git.oblomov.eu Git - linux-2.6/blob - 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 REVISION        "Revision: 7.00alpha2"
  48
  49 #define _IDE_C                  /* Tell ide.h it's really us */
  50
  51 #include <linux/module.h>
  52 #include <linux/types.h>
  53 #include <linux/string.h>
  54 #include <linux/kernel.h>
  55 #include <linux/timer.h>
  56 #include <linux/mm.h>
  57 #include <linux/interrupt.h>
  58 #include <linux/major.h>
  59 #include <linux/errno.h>
  60 #include <linux/genhd.h>
  61 #include <linux/blkpg.h>
  62 #include <linux/slab.h>
  63 #include <linux/init.h>
  64 #include <linux/pci.h>
  65 #include <linux/delay.h>
  66 #include <linux/ide.h>
  67 #include <linux/completion.h>
  68 #include <linux/reboot.h>
  69 #include <linux/cdrom.h>
  70 #include <linux/seq_file.h>
  71 #include <linux/device.h>
  72 #include <linux/bitops.h>
  73
  74 #include <asm/byteorder.h>
  75 #include <asm/irq.h>
  76 #include <asm/uaccess.h>
  77 #include <asm/io.h>
  78
  79
  80 /* default maximum number of failures */
  81 #define IDE_DEFAULT_MAX_FAILURES        1
  82
  83 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
  84                                         IDE2_MAJOR, IDE3_MAJOR,
  85                                         IDE4_MAJOR, IDE5_MAJOR,
  86                                         IDE6_MAJOR, IDE7_MAJOR,
  87                                         IDE8_MAJOR, IDE9_MAJOR };
  88
  89 static int idebus_parameter;    /* holds the "idebus=" parameter */
  90 static int system_bus_speed;    /* holds what we think is VESA/PCI bus speed */
  91
  92 DEFINE_MUTEX(ide_cfg_mtx);
  93  __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
  94
  95 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
  96 int ide_scan_direction; /* THIS was formerly 2.2.x pci=reverse */
  97 #endif
  98
  99 int noautodma = 0;
 100
 101 #ifdef CONFIG_BLK_DEV_IDEACPI
 102 int ide_noacpi = 0;
 103 int ide_noacpitfs = 1;
 104 int ide_noacpionboot = 1;
 105 #endif
 106
 107 /*
 108  * This is declared extern in ide.h, for access by other IDE modules:
 109  */
 110 ide_hwif_t ide_hwifs[MAX_HWIFS];        /* master data repository */
 111
 112 EXPORT_SYMBOL(ide_hwifs);
 113
 114 /*
 115  * Do not even *think* about calling this!
 116  */
 117 void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
 118 {
 119         unsigned int unit;
 120
 121         /* bulk initialize hwif & drive info with zeros */
 122         memset(hwif, 0, sizeof(ide_hwif_t));
 123
 124         /* fill in any non-zero initial values */
 125         hwif->index     = index;
 126         hwif->major     = ide_hwif_to_major[index];
 127
 128         hwif->name[0]   = 'i';
 129         hwif->name[1]   = 'd';
 130         hwif->name[2]   = 'e';
 131         hwif->name[3]   = '0' + index;
 132
 133         hwif->bus_state = BUSSTATE_ON;
 134
 135         init_completion(&hwif->gendev_rel_comp);
 136
 137         default_hwif_iops(hwif);
 138         default_hwif_transport(hwif);
 139         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 140                 ide_drive_t *drive = &hwif->drives[unit];
 141
 142                 drive->media                    = ide_disk;
 143                 drive->select.all               = (unit<<4)|0xa0;
 144                 drive->hwif                     = hwif;
 145                 drive->ctl                      = 0x08;
 146                 drive->ready_stat               = READY_STAT;
 147                 drive->bad_wstat                = BAD_W_STAT;
 148                 drive->special.b.recalibrate    = 1;
 149                 drive->special.b.set_geometry   = 1;
 150                 drive->name[0]                  = 'h';
 151                 drive->name[1]                  = 'd';
 152                 drive->name[2]                  = 'a' + (index * MAX_DRIVES) + unit;
 153                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
 154                 drive->using_dma                = 0;
 155                 drive->vdma                     = 0;
 156                 INIT_LIST_HEAD(&drive->list);
 157                 init_completion(&drive->gendev_rel_comp);
 158         }
 159 }
 160 EXPORT_SYMBOL_GPL(ide_init_port_data);
 161
 162 static void init_hwif_default(ide_hwif_t *hwif, unsigned int index)
 163 {
 164         hw_regs_t hw;
 165
 166         memset(&hw, 0, sizeof(hw_regs_t));
 167
 168         ide_init_hwif_ports(&hw, ide_default_io_base(index), 0, &hwif->irq);
 169
 170         memcpy(hwif->io_ports, hw.io_ports, sizeof(hw.io_ports));
 171
 172         hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
 173 #ifdef CONFIG_BLK_DEV_HD
 174         if (hwif->io_ports[IDE_DATA_OFFSET] == HD_DATA)
 175                 hwif->noprobe = 1;      /* may be overridden by ide_setup() */
 176 #endif
 177 }
 178
 179 /*
 180  * init_ide_data() sets reasonable default values into all fields
 181  * of all instances of the hwifs and drives, but only on the first call.
 182  * Subsequent calls have no effect (they don't wipe out anything).
 183  *
 184  * This routine is normally called at driver initialization time,
 185  * but may also be called MUCH earlier during kernel "command-line"
 186  * parameter processing.  As such, we cannot depend on any other parts
 187  * of the kernel (such as memory allocation) to be functioning yet.
 188  *
 189  * This is too bad, as otherwise we could dynamically allocate the
 190  * ide_drive_t structs as needed, rather than always consuming memory
 191  * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
 192  *
 193  * FIXME: We should stuff the setup data into __init and copy the
 194  * relevant hwifs/allocate them properly during boot.
 195  */
 196 #define MAGIC_COOKIE 0x12345678
 197 static void __init init_ide_data (void)
 198 {
 199         ide_hwif_t *hwif;
 200         unsigned int index;
 201         static unsigned long magic_cookie = MAGIC_COOKIE;
 202
 203         if (magic_cookie != MAGIC_COOKIE)
 204                 return;         /* already initialized */
 205         magic_cookie = 0;
 206
 207         /* Initialise all interface structures */
 208         for (index = 0; index < MAX_HWIFS; ++index) {
 209                 hwif = &ide_hwifs[index];
 210                 ide_init_port_data(hwif, index);
 211                 init_hwif_default(hwif, index);
 212 #if !defined(CONFIG_PPC32) || !defined(CONFIG_PCI)
 213                 hwif->irq =
 214                         ide_init_default_irq(hwif->io_ports[IDE_DATA_OFFSET]);
 215 #endif
 216         }
 217 }
 218
 219 /**
 220  *      ide_system_bus_speed    -       guess bus speed
 221  *
 222  *      ide_system_bus_speed() returns what we think is the system VESA/PCI
 223  *      bus speed (in MHz). This is used for calculating interface PIO timings.
 224  *      The default is 40 for known PCI systems, 50 otherwise.
 225  *      The "idebus=xx" parameter can be used to override this value.
 226  *      The actual value to be used is computed/displayed the first time
 227  *      through. Drivers should only use this as a last resort.
 228  *
 229  *      Returns a guessed speed in MHz.
