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/interrupt.h>
  54 #include <linux/major.h>
  55 #include <linux/errno.h>
  56 #include <linux/genhd.h>
  57 #include <linux/slab.h>
  58 #include <linux/init.h>
  59 #include <linux/pci.h>
  60 #include <linux/ide.h>
  61 #include <linux/completion.h>
  62 #include <linux/device.h>
  63
  64
  65 /* default maximum number of failures */
  66 #define IDE_DEFAULT_MAX_FAILURES        1
  67
  68 struct class *ide_port_class;
  69
  70 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
  71                                         IDE2_MAJOR, IDE3_MAJOR,
  72                                         IDE4_MAJOR, IDE5_MAJOR,
  73                                         IDE6_MAJOR, IDE7_MAJOR,
  74                                         IDE8_MAJOR, IDE9_MAJOR };
  75
  76 DEFINE_MUTEX(ide_cfg_mtx);
  77
  78 __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
  79 EXPORT_SYMBOL(ide_lock);
  80
  81 static void ide_port_init_devices_data(ide_hwif_t *);
  82
  83 /*
  84  * Do not even *think* about calling this!
  85  */
  86 void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
  87 {
  88         /* bulk initialize hwif & drive info with zeros */
  89         memset(hwif, 0, sizeof(ide_hwif_t));
  90
  91         /* fill in any non-zero initial values */
  92         hwif->index     = index;
  93         hwif->major     = ide_hwif_to_major[index];
  94
  95         hwif->name[0]   = 'i';
  96         hwif->name[1]   = 'd';
  97         hwif->name[2]   = 'e';
  98         hwif->name[3]   = '0' + index;
  99
 100         hwif->bus_state = BUSSTATE_ON;
 101
 102         init_completion(&hwif->gendev_rel_comp);
 103
 104         hwif->tp_ops = &default_tp_ops;
 105
 106         ide_port_init_devices_data(hwif);
 107 }
 108
 109 static void ide_port_init_devices_data(ide_hwif_t *hwif)
 110 {
 111         int unit;
 112
 113         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 114                 ide_drive_t *drive = &hwif->drives[unit];
 115                 u8 j = (hwif->index * MAX_DRIVES) + unit;
 116
 117                 memset(drive, 0, sizeof(*drive));
 118
 119                 drive->media                    = ide_disk;
 120                 drive->select.all               = (unit<<4)|0xa0;
 121                 drive->hwif                     = hwif;
 122                 drive->ready_stat               = READY_STAT;
 123                 drive->bad_wstat                = BAD_W_STAT;
 124                 drive->special.b.recalibrate    = 1;
 125                 drive->special.b.set_geometry   = 1;
 126                 drive->name[0]                  = 'h';
 127                 drive->name[1]                  = 'd';
 128                 drive->name[2]                  = 'a' + j;
 129                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
 130
 131                 INIT_LIST_HEAD(&drive->list);
 132                 init_completion(&drive->gendev_rel_comp);
 133         }
 134 }
 135
 136 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
 137 {
 138         ide_hwgroup_t *hwgroup = hwif->hwgroup;
 139
 140         spin_lock_irq(&ide_lock);
 141         /*
 142          * Remove us from the hwgroup, and free
 143          * the hwgroup if we were the only member
 144          */
 145         if (hwif->next == hwif) {
 146                 BUG_ON(hwgroup->hwif != hwif);
 147                 kfree(hwgroup);
 148         } else {
 149                 /* There is another interface in hwgroup.
 150                  * Unlink us, and set hwgroup->drive and ->hwif to
 151                  * something sane.
 152                  */
 153                 ide_hwif_t *g = hwgroup->hwif;
 154
 155                 while (g->next != hwif)
 156                         g = g->next;
 157                 g->next = hwif->next;
 158                 if (hwgroup->hwif == hwif) {
 159                         /* Chose a random hwif for hwgroup->hwif.
 160                          * It's guaranteed that there are no drives
 161                          * left in the hwgroup.
