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 EXPORT_SYMBOL_GPL(ide_init_port_data);
 125
 126 static void ide_port_init_devices_data(ide_hwif_t *hwif)
 127 {
 128         int unit;
 129
 130         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 131                 ide_drive_t *drive = &hwif->drives[unit];
 132                 u8 j = (hwif->index * MAX_DRIVES) + unit;
 133
 134                 memset(drive, 0, sizeof(*drive));
 135
 136                 drive->media                    = ide_disk;
 137                 drive->select.all               = (unit<<4)|0xa0;
 138                 drive->hwif                     = hwif;
 139                 drive->ready_stat               = READY_STAT;
 140                 drive->bad_wstat                = BAD_W_STAT;
 141                 drive->special.b.recalibrate    = 1;
 142                 drive->special.b.set_geometry   = 1;
 143                 drive->name[0]                  = 'h';
 144                 drive->name[1]                  = 'd';
 145                 drive->name[2]                  = 'a' + j;
 146                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
 147
 148                 INIT_LIST_HEAD(&drive->list);
 149                 init_completion(&drive->gendev_rel_comp);
 150         }
 151 }
 152
 153 static void __init init_ide_data (void)
 154 {
 155         unsigned int index;
 156
 157         /* Initialise all interface structures */
 158         for (index = 0; index < MAX_HWIFS; ++index) {
 159                 ide_hwif_t *hwif = &ide_hwifs[index];
 160
 161                 ide_init_port_data(hwif, index);
 162         }
 163 }
 164
 165 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
 166 {
 167         ide_hwgroup_t *hwgroup = hwif->hwgroup;
 168
 169         spin_lock_irq(&ide_lock);
 170         /*
 171          * Remove us from the hwgroup, and free
 172          * the hwgroup if we were the only member
 173          */
 174         if (hwif->next == hwif) {
 175                 BUG_ON(hwgroup->hwif != hwif);
 176                 kfree(hwgroup);
 177         } else {
 178                 /* There is another interface in hwgroup.
 179                  * Unlink us, and set hwgroup->drive and ->hwif to
 180                  * something sane.
 181                  */
 182                 ide_hwif_t *g = hwgroup->hwif;
 183
 184                 while (g->next != hwif)
 185                         g = g->next;
 186                 g->next = hwif->next;
 187                 if (hwgroup->hwif == hwif) {
 188                         /* Chose a random hwif for hwgroup->hwif.
 189                          * It's guaranteed that there are no drives
 190                          * left in the hwgroup.
 191                          */
 192                         BUG_ON(hwgroup->drive != NULL);
 193                         hwgroup->hwif = g;
 194                 }
 195                 BUG_ON(hwgroup->hwif == hwif);
 196         }
 197         spin_unlock_irq(&ide_lock);
 198 }
 199
 200 /* Called with ide_lock held. */
 201 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
 202 {
 203         int i;
 204
 205         for (i = 0; i < MAX_DRIVES; i++) {
 206                 ide_drive_t *drive = &hwif->drives[i];
 207
 208                 if (drive->present) {
 209                         spin_unlock_irq(&ide_lock);
 210                         device_unregister(&drive->gendev);
 211                         wait_for_completion(&drive->gendev_rel_comp);
 212                         spin_lock_irq(&ide_lock);
 213                 }
 214         }
 215 }
 216
 217 void ide_port_unregister_devices(ide_hwif_t *hwif)
 218 {
 219         mutex_lock(&ide_cfg_mtx);
 220         spin_lock_irq(&ide_lock);
 221         __ide_port_unregister_devices(hwif);
 222         hwif->present = 0;
 223         ide_port_init_devices_data(hwif);
 224         spin_unlock_irq(&ide_lock);
 225         mutex_unlock(&ide_cfg_mtx);
 226 }
 227 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
 228
 229 /**
 230  *      ide_unregister          -       free an IDE interface
 231  *      @hwif: IDE interface
 232  *
 233  *      Perform the final unregister of an IDE interface. At the moment
 234  *      we don't refcount interfaces so this will also get split up.
