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/config.h>
  10 #include <linux/module.h>
  11 #include <linux/types.h>
  12 #include <linux/string.h>
  13 #include <linux/kernel.h>
  14 #include <linux/timer.h>
  15 #include <linux/mm.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/major.h>
  18 #include <linux/errno.h>
  19 #include <linux/genhd.h>
  20 #include <linux/blkpg.h>
  21 #include <linux/slab.h>
  22 #include <linux/pci.h>
  23 #include <linux/delay.h>
  24 #include <linux/hdreg.h>
  25 #include <linux/ide.h>
  26 #include <linux/bitops.h>
  27
  28 #include <asm/byteorder.h>
  29 #include <asm/irq.h>
  30 #include <asm/uaccess.h>
  31 #include <asm/io.h>
  32
  33 /*
  34  *      Conventional PIO operations for ATA devices
  35  */
  36
  37 static u8 ide_inb (unsigned long port)
  38 {
  39         return (u8) inb(port);
  40 }
  41
  42 static u16 ide_inw (unsigned long port)
  43 {
  44         return (u16) inw(port);
  45 }
  46
  47 static void ide_insw (unsigned long port, void *addr, u32 count)
  48 {
  49         insw(port, addr, count);
  50 }
  51
  52 static u32 ide_inl (unsigned long port)
  53 {
  54         return (u32) inl(port);
  55 }
  56
  57 static void ide_insl (unsigned long port, void *addr, u32 count)
  58 {
  59         insl(port, addr, count);
  60 }
  61
  62 static void ide_outb (u8 val, unsigned long port)
  63 {
  64         outb(val, port);
  65 }
  66
  67 static void ide_outbsync (ide_drive_t *drive, u8 addr, unsigned long port)
  68 {
  69         outb(addr, port);
  70 }
  71
  72 static void ide_outw (u16 val, unsigned long port)
  73 {
  74         outw(val, port);
  75 }
  76
  77 static void ide_outsw (unsigned long port, void *addr, u32 count)
  78 {
  79         outsw(port, addr, count);
  80 }
  81
  82 static void ide_outl (u32 val, unsigned long port)
  83 {
  84         outl(val, port);
  85 }
  86
  87 static void ide_outsl (unsigned long port, void *addr, u32 count)
  88 {
  89         outsl(port, addr, count);
  90 }
  91
  92 void default_hwif_iops (ide_hwif_t *hwif)
  93 {
  94         hwif->OUTB      = ide_outb;
  95         hwif->OUTBSYNC  = ide_outbsync;
  96         hwif->OUTW      = ide_outw;
  97         hwif->OUTL      = ide_outl;
  98         hwif->OUTSW     = ide_outsw;
  99         hwif->OUTSL     = ide_outsl;
 100         hwif->INB       = ide_inb;
 101         hwif->INW       = ide_inw;
 102         hwif->INL       = ide_inl;
 103         hwif->INSW      = ide_insw;
 104         hwif->INSL      = ide_insl;
 105 }
 106
 107 EXPORT_SYMBOL(default_hwif_iops);
 108
 109 /*
 110  *      MMIO operations, typically used for SATA controllers
 111  */
 112
 113 static u8 ide_mm_inb (unsigned long port)
 114 {
 115         return (u8) readb((void __iomem *) port);
 116 }
 117
 118 static u16 ide_mm_inw (unsigned long port)
 119 {
 120         return (u16) readw((void __iomem *) port);
 121 }
 122
 123 static void ide_mm_insw (unsigned long port, void *addr, u32 count)
 124 {
 125         __ide_mm_insw((void __iomem *) port, addr, count);
 126 }
 127
 128 static u32 ide_mm_inl (unsigned long port)
 129 {
 130         return (u32) readl((void __iomem *) port);
 131 }
 132
 133 static void ide_mm_insl (unsigned long port, void *addr, u32 count)
 134 {
 135         __ide_mm_insl((void __iomem *) port, addr, count);
 136 }
 137
 138 static void ide_mm_outb (u8 value, unsigned long port)
 139 {
 140         writeb(value, (void __iomem *) port);
 141 }
 142
 143 static void ide_mm_outbsync (ide_drive_t *drive, u8 value, unsigned long port)
 144 {
 145         writeb(value, (void __iomem *) port);
 146 }
 147
 148 static void ide_mm_outw (u16 value, unsigned long port)
 149 {
 150         writew(value, (void __iomem *) port);
 151 }
 152
 153 static void ide_mm_outsw (unsigned long port, void *addr, u32 count)
 154 {
 155         __ide_mm_outsw((void __iomem *) port, addr, count);
 156 }
 157
 158 static void ide_mm_outl (u32 value, unsigned long port)
 159 {
 160         writel(value, (void __iomem *) port);
 161 }
 162
 163 static void ide_mm_outsl (unsigned long port, void *addr, u32 count)
 164 {
 165         __ide_mm_outsl((void __iomem *) port, addr, count);
 166 }
 167
 168 void default_hwif_mmiops (ide_hwif_t *hwif)
 169 {
 170         hwif->OUTB      = ide_mm_outb;
 171         /* Most systems will need to override OUTBSYNC, alas however
 172            this one is controller specific! */
 173         hwif->OUTBSYNC  = ide_mm_outbsync;
 174         hwif->OUTW      = ide_mm_outw;
 175         hwif->OUTL      = ide_mm_outl;
 176         hwif->OUTSW     = ide_mm_outsw;
 177         hwif->OUTSL     = ide_mm_outsl;
 178         hwif->INB       = ide_mm_inb;
 179         hwif->INW       = ide_mm_inw;
 180         hwif->INL       = ide_mm_inl;
 181         hwif->INSW      = ide_mm_insw;
 182         hwif->INSL      = ide_mm_insl;
 183 }
 184
 185 EXPORT_SYMBOL(default_hwif_mmiops);
 186
 187 u32 ide_read_24 (ide_drive_t *drive)
 188 {
 189         u8 hcyl = HWIF(drive)->INB(IDE_HCYL_REG);
 190         u8 lcyl = HWIF(drive)->INB(IDE_LCYL_REG);
 191         u8 sect = HWIF(drive)->INB(IDE_SECTOR_REG);
 192         return (hcyl<<16)|(lcyl<<8)|sect;
 193 }
 194
 195 void SELECT_DRIVE (ide_drive_t *drive)
 196 {
 197         if (HWIF(drive)->selectproc)
 198                 HWIF(drive)->selectproc(drive);
 199         HWIF(drive)->OUTB(drive->select.all, IDE_SELECT_REG);
 200 }
 201
 202 EXPORT_SYMBOL(SELECT_DRIVE);
 203
 204 void SELECT_INTERRUPT (ide_drive_t *drive)
 205 {
 206         if (HWIF(drive)->intrproc)
 207                 HWIF(drive)->intrproc(drive);
 208         else
 209                 HWIF(drive)->OUTB(drive->ctl|2, IDE_CONTROL_REG);
 210 }
 211
 212 void SELECT_MASK (ide_drive_t *drive, int mask)
 213 {
 214         if (HWIF(drive)->maskproc)
 215                 HWIF(drive)->maskproc(drive, mask);
 216 }
 217
 218 void QUIRK_LIST (ide_drive_t *drive)
 219 {
 220         if (HWIF(drive)->quirkproc)
 221                 drive->quirk_list = HWIF(drive)->quirkproc(drive);
 222 }
 223
 224 /*
 225  * Some localbus EIDE interfaces require a special access sequence
 226  * when using 32-bit I/O instructions to transfer data.  We call this
 227  * the "vlb_sync" sequence, which consists of three successive reads
 228  * of the sector count register location, with interrupts disabled
 229  * to ensure that the reads all happen together.
