drivers/ide/ide-iops.c

   1 /*
   2  * linux/drivers/ide/ide-iops.c Version 0.37    Mar 05, 2003
   3  *
   4  *  Copyright (C) 2000-2002     Andre Hedrick <andre@linux-ide.org>
   5  *  Copyright (C) 2003          Red Hat <alan@redhat.com>
   6  *
   7  */
   8
   9 #include <linux/config.h>
  10 #include <linux/module.h>
  11 #include <linux/types.h>
  12 #include <linux/string.h>
  13 #include <linux/kernel.h>
  14 #include <linux/timer.h>
  15 #include <linux/mm.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/major.h>
  18 #include <linux/errno.h>
  19 #include <linux/genhd.h>
  20 #include <linux/blkpg.h>
  21 #include <linux/slab.h>
  22 #include <linux/pci.h>
  23 #include <linux/delay.h>
  24 #include <linux/hdreg.h>
  25 #include <linux/ide.h>
  26
  27 #include <asm/byteorder.h>
  28 #include <asm/irq.h>
  29 #include <asm/uaccess.h>
  30 #include <asm/io.h>
  31 #include <asm/bitops.h>
  32
  33 /*
  34  *      Conventional PIO operations for ATA devices
  35  */
  36
  37 static u8 ide_inb (unsigned long port)
  38 {
  39         return (u8) inb(port);
  40 }
  41
  42 static u16 ide_inw (unsigned long port)
  43 {
  44         return (u16) inw(port);
  45 }
  46
  47 static void ide_insw (unsigned long port, void *addr, u32 count)
  48 {
  49         insw(port, addr, count);
  50 }
  51
  52 static u32 ide_inl (unsigned long port)
  53 {
  54         return (u32) inl(port);
  55 }
  56
  57 static void ide_insl (unsigned long port, void *addr, u32 count)
  58 {
  59         insl(port, addr, count);
  60 }
  61
  62 static void ide_outb (u8 val, unsigned long port)
  63 {
  64         outb(val, port);
  65 }
  66
  67 static void ide_outbsync (ide_drive_t *drive, u8 addr, unsigned long port)
  68 {
  69         outb(addr, port);
  70 }
  71
  72 static void ide_outw (u16 val, unsigned long port)
  73 {
  74         outw(val, port);
  75 }
  76
  77 static void ide_outsw (unsigned long port, void *addr, u32 count)
  78 {
  79         outsw(port, addr, count);
  80 }
  81
  82 static void ide_outl (u32 val, unsigned long port)
  83 {
  84         outl(val, port);
  85 }
  86
  87 static void ide_outsl (unsigned long port, void *addr, u32 count)
  88 {
  89         outsl(port, addr, count);
  90 }
  91
  92 void default_hwif_iops (ide_hwif_t *hwif)
  93 {
  94         hwif->OUTB      = ide_outb;
  95         hwif->OUTBSYNC  = ide_outbsync;
  96         hwif->OUTW      = ide_outw;
  97         hwif->OUTL      = ide_outl;
  98         hwif->OUTSW     = ide_outsw;
  99         hwif->OUTSL     = ide_outsl;
 100         hwif->INB       = ide_inb;
 101         hwif->INW       = ide_inw;
 102         hwif->INL       = ide_inl;
 103         hwif->INSW      = ide_insw;
 104         hwif->INSL      = ide_insl;
 105 }
 106
 107 EXPORT_SYMBOL(default_hwif_iops);
 108
 109 /*
 110  *      Interface removed
 111  */
 112
 113 static u8 ide_no_inb(unsigned long port)
 114 {
 115         return 0xFF;
 116 }
 117
 118 static u16 ide_no_inw (unsigned long port)
 119 {
 120         return 0xFFFF;
 121 }
 122
 123 static void ide_no_insw (unsigned long port, void *addr, u32 count)
 124 {
 125 }
 126
 127 static u32 ide_no_inl (unsigned long port)
 128 {
 129         return 0xFFFFFFFF;
 130 }
 131
 132 static void ide_no_insl (unsigned long port, void *addr, u32 count)
 133 {
 134 }
 135
 136 static void ide_no_outb (u8 val, unsigned long port)
 137 {
 138 }
 139
 140 static void ide_no_outbsync (ide_drive_t *drive, u8 addr, unsigned long port)
 141 {
 142 }
 143
 144 static void ide_no_outw (u16 val, unsigned long port)
 145 {
 146 }
 147
 148 static void ide_no_outsw (unsigned long port, void *addr, u32 count)
 149 {
 150 }
 151
 152 static void ide_no_outl (u32 val, unsigned long port)
 153 {
 154 }
 155
 156 static void ide_no_outsl (unsigned long port, void *addr, u32 count)
 157 {
 158 }
 159
 160 void removed_hwif_iops (ide_hwif_t *hwif)
 161 {
 162         hwif->OUTB      = ide_no_outb;
 163         hwif->OUTBSYNC  = ide_no_outbsync;
 164         hwif->OUTW      = ide_no_outw;
 165         hwif->OUTL      = ide_no_outl;
 166         hwif->OUTSW     = ide_no_outsw;
 167         hwif->OUTSL     = ide_no_outsl;
 168         hwif->INB       = ide_no_inb;
 169         hwif->INW       = ide_no_inw;
 170         hwif->INL       = ide_no_inl;
 171         hwif->INSW      = ide_no_insw;
 172         hwif->INSL      = ide_no_insl;
 173 }
 174
 175 EXPORT_SYMBOL(removed_hwif_iops);
 176
 177 /*
 178  *      MMIO operations, typically used for SATA controllers
 179  */
 180
 181 static u8 ide_mm_inb (unsigned long port)
 182 {
 183         return (u8) readb((void __iomem *) port);
 184 }
 185
 186 static u16 ide_mm_inw (unsigned long port)
 187 {
 188         return (u16) readw((void __iomem *) port);
 189 }
 190
 191 static void ide_mm_insw (unsigned long port, void *addr, u32 count)
 192 {
 193         __ide_mm_insw((void __iomem *) port, addr, count);
 194 }
 195
 196 static u32 ide_mm_inl (unsigned long port)
 197 {
 198         return (u32) readl((void __iomem *) port);
 199 }
 200
 201 static void ide_mm_insl (unsigned long port, void *addr, u32 count)
 202 {
 203         __ide_mm_insl((void __iomem *) port, addr, count);
 204 }
 205
 206 static void ide_mm_outb (u8 value, unsigned long port)
 207 {
 208         writeb(value, (void __iomem *) port);
 209 }
 210
 211 static void ide_mm_outbsync (ide_drive_t *drive, u8 value, unsigned long port)
 212 {
 213         writeb(value, (void __iomem *) port);
