drivers/ide/ide.c

   1 /*
   2  *  Copyright (C) 1994-1998         Linus Torvalds & authors (see below)
   3  *  Copyrifht (C) 2003-2005, 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 multiple IDE interface driver, as evolved from hd.c.
  14  * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
  15  *   (usually 14 & 15).
  16  * There can be up to two drives per interface, as per the ATA-2 spec.
  17  *
  18  * ...
  19  *
  20  *  From hd.c:
  21  *  |
  22  *  | It traverses the request-list, using interrupts to jump between functions.
  23  *  | As nearly all functions can be called within interrupts, we may not sleep.
  24  *  | Special care is recommended.  Have Fun!
  25  *  |
  26  *  | modified by Drew Eckhardt to check nr of hd's from the CMOS.
  27  *  |
  28  *  | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
  29  *  | in the early extended-partition checks and added DM partitions.
  30  *  |
  31  *  | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
  32  *  |
  33  *  | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
  34  *  | and general streamlining by Mark Lord (mlord@pobox.com).
  35  *
  36  *  October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
  37  *
  38  *      Mark Lord       (mlord@pobox.com)               (IDE Perf.Pkg)
  39  *      Delman Lee      (delman@ieee.org)               ("Mr. atdisk2")
  40  *      Scott Snyder    (snyder@fnald0.fnal.gov)        (ATAPI IDE cd-rom)
  41  *
  42  *  This was a rewrite of just about everything from hd.c, though some original
  43  *  code is still sprinkled about.  Think of it as a major evolution, with
  44  *  inspiration from lots of linux users, esp.  hamish@zot.apana.org.au
  45  */
  46
  47 #define _IDE_C                  /* Tell ide.h it's really us */
  48
  49 #include <linux/module.h>
  50 #include <linux/types.h>
  51 #include <linux/string.h>
  52 #include <linux/kernel.h>
  53 #include <linux/timer.h>
  54 #include <linux/mm.h>
  55 #include <linux/interrupt.h>
  56 #include <linux/major.h>
  57 #include <linux/errno.h>
  58 #include <linux/genhd.h>
  59 #include <linux/blkpg.h>
  60 #include <linux/slab.h>
  61 #include <linux/init.h>
  62 #include <linux/pci.h>
  63 #include <linux/delay.h>
  64 #include <linux/ide.h>
  65 #include <linux/completion.h>
  66 #include <linux/reboot.h>
  67 #include <linux/cdrom.h>
  68 #include <linux/seq_file.h>
  69 #include <linux/device.h>
  70 #include <linux/bitops.h>
  71
  72 #include <asm/byteorder.h>
  73 #include <asm/irq.h>
  74 #include <asm/uaccess.h>
  75 #include <asm/io.h>
  76
  77
  78 /* default maximum number of failures */
  79 #define IDE_DEFAULT_MAX_FAILURES        1
  80
  81 struct class *ide_port_class;
  82
  83 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
  84                                         IDE2_MAJOR, IDE3_MAJOR,
  85                                         IDE4_MAJOR, IDE5_MAJOR,
  86                                         IDE6_MAJOR, IDE7_MAJOR,
  87                                         IDE8_MAJOR, IDE9_MAJOR };
  88
  89 static int idebus_parameter;    /* holds the "idebus=" parameter */
  90 static int system_bus_speed;    /* holds what we think is VESA/PCI bus speed */
  91
  92 DEFINE_MUTEX(ide_cfg_mtx);
  93  __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
  94
  95 int noautodma = 0;
  96
  97 #ifdef CONFIG_BLK_DEV_IDEACPI
  98 int ide_noacpi = 0;
  99 int ide_noacpitfs = 1;
 100 int ide_noacpionboot = 1;
 101 #endif
 102
 103 /*
 104  * This is declared extern in ide.h, for access by other IDE modules:
 105  */
 106 ide_hwif_t ide_hwifs[MAX_HWIFS];        /* master data repository */
 107
 108 EXPORT_SYMBOL(ide_hwifs);
 109
 110 static void ide_port_init_devices_data(ide_hwif_t *);
 111
 112 /*
 113  * Do not even *think* about calling this!
 114  */
 115 void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
 116 {
 117         /* bulk initialize hwif & drive info with zeros */
 118         memset(hwif, 0, sizeof(ide_hwif_t));
 119
 120         /* fill in any non-zero initial values */
 121         hwif->index     = index;
 122         hwif->major     = ide_hwif_to_major[index];
 123
 124         hwif->name[0]   = 'i';
 125         hwif->name[1]   = 'd';
 126         hwif->name[2]   = 'e';
 127         hwif->name[3]   = '0' + index;
 128
 129         hwif->bus_state = BUSSTATE_ON;
 130
 131         init_completion(&hwif->gendev_rel_comp);
 132
 133         default_hwif_iops(hwif);
 134         default_hwif_transport(hwif);
 135
 136         ide_port_init_devices_data(hwif);
 137 }
 138 EXPORT_SYMBOL_GPL(ide_init_port_data);
 139
 140 static void ide_port_init_devices_data(ide_hwif_t *hwif)
 141 {
 142         int unit;
 143
 144         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 145                 ide_drive_t *drive = &hwif->drives[unit];
 146                 u8 j = (hwif->index * MAX_DRIVES) + unit;
 147
 148                 memset(drive, 0, sizeof(*drive));
 149
 150                 drive->media                    = ide_disk;
 151                 drive->select.all               = (unit<<4)|0xa0;
 152                 drive->hwif                     = hwif;
 153                 drive->ctl                      = 0x08;
 154                 drive->ready_stat               = READY_STAT;
 155                 drive->bad_wstat                = BAD_W_STAT;
 156                 drive->special.b.recalibrate    = 1;
 157                 drive->special.b.set_geometry   = 1;
 158                 drive->name[0]                  = 'h';
 159                 drive->name[1]                  = 'd';
 160                 drive->name[2]                  = 'a' + j;
 161                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
 162
 163                 INIT_LIST_HEAD(&drive->list);
 164                 init_completion(&drive->gendev_rel_comp);
 165         }
 166 }
 167
 168 /*
 169  * init_ide_data() sets reasonable default values into all fields
 170  * of all instances of the hwifs and drives, but only on the first call.
