git.oblomov.eu Git - linux-2.6/blob - 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 #ifndef CONFIG_IDE_ARCH_OBSOLETE_DEFAULTS
 169 # define ide_default_io_base(index)     (0)
 170 # define ide_init_default_irq(base)     (0)
 171 #endif
 172
 173 /*
 174  * init_ide_data() sets reasonable default values into all fields
 175  * of all instances of the hwifs and drives, but only on the first call.
 176  * Subsequent calls have no effect (they don't wipe out anything).
 177  *
 178  * This routine is normally called at driver initialization time,
 179  * but may also be called MUCH earlier during kernel "command-line"
 180  * parameter processing.  As such, we cannot depend on any other parts
 181  * of the kernel (such as memory allocation) to be functioning yet.
 182  *
 183  * This is too bad, as otherwise we could dynamically allocate the
 184  * ide_drive_t structs as needed, rather than always consuming memory
 185  * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
 186  *
 187  * FIXME: We should stuff the setup data into __init and copy the
 188  * relevant hwifs/allocate them properly during boot.
 189  */
 190 #define MAGIC_COOKIE 0x12345678
 191 static void __init init_ide_data (void)
 192 {
 193         unsigned int index;
 194         static unsigned long magic_cookie = MAGIC_COOKIE;
 195         hw_regs_t hw;
 196
 197         if (magic_cookie != MAGIC_COOKIE)
 198                 return;         /* already initialized */
 199         magic_cookie = 0;
 200
 201         /* Initialise all interface structures */
 202         for (index = 0; index < MAX_HWIFS; ++index) {
 203                 ide_hwif_t *hwif = &ide_hwifs[index];
 204                 unsigned long io_addr = ide_default_io_base(index);
 205                 unsigned long ctl_addr = ide_default_io_ctl(io_addr);
 206
 207                 ide_init_port_data(hwif, index);
 208
 209 #ifdef CONFIG_IDE_ARCH_OBSOLETE_INIT
 210                 memset(&hw, 0, sizeof(hw));
 211                 ide_std_init_ports(&hw, io_addr, ctl_addr);
 212                 memcpy(hwif->io_ports, hw.io_ports, sizeof(hw.io_ports));
 213 #endif
 214                 hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
 215 #if !defined(CONFIG_PPC32) || defined(CONFIG_PPLUS) || !defined(CONFIG_PCI)
 216                 hwif->irq =
 217                         ide_init_default_irq(hwif->io_ports[IDE_DATA_OFFSET]);
 218 #endif
 219         }
 220 }
 221
 222 /**
 223  *      ide_system_bus_speed    -       guess bus speed
 224  *
 225  *      ide_system_bus_speed() returns what we think is the system VESA/PCI
 226  *      bus speed (in MHz). This is used for calculating interface PIO timings.
 227  *      The default is 40 for known PCI systems, 50 otherwise.
 228  *      The "idebus=xx" parameter can be used to override this value.
 229  *      The actual value to be used is computed/displayed the first time
 230  *      through. Drivers should only use this as a last resort.
 231  *
 232  *      Returns a guessed speed in MHz.
 233  */
 234
 235 static int ide_system_bus_speed(void)
 236 {
 237 #ifdef CONFIG_PCI
 238         static struct pci_device_id pci_default[] = {
 239                 { PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID) },
 240                 { }
 241         };
 242 #else
 243 #define pci_default 0
 244 #endif /* CONFIG_PCI */
 245
 246         /* user supplied value */
 247         if (idebus_parameter)
 248                 return idebus_parameter;
 249
 250         /* safe default value for PCI or VESA and PCI*/
 251         return pci_dev_present(pci_default) ? 33 : 50;
 252 }
 253
 254 ide_hwif_t * ide_find_port(unsigned long base)
 255 {
 256         ide_hwif_t *hwif;
 257         int i;
 258
 259         for (i = 0; i < MAX_HWIFS; i++) {
 260                 hwif = &ide_hwifs[i];
 261                 if (hwif->io_ports[IDE_DATA_OFFSET] == base)
 262                         goto found;
 263         }
 264
 265         for (i = 0; i < MAX_HWIFS; i++) {
 266                 hwif = &ide_hwifs[i];
 267                 if (hwif->chipset == ide_unknown)
 268                         goto found;
 269         }
 270
 271         hwif = NULL;
 272 found:
 273         return hwif;
 274 }
 275
 276 EXPORT_SYMBOL_GPL(ide_find_port);
 277
 278 static struct resource* hwif_request_region(ide_hwif_t *hwif,
 279                                             unsigned long addr, int num)
 280 {
 281         struct resource *res = request_region(addr, num, hwif->name);
 282
 283         if (!res)
 284                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
 285                                 hwif->name, addr, addr+num-1);
 286         return res;
 287 }
 288
 289 /**
 290  *      ide_hwif_request_regions - request resources for IDE
 291  *      @hwif: interface to use
 292  *
 293  *      Requests all the needed resources for an interface.
 294  *      Right now core IDE code does this work which is deeply wrong.
 295  *      MMIO leaves it to the controller driver,
 296  *      PIO will migrate this way over time.
