drivers/ide/ide.c

   1 /*
   2  *  Copyright (C) 1994-1998         Linus Torvalds & authors (see below)
   3  *  Copyrifht (C) 2003-2005, 2007   Bartlomiej Zolnierkiewicz
   4  */
   5
   6 /*
   7  *  Mostly written by Mark Lord  <mlord@pobox.com>
   8  *                and Gadi Oxman <gadio@netvision.net.il>
   9  *                and Andre Hedrick <andre@linux-ide.org>
  10  *
  11  *  See linux/MAINTAINERS for address of current maintainer.
  12  *
  13  * This is the multiple IDE interface driver, as evolved from hd.c.
  14  * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
  15  *   (usually 14 & 15).
  16  * There can be up to two drives per interface, as per the ATA-2 spec.
  17  *
  18  * ...
  19  *
  20  *  From hd.c:
  21  *  |
  22  *  | It traverses the request-list, using interrupts to jump between functions.
  23  *  | As nearly all functions can be called within interrupts, we may not sleep.
  24  *  | Special care is recommended.  Have Fun!
  25  *  |
  26  *  | modified by Drew Eckhardt to check nr of hd's from the CMOS.
  27  *  |
  28  *  | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
  29  *  | in the early extended-partition checks and added DM partitions.
  30  *  |
  31  *  | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
  32  *  |
  33  *  | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
  34  *  | and general streamlining by Mark Lord (mlord@pobox.com).
  35  *
  36  *  October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
  37  *
  38  *      Mark Lord       (mlord@pobox.com)               (IDE Perf.Pkg)
  39  *      Delman Lee      (delman@ieee.org)               ("Mr. atdisk2")
  40  *      Scott Snyder    (snyder@fnald0.fnal.gov)        (ATAPI IDE cd-rom)
  41  *
  42  *  This was a rewrite of just about everything from hd.c, though some original
  43  *  code is still sprinkled about.  Think of it as a major evolution, with
  44  *  inspiration from lots of linux users, esp.  hamish@zot.apana.org.au
  45  */
  46
  47 #define _IDE_C                  /* Tell ide.h it's really us */
  48
  49 #include <linux/module.h>
  50 #include <linux/types.h>
  51 #include <linux/string.h>
  52 #include <linux/kernel.h>
  53 #include <linux/timer.h>
  54 #include <linux/mm.h>
  55 #include <linux/interrupt.h>
  56 #include <linux/major.h>
  57 #include <linux/errno.h>
  58 #include <linux/genhd.h>
  59 #include <linux/blkpg.h>
  60 #include <linux/slab.h>
  61 #include <linux/init.h>
  62 #include <linux/pci.h>
  63 #include <linux/delay.h>
  64 #include <linux/ide.h>
  65 #include <linux/completion.h>
  66 #include <linux/reboot.h>
  67 #include <linux/cdrom.h>
  68 #include <linux/seq_file.h>
  69 #include <linux/device.h>
  70 #include <linux/bitops.h>
  71
  72 #include <asm/byteorder.h>
  73 #include <asm/irq.h>
  74 #include <asm/uaccess.h>
  75 #include <asm/io.h>
  76
  77
  78 /* default maximum number of failures */
  79 #define IDE_DEFAULT_MAX_FAILURES        1
  80
  81 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
  82                                         IDE2_MAJOR, IDE3_MAJOR,
  83                                         IDE4_MAJOR, IDE5_MAJOR,
  84                                         IDE6_MAJOR, IDE7_MAJOR,
  85                                         IDE8_MAJOR, IDE9_MAJOR };
  86
  87 static int idebus_parameter;    /* holds the "idebus=" parameter */
  88 static int system_bus_speed;    /* holds what we think is VESA/PCI bus speed */
  89
  90 DEFINE_MUTEX(ide_cfg_mtx);
  91  __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
  92
  93 int noautodma = 0;
  94
  95 #ifdef CONFIG_BLK_DEV_IDEACPI
  96 int ide_noacpi = 0;
  97 int ide_noacpitfs = 1;
  98 int ide_noacpionboot = 1;
  99 #endif
 100
 101 /*
 102  * This is declared extern in ide.h, for access by other IDE modules:
 103  */
 104 ide_hwif_t ide_hwifs[MAX_HWIFS];        /* master data repository */
 105
 106 EXPORT_SYMBOL(ide_hwifs);
 107
 108 static void ide_port_init_devices_data(ide_hwif_t *);
 109
 110 /*
 111  * Do not even *think* about calling this!
 112  */
 113 void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
 114 {
 115         /* bulk initialize hwif & drive info with zeros */
 116         memset(hwif, 0, sizeof(ide_hwif_t));
 117
 118         /* fill in any non-zero initial values */
 119         hwif->index     = index;
 120         hwif->major     = ide_hwif_to_major[index];
 121
 122         hwif->name[0]   = 'i';
 123         hwif->name[1]   = 'd';
 124         hwif->name[2]   = 'e';
 125         hwif->name[3]   = '0' + index;
 126
 127         hwif->bus_state = BUSSTATE_ON;
 128
 129         init_completion(&hwif->gendev_rel_comp);
 130
 131         default_hwif_iops(hwif);
 132         default_hwif_transport(hwif);
 133
 134         ide_port_init_devices_data(hwif);
 135 }
 136 EXPORT_SYMBOL_GPL(ide_init_port_data);
 137
 138 static void ide_port_init_devices_data(ide_hwif_t *hwif)
 139 {
 140         int unit;
 141
 142         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 143                 ide_drive_t *drive = &hwif->drives[unit];
 144                 u8 j = (hwif->index * MAX_DRIVES) + unit;
 145
 146                 memset(drive, 0, sizeof(*drive));
 147
 148                 drive->media                    = ide_disk;
 149                 drive->select.all               = (unit<<4)|0xa0;
 150                 drive->hwif                     = hwif;
 151                 drive->ctl                      = 0x08;
 152                 drive->ready_stat               = READY_STAT;
 153                 drive->bad_wstat                = BAD_W_STAT;
 154                 drive->special.b.recalibrate    = 1;
 155                 drive->special.b.set_geometry   = 1;
 156                 drive->name[0]                  = 'h';
 157                 drive->name[1]                  = 'd';
 158                 drive->name[2]                  = 'a' + j;
 159                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
 160
 161                 INIT_LIST_HEAD(&drive->list);
 162                 init_completion(&drive->gendev_rel_comp);
 163         }
 164 }
 165
 166
 167 static void init_hwif_default(ide_hwif_t *hwif, unsigned int index)
 168 {
 169         hw_regs_t hw;
 170
 171         memset(&hw, 0, sizeof(hw_regs_t));
 172
 173         ide_init_hwif_ports(&hw, ide_default_io_base(index), 0, &hwif->irq);
 174
 175         memcpy(hwif->io_ports, hw.io_ports, sizeof(hw.io_ports));
 176
 177         hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
 178 #ifdef CONFIG_BLK_DEV_HD
 179         if (hwif->io_ports[IDE_DATA_OFFSET] == HD_DATA)
 180                 hwif->noprobe = 1;      /* may be overridden by ide_setup() */
 181 #endif
 182 }
 183
 184 /*
 185  * init_ide_data() sets reasonable default values into all fields
 186  * of all instances of the hwifs and drives, but only on the first call.
 187  * Subsequent calls have no effect (they don't wipe out anything).
 188  *
 189  * This routine is normally called at driver initialization time,
 190  * but may also be called MUCH earlier during kernel "command-line"
 191  * parameter processing.  As such, we cannot depend on any other parts
 192  * of the kernel (such as memory allocation) to be functioning yet.
