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         if (id->max_multsect) {
  93 #ifdef CONFIG_IDEDISK_MULTI_MODE
  94                 if ((id->max_multsect / 2) > 1) {
  95                         id->multsect = id->max_multsect;
  96                         id->multsect_valid = 1;
  97                 } else {
  98                         id->multsect = 0;
  99                         id->multsect_valid = 0;
 100                 }
 101                 drive->mult_req = id->multsect;
 102 #endif
 103                 if ((id->multsect_valid & 1) && id->multsect)
 104                         drive->special.b.set_multmode = 1;
 105         }
 106 }
 107
 108 /**
 109  *      do_identify     -       identify a drive
 110  *      @drive: drive to identify
 111  *      @cmd: command used
 112  *
 113  *      Called when we have issued a drive identify command to
 114  *      read and parse the results. This function is run with
 115  *      interrupts disabled.
 116  */
 117
 118 static inline void do_identify (ide_drive_t *drive, u8 cmd)
 119 {
 120         ide_hwif_t *hwif = HWIF(drive);
 121         int bswap = 1;
 122         struct hd_driveid *id;
 123
 124         id = drive->id;
 125         /* read 512 bytes of id info */
 126         hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
 127
 128         drive->id_read = 1;
 129         local_irq_enable();
 130 #ifdef DEBUG
 131         printk(KERN_INFO "%s: dumping identify data\n", drive->name);
 132         ide_dump_identify((u8 *)id);
 133 #endif
 134         ide_fix_driveid(id);
 135
 136         /*
 137          *  WIN_IDENTIFY returns little-endian info,
 138          *  WIN_PIDENTIFY *usually* returns little-endian info.
 139          */
 140         if (cmd == WIN_PIDENTIFY) {
 141                 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
 142                  || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
 143                  || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
 144                         /* Vertos drives may still be weird */
 145                         bswap ^= 1;
 146         }
 147         ide_fixstring(id->model,     sizeof(id->model),     bswap);
 148         ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
 149         ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
 150
 151         /* we depend on this a lot! */
 152         id->model[sizeof(id->model)-1] = '\0';
 153
 154         if (strstr(id->model, "E X A B Y T E N E S T"))
 155                 goto err_misc;
 156
 157         printk(KERN_INFO "%s: %s, ", drive->name, id->model);
 158
 159         drive->present = 1;
 160         drive->dead = 0;
 161
 162         /*
 163          * Check for an ATAPI device
 164          */
 165         if (cmd == WIN_PIDENTIFY) {
 166                 u8 type = (id->config >> 8) & 0x1f;
 167
 168                 printk(KERN_CONT "ATAPI ");
 169                 switch (type) {
 170                         case ide_floppy:
 171                                 if (!strstr(id->model, "CD-ROM")) {
 172                                         if (!strstr(id->model, "oppy") &&
 173                                             !strstr(id->model, "poyp") &&
 174                                             !strstr(id->model, "ZIP"))
 175                                                 printk(KERN_CONT "cdrom or floppy?, assuming ");
 176                                         if (drive->media != ide_cdrom) {
 177                                                 printk(KERN_CONT "FLOPPY");
 178                                                 drive->removable = 1;
 179                                                 break;
 180                                         }
 181                                 }
 182                                 /* Early cdrom models used zero */
 183                                 type = ide_cdrom;
 184                         case ide_cdrom:
 185                                 drive->removable = 1;
 186 #ifdef CONFIG_PPC
 187                                 /* kludge for Apple PowerBook internal zip */
 188                                 if (!strstr(id->model, "CD-ROM") &&
 189                                     strstr(id->model, "ZIP")) {
 190                                         printk(KERN_CONT "FLOPPY");
 191                                         type = ide_floppy;
 192                                         break;
 193                                 }
 194 #endif
 195                                 printk(KERN_CONT "CD/DVD-ROM");
 196                                 break;
 197                         case ide_tape:
 198                                 printk(KERN_CONT "TAPE");
 199                                 break;
 200                         case ide_optical:
 201                                 printk(KERN_CONT "OPTICAL");
 202                                 drive->removable = 1;
 203                                 break;
 204                         default:
 205                                 printk(KERN_CONT "UNKNOWN (type %d)", type);
 206                                 break;
 207                 }
 208                 printk(KERN_CONT " drive\n");
 209                 drive->media = type;
 210                 /* an ATAPI device ignores DRDY */
 211                 drive->ready_stat = 0;
 212                 return;
 213         }
 214
 215         /*
 216          * Not an ATAPI device: looks like a "regular" hard disk
 217          */
 218
 219         /*
 220          * 0x848a = CompactFlash device
 221          * These are *not* removable in Linux definition of the term
 222          */
 223
 224         if ((id->config != 0x848a) && (id->config & (1<<7)))
 225                 drive->removable = 1;
 226
 227         drive->media = ide_disk;
 228
 229         printk(KERN_CONT "%s DISK drive\n",
 230                 (id->config == 0x848a) ? "CFA" : "ATA");
 231
 232         return;
 233
 234 err_misc:
 235         kfree(id);
 236         drive->present = 0;
 237         return;
 238 }
 239
 240 /**
 241  *      actual_try_to_identify  -       send ata/atapi identify
 242  *      @drive: drive to identify
 243  *      @cmd: command to use
 244  *
 245  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 246  *      and waits for a response.  It also monitors irqs while this is
 247  *      happening, in hope of automatically determining which one is
 248  *      being used by the interface.
