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 /* Called with ide_lock held. */
 494 static void ide_port_unregister_devices(ide_hwif_t *hwif)
 495 {
 496         int i;
 497
 498         for (i = 0; i < MAX_DRIVES; i++) {
 499                 ide_drive_t *drive = &hwif->drives[i];
 500
 501                 if (drive->present) {
 502                         spin_unlock_irq(&ide_lock);
 503                         device_unregister(&drive->gendev);
 504                         wait_for_completion(&drive->gendev_rel_comp);
 505                         spin_lock_irq(&ide_lock);
 506                 }
 507         }
 508 }
 509
 510 /**
 511  *      ide_unregister          -       free an IDE interface
 512  *      @index: index of interface (will change soon to a pointer)
 513  *      @init_default: init default hwif flag
 514  *      @restore: restore hwif flag
 515  *
 516  *      Perform the final unregister of an IDE interface. At the moment
 517  *      we don't refcount interfaces so this will also get split up.
 518  *
 519  *      Locking:
 520  *      The caller must not hold the IDE locks
 521  *      The drive present/vanishing is not yet properly locked
 522  *      Take care with the callbacks. These have been split to avoid
 523  *      deadlocking the IDE layer. The shutdown callback is called
 524  *      before we take the lock and free resources. It is up to the
 525  *      caller to be sure there is no pending I/O here, and that
 526  *      the interface will not be reopened (present/vanishing locking
 527  *      isn't yet done BTW). After we commit to the final kill we
 528  *      call the cleanup callback with the ide locks held.
 529  *
 530  *      Unregister restores the hwif structures to the default state.
 531  *      This is raving bonkers.
 532  */
 533
 534 void ide_unregister(unsigned int index, int init_default, int restore)
 535 {
 536         ide_hwif_t *hwif, *g;
 537         static ide_hwif_t tmp_hwif; /* protected by ide_cfg_mtx */
 538         ide_hwgroup_t *hwgroup;
 539         int irq_count = 0;
 540
 541         BUG_ON(index >= MAX_HWIFS);
 542
 543         BUG_ON(in_interrupt());
 544         BUG_ON(irqs_disabled());
 545         mutex_lock(&ide_cfg_mtx);
 546         spin_lock_irq(&ide_lock);
 547         hwif = &ide_hwifs[index];
 548         if (!hwif->present)
 549                 goto abort;
 550         ide_port_unregister_devices(hwif);
 551         hwif->present = 0;
 552
 553         spin_unlock_irq(&ide_lock);
 554
 555         ide_proc_unregister_port(hwif);
 556
 557         hwgroup = hwif->hwgroup;
 558         /*
 559          * free the irq if we were the only hwif using it
 560          */
 561         g = hwgroup->hwif;
 562         do {
 563                 if (g->irq == hwif->irq)
 564                         ++irq_count;
 565                 g = g->next;
 566         } while (g != hwgroup->hwif);
 567         if (irq_count == 1)
 568                 free_irq(hwif->irq, hwgroup);
 569
 570         ide_remove_port_from_hwgroup(hwif);
 571
 572         device_unregister(&hwif->gendev);
 573         wait_for_completion(&hwif->gendev_rel_comp);
 574
 575         /*
 576          * Remove us from the kernel's knowledge
 577          */
 578         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 579         kfree(hwif->sg_table);
 580         unregister_blkdev(hwif->major, hwif->name);
 581         spin_lock_irq(&ide_lock);
 582
 583         if (hwif->dma_base) {
 584                 (void) ide_release_dma(hwif);
 585
 586                 hwif->dma_base = 0;
 587                 hwif->dma_command = 0;
 588                 hwif->dma_vendor1 = 0;
 589                 hwif->dma_status = 0;
 590                 hwif->dma_vendor3 = 0;
 591                 hwif->dma_prdtable = 0;
 592
 593                 hwif->extra_base  = 0;
 594                 hwif->extra_ports = 0;
 595         }
 596
 597         ide_hwif_release_regions(hwif);
 598
 599         /* copy original settings */
 600         tmp_hwif = *hwif;
 601
 602         /* restore hwif data to pristine status */
 603         ide_init_port_data(hwif, index);
 604
 605         if (init_default)
 606                 init_hwif_default(hwif, index);
 607
 608         if (restore)
 609                 ide_hwif_restore(hwif, &tmp_hwif);
 610
 611 abort:
 612         spin_unlock_irq(&ide_lock);
 613         mutex_unlock(&ide_cfg_mtx);
 614 }
 615
 616 EXPORT_SYMBOL(ide_unregister);
 617
 618 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
 619 {
 620         memcpy(hwif->io_ports, hw->io_ports, sizeof(hwif->io_ports));
 621         hwif->irq = hw->irq;
 622         hwif->noprobe = 0;
 623         hwif->chipset = hw->chipset;
 624         hwif->gendev.parent = hw->dev;
 625         hwif->ack_intr = hw->ack_intr;
 626 }
 627 EXPORT_SYMBOL_GPL(ide_init_port_hw);
 628
 629 /**
 630  *      ide_register_hw         -       register IDE interface
 631  *      @hw: hardware registers
 632  *      @quirkproc: quirkproc function
 633  *      @hwifp: pointer to returned hwif
 634  *
 635  *      Register an IDE interface, specifying exactly the registers etc.
