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   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 #ifdef CONFIG_BLK_DEV_IDEACPI
 104 int ide_noacpi = 0;
 105 int ide_noacpitfs = 1;
 106 int ide_noacpionboot = 1;
 107 #endif
 108
 109 /*
 110  * This is declared extern in ide.h, for access by other IDE modules:
 111  */
 112 ide_hwif_t ide_hwifs[MAX_HWIFS];        /* master data repository */
 113
 114 EXPORT_SYMBOL(ide_hwifs);
 115
 116 /*
 117  * Do not even *think* about calling this!
 118  */
 119 void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
 120 {
 121         unsigned int unit;
 122
 123         /* bulk initialize hwif & drive info with zeros */
 124         memset(hwif, 0, sizeof(ide_hwif_t));
 125
 126         /* fill in any non-zero initial values */
 127         hwif->index     = index;
 128         hwif->major     = ide_hwif_to_major[index];
 129
 130         hwif->name[0]   = 'i';
 131         hwif->name[1]   = 'd';
 132         hwif->name[2]   = 'e';
 133         hwif->name[3]   = '0' + index;
 134
 135         hwif->bus_state = BUSSTATE_ON;
 136
 137         init_completion(&hwif->gendev_rel_comp);
 138
 139         default_hwif_iops(hwif);
 140         default_hwif_transport(hwif);
 141         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 142                 ide_drive_t *drive = &hwif->drives[unit];
 143
 144                 drive->media                    = ide_disk;
 145                 drive->select.all               = (unit<<4)|0xa0;
 146                 drive->hwif                     = hwif;
 147                 drive->ctl                      = 0x08;
 148                 drive->ready_stat               = READY_STAT;
 149                 drive->bad_wstat                = BAD_W_STAT;
 150                 drive->special.b.recalibrate    = 1;
 151                 drive->special.b.set_geometry   = 1;
 152                 drive->name[0]                  = 'h';
 153                 drive->name[1]                  = 'd';
 154                 drive->name[2]                  = 'a' + (index * MAX_DRIVES) + unit;
 155                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
 156                 drive->using_dma                = 0;
 157                 drive->vdma                     = 0;
 158                 INIT_LIST_HEAD(&drive->list);
 159                 init_completion(&drive->gendev_rel_comp);
 160         }
 161 }
 162 EXPORT_SYMBOL_GPL(ide_init_port_data);
 163
 164 static void init_hwif_default(ide_hwif_t *hwif, unsigned int index)
 165 {
 166         hw_regs_t hw;
 167
 168         memset(&hw, 0, sizeof(hw_regs_t));
 169
 170         ide_init_hwif_ports(&hw, ide_default_io_base(index), 0, &hwif->irq);
 171
 172         memcpy(hwif->io_ports, hw.io_ports, sizeof(hw.io_ports));
 173
 174         hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
 175 #ifdef CONFIG_BLK_DEV_HD
 176         if (hwif->io_ports[IDE_DATA_OFFSET] == HD_DATA)
 177                 hwif->noprobe = 1;      /* may be overridden by ide_setup() */
 178 #endif
 179 }
 180
 181 extern void ide_arm_init(void);
 182
 183 /*
 184  * init_ide_data() sets reasonable default values into all fields
 185  * of all instances of the hwifs and drives, but only on the first call.
 186  * Subsequent calls have no effect (they don't wipe out anything).
 187  *
 188  * This routine is normally called at driver initialization time,
 189  * but may also be called MUCH earlier during kernel "command-line"
 190  * parameter processing.  As such, we cannot depend on any other parts
 191  * of the kernel (such as memory allocation) to be functioning yet.
 192  *
 193  * This is too bad, as otherwise we could dynamically allocate the
 194  * ide_drive_t structs as needed, rather than always consuming memory
 195  * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
 196  *
 197  * FIXME: We should stuff the setup data into __init and copy the
 198  * relevant hwifs/allocate them properly during boot.
 199  */
 200 #define MAGIC_COOKIE 0x12345678
 201 static void __init init_ide_data (void)
 202 {
 203         ide_hwif_t *hwif;
 204         unsigned int index;
 205         static unsigned long magic_cookie = MAGIC_COOKIE;
 206
 207         if (magic_cookie != MAGIC_COOKIE)
 208                 return;         /* already initialized */
 209         magic_cookie = 0;
 210
 211         /* Initialise all interface structures */
 212         for (index = 0; index < MAX_HWIFS; ++index) {
 213                 hwif = &ide_hwifs[index];
 214                 ide_init_port_data(hwif, index);
 215                 init_hwif_default(hwif, index);
 216 #if !defined(CONFIG_PPC32) || !defined(CONFIG_PCI)
 217                 hwif->irq =
 218                         ide_init_default_irq(hwif->io_ports[IDE_DATA_OFFSET]);
 219 #endif
 220         }
 221 #ifdef CONFIG_IDE_ARM
 222         ide_arm_init();
 223 #endif
 224 }
 225
 226 /**
 227  *      ide_system_bus_speed    -       guess bus speed
 228  *
 229  *      ide_system_bus_speed() returns what we think is the system VESA/PCI
 230  *      bus speed (in MHz). This is used for calculating interface PIO timings.
 231  *      The default is 40 for known PCI systems, 50 otherwise.
 232  *      The "idebus=xx" parameter can be used to override this value.
 233  *      The actual value to be used is computed/displayed the first time
 234  *      through. Drivers should only use this as a last resort.
 235  *
 236  *      Returns a guessed speed in MHz.
 237  */
 238
 239 static int ide_system_bus_speed(void)
 240 {
 241 #ifdef CONFIG_PCI
 242         static struct pci_device_id pci_default[] = {
 243                 { PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID) },
 244                 { }
 245         };
 246 #else
 247 #define pci_default 0
 248 #endif /* CONFIG_PCI */
 249
 250         if (!system_bus_speed) {
 251                 if (idebus_parameter) {
 252                         /* user supplied value */
 253                         system_bus_speed = idebus_parameter;
 254                 } else if (pci_dev_present(pci_default)) {
 255                         /* safe default value for PCI */
 256                         system_bus_speed = 33;
 257                 } else {
 258                         /* safe default value for VESA and PCI */
 259                         system_bus_speed = 50;
 260                 }
 261                 printk(KERN_INFO "ide: Assuming %dMHz system bus speed "
 262                         "for PIO modes%s\n", system_bus_speed,
 263                         idebus_parameter ? "" : "; override with idebus=xx");
 264         }
 265         return system_bus_speed;
 266 }
 267
 268 ide_hwif_t * ide_find_port(unsigned long base)
 269 {
 270         ide_hwif_t *hwif;
 271         int i;
 272
 273         for (i = 0; i < MAX_HWIFS; i++) {
 274                 hwif = &ide_hwifs[i];
 275                 if (hwif->io_ports[IDE_DATA_OFFSET] == base)
 276                         goto found;
 277         }
 278
 279         for (i = 0; i < MAX_HWIFS; i++) {
 280                 hwif = &ide_hwifs[i];
 281                 if (hwif->io_ports[IDE_DATA_OFFSET] == 0)
 282                         goto found;
 283         }
 284
 285         hwif = NULL;
 286 found:
 287         return hwif;
 288 }
 289
 290 EXPORT_SYMBOL_GPL(ide_find_port);
 291
 292 static struct resource* hwif_request_region(ide_hwif_t *hwif,
 293                                             unsigned long addr, int num)
 294 {
 295         struct resource *res = request_region(addr, num, hwif->name);
 296
 297         if (!res)
 298                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
 299                                 hwif->name, addr, addr+num-1);
 300         return res;
 301 }
 302
 303 /**
 304  *      ide_hwif_request_regions - request resources for IDE
 305  *      @hwif: interface to use
 306  *
 307  *      Requests all the needed resources for an interface.
 308  *      Right now core IDE code does this work which is deeply wrong.