 230  */
 231 static void ata_vlb_sync(ide_drive_t *drive, unsigned long port)
 232 {
 233         (void) HWIF(drive)->INB(port);
 234         (void) HWIF(drive)->INB(port);
 235         (void) HWIF(drive)->INB(port);
 236 }
 237
 238 /*
 239  * This is used for most PIO data transfers *from* the IDE interface
 240  */
 241 static void ata_input_data(ide_drive_t *drive, void *buffer, u32 wcount)
 242 {
 243         ide_hwif_t *hwif        = HWIF(drive);
 244         u8 io_32bit             = drive->io_32bit;
 245
 246         if (io_32bit) {
 247                 if (io_32bit & 2) {
 248                         unsigned long flags;
 249                         local_irq_save(flags);
 250                         ata_vlb_sync(drive, IDE_NSECTOR_REG);
 251                         hwif->INSL(IDE_DATA_REG, buffer, wcount);
 252                         local_irq_restore(flags);
 253                 } else
 254                         hwif->INSL(IDE_DATA_REG, buffer, wcount);
 255         } else {
 256                 hwif->INSW(IDE_DATA_REG, buffer, wcount<<1);
 257         }
 258 }
 259
 260 /*
 261  * This is used for most PIO data transfers *to* the IDE interface
 262  */
 263 static void ata_output_data(ide_drive_t *drive, void *buffer, u32 wcount)
 264 {
 265         ide_hwif_t *hwif        = HWIF(drive);
 266         u8 io_32bit             = drive->io_32bit;
 267
 268         if (io_32bit) {
 269                 if (io_32bit & 2) {
 270                         unsigned long flags;
 271                         local_irq_save(flags);
 272                         ata_vlb_sync(drive, IDE_NSECTOR_REG);
 273                         hwif->OUTSL(IDE_DATA_REG, buffer, wcount);
 274                         local_irq_restore(flags);
 275                 } else
 276                         hwif->OUTSL(IDE_DATA_REG, buffer, wcount);
 277         } else {
 278                 hwif->OUTSW(IDE_DATA_REG, buffer, wcount<<1);
 279         }
 280 }
 281
 282 /*
 283  * The following routines are mainly used by the ATAPI drivers.
 284  *
 285  * These routines will round up any request for an odd number of bytes,
 286  * so if an odd bytecount is specified, be sure that there's at least one
 287  * extra byte allocated for the buffer.
 288  */
 289
 290 static void atapi_input_bytes(ide_drive_t *drive, void *buffer, u32 bytecount)
 291 {
 292         ide_hwif_t *hwif = HWIF(drive);
 293
 294         ++bytecount;
 295 #if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
 296         if (MACH_IS_ATARI || MACH_IS_Q40) {
 297                 /* Atari has a byte-swapped IDE interface */
 298                 insw_swapw(IDE_DATA_REG, buffer, bytecount / 2);
 299                 return;
 300         }
 301 #endif /* CONFIG_ATARI || CONFIG_Q40 */
 302         hwif->ata_input_data(drive, buffer, bytecount / 4);
 303         if ((bytecount & 0x03) >= 2)
 304                 hwif->INSW(IDE_DATA_REG, ((u8 *)buffer)+(bytecount & ~0x03), 1);
 305 }
 306
 307 static void atapi_output_bytes(ide_drive_t *drive, void *buffer, u32 bytecount)
 308 {
 309         ide_hwif_t *hwif = HWIF(drive);
 310
 311         ++bytecount;
 312 #if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
 313         if (MACH_IS_ATARI || MACH_IS_Q40) {
 314                 /* Atari has a byte-swapped IDE interface */
 315                 outsw_swapw(IDE_DATA_REG, buffer, bytecount / 2);
 316                 return;
 317         }
 318 #endif /* CONFIG_ATARI || CONFIG_Q40 */
 319         hwif->ata_output_data(drive, buffer, bytecount / 4);
 320         if ((bytecount & 0x03) >= 2)
 321                 hwif->OUTSW(IDE_DATA_REG, ((u8*)buffer)+(bytecount & ~0x03), 1);
 322 }
 323
 324 void default_hwif_transport(ide_hwif_t *hwif)
 325 {
 326         hwif->ata_input_data            = ata_input_data;
 327         hwif->ata_output_data           = ata_output_data;
 328         hwif->atapi_input_bytes         = atapi_input_bytes;
 329         hwif->atapi_output_bytes        = atapi_output_bytes;
 330 }
 331
 332 EXPORT_SYMBOL(default_hwif_transport);
 333
 334 /*
 335  * Beginning of Taskfile OPCODE Library and feature sets.
