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 ide_hwif_t ide_hwifs[MAX_HWIFS];        /* master data repository */
  95
  96 static void ide_port_init_devices_data(ide_hwif_t *);
  97
  98 /*
  99  * Do not even *think* about calling this!
 100  */
 101 void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
 102 {
 103         /* bulk initialize hwif & drive info with zeros */
 104         memset(hwif, 0, sizeof(ide_hwif_t));
 105
 106         /* fill in any non-zero initial values */
 107         hwif->index     = index;
 108         hwif->major     = ide_hwif_to_major[index];
 109
 110         hwif->name[0]   = 'i';
 111         hwif->name[1]   = 'd';
 112         hwif->name[2]   = 'e';
 113         hwif->name[3]   = '0' + index;
 114
 115         hwif->bus_state = BUSSTATE_ON;
 116
 117         init_completion(&hwif->gendev_rel_comp);
 118
 119         default_hwif_iops(hwif);
 120         default_hwif_transport(hwif);
 121
 122         ide_port_init_devices_data(hwif);
 123 }
 124
 125 static void ide_port_init_devices_data(ide_hwif_t *hwif)
 126 {
 127         int unit;
 128
 129         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 130                 ide_drive_t *drive = &hwif->drives[unit];
 131                 u8 j = (hwif->index * MAX_DRIVES) + unit;
 132
 133                 memset(drive, 0, sizeof(*drive));
 134
 135                 drive->media                    = ide_disk;
 136                 drive->select.all               = (unit<<4)|0xa0;
 137                 drive->hwif                     = hwif;
 138                 drive->ready_stat               = READY_STAT;
 139                 drive->bad_wstat                = BAD_W_STAT;
 140                 drive->special.b.recalibrate    = 1;
 141                 drive->special.b.set_geometry   = 1;
 142                 drive->name[0]                  = 'h';
 143                 drive->name[1]                  = 'd';
 144                 drive->name[2]                  = 'a' + j;
 145                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
 146
 147                 INIT_LIST_HEAD(&drive->list);
 148                 init_completion(&drive->gendev_rel_comp);
 149         }
 150 }
 151
 152 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
 153 {
 154         ide_hwgroup_t *hwgroup = hwif->hwgroup;
 155
 156         spin_lock_irq(&ide_lock);
 157         /*
 158          * Remove us from the hwgroup, and free
 159          * the hwgroup if we were the only member
 160          */
 161         if (hwif->next == hwif) {
 162                 BUG_ON(hwgroup->hwif != hwif);
 163                 kfree(hwgroup);
 164         } else {
 165                 /* There is another interface in hwgroup.
 166                  * Unlink us, and set hwgroup->drive and ->hwif to
 167                  * something sane.
 168                  */
 169                 ide_hwif_t *g = hwgroup->hwif;
 170
 171                 while (g->next != hwif)
 172                         g = g->next;
 173                 g->next = hwif->next;
 174                 if (hwgroup->hwif == hwif) {
 175                         /* Chose a random hwif for hwgroup->hwif.
 176                          * It's guaranteed that there are no drives
 177                          * left in the hwgroup.
 178                          */
 179                         BUG_ON(hwgroup->drive != NULL);
 180                         hwgroup->hwif = g;
 181                 }
 182                 BUG_ON(hwgroup->hwif == hwif);
 183         }
 184         spin_unlock_irq(&ide_lock);
 185 }
 186
 187 /* Called with ide_lock held. */
 188 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
 189 {
 190         int i;
 191
 192         for (i = 0; i < MAX_DRIVES; i++) {
 193                 ide_drive_t *drive = &hwif->drives[i];
 194
 195                 if (drive->present) {
 196                         spin_unlock_irq(&ide_lock);
 197                         device_unregister(&drive->gendev);
 198                         wait_for_completion(&drive->gendev_rel_comp);
 199                         spin_lock_irq(&ide_lock);
 200                 }
 201         }
 202 }
 203
 204 void ide_port_unregister_devices(ide_hwif_t *hwif)
 205 {
 206         mutex_lock(&ide_cfg_mtx);
 207         spin_lock_irq(&ide_lock);
 208         __ide_port_unregister_devices(hwif);
 209         hwif->present = 0;
 210         ide_port_init_devices_data(hwif);
 211         spin_unlock_irq(&ide_lock);
 212         mutex_unlock(&ide_cfg_mtx);
 213 }
 214 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
 215
 216 /**
 217  *      ide_unregister          -       free an IDE interface
 218  *      @hwif: IDE interface
 219  *
 220  *      Perform the final unregister of an IDE interface. At the moment
 221  *      we don't refcount interfaces so this will also get split up.
