git.oblomov.eu Git - linux-2.6/blob - 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         ide_hwif_t *hwif = drive->hwif;
 162
 163         if (hwif->selectproc)
 164                 hwif->selectproc(drive);
 165
 166         hwif->OUTB(drive->select.all, hwif->io_ports[IDE_SELECT_OFFSET]);
 167 }
 168
 169 void SELECT_MASK (ide_drive_t *drive, int mask)
 170 {
 171         if (HWIF(drive)->maskproc)
 172                 HWIF(drive)->maskproc(drive, mask);
 173 }
 174
 175 /*
 176  * Some localbus EIDE interfaces require a special access sequence
 177  * when using 32-bit I/O instructions to transfer data.  We call this
 178  * the "vlb_sync" sequence, which consists of three successive reads
 179  * of the sector count register location, with interrupts disabled
 180  * to ensure that the reads all happen together.
 181  */
 182 static void ata_vlb_sync(ide_drive_t *drive, unsigned long port)
 183 {
 184         (void) HWIF(drive)->INB(port);
 185         (void) HWIF(drive)->INB(port);
 186         (void) HWIF(drive)->INB(port);
 187 }
 188
 189 /*
 190  * This is used for most PIO data transfers *from* the IDE interface
 191  */
 192 static void ata_input_data(ide_drive_t *drive, void *buffer, u32 wcount)
 193 {
 194         ide_hwif_t *hwif        = HWIF(drive);
 195         u8 io_32bit             = drive->io_32bit;
 196
 197         if (io_32bit) {
 198                 if (io_32bit & 2) {
 199                         unsigned long flags;
 200
 201                         local_irq_save(flags);
 202                         ata_vlb_sync(drive, hwif->io_ports[IDE_NSECTOR_OFFSET]);
 203                         hwif->INSL(hwif->io_ports[IDE_DATA_OFFSET], buffer,
 204                                    wcount);
 205                         local_irq_restore(flags);
 206                 } else
 207                         hwif->INSL(hwif->io_ports[IDE_DATA_OFFSET], buffer,
 208                                    wcount);
 209         } else
 210                 hwif->INSW(hwif->io_ports[IDE_DATA_OFFSET], buffer,
 211                            wcount << 1);
 212 }
 213
 214 /*
 215  * This is used for most PIO data transfers *to* the IDE interface
 216  */
 217 static void ata_output_data(ide_drive_t *drive, void *buffer, u32 wcount)
 218 {
 219         ide_hwif_t *hwif        = HWIF(drive);
 220         u8 io_32bit             = drive->io_32bit;
 221
 222         if (io_32bit) {
 223                 if (io_32bit & 2) {
 224                         unsigned long flags;
 225
 226                         local_irq_save(flags);
 227                         ata_vlb_sync(drive, hwif->io_ports[IDE_NSECTOR_OFFSET]);
 228                         hwif->OUTSL(hwif->io_ports[IDE_DATA_OFFSET], buffer,
 229                                     wcount);
 230                         local_irq_restore(flags);
 231                 } else
 232                         hwif->OUTSL(hwif->io_ports[IDE_DATA_OFFSET], buffer,
 233                                     wcount);
 234         } else
 235                 hwif->OUTSW(hwif->io_ports[IDE_DATA_OFFSET], buffer,
 236                             wcount << 1);
 237 }
 238
 239 /*
 240  * The following routines are mainly used by the ATAPI drivers.
 241  *
 242  * These routines will round up any request for an odd number of bytes,
 243  * so if an odd bytecount is specified, be sure that there's at least one
 244  * extra byte allocated for the buffer.
 245  */
 246
 247 static void atapi_input_bytes(ide_drive_t *drive, void *buffer, u32 bytecount)
 248 {
 249         ide_hwif_t *hwif = HWIF(drive);
 250
 251         ++bytecount;
 252 #if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
 253         if (MACH_IS_ATARI || MACH_IS_Q40) {
 254                 /* Atari has a byte-swapped IDE interface */
 255                 insw_swapw(hwif->io_ports[IDE_DATA_OFFSET], buffer,
 256                            bytecount / 2);
 257                 return;
 258         }
 259 #endif /* CONFIG_ATARI || CONFIG_Q40 */
 260         hwif->ata_input_data(drive, buffer, bytecount / 4);
 261         if ((bytecount & 0x03) >= 2)
 262                 hwif->INSW(hwif->io_ports[IDE_DATA_OFFSET],
 263                            (u8 *)buffer + (bytecount & ~0x03), 1);
 264 }
 265
 266 static void atapi_output_bytes(ide_drive_t *drive, void *buffer, u32 bytecount)
 267 {
 268         ide_hwif_t *hwif = HWIF(drive);
 269
 270         ++bytecount;
 271 #if defined(CONFIG_ATARI) || defined(CONFIG_Q40)
 272         if (MACH_IS_ATARI || MACH_IS_Q40) {
 273                 /* Atari has a byte-swapped IDE interface */
 274                 outsw_swapw(hwif->io_ports[IDE_DATA_OFFSET], buffer,
