drivers/ide/ide.c

   1 /*
   2  *  Copyright (C) 1994-1998         Linus Torvalds & authors (see below)
   3  *  Copyrifht (C) 2003-2005, 2007   Bartlomiej Zolnierkiewicz
   4  */
   5
   6 /*
   7  *  Mostly written by Mark Lord  <mlord@pobox.com>
   8  *                and Gadi Oxman <gadio@netvision.net.il>
   9  *                and Andre Hedrick <andre@linux-ide.org>
  10  *
  11  *  See linux/MAINTAINERS for address of current maintainer.
  12  *
  13  * This is the multiple IDE interface driver, as evolved from hd.c.
  14  * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
  15  *   (usually 14 & 15).
  16  * There can be up to two drives per interface, as per the ATA-2 spec.
  17  *
  18  * ...
  19  *
  20  *  From hd.c:
  21  *  |
  22  *  | It traverses the request-list, using interrupts to jump between functions.
  23  *  | As nearly all functions can be called within interrupts, we may not sleep.
  24  *  | Special care is recommended.  Have Fun!
  25  *  |
  26  *  | modified by Drew Eckhardt to check nr of hd's from the CMOS.
  27  *  |
  28  *  | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
  29  *  | in the early extended-partition checks and added DM partitions.
  30  *  |
  31  *  | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
  32  *  |
  33  *  | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
  34  *  | and general streamlining by Mark Lord (mlord@pobox.com).
  35  *
  36  *  October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
  37  *
  38  *      Mark Lord       (mlord@pobox.com)               (IDE Perf.Pkg)
  39  *      Delman Lee      (delman@ieee.org)               ("Mr. atdisk2")
  40  *      Scott Snyder    (snyder@fnald0.fnal.gov)        (ATAPI IDE cd-rom)
  41  *
  42  *  This was a rewrite of just about everything from hd.c, though some original
  43  *  code is still sprinkled about.  Think of it as a major evolution, with
  44  *  inspiration from lots of linux users, esp.  hamish@zot.apana.org.au
  45  */
  46
  47 #define _IDE_C                  /* Tell ide.h it's really us */
  48
  49 #include <linux/module.h>
  50 #include <linux/types.h>
  51 #include <linux/string.h>
  52 #include <linux/kernel.h>
  53 #include <linux/timer.h>
  54 #include <linux/mm.h>
  55 #include <linux/interrupt.h>
  56 #include <linux/major.h>
  57 #include <linux/errno.h>
  58 #include <linux/genhd.h>
  59 #include <linux/blkpg.h>
  60 #include <linux/slab.h>
  61 #include <linux/init.h>
  62 #include <linux/pci.h>
  63 #include <linux/delay.h>
  64 #include <linux/ide.h>
  65 #include <linux/completion.h>
  66 #include <linux/reboot.h>
  67 #include <linux/cdrom.h>
  68 #include <linux/seq_file.h>
  69 #include <linux/device.h>
  70 #include <linux/bitops.h>
  71
  72 #include <asm/byteorder.h>
  73 #include <asm/irq.h>
  74 #include <asm/uaccess.h>
  75 #include <asm/io.h>
  76
  77
  78 /* default maximum number of failures */
  79 #define IDE_DEFAULT_MAX_FAILURES        1
  80
  81 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
  82                                         IDE2_MAJOR, IDE3_MAJOR,
  83                                         IDE4_MAJOR, IDE5_MAJOR,
  84                                         IDE6_MAJOR, IDE7_MAJOR,
  85                                         IDE8_MAJOR, IDE9_MAJOR };
  86
  87 static int idebus_parameter;    /* holds the "idebus=" parameter */
  88 static int system_bus_speed;    /* holds what we think is VESA/PCI bus speed */
  89
  90 DEFINE_MUTEX(ide_cfg_mtx);
  91  __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
  92
  93 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
  94 int ide_scan_direction; /* THIS was formerly 2.2.x pci=reverse */
  95 #endif
  96
  97 int noautodma = 0;
  98
  99 #ifdef CONFIG_BLK_DEV_IDEACPI
 100 int ide_noacpi = 0;
 101 int ide_noacpitfs = 1;
 102 int ide_noacpionboot = 1;
 103 #endif
 104
 105 /*
 106  * This is declared extern in ide.h, for access by other IDE modules:
 107  */
 108 ide_hwif_t ide_hwifs[MAX_HWIFS];        /* master data repository */
 109
 110 EXPORT_SYMBOL(ide_hwifs);
 111
 112 /*
 113  * Do not even *think* about calling this!
 114  */
 115 void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
 116 {
 117         unsigned int unit;
 118
 119         /* bulk initialize hwif & drive info with zeros */
 120         memset(hwif, 0, sizeof(ide_hwif_t));
 121
 122         /* fill in any non-zero initial values */
 123         hwif->index     = index;
 124         hwif->major     = ide_hwif_to_major[index];
 125
 126         hwif->name[0]   = 'i';
 127         hwif->name[1]   = 'd';
 128         hwif->name[2]   = 'e';
 129         hwif->name[3]   = '0' + index;
 130
 131         hwif->bus_state = BUSSTATE_ON;
 132
 133         init_completion(&hwif->gendev_rel_comp);
 134
 135         default_hwif_iops(hwif);
 136         default_hwif_transport(hwif);
 137         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 138                 ide_drive_t *drive = &hwif->drives[unit];
 139
 140                 drive->media                    = ide_disk;
 141                 drive->select.all               = (unit<<4)|0xa0;
 142                 drive->hwif                     = hwif;
 143                 drive->ctl                      = 0x08;
 144                 drive->ready_stat               = READY_STAT;
 145                 drive->bad_wstat                = BAD_W_STAT;
 146                 drive->special.b.recalibrate    = 1;
 147                 drive->special.b.set_geometry   = 1;
 148                 drive->name[0]                  = 'h';
 149                 drive->name[1]                  = 'd';
 150                 drive->name[2]                  = 'a' + (index * MAX_DRIVES) + unit;
 151                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
 152                 drive->using_dma                = 0;
 153                 drive->vdma                     = 0;
 154                 INIT_LIST_HEAD(&drive->list);
 155                 init_completion(&drive->gendev_rel_comp);
 156         }
 157 }
 158 EXPORT_SYMBOL_GPL(ide_init_port_data);
 159
 160 static void init_hwif_default(ide_hwif_t *hwif, unsigned int index)
 161 {
 162         hw_regs_t hw;
 163
 164         memset(&hw, 0, sizeof(hw_regs_t));
 165
 166         ide_init_hwif_ports(&hw, ide_default_io_base(index), 0, &hwif->irq);
 167
 168         memcpy(hwif->io_ports, hw.io_ports, sizeof(hw.io_ports));
 169
 170         hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
 171 #ifdef CONFIG_BLK_DEV_HD
 172         if (hwif->io_ports[IDE_DATA_OFFSET] == HD_DATA)
 173                 hwif->noprobe = 1;      /* may be overridden by ide_setup() */
 174 #endif
 175 }
 176
 177 /*
 178  * init_ide_data() sets reasonable default values into all fields
 179  * of all instances of the hwifs and drives, but only on the first call.
 180  * Subsequent calls have no effect (they don't wipe out anything).
 181  *
 182  * This routine is normally called at driver initialization time,
 183  * but may also be called MUCH earlier during kernel "command-line"
 184  * parameter processing.  As such, we cannot depend on any other parts
 185  * of the kernel (such as memory allocation) to be functioning yet.