 636  *
 637  *      Returns -1 on error.
 638  */
 639
 640 int ide_register_hw(hw_regs_t *hw, void (*quirkproc)(ide_drive_t *),
 641                     ide_hwif_t **hwifp)
 642 {
 643         int index, retry = 1;
 644         ide_hwif_t *hwif;
 645         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
 646
 647         do {
 648                 hwif = ide_find_port(hw->io_ports[IDE_DATA_OFFSET]);
 649                 if (hwif)
 650                         goto found;
 651                 for (index = 0; index < MAX_HWIFS; index++)
 652                         ide_unregister(index, 1, 1);
 653         } while (retry--);
 654         return -1;
 655 found:
 656         index = hwif->index;
 657         if (hwif->present)
 658                 ide_unregister(index, 0, 1);
 659         else if (!hwif->hold)
 660                 ide_init_port_data(hwif, index);
 661
 662         ide_init_port_hw(hwif, hw);
 663         hwif->quirkproc = quirkproc;
 664
 665         idx[0] = index;
 666
 667         ide_device_add(idx, NULL);
 668
 669         if (hwifp)
 670                 *hwifp = hwif;
 671
 672         return hwif->present ? index : -1;
 673 }
 674
 675 EXPORT_SYMBOL(ide_register_hw);
 676
 677 /*
 678  *      Locks for IDE setting functionality
 679  */
 680
 681 DEFINE_MUTEX(ide_setting_mtx);
 682
 683 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 684
 685 /**
 686  *      ide_spin_wait_hwgroup   -       wait for group
 687  *      @drive: drive in the group
 688  *
 689  *      Wait for an IDE device group to go non busy and then return
 690  *      holding the ide_lock which guards the hwgroup->busy status
 691  *      and right to use it.
 692  */
 693
 694 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 695 {
 696         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 697         unsigned long timeout = jiffies + (3 * HZ);
 698
 699         spin_lock_irq(&ide_lock);
 700
 701         while (hwgroup->busy) {
 702                 unsigned long lflags;
 703                 spin_unlock_irq(&ide_lock);
 704                 local_irq_set(lflags);
 705                 if (time_after(jiffies, timeout)) {
 706                         local_irq_restore(lflags);
 707                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 708                         return -EBUSY;
 709                 }
 710                 local_irq_restore(lflags);
 711                 spin_lock_irq(&ide_lock);
 712         }
 713         return 0;
 714 }
 715
 716 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 717
 718 int set_io_32bit(ide_drive_t *drive, int arg)
 719 {
 720         if (drive->no_io_32bit)
 721                 return -EPERM;
 722
 723         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 724                 return -EINVAL;
 725
 726         if (ide_spin_wait_hwgroup(drive))
 727                 return -EBUSY;
 728
 729         drive->io_32bit = arg;
 730
 731         spin_unlock_irq(&ide_lock);
 732
 733         return 0;
 734 }
 735
 736 static int set_ksettings(ide_drive_t *drive, int arg)
 737 {
 738         if (arg < 0 || arg > 1)
 739                 return -EINVAL;
 740
 741         if (ide_spin_wait_hwgroup(drive))
 742                 return -EBUSY;
 743         drive->keep_settings = arg;
 744         spin_unlock_irq(&ide_lock);
 745
 746         return 0;
 747 }
 748
 749 int set_using_dma(ide_drive_t *drive, int arg)
 750 {
 751 #ifdef CONFIG_BLK_DEV_IDEDMA
 752         ide_hwif_t *hwif = drive->hwif;
 753         int err = -EPERM;
 754
 755         if (arg < 0 || arg > 1)
 756                 return -EINVAL;
 757
 758         if (!drive->id || !(drive->id->capability & 1))
 759                 goto out;
 760
 761         if (hwif->dma_host_set == NULL)
 762                 goto out;
 763
 764         err = -EBUSY;
 765         if (ide_spin_wait_hwgroup(drive))
 766                 goto out;
 767         /*
 768          * set ->busy flag, unlock and let it ride
 769          */
 770         hwif->hwgroup->busy = 1;
 771         spin_unlock_irq(&ide_lock);
 772
 773         err = 0;
 774
 775         if (arg) {
 776                 if (ide_set_dma(drive))
 777                         err = -EIO;
 778         } else
 779                 ide_dma_off(drive);
 780
 781         /*
 782          * lock, clear ->busy flag and unlock before leaving
 783          */
 784         spin_lock_irq(&ide_lock);
 785         hwif->hwgroup->busy = 0;
 786         spin_unlock_irq(&ide_lock);
 787 out:
 788         return err;
 789 #else
 790         if (arg < 0 || arg > 1)
 791                 return -EINVAL;
 792
 793         return -EPERM;
 794 #endif
 795 }
 796
 797 int set_pio_mode(ide_drive_t *drive, int arg)
 798 {
 799         struct request rq;
 800
 801         if (arg < 0 || arg > 255)
 802                 return -EINVAL;
 803
 804         if (drive->hwif->set_pio_mode == NULL)
 805                 return -ENOSYS;
 806
 807         if (drive->special.b.set_tune)
 808                 return -EBUSY;
 809
 810         ide_init_drive_cmd(&rq);
 811         rq.cmd_type = REQ_TYPE_ATA_TASKFILE;
 812
 813         drive->tune_req = (u8) arg;
 814         drive->special.b.set_tune = 1;
 815         (void) ide_do_drive_cmd(drive, &rq, ide_wait);
 816         return 0;
 817 }
 818
 819 static int set_unmaskirq(ide_drive_t *drive, int arg)
 820 {
 821         if (drive->no_unmask)
 822                 return -EPERM;
 823
 824         if (arg < 0 || arg > 1)
 825                 return -EINVAL;
 826
 827         if (ide_spin_wait_hwgroup(drive))
 828                 return -EBUSY;
 829         drive->unmask = arg;
 830         spin_unlock_irq(&ide_lock);
 831
 832         return 0;
 833 }
 834
 835 /**
 836  *      system_bus_clock        -       clock guess
 837  *
 838  *      External version of the bus clock guess used by very old IDE drivers
 839  *      for things like VLB timings. Should not be used.
