drivers/ide/ide.c

   1 /*
   2  *  linux/drivers/ide/ide.c             Version 7.00beta2       Mar 05 2003
   3  *
   4  *  Copyright (C) 1994-1998  Linus Torvalds & authors (see below)
   5  */
   6
   7 /*
   8  *  Mostly written by Mark Lord  <mlord@pobox.com>
   9  *                and Gadi Oxman <gadio@netvision.net.il>
  10  *                and Andre Hedrick <andre@linux-ide.org>
  11  *
  12  *  See linux/MAINTAINERS for address of current maintainer.
  13  *
  14  * This is the multiple IDE interface driver, as evolved from hd.c.
  15  * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
  16  *   (usually 14 & 15).
  17  * There can be up to two drives per interface, as per the ATA-2 spec.
  18  *
  19  * ...
  20  *
  21  *  From hd.c:
  22  *  |
  23  *  | It traverses the request-list, using interrupts to jump between functions.
  24  *  | As nearly all functions can be called within interrupts, we may not sleep.
  25  *  | Special care is recommended.  Have Fun!
  26  *  |
  27  *  | modified by Drew Eckhardt to check nr of hd's from the CMOS.
  28  *  |
  29  *  | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
  30  *  | in the early extended-partition checks and added DM partitions.
  31  *  |
  32  *  | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
  33  *  |
  34  *  | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
  35  *  | and general streamlining by Mark Lord (mlord@pobox.com).
  36  *
  37  *  October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
  38  *
  39  *      Mark Lord       (mlord@pobox.com)               (IDE Perf.Pkg)
  40  *      Delman Lee      (delman@ieee.org)               ("Mr. atdisk2")
  41  *      Scott Snyder    (snyder@fnald0.fnal.gov)        (ATAPI IDE cd-rom)
  42  *
  43  *  This was a rewrite of just about everything from hd.c, though some original
  44  *  code is still sprinkled about.  Think of it as a major evolution, with
  45  *  inspiration from lots of linux users, esp.  hamish@zot.apana.org.au
  46  */
  47
  48 #define REVISION        "Revision: 7.00alpha2"
  49 #define VERSION         "Id: ide.c 7.00a2 20020906"
  50
  51 #define _IDE_C                  /* Tell ide.h it's really us */
  52
  53 #include <linux/module.h>
  54 #include <linux/types.h>
  55 #include <linux/string.h>
  56 #include <linux/kernel.h>
  57 #include <linux/timer.h>
  58 #include <linux/mm.h>
  59 #include <linux/interrupt.h>
  60 #include <linux/major.h>
  61 #include <linux/errno.h>
  62 #include <linux/genhd.h>
  63 #include <linux/blkpg.h>
  64 #include <linux/slab.h>
  65 #include <linux/init.h>
  66 #include <linux/pci.h>
  67 #include <linux/delay.h>
  68 #include <linux/ide.h>
  69 #include <linux/completion.h>
  70 #include <linux/reboot.h>
  71 #include <linux/cdrom.h>
  72 #include <linux/seq_file.h>
  73 #include <linux/device.h>
  74 #include <linux/bitops.h>
  75
  76 #include <asm/byteorder.h>
  77 #include <asm/irq.h>
  78 #include <asm/uaccess.h>
  79 #include <asm/io.h>
  80
  81
  82 /* default maximum number of failures */
  83 #define IDE_DEFAULT_MAX_FAILURES        1
  84
  85 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
  86                                         IDE2_MAJOR, IDE3_MAJOR,
  87                                         IDE4_MAJOR, IDE5_MAJOR,
  88                                         IDE6_MAJOR, IDE7_MAJOR,
  89                                         IDE8_MAJOR, IDE9_MAJOR };
  90
  91 static int idebus_parameter;    /* holds the "idebus=" parameter */
  92 static int system_bus_speed;    /* holds what we think is VESA/PCI bus speed */
  93
  94 DEFINE_MUTEX(ide_cfg_mtx);
  95  __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
  96
  97 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
  98 static int ide_scan_direction; /* THIS was formerly 2.2.x pci=reverse */
  99 #endif
 100
 101 int noautodma = 0;
 102
 103 EXPORT_SYMBOL(noautodma);
 104
 105 #ifdef CONFIG_BLK_DEV_IDEACPI
 106 int ide_noacpi = 0;
 107 int ide_noacpitfs = 1;
 108 int ide_noacpionboot = 1;
 109 #endif
 110
 111 /*
 112  * This is declared extern in ide.h, for access by other IDE modules:
 113  */
 114 ide_hwif_t ide_hwifs[MAX_HWIFS];        /* master data repository */
 115
 116 EXPORT_SYMBOL(ide_hwifs);
 117
 118 /*
 119  * Do not even *think* about calling this!
 120  */
 121 static void init_hwif_data(ide_hwif_t *hwif, unsigned int index)
 122 {
 123         unsigned int unit;
 124
 125         /* bulk initialize hwif & drive info with zeros */
 126         memset(hwif, 0, sizeof(ide_hwif_t));
 127
 128         /* fill in any non-zero initial values */
 129         hwif->index     = index;
 130         hwif->major     = ide_hwif_to_major[index];
 131
 132         hwif->name[0]   = 'i';
 133         hwif->name[1]   = 'd';
 134         hwif->name[2]   = 'e';
 135         hwif->name[3]   = '0' + index;
 136
 137         hwif->bus_state = BUSSTATE_ON;
 138
 139         hwif->atapi_dma = 0;            /* disable all atapi dma */
 140
 141         init_completion(&hwif->gendev_rel_comp);
 142
 143         default_hwif_iops(hwif);
 144         default_hwif_transport(hwif);
 145         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 146                 ide_drive_t *drive = &hwif->drives[unit];
 147
 148                 drive->media                    = ide_disk;
 149                 drive->select.all               = (unit<<4)|0xa0;
 150                 drive->hwif                     = hwif;
 151                 drive->ctl                      = 0x08;
 152                 drive->ready_stat               = READY_STAT;
 153                 drive->bad_wstat                = BAD_W_STAT;
 154                 drive->special.b.recalibrate    = 1;
 155                 drive->special.b.set_geometry   = 1;
 156                 drive->name[0]                  = 'h';
 157                 drive->name[1]                  = 'd';
 158                 drive->name[2]                  = 'a' + (index * MAX_DRIVES) + unit;
 159                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
 160                 drive->using_dma                = 0;
 161                 drive->vdma                     = 0;
 162                 INIT_LIST_HEAD(&drive->list);
 163                 init_completion(&drive->gendev_rel_comp);
 164         }
 165 }
 166
 167 static void init_hwif_default(ide_hwif_t *hwif, unsigned int index)
 168 {
 169         hw_regs_t hw;
 170
 171         memset(&hw, 0, sizeof(hw_regs_t));
 172
 173         ide_init_hwif_ports(&hw, ide_default_io_base(index), 0, &hwif->irq);
 174
 175         memcpy(&hwif->hw, &hw, sizeof(hw));
 176         memcpy(hwif->io_ports, hw.io_ports, sizeof(hw.io_ports));
 177
 178         hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
 179 #ifdef CONFIG_BLK_DEV_HD
 180         if (hwif->io_ports[IDE_DATA_OFFSET] == HD_DATA)
 181                 hwif->noprobe = 1;      /* may be overridden by ide_setup() */
 182 #endif
 183 }
 184
 185 extern void ide_arm_init(void);
 186
 187 /*
 188  * init_ide_data() sets reasonable default values into all fields
 189  * of all instances of the hwifs and drives, but only on the first call.
 190  * Subsequent calls have no effect (they don't wipe out anything).
 191  *
 192  * This routine is normally called at driver initialization time,
 193  * but may also be called MUCH earlier during kernel "command-line"
 194  * parameter processing.  As such, we cannot depend on any other parts
 195  * of the kernel (such as memory allocation) to be functioning yet.
 196  *
 197  * This is too bad, as otherwise we could dynamically allocate the
 198  * ide_drive_t structs as needed, rather than always consuming memory
 199  * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
 200  *
 201  * FIXME: We should stuff the setup data into __init and copy the
 202  * relevant hwifs/allocate them properly during boot.
