drivers/ide/ide.c

   1 /*
   2  *  linux/drivers/ide/ide.c             Version 7.00beta2       Mar 05 2003
   3  *
   4  *  Copyright (C) 1994-1998  Linus Torvalds & authors (see below)
   5  */
   6
   7 /*
   8  *  Mostly written by Mark Lord  <mlord@pobox.com>
   9  *                and Gadi Oxman <gadio@netvision.net.il>
  10  *                and Andre Hedrick <andre@linux-ide.org>
  11  *
  12  *  See linux/MAINTAINERS for address of current maintainer.
  13  *
  14  * This is the multiple IDE interface driver, as evolved from hd.c.
  15  * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
  16  *   (usually 14 & 15).
  17  * There can be up to two drives per interface, as per the ATA-2 spec.
  18  *
  19  * ...
  20  *
  21  *  From hd.c:
  22  *  |
  23  *  | It traverses the request-list, using interrupts to jump between functions.
  24  *  | As nearly all functions can be called within interrupts, we may not sleep.
  25  *  | Special care is recommended.  Have Fun!
  26  *  |
  27  *  | modified by Drew Eckhardt to check nr of hd's from the CMOS.
  28  *  |
  29  *  | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
  30  *  | in the early extended-partition checks and added DM partitions.
  31  *  |
  32  *  | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
  33  *  |
  34  *  | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
  35  *  | and general streamlining by Mark Lord (mlord@pobox.com).
  36  *
  37  *  October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
  38  *
  39  *      Mark Lord       (mlord@pobox.com)               (IDE Perf.Pkg)
  40  *      Delman Lee      (delman@ieee.org)               ("Mr. atdisk2")
  41  *      Scott Snyder    (snyder@fnald0.fnal.gov)        (ATAPI IDE cd-rom)
  42  *
  43  *  This was a rewrite of just about everything from hd.c, though some original
  44  *  code is still sprinkled about.  Think of it as a major evolution, with
  45  *  inspiration from lots of linux users, esp.  hamish@zot.apana.org.au
  46  */
  47
  48 #define REVISION        "Revision: 7.00alpha2"
  49 #define VERSION         "Id: ide.c 7.00a2 20020906"
  50
  51 #define _IDE_C                  /* Tell ide.h it's really us */
  52
  53 #include <linux/module.h>
  54 #include <linux/types.h>
  55 #include <linux/string.h>
  56 #include <linux/kernel.h>
  57 #include <linux/timer.h>
  58 #include <linux/mm.h>
  59 #include <linux/interrupt.h>
  60 #include <linux/major.h>
  61 #include <linux/errno.h>
  62 #include <linux/genhd.h>
  63 #include <linux/blkpg.h>
  64 #include <linux/slab.h>
  65 #include <linux/init.h>
  66 #include <linux/pci.h>
  67 #include <linux/delay.h>
  68 #include <linux/ide.h>
  69 #include <linux/completion.h>
  70 #include <linux/reboot.h>
  71 #include <linux/cdrom.h>
  72 #include <linux/seq_file.h>
  73 #include <linux/device.h>
  74 #include <linux/bitops.h>
  75
  76 #include <asm/byteorder.h>
  77 #include <asm/irq.h>
  78 #include <asm/uaccess.h>
  79 #include <asm/io.h>
  80
  81
  82 /* default maximum number of failures */
  83 #define IDE_DEFAULT_MAX_FAILURES        1
  84
  85 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
  86                                         IDE2_MAJOR, IDE3_MAJOR,
  87                                         IDE4_MAJOR, IDE5_MAJOR,
  88                                         IDE6_MAJOR, IDE7_MAJOR,
  89                                         IDE8_MAJOR, IDE9_MAJOR };
  90
  91 static int idebus_parameter;    /* holds the "idebus=" parameter */
  92 static int system_bus_speed;    /* holds what we think is VESA/PCI bus speed */
  93
  94 DEFINE_MUTEX(ide_cfg_mtx);
  95  __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
  96
  97 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
  98 static int ide_scan_direction; /* THIS was formerly 2.2.x pci=reverse */
  99 #endif
 100
 101 int noautodma = 0;
 102
 103 #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 static void init_hwif_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
 163 static void init_hwif_default(ide_hwif_t *hwif, unsigned int index)
 164 {
 165         hw_regs_t hw;
 166
 167         memset(&hw, 0, sizeof(hw_regs_t));
 168
 169         ide_init_hwif_ports(&hw, ide_default_io_base(index), 0, &hwif->irq);
 170
 171         memcpy(&hwif->hw, &hw, sizeof(hw));
 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                 init_hwif_data(hwif, index);
 215                 init_hwif_default(hwif, index);
 216 #if !defined(CONFIG_PPC32) || !defined(CONFIG_PCI)
 217                 hwif->irq = hwif->hw.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 static struct resource* hwif_request_region(ide_hwif_t *hwif,
 269                                             unsigned long addr, int num)
 270 {
 271         struct resource *res = request_region(addr, num, hwif->name);
 272
 273         if (!res)
 274                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
 275                                 hwif->name, addr, addr+num-1);
 276         return res;
 277 }
 278
 279 /**
 280  *      ide_hwif_request_regions - request resources for IDE
 281  *      @hwif: interface to use
 282  *
 283  *      Requests all the needed resources for an interface.
 284  *      Right now core IDE code does this work which is deeply wrong.
 285  *      MMIO leaves it to the controller driver,
 286  *      PIO will migrate this way over time.
 287  */
 288
 289 int ide_hwif_request_regions(ide_hwif_t *hwif)
 290 {
 291         unsigned long addr;
 292         unsigned int i;
 293
 294         if (hwif->mmio)
 295                 return 0;
 296         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 297         if (addr && !hwif_request_region(hwif, addr, 1))
 298                 goto control_region_busy;
 299         hwif->straight8 = 0;
 300         addr = hwif->io_ports[IDE_DATA_OFFSET];
 301         if ((addr | 7) == hwif->io_ports[IDE_STATUS_OFFSET]) {
 302                 if (!hwif_request_region(hwif, addr, 8))
 303                         goto data_region_busy;
 304                 hwif->straight8 = 1;
 305                 return 0;
 306         }
 307         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
 308                 addr = hwif->io_ports[i];
 309                 if (!hwif_request_region(hwif, addr, 1)) {
 310                         while (--i)
 311                                 release_region(addr, 1);
 312                         goto data_region_busy;
 313                 }
 314         }
 315         return 0;
 316
 317 data_region_busy:
 318         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 319         if (addr)
 320                 release_region(addr, 1);
 321 control_region_busy:
 322         /* If any errors are return, we drop the hwif interface. */
 323         return -EBUSY;
 324 }
 325
 326 /**
 327  *      ide_hwif_release_regions - free IDE resources
 328  *
 329  *      Note that we only release the standard ports,
 330  *      and do not even try to handle any extra ports
 331  *      allocated for weird IDE interface chipsets.
 332  *
 333  *      Note also that we don't yet handle mmio resources here. More
 334  *      importantly our caller should be doing this so we need to
 335  *      restructure this as a helper function for drivers.
