err.no Git - linux-2.6/blob - 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 (!drive->id || !(drive->id->capability & 1))
 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 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 506                         unsigned int cmd, unsigned long arg)
 507 {
 508         unsigned long flags;
 509         ide_driver_t *drv;
 510         void __user *p = (void __user *)arg;
 511         int err = 0, (*setfunc)(ide_drive_t *, int);
 512         u8 *val;
 513
 514         switch (cmd) {
 515         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
 516         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
 517         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
 518         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
 519         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
 520         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
 521         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
 522         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
 523         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
 524         }
 525
 526         switch (cmd) {
 527                 case HDIO_OBSOLETE_IDENTITY:
 528                 case HDIO_GET_IDENTITY:
 529                         if (bdev != bdev->bd_contains)
 530                                 return -EINVAL;
 531                         if (drive->id_read == 0)
 532                                 return -ENOMSG;
 533                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
 534                                 return -EFAULT;
 535                         return 0;
 536
 537                 case HDIO_GET_NICE:
 538                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
 539                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
 540                                         drive->nice1 << IDE_NICE_1,
 541                                         (long __user *) arg);
 542 #ifdef CONFIG_IDE_TASK_IOCTL
 543                 case HDIO_DRIVE_TASKFILE:
 544                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 545                                 return -EACCES;
 546                         switch(drive->media) {
 547                                 case ide_disk:
 548                                         return ide_taskfile_ioctl(drive, cmd, arg);
 549                                 default:
 550                                         return -ENOMSG;
 551                         }
 552 #endif /* CONFIG_IDE_TASK_IOCTL */
 553
 554                 case HDIO_DRIVE_CMD:
 555                         if (!capable(CAP_SYS_RAWIO))
 556                                 return -EACCES;
 557                         return ide_cmd_ioctl(drive, cmd, arg);
 558
 559                 case HDIO_DRIVE_TASK:
 560                         if (!capable(CAP_SYS_RAWIO))
 561                                 return -EACCES;
 562                         return ide_task_ioctl(drive, cmd, arg);
 563                 case HDIO_SET_NICE:
 564                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
 565                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
 566                                 return -EPERM;
 567                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
 568                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
 569                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
 570                                 drive->dsc_overlap = 0;
 571                                 return -EPERM;
 572                         }
 573                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
 574                         return 0;
 575                 case HDIO_DRIVE_RESET:
 576                         if (!capable(CAP_SYS_ADMIN))
 577                                 return -EACCES;
 578
 579                         return generic_drive_reset(drive);
 580
 581                 case HDIO_GET_BUSSTATE:
 582                         if (!capable(CAP_SYS_ADMIN))
 583                                 return -EACCES;
 584                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
 585                                 return -EFAULT;
 586                         return 0;
 587
 588                 case HDIO_SET_BUSSTATE:
 589                         if (!capable(CAP_SYS_ADMIN))
 590                                 return -EACCES;
 591                         return -EOPNOTSUPP;
 592                 default:
 593                         return -EINVAL;
 594         }
 595
 596 read_val:
 597         mutex_lock(&ide_setting_mtx);
 598         spin_lock_irqsave(&ide_lock, flags);
 599         err = *val;
 600         spin_unlock_irqrestore(&ide_lock, flags);
 601         mutex_unlock(&ide_setting_mtx);
 602         return err >= 0 ? put_user(err, (long __user *)arg) : err;
 603
 604 set_val:
 605         if (bdev != bdev->bd_contains)
 606                 err = -EINVAL;
 607         else {
 608                 if (!capable(CAP_SYS_ADMIN))
 609                         err = -EACCES;
 610                 else {
 611                         mutex_lock(&ide_setting_mtx);
 612                         err = setfunc(drive, arg);
 613                         mutex_unlock(&ide_setting_mtx);
 614                 }
 615         }
 616         return err;
 617 }
 618
 619 EXPORT_SYMBOL(generic_ide_ioctl);
 620
 621 /**
 622  * ide_device_get       -       get an additional reference to a ide_drive_t
 623  * @drive:      device to get a reference to
 624  *
 625  * Gets a reference to the ide_drive_t and increments the use count of the
 626  * underlying LLDD module.
