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   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/hdreg.h>
  60 #include <linux/completion.h>
  61 #include <linux/device.h>
  62
  63
  64 /* default maximum number of failures */
  65 #define IDE_DEFAULT_MAX_FAILURES        1
  66
  67 struct class *ide_port_class;
  68
  69 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
  70                                         IDE2_MAJOR, IDE3_MAJOR,
  71                                         IDE4_MAJOR, IDE5_MAJOR,
  72                                         IDE6_MAJOR, IDE7_MAJOR,
  73                                         IDE8_MAJOR, IDE9_MAJOR };
  74
  75 DEFINE_MUTEX(ide_cfg_mtx);
  76
  77 __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
  78 EXPORT_SYMBOL(ide_lock);
  79
  80 static void ide_port_init_devices_data(ide_hwif_t *);
  81
  82 /*
  83  * Do not even *think* about calling this!
  84  */
  85 void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
  86 {
  87         /* bulk initialize hwif & drive info with zeros */
  88         memset(hwif, 0, sizeof(ide_hwif_t));
  89
  90         /* fill in any non-zero initial values */
  91         hwif->index     = index;
  92         hwif->major     = ide_hwif_to_major[index];
  93
  94         hwif->name[0]   = 'i';
  95         hwif->name[1]   = 'd';
  96         hwif->name[2]   = 'e';
  97         hwif->name[3]   = '0' + index;
  98
  99         hwif->bus_state = BUSSTATE_ON;
 100
 101         init_completion(&hwif->gendev_rel_comp);
 102
 103         hwif->tp_ops = &default_tp_ops;
 104
 105         ide_port_init_devices_data(hwif);
 106 }
 107
 108 static void ide_port_init_devices_data(ide_hwif_t *hwif)
 109 {
 110         int unit;
 111
 112         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 113                 ide_drive_t *drive = &hwif->drives[unit];
 114                 u8 j = (hwif->index * MAX_DRIVES) + unit;
 115
 116                 memset(drive, 0, sizeof(*drive));
 117
 118                 drive->media                    = ide_disk;
 119                 drive->select.all               = (unit<<4)|0xa0;
 120                 drive->hwif                     = hwif;
 121                 drive->ready_stat               = ATA_DRDY;
 122                 drive->bad_wstat                = BAD_W_STAT;
 123                 drive->special.b.recalibrate    = 1;
 124                 drive->special.b.set_geometry   = 1;
 125                 drive->name[0]                  = 'h';
 126                 drive->name[1]                  = 'd';
 127                 drive->name[2]                  = 'a' + j;
 128                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
 129
 130                 INIT_LIST_HEAD(&drive->list);
 131                 init_completion(&drive->gendev_rel_comp);
 132         }
 133 }
 134
 135 /* Called with ide_lock held. */
 136 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
 137 {
 138         int i;
 139
 140         for (i = 0; i < MAX_DRIVES; i++) {
 141                 ide_drive_t *drive = &hwif->drives[i];
 142
 143                 if (drive->present) {
 144                         spin_unlock_irq(&ide_lock);
 145                         device_unregister(&drive->gendev);
 146                         wait_for_completion(&drive->gendev_rel_comp);
 147                         spin_lock_irq(&ide_lock);
 148                 }
 149         }
 150 }
 151
 152 void ide_port_unregister_devices(ide_hwif_t *hwif)
 153 {
 154         mutex_lock(&ide_cfg_mtx);
 155         spin_lock_irq(&ide_lock);
 156         __ide_port_unregister_devices(hwif);
 157         hwif->present = 0;
 158         ide_port_init_devices_data(hwif);
 159         spin_unlock_irq(&ide_lock);
 160         mutex_unlock(&ide_cfg_mtx);
 161 }
 162 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
 163
 164 /**
 165  *      ide_unregister          -       free an IDE interface
 166  *      @hwif: IDE interface
 167  *
 168  *      Perform the final unregister of an IDE interface. At the moment
 169  *      we don't refcount interfaces so this will also get split up.