 275                             bytecount / 2);
 276                 return;
 277         }
 278 #endif /* CONFIG_ATARI || CONFIG_Q40 */
 279         hwif->ata_output_data(drive, buffer, bytecount / 4);
 280         if ((bytecount & 0x03) >= 2)
 281                 hwif->OUTSW(hwif->io_ports[IDE_DATA_OFFSET],
 282                             (u8 *)buffer + (bytecount & ~0x03), 1);
 283 }
 284
 285 void default_hwif_transport(ide_hwif_t *hwif)
 286 {
 287         hwif->ata_input_data            = ata_input_data;
 288         hwif->ata_output_data           = ata_output_data;
 289         hwif->atapi_input_bytes         = atapi_input_bytes;
 290         hwif->atapi_output_bytes        = atapi_output_bytes;
 291 }
 292
 293 void ide_fix_driveid (struct hd_driveid *id)
 294 {
 295 #ifndef __LITTLE_ENDIAN
 296 # ifdef __BIG_ENDIAN
 297         int i;
 298         u16 *stringcast;
 299
 300         id->config         = __le16_to_cpu(id->config);
 301         id->cyls           = __le16_to_cpu(id->cyls);
 302         id->reserved2      = __le16_to_cpu(id->reserved2);
 303         id->heads          = __le16_to_cpu(id->heads);
 304         id->track_bytes    = __le16_to_cpu(id->track_bytes);
 305         id->sector_bytes   = __le16_to_cpu(id->sector_bytes);
 306         id->sectors        = __le16_to_cpu(id->sectors);
 307         id->vendor0        = __le16_to_cpu(id->vendor0);
 308         id->vendor1        = __le16_to_cpu(id->vendor1);
 309         id->vendor2        = __le16_to_cpu(id->vendor2);
 310         stringcast = (u16 *)&id->serial_no[0];
 311         for (i = 0; i < (20/2); i++)
 312                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 313         id->buf_type       = __le16_to_cpu(id->buf_type);
 314         id->buf_size       = __le16_to_cpu(id->buf_size);
 315         id->ecc_bytes      = __le16_to_cpu(id->ecc_bytes);
 316         stringcast = (u16 *)&id->fw_rev[0];
 317         for (i = 0; i < (8/2); i++)
 318                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 319         stringcast = (u16 *)&id->model[0];
 320         for (i = 0; i < (40/2); i++)
 321                 stringcast[i] = __le16_to_cpu(stringcast[i]);
 322         id->dword_io       = __le16_to_cpu(id->dword_io);
 323         id->reserved50     = __le16_to_cpu(id->reserved50);
 324         id->field_valid    = __le16_to_cpu(id->field_valid);
 325         id->cur_cyls       = __le16_to_cpu(id->cur_cyls);
 326         id->cur_heads      = __le16_to_cpu(id->cur_heads);
 327         id->cur_sectors    = __le16_to_cpu(id->cur_sectors);
 328         id->cur_capacity0  = __le16_to_cpu(id->cur_capacity0);
 329         id->cur_capacity1  = __le16_to_cpu(id->cur_capacity1);
 330         id->lba_capacity   = __le32_to_cpu(id->lba_capacity);
 331         id->dma_1word      = __le16_to_cpu(id->dma_1word);
 332         id->dma_mword      = __le16_to_cpu(id->dma_mword);
 333         id->eide_pio_modes = __le16_to_cpu(id->eide_pio_modes);
 334         id->eide_dma_min   = __le16_to_cpu(id->eide_dma_min);
 335         id->eide_dma_time  = __le16_to_cpu(id->eide_dma_time);
 336         id->eide_pio       = __le16_to_cpu(id->eide_pio);
 337         id->eide_pio_iordy = __le16_to_cpu(id->eide_pio_iordy);
 338         for (i = 0; i < 2; ++i)
 339                 id->words69_70[i] = __le16_to_cpu(id->words69_70[i]);
 340         for (i = 0; i < 4; ++i)
 341                 id->words71_74[i] = __le16_to_cpu(id->words71_74[i]);
 342         id->queue_depth    = __le16_to_cpu(id->queue_depth);
 343         for (i = 0; i < 4; ++i)
 344                 id->words76_79[i] = __le16_to_cpu(id->words76_79[i]);
 345         id->major_rev_num  = __le16_to_cpu(id->major_rev_num);
 346         id->minor_rev_num  = __le16_to_cpu(id->minor_rev_num);
 347         id->command_set_1  = __le16_to_cpu(id->command_set_1);
 348         id->command_set_2  = __le16_to_cpu(id->command_set_2);
 349         id->cfsse          = __le16_to_cpu(id->cfsse);
 350         id->cfs_enable_1   = __le16_to_cpu(id->cfs_enable_1);
 351         id->cfs_enable_2   = __le16_to_cpu(id->cfs_enable_2);
 352         id->csf_default    = __le16_to_cpu(id->csf_default);
 353         id->dma_ultra      = __le16_to_cpu(id->dma_ultra);
 354         id->trseuc         = __le16_to_cpu(id->trseuc);
 355         id->trsEuc         = __le16_to_cpu(id->trsEuc);
 356         id->CurAPMvalues   = __le16_to_cpu(id->CurAPMvalues);
 357         id->mprc           = __le16_to_cpu(id->mprc);
 358         id->hw_config      = __le16_to_cpu(id->hw_config);
 359         id->acoustic       = __le16_to_cpu(id->acoustic);