 309  *      MMIO leaves it to the controller driver,
 310  *      PIO will migrate this way over time.
 311  */
 312
 313 int ide_hwif_request_regions(ide_hwif_t *hwif)
 314 {
 315         unsigned long addr;
 316         unsigned int i;
 317
 318         if (hwif->mmio)
 319                 return 0;
 320         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 321         if (addr && !hwif_request_region(hwif, addr, 1))
 322                 goto control_region_busy;
 323         hwif->straight8 = 0;
 324         addr = hwif->io_ports[IDE_DATA_OFFSET];
 325         if ((addr | 7) == hwif->io_ports[IDE_STATUS_OFFSET]) {
 326                 if (!hwif_request_region(hwif, addr, 8))
 327                         goto data_region_busy;
 328                 hwif->straight8 = 1;
 329                 return 0;
 330         }
 331         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
 332                 addr = hwif->io_ports[i];
 333                 if (!hwif_request_region(hwif, addr, 1)) {
 334                         while (--i)
 335                                 release_region(addr, 1);
 336                         goto data_region_busy;
 337                 }
 338         }
 339         return 0;
 340
 341 data_region_busy:
 342         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 343         if (addr)
 344                 release_region(addr, 1);
 345 control_region_busy:
 346         /* If any errors are return, we drop the hwif interface. */
 347         return -EBUSY;
 348 }
 349
 350 /**
 351  *      ide_hwif_release_regions - free IDE resources
 352  *
 353  *      Note that we only release the standard ports,
 354  *      and do not even try to handle any extra ports
 355  *      allocated for weird IDE interface chipsets.
 356  *
 357  *      Note also that we don't yet handle mmio resources here. More
 358  *      importantly our caller should be doing this so we need to
 359  *      restructure this as a helper function for drivers.
 360  */
 361
 362 void ide_hwif_release_regions(ide_hwif_t *hwif)
 363 {
 364         u32 i = 0;
 365
 366         if (hwif->mmio)
 367                 return;
 368         if (hwif->io_ports[IDE_CONTROL_OFFSET])
 369                 release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
 370         if (hwif->straight8) {
 371                 release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
 372                 return;
 373         }
 374         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
 375                 if (hwif->io_ports[i])
 376                         release_region(hwif->io_ports[i], 1);
 377 }
 378
 379 /**
 380  *      ide_hwif_restore        -       restore hwif to template
 381  *      @hwif: hwif to update
 382  *      @tmp_hwif: template
 383  *
 384  *      Restore hwif to a previous state by copying most settings
 385  *      from the template.
 386  */
 387
 388 static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
 389 {
 390         hwif->hwgroup                   = tmp_hwif->hwgroup;
 391
 392         hwif->gendev.parent             = tmp_hwif->gendev.parent;
 393
 394         hwif->proc                      = tmp_hwif->proc;
 395
 396         hwif->major                     = tmp_hwif->major;
 397         hwif->straight8                 = tmp_hwif->straight8;
 398         hwif->bus_state                 = tmp_hwif->bus_state;
 399
 400         hwif->host_flags                = tmp_hwif->host_flags;
 401
 402         hwif->pio_mask                  = tmp_hwif->pio_mask;
 403
 404         hwif->ultra_mask                = tmp_hwif->ultra_mask;
 405         hwif->mwdma_mask                = tmp_hwif->mwdma_mask;
 406         hwif->swdma_mask                = tmp_hwif->swdma_mask;
 407
 408         hwif->cbl                       = tmp_hwif->cbl;
 409
 410         hwif->chipset                   = tmp_hwif->chipset;
 411         hwif->hold                      = tmp_hwif->hold;
 412
 413 #ifdef CONFIG_BLK_DEV_IDEPCI
 414         hwif->pci_dev                   = tmp_hwif->pci_dev;
 415         hwif->cds                       = tmp_hwif->cds;
 416 #endif
 417
 418         hwif->set_pio_mode              = tmp_hwif->set_pio_mode;
 419         hwif->set_dma_mode              = tmp_hwif->set_dma_mode;
 420         hwif->mdma_filter               = tmp_hwif->mdma_filter;
 421         hwif->udma_filter               = tmp_hwif->udma_filter;
 422         hwif->selectproc                = tmp_hwif->selectproc;
 423         hwif->reset_poll                = tmp_hwif->reset_poll;
 424         hwif->pre_reset                 = tmp_hwif->pre_reset;
 425         hwif->resetproc                 = tmp_hwif->resetproc;
 426         hwif->maskproc                  = tmp_hwif->maskproc;
 427         hwif->quirkproc                 = tmp_hwif->quirkproc;
 428         hwif->busproc                   = tmp_hwif->busproc;
 429
 430         hwif->ata_input_data            = tmp_hwif->ata_input_data;
 431         hwif->ata_output_data           = tmp_hwif->ata_output_data;
 432         hwif->atapi_input_bytes         = tmp_hwif->atapi_input_bytes;
 433         hwif->atapi_output_bytes        = tmp_hwif->atapi_output_bytes;
 434
 435         hwif->dma_host_set              = tmp_hwif->dma_host_set;
 436         hwif->dma_setup                 = tmp_hwif->dma_setup;
 437         hwif->dma_exec_cmd              = tmp_hwif->dma_exec_cmd;
 438         hwif->dma_start                 = tmp_hwif->dma_start;
 439         hwif->ide_dma_end               = tmp_hwif->ide_dma_end;
 440         hwif->ide_dma_test_irq          = tmp_hwif->ide_dma_test_irq;
 441         hwif->ide_dma_clear_irq         = tmp_hwif->ide_dma_clear_irq;
 442         hwif->dma_lost_irq              = tmp_hwif->dma_lost_irq;
 443         hwif->dma_timeout               = tmp_hwif->dma_timeout;
 444
 445         hwif->OUTB                      = tmp_hwif->OUTB;
 446         hwif->OUTBSYNC                  = tmp_hwif->OUTBSYNC;
 447         hwif->OUTW                      = tmp_hwif->OUTW;
 448         hwif->OUTSW                     = tmp_hwif->OUTSW;
 449         hwif->OUTSL                     = tmp_hwif->OUTSL;
 450
 451         hwif->INB                       = tmp_hwif->INB;
 452         hwif->INW                       = tmp_hwif->INW;
 453         hwif->INSW                      = tmp_hwif->INSW;
 454         hwif->INSL                      = tmp_hwif->INSL;
 455
 456         hwif->sg_max_nents              = tmp_hwif->sg_max_nents;
 457
 458         hwif->mmio                      = tmp_hwif->mmio;
 459         hwif->rqsize                    = tmp_hwif->rqsize;
 460
 461 #ifndef CONFIG_BLK_DEV_IDECS
 462         hwif->irq                       = tmp_hwif->irq;
 463 #endif
 464
 465         hwif->dma_base                  = tmp_hwif->dma_base;
 466         hwif->dma_command               = tmp_hwif->dma_command;
 467         hwif->dma_vendor1               = tmp_hwif->dma_vendor1;
 468         hwif->dma_status                = tmp_hwif->dma_status;
 469         hwif->dma_vendor3               = tmp_hwif->dma_vendor3;
 470         hwif->dma_prdtable              = tmp_hwif->dma_prdtable;
 471
 472         hwif->config_data               = tmp_hwif->config_data;
 473         hwif->select_data               = tmp_hwif->select_data;
 474         hwif->extra_base                = tmp_hwif->extra_base;
 475         hwif->extra_ports               = tmp_hwif->extra_ports;
 476
 477         hwif->hwif_data                 = tmp_hwif->hwif_data;
 478 }
 479
 480 /**
 481  *      ide_unregister          -       free an IDE interface
 482  *      @index: index of interface (will change soon to a pointer)
 483  *
 484  *      Perform the final unregister of an IDE interface. At the moment
 485  *      we don't refcount interfaces so this will also get split up.
