SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/ide/ide.c

   1 /*
   2  *  Copyright (C) 1994-1998         Linus Torvalds & authors (see below)
   3  *  Copyright (C) 2003-2005, 2007   Bartlomiej Zolnierkiewicz
   4  */
   5
   6 /*
   7  *  Mostly written by Mark Lord  <mlord@pobox.com>
   8  *                and Gadi Oxman <gadio@netvision.net.il>
   9  *                and Andre Hedrick <andre@linux-ide.org>
  10  *
  11  *  See linux/MAINTAINERS for address of current maintainer.
  12  *
  13  * This is the multiple IDE interface driver, as evolved from hd.c.
  14  * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
  15  *   (usually 14 & 15).
  16  * There can be up to two drives per interface, as per the ATA-2 spec.
  17  *
  18  * ...
  19  *
  20  *  From hd.c:
  21  *  |
  22  *  | It traverses the request-list, using interrupts to jump between functions.
  23  *  | As nearly all functions can be called within interrupts, we may not sleep.
  24  *  | Special care is recommended.  Have Fun!
  25  *  |
  26  *  | modified by Drew Eckhardt to check nr of hd's from the CMOS.
  27  *  |
  28  *  | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
  29  *  | in the early extended-partition checks and added DM partitions.
  30  *  |
  31  *  | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
  32  *  |
  33  *  | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
  34  *  | and general streamlining by Mark Lord (mlord@pobox.com).
  35  *
  36  *  October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
  37  *
  38  *      Mark Lord       (mlord@pobox.com)               (IDE Perf.Pkg)
  39  *      Delman Lee      (delman@ieee.org)               ("Mr. atdisk2")
  40  *      Scott Snyder    (snyder@fnald0.fnal.gov)        (ATAPI IDE cd-rom)
  41  *
  42  *  This was a rewrite of just about everything from hd.c, though some original
  43  *  code is still sprinkled about.  Think of it as a major evolution, with
  44  *  inspiration from lots of linux users, esp.  hamish@zot.apana.org.au
  45  */
  46
  47 #include <linux/module.h>
  48 #include <linux/types.h>
  49 #include <linux/string.h>
  50 #include <linux/kernel.h>
  51 #include <linux/interrupt.h>
  52 #include <linux/major.h>
  53 #include <linux/errno.h>
  54 #include <linux/genhd.h>
  55 #include <linux/slab.h>
  56 #include <linux/init.h>
  57 #include <linux/pci.h>
  58 #include <linux/ide.h>
  59 #include <linux/completion.h>
  60 #include <linux/device.h>
  61
  62
  63 /* default maximum number of failures */
  64 #define IDE_DEFAULT_MAX_FAILURES        1
  65
  66 struct class *ide_port_class;
  67
  68 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
  69                                         IDE2_MAJOR, IDE3_MAJOR,
  70                                         IDE4_MAJOR, IDE5_MAJOR,
  71                                         IDE6_MAJOR, IDE7_MAJOR,
  72                                         IDE8_MAJOR, IDE9_MAJOR };
  73
  74 DEFINE_MUTEX(ide_cfg_mtx);
  75
  76 __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
  77 EXPORT_SYMBOL(ide_lock);
  78
  79 static void ide_port_init_devices_data(ide_hwif_t *);
  80
  81 /*
  82  * Do not even *think* about calling this!