 162                          */
 163                         BUG_ON(hwgroup->drive != NULL);
 164                         hwgroup->hwif = g;
 165                 }
 166                 BUG_ON(hwgroup->hwif == hwif);
 167         }
 168         spin_unlock_irq(&ide_lock);
 169 }
 170
 171 /* Called with ide_lock held. */
 172 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
 173 {
 174         int i;
 175
 176         for (i = 0; i < MAX_DRIVES; i++) {
 177                 ide_drive_t *drive = &hwif->drives[i];
 178
 179                 if (drive->present) {
 180                         spin_unlock_irq(&ide_lock);
 181                         device_unregister(&drive->gendev);
 182                         wait_for_completion(&drive->gendev_rel_comp);
 183                         spin_lock_irq(&ide_lock);
 184                 }
 185         }
 186 }
 187
 188 void ide_port_unregister_devices(ide_hwif_t *hwif)
 189 {
 190         mutex_lock(&ide_cfg_mtx);
 191         spin_lock_irq(&ide_lock);
 192         __ide_port_unregister_devices(hwif);
 193         hwif->present = 0;
 194         ide_port_init_devices_data(hwif);
 195         spin_unlock_irq(&ide_lock);
 196         mutex_unlock(&ide_cfg_mtx);
 197 }
 198 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
 199
 200 /**
 201  *      ide_unregister          -       free an IDE interface
 202  *      @hwif: IDE interface
 203  *
 204  *      Perform the final unregister of an IDE interface. At the moment
 205  *      we don't refcount interfaces so this will also get split up.
 206  *
 207  *      Locking:
 208  *      The caller must not hold the IDE locks
 209  *      The drive present/vanishing is not yet properly locked
 210  *      Take care with the callbacks. These have been split to avoid
 211  *      deadlocking the IDE layer. The shutdown callback is called
 212  *      before we take the lock and free resources. It is up to the
 213  *      caller to be sure there is no pending I/O here, and that
 214  *      the interface will not be reopened (present/vanishing locking
 215  *      isn't yet done BTW). After we commit to the final kill we
 216  *      call the cleanup callback with the ide locks held.
 217  *
 218  *      Unregister restores the hwif structures to the default state.
 219  *      This is raving bonkers.
 220  */
 221
 222 void ide_unregister(ide_hwif_t *hwif)
 223 {
 224         ide_hwif_t *g;
 225         ide_hwgroup_t *hwgroup;
 226         int irq_count = 0;
 227
 228         BUG_ON(in_interrupt());
 229         BUG_ON(irqs_disabled());
 230
 231         mutex_lock(&ide_cfg_mtx);
 232
 233         spin_lock_irq(&ide_lock);
 234         if (hwif->present) {
 235                 __ide_port_unregister_devices(hwif);
 236                 hwif->present = 0;
 237         }
 238         spin_unlock_irq(&ide_lock);
 239
 240         ide_proc_unregister_port(hwif);
 241
 242         hwgroup = hwif->hwgroup;
 243         /*
 244          * free the irq if we were the only hwif using it
 245          */
 246         g = hwgroup->hwif;
 247         do {
 248                 if (g->irq == hwif->irq)
 249                         ++irq_count;
 250                 g = g->next;
 251         } while (g != hwgroup->hwif);
 252         if (irq_count == 1)
 253                 free_irq(hwif->irq, hwgroup);
 254
 255         ide_remove_port_from_hwgroup(hwif);
 256
 257         device_unregister(hwif->portdev);
 258         device_unregister(&hwif->gendev);
 259         wait_for_completion(&hwif->gendev_rel_comp);
 260
 261         /*
 262          * Remove us from the kernel's knowledge
 263          */
 264         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 265         kfree(hwif->sg_table);
 266         unregister_blkdev(hwif->major, hwif->name);
 267
 268         if (hwif->dma_base)
 269                 ide_release_dma_engine(hwif);
 270
 271         spin_lock_irq(&ide_lock);
 272         /* restore hwif data to pristine status */
 273         ide_init_port_data(hwif, hwif->index);
 274         spin_unlock_irq(&ide_lock);
 275
 276         mutex_unlock(&ide_cfg_mtx);
 277 }
 278
 279 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
 280 {
 281         memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
 282         hwif->irq = hw->irq;
 283         hwif->chipset = hw->chipset;
 284         hwif->dev = hw->dev;
 285         hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
 286         hwif->ack_intr = hw->ack_intr;
 287         hwif->config_data = hw->config;
 288 }
 289
 290 /*
 291  *      Locks for IDE setting functionality
 292  */
 293
 294 DEFINE_MUTEX(ide_setting_mtx);
 295
 296 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 297
 298 /**
 299  *      ide_spin_wait_hwgroup   -       wait for group
 300  *      @drive: drive in the group
 301  *
 302  *      Wait for an IDE device group to go non busy and then return
 303  *      holding the ide_lock which guards the hwgroup->busy status
 304  *      and right to use it.