 486  *
 487  *      Locking:
 488  *      The caller must not hold the IDE locks
 489  *      The drive present/vanishing is not yet properly locked
 490  *      Take care with the callbacks. These have been split to avoid
 491  *      deadlocking the IDE layer. The shutdown callback is called
 492  *      before we take the lock and free resources. It is up to the
 493  *      caller to be sure there is no pending I/O here, and that
 494  *      the interface will not be reopened (present/vanishing locking
 495  *      isn't yet done BTW). After we commit to the final kill we
 496  *      call the cleanup callback with the ide locks held.
 497  *
 498  *      Unregister restores the hwif structures to the default state.
 499  *      This is raving bonkers.
 500  */
 501
 502 void ide_unregister(unsigned int index)
 503 {
 504         ide_drive_t *drive;
 505         ide_hwif_t *hwif, *g;
 506         static ide_hwif_t tmp_hwif; /* protected by ide_cfg_mtx */
 507         ide_hwgroup_t *hwgroup;
 508         int irq_count = 0, unit;
 509
 510         BUG_ON(index >= MAX_HWIFS);
 511
 512         BUG_ON(in_interrupt());
 513         BUG_ON(irqs_disabled());
 514         mutex_lock(&ide_cfg_mtx);
 515         spin_lock_irq(&ide_lock);
 516         hwif = &ide_hwifs[index];
 517         if (!hwif->present)
 518                 goto abort;
 519         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 520                 drive = &hwif->drives[unit];
 521                 if (!drive->present)
 522                         continue;
 523                 spin_unlock_irq(&ide_lock);
 524                 device_unregister(&drive->gendev);
 525                 wait_for_completion(&drive->gendev_rel_comp);
 526                 spin_lock_irq(&ide_lock);
 527         }
 528         hwif->present = 0;
 529
 530         spin_unlock_irq(&ide_lock);
 531
 532         ide_proc_unregister_port(hwif);
 533
 534         hwgroup = hwif->hwgroup;
 535         /*
 536          * free the irq if we were the only hwif using it
 537          */
 538         g = hwgroup->hwif;
 539         do {
 540                 if (g->irq == hwif->irq)
 541                         ++irq_count;
 542                 g = g->next;
 543         } while (g != hwgroup->hwif);
 544         if (irq_count == 1)
 545                 free_irq(hwif->irq, hwgroup);
 546
 547         spin_lock_irq(&ide_lock);
 548         /*
 549          * Note that we only release the standard ports,
 550          * and do not even try to handle any extra ports
 551          * allocated for weird IDE interface chipsets.
 552          */
 553         ide_hwif_release_regions(hwif);
 554
 555         /*
 556          * Remove us from the hwgroup, and free
 557          * the hwgroup if we were the only member
 558          */
 559         if (hwif->next == hwif) {
 560                 BUG_ON(hwgroup->hwif != hwif);
 561                 kfree(hwgroup);
 562         } else {
 563                 /* There is another interface in hwgroup.
 564                  * Unlink us, and set hwgroup->drive and ->hwif to
 565                  * something sane.
 566                  */
 567                 g = hwgroup->hwif;
 568                 while (g->next != hwif)
 569                         g = g->next;
 570                 g->next = hwif->next;
 571                 if (hwgroup->hwif == hwif) {
 572                         /* Chose a random hwif for hwgroup->hwif.
 573                          * It's guaranteed that there are no drives
 574                          * left in the hwgroup.
 575                          */
 576                         BUG_ON(hwgroup->drive != NULL);
 577                         hwgroup->hwif = g;
 578                 }
 579                 BUG_ON(hwgroup->hwif == hwif);
 580         }
 581
 582         /* More messed up locking ... */
 583         spin_unlock_irq(&ide_lock);
 584         device_unregister(&hwif->gendev);
 585         wait_for_completion(&hwif->gendev_rel_comp);
 586
 587         /*
 588          * Remove us from the kernel's knowledge
 589          */
 590         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 591         kfree(hwif->sg_table);
 592         unregister_blkdev(hwif->major, hwif->name);
 593         spin_lock_irq(&ide_lock);
 594
 595         if (hwif->dma_base) {
 596                 (void) ide_release_dma(hwif);
 597
 598                 hwif->dma_base = 0;
 599                 hwif->dma_command = 0;
 600                 hwif->dma_vendor1 = 0;
 601                 hwif->dma_status = 0;
 602                 hwif->dma_vendor3 = 0;
 603                 hwif->dma_prdtable = 0;
 604
 605                 hwif->extra_base  = 0;
 606                 hwif->extra_ports = 0;
 607         }
 608
 609         /* copy original settings */
 610         tmp_hwif = *hwif;
 611
 612         /* restore hwif data to pristine status */
 613         ide_init_port_data(hwif, index);
 614         init_hwif_default(hwif, index);
 615
 616         ide_hwif_restore(hwif, &tmp_hwif);
 617
 618 abort:
 619         spin_unlock_irq(&ide_lock);
 620         mutex_unlock(&ide_cfg_mtx);
 621 }
 622
 623 EXPORT_SYMBOL(ide_unregister);
 624
 625
 626 /**
 627  *      ide_setup_ports         -       set up IDE interface ports
 628  *      @hw: register descriptions
 629  *      @base: base register
 630  *      @offsets: table of register offsets
 631  *      @ctrl: control register
 632  *      @ack_irq: IRQ ack
 633  *      @irq: interrupt lie
 634  *
 635  *      Setup hw_regs_t structure described by parameters.  You
 636  *      may set up the hw structure yourself OR use this routine to
 637  *      do it for you. This is basically a helper
 638  *
 639  */
 640
 641 void ide_setup_ports (  hw_regs_t *hw,
 642                         unsigned long base, int *offsets,
 643                         unsigned long ctrl, unsigned long intr,
 644                         ide_ack_intr_t *ack_intr,
 645 /*
 646  *                      ide_io_ops_t *iops,
 647  */
 648                         int irq)
 649 {
 650         int i;
 651
 652         memset(hw, 0, sizeof(hw_regs_t));
 653         for (i = 0; i < IDE_NR_PORTS; i++) {
 654                 if (offsets[i] == -1) {
 655                         switch(i) {
 656                                 case IDE_CONTROL_OFFSET:
 657                                         hw->io_ports[i] = ctrl;
 658                                         break;
 659 #if defined(CONFIG_AMIGA) || defined(CONFIG_MAC)
 660                                 case IDE_IRQ_OFFSET:
 661                                         hw->io_ports[i] = intr;
 662                                         break;
 663 #endif /* (CONFIG_AMIGA) || (CONFIG_MAC) */
 664                                 default:
 665                                         hw->io_ports[i] = 0;
 666                                         break;
 667                         }
 668                 } else {
 669                         hw->io_ports[i] = base + offsets[i];
 670                 }
 671         }
 672         hw->irq = irq;
 673         hw->ack_intr = ack_intr;
 674 /*
 675  *      hw->iops = iops;
 676  */
 677 }
 678
 679 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
 680 {
 681         memcpy(hwif->io_ports, hw->io_ports, sizeof(hwif->io_ports));
 682         hwif->irq = hw->irq;
 683         hwif->noprobe = 0;
 684         hwif->chipset = hw->chipset;
 685         hwif->gendev.parent = hw->dev;
 686         hwif->ack_intr = hw->ack_intr;
 687 }
 688 EXPORT_SYMBOL_GPL(ide_init_port_hw);
 689
 690 /**
 691  *      ide_register_hw         -       register IDE interface
 692  *      @hw: hardware registers
 693  *      @quirkproc: quirkproc function
 694  *      @hwifp: pointer to returned hwif
 695  *
 696  *      Register an IDE interface, specifying exactly the registers etc.
 697  *
 698  *      Returns -1 on error.
