err.no 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/timer.h>
  54 #include <linux/mm.h>
  55 #include <linux/interrupt.h>
  56 #include <linux/major.h>
  57 #include <linux/errno.h>
  58 #include <linux/genhd.h>
  59 #include <linux/blkpg.h>
  60 #include <linux/slab.h>
  61 #include <linux/init.h>
  62 #include <linux/pci.h>
  63 #include <linux/delay.h>
  64 #include <linux/ide.h>
  65 #include <linux/completion.h>
  66 #include <linux/reboot.h>
  67 #include <linux/cdrom.h>
  68 #include <linux/seq_file.h>
  69 #include <linux/device.h>
  70 #include <linux/bitops.h>
  71
  72 #include <asm/byteorder.h>
  73 #include <asm/irq.h>
  74 #include <asm/uaccess.h>
  75 #include <asm/io.h>
  76
  77
  78 /* default maximum number of failures */
  79 #define IDE_DEFAULT_MAX_FAILURES        1
  80
  81 struct class *ide_port_class;
  82
  83 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
  84                                         IDE2_MAJOR, IDE3_MAJOR,
  85                                         IDE4_MAJOR, IDE5_MAJOR,
  86                                         IDE6_MAJOR, IDE7_MAJOR,
  87                                         IDE8_MAJOR, IDE9_MAJOR };
  88
  89 DEFINE_MUTEX(ide_cfg_mtx);
  90
  91 __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
  92 EXPORT_SYMBOL(ide_lock);
  93
  94 static void ide_port_init_devices_data(ide_hwif_t *);
  95
  96 /*
  97  * Do not even *think* about calling this!
  98  */
  99 void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
 100 {
 101         /* bulk initialize hwif & drive info with zeros */
 102         memset(hwif, 0, sizeof(ide_hwif_t));
 103
 104         /* fill in any non-zero initial values */
 105         hwif->index     = index;
 106         hwif->major     = ide_hwif_to_major[index];
 107
 108         hwif->name[0]   = 'i';
 109         hwif->name[1]   = 'd';
 110         hwif->name[2]   = 'e';
 111         hwif->name[3]   = '0' + index;
 112
 113         hwif->bus_state = BUSSTATE_ON;
 114
 115         init_completion(&hwif->gendev_rel_comp);
 116
 117         default_hwif_iops(hwif);
 118         default_hwif_transport(hwif);
 119
 120         ide_port_init_devices_data(hwif);
 121 }
 122
 123 static void ide_port_init_devices_data(ide_hwif_t *hwif)
 124 {
 125         int unit;
 126
 127         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 128                 ide_drive_t *drive = &hwif->drives[unit];
 129                 u8 j = (hwif->index * MAX_DRIVES) + unit;
 130
 131                 memset(drive, 0, sizeof(*drive));
 132
 133                 drive->media                    = ide_disk;
 134                 drive->select.all               = (unit<<4)|0xa0;
 135                 drive->hwif                     = hwif;
 136                 drive->ready_stat               = READY_STAT;
 137                 drive->bad_wstat                = BAD_W_STAT;
 138                 drive->special.b.recalibrate    = 1;
 139                 drive->special.b.set_geometry   = 1;
 140                 drive->name[0]                  = 'h';
 141                 drive->name[1]                  = 'd';
 142                 drive->name[2]                  = 'a' + j;
 143                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
 144
 145                 INIT_LIST_HEAD(&drive->list);
 146                 init_completion(&drive->gendev_rel_comp);
 147         }
 148 }
 149
 150 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
 151 {
 152         ide_hwgroup_t *hwgroup = hwif->hwgroup;
 153
 154         spin_lock_irq(&ide_lock);
 155         /*
 156          * Remove us from the hwgroup, and free
 157          * the hwgroup if we were the only member
 158          */
 159         if (hwif->next == hwif) {
 160                 BUG_ON(hwgroup->hwif != hwif);
 161                 kfree(hwgroup);
 162         } else {
 163                 /* There is another interface in hwgroup.