 305  */
 306
 307 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 308 {
 309         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 310         unsigned long timeout = jiffies + (3 * HZ);
 311
 312         spin_lock_irq(&ide_lock);
 313
 314         while (hwgroup->busy) {
 315                 unsigned long lflags;
 316                 spin_unlock_irq(&ide_lock);
 317                 local_irq_set(lflags);
 318                 if (time_after(jiffies, timeout)) {
 319                         local_irq_restore(lflags);
 320                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 321                         return -EBUSY;
 322                 }
 323                 local_irq_restore(lflags);
 324                 spin_lock_irq(&ide_lock);
 325         }
 326         return 0;
 327 }
 328
 329 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 330
 331 int set_io_32bit(ide_drive_t *drive, int arg)
 332 {
 333         if (drive->no_io_32bit)
 334                 return -EPERM;
 335
 336         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 337                 return -EINVAL;
 338
 339         if (ide_spin_wait_hwgroup(drive))
 340                 return -EBUSY;
 341
 342         drive->io_32bit = arg;
 343
 344         spin_unlock_irq(&ide_lock);
 345
 346         return 0;
 347 }
 348
 349 static int set_ksettings(ide_drive_t *drive, int arg)
 350 {
 351         if (arg < 0 || arg > 1)
 352                 return -EINVAL;
 353
 354         if (ide_spin_wait_hwgroup(drive))
 355                 return -EBUSY;
 356         drive->keep_settings = arg;
 357         spin_unlock_irq(&ide_lock);
 358
 359         return 0;
 360 }
 361
 362 int set_using_dma(ide_drive_t *drive, int arg)
 363 {
 364 #ifdef CONFIG_BLK_DEV_IDEDMA
 365         ide_hwif_t *hwif = drive->hwif;
 366         int err = -EPERM;
 367
 368         if (arg < 0 || arg > 1)
 369                 return -EINVAL;
 370
 371         if (!drive->id || !(drive->id->capability & 1))
 372                 goto out;
 373
 374         if (hwif->dma_ops == NULL)
 375                 goto out;
 376
 377         err = -EBUSY;
 378         if (ide_spin_wait_hwgroup(drive))
 379                 goto out;
 380         /*
 381          * set ->busy flag, unlock and let it ride
 382          */
 383         hwif->hwgroup->busy = 1;
 384         spin_unlock_irq(&ide_lock);
 385
 386         err = 0;
 387
 388         if (arg) {
 389                 if (ide_set_dma(drive))
 390                         err = -EIO;
 391         } else
 392                 ide_dma_off(drive);
 393
 394         /*
 395          * lock, clear ->busy flag and unlock before leaving
 396          */
 397         spin_lock_irq(&ide_lock);
 398         hwif->hwgroup->busy = 0;
 399         spin_unlock_irq(&ide_lock);
 400 out:
 401         return err;
 402 #else
 403         if (arg < 0 || arg > 1)
 404                 return -EINVAL;
 405
 406         return -EPERM;
 407 #endif
 408 }
 409
 410 int set_pio_mode(ide_drive_t *drive, int arg)
 411 {
 412         struct request *rq;
 413         ide_hwif_t *hwif = drive->hwif;
 414         const struct ide_port_ops *port_ops = hwif->port_ops;
 415
 416         if (arg < 0 || arg > 255)
 417                 return -EINVAL;
 418
 419         if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
 420             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
 421                 return -ENOSYS;
 422
 423         if (drive->special.b.set_tune)
 424                 return -EBUSY;
 425
 426         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 427         rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
 428
 429         drive->tune_req = (u8) arg;
 430         drive->special.b.set_tune = 1;
 431
 432         blk_execute_rq(drive->queue, NULL, rq, 0);
 433         blk_put_request(rq);
 434
 435         return 0;
 436 }
 437
 438 static int set_unmaskirq(ide_drive_t *drive, int arg)
 439 {
 440         if (drive->no_unmask)
 441                 return -EPERM;
 442
 443         if (arg < 0 || arg > 1)
 444                 return -EINVAL;
 445
 446         if (ide_spin_wait_hwgroup(drive))
 447                 return -EBUSY;
 448         drive->unmask = arg;
 449         spin_unlock_irq(&ide_lock);
 450
 451         return 0;
 452 }
 453
 454 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 455 {
 456         ide_drive_t *drive = dev->driver_data;
 457         ide_hwif_t *hwif = HWIF(drive);
 458         struct request *rq;
 459         struct request_pm_state rqpm;
 460         ide_task_t args;
 461         int ret;
 462
 463         /* Call ACPI _GTM only once */
 464         if (!(drive->dn % 2))
 465                 ide_acpi_get_timing(hwif);
 466
 467         memset(&rqpm, 0, sizeof(rqpm));
