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 <linux/uaccess.h>
  40 #include <asm/io.h>
  41
  42 /**
  43  *      generic_id              -       add a generic drive id
  44  *      @drive: drive to make an ID block for
  45  *
  46  *      Add a fake id field to the drive we are passed. This allows
  47  *      use to skip a ton of NULL checks (which people always miss)
  48  *      and make drive properties unconditional outside of this file
  49  */
  50
  51 static void generic_id(ide_drive_t *drive)
  52 {
  53         u16 *id = drive->id;
  54
  55         id[ATA_ID_CUR_CYLS]     = id[ATA_ID_CYLS]       = drive->cyl;
  56         id[ATA_ID_CUR_HEADS]    = id[ATA_ID_HEADS]      = drive->head;
  57         id[ATA_ID_CUR_SECTORS]  = id[ATA_ID_SECTORS]    = drive->sect;
  58 }
  59
  60 static void ide_disk_init_chs(ide_drive_t *drive)
  61 {
  62         u16 *id = drive->id;
  63
  64         /* Extract geometry if we did not already have one for the drive */
  65         if (!drive->cyl || !drive->head || !drive->sect) {
  66                 drive->cyl  = drive->bios_cyl  = id[ATA_ID_CYLS];
  67                 drive->head = drive->bios_head = id[ATA_ID_HEADS];
  68                 drive->sect = drive->bios_sect = id[ATA_ID_SECTORS];
  69         }
  70
  71         /* Handle logical geometry translation by the drive */
  72         if (ata_id_current_chs_valid(id)) {
  73                 drive->cyl  = id[ATA_ID_CUR_CYLS];
  74                 drive->head = id[ATA_ID_CUR_HEADS];
  75                 drive->sect = id[ATA_ID_CUR_SECTORS];
  76         }
  77
  78         /* Use physical geometry if what we have still makes no sense */
  79         if (drive->head > 16 && id[ATA_ID_HEADS] && id[ATA_ID_HEADS] <= 16) {
  80                 drive->cyl  = id[ATA_ID_CYLS];
  81                 drive->head = id[ATA_ID_HEADS];
  82                 drive->sect = id[ATA_ID_SECTORS];
  83         }
  84 }
  85
  86 static void ide_disk_init_mult_count(ide_drive_t *drive)
  87 {
  88         u16 *id = drive->id;
  89         u8 max_multsect = id[ATA_ID_MAX_MULTSECT] & 0xff;
  90
  91         if (max_multsect) {
  92                 if ((max_multsect / 2) > 1)
  93                         id[ATA_ID_MULTSECT] = max_multsect | 0x100;
  94                 else
  95                         id[ATA_ID_MULTSECT] &= ~0x1ff;
  96
  97                 drive->mult_req = id[ATA_ID_MULTSECT] & 0xff;
  98
  99                 if (drive->mult_req)
 100                         drive->special_flags |= IDE_SFLAG_SET_MULTMODE;
 101         }
 102 }
 103
 104 static void ide_classify_ata_dev(ide_drive_t *drive)
 105 {
 106         u16 *id = drive->id;
 107         char *m = (char *)&id[ATA_ID_PROD];
 108         int is_cfa = ata_id_is_cfa(id);
 109
 110         /* CF devices are *not* removable in Linux definition of the term */
 111         if (is_cfa == 0 && (id[ATA_ID_CONFIG] & (1 << 7)))
 112                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 113
 114         drive->media = ide_disk;
 115
 116         if (!ata_id_has_unload(drive->id))
 117                 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
 118
 119         printk(KERN_INFO "%s: %s, %s DISK drive\n", drive->name, m,
 120                 is_cfa ? "CFA" : "ATA");
 121 }
 122
 123 static void ide_classify_atapi_dev(ide_drive_t *drive)
 124 {
 125         u16 *id = drive->id;
 126         char *m = (char *)&id[ATA_ID_PROD];
 127         u8 type = (id[ATA_ID_CONFIG] >> 8) & 0x1f;
 128
 129         printk(KERN_INFO "%s: %s, ATAPI ", drive->name, m);
 130         switch (type) {
 131         case ide_floppy:
 132                 if (!strstr(m, "CD-ROM")) {
 133                         if (!strstr(m, "oppy") &&
 134                             !strstr(m, "poyp") &&
 135                             !strstr(m, "ZIP"))
 136                                 printk(KERN_CONT "cdrom or floppy?, assuming ");
 137                         if (drive->media != ide_cdrom) {
 138                                 printk(KERN_CONT "FLOPPY");
 139                                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 140                                 break;
 141                         }
 142                 }
 143                 /* Early cdrom models used zero */
 144                 type = ide_cdrom;
 145                 /* fall through */
 146         case ide_cdrom:
 147                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 148 #ifdef CONFIG_PPC
 149                 /* kludge for Apple PowerBook internal zip */
 150                 if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) {
 151                         printk(KERN_CONT "FLOPPY");
 152                         type = ide_floppy;
 153                         break;
 154                 }
 155 #endif
 156                 printk(KERN_CONT "CD/DVD-ROM");
 157                 break;
 158         case ide_tape:
 159                 printk(KERN_CONT "TAPE");
 160                 break;
 161         case ide_optical:
 162                 printk(KERN_CONT "OPTICAL");
 163                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 164                 break;
 165         default:
 166                 printk(KERN_CONT "UNKNOWN (type %d)", type);
 167                 break;
 168         }
 169
 170         printk(KERN_CONT " drive\n");
 171         drive->media = type;
 172         /* an ATAPI device ignores DRDY */
 173         drive->ready_stat = 0;
 174         if (ata_id_cdb_intr(id))
 175                 drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;
 176         drive->dev_flags |= IDE_DFLAG_DOORLOCKING;
 177         /* we don't do head unloading on ATAPI devices */
 178         drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
 179 }
 180
 181 /**
 182  *      do_identify     -       identify a drive
 183  *      @drive: drive to identify
 184  *      @cmd: command used
 185  *      @id: buffer for IDENTIFY data
 186  *
 187  *      Called when we have issued a drive identify command to
 188  *      read and parse the results. This function is run with
 189  *      interrupts disabled.
 190  */
 191
 192 static void do_identify(ide_drive_t *drive, u8 cmd, u16 *id)
 193 {
 194         ide_hwif_t *hwif = drive->hwif;
 195         char *m = (char *)&id[ATA_ID_PROD];
 196         unsigned long flags;
 197         int bswap = 1;
 198
 199         /* local CPU only; some systems need this */
 200         local_irq_save(flags);
 201         /* read 512 bytes of id info */
 202         hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
 203         local_irq_restore(flags);
 204
 205         drive->dev_flags |= IDE_DFLAG_ID_READ;
 206 #ifdef DEBUG
 207         printk(KERN_INFO "%s: dumping identify data\n", drive->name);
 208         ide_dump_identify((u8 *)id);
 209 #endif
 210         ide_fix_driveid(id);
 211
 212         /*
 213          *  ATA_CMD_ID_ATA returns little-endian info,
 214          *  ATA_CMD_ID_ATAPI *usually* returns little-endian info.