 230  */
 231
 232 static int ide_system_bus_speed(void)
 233 {
 234 #ifdef CONFIG_PCI
 235         static struct pci_device_id pci_default[] = {
 236                 { PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID) },
 237                 { }
 238         };
 239 #else
 240 #define pci_default 0
 241 #endif /* CONFIG_PCI */
 242
 243         /* user supplied value */
 244         if (idebus_parameter)
 245                 return idebus_parameter;
 246
 247         /* safe default value for PCI or VESA and PCI*/
 248         return pci_dev_present(pci_default) ? 33 : 50;
 249 }
 250
 251 ide_hwif_t * ide_find_port(unsigned long base)
 252 {
 253         ide_hwif_t *hwif;
 254         int i;
 255
 256         for (i = 0; i < MAX_HWIFS; i++) {
 257                 hwif = &ide_hwifs[i];
 258                 if (hwif->io_ports[IDE_DATA_OFFSET] == base)
 259                         goto found;
 260         }
 261
 262         for (i = 0; i < MAX_HWIFS; i++) {
 263                 hwif = &ide_hwifs[i];
 264                 if (hwif->io_ports[IDE_DATA_OFFSET] == 0)
 265                         goto found;
 266         }
 267
 268         hwif = NULL;
 269 found:
 270         return hwif;
 271 }
 272
 273 EXPORT_SYMBOL_GPL(ide_find_port);
 274
 275 static struct resource* hwif_request_region(ide_hwif_t *hwif,
 276                                             unsigned long addr, int num)
 277 {
 278         struct resource *res = request_region(addr, num, hwif->name);
 279
 280         if (!res)
 281                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
 282                                 hwif->name, addr, addr+num-1);
 283         return res;
 284 }
 285
 286 /**
 287  *      ide_hwif_request_regions - request resources for IDE
 288  *      @hwif: interface to use
 289  *
 290  *      Requests all the needed resources for an interface.
 291  *      Right now core IDE code does this work which is deeply wrong.
 292  *      MMIO leaves it to the controller driver,
 293  *      PIO will migrate this way over time.
 294  */
 295
 296 int ide_hwif_request_regions(ide_hwif_t *hwif)
 297 {
 298         unsigned long addr;
 299         unsigned int i;
 300
 301         if (hwif->mmio)
 302                 return 0;
 303         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 304         if (addr && !hwif_request_region(hwif, addr, 1))
 305                 goto control_region_busy;
 306         hwif->straight8 = 0;
 307         addr = hwif->io_ports[IDE_DATA_OFFSET];
 308         if ((addr | 7) == hwif->io_ports[IDE_STATUS_OFFSET]) {
 309                 if (!hwif_request_region(hwif, addr, 8))
 310                         goto data_region_busy;
 311                 hwif->straight8 = 1;
 312                 return 0;
 313         }
 314         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
 315                 addr = hwif->io_ports[i];
 316                 if (!hwif_request_region(hwif, addr, 1)) {
 317                         while (--i)
 318                                 release_region(addr, 1);
 319                         goto data_region_busy;
 320                 }
 321         }
 322         return 0;
 323
 324 data_region_busy:
 325         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 326         if (addr)
 327                 release_region(addr, 1);
 328 control_region_busy:
 329         /* If any errors are return, we drop the hwif interface. */
 330         return -EBUSY;
 331 }
 332
 333 /**
 334  *      ide_hwif_release_regions - free IDE resources
 335  *
 336  *      Note that we only release the standard ports,
 337  *      and do not even try to handle any extra ports
 338  *      allocated for weird IDE interface chipsets.
 339  *
 340  *      Note also that we don't yet handle mmio resources here. More
 341  *      importantly our caller should be doing this so we need to
 342  *      restructure this as a helper function for drivers.
 343  */
 344
 345 void ide_hwif_release_regions(ide_hwif_t *hwif)
 346 {
 347         u32 i = 0;
 348
 349         if (hwif->mmio)
 350                 return;
 351         if (hwif->io_ports[IDE_CONTROL_OFFSET])
 352                 release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
 353         if (hwif->straight8) {
 354                 release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
 355                 return;
 356         }
 357         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
 358                 if (hwif->io_ports[i])
 359                         release_region(hwif->io_ports[i], 1);
 360 }
 361
 362 /**
 363  *      ide_hwif_restore        -       restore hwif to template
 364  *      @hwif: hwif to update
 365  *      @tmp_hwif: template
 366  *
 367  *      Restore hwif to a previous state by copying most settings
 368  *      from the template.
 369  */
 370
 371 static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
 372 {
 373         hwif->hwgroup                   = tmp_hwif->hwgroup;
 374
 375         hwif->gendev.parent             = tmp_hwif->gendev.parent;
 376
 377         hwif->proc                      = tmp_hwif->proc;
 378
 379         hwif->major                     = tmp_hwif->major;
 380         hwif->straight8                 = tmp_hwif->straight8;
 381         hwif->bus_state                 = tmp_hwif->bus_state;
 382
 383         hwif->host_flags                = tmp_hwif->host_flags;
 384
 385         hwif->pio_mask                  = tmp_hwif->pio_mask;
 386
 387         hwif->ultra_mask                = tmp_hwif->ultra_mask;
 388         hwif->mwdma_mask                = tmp_hwif->mwdma_mask;
 389         hwif->swdma_mask                = tmp_hwif->swdma_mask;
 390
 391         hwif->cbl                       = tmp_hwif->cbl;
 392
 393         hwif->chipset                   = tmp_hwif->chipset;
 394         hwif->hold                      = tmp_hwif->hold;
 395
 396         hwif->dev                       = tmp_hwif->dev;
 397
 398 #ifdef CONFIG_BLK_DEV_IDEPCI
 399         hwif->cds                       = tmp_hwif->cds;
 400 #endif
 401
 402         hwif->set_pio_mode              = tmp_hwif->set_pio_mode;
 403         hwif->set_dma_mode              = tmp_hwif->set_dma_mode;
 404         hwif->mdma_filter               = tmp_hwif->mdma_filter;
 405         hwif->udma_filter               = tmp_hwif->udma_filter;
 406         hwif->selectproc                = tmp_hwif->selectproc;
 407         hwif->reset_poll                = tmp_hwif->reset_poll;
 408         hwif->pre_reset                 = tmp_hwif->pre_reset;
 409         hwif->resetproc                 = tmp_hwif->resetproc;
 410         hwif->maskproc                  = tmp_hwif->maskproc;
 411         hwif->quirkproc                 = tmp_hwif->quirkproc;
 412         hwif->busproc                   = tmp_hwif->busproc;
 413
 414         hwif->ata_input_data            = tmp_hwif->ata_input_data;
 415         hwif->ata_output_data           = tmp_hwif->ata_output_data;
 416         hwif->atapi_input_bytes         = tmp_hwif->atapi_input_bytes;
 417         hwif->atapi_output_bytes        = tmp_hwif->atapi_output_bytes;
 418
 419         hwif->dma_host_set              = tmp_hwif->dma_host_set;
 420         hwif->dma_setup                 = tmp_hwif->dma_setup;
 421         hwif->dma_exec_cmd              = tmp_hwif->dma_exec_cmd;
