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
  27 #include <asm/byteorder.h>
  28 #include <asm/irq.h>
  29 #include <asm/uaccess.h>
  30 #include <asm/io.h>
  31 #include <asm/bitops.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(port);
 116 }
 117
 118 static u16 ide_mm_inw (unsigned long port)
 119 {
 120         return (u16) readw(port);
 121 }
 122
 123 static void ide_mm_insw (unsigned long port, void *addr, u32 count)
 124 {
 125         __ide_mm_insw(port, addr, count);
 126 }
 127
 128 static u32 ide_mm_inl (unsigned long port)
 129 {
 130         return (u32) readl(port);
 131 }
 132
 133 static void ide_mm_insl (unsigned long port, void *addr, u32 count)
 134 {
 135         __ide_mm_insl(port, addr, count);
 136 }
 137
 138 static void ide_mm_outb (u8 value, unsigned long port)
 139 {
 140         writeb(value, port);
 141 }
 142
 143 static void ide_mm_outbsync (ide_drive_t *drive, u8 value, unsigned long port)
 144 {
 145         writeb(value, port);
 146 }
 147
 148 static void ide_mm_outw (u16 value, unsigned long port)
 149 {
 150         writew(value, port);
 151 }
 152
 153 static void ide_mm_outsw (unsigned long port, void *addr, u32 count)
 154 {
 155         __ide_mm_outsw(port, addr, count);
 156 }
 157
 158 static void ide_mm_outl (u32 value, unsigned long port)
 159 {
 160         writel(value, port);
 161 }
 162
 163 static void ide_mm_outsl (unsigned long port, void *addr, u32 count)
 164 {
 165         __ide_mm_outsl(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 EXPORT_SYMBOL(SELECT_INTERRUPT);
 225
 226 void SELECT_MASK (ide_drive_t *drive, int mask)
 227 {
 228         if (HWIF(drive)->maskproc)
 229                 HWIF(drive)->maskproc(drive, mask);
 230 }
 231
 232 EXPORT_SYMBOL(SELECT_MASK);
 233
 234 void QUIRK_LIST (ide_drive_t *drive)
 235 {
 236         if (HWIF(drive)->quirkproc)
 237                 drive->quirk_list = HWIF(drive)->quirkproc(drive);
 238 }
 239
 240 EXPORT_SYMBOL(QUIRK_LIST);
 241
 242 /*
 243  * Some localbus EIDE interfaces require a special access sequence
 244  * when using 32-bit I/O instructions to transfer data.  We call this
 245  * the "vlb_sync" sequence, which consists of three successive reads
 246  * of the sector count register location, with interrupts disabled
 247  * to ensure that the reads all happen together.
 248  */
 249 void ata_vlb_sync (ide_drive_t *drive, unsigned long port)
 250 {
 251         (void) HWIF(drive)->INB(port);
 252         (void) HWIF(drive)->INB(port);
 253         (void) HWIF(drive)->INB(port);
 254 }
 255
 256 EXPORT_SYMBOL(ata_vlb_sync);
 257
 258 /*
 259  * This is used for most PIO data transfers *from* the IDE interface
 260  */
 261 void ata_input_data (ide_drive_t *drive, void *buffer, u32 wcount)
 262 {
 263         ide_hwif_t *hwif        = HWIF(drive);
 264         u8 io_32bit             = drive->io_32bit;
 265
 266         if (io_32bit) {
 267                 if (io_32bit & 2) {
 268                         unsigned long flags;
 269                         local_irq_save(flags);
 270                         ata_vlb_sync(drive, IDE_NSECTOR_REG);
 271                         hwif->INSL(IDE_DATA_REG, buffer, wcount);
 272                         local_irq_restore(flags);
 273                 } else
 274                         hwif->INSL(IDE_DATA_REG, buffer, wcount);
 275         } else {
 276                 hwif->INSW(IDE_DATA_REG, buffer, wcount<<1);
 277         }
 278 }
 279
 280 EXPORT_SYMBOL(ata_input_data);
 281
 282 /*
 283  * This is used for most PIO data transfers *to* the IDE interface
 284  */
 285 void ata_output_data (ide_drive_t *drive, void *buffer, u32 wcount)
 286 {
 287         ide_hwif_t *hwif        = HWIF(drive);
 288         u8 io_32bit             = drive->io_32bit;
 289
 290         if (io_32bit) {
 291                 if (io_32bit & 2) {
 292                         unsigned long flags;
 293                         local_irq_save(flags);
 294                         ata_vlb_sync(drive, IDE_NSECTOR_REG);
 295                         hwif->OUTSL(IDE_DATA_REG, buffer, wcount);
 296                         local_irq_restore(flags);
 297                 } else
 298                         hwif->OUTSL(IDE_DATA_REG, buffer, wcount);
 299         } else {
 300                 hwif->OUTSW(IDE_DATA_REG, buffer, wcount<<1);
 301         }
 302 }
 303
 304 EXPORT_SYMBOL(ata_output_data);
 305
 306 /*
 307  * The following routines are mainly used by the ATAPI drivers.
 308  *
 309  * These routines will round up any request for an odd number of bytes,
 310  * so if an odd bytecount is specified, be sure that there's at least one
 311  * extra byte allocated for the buffer.