 203  */
 204 #define MAGIC_COOKIE 0x12345678
 205 static void __init init_ide_data (void)
 206 {
 207         ide_hwif_t *hwif;
 208         unsigned int index;
 209         static unsigned long magic_cookie = MAGIC_COOKIE;
 210
 211         if (magic_cookie != MAGIC_COOKIE)
 212                 return;         /* already initialized */
 213         magic_cookie = 0;
 214
 215         /* Initialise all interface structures */
 216         for (index = 0; index < MAX_HWIFS; ++index) {
 217                 hwif = &ide_hwifs[index];
 218                 init_hwif_data(hwif, index);
 219                 init_hwif_default(hwif, index);
 220 #if !defined(CONFIG_PPC32) || !defined(CONFIG_PCI)
 221                 hwif->irq = hwif->hw.irq =
 222                         ide_init_default_irq(hwif->io_ports[IDE_DATA_OFFSET]);
 223 #endif
 224         }
 225 #ifdef CONFIG_IDE_ARM
 226         ide_arm_init();
 227 #endif
 228 }
 229
 230 /**
 231  *      ide_system_bus_speed    -       guess bus speed
 232  *
 233  *      ide_system_bus_speed() returns what we think is the system VESA/PCI
 234  *      bus speed (in MHz). This is used for calculating interface PIO timings.
 235  *      The default is 40 for known PCI systems, 50 otherwise.
 236  *      The "idebus=xx" parameter can be used to override this value.
 237  *      The actual value to be used is computed/displayed the first time
 238  *      through. Drivers should only use this as a last resort.
 239  *
 240  *      Returns a guessed speed in MHz.
 241  */
 242
 243 static int ide_system_bus_speed(void)
 244 {
 245 #ifdef CONFIG_PCI
 246         static struct pci_device_id pci_default[] = {
 247                 { PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID) },
 248                 { }
 249         };
 250 #else
 251 #define pci_default 0
 252 #endif /* CONFIG_PCI */
 253
 254         if (!system_bus_speed) {
 255                 if (idebus_parameter) {
 256                         /* user supplied value */
 257                         system_bus_speed = idebus_parameter;
 258                 } else if (pci_dev_present(pci_default)) {
 259                         /* safe default value for PCI */
 260                         system_bus_speed = 33;
 261                 } else {
 262                         /* safe default value for VESA and PCI */
 263                         system_bus_speed = 50;
 264                 }
 265                 printk(KERN_INFO "ide: Assuming %dMHz system bus speed "
 266                         "for PIO modes%s\n", system_bus_speed,
 267                         idebus_parameter ? "" : "; override with idebus=xx");
 268         }
 269         return system_bus_speed;
 270 }
 271
 272 static struct resource* hwif_request_region(ide_hwif_t *hwif,
 273                                             unsigned long addr, int num)
 274 {
 275         struct resource *res = request_region(addr, num, hwif->name);
 276
 277         if (!res)
 278                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
 279                                 hwif->name, addr, addr+num-1);
 280         return res;
 281 }
 282
 283 /**
 284  *      ide_hwif_request_regions - request resources for IDE
 285  *      @hwif: interface to use
 286  *
 287  *      Requests all the needed resources for an interface.
 288  *      Right now core IDE code does this work which is deeply wrong.
 289  *      MMIO leaves it to the controller driver,
 290  *      PIO will migrate this way over time.
 291  */
 292
 293 int ide_hwif_request_regions(ide_hwif_t *hwif)
 294 {
 295         unsigned long addr;
 296         unsigned int i;
 297
 298         if (hwif->mmio)
 299                 return 0;
 300         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 301         if (addr && !hwif_request_region(hwif, addr, 1))
 302                 goto control_region_busy;
 303         hwif->straight8 = 0;
 304         addr = hwif->io_ports[IDE_DATA_OFFSET];
 305         if ((addr | 7) == hwif->io_ports[IDE_STATUS_OFFSET]) {
 306                 if (!hwif_request_region(hwif, addr, 8))
 307                         goto data_region_busy;
 308                 hwif->straight8 = 1;
 309                 return 0;
 310         }
 311         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
 312                 addr = hwif->io_ports[i];
 313                 if (!hwif_request_region(hwif, addr, 1)) {
 314                         while (--i)
 315                                 release_region(addr, 1);
 316                         goto data_region_busy;
 317                 }
 318         }
 319         return 0;
 320
 321 data_region_busy:
 322         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 323         if (addr)
 324                 release_region(addr, 1);
 325 control_region_busy:
 326         /* If any errors are return, we drop the hwif interface. */
 327         return -EBUSY;
 328 }
 329
 330 /**
 331  *      ide_hwif_release_regions - free IDE resources
 332  *
 333  *      Note that we only release the standard ports,
 334  *      and do not even try to handle any extra ports
 335  *      allocated for weird IDE interface chipsets.
 336  *
 337  *      Note also that we don't yet handle mmio resources here. More
 338  *      importantly our caller should be doing this so we need to
 339  *      restructure this as a helper function for drivers.
 340  */
 341
 342 void ide_hwif_release_regions(ide_hwif_t *hwif)
 343 {
 344         u32 i = 0;
 345
 346         if (hwif->mmio)
 347                 return;
 348         if (hwif->io_ports[IDE_CONTROL_OFFSET])
 349                 release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
 350         if (hwif->straight8) {
 351                 release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
 352                 return;
 353         }
 354         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
 355                 if (hwif->io_ports[i])
 356                         release_region(hwif->io_ports[i], 1);
 357 }
 358
 359 /**
 360  *      ide_hwif_restore        -       restore hwif to template
 361  *      @hwif: hwif to update
 362  *      @tmp_hwif: template
 363  *
 364  *      Restore hwif to a previous state by copying most settings
 365  *      from the template.
 366  */
 367
 368 static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
 369 {
 370         hwif->hwgroup                   = tmp_hwif->hwgroup;
 371
 372         hwif->gendev.parent             = tmp_hwif->gendev.parent;
 373
 374         hwif->proc                      = tmp_hwif->proc;
 375
 376         hwif->major                     = tmp_hwif->major;
 377         hwif->straight8                 = tmp_hwif->straight8;
 378         hwif->bus_state                 = tmp_hwif->bus_state;
 379
 380         hwif->host_flags                = tmp_hwif->host_flags;
 381
 382         hwif->pio_mask                  = tmp_hwif->pio_mask;
 383
 384         hwif->atapi_dma                 = tmp_hwif->atapi_dma;
 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 #ifdef CONFIG_BLK_DEV_IDEPCI
 395         hwif->pci_dev                   = tmp_hwif->pci_dev;
 396         hwif->cds                       = tmp_hwif->cds;
 397 #endif
 398
 399         hwif->set_pio_mode              = tmp_hwif->set_pio_mode;
 400         hwif->speedproc                 = tmp_hwif->speedproc;
 401         hwif->mdma_filter               = tmp_hwif->mdma_filter;
 402         hwif->udma_filter               = tmp_hwif->udma_filter;
 403         hwif->selectproc                = tmp_hwif->selectproc;
 404         hwif->reset_poll                = tmp_hwif->reset_poll;
 405         hwif->pre_reset                 = tmp_hwif->pre_reset;
 406         hwif->resetproc                 = tmp_hwif->resetproc;
 407         hwif->intrproc                  = tmp_hwif->intrproc;
 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_setup                 = tmp_hwif->dma_setup;
 418         hwif->dma_exec_cmd              = tmp_hwif->dma_exec_cmd;
 419         hwif->dma_start                 = tmp_hwif->dma_start;
 420         hwif->ide_dma_end               = tmp_hwif->ide_dma_end;
 421         hwif->ide_dma_check             = tmp_hwif->ide_dma_check;
 422         hwif->ide_dma_on                = tmp_hwif->ide_dma_on;
 423         hwif->dma_off_quietly           = tmp_hwif->dma_off_quietly;
 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_host_on               = tmp_hwif->dma_host_on;
 427         hwif->dma_host_off              = tmp_hwif->dma_host_off;
 428         hwif->dma_lost_irq              = tmp_hwif->dma_lost_irq;
 429         hwif->dma_timeout               = tmp_hwif->dma_timeout;
 430
 431         hwif->OUTB                      = tmp_hwif->OUTB;
 432         hwif->OUTBSYNC                  = tmp_hwif->OUTBSYNC;
 433         hwif->OUTW                      = tmp_hwif->OUTW;
 434         hwif->OUTSW                     = tmp_hwif->OUTSW;
 435         hwif->OUTSL                     = tmp_hwif->OUTSL;
 436
 437         hwif->INB                       = tmp_hwif->INB;
 438         hwif->INW                       = tmp_hwif->INW;
 439         hwif->INSW                      = tmp_hwif->INSW;
 440         hwif->INSL                      = tmp_hwif->INSL;
 441
 442         hwif->sg_max_nents              = tmp_hwif->sg_max_nents;
 443
 444         hwif->mmio                      = tmp_hwif->mmio;
 445         hwif->rqsize                    = tmp_hwif->rqsize;
 446         hwif->no_lba48                  = tmp_hwif->no_lba48;
 447
 448 #ifndef CONFIG_BLK_DEV_IDECS
 449         hwif->irq                       = tmp_hwif->irq;
 450 #endif
 451
 452         hwif->dma_base                  = tmp_hwif->dma_base;
 453         hwif->dma_master                = tmp_hwif->dma_master;
 454         hwif->dma_command               = tmp_hwif->dma_command;
 455         hwif->dma_vendor1               = tmp_hwif->dma_vendor1;
 456         hwif->dma_status                = tmp_hwif->dma_status;
 457         hwif->dma_vendor3               = tmp_hwif->dma_vendor3;
 458         hwif->dma_prdtable              = tmp_hwif->dma_prdtable;
 459
 460         hwif->config_data               = tmp_hwif->config_data;
 461         hwif->select_data               = tmp_hwif->select_data;
 462         hwif->extra_base                = tmp_hwif->extra_base;
 463         hwif->extra_ports               = tmp_hwif->extra_ports;
 464         hwif->autodma                   = tmp_hwif->autodma;
 465
 466         hwif->hwif_data                 = tmp_hwif->hwif_data;
 467 }
 468
 469 /**
 470  *      ide_unregister          -       free an IDE interface
 471  *      @index: index of interface (will change soon to a pointer)
 472  *
 473  *      Perform the final unregister of an IDE interface. At the moment
 474  *      we don't refcount interfaces so this will also get split up.
