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 = hwif->INB(IDE_ALTSTATUS_REG);
 434         else
 435                 /* Note: this may clear a pending IRQ!! */
 436                 stat = hwif->INB(IDE_STATUS_REG);
 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         ide_hwif_t *hwif = drive->hwif;
 462         unsigned long flags;
 463         int i;
 464         u8 stat;
 465
 466         udelay(1);      /* spec allows drive 400ns to assert "BUSY" */
 467         if ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 468                 local_irq_set(flags);
 469                 timeout += jiffies;
 470                 while ((stat = hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) {
 471                         if (time_after(jiffies, timeout)) {
 472                                 /*
 473                                  * One last read after the timeout in case
 474                                  * heavy interrupt load made us not make any
 475                                  * progress during the timeout..
 476                                  */
 477                                 stat = hwif->INB(IDE_STATUS_REG);
 478                                 if (!(stat & BUSY_STAT))
 479                                         break;
 480
 481                                 local_irq_restore(flags);
 482                                 *rstat = stat;
 483                                 return -EBUSY;
 484                         }
 485                 }
 486                 local_irq_restore(flags);
 487         }
 488         /*
 489          * Allow status to settle, then read it again.
 490          * A few rare drives vastly violate the 400ns spec here,
 491          * so we'll wait up to 10usec for a "good" status
 492          * rather than expensively fail things immediately.
 493          * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 494          */
 495         for (i = 0; i < 10; i++) {
 496                 udelay(1);
 497                 if (OK_STAT((stat = hwif->INB(IDE_STATUS_REG)), good, bad)) {
 498                         *rstat = stat;
 499                         return 0;
 500                 }
 501         }
 502         *rstat = stat;
 503         return -EFAULT;
 504 }
 505
 506 /*
 507  * In case of error returns error value after doing "*startstop = ide_error()".
 508  * The caller should return the updated value of "startstop" in this case,
 509  * "startstop" is unchanged when the function returns 0.
 510  */
 511 int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout)
 512 {
 513         int err;
 514         u8 stat;
 515
 516         /* bail early if we've exceeded max_failures */
 517         if (drive->max_failures && (drive->failures > drive->max_failures)) {
 518                 *startstop = ide_stopped;
 519                 return 1;
 520         }
 521
 522         err = __ide_wait_stat(drive, good, bad, timeout, &stat);
 523
 524         if (err) {
 525                 char *s = (err == -EBUSY) ? "status timeout" : "status error";
 526                 *startstop = ide_error(drive, s, stat);
 527         }
 528
 529         return err;
 530 }
 531
 532 EXPORT_SYMBOL(ide_wait_stat);
 533
 534 /**
 535  *      ide_in_drive_list       -       look for drive in black/white list
 536  *      @id: drive identifier
 537  *      @drive_table: list to inspect
 538  *
 539  *      Look for a drive in the blacklist and the whitelist tables
 540  *      Returns 1 if the drive is found in the table.
 541  */
 542
 543 int ide_in_drive_list(struct hd_driveid *id, const struct drive_list_entry *drive_table)
 544 {
 545         for ( ; drive_table->id_model; drive_table++)
 546                 if ((!strcmp(drive_table->id_model, id->model)) &&
 547                     (!drive_table->id_firmware ||
 548                      strstr(id->fw_rev, drive_table->id_firmware)))
 549                         return 1;
 550         return 0;
 551 }
 552
 553 EXPORT_SYMBOL_GPL(ide_in_drive_list);
 554
 555 /*
 556  * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid.
 557  * We list them here and depend on the device side cable detection for them.
 558  *
 559  * Some optical devices with the buggy firmwares have the same problem.
