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         default_hwif_iops(hwif);
 105         default_hwif_transport(hwif);
 106
 107         ide_port_init_devices_data(hwif);
 108 }
 109
 110 static void ide_port_init_devices_data(ide_hwif_t *hwif)
 111 {
 112         int unit;
 113
 114         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 115                 ide_drive_t *drive = &hwif->drives[unit];
 116                 u8 j = (hwif->index * MAX_DRIVES) + unit;
 117
 118                 memset(drive, 0, sizeof(*drive));
 119
 120                 drive->media                    = ide_disk;
 121                 drive->select.all               = (unit<<4)|0xa0;
 122                 drive->hwif                     = hwif;
 123                 drive->ready_stat               = READY_STAT;
 124                 drive->bad_wstat                = BAD_W_STAT;
 125                 drive->special.b.recalibrate    = 1;
 126                 drive->special.b.set_geometry   = 1;
 127                 drive->name[0]                  = 'h';
 128                 drive->name[1]                  = 'd';
 129                 drive->name[2]                  = 'a' + j;
 130                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
 131
 132                 INIT_LIST_HEAD(&drive->list);
 133                 init_completion(&drive->gendev_rel_comp);
 134         }
 135 }
 136
 137 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
 138 {
 139         ide_hwgroup_t *hwgroup = hwif->hwgroup;
 140
 141         spin_lock_irq(&ide_lock);
 142         /*
 143          * Remove us from the hwgroup, and free
 144          * the hwgroup if we were the only member
 145          */
 146         if (hwif->next == hwif) {
 147                 BUG_ON(hwgroup->hwif != hwif);
 148                 kfree(hwgroup);
 149         } else {
 150                 /* There is another interface in hwgroup.
 151                  * Unlink us, and set hwgroup->drive and ->hwif to
 152                  * something sane.
 153                  */
 154                 ide_hwif_t *g = hwgroup->hwif;
 155
 156                 while (g->next != hwif)
 157                         g = g->next;
 158                 g->next = hwif->next;
 159                 if (hwgroup->hwif == hwif) {
 160                         /* Chose a random hwif for hwgroup->hwif.
 161                          * It's guaranteed that there are no drives
 162                          * left in the hwgroup.
 163                          */
 164                         BUG_ON(hwgroup->drive != NULL);
 165                         hwgroup->hwif = g;
 166                 }
 167                 BUG_ON(hwgroup->hwif == hwif);
 168         }
 169         spin_unlock_irq(&ide_lock);
 170 }
 171
 172 /* Called with ide_lock held. */
 173 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
 174 {
 175         int i;
 176
 177         for (i = 0; i < MAX_DRIVES; i++) {
 178                 ide_drive_t *drive = &hwif->drives[i];
 179
 180                 if (drive->present) {
 181                         spin_unlock_irq(&ide_lock);
 182                         device_unregister(&drive->gendev);
 183                         wait_for_completion(&drive->gendev_rel_comp);
 184                         spin_lock_irq(&ide_lock);
 185                 }
 186         }
 187 }
 188
 189 void ide_port_unregister_devices(ide_hwif_t *hwif)
 190 {
 191         mutex_lock(&ide_cfg_mtx);
 192         spin_lock_irq(&ide_lock);
 193         __ide_port_unregister_devices(hwif);
 194         hwif->present = 0;
 195         ide_port_init_devices_data(hwif);
 196         spin_unlock_irq(&ide_lock);
 197         mutex_unlock(&ide_cfg_mtx);
 198 }
 199 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
 200
 201 /**
 202  *      ide_unregister          -       free an IDE interface
 203  *      @hwif: IDE interface
 204  *
 205  *      Perform the final unregister of an IDE interface. At the moment
 206  *      we don't refcount interfaces so this will also get split up.
 207  *
 208  *      Locking:
 209  *      The caller must not hold the IDE locks
 210  *      The drive present/vanishing is not yet properly locked
 211  *      Take care with the callbacks. These have been split to avoid
 212  *      deadlocking the IDE layer. The shutdown callback is called
 213  *      before we take the lock and free resources. It is up to the
 214  *      caller to be sure there is no pending I/O here, and that
 215  *      the interface will not be reopened (present/vanishing locking
 216  *      isn't yet done BTW). After we commit to the final kill we
 217  *      call the cleanup callback with the ide locks held.
 218  *
 219  *      Unregister restores the hwif structures to the default state.
