drivers/ide/ide-iops.c

   1 /*
   2  *  Copyright (C) 2000-2002     Andre Hedrick <andre@linux-ide.org>
   3  *  Copyright (C) 2003          Red Hat <alan@redhat.com>
   4  *
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/types.h>
   9 #include <linux/string.h>
  10 #include <linux/kernel.h>
  11 #include <linux/timer.h>
  12 #include <linux/mm.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/major.h>
  15 #include <linux/errno.h>
  16 #include <linux/genhd.h>
  17 #include <linux/blkpg.h>
  18 #include <linux/slab.h>
  19 #include <linux/pci.h>
  20 #include <linux/delay.h>
  21 #include <linux/hdreg.h>
  22 #include <linux/ide.h>
  23 #include <linux/bitops.h>
  24 #include <linux/nmi.h>
  25
  26 #include <asm/byteorder.h>
  27 #include <asm/irq.h>
  28 #include <asm/uaccess.h>
  29 #include <asm/io.h>
  30
  31 /*
  32  *      Conventional PIO operations for ATA devices
  33  */
  34
  35 static u8 ide_inb (unsigned long port)
  36 {
  37         return (u8) inb(port);
  38 }
  39
  40 static void ide_outb (u8 val, unsigned long port)
  41 {
  42         outb(val, port);
  43 }
  44
  45 static void ide_outbsync (ide_drive_t *drive, u8 addr, unsigned long port)
  46 {
  47         outb(addr, port);
  48 }
  49
  50 void default_hwif_iops (ide_hwif_t *hwif)
  51 {
  52         hwif->OUTB      = ide_outb;
  53         hwif->OUTBSYNC  = ide_outbsync;
  54         hwif->INB       = ide_inb;
  55 }
  56
  57 /*
  58  *      MMIO operations, typically used for SATA controllers
  59  */
  60
  61 static u8 ide_mm_inb (unsigned long port)
  62 {
  63         return (u8) readb((void __iomem *) port);
  64 }
  65
  66 static void ide_mm_outb (u8 value, unsigned long port)
  67 {
  68         writeb(value, (void __iomem *) port);
  69 }
  70
  71 static void ide_mm_outbsync (ide_drive_t *drive, u8 value, unsigned long port)
  72 {
  73         writeb(value, (void __iomem *) port);
  74 }
  75
  76 void default_hwif_mmiops (ide_hwif_t *hwif)
  77 {
  78         hwif->OUTB      = ide_mm_outb;
  79         /* Most systems will need to override OUTBSYNC, alas however
  80            this one is controller specific! */
  81         hwif->OUTBSYNC  = ide_mm_outbsync;
  82         hwif->INB       = ide_mm_inb;
  83 }
  84
  85 EXPORT_SYMBOL(default_hwif_mmiops);
  86
  87 void SELECT_DRIVE (ide_drive_t *drive)
  88 {
  89         ide_hwif_t *hwif = drive->hwif;
  90         const struct ide_port_ops *port_ops = hwif->port_ops;
  91
  92         if (port_ops && port_ops->selectproc)
  93                 port_ops->selectproc(drive);
  94
  95         hwif->OUTB(drive->select.all, hwif->io_ports.device_addr);
  96 }
  97
  98 void SELECT_MASK (ide_drive_t *drive, int mask)
  99 {
 100         const struct ide_port_ops *port_ops = drive->hwif->port_ops;
 101
 102         if (port_ops && port_ops->maskproc)
 103                 port_ops->maskproc(drive, mask);
 104 }
 105
 106 static void ide_tf_load(ide_drive_t *drive, ide_task_t *task)
 107 {
 108         ide_hwif_t *hwif = drive->hwif;
 109         struct ide_io_ports *io_ports = &hwif->io_ports;
 110         struct ide_taskfile *tf = &task->tf;
 111         void (*tf_outb)(u8 addr, unsigned long port);
 112         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 113         u8 HIHI = (task->tf_flags & IDE_TFLAG_LBA48) ? 0xE0 : 0xEF;
 114
 115         if (mmio)
 116                 tf_outb = ide_mm_outb;
 117         else
 118                 tf_outb = ide_outb;
 119
 120         if (task->tf_flags & IDE_TFLAG_FLAGGED)
 121                 HIHI = 0xFF;
 122
 123         ide_set_irq(drive, 1);
 124
 125         if ((task->tf_flags & IDE_TFLAG_NO_SELECT_MASK) == 0)
 126                 SELECT_MASK(drive, 0);
 127
 128         if (task->tf_flags & IDE_TFLAG_OUT_DATA) {
 129                 u16 data = (tf->hob_data << 8) | tf->data;
 130
 131                 if (mmio)
 132                         writew(data, (void __iomem *)io_ports->data_addr);
 133                 else
 134                         outw(data, io_ports->data_addr);
 135         }
 136
 137         if (task->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE)
 138                 tf_outb(tf->hob_feature, io_ports->feature_addr);
 139         if (task->tf_flags & IDE_TFLAG_OUT_HOB_NSECT)
 140                 tf_outb(tf->hob_nsect, io_ports->nsect_addr);
 141         if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAL)
 142                 tf_outb(tf->hob_lbal, io_ports->lbal_addr);
 143         if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAM)
 144                 tf_outb(tf->hob_lbam, io_ports->lbam_addr);
 145         if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAH)
 146                 tf_outb(tf->hob_lbah, io_ports->lbah_addr);
 147
 148         if (task->tf_flags & IDE_TFLAG_OUT_FEATURE)
 149                 tf_outb(tf->feature, io_ports->feature_addr);
 150         if (task->tf_flags & IDE_TFLAG_OUT_NSECT)
 151                 tf_outb(tf->nsect, io_ports->nsect_addr);
 152         if (task->tf_flags & IDE_TFLAG_OUT_LBAL)
 153                 tf_outb(tf->lbal, io_ports->lbal_addr);
 154         if (task->tf_flags & IDE_TFLAG_OUT_LBAM)
 155                 tf_outb(tf->lbam, io_ports->lbam_addr);
 156         if (task->tf_flags & IDE_TFLAG_OUT_LBAH)
 157                 tf_outb(tf->lbah, io_ports->lbah_addr);
 158
 159         if (task->tf_flags & IDE_TFLAG_OUT_DEVICE)
 160                 tf_outb((tf->device & HIHI) | drive->select.all,
 161                          io_ports->device_addr);
 162 }
 163
 164 static void ide_tf_read(ide_drive_t *drive, ide_task_t *task)
 165 {
 166         ide_hwif_t *hwif = drive->hwif;
 167         struct ide_io_ports *io_ports = &hwif->io_ports;
 168         struct ide_taskfile *tf = &task->tf;
 169         void (*tf_outb)(u8 addr, unsigned long port);
 170         u8 (*tf_inb)(unsigned long port);
 171         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 172
 173         if (mmio) {
 174                 tf_outb = ide_mm_outb;
 175                 tf_inb  = ide_mm_inb;
 176         } else {
 177                 tf_outb = ide_outb;