 699  */
 700
 701 int ide_register_hw(hw_regs_t *hw, void (*quirkproc)(ide_drive_t *),
 702                     ide_hwif_t **hwifp)
 703 {
 704         int index, retry = 1;
 705         ide_hwif_t *hwif;
 706         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
 707
 708         do {
 709                 for (index = 0; index < MAX_HWIFS; ++index) {
 710                         hwif = &ide_hwifs[index];
 711                         if (hwif->io_ports[IDE_DATA_OFFSET] == hw->io_ports[IDE_DATA_OFFSET])
 712                                 goto found;
 713                 }
 714                 for (index = 0; index < MAX_HWIFS; ++index) {
 715                         hwif = &ide_hwifs[index];
 716                         if (hwif->hold)
 717                                 continue;
 718                         if (!hwif->present && hwif->mate == NULL)
 719                                 goto found;
 720                 }
 721                 for (index = 0; index < MAX_HWIFS; index++)
 722                         ide_unregister(index);
 723         } while (retry--);
 724         return -1;
 725 found:
 726         if (hwif->present)
 727                 ide_unregister(index);
 728         else if (!hwif->hold) {
 729                 ide_init_port_data(hwif, index);
 730                 init_hwif_default(hwif, index);
 731         }
 732         if (hwif->present)
 733                 return -1;
 734
 735         ide_init_port_hw(hwif, hw);
 736         hwif->quirkproc = quirkproc;
 737
 738         idx[0] = index;
 739
 740         ide_device_add(idx);
 741
 742         if (hwifp)
 743                 *hwifp = hwif;
 744
 745         return hwif->present ? index : -1;
 746 }
 747
 748 EXPORT_SYMBOL(ide_register_hw);
 749
 750 /*
 751  *      Locks for IDE setting functionality
 752  */
 753
 754 DEFINE_MUTEX(ide_setting_mtx);
 755
 756 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 757
 758 /**
 759  *      ide_spin_wait_hwgroup   -       wait for group
 760  *      @drive: drive in the group
 761  *
 762  *      Wait for an IDE device group to go non busy and then return
 763  *      holding the ide_lock which guards the hwgroup->busy status
 764  *      and right to use it.
 765  */
 766
 767 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 768 {
 769         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 770         unsigned long timeout = jiffies + (3 * HZ);
 771
 772         spin_lock_irq(&ide_lock);
 773
 774         while (hwgroup->busy) {
 775                 unsigned long lflags;
 776                 spin_unlock_irq(&ide_lock);
 777                 local_irq_set(lflags);
 778                 if (time_after(jiffies, timeout)) {
 779                         local_irq_restore(lflags);
 780                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 781                         return -EBUSY;
 782                 }
 783                 local_irq_restore(lflags);
 784                 spin_lock_irq(&ide_lock);
 785         }
 786         return 0;
 787 }
 788
 789 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 790
 791 int set_io_32bit(ide_drive_t *drive, int arg)
 792 {
 793         if (drive->no_io_32bit)
 794                 return -EPERM;
 795
 796         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 797                 return -EINVAL;
 798
 799         if (ide_spin_wait_hwgroup(drive))
 800                 return -EBUSY;
 801
 802         drive->io_32bit = arg;
 803 #ifdef CONFIG_BLK_DEV_DTC2278
 804         if (HWIF(drive)->chipset == ide_dtc2278)
 805                 HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
 806 #endif /* CONFIG_BLK_DEV_DTC2278 */
 807
 808         spin_unlock_irq(&ide_lock);
 809
 810         return 0;
 811 }
 812
 813 static int set_ksettings(ide_drive_t *drive, int arg)
 814 {
 815         if (arg < 0 || arg > 1)
 816                 return -EINVAL;
 817
 818         if (ide_spin_wait_hwgroup(drive))
 819                 return -EBUSY;
 820         drive->keep_settings = arg;
 821         spin_unlock_irq(&ide_lock);
 822
 823         return 0;
 824 }
 825
 826 int set_using_dma(ide_drive_t *drive, int arg)
 827 {
 828 #ifdef CONFIG_BLK_DEV_IDEDMA
 829         ide_hwif_t *hwif = drive->hwif;
 830         int err = -EPERM;
 831
 832         if (arg < 0 || arg > 1)
 833                 return -EINVAL;
 834
 835         if (!drive->id || !(drive->id->capability & 1))
 836                 goto out;
 837
 838         if (hwif->dma_host_set == NULL)
 839                 goto out;
 840
 841         err = -EBUSY;
 842         if (ide_spin_wait_hwgroup(drive))
 843                 goto out;
 844         /*
 845          * set ->busy flag, unlock and let it ride
 846          */
 847         hwif->hwgroup->busy = 1;
 848         spin_unlock_irq(&ide_lock);
 849
 850         err = 0;
 851
 852         if (arg) {
 853                 if (ide_set_dma(drive))
 854                         err = -EIO;
 855         } else
 856                 ide_dma_off(drive);
 857
 858         /*
 859          * lock, clear ->busy flag and unlock before leaving
 860          */
 861         spin_lock_irq(&ide_lock);
 862         hwif->hwgroup->busy = 0;
 863         spin_unlock_irq(&ide_lock);
 864 out:
 865         return err;
 866 #else
 867         if (arg < 0 || arg > 1)
 868                 return -EINVAL;
 869
 870         return -EPERM;
 871 #endif
 872 }
 873
 874 int set_pio_mode(ide_drive_t *drive, int arg)
 875 {
 876         struct request rq;
 877
 878         if (arg < 0 || arg > 255)
 879                 return -EINVAL;
 880
 881         if (drive->hwif->set_pio_mode == NULL)
 882                 return -ENOSYS;
 883
 884         if (drive->special.b.set_tune)
 885                 return -EBUSY;
 886         ide_init_drive_cmd(&rq);
 887         drive->tune_req = (u8) arg;
 888         drive->special.b.set_tune = 1;
 889         (void) ide_do_drive_cmd(drive, &rq, ide_wait);
 890         return 0;
 891 }
 892
 893 static int set_unmaskirq(ide_drive_t *drive, int arg)
 894 {
 895         if (drive->no_unmask)
 896                 return -EPERM;
 897
 898         if (arg < 0 || arg > 1)
 899                 return -EINVAL;
 900
 901         if (ide_spin_wait_hwgroup(drive))
 902                 return -EBUSY;
 903         drive->unmask = arg;
 904         spin_unlock_irq(&ide_lock);
 905
 906         return 0;
 907 }
 908
 909 /**
 910  *      system_bus_clock        -       clock guess
 911  *
 912  *      External version of the bus clock guess used by very old IDE drivers
 913  *      for things like VLB timings. Should not be used.
