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