 312  */
 313
 314 void atapi_input_bytes (ide_drive_t *drive, void *buffer, u32 bytecount)
 315 {
 316         ide_hwif_t *hwif = HWIF(drive);
 317
 318         ++bytecount;
 319 #if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
 320         if (MACH_IS_ATARI || MACH_IS_Q40) {
 321                 /* Atari has a byte-swapped IDE interface */
 322                 insw_swapw(IDE_DATA_REG, buffer, bytecount / 2);
 323                 return;
 324         }
 325 #endif /* CONFIG_ATARI || CONFIG_Q40 */
 326         hwif->ata_input_data(drive, buffer, bytecount / 4);
 327         if ((bytecount & 0x03) >= 2)
 328                 hwif->INSW(IDE_DATA_REG, ((u8 *)buffer)+(bytecount & ~0x03), 1);
 329 }
 330
 331 EXPORT_SYMBOL(atapi_input_bytes);
 332
 333 void atapi_output_bytes (ide_drive_t *drive, void *buffer, u32 bytecount)
 334 {
 335         ide_hwif_t *hwif = HWIF(drive);
 336
 337         ++bytecount;
 338 #if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
 339         if (MACH_IS_ATARI || MACH_IS_Q40) {
 340                 /* Atari has a byte-swapped IDE interface */
 341                 outsw_swapw(IDE_DATA_REG, buffer, bytecount / 2);
 342                 return;
 343         }
 344 #endif /* CONFIG_ATARI || CONFIG_Q40 */
 345         hwif->ata_output_data(drive, buffer, bytecount / 4);
 346         if ((bytecount & 0x03) >= 2)
 347                 hwif->OUTSW(IDE_DATA_REG, ((u8*)buffer)+(bytecount & ~0x03), 1);
 348 }
 349
 350 EXPORT_SYMBOL(atapi_output_bytes);
 351
 352 /*
 353  * Beginning of Taskfile OPCODE Library and feature sets.
 354  */
 355 void ide_fix_driveid (struct hd_driveid *id)
 356 {
 357 #ifndef __LITTLE_ENDIAN
 358 # ifdef __BIG_ENDIAN
 359         int i;
 360         u16 *stringcast;
 361
 362         id->config         = __le16_to_cpu(id->config);
 363         id->cyls           = __le16_to_cpu(id->cyls);
 364         id->reserved2      = __le16_to_cpu(id->reserved2);
 365         id->heads          = __le16_to_cpu(id->heads);
 366         id->track_bytes    = __le16_to_cpu(id->track_bytes);
 367         id->sector_bytes   = __le16_to_cpu(id->sector_bytes);
 368         id->sectors        = __le16_to_cpu(id->sectors);
 369         id->vendor0        = __le16_to_cpu(id->vendor0);
 370         id->vendor1        = __le16_to_cpu(id->vendor1);
 371         id->vendor2        = __le16_to_cpu(id->vendor2);
 372         stringcast = (u16 *)&id->serial_no[0];
 373         for (i = 0; i < (20/2); i++)
 374                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 375         id->buf_type       = __le16_to_cpu(id->buf_type);
 376         id->buf_size       = __le16_to_cpu(id->buf_size);
 377         id->ecc_bytes      = __le16_to_cpu(id->ecc_bytes);
 378         stringcast = (u16 *)&id->fw_rev[0];
 379         for (i = 0; i < (8/2); i++)
 380                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 381         stringcast = (u16 *)&id->model[0];
 382         for (i = 0; i < (40/2); i++)
 383                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 384         id->dword_io       = __le16_to_cpu(id->dword_io);
 385         id->reserved50     = __le16_to_cpu(id->reserved50);
 386         id->field_valid    = __le16_to_cpu(id->field_valid);
 387         id->cur_cyls       = __le16_to_cpu(id->cur_cyls);
 388         id->cur_heads      = __le16_to_cpu(id->cur_heads);
 389         id->cur_sectors    = __le16_to_cpu(id->cur_sectors);
 390         id->cur_capacity0  = __le16_to_cpu(id->cur_capacity0);
 391         id->cur_capacity1  = __le16_to_cpu(id->cur_capacity1);
 392         id->lba_capacity   = __le32_to_cpu(id->lba_capacity);
 393         id->dma_1word      = __le16_to_cpu(id->dma_1word);
 394         id->dma_mword      = __le16_to_cpu(id->dma_mword);
 395         id->eide_pio_modes = __le16_to_cpu(id->eide_pio_modes);
 396         id->eide_dma_min   = __le16_to_cpu(id->eide_dma_min);
 397         id->eide_dma_time  = __le16_to_cpu(id->eide_dma_time);
 398         id->eide_pio       = __le16_to_cpu(id->eide_pio);
 399         id->eide_pio_iordy = __le16_to_cpu(id->eide_pio_iordy);
 400         for (i = 0; i < 2; ++i)
 401                 id->words69_70[i] = __le16_to_cpu(id->words69_70[i]);
 402         for (i = 0; i < 4; ++i)
 403                 id->words71_74[i] = __le16_to_cpu(id->words71_74[i]);
 404         id->queue_depth    = __le16_to_cpu(id->queue_depth);
 405         for (i = 0; i < 4; ++i)
 406                 id->words76_79[i] = __le16_to_cpu(id->words76_79[i]);
 407         id->major_rev_num  = __le16_to_cpu(id->major_rev_num);
 408         id->minor_rev_num  = __le16_to_cpu(id->minor_rev_num);
 409         id->command_set_1  = __le16_to_cpu(id->command_set_1);
 410         id->command_set_2  = __le16_to_cpu(id->command_set_2);
 411         id->cfsse          = __le16_to_cpu(id->cfsse);
 412         id->cfs_enable_1   = __le16_to_cpu(id->cfs_enable_1);
 413         id->cfs_enable_2   = __le16_to_cpu(id->cfs_enable_2);
 414         id->csf_default    = __le16_to_cpu(id->csf_default);
 415         id->dma_ultra      = __le16_to_cpu(id->dma_ultra);
 416         id->trseuc         = __le16_to_cpu(id->trseuc);
 417         id->trsEuc         = __le16_to_cpu(id->trsEuc);
 418         id->CurAPMvalues   = __le16_to_cpu(id->CurAPMvalues);
 419         id->mprc           = __le16_to_cpu(id->mprc);
 420         id->hw_config      = __le16_to_cpu(id->hw_config);
