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