  83  */
  84 void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
  85 {
  86         /* bulk initialize hwif & drive info with zeros */
  87         memset(hwif, 0, sizeof(ide_hwif_t));
  88
  89         /* fill in any non-zero initial values */
  90         hwif->index     = index;
  91         hwif->major     = ide_hwif_to_major[index];
  92
  93         hwif->name[0]   = 'i';
  94         hwif->name[1]   = 'd';
  95         hwif->name[2]   = 'e';
  96         hwif->name[3]   = '0' + index;
  97
  98         hwif->bus_state = BUSSTATE_ON;
  99
 100         init_completion(&hwif->gendev_rel_comp);
 101
 102         hwif->tp_ops = &default_tp_ops;
 103
 104         ide_port_init_devices_data(hwif);
 105 }
 106
 107 static void ide_port_init_devices_data(ide_hwif_t *hwif)
 108 {
 109         int unit;
 110
 111         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 112                 ide_drive_t *drive = &hwif->drives[unit];
 113                 u8 j = (hwif->index * MAX_DRIVES) + unit;
 114
 115                 memset(drive, 0, sizeof(*drive));
 116
 117                 drive->media                    = ide_disk;
 118                 drive->select.all               = (unit<<4)|0xa0;
 119                 drive->hwif                     = hwif;
 120                 drive->ready_stat               = ATA_DRDY;
 121                 drive->bad_wstat                = BAD_W_STAT;
 122                 drive->special.b.recalibrate    = 1;
 123                 drive->special.b.set_geometry   = 1;
 124                 drive->name[0]                  = 'h';
 125                 drive->name[1]                  = 'd';
 126                 drive->name[2]                  = 'a' + j;
 127                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
 128
 129                 INIT_LIST_HEAD(&drive->list);
 130                 init_completion(&drive->gendev_rel_comp);
 131         }
 132 }
 133
 134 /* Called with ide_lock held. */
 135 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
 136 {
 137         int i;
 138
 139         for (i = 0; i < MAX_DRIVES; i++) {
 140                 ide_drive_t *drive = &hwif->drives[i];
 141
 142                 if (drive->present) {
 143                         spin_unlock_irq(&ide_lock);
 144                         device_unregister(&drive->gendev);
 145                         wait_for_completion(&drive->gendev_rel_comp);
 146                         spin_lock_irq(&ide_lock);
 147                 }
 148         }
 149 }
 150
 151 void ide_port_unregister_devices(ide_hwif_t *hwif)
 152 {
 153         mutex_lock(&ide_cfg_mtx);
 154         spin_lock_irq(&ide_lock);
 155         __ide_port_unregister_devices(hwif);
 156         hwif->present = 0;
 157         ide_port_init_devices_data(hwif);
 158         spin_unlock_irq(&ide_lock);
 159         mutex_unlock(&ide_cfg_mtx);
 160 }
 161 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
 162
 163 /**
 164  *      ide_unregister          -       free an IDE interface
 165  *      @hwif: IDE interface
 166  *
 167  *      Perform the final unregister of an IDE interface. At the moment
 168  *      we don't refcount interfaces so this will also get split up.
 169  *
 170  *      Locking:
 171  *      The caller must not hold the IDE locks
 172  *      The drive present/vanishing is not yet properly locked
 173  *      Take care with the callbacks. These have been split to avoid
 174  *      deadlocking the IDE layer. The shutdown callback is called
 175  *      before we take the lock and free resources. It is up to the
 176  *      caller to be sure there is no pending I/O here, and that
 177  *      the interface will not be reopened (present/vanishing locking
 178  *      isn't yet done BTW). After we commit to the final kill we
 179  *      call the cleanup callback with the ide locks held.
 180  *
 181  *      Unregister restores the hwif structures to the default state.
 182  *      This is raving bonkers.
