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 u16 ide_inw (unsigned long port)
  41 {
  42         return (u16) inw(port);
  43 }
  44
  45 static void ide_insw (unsigned long port, void *addr, u32 count)
  46 {
  47         insw(port, addr, count);
  48 }
  49
  50 static void ide_insl (unsigned long port, void *addr, u32 count)
  51 {
  52         insl(port, addr, count);
  53 }
  54
  55 static void ide_outb (u8 val, unsigned long port)
  56 {
  57         outb(val, port);
  58 }
  59
  60 static void ide_outbsync (ide_drive_t *drive, u8 addr, unsigned long port)
  61 {
  62         outb(addr, port);
  63 }
  64
  65 static void ide_outw (u16 val, unsigned long port)
  66 {
  67         outw(val, port);
  68 }
  69
  70 static void ide_outsw (unsigned long port, void *addr, u32 count)
  71 {
  72         outsw(port, addr, count);
  73 }
  74
  75 static void ide_outsl (unsigned long port, void *addr, u32 count)
  76 {
  77         outsl(port, addr, count);
  78 }
  79
  80 void default_hwif_iops (ide_hwif_t *hwif)
  81 {
  82         hwif->OUTB      = ide_outb;
  83         hwif->OUTBSYNC  = ide_outbsync;
  84         hwif->OUTW      = ide_outw;
  85         hwif->OUTSW     = ide_outsw;
  86         hwif->OUTSL     = ide_outsl;
  87         hwif->INB       = ide_inb;
  88         hwif->INW       = ide_inw;
  89         hwif->INSW      = ide_insw;
  90         hwif->INSL      = ide_insl;
  91 }
  92
  93 /*
  94  *      MMIO operations, typically used for SATA controllers
  95  */
  96
  97 static u8 ide_mm_inb (unsigned long port)
  98 {
  99         return (u8) readb((void __iomem *) port);
 100 }
 101
 102 static u16 ide_mm_inw (unsigned long port)
 103 {
 104         return (u16) readw((void __iomem *) port);
 105 }
 106
 107 static void ide_mm_insw (unsigned long port, void *addr, u32 count)
 108 {
 109         __ide_mm_insw((void __iomem *) port, addr, count);
 110 }
 111
 112 static void ide_mm_insl (unsigned long port, void *addr, u32 count)
 113 {
 114         __ide_mm_insl((void __iomem *) port, addr, count);
 115 }
 116
 117 static void ide_mm_outb (u8 value, unsigned long port)
 118 {
 119         writeb(value, (void __iomem *) port);
 120 }
 121
 122 static void ide_mm_outbsync (ide_drive_t *drive, u8 value, unsigned long port)
 123 {
 124         writeb(value, (void __iomem *) port);
 125 }
 126
 127 static void ide_mm_outw (u16 value, unsigned long port)
 128 {
 129         writew(value, (void __iomem *) port);
 130 }
 131
 132 static void ide_mm_outsw (unsigned long port, void *addr, u32 count)
 133 {
 134         __ide_mm_outsw((void __iomem *) port, addr, count);
 135 }
 136
 137 static void ide_mm_outsl (unsigned long port, void *addr, u32 count)
 138 {
 139         __ide_mm_outsl((void __iomem *) port, addr, count);
 140 }
 141
 142 void default_hwif_mmiops (ide_hwif_t *hwif)
 143 {
 144         hwif->OUTB      = ide_mm_outb;
 145         /* Most systems will need to override OUTBSYNC, alas however
 146            this one is controller specific! */
 147         hwif->OUTBSYNC  = ide_mm_outbsync;
 148         hwif->OUTW      = ide_mm_outw;
 149         hwif->OUTSW     = ide_mm_outsw;
 150         hwif->OUTSL     = ide_mm_outsl;
 151         hwif->INB       = ide_mm_inb;
 152         hwif->INW       = ide_mm_inw;
 153         hwif->INSW      = ide_mm_insw;
 154         hwif->INSL      = ide_mm_insl;
 155 }
 156
 157 EXPORT_SYMBOL(default_hwif_mmiops);
 158
 159 void SELECT_DRIVE (ide_drive_t *drive)
 160 {
 161         if (HWIF(drive)->selectproc)
 162                 HWIF(drive)->selectproc(drive);
 163         HWIF(drive)->OUTB(drive->select.all, IDE_SELECT_REG);
 164 }
 165
 166 void SELECT_MASK (ide_drive_t *drive, int mask)
 167 {
 168         if (HWIF(drive)->maskproc)
 169                 HWIF(drive)->maskproc(drive, mask);
 170 }
 171
 172 /*
 173  * Some localbus EIDE interfaces require a special access sequence
 174  * when using 32-bit I/O instructions to transfer data.  We call this
 175  * the "vlb_sync" sequence, which consists of three successive reads
 176  * of the sector count register location, with interrupts disabled
 177  * to ensure that the reads all happen together.
