drivers/ide/ide.c

   1 /*
   2  *  Copyright (C) 1994-1998         Linus Torvalds & authors (see below)
   3  *  Copyright (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 /* Called with ide_lock held. */
 137 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
 138 {
 139         int i;
 140
 141         for (i = 0; i < MAX_DRIVES; i++) {
 142                 ide_drive_t *drive = &hwif->drives[i];
 143
 144                 if (drive->present) {
 145                         spin_unlock_irq(&ide_lock);
 146                         device_unregister(&drive->gendev);
 147                         wait_for_completion(&drive->gendev_rel_comp);
 148                         spin_lock_irq(&ide_lock);
 149                 }
 150         }
 151 }
 152
 153 void ide_port_unregister_devices(ide_hwif_t *hwif)
 154 {
 155         mutex_lock(&ide_cfg_mtx);
 156         spin_lock_irq(&ide_lock);
 157         __ide_port_unregister_devices(hwif);
 158         hwif->present = 0;
 159         ide_port_init_devices_data(hwif);
 160         spin_unlock_irq(&ide_lock);
 161         mutex_unlock(&ide_cfg_mtx);
 162 }
 163 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
 164
 165 /**
 166  *      ide_unregister          -       free an IDE interface
 167  *      @hwif: IDE interface
 168  *
 169  *      Perform the final unregister of an IDE interface. At the moment
 170  *      we don't refcount interfaces so this will also get split up.
 171  *
 172  *      Locking:
 173  *      The caller must not hold the IDE locks
 174  *      The drive present/vanishing is not yet properly locked
 175  *      Take care with the callbacks. These have been split to avoid
 176  *      deadlocking the IDE layer. The shutdown callback is called
 177  *      before we take the lock and free resources. It is up to the
 178  *      caller to be sure there is no pending I/O here, and that
 179  *      the interface will not be reopened (present/vanishing locking
 180  *      isn't yet done BTW). After we commit to the final kill we
 181  *      call the cleanup callback with the ide locks held.
 182  *
 183  *      Unregister restores the hwif structures to the default state.
 184  *      This is raving bonkers.
 185  */
 186
 187 void ide_unregister(ide_hwif_t *hwif)
 188 {
 189         ide_hwif_t *g;
 190         ide_hwgroup_t *hwgroup;
 191         int irq_count = 0;
 192
 193         BUG_ON(in_interrupt());
 194         BUG_ON(irqs_disabled());
 195
 196         mutex_lock(&ide_cfg_mtx);
 197
 198         spin_lock_irq(&ide_lock);
 199         if (hwif->present) {
 200                 __ide_port_unregister_devices(hwif);
 201                 hwif->present = 0;
 202         }
 203         spin_unlock_irq(&ide_lock);
 204
 205         ide_proc_unregister_port(hwif);
 206
 207         hwgroup = hwif->hwgroup;
 208         /*
 209          * free the irq if we were the only hwif using it
 210          */
 211         g = hwgroup->hwif;
 212         do {
 213                 if (g->irq == hwif->irq)
 214                         ++irq_count;
 215                 g = g->next;
 216         } while (g != hwgroup->hwif);
 217         if (irq_count == 1)
 218                 free_irq(hwif->irq, hwgroup);
 219
 220         ide_remove_port_from_hwgroup(hwif);
 221
 222         device_unregister(hwif->portdev);
 223         device_unregister(&hwif->gendev);
 224         wait_for_completion(&hwif->gendev_rel_comp);
 225
 226         /*
 227          * Remove us from the kernel's knowledge
 228          */
 229         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 230         kfree(hwif->sg_table);
 231         unregister_blkdev(hwif->major, hwif->name);
 232
 233         if (hwif->dma_base)
 234                 ide_release_dma_engine(hwif);
 235
 236         mutex_unlock(&ide_cfg_mtx);
 237 }
 238
 239 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
 240 {
 241         memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
 242         hwif->irq = hw->irq;
 243         hwif->chipset = hw->chipset;
 244         hwif->dev = hw->dev;
 245         hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
 246         hwif->ack_intr = hw->ack_intr;
 247         hwif->config_data = hw->config;
 248 }
 249
 250 /*
 251  *      Locks for IDE setting functionality
 252  */
 253
 254 DEFINE_MUTEX(ide_setting_mtx);
 255
 256 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 257
 258 /**
 259  *      ide_spin_wait_hwgroup   -       wait for group
 260  *      @drive: drive in the group
 261  *
 262  *      Wait for an IDE device group to go non busy and then return
 263  *      holding the ide_lock which guards the hwgroup->busy status
 264  *      and right to use it.