 560  */
 561 static const struct drive_list_entry ivb_list[] = {
 562         { "QUANTUM FIREBALLlct10 05"    , "A03.0900"    },
 563         { "TSSTcorp CDDVDW SH-S202J"    , "SB00"        },
 564         { "TSSTcorp CDDVDW SH-S202J"    , "SB01"        },
 565         { "TSSTcorp CDDVDW SH-S202N"    , "SB00"        },
 566         { "TSSTcorp CDDVDW SH-S202N"    , "SB01"        },
 567         { NULL                          , NULL          }
 568 };
 569
 570 /*
 571  *  All hosts that use the 80c ribbon must use!
 572  *  The name is derived from upper byte of word 93 and the 80c ribbon.
 573  */
 574 u8 eighty_ninty_three (ide_drive_t *drive)
 575 {
 576         ide_hwif_t *hwif = drive->hwif;
 577         struct hd_driveid *id = drive->id;
 578         int ivb = ide_in_drive_list(id, ivb_list);
 579
 580         if (hwif->cbl == ATA_CBL_PATA40_SHORT)
 581                 return 1;
 582
 583         if (ivb)
 584                 printk(KERN_DEBUG "%s: skipping word 93 validity check\n",
 585                                   drive->name);
 586
 587         if (ide_dev_is_sata(id) && !ivb)
 588                 return 1;
 589
 590         if (hwif->cbl != ATA_CBL_PATA80 && !ivb)
 591                 goto no_80w;
 592
 593         /*
 594          * FIXME:
 595          * - force bit13 (80c cable present) check also for !ivb devices
 596          *   (unless the slave device is pre-ATA3)
 597          */
 598         if ((id->hw_config & 0x4000) || (ivb && (id->hw_config & 0x2000)))
 599                 return 1;
 600
 601 no_80w:
 602         if (drive->udma33_warned == 1)
 603                 return 0;
 604
 605         printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, "
 606                             "limiting max speed to UDMA33\n",
 607                             drive->name,
 608                             hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host");
 609
 610         drive->udma33_warned = 1;
 611
 612         return 0;
 613 }
 614
 615 #ifdef CONFIG_BLK_DEV_IDEDMA
 616 static u8 ide_auto_reduce_xfer (ide_drive_t *drive)
 617 {
 618         if (!drive->crc_count)
 619                 return drive->current_speed;
 620         drive->crc_count = 0;
 621
 622         switch(drive->current_speed) {
 623                 case XFER_UDMA_7:       return XFER_UDMA_6;
 624                 case XFER_UDMA_6:       return XFER_UDMA_5;
 625                 case XFER_UDMA_5:       return XFER_UDMA_4;
 626                 case XFER_UDMA_4:       return XFER_UDMA_3;
 627                 case XFER_UDMA_3:       return XFER_UDMA_2;
 628                 case XFER_UDMA_2:       return XFER_UDMA_1;
 629                 case XFER_UDMA_1:       return XFER_UDMA_0;
 630                         /*
 631                          * OOPS we do not goto non Ultra DMA modes
 632                          * without iCRC's available we force
 633                          * the system to PIO and make the user
 634                          * invoke the ATA-1 ATA-2 DMA modes.
