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->dev_flags |= IDE_DFLAG_ID_READ;
 125
 126         local_irq_enable();
 127 #ifdef DEBUG
 128         printk(KERN_INFO "%s: dumping identify data\n", drive->name);
 129         ide_dump_identify((u8 *)id);
 130 #endif
 131         ide_fix_driveid(id);
 132
 133         /*
 134          *  ATA_CMD_ID_ATA returns little-endian info,
 135          *  ATA_CMD_ID_ATAPI *usually* returns little-endian info.
 136          */
 137         if (cmd == ATA_CMD_ID_ATAPI) {
 138                 if ((m[0] == 'N' && m[1] == 'E') ||  /* NEC */
 139                     (m[0] == 'F' && m[1] == 'X') ||  /* Mitsumi */
 140                     (m[0] == 'P' && m[1] == 'i'))    /* Pioneer */
 141                         /* Vertos drives may still be weird */
 142                         bswap ^= 1;
 143         }
 144
 145         ide_fixstring(m, ATA_ID_PROD_LEN, bswap);
 146         ide_fixstring((char *)&id[ATA_ID_FW_REV], ATA_ID_FW_REV_LEN, bswap);
 147         ide_fixstring((char *)&id[ATA_ID_SERNO], ATA_ID_SERNO_LEN, bswap);
 148
 149         /* we depend on this a lot! */
 150         m[ATA_ID_PROD_LEN - 1] = '\0';
 151
 152         if (strstr(m, "E X A B Y T E N E S T"))
 153                 goto err_misc;
 154
 155         printk(KERN_INFO "%s: %s, ", drive->name, m);
 156
 157         drive->dev_flags |= IDE_DFLAG_PRESENT;
 158         drive->dev_flags &= ~IDE_DFLAG_DEAD;
 159
 160         /*
 161          * Check for an ATAPI device
 162          */
 163         if (cmd == ATA_CMD_ID_ATAPI) {
 164                 u8 type = (id[ATA_ID_CONFIG] >> 8) & 0x1f;
 165
 166                 printk(KERN_CONT "ATAPI ");
 167                 switch (type) {
 168                         case ide_floppy:
 169                                 if (!strstr(m, "CD-ROM")) {
 170                                         if (!strstr(m, "oppy") &&
 171                                             !strstr(m, "poyp") &&
 172                                             !strstr(m, "ZIP"))
 173                                                 printk(KERN_CONT "cdrom or floppy?, assuming ");
 174                                         if (drive->media != ide_cdrom) {
 175                                                 printk(KERN_CONT "FLOPPY");
 176                                                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 177                                                 break;
 178                                         }
 179                                 }
 180                                 /* Early cdrom models used zero */
 181                                 type = ide_cdrom;
 182                         case ide_cdrom:
 183                                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 184 #ifdef CONFIG_PPC
 185                                 /* kludge for Apple PowerBook internal zip */
 186                                 if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) {
 187                                         printk(KERN_CONT "FLOPPY");
 188                                         type = ide_floppy;
 189                                         break;
 190                                 }
 191 #endif
 192                                 printk(KERN_CONT "CD/DVD-ROM");
 193                                 break;
 194                         case ide_tape:
 195                                 printk(KERN_CONT "TAPE");
 196                                 break;
 197                         case ide_optical:
 198                                 printk(KERN_CONT "OPTICAL");
 199                                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 200                                 break;
 201                         default:
 202                                 printk(KERN_CONT "UNKNOWN (type %d)", type);
 203                                 break;
 204                 }
 205                 printk(KERN_CONT " drive\n");
 206                 drive->media = type;
 207                 /* an ATAPI device ignores DRDY */
 208                 drive->ready_stat = 0;
 209                 if (ata_id_cdb_intr(id))
 210                         drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;
 211                 return;
 212         }
 213
 214         /*
 215          * Not an ATAPI device: looks like a "regular" hard disk
 216          */
 217
 218         is_cfa = ata_id_is_cfa(id);
 219
 220         /* CF devices are *not* removable in Linux definition of the term */
 221         if (is_cfa == 0 && (id[ATA_ID_CONFIG] & (1 << 7)))
 222                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 223
 224         drive->media = ide_disk;
 225
 226         printk(KERN_CONT "%s DISK drive\n", is_cfa ? "CFA" : "ATA");
 227
 228         return;
 229
 230 err_misc:
 231         kfree(id);
 232         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 233         return;
 234 }
 235
 236 /**
 237  *      actual_try_to_identify  -       send ata/atapi identify
 238  *      @drive: drive to identify
 239  *      @cmd: command to use
 240  *
 241  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 242  *      and waits for a response.  It also monitors irqs while this is
 243  *      happening, in hope of automatically determining which one is
 244  *      being used by the interface.
 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 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 252 {
 253         ide_hwif_t *hwif = HWIF(drive);
 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         /* take a deep breath */
 261         msleep(50);
 262
 263         if (io_ports->ctl_addr) {
 264                 a = tp_ops->read_altstatus(hwif);
 265                 s = tp_ops->read_status(hwif);
 266                 if ((a ^ s) & ~ATA_IDX)
 267                         /* ancient Seagate drives, broken interfaces */
 268                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
 269                                          "instead of ALTSTATUS(0x%02x)\n",
 270                                          drive->name, s, a);
 271                 else
 272                         /* use non-intrusive polling */
 273                         use_altstatus = 1;
 274         }
 275
 276         /* set features register for atapi
 277          * identify command to be sure of reply
 278          */
 279         if (cmd == ATA_CMD_ID_ATAPI) {
 280                 ide_task_t task;
 281
 282                 memset(&task, 0, sizeof(task));
 283                 /* disable DMA & overlap */
 284                 task.tf_flags = IDE_TFLAG_OUT_FEATURE;
 285
 286                 tp_ops->tf_load(drive, &task);
 287         }
 288
 289         /* ask drive for ID */
 290         tp_ops->exec_command(hwif, cmd);
 291
 292         timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 293
 294         if (ide_busy_sleep(hwif, timeout, use_altstatus))
 295                 return 1;
 296
 297         /* wait for IRQ and ATA_DRQ */
 298         msleep(50);
 299         s = tp_ops->read_status(hwif);
 300
 301         if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
 302                 unsigned long flags;
 303
 304                 /* local CPU only; some systems need this */
 305                 local_irq_save(flags);
 306                 /* drive returned ID */
 307                 do_identify(drive, cmd);
 308                 /* drive responded with ID */
 309                 rc = 0;
 310                 /* clear drive IRQ */
 311                 (void)tp_ops->read_status(hwif);
 312                 local_irq_restore(flags);
 313         } else {
 314                 /* drive refused ID */
 315                 rc = 2;
 316         }
 317         return rc;
 318 }
 319
 320 /**
 321  *      try_to_identify -       try to identify a drive
 322  *      @drive: drive to probe
 323  *      @cmd: command to use
 324  *
 325  *      Issue the identify command and then do IRQ probing to
 326  *      complete the identification when needed by finding the
 327  *      IRQ the drive is attached to
 328  */
 329
 330 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 331 {
 332         ide_hwif_t *hwif = HWIF(drive);
 333         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 334         int retval;
 335         int autoprobe = 0;
 336         unsigned long cookie = 0;
 337
 338         /*
 339          * Disable device irq unless we need to
 340          * probe for it. Otherwise we'll get spurious
 341          * interrupts during the identify-phase that
 342          * the irq handler isn't expecting.