 422         hwif->dma_start                 = tmp_hwif->dma_start;
 423         hwif->ide_dma_end               = tmp_hwif->ide_dma_end;
 424         hwif->ide_dma_test_irq          = tmp_hwif->ide_dma_test_irq;
 425         hwif->ide_dma_clear_irq         = tmp_hwif->ide_dma_clear_irq;
 426         hwif->dma_lost_irq              = tmp_hwif->dma_lost_irq;
 427         hwif->dma_timeout               = tmp_hwif->dma_timeout;
 428
 429         hwif->OUTB                      = tmp_hwif->OUTB;
 430         hwif->OUTBSYNC                  = tmp_hwif->OUTBSYNC;
 431         hwif->OUTW                      = tmp_hwif->OUTW;
 432         hwif->OUTSW                     = tmp_hwif->OUTSW;
 433         hwif->OUTSL                     = tmp_hwif->OUTSL;
 434
 435         hwif->INB                       = tmp_hwif->INB;
 436         hwif->INW                       = tmp_hwif->INW;
 437         hwif->INSW                      = tmp_hwif->INSW;
 438         hwif->INSL                      = tmp_hwif->INSL;
 439
 440         hwif->sg_max_nents              = tmp_hwif->sg_max_nents;
 441
 442         hwif->mmio                      = tmp_hwif->mmio;
 443         hwif->rqsize                    = tmp_hwif->rqsize;
 444
 445 #ifndef CONFIG_BLK_DEV_IDECS
 446         hwif->irq                       = tmp_hwif->irq;
 447 #endif
 448
 449         hwif->dma_base                  = tmp_hwif->dma_base;
 450         hwif->dma_command               = tmp_hwif->dma_command;
 451         hwif->dma_vendor1               = tmp_hwif->dma_vendor1;
 452         hwif->dma_status                = tmp_hwif->dma_status;
 453         hwif->dma_vendor3               = tmp_hwif->dma_vendor3;
 454         hwif->dma_prdtable              = tmp_hwif->dma_prdtable;
 455
 456         hwif->config_data               = tmp_hwif->config_data;
 457         hwif->select_data               = tmp_hwif->select_data;
 458         hwif->extra_base                = tmp_hwif->extra_base;
 459         hwif->extra_ports               = tmp_hwif->extra_ports;
 460
 461         hwif->hwif_data                 = tmp_hwif->hwif_data;
 462 }
 463
 464 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
 465 {
 466         ide_hwgroup_t *hwgroup = hwif->hwgroup;
 467
 468         spin_lock_irq(&ide_lock);
 469         /*
 470          * Remove us from the hwgroup, and free
 471          * the hwgroup if we were the only member
 472          */
 473         if (hwif->next == hwif) {
 474                 BUG_ON(hwgroup->hwif != hwif);
 475                 kfree(hwgroup);
 476         } else {
 477                 /* There is another interface in hwgroup.
 478                  * Unlink us, and set hwgroup->drive and ->hwif to
 479                  * something sane.
 480                  */
 481                 ide_hwif_t *g = hwgroup->hwif;
 482
 483                 while (g->next != hwif)
 484                         g = g->next;
 485                 g->next = hwif->next;
 486                 if (hwgroup->hwif == hwif) {
 487                         /* Chose a random hwif for hwgroup->hwif.
 488                          * It's guaranteed that there are no drives
 489                          * left in the hwgroup.
 490                          */
 491                         BUG_ON(hwgroup->drive != NULL);
 492                         hwgroup->hwif = g;
 493                 }
 494                 BUG_ON(hwgroup->hwif == hwif);
 495         }
 496         spin_unlock_irq(&ide_lock);
 497 }
 498
 499 /**
 500  *      ide_unregister          -       free an IDE interface
 501  *      @index: index of interface (will change soon to a pointer)
 502  *      @init_default: init default hwif flag
 503  *      @restore: restore hwif flag
 504  *
 505  *      Perform the final unregister of an IDE interface. At the moment
 506  *      we don't refcount interfaces so this will also get split up.
 507  *
 508  *      Locking:
 509  *      The caller must not hold the IDE locks
 510  *      The drive present/vanishing is not yet properly locked
 511  *      Take care with the callbacks. These have been split to avoid
 512  *      deadlocking the IDE layer. The shutdown callback is called
 513  *      before we take the lock and free resources. It is up to the
 514  *      caller to be sure there is no pending I/O here, and that
 515  *      the interface will not be reopened (present/vanishing locking
 516  *      isn't yet done BTW). After we commit to the final kill we
 517  *      call the cleanup callback with the ide locks held.
 518  *
 519  *      Unregister restores the hwif structures to the default state.
 520  *      This is raving bonkers.
 521  */
 522
 523 void ide_unregister(unsigned int index, int init_default, int restore)
 524 {
 525         ide_drive_t *drive;
 526         ide_hwif_t *hwif, *g;
 527         static ide_hwif_t tmp_hwif; /* protected by ide_cfg_mtx */
 528         ide_hwgroup_t *hwgroup;
 529         int irq_count = 0, unit;
 530
 531         BUG_ON(index >= MAX_HWIFS);
 532
 533         BUG_ON(in_interrupt());
 534         BUG_ON(irqs_disabled());
 535         mutex_lock(&ide_cfg_mtx);
 536         spin_lock_irq(&ide_lock);
 537         hwif = &ide_hwifs[index];
 538         if (!hwif->present)
 539                 goto abort;
 540         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 541                 drive = &hwif->drives[unit];
 542                 if (!drive->present)
 543                         continue;
 544                 spin_unlock_irq(&ide_lock);
 545                 device_unregister(&drive->gendev);
 546                 wait_for_completion(&drive->gendev_rel_comp);
 547                 spin_lock_irq(&ide_lock);
 548         }
 549         hwif->present = 0;
 550
 551         spin_unlock_irq(&ide_lock);
 552
 553         ide_proc_unregister_port(hwif);
 554
 555         hwgroup = hwif->hwgroup;
 556         /*
 557          * free the irq if we were the only hwif using it
 558          */
 559         g = hwgroup->hwif;
 560         do {
 561                 if (g->irq == hwif->irq)
 562                         ++irq_count;
 563                 g = g->next;
 564         } while (g != hwgroup->hwif);
 565         if (irq_count == 1)
 566                 free_irq(hwif->irq, hwgroup);
 567
 568         ide_remove_port_from_hwgroup(hwif);
 569
 570         device_unregister(&hwif->gendev);
 571         wait_for_completion(&hwif->gendev_rel_comp);
 572
 573         /*
 574          * Remove us from the kernel's knowledge
 575          */
 576         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 577         kfree(hwif->sg_table);
 578         unregister_blkdev(hwif->major, hwif->name);
 579         spin_lock_irq(&ide_lock);
 580
 581         if (hwif->dma_base) {
 582                 (void) ide_release_dma(hwif);
 583
 584                 hwif->dma_base = 0;
 585                 hwif->dma_command = 0;
 586                 hwif->dma_vendor1 = 0;
 587                 hwif->dma_status = 0;
 588                 hwif->dma_vendor3 = 0;
 589                 hwif->dma_prdtable = 0;
 590
 591                 hwif->extra_base  = 0;
 592                 hwif->extra_ports = 0;
 593         }
 594
 595         /*
 596          * Note that we only release the standard ports,
 597          * and do not even try to handle any extra ports
 598          * allocated for weird IDE interface chipsets.