 421         id->acoustic       = __le16_to_cpu(id->acoustic);
 422         id->msrqs          = __le16_to_cpu(id->msrqs);
 423         id->sxfert         = __le16_to_cpu(id->sxfert);
 424         id->sal            = __le16_to_cpu(id->sal);
 425         id->spg            = __le32_to_cpu(id->spg);
 426         id->lba_capacity_2 = __le64_to_cpu(id->lba_capacity_2);
 427         for (i = 0; i < 22; i++)
 428                 id->words104_125[i]   = __le16_to_cpu(id->words104_125[i]);
 429         id->last_lun       = __le16_to_cpu(id->last_lun);
 430         id->word127        = __le16_to_cpu(id->word127);
 431         id->dlf            = __le16_to_cpu(id->dlf);
 432         id->csfo           = __le16_to_cpu(id->csfo);
 433         for (i = 0; i < 26; i++)
 434                 id->words130_155[i] = __le16_to_cpu(id->words130_155[i]);
 435         id->word156        = __le16_to_cpu(id->word156);
 436         for (i = 0; i < 3; i++)
 437                 id->words157_159[i] = __le16_to_cpu(id->words157_159[i]);
 438         id->cfa_power      = __le16_to_cpu(id->cfa_power);
 439         for (i = 0; i < 14; i++)
 440                 id->words161_175[i] = __le16_to_cpu(id->words161_175[i]);
 441         for (i = 0; i < 31; i++)
 442                 id->words176_205[i] = __le16_to_cpu(id->words176_205[i]);
 443         for (i = 0; i < 48; i++)
 444                 id->words206_254[i] = __le16_to_cpu(id->words206_254[i]);
 445         id->integrity_word  = __le16_to_cpu(id->integrity_word);
 446 # else
 447 #  error "Please fix <asm/byteorder.h>"
 448 # endif
 449 #endif
 450 }
 451
 452 EXPORT_SYMBOL(ide_fix_driveid);
 453
 454 void ide_fixstring (u8 *s, const int bytecount, const int byteswap)
 455 {
 456         u8 *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
 457
 458         if (byteswap) {
 459                 /* convert from big-endian to host byte order */
 460                 for (p = end ; p != s;) {
 461                         unsigned short *pp = (unsigned short *) (p -= 2);
 462                         *pp = ntohs(*pp);
 463                 }
 464         }
 465         /* strip leading blanks */
 466         while (s != end && *s == ' ')
 467                 ++s;
 468         /* compress internal blanks and strip trailing blanks */
 469         while (s != end && *s) {
 470                 if (*s++ != ' ' || (s != end && *s && *s != ' '))
 471                         *p++ = *(s-1);
 472         }
 473         /* wipe out trailing garbage */
 474         while (p != end)
 475                 *p++ = '\0';
 476 }
 477
 478 EXPORT_SYMBOL(ide_fixstring);
 479
 480 /*
 481  * Needed for PCI irq sharing
 482  */
 483 int drive_is_ready (ide_drive_t *drive)
 484 {
 485         ide_hwif_t *hwif        = HWIF(drive);
 486         u8 stat                 = 0;
 487
 488         if (drive->waiting_for_dma)
 489                 return hwif->ide_dma_test_irq(drive);
 490
 491 #if 0
 492         /* need to guarantee 400ns since last command was issued */
 493         udelay(1);
 494 #endif
 495
 496 #ifdef CONFIG_IDEPCI_SHARE_IRQ
 497         /*
 498          * We do a passive status test under shared PCI interrupts on
 499          * cards that truly share the ATA side interrupt, but may also share
 500          * an interrupt with another pci card/device.  We make no assumptions
 501          * about possible isa-pnp and pci-pnp issues yet.
 502          */
 503         if (IDE_CONTROL_REG)
 504                 stat = hwif->INB(IDE_ALTSTATUS_REG);
 505         else
 506 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
 507                 /* Note: this may clear a pending IRQ!! */
 508                 stat = hwif->INB(IDE_STATUS_REG);
 509
 510         if (stat & BUSY_STAT)
 511                 /* drive busy:  definitely not interrupting */
 512                 return 0;
 513
 514         /* drive ready: *might* be interrupting */
 515         return 1;
 516 }
 517
 518 EXPORT_SYMBOL(drive_is_ready);
 519
 520 /*
 521  * Global for All, and taken from ide-pmac.c. Can be called
 522  * with spinlock held & IRQs disabled, so don't schedule !
 523  */
 524 int wait_for_ready (ide_drive_t *drive, int timeout)
 525 {
 526         ide_hwif_t *hwif        = HWIF(drive);
 527         u8 stat                 = 0;
 528
 529         while(--timeout) {
 530                 stat = hwif->INB(IDE_STATUS_REG);
 531                 if (!(stat & BUSY_STAT)) {
 532                         if (drive->ready_stat == 0)
 533                                 break;
 534                         else if ((stat & drive->ready_stat)||(stat & ERR_STAT))
 535                                 break;
 536                 }
 537                 mdelay(1);
 538         }
 539         if ((stat & ERR_STAT) || timeout <= 0) {
 540                 if (stat & ERR_STAT) {
 541                         printk(KERN_ERR "%s: wait_for_ready, "
 542                                 "error status: %x\n", drive->name, stat);
 543                 }
 544                 return 1;
 545         }
 546         return 0;
 547 }
 548
 549 EXPORT_SYMBOL(wait_for_ready);
 550
 551 /*
 552  * This routine busy-waits for the drive status to be not "busy".
 553  * It then checks the status for all of the "good" bits and none
 554  * of the "bad" bits, and if all is okay it returns 0.  All other
 555  * cases return 1 after invoking ide_error() -- caller should just return.