 170  *
 171  *      Locking:
 172  *      The caller must not hold the IDE locks
 173  *      The drive present/vanishing is not yet properly locked
 174  *      Take care with the callbacks. These have been split to avoid
 175  *      deadlocking the IDE layer. The shutdown callback is called
 176  *      before we take the lock and free resources. It is up to the
 177  *      caller to be sure there is no pending I/O here, and that
 178  *      the interface will not be reopened (present/vanishing locking
 179  *      isn't yet done BTW). After we commit to the final kill we
 180  *      call the cleanup callback with the ide locks held.
 181  *
 182  *      Unregister restores the hwif structures to the default state.
 183  *      This is raving bonkers.
 184  */
 185
 186 void ide_unregister(ide_hwif_t *hwif)
 187 {
 188         ide_hwif_t *g;
 189         ide_hwgroup_t *hwgroup;
 190         int irq_count = 0;
 191
 192         BUG_ON(in_interrupt());
 193         BUG_ON(irqs_disabled());
 194
 195         mutex_lock(&ide_cfg_mtx);
 196
 197         spin_lock_irq(&ide_lock);
 198         if (hwif->present) {
 199                 __ide_port_unregister_devices(hwif);
 200                 hwif->present = 0;
 201         }
 202         spin_unlock_irq(&ide_lock);
 203
 204         ide_proc_unregister_port(hwif);
 205
 206         hwgroup = hwif->hwgroup;
 207         /*
 208          * free the irq if we were the only hwif using it
 209          */
 210         g = hwgroup->hwif;
 211         do {
 212                 if (g->irq == hwif->irq)
 213                         ++irq_count;
 214                 g = g->next;
 215         } while (g != hwgroup->hwif);
 216         if (irq_count == 1)
 217                 free_irq(hwif->irq, hwgroup);
 218
 219         ide_remove_port_from_hwgroup(hwif);
 220
 221         device_unregister(hwif->portdev);
 222         device_unregister(&hwif->gendev);
 223         wait_for_completion(&hwif->gendev_rel_comp);
 224
 225         /*
 226          * Remove us from the kernel's knowledge
 227          */
 228         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 229         kfree(hwif->sg_table);
 230         unregister_blkdev(hwif->major, hwif->name);
 231
 232         if (hwif->dma_base)
 233                 ide_release_dma_engine(hwif);
 234
 235         mutex_unlock(&ide_cfg_mtx);
 236 }
 237
 238 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
 239 {
 240         memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
 241         hwif->irq = hw->irq;
 242         hwif->chipset = hw->chipset;
 243         hwif->dev = hw->dev;
 244         hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
 245         hwif->ack_intr = hw->ack_intr;
 246         hwif->config_data = hw->config;
 247 }
 248
 249 /*
 250  *      Locks for IDE setting functionality
 251  */
 252
 253 DEFINE_MUTEX(ide_setting_mtx);
 254
 255 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 256
 257 /**
 258  *      ide_spin_wait_hwgroup   -       wait for group
 259  *      @drive: drive in the group
 260  *
 261  *      Wait for an IDE device group to go non busy and then return
 262  *      holding the ide_lock which guards the hwgroup->busy status
 263  *      and right to use it.