 297  */
 298
 299 int ide_hwif_request_regions(ide_hwif_t *hwif)
 300 {
 301         unsigned long addr;
 302         unsigned int i;
 303
 304         if (hwif->mmio)
 305                 return 0;
 306         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 307         if (addr && !hwif_request_region(hwif, addr, 1))
 308                 goto control_region_busy;
 309         hwif->straight8 = 0;
 310         addr = hwif->io_ports[IDE_DATA_OFFSET];
 311         if ((addr | 7) == hwif->io_ports[IDE_STATUS_OFFSET]) {
 312                 if (!hwif_request_region(hwif, addr, 8))
 313                         goto data_region_busy;
 314                 hwif->straight8 = 1;
 315                 return 0;
 316         }
 317         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
 318                 addr = hwif->io_ports[i];
 319                 if (!hwif_request_region(hwif, addr, 1)) {
 320                         while (--i)
 321                                 release_region(addr, 1);
 322                         goto data_region_busy;
 323                 }
 324         }
 325         return 0;
 326
 327 data_region_busy:
 328         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 329         if (addr)
 330                 release_region(addr, 1);
 331 control_region_busy:
 332         /* If any errors are return, we drop the hwif interface. */
 333         return -EBUSY;
 334 }
 335
 336 /**
 337  *      ide_hwif_release_regions - free IDE resources
 338  *
 339  *      Note that we only release the standard ports,
 340  *      and do not even try to handle any extra ports
 341  *      allocated for weird IDE interface chipsets.
 342  *
 343  *      Note also that we don't yet handle mmio resources here. More
 344  *      importantly our caller should be doing this so we need to
 345  *      restructure this as a helper function for drivers.
 346  */
 347
 348 void ide_hwif_release_regions(ide_hwif_t *hwif)
 349 {
 350         u32 i = 0;
 351
 352         if (hwif->mmio)
 353                 return;
 354         if (hwif->io_ports[IDE_CONTROL_OFFSET])
 355                 release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
 356         if (hwif->straight8) {
 357                 release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
 358                 return;
 359         }
 360         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
 361                 if (hwif->io_ports[i])
 362                         release_region(hwif->io_ports[i], 1);
 363 }
 364
 365 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
 366 {
 367         ide_hwgroup_t *hwgroup = hwif->hwgroup;
 368
 369         spin_lock_irq(&ide_lock);
 370         /*
 371          * Remove us from the hwgroup, and free
 372          * the hwgroup if we were the only member
 373          */
 374         if (hwif->next == hwif) {
 375                 BUG_ON(hwgroup->hwif != hwif);
 376                 kfree(hwgroup);
 377         } else {
 378                 /* There is another interface in hwgroup.
 379                  * Unlink us, and set hwgroup->drive and ->hwif to
 380                  * something sane.
 381                  */
 382                 ide_hwif_t *g = hwgroup->hwif;
 383
 384                 while (g->next != hwif)
 385                         g = g->next;
 386                 g->next = hwif->next;
 387                 if (hwgroup->hwif == hwif) {
 388                         /* Chose a random hwif for hwgroup->hwif.
 389                          * It's guaranteed that there are no drives
 390                          * left in the hwgroup.
 391                          */
 392                         BUG_ON(hwgroup->drive != NULL);
 393                         hwgroup->hwif = g;
 394                 }
 395                 BUG_ON(hwgroup->hwif == hwif);
 396         }
 397         spin_unlock_irq(&ide_lock);
 398 }
 399
 400 /* Called with ide_lock held. */
 401 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
 402 {
 403         int i;
 404
 405         for (i = 0; i < MAX_DRIVES; i++) {
 406                 ide_drive_t *drive = &hwif->drives[i];
 407
 408                 if (drive->present) {
 409                         spin_unlock_irq(&ide_lock);
 410                         device_unregister(&drive->gendev);
 411                         wait_for_completion(&drive->gendev_rel_comp);
 412                         spin_lock_irq(&ide_lock);
 413                 }
 414         }
 415 }
 416
 417 void ide_port_unregister_devices(ide_hwif_t *hwif)
 418 {
 419         mutex_lock(&ide_cfg_mtx);
 420         spin_lock_irq(&ide_lock);
 421         __ide_port_unregister_devices(hwif);
 422         hwif->present = 0;
 423         ide_port_init_devices_data(hwif);
 424         spin_unlock_irq(&ide_lock);
 425         mutex_unlock(&ide_cfg_mtx);
 426 }
 427 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
 428
 429 /**
 430  *      ide_unregister          -       free an IDE interface
 431  *      @index: index of interface (will change soon to a pointer)
 432  *
 433  *      Perform the final unregister of an IDE interface. At the moment
 434  *      we don't refcount interfaces so this will also get split up.
 435  *
 436  *      Locking:
 437  *      The caller must not hold the IDE locks
 438  *      The drive present/vanishing is not yet properly locked
 439  *      Take care with the callbacks. These have been split to avoid
 440  *      deadlocking the IDE layer. The shutdown callback is called
 441  *      before we take the lock and free resources. It is up to the
 442  *      caller to be sure there is no pending I/O here, and that
 443  *      the interface will not be reopened (present/vanishing locking
 444  *      isn't yet done BTW). After we commit to the final kill we
 445  *      call the cleanup callback with the ide locks held.
 446  *
 447  *      Unregister restores the hwif structures to the default state.
 448  *      This is raving bonkers.