 215          */
 216         if (cmd == ATA_CMD_ID_ATAPI) {
 217                 if ((m[0] == 'N' && m[1] == 'E') ||  /* NEC */
 218                     (m[0] == 'F' && m[1] == 'X') ||  /* Mitsumi */
 219                     (m[0] == 'P' && m[1] == 'i'))    /* Pioneer */
 220                         /* Vertos drives may still be weird */
 221                         bswap ^= 1;
 222         }
 223
 224         ide_fixstring(m, ATA_ID_PROD_LEN, bswap);
 225         ide_fixstring((char *)&id[ATA_ID_FW_REV], ATA_ID_FW_REV_LEN, bswap);
 226         ide_fixstring((char *)&id[ATA_ID_SERNO], ATA_ID_SERNO_LEN, bswap);
 227
 228         /* we depend on this a lot! */
 229         m[ATA_ID_PROD_LEN - 1] = '\0';
 230
 231         if (strstr(m, "E X A B Y T E N E S T"))
 232                 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 233         else
 234                 drive->dev_flags |= IDE_DFLAG_PRESENT;
 235 }
 236
 237 /**
 238  *      ide_dev_read_id -       send ATA/ATAPI IDENTIFY command
 239  *      @drive: drive to identify
 240  *      @cmd: command to use
 241  *      @id: buffer for IDENTIFY data
 242  *      @irq_ctx: flag set when called from the IRQ context
 243  *
 244  *      Sends an ATA(PI) IDENTIFY request to a drive and waits for a response.
 245  *
 246  *      Returns:        0  device was identified
 247  *                      1  device timed-out (no response to identify request)
 248  *                      2  device aborted the command (refused to identify itself)
 249  */
 250
 251 int ide_dev_read_id(ide_drive_t *drive, u8 cmd, u16 *id, int irq_ctx)
 252 {
 253         ide_hwif_t *hwif = drive->hwif;
 254         struct ide_io_ports *io_ports = &hwif->io_ports;
 255         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 256         int use_altstatus = 0, rc;
 257         unsigned long timeout;
 258         u8 s = 0, a = 0;
 259
 260         /*
 261          * Disable device IRQ.  Otherwise we'll get spurious interrupts
 262          * during the identify phase that the IRQ handler isn't expecting.
 263          */
 264         if (io_ports->ctl_addr)
 265                 tp_ops->write_devctl(hwif, ATA_NIEN | ATA_DEVCTL_OBS);
 266
 267         /* take a deep breath */
 268         if (irq_ctx)
 269                 mdelay(50);
 270         else
 271                 msleep(50);
 272
 273         if (io_ports->ctl_addr &&
 274             (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) {
 275                 a = tp_ops->read_altstatus(hwif);
 276                 s = tp_ops->read_status(hwif);
 277                 if ((a ^ s) & ~ATA_SENSE)
 278                         /* ancient Seagate drives, broken interfaces */
 279                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
 280                                          "instead of ALTSTATUS(0x%02x)\n",
 281                                          drive->name, s, a);
 282                 else
 283                         /* use non-intrusive polling */
 284                         use_altstatus = 1;
 285         }
 286
 287         /* set features register for atapi
 288          * identify command to be sure of reply
 289          */
 290         if (cmd == ATA_CMD_ID_ATAPI) {
 291                 struct ide_taskfile tf;
 292
 293                 memset(&tf, 0, sizeof(tf));
 294                 /* disable DMA & overlap */
 295                 tp_ops->tf_load(drive, &tf, IDE_VALID_FEATURE);
 296         }
 297
 298         /* ask drive for ID */
 299         tp_ops->exec_command(hwif, cmd);
 300
 301         timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 302
 303         /* wait for IRQ and ATA_DRQ */
 304         if (irq_ctx) {
 305                 rc = __ide_wait_stat(drive, ATA_DRQ, BAD_R_STAT, timeout, &s);
 306                 if (rc)
 307                         return 1;
 308         } else {
 309                 rc = ide_busy_sleep(drive, timeout, use_altstatus);
 310                 if (rc)
 311                         return 1;
 312
 313                 msleep(50);
 314                 s = tp_ops->read_status(hwif);
 315         }
 316
 317         if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
 318                 /* drive returned ID */
 319                 do_identify(drive, cmd, id);
 320                 /* drive responded with ID */
 321                 rc = 0;
 322                 /* clear drive IRQ */
 323                 (void)tp_ops->read_status(hwif);
 324         } else {
 325                 /* drive refused ID */
 326                 rc = 2;
 327         }
 328         return rc;
 329 }
 330
 331 int ide_busy_sleep(ide_drive_t *drive, unsigned long timeout, int altstatus)
 332 {
 333         ide_hwif_t *hwif = drive->hwif;
 334         u8 stat;
 335
 336         timeout += jiffies;
 337
 338         do {
 339                 msleep(50);     /* give drive a breather */
 340                 stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
 341                                  : hwif->tp_ops->read_status(hwif);
 342                 if ((stat & ATA_BUSY) == 0)
 343                         return 0;
 344         } while (time_before(jiffies, timeout));
 345
 346         printk(KERN_ERR "%s: timeout in %s\n", drive->name, __func__);
 347
 348         return 1;       /* drive timed-out */
 349 }
 350
 351 static u8 ide_read_device(ide_drive_t *drive)
 352 {
 353         struct ide_taskfile tf;
 354
 355         drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_DEVICE);
 356
 357         return tf.device;
 358 }
 359
 360 /**
 361  *      do_probe                -       probe an IDE device
 362  *      @drive: drive to probe
 363  *      @cmd: command to use
 364  *
 365  *      do_probe() has the difficult job of finding a drive if it exists,
 366  *      without getting hung up if it doesn't exist, without trampling on
 367  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 368  *
 369  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 370  *      but does not respond right away, the probe will "hang in there"
 371  *      for the maximum wait time (about 30 seconds), otherwise it will
 372  *      exit much more quickly.
