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         drive->id->cyls = drive->cyl;
  54         drive->id->heads = drive->head;
  55         drive->id->sectors = drive->sect;
  56         drive->id->cur_cyls = drive->cyl;
  57         drive->id->cur_heads = drive->head;
  58         drive->id->cur_sectors = drive->sect;
  59 }
  60
  61 static void ide_disk_init_chs(ide_drive_t *drive)
  62 {
  63         struct hd_driveid *id = drive->id;
  64
  65         /* Extract geometry if we did not already have one for the drive */
  66         if (!drive->cyl || !drive->head || !drive->sect) {
  67                 drive->cyl  = drive->bios_cyl  = id->cyls;
  68                 drive->head = drive->bios_head = id->heads;
  69                 drive->sect = drive->bios_sect = id->sectors;
  70         }
  71
  72         /* Handle logical geometry translation by the drive */
  73         if ((id->field_valid & 1) && id->cur_cyls &&
  74             id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
  75                 drive->cyl  = id->cur_cyls;
  76                 drive->head = id->cur_heads;
  77                 drive->sect = id->cur_sectors;
  78         }
  79
  80         /* Use physical geometry if what we have still makes no sense */
  81         if (drive->head > 16 && id->heads && id->heads <= 16) {
  82                 drive->cyl  = id->cyls;
  83                 drive->head = id->heads;
  84                 drive->sect = id->sectors;
  85         }
  86 }
  87
  88 static void ide_disk_init_mult_count(ide_drive_t *drive)
  89 {
  90         struct hd_driveid *id = drive->id;
  91
  92         drive->mult_count = 0;
  93         if (id->max_multsect) {
  94 #ifdef CONFIG_IDEDISK_MULTI_MODE
  95                 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
  96                 id->multsect_valid = id->multsect ? 1 : 0;
  97                 drive->mult_req = id->multsect_valid ? id->max_multsect : 0;
  98                 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
  99 #else   /* original, pre IDE-NFG, per request of AC */
 100                 drive->mult_req = 0;
 101                 if (drive->mult_req > id->max_multsect)
 102                         drive->mult_req = id->max_multsect;
 103                 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
 104                         drive->special.b.set_multmode = 1;
 105 #endif
 106         }
 107 }
 108
 109 /**
 110  *      do_identify     -       identify a drive
 111  *      @drive: drive to identify
 112  *      @cmd: command used
 113  *
 114  *      Called when we have issued a drive identify command to
 115  *      read and parse the results. This function is run with
 116  *      interrupts disabled.
 117  */
 118
 119 static inline void do_identify (ide_drive_t *drive, u8 cmd)
 120 {
 121         ide_hwif_t *hwif = HWIF(drive);
 122         int bswap = 1;
 123         struct hd_driveid *id;
 124
 125         id = drive->id;
 126         /* read 512 bytes of id info */
 127         hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
 128
 129         drive->id_read = 1;
 130         local_irq_enable();
 131 #ifdef DEBUG
 132         printk(KERN_INFO "%s: dumping identify data\n", drive->name);
 133         ide_dump_identify((u8 *)id);
 134 #endif
 135         ide_fix_driveid(id);
 136
 137         /*
 138          *  WIN_IDENTIFY returns little-endian info,
 139          *  WIN_PIDENTIFY *usually* returns little-endian info.
 140          */
 141         if (cmd == WIN_PIDENTIFY) {
 142                 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
 143                  || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
 144                  || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
 145                         /* Vertos drives may still be weird */
 146                         bswap ^= 1;
 147         }
 148         ide_fixstring(id->model,     sizeof(id->model),     bswap);
 149         ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
 150         ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
 151
 152         /* we depend on this a lot! */
 153         id->model[sizeof(id->model)-1] = '\0';
 154
 155         if (strstr(id->model, "E X A B Y T E N E S T"))
 156                 goto err_misc;
 157
 158         printk(KERN_INFO "%s: %s, ", drive->name, id->model);
 159
 160         drive->present = 1;
 161         drive->dead = 0;
 162
 163         /*
 164          * Check for an ATAPI device
 165          */
 166         if (cmd == WIN_PIDENTIFY) {
 167                 u8 type = (id->config >> 8) & 0x1f;
 168
 169                 printk(KERN_CONT "ATAPI ");
 170                 switch (type) {
 171                         case ide_floppy:
 172                                 if (!strstr(id->model, "CD-ROM")) {
 173                                         if (!strstr(id->model, "oppy") &&
 174                                             !strstr(id->model, "poyp") &&
 175                                             !strstr(id->model, "ZIP"))
 176                                                 printk(KERN_CONT "cdrom or floppy?, assuming ");
 177                                         if (drive->media != ide_cdrom) {
 178                                                 printk(KERN_CONT "FLOPPY");
 179                                                 drive->removable = 1;
 180                                                 break;
 181                                         }
 182                                 }
 183                                 /* Early cdrom models used zero */
 184                                 type = ide_cdrom;
 185                         case ide_cdrom:
 186                                 drive->removable = 1;
 187 #ifdef CONFIG_PPC
 188                                 /* kludge for Apple PowerBook internal zip */
 189                                 if (!strstr(id->model, "CD-ROM") &&
 190                                     strstr(id->model, "ZIP")) {
 191                                         printk(KERN_CONT "FLOPPY");
 192                                         type = ide_floppy;
 193                                         break;
 194                                 }
 195 #endif
 196                                 printk(KERN_CONT "CD/DVD-ROM");
 197                                 break;
 198                         case ide_tape:
 199                                 printk(KERN_CONT "TAPE");
 200                                 break;
 201                         case ide_optical:
 202                                 printk(KERN_CONT "OPTICAL");
 203                                 drive->removable = 1;
 204                                 break;
 205                         default:
 206                                 printk(KERN_CONT "UNKNOWN (type %d)", type);
 207                                 break;
 208                 }
 209                 printk(KERN_CONT " drive\n");
 210                 drive->media = type;
 211                 /* an ATAPI device ignores DRDY */
 212                 drive->ready_stat = 0;
 213                 return;
 214         }
 215
 216         /*
 217          * Not an ATAPI device: looks like a "regular" hard disk
 218          */
 219
 220         /*
 221          * 0x848a = CompactFlash device
 222          * These are *not* removable in Linux definition of the term
 223          */
 224
 225         if ((id->config != 0x848a) && (id->config & (1<<7)))
 226                 drive->removable = 1;
 227
 228         drive->media = ide_disk;
 229
 230         printk(KERN_CONT "%s DISK drive\n",
 231                 (id->config == 0x848a) ? "CFA" : "ATA");
 232
 233         return;
 234
 235 err_misc:
 236         kfree(id);
 237         drive->present = 0;
 238         return;
 239 }
 240
 241 /**
 242  *      actual_try_to_identify  -       send ata/atapi identify
 243  *      @drive: drive to identify
 244  *      @cmd: command to use
 245  *
 246  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 247  *      and waits for a response.  It also monitors irqs while this is
 248  *      happening, in hope of automatically determining which one is
 249  *      being used by the interface.