 343          */
 344         if (hwif->io_ports.ctl_addr) {
 345                 if (!hwif->irq) {
 346                         autoprobe = 1;
 347                         cookie = probe_irq_on();
 348                 }
 349                 tp_ops->set_irq(hwif, autoprobe);
 350         }
 351
 352         retval = actual_try_to_identify(drive, cmd);
 353
 354         if (autoprobe) {
 355                 int irq;
 356
 357                 tp_ops->set_irq(hwif, 0);
 358                 /* clear drive IRQ */
 359                 (void)tp_ops->read_status(hwif);
 360                 udelay(5);
 361                 irq = probe_irq_off(cookie);
 362                 if (!hwif->irq) {
 363                         if (irq > 0) {
 364                                 hwif->irq = irq;
 365                         } else {
 366                                 /* Mmmm.. multiple IRQs..
 367                                  * don't know which was ours
 368                                  */
 369                                 printk(KERN_ERR "%s: IRQ probe failed (0x%lx)\n",
 370                                         drive->name, cookie);
 371                         }
 372                 }
 373         }
 374         return retval;
 375 }
 376
 377 int ide_busy_sleep(ide_hwif_t *hwif, unsigned long timeout, int altstatus)
 378 {
 379         u8 stat;
 380
 381         timeout += jiffies;
 382
 383         do {
 384                 msleep(50);     /* give drive a breather */
 385                 stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
 386                                  : hwif->tp_ops->read_status(hwif);
 387                 if ((stat & ATA_BUSY) == 0)
 388                         return 0;
 389         } while (time_before(jiffies, timeout));
 390
 391         return 1;       /* drive timed-out */
 392 }
 393
 394 static u8 ide_read_device(ide_drive_t *drive)
 395 {
 396         ide_task_t task;
 397
 398         memset(&task, 0, sizeof(task));
 399         task.tf_flags = IDE_TFLAG_IN_DEVICE;
 400
 401         drive->hwif->tp_ops->tf_read(drive, &task);
 402
 403         return task.tf.device;
 404 }
 405
 406 /**
 407  *      do_probe                -       probe an IDE device
 408  *      @drive: drive to probe
 409  *      @cmd: command to use
 410  *
 411  *      do_probe() has the difficult job of finding a drive if it exists,
 412  *      without getting hung up if it doesn't exist, without trampling on
 413  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 414  *
 415  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 416  *      but does not respond right away, the probe will "hang in there"
 417  *      for the maximum wait time (about 30 seconds), otherwise it will
 418  *      exit much more quickly.
 419  *
 420  * Returns:     0  device was identified
 421  *              1  device timed-out (no response to identify request)
 422  *              2  device aborted the command (refused to identify itself)
 423  *              3  bad status from device (possible for ATAPI drives)
 424  *              4  probe was not attempted because failure was obvious
 425  */
 426
 427 static int do_probe (ide_drive_t *drive, u8 cmd)
 428 {
 429         ide_hwif_t *hwif = HWIF(drive);
 430         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 431         int rc;
 432         u8 present = !!(drive->dev_flags & IDE_DFLAG_PRESENT), stat;
 433
 434         /* avoid waiting for inappropriate probes */
 435         if (present && drive->media != ide_disk && cmd == ATA_CMD_ID_ATA)
 436                 return 4;
 437
 438 #ifdef DEBUG
 439         printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
 440                 drive->name, present, drive->media,
 441                 (cmd == ATA_CMD_ID_ATA) ? "ATA" : "ATAPI");
 442 #endif
 443
 444         /* needed for some systems
 445          * (e.g. crw9624 as drive0 with disk as slave)
 446          */
 447         msleep(50);
 448         SELECT_DRIVE(drive);
 449         msleep(50);
 450
 451         if (ide_read_device(drive) != drive->select && present == 0) {
 452                 if (drive->dn & 1) {
 453                         /* exit with drive0 selected */
 454                         SELECT_DRIVE(&hwif->drives[0]);
 455                         /* allow ATA_BUSY to assert & clear */
 456                         msleep(50);
 457                 }
 458                 /* no i/f present: mmm.. this should be a 4 -ml */
 459                 return 3;
 460         }
 461
 462         stat = tp_ops->read_status(hwif);
 463
 464         if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) ||
 465             present || cmd == ATA_CMD_ID_ATAPI) {
 466                 /* send cmd and wait */
 467                 if ((rc = try_to_identify(drive, cmd))) {
 468                         /* failed: try again */
 469                         rc = try_to_identify(drive,cmd);
 470                 }
 471
 472                 stat = tp_ops->read_status(hwif);
 473
 474                 if (stat == (ATA_BUSY | ATA_DRDY))
 475                         return 4;
 476
 477                 if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) {
 478                         printk(KERN_ERR "%s: no response (status = 0x%02x), "
 479                                         "resetting drive\n", drive->name, stat);
 480                         msleep(50);
 481                         SELECT_DRIVE(drive);
 482                         msleep(50);
 483                         tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
 484                         (void)ide_busy_sleep(hwif, WAIT_WORSTCASE, 0);
 485                         rc = try_to_identify(drive, cmd);
 486                 }
 487
 488                 /* ensure drive IRQ is clear */
 489                 stat = tp_ops->read_status(hwif);
 490
 491                 if (rc == 1)
 492                         printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
 493                                         drive->name, stat);
 494         } else {
 495                 /* not present or maybe ATAPI */
 496                 rc = 3;
 497         }
 498         if (drive->dn & 1) {
 499                 /* exit with drive0 selected */
 500                 SELECT_DRIVE(&hwif->drives[0]);
 501                 msleep(50);
 502                 /* ensure drive irq is clear */
 503                 (void)tp_ops->read_status(hwif);
 504         }
 505         return rc;
 506 }
 507
 508 /*
 509  *
 510  */
 511 static void enable_nest (ide_drive_t *drive)
 512 {
 513         ide_hwif_t *hwif = HWIF(drive);
 514         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 515         u8 stat;
 516
 517         printk(KERN_INFO "%s: enabling %s -- ",
 518                 hwif->name, (char *)&drive->id[ATA_ID_PROD]);
 519
 520         SELECT_DRIVE(drive);
 521         msleep(50);
 522         tp_ops->exec_command(hwif, ATA_EXABYTE_ENABLE_NEST);
 523
 524         if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 0)) {
 525                 printk(KERN_CONT "failed (timeout)\n");
 526                 return;
 527         }
 528
 529         msleep(50);
 530
 531         stat = tp_ops->read_status(hwif);
 532
 533         if (!OK_STAT(stat, 0, BAD_STAT))
 534                 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
 535         else
 536                 printk(KERN_CONT "success\n");
 537 }
 538
 539 /**
 540  *      probe_for_drives        -       upper level drive probe
 541  *      @drive: drive to probe for
 542  *
 543  *      probe_for_drive() tests for existence of a given drive using do_probe()
 544  *      and presents things to the user as needed.