 373  *
 374  * Returns:     0  device was identified
 375  *              1  device timed-out (no response to identify request)
 376  *              2  device aborted the command (refused to identify itself)
 377  *              3  bad status from device (possible for ATAPI drives)
 378  *              4  probe was not attempted because failure was obvious
 379  */
 380
 381 static int do_probe (ide_drive_t *drive, u8 cmd)
 382 {
 383         ide_hwif_t *hwif = drive->hwif;
 384         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 385         u16 *id = drive->id;
 386         int rc;
 387         u8 present = !!(drive->dev_flags & IDE_DFLAG_PRESENT), stat;
 388
 389         /* avoid waiting for inappropriate probes */
 390         if (present && drive->media != ide_disk && cmd == ATA_CMD_ID_ATA)
 391                 return 4;
 392
 393 #ifdef DEBUG
 394         printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
 395                 drive->name, present, drive->media,
 396                 (cmd == ATA_CMD_ID_ATA) ? "ATA" : "ATAPI");
 397 #endif
 398
 399         /* needed for some systems
 400          * (e.g. crw9624 as drive0 with disk as slave)
 401          */
 402         msleep(50);
 403         tp_ops->dev_select(drive);
 404         msleep(50);
 405
 406         if (ide_read_device(drive) != drive->select && present == 0) {
 407                 if (drive->dn & 1) {
 408                         /* exit with drive0 selected */
 409                         tp_ops->dev_select(hwif->devices[0]);
 410                         /* allow ATA_BUSY to assert & clear */
 411                         msleep(50);
 412                 }
 413                 /* no i/f present: mmm.. this should be a 4 -ml */
 414                 return 3;
 415         }
 416
 417         stat = tp_ops->read_status(hwif);
 418
 419         if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) ||
 420             present || cmd == ATA_CMD_ID_ATAPI) {
 421                 rc = ide_dev_read_id(drive, cmd, id, 0);
 422                 if (rc)
 423                         /* failed: try again */
 424                         rc = ide_dev_read_id(drive, cmd, id, 0);
 425
 426                 stat = tp_ops->read_status(hwif);
 427
 428                 if (stat == (ATA_BUSY | ATA_DRDY))
 429                         return 4;
 430
 431                 if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) {
 432                         printk(KERN_ERR "%s: no response (status = 0x%02x), "
 433                                         "resetting drive\n", drive->name, stat);
 434                         msleep(50);
 435                         tp_ops->dev_select(drive);
 436                         msleep(50);
 437                         tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
 438                         (void)ide_busy_sleep(drive, WAIT_WORSTCASE, 0);
 439                         rc = ide_dev_read_id(drive, cmd, id, 0);
 440                 }
 441
 442                 /* ensure drive IRQ is clear */
 443                 stat = tp_ops->read_status(hwif);
 444
 445                 if (rc == 1)
 446                         printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
 447                                         drive->name, stat);
 448         } else {
 449                 /* not present or maybe ATAPI */
 450                 rc = 3;
 451         }
 452         if (drive->dn & 1) {
 453                 /* exit with drive0 selected */
 454                 tp_ops->dev_select(hwif->devices[0]);
 455                 msleep(50);
 456                 /* ensure drive irq is clear */
 457                 (void)tp_ops->read_status(hwif);
 458         }
 459         return rc;
 460 }
 461
 462 /**
 463  *      probe_for_drives        -       upper level drive probe
 464  *      @drive: drive to probe for
 465  *
 466  *      probe_for_drive() tests for existence of a given drive using do_probe()
 467  *      and presents things to the user as needed.
 468  *
 469  *      Returns:        0  no device was found
 470  *                      1  device was found
 471  *                         (note: IDE_DFLAG_PRESENT might still be not set)
 472  */
 473
 474 static u8 probe_for_drive(ide_drive_t *drive)
 475 {
 476         char *m;
 477         int rc;
 478         u8 cmd;
 479
 480         drive->dev_flags &= ~IDE_DFLAG_ID_READ;
 481
 482         m = (char *)&drive->id[ATA_ID_PROD];
 483         strcpy(m, "UNKNOWN");
 484
 485         /* skip probing? */
 486         if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0) {
 487                 /* if !(success||timed-out) */
 488                 cmd = ATA_CMD_ID_ATA;
 489                 rc = do_probe(drive, cmd);
 490                 if (rc >= 2) {
 491                         /* look for ATAPI device */
 492                         cmd = ATA_CMD_ID_ATAPI;
 493                         rc = do_probe(drive, cmd);
 494                 }
 495
 496                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 497                         return 0;
 498
 499                 /* identification failed? */
 500                 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
 501                         if (drive->media == ide_disk) {
 502                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 503                                         drive->name, drive->cyl,
 504                                         drive->head, drive->sect);
 505                         } else if (drive->media == ide_cdrom) {
 506                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 507                         } else {
 508                                 /* nuke it */
 509                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 510                                 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 511                         }
 512                 } else {
 513                         if (cmd == ATA_CMD_ID_ATAPI)
 514                                 ide_classify_atapi_dev(drive);
 515                         else
 516                                 ide_classify_ata_dev(drive);
 517                 }
 518         }
 519
 520         if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 521                 return 0;
 522
 523         /* The drive wasn't being helpful. Add generic info only */
 524         if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
 525                 generic_id(drive);
 526                 return 1;
 527         }
 528
 529         if (drive->media == ide_disk) {
 530                 ide_disk_init_chs(drive);
 531                 ide_disk_init_mult_count(drive);
 532         }
 533
 534         return 1;
 535 }
 536
 537 static void hwif_release_dev(struct device *dev)
 538 {
 539         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 540
 541         complete(&hwif->gendev_rel_comp);
 542 }
 543
 544 static int ide_register_port(ide_hwif_t *hwif)
 545 {
 546         int ret;
 547
 548         /* register with global device tree */
 549         dev_set_name(&hwif->gendev, "%s", hwif->name);
 550         dev_set_drvdata(&hwif->gendev, hwif);
 551         if (hwif->gendev.parent == NULL)
 552                 hwif->gendev.parent = hwif->dev;
 553         hwif->gendev.release = hwif_release_dev;
 554
 555         ret = device_register(&hwif->gendev);
 556         if (ret < 0) {
 557                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
 558                         __func__, ret);
 559                 goto out;
 560         }
 561
 562         hwif->portdev = device_create(ide_port_class, &hwif->gendev,
 563                                       MKDEV(0, 0), hwif, "%s", hwif->name);
 564         if (IS_ERR(hwif->portdev)) {
 565                 ret = PTR_ERR(hwif->portdev);
 566                 device_unregister(&hwif->gendev);
 567         }
 568 out:
 569         return ret;
 570 }
 571
 572 /**
 573  *      ide_port_wait_ready     -       wait for port to become ready
 574  *      @hwif: IDE port
 575  *
 576  *      This is needed on some PPCs and a bunch of BIOS-less embedded
 577  *      platforms.  Typical cases are:
 578  *
 579  *      - The firmware hard reset the disk before booting the kernel,
 580  *        the drive is still doing it's poweron-reset sequence, that
 581  *        can take up to 30 seconds.
 582  *
 583  *      - The firmware does nothing (or no firmware), the device is
 584  *        still in POST state (same as above actually).
 585  *
 586  *      - Some CD/DVD/Writer combo drives tend to drive the bus during
 587  *        their reset sequence even when they are non-selected slave
 588  *        devices, thus preventing discovery of the main HD.