 250  *
 251  *      Returns:        0  device was identified
 252  *                      1  device timed-out (no response to identify request)
 253  *                      2  device aborted the command (refused to identify itself)
 254  */
 255
 256 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 257 {
 258         ide_hwif_t *hwif = HWIF(drive);
 259         struct ide_io_ports *io_ports = &hwif->io_ports;
 260         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 261         int use_altstatus = 0, rc;
 262         unsigned long timeout;
 263         u8 s = 0, a = 0;
 264
 265         /* take a deep breath */
 266         msleep(50);
 267
 268         if (io_ports->ctl_addr) {
 269                 a = tp_ops->read_altstatus(hwif);
 270                 s = tp_ops->read_status(hwif);
 271                 if ((a ^ s) & ~INDEX_STAT)
 272                         /* ancient Seagate drives, broken interfaces */
 273                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
 274                                          "instead of ALTSTATUS(0x%02x)\n",
 275                                          drive->name, s, a);
 276                 else
 277                         /* use non-intrusive polling */
 278                         use_altstatus = 1;
 279         }
 280
 281         /* set features register for atapi
 282          * identify command to be sure of reply
 283          */
 284         if (cmd == WIN_PIDENTIFY) {
 285                 ide_task_t task;
 286
 287                 memset(&task, 0, sizeof(task));
 288                 /* disable DMA & overlap */
 289                 task.tf_flags = IDE_TFLAG_OUT_FEATURE;
 290
 291                 tp_ops->tf_load(drive, &task);
 292         }
 293
 294         /* ask drive for ID */
 295         tp_ops->exec_command(hwif, cmd);
 296
 297         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 298         timeout += jiffies;
 299         do {
 300                 if (time_after(jiffies, timeout)) {
 301                         /* drive timed-out */
 302                         return 1;
 303                 }
 304                 /* give drive a breather */
 305                 msleep(50);
 306                 s = use_altstatus ? tp_ops->read_altstatus(hwif)
 307                                   : tp_ops->read_status(hwif);
 308         } while (s & BUSY_STAT);
 309
 310         /* wait for IRQ and DRQ_STAT */
 311         msleep(50);
 312         s = tp_ops->read_status(hwif);
 313
 314         if (OK_STAT(s, DRQ_STAT, BAD_R_STAT)) {
 315                 unsigned long flags;
 316
 317                 /* local CPU only; some systems need this */
 318                 local_irq_save(flags);
 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                 local_irq_restore(flags);
 326         } else {
 327                 /* drive refused ID */
 328                 rc = 2;
 329         }
 330         return rc;
 331 }
 332
 333 /**
 334  *      try_to_identify -       try to identify a drive
 335  *      @drive: drive to probe
 336  *      @cmd: command to use
 337  *
 338  *      Issue the identify command and then do IRQ probing to
 339  *      complete the identification when needed by finding the
 340  *      IRQ the drive is attached to
 341  */
 342
 343 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 344 {
 345         ide_hwif_t *hwif = HWIF(drive);
 346         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 347         int retval;
 348         int autoprobe = 0;
 349         unsigned long cookie = 0;
 350
 351         /*
 352          * Disable device irq unless we need to
 353          * probe for it. Otherwise we'll get spurious
 354          * interrupts during the identify-phase that
 355          * the irq handler isn't expecting.
 356          */
 357         if (hwif->io_ports.ctl_addr) {
 358                 if (!hwif->irq) {
 359                         autoprobe = 1;
 360                         cookie = probe_irq_on();
 361                 }
 362                 tp_ops->set_irq(hwif, autoprobe);
 363         }
 364
 365         retval = actual_try_to_identify(drive, cmd);
 366
 367         if (autoprobe) {
 368                 int irq;
 369
 370                 tp_ops->set_irq(hwif, 0);
 371                 /* clear drive IRQ */
 372                 (void)tp_ops->read_status(hwif);
 373                 udelay(5);
 374                 irq = probe_irq_off(cookie);
 375                 if (!hwif->irq) {
 376                         if (irq > 0) {
 377                                 hwif->irq = irq;
 378                         } else {
 379                                 /* Mmmm.. multiple IRQs..
 380                                  * don't know which was ours
 381                                  */
 382                                 printk(KERN_ERR "%s: IRQ probe failed (0x%lx)\n",
 383                                         drive->name, cookie);
 384                         }
 385                 }
 386         }
 387         return retval;
 388 }
 389
 390 static int ide_busy_sleep(ide_hwif_t *hwif)
 391 {
 392         unsigned long timeout = jiffies + WAIT_WORSTCASE;
 393         u8 stat;
 394
 395         do {
 396                 msleep(50);
 397                 stat = hwif->tp_ops->read_status(hwif);
 398                 if ((stat & BUSY_STAT) == 0)
 399                         return 0;
 400         } while (time_before(jiffies, timeout));
 401
 402         return 1;
 403 }
 404
 405 static u8 ide_read_device(ide_drive_t *drive)
 406 {
 407         ide_task_t task;
 408
 409         memset(&task, 0, sizeof(task));
 410         task.tf_flags = IDE_TFLAG_IN_DEVICE;
 411
 412         drive->hwif->tp_ops->tf_read(drive, &task);
 413
 414         return task.tf.device;
 415 }
 416
 417 /**
 418  *      do_probe                -       probe an IDE device
 419  *      @drive: drive to probe
 420  *      @cmd: command to use
 421  *
 422  *      do_probe() has the difficult job of finding a drive if it exists,
 423  *      without getting hung up if it doesn't exist, without trampling on
 424  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 425  *
 426  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 427  *      but does not respond right away, the probe will "hang in there"
 428  *      for the maximum wait time (about 30 seconds), otherwise it will
 429  *      exit much more quickly.