 193  *
 194  * This is too bad, as otherwise we could dynamically allocate the
 195  * ide_drive_t structs as needed, rather than always consuming memory
 196  * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
 197  *
 198  * FIXME: We should stuff the setup data into __init and copy the
 199  * relevant hwifs/allocate them properly during boot.
 200  */
 201 #define MAGIC_COOKIE 0x12345678
 202 static void __init init_ide_data (void)
 203 {
 204         ide_hwif_t *hwif;
 205         unsigned int index;
 206         static unsigned long magic_cookie = MAGIC_COOKIE;
 207
 208         if (magic_cookie != MAGIC_COOKIE)
 209                 return;         /* already initialized */
 210         magic_cookie = 0;
 211
 212         /* Initialise all interface structures */
 213         for (index = 0; index < MAX_HWIFS; ++index) {
 214                 hwif = &ide_hwifs[index];
 215                 ide_init_port_data(hwif, index);
 216                 init_hwif_default(hwif, index);
 217 #if !defined(CONFIG_PPC32) || !defined(CONFIG_PCI)
 218                 hwif->irq =
 219                         ide_init_default_irq(hwif->io_ports[IDE_DATA_OFFSET]);
 220 #endif
 221         }
 222 }
 223
 224 /**
 225  *      ide_system_bus_speed    -       guess bus speed
 226  *
 227  *      ide_system_bus_speed() returns what we think is the system VESA/PCI
 228  *      bus speed (in MHz). This is used for calculating interface PIO timings.
 229  *      The default is 40 for known PCI systems, 50 otherwise.
 230  *      The "idebus=xx" parameter can be used to override this value.
 231  *      The actual value to be used is computed/displayed the first time
 232  *      through. Drivers should only use this as a last resort.
 233  *
 234  *      Returns a guessed speed in MHz.
 235  */
 236
 237 static int ide_system_bus_speed(void)
 238 {
 239 #ifdef CONFIG_PCI
 240         static struct pci_device_id pci_default[] = {
 241                 { PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID) },
 242                 { }
 243         };
 244 #else
 245 #define pci_default 0
 246 #endif /* CONFIG_PCI */
 247
 248         /* user supplied value */
 249         if (idebus_parameter)
 250                 return idebus_parameter;
 251
 252         /* safe default value for PCI or VESA and PCI*/
 253         return pci_dev_present(pci_default) ? 33 : 50;
 254 }
 255
 256 ide_hwif_t * ide_find_port(unsigned long base)
 257 {
 258         ide_hwif_t *hwif;
 259         int i;
 260
 261         for (i = 0; i < MAX_HWIFS; i++) {
 262                 hwif = &ide_hwifs[i];
 263                 if (hwif->io_ports[IDE_DATA_OFFSET] == base)
 264                         goto found;
 265         }
 266
 267         for (i = 0; i < MAX_HWIFS; i++) {
 268                 hwif = &ide_hwifs[i];
 269                 if (hwif->chipset == ide_unknown)
 270                         goto found;
 271         }
 272
 273         hwif = NULL;
 274 found:
 275         return hwif;
 276 }
 277
 278 EXPORT_SYMBOL_GPL(ide_find_port);
 279
 280 static struct resource* hwif_request_region(ide_hwif_t *hwif,
 281                                             unsigned long addr, int num)
 282 {
 283         struct resource *res = request_region(addr, num, hwif->name);
 284
 285         if (!res)
 286                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
 287                                 hwif->name, addr, addr+num-1);
 288         return res;
 289 }
 290
 291 /**
 292  *      ide_hwif_request_regions - request resources for IDE
 293  *      @hwif: interface to use
 294  *
 295  *      Requests all the needed resources for an interface.
 296  *      Right now core IDE code does this work which is deeply wrong.
 297  *      MMIO leaves it to the controller driver,
 298  *      PIO will migrate this way over time.
 299  */
 300
 301 int ide_hwif_request_regions(ide_hwif_t *hwif)
 302 {
 303         unsigned long addr;
 304         unsigned int i;
 305
 306         if (hwif->mmio)
 307                 return 0;
 308         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 309         if (addr && !hwif_request_region(hwif, addr, 1))
 310                 goto control_region_busy;
 311         hwif->straight8 = 0;
 312         addr = hwif->io_ports[IDE_DATA_OFFSET];
 313         if ((addr | 7) == hwif->io_ports[IDE_STATUS_OFFSET]) {
 314                 if (!hwif_request_region(hwif, addr, 8))
 315                         goto data_region_busy;
 316                 hwif->straight8 = 1;
 317                 return 0;
 318         }
 319         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
 320                 addr = hwif->io_ports[i];
 321                 if (!hwif_request_region(hwif, addr, 1)) {
 322                         while (--i)
 323                                 release_region(addr, 1);
 324                         goto data_region_busy;
 325                 }
 326         }
 327         return 0;
 328
 329 data_region_busy:
 330         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 331         if (addr)
 332                 release_region(addr, 1);
 333 control_region_busy:
 334         /* If any errors are return, we drop the hwif interface. */
 335         return -EBUSY;
 336 }
 337
 338 /**
 339  *      ide_hwif_release_regions - free IDE resources
 340  *
 341  *      Note that we only release the standard ports,
 342  *      and do not even try to handle any extra ports
 343  *      allocated for weird IDE interface chipsets.
 344  *
 345  *      Note also that we don't yet handle mmio resources here. More
 346  *      importantly our caller should be doing this so we need to
 347  *      restructure this as a helper function for drivers.
 348  */
 349
 350 void ide_hwif_release_regions(ide_hwif_t *hwif)
 351 {
 352         u32 i = 0;
 353
 354         if (hwif->mmio)
 355                 return;
 356         if (hwif->io_ports[IDE_CONTROL_OFFSET])
 357                 release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
 358         if (hwif->straight8) {
 359                 release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
 360                 return;
 361         }
 362         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
 363                 if (hwif->io_ports[i])
 364                         release_region(hwif->io_ports[i], 1);
 365 }
 366
 367 /**
 368  *      ide_hwif_restore        -       restore hwif to template
 369  *      @hwif: hwif to update
 370  *      @tmp_hwif: template
 371  *
 372  *      Restore hwif to a previous state by copying most settings
 373  *      from the template.