 264  */
 265
 266 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 267 {
 268         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 269         unsigned long timeout = jiffies + (3 * HZ);
 270
 271         spin_lock_irq(&ide_lock);
 272
 273         while (hwgroup->busy) {
 274                 unsigned long lflags;
 275                 spin_unlock_irq(&ide_lock);
 276                 local_irq_set(lflags);
 277                 if (time_after(jiffies, timeout)) {
 278                         local_irq_restore(lflags);
 279                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 280                         return -EBUSY;
 281                 }
 282                 local_irq_restore(lflags);
 283                 spin_lock_irq(&ide_lock);
 284         }
 285         return 0;
 286 }
 287
 288 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 289
 290 ide_devset_get(io_32bit, io_32bit);
 291
 292 int set_io_32bit(ide_drive_t *drive, int arg)
 293 {
 294         if (drive->no_io_32bit)
 295                 return -EPERM;
 296
 297         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 298                 return -EINVAL;
 299
 300         if (ide_spin_wait_hwgroup(drive))
 301                 return -EBUSY;
 302
 303         drive->io_32bit = arg;
 304
 305         spin_unlock_irq(&ide_lock);
 306
 307         return 0;
 308 }
 309
 310 ide_devset_get(ksettings, keep_settings);
 311
 312 int set_ksettings(ide_drive_t *drive, int arg)
 313 {
 314         if (arg < 0 || arg > 1)
 315                 return -EINVAL;
 316
 317         if (ide_spin_wait_hwgroup(drive))
 318                 return -EBUSY;
 319         drive->keep_settings = arg;
 320         spin_unlock_irq(&ide_lock);
 321
 322         return 0;
 323 }
 324
 325 ide_devset_get(using_dma, using_dma);
 326
 327 int set_using_dma(ide_drive_t *drive, int arg)
 328 {
 329 #ifdef CONFIG_BLK_DEV_IDEDMA
 330         ide_hwif_t *hwif = drive->hwif;
 331         int err = -EPERM;
 332
 333         if (arg < 0 || arg > 1)
 334                 return -EINVAL;
 335
 336         if (ata_id_has_dma(drive->id) == 0)
 337                 goto out;
 338
 339         if (hwif->dma_ops == NULL)
 340                 goto out;
 341
 342         err = -EBUSY;
 343         if (ide_spin_wait_hwgroup(drive))
 344                 goto out;
 345         /*
 346          * set ->busy flag, unlock and let it ride
 347          */
 348         hwif->hwgroup->busy = 1;
 349         spin_unlock_irq(&ide_lock);
 350
 351         err = 0;
 352
 353         if (arg) {
 354                 if (ide_set_dma(drive))
 355                         err = -EIO;
 356         } else
 357                 ide_dma_off(drive);
 358
 359         /*
 360          * lock, clear ->busy flag and unlock before leaving
 361          */
 362         spin_lock_irq(&ide_lock);
 363         hwif->hwgroup->busy = 0;
 364         spin_unlock_irq(&ide_lock);
 365 out:
 366         return err;
 367 #else
 368         if (arg < 0 || arg > 1)
 369                 return -EINVAL;
 370
 371         return -EPERM;
 372 #endif
 373 }
 374
 375 int set_pio_mode(ide_drive_t *drive, int arg)
 376 {
 377         struct request *rq;
 378         ide_hwif_t *hwif = drive->hwif;
 379         const struct ide_port_ops *port_ops = hwif->port_ops;
 380
 381         if (arg < 0 || arg > 255)
 382                 return -EINVAL;
 383
 384         if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
 385             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
 386                 return -ENOSYS;
 387
 388         if (drive->special.b.set_tune)
 389                 return -EBUSY;
 390
 391         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 392         rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
 393
 394         drive->tune_req = (u8) arg;
 395         drive->special.b.set_tune = 1;
 396
 397         blk_execute_rq(drive->queue, NULL, rq, 0);
 398         blk_put_request(rq);
 399
 400         return 0;
 401 }
 402
 403 ide_devset_get(unmaskirq, unmask);
 404
 405 int set_unmaskirq(ide_drive_t *drive, int arg)
 406 {
 407         if (drive->no_unmask)
 408                 return -EPERM;
 409
 410         if (arg < 0 || arg > 1)
 411                 return -EINVAL;
 412
 413         if (ide_spin_wait_hwgroup(drive))
 414                 return -EBUSY;
 415         drive->unmask = arg;
 416         spin_unlock_irq(&ide_lock);
 417
 418         return 0;
 419 }
 420
 421 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 422 {
 423         ide_drive_t *drive = dev->driver_data;
 424         ide_hwif_t *hwif = HWIF(drive);
 425         struct request *rq;
 426         struct request_pm_state rqpm;
 427         ide_task_t args;