 186  *
 187  * This is too bad, as otherwise we could dynamically allocate the
 188  * ide_drive_t structs as needed, rather than always consuming memory
 189  * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
 190  *
 191  * FIXME: We should stuff the setup data into __init and copy the
 192  * relevant hwifs/allocate them properly during boot.
 193  */
 194 #define MAGIC_COOKIE 0x12345678
 195 static void __init init_ide_data (void)
 196 {
 197         ide_hwif_t *hwif;
 198         unsigned int index;
 199         static unsigned long magic_cookie = MAGIC_COOKIE;
 200
 201         if (magic_cookie != MAGIC_COOKIE)
 202                 return;         /* already initialized */
 203         magic_cookie = 0;
 204
 205         /* Initialise all interface structures */
 206         for (index = 0; index < MAX_HWIFS; ++index) {
 207                 hwif = &ide_hwifs[index];
 208                 ide_init_port_data(hwif, index);
 209                 init_hwif_default(hwif, index);
 210 #if !defined(CONFIG_PPC32) || !defined(CONFIG_PCI)
 211                 hwif->irq =
 212                         ide_init_default_irq(hwif->io_ports[IDE_DATA_OFFSET]);
 213 #endif
 214         }
 215 }
 216
 217 /**
 218  *      ide_system_bus_speed    -       guess bus speed
 219  *
 220  *      ide_system_bus_speed() returns what we think is the system VESA/PCI
 221  *      bus speed (in MHz). This is used for calculating interface PIO timings.
 222  *      The default is 40 for known PCI systems, 50 otherwise.
 223  *      The "idebus=xx" parameter can be used to override this value.
 224  *      The actual value to be used is computed/displayed the first time
 225  *      through. Drivers should only use this as a last resort.
 226  *
 227  *      Returns a guessed speed in MHz.
 228  */
 229
 230 static int ide_system_bus_speed(void)
 231 {
 232 #ifdef CONFIG_PCI
 233         static struct pci_device_id pci_default[] = {
 234                 { PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID) },
 235                 { }
 236         };
 237 #else
 238 #define pci_default 0
 239 #endif /* CONFIG_PCI */
 240
 241         /* user supplied value */
 242         if (idebus_parameter)
 243                 return idebus_parameter;
 244
 245         /* safe default value for PCI or VESA and PCI*/
 246         return pci_dev_present(pci_default) ? 33 : 50;
 247 }
 248
 249 ide_hwif_t * ide_find_port(unsigned long base)
 250 {
 251         ide_hwif_t *hwif;
 252         int i;
 253
 254         for (i = 0; i < MAX_HWIFS; i++) {
 255                 hwif = &ide_hwifs[i];
 256                 if (hwif->io_ports[IDE_DATA_OFFSET] == base)
 257                         goto found;
 258         }
 259
 260         for (i = 0; i < MAX_HWIFS; i++) {
 261                 hwif = &ide_hwifs[i];
 262                 if (hwif->io_ports[IDE_DATA_OFFSET] == 0)
 263                         goto found;
 264         }
 265
 266         hwif = NULL;
 267 found:
 268         return hwif;
 269 }
 270
 271 EXPORT_SYMBOL_GPL(ide_find_port);
 272
 273 static struct resource* hwif_request_region(ide_hwif_t *hwif,
 274                                             unsigned long addr, int num)
 275 {
 276         struct resource *res = request_region(addr, num, hwif->name);
 277
 278         if (!res)
 279                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
 280                                 hwif->name, addr, addr+num-1);
 281         return res;
 282 }
 283
 284 /**
 285  *      ide_hwif_request_regions - request resources for IDE
 286  *      @hwif: interface to use
 287  *
 288  *      Requests all the needed resources for an interface.
 289  *      Right now core IDE code does this work which is deeply wrong.
 290  *      MMIO leaves it to the controller driver,
 291  *      PIO will migrate this way over time.
 292  */
 293
 294 int ide_hwif_request_regions(ide_hwif_t *hwif)
 295 {
 296         unsigned long addr;
 297         unsigned int i;
 298
 299         if (hwif->mmio)
 300                 return 0;
 301         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 302         if (addr && !hwif_request_region(hwif, addr, 1))
 303                 goto control_region_busy;
 304         hwif->straight8 = 0;
 305         addr = hwif->io_ports[IDE_DATA_OFFSET];
 306         if ((addr | 7) == hwif->io_ports[IDE_STATUS_OFFSET]) {
 307                 if (!hwif_request_region(hwif, addr, 8))
 308                         goto data_region_busy;
 309                 hwif->straight8 = 1;
 310                 return 0;
 311         }
 312         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
 313                 addr = hwif->io_ports[i];
 314                 if (!hwif_request_region(hwif, addr, 1)) {
 315                         while (--i)
 316                                 release_region(addr, 1);
 317                         goto data_region_busy;
 318                 }
 319         }
 320         return 0;
 321
 322 data_region_busy:
 323         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 324         if (addr)
 325                 release_region(addr, 1);
 326 control_region_busy:
 327         /* If any errors are return, we drop the hwif interface. */
 328         return -EBUSY;
 329 }
 330
 331 /**
 332  *      ide_hwif_release_regions - free IDE resources
 333  *
 334  *      Note that we only release the standard ports,
 335  *      and do not even try to handle any extra ports
 336  *      allocated for weird IDE interface chipsets.
 337  *
 338  *      Note also that we don't yet handle mmio resources here. More
 339  *      importantly our caller should be doing this so we need to
 340  *      restructure this as a helper function for drivers.
 341  */
 342
 343 void ide_hwif_release_regions(ide_hwif_t *hwif)
 344 {
 345         u32 i = 0;
 346
 347         if (hwif->mmio)
 348                 return;
 349         if (hwif->io_ports[IDE_CONTROL_OFFSET])
 350                 release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
 351         if (hwif->straight8) {
 352                 release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
 353                 return;
 354         }
 355         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
 356                 if (hwif->io_ports[i])
 357                         release_region(hwif->io_ports[i], 1);
 358 }
 359
 360 /**
 361  *      ide_hwif_restore        -       restore hwif to template
 362  *      @hwif: hwif to update
 363  *      @tmp_hwif: template
 364  *
 365  *      Restore hwif to a previous state by copying most settings
 366  *      from the template.