 449  */
 450
 451 void ide_unregister(unsigned int index)
 452 {
 453         ide_hwif_t *hwif, *g;
 454         ide_hwgroup_t *hwgroup;
 455         int irq_count = 0;
 456
 457         BUG_ON(index >= MAX_HWIFS);
 458
 459         BUG_ON(in_interrupt());
 460         BUG_ON(irqs_disabled());
 461         mutex_lock(&ide_cfg_mtx);
 462         spin_lock_irq(&ide_lock);
 463         hwif = &ide_hwifs[index];
 464         if (!hwif->present)
 465                 goto abort;
 466         __ide_port_unregister_devices(hwif);
 467         hwif->present = 0;
 468
 469         spin_unlock_irq(&ide_lock);
 470
 471         ide_proc_unregister_port(hwif);
 472
 473         hwgroup = hwif->hwgroup;
 474         /*
 475          * free the irq if we were the only hwif using it
 476          */
 477         g = hwgroup->hwif;
 478         do {
 479                 if (g->irq == hwif->irq)
 480                         ++irq_count;
 481                 g = g->next;
 482         } while (g != hwgroup->hwif);
 483         if (irq_count == 1)
 484                 free_irq(hwif->irq, hwgroup);
 485
 486         ide_remove_port_from_hwgroup(hwif);
 487
 488         device_unregister(hwif->portdev);
 489         device_unregister(&hwif->gendev);
 490         wait_for_completion(&hwif->gendev_rel_comp);
 491
 492         /*
 493          * Remove us from the kernel's knowledge
 494          */
 495         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 496         kfree(hwif->sg_table);
 497         unregister_blkdev(hwif->major, hwif->name);
 498         spin_lock_irq(&ide_lock);
 499
 500         if (hwif->dma_base)
 501                 (void)ide_release_dma(hwif);
 502
 503         ide_hwif_release_regions(hwif);
 504
 505         /* restore hwif data to pristine status */
 506         ide_init_port_data(hwif, index);
 507
 508 abort:
 509         spin_unlock_irq(&ide_lock);
 510         mutex_unlock(&ide_cfg_mtx);
 511 }
 512
 513 EXPORT_SYMBOL(ide_unregister);
 514
 515 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
 516 {
 517         memcpy(hwif->io_ports, hw->io_ports, sizeof(hwif->io_ports));
 518         hwif->irq = hw->irq;
 519         hwif->noprobe = 0;
 520         hwif->chipset = hw->chipset;
 521         hwif->gendev.parent = hw->dev;
 522         hwif->ack_intr = hw->ack_intr;
 523 }
 524 EXPORT_SYMBOL_GPL(ide_init_port_hw);
 525
 526 /*
 527  *      Locks for IDE setting functionality
 528  */
 529
 530 DEFINE_MUTEX(ide_setting_mtx);
 531
 532 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 533
 534 /**
 535  *      ide_spin_wait_hwgroup   -       wait for group
 536  *      @drive: drive in the group
 537  *
 538  *      Wait for an IDE device group to go non busy and then return
 539  *      holding the ide_lock which guards the hwgroup->busy status
 540  *      and right to use it.
 541  */
 542
 543 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 544 {
 545         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 546         unsigned long timeout = jiffies + (3 * HZ);
 547
 548         spin_lock_irq(&ide_lock);
 549
 550         while (hwgroup->busy) {
 551                 unsigned long lflags;
 552                 spin_unlock_irq(&ide_lock);
 553                 local_irq_set(lflags);
 554                 if (time_after(jiffies, timeout)) {
 555                         local_irq_restore(lflags);
 556                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 557                         return -EBUSY;
 558                 }
 559                 local_irq_restore(lflags);
 560                 spin_lock_irq(&ide_lock);
 561         }
 562         return 0;
 563 }
 564
 565 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 566
 567 int set_io_32bit(ide_drive_t *drive, int arg)
 568 {
 569         if (drive->no_io_32bit)
 570                 return -EPERM;
 571
 572         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 573                 return -EINVAL;
 574
 575         if (ide_spin_wait_hwgroup(drive))
 576                 return -EBUSY;
 577
 578         drive->io_32bit = arg;
 579
 580         spin_unlock_irq(&ide_lock);
 581
 582         return 0;
 583 }
 584
 585 static int set_ksettings(ide_drive_t *drive, int arg)
 586 {
 587         if (arg < 0 || arg > 1)
 588                 return -EINVAL;
 589
 590         if (ide_spin_wait_hwgroup(drive))
 591                 return -EBUSY;
 592         drive->keep_settings = arg;
 593         spin_unlock_irq(&ide_lock);
 594
 595         return 0;
 596 }
 597
 598 int set_using_dma(ide_drive_t *drive, int arg)
 599 {
 600 #ifdef CONFIG_BLK_DEV_IDEDMA
 601         ide_hwif_t *hwif = drive->hwif;
 602         int err = -EPERM;
 603
 604         if (arg < 0 || arg > 1)
 605                 return -EINVAL;
 606
 607         if (!drive->id || !(drive->id->capability & 1))
 608                 goto out;
 609
 610         if (hwif->dma_host_set == NULL)
 611                 goto out;
 612
 613         err = -EBUSY;
 614         if (ide_spin_wait_hwgroup(drive))
 615                 goto out;
 616         /*
 617          * set ->busy flag, unlock and let it ride
 618          */
 619         hwif->hwgroup->busy = 1;
 620         spin_unlock_irq(&ide_lock);
 621
 622         err = 0;
 623
 624         if (arg) {
 625                 if (ide_set_dma(drive))
 626                         err = -EIO;
 627         } else
 628                 ide_dma_off(drive);
 629
 630         /*
 631          * lock, clear ->busy flag and unlock before leaving
 632          */
 633         spin_lock_irq(&ide_lock);
 634         hwif->hwgroup->busy = 0;
 635         spin_unlock_irq(&ide_lock);
 636 out:
 637         return err;
 638 #else
 639         if (arg < 0 || arg > 1)
 640                 return -EINVAL;
 641
 642         return -EPERM;
 643 #endif
 644 }
 645
 646 int set_pio_mode(ide_drive_t *drive, int arg)
 647 {
 648         struct request rq;
 649
 650         if (arg < 0 || arg > 255)
 651                 return -EINVAL;
 652
 653         if (drive->hwif->set_pio_mode == NULL)
 654                 return -ENOSYS;
 655
 656         if (drive->special.b.set_tune)
 657                 return -EBUSY;
 658
 659         ide_init_drive_cmd(&rq);
 660         rq.cmd_type = REQ_TYPE_ATA_TASKFILE;
 661
 662         drive->tune_req = (u8) arg;
 663         drive->special.b.set_tune = 1;
 664         (void) ide_do_drive_cmd(drive, &rq, ide_wait);
 665         return 0;
 666 }
 667
 668 static int set_unmaskirq(ide_drive_t *drive, int arg)
 669 {
 670         if (drive->no_unmask)
 671                 return -EPERM;
 672
 673         if (arg < 0 || arg > 1)
 674                 return -EINVAL;
 675
 676         if (ide_spin_wait_hwgroup(drive))
 677                 return -EBUSY;
 678         drive->unmask = arg;
 679         spin_unlock_irq(&ide_lock);
 680
 681         return 0;
 682 }
 683
 684 /**
 685  *      system_bus_clock        -       clock guess
 686  *
 687  *      External version of the bus clock guess used by very old IDE drivers
 688  *      for things like VLB timings. Should not be used.