 468         memset(&args, 0, sizeof(args));
 469         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 470         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
 471         rq->special = &args;
 472         rq->data = &rqpm;
 473         rqpm.pm_step = ide_pm_state_start_suspend;
 474         if (mesg.event == PM_EVENT_PRETHAW)
 475                 mesg.event = PM_EVENT_FREEZE;
 476         rqpm.pm_state = mesg.event;
 477
 478         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
 479         blk_put_request(rq);
 480         /* only call ACPI _PS3 after both drivers are suspended */
 481         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 482                  && hwif->drives[1].present)
 483                  || !hwif->drives[0].present
 484                  || !hwif->drives[1].present))
 485                 ide_acpi_set_state(hwif, 0);
 486         return ret;
 487 }
 488
 489 static int generic_ide_resume(struct device *dev)
 490 {
 491         ide_drive_t *drive = dev->driver_data;
 492         ide_hwif_t *hwif = HWIF(drive);
 493         struct request *rq;
 494         struct request_pm_state rqpm;
 495         ide_task_t args;
 496         int err;
 497
 498         /* Call ACPI _STM only once */
 499         if (!(drive->dn % 2)) {
 500                 ide_acpi_set_state(hwif, 1);
 501                 ide_acpi_push_timing(hwif);
 502         }
 503
 504         ide_acpi_exec_tfs(drive);
 505
 506         memset(&rqpm, 0, sizeof(rqpm));
 507         memset(&args, 0, sizeof(args));
 508         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 509         rq->cmd_type = REQ_TYPE_PM_RESUME;
 510         rq->cmd_flags |= REQ_PREEMPT;
 511         rq->special = &args;
 512         rq->data = &rqpm;
 513         rqpm.pm_step = ide_pm_state_start_resume;
 514         rqpm.pm_state = PM_EVENT_ON;
 515
 516         err = blk_execute_rq(drive->queue, NULL, rq, 1);
 517         blk_put_request(rq);
 518
 519         if (err == 0 && dev->driver) {
 520                 ide_driver_t *drv = to_ide_driver(dev->driver);
 521
 522                 if (drv->resume)
 523                         drv->resume(drive);
 524         }
 525
 526         return err;
 527 }
 528
 529 static int generic_drive_reset(ide_drive_t *drive)
 530 {
 531         struct request *rq;
 532         int ret = 0;
 533
 534         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 535         rq->cmd_type = REQ_TYPE_SPECIAL;
 536         rq->cmd_len = 1;
 537         rq->cmd[0] = REQ_DRIVE_RESET;
 538         rq->cmd_flags |= REQ_SOFTBARRIER;
 539         if (blk_execute_rq(drive->queue, NULL, rq, 1))
 540                 ret = rq->errors;
 541         blk_put_request(rq);
 542         return ret;
 543 }
 544
 545 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 546                         unsigned int cmd, unsigned long arg)
 547 {
 548         unsigned long flags;
 549         ide_driver_t *drv;
 550         void __user *p = (void __user *)arg;
 551         int err = 0, (*setfunc)(ide_drive_t *, int);
 552         u8 *val;
 553
 554         switch (cmd) {
 555         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
 556         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
 557         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
 558         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
 559         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
 560         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
 561         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
 562         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
 563         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
 564         }
 565
 566         switch (cmd) {
 567                 case HDIO_OBSOLETE_IDENTITY:
 568                 case HDIO_GET_IDENTITY:
 569                         if (bdev != bdev->bd_contains)
 570                                 return -EINVAL;
 571                         if (drive->id_read == 0)
 572                                 return -ENOMSG;
 573                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
 574                                 return -EFAULT;
 575                         return 0;
 576
 577                 case HDIO_GET_NICE:
 578                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
 579                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
 580                                         drive->nice1 << IDE_NICE_1,
 581                                         (long __user *) arg);
 582 #ifdef CONFIG_IDE_TASK_IOCTL
 583                 case HDIO_DRIVE_TASKFILE:
 584                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 585                                 return -EACCES;
 586                         switch(drive->media) {