 428         int ret;
 429
 430         /* Call ACPI _GTM only once */
 431         if (!(drive->dn % 2))
 432                 ide_acpi_get_timing(hwif);
 433
 434         memset(&rqpm, 0, sizeof(rqpm));
 435         memset(&args, 0, sizeof(args));
 436         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 437         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
 438         rq->special = &args;
 439         rq->data = &rqpm;
 440         rqpm.pm_step = ide_pm_state_start_suspend;
 441         if (mesg.event == PM_EVENT_PRETHAW)
 442                 mesg.event = PM_EVENT_FREEZE;
 443         rqpm.pm_state = mesg.event;
 444
 445         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
 446         blk_put_request(rq);
 447         /* only call ACPI _PS3 after both drivers are suspended */
 448         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 449                  && hwif->drives[1].present)
 450                  || !hwif->drives[0].present
 451                  || !hwif->drives[1].present))
 452                 ide_acpi_set_state(hwif, 0);
 453         return ret;
 454 }
 455
 456 static int generic_ide_resume(struct device *dev)
 457 {
 458         ide_drive_t *drive = dev->driver_data;
 459         ide_hwif_t *hwif = HWIF(drive);
 460         struct request *rq;
 461         struct request_pm_state rqpm;
 462         ide_task_t args;
 463         int err;
 464
 465         /* Call ACPI _STM only once */
 466         if (!(drive->dn % 2)) {
 467                 ide_acpi_set_state(hwif, 1);
 468                 ide_acpi_push_timing(hwif);
 469         }
 470
 471         ide_acpi_exec_tfs(drive);
 472
 473         memset(&rqpm, 0, sizeof(rqpm));
 474         memset(&args, 0, sizeof(args));
 475         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 476         rq->cmd_type = REQ_TYPE_PM_RESUME;
 477         rq->cmd_flags |= REQ_PREEMPT;
 478         rq->special = &args;
 479         rq->data = &rqpm;
 480         rqpm.pm_step = ide_pm_state_start_resume;
 481         rqpm.pm_state = PM_EVENT_ON;
 482
 483         err = blk_execute_rq(drive->queue, NULL, rq, 1);
 484         blk_put_request(rq);
 485
 486         if (err == 0 && dev->driver) {
 487                 ide_driver_t *drv = to_ide_driver(dev->driver);
 488
 489                 if (drv->resume)
 490                         drv->resume(drive);
 491         }
 492
 493         return err;
 494 }
 495
 496 static int generic_drive_reset(ide_drive_t *drive)
 497 {
 498         struct request *rq;
 499         int ret = 0;
 500
 501         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 502         rq->cmd_type = REQ_TYPE_SPECIAL;
 503         rq->cmd_len = 1;
 504         rq->cmd[0] = REQ_DRIVE_RESET;
 505         rq->cmd_flags |= REQ_SOFTBARRIER;
 506         if (blk_execute_rq(drive->queue, NULL, rq, 1))
 507                 ret = rq->errors;
 508         blk_put_request(rq);
 509         return ret;
 510 }
 511
 512 static inline void ide_id_to_hd_driveid(u16 *id)
 513 {
 514 #ifdef __BIG_ENDIAN
 515         /* accessed in struct hd_driveid as 8-bit values */
 516         id[ATA_ID_MAX_MULTSECT]  = __cpu_to_le16(id[ATA_ID_MAX_MULTSECT]);
 517         id[ATA_ID_CAPABILITY]    = __cpu_to_le16(id[ATA_ID_CAPABILITY]);
 518         id[ATA_ID_OLD_PIO_MODES] = __cpu_to_le16(id[ATA_ID_OLD_PIO_MODES]);
 519         id[ATA_ID_OLD_DMA_MODES] = __cpu_to_le16(id[ATA_ID_OLD_DMA_MODES]);
 520         id[ATA_ID_MULTSECT]      = __cpu_to_le16(id[ATA_ID_MULTSECT]);
 521
 522         /* as 32-bit values */
 523         *(u32 *)&id[ATA_ID_LBA_CAPACITY] = ata_id_u32(id, ATA_ID_LBA_CAPACITY);
 524         *(u32 *)&id[ATA_ID_SPG]          = ata_id_u32(id, ATA_ID_SPG);
 525
 526         /* as 64-bit value */
 527         *(u64 *)&id[ATA_ID_LBA_CAPACITY_2] =
 528                 ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
 529 #endif
 530 }
 531
 532 static int ide_get_identity_ioctl(ide_drive_t *drive, unsigned int cmd,
 533                                   unsigned long arg)
 534 {
 535         u16 *id = NULL;
 536         int size = (cmd == HDIO_GET_IDENTITY) ? (ATA_ID_WORDS * 2) : 142;
 537         int rc = 0;
 538
 539         if (drive->id_read == 0) {
 540                 rc = -ENOMSG;
 541                 goto out;
 542         }
 543
 544         id = kmalloc(size, GFP_KERNEL);
 545         if (id == NULL) {
 546                 rc = -ENOMEM;
 547                 goto out;
 548         }
 549
 550         memcpy(id, drive->id, size);
 551         ide_id_to_hd_driveid(id);
 552
 553         if (copy_to_user((void __user *)arg, id, size))
 554                 rc = -EFAULT;
 555
 556         kfree(id);
 557 out:
 558         return rc;
 559 }
 560
