err.no 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 #ifdef CONFIG_BLK_DEV_HD
 181         if (hwif->io_ports[IDE_DATA_OFFSET] == HD_DATA)
 182                 hwif->noprobe = 1;      /* may be overridden by ide_setup() */
 183 #endif
 184 }
 185
 186 /*
 187  * init_ide_data() sets reasonable default values into all fields
 188  * of all instances of the hwifs and drives, but only on the first call.
 189  * Subsequent calls have no effect (they don't wipe out anything).
 190  *
 191  * This routine is normally called at driver initialization time,
 192  * but may also be called MUCH earlier during kernel "command-line"
 193  * parameter processing.  As such, we cannot depend on any other parts
 194  * of the kernel (such as memory allocation) to be functioning yet.
 195  *
 196  * This is too bad, as otherwise we could dynamically allocate the
 197  * ide_drive_t structs as needed, rather than always consuming memory
 198  * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
 199  *
 200  * FIXME: We should stuff the setup data into __init and copy the
 201  * relevant hwifs/allocate them properly during boot.
 202  */
 203 #define MAGIC_COOKIE 0x12345678
 204 static void __init init_ide_data (void)
 205 {
 206         ide_hwif_t *hwif;
 207         unsigned int index;
 208         static unsigned long magic_cookie = MAGIC_COOKIE;
 209
 210         if (magic_cookie != MAGIC_COOKIE)
 211                 return;         /* already initialized */
 212         magic_cookie = 0;
 213
 214         /* Initialise all interface structures */
 215         for (index = 0; index < MAX_HWIFS; ++index) {
 216                 hwif = &ide_hwifs[index];
 217                 ide_init_port_data(hwif, index);
 218                 init_hwif_default(hwif, index);
 219 #if !defined(CONFIG_PPC32) || !defined(CONFIG_PCI)
 220                 hwif->irq =
 221                         ide_init_default_irq(hwif->io_ports[IDE_DATA_OFFSET]);
 222 #endif
 223         }
 224 }
 225
 226 /**
 227  *      ide_system_bus_speed    -       guess bus speed
 228  *
 229  *      ide_system_bus_speed() returns what we think is the system VESA/PCI
 230  *      bus speed (in MHz). This is used for calculating interface PIO timings.
 231  *      The default is 40 for known PCI systems, 50 otherwise.
 232  *      The "idebus=xx" parameter can be used to override this value.
 233  *      The actual value to be used is computed/displayed the first time
 234  *      through. Drivers should only use this as a last resort.
 235  *
 236  *      Returns a guessed speed in MHz.
 237  */
 238
 239 static int ide_system_bus_speed(void)
 240 {
 241 #ifdef CONFIG_PCI
 242         static struct pci_device_id pci_default[] = {
 243                 { PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID) },
 244                 { }
 245         };
 246 #else
 247 #define pci_default 0
 248 #endif /* CONFIG_PCI */
 249
 250         /* user supplied value */
 251         if (idebus_parameter)
 252                 return idebus_parameter;
 253
 254         /* safe default value for PCI or VESA and PCI*/
 255         return pci_dev_present(pci_default) ? 33 : 50;
 256 }
 257
 258 ide_hwif_t * ide_find_port(unsigned long base)
 259 {
 260         ide_hwif_t *hwif;
 261         int i;
 262
 263         for (i = 0; i < MAX_HWIFS; i++) {
 264                 hwif = &ide_hwifs[i];
 265                 if (hwif->io_ports[IDE_DATA_OFFSET] == base)
 266                         goto found;
 267         }
 268
 269         for (i = 0; i < MAX_HWIFS; i++) {
 270                 hwif = &ide_hwifs[i];
 271                 if (hwif->chipset == ide_unknown)
 272                         goto found;
 273         }
 274
 275         hwif = NULL;
 276 found:
 277         return hwif;
 278 }
 279
 280 EXPORT_SYMBOL_GPL(ide_find_port);
 281
 282 static struct resource* hwif_request_region(ide_hwif_t *hwif,
 283                                             unsigned long addr, int num)
 284 {
 285         struct resource *res = request_region(addr, num, hwif->name);
 286
 287         if (!res)
 288                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
 289                                 hwif->name, addr, addr+num-1);
 290         return res;
 291 }
 292
 293 /**
 294  *      ide_hwif_request_regions - request resources for IDE
 295  *      @hwif: interface to use
 296  *
 297  *      Requests all the needed resources for an interface.
 298  *      Right now core IDE code does this work which is deeply wrong.
 299  *      MMIO leaves it to the controller driver,
 300  *      PIO will migrate this way over time.
 301  */
 302
 303 int ide_hwif_request_regions(ide_hwif_t *hwif)
 304 {
 305         unsigned long addr;
 306         unsigned int i;
 307
 308         if (hwif->mmio)
 309                 return 0;
 310         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 311         if (addr && !hwif_request_region(hwif, addr, 1))
 312                 goto control_region_busy;
 313         hwif->straight8 = 0;
 314         addr = hwif->io_ports[IDE_DATA_OFFSET];
 315         if ((addr | 7) == hwif->io_ports[IDE_STATUS_OFFSET]) {
 316                 if (!hwif_request_region(hwif, addr, 8))
 317                         goto data_region_busy;
 318                 hwif->straight8 = 1;
 319                 return 0;
 320         }
 321         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
 322                 addr = hwif->io_ports[i];
 323                 if (!hwif_request_region(hwif, addr, 1)) {
 324                         while (--i)
 325                                 release_region(addr, 1);
 326                         goto data_region_busy;
 327                 }
 328         }
 329         return 0;
 330
 331 data_region_busy:
 332         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 333         if (addr)
 334                 release_region(addr, 1);
 335 control_region_busy:
 336         /* If any errors are return, we drop the hwif interface. */
 337         return -EBUSY;
 338 }
 339
 340 /**
 341  *      ide_hwif_release_regions - free IDE resources
 342  *
 343  *      Note that we only release the standard ports,
 344  *      and do not even try to handle any extra ports
 345  *      allocated for weird IDE interface chipsets.
 346  *
 347  *      Note also that we don't yet handle mmio resources here. More
 348  *      importantly our caller should be doing this so we need to
 349  *      restructure this as a helper function for drivers.
 350  */
 351
 352 void ide_hwif_release_regions(ide_hwif_t *hwif)
 353 {
 354         u32 i = 0;
 355
 356         if (hwif->mmio)
 357                 return;
 358         if (hwif->io_ports[IDE_CONTROL_OFFSET])
 359                 release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
 360         if (hwif->straight8) {
 361                 release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
 362                 return;
 363         }
 364         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
 365                 if (hwif->io_ports[i])
 366                         release_region(hwif->io_ports[i], 1);
 367 }
 368
 369 /**
 370  *      ide_hwif_restore        -       restore hwif to template
 371  *      @hwif: hwif to update
 372  *      @tmp_hwif: template
 373  *
 374  *      Restore hwif to a previous state by copying most settings
 375  *      from the template.
