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 static ide_hwif_t ide_hwifs[MAX_HWIFS]; /* master data repository */
  43
  44 /**
  45  *      generic_id              -       add a generic drive id
  46  *      @drive: drive to make an ID block for
  47  *
  48  *      Add a fake id field to the drive we are passed. This allows
  49  *      use to skip a ton of NULL checks (which people always miss)
  50  *      and make drive properties unconditional outside of this file
  51  */
  52
  53 static void generic_id(ide_drive_t *drive)
  54 {
  55         drive->id->cyls = drive->cyl;
  56         drive->id->heads = drive->head;
  57         drive->id->sectors = drive->sect;
  58         drive->id->cur_cyls = drive->cyl;
  59         drive->id->cur_heads = drive->head;
  60         drive->id->cur_sectors = drive->sect;
  61 }
  62
  63 static void ide_disk_init_chs(ide_drive_t *drive)
  64 {
  65         struct hd_driveid *id = drive->id;
  66
  67         /* Extract geometry if we did not already have one for the drive */
  68         if (!drive->cyl || !drive->head || !drive->sect) {
  69                 drive->cyl  = drive->bios_cyl  = id->cyls;
  70                 drive->head = drive->bios_head = id->heads;
  71                 drive->sect = drive->bios_sect = id->sectors;
  72         }
  73
  74         /* Handle logical geometry translation by the drive */
  75         if ((id->field_valid & 1) && id->cur_cyls &&
  76             id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
  77                 drive->cyl  = id->cur_cyls;
  78                 drive->head = id->cur_heads;
  79                 drive->sect = id->cur_sectors;
  80         }
  81
  82         /* Use physical geometry if what we have still makes no sense */
  83         if (drive->head > 16 && id->heads && id->heads <= 16) {
  84                 drive->cyl  = id->cyls;
  85                 drive->head = id->heads;
  86                 drive->sect = id->sectors;
  87         }
  88 }
  89
  90 static void ide_disk_init_mult_count(ide_drive_t *drive)
  91 {
  92         struct hd_driveid *id = drive->id;
  93
  94         drive->mult_count = 0;
  95         if (id->max_multsect) {
  96 #ifdef CONFIG_IDEDISK_MULTI_MODE
  97                 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
  98                 id->multsect_valid = id->multsect ? 1 : 0;
  99                 drive->mult_req = id->multsect_valid ? id->max_multsect : 0;
 100                 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
 101 #else   /* original, pre IDE-NFG, per request of AC */
 102                 drive->mult_req = 0;
 103                 if (drive->mult_req > id->max_multsect)
 104                         drive->mult_req = id->max_multsect;
 105                 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
 106                         drive->special.b.set_multmode = 1;
 107 #endif
 108         }
 109 }
 110
 111 /**
 112  *      do_identify     -       identify a drive
 113  *      @drive: drive to identify
 114  *      @cmd: command used
 115  *
 116  *      Called when we have issued a drive identify command to
 117  *      read and parse the results. This function is run with
 118  *      interrupts disabled.
 119  */
 120
 121 static inline void do_identify (ide_drive_t *drive, u8 cmd)
 122 {
 123         ide_hwif_t *hwif = HWIF(drive);
 124         int bswap = 1;
 125         struct hd_driveid *id;
 126
 127         id = drive->id;
 128         /* read 512 bytes of id info */
 129         hwif->input_data(drive, NULL, id, SECTOR_SIZE);
 130
 131         drive->id_read = 1;
 132         local_irq_enable();
 133 #ifdef DEBUG
 134         printk(KERN_INFO "%s: dumping identify data\n", drive->name);
 135         ide_dump_identify((u8 *)id);
 136 #endif
 137         ide_fix_driveid(id);
 138
 139 #if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
 140         /*
 141          * EATA SCSI controllers do a hardware ATA emulation:
 142          * Ignore them if there is a driver for them available.
 143          */
 144         if ((id->model[0] == 'P' && id->model[1] == 'M') ||
 145             (id->model[0] == 'S' && id->model[1] == 'K')) {
 146                 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
 147                 goto err_misc;
 148         }
 149 #endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */
 150
 151         /*
 152          *  WIN_IDENTIFY returns little-endian info,
 153          *  WIN_PIDENTIFY *usually* returns little-endian info.
 154          */
 155         if (cmd == WIN_PIDENTIFY) {
 156                 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
 157                  || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
 158                  || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
 159                         /* Vertos drives may still be weird */
 160                         bswap ^= 1;
 161         }
 162         ide_fixstring(id->model,     sizeof(id->model),     bswap);
 163         ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
 164         ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
 165
 166         /* we depend on this a lot! */
 167         id->model[sizeof(id->model)-1] = '\0';
 168
 169         if (strstr(id->model, "E X A B Y T E N E S T"))
 170                 goto err_misc;
 171
 172         printk("%s: %s, ", drive->name, id->model);
 173         drive->present = 1;
 174         drive->dead = 0;
 175
 176         /*
 177          * Check for an ATAPI device
 178          */
 179         if (cmd == WIN_PIDENTIFY) {
 180                 u8 type = (id->config >> 8) & 0x1f;
 181                 printk("ATAPI ");
 182                 switch (type) {
 183                         case ide_floppy:
 184                                 if (!strstr(id->model, "CD-ROM")) {
 185                                         if (!strstr(id->model, "oppy") &&
 186                                             !strstr(id->model, "poyp") &&
 187                                             !strstr(id->model, "ZIP"))
 188                                                 printk("cdrom or floppy?, assuming ");
 189                                         if (drive->media != ide_cdrom) {
 190                                                 printk ("FLOPPY");
 191                                                 drive->removable = 1;
 192                                                 break;
 193                                         }
 194                                 }
 195                                 /* Early cdrom models used zero */
 196                                 type = ide_cdrom;
 197                         case ide_cdrom:
 198                                 drive->removable = 1;
 199 #ifdef CONFIG_PPC
 200                                 /* kludge for Apple PowerBook internal zip */
 201                                 if (!strstr(id->model, "CD-ROM") &&
 202                                     strstr(id->model, "ZIP")) {
 203                                         printk ("FLOPPY");
 204                                         type = ide_floppy;
 205                                         break;
 206                                 }
 207 #endif
 208                                 printk ("CD/DVD-ROM");
 209                                 break;
 210                         case ide_tape:
 211                                 printk ("TAPE");
 212                                 break;
 213                         case ide_optical:
 214                                 printk ("OPTICAL");
 215                                 drive->removable = 1;
 216                                 break;
 217                         default:
 218                                 printk("UNKNOWN (type %d)", type);
 219                                 break;
 220                 }
 221                 printk (" drive\n");
 222                 drive->media = type;
 223                 /* an ATAPI device ignores DRDY */
 224                 drive->ready_stat = 0;
 225                 return;
 226         }
 227
 228         /*
 229          * Not an ATAPI device: looks like a "regular" hard disk
 230          */
 231
 232         /*
 233          * 0x848a = CompactFlash device
 234          * These are *not* removable in Linux definition of the term
 235          */
 236
 237         if ((id->config != 0x848a) && (id->config & (1<<7)))
 238                 drive->removable = 1;
 239
 240         drive->media = ide_disk;
 241         printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
 242
 243         return;
 244
 245 err_misc:
 246         kfree(id);
 247         drive->present = 0;
 248         return;
 249 }
 250
 251 /**
 252  *      actual_try_to_identify  -       send ata/atapi identify
 253  *      @drive: drive to identify
 254  *      @cmd: command to use
 255  *
 256  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 257  *      and waits for a response.  It also monitors irqs while this is
 258  *      happening, in hope of automatically determining which one is
 259  *      being used by the interface.