 840  */
 841
 842 int system_bus_clock (void)
 843 {
 844         return system_bus_speed;
 845 }
 846
 847 EXPORT_SYMBOL(system_bus_clock);
 848
 849 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 850 {
 851         ide_drive_t *drive = dev->driver_data;
 852         ide_hwif_t *hwif = HWIF(drive);
 853         struct request rq;
 854         struct request_pm_state rqpm;
 855         ide_task_t args;
 856         int ret;
 857
 858         /* Call ACPI _GTM only once */
 859         if (!(drive->dn % 2))
 860                 ide_acpi_get_timing(hwif);
 861
 862         memset(&rq, 0, sizeof(rq));
 863         memset(&rqpm, 0, sizeof(rqpm));
 864         memset(&args, 0, sizeof(args));
 865         rq.cmd_type = REQ_TYPE_PM_SUSPEND;
 866         rq.special = &args;
 867         rq.data = &rqpm;
 868         rqpm.pm_step = ide_pm_state_start_suspend;
 869         if (mesg.event == PM_EVENT_PRETHAW)
 870                 mesg.event = PM_EVENT_FREEZE;
 871         rqpm.pm_state = mesg.event;
 872
 873         ret = ide_do_drive_cmd(drive, &rq, ide_wait);
 874         /* only call ACPI _PS3 after both drivers are suspended */
 875         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 876                  && hwif->drives[1].present)
 877                  || !hwif->drives[0].present
 878                  || !hwif->drives[1].present))
 879                 ide_acpi_set_state(hwif, 0);
 880         return ret;
 881 }
 882
 883 static int generic_ide_resume(struct device *dev)
 884 {
 885         ide_drive_t *drive = dev->driver_data;
 886         ide_hwif_t *hwif = HWIF(drive);
 887         struct request rq;
 888         struct request_pm_state rqpm;
 889         ide_task_t args;
 890         int err;
 891
 892         /* Call ACPI _STM only once */
 893         if (!(drive->dn % 2)) {
 894                 ide_acpi_set_state(hwif, 1);
 895                 ide_acpi_push_timing(hwif);
 896         }
 897
 898         ide_acpi_exec_tfs(drive);
 899
 900         memset(&rq, 0, sizeof(rq));
 901         memset(&rqpm, 0, sizeof(rqpm));
 902         memset(&args, 0, sizeof(args));
 903         rq.cmd_type = REQ_TYPE_PM_RESUME;
 904         rq.special = &args;
 905         rq.data = &rqpm;
 906         rqpm.pm_step = ide_pm_state_start_resume;
 907         rqpm.pm_state = PM_EVENT_ON;
 908
 909         err = ide_do_drive_cmd(drive, &rq, ide_head_wait);
 910
 911         if (err == 0 && dev->driver) {
 912                 ide_driver_t *drv = to_ide_driver(dev->driver);
 913
 914                 if (drv->resume)
 915                         drv->resume(drive);
 916         }
 917
 918         return err;
 919 }
 920
 921 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 922                         unsigned int cmd, unsigned long arg)
 923 {
 924         unsigned long flags;
 925         ide_driver_t *drv;
 926         void __user *p = (void __user *)arg;
 927         int err = 0, (*setfunc)(ide_drive_t *, int);
 928         u8 *val;
 929
 930         switch (cmd) {
 931         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
 932         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
 933         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
 934         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
 935         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
 936         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
 937         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
 938         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
 939         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
 940         }
 941
 942         switch (cmd) {
 943                 case HDIO_OBSOLETE_IDENTITY:
 944                 case HDIO_GET_IDENTITY:
 945                         if (bdev != bdev->bd_contains)
 946                                 return -EINVAL;
 947                         if (drive->id_read == 0)
 948                                 return -ENOMSG;
 949                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
 950                                 return -EFAULT;
 951                         return 0;
 952
 953                 case HDIO_GET_NICE:
 954                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
 955                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
 956                                         drive->nice1 << IDE_NICE_1,
 957                                         (long __user *) arg);
 958 #ifdef CONFIG_IDE_TASK_IOCTL
 959                 case HDIO_DRIVE_TASKFILE:
 960                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 961                                 return -EACCES;
 962                         switch(drive->media) {
 963                                 case ide_disk:
 964                                         return ide_taskfile_ioctl(drive, cmd, arg);
 965                                 default:
 966                                         return -ENOMSG;
 967                         }
 968 #endif /* CONFIG_IDE_TASK_IOCTL */
 969
 970                 case HDIO_DRIVE_CMD:
 971                         if (!capable(CAP_SYS_RAWIO))
 972                                 return -EACCES;