 367  */
 368
 369 static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
 370 {
 371         hwif->hwgroup                   = tmp_hwif->hwgroup;
 372
 373         hwif->gendev.parent             = tmp_hwif->gendev.parent;
 374
 375         hwif->proc                      = tmp_hwif->proc;
 376
 377         hwif->major                     = tmp_hwif->major;
 378         hwif->straight8                 = tmp_hwif->straight8;
 379         hwif->bus_state                 = tmp_hwif->bus_state;
 380
 381         hwif->host_flags                = tmp_hwif->host_flags;
 382
 383         hwif->pio_mask                  = tmp_hwif->pio_mask;
 384
 385         hwif->ultra_mask                = tmp_hwif->ultra_mask;
 386         hwif->mwdma_mask                = tmp_hwif->mwdma_mask;
 387         hwif->swdma_mask                = tmp_hwif->swdma_mask;
 388
 389         hwif->cbl                       = tmp_hwif->cbl;
 390
 391         hwif->chipset                   = tmp_hwif->chipset;
 392         hwif->hold                      = tmp_hwif->hold;
 393
 394         hwif->dev                       = tmp_hwif->dev;
 395
 396 #ifdef CONFIG_BLK_DEV_IDEPCI
 397         hwif->cds                       = tmp_hwif->cds;
 398 #endif
 399
 400         hwif->set_pio_mode              = tmp_hwif->set_pio_mode;
 401         hwif->set_dma_mode              = tmp_hwif->set_dma_mode;
 402         hwif->mdma_filter               = tmp_hwif->mdma_filter;
 403         hwif->udma_filter               = tmp_hwif->udma_filter;
 404         hwif->selectproc                = tmp_hwif->selectproc;
 405         hwif->reset_poll                = tmp_hwif->reset_poll;
 406         hwif->pre_reset                 = tmp_hwif->pre_reset;
 407         hwif->resetproc                 = tmp_hwif->resetproc;
 408         hwif->maskproc                  = tmp_hwif->maskproc;
 409         hwif->quirkproc                 = tmp_hwif->quirkproc;
 410         hwif->busproc                   = tmp_hwif->busproc;
 411
 412         hwif->ata_input_data            = tmp_hwif->ata_input_data;
 413         hwif->ata_output_data           = tmp_hwif->ata_output_data;
 414         hwif->atapi_input_bytes         = tmp_hwif->atapi_input_bytes;
 415         hwif->atapi_output_bytes        = tmp_hwif->atapi_output_bytes;
 416
 417         hwif->dma_host_set              = tmp_hwif->dma_host_set;
 418         hwif->dma_setup                 = tmp_hwif->dma_setup;
 419         hwif->dma_exec_cmd              = tmp_hwif->dma_exec_cmd;
 420         hwif->dma_start                 = tmp_hwif->dma_start;
 421         hwif->ide_dma_end               = tmp_hwif->ide_dma_end;
 422         hwif->ide_dma_test_irq          = tmp_hwif->ide_dma_test_irq;
 423         hwif->ide_dma_clear_irq         = tmp_hwif->ide_dma_clear_irq;
 424         hwif->dma_lost_irq              = tmp_hwif->dma_lost_irq;
 425         hwif->dma_timeout               = tmp_hwif->dma_timeout;
 426
 427         hwif->OUTB                      = tmp_hwif->OUTB;
 428         hwif->OUTBSYNC                  = tmp_hwif->OUTBSYNC;
 429         hwif->OUTW                      = tmp_hwif->OUTW;
 430         hwif->OUTSW                     = tmp_hwif->OUTSW;
 431         hwif->OUTSL                     = tmp_hwif->OUTSL;
 432
 433         hwif->INB                       = tmp_hwif->INB;
 434         hwif->INW                       = tmp_hwif->INW;
 435         hwif->INSW                      = tmp_hwif->INSW;
 436         hwif->INSL                      = tmp_hwif->INSL;
 437
 438         hwif->sg_max_nents              = tmp_hwif->sg_max_nents;
 439
 440         hwif->mmio                      = tmp_hwif->mmio;
 441         hwif->rqsize                    = tmp_hwif->rqsize;
 442
 443 #ifndef CONFIG_BLK_DEV_IDECS
 444         hwif->irq                       = tmp_hwif->irq;
 445 #endif
 446
 447         hwif->dma_base                  = tmp_hwif->dma_base;
 448         hwif->dma_command               = tmp_hwif->dma_command;
 449         hwif->dma_vendor1               = tmp_hwif->dma_vendor1;
 450         hwif->dma_status                = tmp_hwif->dma_status;
 451         hwif->dma_vendor3               = tmp_hwif->dma_vendor3;
 452         hwif->dma_prdtable              = tmp_hwif->dma_prdtable;
 453
 454         hwif->config_data               = tmp_hwif->config_data;
 455         hwif->select_data               = tmp_hwif->select_data;
 456         hwif->extra_base                = tmp_hwif->extra_base;
 457         hwif->extra_ports               = tmp_hwif->extra_ports;
 458
 459         hwif->hwif_data                 = tmp_hwif->hwif_data;
 460 }
 461
 462 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
 463 {
 464         ide_hwgroup_t *hwgroup = hwif->hwgroup;
 465
 466         spin_lock_irq(&ide_lock);
 467         /*
 468          * Remove us from the hwgroup, and free
 469          * the hwgroup if we were the only member
 470          */
 471         if (hwif->next == hwif) {
 472                 BUG_ON(hwgroup->hwif != hwif);
 473                 kfree(hwgroup);
 474         } else {
 475                 /* There is another interface in hwgroup.
 476                  * Unlink us, and set hwgroup->drive and ->hwif to
 477                  * something sane.
 478                  */
 479                 ide_hwif_t *g = hwgroup->hwif;
 480
 481                 while (g->next != hwif)
 482                         g = g->next;
 483                 g->next = hwif->next;
 484                 if (hwgroup->hwif == hwif) {
 485                         /* Chose a random hwif for hwgroup->hwif.
 486                          * It's guaranteed that there are no drives
 487                          * left in the hwgroup.
 488                          */
 489                         BUG_ON(hwgroup->drive != NULL);
 490                         hwgroup->hwif = g;
 491                 }
 492                 BUG_ON(hwgroup->hwif == hwif);
 493         }
 494         spin_unlock_irq(&ide_lock);
 495 }
 496
 497 /**
 498  *      ide_unregister          -       free an IDE interface
 499  *      @index: index of interface (will change soon to a pointer)
 500  *      @init_default: init default hwif flag
 501  *      @restore: restore hwif flag
 502  *
 503  *      Perform the final unregister of an IDE interface. At the moment
 504  *      we don't refcount interfaces so this will also get split up.
 505  *
 506  *      Locking:
 507  *      The caller must not hold the IDE locks
 508  *      The drive present/vanishing is not yet properly locked
 509  *      Take care with the callbacks. These have been split to avoid
 510  *      deadlocking the IDE layer. The shutdown callback is called
 511  *      before we take the lock and free resources. It is up to the
 512  *      caller to be sure there is no pending I/O here, and that
 513  *      the interface will not be reopened (present/vanishing locking
 514  *      isn't yet done BTW). After we commit to the final kill we
 515  *      call the cleanup callback with the ide locks held.
 516  *
 517  *      Unregister restores the hwif structures to the default state.
 518  *      This is raving bonkers.