 265  */
 266
 267 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 268 {
 269         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 270         unsigned long timeout = jiffies + (3 * HZ);
 271
 272         spin_lock_irq(&ide_lock);
 273
 274         while (hwgroup->busy) {
 275                 unsigned long lflags;
 276                 spin_unlock_irq(&ide_lock);
 277                 local_irq_set(lflags);
 278                 if (time_after(jiffies, timeout)) {
 279                         local_irq_restore(lflags);
 280                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 281                         return -EBUSY;
 282                 }
 283                 local_irq_restore(lflags);
 284                 spin_lock_irq(&ide_lock);
 285         }
 286         return 0;
 287 }
 288
 289 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 290
 291 int set_io_32bit(ide_drive_t *drive, int arg)
 292 {
 293         if (drive->no_io_32bit)
 294                 return -EPERM;
 295
 296         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 297                 return -EINVAL;
 298
 299         if (ide_spin_wait_hwgroup(drive))
 300                 return -EBUSY;
 301
 302         drive->io_32bit = arg;
 303
 304         spin_unlock_irq(&ide_lock);
 305
 306         return 0;
 307 }
 308
 309 static int set_ksettings(ide_drive_t *drive, int arg)
 310 {
 311         if (arg < 0 || arg > 1)
 312                 return -EINVAL;
 313
 314         if (ide_spin_wait_hwgroup(drive))
 315                 return -EBUSY;
 316         drive->keep_settings = arg;
 317         spin_unlock_irq(&ide_lock);
 318
 319         return 0;
 320 }
 321
 322 int set_using_dma(ide_drive_t *drive, int arg)
 323 {
 324 #ifdef CONFIG_BLK_DEV_IDEDMA
 325         ide_hwif_t *hwif = drive->hwif;
 326         int err = -EPERM;
 327
 328         if (arg < 0 || arg > 1)
 329                 return -EINVAL;
 330
 331         if (ata_id_has_dma(drive->id) == 0)
 332                 goto out;
 333
 334         if (hwif->dma_ops == NULL)
 335                 goto out;
 336
 337         err = -EBUSY;
 338         if (ide_spin_wait_hwgroup(drive))
 339                 goto out;
 340         /*
 341          * set ->busy flag, unlock and let it ride
 342          */
 343         hwif->hwgroup->busy = 1;
 344         spin_unlock_irq(&ide_lock);
 345
 346         err = 0;
 347
 348         if (arg) {
 349                 if (ide_set_dma(drive))
 350                         err = -EIO;
 351         } else
 352                 ide_dma_off(drive);
 353
 354         /*
 355          * lock, clear ->busy flag and unlock before leaving
 356          */
 357         spin_lock_irq(&ide_lock);
 358         hwif->hwgroup->busy = 0;
 359         spin_unlock_irq(&ide_lock);
 360 out:
 361         return err;
 362 #else
 363         if (arg < 0 || arg > 1)
 364                 return -EINVAL;
 365
 366         return -EPERM;
 367 #endif
 368 }
 369
 370 int set_pio_mode(ide_drive_t *drive, int arg)
 371 {
 372         struct request *rq;
 373         ide_hwif_t *hwif = drive->hwif;
 374         const struct ide_port_ops *port_ops = hwif->port_ops;
 375
 376         if (arg < 0 || arg > 255)
 377                 return -EINVAL;
 378
 379         if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
 380             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
 381                 return -ENOSYS;
 382
 383         if (drive->special.b.set_tune)
 384                 return -EBUSY;
 385
 386         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 387         rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
 388
 389         drive->tune_req = (u8) arg;
 390         drive->special.b.set_tune = 1;
 391
 392         blk_execute_rq(drive->queue, NULL, rq, 0);
 393         blk_put_request(rq);
 394
 395         return 0;
 396 }
 397
 398 static int set_unmaskirq(ide_drive_t *drive, int arg)
 399 {
 400         if (drive->no_unmask)
 401                 return -EPERM;
 402
 403         if (arg < 0 || arg > 1)
 404                 return -EINVAL;
 405
 406         if (ide_spin_wait_hwgroup(drive))
 407                 return -EBUSY;
 408         drive->unmask = arg;
 409         spin_unlock_irq(&ide_lock);
 410
 411         return 0;
 412 }
 413
 414 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 415 {
 416         ide_drive_t *drive = dev->driver_data;
 417         ide_hwif_t *hwif = HWIF(drive);
 418         struct request *rq;