 222  *
 223  *      Locking:
 224  *      The caller must not hold the IDE locks
 225  *      The drive present/vanishing is not yet properly locked
 226  *      Take care with the callbacks. These have been split to avoid
 227  *      deadlocking the IDE layer. The shutdown callback is called
 228  *      before we take the lock and free resources. It is up to the
 229  *      caller to be sure there is no pending I/O here, and that
 230  *      the interface will not be reopened (present/vanishing locking
 231  *      isn't yet done BTW). After we commit to the final kill we
 232  *      call the cleanup callback with the ide locks held.
 233  *
 234  *      Unregister restores the hwif structures to the default state.
 235  *      This is raving bonkers.
 236  */
 237
 238 void ide_unregister(ide_hwif_t *hwif)
 239 {
 240         ide_hwif_t *g;
 241         ide_hwgroup_t *hwgroup;
 242         int irq_count = 0;
 243
 244         BUG_ON(in_interrupt());
 245         BUG_ON(irqs_disabled());
 246
 247         mutex_lock(&ide_cfg_mtx);
 248
 249         spin_lock_irq(&ide_lock);
 250         if (hwif->present) {
 251                 __ide_port_unregister_devices(hwif);
 252                 hwif->present = 0;
 253         }
 254         spin_unlock_irq(&ide_lock);
 255
 256         ide_proc_unregister_port(hwif);
 257
 258         hwgroup = hwif->hwgroup;
 259         /*
 260          * free the irq if we were the only hwif using it
 261          */
 262         g = hwgroup->hwif;
 263         do {
 264                 if (g->irq == hwif->irq)
 265                         ++irq_count;
 266                 g = g->next;
 267         } while (g != hwgroup->hwif);
 268         if (irq_count == 1)
 269                 free_irq(hwif->irq, hwgroup);
 270
 271         ide_remove_port_from_hwgroup(hwif);
 272
 273         device_unregister(hwif->portdev);
 274         device_unregister(&hwif->gendev);
 275         wait_for_completion(&hwif->gendev_rel_comp);
 276
 277         /*
 278          * Remove us from the kernel's knowledge
 279          */
 280         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 281         kfree(hwif->sg_table);
 282         unregister_blkdev(hwif->major, hwif->name);
 283
 284         if (hwif->dma_base)
 285                 ide_release_dma_engine(hwif);
 286
 287         spin_lock_irq(&ide_lock);
 288         /* restore hwif data to pristine status */
 289         ide_init_port_data(hwif, hwif->index);
 290         spin_unlock_irq(&ide_lock);
 291
 292         mutex_unlock(&ide_cfg_mtx);
 293 }
 294
 295 EXPORT_SYMBOL(ide_unregister);
 296
 297 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
 298 {
 299         memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
 300         hwif->irq = hw->irq;
 301         hwif->chipset = hw->chipset;
 302         hwif->gendev.parent = hw->dev;
 303         hwif->ack_intr = hw->ack_intr;
 304 }
 305 EXPORT_SYMBOL_GPL(ide_init_port_hw);
 306
 307 /*
 308  *      Locks for IDE setting functionality
 309  */
 310
 311 DEFINE_MUTEX(ide_setting_mtx);
 312
 313 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 314
 315 /**
 316  *      ide_spin_wait_hwgroup   -       wait for group
 317  *      @drive: drive in the group
 318  *
 319  *      Wait for an IDE device group to go non busy and then return
 320  *      holding the ide_lock which guards the hwgroup->busy status
 321  *      and right to use it.
