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 #include <linux/nmi.h>
  27
  28 #include <asm/byteorder.h>
  29 #include <asm/irq.h>
  30 #include <asm/uaccess.h>
  31 #include <asm/io.h>
  32
  33 /*
  34  *      Conventional PIO operations for ATA devices
  35  */
  36
  37 static u8 ide_inb (unsigned long port)
  38 {
  39         return (u8) inb(port);
  40 }
  41
  42 static u16 ide_inw (unsigned long port)
  43 {
  44         return (u16) inw(port);
  45 }
  46
  47 static void ide_insw (unsigned long port, void *addr, u32 count)
  48 {
  49         insw(port, addr, count);
  50 }
  51
  52 static void ide_insl (unsigned long port, void *addr, u32 count)
  53 {
  54         insl(port, addr, count);
  55 }
  56
  57 static void ide_outb (u8 val, unsigned long port)
  58 {
  59         outb(val, port);
  60 }
  61
  62 static void ide_outbsync (ide_drive_t *drive, u8 addr, unsigned long port)
  63 {
  64         outb(addr, port);
  65 }
  66
  67 static void ide_outw (u16 val, unsigned long port)
  68 {
  69         outw(val, port);
  70 }
  71
  72 static void ide_outsw (unsigned long port, void *addr, u32 count)
  73 {
  74         outsw(port, addr, count);
  75 }
  76
  77 static void ide_outsl (unsigned long port, void *addr, u32 count)
  78 {
  79         outsl(port, addr, count);
  80 }
  81
  82 void default_hwif_iops (ide_hwif_t *hwif)
  83 {
  84         hwif->OUTB      = ide_outb;
  85         hwif->OUTBSYNC  = ide_outbsync;
  86         hwif->OUTW      = ide_outw;
  87         hwif->OUTSW     = ide_outsw;
  88         hwif->OUTSL     = ide_outsl;
  89         hwif->INB       = ide_inb;
  90         hwif->INW       = ide_inw;
  91         hwif->INSW      = ide_insw;
  92         hwif->INSL      = ide_insl;
  93 }
  94
  95 /*
  96  *      MMIO operations, typically used for SATA controllers
  97  */
  98
  99 static u8 ide_mm_inb (unsigned long port)
 100 {
 101         return (u8) readb((void __iomem *) port);
 102 }
 103
 104 static u16 ide_mm_inw (unsigned long port)
 105 {
 106         return (u16) readw((void __iomem *) port);
 107 }
 108
 109 static void ide_mm_insw (unsigned long port, void *addr, u32 count)
 110 {
 111         __ide_mm_insw((void __iomem *) port, addr, count);
 112 }
 113
 114 static void ide_mm_insl (unsigned long port, void *addr, u32 count)
 115 {
 116         __ide_mm_insl((void __iomem *) port, addr, count);
 117 }
 118
 119 static void ide_mm_outb (u8 value, unsigned long port)
 120 {
 121         writeb(value, (void __iomem *) port);
 122 }
 123
 124 static void ide_mm_outbsync (ide_drive_t *drive, u8 value, unsigned long port)
 125 {
 126         writeb(value, (void __iomem *) port);
 127 }
 128
 129 static void ide_mm_outw (u16 value, unsigned long port)
 130 {
 131         writew(value, (void __iomem *) port);
 132 }
 133
 134 static void ide_mm_outsw (unsigned long port, void *addr, u32 count)
 135 {
 136         __ide_mm_outsw((void __iomem *) port, addr, count);
 137 }
 138
 139 static void ide_mm_outsl (unsigned long port, void *addr, u32 count)
 140 {
 141         __ide_mm_outsl((void __iomem *) port, addr, count);
 142 }
 143
 144 void default_hwif_mmiops (ide_hwif_t *hwif)
 145 {
 146         hwif->OUTB      = ide_mm_outb;
 147         /* Most systems will need to override OUTBSYNC, alas however
 148            this one is controller specific! */
 149         hwif->OUTBSYNC  = ide_mm_outbsync;
 150         hwif->OUTW      = ide_mm_outw;
 151         hwif->OUTSW     = ide_mm_outsw;
 152         hwif->OUTSL     = ide_mm_outsl;
 153         hwif->INB       = ide_mm_inb;
 154         hwif->INW       = ide_mm_inw;
 155         hwif->INSW      = ide_mm_insw;
 156         hwif->INSL      = ide_mm_insl;
 157 }
 158
 159 EXPORT_SYMBOL(default_hwif_mmiops);
 160
 161 u32 ide_read_24 (ide_drive_t *drive)
 162 {
 163         u8 hcyl = HWIF(drive)->INB(IDE_HCYL_REG);
 164         u8 lcyl = HWIF(drive)->INB(IDE_LCYL_REG);
 165         u8 sect = HWIF(drive)->INB(IDE_SECTOR_REG);
 166         return (hcyl<<16)|(lcyl<<8)|sect;
 167 }
 168
 169 void SELECT_DRIVE (ide_drive_t *drive)
 170 {
 171         if (HWIF(drive)->selectproc)
 172                 HWIF(drive)->selectproc(drive);
 173         HWIF(drive)->OUTB(drive->select.all, IDE_SELECT_REG);
 174 }
 175
 176 EXPORT_SYMBOL(SELECT_DRIVE);
 177
 178 void SELECT_INTERRUPT (ide_drive_t *drive)
 179 {
 180         if (HWIF(drive)->intrproc)
 181                 HWIF(drive)->intrproc(drive);
 182         else
 183                 HWIF(drive)->OUTB(drive->ctl|2, IDE_CONTROL_REG);
 184 }
 185
 186 void SELECT_MASK (ide_drive_t *drive, int mask)
 187 {
 188         if (HWIF(drive)->maskproc)
 189                 HWIF(drive)->maskproc(drive, mask);
 190 }
 191
 192 void QUIRK_LIST (ide_drive_t *drive)
 193 {
 194         if (HWIF(drive)->quirkproc)
 195                 drive->quirk_list = HWIF(drive)->quirkproc(drive);
 196 }
 197
 198 /*
 199  * Some localbus EIDE interfaces require a special access sequence
 200  * when using 32-bit I/O instructions to transfer data.  We call this
 201  * the "vlb_sync" sequence, which consists of three successive reads
 202  * of the sector count register location, with interrupts disabled
 203  * to ensure that the reads all happen together.