 178  */
 179 static void ata_vlb_sync(ide_drive_t *drive, unsigned long port)
 180 {
 181         (void) HWIF(drive)->INB(port);
 182         (void) HWIF(drive)->INB(port);
 183         (void) HWIF(drive)->INB(port);
 184 }
 185
 186 /*
 187  * This is used for most PIO data transfers *from* the IDE interface
 188  */
 189 static void ata_input_data(ide_drive_t *drive, void *buffer, u32 wcount)
 190 {
 191         ide_hwif_t *hwif        = HWIF(drive);
 192         u8 io_32bit             = drive->io_32bit;
 193
 194         if (io_32bit) {
 195                 if (io_32bit & 2) {
 196                         unsigned long flags;
 197                         local_irq_save(flags);
 198                         ata_vlb_sync(drive, IDE_NSECTOR_REG);
 199                         hwif->INSL(IDE_DATA_REG, buffer, wcount);
 200                         local_irq_restore(flags);
 201                 } else
 202                         hwif->INSL(IDE_DATA_REG, buffer, wcount);
 203         } else {
 204                 hwif->INSW(IDE_DATA_REG, buffer, wcount<<1);
 205         }
 206 }
 207
 208 /*
 209  * This is used for most PIO data transfers *to* the IDE interface
 210  */
 211 static void ata_output_data(ide_drive_t *drive, void *buffer, u32 wcount)
 212 {
 213         ide_hwif_t *hwif        = HWIF(drive);
 214         u8 io_32bit             = drive->io_32bit;
 215
 216         if (io_32bit) {
 217                 if (io_32bit & 2) {
 218                         unsigned long flags;
 219                         local_irq_save(flags);
 220                         ata_vlb_sync(drive, IDE_NSECTOR_REG);
 221                         hwif->OUTSL(IDE_DATA_REG, buffer, wcount);
 222                         local_irq_restore(flags);
 223                 } else
 224                         hwif->OUTSL(IDE_DATA_REG, buffer, wcount);
 225         } else {
 226                 hwif->OUTSW(IDE_DATA_REG, buffer, wcount<<1);
 227         }
 228 }
 229
 230 /*
 231  * The following routines are mainly used by the ATAPI drivers.
 232  *
 233  * These routines will round up any request for an odd number of bytes,
 234  * so if an odd bytecount is specified, be sure that there's at least one
 235  * extra byte allocated for the buffer.
 236  */
 237
 238 static void atapi_input_bytes(ide_drive_t *drive, void *buffer, u32 bytecount)
 239 {
 240         ide_hwif_t *hwif = HWIF(drive);
 241
 242         ++bytecount;
 243 #if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
 244         if (MACH_IS_ATARI || MACH_IS_Q40) {
 245                 /* Atari has a byte-swapped IDE interface */
 246                 insw_swapw(IDE_DATA_REG, buffer, bytecount / 2);
 247                 return;
 248         }
 249 #endif /* CONFIG_ATARI || CONFIG_Q40 */
 250         hwif->ata_input_data(drive, buffer, bytecount / 4);
 251         if ((bytecount & 0x03) >= 2)
 252                 hwif->INSW(IDE_DATA_REG, ((u8 *)buffer)+(bytecount & ~0x03), 1);
 253 }
 254
 255 static void atapi_output_bytes(ide_drive_t *drive, void *buffer, u32 bytecount)
 256 {
 257         ide_hwif_t *hwif = HWIF(drive);
 258
 259         ++bytecount;
 260 #if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
 261         if (MACH_IS_ATARI || MACH_IS_Q40) {
 262                 /* Atari has a byte-swapped IDE interface */
 263                 outsw_swapw(IDE_DATA_REG, buffer, bytecount / 2);
 264                 return;
 265         }
 266 #endif /* CONFIG_ATARI || CONFIG_Q40 */
 267         hwif->ata_output_data(drive, buffer, bytecount / 4);
 268         if ((bytecount & 0x03) >= 2)
 269                 hwif->OUTSW(IDE_DATA_REG, ((u8*)buffer)+(bytecount & ~0x03), 1);
 270 }
 271
 272 void default_hwif_transport(ide_hwif_t *hwif)
 273 {
 274         hwif->ata_input_data            = ata_input_data;
 275         hwif->ata_output_data           = ata_output_data;
 276         hwif->atapi_input_bytes         = atapi_input_bytes;
 277         hwif->atapi_output_bytes        = atapi_output_bytes;
 278 }
 279
 280 void ide_fix_driveid (struct hd_driveid *id)
 281 {
 282 #ifndef __LITTLE_ENDIAN
 283 # ifdef __BIG_ENDIAN
 284         int i;
 285         u16 *stringcast;
 286
 287         id->config         = __le16_to_cpu(id->config);
 288         id->cyls           = __le16_to_cpu(id->cyls);
 289         id->reserved2      = __le16_to_cpu(id->reserved2);
 290         id->heads          = __le16_to_cpu(id->heads);
 291         id->track_bytes    = __le16_to_cpu(id->track_bytes);
 292         id->sector_bytes   = __le16_to_cpu(id->sector_bytes);
 293         id->sectors        = __le16_to_cpu(id->sectors);
 294         id->vendor0        = __le16_to_cpu(id->vendor0);
 295         id->vendor1        = __le16_to_cpu(id->vendor1);
 296         id->vendor2        = __le16_to_cpu(id->vendor2);
 297         stringcast = (u16 *)&id->serial_no[0];