 475  *
 476  *      Locking:
 477  *      The caller must not hold the IDE locks
 478  *      The drive present/vanishing is not yet properly locked
 479  *      Take care with the callbacks. These have been split to avoid
 480  *      deadlocking the IDE layer. The shutdown callback is called
 481  *      before we take the lock and free resources. It is up to the
 482  *      caller to be sure there is no pending I/O here, and that
 483  *      the interface will not be reopened (present/vanishing locking
 484  *      isn't yet done BTW). After we commit to the final kill we
 485  *      call the cleanup callback with the ide locks held.
 486  *
 487  *      Unregister restores the hwif structures to the default state.
 488  *      This is raving bonkers.
 489  */
 490
 491 void ide_unregister(unsigned int index)
 492 {
 493         ide_drive_t *drive;
 494         ide_hwif_t *hwif, *g;
 495         static ide_hwif_t tmp_hwif; /* protected by ide_cfg_mtx */
 496         ide_hwgroup_t *hwgroup;
 497         int irq_count = 0, unit;
 498
 499         BUG_ON(index >= MAX_HWIFS);
 500
 501         BUG_ON(in_interrupt());
 502         BUG_ON(irqs_disabled());
 503         mutex_lock(&ide_cfg_mtx);
 504         spin_lock_irq(&ide_lock);
 505         hwif = &ide_hwifs[index];
 506         if (!hwif->present)
 507                 goto abort;
 508         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 509                 drive = &hwif->drives[unit];
 510                 if (!drive->present)
 511                         continue;
 512                 spin_unlock_irq(&ide_lock);
 513                 device_unregister(&drive->gendev);
 514                 wait_for_completion(&drive->gendev_rel_comp);
 515                 spin_lock_irq(&ide_lock);
 516         }
 517         hwif->present = 0;
 518
 519         spin_unlock_irq(&ide_lock);
 520
 521         ide_proc_unregister_port(hwif);
 522
 523         hwgroup = hwif->hwgroup;
 524         /*
 525          * free the irq if we were the only hwif using it
 526          */
 527         g = hwgroup->hwif;
 528         do {
 529                 if (g->irq == hwif->irq)
 530                         ++irq_count;
 531                 g = g->next;
 532         } while (g != hwgroup->hwif);
 533         if (irq_count == 1)
 534                 free_irq(hwif->irq, hwgroup);
 535
 536         spin_lock_irq(&ide_lock);
 537         /*
 538          * Note that we only release the standard ports,
 539          * and do not even try to handle any extra ports
 540          * allocated for weird IDE interface chipsets.
 541          */
 542         ide_hwif_release_regions(hwif);
 543
 544         /*
 545          * Remove us from the hwgroup, and free
 546          * the hwgroup if we were the only member
 547          */
 548         if (hwif->next == hwif) {
 549                 BUG_ON(hwgroup->hwif != hwif);
 550                 kfree(hwgroup);
 551         } else {
 552                 /* There is another interface in hwgroup.
 553                  * Unlink us, and set hwgroup->drive and ->hwif to
 554                  * something sane.
 555                  */
 556                 g = hwgroup->hwif;
 557                 while (g->next != hwif)
 558                         g = g->next;
 559                 g->next = hwif->next;
 560                 if (hwgroup->hwif == hwif) {
 561                         /* Chose a random hwif for hwgroup->hwif.
 562                          * It's guaranteed that there are no drives
 563                          * left in the hwgroup.
 564                          */
 565                         BUG_ON(hwgroup->drive != NULL);
 566                         hwgroup->hwif = g;
 567                 }
 568                 BUG_ON(hwgroup->hwif == hwif);
 569         }
 570
 571         /* More messed up locking ... */
 572         spin_unlock_irq(&ide_lock);
 573         device_unregister(&hwif->gendev);
 574         wait_for_completion(&hwif->gendev_rel_comp);
 575
 576         /*
 577          * Remove us from the kernel's knowledge
 578          */
 579         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 580         kfree(hwif->sg_table);
 581         unregister_blkdev(hwif->major, hwif->name);
 582         spin_lock_irq(&ide_lock);
 583
 584         if (hwif->dma_base) {
 585                 (void) ide_release_dma(hwif);
 586
 587                 hwif->dma_base = 0;
 588                 hwif->dma_master = 0;
 589                 hwif->dma_command = 0;
 590                 hwif->dma_vendor1 = 0;
 591                 hwif->dma_status = 0;
 592                 hwif->dma_vendor3 = 0;
 593                 hwif->dma_prdtable = 0;
 594
 595                 hwif->extra_base  = 0;
 596                 hwif->extra_ports = 0;
 597         }
 598
 599         /* copy original settings */
 600         tmp_hwif = *hwif;
 601
 602         /* restore hwif data to pristine status */
 603         init_hwif_data(hwif, index);
 604         init_hwif_default(hwif, index);
 605
 606         ide_hwif_restore(hwif, &tmp_hwif);
 607
 608 abort:
 609         spin_unlock_irq(&ide_lock);
 610         mutex_unlock(&ide_cfg_mtx);
 611 }
 612
 613 EXPORT_SYMBOL(ide_unregister);
 614
 615
 616 /**
 617  *      ide_setup_ports         -       set up IDE interface ports
 618  *      @hw: register descriptions
 619  *      @base: base register
 620  *      @offsets: table of register offsets
 621  *      @ctrl: control register
 622  *      @ack_irq: IRQ ack
 623  *      @irq: interrupt lie
 624  *
 625  *      Setup hw_regs_t structure described by parameters.  You
 626  *      may set up the hw structure yourself OR use this routine to
 627  *      do it for you. This is basically a helper
 628  *
 629  */
 630
 631 void ide_setup_ports (  hw_regs_t *hw,
 632                         unsigned long base, int *offsets,
 633                         unsigned long ctrl, unsigned long intr,
 634                         ide_ack_intr_t *ack_intr,
 635 /*
 636  *                      ide_io_ops_t *iops,
 637  */
 638                         int irq)
 639 {
 640         int i;
 641
 642         memset(hw, 0, sizeof(hw_regs_t));
 643         for (i = 0; i < IDE_NR_PORTS; i++) {
 644                 if (offsets[i] == -1) {
 645                         switch(i) {
 646                                 case IDE_CONTROL_OFFSET:
 647                                         hw->io_ports[i] = ctrl;
 648                                         break;
 649 #if defined(CONFIG_AMIGA) || defined(CONFIG_MAC)
 650                                 case IDE_IRQ_OFFSET:
 651                                         hw->io_ports[i] = intr;
 652                                         break;
 653 #endif /* (CONFIG_AMIGA) || (CONFIG_MAC) */
 654                                 default:
 655                                         hw->io_ports[i] = 0;
 656                                         break;
 657                         }
 658                 } else {
 659                         hw->io_ports[i] = base + offsets[i];
 660                 }
 661         }
 662         hw->irq = irq;
 663         hw->dma = NO_DMA;
 664         hw->ack_intr = ack_intr;
 665 /*
 666  *      hw->iops = iops;
 667  */
 668 }
 669
 670 /**
 671  *      ide_register_hw_with_fixup      -       register IDE interface
 672  *      @hw: hardware registers
 673  *      @initializing: set while initializing built-in drivers
 674  *      @hwifp: pointer to returned hwif
 675  *      @fixup: fixup function
 676  *
 677  *      Register an IDE interface, specifying exactly the registers etc.