 164                  * Unlink us, and set hwgroup->drive and ->hwif to
 165                  * something sane.
 166                  */
 167                 ide_hwif_t *g = hwgroup->hwif;
 168
 169                 while (g->next != hwif)
 170                         g = g->next;
 171                 g->next = hwif->next;
 172                 if (hwgroup->hwif == hwif) {
 173                         /* Chose a random hwif for hwgroup->hwif.
 174                          * It's guaranteed that there are no drives
 175                          * left in the hwgroup.
 176                          */
 177                         BUG_ON(hwgroup->drive != NULL);
 178                         hwgroup->hwif = g;
 179                 }
 180                 BUG_ON(hwgroup->hwif == hwif);
 181         }
 182         spin_unlock_irq(&ide_lock);
 183 }
 184
 185 /* Called with ide_lock held. */
 186 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
 187 {
 188         int i;
 189
 190         for (i = 0; i < MAX_DRIVES; i++) {
 191                 ide_drive_t *drive = &hwif->drives[i];
 192
 193                 if (drive->present) {
 194                         spin_unlock_irq(&ide_lock);
 195                         device_unregister(&drive->gendev);
 196                         wait_for_completion(&drive->gendev_rel_comp);
 197                         spin_lock_irq(&ide_lock);
 198                 }
 199         }
 200 }
 201
 202 void ide_port_unregister_devices(ide_hwif_t *hwif)
 203 {
 204         mutex_lock(&ide_cfg_mtx);
 205         spin_lock_irq(&ide_lock);
 206         __ide_port_unregister_devices(hwif);
 207         hwif->present = 0;
 208         ide_port_init_devices_data(hwif);
 209         spin_unlock_irq(&ide_lock);
 210         mutex_unlock(&ide_cfg_mtx);
 211 }
 212 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
 213
 214 /**
 215  *      ide_unregister          -       free an IDE interface
 216  *      @hwif: IDE interface
 217  *
 218  *      Perform the final unregister of an IDE interface. At the moment
 219  *      we don't refcount interfaces so this will also get split up.
 220  *
 221  *      Locking:
 222  *      The caller must not hold the IDE locks
 223  *      The drive present/vanishing is not yet properly locked
 224  *      Take care with the callbacks. These have been split to avoid
 225  *      deadlocking the IDE layer. The shutdown callback is called
 226  *      before we take the lock and free resources. It is up to the
 227  *      caller to be sure there is no pending I/O here, and that
 228  *      the interface will not be reopened (present/vanishing locking
 229  *      isn't yet done BTW). After we commit to the final kill we
 230  *      call the cleanup callback with the ide locks held.
 231  *
 232  *      Unregister restores the hwif structures to the default state.
 233  *      This is raving bonkers.