 973                         return ide_cmd_ioctl(drive, cmd, arg);
 974
 975                 case HDIO_DRIVE_TASK:
 976                         if (!capable(CAP_SYS_RAWIO))
 977                                 return -EACCES;
 978                         return ide_task_ioctl(drive, cmd, arg);
 979
 980                 case HDIO_SCAN_HWIF:
 981                 {
 982                         hw_regs_t hw;
 983                         int args[3];
 984                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
 985                         if (copy_from_user(args, p, 3 * sizeof(int)))
 986                                 return -EFAULT;
 987                         memset(&hw, 0, sizeof(hw));
 988                         ide_init_hwif_ports(&hw, (unsigned long) args[0],
 989                                             (unsigned long) args[1], NULL);
 990                         hw.irq = args[2];
 991                         if (ide_register_hw(&hw, NULL, NULL) == -1)
 992                                 return -EIO;
 993                         return 0;
 994                 }
 995                 case HDIO_UNREGISTER_HWIF:
 996                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
 997                         /* (arg > MAX_HWIFS) checked in function */
 998                         ide_unregister(arg, 1, 1);
 999                         return 0;
1000                 case HDIO_SET_NICE:
1001                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1002                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
1003                                 return -EPERM;
1004                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
1005                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
1006                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
1007                                 drive->dsc_overlap = 0;
1008                                 return -EPERM;
1009                         }
1010                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
1011                         return 0;
1012                 case HDIO_DRIVE_RESET:
1013                         if (!capable(CAP_SYS_ADMIN))
1014                                 return -EACCES;
1015
1016                         /*
1017                          *      Abort the current command on the
1018                          *      group if there is one, taking
1019                          *      care not to allow anything else
1020                          *      to be queued and to die on the
1021                          *      spot if we miss one somehow
1022                          */
1023
1024                         spin_lock_irqsave(&ide_lock, flags);
1025
1026                         if (HWGROUP(drive)->resetting) {
1027                                 spin_unlock_irqrestore(&ide_lock, flags);
1028                                 return -EBUSY;
1029                         }
1030
1031                         ide_abort(drive, "drive reset");
1032
1033                         BUG_ON(HWGROUP(drive)->handler);
1034
1035                         /* Ensure nothing gets queued after we
1036                            drop the lock. Reset will clear the busy */
1037
1038                         HWGROUP(drive)->busy = 1;
1039                         spin_unlock_irqrestore(&ide_lock, flags);
1040                         (void) ide_do_reset(drive);
1041
1042                         return 0;
1043                 case HDIO_GET_BUSSTATE:
1044                         if (!capable(CAP_SYS_ADMIN))
1045                                 return -EACCES;
1046                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
1047                                 return -EFAULT;
1048                         return 0;
1049
1050                 case HDIO_SET_BUSSTATE:
1051                         if (!capable(CAP_SYS_ADMIN))
1052                                 return -EACCES;
1053                         if (HWIF(drive)->busproc)
1054                                 return HWIF(drive)->busproc(drive, (int)arg);
1055                         return -EOPNOTSUPP;
1056                 default:
1057                         return -EINVAL;
1058         }
1059
1060 read_val:
1061         mutex_lock(&ide_setting_mtx);
1062         spin_lock_irqsave(&ide_lock, flags);
1063         err = *val;
1064         spin_unlock_irqrestore(&ide_lock, flags);
1065         mutex_unlock(&ide_setting_mtx);
1066         return err >= 0 ? put_user(err, (long __user *)arg) : err;
1067
1068 set_val:
1069         if (bdev != bdev->bd_contains)
1070                 err = -EINVAL;
1071         else {
1072                 if (!capable(CAP_SYS_ADMIN))
1073                         err = -EACCES;
1074                 else {
1075                         mutex_lock(&ide_setting_mtx);
1076                         err = setfunc(drive, arg);
1077                         mutex_unlock(&ide_setting_mtx);
1078                 }
1079         }
1080         return err;
1081 }
1082
1083 EXPORT_SYMBOL(generic_ide_ioctl);
1084
1085 /*
1086  * stridx() returns the offset of c within s,
1087  * or -1 if c is '\0' or not found within s.