 336  */
 337 void ide_fix_driveid (struct hd_driveid *id)
 338 {
 339 #ifndef __LITTLE_ENDIAN
 340 # ifdef __BIG_ENDIAN
 341         int i;
 342         u16 *stringcast;
 343
 344         id->config         = __le16_to_cpu(id->config);
 345         id->cyls           = __le16_to_cpu(id->cyls);
 346         id->reserved2      = __le16_to_cpu(id->reserved2);
 347         id->heads          = __le16_to_cpu(id->heads);
 348         id->track_bytes    = __le16_to_cpu(id->track_bytes);
 349         id->sector_bytes   = __le16_to_cpu(id->sector_bytes);
 350         id->sectors        = __le16_to_cpu(id->sectors);
 351         id->vendor0        = __le16_to_cpu(id->vendor0);
 352         id->vendor1        = __le16_to_cpu(id->vendor1);
 353         id->vendor2        = __le16_to_cpu(id->vendor2);
 354         stringcast = (u16 *)&id->serial_no[0];
 355         for (i = 0; i < (20/2); i++)
 356                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 357         id->buf_type       = __le16_to_cpu(id->buf_type);
 358         id->buf_size       = __le16_to_cpu(id->buf_size);
 359         id->ecc_bytes      = __le16_to_cpu(id->ecc_bytes);
 360         stringcast = (u16 *)&id->fw_rev[0];
 361         for (i = 0; i < (8/2); i++)
 362                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 363         stringcast = (u16 *)&id->model[0];
 364         for (i = 0; i < (40/2); i++)
 365                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 366         id->dword_io       = __le16_to_cpu(id->dword_io);
 367         id->reserved50     = __le16_to_cpu(id->reserved50);
 368         id->field_valid    = __le16_to_cpu(id->field_valid);
 369         id->cur_cyls       = __le16_to_cpu(id->cur_cyls);
 370         id->cur_heads      = __le16_to_cpu(id->cur_heads);
 371         id->cur_sectors    = __le16_to_cpu(id->cur_sectors);
 372         id->cur_capacity0  = __le16_to_cpu(id->cur_capacity0);
 373         id->cur_capacity1  = __le16_to_cpu(id->cur_capacity1);
 374         id->lba_capacity   = __le32_to_cpu(id->lba_capacity);
 375         id->dma_1word      = __le16_to_cpu(id->dma_1word);
 376         id->dma_mword      = __le16_to_cpu(id->dma_mword);
 377         id->eide_pio_modes = __le16_to_cpu(id->eide_pio_modes);
 378         id->eide_dma_min   = __le16_to_cpu(id->eide_dma_min);
 379         id->eide_dma_time  = __le16_to_cpu(id->eide_dma_time);
 380         id->eide_pio       = __le16_to_cpu(id->eide_pio);
 381         id->eide_pio_iordy = __le16_to_cpu(id->eide_pio_iordy);
 382         for (i = 0; i < 2; ++i)
 383                 id->words69_70[i] = __le16_to_cpu(id->words69_70[i]);
 384         for (i = 0; i < 4; ++i)
 385                 id->words71_74[i] = __le16_to_cpu(id->words71_74[i]);
 386         id->queue_depth    = __le16_to_cpu(id->queue_depth);
 387         for (i = 0; i < 4; ++i)
 388                 id->words76_79[i] = __le16_to_cpu(id->words76_79[i]);
 389         id->major_rev_num  = __le16_to_cpu(id->major_rev_num);
 390         id->minor_rev_num  = __le16_to_cpu(id->minor_rev_num);
 391         id->command_set_1  = __le16_to_cpu(id->command_set_1);
 392         id->command_set_2  = __le16_to_cpu(id->command_set_2);
 393         id->cfsse          = __le16_to_cpu(id->cfsse);
 394         id->cfs_enable_1   = __le16_to_cpu(id->cfs_enable_1);
 395         id->cfs_enable_2   = __le16_to_cpu(id->cfs_enable_2);
 396         id->csf_default    = __le16_to_cpu(id->csf_default);
 397         id->dma_ultra      = __le16_to_cpu(id->dma_ultra);
 398         id->trseuc         = __le16_to_cpu(id->trseuc);
 399         id->trsEuc         = __le16_to_cpu(id->trsEuc);
 400         id->CurAPMvalues   = __le16_to_cpu(id->CurAPMvalues);
 401         id->mprc           = __le16_to_cpu(id->mprc);
 402         id->hw_config      = __le16_to_cpu(id->hw_config);
 403         id->acoustic       = __le16_to_cpu(id->acoustic);
 404         id->msrqs          = __le16_to_cpu(id->msrqs);
 405         id->sxfert         = __le16_to_cpu(id->sxfert);
 406         id->sal            = __le16_to_cpu(id->sal);
 407         id->spg            = __le32_to_cpu(id->spg);
 408         id->lba_capacity_2 = __le64_to_cpu(id->lba_capacity_2);
 409         for (i = 0; i < 22; i++)
 410                 id->words104_125[i]   = __le16_to_cpu(id->words104_125[i]);
 411         id->last_lun       = __le16_to_cpu(id->last_lun);
 412         id->word127        = __le16_to_cpu(id->word127);
 413         id->dlf            = __le16_to_cpu(id->dlf);
 414         id->csfo           = __le16_to_cpu(id->csfo);
 415         for (i = 0; i < 26; i++)
 416                 id->words130_155[i] = __le16_to_cpu(id->words130_155[i]);
 417         id->word156        = __le16_to_cpu(id->word156);
 418         for (i = 0; i < 3; i++)
 419                 id->words157_159[i] = __le16_to_cpu(id->words157_159[i]);
 420         id->cfa_power      = __le16_to_cpu(id->cfa_power);
 421         for (i = 0; i < 14; i++)
 422                 id->words161_175[i] = __le16_to_cpu(id->words161_175[i]);
 423         for (i = 0; i < 31; i++)
 424                 id->words176_205[i] = __le16_to_cpu(id->words176_205[i]);
 425         for (i = 0; i < 48; i++)
 426                 id->words206_254[i] = __le16_to_cpu(id->words206_254[i]);
 427         id->integrity_word  = __le16_to_cpu(id->integrity_word);
 428 # else
 429 #  error "Please fix <asm/byteorder.h>"
 430 # endif
 431 #endif
 432 }
 433
 434 /* FIXME: exported for use by the USB storage (isd200.c) code only */
 435 EXPORT_SYMBOL(ide_fix_driveid);
 436
 437 void ide_fixstring (u8 *s, const int bytecount, const int byteswap)
 438 {
 439         u8 *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
 440
 441         if (byteswap) {
 442                 /* convert from big-endian to host byte order */
 443                 for (p = end ; p != s;) {
 444                         unsigned short *pp = (unsigned short *) (p -= 2);
 445                         *pp = ntohs(*pp);
 446                 }
 447         }
 448         /* strip leading blanks */
 449         while (s != end && *s == ' ')
 450                 ++s;
 451         /* compress internal blanks and strip trailing blanks */
 452         while (s != end && *s) {
 453                 if (*s++ != ' ' || (s != end && *s && *s != ' '))
 454                         *p++ = *(s-1);
 455         }
 456         /* wipe out trailing garbage */
 457         while (p != end)
 458                 *p++ = '\0';
 459 }
 460
 461 EXPORT_SYMBOL(ide_fixstring);
 462
 463 /*
 464  * Needed for PCI irq sharing
 465  */
 466 int drive_is_ready (ide_drive_t *drive)
 467 {
 468         ide_hwif_t *hwif        = HWIF(drive);
 469         u8 stat                 = 0;
 470
 471         if (drive->waiting_for_dma)
 472                 return hwif->ide_dma_test_irq(drive);
 473
 474 #if 0
 475         /* need to guarantee 400ns since last command was issued */
 476         udelay(1);
 477 #endif
 478
 479 #ifdef CONFIG_IDEPCI_SHARE_IRQ
 480         /*
 481          * We do a passive status test under shared PCI interrupts on
 482          * cards that truly share the ATA side interrupt, but may also share
 483          * an interrupt with another pci card/device.  We make no assumptions
 484          * about possible isa-pnp and pci-pnp issues yet.