 587                                 case ide_disk:
 588                                         return ide_taskfile_ioctl(drive, cmd, arg);
 589                                 default:
 590                                         return -ENOMSG;
 591                         }
 592 #endif /* CONFIG_IDE_TASK_IOCTL */
 593
 594                 case HDIO_DRIVE_CMD:
 595                         if (!capable(CAP_SYS_RAWIO))
 596                                 return -EACCES;
 597                         return ide_cmd_ioctl(drive, cmd, arg);
 598
 599                 case HDIO_DRIVE_TASK:
 600                         if (!capable(CAP_SYS_RAWIO))
 601                                 return -EACCES;
 602                         return ide_task_ioctl(drive, cmd, arg);
 603                 case HDIO_SET_NICE:
 604                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
 605                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
 606                                 return -EPERM;
 607                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
 608                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
 609                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
 610                                 drive->dsc_overlap = 0;
 611                                 return -EPERM;
 612                         }
 613                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
 614                         return 0;
 615                 case HDIO_DRIVE_RESET:
 616                         if (!capable(CAP_SYS_ADMIN))
 617                                 return -EACCES;
 618
 619                         return generic_drive_reset(drive);
 620
 621                 case HDIO_GET_BUSSTATE:
 622                         if (!capable(CAP_SYS_ADMIN))
 623                                 return -EACCES;
 624                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
 625                                 return -EFAULT;
 626                         return 0;
 627
 628                 case HDIO_SET_BUSSTATE:
 629                         if (!capable(CAP_SYS_ADMIN))
 630                                 return -EACCES;
 631                         return -EOPNOTSUPP;
 632                 default:
 633                         return -EINVAL;
 634         }
 635
 636 read_val:
 637         mutex_lock(&ide_setting_mtx);
 638         spin_lock_irqsave(&ide_lock, flags);
 639         err = *val;
 640         spin_unlock_irqrestore(&ide_lock, flags);
 641         mutex_unlock(&ide_setting_mtx);
 642         return err >= 0 ? put_user(err, (long __user *)arg) : err;
 643
 644 set_val:
 645         if (bdev != bdev->bd_contains)
 646                 err = -EINVAL;
 647         else {
 648                 if (!capable(CAP_SYS_ADMIN))
 649                         err = -EACCES;
 650                 else {
 651                         mutex_lock(&ide_setting_mtx);
 652                         err = setfunc(drive, arg);
 653                         mutex_unlock(&ide_setting_mtx);
 654                 }
 655         }
 656         return err;
 657 }
 658
 659 EXPORT_SYMBOL(generic_ide_ioctl);
 660
 661 static int ide_bus_match(struct device *dev, struct device_driver *drv)
 662 {
 663         return 1;
 664 }
 665
 666 static char *media_string(ide_drive_t *drive)
 667 {
 668         switch (drive->media) {
 669         case ide_disk:
 670                 return "disk";
 671         case ide_cdrom:
 672                 return "cdrom";
 673         case ide_tape:
 674                 return "tape";
 675         case ide_floppy:
 676                 return "floppy";
 677         case ide_optical:
 678                 return "optical";
 679         default:
 680                 return "UNKNOWN";
 681         }
 682 }
 683
 684 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
 685 {
 686         ide_drive_t *drive = to_ide_device(dev);
 687         return sprintf(buf, "%s\n", media_string(drive));
 688 }
 689
 690 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
 691 {
 692         ide_drive_t *drive = to_ide_device(dev);
 693         return sprintf(buf, "%s\n", drive->name);
 694 }
 695
 696 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 697 {
 698         ide_drive_t *drive = to_ide_device(dev);
 699         return sprintf(buf, "ide:m-%s\n", media_string(drive));
 700 }
 701
 702 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
 703                           char *buf)
 704 {
 705         ide_drive_t *drive = to_ide_device(dev);
 706         return sprintf(buf, "%s\n", drive->id->model);
 707 }
 708
 709 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
 710                              char *buf)
 711 {
 712         ide_drive_t *drive = to_ide_device(dev);