 689  */
 690
 691 int system_bus_clock (void)
 692 {
 693         return system_bus_speed;
 694 }
 695
 696 EXPORT_SYMBOL(system_bus_clock);
 697
 698 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 699 {
 700         ide_drive_t *drive = dev->driver_data;
 701         ide_hwif_t *hwif = HWIF(drive);
 702         struct request rq;
 703         struct request_pm_state rqpm;
 704         ide_task_t args;
 705         int ret;
 706
 707         /* Call ACPI _GTM only once */
 708         if (!(drive->dn % 2))
 709                 ide_acpi_get_timing(hwif);
 710
 711         memset(&rq, 0, sizeof(rq));
 712         memset(&rqpm, 0, sizeof(rqpm));
 713         memset(&args, 0, sizeof(args));
 714         rq.cmd_type = REQ_TYPE_PM_SUSPEND;
 715         rq.special = &args;
 716         rq.data = &rqpm;
 717         rqpm.pm_step = ide_pm_state_start_suspend;
 718         if (mesg.event == PM_EVENT_PRETHAW)
 719                 mesg.event = PM_EVENT_FREEZE;
 720         rqpm.pm_state = mesg.event;
 721
 722         ret = ide_do_drive_cmd(drive, &rq, ide_wait);
 723         /* only call ACPI _PS3 after both drivers are suspended */
 724         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 725                  && hwif->drives[1].present)
 726                  || !hwif->drives[0].present
 727                  || !hwif->drives[1].present))
 728                 ide_acpi_set_state(hwif, 0);
 729         return ret;
 730 }
 731
 732 static int generic_ide_resume(struct device *dev)
 733 {
 734         ide_drive_t *drive = dev->driver_data;
 735         ide_hwif_t *hwif = HWIF(drive);
 736         struct request rq;
 737         struct request_pm_state rqpm;
 738         ide_task_t args;
 739         int err;
 740
 741         /* Call ACPI _STM only once */
 742         if (!(drive->dn % 2)) {
 743                 ide_acpi_set_state(hwif, 1);
 744                 ide_acpi_push_timing(hwif);
 745         }
 746
 747         ide_acpi_exec_tfs(drive);
 748
 749         memset(&rq, 0, sizeof(rq));
 750         memset(&rqpm, 0, sizeof(rqpm));
 751         memset(&args, 0, sizeof(args));
 752         rq.cmd_type = REQ_TYPE_PM_RESUME;
 753         rq.special = &args;
 754         rq.data = &rqpm;
 755         rqpm.pm_step = ide_pm_state_start_resume;
 756         rqpm.pm_state = PM_EVENT_ON;
 757
 758         err = ide_do_drive_cmd(drive, &rq, ide_head_wait);
 759
 760         if (err == 0 && dev->driver) {
 761                 ide_driver_t *drv = to_ide_driver(dev->driver);
 762
 763                 if (drv->resume)
 764                         drv->resume(drive);
 765         }
 766
 767         return err;
 768 }
 769
 770 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 771                         unsigned int cmd, unsigned long arg)
 772 {
 773         unsigned long flags;
 774         ide_driver_t *drv;
 775         void __user *p = (void __user *)arg;
 776         int err = 0, (*setfunc)(ide_drive_t *, int);
 777         u8 *val;
 778
 779         switch (cmd) {
 780         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
 781         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
 782         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
 783         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
 784         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
 785         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
 786         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
 787         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
 788         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
 789         }
 790
 791         switch (cmd) {
 792                 case HDIO_OBSOLETE_IDENTITY:
 793                 case HDIO_GET_IDENTITY:
 794                         if (bdev != bdev->bd_contains)
 795                                 return -EINVAL;
 796                         if (drive->id_read == 0)
 797                                 return -ENOMSG;
 798                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
 799                                 return -EFAULT;
 800                         return 0;
 801
 802                 case HDIO_GET_NICE:
 803                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
 804                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
 805                                         drive->nice1 << IDE_NICE_1,
 806                                         (long __user *) arg);
 807 #ifdef CONFIG_IDE_TASK_IOCTL
 808                 case HDIO_DRIVE_TASKFILE:
 809                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 810                                 return -EACCES;
 811                         switch(drive->media) {
 812                                 case ide_disk:
 813                                         return ide_taskfile_ioctl(drive, cmd, arg);
 814                                 default:
 815                                         return -ENOMSG;
 816                         }
 817 #endif /* CONFIG_IDE_TASK_IOCTL */
 818
 819                 case HDIO_DRIVE_CMD:
 820                         if (!capable(CAP_SYS_RAWIO))
 821                                 return -EACCES;
 822                         return ide_cmd_ioctl(drive, cmd, arg);
 823
 824                 case HDIO_DRIVE_TASK:
 825                         if (!capable(CAP_SYS_RAWIO))
 826                                 return -EACCES;
 827                         return ide_task_ioctl(drive, cmd, arg);
 828                 case HDIO_SET_NICE:
 829                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
 830                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
 831                                 return -EPERM;
 832                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
 833                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
 834                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
 835                                 drive->dsc_overlap = 0;
 836                                 return -EPERM;