 589  *
 590  *      Doing this wait-for-non-busy should not harm any existing
 591  *      configuration and fix some issues like the above.
 592  *
 593  *      BenH.
 594  *
 595  *      Returns 0 on success, error code (< 0) otherwise.
 596  */
 597
 598 static int ide_port_wait_ready(ide_hwif_t *hwif)
 599 {
 600         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 601         ide_drive_t *drive;
 602         int i, rc;
 603
 604         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 605
 606         /* Let HW settle down a bit from whatever init state we
 607          * come from */
 608         mdelay(2);
 609
 610         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 611          * I know of at least one disk who takes 31 seconds, I use 35
 612          * here to be safe
 613          */
 614         rc = ide_wait_not_busy(hwif, 35000);
 615         if (rc)
 616                 return rc;
 617
 618         /* Now make sure both master & slave are ready */
 619         ide_port_for_each_dev(i, drive, hwif) {
 620                 /* Ignore disks that we will not probe for later. */
 621                 if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0 ||
 622                     (drive->dev_flags & IDE_DFLAG_PRESENT)) {
 623                         tp_ops->dev_select(drive);
 624                         tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
 625                         mdelay(2);
 626                         rc = ide_wait_not_busy(hwif, 35000);
 627                         if (rc)
 628                                 goto out;
 629                 } else
 630                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
 631                                           drive->name);
 632         }
 633 out:
 634         /* Exit function with master reselected (let's be sane) */
 635         if (i)
 636                 tp_ops->dev_select(hwif->devices[0]);
 637
 638         return rc;
 639 }
 640
 641 /**
 642  *      ide_undecoded_slave     -       look for bad CF adapters
 643  *      @dev1: slave device
 644  *
 645  *      Analyse the drives on the interface and attempt to decide if we
 646  *      have the same drive viewed twice. This occurs with crap CF adapters
 647  *      and PCMCIA sometimes.
 648  */
 649
 650 void ide_undecoded_slave(ide_drive_t *dev1)
 651 {
 652         ide_drive_t *dev0 = dev1->hwif->devices[0];
 653
 654         if ((dev1->dn & 1) == 0 || (dev0->dev_flags & IDE_DFLAG_PRESENT) == 0)
 655                 return;
 656
 657         /* If the models don't match they are not the same product */
 658         if (strcmp((char *)&dev0->id[ATA_ID_PROD],
 659                    (char *)&dev1->id[ATA_ID_PROD]))
 660                 return;
 661
 662         /* Serial numbers do not match */
 663         if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
 664                     (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
 665                 return;
 666
 667         /* No serial number, thankfully very rare for CF */
 668         if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
 669                 return;
 670
 671         /* Appears to be an IDE flash adapter with decode bugs */
 672         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 673
 674         dev1->dev_flags &= ~IDE_DFLAG_PRESENT;
 675 }
 676
 677 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 678
 679 static int ide_probe_port(ide_hwif_t *hwif)
 680 {
 681         ide_drive_t *drive;
 682         unsigned int irqd;
 683         int i, rc = -ENODEV;
 684
 685         BUG_ON(hwif->present);
 686
 687         if ((hwif->devices[0]->dev_flags & IDE_DFLAG_NOPROBE) &&
 688             (hwif->devices[1]->dev_flags & IDE_DFLAG_NOPROBE))
 689                 return -EACCES;
 690
 691         /*
 692          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 693          * we'll install our IRQ driver much later...
 694          */
 695         irqd = hwif->irq;
 696         if (irqd)
 697                 disable_irq(hwif->irq);
 698
 699         if (ide_port_wait_ready(hwif) == -EBUSY)
 700                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 701
 702         /*
 703          * Second drive should only exist if first drive was found,
 704          * but a lot of cdrom drives are configured as single slaves.
 705          */
 706         ide_port_for_each_dev(i, drive, hwif) {
 707                 (void) probe_for_drive(drive);
 708                 if (drive->dev_flags & IDE_DFLAG_PRESENT)
 709                         rc = 0;
 710         }
 711
 712         /*
 713          * Use cached IRQ number. It might be (and is...) changed by probe
 714          * code above
 715          */
 716         if (irqd)
 717                 enable_irq(irqd);
 718
 719         return rc;
 720 }
 721
 722 static void ide_port_tune_devices(ide_hwif_t *hwif)
 723 {
 724         const struct ide_port_ops *port_ops = hwif->port_ops;
 725         ide_drive_t *drive;
 726         int i;
 727
 728         ide_port_for_each_present_dev(i, drive, hwif) {
 729                 ide_check_nien_quirk_list(drive);
 730
 731                 if (port_ops && port_ops->quirkproc)
 732                         port_ops->quirkproc(drive);
 733         }
 734
 735         ide_port_for_each_present_dev(i, drive, hwif) {
 736                 ide_set_max_pio(drive);
 737
 738                 drive->dev_flags |= IDE_DFLAG_NICE1;
 739
 740                 if (hwif->dma_ops)
 741                         ide_set_dma(drive);
 742         }
 743 }
 744
 745 static void ide_initialize_rq(struct request *rq)
 746 {
 747         struct ide_request *req = blk_mq_rq_to_pdu(rq);
 748
 749         scsi_req_init(&req->sreq);
 750         req->sreq.sense = req->sense;
 751 }
 752
 753 /*
 754  * init request queue
 755  */
 756 static int ide_init_queue(ide_drive_t *drive)
 757 {
 758         struct request_queue *q;
 759         ide_hwif_t *hwif = drive->hwif;
 760         int max_sectors = 256;
 761         int max_sg_entries = PRD_ENTRIES;
 762
 763         /*
 764          *      Our default set up assumes the normal IDE case,
 765          *      that is 64K segmenting, standard PRD setup
 766          *      and LBA28. Some drivers then impose their own
 767          *      limits and LBA48 we could raise it but as yet
 768          *      do not.
 769          */
 770         q = blk_alloc_queue_node(GFP_KERNEL, hwif_to_node(hwif), NULL);
 771         if (!q)
 772                 return 1;
 773
 774         q->request_fn = do_ide_request;
 775         q->initialize_rq_fn = ide_initialize_rq;
 776         q->cmd_size = sizeof(struct ide_request);
 777         blk_queue_flag_set(QUEUE_FLAG_SCSI_PASSTHROUGH, q);
 778         if (blk_init_allocated_queue(q) < 0) {
 779                 blk_cleanup_queue(q);
 780                 return 1;
 781         }
 782
 783         q->queuedata = drive;
 784         blk_queue_segment_boundary(q, 0xffff);
 785
 786         if (hwif->rqsize < max_sectors)
 787                 max_sectors = hwif->rqsize;
 788         blk_queue_max_hw_sectors(q, max_sectors);
 789
 790 #ifdef CONFIG_PCI
 791         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 792          * creates segments that don't completely match our boundary
 793          * requirements and thus need to be broken up again. Because it
 794          * doesn't align properly either, we may actually have to break up
 795          * to more segments than what was we got in the first place, a max
 796          * worst case is twice as many.