 627  */
 628 int ide_device_get(ide_drive_t *drive)
 629 {
 630         struct device *host_dev;
 631         struct module *module;
 632
 633         if (!get_device(&drive->gendev))
 634                 return -ENXIO;
 635
 636         host_dev = drive->hwif->host->dev[0];
 637         module = host_dev ? host_dev->driver->owner : NULL;
 638
 639         if (module && !try_module_get(module)) {
 640                 put_device(&drive->gendev);
 641                 return -ENXIO;
 642         }
 643
 644         return 0;
 645 }
 646 EXPORT_SYMBOL_GPL(ide_device_get);
 647
 648 /**
 649  * ide_device_put       -       release a reference to a ide_drive_t
 650  * @drive:      device to release a reference on
 651  *
 652  * Release a reference to the ide_drive_t and decrements the use count of
 653  * the underlying LLDD module.
 654  */
 655 void ide_device_put(ide_drive_t *drive)
 656 {
 657 #ifdef CONFIG_MODULE_UNLOAD
 658         struct device *host_dev = drive->hwif->host->dev[0];
 659         struct module *module = host_dev ? host_dev->driver->owner : NULL;
 660
 661         if (module)
 662                 module_put(module);
 663 #endif
 664         put_device(&drive->gendev);
 665 }
 666 EXPORT_SYMBOL_GPL(ide_device_put);
 667
 668 static int ide_bus_match(struct device *dev, struct device_driver *drv)
 669 {
 670         return 1;
 671 }
 672
 673 static char *media_string(ide_drive_t *drive)
 674 {
 675         switch (drive->media) {
 676         case ide_disk:
 677                 return "disk";
 678         case ide_cdrom:
 679                 return "cdrom";
 680         case ide_tape:
 681                 return "tape";
 682         case ide_floppy:
 683                 return "floppy";
 684         case ide_optical:
 685                 return "optical";
 686         default:
 687                 return "UNKNOWN";
 688         }
 689 }
 690
 691 static ssize_t media_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", media_string(drive));
 695 }
 696
 697 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
 698 {
 699         ide_drive_t *drive = to_ide_device(dev);
 700         return sprintf(buf, "%s\n", drive->name);
 701 }
 702
 703 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 704 {
 705         ide_drive_t *drive = to_ide_device(dev);
 706         return sprintf(buf, "ide:m-%s\n", media_string(drive));
 707 }
 708
 709 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
 710                           char *buf)
 711 {
 712         ide_drive_t *drive = to_ide_device(dev);
 713         return sprintf(buf, "%s\n", drive->id->model);
 714 }
 715
 716 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
 717                              char *buf)
 718 {
 719         ide_drive_t *drive = to_ide_device(dev);
 720         return sprintf(buf, "%s\n", drive->id->fw_rev);
 721 }
 722
 723 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
 724                            char *buf)
 725 {
 726         ide_drive_t *drive = to_ide_device(dev);
 727         return sprintf(buf, "%s\n", drive->id->serial_no);
 728 }
 729
 730 static struct device_attribute ide_dev_attrs[] = {
 731         __ATTR_RO(media),
 732         __ATTR_RO(drivename),
 733         __ATTR_RO(modalias),
 734         __ATTR_RO(model),
 735         __ATTR_RO(firmware),
 736         __ATTR(serial, 0400, serial_show, NULL),
 737         __ATTR_NULL
 738 };
 739
 740 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
 741 {
 742         ide_drive_t *drive = to_ide_device(dev);
 743
 744         add_uevent_var(env, "MEDIA=%s", media_string(drive));
 745         add_uevent_var(env, "DRIVENAME=%s", drive->name);
 746         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
 747         return 0;
 748 }
 749
 750 static int generic_ide_probe(struct device *dev)
 751 {
 752         ide_drive_t *drive = to_ide_device(dev);
 753         ide_driver_t *drv = to_ide_driver(dev->driver);
 754
 755         return drv->probe ? drv->probe(drive) : -ENODEV;
 756 }
 757
 758 static int generic_ide_remove(struct device *dev)
 759 {
 760         ide_drive_t *drive = to_ide_device(dev);