 171  * Subsequent calls have no effect (they don't wipe out anything).
 172  *
 173  * This routine is normally called at driver initialization time,
 174  * but may also be called MUCH earlier during kernel "command-line"
 175  * parameter processing.  As such, we cannot depend on any other parts
 176  * of the kernel (such as memory allocation) to be functioning yet.
 177  *
 178  * This is too bad, as otherwise we could dynamically allocate the
 179  * ide_drive_t structs as needed, rather than always consuming memory
 180  * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
 181  *
 182  * FIXME: We should stuff the setup data into __init and copy the
 183  * relevant hwifs/allocate them properly during boot.
 184  */
 185 #define MAGIC_COOKIE 0x12345678
 186 static void __init init_ide_data (void)
 187 {
 188         unsigned int index;
 189         static unsigned long magic_cookie = MAGIC_COOKIE;
 190
 191         if (magic_cookie != MAGIC_COOKIE)
 192                 return;         /* already initialized */
 193         magic_cookie = 0;
 194
 195         /* Initialise all interface structures */
 196         for (index = 0; index < MAX_HWIFS; ++index) {
 197                 ide_hwif_t *hwif = &ide_hwifs[index];
 198
 199                 ide_init_port_data(hwif, index);
 200         }
 201 }
 202
 203 /**
 204  *      ide_system_bus_speed    -       guess bus speed
 205  *
 206  *      ide_system_bus_speed() returns what we think is the system VESA/PCI
 207  *      bus speed (in MHz). This is used for calculating interface PIO timings.
 208  *      The default is 40 for known PCI systems, 50 otherwise.
 209  *      The "idebus=xx" parameter can be used to override this value.
 210  *      The actual value to be used is computed/displayed the first time
 211  *      through. Drivers should only use this as a last resort.
 212  *
 213  *      Returns a guessed speed in MHz.
 214  */
 215
 216 static int ide_system_bus_speed(void)
 217 {
 218 #ifdef CONFIG_PCI
 219         static struct pci_device_id pci_default[] = {
 220                 { PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID) },
 221                 { }
 222         };
 223 #else
 224 #define pci_default 0
 225 #endif /* CONFIG_PCI */
 226
 227         /* user supplied value */
 228         if (idebus_parameter)
 229                 return idebus_parameter;
 230
 231         /* safe default value for PCI or VESA and PCI*/
 232         return pci_dev_present(pci_default) ? 33 : 50;
 233 }
 234
 235 ide_hwif_t * ide_find_port(unsigned long base)
 236 {
 237         ide_hwif_t *hwif;
 238         int i;
 239
 240         for (i = 0; i < MAX_HWIFS; i++) {
 241                 hwif = &ide_hwifs[i];
 242                 if (hwif->io_ports[IDE_DATA_OFFSET] == base)
 243                         goto found;
 244         }
 245
 246         for (i = 0; i < MAX_HWIFS; i++) {
 247                 hwif = &ide_hwifs[i];
 248                 if (hwif->chipset == ide_unknown)
 249                         goto found;
 250         }
 251
 252         hwif = NULL;
 253 found:
 254         return hwif;
 255 }
 256
 257 EXPORT_SYMBOL_GPL(ide_find_port);
 258
 259 static struct resource* hwif_request_region(ide_hwif_t *hwif,
 260                                             unsigned long addr, int num)
 261 {
 262         struct resource *res = request_region(addr, num, hwif->name);
 263
 264         if (!res)
 265                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
 266                                 hwif->name, addr, addr+num-1);
 267         return res;
 268 }
 269
 270 /**
 271  *      ide_hwif_request_regions - request resources for IDE
 272  *      @hwif: interface to use
 273  *
 274  *      Requests all the needed resources for an interface.
 275  *      Right now core IDE code does this work which is deeply wrong.
 276  *      MMIO leaves it to the controller driver,
 277  *      PIO will migrate this way over time.
 278  */
 279
 280 int ide_hwif_request_regions(ide_hwif_t *hwif)
 281 {
 282         unsigned long addr;
 283         unsigned int i;
 284
 285         if (hwif->mmio)
 286                 return 0;
 287         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 288         if (addr && !hwif_request_region(hwif, addr, 1))
 289                 goto control_region_busy;
 290         hwif->straight8 = 0;
 291         addr = hwif->io_ports[IDE_DATA_OFFSET];
 292         if ((addr | 7) == hwif->io_ports[IDE_STATUS_OFFSET]) {
 293                 if (!hwif_request_region(hwif, addr, 8))
 294                         goto data_region_busy;
 295                 hwif->straight8 = 1;
 296                 return 0;
 297         }
 298         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
 299                 addr = hwif->io_ports[i];
 300                 if (!hwif_request_region(hwif, addr, 1)) {
 301                         while (--i)
 302                                 release_region(addr, 1);
 303                         goto data_region_busy;
 304                 }
 305         }
 306         return 0;
 307
 308 data_region_busy:
 309         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 310         if (addr)
 311                 release_region(addr, 1);
 312 control_region_busy:
 313         /* If any errors are return, we drop the hwif interface. */
 314         return -EBUSY;
 315 }
 316
 317 /**
 318  *      ide_hwif_release_regions - free IDE resources
 319  *
 320  *      Note that we only release the standard ports,
 321  *      and do not even try to handle any extra ports
 322  *      allocated for weird IDE interface chipsets.
 323  *
 324  *      Note also that we don't yet handle mmio resources here. More
 325  *      importantly our caller should be doing this so we need to
 326  *      restructure this as a helper function for drivers.
 327  */
 328
 329 void ide_hwif_release_regions(ide_hwif_t *hwif)
 330 {
 331         u32 i = 0;
 332
 333         if (hwif->mmio)
 334                 return;
 335         if (hwif->io_ports[IDE_CONTROL_OFFSET])
 336                 release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
 337         if (hwif->straight8) {
 338                 release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
 339                 return;
 340         }
 341         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
 342                 if (hwif->io_ports[i])
 343                         release_region(hwif->io_ports[i], 1);
 344 }
 345
 346 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
 347 {
 348         ide_hwgroup_t *hwgroup = hwif->hwgroup;
 349
 350         spin_lock_irq(&ide_lock);
 351         /*
 352          * Remove us from the hwgroup, and free
 353          * the hwgroup if we were the only member
 354          */
 355         if (hwif->next == hwif) {
 356                 BUG_ON(hwgroup->hwif != hwif);
 357                 kfree(hwgroup);
 358         } else {
 359                 /* There is another interface in hwgroup.