 376  */
 377
 378 static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
 379 {
 380         hwif->hwgroup                   = tmp_hwif->hwgroup;
 381
 382         hwif->gendev.parent             = tmp_hwif->gendev.parent;
 383
 384         hwif->proc                      = tmp_hwif->proc;
 385
 386         hwif->major                     = tmp_hwif->major;
 387         hwif->straight8                 = tmp_hwif->straight8;
 388         hwif->bus_state                 = tmp_hwif->bus_state;
 389
 390         hwif->host_flags                = tmp_hwif->host_flags;
 391
 392         hwif->pio_mask                  = tmp_hwif->pio_mask;
 393
 394         hwif->ultra_mask                = tmp_hwif->ultra_mask;
 395         hwif->mwdma_mask                = tmp_hwif->mwdma_mask;
 396         hwif->swdma_mask                = tmp_hwif->swdma_mask;
 397
 398         hwif->cbl                       = tmp_hwif->cbl;
 399
 400         hwif->chipset                   = tmp_hwif->chipset;
 401         hwif->hold                      = tmp_hwif->hold;
 402
 403         hwif->dev                       = tmp_hwif->dev;
 404
 405 #ifdef CONFIG_BLK_DEV_IDEPCI
 406         hwif->cds                       = tmp_hwif->cds;
 407 #endif
 408
 409         hwif->set_pio_mode              = tmp_hwif->set_pio_mode;
 410         hwif->set_dma_mode              = tmp_hwif->set_dma_mode;
 411         hwif->mdma_filter               = tmp_hwif->mdma_filter;
 412         hwif->udma_filter               = tmp_hwif->udma_filter;
 413         hwif->selectproc                = tmp_hwif->selectproc;
 414         hwif->reset_poll                = tmp_hwif->reset_poll;
 415         hwif->pre_reset                 = tmp_hwif->pre_reset;
 416         hwif->resetproc                 = tmp_hwif->resetproc;
 417         hwif->maskproc                  = tmp_hwif->maskproc;
 418         hwif->quirkproc                 = tmp_hwif->quirkproc;
 419
 420         hwif->ata_input_data            = tmp_hwif->ata_input_data;
 421         hwif->ata_output_data           = tmp_hwif->ata_output_data;
 422         hwif->atapi_input_bytes         = tmp_hwif->atapi_input_bytes;
 423         hwif->atapi_output_bytes        = tmp_hwif->atapi_output_bytes;
 424
 425         hwif->dma_host_set              = tmp_hwif->dma_host_set;
 426         hwif->dma_setup                 = tmp_hwif->dma_setup;
 427         hwif->dma_exec_cmd              = tmp_hwif->dma_exec_cmd;
 428         hwif->dma_start                 = tmp_hwif->dma_start;
 429         hwif->ide_dma_end               = tmp_hwif->ide_dma_end;
 430         hwif->ide_dma_test_irq          = tmp_hwif->ide_dma_test_irq;
 431         hwif->ide_dma_clear_irq         = tmp_hwif->ide_dma_clear_irq;
 432         hwif->dma_lost_irq              = tmp_hwif->dma_lost_irq;
 433         hwif->dma_timeout               = tmp_hwif->dma_timeout;
 434
 435         hwif->OUTB                      = tmp_hwif->OUTB;
 436         hwif->OUTBSYNC                  = tmp_hwif->OUTBSYNC;
 437         hwif->OUTW                      = tmp_hwif->OUTW;
 438         hwif->OUTSW                     = tmp_hwif->OUTSW;
 439         hwif->OUTSL                     = tmp_hwif->OUTSL;
 440
 441         hwif->INB                       = tmp_hwif->INB;
 442         hwif->INW                       = tmp_hwif->INW;
 443         hwif->INSW                      = tmp_hwif->INSW;
 444         hwif->INSL                      = tmp_hwif->INSL;
 445
 446         hwif->sg_max_nents              = tmp_hwif->sg_max_nents;
 447
 448         hwif->mmio                      = tmp_hwif->mmio;
 449         hwif->rqsize                    = tmp_hwif->rqsize;
 450
 451 #ifndef CONFIG_BLK_DEV_IDECS
 452         hwif->irq                       = tmp_hwif->irq;
 453 #endif
 454
 455         hwif->dma_base                  = tmp_hwif->dma_base;
 456         hwif->dma_command               = tmp_hwif->dma_command;
 457         hwif->dma_vendor1               = tmp_hwif->dma_vendor1;
 458         hwif->dma_status                = tmp_hwif->dma_status;
 459         hwif->dma_vendor3               = tmp_hwif->dma_vendor3;
 460         hwif->dma_prdtable              = tmp_hwif->dma_prdtable;
 461
 462         hwif->config_data               = tmp_hwif->config_data;
 463         hwif->select_data               = tmp_hwif->select_data;
 464         hwif->extra_base                = tmp_hwif->extra_base;
 465         hwif->extra_ports               = tmp_hwif->extra_ports;
 466
 467         hwif->hwif_data                 = tmp_hwif->hwif_data;
 468 }
 469
 470 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
 471 {
 472         ide_hwgroup_t *hwgroup = hwif->hwgroup;
 473
 474         spin_lock_irq(&ide_lock);
 475         /*
 476          * Remove us from the hwgroup, and free
 477          * the hwgroup if we were the only member
 478          */
 479         if (hwif->next == hwif) {
 480                 BUG_ON(hwgroup->hwif != hwif);
 481                 kfree(hwgroup);
 482         } else {
 483                 /* There is another interface in hwgroup.
 484                  * Unlink us, and set hwgroup->drive and ->hwif to
 485                  * something sane.
 486                  */
 487                 ide_hwif_t *g = hwgroup->hwif;
 488
 489                 while (g->next != hwif)
 490                         g = g->next;
 491                 g->next = hwif->next;
 492                 if (hwgroup->hwif == hwif) {
 493                         /* Chose a random hwif for hwgroup->hwif.
 494                          * It's guaranteed that there are no drives
 495                          * left in the hwgroup.