 214 }
 215
 216 static void ide_mm_outw (u16 value, unsigned long port)
 217 {
 218         writew(value, (void __iomem *) port);
 219 }
 220
 221 static void ide_mm_outsw (unsigned long port, void *addr, u32 count)
 222 {
 223         __ide_mm_outsw((void __iomem *) port, addr, count);
 224 }
 225
 226 static void ide_mm_outl (u32 value, unsigned long port)
 227 {
 228         writel(value, (void __iomem *) port);
 229 }
 230
 231 static void ide_mm_outsl (unsigned long port, void *addr, u32 count)
 232 {
 233         __ide_mm_outsl((void __iomem *) port, addr, count);
 234 }
 235
 236 void default_hwif_mmiops (ide_hwif_t *hwif)
 237 {
 238         hwif->OUTB      = ide_mm_outb;
 239         /* Most systems will need to override OUTBSYNC, alas however
 240            this one is controller specific! */
 241         hwif->OUTBSYNC  = ide_mm_outbsync;
 242         hwif->OUTW      = ide_mm_outw;
 243         hwif->OUTL      = ide_mm_outl;
 244         hwif->OUTSW     = ide_mm_outsw;
 245         hwif->OUTSL     = ide_mm_outsl;
 246         hwif->INB       = ide_mm_inb;
 247         hwif->INW       = ide_mm_inw;
 248         hwif->INL       = ide_mm_inl;
 249         hwif->INSW      = ide_mm_insw;
 250         hwif->INSL      = ide_mm_insl;
 251 }
 252
 253 EXPORT_SYMBOL(default_hwif_mmiops);
 254
 255 void default_hwif_transport (ide_hwif_t *hwif)
 256 {
 257         hwif->ata_input_data            = ata_input_data;
 258         hwif->ata_output_data           = ata_output_data;
 259         hwif->atapi_input_bytes         = atapi_input_bytes;
 260         hwif->atapi_output_bytes        = atapi_output_bytes;
 261 }
 262
 263 EXPORT_SYMBOL(default_hwif_transport);
 264
 265 u32 ide_read_24 (ide_drive_t *drive)
 266 {
 267         u8 hcyl = HWIF(drive)->INB(IDE_HCYL_REG);
 268         u8 lcyl = HWIF(drive)->INB(IDE_LCYL_REG);
 269         u8 sect = HWIF(drive)->INB(IDE_SECTOR_REG);
 270         return (hcyl<<16)|(lcyl<<8)|sect;
 271 }
 272
 273 EXPORT_SYMBOL(ide_read_24);
 274
 275 void SELECT_DRIVE (ide_drive_t *drive)
 276 {
 277         if (HWIF(drive)->selectproc)
 278                 HWIF(drive)->selectproc(drive);
 279         HWIF(drive)->OUTB(drive->select.all, IDE_SELECT_REG);
 280 }
 281
 282 EXPORT_SYMBOL(SELECT_DRIVE);
 283
 284 void SELECT_INTERRUPT (ide_drive_t *drive)
 285 {
 286         if (HWIF(drive)->intrproc)
 287                 HWIF(drive)->intrproc(drive);
 288         else
 289                 HWIF(drive)->OUTB(drive->ctl|2, IDE_CONTROL_REG);
 290 }
 291
 292 void SELECT_MASK (ide_drive_t *drive, int mask)
 293 {
 294         if (HWIF(drive)->maskproc)
 295                 HWIF(drive)->maskproc(drive, mask);
 296 }
 297
 298 void QUIRK_LIST (ide_drive_t *drive)
 299 {
 300         if (HWIF(drive)->quirkproc)
 301                 drive->quirk_list = HWIF(drive)->quirkproc(drive);
 302 }
 303
 304 /*
 305  * Some localbus EIDE interfaces require a special access sequence
 306  * when using 32-bit I/O instructions to transfer data.  We call this
 307  * the "vlb_sync" sequence, which consists of three successive reads
 308  * of the sector count register location, with interrupts disabled
 309  * to ensure that the reads all happen together.
 310  */
 311 void ata_vlb_sync (ide_drive_t *drive, unsigned long port)
 312 {
 313         (void) HWIF(drive)->INB(port);
 314         (void) HWIF(drive)->INB(port);
 315         (void) HWIF(drive)->INB(port);
 316 }
 317
 318 /*
 319  * This is used for most PIO data transfers *from* the IDE interface
 320  */
 321 void ata_input_data (ide_drive_t *drive, void *buffer, u32 wcount)
 322 {
 323         ide_hwif_t *hwif        = HWIF(drive);
 324         u8 io_32bit             = drive->io_32bit;
 325
 326         if (io_32bit) {
 327                 if (io_32bit & 2) {
 328                         unsigned long flags;
 329                         local_irq_save(flags);
 330                         ata_vlb_sync(drive, IDE_NSECTOR_REG);
 331                         hwif->INSL(IDE_DATA_REG, buffer, wcount);
 332                         local_irq_restore(flags);
 333                 } else
 334                         hwif->INSL(IDE_DATA_REG, buffer, wcount);
 335         } else {
 336                 hwif->INSW(IDE_DATA_REG, buffer, wcount<<1);
 337         }
 338 }
 339
 340 /*
 341  * This is used for most PIO data transfers *to* the IDE interface
 342  */
 343 void ata_output_data (ide_drive_t *drive, void *buffer, u32 wcount)
 344 {
 345         ide_hwif_t *hwif        = HWIF(drive);
 346         u8 io_32bit             = drive->io_32bit;
 347
 348         if (io_32bit) {
 349                 if (io_32bit & 2) {
 350                         unsigned long flags;
 351                         local_irq_save(flags);
 352                         ata_vlb_sync(drive, IDE_NSECTOR_REG);
 353                         hwif->OUTSL(IDE_DATA_REG, buffer, wcount);
 354                         local_irq_restore(flags);
 355                 } else
 356                         hwif->OUTSL(IDE_DATA_REG, buffer, wcount);
 357         } else {
 358                 hwif->OUTSW(IDE_DATA_REG, buffer, wcount<<1);
 359         }
 360 }
 361
 362 /*
 363  * The following routines are mainly used by the ATAPI drivers.
 364  *
 365  * These routines will round up any request for an odd number of bytes,
 366  * so if an odd bytecount is specified, be sure that there's at least one
 367  * extra byte allocated for the buffer.