 430  *
 431  * Returns:     0  device was identified
 432  *              1  device timed-out (no response to identify request)
 433  *              2  device aborted the command (refused to identify itself)
 434  *              3  bad status from device (possible for ATAPI drives)
 435  *              4  probe was not attempted because failure was obvious
 436  */
 437
 438 static int do_probe (ide_drive_t *drive, u8 cmd)
 439 {
 440         ide_hwif_t *hwif = HWIF(drive);
 441         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 442         int rc;
 443         u8 stat;
 444
 445         if (drive->present) {
 446                 /* avoid waiting for inappropriate probes */
 447                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
 448                         return 4;
 449         }
 450 #ifdef DEBUG
 451         printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
 452                 drive->name, drive->present, drive->media,
 453                 (cmd == WIN_IDENTIFY) ? "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.all && !drive->present) {
 464                 if (drive->select.b.unit != 0) {
 465                         /* exit with drive0 selected */
 466                         SELECT_DRIVE(&hwif->drives[0]);
 467                         /* allow BUSY_STAT 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, READY_STAT, BUSY_STAT) ||
 477             drive->present || cmd == WIN_PIDENTIFY) {
 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 == (BUSY_STAT | READY_STAT))
 487                         return 4;
 488
 489                 if (rc == 1 && cmd == WIN_PIDENTIFY) {
 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, WIN_SRST);
 496                         (void)ide_busy_sleep(hwif);
 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->select.b.unit != 0) {
 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 -- ", hwif->name, drive->id->model);
 530
 531         SELECT_DRIVE(drive);
 532         msleep(50);
 533         tp_ops->exec_command(hwif, EXABYTE_ENABLE_NEST);
 534
 535         if (ide_busy_sleep(hwif)) {
 536                 printk(KERN_CONT "failed (timeout)\n");
 537                 return;
 538         }
 539
 540         msleep(50);
 541
 542         stat = tp_ops->read_status(hwif);
 543
 544         if (!OK_STAT(stat, 0, BAD_STAT))
 545                 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
 546         else
 547                 printk(KERN_CONT "success\n");
 548
 549         /* if !(success||timed-out) */
 550         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 551                 /* look for ATAPI device */
 552                 (void) do_probe(drive, WIN_PIDENTIFY);
 553         }
 554 }
 555
 556 /**
 557  *      probe_for_drives        -       upper level drive probe
 558  *      @drive: drive to probe for
 559  *
 560  *      probe_for_drive() tests for existence of a given drive using do_probe()
 561  *      and presents things to the user as needed.
 562  *
 563  *      Returns:        0  no device was found
 564  *                      1  device was found (note: drive->present might
 565  *                         still be 0)
 566  */
 567
 568 static inline u8 probe_for_drive (ide_drive_t *drive)
 569 {
 570         /*
 571          *      In order to keep things simple we have an id
 572          *      block for all drives at all times. If the device
 573          *      is pre ATA or refuses ATA/ATAPI identify we
 574          *      will add faked data to this.
 575          *
 576          *      Also note that 0 everywhere means "can't do X"
 577          */
 578
 579         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
 580         drive->id_read = 0;
 581         if(drive->id == NULL)
 582         {
 583                 printk(KERN_ERR "ide: out of memory for id data.\n");
 584                 return 0;
 585         }
 586         strcpy(drive->id->model, "UNKNOWN");
 587
 588         /* skip probing? */
 589         if (!drive->noprobe)
 590         {
 591                 /* if !(success||timed-out) */
 592                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 593                         /* look for ATAPI device */
 594                         (void) do_probe(drive, WIN_PIDENTIFY);
 595                 }
 596                 if (!drive->present)
 597                         /* drive not found */
 598                         return 0;
 599                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
 600                         enable_nest(drive);
 601
 602                 /* identification failed? */
 603                 if (!drive->id_read) {
 604                         if (drive->media == ide_disk) {
 605                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 606                                         drive->name, drive->cyl,
 607                                         drive->head, drive->sect);
 608                         } else if (drive->media == ide_cdrom) {
 609                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 610                         } else {
 611                                 /* nuke it */
 612                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 613                                 drive->present = 0;
 614                         }
 615                 }
 616                 /* drive was found */
 617         }
 618         if(!drive->present)
 619                 return 0;
 620         /* The drive wasn't being helpful. Add generic info only */
 621         if (drive->id_read == 0) {
 622                 generic_id(drive);
 623                 return 1;
 624         }
 625
 626         if (drive->media == ide_disk) {
 627                 ide_disk_init_chs(drive);
 628                 ide_disk_init_mult_count(drive);
 629         }
 630
 631         return drive->present;
 632 }
 633
 634 static void hwif_release_dev(struct device *dev)
 635 {
 636         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 637
 638         complete(&hwif->gendev_rel_comp);
 639 }
 640
 641 static int ide_register_port(ide_hwif_t *hwif)
 642 {
 643         int ret;
 644
 645         /* register with global device tree */
 646         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 647         hwif->gendev.driver_data = hwif;
 648         if (hwif->gendev.parent == NULL) {
 649                 if (hwif->dev)
 650                         hwif->gendev.parent = hwif->dev;
 651                 else
 652                         /* Would like to do = &device_legacy */
 653                         hwif->gendev.parent = NULL;
 654         }
 655         hwif->gendev.release = hwif_release_dev;
 656         ret = device_register(&hwif->gendev);
 657         if (ret < 0) {
 658                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
 659                         __func__, ret);
 660                 goto out;
 661         }
 662
 663         hwif->portdev = device_create_drvdata(ide_port_class, &hwif->gendev,
 664                                               MKDEV(0, 0), hwif, hwif->name);
 665         if (IS_ERR(hwif->portdev)) {
 666                 ret = PTR_ERR(hwif->portdev);
 667                 device_unregister(&hwif->gendev);
 668         }
 669 out:
 670         return ret;
 671 }
 672
 673 /**
 674  *      ide_port_wait_ready     -       wait for port to become ready
 675  *      @hwif: IDE port
 676  *
 677  *      This is needed on some PPCs and a bunch of BIOS-less embedded
 678  *      platforms.  Typical cases are:
 679  *
 680  *      - The firmware hard reset the disk before booting the kernel,
 681  *        the drive is still doing it's poweron-reset sequence, that
 682  *        can take up to 30 seconds.
 683  *
 684  *      - The firmware does nothing (or no firmware), the device is
 685  *        still in POST state (same as above actually).
 686  *
 687  *      - Some CD/DVD/Writer combo drives tend to drive the bus during
 688  *        their reset sequence even when they are non-selected slave
 689  *        devices, thus preventing discovery of the main HD.
 690  *
 691  *      Doing this wait-for-non-busy should not harm any existing
 692  *      configuration and fix some issues like the above.
 693  *
 694  *      BenH.
 695  *
 696  *      Returns 0 on success, error code (< 0) otherwise.
