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         default_hwif_transport(hwif);
 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 EXPORT_SYMBOL(ide_unregister);
 280
 281 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
 282 {
 283         memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
 284         hwif->irq = hw->irq;
 285         hwif->chipset = hw->chipset;
 286         hwif->dev = hw->dev;
 287         hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
 288         hwif->ack_intr = hw->ack_intr;
 289         hwif->config_data = hw->config;
 290 }
 291
 292 /*
 293  *      Locks for IDE setting functionality
 294  */
 295
 296 DEFINE_MUTEX(ide_setting_mtx);
 297
 298 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 299
 300 /**
 301  *      ide_spin_wait_hwgroup   -       wait for group
 302  *      @drive: drive in the group
 303  *
 304  *      Wait for an IDE device group to go non busy and then return
 305  *      holding the ide_lock which guards the hwgroup->busy status
 306  *      and right to use it.
 307  */
 308
 309 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 310 {
 311         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 312         unsigned long timeout = jiffies + (3 * HZ);
 313
 314         spin_lock_irq(&ide_lock);
 315
 316         while (hwgroup->busy) {
 317                 unsigned long lflags;
 318                 spin_unlock_irq(&ide_lock);
 319                 local_irq_set(lflags);
 320                 if (time_after(jiffies, timeout)) {
 321                         local_irq_restore(lflags);
 322                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 323                         return -EBUSY;
 324                 }
 325                 local_irq_restore(lflags);
 326                 spin_lock_irq(&ide_lock);
 327         }
 328         return 0;
 329 }
 330
 331 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 332
 333 int set_io_32bit(ide_drive_t *drive, int arg)
 334 {
 335         if (drive->no_io_32bit)
 336                 return -EPERM;
 337
 338         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 339                 return -EINVAL;
 340
 341         if (ide_spin_wait_hwgroup(drive))
 342                 return -EBUSY;
 343
 344         drive->io_32bit = arg;
 345
 346         spin_unlock_irq(&ide_lock);
 347
 348         return 0;
 349 }
 350
 351 static int set_ksettings(ide_drive_t *drive, int arg)
 352 {
 353         if (arg < 0 || arg > 1)
 354                 return -EINVAL;
 355
 356         if (ide_spin_wait_hwgroup(drive))
 357                 return -EBUSY;
 358         drive->keep_settings = arg;
 359         spin_unlock_irq(&ide_lock);
 360
 361         return 0;
 362 }
 363
 364 int set_using_dma(ide_drive_t *drive, int arg)
 365 {
 366 #ifdef CONFIG_BLK_DEV_IDEDMA
 367         ide_hwif_t *hwif = drive->hwif;
 368         int err = -EPERM;
 369
 370         if (arg < 0 || arg > 1)
 371                 return -EINVAL;
 372
 373         if (!drive->id || !(drive->id->capability & 1))
 374                 goto out;
 375
 376         if (hwif->dma_ops == NULL)
 377                 goto out;
 378
 379         err = -EBUSY;
 380         if (ide_spin_wait_hwgroup(drive))
 381                 goto out;
 382         /*
 383          * set ->busy flag, unlock and let it ride
 384          */
 385         hwif->hwgroup->busy = 1;
 386         spin_unlock_irq(&ide_lock);
 387
 388         err = 0;
 389
 390         if (arg) {
 391                 if (ide_set_dma(drive))
 392                         err = -EIO;
 393         } else
 394                 ide_dma_off(drive);
 395
 396         /*
 397          * lock, clear ->busy flag and unlock before leaving
 398          */
 399         spin_lock_irq(&ide_lock);
 400         hwif->hwgroup->busy = 0;
 401         spin_unlock_irq(&ide_lock);
 402 out:
 403         return err;
 404 #else
 405         if (arg < 0 || arg > 1)
 406                 return -EINVAL;
 407
 408         return -EPERM;
 409 #endif
 410 }
 411
 412 int set_pio_mode(ide_drive_t *drive, int arg)
 413 {
 414         struct request *rq;
 415         ide_hwif_t *hwif = drive->hwif;
 416         const struct ide_port_ops *port_ops = hwif->port_ops;
 417
 418         if (arg < 0 || arg > 255)
 419                 return -EINVAL;
 420
 421         if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
 422             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
 423                 return -ENOSYS;
 424
 425         if (drive->special.b.set_tune)
 426                 return -EBUSY;
 427
 428         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 429         rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
 430
 431         drive->tune_req = (u8) arg;
 432         drive->special.b.set_tune = 1;
 433
 434         blk_execute_rq(drive->queue, NULL, rq, 0);
 435         blk_put_request(rq);
 436
 437         return 0;
 438 }
 439