 368  */
 369
 370 void atapi_input_bytes (ide_drive_t *drive, void *buffer, u32 bytecount)
 371 {
 372         ide_hwif_t *hwif = HWIF(drive);
 373
 374         ++bytecount;
 375 #if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
 376         if (MACH_IS_ATARI || MACH_IS_Q40) {
 377                 /* Atari has a byte-swapped IDE interface */
 378                 insw_swapw(IDE_DATA_REG, buffer, bytecount / 2);
 379                 return;
 380         }
 381 #endif /* CONFIG_ATARI || CONFIG_Q40 */
 382         hwif->ata_input_data(drive, buffer, bytecount / 4);
 383         if ((bytecount & 0x03) >= 2)
 384                 hwif->INSW(IDE_DATA_REG, ((u8 *)buffer)+(bytecount & ~0x03), 1);
 385 }
 386
 387 EXPORT_SYMBOL(atapi_input_bytes);
 388
 389 void atapi_output_bytes (ide_drive_t *drive, void *buffer, u32 bytecount)
 390 {
 391         ide_hwif_t *hwif = HWIF(drive);
 392
 393         ++bytecount;
 394 #if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
 395         if (MACH_IS_ATARI || MACH_IS_Q40) {
 396                 /* Atari has a byte-swapped IDE interface */
 397                 outsw_swapw(IDE_DATA_REG, buffer, bytecount / 2);
 398                 return;
 399         }
 400 #endif /* CONFIG_ATARI || CONFIG_Q40 */
 401         hwif->ata_output_data(drive, buffer, bytecount / 4);
 402         if ((bytecount & 0x03) >= 2)
 403                 hwif->OUTSW(IDE_DATA_REG, ((u8*)buffer)+(bytecount & ~0x03), 1);
 404 }
 405
 406 EXPORT_SYMBOL(atapi_output_bytes);
 407
 408 /*
 409  * Beginning of Taskfile OPCODE Library and feature sets.
 410  */
 411 void ide_fix_driveid (struct hd_driveid *id)
 412 {
 413 #ifndef __LITTLE_ENDIAN
 414 # ifdef __BIG_ENDIAN
 415         int i;
 416         u16 *stringcast;
 417
 418         id->config         = __le16_to_cpu(id->config);
 419         id->cyls           = __le16_to_cpu(id->cyls);
 420         id->reserved2      = __le16_to_cpu(id->reserved2);
 421         id->heads          = __le16_to_cpu(id->heads);
 422         id->track_bytes    = __le16_to_cpu(id->track_bytes);
 423         id->sector_bytes   = __le16_to_cpu(id->sector_bytes);
 424         id->sectors        = __le16_to_cpu(id->sectors);
 425         id->vendor0        = __le16_to_cpu(id->vendor0);
 426         id->vendor1        = __le16_to_cpu(id->vendor1);
 427         id->vendor2        = __le16_to_cpu(id->vendor2);
 428         stringcast = (u16 *)&id->serial_no[0];
 429         for (i = 0; i < (20/2); i++)
 430                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 431         id->buf_type       = __le16_to_cpu(id->buf_type);
 432         id->buf_size       = __le16_to_cpu(id->buf_size);
 433         id->ecc_bytes      = __le16_to_cpu(id->ecc_bytes);
 434         stringcast = (u16 *)&id->fw_rev[0];
 435         for (i = 0; i < (8/2); i++)
 436                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 437         stringcast = (u16 *)&id->model[0];
 438         for (i = 0; i < (40/2); i++)
 439                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 440         id->dword_io       = __le16_to_cpu(id->dword_io);
 441         id->reserved50     = __le16_to_cpu(id->reserved50);
 442         id->field_valid    = __le16_to_cpu(id->field_valid);
 443         id->cur_cyls       = __le16_to_cpu(id->cur_cyls);
 444         id->cur_heads      = __le16_to_cpu(id->cur_heads);
 445         id->cur_sectors    = __le16_to_cpu(id->cur_sectors);
 446         id->cur_capacity0  = __le16_to_cpu(id->cur_capacity0);
 447         id->cur_capacity1  = __le16_to_cpu(id->cur_capacity1);
 448         id->lba_capacity   = __le32_to_cpu(id->lba_capacity);
 449         id->dma_1word      = __le16_to_cpu(id->dma_1word);
 450         id->dma_mword      = __le16_to_cpu(id->dma_mword);
 451         id->eide_pio_modes = __le16_to_cpu(id->eide_pio_modes);
 452         id->eide_dma_min   = __le16_to_cpu(id->eide_dma_min);
 453         id->eide_dma_time  = __le16_to_cpu(id->eide_dma_time);
 454         id->eide_pio       = __le16_to_cpu(id->eide_pio);
 455         id->eide_pio_iordy = __le16_to_cpu(id->eide_pio_iordy);
 456         for (i = 0; i < 2; ++i)
 457                 id->words69_70[i] = __le16_to_cpu(id->words69_70[i]);
 458         for (i = 0; i < 4; ++i)
 459                 id->words71_74[i] = __le16_to_cpu(id->words71_74[i]);
 460         id->queue_depth    = __le16_to_cpu(id->queue_depth);
 461         for (i = 0; i < 4; ++i)
 462                 id->words76_79[i] = __le16_to_cpu(id->words76_79[i]);
 463         id->major_rev_num  = __le16_to_cpu(id->major_rev_num);
 464         id->minor_rev_num  = __le16_to_cpu(id->minor_rev_num);
 465         id->command_set_1  = __le16_to_cpu(id->command_set_1);
 466         id->command_set_2  = __le16_to_cpu(id->command_set_2);
 467         id->cfsse          = __le16_to_cpu(id->cfsse);
 468         id->cfs_enable_1   = __le16_to_cpu(id->cfs_enable_1);
 469         id->cfs_enable_2   = __le16_to_cpu(id->cfs_enable_2);
 470         id->csf_default    = __le16_to_cpu(id->csf_default);
 471         id->dma_ultra      = __le16_to_cpu(id->dma_ultra);
 472         id->trseuc         = __le16_to_cpu(id->trseuc);
 473         id->trsEuc         = __le16_to_cpu(id->trsEuc);
 474         id->CurAPMvalues   = __le16_to_cpu(id->CurAPMvalues);
 475         id->mprc           = __le16_to_cpu(id->mprc);
 476         id->hw_config      = __le16_to_cpu(id->hw_config);
 477         id->acoustic       = __le16_to_cpu(id->acoustic);
 478         id->msrqs          = __le16_to_cpu(id->msrqs);
 479         id->sxfert         = __le16_to_cpu(id->sxfert);
 480         id->sal            = __le16_to_cpu(id->sal);
 481         id->spg            = __le32_to_cpu(id->spg);
 482         id->lba_capacity_2 = __le64_to_cpu(id->lba_capacity_2);
 483         for (i = 0; i < 22; i++)
 484                 id->words104_125[i]   = __le16_to_cpu(id->words104_125[i]);
 485         id->last_lun       = __le16_to_cpu(id->last_lun);
 486         id->word127        = __le16_to_cpu(id->word127);
 487         id->dlf            = __le16_to_cpu(id->dlf);
 488         id->csfo           = __le16_to_cpu(id->csfo);
 489         for (i = 0; i < 26; i++)
 490                 id->words130_155[i] = __le16_to_cpu(id->words130_155[i]);
 491         id->word156        = __le16_to_cpu(id->word156);
 492         for (i = 0; i < 3; i++)
 493                 id->words157_159[i] = __le16_to_cpu(id->words157_159[i]);
 494         id->cfa_power      = __le16_to_cpu(id->cfa_power);
 495         for (i = 0; i < 14; i++)