 837                         }
 838                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
 839                         return 0;
 840                 case HDIO_DRIVE_RESET:
 841                         if (!capable(CAP_SYS_ADMIN))
 842                                 return -EACCES;
 843
 844                         /*
 845                          *      Abort the current command on the
 846                          *      group if there is one, taking
 847                          *      care not to allow anything else
 848                          *      to be queued and to die on the
 849                          *      spot if we miss one somehow
 850                          */
 851
 852                         spin_lock_irqsave(&ide_lock, flags);
 853
 854                         if (HWGROUP(drive)->resetting) {
 855                                 spin_unlock_irqrestore(&ide_lock, flags);
 856                                 return -EBUSY;
 857                         }
 858
 859                         ide_abort(drive, "drive reset");
 860
 861                         BUG_ON(HWGROUP(drive)->handler);
 862
 863                         /* Ensure nothing gets queued after we
 864                            drop the lock. Reset will clear the busy */
 865
 866                         HWGROUP(drive)->busy = 1;
 867                         spin_unlock_irqrestore(&ide_lock, flags);
 868                         (void) ide_do_reset(drive);
 869
 870                         return 0;
 871                 case HDIO_GET_BUSSTATE:
 872                         if (!capable(CAP_SYS_ADMIN))
 873                                 return -EACCES;
 874                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
 875                                 return -EFAULT;
 876                         return 0;
 877
 878                 case HDIO_SET_BUSSTATE:
 879                         if (!capable(CAP_SYS_ADMIN))
 880                                 return -EACCES;
 881                         return -EOPNOTSUPP;
 882                 default:
 883                         return -EINVAL;
 884         }
 885
 886 read_val:
 887         mutex_lock(&ide_setting_mtx);
 888         spin_lock_irqsave(&ide_lock, flags);
 889         err = *val;
 890         spin_unlock_irqrestore(&ide_lock, flags);
 891         mutex_unlock(&ide_setting_mtx);
 892         return err >= 0 ? put_user(err, (long __user *)arg) : err;
 893
 894 set_val:
 895         if (bdev != bdev->bd_contains)
 896                 err = -EINVAL;
 897         else {
 898                 if (!capable(CAP_SYS_ADMIN))
 899                         err = -EACCES;
 900                 else {
 901                         mutex_lock(&ide_setting_mtx);
 902                         err = setfunc(drive, arg);
 903                         mutex_unlock(&ide_setting_mtx);
 904                 }
 905         }
 906         return err;
 907 }
 908
 909 EXPORT_SYMBOL(generic_ide_ioctl);
 910
 911 /*
 912  * stridx() returns the offset of c within s,
 913  * or -1 if c is '\0' or not found within s.
 914  */
 915 static int __init stridx (const char *s, char c)
 916 {
 917         char *i = strchr(s, c);
 918         return (i && c) ? i - s : -1;
 919 }
 920
 921 /*
 922  * match_parm() does parsing for ide_setup():
 923  *
 924  * 1. the first char of s must be '='.
 925  * 2. if the remainder matches one of the supplied keywords,
 926  *     the index (1 based) of the keyword is negated and returned.
 927  * 3. if the remainder is a series of no more than max_vals numbers
 928  *     separated by commas, the numbers are saved in vals[] and a
 929  *     count of how many were saved is returned.  Base10 is assumed,
 930  *     and base16 is allowed when prefixed with "0x".
 931  * 4. otherwise, zero is returned.
 932  */
 933 static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
 934 {
 935         static const char *decimal = "0123456789";
 936         static const char *hex = "0123456789abcdef";
 937         int i, n;
 938
 939         if (*s++ == '=') {
 940                 /*
 941                  * Try matching against the supplied keywords,
 942                  * and return -(index+1) if we match one
 943                  */
 944                 if (keywords != NULL) {
 945                         for (i = 0; *keywords != NULL; ++i) {
 946                                 if (!strcmp(s, *keywords++))
 947                                         return -(i+1);
 948                         }
 949                 }
 950                 /*
 951                  * Look for a series of no more than "max_vals"
 952                  * numeric values separated by commas, in base10,
 953                  * or base16 when prefixed with "0x".
 954                  * Return a count of how many were found.
 955                  */
 956                 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
 957                         vals[n] = i;
 958                         while ((i = stridx(decimal, *++s)) >= 0)
 959                                 vals[n] = (vals[n] * 10) + i;
 960                         if (*s == 'x' && !vals[n]) {
 961                                 while ((i = stridx(hex, *++s)) >= 0)
 962                                         vals[n] = (vals[n] * 0x10) + i;
 963                         }
 964                         if (++n == max_vals)
 965                                 break;
 966                         if (*s == ',' || *s == ';')
 967                                 ++s;
 968                 }
 969                 if (!*s)
 970                         return n;
 971         }
 972         return 0;       /* zero = nothing matched */
 973 }
 974
 975 extern int probe_ali14xx;
 976 extern int probe_umc8672;
 977 extern int probe_dtc2278;
 978 extern int probe_ht6560b;
 979 extern int probe_qd65xx;
 980 extern int cmd640_vlb;
 981
 982 static int __initdata is_chipset_set;
 983
 984 /*
 985  * ide_setup() gets called VERY EARLY during initialization,
 986  * to handle kernel "command line" strings beginning with "hdx=" or "ide".