 360         id->msrqs          = __le16_to_cpu(id->msrqs);
 361         id->sxfert         = __le16_to_cpu(id->sxfert);
 362         id->sal            = __le16_to_cpu(id->sal);
 363         id->spg            = __le32_to_cpu(id->spg);
 364         id->lba_capacity_2 = __le64_to_cpu(id->lba_capacity_2);
 365         for (i = 0; i < 22; i++)
 366                 id->words104_125[i]   = __le16_to_cpu(id->words104_125[i]);
 367         id->last_lun       = __le16_to_cpu(id->last_lun);
 368         id->word127        = __le16_to_cpu(id->word127);
 369         id->dlf            = __le16_to_cpu(id->dlf);
 370         id->csfo           = __le16_to_cpu(id->csfo);
 371         for (i = 0; i < 26; i++)
 372                 id->words130_155[i] = __le16_to_cpu(id->words130_155[i]);
 373         id->word156        = __le16_to_cpu(id->word156);
 374         for (i = 0; i < 3; i++)
 375                 id->words157_159[i] = __le16_to_cpu(id->words157_159[i]);
 376         id->cfa_power      = __le16_to_cpu(id->cfa_power);
 377         for (i = 0; i < 14; i++)
 378                 id->words161_175[i] = __le16_to_cpu(id->words161_175[i]);
 379         for (i = 0; i < 31; i++)
 380                 id->words176_205[i] = __le16_to_cpu(id->words176_205[i]);
 381         for (i = 0; i < 48; i++)
 382                 id->words206_254[i] = __le16_to_cpu(id->words206_254[i]);
 383         id->integrity_word  = __le16_to_cpu(id->integrity_word);
 384 # else
 385 #  error "Please fix <asm/byteorder.h>"
 386 # endif
 387 #endif
 388 }
 389
 390 /*
 391  * ide_fixstring() cleans up and (optionally) byte-swaps a text string,
 392  * removing leading/trailing blanks and compressing internal blanks.
 393  * It is primarily used to tidy up the model name/number fields as
 394  * returned by the WIN_[P]IDENTIFY commands.
 395  */
 396
 397 void ide_fixstring (u8 *s, const int bytecount, const int byteswap)
 398 {
 399         u8 *p = s, *end = &s[bytecount & ~1]; /* bytecount must be even */
 400
 401         if (byteswap) {
 402                 /* convert from big-endian to host byte order */
 403                 for (p = end ; p != s;) {
 404                         unsigned short *pp = (unsigned short *) (p -= 2);
 405                         *pp = ntohs(*pp);
 406                 }
 407         }
 408         /* strip leading blanks */
 409         while (s != end && *s == ' ')
 410                 ++s;
 411         /* compress internal blanks and strip trailing blanks */
 412         while (s != end && *s) {
 413                 if (*s++ != ' ' || (s != end && *s && *s != ' '))
 414                         *p++ = *(s-1);
 415         }
 416         /* wipe out trailing garbage */
 417         while (p != end)
 418                 *p++ = '\0';
 419 }
 420
 421 EXPORT_SYMBOL(ide_fixstring);
 422
 423 /*
 424  * Needed for PCI irq sharing
 425  */
 426 int drive_is_ready (ide_drive_t *drive)
 427 {
 428         ide_hwif_t *hwif        = HWIF(drive);
 429         u8 stat                 = 0;
 430
 431         if (drive->waiting_for_dma)
 432                 return hwif->ide_dma_test_irq(drive);
 433
 434 #if 0
 435         /* need to guarantee 400ns since last command was issued */
 436         udelay(1);
 437 #endif
 438
 439         /*
 440          * We do a passive status test under shared PCI interrupts on
 441          * cards that truly share the ATA side interrupt, but may also share
 442          * an interrupt with another pci card/device.  We make no assumptions
 443          * about possible isa-pnp and pci-pnp issues yet.
 444          */
 445         if (hwif->io_ports[IDE_CONTROL_OFFSET])
 446                 stat = ide_read_altstatus(drive);
 447         else
 448                 /* Note: this may clear a pending IRQ!! */
 449                 stat = ide_read_status(drive);
 450
 451         if (stat & BUSY_STAT)
 452                 /* drive busy:  definitely not interrupting */
 453                 return 0;
 454
 455         /* drive ready: *might* be interrupting */
 456         return 1;
 457 }
 458
 459 EXPORT_SYMBOL(drive_is_ready);
 460
 461 /*
 462  * This routine busy-waits for the drive status to be not "busy".
 463  * It then checks the status for all of the "good" bits and none
 464  * of the "bad" bits, and if all is okay it returns 0.  All other
 465  * cases return error -- caller may then invoke ide_error().
 466  *
 467  * This routine should get fixed to not hog the cpu during extra long waits..
 468  * That could be done by busy-waiting for the first jiffy or two, and then
 469  * setting a timer to wake up at half second intervals thereafter,
 470  * until timeout is achieved, before timing out.