 183  */
 184
 185 void ide_unregister(ide_hwif_t *hwif)
 186 {
 187         ide_hwif_t *g;
 188         ide_hwgroup_t *hwgroup;
 189         int irq_count = 0;
 190
 191         BUG_ON(in_interrupt());
 192         BUG_ON(irqs_disabled());
 193
 194         mutex_lock(&ide_cfg_mtx);
 195
 196         spin_lock_irq(&ide_lock);
 197         if (hwif->present) {
 198                 __ide_port_unregister_devices(hwif);
 199                 hwif->present = 0;
 200         }
 201         spin_unlock_irq(&ide_lock);
 202
 203         ide_proc_unregister_port(hwif);
 204
 205         hwgroup = hwif->hwgroup;
 206         /*
 207          * free the irq if we were the only hwif using it
 208          */
 209         g = hwgroup->hwif;
 210         do {
 211                 if (g->irq == hwif->irq)
 212                         ++irq_count;
 213                 g = g->next;
 214         } while (g != hwgroup->hwif);
 215         if (irq_count == 1)
 216                 free_irq(hwif->irq, hwgroup);
 217
 218         ide_remove_port_from_hwgroup(hwif);
 219
 220         device_unregister(hwif->portdev);
 221         device_unregister(&hwif->gendev);
 222         wait_for_completion(&hwif->gendev_rel_comp);
 223
 224         /*
 225          * Remove us from the kernel's knowledge
 226          */
 227         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 228         kfree(hwif->sg_table);
 229         unregister_blkdev(hwif->major, hwif->name);
 230
 231         if (hwif->dma_base)
 232                 ide_release_dma_engine(hwif);
 233
 234         mutex_unlock(&ide_cfg_mtx);
 235 }
 236
 237 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
 238 {
 239         memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
 240         hwif->irq = hw->irq;
 241         hwif->chipset = hw->chipset;
 242         hwif->dev = hw->dev;
 243         hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
 244         hwif->ack_intr = hw->ack_intr;
 245         hwif->config_data = hw->config;
 246 }
 247
 248 /*
 249  *      Locks for IDE setting functionality
 250  */
 251
 252 DEFINE_MUTEX(ide_setting_mtx);
 253
 254 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 255
 256 /**
 257  *      ide_spin_wait_hwgroup   -       wait for group
 258  *      @drive: drive in the group
 259  *
 260  *      Wait for an IDE device group to go non busy and then return
 261  *      holding the ide_lock which guards the hwgroup->busy status
 262  *      and right to use it.
 263  */
 264
 265 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 266 {
 267         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 268         unsigned long timeout = jiffies + (3 * HZ);
 269
 270         spin_lock_irq(&ide_lock);
 271
 272         while (hwgroup->busy) {
 273                 unsigned long lflags;
 274                 spin_unlock_irq(&ide_lock);
 275                 local_irq_set(lflags);
 276                 if (time_after(jiffies, timeout)) {
 277                         local_irq_restore(lflags);
 278                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 279                         return -EBUSY;
 280                 }
 281                 local_irq_restore(lflags);
 282                 spin_lock_irq(&ide_lock);
 283         }
 284         return 0;
 285 }
 286
 287 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 288
 289 int set_io_32bit(ide_drive_t *drive, int arg)
 290 {
 291         if (drive->no_io_32bit)
 292                 return -EPERM;
 293
 294         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 295                 return -EINVAL;
 296
 297         if (ide_spin_wait_hwgroup(drive))
 298                 return -EBUSY;
 299
 300         drive->io_32bit = arg;
 301
 302         spin_unlock_irq(&ide_lock);
 303
 304         return 0;
 305 }
 306
 307 static int set_ksettings(ide_drive_t *drive, int arg)
 308 {
 309         if (arg < 0 || arg > 1)
 310                 return -EINVAL;
 311
 312         if (ide_spin_wait_hwgroup(drive))
 313                 return -EBUSY;
 314         drive->keep_settings = arg;
 315         spin_unlock_irq(&ide_lock);
 316
 317         return 0;
 318 }
 319
 320 int set_using_dma(ide_drive_t *drive, int arg)
 321 {
 322 #ifdef CONFIG_BLK_DEV_IDEDMA
 323         ide_hwif_t *hwif = drive->hwif;
 324         int err = -EPERM;
 325
 326         if (arg < 0 || arg > 1)
 327                 return -EINVAL;
 328
 329         if (ata_id_has_dma(drive->id) == 0)
 330                 goto out;
 331
 332         if (hwif->dma_ops == NULL)
 333                 goto out;
 334
 335         err = -EBUSY;
 336         if (ide_spin_wait_hwgroup(drive))
 337                 goto out;
 338         /*
 339          * set ->busy flag, unlock and let it ride
 340          */
 341         hwif->hwgroup->busy = 1;
 342         spin_unlock_irq(&ide_lock);
 343
 344         err = 0;
 345
 346         if (arg) {
 347                 if (ide_set_dma(drive))