 496                          */
 497                         BUG_ON(hwgroup->drive != NULL);
 498                         hwgroup->hwif = g;
 499                 }
 500                 BUG_ON(hwgroup->hwif == hwif);
 501         }
 502         spin_unlock_irq(&ide_lock);
 503 }
 504
 505 /* Called with ide_lock held. */
 506 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
 507 {
 508         int i;
 509
 510         for (i = 0; i < MAX_DRIVES; i++) {
 511                 ide_drive_t *drive = &hwif->drives[i];
 512
 513                 if (drive->present) {
 514                         spin_unlock_irq(&ide_lock);
 515                         device_unregister(&drive->gendev);
 516                         wait_for_completion(&drive->gendev_rel_comp);
 517                         spin_lock_irq(&ide_lock);
 518                 }
 519         }
 520 }
 521
 522 void ide_port_unregister_devices(ide_hwif_t *hwif)
 523 {
 524         mutex_lock(&ide_cfg_mtx);
 525         spin_lock_irq(&ide_lock);
 526         __ide_port_unregister_devices(hwif);
 527         hwif->present = 0;
 528         ide_port_init_devices_data(hwif);
 529         spin_unlock_irq(&ide_lock);
 530         mutex_unlock(&ide_cfg_mtx);
 531 }
 532 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
 533
 534 /**
 535  *      ide_unregister          -       free an IDE interface
 536  *      @index: index of interface (will change soon to a pointer)
 537  *      @init_default: init default hwif flag
 538  *      @restore: restore hwif flag
 539  *
 540  *      Perform the final unregister of an IDE interface. At the moment
 541  *      we don't refcount interfaces so this will also get split up.
 542  *
 543  *      Locking:
 544  *      The caller must not hold the IDE locks
 545  *      The drive present/vanishing is not yet properly locked
 546  *      Take care with the callbacks. These have been split to avoid
 547  *      deadlocking the IDE layer. The shutdown callback is called
 548  *      before we take the lock and free resources. It is up to the
 549  *      caller to be sure there is no pending I/O here, and that
 550  *      the interface will not be reopened (present/vanishing locking
 551  *      isn't yet done BTW). After we commit to the final kill we
 552  *      call the cleanup callback with the ide locks held.
 553  *
 554  *      Unregister restores the hwif structures to the default state.
 555  *      This is raving bonkers.
 556  */
 557
 558 void ide_unregister(unsigned int index, int init_default, int restore)
 559 {
 560         ide_hwif_t *hwif, *g;
 561         static ide_hwif_t tmp_hwif; /* protected by ide_cfg_mtx */
 562         ide_hwgroup_t *hwgroup;
 563         int irq_count = 0;
 564
 565         BUG_ON(index >= MAX_HWIFS);
 566
 567         BUG_ON(in_interrupt());
 568         BUG_ON(irqs_disabled());
 569         mutex_lock(&ide_cfg_mtx);
 570         spin_lock_irq(&ide_lock);
 571         hwif = &ide_hwifs[index];
 572         if (!hwif->present)
 573                 goto abort;
 574         __ide_port_unregister_devices(hwif);
 575         hwif->present = 0;
 576
 577         spin_unlock_irq(&ide_lock);
 578
 579         ide_proc_unregister_port(hwif);
 580
 581         hwgroup = hwif->hwgroup;
 582         /*
 583          * free the irq if we were the only hwif using it
 584          */
 585         g = hwgroup->hwif;
 586         do {
 587                 if (g->irq == hwif->irq)
 588                         ++irq_count;
 589                 g = g->next;
 590         } while (g != hwgroup->hwif);
 591         if (irq_count == 1)
 592                 free_irq(hwif->irq, hwgroup);
 593
 594         ide_remove_port_from_hwgroup(hwif);
 595
 596         device_unregister(hwif->portdev);
 597         device_unregister(&hwif->gendev);
 598         wait_for_completion(&hwif->gendev_rel_comp);
 599
 600         /*
 601          * Remove us from the kernel's knowledge
 602          */
 603         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 604         kfree(hwif->sg_table);
 605         unregister_blkdev(hwif->major, hwif->name);
 606         spin_lock_irq(&ide_lock);
 607
 608         if (hwif->dma_base) {
 609                 (void) ide_release_dma(hwif);
 610
 611                 hwif->dma_base = 0;
 612                 hwif->dma_command = 0;
 613                 hwif->dma_vendor1 = 0;
 614                 hwif->dma_status = 0;
 615                 hwif->dma_vendor3 = 0;
 616                 hwif->dma_prdtable = 0;
 617
 618                 hwif->extra_base  = 0;
 619                 hwif->extra_ports = 0;
 620         }
 621
 622         ide_hwif_release_regions(hwif);
 623
 624         /* copy original settings */
 625         tmp_hwif = *hwif;
 626
 627         /* restore hwif data to pristine status */
 628         ide_init_port_data(hwif, index);
 629
 630         if (init_default)
 631                 init_hwif_default(hwif, index);
 632
 633         if (restore)
 634                 ide_hwif_restore(hwif, &tmp_hwif);
 635
 636 abort:
 637         spin_unlock_irq(&ide_lock);
 638         mutex_unlock(&ide_cfg_mtx);
 639 }
 640
 641 EXPORT_SYMBOL(ide_unregister);
 642
 643 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
 644 {
 645         memcpy(hwif->io_ports, hw->io_ports, sizeof(hwif->io_ports));
 646         hwif->irq = hw->irq;
 647         hwif->noprobe = 0;
 648         hwif->chipset = hw->chipset;
 649         hwif->gendev.parent = hw->dev;
 650         hwif->ack_intr = hw->ack_intr;
 651 }
 652 EXPORT_SYMBOL_GPL(ide_init_port_hw);
 653
 654 /**
 655  *      ide_register_hw         -       register IDE interface
 656  *      @hw: hardware registers
 657  *      @quirkproc: quirkproc function
 658  *      @hwifp: pointer to returned hwif
 659  *
 660  *      Register an IDE interface, specifying exactly the registers etc.
 661  *
 662  *      Returns -1 on error.
 663  */
 664
 665 static int ide_register_hw(hw_regs_t *hw, void (*quirkproc)(ide_drive_t *),
 666                            ide_hwif_t **hwifp)
 667 {
 668         int index, retry = 1;
 669         ide_hwif_t *hwif;
 670         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
 671
 672         do {
 673                 hwif = ide_find_port(hw->io_ports[IDE_DATA_OFFSET]);
 674                 if (hwif)
 675                         goto found;
 676                 for (index = 0; index < MAX_HWIFS; index++)
 677                         ide_unregister(index, 1, 1);
 678         } while (retry--);
 679         return -1;
 680 found:
 681         index = hwif->index;
 682         if (hwif->present)
 683                 ide_unregister(index, 0, 1);
 684         else if (!hwif->hold)
 685                 ide_init_port_data(hwif, index);
 686
 687         ide_init_port_hw(hwif, hw);
 688         hwif->quirkproc = quirkproc;
 689
 690         idx[0] = index;
 691
 692         ide_device_add(idx, NULL);
 693
 694         if (hwifp)
 695                 *hwifp = hwif;
 696
 697         return hwif->present ? index : -1;
 698 }
 699
 700 /*
 701  *      Locks for IDE setting functionality
 702  */
 703
 704 DEFINE_MUTEX(ide_setting_mtx);
 705
 706 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 707
 708 /**
 709  *      ide_spin_wait_hwgroup   -       wait for group
 710  *      @drive: drive in the group
 711  *
 712  *      Wait for an IDE device group to go non busy and then return
 713  *      holding the ide_lock which guards the hwgroup->busy status
 714  *      and right to use it.
