drivers/ide/ide-probe.c

   1 /*
   2  *  Copyright (C) 1994-1998   Linus Torvalds & authors (see below)
   3  *  Copyright (C) 2005, 2007  Bartlomiej Zolnierkiewicz
   4  */
   5
   6 /*
   7  *  Mostly written by Mark Lord <mlord@pobox.com>
   8  *                and Gadi Oxman <gadio@netvision.net.il>
   9  *                and Andre Hedrick <andre@linux-ide.org>
  10  *
  11  *  See linux/MAINTAINERS for address of current maintainer.
  12  *
  13  * This is the IDE probe module, as evolved from hd.c and ide.c.
  14  *
  15  * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
  16  *       by Andrea Arcangeli
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/types.h>
  21 #include <linux/string.h>
  22 #include <linux/kernel.h>
  23 #include <linux/timer.h>
  24 #include <linux/mm.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/major.h>
  27 #include <linux/errno.h>
  28 #include <linux/genhd.h>
  29 #include <linux/slab.h>
  30 #include <linux/delay.h>
  31 #include <linux/ide.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/kmod.h>
  34 #include <linux/pci.h>
  35 #include <linux/scatterlist.h>
  36
  37 #include <asm/byteorder.h>
  38 #include <asm/irq.h>
  39 #include <asm/uaccess.h>
  40 #include <asm/io.h>
  41
  42 /**
  43  *      generic_id              -       add a generic drive id
  44  *      @drive: drive to make an ID block for
  45  *
  46  *      Add a fake id field to the drive we are passed. This allows
  47  *      use to skip a ton of NULL checks (which people always miss)
  48  *      and make drive properties unconditional outside of this file
  49  */
  50
  51 static void generic_id(ide_drive_t *drive)
  52 {
  53         u16 *id = drive->id;
  54
  55         id[ATA_ID_CUR_CYLS]     = id[ATA_ID_CYLS]       = drive->cyl;
  56         id[ATA_ID_CUR_HEADS]    = id[ATA_ID_HEADS]      = drive->head;
  57         id[ATA_ID_CUR_SECTORS]  = id[ATA_ID_SECTORS]    = drive->sect;
  58 }
  59
  60 static void ide_disk_init_chs(ide_drive_t *drive)
  61 {
  62         u16 *id = drive->id;
  63
  64         /* Extract geometry if we did not already have one for the drive */
  65         if (!drive->cyl || !drive->head || !drive->sect) {
  66                 drive->cyl  = drive->bios_cyl  = id[ATA_ID_CYLS];
  67                 drive->head = drive->bios_head = id[ATA_ID_HEADS];
  68                 drive->sect = drive->bios_sect = id[ATA_ID_SECTORS];
  69         }
  70
  71         /* Handle logical geometry translation by the drive */
  72         if (ata_id_current_chs_valid(id)) {
  73                 drive->cyl  = id[ATA_ID_CUR_CYLS];
  74                 drive->head = id[ATA_ID_CUR_HEADS];
  75                 drive->sect = id[ATA_ID_CUR_SECTORS];
  76         }
  77
  78         /* Use physical geometry if what we have still makes no sense */
  79         if (drive->head > 16 && id[ATA_ID_HEADS] && id[ATA_ID_HEADS] <= 16) {
  80                 drive->cyl  = id[ATA_ID_CYLS];
  81                 drive->head = id[ATA_ID_HEADS];
  82                 drive->sect = id[ATA_ID_SECTORS];
  83         }
  84 }
  85
  86 static void ide_disk_init_mult_count(ide_drive_t *drive)
  87 {
  88         u16 *id = drive->id;
  89         u8 max_multsect = id[ATA_ID_MAX_MULTSECT] & 0xff;
  90
  91         if (max_multsect) {
  92                 if ((max_multsect / 2) > 1)
  93                         id[ATA_ID_MULTSECT] = max_multsect | 0x100;
  94                 else
  95                         id[ATA_ID_MULTSECT] &= ~0x1ff;
  96
  97                 drive->mult_req = id[ATA_ID_MULTSECT] & 0xff;
  98
  99                 if (drive->mult_req)
 100                         drive->special.b.set_multmode = 1;
 101         }
 102 }
 103
 104 /**
 105  *      do_identify     -       identify a drive
 106  *      @drive: drive to identify
 107  *      @cmd: command used
 108  *
 109  *      Called when we have issued a drive identify command to
 110  *      read and parse the results. This function is run with
 111  *      interrupts disabled.
 112  */
 113
 114 static inline void do_identify (ide_drive_t *drive, u8 cmd)
 115 {
 116         ide_hwif_t *hwif = HWIF(drive);
 117         u16 *id = drive->id;
 118         char *m = (char *)&id[ATA_ID_PROD];
 119         int bswap = 1, is_cfa;
 120
 121         /* read 512 bytes of id info */
 122         hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
 123
 124         drive->dev_flags |= IDE_DFLAG_ID_READ;
 125
 126         local_irq_enable();
 127 #ifdef DEBUG
 128         printk(KERN_INFO "%s: dumping identify data\n", drive->name);
 129         ide_dump_identify((u8 *)id);
 130 #endif
 131         ide_fix_driveid(id);
 132
 133         /*
 134          *  ATA_CMD_ID_ATA returns little-endian info,
 135          *  ATA_CMD_ID_ATAPI *usually* returns little-endian info.
 136          */
 137         if (cmd == ATA_CMD_ID_ATAPI) {
 138                 if ((m[0] == 'N' && m[1] == 'E') ||  /* NEC */
 139                     (m[0] == 'F' && m[1] == 'X') ||  /* Mitsumi */
 140                     (m[0] == 'P' && m[1] == 'i'))    /* Pioneer */
 141                         /* Vertos drives may still be weird */
 142                         bswap ^= 1;
 143         }
 144
 145         ide_fixstring(m, ATA_ID_PROD_LEN, bswap);
 146         ide_fixstring((char *)&id[ATA_ID_FW_REV], ATA_ID_FW_REV_LEN, bswap);
 147         ide_fixstring((char *)&id[ATA_ID_SERNO], ATA_ID_SERNO_LEN, bswap);
 148
 149         /* we depend on this a lot! */
 150         m[ATA_ID_PROD_LEN - 1] = '\0';
 151
 152         if (strstr(m, "E X A B Y T E N E S T"))
 153                 goto err_misc;
 154
 155         printk(KERN_INFO "%s: %s, ", drive->name, m);
 156
 157         drive->dev_flags |= IDE_DFLAG_PRESENT;
 158         drive->dev_flags &= ~IDE_DFLAG_DEAD;
 159
 160         /*
 161          * Check for an ATAPI device
 162          */
 163         if (cmd == ATA_CMD_ID_ATAPI) {
 164                 u8 type = (id[ATA_ID_CONFIG] >> 8) & 0x1f;
 165
 166                 printk(KERN_CONT "ATAPI ");
 167                 switch (type) {
 168                         case ide_floppy:
 169                                 if (!strstr(m, "CD-ROM")) {
 170                                         if (!strstr(m, "oppy") &&
 171                                             !strstr(m, "poyp") &&
 172                                             !strstr(m, "ZIP"))
 173                                                 printk(KERN_CONT "cdrom or floppy?, assuming ");
 174                                         if (drive->media != ide_cdrom) {
 175                                                 printk(KERN_CONT "FLOPPY");
 176                                                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 177                                                 break;
 178                                         }
 179                                 }
 180                                 /* Early cdrom models used zero */
 181                                 type = ide_cdrom;
 182                         case ide_cdrom:
 183                                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 184 #ifdef CONFIG_PPC
 185                                 /* kludge for Apple PowerBook internal zip */
 186                                 if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) {
 187                                         printk(KERN_CONT "FLOPPY");
 188                                         type = ide_floppy;
 189                                         break;
 190                                 }
 191 #endif
 192                                 printk(KERN_CONT "CD/DVD-ROM");
 193                                 break;
 194                         case ide_tape:
 195                                 printk(KERN_CONT "TAPE");
 196                                 break;
 197                         case ide_optical:
 198                                 printk(KERN_CONT "OPTICAL");
 199                                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 200                                 break;
 201                         default:
 202                                 printk(KERN_CONT "UNKNOWN (type %d)", type);
 203                                 break;
 204                 }
 205                 printk(KERN_CONT " drive\n");
 206                 drive->media = type;
 207                 /* an ATAPI device ignores DRDY */
 208                 drive->ready_stat = 0;
 209                 return;
 210         }
 211
 212         /*
 213          * Not an ATAPI device: looks like a "regular" hard disk
 214          */
 215
 216         is_cfa = ata_id_is_cfa(id);
 217
 218         /* CF devices are *not* removable in Linux definition of the term */
 219         if (is_cfa == 0 && (id[ATA_ID_CONFIG] & (1 << 7)))
 220                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 221
 222         drive->media = ide_disk;
 223
 224         printk(KERN_CONT "%s DISK drive\n", is_cfa ? "CFA" : "ATA");
 225
 226         return;
 227
 228 err_misc:
 229         kfree(id);
 230         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 231         return;
 232 }
 233
 234 /**
 235  *      actual_try_to_identify  -       send ata/atapi identify
 236  *      @drive: drive to identify
 237  *      @cmd: command to use
 238  *
 239  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 240  *      and waits for a response.  It also monitors irqs while this is
 241  *      happening, in hope of automatically determining which one is
 242  *      being used by the interface.