 556  *
 557  * This routine should get fixed to not hog the cpu during extra long waits..
 558  * That could be done by busy-waiting for the first jiffy or two, and then
 559  * setting a timer to wake up at half second intervals thereafter,
 560  * until timeout is achieved, before timing out.
 561  */
 562 int ide_wait_stat (ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout)
 563 {
 564         ide_hwif_t *hwif = HWIF(drive);
 565         u8 stat;
 566         int i;
 567         unsigned long flags;
 568
 569         /* bail early if we've exceeded max_failures */
 570         if (drive->max_failures && (drive->failures > drive->max_failures)) {
 571                 *startstop = ide_stopped;
 572                 return 1;
 573         }
 574
 575         udelay(1);      /* spec allows drive 400ns to assert "BUSY" */
 576         if ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 577                 local_irq_set(flags);
 578                 timeout += jiffies;
 579                 while ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 580                         if (time_after(jiffies, timeout)) {
 581                                 /*
 582                                  * One last read after the timeout in case
 583                                  * heavy interrupt load made us not make any
 584                                  * progress during the timeout..
 585                                  */
 586                                 stat = hwif->INB(IDE_STATUS_REG);
 587                                 if (!(stat & BUSY_STAT))
 588                                         break;
 589
 590                                 local_irq_restore(flags);
 591                                 *startstop = DRIVER(drive)->error(drive, "status timeout", stat);
 592                                 return 1;
 593                         }
 594                 }
 595                 local_irq_restore(flags);
 596         }
 597         /*
 598          * Allow status to settle, then read it again.
 599          * A few rare drives vastly violate the 400ns spec here,
 600          * so we'll wait up to 10usec for a "good" status
 601          * rather than expensively fail things immediately.
 602          * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 603          */
 604         for (i = 0; i < 10; i++) {
 605                 udelay(1);
 606                 if (OK_STAT((stat = hwif->INB(IDE_STATUS_REG)), good, bad))
 607                         return 0;
 608         }
 609         *startstop = DRIVER(drive)->error(drive, "status error", stat);
 610         return 1;
 611 }
 612
 613 EXPORT_SYMBOL(ide_wait_stat);
 614
 615 /*
 616  *  All hosts that use the 80c ribbon must use!
 617  *  The name is derived from upper byte of word 93 and the 80c ribbon.
 618  */
 619 u8 eighty_ninty_three (ide_drive_t *drive)
 620 {
 621 #if 0
 622         if (!HWIF(drive)->udma_four)
 623                 return 0;
 624
 625         if (drive->id->major_rev_num) {
 626                 int hssbd = 0;
 627                 int i;
 628                 /*
 629                  * Determine highest Supported SPEC
 630                  */
 631                 for (i=1; i<=15; i++)
 632                         if (drive->id->major_rev_num & (1<<i))
 633                                 hssbd++;
 634
 635                 switch (hssbd) {
 636                         case 7:
 637                         case 6:
 638                         case 5:
 639                 /* ATA-4 and older do not support above Ultra 33 */
 640                         default:
 641                                 return 0;
 642                 }
 643         }
 644
 645         return ((u8) (
 646 #ifndef CONFIG_IDEDMA_IVB
 647                 (drive->id->hw_config & 0x4000) &&
 648 #endif /* CONFIG_IDEDMA_IVB */
 649                  (drive->id->hw_config & 0x6000)) ? 1 : 0);
 650
 651 #else
 652
 653         return ((u8) ((HWIF(drive)->udma_four) &&
 654 #ifndef CONFIG_IDEDMA_IVB
 655                         (drive->id->hw_config & 0x4000) &&
 656 #endif /* CONFIG_IDEDMA_IVB */
 657                         (drive->id->hw_config & 0x6000)) ? 1 : 0);
 658 #endif
 659 }
 660
 661 EXPORT_SYMBOL(eighty_ninty_three);
 662
 663 int ide_ata66_check (ide_drive_t *drive, ide_task_t *args)
 664 {
 665         if ((args->tfRegister[IDE_COMMAND_OFFSET] == WIN_SETFEATURES) &&
 666             (args->tfRegister[IDE_SECTOR_OFFSET] > XFER_UDMA_2) &&
 667             (args->tfRegister[IDE_FEATURE_OFFSET] == SETFEATURES_XFER)) {
 668 #ifndef CONFIG_IDEDMA_IVB
 669                 if ((drive->id->hw_config & 0x6000) == 0) {
 670 #else /* !CONFIG_IDEDMA_IVB */
 671                 if (((drive->id->hw_config & 0x2000) == 0) ||
 672                     ((drive->id->hw_config & 0x4000) == 0)) {
 673 #endif /* CONFIG_IDEDMA_IVB */
 674                         printk("%s: Speed warnings UDMA 3/4/5 is not "
 675                                 "functional.\n", drive->name);
 676                         return 1;
 677                 }
 678                 if (!HWIF(drive)->udma_four) {
 679                         printk("%s: Speed warnings UDMA 3/4/5 is not "
 680                                 "functional.\n",
 681                                 HWIF(drive)->name);
 682                         return 1;
 683                 }
 684         }
 685         return 0;
 686 }
 687
 688 EXPORT_SYMBOL(ide_ata66_check);
 689
 690 /*
 691  * Backside of HDIO_DRIVE_CMD call of SETFEATURES_XFER.
 692  * 1 : Safe to update drive->id DMA registers.
 693  * 0 : OOPs not allowed.