 715  */
 716
 717 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 718 {
 719         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 720         unsigned long timeout = jiffies + (3 * HZ);
 721
 722         spin_lock_irq(&ide_lock);
 723
 724         while (hwgroup->busy) {
 725                 unsigned long lflags;
 726                 spin_unlock_irq(&ide_lock);
 727                 local_irq_set(lflags);
 728                 if (time_after(jiffies, timeout)) {
 729                         local_irq_restore(lflags);
 730                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 731                         return -EBUSY;
 732                 }
 733                 local_irq_restore(lflags);
 734                 spin_lock_irq(&ide_lock);
 735         }
 736         return 0;
 737 }
 738
 739 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 740
 741 int set_io_32bit(ide_drive_t *drive, int arg)
 742 {
 743         if (drive->no_io_32bit)
 744                 return -EPERM;
 745
 746         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 747                 return -EINVAL;
 748
 749         if (ide_spin_wait_hwgroup(drive))
 750                 return -EBUSY;
 751
 752         drive->io_32bit = arg;
 753
 754         spin_unlock_irq(&ide_lock);
 755
 756         return 0;
 757 }
 758
 759 static int set_ksettings(ide_drive_t *drive, int arg)
 760 {
 761         if (arg < 0 || arg > 1)
 762                 return -EINVAL;
 763
 764         if (ide_spin_wait_hwgroup(drive))
 765                 return -EBUSY;
 766         drive->keep_settings = arg;
 767         spin_unlock_irq(&ide_lock);
 768
 769         return 0;
 770 }
 771
 772 int set_using_dma(ide_drive_t *drive, int arg)
 773 {
 774 #ifdef CONFIG_BLK_DEV_IDEDMA
 775         ide_hwif_t *hwif = drive->hwif;
 776         int err = -EPERM;
 777
 778         if (arg < 0 || arg > 1)
 779                 return -EINVAL;
 780
 781         if (!drive->id || !(drive->id->capability & 1))
 782                 goto out;
 783
 784         if (hwif->dma_host_set == NULL)
 785                 goto out;
 786
 787         err = -EBUSY;
 788         if (ide_spin_wait_hwgroup(drive))
 789                 goto out;
 790         /*
 791          * set ->busy flag, unlock and let it ride
 792          */
 793         hwif->hwgroup->busy = 1;
 794         spin_unlock_irq(&ide_lock);
 795
 796         err = 0;
 797
 798         if (arg) {
 799                 if (ide_set_dma(drive))
 800                         err = -EIO;
 801         } else
 802                 ide_dma_off(drive);
 803
 804         /*
 805          * lock, clear ->busy flag and unlock before leaving
 806          */
 807         spin_lock_irq(&ide_lock);
 808         hwif->hwgroup->busy = 0;
 809         spin_unlock_irq(&ide_lock);
 810 out:
 811         return err;
 812 #else
 813         if (arg < 0 || arg > 1)
 814                 return -EINVAL;
 815
 816         return -EPERM;
 817 #endif
 818 }
 819
 820 int set_pio_mode(ide_drive_t *drive, int arg)
 821 {
 822         struct request rq;
 823
 824         if (arg < 0 || arg > 255)
 825                 return -EINVAL;
 826
 827         if (drive->hwif->set_pio_mode == NULL)
 828                 return -ENOSYS;
 829
 830         if (drive->special.b.set_tune)
 831                 return -EBUSY;
 832
 833         ide_init_drive_cmd(&rq);
 834         rq.cmd_type = REQ_TYPE_ATA_TASKFILE;
 835
 836         drive->tune_req = (u8) arg;
 837         drive->special.b.set_tune = 1;
 838         (void) ide_do_drive_cmd(drive, &rq, ide_wait);
 839         return 0;
 840 }
 841
 842 static int set_unmaskirq(ide_drive_t *drive, int arg)
 843 {
 844         if (drive->no_unmask)
 845                 return -EPERM;
 846
 847         if (arg < 0 || arg > 1)
 848                 return -EINVAL;
 849
 850         if (ide_spin_wait_hwgroup(drive))
 851                 return -EBUSY;
 852         drive->unmask = arg;
 853         spin_unlock_irq(&ide_lock);
 854
 855         return 0;
 856 }
 857
 858 /**
 859  *      system_bus_clock        -       clock guess
 860  *
 861  *      External version of the bus clock guess used by very old IDE drivers
 862  *      for things like VLB timings. Should not be used.