 298         for (i = 0; i < (20/2); i++)
 299                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 300         id->buf_type       = __le16_to_cpu(id->buf_type);
 301         id->buf_size       = __le16_to_cpu(id->buf_size);
 302         id->ecc_bytes      = __le16_to_cpu(id->ecc_bytes);
 303         stringcast = (u16 *)&id->fw_rev[0];
 304         for (i = 0; i < (8/2); i++)
 305                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 306         stringcast = (u16 *)&id->model[0];
 307         for (i = 0; i < (40/2); i++)
 308                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 309         id->dword_io       = __le16_to_cpu(id->dword_io);
 310         id->reserved50     = __le16_to_cpu(id->reserved50);
 311         id->field_valid    = __le16_to_cpu(id->field_valid);
 312         id->cur_cyls       = __le16_to_cpu(id->cur_cyls);
 313         id->cur_heads      = __le16_to_cpu(id->cur_heads);
 314         id->cur_sectors    = __le16_to_cpu(id->cur_sectors);
 315         id->cur_capacity0  = __le16_to_cpu(id->cur_capacity0);
 316         id->cur_capacity1  = __le16_to_cpu(id->cur_capacity1);
 317         id->lba_capacity   = __le32_to_cpu(id->lba_capacity);
 318         id->dma_1word      = __le16_to_cpu(id->dma_1word);
 319         id->dma_mword      = __le16_to_cpu(id->dma_mword);
 320         id->eide_pio_modes = __le16_to_cpu(id->eide_pio_modes);
 321         id->eide_dma_min   = __le16_to_cpu(id->eide_dma_min);
 322         id->eide_dma_time  = __le16_to_cpu(id->eide_dma_time);
 323         id->eide_pio       = __le16_to_cpu(id->eide_pio);
 324         id->eide_pio_iordy = __le16_to_cpu(id->eide_pio_iordy);
 325         for (i = 0; i < 2; ++i)
 326                 id->words69_70[i] = __le16_to_cpu(id->words69_70[i]);
 327         for (i = 0; i < 4; ++i)
 328                 id->words71_74[i] = __le16_to_cpu(id->words71_74[i]);
 329         id->queue_depth    = __le16_to_cpu(id->queue_depth);
 330         for (i = 0; i < 4; ++i)
 331                 id->words76_79[i] = __le16_to_cpu(id->words76_79[i]);
 332         id->major_rev_num  = __le16_to_cpu(id->major_rev_num);
 333         id->minor_rev_num  = __le16_to_cpu(id->minor_rev_num);
 334         id->command_set_1  = __le16_to_cpu(id->command_set_1);
 335         id->command_set_2  = __le16_to_cpu(id->command_set_2);
 336         id->cfsse          = __le16_to_cpu(id->cfsse);
 337         id->cfs_enable_1   = __le16_to_cpu(id->cfs_enable_1);
 338         id->cfs_enable_2   = __le16_to_cpu(id->cfs_enable_2);
 339         id->csf_default    = __le16_to_cpu(id->csf_default);
 340         id->dma_ultra      = __le16_to_cpu(id->dma_ultra);
 341         id->trseuc         = __le16_to_cpu(id->trseuc);
 342         id->trsEuc         = __le16_to_cpu(id->trsEuc);
 343         id->CurAPMvalues   = __le16_to_cpu(id->CurAPMvalues);
 344         id->mprc           = __le16_to_cpu(id->mprc);
 345         id->hw_config      = __le16_to_cpu(id->hw_config);
 346         id->acoustic       = __le16_to_cpu(id->acoustic);
 347         id->msrqs          = __le16_to_cpu(id->msrqs);
 348         id->sxfert         = __le16_to_cpu(id->sxfert);
 349         id->sal            = __le16_to_cpu(id->sal);
 350         id->spg            = __le32_to_cpu(id->spg);
 351         id->lba_capacity_2 = __le64_to_cpu(id->lba_capacity_2);
 352         for (i = 0; i < 22; i++)
 353                 id->words104_125[i]   = __le16_to_cpu(id->words104_125[i]);
 354         id->last_lun       = __le16_to_cpu(id->last_lun);
 355         id->word127        = __le16_to_cpu(id->word127);
 356         id->dlf            = __le16_to_cpu(id->dlf);
 357         id->csfo           = __le16_to_cpu(id->csfo);
 358         for (i = 0; i < 26; i++)
 359                 id->words130_155[i] = __le16_to_cpu(id->words130_155[i]);
 360         id->word156        = __le16_to_cpu(id->word156);
 361         for (i = 0; i < 3; i++)
 362                 id->words157_159[i] = __le16_to_cpu(id->words157_159[i]);
 363         id->cfa_power      = __le16_to_cpu(id->cfa_power);
 364         for (i = 0; i < 14; i++)
 365                 id->words161_175[i] = __le16_to_cpu(id->words161_175[i]);
 366         for (i = 0; i < 31; i++)
 367                 id->words176_205[i] = __le16_to_cpu(id->words176_205[i]);
 368         for (i = 0; i < 48; i++)
 369                 id->words206_254[i] = __le16_to_cpu(id->words206_254[i]);
 370         id->integrity_word  = __le16_to_cpu(id->integrity_word);
 371 # else
 372 #  error "Please fix <asm/byteorder.h>"
 373 # endif
 374 #endif
 375 }
 376
 377 /*
 378  * ide_fixstring() cleans up and (optionally) byte-swaps a text string,
 379  * removing leading/trailing blanks and compressing internal blanks.
 380  * It is primarily used to tidy up the model name/number fields as
 381  * returned by the WIN_[P]IDENTIFY commands.