 440 static int set_unmaskirq(ide_drive_t *drive, int arg)
 441 {
 442         if (drive->no_unmask)
 443                 return -EPERM;
 444
 445         if (arg < 0 || arg > 1)
 446                 return -EINVAL;
 447
 448         if (ide_spin_wait_hwgroup(drive))
 449                 return -EBUSY;
 450         drive->unmask = arg;
 451         spin_unlock_irq(&ide_lock);
 452
 453         return 0;
 454 }
 455
 456 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 457 {
 458         ide_drive_t *drive = dev->driver_data;
 459         ide_hwif_t *hwif = HWIF(drive);
 460         struct request *rq;
 461         struct request_pm_state rqpm;
 462         ide_task_t args;
 463         int ret;
 464
 465         /* Call ACPI _GTM only once */
 466         if (!(drive->dn % 2))
 467                 ide_acpi_get_timing(hwif);
 468
 469         memset(&rqpm, 0, sizeof(rqpm));
 470         memset(&args, 0, sizeof(args));
 471         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 472         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
 473         rq->special = &args;
 474         rq->data = &rqpm;
 475         rqpm.pm_step = ide_pm_state_start_suspend;
 476         if (mesg.event == PM_EVENT_PRETHAW)
 477                 mesg.event = PM_EVENT_FREEZE;
 478         rqpm.pm_state = mesg.event;
 479
 480         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
 481         blk_put_request(rq);
 482         /* only call ACPI _PS3 after both drivers are suspended */
 483         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 484                  && hwif->drives[1].present)
 485                  || !hwif->drives[0].present
 486                  || !hwif->drives[1].present))
 487                 ide_acpi_set_state(hwif, 0);
 488         return ret;
 489 }
 490
 491 static int generic_ide_resume(struct device *dev)
 492 {
 493         ide_drive_t *drive = dev->driver_data;
 494         ide_hwif_t *hwif = HWIF(drive);
 495         struct request *rq;
 496         struct request_pm_state rqpm;
 497         ide_task_t args;
 498         int err;
 499
 500         /* Call ACPI _STM only once */
 501         if (!(drive->dn % 2)) {
 502                 ide_acpi_set_state(hwif, 1);
 503                 ide_acpi_push_timing(hwif);
 504         }
 505
 506         ide_acpi_exec_tfs(drive);
 507
 508         memset(&rqpm, 0, sizeof(rqpm));
 509         memset(&args, 0, sizeof(args));
 510         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 511         rq->cmd_type = REQ_TYPE_PM_RESUME;
 512         rq->cmd_flags |= REQ_PREEMPT;
 513         rq->special = &args;
 514         rq->data = &rqpm;
 515         rqpm.pm_step = ide_pm_state_start_resume;
 516         rqpm.pm_state = PM_EVENT_ON;
 517
 518         err = blk_execute_rq(drive->queue, NULL, rq, 1);
 519         blk_put_request(rq);
 520
 521         if (err == 0 && dev->driver) {
 522                 ide_driver_t *drv = to_ide_driver(dev->driver);
 523
 524                 if (drv->resume)
 525                         drv->resume(drive);
 526         }
 527
 528         return err;
 529 }
 530
 531 static int generic_drive_reset(ide_drive_t *drive)
 532 {
 533         struct request *rq;
 534         int ret = 0;
 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         if (blk_execute_rq(drive->queue, NULL, rq, 1))
 542                 ret = rq->errors;
 543         blk_put_request(rq);
 544         return ret;
 545 }
 546
 547 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 548                         unsigned int cmd, unsigned long arg)
 549 {
 550         unsigned long flags;
 551         ide_driver_t *drv;
 552         void __user *p = (void __user *)arg;
 553         int err = 0, (*setfunc)(ide_drive_t *, int);
 554         u8 *val;
 555
 556         switch (cmd) {
 557         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
 558         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
 559         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
 560         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
 561         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
 562         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
 563         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
 564         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
 565         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
 566         }
 567
 568         switch (cmd) {
 569                 case HDIO_OBSOLETE_IDENTITY:
 570                 case HDIO_GET_IDENTITY:
 571                         if (bdev != bdev->bd_contains)
 572                                 return -EINVAL;
 573                         if (drive->id_read == 0)
 574                                 return -ENOMSG;
 575                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
 576                                 return -EFAULT;
 577                         return 0;
 578
 579                 case HDIO_GET_NICE:
 580                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
 581                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
 582                                         drive->nice1 << IDE_NICE_1,
 583                                         (long __user *) arg);
 584 #ifdef CONFIG_IDE_TASK_IOCTL
 585                 case HDIO_DRIVE_TASKFILE:
 586                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 587                                 return -EACCES;
 588                         switch(drive->media) {
 589                                 case ide_disk:
 590                                         return ide_taskfile_ioctl(drive, cmd, arg);
 591                                 default:
 592                                         return -ENOMSG;
 593                         }
 594 #endif /* CONFIG_IDE_TASK_IOCTL */
 595
 596                 case HDIO_DRIVE_CMD:
 597                         if (!capable(CAP_SYS_RAWIO))
 598                                 return -EACCES;
 599                         return ide_cmd_ioctl(drive, cmd, arg);
 600
 601                 case HDIO_DRIVE_TASK:
 602                         if (!capable(CAP_SYS_RAWIO))
 603                                 return -EACCES;
 604                         return ide_task_ioctl(drive, cmd, arg);
 605                 case HDIO_SET_NICE:
 606                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
 607                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
 608                                 return -EPERM;
 609                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
 610                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
 611                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
 612                                 drive->dsc_overlap = 0;
 613                                 return -EPERM;
 614                         }
 615                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
 616                         return 0;
 617                 case HDIO_DRIVE_RESET:
 618                         if (!capable(CAP_SYS_ADMIN))
 619                                 return -EACCES;
 620
 621                         return generic_drive_reset(drive);
 622
 623                 case HDIO_GET_BUSSTATE:
 624                         if (!capable(CAP_SYS_ADMIN))
 625                                 return -EACCES;
 626                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
 627                                 return -EFAULT;
 628                         return 0;
 629
 630                 case HDIO_SET_BUSSTATE:
 631                         if (!capable(CAP_SYS_ADMIN))
 632                                 return -EACCES;
 633                         return -EOPNOTSUPP;
 634                 default:
 635                         return -EINVAL;
 636         }
 637
 638 read_val:
 639         mutex_lock(&ide_setting_mtx);
 640         spin_lock_irqsave(&ide_lock, flags);
 641         err = *val;
 642         spin_unlock_irqrestore(&ide_lock, flags);
 643         mutex_unlock(&ide_setting_mtx);
 644         return err >= 0 ? put_user(err, (long __user *)arg) : err;
 645
 646 set_val:
 647         if (bdev != bdev->bd_contains)
 648                 err = -EINVAL;
 649         else {
 650                 if (!capable(CAP_SYS_ADMIN))
 651                         err = -EACCES;
 652                 else {
 653                         mutex_lock(&ide_setting_mtx);
 654                         err = setfunc(drive, arg);
 655                         mutex_unlock(&ide_setting_mtx);
 656                 }
 657         }
 658         return err;
 659 }
 660
 661 EXPORT_SYMBOL(generic_ide_ioctl);
 662
 663 static int ide_bus_match(struct device *dev, struct device_driver *drv)
 664 {
 665         return 1;
 666 }
 667
 668 static char *media_string(ide_drive_t *drive)
 669 {
 670         switch (drive->media) {
 671         case ide_disk:
 672                 return "disk";
 673         case ide_cdrom:
 674                 return "cdrom";
 675         case ide_tape:
 676                 return "tape";
 677         case ide_floppy:
 678                 return "floppy";
 679         case ide_optical:
 680                 return "optical";
 681         default:
 682                 return "UNKNOWN";
 683         }
 684 }
 685
 686 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
 687 {
 688         ide_drive_t *drive = to_ide_device(dev);
 689         return sprintf(buf, "%s\n", media_string(drive));
 690 }
 691
 692 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
 693 {
 694         ide_drive_t *drive = to_ide_device(dev);
 695         return sprintf(buf, "%s\n", drive->name);
 696 }
 697
 698 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 699 {
 700         ide_drive_t *drive = to_ide_device(dev);
 701         return sprintf(buf, "ide:m-%s\n", media_string(drive));
 702 }
 703
 704 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