 220  *      This is raving bonkers.
 221  */
 222
 223 void ide_unregister(ide_hwif_t *hwif)
 224 {
 225         ide_hwif_t *g;
 226         ide_hwgroup_t *hwgroup;
 227         int irq_count = 0;
 228
 229         BUG_ON(in_interrupt());
 230         BUG_ON(irqs_disabled());
 231
 232         mutex_lock(&ide_cfg_mtx);
 233
 234         spin_lock_irq(&ide_lock);
 235         if (hwif->present) {
 236                 __ide_port_unregister_devices(hwif);
 237                 hwif->present = 0;
 238         }
 239         spin_unlock_irq(&ide_lock);
 240
 241         ide_proc_unregister_port(hwif);
 242
 243         hwgroup = hwif->hwgroup;
 244         /*
 245          * free the irq if we were the only hwif using it
 246          */
 247         g = hwgroup->hwif;
 248         do {
 249                 if (g->irq == hwif->irq)
 250                         ++irq_count;
 251                 g = g->next;
 252         } while (g != hwgroup->hwif);
 253         if (irq_count == 1)
 254                 free_irq(hwif->irq, hwgroup);
 255
 256         ide_remove_port_from_hwgroup(hwif);
 257
 258         device_unregister(hwif->portdev);
 259         device_unregister(&hwif->gendev);
 260         wait_for_completion(&hwif->gendev_rel_comp);
 261
 262         /*
 263          * Remove us from the kernel's knowledge
 264          */
 265         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 266         kfree(hwif->sg_table);
 267         unregister_blkdev(hwif->major, hwif->name);
 268
 269         if (hwif->dma_base)
 270                 ide_release_dma_engine(hwif);
 271
 272         spin_lock_irq(&ide_lock);
 273         /* restore hwif data to pristine status */
 274         ide_init_port_data(hwif, hwif->index);
 275         spin_unlock_irq(&ide_lock);
 276
 277         mutex_unlock(&ide_cfg_mtx);
 278 }
 279
 280 EXPORT_SYMBOL(ide_unregister);
 281
 282 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
 283 {
 284         memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
 285         hwif->irq = hw->irq;
 286         hwif->chipset = hw->chipset;
 287         hwif->dev = hw->dev;
 288         hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
 289         hwif->ack_intr = hw->ack_intr;
 290 }
 291 EXPORT_SYMBOL_GPL(ide_init_port_hw);
 292
 293 /*
 294  *      Locks for IDE setting functionality
 295  */
 296
 297 DEFINE_MUTEX(ide_setting_mtx);
 298
 299 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 300
 301 /**
 302  *      ide_spin_wait_hwgroup   -       wait for group
 303  *      @drive: drive in the group
 304  *
 305  *      Wait for an IDE device group to go non busy and then return
 306  *      holding the ide_lock which guards the hwgroup->busy status
 307  *      and right to use it.
 308  */
 309
 310 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 311 {
 312         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 313         unsigned long timeout = jiffies + (3 * HZ);
 314
 315         spin_lock_irq(&ide_lock);
 316
 317         while (hwgroup->busy) {
 318                 unsigned long lflags;
 319                 spin_unlock_irq(&ide_lock);
 320                 local_irq_set(lflags);
 321                 if (time_after(jiffies, timeout)) {
 322                         local_irq_restore(lflags);
 323                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 324                         return -EBUSY;
 325                 }
 326                 local_irq_restore(lflags);
 327                 spin_lock_irq(&ide_lock);
 328         }
 329         return 0;
 330 }
 331
 332 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 333
 334 int set_io_32bit(ide_drive_t *drive, int arg)
 335 {
 336         if (drive->no_io_32bit)
 337                 return -EPERM;
 338
 339         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 340                 return -EINVAL;
 341
 342         if (ide_spin_wait_hwgroup(drive))
 343                 return -EBUSY;
 344
 345         drive->io_32bit = arg;
 346
 347         spin_unlock_irq(&ide_lock);
 348
 349         return 0;
 350 }
 351
 352 static int set_ksettings(ide_drive_t *drive, int arg)
 353 {
 354         if (arg < 0 || arg > 1)
 355                 return -EINVAL;
 356
 357         if (ide_spin_wait_hwgroup(drive))
 358                 return -EBUSY;
 359         drive->keep_settings = arg;
 360         spin_unlock_irq(&ide_lock);
 361
 362         return 0;
 363 }
 364
 365 int set_using_dma(ide_drive_t *drive, int arg)
 366 {
 367 #ifdef CONFIG_BLK_DEV_IDEDMA
 368         ide_hwif_t *hwif = drive->hwif;
 369         int err = -EPERM;