 797          * This will be fixed once we teach pci_map_sg() about our boundary
 798          * requirements, hopefully soon. *FIXME*
 799          */
 800         max_sg_entries >>= 1;
 801 #endif /* CONFIG_PCI */
 802
 803         blk_queue_max_segments(q, max_sg_entries);
 804
 805         /* assign drive queue */
 806         drive->queue = q;
 807
 808         return 0;
 809 }
 810
 811 static DEFINE_MUTEX(ide_cfg_mtx);
 812
 813 /*
 814  * For any present drive:
 815  * - allocate the block device queue
 816  */
 817 static int ide_port_setup_devices(ide_hwif_t *hwif)
 818 {
 819         ide_drive_t *drive;
 820         int i, j = 0;
 821
 822         mutex_lock(&ide_cfg_mtx);
 823         ide_port_for_each_present_dev(i, drive, hwif) {
 824                 if (ide_init_queue(drive)) {
 825                         printk(KERN_ERR "ide: failed to init %s\n",
 826                                         drive->name);
 827                         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 828                         continue;
 829                 }
 830
 831                 j++;
 832         }
 833         mutex_unlock(&ide_cfg_mtx);
 834
 835         return j;
 836 }
 837
 838 static void ide_host_enable_irqs(struct ide_host *host)
 839 {
 840         ide_hwif_t *hwif;
 841         int i;
 842
 843         ide_host_for_each_port(i, hwif, host) {
 844                 if (hwif == NULL)
 845                         continue;
 846
 847                 /* clear any pending IRQs */
 848                 hwif->tp_ops->read_status(hwif);
 849
 850                 /* unmask IRQs */
 851                 if (hwif->io_ports.ctl_addr)
 852                         hwif->tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
 853         }
 854 }
 855
 856 /*
 857  * This routine sets up the IRQ for an IDE interface.
 858  */
 859 static int init_irq (ide_hwif_t *hwif)
 860 {
 861         struct ide_io_ports *io_ports = &hwif->io_ports;
 862         struct ide_host *host = hwif->host;
 863         irq_handler_t irq_handler = host->irq_handler;
 864         int sa = host->irq_flags;
 865
 866         if (irq_handler == NULL)
 867                 irq_handler = ide_intr;
 868
 869         if (!host->get_lock)
 870                 if (request_irq(hwif->irq, irq_handler, sa, hwif->name, hwif))
 871                         goto out_up;
 872
 873 #if !defined(__mc68000__)
 874         printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
 875                 io_ports->data_addr, io_ports->status_addr,
 876                 io_ports->ctl_addr, hwif->irq);
 877 #else
 878         printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
 879                 io_ports->data_addr, hwif->irq);
 880 #endif /* __mc68000__ */
 881         if (hwif->host->host_flags & IDE_HFLAG_SERIALIZE)
 882                 printk(KERN_CONT " (serialized)");
 883         printk(KERN_CONT "\n");
 884
 885         return 0;
 886 out_up:
 887         return 1;
 888 }
 889
 890 static int ata_lock(dev_t dev, void *data)
 891 {
 892         /* FIXME: we want to pin hwif down */
 893         return 0;
 894 }
 895
 896 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
 897 {
 898         ide_hwif_t *hwif = data;
 899         int unit = *part >> PARTN_BITS;
 900         ide_drive_t *drive = hwif->devices[unit];
 901
 902         if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 903                 return NULL;
 904
 905         if (drive->media == ide_disk)
 906                 request_module("ide-disk");
 907         if (drive->media == ide_cdrom || drive->media == ide_optical)
 908                 request_module("ide-cd");
 909         if (drive->media == ide_tape)
 910                 request_module("ide-tape");
 911         if (drive->media == ide_floppy)
 912                 request_module("ide-floppy");
 913
 914         return NULL;
 915 }
 916
 917 static struct kobject *exact_match(dev_t dev, int *part, void *data)
 918 {
 919         struct gendisk *p = data;
 920         *part &= (1 << PARTN_BITS) - 1;
 921         return &disk_to_dev(p)->kobj;
 922 }
 923
 924 static int exact_lock(dev_t dev, void *data)
 925 {
 926         struct gendisk *p = data;
 927
 928         if (!get_disk_and_module(p))
 929                 return -1;
 930         return 0;
 931 }
 932
 933 void ide_register_region(struct gendisk *disk)
 934 {
 935         blk_register_region(MKDEV(disk->major, disk->first_minor),
 936                             disk->minors, NULL, exact_match, exact_lock, disk);
 937 }
 938
 939 EXPORT_SYMBOL_GPL(ide_register_region);
 940
 941 void ide_unregister_region(struct gendisk *disk)
 942 {
 943         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
 944                               disk->minors);
 945 }
 946
 947 EXPORT_SYMBOL_GPL(ide_unregister_region);
 948
 949 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
 950 {
 951         ide_hwif_t *hwif = drive->hwif;
 952         unsigned int unit = drive->dn & 1;
 953
 954         disk->major = hwif->major;
 955         disk->first_minor = unit << PARTN_BITS;
 956         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
 957         disk->queue = drive->queue;
 958 }
 959
 960 EXPORT_SYMBOL_GPL(ide_init_disk);
 961
 962 static void drive_release_dev (struct device *dev)
 963 {
 964         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
 965
 966         ide_proc_unregister_device(drive);
 967
 968         blk_cleanup_queue(drive->queue);
 969         drive->queue = NULL;
 970
 971         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 972
 973         complete(&drive->gendev_rel_comp);
 974 }
 975
 976 static int hwif_init(ide_hwif_t *hwif)
 977 {
 978         if (!hwif->irq) {
 979                 printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
 980                 return 0;
 981         }
 982
 983         if (register_blkdev(hwif->major, hwif->name))
 984                 return 0;
 985
 986         if (!hwif->sg_max_nents)
 987                 hwif->sg_max_nents = PRD_ENTRIES;
 988
 989         hwif->sg_table = kmalloc_array(hwif->sg_max_nents,
 990                                        sizeof(struct scatterlist),
 991                                        GFP_KERNEL);
 992         if (!hwif->sg_table) {
 993                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
 994                 goto out;
 995         }
 996
 997         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
 998
 999         if (init_irq(hwif)) {
1000                 printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
1001                         hwif->name, hwif->irq);
1002                 goto out;
1003         }
1004
1005         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1006                             THIS_MODULE, ata_probe, ata_lock, hwif);
1007         return 1;
1008
1009 out:
1010         unregister_blkdev(hwif->major, hwif->name);
1011         return 0;
1012 }
1013
1014 static void hwif_register_devices(ide_hwif_t *hwif)
1015 {
1016         ide_drive_t *drive;
1017         unsigned int i;
1018
1019         ide_port_for_each_present_dev(i, drive, hwif) {
1020                 struct device *dev = &drive->gendev;
1021                 int ret;
1022
1023                 dev_set_name(dev, "%u.%u", hwif->index, i);