 545  *
 546  *      Returns:        0  no device was found
 547  *                      1  device was found
 548  *                         (note: IDE_DFLAG_PRESENT might still be not set)
 549  */
 550
 551 static inline u8 probe_for_drive (ide_drive_t *drive)
 552 {
 553         char *m;
 554
 555         /*
 556          *      In order to keep things simple we have an id
 557          *      block for all drives at all times. If the device
 558          *      is pre ATA or refuses ATA/ATAPI identify we
 559          *      will add faked data to this.
 560          *
 561          *      Also note that 0 everywhere means "can't do X"
 562          */
 563
 564         drive->dev_flags &= ~IDE_DFLAG_ID_READ;
 565
 566         drive->id = kzalloc(SECTOR_SIZE, GFP_KERNEL);
 567         if (drive->id == NULL) {
 568                 printk(KERN_ERR "ide: out of memory for id data.\n");
 569                 return 0;
 570         }
 571
 572         m = (char *)&drive->id[ATA_ID_PROD];
 573         strcpy(m, "UNKNOWN");
 574
 575         /* skip probing? */
 576         if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0) {
 577 retry:
 578                 /* if !(success||timed-out) */
 579                 if (do_probe(drive, ATA_CMD_ID_ATA) >= 2)
 580                         /* look for ATAPI device */
 581                         (void)do_probe(drive, ATA_CMD_ID_ATAPI);
 582
 583                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 584                         /* drive not found */
 585                         return 0;
 586
 587                 if (strstr(m, "E X A B Y T E N E S T")) {
 588                         enable_nest(drive);
 589                         goto retry;
 590                 }
 591
 592                 /* identification failed? */
 593                 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
 594                         if (drive->media == ide_disk) {
 595                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 596                                         drive->name, drive->cyl,
 597                                         drive->head, drive->sect);
 598                         } else if (drive->media == ide_cdrom) {
 599                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 600                         } else {
 601                                 /* nuke it */
 602                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 603                                 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 604                         }
 605                 }
 606                 /* drive was found */
 607         }
 608
 609         if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 610                 return 0;
 611
 612         /* The drive wasn't being helpful. Add generic info only */
 613         if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
 614                 generic_id(drive);
 615                 return 1;
 616         }
 617
 618         if (drive->media == ide_disk) {
 619                 ide_disk_init_chs(drive);
 620                 ide_disk_init_mult_count(drive);
 621         }
 622
 623         return !!(drive->dev_flags & IDE_DFLAG_PRESENT);
 624 }
 625
 626 static void hwif_release_dev(struct device *dev)
 627 {
 628         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 629
 630         complete(&hwif->gendev_rel_comp);
 631 }
 632
 633 static int ide_register_port(ide_hwif_t *hwif)
 634 {
 635         int ret;
 636
 637         /* register with global device tree */
 638         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 639         hwif->gendev.driver_data = hwif;
 640         if (hwif->gendev.parent == NULL) {
 641                 if (hwif->dev)
 642                         hwif->gendev.parent = hwif->dev;
 643                 else
 644                         /* Would like to do = &device_legacy */
 645                         hwif->gendev.parent = NULL;
 646         }
 647         hwif->gendev.release = hwif_release_dev;
 648         ret = device_register(&hwif->gendev);
 649         if (ret < 0) {
 650                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
 651                         __func__, ret);
 652                 goto out;
 653         }
 654
 655         hwif->portdev = device_create_drvdata(ide_port_class, &hwif->gendev,
 656                                               MKDEV(0, 0), hwif, hwif->name);
 657         if (IS_ERR(hwif->portdev)) {
 658                 ret = PTR_ERR(hwif->portdev);
 659                 device_unregister(&hwif->gendev);
 660         }
 661 out:
 662         return ret;
 663 }
 664
 665 /**
 666  *      ide_port_wait_ready     -       wait for port to become ready
 667  *      @hwif: IDE port
 668  *
 669  *      This is needed on some PPCs and a bunch of BIOS-less embedded
 670  *      platforms.  Typical cases are:
 671  *
 672  *      - The firmware hard reset the disk before booting the kernel,
 673  *        the drive is still doing it's poweron-reset sequence, that
 674  *        can take up to 30 seconds.
 675  *
 676  *      - The firmware does nothing (or no firmware), the device is
 677  *        still in POST state (same as above actually).
 678  *
 679  *      - Some CD/DVD/Writer combo drives tend to drive the bus during
 680  *        their reset sequence even when they are non-selected slave
 681  *        devices, thus preventing discovery of the main HD.
 682  *
 683  *      Doing this wait-for-non-busy should not harm any existing
 684  *      configuration and fix some issues like the above.
 685  *
 686  *      BenH.
 687  *
 688  *      Returns 0 on success, error code (< 0) otherwise.
 689  */
 690
 691 static int ide_port_wait_ready(ide_hwif_t *hwif)
 692 {
 693         int unit, rc;
 694
 695         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 696
 697         /* Let HW settle down a bit from whatever init state we
 698          * come from */
 699         mdelay(2);
 700
 701         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 702          * I know of at least one disk who takes 31 seconds, I use 35
 703          * here to be safe
 704          */
 705         rc = ide_wait_not_busy(hwif, 35000);
 706         if (rc)
 707                 return rc;
 708
 709         /* Now make sure both master & slave are ready */
 710         for (unit = 0; unit < MAX_DRIVES; unit++) {
 711                 ide_drive_t *drive = &hwif->drives[unit];
 712
 713                 /* Ignore disks that we will not probe for later. */
 714                 if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0 ||
 715                     (drive->dev_flags & IDE_DFLAG_PRESENT)) {
 716                         SELECT_DRIVE(drive);
 717                         hwif->tp_ops->set_irq(hwif, 1);
 718                         mdelay(2);
 719                         rc = ide_wait_not_busy(hwif, 35000);
 720                         if (rc)
 721                                 goto out;
 722                 } else
 723                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
 724                                           drive->name);
 725         }
 726 out:
 727         /* Exit function with master reselected (let's be sane) */
 728         if (unit)
 729                 SELECT_DRIVE(&hwif->drives[0]);
 730
 731         return rc;
 732 }
 733
 734 /**
 735  *      ide_undecoded_slave     -       look for bad CF adapters
 736  *      @dev1: slave device
 737  *
 738  *      Analyse the drives on the interface and attempt to decide if we
 739  *      have the same drive viewed twice. This occurs with crap CF adapters
 740  *      and PCMCIA sometimes.