 243  *
 244  *      Returns:        0  device was identified
 245  *                      1  device timed-out (no response to identify request)
 246  *                      2  device aborted the command (refused to identify itself)
 247  */
 248
 249 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 250 {
 251         ide_hwif_t *hwif = HWIF(drive);
 252         struct ide_io_ports *io_ports = &hwif->io_ports;
 253         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 254         int use_altstatus = 0, rc;
 255         unsigned long timeout;
 256         u8 s = 0, a = 0;
 257
 258         /* take a deep breath */
 259         msleep(50);
 260
 261         if (io_ports->ctl_addr) {
 262                 a = tp_ops->read_altstatus(hwif);
 263                 s = tp_ops->read_status(hwif);
 264                 if ((a ^ s) & ~ATA_IDX)
 265                         /* ancient Seagate drives, broken interfaces */
 266                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
 267                                          "instead of ALTSTATUS(0x%02x)\n",
 268                                          drive->name, s, a);
 269                 else
 270                         /* use non-intrusive polling */
 271                         use_altstatus = 1;
 272         }
 273
 274         /* set features register for atapi
 275          * identify command to be sure of reply
 276          */
 277         if (cmd == ATA_CMD_ID_ATAPI) {
 278                 ide_task_t task;
 279
 280                 memset(&task, 0, sizeof(task));
 281                 /* disable DMA & overlap */
 282                 task.tf_flags = IDE_TFLAG_OUT_FEATURE;
 283
 284                 tp_ops->tf_load(drive, &task);
 285         }
 286
 287         /* ask drive for ID */
 288         tp_ops->exec_command(hwif, cmd);
 289
 290         timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 291
 292         if (ide_busy_sleep(hwif, timeout, use_altstatus))
 293                 return 1;
 294
 295         /* wait for IRQ and ATA_DRQ */
 296         msleep(50);
 297         s = tp_ops->read_status(hwif);
 298
 299         if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
 300                 unsigned long flags;
 301
 302                 /* local CPU only; some systems need this */
 303                 local_irq_save(flags);
 304                 /* drive returned ID */
 305                 do_identify(drive, cmd);
 306                 /* drive responded with ID */
 307                 rc = 0;
 308                 /* clear drive IRQ */
 309                 (void)tp_ops->read_status(hwif);
 310                 local_irq_restore(flags);
 311         } else {
 312                 /* drive refused ID */
 313                 rc = 2;
 314         }
 315         return rc;
 316 }
 317
 318 /**
 319  *      try_to_identify -       try to identify a drive
 320  *      @drive: drive to probe
 321  *      @cmd: command to use
 322  *
 323  *      Issue the identify command and then do IRQ probing to
 324  *      complete the identification when needed by finding the
 325  *      IRQ the drive is attached to
 326  */
 327
 328 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 329 {
 330         ide_hwif_t *hwif = HWIF(drive);
 331         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 332         int retval;
 333         int autoprobe = 0;
 334         unsigned long cookie = 0;
 335
 336         /*
 337          * Disable device irq unless we need to
 338          * probe for it. Otherwise we'll get spurious
 339          * interrupts during the identify-phase that
 340          * the irq handler isn't expecting.
 341          */
 342         if (hwif->io_ports.ctl_addr) {
 343                 if (!hwif->irq) {
 344                         autoprobe = 1;
 345                         cookie = probe_irq_on();
 346                 }
 347                 tp_ops->set_irq(hwif, autoprobe);
 348         }
 349
 350         retval = actual_try_to_identify(drive, cmd);
 351
 352         if (autoprobe) {
 353                 int irq;
 354
 355                 tp_ops->set_irq(hwif, 0);
 356                 /* clear drive IRQ */
 357                 (void)tp_ops->read_status(hwif);
 358                 udelay(5);
 359                 irq = probe_irq_off(cookie);
 360                 if (!hwif->irq) {
 361                         if (irq > 0) {
 362                                 hwif->irq = irq;
 363                         } else {
 364                                 /* Mmmm.. multiple IRQs..
 365                                  * don't know which was ours
 366                                  */
 367                                 printk(KERN_ERR "%s: IRQ probe failed (0x%lx)\n",
 368                                         drive->name, cookie);
 369                         }
 370                 }
 371         }
 372         return retval;
 373 }
 374
 375 int ide_busy_sleep(ide_hwif_t *hwif, unsigned long timeout, int altstatus)
 376 {
 377         u8 stat;
 378
 379         timeout += jiffies;
 380
 381         do {
 382                 msleep(50);     /* give drive a breather */
 383                 stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
 384                                  : hwif->tp_ops->read_status(hwif);
 385                 if ((stat & ATA_BUSY) == 0)
 386                         return 0;
 387         } while (time_before(jiffies, timeout));
 388
 389         return 1;       /* drive timed-out */
 390 }
 391
 392 static u8 ide_read_device(ide_drive_t *drive)
 393 {
 394         ide_task_t task;
 395
 396         memset(&task, 0, sizeof(task));
 397         task.tf_flags = IDE_TFLAG_IN_DEVICE;
 398
 399         drive->hwif->tp_ops->tf_read(drive, &task);
 400
 401         return task.tf.device;
 402 }
 403
 404 /**
 405  *      do_probe                -       probe an IDE device
 406  *      @drive: drive to probe
 407  *      @cmd: command to use
 408  *
 409  *      do_probe() has the difficult job of finding a drive if it exists,
 410  *      without getting hung up if it doesn't exist, without trampling on
 411  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 412  *
 413  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 414  *      but does not respond right away, the probe will "hang in there"
 415  *      for the maximum wait time (about 30 seconds), otherwise it will
 416  *      exit much more quickly.