 599          */
 600         ide_hwif_release_regions(hwif);
 601
 602         /* copy original settings */
 603         tmp_hwif = *hwif;
 604
 605         /* restore hwif data to pristine status */
 606         ide_init_port_data(hwif, index);
 607
 608         if (init_default)
 609                 init_hwif_default(hwif, index);
 610
 611         if (restore)
 612                 ide_hwif_restore(hwif, &tmp_hwif);
 613
 614 abort:
 615         spin_unlock_irq(&ide_lock);
 616         mutex_unlock(&ide_cfg_mtx);
 617 }
 618
 619 EXPORT_SYMBOL(ide_unregister);
 620
 621 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
 622 {
 623         memcpy(hwif->io_ports, hw->io_ports, sizeof(hwif->io_ports));
 624         hwif->irq = hw->irq;
 625         hwif->noprobe = 0;
 626         hwif->chipset = hw->chipset;
 627         hwif->gendev.parent = hw->dev;
 628         hwif->ack_intr = hw->ack_intr;
 629 }
 630 EXPORT_SYMBOL_GPL(ide_init_port_hw);
 631
 632 ide_hwif_t *ide_deprecated_find_port(unsigned long base)
 633 {
 634         ide_hwif_t *hwif;
 635         int i;
 636
 637         for (i = 0; i < MAX_HWIFS; i++) {
 638                 hwif = &ide_hwifs[i];
 639                 if (hwif->io_ports[IDE_DATA_OFFSET] == base)
 640                         goto found;
 641         }
 642
 643         for (i = 0; i < MAX_HWIFS; i++) {
 644                 hwif = &ide_hwifs[i];
 645                 if (hwif->hold)
 646                         continue;
 647                 if (!hwif->present && hwif->mate == NULL)
 648                         goto found;
 649         }
 650
 651         hwif = NULL;
 652 found:
 653         return hwif;
 654 }
 655 EXPORT_SYMBOL_GPL(ide_deprecated_find_port);
 656
 657 /**
 658  *      ide_register_hw         -       register IDE interface
 659  *      @hw: hardware registers
 660  *      @quirkproc: quirkproc function
 661  *      @hwifp: pointer to returned hwif
 662  *
 663  *      Register an IDE interface, specifying exactly the registers etc.
 664  *
 665  *      Returns -1 on error.
 666  */
 667
 668 int ide_register_hw(hw_regs_t *hw, void (*quirkproc)(ide_drive_t *),
 669                     ide_hwif_t **hwifp)
 670 {
 671         int index, retry = 1;
 672         ide_hwif_t *hwif;
 673         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
 674
 675         do {
 676                 hwif = ide_deprecated_find_port(hw->io_ports[IDE_DATA_OFFSET]);
 677                 index = hwif->index;
 678                 if (hwif)
 679                         goto found;
 680                 for (index = 0; index < MAX_HWIFS; index++)
 681                         ide_unregister(index, 1, 1);
 682         } while (retry--);
 683         return -1;
 684 found:
 685         if (hwif->present)
 686                 ide_unregister(index, 0, 1);
 687         else if (!hwif->hold)
 688                 ide_init_port_data(hwif, index);
 689
 690         ide_init_port_hw(hwif, hw);
 691         hwif->quirkproc = quirkproc;
 692
 693         idx[0] = index;
 694
 695         ide_device_add(idx, NULL);
 696
 697         if (hwifp)
 698                 *hwifp = hwif;
 699
 700         return hwif->present ? index : -1;
 701 }
 702
 703 EXPORT_SYMBOL(ide_register_hw);
 704
 705 /*
 706  *      Locks for IDE setting functionality
 707  */
 708
 709 DEFINE_MUTEX(ide_setting_mtx);
 710
 711 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 712
 713 /**
 714  *      ide_spin_wait_hwgroup   -       wait for group
 715  *      @drive: drive in the group
 716  *
 717  *      Wait for an IDE device group to go non busy and then return
 718  *      holding the ide_lock which guards the hwgroup->busy status
 719  *      and right to use it.
 720  */
 721
 722 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 723 {
 724         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 725         unsigned long timeout = jiffies + (3 * HZ);
 726
 727         spin_lock_irq(&ide_lock);
 728
 729         while (hwgroup->busy) {
 730                 unsigned long lflags;
 731                 spin_unlock_irq(&ide_lock);
 732                 local_irq_set(lflags);
 733                 if (time_after(jiffies, timeout)) {
 734                         local_irq_restore(lflags);
 735                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 736                         return -EBUSY;
 737                 }
 738                 local_irq_restore(lflags);
 739                 spin_lock_irq(&ide_lock);
 740         }
 741         return 0;
 742 }
 743
 744 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 745
 746 int set_io_32bit(ide_drive_t *drive, int arg)
 747 {
 748         if (drive->no_io_32bit)
 749                 return -EPERM;
 750
 751         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 752                 return -EINVAL;
 753
 754         if (ide_spin_wait_hwgroup(drive))
 755                 return -EBUSY;
 756
 757         drive->io_32bit = arg;
 758
 759         spin_unlock_irq(&ide_lock);
 760
 761         return 0;
 762 }
 763
 764 static int set_ksettings(ide_drive_t *drive, int arg)
 765 {
 766         if (arg < 0 || arg > 1)
 767                 return -EINVAL;
 768
 769         if (ide_spin_wait_hwgroup(drive))
 770                 return -EBUSY;
 771         drive->keep_settings = arg;
 772         spin_unlock_irq(&ide_lock);
 773
 774         return 0;
 775 }
 776
 777 int set_using_dma(ide_drive_t *drive, int arg)
 778 {
 779 #ifdef CONFIG_BLK_DEV_IDEDMA
 780         ide_hwif_t *hwif = drive->hwif;
 781         int err = -EPERM;
 782
 783         if (arg < 0 || arg > 1)
 784                 return -EINVAL;
 785
 786         if (!drive->id || !(drive->id->capability & 1))
 787                 goto out;
 788
 789         if (hwif->dma_host_set == NULL)
 790                 goto out;
 791
 792         err = -EBUSY;
 793         if (ide_spin_wait_hwgroup(drive))
 794                 goto out;
 795         /*
 796          * set ->busy flag, unlock and let it ride
 797          */
 798         hwif->hwgroup->busy = 1;
 799         spin_unlock_irq(&ide_lock);
 800
 801         err = 0;
 802
 803         if (arg) {
 804                 if (ide_set_dma(drive))
 805                         err = -EIO;
 806         } else
 807                 ide_dma_off(drive);
 808
 809         /*
 810          * lock, clear ->busy flag and unlock before leaving
 811          */
 812         spin_lock_irq(&ide_lock);
 813         hwif->hwgroup->busy = 0;
 814         spin_unlock_irq(&ide_lock);
 815 out:
 816         return err;
 817 #else
 818         if (arg < 0 || arg > 1)
 819                 return -EINVAL;
 820
 821         return -EPERM;
 822 #endif
 823 }
 824
 825 int set_pio_mode(ide_drive_t *drive, int arg)
 826 {
 827         struct request rq;
 828
 829         if (arg < 0 || arg > 255)
 830                 return -EINVAL;
 831
 832         if (drive->hwif->set_pio_mode == NULL)
 833                 return -ENOSYS;
 834
 835         if (drive->special.b.set_tune)
 836                 return -EBUSY;
 837
 838         ide_init_drive_cmd(&rq);
 839         rq.cmd_type = REQ_TYPE_ATA_TASKFILE;
 840
 841         drive->tune_req = (u8) arg;
 842         drive->special.b.set_tune = 1;
 843         (void) ide_do_drive_cmd(drive, &rq, ide_wait);
 844         return 0;
 845 }
 846
 847 static int set_unmaskirq(ide_drive_t *drive, int arg)
 848 {
 849         if (drive->no_unmask)
 850                 return -EPERM;
 851
 852         if (arg < 0 || arg > 1)
 853                 return -EINVAL;
 854
 855         if (ide_spin_wait_hwgroup(drive))
 856                 return -EBUSY;
 857         drive->unmask = arg;
 858         spin_unlock_irq(&ide_lock);
 859
 860         return 0;
 861 }
 862
 863 /**
 864  *      system_bus_clock        -       clock guess
 865  *
 866  *      External version of the bus clock guess used by very old IDE drivers
 867  *      for things like VLB timings. Should not be used.