 561 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 562                         unsigned int cmd, unsigned long arg)
 563 {
 564         unsigned long flags;
 565         ide_driver_t *drv;
 566         int err = 0, (*getfunc)(ide_drive_t *), (*setfunc)(ide_drive_t *, int);
 567
 568         switch (cmd) {
 569         case HDIO_GET_32BIT:        getfunc = get_io_32bit;      goto read_val;
 570         case HDIO_GET_KEEPSETTINGS: getfunc = get_ksettings;     goto read_val;
 571         case HDIO_GET_UNMASKINTR:   getfunc = get_unmaskirq;     goto read_val;
 572         case HDIO_GET_DMA:          getfunc = get_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                         return ide_get_identity_ioctl(drive, cmd, arg);
 586                 case HDIO_GET_NICE:
 587                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
 588                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
 589                                         drive->nice1 << IDE_NICE_1,
 590                                         (long __user *) arg);
 591 #ifdef CONFIG_IDE_TASK_IOCTL
 592                 case HDIO_DRIVE_TASKFILE:
 593                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 594                                 return -EACCES;
 595                         switch(drive->media) {
 596                                 case ide_disk:
 597                                         return ide_taskfile_ioctl(drive, cmd, arg);
 598                                 default:
 599                                         return -ENOMSG;
 600                         }
 601 #endif /* CONFIG_IDE_TASK_IOCTL */
 602
 603                 case HDIO_DRIVE_CMD:
 604                         if (!capable(CAP_SYS_RAWIO))
 605                                 return -EACCES;
 606                         return ide_cmd_ioctl(drive, cmd, arg);
 607
 608                 case HDIO_DRIVE_TASK:
 609                         if (!capable(CAP_SYS_RAWIO))
 610                                 return -EACCES;
 611                         return ide_task_ioctl(drive, cmd, arg);
 612                 case HDIO_SET_NICE:
 613                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
 614                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
 615                                 return -EPERM;
 616                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
 617                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
 618                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
 619                                 drive->dsc_overlap = 0;
 620                                 return -EPERM;
 621                         }
 622                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
 623                         return 0;
 624                 case HDIO_DRIVE_RESET:
 625                         if (!capable(CAP_SYS_ADMIN))
 626                                 return -EACCES;
 627
 628                         return generic_drive_reset(drive);
 629
 630                 case HDIO_GET_BUSSTATE:
 631                         if (!capable(CAP_SYS_ADMIN))
 632                                 return -EACCES;
 633                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
 634                                 return -EFAULT;
 635                         return 0;
 636
 637                 case HDIO_SET_BUSSTATE:
 638                         if (!capable(CAP_SYS_ADMIN))
 639                                 return -EACCES;
 640                         return -EOPNOTSUPP;
 641                 default:
 642                         return -EINVAL;
 643         }
 644
 645 read_val:
 646         mutex_lock(&ide_setting_mtx);
 647         spin_lock_irqsave(&ide_lock, flags);
 648         err = getfunc(drive);
 649         spin_unlock_irqrestore(&ide_lock, flags);
 650         mutex_unlock(&ide_setting_mtx);
 651         return err >= 0 ? put_user(err, (long __user *)arg) : err;
 652
 653 set_val:
 654         if (bdev != bdev->bd_contains)
 655                 err = -EINVAL;
 656         else {
 657                 if (!capable(CAP_SYS_ADMIN))
 658                         err = -EACCES;
 659                 else {
 660                         mutex_lock(&ide_setting_mtx);
 661                         err = setfunc(drive, arg);
 662                         mutex_unlock(&ide_setting_mtx);
 663                 }
 664         }
 665         return err;
 666 }
 667
 668 EXPORT_SYMBOL(generic_ide_ioctl);
 669
 670 /**
 671  * ide_device_get       -       get an additional reference to a ide_drive_t
 672  * @drive:      device to get a reference to
 673  *
 674  * Gets a reference to the ide_drive_t and increments the use count of the
 675  * underlying LLDD module.