 417  *
 418  * Returns:     0  device was identified
 419  *              1  device timed-out (no response to identify request)
 420  *              2  device aborted the command (refused to identify itself)
 421  *              3  bad status from device (possible for ATAPI drives)
 422  *              4  probe was not attempted because failure was obvious
 423  */
 424
 425 static int do_probe (ide_drive_t *drive, u8 cmd)
 426 {
 427         ide_hwif_t *hwif = HWIF(drive);
 428         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 429         int rc;
 430         u8 present = !!(drive->dev_flags & IDE_DFLAG_PRESENT), stat;
 431
 432         /* avoid waiting for inappropriate probes */
 433         if (present && drive->media != ide_disk && cmd == ATA_CMD_ID_ATA)
 434                 return 4;
 435
 436 #ifdef DEBUG
 437         printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
 438                 drive->name, present, drive->media,
 439                 (cmd == ATA_CMD_ID_ATA) ? "ATA" : "ATAPI");
 440 #endif
 441
 442         /* needed for some systems
 443          * (e.g. crw9624 as drive0 with disk as slave)
 444          */
 445         msleep(50);
 446         SELECT_DRIVE(drive);
 447         msleep(50);
 448
 449         if (ide_read_device(drive) != drive->select.all && present == 0) {
 450                 if (drive->select.b.unit != 0) {
 451                         /* exit with drive0 selected */
 452                         SELECT_DRIVE(&hwif->drives[0]);
 453                         /* allow ATA_BUSY to assert & clear */
 454                         msleep(50);
 455                 }
 456                 /* no i/f present: mmm.. this should be a 4 -ml */
 457                 return 3;
 458         }
 459
 460         stat = tp_ops->read_status(hwif);
 461
 462         if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) ||
 463             present || cmd == ATA_CMD_ID_ATAPI) {
 464                 /* send cmd and wait */
 465                 if ((rc = try_to_identify(drive, cmd))) {
 466                         /* failed: try again */
 467                         rc = try_to_identify(drive,cmd);
 468                 }
 469
 470                 stat = tp_ops->read_status(hwif);
 471
 472                 if (stat == (ATA_BUSY | ATA_DRDY))
 473                         return 4;
 474
 475                 if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) {
 476                         printk(KERN_ERR "%s: no response (status = 0x%02x), "
 477                                         "resetting drive\n", drive->name, stat);
 478                         msleep(50);
 479                         SELECT_DRIVE(drive);
 480                         msleep(50);
 481                         tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
 482                         (void)ide_busy_sleep(hwif, WAIT_WORSTCASE, 0);
 483                         rc = try_to_identify(drive, cmd);
 484                 }
 485
 486                 /* ensure drive IRQ is clear */
 487                 stat = tp_ops->read_status(hwif);
 488
 489                 if (rc == 1)
 490                         printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
 491                                         drive->name, stat);
 492         } else {
 493                 /* not present or maybe ATAPI */
 494                 rc = 3;
 495         }
 496         if (drive->select.b.unit != 0) {
 497                 /* exit with drive0 selected */
 498                 SELECT_DRIVE(&hwif->drives[0]);
 499                 msleep(50);
 500                 /* ensure drive irq is clear */
 501                 (void)tp_ops->read_status(hwif);
 502         }
 503         return rc;
 504 }
 505
 506 /*
 507  *
 508  */
 509 static void enable_nest (ide_drive_t *drive)
 510 {
 511         ide_hwif_t *hwif = HWIF(drive);
 512         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 513         u8 stat;
 514
 515         printk(KERN_INFO "%s: enabling %s -- ",
 516                 hwif->name, (char *)&drive->id[ATA_ID_PROD]);
 517
 518         SELECT_DRIVE(drive);
 519         msleep(50);
 520         tp_ops->exec_command(hwif, ATA_EXABYTE_ENABLE_NEST);
 521
 522         if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 0)) {
 523                 printk(KERN_CONT "failed (timeout)\n");
 524                 return;
 525         }
 526
 527         msleep(50);
 528
 529         stat = tp_ops->read_status(hwif);
 530
 531         if (!OK_STAT(stat, 0, BAD_STAT))
 532                 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
 533         else
 534                 printk(KERN_CONT "success\n");
 535 }
 536
 537 /**
 538  *      probe_for_drives        -       upper level drive probe
 539  *      @drive: drive to probe for
 540  *
 541  *      probe_for_drive() tests for existence of a given drive using do_probe()
 542  *      and presents things to the user as needed.
 543  *
 544  *      Returns:        0  no device was found
 545  *                      1  device was found
 546  *                         (note: IDE_DFLAG_PRESENT might still be not set)
 547  */
 548
 549 static inline u8 probe_for_drive (ide_drive_t *drive)
 550 {
 551         char *m;
 552
 553         /*
 554          *      In order to keep things simple we have an id
 555          *      block for all drives at all times. If the device
 556          *      is pre ATA or refuses ATA/ATAPI identify we
 557          *      will add faked data to this.
 558          *
 559          *      Also note that 0 everywhere means "can't do X"
 560          */
 561
 562         drive->dev_flags &= ~IDE_DFLAG_ID_READ;
 563
 564         drive->id = kzalloc(SECTOR_SIZE, GFP_KERNEL);
 565         if (drive->id == NULL) {
 566                 printk(KERN_ERR "ide: out of memory for id data.\n");
 567                 return 0;
 568         }
 569
 570         m = (char *)&drive->id[ATA_ID_PROD];
 571         strcpy(m, "UNKNOWN");
 572
 573         /* skip probing? */
 574         if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0) {
 575 retry:
 576                 /* if !(success||timed-out) */
 577                 if (do_probe(drive, ATA_CMD_ID_ATA) >= 2)
 578                         /* look for ATAPI device */
 579                         (void)do_probe(drive, ATA_CMD_ID_ATAPI);
 580
 581                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 582                         /* drive not found */
 583                         return 0;
 584
 585                 if (strstr(m, "E X A B Y T E N E S T")) {
 586                         enable_nest(drive);
 587                         goto retry;
 588                 }
 589
 590                 /* identification failed? */
 591                 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
 592                         if (drive->media == ide_disk) {
 593                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 594                                         drive->name, drive->cyl,
 595                                         drive->head, drive->sect);
 596                         } else if (drive->media == ide_cdrom) {
 597                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 598                         } else {
 599                                 /* nuke it */
 600                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 601                                 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 602                         }
 603                 }
 604                 /* drive was found */
 605         }
 606
 607         if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 608                 return 0;
 609
 610         /* The drive wasn't being helpful. Add generic info only */
 611         if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
 612                 generic_id(drive);
 613                 return 1;
 614         }
 615
 616         if (drive->media == ide_disk) {
 617                 ide_disk_init_chs(drive);
 618                 ide_disk_init_mult_count(drive);
 619         }
 620
 621         return !!(drive->dev_flags & IDE_DFLAG_PRESENT);
 622 }
 623
 624 static void hwif_release_dev(struct device *dev)
 625 {
 626         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 627
 628         complete(&hwif->gendev_rel_comp);
 629 }
 630
 631 static int ide_register_port(ide_hwif_t *hwif)
 632 {
 633         int ret;
 634
 635         /* register with global device tree */
 636         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 637         hwif->gendev.driver_data = hwif;
 638         if (hwif->gendev.parent == NULL) {
 639                 if (hwif->dev)
 640                         hwif->gendev.parent = hwif->dev;
 641                 else
 642                         /* Would like to do = &device_legacy */
 643                         hwif->gendev.parent = NULL;
 644         }
 645         hwif->gendev.release = hwif_release_dev;
 646         ret = device_register(&hwif->gendev);
 647         if (ret < 0) {
 648                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
 649                         __func__, ret);
 650                 goto out;
 651         }
 652
 653         hwif->portdev = device_create_drvdata(ide_port_class, &hwif->gendev,
 654                                               MKDEV(0, 0), hwif, hwif->name);
 655         if (IS_ERR(hwif->portdev)) {
 656                 ret = PTR_ERR(hwif->portdev);
 657                 device_unregister(&hwif->gendev);
 658         }
 659 out:
 660         return ret;
 661 }
 662
 663 /**
 664  *      ide_port_wait_ready     -       wait for port to become ready
 665  *      @hwif: IDE port
 666  *
 667  *      This is needed on some PPCs and a bunch of BIOS-less embedded
 668  *      platforms.  Typical cases are:
 669  *
 670  *      - The firmware hard reset the disk before booting the kernel,
 671  *        the drive is still doing it's poweron-reset sequence, that
 672  *        can take up to 30 seconds.