 678  *      Set init=1 iff calling before probes have taken place.
 679  *
 680  *      Returns -1 on error.
 681  */
 682
 683 int ide_register_hw_with_fixup(hw_regs_t *hw, int initializing,
 684                                ide_hwif_t **hwifp,
 685                                void(*fixup)(ide_hwif_t *hwif))
 686 {
 687         int index, retry = 1;
 688         ide_hwif_t *hwif;
 689
 690         do {
 691                 for (index = 0; index < MAX_HWIFS; ++index) {
 692                         hwif = &ide_hwifs[index];
 693                         if (hwif->hw.io_ports[IDE_DATA_OFFSET] == hw->io_ports[IDE_DATA_OFFSET])
 694                                 goto found;
 695                 }
 696                 for (index = 0; index < MAX_HWIFS; ++index) {
 697                         hwif = &ide_hwifs[index];
 698                         if (hwif->hold)
 699                                 continue;
 700                         if ((!hwif->present && !hwif->mate && !initializing) ||
 701                             (!hwif->hw.io_ports[IDE_DATA_OFFSET] && initializing))
 702                                 goto found;
 703                 }
 704                 for (index = 0; index < MAX_HWIFS; index++)
 705                         ide_unregister(index);
 706         } while (retry--);
 707         return -1;
 708 found:
 709         if (hwif->present)
 710                 ide_unregister(index);
 711         else if (!hwif->hold) {
 712                 init_hwif_data(hwif, index);
 713                 init_hwif_default(hwif, index);
 714         }
 715         if (hwif->present)
 716                 return -1;
 717         memcpy(&hwif->hw, hw, sizeof(*hw));
 718         memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->hw.io_ports));
 719         hwif->irq = hw->irq;
 720         hwif->noprobe = 0;
 721         hwif->chipset = hw->chipset;
 722         hwif->gendev.parent = hw->dev;
 723
 724         if (!initializing) {
 725                 probe_hwif_init_with_fixup(hwif, fixup);
 726                 ide_proc_register_port(hwif);
 727         }
 728
 729         if (hwifp)
 730                 *hwifp = hwif;
 731
 732         return (initializing || hwif->present) ? index : -1;
 733 }
 734
 735 EXPORT_SYMBOL(ide_register_hw_with_fixup);
 736
 737 int ide_register_hw(hw_regs_t *hw, int initializing, ide_hwif_t **hwifp)
 738 {
 739         return ide_register_hw_with_fixup(hw, initializing, hwifp, NULL);
 740 }
 741
 742 EXPORT_SYMBOL(ide_register_hw);
 743
 744 /*
 745  *      Locks for IDE setting functionality
 746  */
 747
 748 DEFINE_MUTEX(ide_setting_mtx);
 749
 750 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 751
 752 /**
 753  *      ide_spin_wait_hwgroup   -       wait for group
 754  *      @drive: drive in the group
 755  *
 756  *      Wait for an IDE device group to go non busy and then return
 757  *      holding the ide_lock which guards the hwgroup->busy status
 758  *      and right to use it.
 759  */
 760
 761 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 762 {
 763         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 764         unsigned long timeout = jiffies + (3 * HZ);
 765
 766         spin_lock_irq(&ide_lock);
 767
 768         while (hwgroup->busy) {
 769                 unsigned long lflags;
 770                 spin_unlock_irq(&ide_lock);
 771                 local_irq_set(lflags);
 772                 if (time_after(jiffies, timeout)) {
 773                         local_irq_restore(lflags);
 774                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 775                         return -EBUSY;
 776                 }
 777                 local_irq_restore(lflags);
 778                 spin_lock_irq(&ide_lock);
 779         }
 780         return 0;
 781 }
 782
 783 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 784
 785 int set_io_32bit(ide_drive_t *drive, int arg)
 786 {
 787         if (drive->no_io_32bit)
 788                 return -EPERM;
 789
 790         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 791                 return -EINVAL;
 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         return 0;
 799 }
 800
 801 static int set_ksettings(ide_drive_t *drive, int arg)
 802 {
 803         if (arg < 0 || arg > 1)
 804                 return -EINVAL;
 805
 806         if (ide_spin_wait_hwgroup(drive))
 807                 return -EBUSY;
 808         drive->keep_settings = arg;
 809         spin_unlock_irq(&ide_lock);
 810
 811         return 0;
 812 }
 813
 814 int set_using_dma(ide_drive_t *drive, int arg)
 815 {
 816 #ifdef CONFIG_BLK_DEV_IDEDMA
 817         ide_hwif_t *hwif = drive->hwif;
 818         int err = -EPERM;
 819
 820         if (arg < 0 || arg > 1)
 821                 return -EINVAL;
 822
 823         if (!drive->id || !(drive->id->capability & 1))
 824                 goto out;
 825
 826         if (hwif->ide_dma_check == NULL)
 827                 goto out;
 828
 829         err = -EBUSY;
 830         if (ide_spin_wait_hwgroup(drive))
 831                 goto out;
 832         /*
 833          * set ->busy flag, unlock and let it ride
 834          */
 835         hwif->hwgroup->busy = 1;
 836         spin_unlock_irq(&ide_lock);
 837
 838         err = 0;
 839
 840         if (arg) {
 841                 hwif->dma_off_quietly(drive);
 842                 if (ide_set_dma(drive) || hwif->ide_dma_on(drive))
 843                         err = -EIO;
 844         } else
 845                 ide_dma_off(drive);
 846
 847         /*
 848          * lock, clear ->busy flag and unlock before leaving
 849          */
 850         spin_lock_irq(&ide_lock);
 851         hwif->hwgroup->busy = 0;
 852         spin_unlock_irq(&ide_lock);
 853 out:
 854         return err;
 855 #else
 856         if (arg < 0 || arg > 1)
 857                 return -EINVAL;
 858
 859         return -EPERM;
 860 #endif
 861 }
 862
 863 int set_pio_mode(ide_drive_t *drive, int arg)
 864 {
 865         struct request rq;
 866
 867         if (arg < 0 || arg > 255)
 868                 return -EINVAL;
 869
 870         if (drive->hwif->set_pio_mode == NULL)
 871                 return -ENOSYS;
 872
 873         if (drive->special.b.set_tune)
 874                 return -EBUSY;
 875         ide_init_drive_cmd(&rq);
 876         drive->tune_req = (u8) arg;
 877         drive->special.b.set_tune = 1;
 878         (void) ide_do_drive_cmd(drive, &rq, ide_wait);
 879         return 0;
 880 }
 881
 882 static int set_unmaskirq(ide_drive_t *drive, int arg)
 883 {
 884         if (drive->no_unmask)
 885                 return -EPERM;
 886
 887         if (arg < 0 || arg > 1)
 888                 return -EINVAL;
 889
 890         if (ide_spin_wait_hwgroup(drive))
 891                 return -EBUSY;
 892         drive->unmask = arg;
 893         spin_unlock_irq(&ide_lock);
 894
 895         return 0;
 896 }
 897
 898 /**
 899  *      system_bus_clock        -       clock guess
 900  *
 901  *      External version of the bus clock guess used by very old IDE drivers
 902  *      for things like VLB timings. Should not be used.
