIF(drive)->udma_four == 0)
 598                 return 0;
 599
 600         /* Check for SATA but only if we are ATA5 or higher */
 601         if (drive->id->hw_config == 0 && (drive->id->major_rev_num & 0x7FE0))
 602                 return 1;
 603         if (!(drive->id->hw_config & 0x6000))
 604                 return 0;
 605 #ifndef CONFIG_IDEDMA_IVB
 606         if(!(drive->id->hw_config & 0x4000))
 607                 return 0;
 608 #endif /* CONFIG_IDEDMA_IVB */
 609         return 1;
 610 }
 611
 612 EXPORT_SYMBOL(eighty_ninty_three);
 613
 614 int ide_ata66_check (ide_drive_t *drive, ide_task_t *args)
 615 {
 616         if ((args->tfRegister[IDE_COMMAND_OFFSET] == WIN_SETFEATURES) &&
 617             (args->tfRegister[IDE_SECTOR_OFFSET] > XFER_UDMA_2) &&
 618             (args->tfRegister[IDE_FEATURE_OFFSET] == SETFEATURES_XFER)) {
 619 #ifndef CONFIG_IDEDMA_IVB
 620                 if ((drive->id->hw_config & 0x6000) == 0) {
 621 #else /* !CONFIG_IDEDMA_IVB */
 622                 if (((drive->id->hw_config & 0x2000) == 0) ||
 623                     ((drive->id->hw_config & 0x4000) == 0)) {
 624 #endif /* CONFIG_IDEDMA_IVB */
 625                         printk("%s: Speed warnings UDMA 3/4/5 is not "
 626                                 "functional.\n", drive->name);
 627                         return 1;
 628                 }
 629                 if (!HWIF(drive)->udma_four) {
 630                         printk("%s: Speed warnings UDMA 3/4/5 is not "
 631                                 "functional.\n",
 632                                 HWIF(drive)->name);
 633                         return 1;
 634                 }
 635         }
 636         return 0;
 637 }
 638
 639 /*
 640  * Backside of HDIO_DRIVE_CMD call of SETFEATURES_XFER.
 641  * 1 : Safe to update drive->id DMA registers.
 642  * 0 : OOPs not allowed.
 643  */
 644 int set_transfer (ide_drive_t *drive, ide_task_t *args)
 645 {
 646         if ((args->tfRegister[IDE_COMMAND_OFFSET] == WIN_SETFEATURES) &&
 647             (args->tfRegister[IDE_SECTOR_OFFSET] >= XFER_SW_DMA_0) &&
 648             (args->tfRegister[IDE_FEATURE_OFFSET] == SETFEATURES_XFER) &&
 649             (drive->id->dma_ultra ||
 650              drive->id->dma_mword ||
 651              drive->id->dma_1word))
 652                 return 1;
 653
 654         return 0;
 655 }
 656
 657 #ifdef CONFIG_BLK_DEV_IDEDMA
 658 static u8 ide_auto_reduce_xfer (ide_drive_t *drive)
 659 {
 660         if (!drive->crc_count)
 661                 return drive->current_speed;
 662         drive->crc_count = 0;
 663
 664         switch(drive->current_speed) {
 665                 case XFER_UDMA_7:       return XFER_UDMA_6;
 666                 case XFER_UDMA_6:       return XFER_UDMA_5;
 667                 case XFER_UDMA_5:       return XFER_UDMA_4;
 668                 case XFER_UDMA_4:       return XFER_UDMA_3;
 669                 case XFER_UDMA_3:       return XFER_UDMA_2;
 670                 case XFER_UDMA_2:       return XFER_UDMA_1;
 671                 case XFER_UDMA_1:       return XFER_UDMA_0;
 672                         /*
 673                          * OOPS we do not goto non Ultra DMA modes
 674                          * without iCRC's available we force
 675                          * the system to PIO and make the user
 676                          * invoke the ATA-1 ATA-2 DMA modes.