 519  */
 520
 521 void ide_unregister(unsigned int index, int init_default, int restore)
 522 {
 523         ide_drive_t *drive;
 524         ide_hwif_t *hwif, *g;
 525         static ide_hwif_t tmp_hwif; /* protected by ide_cfg_mtx */
 526         ide_hwgroup_t *hwgroup;
 527         int irq_count = 0, unit;
 528
 529         BUG_ON(index >= MAX_HWIFS);
 530
 531         BUG_ON(in_interrupt());
 532         BUG_ON(irqs_disabled());
 533         mutex_lock(&ide_cfg_mtx);
 534         spin_lock_irq(&ide_lock);
 535         hwif = &ide_hwifs[index];
 536         if (!hwif->present)
 537                 goto abort;
 538         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 539                 drive = &hwif->drives[unit];
 540                 if (!drive->present)
 541                         continue;
 542                 spin_unlock_irq(&ide_lock);
 543                 device_unregister(&drive->gendev);
 544                 wait_for_completion(&drive->gendev_rel_comp);
 545                 spin_lock_irq(&ide_lock);
 546         }
 547         hwif->present = 0;
 548
 549         spin_unlock_irq(&ide_lock);
 550
 551         ide_proc_unregister_port(hwif);
 552
 553         hwgroup = hwif->hwgroup;
 554         /*
 555          * free the irq if we were the only hwif using it
 556          */
 557         g = hwgroup->hwif;
 558         do {
 559                 if (g->irq == hwif->irq)
 560                         ++irq_count;
 561                 g = g->next;
 562         } while (g != hwgroup->hwif);
 563         if (irq_count == 1)
 564                 free_irq(hwif->irq, hwgroup);
 565
 566         ide_remove_port_from_hwgroup(hwif);
 567
 568         device_unregister(&hwif->gendev);
 569         wait_for_completion(&hwif->gendev_rel_comp);
 570
 571         /*
 572          * Remove us from the kernel's knowledge
 573          */
 574         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 575         kfree(hwif->sg_table);
 576         unregister_blkdev(hwif->major, hwif->name);
 577         spin_lock_irq(&ide_lock);
 578
 579         if (hwif->dma_base) {
 580                 (void) ide_release_dma(hwif);
 581
 582                 hwif->dma_base = 0;
 583                 hwif->dma_command = 0;
 584                 hwif->dma_vendor1 = 0;
 585                 hwif->dma_status = 0;
 586                 hwif->dma_vendor3 = 0;
 587                 hwif->dma_prdtable = 0;
 588
 589                 hwif->extra_base  = 0;
 590                 hwif->extra_ports = 0;
 591         }
 592
 593         ide_hwif_release_regions(hwif);
 594
 595         /* copy original settings */
 596         tmp_hwif = *hwif;
 597
 598         /* restore hwif data to pristine status */
 599         ide_init_port_data(hwif, index);
 600
 601         if (init_default)
 602                 init_hwif_default(hwif, index);
 603
 604         if (restore)
 605                 ide_hwif_restore(hwif, &tmp_hwif);
 606
 607 abort:
 608         spin_unlock_irq(&ide_lock);
 609         mutex_unlock(&ide_cfg_mtx);
 610 }
 611
 612 EXPORT_SYMBOL(ide_unregister);
 613
 614 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
 615 {
 616         memcpy(hwif->io_ports, hw->io_ports, sizeof(hwif->io_ports));
 617         hwif->irq = hw->irq;
 618         hwif->noprobe = 0;
 619         hwif->chipset = hw->chipset;
 620         hwif->gendev.parent = hw->dev;
 621         hwif->ack_intr = hw->ack_intr;
 622 }
 623 EXPORT_SYMBOL_GPL(ide_init_port_hw);
 624
 625 ide_hwif_t *ide_deprecated_find_port(unsigned long base)
 626 {
 627         ide_hwif_t *hwif;
 628         int i;
 629
 630         for (i = 0; i < MAX_HWIFS; i++) {
 631                 hwif = &ide_hwifs[i];
 632                 if (hwif->io_ports[IDE_DATA_OFFSET] == base)
 633                         goto found;
 634         }
 635
 636         for (i = 0; i < MAX_HWIFS; i++) {
 637                 hwif = &ide_hwifs[i];
 638                 if (hwif->hold)
 639                         continue;
 640                 if (!hwif->present && hwif->mate == NULL)
 641                         goto found;
 642         }
 643
 644         hwif = NULL;
 645 found:
 646         return hwif;
 647 }
 648 EXPORT_SYMBOL_GPL(ide_deprecated_find_port);
 649
 650 /**
 651  *      ide_register_hw         -       register IDE interface
 652  *      @hw: hardware registers
 653  *      @quirkproc: quirkproc function
 654  *      @hwifp: pointer to returned hwif
 655  *
 656  *      Register an IDE interface, specifying exactly the registers etc.
 657  *
 658  *      Returns -1 on error.
 659  */
 660
 661 int ide_register_hw(hw_regs_t *hw, void (*quirkproc)(ide_drive_t *),
 662                     ide_hwif_t **hwifp)
 663 {
 664         int index, retry = 1;
 665         ide_hwif_t *hwif;
 666         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
 667
 668         do {
 669                 hwif = ide_deprecated_find_port(hw->io_ports[IDE_DATA_OFFSET]);
 670                 if (hwif)
 671                         goto found;
 672                 for (index = 0; index < MAX_HWIFS; index++)
 673                         ide_unregister(index, 1, 1);
 674         } while (retry--);
 675         return -1;
 676 found:
 677         index = hwif->index;
 678         if (hwif->present)
 679                 ide_unregister(index, 0, 1);
 680         else if (!hwif->hold)
 681                 ide_init_port_data(hwif, index);
 682
 683         ide_init_port_hw(hwif, hw);
 684         hwif->quirkproc = quirkproc;
 685
 686         idx[0] = index;
 687
 688         ide_device_add(idx, NULL);
 689
 690         if (hwifp)
 691                 *hwifp = hwif;
 692
 693         return hwif->present ? index : -1;
 694 }
 695
 696 EXPORT_SYMBOL(ide_register_hw);
 697
 698 /*
 699  *      Locks for IDE setting functionality
 700  */
 701
 702 DEFINE_MUTEX(ide_setting_mtx);
 703
 704 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 705
 706 /**
 707  *      ide_spin_wait_hwgroup   -       wait for group
 708  *      @drive: drive in the group
 709  *
 710  *      Wait for an IDE device group to go non busy and then return
 711  *      holding the ide_lock which guards the hwgroup->busy status
 712  *      and right to use it.
 713  */
 714
 715 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 716 {
 717         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 718         unsigned long timeout = jiffies + (3 * HZ);
 719
 720         spin_lock_irq(&ide_lock);
 721
 722         while (hwgroup->busy) {
 723                 unsigned long lflags;
 724                 spin_unlock_irq(&ide_lock);
 725                 local_irq_set(lflags);
 726                 if (time_after(jiffies, timeout)) {
 727                         local_irq_restore(lflags);
 728                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 729                         return -EBUSY;
 730                 }
 731                 local_irq_restore(lflags);
 732                 spin_lock_irq(&ide_lock);
 733         }
 734         return 0;
 735 }
 736
 737 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 738
 739 int set_io_32bit(ide_drive_t *drive, int arg)
 740 {
 741         if (drive->no_io_32bit)
 742                 return -EPERM;
 743
 744         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 745                 return -EINVAL;
 746
 747         if (ide_spin_wait_hwgroup(drive))
 748                 return -EBUSY;
 749
 750         drive->io_32bit = arg;
 751
 752         spin_unlock_irq(&ide_lock);
 753
 754         return 0;
 755 }
 756
 757 static int set_ksettings(ide_drive_t *drive, int arg)
 758 {
 759         if (arg < 0 || arg > 1)
 760                 return -EINVAL;
 761
 762         if (ide_spin_wait_hwgroup(drive))
 763                 return -EBUSY;
 764         drive->keep_settings = arg;
 765         spin_unlock_irq(&ide_lock);
 766
 767         return 0;
 768 }
 769
 770 int set_using_dma(ide_drive_t *drive, int arg)
 771 {
 772 #ifdef CONFIG_BLK_DEV_IDEDMA
 773         ide_hwif_t *hwif = drive->hwif;
 774         int err = -EPERM;
 775
 776         if (arg < 0 || arg > 1)
 777                 return -EINVAL;
 778
 779         if (!drive->id || !(drive->id->capability & 1))
 780                 goto out;
 781
 782         if (hwif->dma_host_set == NULL)
 783                 goto out;
 784
 785         err = -EBUSY;
 786         if (ide_spin_wait_hwgroup(drive))
 787                 goto out;
 788         /*
 789          * set ->busy flag, unlock and let it ride
 790          */
 791         hwif->hwgroup->busy = 1;
 792         spin_unlock_irq(&ide_lock);
 793
 794         err = 0;
 795
 796         if (arg) {
 797                 if (ide_set_dma(drive))
 798                         err = -EIO;
 799         } else
 800                 ide_dma_off(drive);
 801
 802         /*
 803          * lock, clear ->busy flag and unlock before leaving
 804          */
 805         spin_lock_irq(&ide_lock);
 806         hwif->hwgroup->busy = 0;
 807         spin_unlock_irq(&ide_lock);
 808 out:
 809         return err;
 810 #else
 811         if (arg < 0 || arg > 1)
 812                 return -EINVAL;
 813
 814         return -EPERM;
 815 #endif
 816 }
 817
 818 int set_pio_mode(ide_drive_t *drive, int arg)
 819 {
 820         struct request rq;
 821
 822         if (arg < 0 || arg > 255)
 823                 return -EINVAL;
 824
 825         if (drive->hwif->set_pio_mode == NULL)
 826                 return -ENOSYS;
 827
 828         if (drive->special.b.set_tune)
 829                 return -EBUSY;
 830
 831         ide_init_drive_cmd(&rq);
 832         rq.cmd_type = REQ_TYPE_ATA_TASKFILE;
 833
 834         drive->tune_req = (u8) arg;
 835         drive->special.b.set_tune = 1;
 836         (void) ide_do_drive_cmd(drive, &rq, ide_wait);
 837         return 0;
 838 }
 839
 840 static int set_unmaskirq(ide_drive_t *drive, int arg)
 841 {
 842         if (drive->no_unmask)
 843                 return -EPERM;
 844
 845         if (arg < 0 || arg > 1)
 846                 return -EINVAL;
 847
 848         if (ide_spin_wait_hwgroup(drive))
 849                 return -EBUSY;
 850         drive->unmask = arg;
 851         spin_unlock_irq(&ide_lock);
 852
 853         return 0;
 854 }
 855
 856 /**
 857  *      system_bus_clock        -       clock guess
 858  *
 859  *      External version of the bus clock guess used by very old IDE drivers
 860  *      for things like VLB timings. Should not be used.