 496                 id->words161_175[i] = __le16_to_cpu(id->words161_175[i]);
 497         for (i = 0; i < 31; i++)
 498                 id->words176_205[i] = __le16_to_cpu(id->words176_205[i]);
 499         for (i = 0; i < 48; i++)
 500                 id->words206_254[i] = __le16_to_cpu(id->words206_254[i]);
 501         id->integrity_word  = __le16_to_cpu(id->integrity_word);
 502 # else
 503 #  error "Please fix <asm/byteorder.h>"
 504 # endif
 505 #endif
 506 }
 507
 508 EXPORT_SYMBOL(ide_fix_driveid);
 509
 510 void ide_fixstring (u8 *s, const int bytecount, const int byteswap)
 511 {
 512         u8 *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
 513
 514         if (byteswap) {
 515                 /* convert from big-endian to host byte order */
 516                 for (p = end ; p != s;) {
 517                         unsigned short *pp = (unsigned short *) (p -= 2);
 518                         *pp = ntohs(*pp);
 519                 }
 520         }
 521         /* strip leading blanks */
 522         while (s != end && *s == ' ')
 523                 ++s;
 524         /* compress internal blanks and strip trailing blanks */
 525         while (s != end && *s) {
 526                 if (*s++ != ' ' || (s != end && *s && *s != ' '))
 527                         *p++ = *(s-1);
 528         }
 529         /* wipe out trailing garbage */
 530         while (p != end)
 531                 *p++ = '\0';
 532 }
 533
 534 EXPORT_SYMBOL(ide_fixstring);
 535
 536 /*
 537  * Needed for PCI irq sharing
 538  */
 539 int drive_is_ready (ide_drive_t *drive)
 540 {
 541         ide_hwif_t *hwif        = HWIF(drive);
 542         u8 stat                 = 0;
 543
 544         if (drive->waiting_for_dma)
 545                 return hwif->ide_dma_test_irq(drive);
 546
 547 #if 0
 548         /* need to guarantee 400ns since last command was issued */
 549         udelay(1);
 550 #endif
 551
 552 #ifdef CONFIG_IDEPCI_SHARE_IRQ
 553         /*
 554          * We do a passive status test under shared PCI interrupts on
 555          * cards that truly share the ATA side interrupt, but may also share
 556          * an interrupt with another pci card/device.  We make no assumptions
 557          * about possible isa-pnp and pci-pnp issues yet.
 558          */
 559         if (IDE_CONTROL_REG)
 560                 stat = hwif->INB(IDE_ALTSTATUS_REG);
 561         else
 562 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
 563                 /* Note: this may clear a pending IRQ!! */
 564                 stat = hwif->INB(IDE_STATUS_REG);
 565
 566         if (stat & BUSY_STAT)
 567                 /* drive busy:  definitely not interrupting */
 568                 return 0;
 569
 570         /* drive ready: *might* be interrupting */
 571         return 1;
 572 }
 573
 574 EXPORT_SYMBOL(drive_is_ready);
 575
 576 /*
 577  * Global for All, and taken from ide-pmac.c. Can be called
 578  * with spinlock held & IRQs disabled, so don't schedule !
 579  */
 580 int wait_for_ready (ide_drive_t *drive, int timeout)
 581 {
 582         ide_hwif_t *hwif        = HWIF(drive);
 583         u8 stat                 = 0;
 584
 585         while(--timeout) {
 586                 stat = hwif->INB(IDE_STATUS_REG);
 587                 if (!(stat & BUSY_STAT)) {
 588                         if (drive->ready_stat == 0)
 589                                 break;
 590                         else if ((stat & drive->ready_stat)||(stat & ERR_STAT))
 591                                 break;
 592                 }
 593                 mdelay(1);
 594         }
 595         if ((stat & ERR_STAT) || timeout <= 0) {
 596                 if (stat & ERR_STAT) {
 597                         printk(KERN_ERR "%s: wait_for_ready, "
 598                                 "error status: %x\n", drive->name, stat);
 599                 }
 600                 return 1;
 601         }
 602         return 0;
 603 }
 604
 605 EXPORT_SYMBOL(wait_for_ready);
 606
 607 /*
 608  * This routine busy-waits for the drive status to be not "busy".
 609  * It then checks the status for all of the "good" bits and none
 610  * of the "bad" bits, and if all is okay it returns 0.  All other
 611  * cases return 1 after invoking ide_error() -- caller should just return.
 612  *
 613  * This routine should get fixed to not hog the cpu during extra long waits..
 614  * That could be done by busy-waiting for the first jiffy or two, and then
 615  * setting a timer to wake up at half second intervals thereafter,
 616  * until timeout is achieved, before timing out.
 617  */
 618 int ide_wait_stat (ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout)
 619 {
 620         ide_hwif_t *hwif = HWIF(drive);
 621         u8 stat;
 622         int i;
 623         unsigned long flags;
 624
 625         /* bail early if we've exceeded max_failures */
 626         if (drive->max_failures && (drive->failures > drive->max_failures)) {
 627                 *startstop = ide_stopped;
 628                 return 1;
 629         }
 630
 631         udelay(1);      /* spec allows drive 400ns to assert "BUSY" */
 632         if ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 633                 local_irq_set(flags);
 634                 timeout += jiffies;
 635                 while ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 636                         if (time_after(jiffies, timeout)) {
 637                                 /*
 638                                  * One last read after the timeout in case
 639                                  * heavy interrupt load made us not make any
 640                                  * progress during the timeout..
 641                                  */
 642                                 stat = hwif->INB(IDE_STATUS_REG);
 643                                 if (!(stat & BUSY_STAT))
 644                                         break;
 645
 646                                 local_irq_restore(flags);
 647                                 *startstop = DRIVER(drive)->error(drive, "status timeout", stat);
 648                                 return 1;
 649                         }
 650                 }
 651                 local_irq_restore(flags);
 652         }
 653         /*
 654          * Allow status to settle, then read it again.
 655          * A few rare drives vastly violate the 400ns spec here,
 656          * so we'll wait up to 10usec for a "good" status
 657          * rather than expensively fail things immediately.