 178                 tf_inb  = ide_inb;
 179         }
 180
 181         if (task->tf_flags & IDE_TFLAG_IN_DATA) {
 182                 u16 data;
 183
 184                 if (mmio)
 185                         data = readw((void __iomem *)io_ports->data_addr);
 186                 else
 187                         data = inw(io_ports->data_addr);
 188
 189                 tf->data = data & 0xff;
 190                 tf->hob_data = (data >> 8) & 0xff;
 191         }
 192
 193         /* be sure we're looking at the low order bits */
 194         tf_outb(drive->ctl & ~0x80, io_ports->ctl_addr);
 195
 196         if (task->tf_flags & IDE_TFLAG_IN_NSECT)
 197                 tf->nsect  = tf_inb(io_ports->nsect_addr);
 198         if (task->tf_flags & IDE_TFLAG_IN_LBAL)
 199                 tf->lbal   = tf_inb(io_ports->lbal_addr);
 200         if (task->tf_flags & IDE_TFLAG_IN_LBAM)
 201                 tf->lbam   = tf_inb(io_ports->lbam_addr);
 202         if (task->tf_flags & IDE_TFLAG_IN_LBAH)
 203                 tf->lbah   = tf_inb(io_ports->lbah_addr);
 204         if (task->tf_flags & IDE_TFLAG_IN_DEVICE)
 205                 tf->device = tf_inb(io_ports->device_addr);
 206
 207         if (task->tf_flags & IDE_TFLAG_LBA48) {
 208                 tf_outb(drive->ctl | 0x80, io_ports->ctl_addr);
 209
 210                 if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
 211                         tf->hob_feature = tf_inb(io_ports->feature_addr);
 212                 if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
 213                         tf->hob_nsect   = tf_inb(io_ports->nsect_addr);
 214                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
 215                         tf->hob_lbal    = tf_inb(io_ports->lbal_addr);
 216                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
 217                         tf->hob_lbam    = tf_inb(io_ports->lbam_addr);
 218                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
 219                         tf->hob_lbah    = tf_inb(io_ports->lbah_addr);
 220         }
 221 }
 222
 223 /*
 224  * Some localbus EIDE interfaces require a special access sequence
 225  * when using 32-bit I/O instructions to transfer data.  We call this
 226  * the "vlb_sync" sequence, which consists of three successive reads
 227  * of the sector count register location, with interrupts disabled
 228  * to ensure that the reads all happen together.
 229  */
 230 static void ata_vlb_sync(unsigned long port)
 231 {
 232         (void)inb(port);
 233         (void)inb(port);
 234         (void)inb(port);
 235 }
 236
 237 /*
 238  * This is used for most PIO data transfers *from* the IDE interface
 239  *
 240  * These routines will round up any request for an odd number of bytes,
 241  * so if an odd len is specified, be sure that there's at least one
 242  * extra byte allocated for the buffer.
 243  */
 244 static void ata_input_data(ide_drive_t *drive, struct request *rq,
 245                            void *buf, unsigned int len)
 246 {
 247         ide_hwif_t *hwif = drive->hwif;
 248         struct ide_io_ports *io_ports = &hwif->io_ports;
 249         unsigned long data_addr = io_ports->data_addr;
 250         u8 io_32bit = drive->io_32bit;
 251         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 252
 253         len++;
 254
 255         if (io_32bit) {
 256                 unsigned long uninitialized_var(flags);
 257
 258                 if ((io_32bit & 2) && !mmio) {
 259                         local_irq_save(flags);
 260                         ata_vlb_sync(io_ports->nsect_addr);
 261                 }
 262
 263                 if (mmio)
 264                         __ide_mm_insl((void __iomem *)data_addr, buf, len / 4);
 265                 else
 266                         insl(data_addr, buf, len / 4);
 267
 268                 if ((io_32bit & 2) && !mmio)
 269                         local_irq_restore(flags);
 270
 271                 if ((len & 3) >= 2) {
 272                         if (mmio)
 273                                 __ide_mm_insw((void __iomem *)data_addr,
 274                                                 (u8 *)buf + (len & ~3), 1);
 275                         else
 276                                 insw(data_addr, (u8 *)buf + (len & ~3), 1);
 277                 }
 278         } else {
 279                 if (mmio)
 280                         __ide_mm_insw((void __iomem *)data_addr, buf, len / 2);
 281                 else
 282                         insw(data_addr, buf, len / 2);
 283         }
 284 }
 285
 286 /*
 287  * This is used for most PIO data transfers *to* the IDE interface
 288  */
 289 static void ata_output_data(ide_drive_t *drive, struct request *rq,
 290                             void *buf, unsigned int len)
 291 {
 292         ide_hwif_t *hwif = drive->hwif;
 293         struct ide_io_ports *io_ports = &hwif->io_ports;
 294         unsigned long data_addr = io_ports->data_addr;
 295         u8 io_32bit = drive->io_32bit;
 296         u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
 297
 298         if (io_32bit) {
 299                 unsigned long uninitialized_var(flags);
 300
 301                 if ((io_32bit & 2) && !mmio) {
 302                         local_irq_save(flags);
 303                         ata_vlb_sync(io_ports->nsect_addr);
 304                 }
 305
 306                 if (mmio)
 307                         __ide_mm_outsl((void __iomem *)data_addr, buf, len / 4);
 308                 else
 309                         outsl(data_addr, buf, len / 4);
 310
 311                 if ((io_32bit & 2) && !mmio)
 312                         local_irq_restore(flags);
 313
 314                 if ((len & 3) >= 2) {
 315                         if (mmio)
 316                                 __ide_mm_outsw((void __iomem *)data_addr,
 317                                                  (u8 *)buf + (len & ~3), 1);
 318                         else
 319                                 outsw(data_addr, (u8 *)buf + (len & ~3), 1);
 320                 }