 987  *
 988  * Remember to update Documentation/ide/ide.txt if you change something here.
 989  */
 990 static int __init ide_setup(char *s)
 991 {
 992         int i, vals[3];
 993         ide_hwif_t *hwif;
 994         ide_drive_t *drive;
 995         unsigned int hw, unit;
 996         const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
 997         const char max_hwif  = '0' + (MAX_HWIFS - 1);
 998
 999
1000         if (strncmp(s,"hd",2) == 0 && s[2] == '=')      /* hd= is for hd.c   */
1001                 return 0;                               /* driver and not us */
1002
1003         if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
1004                 return 0;
1005
1006         printk(KERN_INFO "ide_setup: %s", s);
1007         init_ide_data ();
1008
1009 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
1010         if (!strcmp(s, "ide=doubler")) {
1011                 extern int ide_doubler;
1012
1013                 printk(" : Enabled support for IDE doublers\n");
1014                 ide_doubler = 1;
1015                 return 1;
1016         }
1017 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
1018
1019         if (!strcmp(s, "ide=nodma")) {
1020                 printk(" : Prevented DMA\n");
1021                 noautodma = 1;
1022                 goto obsolete_option;
1023         }
1024
1025 #ifdef CONFIG_BLK_DEV_IDEACPI
1026         if (!strcmp(s, "ide=noacpi")) {
1027                 //printk(" : Disable IDE ACPI support.\n");
1028                 ide_noacpi = 1;
1029                 return 1;
1030         }
1031         if (!strcmp(s, "ide=acpigtf")) {
1032                 //printk(" : Enable IDE ACPI _GTF support.\n");
1033                 ide_noacpitfs = 0;
1034                 return 1;
1035         }
1036         if (!strcmp(s, "ide=acpionboot")) {
1037                 //printk(" : Call IDE ACPI methods on boot.\n");
1038                 ide_noacpionboot = 0;
1039                 return 1;
1040         }
1041 #endif /* CONFIG_BLK_DEV_IDEACPI */
1042
1043         /*
1044          * Look for drive options:  "hdx="
1045          */
1046         if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
1047                 const char *hd_words[] = {
1048                         "none", "noprobe", "nowerr", "cdrom", "nodma",
1049                         "autotune", "noautotune", "-8", "-9", "-10",
1050                         "noflush", "remap", "remap63", "scsi", NULL };
1051                 unit = s[2] - 'a';
1052                 hw   = unit / MAX_DRIVES;
1053                 unit = unit % MAX_DRIVES;
1054                 hwif = &ide_hwifs[hw];
1055                 drive = &hwif->drives[unit];
1056                 if (strncmp(s + 4, "ide-", 4) == 0) {
1057                         strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
1058                         goto obsolete_option;
1059                 }
1060                 switch (match_parm(&s[3], hd_words, vals, 3)) {
1061                         case -1: /* "none" */
1062                         case -2: /* "noprobe" */
1063                                 drive->noprobe = 1;
1064                                 goto done;
1065                         case -3: /* "nowerr" */
1066                                 drive->bad_wstat = BAD_R_STAT;
1067                                 hwif->noprobe = 0;
1068                                 goto done;
1069                         case -4: /* "cdrom" */
1070                                 drive->present = 1;
1071                                 drive->media = ide_cdrom;
1072                                 /* an ATAPI device ignores DRDY */
1073                                 drive->ready_stat = 0;
1074                                 hwif->noprobe = 0;
1075                                 goto done;
1076                         case -5: /* nodma */
1077                                 drive->nodma = 1;
1078                                 goto done;
1079                         case -6: /* "autotune" */
1080                                 drive->autotune = IDE_TUNE_AUTO;
1081                                 goto obsolete_option;
1082                         case -7: /* "noautotune" */
1083                                 drive->autotune = IDE_TUNE_NOAUTO;
1084                                 goto obsolete_option;
1085                         case -11: /* noflush */
1086                                 drive->noflush = 1;
1087                                 goto done;
1088                         case -12: /* "remap" */
1089                                 drive->remap_0_to_1 = 1;
1090                                 goto obsolete_option;
1091                         case -13: /* "remap63" */
1092                                 drive->sect0 = 63;
1093                                 goto obsolete_option;
1094                         case -14: /* "scsi" */
1095                                 drive->scsi = 1;
1096                                 goto obsolete_option;
1097                         case 3: /* cyl,head,sect */
1098                                 drive->media    = ide_disk;
1099                                 drive->ready_stat = READY_STAT;
1100                                 drive->cyl      = drive->bios_cyl  = vals[0];
1101                                 drive->head     = drive->bios_head = vals[1];
1102                                 drive->sect     = drive->bios_sect = vals[2];
1103                                 drive->present  = 1;
1104                                 drive->forced_geom = 1;
1105                                 hwif->noprobe = 0;
1106                                 goto done;
1107                         default:
1108                                 goto bad_option;
1109                 }
1110         }
1111
1112         if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
1113                 goto bad_option;
1114         /*
1115          * Look for bus speed option:  "idebus="
1116          */
1117         if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
1118                 if (match_parm(&s[6], NULL, vals, 1) != 1)
1119                         goto bad_option;
1120                 if (vals[0] >= 20 && vals[0] <= 66) {
1121                         idebus_parameter = vals[0];
1122                 } else
1123                         printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
1124                 goto done;
1125         }
1126         /*
1127          * Look for interface options:  "idex="
1128          */
1129         if (s[3] >= '0' && s[3] <= max_hwif) {
1130                 /*
1131                  * Be VERY CAREFUL changing this: note hardcoded indexes below
1132                  * (-8, -9, -10) are reserved to ease the hardcoding.