 234  */
 235
 236 void ide_unregister(ide_hwif_t *hwif)
 237 {
 238         ide_hwif_t *g;
 239         ide_hwgroup_t *hwgroup;
 240         int irq_count = 0;
 241
 242         BUG_ON(in_interrupt());
 243         BUG_ON(irqs_disabled());
 244
 245         mutex_lock(&ide_cfg_mtx);
 246
 247         spin_lock_irq(&ide_lock);
 248         if (hwif->present) {
 249                 __ide_port_unregister_devices(hwif);
 250                 hwif->present = 0;
 251         }
 252         spin_unlock_irq(&ide_lock);
 253
 254         ide_proc_unregister_port(hwif);
 255
 256         hwgroup = hwif->hwgroup;
 257         /*
 258          * free the irq if we were the only hwif using it
 259          */
 260         g = hwgroup->hwif;
 261         do {
 262                 if (g->irq == hwif->irq)
 263                         ++irq_count;
 264                 g = g->next;
 265         } while (g != hwgroup->hwif);
 266         if (irq_count == 1)
 267                 free_irq(hwif->irq, hwgroup);
 268
 269         ide_remove_port_from_hwgroup(hwif);
 270
 271         device_unregister(hwif->portdev);
 272         device_unregister(&hwif->gendev);
 273         wait_for_completion(&hwif->gendev_rel_comp);
 274
 275         /*
 276          * Remove us from the kernel's knowledge
 277          */
 278         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 279         kfree(hwif->sg_table);
 280         unregister_blkdev(hwif->major, hwif->name);
 281
 282         if (hwif->dma_base)
 283                 ide_release_dma_engine(hwif);
 284
 285         spin_lock_irq(&ide_lock);
 286         /* restore hwif data to pristine status */
 287         ide_init_port_data(hwif, hwif->index);
 288         spin_unlock_irq(&ide_lock);
 289
 290         mutex_unlock(&ide_cfg_mtx);
 291 }
 292
 293 EXPORT_SYMBOL(ide_unregister);
 294
 295 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
 296 {
 297         memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
 298         hwif->irq = hw->irq;
 299         hwif->chipset = hw->chipset;
 300         hwif->gendev.parent = hw->dev;
 301         hwif->ack_intr = hw->ack_intr;
 302 }
 303 EXPORT_SYMBOL_GPL(ide_init_port_hw);
 304
 305 /*
 306  *      Locks for IDE setting functionality
 307  */
 308
 309 DEFINE_MUTEX(ide_setting_mtx);
 310
 311 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 312
 313 /**
 314  *      ide_spin_wait_hwgroup   -       wait for group
 315  *      @drive: drive in the group
 316  *
 317  *      Wait for an IDE device group to go non busy and then return
 318  *      holding the ide_lock which guards the hwgroup->busy status
 319  *      and right to use it.
 320  */
 321
 322 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 323 {
 324         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 325         unsigned long timeout = jiffies + (3 * HZ);
 326
 327         spin_lock_irq(&ide_lock);
 328
 329         while (hwgroup->busy) {
 330                 unsigned long lflags;
 331                 spin_unlock_irq(&ide_lock);
 332                 local_irq_set(lflags);
 333                 if (time_after(jiffies, timeout)) {
 334                         local_irq_restore(lflags);
 335                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 336                         return -EBUSY;
 337                 }
 338                 local_irq_restore(lflags);
 339                 spin_lock_irq(&ide_lock);
 340         }
 341         return 0;
 342 }
 343
 344 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 345
 346 int set_io_32bit(ide_drive_t *drive, int arg)
 347 {
 348         if (drive->no_io_32bit)
 349                 return -EPERM;
 350
 351         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 352                 return -EINVAL;
 353
 354         if (ide_spin_wait_hwgroup(drive))
 355                 return -EBUSY;
 356
 357         drive->io_32bit = arg;
 358
 359         spin_unlock_irq(&ide_lock);
 360
 361         return 0;
 362 }
 363
 364 static int set_ksettings(ide_drive_t *drive, int arg)
 365 {
 366         if (arg < 0 || arg > 1)
 367                 return -EINVAL;
 368
 369         if (ide_spin_wait_hwgroup(drive))
 370                 return -EBUSY;
 371         drive->keep_settings = arg;
 372         spin_unlock_irq(&ide_lock);
 373
 374         return 0;
 375 }
 376
 377 int set_using_dma(ide_drive_t *drive, int arg)
 378 {
 379 #ifdef CONFIG_BLK_DEV_IDEDMA
 380         ide_hwif_t *hwif = drive->hwif;
 381         int err = -EPERM;
 382
 383         if (arg < 0 || arg > 1)
