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 REVISION        "Revision: 7.00alpha2"
  48
  49 #define _IDE_C                  /* Tell ide.h it's really us */
  50
  51 #include <linux/module.h>
  52 #include <linux/types.h>
  53 #include <linux/string.h>
  54 #include <linux/kernel.h>
  55 #include <linux/timer.h>
  56 #include <linux/mm.h>
  57 #include <linux/interrupt.h>
  58 #include <linux/major.h>
  59 #include <linux/errno.h>
  60 #include <linux/genhd.h>
  61 #include <linux/blkpg.h>
  62 #include <linux/slab.h>
  63 #include <linux/init.h>
  64 #include <linux/pci.h>
  65 #include <linux/delay.h>
  66 #include <linux/ide.h>
  67 #include <linux/completion.h>
  68 #include <linux/reboot.h>
  69 #include <linux/cdrom.h>
  70 #include <linux/seq_file.h>
  71 #include <linux/device.h>
  72 #include <linux/bitops.h>
  73
  74 #include <asm/byteorder.h>
  75 #include <asm/irq.h>
  76 #include <asm/uaccess.h>
  77 #include <asm/io.h>
  78
  79
  80 /* default maximum number of failures */
  81 #define IDE_DEFAULT_MAX_FAILURES        1
  82
  83 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
  84                                         IDE2_MAJOR, IDE3_MAJOR,
  85                                         IDE4_MAJOR, IDE5_MAJOR,
  86                                         IDE6_MAJOR, IDE7_MAJOR,
  87                                         IDE8_MAJOR, IDE9_MAJOR };
  88
  89 static int idebus_parameter;    /* holds the "idebus=" parameter */
  90 static int system_bus_speed;    /* holds what we think is VESA/PCI bus speed */
  91
  92 DEFINE_MUTEX(ide_cfg_mtx);
  93  __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
  94
  95 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
  96 int ide_scan_direction; /* THIS was formerly 2.2.x pci=reverse */
  97 #endif
  98
  99 int noautodma = 0;
 100
 101 #ifdef CONFIG_BLK_DEV_IDEACPI
 102 int ide_noacpi = 0;
 103 int ide_noacpitfs = 1;
 104 int ide_noacpionboot = 1;
 105 #endif
 106
 107 /*
 108  * This is declared extern in ide.h, for access by other IDE modules:
 109  */
 110 ide_hwif_t ide_hwifs[MAX_HWIFS];        /* master data repository */
 111
 112 EXPORT_SYMBOL(ide_hwifs);
 113
 114 /*
 115  * Do not even *think* about calling this!
 116  */
 117 void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
 118 {
 119         unsigned int unit;
 120
 121         /* bulk initialize hwif & drive info with zeros */
 122         memset(hwif, 0, sizeof(ide_hwif_t));
 123
 124         /* fill in any non-zero initial values */
 125         hwif->index     = index;
 126         hwif->major     = ide_hwif_to_major[index];
 127
 128         hwif->name[0]   = 'i';
 129         hwif->name[1]   = 'd';
 130         hwif->name[2]   = 'e';
 131         hwif->name[3]   = '0' + index;
 132
 133         hwif->bus_state = BUSSTATE_ON;
 134
 135         init_completion(&hwif->gendev_rel_comp);
 136
 137         default_hwif_iops(hwif);
 138         default_hwif_transport(hwif);
 139         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 140                 ide_drive_t *drive = &hwif->drives[unit];
 141
 142                 drive->media                    = ide_disk;
 143                 drive->select.all               = (unit<<4)|0xa0;
 144                 drive->hwif                     = hwif;
 145                 drive->ctl                      = 0x08;
 146                 drive->ready_stat               = READY_STAT;
 147                 drive->bad_wstat                = BAD_W_STAT;
 148                 drive->special.b.recalibrate    = 1;
 149                 drive->special.b.set_geometry   = 1;
 150                 drive->name[0]                  = 'h';
 151                 drive->name[1]                  = 'd';
 152                 drive->name[2]                  = 'a' + (index * MAX_DRIVES) + unit;
 153                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
 154                 drive->using_dma                = 0;
 155                 drive->vdma                     = 0;
 156                 INIT_LIST_HEAD(&drive->list);
 157                 init_completion(&drive->gendev_rel_comp);
 158         }
 159 }
 160 EXPORT_SYMBOL_GPL(ide_init_port_data);
 161
 162 static void init_hwif_default(ide_hwif_t *hwif, unsigned int index)
 163 {
 164         hw_regs_t hw;
 165
 166         memset(&hw, 0, sizeof(hw_regs_t));
 167
 168         ide_init_hwif_ports(&hw, ide_default_io_base(index), 0, &hwif->irq);
 169
 170         memcpy(hwif->io_ports, hw.io_ports, sizeof(hw.io_ports));
 171
 172         hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
 173 #ifdef CONFIG_BLK_DEV_HD
 174         if (hwif->io_ports[IDE_DATA_OFFSET] == HD_DATA)
 175                 hwif->noprobe = 1;      /* may be overridden by ide_setup() */
 176 #endif
 177 }
 178
 179 /*
 180  * init_ide_data() sets reasonable default values into all fields
 181  * of all instances of the hwifs and drives, but only on the first call.
 182  * Subsequent calls have no effect (they don't wipe out anything).
 183  *
 184  * This routine is normally called at driver initialization time,
 185  * but may also be called MUCH earlier during kernel "command-line"
 186  * parameter processing.  As such, we cannot depend on any other parts
 187  * of the kernel (such as memory allocation) to be functioning yet.
 188  *
 189  * This is too bad, as otherwise we could dynamically allocate the
 190  * ide_drive_t structs as needed, rather than always consuming memory
 191  * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
 192  *
 193  * FIXME: We should stuff the setup data into __init and copy the
 194  * relevant hwifs/allocate them properly during boot.
 195  */
 196 #define MAGIC_COOKIE 0x12345678
 197 static void __init init_ide_data (void)
 198 {
 199         ide_hwif_t *hwif;
 200         unsigned int index;
 201         static unsigned long magic_cookie = MAGIC_COOKIE;
 202
 203         if (magic_cookie != MAGIC_COOKIE)
 204                 return;         /* already initialized */
 205         magic_cookie = 0;
 206
 207         /* Initialise all interface structures */
 208         for (index = 0; index < MAX_HWIFS; ++index) {
 209                 hwif = &ide_hwifs[index];
 210                 ide_init_port_data(hwif, index);
 211                 init_hwif_default(hwif, index);
 212 #if !defined(CONFIG_PPC32) || !defined(CONFIG_PCI)
 213                 hwif->irq =
 214                         ide_init_default_irq(hwif->io_ports[IDE_DATA_OFFSET]);
 215 #endif
 216         }
 217 }
 218
 219 /**
 220  *      ide_system_bus_speed    -       guess bus speed
 221  *
 222  *      ide_system_bus_speed() returns what we think is the system VESA/PCI
 223  *      bus speed (in MHz). This is used for calculating interface PIO timings.
 224  *      The default is 40 for known PCI systems, 50 otherwise.
 225  *      The "idebus=xx" parameter can be used to override this value.
 226  *      The actual value to be used is computed/displayed the first time
 227  *      through. Drivers should only use this as a last resort.
 228  *
 229  *      Returns a guessed speed in MHz.