 370
 371         if (arg < 0 || arg > 1)
 372                 return -EINVAL;
 373
 374         if (!drive->id || !(drive->id->capability & 1))
 375                 goto out;
 376
 377         if (hwif->dma_ops == NULL)
 378                 goto out;
 379
 380         err = -EBUSY;
 381         if (ide_spin_wait_hwgroup(drive))
 382                 goto out;
 383         /*
 384          * set ->busy flag, unlock and let it ride
 385          */
 386         hwif->hwgroup->busy = 1;
 387         spin_unlock_irq(&ide_lock);
 388
 389         err = 0;
 390
 391         if (arg) {
 392                 if (ide_set_dma(drive))
 393                         err = -EIO;
 394         } else
 395                 ide_dma_off(drive);
 396
 397         /*
 398          * lock, clear ->busy flag and unlock before leaving
 399          */
 400         spin_lock_irq(&ide_lock);
 401         hwif->hwgroup->busy = 0;
 402         spin_unlock_irq(&ide_lock);
 403 out:
 404         return err;
 405 #else
 406         if (arg < 0 || arg > 1)
 407                 return -EINVAL;
 408
 409         return -EPERM;
 410 #endif
 411 }
 412
 413 int set_pio_mode(ide_drive_t *drive, int arg)
 414 {
 415         struct request *rq;
 416         ide_hwif_t *hwif = drive->hwif;
 417         const struct ide_port_ops *port_ops = hwif->port_ops;
 418
 419         if (arg < 0 || arg > 255)
 420                 return -EINVAL;
 421
 422         if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
 423             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
 424                 return -ENOSYS;
 425
 426         if (drive->special.b.set_tune)
 427                 return -EBUSY;
 428
 429         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 430         rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
 431
 432         drive->tune_req = (u8) arg;
 433         drive->special.b.set_tune = 1;
 434
 435         blk_execute_rq(drive->queue, NULL, rq, 0);
 436         blk_put_request(rq);
 437
 438         return 0;
 439 }
 440
 441 static int set_unmaskirq(ide_drive_t *drive, int arg)
 442 {
 443         if (drive->no_unmask)
 444                 return -EPERM;
 445
 446         if (arg < 0 || arg > 1)
 447                 return -EINVAL;
 448
 449         if (ide_spin_wait_hwgroup(drive))
 450                 return -EBUSY;
 451         drive->unmask = arg;
 452         spin_unlock_irq(&ide_lock);
 453
 454         return 0;
 455 }
 456
 457 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 458 {
 459         ide_drive_t *drive = dev->driver_data;
 460         ide_hwif_t *hwif = HWIF(drive);
 461         struct request *rq;
 462         struct request_pm_state rqpm;
 463         ide_task_t args;
 464         int ret;
 465
 466         /* Call ACPI _GTM only once */
 467         if (!(drive->dn % 2))
 468                 ide_acpi_get_timing(hwif);
 469
 470         memset(&rqpm, 0, sizeof(rqpm));
 471         memset(&args, 0, sizeof(args));
 472         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 473         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
 474         rq->special = &args;
 475         rq->data = &rqpm;
 476         rqpm.pm_step = ide_pm_state_start_suspend;
 477         if (mesg.event == PM_EVENT_PRETHAW)
 478                 mesg.event = PM_EVENT_FREEZE;
 479         rqpm.pm_state = mesg.event;
 480
 481         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
 482         blk_put_request(rq);
 483         /* only call ACPI _PS3 after both drivers are suspended */
 484         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 485                  && hwif->drives[1].present)
 486                  || !hwif->drives[0].present
 487                  || !hwif->drives[1].present))
 488                 ide_acpi_set_state(hwif, 0);
 489         return ret;
 490 }
 491
 492 static int generic_ide_resume(struct device *dev)
 493 {
 494         ide_drive_t *drive = dev->driver_data;
 495         ide_hwif_t *hwif = HWIF(drive);
 496         struct request *rq;
 497         struct request_pm_state rqpm;
 498         ide_task_t args;
 499         int err;
 500
 501         /* Call ACPI _STM only once */
 502         if (!(drive->dn % 2)) {
 503                 ide_acpi_set_state(hwif, 1);
 504                 ide_acpi_push_timing(hwif);
 505         }
 506
 507         ide_acpi_exec_tfs(drive);
 508
 509         memset(&rqpm, 0, sizeof(rqpm));
 510         memset(&args, 0, sizeof(args));
 511         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 512         rq->cmd_type = REQ_TYPE_PM_RESUME;