 384                 return -EINVAL;
 385
 386         if (!drive->id || !(drive->id->capability & 1))
 387                 goto out;
 388
 389         if (hwif->dma_ops == NULL)
 390                 goto out;
 391
 392         err = -EBUSY;
 393         if (ide_spin_wait_hwgroup(drive))
 394                 goto out;
 395         /*
 396          * set ->busy flag, unlock and let it ride
 397          */
 398         hwif->hwgroup->busy = 1;
 399         spin_unlock_irq(&ide_lock);
 400
 401         err = 0;
 402
 403         if (arg) {
 404                 if (ide_set_dma(drive))
 405                         err = -EIO;
 406         } else
 407                 ide_dma_off(drive);
 408
 409         /*
 410          * lock, clear ->busy flag and unlock before leaving
 411          */
 412         spin_lock_irq(&ide_lock);
 413         hwif->hwgroup->busy = 0;
 414         spin_unlock_irq(&ide_lock);
 415 out:
 416         return err;
 417 #else
 418         if (arg < 0 || arg > 1)
 419                 return -EINVAL;
 420
 421         return -EPERM;
 422 #endif
 423 }
 424
 425 int set_pio_mode(ide_drive_t *drive, int arg)
 426 {
 427         struct request *rq;
 428         ide_hwif_t *hwif = drive->hwif;
 429         const struct ide_port_ops *port_ops = hwif->port_ops;
 430
 431         if (arg < 0 || arg > 255)
 432                 return -EINVAL;
 433
 434         if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
 435             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
 436                 return -ENOSYS;
 437
 438         if (drive->special.b.set_tune)
 439                 return -EBUSY;
 440
 441         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 442         rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
 443
 444         drive->tune_req = (u8) arg;
 445         drive->special.b.set_tune = 1;
 446
 447         blk_execute_rq(drive->queue, NULL, rq, 0);
 448         blk_put_request(rq);
 449
 450         return 0;
 451 }
 452
 453 static int set_unmaskirq(ide_drive_t *drive, int arg)
 454 {
 455         if (drive->no_unmask)
 456                 return -EPERM;
 457
 458         if (arg < 0 || arg > 1)
 459                 return -EINVAL;
 460
 461         if (ide_spin_wait_hwgroup(drive))
 462                 return -EBUSY;
 463         drive->unmask = arg;
 464         spin_unlock_irq(&ide_lock);
 465
 466         return 0;
 467 }
 468
 469 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 470 {
 471         ide_drive_t *drive = dev->driver_data;
 472         ide_hwif_t *hwif = HWIF(drive);
 473         struct request *rq;
 474         struct request_pm_state rqpm;
 475         ide_task_t args;
 476         int ret;
 477
 478         /* Call ACPI _GTM only once */
 479         if (!(drive->dn % 2))
 480                 ide_acpi_get_timing(hwif);
 481
 482         memset(&rqpm, 0, sizeof(rqpm));
 483         memset(&args, 0, sizeof(args));
 484         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 485         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
 486         rq->special = &args;
 487         rq->data = &rqpm;
 488         rqpm.pm_step = ide_pm_state_start_suspend;
 489         if (mesg.event == PM_EVENT_PRETHAW)
 490                 mesg.event = PM_EVENT_FREEZE;
 491         rqpm.pm_state = mesg.event;
 492
 493         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
 494         blk_put_request(rq);
 495         /* only call ACPI _PS3 after both drivers are suspended */
 496         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 497                  && hwif->drives[1].present)
 498                  || !hwif->drives[0].present
 499                  || !hwif->drives[1].present))
 500                 ide_acpi_set_state(hwif, 0);
 501         return ret;
 502 }
 503
 504 static int generic_ide_resume(struct device *dev)
 505 {
 506         ide_drive_t *drive = dev->driver_data;
 507         ide_hwif_t *hwif = HWIF(drive);
 508         struct request *rq;
 509         struct request_pm_state rqpm;
 510         ide_task_t args;
 511         int err;
 512
 513         /* Call ACPI _STM only once */
 514         if (!(drive->dn % 2)) {
 515                 ide_acpi_set_state(hwif, 1);
 516                 ide_acpi_push_timing(hwif);
 517         }
 518
 519         ide_acpi_exec_tfs(drive);
 520
 521         memset(&rqpm, 0, sizeof(rqpm));
 522         memset(&args, 0, sizeof(args));
 523         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 524         rq->cmd_type = REQ_TYPE_PM_RESUME;