 230  */
 231
 232 static int ide_system_bus_speed(void)
 233 {
 234 #ifdef CONFIG_PCI
 235         static struct pci_device_id pci_default[] = {
 236                 { PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID) },
 237                 { }
 238         };
 239 #else
 240 #define pci_default 0
 241 #endif /* CONFIG_PCI */
 242
 243         /* user supplied value */
 244         if (idebus_parameter)
 245                 return idebus_parameter;
 246
 247         /* safe default value for PCI or VESA and PCI*/
 248         return pci_dev_present(pci_default) ? 33 : 50;
 249 }
 250
 251 ide_hwif_t * ide_find_port(unsigned long base)
 252 {
 253         ide_hwif_t *hwif;
 254         int i;
 255
 256         for (i = 0; i < MAX_HWIFS; i++) {
 257                 hwif = &ide_hwifs[i];
 258                 if (hwif->io_ports[IDE_DATA_OFFSET] == base)
 259                         goto found;
 260         }
 261
 262         for (i = 0; i < MAX_HWIFS; i++) {
 263                 hwif = &ide_hwifs[i];
 264                 if (hwif->io_ports[IDE_DATA_OFFSET] == 0)
 265                         goto found;
 266         }
 267
 268         hwif = NULL;
 269 found:
 270         return hwif;
 271 }
 272
 273 EXPORT_SYMBOL_GPL(ide_find_port);
 274
 275 static struct resource* hwif_request_region(ide_hwif_t *hwif,
 276                                             unsigned long addr, int num)
 277 {
 278         struct resource *res = request_region(addr, num, hwif->name);
 279
 280         if (!res)
 281                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
 282                                 hwif->name, addr, addr+num-1);
 283         return res;
 284 }
 285
 286 /**
 287  *      ide_hwif_request_regions - request resources for IDE
 288  *      @hwif: interface to use
 289  *
 290  *      Requests all the needed resources for an interface.
 291  *      Right now core IDE code does this work which is deeply wrong.
 292  *      MMIO leaves it to the controller driver,
 293  *      PIO will migrate this way over time.
 294  */
 295
 296 int ide_hwif_request_regions(ide_hwif_t *hwif)
 297 {
 298         unsigned long addr;
 299         unsigned int i;
 300
 301         if (hwif->mmio)
 302                 return 0;
 303         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 304         if (addr && !hwif_request_region(hwif, addr, 1))
 305                 goto control_region_busy;
 306         hwif->straight8 = 0;
 307         addr = hwif->io_ports[IDE_DATA_OFFSET];
 308         if ((addr | 7) == hwif->io_ports[IDE_STATUS_OFFSET]) {
 309                 if (!hwif_request_region(hwif, addr, 8))
 310                         goto data_region_busy;
 311                 hwif->straight8 = 1;
 312                 return 0;
 313         }
 314         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
 315                 addr = hwif->io_ports[i];
 316                 if (!hwif_request_region(hwif, addr, 1)) {
 317                         while (--i)
 318                                 release_region(addr, 1);
 319                         goto data_region_busy;
 320                 }
 321         }
 322         return 0;
 323
 324 data_region_busy:
 325         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 326         if (addr)
 327                 release_region(addr, 1);
 328 control_region_busy:
 329         /* If any errors are return, we drop the hwif interface. */
 330         return -EBUSY;
 331 }
 332
 333 /**
 334  *      ide_hwif_release_regions - free IDE resources
 335  *
 336  *      Note that we only release the standard ports,
 337  *      and do not even try to handle any extra ports
 338  *      allocated for weird IDE interface chipsets.
 339  *
 340  *      Note also that we don't yet handle mmio resources here. More
 341  *      importantly our caller should be doing this so we need to
 342  *      restructure this as a helper function for drivers.
 343  */
 344
 345 void ide_hwif_release_regions(ide_hwif_t *hwif)
 346 {
 347         u32 i = 0;
 348
 349         if (hwif->mmio)
 350                 return;
 351         if (hwif->io_ports[IDE_CONTROL_OFFSET])
 352                 release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
 353         if (hwif->straight8) {
 354                 release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
 355                 return;
 356         }
 357         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
 358                 if (hwif->io_ports[i])
 359                         release_region(hwif->io_ports[i], 1);
 360 }
 361
 362 /**
 363  *      ide_hwif_restore        -       restore hwif to template
 364  *      @hwif: hwif to update
 365  *      @tmp_hwif: template
 366  *
 367  *      Restore hwif to a previous state by copying most settings
 368  *      from the template.
 369  */
 370
 371 static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
 372 {
 373         hwif->hwgroup                   = tmp_hwif->hwgroup;
 374
 375         hwif->gendev.parent             = tmp_hwif->gendev.parent;
 376
 377         hwif->proc                      = tmp_hwif->proc;
 378
 379         hwif->major                     = tmp_hwif->major;
 380         hwif->straight8                 = tmp_hwif->straight8;
 381         hwif->bus_state                 = tmp_hwif->bus_state;
 382
 383         hwif->host_flags                = tmp_hwif->host_flags;
 384
 385         hwif->pio_mask                  = tmp_hwif->pio_mask;
 386
 387         hwif->ultra_mask                = tmp_hwif->ultra_mask;
 388         hwif->mwdma_mask                = tmp_hwif->mwdma_mask;
 389         hwif->swdma_mask                = tmp_hwif->swdma_mask;
 390
 391         hwif->cbl                       = tmp_hwif->cbl;
 392
 393         hwif->chipset                   = tmp_hwif->chipset;
 394         hwif->hold                      = tmp_hwif->hold;
 395
 396         hwif->dev                       = tmp_hwif->dev;
 397
 398 #ifdef CONFIG_BLK_DEV_IDEPCI
 399         hwif->cds                       = tmp_hwif->cds;
 400 #endif
 401
 402         hwif->set_pio_mode              = tmp_hwif->set_pio_mode;
 403         hwif->set_dma_mode              = tmp_hwif->set_dma_mode;
 404         hwif->mdma_filter               = tmp_hwif->mdma_filter;
 405         hwif->udma_filter               = tmp_hwif->udma_filter;
 406         hwif->selectproc                = tmp_hwif->selectproc;
 407         hwif->reset_poll                = tmp_hwif->reset_poll;
 408         hwif->pre_reset                 = tmp_hwif->pre_reset;
 409         hwif->resetproc                 = tmp_hwif->resetproc;
 410         hwif->maskproc                  = tmp_hwif->maskproc;
 411         hwif->quirkproc                 = tmp_hwif->quirkproc;
 412         hwif->busproc                   = tmp_hwif->busproc;
 413
 414         hwif->ata_input_data            = tmp_hwif->ata_input_data;
 415         hwif->ata_output_data           = tmp_hwif->ata_output_data;
 416         hwif->atapi_input_bytes         = tmp_hwif->atapi_input_bytes;
 417         hwif->atapi_output_bytes        = tmp_hwif->atapi_output_bytes;
 418
 419         hwif->dma_host_set              = tmp_hwif->dma_host_set;
 420         hwif->dma_setup                 = tmp_hwif->dma_setup;
 421         hwif->dma_exec_cmd              = tmp_hwif->dma_exec_cmd;
 422         hwif->dma_start                 = tmp_hwif->dma_start;
 423         hwif->ide_dma_end               = tmp_hwif->ide_dma_end;
 424         hwif->ide_dma_test_irq          = tmp_hwif->ide_dma_test_irq;
 425         hwif->ide_dma_clear_irq         = tmp_hwif->ide_dma_clear_irq;
 426         hwif->dma_lost_irq              = tmp_hwif->dma_lost_irq;
 427         hwif->dma_timeout               = tmp_hwif->dma_timeout;
 428
 429         hwif->OUTB                      = tmp_hwif->OUTB;
 430         hwif->OUTBSYNC                  = tmp_hwif->OUTBSYNC;
 431         hwif->OUTW                      = tmp_hwif->OUTW;
 432         hwif->OUTSW                     = tmp_hwif->OUTSW;
 433         hwif->OUTSL                     = tmp_hwif->OUTSL;
 434
 435         hwif->INB                       = tmp_hwif->INB;
 436         hwif->INW                       = tmp_hwif->INW;
 437         hwif->INSW                      = tmp_hwif->INSW;
 438         hwif->INSL                      = tmp_hwif->INSL;
 439
 440         hwif->sg_max_nents              = tmp_hwif->sg_max_nents;
 441
 442         hwif->mmio                      = tmp_hwif->mmio;
 443         hwif->rqsize                    = tmp_hwif->rqsize;
 444
 445 #ifndef CONFIG_BLK_DEV_IDECS
 446         hwif->irq                       = tmp_hwif->irq;
 447 #endif
 448
 449         hwif->dma_base                  = tmp_hwif->dma_base;
 450         hwif->dma_command               = tmp_hwif->dma_command;
 451         hwif->dma_vendor1               = tmp_hwif->dma_vendor1;
 452         hwif->dma_status                = tmp_hwif->dma_status;
 453         hwif->dma_vendor3               = tmp_hwif->dma_vendor3;
 454         hwif->dma_prdtable              = tmp_hwif->dma_prdtable;
 455
 456         hwif->config_data               = tmp_hwif->config_data;
 457         hwif->select_data               = tmp_hwif->select_data;
 458         hwif->extra_base                = tmp_hwif->extra_base;
 459         hwif->extra_ports               = tmp_hwif->extra_ports;
 460
 461         hwif->hwif_data                 = tmp_hwif->hwif_data;
 462 }
 463
 464 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
 465 {
 466         ide_hwgroup_t *hwgroup = hwif->hwgroup;
 467
 468         spin_lock_irq(&ide_lock);
 469         /*
 470          * Remove us from the hwgroup, and free
 471          * the hwgroup if we were the only member
 472          */
 473         if (hwif->next == hwif) {
 474                 BUG_ON(hwgroup->hwif != hwif);
 475                 kfree(hwgroup);
 476         } else {
 477                 /* There is another interface in hwgroup.