 235  *
 236  *      Locking:
 237  *      The caller must not hold the IDE locks
 238  *      The drive present/vanishing is not yet properly locked
 239  *      Take care with the callbacks. These have been split to avoid
 240  *      deadlocking the IDE layer. The shutdown callback is called
 241  *      before we take the lock and free resources. It is up to the
 242  *      caller to be sure there is no pending I/O here, and that
 243  *      the interface will not be reopened (present/vanishing locking
 244  *      isn't yet done BTW). After we commit to the final kill we
 245  *      call the cleanup callback with the ide locks held.
 246  *
 247  *      Unregister restores the hwif structures to the default state.
 248  *      This is raving bonkers.
 249  */
 250
 251 void ide_unregister(ide_hwif_t *hwif)
 252 {
 253         ide_hwif_t *g;
 254         ide_hwgroup_t *hwgroup;
 255         int irq_count = 0;
 256
 257         BUG_ON(in_interrupt());
 258         BUG_ON(irqs_disabled());
 259
 260         mutex_lock(&ide_cfg_mtx);
 261
 262         spin_lock_irq(&ide_lock);
 263         if (hwif->present) {
 264                 __ide_port_unregister_devices(hwif);
 265                 hwif->present = 0;
 266         }
 267         spin_unlock_irq(&ide_lock);
 268
 269         ide_proc_unregister_port(hwif);
 270
 271         hwgroup = hwif->hwgroup;
 272         /*
 273          * free the irq if we were the only hwif using it
 274          */
 275         g = hwgroup->hwif;
 276         do {
 277                 if (g->irq == hwif->irq)
 278                         ++irq_count;
 279                 g = g->next;
 280         } while (g != hwgroup->hwif);
 281         if (irq_count == 1)
 282                 free_irq(hwif->irq, hwgroup);
 283
 284         ide_remove_port_from_hwgroup(hwif);
 285
 286         device_unregister(hwif->portdev);
 287         device_unregister(&hwif->gendev);
 288         wait_for_completion(&hwif->gendev_rel_comp);
 289
 290         /*
 291          * Remove us from the kernel's knowledge
 292          */
 293         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 294         kfree(hwif->sg_table);
 295         unregister_blkdev(hwif->major, hwif->name);
 296
 297         if (hwif->dma_base)
 298                 ide_release_dma_engine(hwif);
 299
 300         spin_lock_irq(&ide_lock);
 301         /* restore hwif data to pristine status */
 302         ide_init_port_data(hwif, hwif->index);
 303         spin_unlock_irq(&ide_lock);
 304
 305         mutex_unlock(&ide_cfg_mtx);
 306 }
 307
 308 EXPORT_SYMBOL(ide_unregister);
 309
 310 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
 311 {
 312         memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
 313         hwif->irq = hw->irq;
 314         hwif->chipset = hw->chipset;
 315         hwif->gendev.parent = hw->dev;
 316         hwif->ack_intr = hw->ack_intr;
 317 }
 318 EXPORT_SYMBOL_GPL(ide_init_port_hw);
 319
 320 /*
 321  *      Locks for IDE setting functionality
 322  */
 323
 324 DEFINE_MUTEX(ide_setting_mtx);
 325
 326 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 327
 328 /**
 329  *      ide_spin_wait_hwgroup   -       wait for group
 330  *      @drive: drive in the group
 331  *
 332  *      Wait for an IDE device group to go non busy and then return
 333  *      holding the ide_lock which guards the hwgroup->busy status
 334  *      and right to use it.