 861  */
 862
 863 int system_bus_clock (void)
 864 {
 865         return system_bus_speed;
 866 }
 867
 868 EXPORT_SYMBOL(system_bus_clock);
 869
 870 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 871 {
 872         ide_drive_t *drive = dev->driver_data;
 873         ide_hwif_t *hwif = HWIF(drive);
 874         struct request rq;
 875         struct request_pm_state rqpm;
 876         ide_task_t args;
 877         int ret;
 878
 879         /* Call ACPI _GTM only once */
 880         if (!(drive->dn % 2))
 881                 ide_acpi_get_timing(hwif);
 882
 883         memset(&rq, 0, sizeof(rq));
 884         memset(&rqpm, 0, sizeof(rqpm));
 885         memset(&args, 0, sizeof(args));
 886         rq.cmd_type = REQ_TYPE_PM_SUSPEND;
 887         rq.special = &args;
 888         rq.data = &rqpm;
 889         rqpm.pm_step = ide_pm_state_start_suspend;
 890         if (mesg.event == PM_EVENT_PRETHAW)
 891                 mesg.event = PM_EVENT_FREEZE;
 892         rqpm.pm_state = mesg.event;
 893
 894         ret = ide_do_drive_cmd(drive, &rq, ide_wait);
 895         /* only call ACPI _PS3 after both drivers are suspended */
 896         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 897                  && hwif->drives[1].present)
 898                  || !hwif->drives[0].present
 899                  || !hwif->drives[1].present))
 900                 ide_acpi_set_state(hwif, 0);
 901         return ret;
 902 }
 903
 904 static int generic_ide_resume(struct device *dev)
 905 {
 906         ide_drive_t *drive = dev->driver_data;
 907         ide_hwif_t *hwif = HWIF(drive);
 908         struct request rq;
 909         struct request_pm_state rqpm;
 910         ide_task_t args;
 911         int err;
 912
 913         /* Call ACPI _STM only once */
 914         if (!(drive->dn % 2)) {
 915                 ide_acpi_set_state(hwif, 1);
 916                 ide_acpi_push_timing(hwif);
 917         }
 918
 919         ide_acpi_exec_tfs(drive);
 920
 921         memset(&rq, 0, sizeof(rq));
 922         memset(&rqpm, 0, sizeof(rqpm));
 923         memset(&args, 0, sizeof(args));
 924         rq.cmd_type = REQ_TYPE_PM_RESUME;
 925         rq.special = &args;
 926         rq.data = &rqpm;
 927         rqpm.pm_step = ide_pm_state_start_resume;
 928         rqpm.pm_state = PM_EVENT_ON;
 929
 930         err = ide_do_drive_cmd(drive, &rq, ide_head_wait);
 931
 932         if (err == 0 && dev->driver) {
 933                 ide_driver_t *drv = to_ide_driver(dev->driver);
 934
 935                 if (drv->resume)
 936                         drv->resume(drive);
 937         }
 938
 939         return err;
 940 }
 941
 942 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 943                         unsigned int cmd, unsigned long arg)
 944 {
 945         unsigned long flags;
 946         ide_driver_t *drv;
 947         void __user *p = (void __user *)arg;
 948         int err = 0, (*setfunc)(ide_drive_t *, int);
 949         u8 *val;
 950
 951         switch (cmd) {
 952         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
 953         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
 954         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
 955         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
 956         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
 957         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
 958         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
 959         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
 960         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
 961         }
 962
 963         switch (cmd) {
 964                 case HDIO_OBSOLETE_IDENTITY:
 965                 case HDIO_GET_IDENTITY:
 966                         if (bdev != bdev->bd_contains)
 967                                 return -EINVAL;
 968                         if (drive->id_read == 0)
 969                                 return -ENOMSG;
 970                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
 971                                 return -EFAULT;
 972                         return 0;
 973
 974                 case HDIO_GET_NICE:
 975                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
 976                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
 977                                         drive->nice1 << IDE_NICE_1,
 978                                         (long __user *) arg);
 979 #ifdef CONFIG_IDE_TASK_IOCTL
 980                 case HDIO_DRIVE_TASKFILE:
 981                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 982                                 return -EACCES;
 983                         switch(drive->media) {
 984                                 case ide_disk:
 985                                         return ide_taskfile_ioctl(drive, cmd, arg);
 986                                 default:
 987                                         return -ENOMSG;
 988                         }
 989 #endif /* CONFIG_IDE_TASK_IOCTL */
 990
 991                 case HDIO_DRIVE_CMD:
 992                         if (!capable(CAP_SYS_RAWIO))
 993                                 return -EACCES;
 994                         return ide_cmd_ioctl(drive, cmd, arg);
 995
 996                 case HDIO_DRIVE_TASK:
 997                         if (!capable(CAP_SYS_RAWIO))
 998                                 return -EACCES;
 999                         return ide_task_ioctl(drive, cmd, arg);
1000
1001                 case HDIO_SCAN_HWIF:
1002                 {
1003                         hw_regs_t hw;
1004                         int args[3];
1005                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1006                         if (copy_from_user(args, p, 3 * sizeof(int)))
1007                                 return -EFAULT;
1008                         memset(&hw, 0, sizeof(hw));
1009                         ide_init_hwif_ports(&hw, (unsigned long) args[0],
1010                                             (unsigned long) args[1], NULL);
1011                         hw.irq = args[2];
1012                         if (ide_register_hw(&hw, NULL, NULL) == -1)
1013                                 return -EIO;
1014                         return 0;
1015                 }
1016                 case HDIO_UNREGISTER_HWIF:
1017                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1018                         /* (arg > MAX_HWIFS) checked in function */
1019                         ide_unregister(arg, 1, 1);
1020                         return 0;
1021                 case HDIO_SET_NICE:
1022                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1023                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