 761         ide_driver_t *drv = to_ide_driver(dev->driver);
 762
 763         if (drv->remove)
 764                 drv->remove(drive);
 765
 766         return 0;
 767 }
 768
 769 static void generic_ide_shutdown(struct device *dev)
 770 {
 771         ide_drive_t *drive = to_ide_device(dev);
 772         ide_driver_t *drv = to_ide_driver(dev->driver);
 773
 774         if (dev->driver && drv->shutdown)
 775                 drv->shutdown(drive);
 776 }
 777
 778 struct bus_type ide_bus_type = {
 779         .name           = "ide",
 780         .match          = ide_bus_match,
 781         .uevent         = ide_uevent,
 782         .probe          = generic_ide_probe,
 783         .remove         = generic_ide_remove,
 784         .shutdown       = generic_ide_shutdown,
 785         .dev_attrs      = ide_dev_attrs,
 786         .suspend        = generic_ide_suspend,
 787         .resume         = generic_ide_resume,
 788 };
 789
 790 EXPORT_SYMBOL_GPL(ide_bus_type);
 791
 792 int ide_vlb_clk;
 793 EXPORT_SYMBOL_GPL(ide_vlb_clk);
 794
 795 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
 796 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
 797
 798 int ide_pci_clk;
 799 EXPORT_SYMBOL_GPL(ide_pci_clk);
 800
 801 module_param_named(pci_clock, ide_pci_clk, int, 0);
 802 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
 803
 804 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
 805 {
 806         int a, b, i, j = 1;
 807         unsigned int *dev_param_mask = (unsigned int *)kp->arg;
 808
 809         if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
 810             sscanf(s, "%d.%d", &a, &b) != 2)
 811                 return -EINVAL;
 812
 813         i = a * MAX_DRIVES + b;
 814
 815         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 816                 return -EINVAL;
 817
 818         if (j)
 819                 *dev_param_mask |= (1 << i);
 820         else
 821                 *dev_param_mask &= (1 << i);
 822
 823         return 0;
 824 }
 825
 826 static unsigned int ide_nodma;
 827
 828 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
 829 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
 830
 831 static unsigned int ide_noflush;
 832
 833 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
 834 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
 835
 836 static unsigned int ide_noprobe;
 837
 838 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
 839 MODULE_PARM_DESC(noprobe, "skip probing for a device");
 840
 841 static unsigned int ide_nowerr;
 842
 843 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
 844 MODULE_PARM_DESC(nowerr, "ignore the WRERR_STAT bit for a device");
 845
 846 static unsigned int ide_cdroms;
 847
 848 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
 849 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
 850
 851 struct chs_geom {
 852         unsigned int    cyl;
 853         u8              head;
 854         u8              sect;
 855 };
 856
 857 static unsigned int ide_disks;
 858 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
 859
 860 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
 861 {
 862         int a, b, c = 0, h = 0, s = 0, i, j = 1;
 863
 864         if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
 865             sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
 866                 return -EINVAL;
 867
 868         i = a * MAX_DRIVES + b;
 869
 870         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 871                 return -EINVAL;
 872
 873         if (c > INT_MAX || h > 255 || s > 255)
 874                 return -EINVAL;
 875
 876         if (j)
 877                 ide_disks |= (1 << i);
 878         else
 879                 ide_disks &= (1 << i);
 880
 881         ide_disks_chs[i].cyl  = c;
 882         ide_disks_chs[i].head = h;
 883         ide_disks_chs[i].sect = s;
 884
 885         return 0;
 886 }
 887
 888 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
 889 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
 890
 891 static void ide_dev_apply_params(ide_drive_t *drive)
