drivers/ide/ide-probe.c

   1 /*
   2  *  Copyright (C) 1994-1998   Linus Torvalds & authors (see below)
   3  *  Copyright (C) 2005, 2007  Bartlomiej Zolnierkiewicz
   4  */
   5
   6 /*
   7  *  Mostly written by Mark Lord <mlord@pobox.com>
   8  *                and Gadi Oxman <gadio@netvision.net.il>
   9  *                and Andre Hedrick <andre@linux-ide.org>
  10  *
  11  *  See linux/MAINTAINERS for address of current maintainer.
  12  *
  13  * This is the IDE probe module, as evolved from hd.c and ide.c.
  14  *
  15  * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
  16  *       by Andrea Arcangeli
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/types.h>
  21 #include <linux/string.h>
  22 #include <linux/kernel.h>
  23 #include <linux/timer.h>
  24 #include <linux/mm.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/major.h>
  27 #include <linux/errno.h>
  28 #include <linux/genhd.h>
  29 #include <linux/slab.h>
  30 #include <linux/delay.h>
  31 #include <linux/ide.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/kmod.h>
  34 #include <linux/pci.h>
  35 #include <linux/scatterlist.h>
  36
  37 #include <asm/byteorder.h>
  38 #include <asm/irq.h>
  39 #include <asm/uaccess.h>
  40 #include <asm/io.h>
  41
  42 /**
  43  *      generic_id              -       add a generic drive id
  44  *      @drive: drive to make an ID block for
  45  *
  46  *      Add a fake id field to the drive we are passed. This allows
  47  *      use to skip a ton of NULL checks (which people always miss)
  48  *      and make drive properties unconditional outside of this file
  49  */
  50
  51 static void generic_id(ide_drive_t *drive)
  52 {
  53         u16 *id = drive->id;
  54
  55         id[ATA_ID_CUR_CYLS]     = id[ATA_ID_CYLS]       = drive->cyl;
  56         id[ATA_ID_CUR_HEADS]    = id[ATA_ID_HEADS]      = drive->head;
  57         id[ATA_ID_CUR_SECTORS]  = id[ATA_ID_SECTORS]    = drive->sect;
  58 }
  59
  60 static void ide_disk_init_chs(ide_drive_t *drive)
  61 {
  62         u16 *id = drive->id;
  63
  64         /* Extract geometry if we did not already have one for the drive */
  65         if (!drive->cyl || !drive->head || !drive->sect) {
  66                 drive->cyl  = drive->bios_cyl  = id[ATA_ID_CYLS];
  67                 drive->head = drive->bios_head = id[ATA_ID_HEADS];
  68                 drive->sect = drive->bios_sect = id[ATA_ID_SECTORS];
  69         }
  70
  71         /* Handle logical geometry translation by the drive */
  72         if (ata_id_current_chs_valid(id)) {
  73                 drive->cyl  = id[ATA_ID_CUR_CYLS];
  74                 drive->head = id[ATA_ID_CUR_HEADS];
  75                 drive->sect = id[ATA_ID_CUR_SECTORS];
  76         }
  77
  78         /* Use physical geometry if what we have still makes no sense */
  79         if (drive->head > 16 && id[ATA_ID_HEADS] && id[ATA_ID_HEADS] <= 16) {
  80                 drive->cyl  = id[ATA_ID_CYLS];
  81                 drive->head = id[ATA_ID_HEADS];
  82                 drive->sect = id[ATA_ID_SECTORS];
  83         }
  84 }
  85
  86 static void ide_disk_init_mult_count(ide_drive_t *drive)
  87 {
  88         u16 *id = drive->id;
  89         u8 max_multsect = id[ATA_ID_MAX_MULTSECT] & 0xff;
  90
  91         if (max_multsect) {
  92                 if ((max_multsect / 2) > 1)
  93                         id[ATA_ID_MULTSECT] = max_multsect | 0x100;
  94                 else
  95                         id[ATA_ID_MULTSECT] &= ~0x1ff;
  96
  97                 drive->mult_req = id[ATA_ID_MULTSECT] & 0xff;
  98
  99                 if (drive->mult_req)
 100                         drive->special.b.set_multmode = 1;
 101         }
 102 }
 103
 104 /**
 105  *      do_identify     -       identify a drive
 106  *      @drive: drive to identify
 107  *      @cmd: command used
 108  *
 109  *      Called when we have issued a drive identify command to
 110  *      read and parse the results. This function is run with
 111  *      interrupts disabled.
 112  */
 113
 114 static inline void do_identify (ide_drive_t *drive, u8 cmd)
 115 {
 116         ide_hwif_t *hwif = HWIF(drive);
 117         u16 *id = drive->id;
 118         char *m = (char *)&id[ATA_ID_PROD];
 119         int bswap = 1, is_cfa;
 120
 121         /* read 512 bytes of id info */
 122         hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
 123
 124         drive->id_read = 1;
 125         local_irq_enable();
 126 #ifdef DEBUG
 127         printk(KERN_INFO "%s: dumping identify data\n", drive->name);
 128         ide_dump_identify((u8 *)id);
 129 #endif
 130         ide_fix_driveid(id);
 131
 132         /*
 133          *  ATA_CMD_ID_ATA returns little-endian info,
 134          *  ATA_CMD_ID_ATAPI *usually* returns little-endian info.
 135          */
 136         if (cmd == ATA_CMD_ID_ATAPI) {
 137                 if ((m[0] == 'N' && m[1] == 'E') ||  /* NEC */
 138                     (m[0] == 'F' && m[1] == 'X') ||  /* Mitsumi */
 139                     (m[0] == 'P' && m[1] == 'i'))    /* Pioneer */
 140                         /* Vertos drives may still be weird */
 141                         bswap ^= 1;
 142         }
 143
 144         ide_fixstring(m, ATA_ID_PROD_LEN, bswap);
 145         ide_fixstring((char *)&id[ATA_ID_FW_REV], ATA_ID_FW_REV_LEN, bswap);
 146         ide_fixstring((char *)&id[ATA_ID_SERNO], ATA_ID_SERNO_LEN, bswap);
 147
 148         /* we depend on this a lot! */
 149         m[ATA_ID_PROD_LEN - 1] = '\0';
 150
 151         if (strstr(m, "E X A B Y T E N E S T"))
 152                 goto err_misc;
 153
 154         printk(KERN_INFO "%s: %s, ", drive->name, m);
 155
 156         drive->present = 1;
 157         drive->dead = 0;
 158
 159         /*
 160          * Check for an ATAPI device
 161          */
 162         if (cmd == ATA_CMD_ID_ATAPI) {
 163                 u8 type = (id[ATA_ID_CONFIG] >> 8) & 0x1f;
 164
 165                 printk(KERN_CONT "ATAPI ");
 166                 switch (type) {
 167                         case ide_floppy:
 168                                 if (!strstr(m, "CD-ROM")) {
 169                                         if (!strstr(m, "oppy") &&
 170                                             !strstr(m, "poyp") &&
 171                                             !strstr(m, "ZIP"))
 172                                                 printk(KERN_CONT "cdrom or floppy?, assuming ");
 173                                         if (drive->media != ide_cdrom) {
 174                                                 printk(KERN_CONT "FLOPPY");
 175                                                 drive->removable = 1;
 176                                                 break;
 177                                         }
 178                                 }
 179                                 /* Early cdrom models used zero */
 180                                 type = ide_cdrom;
 181                         case ide_cdrom:
 182                                 drive->removable = 1;
 183 #ifdef CONFIG_PPC
 184                                 /* kludge for Apple PowerBook internal zip */
 185                                 if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) {
 186                                         printk(KERN_CONT "FLOPPY");
 187                                         type = ide_floppy;
 188                                         break;
 189                                 }
 190 #endif
 191                                 printk(KERN_CONT "CD/DVD-ROM");
 192                                 break;
 193                         case ide_tape:
 194                                 printk(KERN_CONT "TAPE");
 195                                 break;
 196                         case ide_optical:
 197                                 printk(KERN_CONT "OPTICAL");
 198                                 drive->removable = 1;
 199                                 break;
 200                         default:
 201                                 printk(KERN_CONT "UNKNOWN (type %d)", type);
 202                                 break;
 203                 }
 204                 printk(KERN_CONT " drive\n");
 205                 drive->media = type;
 206                 /* an ATAPI device ignores DRDY */
 207                 drive->ready_stat = 0;
 208                 return;
 209         }
 210
 211         /*
 212          * Not an ATAPI device: looks like a "regular" hard disk
 213          */
 214
 215         is_cfa = ata_id_is_cfa(id);
 216
 217         /* CF devices are *not* removable in Linux definition of the term */
 218         if (is_cfa == 0 && (id[ATA_ID_CONFIG] & (1 << 7)))
 219                 drive->removable = 1;
 220
 221         drive->media = ide_disk;
 222
 223         printk(KERN_CONT "%s DISK drive\n", is_cfa ? "CFA" : "ATA");
 224
 225         return;
 226
 227 err_misc:
 228         kfree(id);
 229         drive->present = 0;
 230         return;
 231 }
 232
 233 /**
 234  *      actual_try_to_identify  -       send ata/atapi identify
 235  *      @drive: drive to identify
 236  *      @cmd: command to use
 237  *
 238  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 239  *      and waits for a response.  It also monitors irqs while this is
 240  *      happening, in hope of automatically determining which one is
 241  *      being used by the interface.
