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