 204  */
 205 static void ata_vlb_sync(ide_drive_t *drive, unsigned long port)
 206 {
 207         (void) HWIF(drive)->INB(port);
 208         (void) HWIF(drive)->INB(port);
 209         (void) HWIF(drive)->INB(port);
 210 }
 211
 212 /*
 213  * This is used for most PIO data transfers *from* the IDE interface
 214  */
 215 static void ata_input_data(ide_drive_t *drive, void *buffer, u32 wcount)
 216 {
 217         ide_hwif_t *hwif        = HWIF(drive);
 218         u8 io_32bit             = drive->io_32bit;
 219
 220         if (io_32bit) {
 221                 if (io_32bit & 2) {
 222                         unsigned long flags;
 223                         local_irq_save(flags);
 224                         ata_vlb_sync(drive, IDE_NSECTOR_REG);
 225                         hwif->INSL(IDE_DATA_REG, buffer, wcount);
 226                         local_irq_restore(flags);
 227                 } else
 228                         hwif->INSL(IDE_DATA_REG, buffer, wcount);
 229         } else {
 230                 hwif->INSW(IDE_DATA_REG, buffer, wcount<<1);
 231         }
 232 }
 233
 234 /*
 235  * This is used for most PIO data transfers *to* the IDE interface
 236  */
 237 static void ata_output_data(ide_drive_t *drive, void *buffer, u32 wcount)
 238 {
 239         ide_hwif_t *hwif        = HWIF(drive);
 240         u8 io_32bit             = drive->io_32bit;
 241
 242         if (io_32bit) {
 243                 if (io_32bit & 2) {
 244                         unsigned long flags;
 245                         local_irq_save(flags);
 246                         ata_vlb_sync(drive, IDE_NSECTOR_REG);
 247                         hwif->OUTSL(IDE_DATA_REG, buffer, wcount);
 248                         local_irq_restore(flags);
 249                 } else
 250                         hwif->OUTSL(IDE_DATA_REG, buffer, wcount);
 251         } else {
 252                 hwif->OUTSW(IDE_DATA_REG, buffer, wcount<<1);
 253         }
 254 }
 255
 256 /*
 257  * The following routines are mainly used by the ATAPI drivers.
 258  *
 259  * These routines will round up any request for an odd number of bytes,
 260  * so if an odd bytecount is specified, be sure that there's at least one
 261  * extra byte allocated for the buffer.
 262  */
 263
 264 static void atapi_input_bytes(ide_drive_t *drive, void *buffer, u32 bytecount)
 265 {
 266         ide_hwif_t *hwif = HWIF(drive);
 267
 268         ++bytecount;
 269 #if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
 270         if (MACH_IS_ATARI || MACH_IS_Q40) {
 271                 /* Atari has a byte-swapped IDE interface */
 272                 insw_swapw(IDE_DATA_REG, buffer, bytecount / 2);
 273                 return;
 274         }
 275 #endif /* CONFIG_ATARI || CONFIG_Q40 */
 276         hwif->ata_input_data(drive, buffer, bytecount / 4);
 277         if ((bytecount & 0x03) >= 2)
 278                 hwif->INSW(IDE_DATA_REG, ((u8 *)buffer)+(bytecount & ~0x03), 1);
 279 }
 280
 281 static void atapi_output_bytes(ide_drive_t *drive, void *buffer, u32 bytecount)
 282 {
 283         ide_hwif_t *hwif = HWIF(drive);
 284
 285         ++bytecount;
 286 #if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
 287         if (MACH_IS_ATARI || MACH_IS_Q40) {
 288                 /* Atari has a byte-swapped IDE interface */
 289                 outsw_swapw(IDE_DATA_REG, buffer, bytecount / 2);
 290                 return;
 291         }
 292 #endif /* CONFIG_ATARI || CONFIG_Q40 */
 293         hwif->ata_output_data(drive, buffer, bytecount / 4);
 294         if ((bytecount & 0x03) >= 2)
 295                 hwif->OUTSW(IDE_DATA_REG, ((u8*)buffer)+(bytecount & ~0x03), 1);
 296 }
 297
 298 void default_hwif_transport(ide_hwif_t *hwif)
 299 {
 300         hwif->ata_input_data            = ata_input_data;
 301         hwif->ata_output_data           = ata_output_data;
 302         hwif->atapi_input_bytes         = atapi_input_bytes;
 303         hwif->atapi_output_bytes        = atapi_output_bytes;
 304 }
 305
 306 /*
 307  * Beginning of Taskfile OPCODE Library and feature sets.