 260  *
 261  *      Returns:        0  device was identified
 262  *                      1  device timed-out (no response to identify request)
 263  *                      2  device aborted the command (refused to identify itself)
 264  */
 265
 266 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 267 {
 268         ide_hwif_t *hwif = HWIF(drive);
 269         struct ide_io_ports *io_ports = &hwif->io_ports;
 270         int use_altstatus = 0, rc;
 271         unsigned long timeout;
 272         u8 s = 0, a = 0;
 273
 274         /* take a deep breath */
 275         msleep(50);
 276
 277         if (io_ports->ctl_addr) {
 278                 a = hwif->read_altstatus(hwif);
 279                 s = hwif->read_status(hwif);
 280                 if ((a ^ s) & ~INDEX_STAT)
 281                         /* ancient Seagate drives, broken interfaces */
 282                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
 283                                          "instead of ALTSTATUS(0x%02x)\n",
 284                                          drive->name, s, a);
 285                 else
 286                         /* use non-intrusive polling */
 287                         use_altstatus = 1;
 288         }
 289
 290         /* set features register for atapi
 291          * identify command to be sure of reply
 292          */
 293         if (cmd == WIN_PIDENTIFY) {
 294                 ide_task_t task;
 295
 296                 memset(&task, 0, sizeof(task));
 297                 /* disable DMA & overlap */
 298                 task.tf_flags = IDE_TFLAG_OUT_FEATURE;
 299
 300                 drive->hwif->tf_load(drive, &task);
 301         }
 302
 303         /* ask drive for ID */
 304         hwif->exec_command(hwif, cmd);
 305
 306         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 307         timeout += jiffies;
 308         do {
 309                 if (time_after(jiffies, timeout)) {
 310                         /* drive timed-out */
 311                         return 1;
 312                 }
 313                 /* give drive a breather */
 314                 msleep(50);
 315                 s = use_altstatus ? hwif->read_altstatus(hwif)
 316                                   : hwif->read_status(hwif);
 317         } while (s & BUSY_STAT);
 318
 319         /* wait for IRQ and DRQ_STAT */
 320         msleep(50);
 321         s = hwif->read_status(hwif);
 322
 323         if (OK_STAT(s, DRQ_STAT, BAD_R_STAT)) {
 324                 unsigned long flags;
 325
 326                 /* local CPU only; some systems need this */
 327                 local_irq_save(flags);
 328                 /* drive returned ID */
 329                 do_identify(drive, cmd);
 330                 /* drive responded with ID */
 331                 rc = 0;
 332                 /* clear drive IRQ */
 333                 (void)hwif->read_status(hwif);
 334                 local_irq_restore(flags);
 335         } else {
 336                 /* drive refused ID */
 337                 rc = 2;
 338         }
 339         return rc;
 340 }
 341
 342 /**
 343  *      try_to_identify -       try to identify a drive
 344  *      @drive: drive to probe
 345  *      @cmd: command to use
 346  *
 347  *      Issue the identify command and then do IRQ probing to
 348  *      complete the identification when needed by finding the
 349  *      IRQ the drive is attached to
 350  */
 351
 352 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 353 {
 354         ide_hwif_t *hwif = HWIF(drive);
 355         int retval;
 356         int autoprobe = 0;
 357         unsigned long cookie = 0;
 358
 359         /*
 360          * Disable device irq unless we need to
 361          * probe for it. Otherwise we'll get spurious
 362          * interrupts during the identify-phase that
 363          * the irq handler isn't expecting.
 364          */
 365         if (hwif->io_ports.ctl_addr) {
 366                 if (!hwif->irq) {
 367                         autoprobe = 1;
 368                         cookie = probe_irq_on();
 369                 }
 370                 hwif->set_irq(hwif, autoprobe);
 371         }
 372
 373         retval = actual_try_to_identify(drive, cmd);
 374
 375         if (autoprobe) {
 376                 int irq;
 377
 378                 hwif->set_irq(hwif, 0);
 379                 /* clear drive IRQ */
 380                 (void)hwif->read_status(hwif);
 381                 udelay(5);
 382                 irq = probe_irq_off(cookie);
 383                 if (!hwif->irq) {
 384                         if (irq > 0) {
 385                                 hwif->irq = irq;
 386                         } else {
 387                                 /* Mmmm.. multiple IRQs..
 388                                  * don't know which was ours
 389                                  */
 390                                 printk("%s: IRQ probe failed (0x%lx)\n",
 391                                         drive->name, cookie);
 392                         }
 393                 }
 394         }
 395         return retval;
 396 }
 397
 398 static int ide_busy_sleep(ide_hwif_t *hwif)
 399 {
 400         unsigned long timeout = jiffies + WAIT_WORSTCASE;
 401         u8 stat;
 402
 403         do {
 404                 msleep(50);
 405                 stat = hwif->read_status(hwif);
 406                 if ((stat & BUSY_STAT) == 0)
 407                         return 0;
 408         } while (time_before(jiffies, timeout));
 409
 410         return 1;
 411 }
 412
 413 /**
 414  *      do_probe                -       probe an IDE device
 415  *      @drive: drive to probe
 416  *      @cmd: command to use
 417  *
 418  *      do_probe() has the difficult job of finding a drive if it exists,
 419  *      without getting hung up if it doesn't exist, without trampling on
 420  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 421  *
 422  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 423  *      but does not respond right away, the probe will "hang in there"
 424  *      for the maximum wait time (about 30 seconds), otherwise it will
 425  *      exit much more quickly.