 374  */
 375
 376 static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
 377 {
 378         hwif->hwgroup                   = tmp_hwif->hwgroup;
 379
 380         hwif->gendev.parent             = tmp_hwif->gendev.parent;
 381
 382         hwif->proc                      = tmp_hwif->proc;
 383
 384         hwif->major                     = tmp_hwif->major;
 385         hwif->straight8                 = tmp_hwif->straight8;
 386         hwif->bus_state                 = tmp_hwif->bus_state;
 387
 388         hwif->host_flags                = tmp_hwif->host_flags;
 389
 390         hwif->pio_mask                  = tmp_hwif->pio_mask;
 391
 392         hwif->ultra_mask                = tmp_hwif->ultra_mask;
 393         hwif->mwdma_mask                = tmp_hwif->mwdma_mask;
 394         hwif->swdma_mask                = tmp_hwif->swdma_mask;
 395
 396         hwif->cbl                       = tmp_hwif->cbl;
 397
 398         hwif->chipset                   = tmp_hwif->chipset;
 399         hwif->hold                      = tmp_hwif->hold;
 400
 401         hwif->dev                       = tmp_hwif->dev;
 402
 403 #ifdef CONFIG_BLK_DEV_IDEPCI
 404         hwif->cds                       = tmp_hwif->cds;
 405 #endif
 406
 407         hwif->set_pio_mode              = tmp_hwif->set_pio_mode;
 408         hwif->set_dma_mode              = tmp_hwif->set_dma_mode;
 409         hwif->mdma_filter               = tmp_hwif->mdma_filter;
 410         hwif->udma_filter               = tmp_hwif->udma_filter;
 411         hwif->selectproc                = tmp_hwif->selectproc;
 412         hwif->reset_poll                = tmp_hwif->reset_poll;
 413         hwif->pre_reset                 = tmp_hwif->pre_reset;
 414         hwif->resetproc                 = tmp_hwif->resetproc;
 415         hwif->maskproc                  = tmp_hwif->maskproc;
 416         hwif->quirkproc                 = tmp_hwif->quirkproc;
 417
 418         hwif->ata_input_data            = tmp_hwif->ata_input_data;
 419         hwif->ata_output_data           = tmp_hwif->ata_output_data;
 420         hwif->atapi_input_bytes         = tmp_hwif->atapi_input_bytes;
 421         hwif->atapi_output_bytes        = tmp_hwif->atapi_output_bytes;
 422
 423         hwif->dma_host_set              = tmp_hwif->dma_host_set;
 424         hwif->dma_setup                 = tmp_hwif->dma_setup;
 425         hwif->dma_exec_cmd              = tmp_hwif->dma_exec_cmd;
 426         hwif->dma_start                 = tmp_hwif->dma_start;
 427         hwif->ide_dma_end               = tmp_hwif->ide_dma_end;
 428         hwif->ide_dma_test_irq          = tmp_hwif->ide_dma_test_irq;
 429         hwif->ide_dma_clear_irq         = tmp_hwif->ide_dma_clear_irq;
 430         hwif->dma_lost_irq              = tmp_hwif->dma_lost_irq;
 431         hwif->dma_timeout               = tmp_hwif->dma_timeout;
 432
 433         hwif->OUTB                      = tmp_hwif->OUTB;
 434         hwif->OUTBSYNC                  = tmp_hwif->OUTBSYNC;
 435         hwif->OUTW                      = tmp_hwif->OUTW;
 436         hwif->OUTSW                     = tmp_hwif->OUTSW;
 437         hwif->OUTSL                     = tmp_hwif->OUTSL;
 438
 439         hwif->INB                       = tmp_hwif->INB;
 440         hwif->INW                       = tmp_hwif->INW;
 441         hwif->INSW                      = tmp_hwif->INSW;
 442         hwif->INSL                      = tmp_hwif->INSL;
 443
 444         hwif->sg_max_nents              = tmp_hwif->sg_max_nents;
 445
 446         hwif->mmio                      = tmp_hwif->mmio;
 447         hwif->rqsize                    = tmp_hwif->rqsize;
 448
 449 #ifndef CONFIG_BLK_DEV_IDECS
 450         hwif->irq                       = tmp_hwif->irq;
 451 #endif
 452
 453         hwif->dma_base                  = tmp_hwif->dma_base;
 454         hwif->dma_command               = tmp_hwif->dma_command;
 455         hwif->dma_vendor1               = tmp_hwif->dma_vendor1;
 456         hwif->dma_status                = tmp_hwif->dma_status;
 457         hwif->dma_vendor3               = tmp_hwif->dma_vendor3;
 458         hwif->dma_prdtable              = tmp_hwif->dma_prdtable;
 459
 460         hwif->config_data               = tmp_hwif->config_data;
 461         hwif->select_data               = tmp_hwif->select_data;
 462         hwif->extra_base                = tmp_hwif->extra_base;
 463         hwif->extra_ports               = tmp_hwif->extra_ports;
 464
 465         hwif->hwif_data                 = tmp_hwif->hwif_data;
 466 }
 467
 468 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
 469 {
 470         ide_hwgroup_t *hwgroup = hwif->hwgroup;
 471
 472         spin_lock_irq(&ide_lock);
 473         /*
 474          * Remove us from the hwgroup, and free
 475          * the hwgroup if we were the only member
 476          */
 477         if (hwif->next == hwif) {
 478                 BUG_ON(hwgroup->hwif != hwif);
 479                 kfree(hwgroup);
 480         } else {
 481                 /* There is another interface in hwgroup.
 482                  * Unlink us, and set hwgroup->drive and ->hwif to
 483                  * something sane.
 484                  */
 485                 ide_hwif_t *g = hwgroup->hwif;
 486
 487                 while (g->next != hwif)
 488                         g = g->next;
 489                 g->next = hwif->next;
 490                 if (hwgroup->hwif == hwif) {
 491                         /* Chose a random hwif for hwgroup->hwif.
 492                          * It's guaranteed that there are no drives
 493                          * left in the hwgroup.
 494                          */
 495                         BUG_ON(hwgroup->drive != NULL);
 496                         hwgroup->hwif = g;
 497                 }
 498                 BUG_ON(hwgroup->hwif == hwif);
 499         }
 500         spin_unlock_irq(&ide_lock);
 501 }
 502
 503 /* Called with ide_lock held. */
 504 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
 505 {
 506         int i;
 507
 508         for (i = 0; i < MAX_DRIVES; i++) {
 509                 ide_drive_t *drive = &hwif->drives[i];
 510
 511                 if (drive->present) {
 512                         spin_unlock_irq(&ide_lock);
 513                         device_unregister(&drive->gendev);
 514                         wait_for_completion(&drive->gendev_rel_comp);
 515                         spin_lock_irq(&ide_lock);
 516                 }
 517         }
 518 }
 519
 520 void ide_port_unregister_devices(ide_hwif_t *hwif)
 521 {
 522         mutex_lock(&ide_cfg_mtx);
 523         spin_lock_irq(&ide_lock);
 524         __ide_port_unregister_devices(hwif);
 525         hwif->present = 0;
 526         ide_port_init_devices_data(hwif);
 527         spin_unlock_irq(&ide_lock);
 528         mutex_unlock(&ide_cfg_mtx);
 529 }
 530 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
 531
 532 /**
 533  *      ide_unregister          -       free an IDE interface
 534  *      @index: index of interface (will change soon to a pointer)
 535  *      @init_default: init default hwif flag
 536  *      @restore: restore hwif flag
 537  *
 538  *      Perform the final unregister of an IDE interface. At the moment
 539  *      we don't refcount interfaces so this will also get split up.
 540  *
 541  *      Locking:
 542  *      The caller must not hold the IDE locks
 543  *      The drive present/vanishing is not yet properly locked
 544  *      Take care with the callbacks. These have been split to avoid
 545  *      deadlocking the IDE layer. The shutdown callback is called
 546  *      before we take the lock and free resources. It is up to the
 547  *      caller to be sure there is no pending I/O here, and that
 548  *      the interface will not be reopened (present/vanishing locking
 549  *      isn't yet done BTW). After we commit to the final kill we
 550  *      call the cleanup callback with the ide locks held.
 551  *
 552  *      Unregister restores the hwif structures to the default state.
 553  *      This is raving bonkers.