 308  */
 309 void ide_fix_driveid (struct hd_driveid *id)
 310 {
 311 #ifndef __LITTLE_ENDIAN
 312 # ifdef __BIG_ENDIAN
 313         int i;
 314         u16 *stringcast;
 315
 316         id->config         = __le16_to_cpu(id->config);
 317         id->cyls           = __le16_to_cpu(id->cyls);
 318         id->reserved2      = __le16_to_cpu(id->reserved2);
 319         id->heads          = __le16_to_cpu(id->heads);
 320         id->track_bytes    = __le16_to_cpu(id->track_bytes);
 321         id->sector_bytes   = __le16_to_cpu(id->sector_bytes);
 322         id->sectors        = __le16_to_cpu(id->sectors);
 323         id->vendor0        = __le16_to_cpu(id->vendor0);
 324         id->vendor1        = __le16_to_cpu(id->vendor1);
 325         id->vendor2        = __le16_to_cpu(id->vendor2);
 326         stringcast = (u16 *)&id->serial_no[0];
 327         for (i = 0; i < (20/2); i++)
 328                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 329         id->buf_type       = __le16_to_cpu(id->buf_type);
 330         id->buf_size       = __le16_to_cpu(id->buf_size);
 331         id->ecc_bytes      = __le16_to_cpu(id->ecc_bytes);
 332         stringcast = (u16 *)&id->fw_rev[0];
 333         for (i = 0; i < (8/2); i++)
 334                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 335         stringcast = (u16 *)&id->model[0];
 336         for (i = 0; i < (40/2); i++)
 337                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 338         id->dword_io       = __le16_to_cpu(id->dword_io);
 339         id->reserved50     = __le16_to_cpu(id->reserved50);
 340         id->field_valid    = __le16_to_cpu(id->field_valid);
 341         id->cur_cyls       = __le16_to_cpu(id->cur_cyls);
 342         id->cur_heads      = __le16_to_cpu(id->cur_heads);
 343         id->cur_sectors    = __le16_to_cpu(id->cur_sectors);
 344         id->cur_capacity0  = __le16_to_cpu(id->cur_capacity0);
 345         id->cur_capacity1  = __le16_to_cpu(id->cur_capacity1);
 346         id->lba_capacity   = __le32_to_cpu(id->lba_capacity);
 347         id->dma_1word      = __le16_to_cpu(id->dma_1word);
 348         id->dma_mword      = __le16_to_cpu(id->dma_mword);
 349         id->eide_pio_modes = __le16_to_cpu(id->eide_pio_modes);
 350         id->eide_dma_min   = __le16_to_cpu(id->eide_dma_min);
 351         id->eide_dma_time  = __le16_to_cpu(id->eide_dma_time);
 352         id->eide_pio       = __le16_to_cpu(id->eide_pio);
 353         id->eide_pio_iordy = __le16_to_cpu(id->eide_pio_iordy);
 354         for (i = 0; i < 2; ++i)
 355                 id->words69_70[i] = __le16_to_cpu(id->words69_70[i]);
 356         for (i = 0; i < 4; ++i)
 357                 id->words71_74[i] = __le16_to_cpu(id->words71_74[i]);
 358         id->queue_depth    = __le16_to_cpu(id->queue_depth);
 359         for (i = 0; i < 4; ++i)
 360                 id->words76_79[i] = __le16_to_cpu(id->words76_79[i]);
 361         id->major_rev_num  = __le16_to_cpu(id->major_rev_num);
 362         id->minor_rev_num  = __le16_to_cpu(id->minor_rev_num);
 363         id->command_set_1  = __le16_to_cpu(id->command_set_1);
 364         id->command_set_2  = __le16_to_cpu(id->command_set_2);
 365         id->cfsse          = __le16_to_cpu(id->cfsse);
 366         id->cfs_enable_1   = __le16_to_cpu(id->cfs_enable_1);
 367         id->cfs_enable_2   = __le16_to_cpu(id->cfs_enable_2);
 368         id->csf_default    = __le16_to_cpu(id->csf_default);
 369         id->dma_ultra      = __le16_to_cpu(id->dma_ultra);
 370         id->trseuc         = __le16_to_cpu(id->trseuc);
 371         id->trsEuc         = __le16_to_cpu(id->trsEuc);
 372         id->CurAPMvalues   = __le16_to_cpu(id->CurAPMvalues);
 373         id->mprc           = __le16_to_cpu(id->mprc);
 374         id->hw_config      = __le16_to_cpu(id->hw_config);
 375         id->acoustic       = __le16_to_cpu(id->acoustic);
 376         id->msrqs          = __le16_to_cpu(id->msrqs);
 377         id->sxfert         = __le16_to_cpu(id->sxfert);
 378         id->sal            = __le16_to_cpu(id->sal);
 379         id->spg            = __le32_to_cpu(id->spg);
 380         id->lba_capacity_2 = __le64_to_cpu(id->lba_capacity_2);
 381         for (i = 0; i < 22; i++)
 382                 id->words104_125[i]   = __le16_to_cpu(id->words104_125[i]);
 383         id->last_lun       = __le16_to_cpu(id->last_lun);
 384         id->word127        = __le16_to_cpu(id->word127);
 385         id->dlf            = __le16_to_cpu(id->dlf);
 386         id->csfo           = __le16_to_cpu(id->csfo);
 387         for (i = 0; i < 26; i++)
 388                 id->words130_155[i] = __le16_to_cpu(id->words130_155[i]);
 389         id->word156        = __le16_to_cpu(id->word156);
 390         for (i = 0; i < 3; i++)
 391                 id->words157_159[i] = __le16_to_cpu(id->words157_159[i]);
 392         id->cfa_power      = __le16_to_cpu(id->cfa_power);
 393         for (i = 0; i < 14; i++)
 394                 id->words161_175[i] = __le16_to_cpu(id->words161_175[i]);
 395         for (i = 0; i < 31; i++)
 396                 id->words176_205[i] = __le16_to_cpu(id->words176_205[i]);
 397         for (i = 0; i < 48; i++)
 398                 id->words206_254[i] = __le16_to_cpu(id->words206_254[i]);
 399         id->integrity_word  = __le16_to_cpu(id->integrity_word);
 400 # else
 401 #  error "Please fix <asm/byteorder.h>"
 402 # endif
 403 #endif
 404 }
 405
 406 /* FIXME: exported for use by the USB storage (isd200.c) code only */
 407 EXPORT_SYMBOL(ide_fix_driveid);
 408
 409 void ide_fixstring (u8 *s, const int bytecount, const int byteswap)
 410 {
 411         u8 *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
 412
 413         if (byteswap) {
 414                 /* convert from big-endian to host byte order */
 415                 for (p = end ; p != s;) {
 416                         unsigned short *pp = (unsigned short *) (p -= 2);
 417                         *pp = ntohs(*pp);
 418                 }
 419         }
 420         /* strip leading blanks */
 421         while (s != end && *s == ' ')
 422                 ++s;
 423         /* compress internal blanks and strip trailing blanks */
 424         while (s != end && *s) {
 425                 if (*s++ != ' ' || (s != end && *s && *s != ' '))
 426                         *p++ = *(s-1);
 427         }
 428         /* wipe out trailing garbage */
 429         while (p != end)
 430                 *p++ = '\0';
 431 }
 432
 433 EXPORT_SYMBOL(ide_fixstring);
 434
 435 /*
 436  * Needed for PCI irq sharing
 437  */
 438 int drive_is_ready (ide_drive_t *drive)
 439 {
 440         ide_hwif_t *hwif        = HWIF(drive);
 441         u8 stat                 = 0;
 442
 443         if (drive->waiting_for_dma)
 444                 return hwif->ide_dma_test_irq(drive);
 445
 446 #if 0
 447         /* need to guarantee 400ns since last command was issued */
 448         udelay(1);
 449 #endif
 450
 451 #ifdef CONFIG_IDEPCI_SHARE_IRQ
 452         /*
 453          * We do a passive status test under shared PCI interrupts on
 454          * cards that truly share the ATA side interrupt, but may also share
 455          * an interrupt with another pci card/device.  We make no assumptions
 456          * about possible isa-pnp and pci-pnp issues yet.
