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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 int set_io_32bit(ide_drive_t *drive, int arg)
 291 {
 292         if (drive->no_io_32bit)
 293                 return -EPERM;
 294
 295         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 296                 return -EINVAL;
 297
 298         if (ide_spin_wait_hwgroup(drive))
 299                 return -EBUSY;
 300
 301         drive->io_32bit = arg;
 302
 303         spin_unlock_irq(&ide_lock);
 304
 305         return 0;
 306 }
 307
 308 int set_ksettings(ide_drive_t *drive, int arg)
 309 {
 310         if (arg < 0 || arg > 1)
 311                 return -EINVAL;
 312
 313         if (ide_spin_wait_hwgroup(drive))
 314                 return -EBUSY;
 315         drive->keep_settings = arg;
 316         spin_unlock_irq(&ide_lock);
 317
 318         return 0;
 319 }
 320
 321 int set_using_dma(ide_drive_t *drive, int arg)
 322 {
 323 #ifdef CONFIG_BLK_DEV_IDEDMA
 324         ide_hwif_t *hwif = drive->hwif;
 325         int err = -EPERM;
 326
 327         if (arg < 0 || arg > 1)
 328                 return -EINVAL;
 329
 330         if (ata_id_has_dma(drive->id) == 0)
 331                 goto out;
 332
 333         if (hwif->dma_ops == NULL)
 334                 goto out;
 335
 336         err = -EBUSY;
 337         if (ide_spin_wait_hwgroup(drive))
 338                 goto out;
 339         /*
 340          * set ->busy flag, unlock and let it ride
 341          */
 342         hwif->hwgroup->busy = 1;
 343         spin_unlock_irq(&ide_lock);
 344
 345         err = 0;
 346
 347         if (arg) {
 348                 if (ide_set_dma(drive))
 349                         err = -EIO;
 350         } else
 351                 ide_dma_off(drive);
 352
 353         /*
 354          * lock, clear ->busy flag and unlock before leaving
 355          */
 356         spin_lock_irq(&ide_lock);
 357         hwif->hwgroup->busy = 0;
 358         spin_unlock_irq(&ide_lock);
 359 out:
 360         return err;
 361 #else
 362         if (arg < 0 || arg > 1)
 363                 return -EINVAL;
 364
 365         return -EPERM;
 366 #endif
 367 }
 368
 369 int set_pio_mode(ide_drive_t *drive, int arg)
 370 {
 371         struct request *rq;
 372         ide_hwif_t *hwif = drive->hwif;
 373         const struct ide_port_ops *port_ops = hwif->port_ops;
 374
 375         if (arg < 0 || arg > 255)
 376                 return -EINVAL;
 377
 378         if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
 379             (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
 380                 return -ENOSYS;
 381
 382         if (drive->special.b.set_tune)
 383                 return -EBUSY;
 384
 385         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 386         rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
 387
 388         drive->tune_req = (u8) arg;
 389         drive->special.b.set_tune = 1;
 390
 391         blk_execute_rq(drive->queue, NULL, rq, 0);
 392         blk_put_request(rq);
 393
 394         return 0;
 395 }
 396
 397 int set_unmaskirq(ide_drive_t *drive, int arg)
 398 {
 399         if (drive->no_unmask)
 400                 return -EPERM;
 401
 402         if (arg < 0 || arg > 1)
 403                 return -EINVAL;
 404
 405         if (ide_spin_wait_hwgroup(drive))
 406                 return -EBUSY;
 407         drive->unmask = arg;
 408         spin_unlock_irq(&ide_lock);
 409
 410         return 0;
 411 }
 412
 413 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 414 {
 415         ide_drive_t *drive = dev->driver_data;
 416         ide_hwif_t *hwif = HWIF(drive);
 417         struct request *rq;
 418         struct request_pm_state rqpm;
 419         ide_task_t args;
 420         int ret;
 421
 422         /* Call ACPI _GTM only once */
 423         if (!(drive->dn % 2))
 424                 ide_acpi_get_timing(hwif);
 425
 426         memset(&rqpm, 0, sizeof(rqpm));
 427         memset(&args, 0, sizeof(args));
 428         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 429         rq->cmd_type = REQ_TYPE_PM_SUSPEND;
 430         rq->special = &args;
 431         rq->data = &rqpm;
 432         rqpm.pm_step = ide_pm_state_start_suspend;
 433         if (mesg.event == PM_EVENT_PRETHAW)
 434                 mesg.event = PM_EVENT_FREEZE;
 435         rqpm.pm_state = mesg.event;
 436
 437         ret = blk_execute_rq(drive->queue, NULL, rq, 0);
 438         blk_put_request(rq);
 439         /* only call ACPI _PS3 after both drivers are suspended */