 321         } else {
 322                 if (mmio)
 323                         __ide_mm_outsw((void __iomem *)data_addr, buf, len / 2);
 324                 else
 325                         outsw(data_addr, buf, len / 2);
 326         }
 327 }
 328
 329 void default_hwif_transport(ide_hwif_t *hwif)
 330 {
 331         hwif->tf_load     = ide_tf_load;
 332         hwif->tf_read     = ide_tf_read;
 333
 334         hwif->input_data  = ata_input_data;
 335         hwif->output_data = ata_output_data;
 336 }
 337
 338 void ide_fix_driveid (struct hd_driveid *id)
 339 {
 340 #ifndef __LITTLE_ENDIAN
 341 # ifdef __BIG_ENDIAN
 342         int i;
 343         u16 *stringcast;
 344
 345         id->config         = __le16_to_cpu(id->config);
 346         id->cyls           = __le16_to_cpu(id->cyls);
 347         id->reserved2      = __le16_to_cpu(id->reserved2);
 348         id->heads          = __le16_to_cpu(id->heads);
 349         id->track_bytes    = __le16_to_cpu(id->track_bytes);
 350         id->sector_bytes   = __le16_to_cpu(id->sector_bytes);
 351         id->sectors        = __le16_to_cpu(id->sectors);
 352         id->vendor0        = __le16_to_cpu(id->vendor0);
 353         id->vendor1        = __le16_to_cpu(id->vendor1);
 354         id->vendor2        = __le16_to_cpu(id->vendor2);
 355         stringcast = (u16 *)&id->serial_no[0];
 356         for (i = 0; i < (20/2); i++)
 357                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 358         id->buf_type       = __le16_to_cpu(id->buf_type);
 359         id->buf_size       = __le16_to_cpu(id->buf_size);
 360         id->ecc_bytes      = __le16_to_cpu(id->ecc_bytes);
 361         stringcast = (u16 *)&id->fw_rev[0];
 362         for (i = 0; i < (8/2); i++)
 363                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 364         stringcast = (u16 *)&id->model[0];
 365         for (i = 0; i < (40/2); i++)
 366                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 367         id->dword_io       = __le16_to_cpu(id->dword_io);
 368         id->reserved50     = __le16_to_cpu(id->reserved50);
 369         id->field_valid    = __le16_to_cpu(id->field_valid);
 370         id->cur_cyls       = __le16_to_cpu(id->cur_cyls);
 371         id->cur_heads      = __le16_to_cpu(id->cur_heads);
 372         id->cur_sectors    = __le16_to_cpu(id->cur_sectors);
 373         id->cur_capacity0  = __le16_to_cpu(id->cur_capacity0);
 374         id->cur_capacity1  = __le16_to_cpu(id->cur_capacity1);
 375         id->lba_capacity   = __le32_to_cpu(id->lba_capacity);
 376         id->dma_1word      = __le16_to_cpu(id->dma_1word);
 377         id->dma_mword      = __le16_to_cpu(id->dma_mword);
 378         id->eide_pio_modes = __le16_to_cpu(id->eide_pio_modes);
 379         id->eide_dma_min   = __le16_to_cpu(id->eide_dma_min);
 380         id->eide_dma_time  = __le16_to_cpu(id->eide_dma_time);
 381         id->eide_pio       = __le16_to_cpu(id->eide_pio);
 382         id->eide_pio_iordy = __le16_to_cpu(id->eide_pio_iordy);
 383         for (i = 0; i < 2; ++i)
 384                 id->words69_70[i] = __le16_to_cpu(id->words69_70[i]);
 385         for (i = 0; i < 4; ++i)
 386                 id->words71_74[i] = __le16_to_cpu(id->words71_74[i]);
 387         id->queue_depth    = __le16_to_cpu(id->queue_depth);
 388         for (i = 0; i < 4; ++i)
 389                 id->words76_79[i] = __le16_to_cpu(id->words76_79[i]);
 390         id->major_rev_num  = __le16_to_cpu(id->major_rev_num);
 391         id->minor_rev_num  = __le16_to_cpu(id->minor_rev_num);
 392         id->command_set_1  = __le16_to_cpu(id->command_set_1);
 393         id->command_set_2  = __le16_to_cpu(id->command_set_2);
 394         id->cfsse          = __le16_to_cpu(id->cfsse);
 395         id->cfs_enable_1   = __le16_to_cpu(id->cfs_enable_1);
 396         id->cfs_enable_2   = __le16_to_cpu(id->cfs_enable_2);
 397         id->csf_default    = __le16_to_cpu(id->csf_default);
 398         id->dma_ultra      = __le16_to_cpu(id->dma_ultra);
 399         id->trseuc         = __le16_to_cpu(id->trseuc);
 400         id->trsEuc         = __le16_to_cpu(id->trsEuc);
 401         id->CurAPMvalues   = __le16_to_cpu(id->CurAPMvalues);
 402         id->mprc           = __le16_to_cpu(id->mprc);
 403         id->hw_config      = __le16_to_cpu(id->hw_config);
 404         id->acoustic       = __le16_to_cpu(id->acoustic);
 405         id->msrqs          = __le16_to_cpu(id->msrqs);
 406         id->sxfert         = __le16_to_cpu(id->sxfert);
 407         id->sal            = __le16_to_cpu(id->sal);
 408         id->spg            = __le32_to_cpu(id->spg);
 409         id->lba_capacity_2 = __le64_to_cpu(id->lba_capacity_2);
 410         for (i = 0; i < 22; i++)
 411                 id->words104_125[i]   = __le16_to_cpu(id->words104_125[i]);
 412         id->last_lun       = __le16_to_cpu(id->last_lun);
 413         id->word127        = __le16_to_cpu(id->word127);
 414         id->dlf            = __le16_to_cpu(id->dlf);
 415         id->csfo           = __le16_to_cpu(id->csfo);
 416         for (i = 0; i < 26; i++)
 417                 id->words130_155[i] = __le16_to_cpu(id->words130_155[i]);
 418         id->word156        = __le16_to_cpu(id->word156);
 419         for (i = 0; i < 3; i++)
 420                 id->words157_159[i] = __le16_to_cpu(id->words157_159[i]);
 421         id->cfa_power      = __le16_to_cpu(id->cfa_power);
 422         for (i = 0; i < 14; i++)
 423                 id->words161_175[i] = __le16_to_cpu(id->words161_175[i]);
 424         for (i = 0; i < 31; i++)
 425                 id->words176_205[i] = __le16_to_cpu(id->words176_205[i]);
 426         for (i = 0; i < 48; i++)
 427                 id->words206_254[i] = __le16_to_cpu(id->words206_254[i]);
 428         id->integrity_word  = __le16_to_cpu(id->integrity_word);
 429 # else
 430 #  error "Please fix <asm/byteorder.h>"
 431 # endif
 432 #endif
 433 }
 434
 435 /*
 436  * ide_fixstring() cleans up and (optionally) byte-swaps a text string,
 437  * removing leading/trailing blanks and compressing internal blanks.