 676  */
 677 int ide_device_get(ide_drive_t *drive)
 678 {
 679         struct device *host_dev;
 680         struct module *module;
 681
 682         if (!get_device(&drive->gendev))
 683                 return -ENXIO;
 684
 685         host_dev = drive->hwif->host->dev[0];
 686         module = host_dev ? host_dev->driver->owner : NULL;
 687
 688         if (module && !try_module_get(module)) {
 689                 put_device(&drive->gendev);
 690                 return -ENXIO;
 691         }
 692
 693         return 0;
 694 }
 695 EXPORT_SYMBOL_GPL(ide_device_get);
 696
 697 /**
 698  * ide_device_put       -       release a reference to a ide_drive_t
 699  * @drive:      device to release a reference on
 700  *
 701  * Release a reference to the ide_drive_t and decrements the use count of
 702  * the underlying LLDD module.
 703  */
 704 void ide_device_put(ide_drive_t *drive)
 705 {
 706 #ifdef CONFIG_MODULE_UNLOAD
 707         struct device *host_dev = drive->hwif->host->dev[0];
 708         struct module *module = host_dev ? host_dev->driver->owner : NULL;
 709
 710         if (module)
 711                 module_put(module);
 712 #endif
 713         put_device(&drive->gendev);
 714 }
 715 EXPORT_SYMBOL_GPL(ide_device_put);
 716
 717 static int ide_bus_match(struct device *dev, struct device_driver *drv)
 718 {
 719         return 1;
 720 }
 721
 722 static char *media_string(ide_drive_t *drive)
 723 {
 724         switch (drive->media) {
 725         case ide_disk:
 726                 return "disk";
 727         case ide_cdrom:
 728                 return "cdrom";
 729         case ide_tape:
 730                 return "tape";
 731         case ide_floppy:
 732                 return "floppy";
 733         case ide_optical:
 734                 return "optical";
 735         default:
 736                 return "UNKNOWN";
 737         }
 738 }
 739
 740 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
 741 {
 742         ide_drive_t *drive = to_ide_device(dev);
 743         return sprintf(buf, "%s\n", media_string(drive));
 744 }
 745
 746 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
 747 {
 748         ide_drive_t *drive = to_ide_device(dev);
 749         return sprintf(buf, "%s\n", drive->name);
 750 }
 751
 752 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 753 {
 754         ide_drive_t *drive = to_ide_device(dev);
 755         return sprintf(buf, "ide:m-%s\n", media_string(drive));
 756 }
 757
 758 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
 759                           char *buf)
 760 {
 761         ide_drive_t *drive = to_ide_device(dev);
 762         return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_PROD]);
 763 }
 764
 765 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
 766                              char *buf)
 767 {
 768         ide_drive_t *drive = to_ide_device(dev);
 769         return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_FW_REV]);
 770 }
 771
 772 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
 773                            char *buf)
 774 {
 775         ide_drive_t *drive = to_ide_device(dev);
 776         return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_SERNO]);
 777 }
 778
 779 static struct device_attribute ide_dev_attrs[] = {
 780         __ATTR_RO(media),
 781         __ATTR_RO(drivename),
 782         __ATTR_RO(modalias),
 783         __ATTR_RO(model),
 784         __ATTR_RO(firmware),
 785         __ATTR(serial, 0400, serial_show, NULL),
 786         __ATTR_NULL
 787 };
 788
 789 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
 790 {
 791         ide_drive_t *drive = to_ide_device(dev);
 792
 793         add_uevent_var(env, "MEDIA=%s", media_string(drive));
 794         add_uevent_var(env, "DRIVENAME=%s", drive->name);
 795         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
 796         return 0;
 797 }
 798
 799 static int generic_ide_probe(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         return drv->probe ? drv->probe(drive) : -ENODEV;
 805 }
 806
 807 static int generic_ide_remove(struct device *dev)
 808 {