 360                  * Unlink us, and set hwgroup->drive and ->hwif to
 361                  * something sane.
 362                  */
 363                 ide_hwif_t *g = hwgroup->hwif;
 364
 365                 while (g->next != hwif)
 366                         g = g->next;
 367                 g->next = hwif->next;
 368                 if (hwgroup->hwif == hwif) {
 369                         /* Chose a random hwif for hwgroup->hwif.
 370                          * It's guaranteed that there are no drives
 371                          * left in the hwgroup.
 372                          */
 373                         BUG_ON(hwgroup->drive != NULL);
 374                         hwgroup->hwif = g;
 375                 }
 376                 BUG_ON(hwgroup->hwif == hwif);
 377         }
 378         spin_unlock_irq(&ide_lock);
 379 }
 380
 381 /* Called with ide_lock held. */
 382 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
 383 {
 384         int i;
 385
 386         for (i = 0; i < MAX_DRIVES; i++) {
 387                 ide_drive_t *drive = &hwif->drives[i];
 388
 389                 if (drive->present) {
 390                         spin_unlock_irq(&ide_lock);
 391                         device_unregister(&drive->gendev);
 392                         wait_for_completion(&drive->gendev_rel_comp);
 393                         spin_lock_irq(&ide_lock);
 394                 }
 395         }
 396 }
 397
 398 void ide_port_unregister_devices(ide_hwif_t *hwif)
 399 {
 400         mutex_lock(&ide_cfg_mtx);
 401         spin_lock_irq(&ide_lock);
 402         __ide_port_unregister_devices(hwif);
 403         hwif->present = 0;
 404         ide_port_init_devices_data(hwif);
 405         spin_unlock_irq(&ide_lock);
 406         mutex_unlock(&ide_cfg_mtx);
 407 }
 408 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
 409
 410 /**
 411  *      ide_unregister          -       free an IDE interface
 412  *      @index: index of interface (will change soon to a pointer)
 413  *
 414  *      Perform the final unregister of an IDE interface. At the moment
 415  *      we don't refcount interfaces so this will also get split up.
 416  *
 417  *      Locking:
 418  *      The caller must not hold the IDE locks
 419  *      The drive present/vanishing is not yet properly locked
 420  *      Take care with the callbacks. These have been split to avoid
 421  *      deadlocking the IDE layer. The shutdown callback is called
 422  *      before we take the lock and free resources. It is up to the
 423  *      caller to be sure there is no pending I/O here, and that
 424  *      the interface will not be reopened (present/vanishing locking
 425  *      isn't yet done BTW). After we commit to the final kill we
 426  *      call the cleanup callback with the ide locks held.
 427  *
 428  *      Unregister restores the hwif structures to the default state.
 429  *      This is raving bonkers.
 430  */
 431
 432 void ide_unregister(unsigned int index)
 433 {
 434         ide_hwif_t *hwif, *g;
 435         ide_hwgroup_t *hwgroup;
 436         int irq_count = 0;
 437
 438         BUG_ON(index >= MAX_HWIFS);
 439
 440         BUG_ON(in_interrupt());
 441         BUG_ON(irqs_disabled());
 442         mutex_lock(&ide_cfg_mtx);
 443         spin_lock_irq(&ide_lock);
 444         hwif = &ide_hwifs[index];
 445         if (!hwif->present)
 446                 goto abort;
 447         __ide_port_unregister_devices(hwif);
 448         hwif->present = 0;
 449
 450         spin_unlock_irq(&ide_lock);
 451
 452         ide_proc_unregister_port(hwif);
 453
 454         hwgroup = hwif->hwgroup;
 455         /*
 456          * free the irq if we were the only hwif using it
 457          */
 458         g = hwgroup->hwif;
 459         do {
 460                 if (g->irq == hwif->irq)
 461                         ++irq_count;
 462                 g = g->next;
 463         } while (g != hwgroup->hwif);
 464         if (irq_count == 1)
 465                 free_irq(hwif->irq, hwgroup);
 466
 467         ide_remove_port_from_hwgroup(hwif);
 468
 469         device_unregister(hwif->portdev);
 470         device_unregister(&hwif->gendev);
 471         wait_for_completion(&hwif->gendev_rel_comp);
 472
 473         /*
 474          * Remove us from the kernel's knowledge
 475          */
 476         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 477         kfree(hwif->sg_table);
 478         unregister_blkdev(hwif->major, hwif->name);
 479         spin_lock_irq(&ide_lock);
 480
 481         if (hwif->dma_base)
 482                 (void)ide_release_dma(hwif);
 483
 484         ide_hwif_release_regions(hwif);
 485
 486         /* restore hwif data to pristine status */
 487         ide_init_port_data(hwif, index);
 488
 489 abort:
 490         spin_unlock_irq(&ide_lock);
 491         mutex_unlock(&ide_cfg_mtx);
 492 }
 493
 494 EXPORT_SYMBOL(ide_unregister);
 495
 496 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
 497 {
 498         memcpy(hwif->io_ports, hw->io_ports, sizeof(hwif->io_ports));
 499         hwif->irq = hw->irq;
 500         hwif->noprobe = 0;
 501         hwif->chipset = hw->chipset;
 502         hwif->gendev.parent = hw->dev;
 503         hwif->ack_intr = hw->ack_intr;
 504 }
 505 EXPORT_SYMBOL_GPL(ide_init_port_hw);
 506
 507 /*
 508  *      Locks for IDE setting functionality
 509  */
 510
 511 DEFINE_MUTEX(ide_setting_mtx);
 512
 513 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 514
 515 /**
 516  *      ide_spin_wait_hwgroup   -       wait for group
 517  *      @drive: drive in the group
 518  *
 519  *      Wait for an IDE device group to go non busy and then return
 520  *      holding the ide_lock which guards the hwgroup->busy status
 521  *      and right to use it.