 673  *
 674  *      - The firmware does nothing (or no firmware), the device is
 675  *        still in POST state (same as above actually).
 676  *
 677  *      - Some CD/DVD/Writer combo drives tend to drive the bus during
 678  *        their reset sequence even when they are non-selected slave
 679  *        devices, thus preventing discovery of the main HD.
 680  *
 681  *      Doing this wait-for-non-busy should not harm any existing
 682  *      configuration and fix some issues like the above.
 683  *
 684  *      BenH.
 685  *
 686  *      Returns 0 on success, error code (< 0) otherwise.
 687  */
 688
 689 static int ide_port_wait_ready(ide_hwif_t *hwif)
 690 {
 691         int unit, rc;
 692
 693         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 694
 695         /* Let HW settle down a bit from whatever init state we
 696          * come from */
 697         mdelay(2);
 698
 699         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 700          * I know of at least one disk who takes 31 seconds, I use 35
 701          * here to be safe
 702          */
 703         rc = ide_wait_not_busy(hwif, 35000);
 704         if (rc)
 705                 return rc;
 706
 707         /* Now make sure both master & slave are ready */
 708         for (unit = 0; unit < MAX_DRIVES; unit++) {
 709                 ide_drive_t *drive = &hwif->drives[unit];
 710
 711                 /* Ignore disks that we will not probe for later. */
 712                 if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0 ||
 713                     (drive->dev_flags & IDE_DFLAG_PRESENT)) {
 714                         SELECT_DRIVE(drive);
 715                         hwif->tp_ops->set_irq(hwif, 1);
 716                         mdelay(2);
 717                         rc = ide_wait_not_busy(hwif, 35000);
 718                         if (rc)
 719                                 goto out;
 720                 } else
 721                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
 722                                           drive->name);
 723         }
 724 out:
 725         /* Exit function with master reselected (let's be sane) */
 726         if (unit)
 727                 SELECT_DRIVE(&hwif->drives[0]);
 728
 729         return rc;
 730 }
 731
 732 /**
 733  *      ide_undecoded_slave     -       look for bad CF adapters
 734  *      @dev1: slave device
 735  *
 736  *      Analyse the drives on the interface and attempt to decide if we
 737  *      have the same drive viewed twice. This occurs with crap CF adapters
 738  *      and PCMCIA sometimes.
 739  */
 740
 741 void ide_undecoded_slave(ide_drive_t *dev1)
 742 {
 743         ide_drive_t *dev0 = &dev1->hwif->drives[0];
 744
 745         if ((dev1->dn & 1) == 0 || (dev0->dev_flags & IDE_DFLAG_PRESENT) == 0)
 746                 return;
 747
 748         /* If the models don't match they are not the same product */
 749         if (strcmp((char *)&dev0->id[ATA_ID_PROD],
 750                    (char *)&dev1->id[ATA_ID_PROD]))
 751                 return;
 752
 753         /* Serial numbers do not match */
 754         if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
 755                     (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
 756                 return;
 757
 758         /* No serial number, thankfully very rare for CF */
 759         if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
 760                 return;
 761
 762         /* Appears to be an IDE flash adapter with decode bugs */
 763         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 764
 765         dev1->dev_flags &= ~IDE_DFLAG_PRESENT;
 766 }
 767
 768 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 769
 770 static int ide_probe_port(ide_hwif_t *hwif)
 771 {
 772         unsigned long flags;
 773         unsigned int irqd;
 774         int unit, rc = -ENODEV;
 775
 776         BUG_ON(hwif->present);
 777
 778         if ((hwif->drives[0].dev_flags & IDE_DFLAG_NOPROBE) &&
 779             (hwif->drives[1].dev_flags & IDE_DFLAG_NOPROBE))
 780                 return -EACCES;
 781
 782         /*
 783          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 784          * we'll install our IRQ driver much later...
 785          */
 786         irqd = hwif->irq;
 787         if (irqd)
 788                 disable_irq(hwif->irq);
 789
 790         local_irq_set(flags);
 791
 792         if (ide_port_wait_ready(hwif) == -EBUSY)
 793                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 794
 795         /*
 796          * Second drive should only exist if first drive was found,
 797          * but a lot of cdrom drives are configured as single slaves.
 798          */
 799         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 800                 ide_drive_t *drive = &hwif->drives[unit];
 801                 drive->dn = (hwif->channel ? 2 : 0) + unit;
 802                 (void) probe_for_drive(drive);
 803                 if (drive->dev_flags & IDE_DFLAG_PRESENT)
 804                         rc = 0;
 805         }
 806
 807         local_irq_restore(flags);
 808
 809         /*
 810          * Use cached IRQ number. It might be (and is...) changed by probe
 811          * code above
 812          */
 813         if (irqd)
 814                 enable_irq(irqd);
 815
 816         return rc;
 817 }
 818
 819 static void ide_port_tune_devices(ide_hwif_t *hwif)
 820 {
 821         const struct ide_port_ops *port_ops = hwif->port_ops;
 822         int unit;
 823
 824         for (unit = 0; unit < MAX_DRIVES; unit++) {
 825                 ide_drive_t *drive = &hwif->drives[unit];
 826
 827                 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
 828                         if (port_ops && port_ops->quirkproc)
 829                                 port_ops->quirkproc(drive);
 830                 }
 831         }
 832
 833         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 834                 ide_drive_t *drive = &hwif->drives[unit];
 835
 836                 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
 837                         ide_set_max_pio(drive);
 838
 839                         drive->dev_flags |= IDE_DFLAG_NICE1;
 840
 841                         if (hwif->dma_ops)
 842                                 ide_set_dma(drive);
 843                 }
 844         }
 845
 846         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 847                 ide_drive_t *drive = &hwif->drives[unit];
 848
 849                 if ((hwif->host_flags & IDE_HFLAG_NO_IO_32BIT) ||
 850                     drive->id[ATA_ID_DWORD_IO])
 851                         drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
 852                 else
 853                         drive->dev_flags &= ~IDE_DFLAG_NO_IO_32BIT;
 854         }
 855 }
 856
 857 /*
 858  * save_match() is used to simplify logic in init_irq() below.
 859  *
 860  * A loophole here is that we may not know about a particular
 861  * hwif's irq until after that hwif is actually probed/initialized..
 862  * This could be a problem for the case where an hwif is on a
 863  * dual interface that requires serialization (eg. cmd640) and another
 864  * hwif using one of the same irqs is initialized beforehand.
 865  *
 866  * This routine detects and reports such situations, but does not fix them.