 513         rq->cmd_flags |= REQ_PREEMPT;
 514         rq->special = &args;
 515         rq->data = &rqpm;
 516         rqpm.pm_step = ide_pm_state_start_resume;
 517         rqpm.pm_state = PM_EVENT_ON;
 518
 519         err = blk_execute_rq(drive->queue, NULL, rq, 1);
 520         blk_put_request(rq);
 521
 522         if (err == 0 && dev->driver) {
 523                 ide_driver_t *drv = to_ide_driver(dev->driver);
 524
 525                 if (drv->resume)
 526                         drv->resume(drive);
 527         }
 528
 529         return err;
 530 }
 531
 532 static void generic_drive_reset(ide_drive_t *drive)
 533 {
 534         struct request *rq;
 535
 536         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 537         rq->cmd_type = REQ_TYPE_SPECIAL;
 538         rq->cmd_len = 1;
 539         rq->cmd[0] = REQ_DRIVE_RESET;
 540         rq->cmd_flags |= REQ_SOFTBARRIER;
 541         blk_execute_rq(drive->queue, NULL, rq, 1);
 542         blk_put_request(rq);
 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                         generic_drive_reset(drive);
 620                         return 0;
 621
 622                 case HDIO_GET_BUSSTATE:
 623                         if (!capable(CAP_SYS_ADMIN))
 624                                 return -EACCES;
 625                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
 626                                 return -EFAULT;
 627                         return 0;
 628
 629                 case HDIO_SET_BUSSTATE:
 630                         if (!capable(CAP_SYS_ADMIN))
 631                                 return -EACCES;
 632                         return -EOPNOTSUPP;
 633                 default:
 634                         return -EINVAL;
 635         }
 636
 637 read_val:
 638         mutex_lock(&ide_setting_mtx);
 639         spin_lock_irqsave(&ide_lock, flags);
 640         err = *val;
 641         spin_unlock_irqrestore(&ide_lock, flags);
 642         mutex_unlock(&ide_setting_mtx);
 643         return err >= 0 ? put_user(err, (long __user *)arg) : err;
 644
 645 set_val:
 646         if (bdev != bdev->bd_contains)
 647                 err = -EINVAL;
 648         else {
 649                 if (!capable(CAP_SYS_ADMIN))
 650                         err = -EACCES;
 651                 else {
 652                         mutex_lock(&ide_setting_mtx);
 653                         err = setfunc(drive, arg);
 654                         mutex_unlock(&ide_setting_mtx);
 655                 }
 656         }
 657         return err;
 658 }
 659
 660 EXPORT_SYMBOL(generic_ide_ioctl);
 661
 662 static int ide_bus_match(struct device *dev, struct device_driver *drv)
 663 {
 664         return 1;
 665 }
 666
 667 static char *media_string(ide_drive_t *drive)
 668 {
 669         switch (drive->media) {
 670         case ide_disk:
 671                 return "disk";
 672         case ide_cdrom:
 673                 return "cdrom";
 674         case ide_tape:
 675                 return "tape";
 676         case ide_floppy:
 677                 return "floppy";
 678         case ide_optical:
 679                 return "optical";
 680         default:
 681                 return "UNKNOWN";
 682         }
 683 }
 684
 685 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
 686 {
 687         ide_drive_t *drive = to_ide_device(dev);
 688         return sprintf(buf, "%s\n", media_string(drive));
 689 }
 690
 691 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
 692 {
 693         ide_drive_t *drive = to_ide_device(dev);
 694         return sprintf(buf, "%s\n", drive->name);
 695 }
 696
 697 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 698 {
 699         ide_drive_t *drive = to_ide_device(dev);
 700         return sprintf(buf, "ide:m-%s\n", media_string(drive));
 701 }
 702
 703 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
 704                           char *buf)
 705 {
 706         ide_drive_t *drive = to_ide_device(dev);
 707         return sprintf(buf, "%s\n", drive->id->model);
 708 }
 709
 710 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
 711                              char *buf)
 712 {
 713         ide_drive_t *drive = to_ide_device(dev);
 714         return sprintf(buf, "%s\n", drive->id->fw_rev);
 715 }
 716
 717 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
 718                            char *buf)
 719 {
 720         ide_drive_t *drive = to_ide_device(dev);
 721         return sprintf(buf, "%s\n", drive->id->serial_no);
 722 }
 723
 724 static struct device_attribute ide_dev_attrs[] = {
 725         __ATTR_RO(media),