 713         return sprintf(buf, "%s\n", drive->id->fw_rev);
 714 }
 715
 716 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
 717                            char *buf)
 718 {
 719         ide_drive_t *drive = to_ide_device(dev);
 720         return sprintf(buf, "%s\n", drive->id->serial_no);
 721 }
 722
 723 static struct device_attribute ide_dev_attrs[] = {
 724         __ATTR_RO(media),
 725         __ATTR_RO(drivename),
 726         __ATTR_RO(modalias),
 727         __ATTR_RO(model),
 728         __ATTR_RO(firmware),
 729         __ATTR(serial, 0400, serial_show, NULL),
 730         __ATTR_NULL
 731 };
 732
 733 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
 734 {
 735         ide_drive_t *drive = to_ide_device(dev);
 736
 737         add_uevent_var(env, "MEDIA=%s", media_string(drive));
 738         add_uevent_var(env, "DRIVENAME=%s", drive->name);
 739         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
 740         return 0;
 741 }
 742
 743 static int generic_ide_probe(struct device *dev)
 744 {
 745         ide_drive_t *drive = to_ide_device(dev);
 746         ide_driver_t *drv = to_ide_driver(dev->driver);
 747
 748         return drv->probe ? drv->probe(drive) : -ENODEV;
 749 }
 750
 751 static int generic_ide_remove(struct device *dev)
 752 {
 753         ide_drive_t *drive = to_ide_device(dev);
 754         ide_driver_t *drv = to_ide_driver(dev->driver);
 755
 756         if (drv->remove)
 757                 drv->remove(drive);
 758
 759         return 0;
 760 }
 761
 762 static void generic_ide_shutdown(struct device *dev)
 763 {
 764         ide_drive_t *drive = to_ide_device(dev);
 765         ide_driver_t *drv = to_ide_driver(dev->driver);
 766
 767         if (dev->driver && drv->shutdown)
 768                 drv->shutdown(drive);
 769 }
 770
 771 struct bus_type ide_bus_type = {
 772         .name           = "ide",
 773         .match          = ide_bus_match,
 774         .uevent         = ide_uevent,
 775         .probe          = generic_ide_probe,
 776         .remove         = generic_ide_remove,
 777         .shutdown       = generic_ide_shutdown,
 778         .dev_attrs      = ide_dev_attrs,
 779         .suspend        = generic_ide_suspend,
 780         .resume         = generic_ide_resume,
 781 };
 782
 783 EXPORT_SYMBOL_GPL(ide_bus_type);
 784
 785 int ide_vlb_clk;
 786 EXPORT_SYMBOL_GPL(ide_vlb_clk);
 787
 788 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
 789 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
 790
 791 int ide_pci_clk;
 792 EXPORT_SYMBOL_GPL(ide_pci_clk);
 793
 794 module_param_named(pci_clock, ide_pci_clk, int, 0);
 795 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
 796
 797 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
 798 {
 799         int a, b, i, j = 1;
 800         unsigned int *dev_param_mask = (unsigned int *)kp->arg;
 801
 802         if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
 803             sscanf(s, "%d.%d", &a, &b) != 2)
 804                 return -EINVAL;
 805
 806         i = a * MAX_DRIVES + b;
 807
 808         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 809                 return -EINVAL;
 810
 811         if (j)
 812                 *dev_param_mask |= (1 << i);
 813         else
 814                 *dev_param_mask &= (1 << i);
 815
 816         return 0;
 817 }
 818
 819 static unsigned int ide_nodma;
 820
 821 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
 822 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
 823
 824 static unsigned int ide_noflush;
 825
 826 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
 827 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
 828
 829 static unsigned int ide_noprobe;
 830
 831 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
 832 MODULE_PARM_DESC(noprobe, "skip probing for a device");
 833
 834 static unsigned int ide_nowerr;
 835
 836 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
 837 MODULE_PARM_DESC(nowerr, "ignore the WRERR_STAT bit for a device");
 838
 839 static unsigned int ide_cdroms;
 840
 841 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
 842 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
 843
 844 struct chs_geom {
 845         unsigned int    cyl;
 846         u8              head;
 847         u8              sect;
 848 };
 849
 850 static unsigned int ide_disks;
 851 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
 852
 853 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
 854 {
 855         int a, b, c = 0, h = 0, s = 0, i, j = 1;
 856
 857         if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
 858             sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
 859                 return -EINVAL;
 860
 861         i = a * MAX_DRIVES + b;
 862