 863  */
 864
 865 int system_bus_clock (void)
 866 {
 867         return system_bus_speed;
 868 }
 869
 870 EXPORT_SYMBOL(system_bus_clock);
 871
 872 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 873 {
 874         ide_drive_t *drive = dev->driver_data;
 875         ide_hwif_t *hwif = HWIF(drive);
 876         struct request rq;
 877         struct request_pm_state rqpm;
 878         ide_task_t args;
 879         int ret;
 880
 881         /* Call ACPI _GTM only once */
 882         if (!(drive->dn % 2))
 883                 ide_acpi_get_timing(hwif);
 884
 885         memset(&rq, 0, sizeof(rq));
 886         memset(&rqpm, 0, sizeof(rqpm));
 887         memset(&args, 0, sizeof(args));
 888         rq.cmd_type = REQ_TYPE_PM_SUSPEND;
 889         rq.special = &args;
 890         rq.data = &rqpm;
 891         rqpm.pm_step = ide_pm_state_start_suspend;
 892         if (mesg.event == PM_EVENT_PRETHAW)
 893                 mesg.event = PM_EVENT_FREEZE;
 894         rqpm.pm_state = mesg.event;
 895
 896         ret = ide_do_drive_cmd(drive, &rq, ide_wait);
 897         /* only call ACPI _PS3 after both drivers are suspended */
 898         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 899                  && hwif->drives[1].present)
 900                  || !hwif->drives[0].present
 901                  || !hwif->drives[1].present))
 902                 ide_acpi_set_state(hwif, 0);
 903         return ret;
 904 }
 905
 906 static int generic_ide_resume(struct device *dev)
 907 {
 908         ide_drive_t *drive = dev->driver_data;
 909         ide_hwif_t *hwif = HWIF(drive);
 910         struct request rq;
 911         struct request_pm_state rqpm;
 912         ide_task_t args;
 913         int err;
 914
 915         /* Call ACPI _STM only once */
 916         if (!(drive->dn % 2)) {
 917                 ide_acpi_set_state(hwif, 1);
 918                 ide_acpi_push_timing(hwif);
 919         }
 920
 921         ide_acpi_exec_tfs(drive);
 922
 923         memset(&rq, 0, sizeof(rq));
 924         memset(&rqpm, 0, sizeof(rqpm));
 925         memset(&args, 0, sizeof(args));
 926         rq.cmd_type = REQ_TYPE_PM_RESUME;
 927         rq.special = &args;
 928         rq.data = &rqpm;
 929         rqpm.pm_step = ide_pm_state_start_resume;
 930         rqpm.pm_state = PM_EVENT_ON;
 931
 932         err = ide_do_drive_cmd(drive, &rq, ide_head_wait);
 933
 934         if (err == 0 && dev->driver) {
 935                 ide_driver_t *drv = to_ide_driver(dev->driver);
 936
 937                 if (drv->resume)
 938                         drv->resume(drive);
 939         }
 940
 941         return err;
 942 }
 943
 944 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 945                         unsigned int cmd, unsigned long arg)
 946 {
 947         unsigned long flags;
 948         ide_driver_t *drv;
 949         void __user *p = (void __user *)arg;
 950         int err = 0, (*setfunc)(ide_drive_t *, int);
 951         u8 *val;
 952
 953         switch (cmd) {
 954         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
 955         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
 956         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
 957         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
 958         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
 959         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
 960         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
 961         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
 962         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
 963         }
 964
 965         switch (cmd) {
 966                 case HDIO_OBSOLETE_IDENTITY:
 967                 case HDIO_GET_IDENTITY:
 968                         if (bdev != bdev->bd_contains)
 969                                 return -EINVAL;
 970                         if (drive->id_read == 0)
 971                                 return -ENOMSG;
 972                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
 973                                 return -EFAULT;
 974                         return 0;
 975
 976                 case HDIO_GET_NICE:
 977                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
 978                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
 979                                         drive->nice1 << IDE_NICE_1,
 980                                         (long __user *) arg);
 981 #ifdef CONFIG_IDE_TASK_IOCTL
 982                 case HDIO_DRIVE_TASKFILE:
 983                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 984                                 return -EACCES;
 985                         switch(drive->media) {
 986                                 case ide_disk:
 987                                         return ide_taskfile_ioctl(drive, cmd, arg);
 988                                 default:
 989                                         return -ENOMSG;
 990                         }
 991 #endif /* CONFIG_IDE_TASK_IOCTL */
 992
 993                 case HDIO_DRIVE_CMD:
 994                         if (!capable(CAP_SYS_RAWIO))
 995                                 return -EACCES;
 996                         return ide_cmd_ioctl(drive, cmd, arg);
 997
 998                 case HDIO_DRIVE_TASK:
 999                         if (!capable(CAP_SYS_RAWIO))
1000                                 return -EACCES;
1001                         return ide_task_ioctl(drive, cmd, arg);
1002
1003                 case HDIO_SCAN_HWIF:
1004                 {
1005                         hw_regs_t hw;
1006                         int args[3];
1007                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1008                         if (copy_from_user(args, p, 3 * sizeof(int)))
1009                                 return -EFAULT;
1010                         memset(&hw, 0, sizeof(hw));
1011                         ide_init_hwif_ports(&hw, (unsigned long) args[0],
1012                                             (unsigned long) args[1], NULL);
1013                         hw.irq = args[2];
1014                         if (ide_register_hw(&hw, NULL, NULL) == -1)
1015                                 return -EIO;
1016                         return 0;
1017                 }
1018                 case HDIO_UNREGISTER_HWIF:
1019                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1020                         /* (arg > MAX_HWIFS) checked in function */
1021                         ide_unregister(arg, 1, 1);
1022                         return 0;
1023                 case HDIO_SET_NICE:
1024                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1025                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
1026                                 return -EPERM;
1027                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
1028                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
1029                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
1030                                 drive->dsc_overlap = 0;
1031                                 return -EPERM;
1032                         }
1033                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
1034                         return 0;
1035                 case HDIO_DRIVE_RESET:
1036                         if (!capable(CAP_SYS_ADMIN))
1037                                 return -EACCES;
1038
1039                         /*
1040                          *      Abort the current command on the
1041                          *      group if there is one, taking
1042                          *      care not to allow anything else
1043                          *      to be queued and to die on the
1044                          *      spot if we miss one somehow
1045                          */
1046
1047                         spin_lock_irqsave(&ide_lock, flags);
1048
1049                         if (HWGROUP(drive)->resetting) {
1050                                 spin_unlock_irqrestore(&ide_lock, flags);
1051                                 return -EBUSY;
1052                         }
1053
1054                         ide_abort(drive, "drive reset");
1055
1056                         BUG_ON(HWGROUP(drive)->handler);
1057
1058                         /* Ensure nothing gets queued after we
1059                            drop the lock. Reset will clear the busy */
1060
1061                         HWGROUP(drive)->busy = 1;
1062                         spin_unlock_irqrestore(&ide_lock, flags);
1063                         (void) ide_do_reset(drive);
1064
1065                         return 0;
1066                 case HDIO_GET_BUSSTATE:
1067                         if (!capable(CAP_SYS_ADMIN))
1068                                 return -EACCES;
1069                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
1070                                 return -EFAULT;
1071                         return 0;
1072
1073                 case HDIO_SET_BUSSTATE:
1074                         if (!capable(CAP_SYS_ADMIN))
1075                                 return -EACCES;
1076                         return -EOPNOTSUPP;
1077                 default:
1078                         return -EINVAL;
1079         }
1080
1081 read_val:
1082         mutex_lock(&ide_setting_mtx);
1083         spin_lock_irqsave(&ide_lock, flags);
1084         err = *val;
1085         spin_unlock_irqrestore(&ide_lock, flags);
1086         mutex_unlock(&ide_setting_mtx);
1087         return err >= 0 ? put_user(err, (long __user *)arg) : err;
1088
1089 set_val:
1090         if (bdev != bdev->bd_contains)
1091                 err = -EINVAL;
1092         else {
1093                 if (!capable(CAP_SYS_ADMIN))
1094                         err = -EACCES;
1095                 else {
1096                         mutex_lock(&ide_setting_mtx);
1097                         err = setfunc(drive, arg);
1098                         mutex_unlock(&ide_setting_mtx);
1099                 }
1100         }
1101         return err;
1102 }
1103
1104 EXPORT_SYMBOL(generic_ide_ioctl);
1105
1106 /*
1107  * stridx() returns the offset of c within s,
1108  * or -1 if c is '\0' or not found within s.
1109  */
1110 static int __init stridx (const char *s, char c)
1111 {
1112         char *i = strchr(s, c);
1113         return (i && c) ? i - s : -1;
1114 }
1115
1116 /*
1117  * match_parm() does parsing for ide_setup():
1118  *
1119  * 1. the first char of s must be '='.