 242  *
 243  *      Returns:        0  device was identified
 244  *                      1  device timed-out (no response to identify request)
 245  *                      2  device aborted the command (refused to identify itself)
 246  */
 247
 248 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 249 {
 250         ide_hwif_t *hwif = HWIF(drive);
 251         struct ide_io_ports *io_ports = &hwif->io_ports;
 252         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 253         int use_altstatus = 0, rc;
 254         unsigned long timeout;
 255         u8 s = 0, a = 0;
 256
 257         /* take a deep breath */
 258         msleep(50);
 259
 260         if (io_ports->ctl_addr) {
 261                 a = tp_ops->read_altstatus(hwif);
 262                 s = tp_ops->read_status(hwif);
 263                 if ((a ^ s) & ~ATA_IDX)
 264                         /* ancient Seagate drives, broken interfaces */
 265                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
 266                                          "instead of ALTSTATUS(0x%02x)\n",
 267                                          drive->name, s, a);
 268                 else
 269                         /* use non-intrusive polling */
 270                         use_altstatus = 1;
 271         }
 272
 273         /* set features register for atapi
 274          * identify command to be sure of reply
 275          */
 276         if (cmd == ATA_CMD_ID_ATAPI) {
 277                 ide_task_t task;
 278
 279                 memset(&task, 0, sizeof(task));
 280                 /* disable DMA & overlap */
 281                 task.tf_flags = IDE_TFLAG_OUT_FEATURE;
 282
 283                 tp_ops->tf_load(drive, &task);
 284         }
 285
 286         /* ask drive for ID */
 287         tp_ops->exec_command(hwif, cmd);
 288
 289         timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 290
 291         if (ide_busy_sleep(hwif, timeout, use_altstatus))
 292                 return 1;
 293
 294         /* wait for IRQ and ATA_DRQ */
 295         msleep(50);
 296         s = tp_ops->read_status(hwif);
 297
 298         if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
 299                 unsigned long flags;
 300
 301                 /* local CPU only; some systems need this */
 302                 local_irq_save(flags);
 303                 /* drive returned ID */
 304                 do_identify(drive, cmd);
 305                 /* drive responded with ID */
 306                 rc = 0;
 307                 /* clear drive IRQ */
 308                 (void)tp_ops->read_status(hwif);
 309                 local_irq_restore(flags);
 310         } else {
 311                 /* drive refused ID */
 312                 rc = 2;
 313         }
 314         return rc;
 315 }
 316
 317 /**
 318  *      try_to_identify -       try to identify a drive
 319  *      @drive: drive to probe
 320  *      @cmd: command to use
 321  *
 322  *      Issue the identify command and then do IRQ probing to
 323  *      complete the identification when needed by finding the
 324  *      IRQ the drive is attached to
 325  */
 326
 327 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 328 {
 329         ide_hwif_t *hwif = HWIF(drive);
 330         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 331         int retval;
 332         int autoprobe = 0;
 333         unsigned long cookie = 0;
 334
 335         /*
 336          * Disable device irq unless we need to
 337          * probe for it. Otherwise we'll get spurious
 338          * interrupts during the identify-phase that
 339          * the irq handler isn't expecting.
 340          */
 341         if (hwif->io_ports.ctl_addr) {
 342                 if (!hwif->irq) {
 343                         autoprobe = 1;
 344                         cookie = probe_irq_on();
 345                 }
 346                 tp_ops->set_irq(hwif, autoprobe);
 347         }
 348
 349         retval = actual_try_to_identify(drive, cmd);
 350
 351         if (autoprobe) {
 352                 int irq;
 353
 354                 tp_ops->set_irq(hwif, 0);
 355                 /* clear drive IRQ */
 356                 (void)tp_ops->read_status(hwif);
 357                 udelay(5);
 358                 irq = probe_irq_off(cookie);
 359                 if (!hwif->irq) {
 360                         if (irq > 0) {
 361                                 hwif->irq = irq;
 362                         } else {
 363                                 /* Mmmm.. multiple IRQs..
 364                                  * don't know which was ours
 365                                  */
 366                                 printk(KERN_ERR "%s: IRQ probe failed (0x%lx)\n",
 367                                         drive->name, cookie);
 368                         }
 369                 }
 370         }
 371         return retval;
 372 }
 373
 374 int ide_busy_sleep(ide_hwif_t *hwif, unsigned long timeout, int altstatus)
 375 {
 376         u8 stat;
 377
 378         timeout += jiffies;
 379
 380         do {
 381                 msleep(50);     /* give drive a breather */
 382                 stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
 383                                  : hwif->tp_ops->read_status(hwif);
 384                 if ((stat & ATA_BUSY) == 0)
 385                         return 0;
 386         } while (time_before(jiffies, timeout));
 387
 388         return 1;       /* drive timed-out */
 389 }
 390
 391 static u8 ide_read_device(ide_drive_t *drive)
 392 {
 393         ide_task_t task;
 394
 395         memset(&task, 0, sizeof(task));
 396         task.tf_flags = IDE_TFLAG_IN_DEVICE;
 397
 398         drive->hwif->tp_ops->tf_read(drive, &task);
 399
 400         return task.tf.device;
 401 }
 402
 403 /**
 404  *      do_probe                -       probe an IDE device
 405  *      @drive: drive to probe
 406  *      @cmd: command to use
 407  *
 408  *      do_probe() has the difficult job of finding a drive if it exists,
 409  *      without getting hung up if it doesn't exist, without trampling on
 410  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 411  *
 412  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 413  *      but does not respond right away, the probe will "hang in there"
 414  *      for the maximum wait time (about 30 seconds), otherwise it will
 415  *      exit much more quickly.