 677                          */
 678                 case XFER_UDMA_0:
 679                 default:                return XFER_PIO_4;
 680         }
 681 }
 682 #endif /* CONFIG_BLK_DEV_IDEDMA */
 683
 684 /*
 685  * Update the
 686  */
 687 int ide_driveid_update (ide_drive_t *drive)
 688 {
 689         ide_hwif_t *hwif        = HWIF(drive);
 690         struct hd_driveid *id;
 691 #if 0
 692         id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
 693         if (!id)
 694                 return 0;
 695
 696         taskfile_lib_get_identify(drive, (char *)&id);
 697
 698         ide_fix_driveid(id);
 699         if (id) {
 700                 drive->id->dma_ultra = id->dma_ultra;
 701                 drive->id->dma_mword = id->dma_mword;
 702                 drive->id->dma_1word = id->dma_1word;
 703                 /* anything more ? */
 704                 kfree(id);
 705         }
 706         return 1;
 707 #else
 708         /*
 709          * Re-read drive->id for possible DMA mode
 710          * change (copied from ide-probe.c)
 711          */
 712         unsigned long timeout, flags;
 713
 714         SELECT_MASK(drive, 1);
 715         if (IDE_CONTROL_REG)
 716                 hwif->OUTB(drive->ctl,IDE_CONTROL_REG);
 717         msleep(50);
 718         hwif->OUTB(WIN_IDENTIFY, IDE_COMMAND_REG);
 719         timeout = jiffies + WAIT_WORSTCASE;
 720         do {
 721                 if (time_after(jiffies, timeout)) {
 722                         SELECT_MASK(drive, 0);
 723                         return 0;       /* drive timed-out */
 724                 }
 725                 msleep(50);     /* give drive a breather */
 726         } while (hwif->INB(IDE_ALTSTATUS_REG) & BUSY_STAT);
 727         msleep(50);     /* wait for IRQ and DRQ_STAT */
 728         if (!OK_STAT(hwif->INB(IDE_STATUS_REG),DRQ_STAT,BAD_R_STAT)) {
 729                 SELECT_MASK(drive, 0);
 730                 printk("%s: CHECK for good STATUS\n", drive->name);
 731                 return 0;
 732         }
 733         local_irq_save(flags);
 734         SELECT_MASK(drive, 0);
 735         id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
 736         if (!id) {
 737                 local_irq_restore(flags);
 738                 return 0;
 739         }
 740         ata_input_data(drive, id, SECTOR_WORDS);
 741         (void) hwif->INB(IDE_STATUS_REG);       /* clear drive IRQ */
 742         local_irq_enable();
 743         local_irq_restore(flags);
 744         ide_fix_driveid(id);
 745         if (id) {
 746                 drive->id->dma_ultra = id->dma_ultra;
 747                 drive->id->dma_mword = id->dma_mword;
 748                 drive->id->dma_1word = id->dma_1word;
 749                 /* anything more ? */
 750                 kfree(id);
 751         }
 752
 753         return 1;
 754 #endif
 755 }
 756
 757 /*
 758  * Similar to ide_wait_stat(), except it never calls ide_error internally.
 759  * This is a kludge to handle the new ide_config_drive_speed() function,
 760  * and should not otherwise be used anywhere.  Eventually, the tuneproc's
 761  * should be updated to return ide_startstop_t, in which case we can get
 762  * rid of this abomination again.  :)   -ml
 763  *
 764  * It is gone..........
 765  *
 766  * const char *msg == consider adding for verbose errors.
 767  */
 768 int ide_config_drive_speed (ide_drive_t *drive, u8 speed)
 769 {
 770         ide_hwif_t *hwif        = HWIF(drive);
 771         int     i, error        = 1;
 772         u8 stat;
 773
 774 //      while (HWGROUP(drive)->busy)
 775 //              msleep(50);
 776
 777 #ifdef CONFIG_BLK_DEV_IDEDMA
 778         if (hwif->ide_dma_check)         /* check if host supports DMA */
 779                 hwif->ide_dma_host_off(drive);
 780 #endif
 781
 782         /*
 783          * Don't use ide_wait_cmd here - it will
 784          * attempt to set_geometry and recalibrate,
 785          * but for some reason these don't work at
 786          * this point (lost interrupt).
 787          */
 788         /*
 789          * Select the drive, and issue the SETFEATURES command
 790          */
 791         disable_irq_nosync(hwif->irq);
 792
 793         /*
 794          *      FIXME: we race against the running IRQ here if
 795          *      this is called from non IRQ context. If we use
 796          *      disable_irq() we hang on the error path. Work
 797          *      is needed.
