drivers/ide/ide.c

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