 457          */
 458         if (IDE_CONTROL_REG)
 459                 stat = hwif->INB(IDE_ALTSTATUS_REG);
 460         else
 461 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
 462                 /* Note: this may clear a pending IRQ!! */
 463                 stat = hwif->INB(IDE_STATUS_REG);
 464
 465         if (stat & BUSY_STAT)
 466                 /* drive busy:  definitely not interrupting */
 467                 return 0;
 468
 469         /* drive ready: *might* be interrupting */
 470         return 1;
 471 }
 472
 473 EXPORT_SYMBOL(drive_is_ready);
 474
 475 /*
 476  * Global for All, and taken from ide-pmac.c. Can be called
 477  * with spinlock held & IRQs disabled, so don't schedule !
 478  */
 479 int wait_for_ready (ide_drive_t *drive, int timeout)
 480 {
 481         ide_hwif_t *hwif        = HWIF(drive);
 482         u8 stat                 = 0;
 483
 484         while(--timeout) {
 485                 stat = hwif->INB(IDE_STATUS_REG);
 486                 if (!(stat & BUSY_STAT)) {
 487                         if (drive->ready_stat == 0)
 488                                 break;
 489                         else if ((stat & drive->ready_stat)||(stat & ERR_STAT))
 490                                 break;
 491                 }
 492                 mdelay(1);
 493         }
 494         if ((stat & ERR_STAT) || timeout <= 0) {
 495                 if (stat & ERR_STAT) {
 496                         printk(KERN_ERR "%s: wait_for_ready, "
 497                                 "error status: %x\n", drive->name, stat);
 498                 }
 499                 return 1;
 500         }
 501         return 0;
 502 }
 503
 504 /*
 505  * This routine busy-waits for the drive status to be not "busy".
 506  * It then checks the status for all of the "good" bits and none
 507  * of the "bad" bits, and if all is okay it returns 0.  All other
 508  * cases return 1 after invoking ide_error() -- caller should just return.
 509  *
 510  * This routine should get fixed to not hog the cpu during extra long waits..
 511  * That could be done by busy-waiting for the first jiffy or two, and then
 512  * setting a timer to wake up at half second intervals thereafter,
 513  * until timeout is achieved, before timing out.
 514  */
 515 int ide_wait_stat (ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout)
 516 {
 517         ide_hwif_t *hwif = HWIF(drive);
 518         u8 stat;
 519         int i;
 520         unsigned long flags;
 521
 522         /* bail early if we've exceeded max_failures */
 523         if (drive->max_failures && (drive->failures > drive->max_failures)) {
 524                 *startstop = ide_stopped;
 525                 return 1;
 526         }
 527
 528         udelay(1);      /* spec allows drive 400ns to assert "BUSY" */
 529         if ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 530                 local_irq_set(flags);
 531                 timeout += jiffies;
 532                 while ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 533                         if (time_after(jiffies, timeout)) {
 534                                 /*
 535                                  * One last read after the timeout in case
 536                                  * heavy interrupt load made us not make any
 537                                  * progress during the timeout..
 538                                  */
 539                                 stat = hwif->INB(IDE_STATUS_REG);
 540                                 if (!(stat & BUSY_STAT))
 541                                         break;
 542
 543                                 local_irq_restore(flags);
 544                                 *startstop = ide_error(drive, "status timeout", stat);
 545                                 return 1;
 546                         }
 547                 }
 548                 local_irq_restore(flags);
 549         }
 550         /*
 551          * Allow status to settle, then read it again.
 552          * A few rare drives vastly violate the 400ns spec here,
 553          * so we'll wait up to 10usec for a "good" status
 554          * rather than expensively fail things immediately.
 555          * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 556          */
 557         for (i = 0; i < 10; i++) {
 558                 udelay(1);
 559                 if (OK_STAT((stat = hwif->INB(IDE_STATUS_REG)), good, bad))
 560                         return 0;
 561         }
 562         *startstop = ide_error(drive, "status error", stat);
 563         return 1;
 564 }
 565
 566 EXPORT_SYMBOL(ide_wait_stat);
 567
 568 /*
 569  *  All hosts that use the 80c ribbon must use!
 570  *  The name is derived from upper byte of word 93 and the 80c ribbon.
 571  */
 572 u8 eighty_ninty_three (ide_drive_t *drive)
 573 {
 574         if(HWIF(drive)->udma_four == 0)
 575                 return 0;
 576
 577         /* Check for SATA but only if we are ATA5 or higher */
 578         if (drive->id->hw_config == 0 && (drive->id->major_rev_num & 0x7FE0))
 579                 return 1;
 580         if (!(drive->id->hw_config & 0x6000))
 581                 return 0;
 582 #ifndef CONFIG_IDEDMA_IVB
 583         if(!(drive->id->hw_config & 0x4000))
 584                 return 0;
 585 #endif /* CONFIG_IDEDMA_IVB */
 586         /*
 587          * FIXME:
 588          * - change master/slave IDENTIFY order
 589          * - force bit13 (80c cable present) check
 590          *   (unless the slave device is pre-ATA3)
 591          */
 592         return 1;
 593 }
 594
 595 EXPORT_SYMBOL(eighty_ninty_three);
 596
 597 int ide_ata66_check (ide_drive_t *drive, ide_task_t *args)
 598 {
 599         if ((args->tfRegister[IDE_COMMAND_OFFSET] == WIN_SETFEATURES) &&
 600             (args->tfRegister[IDE_SECTOR_OFFSET] > XFER_UDMA_2) &&
 601             (args->tfRegister[IDE_FEATURE_OFFSET] == SETFEATURES_XFER)) {
 602 #ifndef CONFIG_IDEDMA_IVB
 603                 if ((drive->id->hw_config & 0x6000) == 0) {
 604 #else /* !CONFIG_IDEDMA_IVB */
 605                 if (((drive->id->hw_config & 0x2000) == 0) ||
 606                     ((drive->id->hw_config & 0x4000) == 0)) {
 607 #endif /* CONFIG_IDEDMA_IVB */
 608                         printk("%s: Speed warnings UDMA 3/4/5 is not "
 609                                 "functional.\n", drive->name);
 610                         return 1;
 611                 }
 612                 if (!HWIF(drive)->udma_four) {
 613                         printk("%s: Speed warnings UDMA 3/4/5 is not "
 614                                 "functional.\n",
 615                                 HWIF(drive)->name);
 616                         return 1;
 617                 }
 618         }
 619         return 0;
 620 }
 621
 622 /*
 623  * Backside of HDIO_DRIVE_CMD call of SETFEATURES_XFER.