 798          */
 799
 800         udelay(1);
 801         SELECT_DRIVE(drive);
 802         SELECT_MASK(drive, 0);
 803         udelay(1);
 804         if (IDE_CONTROL_REG)
 805                 hwif->OUTB(drive->ctl | 2, IDE_CONTROL_REG);
 806         hwif->OUTB(speed, IDE_NSECTOR_REG);
 807         hwif->OUTB(SETFEATURES_XFER, IDE_FEATURE_REG);
 808         hwif->OUTB(WIN_SETFEATURES, IDE_COMMAND_REG);
 809         if ((IDE_CONTROL_REG) && (drive->quirk_list == 2))
 810                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
 811         udelay(1);
 812         /*
 813          * Wait for drive to become non-BUSY
 814          */
 815         if ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 816                 unsigned long flags, timeout;
 817                 local_irq_set(flags);
 818                 timeout = jiffies + WAIT_CMD;
 819                 while ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 820                         if (time_after(jiffies, timeout))
 821                                 break;
 822                 }
 823                 local_irq_restore(flags);
 824         }
 825
 826         /*
 827          * Allow status to settle, then read it again.
 828          * A few rare drives vastly violate the 400ns spec here,
 829          * so we'll wait up to 10usec for a "good" status
 830          * rather than expensively fail things immediately.
 831          * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 832          */
 833         for (i = 0; i < 10; i++) {
 834                 udelay(1);
 835                 if (OK_STAT((stat = hwif->INB(IDE_STATUS_REG)), DRIVE_READY, BUSY_STAT|DRQ_STAT|ERR_STAT)) {
 836                         error = 0;
 837                         break;
 838                 }
 839         }
 840
 841         SELECT_MASK(drive, 0);
 842
 843         enable_irq(hwif->irq);
 844
 845         if (error) {
 846                 (void) ide_dump_status(drive, "set_drive_speed_status", stat);
 847                 return error;
 848         }
 849
 850         drive->id->dma_ultra &= ~0xFF00;
 851         drive->id->dma_mword &= ~0x0F00;
 852         drive->id->dma_1word &= ~0x0F00;
 853
 854 #ifdef CONFIG_BLK_DEV_IDEDMA
 855         if (speed >= XFER_SW_DMA_0)
 856                 hwif->ide_dma_host_on(drive);
 857         else if (hwif->ide_dma_check)   /* check if host supports DMA */
 858                 hwif->ide_dma_off_quietly(drive);
 859 #endif
 860
 861         switch(speed) {
 862                 case XFER_UDMA_7:   drive->id->dma_ultra |= 0x8080; break;
 863                 case XFER_UDMA_6:   drive->id->dma_ultra |= 0x4040; break;
 864                 case XFER_UDMA_5:   drive->id->dma_ultra |= 0x2020; break;
 865                 case XFER_UDMA_4:   drive->id->dma_ultra |= 0x1010; break;
 866                 case XFER_UDMA_3:   drive->id->dma_ultra |= 0x0808; break;
 867                 case XFER_UDMA_2:   drive->id->dma_ultra |= 0x0404; break;
 868                 case XFER_UDMA_1:   drive->id->dma_ultra |= 0x0202; break;
 869                 case XFER_UDMA_0:   drive->id->dma_ultra |= 0x0101; break;
 870                 case XFER_MW_DMA_2: drive->id->dma_mword |= 0x0404; break;
 871                 case XFER_MW_DMA_1: drive->id->dma_mword |= 0x0202; break;
 872                 case XFER_MW_DMA_0: drive->id->dma_mword |= 0x0101; break;
 873                 case XFER_SW_DMA_2: drive->id->dma_1word |= 0x0404; break;
 874                 case XFER_SW_DMA_1: drive->id->dma_1word |= 0x0202; break;
 875                 case XFER_SW_DMA_0: drive->id->dma_1word |= 0x0101; break;
 876                 default: break;
 877         }
 878         if (!drive->init_speed)
 879                 drive->init_speed = speed;
 880         drive->current_speed = speed;
 881         return error;
 882 }
 883
 884 EXPORT_SYMBOL(ide_config_drive_speed);
 885
 886
 887 /*
 888  * This should get invoked any time we exit the driver to
 889  * wait for an interrupt response from a drive.  handler() points
 890  * at the appropriate code to handle the next interrupt, and a
 891  * timer is started to prevent us from waiting forever in case
 892  * something goes wrong (see the ide_timer_expiry() handler later on).