 322  */
 323
 324 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 325 {
 326         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 327         unsigned long timeout = jiffies + (3 * HZ);
 328
 329         spin_lock_irq(&ide_lock);
 330
 331         while (hwgroup->busy) {
 332                 unsigned long lflags;
 333                 spin_unlock_irq(&ide_lock);
 334                 local_irq_set(lflags);
 335                 if (time_after(jiffies, timeout)) {
 336                         local_irq_restore(lflags);
 337                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 338                         return -EBUSY;
 339                 }
 340                 local_irq_restore(lflags);
 341                 spin_lock_irq(&ide_lock);
 342         }
 343         return 0;
 344 }
 345
 346 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 347
 348 int set_io_32bit(ide_drive_t *drive, int arg)
 349 {
 350         if (drive->no_io_32bit)
 351                 return -EPERM;
 352
 353         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 354                 return -EINVAL;
 355
 356         if (ide_spin_wait_hwgroup(drive))
 357                 return -EBUSY;
 358
 359         drive->io_32bit = arg;
 360
 361         spin_unlock_irq(&ide_lock);
 362
 363         return 0;
 364 }
 365
 366 static int set_ksettings(ide_drive_t *drive, int arg)
 367 {
 368         if (arg < 0 || arg > 1)
 369                 return -EINVAL;
 370
 371         if (ide_spin_wait_hwgroup(drive))
 372                 return -EBUSY;
 373         drive->keep_settings = arg;
 374         spin_unlock_irq(&ide_lock);
 375
 376         return 0;
 377 }
 378
 379 int set_using_dma(ide_drive_t *drive, int arg)
 380 {
 381 #ifdef CONFIG_BLK_DEV_IDEDMA
 382         ide_hwif_t *hwif = drive->hwif;
 383         int err = -EPERM;
 384
 385         if (arg < 0 || arg > 1)
 386                 return -EINVAL;
 387
 388         if (!drive->id || !(drive->id->capability & 1))
 389                 goto out;
 390
 391         if (hwif->dma_ops == NULL)
 392                 goto out;
 393
 394         err = -EBUSY;
 395         if (ide_spin_wait_hwgroup(drive))
 396                 goto out;
 397         /*
 398          * set ->busy flag, unlock and let it ride
 399          */
 400         hwif->hwgroup->busy = 1;
 401         spin_unlock_irq(&ide_lock);
 402
 403         err = 0;
 404
 405         if (arg) {
 406                 if (ide_set_dma(drive))
 407                         err = -EIO;
 408         } else
 409                 ide_dma_off(drive);
 410
 411         /*
 412          * lock, clear ->busy flag and unlock before leaving
 413          */
 414         spin_lock_irq(&ide_lock);
 415         hwif->hwgroup->busy = 0;
 416         spin_unlock_irq(&ide_lock);
 417 out:
 418         return err;
 419 #else
 420         if (arg < 0 || arg > 1)
 421                 return -EINVAL;
 422
 423         return -EPERM;
 424 #endif
 425 }
 426
 427 int set_pio_mode(ide_drive_t *drive, int arg)
 428 {
 429         struct request *rq;
 430         ide_hwif_t *hwif = drive->hwif;
 431         const struct ide_port_ops *port_ops = hwif->port_ops;
 432
 433         if (arg < 0 || arg > 255)
 434                 return -EINVAL;
 435
 436         if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
 437             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
 438                 return -ENOSYS;
 439
 440         if (drive->special.b.set_tune)
 441                 return -EBUSY;
 442
 443         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 444         rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
 445
 446         drive->tune_req = (u8) arg;
 447         drive->special.b.set_tune = 1;
 448
 449         blk_execute_rq(drive->queue, NULL, rq, 0);
 450         blk_put_request(rq);
 451
 452         return 0;
 453 }
 454
 455 static int set_unmaskirq(ide_drive_t *drive, int arg)
 456 {
 457         if (drive->no_unmask)
 458                 return -EPERM;
 459
 460         if (arg < 0 || arg > 1)
 461                 return -EINVAL;
 462
 463         if (ide_spin_wait_hwgroup(drive))
 464                 return -EBUSY;
 465         drive->unmask = arg;
 466         spin_unlock_irq(&ide_lock);
 467
 468         return 0;
 469 }
 470
 471 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 472 {
 473         ide_drive_t *drive = dev->driver_data;
 474         ide_hwif_t *hwif = HWIF(drive);
 475         struct request *rq;
 476         struct request_pm_state rqpm;
 477         ide_task_t args;
 478         int ret;
 479
 480         /* Call ACPI _GTM only once */
 481         if (!(drive->dn % 2))
 482                 ide_acpi_get_timing(hwif);
 483
 484         memset(&rqpm, 0, sizeof(rqpm));
 485         memset(&args, 0, sizeof(args));
 486         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 487         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