 419         struct request_pm_state rqpm;
 420         ide_task_t args;
 421         int ret;
 422
 423         /* Call ACPI _GTM only once */
 424         if (!(drive->dn % 2))
 425                 ide_acpi_get_timing(hwif);
 426
 427         memset(&rqpm, 0, sizeof(rqpm));
 428         memset(&args, 0, sizeof(args));
 429         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 430         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
 431         rq->special = &args;
 432         rq->data = &rqpm;
 433         rqpm.pm_step = ide_pm_state_start_suspend;
 434         if (mesg.event == PM_EVENT_PRETHAW)
 435                 mesg.event = PM_EVENT_FREEZE;
 436         rqpm.pm_state = mesg.event;
 437
 438         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
 439         blk_put_request(rq);
 440         /* only call ACPI _PS3 after both drivers are suspended */
 441         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 442                  && hwif->drives[1].present)
 443                  || !hwif->drives[0].present
 444                  || !hwif->drives[1].present))
 445                 ide_acpi_set_state(hwif, 0);
 446         return ret;
 447 }
 448
 449 static int generic_ide_resume(struct device *dev)
 450 {
 451         ide_drive_t *drive = dev->driver_data;
 452         ide_hwif_t *hwif = HWIF(drive);
 453         struct request *rq;
 454         struct request_pm_state rqpm;
 455         ide_task_t args;
 456         int err;
 457
 458         /* Call ACPI _STM only once */
 459         if (!(drive->dn % 2)) {
 460                 ide_acpi_set_state(hwif, 1);
 461                 ide_acpi_push_timing(hwif);
 462         }
 463
 464         ide_acpi_exec_tfs(drive);
 465
 466         memset(&rqpm, 0, sizeof(rqpm));
 467         memset(&args, 0, sizeof(args));
 468         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 469         rq->cmd_type = REQ_TYPE_PM_RESUME;
 470         rq->cmd_flags |= REQ_PREEMPT;
 471         rq->special = &args;
 472         rq->data = &rqpm;
 473         rqpm.pm_step = ide_pm_state_start_resume;
 474         rqpm.pm_state = PM_EVENT_ON;
 475
 476         err = blk_execute_rq(drive->queue, NULL, rq, 1);
 477         blk_put_request(rq);
 478
 479         if (err == 0 && dev->driver) {
 480                 ide_driver_t *drv = to_ide_driver(dev->driver);
 481
 482                 if (drv->resume)
 483                         drv->resume(drive);
 484         }
 485
 486         return err;
 487 }
 488
 489 static int generic_drive_reset(ide_drive_t *drive)
 490 {
 491         struct request *rq;
 492         int ret = 0;
 493
 494         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 495         rq->cmd_type = REQ_TYPE_SPECIAL;
 496         rq->cmd_len = 1;
 497         rq->cmd[0] = REQ_DRIVE_RESET;
 498         rq->cmd_flags |= REQ_SOFTBARRIER;
 499         if (blk_execute_rq(drive->queue, NULL, rq, 1))
 500                 ret = rq->errors;
 501         blk_put_request(rq);
 502         return ret;
 503 }
 504
 505 static inline void ide_id_to_hd_driveid(u16 *id)
 506 {
 507 #ifdef __BIG_ENDIAN
 508         /* accessed in struct hd_driveid as 8-bit values */
 509         id[ATA_ID_MAX_MULTSECT]  = __cpu_to_le16(id[ATA_ID_MAX_MULTSECT]);
 510         id[ATA_ID_CAPABILITY]    = __cpu_to_le16(id[ATA_ID_CAPABILITY]);
 511         id[ATA_ID_OLD_PIO_MODES] = __cpu_to_le16(id[ATA_ID_OLD_PIO_MODES]);
 512         id[ATA_ID_OLD_DMA_MODES] = __cpu_to_le16(id[ATA_ID_OLD_DMA_MODES]);
 513         id[ATA_ID_MULTSECT]      = __cpu_to_le16(id[ATA_ID_MULTSECT]);
 514
 515         /* as 32-bit values */
 516         *(u32 *)&id[ATA_ID_LBA_CAPACITY] = ata_id_u32(id, ATA_ID_LBA_CAPACITY);
 517         *(u32 *)&id[ATA_ID_SPG]          = ata_id_u32(id, ATA_ID_SPG);
 518
 519         /* as 64-bit value */
 520         *(u64 *)&id[ATA_ID_LBA_CAPACITY_2] =
 521                 ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
 522 #endif
 523 }
 524
 525 static int ide_get_identity_ioctl(ide_drive_t *drive, unsigned int cmd,
 526                                   unsigned long arg)
 527 {
 528         u16 *id = NULL;
 529         int size = (cmd == HDIO_GET_IDENTITY) ? (ATA_ID_WORDS * 2) : 142;
 530         int rc = 0;
 531
 532         if (drive->id_read == 0) {
 533                 rc = -ENOMSG;
 534                 goto out;
 535         }
 536
 537         id = kmalloc(size, GFP_KERNEL);
 538         if (id == NULL) {
 539                 rc = -ENOMEM;
 540                 goto out;
 541         }
 542