 525         rq->cmd_flags |= REQ_PREEMPT;
 526         rq->special = &args;
 527         rq->data = &rqpm;
 528         rqpm.pm_step = ide_pm_state_start_resume;
 529         rqpm.pm_state = PM_EVENT_ON;
 530
 531         err = blk_execute_rq(drive->queue, NULL, rq, 1);
 532         blk_put_request(rq);
 533
 534         if (err == 0 && dev->driver) {
 535                 ide_driver_t *drv = to_ide_driver(dev->driver);
 536
 537                 if (drv->resume)
 538                         drv->resume(drive);
 539         }
 540
 541         return err;
 542 }
 543
 544 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 545                         unsigned int cmd, unsigned long arg)
 546 {
 547         unsigned long flags;
 548         ide_driver_t *drv;
 549         void __user *p = (void __user *)arg;
 550         int err = 0, (*setfunc)(ide_drive_t *, int);
 551         u8 *val;
 552
 553         switch (cmd) {
 554         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
 555         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
 556         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
 557         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
 558         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
 559         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
 560         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
 561         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
 562         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
 563         }
 564
 565         switch (cmd) {
 566                 case HDIO_OBSOLETE_IDENTITY:
 567                 case HDIO_GET_IDENTITY:
 568                         if (bdev != bdev->bd_contains)
 569                                 return -EINVAL;
 570                         if (drive->id_read == 0)
 571                                 return -ENOMSG;
 572                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
 573                                 return -EFAULT;
 574                         return 0;
 575
 576                 case HDIO_GET_NICE:
 577                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
 578                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
 579                                         drive->nice1 << IDE_NICE_1,
 580                                         (long __user *) arg);
 581 #ifdef CONFIG_IDE_TASK_IOCTL
 582                 case HDIO_DRIVE_TASKFILE:
 583                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 584                                 return -EACCES;
 585                         switch(drive->media) {
 586                                 case ide_disk:
 587                                         return ide_taskfile_ioctl(drive, cmd, arg);
 588                                 default:
 589                                         return -ENOMSG;
 590                         }
 591 #endif /* CONFIG_IDE_TASK_IOCTL */
 592
 593                 case HDIO_DRIVE_CMD:
 594                         if (!capable(CAP_SYS_RAWIO))
 595                                 return -EACCES;
 596                         return ide_cmd_ioctl(drive, cmd, arg);
 597
 598                 case HDIO_DRIVE_TASK:
 599                         if (!capable(CAP_SYS_RAWIO))
 600                                 return -EACCES;
 601                         return ide_task_ioctl(drive, cmd, arg);
 602                 case HDIO_SET_NICE:
 603                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
 604                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
 605                                 return -EPERM;
 606                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
 607                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
 608                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
 609                                 drive->dsc_overlap = 0;
 610                                 return -EPERM;
 611                         }
 612                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
 613                         return 0;
 614                 case HDIO_DRIVE_RESET:
 615                         if (!capable(CAP_SYS_ADMIN))
 616                                 return -EACCES;
 617
 618                         /*
 619                          *      Abort the current command on the
 620                          *      group if there is one, taking
 621                          *      care not to allow anything else