 741  */
 742
 743 void ide_undecoded_slave(ide_drive_t *dev1)
 744 {
 745         ide_drive_t *dev0 = &dev1->hwif->drives[0];
 746
 747         if ((dev1->dn & 1) == 0 || (dev0->dev_flags & IDE_DFLAG_PRESENT) == 0)
 748                 return;
 749
 750         /* If the models don't match they are not the same product */
 751         if (strcmp((char *)&dev0->id[ATA_ID_PROD],
 752                    (char *)&dev1->id[ATA_ID_PROD]))
 753                 return;
 754
 755         /* Serial numbers do not match */
 756         if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
 757                     (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
 758                 return;
 759
 760         /* No serial number, thankfully very rare for CF */
 761         if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
 762                 return;
 763
 764         /* Appears to be an IDE flash adapter with decode bugs */
 765         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 766
 767         dev1->dev_flags &= ~IDE_DFLAG_PRESENT;
 768 }
 769
 770 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 771
 772 static int ide_probe_port(ide_hwif_t *hwif)
 773 {
 774         unsigned long flags;
 775         unsigned int irqd;
 776         int unit, rc = -ENODEV;
 777
 778         BUG_ON(hwif->present);
 779
 780         if ((hwif->drives[0].dev_flags & IDE_DFLAG_NOPROBE) &&
 781             (hwif->drives[1].dev_flags & IDE_DFLAG_NOPROBE))
 782                 return -EACCES;
 783
 784         /*
 785          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 786          * we'll install our IRQ driver much later...
 787          */
 788         irqd = hwif->irq;
 789         if (irqd)
 790                 disable_irq(hwif->irq);
 791
 792         local_irq_set(flags);
 793
 794         if (ide_port_wait_ready(hwif) == -EBUSY)
 795                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 796
 797         /*
 798          * Second drive should only exist if first drive was found,
 799          * but a lot of cdrom drives are configured as single slaves.
 800          */
 801         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 802                 ide_drive_t *drive = &hwif->drives[unit];
 803
 804                 (void) probe_for_drive(drive);
 805                 if (drive->dev_flags & IDE_DFLAG_PRESENT)
 806                         rc = 0;
 807         }
 808
 809         local_irq_restore(flags);
 810
 811         /*
 812          * Use cached IRQ number. It might be (and is...) changed by probe
 813          * code above
 814          */
 815         if (irqd)
 816                 enable_irq(irqd);
 817
 818         return rc;
 819 }
 820
 821 static void ide_port_tune_devices(ide_hwif_t *hwif)
 822 {
 823         const struct ide_port_ops *port_ops = hwif->port_ops;
 824         int unit;
 825
 826         for (unit = 0; unit < MAX_DRIVES; unit++) {
 827                 ide_drive_t *drive = &hwif->drives[unit];
 828
 829                 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
 830                         if (port_ops && port_ops->quirkproc)
 831                                 port_ops->quirkproc(drive);
 832                 }
 833         }
 834
 835         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 836                 ide_drive_t *drive = &hwif->drives[unit];
 837
 838                 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
 839                         ide_set_max_pio(drive);
 840
 841                         drive->dev_flags |= IDE_DFLAG_NICE1;
 842
 843                         if (hwif->dma_ops)
 844                                 ide_set_dma(drive);
 845                 }
 846         }
 847
 848         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 849                 ide_drive_t *drive = &hwif->drives[unit];
 850
 851                 if ((hwif->host_flags & IDE_HFLAG_NO_IO_32BIT) ||
 852                     drive->id[ATA_ID_DWORD_IO])
 853                         drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
 854                 else
 855                         drive->dev_flags &= ~IDE_DFLAG_NO_IO_32BIT;
 856         }
 857 }
 858
 859 /*
 860  * save_match() is used to simplify logic in init_irq() below.
 861  *
 862  * A loophole here is that we may not know about a particular
 863  * hwif's irq until after that hwif is actually probed/initialized..
 864  * This could be a problem for the case where an hwif is on a
 865  * dual interface that requires serialization (eg. cmd640) and another
 866  * hwif using one of the same irqs is initialized beforehand.
 867  *
 868  * This routine detects and reports such situations, but does not fix them.
 869  */
 870 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 871 {
 872         ide_hwif_t *m = *match;
 873
 874         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 875                 if (!new->hwgroup)
 876                         return;
 877                 printk(KERN_WARNING "%s: potential IRQ problem with %s and %s\n",
 878                         hwif->name, new->name, m->name);
 879         }
 880         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 881                 *match = new;
 882 }
 883
 884 /*
 885  * init request queue
 886  */
 887 static int ide_init_queue(ide_drive_t *drive)
 888 {
 889         struct request_queue *q;
 890         ide_hwif_t *hwif = HWIF(drive);
 891         int max_sectors = 256;
 892         int max_sg_entries = PRD_ENTRIES;
 893
 894         /*
 895          *      Our default set up assumes the normal IDE case,
 896          *      that is 64K segmenting, standard PRD setup
 897          *      and LBA28. Some drivers then impose their own
 898          *      limits and LBA48 we could raise it but as yet
 899          *      do not.
 900          */
 901
 902         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
 903         if (!q)
 904                 return 1;
 905
 906         q->queuedata = drive;
 907         blk_queue_segment_boundary(q, 0xffff);
 908
 909         if (hwif->rqsize < max_sectors)
 910                 max_sectors = hwif->rqsize;
 911         blk_queue_max_sectors(q, max_sectors);
 912
 913 #ifdef CONFIG_PCI
 914         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 915          * creates segments that don't completely match our boundary
 916          * requirements and thus need to be broken up again. Because it
 917          * doesn't align properly either, we may actually have to break up
 918          * to more segments than what was we got in the first place, a max
 919          * worst case is twice as many.