1120  * 2. if the remainder matches one of the supplied keywords,
1121  *     the index (1 based) of the keyword is negated and returned.
1122  * 3. if the remainder is a series of no more than max_vals numbers
1123  *     separated by commas, the numbers are saved in vals[] and a
1124  *     count of how many were saved is returned.  Base10 is assumed,
1125  *     and base16 is allowed when prefixed with "0x".
1126  * 4. otherwise, zero is returned.
1127  */
1128 static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
1129 {
1130         static const char *decimal = "0123456789";
1131         static const char *hex = "0123456789abcdef";
1132         int i, n;
1133
1134         if (*s++ == '=') {
1135                 /*
1136                  * Try matching against the supplied keywords,
1137                  * and return -(index+1) if we match one
1138                  */
1139                 if (keywords != NULL) {
1140                         for (i = 0; *keywords != NULL; ++i) {
1141                                 if (!strcmp(s, *keywords++))
1142                                         return -(i+1);
1143                         }
1144                 }
1145                 /*
1146                  * Look for a series of no more than "max_vals"
1147                  * numeric values separated by commas, in base10,
1148                  * or base16 when prefixed with "0x".
1149                  * Return a count of how many were found.
1150                  */
1151                 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
1152                         vals[n] = i;
1153                         while ((i = stridx(decimal, *++s)) >= 0)
1154                                 vals[n] = (vals[n] * 10) + i;
1155                         if (*s == 'x' && !vals[n]) {
1156                                 while ((i = stridx(hex, *++s)) >= 0)
1157                                         vals[n] = (vals[n] * 0x10) + i;
1158                         }
1159                         if (++n == max_vals)
1160                                 break;
1161                         if (*s == ',' || *s == ';')
1162                                 ++s;
1163                 }
1164                 if (!*s)
1165                         return n;
1166         }
1167         return 0;       /* zero = nothing matched */
1168 }
1169
1170 extern int probe_ali14xx;
1171 extern int probe_umc8672;
1172 extern int probe_dtc2278;
1173 extern int probe_ht6560b;
1174 extern int probe_qd65xx;
1175 extern int cmd640_vlb;
1176
1177 static int __initdata is_chipset_set[MAX_HWIFS];
1178
1179 /*
1180  * ide_setup() gets called VERY EARLY during initialization,
1181  * to handle kernel "command line" strings beginning with "hdx=" or "ide".
1182  *
1183  * Remember to update Documentation/ide/ide.txt if you change something here.
1184  */
1185 static int __init ide_setup(char *s)
1186 {
1187         int i, vals[3];
1188         ide_hwif_t *hwif;
1189         ide_drive_t *drive;
1190         unsigned int hw, unit;
1191         const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
1192         const char max_hwif  = '0' + (MAX_HWIFS - 1);
1193
1194
1195         if (strncmp(s,"hd",2) == 0 && s[2] == '=')      /* hd= is for hd.c   */
1196                 return 0;                               /* driver and not us */
1197
1198         if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
1199                 return 0;
1200
1201         printk(KERN_INFO "ide_setup: %s", s);
1202         init_ide_data ();
1203
1204 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
1205         if (!strcmp(s, "ide=doubler")) {
1206                 extern int ide_doubler;
1207
1208                 printk(" : Enabled support for IDE doublers\n");
1209                 ide_doubler = 1;
1210                 return 1;
1211         }
1212 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
1213
1214         if (!strcmp(s, "ide=nodma")) {
1215                 printk(" : Prevented DMA\n");
1216                 noautodma = 1;
1217                 goto obsolete_option;
1218         }
1219
1220 #ifdef CONFIG_BLK_DEV_IDEACPI
1221         if (!strcmp(s, "ide=noacpi")) {
1222                 //printk(" : Disable IDE ACPI support.\n");
1223                 ide_noacpi = 1;
1224                 return 1;
1225         }
1226         if (!strcmp(s, "ide=acpigtf")) {
1227                 //printk(" : Enable IDE ACPI _GTF support.\n");
1228                 ide_noacpitfs = 0;
1229                 return 1;
1230         }
1231         if (!strcmp(s, "ide=acpionboot")) {
1232                 //printk(" : Call IDE ACPI methods on boot.\n");
1233                 ide_noacpionboot = 0;
1234                 return 1;
1235         }
1236 #endif /* CONFIG_BLK_DEV_IDEACPI */
1237
1238         /*
1239          * Look for drive options:  "hdx="
1240          */
1241         if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
1242                 const char *hd_words[] = {
1243                         "none", "noprobe", "nowerr", "cdrom", "nodma",
1244                         "autotune", "noautotune", "-8", "-9", "-10",
1245                         "noflush", "remap", "remap63", "scsi", NULL };
1246                 unit = s[2] - 'a';
1247                 hw   = unit / MAX_DRIVES;
1248                 unit = unit % MAX_DRIVES;
1249                 hwif = &ide_hwifs[hw];
1250                 drive = &hwif->drives[unit];
1251                 if (strncmp(s + 4, "ide-", 4) == 0) {
1252                         strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
1253                         goto obsolete_option;
1254                 }
1255                 switch (match_parm(&s[3], hd_words, vals, 3)) {
1256                         case -1: /* "none" */
1257                         case -2: /* "noprobe" */
1258                                 drive->noprobe = 1;
1259                                 goto done;
1260                         case -3: /* "nowerr" */
1261                                 drive->bad_wstat = BAD_R_STAT;
1262                                 hwif->noprobe = 0;
1263                                 goto done;
1264                         case -4: /* "cdrom" */
1265                                 drive->present = 1;
1266                                 drive->media = ide_cdrom;
1267                                 /* an ATAPI device ignores DRDY */
1268                                 drive->ready_stat = 0;
1269                                 hwif->noprobe = 0;
1270                                 goto done;
1271                         case -5: /* nodma */
1272                                 drive->nodma = 1;
1273                                 goto done;
1274                         case -6: /* "autotune" */
1275                                 drive->autotune = IDE_TUNE_AUTO;
1276                                 goto obsolete_option;
1277                         case -7: /* "noautotune" */
1278                                 drive->autotune = IDE_TUNE_NOAUTO;
1279                                 goto obsolete_option;
1280                         case -11: /* noflush */
1281                                 drive->noflush = 1;
1282                                 goto done;
1283                         case -12: /* "remap" */
1284                                 drive->remap_0_to_1 = 1;
1285                                 goto obsolete_option;
1286                         case -13: /* "remap63" */
1287                                 drive->sect0 = 63;
1288                                 goto obsolete_option;
1289                         case -14: /* "scsi" */
1290                                 drive->scsi = 1;
1291                                 goto obsolete_option;
1292                         case 3: /* cyl,head,sect */
1293                                 drive->media    = ide_disk;
1294                                 drive->ready_stat = READY_STAT;
1295                                 drive->cyl      = drive->bios_cyl  = vals[0];
1296                                 drive->head     = drive->bios_head = vals[1];
1297                                 drive->sect     = drive->bios_sect = vals[2];
1298                                 drive->present  = 1;
1299                                 drive->forced_geom = 1;
1300                                 hwif->noprobe = 0;
1301                                 goto done;
1302                         default:
1303                                 goto bad_option;
1304                 }
1305         }
1306
1307         if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
1308                 goto bad_option;
1309         /*
1310          * Look for bus speed option:  "idebus="
1311          */
1312         if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
1313                 if (match_parm(&s[6], NULL, vals, 1) != 1)
1314                         goto bad_option;
1315                 if (vals[0] >= 20 && vals[0] <= 66) {
1316                         idebus_parameter = vals[0];
1317                 } else
1318                         printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
1319                 goto done;
1320         }
1321         /*
1322          * Look for interface options:  "idex="
1323          */
1324         if (s[3] >= '0' && s[3] <= max_hwif) {
1325                 /*
1326                  * Be VERY CAREFUL changing this: note hardcoded indexes below
1327                  * (-8, -9, -10) are reserved to ease the hardcoding.