 624  * 1 : Safe to update drive->id DMA registers.
 625  * 0 : OOPs not allowed.
 626  */
 627 int set_transfer (ide_drive_t *drive, ide_task_t *args)
 628 {
 629         if ((args->tfRegister[IDE_COMMAND_OFFSET] == WIN_SETFEATURES) &&
 630             (args->tfRegister[IDE_SECTOR_OFFSET] >= XFER_SW_DMA_0) &&
 631             (args->tfRegister[IDE_FEATURE_OFFSET] == SETFEATURES_XFER) &&
 632             (drive->id->dma_ultra ||
 633              drive->id->dma_mword ||
 634              drive->id->dma_1word))
 635                 return 1;
 636
 637         return 0;
 638 }
 639
 640 #ifdef CONFIG_BLK_DEV_IDEDMA
 641 static u8 ide_auto_reduce_xfer (ide_drive_t *drive)
 642 {
 643         if (!drive->crc_count)
 644                 return drive->current_speed;
 645         drive->crc_count = 0;
 646
 647         switch(drive->current_speed) {
 648                 case XFER_UDMA_7:       return XFER_UDMA_6;
 649                 case XFER_UDMA_6:       return XFER_UDMA_5;
 650                 case XFER_UDMA_5:       return XFER_UDMA_4;
 651                 case XFER_UDMA_4:       return XFER_UDMA_3;
 652                 case XFER_UDMA_3:       return XFER_UDMA_2;
 653                 case XFER_UDMA_2:       return XFER_UDMA_1;
 654                 case XFER_UDMA_1:       return XFER_UDMA_0;
 655                         /*
 656                          * OOPS we do not goto non Ultra DMA modes
 657                          * without iCRC's available we force
 658                          * the system to PIO and make the user
 659                          * invoke the ATA-1 ATA-2 DMA modes.
 660                          */
 661                 case XFER_UDMA_0:
 662                 default:                return XFER_PIO_4;
 663         }
 664 }
 665 #endif /* CONFIG_BLK_DEV_IDEDMA */
 666
 667 /*
 668  * Update the
 669  */
 670 int ide_driveid_update (ide_drive_t *drive)
 671 {
 672         ide_hwif_t *hwif        = HWIF(drive);
 673         struct hd_driveid *id;
 674 #if 0
 675         id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
 676         if (!id)
 677                 return 0;
 678
 679         taskfile_lib_get_identify(drive, (char *)&id);
 680
 681         ide_fix_driveid(id);
 682         if (id) {
 683                 drive->id->dma_ultra = id->dma_ultra;
 684                 drive->id->dma_mword = id->dma_mword;
 685                 drive->id->dma_1word = id->dma_1word;
 686                 /* anything more ? */
 687                 kfree(id);
 688         }
 689         return 1;
 690 #else
 691         /*
 692          * Re-read drive->id for possible DMA mode
 693          * change (copied from ide-probe.c)
 694          */
 695         unsigned long timeout, flags;
 696
 697         SELECT_MASK(drive, 1);
 698         if (IDE_CONTROL_REG)
 699                 hwif->OUTB(drive->ctl,IDE_CONTROL_REG);
 700         msleep(50);
 701         hwif->OUTB(WIN_IDENTIFY, IDE_COMMAND_REG);
 702         timeout = jiffies + WAIT_WORSTCASE;
 703         do {
 704                 if (time_after(jiffies, timeout)) {
 705                         SELECT_MASK(drive, 0);
 706                         return 0;       /* drive timed-out */
 707                 }
 708                 msleep(50);     /* give drive a breather */
 709         } while (hwif->INB(IDE_ALTSTATUS_REG) & BUSY_STAT);
 710         msleep(50);     /* wait for IRQ and DRQ_STAT */
 711         if (!OK_STAT(hwif->INB(IDE_STATUS_REG),DRQ_STAT,BAD_R_STAT)) {
 712                 SELECT_MASK(drive, 0);
 713                 printk("%s: CHECK for good STATUS\n", drive->name);
 714                 return 0;
 715         }
 716         local_irq_save(flags);
 717         SELECT_MASK(drive, 0);
 718         id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
 719         if (!id) {
 720                 local_irq_restore(flags);
 721                 return 0;
 722         }
 723         ata_input_data(drive, id, SECTOR_WORDS);
 724         (void) hwif->INB(IDE_STATUS_REG);       /* clear drive IRQ */
 725         local_irq_enable();
 726         local_irq_restore(flags);
 727         ide_fix_driveid(id);
 728         if (id) {
 729                 drive->id->dma_ultra = id->dma_ultra;
 730                 drive->id->dma_mword = id->dma_mword;
 731                 drive->id->dma_1word = id->dma_1word;
 732                 /* anything more ? */
 733                 kfree(id);
 734         }
 735
 736         return 1;
 737 #endif
 738 }
 739
 740 /*
 741  * Similar to ide_wait_stat(), except it never calls ide_error internally.
 742  * This is a kludge to handle the new ide_config_drive_speed() function,
 743  * and should not otherwise be used anywhere.  Eventually, the tuneproc's
 744  * should be updated to return ide_startstop_t, in which case we can get
 745  * rid of this abomination again.  :)   -ml
 746  *
 747  * It is gone..........
 748  *
 749  * const char *msg == consider adding for verbose errors.
 750  */
 751 int ide_config_drive_speed (ide_drive_t *drive, u8 speed)
 752 {
 753         ide_hwif_t *hwif        = HWIF(drive);
 754         int     i, error        = 1;
 755         u8 stat;
 756
 757 //      while (HWGROUP(drive)->busy)
 758 //              msleep(50);
 759
 760 #ifdef CONFIG_BLK_DEV_IDEDMA
 761         if (hwif->ide_dma_check)         /* check if host supports DMA */
 762                 hwif->dma_host_off(drive);
 763 #endif
 764
 765         /*
 766          * Don't use ide_wait_cmd here - it will
 767          * attempt to set_geometry and recalibrate,
 768          * but for some reason these don't work at
 769          * this point (lost interrupt).