 416  *
 417  * Returns:     0  device was identified
 418  *              1  device timed-out (no response to identify request)
 419  *              2  device aborted the command (refused to identify itself)
 420  *              3  bad status from device (possible for ATAPI drives)
 421  *              4  probe was not attempted because failure was obvious
 422  */
 423
 424 static int do_probe (ide_drive_t *drive, u8 cmd)
 425 {
 426         ide_hwif_t *hwif = HWIF(drive);
 427         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 428         int rc;
 429         u8 stat;
 430
 431         if (drive->present) {
 432                 /* avoid waiting for inappropriate probes */
 433                 if (drive->media != ide_disk && cmd == ATA_CMD_ID_ATA)
 434                         return 4;
 435         }
 436 #ifdef DEBUG
 437         printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
 438                 drive->name, drive->present, drive->media,
 439                 (cmd == ATA_CMD_ID_ATA) ? "ATA" : "ATAPI");
 440 #endif
 441
 442         /* needed for some systems
 443          * (e.g. crw9624 as drive0 with disk as slave)
 444          */
 445         msleep(50);
 446         SELECT_DRIVE(drive);
 447         msleep(50);
 448
 449         if (ide_read_device(drive) != drive->select.all && !drive->present) {
 450                 if (drive->select.b.unit != 0) {
 451                         /* exit with drive0 selected */
 452                         SELECT_DRIVE(&hwif->drives[0]);
 453                         /* allow ATA_BUSY to assert & clear */
 454                         msleep(50);
 455                 }
 456                 /* no i/f present: mmm.. this should be a 4 -ml */
 457                 return 3;
 458         }
 459
 460         stat = tp_ops->read_status(hwif);
 461
 462         if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) ||
 463             drive->present || cmd == ATA_CMD_ID_ATAPI) {
 464                 /* send cmd and wait */
 465                 if ((rc = try_to_identify(drive, cmd))) {
 466                         /* failed: try again */
 467                         rc = try_to_identify(drive,cmd);
 468                 }
 469
 470                 stat = tp_ops->read_status(hwif);
 471
 472                 if (stat == (ATA_BUSY | ATA_DRDY))
 473                         return 4;
 474
 475                 if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) {
 476                         printk(KERN_ERR "%s: no response (status = 0x%02x), "
 477                                         "resetting drive\n", drive->name, stat);
 478                         msleep(50);
 479                         SELECT_DRIVE(drive);
 480                         msleep(50);
 481                         tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
 482                         (void)ide_busy_sleep(hwif, WAIT_WORSTCASE, 0);
 483                         rc = try_to_identify(drive, cmd);
 484                 }
 485
 486                 /* ensure drive IRQ is clear */
 487                 stat = tp_ops->read_status(hwif);
 488
 489                 if (rc == 1)
 490                         printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
 491                                         drive->name, stat);
 492         } else {
 493                 /* not present or maybe ATAPI */
 494                 rc = 3;
 495         }
 496         if (drive->select.b.unit != 0) {
 497                 /* exit with drive0 selected */
 498                 SELECT_DRIVE(&hwif->drives[0]);
 499                 msleep(50);
 500                 /* ensure drive irq is clear */
 501                 (void)tp_ops->read_status(hwif);
 502         }
 503         return rc;
 504 }
 505
 506 /*
 507  *
 508  */
 509 static void enable_nest (ide_drive_t *drive)
 510 {
 511         ide_hwif_t *hwif = HWIF(drive);
 512         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 513         u8 stat;
 514
 515         printk(KERN_INFO "%s: enabling %s -- ",
 516                 hwif->name, (char *)&drive->id[ATA_ID_PROD]);
 517
 518         SELECT_DRIVE(drive);
 519         msleep(50);
 520         tp_ops->exec_command(hwif, ATA_EXABYTE_ENABLE_NEST);
 521
 522         if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 0)) {
 523                 printk(KERN_CONT "failed (timeout)\n");
 524                 return;
 525         }
 526
 527         msleep(50);
 528
 529         stat = tp_ops->read_status(hwif);
 530
 531         if (!OK_STAT(stat, 0, BAD_STAT))
 532                 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
 533         else
 534                 printk(KERN_CONT "success\n");
 535 }
 536
 537 /**
 538  *      probe_for_drives        -       upper level drive probe
 539  *      @drive: drive to probe for
 540  *
 541  *      probe_for_drive() tests for existence of a given drive using do_probe()
 542  *      and presents things to the user as needed.
 543  *
 544  *      Returns:        0  no device was found
 545  *                      1  device was found (note: drive->present might
 546  *                         still be 0)
 547  */
 548
 549 static inline u8 probe_for_drive (ide_drive_t *drive)
 550 {
 551         char *m;
 552
 553         /*
 554          *      In order to keep things simple we have an id
 555          *      block for all drives at all times. If the device
 556          *      is pre ATA or refuses ATA/ATAPI identify we
 557          *      will add faked data to this.
 558          *
 559          *      Also note that 0 everywhere means "can't do X"
 560          */
 561
 562         drive->id = kzalloc(SECTOR_SIZE, GFP_KERNEL);
 563         drive->id_read = 0;
 564         if(drive->id == NULL)
 565         {
 566                 printk(KERN_ERR "ide: out of memory for id data.\n");
 567                 return 0;
 568         }
 569
 570         m = (char *)&drive->id[ATA_ID_PROD];
 571         strcpy(m, "UNKNOWN");
 572
 573         /* skip probing? */
 574         if (!drive->noprobe) {
 575 retry:
 576                 /* if !(success||timed-out) */
 577                 if (do_probe(drive, ATA_CMD_ID_ATA) >= 2)
 578                         /* look for ATAPI device */
 579                         (void)do_probe(drive, ATA_CMD_ID_ATAPI);
 580
 581                 if (!drive->present)
 582                         /* drive not found */
 583                         return 0;
 584
 585                 if (strstr(m, "E X A B Y T E N E S T")) {
 586                         enable_nest(drive);
 587                         goto retry;
 588                 }
 589
 590                 /* identification failed? */
 591                 if (!drive->id_read) {
 592                         if (drive->media == ide_disk) {
 593                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 594                                         drive->name, drive->cyl,
 595                                         drive->head, drive->sect);
 596                         } else if (drive->media == ide_cdrom) {
 597                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 598                         } else {
 599                                 /* nuke it */
 600                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 601                                 drive->present = 0;
 602                         }
 603                 }
 604                 /* drive was found */
 605         }
 606         if(!drive->present)
 607                 return 0;
 608         /* The drive wasn't being helpful. Add generic info only */
 609         if (drive->id_read == 0) {
 610                 generic_id(drive);
 611                 return 1;
 612         }
 613
 614         if (drive->media == ide_disk) {
 615                 ide_disk_init_chs(drive);
 616                 ide_disk_init_mult_count(drive);
 617         }
 618
 619         return drive->present;
 620 }
 621
 622 static void hwif_release_dev(struct device *dev)
 623 {
 624         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 625
 626         complete(&hwif->gendev_rel_comp);
 627 }
 628
 629 static int ide_register_port(ide_hwif_t *hwif)
 630 {
 631         int ret;
 632
 633         /* register with global device tree */
 634         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 635         hwif->gendev.driver_data = hwif;
 636         if (hwif->gendev.parent == NULL) {
 637                 if (hwif->dev)
 638                         hwif->gendev.parent = hwif->dev;
 639                 else
 640                         /* Would like to do = &device_legacy */
 641                         hwif->gendev.parent = NULL;
 642         }
 643         hwif->gendev.release = hwif_release_dev;
 644         ret = device_register(&hwif->gendev);
 645         if (ret < 0) {
 646                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
 647                         __func__, ret);
 648                 goto out;
 649         }
 650
 651         hwif->portdev = device_create_drvdata(ide_port_class, &hwif->gendev,
 652                                               MKDEV(0, 0), hwif, hwif->name);
 653         if (IS_ERR(hwif->portdev)) {
 654                 ret = PTR_ERR(hwif->portdev);
 655                 device_unregister(&hwif->gendev);
 656         }
 657 out:
 658         return ret;
 659 }
 660
 661 /**
 662  *      ide_port_wait_ready     -       wait for port to become ready
 663  *      @hwif: IDE port
 664  *
 665  *      This is needed on some PPCs and a bunch of BIOS-less embedded
 666  *      platforms.  Typical cases are:
 667  *
 668  *      - The firmware hard reset the disk before booting the kernel,
 669  *        the drive is still doing it's poweron-reset sequence, that
 670  *        can take up to 30 seconds.