 635                          */
 636                 case XFER_UDMA_0:
 637                 default:                return XFER_PIO_4;
 638         }
 639 }
 640 #endif /* CONFIG_BLK_DEV_IDEDMA */
 641
 642 int ide_driveid_update(ide_drive_t *drive)
 643 {
 644         ide_hwif_t *hwif = drive->hwif;
 645         struct hd_driveid *id;
 646         unsigned long timeout, flags;
 647
 648         /*
 649          * Re-read drive->id for possible DMA mode
 650          * change (copied from ide-probe.c)
 651          */
 652
 653         SELECT_MASK(drive, 1);
 654         ide_set_irq(drive, 1);
 655         msleep(50);
 656         hwif->OUTB(WIN_IDENTIFY, IDE_COMMAND_REG);
 657         timeout = jiffies + WAIT_WORSTCASE;
 658         do {
 659                 if (time_after(jiffies, timeout)) {
 660                         SELECT_MASK(drive, 0);
 661                         return 0;       /* drive timed-out */
 662                 }
 663                 msleep(50);     /* give drive a breather */
 664         } while (hwif->INB(IDE_ALTSTATUS_REG) & BUSY_STAT);
 665         msleep(50);     /* wait for IRQ and DRQ_STAT */
 666         if (!OK_STAT(hwif->INB(IDE_STATUS_REG),DRQ_STAT,BAD_R_STAT)) {
 667                 SELECT_MASK(drive, 0);
 668                 printk("%s: CHECK for good STATUS\n", drive->name);
 669                 return 0;
 670         }
 671         local_irq_save(flags);
 672         SELECT_MASK(drive, 0);
 673         id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
 674         if (!id) {
 675                 local_irq_restore(flags);
 676                 return 0;
 677         }
 678         ata_input_data(drive, id, SECTOR_WORDS);
 679         (void) hwif->INB(IDE_STATUS_REG);       /* clear drive IRQ */
 680         local_irq_enable();
 681         local_irq_restore(flags);
 682         ide_fix_driveid(id);
 683         if (id) {
 684                 drive->id->dma_ultra = id->dma_ultra;
 685                 drive->id->dma_mword = id->dma_mword;
 686                 drive->id->dma_1word = id->dma_1word;
 687                 /* anything more ? */
 688                 kfree(id);
 689
 690                 if (drive->using_dma && ide_id_dma_bug(drive))
 691                         ide_dma_off(drive);
 692         }
 693
 694         return 1;
 695 }
 696
 697 int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
 698 {
 699         ide_hwif_t *hwif = drive->hwif;
 700         int error = 0;
 701         u8 stat;
 702
 703 //      while (HWGROUP(drive)->busy)
 704 //              msleep(50);
 705
 706 #ifdef CONFIG_BLK_DEV_IDEDMA
 707         if (hwif->dma_host_set) /* check if host supports DMA */
 708                 hwif->dma_host_set(drive, 0);
 709 #endif
 710
 711         /* Skip setting PIO flow-control modes on pre-EIDE drives */
 712         if ((speed & 0xf8) == XFER_PIO_0 && !(drive->id->capability & 0x08))
 713                 goto skip;
 714
 715         /*
 716          * Don't use ide_wait_cmd here - it will
 717          * attempt to set_geometry and recalibrate,
 718          * but for some reason these don't work at
 719          * this point (lost interrupt).
 720          */
 721         /*
 722          * Select the drive, and issue the SETFEATURES command
 723          */
 724         disable_irq_nosync(hwif->irq);
 725
 726         /*
 727          *      FIXME: we race against the running IRQ here if
 728          *      this is called from non IRQ context. If we use
 729          *      disable_irq() we hang on the error path. Work
 730          *      is needed.
 731          */
 732
 733         udelay(1);
 734         SELECT_DRIVE(drive);
 735         SELECT_MASK(drive, 0);
 736         udelay(1);
 737         ide_set_irq(drive, 0);
 738         hwif->OUTB(speed, IDE_NSECTOR_REG);
 739         hwif->OUTB(SETFEATURES_XFER, IDE_FEATURE_REG);
 740         hwif->OUTBSYNC(drive, WIN_SETFEATURES, IDE_COMMAND_REG);
 741         if (drive->quirk_list == 2)
 742                 ide_set_irq(drive, 1);
 743
 744         error = __ide_wait_stat(drive, drive->ready_stat,
 745                                 BUSY_STAT|DRQ_STAT|ERR_STAT,
 746                                 WAIT_CMD, &stat);
 747
 748         SELECT_MASK(drive, 0);