 543         memcpy(id, drive->id, size);
 544         ide_id_to_hd_driveid(id);
 545
 546         if (copy_to_user((void __user *)arg, id, size))
 547                 rc = -EFAULT;
 548
 549         kfree(id);
 550 out:
 551         return rc;
 552 }
 553
 554 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 555                         unsigned int cmd, unsigned long arg)
 556 {
 557         unsigned long flags;
 558         ide_driver_t *drv;
 559         int err = 0, (*setfunc)(ide_drive_t *, int);
 560         u8 *val;
 561
 562         switch (cmd) {
 563         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
 564         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
 565         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
 566         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
 567         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
 568         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
 569         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
 570         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
 571         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
 572         }
 573
 574         switch (cmd) {
 575                 case HDIO_OBSOLETE_IDENTITY:
 576                 case HDIO_GET_IDENTITY:
 577                         if (bdev != bdev->bd_contains)
 578                                 return -EINVAL;
 579                         return ide_get_identity_ioctl(drive, cmd, arg);
 580                 case HDIO_GET_NICE:
 581                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
 582                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
 583                                         drive->nice1 << IDE_NICE_1,
 584                                         (long __user *) arg);
 585 #ifdef CONFIG_IDE_TASK_IOCTL
 586                 case HDIO_DRIVE_TASKFILE:
 587                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 588                                 return -EACCES;
 589                         switch(drive->media) {
 590                                 case ide_disk:
 591                                         return ide_taskfile_ioctl(drive, cmd, arg);
 592                                 default:
 593                                         return -ENOMSG;
 594                         }
 595 #endif /* CONFIG_IDE_TASK_IOCTL */
 596
 597                 case HDIO_DRIVE_CMD:
 598                         if (!capable(CAP_SYS_RAWIO))
 599                                 return -EACCES;
 600                         return ide_cmd_ioctl(drive, cmd, arg);
 601
 602                 case HDIO_DRIVE_TASK:
 603                         if (!capable(CAP_SYS_RAWIO))
 604                                 return -EACCES;
 605                         return ide_task_ioctl(drive, cmd, arg);
 606                 case HDIO_SET_NICE:
 607                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
 608                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
 609                                 return -EPERM;
 610                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
 611                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
 612                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
 613                                 drive->dsc_overlap = 0;
 614                                 return -EPERM;
 615                         }
 616                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
 617                         return 0;
 618                 case HDIO_DRIVE_RESET:
 619                         if (!capable(CAP_SYS_ADMIN))
 620                                 return -EACCES;
 621
 622                         return generic_drive_reset(drive);
 623
 624                 case HDIO_GET_BUSSTATE:
 625                         if (!capable(CAP_SYS_ADMIN))
 626                                 return -EACCES;
 627                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
 628                                 return -EFAULT;
 629                         return 0;
 630
 631                 case HDIO_SET_BUSSTATE:
 632                         if (!capable(CAP_SYS_ADMIN))
 633                                 return -EACCES;
 634                         return -EOPNOTSUPP;
 635                 default:
 636                         return -EINVAL;
 637         }
 638
 639 read_val:
 640         mutex_lock(&ide_setting_mtx);
 641         spin_lock_irqsave(&ide_lock, flags);