 694  */
 695 int set_transfer (ide_drive_t *drive, ide_task_t *args)
 696 {
 697         if ((args->tfRegister[IDE_COMMAND_OFFSET] == WIN_SETFEATURES) &&
 698             (args->tfRegister[IDE_SECTOR_OFFSET] >= XFER_SW_DMA_0) &&
 699             (args->tfRegister[IDE_FEATURE_OFFSET] == SETFEATURES_XFER) &&
 700             (drive->id->dma_ultra ||
 701              drive->id->dma_mword ||
 702              drive->id->dma_1word))
 703                 return 1;
 704
 705         return 0;
 706 }
 707
 708 EXPORT_SYMBOL(set_transfer);
 709
 710 u8 ide_auto_reduce_xfer (ide_drive_t *drive)
 711 {
 712         if (!drive->crc_count)
 713                 return drive->current_speed;
 714         drive->crc_count = 0;
 715
 716         switch(drive->current_speed) {
 717                 case XFER_UDMA_7:       return XFER_UDMA_6;
 718                 case XFER_UDMA_6:       return XFER_UDMA_5;
 719                 case XFER_UDMA_5:       return XFER_UDMA_4;
 720                 case XFER_UDMA_4:       return XFER_UDMA_3;
 721                 case XFER_UDMA_3:       return XFER_UDMA_2;
 722                 case XFER_UDMA_2:       return XFER_UDMA_1;
 723                 case XFER_UDMA_1:       return XFER_UDMA_0;
 724                         /*
 725                          * OOPS we do not goto non Ultra DMA modes
 726                          * without iCRC's available we force
 727                          * the system to PIO and make the user
 728                          * invoke the ATA-1 ATA-2 DMA modes.
 729                          */
 730                 case XFER_UDMA_0:
 731                 default:                return XFER_PIO_4;
 732         }
 733 }
 734
 735 EXPORT_SYMBOL(ide_auto_reduce_xfer);
 736
 737 /*
 738  * Update the
 739  */
 740 int ide_driveid_update (ide_drive_t *drive)
 741 {
 742         ide_hwif_t *hwif        = HWIF(drive);
 743         struct hd_driveid *id;
 744 #if 0
 745         id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
 746         if (!id)
 747                 return 0;
 748
 749         taskfile_lib_get_identify(drive, (char *)&id);
 750
 751         ide_fix_driveid(id);
 752         if (id) {
 753                 drive->id->dma_ultra = id->dma_ultra;
 754                 drive->id->dma_mword = id->dma_mword;
 755                 drive->id->dma_1word = id->dma_1word;
 756                 /* anything more ? */
 757                 kfree(id);
 758         }
 759         return 1;
 760 #else
 761         /*
 762          * Re-read drive->id for possible DMA mode
 763          * change (copied from ide-probe.c)
 764          */
 765         unsigned long timeout, flags;
 766
 767         SELECT_MASK(drive, 1);
 768         if (IDE_CONTROL_REG)
 769                 hwif->OUTB(drive->ctl,IDE_CONTROL_REG);
 770         msleep(50);
 771         hwif->OUTB(WIN_IDENTIFY, IDE_COMMAND_REG);
 772         timeout = jiffies + WAIT_WORSTCASE;
 773         do {
 774                 if (time_after(jiffies, timeout)) {
 775                         SELECT_MASK(drive, 0);
 776                         return 0;       /* drive timed-out */
 777                 }
 778                 msleep(50);     /* give drive a breather */
 779         } while (hwif->INB(IDE_ALTSTATUS_REG) & BUSY_STAT);
 780         msleep(50);     /* wait for IRQ and DRQ_STAT */
 781         if (!OK_STAT(hwif->INB(IDE_STATUS_REG),DRQ_STAT,BAD_R_STAT)) {
 782                 SELECT_MASK(drive, 0);
 783                 printk("%s: CHECK for good STATUS\n", drive->name);
 784                 return 0;
 785         }
 786         local_irq_save(flags);
 787         SELECT_MASK(drive, 0);
 788         id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
 789         if (!id) {
 790                 local_irq_restore(flags);
 791                 return 0;
 792         }
 793         ata_input_data(drive, id, SECTOR_WORDS);
 794         (void) hwif->INB(IDE_STATUS_REG);       /* clear drive IRQ */
 795         local_irq_enable();
 796         local_irq_restore(flags);
 797         ide_fix_driveid(id);
 798         if (id) {
 799                 drive->id->dma_ultra = id->dma_ultra;
 800                 drive->id->dma_mword = id->dma_mword;
 801                 drive->id->dma_1word = id->dma_1word;
 802                 /* anything more ? */
 803                 kfree(id);
 804         }
 805
 806         return 1;
 807 #endif
 808 }
 809
 810 EXPORT_SYMBOL(ide_driveid_update);
 811
 812 /*
 813  * Similar to ide_wait_stat(), except it never calls ide_error internally.
 814  * This is a kludge to handle the new ide_config_drive_speed() function,
 815  * and should not otherwise be used anywhere.  Eventually, the tuneproc's
 816  * should be updated to return ide_startstop_t, in which case we can get
 817  * rid of this abomination again.  :)   -ml
 818  *
 819  * It is gone..........
 820  *
 821  * const char *msg == consider adding for verbose errors.
 822  */
 823 int ide_config_drive_speed (ide_drive_t *drive, u8 speed)
 824 {
 825         ide_hwif_t *hwif        = HWIF(drive);
 826         int     i, error        = 1;
 827         u8 stat;
 828
 829 //      while (HWGROUP(drive)->busy)
 830 //              msleep(50);
 831
 832 #ifdef CONFIG_BLK_DEV_IDEDMA
 833         if (hwif->ide_dma_check)         /* check if host supports DMA */
 834                 hwif->ide_dma_host_off(drive);
 835 #endif
 836
 837         /*
 838          * Don't use ide_wait_cmd here - it will
 839          * attempt to set_geometry and recalibrate,
 840          * but for some reason these don't work at
 841          * this point (lost interrupt).