 522  */
 523
 524 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 525 {
 526         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 527         unsigned long timeout = jiffies + (3 * HZ);
 528
 529         spin_lock_irq(&ide_lock);
 530
 531         while (hwgroup->busy) {
 532                 unsigned long lflags;
 533                 spin_unlock_irq(&ide_lock);
 534                 local_irq_set(lflags);
 535                 if (time_after(jiffies, timeout)) {
 536                         local_irq_restore(lflags);
 537                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 538                         return -EBUSY;
 539                 }
 540                 local_irq_restore(lflags);
 541                 spin_lock_irq(&ide_lock);
 542         }
 543         return 0;
 544 }
 545
 546 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 547
 548 int set_io_32bit(ide_drive_t *drive, int arg)
 549 {
 550         if (drive->no_io_32bit)
 551                 return -EPERM;
 552
 553         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 554                 return -EINVAL;
 555
 556         if (ide_spin_wait_hwgroup(drive))
 557                 return -EBUSY;
 558
 559         drive->io_32bit = arg;
 560
 561         spin_unlock_irq(&ide_lock);
 562
 563         return 0;
 564 }
 565
 566 static int set_ksettings(ide_drive_t *drive, int arg)
 567 {
 568         if (arg < 0 || arg > 1)
 569                 return -EINVAL;
 570
 571         if (ide_spin_wait_hwgroup(drive))
 572                 return -EBUSY;
 573         drive->keep_settings = arg;
 574         spin_unlock_irq(&ide_lock);
 575
 576         return 0;
 577 }
 578
 579 int set_using_dma(ide_drive_t *drive, int arg)
 580 {
 581 #ifdef CONFIG_BLK_DEV_IDEDMA
 582         ide_hwif_t *hwif = drive->hwif;
 583         int err = -EPERM;
 584
 585         if (arg < 0 || arg > 1)
 586                 return -EINVAL;
 587
 588         if (!drive->id || !(drive->id->capability & 1))
 589                 goto out;
 590
 591         if (hwif->dma_host_set == NULL)
 592                 goto out;
 593
 594         err = -EBUSY;
 595         if (ide_spin_wait_hwgroup(drive))
 596                 goto out;
 597         /*
 598          * set ->busy flag, unlock and let it ride
 599          */
 600         hwif->hwgroup->busy = 1;
 601         spin_unlock_irq(&ide_lock);
 602
 603         err = 0;
 604
 605         if (arg) {
 606                 if (ide_set_dma(drive))
 607                         err = -EIO;
 608         } else
 609                 ide_dma_off(drive);
 610
 611         /*
 612          * lock, clear ->busy flag and unlock before leaving
 613          */
 614         spin_lock_irq(&ide_lock);
 615         hwif->hwgroup->busy = 0;
 616         spin_unlock_irq(&ide_lock);
 617 out:
 618         return err;
 619 #else
 620         if (arg < 0 || arg > 1)
 621                 return -EINVAL;
 622
 623         return -EPERM;
 624 #endif
 625 }
 626
 627 int set_pio_mode(ide_drive_t *drive, int arg)
 628 {
 629         struct request rq;
 630
 631         if (arg < 0 || arg > 255)
 632                 return -EINVAL;
 633
 634         if (drive->hwif->set_pio_mode == NULL)
 635                 return -ENOSYS;
 636
 637         if (drive->special.b.set_tune)
 638                 return -EBUSY;
 639
 640         ide_init_drive_cmd(&rq);
 641         rq.cmd_type = REQ_TYPE_ATA_TASKFILE;
 642
 643         drive->tune_req = (u8) arg;
 644         drive->special.b.set_tune = 1;
 645         (void) ide_do_drive_cmd(drive, &rq, ide_wait);
 646         return 0;
 647 }
 648
 649 static int set_unmaskirq(ide_drive_t *drive, int arg)
 650 {
 651         if (drive->no_unmask)
 652                 return -EPERM;
 653
 654         if (arg < 0 || arg > 1)
 655                 return -EINVAL;
 656
 657         if (ide_spin_wait_hwgroup(drive))
 658                 return -EBUSY;
 659         drive->unmask = arg;
 660         spin_unlock_irq(&ide_lock);
 661
 662         return 0;
 663 }
 664
 665 /**
 666  *      system_bus_clock        -       clock guess
 667  *
 668  *      External version of the bus clock guess used by very old IDE drivers
 669  *      for things like VLB timings. Should not be used.