 914  */
 915
 916 int system_bus_clock (void)
 917 {
 918         return((int) ((!system_bus_speed) ? ide_system_bus_speed() : system_bus_speed ));
 919 }
 920
 921 EXPORT_SYMBOL(system_bus_clock);
 922
 923 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 924 {
 925         ide_drive_t *drive = dev->driver_data;
 926         ide_hwif_t *hwif = HWIF(drive);
 927         struct request rq;
 928         struct request_pm_state rqpm;
 929         ide_task_t args;
 930         int ret;
 931
 932         /* Call ACPI _GTM only once */
 933         if (!(drive->dn % 2))
 934                 ide_acpi_get_timing(hwif);
 935
 936         memset(&rq, 0, sizeof(rq));
 937         memset(&rqpm, 0, sizeof(rqpm));
 938         memset(&args, 0, sizeof(args));
 939         rq.cmd_type = REQ_TYPE_PM_SUSPEND;
 940         rq.special = &args;
 941         rq.data = &rqpm;
 942         rqpm.pm_step = ide_pm_state_start_suspend;
 943         if (mesg.event == PM_EVENT_PRETHAW)
 944                 mesg.event = PM_EVENT_FREEZE;
 945         rqpm.pm_state = mesg.event;
 946
 947         ret = ide_do_drive_cmd(drive, &rq, ide_wait);
 948         /* only call ACPI _PS3 after both drivers are suspended */
 949         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 950                  && hwif->drives[1].present)
 951                  || !hwif->drives[0].present
 952                  || !hwif->drives[1].present))
 953                 ide_acpi_set_state(hwif, 0);
 954         return ret;
 955 }
 956
 957 static int generic_ide_resume(struct device *dev)
 958 {
 959         ide_drive_t *drive = dev->driver_data;
 960         ide_hwif_t *hwif = HWIF(drive);
 961         struct request rq;
 962         struct request_pm_state rqpm;
 963         ide_task_t args;
 964         int err;
 965
 966         /* Call ACPI _STM only once */
 967         if (!(drive->dn % 2)) {
 968                 ide_acpi_set_state(hwif, 1);
 969                 ide_acpi_push_timing(hwif);
 970         }
 971
 972         ide_acpi_exec_tfs(drive);
 973
 974         memset(&rq, 0, sizeof(rq));
 975         memset(&rqpm, 0, sizeof(rqpm));
 976         memset(&args, 0, sizeof(args));
 977         rq.cmd_type = REQ_TYPE_PM_RESUME;
 978         rq.special = &args;
 979         rq.data = &rqpm;
 980         rqpm.pm_step = ide_pm_state_start_resume;
 981         rqpm.pm_state = PM_EVENT_ON;
 982
 983         err = ide_do_drive_cmd(drive, &rq, ide_head_wait);
 984
 985         if (err == 0 && dev->driver) {
 986                 ide_driver_t *drv = to_ide_driver(dev->driver);
 987
 988                 if (drv->resume)
 989                         drv->resume(drive);
 990         }
 991
 992         return err;
 993 }
 994
 995 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 996                         unsigned int cmd, unsigned long arg)
 997 {
 998         unsigned long flags;
 999         ide_driver_t *drv;
1000         void __user *p = (void __user *)arg;
1001         int err = 0, (*setfunc)(ide_drive_t *, int);
1002         u8 *val;
1003
1004         switch (cmd) {
1005         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
1006         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
1007         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
1008         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
1009         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
1010         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
1011         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
1012         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
1013         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
1014         }
1015
1016         switch (cmd) {
1017                 case HDIO_OBSOLETE_IDENTITY:
1018                 case HDIO_GET_IDENTITY:
1019                         if (bdev != bdev->bd_contains)
1020                                 return -EINVAL;
1021                         if (drive->id_read == 0)
1022                                 return -ENOMSG;
1023                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
1024                                 return -EFAULT;
1025                         return 0;
1026
1027                 case HDIO_GET_NICE:
1028                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
1029                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
1030                                         drive->nice0            <<      IDE_NICE_0              |
1031                                         drive->nice1            <<      IDE_NICE_1              |
1032                                         drive->nice2            <<      IDE_NICE_2,
1033                                         (long __user *) arg);
1034
1035 #ifdef CONFIG_IDE_TASK_IOCTL
1036                 case HDIO_DRIVE_TASKFILE:
1037                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1038                                 return -EACCES;
1039                         switch(drive->media) {
1040                                 case ide_disk:
1041                                         return ide_taskfile_ioctl(drive, cmd, arg);
1042                                 default:
1043                                         return -ENOMSG;
1044                         }
1045 #endif /* CONFIG_IDE_TASK_IOCTL */
1046
1047                 case HDIO_DRIVE_CMD:
1048                         if (!capable(CAP_SYS_RAWIO))
1049                                 return -EACCES;
1050                         return ide_cmd_ioctl(drive, cmd, arg);
1051
1052                 case HDIO_DRIVE_TASK:
1053                         if (!capable(CAP_SYS_RAWIO))
1054                                 return -EACCES;
1055                         return ide_task_ioctl(drive, cmd, arg);
1056
1057                 case HDIO_SCAN_HWIF:
1058                 {
1059                         hw_regs_t hw;
1060                         int args[3];
1061                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1062                         if (copy_from_user(args, p, 3 * sizeof(int)))
1063                                 return -EFAULT;
1064                         memset(&hw, 0, sizeof(hw));
1065                         ide_init_hwif_ports(&hw, (unsigned long) args[0],
1066                                             (unsigned long) args[1], NULL);
1067                         hw.irq = args[2];
1068                         if (ide_register_hw(&hw, NULL, NULL) == -1)
1069                                 return -EIO;
1070                         return 0;
1071                 }
1072                 case HDIO_UNREGISTER_HWIF:
1073                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1074                         /* (arg > MAX_HWIFS) checked in function */
1075                         ide_unregister(arg);
1076                         return 0;
1077                 case HDIO_SET_NICE:
1078                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1079                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
1080                                 return -EPERM;
1081                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
1082                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
1083                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
1084                                 drive->dsc_overlap = 0;
1085                                 return -EPERM;
1086                         }
1087                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
1088                         return 0;
1089                 case HDIO_DRIVE_RESET:
1090                 {
1091                         unsigned long flags;
1092                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1093
1094                         /*
1095                          *      Abort the current command on the
1096                          *      group if there is one, taking
1097                          *      care not to allow anything else
1098                          *      to be queued and to die on the
1099                          *      spot if we miss one somehow
1100                          */
1101
1102                         spin_lock_irqsave(&ide_lock, flags);
1103
1104                         if (HWGROUP(drive)->resetting) {
1105                                 spin_unlock_irqrestore(&ide_lock, flags);
1106                                 return -EBUSY;
1107                         }
1108
1109                         ide_abort(drive, "drive reset");
1110
1111                         BUG_ON(HWGROUP(drive)->handler);
1112
1113                         /* Ensure nothing gets queued after we
1114                            drop the lock. Reset will clear the busy */
1115
1116                         HWGROUP(drive)->busy = 1;
1117                         spin_unlock_irqrestore(&ide_lock, flags);
1118                         (void) ide_do_reset(drive);
1119
1120                         return 0;
1121                 }
1122
1123                 case HDIO_GET_BUSSTATE:
1124                         if (!capable(CAP_SYS_ADMIN))
1125                                 return -EACCES;
1126                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
1127                                 return -EFAULT;
1128                         return 0;
1129
1130                 case HDIO_SET_BUSSTATE:
1131                         if (!capable(CAP_SYS_ADMIN))
1132                                 return -EACCES;
1133                         if (HWIF(drive)->busproc)
1134                                 return HWIF(drive)->busproc(drive, (int)arg);
1135                         return -EOPNOTSUPP;
1136                 default:
1137                         return -EINVAL;
1138         }
1139
1140 read_val:
1141         mutex_lock(&ide_setting_mtx);
1142         spin_lock_irqsave(&ide_lock, flags);
1143         err = *val;
1144         spin_unlock_irqrestore(&ide_lock, flags);
1145         mutex_unlock(&ide_setting_mtx);
1146         return err >= 0 ? put_user(err, (long __user *)arg) : err;
1147
1148 set_val:
1149         if (bdev != bdev->bd_contains)
1150                 err = -EINVAL;
1151         else {
1152                 if (!capable(CAP_SYS_ADMIN))
1153                         err = -EACCES;
1154                 else {
1155                         mutex_lock(&ide_setting_mtx);
1156                         err = setfunc(drive, arg);
1157                         mutex_unlock(&ide_setting_mtx);
1158                 }
1159         }
1160         return err;
1161 }
1162
1163 EXPORT_SYMBOL(generic_ide_ioctl);
1164
1165 /*
1166  * stridx() returns the offset of c within s,
1167  * or -1 if c is '\0' or not found within s.
1168  */
1169 static int __init stridx (const char *s, char c)
1170 {
1171         char *i = strchr(s, c);
1172         return (i && c) ? i - s : -1;
1173 }
1174
1175 /*
1176  * match_parm() does parsing for ide_setup():
1177  *
1178  * 1. the first char of s must be '='.
1179  * 2. if the remainder matches one of the supplied keywords,
1180  *     the index (1 based) of the keyword is negated and returned.