1024                 dev_set_drvdata(dev, drive);
1025                 dev->parent = &hwif->gendev;
1026                 dev->bus = &ide_bus_type;
1027                 dev->release = drive_release_dev;
1028
1029                 ret = device_register(dev);
1030                 if (ret < 0)
1031                         printk(KERN_WARNING "IDE: %s: device_register error: "
1032                                             "%d\n", __func__, ret);
1033         }
1034 }
1035
1036 static void ide_port_init_devices(ide_hwif_t *hwif)
1037 {
1038         const struct ide_port_ops *port_ops = hwif->port_ops;
1039         ide_drive_t *drive;
1040         int i;
1041
1042         ide_port_for_each_dev(i, drive, hwif) {
1043                 drive->dn = i + hwif->channel * 2;
1044
1045                 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1046                         drive->io_32bit = 1;
1047                 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
1048                         drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
1049                 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1050                         drive->dev_flags |= IDE_DFLAG_UNMASK;
1051                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1052                         drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
1053
1054                 drive->pio_mode = XFER_PIO_0;
1055
1056                 if (port_ops && port_ops->init_dev)
1057                         port_ops->init_dev(drive);
1058         }
1059 }
1060
1061 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1062                           const struct ide_port_info *d)
1063 {
1064         hwif->channel = port;
1065
1066         hwif->chipset = d->chipset ? d->chipset : ide_pci;
1067
1068         if (d->init_iops)
1069                 d->init_iops(hwif);
1070
1071         /* ->host_flags may be set by ->init_iops (or even earlier...) */
1072         hwif->host_flags |= d->host_flags;
1073         hwif->pio_mask = d->pio_mask;
1074
1075         if (d->tp_ops)
1076                 hwif->tp_ops = d->tp_ops;
1077
1078         /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1079         if ((hwif->host_flags & IDE_HFLAG_DTC2278) == 0 || hwif->channel == 0)
1080                 hwif->port_ops = d->port_ops;
1081
1082         hwif->swdma_mask = d->swdma_mask;
1083         hwif->mwdma_mask = d->mwdma_mask;
1084         hwif->ultra_mask = d->udma_mask;
1085
1086         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1087                 int rc;
1088
1089                 hwif->dma_ops = d->dma_ops;
1090
1091                 if (d->init_dma)
1092                         rc = d->init_dma(hwif, d);
1093                 else
1094                         rc = ide_hwif_setup_dma(hwif, d);
1095
1096                 if (rc < 0) {
1097                         printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1098
1099                         hwif->dma_ops = NULL;
1100                         hwif->dma_base = 0;
1101                         hwif->swdma_mask = 0;
1102                         hwif->mwdma_mask = 0;
1103                         hwif->ultra_mask = 0;
1104                 }
1105         }
1106
1107         if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1108             ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base))
1109                 hwif->host->host_flags |= IDE_HFLAG_SERIALIZE;
1110
1111         if (d->max_sectors)
1112                 hwif->rqsize = d->max_sectors;
1113         else {
1114                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1115                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1116                         hwif->rqsize = 256;
1117                 else
1118                         hwif->rqsize = 65536;
1119         }
1120
1121         /* call chipset specific routine for each enabled port */
1122         if (d->init_hwif)
1123                 d->init_hwif(hwif);
1124 }
1125
1126 static void ide_port_cable_detect(ide_hwif_t *hwif)
1127 {
1128         const struct ide_port_ops *port_ops = hwif->port_ops;
1129
1130         if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1131                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1132                         hwif->cbl = port_ops->cable_detect(hwif);
1133         }
1134 }
1135
1136 static const u8 ide_hwif_to_major[] =
1137         { IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR, IDE4_MAJOR,
1138           IDE5_MAJOR, IDE6_MAJOR, IDE7_MAJOR, IDE8_MAJOR, IDE9_MAJOR };
1139
1140 static void ide_port_init_devices_data(ide_hwif_t *hwif)
1141 {
1142         ide_drive_t *drive;
1143         int i;
1144
1145         ide_port_for_each_dev(i, drive, hwif) {
1146                 u8 j = (hwif->index * MAX_DRIVES) + i;
1147                 u16 *saved_id = drive->id;
1148                 struct request *saved_sense_rq = drive->sense_rq;
1149
1150                 memset(drive, 0, sizeof(*drive));
1151                 memset(saved_id, 0, SECTOR_SIZE);
1152                 drive->id = saved_id;
1153                 drive->sense_rq = saved_sense_rq;
1154
1155                 drive->media                    = ide_disk;
1156                 drive->select                   = (i << 4) | ATA_DEVICE_OBS;
1157                 drive->hwif                     = hwif;
1158                 drive->ready_stat               = ATA_DRDY;
1159                 drive->bad_wstat                = BAD_W_STAT;
1160                 drive->special_flags            = IDE_SFLAG_RECALIBRATE |
1161                                                   IDE_SFLAG_SET_GEOMETRY;
1162                 drive->name[0]                  = 'h';
1163                 drive->name[1]                  = 'd';
1164                 drive->name[2]                  = 'a' + j;
1165                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
1166
1167                 INIT_LIST_HEAD(&drive->list);
1168                 init_completion(&drive->gendev_rel_comp);
1169         }
1170 }
1171
1172 static void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
1173 {
1174         /* fill in any non-zero initial values */
1175         hwif->index     = index;
1176         hwif->major     = ide_hwif_to_major[index];
1177
1178         hwif->name[0]   = 'i';
1179         hwif->name[1]   = 'd';
1180         hwif->name[2]   = 'e';
1181         hwif->name[3]   = '0' + index;
1182
1183         spin_lock_init(&hwif->lock);
1184
1185         timer_setup(&hwif->timer, ide_timer_expiry, 0);
1186
1187         init_completion(&hwif->gendev_rel_comp);
1188
1189         hwif->tp_ops = &default_tp_ops;
1190
1191         ide_port_init_devices_data(hwif);
1192 }
1193
1194 static void ide_init_port_hw(ide_hwif_t *hwif, struct ide_hw *hw)
1195 {
1196         memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
1197         hwif->irq = hw->irq;
1198         hwif->dev = hw->dev;
1199         hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
1200         hwif->config_data = hw->config;
1201 }
1202
1203 static unsigned int ide_indexes;
1204
1205 /**
1206  *      ide_find_port_slot      -       find free port slot
1207  *      @d: IDE port info
1208  *
1209  *      Return the new port slot index or -ENOENT if we are out of free slots.