 382  */
 383
 384 void ide_fixstring (u8 *s, const int bytecount, const int byteswap)
 385 {
 386         u8 *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
 387
 388         if (byteswap) {
 389                 /* convert from big-endian to host byte order */
 390                 for (p = end ; p != s;) {
 391                         unsigned short *pp = (unsigned short *) (p -= 2);
 392                         *pp = ntohs(*pp);
 393                 }
 394         }
 395         /* strip leading blanks */
 396         while (s != end && *s == ' ')
 397                 ++s;
 398         /* compress internal blanks and strip trailing blanks */
 399         while (s != end && *s) {
 400                 if (*s++ != ' ' || (s != end && *s && *s != ' '))
 401                         *p++ = *(s-1);
 402         }
 403         /* wipe out trailing garbage */
 404         while (p != end)
 405                 *p++ = '\0';
 406 }
 407
 408 EXPORT_SYMBOL(ide_fixstring);
 409
 410 /*
 411  * Needed for PCI irq sharing
 412  */
 413 int drive_is_ready (ide_drive_t *drive)
 414 {
 415         ide_hwif_t *hwif        = HWIF(drive);
 416         u8 stat                 = 0;
 417
 418         if (drive->waiting_for_dma)
 419                 return hwif->ide_dma_test_irq(drive);
 420
 421 #if 0
 422         /* need to guarantee 400ns since last command was issued */
 423         udelay(1);
 424 #endif
 425
 426         /*
 427          * We do a passive status test under shared PCI interrupts on
 428          * cards that truly share the ATA side interrupt, but may also share
 429          * an interrupt with another pci card/device.  We make no assumptions
 430          * about possible isa-pnp and pci-pnp issues yet.
 431          */
 432         if (IDE_CONTROL_REG)
 433                 stat = ide_read_altstatus(drive);
 434         else
 435                 /* Note: this may clear a pending IRQ!! */
 436                 stat = ide_read_status(drive);
 437
 438         if (stat & BUSY_STAT)
 439                 /* drive busy:  definitely not interrupting */
 440                 return 0;
 441
 442         /* drive ready: *might* be interrupting */
 443         return 1;
 444 }
 445
 446 EXPORT_SYMBOL(drive_is_ready);
 447
 448 /*
 449  * This routine busy-waits for the drive status to be not "busy".
 450  * It then checks the status for all of the "good" bits and none
 451  * of the "bad" bits, and if all is okay it returns 0.  All other
 452  * cases return error -- caller may then invoke ide_error().
 453  *
 454  * This routine should get fixed to not hog the cpu during extra long waits..
 455  * That could be done by busy-waiting for the first jiffy or two, and then
 456  * setting a timer to wake up at half second intervals thereafter,
 457  * until timeout is achieved, before timing out.
 458  */
 459 static int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout, u8 *rstat)
 460 {
 461         unsigned long flags;
 462         int i;
 463         u8 stat;
 464
 465         udelay(1);      /* spec allows drive 400ns to assert "BUSY" */
 466         stat = ide_read_status(drive);
 467
 468         if (stat & BUSY_STAT) {
 469                 local_irq_set(flags);
 470                 timeout += jiffies;
 471                 while ((stat = ide_read_status(drive)) & BUSY_STAT) {
 472                         if (time_after(jiffies, timeout)) {
 473                                 /*
 474                                  * One last read after the timeout in case
 475                                  * heavy interrupt load made us not make any
 476                                  * progress during the timeout..
 477                                  */
 478                                 stat = ide_read_status(drive);
 479                                 if (!(stat & BUSY_STAT))
 480                                         break;
 481
 482                                 local_irq_restore(flags);
 483                                 *rstat = stat;
 484                                 return -EBUSY;
 485                         }
 486                 }
 487                 local_irq_restore(flags);
 488         }
 489         /*
 490          * Allow status to settle, then read it again.
 491          * A few rare drives vastly violate the 400ns spec here,
 492          * so we'll wait up to 10usec for a "good" status
 493          * rather than expensively fail things immediately.
 494          * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 495          */
 496         for (i = 0; i < 10; i++) {
 497                 udelay(1);
 498                 stat = ide_read_status(drive);
 499
 500                 if (OK_STAT(stat, good, bad)) {
 501                         *rstat = stat;
 502                         return 0;
 503                 }
 504         }
 505         *rstat = stat;
 506         return -EFAULT;
 507 }
 508
 509 /*
 510  * In case of error returns error value after doing "*startstop = ide_error()".
 511  * The caller should return the updated value of "startstop" in this case,
 512  * "startstop" is unchanged when the function returns 0.
 513  */
 514 int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout)
 515 {
 516         int err;
 517         u8 stat;
 518
 519         /* bail early if we've exceeded max_failures */
 520         if (drive->max_failures && (drive->failures > drive->max_failures)) {
 521                 *startstop = ide_stopped;
 522                 return 1;
 523         }
 524
 525         err = __ide_wait_stat(drive, good, bad, timeout, &stat);
 526
 527         if (err) {
 528                 char *s = (err == -EBUSY) ? "status timeout" : "status error";
 529                 *startstop = ide_error(drive, s, stat);
 530         }
 531
 532         return err;
 533 }
 534
 535 EXPORT_SYMBOL(ide_wait_stat);
 536
 537 /**
 538  *      ide_in_drive_list       -       look for drive in black/white list
 539  *      @id: drive identifier
 540  *      @drive_table: list to inspect
 541  *
 542  *      Look for a drive in the blacklist and the whitelist tables
 543  *      Returns 1 if the drive is found in the table.
 544  */
 545
 546 int ide_in_drive_list(struct hd_driveid *id, const struct drive_list_entry *drive_table)
 547 {
 548         for ( ; drive_table->id_model; drive_table++)
 549                 if ((!strcmp(drive_table->id_model, id->model)) &&
 550                     (!drive_table->id_firmware ||
 551                      strstr(id->fw_rev, drive_table->id_firmware)))
 552                         return 1;
 553         return 0;
 554 }
 555
 556 EXPORT_SYMBOL_GPL(ide_in_drive_list);
 557
 558 /*
 559  * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid.