 842          */
 843         /*
 844          * Select the drive, and issue the SETFEATURES command
 845          */
 846         disable_irq_nosync(hwif->irq);
 847
 848         /*
 849          *      FIXME: we race against the running IRQ here if
 850          *      this is called from non IRQ context. If we use
 851          *      disable_irq() we hang on the error path. Work
 852          *      is needed.
 853          */
 854
 855         udelay(1);
 856         SELECT_DRIVE(drive);
 857         SELECT_MASK(drive, 0);
 858         udelay(1);
 859         if (IDE_CONTROL_REG)
 860                 hwif->OUTB(drive->ctl | 2, IDE_CONTROL_REG);
 861         hwif->OUTB(speed, IDE_NSECTOR_REG);
 862         hwif->OUTB(SETFEATURES_XFER, IDE_FEATURE_REG);
 863         hwif->OUTB(WIN_SETFEATURES, IDE_COMMAND_REG);
 864         if ((IDE_CONTROL_REG) && (drive->quirk_list == 2))
 865                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
 866         udelay(1);
 867         /*
 868          * Wait for drive to become non-BUSY
 869          */
 870         if ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 871                 unsigned long flags, timeout;
 872                 local_irq_set(flags);
 873                 timeout = jiffies + WAIT_CMD;
 874                 while ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 875                         if (time_after(jiffies, timeout))
 876                                 break;
 877                 }
 878                 local_irq_restore(flags);
 879         }
 880
 881         /*
 882          * Allow status to settle, then read it again.
 883          * A few rare drives vastly violate the 400ns spec here,
 884          * so we'll wait up to 10usec for a "good" status
 885          * rather than expensively fail things immediately.
 886          * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 887          */
 888         for (i = 0; i < 10; i++) {
 889                 udelay(1);
 890                 if (OK_STAT((stat = hwif->INB(IDE_STATUS_REG)), DRIVE_READY, BUSY_STAT|DRQ_STAT|ERR_STAT)) {
 891                         error = 0;
 892                         break;
 893                 }
 894         }
 895
 896         SELECT_MASK(drive, 0);
 897
 898         enable_irq(hwif->irq);
 899
 900         if (error) {
 901                 (void) ide_dump_status(drive, "set_drive_speed_status", stat);
 902                 return error;
 903         }
 904
 905         drive->id->dma_ultra &= ~0xFF00;
 906         drive->id->dma_mword &= ~0x0F00;
 907         drive->id->dma_1word &= ~0x0F00;
 908
 909 #ifdef CONFIG_BLK_DEV_IDEDMA
 910         if (speed >= XFER_SW_DMA_0)
 911                 hwif->ide_dma_host_on(drive);
 912         else if (hwif->ide_dma_check)   /* check if host supports DMA */
 913                 hwif->ide_dma_off_quietly(drive);
 914 #endif
 915
 916         switch(speed) {
 917                 case XFER_UDMA_7:   drive->id->dma_ultra |= 0x8080; break;
 918                 case XFER_UDMA_6:   drive->id->dma_ultra |= 0x4040; break;
 919                 case XFER_UDMA_5:   drive->id->dma_ultra |= 0x2020; break;
 920                 case XFER_UDMA_4:   drive->id->dma_ultra |= 0x1010; break;
 921                 case XFER_UDMA_3:   drive->id->dma_ultra |= 0x0808; break;
 922                 case XFER_UDMA_2:   drive->id->dma_ultra |= 0x0404; break;
 923                 case XFER_UDMA_1:   drive->id->dma_ultra |= 0x0202; break;
 924                 case XFER_UDMA_0:   drive->id->dma_ultra |= 0x0101; break;
 925                 case XFER_MW_DMA_2: drive->id->dma_mword |= 0x0404; break;
 926                 case XFER_MW_DMA_1: drive->id->dma_mword |= 0x0202; break;
 927                 case XFER_MW_DMA_0: drive->id->dma_mword |= 0x0101; break;
 928                 case XFER_SW_DMA_2: drive->id->dma_1word |= 0x0404; break;
 929                 case XFER_SW_DMA_1: drive->id->dma_1word |= 0x0202; break;
 930                 case XFER_SW_DMA_0: drive->id->dma_1word |= 0x0101; break;
 931                 default: break;
 932         }
 933         if (!drive->init_speed)
 934                 drive->init_speed = speed;
 935         drive->current_speed = speed;
 936         return error;
 937 }
 938
 939 EXPORT_SYMBOL(ide_config_drive_speed);
 940
 941
 942 /*
 943  * This should get invoked any time we exit the driver to
 944  * wait for an interrupt response from a drive.  handler() points
 945  * at the appropriate code to handle the next interrupt, and a
 946  * timer is started to prevent us from waiting forever in case
 947  * something goes wrong (see the ide_timer_expiry() handler later on).
 948  *
 949  * See also ide_execute_command
 950  */
 951 void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 952                       unsigned int timeout, ide_expiry_t *expiry)
 953 {
 954         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 955
 956         if (hwgroup->handler != NULL) {
 957                 printk(KERN_CRIT "%s: ide_set_handler: handler not null; "
 958                         "old=%p, new=%p\n",
 959                         drive->name, hwgroup->handler, handler);
 960         }
 961         hwgroup->handler        = handler;
 962         hwgroup->expiry         = expiry;
 963         hwgroup->timer.expires  = jiffies + timeout;
 964         add_timer(&hwgroup->timer);
 965 }
 966
 967 EXPORT_SYMBOL(__ide_set_handler);
 968
 969 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 970                       unsigned int timeout, ide_expiry_t *expiry)
 971 {
 972         unsigned long flags;
 973         spin_lock_irqsave(&ide_lock, flags);
 974         __ide_set_handler(drive, handler, timeout, expiry);
 975         spin_unlock_irqrestore(&ide_lock, flags);
 976 }
 977
 978 EXPORT_SYMBOL(ide_set_handler);
 979
 980 /**
 981  *      ide_execute_command     -       execute an IDE command
 982  *      @drive: IDE drive to issue the command against
 983  *      @command: command byte to write
 984  *      @handler: handler for next phase
 985  *      @timeout: timeout for command
 986  *      @expiry:  handler to run on timeout
 987  *
 988  *      Helper function to issue an IDE command. This handles the
 989  *      atomicity requirements, command timing and ensures that the
 990  *      handler and IRQ setup do not race. All IDE command kick off
 991  *      should go via this function or do equivalent locking.