 770          */
 771         /*
 772          * Select the drive, and issue the SETFEATURES command
 773          */
 774         disable_irq_nosync(hwif->irq);
 775
 776         /*
 777          *      FIXME: we race against the running IRQ here if
 778          *      this is called from non IRQ context. If we use
 779          *      disable_irq() we hang on the error path. Work
 780          *      is needed.
 781          */
 782
 783         udelay(1);
 784         SELECT_DRIVE(drive);
 785         SELECT_MASK(drive, 0);
 786         udelay(1);
 787         if (IDE_CONTROL_REG)
 788                 hwif->OUTB(drive->ctl | 2, IDE_CONTROL_REG);
 789         hwif->OUTB(speed, IDE_NSECTOR_REG);
 790         hwif->OUTB(SETFEATURES_XFER, IDE_FEATURE_REG);
 791         hwif->OUTB(WIN_SETFEATURES, IDE_COMMAND_REG);
 792         if ((IDE_CONTROL_REG) && (drive->quirk_list == 2))
 793                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
 794         udelay(1);
 795         /*
 796          * Wait for drive to become non-BUSY
 797          */
 798         if ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 799                 unsigned long flags, timeout;
 800                 local_irq_set(flags);
 801                 timeout = jiffies + WAIT_CMD;
 802                 while ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 803                         if (time_after(jiffies, timeout))
 804                                 break;
 805                 }
 806                 local_irq_restore(flags);
 807         }
 808
 809         /*
 810          * Allow status to settle, then read it again.
 811          * A few rare drives vastly violate the 400ns spec here,
 812          * so we'll wait up to 10usec for a "good" status
 813          * rather than expensively fail things immediately.
 814          * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 815          */
 816         for (i = 0; i < 10; i++) {
 817                 udelay(1);
 818                 if (OK_STAT((stat = hwif->INB(IDE_STATUS_REG)), DRIVE_READY, BUSY_STAT|DRQ_STAT|ERR_STAT)) {
 819                         error = 0;
 820                         break;
 821                 }
 822         }
 823
 824         SELECT_MASK(drive, 0);
 825
 826         enable_irq(hwif->irq);
 827
 828         if (error) {
 829                 (void) ide_dump_status(drive, "set_drive_speed_status", stat);
 830                 return error;
 831         }
 832
 833         drive->id->dma_ultra &= ~0xFF00;
 834         drive->id->dma_mword &= ~0x0F00;
 835         drive->id->dma_1word &= ~0x0F00;
 836
 837 #ifdef CONFIG_BLK_DEV_IDEDMA
 838         if (speed >= XFER_SW_DMA_0)
 839                 hwif->dma_host_on(drive);
 840         else if (hwif->ide_dma_check)   /* check if host supports DMA */
 841                 hwif->dma_off_quietly(drive);
 842 #endif
 843
 844         switch(speed) {
 845                 case XFER_UDMA_7:   drive->id->dma_ultra |= 0x8080; break;
 846                 case XFER_UDMA_6:   drive->id->dma_ultra |= 0x4040; break;
 847                 case XFER_UDMA_5:   drive->id->dma_ultra |= 0x2020; break;
 848                 case XFER_UDMA_4:   drive->id->dma_ultra |= 0x1010; break;
 849                 case XFER_UDMA_3:   drive->id->dma_ultra |= 0x0808; break;
 850                 case XFER_UDMA_2:   drive->id->dma_ultra |= 0x0404; break;
 851                 case XFER_UDMA_1:   drive->id->dma_ultra |= 0x0202; break;
 852                 case XFER_UDMA_0:   drive->id->dma_ultra |= 0x0101; break;
 853                 case XFER_MW_DMA_2: drive->id->dma_mword |= 0x0404; break;
 854                 case XFER_MW_DMA_1: drive->id->dma_mword |= 0x0202; break;
 855                 case XFER_MW_DMA_0: drive->id->dma_mword |= 0x0101; break;
 856                 case XFER_SW_DMA_2: drive->id->dma_1word |= 0x0404; break;
 857                 case XFER_SW_DMA_1: drive->id->dma_1word |= 0x0202; break;
 858                 case XFER_SW_DMA_0: drive->id->dma_1word |= 0x0101; break;
 859                 default: break;
 860         }
 861         if (!drive->init_speed)
 862                 drive->init_speed = speed;
 863         drive->current_speed = speed;
 864         return error;
 865 }
 866
 867 EXPORT_SYMBOL(ide_config_drive_speed);
 868
 869
 870 /*
 871  * This should get invoked any time we exit the driver to
 872  * wait for an interrupt response from a drive.  handler() points
 873  * at the appropriate code to handle the next interrupt, and a
 874  * timer is started to prevent us from waiting forever in case
 875  * something goes wrong (see the ide_timer_expiry() handler later on).
 876  *
 877  * See also ide_execute_command
 878  */
 879 static void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 880                       unsigned int timeout, ide_expiry_t *expiry)
 881 {
 882         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 883
 884         if (hwgroup->handler != NULL) {
 885                 printk(KERN_CRIT "%s: ide_set_handler: handler not null; "
 886                         "old=%p, new=%p\n",
 887                         drive->name, hwgroup->handler, handler);
 888         }
 889         hwgroup->handler        = handler;
 890         hwgroup->expiry         = expiry;
 891         hwgroup->timer.expires  = jiffies + timeout;
 892         hwgroup->req_gen_timer = hwgroup->req_gen;
 893         add_timer(&hwgroup->timer);
 894 }
 895
 896 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 897                       unsigned int timeout, ide_expiry_t *expiry)
 898 {
 899         unsigned long flags;
 900         spin_lock_irqsave(&ide_lock, flags);
 901         __ide_set_handler(drive, handler, timeout, expiry);
 902         spin_unlock_irqrestore(&ide_lock, flags);
 903 }
 904
 905 EXPORT_SYMBOL(ide_set_handler);
 906
 907 /**
 908  *      ide_execute_command     -       execute an IDE command
 909  *      @drive: IDE drive to issue the command against
 910  *      @command: command byte to write
 911  *      @handler: handler for next phase
 912  *      @timeout: timeout for command
 913  *      @expiry:  handler to run on timeout
 914  *
 915  *      Helper function to issue an IDE command. This handles the
 916  *      atomicity requirements, command timing and ensures that the
 917  *      handler and IRQ setup do not race. All IDE command kick off
 918  *      should go via this function or do equivalent locking.