 336  */
 337
 338 void ide_hwif_release_regions(ide_hwif_t *hwif)
 339 {
 340         u32 i = 0;
 341
 342         if (hwif->mmio)
 343                 return;
 344         if (hwif->io_ports[IDE_CONTROL_OFFSET])
 345                 release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
 346         if (hwif->straight8) {
 347                 release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
 348                 return;
 349         }
 350         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
 351                 if (hwif->io_ports[i])
 352                         release_region(hwif->io_ports[i], 1);
 353 }
 354
 355 /**
 356  *      ide_hwif_restore        -       restore hwif to template
 357  *      @hwif: hwif to update
 358  *      @tmp_hwif: template
 359  *
 360  *      Restore hwif to a previous state by copying most settings
 361  *      from the template.
 362  */
 363
 364 static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
 365 {
 366         hwif->hwgroup                   = tmp_hwif->hwgroup;
 367
 368         hwif->gendev.parent             = tmp_hwif->gendev.parent;
 369
 370         hwif->proc                      = tmp_hwif->proc;
 371
 372         hwif->major                     = tmp_hwif->major;
 373         hwif->straight8                 = tmp_hwif->straight8;
 374         hwif->bus_state                 = tmp_hwif->bus_state;
 375
 376         hwif->host_flags                = tmp_hwif->host_flags;
 377
 378         hwif->pio_mask                  = tmp_hwif->pio_mask;
 379
 380         hwif->ultra_mask                = tmp_hwif->ultra_mask;
 381         hwif->mwdma_mask                = tmp_hwif->mwdma_mask;
 382         hwif->swdma_mask                = tmp_hwif->swdma_mask;
 383
 384         hwif->cbl                       = tmp_hwif->cbl;
 385
 386         hwif->chipset                   = tmp_hwif->chipset;
 387         hwif->hold                      = tmp_hwif->hold;
 388
 389 #ifdef CONFIG_BLK_DEV_IDEPCI
 390         hwif->pci_dev                   = tmp_hwif->pci_dev;
 391         hwif->cds                       = tmp_hwif->cds;
 392 #endif
 393
 394         hwif->fixup                     = tmp_hwif->fixup;
 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->intrproc                  = tmp_hwif->intrproc;
 405         hwif->maskproc                  = tmp_hwif->maskproc;
 406         hwif->quirkproc                 = tmp_hwif->quirkproc;
 407         hwif->busproc                   = tmp_hwif->busproc;
 408
 409         hwif->ata_input_data            = tmp_hwif->ata_input_data;
 410         hwif->ata_output_data           = tmp_hwif->ata_output_data;
 411         hwif->atapi_input_bytes         = tmp_hwif->atapi_input_bytes;
 412         hwif->atapi_output_bytes        = tmp_hwif->atapi_output_bytes;
 413
 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_on                = tmp_hwif->ide_dma_on;
 419         hwif->dma_off_quietly           = tmp_hwif->dma_off_quietly;
 420         hwif->ide_dma_test_irq          = tmp_hwif->ide_dma_test_irq;
 421         hwif->ide_dma_clear_irq         = tmp_hwif->ide_dma_clear_irq;
 422         hwif->dma_host_on               = tmp_hwif->dma_host_on;
 423         hwif->dma_host_off              = tmp_hwif->dma_host_off;
 424         hwif->dma_lost_irq              = tmp_hwif->dma_lost_irq;
 425         hwif->dma_timeout               = tmp_hwif->dma_timeout;
 426
 427         hwif->OUTB                      = tmp_hwif->OUTB;
 428         hwif->OUTBSYNC                  = tmp_hwif->OUTBSYNC;
 429         hwif->OUTW                      = tmp_hwif->OUTW;
 430         hwif->OUTSW                     = tmp_hwif->OUTSW;
 431         hwif->OUTSL                     = tmp_hwif->OUTSL;
 432
 433         hwif->INB                       = tmp_hwif->INB;
 434         hwif->INW                       = tmp_hwif->INW;
 435         hwif->INSW                      = tmp_hwif->INSW;
 436         hwif->INSL                      = tmp_hwif->INSL;
 437
 438         hwif->sg_max_nents              = tmp_hwif->sg_max_nents;
 439
 440         hwif->mmio                      = tmp_hwif->mmio;
 441         hwif->rqsize                    = tmp_hwif->rqsize;
 442
 443 #ifndef CONFIG_BLK_DEV_IDECS
 444         hwif->irq                       = tmp_hwif->irq;
 445 #endif
 446
 447         hwif->dma_base                  = tmp_hwif->dma_base;
 448         hwif->dma_master                = tmp_hwif->dma_master;
 449         hwif->dma_command               = tmp_hwif->dma_command;
 450         hwif->dma_vendor1               = tmp_hwif->dma_vendor1;
 451         hwif->dma_status                = tmp_hwif->dma_status;
 452         hwif->dma_vendor3               = tmp_hwif->dma_vendor3;
 453         hwif->dma_prdtable              = tmp_hwif->dma_prdtable;
 454
 455         hwif->config_data               = tmp_hwif->config_data;
 456         hwif->select_data               = tmp_hwif->select_data;
 457         hwif->extra_base                = tmp_hwif->extra_base;
 458         hwif->extra_ports               = tmp_hwif->extra_ports;
 459
 460         hwif->hwif_data                 = tmp_hwif->hwif_data;
 461 }
 462
 463 /**
 464  *      ide_unregister          -       free an IDE interface
 465  *      @index: index of interface (will change soon to a pointer)
 466  *
 467  *      Perform the final unregister of an IDE interface. At the moment
 468  *      we don't refcount interfaces so this will also get split up.
 469  *
 470  *      Locking:
 471  *      The caller must not hold the IDE locks
 472  *      The drive present/vanishing is not yet properly locked
 473  *      Take care with the callbacks. These have been split to avoid
 474  *      deadlocking the IDE layer. The shutdown callback is called
 475  *      before we take the lock and free resources. It is up to the
 476  *      caller to be sure there is no pending I/O here, and that
 477  *      the interface will not be reopened (present/vanishing locking
 478  *      isn't yet done BTW). After we commit to the final kill we
 479  *      call the cleanup callback with the ide locks held.
 480  *
 481  *      Unregister restores the hwif structures to the default state.
 482  *      This is raving bonkers.
 483  */
 484
 485 void ide_unregister(unsigned int index)
 486 {
 487         ide_drive_t *drive;
 488         ide_hwif_t *hwif, *g;
 489         static ide_hwif_t tmp_hwif; /* protected by ide_cfg_mtx */
 490         ide_hwgroup_t *hwgroup;
 491         int irq_count = 0, unit;
 492
 493         BUG_ON(index >= MAX_HWIFS);
 494
 495         BUG_ON(in_interrupt());
 496         BUG_ON(irqs_disabled());
 497         mutex_lock(&ide_cfg_mtx);
 498         spin_lock_irq(&ide_lock);
 499         hwif = &ide_hwifs[index];
 500         if (!hwif->present)
 501                 goto abort;
 502         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 503                 drive = &hwif->drives[unit];
 504                 if (!drive->present)
 505                         continue;
 506                 spin_unlock_irq(&ide_lock);
 507                 device_unregister(&drive->gendev);
 508                 wait_for_completion(&drive->gendev_rel_comp);
 509                 spin_lock_irq(&ide_lock);
 510         }
 511         hwif->present = 0;
 512
 513         spin_unlock_irq(&ide_lock);
 514
 515         ide_proc_unregister_port(hwif);
 516
 517         hwgroup = hwif->hwgroup;
 518         /*
 519          * free the irq if we were the only hwif using it
 520          */
 521         g = hwgroup->hwif;
 522         do {
 523                 if (g->irq == hwif->irq)
 524                         ++irq_count;
 525                 g = g->next;
 526         } while (g != hwgroup->hwif);
 527         if (irq_count == 1)
 528                 free_irq(hwif->irq, hwgroup);
 529
 530         spin_lock_irq(&ide_lock);
 531         /*
 532          * Note that we only release the standard ports,
 533          * and do not even try to handle any extra ports
 534          * allocated for weird IDE interface chipsets.