 726         __ATTR_RO(drivename),
 727         __ATTR_RO(modalias),
 728         __ATTR_RO(model),
 729         __ATTR_RO(firmware),
 730         __ATTR(serial, 0400, serial_show, NULL),
 731         __ATTR_NULL
 732 };
 733
 734 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
 735 {
 736         ide_drive_t *drive = to_ide_device(dev);
 737
 738         add_uevent_var(env, "MEDIA=%s", media_string(drive));
 739         add_uevent_var(env, "DRIVENAME=%s", drive->name);
 740         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
 741         return 0;
 742 }
 743
 744 static int generic_ide_probe(struct device *dev)
 745 {
 746         ide_drive_t *drive = to_ide_device(dev);
 747         ide_driver_t *drv = to_ide_driver(dev->driver);
 748
 749         return drv->probe ? drv->probe(drive) : -ENODEV;
 750 }
 751
 752 static int generic_ide_remove(struct device *dev)
 753 {
 754         ide_drive_t *drive = to_ide_device(dev);
 755         ide_driver_t *drv = to_ide_driver(dev->driver);
 756
 757         if (drv->remove)
 758                 drv->remove(drive);
 759
 760         return 0;
 761 }
 762
 763 static void generic_ide_shutdown(struct device *dev)
 764 {
 765         ide_drive_t *drive = to_ide_device(dev);
 766         ide_driver_t *drv = to_ide_driver(dev->driver);
 767
 768         if (dev->driver && drv->shutdown)
 769                 drv->shutdown(drive);
 770 }
 771
 772 struct bus_type ide_bus_type = {
 773         .name           = "ide",
 774         .match          = ide_bus_match,
 775         .uevent         = ide_uevent,
 776         .probe          = generic_ide_probe,
 777         .remove         = generic_ide_remove,
 778         .shutdown       = generic_ide_shutdown,
 779         .dev_attrs      = ide_dev_attrs,
 780         .suspend        = generic_ide_suspend,
 781         .resume         = generic_ide_resume,
 782 };
 783
 784 EXPORT_SYMBOL_GPL(ide_bus_type);
 785
 786 int ide_vlb_clk;
 787 EXPORT_SYMBOL_GPL(ide_vlb_clk);
 788
 789 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
 790 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
 791
 792 int ide_pci_clk;
 793 EXPORT_SYMBOL_GPL(ide_pci_clk);
 794
 795 module_param_named(pci_clock, ide_pci_clk, int, 0);
 796 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
 797
 798 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
 799 {
 800         int a, b, i, j = 1;
 801         unsigned int *dev_param_mask = (unsigned int *)kp->arg;
 802
 803         if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
 804             sscanf(s, "%d.%d", &a, &b) != 2)
 805                 return -EINVAL;
 806
 807         i = a * MAX_DRIVES + b;
 808
 809         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 810                 return -EINVAL;
 811
 812         if (j)
 813                 *dev_param_mask |= (1 << i);
 814         else
 815                 *dev_param_mask &= (1 << i);
 816
 817         return 0;
 818 }
 819
 820 static unsigned int ide_nodma;
 821
 822 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
 823 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
 824
 825 static unsigned int ide_noflush;
 826
 827 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
 828 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
 829
 830 static unsigned int ide_noprobe;
 831
 832 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
 833 MODULE_PARM_DESC(noprobe, "skip probing for a device");
 834
 835 static unsigned int ide_nowerr;
 836
 837 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
 838 MODULE_PARM_DESC(nowerr, "ignore the WRERR_STAT bit for a device");
 839
 840 static unsigned int ide_cdroms;
 841
 842 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
 843 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
 844
 845 struct chs_geom {
 846         unsigned int    cyl;
 847         u8              head;
 848         u8              sect;
 849 };
 850
 851 static unsigned int ide_disks;
 852 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
 853
 854 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
 855 {
 856         int a, b, c = 0, h = 0, s = 0, i, j = 1;
 857
 858         if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
 859             sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
 860                 return -EINVAL;
 861
 862         i = a * MAX_DRIVES + b;
 863
 864         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 865                 return -EINVAL;
 866
 867         if (c > INT_MAX || h > 255 || s > 255)
 868                 return -EINVAL;