 749
 750         enable_irq(hwif->irq);
 751
 752         if (error) {
 753                 (void) ide_dump_status(drive, "set_drive_speed_status", stat);
 754                 return error;
 755         }
 756
 757         drive->id->dma_ultra &= ~0xFF00;
 758         drive->id->dma_mword &= ~0x0F00;
 759         drive->id->dma_1word &= ~0x0F00;
 760
 761  skip:
 762 #ifdef CONFIG_BLK_DEV_IDEDMA
 763         if ((speed >= XFER_SW_DMA_0 || (hwif->host_flags & IDE_HFLAG_VDMA)) &&
 764             drive->using_dma)
 765                 hwif->dma_host_set(drive, 1);
 766         else if (hwif->dma_host_set)    /* check if host supports DMA */
 767                 ide_dma_off_quietly(drive);
 768 #endif
 769
 770         switch(speed) {
 771                 case XFER_UDMA_7:   drive->id->dma_ultra |= 0x8080; break;
 772                 case XFER_UDMA_6:   drive->id->dma_ultra |= 0x4040; break;
 773                 case XFER_UDMA_5:   drive->id->dma_ultra |= 0x2020; break;
 774                 case XFER_UDMA_4:   drive->id->dma_ultra |= 0x1010; break;
 775                 case XFER_UDMA_3:   drive->id->dma_ultra |= 0x0808; break;
 776                 case XFER_UDMA_2:   drive->id->dma_ultra |= 0x0404; break;
 777                 case XFER_UDMA_1:   drive->id->dma_ultra |= 0x0202; break;
 778                 case XFER_UDMA_0:   drive->id->dma_ultra |= 0x0101; break;
 779                 case XFER_MW_DMA_2: drive->id->dma_mword |= 0x0404; break;
 780                 case XFER_MW_DMA_1: drive->id->dma_mword |= 0x0202; break;
 781                 case XFER_MW_DMA_0: drive->id->dma_mword |= 0x0101; break;
 782                 case XFER_SW_DMA_2: drive->id->dma_1word |= 0x0404; break;
 783                 case XFER_SW_DMA_1: drive->id->dma_1word |= 0x0202; break;
 784                 case XFER_SW_DMA_0: drive->id->dma_1word |= 0x0101; break;
 785                 default: break;
 786         }
 787         if (!drive->init_speed)
 788                 drive->init_speed = speed;
 789         drive->current_speed = speed;
 790         return error;
 791 }
 792
 793 /*
 794  * This should get invoked any time we exit the driver to
 795  * wait for an interrupt response from a drive.  handler() points
 796  * at the appropriate code to handle the next interrupt, and a
 797  * timer is started to prevent us from waiting forever in case
 798  * something goes wrong (see the ide_timer_expiry() handler later on).
 799  *
 800  * See also ide_execute_command
 801  */
 802 static void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 803                       unsigned int timeout, ide_expiry_t *expiry)
 804 {
 805         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 806
 807         if (hwgroup->handler != NULL) {
 808                 printk(KERN_CRIT "%s: ide_set_handler: handler not null; "
 809                         "old=%p, new=%p\n",
 810                         drive->name, hwgroup->handler, handler);
 811         }
 812         hwgroup->handler        = handler;
 813         hwgroup->expiry         = expiry;
 814         hwgroup->timer.expires  = jiffies + timeout;
 815         hwgroup->req_gen_timer = hwgroup->req_gen;
 816         add_timer(&hwgroup->timer);
 817 }
 818
 819 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 820                       unsigned int timeout, ide_expiry_t *expiry)
 821 {
 822         unsigned long flags;
 823         spin_lock_irqsave(&ide_lock, flags);
 824         __ide_set_handler(drive, handler, timeout, expiry);
 825         spin_unlock_irqrestore(&ide_lock, flags);
 826 }
 827
 828 EXPORT_SYMBOL(ide_set_handler);
 829
 830 /**
 831  *      ide_execute_command     -       execute an IDE command
 832  *      @drive: IDE drive to issue the command against
 833  *      @command: command byte to write
 834  *      @handler: handler for next phase
 835  *      @timeout: timeout for command
 836  *      @expiry:  handler to run on timeout
 837  *
 838  *      Helper function to issue an IDE command. This handles the
 839  *      atomicity requirements, command timing and ensures that the
 840  *      handler and IRQ setup do not race. All IDE command kick off
 841  *      should go via this function or do equivalent locking.