 893  *
 894  * See also ide_execute_command
 895  */
 896 static void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 897                       unsigned int timeout, ide_expiry_t *expiry)
 898 {
 899         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 900
 901         if (hwgroup->handler != NULL) {
 902                 printk(KERN_CRIT "%s: ide_set_handler: handler not null; "
 903                         "old=%p, new=%p\n",
 904                         drive->name, hwgroup->handler, handler);
 905         }
 906         hwgroup->handler        = handler;
 907         hwgroup->expiry         = expiry;
 908         hwgroup->timer.expires  = jiffies + timeout;
 909         add_timer(&hwgroup->timer);
 910 }
 911
 912 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 913                       unsigned int timeout, ide_expiry_t *expiry)
 914 {
 915         unsigned long flags;
 916         spin_lock_irqsave(&ide_lock, flags);
 917         __ide_set_handler(drive, handler, timeout, expiry);
 918         spin_unlock_irqrestore(&ide_lock, flags);
 919 }
 920
 921 EXPORT_SYMBOL(ide_set_handler);
 922
 923 /**
 924  *      ide_execute_command     -       execute an IDE command
 925  *      @drive: IDE drive to issue the command against
 926  *      @command: command byte to write
 927  *      @handler: handler for next phase
 928  *      @timeout: timeout for command
 929  *      @expiry:  handler to run on timeout
 930  *
 931  *      Helper function to issue an IDE command. This handles the
 932  *      atomicity requirements, command timing and ensures that the
 933  *      handler and IRQ setup do not race. All IDE command kick off
 934  *      should go via this function or do equivalent locking.
 935  */
 936
 937 void ide_execute_command(ide_drive_t *drive, task_ioreg_t cmd, ide_handler_t *handler, unsigned timeout, ide_expiry_t *expiry)
 938 {
 939         unsigned long flags;
 940         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 941         ide_hwif_t *hwif = HWIF(drive);
 942
 943         spin_lock_irqsave(&ide_lock, flags);
 944
 945         BUG_ON(hwgroup->handler);
 946         hwgroup->handler        = handler;
 947         hwgroup->expiry         = expiry;
 948         hwgroup->timer.expires  = jiffies + timeout;
 949         add_timer(&hwgroup->timer);
 950         hwif->OUTBSYNC(drive, cmd, IDE_COMMAND_REG);
 951         /* Drive takes 400nS to respond, we must avoid the IRQ being
 952            serviced before that.
 953
 954            FIXME: we could skip this delay with care on non shared
 955            devices
 956         */
 957         ndelay(400);
 958         spin_unlock_irqrestore(&ide_lock, flags);
 959 }
 960
 961 EXPORT_SYMBOL(ide_execute_command);
 962
 963
 964 /* needed below */
 965 static ide_startstop_t do_reset1 (ide_drive_t *, int);
 966
 967 /*
 968  * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 969  * during an atapi drive reset operation. If the drive has not yet responded,
 970  * and we have not yet hit our maximum waiting time, then the timer is restarted
 971  * for another 50ms.
 972  */
 973 static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
 974 {
 975         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
 976         ide_hwif_t *hwif        = HWIF(drive);
 977         u8 stat;
 978
 979         SELECT_DRIVE(drive);
 980         udelay (10);
 981
 982         if (OK_STAT(stat = hwif->INB(IDE_STATUS_REG), 0, BUSY_STAT)) {
 983                 printk("%s: ATAPI reset complete\n", drive->name);
 984         } else {
 985                 if (time_before(jiffies, hwgroup->poll_timeout)) {
 986                         BUG_ON(HWGROUP(drive)->handler != NULL);
 987                         ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
 988                         /* continue polling */
 989                         return ide_started;
 990                 }
 991                 /* end of polling */
 992                 hwgroup->polling = 0;
 993                 printk("%s: ATAPI reset timed-out, status=0x%02x\n",
 994                                 drive->name, stat);
 995                 /* do it the old fashioned way */
 996                 return do_reset1(drive, 1);
 997         }
 998         /* done polling */
 999         hwgroup->polling = 0;
1000         return ide_stopped;
1001 }
1002
1003 /*
1004  * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
1005  * during an ide reset operation. If the drives have not yet responded,
1006  * and we have not yet hit our maximum waiting time, then the timer is restarted
1007  * for another 50ms.