 478                  * Unlink us, and set hwgroup->drive and ->hwif to
 479                  * something sane.
 480                  */
 481                 ide_hwif_t *g = hwgroup->hwif;
 482
 483                 while (g->next != hwif)
 484                         g = g->next;
 485                 g->next = hwif->next;
 486                 if (hwgroup->hwif == hwif) {
 487                         /* Chose a random hwif for hwgroup->hwif.
 488                          * It's guaranteed that there are no drives
 489                          * left in the hwgroup.
 490                          */
 491                         BUG_ON(hwgroup->drive != NULL);
 492                         hwgroup->hwif = g;
 493                 }
 494                 BUG_ON(hwgroup->hwif == hwif);
 495         }
 496         spin_unlock_irq(&ide_lock);
 497 }
 498
 499 /**
 500  *      ide_unregister          -       free an IDE interface
 501  *      @index: index of interface (will change soon to a pointer)
 502  *
 503  *      Perform the final unregister of an IDE interface. At the moment
 504  *      we don't refcount interfaces so this will also get split up.
 505  *
 506  *      Locking:
 507  *      The caller must not hold the IDE locks
 508  *      The drive present/vanishing is not yet properly locked
 509  *      Take care with the callbacks. These have been split to avoid
 510  *      deadlocking the IDE layer. The shutdown callback is called
 511  *      before we take the lock and free resources. It is up to the
 512  *      caller to be sure there is no pending I/O here, and that
 513  *      the interface will not be reopened (present/vanishing locking
 514  *      isn't yet done BTW). After we commit to the final kill we
 515  *      call the cleanup callback with the ide locks held.
 516  *
 517  *      Unregister restores the hwif structures to the default state.
 518  *      This is raving bonkers.
 519  */
 520
 521 void ide_unregister(unsigned int index)
 522 {
 523         ide_drive_t *drive;
 524         ide_hwif_t *hwif, *g;
 525         static ide_hwif_t tmp_hwif; /* protected by ide_cfg_mtx */
 526         ide_hwgroup_t *hwgroup;
 527         int irq_count = 0, unit;
 528
 529         BUG_ON(index >= MAX_HWIFS);
 530
 531         BUG_ON(in_interrupt());
 532         BUG_ON(irqs_disabled());
 533         mutex_lock(&ide_cfg_mtx);
 534         spin_lock_irq(&ide_lock);
 535         hwif = &ide_hwifs[index];
 536         if (!hwif->present)
 537                 goto abort;
 538         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 539                 drive = &hwif->drives[unit];
 540                 if (!drive->present)
 541                         continue;
 542                 spin_unlock_irq(&ide_lock);
 543                 device_unregister(&drive->gendev);
 544                 wait_for_completion(&drive->gendev_rel_comp);
 545                 spin_lock_irq(&ide_lock);
 546         }
 547         hwif->present = 0;
 548
 549         spin_unlock_irq(&ide_lock);
 550
 551         ide_proc_unregister_port(hwif);
 552
 553         hwgroup = hwif->hwgroup;
 554         /*
 555          * free the irq if we were the only hwif using it
 556          */
 557         g = hwgroup->hwif;
 558         do {
 559                 if (g->irq == hwif->irq)
 560                         ++irq_count;
 561                 g = g->next;
 562         } while (g != hwgroup->hwif);
 563         if (irq_count == 1)
 564                 free_irq(hwif->irq, hwgroup);
 565
 566         ide_remove_port_from_hwgroup(hwif);
 567
 568         device_unregister(&hwif->gendev);
 569         wait_for_completion(&hwif->gendev_rel_comp);
 570
 571         /*
 572          * Remove us from the kernel's knowledge
 573          */
 574         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 575         kfree(hwif->sg_table);
 576         unregister_blkdev(hwif->major, hwif->name);
 577         spin_lock_irq(&ide_lock);
 578
 579         if (hwif->dma_base) {
 580                 (void) ide_release_dma(hwif);
 581
 582                 hwif->dma_base = 0;
 583                 hwif->dma_command = 0;
 584                 hwif->dma_vendor1 = 0;
 585                 hwif->dma_status = 0;
 586                 hwif->dma_vendor3 = 0;
 587                 hwif->dma_prdtable = 0;
 588
 589                 hwif->extra_base  = 0;
 590                 hwif->extra_ports = 0;
 591         }
 592
 593         /*
 594          * Note that we only release the standard ports,
 595          * and do not even try to handle any extra ports
 596          * allocated for weird IDE interface chipsets.