 903  */
 904
 905 int system_bus_clock (void)
 906 {
 907         return((int) ((!system_bus_speed) ? ide_system_bus_speed() : system_bus_speed ));
 908 }
 909
 910 EXPORT_SYMBOL(system_bus_clock);
 911
 912 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 913 {
 914         ide_drive_t *drive = dev->driver_data;
 915         ide_hwif_t *hwif = HWIF(drive);
 916         struct request rq;
 917         struct request_pm_state rqpm;
 918         ide_task_t args;
 919         int ret;
 920
 921         /* Call ACPI _GTM only once */
 922         if (!(drive->dn % 2))
 923                 ide_acpi_get_timing(hwif);
 924
 925         memset(&rq, 0, sizeof(rq));
 926         memset(&rqpm, 0, sizeof(rqpm));
 927         memset(&args, 0, sizeof(args));
 928         rq.cmd_type = REQ_TYPE_PM_SUSPEND;
 929         rq.special = &args;
 930         rq.data = &rqpm;
 931         rqpm.pm_step = ide_pm_state_start_suspend;
 932         if (mesg.event == PM_EVENT_PRETHAW)
 933                 mesg.event = PM_EVENT_FREEZE;
 934         rqpm.pm_state = mesg.event;
 935
 936         ret = ide_do_drive_cmd(drive, &rq, ide_wait);
 937         /* only call ACPI _PS3 after both drivers are suspended */
 938         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 939                  && hwif->drives[1].present)
 940                  || !hwif->drives[0].present
 941                  || !hwif->drives[1].present))
 942                 ide_acpi_set_state(hwif, 0);
 943         return ret;
 944 }
 945
 946 static int generic_ide_resume(struct device *dev)
 947 {
 948         ide_drive_t *drive = dev->driver_data;
 949         ide_hwif_t *hwif = HWIF(drive);
 950         struct request rq;
 951         struct request_pm_state rqpm;
 952         ide_task_t args;
 953         int err;
 954
 955         /* Call ACPI _STM only once */
 956         if (!(drive->dn % 2)) {
 957                 ide_acpi_set_state(hwif, 1);
 958                 ide_acpi_push_timing(hwif);
 959         }
 960
 961         ide_acpi_exec_tfs(drive);
 962
 963         memset(&rq, 0, sizeof(rq));
 964         memset(&rqpm, 0, sizeof(rqpm));
 965         memset(&args, 0, sizeof(args));
 966         rq.cmd_type = REQ_TYPE_PM_RESUME;
 967         rq.special = &args;
 968         rq.data = &rqpm;
 969         rqpm.pm_step = ide_pm_state_start_resume;
 970         rqpm.pm_state = PM_EVENT_ON;
 971
 972         err = ide_do_drive_cmd(drive, &rq, ide_head_wait);
 973
 974         if (err == 0 && dev->driver) {
 975                 ide_driver_t *drv = to_ide_driver(dev->driver);
 976
 977                 if (drv->resume)
 978                         drv->resume(drive);
 979         }
 980
 981         return err;
 982 }
 983
 984 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 985                         unsigned int cmd, unsigned long arg)
 986 {
 987         unsigned long flags;
 988         ide_driver_t *drv;
 989         void __user *p = (void __user *)arg;
 990         int err = 0, (*setfunc)(ide_drive_t *, int);
 991         u8 *val;
 992
 993         switch (cmd) {
 994         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
 995         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
 996         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
 997         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
 998         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
 999         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
1000         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
1001         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
1002         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
1003         }
1004
1005         switch (cmd) {
1006                 case HDIO_OBSOLETE_IDENTITY:
1007                 case HDIO_GET_IDENTITY:
1008                         if (bdev != bdev->bd_contains)
1009                                 return -EINVAL;
1010                         if (drive->id_read == 0)
1011                                 return -ENOMSG;
1012                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
1013                                 return -EFAULT;
1014                         return 0;
1015
1016                 case HDIO_GET_NICE:
1017                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
1018                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
1019                                         drive->nice0            <<      IDE_NICE_0              |
1020                                         drive->nice1            <<      IDE_NICE_1              |
1021                                         drive->nice2            <<      IDE_NICE_2,
1022                                         (long __user *) arg);
1023
1024 #ifdef CONFIG_IDE_TASK_IOCTL
1025                 case HDIO_DRIVE_TASKFILE:
1026                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1027                                 return -EACCES;
1028                         switch(drive->media) {
1029                                 case ide_disk:
1030                                         return ide_taskfile_ioctl(drive, cmd, arg);
1031                                 default:
1032                                         return -ENOMSG;
1033                         }
1034 #endif /* CONFIG_IDE_TASK_IOCTL */
1035
1036                 case HDIO_DRIVE_CMD:
1037                         if (!capable(CAP_SYS_RAWIO))
1038                                 return -EACCES;
1039                         return ide_cmd_ioctl(drive, cmd, arg);
1040
1041                 case HDIO_DRIVE_TASK:
1042                         if (!capable(CAP_SYS_RAWIO))
1043                                 return -EACCES;
1044                         return ide_task_ioctl(drive, cmd, arg);
1045
1046                 case HDIO_SCAN_HWIF:
1047                 {
1048                         hw_regs_t hw;
1049                         int args[3];
1050                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1051                         if (copy_from_user(args, p, 3 * sizeof(int)))
1052                                 return -EFAULT;
1053                         memset(&hw, 0, sizeof(hw));
1054                         ide_init_hwif_ports(&hw, (unsigned long) args[0],
1055                                             (unsigned long) args[1], NULL);
1056                         hw.irq = args[2];
1057                         if (ide_register_hw(&hw, 0, NULL) == -1)
1058                                 return -EIO;
1059                         return 0;
1060                 }
1061                 case HDIO_UNREGISTER_HWIF:
1062                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1063                         /* (arg > MAX_HWIFS) checked in function */
1064                         ide_unregister(arg);
1065                         return 0;
1066                 case HDIO_SET_NICE:
1067                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1068                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
1069                                 return -EPERM;
1070                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
1071                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
1072                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
1073                                 drive->dsc_overlap = 0;
1074                                 return -EPERM;
1075                         }
1076                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
1077                         return 0;
1078                 case HDIO_DRIVE_RESET:
1079                 {
1080                         unsigned long flags;
1081                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1082
1083                         /*
1084                          *      Abort the current command on the
1085                          *      group if there is one, taking
1086                          *      care not to allow anything else
1087                          *      to be queued and to die on the
1088                          *      spot if we miss one somehow
1089                          */
1090
1091                         spin_lock_irqsave(&ide_lock, flags);
1092
1093                         if (HWGROUP(drive)->resetting) {
1094                                 spin_unlock_irqrestore(&ide_lock, flags);
1095                                 return -EBUSY;
1096                         }
1097
1098                         ide_abort(drive, "drive reset");
1099
1100                         BUG_ON(HWGROUP(drive)->handler);
1101
1102                         /* Ensure nothing gets queued after we
1103                            drop the lock. Reset will clear the busy */
1104
1105                         HWGROUP(drive)->busy = 1;
1106                         spin_unlock_irqrestore(&ide_lock, flags);
1107                         (void) ide_do_reset(drive);
1108
1109                         return 0;
1110                 }
1111
1112                 case HDIO_GET_BUSSTATE:
1113                         if (!capable(CAP_SYS_ADMIN))
1114                                 return -EACCES;
1115                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
1116                                 return -EFAULT;
1117                         return 0;
1118
1119                 case HDIO_SET_BUSSTATE:
1120                         if (!capable(CAP_SYS_ADMIN))
1121                                 return -EACCES;
1122                         if (HWIF(drive)->busproc)
1123                                 return HWIF(drive)->busproc(drive, (int)arg);
1124                         return -EOPNOTSUPP;
1125                 default:
1126                         return -EINVAL;
1127         }
1128
1129 read_val:
1130         mutex_lock(&ide_setting_mtx);
1131         spin_lock_irqsave(&ide_lock, flags);
1132         err = *val;
1133         spin_unlock_irqrestore(&ide_lock, flags);
1134         mutex_unlock(&ide_setting_mtx);
1135         return err >= 0 ? put_user(err, (long __user *)arg) : err;
1136
1137 set_val:
1138         if (bdev != bdev->bd_contains)
1139                 err = -EINVAL;
1140         else {
1141                 if (!capable(CAP_SYS_ADMIN))
1142                         err = -EACCES;
1143                 else {
1144                         mutex_lock(&ide_setting_mtx);
1145                         err = setfunc(drive, arg);
1146                         mutex_unlock(&ide_setting_mtx);
1147                 }
1148         }
1149         return err;
1150 }
1151
1152 EXPORT_SYMBOL(generic_ide_ioctl);
1153
1154 /*
1155  * stridx() returns the offset of c within s,
1156  * or -1 if c is '\0' or not found within s.