 471  */
 472 static int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout, u8 *rstat)
 473 {
 474         unsigned long flags;
 475         int i;
 476         u8 stat;
 477
 478         udelay(1);      /* spec allows drive 400ns to assert "BUSY" */
 479         stat = ide_read_status(drive);
 480
 481         if (stat & BUSY_STAT) {
 482                 local_irq_set(flags);
 483                 timeout += jiffies;
 484                 while ((stat = ide_read_status(drive)) & BUSY_STAT) {
 485                         if (time_after(jiffies, timeout)) {
 486                                 /*
 487                                  * One last read after the timeout in case
 488                                  * heavy interrupt load made us not make any
 489                                  * progress during the timeout..
 490                                  */
 491                                 stat = ide_read_status(drive);
 492                                 if (!(stat & BUSY_STAT))
 493                                         break;
 494
 495                                 local_irq_restore(flags);
 496                                 *rstat = stat;
 497                                 return -EBUSY;
 498                         }
 499                 }
 500                 local_irq_restore(flags);
 501         }
 502         /*
 503          * Allow status to settle, then read it again.
 504          * A few rare drives vastly violate the 400ns spec here,
 505          * so we'll wait up to 10usec for a "good" status
 506          * rather than expensively fail things immediately.
 507          * This fix courtesy of Matthew Faupel & Niccolo Rigacci.
 508          */
 509         for (i = 0; i < 10; i++) {
 510                 udelay(1);
 511                 stat = ide_read_status(drive);
 512
 513                 if (OK_STAT(stat, good, bad)) {
 514                         *rstat = stat;
 515                         return 0;
 516                 }
 517         }
 518         *rstat = stat;
 519         return -EFAULT;
 520 }
 521
 522 /*
 523  * In case of error returns error value after doing "*startstop = ide_error()".
 524  * The caller should return the updated value of "startstop" in this case,
 525  * "startstop" is unchanged when the function returns 0.
 526  */
 527 int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout)
 528 {
 529         int err;
 530         u8 stat;
 531
 532         /* bail early if we've exceeded max_failures */
 533         if (drive->max_failures && (drive->failures > drive->max_failures)) {
 534                 *startstop = ide_stopped;
 535                 return 1;
 536         }
 537
 538         err = __ide_wait_stat(drive, good, bad, timeout, &stat);
 539
 540         if (err) {
 541                 char *s = (err == -EBUSY) ? "status timeout" : "status error";
 542                 *startstop = ide_error(drive, s, stat);
 543         }
 544
 545         return err;
 546 }
 547
 548 EXPORT_SYMBOL(ide_wait_stat);
 549
 550 /**
 551  *      ide_in_drive_list       -       look for drive in black/white list
 552  *      @id: drive identifier
 553  *      @drive_table: list to inspect
 554  *
 555  *      Look for a drive in the blacklist and the whitelist tables
 556  *      Returns 1 if the drive is found in the table.
 557  */
 558
 559 int ide_in_drive_list(struct hd_driveid *id, const struct drive_list_entry *drive_table)
 560 {
 561         for ( ; drive_table->id_model; drive_table++)
 562                 if ((!strcmp(drive_table->id_model, id->model)) &&
 563                     (!drive_table->id_firmware ||
 564                      strstr(id->fw_rev, drive_table->id_firmware)))
 565                         return 1;
 566         return 0;
 567 }
 568
 569 EXPORT_SYMBOL_GPL(ide_in_drive_list);
 570
 571 /*
 572  * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid.
 573  * We list them here and depend on the device side cable detection for them.
 574  *
 575  * Some optical devices with the buggy firmwares have the same problem.
 576  */
 577 static const struct drive_list_entry ivb_list[] = {
 578         { "QUANTUM FIREBALLlct10 05"    , "A03.0900"    },
 579         { "TSSTcorp CDDVDW SH-S202J"    , "SB00"        },
 580         { "TSSTcorp CDDVDW SH-S202J"    , "SB01"        },
 581         { "TSSTcorp CDDVDW SH-S202N"    , "SB00"        },
 582         { "TSSTcorp CDDVDW SH-S202N"    , "SB01"        },
 583         { NULL                          , NULL          }
 584 };
 585
 586 /*
 587  *  All hosts that use the 80c ribbon must use!
 588  *  The name is derived from upper byte of word 93 and the 80c ribbon.