 642         err = *val;
 643         spin_unlock_irqrestore(&ide_lock, flags);
 644         mutex_unlock(&ide_setting_mtx);
 645         return err >= 0 ? put_user(err, (long __user *)arg) : err;
 646
 647 set_val:
 648         if (bdev != bdev->bd_contains)
 649                 err = -EINVAL;
 650         else {
 651                 if (!capable(CAP_SYS_ADMIN))
 652                         err = -EACCES;
 653                 else {
 654                         mutex_lock(&ide_setting_mtx);
 655                         err = setfunc(drive, arg);
 656                         mutex_unlock(&ide_setting_mtx);
 657                 }
 658         }
 659         return err;
 660 }
 661
 662 EXPORT_SYMBOL(generic_ide_ioctl);
 663
 664 /**
 665  * ide_device_get       -       get an additional reference to a ide_drive_t
 666  * @drive:      device to get a reference to
 667  *
 668  * Gets a reference to the ide_drive_t and increments the use count of the
 669  * underlying LLDD module.
 670  */
 671 int ide_device_get(ide_drive_t *drive)
 672 {
 673         struct device *host_dev;
 674         struct module *module;
 675
 676         if (!get_device(&drive->gendev))
 677                 return -ENXIO;
 678
 679         host_dev = drive->hwif->host->dev[0];
 680         module = host_dev ? host_dev->driver->owner : NULL;
 681
 682         if (module && !try_module_get(module)) {
 683                 put_device(&drive->gendev);
 684                 return -ENXIO;
 685         }
 686
 687         return 0;
 688 }
 689 EXPORT_SYMBOL_GPL(ide_device_get);
 690
 691 /**
 692  * ide_device_put       -       release a reference to a ide_drive_t
 693  * @drive:      device to release a reference on
 694  *
 695  * Release a reference to the ide_drive_t and decrements the use count of
 696  * the underlying LLDD module.
 697  */
 698 void ide_device_put(ide_drive_t *drive)
 699 {
 700 #ifdef CONFIG_MODULE_UNLOAD
 701         struct device *host_dev = drive->hwif->host->dev[0];
 702         struct module *module = host_dev ? host_dev->driver->owner : NULL;
 703
 704         if (module)
 705                 module_put(module);
 706 #endif
 707         put_device(&drive->gendev);
 708 }
 709 EXPORT_SYMBOL_GPL(ide_device_put);
 710
 711 static int ide_bus_match(struct device *dev, struct device_driver *drv)
 712 {
 713         return 1;
 714 }
 715
 716 static char *media_string(ide_drive_t *drive)
 717 {
 718         switch (drive->media) {
 719         case ide_disk:
 720                 return "disk";
 721         case ide_cdrom:
 722                 return "cdrom";
 723         case ide_tape:
 724                 return "tape";
 725         case ide_floppy:
 726                 return "floppy";
 727         case ide_optical:
 728                 return "optical";
 729         default:
 730                 return "UNKNOWN";
 731         }
 732 }
 733
 734 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
 735 {
 736         ide_drive_t *drive = to_ide_device(dev);
 737         return sprintf(buf, "%s\n", media_string(drive));
 738 }
 739
 740 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
 741 {
 742         ide_drive_t *drive = to_ide_device(dev);
 743         return sprintf(buf, "%s\n", drive->name);
 744 }
 745
 746 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 747 {
 748         ide_drive_t *drive = to_ide_device(dev);
 749         return sprintf(buf, "ide:m-%s\n", media_string(drive));
 750 }
 751
 752 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
 753                           char *buf)
 754 {
 755         ide_drive_t *drive = to_ide_device(dev);
 756         return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_PROD]);
 757 }
 758
 759 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
 760                              char *buf)
 761 {
 762         ide_drive_t *drive = to_ide_device(dev);
 763         return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_FW_REV]);
 764 }
 765
 766 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
 767                            char *buf)
 768 {
 769         ide_drive_t *drive = to_ide_device(dev);
 770         return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_SERNO]);
 771 }
 772
 773 static struct device_attribute ide_dev_attrs[] = {
 774         __ATTR_RO(media),
 775         __ATTR_RO(drivename),
 776         __ATTR_RO(modalias),
 777         __ATTR_RO(model),
 778         __ATTR_RO(firmware),
 779         __ATTR(serial, 0400, serial_show, NULL),