 992  */
 993
 994 void ide_execute_command(ide_drive_t *drive, task_ioreg_t cmd, ide_handler_t *handler, unsigned timeout, ide_expiry_t *expiry)
 995 {
 996         unsigned long flags;
 997         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 998         ide_hwif_t *hwif = HWIF(drive);
 999
1000         spin_lock_irqsave(&ide_lock, flags);
1001
1002         if(hwgroup->handler)
1003                 BUG();
1004         hwgroup->handler        = handler;
1005         hwgroup->expiry         = expiry;
1006         hwgroup->timer.expires  = jiffies + timeout;
1007         add_timer(&hwgroup->timer);
1008         hwif->OUTBSYNC(drive, cmd, IDE_COMMAND_REG);
1009         /* Drive takes 400nS to respond, we must avoid the IRQ being
1010            serviced before that.
1011
1012            FIXME: we could skip this delay with care on non shared
1013            devices
1014         */
1015         ndelay(400);
1016         spin_unlock_irqrestore(&ide_lock, flags);
1017 }
1018
1019 EXPORT_SYMBOL(ide_execute_command);
1020
1021
1022 /* needed below */
1023 static ide_startstop_t do_reset1 (ide_drive_t *, int);
1024
1025 /*
1026  * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
1027  * during an atapi drive reset operation. If the drive has not yet responded,
1028  * and we have not yet hit our maximum waiting time, then the timer is restarted
1029  * for another 50ms.
1030  */
1031 static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
1032 {
1033         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
1034         ide_hwif_t *hwif        = HWIF(drive);
1035         u8 stat;
1036
1037         SELECT_DRIVE(drive);
1038         udelay (10);
1039
1040         if (OK_STAT(stat = hwif->INB(IDE_STATUS_REG), 0, BUSY_STAT)) {
1041                 printk("%s: ATAPI reset complete\n", drive->name);
1042         } else {
1043                 if (time_before(jiffies, hwgroup->poll_timeout)) {
1044                         if (HWGROUP(drive)->handler != NULL)
1045                                 BUG();
1046                         ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1047                         /* continue polling */
1048                         return ide_started;
1049                 }
1050                 /* end of polling */
1051                 hwgroup->poll_timeout = 0;
1052                 printk("%s: ATAPI reset timed-out, status=0x%02x\n",
1053                                 drive->name, stat);
1054                 /* do it the old fashioned way */
1055                 return do_reset1(drive, 1);
1056         }
1057         /* done polling */
1058         hwgroup->poll_timeout = 0;
1059         return ide_stopped;
1060 }
1061
1062 /*
1063  * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
1064  * during an ide reset operation. If the drives have not yet responded,
1065  * and we have not yet hit our maximum waiting time, then the timer is restarted
1066  * for another 50ms.
1067  */
1068 static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
1069 {
1070         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
1071         ide_hwif_t *hwif        = HWIF(drive);
1072         u8 tmp;
1073
1074         if (hwif->reset_poll != NULL) {
1075                 if (hwif->reset_poll(drive)) {
1076                         printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
1077                                 hwif->name, drive->name);
1078                         return ide_stopped;
1079                 }
1080         }
1081
1082         if (!OK_STAT(tmp = hwif->INB(IDE_STATUS_REG), 0, BUSY_STAT)) {
1083                 if (time_before(jiffies, hwgroup->poll_timeout)) {
1084                         if (HWGROUP(drive)->handler != NULL)
1085                                 BUG();
1086                         ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1087                         /* continue polling */
1088                         return ide_started;
1089                 }
1090                 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
1091                 drive->failures++;
1092         } else  {
1093                 printk("%s: reset: ", hwif->name);
1094                 if ((tmp = hwif->INB(IDE_ERROR_REG)) == 1) {
1095                         printk("success\n");
1096                         drive->failures = 0;
1097                 } else {
1098                         drive->failures++;
1099 #if FANCY_STATUS_DUMPS
1100                         printk("master: ");
1101                         switch (tmp & 0x7f) {
1102                                 case 1: printk("passed");
1103                                         break;
1104                                 case 2: printk("formatter device error");
1105                                         break;
1106                                 case 3: printk("sector buffer error");
1107                                         break;
1108                                 case 4: printk("ECC circuitry error");
1109                                         break;
1110                                 case 5: printk("controlling MPU error");
1111                                         break;
1112                                 default:printk("error (0x%02x?)", tmp);
1113                         }
1114                         if (tmp & 0x80)
1115                                 printk("; slave: failed");
1116                         printk("\n");
1117 #else
1118                         printk("failed\n");
1119 #endif /* FANCY_STATUS_DUMPS */
1120                 }
1121         }
1122         hwgroup->poll_timeout = 0;      /* done polling */
1123         return ide_stopped;
1124 }
1125
1126 static void check_dma_crc(ide_drive_t *drive)
1127 {
1128 #ifdef CONFIG_BLK_DEV_IDEDMA
1129         if (drive->crc_count) {
1130                 (void) HWIF(drive)->ide_dma_off_quietly(drive);
1131                 ide_set_xfer_rate(drive, ide_auto_reduce_xfer(drive));
1132                 if (drive->current_speed >= XFER_SW_DMA_0)
1133                         (void) HWIF(drive)->ide_dma_on(drive);
1134         } else
1135                 (void)__ide_dma_off(drive);
1136 #endif
1137 }
1138
1139 void pre_reset (ide_drive_t *drive)
1140 {
1141         DRIVER(drive)->pre_reset(drive);
1142
1143         if (!drive->keep_settings) {
1144                 if (drive->using_dma) {
1145                         check_dma_crc(drive);
1146                 } else {
1147                         drive->unmask = 0;
1148                         drive->io_32bit = 0;
1149                 }
1150                 return;
1151         }
1152         if (drive->using_dma)
1153                 check_dma_crc(drive);
1154
1155         if (HWIF(drive)->pre_reset != NULL)
1156                 HWIF(drive)->pre_reset(drive);
1157
1158 }
1159
1160 /*
1161  * do_reset1() attempts to recover a confused drive by resetting it.