 438  * It is primarily used to tidy up the model name/number fields as
 439  * returned by the WIN_[P]IDENTIFY commands.
 440  */
 441
 442 void ide_fixstring (u8 *s, const int bytecount, const int byteswap)
 443 {
 444         u8 *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
 445
 446         if (byteswap) {
 447                 /* convert from big-endian to host byte order */
 448                 for (p = end ; p != s;) {
 449                         unsigned short *pp = (unsigned short *) (p -= 2);
 450                         *pp = ntohs(*pp);
 451                 }
 452         }
 453         /* strip leading blanks */
 454         while (s != end && *s == ' ')
 455                 ++s;
 456         /* compress internal blanks and strip trailing blanks */
 457         while (s != end && *s) {
 458                 if (*s++ != ' ' || (s != end && *s && *s != ' '))
 459                         *p++ = *(s-1);
 460         }
 461         /* wipe out trailing garbage */
 462         while (p != end)
 463                 *p++ = '\0';
 464 }
 465
 466 EXPORT_SYMBOL(ide_fixstring);
 467
 468 /*
 469  * Needed for PCI irq sharing
 470  */
 471 int drive_is_ready (ide_drive_t *drive)
 472 {
 473         ide_hwif_t *hwif        = HWIF(drive);
 474         u8 stat                 = 0;
 475
 476         if (drive->waiting_for_dma)
 477                 return hwif->dma_ops->dma_test_irq(drive);
 478
 479 #if 0
 480         /* need to guarantee 400ns since last command was issued */
 481         udelay(1);
 482 #endif
 483
 484         /*
 485          * We do a passive status test under shared PCI interrupts on
 486          * cards that truly share the ATA side interrupt, but may also share
 487          * an interrupt with another pci card/device.  We make no assumptions
 488          * about possible isa-pnp and pci-pnp issues yet.
 489          */
 490         if (hwif->io_ports.ctl_addr)
 491                 stat = ide_read_altstatus(drive);
 492         else
 493                 /* Note: this may clear a pending IRQ!! */
 494                 stat = ide_read_status(drive);
 495
 496         if (stat & BUSY_STAT)
 497                 /* drive busy:  definitely not interrupting */
 498                 return 0;
 499
 500         /* drive ready: *might* be interrupting */
 501         return 1;
 502 }
 503
 504 EXPORT_SYMBOL(drive_is_ready);
 505
 506 /*
 507  * This routine busy-waits for the drive status to be not "busy".
 508  * It then checks the status for all of the "good" bits and none
 509  * of the "bad" bits, and if all is okay it returns 0.  All other
 510  * cases return error -- caller may then invoke ide_error().
 511  *
 512  * This routine should get fixed to not hog the cpu during extra long waits..
 513  * That could be done by busy-waiting for the first jiffy or two, and then
 514  * setting a timer to wake up at half second intervals thereafter,
 515  * until timeout is achieved, before timing out.
 516  */
 517 static int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout, u8 *rstat)
 518 {
 519         unsigned long flags;
 520         int i;
 521         u8 stat;
 522
 523         udelay(1);      /* spec allows drive 400ns to assert "BUSY" */
 524         stat = ide_read_status(drive);
 525
 526         if (stat & BUSY_STAT) {
 527                 local_irq_set(flags);
 528                 timeout += jiffies;
 529                 while ((stat = ide_read_status(drive)) & BUSY_STAT) {
 530                         if (time_after(jiffies, timeout)) {
 531                                 /*
 532                                  * One last read after the timeout in case
 533                                  * heavy interrupt load made us not make any
 534                                  * progress during the timeout..
 535                                  */
 536                                 stat = ide_read_status(drive);
 537                                 if (!(stat & BUSY_STAT))
 538                                         break;
 539
 540                                 local_irq_restore(flags);
 541                                 *rstat = stat;
 542                                 return -EBUSY;
 543                         }
 544                 }
 545                 local_irq_restore(flags);
 546         }
 547         /*
 548          * Allow status to settle, then read it again.
 549          * A few rare drives vastly violate the 400ns spec here,
 550          * so we'll wait up to 10usec for a "good" status
 551          * rather than expensively fail things immediately.
 552          * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 553          */
 554         for (i = 0; i < 10; i++) {
 555                 udelay(1);
 556                 stat = ide_read_status(drive);
 557
 558                 if (OK_STAT(stat, good, bad)) {
 559                         *rstat = stat;
 560                         return 0;
 561                 }
 562         }
 563         *rstat = stat;
 564         return -EFAULT;
 565 }
 566
 567 /*
 568  * In case of error returns error value after doing "*startstop = ide_error()".