 535          */
 536         ide_hwif_release_regions(hwif);
 537
 538         /*
 539          * Remove us from the hwgroup, and free
 540          * the hwgroup if we were the only member
 541          */
 542         if (hwif->next == hwif) {
 543                 BUG_ON(hwgroup->hwif != hwif);
 544                 kfree(hwgroup);
 545         } else {
 546                 /* There is another interface in hwgroup.
 547                  * Unlink us, and set hwgroup->drive and ->hwif to
 548                  * something sane.
 549                  */
 550                 g = hwgroup->hwif;
 551                 while (g->next != hwif)
 552                         g = g->next;
 553                 g->next = hwif->next;
 554                 if (hwgroup->hwif == hwif) {
 555                         /* Chose a random hwif for hwgroup->hwif.
 556                          * It's guaranteed that there are no drives
 557                          * left in the hwgroup.
 558                          */
 559                         BUG_ON(hwgroup->drive != NULL);
 560                         hwgroup->hwif = g;
 561                 }
 562                 BUG_ON(hwgroup->hwif == hwif);
 563         }
 564
 565         /* More messed up locking ... */
 566         spin_unlock_irq(&ide_lock);
 567         device_unregister(&hwif->gendev);
 568         wait_for_completion(&hwif->gendev_rel_comp);
 569
 570         /*
 571          * Remove us from the kernel's knowledge
 572          */
 573         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 574         kfree(hwif->sg_table);
 575         unregister_blkdev(hwif->major, hwif->name);
 576         spin_lock_irq(&ide_lock);
 577
 578         if (hwif->dma_base) {
 579                 (void) ide_release_dma(hwif);
 580
 581                 hwif->dma_base = 0;
 582                 hwif->dma_master = 0;
 583                 hwif->dma_command = 0;
 584                 hwif->dma_vendor1 = 0;
 585                 hwif->dma_status = 0;
 586                 hwif->dma_vendor3 = 0;
 587                 hwif->dma_prdtable = 0;
 588
 589                 hwif->extra_base  = 0;
 590                 hwif->extra_ports = 0;
 591         }
 592
 593         /* copy original settings */
 594         tmp_hwif = *hwif;
 595
 596         /* restore hwif data to pristine status */
 597         init_hwif_data(hwif, index);
 598         init_hwif_default(hwif, index);
 599
 600         ide_hwif_restore(hwif, &tmp_hwif);
 601
 602 abort:
 603         spin_unlock_irq(&ide_lock);
 604         mutex_unlock(&ide_cfg_mtx);
 605 }
 606
 607 EXPORT_SYMBOL(ide_unregister);
 608
 609
 610 /**
 611  *      ide_setup_ports         -       set up IDE interface ports
 612  *      @hw: register descriptions
 613  *      @base: base register
 614  *      @offsets: table of register offsets
 615  *      @ctrl: control register
 616  *      @ack_irq: IRQ ack
 617  *      @irq: interrupt lie
 618  *
 619  *      Setup hw_regs_t structure described by parameters.  You
 620  *      may set up the hw structure yourself OR use this routine to
 621  *      do it for you. This is basically a helper
 622  *
 623  */
 624
 625 void ide_setup_ports (  hw_regs_t *hw,
 626                         unsigned long base, int *offsets,
 627                         unsigned long ctrl, unsigned long intr,
 628                         ide_ack_intr_t *ack_intr,
 629 /*
 630  *                      ide_io_ops_t *iops,
 631  */
 632                         int irq)
 633 {
 634         int i;
 635
 636         memset(hw, 0, sizeof(hw_regs_t));
 637         for (i = 0; i < IDE_NR_PORTS; i++) {
 638                 if (offsets[i] == -1) {
 639                         switch(i) {
 640                                 case IDE_CONTROL_OFFSET:
 641                                         hw->io_ports[i] = ctrl;
 642                                         break;
 643 #if defined(CONFIG_AMIGA) || defined(CONFIG_MAC)
 644                                 case IDE_IRQ_OFFSET:
 645                                         hw->io_ports[i] = intr;
 646                                         break;
 647 #endif /* (CONFIG_AMIGA) || (CONFIG_MAC) */
 648                                 default:
 649                                         hw->io_ports[i] = 0;
 650                                         break;
 651                         }
 652                 } else {
 653                         hw->io_ports[i] = base + offsets[i];
 654                 }
 655         }
 656         hw->irq = irq;
 657         hw->dma = NO_DMA;
 658         hw->ack_intr = ack_intr;
 659 /*
 660  *      hw->iops = iops;
 661  */
 662 }
 663
 664 /**
 665  *      ide_register_hw         -       register IDE interface
 666  *      @hw: hardware registers
 667  *      @fixup: fixup function
 668  *      @initializing: set while initializing built-in drivers
 669  *      @hwifp: pointer to returned hwif
 670  *
 671  *      Register an IDE interface, specifying exactly the registers etc.
 672  *      Set init=1 iff calling before probes have taken place.
 673  *
 674  *      Returns -1 on error.
 675  */
 676
 677 int ide_register_hw(hw_regs_t *hw, void (*fixup)(ide_hwif_t *),
 678                     int initializing, ide_hwif_t **hwifp)
 679 {
 680         int index, retry = 1;
 681         ide_hwif_t *hwif;
 682
 683         do {
 684                 for (index = 0; index < MAX_HWIFS; ++index) {
 685                         hwif = &ide_hwifs[index];
 686                         if (hwif->hw.io_ports[IDE_DATA_OFFSET] == hw->io_ports[IDE_DATA_OFFSET])
 687                                 goto found;
 688                 }
 689                 for (index = 0; index < MAX_HWIFS; ++index) {
 690                         hwif = &ide_hwifs[index];
 691                         if (hwif->hold)
 692                                 continue;
 693                         if ((!hwif->present && !hwif->mate && !initializing) ||
 694                             (!hwif->hw.io_ports[IDE_DATA_OFFSET] && initializing))
 695                                 goto found;
 696                 }
 697                 for (index = 0; index < MAX_HWIFS; index++)
 698                         ide_unregister(index);
 699         } while (retry--);
 700         return -1;
 701 found:
 702         if (hwif->present)
 703                 ide_unregister(index);
 704         else if (!hwif->hold) {
 705                 init_hwif_data(hwif, index);
 706                 init_hwif_default(hwif, index);
 707         }
 708         if (hwif->present)
 709                 return -1;
 710         memcpy(&hwif->hw, hw, sizeof(*hw));
 711         memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->hw.io_ports));
 712         hwif->irq = hw->irq;
 713         hwif->noprobe = 0;
 714         hwif->fixup = fixup;
 715         hwif->chipset = hw->chipset;
 716         hwif->gendev.parent = hw->dev;
 717
 718         if (initializing == 0) {
 719                 u8 idx[4] = { index, 0xff, 0xff, 0xff };
 720
 721                 ide_device_add(idx);
 722         }
 723
 724         if (hwifp)
 725                 *hwifp = hwif;
 726
 727         return (initializing || hwif->present) ? index : -1;
 728 }
 729
 730 EXPORT_SYMBOL(ide_register_hw);
 731
 732 /*
 733  *      Locks for IDE setting functionality
 734  */
 735
 736 DEFINE_MUTEX(ide_setting_mtx);
 737
 738 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 739
 740 /**
 741  *      ide_spin_wait_hwgroup   -       wait for group
 742  *      @drive: drive in the group
 743  *
 744  *      Wait for an IDE device group to go non busy and then return
 745  *      holding the ide_lock which guards the hwgroup->busy status
 746  *      and right to use it.