 842  */
 843
 844 void ide_execute_command(ide_drive_t *drive, u8 cmd, ide_handler_t *handler,
 845                          unsigned timeout, ide_expiry_t *expiry)
 846 {
 847         unsigned long flags;
 848         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 849         ide_hwif_t *hwif = HWIF(drive);
 850
 851         spin_lock_irqsave(&ide_lock, flags);
 852         BUG_ON(hwgroup->handler);
 853         __ide_set_handler(drive, handler, timeout, expiry);
 854         hwif->OUTBSYNC(drive, cmd, IDE_COMMAND_REG);
 855         /*
 856          * Drive takes 400nS to respond, we must avoid the IRQ being
 857          * serviced before that.
 858          *
 859          * FIXME: we could skip this delay with care on non shared devices
 860          */
 861         ndelay(400);
 862         spin_unlock_irqrestore(&ide_lock, flags);
 863 }
 864
 865 EXPORT_SYMBOL(ide_execute_command);
 866
 867
 868 /* needed below */
 869 static ide_startstop_t do_reset1 (ide_drive_t *, int);
 870
 871 /*
 872  * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 873  * during an atapi drive reset operation. If the drive has not yet responded,
 874  * and we have not yet hit our maximum waiting time, then the timer is restarted
 875  * for another 50ms.
 876  */
 877 static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
 878 {
 879         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
 880         ide_hwif_t *hwif        = HWIF(drive);
 881         u8 stat;
 882
 883         SELECT_DRIVE(drive);
 884         udelay (10);
 885
 886         if (OK_STAT(stat = hwif->INB(IDE_STATUS_REG), 0, BUSY_STAT)) {
 887                 printk("%s: ATAPI reset complete\n", drive->name);
 888         } else {
 889                 if (time_before(jiffies, hwgroup->poll_timeout)) {
 890                         BUG_ON(HWGROUP(drive)->handler != NULL);
 891                         ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
 892                         /* continue polling */
 893                         return ide_started;
 894                 }
 895                 /* end of polling */
 896                 hwgroup->polling = 0;
 897                 printk("%s: ATAPI reset timed-out, status=0x%02x\n",
 898                                 drive->name, stat);
 899                 /* do it the old fashioned way */
 900                 return do_reset1(drive, 1);
 901         }
 902         /* done polling */
 903         hwgroup->polling = 0;
 904         hwgroup->resetting = 0;
 905         return ide_stopped;
 906 }
 907
 908 /*
 909  * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 910  * during an ide reset operation. If the drives have not yet responded,
 911  * and we have not yet hit our maximum waiting time, then the timer is restarted
 912  * for another 50ms.
 913  */
 914 static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
 915 {
 916         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
 917         ide_hwif_t *hwif        = HWIF(drive);
 918         u8 tmp;
 919
 920         if (hwif->reset_poll != NULL) {
 921                 if (hwif->reset_poll(drive)) {
 922                         printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
 923                                 hwif->name, drive->name);
 924                         return ide_stopped;
 925                 }
 926         }
 927
 928         if (!OK_STAT(tmp = hwif->INB(IDE_STATUS_REG), 0, BUSY_STAT)) {
 929                 if (time_before(jiffies, hwgroup->poll_timeout)) {
 930                         BUG_ON(HWGROUP(drive)->handler != NULL);
 931                         ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
 932                         /* continue polling */
 933                         return ide_started;
 934                 }
 935                 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
 936                 drive->failures++;
 937         } else  {
 938                 printk("%s: reset: ", hwif->name);
 939                 if ((tmp = hwif->INB(IDE_ERROR_REG)) == 1) {