1157  */
1158 static int __init stridx (const char *s, char c)
1159 {
1160         char *i = strchr(s, c);
1161         return (i && c) ? i - s : -1;
1162 }
1163
1164 /*
1165  * match_parm() does parsing for ide_setup():
1166  *
1167  * 1. the first char of s must be '='.
1168  * 2. if the remainder matches one of the supplied keywords,
1169  *     the index (1 based) of the keyword is negated and returned.
1170  * 3. if the remainder is a series of no more than max_vals numbers
1171  *     separated by commas, the numbers are saved in vals[] and a
1172  *     count of how many were saved is returned.  Base10 is assumed,
1173  *     and base16 is allowed when prefixed with "0x".
1174  * 4. otherwise, zero is returned.
1175  */
1176 static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
1177 {
1178         static const char *decimal = "0123456789";
1179         static const char *hex = "0123456789abcdef";
1180         int i, n;
1181
1182         if (*s++ == '=') {
1183                 /*
1184                  * Try matching against the supplied keywords,
1185                  * and return -(index+1) if we match one
1186                  */
1187                 if (keywords != NULL) {
1188                         for (i = 0; *keywords != NULL; ++i) {
1189                                 if (!strcmp(s, *keywords++))
1190                                         return -(i+1);
1191                         }
1192                 }
1193                 /*
1194                  * Look for a series of no more than "max_vals"
1195                  * numeric values separated by commas, in base10,
1196                  * or base16 when prefixed with "0x".
1197                  * Return a count of how many were found.
1198                  */
1199                 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
1200                         vals[n] = i;
1201                         while ((i = stridx(decimal, *++s)) >= 0)
1202                                 vals[n] = (vals[n] * 10) + i;
1203                         if (*s == 'x' && !vals[n]) {
1204                                 while ((i = stridx(hex, *++s)) >= 0)
1205                                         vals[n] = (vals[n] * 0x10) + i;
1206                         }
1207                         if (++n == max_vals)
1208                                 break;
1209                         if (*s == ',' || *s == ';')
1210                                 ++s;
1211                 }
1212                 if (!*s)
1213                         return n;
1214         }
1215         return 0;       /* zero = nothing matched */
1216 }
1217
1218 #ifdef CONFIG_BLK_DEV_ALI14XX
1219 extern int probe_ali14xx;
1220 extern int ali14xx_init(void);
1221 #endif
1222 #ifdef CONFIG_BLK_DEV_UMC8672
1223 extern int probe_umc8672;
1224 extern int umc8672_init(void);
1225 #endif
1226 #ifdef CONFIG_BLK_DEV_DTC2278
1227 extern int probe_dtc2278;
1228 extern int dtc2278_init(void);
1229 #endif
1230 #ifdef CONFIG_BLK_DEV_HT6560B
1231 extern int probe_ht6560b;
1232 extern int ht6560b_init(void);
1233 #endif
1234 #ifdef CONFIG_BLK_DEV_QD65XX
1235 extern int probe_qd65xx;
1236 extern int qd65xx_init(void);
1237 #endif
1238
1239 static int __initdata is_chipset_set[MAX_HWIFS];
1240
1241 /*
1242  * ide_setup() gets called VERY EARLY during initialization,
1243  * to handle kernel "command line" strings beginning with "hdx=" or "ide".
1244  *
1245  * Remember to update Documentation/ide.txt if you change something here.
1246  */
1247 static int __init ide_setup(char *s)
1248 {
1249         int i, vals[3];
1250         ide_hwif_t *hwif;
1251         ide_drive_t *drive;
1252         unsigned int hw, unit;
1253         const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
1254         const char max_hwif  = '0' + (MAX_HWIFS - 1);
1255
1256
1257         if (strncmp(s,"hd",2) == 0 && s[2] == '=')      /* hd= is for hd.c   */
1258                 return 0;                               /* driver and not us */
1259
1260         if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
1261                 return 0;
1262
1263         printk(KERN_INFO "ide_setup: %s", s);
1264         init_ide_data ();
1265
1266 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
1267         if (!strcmp(s, "ide=doubler")) {
1268                 extern int ide_doubler;
1269
1270                 printk(" : Enabled support for IDE doublers\n");
1271                 ide_doubler = 1;
1272                 return 1;
1273         }
1274 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
1275
1276         if (!strcmp(s, "ide=nodma")) {
1277                 printk(" : Prevented DMA\n");
1278                 noautodma = 1;
1279                 return 1;
1280         }
1281
1282 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
1283         if (!strcmp(s, "ide=reverse")) {
1284                 ide_scan_direction = 1;
1285                 printk(" : Enabled support for IDE inverse scan order.\n");
1286                 return 1;
1287         }
1288 #endif
1289
1290 #ifdef CONFIG_BLK_DEV_IDEACPI
1291         if (!strcmp(s, "ide=noacpi")) {
1292                 //printk(" : Disable IDE ACPI support.\n");
1293                 ide_noacpi = 1;
1294                 return 1;
1295         }
1296         if (!strcmp(s, "ide=acpigtf")) {
1297                 //printk(" : Enable IDE ACPI _GTF support.\n");
1298                 ide_noacpitfs = 0;
1299                 return 1;
1300         }
1301         if (!strcmp(s, "ide=acpionboot")) {
1302                 //printk(" : Call IDE ACPI methods on boot.\n");
1303                 ide_noacpionboot = 0;
1304                 return 1;
1305         }
1306 #endif /* CONFIG_BLK_DEV_IDEACPI */
1307
1308         /*
1309          * Look for drive options:  "hdx="
1310          */
1311         if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
1312                 const char *hd_words[] = {
1313                         "none", "noprobe", "nowerr", "cdrom", "minus5",
1314                         "autotune", "noautotune", "minus8", "swapdata", "bswap",
1315                         "noflush", "remap", "remap63", "scsi", NULL };
1316                 unit = s[2] - 'a';
1317                 hw   = unit / MAX_DRIVES;
1318                 unit = unit % MAX_DRIVES;
1319                 hwif = &ide_hwifs[hw];
1320                 drive = &hwif->drives[unit];
1321                 if (strncmp(s + 4, "ide-", 4) == 0) {
1322                         strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
1323                         goto done;
1324                 }
1325                 switch (match_parm(&s[3], hd_words, vals, 3)) {
1326                         case -1: /* "none" */
1327                         case -2: /* "noprobe" */
1328                                 drive->noprobe = 1;
1329                                 goto done;
1330                         case -3: /* "nowerr" */
1331                                 drive->bad_wstat = BAD_R_STAT;
1332                                 hwif->noprobe = 0;
1333                                 goto done;
1334                         case -4: /* "cdrom" */
1335                                 drive->present = 1;
1336                                 drive->media = ide_cdrom;
1337                                 /* an ATAPI device ignores DRDY */
1338                                 drive->ready_stat = 0;
1339                                 hwif->noprobe = 0;
1340                                 goto done;
1341                         case -6: /* "autotune" */
1342                                 drive->autotune = IDE_TUNE_AUTO;
1343                                 goto obsolete_option;
1344                         case -7: /* "noautotune" */
1345                                 drive->autotune = IDE_TUNE_NOAUTO;
1346                                 goto obsolete_option;
1347                         case -9: /* "swapdata" */
1348                         case -10: /* "bswap" */
1349                                 drive->bswap = 1;
1350                                 goto done;
1351                         case -11: /* noflush */
1352                                 drive->noflush = 1;
1353                                 goto done;
1354                         case -12: /* "remap" */
1355                                 drive->remap_0_to_1 = 1;
1356                                 goto done;
1357                         case -13: /* "remap63" */
1358                                 drive->sect0 = 63;
1359                                 goto done;
1360                         case -14: /* "scsi" */
1361                                 drive->scsi = 1;
1362                                 goto done;
1363                         case 3: /* cyl,head,sect */
1364                                 drive->media    = ide_disk;
1365                                 drive->ready_stat = READY_STAT;
1366                                 drive->cyl      = drive->bios_cyl  = vals[0];
1367                                 drive->head     = drive->bios_head = vals[1];
1368                                 drive->sect     = drive->bios_sect = vals[2];
1369                                 drive->present  = 1;
1370                                 drive->forced_geom = 1;
1371                                 hwif->noprobe = 0;
1372                                 goto done;
1373                         default:
1374                                 goto bad_option;
1375                 }
1376         }
1377
1378         if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
1379                 goto bad_option;
1380         /*
1381          * Look for bus speed option:  "idebus="
1382          */
1383         if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
1384                 if (match_parm(&s[6], NULL, vals, 1) != 1)
1385                         goto bad_option;
1386                 if (vals[0] >= 20 && vals[0] <= 66) {
1387                         idebus_parameter = vals[0];
1388                 } else
1389                         printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
1390                 goto done;
1391         }
1392         /*
1393          * Look for interface options:  "idex="
1394          */
1395         if (s[3] >= '0' && s[3] <= max_hwif) {
1396                 /*
1397                  * Be VERY CAREFUL changing this: note hardcoded indexes below
1398                  * (-8, -9, -10) are reserved to ease the hardcoding.