 868  */
 869
 870 int system_bus_clock (void)
 871 {
 872         return system_bus_speed;
 873 }
 874
 875 EXPORT_SYMBOL(system_bus_clock);
 876
 877 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 878 {
 879         ide_drive_t *drive = dev->driver_data;
 880         ide_hwif_t *hwif = HWIF(drive);
 881         struct request rq;
 882         struct request_pm_state rqpm;
 883         ide_task_t args;
 884         int ret;
 885
 886         /* Call ACPI _GTM only once */
 887         if (!(drive->dn % 2))
 888                 ide_acpi_get_timing(hwif);
 889
 890         memset(&rq, 0, sizeof(rq));
 891         memset(&rqpm, 0, sizeof(rqpm));
 892         memset(&args, 0, sizeof(args));
 893         rq.cmd_type = REQ_TYPE_PM_SUSPEND;
 894         rq.special = &args;
 895         rq.data = &rqpm;
 896         rqpm.pm_step = ide_pm_state_start_suspend;
 897         if (mesg.event == PM_EVENT_PRETHAW)
 898                 mesg.event = PM_EVENT_FREEZE;
 899         rqpm.pm_state = mesg.event;
 900
 901         ret = ide_do_drive_cmd(drive, &rq, ide_wait);
 902         /* only call ACPI _PS3 after both drivers are suspended */
 903         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 904                  && hwif->drives[1].present)
 905                  || !hwif->drives[0].present
 906                  || !hwif->drives[1].present))
 907                 ide_acpi_set_state(hwif, 0);
 908         return ret;
 909 }
 910
 911 static int generic_ide_resume(struct device *dev)
 912 {
 913         ide_drive_t *drive = dev->driver_data;
 914         ide_hwif_t *hwif = HWIF(drive);
 915         struct request rq;
 916         struct request_pm_state rqpm;
 917         ide_task_t args;
 918         int err;
 919
 920         /* Call ACPI _STM only once */
 921         if (!(drive->dn % 2)) {
 922                 ide_acpi_set_state(hwif, 1);
 923                 ide_acpi_push_timing(hwif);
 924         }
 925
 926         ide_acpi_exec_tfs(drive);
 927
 928         memset(&rq, 0, sizeof(rq));
 929         memset(&rqpm, 0, sizeof(rqpm));
 930         memset(&args, 0, sizeof(args));
 931         rq.cmd_type = REQ_TYPE_PM_RESUME;
 932         rq.special = &args;
 933         rq.data = &rqpm;
 934         rqpm.pm_step = ide_pm_state_start_resume;
 935         rqpm.pm_state = PM_EVENT_ON;
 936
 937         err = ide_do_drive_cmd(drive, &rq, ide_head_wait);
 938
 939         if (err == 0 && dev->driver) {
 940                 ide_driver_t *drv = to_ide_driver(dev->driver);
 941
 942                 if (drv->resume)
 943                         drv->resume(drive);
 944         }
 945
 946         return err;
 947 }
 948
 949 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 950                         unsigned int cmd, unsigned long arg)
 951 {
 952         unsigned long flags;
 953         ide_driver_t *drv;
 954         void __user *p = (void __user *)arg;
 955         int err = 0, (*setfunc)(ide_drive_t *, int);
 956         u8 *val;
 957
 958         switch (cmd) {
 959         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
 960         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
 961         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
 962         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
 963         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
 964         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
 965         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
 966         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
 967         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
 968         }
 969
 970         switch (cmd) {
 971                 case HDIO_OBSOLETE_IDENTITY:
 972                 case HDIO_GET_IDENTITY:
 973                         if (bdev != bdev->bd_contains)
 974                                 return -EINVAL;
 975                         if (drive->id_read == 0)
 976                                 return -ENOMSG;
 977                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
 978                                 return -EFAULT;
 979                         return 0;
 980
 981                 case HDIO_GET_NICE:
 982                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
 983                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
 984                                         drive->nice1 << IDE_NICE_1,
 985                                         (long __user *) arg);
 986 #ifdef CONFIG_IDE_TASK_IOCTL
 987                 case HDIO_DRIVE_TASKFILE:
 988                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 989                                 return -EACCES;
 990                         switch(drive->media) {
 991                                 case ide_disk:
 992                                         return ide_taskfile_ioctl(drive, cmd, arg);
 993                                 default:
 994                                         return -ENOMSG;
 995                         }
 996 #endif /* CONFIG_IDE_TASK_IOCTL */
 997
 998                 case HDIO_DRIVE_CMD:
 999                         if (!capable(CAP_SYS_RAWIO))
1000                                 return -EACCES;
1001                         return ide_cmd_ioctl(drive, cmd, arg);
1002
1003                 case HDIO_DRIVE_TASK:
1004                         if (!capable(CAP_SYS_RAWIO))
1005                                 return -EACCES;
1006                         return ide_task_ioctl(drive, cmd, arg);
1007
1008                 case HDIO_SCAN_HWIF:
1009                 {
1010                         hw_regs_t hw;
1011                         int args[3];
1012                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1013                         if (copy_from_user(args, p, 3 * sizeof(int)))
1014                                 return -EFAULT;
1015                         memset(&hw, 0, sizeof(hw));
1016                         ide_init_hwif_ports(&hw, (unsigned long) args[0],
1017                                             (unsigned long) args[1], NULL);
1018                         hw.irq = args[2];
1019                         if (ide_register_hw(&hw, NULL, NULL) == -1)
1020                                 return -EIO;
1021                         return 0;
1022                 }
1023                 case HDIO_UNREGISTER_HWIF:
1024                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1025                         /* (arg > MAX_HWIFS) checked in function */
1026                         ide_unregister(arg, 1, 1);
1027                         return 0;
1028                 case HDIO_SET_NICE:
1029                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1030                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
1031                                 return -EPERM;
1032                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
1033                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
1034                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
1035                                 drive->dsc_overlap = 0;
1036                                 return -EPERM;
1037                         }
1038                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
1039                         return 0;
1040                 case HDIO_DRIVE_RESET:
1041                 {
1042                         unsigned long flags;
1043                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1044
1045                         /*
1046                          *      Abort the current command on the
1047                          *      group if there is one, taking
1048                          *      care not to allow anything else
1049                          *      to be queued and to die on the
1050                          *      spot if we miss one somehow
1051                          */
1052
1053                         spin_lock_irqsave(&ide_lock, flags);
1054
1055                         if (HWGROUP(drive)->resetting) {
1056                                 spin_unlock_irqrestore(&ide_lock, flags);
1057                                 return -EBUSY;
1058                         }
1059
1060                         ide_abort(drive, "drive reset");
1061
1062                         BUG_ON(HWGROUP(drive)->handler);
1063
1064                         /* Ensure nothing gets queued after we
1065                            drop the lock. Reset will clear the busy */
1066
1067                         HWGROUP(drive)->busy = 1;
1068                         spin_unlock_irqrestore(&ide_lock, flags);
1069                         (void) ide_do_reset(drive);
1070
1071                         return 0;
1072                 }
1073
1074                 case HDIO_GET_BUSSTATE:
1075                         if (!capable(CAP_SYS_ADMIN))
1076                                 return -EACCES;
1077                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
1078                                 return -EFAULT;
1079                         return 0;
1080
1081                 case HDIO_SET_BUSSTATE:
1082                         if (!capable(CAP_SYS_ADMIN))
1083                                 return -EACCES;
1084                         if (HWIF(drive)->busproc)
1085                                 return HWIF(drive)->busproc(drive, (int)arg);
1086                         return -EOPNOTSUPP;
1087                 default:
1088                         return -EINVAL;
1089         }
1090
1091 read_val:
1092         mutex_lock(&ide_setting_mtx);
1093         spin_lock_irqsave(&ide_lock, flags);
1094         err = *val;
1095         spin_unlock_irqrestore(&ide_lock, flags);
1096         mutex_unlock(&ide_setting_mtx);
1097         return err >= 0 ? put_user(err, (long __user *)arg) : err;
1098
1099 set_val:
1100         if (bdev != bdev->bd_contains)
1101                 err = -EINVAL;
1102         else {
1103                 if (!capable(CAP_SYS_ADMIN))
1104                         err = -EACCES;
1105                 else {
1106                         mutex_lock(&ide_setting_mtx);
1107                         err = setfunc(drive, arg);
1108                         mutex_unlock(&ide_setting_mtx);
1109                 }
1110         }
1111         return err;
1112 }
1113
1114 EXPORT_SYMBOL(generic_ide_ioctl);
1115
1116 /*
1117  * stridx() returns the offset of c within s,
1118  * or -1 if c is '\0' or not found within s.