1024                                 return -EPERM;
1025                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
1026                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
1027                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
1028                                 drive->dsc_overlap = 0;
1029                                 return -EPERM;
1030                         }
1031                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
1032                         return 0;
1033                 case HDIO_DRIVE_RESET:
1034                         if (!capable(CAP_SYS_ADMIN))
1035                                 return -EACCES;
1036
1037                         /*
1038                          *      Abort the current command on the
1039                          *      group if there is one, taking
1040                          *      care not to allow anything else
1041                          *      to be queued and to die on the
1042                          *      spot if we miss one somehow
1043                          */
1044
1045                         spin_lock_irqsave(&ide_lock, flags);
1046
1047                         if (HWGROUP(drive)->resetting) {
1048                                 spin_unlock_irqrestore(&ide_lock, flags);
1049                                 return -EBUSY;
1050                         }
1051
1052                         ide_abort(drive, "drive reset");
1053
1054                         BUG_ON(HWGROUP(drive)->handler);
1055
1056                         /* Ensure nothing gets queued after we
1057                            drop the lock. Reset will clear the busy */
1058
1059                         HWGROUP(drive)->busy = 1;
1060                         spin_unlock_irqrestore(&ide_lock, flags);
1061                         (void) ide_do_reset(drive);
1062
1063                         return 0;
1064                 case HDIO_GET_BUSSTATE:
1065                         if (!capable(CAP_SYS_ADMIN))
1066                                 return -EACCES;
1067                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
1068                                 return -EFAULT;
1069                         return 0;
1070
1071                 case HDIO_SET_BUSSTATE:
1072                         if (!capable(CAP_SYS_ADMIN))
1073                                 return -EACCES;
1074                         if (HWIF(drive)->busproc)
1075                                 return HWIF(drive)->busproc(drive, (int)arg);
1076                         return -EOPNOTSUPP;
1077                 default:
1078                         return -EINVAL;
1079         }
1080
1081 read_val:
1082         mutex_lock(&ide_setting_mtx);
1083         spin_lock_irqsave(&ide_lock, flags);
1084         err = *val;
1085         spin_unlock_irqrestore(&ide_lock, flags);
1086         mutex_unlock(&ide_setting_mtx);
1087         return err >= 0 ? put_user(err, (long __user *)arg) : err;
1088
1089 set_val:
1090         if (bdev != bdev->bd_contains)
1091                 err = -EINVAL;
1092         else {
1093                 if (!capable(CAP_SYS_ADMIN))
1094                         err = -EACCES;
1095                 else {
1096                         mutex_lock(&ide_setting_mtx);
1097                         err = setfunc(drive, arg);
1098                         mutex_unlock(&ide_setting_mtx);
1099                 }
1100         }
1101         return err;
1102 }
1103
1104 EXPORT_SYMBOL(generic_ide_ioctl);
1105
1106 /*
1107  * stridx() returns the offset of c within s,
1108  * or -1 if c is '\0' or not found within s.
1109  */
1110 static int __init stridx (const char *s, char c)
1111 {
1112         char *i = strchr(s, c);
1113         return (i && c) ? i - s : -1;
1114 }
1115
1116 /*
1117  * match_parm() does parsing for ide_setup():
1118  *
1119  * 1. the first char of s must be '='.
1120  * 2. if the remainder matches one of the supplied keywords,
1121  *     the index (1 based) of the keyword is negated and returned.
1122  * 3. if the remainder is a series of no more than max_vals numbers
1123  *     separated by commas, the numbers are saved in vals[] and a
1124  *     count of how many were saved is returned.  Base10 is assumed,
1125  *     and base16 is allowed when prefixed with "0x".
1126  * 4. otherwise, zero is returned.
1127  */
1128 static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
1129 {
1130         static const char *decimal = "0123456789";
1131         static const char *hex = "0123456789abcdef";
1132         int i, n;
1133
1134         if (*s++ == '=') {
1135                 /*
1136                  * Try matching against the supplied keywords,
1137                  * and return -(index+1) if we match one
1138                  */
1139                 if (keywords != NULL) {
1140                         for (i = 0; *keywords != NULL; ++i) {
1141                                 if (!strcmp(s, *keywords++))
1142                                         return -(i+1);
1143                         }
1144                 }
1145                 /*
1146                  * Look for a series of no more than "max_vals"
1147                  * numeric values separated by commas, in base10,
1148                  * or base16 when prefixed with "0x".
1149                  * Return a count of how many were found.
1150                  */
1151                 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
1152                         vals[n] = i;
1153                         while ((i = stridx(decimal, *++s)) >= 0)
1154                                 vals[n] = (vals[n] * 10) + i;
1155                         if (*s == 'x' && !vals[n]) {
1156                                 while ((i = stridx(hex, *++s)) >= 0)
1157                                         vals[n] = (vals[n] * 0x10) + i;
1158                         }
1159                         if (++n == max_vals)
1160                                 break;
1161                         if (*s == ',' || *s == ';')
1162                                 ++s;
1163                 }
1164                 if (!*s)
1165                         return n;
1166         }
1167         return 0;       /* zero = nothing matched */
1168 }
1169
1170 extern int probe_ali14xx;
1171 extern int probe_umc8672;
1172 extern int probe_dtc2278;
1173 extern int probe_ht6560b;
1174 extern int probe_qd65xx;
1175 extern int cmd640_vlb;
1176
1177 static int __initdata is_chipset_set[MAX_HWIFS];
1178
1179 /*
1180  * ide_setup() gets called VERY EARLY during initialization,
1181  * to handle kernel "command line" strings beginning with "hdx=" or "ide".
1182  *
1183  * Remember to update Documentation/ide/ide.txt if you change something here.