 705                           char *buf)
 706 {
 707         ide_drive_t *drive = to_ide_device(dev);
 708         return sprintf(buf, "%s\n", drive->id->model);
 709 }
 710
 711 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
 712                              char *buf)
 713 {
 714         ide_drive_t *drive = to_ide_device(dev);
 715         return sprintf(buf, "%s\n", drive->id->fw_rev);
 716 }
 717
 718 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
 719                            char *buf)
 720 {
 721         ide_drive_t *drive = to_ide_device(dev);
 722         return sprintf(buf, "%s\n", drive->id->serial_no);
 723 }
 724
 725 static struct device_attribute ide_dev_attrs[] = {
 726         __ATTR_RO(media),
 727         __ATTR_RO(drivename),
 728         __ATTR_RO(modalias),
 729         __ATTR_RO(model),
 730         __ATTR_RO(firmware),
 731         __ATTR(serial, 0400, serial_show, NULL),
 732         __ATTR_NULL
 733 };
 734
 735 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
 736 {
 737         ide_drive_t *drive = to_ide_device(dev);
 738
 739         add_uevent_var(env, "MEDIA=%s", media_string(drive));
 740         add_uevent_var(env, "DRIVENAME=%s", drive->name);
 741         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
 742         return 0;
 743 }
 744
 745 static int generic_ide_probe(struct device *dev)
 746 {
 747         ide_drive_t *drive = to_ide_device(dev);
 748         ide_driver_t *drv = to_ide_driver(dev->driver);
 749
 750         return drv->probe ? drv->probe(drive) : -ENODEV;
 751 }
 752
 753 static int generic_ide_remove(struct device *dev)
 754 {
 755         ide_drive_t *drive = to_ide_device(dev);
 756         ide_driver_t *drv = to_ide_driver(dev->driver);
 757
 758         if (drv->remove)
 759                 drv->remove(drive);
 760
 761         return 0;
 762 }
 763
 764 static void generic_ide_shutdown(struct device *dev)
 765 {
 766         ide_drive_t *drive = to_ide_device(dev);
 767         ide_driver_t *drv = to_ide_driver(dev->driver);
 768
 769         if (dev->driver && drv->shutdown)
 770                 drv->shutdown(drive);
 771 }
 772
 773 struct bus_type ide_bus_type = {
 774         .name           = "ide",
 775         .match          = ide_bus_match,
 776         .uevent         = ide_uevent,
 777         .probe          = generic_ide_probe,
 778         .remove         = generic_ide_remove,
 779         .shutdown       = generic_ide_shutdown,
 780         .dev_attrs      = ide_dev_attrs,
 781         .suspend        = generic_ide_suspend,
 782         .resume         = generic_ide_resume,
 783 };
 784
 785 EXPORT_SYMBOL_GPL(ide_bus_type);
 786
 787 int ide_vlb_clk;
 788 EXPORT_SYMBOL_GPL(ide_vlb_clk);
 789
 790 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
 791 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
 792
 793 int ide_pci_clk;
 794 EXPORT_SYMBOL_GPL(ide_pci_clk);
 795
 796 module_param_named(pci_clock, ide_pci_clk, int, 0);
 797 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
 798
 799 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
 800 {
 801         int a, b, i, j = 1;
 802         unsigned int *dev_param_mask = (unsigned int *)kp->arg;
 803
 804         if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
 805             sscanf(s, "%d.%d", &a, &b) != 2)
 806                 return -EINVAL;
 807
 808         i = a * MAX_DRIVES + b;
 809
 810         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 811                 return -EINVAL;
 812
 813         if (j)
 814                 *dev_param_mask |= (1 << i);
 815         else
 816                 *dev_param_mask &= (1 << i);
 817
 818         return 0;
 819 }
 820
 821 static unsigned int ide_nodma;
 822
 823 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
 824 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
 825
 826 static unsigned int ide_noflush;
 827
 828 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
 829 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
 830
 831 static unsigned int ide_noprobe;
 832
 833 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
 834 MODULE_PARM_DESC(noprobe, "skip probing for a device");
 835
 836 static unsigned int ide_nowerr;
 837
 838 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
 839 MODULE_PARM_DESC(nowerr, "ignore the WRERR_STAT bit for a device");
 840
 841 static unsigned int ide_cdroms;
 842
 843 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
 844 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
 845
 846 struct chs_geom {
 847         unsigned int    cyl;
 848         u8              head;
 849         u8              sect;
 850 };
 851
 852 static unsigned int ide_disks;
 853 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
 854
 855 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
 856 {
 857         int a, b, c = 0, h = 0, s = 0, i, j = 1;
 858
 859         if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