 560  * We list them here and depend on the device side cable detection for them.
 561  *
 562  * Some optical devices with the buggy firmwares have the same problem.
 563  */
 564 static const struct drive_list_entry ivb_list[] = {
 565         { "QUANTUM FIREBALLlct10 05"    , "A03.0900"    },
 566         { "TSSTcorp CDDVDW SH-S202J"    , "SB00"        },
 567         { "TSSTcorp CDDVDW SH-S202J"    , "SB01"        },
 568         { "TSSTcorp CDDVDW SH-S202N"    , "SB00"        },
 569         { "TSSTcorp CDDVDW SH-S202N"    , "SB01"        },
 570         { NULL                          , NULL          }
 571 };
 572
 573 /*
 574  *  All hosts that use the 80c ribbon must use!
 575  *  The name is derived from upper byte of word 93 and the 80c ribbon.
 576  */
 577 u8 eighty_ninty_three (ide_drive_t *drive)
 578 {
 579         ide_hwif_t *hwif = drive->hwif;
 580         struct hd_driveid *id = drive->id;
 581         int ivb = ide_in_drive_list(id, ivb_list);
 582
 583         if (hwif->cbl == ATA_CBL_PATA40_SHORT)
 584                 return 1;
 585
 586         if (ivb)
 587                 printk(KERN_DEBUG "%s: skipping word 93 validity check\n",
 588                                   drive->name);
 589
 590         if (ide_dev_is_sata(id) && !ivb)
 591                 return 1;
 592
 593         if (hwif->cbl != ATA_CBL_PATA80 && !ivb)
 594                 goto no_80w;
 595
 596         /*
 597          * FIXME:
 598          * - force bit13 (80c cable present) check also for !ivb devices
 599          *   (unless the slave device is pre-ATA3)
 600          */
 601         if ((id->hw_config & 0x4000) || (ivb && (id->hw_config & 0x2000)))
 602                 return 1;
 603
 604 no_80w:
 605         if (drive->udma33_warned == 1)
 606                 return 0;
 607
 608         printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, "
 609                             "limiting max speed to UDMA33\n",
 610                             drive->name,
 611                             hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host");
 612
 613         drive->udma33_warned = 1;
 614
 615         return 0;
 616 }
 617
 618 int ide_driveid_update(ide_drive_t *drive)
 619 {
 620         ide_hwif_t *hwif = drive->hwif;
 621         struct hd_driveid *id;
 622         unsigned long timeout, flags;
 623         u8 stat;
 624
 625         /*
 626          * Re-read drive->id for possible DMA mode
 627          * change (copied from ide-probe.c)
 628          */
 629
 630         SELECT_MASK(drive, 1);
 631         ide_set_irq(drive, 1);
 632         msleep(50);
 633         hwif->OUTB(WIN_IDENTIFY, IDE_COMMAND_REG);
 634         timeout = jiffies + WAIT_WORSTCASE;
 635         do {
 636                 if (time_after(jiffies, timeout)) {
 637                         SELECT_MASK(drive, 0);
 638                         return 0;       /* drive timed-out */
 639                 }
 640
 641                 msleep(50);     /* give drive a breather */
 642                 stat = ide_read_altstatus(drive);
 643         } while (stat & BUSY_STAT);
 644
 645         msleep(50);     /* wait for IRQ and DRQ_STAT */
 646         stat = ide_read_status(drive);
 647
 648         if (!OK_STAT(stat, DRQ_STAT, BAD_R_STAT)) {
 649                 SELECT_MASK(drive, 0);
 650                 printk("%s: CHECK for good STATUS\n", drive->name);
 651                 return 0;
 652         }
 653         local_irq_save(flags);
 654         SELECT_MASK(drive, 0);
 655         id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
 656         if (!id) {
 657                 local_irq_restore(flags);
 658                 return 0;
 659         }
 660         ata_input_data(drive, id, SECTOR_WORDS);
 661         (void)ide_read_status(drive);   /* clear drive IRQ */
 662         local_irq_enable();
 663         local_irq_restore(flags);
 664         ide_fix_driveid(id);
 665         if (id) {
 666                 drive->id->dma_ultra = id->dma_ultra;
 667                 drive->id->dma_mword = id->dma_mword;
 668                 drive->id->dma_1word = id->dma_1word;
 669                 /* anything more ? */
 670                 kfree(id);
 671
 672                 if (drive->using_dma && ide_id_dma_bug(drive))
 673                         ide_dma_off(drive);
 674         }
 675
 676         return 1;
 677 }
 678
 679 int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
 680 {
 681         ide_hwif_t *hwif = drive->hwif;
 682         int error = 0;
 683         u8 stat;
 684
 685 //      while (HWGROUP(drive)->busy)
 686 //              msleep(50);
 687
 688 #ifdef CONFIG_BLK_DEV_IDEDMA
 689         if (hwif->dma_host_set) /* check if host supports DMA */
 690                 hwif->dma_host_set(drive, 0);
 691 #endif
 692
 693         /* Skip setting PIO flow-control modes on pre-EIDE drives */
 694         if ((speed & 0xf8) == XFER_PIO_0 && !(drive->id->capability & 0x08))
 695                 goto skip;
 696
 697         /*
 698          * Don't use ide_wait_cmd here - it will
 699          * attempt to set_geometry and recalibrate,
 700          * but for some reason these don't work at
 701          * this point (lost interrupt).