 622                          *      to be queued and to die on the
 623                          *      spot if we miss one somehow
 624                          */
 625
 626                         spin_lock_irqsave(&ide_lock, flags);
 627
 628                         if (HWGROUP(drive)->resetting) {
 629                                 spin_unlock_irqrestore(&ide_lock, flags);
 630                                 return -EBUSY;
 631                         }
 632
 633                         ide_abort(drive, "drive reset");
 634
 635                         BUG_ON(HWGROUP(drive)->handler);
 636
 637                         /* Ensure nothing gets queued after we
 638                            drop the lock. Reset will clear the busy */
 639
 640                         HWGROUP(drive)->busy = 1;
 641                         spin_unlock_irqrestore(&ide_lock, flags);
 642                         (void) ide_do_reset(drive);
 643
 644                         return 0;
 645                 case HDIO_GET_BUSSTATE:
 646                         if (!capable(CAP_SYS_ADMIN))
 647                                 return -EACCES;
 648                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
 649                                 return -EFAULT;
 650                         return 0;
 651
 652                 case HDIO_SET_BUSSTATE:
 653                         if (!capable(CAP_SYS_ADMIN))
 654                                 return -EACCES;
 655                         return -EOPNOTSUPP;
 656                 default:
 657                         return -EINVAL;
 658         }
 659
 660 read_val:
 661         mutex_lock(&ide_setting_mtx);
 662         spin_lock_irqsave(&ide_lock, flags);
 663         err = *val;
 664         spin_unlock_irqrestore(&ide_lock, flags);
 665         mutex_unlock(&ide_setting_mtx);
 666         return err >= 0 ? put_user(err, (long __user *)arg) : err;
 667
 668 set_val:
 669         if (bdev != bdev->bd_contains)
 670                 err = -EINVAL;
 671         else {
 672                 if (!capable(CAP_SYS_ADMIN))
 673                         err = -EACCES;
 674                 else {
 675                         mutex_lock(&ide_setting_mtx);
 676                         err = setfunc(drive, arg);
 677                         mutex_unlock(&ide_setting_mtx);
 678                 }
 679         }
 680         return err;
 681 }
 682
 683 EXPORT_SYMBOL(generic_ide_ioctl);
 684
 685 static int ide_bus_match(struct device *dev, struct device_driver *drv)
 686 {
 687         return 1;
 688 }
 689
 690 static char *media_string(ide_drive_t *drive)
 691 {
 692         switch (drive->media) {
 693         case ide_disk:
 694                 return "disk";
 695         case ide_cdrom:
 696                 return "cdrom";
 697         case ide_tape:
 698                 return "tape";
 699         case ide_floppy:
 700                 return "floppy";
 701         case ide_optical:
 702                 return "optical";
 703         default:
 704                 return "UNKNOWN";
 705         }
 706 }
 707
 708 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
 709 {
 710         ide_drive_t *drive = to_ide_device(dev);
 711         return sprintf(buf, "%s\n", media_string(drive));
 712 }
 713
 714 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
 715 {
 716         ide_drive_t *drive = to_ide_device(dev);
 717         return sprintf(buf, "%s\n", drive->name);
 718 }
 719
 720 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 721 {
 722         ide_drive_t *drive = to_ide_device(dev);
 723         return sprintf(buf, "ide:m-%s\n", media_string(drive));
 724 }
 725
 726 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
 727                           char *buf)
 728 {
 729         ide_drive_t *drive = to_ide_device(dev);
 730         return sprintf(buf, "%s\n", drive->id->model);
 731 }
 732
 733 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
 734                              char *buf)
 735 {
 736         ide_drive_t *drive = to_ide_device(dev);
 737         return sprintf(buf, "%s\n", drive->id->fw_rev);
 738 }
 739
 740 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
 741                            char *buf)
 742 {
 743         ide_drive_t *drive = to_ide_device(dev);
 744         return sprintf(buf, "%s\n", drive->id->serial_no);
 745 }
 746
 747 static struct device_attribute ide_dev_attrs[] = {
 748         __ATTR_RO(media),
 749         __ATTR_RO(drivename),
 750         __ATTR_RO(modalias),
 751         __ATTR_RO(model),