 747  */
 748
 749 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 750 {
 751         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 752         unsigned long timeout = jiffies + (3 * HZ);
 753
 754         spin_lock_irq(&ide_lock);
 755
 756         while (hwgroup->busy) {
 757                 unsigned long lflags;
 758                 spin_unlock_irq(&ide_lock);
 759                 local_irq_set(lflags);
 760                 if (time_after(jiffies, timeout)) {
 761                         local_irq_restore(lflags);
 762                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 763                         return -EBUSY;
 764                 }
 765                 local_irq_restore(lflags);
 766                 spin_lock_irq(&ide_lock);
 767         }
 768         return 0;
 769 }
 770
 771 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 772
 773 int set_io_32bit(ide_drive_t *drive, int arg)
 774 {
 775         if (drive->no_io_32bit)
 776                 return -EPERM;
 777
 778         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 779                 return -EINVAL;
 780
 781         drive->io_32bit = arg;
 782 #ifdef CONFIG_BLK_DEV_DTC2278
 783         if (HWIF(drive)->chipset == ide_dtc2278)
 784                 HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
 785 #endif /* CONFIG_BLK_DEV_DTC2278 */
 786         return 0;
 787 }
 788
 789 static int set_ksettings(ide_drive_t *drive, int arg)
 790 {
 791         if (arg < 0 || arg > 1)
 792                 return -EINVAL;
 793
 794         if (ide_spin_wait_hwgroup(drive))
 795                 return -EBUSY;
 796         drive->keep_settings = arg;
 797         spin_unlock_irq(&ide_lock);
 798
 799         return 0;
 800 }
 801
 802 int set_using_dma(ide_drive_t *drive, int arg)
 803 {
 804 #ifdef CONFIG_BLK_DEV_IDEDMA
 805         ide_hwif_t *hwif = drive->hwif;
 806         int err = -EPERM;
 807
 808         if (arg < 0 || arg > 1)
 809                 return -EINVAL;
 810
 811         if (!drive->id || !(drive->id->capability & 1))
 812                 goto out;
 813
 814         if (hwif->ide_dma_on == NULL)
 815                 goto out;
 816
 817         err = -EBUSY;
 818         if (ide_spin_wait_hwgroup(drive))
 819                 goto out;
 820         /*
 821          * set ->busy flag, unlock and let it ride
 822          */
 823         hwif->hwgroup->busy = 1;
 824         spin_unlock_irq(&ide_lock);
 825
 826         err = 0;
 827
 828         if (arg) {
 829                 hwif->dma_off_quietly(drive);
 830                 if (ide_set_dma(drive) || hwif->ide_dma_on(drive))
 831                         err = -EIO;
 832         } else
 833                 ide_dma_off(drive);
 834
 835         /*
 836          * lock, clear ->busy flag and unlock before leaving
 837          */
 838         spin_lock_irq(&ide_lock);
 839         hwif->hwgroup->busy = 0;
 840         spin_unlock_irq(&ide_lock);
 841 out:
 842         return err;
 843 #else
 844         if (arg < 0 || arg > 1)
 845                 return -EINVAL;
 846
 847         return -EPERM;
 848 #endif
 849 }
 850
 851 int set_pio_mode(ide_drive_t *drive, int arg)
 852 {
 853         struct request rq;
 854
 855         if (arg < 0 || arg > 255)
 856                 return -EINVAL;
 857
 858         if (drive->hwif->set_pio_mode == NULL)
 859                 return -ENOSYS;
 860
 861         if (drive->special.b.set_tune)
 862                 return -EBUSY;
 863         ide_init_drive_cmd(&rq);
 864         drive->tune_req = (u8) arg;
 865         drive->special.b.set_tune = 1;
 866         (void) ide_do_drive_cmd(drive, &rq, ide_wait);
 867         return 0;
 868 }
 869
 870 static int set_unmaskirq(ide_drive_t *drive, int arg)
 871 {
 872         if (drive->no_unmask)
 873                 return -EPERM;
 874
 875         if (arg < 0 || arg > 1)
 876                 return -EINVAL;
 877
 878         if (ide_spin_wait_hwgroup(drive))
 879                 return -EBUSY;
 880         drive->unmask = arg;
 881         spin_unlock_irq(&ide_lock);
 882
 883         return 0;
 884 }
 885
 886 /**
 887  *      system_bus_clock        -       clock guess
 888  *
 889  *      External version of the bus clock guess used by very old IDE drivers
 890  *      for things like VLB timings. Should not be used.