 488         rq->special = &args;
 489         rq->data = &rqpm;
 490         rqpm.pm_step = ide_pm_state_start_suspend;
 491         if (mesg.event == PM_EVENT_PRETHAW)
 492                 mesg.event = PM_EVENT_FREEZE;
 493         rqpm.pm_state = mesg.event;
 494
 495         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
 496         blk_put_request(rq);
 497         /* only call ACPI _PS3 after both drivers are suspended */
 498         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 499                  && hwif->drives[1].present)
 500                  || !hwif->drives[0].present
 501                  || !hwif->drives[1].present))
 502                 ide_acpi_set_state(hwif, 0);
 503         return ret;
 504 }
 505
 506 static int generic_ide_resume(struct device *dev)
 507 {
 508         ide_drive_t *drive = dev->driver_data;
 509         ide_hwif_t *hwif = HWIF(drive);
 510         struct request *rq;
 511         struct request_pm_state rqpm;
 512         ide_task_t args;
 513         int err;
 514
 515         /* Call ACPI _STM only once */
 516         if (!(drive->dn % 2)) {
 517                 ide_acpi_set_state(hwif, 1);
 518                 ide_acpi_push_timing(hwif);
 519         }
 520
 521         ide_acpi_exec_tfs(drive);
 522
 523         memset(&rqpm, 0, sizeof(rqpm));
 524         memset(&args, 0, sizeof(args));
 525         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 526         rq->cmd_type = REQ_TYPE_PM_RESUME;
 527         rq->cmd_flags |= REQ_PREEMPT;
 528         rq->special = &args;
 529         rq->data = &rqpm;
 530         rqpm.pm_step = ide_pm_state_start_resume;
 531         rqpm.pm_state = PM_EVENT_ON;
 532
 533         err = blk_execute_rq(drive->queue, NULL, rq, 1);
 534         blk_put_request(rq);
 535
 536         if (err == 0 && dev->driver) {
 537                 ide_driver_t *drv = to_ide_driver(dev->driver);
 538
 539                 if (drv->resume)
 540                         drv->resume(drive);
 541         }
 542
 543         return err;
 544 }
 545
 546 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 547                         unsigned int cmd, unsigned long arg)
 548 {
 549         unsigned long flags;
 550         ide_driver_t *drv;
 551         void __user *p = (void __user *)arg;
 552         int err = 0, (*setfunc)(ide_drive_t *, int);
 553         u8 *val;
 554
 555         switch (cmd) {
 556         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
 557         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
 558         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
 559         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
 560         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
 561         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
 562         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
 563         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
 564         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
 565         }
 566
 567         switch (cmd) {
 568                 case HDIO_OBSOLETE_IDENTITY:
 569                 case HDIO_GET_IDENTITY:
 570                         if (bdev != bdev->bd_contains)
 571                                 return -EINVAL;
 572                         if (drive->id_read == 0)
 573                                 return -ENOMSG;
 574                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
 575                                 return -EFAULT;
 576                         return 0;
 577
 578                 case HDIO_GET_NICE:
 579                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
 580                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
 581                                         drive->nice1 << IDE_NICE_1,
 582                                         (long __user *) arg);
 583 #ifdef CONFIG_IDE_TASK_IOCTL
 584                 case HDIO_DRIVE_TASKFILE:
 585                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 586                                 return -EACCES;
 587                         switch(drive->media) {
 588                                 case ide_disk:
 589                                         return ide_taskfile_ioctl(drive, cmd, arg);
 590                                 default:
 591                                         return -ENOMSG;
 592                         }
 593 #endif /* CONFIG_IDE_TASK_IOCTL */
 594
 595                 case HDIO_DRIVE_CMD:
 596                         if (!capable(CAP_SYS_RAWIO))
 597                                 return -EACCES;
 598                         return ide_cmd_ioctl(drive, cmd, arg);
 599
 600                 case HDIO_DRIVE_TASK:
 601                         if (!capable(CAP_SYS_RAWIO))
 602                                 return -EACCES;