 920          * This will be fixed once we teach pci_map_sg() about our boundary
 921          * requirements, hopefully soon. *FIXME*
 922          */
 923         if (!PCI_DMA_BUS_IS_PHYS)
 924                 max_sg_entries >>= 1;
 925 #endif /* CONFIG_PCI */
 926
 927         blk_queue_max_hw_segments(q, max_sg_entries);
 928         blk_queue_max_phys_segments(q, max_sg_entries);
 929
 930         /* assign drive queue */
 931         drive->queue = q;
 932
 933         /* needs drive->queue to be set */
 934         ide_toggle_bounce(drive, 1);
 935
 936         return 0;
 937 }
 938
 939 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
 940 {
 941         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
 942
 943         spin_lock_irq(&ide_lock);
 944         if (!hwgroup->drive) {
 945                 /* first drive for hwgroup. */
 946                 drive->next = drive;
 947                 hwgroup->drive = drive;
 948                 hwgroup->hwif = HWIF(hwgroup->drive);
 949         } else {
 950                 drive->next = hwgroup->drive->next;
 951                 hwgroup->drive->next = drive;
 952         }
 953         spin_unlock_irq(&ide_lock);
 954 }
 955
 956 /*
 957  * For any present drive:
 958  * - allocate the block device queue
 959  * - link drive into the hwgroup
 960  */
 961 static void ide_port_setup_devices(ide_hwif_t *hwif)
 962 {
 963         int i;
 964
 965         mutex_lock(&ide_cfg_mtx);
 966         for (i = 0; i < MAX_DRIVES; i++) {
 967                 ide_drive_t *drive = &hwif->drives[i];
 968
 969                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 970                         continue;
 971
 972                 if (ide_init_queue(drive)) {
 973                         printk(KERN_ERR "ide: failed to init %s\n",
 974                                         drive->name);
 975                         continue;
 976                 }
 977
 978                 ide_add_drive_to_hwgroup(drive);
 979         }
 980         mutex_unlock(&ide_cfg_mtx);
 981 }
 982
 983 static ide_hwif_t *ide_ports[MAX_HWIFS];
 984
 985 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
 986 {
 987         ide_hwgroup_t *hwgroup = hwif->hwgroup;
 988
 989         ide_ports[hwif->index] = NULL;
 990
 991         spin_lock_irq(&ide_lock);
 992         /*
 993          * Remove us from the hwgroup, and free
 994          * the hwgroup if we were the only member
 995          */
 996         if (hwif->next == hwif) {
 997                 BUG_ON(hwgroup->hwif != hwif);
 998                 kfree(hwgroup);
 999         } else {
1000                 /* There is another interface in hwgroup.
1001                  * Unlink us, and set hwgroup->drive and ->hwif to
1002                  * something sane.
1003                  */
1004                 ide_hwif_t *g = hwgroup->hwif;
1005
1006                 while (g->next != hwif)
1007                         g = g->next;
1008                 g->next = hwif->next;
1009                 if (hwgroup->hwif == hwif) {
1010                         /* Chose a random hwif for hwgroup->hwif.
1011                          * It's guaranteed that there are no drives
1012                          * left in the hwgroup.
1013                          */
1014                         BUG_ON(hwgroup->drive != NULL);
1015                         hwgroup->hwif = g;
1016                 }
1017                 BUG_ON(hwgroup->hwif == hwif);
1018         }
1019         spin_unlock_irq(&ide_lock);
1020 }
1021
1022 /*
1023  * This routine sets up the irq for an ide interface, and creates a new
1024  * hwgroup for the irq/hwif if none was previously assigned.
1025  *
1026  * Much of the code is for correctly detecting/handling irq sharing
1027  * and irq serialization situations.  This is somewhat complex because
1028  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1029  */
1030 static int init_irq (ide_hwif_t *hwif)
1031 {
1032         struct ide_io_ports *io_ports = &hwif->io_ports;
1033         unsigned int index;
1034         ide_hwgroup_t *hwgroup;
1035         ide_hwif_t *match = NULL;
1036
1037         mutex_lock(&ide_cfg_mtx);
1038         hwif->hwgroup = NULL;
1039
1040         /*
1041          * Group up with any other hwifs that share our irq(s).
1042          */
1043         for (index = 0; index < MAX_HWIFS; index++) {
1044                 ide_hwif_t *h = ide_ports[index];
1045
1046                 if (h && h->hwgroup) {  /* scan only initialized ports */
1047                         if (hwif->irq == h->irq) {
1048                                 hwif->sharing_irq = h->sharing_irq = 1;
1049                                 if (hwif->chipset != ide_pci ||
1050                                     h->chipset != ide_pci) {
1051                                         save_match(hwif, h, &match);
1052                                 }
1053                         }
1054                         if (hwif->serialized) {
1055                                 if (hwif->mate && hwif->mate->irq == h->irq)
1056                                         save_match(hwif, h, &match);
1057                         }
1058                         if (h->serialized) {
1059                                 if (h->mate && hwif->irq == h->mate->irq)
1060                                         save_match(hwif, h, &match);
1061                         }
1062                 }
1063         }
1064
1065         /*
1066          * If we are still without a hwgroup, then form a new one
1067          */
1068         if (match) {
1069                 hwgroup = match->hwgroup;
1070                 hwif->hwgroup = hwgroup;
1071                 /*
1072                  * Link us into the hwgroup.
1073                  * This must be done early, do ensure that unexpected_intr
1074                  * can find the hwif and prevent irq storms.
1075                  * No drives are attached to the new hwif, choose_drive
1076                  * can't do anything stupid (yet).
1077                  * Add ourself as the 2nd entry to the hwgroup->hwif
1078                  * linked list, the first entry is the hwif that owns
1079                  * hwgroup->handler - do not change that.
1080                  */
1081                 spin_lock_irq(&ide_lock);
1082                 hwif->next = hwgroup->hwif->next;
1083                 hwgroup->hwif->next = hwif;
1084                 BUG_ON(hwif->next == hwif);
1085                 spin_unlock_irq(&ide_lock);
1086         } else {
1087                 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1088                                        hwif_to_node(hwif));
1089                 if (hwgroup == NULL)
1090                         goto out_up;
1091
1092                 hwif->hwgroup = hwgroup;
1093                 hwgroup->hwif = hwif->next = hwif;
1094
1095                 init_timer(&hwgroup->timer);
1096                 hwgroup->timer.function = &ide_timer_expiry;
1097                 hwgroup->timer.data = (unsigned long) hwgroup;