 589  */
 590 u8 eighty_ninty_three (ide_drive_t *drive)
 591 {
 592         ide_hwif_t *hwif = drive->hwif;
 593         struct hd_driveid *id = drive->id;
 594         int ivb = ide_in_drive_list(id, ivb_list);
 595
 596         if (hwif->cbl == ATA_CBL_PATA40_SHORT)
 597                 return 1;
 598
 599         if (ivb)
 600                 printk(KERN_DEBUG "%s: skipping word 93 validity check\n",
 601                                   drive->name);
 602
 603         if (ide_dev_is_sata(id) && !ivb)
 604                 return 1;
 605
 606         if (hwif->cbl != ATA_CBL_PATA80 && !ivb)
 607                 goto no_80w;
 608
 609         /*
 610          * FIXME:
 611          * - change master/slave IDENTIFY order
 612          * - force bit13 (80c cable present) check also for !ivb devices
 613          *   (unless the slave device is pre-ATA3)
 614          */
 615         if ((id->hw_config & 0x4000) || (ivb && (id->hw_config & 0x2000)))
 616                 return 1;
 617
 618 no_80w:
 619         if (drive->udma33_warned == 1)
 620                 return 0;
 621
 622         printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, "
 623                             "limiting max speed to UDMA33\n",
 624                             drive->name,
 625                             hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host");
 626
 627         drive->udma33_warned = 1;
 628
 629         return 0;
 630 }
 631
 632 int ide_driveid_update(ide_drive_t *drive)
 633 {
 634         ide_hwif_t *hwif = drive->hwif;
 635         struct hd_driveid *id;
 636         unsigned long timeout, flags;
 637         u8 stat;
 638
 639         /*
 640          * Re-read drive->id for possible DMA mode
 641          * change (copied from ide-probe.c)
 642          */
 643
 644         SELECT_MASK(drive, 1);
 645         ide_set_irq(drive, 1);
 646         msleep(50);
 647         hwif->OUTB(WIN_IDENTIFY, hwif->io_ports[IDE_COMMAND_OFFSET]);
 648         timeout = jiffies + WAIT_WORSTCASE;
 649         do {
 650                 if (time_after(jiffies, timeout)) {
 651                         SELECT_MASK(drive, 0);
 652                         return 0;       /* drive timed-out */
 653                 }
 654
 655                 msleep(50);     /* give drive a breather */
 656                 stat = ide_read_altstatus(drive);
 657         } while (stat & BUSY_STAT);
 658
 659         msleep(50);     /* wait for IRQ and DRQ_STAT */
 660         stat = ide_read_status(drive);
 661
 662         if (!OK_STAT(stat, DRQ_STAT, BAD_R_STAT)) {
 663                 SELECT_MASK(drive, 0);
 664                 printk("%s: CHECK for good STATUS\n", drive->name);
 665                 return 0;
 666         }
 667         local_irq_save(flags);
 668         SELECT_MASK(drive, 0);
 669         id = kmalloc(SECTOR_WORDS*4, GFP_ATOMIC);
 670         if (!id) {
 671                 local_irq_restore(flags);
 672                 return 0;
 673         }
 674         hwif->ata_input_data(drive, id, SECTOR_WORDS);
 675         (void)ide_read_status(drive);   /* clear drive IRQ */
 676         local_irq_enable();
 677         local_irq_restore(flags);
 678         ide_fix_driveid(id);
 679         if (id) {
 680                 drive->id->dma_ultra = id->dma_ultra;
 681                 drive->id->dma_mword = id->dma_mword;
 682                 drive->id->dma_1word = id->dma_1word;
 683                 /* anything more ? */
 684                 kfree(id);
 685
 686                 if (drive->using_dma && ide_id_dma_bug(drive))
 687                         ide_dma_off(drive);
 688         }
 689
 690         return 1;
 691 }
 692
 693 int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
 694 {
 695         ide_hwif_t *hwif = drive->hwif;
 696         int error = 0;
 697         u8 stat;
 698
 699 //      while (HWGROUP(drive)->busy)
 700 //              msleep(50);
 701
 702 #ifdef CONFIG_BLK_DEV_IDEDMA
 703         if (hwif->dma_host_set) /* check if host supports DMA */
 704                 hwif->dma_host_set(drive, 0);
 705 #endif
 706
 707         /* Skip setting PIO flow-control modes on pre-EIDE drives */
 708         if ((speed & 0xf8) == XFER_PIO_0 && !(drive->id->capability & 0x08))
 709                 goto skip;
 710
 711         /*
 712          * Don't use ide_wait_cmd here - it will
 713          * attempt to set_geometry and recalibrate,
 714          * but for some reason these don't work at
 715          * this point (lost interrupt).
 716          */
 717         /*
 718          * Select the drive, and issue the SETFEATURES command
 719          */
 720         disable_irq_nosync(hwif->irq);
 721
 722         /*
 723          *      FIXME: we race against the running IRQ here if
 724          *      this is called from non IRQ context. If we use
 725          *      disable_irq() we hang on the error path. Work
 726          *      is needed.