 440         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 441                  && hwif->drives[1].present)
 442                  || !hwif->drives[0].present
 443                  || !hwif->drives[1].present))
 444                 ide_acpi_set_state(hwif, 0);
 445         return ret;
 446 }
 447
 448 static int generic_ide_resume(struct device *dev)
 449 {
 450         ide_drive_t *drive = dev->driver_data;
 451         ide_hwif_t *hwif = HWIF(drive);
 452         struct request *rq;
 453         struct request_pm_state rqpm;
 454         ide_task_t args;
 455         int err;
 456
 457         /* Call ACPI _STM only once */
 458         if (!(drive->dn % 2)) {
 459                 ide_acpi_set_state(hwif, 1);
 460                 ide_acpi_push_timing(hwif);
 461         }
 462
 463         ide_acpi_exec_tfs(drive);
 464
 465         memset(&rqpm, 0, sizeof(rqpm));
 466         memset(&args, 0, sizeof(args));
 467         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 468         rq->cmd_type = REQ_TYPE_PM_RESUME;
 469         rq->cmd_flags |= REQ_PREEMPT;
 470         rq->special = &args;
 471         rq->data = &rqpm;
 472         rqpm.pm_step = ide_pm_state_start_resume;
 473         rqpm.pm_state = PM_EVENT_ON;
 474
 475         err = blk_execute_rq(drive->queue, NULL, rq, 1);
 476         blk_put_request(rq);
 477
 478         if (err == 0 && dev->driver) {
 479                 ide_driver_t *drv = to_ide_driver(dev->driver);
 480
 481                 if (drv->resume)
 482                         drv->resume(drive);
 483         }
 484
 485         return err;
 486 }
 487
 488 static int generic_drive_reset(ide_drive_t *drive)
 489 {
 490         struct request *rq;
 491         int ret = 0;
 492
 493         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 494         rq->cmd_type = REQ_TYPE_SPECIAL;
 495         rq->cmd_len = 1;
 496         rq->cmd[0] = REQ_DRIVE_RESET;
 497         rq->cmd_flags |= REQ_SOFTBARRIER;
 498         if (blk_execute_rq(drive->queue, NULL, rq, 1))
 499                 ret = rq->errors;
 500         blk_put_request(rq);
 501         return ret;
 502 }
 503
 504 static inline void ide_id_to_hd_driveid(u16 *id)
 505 {
 506 #ifdef __BIG_ENDIAN
 507         /* accessed in struct hd_driveid as 8-bit values */
 508         id[ATA_ID_MAX_MULTSECT]  = __cpu_to_le16(id[ATA_ID_MAX_MULTSECT]);
 509         id[ATA_ID_CAPABILITY]    = __cpu_to_le16(id[ATA_ID_CAPABILITY]);
 510         id[ATA_ID_OLD_PIO_MODES] = __cpu_to_le16(id[ATA_ID_OLD_PIO_MODES]);
 511         id[ATA_ID_OLD_DMA_MODES] = __cpu_to_le16(id[ATA_ID_OLD_DMA_MODES]);
 512         id[ATA_ID_MULTSECT]      = __cpu_to_le16(id[ATA_ID_MULTSECT]);
 513
 514         /* as 32-bit values */
 515         *(u32 *)&id[ATA_ID_LBA_CAPACITY] = ata_id_u32(id, ATA_ID_LBA_CAPACITY);
 516         *(u32 *)&id[ATA_ID_SPG]          = ata_id_u32(id, ATA_ID_SPG);
 517
 518         /* as 64-bit value */
 519         *(u64 *)&id[ATA_ID_LBA_CAPACITY_2] =
 520                 ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
 521 #endif
 522 }
 523
 524 static int ide_get_identity_ioctl(ide_drive_t *drive, unsigned int cmd,
 525                                   unsigned long arg)
 526 {
 527         u16 *id = NULL;
 528         int size = (cmd == HDIO_GET_IDENTITY) ? (ATA_ID_WORDS * 2) : 142;
 529         int rc = 0;
 530
 531         if (drive->id_read == 0) {
 532                 rc = -ENOMSG;
 533                 goto out;
 534         }
 535
 536         id = kmalloc(size, GFP_KERNEL);
 537         if (id == NULL) {
 538                 rc = -ENOMEM;
 539                 goto out;
 540         }
 541
 542         memcpy(id, drive->id, size);
 543         ide_id_to_hd_driveid(id);
 544
 545         if (copy_to_user((void __user *)arg, id, size))
 546                 rc = -EFAULT;
 547
 548         kfree(id);
 549 out:
 550         return rc;
 551 }
 552
 553 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 554                         unsigned int cmd, unsigned long arg)
 555 {
 556         unsigned long flags;
 557         ide_driver_t *drv;
 558         int err = 0, (*setfunc)(ide_drive_t *, int);
 559         u8 *val;
 560
 561         switch (cmd) {
 562         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
 563         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
 564         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
 565         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
 566         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
 567         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