 809         ide_drive_t *drive = to_ide_device(dev);
 810         ide_driver_t *drv = to_ide_driver(dev->driver);
 811
 812         if (drv->remove)
 813                 drv->remove(drive);
 814
 815         return 0;
 816 }
 817
 818 static void generic_ide_shutdown(struct device *dev)
 819 {
 820         ide_drive_t *drive = to_ide_device(dev);
 821         ide_driver_t *drv = to_ide_driver(dev->driver);
 822
 823         if (dev->driver && drv->shutdown)
 824                 drv->shutdown(drive);
 825 }
 826
 827 struct bus_type ide_bus_type = {
 828         .name           = "ide",
 829         .match          = ide_bus_match,
 830         .uevent         = ide_uevent,
 831         .probe          = generic_ide_probe,
 832         .remove         = generic_ide_remove,
 833         .shutdown       = generic_ide_shutdown,
 834         .dev_attrs      = ide_dev_attrs,
 835         .suspend        = generic_ide_suspend,
 836         .resume         = generic_ide_resume,
 837 };
 838
 839 EXPORT_SYMBOL_GPL(ide_bus_type);
 840
 841 int ide_vlb_clk;
 842 EXPORT_SYMBOL_GPL(ide_vlb_clk);
 843
 844 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
 845 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
 846
 847 int ide_pci_clk;
 848 EXPORT_SYMBOL_GPL(ide_pci_clk);
 849
 850 module_param_named(pci_clock, ide_pci_clk, int, 0);
 851 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
 852
 853 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
 854 {
 855         int a, b, i, j = 1;
 856         unsigned int *dev_param_mask = (unsigned int *)kp->arg;
 857
 858         if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
 859             sscanf(s, "%d.%d", &a, &b) != 2)
 860                 return -EINVAL;
 861
 862         i = a * MAX_DRIVES + b;
 863
 864         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 865                 return -EINVAL;
 866
 867         if (j)
 868                 *dev_param_mask |= (1 << i);
 869         else
 870                 *dev_param_mask &= (1 << i);
 871
 872         return 0;
 873 }
 874
 875 static unsigned int ide_nodma;
 876
 877 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
 878 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
 879
 880 static unsigned int ide_noflush;
 881
 882 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
 883 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
 884
 885 static unsigned int ide_noprobe;
 886
 887 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
 888 MODULE_PARM_DESC(noprobe, "skip probing for a device");
 889
 890 static unsigned int ide_nowerr;
 891
 892 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
 893 MODULE_PARM_DESC(nowerr, "ignore the ATA_DF bit for a device");
 894
 895 static unsigned int ide_cdroms;
 896
 897 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
 898 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
 899
 900 struct chs_geom {
 901         unsigned int    cyl;
 902         u8              head;
 903         u8              sect;
 904 };
 905
 906 static unsigned int ide_disks;
 907 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
 908
 909 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
 910 {
 911         int a, b, c = 0, h = 0, s = 0, i, j = 1;
 912
 913         if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
 914             sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
 915                 return -EINVAL;
 916
 917         i = a * MAX_DRIVES + b;
 918
 919         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 920                 return -EINVAL;
 921
 922         if (c > INT_MAX || h > 255 || s > 255)
 923                 return -EINVAL;
 924
 925         if (j)
 926                 ide_disks |= (1 << i);
 927         else
 928                 ide_disks &= (1 << i);
 929
 930         ide_disks_chs[i].cyl  = c;
 931         ide_disks_chs[i].head = h;
 932         ide_disks_chs[i].sect = s;
 933
 934         return 0;
 935 }
 936
 937 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
 938 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
 939
 940 static void ide_dev_apply_params(ide_drive_t *drive)