 752         __ATTR_RO(firmware),
 753         __ATTR(serial, 0400, serial_show, NULL),
 754         __ATTR_NULL
 755 };
 756
 757 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
 758 {
 759         ide_drive_t *drive = to_ide_device(dev);
 760
 761         add_uevent_var(env, "MEDIA=%s", media_string(drive));
 762         add_uevent_var(env, "DRIVENAME=%s", drive->name);
 763         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
 764         return 0;
 765 }
 766
 767 static int generic_ide_probe(struct device *dev)
 768 {
 769         ide_drive_t *drive = to_ide_device(dev);
 770         ide_driver_t *drv = to_ide_driver(dev->driver);
 771
 772         return drv->probe ? drv->probe(drive) : -ENODEV;
 773 }
 774
 775 static int generic_ide_remove(struct device *dev)
 776 {
 777         ide_drive_t *drive = to_ide_device(dev);
 778         ide_driver_t *drv = to_ide_driver(dev->driver);
 779
 780         if (drv->remove)
 781                 drv->remove(drive);
 782
 783         return 0;
 784 }
 785
 786 static void generic_ide_shutdown(struct device *dev)
 787 {
 788         ide_drive_t *drive = to_ide_device(dev);
 789         ide_driver_t *drv = to_ide_driver(dev->driver);
 790
 791         if (dev->driver && drv->shutdown)
 792                 drv->shutdown(drive);
 793 }
 794
 795 struct bus_type ide_bus_type = {
 796         .name           = "ide",
 797         .match          = ide_bus_match,
 798         .uevent         = ide_uevent,
 799         .probe          = generic_ide_probe,
 800         .remove         = generic_ide_remove,
 801         .shutdown       = generic_ide_shutdown,
 802         .dev_attrs      = ide_dev_attrs,
 803         .suspend        = generic_ide_suspend,
 804         .resume         = generic_ide_resume,
 805 };
 806
 807 EXPORT_SYMBOL_GPL(ide_bus_type);
 808
 809 int ide_vlb_clk;
 810 EXPORT_SYMBOL_GPL(ide_vlb_clk);
 811
 812 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
 813 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
 814
 815 int ide_pci_clk;
 816 EXPORT_SYMBOL_GPL(ide_pci_clk);
 817
 818 module_param_named(pci_clock, ide_pci_clk, int, 0);
 819 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
 820
 821 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
 822 {
 823         int a, b, i, j = 1;
 824         unsigned int *dev_param_mask = (unsigned int *)kp->arg;
 825
 826         if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
 827             sscanf(s, "%d.%d", &a, &b) != 2)
 828                 return -EINVAL;
 829
 830         i = a * MAX_DRIVES + b;
 831
 832         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 833                 return -EINVAL;
 834
 835         if (j)
 836                 *dev_param_mask |= (1 << i);
 837         else
 838                 *dev_param_mask &= (1 << i);
 839
 840         return 0;
 841 }
 842
 843 static unsigned int ide_nodma;
 844
 845 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
 846 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
 847
 848 static unsigned int ide_noflush;
 849
 850 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
 851 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
 852
 853 static unsigned int ide_noprobe;
 854
 855 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
 856 MODULE_PARM_DESC(noprobe, "skip probing for a device");
 857
 858 static unsigned int ide_nowerr;
 859
 860 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
 861 MODULE_PARM_DESC(nowerr, "ignore the WRERR_STAT bit for a device");
 862
 863 static unsigned int ide_cdroms;
 864
 865 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
 866 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
 867
 868 struct chs_geom {
 869         unsigned int    cyl;
 870         u8              head;
 871         u8              sect;
 872 };
 873
 874 static unsigned int ide_disks;
 875 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
 876
 877 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
 878 {
 879         int a, b, c = 0, h = 0, s = 0, i, j = 1;
 880
 881         if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
 882             sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
 883                 return -EINVAL;
 884
 885         i = a * MAX_DRIVES + b;
 886
 887         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 888                 return -EINVAL;
 889
 890         if (c > INT_MAX || h > 255 || s > 255)
 891                 return -EINVAL;
 892
 893         if (j)
 894                 ide_disks |= (1 << i);