1181  * 3. if the remainder is a series of no more than max_vals numbers
1182  *     separated by commas, the numbers are saved in vals[] and a
1183  *     count of how many were saved is returned.  Base10 is assumed,
1184  *     and base16 is allowed when prefixed with "0x".
1185  * 4. otherwise, zero is returned.
1186  */
1187 static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
1188 {
1189         static const char *decimal = "0123456789";
1190         static const char *hex = "0123456789abcdef";
1191         int i, n;
1192
1193         if (*s++ == '=') {
1194                 /*
1195                  * Try matching against the supplied keywords,
1196                  * and return -(index+1) if we match one
1197                  */
1198                 if (keywords != NULL) {
1199                         for (i = 0; *keywords != NULL; ++i) {
1200                                 if (!strcmp(s, *keywords++))
1201                                         return -(i+1);
1202                         }
1203                 }
1204                 /*
1205                  * Look for a series of no more than "max_vals"
1206                  * numeric values separated by commas, in base10,
1207                  * or base16 when prefixed with "0x".
1208                  * Return a count of how many were found.
1209                  */
1210                 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
1211                         vals[n] = i;
1212                         while ((i = stridx(decimal, *++s)) >= 0)
1213                                 vals[n] = (vals[n] * 10) + i;
1214                         if (*s == 'x' && !vals[n]) {
1215                                 while ((i = stridx(hex, *++s)) >= 0)
1216                                         vals[n] = (vals[n] * 0x10) + i;
1217                         }
1218                         if (++n == max_vals)
1219                                 break;
1220                         if (*s == ',' || *s == ';')
1221                                 ++s;
1222                 }
1223                 if (!*s)
1224                         return n;
1225         }
1226         return 0;       /* zero = nothing matched */
1227 }
1228
1229 #ifdef CONFIG_BLK_DEV_ALI14XX
1230 extern int probe_ali14xx;
1231 extern int ali14xx_init(void);
1232 #endif
1233 #ifdef CONFIG_BLK_DEV_UMC8672
1234 extern int probe_umc8672;
1235 extern int umc8672_init(void);
1236 #endif
1237 #ifdef CONFIG_BLK_DEV_DTC2278
1238 extern int probe_dtc2278;
1239 extern int dtc2278_init(void);
1240 #endif
1241 #ifdef CONFIG_BLK_DEV_HT6560B
1242 extern int probe_ht6560b;
1243 extern int ht6560b_init(void);
1244 #endif
1245 #ifdef CONFIG_BLK_DEV_QD65XX
1246 extern int probe_qd65xx;
1247 extern int qd65xx_init(void);
1248 #endif
1249
1250 static int __initdata is_chipset_set[MAX_HWIFS];
1251
1252 /*
1253  * ide_setup() gets called VERY EARLY during initialization,
1254  * to handle kernel "command line" strings beginning with "hdx=" or "ide".
1255  *
1256  * Remember to update Documentation/ide.txt if you change something here.
1257  */
1258 static int __init ide_setup(char *s)
1259 {
1260         int i, vals[3];
1261         ide_hwif_t *hwif;
1262         ide_drive_t *drive;
1263         unsigned int hw, unit;
1264         const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
1265         const char max_hwif  = '0' + (MAX_HWIFS - 1);
1266
1267
1268         if (strncmp(s,"hd",2) == 0 && s[2] == '=')      /* hd= is for hd.c   */
1269                 return 0;                               /* driver and not us */
1270
1271         if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
1272                 return 0;
1273
1274         printk(KERN_INFO "ide_setup: %s", s);
1275         init_ide_data ();
1276
1277 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
1278         if (!strcmp(s, "ide=doubler")) {
1279                 extern int ide_doubler;
1280
1281                 printk(" : Enabled support for IDE doublers\n");
1282                 ide_doubler = 1;
1283                 return 1;
1284         }
1285 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
1286
1287         if (!strcmp(s, "ide=nodma")) {
1288                 printk(" : Prevented DMA\n");
1289                 noautodma = 1;
1290                 goto obsolete_option;
1291         }
1292
1293 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
1294         if (!strcmp(s, "ide=reverse")) {
1295                 ide_scan_direction = 1;
1296                 printk(" : Enabled support for IDE inverse scan order.\n");
1297                 return 1;
1298         }
1299 #endif
1300
1301 #ifdef CONFIG_BLK_DEV_IDEACPI
1302         if (!strcmp(s, "ide=noacpi")) {
1303                 //printk(" : Disable IDE ACPI support.\n");
1304                 ide_noacpi = 1;
1305                 return 1;
1306         }
1307         if (!strcmp(s, "ide=acpigtf")) {
1308                 //printk(" : Enable IDE ACPI _GTF support.\n");
1309                 ide_noacpitfs = 0;
1310                 return 1;
1311         }
1312         if (!strcmp(s, "ide=acpionboot")) {
1313                 //printk(" : Call IDE ACPI methods on boot.\n");
1314                 ide_noacpionboot = 0;
1315                 return 1;
1316         }
1317 #endif /* CONFIG_BLK_DEV_IDEACPI */
1318
1319         /*
1320          * Look for drive options:  "hdx="
1321          */
1322         if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
1323                 const char *hd_words[] = {
1324                         "none", "noprobe", "nowerr", "cdrom", "nodma",
1325                         "autotune", "noautotune", "minus8", "swapdata", "bswap",
1326                         "noflush", "remap", "remap63", "scsi", NULL };
1327                 unit = s[2] - 'a';
1328                 hw   = unit / MAX_DRIVES;
1329                 unit = unit % MAX_DRIVES;
1330                 hwif = &ide_hwifs[hw];
1331                 drive = &hwif->drives[unit];
1332                 if (strncmp(s + 4, "ide-", 4) == 0) {
1333                         strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
1334                         goto done;
1335                 }
1336                 switch (match_parm(&s[3], hd_words, vals, 3)) {
1337                         case -1: /* "none" */
1338                         case -2: /* "noprobe" */
1339                                 drive->noprobe = 1;
1340                                 goto done;
1341                         case -3: /* "nowerr" */
1342                                 drive->bad_wstat = BAD_R_STAT;
1343                                 hwif->noprobe = 0;
1344                                 goto done;
1345                         case -4: /* "cdrom" */
1346                                 drive->present = 1;
1347                                 drive->media = ide_cdrom;
1348                                 /* an ATAPI device ignores DRDY */
1349                                 drive->ready_stat = 0;
1350                                 hwif->noprobe = 0;
1351                                 goto done;
1352                         case -5: /* nodma */
1353                                 drive->nodma = 1;
1354                                 goto done;
1355                         case -6: /* "autotune" */
1356                                 drive->autotune = IDE_TUNE_AUTO;
1357                                 goto obsolete_option;
1358                         case -7: /* "noautotune" */
1359                                 drive->autotune = IDE_TUNE_NOAUTO;
1360                                 goto obsolete_option;
1361                         case -9: /* "swapdata" */
1362                         case -10: /* "bswap" */
1363                                 drive->bswap = 1;
1364                                 goto done;
1365                         case -11: /* noflush */
1366                                 drive->noflush = 1;
1367                                 goto done;
1368                         case -12: /* "remap" */
1369                                 drive->remap_0_to_1 = 1;
1370                                 goto done;
1371                         case -13: /* "remap63" */
1372                                 drive->sect0 = 63;
1373                                 goto done;
1374                         case -14: /* "scsi" */
1375                                 drive->scsi = 1;
1376                                 goto done;
1377                         case 3: /* cyl,head,sect */
1378                                 drive->media    = ide_disk;
1379                                 drive->ready_stat = READY_STAT;
1380                                 drive->cyl      = drive->bios_cyl  = vals[0];
1381                                 drive->head     = drive->bios_head = vals[1];
1382                                 drive->sect     = drive->bios_sect = vals[2];
1383                                 drive->present  = 1;
1384                                 drive->forced_geom = 1;
1385                                 hwif->noprobe = 0;
1386                                 goto done;
1387                         default:
1388                                 goto bad_option;
1389                 }
1390         }
1391
1392         if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
1393                 goto bad_option;
1394         /*
1395          * Look for bus speed option:  "idebus="
1396          */
1397         if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
1398                 if (match_parm(&s[6], NULL, vals, 1) != 1)
1399                         goto bad_option;
1400                 if (vals[0] >= 20 && vals[0] <= 66) {
1401                         idebus_parameter = vals[0];
1402                 } else
1403                         printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
1404                 goto done;
1405         }
1406         /*
1407          * Look for interface options:  "idex="
1408          */
1409         if (s[3] >= '0' && s[3] <= max_hwif) {
1410                 /*
1411                  * Be VERY CAREFUL changing this: note hardcoded indexes below
1412                  * (-8, -9, -10) are reserved to ease the hardcoding.