 568         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
 569         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
 570         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
 571         }
 572
 573         switch (cmd) {
 574                 case HDIO_OBSOLETE_IDENTITY:
 575                 case HDIO_GET_IDENTITY:
 576                         if (bdev != bdev->bd_contains)
 577                                 return -EINVAL;
 578                         return ide_get_identity_ioctl(drive, cmd, arg);
 579                 case HDIO_GET_NICE:
 580                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
 581                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
 582                                         drive->nice1 << IDE_NICE_1,
 583                                         (long __user *) arg);
 584 #ifdef CONFIG_IDE_TASK_IOCTL
 585                 case HDIO_DRIVE_TASKFILE:
 586                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 587                                 return -EACCES;
 588                         switch(drive->media) {
 589                                 case ide_disk:
 590                                         return ide_taskfile_ioctl(drive, cmd, arg);
 591                                 default:
 592                                         return -ENOMSG;
 593                         }
 594 #endif /* CONFIG_IDE_TASK_IOCTL */
 595
 596                 case HDIO_DRIVE_CMD:
 597                         if (!capable(CAP_SYS_RAWIO))
 598                                 return -EACCES;
 599                         return ide_cmd_ioctl(drive, cmd, arg);
 600
 601                 case HDIO_DRIVE_TASK:
 602                         if (!capable(CAP_SYS_RAWIO))
 603                                 return -EACCES;
 604                         return ide_task_ioctl(drive, cmd, arg);
 605                 case HDIO_SET_NICE:
 606                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
 607                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
 608                                 return -EPERM;
 609                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
 610                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
 611                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
 612                                 drive->dsc_overlap = 0;
 613                                 return -EPERM;
 614                         }
 615                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
 616                         return 0;
 617                 case HDIO_DRIVE_RESET:
 618                         if (!capable(CAP_SYS_ADMIN))
 619                                 return -EACCES;
 620
 621                         return generic_drive_reset(drive);
 622
 623                 case HDIO_GET_BUSSTATE:
 624                         if (!capable(CAP_SYS_ADMIN))
 625                                 return -EACCES;
 626                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
 627                                 return -EFAULT;
 628                         return 0;
 629
 630                 case HDIO_SET_BUSSTATE:
 631                         if (!capable(CAP_SYS_ADMIN))
 632                                 return -EACCES;
 633                         return -EOPNOTSUPP;
 634                 default:
 635                         return -EINVAL;
 636         }
 637
 638 read_val:
 639         mutex_lock(&ide_setting_mtx);
 640         spin_lock_irqsave(&ide_lock, flags);
 641         err = *val;
 642         spin_unlock_irqrestore(&ide_lock, flags);
 643         mutex_unlock(&ide_setting_mtx);
 644         return err >= 0 ? put_user(err, (long __user *)arg) : err;
 645
 646 set_val:
 647         if (bdev != bdev->bd_contains)
 648                 err = -EINVAL;
 649         else {
 650                 if (!capable(CAP_SYS_ADMIN))
 651                         err = -EACCES;
 652                 else {
 653                         mutex_lock(&ide_setting_mtx);
 654                         err = setfunc(drive, arg);
 655                         mutex_unlock(&ide_setting_mtx);
 656                 }
 657         }
 658         return err;
 659 }
 660
 661 EXPORT_SYMBOL(generic_ide_ioctl);
 662
 663 /**
 664  * ide_device_get       -       get an additional reference to a ide_drive_t
 665  * @drive:      device to get a reference to
 666  *
 667  * Gets a reference to the ide_drive_t and increments the use count of the
 668  * underlying LLDD module.