 702          */
 703         /*
 704          * Select the drive, and issue the SETFEATURES command
 705          */
 706         disable_irq_nosync(hwif->irq);
 707
 708         /*
 709          *      FIXME: we race against the running IRQ here if
 710          *      this is called from non IRQ context. If we use
 711          *      disable_irq() we hang on the error path. Work
 712          *      is needed.
 713          */
 714
 715         udelay(1);
 716         SELECT_DRIVE(drive);
 717         SELECT_MASK(drive, 0);
 718         udelay(1);
 719         ide_set_irq(drive, 0);
 720         hwif->OUTB(speed, IDE_NSECTOR_REG);
 721         hwif->OUTB(SETFEATURES_XFER, IDE_FEATURE_REG);
 722         hwif->OUTBSYNC(drive, WIN_SETFEATURES, IDE_COMMAND_REG);
 723         if (drive->quirk_list == 2)
 724                 ide_set_irq(drive, 1);
 725
 726         error = __ide_wait_stat(drive, drive->ready_stat,
 727                                 BUSY_STAT|DRQ_STAT|ERR_STAT,
 728                                 WAIT_CMD, &stat);
 729
 730         SELECT_MASK(drive, 0);
 731
 732         enable_irq(hwif->irq);
 733
 734         if (error) {
 735                 (void) ide_dump_status(drive, "set_drive_speed_status", stat);
 736                 return error;
 737         }
 738
 739         drive->id->dma_ultra &= ~0xFF00;
 740         drive->id->dma_mword &= ~0x0F00;
 741         drive->id->dma_1word &= ~0x0F00;
 742
 743  skip:
 744 #ifdef CONFIG_BLK_DEV_IDEDMA
 745         if ((speed >= XFER_SW_DMA_0 || (hwif->host_flags & IDE_HFLAG_VDMA)) &&
 746             drive->using_dma)
 747                 hwif->dma_host_set(drive, 1);
 748         else if (hwif->dma_host_set)    /* check if host supports DMA */
 749                 ide_dma_off_quietly(drive);
 750 #endif
 751
 752         switch(speed) {
 753                 case XFER_UDMA_7:   drive->id->dma_ultra |= 0x8080; break;
 754                 case XFER_UDMA_6:   drive->id->dma_ultra |= 0x4040; break;
 755                 case XFER_UDMA_5:   drive->id->dma_ultra |= 0x2020; break;
 756                 case XFER_UDMA_4:   drive->id->dma_ultra |= 0x1010; break;
 757                 case XFER_UDMA_3:   drive->id->dma_ultra |= 0x0808; break;
 758                 case XFER_UDMA_2:   drive->id->dma_ultra |= 0x0404; break;
 759                 case XFER_UDMA_1:   drive->id->dma_ultra |= 0x0202; break;
 760                 case XFER_UDMA_0:   drive->id->dma_ultra |= 0x0101; break;
 761                 case XFER_MW_DMA_2: drive->id->dma_mword |= 0x0404; break;
 762                 case XFER_MW_DMA_1: drive->id->dma_mword |= 0x0202; break;
 763                 case XFER_MW_DMA_0: drive->id->dma_mword |= 0x0101; break;
 764                 case XFER_SW_DMA_2: drive->id->dma_1word |= 0x0404; break;
 765                 case XFER_SW_DMA_1: drive->id->dma_1word |= 0x0202; break;
 766                 case XFER_SW_DMA_0: drive->id->dma_1word |= 0x0101; break;
 767                 default: break;
 768         }
 769         if (!drive->init_speed)
 770                 drive->init_speed = speed;
 771         drive->current_speed = speed;
 772         return error;
 773 }
 774
 775 /*
 776  * This should get invoked any time we exit the driver to
 777  * wait for an interrupt response from a drive.  handler() points
 778  * at the appropriate code to handle the next interrupt, and a
 779  * timer is started to prevent us from waiting forever in case
 780  * something goes wrong (see the ide_timer_expiry() handler later on).
 781  *
 782  * See also ide_execute_command
 783  */
 784 static void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 785                       unsigned int timeout, ide_expiry_t *expiry)
 786 {
 787         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 788
 789         if (hwgroup->handler != NULL) {
 790                 printk(KERN_CRIT "%s: ide_set_handler: handler not null; "
 791                         "old=%p, new=%p\n",
 792                         drive->name, hwgroup->handler, handler);
 793         }
 794         hwgroup->handler        = handler;
 795         hwgroup->expiry         = expiry;
 796         hwgroup->timer.expires  = jiffies + timeout;
 797         hwgroup->req_gen_timer = hwgroup->req_gen;
 798         add_timer(&hwgroup->timer);
 799 }
 800
 801 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 802                       unsigned int timeout, ide_expiry_t *expiry)
 803 {
 804         unsigned long flags;
 805         spin_lock_irqsave(&ide_lock, flags);
 806         __ide_set_handler(drive, handler, timeout, expiry);
 807         spin_unlock_irqrestore(&ide_lock, flags);
 808 }
 809
 810 EXPORT_SYMBOL(ide_set_handler);
 811
 812 /**
 813  *      ide_execute_command     -       execute an IDE command
 814  *      @drive: IDE drive to issue the command against
 815  *      @command: command byte to write
 816  *      @handler: handler for next phase
 817  *      @timeout: timeout for command
 818  *      @expiry:  handler to run on timeout
 819  *
 820  *      Helper function to issue an IDE command. This handles the
 821  *      atomicity requirements, command timing and ensures that the
 822  *      handler and IRQ setup do not race. All IDE command kick off
 823  *      should go via this function or do equivalent locking.