 249  *
 250  *      Returns:        0  device was identified
 251  *                      1  device timed-out (no response to identify request)
 252  *                      2  device aborted the command (refused to identify itself)
 253  */
 254
 255 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 256 {
 257         ide_hwif_t *hwif = HWIF(drive);
 258         struct ide_io_ports *io_ports = &hwif->io_ports;
 259         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 260         int use_altstatus = 0, rc;
 261         unsigned long timeout;
 262         u8 s = 0, a = 0;
 263
 264         /* take a deep breath */
 265         msleep(50);
 266
 267         if (io_ports->ctl_addr) {
 268                 a = tp_ops->read_altstatus(hwif);
 269                 s = tp_ops->read_status(hwif);
 270                 if ((a ^ s) & ~INDEX_STAT)
 271                         /* ancient Seagate drives, broken interfaces */
 272                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
 273                                          "instead of ALTSTATUS(0x%02x)\n",
 274                                          drive->name, s, a);
 275                 else
 276                         /* use non-intrusive polling */
 277                         use_altstatus = 1;
 278         }
 279
 280         /* set features register for atapi
 281          * identify command to be sure of reply
 282          */
 283         if (cmd == WIN_PIDENTIFY) {
 284                 ide_task_t task;
 285
 286                 memset(&task, 0, sizeof(task));
 287                 /* disable DMA & overlap */
 288                 task.tf_flags = IDE_TFLAG_OUT_FEATURE;
 289
 290                 tp_ops->tf_load(drive, &task);
 291         }
 292
 293         /* ask drive for ID */
 294         tp_ops->exec_command(hwif, cmd);
 295
 296         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 297         timeout += jiffies;
 298         do {
 299                 if (time_after(jiffies, timeout)) {
 300                         /* drive timed-out */
 301                         return 1;
 302                 }
 303                 /* give drive a breather */
 304                 msleep(50);
 305                 s = use_altstatus ? tp_ops->read_altstatus(hwif)
 306                                   : tp_ops->read_status(hwif);
 307         } while (s & BUSY_STAT);
 308
 309         /* wait for IRQ and DRQ_STAT */
 310         msleep(50);
 311         s = tp_ops->read_status(hwif);
 312
 313         if (OK_STAT(s, DRQ_STAT, BAD_R_STAT)) {
 314                 unsigned long flags;
 315
 316                 /* local CPU only; some systems need this */
 317                 local_irq_save(flags);
 318                 /* drive returned ID */
 319                 do_identify(drive, cmd);
 320                 /* drive responded with ID */
 321                 rc = 0;
 322                 /* clear drive IRQ */
 323                 (void)tp_ops->read_status(hwif);
 324                 local_irq_restore(flags);
 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 static int ide_busy_sleep(ide_hwif_t *hwif)
 390 {
 391         unsigned long timeout = jiffies + WAIT_WORSTCASE;
 392         u8 stat;
 393
 394         do {
 395                 msleep(50);
 396                 stat = hwif->tp_ops->read_status(hwif);
 397                 if ((stat & BUSY_STAT) == 0)
 398                         return 0;
 399         } while (time_before(jiffies, timeout));
 400
 401         return 1;
 402 }
 403
 404 static u8 ide_read_device(ide_drive_t *drive)
 405 {
 406         ide_task_t task;
 407
 408         memset(&task, 0, sizeof(task));
 409         task.tf_flags = IDE_TFLAG_IN_DEVICE;
 410
 411         drive->hwif->tp_ops->tf_read(drive, &task);
 412
 413         return task.tf.device;
 414 }
 415
 416 /**
 417  *      do_probe                -       probe an IDE device
 418  *      @drive: drive to probe
 419  *      @cmd: command to use
 420  *
 421  *      do_probe() has the difficult job of finding a drive if it exists,
 422  *      without getting hung up if it doesn't exist, without trampling on
 423  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 424  *
 425  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 426  *      but does not respond right away, the probe will "hang in there"
 427  *      for the maximum wait time (about 30 seconds), otherwise it will
 428  *      exit much more quickly.
 429  *
 430  * Returns:     0  device was identified
 431  *              1  device timed-out (no response to identify request)
 432  *              2  device aborted the command (refused to identify itself)
 433  *              3  bad status from device (possible for ATAPI drives)
 434  *              4  probe was not attempted because failure was obvious
 435  */
 436
 437 static int do_probe (ide_drive_t *drive, u8 cmd)
 438 {
 439         ide_hwif_t *hwif = HWIF(drive);
 440         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 441         int rc;
 442         u8 stat;
 443
 444         if (drive->present) {
 445                 /* avoid waiting for inappropriate probes */
 446                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
 447                         return 4;
 448         }
 449 #ifdef DEBUG
 450         printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
 451                 drive->name, drive->present, drive->media,
 452                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
 453 #endif
 454
 455         /* needed for some systems
 456          * (e.g. crw9624 as drive0 with disk as slave)
 457          */
 458         msleep(50);
 459         SELECT_DRIVE(drive);
 460         msleep(50);
 461
 462         if (ide_read_device(drive) != drive->select.all && !drive->present) {
 463                 if (drive->select.b.unit != 0) {
 464                         /* exit with drive0 selected */
 465                         SELECT_DRIVE(&hwif->drives[0]);
 466                         /* allow BUSY_STAT to assert & clear */
 467                         msleep(50);
 468                 }
 469                 /* no i/f present: mmm.. this should be a 4 -ml */
 470                 return 3;
 471         }
 472
 473         stat = tp_ops->read_status(hwif);
 474
 475         if (OK_STAT(stat, READY_STAT, BUSY_STAT) ||
 476             drive->present || cmd == WIN_PIDENTIFY) {
 477                 /* send cmd and wait */
 478                 if ((rc = try_to_identify(drive, cmd))) {
 479                         /* failed: try again */
 480                         rc = try_to_identify(drive,cmd);
 481                 }
 482
 483                 stat = tp_ops->read_status(hwif);
 484
 485                 if (stat == (BUSY_STAT | READY_STAT))
 486                         return 4;
 487
 488                 if (rc == 1 && cmd == WIN_PIDENTIFY) {
 489                         printk(KERN_ERR "%s: no response (status = 0x%02x), "
 490                                         "resetting drive\n", drive->name, stat);
 491                         msleep(50);
 492                         SELECT_DRIVE(drive);
 493                         msleep(50);
 494                         tp_ops->exec_command(hwif, WIN_SRST);
 495                         (void)ide_busy_sleep(hwif);
 496                         rc = try_to_identify(drive, cmd);
 497                 }
 498
 499                 /* ensure drive IRQ is clear */
 500                 stat = tp_ops->read_status(hwif);
 501
 502                 if (rc == 1)
 503                         printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
 504                                         drive->name, stat);
 505         } else {
 506                 /* not present or maybe ATAPI */
 507                 rc = 3;
 508         }
 509         if (drive->select.b.unit != 0) {
 510                 /* exit with drive0 selected */
 511                 SELECT_DRIVE(&hwif->drives[0]);
 512                 msleep(50);
 513                 /* ensure drive irq is clear */
 514                 (void)tp_ops->read_status(hwif);
 515         }
 516         return rc;
 517 }
 518
 519 /*
 520  *
 521  */
 522 static void enable_nest (ide_drive_t *drive)
 523 {
 524         ide_hwif_t *hwif = HWIF(drive);
 525         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 526         u8 stat;
 527
 528         printk(KERN_INFO "%s: enabling %s -- ", hwif->name, drive->id->model);
 529
 530         SELECT_DRIVE(drive);
 531         msleep(50);
 532         tp_ops->exec_command(hwif, EXABYTE_ENABLE_NEST);
 533
 534         if (ide_busy_sleep(hwif)) {
 535                 printk(KERN_CONT "failed (timeout)\n");
 536                 return;
 537         }
 538
 539         msleep(50);
 540
 541         stat = tp_ops->read_status(hwif);
 542
 543         if (!OK_STAT(stat, 0, BAD_STAT))
 544                 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
 545         else
 546                 printk(KERN_CONT "success\n");
 547
 548         /* if !(success||timed-out) */
 549         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 550                 /* look for ATAPI device */
 551                 (void) do_probe(drive, WIN_PIDENTIFY);
 552         }
 553 }
 554
 555 /**
 556  *      probe_for_drives        -       upper level drive probe
 557  *      @drive: drive to probe for
 558  *
 559  *      probe_for_drive() tests for existence of a given drive using do_probe()
 560  *      and presents things to the user as needed.