1413                  */
1414                 static const char *ide_words[] = {
1415                         "noprobe", "serialize", "minus3", "minus4",
1416                         "reset", "minus6", "ata66", "minus8", "minus9",
1417                         "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
1418                         "dtc2278", "umc8672", "ali14xx", NULL };
1419
1420                 hw_regs_t hwregs;
1421
1422                 hw = s[3] - '0';
1423                 hwif = &ide_hwifs[hw];
1424                 i = match_parm(&s[4], ide_words, vals, 3);
1425
1426                 /*
1427                  * Cryptic check to ensure chipset not already set for hwif.
1428                  * Note: we can't depend on hwif->chipset here.
1429                  */
1430                 if ((i >= -18 && i <= -11) || (i > 0 && i <= 3)) {
1431                         /* chipset already specified */
1432                         if (is_chipset_set[hw])
1433                                 goto bad_option;
1434                         if (i > -18 && i <= -11) {
1435                                 /* these drivers are for "ide0=" only */
1436                                 if (hw != 0)
1437                                         goto bad_hwif;
1438                                 /* chipset already specified for 2nd port */
1439                                 if (is_chipset_set[hw+1])
1440                                         goto bad_option;
1441                         }
1442                         is_chipset_set[hw] = 1;
1443                         printk("\n");
1444                 }
1445
1446                 switch (i) {
1447 #ifdef CONFIG_BLK_DEV_ALI14XX
1448                         case -17: /* "ali14xx" */
1449                                 probe_ali14xx = 1;
1450                                 goto done;
1451 #endif
1452 #ifdef CONFIG_BLK_DEV_UMC8672
1453                         case -16: /* "umc8672" */
1454                                 probe_umc8672 = 1;
1455                                 goto done;
1456 #endif
1457 #ifdef CONFIG_BLK_DEV_DTC2278
1458                         case -15: /* "dtc2278" */
1459                                 probe_dtc2278 = 1;
1460                                 goto done;
1461 #endif
1462 #ifdef CONFIG_BLK_DEV_CMD640
1463                         case -14: /* "cmd640_vlb" */
1464                         {
1465                                 extern int cmd640_vlb; /* flag for cmd640.c */
1466                                 cmd640_vlb = 1;
1467                                 goto done;
1468                         }
1469 #endif
1470 #ifdef CONFIG_BLK_DEV_HT6560B
1471                         case -13: /* "ht6560b" */
1472                                 probe_ht6560b = 1;
1473                                 goto done;
1474 #endif
1475 #ifdef CONFIG_BLK_DEV_QD65XX
1476                         case -12: /* "qd65xx" */
1477                                 probe_qd65xx = 1;
1478                                 goto done;
1479 #endif
1480 #ifdef CONFIG_BLK_DEV_4DRIVES
1481                         case -11: /* "four" drives on one set of ports */
1482                         {
1483                                 ide_hwif_t *mate = &ide_hwifs[hw^1];
1484                                 mate->drives[0].select.all ^= 0x20;
1485                                 mate->drives[1].select.all ^= 0x20;
1486                                 hwif->chipset = mate->chipset = ide_4drives;
1487                                 mate->irq = hwif->irq;
1488                                 memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
1489                                 hwif->mate = mate;
1490                                 mate->mate = hwif;
1491                                 hwif->serialized = mate->serialized = 1;
1492                                 goto obsolete_option;
1493                         }
1494 #endif /* CONFIG_BLK_DEV_4DRIVES */
1495                         case -10: /* minus10 */
1496                         case -9: /* minus9 */
1497                         case -8: /* minus8 */
1498                         case -6:
1499                         case -4:
1500                         case -3:
1501                                 goto bad_option;
1502                         case -7: /* ata66 */
1503 #ifdef CONFIG_BLK_DEV_IDEPCI
1504                                 /*
1505                                  * Use ATA_CBL_PATA40_SHORT so drive side
1506                                  * cable detection is also overriden.
1507                                  */
1508                                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1509                                 goto obsolete_option;
1510 #else
1511                                 goto bad_hwif;
1512 #endif
1513                         case -5: /* "reset" */
1514                                 hwif->reset = 1;
1515                                 goto obsolete_option;
1516                         case -2: /* "serialize" */
1517                                 hwif->mate = &ide_hwifs[hw^1];
1518                                 hwif->mate->mate = hwif;
1519                                 hwif->serialized = hwif->mate->serialized = 1;
1520                                 goto obsolete_option;
1521
1522                         case -1: /* "noprobe" */
1523                                 hwif->noprobe = 1;
1524                                 goto done;
1525
1526                         case 1: /* base */
1527                                 vals[1] = vals[0] + 0x206; /* default ctl */
1528                         case 2: /* base,ctl */
1529                                 vals[2] = 0;    /* default irq = probe for it */
1530                         case 3: /* base,ctl,irq */
1531                                 memset(&hwregs, 0, sizeof(hwregs));
1532                                 ide_init_hwif_ports(&hwregs, vals[0], vals[1], &hwif->irq);
1533                                 memcpy(hwif->io_ports, hwregs.io_ports, sizeof(hwif->io_ports));
1534                                 hwif->irq      = vals[2];
1535                                 hwif->noprobe  = 0;
1536                                 hwif->chipset  = ide_forced;
1537                                 goto obsolete_option;
1538
1539                         case 0: goto bad_option;
1540                         default:
1541                                 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
1542                                 return 1;
1543                 }
1544         }
1545 bad_option:
1546         printk(" -- BAD OPTION\n");
1547         return 1;
1548 obsolete_option:
1549         printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
1550         return 1;
1551 bad_hwif:
1552         printk("-- NOT SUPPORTED ON ide%d", hw);
1553 done:
1554         printk("\n");
1555         return 1;
1556 }
1557
1558 extern void __init pnpide_init(void);
1559 extern void __exit pnpide_exit(void);
1560 extern void __init h8300_ide_init(void);
1561
1562 /*
1563  * probe_for_hwifs() finds/initializes "known" IDE interfaces
1564  */
1565 static void __init probe_for_hwifs (void)
1566 {
1567 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
1568         ide_scan_pcibus(ide_scan_direction);
1569 #endif
1570
1571 #ifdef CONFIG_ETRAX_IDE
1572         {
1573                 extern void init_e100_ide(void);
1574                 init_e100_ide();
1575         }
1576 #endif /* CONFIG_ETRAX_IDE */
1577 #ifdef CONFIG_BLK_DEV_CMD640
1578         {
1579                 extern void ide_probe_for_cmd640x(void);
1580                 ide_probe_for_cmd640x();
1581         }
1582 #endif /* CONFIG_BLK_DEV_CMD640 */
1583 #ifdef CONFIG_BLK_DEV_IDE_PMAC
1584         {
1585                 extern int pmac_ide_probe(void);