1184  */
1185 static int __init ide_setup(char *s)
1186 {
1187         int i, vals[3];
1188         ide_hwif_t *hwif;
1189         ide_drive_t *drive;
1190         unsigned int hw, unit;
1191         const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
1192         const char max_hwif  = '0' + (MAX_HWIFS - 1);
1193
1194
1195         if (strncmp(s,"hd",2) == 0 && s[2] == '=')      /* hd= is for hd.c   */
1196                 return 0;                               /* driver and not us */
1197
1198         if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
1199                 return 0;
1200
1201         printk(KERN_INFO "ide_setup: %s", s);
1202         init_ide_data ();
1203
1204 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
1205         if (!strcmp(s, "ide=doubler")) {
1206                 extern int ide_doubler;
1207
1208                 printk(" : Enabled support for IDE doublers\n");
1209                 ide_doubler = 1;
1210                 return 1;
1211         }
1212 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
1213
1214         if (!strcmp(s, "ide=nodma")) {
1215                 printk(" : Prevented DMA\n");
1216                 noautodma = 1;
1217                 goto obsolete_option;
1218         }
1219
1220 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
1221         if (!strcmp(s, "ide=reverse")) {
1222                 ide_scan_direction = 1;
1223                 printk(" : Enabled support for IDE inverse scan order.\n");
1224                 goto obsolete_option;
1225         }
1226 #endif
1227
1228 #ifdef CONFIG_BLK_DEV_IDEACPI
1229         if (!strcmp(s, "ide=noacpi")) {
1230                 //printk(" : Disable IDE ACPI support.\n");
1231                 ide_noacpi = 1;
1232                 return 1;
1233         }
1234         if (!strcmp(s, "ide=acpigtf")) {
1235                 //printk(" : Enable IDE ACPI _GTF support.\n");
1236                 ide_noacpitfs = 0;
1237                 return 1;
1238         }
1239         if (!strcmp(s, "ide=acpionboot")) {
1240                 //printk(" : Call IDE ACPI methods on boot.\n");
1241                 ide_noacpionboot = 0;
1242                 return 1;
1243         }
1244 #endif /* CONFIG_BLK_DEV_IDEACPI */
1245
1246         /*
1247          * Look for drive options:  "hdx="
1248          */
1249         if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
1250                 const char *hd_words[] = {
1251                         "none", "noprobe", "nowerr", "cdrom", "nodma",
1252                         "autotune", "noautotune", "-8", "-9", "-10",
1253                         "noflush", "remap", "remap63", "scsi", NULL };
1254                 unit = s[2] - 'a';
1255                 hw   = unit / MAX_DRIVES;
1256                 unit = unit % MAX_DRIVES;
1257                 hwif = &ide_hwifs[hw];
1258                 drive = &hwif->drives[unit];
1259                 if (strncmp(s + 4, "ide-", 4) == 0) {
1260                         strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
1261                         goto done;
1262                 }
1263                 switch (match_parm(&s[3], hd_words, vals, 3)) {
1264                         case -1: /* "none" */
1265                         case -2: /* "noprobe" */
1266                                 drive->noprobe = 1;
1267                                 goto done;
1268                         case -3: /* "nowerr" */
1269                                 drive->bad_wstat = BAD_R_STAT;
1270                                 hwif->noprobe = 0;
1271                                 goto done;
1272                         case -4: /* "cdrom" */
1273                                 drive->present = 1;
1274                                 drive->media = ide_cdrom;
1275                                 /* an ATAPI device ignores DRDY */
1276                                 drive->ready_stat = 0;
1277                                 hwif->noprobe = 0;
1278                                 goto done;
1279                         case -5: /* nodma */
1280                                 drive->nodma = 1;
1281                                 goto done;
1282                         case -6: /* "autotune" */
1283                                 drive->autotune = IDE_TUNE_AUTO;
1284                                 goto obsolete_option;
1285                         case -7: /* "noautotune" */
1286                                 drive->autotune = IDE_TUNE_NOAUTO;
1287                                 goto obsolete_option;
1288                         case -11: /* noflush */
1289                                 drive->noflush = 1;
1290                                 goto done;
1291                         case -12: /* "remap" */
1292                                 drive->remap_0_to_1 = 1;
1293                                 goto done;
1294                         case -13: /* "remap63" */
1295                                 drive->sect0 = 63;
1296                                 goto done;
1297                         case -14: /* "scsi" */
1298                                 drive->scsi = 1;
1299                                 goto done;
1300                         case 3: /* cyl,head,sect */
1301                                 drive->media    = ide_disk;
1302                                 drive->ready_stat = READY_STAT;
1303                                 drive->cyl      = drive->bios_cyl  = vals[0];
1304                                 drive->head     = drive->bios_head = vals[1];
1305                                 drive->sect     = drive->bios_sect = vals[2];
1306                                 drive->present  = 1;
1307                                 drive->forced_geom = 1;
1308                                 hwif->noprobe = 0;
1309                                 goto done;
1310                         default:
1311                                 goto bad_option;
1312                 }
1313         }
1314
1315         if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
1316                 goto bad_option;
1317         /*
1318          * Look for bus speed option:  "idebus="
1319          */
1320         if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
1321                 if (match_parm(&s[6], NULL, vals, 1) != 1)
1322                         goto bad_option;
1323                 if (vals[0] >= 20 && vals[0] <= 66) {
1324                         idebus_parameter = vals[0];
1325                 } else
1326                         printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
1327                 goto done;
1328         }
1329         /*
1330          * Look for interface options:  "idex="
1331          */
1332         if (s[3] >= '0' && s[3] <= max_hwif) {
1333                 /*
1334                  * Be VERY CAREFUL changing this: note hardcoded indexes below
1335                  * (-8, -9, -10) are reserved to ease the hardcoding.
1336                  */
1337                 static const char *ide_words[] = {
1338                         "noprobe", "serialize", "minus3", "minus4",
1339                         "reset", "minus6", "ata66", "minus8", "minus9",
1340                         "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
1341                         "dtc2278", "umc8672", "ali14xx", NULL };
1342
1343                 hw_regs_t hwregs;
1344
1345                 hw = s[3] - '0';
1346                 hwif = &ide_hwifs[hw];
1347                 i = match_parm(&s[4], ide_words, vals, 3);
1348
1349                 /*
1350                  * Cryptic check to ensure chipset not already set for hwif.
1351                  * Note: we can't depend on hwif->chipset here.
1352                  */
1353                 if ((i >= -18 && i <= -11) || (i > 0 && i <= 3)) {
1354                         /* chipset already specified */
1355                         if (is_chipset_set[hw])
1356                                 goto bad_option;
1357                         if (i > -18 && i <= -11) {
1358                                 /* these drivers are for "ide0=" only */
1359                                 if (hw != 0)
1360                                         goto bad_hwif;
1361                                 /* chipset already specified for 2nd port */
1362                                 if (is_chipset_set[hw+1])
1363                                         goto bad_option;
1364                         }
1365                         is_chipset_set[hw] = 1;
1366                         printk("\n");
1367                 }
1368
1369                 switch (i) {
1370 #ifdef CONFIG_BLK_DEV_ALI14XX
1371                         case -17: /* "ali14xx" */
1372                                 probe_ali14xx = 1;
1373                                 goto done;
1374 #endif
1375 #ifdef CONFIG_BLK_DEV_UMC8672
1376                         case -16: /* "umc8672" */
1377                                 probe_umc8672 = 1;
1378                                 goto done;
1379 #endif
1380 #ifdef CONFIG_BLK_DEV_DTC2278
1381                         case -15: /* "dtc2278" */
1382                                 probe_dtc2278 = 1;
1383                                 goto done;
1384 #endif
1385 #ifdef CONFIG_BLK_DEV_CMD640
1386                         case -14: /* "cmd640_vlb" */
1387                                 cmd640_vlb = 1;
1388                                 goto done;
1389 #endif
1390 #ifdef CONFIG_BLK_DEV_HT6560B
1391                         case -13: /* "ht6560b" */
1392                                 probe_ht6560b = 1;
1393                                 goto done;
1394 #endif
1395 #ifdef CONFIG_BLK_DEV_QD65XX
1396                         case -12: /* "qd65xx" */
1397                                 probe_qd65xx = 1;
1398                                 goto done;
1399 #endif
1400 #ifdef CONFIG_BLK_DEV_4DRIVES
1401                         case -11: /* "four" drives on one set of ports */
1402                         {
1403                                 ide_hwif_t *mate = &ide_hwifs[hw^1];
1404                                 mate->drives[0].select.all ^= 0x20;
1405                                 mate->drives[1].select.all ^= 0x20;
1406                                 hwif->chipset = mate->chipset = ide_4drives;
1407                                 mate->irq = hwif->irq;
1408                                 memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
1409                                 hwif->mate = mate;
1410                                 mate->mate = hwif;
1411                                 hwif->serialized = mate->serialized = 1;
1412                                 goto obsolete_option;
1413                         }
1414 #endif /* CONFIG_BLK_DEV_4DRIVES */
1415                         case -10: /* minus10 */
1416                         case -9: /* minus9 */
1417                         case -8: /* minus8 */
1418                         case -6:
1419                         case -4:
1420                         case -3:
1421                                 goto bad_option;
1422                         case -7: /* ata66 */
1423 #ifdef CONFIG_BLK_DEV_IDEPCI
1424                                 /*
1425                                  * Use ATA_CBL_PATA40_SHORT so drive side
1426                                  * cable detection is also overriden.