 658          * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 659          */
 660         for (i = 0; i < 10; i++) {
 661                 udelay(1);
 662                 if (OK_STAT((stat = hwif->INB(IDE_STATUS_REG)), good, bad))
 663                         return 0;
 664         }
 665         *startstop = DRIVER(drive)->error(drive, "status error", stat);
 666         return 1;
 667 }
 668
 669 EXPORT_SYMBOL(ide_wait_stat);
 670
 671 /*
 672  *  All hosts that use the 80c ribbon must use!
 673  *  The name is derived from upper byte of word 93 and the 80c ribbon.
 674  */
 675 u8 eighty_ninty_three (ide_drive_t *drive)
 676 {
 677 #if 0
 678         if (!HWIF(drive)->udma_four)
 679                 return 0;
 680
 681         if (drive->id->major_rev_num) {
 682                 int hssbd = 0;
 683                 int i;
 684                 /*
 685                  * Determine highest Supported SPEC
 686                  */
 687                 for (i=1; i<=15; i++)
 688                         if (drive->id->major_rev_num & (1<<i))
 689                                 hssbd++;
 690
 691                 switch (hssbd) {
 692                         case 7:
 693                         case 6:
 694                         case 5:
 695                 /* ATA-4 and older do not support above Ultra 33 */
 696                         default:
 697                                 return 0;
 698                 }
 699         }
 700
 701         return ((u8) (
 702 #ifndef CONFIG_IDEDMA_IVB
 703                 (drive->id->hw_config & 0x4000) &&
 704 #endif /* CONFIG_IDEDMA_IVB */
 705                  (drive->id->hw_config & 0x6000)) ? 1 : 0);
 706
 707 #else
 708
 709         return ((u8) ((HWIF(drive)->udma_four) &&
 710 #ifndef CONFIG_IDEDMA_IVB
 711                         (drive->id->hw_config & 0x4000) &&
 712 #endif /* CONFIG_IDEDMA_IVB */
 713                         (drive->id->hw_config & 0x6000)) ? 1 : 0);
 714 #endif
 715 }
 716
 717 EXPORT_SYMBOL(eighty_ninty_three);
 718
 719 int ide_ata66_check (ide_drive_t *drive, ide_task_t *args)
 720 {
 721         if ((args->tfRegister[IDE_COMMAND_OFFSET] == WIN_SETFEATURES) &&
 722             (args->tfRegister[IDE_SECTOR_OFFSET] > XFER_UDMA_2) &&
 723             (args->tfRegister[IDE_FEATURE_OFFSET] == SETFEATURES_XFER)) {
 724 #ifndef CONFIG_IDEDMA_IVB
 725                 if ((drive->id->hw_config & 0x6000) == 0) {
 726 #else /* !CONFIG_IDEDMA_IVB */
 727                 if (((drive->id->hw_config & 0x2000) == 0) ||
 728                     ((drive->id->hw_config & 0x4000) == 0)) {
 729 #endif /* CONFIG_IDEDMA_IVB */
 730                         printk("%s: Speed warnings UDMA 3/4/5 is not "
 731                                 "functional.\n", drive->name);
 732                         return 1;
 733                 }
 734                 if (!HWIF(drive)->udma_four) {
 735                         printk("%s: Speed warnings UDMA 3/4/5 is not "
 736                                 "functional.\n",
 737                                 HWIF(drive)->name);
 738                         return 1;
 739                 }
 740         }
 741         return 0;
 742 }
 743
 744 EXPORT_SYMBOL(ide_ata66_check);
 745
 746 /*
 747  * Backside of HDIO_DRIVE_CMD call of SETFEATURES_XFER.
 748  * 1 : Safe to update drive->id DMA registers.
 749  * 0 : OOPs not allowed.
 750  */
 751 int set_transfer (ide_drive_t *drive, ide_task_t *args)
 752 {
 753         if ((args->tfRegister[IDE_COMMAND_OFFSET] == WIN_SETFEATURES) &&
 754             (args->tfRegister[IDE_SECTOR_OFFSET] >= XFER_SW_DMA_0) &&
 755             (args->tfRegister[IDE_FEATURE_OFFSET] == SETFEATURES_XFER) &&
 756             (drive->id->dma_ultra ||
 757              drive->id->dma_mword ||
 758              drive->id->dma_1word))
 759                 return 1;
 760
 761         return 0;
 762 }
 763
 764 EXPORT_SYMBOL(set_transfer);
 765
 766 u8 ide_auto_reduce_xfer (ide_drive_t *drive)
 767 {
 768         if (!drive->crc_count)
 769                 return drive->current_speed;
 770         drive->crc_count = 0;
 771
 772         switch(drive->current_speed) {
 773                 case XFER_UDMA_7:       return XFER_UDMA_6;
 774                 case XFER_UDMA_6:       return XFER_UDMA_5;
 775                 case XFER_UDMA_5:       return XFER_UDMA_4;
 776                 case XFER_UDMA_4:       return XFER_UDMA_3;
 777                 case XFER_UDMA_3:       return XFER_UDMA_2;
 778                 case XFER_UDMA_2:       return XFER_UDMA_1;
 779                 case XFER_UDMA_1:       return XFER_UDMA_0;
 780                         /*
 781                          * OOPS we do not goto non Ultra DMA modes
 782                          * without iCRC's available we force
 783                          * the system to PIO and make the user
 784                          * invoke the ATA-1 ATA-2 DMA modes.