1098         }
1099
1100         ide_ports[hwif->index] = hwif;
1101
1102         /*
1103          * Allocate the irq, if not already obtained for another hwif
1104          */
1105         if (!match || match->irq != hwif->irq) {
1106                 int sa = 0;
1107 #if defined(__mc68000__)
1108                 sa = IRQF_SHARED;
1109 #endif /* __mc68000__ */
1110
1111                 if (hwif->chipset == ide_pci || hwif->chipset == ide_cmd646 ||
1112                     hwif->chipset == ide_ali14xx)
1113                         sa = IRQF_SHARED;
1114
1115                 if (io_ports->ctl_addr)
1116                         hwif->tp_ops->set_irq(hwif, 1);
1117
1118                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1119                         goto out_unlink;
1120         }
1121
1122         if (!hwif->rqsize) {
1123                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1124                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1125                         hwif->rqsize = 256;
1126                 else
1127                         hwif->rqsize = 65536;
1128         }
1129
1130 #if !defined(__mc68000__)
1131         printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1132                 io_ports->data_addr, io_ports->status_addr,
1133                 io_ports->ctl_addr, hwif->irq);
1134 #else
1135         printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
1136                 io_ports->data_addr, hwif->irq);
1137 #endif /* __mc68000__ */
1138         if (match)
1139                 printk(KERN_CONT " (%sed with %s)",
1140                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1141         printk(KERN_CONT "\n");
1142
1143         mutex_unlock(&ide_cfg_mtx);
1144         return 0;
1145 out_unlink:
1146         ide_remove_port_from_hwgroup(hwif);
1147 out_up:
1148         mutex_unlock(&ide_cfg_mtx);
1149         return 1;
1150 }
1151
1152 static int ata_lock(dev_t dev, void *data)
1153 {
1154         /* FIXME: we want to pin hwif down */
1155         return 0;
1156 }
1157
1158 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1159 {
1160         ide_hwif_t *hwif = data;
1161         int unit = *part >> PARTN_BITS;
1162         ide_drive_t *drive = &hwif->drives[unit];
1163
1164         if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
1165                 return NULL;
1166
1167         if (drive->media == ide_disk)
1168                 request_module("ide-disk");
1169         if (drive->dev_flags & IDE_DFLAG_SCSI)
1170                 request_module("ide-scsi");
1171         if (drive->media == ide_cdrom || drive->media == ide_optical)
1172                 request_module("ide-cd");
1173         if (drive->media == ide_tape)
1174                 request_module("ide-tape");
1175         if (drive->media == ide_floppy)
1176                 request_module("ide-floppy");
1177
1178         return NULL;
1179 }
1180
1181 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1182 {
1183         struct gendisk *p = data;
1184         *part &= (1 << PARTN_BITS) - 1;
1185         return &disk_to_dev(p)->kobj;
1186 }
1187
1188 static int exact_lock(dev_t dev, void *data)
1189 {
1190         struct gendisk *p = data;
1191
1192         if (!get_disk(p))
1193                 return -1;
1194         return 0;
1195 }
1196
1197 void ide_register_region(struct gendisk *disk)
1198 {
1199         blk_register_region(MKDEV(disk->major, disk->first_minor),
1200                             disk->minors, NULL, exact_match, exact_lock, disk);
1201 }
1202
1203 EXPORT_SYMBOL_GPL(ide_register_region);
1204
1205 void ide_unregister_region(struct gendisk *disk)
1206 {
1207         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1208                               disk->minors);
1209 }
1210
1211 EXPORT_SYMBOL_GPL(ide_unregister_region);
1212
1213 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1214 {
1215         ide_hwif_t *hwif = drive->hwif;
1216         unsigned int unit = drive->dn & 1;
1217
1218         disk->major = hwif->major;
1219         disk->first_minor = unit << PARTN_BITS;
1220         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1221         disk->queue = drive->queue;
1222 }
1223
1224 EXPORT_SYMBOL_GPL(ide_init_disk);
1225
1226 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1227 {
1228         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1229
1230         if (drive == drive->next) {
1231                 /* special case: last drive from hwgroup. */
1232                 BUG_ON(hwgroup->drive != drive);
1233                 hwgroup->drive = NULL;
1234         } else {
1235                 ide_drive_t *walk;
1236
1237                 walk = hwgroup->drive;
1238                 while (walk->next != drive)
1239                         walk = walk->next;
1240                 walk->next = drive->next;
1241                 if (hwgroup->drive == drive) {
1242                         hwgroup->drive = drive->next;
1243                         hwgroup->hwif = hwgroup->drive->hwif;
1244                 }
1245         }
1246         BUG_ON(hwgroup->drive == drive);
1247 }
1248
1249 static void drive_release_dev (struct device *dev)
1250 {
1251         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1252
1253         ide_proc_unregister_device(drive);
1254
1255         spin_lock_irq(&ide_lock);
1256         ide_remove_drive_from_hwgroup(drive);
1257         kfree(drive->id);
1258         drive->id = NULL;
1259         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
1260         /* Messed up locking ... */
1261         spin_unlock_irq(&ide_lock);
1262         blk_cleanup_queue(drive->queue);
1263         spin_lock_irq(&ide_lock);
1264         drive->queue = NULL;
1265         spin_unlock_irq(&ide_lock);
1266
1267         complete(&drive->gendev_rel_comp);
1268 }
1269
1270 static int hwif_init(ide_hwif_t *hwif)
1271 {
1272         int old_irq;
1273
1274         if (!hwif->irq) {
1275                 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1276                 if (!hwif->irq) {
1277                         printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
1278                         return 0;
1279                 }
1280         }
1281
1282         if (register_blkdev(hwif->major, hwif->name))
1283                 return 0;
1284
1285         if (!hwif->sg_max_nents)
1286                 hwif->sg_max_nents = PRD_ENTRIES;
1287
1288         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1289                                  GFP_KERNEL);
1290         if (!hwif->sg_table) {
1291                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1292                 goto out;
1293         }
1294
1295         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1296
1297         if (init_irq(hwif) == 0)
1298                 goto done;
1299
1300         old_irq = hwif->irq;
1301         /*
1302          *      It failed to initialise. Find the default IRQ for
1303          *      this port and try that.