1162  * Unfortunately, resetting a disk drive actually resets all devices on
1163  * the same interface, so it can really be thought of as resetting the
1164  * interface rather than resetting the drive.
1165  *
1166  * ATAPI devices have their own reset mechanism which allows them to be
1167  * individually reset without clobbering other devices on the same interface.
1168  *
1169  * Unfortunately, the IDE interface does not generate an interrupt to let
1170  * us know when the reset operation has finished, so we must poll for this.
1171  * Equally poor, though, is the fact that this may a very long time to complete,
1172  * (up to 30 seconds worstcase).  So, instead of busy-waiting here for it,
1173  * we set a timer to poll at 50ms intervals.
1174  */
1175 static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
1176 {
1177         unsigned int unit;
1178         unsigned long flags;
1179         ide_hwif_t *hwif;
1180         ide_hwgroup_t *hwgroup;
1181
1182         spin_lock_irqsave(&ide_lock, flags);
1183         hwif = HWIF(drive);
1184         hwgroup = HWGROUP(drive);
1185
1186         /* We must not reset with running handlers */
1187         if(hwgroup->handler != NULL)
1188                 BUG();
1189
1190         /* For an ATAPI device, first try an ATAPI SRST. */
1191         if (drive->media != ide_disk && !do_not_try_atapi) {
1192                 pre_reset(drive);
1193                 SELECT_DRIVE(drive);
1194                 udelay (20);
1195                 hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
1196                 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1197                 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1198                 spin_unlock_irqrestore(&ide_lock, flags);
1199                 return ide_started;
1200         }
1201
1202         /*
1203          * First, reset any device state data we were maintaining
1204          * for any of the drives on this interface.
1205          */
1206         for (unit = 0; unit < MAX_DRIVES; ++unit)
1207                 pre_reset(&hwif->drives[unit]);
1208
1209 #if OK_TO_RESET_CONTROLLER
1210         if (!IDE_CONTROL_REG) {
1211                 spin_unlock_irqrestore(&ide_lock, flags);
1212                 return ide_stopped;
1213         }
1214
1215         /*
1216          * Note that we also set nIEN while resetting the device,
1217          * to mask unwanted interrupts from the interface during the reset.
1218          * However, due to the design of PC hardware, this will cause an
1219          * immediate interrupt due to the edge transition it produces.
1220          * This single interrupt gives us a "fast poll" for drives that
1221          * recover from reset very quickly, saving us the first 50ms wait time.
1222          */
1223         /* set SRST and nIEN */
1224         hwif->OUTBSYNC(drive, drive->ctl|6,IDE_CONTROL_REG);
1225         /* more than enough time */
1226         udelay(10);
1227         if (drive->quirk_list == 2) {
1228                 /* clear SRST and nIEN */
1229                 hwif->OUTBSYNC(drive, drive->ctl, IDE_CONTROL_REG);
1230         } else {
1231                 /* clear SRST, leave nIEN */
1232                 hwif->OUTBSYNC(drive, drive->ctl|2, IDE_CONTROL_REG);
1233         }
1234         /* more than enough time */
1235         udelay(10);
1236         hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1237         __ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1238
1239         /*
1240          * Some weird controller like resetting themselves to a strange
1241          * state when the disks are reset this way. At least, the Winbond
1242          * 553 documentation says that
1243          */
1244         if (hwif->resetproc != NULL) {
1245                 hwif->resetproc(drive);
1246         }
1247
1248 #endif  /* OK_TO_RESET_CONTROLLER */
1249
1250         spin_unlock_irqrestore(&ide_lock, flags);
1251         return ide_started;
1252 }
1253
1254 /*
1255  * ide_do_reset() is the entry point to the drive/interface reset code.
1256  */
1257
1258 ide_startstop_t ide_do_reset (ide_drive_t *drive)
1259 {
1260         return do_reset1(drive, 0);
1261 }
1262
1263 EXPORT_SYMBOL(ide_do_reset);
1264
1265 /*
1266  * ide_wait_not_busy() waits for the currently selected device on the hwif
1267  * to report a non-busy status, see comments in probe_hwif().
1268  */
1269 int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
1270 {
1271         u8 stat = 0;
1272
1273         while(timeout--) {
1274                 /*
1275                  * Turn this into a schedule() sleep once I'm sure
1276                  * about locking issues (2.5 work ?).
1277                  */
1278                 mdelay(1);
1279                 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
1280                 if ((stat & BUSY_STAT) == 0)
1281                         return 0;
1282                 /*
1283                  * Assume a value of 0xff means nothing is connected to
1284                  * the interface and it doesn't implement the pull-down
1285                  * resistor on D7.
1286                  */
1287                 if (stat == 0xff)
1288                         return -ENODEV;
1289         }
1290         return -EBUSY;
1291 }
1292
1293 EXPORT_SYMBOL_GPL(ide_wait_not_busy);
1294