1008  */
1009 static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
1010 {
1011         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
1012         ide_hwif_t *hwif        = HWIF(drive);
1013         u8 tmp;
1014
1015         if (hwif->reset_poll != NULL) {
1016                 if (hwif->reset_poll(drive)) {
1017                         printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
1018                                 hwif->name, drive->name);
1019                         return ide_stopped;
1020                 }
1021         }
1022
1023         if (!OK_STAT(tmp = hwif->INB(IDE_STATUS_REG), 0, BUSY_STAT)) {
1024                 if (time_before(jiffies, hwgroup->poll_timeout)) {
1025                         BUG_ON(HWGROUP(drive)->handler != NULL);
1026                         ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1027                         /* continue polling */
1028                         return ide_started;
1029                 }
1030                 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
1031                 drive->failures++;
1032         } else  {
1033                 printk("%s: reset: ", hwif->name);
1034                 if ((tmp = hwif->INB(IDE_ERROR_REG)) == 1) {
1035                         printk("success\n");
1036                         drive->failures = 0;
1037                 } else {
1038                         drive->failures++;
1039                         printk("master: ");
1040                         switch (tmp & 0x7f) {
1041                                 case 1: printk("passed");
1042                                         break;
1043                                 case 2: printk("formatter device error");
1044                                         break;
1045                                 case 3: printk("sector buffer error");
1046                                         break;
1047                                 case 4: printk("ECC circuitry error");
1048                                         break;
1049                                 case 5: printk("controlling MPU error");
1050                                         break;
1051                                 default:printk("error (0x%02x?)", tmp);
1052                         }
1053                         if (tmp & 0x80)
1054                                 printk("; slave: failed");
1055                         printk("\n");
1056                 }
1057         }
1058         hwgroup->polling = 0;   /* done polling */
1059         return ide_stopped;
1060 }
1061
1062 static void check_dma_crc(ide_drive_t *drive)
1063 {
1064 #ifdef CONFIG_BLK_DEV_IDEDMA
1065         if (drive->crc_count) {
1066                 (void) HWIF(drive)->ide_dma_off_quietly(drive);
1067                 ide_set_xfer_rate(drive, ide_auto_reduce_xfer(drive));
1068                 if (drive->current_speed >= XFER_SW_DMA_0)
1069                         (void) HWIF(drive)->ide_dma_on(drive);
1070         } else
1071                 (void)__ide_dma_off(drive);
1072 #endif
1073 }
1074
1075 static void ide_disk_pre_reset(ide_drive_t *drive)
1076 {
1077         int legacy = (drive->id->cfs_enable_2 & 0x0400) ? 0 : 1;
1078
1079         drive->special.all = 0;
1080         drive->special.b.set_geometry = legacy;
1081         drive->special.b.recalibrate  = legacy;
1082         if (OK_TO_RESET_CONTROLLER)
1083                 drive->mult_count = 0;
1084         if (!drive->keep_settings && !drive->using_dma)
1085                 drive->mult_req = 0;
1086         if (drive->mult_req != drive->mult_count)
1087                 drive->special.b.set_multmode = 1;
1088 }
1089
1090 static void pre_reset(ide_drive_t *drive)
1091 {
1092         if (drive->media == ide_disk)
1093                 ide_disk_pre_reset(drive);
1094         else
1095                 drive->post_reset = 1;
1096
1097         if (!drive->keep_settings) {
1098                 if (drive->using_dma) {
1099                         check_dma_crc(drive);
1100                 } else {
1101                         drive->unmask = 0;
1102                         drive->io_32bit = 0;
1103                 }
1104                 return;
1105         }
1106         if (drive->using_dma)
1107                 check_dma_crc(drive);
1108
1109         if (HWIF(drive)->pre_reset != NULL)
1110                 HWIF(drive)->pre_reset(drive);
1111
1112 }
1113
1114 /*
1115  * do_reset1() attempts to recover a confused drive by resetting it.
1116  * Unfortunately, resetting a disk drive actually resets all devices on
1117  * the same interface, so it can really be thought of as resetting the
1118  * interface rather than resetting the drive.
1119  *
1120  * ATAPI devices have their own reset mechanism which allows them to be
1121  * individually reset without clobbering other devices on the same interface.
1122  *
1123  * Unfortunately, the IDE interface does not generate an interrupt to let
1124  * us know when the reset operation has finished, so we must poll for this.
1125  * Equally poor, though, is the fact that this may a very long time to complete,
1126  * (up to 30 seconds worstcase).  So, instead of busy-waiting here for it,
1127  * we set a timer to poll at 50ms intervals.