1088  */
1089 static int __init stridx (const char *s, char c)
1090 {
1091         char *i = strchr(s, c);
1092         return (i && c) ? i - s : -1;
1093 }
1094
1095 /*
1096  * match_parm() does parsing for ide_setup():
1097  *
1098  * 1. the first char of s must be '='.
1099  * 2. if the remainder matches one of the supplied keywords,
1100  *     the index (1 based) of the keyword is negated and returned.
1101  * 3. if the remainder is a series of no more than max_vals numbers
1102  *     separated by commas, the numbers are saved in vals[] and a
1103  *     count of how many were saved is returned.  Base10 is assumed,
1104  *     and base16 is allowed when prefixed with "0x".
1105  * 4. otherwise, zero is returned.
1106  */
1107 static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
1108 {
1109         static const char *decimal = "0123456789";
1110         static const char *hex = "0123456789abcdef";
1111         int i, n;
1112
1113         if (*s++ == '=') {
1114                 /*
1115                  * Try matching against the supplied keywords,
1116                  * and return -(index+1) if we match one
1117                  */
1118                 if (keywords != NULL) {
1119                         for (i = 0; *keywords != NULL; ++i) {
1120                                 if (!strcmp(s, *keywords++))
1121                                         return -(i+1);
1122                         }
1123                 }
1124                 /*
1125                  * Look for a series of no more than "max_vals"
1126                  * numeric values separated by commas, in base10,
1127                  * or base16 when prefixed with "0x".
1128                  * Return a count of how many were found.
1129                  */
1130                 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
1131                         vals[n] = i;
1132                         while ((i = stridx(decimal, *++s)) >= 0)
1133                                 vals[n] = (vals[n] * 10) + i;
1134                         if (*s == 'x' && !vals[n]) {
1135                                 while ((i = stridx(hex, *++s)) >= 0)
1136                                         vals[n] = (vals[n] * 0x10) + i;
1137                         }
1138                         if (++n == max_vals)
1139                                 break;
1140                         if (*s == ',' || *s == ';')
1141                                 ++s;
1142                 }
1143                 if (!*s)
1144                         return n;
1145         }
1146         return 0;       /* zero = nothing matched */
1147 }
1148
1149 extern int probe_ali14xx;
1150 extern int probe_umc8672;
1151 extern int probe_dtc2278;
1152 extern int probe_ht6560b;
1153 extern int probe_qd65xx;
1154 extern int cmd640_vlb;
1155
1156 static int __initdata is_chipset_set[MAX_HWIFS];
1157
1158 /*
1159  * ide_setup() gets called VERY EARLY during initialization,
1160  * to handle kernel "command line" strings beginning with "hdx=" or "ide".
1161  *
1162  * Remember to update Documentation/ide/ide.txt if you change something here.
1163  */
1164 static int __init ide_setup(char *s)
1165 {
1166         int i, vals[3];
1167         ide_hwif_t *hwif;
1168         ide_drive_t *drive;
1169         unsigned int hw, unit;
1170         const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
1171         const char max_hwif  = '0' + (MAX_HWIFS - 1);
1172
1173
1174         if (strncmp(s,"hd",2) == 0 && s[2] == '=')      /* hd= is for hd.c   */
1175                 return 0;                               /* driver and not us */
1176
1177         if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
1178                 return 0;
1179
1180         printk(KERN_INFO "ide_setup: %s", s);
1181         init_ide_data ();
1182
1183 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
1184         if (!strcmp(s, "ide=doubler")) {
1185                 extern int ide_doubler;
1186
1187                 printk(" : Enabled support for IDE doublers\n");
1188                 ide_doubler = 1;
1189                 return 1;
1190         }
1191 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
1192
1193         if (!strcmp(s, "ide=nodma")) {
1194                 printk(" : Prevented DMA\n");
1195                 noautodma = 1;
1196                 goto obsolete_option;
1197         }
1198
1199 #ifdef CONFIG_BLK_DEV_IDEACPI
1200         if (!strcmp(s, "ide=noacpi")) {
1201                 //printk(" : Disable IDE ACPI support.\n");
1202                 ide_noacpi = 1;
1203                 return 1;
1204         }
1205         if (!strcmp(s, "ide=acpigtf")) {
1206                 //printk(" : Enable IDE ACPI _GTF support.\n");
1207                 ide_noacpitfs = 0;
1208                 return 1;
1209         }
1210         if (!strcmp(s, "ide=acpionboot")) {
1211                 //printk(" : Call IDE ACPI methods on boot.\n");
1212                 ide_noacpionboot = 0;
1213                 return 1;
1214         }
1215 #endif /* CONFIG_BLK_DEV_IDEACPI */
1216
1217         /*
1218          * Look for drive options:  "hdx="
1219          */
1220         if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
1221                 const char *hd_words[] = {