 867  */
 868 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 869 {
 870         ide_hwif_t *m = *match;
 871
 872         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 873                 if (!new->hwgroup)
 874                         return;
 875                 printk(KERN_WARNING "%s: potential IRQ problem with %s and %s\n",
 876                         hwif->name, new->name, m->name);
 877         }
 878         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 879                 *match = new;
 880 }
 881
 882 /*
 883  * init request queue
 884  */
 885 static int ide_init_queue(ide_drive_t *drive)
 886 {
 887         struct request_queue *q;
 888         ide_hwif_t *hwif = HWIF(drive);
 889         int max_sectors = 256;
 890         int max_sg_entries = PRD_ENTRIES;
 891
 892         /*
 893          *      Our default set up assumes the normal IDE case,
 894          *      that is 64K segmenting, standard PRD setup
 895          *      and LBA28. Some drivers then impose their own
 896          *      limits and LBA48 we could raise it but as yet
 897          *      do not.
 898          */
 899
 900         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
 901         if (!q)
 902                 return 1;
 903
 904         q->queuedata = drive;
 905         blk_queue_segment_boundary(q, 0xffff);
 906
 907         if (hwif->rqsize < max_sectors)
 908                 max_sectors = hwif->rqsize;
 909         blk_queue_max_sectors(q, max_sectors);
 910
 911 #ifdef CONFIG_PCI
 912         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 913          * creates segments that don't completely match our boundary
 914          * requirements and thus need to be broken up again. Because it
 915          * doesn't align properly either, we may actually have to break up
 916          * to more segments than what was we got in the first place, a max
 917          * worst case is twice as many.
 918          * This will be fixed once we teach pci_map_sg() about our boundary
 919          * requirements, hopefully soon. *FIXME*
 920          */
 921         if (!PCI_DMA_BUS_IS_PHYS)
 922                 max_sg_entries >>= 1;
 923 #endif /* CONFIG_PCI */
 924
 925         blk_queue_max_hw_segments(q, max_sg_entries);
 926         blk_queue_max_phys_segments(q, max_sg_entries);
 927
 928         /* assign drive queue */
 929         drive->queue = q;
 930
 931         /* needs drive->queue to be set */
 932         ide_toggle_bounce(drive, 1);
 933
 934         return 0;
 935 }
 936
 937 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
 938 {
 939         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
 940
 941         spin_lock_irq(&ide_lock);
 942         if (!hwgroup->drive) {
 943                 /* first drive for hwgroup. */
 944                 drive->next = drive;
 945                 hwgroup->drive = drive;
 946                 hwgroup->hwif = HWIF(hwgroup->drive);
 947         } else {
 948                 drive->next = hwgroup->drive->next;
 949                 hwgroup->drive->next = drive;
 950         }
 951         spin_unlock_irq(&ide_lock);
 952 }
 953
 954 /*
 955  * For any present drive:
 956  * - allocate the block device queue
 957  * - link drive into the hwgroup
 958  */
 959 static void ide_port_setup_devices(ide_hwif_t *hwif)
 960 {
 961         int i;
 962
 963         mutex_lock(&ide_cfg_mtx);
 964         for (i = 0; i < MAX_DRIVES; i++) {
 965                 ide_drive_t *drive = &hwif->drives[i];
 966
 967                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 968                         continue;
 969
 970                 if (ide_init_queue(drive)) {
 971                         printk(KERN_ERR "ide: failed to init %s\n",
 972                                         drive->name);
 973                         continue;
 974                 }
 975
 976                 ide_add_drive_to_hwgroup(drive);
 977         }
 978         mutex_unlock(&ide_cfg_mtx);
 979 }
 980
 981 static ide_hwif_t *ide_ports[MAX_HWIFS];
 982
 983 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
 984 {
 985         ide_hwgroup_t *hwgroup = hwif->hwgroup;
 986
 987         ide_ports[hwif->index] = NULL;
 988
 989         spin_lock_irq(&ide_lock);
 990         /*
 991          * Remove us from the hwgroup, and free
 992          * the hwgroup if we were the only member
 993          */
 994         if (hwif->next == hwif) {
 995                 BUG_ON(hwgroup->hwif != hwif);
 996                 kfree(hwgroup);
 997         } else {
 998                 /* There is another interface in hwgroup.
 999                  * Unlink us, and set hwgroup->drive and ->hwif to
1000                  * something sane.
1001                  */
1002                 ide_hwif_t *g = hwgroup->hwif;
1003
1004                 while (g->next != hwif)
1005                         g = g->next;
1006                 g->next = hwif->next;
1007                 if (hwgroup->hwif == hwif) {
1008                         /* Chose a random hwif for hwgroup->hwif.
1009                          * It's guaranteed that there are no drives
1010                          * left in the hwgroup.
1011                          */
1012                         BUG_ON(hwgroup->drive != NULL);
1013                         hwgroup->hwif = g;
1014                 }
1015                 BUG_ON(hwgroup->hwif == hwif);
1016         }
1017         spin_unlock_irq(&ide_lock);
1018 }
1019
1020 /*
1021  * This routine sets up the irq for an ide interface, and creates a new
1022  * hwgroup for the irq/hwif if none was previously assigned.
1023  *
1024  * Much of the code is for correctly detecting/handling irq sharing
1025  * and irq serialization situations.  This is somewhat complex because
1026  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1027  */
1028 static int init_irq (ide_hwif_t *hwif)
1029 {
1030         struct ide_io_ports *io_ports = &hwif->io_ports;
1031         unsigned int index;
1032         ide_hwgroup_t *hwgroup;
1033         ide_hwif_t *match = NULL;
1034
1035         mutex_lock(&ide_cfg_mtx);
1036         hwif->hwgroup = NULL;
1037
1038         /*
1039          * Group up with any other hwifs that share our irq(s).
1040          */
1041         for (index = 0; index < MAX_HWIFS; index++) {
1042                 ide_hwif_t *h = ide_ports[index];
1043
1044                 if (h && h->hwgroup) {  /* scan only initialized ports */
1045                         if (hwif->irq == h->irq) {
1046                                 hwif->sharing_irq = h->sharing_irq = 1;
1047                                 if (hwif->chipset != ide_pci ||
1048                                     h->chipset != ide_pci) {
1049                                         save_match(hwif, h, &match);
1050                                 }
1051                         }
1052                         if (hwif->serialized) {
1053                                 if (hwif->mate && hwif->mate->irq == h->irq)
1054                                         save_match(hwif, h, &match);
1055                         }
1056                         if (h->serialized) {
1057                                 if (h->mate && hwif->irq == h->mate->irq)
1058                                         save_match(hwif, h, &match);
1059                         }
1060                 }
1061         }
1062
1063         /*
1064          * If we are still without a hwgroup, then form a new one
1065          */
1066         if (match) {
1067                 hwgroup = match->hwgroup;
1068                 hwif->hwgroup = hwgroup;
1069                 /*
1070                  * Link us into the hwgroup.
1071                  * This must be done early, do ensure that unexpected_intr
1072                  * can find the hwif and prevent irq storms.
1073                  * No drives are attached to the new hwif, choose_drive
1074                  * can't do anything stupid (yet).
1075                  * Add ourself as the 2nd entry to the hwgroup->hwif
1076                  * linked list, the first entry is the hwif that owns
1077                  * hwgroup->handler - do not change that.