 785                          */
 786                 case XFER_UDMA_0:
 787                 default:                return XFER_PIO_4;
 788         }
 789 }
 790
 791 EXPORT_SYMBOL(ide_auto_reduce_xfer);
 792
 793 /*
 794  * Update the
 795  */
 796 int ide_driveid_update (ide_drive_t *drive)
 797 {
 798         ide_hwif_t *hwif        = HWIF(drive);
 799         struct hd_driveid *id;
 800 #if 0
 801         id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
 802         if (!id)
 803                 return 0;
 804
 805         taskfile_lib_get_identify(drive, (char *)&id);
 806
 807         ide_fix_driveid(id);
 808         if (id) {
 809                 drive->id->dma_ultra = id->dma_ultra;
 810                 drive->id->dma_mword = id->dma_mword;
 811                 drive->id->dma_1word = id->dma_1word;
 812                 /* anything more ? */
 813                 kfree(id);
 814         }
 815         return 1;
 816 #else
 817         /*
 818          * Re-read drive->id for possible DMA mode
 819          * change (copied from ide-probe.c)
 820          */
 821         unsigned long timeout, flags;
 822
 823         SELECT_MASK(drive, 1);
 824         if (IDE_CONTROL_REG)
 825                 hwif->OUTB(drive->ctl,IDE_CONTROL_REG);
 826         msleep(50);
 827         hwif->OUTB(WIN_IDENTIFY, IDE_COMMAND_REG);
 828         timeout = jiffies + WAIT_WORSTCASE;
 829         do {
 830                 if (time_after(jiffies, timeout)) {
 831                         SELECT_MASK(drive, 0);
 832                         return 0;       /* drive timed-out */
 833                 }
 834                 msleep(50);     /* give drive a breather */
 835         } while (hwif->INB(IDE_ALTSTATUS_REG) & BUSY_STAT);
 836         msleep(50);     /* wait for IRQ and DRQ_STAT */
 837         if (!OK_STAT(hwif->INB(IDE_STATUS_REG),DRQ_STAT,BAD_R_STAT)) {
 838                 SELECT_MASK(drive, 0);
 839                 printk("%s: CHECK for good STATUS\n", drive->name);
 840                 return 0;
 841         }
 842         local_irq_save(flags);
 843         SELECT_MASK(drive, 0);
 844         id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
 845         if (!id) {
 846                 local_irq_restore(flags);
 847                 return 0;
 848         }
 849         ata_input_data(drive, id, SECTOR_WORDS);
 850         (void) hwif->INB(IDE_STATUS_REG);       /* clear drive IRQ */
 851         local_irq_enable();
 852         local_irq_restore(flags);
 853         ide_fix_driveid(id);
 854         if (id) {
 855                 drive->id->dma_ultra = id->dma_ultra;
 856                 drive->id->dma_mword = id->dma_mword;
 857                 drive->id->dma_1word = id->dma_1word;
 858                 /* anything more ? */
 859                 kfree(id);
 860         }
 861
 862         return 1;
 863 #endif
 864 }
 865
 866 EXPORT_SYMBOL(ide_driveid_update);
 867
 868 /*
 869  * Similar to ide_wait_stat(), except it never calls ide_error internally.
 870  * This is a kludge to handle the new ide_config_drive_speed() function,
 871  * and should not otherwise be used anywhere.  Eventually, the tuneproc's
 872  * should be updated to return ide_startstop_t, in which case we can get
 873  * rid of this abomination again.  :)   -ml
 874  *
 875  * It is gone..........
 876  *
 877  * const char *msg == consider adding for verbose errors.
 878  */
 879 int ide_config_drive_speed (ide_drive_t *drive, u8 speed)
 880 {
 881         ide_hwif_t *hwif        = HWIF(drive);
 882         int     i, error        = 1;
 883         u8 stat;
 884
 885 //      while (HWGROUP(drive)->busy)
 886 //              msleep(50);
 887
 888 #ifdef CONFIG_BLK_DEV_IDEDMA
 889         if (hwif->ide_dma_check)         /* check if host supports DMA */
 890                 hwif->ide_dma_host_off(drive);
 891 #endif
 892
 893         /*
 894          * Don't use ide_wait_cmd here - it will
 895          * attempt to set_geometry and recalibrate,
 896          * but for some reason these don't work at
 897          * this point (lost interrupt).
 898          */
 899         /*
 900          * Select the drive, and issue the SETFEATURES command
 901          */
 902         disable_irq_nosync(hwif->irq);
 903
 904         /*
 905          *      FIXME: we race against the running IRQ here if
 906          *      this is called from non IRQ context. If we use
 907          *      disable_irq() we hang on the error path. Work
 908          *      is needed.
 909          */
 910
 911         udelay(1);
 912         SELECT_DRIVE(drive);
 913         SELECT_MASK(drive, 0);
 914         udelay(1);
 915         if (IDE_CONTROL_REG)
 916                 hwif->OUTB(drive->ctl | 2, IDE_CONTROL_REG);
 917         hwif->OUTB(speed, IDE_NSECTOR_REG);
 918         hwif->OUTB(SETFEATURES_XFER, IDE_FEATURE_REG);
 919         hwif->OUTB(WIN_SETFEATURES, IDE_COMMAND_REG);
 920         if ((IDE_CONTROL_REG) && (drive->quirk_list == 2))
 921                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
 922         udelay(1);
 923         /*
 924          * Wait for drive to become non-BUSY
 925          */
 926         if ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 927                 unsigned long flags, timeout;
 928                 local_irq_set(flags);
 929                 timeout = jiffies + WAIT_CMD;
 930                 while ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 931                         if (time_after(jiffies, timeout))
 932                                 break;
 933                 }
 934                 local_irq_restore(flags);
 935         }
 936
 937         /*
 938          * Allow status to settle, then read it again.
 939          * A few rare drives vastly violate the 400ns spec here,
 940          * so we'll wait up to 10usec for a "good" status
 941          * rather than expensively fail things immediately.
 942          * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 943          */
 944         for (i = 0; i < 10; i++) {
 945                 udelay(1);
 946                 if (OK_STAT((stat = hwif->INB(IDE_STATUS_REG)), DRIVE_READY, BUSY_STAT|DRQ_STAT|ERR_STAT)) {
 947                         error = 0;
 948                         break;
 949                 }
 950         }
 951
 952         SELECT_MASK(drive, 0);
 953
 954         enable_irq(hwif->irq);
 955
 956         if (error) {
 957                 (void) ide_dump_status(drive, "set_drive_speed_status", stat);
 958                 return error;
 959         }
 960
 961         drive->id->dma_ultra &= ~0xFF00;
 962         drive->id->dma_mword &= ~0x0F00;
 963         drive->id->dma_1word &= ~0x0F00;
 964
 965 #ifdef CONFIG_BLK_DEV_IDEDMA
 966         if (speed >= XFER_SW_DMA_0)
 967                 hwif->ide_dma_host_on(drive);
 968         else if (hwif->ide_dma_check)   /* check if host supports DMA */
 969                 hwif->ide_dma_off_quietly(drive);
 970 #endif
 971
 972         switch(speed) {
 973                 case XFER_UDMA_7:   drive->id->dma_ultra |= 0x8080; break;
 974                 case XFER_UDMA_6:   drive->id->dma_ultra |= 0x4040; break;
 975                 case XFER_UDMA_5:   drive->id->dma_ultra |= 0x2020; break;
 976                 case XFER_UDMA_4:   drive->id->dma_ultra |= 0x1010; break;
 977                 case XFER_UDMA_3:   drive->id->dma_ultra |= 0x0808; break;
 978                 case XFER_UDMA_2:   drive->id->dma_ultra |= 0x0404; break;
 979                 case XFER_UDMA_1:   drive->id->dma_ultra |= 0x0202; break;
 980                 case XFER_UDMA_0:   drive->id->dma_ultra |= 0x0101; break;
 981                 case XFER_MW_DMA_2: drive->id->dma_mword |= 0x0404; break;
 982                 case XFER_MW_DMA_1: drive->id->dma_mword |= 0x0202; break;
 983                 case XFER_MW_DMA_0: drive->id->dma_mword |= 0x0101; break;
 984                 case XFER_SW_DMA_2: drive->id->dma_1word |= 0x0404; break;
 985                 case XFER_SW_DMA_1: drive->id->dma_1word |= 0x0202; break;
 986                 case XFER_SW_DMA_0: drive->id->dma_1word |= 0x0101; break;
 987                 default: break;
 988         }
 989         if (!drive->init_speed)
 990                 drive->init_speed = speed;
 991         drive->current_speed = speed;
 992         return error;
 993 }
 994
 995 EXPORT_SYMBOL(ide_config_drive_speed);
 996
 997
 998 /*
 999  * This should get invoked any time we exit the driver to
1000  * wait for an interrupt response from a drive.  handler() points
1001  * at the appropriate code to handle the next interrupt, and a
1002  * timer is started to prevent us from waiting forever in case
1003  * something goes wrong (see the ide_timer_expiry() handler later on).