 335  */
 336
 337 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 338 {
 339         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 340         unsigned long timeout = jiffies + (3 * HZ);
 341
 342         spin_lock_irq(&ide_lock);
 343
 344         while (hwgroup->busy) {
 345                 unsigned long lflags;
 346                 spin_unlock_irq(&ide_lock);
 347                 local_irq_set(lflags);
 348                 if (time_after(jiffies, timeout)) {
 349                         local_irq_restore(lflags);
 350                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 351                         return -EBUSY;
 352                 }
 353                 local_irq_restore(lflags);
 354                 spin_lock_irq(&ide_lock);
 355         }
 356         return 0;
 357 }
 358
 359 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 360
 361 int set_io_32bit(ide_drive_t *drive, int arg)
 362 {
 363         if (drive->no_io_32bit)
 364                 return -EPERM;
 365
 366         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 367                 return -EINVAL;
 368
 369         if (ide_spin_wait_hwgroup(drive))
 370                 return -EBUSY;
 371
 372         drive->io_32bit = arg;
 373
 374         spin_unlock_irq(&ide_lock);
 375
 376         return 0;
 377 }
 378
 379 static int set_ksettings(ide_drive_t *drive, int arg)
 380 {
 381         if (arg < 0 || arg > 1)
 382                 return -EINVAL;
 383
 384         if (ide_spin_wait_hwgroup(drive))
 385                 return -EBUSY;
 386         drive->keep_settings = arg;
 387         spin_unlock_irq(&ide_lock);
 388
 389         return 0;
 390 }
 391
 392 int set_using_dma(ide_drive_t *drive, int arg)
 393 {
 394 #ifdef CONFIG_BLK_DEV_IDEDMA
 395         ide_hwif_t *hwif = drive->hwif;
 396         int err = -EPERM;
 397
 398         if (arg < 0 || arg > 1)
 399                 return -EINVAL;
 400
 401         if (!drive->id || !(drive->id->capability & 1))
 402                 goto out;
 403
 404         if (hwif->dma_ops == NULL)
 405                 goto out;
 406
 407         err = -EBUSY;
 408         if (ide_spin_wait_hwgroup(drive))
 409                 goto out;
 410         /*
 411          * set ->busy flag, unlock and let it ride
 412          */
 413         hwif->hwgroup->busy = 1;
 414         spin_unlock_irq(&ide_lock);
 415
 416         err = 0;
 417
 418         if (arg) {
 419                 if (ide_set_dma(drive))
 420                         err = -EIO;
 421         } else
 422                 ide_dma_off(drive);
 423
 424         /*
 425          * lock, clear ->busy flag and unlock before leaving
 426          */
 427         spin_lock_irq(&ide_lock);
 428         hwif->hwgroup->busy = 0;
 429         spin_unlock_irq(&ide_lock);
 430 out:
 431         return err;
 432 #else
 433         if (arg < 0 || arg > 1)
 434                 return -EINVAL;
 435
 436         return -EPERM;
 437 #endif
 438 }
 439
 440 int set_pio_mode(ide_drive_t *drive, int arg)
 441 {
 442         struct request *rq;
 443         ide_hwif_t *hwif = drive->hwif;
 444         const struct ide_port_ops *port_ops = hwif->port_ops;
 445
 446         if (arg < 0 || arg > 255)
 447                 return -EINVAL;
 448
 449         if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
 450             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
 451                 return -ENOSYS;
 452
 453         if (drive->special.b.set_tune)
 454                 return -EBUSY;
 455
 456         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 457         rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
 458
 459         drive->tune_req = (u8) arg;
 460         drive->special.b.set_tune = 1;
 461
 462         blk_execute_rq(drive->queue, NULL, rq, 0);
 463         blk_put_request(rq);
 464
 465         return 0;
 466 }
 467
 468 static int set_unmaskirq(ide_drive_t *drive, int arg)
 469 {
 470         if (drive->no_unmask)
 471                 return -EPERM;
 472
 473         if (arg < 0 || arg > 1)
 474                 return -EINVAL;
 475
 476         if (ide_spin_wait_hwgroup(drive))
 477                 return -EBUSY;
 478         drive->unmask = arg;
 479         spin_unlock_irq(&ide_lock);
 480
 481         return 0;
 482 }
 483
 484 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 485 {
 486         ide_drive_t *drive = dev->driver_data;
 487         ide_hwif_t *hwif = HWIF(drive);
 488         struct request *rq;
 489         struct request_pm_state rqpm;
 490         ide_task_t args;
 491         int ret;
 492
 493         /* Call ACPI _GTM only once */
 494         if (!(drive->dn % 2))
 495                 ide_acpi_get_timing(hwif);
 496
 497         memset(&rqpm, 0, sizeof(rqpm));
 498         memset(&args, 0, sizeof(args));
 499         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 500         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