 895         else
 896                 ide_disks &= (1 << i);
 897
 898         ide_disks_chs[i].cyl  = c;
 899         ide_disks_chs[i].head = h;
 900         ide_disks_chs[i].sect = s;
 901
 902         return 0;
 903 }
 904
 905 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
 906 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
 907
 908 static void ide_dev_apply_params(ide_drive_t *drive)
 909 {
 910         int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;
 911
 912         if (ide_nodma & (1 << i)) {
 913                 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
 914                 drive->nodma = 1;
 915         }
 916         if (ide_noflush & (1 << i)) {
 917                 printk(KERN_INFO "ide: disabling flush requests for %s\n",
 918                                  drive->name);
 919                 drive->noflush = 1;
 920         }
 921         if (ide_noprobe & (1 << i)) {
 922                 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
 923                 drive->noprobe = 1;
 924         }
 925         if (ide_nowerr & (1 << i)) {
 926                 printk(KERN_INFO "ide: ignoring the WRERR_STAT bit for %s\n",
 927                                  drive->name);
 928                 drive->bad_wstat = BAD_R_STAT;
 929         }
 930         if (ide_cdroms & (1 << i)) {
 931                 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
 932                 drive->present = 1;
 933                 drive->media = ide_cdrom;
 934                 /* an ATAPI device ignores DRDY */
 935                 drive->ready_stat = 0;
 936         }
 937         if (ide_disks & (1 << i)) {
 938                 drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
 939                 drive->head = drive->bios_head = ide_disks_chs[i].head;
 940                 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
 941                 drive->forced_geom = 1;
 942                 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
 943                                  drive->name,
 944                                  drive->cyl, drive->head, drive->sect);
 945                 drive->present = 1;
 946                 drive->media = ide_disk;
 947                 drive->ready_stat = READY_STAT;
 948         }
 949 }
 950
 951 static unsigned int ide_ignore_cable;
 952
 953 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
 954 {
 955         int i, j = 1;
 956
 957         if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
 958                 return -EINVAL;
 959
 960         if (i >= MAX_HWIFS || j < 0 || j > 1)
 961                 return -EINVAL;
 962
 963         if (j)
 964                 ide_ignore_cable |= (1 << i);
 965         else
 966                 ide_ignore_cable &= (1 << i);
 967
 968         return 0;
 969 }
 970
 971 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
 972 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
 973
 974 void ide_port_apply_params(ide_hwif_t *hwif)
 975 {
 976         int i;
 977
 978         if (ide_ignore_cable & (1 << hwif->index)) {
 979                 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
 980                                  hwif->name);
 981                 hwif->cbl = ATA_CBL_PATA40_SHORT;
 982         }
 983
 984         for (i = 0; i < MAX_DRIVES; i++)
 985                 ide_dev_apply_params(&hwif->drives[i]);
 986 }
 987
 988 /*
 989  * This is gets invoked once during initialization, to set *everything* up
 990  */
 991 static int __init ide_init(void)
 992 {
 993         int ret;
 994
 995         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
 996
 997         ret = bus_register(&ide_bus_type);
 998         if (ret < 0) {
 999                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1000                 return ret;
1001         }
1002
1003         ide_port_class = class_create(THIS_MODULE, "ide_port");
1004         if (IS_ERR(ide_port_class)) {
1005                 ret = PTR_ERR(ide_port_class);
1006                 goto out_port_class;
1007         }
1008
1009         proc_ide_create();
1010
1011         return 0;
1012
1013 out_port_class:
1014         bus_unregister(&ide_bus_type);
1015
1016         return ret;
1017 }
1018
1019 static void __exit ide_exit(void)
1020 {
1021         proc_ide_destroy();
1022
1023         class_destroy(ide_port_class);
1024
1025         bus_unregister(&ide_bus_type);
1026 }
1027
1028 module_init(ide_init);
1029 module_exit(ide_exit);
1030
1031 MODULE_LICENSE("GPL");