 697  */
 698
 699 static int ide_port_wait_ready(ide_hwif_t *hwif)
 700 {
 701         int unit, rc;
 702
 703         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 704
 705         /* Let HW settle down a bit from whatever init state we
 706          * come from */
 707         mdelay(2);
 708
 709         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 710          * I know of at least one disk who takes 31 seconds, I use 35
 711          * here to be safe
 712          */
 713         rc = ide_wait_not_busy(hwif, 35000);
 714         if (rc)
 715                 return rc;
 716
 717         /* Now make sure both master & slave are ready */
 718         for (unit = 0; unit < MAX_DRIVES; unit++) {
 719                 ide_drive_t *drive = &hwif->drives[unit];
 720
 721                 /* Ignore disks that we will not probe for later. */
 722                 if (!drive->noprobe || drive->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  *      @drive1: drive
 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 *drive1)
 751 {
 752         ide_drive_t *drive0 = &drive1->hwif->drives[0];
 753
 754         if ((drive1->dn & 1) == 0 || drive0->present == 0)
 755                 return;
 756
 757         /* If the models don't match they are not the same product */
 758         if (strcmp(drive0->id->model, drive1->id->model))
 759                 return;
 760
 761         /* Serial numbers do not match */
 762         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
 763                 return;
 764
 765         /* No serial number, thankfully very rare for CF */
 766         if (drive0->id->serial_no[0] == 0)
 767                 return;
 768
 769         /* Appears to be an IDE flash adapter with decode bugs */
 770         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 771
 772         drive1->present = 0;
 773 }
 774
 775 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 776
 777 static int ide_probe_port(ide_hwif_t *hwif)
 778 {
 779         unsigned long flags;
 780         unsigned int irqd;
 781         int unit, rc = -ENODEV;
 782
 783         BUG_ON(hwif->present);
 784
 785         if (hwif->drives[0].noprobe && hwif->drives[1].noprobe)
 786                 return -EACCES;
 787
 788         /*
 789          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 790          * we'll install our IRQ driver much later...
 791          */
 792         irqd = hwif->irq;
 793         if (irqd)
 794                 disable_irq(hwif->irq);
 795
 796         local_irq_set(flags);
 797
 798         if (ide_port_wait_ready(hwif) == -EBUSY)
 799                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 800
 801         /*
 802          * Second drive should only exist if first drive was found,
 803          * but a lot of cdrom drives are configured as single slaves.
 804          */
 805         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 806                 ide_drive_t *drive = &hwif->drives[unit];
 807                 drive->dn = (hwif->channel ? 2 : 0) + unit;
 808                 (void) probe_for_drive(drive);
 809                 if (drive->present)
 810                         rc = 0;
 811         }
 812
 813         local_irq_restore(flags);
 814
 815         /*
 816          * Use cached IRQ number. It might be (and is...) changed by probe
 817          * code above
 818          */
 819         if (irqd)
 820                 enable_irq(irqd);
 821
 822         return rc;
 823 }
 824
 825 static void ide_port_tune_devices(ide_hwif_t *hwif)
 826 {
 827         const struct ide_port_ops *port_ops = hwif->port_ops;
 828         int unit;
 829
 830         for (unit = 0; unit < MAX_DRIVES; unit++) {
 831                 ide_drive_t *drive = &hwif->drives[unit];
 832
 833                 if (drive->present && port_ops && port_ops->quirkproc)
 834                         port_ops->quirkproc(drive);
 835         }
 836
 837         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 838                 ide_drive_t *drive = &hwif->drives[unit];
 839
 840                 if (drive->present) {
 841                         ide_set_max_pio(drive);
 842
 843                         drive->nice1 = 1;
 844
 845                         if (hwif->dma_ops)
 846                                 ide_set_dma(drive);
 847                 }
 848         }
 849
 850         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 851                 ide_drive_t *drive = &hwif->drives[unit];
 852
 853                 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
 854                         drive->no_io_32bit = 1;
 855                 else
 856                         drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
 857         }
 858 }
 859
 860 #if MAX_HWIFS > 1
 861 /*
 862  * save_match() is used to simplify logic in init_irq() below.
 863  *
 864  * A loophole here is that we may not know about a particular
 865  * hwif's irq until after that hwif is actually probed/initialized..
 866  * This could be a problem for the case where an hwif is on a
 867  * dual interface that requires serialization (eg. cmd640) and another
 868  * hwif using one of the same irqs is initialized beforehand.
 869  *
 870  * This routine detects and reports such situations, but does not fix them.
 871  */
 872 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 873 {
 874         ide_hwif_t *m = *match;
 875
 876         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 877                 if (!new->hwgroup)
 878                         return;
 879                 printk(KERN_WARNING "%s: potential IRQ problem with %s and %s\n",
 880                         hwif->name, new->name, m->name);
 881         }
 882         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 883                 *match = new;
 884 }
 885 #endif /* MAX_HWIFS > 1 */
 886
 887 /*
 888  * init request queue
 889  */
 890 static int ide_init_queue(ide_drive_t *drive)
 891 {
 892         struct request_queue *q;
 893         ide_hwif_t *hwif = HWIF(drive);
 894         int max_sectors = 256;
 895         int max_sg_entries = PRD_ENTRIES;
 896
 897         /*
 898          *      Our default set up assumes the normal IDE case,
 899          *      that is 64K segmenting, standard PRD setup
 900          *      and LBA28. Some drivers then impose their own
 901          *      limits and LBA48 we could raise it but as yet
 902          *      do not.
 903          */
 904
 905         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
 906         if (!q)
 907                 return 1;
 908
 909         q->queuedata = drive;
 910         blk_queue_segment_boundary(q, 0xffff);
 911
 912         if (hwif->rqsize < max_sectors)
 913                 max_sectors = hwif->rqsize;
 914         blk_queue_max_sectors(q, max_sectors);
 915
 916 #ifdef CONFIG_PCI
 917         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 918          * creates segments that don't completely match our boundary
 919          * requirements and thus need to be broken up again. Because it
 920          * doesn't align properly either, we may actually have to break up
 921          * to more segments than what was we got in the first place, a max
 922          * worst case is twice as many.
 923          * This will be fixed once we teach pci_map_sg() about our boundary
 924          * requirements, hopefully soon. *FIXME*
 925          */
 926         if (!PCI_DMA_BUS_IS_PHYS)
 927                 max_sg_entries >>= 1;
 928 #endif /* CONFIG_PCI */
 929
 930         blk_queue_max_hw_segments(q, max_sg_entries);
 931         blk_queue_max_phys_segments(q, max_sg_entries);
 932
 933         /* assign drive queue */
 934         drive->queue = q;
 935
 936         /* needs drive->queue to be set */
 937         ide_toggle_bounce(drive, 1);
 938
 939         return 0;
 940 }
 941
 942 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
 943 {
 944         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
 945
 946         spin_lock_irq(&ide_lock);
 947         if (!hwgroup->drive) {
 948                 /* first drive for hwgroup. */
 949                 drive->next = drive;
 950                 hwgroup->drive = drive;
 951                 hwgroup->hwif = HWIF(hwgroup->drive);
 952         } else {
 953                 drive->next = hwgroup->drive->next;
 954                 hwgroup->drive->next = drive;
 955         }
 956         spin_unlock_irq(&ide_lock);
 957 }
 958
 959 /*
 960  * For any present drive:
 961  * - allocate the block device queue
 962  * - link drive into the hwgroup
 963  */
 964 static void ide_port_setup_devices(ide_hwif_t *hwif)
 965 {
 966         int i;
 967
 968         mutex_lock(&ide_cfg_mtx);
 969         for (i = 0; i < MAX_DRIVES; i++) {
 970                 ide_drive_t *drive = &hwif->drives[i];
 971
 972                 if (!drive->present)
 973                         continue;
 974
 975                 if (ide_init_queue(drive)) {
 976                         printk(KERN_ERR "ide: failed to init %s\n",
 977                                         drive->name);
 978                         continue;
 979                 }
 980
 981                 ide_add_drive_to_hwgroup(drive);
 982         }
 983         mutex_unlock(&ide_cfg_mtx);
 984 }
 985
 986 static ide_hwif_t *ide_ports[MAX_HWIFS];
 987
 988 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
 989 {
 990         ide_hwgroup_t *hwgroup = hwif->hwgroup;
 991
 992         ide_ports[hwif->index] = NULL;
 993
 994         spin_lock_irq(&ide_lock);
 995         /*
 996          * Remove us from the hwgroup, and free
 997          * the hwgroup if we were the only member
 998          */
 999         if (hwif->next == hwif) {
1000                 BUG_ON(hwgroup->hwif != hwif);
1001                 kfree(hwgroup);
1002         } else {
1003                 /* There is another interface in hwgroup.