 824  */
 825
 826 void ide_execute_command(ide_drive_t *drive, u8 cmd, ide_handler_t *handler,
 827                          unsigned timeout, ide_expiry_t *expiry)
 828 {
 829         unsigned long flags;
 830         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 831         ide_hwif_t *hwif = HWIF(drive);
 832
 833         spin_lock_irqsave(&ide_lock, flags);
 834         BUG_ON(hwgroup->handler);
 835         __ide_set_handler(drive, handler, timeout, expiry);
 836         hwif->OUTBSYNC(drive, cmd, IDE_COMMAND_REG);
 837         /*
 838          * Drive takes 400nS to respond, we must avoid the IRQ being
 839          * serviced before that.
 840          *
 841          * FIXME: we could skip this delay with care on non shared devices
 842          */
 843         ndelay(400);
 844         spin_unlock_irqrestore(&ide_lock, flags);
 845 }
 846
 847 EXPORT_SYMBOL(ide_execute_command);
 848
 849
 850 /* needed below */
 851 static ide_startstop_t do_reset1 (ide_drive_t *, int);
 852
 853 /*
 854  * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 855  * during an atapi drive reset operation. If the drive has not yet responded,
 856  * and we have not yet hit our maximum waiting time, then the timer is restarted
 857  * for another 50ms.
 858  */
 859 static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
 860 {
 861         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
 862         u8 stat;
 863
 864         SELECT_DRIVE(drive);
 865         udelay (10);
 866         stat = ide_read_status(drive);
 867
 868         if (OK_STAT(stat, 0, BUSY_STAT))
 869                 printk("%s: ATAPI reset complete\n", drive->name);
 870         else {
 871                 if (time_before(jiffies, hwgroup->poll_timeout)) {
 872                         ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
 873                         /* continue polling */
 874                         return ide_started;
 875                 }
 876                 /* end of polling */
 877                 hwgroup->polling = 0;
 878                 printk("%s: ATAPI reset timed-out, status=0x%02x\n",
 879                                 drive->name, stat);
 880                 /* do it the old fashioned way */
 881                 return do_reset1(drive, 1);
 882         }
 883         /* done polling */
 884         hwgroup->polling = 0;
 885         hwgroup->resetting = 0;
 886         return ide_stopped;
 887 }
 888
 889 /*
 890  * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 891  * during an ide reset operation. If the drives have not yet responded,
 892  * and we have not yet hit our maximum waiting time, then the timer is restarted
 893  * for another 50ms.
 894  */
 895 static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
 896 {
 897         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
 898         ide_hwif_t *hwif        = HWIF(drive);
 899         u8 tmp;
 900
 901         if (hwif->reset_poll != NULL) {
 902                 if (hwif->reset_poll(drive)) {
 903                         printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
 904                                 hwif->name, drive->name);
 905                         return ide_stopped;
 906                 }
 907         }
 908
 909         tmp = ide_read_status(drive);
 910
 911         if (!OK_STAT(tmp, 0, BUSY_STAT)) {
 912                 if (time_before(jiffies, hwgroup->poll_timeout)) {
 913                         ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
 914                         /* continue polling */
 915                         return ide_started;
 916                 }
 917                 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
 918                 drive->failures++;
 919         } else  {
 920                 printk("%s: reset: ", hwif->name);
 921                 if ((tmp = hwif->INB(IDE_ERROR_REG)) == 1) {
 922                         printk("success\n");
 923                         drive->failures = 0;
 924                 } else {
 925                         drive->failures++;
 926                         printk("master: ");
 927                         switch (tmp & 0x7f) {
 928                                 case 1: printk("passed");
 929                                         break;
 930                                 case 2: printk("formatter device error");
 931                                         break;
 932                                 case 3: printk("sector buffer error");
 933                                         break;
 934                                 case 4: printk("ECC circuitry error");
 935                                         break;
 936                                 case 5: printk("controlling MPU error");
 937                                         break;
 938                                 default:printk("error (0x%02x?)", tmp);
 939                         }
 940                         if (tmp & 0x80)
 941                                 printk("; slave: failed");
 942                         printk("\n");
 943                 }
 944         }
 945         hwgroup->polling = 0;   /* done polling */
 946         hwgroup->resetting = 0; /* done reset attempt */
 947         return ide_stopped;
 948 }
 949
 950 static void ide_disk_pre_reset(ide_drive_t *drive)
 951 {
 952         int legacy = (drive->id->cfs_enable_2 & 0x0400) ? 0 : 1;
 953
 954         drive->special.all = 0;
 955         drive->special.b.set_geometry = legacy;
 956         drive->special.b.recalibrate  = legacy;
 957         drive->mult_count = 0;
 958         if (!drive->keep_settings && !drive->using_dma)
 959                 drive->mult_req = 0;
 960         if (drive->mult_req != drive->mult_count)
 961                 drive->special.b.set_multmode = 1;
 962 }
 963
 964 static void pre_reset(ide_drive_t *drive)
 965 {
 966         if (drive->media == ide_disk)
 967                 ide_disk_pre_reset(drive);
 968         else
 969                 drive->post_reset = 1;
 970
 971         if (drive->using_dma) {
 972                 if (drive->crc_count)
 973                         ide_check_dma_crc(drive);
 974                 else
 975                         ide_dma_off(drive);
 976         }
 977
 978         if (!drive->keep_settings) {
 979                 if (!drive->using_dma) {
 980                         drive->unmask = 0;
 981                         drive->io_32bit = 0;
 982                 }
 983                 return;
 984         }
 985
 986         if (HWIF(drive)->pre_reset != NULL)
 987                 HWIF(drive)->pre_reset(drive);
 988
 989         if (drive->current_speed != 0xff)
 990                 drive->desired_speed = drive->current_speed;
 991         drive->current_speed = 0xff;
 992 }
 993
 994 /*
 995  * do_reset1() attempts to recover a confused drive by resetting it.