 561  *
 562  *      Returns:        0  no device was found
 563  *                      1  device was found (note: drive->present might
 564  *                         still be 0)
 565  */
 566
 567 static inline u8 probe_for_drive (ide_drive_t *drive)
 568 {
 569         /*
 570          *      In order to keep things simple we have an id
 571          *      block for all drives at all times. If the device
 572          *      is pre ATA or refuses ATA/ATAPI identify we
 573          *      will add faked data to this.
 574          *
 575          *      Also note that 0 everywhere means "can't do X"
 576          */
 577
 578         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
 579         drive->id_read = 0;
 580         if(drive->id == NULL)
 581         {
 582                 printk(KERN_ERR "ide: out of memory for id data.\n");
 583                 return 0;
 584         }
 585         strcpy(drive->id->model, "UNKNOWN");
 586
 587         /* skip probing? */
 588         if (!drive->noprobe)
 589         {
 590                 /* if !(success||timed-out) */
 591                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 592                         /* look for ATAPI device */
 593                         (void) do_probe(drive, WIN_PIDENTIFY);
 594                 }
 595                 if (!drive->present)
 596                         /* drive not found */
 597                         return 0;
 598                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
 599                         enable_nest(drive);
 600
 601                 /* identification failed? */
 602                 if (!drive->id_read) {
 603                         if (drive->media == ide_disk) {
 604                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 605                                         drive->name, drive->cyl,
 606                                         drive->head, drive->sect);
 607                         } else if (drive->media == ide_cdrom) {
 608                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 609                         } else {
 610                                 /* nuke it */
 611                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 612                                 drive->present = 0;
 613                         }
 614                 }
 615                 /* drive was found */
 616         }
 617         if(!drive->present)
 618                 return 0;
 619         /* The drive wasn't being helpful. Add generic info only */
 620         if (drive->id_read == 0) {
 621                 generic_id(drive);
 622                 return 1;
 623         }
 624
 625         if (drive->media == ide_disk) {
 626                 ide_disk_init_chs(drive);
 627                 ide_disk_init_mult_count(drive);
 628         }
 629
 630         return drive->present;
 631 }
 632
 633 static void hwif_release_dev(struct device *dev)
 634 {
 635         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 636
 637         complete(&hwif->gendev_rel_comp);
 638 }
 639
 640 static int ide_register_port(ide_hwif_t *hwif)
 641 {
 642         int ret;
 643
 644         /* register with global device tree */
 645         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 646         hwif->gendev.driver_data = hwif;
 647         if (hwif->gendev.parent == NULL) {
 648                 if (hwif->dev)
 649                         hwif->gendev.parent = hwif->dev;
 650                 else
 651                         /* Would like to do = &device_legacy */
 652                         hwif->gendev.parent = NULL;
 653         }
 654         hwif->gendev.release = hwif_release_dev;
 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_drvdata(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->noprobe || drive->present) {
 722                         SELECT_DRIVE(drive);
 723                         hwif->tp_ops->set_irq(hwif, 1);
 724                         mdelay(2);
 725                         rc = ide_wait_not_busy(hwif, 35000);
 726                         if (rc)
 727                                 goto out;
 728                 } else
 729                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
 730                                           drive->name);
 731         }
 732 out:
 733         /* Exit function with master reselected (let's be sane) */
 734         if (unit)
 735                 SELECT_DRIVE(&hwif->drives[0]);
 736
 737         return rc;
 738 }
 739
 740 /**
 741  *      ide_undecoded_slave     -       look for bad CF adapters
 742  *      @drive1: drive
 743  *
 744  *      Analyse the drives on the interface and attempt to decide if we
 745  *      have the same drive viewed twice. This occurs with crap CF adapters
 746  *      and PCMCIA sometimes.
 747  */
 748
 749 void ide_undecoded_slave(ide_drive_t *drive1)
 750 {
 751         ide_drive_t *drive0 = &drive1->hwif->drives[0];
 752
 753         if ((drive1->dn & 1) == 0 || drive0->present == 0)
 754                 return;
 755
 756         /* If the models don't match they are not the same product */
 757         if (strcmp(drive0->id->model, drive1->id->model))
 758                 return;
 759
 760         /* Serial numbers do not match */
 761         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
 762                 return;
 763
 764         /* No serial number, thankfully very rare for CF */
 765         if (drive0->id->serial_no[0] == 0)
 766                 return;
 767
 768         /* Appears to be an IDE flash adapter with decode bugs */
 769         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 770
 771         drive1->present = 0;
 772 }
 773
 774 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 775
 776 static int ide_probe_port(ide_hwif_t *hwif)
 777 {
 778         unsigned long flags;
 779         unsigned int irqd;
 780         int unit, rc = -ENODEV;
 781
 782         BUG_ON(hwif->present);
 783
 784         if (hwif->drives[0].noprobe && hwif->drives[1].noprobe)
 785                 return -EACCES;
 786
 787         /*
 788          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 789          * we'll install our IRQ driver much later...
 790          */
 791         irqd = hwif->irq;
 792         if (irqd)
 793                 disable_irq(hwif->irq);
 794
 795         local_irq_set(flags);
 796
 797         if (ide_port_wait_ready(hwif) == -EBUSY)
 798                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 799
 800         /*
 801          * Second drive should only exist if first drive was found,
 802          * but a lot of cdrom drives are configured as single slaves.