 348                         err = -EIO;
 349         } else
 350                 ide_dma_off(drive);
 351
 352         /*
 353          * lock, clear ->busy flag and unlock before leaving
 354          */
 355         spin_lock_irq(&ide_lock);
 356         hwif->hwgroup->busy = 0;
 357         spin_unlock_irq(&ide_lock);
 358 out:
 359         return err;
 360 #else
 361         if (arg < 0 || arg > 1)
 362                 return -EINVAL;
 363
 364         return -EPERM;
 365 #endif
 366 }
 367
 368 int set_pio_mode(ide_drive_t *drive, int arg)
 369 {
 370         struct request *rq;
 371         ide_hwif_t *hwif = drive->hwif;
 372         const struct ide_port_ops *port_ops = hwif->port_ops;
 373
 374         if (arg < 0 || arg > 255)
 375                 return -EINVAL;
 376
 377         if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
 378             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
 379                 return -ENOSYS;
 380
 381         if (drive->special.b.set_tune)
 382                 return -EBUSY;
 383
 384         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 385         rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
 386
 387         drive->tune_req = (u8) arg;
 388         drive->special.b.set_tune = 1;
 389
 390         blk_execute_rq(drive->queue, NULL, rq, 0);
 391         blk_put_request(rq);
 392
 393         return 0;
 394 }
 395
 396 static int set_unmaskirq(ide_drive_t *drive, int arg)
 397 {
 398         if (drive->no_unmask)
 399                 return -EPERM;
 400
 401         if (arg < 0 || arg > 1)
 402                 return -EINVAL;
 403
 404         if (ide_spin_wait_hwgroup(drive))
 405                 return -EBUSY;
 406         drive->unmask = arg;
 407         spin_unlock_irq(&ide_lock);
 408
 409         return 0;
 410 }
 411
 412 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 413 {
 414         ide_drive_t *drive = dev->driver_data;
 415         ide_hwif_t *hwif = HWIF(drive);
 416         struct request *rq;
 417         struct request_pm_state rqpm;
 418         ide_task_t args;
 419         int ret;
 420
 421         /* Call ACPI _GTM only once */
 422         if (!(drive->dn % 2))
 423                 ide_acpi_get_timing(hwif);
 424
 425         memset(&rqpm, 0, sizeof(rqpm));
 426         memset(&args, 0, sizeof(args));
 427         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 428         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
 429         rq->special = &args;
 430         rq->data = &rqpm;
 431         rqpm.pm_step = ide_pm_state_start_suspend;
 432         if (mesg.event == PM_EVENT_PRETHAW)
 433                 mesg.event = PM_EVENT_FREEZE;
 434         rqpm.pm_state = mesg.event;
 435
 436         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
 437         blk_put_request(rq);
 438         /* only call ACPI _PS3 after both drivers are suspended */
 439         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 440                  && hwif->drives[1].present)
 441                  || !hwif->drives[0].present
 442                  || !hwif->drives[1].present))
 443                 ide_acpi_set_state(hwif, 0);
 444         return ret;
 445 }
 446
 447 static int generic_ide_resume(struct device *dev)
 448 {
 449         ide_drive_t *drive = dev->driver_data;
 450         ide_hwif_t *hwif = HWIF(drive);
 451         struct request *rq;
 452         struct request_pm_state rqpm;
 453         ide_task_t args;
 454         int err;
 455
 456         /* Call ACPI _STM only once */
 457         if (!(drive->dn % 2)) {
 458                 ide_acpi_set_state(hwif, 1);
 459                 ide_acpi_push_timing(hwif);
 460         }
 461
 462         ide_acpi_exec_tfs(drive);
 463
 464         memset(&rqpm, 0, sizeof(rqpm));
 465         memset(&args, 0, sizeof(args));
 466         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 467         rq->cmd_type = REQ_TYPE_PM_RESUME;
 468         rq->cmd_flags |= REQ_PREEMPT;
 469         rq->special = &args;
 470         rq->data = &rqpm;
 471         rqpm.pm_step = ide_pm_state_start_resume;
 472         rqpm.pm_state = PM_EVENT_ON;
 473
 474         err = blk_execute_rq(drive->queue, NULL, rq, 1);
 475         blk_put_request(rq);
 476
 477         if (err == 0 && dev->driver) {
 478                 ide_driver_t *drv = to_ide_driver(dev->driver);
 479
 480                 if (drv->resume)
 481                         drv->resume(drive);
 482         }
 483
 484         return err;
 485 }
 486
 487 static int generic_drive_reset(ide_drive_t *drive)
 488 {
 489         struct request *rq;
 490         int ret = 0;
 491
 492         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 493         rq->cmd_type = REQ_TYPE_SPECIAL;
 494         rq->cmd_len = 1;
 495         rq->cmd[0] = REQ_DRIVE_RESET;
 496         rq->cmd_flags |= REQ_SOFTBARRIER;
 497         if (blk_execute_rq(drive->queue, NULL, rq, 1))