 670  */
 671
 672 int system_bus_clock (void)
 673 {
 674         return system_bus_speed;
 675 }
 676
 677 EXPORT_SYMBOL(system_bus_clock);
 678
 679 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 680 {
 681         ide_drive_t *drive = dev->driver_data;
 682         ide_hwif_t *hwif = HWIF(drive);
 683         struct request rq;
 684         struct request_pm_state rqpm;
 685         ide_task_t args;
 686         int ret;
 687
 688         /* Call ACPI _GTM only once */
 689         if (!(drive->dn % 2))
 690                 ide_acpi_get_timing(hwif);
 691
 692         memset(&rq, 0, sizeof(rq));
 693         memset(&rqpm, 0, sizeof(rqpm));
 694         memset(&args, 0, sizeof(args));
 695         rq.cmd_type = REQ_TYPE_PM_SUSPEND;
 696         rq.special = &args;
 697         rq.data = &rqpm;
 698         rqpm.pm_step = ide_pm_state_start_suspend;
 699         if (mesg.event == PM_EVENT_PRETHAW)
 700                 mesg.event = PM_EVENT_FREEZE;
 701         rqpm.pm_state = mesg.event;
 702
 703         ret = ide_do_drive_cmd(drive, &rq, ide_wait);
 704         /* only call ACPI _PS3 after both drivers are suspended */
 705         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 706                  && hwif->drives[1].present)
 707                  || !hwif->drives[0].present
 708                  || !hwif->drives[1].present))
 709                 ide_acpi_set_state(hwif, 0);
 710         return ret;
 711 }
 712
 713 static int generic_ide_resume(struct device *dev)
 714 {
 715         ide_drive_t *drive = dev->driver_data;
 716         ide_hwif_t *hwif = HWIF(drive);
 717         struct request rq;
 718         struct request_pm_state rqpm;
 719         ide_task_t args;
 720         int err;
 721
 722         /* Call ACPI _STM only once */
 723         if (!(drive->dn % 2)) {
 724                 ide_acpi_set_state(hwif, 1);
 725                 ide_acpi_push_timing(hwif);
 726         }
 727
 728         ide_acpi_exec_tfs(drive);
 729
 730         memset(&rq, 0, sizeof(rq));
 731         memset(&rqpm, 0, sizeof(rqpm));
 732         memset(&args, 0, sizeof(args));
 733         rq.cmd_type = REQ_TYPE_PM_RESUME;
 734         rq.special = &args;
 735         rq.data = &rqpm;
 736         rqpm.pm_step = ide_pm_state_start_resume;
 737         rqpm.pm_state = PM_EVENT_ON;
 738
 739         err = ide_do_drive_cmd(drive, &rq, ide_head_wait);
 740
 741         if (err == 0 && dev->driver) {
 742                 ide_driver_t *drv = to_ide_driver(dev->driver);
 743
 744                 if (drv->resume)
 745                         drv->resume(drive);
 746         }
 747
 748         return err;
 749 }
 750
 751 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 752                         unsigned int cmd, unsigned long arg)
 753 {
 754         unsigned long flags;
 755         ide_driver_t *drv;
 756         void __user *p = (void __user *)arg;
 757         int err = 0, (*setfunc)(ide_drive_t *, int);
 758         u8 *val;
 759
 760         switch (cmd) {
 761         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
 762         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
 763         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
 764         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
 765         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
 766         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
 767         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
 768         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
 769         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
 770         }
 771
 772         switch (cmd) {
 773                 case HDIO_OBSOLETE_IDENTITY:
 774                 case HDIO_GET_IDENTITY:
 775                         if (bdev != bdev->bd_contains)
 776                                 return -EINVAL;
 777                         if (drive->id_read == 0)
 778                                 return -ENOMSG;
 779                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
 780                                 return -EFAULT;
 781                         return 0;
 782
 783                 case HDIO_GET_NICE:
 784                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
 785                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
 786                                         drive->nice1 << IDE_NICE_1,
 787                                         (long __user *) arg);
 788 #ifdef CONFIG_IDE_TASK_IOCTL
 789                 case HDIO_DRIVE_TASKFILE:
 790                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 791                                 return -EACCES;
 792                         switch(drive->media) {
 793                                 case ide_disk:
 794                                         return ide_taskfile_ioctl(drive, cmd, arg);
 795                                 default:
 796                                         return -ENOMSG;
 797                         }
 798 #endif /* CONFIG_IDE_TASK_IOCTL */
 799
 800                 case HDIO_DRIVE_CMD:
 801                         if (!capable(CAP_SYS_RAWIO))
 802                                 return -EACCES;
 803                         return ide_cmd_ioctl(drive, cmd, arg);
 804
 805                 case HDIO_DRIVE_TASK:
 806                         if (!capable(CAP_SYS_RAWIO))
 807                                 return -EACCES;
 808                         return ide_task_ioctl(drive, cmd, arg);
 809                 case HDIO_SET_NICE:
 810                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
 811                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
 812                                 return -EPERM;
 813                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
 814                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
 815                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
 816                                 drive->dsc_overlap = 0;
 817                                 return -EPERM;
 818                         }
 819                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
 820                         return 0;
 821                 case HDIO_DRIVE_RESET:
 822                         if (!capable(CAP_SYS_ADMIN))
 823                                 return -EACCES;
 824
 825                         /*
 826                          *      Abort the current command on the
 827                          *      group if there is one, taking
 828                          *      care not to allow anything else
 829                          *      to be queued and to die on the
 830                          *      spot if we miss one somehow
 831                          */
 832
 833                         spin_lock_irqsave(&ide_lock, flags);
 834
 835                         if (HWGROUP(drive)->resetting) {
 836                                 spin_unlock_irqrestore(&ide_lock, flags);
 837                                 return -EBUSY;
 838                         }
 839
 840                         ide_abort(drive, "drive reset");
 841
 842                         BUG_ON(HWGROUP(drive)->handler);
 843
 844                         /* Ensure nothing gets queued after we
 845                            drop the lock. Reset will clear the busy */
 846
 847                         HWGROUP(drive)->busy = 1;
 848                         spin_unlock_irqrestore(&ide_lock, flags);
 849                         (void) ide_do_reset(drive);
 850
 851                         return 0;
 852                 case HDIO_GET_BUSSTATE:
 853                         if (!capable(CAP_SYS_ADMIN))
 854                                 return -EACCES;
 855                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
 856                                 return -EFAULT;
 857                         return 0;
 858
 859                 case HDIO_SET_BUSSTATE:
 860                         if (!capable(CAP_SYS_ADMIN))
 861                                 return -EACCES;
 862                         return -EOPNOTSUPP;
 863                 default:
 864                         return -EINVAL;
 865         }
 866
 867 read_val:
 868         mutex_lock(&ide_setting_mtx);
 869         spin_lock_irqsave(&ide_lock, flags);
 870         err = *val;
 871         spin_unlock_irqrestore(&ide_lock, flags);
 872         mutex_unlock(&ide_setting_mtx);
 873         return err >= 0 ? put_user(err, (long __user *)arg) : err;
 874
 875 set_val:
 876         if (bdev != bdev->bd_contains)
 877                 err = -EINVAL;
 878         else {
 879                 if (!capable(CAP_SYS_ADMIN))
 880                         err = -EACCES;
 881                 else {
 882                         mutex_lock(&ide_setting_mtx);
 883                         err = setfunc(drive, arg);
 884                         mutex_unlock(&ide_setting_mtx);
 885                 }
 886         }
 887         return err;
 888 }
 889
 890 EXPORT_SYMBOL(generic_ide_ioctl);
 891
 892 /*
 893  * stridx() returns the offset of c within s,
 894  * or -1 if c is '\0' or not found within s.
 895  */
 896 static int __init stridx (const char *s, char c)
 897 {
 898         char *i = strchr(s, c);
 899         return (i && c) ? i - s : -1;
 900 }
 901
 902 /*
 903  * match_parm() does parsing for ide_setup():
 904  *
 905  * 1. the first char of s must be '='.