 803          */
 804         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 805                 ide_drive_t *drive = &hwif->drives[unit];
 806                 drive->dn = (hwif->channel ? 2 : 0) + unit;
 807                 (void) probe_for_drive(drive);
 808                 if (drive->present)
 809                         rc = 0;
 810         }
 811
 812         local_irq_restore(flags);
 813
 814         /*
 815          * Use cached IRQ number. It might be (and is...) changed by probe
 816          * code above
 817          */
 818         if (irqd)
 819                 enable_irq(irqd);
 820
 821         return rc;
 822 }
 823
 824 static void ide_port_tune_devices(ide_hwif_t *hwif)
 825 {
 826         const struct ide_port_ops *port_ops = hwif->port_ops;
 827         int unit;
 828
 829         for (unit = 0; unit < MAX_DRIVES; unit++) {
 830                 ide_drive_t *drive = &hwif->drives[unit];
 831
 832                 if (drive->present && port_ops && port_ops->quirkproc)
 833                         port_ops->quirkproc(drive);
 834         }
 835
 836         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 837                 ide_drive_t *drive = &hwif->drives[unit];
 838
 839                 if (drive->present) {
 840                         ide_set_max_pio(drive);
 841
 842                         drive->nice1 = 1;
 843
 844                         if (hwif->dma_ops)
 845                                 ide_set_dma(drive);
 846                 }
 847         }
 848
 849         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 850                 ide_drive_t *drive = &hwif->drives[unit];
 851
 852                 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
 853                         drive->no_io_32bit = 1;
 854                 else
 855                         drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
 856         }
 857 }
 858
 859 #if MAX_HWIFS > 1
 860 /*
 861  * save_match() is used to simplify logic in init_irq() below.
 862  *
 863  * A loophole here is that we may not know about a particular
 864  * hwif's irq until after that hwif is actually probed/initialized..
 865  * This could be a problem for the case where an hwif is on a
 866  * dual interface that requires serialization (eg. cmd640) and another
 867  * hwif using one of the same irqs is initialized beforehand.
 868  *
 869  * This routine detects and reports such situations, but does not fix them.
 870  */
 871 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 872 {
 873         ide_hwif_t *m = *match;
 874
 875         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 876                 if (!new->hwgroup)
 877                         return;
 878                 printk(KERN_WARNING "%s: potential IRQ problem with %s and %s\n",
 879                         hwif->name, new->name, m->name);
 880         }
 881         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 882                 *match = new;
 883 }
 884 #endif /* MAX_HWIFS > 1 */
 885
 886 /*
 887  * init request queue
 888  */
 889 static int ide_init_queue(ide_drive_t *drive)
 890 {
 891         struct request_queue *q;
 892         ide_hwif_t *hwif = HWIF(drive);
 893         int max_sectors = 256;
 894         int max_sg_entries = PRD_ENTRIES;
 895
 896         /*
 897          *      Our default set up assumes the normal IDE case,
 898          *      that is 64K segmenting, standard PRD setup
 899          *      and LBA28. Some drivers then impose their own
 900          *      limits and LBA48 we could raise it but as yet
 901          *      do not.
 902          */
 903
 904         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
 905         if (!q)
 906                 return 1;
 907
 908         q->queuedata = drive;
 909         blk_queue_segment_boundary(q, 0xffff);
 910
 911         if (hwif->rqsize < max_sectors)
 912                 max_sectors = hwif->rqsize;
 913         blk_queue_max_sectors(q, max_sectors);
 914
 915 #ifdef CONFIG_PCI
 916         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 917          * creates segments that don't completely match our boundary
 918          * requirements and thus need to be broken up again. Because it
 919          * doesn't align properly either, we may actually have to break up
 920          * to more segments than what was we got in the first place, a max
 921          * worst case is twice as many.
 922          * This will be fixed once we teach pci_map_sg() about our boundary
 923          * requirements, hopefully soon. *FIXME*
 924          */
 925         if (!PCI_DMA_BUS_IS_PHYS)
 926                 max_sg_entries >>= 1;
 927 #endif /* CONFIG_PCI */
 928
 929         blk_queue_max_hw_segments(q, max_sg_entries);
 930         blk_queue_max_phys_segments(q, max_sg_entries);
 931
 932         /* assign drive queue */
 933         drive->queue = q;
 934
 935         /* needs drive->queue to be set */
 936         ide_toggle_bounce(drive, 1);
 937
 938         return 0;
 939 }
 940
 941 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
 942 {
 943         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
 944
 945         spin_lock_irq(&ide_lock);
 946         if (!hwgroup->drive) {
 947                 /* first drive for hwgroup. */
 948                 drive->next = drive;
 949                 hwgroup->drive = drive;
 950                 hwgroup->hwif = HWIF(hwgroup->drive);
 951         } else {
 952                 drive->next = hwgroup->drive->next;
 953                 hwgroup->drive->next = drive;
 954         }
 955         spin_unlock_irq(&ide_lock);
 956 }
 957
 958 /*
 959  * For any present drive:
 960  * - allocate the block device queue
 961  * - link drive into the hwgroup
 962  */
 963 static void ide_port_setup_devices(ide_hwif_t *hwif)
 964 {
 965         int i;
 966
 967         mutex_lock(&ide_cfg_mtx);
 968         for (i = 0; i < MAX_DRIVES; i++) {
 969                 ide_drive_t *drive = &hwif->drives[i];
 970
 971                 if (!drive->present)
 972                         continue;
 973
 974                 if (ide_init_queue(drive)) {
 975                         printk(KERN_ERR "ide: failed to init %s\n",
 976                                         drive->name);
 977                         continue;
 978                 }
 979
 980                 ide_add_drive_to_hwgroup(drive);
 981         }
 982         mutex_unlock(&ide_cfg_mtx);
 983 }
 984
 985 static ide_hwif_t *ide_ports[MAX_HWIFS];
 986
 987 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
 988 {
 989         ide_hwgroup_t *hwgroup = hwif->hwgroup;
 990
 991         ide_ports[hwif->index] = NULL;
 992
 993         spin_lock_irq(&ide_lock);
 994         /*
 995          * Remove us from the hwgroup, and free
 996          * the hwgroup if we were the only member
 997          */
 998         if (hwif->next == hwif) {
 999                 BUG_ON(hwgroup->hwif != hwif);
1000                 kfree(hwgroup);
1001         } else {
1002                 /* There is another interface in hwgroup.
1003                  * Unlink us, and set hwgroup->drive and ->hwif to
1004                  * something sane.
1005                  */
1006                 ide_hwif_t *g = hwgroup->hwif;
1007
1008                 while (g->next != hwif)
1009                         g = g->next;
1010                 g->next = hwif->next;
1011                 if (hwgroup->hwif == hwif) {
1012                         /* Chose a random hwif for hwgroup->hwif.