 597          */
 598         ide_hwif_release_regions(hwif);
 599
 600         /* copy original settings */
 601         tmp_hwif = *hwif;
 602
 603         /* restore hwif data to pristine status */
 604         ide_init_port_data(hwif, index);
 605         init_hwif_default(hwif, index);
 606
 607         ide_hwif_restore(hwif, &tmp_hwif);
 608
 609 abort:
 610         spin_unlock_irq(&ide_lock);
 611         mutex_unlock(&ide_cfg_mtx);
 612 }
 613
 614 EXPORT_SYMBOL(ide_unregister);
 615
 616
 617 /**
 618  *      ide_setup_ports         -       set up IDE interface ports
 619  *      @hw: register descriptions
 620  *      @base: base register
 621  *      @offsets: table of register offsets
 622  *      @ctrl: control register
 623  *      @ack_irq: IRQ ack
 624  *      @irq: interrupt lie
 625  *
 626  *      Setup hw_regs_t structure described by parameters.  You
 627  *      may set up the hw structure yourself OR use this routine to
 628  *      do it for you. This is basically a helper
 629  *
 630  */
 631
 632 void ide_setup_ports (  hw_regs_t *hw,
 633                         unsigned long base, int *offsets,
 634                         unsigned long ctrl, unsigned long intr,
 635                         ide_ack_intr_t *ack_intr,
 636 /*
 637  *                      ide_io_ops_t *iops,
 638  */
 639                         int irq)
 640 {
 641         int i;
 642
 643         memset(hw, 0, sizeof(hw_regs_t));
 644         for (i = 0; i < IDE_NR_PORTS; i++) {
 645                 if (offsets[i] == -1) {
 646                         switch(i) {
 647                                 case IDE_CONTROL_OFFSET:
 648                                         hw->io_ports[i] = ctrl;
 649                                         break;
 650 #if defined(CONFIG_AMIGA) || defined(CONFIG_MAC)
 651                                 case IDE_IRQ_OFFSET:
 652                                         hw->io_ports[i] = intr;
 653                                         break;
 654 #endif /* (CONFIG_AMIGA) || (CONFIG_MAC) */
 655                                 default:
 656                                         hw->io_ports[i] = 0;
 657                                         break;
 658                         }
 659                 } else {
 660                         hw->io_ports[i] = base + offsets[i];
 661                 }
 662         }
 663         hw->irq = irq;
 664         hw->ack_intr = ack_intr;
 665 /*
 666  *      hw->iops = iops;
 667  */
 668 }
 669
 670 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
 671 {
 672         memcpy(hwif->io_ports, hw->io_ports, sizeof(hwif->io_ports));
 673         hwif->irq = hw->irq;
 674         hwif->noprobe = 0;
 675         hwif->chipset = hw->chipset;
 676         hwif->gendev.parent = hw->dev;
 677         hwif->ack_intr = hw->ack_intr;
 678 }
 679 EXPORT_SYMBOL_GPL(ide_init_port_hw);
 680
 681 /**
 682  *      ide_register_hw         -       register IDE interface
 683  *      @hw: hardware registers
 684  *      @quirkproc: quirkproc function
 685  *      @hwifp: pointer to returned hwif
 686  *
 687  *      Register an IDE interface, specifying exactly the registers etc.
 688  *
 689  *      Returns -1 on error.
 690  */
 691
 692 int ide_register_hw(hw_regs_t *hw, void (*quirkproc)(ide_drive_t *),
 693                     ide_hwif_t **hwifp)
 694 {
 695         int index, retry = 1;
 696         ide_hwif_t *hwif;
 697         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
 698
 699         do {
 700                 for (index = 0; index < MAX_HWIFS; ++index) {
 701                         hwif = &ide_hwifs[index];
 702                         if (hwif->io_ports[IDE_DATA_OFFSET] == hw->io_ports[IDE_DATA_OFFSET])
 703                                 goto found;
 704                 }
 705                 for (index = 0; index < MAX_HWIFS; ++index) {
 706                         hwif = &ide_hwifs[index];
 707                         if (hwif->hold)
 708                                 continue;
 709                         if (!hwif->present && hwif->mate == NULL)
 710                                 goto found;
 711                 }
 712                 for (index = 0; index < MAX_HWIFS; index++)
 713                         ide_unregister(index);
 714         } while (retry--);
 715         return -1;
 716 found:
 717         if (hwif->present)
 718                 ide_unregister(index);
 719         else if (!hwif->hold) {
 720                 ide_init_port_data(hwif, index);
 721                 init_hwif_default(hwif, index);
 722         }
 723         if (hwif->present)
 724                 return -1;
 725
 726         ide_init_port_hw(hwif, hw);
 727         hwif->quirkproc = quirkproc;
 728
 729         idx[0] = index;
 730
 731         ide_device_add(idx);
 732
 733         if (hwifp)
 734                 *hwifp = hwif;
 735
 736         return hwif->present ? index : -1;
 737 }
 738
 739 EXPORT_SYMBOL(ide_register_hw);
 740
 741 /*
 742  *      Locks for IDE setting functionality
 743  */
 744
 745 DEFINE_MUTEX(ide_setting_mtx);
 746
 747 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 748
 749 /**
 750  *      ide_spin_wait_hwgroup   -       wait for group
 751  *      @drive: drive in the group
 752  *
 753  *      Wait for an IDE device group to go non busy and then return
 754  *      holding the ide_lock which guards the hwgroup->busy status
 755  *      and right to use it.
 756  */
 757
 758 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 759 {
 760         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 761         unsigned long timeout = jiffies + (3 * HZ);
 762
 763         spin_lock_irq(&ide_lock);
 764
 765         while (hwgroup->busy) {
 766                 unsigned long lflags;
 767                 spin_unlock_irq(&ide_lock);
 768                 local_irq_set(lflags);
 769                 if (time_after(jiffies, timeout)) {
 770                         local_irq_restore(lflags);
 771                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 772                         return -EBUSY;
 773                 }
 774                 local_irq_restore(lflags);
 775                 spin_lock_irq(&ide_lock);
 776         }
 777         return 0;
 778 }
 779
 780 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 781
 782 int set_io_32bit(ide_drive_t *drive, int arg)
 783 {
 784         if (drive->no_io_32bit)
 785                 return -EPERM;
 786
 787         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 788                 return -EINVAL;
 789
 790         if (ide_spin_wait_hwgroup(drive))
 791                 return -EBUSY;
 792
 793         drive->io_32bit = arg;
 794 #ifdef CONFIG_BLK_DEV_DTC2278
 795         if (HWIF(drive)->chipset == ide_dtc2278)
 796                 HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
 797 #endif /* CONFIG_BLK_DEV_DTC2278 */
 798
 799         spin_unlock_irq(&ide_lock);
 800
 801         return 0;
 802 }
 803
 804 static int set_ksettings(ide_drive_t *drive, int arg)
 805 {
 806         if (arg < 0 || arg > 1)
 807                 return -EINVAL;
 808
 809         if (ide_spin_wait_hwgroup(drive))
 810                 return -EBUSY;
 811         drive->keep_settings = arg;
 812         spin_unlock_irq(&ide_lock);
 813
 814         return 0;
 815 }
 816
 817 int set_using_dma(ide_drive_t *drive, int arg)
 818 {
 819 #ifdef CONFIG_BLK_DEV_IDEDMA
 820         ide_hwif_t *hwif = drive->hwif;
 821         int err = -EPERM;
 822
 823         if (arg < 0 || arg > 1)
 824                 return -EINVAL;
 825
 826         if (!drive->id || !(drive->id->capability & 1))
 827                 goto out;
 828
 829         if (hwif->dma_host_set == NULL)
 830                 goto out;
 831
 832         err = -EBUSY;
 833         if (ide_spin_wait_hwgroup(drive))
 834                 goto out;
 835         /*
 836          * set ->busy flag, unlock and let it ride
 837          */
 838         hwif->hwgroup->busy = 1;
 839         spin_unlock_irq(&ide_lock);
 840
 841         err = 0;
 842
 843         if (arg) {
 844                 if (ide_set_dma(drive))
 845                         err = -EIO;
 846         } else
 847                 ide_dma_off(drive);
 848
 849         /*
 850          * lock, clear ->busy flag and unlock before leaving
 851          */
 852         spin_lock_irq(&ide_lock);
 853         hwif->hwgroup->busy = 0;
 854         spin_unlock_irq(&ide_lock);
 855 out:
 856         return err;
 857 #else
 858         if (arg < 0 || arg > 1)
 859                 return -EINVAL;
 860
 861         return -EPERM;
 862 #endif
 863 }
 864
 865 int set_pio_mode(ide_drive_t *drive, int arg)
 866 {
 867         struct request rq;
 868
 869         if (arg < 0 || arg > 255)
 870                 return -EINVAL;
 871
 872         if (drive->hwif->set_pio_mode == NULL)
 873                 return -ENOSYS;
 874
 875         if (drive->special.b.set_tune)
 876                 return -EBUSY;
 877
 878         ide_init_drive_cmd(&rq);
 879         rq.cmd_type = REQ_TYPE_ATA_TASKFILE;
 880
 881         drive->tune_req = (u8) arg;
 882         drive->special.b.set_tune = 1;
 883         (void) ide_do_drive_cmd(drive, &rq, ide_wait);
 884         return 0;
 885 }
 886
 887 static int set_unmaskirq(ide_drive_t *drive, int arg)
 888 {
 889         if (drive->no_unmask)
 890                 return -EPERM;
 891
 892         if (arg < 0 || arg > 1)
 893                 return -EINVAL;
 894
 895         if (ide_spin_wait_hwgroup(drive))
 896                 return -EBUSY;
 897         drive->unmask = arg;
 898         spin_unlock_irq(&ide_lock);
 899
 900         return 0;
 901 }
 902
 903 /**
 904  *      system_bus_clock        -       clock guess
 905  *
 906  *      External version of the bus clock guess used by very old IDE drivers
 907  *      for things like VLB timings. Should not be used.