 501         rq->special = &args;
 502         rq->data = &rqpm;
 503         rqpm.pm_step = ide_pm_state_start_suspend;
 504         if (mesg.event == PM_EVENT_PRETHAW)
 505                 mesg.event = PM_EVENT_FREEZE;
 506         rqpm.pm_state = mesg.event;
 507
 508         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
 509         blk_put_request(rq);
 510         /* only call ACPI _PS3 after both drivers are suspended */
 511         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 512                  && hwif->drives[1].present)
 513                  || !hwif->drives[0].present
 514                  || !hwif->drives[1].present))
 515                 ide_acpi_set_state(hwif, 0);
 516         return ret;
 517 }
 518
 519 static int generic_ide_resume(struct device *dev)
 520 {
 521         ide_drive_t *drive = dev->driver_data;
 522         ide_hwif_t *hwif = HWIF(drive);
 523         struct request *rq;
 524         struct request_pm_state rqpm;
 525         ide_task_t args;
 526         int err;
 527
 528         /* Call ACPI _STM only once */
 529         if (!(drive->dn % 2)) {
 530                 ide_acpi_set_state(hwif, 1);
 531                 ide_acpi_push_timing(hwif);
 532         }
 533
 534         ide_acpi_exec_tfs(drive);
 535
 536         memset(&rqpm, 0, sizeof(rqpm));
 537         memset(&args, 0, sizeof(args));
 538         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 539         rq->cmd_type = REQ_TYPE_PM_RESUME;
 540         rq->cmd_flags |= REQ_PREEMPT;
 541         rq->special = &args;
 542         rq->data = &rqpm;
 543         rqpm.pm_step = ide_pm_state_start_resume;
 544         rqpm.pm_state = PM_EVENT_ON;
 545
 546         err = blk_execute_rq(drive->queue, NULL, rq, 1);
 547         blk_put_request(rq);
 548
 549         if (err == 0 && dev->driver) {
 550                 ide_driver_t *drv = to_ide_driver(dev->driver);
 551
 552                 if (drv->resume)
 553                         drv->resume(drive);
 554         }
 555
 556         return err;
 557 }
 558
 559 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 560                         unsigned int cmd, unsigned long arg)
 561 {
 562         unsigned long flags;
 563         ide_driver_t *drv;
 564         void __user *p = (void __user *)arg;
 565         int err = 0, (*setfunc)(ide_drive_t *, int);
 566         u8 *val;
 567
 568         switch (cmd) {
 569         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
 570         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
 571         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
 572         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
 573         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
 574         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
 575         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
 576         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
 577         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
 578         }
 579
 580         switch (cmd) {
 581                 case HDIO_OBSOLETE_IDENTITY:
 582                 case HDIO_GET_IDENTITY:
 583                         if (bdev != bdev->bd_contains)
 584                                 return -EINVAL;
 585                         if (drive->id_read == 0)
 586                                 return -ENOMSG;
 587                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
 588                                 return -EFAULT;
 589                         return 0;
 590
 591                 case HDIO_GET_NICE:
 592                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
 593                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
 594                                         drive->nice1 << IDE_NICE_1,
 595                                         (long __user *) arg);
 596 #ifdef CONFIG_IDE_TASK_IOCTL
 597                 case HDIO_DRIVE_TASKFILE:
 598                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 599                                 return -EACCES;
 600                         switch(drive->media) {
 601                                 case ide_disk:
 602                                         return ide_taskfile_ioctl(drive, cmd, arg);
 603                                 default:
 604                                         return -ENOMSG;
 605                         }
 606 #endif /* CONFIG_IDE_TASK_IOCTL */
 607
 608                 case HDIO_DRIVE_CMD:
 609                         if (!capable(CAP_SYS_RAWIO))
 610                                 return -EACCES;
 611                         return ide_cmd_ioctl(drive, cmd, arg);
 612
 613                 case HDIO_DRIVE_TASK:
 614                         if (!capable(CAP_SYS_RAWIO))
 615                                 return -EACCES;
 616                         return ide_task_ioctl(drive, cmd, arg);