1133                  */
1134                 static const char *ide_words[] = {
1135                         "noprobe", "serialize", "minus3", "minus4",
1136                         "reset", "minus6", "ata66", "minus8", "minus9",
1137                         "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
1138                         "dtc2278", "umc8672", "ali14xx", NULL };
1139
1140                 hw = s[3] - '0';
1141                 hwif = &ide_hwifs[hw];
1142                 i = match_parm(&s[4], ide_words, vals, 3);
1143
1144                 /*
1145                  * Cryptic check to ensure chipset not already set for hwif.
1146                  * Note: we can't depend on hwif->chipset here.
1147                  */
1148                 if (i >= -18 && i <= -11) {
1149                         /* chipset already specified */
1150                         if (is_chipset_set)
1151                                 goto bad_option;
1152                         /* these drivers are for "ide0=" only */
1153                         if (hw != 0)
1154                                 goto bad_hwif;
1155                         is_chipset_set = 1;
1156                         printk("\n");
1157                 }
1158
1159                 switch (i) {
1160 #ifdef CONFIG_BLK_DEV_ALI14XX
1161                         case -17: /* "ali14xx" */
1162                                 probe_ali14xx = 1;
1163                                 goto obsolete_option;
1164 #endif
1165 #ifdef CONFIG_BLK_DEV_UMC8672
1166                         case -16: /* "umc8672" */
1167                                 probe_umc8672 = 1;
1168                                 goto obsolete_option;
1169 #endif
1170 #ifdef CONFIG_BLK_DEV_DTC2278
1171                         case -15: /* "dtc2278" */
1172                                 probe_dtc2278 = 1;
1173                                 goto obsolete_option;
1174 #endif
1175 #ifdef CONFIG_BLK_DEV_CMD640
1176                         case -14: /* "cmd640_vlb" */
1177                                 cmd640_vlb = 1;
1178                                 goto obsolete_option;
1179 #endif
1180 #ifdef CONFIG_BLK_DEV_HT6560B
1181                         case -13: /* "ht6560b" */
1182                                 probe_ht6560b = 1;
1183                                 goto obsolete_option;
1184 #endif
1185 #ifdef CONFIG_BLK_DEV_QD65XX
1186                         case -12: /* "qd65xx" */
1187                                 probe_qd65xx = 1;
1188                                 goto obsolete_option;
1189 #endif
1190 #ifdef CONFIG_BLK_DEV_4DRIVES
1191                         case -11: /* "four" drives on one set of ports */
1192                         {
1193                                 ide_hwif_t *mate = &ide_hwifs[hw^1];
1194                                 mate->drives[0].select.all ^= 0x20;
1195                                 mate->drives[1].select.all ^= 0x20;
1196                                 hwif->chipset = mate->chipset = ide_4drives;
1197                                 mate->irq = hwif->irq;
1198                                 memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
1199                                 hwif->mate = mate;
1200                                 mate->mate = hwif;
1201                                 hwif->serialized = mate->serialized = 1;
1202                                 goto obsolete_option;
1203                         }
1204 #endif /* CONFIG_BLK_DEV_4DRIVES */
1205                         case -10: /* minus10 */
1206                         case -9: /* minus9 */
1207                         case -8: /* minus8 */
1208                         case -6:
1209                         case -4:
1210                         case -3:
1211                                 goto bad_option;
1212                         case -7: /* ata66 */
1213 #ifdef CONFIG_BLK_DEV_IDEPCI
1214                                 /*
1215                                  * Use ATA_CBL_PATA40_SHORT so drive side
1216                                  * cable detection is also overriden.
1217                                  */
1218                                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1219                                 goto obsolete_option;
1220 #else
1221                                 goto bad_hwif;
1222 #endif
1223                         case -5: /* "reset" */
1224                                 hwif->reset = 1;
1225                                 goto obsolete_option;
1226                         case -2: /* "serialize" */
1227                                 hwif->mate = &ide_hwifs[hw^1];
1228                                 hwif->mate->mate = hwif;
1229                                 hwif->serialized = hwif->mate->serialized = 1;
1230                                 goto obsolete_option;
1231
1232                         case -1: /* "noprobe" */
1233                                 hwif->noprobe = 1;
1234                                 goto obsolete_option;
1235                         case 0:
1236                         case 1:
1237                         case 2:
1238                         case 3:
1239                                 goto bad_option;
1240                         default:
1241                                 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
1242                                 return 1;
1243                 }
1244         }
1245 bad_option:
1246         printk(" -- BAD OPTION\n");
1247         return 1;
1248 obsolete_option:
1249         printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
1250         return 1;
1251 bad_hwif:
1252         printk("-- NOT SUPPORTED ON ide%d", hw);
1253 done:
1254         printk("\n");
1255         return 1;
1256 }
1257
1258 EXPORT_SYMBOL(ide_lock);
1259
1260 static int ide_bus_match(struct device *dev, struct device_driver *drv)
1261 {
1262         return 1;
1263 }
1264
1265 static char *media_string(ide_drive_t *drive)
1266 {
1267         switch (drive->media) {
1268         case ide_disk:
1269                 return "disk";
1270         case ide_cdrom:
1271                 return "cdrom";