 426  *
 427  * Returns:     0  device was identified
 428  *              1  device timed-out (no response to identify request)
 429  *              2  device aborted the command (refused to identify itself)
 430  *              3  bad status from device (possible for ATAPI drives)
 431  *              4  probe was not attempted because failure was obvious
 432  */
 433
 434 static int do_probe (ide_drive_t *drive, u8 cmd)
 435 {
 436         ide_hwif_t *hwif = HWIF(drive);
 437         struct ide_io_ports *io_ports = &hwif->io_ports;
 438         int rc;
 439         u8 stat;
 440
 441         if (drive->present) {
 442                 /* avoid waiting for inappropriate probes */
 443                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
 444                         return 4;
 445         }
 446 #ifdef DEBUG
 447         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
 448                 drive->name, drive->present, drive->media,
 449                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
 450 #endif
 451
 452         /* needed for some systems
 453          * (e.g. crw9624 as drive0 with disk as slave)
 454          */
 455         msleep(50);
 456         SELECT_DRIVE(drive);
 457         msleep(50);
 458         if (hwif->INB(io_ports->device_addr) != drive->select.all &&
 459             !drive->present) {
 460                 if (drive->select.b.unit != 0) {
 461                         /* exit with drive0 selected */
 462                         SELECT_DRIVE(&hwif->drives[0]);
 463                         /* allow BUSY_STAT to assert & clear */
 464                         msleep(50);
 465                 }
 466                 /* no i/f present: mmm.. this should be a 4 -ml */
 467                 return 3;
 468         }
 469
 470         stat = hwif->read_status(hwif);
 471
 472         if (OK_STAT(stat, READY_STAT, BUSY_STAT) ||
 473             drive->present || cmd == WIN_PIDENTIFY) {
 474                 /* send cmd and wait */
 475                 if ((rc = try_to_identify(drive, cmd))) {
 476                         /* failed: try again */
 477                         rc = try_to_identify(drive,cmd);
 478                 }
 479
 480                 stat = hwif->read_status(hwif);
 481
 482                 if (stat == (BUSY_STAT | READY_STAT))
 483                         return 4;
 484
 485                 if (rc == 1 && cmd == WIN_PIDENTIFY) {
 486                         printk(KERN_ERR "%s: no response (status = 0x%02x), "
 487                                         "resetting drive\n", drive->name, stat);
 488                         msleep(50);
 489                         SELECT_DRIVE(drive);
 490                         msleep(50);
 491                         hwif->exec_command(hwif, WIN_SRST);
 492                         (void)ide_busy_sleep(hwif);
 493                         rc = try_to_identify(drive, cmd);
 494                 }
 495
 496                 /* ensure drive IRQ is clear */
 497                 stat = hwif->read_status(hwif);
 498
 499                 if (rc == 1)
 500                         printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
 501                                         drive->name, stat);
 502         } else {
 503                 /* not present or maybe ATAPI */
 504                 rc = 3;
 505         }
 506         if (drive->select.b.unit != 0) {
 507                 /* exit with drive0 selected */
 508                 SELECT_DRIVE(&hwif->drives[0]);
 509                 msleep(50);
 510                 /* ensure drive irq is clear */
 511                 (void)hwif->read_status(hwif);
 512         }
 513         return rc;
 514 }
 515
 516 /*
 517  *
 518  */
 519 static void enable_nest (ide_drive_t *drive)
 520 {
 521         ide_hwif_t *hwif = HWIF(drive);
 522         u8 stat;
 523
 524         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
 525         SELECT_DRIVE(drive);
 526         msleep(50);
 527         hwif->exec_command(hwif, EXABYTE_ENABLE_NEST);
 528
 529         if (ide_busy_sleep(hwif)) {
 530                 printk(KERN_CONT "failed (timeout)\n");
 531                 return;
 532         }
 533
 534         msleep(50);
 535
 536         stat = hwif->read_status(hwif);
 537
 538         if (!OK_STAT(stat, 0, BAD_STAT))
 539                 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
 540         else
 541                 printk(KERN_CONT "success\n");
 542
 543         /* if !(success||timed-out) */
 544         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 545                 /* look for ATAPI device */
 546                 (void) do_probe(drive, WIN_PIDENTIFY);
 547         }
 548 }
 549
 550 /**
 551  *      probe_for_drives        -       upper level drive probe
 552  *      @drive: drive to probe for
 553  *
 554  *      probe_for_drive() tests for existence of a given drive using do_probe()
 555  *      and presents things to the user as needed.
 556  *
 557  *      Returns:        0  no device was found
 558  *                      1  device was found (note: drive->present might
 559  *                         still be 0)
 560  */
 561
 562 static inline u8 probe_for_drive (ide_drive_t *drive)
 563 {
 564         /*
 565          *      In order to keep things simple we have an id
 566          *      block for all drives at all times. If the device
 567          *      is pre ATA or refuses ATA/ATAPI identify we
 568          *      will add faked data to this.
 569          *
 570          *      Also note that 0 everywhere means "can't do X"
 571          */
 572
 573         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
 574         drive->id_read = 0;
 575         if(drive->id == NULL)
 576         {
 577                 printk(KERN_ERR "ide: out of memory for id data.\n");
 578                 return 0;
 579         }
 580         strcpy(drive->id->model, "UNKNOWN");
 581
 582         /* skip probing? */
 583         if (!drive->noprobe)
 584         {
 585                 /* if !(success||timed-out) */
 586                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 587                         /* look for ATAPI device */
 588                         (void) do_probe(drive, WIN_PIDENTIFY);
 589                 }
 590                 if (!drive->present)
 591                         /* drive not found */
 592                         return 0;
 593                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
 594                         enable_nest(drive);
 595
 596                 /* identification failed? */
 597                 if (!drive->id_read) {
 598                         if (drive->media == ide_disk) {
 599                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 600                                         drive->name, drive->cyl,
 601                                         drive->head, drive->sect);
 602                         } else if (drive->media == ide_cdrom) {
 603                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 604                         } else {
 605                                 /* nuke it */
 606                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 607                                 drive->present = 0;
 608                         }
 609                 }
 610                 /* drive was found */
 611         }
 612         if(!drive->present)
 613                 return 0;
 614         /* The drive wasn't being helpful. Add generic info only */
 615         if (drive->id_read == 0) {
 616                 generic_id(drive);
 617                 return 1;
 618         }
 619
 620         if (drive->media == ide_disk) {
 621                 ide_disk_init_chs(drive);
 622                 ide_disk_init_mult_count(drive);
 623         }
 624
 625         return drive->present;
 626 }
 627
 628 static void hwif_release_dev (struct device *dev)
 629 {
 630         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 631
 632         complete(&hwif->gendev_rel_comp);
 633 }
 634
 635 static int ide_register_port(ide_hwif_t *hwif)
 636 {
 637         int ret;
 638
 639         /* register with global device tree */
 640         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 641         hwif->gendev.driver_data = hwif;
 642         if (hwif->gendev.parent == NULL) {
 643                 if (hwif->dev)
 644                         hwif->gendev.parent = hwif->dev;
 645                 else
 646                         /* Would like to do = &device_legacy */
 647                         hwif->gendev.parent = NULL;
 648         }
 649         hwif->gendev.release = hwif_release_dev;
 650         ret = device_register(&hwif->gendev);
 651         if (ret < 0) {
 652                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
 653                         __func__, ret);
 654                 goto out;
 655         }
 656
 657         hwif->portdev = device_create_drvdata(ide_port_class, &hwif->gendev,
 658                                               MKDEV(0, 0), hwif, hwif->name);
 659         if (IS_ERR(hwif->portdev)) {
 660                 ret = PTR_ERR(hwif->portdev);
 661                 device_unregister(&hwif->gendev);
 662         }
 663 out:
 664         return ret;
 665 }
 666
 667 /**
 668  *      ide_port_wait_ready     -       wait for port to become ready
 669  *      @hwif: IDE port
 670  *
 671  *      This is needed on some PPCs and a bunch of BIOS-less embedded
 672  *      platforms.  Typical cases are:
 673  *
 674  *      - The firmware hard reset the disk before booting the kernel,
 675  *        the drive is still doing it's poweron-reset sequence, that
 676  *        can take up to 30 seconds.