1078                  */
1079                 spin_lock_irq(&ide_lock);
1080                 hwif->next = hwgroup->hwif->next;
1081                 hwgroup->hwif->next = hwif;
1082                 BUG_ON(hwif->next == hwif);
1083                 spin_unlock_irq(&ide_lock);
1084         } else {
1085                 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1086                                        hwif_to_node(hwif));
1087                 if (hwgroup == NULL)
1088                         goto out_up;
1089
1090                 hwif->hwgroup = hwgroup;
1091                 hwgroup->hwif = hwif->next = hwif;
1092
1093                 init_timer(&hwgroup->timer);
1094                 hwgroup->timer.function = &ide_timer_expiry;
1095                 hwgroup->timer.data = (unsigned long) hwgroup;
1096         }
1097
1098         ide_ports[hwif->index] = hwif;
1099
1100         /*
1101          * Allocate the irq, if not already obtained for another hwif
1102          */
1103         if (!match || match->irq != hwif->irq) {
1104                 int sa = 0;
1105 #if defined(__mc68000__)
1106                 sa = IRQF_SHARED;
1107 #endif /* __mc68000__ */
1108
1109                 if (hwif->chipset == ide_pci || hwif->chipset == ide_cmd646 ||
1110                     hwif->chipset == ide_ali14xx)
1111                         sa = IRQF_SHARED;
1112
1113                 if (io_ports->ctl_addr)
1114                         hwif->tp_ops->set_irq(hwif, 1);
1115
1116                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1117                         goto out_unlink;
1118         }
1119
1120         if (!hwif->rqsize) {
1121                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1122                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1123                         hwif->rqsize = 256;
1124                 else
1125                         hwif->rqsize = 65536;
1126         }
1127
1128 #if !defined(__mc68000__)
1129         printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1130                 io_ports->data_addr, io_ports->status_addr,
1131                 io_ports->ctl_addr, hwif->irq);
1132 #else
1133         printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
1134                 io_ports->data_addr, hwif->irq);
1135 #endif /* __mc68000__ */
1136         if (match)
1137                 printk(KERN_CONT " (%sed with %s)",
1138                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1139         printk(KERN_CONT "\n");
1140
1141         mutex_unlock(&ide_cfg_mtx);
1142         return 0;
1143 out_unlink:
1144         ide_remove_port_from_hwgroup(hwif);
1145 out_up:
1146         mutex_unlock(&ide_cfg_mtx);
1147         return 1;
1148 }
1149
1150 static int ata_lock(dev_t dev, void *data)
1151 {
1152         /* FIXME: we want to pin hwif down */
1153         return 0;
1154 }
1155
1156 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1157 {
1158         ide_hwif_t *hwif = data;
1159         int unit = *part >> PARTN_BITS;
1160         ide_drive_t *drive = &hwif->drives[unit];
1161
1162         if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
1163                 return NULL;
1164
1165         if (drive->media == ide_disk)
1166                 request_module("ide-disk");
1167         if (drive->dev_flags & IDE_DFLAG_SCSI)
1168                 request_module("ide-scsi");
1169         if (drive->media == ide_cdrom || drive->media == ide_optical)
1170                 request_module("ide-cd");
1171         if (drive->media == ide_tape)
1172                 request_module("ide-tape");
1173         if (drive->media == ide_floppy)
1174                 request_module("ide-floppy");
1175
1176         return NULL;
1177 }
1178
1179 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1180 {
1181         struct gendisk *p = data;
1182         *part &= (1 << PARTN_BITS) - 1;
1183         return &disk_to_dev(p)->kobj;
1184 }
1185
1186 static int exact_lock(dev_t dev, void *data)
1187 {
1188         struct gendisk *p = data;
1189
1190         if (!get_disk(p))
1191                 return -1;
1192         return 0;
1193 }
1194
1195 void ide_register_region(struct gendisk *disk)
1196 {
1197         blk_register_region(MKDEV(disk->major, disk->first_minor),
1198                             disk->minors, NULL, exact_match, exact_lock, disk);
1199 }
1200
1201 EXPORT_SYMBOL_GPL(ide_register_region);
1202
1203 void ide_unregister_region(struct gendisk *disk)
1204 {
1205         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1206                               disk->minors);
1207 }
1208
1209 EXPORT_SYMBOL_GPL(ide_unregister_region);
1210
1211 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1212 {
1213         ide_hwif_t *hwif = drive->hwif;
1214         unsigned int unit = (drive->select.all >> 4) & 1;
1215
1216         disk->major = hwif->major;
1217         disk->first_minor = unit << PARTN_BITS;
1218         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1219         disk->queue = drive->queue;
1220 }
1221
1222 EXPORT_SYMBOL_GPL(ide_init_disk);
1223
1224 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1225 {
1226         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1227
1228         if (drive == drive->next) {
1229                 /* special case: last drive from hwgroup. */
1230                 BUG_ON(hwgroup->drive != drive);
1231                 hwgroup->drive = NULL;
1232         } else {
1233                 ide_drive_t *walk;
1234
1235                 walk = hwgroup->drive;
1236                 while (walk->next != drive)
1237                         walk = walk->next;
1238                 walk->next = drive->next;
1239                 if (hwgroup->drive == drive) {
1240                         hwgroup->drive = drive->next;
1241                         hwgroup->hwif = hwgroup->drive->hwif;
1242                 }
1243         }
1244         BUG_ON(hwgroup->drive == drive);
1245 }
1246
1247 static void drive_release_dev (struct device *dev)
1248 {
1249         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1250
1251         ide_proc_unregister_device(drive);
1252
1253         spin_lock_irq(&ide_lock);
1254         ide_remove_drive_from_hwgroup(drive);
1255         kfree(drive->id);
1256         drive->id = NULL;
1257         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
1258         /* Messed up locking ... */
1259         spin_unlock_irq(&ide_lock);
1260         blk_cleanup_queue(drive->queue);
1261         spin_lock_irq(&ide_lock);
1262         drive->queue = NULL;
1263         spin_unlock_irq(&ide_lock);
1264
1265         complete(&drive->gendev_rel_comp);
1266 }
1267
1268 static int hwif_init(ide_hwif_t *hwif)
1269 {
1270         int old_irq;
1271
1272         if (!hwif->irq) {
1273                 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1274                 if (!hwif->irq) {
1275                         printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
1276                         return 0;
1277                 }
1278         }
1279
1280         if (register_blkdev(hwif->major, hwif->name))
1281                 return 0;
1282
1283         if (!hwif->sg_max_nents)
1284                 hwif->sg_max_nents = PRD_ENTRIES;
1285
1286         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1287                                  GFP_KERNEL);
1288         if (!hwif->sg_table) {
1289                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1290                 goto out;
1291         }
1292
1293         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1294
1295         if (init_irq(hwif) == 0)
1296                 goto done;
1297
1298         old_irq = hwif->irq;
1299         /*
1300          *      It failed to initialise. Find the default IRQ for
1301          *      this port and try that.