 554  */
 555
 556 void ide_unregister(unsigned int index, int init_default, int restore)
 557 {
 558         ide_hwif_t *hwif, *g;
 559         static ide_hwif_t tmp_hwif; /* protected by ide_cfg_mtx */
 560         ide_hwgroup_t *hwgroup;
 561         int irq_count = 0;
 562
 563         BUG_ON(index >= MAX_HWIFS);
 564
 565         BUG_ON(in_interrupt());
 566         BUG_ON(irqs_disabled());
 567         mutex_lock(&ide_cfg_mtx);
 568         spin_lock_irq(&ide_lock);
 569         hwif = &ide_hwifs[index];
 570         if (!hwif->present)
 571                 goto abort;
 572         __ide_port_unregister_devices(hwif);
 573         hwif->present = 0;
 574
 575         spin_unlock_irq(&ide_lock);
 576
 577         ide_proc_unregister_port(hwif);
 578
 579         hwgroup = hwif->hwgroup;
 580         /*
 581          * free the irq if we were the only hwif using it
 582          */
 583         g = hwgroup->hwif;
 584         do {
 585                 if (g->irq == hwif->irq)
 586                         ++irq_count;
 587                 g = g->next;
 588         } while (g != hwgroup->hwif);
 589         if (irq_count == 1)
 590                 free_irq(hwif->irq, hwgroup);
 591
 592         ide_remove_port_from_hwgroup(hwif);
 593
 594         device_unregister(&hwif->gendev);
 595         wait_for_completion(&hwif->gendev_rel_comp);
 596
 597         /*
 598          * Remove us from the kernel's knowledge
 599          */
 600         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 601         kfree(hwif->sg_table);
 602         unregister_blkdev(hwif->major, hwif->name);
 603         spin_lock_irq(&ide_lock);
 604
 605         if (hwif->dma_base) {
 606                 (void) ide_release_dma(hwif);
 607
 608                 hwif->dma_base = 0;
 609                 hwif->dma_command = 0;
 610                 hwif->dma_vendor1 = 0;
 611                 hwif->dma_status = 0;
 612                 hwif->dma_vendor3 = 0;
 613                 hwif->dma_prdtable = 0;
 614
 615                 hwif->extra_base  = 0;
 616                 hwif->extra_ports = 0;
 617         }
 618
 619         ide_hwif_release_regions(hwif);
 620
 621         /* copy original settings */
 622         tmp_hwif = *hwif;
 623
 624         /* restore hwif data to pristine status */
 625         ide_init_port_data(hwif, index);
 626
 627         if (init_default)
 628                 init_hwif_default(hwif, index);
 629
 630         if (restore)
 631                 ide_hwif_restore(hwif, &tmp_hwif);
 632
 633 abort:
 634         spin_unlock_irq(&ide_lock);
 635         mutex_unlock(&ide_cfg_mtx);
 636 }
 637
 638 EXPORT_SYMBOL(ide_unregister);
 639
 640 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
 641 {
 642         memcpy(hwif->io_ports, hw->io_ports, sizeof(hwif->io_ports));
 643         hwif->irq = hw->irq;
 644         hwif->noprobe = 0;
 645         hwif->chipset = hw->chipset;
 646         hwif->gendev.parent = hw->dev;
 647         hwif->ack_intr = hw->ack_intr;
 648 }
 649 EXPORT_SYMBOL_GPL(ide_init_port_hw);
 650
 651 /**
 652  *      ide_register_hw         -       register IDE interface
 653  *      @hw: hardware registers
 654  *      @quirkproc: quirkproc function
 655  *      @hwifp: pointer to returned hwif
 656  *
 657  *      Register an IDE interface, specifying exactly the registers etc.
 658  *
 659  *      Returns -1 on error.
 660  */
 661
 662 static int ide_register_hw(hw_regs_t *hw, void (*quirkproc)(ide_drive_t *),
 663                            ide_hwif_t **hwifp)
 664 {
 665         int index, retry = 1;
 666         ide_hwif_t *hwif;
 667         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
 668
 669         do {
 670                 hwif = ide_find_port(hw->io_ports[IDE_DATA_OFFSET]);
 671                 if (hwif)
 672                         goto found;
 673                 for (index = 0; index < MAX_HWIFS; index++)
 674                         ide_unregister(index, 1, 1);
 675         } while (retry--);
 676         return -1;
 677 found:
 678         index = hwif->index;
 679         if (hwif->present)
 680                 ide_unregister(index, 0, 1);
 681         else if (!hwif->hold)
 682                 ide_init_port_data(hwif, index);
 683
 684         ide_init_port_hw(hwif, hw);
 685         hwif->quirkproc = quirkproc;
 686
 687         idx[0] = index;
 688
 689         ide_device_add(idx, NULL);
 690
 691         if (hwifp)
 692                 *hwifp = hwif;
 693
 694         return hwif->present ? index : -1;
 695 }
 696
 697 /*
 698  *      Locks for IDE setting functionality
 699  */
 700
 701 DEFINE_MUTEX(ide_setting_mtx);
 702
 703 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 704
 705 /**
 706  *      ide_spin_wait_hwgroup   -       wait for group
 707  *      @drive: drive in the group
 708  *
 709  *      Wait for an IDE device group to go non busy and then return
 710  *      holding the ide_lock which guards the hwgroup->busy status
 711  *      and right to use it.
 712  */
 713
 714 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 715 {
 716         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 717         unsigned long timeout = jiffies + (3 * HZ);
 718
 719         spin_lock_irq(&ide_lock);
 720
 721         while (hwgroup->busy) {
 722                 unsigned long lflags;
 723                 spin_unlock_irq(&ide_lock);
 724                 local_irq_set(lflags);
 725                 if (time_after(jiffies, timeout)) {
 726                         local_irq_restore(lflags);
 727                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 728                         return -EBUSY;
 729                 }
 730                 local_irq_restore(lflags);
 731                 spin_lock_irq(&ide_lock);
 732         }
 733         return 0;
 734 }
 735
 736 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 737
 738 int set_io_32bit(ide_drive_t *drive, int arg)
 739 {
 740         if (drive->no_io_32bit)
 741                 return -EPERM;
 742
 743         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 744                 return -EINVAL;
 745
 746         if (ide_spin_wait_hwgroup(drive))
 747                 return -EBUSY;
 748
 749         drive->io_32bit = arg;
 750
 751         spin_unlock_irq(&ide_lock);
 752
 753         return 0;
 754 }
 755
 756 static int set_ksettings(ide_drive_t *drive, int arg)
 757 {
 758         if (arg < 0 || arg > 1)
 759                 return -EINVAL;
 760
 761         if (ide_spin_wait_hwgroup(drive))
 762                 return -EBUSY;
 763         drive->keep_settings = arg;
 764         spin_unlock_irq(&ide_lock);
 765
 766         return 0;
 767 }
 768
 769 int set_using_dma(ide_drive_t *drive, int arg)
 770 {
 771 #ifdef CONFIG_BLK_DEV_IDEDMA
 772         ide_hwif_t *hwif = drive->hwif;
 773         int err = -EPERM;
 774
 775         if (arg < 0 || arg > 1)
 776                 return -EINVAL;
 777
 778         if (!drive->id || !(drive->id->capability & 1))
 779                 goto out;
 780
 781         if (hwif->dma_host_set == NULL)
 782                 goto out;
 783
 784         err = -EBUSY;
 785         if (ide_spin_wait_hwgroup(drive))
 786                 goto out;
 787         /*
 788          * set ->busy flag, unlock and let it ride
 789          */
 790         hwif->hwgroup->busy = 1;
 791         spin_unlock_irq(&ide_lock);
 792
 793         err = 0;
 794
 795         if (arg) {
 796                 if (ide_set_dma(drive))
 797                         err = -EIO;
 798         } else
 799                 ide_dma_off(drive);
 800
 801         /*
 802          * lock, clear ->busy flag and unlock before leaving
 803          */
 804         spin_lock_irq(&ide_lock);
 805         hwif->hwgroup->busy = 0;
 806         spin_unlock_irq(&ide_lock);
 807 out:
 808         return err;
 809 #else
 810         if (arg < 0 || arg > 1)
 811                 return -EINVAL;
 812
 813         return -EPERM;
 814 #endif
 815 }
 816
 817 int set_pio_mode(ide_drive_t *drive, int arg)
 818 {
 819         struct request rq;
 820
 821         if (arg < 0 || arg > 255)
 822                 return -EINVAL;
 823
 824         if (drive->hwif->set_pio_mode == NULL)
 825                 return -ENOSYS;
 826
 827         if (drive->special.b.set_tune)
 828                 return -EBUSY;
 829
 830         ide_init_drive_cmd(&rq);
 831         rq.cmd_type = REQ_TYPE_ATA_TASKFILE;
 832
 833         drive->tune_req = (u8) arg;
 834         drive->special.b.set_tune = 1;
 835         (void) ide_do_drive_cmd(drive, &rq, ide_wait);
 836         return 0;
 837 }
 838
 839 static int set_unmaskirq(ide_drive_t *drive, int arg)
 840 {
 841         if (drive->no_unmask)
 842                 return -EPERM;
 843
 844         if (arg < 0 || arg > 1)
 845                 return -EINVAL;
 846
 847         if (ide_spin_wait_hwgroup(drive))
 848                 return -EBUSY;
 849         drive->unmask = arg;
 850         spin_unlock_irq(&ide_lock);
 851
 852         return 0;
 853 }
 854
 855 /**
 856  *      system_bus_clock        -       clock guess
 857  *
 858  *      External version of the bus clock guess used by very old IDE drivers
 859  *      for things like VLB timings. Should not be used.
