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