 671  *
 672  *      - The firmware does nothing (or no firmware), the device is
 673  *        still in POST state (same as above actually).
 674  *
 675  *      - Some CD/DVD/Writer combo drives tend to drive the bus during
 676  *        their reset sequence even when they are non-selected slave
 677  *        devices, thus preventing discovery of the main HD.
 678  *
 679  *      Doing this wait-for-non-busy should not harm any existing
 680  *      configuration and fix some issues like the above.
 681  *
 682  *      BenH.
 683  *
 684  *      Returns 0 on success, error code (< 0) otherwise.
 685  */
 686
 687 static int ide_port_wait_ready(ide_hwif_t *hwif)
 688 {
 689         int unit, rc;
 690
 691         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 692
 693         /* Let HW settle down a bit from whatever init state we
 694          * come from */
 695         mdelay(2);
 696
 697         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 698          * I know of at least one disk who takes 31 seconds, I use 35
 699          * here to be safe
 700          */
 701         rc = ide_wait_not_busy(hwif, 35000);
 702         if (rc)
 703                 return rc;
 704
 705         /* Now make sure both master & slave are ready */
 706         for (unit = 0; unit < MAX_DRIVES; unit++) {
 707                 ide_drive_t *drive = &hwif->drives[unit];
 708
 709                 /* Ignore disks that we will not probe for later. */
 710                 if (!drive->noprobe || drive->present) {
 711                         SELECT_DRIVE(drive);
 712                         hwif->tp_ops->set_irq(hwif, 1);
 713                         mdelay(2);
 714                         rc = ide_wait_not_busy(hwif, 35000);
 715                         if (rc)
 716                                 goto out;
 717                 } else
 718                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
 719                                           drive->name);
 720         }
 721 out:
 722         /* Exit function with master reselected (let's be sane) */
 723         if (unit)
 724                 SELECT_DRIVE(&hwif->drives[0]);
 725
 726         return rc;
 727 }
 728
 729 /**
 730  *      ide_undecoded_slave     -       look for bad CF adapters
 731  *      @dev1: slave device
 732  *
 733  *      Analyse the drives on the interface and attempt to decide if we
 734  *      have the same drive viewed twice. This occurs with crap CF adapters
 735  *      and PCMCIA sometimes.
 736  */
 737
 738 void ide_undecoded_slave(ide_drive_t *dev1)
 739 {
 740         ide_drive_t *dev0 = &dev1->hwif->drives[0];
 741
 742         if ((dev1->dn & 1) == 0 || dev0->present == 0)
 743                 return;
 744
 745         /* If the models don't match they are not the same product */
 746         if (strcmp((char *)&dev0->id[ATA_ID_PROD],
 747                    (char *)&dev1->id[ATA_ID_PROD]))
 748                 return;
 749
 750         /* Serial numbers do not match */
 751         if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
 752                     (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
 753                 return;
 754
 755         /* No serial number, thankfully very rare for CF */
 756         if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
 757                 return;
 758
 759         /* Appears to be an IDE flash adapter with decode bugs */
 760         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 761
 762         dev1->present = 0;
 763 }
 764
 765 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 766
 767 static int ide_probe_port(ide_hwif_t *hwif)
 768 {
 769         unsigned long flags;
 770         unsigned int irqd;
 771         int unit, rc = -ENODEV;
 772
 773         BUG_ON(hwif->present);
 774
 775         if (hwif->drives[0].noprobe && hwif->drives[1].noprobe)
 776                 return -EACCES;
 777
 778         /*
 779          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 780          * we'll install our IRQ driver much later...
 781          */
 782         irqd = hwif->irq;
 783         if (irqd)
 784                 disable_irq(hwif->irq);
 785
 786         local_irq_set(flags);
 787
 788         if (ide_port_wait_ready(hwif) == -EBUSY)
 789                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 790
 791         /*
 792          * Second drive should only exist if first drive was found,
 793          * but a lot of cdrom drives are configured as single slaves.
 794          */
 795         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 796                 ide_drive_t *drive = &hwif->drives[unit];
 797                 drive->dn = (hwif->channel ? 2 : 0) + unit;
 798                 (void) probe_for_drive(drive);
 799                 if (drive->present)
 800                         rc = 0;
 801         }
 802
 803         local_irq_restore(flags);
 804
 805         /*
 806          * Use cached IRQ number. It might be (and is...) changed by probe
 807          * code above
 808          */
 809         if (irqd)
 810                 enable_irq(irqd);
 811
 812         return rc;
 813 }
 814
 815 static void ide_port_tune_devices(ide_hwif_t *hwif)
 816 {
 817         const struct ide_port_ops *port_ops = hwif->port_ops;
 818         int unit;
 819
 820         for (unit = 0; unit < MAX_DRIVES; unit++) {
 821                 ide_drive_t *drive = &hwif->drives[unit];
 822
 823                 if (drive->present && port_ops && port_ops->quirkproc)
 824                         port_ops->quirkproc(drive);
 825         }
 826
 827         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 828                 ide_drive_t *drive = &hwif->drives[unit];
 829
 830                 if (drive->present) {
 831                         ide_set_max_pio(drive);
 832
 833                         drive->nice1 = 1;
 834
 835                         if (hwif->dma_ops)
 836                                 ide_set_dma(drive);
 837                 }
 838         }
 839
 840         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 841                 ide_drive_t *drive = &hwif->drives[unit];
 842
 843                 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
 844                         drive->no_io_32bit = 1;
 845                 else
 846                         drive->no_io_32bit = drive->id[ATA_ID_DWORD_IO] ? 1 : 0;
 847         }
 848 }
 849
 850 #if MAX_HWIFS > 1
 851 /*
 852  * save_match() is used to simplify logic in init_irq() below.
 853  *
 854  * A loophole here is that we may not know about a particular
 855  * hwif's irq until after that hwif is actually probed/initialized..
 856  * This could be a problem for the case where an hwif is on a
 857  * dual interface that requires serialization (eg. cmd640) and another
 858  * hwif using one of the same irqs is initialized beforehand.
 859  *
 860  * This routine detects and reports such situations, but does not fix them.