1304          */
1305         hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1306         if (!hwif->irq) {
1307                 printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
1308                         hwif->name, old_irq);
1309                 goto out;
1310         }
1311         if (init_irq(hwif)) {
1312                 printk(KERN_ERR "%s: probed IRQ %d and default IRQ %d failed\n",
1313                         hwif->name, old_irq, hwif->irq);
1314                 goto out;
1315         }
1316         printk(KERN_WARNING "%s: probed IRQ %d failed, using default\n",
1317                 hwif->name, hwif->irq);
1318
1319 done:
1320         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1321                             THIS_MODULE, ata_probe, ata_lock, hwif);
1322         return 1;
1323
1324 out:
1325         unregister_blkdev(hwif->major, hwif->name);
1326         return 0;
1327 }
1328
1329 static void hwif_register_devices(ide_hwif_t *hwif)
1330 {
1331         unsigned int i;
1332
1333         for (i = 0; i < MAX_DRIVES; i++) {
1334                 ide_drive_t *drive = &hwif->drives[i];
1335                 struct device *dev = &drive->gendev;
1336                 int ret;
1337
1338                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
1339                         continue;
1340
1341                 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1342                 dev->parent = &hwif->gendev;
1343                 dev->bus = &ide_bus_type;
1344                 dev->driver_data = drive;
1345                 dev->release = drive_release_dev;
1346
1347                 ret = device_register(dev);
1348                 if (ret < 0)
1349                         printk(KERN_WARNING "IDE: %s: device_register error: "
1350                                             "%d\n", __func__, ret);
1351         }
1352 }
1353
1354 static void ide_port_init_devices(ide_hwif_t *hwif)
1355 {
1356         const struct ide_port_ops *port_ops = hwif->port_ops;
1357         int i;
1358
1359         for (i = 0; i < MAX_DRIVES; i++) {
1360                 ide_drive_t *drive = &hwif->drives[i];
1361
1362                 drive->dn = i + hwif->channel * 2;
1363
1364                 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1365                         drive->io_32bit = 1;
1366                 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1367                         drive->dev_flags |= IDE_DFLAG_UNMASK;
1368                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1369                         drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
1370
1371                 if (port_ops && port_ops->init_dev)
1372                         port_ops->init_dev(drive);
1373         }
1374 }
1375
1376 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1377                           const struct ide_port_info *d)
1378 {
1379         hwif->channel = port;
1380
1381         if (d->chipset)
1382                 hwif->chipset = d->chipset;
1383
1384         if (d->init_iops)
1385                 d->init_iops(hwif);
1386
1387         if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1388             (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1389                 hwif->irq = port ? 15 : 14;
1390
1391         /* ->host_flags may be set by ->init_iops (or even earlier...) */
1392         hwif->host_flags |= d->host_flags;
1393         hwif->pio_mask = d->pio_mask;
1394
1395         if (d->tp_ops)
1396                 hwif->tp_ops = d->tp_ops;
1397
1398         /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1399         if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1400                 hwif->port_ops = d->port_ops;
1401
1402         hwif->swdma_mask = d->swdma_mask;
1403         hwif->mwdma_mask = d->mwdma_mask;
1404         hwif->ultra_mask = d->udma_mask;
1405
1406         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1407                 int rc;
1408
1409                 if (d->init_dma)
1410                         rc = d->init_dma(hwif, d);
1411                 else
1412                         rc = ide_hwif_setup_dma(hwif, d);
1413
1414                 if (rc < 0) {
1415                         printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1416                         hwif->dma_base = 0;
1417                         hwif->swdma_mask = 0;
1418                         hwif->mwdma_mask = 0;
1419                         hwif->ultra_mask = 0;
1420                 } else if (d->dma_ops)
1421                         hwif->dma_ops = d->dma_ops;
1422         }
1423
1424         if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1425             ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1426                 if (hwif->mate)
1427                         hwif->mate->serialized = hwif->serialized = 1;
1428         }
1429
1430         if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1431                 hwif->rqsize = 256;
1432
1433         /* call chipset specific routine for each enabled port */
1434         if (d->init_hwif)
1435                 d->init_hwif(hwif);
1436 }
1437
1438 static void ide_port_cable_detect(ide_hwif_t *hwif)
1439 {
1440         const struct ide_port_ops *port_ops = hwif->port_ops;
1441
1442         if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1443                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1444                         hwif->cbl = port_ops->cable_detect(hwif);
1445         }
1446 }
1447
1448 static ssize_t store_delete_devices(struct device *portdev,
1449                                     struct device_attribute *attr,
1450                                     const char *buf, size_t n)
1451 {
1452         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1453
1454         if (strncmp(buf, "1", n))
1455                 return -EINVAL;
1456
1457         ide_port_unregister_devices(hwif);
1458
1459         return n;
1460 };
1461
1462 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1463
1464 static ssize_t store_scan(struct device *portdev,
1465                           struct device_attribute *attr,
1466                           const char *buf, size_t n)
1467 {
1468         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1469
1470         if (strncmp(buf, "1", n))
1471                 return -EINVAL;
1472
1473         ide_port_unregister_devices(hwif);
1474         ide_port_scan(hwif);
1475
1476         return n;
1477 };
1478
1479 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1480
1481 static struct device_attribute *ide_port_attrs[] = {
1482         &dev_attr_delete_devices,
1483         &dev_attr_scan,
1484         NULL
1485 };
1486
1487 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1488 {
1489         int i, uninitialized_var(rc);
1490
1491         for (i = 0; ide_port_attrs[i]; i++) {
1492                 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1493                 if (rc)
1494                         break;
1495         }
1496
1497         return rc;
1498 }
1499
1500 static unsigned int ide_indexes;
1501
1502 /**
1503  *      ide_find_port_slot      -       find free port slot
1504  *      @d: IDE port info
1505  *
1506  *      Return the new port slot index or -ENOENT if we are out of free slots.
1507  */
1508
1509 static int ide_find_port_slot(const struct ide_port_info *d)
1510 {
1511         int idx = -ENOENT;
1512         u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1513         u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
1514
1515         /*
1516          * Claim an unassigned slot.
1517          *
1518          * Give preference to claiming other slots before claiming ide0/ide1,
1519          * just in case there's another interface yet-to-be-scanned
1520          * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1521          *
1522          * Unless there is a bootable card that does not use the standard
1523          * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1524          */
1525         mutex_lock(&ide_cfg_mtx);
1526         if (bootable) {
1527                 if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1528                         idx = ffz(ide_indexes | i);
1529         } else {
1530                 if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1531                         idx = ffz(ide_indexes | 3);
1532                 else if ((ide_indexes & 3) != 3)
1533                         idx = ffz(ide_indexes);
1534         }
1535         if (idx >= 0)
1536                 ide_indexes |= (1 << idx);
1537         mutex_unlock(&ide_cfg_mtx);
1538
1539         return idx;
1540 }
1541
1542 static void ide_free_port_slot(int idx)
1543 {
1544         mutex_lock(&ide_cfg_mtx);
1545         ide_indexes &= ~(1 << idx);
1546         mutex_unlock(&ide_cfg_mtx);
1547 }
1548
