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