 906  * 2. if the remainder matches one of the supplied keywords,
 907  *     the index (1 based) of the keyword is negated and returned.
 908  * 3. if the remainder is a series of no more than max_vals numbers
 909  *     separated by commas, the numbers are saved in vals[] and a
 910  *     count of how many were saved is returned.  Base10 is assumed,
 911  *     and base16 is allowed when prefixed with "0x".
 912  * 4. otherwise, zero is returned.
 913  */
 914 static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
 915 {
 916         static const char *decimal = "0123456789";
 917         static const char *hex = "0123456789abcdef";
 918         int i, n;
 919
 920         if (*s++ == '=') {
 921                 /*
 922                  * Try matching against the supplied keywords,
 923                  * and return -(index+1) if we match one
 924                  */
 925                 if (keywords != NULL) {
 926                         for (i = 0; *keywords != NULL; ++i) {
 927                                 if (!strcmp(s, *keywords++))
 928                                         return -(i+1);
 929                         }
 930                 }
 931                 /*
 932                  * Look for a series of no more than "max_vals"
 933                  * numeric values separated by commas, in base10,
 934                  * or base16 when prefixed with "0x".
 935                  * Return a count of how many were found.
 936                  */
 937                 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
 938                         vals[n] = i;
 939                         while ((i = stridx(decimal, *++s)) >= 0)
 940                                 vals[n] = (vals[n] * 10) + i;
 941                         if (*s == 'x' && !vals[n]) {
 942                                 while ((i = stridx(hex, *++s)) >= 0)
 943                                         vals[n] = (vals[n] * 0x10) + i;
 944                         }
 945                         if (++n == max_vals)
 946                                 break;
 947                         if (*s == ',' || *s == ';')
 948                                 ++s;
 949                 }
 950                 if (!*s)
 951                         return n;
 952         }
 953         return 0;       /* zero = nothing matched */
 954 }
 955
 956 extern int probe_ali14xx;
 957 extern int probe_umc8672;
 958 extern int probe_dtc2278;
 959 extern int probe_ht6560b;
 960 extern int probe_qd65xx;
 961 extern int cmd640_vlb;
 962 extern int probe_4drives;
 963
 964 static int __initdata is_chipset_set;
 965
 966 /*
 967  * ide_setup() gets called VERY EARLY during initialization,
 968  * to handle kernel "command line" strings beginning with "hdx=" or "ide".
 969  *
 970  * Remember to update Documentation/ide/ide.txt if you change something here.
 971  */
 972 static int __init ide_setup(char *s)
 973 {
 974         int i, vals[3];
 975         ide_hwif_t *hwif;
 976         ide_drive_t *drive;
 977         unsigned int hw, unit;
 978         const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
 979         const char max_hwif  = '0' + (MAX_HWIFS - 1);
 980
 981
 982         if (strncmp(s,"hd",2) == 0 && s[2] == '=')      /* hd= is for hd.c   */
 983                 return 0;                               /* driver and not us */
 984
 985         if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
 986                 return 0;
 987
 988         printk(KERN_INFO "ide_setup: %s", s);
 989         init_ide_data ();
 990
 991 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
 992         if (!strcmp(s, "ide=doubler")) {
 993                 extern int ide_doubler;
 994
 995                 printk(" : Enabled support for IDE doublers\n");
 996                 ide_doubler = 1;
 997                 return 1;
 998         }
 999 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
1000
1001         if (!strcmp(s, "ide=nodma")) {
1002                 printk(" : Prevented DMA\n");
1003                 noautodma = 1;
1004                 goto obsolete_option;
1005         }
1006
1007 #ifdef CONFIG_BLK_DEV_IDEACPI
1008         if (!strcmp(s, "ide=noacpi")) {
1009                 //printk(" : Disable IDE ACPI support.\n");
1010                 ide_noacpi = 1;
1011                 return 1;
1012         }
1013         if (!strcmp(s, "ide=acpigtf")) {
1014                 //printk(" : Enable IDE ACPI _GTF support.\n");
1015                 ide_noacpitfs = 0;
1016                 return 1;
1017         }
1018         if (!strcmp(s, "ide=acpionboot")) {
1019                 //printk(" : Call IDE ACPI methods on boot.\n");
1020                 ide_noacpionboot = 0;
1021                 return 1;
1022         }
1023 #endif /* CONFIG_BLK_DEV_IDEACPI */
1024
1025         /*
1026          * Look for drive options:  "hdx="
1027          */
1028         if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
1029                 const char *hd_words[] = {
1030                         "none", "noprobe", "nowerr", "cdrom", "nodma",
1031                         "autotune", "noautotune", "-8", "-9", "-10",
1032                         "noflush", "remap", "remap63", "scsi", NULL };
1033                 unit = s[2] - 'a';
1034                 hw   = unit / MAX_DRIVES;
1035                 unit = unit % MAX_DRIVES;
1036                 hwif = &ide_hwifs[hw];
1037                 drive = &hwif->drives[unit];
1038                 if (strncmp(s + 4, "ide-", 4) == 0) {
1039                         strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
1040                         goto obsolete_option;
1041                 }
1042                 switch (match_parm(&s[3], hd_words, vals, 3)) {
1043                         case -1: /* "none" */
1044                         case -2: /* "noprobe" */
1045                                 drive->noprobe = 1;
1046                                 goto done;
1047                         case -3: /* "nowerr" */
1048                                 drive->bad_wstat = BAD_R_STAT;
1049                                 hwif->noprobe = 0;
1050                                 goto done;
1051                         case -4: /* "cdrom" */
1052                                 drive->present = 1;
1053                                 drive->media = ide_cdrom;
1054                                 /* an ATAPI device ignores DRDY */
1055                                 drive->ready_stat = 0;
1056                                 hwif->noprobe = 0;
1057                                 goto done;
1058                         case -5: /* nodma */
1059                                 drive->nodma = 1;
1060                                 goto done;
1061                         case -6: /* "autotune" */
1062                                 drive->autotune = IDE_TUNE_AUTO;
1063                                 goto obsolete_option;
1064                         case -7: /* "noautotune" */
1065                                 drive->autotune = IDE_TUNE_NOAUTO;
1066                                 goto obsolete_option;
1067                         case -11: /* noflush */
1068                                 drive->noflush = 1;
1069                                 goto done;
1070                         case -12: /* "remap" */
1071                                 drive->remap_0_to_1 = 1;
1072                                 goto obsolete_option;
1073                         case -13: /* "remap63" */
1074                                 drive->sect0 = 63;
1075                                 goto obsolete_option;
1076                         case -14: /* "scsi" */
1077                                 drive->scsi = 1;
1078                                 goto obsolete_option;
1079                         case 3: /* cyl,head,sect */
1080                                 drive->media    = ide_disk;
1081                                 drive->ready_stat = READY_STAT;
1082                                 drive->cyl      = drive->bios_cyl  = vals[0];
1083                                 drive->head     = drive->bios_head = vals[1];
1084                                 drive->sect     = drive->bios_sect = vals[2];
1085                                 drive->present  = 1;
1086                                 drive->forced_geom = 1;
1087                                 hwif->noprobe = 0;
1088                                 goto done;
1089                         default:
1090                                 goto bad_option;
1091                 }
1092         }
1093
1094         if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
1095                 goto bad_option;
1096         /*
1097          * Look for bus speed option:  "idebus="
1098          */
1099         if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
1100                 if (match_parm(&s[6], NULL, vals, 1) != 1)
1101                         goto bad_option;
1102                 if (vals[0] >= 20 && vals[0] <= 66) {
1103                         idebus_parameter = vals[0];
1104                 } else
1105                         printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
1106                 goto done;
1107         }
1108         /*
1109          * Look for interface options:  "idex="
1110          */
1111         if (s[3] >= '0' && s[3] <= max_hwif) {
1112                 /*
1113                  * Be VERY CAREFUL changing this: note hardcoded indexes below
1114                  * (-8, -9, -10) are reserved to ease the hardcoding.