1004                  * Unlink us, and set hwgroup->drive and ->hwif to
1005                  * something sane.
1006                  */
1007                 ide_hwif_t *g = hwgroup->hwif;
1008
1009                 while (g->next != hwif)
1010                         g = g->next;
1011                 g->next = hwif->next;
1012                 if (hwgroup->hwif == hwif) {
1013                         /* Chose a random hwif for hwgroup->hwif.
1014                          * It's guaranteed that there are no drives
1015                          * left in the hwgroup.
1016                          */
1017                         BUG_ON(hwgroup->drive != NULL);
1018                         hwgroup->hwif = g;
1019                 }
1020                 BUG_ON(hwgroup->hwif == hwif);
1021         }
1022         spin_unlock_irq(&ide_lock);
1023 }
1024
1025 /*
1026  * This routine sets up the irq for an ide interface, and creates a new
1027  * hwgroup for the irq/hwif if none was previously assigned.
1028  *
1029  * Much of the code is for correctly detecting/handling irq sharing
1030  * and irq serialization situations.  This is somewhat complex because
1031  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1032  */
1033 static int init_irq (ide_hwif_t *hwif)
1034 {
1035         struct ide_io_ports *io_ports = &hwif->io_ports;
1036         unsigned int index;
1037         ide_hwgroup_t *hwgroup;
1038         ide_hwif_t *match = NULL;
1039
1040
1041         BUG_ON(in_interrupt());
1042         BUG_ON(irqs_disabled());
1043         BUG_ON(hwif == NULL);
1044
1045         mutex_lock(&ide_cfg_mtx);
1046         hwif->hwgroup = NULL;
1047 #if MAX_HWIFS > 1
1048         /*
1049          * Group up with any other hwifs that share our irq(s).
1050          */
1051         for (index = 0; index < MAX_HWIFS; index++) {
1052                 ide_hwif_t *h = ide_ports[index];
1053
1054                 if (h && h->hwgroup) {  /* scan only initialized ports */
1055                         if (hwif->irq == h->irq) {
1056                                 hwif->sharing_irq = h->sharing_irq = 1;
1057                                 if (hwif->chipset != ide_pci ||
1058                                     h->chipset != ide_pci) {
1059                                         save_match(hwif, h, &match);
1060                                 }
1061                         }
1062                         if (hwif->serialized) {
1063                                 if (hwif->mate && hwif->mate->irq == h->irq)
1064                                         save_match(hwif, h, &match);
1065                         }
1066                         if (h->serialized) {
1067                                 if (h->mate && hwif->irq == h->mate->irq)
1068                                         save_match(hwif, h, &match);
1069                         }
1070                 }
1071         }
1072 #endif /* MAX_HWIFS > 1 */
1073         /*
1074          * If we are still without a hwgroup, then form a new one
1075          */
1076         if (match) {
1077                 hwgroup = match->hwgroup;
1078                 hwif->hwgroup = hwgroup;
1079                 /*
1080                  * Link us into the hwgroup.
1081                  * This must be done early, do ensure that unexpected_intr
1082                  * can find the hwif and prevent irq storms.
1083                  * No drives are attached to the new hwif, choose_drive
1084                  * can't do anything stupid (yet).
1085                  * Add ourself as the 2nd entry to the hwgroup->hwif
1086                  * linked list, the first entry is the hwif that owns
1087                  * hwgroup->handler - do not change that.
1088                  */
1089                 spin_lock_irq(&ide_lock);
1090                 hwif->next = hwgroup->hwif->next;
1091                 hwgroup->hwif->next = hwif;
1092                 BUG_ON(hwif->next == hwif);
1093                 spin_unlock_irq(&ide_lock);
1094         } else {
1095                 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1096                                        hwif_to_node(hwif));
1097                 if (hwgroup == NULL)
1098                         goto out_up;
1099
1100                 hwif->hwgroup = hwgroup;
1101                 hwgroup->hwif = hwif->next = hwif;
1102
1103                 init_timer(&hwgroup->timer);
1104                 hwgroup->timer.function = &ide_timer_expiry;
1105                 hwgroup->timer.data = (unsigned long) hwgroup;
1106         }
1107
1108         ide_ports[hwif->index] = hwif;
1109
1110         /*
1111          * Allocate the irq, if not already obtained for another hwif
1112          */
1113         if (!match || match->irq != hwif->irq) {
1114                 int sa = 0;
1115 #if defined(__mc68000__)
1116                 sa = IRQF_SHARED;
1117 #endif /* __mc68000__ */
1118
1119                 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1120                         sa = IRQF_SHARED;
1121
1122                 if (io_ports->ctl_addr)
1123                         hwif->tp_ops->set_irq(hwif, 1);
1124
1125                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1126                         goto out_unlink;
1127         }
1128
1129         if (!hwif->rqsize) {
1130                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1131                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1132                         hwif->rqsize = 256;
1133                 else
1134                         hwif->rqsize = 65536;
1135         }
1136
1137 #if !defined(__mc68000__)
1138         printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1139                 io_ports->data_addr, io_ports->status_addr,
1140                 io_ports->ctl_addr, hwif->irq);
1141 #else
1142         printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
1143                 io_ports->data_addr, hwif->irq);
1144 #endif /* __mc68000__ */
1145         if (match)
1146                 printk(KERN_CONT " (%sed with %s)",
1147                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1148         printk(KERN_CONT "\n");
1149
1150         mutex_unlock(&ide_cfg_mtx);
1151         return 0;
1152 out_unlink:
1153         ide_remove_port_from_hwgroup(hwif);
1154 out_up:
1155         mutex_unlock(&ide_cfg_mtx);
1156         return 1;
1157 }
1158
1159 static int ata_lock(dev_t dev, void *data)
1160 {
1161         /* FIXME: we want to pin hwif down */
1162         return 0;
1163 }
1164
1165 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1166 {
1167         ide_hwif_t *hwif = data;
1168         int unit = *part >> PARTN_BITS;
1169         ide_drive_t *drive = &hwif->drives[unit];
1170         if (!drive->present)
1171                 return NULL;
1172
1173         if (drive->media == ide_disk)
1174                 request_module("ide-disk");
1175         if (drive->scsi)
1176                 request_module("ide-scsi");
1177         if (drive->media == ide_cdrom || drive->media == ide_optical)
1178                 request_module("ide-cd");
1179         if (drive->media == ide_tape)
1180                 request_module("ide-tape");
1181         if (drive->media == ide_floppy)
1182                 request_module("ide-floppy");
1183
1184         return NULL;
1185 }
1186