 603                         return ide_task_ioctl(drive, cmd, arg);
 604                 case HDIO_SET_NICE:
 605                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
 606                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
 607                                 return -EPERM;
 608                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
 609                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
 610                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
 611                                 drive->dsc_overlap = 0;
 612                                 return -EPERM;
 613                         }
 614                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
 615                         return 0;
 616                 case HDIO_DRIVE_RESET:
 617                         if (!capable(CAP_SYS_ADMIN))
 618                                 return -EACCES;
 619
 620                         /*
 621                          *      Abort the current command on the
 622                          *      group if there is one, taking
 623                          *      care not to allow anything else
 624                          *      to be queued and to die on the
 625                          *      spot if we miss one somehow
 626                          */
 627
 628                         spin_lock_irqsave(&ide_lock, flags);
 629
 630                         if (HWGROUP(drive)->resetting) {
 631                                 spin_unlock_irqrestore(&ide_lock, flags);
 632                                 return -EBUSY;
 633                         }
 634
 635                         ide_abort(drive, "drive reset");
 636
 637                         BUG_ON(HWGROUP(drive)->handler);
 638
 639                         /* Ensure nothing gets queued after we
 640                            drop the lock. Reset will clear the busy */
 641
 642                         HWGROUP(drive)->busy = 1;
 643                         spin_unlock_irqrestore(&ide_lock, flags);
 644                         (void) ide_do_reset(drive);
 645
 646                         return 0;
 647                 case HDIO_GET_BUSSTATE:
 648                         if (!capable(CAP_SYS_ADMIN))
 649                                 return -EACCES;
 650                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
 651                                 return -EFAULT;
 652                         return 0;
 653
 654                 case HDIO_SET_BUSSTATE:
 655                         if (!capable(CAP_SYS_ADMIN))
 656                                 return -EACCES;
 657                         return -EOPNOTSUPP;
 658                 default:
 659                         return -EINVAL;
 660         }
 661
 662 read_val:
 663         mutex_lock(&ide_setting_mtx);
 664         spin_lock_irqsave(&ide_lock, flags);
 665         err = *val;
 666         spin_unlock_irqrestore(&ide_lock, flags);
 667         mutex_unlock(&ide_setting_mtx);
 668         return err >= 0 ? put_user(err, (long __user *)arg) : err;
 669
 670 set_val:
 671         if (bdev != bdev->bd_contains)
 672                 err = -EINVAL;
 673         else {
 674                 if (!capable(CAP_SYS_ADMIN))
 675                         err = -EACCES;
 676                 else {
 677                         mutex_lock(&ide_setting_mtx);
 678                         err = setfunc(drive, arg);
 679                         mutex_unlock(&ide_setting_mtx);
 680                 }
 681         }
 682         return err;
 683 }
 684
 685 EXPORT_SYMBOL(generic_ide_ioctl);
 686
 687 static int ide_bus_match(struct device *dev, struct device_driver *drv)
 688 {
 689         return 1;
 690 }
 691
 692 static char *media_string(ide_drive_t *drive)
 693 {
 694         switch (drive->media) {
 695         case ide_disk:
 696                 return "disk";
 697         case ide_cdrom:
 698                 return "cdrom";
 699         case ide_tape:
 700                 return "tape";
 701         case ide_floppy:
 702                 return "floppy";
 703         case ide_optical:
 704                 return "optical";
 705         default:
 706                 return "UNKNOWN";
 707         }
 708 }
 709
 710 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
 711 {
 712         ide_drive_t *drive = to_ide_device(dev);
 713         return sprintf(buf, "%s\n", media_string(drive));
 714 }
 715
 716 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
 717 {
 718         ide_drive_t *drive = to_ide_device(dev);
 719         return sprintf(buf, "%s\n", drive->name);
 720 }
 721
 722 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 723 {
 724         ide_drive_t *drive = to_ide_device(dev);
 725         return sprintf(buf, "ide:m-%s\n", media_string(drive));
 726 }
 727
 728 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
 729                           char *buf)