1119  */
1120 static int __init stridx (const char *s, char c)
1121 {
1122         char *i = strchr(s, c);
1123         return (i && c) ? i - s : -1;
1124 }
1125
1126 /*
1127  * match_parm() does parsing for ide_setup():
1128  *
1129  * 1. the first char of s must be '='.
1130  * 2. if the remainder matches one of the supplied keywords,
1131  *     the index (1 based) of the keyword is negated and returned.
1132  * 3. if the remainder is a series of no more than max_vals numbers
1133  *     separated by commas, the numbers are saved in vals[] and a
1134  *     count of how many were saved is returned.  Base10 is assumed,
1135  *     and base16 is allowed when prefixed with "0x".
1136  * 4. otherwise, zero is returned.
1137  */
1138 static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
1139 {
1140         static const char *decimal = "0123456789";
1141         static const char *hex = "0123456789abcdef";
1142         int i, n;
1143
1144         if (*s++ == '=') {
1145                 /*
1146                  * Try matching against the supplied keywords,
1147                  * and return -(index+1) if we match one
1148                  */
1149                 if (keywords != NULL) {
1150                         for (i = 0; *keywords != NULL; ++i) {
1151                                 if (!strcmp(s, *keywords++))
1152                                         return -(i+1);
1153                         }
1154                 }
1155                 /*
1156                  * Look for a series of no more than "max_vals"
1157                  * numeric values separated by commas, in base10,
1158                  * or base16 when prefixed with "0x".
1159                  * Return a count of how many were found.
1160                  */
1161                 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
1162                         vals[n] = i;
1163                         while ((i = stridx(decimal, *++s)) >= 0)
1164                                 vals[n] = (vals[n] * 10) + i;
1165                         if (*s == 'x' && !vals[n]) {
1166                                 while ((i = stridx(hex, *++s)) >= 0)
1167                                         vals[n] = (vals[n] * 0x10) + i;
1168                         }
1169                         if (++n == max_vals)
1170                                 break;
1171                         if (*s == ',' || *s == ';')
1172                                 ++s;
1173                 }
1174                 if (!*s)
1175                         return n;
1176         }
1177         return 0;       /* zero = nothing matched */
1178 }
1179
1180 extern int probe_ali14xx;
1181 extern int probe_umc8672;
1182 extern int probe_dtc2278;
1183 extern int probe_ht6560b;
1184 extern int probe_qd65xx;
1185 extern int cmd640_vlb;
1186
1187 static int __initdata is_chipset_set[MAX_HWIFS];
1188
1189 /*
1190  * ide_setup() gets called VERY EARLY during initialization,
1191  * to handle kernel "command line" strings beginning with "hdx=" or "ide".
1192  *
1193  * Remember to update Documentation/ide.txt if you change something here.
1194  */
1195 static int __init ide_setup(char *s)
1196 {
1197         int i, vals[3];
1198         ide_hwif_t *hwif;
1199         ide_drive_t *drive;
1200         unsigned int hw, unit;
1201         const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
1202         const char max_hwif  = '0' + (MAX_HWIFS - 1);
1203
1204
1205         if (strncmp(s,"hd",2) == 0 && s[2] == '=')      /* hd= is for hd.c   */
1206                 return 0;                               /* driver and not us */
1207
1208         if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
1209                 return 0;
1210
1211         printk(KERN_INFO "ide_setup: %s", s);
1212         init_ide_data ();
1213
1214 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
1215         if (!strcmp(s, "ide=doubler")) {
1216                 extern int ide_doubler;
1217
1218                 printk(" : Enabled support for IDE doublers\n");
1219                 ide_doubler = 1;
1220                 return 1;
1221         }
1222 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
1223
1224         if (!strcmp(s, "ide=nodma")) {
1225                 printk(" : Prevented DMA\n");
1226                 noautodma = 1;
1227                 goto obsolete_option;
1228         }
1229
1230 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
1231         if (!strcmp(s, "ide=reverse")) {
1232                 ide_scan_direction = 1;
1233                 printk(" : Enabled support for IDE inverse scan order.\n");
1234                 return 1;
1235         }
1236 #endif
1237
1238 #ifdef CONFIG_BLK_DEV_IDEACPI
1239         if (!strcmp(s, "ide=noacpi")) {
1240                 //printk(" : Disable IDE ACPI support.\n");
1241                 ide_noacpi = 1;
1242                 return 1;
1243         }
1244         if (!strcmp(s, "ide=acpigtf")) {
1245                 //printk(" : Enable IDE ACPI _GTF support.\n");
1246                 ide_noacpitfs = 0;
1247                 return 1;
1248         }
1249         if (!strcmp(s, "ide=acpionboot")) {
1250                 //printk(" : Call IDE ACPI methods on boot.\n");
1251                 ide_noacpionboot = 0;
1252                 return 1;
1253         }
1254 #endif /* CONFIG_BLK_DEV_IDEACPI */
1255
1256         /*
1257          * Look for drive options:  "hdx="
1258          */
1259         if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
1260                 const char *hd_words[] = {
1261                         "none", "noprobe", "nowerr", "cdrom", "nodma",
1262                         "autotune", "noautotune", "-8", "-9", "-10",
1263                         "noflush", "remap", "remap63", "scsi", NULL };
1264                 unit = s[2] - 'a';
1265                 hw   = unit / MAX_DRIVES;
1266                 unit = unit % MAX_DRIVES;
1267                 hwif = &ide_hwifs[hw];
1268                 drive = &hwif->drives[unit];
1269                 if (strncmp(s + 4, "ide-", 4) == 0) {
1270                         strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
1271                         goto done;
1272                 }
1273                 switch (match_parm(&s[3], hd_words, vals, 3)) {
1274                         case -1: /* "none" */
1275                         case -2: /* "noprobe" */
1276                                 drive->noprobe = 1;
1277                                 goto done;
1278                         case -3: /* "nowerr" */
1279                                 drive->bad_wstat = BAD_R_STAT;
1280                                 hwif->noprobe = 0;
1281                                 goto done;
1282                         case -4: /* "cdrom" */
1283                                 drive->present = 1;
1284                                 drive->media = ide_cdrom;
1285                                 /* an ATAPI device ignores DRDY */
1286                                 drive->ready_stat = 0;
1287                                 hwif->noprobe = 0;
1288                                 goto done;
1289                         case -5: /* nodma */
1290                                 drive->nodma = 1;
