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