1004  *
1005  * See also ide_execute_command
1006  */
1007 void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
1008                       unsigned int timeout, ide_expiry_t *expiry)
1009 {
1010         ide_hwgroup_t *hwgroup = HWGROUP(drive);
1011
1012         if (hwgroup->handler != NULL) {
1013                 printk(KERN_CRIT "%s: ide_set_handler: handler not null; "
1014                         "old=%p, new=%p\n",
1015                         drive->name, hwgroup->handler, handler);
1016         }
1017         hwgroup->handler        = handler;
1018         hwgroup->expiry         = expiry;
1019         hwgroup->timer.expires  = jiffies + timeout;
1020         add_timer(&hwgroup->timer);
1021 }
1022
1023 EXPORT_SYMBOL(__ide_set_handler);
1024
1025 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
1026                       unsigned int timeout, ide_expiry_t *expiry)
1027 {
1028         unsigned long flags;
1029         spin_lock_irqsave(&ide_lock, flags);
1030         __ide_set_handler(drive, handler, timeout, expiry);
1031         spin_unlock_irqrestore(&ide_lock, flags);
1032 }
1033
1034 EXPORT_SYMBOL(ide_set_handler);
1035
1036 /**
1037  *      ide_execute_command     -       execute an IDE command
1038  *      @drive: IDE drive to issue the command against
1039  *      @command: command byte to write
1040  *      @handler: handler for next phase
1041  *      @timeout: timeout for command
1042  *      @expiry:  handler to run on timeout
1043  *
1044  *      Helper function to issue an IDE command. This handles the
1045  *      atomicity requirements, command timing and ensures that the
1046  *      handler and IRQ setup do not race. All IDE command kick off
1047  *      should go via this function or do equivalent locking.
1048  */
1049
1050 void ide_execute_command(ide_drive_t *drive, task_ioreg_t cmd, ide_handler_t *handler, unsigned timeout, ide_expiry_t *expiry)
1051 {
1052         unsigned long flags;
1053         ide_hwgroup_t *hwgroup = HWGROUP(drive);
1054         ide_hwif_t *hwif = HWIF(drive);
1055
1056         spin_lock_irqsave(&ide_lock, flags);
1057
1058         if(hwgroup->handler)
1059                 BUG();
1060         hwgroup->handler        = handler;
1061         hwgroup->expiry         = expiry;
1062         hwgroup->timer.expires  = jiffies + timeout;
1063         add_timer(&hwgroup->timer);
1064         hwif->OUTBSYNC(drive, cmd, IDE_COMMAND_REG);
1065         /* Drive takes 400nS to respond, we must avoid the IRQ being
1066            serviced before that.
1067
1068            FIXME: we could skip this delay with care on non shared
1069            devices
1070         */
1071         ndelay(400);
1072         spin_unlock_irqrestore(&ide_lock, flags);
1073 }
1074
1075 EXPORT_SYMBOL(ide_execute_command);
1076
1077
1078 /* needed below */
1079 static ide_startstop_t do_reset1 (ide_drive_t *, int);
1080
1081 /*
1082  * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
1083  * during an atapi drive reset operation. If the drive has not yet responded,
1084  * and we have not yet hit our maximum waiting time, then the timer is restarted
1085  * for another 50ms.
1086  */
1087 static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
1088 {
1089         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
1090         ide_hwif_t *hwif        = HWIF(drive);
1091         u8 stat;
1092
1093         SELECT_DRIVE(drive);
1094         udelay (10);
1095
1096         if (OK_STAT(stat = hwif->INB(IDE_STATUS_REG), 0, BUSY_STAT)) {
1097                 printk("%s: ATAPI reset complete\n", drive->name);
1098         } else {
1099                 if (time_before(jiffies, hwgroup->poll_timeout)) {
1100                         if (HWGROUP(drive)->handler != NULL)
1101                                 BUG();
1102                         ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1103                         /* continue polling */
1104                         return ide_started;
1105                 }
1106                 /* end of polling */
1107                 hwgroup->poll_timeout = 0;
1108                 printk("%s: ATAPI reset timed-out, status=0x%02x\n",
1109                                 drive->name, stat);
1110                 /* do it the old fashioned way */
1111                 return do_reset1(drive, 1);
1112         }
1113         /* done polling */
1114         hwgroup->poll_timeout = 0;
1115         return ide_stopped;
1116 }
1117
1118 /*
1119  * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
1120  * during an ide reset operation. If the drives have not yet responded,
1121  * and we have not yet hit our maximum waiting time, then the timer is restarted
1122  * for another 50ms.