1210  */
1211
1212 static int ide_find_port_slot(const struct ide_port_info *d)
1213 {
1214         int idx = -ENOENT;
1215         u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1216         u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;
1217
1218         /*
1219          * Claim an unassigned slot.
1220          *
1221          * Give preference to claiming other slots before claiming ide0/ide1,
1222          * just in case there's another interface yet-to-be-scanned
1223          * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1224          *
1225          * Unless there is a bootable card that does not use the standard
1226          * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1227          */
1228         mutex_lock(&ide_cfg_mtx);
1229         if (bootable) {
1230                 if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1231                         idx = ffz(ide_indexes | i);
1232         } else {
1233                 if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1234                         idx = ffz(ide_indexes | 3);
1235                 else if ((ide_indexes & 3) != 3)
1236                         idx = ffz(ide_indexes);
1237         }
1238         if (idx >= 0)
1239                 ide_indexes |= (1 << idx);
1240         mutex_unlock(&ide_cfg_mtx);
1241
1242         return idx;
1243 }
1244
1245 static void ide_free_port_slot(int idx)
1246 {
1247         mutex_lock(&ide_cfg_mtx);
1248         ide_indexes &= ~(1 << idx);
1249         mutex_unlock(&ide_cfg_mtx);
1250 }
1251
1252 static void ide_port_free_devices(ide_hwif_t *hwif)
1253 {
1254         ide_drive_t *drive;
1255         int i;
1256
1257         ide_port_for_each_dev(i, drive, hwif) {
1258                 kfree(drive->sense_rq);
1259                 kfree(drive->id);
1260                 kfree(drive);
1261         }
1262 }
1263
1264 static int ide_port_alloc_devices(ide_hwif_t *hwif, int node)
1265 {
1266         ide_drive_t *drive;
1267         int i;
1268
1269         for (i = 0; i < MAX_DRIVES; i++) {
1270                 drive = kzalloc_node(sizeof(*drive), GFP_KERNEL, node);
1271                 if (drive == NULL)
1272                         goto out_nomem;
1273
1274                 /*
1275                  * In order to keep things simple we have an id
1276                  * block for all drives at all times. If the device
1277                  * is pre ATA or refuses ATA/ATAPI identify we
1278                  * will add faked data to this.
1279                  *
1280                  * Also note that 0 everywhere means "can't do X"
1281                  */
1282                 drive->id = kzalloc_node(SECTOR_SIZE, GFP_KERNEL, node);
1283                 if (drive->id == NULL)
1284                         goto out_free_drive;
1285
1286                 drive->sense_rq = kmalloc(sizeof(struct request) +
1287                                 sizeof(struct ide_request), GFP_KERNEL);
1288                 if (!drive->sense_rq)
1289                         goto out_free_id;
1290
1291                 hwif->devices[i] = drive;
1292         }
1293         return 0;
1294
1295 out_free_id:
1296         kfree(drive->id);
1297 out_free_drive:
1298         kfree(drive);
1299 out_nomem:
1300         ide_port_free_devices(hwif);
1301         return -ENOMEM;
1302 }
1303
1304 struct ide_host *ide_host_alloc(const struct ide_port_info *d,
1305                                 struct ide_hw **hws, unsigned int n_ports)
1306 {
1307         struct ide_host *host;
1308         struct device *dev = hws[0] ? hws[0]->dev : NULL;
1309         int node = dev ? dev_to_node(dev) : -1;
1310         int i;
1311
1312         host = kzalloc_node(sizeof(*host), GFP_KERNEL, node);
1313         if (host == NULL)
1314                 return NULL;
1315
1316         for (i = 0; i < n_ports; i++) {
1317                 ide_hwif_t *hwif;
1318                 int idx;
1319
1320                 if (hws[i] == NULL)
1321                         continue;
1322
1323                 hwif = kzalloc_node(sizeof(*hwif), GFP_KERNEL, node);
1324                 if (hwif == NULL)
1325                         continue;
1326
1327                 if (ide_port_alloc_devices(hwif, node) < 0) {
1328                         kfree(hwif);
1329                         continue;
1330                 }
1331
1332                 idx = ide_find_port_slot(d);
1333                 if (idx < 0) {
1334                         printk(KERN_ERR "%s: no free slot for interface\n",
1335                                         d ? d->name : "ide");
1336                         ide_port_free_devices(hwif);
1337                         kfree(hwif);
1338                         continue;
1339                 }
1340
1341                 ide_init_port_data(hwif, idx);
1342
1343                 hwif->host = host;
1344
1345                 host->ports[i] = hwif;
1346                 host->n_ports++;
1347         }
1348
1349         if (host->n_ports == 0) {
1350                 kfree(host);
1351                 return NULL;
1352         }
1353
1354         host->dev[0] = dev;
1355
1356         if (d) {
1357                 host->init_chipset = d->init_chipset;
1358                 host->get_lock     = d->get_lock;
1359                 host->release_lock = d->release_lock;
1360                 host->host_flags = d->host_flags;
1361                 host->irq_flags = d->irq_flags;
1362         }
1363
1364         return host;
1365 }
1366 EXPORT_SYMBOL_GPL(ide_host_alloc);
1367
1368 static void ide_port_free(ide_hwif_t *hwif)
1369 {
1370         ide_port_free_devices(hwif);
1371         ide_free_port_slot(hwif->index);
1372         kfree(hwif);
1373 }
1374
1375 static void ide_disable_port(ide_hwif_t *hwif)
1376 {
1377         struct ide_host *host = hwif->host;
1378         int i;
1379
1380         printk(KERN_INFO "%s: disabling port\n", hwif->name);
1381
1382         for (i = 0; i < MAX_HOST_PORTS; i++) {
1383                 if (host->ports[i] == hwif) {
1384                         host->ports[i] = NULL;
1385                         host->n_ports--;
1386                 }
1387         }
1388
1389         ide_port_free(hwif);
1390 }
1391
1392 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1393                       struct ide_hw **hws)
1394 {
1395         ide_hwif_t *hwif, *mate = NULL;
1396         int i, j = 0;
1397
1398         ide_host_for_each_port(i, hwif, host) {
1399                 if (hwif == NULL) {
1400                         mate = NULL;
1401                         continue;
1402                 }
1403
1404                 ide_init_port_hw(hwif, hws[i]);
1405                 ide_port_apply_params(hwif);
1406
1407                 if ((i & 1) && mate) {
1408                         hwif->mate = mate;
1409                         mate->mate = hwif;
1410                 }
1411
1412                 mate = (i & 1) ? NULL : hwif;