 860             sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
 861                 return -EINVAL;
 862
 863         i = a * MAX_DRIVES + b;
 864
 865         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 866                 return -EINVAL;
 867
 868         if (c > INT_MAX || h > 255 || s > 255)
 869                 return -EINVAL;
 870
 871         if (j)
 872                 ide_disks |= (1 << i);
 873         else
 874                 ide_disks &= (1 << i);
 875
 876         ide_disks_chs[i].cyl  = c;
 877         ide_disks_chs[i].head = h;
 878         ide_disks_chs[i].sect = s;
 879
 880         return 0;
 881 }
 882
 883 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
 884 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
 885
 886 static void ide_dev_apply_params(ide_drive_t *drive)
 887 {
 888         int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;
 889
 890         if (ide_nodma & (1 << i)) {
 891                 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
 892                 drive->nodma = 1;
 893         }
 894         if (ide_noflush & (1 << i)) {
 895                 printk(KERN_INFO "ide: disabling flush requests for %s\n",
 896                                  drive->name);
 897                 drive->noflush = 1;
 898         }
 899         if (ide_noprobe & (1 << i)) {
 900                 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
 901                 drive->noprobe = 1;
 902         }
 903         if (ide_nowerr & (1 << i)) {
 904                 printk(KERN_INFO "ide: ignoring the WRERR_STAT bit for %s\n",
 905                                  drive->name);
 906                 drive->bad_wstat = BAD_R_STAT;
 907         }
 908         if (ide_cdroms & (1 << i)) {
 909                 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
 910                 drive->present = 1;
 911                 drive->media = ide_cdrom;
 912                 /* an ATAPI device ignores DRDY */
 913                 drive->ready_stat = 0;
 914         }
 915         if (ide_disks & (1 << i)) {
 916                 drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
 917                 drive->head = drive->bios_head = ide_disks_chs[i].head;
 918                 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
 919                 drive->forced_geom = 1;
 920                 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
 921                                  drive->name,
 922                                  drive->cyl, drive->head, drive->sect);
 923                 drive->present = 1;
 924                 drive->media = ide_disk;
 925                 drive->ready_stat = READY_STAT;
 926         }
 927 }
 928
 929 static unsigned int ide_ignore_cable;
 930
 931 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
 932 {
 933         int i, j = 1;
 934
 935         if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
 936                 return -EINVAL;
 937
 938         if (i >= MAX_HWIFS || j < 0 || j > 1)
 939                 return -EINVAL;
 940
 941         if (j)
 942                 ide_ignore_cable |= (1 << i);
 943         else
 944                 ide_ignore_cable &= (1 << i);
 945
 946         return 0;
 947 }
 948
 949 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
 950 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
 951
 952 void ide_port_apply_params(ide_hwif_t *hwif)
 953 {
 954         int i;
 955
 956         if (ide_ignore_cable & (1 << hwif->index)) {
 957                 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
 958                                  hwif->name);
 959                 hwif->cbl = ATA_CBL_PATA40_SHORT;
 960         }
 961
 962         for (i = 0; i < MAX_DRIVES; i++)
 963                 ide_dev_apply_params(&hwif->drives[i]);
 964 }
 965
 966 /*
 967  * This is gets invoked once during initialization, to set *everything* up
 968  */
 969 static int __init ide_init(void)
 970 {
 971         int ret;
 972
 973         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
 974
 975         ret = bus_register(&ide_bus_type);
 976         if (ret < 0) {
 977                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
 978                 return ret;
 979         }
 980
 981         ide_port_class = class_create(THIS_MODULE, "ide_port");
 982         if (IS_ERR(ide_port_class)) {
 983                 ret = PTR_ERR(ide_port_class);
 984                 goto out_port_class;
 985         }
 986
 987         proc_ide_create();
 988
 989         return 0;
 990
 991 out_port_class:
 992         bus_unregister(&ide_bus_type);
 993
 994         return ret;
 995 }
 996
 997 static void __exit ide_exit(void)
 998 {
 999         proc_ide_destroy();
1000
1001         class_destroy(ide_port_class);
1002
1003         bus_unregister(&ide_bus_type);
1004 }
1005
1006 module_init(ide_init);
1007 module_exit(ide_exit);
1008
1009 MODULE_LICENSE("GPL");