1115                  */
1116                 static const char *ide_words[] = {
1117                         "minus1", "serialize", "minus3", "minus4",
1118                         "reset", "minus6", "ata66", "minus8", "minus9",
1119                         "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
1120                         "dtc2278", "umc8672", "ali14xx", NULL };
1121
1122                 hw = s[3] - '0';
1123                 hwif = &ide_hwifs[hw];
1124                 i = match_parm(&s[4], ide_words, vals, 3);
1125
1126                 /*
1127                  * Cryptic check to ensure chipset not already set for hwif.
1128                  * Note: we can't depend on hwif->chipset here.
1129                  */
1130                 if (i >= -18 && i <= -11) {
1131                         /* chipset already specified */
1132                         if (is_chipset_set)
1133                                 goto bad_option;
1134                         /* these drivers are for "ide0=" only */
1135                         if (hw != 0)
1136                                 goto bad_hwif;
1137                         is_chipset_set = 1;
1138                         printk("\n");
1139                 }
1140
1141                 switch (i) {
1142 #ifdef CONFIG_BLK_DEV_ALI14XX
1143                         case -17: /* "ali14xx" */
1144                                 probe_ali14xx = 1;
1145                                 goto obsolete_option;
1146 #endif
1147 #ifdef CONFIG_BLK_DEV_UMC8672
1148                         case -16: /* "umc8672" */
1149                                 probe_umc8672 = 1;
1150                                 goto obsolete_option;
1151 #endif
1152 #ifdef CONFIG_BLK_DEV_DTC2278
1153                         case -15: /* "dtc2278" */
1154                                 probe_dtc2278 = 1;
1155                                 goto obsolete_option;
1156 #endif
1157 #ifdef CONFIG_BLK_DEV_CMD640
1158                         case -14: /* "cmd640_vlb" */
1159                                 cmd640_vlb = 1;
1160                                 goto obsolete_option;
1161 #endif
1162 #ifdef CONFIG_BLK_DEV_HT6560B
1163                         case -13: /* "ht6560b" */
1164                                 probe_ht6560b = 1;
1165                                 goto obsolete_option;
1166 #endif
1167 #ifdef CONFIG_BLK_DEV_QD65XX
1168                         case -12: /* "qd65xx" */
1169                                 probe_qd65xx = 1;
1170                                 goto obsolete_option;
1171 #endif
1172 #ifdef CONFIG_BLK_DEV_4DRIVES
1173                         case -11: /* "four" drives on one set of ports */
1174                                 probe_4drives = 1;
1175                                 goto obsolete_option;
1176 #endif
1177                         case -10: /* minus10 */
1178                         case -9: /* minus9 */
1179                         case -8: /* minus8 */
1180                         case -6:
1181                         case -4:
1182                         case -3:
1183                                 goto bad_option;
1184                         case -7: /* ata66 */
1185 #ifdef CONFIG_BLK_DEV_IDEPCI
1186                                 /*
1187                                  * Use ATA_CBL_PATA40_SHORT so drive side
1188                                  * cable detection is also overriden.