 485          */
 486         if (IDE_CONTROL_REG)
 487                 stat = hwif->INB(IDE_ALTSTATUS_REG);
 488         else
 489 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
 490                 /* Note: this may clear a pending IRQ!! */
 491                 stat = hwif->INB(IDE_STATUS_REG);
 492
 493         if (stat & BUSY_STAT)
 494                 /* drive busy:  definitely not interrupting */
 495                 return 0;
 496
 497         /* drive ready: *might* be interrupting */
 498         return 1;
 499 }
 500
 501 EXPORT_SYMBOL(drive_is_ready);
 502
 503 /*
 504  * Global for All, and taken from ide-pmac.c. Can be called
 505  * with spinlock held & IRQs disabled, so don't schedule !
 506  */
 507 int wait_for_ready (ide_drive_t *drive, int timeout)
 508 {
 509         ide_hwif_t *hwif        = HWIF(drive);
 510         u8 stat                 = 0;
 511
 512         while(--timeout) {
 513                 stat = hwif->INB(IDE_STATUS_REG);
 514                 if (!(stat & BUSY_STAT)) {
 515                         if (drive->ready_stat == 0)
 516                                 break;
 517                         else if ((stat & drive->ready_stat)||(stat & ERR_STAT))
 518                                 break;
 519                 }
 520                 mdelay(1);
 521         }
 522         if ((stat & ERR_STAT) || timeout <= 0) {
 523                 if (stat & ERR_STAT) {
 524                         printk(KERN_ERR "%s: wait_for_ready, "
 525                                 "error status: %x\n", drive->name, stat);
 526                 }
 527                 return 1;
 528         }
 529         return 0;
 530 }
 531
 532 EXPORT_SYMBOL(wait_for_ready);
 533
 534 /*
 535  * This routine busy-waits for the drive status to be not "busy".
 536  * It then checks the status for all of the "good" bits and none
 537  * of the "bad" bits, and if all is okay it returns 0.  All other
 538  * cases return 1 after invoking ide_error() -- caller should just return.
 539  *
 540  * This routine should get fixed to not hog the cpu during extra long waits..
 541  * That could be done by busy-waiting for the first jiffy or two, and then
 542  * setting a timer to wake up at half second intervals thereafter,
 543  * until timeout is achieved, before timing out.
 544  */
 545 int ide_wait_stat (ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout)
 546 {
 547         ide_hwif_t *hwif = HWIF(drive);
 548         u8 stat;
 549         int i;
 550         unsigned long flags;
 551
 552         /* bail early if we've exceeded max_failures */
 553         if (drive->max_failures && (drive->failures > drive->max_failures)) {
 554                 *startstop = ide_stopped;
 555                 return 1;
 556         }
 557
 558         udelay(1);      /* spec allows drive 400ns to assert "BUSY" */
 559         if ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 560                 local_irq_set(flags);
 561                 timeout += jiffies;
 562                 while ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 563                         if (time_after(jiffies, timeout)) {
 564                                 /*
 565                                  * One last read after the timeout in case
 566                                  * heavy interrupt load made us not make any
 567                                  * progress during the timeout..
 568                                  */
 569                                 stat = hwif->INB(IDE_STATUS_REG);
 570                                 if (!(stat & BUSY_STAT))
 571                                         break;
 572
 573                                 local_irq_restore(flags);
 574                                 *startstop = ide_error(drive, "status timeout", stat);
 575                                 return 1;
 576                         }
 577                 }
 578                 local_irq_restore(flags);
 579         }
 580         /*
 581          * Allow status to settle, then read it again.
 582          * A few rare drives vastly violate the 400ns spec here,
 583          * so we'll wait up to 10usec for a "good" status
 584          * rather than expensively fail things immediately.
 585          * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 586          */
 587         for (i = 0; i < 10; i++) {
 588                 udelay(1);
 589                 if (OK_STAT((stat = hwif->INB(IDE_STATUS_REG)), good, bad))
 590                         return 0;
 591         }
 592         *startstop = ide_error(drive, "status error", stat);
 593         return 1;
 594 }
 595
 596 EXPORT_SYMBOL(ide_wait_stat);
 597
 598 /*
 599  *  All hosts that use the 80c ribbon must use!
 600  *  The name is derived from upper byte of word 93 and the 80c ribbon.