 617                 case HDIO_SET_NICE:
 618                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
 619                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
 620                                 return -EPERM;
 621                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
 622                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
 623                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
 624                                 drive->dsc_overlap = 0;
 625                                 return -EPERM;
 626                         }
 627                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
 628                         return 0;
 629                 case HDIO_DRIVE_RESET:
 630                         if (!capable(CAP_SYS_ADMIN))
 631                                 return -EACCES;
 632
 633                         /*
 634                          *      Abort the current command on the
 635                          *      group if there is one, taking
 636                          *      care not to allow anything else
 637                          *      to be queued and to die on the
 638                          *      spot if we miss one somehow
 639                          */
 640
 641                         spin_lock_irqsave(&ide_lock, flags);
 642
 643                         if (HWGROUP(drive)->resetting) {
 644                                 spin_unlock_irqrestore(&ide_lock, flags);
 645                                 return -EBUSY;
 646                         }
 647
 648                         ide_abort(drive, "drive reset");
 649
 650                         BUG_ON(HWGROUP(drive)->handler);
 651
 652                         /* Ensure nothing gets queued after we
 653                            drop the lock. Reset will clear the busy */
 654
 655                         HWGROUP(drive)->busy = 1;
 656                         spin_unlock_irqrestore(&ide_lock, flags);
 657                         (void) ide_do_reset(drive);
 658
 659                         return 0;
 660                 case HDIO_GET_BUSSTATE:
 661                         if (!capable(CAP_SYS_ADMIN))
 662                                 return -EACCES;
 663                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
 664                                 return -EFAULT;
 665                         return 0;
 666
 667                 case HDIO_SET_BUSSTATE:
 668                         if (!capable(CAP_SYS_ADMIN))
 669                                 return -EACCES;
 670                         return -EOPNOTSUPP;
 671                 default:
 672                         return -EINVAL;
 673         }
 674
 675 read_val:
 676         mutex_lock(&ide_setting_mtx);
 677         spin_lock_irqsave(&ide_lock, flags);
 678         err = *val;
 679         spin_unlock_irqrestore(&ide_lock, flags);
 680         mutex_unlock(&ide_setting_mtx);
 681         return err >= 0 ? put_user(err, (long __user *)arg) : err;
 682
 683 set_val:
 684         if (bdev != bdev->bd_contains)
 685                 err = -EINVAL;
 686         else {
 687                 if (!capable(CAP_SYS_ADMIN))
 688                         err = -EACCES;
 689                 else {
 690                         mutex_lock(&ide_setting_mtx);
 691                         err = setfunc(drive, arg);
 692                         mutex_unlock(&ide_setting_mtx);
 693                 }
 694         }
 695         return err;
 696 }
 697
 698 EXPORT_SYMBOL(generic_ide_ioctl);
 699
 700 static int ide_bus_match(struct device *dev, struct device_driver *drv)
 701 {
 702         return 1;
 703 }
 704
 705 static char *media_string(ide_drive_t *drive)
 706 {
 707         switch (drive->media) {
 708         case ide_disk:
 709                 return "disk";
 710         case ide_cdrom:
 711                 return "cdrom";
 712         case ide_tape:
 713                 return "tape";
 714         case ide_floppy:
 715                 return "floppy";
 716         case ide_optical:
 717                 return "optical";
 718         default:
 719                 return "UNKNOWN";
 720         }
 721 }
 722
 723 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
 724 {
 725         ide_drive_t *drive = to_ide_device(dev);
 726         return sprintf(buf, "%s\n", media_string(drive));
 727 }
 728
 729 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
 730 {
 731         ide_drive_t *drive = to_ide_device(dev);
 732         return sprintf(buf, "%s\n", drive->name);
 733 }
 734
 735 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 736 {
 737         ide_drive_t *drive = to_ide_device(dev);
 738         return sprintf(buf, "ide:m-%s\n", media_string(drive));
 739 }
 740
 741 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
 742                           char *buf)
 743 {
 744         ide_drive_t *drive = to_ide_device(dev);