 860  */
 861
 862 int system_bus_clock (void)
 863 {
 864         return system_bus_speed;
 865 }
 866
 867 EXPORT_SYMBOL(system_bus_clock);
 868
 869 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 870 {
 871         ide_drive_t *drive = dev->driver_data;
 872         ide_hwif_t *hwif = HWIF(drive);
 873         struct request rq;
 874         struct request_pm_state rqpm;
 875         ide_task_t args;
 876         int ret;
 877
 878         /* Call ACPI _GTM only once */
 879         if (!(drive->dn % 2))
 880                 ide_acpi_get_timing(hwif);
 881
 882         memset(&rq, 0, sizeof(rq));
 883         memset(&rqpm, 0, sizeof(rqpm));
 884         memset(&args, 0, sizeof(args));
 885         rq.cmd_type = REQ_TYPE_PM_SUSPEND;
 886         rq.special = &args;
 887         rq.data = &rqpm;
 888         rqpm.pm_step = ide_pm_state_start_suspend;
 889         if (mesg.event == PM_EVENT_PRETHAW)
 890                 mesg.event = PM_EVENT_FREEZE;
 891         rqpm.pm_state = mesg.event;
 892
 893         ret = ide_do_drive_cmd(drive, &rq, ide_wait);
 894         /* only call ACPI _PS3 after both drivers are suspended */
 895         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 896                  && hwif->drives[1].present)
 897                  || !hwif->drives[0].present
 898                  || !hwif->drives[1].present))
 899                 ide_acpi_set_state(hwif, 0);
 900         return ret;
 901 }
 902
 903 static int generic_ide_resume(struct device *dev)
 904 {
 905         ide_drive_t *drive = dev->driver_data;
 906         ide_hwif_t *hwif = HWIF(drive);
 907         struct request rq;
 908         struct request_pm_state rqpm;
 909         ide_task_t args;
 910         int err;
 911
 912         /* Call ACPI _STM only once */
 913         if (!(drive->dn % 2)) {
 914                 ide_acpi_set_state(hwif, 1);
 915                 ide_acpi_push_timing(hwif);
 916         }
 917
 918         ide_acpi_exec_tfs(drive);
 919
 920         memset(&rq, 0, sizeof(rq));
 921         memset(&rqpm, 0, sizeof(rqpm));
 922         memset(&args, 0, sizeof(args));
 923         rq.cmd_type = REQ_TYPE_PM_RESUME;
 924         rq.special = &args;
 925         rq.data = &rqpm;
 926         rqpm.pm_step = ide_pm_state_start_resume;
 927         rqpm.pm_state = PM_EVENT_ON;
 928
 929         err = ide_do_drive_cmd(drive, &rq, ide_head_wait);
 930
 931         if (err == 0 && dev->driver) {
 932                 ide_driver_t *drv = to_ide_driver(dev->driver);
 933
 934                 if (drv->resume)
 935                         drv->resume(drive);
 936         }
 937
 938         return err;
 939 }
 940
 941 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 942                         unsigned int cmd, unsigned long arg)
 943 {
 944         unsigned long flags;
 945         ide_driver_t *drv;
 946         void __user *p = (void __user *)arg;
 947         int err = 0, (*setfunc)(ide_drive_t *, int);
 948         u8 *val;
 949
 950         switch (cmd) {
 951         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
 952         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
 953         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
 954         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
 955         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
 956         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
 957         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
 958         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
 959         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
 960         }
 961
 962         switch (cmd) {
 963                 case HDIO_OBSOLETE_IDENTITY:
 964                 case HDIO_GET_IDENTITY:
 965                         if (bdev != bdev->bd_contains)
 966                                 return -EINVAL;
 967                         if (drive->id_read == 0)
 968                                 return -ENOMSG;
 969                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
 970                                 return -EFAULT;
 971                         return 0;
 972
 973                 case HDIO_GET_NICE:
 974                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
 975                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
 976                                         drive->nice1 << IDE_NICE_1,
 977                                         (long __user *) arg);
 978 #ifdef CONFIG_IDE_TASK_IOCTL
 979                 case HDIO_DRIVE_TASKFILE:
 980                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 981                                 return -EACCES;
 982                         switch(drive->media) {
 983                                 case ide_disk:
 984                                         return ide_taskfile_ioctl(drive, cmd, arg);
 985                                 default:
 986                                         return -ENOMSG;
 987                         }
 988 #endif /* CONFIG_IDE_TASK_IOCTL */
 989
 990                 case HDIO_DRIVE_CMD:
 991                         if (!capable(CAP_SYS_RAWIO))
 992                                 return -EACCES;
 993                         return ide_cmd_ioctl(drive, cmd, arg);
 994
 995                 case HDIO_DRIVE_TASK:
 996                         if (!capable(CAP_SYS_RAWIO))
 997                                 return -EACCES;
 998                         return ide_task_ioctl(drive, cmd, arg);
 999
1000                 case HDIO_SCAN_HWIF:
1001                 {
1002                         hw_regs_t hw;
1003                         int args[3];
1004                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1005                         if (copy_from_user(args, p, 3 * sizeof(int)))
1006                                 return -EFAULT;
1007                         memset(&hw, 0, sizeof(hw));
1008                         ide_init_hwif_ports(&hw, (unsigned long) args[0],
1009                                             (unsigned long) args[1], NULL);
1010                         hw.irq = args[2];
1011                         if (ide_register_hw(&hw, NULL, NULL) == -1)
1012                                 return -EIO;
1013                         return 0;
1014                 }
1015                 case HDIO_UNREGISTER_HWIF:
1016                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1017                         /* (arg > MAX_HWIFS) checked in function */
1018                         ide_unregister(arg, 1, 1);
1019                         return 0;
1020                 case HDIO_SET_NICE:
1021                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1022                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
1023                                 return -EPERM;
1024                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
1025                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
1026                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
1027                                 drive->dsc_overlap = 0;
1028                                 return -EPERM;
1029                         }
1030                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
1031                         return 0;
1032                 case HDIO_DRIVE_RESET:
1033                         if (!capable(CAP_SYS_ADMIN))
1034                                 return -EACCES;
1035
1036                         /*
1037                          *      Abort the current command on the
1038                          *      group if there is one, taking
1039                          *      care not to allow anything else
1040                          *      to be queued and to die on the
1041                          *      spot if we miss one somehow
1042                          */
1043
1044                         spin_lock_irqsave(&ide_lock, flags);
1045
1046                         if (HWGROUP(drive)->resetting) {
1047                                 spin_unlock_irqrestore(&ide_lock, flags);
1048                                 return -EBUSY;
1049                         }
1050
1051                         ide_abort(drive, "drive reset");
1052
1053                         BUG_ON(HWGROUP(drive)->handler);
1054
1055                         /* Ensure nothing gets queued after we
1056                            drop the lock. Reset will clear the busy */
1057
1058                         HWGROUP(drive)->busy = 1;
1059                         spin_unlock_irqrestore(&ide_lock, flags);
1060                         (void) ide_do_reset(drive);
1061
1062                         return 0;
1063                 case HDIO_GET_BUSSTATE:
1064                         if (!capable(CAP_SYS_ADMIN))
1065                                 return -EACCES;
1066                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
1067                                 return -EFAULT;
1068                         return 0;
1069
1070                 case HDIO_SET_BUSSTATE:
1071                         if (!capable(CAP_SYS_ADMIN))
1072                                 return -EACCES;
1073                         return -EOPNOTSUPP;
1074                 default:
1075                         return -EINVAL;
1076         }
1077
1078 read_val:
1079         mutex_lock(&ide_setting_mtx);
1080         spin_lock_irqsave(&ide_lock, flags);
1081         err = *val;
1082         spin_unlock_irqrestore(&ide_lock, flags);
1083         mutex_unlock(&ide_setting_mtx);
1084         return err >= 0 ? put_user(err, (long __user *)arg) : err;
1085
1086 set_val:
1087         if (bdev != bdev->bd_contains)
1088                 err = -EINVAL;
1089         else {
1090                 if (!capable(CAP_SYS_ADMIN))
1091                         err = -EACCES;
1092                 else {
1093                         mutex_lock(&ide_setting_mtx);
1094                         err = setfunc(drive, arg);
1095                         mutex_unlock(&ide_setting_mtx);
1096                 }
1097         }
1098         return err;
1099 }
1100
1101 EXPORT_SYMBOL(generic_ide_ioctl);
1102
1103 /*
1104  * stridx() returns the offset of c within s,
1105  * or -1 if c is '\0' or not found within s.
1106  */
1107 static int __init stridx (const char *s, char c)
1108 {
1109         char *i = strchr(s, c);
1110         return (i && c) ? i - s : -1;
1111 }
1112
1113 /*
1114  * match_parm() does parsing for ide_setup():
1115  *
1116  * 1. the first char of s must be '='.
1117  * 2. if the remainder matches one of the supplied keywords,
1118  *     the index (1 based) of the keyword is negated and returned.
1119  * 3. if the remainder is a series of no more than max_vals numbers
1120  *     separated by commas, the numbers are saved in vals[] and a
1121  *     count of how many were saved is returned.  Base10 is assumed,
1122  *     and base16 is allowed when prefixed with "0x".
1123  * 4. otherwise, zero is returned.
1124  */
1125 static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
1126 {
1127         static const char *decimal = "0123456789";
1128         static const char *hex = "0123456789abcdef";
1129         int i, n;
1130
1131         if (*s++ == '=') {
1132                 /*
1133                  * Try matching against the supplied keywords,
1134                  * and return -(index+1) if we match one
1135                  */
1136                 if (keywords != NULL) {
1137                         for (i = 0; *keywords != NULL; ++i) {
1138                                 if (!strcmp(s, *keywords++))
1139                                         return -(i+1);
1140                         }
1141                 }
1142                 /*
1143                  * Look for a series of no more than "max_vals"
1144                  * numeric values separated by commas, in base10,
1145                  * or base16 when prefixed with "0x".
1146                  * Return a count of how many were found.
1147                  */
1148                 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
1149                         vals[n] = i;
1150                         while ((i = stridx(decimal, *++s)) >= 0)
1151                                 vals[n] = (vals[n] * 10) + i;
1152                         if (*s == 'x' && !vals[n]) {
1153                                 while ((i = stridx(hex, *++s)) >= 0)
1154                                         vals[n] = (vals[n] * 0x10) + i;
1155                         }
1156                         if (++n == max_vals)
1157                                 break;
1158                         if (*s == ',' || *s == ';')
1159                                 ++s;
1160                 }
1161                 if (!*s)
1162                         return n;
1163         }
1164         return 0;       /* zero = nothing matched */
1165 }
1166
1167 extern int probe_ali14xx;
1168 extern int probe_umc8672;
1169 extern int probe_dtc2278;
1170 extern int probe_ht6560b;
1171 extern int probe_qd65xx;
1172 extern int cmd640_vlb;
1173
1174 static int __initdata is_chipset_set[MAX_HWIFS];
1175
1176 /*
1177  * ide_setup() gets called VERY EARLY during initialization,
1178  * to handle kernel "command line" strings beginning with "hdx=" or "ide".
1179  *
1180  * Remember to update Documentation/ide/ide.txt if you change something here.