 727          */
 728
 729         udelay(1);
 730         SELECT_DRIVE(drive);
 731         SELECT_MASK(drive, 0);
 732         udelay(1);
 733         ide_set_irq(drive, 0);
 734         hwif->OUTB(speed, hwif->io_ports[IDE_NSECTOR_OFFSET]);
 735         hwif->OUTB(SETFEATURES_XFER, hwif->io_ports[IDE_FEATURE_OFFSET]);
 736         hwif->OUTBSYNC(drive, WIN_SETFEATURES,
 737                        hwif->io_ports[IDE_COMMAND_OFFSET]);
 738         if (drive->quirk_list == 2)
 739                 ide_set_irq(drive, 1);
 740
 741         error = __ide_wait_stat(drive, drive->ready_stat,
 742                                 BUSY_STAT|DRQ_STAT|ERR_STAT,
 743                                 WAIT_CMD, &stat);
 744
 745         SELECT_MASK(drive, 0);
 746
 747         enable_irq(hwif->irq);
 748
 749         if (error) {
 750                 (void) ide_dump_status(drive, "set_drive_speed_status", stat);
 751                 return error;
 752         }
 753
 754         drive->id->dma_ultra &= ~0xFF00;
 755         drive->id->dma_mword &= ~0x0F00;
 756         drive->id->dma_1word &= ~0x0F00;
 757
 758  skip:
 759 #ifdef CONFIG_BLK_DEV_IDEDMA
 760         if ((speed >= XFER_SW_DMA_0 || (hwif->host_flags & IDE_HFLAG_VDMA)) &&
 761             drive->using_dma)
 762                 hwif->dma_host_set(drive, 1);
 763         else if (hwif->dma_host_set)    /* check if host supports DMA */
 764                 ide_dma_off_quietly(drive);
 765 #endif
 766
 767         switch(speed) {
 768                 case XFER_UDMA_7:   drive->id->dma_ultra |= 0x8080; break;
 769                 case XFER_UDMA_6:   drive->id->dma_ultra |= 0x4040; break;
 770                 case XFER_UDMA_5:   drive->id->dma_ultra |= 0x2020; break;
 771                 case XFER_UDMA_4:   drive->id->dma_ultra |= 0x1010; break;
 772                 case XFER_UDMA_3:   drive->id->dma_ultra |= 0x0808; break;
 773                 case XFER_UDMA_2:   drive->id->dma_ultra |= 0x0404; break;
 774                 case XFER_UDMA_1:   drive->id->dma_ultra |= 0x0202; break;
 775                 case XFER_UDMA_0:   drive->id->dma_ultra |= 0x0101; break;
 776                 case XFER_MW_DMA_2: drive->id->dma_mword |= 0x0404; break;
 777                 case XFER_MW_DMA_1: drive->id->dma_mword |= 0x0202; break;
 778                 case XFER_MW_DMA_0: drive->id->dma_mword |= 0x0101; break;
 779                 case XFER_SW_DMA_2: drive->id->dma_1word |= 0x0404; break;
 780                 case XFER_SW_DMA_1: drive->id->dma_1word |= 0x0202; break;
 781                 case XFER_SW_DMA_0: drive->id->dma_1word |= 0x0101; break;
 782                 default: break;
 783         }
 784         if (!drive->init_speed)
 785                 drive->init_speed = speed;
 786         drive->current_speed = speed;
 787         return error;
 788 }
 789
 790 /*
 791  * This should get invoked any time we exit the driver to
 792  * wait for an interrupt response from a drive.  handler() points
 793  * at the appropriate code to handle the next interrupt, and a
 794  * timer is started to prevent us from waiting forever in case
 795  * something goes wrong (see the ide_timer_expiry() handler later on).
 796  *
 797  * See also ide_execute_command
 798  */
 799 static void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 800                       unsigned int timeout, ide_expiry_t *expiry)
 801 {
 802         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 803
 804         BUG_ON(hwgroup->handler);
 805         hwgroup->handler        = handler;
 806         hwgroup->expiry         = expiry;
 807         hwgroup->timer.expires  = jiffies + timeout;
 808         hwgroup->req_gen_timer  = hwgroup->req_gen;
 809         add_timer(&hwgroup->timer);
 810 }
 811
 812 void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler,
 813                       unsigned int timeout, ide_expiry_t *expiry)
 814 {
 815         unsigned long flags;
 816         spin_lock_irqsave(&ide_lock, flags);
 817         __ide_set_handler(drive, handler, timeout, expiry);
 818         spin_unlock_irqrestore(&ide_lock, flags);
 819 }
 820
 821 EXPORT_SYMBOL(ide_set_handler);
 822
 823 /**
 824  *      ide_execute_command     -       execute an IDE command
 825  *      @drive: IDE drive to issue the command against
 826  *      @command: command byte to write
 827  *      @handler: handler for next phase
 828  *      @timeout: timeout for command
 829  *      @expiry:  handler to run on timeout
 830  *
 831  *      Helper function to issue an IDE command. This handles the
 832  *      atomicity requirements, command timing and ensures that the
 833  *      handler and IRQ setup do not race. All IDE command kick off
 834  *      should go via this function or do equivalent locking.
 835  */
 836
 837 void ide_execute_command(ide_drive_t *drive, u8 cmd, ide_handler_t *handler,
 838                          unsigned timeout, ide_expiry_t *expiry)
 839 {
 840         unsigned long flags;
 841         ide_hwif_t *hwif = HWIF(drive);
 842
 843         spin_lock_irqsave(&ide_lock, flags);
 844         __ide_set_handler(drive, handler, timeout, expiry);
 845         hwif->OUTBSYNC(drive, cmd, hwif->io_ports[IDE_COMMAND_OFFSET]);
 846         /*
 847          * Drive takes 400nS to respond, we must avoid the IRQ being
 848          * serviced before that.
 849          *
 850          * FIXME: we could skip this delay with care on non shared devices
 851          */
 852         ndelay(400);
 853         spin_unlock_irqrestore(&ide_lock, flags);
 854 }
 855
 856 EXPORT_SYMBOL(ide_execute_command);
 857
 858
 859 /* needed below */
 860 static ide_startstop_t do_reset1 (ide_drive_t *, int);
 861
 862 /*
 863  * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 864  * during an atapi drive reset operation. If the drive has not yet responded,
 865  * and we have not yet hit our maximum waiting time, then the timer is restarted
 866  * for another 50ms.