1187 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1188 {
1189         struct gendisk *p = data;
1190         *part &= (1 << PARTN_BITS) - 1;
1191         return &p->dev.kobj;
1192 }
1193
1194 static int exact_lock(dev_t dev, void *data)
1195 {
1196         struct gendisk *p = data;
1197
1198         if (!get_disk(p))
1199                 return -1;
1200         return 0;
1201 }
1202
1203 void ide_register_region(struct gendisk *disk)
1204 {
1205         blk_register_region(MKDEV(disk->major, disk->first_minor),
1206                             disk->minors, NULL, exact_match, exact_lock, disk);
1207 }
1208
1209 EXPORT_SYMBOL_GPL(ide_register_region);
1210
1211 void ide_unregister_region(struct gendisk *disk)
1212 {
1213         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1214                               disk->minors);
1215 }
1216
1217 EXPORT_SYMBOL_GPL(ide_unregister_region);
1218
1219 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1220 {
1221         ide_hwif_t *hwif = drive->hwif;
1222         unsigned int unit = (drive->select.all >> 4) & 1;
1223
1224         disk->major = hwif->major;
1225         disk->first_minor = unit << PARTN_BITS;
1226         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1227         disk->queue = drive->queue;
1228 }
1229
1230 EXPORT_SYMBOL_GPL(ide_init_disk);
1231
1232 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1233 {
1234         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1235
1236         if (drive == drive->next) {
1237                 /* special case: last drive from hwgroup. */
1238                 BUG_ON(hwgroup->drive != drive);
1239                 hwgroup->drive = NULL;
1240         } else {
1241                 ide_drive_t *walk;
1242
1243                 walk = hwgroup->drive;
1244                 while (walk->next != drive)
1245                         walk = walk->next;
1246                 walk->next = drive->next;
1247                 if (hwgroup->drive == drive) {
1248                         hwgroup->drive = drive->next;
1249                         hwgroup->hwif = hwgroup->drive->hwif;
1250                 }
1251         }
1252         BUG_ON(hwgroup->drive == drive);
1253 }
1254
1255 static void drive_release_dev (struct device *dev)
1256 {
1257         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1258
1259         ide_proc_unregister_device(drive);
1260
1261         spin_lock_irq(&ide_lock);
1262         ide_remove_drive_from_hwgroup(drive);
1263         kfree(drive->id);
1264         drive->id = NULL;
1265         drive->present = 0;
1266         /* Messed up locking ... */
1267         spin_unlock_irq(&ide_lock);
1268         blk_cleanup_queue(drive->queue);
1269         spin_lock_irq(&ide_lock);
1270         drive->queue = NULL;
1271         spin_unlock_irq(&ide_lock);
1272
1273         complete(&drive->gendev_rel_comp);
1274 }
1275
1276 static int hwif_init(ide_hwif_t *hwif)
1277 {
1278         int old_irq;
1279
1280         if (!hwif->irq) {
1281                 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1282                 if (!hwif->irq) {
1283                         printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
1284                         return 0;
1285                 }
1286         }
1287
1288         if (register_blkdev(hwif->major, hwif->name))
1289                 return 0;
1290
1291         if (!hwif->sg_max_nents)
1292                 hwif->sg_max_nents = PRD_ENTRIES;
1293
1294         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1295                                  GFP_KERNEL);
1296         if (!hwif->sg_table) {
1297                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1298                 goto out;
1299         }
1300
1301         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1302
1303         if (init_irq(hwif) == 0)
1304                 goto done;
1305
1306         old_irq = hwif->irq;
1307         /*
1308          *      It failed to initialise. Find the default IRQ for
1309          *      this port and try that.
1310          */
1311         hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1312         if (!hwif->irq) {
1313                 printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
1314                         hwif->name, old_irq);
1315                 goto out;
1316         }
1317         if (init_irq(hwif)) {
1318                 printk(KERN_ERR "%s: probed IRQ %d and default IRQ %d failed\n",
1319                         hwif->name, old_irq, hwif->irq);
1320                 goto out;
1321         }
1322         printk(KERN_WARNING "%s: probed IRQ %d failed, using default\n",
1323                 hwif->name, hwif->irq);
1324
1325 done:
1326         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1327                             THIS_MODULE, ata_probe, ata_lock, hwif);
1328         return 1;
1329
1330 out:
1331         unregister_blkdev(hwif->major, hwif->name);
1332         return 0;
1333 }
1334
1335 static void hwif_register_devices(ide_hwif_t *hwif)
1336 {
1337         unsigned int i;
1338
1339         for (i = 0; i < MAX_DRIVES; i++) {
1340                 ide_drive_t *drive = &hwif->drives[i];
1341                 struct device *dev = &drive->gendev;
1342                 int ret;
1343
1344                 if (!drive->present)
1345                         continue;
1346
1347                 ide_add_generic_settings(drive);
1348
1349                 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1350                 dev->parent = &hwif->gendev;
1351                 dev->bus = &ide_bus_type;
1352                 dev->driver_data = drive;
1353                 dev->release = drive_release_dev;
1354
1355                 ret = device_register(dev);
1356                 if (ret < 0)
1357                         printk(KERN_WARNING "IDE: %s: device_register error: "
1358                                             "%d\n", __func__, ret);
1359         }
1360 }
1361
1362 static void ide_port_init_devices(ide_hwif_t *hwif)
1363 {
1364         const struct ide_port_ops *port_ops = hwif->port_ops;
1365         int i;
1366
1367         for (i = 0; i < MAX_DRIVES; i++) {
1368                 ide_drive_t *drive = &hwif->drives[i];
1369
1370                 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1371                         drive->io_32bit = 1;
1372                 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1373                         drive->unmask = 1;
1374                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1375                         drive->no_unmask = 1;
1376
1377                 if (port_ops && port_ops->init_dev)
1378                         port_ops->init_dev(drive);
1379         }
1380 }
1381
1382 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1383                           const struct ide_port_info *d)
1384 {
1385         hwif->channel = port;
1386
1387         if (d->chipset)
1388                 hwif->chipset = d->chipset;
1389
1390         if (d->init_iops)
1391                 d->init_iops(hwif);
1392
1393         if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1394             (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1395                 hwif->irq = port ? 15 : 14;
1396
1397         /* ->host_flags may be set by ->init_iops (or even earlier...) */
1398         hwif->host_flags |= d->host_flags;