 892 {
 893         int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;
 894
 895         if (ide_nodma & (1 << i)) {
 896                 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
 897                 drive->nodma = 1;
 898         }
 899         if (ide_noflush & (1 << i)) {
 900                 printk(KERN_INFO "ide: disabling flush requests for %s\n",
 901                                  drive->name);
 902                 drive->noflush = 1;
 903         }
 904         if (ide_noprobe & (1 << i)) {
 905                 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
 906                 drive->noprobe = 1;
 907         }
 908         if (ide_nowerr & (1 << i)) {
 909                 printk(KERN_INFO "ide: ignoring the WRERR_STAT bit for %s\n",
 910                                  drive->name);
 911                 drive->bad_wstat = BAD_R_STAT;
 912         }
 913         if (ide_cdroms & (1 << i)) {
 914                 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
 915                 drive->present = 1;
 916                 drive->media = ide_cdrom;
 917                 /* an ATAPI device ignores DRDY */
 918                 drive->ready_stat = 0;
 919         }
 920         if (ide_disks & (1 << i)) {
 921                 drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
 922                 drive->head = drive->bios_head = ide_disks_chs[i].head;
 923                 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
 924                 drive->forced_geom = 1;
 925                 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
 926                                  drive->name,
 927                                  drive->cyl, drive->head, drive->sect);
 928                 drive->present = 1;
 929                 drive->media = ide_disk;
 930                 drive->ready_stat = READY_STAT;
 931         }
 932 }
 933
 934 static unsigned int ide_ignore_cable;
 935
 936 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
 937 {
 938         int i, j = 1;
 939
 940         if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
 941                 return -EINVAL;
 942
 943         if (i >= MAX_HWIFS || j < 0 || j > 1)
 944                 return -EINVAL;
 945
 946         if (j)
 947                 ide_ignore_cable |= (1 << i);
 948         else
 949                 ide_ignore_cable &= (1 << i);
 950
 951         return 0;
 952 }
 953
 954 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
 955 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
 956
 957 void ide_port_apply_params(ide_hwif_t *hwif)
 958 {
 959         int i;
 960
 961         if (ide_ignore_cable & (1 << hwif->index)) {
 962                 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
 963                                  hwif->name);
 964                 hwif->cbl = ATA_CBL_PATA40_SHORT;
 965         }
 966
 967         for (i = 0; i < MAX_DRIVES; i++)
 968                 ide_dev_apply_params(&hwif->drives[i]);
 969 }
 970
 971 /*
 972  * This is gets invoked once during initialization, to set *everything* up
 973  */
 974 static int __init ide_init(void)
 975 {
 976         int ret;
 977
 978         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
 979
 980         ret = bus_register(&ide_bus_type);
 981         if (ret < 0) {
 982                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
 983                 return ret;
 984         }
 985
 986         ide_port_class = class_create(THIS_MODULE, "ide_port");
 987         if (IS_ERR(ide_port_class)) {
 988                 ret = PTR_ERR(ide_port_class);
 989                 goto out_port_class;
 990         }
 991
 992         proc_ide_create();
 993
 994         return 0;
 995
 996 out_port_class:
 997         bus_unregister(&ide_bus_type);
 998
 999         return ret;
1000 }
1001
1002 static void __exit ide_exit(void)
1003 {
1004         proc_ide_destroy();
1005
1006         class_destroy(ide_port_class);
1007
1008         bus_unregister(&ide_bus_type);
1009 }
1010
1011 module_init(ide_init);
1012 module_exit(ide_exit);
1013
1014 MODULE_LICENSE("GPL");