 569  * The caller should return the updated value of "startstop" in this case,
 570  * "startstop" is unchanged when the function returns 0.
 571  */
 572 int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout)
 573 {
 574         int err;
 575         u8 stat;
 576
 577         /* bail early if we've exceeded max_failures */
 578         if (drive->max_failures && (drive->failures > drive->max_failures)) {
 579                 *startstop = ide_stopped;
 580                 return 1;
 581         }
 582
 583         err = __ide_wait_stat(drive, good, bad, timeout, &stat);
 584
 585         if (err) {
 586                 char *s = (err == -EBUSY) ? "status timeout" : "status error";
 587                 *startstop = ide_error(drive, s, stat);
 588         }
 589
 590         return err;
 591 }
 592
 593 EXPORT_SYMBOL(ide_wait_stat);
 594
 595 /**
 596  *      ide_in_drive_list       -       look for drive in black/white list
 597  *      @id: drive identifier
 598  *      @drive_table: list to inspect
 599  *
 600  *      Look for a drive in the blacklist and the whitelist tables
 601  *      Returns 1 if the drive is found in the table.
 602  */
 603
 604 int ide_in_drive_list(struct hd_driveid *id, const struct drive_list_entry *drive_table)
 605 {
 606         for ( ; drive_table->id_model; drive_table++)
 607                 if ((!strcmp(drive_table->id_model, id->model)) &&
 608                     (!drive_table->id_firmware ||
 609                      strstr(id->fw_rev, drive_table->id_firmware)))
 610                         return 1;
 611         return 0;
 612 }
 613
 614 EXPORT_SYMBOL_GPL(ide_in_drive_list);
 615
 616 /*
 617  * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid.
 618  * We list them here and depend on the device side cable detection for them.
 619  *
 620  * Some optical devices with the buggy firmwares have the same problem.
 621  */
 622 static const struct drive_list_entry ivb_list[] = {
 623         { "QUANTUM FIREBALLlct10 05"    , "A03.0900"    },
 624         { "TSSTcorp CDDVDW SH-S202J"    , "SB00"        },
 625         { "TSSTcorp CDDVDW SH-S202J"    , "SB01"        },
 626         { "TSSTcorp CDDVDW SH-S202N"    , "SB00"        },
 627         { "TSSTcorp CDDVDW SH-S202N"    , "SB01"        },
 628         { NULL                          , NULL          }
 629 };
 630
 631 /*
 632  *  All hosts that use the 80c ribbon must use!
 633  *  The name is derived from upper byte of word 93 and the 80c ribbon.
 634  */
 635 u8 eighty_ninty_three (ide_drive_t *drive)
 636 {
 637         ide_hwif_t *hwif = drive->hwif;
 638         struct hd_driveid *id = drive->id;
 639         int ivb = ide_in_drive_list(id, ivb_list);
 640
 641         if (hwif->cbl == ATA_CBL_PATA40_SHORT)
 642                 return 1;
 643
 644         if (ivb)
 645                 printk(KERN_DEBUG "%s: skipping word 93 validity check\n",
 646                                   drive->name);
 647
 648         if (ide_dev_is_sata(id) && !ivb)
 649                 return 1;
 650
 651         if (hwif->cbl != ATA_CBL_PATA80 && !ivb)
 652                 goto no_80w;
 653
 654         /*
 655          * FIXME:
 656          * - change master/slave IDENTIFY order
 657          * - force bit13 (80c cable present) check also for !ivb devices
 658          *   (unless the slave device is pre-ATA3)
 659          */
 660         if ((id->hw_config & 0x4000) || (ivb && (id->hw_config & 0x2000)))
 661                 return 1;
 662
 663 no_80w:
 664         if (drive->udma33_warned == 1)
 665                 return 0;
 666
 667         printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, "
 668                             "limiting max speed to UDMA33\n",
 669                             drive->name,
 670                             hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host");
 671
 672         drive->udma33_warned = 1;
 673
 674         return 0;
 675 }
 676
 677 int ide_driveid_update(ide_drive_t *drive)
 678 {
 679         ide_hwif_t *hwif = drive->hwif;
 680         struct hd_driveid *id;
 681         unsigned long timeout, flags;
 682         u8 stat;
 683
 684         /*
 685          * Re-read drive->id for possible DMA mode
 686          * change (copied from ide-probe.c)
 687          */
 688
 689         SELECT_MASK(drive, 1);
 690         ide_set_irq(drive, 1);
 691         msleep(50);
 692         hwif->OUTBSYNC(drive, WIN_IDENTIFY, hwif->io_ports.command_addr);
 693         timeout = jiffies + WAIT_WORSTCASE;
 694         do {
 695                 if (time_after(jiffies, timeout)) {
 696                         SELECT_MASK(drive, 0);
 697                         return 0;       /* drive timed-out */
 698                 }
 699
 700                 msleep(50);     /* give drive a breather */
 701                 stat = ide_read_altstatus(drive);
 702         } while (stat & BUSY_STAT);
 703
 704         msleep(50);     /* wait for IRQ and DRQ_STAT */
 705         stat = ide_read_status(drive);
 706
 707         if (!OK_STAT(stat, DRQ_STAT, BAD_R_STAT)) {
 708                 SELECT_MASK(drive, 0);
 709                 printk("%s: CHECK for good STATUS\n", drive->name);
 710                 return 0;
 711         }
 712         local_irq_save(flags);
 713         SELECT_MASK(drive, 0);
 714         id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
 715         if (!id) {
 716                 local_irq_restore(flags);
 717                 return 0;
 718         }
 719         hwif->input_data(drive, NULL, id, SECTOR_SIZE);
 720         (void)ide_read_status(drive);   /* clear drive IRQ */
 721         local_irq_enable();
 722         local_irq_restore(flags);
 723         ide_fix_driveid(id);
 724         if (id) {
 725                 drive->id->dma_ultra = id->dma_ultra;
 726                 drive->id->dma_mword = id->dma_mword;
 727                 drive->id->dma_1word = id->dma_1word;
 728                 /* anything more ? */
 729                 kfree(id);
 730
 731                 if (drive->using_dma && ide_id_dma_bug(drive))
 732                         ide_dma_off(drive);
 733         }
 734
 735         return 1;
 736 }
 737
 738 int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
 739 {
 740         ide_hwif_t *hwif = drive->hwif;
 741         struct ide_io_ports *io_ports = &hwif->io_ports;
 742         int error = 0;
 743         u8 stat;
 744
 745 //      while (HWGROUP(drive)->busy)
 746 //              msleep(50);
 747
 748 #ifdef CONFIG_BLK_DEV_IDEDMA
 749         if (hwif->dma_ops)      /* check if host supports DMA */
 750                 hwif->dma_ops->dma_host_set(drive, 0);
 751 #endif
 752
 753         /* Skip setting PIO flow-control modes on pre-EIDE drives */
 754         if ((speed & 0xf8) == XFER_PIO_0 && !(drive->id->capability & 0x08))
 755                 goto skip;
 756
 757         /*
 758          * Don't use ide_wait_cmd here - it will
 759          * attempt to set_geometry and recalibrate,
 760          * but for some reason these don't work at
 761          * this point (lost interrupt).