1413
1414                 ide_init_port(hwif, i & 1, d);
1415                 ide_port_cable_detect(hwif);
1416
1417                 hwif->port_flags |= IDE_PFLAG_PROBING;
1418
1419                 ide_port_init_devices(hwif);
1420         }
1421
1422         ide_host_for_each_port(i, hwif, host) {
1423                 if (hwif == NULL)
1424                         continue;
1425
1426                 if (ide_probe_port(hwif) == 0)
1427                         hwif->present = 1;
1428
1429                 hwif->port_flags &= ~IDE_PFLAG_PROBING;
1430
1431                 if ((hwif->host_flags & IDE_HFLAG_4DRIVES) == 0 ||
1432                     hwif->mate == NULL || hwif->mate->present == 0) {
1433                         if (ide_register_port(hwif)) {
1434                                 ide_disable_port(hwif);
1435                                 continue;
1436                         }
1437                 }
1438
1439                 if (hwif->present)
1440                         ide_port_tune_devices(hwif);
1441         }
1442
1443         ide_host_enable_irqs(host);
1444
1445         ide_host_for_each_port(i, hwif, host) {
1446                 if (hwif == NULL)
1447                         continue;
1448
1449                 if (hwif_init(hwif) == 0) {
1450                         printk(KERN_INFO "%s: failed to initialize IDE "
1451                                          "interface\n", hwif->name);
1452                         device_unregister(hwif->portdev);
1453                         device_unregister(&hwif->gendev);
1454                         ide_disable_port(hwif);
1455                         continue;
1456                 }
1457
1458                 if (hwif->present)
1459                         if (ide_port_setup_devices(hwif) == 0) {
1460                                 hwif->present = 0;
1461                                 continue;
1462                         }
1463
1464                 j++;
1465
1466                 ide_acpi_init_port(hwif);
1467
1468                 if (hwif->present)
1469                         ide_acpi_port_init_devices(hwif);
1470         }
1471
1472         ide_host_for_each_port(i, hwif, host) {
1473                 if (hwif == NULL)
1474                         continue;
1475
1476                 ide_sysfs_register_port(hwif);
1477                 ide_proc_register_port(hwif);
1478
1479                 if (hwif->present) {
1480                         ide_proc_port_register_devices(hwif);
1481                         hwif_register_devices(hwif);
1482                 }
1483         }
1484
1485         return j ? 0 : -1;
1486 }
1487 EXPORT_SYMBOL_GPL(ide_host_register);
1488
1489 int ide_host_add(const struct ide_port_info *d, struct ide_hw **hws,
1490                  unsigned int n_ports, struct ide_host **hostp)
1491 {
1492         struct ide_host *host;
1493         int rc;
1494
1495         host = ide_host_alloc(d, hws, n_ports);
1496         if (host == NULL)
1497                 return -ENOMEM;
1498
1499         rc = ide_host_register(host, d, hws);
1500         if (rc) {
1501                 ide_host_free(host);
1502                 return rc;
1503         }
1504
1505         if (hostp)
1506                 *hostp = host;
1507
1508         return 0;
1509 }
1510 EXPORT_SYMBOL_GPL(ide_host_add);
1511
1512 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
1513 {
1514         ide_drive_t *drive;
1515         int i;
1516
1517         ide_port_for_each_present_dev(i, drive, hwif) {
1518                 device_unregister(&drive->gendev);
1519                 wait_for_completion(&drive->gendev_rel_comp);
1520         }
1521 }
1522
1523 void ide_port_unregister_devices(ide_hwif_t *hwif)
1524 {
1525         mutex_lock(&ide_cfg_mtx);
1526         __ide_port_unregister_devices(hwif);
1527         hwif->present = 0;
1528         ide_port_init_devices_data(hwif);
1529         mutex_unlock(&ide_cfg_mtx);
1530 }
1531 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
1532
1533 /**
1534  *      ide_unregister          -       free an IDE interface
1535  *      @hwif: IDE interface
1536  *
1537  *      Perform the final unregister of an IDE interface.
1538  *
1539  *      Locking:
1540  *      The caller must not hold the IDE locks.
1541  *
1542  *      It is up to the caller to be sure there is no pending I/O here,
1543  *      and that the interface will not be reopened (present/vanishing
1544  *      locking isn't yet done BTW).
1545  */
1546
1547 static void ide_unregister(ide_hwif_t *hwif)
1548 {
1549         BUG_ON(in_interrupt());
1550         BUG_ON(irqs_disabled());
1551
1552         mutex_lock(&ide_cfg_mtx);
1553
1554         if (hwif->present) {
1555                 __ide_port_unregister_devices(hwif);
1556                 hwif->present = 0;
1557         }
1558
1559         ide_proc_unregister_port(hwif);
1560
1561         if (!hwif->host->get_lock)
1562                 free_irq(hwif->irq, hwif);
1563
1564         device_unregister(hwif->portdev);
1565         device_unregister(&hwif->gendev);
1566         wait_for_completion(&hwif->gendev_rel_comp);
1567
1568         /*
1569          * Remove us from the kernel's knowledge
1570          */
1571         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
1572         kfree(hwif->sg_table);
1573         unregister_blkdev(hwif->major, hwif->name);
1574
1575         ide_release_dma_engine(hwif);
1576
1577         mutex_unlock(&ide_cfg_mtx);
1578 }
1579
1580 void ide_host_free(struct ide_host *host)
1581 {
1582         ide_hwif_t *hwif;
1583         int i;
1584
1585         ide_host_for_each_port(i, hwif, host) {
1586                 if (hwif)
1587                         ide_port_free(hwif);
1588         }
1589
1590         kfree(host);
1591 }
1592 EXPORT_SYMBOL_GPL(ide_host_free);
1593
1594 void ide_host_remove(struct ide_host *host)
1595 {
1596         ide_hwif_t *hwif;
1597         int i;
1598
1599         ide_host_for_each_port(i, hwif, host) {
1600                 if (hwif)
1601                         ide_unregister(hwif);
1602         }
1603
1604         ide_host_free(host);
1605 }
1606 EXPORT_SYMBOL_GPL(ide_host_remove);
1607
1608 void ide_port_scan(ide_hwif_t *hwif)
1609 {
1610         int rc;
1611
1612         ide_port_apply_params(hwif);
1613         ide_port_cable_detect(hwif);
1614
1615         hwif->port_flags |= IDE_PFLAG_PROBING;
1616
1617         ide_port_init_devices(hwif);
1618
1619         rc = ide_probe_port(hwif);
1620
1621         hwif->port_flags &= ~IDE_PFLAG_PROBING;
1622
1623         if (rc < 0)
1624                 return;
1625
1626         hwif->present = 1;
1627
1628         ide_port_tune_devices(hwif);
1629         ide_port_setup_devices(hwif);
1630         ide_acpi_port_init_devices(hwif);
1631         hwif_register_devices(hwif);
1632         ide_proc_port_register_devices(hwif);
1633 }
1634 EXPORT_SYMBOL_GPL(ide_port_scan);