1399                  */
1400                 static const char *ide_words[] = {
1401                         "noprobe", "serialize", "minus3", "minus4",
1402                         "reset", "dma", "ata66", "minus8", "minus9",
1403                         "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
1404                         "dtc2278", "umc8672", "ali14xx", NULL };
1405                 hw = s[3] - '0';
1406                 hwif = &ide_hwifs[hw];
1407                 i = match_parm(&s[4], ide_words, vals, 3);
1408
1409                 /*
1410                  * Cryptic check to ensure chipset not already set for hwif.
1411                  * Note: we can't depend on hwif->chipset here.
1412                  */
1413                 if ((i >= -18 && i <= -11) || (i > 0 && i <= 3)) {
1414                         /* chipset already specified */
1415                         if (is_chipset_set[hw])
1416                                 goto bad_option;
1417                         if (i > -18 && i <= -11) {
1418                                 /* these drivers are for "ide0=" only */
1419                                 if (hw != 0)
1420                                         goto bad_hwif;
1421                                 /* chipset already specified for 2nd port */
1422                                 if (is_chipset_set[hw+1])
1423                                         goto bad_option;
1424                         }
1425                         is_chipset_set[hw] = 1;
1426                         printk("\n");
1427                 }
1428
1429                 switch (i) {
1430 #ifdef CONFIG_BLK_DEV_ALI14XX
1431                         case -17: /* "ali14xx" */
1432                                 probe_ali14xx = 1;
1433                                 goto done;
1434 #endif
1435 #ifdef CONFIG_BLK_DEV_UMC8672
1436                         case -16: /* "umc8672" */
1437                                 probe_umc8672 = 1;
1438                                 goto done;
1439 #endif
1440 #ifdef CONFIG_BLK_DEV_DTC2278
1441                         case -15: /* "dtc2278" */
1442                                 probe_dtc2278 = 1;
1443                                 goto done;
1444 #endif
1445 #ifdef CONFIG_BLK_DEV_CMD640
1446                         case -14: /* "cmd640_vlb" */
1447                         {
1448                                 extern int cmd640_vlb; /* flag for cmd640.c */
1449                                 cmd640_vlb = 1;
1450                                 goto done;
1451                         }
1452 #endif
1453 #ifdef CONFIG_BLK_DEV_HT6560B
1454                         case -13: /* "ht6560b" */
1455                                 probe_ht6560b = 1;
1456                                 goto done;
1457 #endif
1458 #ifdef CONFIG_BLK_DEV_QD65XX
1459                         case -12: /* "qd65xx" */
1460                                 probe_qd65xx = 1;
1461                                 goto done;
1462 #endif
1463 #ifdef CONFIG_BLK_DEV_4DRIVES
1464                         case -11: /* "four" drives on one set of ports */
1465                         {
1466                                 ide_hwif_t *mate = &ide_hwifs[hw^1];
1467                                 mate->drives[0].select.all ^= 0x20;
1468                                 mate->drives[1].select.all ^= 0x20;
1469                                 hwif->chipset = mate->chipset = ide_4drives;
1470                                 mate->irq = hwif->irq;
1471                                 memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
1472                                 hwif->mate = mate;
1473                                 mate->mate = hwif;
1474                                 hwif->serialized = mate->serialized = 1;
1475                                 goto obsolete_option;
1476                         }
1477 #endif /* CONFIG_BLK_DEV_4DRIVES */
1478                         case -10: /* minus10 */
1479                         case -9: /* minus9 */
1480                         case -8: /* minus8 */
1481                         case -4:
1482                         case -3:
1483                                 goto bad_option;
1484                         case -7: /* ata66 */
1485 #ifdef CONFIG_BLK_DEV_IDEPCI
1486                                 /*
1487                                  * Use ATA_CBL_PATA40_SHORT so drive side
1488                                  * cable detection is also overriden.