 762          */
 763         /*
 764          * Select the drive, and issue the SETFEATURES command
 765          */
 766         disable_irq_nosync(hwif->irq);
 767
 768         /*
 769          *      FIXME: we race against the running IRQ here if
 770          *      this is called from non IRQ context. If we use
 771          *      disable_irq() we hang on the error path. Work
 772          *      is needed.
 773          */
 774
 775         udelay(1);
 776         SELECT_DRIVE(drive);
 777         SELECT_MASK(drive, 0);
 778         udelay(1);
 779         ide_set_irq(drive, 0);
 780         hwif->OUTB(speed, io_ports->nsect_addr);
 781         hwif->OUTB(SETFEATURES_XFER, io_ports->feature_addr);
 782         hwif->OUTBSYNC(drive, WIN_SETFEATURES, io_ports->command_addr);
 783         if (drive->quirk_list == 2)
 784                 ide_set_irq(drive, 1);
 785
 786         error = __ide_wait_stat(drive, drive->ready_stat,
 787                                 BUSY_STAT|DRQ_STAT|ERR_STAT,
 788                                 WAIT_CMD, &stat);
 789
 790         SELECT_MASK(drive, 0);
 791
 792         enable_irq(hwif->irq);
 793
 794         if (error) {
 795                 (void) ide_dump_status(drive, "set_drive_speed_status", stat);
 796                 return error;
 797         }
 798
 799         drive->id->dma_ultra &= ~0xFF00;
 800         drive->id->dma_mword &= ~0x0F00;
 801         drive->id->dma_1word &= ~0x0F00;
 802
 803  skip:
 804 #ifdef CONFIG_BLK_DEV_IDEDMA
 805         if ((speed >= XFER_SW_DMA_0 || (hwif->host_flags & IDE_HFLAG_VDMA)) &&
 806             drive->using_dma)
 807                 hwif->dma_ops->dma_host_set(drive, 1);
 808         else if (hwif->dma_ops) /* check if host supports DMA */
 809                 ide_dma_off_quietly(drive);
 810 #endif
 811
 812         switch(speed) {
 813                 case XFER_UDMA_7:   drive->id->dma_ultra |= 0x8080; break;
 814                 case XFER_UDMA_6:   drive->id->dma_ultra |= 0x4040; break;
 815                 case XFER_UDMA_5:   drive->id->dma_ultra |= 0x2020; break;
 816                 case XFER_UDMA_4:   drive->id->dma_ultra |= 0x1010; break;
 817                 case XFER_UDMA_3:   drive->id->dma_ultra |= 0x0808; break;
 818                 case XFER_UDMA_2:   drive->id->dma_ultra |= 0x0404; break;
 819                 case XFER_UDMA_1:   drive->id->dma_ultra |= 0x0202; break;
 820                 case XFER_UDMA_0:   drive->id->dma_ultra |= 0x0101; break;
 821                 case XFER_MW_DMA_2: drive->id->dma_mword |= 0x0404; break;
 822                 case XFER_MW_DMA_1: drive->id->dma_mword |= 0x0202; break;
 823                 case XFER_MW_DMA_0: drive->id->dma_mword |= 0x0101; break;
 824                 case XFER_SW_DMA_2: drive->id->dma_1word |= 0x0404; break;
 825                 case XFER_SW_DMA_1: drive->id->dma_1word |= 0x0202; break;
 826                 case XFER_SW_DMA_0: drive->id->dma_1word |= 0x0101; break;
 827                 default: break;
 828         }
 829         if (!drive->init_speed)
 830                 drive->init_speed = speed;
 831         drive->current_speed = speed;
 832         return error;
 833 }
 834
 835 /*
 836  * This should get invoked any time we exit the driver to
 837  * wait for an interrupt response from a drive.  handler() points
 838  * at the appropriate code to handle the next interrupt, and a
 839  * timer is started to prevent us from waiting forever in case
 840  * something goes wrong (see the ide_timer_expiry() handler later on).
 841  *
 842  * See also ide_execute_command
 843  */
 844 static void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 845                       unsigned int timeout, ide_expiry_t *expiry)
 846 {
 847         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 848
 849         BUG_ON(hwgroup->handler);
 850         hwgroup->handler        = handler;
 851         hwgroup->expiry         = expiry;
 852         hwgroup->timer.expires  = jiffies + timeout;
 853         hwgroup->req_gen_timer  = hwgroup->req_gen;
 854         add_timer(&hwgroup->timer);
 855 }
 856
 857 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 858                       unsigned int timeout, ide_expiry_t *expiry)
 859 {
 860         unsigned long flags;
 861         spin_lock_irqsave(&ide_lock, flags);
 862         __ide_set_handler(drive, handler, timeout, expiry);
 863         spin_unlock_irqrestore(&ide_lock, flags);
 864 }
 865
 866 EXPORT_SYMBOL(ide_set_handler);
 867
 868 /**
 869  *      ide_execute_command     -       execute an IDE command
 870  *      @drive: IDE drive to issue the command against
 871  *      @command: command byte to write
 872  *      @handler: handler for next phase
 873  *      @timeout: timeout for command
 874  *      @expiry:  handler to run on timeout
 875  *
 876  *      Helper function to issue an IDE command. This handles the
 877  *      atomicity requirements, command timing and ensures that the
 878  *      handler and IRQ setup do not race. All IDE command kick off
 879  *      should go via this function or do equivalent locking.