 891  */
 892
 893 int system_bus_clock (void)
 894 {
 895         return((int) ((!system_bus_speed) ? ide_system_bus_speed() : system_bus_speed ));
 896 }
 897
 898 EXPORT_SYMBOL(system_bus_clock);
 899
 900 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 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 ret;
 908
 909         /* Call ACPI _GTM only once */
 910         if (!(drive->dn % 2))
 911                 ide_acpi_get_timing(hwif);
 912
 913         memset(&rq, 0, sizeof(rq));
 914         memset(&rqpm, 0, sizeof(rqpm));
 915         memset(&args, 0, sizeof(args));
 916         rq.cmd_type = REQ_TYPE_PM_SUSPEND;
 917         rq.special = &args;
 918         rq.data = &rqpm;
 919         rqpm.pm_step = ide_pm_state_start_suspend;
 920         if (mesg.event == PM_EVENT_PRETHAW)
 921                 mesg.event = PM_EVENT_FREEZE;
 922         rqpm.pm_state = mesg.event;
 923
 924         ret = ide_do_drive_cmd(drive, &rq, ide_wait);
 925         /* only call ACPI _PS3 after both drivers are suspended */
 926         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 927                  && hwif->drives[1].present)
 928                  || !hwif->drives[0].present
 929                  || !hwif->drives[1].present))
 930                 ide_acpi_set_state(hwif, 0);
 931         return ret;
 932 }
 933
 934 static int generic_ide_resume(struct device *dev)
 935 {
 936         ide_drive_t *drive = dev->driver_data;
 937         ide_hwif_t *hwif = HWIF(drive);
 938         struct request rq;
 939         struct request_pm_state rqpm;
 940         ide_task_t args;
 941         int err;
 942
 943         /* Call ACPI _STM only once */
 944         if (!(drive->dn % 2)) {
 945                 ide_acpi_set_state(hwif, 1);
 946                 ide_acpi_push_timing(hwif);
 947         }
 948
 949         ide_acpi_exec_tfs(drive);
 950
 951         memset(&rq, 0, sizeof(rq));
 952         memset(&rqpm, 0, sizeof(rqpm));
 953         memset(&args, 0, sizeof(args));
 954         rq.cmd_type = REQ_TYPE_PM_RESUME;
 955         rq.special = &args;
 956         rq.data = &rqpm;
 957         rqpm.pm_step = ide_pm_state_start_resume;
 958         rqpm.pm_state = PM_EVENT_ON;
 959
 960         err = ide_do_drive_cmd(drive, &rq, ide_head_wait);
 961
 962         if (err == 0 && dev->driver) {
 963                 ide_driver_t *drv = to_ide_driver(dev->driver);
 964
 965                 if (drv->resume)
 966                         drv->resume(drive);
 967         }
 968
 969         return err;
 970 }
 971
 972 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 973                         unsigned int cmd, unsigned long arg)
 974 {
 975         unsigned long flags;
 976         ide_driver_t *drv;
 977         void __user *p = (void __user *)arg;
 978         int err = 0, (*setfunc)(ide_drive_t *, int);
 979         u8 *val;
 980
 981         switch (cmd) {
 982         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
 983         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
 984         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
 985         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
 986         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
 987         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
 988         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
 989         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
 990         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
 991         }
 992
 993         switch (cmd) {
 994                 case HDIO_OBSOLETE_IDENTITY:
 995                 case HDIO_GET_IDENTITY:
 996                         if (bdev != bdev->bd_contains)
 997                                 return -EINVAL;
 998                         if (drive->id_read == 0)
 999                                 return -ENOMSG;
1000                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
1001                                 return -EFAULT;
1002                         return 0;
1003
1004                 case HDIO_GET_NICE:
1005                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
1006                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
1007                                         drive->nice0            <<      IDE_NICE_0              |
1008                                         drive->nice1            <<      IDE_NICE_1              |
1009                                         drive->nice2            <<      IDE_NICE_2,
1010                                         (long __user *) arg);
1011
1012 #ifdef CONFIG_IDE_TASK_IOCTL
1013                 case HDIO_DRIVE_TASKFILE:
1014                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1015                                 return -EACCES;
1016                         switch(drive->media) {
1017                                 case ide_disk:
1018                                         return ide_taskfile_ioctl(drive, cmd, arg);
1019                                 default:
1020                                         return -ENOMSG;
1021                         }
1022 #endif /* CONFIG_IDE_TASK_IOCTL */
1023
1024                 case HDIO_DRIVE_CMD:
1025                         if (!capable(CAP_SYS_RAWIO))
1026                                 return -EACCES;
1027                         return ide_cmd_ioctl(drive, cmd, arg);
1028
1029                 case HDIO_DRIVE_TASK:
1030                         if (!capable(CAP_SYS_RAWIO))
1031                                 return -EACCES;
1032                         return ide_task_ioctl(drive, cmd, arg);
1033
1034                 case HDIO_SCAN_HWIF:
1035                 {
1036                         hw_regs_t hw;
1037                         int args[3];
1038                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1039                         if (copy_from_user(args, p, 3 * sizeof(int)))
1040                                 return -EFAULT;
1041                         memset(&hw, 0, sizeof(hw));
1042                         ide_init_hwif_ports(&hw, (unsigned long) args[0],
1043                                             (unsigned long) args[1], NULL);
1044                         hw.irq = args[2];
1045                         if (ide_register_hw(&hw, NULL, 0, NULL) == -1)
1046                                 return -EIO;
1047                         return 0;
1048                 }
1049                 case HDIO_UNREGISTER_HWIF:
1050                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1051                         /* (arg > MAX_HWIFS) checked in function */
1052                         ide_unregister(arg);
1053                         return 0;
1054                 case HDIO_SET_NICE:
1055                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1056                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
1057                                 return -EPERM;
1058                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
1059                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
1060                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
1061                                 drive->dsc_overlap = 0;
1062                                 return -EPERM;
1063                         }
1064                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
1065                         return 0;
1066                 case HDIO_DRIVE_RESET:
1067                 {
1068                         unsigned long flags;
1069                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1070
1071                         /*
1072                          *      Abort the current command on the
1073                          *      group if there is one, taking
1074                          *      care not to allow anything else
1075                          *      to be queued and to die on the
1076                          *      spot if we miss one somehow
1077                          */
1078
1079                         spin_lock_irqsave(&ide_lock, flags);
1080
1081                         if (HWGROUP(drive)->resetting) {
1082                                 spin_unlock_irqrestore(&ide_lock, flags);
1083                                 return -EBUSY;
1084                         }
1085
1086                         ide_abort(drive, "drive reset");
1087
1088                         BUG_ON(HWGROUP(drive)->handler);
1089
1090                         /* Ensure nothing gets queued after we
1091                            drop the lock. Reset will clear the busy */
1092
1093                         HWGROUP(drive)->busy = 1;
1094                         spin_unlock_irqrestore(&ide_lock, flags);
1095                         (void) ide_do_reset(drive);
1096
1097                         return 0;
1098                 }
1099
1100                 case HDIO_GET_BUSSTATE:
1101                         if (!capable(CAP_SYS_ADMIN))
1102                                 return -EACCES;
1103                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
1104                                 return -EFAULT;
1105                         return 0;
1106
1107                 case HDIO_SET_BUSSTATE:
1108                         if (!capable(CAP_SYS_ADMIN))
1109                                 return -EACCES;
1110                         if (HWIF(drive)->busproc)
1111                                 return HWIF(drive)->busproc(drive, (int)arg);
1112                         return -EOPNOTSUPP;
1113                 default:
1114                         return -EINVAL;
1115         }
1116
1117 read_val:
1118         mutex_lock(&ide_setting_mtx);
1119         spin_lock_irqsave(&ide_lock, flags);
1120         err = *val;
1121         spin_unlock_irqrestore(&ide_lock, flags);
1122         mutex_unlock(&ide_setting_mtx);
1123         return err >= 0 ? put_user(err, (long __user *)arg) : err;
1124
1125 set_val:
1126         if (bdev != bdev->bd_contains)
1127                 err = -EINVAL;
1128         else {
1129                 if (!capable(CAP_SYS_ADMIN))
1130                         err = -EACCES;
1131                 else {
1132                         mutex_lock(&ide_setting_mtx);
1133                         err = setfunc(drive, arg);
1134                         mutex_unlock(&ide_setting_mtx);
1135                 }
1136         }
1137         return err;
1138 }
1139
1140 EXPORT_SYMBOL(generic_ide_ioctl);
1141
1142 /*
1143  * stridx() returns the offset of c within s,
1144  * or -1 if c is '\0' or not found within s.
1145  */
1146 static int __init stridx (const char *s, char c)
1147 {
1148         char *i = strchr(s, c);
1149         return (i && c) ? i - s : -1;
1150 }
1151
1152 /*
1153  * match_parm() does parsing for ide_setup():
1154  *
1155  * 1. the first char of s must be '='.
1156  * 2. if the remainder matches one of the supplied keywords,
1157  *     the index (1 based) of the keyword is negated and returned.