1328                  */
1329                 static const char *ide_words[] = {
1330                         "noprobe", "serialize", "minus3", "minus4",
1331                         "reset", "minus6", "ata66", "minus8", "minus9",
1332                         "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
1333                         "dtc2278", "umc8672", "ali14xx", NULL };
1334
1335                 hw_regs_t hwregs;
1336
1337                 hw = s[3] - '0';
1338                 hwif = &ide_hwifs[hw];
1339                 i = match_parm(&s[4], ide_words, vals, 3);
1340
1341                 /*
1342                  * Cryptic check to ensure chipset not already set for hwif.
1343                  * Note: we can't depend on hwif->chipset here.
1344                  */
1345                 if ((i >= -18 && i <= -11) || (i > 0 && i <= 3)) {
1346                         /* chipset already specified */
1347                         if (is_chipset_set[hw])
1348                                 goto bad_option;
1349                         if (i > -18 && i <= -11) {
1350                                 /* these drivers are for "ide0=" only */
1351                                 if (hw != 0)
1352                                         goto bad_hwif;
1353                                 /* chipset already specified for 2nd port */
1354                                 if (is_chipset_set[hw+1])
1355                                         goto bad_option;
1356                         }
1357                         is_chipset_set[hw] = 1;
1358                         printk("\n");
1359                 }
1360
1361                 switch (i) {
1362 #ifdef CONFIG_BLK_DEV_ALI14XX
1363                         case -17: /* "ali14xx" */
1364                                 probe_ali14xx = 1;
1365                                 goto obsolete_option;
1366 #endif
1367 #ifdef CONFIG_BLK_DEV_UMC8672
1368                         case -16: /* "umc8672" */
1369                                 probe_umc8672 = 1;
1370                                 goto obsolete_option;
1371 #endif
1372 #ifdef CONFIG_BLK_DEV_DTC2278
1373                         case -15: /* "dtc2278" */
1374                                 probe_dtc2278 = 1;
1375                                 goto obsolete_option;
1376 #endif
1377 #ifdef CONFIG_BLK_DEV_CMD640
1378                         case -14: /* "cmd640_vlb" */
1379                                 cmd640_vlb = 1;
1380                                 goto obsolete_option;
1381 #endif
1382 #ifdef CONFIG_BLK_DEV_HT6560B
1383                         case -13: /* "ht6560b" */
1384                                 probe_ht6560b = 1;
1385                                 goto obsolete_option;
1386 #endif
1387 #ifdef CONFIG_BLK_DEV_QD65XX
1388                         case -12: /* "qd65xx" */
1389                                 probe_qd65xx = 1;
1390                                 goto obsolete_option;
1391 #endif
1392 #ifdef CONFIG_BLK_DEV_4DRIVES
1393                         case -11: /* "four" drives on one set of ports */
1394                         {
1395                                 ide_hwif_t *mate = &ide_hwifs[hw^1];
1396                                 mate->drives[0].select.all ^= 0x20;
1397                                 mate->drives[1].select.all ^= 0x20;
1398                                 hwif->chipset = mate->chipset = ide_4drives;
1399                                 mate->irq = hwif->irq;
1400                                 memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
1401                                 hwif->mate = mate;
1402                                 mate->mate = hwif;
1403                                 hwif->serialized = mate->serialized = 1;
1404                                 goto obsolete_option;
1405                         }
1406 #endif /* CONFIG_BLK_DEV_4DRIVES */
1407                         case -10: /* minus10 */
1408                         case -9: /* minus9 */
1409                         case -8: /* minus8 */
1410                         case -6:
1411                         case -4:
1412                         case -3:
1413                                 goto bad_option;
1414                         case -7: /* ata66 */
1415 #ifdef CONFIG_BLK_DEV_IDEPCI
1416                                 /*
1417                                  * Use ATA_CBL_PATA40_SHORT so drive side
1418                                  * cable detection is also overriden.