1291                                 goto done;
1292                         case -6: /* "autotune" */
1293                                 drive->autotune = IDE_TUNE_AUTO;
1294                                 goto obsolete_option;
1295                         case -7: /* "noautotune" */
1296                                 drive->autotune = IDE_TUNE_NOAUTO;
1297                                 goto obsolete_option;
1298                         case -11: /* noflush */
1299                                 drive->noflush = 1;
1300                                 goto done;
1301                         case -12: /* "remap" */
1302                                 drive->remap_0_to_1 = 1;
1303                                 goto done;
1304                         case -13: /* "remap63" */
1305                                 drive->sect0 = 63;
1306                                 goto done;
1307                         case -14: /* "scsi" */
1308                                 drive->scsi = 1;
1309                                 goto done;
1310                         case 3: /* cyl,head,sect */
1311                                 drive->media    = ide_disk;
1312                                 drive->ready_stat = READY_STAT;
1313                                 drive->cyl      = drive->bios_cyl  = vals[0];
1314                                 drive->head     = drive->bios_head = vals[1];
1315                                 drive->sect     = drive->bios_sect = vals[2];
1316                                 drive->present  = 1;
1317                                 drive->forced_geom = 1;
1318                                 hwif->noprobe = 0;
1319                                 goto done;
1320                         default:
1321                                 goto bad_option;
1322                 }
1323         }
1324
1325         if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
1326                 goto bad_option;
1327         /*
1328          * Look for bus speed option:  "idebus="
1329          */
1330         if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
1331                 if (match_parm(&s[6], NULL, vals, 1) != 1)
1332                         goto bad_option;
1333                 if (vals[0] >= 20 && vals[0] <= 66) {
1334                         idebus_parameter = vals[0];
1335                 } else
1336                         printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
1337                 goto done;
1338         }
1339         /*
1340          * Look for interface options:  "idex="
1341          */
1342         if (s[3] >= '0' && s[3] <= max_hwif) {
1343                 /*
1344                  * Be VERY CAREFUL changing this: note hardcoded indexes below
1345                  * (-8, -9, -10) are reserved to ease the hardcoding.
1346                  */
1347                 static const char *ide_words[] = {
1348                         "noprobe", "serialize", "minus3", "minus4",
1349                         "reset", "minus6", "ata66", "minus8", "minus9",
1350                         "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
1351                         "dtc2278", "umc8672", "ali14xx", NULL };
1352
1353                 hw_regs_t hwregs;
1354
1355                 hw = s[3] - '0';
1356                 hwif = &ide_hwifs[hw];
1357                 i = match_parm(&s[4], ide_words, vals, 3);
1358
1359                 /*
1360                  * Cryptic check to ensure chipset not already set for hwif.
1361                  * Note: we can't depend on hwif->chipset here.
1362                  */
1363                 if ((i >= -18 && i <= -11) || (i > 0 && i <= 3)) {
1364                         /* chipset already specified */
1365                         if (is_chipset_set[hw])
1366                                 goto bad_option;
1367                         if (i > -18 && i <= -11) {
1368                                 /* these drivers are for "ide0=" only */
1369                                 if (hw != 0)
1370                                         goto bad_hwif;
1371                                 /* chipset already specified for 2nd port */
1372                                 if (is_chipset_set[hw+1])
1373                                         goto bad_option;
1374                         }
1375                         is_chipset_set[hw] = 1;
1376                         printk("\n");
1377                 }
1378
1379                 switch (i) {
1380 #ifdef CONFIG_BLK_DEV_ALI14XX
1381                         case -17: /* "ali14xx" */
1382                                 probe_ali14xx = 1;
1383                                 goto done;
1384 #endif
1385 #ifdef CONFIG_BLK_DEV_UMC8672
1386                         case -16: /* "umc8672" */
1387                                 probe_umc8672 = 1;
1388                                 goto done;
1389 #endif
1390 #ifdef CONFIG_BLK_DEV_DTC2278
1391                         case -15: /* "dtc2278" */
1392                                 probe_dtc2278 = 1;
1393                                 goto done;
1394 #endif
1395 #ifdef CONFIG_BLK_DEV_CMD640
1396                         case -14: /* "cmd640_vlb" */
1397                                 cmd640_vlb = 1;
1398                                 goto done;
1399 #endif
1400 #ifdef CONFIG_BLK_DEV_HT6560B
1401                         case -13: /* "ht6560b" */
1402                                 probe_ht6560b = 1;
1403                                 goto done;
1404 #endif
1405 #ifdef CONFIG_BLK_DEV_QD65XX
1406                         case -12: /* "qd65xx" */
1407                                 probe_qd65xx = 1;
1408                                 goto done;
1409 #endif
1410 #ifdef CONFIG_BLK_DEV_4DRIVES
1411                         case -11: /* "four" drives on one set of ports */
1412                         {
1413                                 ide_hwif_t *mate = &ide_hwifs[hw^1];
1414                                 mate->drives[0].select.all ^= 0x20;
1415                                 mate->drives[1].select.all ^= 0x20;
1416                                 hwif->chipset = mate->chipset = ide_4drives;
1417                                 mate->irq = hwif->irq;
1418                                 memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
1419                                 hwif->mate = mate;
1420                                 mate->mate = hwif;
1421                                 hwif->serialized = mate->serialized = 1;
1422                                 goto obsolete_option;
1423                         }
1424 #endif /* CONFIG_BLK_DEV_4DRIVES */
1425                         case -10: /* minus10 */
1426                         case -9: /* minus9 */
1427                         case -8: /* minus8 */
1428                         case -6:
1429                         case -4:
1430                         case -3:
1431                                 goto bad_option;
1432                         case -7: /* ata66 */
1433 #ifdef CONFIG_BLK_DEV_IDEPCI
1434                                 /*
1435                                  * Use ATA_CBL_PATA40_SHORT so drive side
1436                                  * cable detection is also overriden.