1158  * 3. if the remainder is a series of no more than max_vals numbers
1159  *     separated by commas, the numbers are saved in vals[] and a
1160  *     count of how many were saved is returned.  Base10 is assumed,
1161  *     and base16 is allowed when prefixed with "0x".
1162  * 4. otherwise, zero is returned.
1163  */
1164 static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
1165 {
1166         static const char *decimal = "0123456789";
1167         static const char *hex = "0123456789abcdef";
1168         int i, n;
1169
1170         if (*s++ == '=') {
1171                 /*
1172                  * Try matching against the supplied keywords,
1173                  * and return -(index+1) if we match one
1174                  */
1175                 if (keywords != NULL) {
1176                         for (i = 0; *keywords != NULL; ++i) {
1177                                 if (!strcmp(s, *keywords++))
1178                                         return -(i+1);
1179                         }
1180                 }
1181                 /*
1182                  * Look for a series of no more than "max_vals"
1183                  * numeric values separated by commas, in base10,
1184                  * or base16 when prefixed with "0x".
1185                  * Return a count of how many were found.
1186                  */
1187                 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
1188                         vals[n] = i;
1189                         while ((i = stridx(decimal, *++s)) >= 0)
1190                                 vals[n] = (vals[n] * 10) + i;
1191                         if (*s == 'x' && !vals[n]) {
1192                                 while ((i = stridx(hex, *++s)) >= 0)
1193                                         vals[n] = (vals[n] * 0x10) + i;
1194                         }
1195                         if (++n == max_vals)
1196                                 break;
1197                         if (*s == ',' || *s == ';')
1198                                 ++s;
1199                 }
1200                 if (!*s)
1201                         return n;
1202         }
1203         return 0;       /* zero = nothing matched */
1204 }
1205
1206 #ifdef CONFIG_BLK_DEV_ALI14XX
1207 extern int probe_ali14xx;
1208 extern int ali14xx_init(void);
1209 #endif
1210 #ifdef CONFIG_BLK_DEV_UMC8672
1211 extern int probe_umc8672;
1212 extern int umc8672_init(void);
1213 #endif
1214 #ifdef CONFIG_BLK_DEV_DTC2278
1215 extern int probe_dtc2278;
1216 extern int dtc2278_init(void);
1217 #endif
1218 #ifdef CONFIG_BLK_DEV_HT6560B
1219 extern int probe_ht6560b;
1220 extern int ht6560b_init(void);
1221 #endif
1222 #ifdef CONFIG_BLK_DEV_QD65XX
1223 extern int probe_qd65xx;
1224 extern int qd65xx_init(void);
1225 #endif
1226
1227 static int __initdata is_chipset_set[MAX_HWIFS];
1228
1229 /*
1230  * ide_setup() gets called VERY EARLY during initialization,
1231  * to handle kernel "command line" strings beginning with "hdx=" or "ide".
1232  *
1233  * Remember to update Documentation/ide.txt if you change something here.
1234  */
1235 static int __init ide_setup(char *s)
1236 {
1237         int i, vals[3];
1238         ide_hwif_t *hwif;
1239         ide_drive_t *drive;
1240         unsigned int hw, unit;
1241         const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
1242         const char max_hwif  = '0' + (MAX_HWIFS - 1);
1243
1244
1245         if (strncmp(s,"hd",2) == 0 && s[2] == '=')      /* hd= is for hd.c   */
1246                 return 0;                               /* driver and not us */
1247
1248         if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
1249                 return 0;
1250
1251         printk(KERN_INFO "ide_setup: %s", s);
1252         init_ide_data ();
1253
1254 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
1255         if (!strcmp(s, "ide=doubler")) {
1256                 extern int ide_doubler;
1257
1258                 printk(" : Enabled support for IDE doublers\n");
1259                 ide_doubler = 1;
1260                 return 1;
1261         }
1262 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
1263
1264         if (!strcmp(s, "ide=nodma")) {
1265                 printk(" : Prevented DMA\n");
1266                 noautodma = 1;
1267                 goto obsolete_option;
1268         }
1269
1270 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
1271         if (!strcmp(s, "ide=reverse")) {
1272                 ide_scan_direction = 1;
1273                 printk(" : Enabled support for IDE inverse scan order.\n");
1274                 return 1;
1275         }
1276 #endif
1277
1278 #ifdef CONFIG_BLK_DEV_IDEACPI
1279         if (!strcmp(s, "ide=noacpi")) {
1280                 //printk(" : Disable IDE ACPI support.\n");
1281                 ide_noacpi = 1;
1282                 return 1;
1283         }
1284         if (!strcmp(s, "ide=acpigtf")) {
1285                 //printk(" : Enable IDE ACPI _GTF support.\n");
1286                 ide_noacpitfs = 0;
1287                 return 1;
1288         }
1289         if (!strcmp(s, "ide=acpionboot")) {
1290                 //printk(" : Call IDE ACPI methods on boot.\n");
1291                 ide_noacpionboot = 0;
1292                 return 1;
1293         }
1294 #endif /* CONFIG_BLK_DEV_IDEACPI */
1295
1296         /*
1297          * Look for drive options:  "hdx="
1298          */
1299         if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
1300                 const char *hd_words[] = {
1301                         "none", "noprobe", "nowerr", "cdrom", "nodma",
1302                         "autotune", "noautotune", "minus8", "swapdata", "bswap",
1303                         "noflush", "remap", "remap63", "scsi", NULL };
1304                 unit = s[2] - 'a';
1305                 hw   = unit / MAX_DRIVES;
1306                 unit = unit % MAX_DRIVES;
1307                 hwif = &ide_hwifs[hw];
1308                 drive = &hwif->drives[unit];
1309                 if (strncmp(s + 4, "ide-", 4) == 0) {
1310                         strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
1311                         goto done;
1312                 }
1313                 switch (match_parm(&s[3], hd_words, vals, 3)) {
1314                         case -1: /* "none" */
1315                         case -2: /* "noprobe" */
1316                                 drive->noprobe = 1;
1317                                 goto done;
1318                         case -3: /* "nowerr" */
1319                                 drive->bad_wstat = BAD_R_STAT;
1320                                 hwif->noprobe = 0;
1321                                 goto done;
1322                         case -4: /* "cdrom" */
1323                                 drive->present = 1;
1324                                 drive->media = ide_cdrom;
1325                                 /* an ATAPI device ignores DRDY */
1326                                 drive->ready_stat = 0;
1327                                 hwif->noprobe = 0;
1328                                 goto done;
1329                         case -5: /* nodma */
1330                                 drive->nodma = 1;
1331                                 goto done;
1332                         case -6: /* "autotune" */
1333                                 drive->autotune = IDE_TUNE_AUTO;
1334                                 goto obsolete_option;
1335                         case -7: /* "noautotune" */
1336                                 drive->autotune = IDE_TUNE_NOAUTO;
1337                                 goto obsolete_option;
1338                         case -9: /* "swapdata" */
1339                         case -10: /* "bswap" */
1340                                 drive->bswap = 1;
1341                                 goto done;
1342                         case -11: /* noflush */
1343                                 drive->noflush = 1;
1344                                 goto done;
1345                         case -12: /* "remap" */
1346                                 drive->remap_0_to_1 = 1;
1347                                 goto done;
1348                         case -13: /* "remap63" */
1349                                 drive->sect0 = 63;
1350                                 goto done;
1351                         case -14: /* "scsi" */
1352                                 drive->scsi = 1;
1353                                 goto done;
1354                         case 3: /* cyl,head,sect */
1355                                 drive->media    = ide_disk;
1356                                 drive->ready_stat = READY_STAT;
1357                                 drive->cyl      = drive->bios_cyl  = vals[0];
1358                                 drive->head     = drive->bios_head = vals[1];
1359                                 drive->sect     = drive->bios_sect = vals[2];
1360                                 drive->present  = 1;
1361                                 drive->forced_geom = 1;
1362                                 hwif->noprobe = 0;
1363                                 goto done;
1364                         default:
1365                                 goto bad_option;
1366                 }
1367         }
1368
1369         if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
1370                 goto bad_option;
1371         /*
1372          * Look for bus speed option:  "idebus="
1373          */
1374         if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
1375                 if (match_parm(&s[6], NULL, vals, 1) != 1)
1376                         goto bad_option;
1377                 if (vals[0] >= 20 && vals[0] <= 66) {
1378                         idebus_parameter = vals[0];
1379                 } else
1380                         printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
1381                 goto done;
1382         }
1383         /*
1384          * Look for interface options:  "idex="
1385          */
1386         if (s[3] >= '0' && s[3] <= max_hwif) {
1387                 /*
1388                  * Be VERY CAREFUL changing this: note hardcoded indexes below
1389                  * (-8, -9, -10) are reserved to ease the hardcoding.