1399         hwif->pio_mask = d->pio_mask;
1400
1401         if (d->tp_ops)
1402                 hwif->tp_ops = d->tp_ops;
1403
1404         /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1405         if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1406                 hwif->port_ops = d->port_ops;
1407
1408         hwif->swdma_mask = d->swdma_mask;
1409         hwif->mwdma_mask = d->mwdma_mask;
1410         hwif->ultra_mask = d->udma_mask;
1411
1412         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1413                 int rc;
1414
1415                 if (d->init_dma)
1416                         rc = d->init_dma(hwif, d);
1417                 else
1418                         rc = ide_hwif_setup_dma(hwif, d);
1419
1420                 if (rc < 0) {
1421                         printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1422                         hwif->dma_base = 0;
1423                         hwif->swdma_mask = 0;
1424                         hwif->mwdma_mask = 0;
1425                         hwif->ultra_mask = 0;
1426                 } else if (d->dma_ops)
1427                         hwif->dma_ops = d->dma_ops;
1428         }
1429
1430         if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1431             ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1432                 if (hwif->mate)
1433                         hwif->mate->serialized = hwif->serialized = 1;
1434         }
1435
1436         if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1437                 hwif->rqsize = 256;
1438
1439         /* call chipset specific routine for each enabled port */
1440         if (d->init_hwif)
1441                 d->init_hwif(hwif);
1442 }
1443
1444 static void ide_port_cable_detect(ide_hwif_t *hwif)
1445 {
1446         const struct ide_port_ops *port_ops = hwif->port_ops;
1447
1448         if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1449                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1450                         hwif->cbl = port_ops->cable_detect(hwif);
1451         }
1452 }
1453
1454 static ssize_t store_delete_devices(struct device *portdev,
1455                                     struct device_attribute *attr,
1456                                     const char *buf, size_t n)
1457 {
1458         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1459
1460         if (strncmp(buf, "1", n))
1461                 return -EINVAL;
1462
1463         ide_port_unregister_devices(hwif);
1464
1465         return n;
1466 };
1467
1468 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1469
1470 static ssize_t store_scan(struct device *portdev,
1471                           struct device_attribute *attr,
1472                           const char *buf, size_t n)
1473 {
1474         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1475
1476         if (strncmp(buf, "1", n))
1477                 return -EINVAL;
1478
1479         ide_port_unregister_devices(hwif);
1480         ide_port_scan(hwif);
1481
1482         return n;
1483 };
1484
1485 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1486
1487 static struct device_attribute *ide_port_attrs[] = {
1488         &dev_attr_delete_devices,
1489         &dev_attr_scan,
1490         NULL
1491 };
1492
1493 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1494 {
1495         int i, rc;
1496
1497         for (i = 0; ide_port_attrs[i]; i++) {
1498                 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1499                 if (rc)
1500                         break;
1501         }
1502
1503         return rc;
1504 }
1505
1506 static unsigned int ide_indexes;
1507
1508 /**
1509  *      ide_find_port_slot      -       find free port slot
1510  *      @d: IDE port info
1511  *
1512  *      Return the new port slot index or -ENOENT if we are out of free slots.
1513  */
1514
1515 static int ide_find_port_slot(const struct ide_port_info *d)
1516 {
1517         int idx = -ENOENT;
1518         u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1519         u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
1520
1521         /*
1522          * Claim an unassigned slot.
1523          *
1524          * Give preference to claiming other slots before claiming ide0/ide1,
1525          * just in case there's another interface yet-to-be-scanned
1526          * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1527          *
1528          * Unless there is a bootable card that does not use the standard
1529          * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1530          */
1531         mutex_lock(&ide_cfg_mtx);
1532         if (MAX_HWIFS == 1) {
1533                 if (ide_indexes == 0 && i == 0)
1534                         idx = 1;
1535         } else {
1536                 if (bootable) {
1537                         if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1538                                 idx = ffz(ide_indexes | i);
1539                 } else {
1540                         if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1541                                 idx = ffz(ide_indexes | 3);
1542                         else if ((ide_indexes & 3) != 3)
1543                                 idx = ffz(ide_indexes);
1544                 }
1545         }
1546         if (idx >= 0)
1547                 ide_indexes |= (1 << idx);
1548         mutex_unlock(&ide_cfg_mtx);
1549
1550         return idx;
1551 }
1552
1553 static void ide_free_port_slot(int idx)
1554 {
1555         mutex_lock(&ide_cfg_mtx);
1556         ide_indexes &= ~(1 << idx);
1557         mutex_unlock(&ide_cfg_mtx);
1558 }
1559
1560 struct ide_host *ide_host_alloc_all(const struct ide_port_info *d,
1561                                     hw_regs_t **hws)
1562 {
1563         struct ide_host *host;
1564         int i;
1565
1566         host = kzalloc(sizeof(*host), GFP_KERNEL);
1567         if (host == NULL)
1568                 return NULL;
1569
1570         for (i = 0; i < MAX_HWIFS; i++) {
1571                 ide_hwif_t *hwif;
1572                 int idx;
1573
1574                 if (hws[i] == NULL)
1575                         continue;
1576
1577                 hwif = kzalloc(sizeof(*hwif), GFP_KERNEL);
1578                 if (hwif == NULL)
1579                         continue;
1580
1581                 idx = ide_find_port_slot(d);
1582                 if (idx < 0) {
1583                         printk(KERN_ERR "%s: no free slot for interface\n",
1584                                         d ? d->name : "ide");
1585                         kfree(hwif);
1586                         continue;
1587                 }
1588
1589                 ide_init_port_data(hwif, idx);
1590
1591                 hwif->host = host;
1592
1593                 host->ports[i] = hwif;
1594                 host->n_ports++;
1595         }
1596
1597         if (host->n_ports == 0) {
1598                 kfree(host);
1599                 return NULL;
1600         }
1601
1602         if (hws[0])
1603                 host->dev[0] = hws[0]->dev;
1604
1605         if (d)
1606                 host->host_flags = d->host_flags;
1607
1608         return host;
1609 }
1610 EXPORT_SYMBOL_GPL(ide_host_alloc_all);
1611
1612 struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
1613 {