 730 {
 731         ide_drive_t *drive = to_ide_device(dev);
 732         return sprintf(buf, "%s\n", drive->id->model);
 733 }
 734
 735 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
 736                              char *buf)
 737 {
 738         ide_drive_t *drive = to_ide_device(dev);
 739         return sprintf(buf, "%s\n", drive->id->fw_rev);
 740 }
 741
 742 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
 743                            char *buf)
 744 {
 745         ide_drive_t *drive = to_ide_device(dev);
 746         return sprintf(buf, "%s\n", drive->id->serial_no);
 747 }
 748
 749 static struct device_attribute ide_dev_attrs[] = {
 750         __ATTR_RO(media),
 751         __ATTR_RO(drivename),
 752         __ATTR_RO(modalias),
 753         __ATTR_RO(model),
 754         __ATTR_RO(firmware),
 755         __ATTR(serial, 0400, serial_show, NULL),
 756         __ATTR_NULL
 757 };
 758
 759 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
 760 {
 761         ide_drive_t *drive = to_ide_device(dev);
 762
 763         add_uevent_var(env, "MEDIA=%s", media_string(drive));
 764         add_uevent_var(env, "DRIVENAME=%s", drive->name);
 765         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
 766         return 0;
 767 }
 768
 769 static int generic_ide_probe(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         return drv->probe ? drv->probe(drive) : -ENODEV;
 775 }
 776
 777 static int generic_ide_remove(struct device *dev)
 778 {
 779         ide_drive_t *drive = to_ide_device(dev);
 780         ide_driver_t *drv = to_ide_driver(dev->driver);
 781
 782         if (drv->remove)
 783                 drv->remove(drive);
 784
 785         return 0;
 786 }
 787
 788 static void generic_ide_shutdown(struct device *dev)
 789 {
 790         ide_drive_t *drive = to_ide_device(dev);
 791         ide_driver_t *drv = to_ide_driver(dev->driver);
 792
 793         if (dev->driver && drv->shutdown)
 794                 drv->shutdown(drive);
 795 }
 796
 797 struct bus_type ide_bus_type = {
 798         .name           = "ide",
 799         .match          = ide_bus_match,
 800         .uevent         = ide_uevent,
 801         .probe          = generic_ide_probe,
 802         .remove         = generic_ide_remove,
 803         .shutdown       = generic_ide_shutdown,
 804         .dev_attrs      = ide_dev_attrs,
 805         .suspend        = generic_ide_suspend,
 806         .resume         = generic_ide_resume,
 807 };
 808
 809 EXPORT_SYMBOL_GPL(ide_bus_type);
 810
 811 int ide_vlb_clk;
 812 EXPORT_SYMBOL_GPL(ide_vlb_clk);
 813
 814 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
 815 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
 816
 817 int ide_pci_clk;
 818 EXPORT_SYMBOL_GPL(ide_pci_clk);
 819
 820 module_param_named(pci_clock, ide_pci_clk, int, 0);
 821 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
 822
 823 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
 824 {
 825         int a, b, i, j = 1;
 826         unsigned int *dev_param_mask = (unsigned int *)kp->arg;
 827
 828         if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
 829             sscanf(s, "%d.%d", &a, &b) != 2)
 830                 return -EINVAL;
 831
 832         i = a * MAX_DRIVES + b;
 833
 834         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 835                 return -EINVAL;
 836
 837         if (j)
 838                 *dev_param_mask |= (1 << i);
 839         else
 840                 *dev_param_mask &= (1 << i);
 841
 842         return 0;
 843 }
 844
 845 static unsigned int ide_nodma;
 846
 847 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
 848 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
 849
 850 static unsigned int ide_noflush;
 851
 852 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
 853 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
 854
 855 static unsigned int ide_noprobe;
 856
 857 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
 858 MODULE_PARM_DESC(noprobe, "skip probing for a device");
 859
 860 static unsigned int ide_nowerr;
 861
 862 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
 863 MODULE_PARM_DESC(nowerr, "ignore the WRERR_STAT bit for a device");
 864
 865 static unsigned int ide_cdroms;
 866
 867 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
 868 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
 869
 870 struct chs_geom {
 871         unsigned int    cyl;
 872         u8              head;
 873         u8              sect;
 874 };
 875
 876 static unsigned int ide_disks;
 877 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
 878
 879 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
 880 {
 881         int a, b, c = 0, h = 0, s = 0, i, j = 1;
 882
 883         if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
 884             sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