1419                                  */
1420                                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1421                                 goto obsolete_option;
1422 #else
1423                                 goto bad_hwif;
1424 #endif
1425                         case -5: /* "reset" */
1426                                 hwif->reset = 1;
1427                                 goto obsolete_option;
1428                         case -2: /* "serialize" */
1429                                 hwif->mate = &ide_hwifs[hw^1];
1430                                 hwif->mate->mate = hwif;
1431                                 hwif->serialized = hwif->mate->serialized = 1;
1432                                 goto obsolete_option;
1433
1434                         case -1: /* "noprobe" */
1435                                 hwif->noprobe = 1;
1436                                 goto obsolete_option;
1437
1438                         case 1: /* base */
1439                                 vals[1] = vals[0] + 0x206; /* default ctl */
1440                         case 2: /* base,ctl */
1441                                 vals[2] = 0;    /* default irq = probe for it */
1442                         case 3: /* base,ctl,irq */
1443                                 memset(&hwregs, 0, sizeof(hwregs));
1444                                 ide_init_hwif_ports(&hwregs, vals[0], vals[1], &hwif->irq);
1445                                 memcpy(hwif->io_ports, hwregs.io_ports, sizeof(hwif->io_ports));
1446                                 hwif->irq      = vals[2];
1447                                 hwif->noprobe  = 0;
1448                                 hwif->chipset  = ide_forced;
1449                                 goto obsolete_option;
1450
1451                         case 0: goto bad_option;
1452                         default:
1453                                 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
1454                                 return 1;
1455                 }
1456         }
1457 bad_option:
1458         printk(" -- BAD OPTION\n");
1459         return 1;
1460 obsolete_option:
1461         printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
1462         return 1;
1463 bad_hwif:
1464         printk("-- NOT SUPPORTED ON ide%d", hw);
1465 done:
1466         printk("\n");
1467         return 1;
1468 }
1469
1470 EXPORT_SYMBOL(ide_lock);
1471
1472 static int ide_bus_match(struct device *dev, struct device_driver *drv)
1473 {
1474         return 1;
1475 }
1476
1477 static char *media_string(ide_drive_t *drive)
1478 {
1479         switch (drive->media) {
1480         case ide_disk:
1481                 return "disk";
1482         case ide_cdrom:
1483                 return "cdrom";
1484         case ide_tape:
1485                 return "tape";
1486         case ide_floppy:
1487                 return "floppy";
1488         case ide_optical:
1489                 return "optical";
1490         default:
1491                 return "UNKNOWN";
1492         }
1493 }
1494
1495 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
1496 {
1497         ide_drive_t *drive = to_ide_device(dev);
1498         return sprintf(buf, "%s\n", media_string(drive));
1499 }
1500
1501 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
1502 {
1503         ide_drive_t *drive = to_ide_device(dev);
1504         return sprintf(buf, "%s\n", drive->name);
1505 }
1506
1507 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1508 {
1509         ide_drive_t *drive = to_ide_device(dev);
1510         return sprintf(buf, "ide:m-%s\n", media_string(drive));
1511 }
1512
1513 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
1514                           char *buf)
1515 {
1516         ide_drive_t *drive = to_ide_device(dev);
1517         return sprintf(buf, "%s\n", drive->id->model);
1518 }
1519
1520 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
1521                              char *buf)
1522 {
1523         ide_drive_t *drive = to_ide_device(dev);
1524         return sprintf(buf, "%s\n", drive->id->fw_rev);
1525 }
1526
1527 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
1528                            char *buf)
1529 {
1530         ide_drive_t *drive = to_ide_device(dev);
1531         return sprintf(buf, "%s\n", drive->id->serial_no);
1532 }
1533
1534 static struct device_attribute ide_dev_attrs[] = {
1535         __ATTR_RO(media),
1536         __ATTR_RO(drivename),
1537         __ATTR_RO(modalias),
1538         __ATTR_RO(model),
1539         __ATTR_RO(firmware),
1540         __ATTR(serial, 0400, serial_show, NULL),
1541         __ATTR_NULL
1542 };
1543
1544 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
1545 {
1546         ide_drive_t *drive = to_ide_device(dev);
1547
1548         add_uevent_var(env, "MEDIA=%s", media_string(drive));
1549         add_uevent_var(env, "DRIVENAME=%s", drive->name);
1550         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
1551         return 0;
1552 }
1553
1554 static int generic_ide_probe(struct device *dev)
1555 {
1556         ide_drive_t *drive = to_ide_device(dev);
1557         ide_driver_t *drv = to_ide_driver(dev->driver);
1558
1559         return drv->probe ? drv->probe(drive) : -ENODEV;
1560 }
1561
1562 static int generic_ide_remove(struct device *dev)
1563 {
1564         ide_drive_t *drive = to_ide_device(dev);
1565         ide_driver_t *drv = to_ide_driver(dev->driver);
1566
1567         if (drv->remove)
1568                 drv->remove(drive);
1569
1570         return 0;
1571 }
1572
1573 static void generic_ide_shutdown(struct device *dev)
1574 {
1575         ide_drive_t *drive = to_ide_device(dev);
1576         ide_driver_t *drv = to_ide_driver(dev->driver);
1577
1578         if (dev->driver && drv->shutdown)
1579                 drv->shutdown(drive);
1580 }
1581
1582 struct bus_type ide_bus_type = {
1583         .name           = "ide",
1584         .match          = ide_bus_match,
1585         .uevent         = ide_uevent,
1586         .probe          = generic_ide_probe,
1587         .remove         = generic_ide_remove,
1588         .shutdown       = generic_ide_shutdown,
1589         .dev_attrs      = ide_dev_attrs,
1590         .suspend        = generic_ide_suspend,
1591         .resume         = generic_ide_resume,
1592 };
1593
1594 EXPORT_SYMBOL_GPL(ide_bus_type);
1595
1596 static void ide_port_class_release(struct device *portdev)
1597 {
1598         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1599
1600         put_device(&hwif->gendev);
1601 }
1602
1603 /*
1604  * This is gets invoked once during initialization, to set *everything* up
1605  */
1606 static int __init ide_init(void)
1607 {
1608         int ret;
1609
1610         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
1611         system_bus_speed = ide_system_bus_speed();
1612
1613         printk(KERN_INFO "ide: Assuming %dMHz system bus speed "
1614                          "for PIO modes%s\n", system_bus_speed,
1615                         idebus_parameter ? "" : "; override with idebus=xx");
1616
1617         ret = bus_register(&ide_bus_type);
1618         if (ret < 0) {
1619                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1620                 return ret;
1621         }
1622
1623         ide_port_class = class_create(THIS_MODULE, "ide_port");
1624         if (IS_ERR(ide_port_class)) {
1625                 ret = PTR_ERR(ide_port_class);
1626                 goto out_port_class;
1627         }
1628         ide_port_class->dev_release = ide_port_class_release;
1629
1630         init_ide_data();
1631
1632         proc_ide_create();
1633
1634         return 0;
1635
1636 out_port_class:
1637         bus_unregister(&ide_bus_type);
1638
1639         return ret;
1640 }
1641
1642 #ifdef MODULE
1643 static char *options = NULL;
1644 module_param(options, charp, 0);
1645 MODULE_LICENSE("GPL");
1646
1647 static void __init parse_options (char *line)
1648 {
1649         char *next = line;
1650
1651         if (line == NULL || !*line)
1652                 return;
1653         while ((line = next) != NULL) {
1654                 if ((next = strchr(line,' ')) != NULL)
1655                         *next++ = 0;
1656                 if (!ide_setup(line))
1657                         printk (KERN_INFO "Unknown option '%s'\n", line);
1658         }
1659 }
1660
1661 int __init init_module (void)
1662 {
1663         parse_options(options);
1664         return ide_init();
1665 }
1666
1667 void __exit cleanup_module (void)
1668 {
1669         int index;
1670
1671         for (index = 0; index < MAX_HWIFS; ++index)
1672                 ide_unregister(index, 0, 0);
1673
1674         proc_ide_destroy();
1675
1676         class_destroy(ide_port_class);
1677
1678         bus_unregister(&ide_bus_type);
1679 }
1680
1681 #else /* !MODULE */
1682
1683 __setup("", ide_setup);
1684
1685 module_init(ide_init);
1686
1687 #endif /* MODULE */