 677  *
 678  *      - The firmware does nothing (or no firmware), the device is
 679  *        still in POST state (same as above actually).
 680  *
 681  *      - Some CD/DVD/Writer combo drives tend to drive the bus during
 682  *        their reset sequence even when they are non-selected slave
 683  *        devices, thus preventing discovery of the main HD.
 684  *
 685  *      Doing this wait-for-non-busy should not harm any existing
 686  *      configuration and fix some issues like the above.
 687  *
 688  *      BenH.
 689  *
 690  *      Returns 0 on success, error code (< 0) otherwise.
 691  */
 692
 693 static int ide_port_wait_ready(ide_hwif_t *hwif)
 694 {
 695         int unit, rc;
 696
 697         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 698
 699         /* Let HW settle down a bit from whatever init state we
 700          * come from */
 701         mdelay(2);
 702
 703         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 704          * I know of at least one disk who takes 31 seconds, I use 35
 705          * here to be safe
 706          */
 707         rc = ide_wait_not_busy(hwif, 35000);
 708         if (rc)
 709                 return rc;
 710
 711         /* Now make sure both master & slave are ready */
 712         for (unit = 0; unit < MAX_DRIVES; unit++) {
 713                 ide_drive_t *drive = &hwif->drives[unit];
 714
 715                 /* Ignore disks that we will not probe for later. */
 716                 if (!drive->noprobe || drive->present) {
 717                         SELECT_DRIVE(drive);
 718                         hwif->set_irq(hwif, 1);
 719                         mdelay(2);
 720                         rc = ide_wait_not_busy(hwif, 35000);
 721                         if (rc)
 722                                 goto out;
 723                 } else
 724                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
 725                                           drive->name);
 726         }
 727 out:
 728         /* Exit function with master reselected (let's be sane) */
 729         if (unit)
 730                 SELECT_DRIVE(&hwif->drives[0]);
 731
 732         return rc;
 733 }
 734
 735 /**
 736  *      ide_undecoded_slave     -       look for bad CF adapters
 737  *      @drive1: drive
 738  *
 739  *      Analyse the drives on the interface and attempt to decide if we
 740  *      have the same drive viewed twice. This occurs with crap CF adapters
 741  *      and PCMCIA sometimes.
 742  */
 743
 744 void ide_undecoded_slave(ide_drive_t *drive1)
 745 {
 746         ide_drive_t *drive0 = &drive1->hwif->drives[0];
 747
 748         if ((drive1->dn & 1) == 0 || drive0->present == 0)
 749                 return;
 750
 751         /* If the models don't match they are not the same product */
 752         if (strcmp(drive0->id->model, drive1->id->model))
 753                 return;
 754
 755         /* Serial numbers do not match */
 756         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
 757                 return;
 758
 759         /* No serial number, thankfully very rare for CF */
 760         if (drive0->id->serial_no[0] == 0)
 761                 return;
 762
 763         /* Appears to be an IDE flash adapter with decode bugs */
 764         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 765
 766         drive1->present = 0;
 767 }
 768
 769 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 770
 771 static int ide_probe_port(ide_hwif_t *hwif)
 772 {
 773         unsigned long flags;
 774         unsigned int irqd;
 775         int unit, rc = -ENODEV;
 776
 777         BUG_ON(hwif->present);
 778
 779         if (hwif->drives[0].noprobe && hwif->drives[1].noprobe)
 780                 return -EACCES;
 781
 782         /*
 783          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 784          * we'll install our IRQ driver much later...
 785          */
 786         irqd = hwif->irq;
 787         if (irqd)
 788                 disable_irq(hwif->irq);
 789
 790         local_irq_set(flags);
 791
 792         if (ide_port_wait_ready(hwif) == -EBUSY)
 793                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 794
 795         /*
 796          * Second drive should only exist if first drive was found,
 797          * but a lot of cdrom drives are configured as single slaves.
 798          */
 799         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 800                 ide_drive_t *drive = &hwif->drives[unit];
 801                 drive->dn = (hwif->channel ? 2 : 0) + unit;
 802                 (void) probe_for_drive(drive);
 803                 if (drive->present)
 804                         rc = 0;
 805         }
 806
 807         local_irq_restore(flags);
 808
 809         /*
 810          * Use cached IRQ number. It might be (and is...) changed by probe
 811          * code above
 812          */
 813         if (irqd)
 814                 enable_irq(irqd);
 815
 816         return rc;
 817 }
 818
 819 static void ide_port_tune_devices(ide_hwif_t *hwif)
 820 {
 821         const struct ide_port_ops *port_ops = hwif->port_ops;
 822         int unit;
 823
 824         for (unit = 0; unit < MAX_DRIVES; unit++) {
 825                 ide_drive_t *drive = &hwif->drives[unit];
 826
 827                 if (drive->present && port_ops && port_ops->quirkproc)
 828                         port_ops->quirkproc(drive);
 829         }
 830
 831         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 832                 ide_drive_t *drive = &hwif->drives[unit];
 833
 834                 if (drive->present) {
 835                         ide_set_max_pio(drive);
 836
 837                         drive->nice1 = 1;
 838
 839                         if (hwif->dma_ops)
 840                                 ide_set_dma(drive);
 841                 }
 842         }
 843
 844         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 845                 ide_drive_t *drive = &hwif->drives[unit];
 846
 847                 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
 848                         drive->no_io_32bit = 1;
 849                 else
 850                         drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
 851         }
 852 }
 853
 854 #if MAX_HWIFS > 1
 855 /*
 856  * save_match() is used to simplify logic in init_irq() below.
 857  *
 858  * A loophole here is that we may not know about a particular
 859  * hwif's irq until after that hwif is actually probed/initialized..
 860  * This could be a problem for the case where an hwif is on a
 861  * dual interface that requires serialization (eg. cmd640) and another
 862  * hwif using one of the same irqs is initialized beforehand.