 498                 ret = rq->errors;
 499         blk_put_request(rq);
 500         return ret;
 501 }
 502
 503 static inline void ide_id_to_hd_driveid(u16 *id)
 504 {
 505 #ifdef __BIG_ENDIAN
 506         /* accessed in struct hd_driveid as 8-bit values */
 507         id[ATA_ID_MAX_MULTSECT]  = __cpu_to_le16(id[ATA_ID_MAX_MULTSECT]);
 508         id[ATA_ID_CAPABILITY]    = __cpu_to_le16(id[ATA_ID_CAPABILITY]);
 509         id[ATA_ID_OLD_PIO_MODES] = __cpu_to_le16(id[ATA_ID_OLD_PIO_MODES]);
 510         id[ATA_ID_OLD_DMA_MODES] = __cpu_to_le16(id[ATA_ID_OLD_DMA_MODES]);
 511         id[ATA_ID_MULTSECT]      = __cpu_to_le16(id[ATA_ID_MULTSECT]);
 512
 513         /* as 32-bit values */
 514         *(u32 *)&id[ATA_ID_LBA_CAPACITY] = ata_id_u32(id, ATA_ID_LBA_CAPACITY);
 515         *(u32 *)&id[ATA_ID_SPG]          = ata_id_u32(id, ATA_ID_SPG);
 516
 517         /* as 64-bit value */
 518         *(u64 *)&id[ATA_ID_LBA_CAPACITY_2] =
 519                 ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
 520 #endif
 521 }
 522
 523 static int ide_get_identity_ioctl(ide_drive_t *drive, unsigned int cmd,
 524                                   unsigned long arg)
 525 {
 526         u16 *id = NULL;
 527         int size = (cmd == HDIO_GET_IDENTITY) ? (ATA_ID_WORDS * 2) : 142;
 528         int rc = 0;
 529
 530         if (drive->id_read == 0) {
 531                 rc = -ENOMSG;
 532                 goto out;
 533         }
 534
 535         id = kmalloc(size, GFP_KERNEL);
 536         if (id == NULL) {
 537                 rc = -ENOMEM;
 538                 goto out;
 539         }
 540
 541         memcpy(id, drive->id, size);
 542         ide_id_to_hd_driveid(id);
 543
 544         if (copy_to_user((void __user *)arg, id, size))
 545                 rc = -EFAULT;
 546
 547         kfree(id);
 548 out:
 549         return rc;
 550 }
 551
 552 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 553                         unsigned int cmd, unsigned long arg)
 554 {
 555         unsigned long flags;
 556         ide_driver_t *drv;
 557         int err = 0, (*setfunc)(ide_drive_t *, int);
 558         u8 *val;
 559
 560         switch (cmd) {
 561         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
 562         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
 563         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
 564         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
 565         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
 566         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
 567         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
 568         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
 569         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
 570         }
 571
 572         switch (cmd) {
 573                 case HDIO_OBSOLETE_IDENTITY:
 574                 case HDIO_GET_IDENTITY:
 575                         if (bdev != bdev->bd_contains)
 576                                 return -EINVAL;
 577                         return ide_get_identity_ioctl(drive, cmd, arg);
 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                         return generic_drive_reset(drive);
 621
 622                 case HDIO_GET_BUSSTATE:
 623                         if (!capable(CAP_SYS_ADMIN))
 624                                 return -EACCES;
 625                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
 626                                 return -EFAULT;
 627                         return 0;
 628
 629                 case HDIO_SET_BUSSTATE:
 630                         if (!capable(CAP_SYS_ADMIN))
 631                                 return -EACCES;
 632                         return -EOPNOTSUPP;
 633                 default:
 634                         return -EINVAL;
 635         }
 636
 637 read_val:
 638         mutex_lock(&ide_setting_mtx);
 639         spin_lock_irqsave(&ide_lock, flags);
 640         err = *val;
 641         spin_unlock_irqrestore(&ide_lock, flags);
 642         mutex_unlock(&ide_setting_mtx);
 643         return err >= 0 ? put_user(err, (long __user *)arg) : err;
 644
 645 set_val:
 646         if (bdev != bdev->bd_contains)
 647                 err = -EINVAL;
 648         else {
 649                 if (!capable(CAP_SYS_ADMIN))
 650                         err = -EACCES;
 651                 else {
 652                         mutex_lock(&ide_setting_mtx);
 653                         err = setfunc(drive, arg);
 654                         mutex_unlock(&ide_setting_mtx);
 655                 }
 656         }
 657         return err;
 658 }
 659
 660 EXPORT_SYMBOL(generic_ide_ioctl);
 661
 662 /**
 663  * ide_device_get       -       get an additional reference to a ide_drive_t
 664  * @drive:      device to get a reference to
 665  *
 666  * Gets a reference to the ide_drive_t and increments the use count of the
 667  * underlying LLDD module.