1013                          * It's guaranteed that there are no drives
1014                          * left in the hwgroup.
1015                          */
1016                         BUG_ON(hwgroup->drive != NULL);
1017                         hwgroup->hwif = g;
1018                 }
1019                 BUG_ON(hwgroup->hwif == hwif);
1020         }
1021         spin_unlock_irq(&ide_lock);
1022 }
1023
1024 /*
1025  * This routine sets up the irq for an ide interface, and creates a new
1026  * hwgroup for the irq/hwif if none was previously assigned.
1027  *
1028  * Much of the code is for correctly detecting/handling irq sharing
1029  * and irq serialization situations.  This is somewhat complex because
1030  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1031  */
1032 static int init_irq (ide_hwif_t *hwif)
1033 {
1034         struct ide_io_ports *io_ports = &hwif->io_ports;
1035         unsigned int index;
1036         ide_hwgroup_t *hwgroup;
1037         ide_hwif_t *match = NULL;
1038
1039
1040         BUG_ON(in_interrupt());
1041         BUG_ON(irqs_disabled());
1042         BUG_ON(hwif == NULL);
1043
1044         mutex_lock(&ide_cfg_mtx);
1045         hwif->hwgroup = NULL;
1046 #if MAX_HWIFS > 1
1047         /*
1048          * Group up with any other hwifs that share our irq(s).
1049          */
1050         for (index = 0; index < MAX_HWIFS; index++) {
1051                 ide_hwif_t *h = ide_ports[index];
1052
1053                 if (h && h->hwgroup) {  /* scan only initialized ports */
1054                         if (hwif->irq == h->irq) {
1055                                 hwif->sharing_irq = h->sharing_irq = 1;
1056                                 if (hwif->chipset != ide_pci ||
1057                                     h->chipset != ide_pci) {
1058                                         save_match(hwif, h, &match);
1059                                 }
1060                         }
1061                         if (hwif->serialized) {
1062                                 if (hwif->mate && hwif->mate->irq == h->irq)
1063                                         save_match(hwif, h, &match);
1064                         }
1065                         if (h->serialized) {
1066                                 if (h->mate && hwif->irq == h->mate->irq)
1067                                         save_match(hwif, h, &match);
1068                         }
1069                 }
1070         }
1071 #endif /* MAX_HWIFS > 1 */
1072         /*
1073          * If we are still without a hwgroup, then form a new one
1074          */
1075         if (match) {
1076                 hwgroup = match->hwgroup;
1077                 hwif->hwgroup = hwgroup;
1078                 /*
1079                  * Link us into the hwgroup.
1080                  * This must be done early, do ensure that unexpected_intr
1081                  * can find the hwif and prevent irq storms.
1082                  * No drives are attached to the new hwif, choose_drive
1083                  * can't do anything stupid (yet).
1084                  * Add ourself as the 2nd entry to the hwgroup->hwif
1085                  * linked list, the first entry is the hwif that owns
1086                  * hwgroup->handler - do not change that.
1087                  */
1088                 spin_lock_irq(&ide_lock);
1089                 hwif->next = hwgroup->hwif->next;
1090                 hwgroup->hwif->next = hwif;
1091                 BUG_ON(hwif->next == hwif);
1092                 spin_unlock_irq(&ide_lock);
1093         } else {
1094                 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1095                                        hwif_to_node(hwif));
1096                 if (hwgroup == NULL)
1097                         goto out_up;
1098
1099                 hwif->hwgroup = hwgroup;
1100                 hwgroup->hwif = hwif->next = hwif;
1101
1102                 init_timer(&hwgroup->timer);
1103                 hwgroup->timer.function = &ide_timer_expiry;
1104                 hwgroup->timer.data = (unsigned long) hwgroup;
1105         }
1106
1107         ide_ports[hwif->index] = hwif;
1108
1109         /*
1110          * Allocate the irq, if not already obtained for another hwif
1111          */
1112         if (!match || match->irq != hwif->irq) {
1113                 int sa = 0;
1114 #if defined(__mc68000__)
1115                 sa = IRQF_SHARED;
1116 #endif /* __mc68000__ */
1117
1118                 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1119                         sa = IRQF_SHARED;
1120
1121                 if (io_ports->ctl_addr)
1122                         hwif->tp_ops->set_irq(hwif, 1);
1123
1124                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1125                         goto out_unlink;
1126         }
1127
1128         if (!hwif->rqsize) {
1129                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1130                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1131                         hwif->rqsize = 256;
1132                 else
1133                         hwif->rqsize = 65536;
1134         }
1135
1136 #if !defined(__mc68000__)
1137         printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1138                 io_ports->data_addr, io_ports->status_addr,
1139                 io_ports->ctl_addr, hwif->irq);
1140 #else
1141         printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
1142                 io_ports->data_addr, hwif->irq);
1143 #endif /* __mc68000__ */
1144         if (match)
1145                 printk(KERN_CONT " (%sed with %s)",
1146                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1147         printk(KERN_CONT "\n");
1148
1149         mutex_unlock(&ide_cfg_mtx);
1150         return 0;
1151 out_unlink:
1152         ide_remove_port_from_hwgroup(hwif);
1153 out_up:
1154         mutex_unlock(&ide_cfg_mtx);
1155         return 1;
1156 }
1157
1158 static int ata_lock(dev_t dev, void *data)
1159 {
1160         /* FIXME: we want to pin hwif down */
1161         return 0;
1162 }
1163
1164 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1165 {
1166         ide_hwif_t *hwif = data;
1167         int unit = *part >> PARTN_BITS;
1168         ide_drive_t *drive = &hwif->drives[unit];
1169         if (!drive->present)
1170                 return NULL;
1171
1172         if (drive->media == ide_disk)
1173                 request_module("ide-disk");
1174         if (drive->scsi)
1175                 request_module("ide-scsi");
1176         if (drive->media == ide_cdrom || drive->media == ide_optical)
1177                 request_module("ide-cd");
1178         if (drive->media == ide_tape)
1179                 request_module("ide-tape");
1180         if (drive->media == ide_floppy)
1181                 request_module("ide-floppy");
1182
1183         return NULL;
1184 }
1185
1186 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1187 {
1188         struct gendisk *p = data;
1189         *part &= (1 << PARTN_BITS) - 1;
1190         return &disk_to_dev(p)->kobj;
1191 }
1192
1193 static int exact_lock(dev_t dev, void *data)
1194 {
1195         struct gendisk *p = data;
1196
1197         if (!get_disk(p))
1198                 return -1;
1199         return 0;
1200 }
1201