 669  */
 670 int ide_device_get(ide_drive_t *drive)
 671 {
 672         struct device *host_dev;
 673         struct module *module;
 674
 675         if (!get_device(&drive->gendev))
 676                 return -ENXIO;
 677
 678         host_dev = drive->hwif->host->dev[0];
 679         module = host_dev ? host_dev->driver->owner : NULL;
 680
 681         if (module && !try_module_get(module)) {
 682                 put_device(&drive->gendev);
 683                 return -ENXIO;
 684         }
 685
 686         return 0;
 687 }
 688 EXPORT_SYMBOL_GPL(ide_device_get);
 689
 690 /**
 691  * ide_device_put       -       release a reference to a ide_drive_t
 692  * @drive:      device to release a reference on
 693  *
 694  * Release a reference to the ide_drive_t and decrements the use count of
 695  * the underlying LLDD module.
 696  */
 697 void ide_device_put(ide_drive_t *drive)
 698 {
 699 #ifdef CONFIG_MODULE_UNLOAD
 700         struct device *host_dev = drive->hwif->host->dev[0];
 701         struct module *module = host_dev ? host_dev->driver->owner : NULL;
 702
 703         if (module)
 704                 module_put(module);
 705 #endif
 706         put_device(&drive->gendev);
 707 }
 708 EXPORT_SYMBOL_GPL(ide_device_put);
 709
 710 static int ide_bus_match(struct device *dev, struct device_driver *drv)
 711 {
 712         return 1;
 713 }
 714
 715 static char *media_string(ide_drive_t *drive)
 716 {
 717         switch (drive->media) {
 718         case ide_disk:
 719                 return "disk";
 720         case ide_cdrom:
 721                 return "cdrom";
 722         case ide_tape:
 723                 return "tape";
 724         case ide_floppy:
 725                 return "floppy";
 726         case ide_optical:
 727                 return "optical";
 728         default:
 729                 return "UNKNOWN";
 730         }
 731 }
 732
 733 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
 734 {
 735         ide_drive_t *drive = to_ide_device(dev);
 736         return sprintf(buf, "%s\n", media_string(drive));
 737 }
 738
 739 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
 740 {
 741         ide_drive_t *drive = to_ide_device(dev);
 742         return sprintf(buf, "%s\n", drive->name);
 743 }
 744
 745 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 746 {
 747         ide_drive_t *drive = to_ide_device(dev);
 748         return sprintf(buf, "ide:m-%s\n", media_string(drive));
 749 }
 750
 751 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
 752                           char *buf)
 753 {
 754         ide_drive_t *drive = to_ide_device(dev);
 755         return sprintf(buf, "%s\n", (char *)&drive->id[ATA_ID_PROD]);
 756 }
 757
 758 static ssize_t firmware_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_FW_REV]);
 763 }
 764
 765 static ssize_t serial_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_SERNO]);
 770 }
 771
 772 static struct device_attribute ide_dev_attrs[] = {
 773         __ATTR_RO(media),
 774         __ATTR_RO(drivename),
 775         __ATTR_RO(modalias),
 776         __ATTR_RO(model),
 777         __ATTR_RO(firmware),
 778         __ATTR(serial, 0400, serial_show, NULL),
 779         __ATTR_NULL
 780 };
 781
 782 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
 783 {
 784         ide_drive_t *drive = to_ide_device(dev);
 785
 786         add_uevent_var(env, "MEDIA=%s", media_string(drive));
 787         add_uevent_var(env, "DRIVENAME=%s", drive->name);
 788         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
 789         return 0;
 790 }
 791
 792 static int generic_ide_probe(struct device *dev)
 793 {
 794         ide_drive_t *drive = to_ide_device(dev);
 795         ide_driver_t *drv = to_ide_driver(dev->driver);
 796
 797         return drv->probe ? drv->probe(drive) : -ENODEV;
 798 }
 799
 800 static int generic_ide_remove(struct device *dev)
 801 {
 802         ide_drive_t *drive = to_ide_device(dev);
 803         ide_driver_t *drv = to_ide_driver(dev->driver);
 804
 805         if (drv->remove)
 806                 drv->remove(drive);
 807