1123  */
1124 static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
1125 {
1126         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
1127         ide_hwif_t *hwif        = HWIF(drive);
1128         u8 tmp;
1129
1130         if (hwif->reset_poll != NULL) {
1131                 if (hwif->reset_poll(drive)) {
1132                         printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
1133                                 hwif->name, drive->name);
1134                         return ide_stopped;
1135                 }
1136         }
1137
1138         if (!OK_STAT(tmp = hwif->INB(IDE_STATUS_REG), 0, BUSY_STAT)) {
1139                 if (time_before(jiffies, hwgroup->poll_timeout)) {
1140                         if (HWGROUP(drive)->handler != NULL)
1141                                 BUG();
1142                         ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1143                         /* continue polling */
1144                         return ide_started;
1145                 }
1146                 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
1147                 drive->failures++;
1148         } else  {
1149                 printk("%s: reset: ", hwif->name);
1150                 if ((tmp = hwif->INB(IDE_ERROR_REG)) == 1) {
1151                         printk("success\n");
1152                         drive->failures = 0;
1153                 } else {
1154                         drive->failures++;
1155                         printk("master: ");
1156                         switch (tmp & 0x7f) {
1157                                 case 1: printk("passed");
1158                                         break;
1159                                 case 2: printk("formatter device error");
1160                                         break;
1161                                 case 3: printk("sector buffer error");
1162                                         break;
1163                                 case 4: printk("ECC circuitry error");
1164                                         break;
1165                                 case 5: printk("controlling MPU error");
1166                                         break;
1167                                 default:printk("error (0x%02x?)", tmp);
1168                         }
1169                         if (tmp & 0x80)
1170                                 printk("; slave: failed");
1171                         printk("\n");
1172                 }
1173         }
1174         hwgroup->poll_timeout = 0;      /* done polling */
1175         return ide_stopped;
1176 }
1177
1178 static void check_dma_crc(ide_drive_t *drive)
1179 {
1180 #ifdef CONFIG_BLK_DEV_IDEDMA
1181         if (drive->crc_count) {
1182                 (void) HWIF(drive)->ide_dma_off_quietly(drive);
1183                 ide_set_xfer_rate(drive, ide_auto_reduce_xfer(drive));
1184                 if (drive->current_speed >= XFER_SW_DMA_0)
1185                         (void) HWIF(drive)->ide_dma_on(drive);
1186         } else
1187                 (void)__ide_dma_off(drive);
1188 #endif
1189 }
1190
1191 void pre_reset (ide_drive_t *drive)
1192 {
1193         DRIVER(drive)->pre_reset(drive);
1194
1195         if (!drive->keep_settings) {
1196                 if (drive->using_dma) {
1197                         check_dma_crc(drive);
1198                 } else {
1199                         drive->unmask = 0;
1200                         drive->io_32bit = 0;
1201                 }
1202                 return;
1203         }
1204         if (drive->using_dma)
1205                 check_dma_crc(drive);
1206
1207         if (HWIF(drive)->pre_reset != NULL)
1208                 HWIF(drive)->pre_reset(drive);
1209
1210 }
1211
1212 /*
1213  * do_reset1() attempts to recover a confused drive by resetting it.
1214  * Unfortunately, resetting a disk drive actually resets all devices on
1215  * the same interface, so it can really be thought of as resetting the
1216  * interface rather than resetting the drive.
1217  *
1218  * ATAPI devices have their own reset mechanism which allows them to be
1219  * individually reset without clobbering other devices on the same interface.
1220  *
1221  * Unfortunately, the IDE interface does not generate an interrupt to let
1222  * us know when the reset operation has finished, so we must poll for this.
1223  * Equally poor, though, is the fact that this may a very long time to complete,
1224  * (up to 30 seconds worstcase).  So, instead of busy-waiting here for it,
1225  * we set a timer to poll at 50ms intervals.
1226  */
1227 static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
1228 {
1229         unsigned int unit;
1230         unsigned long flags;
1231         ide_hwif_t *hwif;
1232         ide_hwgroup_t *hwgroup;
1233
1234         spin_lock_irqsave(&ide_lock, flags);
1235         hwif = HWIF(drive);
1236         hwgroup = HWGROUP(drive);
1237
1238         /* We must not reset with running handlers */
1239         if(hwgroup->handler != NULL)
1240                 BUG();
1241
1242         /* For an ATAPI device, first try an ATAPI SRST. */
1243         if (drive->media != ide_disk && !do_not_try_atapi) {
1244                 pre_reset(drive);
1245                 SELECT_DRIVE(drive);
1246                 udelay (20);
1247                 hwif->OUTBSYNC(drive, WIN_SRST, IDE_COMMAND_REG);
1248                 ndelay(400);
1249                 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1250                 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1251                 spin_unlock_irqrestore(&ide_lock, flags);
1252                 return ide_started;
1253         }
1254
1255         /*
1256          * First, reset any device state data we were maintaining
1257          * for any of the drives on this interface.
1258          */
1259         for (unit = 0; unit < MAX_DRIVES; ++unit)
1260                 pre_reset(&hwif->drives[unit]);
1261
1262 #if OK_TO_RESET_CONTROLLER
1263         if (!IDE_CONTROL_REG) {
1264                 spin_unlock_irqrestore(&ide_lock, flags);
1265                 return ide_stopped;
1266         }
1267
1268         /*
1269          * Note that we also set nIEN while resetting the device,
1270          * to mask unwanted interrupts from the interface during the reset.
1271          * However, due to the design of PC hardware, this will cause an
1272          * immediate interrupt due to the edge transition it produces.
1273          * This single interrupt gives us a "fast poll" for drives that
1274          * recover from reset very quickly, saving us the first 50ms wait time.
1275          */
1276         /* set SRST and nIEN */
1277         hwif->OUTBSYNC(drive, drive->ctl|6,IDE_CONTROL_REG);
1278         /* more than enough time */
1279         udelay(10);
1280         if (drive->quirk_list == 2) {
1281                 /* clear SRST and nIEN */
1282                 hwif->OUTBSYNC(drive, drive->ctl, IDE_CONTROL_REG);
1283         } else {
1284                 /* clear SRST, leave nIEN */
1285                 hwif->OUTBSYNC(drive, drive->ctl|2, IDE_CONTROL_REG);
1286         }
1287         /* more than enough time */
1288         udelay(10);
1289         hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1290         __ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1291
1292         /*
1293          * Some weird controller like resetting themselves to a strange
1294          * state when the disks are reset this way. At least, the Winbond
1295          * 553 documentation says that
1296          */
1297         if (hwif->resetproc != NULL) {
1298                 hwif->resetproc(drive);
1299         }
1300
1301 #endif  /* OK_TO_RESET_CONTROLLER */
1302
1303         spin_unlock_irqrestore(&ide_lock, flags);
1304         return ide_started;
1305 }
1306
1307 /*
1308  * ide_do_reset() is the entry point to the drive/interface reset code.
1309  */
1310
1311 ide_startstop_t ide_do_reset (ide_drive_t *drive)
1312 {
1313         return do_reset1(drive, 0);
1314 }
1315
1316 EXPORT_SYMBOL(ide_do_reset);
1317
1318 /*
1319  * ide_wait_not_busy() waits for the currently selected device on the hwif
1320  * to report a non-busy status, see comments in probe_hwif().
1321  */
1322 int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
1323 {
1324         u8 stat = 0;
1325
1326         while(timeout--) {
1327                 /*
1328                  * Turn this into a schedule() sleep once I'm sure
1329                  * about locking issues (2.5 work ?).
1330                  */
1331                 mdelay(1);
1332                 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
1333                 if ((stat & BUSY_STAT) == 0)
1334                         return 0;
1335                 /*
1336                  * Assume a value of 0xff means nothing is connected to
1337                  * the interface and it doesn't implement the pull-down
1338                  * resistor on D7.
1339                  */
1340                 if (stat == 0xff)
1341                         return -ENODEV;
1342         }
1343         return -EBUSY;
1344 }
1345
1346 EXPORT_SYMBOL_GPL(ide_wait_not_busy);
1347