 869
 870         if (j)
 871                 ide_disks |= (1 << i);
 872         else
 873                 ide_disks &= (1 << i);
 874
 875         ide_disks_chs[i].cyl  = c;
 876         ide_disks_chs[i].head = h;
 877         ide_disks_chs[i].sect = s;
 878
 879         return 0;
 880 }
 881
 882 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
 883 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
 884
 885 static void ide_dev_apply_params(ide_drive_t *drive)
 886 {
 887         int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;
 888
 889         if (ide_nodma & (1 << i)) {
 890                 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
 891                 drive->nodma = 1;
 892         }
 893         if (ide_noflush & (1 << i)) {
 894                 printk(KERN_INFO "ide: disabling flush requests for %s\n",
 895                                  drive->name);
 896                 drive->noflush = 1;
 897         }
 898         if (ide_noprobe & (1 << i)) {
 899                 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
 900                 drive->noprobe = 1;
 901         }
 902         if (ide_nowerr & (1 << i)) {
 903                 printk(KERN_INFO "ide: ignoring the WRERR_STAT bit for %s\n",
 904                                  drive->name);
 905                 drive->bad_wstat = BAD_R_STAT;
 906         }
 907         if (ide_cdroms & (1 << i)) {
 908                 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
 909                 drive->present = 1;
 910                 drive->media = ide_cdrom;
 911                 /* an ATAPI device ignores DRDY */
 912                 drive->ready_stat = 0;
 913         }
 914         if (ide_disks & (1 << i)) {
 915                 drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
 916                 drive->head = drive->bios_head = ide_disks_chs[i].head;
 917                 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
 918                 drive->forced_geom = 1;
 919                 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
 920                                  drive->name,
 921                                  drive->cyl, drive->head, drive->sect);
 922                 drive->present = 1;
 923                 drive->media = ide_disk;
 924                 drive->ready_stat = READY_STAT;
 925         }
 926 }
 927
 928 static unsigned int ide_ignore_cable;
 929
 930 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
 931 {
 932         int i, j = 1;
 933
 934         if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
 935                 return -EINVAL;
 936
 937         if (i >= MAX_HWIFS || j < 0 || j > 1)
 938                 return -EINVAL;
 939
 940         if (j)
 941                 ide_ignore_cable |= (1 << i);
 942         else
 943                 ide_ignore_cable &= (1 << i);
 944
 945         return 0;
 946 }
 947
 948 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
 949 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
 950
 951 void ide_port_apply_params(ide_hwif_t *hwif)
 952 {
 953         int i;
 954
 955         if (ide_ignore_cable & (1 << hwif->index)) {
 956                 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
 957                                  hwif->name);
 958                 hwif->cbl = ATA_CBL_PATA40_SHORT;
 959         }
 960
 961         for (i = 0; i < MAX_DRIVES; i++)
 962                 ide_dev_apply_params(&hwif->drives[i]);
 963 }
 964
 965 /*
 966  * This is gets invoked once during initialization, to set *everything* up
 967  */
 968 static int __init ide_init(void)
 969 {
 970         int ret;
 971
 972         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
 973
 974         ret = bus_register(&ide_bus_type);
 975         if (ret < 0) {
 976                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
 977                 return ret;
 978         }
 979
 980         ide_port_class = class_create(THIS_MODULE, "ide_port");
 981         if (IS_ERR(ide_port_class)) {
 982                 ret = PTR_ERR(ide_port_class);
 983                 goto out_port_class;
 984         }
 985
 986         proc_ide_create();
 987
 988         return 0;
 989
 990 out_port_class:
 991         bus_unregister(&ide_bus_type);
 992
 993         return ret;
 994 }
 995
 996 static void __exit ide_exit(void)
 997 {
 998         proc_ide_destroy();
 999
1000         class_destroy(ide_port_class);
1001
1002         bus_unregister(&ide_bus_type);
1003 }
1004
1005 module_init(ide_init);
1006 module_exit(ide_exit);
1007
1008 MODULE_LICENSE("GPL");