 601  */
 602 u8 eighty_ninty_three (ide_drive_t *drive)
 603 {
 604         if(HWIF(drive)->udma_four == 0)
 605                 return 0;
 606         if (!(drive->id->hw_config & 0x6000))
 607                 return 0;
 608 #ifndef CONFIG_IDEDMA_IVB
 609         if(!(drive->id->hw_config & 0x4000))
 610                 return 0;
 611 #endif /* CONFIG_IDEDMA_IVB */
 612         return 1;
 613 }
 614
 615 EXPORT_SYMBOL(eighty_ninty_three);
 616
 617 int ide_ata66_check (ide_drive_t *drive, ide_task_t *args)
 618 {
 619         if ((args->tfRegister[IDE_COMMAND_OFFSET] == WIN_SETFEATURES) &&
 620             (args->tfRegister[IDE_SECTOR_OFFSET] > XFER_UDMA_2) &&
 621             (args->tfRegister[IDE_FEATURE_OFFSET] == SETFEATURES_XFER)) {
 622 #ifndef CONFIG_IDEDMA_IVB
 623                 if ((drive->id->hw_config & 0x6000) == 0) {
 624 #else /* !CONFIG_IDEDMA_IVB */
 625                 if (((drive->id->hw_config & 0x2000) == 0) ||
 626                     ((drive->id->hw_config & 0x4000) == 0)) {
 627 #endif /* CONFIG_IDEDMA_IVB */
 628                         printk("%s: Speed warnings UDMA 3/4/5 is not "
 629                                 "functional.\n", drive->name);
 630                         return 1;
 631                 }
 632                 if (!HWIF(drive)->udma_four) {
 633                         printk("%s: Speed warnings UDMA 3/4/5 is not "
 634                                 "functional.\n",
 635                                 HWIF(drive)->name);
 636                         return 1;
 637                 }
 638         }
 639         return 0;
 640 }
 641
 642 /*
 643  * Backside of HDIO_DRIVE_CMD call of SETFEATURES_XFER.
 644  * 1 : Safe to update drive->id DMA registers.
 645  * 0 : OOPs not allowed.
 646  */
 647 int set_transfer (ide_drive_t *drive, ide_task_t *args)
 648 {
 649         if ((args->tfRegister[IDE_COMMAND_OFFSET] == WIN_SETFEATURES) &&
 650             (args->tfRegister[IDE_SECTOR_OFFSET] >= XFER_SW_DMA_0) &&
 651             (args->tfRegister[IDE_FEATURE_OFFSET] == SETFEATURES_XFER) &&
 652             (drive->id->dma_ultra ||
 653              drive->id->dma_mword ||
 654              drive->id->dma_1word))
 655                 return 1;
 656
 657         return 0;
 658 }
 659
 660 #ifdef CONFIG_BLK_DEV_IDEDMA
 661 static u8 ide_auto_reduce_xfer (ide_drive_t *drive)
 662 {
 663         if (!drive->crc_count)
 664                 return drive->current_speed;
 665         drive->crc_count = 0;
 666
 667         switch(drive->current_speed) {
 668                 case XFER_UDMA_7:       return XFER_UDMA_6;
 669                 case XFER_UDMA_6:       return XFER_UDMA_5;
 670                 case XFER_UDMA_5:       return XFER_UDMA_4;
 671                 case XFER_UDMA_4:       return XFER_UDMA_3;
 672                 case XFER_UDMA_3:       return XFER_UDMA_2;
 673                 case XFER_UDMA_2:       return XFER_UDMA_1;
 674                 case XFER_UDMA_1:       return XFER_UDMA_0;
 675                         /*
 676                          * OOPS we do not goto non Ultra DMA modes
 677                          * without iCRC's available we force
 678                          * the system to PIO and make the user
 679                          * invoke the ATA-1 ATA-2 DMA modes.
 680                          */
 681                 case XFER_UDMA_0:
 682                 default:                return XFER_PIO_4;
 683         }
 684 }
 685 #endif /* CONFIG_BLK_DEV_IDEDMA */
 686
 687 /*
 688  * Update the
 689  */
 690 int ide_driveid_update (ide_drive_t *drive)
 691 {
 692         ide_hwif_t *hwif        = HWIF(drive);
 693         struct hd_driveid *id;
 694 #if 0
 695         id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
 696         if (!id)
 697                 return 0;
 698
 699         taskfile_lib_get_identify(drive, (char *)&id);
 700
 701         ide_fix_driveid(id);
 702         if (id) {
 703                 drive->id->dma_ultra = id->dma_ultra;
 704                 drive->id->dma_mword = id->dma_mword;
 705                 drive->id->dma_1word = id->dma_1word;
 706                 /* anything more ? */
 707                 kfree(id);
 708         }
 709         return 1;
 710 #else
 711         /*
 712          * Re-read drive->id for possible DMA mode
 713          * change (copied from ide-probe.c)
 714          */
 715         unsigned long timeout, flags;
 716
 717         SELECT_MASK(drive, 1);
 718         if (IDE_CONTROL_REG)
 719                 hwif->OUTB(drive->ctl,IDE_CONTROL_REG);
 720         msleep(50);
 721         hwif->OUTB(WIN_IDENTIFY, IDE_COMMAND_REG);
 722         timeout = jiffies + WAIT_WORSTCASE;
 723         do {
 724                 if (time_after(jiffies, timeout)) {
 725                         SELECT_MASK(drive, 0);
 726                         return 0;       /* drive timed-out */
 727                 }
 728                 msleep(50);     /* give drive a breather */
 729         } while (hwif->INB(IDE_ALTSTATUS_REG) & BUSY_STAT);
 730         msleep(50);     /* wait for IRQ and DRQ_STAT */
 731         if (!OK_STAT(hwif->INB(IDE_STATUS_REG),DRQ_STAT,BAD_R_STAT)) {
 732                 SELECT_MASK(drive, 0);
 733                 printk("%s: CHECK for good STATUS\n", drive->name);
 734                 return 0;
 735         }
 736         local_irq_save(flags);
 737         SELECT_MASK(drive, 0);
 738         id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
 739         if (!id) {
 740                 local_irq_restore(flags);
 741                 return 0;
 742         }
 743         ata_input_data(drive, id, SECTOR_WORDS);
 744         (void) hwif->INB(IDE_STATUS_REG);       /* clear drive IRQ */
 745         local_irq_enable();
 746         local_irq_restore(flags);
 747         ide_fix_driveid(id);
 748         if (id) {
 749                 drive->id->dma_ultra = id->dma_ultra;
 750                 drive->id->dma_mword = id->dma_mword;
 751                 drive->id->dma_1word = id->dma_1word;
 752                 /* anything more ? */
 753                 kfree(id);
 754         }
 755
 756         return 1;
 757 #endif
 758 }
 759
 760 /*
 761  * Similar to ide_wait_stat(), except it never calls ide_error internally.