1302          */
1303         hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1304         if (!hwif->irq) {
1305                 printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
1306                         hwif->name, old_irq);
1307                 goto out;
1308         }
1309         if (init_irq(hwif)) {
1310                 printk(KERN_ERR "%s: probed IRQ %d and default IRQ %d failed\n",
1311                         hwif->name, old_irq, hwif->irq);
1312                 goto out;
1313         }
1314         printk(KERN_WARNING "%s: probed IRQ %d failed, using default\n",
1315                 hwif->name, hwif->irq);
1316
1317 done:
1318         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1319                             THIS_MODULE, ata_probe, ata_lock, hwif);
1320         return 1;
1321
1322 out:
1323         unregister_blkdev(hwif->major, hwif->name);
1324         return 0;
1325 }
1326
1327 static void hwif_register_devices(ide_hwif_t *hwif)
1328 {
1329         unsigned int i;
1330
1331         for (i = 0; i < MAX_DRIVES; i++) {
1332                 ide_drive_t *drive = &hwif->drives[i];
1333                 struct device *dev = &drive->gendev;
1334                 int ret;
1335
1336                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
1337                         continue;
1338
1339                 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1340                 dev->parent = &hwif->gendev;
1341                 dev->bus = &ide_bus_type;
1342                 dev->driver_data = drive;
1343                 dev->release = drive_release_dev;
1344
1345                 ret = device_register(dev);
1346                 if (ret < 0)
1347                         printk(KERN_WARNING "IDE: %s: device_register error: "
1348                                             "%d\n", __func__, ret);
1349         }
1350 }
1351
1352 static void ide_port_init_devices(ide_hwif_t *hwif)
1353 {
1354         const struct ide_port_ops *port_ops = hwif->port_ops;
1355         int i;
1356
1357         for (i = 0; i < MAX_DRIVES; i++) {
1358                 ide_drive_t *drive = &hwif->drives[i];
1359
1360                 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1361                         drive->io_32bit = 1;
1362                 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1363                         drive->dev_flags |= IDE_DFLAG_UNMASK;
1364                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1365                         drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
1366
1367                 if (port_ops && port_ops->init_dev)
1368                         port_ops->init_dev(drive);
1369         }
1370 }
1371
1372 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1373                           const struct ide_port_info *d)
1374 {
1375         hwif->channel = port;
1376
1377         if (d->chipset)
1378                 hwif->chipset = d->chipset;
1379
1380         if (d->init_iops)
1381                 d->init_iops(hwif);
1382
1383         if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1384             (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1385                 hwif->irq = port ? 15 : 14;
1386
1387         /* ->host_flags may be set by ->init_iops (or even earlier...) */
1388         hwif->host_flags |= d->host_flags;
1389         hwif->pio_mask = d->pio_mask;
1390
1391         if (d->tp_ops)
1392                 hwif->tp_ops = d->tp_ops;
1393
1394         /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1395         if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1396                 hwif->port_ops = d->port_ops;
1397
1398         hwif->swdma_mask = d->swdma_mask;
1399         hwif->mwdma_mask = d->mwdma_mask;
1400         hwif->ultra_mask = d->udma_mask;
1401
1402         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1403                 int rc;
1404
1405                 if (d->init_dma)
1406                         rc = d->init_dma(hwif, d);
1407                 else
1408                         rc = ide_hwif_setup_dma(hwif, d);
1409
1410                 if (rc < 0) {
1411                         printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1412                         hwif->dma_base = 0;
1413                         hwif->swdma_mask = 0;
1414                         hwif->mwdma_mask = 0;
1415                         hwif->ultra_mask = 0;
1416                 } else if (d->dma_ops)
1417                         hwif->dma_ops = d->dma_ops;
1418         }
1419
1420         if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1421             ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1422                 if (hwif->mate)
1423                         hwif->mate->serialized = hwif->serialized = 1;
1424         }
1425
1426         if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1427                 hwif->rqsize = 256;
1428
1429         /* call chipset specific routine for each enabled port */
1430         if (d->init_hwif)
1431                 d->init_hwif(hwif);
1432 }
1433
1434 static void ide_port_cable_detect(ide_hwif_t *hwif)
1435 {
1436         const struct ide_port_ops *port_ops = hwif->port_ops;
1437
1438         if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1439                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1440                         hwif->cbl = port_ops->cable_detect(hwif);
1441         }
1442 }
1443
1444 static ssize_t store_delete_devices(struct device *portdev,
1445                                     struct device_attribute *attr,
1446                                     const char *buf, size_t n)
1447 {
1448         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1449
1450         if (strncmp(buf, "1", n))
1451                 return -EINVAL;
1452
1453         ide_port_unregister_devices(hwif);
1454
1455         return n;
1456 };
1457
1458 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1459
1460 static ssize_t store_scan(struct device *portdev,
1461                           struct device_attribute *attr,
1462                           const char *buf, size_t n)
1463 {
1464         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1465
1466         if (strncmp(buf, "1", n))
1467                 return -EINVAL;
1468
1469         ide_port_unregister_devices(hwif);
1470         ide_port_scan(hwif);
1471
1472         return n;
1473 };
1474
1475 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1476
1477 static struct device_attribute *ide_port_attrs[] = {
1478         &dev_attr_delete_devices,
1479         &dev_attr_scan,
1480         NULL
1481 };
1482
1483 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1484 {
1485         int i, uninitialized_var(rc);
1486
1487         for (i = 0; ide_port_attrs[i]; i++) {
1488                 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1489                 if (rc)
1490                         break;
1491         }
1492
1493         return rc;
1494 }
1495
1496 static unsigned int ide_indexes;
1497
1498 /**
1499  *      ide_find_port_slot      -       find free port slot
1500  *      @d: IDE port info
1501  *
1502  *      Return the new port slot index or -ENOENT if we are out of free slots.
1503  */
1504
1505 static int ide_find_port_slot(const struct ide_port_info *d)
1506 {
1507         int idx = -ENOENT;
1508         u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1509         u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
1510
1511         /*
1512          * Claim an unassigned slot.
1513          *
1514          * Give preference to claiming other slots before claiming ide0/ide1,
1515          * just in case there's another interface yet-to-be-scanned
1516          * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1517          *
1518          * Unless there is a bootable card that does not use the standard
1519          * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1520          */
1521         mutex_lock(&ide_cfg_mtx);
1522         if (bootable) {
1523                 if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1524                         idx = ffz(ide_indexes | i);
1525         } else {
1526                 if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1527                         idx = ffz(ide_indexes | 3);
1528                 else if ((ide_indexes & 3) != 3)
1529                         idx = ffz(ide_indexes);
1530         }
1531         if (idx >= 0)
1532                 ide_indexes |= (1 << idx);
1533         mutex_unlock(&ide_cfg_mtx);
1534
1535         return idx;
1536 }
1537
1538 static void ide_free_port_slot(int idx)
1539 {
1540         mutex_lock(&ide_cfg_mtx);
1541         ide_indexes &= ~(1 << idx);
1542         mutex_unlock(&ide_cfg_mtx);
1543 }
1544
1545 struct ide_host *ide_host_alloc_all(const struct ide_port_info *d,
1546                                     hw_regs_t **hws)
1547 {
1548         struct ide_host *host;
1549         int i;
1550