1128  */
1129 static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
1130 {
1131         unsigned int unit;
1132         unsigned long flags;
1133         ide_hwif_t *hwif;
1134         ide_hwgroup_t *hwgroup;
1135
1136         spin_lock_irqsave(&ide_lock, flags);
1137         hwif = HWIF(drive);
1138         hwgroup = HWGROUP(drive);
1139
1140         /* We must not reset with running handlers */
1141         BUG_ON(hwgroup->handler != NULL);
1142
1143         /* For an ATAPI device, first try an ATAPI SRST. */
1144         if (drive->media != ide_disk && !do_not_try_atapi) {
1145                 pre_reset(drive);
1146                 SELECT_DRIVE(drive);
1147                 udelay (20);
1148                 hwif->OUTBSYNC(drive, WIN_SRST, IDE_COMMAND_REG);
1149                 ndelay(400);
1150                 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1151                 hwgroup->polling = 1;
1152                 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1153                 spin_unlock_irqrestore(&ide_lock, flags);
1154                 return ide_started;
1155         }
1156
1157         /*
1158          * First, reset any device state data we were maintaining
1159          * for any of the drives on this interface.
1160          */
1161         for (unit = 0; unit < MAX_DRIVES; ++unit)
1162                 pre_reset(&hwif->drives[unit]);
1163
1164 #if OK_TO_RESET_CONTROLLER
1165         if (!IDE_CONTROL_REG) {
1166                 spin_unlock_irqrestore(&ide_lock, flags);
1167                 return ide_stopped;
1168         }
1169
1170         /*
1171          * Note that we also set nIEN while resetting the device,
1172          * to mask unwanted interrupts from the interface during the reset.
1173          * However, due to the design of PC hardware, this will cause an
1174          * immediate interrupt due to the edge transition it produces.
1175          * This single interrupt gives us a "fast poll" for drives that
1176          * recover from reset very quickly, saving us the first 50ms wait time.
1177          */
1178         /* set SRST and nIEN */
1179         hwif->OUTBSYNC(drive, drive->ctl|6,IDE_CONTROL_REG);
1180         /* more than enough time */
1181         udelay(10);
1182         if (drive->quirk_list == 2) {
1183                 /* clear SRST and nIEN */
1184                 hwif->OUTBSYNC(drive, drive->ctl, IDE_CONTROL_REG);
1185         } else {
1186                 /* clear SRST, leave nIEN */
1187                 hwif->OUTBSYNC(drive, drive->ctl|2, IDE_CONTROL_REG);
1188         }
1189         /* more than enough time */
1190         udelay(10);
1191         hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1192         hwgroup->polling = 1;
1193         __ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1194
1195         /*
1196          * Some weird controller like resetting themselves to a strange
1197          * state when the disks are reset this way. At least, the Winbond
1198          * 553 documentation says that
1199          */
1200         if (hwif->resetproc != NULL) {
1201                 hwif->resetproc(drive);
1202         }
1203
1204 #endif  /* OK_TO_RESET_CONTROLLER */
1205
1206         spin_unlock_irqrestore(&ide_lock, flags);
1207         return ide_started;
1208 }
1209
1210 /*
1211  * ide_do_reset() is the entry point to the drive/interface reset code.
1212  */
1213
1214 ide_startstop_t ide_do_reset (ide_drive_t *drive)
1215 {
1216         return do_reset1(drive, 0);
1217 }
1218
1219 EXPORT_SYMBOL(ide_do_reset);
1220
1221 /*
1222  * ide_wait_not_busy() waits for the currently selected device on the hwif
1223  * to report a non-busy status, see comments in probe_hwif().
1224  */
1225 int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
1226 {
1227         u8 stat = 0;
1228
1229         while(timeout--) {
1230                 /*
1231                  * Turn this into a schedule() sleep once I'm sure
1232                  * about locking issues (2.5 work ?).
1233                  */
1234                 mdelay(1);
1235                 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
1236                 if ((stat & BUSY_STAT) == 0)
1237                         return 0;
1238                 /*
1239                  * Assume a value of 0xff means nothing is connected to
1240                  * the interface and it doesn't implement the pull-down
1241                  * resistor on D7.
1242                  */
1243                 if (stat == 0xff)
1244                         return -ENODEV;
1245                 touch_softlockup_watchdog();
1246         }
1247         return -EBUSY;
1248 }
1249
1250 EXPORT_SYMBOL_GPL(ide_wait_not_busy);
1251