 863  *
 864  * This routine detects and reports such situations, but does not fix them.
 865  */
 866 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 867 {
 868         ide_hwif_t *m = *match;
 869
 870         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 871                 if (!new->hwgroup)
 872                         return;
 873                 printk("%s: potential irq problem with %s and %s\n",
 874                         hwif->name, new->name, m->name);
 875         }
 876         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 877                 *match = new;
 878 }
 879 #endif /* MAX_HWIFS > 1 */
 880
 881 /*
 882  * init request queue
 883  */
 884 static int ide_init_queue(ide_drive_t *drive)
 885 {
 886         struct request_queue *q;
 887         ide_hwif_t *hwif = HWIF(drive);
 888         int max_sectors = 256;
 889         int max_sg_entries = PRD_ENTRIES;
 890
 891         /*
 892          *      Our default set up assumes the normal IDE case,
 893          *      that is 64K segmenting, standard PRD setup
 894          *      and LBA28. Some drivers then impose their own
 895          *      limits and LBA48 we could raise it but as yet
 896          *      do not.
 897          */
 898
 899         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
 900         if (!q)
 901                 return 1;
 902
 903         q->queuedata = drive;
 904         blk_queue_segment_boundary(q, 0xffff);
 905
 906         if (hwif->rqsize < max_sectors)
 907                 max_sectors = hwif->rqsize;
 908         blk_queue_max_sectors(q, max_sectors);
 909
 910 #ifdef CONFIG_PCI
 911         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 912          * creates segments that don't completely match our boundary
 913          * requirements and thus need to be broken up again. Because it
 914          * doesn't align properly either, we may actually have to break up
 915          * to more segments than what was we got in the first place, a max
 916          * worst case is twice as many.
 917          * This will be fixed once we teach pci_map_sg() about our boundary
 918          * requirements, hopefully soon. *FIXME*
 919          */
 920         if (!PCI_DMA_BUS_IS_PHYS)
 921                 max_sg_entries >>= 1;
 922 #endif /* CONFIG_PCI */
 923
 924         blk_queue_max_hw_segments(q, max_sg_entries);
 925         blk_queue_max_phys_segments(q, max_sg_entries);
 926
 927         /* assign drive queue */
 928         drive->queue = q;
 929
 930         /* needs drive->queue to be set */
 931         ide_toggle_bounce(drive, 1);
 932
 933         return 0;
 934 }
 935
 936 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
 937 {
 938         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
 939
 940         spin_lock_irq(&ide_lock);
 941         if (!hwgroup->drive) {
 942                 /* first drive for hwgroup. */
 943                 drive->next = drive;
 944                 hwgroup->drive = drive;
 945                 hwgroup->hwif = HWIF(hwgroup->drive);
 946         } else {
 947                 drive->next = hwgroup->drive->next;
 948                 hwgroup->drive->next = drive;
 949         }
 950         spin_unlock_irq(&ide_lock);
 951 }
 952
 953 /*
 954  * For any present drive:
 955  * - allocate the block device queue
 956  * - link drive into the hwgroup
 957  */
 958 static void ide_port_setup_devices(ide_hwif_t *hwif)
 959 {
 960         int i;
 961
 962         mutex_lock(&ide_cfg_mtx);
 963         for (i = 0; i < MAX_DRIVES; i++) {
 964                 ide_drive_t *drive = &hwif->drives[i];
 965
 966                 if (!drive->present)
 967                         continue;
 968
 969                 if (ide_init_queue(drive)) {
 970                         printk(KERN_ERR "ide: failed to init %s\n",
 971                                         drive->name);
 972                         continue;
 973                 }
 974
 975                 ide_add_drive_to_hwgroup(drive);
 976         }
 977         mutex_unlock(&ide_cfg_mtx);
 978 }
 979
 980 /*
 981  * This routine sets up the irq for an ide interface, and creates a new
 982  * hwgroup for the irq/hwif if none was previously assigned.
 983  *
 984  * Much of the code is for correctly detecting/handling irq sharing
 985  * and irq serialization situations.  This is somewhat complex because
 986  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
 987  */
 988 static int init_irq (ide_hwif_t *hwif)
 989 {
 990         struct ide_io_ports *io_ports = &hwif->io_ports;
 991         unsigned int index;
 992         ide_hwgroup_t *hwgroup;
 993         ide_hwif_t *match = NULL;
 994
 995
 996         BUG_ON(in_interrupt());
 997         BUG_ON(irqs_disabled());
 998         BUG_ON(hwif == NULL);
 999
1000         mutex_lock(&ide_cfg_mtx);
1001         hwif->hwgroup = NULL;
1002 #if MAX_HWIFS > 1
1003         /*
1004          * Group up with any other hwifs that share our irq(s).
1005          */
1006         for (index = 0; index < MAX_HWIFS; index++) {
1007                 ide_hwif_t *h = &ide_hwifs[index];
1008                 if (h->hwgroup) {  /* scan only initialized hwif's */
1009                         if (hwif->irq == h->irq) {
1010                                 hwif->sharing_irq = h->sharing_irq = 1;
1011                                 if (hwif->chipset != ide_pci ||
1012                                     h->chipset != ide_pci) {
1013                                         save_match(hwif, h, &match);
1014                                 }
1015                         }
1016                         if (hwif->serialized) {
1017                                 if (hwif->mate && hwif->mate->irq == h->irq)
1018                                         save_match(hwif, h, &match);
1019                         }
1020                         if (h->serialized) {
1021                                 if (h->mate && hwif->irq == h->mate->irq)
1022                                         save_match(hwif, h, &match);
1023                         }
1024                 }
1025         }
1026 #endif /* MAX_HWIFS > 1 */
1027         /*
1028          * If we are still without a hwgroup, then form a new one
1029          */
1030         if (match) {
1031                 hwgroup = match->hwgroup;
1032                 hwif->hwgroup = hwgroup;
1033                 /*
1034                  * Link us into the hwgroup.
1035                  * This must be done early, do ensure that unexpected_intr
1036                  * can find the hwif and prevent irq storms.
1037                  * No drives are attached to the new hwif, choose_drive
1038                  * can't do anything stupid (yet).
1039                  * Add ourself as the 2nd entry to the hwgroup->hwif
1040                  * linked list, the first entry is the hwif that owns
1041                  * hwgroup->handler - do not change that.