 668  */
 669 int ide_device_get(ide_drive_t *drive)
 670 {
 671         struct device *host_dev;
 672         struct module *module;
 673
 674         if (!get_device(&drive->gendev))
 675                 return -ENXIO;
 676
 677         host_dev = drive->hwif->host->dev[0];
 678         module = host_dev ? host_dev->driver->owner : NULL;
 679
 680         if (module && !try_module_get(module)) {
 681                 put_device(&drive->gendev);
 682                 return -ENXIO;
 683         }
 684
 685         return 0;
 686 }
 687 EXPORT_SYMBOL_GPL(ide_device_get);
 688
 689 /**
 690  * ide_device_put       -       release a reference to a ide_drive_t
 691  * @drive:      device to release a reference on
 692  *
 693  * Release a reference to the ide_drive_t and decrements the use count of
 694  * the underlying LLDD module.
 695  */
 696 void ide_device_put(ide_drive_t *drive)
 697 {
 698 #ifdef CONFIG_MODULE_UNLOAD
 699         struct device *host_dev = drive->hwif->host->dev[0];
 700         struct module *module = host_dev ? host_dev->driver->owner : NULL;
 701
 702         if (module)
 703                 module_put(module);
 704 #endif
 705         put_device(&drive->gendev);
 706 }
 707 EXPORT_SYMBOL_GPL(ide_device_put);
 708
 709 static int ide_bus_match(struct device *dev, struct device_driver *drv)
 710 {
 711         return 1;
 712 }
 713
 714 static char *media_string(ide_drive_t *drive)
 715 {
 716         switch (drive->media) {
 717         case ide_disk:
 718                 return "disk";
 719         case ide_cdrom:
 720                 return "cdrom";
 721         case ide_tape:
 722                 return "tape";
 723         case ide_floppy:
 724                 return "floppy";
 725         case ide_optical:
 726                 return "optical";
 727         default:
 728                 return "UNKNOWN";
 729         }
 730 }
 731
 732 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
 733 {
 734         ide_drive_t *drive = to_ide_device(dev);
 735         return sprintf(buf, "%s\n", media_string(drive));
 736 }
 737
 738 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
 739 {
 740         ide_drive_t *drive = to_ide_device(dev);
 741         return sprintf(buf, "%s\n", drive->name);
 742 }
 743
 744 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 745 {
 746         ide_drive_t *drive = to_ide_device(dev);
 747         return sprintf(buf, "ide:m-%s\n", media_string(drive));
 748 }
 749
 750 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
 751                           char *buf)
 752 {
 753         ide_drive_t *drive = to_ide_device(dev);
 754         return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_PROD]);
 755 }
 756
 757 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
 758                              char *buf)
 759 {
 760         ide_drive_t *drive = to_ide_device(dev);
 761         return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_FW_REV]);
 762 }
 763
 764 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
 765                            char *buf)
 766 {
 767         ide_drive_t *drive = to_ide_device(dev);
 768         return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_SERNO]);
 769 }
 770
 771 static struct device_attribute ide_dev_attrs[] = {
 772         __ATTR_RO(media),
 773         __ATTR_RO(drivename),
 774         __ATTR_RO(modalias),
 775         __ATTR_RO(model),
 776         __ATTR_RO(firmware),
 777         __ATTR(serial, 0400, serial_show, NULL),
 778         __ATTR_NULL
 779 };
 780
 781 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
 782 {
 783         ide_drive_t *drive = to_ide_device(dev);
 784
 785         add_uevent_var(env, "MEDIA=%s", media_string(drive));
 786         add_uevent_var(env, "DRIVENAME=%s", drive->name);
 787         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
 788         return 0;
 789 }
 790
 791 static int generic_ide_probe(struct device *dev)
 792 {
 793         ide_drive_t *drive = to_ide_device(dev);
 794         ide_driver_t *drv = to_ide_driver(dev->driver);
 795
 796         return drv->probe ? drv->probe(drive) : -ENODEV;
 797 }
 798