1427                                  */
1428                                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1429                                 goto obsolete_option;
1430 #else
1431                                 goto bad_hwif;
1432 #endif
1433                         case -5: /* "reset" */
1434                                 hwif->reset = 1;
1435                                 goto obsolete_option;
1436                         case -2: /* "serialize" */
1437                                 hwif->mate = &ide_hwifs[hw^1];
1438                                 hwif->mate->mate = hwif;
1439                                 hwif->serialized = hwif->mate->serialized = 1;
1440                                 goto obsolete_option;
1441
1442                         case -1: /* "noprobe" */
1443                                 hwif->noprobe = 1;
1444                                 goto obsolete_option;
1445
1446                         case 1: /* base */
1447                                 vals[1] = vals[0] + 0x206; /* default ctl */
1448                         case 2: /* base,ctl */
1449                                 vals[2] = 0;    /* default irq = probe for it */
1450                         case 3: /* base,ctl,irq */
1451                                 memset(&hwregs, 0, sizeof(hwregs));
1452                                 ide_init_hwif_ports(&hwregs, vals[0], vals[1], &hwif->irq);
1453                                 memcpy(hwif->io_ports, hwregs.io_ports, sizeof(hwif->io_ports));
1454                                 hwif->irq      = vals[2];
1455                                 hwif->noprobe  = 0;
1456                                 hwif->chipset  = ide_forced;
1457                                 goto obsolete_option;
1458
1459                         case 0: goto bad_option;
1460                         default:
1461                                 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
1462                                 return 1;
1463                 }
1464         }
1465 bad_option:
1466         printk(" -- BAD OPTION\n");
1467         return 1;
1468 obsolete_option:
1469         printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
1470         return 1;
1471 bad_hwif:
1472         printk("-- NOT SUPPORTED ON ide%d", hw);
1473 done:
1474         printk("\n");
1475         return 1;
1476 }
1477
1478 EXPORT_SYMBOL(ide_lock);
1479
1480 static int ide_bus_match(struct device *dev, struct device_driver *drv)
1481 {
1482         return 1;
1483 }
1484
1485 static char *media_string(ide_drive_t *drive)
1486 {
1487         switch (drive->media) {
1488         case ide_disk:
1489                 return "disk";
1490         case ide_cdrom:
1491                 return "cdrom";
1492         case ide_tape:
1493                 return "tape";
1494         case ide_floppy:
1495                 return "floppy";
1496         case ide_optical:
1497                 return "optical";
1498         default:
1499                 return "UNKNOWN";
1500         }
1501 }
1502
1503 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
1504 {
1505         ide_drive_t *drive = to_ide_device(dev);
1506         return sprintf(buf, "%s\n", media_string(drive));
1507 }
1508
1509 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
1510 {
1511         ide_drive_t *drive = to_ide_device(dev);
1512         return sprintf(buf, "%s\n", drive->name);
1513 }
1514
1515 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1516 {
1517         ide_drive_t *drive = to_ide_device(dev);
1518         return sprintf(buf, "ide:m-%s\n", media_string(drive));
1519 }
1520
1521 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
1522                           char *buf)
1523 {
1524         ide_drive_t *drive = to_ide_device(dev);
1525         return sprintf(buf, "%s\n", drive->id->model);
1526 }
1527
1528 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
1529                              char *buf)
1530 {
1531         ide_drive_t *drive = to_ide_device(dev);
1532         return sprintf(buf, "%s\n", drive->id->fw_rev);
1533 }
1534
1535 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
1536                            char *buf)
1537 {
1538         ide_drive_t *drive = to_ide_device(dev);
1539         return sprintf(buf, "%s\n", drive->id->serial_no);
1540 }
1541
1542 static struct device_attribute ide_dev_attrs[] = {
1543         __ATTR_RO(media),
1544         __ATTR_RO(drivename),
1545         __ATTR_RO(modalias),
1546         __ATTR_RO(model),
1547         __ATTR_RO(firmware),
1548         __ATTR(serial, 0400, serial_show, NULL),
1549         __ATTR_NULL
1550 };
1551
1552 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
1553 {
1554         ide_drive_t *drive = to_ide_device(dev);
1555
1556         add_uevent_var(env, "MEDIA=%s", media_string(drive));
1557         add_uevent_var(env, "DRIVENAME=%s", drive->name);
1558         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
1559         return 0;
1560 }
1561
1562 static int generic_ide_probe(struct device *dev)
1563 {
1564         ide_drive_t *drive = to_ide_device(dev);
1565         ide_driver_t *drv = to_ide_driver(dev->driver);
1566
1567         return drv->probe ? drv->probe(drive) : -ENODEV;
1568 }
1569
1570 static int generic_ide_remove(struct device *dev)
1571 {
1572         ide_drive_t *drive = to_ide_device(dev);
1573         ide_driver_t *drv = to_ide_driver(dev->driver);
1574
1575         if (drv->remove)
1576                 drv->remove(drive);
1577
1578         return 0;
1579 }
1580
1581 static void generic_ide_shutdown(struct device *dev)
1582 {
1583         ide_drive_t *drive = to_ide_device(dev);
1584         ide_driver_t *drv = to_ide_driver(dev->driver);
1585
1586         if (dev->driver && drv->shutdown)
1587                 drv->shutdown(drive);
1588 }
1589
1590 struct bus_type ide_bus_type = {
1591         .name           = "ide",
1592         .match          = ide_bus_match,
1593         .uevent         = ide_uevent,
1594         .probe          = generic_ide_probe,
1595         .remove         = generic_ide_remove,
1596         .shutdown       = generic_ide_shutdown,
1597         .dev_attrs      = ide_dev_attrs,
1598         .suspend        = generic_ide_suspend,
1599         .resume         = generic_ide_resume,
1600 };
1601
1602 EXPORT_SYMBOL_GPL(ide_bus_type);
1603
1604 /*
1605  * This is gets invoked once during initialization, to set *everything* up
1606  */
1607 static int __init ide_init(void)
1608 {
1609         int ret;
1610
1611         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
1612         system_bus_speed = ide_system_bus_speed();
1613
1614         printk(KERN_INFO "ide: Assuming %dMHz system bus speed "
1615                          "for PIO modes%s\n", system_bus_speed,
1616                         idebus_parameter ? "" : "; override with idebus=xx");
1617
1618         ret = bus_register(&ide_bus_type);
1619         if (ret < 0) {
1620                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1621                 return ret;
1622         }
1623
1624         init_ide_data();
1625
1626         proc_ide_create();
1627
1628         return 0;
1629 }
1630
1631 #ifdef MODULE
1632 static char *options = NULL;
1633 module_param(options, charp, 0);
1634 MODULE_LICENSE("GPL");
1635
1636 static void __init parse_options (char *line)
1637 {
1638         char *next = line;
1639
1640         if (line == NULL || !*line)
1641                 return;
1642         while ((line = next) != NULL) {
1643                 if ((next = strchr(line,' ')) != NULL)
1644                         *next++ = 0;
1645                 if (!ide_setup(line))
1646                         printk (KERN_INFO "Unknown option '%s'\n", line);
1647         }
1648 }
1649
1650 int __init init_module (void)
1651 {
1652         parse_options(options);
1653         return ide_init();
1654 }
1655
1656 void __exit cleanup_module (void)
1657 {
1658         int index;
1659
1660         for (index = 0; index < MAX_HWIFS; ++index)
1661                 ide_unregister(index, 0, 0);
1662
1663         proc_ide_destroy();
1664
1665         bus_unregister(&ide_bus_type);
1666 }
1667
1668 #else /* !MODULE */
1669
1670 __setup("", ide_setup);
1671
1672 module_init(ide_init);
1673
1674 #endif /* MODULE */