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