 880  */
 881
 882 void ide_execute_command(ide_drive_t *drive, u8 cmd, ide_handler_t *handler,
 883                          unsigned timeout, ide_expiry_t *expiry)
 884 {
 885         unsigned long flags;
 886         ide_hwif_t *hwif = HWIF(drive);
 887
 888         spin_lock_irqsave(&ide_lock, flags);
 889         __ide_set_handler(drive, handler, timeout, expiry);
 890         hwif->OUTBSYNC(drive, cmd, hwif->io_ports.command_addr);
 891         /*
 892          * Drive takes 400nS to respond, we must avoid the IRQ being
 893          * serviced before that.
 894          *
 895          * FIXME: we could skip this delay with care on non shared devices
 896          */
 897         ndelay(400);
 898         spin_unlock_irqrestore(&ide_lock, flags);
 899 }
 900 EXPORT_SYMBOL(ide_execute_command);
 901
 902 void ide_execute_pkt_cmd(ide_drive_t *drive)
 903 {
 904         ide_hwif_t *hwif = drive->hwif;
 905         unsigned long flags;
 906
 907         spin_lock_irqsave(&ide_lock, flags);
 908         hwif->OUTBSYNC(drive, WIN_PACKETCMD, hwif->io_ports.command_addr);
 909         ndelay(400);
 910         spin_unlock_irqrestore(&ide_lock, flags);
 911 }
 912 EXPORT_SYMBOL_GPL(ide_execute_pkt_cmd);
 913
 914 /* needed below */
 915 static ide_startstop_t do_reset1 (ide_drive_t *, int);
 916
 917 /*
 918  * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 919  * during an atapi drive reset operation. If the drive has not yet responded,
 920  * and we have not yet hit our maximum waiting time, then the timer is restarted
 921  * for another 50ms.
 922  */
 923 static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
 924 {
 925         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
 926         u8 stat;
 927
 928         SELECT_DRIVE(drive);
 929         udelay (10);
 930         stat = ide_read_status(drive);
 931
 932         if (OK_STAT(stat, 0, BUSY_STAT))
 933                 printk("%s: ATAPI reset complete\n", drive->name);
 934         else {
 935                 if (time_before(jiffies, hwgroup->poll_timeout)) {
 936                         ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
 937                         /* continue polling */
 938                         return ide_started;
 939                 }
 940                 /* end of polling */
 941                 hwgroup->polling = 0;
 942                 printk("%s: ATAPI reset timed-out, status=0x%02x\n",
 943                                 drive->name, stat);
 944                 /* do it the old fashioned way */
 945                 return do_reset1(drive, 1);
 946         }
 947         /* done polling */
 948         hwgroup->polling = 0;
 949         hwgroup->resetting = 0;
 950         return ide_stopped;
 951 }
 952
 953 /*
 954  * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 955  * during an ide reset operation. If the drives have not yet responded,
 956  * and we have not yet hit our maximum waiting time, then the timer is restarted
 957  * for another 50ms.
 958  */
 959 static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
 960 {
 961         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
 962         ide_hwif_t *hwif        = HWIF(drive);
 963         const struct ide_port_ops *port_ops = hwif->port_ops;
 964         u8 tmp;
 965
 966         if (port_ops && port_ops->reset_poll) {
 967                 if (port_ops->reset_poll(drive)) {
 968                         printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
 969                                 hwif->name, drive->name);
 970                         return ide_stopped;
 971                 }
 972         }
 973
 974         tmp = ide_read_status(drive);
 975
 976         if (!OK_STAT(tmp, 0, BUSY_STAT)) {
 977                 if (time_before(jiffies, hwgroup->poll_timeout)) {
 978                         ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
 979                         /* continue polling */
 980                         return ide_started;
 981                 }
 982                 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
 983                 drive->failures++;
 984         } else  {
 985                 printk("%s: reset: ", hwif->name);
 986                 tmp = ide_read_error(drive);
 987
 988                 if (tmp == 1) {
 989                         printk("success\n");
 990                         drive->failures = 0;
 991                 } else {
 992                         drive->failures++;
 993                         printk("master: ");
 994                         switch (tmp & 0x7f) {
 995                                 case 1: printk("passed");
 996                                         break;
 997                                 case 2: printk("formatter device error");
 998                                         break;
 999                                 case 3: printk("sector buffer error");
1000                                         break;
1001                                 case 4: printk("ECC circuitry error");
1002                                         break;
1003                                 case 5: printk("controlling MPU error");
1004                                         break;
1005                                 default:printk("error (0x%02x?)", tmp);
1006                         }
1007                         if (tmp & 0x80)
1008                                 printk("; slave: failed");
1009                         printk("\n");
1010                 }
1011         }
1012         hwgroup->polling = 0;   /* done polling */
1013         hwgroup->resetting = 0; /* done reset attempt */
1014         return ide_stopped;
1015 }
1016
1017 static void ide_disk_pre_reset(ide_drive_t *drive)
1018 {
1019         int legacy = (drive->id->cfs_enable_2 & 0x0400) ? 0 : 1;
1020
1021         drive->special.all = 0;
1022         drive->special.b.set_geometry = legacy;
1023         drive->special.b.recalibrate  = legacy;
1024         drive->mult_count = 0;
1025         if (!drive->keep_settings && !drive->using_dma)
1026                 drive->mult_req = 0;
1027         if (drive->mult_req != drive->mult_count)
1028                 drive->special.b.set_multmode = 1;
1029 }
1030
1031 static void pre_reset(ide_drive_t *drive)
1032 {
1033         const struct ide_port_ops *port_ops = drive->hwif->port_ops;
1034
1035         if (drive->media == ide_disk)
1036                 ide_disk_pre_reset(drive);
1037         else
1038                 drive->post_reset = 1;
1039
1040         if (drive->using_dma) {
1041                 if (drive->crc_count)
1042                         ide_check_dma_crc(drive);
1043                 else
1044                         ide_dma_off(drive);
1045         }
1046
1047         if (!drive->keep_settings) {
1048                 if (!drive->using_dma) {
1049                         drive->unmask = 0;
1050                         drive->io_32bit = 0;
1051                 }
1052                 return;
1053         }
1054
1055         if (port_ops && port_ops->pre_reset)
1056                 port_ops->pre_reset(drive);
1057
1058         if (drive->current_speed != 0xff)
1059                 drive->desired_speed = drive->current_speed;
1060         drive->current_speed = 0xff;
1061 }
1062
1063 /*
1064  * do_reset1() attempts to recover a confused drive by resetting it.