 861  */
 862 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 863 {
 864         ide_hwif_t *m = *match;
 865
 866         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 867                 if (!new->hwgroup)
 868                         return;
 869                 printk(KERN_WARNING "%s: potential IRQ problem with %s and %s\n",
 870                         hwif->name, new->name, m->name);
 871         }
 872         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 873                 *match = new;
 874 }
 875 #endif /* MAX_HWIFS > 1 */
 876
 877 /*
 878  * init request queue
 879  */
 880 static int ide_init_queue(ide_drive_t *drive)
 881 {
 882         struct request_queue *q;
 883         ide_hwif_t *hwif = HWIF(drive);
 884         int max_sectors = 256;
 885         int max_sg_entries = PRD_ENTRIES;
 886
 887         /*
 888          *      Our default set up assumes the normal IDE case,
 889          *      that is 64K segmenting, standard PRD setup
 890          *      and LBA28. Some drivers then impose their own
 891          *      limits and LBA48 we could raise it but as yet
 892          *      do not.
 893          */
 894
 895         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
 896         if (!q)
 897                 return 1;
 898
 899         q->queuedata = drive;
 900         blk_queue_segment_boundary(q, 0xffff);
 901
 902         if (hwif->rqsize < max_sectors)
 903                 max_sectors = hwif->rqsize;
 904         blk_queue_max_sectors(q, max_sectors);
 905
 906 #ifdef CONFIG_PCI
 907         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 908          * creates segments that don't completely match our boundary
 909          * requirements and thus need to be broken up again. Because it
 910          * doesn't align properly either, we may actually have to break up
 911          * to more segments than what was we got in the first place, a max
 912          * worst case is twice as many.
 913          * This will be fixed once we teach pci_map_sg() about our boundary
 914          * requirements, hopefully soon. *FIXME*
 915          */
 916         if (!PCI_DMA_BUS_IS_PHYS)
 917                 max_sg_entries >>= 1;
 918 #endif /* CONFIG_PCI */
 919
 920         blk_queue_max_hw_segments(q, max_sg_entries);
 921         blk_queue_max_phys_segments(q, max_sg_entries);
 922
 923         /* assign drive queue */
 924         drive->queue = q;
 925
 926         /* needs drive->queue to be set */
 927         ide_toggle_bounce(drive, 1);
 928
 929         return 0;
 930 }
 931
 932 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
 933 {
 934         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
 935
 936         spin_lock_irq(&ide_lock);
 937         if (!hwgroup->drive) {
 938                 /* first drive for hwgroup. */
 939                 drive->next = drive;
 940                 hwgroup->drive = drive;
 941                 hwgroup->hwif = HWIF(hwgroup->drive);
 942         } else {
 943                 drive->next = hwgroup->drive->next;
 944                 hwgroup->drive->next = drive;
 945         }
 946         spin_unlock_irq(&ide_lock);
 947 }
 948
 949 /*
 950  * For any present drive:
 951  * - allocate the block device queue
 952  * - link drive into the hwgroup
 953  */
 954 static void ide_port_setup_devices(ide_hwif_t *hwif)
 955 {
 956         int i;
 957
 958         mutex_lock(&ide_cfg_mtx);
 959         for (i = 0; i < MAX_DRIVES; i++) {
 960                 ide_drive_t *drive = &hwif->drives[i];
 961
 962                 if (!drive->present)
 963                         continue;
 964
 965                 if (ide_init_queue(drive)) {
 966                         printk(KERN_ERR "ide: failed to init %s\n",
 967                                         drive->name);
 968                         continue;
 969                 }
 970
 971                 ide_add_drive_to_hwgroup(drive);
 972         }
 973         mutex_unlock(&ide_cfg_mtx);
 974 }
 975
 976 static ide_hwif_t *ide_ports[MAX_HWIFS];
 977
 978 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
 979 {
 980         ide_hwgroup_t *hwgroup = hwif->hwgroup;
 981
 982         ide_ports[hwif->index] = NULL;
 983
 984         spin_lock_irq(&ide_lock);
 985         /*
 986          * Remove us from the hwgroup, and free
 987          * the hwgroup if we were the only member
 988          */
 989         if (hwif->next == hwif) {
 990                 BUG_ON(hwgroup->hwif != hwif);
 991                 kfree(hwgroup);
 992         } else {
 993                 /* There is another interface in hwgroup.
 994                  * Unlink us, and set hwgroup->drive and ->hwif to
 995                  * something sane.
 996                  */
 997                 ide_hwif_t *g = hwgroup->hwif;
 998
 999                 while (g->next != hwif)
1000                         g = g->next;
1001                 g->next = hwif->next;
1002                 if (hwgroup->hwif == hwif) {
1003                         /* Chose a random hwif for hwgroup->hwif.
1004                          * It's guaranteed that there are no drives
1005                          * left in the hwgroup.
1006                          */
1007                         BUG_ON(hwgroup->drive != NULL);
1008                         hwgroup->hwif = g;
1009                 }
1010                 BUG_ON(hwgroup->hwif == hwif);
1011         }
1012         spin_unlock_irq(&ide_lock);
1013 }
1014
1015 /*
1016  * This routine sets up the irq for an ide interface, and creates a new
1017  * hwgroup for the irq/hwif if none was previously assigned.
1018  *
1019  * Much of the code is for correctly detecting/handling irq sharing
1020  * and irq serialization situations.  This is somewhat complex because
1021  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1022  */
1023 static int init_irq (ide_hwif_t *hwif)
1024 {
1025         struct ide_io_ports *io_ports = &hwif->io_ports;
1026         unsigned int index;
1027         ide_hwgroup_t *hwgroup;
1028         ide_hwif_t *match = NULL;
1029
1030         mutex_lock(&ide_cfg_mtx);
1031         hwif->hwgroup = NULL;
1032 #if MAX_HWIFS > 1
1033         /*
1034          * Group up with any other hwifs that share our irq(s).
1035          */
1036         for (index = 0; index < MAX_HWIFS; index++) {
1037                 ide_hwif_t *h = ide_ports[index];
1038
1039                 if (h && h->hwgroup) {  /* scan only initialized ports */
1040                         if (hwif->irq == h->irq) {
1041                                 hwif->sharing_irq = h->sharing_irq = 1;
1042                                 if (hwif->chipset != ide_pci ||
1043                                     h->chipset != ide_pci) {
1044                                         save_match(hwif, h, &match);
1045                                 }
1046                         }
1047                         if (hwif->serialized) {
1048                                 if (hwif->mate && hwif->mate->irq == h->irq)
1049                                         save_match(hwif, h, &match);
1050                         }
1051                         if (h->serialized) {
1052                                 if (h->mate && hwif->irq == h->mate->irq)
1053                                         save_match(hwif, h, &match);
1054                         }
1055                 }
1056         }
1057 #endif /* MAX_HWIFS > 1 */
1058         /*
1059          * If we are still without a hwgroup, then form a new one
1060          */
1061         if (match) {
1062                 hwgroup = match->hwgroup;
1063                 hwif->hwgroup = hwgroup;
1064                 /*
1065                  * Link us into the hwgroup.
1066                  * This must be done early, do ensure that unexpected_intr
1067                  * can find the hwif and prevent irq storms.
1068                  * No drives are attached to the new hwif, choose_drive
1069                  * can't do anything stupid (yet).
1070                  * Add ourself as the 2nd entry to the hwgroup->hwif
1071                  * linked list, the first entry is the hwif that owns
1072                  * hwgroup->handler - do not change that.