1189                                  */
1190                                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1191                                 goto obsolete_option;
1192 #else
1193                                 goto bad_hwif;
1194 #endif
1195                         case -5: /* "reset" */
1196                                 hwif->reset = 1;
1197                                 goto obsolete_option;
1198                         case -2: /* "serialize" */
1199                                 hwif->mate = &ide_hwifs[hw^1];
1200                                 hwif->mate->mate = hwif;
1201                                 hwif->serialized = hwif->mate->serialized = 1;
1202                                 goto obsolete_option;
1203
1204                         case -1:
1205                         case 0:
1206                         case 1:
1207                         case 2:
1208                         case 3:
1209                                 goto bad_option;
1210                         default:
1211                                 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
1212                                 return 1;
1213                 }
1214         }
1215 bad_option:
1216         printk(" -- BAD OPTION\n");
1217         return 1;
1218 obsolete_option:
1219         printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
1220         return 1;
1221 bad_hwif:
1222         printk("-- NOT SUPPORTED ON ide%d", hw);
1223 done:
1224         printk("\n");
1225         return 1;
1226 }
1227
1228 EXPORT_SYMBOL(ide_lock);
1229
1230 static int ide_bus_match(struct device *dev, struct device_driver *drv)
1231 {
1232         return 1;
1233 }
1234
1235 static char *media_string(ide_drive_t *drive)
1236 {
1237         switch (drive->media) {
1238         case ide_disk:
1239                 return "disk";
1240         case ide_cdrom:
1241                 return "cdrom";
1242         case ide_tape:
1243                 return "tape";
1244         case ide_floppy:
1245                 return "floppy";
1246         case ide_optical:
1247                 return "optical";
1248         default:
1249                 return "UNKNOWN";
1250         }
1251 }
1252
1253 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
1254 {
1255         ide_drive_t *drive = to_ide_device(dev);
1256         return sprintf(buf, "%s\n", media_string(drive));
1257 }
1258
1259 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
1260 {
1261         ide_drive_t *drive = to_ide_device(dev);
1262         return sprintf(buf, "%s\n", drive->name);
1263 }
1264
1265 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1266 {
1267         ide_drive_t *drive = to_ide_device(dev);
1268         return sprintf(buf, "ide:m-%s\n", media_string(drive));
1269 }
1270
1271 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
1272                           char *buf)
1273 {
1274         ide_drive_t *drive = to_ide_device(dev);
1275         return sprintf(buf, "%s\n", drive->id->model);
1276 }
1277
1278 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
1279                              char *buf)
1280 {
1281         ide_drive_t *drive = to_ide_device(dev);
1282         return sprintf(buf, "%s\n", drive->id->fw_rev);
1283 }
1284
1285 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
1286                            char *buf)
1287 {
1288         ide_drive_t *drive = to_ide_device(dev);
1289         return sprintf(buf, "%s\n", drive->id->serial_no);
1290 }
1291
1292 static struct device_attribute ide_dev_attrs[] = {
1293         __ATTR_RO(media),
1294         __ATTR_RO(drivename),
1295         __ATTR_RO(modalias),
1296         __ATTR_RO(model),
1297         __ATTR_RO(firmware),
1298         __ATTR(serial, 0400, serial_show, NULL),
1299         __ATTR_NULL
1300 };
1301
1302 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
1303 {
1304         ide_drive_t *drive = to_ide_device(dev);
1305
1306         add_uevent_var(env, "MEDIA=%s", media_string(drive));
1307         add_uevent_var(env, "DRIVENAME=%s", drive->name);
1308         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
1309         return 0;
1310 }
1311
1312 static int generic_ide_probe(struct device *dev)
1313 {
1314         ide_drive_t *drive = to_ide_device(dev);
1315         ide_driver_t *drv = to_ide_driver(dev->driver);
1316
1317         return drv->probe ? drv->probe(drive) : -ENODEV;
1318 }
1319
1320 static int generic_ide_remove(struct device *dev)
1321 {
1322         ide_drive_t *drive = to_ide_device(dev);
1323         ide_driver_t *drv = to_ide_driver(dev->driver);
1324
1325         if (drv->remove)
1326                 drv->remove(drive);
1327
1328         return 0;
1329 }
1330
1331 static void generic_ide_shutdown(struct device *dev)
1332 {
1333         ide_drive_t *drive = to_ide_device(dev);
1334         ide_driver_t *drv = to_ide_driver(dev->driver);
1335
1336         if (dev->driver && drv->shutdown)
1337                 drv->shutdown(drive);
1338 }
1339
1340 struct bus_type ide_bus_type = {
1341         .name           = "ide",
1342         .match          = ide_bus_match,
1343         .uevent         = ide_uevent,
1344         .probe          = generic_ide_probe,
1345         .remove         = generic_ide_remove,
1346         .shutdown       = generic_ide_shutdown,
1347         .dev_attrs      = ide_dev_attrs,
1348         .suspend        = generic_ide_suspend,
1349         .resume         = generic_ide_resume,
1350 };
1351
1352 EXPORT_SYMBOL_GPL(ide_bus_type);
1353
1354 static void ide_port_class_release(struct device *portdev)
1355 {
1356         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1357
1358         put_device(&hwif->gendev);
1359 }
1360
1361 /*
1362  * This is gets invoked once during initialization, to set *everything* up
1363  */
1364 static int __init ide_init(void)
1365 {
1366         int ret;
1367
1368         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
1369         system_bus_speed = ide_system_bus_speed();
1370
1371         printk(KERN_INFO "ide: Assuming %dMHz system bus speed "
1372                          "for PIO modes%s\n", system_bus_speed,
1373                         idebus_parameter ? "" : "; override with idebus=xx");
1374
1375         ret = bus_register(&ide_bus_type);
1376         if (ret < 0) {
1377                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1378                 return ret;
1379         }
1380
1381         ide_port_class = class_create(THIS_MODULE, "ide_port");
1382         if (IS_ERR(ide_port_class)) {
1383                 ret = PTR_ERR(ide_port_class);
1384                 goto out_port_class;
1385         }
1386         ide_port_class->dev_release = ide_port_class_release;
1387
1388         init_ide_data();
1389
1390         proc_ide_create();
1391
1392         return 0;
1393
1394 out_port_class:
1395         bus_unregister(&ide_bus_type);
1396
1397         return ret;
1398 }
1399
1400 #ifdef MODULE
1401 static char *options = NULL;
1402 module_param(options, charp, 0);
1403 MODULE_LICENSE("GPL");
1404
1405 static void __init parse_options (char *line)
1406 {
1407         char *next = line;
1408
1409         if (line == NULL || !*line)
1410                 return;
1411         while ((line = next) != NULL) {
1412                 if ((next = strchr(line,' ')) != NULL)
1413                         *next++ = 0;
1414                 if (!ide_setup(line))
1415                         printk (KERN_INFO "Unknown option '%s'\n", line);
1416         }
1417 }
1418
1419 int __init init_module (void)
1420 {
1421         parse_options(options);
1422         return ide_init();
1423 }
1424
1425 void __exit cleanup_module (void)
1426 {
1427         int index;
1428
1429         for (index = 0; index < MAX_HWIFS; ++index)
1430                 ide_unregister(index);
1431
1432         proc_ide_destroy();
1433
1434         class_destroy(ide_port_class);
1435
1436         bus_unregister(&ide_bus_type);
1437 }
1438
1439 #else /* !MODULE */
1440
1441 __setup("", ide_setup);
1442
1443 module_init(ide_init);
1444
1445 #endif /* MODULE */