1202 void ide_register_region(struct gendisk *disk)
1203 {
1204         blk_register_region(MKDEV(disk->major, disk->first_minor),
1205                             disk->minors, NULL, exact_match, exact_lock, disk);
1206 }
1207
1208 EXPORT_SYMBOL_GPL(ide_register_region);
1209
1210 void ide_unregister_region(struct gendisk *disk)
1211 {
1212         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1213                               disk->minors);
1214 }
1215
1216 EXPORT_SYMBOL_GPL(ide_unregister_region);
1217
1218 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1219 {
1220         ide_hwif_t *hwif = drive->hwif;
1221         unsigned int unit = (drive->select.all >> 4) & 1;
1222
1223         disk->major = hwif->major;
1224         disk->first_minor = unit << PARTN_BITS;
1225         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1226         disk->queue = drive->queue;
1227 }
1228
1229 EXPORT_SYMBOL_GPL(ide_init_disk);
1230
1231 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1232 {
1233         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1234
1235         if (drive == drive->next) {
1236                 /* special case: last drive from hwgroup. */
1237                 BUG_ON(hwgroup->drive != drive);
1238                 hwgroup->drive = NULL;
1239         } else {
1240                 ide_drive_t *walk;
1241
1242                 walk = hwgroup->drive;
1243                 while (walk->next != drive)
1244                         walk = walk->next;
1245                 walk->next = drive->next;
1246                 if (hwgroup->drive == drive) {
1247                         hwgroup->drive = drive->next;
1248                         hwgroup->hwif = hwgroup->drive->hwif;
1249                 }
1250         }
1251         BUG_ON(hwgroup->drive == drive);
1252 }
1253
1254 static void drive_release_dev (struct device *dev)
1255 {
1256         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1257
1258         ide_proc_unregister_device(drive);
1259
1260         spin_lock_irq(&ide_lock);
1261         ide_remove_drive_from_hwgroup(drive);
1262         kfree(drive->id);
1263         drive->id = NULL;
1264         drive->present = 0;
1265         /* Messed up locking ... */
1266         spin_unlock_irq(&ide_lock);
1267         blk_cleanup_queue(drive->queue);
1268         spin_lock_irq(&ide_lock);
1269         drive->queue = NULL;
1270         spin_unlock_irq(&ide_lock);
1271
1272         complete(&drive->gendev_rel_comp);
1273 }
1274
1275 static int hwif_init(ide_hwif_t *hwif)
1276 {
1277         int old_irq;
1278
1279         if (!hwif->irq) {
1280                 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1281                 if (!hwif->irq) {
1282                         printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
1283                         return 0;
1284                 }
1285         }
1286
1287         if (register_blkdev(hwif->major, hwif->name))
1288                 return 0;
1289
1290         if (!hwif->sg_max_nents)
1291                 hwif->sg_max_nents = PRD_ENTRIES;
1292
1293         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1294                                  GFP_KERNEL);
1295         if (!hwif->sg_table) {
1296                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1297                 goto out;
1298         }
1299
1300         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1301
1302         if (init_irq(hwif) == 0)
1303                 goto done;
1304
1305         old_irq = hwif->irq;
1306         /*
1307          *      It failed to initialise. Find the default IRQ for
1308          *      this port and try that.
1309          */
1310         hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1311         if (!hwif->irq) {
1312                 printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
1313                         hwif->name, old_irq);
1314                 goto out;
1315         }
1316         if (init_irq(hwif)) {
1317                 printk(KERN_ERR "%s: probed IRQ %d and default IRQ %d failed\n",
1318                         hwif->name, old_irq, hwif->irq);
1319                 goto out;
1320         }
1321         printk(KERN_WARNING "%s: probed IRQ %d failed, using default\n",
1322                 hwif->name, hwif->irq);
1323
1324 done:
1325         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1326                             THIS_MODULE, ata_probe, ata_lock, hwif);
1327         return 1;
1328
1329 out:
1330         unregister_blkdev(hwif->major, hwif->name);
1331         return 0;
1332 }
1333
1334 static void hwif_register_devices(ide_hwif_t *hwif)
1335 {
1336         unsigned int i;
1337
1338         for (i = 0; i < MAX_DRIVES; i++) {
1339                 ide_drive_t *drive = &hwif->drives[i];
1340                 struct device *dev = &drive->gendev;
1341                 int ret;
1342
1343                 if (!drive->present)
1344                         continue;
1345
1346                 ide_add_generic_settings(drive);
1347
1348                 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1349                 dev->parent = &hwif->gendev;
1350                 dev->bus = &ide_bus_type;
1351                 dev->driver_data = drive;
1352                 dev->release = drive_release_dev;
1353
1354                 ret = device_register(dev);
1355                 if (ret < 0)
1356                         printk(KERN_WARNING "IDE: %s: device_register error: "
1357                                             "%d\n", __func__, ret);
1358         }
1359 }
1360
1361 static void ide_port_init_devices(ide_hwif_t *hwif)
1362 {
1363         const struct ide_port_ops *port_ops = hwif->port_ops;
1364         int i;
1365
1366         for (i = 0; i < MAX_DRIVES; i++) {
1367                 ide_drive_t *drive = &hwif->drives[i];
1368
1369                 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1370                         drive->io_32bit = 1;
1371                 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1372                         drive->unmask = 1;
1373                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1374                         drive->no_unmask = 1;
1375
1376                 if (port_ops && port_ops->init_dev)
1377                         port_ops->init_dev(drive);
1378         }
1379 }
1380
1381 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1382                           const struct ide_port_info *d)
1383 {
1384         hwif->channel = port;
1385
1386         if (d->chipset)
1387                 hwif->chipset = d->chipset;
1388
1389         if (d->init_iops)
1390                 d->init_iops(hwif);
1391
1392         if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1393             (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1394                 hwif->irq = port ? 15 : 14;
1395
1396         /* ->host_flags may be set by ->init_iops (or even earlier...) */
1397         hwif->host_flags |= d->host_flags;
1398         hwif->pio_mask = d->pio_mask;
1399
1400         if (d->tp_ops)
1401                 hwif->tp_ops = d->tp_ops;
1402
1403         /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1404         if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1405                 hwif->port_ops = d->port_ops;