1073                  */
1074                 spin_lock_irq(&ide_lock);
1075                 hwif->next = hwgroup->hwif->next;
1076                 hwgroup->hwif->next = hwif;
1077                 BUG_ON(hwif->next == hwif);
1078                 spin_unlock_irq(&ide_lock);
1079         } else {
1080                 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1081                                        hwif_to_node(hwif));
1082                 if (hwgroup == NULL)
1083                         goto out_up;
1084
1085                 hwif->hwgroup = hwgroup;
1086                 hwgroup->hwif = hwif->next = hwif;
1087
1088                 init_timer(&hwgroup->timer);
1089                 hwgroup->timer.function = &ide_timer_expiry;
1090                 hwgroup->timer.data = (unsigned long) hwgroup;
1091         }
1092
1093         ide_ports[hwif->index] = hwif;
1094
1095         /*
1096          * Allocate the irq, if not already obtained for another hwif
1097          */
1098         if (!match || match->irq != hwif->irq) {
1099                 int sa = 0;
1100 #if defined(__mc68000__)
1101                 sa = IRQF_SHARED;
1102 #endif /* __mc68000__ */
1103
1104                 if (hwif->chipset == ide_pci || hwif->chipset == ide_cmd646 ||
1105                     hwif->chipset == ide_ali14xx)
1106                         sa = IRQF_SHARED;
1107
1108                 if (io_ports->ctl_addr)
1109                         hwif->tp_ops->set_irq(hwif, 1);
1110
1111                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1112                         goto out_unlink;
1113         }
1114
1115         if (!hwif->rqsize) {
1116                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1117                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1118                         hwif->rqsize = 256;
1119                 else
1120                         hwif->rqsize = 65536;
1121         }
1122
1123 #if !defined(__mc68000__)
1124         printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1125                 io_ports->data_addr, io_ports->status_addr,
1126                 io_ports->ctl_addr, hwif->irq);
1127 #else
1128         printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
1129                 io_ports->data_addr, hwif->irq);
1130 #endif /* __mc68000__ */
1131         if (match)
1132                 printk(KERN_CONT " (%sed with %s)",
1133                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1134         printk(KERN_CONT "\n");
1135
1136         mutex_unlock(&ide_cfg_mtx);
1137         return 0;
1138 out_unlink:
1139         ide_remove_port_from_hwgroup(hwif);
1140 out_up:
1141         mutex_unlock(&ide_cfg_mtx);
1142         return 1;
1143 }
1144
1145 static int ata_lock(dev_t dev, void *data)
1146 {
1147         /* FIXME: we want to pin hwif down */
1148         return 0;
1149 }
1150
1151 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1152 {
1153         ide_hwif_t *hwif = data;
1154         int unit = *part >> PARTN_BITS;
1155         ide_drive_t *drive = &hwif->drives[unit];
1156         if (!drive->present)
1157                 return NULL;
1158
1159         if (drive->media == ide_disk)
1160                 request_module("ide-disk");
1161         if (drive->scsi)
1162                 request_module("ide-scsi");
1163         if (drive->media == ide_cdrom || drive->media == ide_optical)
1164                 request_module("ide-cd");
1165         if (drive->media == ide_tape)
1166                 request_module("ide-tape");
1167         if (drive->media == ide_floppy)
1168                 request_module("ide-floppy");
1169
1170         return NULL;
1171 }
1172
1173 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1174 {
1175         struct gendisk *p = data;
1176         *part &= (1 << PARTN_BITS) - 1;
1177         return &disk_to_dev(p)->kobj;
1178 }
1179
1180 static int exact_lock(dev_t dev, void *data)
1181 {
1182         struct gendisk *p = data;
1183
1184         if (!get_disk(p))
1185                 return -1;
1186         return 0;
1187 }
1188
1189 void ide_register_region(struct gendisk *disk)
1190 {
1191         blk_register_region(MKDEV(disk->major, disk->first_minor),
1192                             disk->minors, NULL, exact_match, exact_lock, disk);
1193 }
1194
1195 EXPORT_SYMBOL_GPL(ide_register_region);
1196
1197 void ide_unregister_region(struct gendisk *disk)
1198 {
1199         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1200                               disk->minors);
1201 }
1202
1203 EXPORT_SYMBOL_GPL(ide_unregister_region);
1204
1205 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1206 {
1207         ide_hwif_t *hwif = drive->hwif;
1208         unsigned int unit = (drive->select.all >> 4) & 1;
1209
1210         disk->major = hwif->major;
1211         disk->first_minor = unit << PARTN_BITS;
1212         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1213         disk->queue = drive->queue;
1214 }
1215
1216 EXPORT_SYMBOL_GPL(ide_init_disk);
1217
1218 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1219 {
1220         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1221
1222         if (drive == drive->next) {
1223                 /* special case: last drive from hwgroup. */
1224                 BUG_ON(hwgroup->drive != drive);
1225                 hwgroup->drive = NULL;
1226         } else {
1227                 ide_drive_t *walk;
1228
1229                 walk = hwgroup->drive;
1230                 while (walk->next != drive)
1231                         walk = walk->next;
1232                 walk->next = drive->next;
1233                 if (hwgroup->drive == drive) {
1234                         hwgroup->drive = drive->next;
1235                         hwgroup->hwif = hwgroup->drive->hwif;
1236                 }
1237         }
1238         BUG_ON(hwgroup->drive == drive);
1239 }
1240
1241 static void drive_release_dev (struct device *dev)
1242 {
1243         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1244
1245         ide_proc_unregister_device(drive);
1246
1247         spin_lock_irq(&ide_lock);
1248         ide_remove_drive_from_hwgroup(drive);
1249         kfree(drive->id);
1250         drive->id = NULL;
1251         drive->present = 0;
1252         /* Messed up locking ... */
1253         spin_unlock_irq(&ide_lock);
1254         blk_cleanup_queue(drive->queue);
1255         spin_lock_irq(&ide_lock);
1256         drive->queue = NULL;
1257         spin_unlock_irq(&ide_lock);
1258
1259         complete(&drive->gendev_rel_comp);
1260 }
1261
1262 static int hwif_init(ide_hwif_t *hwif)
1263 {
1264         int old_irq;
1265
1266         if (!hwif->irq) {
1267                 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1268                 if (!hwif->irq) {
1269                         printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
1270                         return 0;
1271                 }
1272         }
1273
1274         if (register_blkdev(hwif->major, hwif->name))
1275                 return 0;
1276
1277         if (!hwif->sg_max_nents)
1278                 hwif->sg_max_nents = PRD_ENTRIES;
1279
1280         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1281                                  GFP_KERNEL);
1282         if (!hwif->sg_table) {
1283                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1284                 goto out;
1285         }
1286
1287         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1288
1289         if (init_irq(hwif) == 0)
1290                 goto done;
1291
1292         old_irq = hwif->irq;
1293         /*
1294          *      It failed to initialise. Find the default IRQ for
1295          *      this port and try that.