1042                  */
1043                 spin_lock_irq(&ide_lock);
1044                 hwif->next = hwgroup->hwif->next;
1045                 hwgroup->hwif->next = hwif;
1046                 BUG_ON(hwif->next == hwif);
1047                 spin_unlock_irq(&ide_lock);
1048         } else {
1049                 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1050                                        hwif_to_node(hwif));
1051                 if (hwgroup == NULL)
1052                         goto out_up;
1053
1054                 hwif->hwgroup = hwgroup;
1055                 hwgroup->hwif = hwif->next = hwif;
1056
1057                 init_timer(&hwgroup->timer);
1058                 hwgroup->timer.function = &ide_timer_expiry;
1059                 hwgroup->timer.data = (unsigned long) hwgroup;
1060         }
1061
1062         /*
1063          * Allocate the irq, if not already obtained for another hwif
1064          */
1065         if (!match || match->irq != hwif->irq) {
1066                 int sa = 0;
1067 #if defined(__mc68000__)
1068                 sa = IRQF_SHARED;
1069 #endif /* __mc68000__ */
1070
1071                 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1072                         sa = IRQF_SHARED;
1073
1074                 if (io_ports->ctl_addr)
1075                         hwif->set_irq(hwif, 1);
1076
1077                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1078                         goto out_unlink;
1079         }
1080
1081         if (!hwif->rqsize) {
1082                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1083                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1084                         hwif->rqsize = 256;
1085                 else
1086                         hwif->rqsize = 65536;
1087         }
1088
1089 #if !defined(__mc68000__)
1090         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1091                 io_ports->data_addr, io_ports->status_addr,
1092                 io_ports->ctl_addr, hwif->irq);
1093 #else
1094         printk("%s at 0x%08lx on irq %d", hwif->name,
1095                 io_ports->data_addr, hwif->irq);
1096 #endif /* __mc68000__ */
1097         if (match)
1098                 printk(" (%sed with %s)",
1099                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1100         printk("\n");
1101
1102         mutex_unlock(&ide_cfg_mtx);
1103         return 0;
1104 out_unlink:
1105         ide_remove_port_from_hwgroup(hwif);
1106 out_up:
1107         mutex_unlock(&ide_cfg_mtx);
1108         return 1;
1109 }
1110
1111 static int ata_lock(dev_t dev, void *data)
1112 {
1113         /* FIXME: we want to pin hwif down */
1114         return 0;
1115 }
1116
1117 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1118 {
1119         ide_hwif_t *hwif = data;
1120         int unit = *part >> PARTN_BITS;
1121         ide_drive_t *drive = &hwif->drives[unit];
1122         if (!drive->present)
1123                 return NULL;
1124
1125         if (drive->media == ide_disk)
1126                 request_module("ide-disk");
1127         if (drive->scsi)
1128                 request_module("ide-scsi");
1129         if (drive->media == ide_cdrom || drive->media == ide_optical)
1130                 request_module("ide-cd");
1131         if (drive->media == ide_tape)
1132                 request_module("ide-tape");
1133         if (drive->media == ide_floppy)
1134                 request_module("ide-floppy");
1135
1136         return NULL;
1137 }
1138
1139 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1140 {
1141         struct gendisk *p = data;
1142         *part &= (1 << PARTN_BITS) - 1;
1143         return &p->dev.kobj;
1144 }
1145
1146 static int exact_lock(dev_t dev, void *data)
1147 {
1148         struct gendisk *p = data;
1149
1150         if (!get_disk(p))
1151                 return -1;
1152         return 0;
1153 }
1154
1155 void ide_register_region(struct gendisk *disk)
1156 {
1157         blk_register_region(MKDEV(disk->major, disk->first_minor),
1158                             disk->minors, NULL, exact_match, exact_lock, disk);
1159 }
1160
1161 EXPORT_SYMBOL_GPL(ide_register_region);
1162
1163 void ide_unregister_region(struct gendisk *disk)
1164 {
1165         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1166                               disk->minors);
1167 }
1168
1169 EXPORT_SYMBOL_GPL(ide_unregister_region);
1170
1171 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1172 {
1173         ide_hwif_t *hwif = drive->hwif;
1174         unsigned int unit = (drive->select.all >> 4) & 1;
1175
1176         disk->major = hwif->major;
1177         disk->first_minor = unit << PARTN_BITS;
1178         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1179         disk->queue = drive->queue;
1180 }
1181
1182 EXPORT_SYMBOL_GPL(ide_init_disk);
1183
1184 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1185 {
1186         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1187
1188         if (drive == drive->next) {
1189                 /* special case: last drive from hwgroup. */
1190                 BUG_ON(hwgroup->drive != drive);
1191                 hwgroup->drive = NULL;
1192         } else {
1193                 ide_drive_t *walk;
1194
1195                 walk = hwgroup->drive;
1196                 while (walk->next != drive)
1197                         walk = walk->next;
1198                 walk->next = drive->next;
1199                 if (hwgroup->drive == drive) {
1200                         hwgroup->drive = drive->next;
1201                         hwgroup->hwif = hwgroup->drive->hwif;
1202                 }
1203         }
1204         BUG_ON(hwgroup->drive == drive);
1205 }
1206
1207 static void drive_release_dev (struct device *dev)
1208 {
1209         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1210
1211         ide_proc_unregister_device(drive);
1212
1213         spin_lock_irq(&ide_lock);
1214         ide_remove_drive_from_hwgroup(drive);
1215         kfree(drive->id);
1216         drive->id = NULL;
1217         drive->present = 0;
1218         /* Messed up locking ... */
1219         spin_unlock_irq(&ide_lock);
1220         blk_cleanup_queue(drive->queue);
1221         spin_lock_irq(&ide_lock);
1222         drive->queue = NULL;
1223         spin_unlock_irq(&ide_lock);
1224
1225         complete(&drive->gendev_rel_comp);
1226 }
1227
1228 static int hwif_init(ide_hwif_t *hwif)
1229 {
1230         int old_irq;
1231
1232         if (!hwif->irq) {
1233                 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1234                 if (!hwif->irq) {
1235                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1236                         return 0;
1237                 }
1238         }
1239
1240         if (register_blkdev(hwif->major, hwif->name))
1241                 return 0;
1242
1243         if (!hwif->sg_max_nents)
1244                 hwif->sg_max_nents = PRD_ENTRIES;
1245
1246         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1247                                  GFP_KERNEL);
1248         if (!hwif->sg_table) {
1249                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1250                 goto out;
1251         }
1252
1253         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1254
1255         if (init_irq(hwif) == 0)
1256                 goto done;
1257
1258         old_irq = hwif->irq;
1259         /*
1260          *      It failed to initialise. Find the default IRQ for
1261          *      this port and try that.
