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