 919  */
 920
 921 void ide_execute_command(ide_drive_t *drive, task_ioreg_t cmd, ide_handler_t *handler, unsigned timeout, ide_expiry_t *expiry)
 922 {
 923         unsigned long flags;
 924         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 925         ide_hwif_t *hwif = HWIF(drive);
 926
 927         spin_lock_irqsave(&ide_lock, flags);
 928
 929         BUG_ON(hwgroup->handler);
 930         hwgroup->handler        = handler;
 931         hwgroup->expiry         = expiry;
 932         hwgroup->timer.expires  = jiffies + timeout;
 933         hwgroup->req_gen_timer = hwgroup->req_gen;
 934         add_timer(&hwgroup->timer);
 935         hwif->OUTBSYNC(drive, cmd, IDE_COMMAND_REG);
 936         /* Drive takes 400nS to respond, we must avoid the IRQ being
 937            serviced before that.
 938
 939            FIXME: we could skip this delay with care on non shared
 940            devices
 941         */
 942         ndelay(400);
 943         spin_unlock_irqrestore(&ide_lock, flags);
 944 }
 945
 946 EXPORT_SYMBOL(ide_execute_command);
 947
 948
 949 /* needed below */
 950 static ide_startstop_t do_reset1 (ide_drive_t *, int);
 951
 952 /*
 953  * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 954  * during an atapi drive reset operation. If the drive has not yet responded,
 955  * and we have not yet hit our maximum waiting time, then the timer is restarted
 956  * for another 50ms.
 957  */
 958 static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
 959 {
 960         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
 961         ide_hwif_t *hwif        = HWIF(drive);
 962         u8 stat;
 963
 964         SELECT_DRIVE(drive);
 965         udelay (10);
 966
 967         if (OK_STAT(stat = hwif->INB(IDE_STATUS_REG), 0, BUSY_STAT)) {
 968                 printk("%s: ATAPI reset complete\n", drive->name);
 969         } else {
 970                 if (time_before(jiffies, hwgroup->poll_timeout)) {
 971                         BUG_ON(HWGROUP(drive)->handler != NULL);
 972                         ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
 973                         /* continue polling */
 974                         return ide_started;
 975                 }
 976                 /* end of polling */
 977                 hwgroup->polling = 0;
 978                 printk("%s: ATAPI reset timed-out, status=0x%02x\n",
 979                                 drive->name, stat);
 980                 /* do it the old fashioned way */
 981                 return do_reset1(drive, 1);
 982         }
 983         /* done polling */
 984         hwgroup->polling = 0;
 985         hwgroup->resetting = 0;
 986         return ide_stopped;
 987 }
 988
 989 /*
 990  * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 991  * during an ide reset operation. If the drives have not yet responded,
 992  * and we have not yet hit our maximum waiting time, then the timer is restarted
 993  * for another 50ms.
 994  */
 995 static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
 996 {
 997         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
 998         ide_hwif_t *hwif        = HWIF(drive);
 999         u8 tmp;
1000
1001         if (hwif->reset_poll != NULL) {
1002                 if (hwif->reset_poll(drive)) {
1003                         printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
1004                                 hwif->name, drive->name);
1005                         return ide_stopped;
1006                 }
1007         }
1008
1009         if (!OK_STAT(tmp = hwif->INB(IDE_STATUS_REG), 0, BUSY_STAT)) {
1010                 if (time_before(jiffies, hwgroup->poll_timeout)) {
1011                         BUG_ON(HWGROUP(drive)->handler != NULL);
1012                         ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1013                         /* continue polling */
1014                         return ide_started;
1015                 }
1016                 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
1017                 drive->failures++;
1018         } else  {
1019                 printk("%s: reset: ", hwif->name);
1020                 if ((tmp = hwif->INB(IDE_ERROR_REG)) == 1) {
1021                         printk("success\n");
1022                         drive->failures = 0;
1023                 } else {
1024                         drive->failures++;
1025                         printk("master: ");
1026                         switch (tmp & 0x7f) {
1027                                 case 1: printk("passed");
1028                                         break;
1029                                 case 2: printk("formatter device error");
1030                                         break;
1031                                 case 3: printk("sector buffer error");
1032                                         break;
1033                                 case 4: printk("ECC circuitry error");
1034                                         break;
1035                                 case 5: printk("controlling MPU error");
1036                                         break;
1037                                 default:printk("error (0x%02x?)", tmp);
1038                         }
1039                         if (tmp & 0x80)
1040                                 printk("; slave: failed");
1041                         printk("\n");
1042                 }
1043         }
1044         hwgroup->polling = 0;   /* done polling */
1045         hwgroup->resetting = 0; /* done reset attempt */
1046         return ide_stopped;
1047 }
1048
1049 static void check_dma_crc(ide_drive_t *drive)
1050 {
1051 #ifdef CONFIG_BLK_DEV_IDEDMA
1052         if (drive->crc_count) {
1053                 drive->hwif->dma_off_quietly(drive);
1054                 ide_set_xfer_rate(drive, ide_auto_reduce_xfer(drive));
1055                 if (drive->current_speed >= XFER_SW_DMA_0)
1056                         (void) HWIF(drive)->ide_dma_on(drive);
1057         } else
1058                 ide_dma_off(drive);
1059 #endif
1060 }
1061
1062 static void ide_disk_pre_reset(ide_drive_t *drive)
1063 {
1064         int legacy = (drive->id->cfs_enable_2 & 0x0400) ? 0 : 1;
1065
1066         drive->special.all = 0;
1067         drive->special.b.set_geometry = legacy;
1068         drive->special.b.recalibrate  = legacy;
1069         if (OK_TO_RESET_CONTROLLER)
1070                 drive->mult_count = 0;
1071         if (!drive->keep_settings && !drive->using_dma)
1072                 drive->mult_req = 0;
1073         if (drive->mult_req != drive->mult_count)
1074                 drive->special.b.set_multmode = 1;
1075 }
1076
1077 static void pre_reset(ide_drive_t *drive)
1078 {
1079         if (drive->media == ide_disk)
1080                 ide_disk_pre_reset(drive);
1081         else
1082                 drive->post_reset = 1;
1083
1084         if (!drive->keep_settings) {
1085                 if (drive->using_dma) {
1086                         check_dma_crc(drive);
1087                 } else {
1088                         drive->unmask = 0;
1089                         drive->io_32bit = 0;
1090                 }
1091                 return;
1092         }
1093         if (drive->using_dma)
1094                 check_dma_crc(drive);
1095
1096         if (HWIF(drive)->pre_reset != NULL)
1097                 HWIF(drive)->pre_reset(drive);
1098
1099         if (drive->current_speed != 0xff)
1100                 drive->desired_speed = drive->current_speed;
1101         drive->current_speed = 0xff;
1102 }
1103
1104 /*
1105  * do_reset1() attempts to recover a confused drive by resetting it.