1222                         "none", "noprobe", "nowerr", "cdrom", "nodma",
1223                         "autotune", "noautotune", "-8", "-9", "-10",
1224                         "noflush", "remap", "remap63", "scsi", NULL };
1225                 unit = s[2] - 'a';
1226                 hw   = unit / MAX_DRIVES;
1227                 unit = unit % MAX_DRIVES;
1228                 hwif = &ide_hwifs[hw];
1229                 drive = &hwif->drives[unit];
1230                 if (strncmp(s + 4, "ide-", 4) == 0) {
1231                         strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
1232                         goto obsolete_option;
1233                 }
1234                 switch (match_parm(&s[3], hd_words, vals, 3)) {
1235                         case -1: /* "none" */
1236                         case -2: /* "noprobe" */
1237                                 drive->noprobe = 1;
1238                                 goto done;
1239                         case -3: /* "nowerr" */
1240                                 drive->bad_wstat = BAD_R_STAT;
1241                                 hwif->noprobe = 0;
1242                                 goto done;
1243                         case -4: /* "cdrom" */
1244                                 drive->present = 1;
1245                                 drive->media = ide_cdrom;
1246                                 /* an ATAPI device ignores DRDY */
1247                                 drive->ready_stat = 0;
1248                                 hwif->noprobe = 0;
1249                                 goto done;
1250                         case -5: /* nodma */
1251                                 drive->nodma = 1;
1252                                 goto done;
1253                         case -6: /* "autotune" */
1254                                 drive->autotune = IDE_TUNE_AUTO;
1255                                 goto obsolete_option;
1256                         case -7: /* "noautotune" */
1257                                 drive->autotune = IDE_TUNE_NOAUTO;
1258                                 goto obsolete_option;
1259                         case -11: /* noflush */
1260                                 drive->noflush = 1;
1261                                 goto done;
1262                         case -12: /* "remap" */
1263                                 drive->remap_0_to_1 = 1;
1264                                 goto obsolete_option;
1265                         case -13: /* "remap63" */
1266                                 drive->sect0 = 63;
1267                                 goto obsolete_option;
1268                         case -14: /* "scsi" */
1269                                 drive->scsi = 1;
1270                                 goto obsolete_option;
1271                         case 3: /* cyl,head,sect */
1272                                 drive->media    = ide_disk;
1273                                 drive->ready_stat = READY_STAT;
1274                                 drive->cyl      = drive->bios_cyl  = vals[0];
1275                                 drive->head     = drive->bios_head = vals[1];
1276                                 drive->sect     = drive->bios_sect = vals[2];
1277                                 drive->present  = 1;
1278                                 drive->forced_geom = 1;
1279                                 hwif->noprobe = 0;
1280                                 goto done;
1281                         default:
1282                                 goto bad_option;
1283                 }
1284         }
1285
1286         if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
1287                 goto bad_option;
1288         /*
1289          * Look for bus speed option:  "idebus="
1290          */
1291         if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
1292                 if (match_parm(&s[6], NULL, vals, 1) != 1)
1293                         goto bad_option;
1294                 if (vals[0] >= 20 && vals[0] <= 66) {
1295                         idebus_parameter = vals[0];
1296                 } else
1297                         printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
1298                 goto done;
1299         }
1300         /*
1301          * Look for interface options:  "idex="
1302          */
1303         if (s[3] >= '0' && s[3] <= max_hwif) {
1304                 /*
1305                  * Be VERY CAREFUL changing this: note hardcoded indexes below
1306                  * (-8, -9, -10) are reserved to ease the hardcoding.
1307                  */
1308                 static const char *ide_words[] = {
1309                         "noprobe", "serialize", "minus3", "minus4",
1310                         "reset", "minus6", "ata66", "minus8", "minus9",
1311                         "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
1312                         "dtc2278", "umc8672", "ali14xx", NULL };
1313
1314                 hw_regs_t hwregs;
1315
1316                 hw = s[3] - '0';
1317                 hwif = &ide_hwifs[hw];
1318                 i = match_parm(&s[4], ide_words, vals, 3);
1319
1320                 /*
1321                  * Cryptic check to ensure chipset not already set for hwif.
1322                  * Note: we can't depend on hwif->chipset here.