1181  */
1182 static int __init ide_setup(char *s)
1183 {
1184         int i, vals[3];
1185         ide_hwif_t *hwif;
1186         ide_drive_t *drive;
1187         unsigned int hw, unit;
1188         const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
1189         const char max_hwif  = '0' + (MAX_HWIFS - 1);
1190
1191
1192         if (strncmp(s,"hd",2) == 0 && s[2] == '=')      /* hd= is for hd.c   */
1193                 return 0;                               /* driver and not us */
1194
1195         if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
1196                 return 0;
1197
1198         printk(KERN_INFO "ide_setup: %s", s);
1199         init_ide_data ();
1200
1201 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
1202         if (!strcmp(s, "ide=doubler")) {
1203                 extern int ide_doubler;
1204
1205                 printk(" : Enabled support for IDE doublers\n");
1206                 ide_doubler = 1;
1207                 return 1;
1208         }
1209 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
1210
1211         if (!strcmp(s, "ide=nodma")) {
1212                 printk(" : Prevented DMA\n");
1213                 noautodma = 1;
1214                 goto obsolete_option;
1215         }
1216
1217 #ifdef CONFIG_BLK_DEV_IDEACPI
1218         if (!strcmp(s, "ide=noacpi")) {
1219                 //printk(" : Disable IDE ACPI support.\n");
1220                 ide_noacpi = 1;
1221                 return 1;
1222         }
1223         if (!strcmp(s, "ide=acpigtf")) {
1224                 //printk(" : Enable IDE ACPI _GTF support.\n");
1225                 ide_noacpitfs = 0;
1226                 return 1;
1227         }
1228         if (!strcmp(s, "ide=acpionboot")) {
1229                 //printk(" : Call IDE ACPI methods on boot.\n");
1230                 ide_noacpionboot = 0;
1231                 return 1;
1232         }
1233 #endif /* CONFIG_BLK_DEV_IDEACPI */
1234
1235         /*
1236          * Look for drive options:  "hdx="
1237          */
1238         if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
1239                 const char *hd_words[] = {
1240                         "none", "noprobe", "nowerr", "cdrom", "nodma",
1241                         "autotune", "noautotune", "-8", "-9", "-10",
1242                         "noflush", "remap", "remap63", "scsi", NULL };
1243                 unit = s[2] - 'a';
1244                 hw   = unit / MAX_DRIVES;
1245                 unit = unit % MAX_DRIVES;
1246                 hwif = &ide_hwifs[hw];
1247                 drive = &hwif->drives[unit];
1248                 if (strncmp(s + 4, "ide-", 4) == 0) {
1249                         strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
1250                         goto obsolete_option;
1251                 }
1252                 switch (match_parm(&s[3], hd_words, vals, 3)) {
1253                         case -1: /* "none" */
1254                         case -2: /* "noprobe" */
1255                                 drive->noprobe = 1;
1256                                 goto done;
1257                         case -3: /* "nowerr" */
1258                                 drive->bad_wstat = BAD_R_STAT;
1259                                 hwif->noprobe = 0;
1260                                 goto done;
1261                         case -4: /* "cdrom" */
1262                                 drive->present = 1;
1263                                 drive->media = ide_cdrom;
1264                                 /* an ATAPI device ignores DRDY */
1265                                 drive->ready_stat = 0;
1266                                 hwif->noprobe = 0;
1267                                 goto done;
1268                         case -5: /* nodma */
1269                                 drive->nodma = 1;
1270                                 goto done;
1271                         case -6: /* "autotune" */
1272                                 drive->autotune = IDE_TUNE_AUTO;
1273                                 goto obsolete_option;
1274                         case -7: /* "noautotune" */
1275                                 drive->autotune = IDE_TUNE_NOAUTO;
1276                                 goto obsolete_option;
1277                         case -11: /* noflush */
1278                                 drive->noflush = 1;
1279                                 goto done;
1280                         case -12: /* "remap" */
1281                                 drive->remap_0_to_1 = 1;
1282                                 goto obsolete_option;
1283                         case -13: /* "remap63" */
1284                                 drive->sect0 = 63;
1285                                 goto obsolete_option;
1286                         case -14: /* "scsi" */
1287                                 drive->scsi = 1;
1288                                 goto obsolete_option;
1289                         case 3: /* cyl,head,sect */
1290                                 drive->media    = ide_disk;
1291                                 drive->ready_stat = READY_STAT;
1292                                 drive->cyl      = drive->bios_cyl  = vals[0];
1293                                 drive->head     = drive->bios_head = vals[1];
1294                                 drive->sect     = drive->bios_sect = vals[2];
1295                                 drive->present  = 1;
1296                                 drive->forced_geom = 1;
1297                                 hwif->noprobe = 0;
1298                                 goto done;
1299                         default:
1300                                 goto bad_option;
1301                 }
1302         }
1303
1304         if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
1305                 goto bad_option;
1306         /*
1307          * Look for bus speed option:  "idebus="
1308          */
1309         if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
1310                 if (match_parm(&s[6], NULL, vals, 1) != 1)
1311                         goto bad_option;
1312                 if (vals[0] >= 20 && vals[0] <= 66) {
1313                         idebus_parameter = vals[0];
1314                 } else
1315                         printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
1316                 goto done;
1317         }
1318         /*
1319          * Look for interface options:  "idex="
1320          */
1321         if (s[3] >= '0' && s[3] <= max_hwif) {
1322                 /*
1323                  * Be VERY CAREFUL changing this: note hardcoded indexes below
1324                  * (-8, -9, -10) are reserved to ease the hardcoding.
1325                  */
1326                 static const char *ide_words[] = {
1327                         "noprobe", "serialize", "minus3", "minus4",
1328                         "reset", "minus6", "ata66", "minus8", "minus9",
1329                         "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
1330                         "dtc2278", "umc8672", "ali14xx", NULL };
1331
1332                 hw_regs_t hwregs;
1333
1334                 hw = s[3] - '0';
1335                 hwif = &ide_hwifs[hw];
1336                 i = match_parm(&s[4], ide_words, vals, 3);
1337
1338                 /*
1339                  * Cryptic check to ensure chipset not already set for hwif.
1340                  * Note: we can't depend on hwif->chipset here.
1341                  */
1342                 if ((i >= -18 && i <= -11) || (i > 0 && i <= 3)) {
1343                         /* chipset already specified */
1344                         if (is_chipset_set[hw])
1345                                 goto bad_option;
1346                         if (i > -18 && i <= -11) {
1347                                 /* these drivers are for "ide0=" only */
1348                                 if (hw != 0)
1349                                         goto bad_hwif;
1350                                 /* chipset already specified for 2nd port */
1351                                 if (is_chipset_set[hw+1])
1352                                         goto bad_option;
1353                         }
1354                         is_chipset_set[hw] = 1;
1355                         printk("\n");
1356                 }
1357
1358                 switch (i) {
1359 #ifdef CONFIG_BLK_DEV_ALI14XX
1360                         case -17: /* "ali14xx" */
1361                                 probe_ali14xx = 1;
1362                                 goto obsolete_option;
1363 #endif
1364 #ifdef CONFIG_BLK_DEV_UMC8672
1365                         case -16: /* "umc8672" */
1366                                 probe_umc8672 = 1;
1367                                 goto obsolete_option;
1368 #endif
1369 #ifdef CONFIG_BLK_DEV_DTC2278
1370                         case -15: /* "dtc2278" */
1371                                 probe_dtc2278 = 1;
1372                                 goto obsolete_option;
1373 #endif
1374 #ifdef CONFIG_BLK_DEV_CMD640
1375                         case -14: /* "cmd640_vlb" */
1376                                 cmd640_vlb = 1;
1377                                 goto obsolete_option;
1378 #endif
1379 #ifdef CONFIG_BLK_DEV_HT6560B
1380                         case -13: /* "ht6560b" */
1381                                 probe_ht6560b = 1;
1382                                 goto obsolete_option;
1383 #endif
1384 #ifdef CONFIG_BLK_DEV_QD65XX
1385                         case -12: /* "qd65xx" */
1386                                 probe_qd65xx = 1;
1387                                 goto obsolete_option;
1388 #endif
1389 #ifdef CONFIG_BLK_DEV_4DRIVES
1390                         case -11: /* "four" drives on one set of ports */
1391                         {
1392                                 ide_hwif_t *mate = &ide_hwifs[hw^1];
1393                                 mate->drives[0].select.all ^= 0x20;
1394                                 mate->drives[1].select.all ^= 0x20;
1395                                 hwif->chipset = mate->chipset = ide_4drives;
1396                                 mate->irq = hwif->irq;
1397                                 memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
1398                                 hwif->mate = mate;
1399                                 mate->mate = hwif;
1400                                 hwif->serialized = mate->serialized = 1;
1401                                 goto obsolete_option;
1402                         }
1403 #endif /* CONFIG_BLK_DEV_4DRIVES */
1404                         case -10: /* minus10 */
1405                         case -9: /* minus9 */
1406                         case -8: /* minus8 */
1407                         case -6:
1408                         case -4:
1409                         case -3:
1410                                 goto bad_option;
1411                         case -7: /* ata66 */
1412 #ifdef CONFIG_BLK_DEV_IDEPCI
1413                                 /*
1414                                  * Use ATA_CBL_PATA40_SHORT so drive side
1415                                  * cable detection is also overriden.