1272         case ide_tape:
1273                 return "tape";
1274         case ide_floppy:
1275                 return "floppy";
1276         case ide_optical:
1277                 return "optical";
1278         default:
1279                 return "UNKNOWN";
1280         }
1281 }
1282
1283 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
1284 {
1285         ide_drive_t *drive = to_ide_device(dev);
1286         return sprintf(buf, "%s\n", media_string(drive));
1287 }
1288
1289 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
1290 {
1291         ide_drive_t *drive = to_ide_device(dev);
1292         return sprintf(buf, "%s\n", drive->name);
1293 }
1294
1295 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1296 {
1297         ide_drive_t *drive = to_ide_device(dev);
1298         return sprintf(buf, "ide:m-%s\n", media_string(drive));
1299 }
1300
1301 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
1302                           char *buf)
1303 {
1304         ide_drive_t *drive = to_ide_device(dev);
1305         return sprintf(buf, "%s\n", drive->id->model);
1306 }
1307
1308 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
1309                              char *buf)
1310 {
1311         ide_drive_t *drive = to_ide_device(dev);
1312         return sprintf(buf, "%s\n", drive->id->fw_rev);
1313 }
1314
1315 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
1316                            char *buf)
1317 {
1318         ide_drive_t *drive = to_ide_device(dev);
1319         return sprintf(buf, "%s\n", drive->id->serial_no);
1320 }
1321
1322 static struct device_attribute ide_dev_attrs[] = {
1323         __ATTR_RO(media),
1324         __ATTR_RO(drivename),
1325         __ATTR_RO(modalias),
1326         __ATTR_RO(model),
1327         __ATTR_RO(firmware),
1328         __ATTR(serial, 0400, serial_show, NULL),
1329         __ATTR_NULL
1330 };
1331
1332 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
1333 {
1334         ide_drive_t *drive = to_ide_device(dev);
1335
1336         add_uevent_var(env, "MEDIA=%s", media_string(drive));
1337         add_uevent_var(env, "DRIVENAME=%s", drive->name);
1338         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
1339         return 0;
1340 }
1341
1342 static int generic_ide_probe(struct device *dev)
1343 {
1344         ide_drive_t *drive = to_ide_device(dev);
1345         ide_driver_t *drv = to_ide_driver(dev->driver);
1346
1347         return drv->probe ? drv->probe(drive) : -ENODEV;
1348 }
1349
1350 static int generic_ide_remove(struct device *dev)
1351 {
1352         ide_drive_t *drive = to_ide_device(dev);
1353         ide_driver_t *drv = to_ide_driver(dev->driver);
1354
1355         if (drv->remove)
1356                 drv->remove(drive);
1357
1358         return 0;
1359 }
1360
1361 static void generic_ide_shutdown(struct device *dev)
1362 {
1363         ide_drive_t *drive = to_ide_device(dev);
1364         ide_driver_t *drv = to_ide_driver(dev->driver);
1365
1366         if (dev->driver && drv->shutdown)
1367                 drv->shutdown(drive);
1368 }
1369
1370 struct bus_type ide_bus_type = {
1371         .name           = "ide",
1372         .match          = ide_bus_match,
1373         .uevent         = ide_uevent,
1374         .probe          = generic_ide_probe,
1375         .remove         = generic_ide_remove,
1376         .shutdown       = generic_ide_shutdown,
1377         .dev_attrs      = ide_dev_attrs,
1378         .suspend        = generic_ide_suspend,
1379         .resume         = generic_ide_resume,
1380 };
1381
1382 EXPORT_SYMBOL_GPL(ide_bus_type);
1383
1384 static void ide_port_class_release(struct device *portdev)
1385 {
1386         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1387
1388         put_device(&hwif->gendev);
1389 }
1390
1391 /*
1392  * This is gets invoked once during initialization, to set *everything* up
1393  */
1394 static int __init ide_init(void)
1395 {
1396         int ret;
1397
1398         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
1399         system_bus_speed = ide_system_bus_speed();
1400
1401         printk(KERN_INFO "ide: Assuming %dMHz system bus speed "
1402                          "for PIO modes%s\n", system_bus_speed,
1403                         idebus_parameter ? "" : "; override with idebus=xx");
1404
1405         ret = bus_register(&ide_bus_type);
1406         if (ret < 0) {
1407                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1408                 return ret;
1409         }
1410
1411         ide_port_class = class_create(THIS_MODULE, "ide_port");
1412         if (IS_ERR(ide_port_class)) {
1413                 ret = PTR_ERR(ide_port_class);
1414                 goto out_port_class;
1415         }
1416         ide_port_class->dev_release = ide_port_class_release;
1417
1418         init_ide_data();
1419
1420         proc_ide_create();
1421
1422         return 0;
1423
1424 out_port_class:
1425         bus_unregister(&ide_bus_type);
1426
1427         return ret;
1428 }
1429
1430 #ifdef MODULE
1431 static char *options = NULL;
1432 module_param(options, charp, 0);
1433 MODULE_LICENSE("GPL");
1434
1435 static void __init parse_options (char *line)
1436 {
1437         char *next = line;
1438
1439         if (line == NULL || !*line)
1440                 return;
1441         while ((line = next) != NULL) {
1442                 if ((next = strchr(line,' ')) != NULL)
1443                         *next++ = 0;
1444                 if (!ide_setup(line))
1445                         printk (KERN_INFO "Unknown option '%s'\n", line);
1446         }
1447 }
1448
1449 int __init init_module (void)
1450 {
1451         parse_options(options);
1452         return ide_init();
1453 }
1454
1455 void __exit cleanup_module (void)
1456 {
1457         int index;
1458
1459         for (index = 0; index < MAX_HWIFS; ++index)
1460                 ide_unregister(index);
1461
1462         proc_ide_destroy();
1463
1464         class_destroy(ide_port_class);
1465
1466         bus_unregister(&ide_bus_type);
1467 }
1468
1469 #else /* !MODULE */
1470
1471 __setup("", ide_setup);
1472
1473 module_init(ide_init);
1474
1475 #endif /* MODULE */