1323                  */
1324                 if ((i >= -18 && i <= -11) || (i > 0 && i <= 3)) {
1325                         /* chipset already specified */
1326                         if (is_chipset_set[hw])
1327                                 goto bad_option;
1328                         if (i > -18 && i <= -11) {
1329                                 /* these drivers are for "ide0=" only */
1330                                 if (hw != 0)
1331                                         goto bad_hwif;
1332                                 /* chipset already specified for 2nd port */
1333                                 if (is_chipset_set[hw+1])
1334                                         goto bad_option;
1335                         }
1336                         is_chipset_set[hw] = 1;
1337                         printk("\n");
1338                 }
1339
1340                 switch (i) {
1341 #ifdef CONFIG_BLK_DEV_ALI14XX
1342                         case -17: /* "ali14xx" */
1343                                 probe_ali14xx = 1;
1344                                 goto obsolete_option;
1345 #endif
1346 #ifdef CONFIG_BLK_DEV_UMC8672
1347                         case -16: /* "umc8672" */
1348                                 probe_umc8672 = 1;
1349                                 goto obsolete_option;
1350 #endif
1351 #ifdef CONFIG_BLK_DEV_DTC2278
1352                         case -15: /* "dtc2278" */
1353                                 probe_dtc2278 = 1;
1354                                 goto obsolete_option;
1355 #endif
1356 #ifdef CONFIG_BLK_DEV_CMD640
1357                         case -14: /* "cmd640_vlb" */
1358                                 cmd640_vlb = 1;
1359                                 goto obsolete_option;
1360 #endif
1361 #ifdef CONFIG_BLK_DEV_HT6560B
1362                         case -13: /* "ht6560b" */
1363                                 probe_ht6560b = 1;
1364                                 goto obsolete_option;
1365 #endif
1366 #ifdef CONFIG_BLK_DEV_QD65XX
1367                         case -12: /* "qd65xx" */
1368                                 probe_qd65xx = 1;
1369                                 goto obsolete_option;
1370 #endif
1371 #ifdef CONFIG_BLK_DEV_4DRIVES
1372                         case -11: /* "four" drives on one set of ports */
1373                         {
1374                                 ide_hwif_t *mate = &ide_hwifs[hw^1];
1375                                 mate->drives[0].select.all ^= 0x20;
1376                                 mate->drives[1].select.all ^= 0x20;
1377                                 hwif->chipset = mate->chipset = ide_4drives;
1378                                 mate->irq = hwif->irq;
1379                                 memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
1380                                 hwif->mate = mate;
1381                                 mate->mate = hwif;
1382                                 hwif->serialized = mate->serialized = 1;
1383                                 goto obsolete_option;
1384                         }
1385 #endif /* CONFIG_BLK_DEV_4DRIVES */
1386                         case -10: /* minus10 */
1387                         case -9: /* minus9 */
1388                         case -8: /* minus8 */
1389                         case -6:
1390                         case -4:
1391                         case -3:
1392                                 goto bad_option;
1393                         case -7: /* ata66 */
1394 #ifdef CONFIG_BLK_DEV_IDEPCI
1395                                 /*
1396                                  * Use ATA_CBL_PATA40_SHORT so drive side
1397                                  * cable detection is also overriden.
1398                                  */
1399                                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1400                                 goto obsolete_option;
1401 #else
1402                                 goto bad_hwif;
1403 #endif
1404                         case -5: /* "reset" */
1405                                 hwif->reset = 1;
1406                                 goto obsolete_option;
1407                         case -2: /* "serialize" */
1408                                 hwif->mate = &ide_hwifs[hw^1];
1409                                 hwif->mate->mate = hwif;
1410                                 hwif->serialized = hwif->mate->serialized = 1;
1411                                 goto obsolete_option;
1412
1413                         case -1: /* "noprobe" */
1414                                 hwif->noprobe = 1;
1415                                 goto obsolete_option;
1416
1417                         case 1: /* base */
1418                                 vals[1] = vals[0] + 0x206; /* default ctl */
1419                         case 2: /* base,ctl */
1420                                 vals[2] = 0;    /* default irq = probe for it */
1421                         case 3: /* base,ctl,irq */
1422                                 memset(&hwregs, 0, sizeof(hwregs));
1423                                 ide_init_hwif_ports(&hwregs, vals[0], vals[1], &hwif->irq);
1424                                 memcpy(hwif->io_ports, hwregs.io_ports, sizeof(hwif->io_ports));
1425                                 hwif->irq      = vals[2];
1426                                 hwif->noprobe  = 0;
1427                                 hwif->chipset  = ide_forced;
1428                                 goto obsolete_option;
1429
1430                         case 0: goto bad_option;
1431                         default:
1432                                 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
1433                                 return 1;
1434                 }
1435         }
1436 bad_option:
1437         printk(" -- BAD OPTION\n");
1438         return 1;
1439 obsolete_option:
1440         printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
1441         return 1;