 908  */
 909
 910 int system_bus_clock (void)
 911 {
 912         return system_bus_speed;
 913 }
 914
 915 EXPORT_SYMBOL(system_bus_clock);
 916
 917 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 918 {
 919         ide_drive_t *drive = dev->driver_data;
 920         ide_hwif_t *hwif = HWIF(drive);
 921         struct request rq;
 922         struct request_pm_state rqpm;
 923         ide_task_t args;
 924         int ret;
 925
 926         /* Call ACPI _GTM only once */
 927         if (!(drive->dn % 2))
 928                 ide_acpi_get_timing(hwif);
 929
 930         memset(&rq, 0, sizeof(rq));
 931         memset(&rqpm, 0, sizeof(rqpm));
 932         memset(&args, 0, sizeof(args));
 933         rq.cmd_type = REQ_TYPE_PM_SUSPEND;
 934         rq.special = &args;
 935         rq.data = &rqpm;
 936         rqpm.pm_step = ide_pm_state_start_suspend;
 937         if (mesg.event == PM_EVENT_PRETHAW)
 938                 mesg.event = PM_EVENT_FREEZE;
 939         rqpm.pm_state = mesg.event;
 940
 941         ret = ide_do_drive_cmd(drive, &rq, ide_wait);
 942         /* only call ACPI _PS3 after both drivers are suspended */
 943         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 944                  && hwif->drives[1].present)
 945                  || !hwif->drives[0].present
 946                  || !hwif->drives[1].present))
 947                 ide_acpi_set_state(hwif, 0);
 948         return ret;
 949 }
 950
 951 static int generic_ide_resume(struct device *dev)
 952 {
 953         ide_drive_t *drive = dev->driver_data;
 954         ide_hwif_t *hwif = HWIF(drive);
 955         struct request rq;
 956         struct request_pm_state rqpm;
 957         ide_task_t args;
 958         int err;
 959
 960         /* Call ACPI _STM only once */
 961         if (!(drive->dn % 2)) {
 962                 ide_acpi_set_state(hwif, 1);
 963                 ide_acpi_push_timing(hwif);
 964         }
 965
 966         ide_acpi_exec_tfs(drive);
 967
 968         memset(&rq, 0, sizeof(rq));
 969         memset(&rqpm, 0, sizeof(rqpm));
 970         memset(&args, 0, sizeof(args));
 971         rq.cmd_type = REQ_TYPE_PM_RESUME;
 972         rq.special = &args;
 973         rq.data = &rqpm;
 974         rqpm.pm_step = ide_pm_state_start_resume;
 975         rqpm.pm_state = PM_EVENT_ON;
 976
 977         err = ide_do_drive_cmd(drive, &rq, ide_head_wait);
 978
 979         if (err == 0 && dev->driver) {
 980                 ide_driver_t *drv = to_ide_driver(dev->driver);
 981
 982                 if (drv->resume)
 983                         drv->resume(drive);
 984         }
 985
 986         return err;
 987 }
 988
 989 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 990                         unsigned int cmd, unsigned long arg)
 991 {
 992         unsigned long flags;
 993         ide_driver_t *drv;
 994         void __user *p = (void __user *)arg;
 995         int err = 0, (*setfunc)(ide_drive_t *, int);
 996         u8 *val;
 997
 998         switch (cmd) {
 999         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
1000         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
1001         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
1002         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
1003         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
1004         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
1005         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
1006         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
1007         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
1008         }
1009
1010         switch (cmd) {
1011                 case HDIO_OBSOLETE_IDENTITY:
1012                 case HDIO_GET_IDENTITY:
1013                         if (bdev != bdev->bd_contains)
1014                                 return -EINVAL;
1015                         if (drive->id_read == 0)
1016                                 return -ENOMSG;
1017                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
1018                                 return -EFAULT;
1019                         return 0;
1020
1021                 case HDIO_GET_NICE:
1022                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
1023                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
1024                                         drive->nice0            <<      IDE_NICE_0              |
1025                                         drive->nice1            <<      IDE_NICE_1              |
1026                                         drive->nice2            <<      IDE_NICE_2,
1027                                         (long __user *) arg);
1028
1029 #ifdef CONFIG_IDE_TASK_IOCTL
1030                 case HDIO_DRIVE_TASKFILE:
1031                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1032                                 return -EACCES;
1033                         switch(drive->media) {
1034                                 case ide_disk:
1035                                         return ide_taskfile_ioctl(drive, cmd, arg);
1036                                 default:
1037                                         return -ENOMSG;
1038                         }
1039 #endif /* CONFIG_IDE_TASK_IOCTL */
1040
1041                 case HDIO_DRIVE_CMD:
1042                         if (!capable(CAP_SYS_RAWIO))
1043                                 return -EACCES;
1044                         return ide_cmd_ioctl(drive, cmd, arg);
1045
1046                 case HDIO_DRIVE_TASK:
1047                         if (!capable(CAP_SYS_RAWIO))
1048                                 return -EACCES;
1049                         return ide_task_ioctl(drive, cmd, arg);
1050
1051                 case HDIO_SCAN_HWIF:
1052                 {
1053                         hw_regs_t hw;
1054                         int args[3];
1055                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1056                         if (copy_from_user(args, p, 3 * sizeof(int)))
1057                                 return -EFAULT;
1058                         memset(&hw, 0, sizeof(hw));
1059                         ide_init_hwif_ports(&hw, (unsigned long) args[0],
1060                                             (unsigned long) args[1], NULL);
1061                         hw.irq = args[2];
1062                         if (ide_register_hw(&hw, NULL, NULL) == -1)
1063                                 return -EIO;
1064                         return 0;
1065                 }
1066                 case HDIO_UNREGISTER_HWIF:
1067                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1068                         /* (arg > MAX_HWIFS) checked in function */
1069                         ide_unregister(arg);
1070                         return 0;
1071                 case HDIO_SET_NICE:
1072                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1073                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
1074                                 return -EPERM;
1075                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
1076                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
1077                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
1078                                 drive->dsc_overlap = 0;
1079                                 return -EPERM;
1080                         }
1081                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
1082                         return 0;
1083                 case HDIO_DRIVE_RESET:
1084                 {
1085                         unsigned long flags;
1086                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1087
1088                         /*
1089                          *      Abort the current command on the
1090                          *      group if there is one, taking
1091                          *      care not to allow anything else
1092                          *      to be queued and to die on the
1093                          *      spot if we miss one somehow
1094                          */
1095
1096                         spin_lock_irqsave(&ide_lock, flags);
1097
1098                         if (HWGROUP(drive)->resetting) {
1099                                 spin_unlock_irqrestore(&ide_lock, flags);
1100                                 return -EBUSY;
1101                         }
1102
1103                         ide_abort(drive, "drive reset");
1104
1105                         BUG_ON(HWGROUP(drive)->handler);
1106
1107                         /* Ensure nothing gets queued after we
1108                            drop the lock. Reset will clear the busy */
1109
1110                         HWGROUP(drive)->busy = 1;
1111                         spin_unlock_irqrestore(&ide_lock, flags);
1112                         (void) ide_do_reset(drive);
1113
1114                         return 0;
1115                 }
1116
1117                 case HDIO_GET_BUSSTATE:
1118                         if (!capable(CAP_SYS_ADMIN))
1119                                 return -EACCES;
1120                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
1121                                 return -EFAULT;
1122                         return 0;
1123
1124                 case HDIO_SET_BUSSTATE:
1125                         if (!capable(CAP_SYS_ADMIN))
1126                                 return -EACCES;
1127                         if (HWIF(drive)->busproc)
1128                                 return HWIF(drive)->busproc(drive, (int)arg);
1129                         return -EOPNOTSUPP;
1130                 default:
1131                         return -EINVAL;
1132         }
1133
1134 read_val:
1135         mutex_lock(&ide_setting_mtx);
1136         spin_lock_irqsave(&ide_lock, flags);
1137         err = *val;
1138         spin_unlock_irqrestore(&ide_lock, flags);
1139         mutex_unlock(&ide_setting_mtx);
1140         return err >= 0 ? put_user(err, (long __user *)arg) : err;
1141
1142 set_val:
1143         if (bdev != bdev->bd_contains)
1144                 err = -EINVAL;
1145         else {
1146                 if (!capable(CAP_SYS_ADMIN))
1147                         err = -EACCES;
1148                 else {
1149                         mutex_lock(&ide_setting_mtx);
1150                         err = setfunc(drive, arg);
1151                         mutex_unlock(&ide_setting_mtx);
1152                 }
1153         }
1154         return err;
1155 }
1156
1157 EXPORT_SYMBOL(generic_ide_ioctl);
1158
1159 /*
1160  * stridx() returns the offset of c within s,
1161  * or -1 if c is '\0' or not found within s.
1162  */
1163 static int __init stridx (const char *s, char c)
1164 {
1165         char *i = strchr(s, c);
1166         return (i && c) ? i - s : -1;
1167 }
1168
1169 /*
1170  * match_parm() does parsing for ide_setup():
1171  *
1172  * 1. the first char of s must be '='.
1173  * 2. if the remainder matches one of the supplied keywords,
1174  *     the index (1 based) of the keyword is negated and returned.
1175  * 3. if the remainder is a series of no more than max_vals numbers
1176  *     separated by commas, the numbers are saved in vals[] and a
1177  *     count of how many were saved is returned.  Base10 is assumed,
1178  *     and base16 is allowed when prefixed with "0x".
1179  * 4. otherwise, zero is returned.
1180  */
1181 static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
1182 {
1183         static const char *decimal = "0123456789";
1184         static const char *hex = "0123456789abcdef";
1185         int i, n;
1186
1187         if (*s++ == '=') {
1188                 /*
1189                  * Try matching against the supplied keywords,
1190                  * and return -(index+1) if we match one
1191                  */
1192                 if (keywords != NULL) {
1193                         for (i = 0; *keywords != NULL; ++i) {
1194                                 if (!strcmp(s, *keywords++))
1195                                         return -(i+1);
1196                         }
1197                 }
1198                 /*
1199                  * Look for a series of no more than "max_vals"
1200                  * numeric values separated by commas, in base10,
1201                  * or base16 when prefixed with "0x".
1202                  * Return a count of how many were found.
1203                  */
1204                 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
1205                         vals[n] = i;
1206                         while ((i = stridx(decimal, *++s)) >= 0)
1207                                 vals[n] = (vals[n] * 10) + i;
1208                         if (*s == 'x' && !vals[n]) {
1209                                 while ((i = stridx(hex, *++s)) >= 0)
1210                                         vals[n] = (vals[n] * 0x10) + i;
1211                         }
1212                         if (++n == max_vals)
1213                                 break;
1214                         if (*s == ',' || *s == ';')
1215                                 ++s;
1216                 }
1217                 if (!*s)
1218                         return n;
1219         }
1220         return 0;       /* zero = nothing matched */
1221 }
1222
1223 extern int probe_ali14xx;
1224 extern int probe_umc8672;
1225 extern int probe_dtc2278;
1226 extern int probe_ht6560b;
1227 extern int probe_qd65xx;
1228 extern int cmd640_vlb;
1229
1230 static int __initdata is_chipset_set[MAX_HWIFS];
1231
1232 /*
1233  * ide_setup() gets called VERY EARLY during initialization,
1234  * to handle kernel "command line" strings beginning with "hdx=" or "ide".
1235  *
1236  * Remember to update Documentation/ide.txt if you change something here.