 799 static int generic_ide_remove(struct device *dev)
 800 {
 801         ide_drive_t *drive = to_ide_device(dev);
 802         ide_driver_t *drv = to_ide_driver(dev->driver);
 803
 804         if (drv->remove)
 805                 drv->remove(drive);
 806
 807         return 0;
 808 }
 809
 810 static void generic_ide_shutdown(struct device *dev)
 811 {
 812         ide_drive_t *drive = to_ide_device(dev);
 813         ide_driver_t *drv = to_ide_driver(dev->driver);
 814
 815         if (dev->driver && drv->shutdown)
 816                 drv->shutdown(drive);
 817 }
 818
 819 struct bus_type ide_bus_type = {
 820         .name           = "ide",
 821         .match          = ide_bus_match,
 822         .uevent         = ide_uevent,
 823         .probe          = generic_ide_probe,
 824         .remove         = generic_ide_remove,
 825         .shutdown       = generic_ide_shutdown,
 826         .dev_attrs      = ide_dev_attrs,
 827         .suspend        = generic_ide_suspend,
 828         .resume         = generic_ide_resume,
 829 };
 830
 831 EXPORT_SYMBOL_GPL(ide_bus_type);
 832
 833 int ide_vlb_clk;
 834 EXPORT_SYMBOL_GPL(ide_vlb_clk);
 835
 836 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
 837 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
 838
 839 int ide_pci_clk;
 840 EXPORT_SYMBOL_GPL(ide_pci_clk);
 841
 842 module_param_named(pci_clock, ide_pci_clk, int, 0);
 843 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
 844
 845 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
 846 {
 847         int a, b, i, j = 1;
 848         unsigned int *dev_param_mask = (unsigned int *)kp->arg;
 849
 850         if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
 851             sscanf(s, "%d.%d", &a, &b) != 2)
 852                 return -EINVAL;
 853
 854         i = a * MAX_DRIVES + b;
 855
 856         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 857                 return -EINVAL;
 858
 859         if (j)
 860                 *dev_param_mask |= (1 << i);
 861         else
 862                 *dev_param_mask &= (1 << i);
 863
 864         return 0;
 865 }
 866
 867 static unsigned int ide_nodma;
 868
 869 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
 870 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
 871
 872 static unsigned int ide_noflush;
 873
 874 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
 875 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
 876
 877 static unsigned int ide_noprobe;
 878
 879 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
 880 MODULE_PARM_DESC(noprobe, "skip probing for a device");
 881
 882 static unsigned int ide_nowerr;
 883
 884 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
 885 MODULE_PARM_DESC(nowerr, "ignore the ATA_DF bit for a device");
 886
 887 static unsigned int ide_cdroms;
 888
 889 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
 890 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
 891
 892 struct chs_geom {
 893         unsigned int    cyl;
 894         u8              head;
 895         u8              sect;
 896 };
 897
 898 static unsigned int ide_disks;
 899 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
 900
 901 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
 902 {
 903         int a, b, c = 0, h = 0, s = 0, i, j = 1;
 904
 905         if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
 906             sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
 907                 return -EINVAL;
 908
 909         i = a * MAX_DRIVES + b;
 910
 911         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 912                 return -EINVAL;
 913
 914         if (c > INT_MAX || h > 255 || s > 255)
 915                 return -EINVAL;
 916
 917         if (j)
 918                 ide_disks |= (1 << i);
 919         else
 920                 ide_disks &= (1 << i);
 921
 922         ide_disks_chs[i].cyl  = c;
 923         ide_disks_chs[i].head = h;
 924         ide_disks_chs[i].sect = s;
 925
 926         return 0;
 927 }
 928
 929 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
 930 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
 931