1442 bad_hwif:
1443         printk("-- NOT SUPPORTED ON ide%d", hw);
1444 done:
1445         printk("\n");
1446         return 1;
1447 }
1448
1449 EXPORT_SYMBOL(ide_lock);
1450
1451 static int ide_bus_match(struct device *dev, struct device_driver *drv)
1452 {
1453         return 1;
1454 }
1455
1456 static char *media_string(ide_drive_t *drive)
1457 {
1458         switch (drive->media) {
1459         case ide_disk:
1460                 return "disk";
1461         case ide_cdrom:
1462                 return "cdrom";
1463         case ide_tape:
1464                 return "tape";
1465         case ide_floppy:
1466                 return "floppy";
1467         case ide_optical:
1468                 return "optical";
1469         default:
1470                 return "UNKNOWN";
1471         }
1472 }
1473
1474 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
1475 {
1476         ide_drive_t *drive = to_ide_device(dev);
1477         return sprintf(buf, "%s\n", media_string(drive));
1478 }
1479
1480 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
1481 {
1482         ide_drive_t *drive = to_ide_device(dev);
1483         return sprintf(buf, "%s\n", drive->name);
1484 }
1485
1486 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1487 {
1488         ide_drive_t *drive = to_ide_device(dev);
1489         return sprintf(buf, "ide:m-%s\n", media_string(drive));
1490 }
1491
1492 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
1493                           char *buf)
1494 {
1495         ide_drive_t *drive = to_ide_device(dev);
1496         return sprintf(buf, "%s\n", drive->id->model);
1497 }
1498
1499 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
1500                              char *buf)
1501 {
1502         ide_drive_t *drive = to_ide_device(dev);
1503         return sprintf(buf, "%s\n", drive->id->fw_rev);
1504 }
1505
1506 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
1507                            char *buf)
1508 {
1509         ide_drive_t *drive = to_ide_device(dev);
1510         return sprintf(buf, "%s\n", drive->id->serial_no);
1511 }
1512
1513 static struct device_attribute ide_dev_attrs[] = {
1514         __ATTR_RO(media),
1515         __ATTR_RO(drivename),
1516         __ATTR_RO(modalias),
1517         __ATTR_RO(model),
1518         __ATTR_RO(firmware),
1519         __ATTR(serial, 0400, serial_show, NULL),
1520         __ATTR_NULL
1521 };
1522
1523 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
1524 {
1525         ide_drive_t *drive = to_ide_device(dev);
1526
1527         add_uevent_var(env, "MEDIA=%s", media_string(drive));
1528         add_uevent_var(env, "DRIVENAME=%s", drive->name);
1529         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
1530         return 0;
1531 }
1532
1533 static int generic_ide_probe(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         return drv->probe ? drv->probe(drive) : -ENODEV;
1539 }
1540
1541 static int generic_ide_remove(struct device *dev)
1542 {
1543         ide_drive_t *drive = to_ide_device(dev);
1544         ide_driver_t *drv = to_ide_driver(dev->driver);
1545
1546         if (drv->remove)
1547                 drv->remove(drive);
1548
1549         return 0;
1550 }
1551
1552 static void generic_ide_shutdown(struct device *dev)
1553 {
1554         ide_drive_t *drive = to_ide_device(dev);
1555         ide_driver_t *drv = to_ide_driver(dev->driver);
1556
1557         if (dev->driver && drv->shutdown)
1558                 drv->shutdown(drive);
1559 }
1560
1561 struct bus_type ide_bus_type = {
1562         .name           = "ide",
1563         .match          = ide_bus_match,
1564         .uevent         = ide_uevent,
1565         .probe          = generic_ide_probe,
1566         .remove         = generic_ide_remove,
1567         .shutdown       = generic_ide_shutdown,
1568         .dev_attrs      = ide_dev_attrs,
1569         .suspend        = generic_ide_suspend,
1570         .resume         = generic_ide_resume,
1571 };
1572
1573 EXPORT_SYMBOL_GPL(ide_bus_type);
1574
1575 /*
1576  * This is gets invoked once during initialization, to set *everything* up
1577  */
1578 static int __init ide_init(void)
1579 {
1580         int ret;
1581
1582         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
1583         system_bus_speed = ide_system_bus_speed();
1584
1585         printk(KERN_INFO "ide: Assuming %dMHz system bus speed "
1586                          "for PIO modes%s\n", system_bus_speed,
1587                         idebus_parameter ? "" : "; override with idebus=xx");
1588
1589         ret = bus_register(&ide_bus_type);
1590         if (ret < 0) {
1591                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1592                 return ret;
1593         }
1594
1595         init_ide_data();
1596
1597         proc_ide_create();
1598
1599         return 0;
1600 }
1601
1602 #ifdef MODULE
1603 static char *options = NULL;
1604 module_param(options, charp, 0);
1605 MODULE_LICENSE("GPL");
1606
1607 static void __init parse_options (char *line)
1608 {
1609         char *next = line;
1610
1611         if (line == NULL || !*line)
1612                 return;
1613         while ((line = next) != NULL) {
1614                 if ((next = strchr(line,' ')) != NULL)
1615                         *next++ = 0;
1616                 if (!ide_setup(line))
1617                         printk (KERN_INFO "Unknown option '%s'\n", line);
1618         }
1619 }
1620
1621 int __init init_module (void)
1622 {
1623         parse_options(options);
1624         return ide_init();
1625 }
1626
1627 void __exit cleanup_module (void)
1628 {
1629         int index;
1630
1631         for (index = 0; index < MAX_HWIFS; ++index)
1632                 ide_unregister(index, 0, 0);
1633
1634         proc_ide_destroy();
1635
1636         bus_unregister(&ide_bus_type);
1637 }
1638
1639 #else /* !MODULE */
1640
1641 __setup("", ide_setup);
1642
1643 module_init(ide_init);
1644
1645 #endif /* MODULE */