1416                                  */
1417                                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1418                                 goto obsolete_option;
1419 #else
1420                                 goto bad_hwif;
1421 #endif
1422                         case -5: /* "reset" */
1423                                 hwif->reset = 1;
1424                                 goto obsolete_option;
1425                         case -2: /* "serialize" */
1426                                 hwif->mate = &ide_hwifs[hw^1];
1427                                 hwif->mate->mate = hwif;
1428                                 hwif->serialized = hwif->mate->serialized = 1;
1429                                 goto obsolete_option;
1430
1431                         case -1: /* "noprobe" */
1432                                 hwif->noprobe = 1;
1433                                 goto obsolete_option;
1434
1435                         case 1: /* base */
1436                                 vals[1] = vals[0] + 0x206; /* default ctl */
1437                         case 2: /* base,ctl */
1438                                 vals[2] = 0;    /* default irq = probe for it */
1439                         case 3: /* base,ctl,irq */
1440                                 memset(&hwregs, 0, sizeof(hwregs));
1441                                 ide_init_hwif_ports(&hwregs, vals[0], vals[1], &hwif->irq);
1442                                 memcpy(hwif->io_ports, hwregs.io_ports, sizeof(hwif->io_ports));
1443                                 hwif->irq      = vals[2];
1444                                 hwif->noprobe  = 0;
1445                                 hwif->chipset  = ide_forced;
1446                                 goto obsolete_option;
1447
1448                         case 0: goto bad_option;
1449                         default:
1450                                 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
1451                                 return 1;
1452                 }
1453         }
1454 bad_option:
1455         printk(" -- BAD OPTION\n");
1456         return 1;
1457 obsolete_option:
1458         printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
1459         return 1;
1460 bad_hwif:
1461         printk("-- NOT SUPPORTED ON ide%d", hw);
1462 done:
1463         printk("\n");
1464         return 1;
1465 }
1466
1467 EXPORT_SYMBOL(ide_lock);
1468
1469 static int ide_bus_match(struct device *dev, struct device_driver *drv)
1470 {
1471         return 1;
1472 }
1473
1474 static char *media_string(ide_drive_t *drive)
1475 {
1476         switch (drive->media) {
1477         case ide_disk:
1478                 return "disk";
1479         case ide_cdrom:
1480                 return "cdrom";
1481         case ide_tape:
1482                 return "tape";
1483         case ide_floppy:
1484                 return "floppy";
1485         case ide_optical:
1486                 return "optical";
1487         default:
1488                 return "UNKNOWN";
1489         }
1490 }
1491
1492 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
1493 {
1494         ide_drive_t *drive = to_ide_device(dev);
1495         return sprintf(buf, "%s\n", media_string(drive));
1496 }
1497
1498 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
1499 {
1500         ide_drive_t *drive = to_ide_device(dev);
1501         return sprintf(buf, "%s\n", drive->name);
1502 }
1503
1504 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1505 {
1506         ide_drive_t *drive = to_ide_device(dev);
1507         return sprintf(buf, "ide:m-%s\n", media_string(drive));
1508 }
1509
1510 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
1511                           char *buf)
1512 {
1513         ide_drive_t *drive = to_ide_device(dev);
1514         return sprintf(buf, "%s\n", drive->id->model);
1515 }
1516
1517 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
1518                              char *buf)
1519 {
1520         ide_drive_t *drive = to_ide_device(dev);
1521         return sprintf(buf, "%s\n", drive->id->fw_rev);
1522 }
1523
1524 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
1525                            char *buf)
1526 {
1527         ide_drive_t *drive = to_ide_device(dev);
1528         return sprintf(buf, "%s\n", drive->id->serial_no);
1529 }
1530
1531 static struct device_attribute ide_dev_attrs[] = {
1532         __ATTR_RO(media),
1533         __ATTR_RO(drivename),
1534         __ATTR_RO(modalias),
1535         __ATTR_RO(model),
1536         __ATTR_RO(firmware),
1537         __ATTR(serial, 0400, serial_show, NULL),
1538         __ATTR_NULL
1539 };
1540
1541 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
1542 {
1543         ide_drive_t *drive = to_ide_device(dev);
1544
1545         add_uevent_var(env, "MEDIA=%s", media_string(drive));
1546         add_uevent_var(env, "DRIVENAME=%s", drive->name);
1547         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
1548         return 0;
1549 }
1550
1551 static int generic_ide_probe(struct device *dev)
1552 {
1553         ide_drive_t *drive = to_ide_device(dev);
1554         ide_driver_t *drv = to_ide_driver(dev->driver);
1555
1556         return drv->probe ? drv->probe(drive) : -ENODEV;
1557 }
1558
1559 static int generic_ide_remove(struct device *dev)
1560 {
1561         ide_drive_t *drive = to_ide_device(dev);
1562         ide_driver_t *drv = to_ide_driver(dev->driver);
1563
1564         if (drv->remove)
1565                 drv->remove(drive);
1566
1567         return 0;
1568 }
1569
1570 static void generic_ide_shutdown(struct device *dev)
1571 {
1572         ide_drive_t *drive = to_ide_device(dev);
1573         ide_driver_t *drv = to_ide_driver(dev->driver);
1574
1575         if (dev->driver && drv->shutdown)
1576                 drv->shutdown(drive);
1577 }
1578
1579 struct bus_type ide_bus_type = {
1580         .name           = "ide",
1581         .match          = ide_bus_match,
1582         .uevent         = ide_uevent,
1583         .probe          = generic_ide_probe,
1584         .remove         = generic_ide_remove,
1585         .shutdown       = generic_ide_shutdown,
1586         .dev_attrs      = ide_dev_attrs,
1587         .suspend        = generic_ide_suspend,
1588         .resume         = generic_ide_resume,
1589 };
1590
1591 EXPORT_SYMBOL_GPL(ide_bus_type);
1592
1593 /*
1594  * This is gets invoked once during initialization, to set *everything* up
1595  */
1596 static int __init ide_init(void)
1597 {
1598         int ret;
1599
1600         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
1601         system_bus_speed = ide_system_bus_speed();
1602
1603         printk(KERN_INFO "ide: Assuming %dMHz system bus speed "
1604                          "for PIO modes%s\n", system_bus_speed,
1605                         idebus_parameter ? "" : "; override with idebus=xx");
1606
1607         ret = bus_register(&ide_bus_type);
1608         if (ret < 0) {
1609                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1610                 return ret;
1611         }
1612
1613         init_ide_data();
1614
1615         proc_ide_create();
1616
1617         return 0;
1618 }
1619
1620 #ifdef MODULE
1621 static char *options = NULL;
1622 module_param(options, charp, 0);
1623 MODULE_LICENSE("GPL");
1624
1625 static void __init parse_options (char *line)
1626 {
1627         char *next = line;
1628
1629         if (line == NULL || !*line)
1630                 return;
1631         while ((line = next) != NULL) {
1632                 if ((next = strchr(line,' ')) != NULL)
1633                         *next++ = 0;
1634                 if (!ide_setup(line))
1635                         printk (KERN_INFO "Unknown option '%s'\n", line);
1636         }
1637 }
1638
1639 int __init init_module (void)
1640 {
1641         parse_options(options);
1642         return ide_init();
1643 }
1644
1645 void __exit cleanup_module (void)
1646 {
1647         int index;
1648
1649         for (index = 0; index < MAX_HWIFS; ++index)
1650                 ide_unregister(index, 0, 0);
1651
1652         proc_ide_destroy();
1653
1654         bus_unregister(&ide_bus_type);
1655 }
1656
1657 #else /* !MODULE */
1658
1659 __setup("", ide_setup);
1660
1661 module_init(ide_init);
1662
1663 #endif /* MODULE */