 762  * This is a kludge to handle the new ide_config_drive_speed() function,
 763  * and should not otherwise be used anywhere.  Eventually, the tuneproc's
 764  * should be updated to return ide_startstop_t, in which case we can get
 765  * rid of this abomination again.  :)   -ml
 766  *
 767  * It is gone..........
 768  *
 769  * const char *msg == consider adding for verbose errors.
 770  */
 771 int ide_config_drive_speed (ide_drive_t *drive, u8 speed)
 772 {
 773         ide_hwif_t *hwif        = HWIF(drive);
 774         int     i, error        = 1;
 775         u8 stat;
 776
 777 //      while (HWGROUP(drive)->busy)
 778 //              msleep(50);
 779
 780 #ifdef CONFIG_BLK_DEV_IDEDMA
 781         if (hwif->ide_dma_check)         /* check if host supports DMA */
 782                 hwif->ide_dma_host_off(drive);
 783 #endif
 784
 785         /*
 786          * Don't use ide_wait_cmd here - it will
 787          * attempt to set_geometry and recalibrate,
 788          * but for some reason these don't work at
 789          * this point (lost interrupt).
 790          */
 791         /*
 792          * Select the drive, and issue the SETFEATURES command
 793          */
 794         disable_irq_nosync(hwif->irq);
 795
 796         /*
 797          *      FIXME: we race against the running IRQ here if
 798          *      this is called from non IRQ context. If we use
 799          *      disable_irq() we hang on the error path. Work
 800          *      is needed.
 801          */
 802
 803         udelay(1);
 804         SELECT_DRIVE(drive);
 805         SELECT_MASK(drive, 0);
 806         udelay(1);
 807         if (IDE_CONTROL_REG)
 808                 hwif->OUTB(drive->ctl | 2, IDE_CONTROL_REG);
 809         hwif->OUTB(speed, IDE_NSECTOR_REG);
 810         hwif->OUTB(SETFEATURES_XFER, IDE_FEATURE_REG);
 811         hwif->OUTB(WIN_SETFEATURES, IDE_COMMAND_REG);
 812         if ((IDE_CONTROL_REG) && (drive->quirk_list == 2))
 813                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
 814         udelay(1);
 815         /*
 816          * Wait for drive to become non-BUSY
 817          */
 818         if ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 819                 unsigned long flags, timeout;
 820                 local_irq_set(flags);
 821                 timeout = jiffies + WAIT_CMD;
 822                 while ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 823                         if (time_after(jiffies, timeout))
 824                                 break;
 825                 }
 826                 local_irq_restore(flags);
 827         }
 828
 829         /*
 830          * Allow status to settle, then read it again.
 831          * A few rare drives vastly violate the 400ns spec here,
 832          * so we'll wait up to 10usec for a "good" status
 833          * rather than expensively fail things immediately.
 834          * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 835          */
 836         for (i = 0; i < 10; i++) {
 837                 udelay(1);
 838                 if (OK_STAT((stat = hwif->INB(IDE_STATUS_REG)), DRIVE_READY, BUSY_STAT|DRQ_STAT|ERR_STAT)) {
 839                         error = 0;
 840                         break;
 841                 }
 842         }
 843
 844         SELECT_MASK(drive, 0);
 845
 846         enable_irq(hwif->irq);
 847
 848         if (error) {
 849                 (void) ide_dump_status(drive, "set_drive_speed_status", stat);
 850                 return error;
 851         }
 852
 853         drive->id->dma_ultra &= ~0xFF00;
 854         drive->id->dma_mword &= ~0x0F00;
 855         drive->id->dma_1word &= ~0x0F00;
 856
 857 #ifdef CONFIG_BLK_DEV_IDEDMA
 858         if (speed >= XFER_SW_DMA_0)
 859                 hwif->ide_dma_host_on(drive);
 860         else if (hwif->ide_dma_check)   /* check if host supports DMA */
 861                 hwif->ide_dma_off_quietly(drive);
 862 #endif
 863
 864         switch(speed) {
 865                 case XFER_UDMA_7:   drive->id->dma_ultra |= 0x8080; break;
 866                 case XFER_UDMA_6:   drive->id->dma_ultra |= 0x4040; break;
 867                 case XFER_UDMA_5:   drive->id->dma_ultra |= 0x2020; break;
 868                 case XFER_UDMA_4:   drive->id->dma_ultra |= 0x1010; break;
 869                 case XFER_UDMA_3:   drive->id->dma_ultra |= 0x0808; break;
 870                 case XFER_UDMA_2:   drive->id->dma_ultra |= 0x0404; break;
 871                 case XFER_UDMA_1:   drive->id->dma_ultra |= 0x0202; break;
 872                 case XFER_UDMA_0:   drive->id->dma_ultra |= 0x0101; break;
 873                 case XFER_MW_DMA_2: drive->id->dma_mword |= 0x0404; break;
 874                 case XFER_MW_DMA_1: drive->id->dma_mword |= 0x0202; break;
 875                 case XFER_MW_DMA_0: drive->id->dma_mword |= 0x0101; break;
 876                 case XFER_SW_DMA_2: drive->id->dma_1word |= 0x0404; break;
 877                 case XFER_SW_DMA_1: drive->id->dma_1word |= 0x0202; break;
 878                 case XFER_SW_DMA_0: drive->id->dma_1word |= 0x0101; break;
 879                 default: break;
 880         }
 881         if (!drive->init_speed)
 882                 drive->init_speed = speed;
 883         drive->current_speed = speed;
 884         return error;
 885 }
 886
 887 EXPORT_SYMBOL(ide_config_drive_speed);
 888
 889
 890 /*
 891  * This should get invoked any time we exit the driver to
 892  * wait for an interrupt response from a drive.  handler() points
 893  * at the appropriate code to handle the next interrupt, and a
 894  * timer is started to prevent us from waiting forever in case
 895  * something goes wrong (see the ide_timer_expiry() handler later on).