 745         return sprintf(buf, "%s\n", drive->id->model);
 746 }
 747
 748 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
 749                              char *buf)
 750 {
 751         ide_drive_t *drive = to_ide_device(dev);
 752         return sprintf(buf, "%s\n", drive->id->fw_rev);
 753 }
 754
 755 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
 756                            char *buf)
 757 {
 758         ide_drive_t *drive = to_ide_device(dev);
 759         return sprintf(buf, "%s\n", drive->id->serial_no);
 760 }
 761
 762 static struct device_attribute ide_dev_attrs[] = {
 763         __ATTR_RO(media),
 764         __ATTR_RO(drivename),
 765         __ATTR_RO(modalias),
 766         __ATTR_RO(model),
 767         __ATTR_RO(firmware),
 768         __ATTR(serial, 0400, serial_show, NULL),
 769         __ATTR_NULL
 770 };
 771
 772 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
 773 {
 774         ide_drive_t *drive = to_ide_device(dev);
 775
 776         add_uevent_var(env, "MEDIA=%s", media_string(drive));
 777         add_uevent_var(env, "DRIVENAME=%s", drive->name);
 778         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
 779         return 0;
 780 }
 781
 782 static int generic_ide_probe(struct device *dev)
 783 {
 784         ide_drive_t *drive = to_ide_device(dev);
 785         ide_driver_t *drv = to_ide_driver(dev->driver);
 786
 787         return drv->probe ? drv->probe(drive) : -ENODEV;
 788 }
 789
 790 static int generic_ide_remove(struct device *dev)
 791 {
 792         ide_drive_t *drive = to_ide_device(dev);
 793         ide_driver_t *drv = to_ide_driver(dev->driver);
 794
 795         if (drv->remove)
 796                 drv->remove(drive);
 797
 798         return 0;
 799 }
 800
 801 static void generic_ide_shutdown(struct device *dev)
 802 {
 803         ide_drive_t *drive = to_ide_device(dev);
 804         ide_driver_t *drv = to_ide_driver(dev->driver);
 805
 806         if (dev->driver && drv->shutdown)
 807                 drv->shutdown(drive);
 808 }
 809
 810 struct bus_type ide_bus_type = {
 811         .name           = "ide",
 812         .match          = ide_bus_match,
 813         .uevent         = ide_uevent,
 814         .probe          = generic_ide_probe,
 815         .remove         = generic_ide_remove,
 816         .shutdown       = generic_ide_shutdown,
 817         .dev_attrs      = ide_dev_attrs,
 818         .suspend        = generic_ide_suspend,
 819         .resume         = generic_ide_resume,
 820 };
 821
 822 EXPORT_SYMBOL_GPL(ide_bus_type);
 823
 824 int ide_vlb_clk;
 825 EXPORT_SYMBOL_GPL(ide_vlb_clk);
 826
 827 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
 828 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
 829
 830 int ide_pci_clk;
 831 EXPORT_SYMBOL_GPL(ide_pci_clk);
 832
 833 module_param_named(pci_clock, ide_pci_clk, int, 0);
 834 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
 835
 836 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
 837 {
 838         int a, b, i, j = 1;
 839         unsigned int *dev_param_mask = (unsigned int *)kp->arg;
 840
 841         if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
 842             sscanf(s, "%d.%d", &a, &b) != 2)
 843                 return -EINVAL;
 844
 845         i = a * MAX_DRIVES + b;
 846
 847         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 848                 return -EINVAL;
 849
 850         if (j)
 851                 *dev_param_mask |= (1 << i);
 852         else
 853                 *dev_param_mask &= (1 << i);
 854
 855         return 0;
 856 }
 857
 858 static unsigned int ide_nodma;
 859
 860 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
 861 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
 862
 863 static unsigned int ide_noflush;
 864
 865 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
 866 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
 867
 868 static unsigned int ide_noprobe;
 869
 870 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
 871 MODULE_PARM_DESC(noprobe, "skip probing for a device");
 872
 873 static unsigned int ide_nowerr;
 874
 875 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
 876 MODULE_PARM_DESC(nowerr, "ignore the WRERR_STAT bit for a device");
 877
 878 static unsigned int ide_cdroms;
 879
 880 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
 881 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
 882
 883 struct chs_geom {
 884         unsigned int    cyl;
 885         u8              head;
 886         u8              sect;
 887 };
 888
 889 static unsigned int ide_disks;
 890 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
 891
 892 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
 893 {
 894         int a, b, c = 0, h = 0, s = 0, i, j = 1;
 895
 896         if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
 897             sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