 940                         printk("success\n");
 941                         drive->failures = 0;
 942                 } else {
 943                         drive->failures++;
 944                         printk("master: ");
 945                         switch (tmp & 0x7f) {
 946                                 case 1: printk("passed");
 947                                         break;
 948                                 case 2: printk("formatter device error");
 949                                         break;
 950                                 case 3: printk("sector buffer error");
 951                                         break;
 952                                 case 4: printk("ECC circuitry error");
 953                                         break;
 954                                 case 5: printk("controlling MPU error");
 955                                         break;
 956                                 default:printk("error (0x%02x?)", tmp);
 957                         }
 958                         if (tmp & 0x80)
 959                                 printk("; slave: failed");
 960                         printk("\n");
 961                 }
 962         }
 963         hwgroup->polling = 0;   /* done polling */
 964         hwgroup->resetting = 0; /* done reset attempt */
 965         return ide_stopped;
 966 }
 967
 968 static void check_dma_crc(ide_drive_t *drive)
 969 {
 970 #ifdef CONFIG_BLK_DEV_IDEDMA
 971         ide_dma_off_quietly(drive);
 972         ide_set_xfer_rate(drive, ide_auto_reduce_xfer(drive));
 973         if (drive->current_speed >= XFER_SW_DMA_0)
 974                 ide_dma_on(drive);
 975 #endif
 976 }
 977
 978 static void ide_disk_pre_reset(ide_drive_t *drive)
 979 {
 980         int legacy = (drive->id->cfs_enable_2 & 0x0400) ? 0 : 1;
 981
 982         drive->special.all = 0;
 983         drive->special.b.set_geometry = legacy;
 984         drive->special.b.recalibrate  = legacy;
 985         drive->mult_count = 0;
 986         if (!drive->keep_settings && !drive->using_dma)
 987                 drive->mult_req = 0;
 988         if (drive->mult_req != drive->mult_count)
 989                 drive->special.b.set_multmode = 1;
 990 }
 991
 992 static void pre_reset(ide_drive_t *drive)
 993 {
 994         if (drive->media == ide_disk)
 995                 ide_disk_pre_reset(drive);
 996         else
 997                 drive->post_reset = 1;
 998
 999         if (drive->using_dma) {
1000                 if (drive->crc_count)
1001                         check_dma_crc(drive);
1002                 else
1003                         ide_dma_off(drive);
1004         }
1005
1006         if (!drive->keep_settings) {
1007                 if (!drive->using_dma) {
1008                         drive->unmask = 0;
1009                         drive->io_32bit = 0;
1010                 }
1011                 return;
1012         }
1013
1014         if (HWIF(drive)->pre_reset != NULL)
1015                 HWIF(drive)->pre_reset(drive);
1016
1017         if (drive->current_speed != 0xff)
1018                 drive->desired_speed = drive->current_speed;
1019         drive->current_speed = 0xff;
1020 }
1021
1022 /*
1023  * do_reset1() attempts to recover a confused drive by resetting it.
1024  * Unfortunately, resetting a disk drive actually resets all devices on
1025  * the same interface, so it can really be thought of as resetting the
1026  * interface rather than resetting the drive.
1027  *
1028  * ATAPI devices have their own reset mechanism which allows them to be
1029  * individually reset without clobbering other devices on the same interface.
1030  *
1031  * Unfortunately, the IDE interface does not generate an interrupt to let
1032  * us know when the reset operation has finished, so we must poll for this.
1033  * Equally poor, though, is the fact that this may a very long time to complete,
1034  * (up to 30 seconds worstcase).  So, instead of busy-waiting here for it,
1035  * we set a timer to poll at 50ms intervals.