 780         __ATTR_NULL
 781 };
 782
 783 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
 784 {
 785         ide_drive_t *drive = to_ide_device(dev);
 786
 787         add_uevent_var(env, "MEDIA=%s", media_string(drive));
 788         add_uevent_var(env, "DRIVENAME=%s", drive->name);
 789         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
 790         return 0;
 791 }
 792
 793 static int generic_ide_probe(struct device *dev)
 794 {
 795         ide_drive_t *drive = to_ide_device(dev);
 796         ide_driver_t *drv = to_ide_driver(dev->driver);
 797
 798         return drv->probe ? drv->probe(drive) : -ENODEV;
 799 }
 800
 801 static int generic_ide_remove(struct device *dev)
 802 {
 803         ide_drive_t *drive = to_ide_device(dev);
 804         ide_driver_t *drv = to_ide_driver(dev->driver);
 805
 806         if (drv->remove)
 807                 drv->remove(drive);
 808
 809         return 0;
 810 }
 811
 812 static void generic_ide_shutdown(struct device *dev)
 813 {
 814         ide_drive_t *drive = to_ide_device(dev);
 815         ide_driver_t *drv = to_ide_driver(dev->driver);
 816
 817         if (dev->driver && drv->shutdown)
 818                 drv->shutdown(drive);
 819 }
 820
 821 struct bus_type ide_bus_type = {
 822         .name           = "ide",
 823         .match          = ide_bus_match,
 824         .uevent         = ide_uevent,
 825         .probe          = generic_ide_probe,
 826         .remove         = generic_ide_remove,
 827         .shutdown       = generic_ide_shutdown,
 828         .dev_attrs      = ide_dev_attrs,
 829         .suspend        = generic_ide_suspend,
 830         .resume         = generic_ide_resume,
 831 };
 832
 833 EXPORT_SYMBOL_GPL(ide_bus_type);
 834
 835 int ide_vlb_clk;
 836 EXPORT_SYMBOL_GPL(ide_vlb_clk);
 837
 838 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
 839 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
 840
 841 int ide_pci_clk;
 842 EXPORT_SYMBOL_GPL(ide_pci_clk);
 843
 844 module_param_named(pci_clock, ide_pci_clk, int, 0);
 845 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
 846
 847 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
 848 {
 849         int a, b, i, j = 1;
 850         unsigned int *dev_param_mask = (unsigned int *)kp->arg;
 851
 852         if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
 853             sscanf(s, "%d.%d", &a, &b) != 2)
 854                 return -EINVAL;
 855
 856         i = a * MAX_DRIVES + b;
 857
 858         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 859                 return -EINVAL;
 860
 861         if (j)
 862                 *dev_param_mask |= (1 << i);
 863         else
 864                 *dev_param_mask &= (1 << i);
 865
 866         return 0;
 867 }
 868
 869 static unsigned int ide_nodma;
 870
 871 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
 872 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
 873
 874 static unsigned int ide_noflush;
 875
 876 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
 877 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
 878
 879 static unsigned int ide_noprobe;
 880
 881 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
 882 MODULE_PARM_DESC(noprobe, "skip probing for a device");
 883
 884 static unsigned int ide_nowerr;
 885
 886 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
 887 MODULE_PARM_DESC(nowerr, "ignore the WRERR_STAT bit for a device");
 888
 889 static unsigned int ide_cdroms;
 890
 891 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
 892 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
 893
 894 struct chs_geom {
 895         unsigned int    cyl;
 896         u8              head;
 897         u8              sect;
 898 };
 899
 900 static unsigned int ide_disks;
 901 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
 902
 903 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
 904 {
 905         int a, b, c = 0, h = 0, s = 0, i, j = 1;
 906
 907         if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
 908             sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
 909                 return -EINVAL;
 910
 911         i = a * MAX_DRIVES + b;
 912
 913         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 914                 return -EINVAL;
 915
 916         if (c > INT_MAX || h > 255 || s > 255)
 917                 return -EINVAL;
 918
 919         if (j)
 920                 ide_disks |= (1 << i);
 921         else