1549 struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
1550 {
1551         struct ide_host *host;
1552         int i;
1553
1554         host = kzalloc(sizeof(*host), GFP_KERNEL);
1555         if (host == NULL)
1556                 return NULL;
1557
1558         for (i = 0; i < MAX_HOST_PORTS; i++) {
1559                 ide_hwif_t *hwif;
1560                 int idx;
1561
1562                 if (hws[i] == NULL)
1563                         continue;
1564
1565                 hwif = kzalloc(sizeof(*hwif), GFP_KERNEL);
1566                 if (hwif == NULL)
1567                         continue;
1568
1569                 idx = ide_find_port_slot(d);
1570                 if (idx < 0) {
1571                         printk(KERN_ERR "%s: no free slot for interface\n",
1572                                         d ? d->name : "ide");
1573                         kfree(hwif);
1574                         continue;
1575                 }
1576
1577                 ide_init_port_data(hwif, idx);
1578
1579                 hwif->host = host;
1580
1581                 host->ports[i] = hwif;
1582                 host->n_ports++;
1583         }
1584
1585         if (host->n_ports == 0) {
1586                 kfree(host);
1587                 return NULL;
1588         }
1589
1590         if (hws[0])
1591                 host->dev[0] = hws[0]->dev;
1592
1593         if (d) {
1594                 host->init_chipset = d->init_chipset;
1595                 host->host_flags = d->host_flags;
1596         }
1597
1598         return host;
1599 }
1600 EXPORT_SYMBOL_GPL(ide_host_alloc);
1601
1602 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1603                       hw_regs_t **hws)
1604 {
1605         ide_hwif_t *hwif, *mate = NULL;
1606         int i, j = 0;
1607
1608         for (i = 0; i < MAX_HOST_PORTS; i++) {
1609                 hwif = host->ports[i];
1610
1611                 if (hwif == NULL) {
1612                         mate = NULL;
1613                         continue;
1614                 }
1615
1616                 ide_init_port_hw(hwif, hws[i]);
1617                 ide_port_apply_params(hwif);
1618
1619                 if (d == NULL) {
1620                         mate = NULL;
1621                 } else {
1622                         if ((i & 1) && mate) {
1623                                 hwif->mate = mate;
1624                                 mate->mate = hwif;
1625                         }
1626
1627                         mate = (i & 1) ? NULL : hwif;
1628
1629                         ide_init_port(hwif, i & 1, d);
1630                         ide_port_cable_detect(hwif);
1631                 }
1632
1633                 ide_port_init_devices(hwif);
1634         }
1635
1636         for (i = 0; i < MAX_HOST_PORTS; i++) {
1637                 hwif = host->ports[i];
1638
1639                 if (hwif == NULL)
1640                         continue;
1641
1642                 if (ide_probe_port(hwif) == 0)
1643                         hwif->present = 1;
1644
1645                 if (hwif->chipset != ide_4drives || !hwif->mate ||
1646                     !hwif->mate->present)
1647                         ide_register_port(hwif);
1648
1649                 if (hwif->present)
1650                         ide_port_tune_devices(hwif);
1651         }
1652
1653         for (i = 0; i < MAX_HOST_PORTS; i++) {
1654                 hwif = host->ports[i];
1655
1656                 if (hwif == NULL)
1657                         continue;
1658
1659                 if (hwif_init(hwif) == 0) {
1660                         printk(KERN_INFO "%s: failed to initialize IDE "
1661                                          "interface\n", hwif->name);
1662                         hwif->present = 0;
1663                         continue;
1664                 }
1665
1666                 j++;
1667
1668                 if (hwif->present)
1669                         ide_port_setup_devices(hwif);
1670
1671                 ide_acpi_init(hwif);
1672
1673                 if (hwif->present)
1674                         ide_acpi_port_init_devices(hwif);
1675         }
1676
1677         for (i = 0; i < MAX_HOST_PORTS; i++) {
1678                 hwif = host->ports[i];
1679
1680                 if (hwif == NULL)
1681                         continue;
1682
1683                 if (hwif->chipset == ide_unknown)
1684                         hwif->chipset = ide_generic;
1685
1686                 if (hwif->present)
1687                         hwif_register_devices(hwif);
1688         }
1689
1690         for (i = 0; i < MAX_HOST_PORTS; i++) {
1691                 hwif = host->ports[i];
1692
1693                 if (hwif == NULL)
1694                         continue;
1695
1696                 ide_sysfs_register_port(hwif);
1697                 ide_proc_register_port(hwif);
1698
1699                 if (hwif->present)
1700                         ide_proc_port_register_devices(hwif);
1701         }
1702
1703         return j ? 0 : -1;
1704 }
1705 EXPORT_SYMBOL_GPL(ide_host_register);
1706
1707 int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
1708                  struct ide_host **hostp)
1709 {
1710         struct ide_host *host;
1711         int rc;
1712
1713         host = ide_host_alloc(d, hws);
1714         if (host == NULL)
1715                 return -ENOMEM;
1716
1717         rc = ide_host_register(host, d, hws);
1718         if (rc) {
1719                 ide_host_free(host);
1720                 return rc;
1721         }
1722
1723         if (hostp)
1724                 *hostp = host;
1725
1726         return 0;
1727 }
1728 EXPORT_SYMBOL_GPL(ide_host_add);
1729
1730 void ide_host_free(struct ide_host *host)
1731 {
1732         ide_hwif_t *hwif;
1733         int i;
1734
1735         for (i = 0; i < MAX_HOST_PORTS; i++) {
1736                 hwif = host->ports[i];
1737
1738                 if (hwif == NULL)
1739                         continue;
1740
1741                 ide_free_port_slot(hwif->index);
1742                 kfree(hwif);
1743         }
1744
1745         kfree(host);
1746 }
1747 EXPORT_SYMBOL_GPL(ide_host_free);
1748
1749 void ide_host_remove(struct ide_host *host)
1750 {
1751         int i;
1752
1753         for (i = 0; i < MAX_HOST_PORTS; i++) {
1754                 if (host->ports[i])
1755                         ide_unregister(host->ports[i]);
1756         }
1757
1758         ide_host_free(host);
1759 }
1760 EXPORT_SYMBOL_GPL(ide_host_remove);
1761
1762 void ide_port_scan(ide_hwif_t *hwif)
1763 {
1764         ide_port_apply_params(hwif);
1765         ide_port_cable_detect(hwif);
1766         ide_port_init_devices(hwif);
1767
1768         if (ide_probe_port(hwif) < 0)
1769                 return;
1770
1771         hwif->present = 1;
1772
1773         ide_port_tune_devices(hwif);
1774         ide_acpi_port_init_devices(hwif);
1775         ide_port_setup_devices(hwif);
1776         hwif_register_devices(hwif);
1777         ide_proc_port_register_devices(hwif);
1778 }
1779 EXPORT_SYMBOL_GPL(ide_port_scan);
1780
1781 static void ide_legacy_init_one(hw_regs_t **hws, hw_regs_t *hw,
1782                                 u8 port_no, const struct ide_port_info *d,
1783                                 unsigned long config)
1784 {
1785         unsigned long base, ctl;
1786         int irq;
1787
1788         if (port_no == 0) {
1789                 base = 0x1f0;
1790                 ctl  = 0x3f6;
1791                 irq  = 14;
1792         } else {
1793                 base = 0x170;
1794                 ctl  = 0x376;
1795                 irq  = 15;
1796         }
1797
1798         if (!request_region(base, 8, d->name)) {
1799                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1800                                 d->name, base, base + 7);
1801                 return;
1802         }
1803
1804         if (!request_region(ctl, 1, d->name)) {
1805                 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1806                                 d->name, ctl);
1807                 release_region(base, 8);
1808                 return;
1809         }
1810
1811         ide_std_init_ports(hw, base, ctl);
1812         hw->irq = irq;
1813         hw->chipset = d->chipset;
1814         hw->config = config;
1815
1816         hws[port_no] = hw;
1817 }
1818
1819 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
1820 {
1821         hw_regs_t hw[2], *hws[] = { NULL, NULL, NULL, NULL };
1822
1823         memset(&hw, 0, sizeof(hw));
1824
1825         if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
1826                 ide_legacy_init_one(hws, &hw[0], 0, d, config);
1827         ide_legacy_init_one(hws, &hw[1], 1, d, config);
1828
1829         if (hws[0] == NULL && hws[1] == NULL &&
1830             (d->host_flags & IDE_HFLAG_SINGLE))
1831                 return -ENOENT;
1832
1833         return ide_host_add(d, hws, NULL);
1834 }
1835 EXPORT_SYMBOL_GPL(ide_legacy_device_add);