1406
1407         hwif->swdma_mask = d->swdma_mask;
1408         hwif->mwdma_mask = d->mwdma_mask;
1409         hwif->ultra_mask = d->udma_mask;
1410
1411         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1412                 int rc;
1413
1414                 if (d->init_dma)
1415                         rc = d->init_dma(hwif, d);
1416                 else
1417                         rc = ide_hwif_setup_dma(hwif, d);
1418
1419                 if (rc < 0) {
1420                         printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1421                         hwif->dma_base = 0;
1422                         hwif->swdma_mask = 0;
1423                         hwif->mwdma_mask = 0;
1424                         hwif->ultra_mask = 0;
1425                 } else if (d->dma_ops)
1426                         hwif->dma_ops = d->dma_ops;
1427         }
1428
1429         if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1430             ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1431                 if (hwif->mate)
1432                         hwif->mate->serialized = hwif->serialized = 1;
1433         }
1434
1435         if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1436                 hwif->rqsize = 256;
1437
1438         /* call chipset specific routine for each enabled port */
1439         if (d->init_hwif)
1440                 d->init_hwif(hwif);
1441 }
1442
1443 static void ide_port_cable_detect(ide_hwif_t *hwif)
1444 {
1445         const struct ide_port_ops *port_ops = hwif->port_ops;
1446
1447         if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1448                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1449                         hwif->cbl = port_ops->cable_detect(hwif);
1450         }
1451 }
1452
1453 static ssize_t store_delete_devices(struct device *portdev,
1454                                     struct device_attribute *attr,
1455                                     const char *buf, size_t n)
1456 {
1457         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1458
1459         if (strncmp(buf, "1", n))
1460                 return -EINVAL;
1461
1462         ide_port_unregister_devices(hwif);
1463
1464         return n;
1465 };
1466
1467 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1468
1469 static ssize_t store_scan(struct device *portdev,
1470                           struct device_attribute *attr,
1471                           const char *buf, size_t n)
1472 {
1473         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1474
1475         if (strncmp(buf, "1", n))
1476                 return -EINVAL;
1477
1478         ide_port_unregister_devices(hwif);
1479         ide_port_scan(hwif);
1480
1481         return n;
1482 };
1483
1484 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1485
1486 static struct device_attribute *ide_port_attrs[] = {
1487         &dev_attr_delete_devices,
1488         &dev_attr_scan,
1489         NULL
1490 };
1491
1492 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1493 {
1494         int i, uninitialized_var(rc);
1495
1496         for (i = 0; ide_port_attrs[i]; i++) {
1497                 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1498                 if (rc)
1499                         break;
1500         }
1501
1502         return rc;
1503 }
1504
1505 static unsigned int ide_indexes;
1506
1507 /**
1508  *      ide_find_port_slot      -       find free port slot
1509  *      @d: IDE port info
1510  *
1511  *      Return the new port slot index or -ENOENT if we are out of free slots.
1512  */
1513
1514 static int ide_find_port_slot(const struct ide_port_info *d)
1515 {
1516         int idx = -ENOENT;
1517         u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1518         u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
1519
1520         /*
1521          * Claim an unassigned slot.
1522          *
1523          * Give preference to claiming other slots before claiming ide0/ide1,
1524          * just in case there's another interface yet-to-be-scanned
1525          * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1526          *
1527          * Unless there is a bootable card that does not use the standard
1528          * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1529          */
1530         mutex_lock(&ide_cfg_mtx);
1531         if (MAX_HWIFS == 1) {
1532                 if (ide_indexes == 0 && i == 0)
1533                         idx = 1;
1534         } else {
1535                 if (bootable) {
1536                         if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1537                                 idx = ffz(ide_indexes | i);
1538                 } else {
1539                         if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1540                                 idx = ffz(ide_indexes | 3);
1541                         else if ((ide_indexes & 3) != 3)
1542                                 idx = ffz(ide_indexes);
1543                 }
1544         }
1545         if (idx >= 0)
1546                 ide_indexes |= (1 << idx);
1547         mutex_unlock(&ide_cfg_mtx);
1548
1549         return idx;
1550 }
1551
1552 static void ide_free_port_slot(int idx)
1553 {
1554         mutex_lock(&ide_cfg_mtx);
1555         ide_indexes &= ~(1 << idx);
1556         mutex_unlock(&ide_cfg_mtx);
1557 }
1558
1559 struct ide_host *ide_host_alloc_all(const struct ide_port_info *d,
1560                                     hw_regs_t **hws)
1561 {
1562         struct ide_host *host;
1563         int i;
1564
1565         host = kzalloc(sizeof(*host), GFP_KERNEL);
1566         if (host == NULL)
1567                 return NULL;
1568
1569         for (i = 0; i < MAX_HWIFS; i++) {
1570                 ide_hwif_t *hwif;
1571                 int idx;
1572
1573                 if (hws[i] == NULL)
1574                         continue;
1575
1576                 hwif = kzalloc(sizeof(*hwif), GFP_KERNEL);
1577                 if (hwif == NULL)
1578                         continue;
1579
1580                 idx = ide_find_port_slot(d);
1581                 if (idx < 0) {
1582                         printk(KERN_ERR "%s: no free slot for interface\n",
1583                                         d ? d->name : "ide");
1584                         kfree(hwif);
1585                         continue;
1586                 }
1587
1588                 ide_init_port_data(hwif, idx);
1589
1590                 hwif->host = host;
1591
1592                 host->ports[i] = hwif;
1593                 host->n_ports++;
1594         }
1595
1596         if (host->n_ports == 0) {
1597                 kfree(host);
1598                 return NULL;
1599         }
1600
1601         if (hws[0])
1602                 host->dev[0] = hws[0]->dev;
1603
1604         if (d)
1605                 host->host_flags = d->host_flags;
1606
1607         return host;
1608 }
1609 EXPORT_SYMBOL_GPL(ide_host_alloc_all);
1610
1611 struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
1612 {
1613         hw_regs_t *hws_all[MAX_HWIFS];
1614         int i;
1615
1616         for (i = 0; i < MAX_HWIFS; i++)
1617                 hws_all[i] = (i < 4) ? hws[i] : NULL;
1618
1619         return ide_host_alloc_all(d, hws_all);
1620 }