1390                  */
1391                 static const char *ide_words[] = {
1392                         "noprobe", "serialize", "minus3", "minus4",
1393                         "reset", "minus6", "ata66", "minus8", "minus9",
1394                         "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
1395                         "dtc2278", "umc8672", "ali14xx", NULL };
1396                 hw = s[3] - '0';
1397                 hwif = &ide_hwifs[hw];
1398                 i = match_parm(&s[4], ide_words, vals, 3);
1399
1400                 /*
1401                  * Cryptic check to ensure chipset not already set for hwif.
1402                  * Note: we can't depend on hwif->chipset here.
1403                  */
1404                 if ((i >= -18 && i <= -11) || (i > 0 && i <= 3)) {
1405                         /* chipset already specified */
1406                         if (is_chipset_set[hw])
1407                                 goto bad_option;
1408                         if (i > -18 && i <= -11) {
1409                                 /* these drivers are for "ide0=" only */
1410                                 if (hw != 0)
1411                                         goto bad_hwif;
1412                                 /* chipset already specified for 2nd port */
1413                                 if (is_chipset_set[hw+1])
1414                                         goto bad_option;
1415                         }
1416                         is_chipset_set[hw] = 1;
1417                         printk("\n");
1418                 }
1419
1420                 switch (i) {
1421 #ifdef CONFIG_BLK_DEV_ALI14XX
1422                         case -17: /* "ali14xx" */
1423                                 probe_ali14xx = 1;
1424                                 goto done;
1425 #endif
1426 #ifdef CONFIG_BLK_DEV_UMC8672
1427                         case -16: /* "umc8672" */
1428                                 probe_umc8672 = 1;
1429                                 goto done;
1430 #endif
1431 #ifdef CONFIG_BLK_DEV_DTC2278
1432                         case -15: /* "dtc2278" */
1433                                 probe_dtc2278 = 1;
1434                                 goto done;
1435 #endif
1436 #ifdef CONFIG_BLK_DEV_CMD640
1437                         case -14: /* "cmd640_vlb" */
1438                         {
1439                                 extern int cmd640_vlb; /* flag for cmd640.c */
1440                                 cmd640_vlb = 1;
1441                                 goto done;
1442                         }
1443 #endif
1444 #ifdef CONFIG_BLK_DEV_HT6560B
1445                         case -13: /* "ht6560b" */
1446                                 probe_ht6560b = 1;
1447                                 goto done;
1448 #endif
1449 #ifdef CONFIG_BLK_DEV_QD65XX
1450                         case -12: /* "qd65xx" */
1451                                 probe_qd65xx = 1;
1452                                 goto done;
1453 #endif
1454 #ifdef CONFIG_BLK_DEV_4DRIVES
1455                         case -11: /* "four" drives on one set of ports */
1456                         {
1457                                 ide_hwif_t *mate = &ide_hwifs[hw^1];
1458                                 mate->drives[0].select.all ^= 0x20;
1459                                 mate->drives[1].select.all ^= 0x20;
1460                                 hwif->chipset = mate->chipset = ide_4drives;
1461                                 mate->irq = hwif->irq;
1462                                 memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
1463                                 hwif->mate = mate;
1464                                 mate->mate = hwif;
1465                                 hwif->serialized = mate->serialized = 1;
1466                                 goto obsolete_option;
1467                         }
1468 #endif /* CONFIG_BLK_DEV_4DRIVES */
1469                         case -10: /* minus10 */
1470                         case -9: /* minus9 */
1471                         case -8: /* minus8 */
1472                         case -6:
1473                         case -4:
1474                         case -3:
1475                                 goto bad_option;
1476                         case -7: /* ata66 */
1477 #ifdef CONFIG_BLK_DEV_IDEPCI
1478                                 /*
1479                                  * Use ATA_CBL_PATA40_SHORT so drive side
1480                                  * cable detection is also overriden.