1262          */
1263         hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1264         if (!hwif->irq) {
1265                 printk("%s: Disabled unable to get IRQ %d.\n",
1266                         hwif->name, old_irq);
1267                 goto out;
1268         }
1269         if (init_irq(hwif)) {
1270                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1271                         hwif->name, old_irq, hwif->irq);
1272                 goto out;
1273         }
1274         printk("%s: probed IRQ %d failed, using default.\n",
1275                 hwif->name, hwif->irq);
1276
1277 done:
1278         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1279                             THIS_MODULE, ata_probe, ata_lock, hwif);
1280         return 1;
1281
1282 out:
1283         unregister_blkdev(hwif->major, hwif->name);
1284         return 0;
1285 }
1286
1287 static void hwif_register_devices(ide_hwif_t *hwif)
1288 {
1289         unsigned int i;
1290
1291         for (i = 0; i < MAX_DRIVES; i++) {
1292                 ide_drive_t *drive = &hwif->drives[i];
1293                 struct device *dev = &drive->gendev;
1294                 int ret;
1295
1296                 if (!drive->present)
1297                         continue;
1298
1299                 ide_add_generic_settings(drive);
1300
1301                 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1302                 dev->parent = &hwif->gendev;
1303                 dev->bus = &ide_bus_type;
1304                 dev->driver_data = drive;
1305                 dev->release = drive_release_dev;
1306
1307                 ret = device_register(dev);
1308                 if (ret < 0)
1309                         printk(KERN_WARNING "IDE: %s: device_register error: "
1310                                             "%d\n", __func__, ret);
1311         }
1312 }
1313
1314 static void ide_port_init_devices(ide_hwif_t *hwif)
1315 {
1316         const struct ide_port_ops *port_ops = hwif->port_ops;
1317         int i;
1318
1319         for (i = 0; i < MAX_DRIVES; i++) {
1320                 ide_drive_t *drive = &hwif->drives[i];
1321
1322                 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1323                         drive->io_32bit = 1;
1324                 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1325                         drive->unmask = 1;
1326                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1327                         drive->no_unmask = 1;
1328
1329                 if (port_ops && port_ops->init_dev)
1330                         port_ops->init_dev(drive);
1331         }
1332 }
1333
1334 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1335                           const struct ide_port_info *d)
1336 {
1337         hwif->channel = port;
1338
1339         if (d->chipset)
1340                 hwif->chipset = d->chipset;
1341
1342         if (d->init_iops)
1343                 d->init_iops(hwif);
1344
1345         if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1346             (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1347                 hwif->irq = port ? 15 : 14;
1348
1349         /* ->host_flags may be set by ->init_iops (or even earlier...) */
1350         hwif->host_flags |= d->host_flags;
1351         hwif->pio_mask = d->pio_mask;
1352
1353         /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1354         if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1355                 hwif->port_ops = d->port_ops;
1356
1357         hwif->swdma_mask = d->swdma_mask;
1358         hwif->mwdma_mask = d->mwdma_mask;
1359         hwif->ultra_mask = d->udma_mask;
1360
1361         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1362                 int rc;
1363
1364                 if (d->init_dma)
1365                         rc = d->init_dma(hwif, d);
1366                 else
1367                         rc = ide_hwif_setup_dma(hwif, d);
1368
1369                 if (rc < 0) {
1370                         printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1371                         hwif->dma_base = 0;
1372                         hwif->swdma_mask = 0;
1373                         hwif->mwdma_mask = 0;
1374                         hwif->ultra_mask = 0;
1375                 } else if (d->dma_ops)
1376                         hwif->dma_ops = d->dma_ops;
1377         }
1378
1379         if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1380             ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1381                 if (hwif->mate)
1382                         hwif->mate->serialized = hwif->serialized = 1;
1383         }
1384
1385         if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1386                 hwif->rqsize = 256;
1387
1388         /* call chipset specific routine for each enabled port */
1389         if (d->init_hwif)
1390                 d->init_hwif(hwif);
1391 }
1392
1393 static void ide_port_cable_detect(ide_hwif_t *hwif)
1394 {
1395         const struct ide_port_ops *port_ops = hwif->port_ops;
1396
1397         if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1398                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1399                         hwif->cbl = port_ops->cable_detect(hwif);
1400         }
1401 }
1402
1403 static ssize_t store_delete_devices(struct device *portdev,
1404                                     struct device_attribute *attr,
1405                                     const char *buf, size_t n)
1406 {
1407         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1408
1409         if (strncmp(buf, "1", n))
1410                 return -EINVAL;
1411
1412         ide_port_unregister_devices(hwif);
1413
1414         return n;
1415 };
1416
1417 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1418
1419 static ssize_t store_scan(struct device *portdev,
1420                           struct device_attribute *attr,
1421                           const char *buf, size_t n)
1422 {
1423         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1424
1425         if (strncmp(buf, "1", n))
1426                 return -EINVAL;
1427
1428         ide_port_unregister_devices(hwif);
1429         ide_port_scan(hwif);
1430
1431         return n;
1432 };
1433
1434 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1435
1436 static struct device_attribute *ide_port_attrs[] = {
1437         &dev_attr_delete_devices,
1438         &dev_attr_scan,
1439         NULL
1440 };
1441
1442 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1443 {
1444         int i, rc;
1445
1446         for (i = 0; ide_port_attrs[i]; i++) {
1447                 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1448                 if (rc)
1449                         break;
1450         }
1451
1452         return rc;
1453 }
1454
1455 /**
1456  *      ide_find_port_slot      -       find free ide_hwifs[] slot
1457  *      @d: IDE port info
1458  *
1459  *      Return the new hwif.  If we are out of free slots return NULL.
1460  */
1461
1462 ide_hwif_t *ide_find_port_slot(const struct ide_port_info *d)
1463 {
1464         ide_hwif_t *hwif;
1465         int i;
1466         u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1467
1468         /*
1469          * Claim an unassigned slot.