 808         return 0;
 809 }
 810
 811 static void generic_ide_shutdown(struct device *dev)
 812 {
 813         ide_drive_t *drive = to_ide_device(dev);
 814         ide_driver_t *drv = to_ide_driver(dev->driver);
 815
 816         if (dev->driver && drv->shutdown)
 817                 drv->shutdown(drive);
 818 }
 819
 820 struct bus_type ide_bus_type = {
 821         .name           = "ide",
 822         .match          = ide_bus_match,
 823         .uevent         = ide_uevent,
 824         .probe          = generic_ide_probe,
 825         .remove         = generic_ide_remove,
 826         .shutdown       = generic_ide_shutdown,
 827         .dev_attrs      = ide_dev_attrs,
 828         .suspend        = generic_ide_suspend,
 829         .resume         = generic_ide_resume,
 830 };
 831
 832 EXPORT_SYMBOL_GPL(ide_bus_type);
 833
 834 int ide_vlb_clk;
 835 EXPORT_SYMBOL_GPL(ide_vlb_clk);
 836
 837 module_param_named(vlb_clock, ide_vlb_clk, int, 0);
 838 MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
 839
 840 int ide_pci_clk;
 841 EXPORT_SYMBOL_GPL(ide_pci_clk);
 842
 843 module_param_named(pci_clock, ide_pci_clk, int, 0);
 844 MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
 845
 846 static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
 847 {
 848         int a, b, i, j = 1;
 849         unsigned int *dev_param_mask = (unsigned int *)kp->arg;
 850
 851         if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
 852             sscanf(s, "%d.%d", &a, &b) != 2)
 853                 return -EINVAL;
 854
 855         i = a * MAX_DRIVES + b;
 856
 857         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 858                 return -EINVAL;
 859
 860         if (j)
 861                 *dev_param_mask |= (1 << i);
 862         else
 863                 *dev_param_mask &= (1 << i);
 864
 865         return 0;
 866 }
 867
 868 static unsigned int ide_nodma;
 869
 870 module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
 871 MODULE_PARM_DESC(nodma, "disallow DMA for a device");
 872
 873 static unsigned int ide_noflush;
 874
 875 module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
 876 MODULE_PARM_DESC(noflush, "disable flush requests for a device");
 877
 878 static unsigned int ide_noprobe;
 879
 880 module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
 881 MODULE_PARM_DESC(noprobe, "skip probing for a device");
 882
 883 static unsigned int ide_nowerr;
 884
 885 module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
 886 MODULE_PARM_DESC(nowerr, "ignore the ATA_DF bit for a device");
 887
 888 static unsigned int ide_cdroms;
 889
 890 module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
 891 MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
 892
 893 struct chs_geom {
 894         unsigned int    cyl;
 895         u8              head;
 896         u8              sect;
 897 };
 898
 899 static unsigned int ide_disks;
 900 static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
 901
 902 static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
 903 {
 904         int a, b, c = 0, h = 0, s = 0, i, j = 1;
 905
 906         if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
 907             sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
 908                 return -EINVAL;
 909
 910         i = a * MAX_DRIVES + b;
 911
 912         if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
 913                 return -EINVAL;
 914
 915         if (c > INT_MAX || h > 255 || s > 255)
 916                 return -EINVAL;
 917
 918         if (j)
 919                 ide_disks |= (1 << i);
 920         else
 921                 ide_disks &= (1 << i);
 922
 923         ide_disks_chs[i].cyl  = c;
 924         ide_disks_chs[i].head = h;
 925         ide_disks_chs[i].sect = s;
 926
 927         return 0;
 928 }
 929
 930 module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
 931 MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
 932
 933 static void ide_dev_apply_params(ide_drive_t *drive)
 934 {
 935         int i = drive->hwif->index * MAX_DRIVES + drive->select.b.unit;