1036  */
1037 static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
1038 {
1039         unsigned int unit;
1040         unsigned long flags;
1041         ide_hwif_t *hwif;
1042         ide_hwgroup_t *hwgroup;
1043
1044         spin_lock_irqsave(&ide_lock, flags);
1045         hwif = HWIF(drive);
1046         hwgroup = HWGROUP(drive);
1047
1048         /* We must not reset with running handlers */
1049         BUG_ON(hwgroup->handler != NULL);
1050
1051         /* For an ATAPI device, first try an ATAPI SRST. */
1052         if (drive->media != ide_disk && !do_not_try_atapi) {
1053                 hwgroup->resetting = 1;
1054                 pre_reset(drive);
1055                 SELECT_DRIVE(drive);
1056                 udelay (20);
1057                 hwif->OUTBSYNC(drive, WIN_SRST, IDE_COMMAND_REG);
1058                 ndelay(400);
1059                 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1060                 hwgroup->polling = 1;
1061                 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1062                 spin_unlock_irqrestore(&ide_lock, flags);
1063                 return ide_started;
1064         }
1065
1066         /*
1067          * First, reset any device state data we were maintaining
1068          * for any of the drives on this interface.
1069          */
1070         for (unit = 0; unit < MAX_DRIVES; ++unit)
1071                 pre_reset(&hwif->drives[unit]);
1072
1073         if (!IDE_CONTROL_REG) {
1074                 spin_unlock_irqrestore(&ide_lock, flags);
1075                 return ide_stopped;
1076         }
1077
1078         hwgroup->resetting = 1;
1079         /*
1080          * Note that we also set nIEN while resetting the device,
1081          * to mask unwanted interrupts from the interface during the reset.
1082          * However, due to the design of PC hardware, this will cause an
1083          * immediate interrupt due to the edge transition it produces.
1084          * This single interrupt gives us a "fast poll" for drives that
1085          * recover from reset very quickly, saving us the first 50ms wait time.
1086          */
1087         /* set SRST and nIEN */
1088         hwif->OUTBSYNC(drive, drive->ctl|6,IDE_CONTROL_REG);
1089         /* more than enough time */
1090         udelay(10);
1091         if (drive->quirk_list == 2) {
1092                 /* clear SRST and nIEN */
1093                 hwif->OUTBSYNC(drive, drive->ctl, IDE_CONTROL_REG);
1094         } else {
1095                 /* clear SRST, leave nIEN */
1096                 hwif->OUTBSYNC(drive, drive->ctl|2, IDE_CONTROL_REG);
1097         }
1098         /* more than enough time */
1099         udelay(10);
1100         hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1101         hwgroup->polling = 1;
1102         __ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1103
1104         /*
1105          * Some weird controller like resetting themselves to a strange
1106          * state when the disks are reset this way. At least, the Winbond
1107          * 553 documentation says that
1108          */
1109         if (hwif->resetproc)
1110                 hwif->resetproc(drive);
1111
1112         spin_unlock_irqrestore(&ide_lock, flags);
1113         return ide_started;
1114 }
1115
1116 /*
1117  * ide_do_reset() is the entry point to the drive/interface reset code.
1118  */
1119
1120 ide_startstop_t ide_do_reset (ide_drive_t *drive)
1121 {
1122         return do_reset1(drive, 0);
1123 }
1124
1125 EXPORT_SYMBOL(ide_do_reset);
1126
1127 /*
1128  * ide_wait_not_busy() waits for the currently selected device on the hwif
1129  * to report a non-busy status, see comments in ide_probe_port().
1130  */
1131 int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
1132 {
1133         u8 stat = 0;
1134
1135         while(timeout--) {
1136                 /*
1137                  * Turn this into a schedule() sleep once I'm sure
1138                  * about locking issues (2.5 work ?).
1139                  */
1140                 mdelay(1);
1141                 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
1142                 if ((stat & BUSY_STAT) == 0)
1143                         return 0;
1144                 /*
1145                  * Assume a value of 0xff means nothing is connected to
1146                  * the interface and it doesn't implement the pull-down
1147                  * resistor on D7.
1148                  */
1149                 if (stat == 0xff)
1150                         return -ENODEV;
1151                 touch_softlockup_watchdog();
1152                 touch_nmi_watchdog();
1153         }
1154         return -EBUSY;
1155 }
1156
1157 EXPORT_SYMBOL_GPL(ide_wait_not_busy);
1158