1489                                  */
1490                                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1491                                 goto obsolete_option;
1492 #else
1493                                 goto bad_hwif;
1494 #endif
1495                         case -6: /* dma */
1496                                 hwif->autodma = 1;
1497                                 goto obsolete_option;
1498                         case -5: /* "reset" */
1499                                 hwif->reset = 1;
1500                                 goto obsolete_option;
1501                         case -2: /* "serialize" */
1502                                 hwif->mate = &ide_hwifs[hw^1];
1503                                 hwif->mate->mate = hwif;
1504                                 hwif->serialized = hwif->mate->serialized = 1;
1505                                 goto obsolete_option;
1506
1507                         case -1: /* "noprobe" */
1508                                 hwif->noprobe = 1;
1509                                 goto done;
1510
1511                         case 1: /* base */
1512                                 vals[1] = vals[0] + 0x206; /* default ctl */
1513                         case 2: /* base,ctl */
1514                                 vals[2] = 0;    /* default irq = probe for it */
1515                         case 3: /* base,ctl,irq */
1516                                 hwif->hw.irq = vals[2];
1517                                 ide_init_hwif_ports(&hwif->hw, (unsigned long) vals[0], (unsigned long) vals[1], &hwif->irq);
1518                                 memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->io_ports));
1519                                 hwif->irq      = vals[2];
1520                                 hwif->noprobe  = 0;
1521                                 hwif->chipset  = ide_forced;
1522                                 goto obsolete_option;
1523
1524                         case 0: goto bad_option;
1525                         default:
1526                                 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
1527                                 return 1;
1528                 }
1529         }
1530 bad_option:
1531         printk(" -- BAD OPTION\n");
1532         return 1;
1533 obsolete_option:
1534         printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
1535         return 1;
1536 bad_hwif:
1537         printk("-- NOT SUPPORTED ON ide%d", hw);
1538 done:
1539         printk("\n");
1540         return 1;
1541 }
1542
1543 extern void __init pnpide_init(void);
1544 extern void __exit pnpide_exit(void);
1545 extern void __init h8300_ide_init(void);
1546
1547 /*
1548  * probe_for_hwifs() finds/initializes "known" IDE interfaces
1549  */
1550 static void __init probe_for_hwifs (void)
1551 {
1552 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
1553         ide_scan_pcibus(ide_scan_direction);
1554 #endif
1555
1556 #ifdef CONFIG_ETRAX_IDE
1557         {
1558                 extern void init_e100_ide(void);
1559                 init_e100_ide();
1560         }
1561 #endif /* CONFIG_ETRAX_IDE */
1562 #ifdef CONFIG_BLK_DEV_CMD640
1563         {
1564                 extern void ide_probe_for_cmd640x(void);
1565                 ide_probe_for_cmd640x();
1566         }
1567 #endif /* CONFIG_BLK_DEV_CMD640 */
1568 #ifdef CONFIG_BLK_DEV_IDE_PMAC
1569         {
1570                 extern int pmac_ide_probe(void);
1571                 (void)pmac_ide_probe();
1572         }
1573 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
1574 #ifdef CONFIG_BLK_DEV_GAYLE
1575         {
1576                 extern void gayle_init(void);
1577                 gayle_init();
1578         }
1579 #endif /* CONFIG_BLK_DEV_GAYLE */
1580 #ifdef CONFIG_BLK_DEV_FALCON_IDE
1581         {
1582                 extern void falconide_init(void);
1583                 falconide_init();
1584         }
1585 #endif /* CONFIG_BLK_DEV_FALCON_IDE */
1586 #ifdef CONFIG_BLK_DEV_MAC_IDE
1587         {
1588                 extern void macide_init(void);
1589                 macide_init();
1590         }
1591 #endif /* CONFIG_BLK_DEV_MAC_IDE */
1592 #ifdef CONFIG_BLK_DEV_Q40IDE
1593         {
1594                 extern void q40ide_init(void);
1595                 q40ide_init();
1596         }
1597 #endif /* CONFIG_BLK_DEV_Q40IDE */
1598 #ifdef CONFIG_BLK_DEV_BUDDHA
1599         {
1600                 extern void buddha_init(void);
1601                 buddha_init();
1602         }
1603 #endif /* CONFIG_BLK_DEV_BUDDHA */
1604 #ifdef CONFIG_BLK_DEV_IDEPNP
1605         pnpide_init();
1606 #endif
1607 #ifdef CONFIG_H8300
1608         h8300_ide_init();
1609 #endif
1610 }
1611
1612 /*
1613  * Probe module
1614  */
1615
1616 EXPORT_SYMBOL(ide_lock);
1617
1618 static int ide_bus_match(struct device *dev, struct device_driver *drv)
1619 {
1620         return 1;
1621 }
1622
1623 static char *media_string(ide_drive_t *drive)
1624 {
1625         switch (drive->media) {
1626         case ide_disk:
1627                 return "disk";
1628         case ide_cdrom:
1629                 return "cdrom";
1630         case ide_tape:
1631                 return "tape";
1632         case ide_floppy:
1633                 return "floppy";
1634         case ide_optical:
1635                 return "optical";
1636         default:
1637                 return "UNKNOWN";
1638         }
1639 }
1640
1641 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
1642 {
1643         ide_drive_t *drive = to_ide_device(dev);
1644         return sprintf(buf, "%s\n", media_string(drive));
1645 }
1646
1647 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
1648 {
1649         ide_drive_t *drive = to_ide_device(dev);
1650         return sprintf(buf, "%s\n", drive->name);
1651 }
1652
1653 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1654 {
1655         ide_drive_t *drive = to_ide_device(dev);
1656         return sprintf(buf, "ide:m-%s\n", media_string(drive));
1657 }
1658
1659 static struct device_attribute ide_dev_attrs[] = {
1660         __ATTR_RO(media),
1661         __ATTR_RO(drivename),
1662         __ATTR_RO(modalias),
1663         __ATTR_NULL
1664 };
1665
1666 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
1667 {
1668         ide_drive_t *drive = to_ide_device(dev);
1669
1670         add_uevent_var(env, "MEDIA=%s", media_string(drive));
1671         add_uevent_var(env, "DRIVENAME=%s", drive->name);
1672         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
1673         return 0;
1674 }
1675
1676 static int generic_ide_probe(struct device *dev)
1677 {
1678         ide_drive_t *drive = to_ide_device(dev);
1679         ide_driver_t *drv = to_ide_driver(dev->driver);
1680
1681         return drv->probe ? drv->probe(drive) : -ENODEV;
1682 }
1683
1684 static int generic_ide_remove(struct device *dev)
1685 {
1686         ide_drive_t *drive = to_ide_device(dev);
1687         ide_driver_t *drv = to_ide_driver(dev->driver);
1688
1689         if (drv->remove)
1690                 drv->remove(drive);
1691
1692         return 0;
1693 }
1694
1695 static void generic_ide_shutdown(struct device *dev)
1696 {
1697         ide_drive_t *drive = to_ide_device(dev);
1698         ide_driver_t *drv = to_ide_driver(dev->driver);
1699
1700         if (dev->driver && drv->shutdown)
1701                 drv->shutdown(drive);
1702 }
1703
1704 struct bus_type ide_bus_type = {
1705         .name           = "ide",
1706         .match          = ide_bus_match,
1707         .uevent         = ide_uevent,
1708         .probe          = generic_ide_probe,
1709         .remove         = generic_ide_remove,
1710         .shutdown       = generic_ide_shutdown,
1711         .dev_attrs      = ide_dev_attrs,
1712         .suspend        = generic_ide_suspend,
1713         .resume         = generic_ide_resume,
1714 };
1715
1716 EXPORT_SYMBOL_GPL(ide_bus_type);
1717
1718 /*
1719  * This is gets invoked once during initialization, to set *everything* up
1720  */
1721 static int __init ide_init(void)
1722 {
1723         int ret;
1724
1725         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver " REVISION "\n");
1726         system_bus_speed = ide_system_bus_speed();
1727
1728         ret = bus_register(&ide_bus_type);
1729         if (ret < 0) {
1730                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1731                 return ret;
1732         }
1733
1734         init_ide_data();
1735
1736         proc_ide_create();
1737
1738 #ifdef CONFIG_BLK_DEV_ALI14XX
1739         if (probe_ali14xx)
1740                 (void)ali14xx_init();
1741 #endif
1742 #ifdef CONFIG_BLK_DEV_UMC8672
1743         if (probe_umc8672)
1744                 (void)umc8672_init();
1745 #endif
1746 #ifdef CONFIG_BLK_DEV_DTC2278
1747         if (probe_dtc2278)
1748                 (void)dtc2278_init();
1749 #endif
1750 #ifdef CONFIG_BLK_DEV_HT6560B
1751         if (probe_ht6560b)
1752                 (void)ht6560b_init();
1753 #endif
1754 #ifdef CONFIG_BLK_DEV_QD65XX
1755         if (probe_qd65xx)
1756                 (void)qd65xx_init();
1757 #endif
1758
1759         /* Probe for special PCI and other "known" interface chipsets. */
1760         probe_for_hwifs();
1761
1762         return 0;
1763 }
1764
1765 #ifdef MODULE
1766 static char *options = NULL;
1767 module_param(options, charp, 0);
1768 MODULE_LICENSE("GPL");
1769
1770 static void __init parse_options (char *line)
1771 {
1772         char *next = line;
1773
1774         if (line == NULL || !*line)
1775                 return;
1776         while ((line = next) != NULL) {
1777                 if ((next = strchr(line,' ')) != NULL)
1778                         *next++ = 0;
1779                 if (!ide_setup(line))
1780                         printk (KERN_INFO "Unknown option '%s'\n", line);
1781         }
1782 }
1783
1784 int __init init_module (void)
1785 {
1786         parse_options(options);
1787         return ide_init();
1788 }
1789
1790 void __exit cleanup_module (void)
1791 {
1792         int index;
1793
1794         for (index = 0; index < MAX_HWIFS; ++index)
1795                 ide_unregister(index);
1796
1797 #ifdef CONFIG_BLK_DEV_IDEPNP
1798         pnpide_exit();
1799 #endif
1800
1801         proc_ide_destroy();
1802
1803         bus_unregister(&ide_bus_type);
1804 }
1805
1806 #else /* !MODULE */
1807
1808 __setup("", ide_setup);
1809
1810 module_init(ide_init);
1811
1812 #endif /* MODULE */