 863         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 864                 return -EINVAL;
 865
 866         if (c > INT_MAX || h > 255 || s > 255)
 867                 return -EINVAL;
 868
 869         if (j)
 870                 ide_disks |= (1 << i);
 871         else
 872                 ide_disks &= (1 << i);
 873
 874         ide_disks_chs[i].cyl  = c;
 875         ide_disks_chs[i].head = h;
 876         ide_disks_chs[i].sect = s;
 877
 878         return 0;
 879 }
 880
 881 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
 882 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
 883
 884 static void ide_dev_apply_params(ide_drive_t *drive)
 885 {
 886         int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;
 887
 888         if (ide_nodma & (1 << i)) {
 889                 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
 890                 drive->nodma = 1;
 891         }
 892         if (ide_noflush & (1 << i)) {
 893                 printk(KERN_INFO "ide: disabling flush requests for %s\n",
 894                                  drive->name);
 895                 drive->noflush = 1;
 896         }
 897         if (ide_noprobe & (1 << i)) {
 898                 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
 899                 drive->noprobe = 1;
 900         }
 901         if (ide_nowerr & (1 << i)) {
 902                 printk(KERN_INFO "ide: ignoring the WRERR_STAT bit for %s\n",
 903                                  drive->name);
 904                 drive->bad_wstat = BAD_R_STAT;
 905         }
 906         if (ide_cdroms & (1 << i)) {
 907                 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
 908                 drive->present = 1;
 909                 drive->media = ide_cdrom;
 910                 /* an ATAPI device ignores DRDY */
 911                 drive->ready_stat = 0;
 912         }
 913         if (ide_disks & (1 << i)) {
 914                 drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
 915                 drive->head = drive->bios_head = ide_disks_chs[i].head;
 916                 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
 917                 drive->forced_geom = 1;
 918                 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
 919                                  drive->name,
 920                                  drive->cyl, drive->head, drive->sect);
 921                 drive->present = 1;
 922                 drive->media = ide_disk;
 923                 drive->ready_stat = READY_STAT;
 924         }
 925 }
 926
 927 static unsigned int ide_ignore_cable;
 928
 929 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
 930 {
 931         int i, j = 1;
 932
 933         if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
 934                 return -EINVAL;
 935
 936         if (i >= MAX_HWIFS || j < 0 || j > 1)
 937                 return -EINVAL;
 938
 939         if (j)
 940                 ide_ignore_cable |= (1 << i);
 941         else
 942                 ide_ignore_cable &= (1 << i);
 943
 944         return 0;
 945 }
 946
 947 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
 948 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
 949
 950 void ide_port_apply_params(ide_hwif_t *hwif)
 951 {
 952         int i;
 953
 954         if (ide_ignore_cable & (1 << hwif->index)) {
 955                 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
 956                                  hwif->name);
 957                 hwif->cbl = ATA_CBL_PATA40_SHORT;
 958         }
 959
 960         for (i = 0; i < MAX_DRIVES; i++)
 961                 ide_dev_apply_params(&hwif->drives[i]);
 962 }
 963
 964 /*
 965  * This is gets invoked once during initialization, to set *everything* up
 966  */
 967 static int __init ide_init(void)
 968 {
 969         int ret;
 970
 971         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
 972
 973         ret = bus_register(&ide_bus_type);
 974         if (ret < 0) {
 975                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
 976                 return ret;
 977         }
 978
 979         ide_port_class = class_create(THIS_MODULE, "ide_port");
 980         if (IS_ERR(ide_port_class)) {
 981                 ret = PTR_ERR(ide_port_class);
 982                 goto out_port_class;
 983         }
 984
 985         proc_ide_create();
 986
 987         return 0;
 988
 989 out_port_class:
 990         bus_unregister(&ide_bus_type);
 991
 992         return ret;
 993 }
 994
 995 static void __exit ide_exit(void)
 996 {
 997         proc_ide_destroy();
 998
 999         class_destroy(ide_port_class);
1000
1001         bus_unregister(&ide_bus_type);
1002 }
1003
1004 module_init(ide_init);
1005 module_exit(ide_exit);
1006
1007 MODULE_LICENSE("GPL");