 885                 return -EINVAL;
 886
 887         i = a * MAX_DRIVES + b;
 888
 889         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 890                 return -EINVAL;
 891
 892         if (c > INT_MAX || h > 255 || s > 255)
 893                 return -EINVAL;
 894
 895         if (j)
 896                 ide_disks |= (1 << i);
 897         else
 898                 ide_disks &= (1 << i);
 899
 900         ide_disks_chs[i].cyl  = c;
 901         ide_disks_chs[i].head = h;
 902         ide_disks_chs[i].sect = s;
 903
 904         return 0;
 905 }
 906
 907 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
 908 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
 909
 910 static void ide_dev_apply_params(ide_drive_t *drive)
 911 {
 912         int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;
 913
 914         if (ide_nodma & (1 << i)) {
 915                 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
 916                 drive->nodma = 1;
 917         }
 918         if (ide_noflush & (1 << i)) {
 919                 printk(KERN_INFO "ide: disabling flush requests for %s\n",
 920                                  drive->name);
 921                 drive->noflush = 1;
 922         }
 923         if (ide_noprobe & (1 << i)) {
 924                 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
 925                 drive->noprobe = 1;
 926         }
 927         if (ide_nowerr & (1 << i)) {
 928                 printk(KERN_INFO "ide: ignoring the WRERR_STAT bit for %s\n",
 929                                  drive->name);
 930                 drive->bad_wstat = BAD_R_STAT;
 931         }
 932         if (ide_cdroms & (1 << i)) {
 933                 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
 934                 drive->present = 1;
 935                 drive->media = ide_cdrom;
 936                 /* an ATAPI device ignores DRDY */
 937                 drive->ready_stat = 0;
 938         }
 939         if (ide_disks & (1 << i)) {
 940                 drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
 941                 drive->head = drive->bios_head = ide_disks_chs[i].head;
 942                 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
 943                 drive->forced_geom = 1;
 944                 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
 945                                  drive->name,
 946                                  drive->cyl, drive->head, drive->sect);
 947                 drive->present = 1;
 948                 drive->media = ide_disk;
 949                 drive->ready_stat = READY_STAT;
 950         }
 951 }
 952
 953 static unsigned int ide_ignore_cable;
 954
 955 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
 956 {
 957         int i, j = 1;
 958
 959         if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
 960                 return -EINVAL;
 961
 962         if (i >= MAX_HWIFS || j < 0 || j > 1)
 963                 return -EINVAL;
 964
 965         if (j)
 966                 ide_ignore_cable |= (1 << i);
 967         else
 968                 ide_ignore_cable &= (1 << i);
 969
 970         return 0;
 971 }
 972
 973 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
 974 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
 975
 976 void ide_port_apply_params(ide_hwif_t *hwif)
 977 {
 978         int i;
 979
 980         if (ide_ignore_cable & (1 << hwif->index)) {
 981                 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
 982                                  hwif->name);
 983                 hwif->cbl = ATA_CBL_PATA40_SHORT;
 984         }
 985
 986         for (i = 0; i < MAX_DRIVES; i++)
 987                 ide_dev_apply_params(&hwif->drives[i]);
 988 }
 989
 990 /*
 991  * This is gets invoked once during initialization, to set *everything* up
 992  */
 993 static int __init ide_init(void)
 994 {
 995         int ret;
 996
 997         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
 998
 999         ret = bus_register(&ide_bus_type);
1000         if (ret < 0) {
1001                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1002                 return ret;
1003         }
1004
1005         ide_port_class = class_create(THIS_MODULE, "ide_port");
1006         if (IS_ERR(ide_port_class)) {
1007                 ret = PTR_ERR(ide_port_class);
1008                 goto out_port_class;
1009         }
1010
1011         proc_ide_create();
1012
1013         return 0;
1014
1015 out_port_class:
1016         bus_unregister(&ide_bus_type);
1017
1018         return ret;
1019 }
1020
1021 static void __exit ide_exit(void)
1022 {
1023         proc_ide_destroy();
1024
1025         class_destroy(ide_port_class);
1026
1027         bus_unregister(&ide_bus_type);
1028 }
1029
1030 module_init(ide_init);
1031 module_exit(ide_exit);
1032
1033 MODULE_LICENSE("GPL");