1614         hw_regs_t *hws_all[MAX_HWIFS];
1615         int i;
1616
1617         for (i = 0; i < MAX_HWIFS; i++)
1618                 hws_all[i] = (i < 4) ? hws[i] : NULL;
1619
1620         return ide_host_alloc_all(d, hws_all);
1621 }
1622 EXPORT_SYMBOL_GPL(ide_host_alloc);
1623
1624 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1625                       hw_regs_t **hws)
1626 {
1627         ide_hwif_t *hwif, *mate = NULL;
1628         int i, j = 0;
1629
1630         for (i = 0; i < MAX_HWIFS; i++) {
1631                 hwif = host->ports[i];
1632
1633                 if (hwif == NULL) {
1634                         mate = NULL;
1635                         continue;
1636                 }
1637
1638                 ide_init_port_hw(hwif, hws[i]);
1639                 ide_port_apply_params(hwif);
1640
1641                 if (d == NULL) {
1642                         mate = NULL;
1643                         continue;
1644                 }
1645
1646                 if ((i & 1) && mate) {
1647                         hwif->mate = mate;
1648                         mate->mate = hwif;
1649                 }
1650
1651                 mate = (i & 1) ? NULL : hwif;
1652
1653                 ide_init_port(hwif, i & 1, d);
1654                 ide_port_cable_detect(hwif);
1655                 ide_port_init_devices(hwif);
1656         }
1657
1658         for (i = 0; i < MAX_HWIFS; i++) {
1659                 hwif = host->ports[i];
1660
1661                 if (hwif == NULL)
1662                         continue;
1663
1664                 if (ide_probe_port(hwif) == 0)
1665                         hwif->present = 1;
1666
1667                 if (hwif->chipset != ide_4drives || !hwif->mate ||
1668                     !hwif->mate->present)
1669                         ide_register_port(hwif);
1670
1671                 if (hwif->present)
1672                         ide_port_tune_devices(hwif);
1673         }
1674
1675         for (i = 0; i < MAX_HWIFS; i++) {
1676                 hwif = host->ports[i];
1677
1678                 if (hwif == NULL)
1679                         continue;
1680
1681                 if (hwif_init(hwif) == 0) {
1682                         printk(KERN_INFO "%s: failed to initialize IDE "
1683                                          "interface\n", hwif->name);
1684                         hwif->present = 0;
1685                         continue;
1686                 }
1687
1688                 j++;
1689
1690                 if (hwif->present)
1691                         ide_port_setup_devices(hwif);
1692
1693                 ide_acpi_init(hwif);
1694
1695                 if (hwif->present)
1696                         ide_acpi_port_init_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                 if (hwif->chipset == ide_unknown)
1706                         hwif->chipset = ide_generic;
1707
1708                 if (hwif->present)
1709                         hwif_register_devices(hwif);
1710         }
1711
1712         for (i = 0; i < MAX_HWIFS; i++) {
1713                 hwif = host->ports[i];
1714
1715                 if (hwif == NULL)
1716                         continue;
1717
1718                 ide_sysfs_register_port(hwif);
1719                 ide_proc_register_port(hwif);
1720
1721                 if (hwif->present)
1722                         ide_proc_port_register_devices(hwif);
1723         }
1724
1725         return j ? 0 : -1;
1726 }
1727 EXPORT_SYMBOL_GPL(ide_host_register);
1728
1729 int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
1730                  struct ide_host **hostp)
1731 {
1732         struct ide_host *host;
1733         int rc;
1734
1735         host = ide_host_alloc(d, hws);
1736         if (host == NULL)
1737                 return -ENOMEM;
1738
1739         rc = ide_host_register(host, d, hws);
1740         if (rc) {
1741                 ide_host_free(host);
1742                 return rc;
1743         }
1744
1745         if (hostp)
1746                 *hostp = host;
1747
1748         return 0;
1749 }
1750 EXPORT_SYMBOL_GPL(ide_host_add);
1751
1752 void ide_host_free(struct ide_host *host)
1753 {
1754         ide_hwif_t *hwif;
1755         int i;
1756
1757         for (i = 0; i < MAX_HWIFS; i++) {
1758                 hwif = host->ports[i];
1759
1760                 if (hwif == NULL)
1761                         continue;
1762
1763                 ide_free_port_slot(hwif->index);
1764                 kfree(hwif);
1765         }
1766
1767         kfree(host);
1768 }
1769 EXPORT_SYMBOL_GPL(ide_host_free);
1770
1771 void ide_host_remove(struct ide_host *host)
1772 {
1773         int i;
1774
1775         for (i = 0; i < MAX_HWIFS; i++) {
1776                 if (host->ports[i])
1777                         ide_unregister(host->ports[i]);
1778         }
1779
1780         ide_host_free(host);
1781 }
1782 EXPORT_SYMBOL_GPL(ide_host_remove);
1783
1784 void ide_port_scan(ide_hwif_t *hwif)
1785 {
1786         ide_port_apply_params(hwif);
1787         ide_port_cable_detect(hwif);
1788         ide_port_init_devices(hwif);
1789
1790         if (ide_probe_port(hwif) < 0)
1791                 return;
1792
1793         hwif->present = 1;
1794
1795         ide_port_tune_devices(hwif);
1796         ide_acpi_port_init_devices(hwif);
1797         ide_port_setup_devices(hwif);
1798         hwif_register_devices(hwif);
1799         ide_proc_port_register_devices(hwif);
1800 }
1801 EXPORT_SYMBOL_GPL(ide_port_scan);
1802
1803 static void ide_legacy_init_one(hw_regs_t **hws, hw_regs_t *hw,
1804                                 u8 port_no, const struct ide_port_info *d,
1805                                 unsigned long config)
1806 {
1807         unsigned long base, ctl;
1808         int irq;
1809
1810         if (port_no == 0) {
1811                 base = 0x1f0;
1812                 ctl  = 0x3f6;
1813                 irq  = 14;
1814         } else {
1815                 base = 0x170;
1816                 ctl  = 0x376;
1817                 irq  = 15;
1818         }
1819
1820         if (!request_region(base, 8, d->name)) {
1821                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1822                                 d->name, base, base + 7);
1823                 return;
1824         }
1825
1826         if (!request_region(ctl, 1, d->name)) {
1827                 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1828                                 d->name, ctl);
1829                 release_region(base, 8);
1830                 return;
1831         }
1832
1833         ide_std_init_ports(hw, base, ctl);
1834         hw->irq = irq;
1835         hw->chipset = d->chipset;
1836         hw->config = config;
1837
1838         hws[port_no] = hw;
1839 }
1840
1841 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
1842 {
1843         hw_regs_t hw[2], *hws[] = { NULL, NULL, NULL, NULL };
1844
1845         memset(&hw, 0, sizeof(hw));
1846
1847         if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
1848                 ide_legacy_init_one(hws, &hw[0], 0, d, config);
1849         ide_legacy_init_one(hws, &hw[1], 1, d, config);
1850
1851         if (hws[0] == NULL && hws[1] == NULL &&
1852             (d->host_flags & IDE_HFLAG_SINGLE))
1853                 return -ENOENT;
1854
1855         return ide_host_add(d, hws, NULL);
1856 }
1857 EXPORT_SYMBOL_GPL(ide_legacy_device_add);