1296          */
1297         hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1298         if (!hwif->irq) {
1299                 printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
1300                         hwif->name, old_irq);
1301                 goto out;
1302         }
1303         if (init_irq(hwif)) {
1304                 printk(KERN_ERR "%s: probed IRQ %d and default IRQ %d failed\n",
1305                         hwif->name, old_irq, hwif->irq);
1306                 goto out;
1307         }
1308         printk(KERN_WARNING "%s: probed IRQ %d failed, using default\n",
1309                 hwif->name, hwif->irq);
1310
1311 done:
1312         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1313                             THIS_MODULE, ata_probe, ata_lock, hwif);
1314         return 1;
1315
1316 out:
1317         unregister_blkdev(hwif->major, hwif->name);
1318         return 0;
1319 }
1320
1321 static void hwif_register_devices(ide_hwif_t *hwif)
1322 {
1323         unsigned int i;
1324
1325         for (i = 0; i < MAX_DRIVES; i++) {
1326                 ide_drive_t *drive = &hwif->drives[i];
1327                 struct device *dev = &drive->gendev;
1328                 int ret;
1329
1330                 if (!drive->present)
1331                         continue;
1332
1333                 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1334                 dev->parent = &hwif->gendev;
1335                 dev->bus = &ide_bus_type;
1336                 dev->driver_data = drive;
1337                 dev->release = drive_release_dev;
1338
1339                 ret = device_register(dev);
1340                 if (ret < 0)
1341                         printk(KERN_WARNING "IDE: %s: device_register error: "
1342                                             "%d\n", __func__, ret);
1343         }
1344 }
1345
1346 static void ide_port_init_devices(ide_hwif_t *hwif)
1347 {
1348         const struct ide_port_ops *port_ops = hwif->port_ops;
1349         int i;
1350
1351         for (i = 0; i < MAX_DRIVES; i++) {
1352                 ide_drive_t *drive = &hwif->drives[i];
1353
1354                 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1355                         drive->io_32bit = 1;
1356                 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1357                         drive->unmask = 1;
1358                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1359                         drive->no_unmask = 1;
1360
1361                 if (port_ops && port_ops->init_dev)
1362                         port_ops->init_dev(drive);
1363         }
1364 }
1365
1366 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1367                           const struct ide_port_info *d)
1368 {
1369         hwif->channel = port;
1370
1371         if (d->chipset)
1372                 hwif->chipset = d->chipset;
1373
1374         if (d->init_iops)
1375                 d->init_iops(hwif);
1376
1377         if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1378             (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1379                 hwif->irq = port ? 15 : 14;
1380
1381         /* ->host_flags may be set by ->init_iops (or even earlier...) */
1382         hwif->host_flags |= d->host_flags;
1383         hwif->pio_mask = d->pio_mask;
1384
1385         if (d->tp_ops)
1386                 hwif->tp_ops = d->tp_ops;
1387
1388         /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1389         if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1390                 hwif->port_ops = d->port_ops;
1391
1392         hwif->swdma_mask = d->swdma_mask;
1393         hwif->mwdma_mask = d->mwdma_mask;
1394         hwif->ultra_mask = d->udma_mask;
1395
1396         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1397                 int rc;
1398
1399                 if (d->init_dma)
1400                         rc = d->init_dma(hwif, d);
1401                 else
1402                         rc = ide_hwif_setup_dma(hwif, d);
1403
1404                 if (rc < 0) {
1405                         printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1406                         hwif->dma_base = 0;
1407                         hwif->swdma_mask = 0;
1408                         hwif->mwdma_mask = 0;
1409                         hwif->ultra_mask = 0;
1410                 } else if (d->dma_ops)
1411                         hwif->dma_ops = d->dma_ops;
1412         }
1413
1414         if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1415             ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1416                 if (hwif->mate)
1417                         hwif->mate->serialized = hwif->serialized = 1;
1418         }
1419
1420         if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1421                 hwif->rqsize = 256;
1422
1423         /* call chipset specific routine for each enabled port */
1424         if (d->init_hwif)
1425                 d->init_hwif(hwif);
1426 }
1427
1428 static void ide_port_cable_detect(ide_hwif_t *hwif)
1429 {
1430         const struct ide_port_ops *port_ops = hwif->port_ops;
1431
1432         if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1433                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1434                         hwif->cbl = port_ops->cable_detect(hwif);
1435         }
1436 }
1437
1438 static ssize_t store_delete_devices(struct device *portdev,
1439                                     struct device_attribute *attr,
1440                                     const char *buf, size_t n)
1441 {
1442         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1443
1444         if (strncmp(buf, "1", n))
1445                 return -EINVAL;
1446
1447         ide_port_unregister_devices(hwif);
1448
1449         return n;
1450 };
1451
1452 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1453
1454 static ssize_t store_scan(struct device *portdev,
1455                           struct device_attribute *attr,
1456                           const char *buf, size_t n)
1457 {
1458         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1459
1460         if (strncmp(buf, "1", n))
1461                 return -EINVAL;
1462
1463         ide_port_unregister_devices(hwif);
1464         ide_port_scan(hwif);
1465
1466         return n;
1467 };
1468
1469 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1470
1471 static struct device_attribute *ide_port_attrs[] = {
1472         &dev_attr_delete_devices,
1473         &dev_attr_scan,
1474         NULL
1475 };
1476
1477 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1478 {
1479         int i, uninitialized_var(rc);
1480
1481         for (i = 0; ide_port_attrs[i]; i++) {
1482                 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1483                 if (rc)
1484                         break;
1485         }
1486
1487         return rc;
1488 }
1489
1490 static unsigned int ide_indexes;
1491
1492 /**
1493  *      ide_find_port_slot      -       find free port slot
1494  *      @d: IDE port info
1495  *
1496  *      Return the new port slot index or -ENOENT if we are out of free slots.
1497  */
1498
1499 static int ide_find_port_slot(const struct ide_port_info *d)
1500 {
1501         int idx = -ENOENT;
1502         u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1503         u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
1504
1505         /*
1506          * Claim an unassigned slot.
1507          *
1508          * Give preference to claiming other slots before claiming ide0/ide1,
1509          * just in case there's another interface yet-to-be-scanned
1510          * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1511          *
1512          * Unless there is a bootable card that does not use the standard
1513          * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1514          */
1515         mutex_lock(&ide_cfg_mtx);
1516         if (MAX_HWIFS == 1) {
1517                 if (ide_indexes == 0 && i == 0)
1518                         idx = 1;
1519         } else {
1520                 if (bootable) {
1521                         if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1522                                 idx = ffz(ide_indexes | i);
1523                 } else {
1524                         if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1525                                 idx = ffz(ide_indexes | 3);
1526                         else if ((ide_indexes & 3) != 3)
1527                                 idx = ffz(ide_indexes);
1528                 }
1529         }
1530         if (idx >= 0)
1531                 ide_indexes |= (1 << idx);
1532         mutex_unlock(&ide_cfg_mtx);
1533
1534         return idx;
1535 }
1536
1537 static void ide_free_port_slot(int idx)
1538 {
1539         mutex_lock(&ide_cfg_mtx);
1540         ide_indexes &= ~(1 << idx);
1541         mutex_unlock(&ide_cfg_mtx);
1542 }
1543
1544 struct ide_host *ide_host_alloc_all(const struct ide_port_info *d,