 896  *
 897  * See also ide_execute_command
 898  */
 899 static void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 900                       unsigned int timeout, ide_expiry_t *expiry)
 901 {
 902         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 903
 904         if (hwgroup->handler != NULL) {
 905                 printk(KERN_CRIT "%s: ide_set_handler: handler not null; "
 906                         "old=%p, new=%p\n",
 907                         drive->name, hwgroup->handler, handler);
 908         }
 909         hwgroup->handler        = handler;
 910         hwgroup->expiry         = expiry;
 911         hwgroup->timer.expires  = jiffies + timeout;
 912         add_timer(&hwgroup->timer);
 913 }
 914
 915 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 916                       unsigned int timeout, ide_expiry_t *expiry)
 917 {
 918         unsigned long flags;
 919         spin_lock_irqsave(&ide_lock, flags);
 920         __ide_set_handler(drive, handler, timeout, expiry);
 921         spin_unlock_irqrestore(&ide_lock, flags);
 922 }
 923
 924 EXPORT_SYMBOL(ide_set_handler);
 925
 926 /**
 927  *      ide_execute_command     -       execute an IDE command
 928  *      @drive: IDE drive to issue the command against
 929  *      @command: command byte to write
 930  *      @handler: handler for next phase
 931  *      @timeout: timeout for command
 932  *      @expiry:  handler to run on timeout
 933  *
 934  *      Helper function to issue an IDE command. This handles the
 935  *      atomicity requirements, command timing and ensures that the
 936  *      handler and IRQ setup do not race. All IDE command kick off
 937  *      should go via this function or do equivalent locking.
 938  */
 939
 940 void ide_execute_command(ide_drive_t *drive, task_ioreg_t cmd, ide_handler_t *handler, unsigned timeout, ide_expiry_t *expiry)
 941 {
 942         unsigned long flags;
 943         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 944         ide_hwif_t *hwif = HWIF(drive);
 945
 946         spin_lock_irqsave(&ide_lock, flags);
 947
 948         if(hwgroup->handler)
 949                 BUG();
 950         hwgroup->handler        = handler;
 951         hwgroup->expiry         = expiry;
 952         hwgroup->timer.expires  = jiffies + timeout;
 953         add_timer(&hwgroup->timer);
 954         hwif->OUTBSYNC(drive, cmd, IDE_COMMAND_REG);
 955         /* Drive takes 400nS to respond, we must avoid the IRQ being
 956            serviced before that.
 957
 958            FIXME: we could skip this delay with care on non shared
 959            devices
 960         */
 961         ndelay(400);
 962         spin_unlock_irqrestore(&ide_lock, flags);
 963 }
 964
 965 EXPORT_SYMBOL(ide_execute_command);
 966
 967
 968 /* needed below */
 969 static ide_startstop_t do_reset1 (ide_drive_t *, int);
 970
 971 /*
 972  * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 973  * during an atapi drive reset operation. If the drive has not yet responded,
 974  * and we have not yet hit our maximum waiting time, then the timer is restarted
 975  * for another 50ms.
 976  */
 977 static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
 978 {
 979         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
 980         ide_hwif_t *hwif        = HWIF(drive);
 981         u8 stat;
 982
 983         SELECT_DRIVE(drive);
 984         udelay (10);
 985
 986         if (OK_STAT(stat = hwif->INB(IDE_STATUS_REG), 0, BUSY_STAT)) {
 987                 printk("%s: ATAPI reset complete\n", drive->name);
 988         } else {
 989                 if (time_before(jiffies, hwgroup->poll_timeout)) {
 990                         if (HWGROUP(drive)->handler != NULL)
 991                                 BUG();
 992                         ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
 993                         /* continue polling */
 994                         return ide_started;
 995                 }
 996                 /* end of polling */
 997                 hwgroup->polling = 0;
 998                 printk("%s: ATAPI reset timed-out, status=0x%02x\n",
 999                                 drive->name, stat);
1000                 /* do it the old fashioned way */
1001                 return do_reset1(drive, 1);
1002         }
1003         /* done polling */
1004         hwgroup->polling = 0;
1005         return ide_stopped;
1006 }
1007
1008 /*
1009  * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
1010  * during an ide reset operation. If the drives have not yet responded,
1011  * and we have not yet hit our maximum waiting time, then the timer is restarted
1012  * for another 50ms.
1013  */
1014 static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
1015 {
1016         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
1017         ide_hwif_t *hwif        = HWIF(drive);
1018         u8 tmp;
1019
1020         if (hwif->reset_poll != NULL) {
1021                 if (hwif->reset_poll(drive)) {
1022                         printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
1023                                 hwif->name, drive->name);
1024                         return ide_stopped;
1025                 }
1026         }
1027
1028         if (!OK_STAT(tmp = hwif->INB(IDE_STATUS_REG), 0, BUSY_STAT)) {
1029                 if (time_before(jiffies, hwgroup->poll_timeout)) {
1030                         if (HWGROUP(drive)->handler != NULL)
1031                                 BUG();
1032                         ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1033                         /* continue polling */
1034                         return ide_started;
1035                 }
1036                 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
1037                 drive->failures++;
1038         } else  {
1039                 printk("%s: reset: ", hwif->name);
1040                 if ((tmp = hwif->INB(IDE_ERROR_REG)) == 1) {
1041                         printk("success\n");
1042                         drive->failures = 0;
1043                 } else {
1044                         drive->failures++;
1045                         printk("master: ");
1046                         switch (tmp & 0x7f) {
1047                                 case 1: printk("passed");
1048                                         break;
1049                                 case 2: printk("formatter device error");
1050                                         break;
1051                                 case 3: printk("sector buffer error");
1052                                         break;
1053                                 case 4: printk("ECC circuitry error");
1054                                         break;
1055                                 case 5: printk("controlling MPU error");
1056                                         break;
1057                                 default:printk("error (0x%02x?)", tmp);
1058                         }
1059                         if (tmp & 0x80)
1060                                 printk("; slave: failed");
1061                         printk("\n");
1062                 }
1063         }
1064         hwgroup->polling = 0;   /* done polling */
1065         return ide_stopped;
1066 }
1067
1068 static void check_dma_crc(ide_drive_t *drive)
1069 {
1070 #ifdef CONFIG_BLK_DEV_IDEDMA
1071         if (drive->crc_count) {
1072                 (void) HWIF(drive)->ide_dma_off_quietly(drive);
1073                 ide_set_xfer_rate(drive, ide_auto_reduce_xfer(drive));
1074                 if (drive->current_speed >= XFER_SW_DMA_0)
1075                         (void) HWIF(drive)->ide_dma_on(drive);
1076         } else
1077                 (void)__ide_dma_off(drive);
1078 #endif
1079 }
1080
1081 static void ide_disk_pre_reset(ide_drive_t *drive)
1082 {
1083         int legacy = (drive->id->cfs_enable_2 & 0x0400) ? 0 : 1;
1084
1085         drive->special.all = 0;
1086         drive->special.b.set_geometry = legacy;
1087         drive->special.b.recalibrate  = legacy;
1088         if (OK_TO_RESET_CONTROLLER)
1089                 drive->mult_count = 0;
1090         if (!drive->keep_settings && !drive->using_dma)
1091                 drive->mult_req = 0;
1092         if (drive->mult_req != drive->mult_count)
1093                 drive->special.b.set_multmode = 1;
1094 }
1095
1096 static void pre_reset(ide_drive_t *drive)
1097 {
1098         if (drive->media == ide_disk)
1099                 ide_disk_pre_reset(drive);
1100         else
1101                 drive->post_reset = 1;
1102
1103         if (!drive->keep_settings) {
1104                 if (drive->using_dma) {
1105                         check_dma_crc(drive);
1106                 } else {
1107                         drive->unmask = 0;
1108                         drive->io_32bit = 0;
1109                 }
1110                 return;
1111         }
1112         if (drive->using_dma)
1113                 check_dma_crc(drive);
1114
1115         if (HWIF(drive)->pre_reset != NULL)
1116                 HWIF(drive)->pre_reset(drive);
1117
1118 }
1119
1120 /*
1121  * do_reset1() attempts to recover a confused drive by resetting it.