1470          *
1471          * Give preference to claiming other slots before claiming ide0/ide1,
1472          * just in case there's another interface yet-to-be-scanned
1473          * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1474          *
1475          * Unless there is a bootable card that does not use the standard
1476          * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1477          */
1478         if (bootable) {
1479                 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;
1480
1481                 for (; i < MAX_HWIFS; i++) {
1482                         hwif = &ide_hwifs[i];
1483                         if (hwif->chipset == ide_unknown)
1484                                 goto out_found;
1485                 }
1486         } else {
1487                 for (i = 2; i < MAX_HWIFS; i++) {
1488                         hwif = &ide_hwifs[i];
1489                         if (hwif->chipset == ide_unknown)
1490                                 goto out_found;
1491                 }
1492                 for (i = 0; i < 2 && i < MAX_HWIFS; i++) {
1493                         hwif = &ide_hwifs[i];
1494                         if (hwif->chipset == ide_unknown)
1495                                 goto out_found;
1496                 }
1497         }
1498
1499         printk(KERN_ERR "%s: no free slot for interface\n",
1500                         d ? d->name : "ide");
1501
1502         return NULL;
1503
1504 out_found:
1505         ide_init_port_data(hwif, i);
1506         return hwif;
1507 }
1508 EXPORT_SYMBOL_GPL(ide_find_port_slot);
1509
1510 int ide_device_add_all(u8 *idx, const struct ide_port_info *d, hw_regs_t **hws)
1511 {
1512         ide_hwif_t *hwif, *mate = NULL;
1513         int i, rc = 0;
1514
1515         for (i = 0; i < MAX_HWIFS; i++) {
1516                 if (idx[i] == 0xff) {
1517                         mate = NULL;
1518                         continue;
1519                 }
1520
1521                 hwif = &ide_hwifs[idx[i]];
1522
1523                 ide_init_port_hw(hwif, hws[i]);
1524                 ide_port_apply_params(hwif);
1525
1526                 if (d == NULL) {
1527                         mate = NULL;
1528                         continue;
1529                 }
1530
1531                 if ((i & 1) && mate) {
1532                         hwif->mate = mate;
1533                         mate->mate = hwif;
1534                 }
1535
1536                 mate = (i & 1) ? NULL : hwif;
1537
1538                 ide_init_port(hwif, i & 1, d);
1539                 ide_port_cable_detect(hwif);
1540                 ide_port_init_devices(hwif);
1541         }
1542
1543         for (i = 0; i < MAX_HWIFS; i++) {
1544                 if (idx[i] == 0xff)
1545                         continue;
1546
1547                 hwif = &ide_hwifs[idx[i]];
1548
1549                 if (ide_probe_port(hwif) == 0)
1550                         hwif->present = 1;
1551
1552                 if (hwif->chipset != ide_4drives || !hwif->mate ||
1553                     !hwif->mate->present)
1554                         ide_register_port(hwif);
1555
1556                 if (hwif->present)
1557                         ide_port_tune_devices(hwif);
1558         }
1559
1560         for (i = 0; i < MAX_HWIFS; i++) {
1561                 if (idx[i] == 0xff)
1562                         continue;
1563
1564                 hwif = &ide_hwifs[idx[i]];
1565
1566                 if (hwif_init(hwif) == 0) {
1567                         printk(KERN_INFO "%s: failed to initialize IDE "
1568                                          "interface\n", hwif->name);
1569                         hwif->present = 0;
1570                         rc = -1;
1571                         continue;
1572                 }
1573
1574                 if (hwif->present)
1575                         ide_port_setup_devices(hwif);
1576
1577                 ide_acpi_init(hwif);
1578
1579                 if (hwif->present)
1580                         ide_acpi_port_init_devices(hwif);
1581         }
1582
1583         for (i = 0; i < MAX_HWIFS; i++) {
1584                 if (idx[i] == 0xff)
1585                         continue;
1586
1587                 hwif = &ide_hwifs[idx[i]];
1588
1589                 if (hwif->chipset == ide_unknown)
1590                         hwif->chipset = ide_generic;
1591
1592                 if (hwif->present)
1593                         hwif_register_devices(hwif);
1594         }
1595
1596         for (i = 0; i < MAX_HWIFS; i++) {
1597                 if (idx[i] == 0xff)
1598                         continue;
1599
1600                 hwif = &ide_hwifs[idx[i]];
1601
1602                 ide_sysfs_register_port(hwif);
1603                 ide_proc_register_port(hwif);
1604
1605                 if (hwif->present)
1606                         ide_proc_port_register_devices(hwif);
1607         }
1608
1609         return rc;
1610 }
1611 EXPORT_SYMBOL_GPL(ide_device_add_all);
1612
1613 int ide_device_add(u8 *idx, const struct ide_port_info *d, hw_regs_t **hws)
1614 {
1615         hw_regs_t *hws_all[MAX_HWIFS];
1616         u8 idx_all[MAX_HWIFS];
1617         int i;
1618
1619         for (i = 0; i < MAX_HWIFS; i++) {
1620                 hws_all[i] = (i < 4) ? hws[i] : NULL;
1621                 idx_all[i] = (i < 4) ? idx[i] : 0xff;
1622         }
1623
1624         return ide_device_add_all(idx_all, d, hws_all);
1625 }
1626 EXPORT_SYMBOL_GPL(ide_device_add);
1627
1628 void ide_port_scan(ide_hwif_t *hwif)
1629 {
1630         ide_port_apply_params(hwif);
1631         ide_port_cable_detect(hwif);
1632         ide_port_init_devices(hwif);
1633
1634         if (ide_probe_port(hwif) < 0)
1635                 return;
1636
1637         hwif->present = 1;
1638
1639         ide_port_tune_devices(hwif);
1640         ide_acpi_port_init_devices(hwif);
1641         ide_port_setup_devices(hwif);
1642         hwif_register_devices(hwif);
1643         ide_proc_port_register_devices(hwif);
1644 }
1645 EXPORT_SYMBOL_GPL(ide_port_scan);
1646
1647 static void ide_legacy_init_one(u8 *idx, hw_regs_t **hws, hw_regs_t *hw,
1648                                 u8 port_no, const struct ide_port_info *d,
1649                                 unsigned long config)
1650 {
1651         ide_hwif_t *hwif;
1652         unsigned long base, ctl;
1653         int irq;
1654
1655         if (port_no == 0) {
1656                 base = 0x1f0;
1657                 ctl  = 0x3f6;
1658                 irq  = 14;
1659         } else {
1660                 base = 0x170;
1661                 ctl  = 0x376;
1662                 irq  = 15;
1663         }
1664
1665         if (!request_region(base, 8, d->name)) {
1666                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1667                                 d->name, base, base + 7);
1668                 return;
1669         }
1670
1671         if (!request_region(ctl, 1, d->name)) {
1672                 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1673                                 d->name, ctl);
1674                 release_region(base, 8);
1675                 return;
1676         }
1677
1678         ide_std_init_ports(hw, base, ctl);
1679         hw->irq = irq;
1680         hw->chipset = d->chipset;
1681
1682         hwif = ide_find_port_slot(d);
1683         if (hwif) {
1684                 hwif->chipset = hw->chipset;
1685
1686                 if (config)
1687                         hwif->config_data = config;
1688
1689                 hws[port_no] = hw;
1690                 idx[port_no] = hwif->index;
1691         }
1692 }
1693
1694 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
1695 {
1696         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
1697         hw_regs_t hw[2], *hws[] = { NULL, NULL, NULL, NULL };
1698
1699         memset(&hw, 0, sizeof(hw));
1700
1701         if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
1702                 ide_legacy_init_one(idx, hws, &hw[0], 0, d, config);
1703         ide_legacy_init_one(idx, hws, &hw[1], 1, d, config);
1704
1705         if (idx[0] == 0xff && idx[1] == 0xff &&
1706             (d->host_flags & IDE_HFLAG_SINGLE))
1707                 return -ENOENT;
1708
1709         ide_device_add(idx, d, hws);
1710
1711         return 0;
1712 }
1713 EXPORT_SYMBOL_GPL(ide_legacy_device_add);