 932 static void ide_dev_apply_params(ide_drive_t *drive)
 933 {
 934         int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;
 935
 936         if (ide_nodma & (1 << i)) {
 937                 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
 938                 drive->nodma = 1;
 939         }
 940         if (ide_noflush & (1 << i)) {
 941                 printk(KERN_INFO "ide: disabling flush requests for %s\n",
 942                                  drive->name);
 943                 drive->noflush = 1;
 944         }
 945         if (ide_noprobe & (1 << i)) {
 946                 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
 947                 drive->noprobe = 1;
 948         }
 949         if (ide_nowerr & (1 << i)) {
 950                 printk(KERN_INFO "ide: ignoring the ATA_DF bit for %s\n",
 951                                  drive->name);
 952                 drive->bad_wstat = BAD_R_STAT;
 953         }
 954         if (ide_cdroms & (1 << i)) {
 955                 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
 956                 drive->present = 1;
 957                 drive->media = ide_cdrom;
 958                 /* an ATAPI device ignores DRDY */
 959                 drive->ready_stat = 0;
 960         }
 961         if (ide_disks & (1 << i)) {
 962                 drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
 963                 drive->head = drive->bios_head = ide_disks_chs[i].head;
 964                 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
 965                 drive->forced_geom = 1;
 966                 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
 967                                  drive->name,
 968                                  drive->cyl, drive->head, drive->sect);
 969                 drive->present = 1;
 970                 drive->media = ide_disk;
 971                 drive->ready_stat = ATA_DRDY;
 972         }
 973 }
 974
 975 static unsigned int ide_ignore_cable;
 976
 977 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
 978 {
 979         int i, j = 1;
 980
 981         if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
 982                 return -EINVAL;
 983
 984         if (i >= MAX_HWIFS || j < 0 || j > 1)
 985                 return -EINVAL;
 986
 987         if (j)
 988                 ide_ignore_cable |= (1 << i);
 989         else
 990                 ide_ignore_cable &= (1 << i);
 991
 992         return 0;
 993 }
 994
 995 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
 996 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
 997
 998 void ide_port_apply_params(ide_hwif_t *hwif)
 999 {
1000         int i;
1001
1002         if (ide_ignore_cable & (1 << hwif->index)) {
1003                 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
1004                                  hwif->name);
1005                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1006         }
1007
1008         for (i = 0; i < MAX_DRIVES; i++)
1009                 ide_dev_apply_params(&hwif->drives[i]);
1010 }
1011
1012 /*
1013  * This is gets invoked once during initialization, to set *everything* up
1014  */
1015 static int __init ide_init(void)
1016 {
1017         int ret;
1018
1019         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
1020
1021         ret = bus_register(&ide_bus_type);
1022         if (ret < 0) {
1023                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1024                 return ret;
1025         }
1026
1027         ide_port_class = class_create(THIS_MODULE, "ide_port");
1028         if (IS_ERR(ide_port_class)) {
1029                 ret = PTR_ERR(ide_port_class);
1030                 goto out_port_class;
1031         }
1032
1033         proc_ide_create();
1034
1035         return 0;
1036
1037 out_port_class:
1038         bus_unregister(&ide_bus_type);
1039
1040         return ret;
1041 }
1042
1043 static void __exit ide_exit(void)
1044 {
1045         proc_ide_destroy();
1046
1047         class_destroy(ide_port_class);
1048
1049         bus_unregister(&ide_bus_type);
1050 }
1051
1052 module_init(ide_init);
1053 module_exit(ide_exit);
1054
1055 MODULE_LICENSE("GPL");