1586                 (void)pmac_ide_probe();
1587         }
1588 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
1589 #ifdef CONFIG_BLK_DEV_GAYLE
1590         {
1591                 extern void gayle_init(void);
1592                 gayle_init();
1593         }
1594 #endif /* CONFIG_BLK_DEV_GAYLE */
1595 #ifdef CONFIG_BLK_DEV_FALCON_IDE
1596         {
1597                 extern void falconide_init(void);
1598                 falconide_init();
1599         }
1600 #endif /* CONFIG_BLK_DEV_FALCON_IDE */
1601 #ifdef CONFIG_BLK_DEV_MAC_IDE
1602         {
1603                 extern void macide_init(void);
1604                 macide_init();
1605         }
1606 #endif /* CONFIG_BLK_DEV_MAC_IDE */
1607 #ifdef CONFIG_BLK_DEV_Q40IDE
1608         {
1609                 extern void q40ide_init(void);
1610                 q40ide_init();
1611         }
1612 #endif /* CONFIG_BLK_DEV_Q40IDE */
1613 #ifdef CONFIG_BLK_DEV_BUDDHA
1614         {
1615                 extern void buddha_init(void);
1616                 buddha_init();
1617         }
1618 #endif /* CONFIG_BLK_DEV_BUDDHA */
1619 #ifdef CONFIG_BLK_DEV_IDEPNP
1620         pnpide_init();
1621 #endif
1622 #ifdef CONFIG_H8300
1623         h8300_ide_init();
1624 #endif
1625 }
1626
1627 /*
1628  * Probe module
1629  */
1630
1631 EXPORT_SYMBOL(ide_lock);
1632
1633 static int ide_bus_match(struct device *dev, struct device_driver *drv)
1634 {
1635         return 1;
1636 }
1637
1638 static char *media_string(ide_drive_t *drive)
1639 {
1640         switch (drive->media) {
1641         case ide_disk:
1642                 return "disk";
1643         case ide_cdrom:
1644                 return "cdrom";
1645         case ide_tape:
1646                 return "tape";
1647         case ide_floppy:
1648                 return "floppy";
1649         case ide_optical:
1650                 return "optical";
1651         default:
1652                 return "UNKNOWN";
1653         }
1654 }
1655
1656 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
1657 {
1658         ide_drive_t *drive = to_ide_device(dev);
1659         return sprintf(buf, "%s\n", media_string(drive));
1660 }
1661
1662 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
1663 {
1664         ide_drive_t *drive = to_ide_device(dev);
1665         return sprintf(buf, "%s\n", drive->name);
1666 }
1667
1668 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1669 {
1670         ide_drive_t *drive = to_ide_device(dev);
1671         return sprintf(buf, "ide:m-%s\n", media_string(drive));
1672 }
1673
1674 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
1675                           char *buf)
1676 {
1677         ide_drive_t *drive = to_ide_device(dev);
1678         return sprintf(buf, "%s\n", drive->id->model);
1679 }
1680
1681 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
1682                              char *buf)
1683 {
1684         ide_drive_t *drive = to_ide_device(dev);
1685         return sprintf(buf, "%s\n", drive->id->fw_rev);
1686 }
1687
1688 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
1689                            char *buf)
1690 {
1691         ide_drive_t *drive = to_ide_device(dev);
1692         return sprintf(buf, "%s\n", drive->id->serial_no);
1693 }
1694
1695 static struct device_attribute ide_dev_attrs[] = {
1696         __ATTR_RO(media),
1697         __ATTR_RO(drivename),
1698         __ATTR_RO(modalias),
1699         __ATTR_RO(model),
1700         __ATTR_RO(firmware),
1701         __ATTR(serial, 0400, serial_show, NULL),
1702         __ATTR_NULL
1703 };
1704
1705 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
1706 {
1707         ide_drive_t *drive = to_ide_device(dev);
1708
1709         add_uevent_var(env, "MEDIA=%s", media_string(drive));
1710         add_uevent_var(env, "DRIVENAME=%s", drive->name);
1711         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
1712         return 0;
1713 }
1714
1715 static int generic_ide_probe(struct device *dev)
1716 {
1717         ide_drive_t *drive = to_ide_device(dev);
1718         ide_driver_t *drv = to_ide_driver(dev->driver);
1719
1720         return drv->probe ? drv->probe(drive) : -ENODEV;
1721 }
1722
1723 static int generic_ide_remove(struct device *dev)
1724 {
1725         ide_drive_t *drive = to_ide_device(dev);
1726         ide_driver_t *drv = to_ide_driver(dev->driver);
1727
1728         if (drv->remove)
1729                 drv->remove(drive);
1730
1731         return 0;
1732 }
1733
1734 static void generic_ide_shutdown(struct device *dev)
1735 {
1736         ide_drive_t *drive = to_ide_device(dev);
1737         ide_driver_t *drv = to_ide_driver(dev->driver);
1738
1739         if (dev->driver && drv->shutdown)
1740                 drv->shutdown(drive);
1741 }
1742
1743 struct bus_type ide_bus_type = {
1744         .name           = "ide",
1745         .match          = ide_bus_match,
1746         .uevent         = ide_uevent,
1747         .probe          = generic_ide_probe,
1748         .remove         = generic_ide_remove,
1749         .shutdown       = generic_ide_shutdown,
1750         .dev_attrs      = ide_dev_attrs,
1751         .suspend        = generic_ide_suspend,
1752         .resume         = generic_ide_resume,
1753 };
1754
1755 EXPORT_SYMBOL_GPL(ide_bus_type);
1756
1757 /*
1758  * This is gets invoked once during initialization, to set *everything* up
1759  */
1760 static int __init ide_init(void)
1761 {
1762         int ret;
1763
1764         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver " REVISION "\n");
1765         system_bus_speed = ide_system_bus_speed();
1766
1767         ret = bus_register(&ide_bus_type);
1768         if (ret < 0) {
1769                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1770                 return ret;
1771         }
1772
1773         init_ide_data();
1774
1775         proc_ide_create();
1776
1777 #ifdef CONFIG_BLK_DEV_ALI14XX
1778         if (probe_ali14xx)
1779                 (void)ali14xx_init();
1780 #endif
1781 #ifdef CONFIG_BLK_DEV_UMC8672
1782         if (probe_umc8672)
1783                 (void)umc8672_init();
1784 #endif
1785 #ifdef CONFIG_BLK_DEV_DTC2278
1786         if (probe_dtc2278)
1787                 (void)dtc2278_init();
1788 #endif
1789 #ifdef CONFIG_BLK_DEV_HT6560B
1790         if (probe_ht6560b)
1791                 (void)ht6560b_init();
1792 #endif
1793 #ifdef CONFIG_BLK_DEV_QD65XX
1794         if (probe_qd65xx)
1795                 (void)qd65xx_init();
1796 #endif
1797
1798         /* Probe for special PCI and other "known" interface chipsets. */
1799         probe_for_hwifs();
1800
1801         return 0;
1802 }
1803
1804 #ifdef MODULE
1805 static char *options = NULL;
1806 module_param(options, charp, 0);
1807 MODULE_LICENSE("GPL");
1808
1809 static void __init parse_options (char *line)
1810 {
1811         char *next = line;
1812
1813         if (line == NULL || !*line)
1814                 return;
1815         while ((line = next) != NULL) {
1816                 if ((next = strchr(line,' ')) != NULL)
1817                         *next++ = 0;
1818                 if (!ide_setup(line))
1819                         printk (KERN_INFO "Unknown option '%s'\n", line);
1820         }
1821 }
1822
1823 int __init init_module (void)
1824 {
1825         parse_options(options);
1826         return ide_init();
1827 }
1828
1829 void __exit cleanup_module (void)
1830 {
1831         int index;
1832
1833         for (index = 0; index < MAX_HWIFS; ++index)
1834                 ide_unregister(index);
1835
1836 #ifdef CONFIG_BLK_DEV_IDEPNP
1837         pnpide_exit();
1838 #endif
1839
1840         proc_ide_destroy();
1841
1842         bus_unregister(&ide_bus_type);
1843 }
1844
1845 #else /* !MODULE */
1846
1847 __setup("", ide_setup);
1848
1849 module_init(ide_init);
1850
1851 #endif /* MODULE */