1545                                     hw_regs_t **hws)
1546 {
1547         struct ide_host *host;
1548         int i;
1549
1550         host = kzalloc(sizeof(*host), GFP_KERNEL);
1551         if (host == NULL)
1552                 return NULL;
1553
1554         for (i = 0; i < MAX_HWIFS; i++) {
1555                 ide_hwif_t *hwif;
1556                 int idx;
1557
1558                 if (hws[i] == NULL)
1559                         continue;
1560
1561                 hwif = kzalloc(sizeof(*hwif), GFP_KERNEL);
1562                 if (hwif == NULL)
1563                         continue;
1564
1565                 idx = ide_find_port_slot(d);
1566                 if (idx < 0) {
1567                         printk(KERN_ERR "%s: no free slot for interface\n",
1568                                         d ? d->name : "ide");
1569                         kfree(hwif);
1570                         continue;
1571                 }
1572
1573                 ide_init_port_data(hwif, idx);
1574
1575                 hwif->host = host;
1576
1577                 host->ports[i] = hwif;
1578                 host->n_ports++;
1579         }
1580
1581         if (host->n_ports == 0) {
1582                 kfree(host);
1583                 return NULL;
1584         }
1585
1586         if (hws[0])
1587                 host->dev[0] = hws[0]->dev;
1588
1589         if (d) {
1590                 host->init_chipset = d->init_chipset;
1591                 host->host_flags = d->host_flags;
1592         }
1593
1594         return host;
1595 }
1596 EXPORT_SYMBOL_GPL(ide_host_alloc_all);
1597
1598 struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
1599 {
1600         hw_regs_t *hws_all[MAX_HWIFS];
1601         int i;
1602
1603         for (i = 0; i < MAX_HWIFS; i++)
1604                 hws_all[i] = (i < 4) ? hws[i] : NULL;
1605
1606         return ide_host_alloc_all(d, hws_all);
1607 }
1608 EXPORT_SYMBOL_GPL(ide_host_alloc);
1609
1610 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1611                       hw_regs_t **hws)
1612 {
1613         ide_hwif_t *hwif, *mate = NULL;
1614         int i, j = 0;
1615
1616         for (i = 0; i < MAX_HWIFS; i++) {
1617                 hwif = host->ports[i];
1618
1619                 if (hwif == NULL) {
1620                         mate = NULL;
1621                         continue;
1622                 }
1623
1624                 ide_init_port_hw(hwif, hws[i]);
1625                 ide_port_apply_params(hwif);
1626
1627                 if (d == NULL) {
1628                         mate = NULL;
1629                         continue;
1630                 }
1631
1632                 if ((i & 1) && mate) {
1633                         hwif->mate = mate;
1634                         mate->mate = hwif;
1635                 }
1636
1637                 mate = (i & 1) ? NULL : hwif;
1638
1639                 ide_init_port(hwif, i & 1, d);
1640                 ide_port_cable_detect(hwif);
1641                 ide_port_init_devices(hwif);
1642         }
1643
1644         for (i = 0; i < MAX_HWIFS; i++) {
1645                 hwif = host->ports[i];
1646
1647                 if (hwif == NULL)
1648                         continue;
1649
1650                 if (ide_probe_port(hwif) == 0)
1651                         hwif->present = 1;
1652
1653                 if (hwif->chipset != ide_4drives || !hwif->mate ||
1654                     !hwif->mate->present)
1655                         ide_register_port(hwif);
1656
1657                 if (hwif->present)
1658                         ide_port_tune_devices(hwif);
1659         }
1660
1661         for (i = 0; i < MAX_HWIFS; i++) {
1662                 hwif = host->ports[i];
1663
1664                 if (hwif == NULL)
1665                         continue;
1666
1667                 if (hwif_init(hwif) == 0) {
1668                         printk(KERN_INFO "%s: failed to initialize IDE "
1669                                          "interface\n", hwif->name);
1670                         hwif->present = 0;
1671                         continue;
1672                 }
1673
1674                 j++;
1675
1676                 if (hwif->present)
1677                         ide_port_setup_devices(hwif);
1678
1679                 ide_acpi_init(hwif);
1680
1681                 if (hwif->present)
1682                         ide_acpi_port_init_devices(hwif);
1683         }
1684
1685         for (i = 0; i < MAX_HWIFS; i++) {
1686                 hwif = host->ports[i];
1687
1688                 if (hwif == NULL)
1689                         continue;
1690
1691                 if (hwif->chipset == ide_unknown)
1692                         hwif->chipset = ide_generic;
1693
1694                 if (hwif->present)
1695                         hwif_register_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                 ide_sysfs_register_port(hwif);
1705                 ide_proc_register_port(hwif);
1706
1707                 if (hwif->present)
1708                         ide_proc_port_register_devices(hwif);
1709         }
1710
1711         return j ? 0 : -1;
1712 }
1713 EXPORT_SYMBOL_GPL(ide_host_register);
1714
1715 int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
1716                  struct ide_host **hostp)
1717 {
1718         struct ide_host *host;
1719         int rc;
1720
1721         host = ide_host_alloc(d, hws);
1722         if (host == NULL)
1723                 return -ENOMEM;
1724
1725         rc = ide_host_register(host, d, hws);
1726         if (rc) {
1727                 ide_host_free(host);
1728                 return rc;
1729         }
1730
1731         if (hostp)
1732                 *hostp = host;
1733
1734         return 0;
1735 }
1736 EXPORT_SYMBOL_GPL(ide_host_add);
1737
1738 void ide_host_free(struct ide_host *host)
1739 {
1740         ide_hwif_t *hwif;
1741         int i;
1742
1743         for (i = 0; i < MAX_HWIFS; i++) {
1744                 hwif = host->ports[i];
1745
1746                 if (hwif == NULL)
1747                         continue;
1748
1749                 ide_free_port_slot(hwif->index);
1750                 kfree(hwif);
1751         }
1752
1753         kfree(host);
1754 }
1755 EXPORT_SYMBOL_GPL(ide_host_free);
1756
1757 void ide_host_remove(struct ide_host *host)
1758 {
1759         int i;
1760
1761         for (i = 0; i < MAX_HWIFS; i++) {
1762                 if (host->ports[i])
1763                         ide_unregister(host->ports[i]);
1764         }
1765
1766         ide_host_free(host);
1767 }
1768 EXPORT_SYMBOL_GPL(ide_host_remove);
1769
1770 void ide_port_scan(ide_hwif_t *hwif)
1771 {
1772         ide_port_apply_params(hwif);
1773         ide_port_cable_detect(hwif);
1774         ide_port_init_devices(hwif);
1775
1776         if (ide_probe_port(hwif) < 0)
1777                 return;
1778
1779         hwif->present = 1;
1780
1781         ide_port_tune_devices(hwif);
1782         ide_acpi_port_init_devices(hwif);
1783         ide_port_setup_devices(hwif);
1784         hwif_register_devices(hwif);
1785         ide_proc_port_register_devices(hwif);
1786 }
1787 EXPORT_SYMBOL_GPL(ide_port_scan);
1788
1789 static void ide_legacy_init_one(hw_regs_t **hws, hw_regs_t *hw,
1790                                 u8 port_no, const struct ide_port_info *d,
1791                                 unsigned long config)
1792 {
1793         unsigned long base, ctl;
1794         int irq;
1795
1796         if (port_no == 0) {
1797                 base = 0x1f0;
1798                 ctl  = 0x3f6;
1799                 irq  = 14;
1800         } else {
1801                 base = 0x170;
1802                 ctl  = 0x376;
1803                 irq  = 15;
1804         }
1805
1806         if (!request_region(base, 8, d->name)) {
1807                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1808                                 d->name, base, base + 7);
1809                 return;
1810         }
1811
1812         if (!request_region(ctl, 1, d->name)) {
1813                 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1814                                 d->name, ctl);
1815                 release_region(base, 8);
1816                 return;
1817         }
1818
1819         ide_std_init_ports(hw, base, ctl);
1820         hw->irq = irq;
1821         hw->chipset = d->chipset;
1822         hw->config = config;
1823
1824         hws[port_no] = hw;
1825 }
1826
1827 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
1828 {
1829         hw_regs_t hw[2], *hws[] = { NULL, NULL, NULL, NULL };
1830
1831         memset(&hw, 0, sizeof(hw));
1832
1833         if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
1834                 ide_legacy_init_one(hws, &hw[0], 0, d, config);
1835         ide_legacy_init_one(hws, &hw[1], 1, d, config);
1836
1837         if (hws[0] == NULL && hws[1] == NULL &&
1838             (d->host_flags & IDE_HFLAG_SINGLE))
1839                 return -ENOENT;
1840
1841         return ide_host_add(d, hws, NULL);
1842 }
1843 EXPORT_SYMBOL_GPL(ide_legacy_device_add);