 898                 return -EINVAL;
 899
 900         i = a * MAX_DRIVES + b;
 901
 902         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 903                 return -EINVAL;
 904
 905         if (c > INT_MAX || h > 255 || s > 255)
 906                 return -EINVAL;
 907
 908         if (j)
 909                 ide_disks |= (1 << i);
 910         else
 911                 ide_disks &= (1 << i);
 912
 913         ide_disks_chs[i].cyl  = c;
 914         ide_disks_chs[i].head = h;
 915         ide_disks_chs[i].sect = s;
 916
 917         return 0;
 918 }
 919
 920 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
 921 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
 922
 923 static void ide_dev_apply_params(ide_drive_t *drive)
 924 {
 925         int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;
 926
 927         if (ide_nodma & (1 << i)) {
 928                 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
 929                 drive->nodma = 1;
 930         }
 931         if (ide_noflush & (1 << i)) {
 932                 printk(KERN_INFO "ide: disabling flush requests for %s\n",
 933                                  drive->name);
 934                 drive->noflush = 1;
 935         }
 936         if (ide_noprobe & (1 << i)) {
 937                 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
 938                 drive->noprobe = 1;
 939         }
 940         if (ide_nowerr & (1 << i)) {
 941                 printk(KERN_INFO "ide: ignoring the WRERR_STAT bit for %s\n",
 942                                  drive->name);
 943                 drive->bad_wstat = BAD_R_STAT;
 944         }
 945         if (ide_cdroms & (1 << i)) {
 946                 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
 947                 drive->present = 1;
 948                 drive->media = ide_cdrom;
 949                 /* an ATAPI device ignores DRDY */
 950                 drive->ready_stat = 0;
 951         }
 952         if (ide_disks & (1 << i)) {
 953                 drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
 954                 drive->head = drive->bios_head = ide_disks_chs[i].head;
 955                 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
 956                 drive->forced_geom = 1;
 957                 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
 958                                  drive->name,
 959                                  drive->cyl, drive->head, drive->sect);
 960                 drive->present = 1;
 961                 drive->media = ide_disk;
 962                 drive->ready_stat = READY_STAT;
 963         }
 964 }
 965
 966 static unsigned int ide_ignore_cable;
 967
 968 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
 969 {
 970         int i, j = 1;
 971
 972         if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
 973                 return -EINVAL;
 974
 975         if (i >= MAX_HWIFS || j < 0 || j > 1)
 976                 return -EINVAL;
 977
 978         if (j)
 979                 ide_ignore_cable |= (1 << i);
 980         else
 981                 ide_ignore_cable &= (1 << i);
 982
 983         return 0;
 984 }
 985
 986 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
 987 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
 988
 989 void ide_port_apply_params(ide_hwif_t *hwif)
 990 {
 991         int i;
 992
 993         if (ide_ignore_cable & (1 << hwif->index)) {
 994                 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
 995                                  hwif->name);
 996                 hwif->cbl = ATA_CBL_PATA40_SHORT;
 997         }
 998
 999         for (i = 0; i < MAX_DRIVES; i++)
1000                 ide_dev_apply_params(&hwif->drives[i]);
1001 }
1002
1003 /*
1004  * This is gets invoked once during initialization, to set *everything* up
1005  */
1006 static int __init ide_init(void)
1007 {
1008         int ret;
1009
1010         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
1011
1012         ret = bus_register(&ide_bus_type);
1013         if (ret < 0) {
1014                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1015                 return ret;
1016         }
1017
1018         ide_port_class = class_create(THIS_MODULE, "ide_port");
1019         if (IS_ERR(ide_port_class)) {
1020                 ret = PTR_ERR(ide_port_class);
1021                 goto out_port_class;
1022         }
1023
1024         init_ide_data();
1025
1026         proc_ide_create();
1027
1028         return 0;
1029
1030 out_port_class:
1031         bus_unregister(&ide_bus_type);
1032
1033         return ret;
1034 }
1035
1036 static void __exit ide_exit(void)
1037 {
1038         proc_ide_destroy();
1039
1040         class_destroy(ide_port_class);
1041
1042         bus_unregister(&ide_bus_type);
1043 }
1044
1045 module_init(ide_init);
1046 module_exit(ide_exit);
1047
1048 MODULE_LICENSE("GPL");