1437                                  */
1438                                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1439                                 goto obsolete_option;
1440 #else
1441                                 goto bad_hwif;
1442 #endif
1443                         case -5: /* "reset" */
1444                                 hwif->reset = 1;
1445                                 goto obsolete_option;
1446                         case -2: /* "serialize" */
1447                                 hwif->mate = &ide_hwifs[hw^1];
1448                                 hwif->mate->mate = hwif;
1449                                 hwif->serialized = hwif->mate->serialized = 1;
1450                                 goto obsolete_option;
1451
1452                         case -1: /* "noprobe" */
1453                                 hwif->noprobe = 1;
1454                                 goto done;
1455
1456                         case 1: /* base */
1457                                 vals[1] = vals[0] + 0x206; /* default ctl */
1458                         case 2: /* base,ctl */
1459                                 vals[2] = 0;    /* default irq = probe for it */
1460                         case 3: /* base,ctl,irq */
1461                                 memset(&hwregs, 0, sizeof(hwregs));
1462                                 ide_init_hwif_ports(&hwregs, vals[0], vals[1], &hwif->irq);
1463                                 memcpy(hwif->io_ports, hwregs.io_ports, sizeof(hwif->io_ports));
1464                                 hwif->irq      = vals[2];
1465                                 hwif->noprobe  = 0;
1466                                 hwif->chipset  = ide_forced;
1467                                 goto obsolete_option;
1468
1469                         case 0: goto bad_option;
1470                         default:
1471                                 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
1472                                 return 1;
1473                 }
1474         }
1475 bad_option:
1476         printk(" -- BAD OPTION\n");
1477         return 1;
1478 obsolete_option:
1479         printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
1480         return 1;
1481 bad_hwif:
1482         printk("-- NOT SUPPORTED ON ide%d", hw);
1483 done:
1484         printk("\n");
1485         return 1;
1486 }
1487
1488 EXPORT_SYMBOL(ide_lock);
1489
1490 static int ide_bus_match(struct device *dev, struct device_driver *drv)
1491 {
1492         return 1;
1493 }
1494
1495 static char *media_string(ide_drive_t *drive)
1496 {
1497         switch (drive->media) {
1498         case ide_disk:
1499                 return "disk";
1500         case ide_cdrom:
1501                 return "cdrom";
1502         case ide_tape:
1503                 return "tape";
1504         case ide_floppy:
1505                 return "floppy";
1506         case ide_optical:
1507                 return "optical";
1508         default:
1509                 return "UNKNOWN";
1510         }
1511 }
1512
1513 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
1514 {
1515         ide_drive_t *drive = to_ide_device(dev);
1516         return sprintf(buf, "%s\n", media_string(drive));
1517 }
1518
1519 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
1520 {
1521         ide_drive_t *drive = to_ide_device(dev);
1522         return sprintf(buf, "%s\n", drive->name);
1523 }
1524
1525 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1526 {
1527         ide_drive_t *drive = to_ide_device(dev);
1528         return sprintf(buf, "ide:m-%s\n", media_string(drive));
1529 }
1530
1531 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
1532                           char *buf)
1533 {
1534         ide_drive_t *drive = to_ide_device(dev);
1535         return sprintf(buf, "%s\n", drive->id->model);
1536 }
1537
1538 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
1539                              char *buf)
1540 {
1541         ide_drive_t *drive = to_ide_device(dev);
1542         return sprintf(buf, "%s\n", drive->id->fw_rev);
1543 }
1544
1545 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
1546                            char *buf)
1547 {
1548         ide_drive_t *drive = to_ide_device(dev);
1549         return sprintf(buf, "%s\n", drive->id->serial_no);
1550 }
1551
1552 static struct device_attribute ide_dev_attrs[] = {
1553         __ATTR_RO(media),
1554         __ATTR_RO(drivename),
1555         __ATTR_RO(modalias),
1556         __ATTR_RO(model),
1557         __ATTR_RO(firmware),
1558         __ATTR(serial, 0400, serial_show, NULL),
1559         __ATTR_NULL
1560 };
1561
1562 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
1563 {
1564         ide_drive_t *drive = to_ide_device(dev);
1565
1566         add_uevent_var(env, "MEDIA=%s", media_string(drive));
1567         add_uevent_var(env, "DRIVENAME=%s", drive->name);
1568         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
1569         return 0;
1570 }
1571
1572 static int generic_ide_probe(struct device *dev)
1573 {
1574         ide_drive_t *drive = to_ide_device(dev);
1575         ide_driver_t *drv = to_ide_driver(dev->driver);
1576
1577         return drv->probe ? drv->probe(drive) : -ENODEV;
1578 }
1579
1580 static int generic_ide_remove(struct device *dev)
1581 {
1582         ide_drive_t *drive = to_ide_device(dev);
1583         ide_driver_t *drv = to_ide_driver(dev->driver);
1584
1585         if (drv->remove)
1586                 drv->remove(drive);
1587
1588         return 0;
1589 }
1590
1591 static void generic_ide_shutdown(struct device *dev)
1592 {
1593         ide_drive_t *drive = to_ide_device(dev);
1594         ide_driver_t *drv = to_ide_driver(dev->driver);
1595
1596         if (dev->driver && drv->shutdown)
1597                 drv->shutdown(drive);
1598 }
1599
1600 struct bus_type ide_bus_type = {
1601         .name           = "ide",
1602         .match          = ide_bus_match,
1603         .uevent         = ide_uevent,
1604         .probe          = generic_ide_probe,
1605         .remove         = generic_ide_remove,
1606         .shutdown       = generic_ide_shutdown,
1607         .dev_attrs      = ide_dev_attrs,
1608         .suspend        = generic_ide_suspend,
1609         .resume         = generic_ide_resume,
1610 };
1611
1612 EXPORT_SYMBOL_GPL(ide_bus_type);
1613
1614 /*
1615  * This is gets invoked once during initialization, to set *everything* up
1616  */
1617 static int __init ide_init(void)
1618 {
1619         int ret;
1620
1621         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver " REVISION "\n");
1622         system_bus_speed = ide_system_bus_speed();
1623
1624         printk(KERN_INFO "ide: Assuming %dMHz system bus speed "
1625                          "for PIO modes%s\n", system_bus_speed,
1626                         idebus_parameter ? "" : "; override with idebus=xx");
1627
1628         ret = bus_register(&ide_bus_type);
1629         if (ret < 0) {
1630                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1631                 return ret;
1632         }
1633
1634         init_ide_data();
1635
1636         proc_ide_create();
1637
1638         return 0;
1639 }
1640
1641 #ifdef MODULE
1642 static char *options = NULL;
1643 module_param(options, charp, 0);
1644 MODULE_LICENSE("GPL");
1645
1646 static void __init parse_options (char *line)
1647 {
1648         char *next = line;
1649
1650         if (line == NULL || !*line)
1651                 return;
1652         while ((line = next) != NULL) {
1653                 if ((next = strchr(line,' ')) != NULL)
1654                         *next++ = 0;
1655                 if (!ide_setup(line))
1656                         printk (KERN_INFO "Unknown option '%s'\n", line);
1657         }
1658 }
1659
1660 int __init init_module (void)
1661 {
1662         parse_options(options);
1663         return ide_init();
1664 }
1665
1666 void __exit cleanup_module (void)
1667 {
1668         int index;
1669
1670         for (index = 0; index < MAX_HWIFS; ++index)
1671                 ide_unregister(index, 0, 0);
1672
1673         proc_ide_destroy();
1674
1675         bus_unregister(&ide_bus_type);
1676 }
1677
1678 #else /* !MODULE */
1679
1680 __setup("", ide_setup);
1681
1682 module_init(ide_init);
1683
1684 #endif /* MODULE */