1237  */
1238 static int __init ide_setup(char *s)
1239 {
1240         int i, vals[3];
1241         ide_hwif_t *hwif;
1242         ide_drive_t *drive;
1243         unsigned int hw, unit;
1244         const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
1245         const char max_hwif  = '0' + (MAX_HWIFS - 1);
1246
1247
1248         if (strncmp(s,"hd",2) == 0 && s[2] == '=')      /* hd= is for hd.c   */
1249                 return 0;                               /* driver and not us */
1250
1251         if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
1252                 return 0;
1253
1254         printk(KERN_INFO "ide_setup: %s", s);
1255         init_ide_data ();
1256
1257 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
1258         if (!strcmp(s, "ide=doubler")) {
1259                 extern int ide_doubler;
1260
1261                 printk(" : Enabled support for IDE doublers\n");
1262                 ide_doubler = 1;
1263                 return 1;
1264         }
1265 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
1266
1267         if (!strcmp(s, "ide=nodma")) {
1268                 printk(" : Prevented DMA\n");
1269                 noautodma = 1;
1270                 goto obsolete_option;
1271         }
1272
1273 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
1274         if (!strcmp(s, "ide=reverse")) {
1275                 ide_scan_direction = 1;
1276                 printk(" : Enabled support for IDE inverse scan order.\n");
1277                 return 1;
1278         }
1279 #endif
1280
1281 #ifdef CONFIG_BLK_DEV_IDEACPI
1282         if (!strcmp(s, "ide=noacpi")) {
1283                 //printk(" : Disable IDE ACPI support.\n");
1284                 ide_noacpi = 1;
1285                 return 1;
1286         }
1287         if (!strcmp(s, "ide=acpigtf")) {
1288                 //printk(" : Enable IDE ACPI _GTF support.\n");
1289                 ide_noacpitfs = 0;
1290                 return 1;
1291         }
1292         if (!strcmp(s, "ide=acpionboot")) {
1293                 //printk(" : Call IDE ACPI methods on boot.\n");
1294                 ide_noacpionboot = 0;
1295                 return 1;
1296         }
1297 #endif /* CONFIG_BLK_DEV_IDEACPI */
1298
1299         /*
1300          * Look for drive options:  "hdx="
1301          */
1302         if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
1303                 const char *hd_words[] = {
1304                         "none", "noprobe", "nowerr", "cdrom", "nodma",
1305                         "autotune", "noautotune", "-8", "-9", "-10",
1306                         "noflush", "remap", "remap63", "scsi", NULL };
1307                 unit = s[2] - 'a';
1308                 hw   = unit / MAX_DRIVES;
1309                 unit = unit % MAX_DRIVES;
1310                 hwif = &ide_hwifs[hw];
1311                 drive = &hwif->drives[unit];
1312                 if (strncmp(s + 4, "ide-", 4) == 0) {
1313                         strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
1314                         goto done;
1315                 }
1316                 switch (match_parm(&s[3], hd_words, vals, 3)) {
1317                         case -1: /* "none" */
1318                         case -2: /* "noprobe" */
1319                                 drive->noprobe = 1;
1320                                 goto done;
1321                         case -3: /* "nowerr" */
1322                                 drive->bad_wstat = BAD_R_STAT;
1323                                 hwif->noprobe = 0;
1324                                 goto done;
1325                         case -4: /* "cdrom" */
1326                                 drive->present = 1;
1327                                 drive->media = ide_cdrom;
1328                                 /* an ATAPI device ignores DRDY */
1329                                 drive->ready_stat = 0;
1330                                 hwif->noprobe = 0;
1331                                 goto done;
1332                         case -5: /* nodma */
1333                                 drive->nodma = 1;
1334                                 goto done;
1335                         case -6: /* "autotune" */
1336                                 drive->autotune = IDE_TUNE_AUTO;
1337                                 goto obsolete_option;
1338                         case -7: /* "noautotune" */
1339                                 drive->autotune = IDE_TUNE_NOAUTO;
1340                                 goto obsolete_option;
1341                         case -11: /* noflush */
1342                                 drive->noflush = 1;
1343                                 goto done;
1344                         case -12: /* "remap" */
1345                                 drive->remap_0_to_1 = 1;
1346                                 goto done;
1347                         case -13: /* "remap63" */
1348                                 drive->sect0 = 63;
1349                                 goto done;
1350                         case -14: /* "scsi" */
1351                                 drive->scsi = 1;
1352                                 goto done;
1353                         case 3: /* cyl,head,sect */
1354                                 drive->media    = ide_disk;
1355                                 drive->ready_stat = READY_STAT;
1356                                 drive->cyl      = drive->bios_cyl  = vals[0];
1357                                 drive->head     = drive->bios_head = vals[1];
1358                                 drive->sect     = drive->bios_sect = vals[2];
1359                                 drive->present  = 1;
1360                                 drive->forced_geom = 1;
1361                                 hwif->noprobe = 0;
1362                                 goto done;
1363                         default:
1364                                 goto bad_option;
1365                 }
1366         }
1367
1368         if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
1369                 goto bad_option;
1370         /*
1371          * Look for bus speed option:  "idebus="
1372          */
1373         if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
1374                 if (match_parm(&s[6], NULL, vals, 1) != 1)
1375                         goto bad_option;
1376                 if (vals[0] >= 20 && vals[0] <= 66) {
1377                         idebus_parameter = vals[0];
1378                 } else
1379                         printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
1380                 goto done;
1381         }
1382         /*
1383          * Look for interface options:  "idex="
1384          */
1385         if (s[3] >= '0' && s[3] <= max_hwif) {
1386                 /*
1387                  * Be VERY CAREFUL changing this: note hardcoded indexes below
1388                  * (-8, -9, -10) are reserved to ease the hardcoding.
1389                  */
1390                 static const char *ide_words[] = {
1391                         "noprobe", "serialize", "minus3", "minus4",
1392                         "reset", "minus6", "ata66", "minus8", "minus9",
1393                         "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
1394                         "dtc2278", "umc8672", "ali14xx", NULL };
1395
1396                 hw_regs_t hwregs;
1397
1398                 hw = s[3] - '0';
1399                 hwif = &ide_hwifs[hw];
1400                 i = match_parm(&s[4], ide_words, vals, 3);
1401
1402                 /*
1403                  * Cryptic check to ensure chipset not already set for hwif.
1404                  * Note: we can't depend on hwif->chipset here.
1405                  */
1406                 if ((i >= -18 && i <= -11) || (i > 0 && i <= 3)) {
1407                         /* chipset already specified */
1408                         if (is_chipset_set[hw])
1409                                 goto bad_option;
1410                         if (i > -18 && i <= -11) {
1411                                 /* these drivers are for "ide0=" only */
1412                                 if (hw != 0)
1413                                         goto bad_hwif;
1414                                 /* chipset already specified for 2nd port */
1415                                 if (is_chipset_set[hw+1])
1416                                         goto bad_option;
1417                         }
1418                         is_chipset_set[hw] = 1;
1419                         printk("\n");
1420                 }
1421
1422                 switch (i) {
1423 #ifdef CONFIG_BLK_DEV_ALI14XX
1424                         case -17: /* "ali14xx" */
1425                                 probe_ali14xx = 1;
1426                                 goto done;
1427 #endif
1428 #ifdef CONFIG_BLK_DEV_UMC8672
1429                         case -16: /* "umc8672" */
1430                                 probe_umc8672 = 1;
1431                                 goto done;
1432 #endif
1433 #ifdef CONFIG_BLK_DEV_DTC2278
1434                         case -15: /* "dtc2278" */
1435                                 probe_dtc2278 = 1;
1436                                 goto done;
1437 #endif
1438 #ifdef CONFIG_BLK_DEV_CMD640
1439                         case -14: /* "cmd640_vlb" */
1440                                 cmd640_vlb = 1;
1441                                 goto done;
1442 #endif
1443 #ifdef CONFIG_BLK_DEV_HT6560B
1444                         case -13: /* "ht6560b" */
1445                                 probe_ht6560b = 1;
1446                                 goto done;
1447 #endif
1448 #ifdef CONFIG_BLK_DEV_QD65XX
1449                         case -12: /* "qd65xx" */
1450                                 probe_qd65xx = 1;
1451                                 goto done;
1452 #endif
1453 #ifdef CONFIG_BLK_DEV_4DRIVES
1454                         case -11: /* "four" drives on one set of ports */
1455                         {
1456                                 ide_hwif_t *mate = &ide_hwifs[hw^1];
1457                                 mate->drives[0].select.all ^= 0x20;
1458                                 mate->drives[1].select.all ^= 0x20;
1459                                 hwif->chipset = mate->chipset = ide_4drives;
1460                                 mate->irq = hwif->irq;
1461                                 memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
1462                                 hwif->mate = mate;
1463                                 mate->mate = hwif;
1464                                 hwif->serialized = mate->serialized = 1;
1465                                 goto obsolete_option;
1466                         }
1467 #endif /* CONFIG_BLK_DEV_4DRIVES */
1468                         case -10: /* minus10 */
1469                         case -9: /* minus9 */
1470                         case -8: /* minus8 */
1471                         case -6:
1472                         case -4:
1473                         case -3:
1474                                 goto bad_option;
1475                         case -7: /* ata66 */
1476 #ifdef CONFIG_BLK_DEV_IDEPCI
1477                                 /*
1478                                  * Use ATA_CBL_PATA40_SHORT so drive side
1479                                  * cable detection is also overriden.