 996  * Unfortunately, resetting a disk drive actually resets all devices on
 997  * the same interface, so it can really be thought of as resetting the
 998  * interface rather than resetting the drive.
 999  *
1000  * ATAPI devices have their own reset mechanism which allows them to be
1001  * individually reset without clobbering other devices on the same interface.
1002  *
1003  * Unfortunately, the IDE interface does not generate an interrupt to let
1004  * us know when the reset operation has finished, so we must poll for this.
1005  * Equally poor, though, is the fact that this may a very long time to complete,
1006  * (up to 30 seconds worstcase).  So, instead of busy-waiting here for it,
1007  * we set a timer to poll at 50ms intervals.
1008  */
1009 static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
1010 {
1011         unsigned int unit;
1012         unsigned long flags;
1013         ide_hwif_t *hwif;
1014         ide_hwgroup_t *hwgroup;
1015
1016         spin_lock_irqsave(&ide_lock, flags);
1017         hwif = HWIF(drive);
1018         hwgroup = HWGROUP(drive);
1019
1020         /* We must not reset with running handlers */
1021         BUG_ON(hwgroup->handler != NULL);
1022
1023         /* For an ATAPI device, first try an ATAPI SRST. */
1024         if (drive->media != ide_disk && !do_not_try_atapi) {
1025                 hwgroup->resetting = 1;
1026                 pre_reset(drive);
1027                 SELECT_DRIVE(drive);
1028                 udelay (20);
1029                 hwif->OUTBSYNC(drive, WIN_SRST, IDE_COMMAND_REG);
1030                 ndelay(400);
1031                 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1032                 hwgroup->polling = 1;
1033                 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1034                 spin_unlock_irqrestore(&ide_lock, flags);
1035                 return ide_started;
1036         }
1037
1038         /*
1039          * First, reset any device state data we were maintaining
1040          * for any of the drives on this interface.
1041          */
1042         for (unit = 0; unit < MAX_DRIVES; ++unit)
1043                 pre_reset(&hwif->drives[unit]);
1044
1045         if (!IDE_CONTROL_REG) {
1046                 spin_unlock_irqrestore(&ide_lock, flags);
1047                 return ide_stopped;
1048         }
1049
1050         hwgroup->resetting = 1;
1051         /*
1052          * Note that we also set nIEN while resetting the device,
1053          * to mask unwanted interrupts from the interface during the reset.
1054          * However, due to the design of PC hardware, this will cause an
1055          * immediate interrupt due to the edge transition it produces.
1056          * This single interrupt gives us a "fast poll" for drives that
1057          * recover from reset very quickly, saving us the first 50ms wait time.
1058          */
1059         /* set SRST and nIEN */
1060         hwif->OUTBSYNC(drive, drive->ctl|6,IDE_CONTROL_REG);
1061         /* more than enough time */
1062         udelay(10);
1063         if (drive->quirk_list == 2) {
1064                 /* clear SRST and nIEN */
1065                 hwif->OUTBSYNC(drive, drive->ctl, IDE_CONTROL_REG);
1066         } else {
1067                 /* clear SRST, leave nIEN */
1068                 hwif->OUTBSYNC(drive, drive->ctl|2, IDE_CONTROL_REG);
1069         }
1070         /* more than enough time */
1071         udelay(10);
1072         hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1073         hwgroup->polling = 1;
1074         __ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1075
1076         /*
1077          * Some weird controller like resetting themselves to a strange
1078          * state when the disks are reset this way. At least, the Winbond
1079          * 553 documentation says that
1080          */
1081         if (hwif->resetproc)
1082                 hwif->resetproc(drive);
1083
1084         spin_unlock_irqrestore(&ide_lock, flags);
1085         return ide_started;
1086 }
1087
1088 /*
1089  * ide_do_reset() is the entry point to the drive/interface reset code.
1090  */
1091
1092 ide_startstop_t ide_do_reset (ide_drive_t *drive)
1093 {
1094         return do_reset1(drive, 0);
1095 }
1096
1097 EXPORT_SYMBOL(ide_do_reset);
1098
1099 /*
1100  * ide_wait_not_busy() waits for the currently selected device on the hwif
1101  * to report a non-busy status, see comments in ide_probe_port().
1102  */
1103 int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
1104 {
1105         u8 stat = 0;
1106
1107         while(timeout--) {
1108                 /*
1109                  * Turn this into a schedule() sleep once I'm sure
1110                  * about locking issues (2.5 work ?).
1111                  */
1112                 mdelay(1);
1113                 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
1114                 if ((stat & BUSY_STAT) == 0)
1115                         return 0;
1116                 /*
1117                  * Assume a value of 0xff means nothing is connected to
1118                  * the interface and it doesn't implement the pull-down
1119                  * resistor on D7.
1120                  */
1121                 if (stat == 0xff)
1122                         return -ENODEV;
1123                 touch_softlockup_watchdog();
1124                 touch_nmi_watchdog();
1125         }
1126         return -EBUSY;
1127 }
1128
1129 EXPORT_SYMBOL_GPL(ide_wait_not_busy);
1130