 941 {
 942         int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;
 943
 944         if (ide_nodma & (1 << i)) {
 945                 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
 946                 drive->nodma = 1;
 947         }
 948         if (ide_noflush & (1 << i)) {
 949                 printk(KERN_INFO "ide: disabling flush requests for %s\n",
 950                                  drive->name);
 951                 drive->noflush = 1;
 952         }
 953         if (ide_noprobe & (1 << i)) {
 954                 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
 955                 drive->noprobe = 1;
 956         }
 957         if (ide_nowerr & (1 << i)) {
 958                 printk(KERN_INFO "ide: ignoring the ATA_DF bit for %s\n",
 959                                  drive->name);
 960                 drive->bad_wstat = BAD_R_STAT;
 961         }
 962         if (ide_cdroms & (1 << i)) {
 963                 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
 964                 drive->present = 1;
 965                 drive->media = ide_cdrom;
 966                 /* an ATAPI device ignores DRDY */
 967                 drive->ready_stat = 0;
 968         }
 969         if (ide_disks & (1 << i)) {
 970                 drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
 971                 drive->head = drive->bios_head = ide_disks_chs[i].head;
 972                 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
 973                 drive->forced_geom = 1;
 974                 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
 975                                  drive->name,
 976                                  drive->cyl, drive->head, drive->sect);
 977                 drive->present = 1;
 978                 drive->media = ide_disk;
 979                 drive->ready_stat = ATA_DRDY;
 980         }
 981 }
 982
 983 static unsigned int ide_ignore_cable;
 984
 985 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
 986 {
 987         int i, j = 1;
 988
 989         if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
 990                 return -EINVAL;
 991
 992         if (i >= MAX_HWIFS || j < 0 || j > 1)
 993                 return -EINVAL;
 994
 995         if (j)
 996                 ide_ignore_cable |= (1 << i);
 997         else
 998                 ide_ignore_cable &= (1 << i);
 999
1000         return 0;
1001 }
1002
1003 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
1004 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
1005
1006 void ide_port_apply_params(ide_hwif_t *hwif)
1007 {
1008         int i;
1009
1010         if (ide_ignore_cable & (1 << hwif->index)) {
1011                 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
1012                                  hwif->name);
1013                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1014         }
1015
1016         for (i = 0; i < MAX_DRIVES; i++)
1017                 ide_dev_apply_params(&hwif->drives[i]);
1018 }
1019
1020 /*
1021  * This is gets invoked once during initialization, to set *everything* up
1022  */
1023 static int __init ide_init(void)
1024 {
1025         int ret;
1026
1027         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
1028
1029         ret = bus_register(&ide_bus_type);
1030         if (ret < 0) {
1031                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1032                 return ret;
1033         }
1034
1035         ide_port_class = class_create(THIS_MODULE, "ide_port");
1036         if (IS_ERR(ide_port_class)) {
1037                 ret = PTR_ERR(ide_port_class);
1038                 goto out_port_class;
1039         }
1040
1041         proc_ide_create();
1042
1043         return 0;
1044
1045 out_port_class:
1046         bus_unregister(&ide_bus_type);
1047
1048         return ret;
1049 }
1050
1051 static void __exit ide_exit(void)
1052 {
1053         proc_ide_destroy();
1054
1055         class_destroy(ide_port_class);
1056
1057         bus_unregister(&ide_bus_type);
1058 }
1059
1060 module_init(ide_init);
1061 module_exit(ide_exit);
1062
1063 MODULE_LICENSE("GPL");