1065  * Unfortunately, resetting a disk drive actually resets all devices on
1066  * the same interface, so it can really be thought of as resetting the
1067  * interface rather than resetting the drive.
1068  *
1069  * ATAPI devices have their own reset mechanism which allows them to be
1070  * individually reset without clobbering other devices on the same interface.
1071  *
1072  * Unfortunately, the IDE interface does not generate an interrupt to let
1073  * us know when the reset operation has finished, so we must poll for this.
1074  * Equally poor, though, is the fact that this may a very long time to complete,
1075  * (up to 30 seconds worstcase).  So, instead of busy-waiting here for it,
1076  * we set a timer to poll at 50ms intervals.
1077  */
1078 static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
1079 {
1080         unsigned int unit;
1081         unsigned long flags;
1082         ide_hwif_t *hwif;
1083         ide_hwgroup_t *hwgroup;
1084         struct ide_io_ports *io_ports;
1085         const struct ide_port_ops *port_ops;
1086         u8 ctl;
1087
1088         spin_lock_irqsave(&ide_lock, flags);
1089         hwif = HWIF(drive);
1090         hwgroup = HWGROUP(drive);
1091
1092         io_ports = &hwif->io_ports;
1093
1094         /* We must not reset with running handlers */
1095         BUG_ON(hwgroup->handler != NULL);
1096
1097         /* For an ATAPI device, first try an ATAPI SRST. */
1098         if (drive->media != ide_disk && !do_not_try_atapi) {
1099                 hwgroup->resetting = 1;
1100                 pre_reset(drive);
1101                 SELECT_DRIVE(drive);
1102                 udelay (20);
1103                 hwif->OUTBSYNC(drive, WIN_SRST, io_ports->command_addr);
1104                 ndelay(400);
1105                 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1106                 hwgroup->polling = 1;
1107                 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1108                 spin_unlock_irqrestore(&ide_lock, flags);
1109                 return ide_started;
1110         }
1111
1112         /*
1113          * First, reset any device state data we were maintaining
1114          * for any of the drives on this interface.
1115          */
1116         for (unit = 0; unit < MAX_DRIVES; ++unit)
1117                 pre_reset(&hwif->drives[unit]);
1118
1119         if (io_ports->ctl_addr == 0) {
1120                 spin_unlock_irqrestore(&ide_lock, flags);
1121                 return ide_stopped;
1122         }
1123
1124         hwgroup->resetting = 1;
1125         /*
1126          * Note that we also set nIEN while resetting the device,
1127          * to mask unwanted interrupts from the interface during the reset.
1128          * However, due to the design of PC hardware, this will cause an
1129          * immediate interrupt due to the edge transition it produces.
1130          * This single interrupt gives us a "fast poll" for drives that
1131          * recover from reset very quickly, saving us the first 50ms wait time.
1132          */
1133         /* set SRST and nIEN */
1134         hwif->OUTBSYNC(drive, drive->ctl|6, io_ports->ctl_addr);
1135         /* more than enough time */
1136         udelay(10);
1137         if (drive->quirk_list == 2)
1138                 ctl = drive->ctl;       /* clear SRST and nIEN */
1139         else
1140                 ctl = drive->ctl | 2;   /* clear SRST, leave nIEN */
1141         hwif->OUTBSYNC(drive, ctl, io_ports->ctl_addr);
1142         /* more than enough time */
1143         udelay(10);
1144         hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1145         hwgroup->polling = 1;
1146         __ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1147
1148         /*
1149          * Some weird controller like resetting themselves to a strange
1150          * state when the disks are reset this way. At least, the Winbond
1151          * 553 documentation says that
1152          */
1153         port_ops = hwif->port_ops;
1154         if (port_ops && port_ops->resetproc)
1155                 port_ops->resetproc(drive);
1156
1157         spin_unlock_irqrestore(&ide_lock, flags);
1158         return ide_started;
1159 }
1160
1161 /*
1162  * ide_do_reset() is the entry point to the drive/interface reset code.
1163  */
1164
1165 ide_startstop_t ide_do_reset (ide_drive_t *drive)
1166 {
1167         return do_reset1(drive, 0);
1168 }
1169
1170 EXPORT_SYMBOL(ide_do_reset);
1171
1172 /*
1173  * ide_wait_not_busy() waits for the currently selected device on the hwif
1174  * to report a non-busy status, see comments in ide_probe_port().
1175  */
1176 int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
1177 {
1178         u8 stat = 0;
1179
1180         while(timeout--) {
1181                 /*
1182                  * Turn this into a schedule() sleep once I'm sure
1183                  * about locking issues (2.5 work ?).
1184                  */
1185                 mdelay(1);
1186                 stat = hwif->INB(hwif->io_ports.status_addr);
1187                 if ((stat & BUSY_STAT) == 0)
1188                         return 0;
1189                 /*
1190                  * Assume a value of 0xff means nothing is connected to
1191                  * the interface and it doesn't implement the pull-down
1192                  * resistor on D7.
1193                  */
1194                 if (stat == 0xff)
1195                         return -ENODEV;
1196                 touch_softlockup_watchdog();
1197                 touch_nmi_watchdog();
1198         }
1199         return -EBUSY;
1200 }
1201
1202 EXPORT_SYMBOL_GPL(ide_wait_not_busy);
1203