 867  */
 868 static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
 869 {
 870         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
 871         u8 stat;
 872
 873         SELECT_DRIVE(drive);
 874         udelay (10);
 875         stat = ide_read_status(drive);
 876
 877         if (OK_STAT(stat, 0, BUSY_STAT))
 878                 printk("%s: ATAPI reset complete\n", drive->name);
 879         else {
 880                 if (time_before(jiffies, hwgroup->poll_timeout)) {
 881                         ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
 882                         /* continue polling */
 883                         return ide_started;
 884                 }
 885                 /* end of polling */
 886                 hwgroup->polling = 0;
 887                 printk("%s: ATAPI reset timed-out, status=0x%02x\n",
 888                                 drive->name, stat);
 889                 /* do it the old fashioned way */
 890                 return do_reset1(drive, 1);
 891         }
 892         /* done polling */
 893         hwgroup->polling = 0;
 894         hwgroup->resetting = 0;
 895         return ide_stopped;
 896 }
 897
 898 /*
 899  * reset_pollfunc() gets invoked to poll the interface for completion every 50ms
 900  * during an ide reset operation. If the drives have not yet responded,
 901  * and we have not yet hit our maximum waiting time, then the timer is restarted
 902  * for another 50ms.
 903  */
 904 static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
 905 {
 906         ide_hwgroup_t *hwgroup  = HWGROUP(drive);
 907         ide_hwif_t *hwif        = HWIF(drive);
 908         u8 tmp;
 909
 910         if (hwif->reset_poll != NULL) {
 911                 if (hwif->reset_poll(drive)) {
 912                         printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
 913                                 hwif->name, drive->name);
 914                         return ide_stopped;
 915                 }
 916         }
 917
 918         tmp = ide_read_status(drive);
 919
 920         if (!OK_STAT(tmp, 0, BUSY_STAT)) {
 921                 if (time_before(jiffies, hwgroup->poll_timeout)) {
 922                         ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
 923                         /* continue polling */
 924                         return ide_started;
 925                 }
 926                 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
 927                 drive->failures++;
 928         } else  {
 929                 printk("%s: reset: ", hwif->name);
 930                 tmp = ide_read_error(drive);
 931
 932                 if (tmp == 1) {
 933                         printk("success\n");
 934                         drive->failures = 0;
 935                 } else {
 936                         drive->failures++;
 937                         printk("master: ");
 938                         switch (tmp & 0x7f) {
 939                                 case 1: printk("passed");
 940                                         break;
 941                                 case 2: printk("formatter device error");
 942                                         break;
 943                                 case 3: printk("sector buffer error");
 944                                         break;
 945                                 case 4: printk("ECC circuitry error");
 946                                         break;
 947                                 case 5: printk("controlling MPU error");
 948                                         break;
 949                                 default:printk("error (0x%02x?)", tmp);
 950                         }
 951                         if (tmp & 0x80)
 952                                 printk("; slave: failed");
 953                         printk("\n");
 954                 }
 955         }
 956         hwgroup->polling = 0;   /* done polling */
 957         hwgroup->resetting = 0; /* done reset attempt */
 958         return ide_stopped;
 959 }
 960
 961 static void ide_disk_pre_reset(ide_drive_t *drive)
 962 {
 963         int legacy = (drive->id->cfs_enable_2 & 0x0400) ? 0 : 1;
 964
 965         drive->special.all = 0;
 966         drive->special.b.set_geometry = legacy;
 967         drive->special.b.recalibrate  = legacy;
 968         drive->mult_count = 0;
 969         if (!drive->keep_settings && !drive->using_dma)
 970                 drive->mult_req = 0;
 971         if (drive->mult_req != drive->mult_count)
 972                 drive->special.b.set_multmode = 1;
 973 }
 974
 975 static void pre_reset(ide_drive_t *drive)
 976 {
 977         if (drive->media == ide_disk)
 978                 ide_disk_pre_reset(drive);
 979         else
 980                 drive->post_reset = 1;
 981
 982         if (drive->using_dma) {
 983                 if (drive->crc_count)
 984                         ide_check_dma_crc(drive);
 985                 else
 986                         ide_dma_off(drive);
 987         }
 988
 989         if (!drive->keep_settings) {
 990                 if (!drive->using_dma) {
 991                         drive->unmask = 0;
 992                         drive->io_32bit = 0;
 993                 }
 994                 return;
 995         }
 996
 997         if (HWIF(drive)->pre_reset != NULL)
 998                 HWIF(drive)->pre_reset(drive);
 999
1000         if (drive->current_speed != 0xff)
1001                 drive->desired_speed = drive->current_speed;
1002         drive->current_speed = 0xff;
1003 }
1004
1005 /*
1006  * do_reset1() attempts to recover a confused drive by resetting it.
1007  * Unfortunately, resetting a disk drive actually resets all devices on
1008  * the same interface, so it can really be thought of as resetting the
1009  * interface rather than resetting the drive.