1621 EXPORT_SYMBOL_GPL(ide_host_alloc);
1622
1623 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1624                       hw_regs_t **hws)
1625 {
1626         ide_hwif_t *hwif, *mate = NULL;
1627         int i, j = 0;
1628
1629         for (i = 0; i < MAX_HWIFS; i++) {
1630                 hwif = host->ports[i];
1631
1632                 if (hwif == NULL) {
1633                         mate = NULL;
1634                         continue;
1635                 }
1636
1637                 ide_init_port_hw(hwif, hws[i]);
1638                 ide_port_apply_params(hwif);
1639
1640                 if (d == NULL) {
1641                         mate = NULL;
1642                         continue;
1643                 }
1644
1645                 if ((i & 1) && mate) {
1646                         hwif->mate = mate;
1647                         mate->mate = hwif;
1648                 }
1649
1650                 mate = (i & 1) ? NULL : hwif;
1651
1652                 ide_init_port(hwif, i & 1, d);
1653                 ide_port_cable_detect(hwif);
1654                 ide_port_init_devices(hwif);
1655         }
1656
1657         for (i = 0; i < MAX_HWIFS; i++) {
1658                 hwif = host->ports[i];
1659
1660                 if (hwif == NULL)
1661                         continue;
1662
1663                 if (ide_probe_port(hwif) == 0)
1664                         hwif->present = 1;
1665
1666                 if (hwif->chipset != ide_4drives || !hwif->mate ||
1667                     !hwif->mate->present)
1668                         ide_register_port(hwif);
1669
1670                 if (hwif->present)
1671                         ide_port_tune_devices(hwif);
1672         }
1673
1674         for (i = 0; i < MAX_HWIFS; i++) {
1675                 hwif = host->ports[i];
1676
1677                 if (hwif == NULL)
1678                         continue;
1679
1680                 if (hwif_init(hwif) == 0) {
1681                         printk(KERN_INFO "%s: failed to initialize IDE "
1682                                          "interface\n", hwif->name);
1683                         hwif->present = 0;
1684                         continue;
1685                 }
1686
1687                 j++;
1688
1689                 if (hwif->present)
1690                         ide_port_setup_devices(hwif);
1691
1692                 ide_acpi_init(hwif);
1693
1694                 if (hwif->present)
1695                         ide_acpi_port_init_devices(hwif);
1696         }
1697
1698         for (i = 0; i < MAX_HWIFS; i++) {
1699                 hwif = host->ports[i];
1700
1701                 if (hwif == NULL)
1702                         continue;
1703
1704                 if (hwif->chipset == ide_unknown)
1705                         hwif->chipset = ide_generic;
1706
1707                 if (hwif->present)
1708                         hwif_register_devices(hwif);
1709         }
1710
1711         for (i = 0; i < MAX_HWIFS; i++) {
1712                 hwif = host->ports[i];
1713
1714                 if (hwif == NULL)
1715                         continue;
1716
1717                 ide_sysfs_register_port(hwif);
1718                 ide_proc_register_port(hwif);
1719
1720                 if (hwif->present)
1721                         ide_proc_port_register_devices(hwif);
1722         }
1723
1724         return j ? 0 : -1;
1725 }
1726 EXPORT_SYMBOL_GPL(ide_host_register);
1727
1728 int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
1729                  struct ide_host **hostp)
1730 {
1731         struct ide_host *host;
1732         int rc;
1733
1734         host = ide_host_alloc(d, hws);
1735         if (host == NULL)
1736                 return -ENOMEM;
1737
1738         rc = ide_host_register(host, d, hws);
1739         if (rc) {
1740                 ide_host_free(host);
1741                 return rc;
1742         }
1743
1744         if (hostp)
1745                 *hostp = host;
1746
1747         return 0;
1748 }
1749 EXPORT_SYMBOL_GPL(ide_host_add);
1750
1751 void ide_host_free(struct ide_host *host)
1752 {
1753         ide_hwif_t *hwif;
1754         int i;
1755
1756         for (i = 0; i < MAX_HWIFS; i++) {
1757                 hwif = host->ports[i];
1758
1759                 if (hwif == NULL)
1760                         continue;
1761
1762                 ide_free_port_slot(hwif->index);
1763                 kfree(hwif);
1764         }
1765
1766         kfree(host);
1767 }
1768 EXPORT_SYMBOL_GPL(ide_host_free);
1769
1770 void ide_host_remove(struct ide_host *host)
1771 {
1772         int i;
1773
1774         for (i = 0; i < MAX_HWIFS; i++) {
1775                 if (host->ports[i])
1776                         ide_unregister(host->ports[i]);
1777         }
1778
1779         ide_host_free(host);
1780 }
1781 EXPORT_SYMBOL_GPL(ide_host_remove);
1782
1783 void ide_port_scan(ide_hwif_t *hwif)
1784 {
1785         ide_port_apply_params(hwif);
1786         ide_port_cable_detect(hwif);
1787         ide_port_init_devices(hwif);
1788
1789         if (ide_probe_port(hwif) < 0)
1790                 return;
1791
1792         hwif->present = 1;
1793
1794         ide_port_tune_devices(hwif);
1795         ide_acpi_port_init_devices(hwif);
1796         ide_port_setup_devices(hwif);
1797         hwif_register_devices(hwif);
1798         ide_proc_port_register_devices(hwif);
1799 }
1800 EXPORT_SYMBOL_GPL(ide_port_scan);
1801
1802 static void ide_legacy_init_one(hw_regs_t **hws, hw_regs_t *hw,
1803                                 u8 port_no, const struct ide_port_info *d,
1804                                 unsigned long config)
1805 {
1806         unsigned long base, ctl;
1807         int irq;
1808
1809         if (port_no == 0) {
1810                 base = 0x1f0;
1811                 ctl  = 0x3f6;
1812                 irq  = 14;
1813         } else {
1814                 base = 0x170;
1815                 ctl  = 0x376;
1816                 irq  = 15;
1817         }
1818
1819         if (!request_region(base, 8, d->name)) {
1820                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1821                                 d->name, base, base + 7);
1822                 return;
1823         }
1824
1825         if (!request_region(ctl, 1, d->name)) {
1826                 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1827                                 d->name, ctl);
1828                 release_region(base, 8);
1829                 return;
1830         }
1831
1832         ide_std_init_ports(hw, base, ctl);
1833         hw->irq = irq;
1834         hw->chipset = d->chipset;
1835         hw->config = config;
1836
1837         hws[port_no] = hw;
1838 }
1839
1840 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
1841 {
1842         hw_regs_t hw[2], *hws[] = { NULL, NULL, NULL, NULL };
1843
1844         memset(&hw, 0, sizeof(hw));
1845
1846         if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
1847                 ide_legacy_init_one(hws, &hw[0], 0, d, config);
1848         ide_legacy_init_one(hws, &hw[1], 1, d, config);
1849
1850         if (hws[0] == NULL && hws[1] == NULL &&
1851             (d->host_flags & IDE_HFLAG_SINGLE))
1852                 return -ENOENT;
1853
1854         return ide_host_add(d, hws, NULL);
1855 }
1856 EXPORT_SYMBOL_GPL(ide_legacy_device_add);