 922                 ide_disks &= (1 << i);
 923
 924         ide_disks_chs[i].cyl  = c;
 925         ide_disks_chs[i].head = h;
 926         ide_disks_chs[i].sect = s;
 927
 928         return 0;
 929 }
 930
 931 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
 932 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
 933
 934 static void ide_dev_apply_params(ide_drive_t *drive)
 935 {
 936         int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;
 937
 938         if (ide_nodma & (1 << i)) {
 939                 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
 940                 drive->nodma = 1;
 941         }
 942         if (ide_noflush & (1 << i)) {
 943                 printk(KERN_INFO "ide: disabling flush requests for %s\n",
 944                                  drive->name);
 945                 drive->noflush = 1;
 946         }
 947         if (ide_noprobe & (1 << i)) {
 948                 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
 949                 drive->noprobe = 1;
 950         }
 951         if (ide_nowerr & (1 << i)) {
 952                 printk(KERN_INFO "ide: ignoring the WRERR_STAT bit for %s\n",
 953                                  drive->name);
 954                 drive->bad_wstat = BAD_R_STAT;
 955         }
 956         if (ide_cdroms & (1 << i)) {
 957                 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
 958                 drive->present = 1;
 959                 drive->media = ide_cdrom;
 960                 /* an ATAPI device ignores DRDY */
 961                 drive->ready_stat = 0;
 962         }
 963         if (ide_disks & (1 << i)) {
 964                 drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
 965                 drive->head = drive->bios_head = ide_disks_chs[i].head;
 966                 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
 967                 drive->forced_geom = 1;
 968                 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
 969                                  drive->name,
 970                                  drive->cyl, drive->head, drive->sect);
 971                 drive->present = 1;
 972                 drive->media = ide_disk;
 973                 drive->ready_stat = READY_STAT;
 974         }
 975 }
 976
 977 static unsigned int ide_ignore_cable;
 978
 979 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
 980 {
 981         int i, j = 1;
 982
 983         if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
 984                 return -EINVAL;
 985
 986         if (i >= MAX_HWIFS || j < 0 || j > 1)
 987                 return -EINVAL;
 988
 989         if (j)
 990                 ide_ignore_cable |= (1 << i);
 991         else
 992                 ide_ignore_cable &= (1 << i);
 993
 994         return 0;
 995 }
 996
 997 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
 998 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
 999
1000 void ide_port_apply_params(ide_hwif_t *hwif)
1001 {
1002         int i;
1003
1004         if (ide_ignore_cable & (1 << hwif->index)) {
1005                 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
1006                                  hwif->name);
1007                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1008         }
1009
1010         for (i = 0; i < MAX_DRIVES; i++)
1011                 ide_dev_apply_params(&hwif->drives[i]);
1012 }
1013
1014 /*
1015  * This is gets invoked once during initialization, to set *everything* up
1016  */
1017 static int __init ide_init(void)
1018 {
1019         int ret;
1020
1021         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
1022
1023         ret = bus_register(&ide_bus_type);
1024         if (ret < 0) {
1025                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1026                 return ret;
1027         }
1028
1029         ide_port_class = class_create(THIS_MODULE, "ide_port");
1030         if (IS_ERR(ide_port_class)) {
1031                 ret = PTR_ERR(ide_port_class);
1032                 goto out_port_class;
1033         }
1034
1035         proc_ide_create();
1036
1037         return 0;
1038
1039 out_port_class:
1040         bus_unregister(&ide_bus_type);
1041
1042         return ret;
1043 }
1044
1045 static void __exit ide_exit(void)
1046 {
1047         proc_ide_destroy();
1048
1049         class_destroy(ide_port_class);
1050
1051         bus_unregister(&ide_bus_type);
1052 }
1053
1054 module_init(ide_init);
1055 module_exit(ide_exit);
1056
1057 MODULE_LICENSE("GPL");