1010  *
1011  * ATAPI devices have their own reset mechanism which allows them to be
1012  * individually reset without clobbering other devices on the same interface.
1013  *
1014  * Unfortunately, the IDE interface does not generate an interrupt to let
1015  * us know when the reset operation has finished, so we must poll for this.
1016  * Equally poor, though, is the fact that this may a very long time to complete,
1017  * (up to 30 seconds worstcase).  So, instead of busy-waiting here for it,
1018  * we set a timer to poll at 50ms intervals.
1019  */
1020 static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
1021 {
1022         unsigned int unit;
1023         unsigned long flags;
1024         ide_hwif_t *hwif;
1025         ide_hwgroup_t *hwgroup;
1026         u8 ctl;
1027
1028         spin_lock_irqsave(&ide_lock, flags);
1029         hwif = HWIF(drive);
1030         hwgroup = HWGROUP(drive);
1031
1032         /* We must not reset with running handlers */
1033         BUG_ON(hwgroup->handler != NULL);
1034
1035         /* For an ATAPI device, first try an ATAPI SRST. */
1036         if (drive->media != ide_disk && !do_not_try_atapi) {
1037                 hwgroup->resetting = 1;
1038                 pre_reset(drive);
1039                 SELECT_DRIVE(drive);
1040                 udelay (20);
1041                 hwif->OUTBSYNC(drive, WIN_SRST,
1042                                hwif->io_ports[IDE_COMMAND_OFFSET]);
1043                 ndelay(400);
1044                 hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1045                 hwgroup->polling = 1;
1046                 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL);
1047                 spin_unlock_irqrestore(&ide_lock, flags);
1048                 return ide_started;
1049         }
1050
1051         /*
1052          * First, reset any device state data we were maintaining
1053          * for any of the drives on this interface.
1054          */
1055         for (unit = 0; unit < MAX_DRIVES; ++unit)
1056                 pre_reset(&hwif->drives[unit]);
1057
1058         if (hwif->io_ports[IDE_CONTROL_OFFSET] == 0) {
1059                 spin_unlock_irqrestore(&ide_lock, flags);
1060                 return ide_stopped;
1061         }
1062
1063         hwgroup->resetting = 1;
1064         /*
1065          * Note that we also set nIEN while resetting the device,
1066          * to mask unwanted interrupts from the interface during the reset.
1067          * However, due to the design of PC hardware, this will cause an
1068          * immediate interrupt due to the edge transition it produces.
1069          * This single interrupt gives us a "fast poll" for drives that
1070          * recover from reset very quickly, saving us the first 50ms wait time.
1071          */
1072         /* set SRST and nIEN */
1073         hwif->OUTBSYNC(drive, drive->ctl|6, hwif->io_ports[IDE_CONTROL_OFFSET]);
1074         /* more than enough time */
1075         udelay(10);
1076         if (drive->quirk_list == 2)
1077                 ctl = drive->ctl;       /* clear SRST and nIEN */
1078         else
1079                 ctl = drive->ctl | 2;   /* clear SRST, leave nIEN */
1080         hwif->OUTBSYNC(drive, ctl, hwif->io_ports[IDE_CONTROL_OFFSET]);
1081         /* more than enough time */
1082         udelay(10);
1083         hwgroup->poll_timeout = jiffies + WAIT_WORSTCASE;
1084         hwgroup->polling = 1;
1085         __ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL);
1086
1087         /*
1088          * Some weird controller like resetting themselves to a strange
1089          * state when the disks are reset this way. At least, the Winbond
1090          * 553 documentation says that
1091          */
1092         if (hwif->resetproc)
1093                 hwif->resetproc(drive);
1094
1095         spin_unlock_irqrestore(&ide_lock, flags);
1096         return ide_started;
1097 }
1098
1099 /*
1100  * ide_do_reset() is the entry point to the drive/interface reset code.
1101  */
1102
1103 ide_startstop_t ide_do_reset (ide_drive_t *drive)
1104 {
1105         return do_reset1(drive, 0);
1106 }
1107
1108 EXPORT_SYMBOL(ide_do_reset);
1109
1110 /*
1111  * ide_wait_not_busy() waits for the currently selected device on the hwif
1112  * to report a non-busy status, see comments in ide_probe_port().
1113  */
1114 int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout)
1115 {
1116         u8 stat = 0;
1117
1118         while(timeout--) {
1119                 /*
1120                  * Turn this into a schedule() sleep once I'm sure
1121                  * about locking issues (2.5 work ?).
1122                  */
1123                 mdelay(1);
1124                 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
1125                 if ((stat & BUSY_STAT) == 0)
1126                         return 0;
1127                 /*
1128                  * Assume a value of 0xff means nothing is connected to
1129                  * the interface and it doesn't implement the pull-down
1130                  * resistor on D7.
1131                  */
1132                 if (stat == 0xff)
1133                         return -ENODEV;
1134                 touch_softlockup_watchdog();
1135                 touch_nmi_watchdog();
1136         }
1137         return -EBUSY;
1138 }
1139
1140 EXPORT_SYMBOL_GPL(ide_wait_not_busy);
1141