1122  * Unfortunately, resetting a disk drive actually resets all devices on
1123  * the same interface, so it can really be thought of as resetting the
1124  * interface rather than resetting the drive.
1125  *
1126  * ATAPI devices have their own reset mechanism which allows them to be
1127  * individually reset without clobbering other devices on the same interface.
1128  *
1129  * Unfortunately, the IDE interface does not generate an interrupt to let
1130  * us know when the reset operation has finished, so we must poll for this.
1131  * Equally poor, though, is the fact that this may a very long time to complete,
1132  * (up to 30 seconds worstcase).  So, instead of busy-waiting here for it,
1133  * we set a timer to poll at 50ms intervals.
1134  */
1135 static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
1136 {
1137         unsigned int unit;
1138         unsigned long flags;
1139         ide_hwif_t *hwif;
1140         ide_hwgroup_t *hwgroup;
1141
1142         spin_lock_irqsave(&ide_lock, flags);
1143         hwif = HWIF(drive);
1144         hwgroup = HWGROUP(drive);
1145
1146         /* We must not reset with running handlers */
1147         if(hwgroup->handler != NULL)
1148                 BUG();
1149
1150         /* For an ATAPI device, first try an ATAPI SRST. */
1151         if (drive->media != ide_disk && !do_not_try_atapi) {
1152                 pre_reset(drive);
1153                 SELECT_DRIVE(drive);
1154                 udelay (20);
1155                 hwif->OUTBSYNC(drive, WIN_SRST, IDE_COMMAND_REG);
1156                 ndelay(400);
1157                 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1158                 hwgroup->polling = 1;
1159                 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1160                 spin_unlock_irqrestore(&ide_lock, flags);
1161                 return ide_started;
1162         }
1163
1164         /*
1165          * First, reset any device state data we were maintaining
1166          * for any of the drives on this interface.
1167          */
1168         for (unit = 0; unit < MAX_DRIVES; ++unit)
1169                 pre_reset(&hwif->drives[unit]);
1170
1171 #if OK_TO_RESET_CONTROLLER
1172         if (!IDE_CONTROL_REG) {
1173                 spin_unlock_irqrestore(&ide_lock, flags);
1174                 return ide_stopped;
1175         }
1176
1177         /*
1178          * Note that we also set nIEN while resetting the device,
1179          * to mask unwanted interrupts from the interface during the reset.
1180          * However, due to the design of PC hardware, this will cause an
1181          * immediate interrupt due to the edge transition it produces.
1182          * This single interrupt gives us a "fast poll" for drives that
1183          * recover from reset very quickly, saving us the first 50ms wait time.
1184          */
1185         /* set SRST and nIEN */
1186         hwif->OUTBSYNC(drive, drive->ctl|6,IDE_CONTROL_REG);
1187         /* more than enough time */
1188         udelay(10);
1189         if (drive->quirk_list == 2) {
1190                 /* clear SRST and nIEN */
1191                 hwif->OUTBSYNC(drive, drive->ctl, IDE_CONTROL_REG);
1192         } else {
1193                 /* clear SRST, leave nIEN */
1194                 hwif->OUTBSYNC(drive, drive->ctl|2, IDE_CONTROL_REG);
1195         }
1196         /* more than enough time */
1197         udelay(10);
1198         hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1199         hwgroup->polling = 1;
1200         __ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1201
1202         /*
1203          * Some weird controller like resetting themselves to a strange
1204          * state when the disks are reset this way. At least, the Winbond
1205          * 553 documentation says that
1206          */
1207         if (hwif->resetproc != NULL) {
1208                 hwif->resetproc(drive);
1209         }
1210
1211 #endif  /* OK_TO_RESET_CONTROLLER */
1212
1213         spin_unlock_irqrestore(&ide_lock, flags);
1214         return ide_started;
1215 }
1216
1217 /*
1218  * ide_do_reset() is the entry point to the drive/interface reset code.
1219  */
1220
1221 ide_startstop_t ide_do_reset (ide_drive_t *drive)
1222 {
1223         return do_reset1(drive, 0);
1224 }
1225
1226 EXPORT_SYMBOL(ide_do_reset);
1227
1228 /*
1229  * ide_wait_not_busy() waits for the currently selected device on the hwif
1230  * to report a non-busy status, see comments in probe_hwif().
1231  */
1232 int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
1233 {
1234         u8 stat = 0;
1235
1236         while(timeout--) {
1237                 /*
1238                  * Turn this into a schedule() sleep once I'm sure
1239                  * about locking issues (2.5 work ?).
1240                  */
1241                 mdelay(1);
1242                 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
1243                 if ((stat & BUSY_STAT) == 0)
1244                         return 0;
1245                 /*
1246                  * Assume a value of 0xff means nothing is connected to
1247                  * the interface and it doesn't implement the pull-down
1248                  * resistor on D7.
1249                  */
1250                 if (stat == 0xff)
1251                         return -ENODEV;
1252         }
1253         return -EBUSY;
1254 }
1255
1256 EXPORT_SYMBOL_GPL(ide_wait_not_busy);
1257