1480                                  */
1481                                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1482                                 goto obsolete_option;
1483 #else
1484                                 goto bad_hwif;
1485 #endif
1486                         case -5: /* "reset" */
1487                                 hwif->reset = 1;
1488                                 goto obsolete_option;
1489                         case -2: /* "serialize" */
1490                                 hwif->mate = &ide_hwifs[hw^1];
1491                                 hwif->mate->mate = hwif;
1492                                 hwif->serialized = hwif->mate->serialized = 1;
1493                                 goto obsolete_option;
1494
1495                         case -1: /* "noprobe" */
1496                                 hwif->noprobe = 1;
1497                                 goto done;
1498
1499                         case 1: /* base */
1500                                 vals[1] = vals[0] + 0x206; /* default ctl */
1501                         case 2: /* base,ctl */
1502                                 vals[2] = 0;    /* default irq = probe for it */
1503                         case 3: /* base,ctl,irq */
1504                                 memset(&hwregs, 0, sizeof(hwregs));
1505                                 ide_init_hwif_ports(&hwregs, vals[0], vals[1], &hwif->irq);
1506                                 memcpy(hwif->io_ports, hwregs.io_ports, sizeof(hwif->io_ports));
1507                                 hwif->irq      = vals[2];
1508                                 hwif->noprobe  = 0;
1509                                 hwif->chipset  = ide_forced;
1510                                 goto obsolete_option;
1511
1512                         case 0: goto bad_option;
1513                         default:
1514                                 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
1515                                 return 1;
1516                 }
1517         }
1518 bad_option:
1519         printk(" -- BAD OPTION\n");
1520         return 1;
1521 obsolete_option:
1522         printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
1523         return 1;
1524 bad_hwif:
1525         printk("-- NOT SUPPORTED ON ide%d", hw);
1526 done:
1527         printk("\n");
1528         return 1;
1529 }
1530
1531 EXPORT_SYMBOL(ide_lock);
1532
1533 static int ide_bus_match(struct device *dev, struct device_driver *drv)
1534 {
1535         return 1;
1536 }
1537
1538 static char *media_string(ide_drive_t *drive)
1539 {
1540         switch (drive->media) {
1541         case ide_disk:
1542                 return "disk";
1543         case ide_cdrom:
1544                 return "cdrom";
1545         case ide_tape:
1546                 return "tape";
1547         case ide_floppy:
1548                 return "floppy";
1549         case ide_optical:
1550                 return "optical";
1551         default:
1552                 return "UNKNOWN";
1553         }
1554 }
1555
1556 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
1557 {
1558         ide_drive_t *drive = to_ide_device(dev);
1559         return sprintf(buf, "%s\n", media_string(drive));
1560 }
1561
1562 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
1563 {
1564         ide_drive_t *drive = to_ide_device(dev);
1565         return sprintf(buf, "%s\n", drive->name);
1566 }
1567
1568 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1569 {
1570         ide_drive_t *drive = to_ide_device(dev);
1571         return sprintf(buf, "ide:m-%s\n", media_string(drive));
1572 }
1573
1574 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
1575                           char *buf)
1576 {
1577         ide_drive_t *drive = to_ide_device(dev);
1578         return sprintf(buf, "%s\n", drive->id->model);
1579 }
1580
1581 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
1582                              char *buf)
1583 {
1584         ide_drive_t *drive = to_ide_device(dev);
1585         return sprintf(buf, "%s\n", drive->id->fw_rev);
1586 }
1587
1588 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
1589                            char *buf)
1590 {
1591         ide_drive_t *drive = to_ide_device(dev);
1592         return sprintf(buf, "%s\n", drive->id->serial_no);
1593 }
1594
1595 static struct device_attribute ide_dev_attrs[] = {
1596         __ATTR_RO(media),
1597         __ATTR_RO(drivename),
1598         __ATTR_RO(modalias),
1599         __ATTR_RO(model),
1600         __ATTR_RO(firmware),
1601         __ATTR(serial, 0400, serial_show, NULL),
1602         __ATTR_NULL
1603 };
1604
1605 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
1606 {
1607         ide_drive_t *drive = to_ide_device(dev);
1608
1609         add_uevent_var(env, "MEDIA=%s", media_string(drive));
1610         add_uevent_var(env, "DRIVENAME=%s", drive->name);
1611         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
1612         return 0;
1613 }
1614
1615 static int generic_ide_probe(struct device *dev)
1616 {
1617         ide_drive_t *drive = to_ide_device(dev);
1618         ide_driver_t *drv = to_ide_driver(dev->driver);
1619
1620         return drv->probe ? drv->probe(drive) : -ENODEV;
1621 }
1622
1623 static int generic_ide_remove(struct device *dev)
1624 {
1625         ide_drive_t *drive = to_ide_device(dev);
1626         ide_driver_t *drv = to_ide_driver(dev->driver);
1627
1628         if (drv->remove)
1629                 drv->remove(drive);
1630
1631         return 0;
1632 }
1633
1634 static void generic_ide_shutdown(struct device *dev)
1635 {
1636         ide_drive_t *drive = to_ide_device(dev);
1637         ide_driver_t *drv = to_ide_driver(dev->driver);
1638
1639         if (dev->driver && drv->shutdown)
1640                 drv->shutdown(drive);
1641 }
1642
1643 struct bus_type ide_bus_type = {
1644         .name           = "ide",
1645         .match          = ide_bus_match,
1646         .uevent         = ide_uevent,
1647         .probe          = generic_ide_probe,
1648         .remove         = generic_ide_remove,
1649         .shutdown       = generic_ide_shutdown,
1650         .dev_attrs      = ide_dev_attrs,
1651         .suspend        = generic_ide_suspend,
1652         .resume         = generic_ide_resume,
1653 };
1654
1655 EXPORT_SYMBOL_GPL(ide_bus_type);
1656
1657 /*
1658  * This is gets invoked once during initialization, to set *everything* up
1659  */
1660 static int __init ide_init(void)
1661 {
1662         int ret;
1663
1664         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver " REVISION "\n");
1665         system_bus_speed = ide_system_bus_speed();
1666
1667         printk(KERN_INFO "ide: Assuming %dMHz system bus speed "
1668                          "for PIO modes%s\n", system_bus_speed,
1669                         idebus_parameter ? "" : "; override with idebus=xx");
1670
1671         ret = bus_register(&ide_bus_type);
1672         if (ret < 0) {
1673                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1674                 return ret;
1675         }
1676
1677         init_ide_data();
1678
1679         proc_ide_create();
1680
1681         return 0;
1682 }
1683
1684 #ifdef MODULE
1685 static char *options = NULL;
1686 module_param(options, charp, 0);
1687 MODULE_LICENSE("GPL");
1688
1689 static void __init parse_options (char *line)
1690 {
1691         char *next = line;
1692
1693         if (line == NULL || !*line)
1694                 return;
1695         while ((line = next) != NULL) {
1696                 if ((next = strchr(line,' ')) != NULL)
1697                         *next++ = 0;
1698                 if (!ide_setup(line))
1699                         printk (KERN_INFO "Unknown option '%s'\n", line);
1700         }
1701 }
1702
1703 int __init init_module (void)
1704 {
1705         parse_options(options);
1706         return ide_init();
1707 }
1708
1709 void __exit cleanup_module (void)
1710 {
1711         int index;
1712
1713         for (index = 0; index < MAX_HWIFS; ++index)
1714                 ide_unregister(index);
1715
1716         proc_ide_destroy();
1717
1718         bus_unregister(&ide_bus_type);
1719 }
1720
1721 #else /* !MODULE */
1722
1723 __setup("", ide_setup);
1724
1725 module_init(ide_init);
1726
1727 #endif /* MODULE */