1551         host = kzalloc(sizeof(*host), GFP_KERNEL);
1552         if (host == NULL)
1553                 return NULL;
1554
1555         for (i = 0; i < MAX_HWIFS; i++) {
1556                 ide_hwif_t *hwif;
1557                 int idx;
1558
1559                 if (hws[i] == NULL)
1560                         continue;
1561
1562                 hwif = kzalloc(sizeof(*hwif), GFP_KERNEL);
1563                 if (hwif == NULL)
1564                         continue;
1565
1566                 idx = ide_find_port_slot(d);
1567                 if (idx < 0) {
1568                         printk(KERN_ERR "%s: no free slot for interface\n",
1569                                         d ? d->name : "ide");
1570                         kfree(hwif);
1571                         continue;
1572                 }
1573
1574                 ide_init_port_data(hwif, idx);
1575
1576                 hwif->host = host;
1577
1578                 host->ports[i] = hwif;
1579                 host->n_ports++;
1580         }
1581
1582         if (host->n_ports == 0) {
1583                 kfree(host);
1584                 return NULL;
1585         }
1586
1587         if (hws[0])
1588                 host->dev[0] = hws[0]->dev;
1589
1590         if (d) {
1591                 host->init_chipset = d->init_chipset;
1592                 host->host_flags = d->host_flags;
1593         }
1594
1595         return host;
1596 }
1597 EXPORT_SYMBOL_GPL(ide_host_alloc_all);
1598
1599 struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
1600 {
1601         hw_regs_t *hws_all[MAX_HWIFS];
1602         int i;
1603
1604         for (i = 0; i < MAX_HWIFS; i++)
1605                 hws_all[i] = (i < 4) ? hws[i] : NULL;
1606
1607         return ide_host_alloc_all(d, hws_all);
1608 }
1609 EXPORT_SYMBOL_GPL(ide_host_alloc);
1610
1611 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1612                       hw_regs_t **hws)
1613 {
1614         ide_hwif_t *hwif, *mate = NULL;
1615         int i, j = 0;
1616
1617         for (i = 0; i < MAX_HWIFS; i++) {
1618                 hwif = host->ports[i];
1619
1620                 if (hwif == NULL) {
1621                         mate = NULL;
1622                         continue;
1623                 }
1624
1625                 ide_init_port_hw(hwif, hws[i]);
1626                 ide_port_apply_params(hwif);
1627
1628                 if (d == NULL) {
1629                         mate = NULL;
1630                         continue;
1631                 }
1632
1633                 if ((i & 1) && mate) {
1634                         hwif->mate = mate;
1635                         mate->mate = hwif;
1636                 }
1637
1638                 mate = (i & 1) ? NULL : hwif;
1639
1640                 ide_init_port(hwif, i & 1, d);
1641                 ide_port_cable_detect(hwif);
1642                 ide_port_init_devices(hwif);
1643         }
1644
1645         for (i = 0; i < MAX_HWIFS; i++) {
1646                 hwif = host->ports[i];
1647
1648                 if (hwif == NULL)
1649                         continue;
1650
1651                 if (ide_probe_port(hwif) == 0)
1652                         hwif->present = 1;
1653
1654                 if (hwif->chipset != ide_4drives || !hwif->mate ||
1655                     !hwif->mate->present)
1656                         ide_register_port(hwif);
1657
1658                 if (hwif->present)
1659                         ide_port_tune_devices(hwif);
1660         }
1661
1662         for (i = 0; i < MAX_HWIFS; i++) {
1663                 hwif = host->ports[i];
1664
1665                 if (hwif == NULL)
1666                         continue;
1667
1668                 if (hwif_init(hwif) == 0) {
1669                         printk(KERN_INFO "%s: failed to initialize IDE "
1670                                          "interface\n", hwif->name);
1671                         hwif->present = 0;
1672                         continue;
1673                 }
1674
1675                 j++;
1676
1677                 if (hwif->present)
1678                         ide_port_setup_devices(hwif);
1679
1680                 ide_acpi_init(hwif);
1681
1682                 if (hwif->present)
1683                         ide_acpi_port_init_devices(hwif);
1684         }
1685
1686         for (i = 0; i < MAX_HWIFS; i++) {
1687                 hwif = host->ports[i];
1688
1689                 if (hwif == NULL)
1690                         continue;
1691
1692                 if (hwif->chipset == ide_unknown)
1693                         hwif->chipset = ide_generic;
1694
1695                 if (hwif->present)
1696                         hwif_register_devices(hwif);
1697         }
1698
1699         for (i = 0; i < MAX_HWIFS; i++) {
1700                 hwif = host->ports[i];
1701
1702                 if (hwif == NULL)
1703                         continue;
1704
1705                 ide_sysfs_register_port(hwif);
1706                 ide_proc_register_port(hwif);
1707
1708                 if (hwif->present)
1709                         ide_proc_port_register_devices(hwif);
1710         }
1711
1712         return j ? 0 : -1;
1713 }
1714 EXPORT_SYMBOL_GPL(ide_host_register);
1715
1716 int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
1717                  struct ide_host **hostp)
1718 {
1719         struct ide_host *host;
1720         int rc;
1721
1722         host = ide_host_alloc(d, hws);
1723         if (host == NULL)
1724                 return -ENOMEM;
1725
1726         rc = ide_host_register(host, d, hws);
1727         if (rc) {
1728                 ide_host_free(host);
1729                 return rc;
1730         }
1731
1732         if (hostp)
1733                 *hostp = host;
1734
1735         return 0;
1736 }
1737 EXPORT_SYMBOL_GPL(ide_host_add);
1738
1739 void ide_host_free(struct ide_host *host)
1740 {
1741         ide_hwif_t *hwif;
1742         int i;
1743
1744         for (i = 0; i < MAX_HWIFS; i++) {
1745                 hwif = host->ports[i];
1746
1747                 if (hwif == NULL)
1748                         continue;
1749
1750                 ide_free_port_slot(hwif->index);
1751                 kfree(hwif);
1752         }
1753
1754         kfree(host);
1755 }
1756 EXPORT_SYMBOL_GPL(ide_host_free);
1757
1758 void ide_host_remove(struct ide_host *host)
1759 {
1760         int i;
1761
1762         for (i = 0; i < MAX_HWIFS; i++) {
1763                 if (host->ports[i])
1764                         ide_unregister(host->ports[i]);
1765         }
1766
1767         ide_host_free(host);
1768 }
1769 EXPORT_SYMBOL_GPL(ide_host_remove);
1770
1771 void ide_port_scan(ide_hwif_t *hwif)
1772 {
1773         ide_port_apply_params(hwif);
1774         ide_port_cable_detect(hwif);
1775         ide_port_init_devices(hwif);
1776
1777         if (ide_probe_port(hwif) < 0)
1778                 return;
1779
1780         hwif->present = 1;
1781
1782         ide_port_tune_devices(hwif);
1783         ide_acpi_port_init_devices(hwif);
1784         ide_port_setup_devices(hwif);
1785         hwif_register_devices(hwif);
1786         ide_proc_port_register_devices(hwif);
1787 }
1788 EXPORT_SYMBOL_GPL(ide_port_scan);
1789
1790 static void ide_legacy_init_one(hw_regs_t **hws, hw_regs_t *hw,
1791                                 u8 port_no, const struct ide_port_info *d,
1792                                 unsigned long config)
1793 {
1794         unsigned long base, ctl;
1795         int irq;
1796
1797         if (port_no == 0) {
1798                 base = 0x1f0;
1799                 ctl  = 0x3f6;
1800                 irq  = 14;
1801         } else {
1802                 base = 0x170;
1803                 ctl  = 0x376;
1804                 irq  = 15;
1805         }
1806
1807         if (!request_region(base, 8, d->name)) {
1808                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1809                                 d->name, base, base + 7);
1810                 return;
1811         }
1812
1813         if (!request_region(ctl, 1, d->name)) {
1814                 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1815                                 d->name, ctl);
1816                 release_region(base, 8);
1817                 return;
1818         }
1819
1820         ide_std_init_ports(hw, base, ctl);
1821         hw->irq = irq;
1822         hw->chipset = d->chipset;
1823         hw->config = config;
1824
1825         hws[port_no] = hw;
1826 }
1827
1828 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
1829 {
1830         hw_regs_t hw[2], *hws[] = { NULL, NULL, NULL, NULL };
1831
1832         memset(&hw, 0, sizeof(hw));
1833
1834         if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
1835                 ide_legacy_init_one(hws, &hw[0], 0, d, config);
1836         ide_legacy_init_one(hws, &hw[1], 1, d, config);
1837
1838         if (hws[0] == NULL && hws[1] == NULL &&
1839             (d->host_flags & IDE_HFLAG_SINGLE))
1840                 return -ENOENT;
1841
1842         return ide_host_add(d, hws, NULL);
1843 }
1844 EXPORT_SYMBOL_GPL(ide_legacy_device_add);