 936
 937         if (ide_nodma & (1 << i)) {
 938                 printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
 939                 drive->nodma = 1;
 940         }
 941         if (ide_noflush & (1 << i)) {
 942                 printk(KERN_INFO "ide: disabling flush requests for %s\n",
 943                                  drive->name);
 944                 drive->noflush = 1;
 945         }
 946         if (ide_noprobe & (1 << i)) {
 947                 printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
 948                 drive->noprobe = 1;
 949         }
 950         if (ide_nowerr & (1 << i)) {
 951                 printk(KERN_INFO "ide: ignoring the ATA_DF bit for %s\n",
 952                                  drive->name);
 953                 drive->bad_wstat = BAD_R_STAT;
 954         }
 955         if (ide_cdroms & (1 << i)) {
 956                 printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
 957                 drive->present = 1;
 958                 drive->media = ide_cdrom;
 959                 /* an ATAPI device ignores DRDY */
 960                 drive->ready_stat = 0;
 961         }
 962         if (ide_disks & (1 << i)) {
 963                 drive->cyl  = drive->bios_cyl  = ide_disks_chs[i].cyl;
 964                 drive->head = drive->bios_head = ide_disks_chs[i].head;
 965                 drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
 966                 drive->forced_geom = 1;
 967                 printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
 968                                  drive->name,
 969                                  drive->cyl, drive->head, drive->sect);
 970                 drive->present = 1;
 971                 drive->media = ide_disk;
 972                 drive->ready_stat = ATA_DRDY;
 973         }
 974 }
 975
 976 static unsigned int ide_ignore_cable;
 977
 978 static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
 979 {
 980         int i, j = 1;
 981
 982         if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
 983                 return -EINVAL;
 984
 985         if (i >= MAX_HWIFS || j < 0 || j > 1)
 986                 return -EINVAL;
 987
 988         if (j)
 989                 ide_ignore_cable |= (1 << i);
 990         else
 991                 ide_ignore_cable &= (1 << i);
 992
 993         return 0;
 994 }
 995
 996 module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
 997 MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
 998
 999 void ide_port_apply_params(ide_hwif_t *hwif)
1000 {
1001         int i;
1002
1003         if (ide_ignore_cable & (1 << hwif->index)) {
1004                 printk(KERN_INFO "ide: ignoring cable detection for %s\n",
1005                                  hwif->name);
1006                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1007         }
1008
1009         for (i = 0; i < MAX_DRIVES; i++)
1010                 ide_dev_apply_params(&hwif->drives[i]);
1011 }
1012
1013 /*
1014  * This is gets invoked once during initialization, to set *everything* up
1015  */
1016 static int __init ide_init(void)
1017 {
1018         int ret;
1019
1020         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
1021
1022         ret = bus_register(&ide_bus_type);
1023         if (ret < 0) {
1024                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1025                 return ret;
1026         }
1027
1028         ide_port_class = class_create(THIS_MODULE, "ide_port");
1029         if (IS_ERR(ide_port_class)) {
1030                 ret = PTR_ERR(ide_port_class);
1031                 goto out_port_class;
1032         }
1033
1034         proc_ide_create();
1035
1036         return 0;
1037
1038 out_port_class:
1039         bus_unregister(&ide_bus_type);
1040
1041         return ret;
1042 }
1043
1044 static void __exit ide_exit(void)
1045 {
1046         proc_ide_destroy();
1047
1048         class_destroy(ide_port_class);
1049
1050         bus_unregister(&ide_bus_type);
1051 }
1052
1053 module_init(ide_init);
1054 module_exit(ide_exit);
1055
1056 MODULE_LICENSE("GPL");