1106  * Unfortunately, resetting a disk drive actually resets all devices on
1107  * the same interface, so it can really be thought of as resetting the
1108  * interface rather than resetting the drive.
1109  *
1110  * ATAPI devices have their own reset mechanism which allows them to be
1111  * individually reset without clobbering other devices on the same interface.
1112  *
1113  * Unfortunately, the IDE interface does not generate an interrupt to let
1114  * us know when the reset operation has finished, so we must poll for this.
1115  * Equally poor, though, is the fact that this may a very long time to complete,
1116  * (up to 30 seconds worstcase).  So, instead of busy-waiting here for it,
1117  * we set a timer to poll at 50ms intervals.
1118  */
1119 static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
1120 {
1121         unsigned int unit;
1122         unsigned long flags;
1123         ide_hwif_t *hwif;
1124         ide_hwgroup_t *hwgroup;
1125
1126         spin_lock_irqsave(&ide_lock, flags);
1127         hwif = HWIF(drive);
1128         hwgroup = HWGROUP(drive);
1129
1130         /* We must not reset with running handlers */
1131         BUG_ON(hwgroup->handler != NULL);
1132
1133         /* For an ATAPI device, first try an ATAPI SRST. */
1134         if (drive->media != ide_disk && !do_not_try_atapi) {
1135                 hwgroup->resetting = 1;
1136                 pre_reset(drive);
1137                 SELECT_DRIVE(drive);
1138                 udelay (20);
1139                 hwif->OUTBSYNC(drive, WIN_SRST, IDE_COMMAND_REG);
1140                 ndelay(400);
1141                 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1142                 hwgroup->polling = 1;
1143                 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1144                 spin_unlock_irqrestore(&ide_lock, flags);
1145                 return ide_started;
1146         }
1147
1148         /*
1149          * First, reset any device state data we were maintaining
1150          * for any of the drives on this interface.
1151          */
1152         for (unit = 0; unit < MAX_DRIVES; ++unit)
1153                 pre_reset(&hwif->drives[unit]);
1154
1155 #if OK_TO_RESET_CONTROLLER
1156         if (!IDE_CONTROL_REG) {
1157                 spin_unlock_irqrestore(&ide_lock, flags);
1158                 return ide_stopped;
1159         }
1160
1161         hwgroup->resetting = 1;
1162         /*
1163          * Note that we also set nIEN while resetting the device,
1164          * to mask unwanted interrupts from the interface during the reset.
1165          * However, due to the design of PC hardware, this will cause an
1166          * immediate interrupt due to the edge transition it produces.
1167          * This single interrupt gives us a "fast poll" for drives that
1168          * recover from reset very quickly, saving us the first 50ms wait time.
1169          */
1170         /* set SRST and nIEN */
1171         hwif->OUTBSYNC(drive, drive->ctl|6,IDE_CONTROL_REG);
1172         /* more than enough time */
1173         udelay(10);
1174         if (drive->quirk_list == 2) {
1175                 /* clear SRST and nIEN */
1176                 hwif->OUTBSYNC(drive, drive->ctl, IDE_CONTROL_REG);
1177         } else {
1178                 /* clear SRST, leave nIEN */
1179                 hwif->OUTBSYNC(drive, drive->ctl|2, IDE_CONTROL_REG);
1180         }
1181         /* more than enough time */
1182         udelay(10);
1183         hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1184         hwgroup->polling = 1;
1185         __ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1186
1187         /*
1188          * Some weird controller like resetting themselves to a strange
1189          * state when the disks are reset this way. At least, the Winbond
1190          * 553 documentation says that
1191          */
1192         if (hwif->resetproc != NULL) {
1193                 hwif->resetproc(drive);
1194         }
1195
1196 #endif  /* OK_TO_RESET_CONTROLLER */
1197
1198         spin_unlock_irqrestore(&ide_lock, flags);
1199         return ide_started;
1200 }
1201
1202 /*
1203  * ide_do_reset() is the entry point to the drive/interface reset code.
1204  */
1205
1206 ide_startstop_t ide_do_reset (ide_drive_t *drive)
1207 {
1208         return do_reset1(drive, 0);
1209 }
1210
1211 EXPORT_SYMBOL(ide_do_reset);
1212
1213 /*
1214  * ide_wait_not_busy() waits for the currently selected device on the hwif
1215  * to report a non-busy status, see comments in probe_hwif().
1216  */
1217 int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
1218 {
1219         u8 stat = 0;
1220
1221         while(timeout--) {
1222                 /*
1223                  * Turn this into a schedule() sleep once I'm sure
1224                  * about locking issues (2.5 work ?).
1225                  */
1226                 mdelay(1);
1227                 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
1228                 if ((stat & BUSY_STAT) == 0)
1229                         return 0;
1230                 /*
1231                  * Assume a value of 0xff means nothing is connected to
1232                  * the interface and it doesn't implement the pull-down
1233                  * resistor on D7.
1234                  */
1235                 if (stat == 0xff)
1236                         return -ENODEV;
1237                 touch_softlockup_watchdog();
1238                 touch_nmi_watchdog();
1239         }
1240         return -EBUSY;
1241 }
1242
1243 EXPORT_SYMBOL_GPL(ide_wait_not_busy);
1244