1481                                  */
1482                                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1483                                 goto obsolete_option;
1484 #else
1485                                 goto bad_hwif;
1486 #endif
1487                         case -5: /* "reset" */
1488                                 hwif->reset = 1;
1489                                 goto obsolete_option;
1490                         case -2: /* "serialize" */
1491                                 hwif->mate = &ide_hwifs[hw^1];
1492                                 hwif->mate->mate = hwif;
1493                                 hwif->serialized = hwif->mate->serialized = 1;
1494                                 goto obsolete_option;
1495
1496                         case -1: /* "noprobe" */
1497                                 hwif->noprobe = 1;
1498                                 goto done;
1499
1500                         case 1: /* base */
1501                                 vals[1] = vals[0] + 0x206; /* default ctl */
1502                         case 2: /* base,ctl */
1503                                 vals[2] = 0;    /* default irq = probe for it */
1504                         case 3: /* base,ctl,irq */
1505                                 hwif->hw.irq = vals[2];
1506                                 ide_init_hwif_ports(&hwif->hw, (unsigned long) vals[0], (unsigned long) vals[1], &hwif->irq);
1507                                 memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->io_ports));
1508                                 hwif->irq      = vals[2];
1509                                 hwif->noprobe  = 0;
1510                                 hwif->chipset  = ide_forced;
1511                                 goto obsolete_option;
1512
1513                         case 0: goto bad_option;
1514                         default:
1515                                 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
1516                                 return 1;
1517                 }
1518         }
1519 bad_option:
1520         printk(" -- BAD OPTION\n");
1521         return 1;
1522 obsolete_option:
1523         printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
1524         return 1;
1525 bad_hwif:
1526         printk("-- NOT SUPPORTED ON ide%d", hw);
1527 done:
1528         printk("\n");
1529         return 1;
1530 }
1531
1532 extern void __init pnpide_init(void);
1533 extern void __exit pnpide_exit(void);
1534 extern void __init h8300_ide_init(void);
1535
1536 /*
1537  * probe_for_hwifs() finds/initializes "known" IDE interfaces
1538  */
1539 static void __init probe_for_hwifs (void)
1540 {
1541 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
1542         ide_scan_pcibus(ide_scan_direction);
1543 #endif
1544
1545 #ifdef CONFIG_ETRAX_IDE
1546         {
1547                 extern void init_e100_ide(void);
1548                 init_e100_ide();
1549         }
1550 #endif /* CONFIG_ETRAX_IDE */
1551 #ifdef CONFIG_BLK_DEV_CMD640
1552         {
1553                 extern void ide_probe_for_cmd640x(void);
1554                 ide_probe_for_cmd640x();
1555         }
1556 #endif /* CONFIG_BLK_DEV_CMD640 */
1557 #ifdef CONFIG_BLK_DEV_IDE_PMAC
1558         {
1559                 extern int pmac_ide_probe(void);
1560                 (void)pmac_ide_probe();
1561         }
1562 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
1563 #ifdef CONFIG_BLK_DEV_GAYLE
1564         {
1565                 extern void gayle_init(void);
1566                 gayle_init();
1567         }
1568 #endif /* CONFIG_BLK_DEV_GAYLE */
1569 #ifdef CONFIG_BLK_DEV_FALCON_IDE
1570         {
1571                 extern void falconide_init(void);
1572                 falconide_init();
1573         }
1574 #endif /* CONFIG_BLK_DEV_FALCON_IDE */
1575 #ifdef CONFIG_BLK_DEV_MAC_IDE
1576         {
1577                 extern void macide_init(void);
1578                 macide_init();
1579         }
1580 #endif /* CONFIG_BLK_DEV_MAC_IDE */
1581 #ifdef CONFIG_BLK_DEV_Q40IDE
1582         {
1583                 extern void q40ide_init(void);
1584                 q40ide_init();
1585         }
1586 #endif /* CONFIG_BLK_DEV_Q40IDE */
1587 #ifdef CONFIG_BLK_DEV_BUDDHA
1588         {
1589                 extern void buddha_init(void);
1590                 buddha_init();
1591         }
1592 #endif /* CONFIG_BLK_DEV_BUDDHA */
1593 #ifdef CONFIG_BLK_DEV_IDEPNP
1594         pnpide_init();
1595 #endif
1596 #ifdef CONFIG_H8300
1597         h8300_ide_init();
1598 #endif
1599 }
1600
1601 /*
1602  * Probe module
1603  */
1604
1605 EXPORT_SYMBOL(ide_lock);
1606
1607 static int ide_bus_match(struct device *dev, struct device_driver *drv)
1608 {
1609         return 1;
1610 }
1611
1612 static char *media_string(ide_drive_t *drive)
1613 {
1614         switch (drive->media) {
1615         case ide_disk:
1616                 return "disk";
1617         case ide_cdrom:
1618                 return "cdrom";
1619         case ide_tape:
1620                 return "tape";
1621         case ide_floppy:
1622                 return "floppy";
1623         case ide_optical:
1624                 return "optical";
1625         default:
1626                 return "UNKNOWN";
1627         }
1628 }
1629
1630 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
1631 {
1632         ide_drive_t *drive = to_ide_device(dev);
1633         return sprintf(buf, "%s\n", media_string(drive));
1634 }
1635
1636 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
1637 {
1638         ide_drive_t *drive = to_ide_device(dev);
1639         return sprintf(buf, "%s\n", drive->name);
1640 }
1641
1642 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1643 {
1644         ide_drive_t *drive = to_ide_device(dev);
1645         return sprintf(buf, "ide:m-%s\n", media_string(drive));
1646 }
1647
1648 static struct device_attribute ide_dev_attrs[] = {
1649         __ATTR_RO(media),
1650         __ATTR_RO(drivename),
1651         __ATTR_RO(modalias),
1652         __ATTR_NULL
1653 };
1654
1655 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
1656 {
1657         ide_drive_t *drive = to_ide_device(dev);
1658
1659         add_uevent_var(env, "MEDIA=%s", media_string(drive));
1660         add_uevent_var(env, "DRIVENAME=%s", drive->name);
1661         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
1662         return 0;
1663 }
1664
1665 static int generic_ide_probe(struct device *dev)
1666 {
1667         ide_drive_t *drive = to_ide_device(dev);
1668         ide_driver_t *drv = to_ide_driver(dev->driver);
1669
1670         return drv->probe ? drv->probe(drive) : -ENODEV;
1671 }
1672
1673 static int generic_ide_remove(struct device *dev)
1674 {
1675         ide_drive_t *drive = to_ide_device(dev);
1676         ide_driver_t *drv = to_ide_driver(dev->driver);
1677
1678         if (drv->remove)
1679                 drv->remove(drive);
1680
1681         return 0;
1682 }
1683
1684 static void generic_ide_shutdown(struct device *dev)
1685 {
1686         ide_drive_t *drive = to_ide_device(dev);
1687         ide_driver_t *drv = to_ide_driver(dev->driver);
1688
1689         if (dev->driver && drv->shutdown)
1690                 drv->shutdown(drive);
1691 }
1692
1693 struct bus_type ide_bus_type = {
1694         .name           = "ide",
1695         .match          = ide_bus_match,
1696         .uevent         = ide_uevent,
1697         .probe          = generic_ide_probe,
1698         .remove         = generic_ide_remove,
1699         .shutdown       = generic_ide_shutdown,
1700         .dev_attrs      = ide_dev_attrs,
1701         .suspend        = generic_ide_suspend,
1702         .resume         = generic_ide_resume,
1703 };
1704
1705 EXPORT_SYMBOL_GPL(ide_bus_type);
1706
1707 /*
1708  * This is gets invoked once during initialization, to set *everything* up
1709  */
1710 static int __init ide_init(void)
1711 {
1712         int ret;
1713
1714         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver " REVISION "\n");
1715         system_bus_speed = ide_system_bus_speed();
1716
1717         ret = bus_register(&ide_bus_type);
1718         if (ret < 0) {
1719                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1720                 return ret;
1721         }
1722
1723         init_ide_data();
1724
1725         proc_ide_create();
1726
1727 #ifdef CONFIG_BLK_DEV_ALI14XX
1728         if (probe_ali14xx)
1729                 (void)ali14xx_init();
1730 #endif
1731 #ifdef CONFIG_BLK_DEV_UMC8672
1732         if (probe_umc8672)
1733                 (void)umc8672_init();
1734 #endif
1735 #ifdef CONFIG_BLK_DEV_DTC2278
1736         if (probe_dtc2278)
1737                 (void)dtc2278_init();
1738 #endif
1739 #ifdef CONFIG_BLK_DEV_HT6560B
1740         if (probe_ht6560b)
1741                 (void)ht6560b_init();
1742 #endif
1743 #ifdef CONFIG_BLK_DEV_QD65XX
1744         if (probe_qd65xx)
1745                 (void)qd65xx_init();
1746 #endif
1747
1748         /* Probe for special PCI and other "known" interface chipsets. */
1749         probe_for_hwifs();
1750
1751         return 0;
1752 }
1753
1754 #ifdef MODULE
1755 static char *options = NULL;
1756 module_param(options, charp, 0);
1757 MODULE_LICENSE("GPL");
1758
1759 static void __init parse_options (char *line)
1760 {
1761         char *next = line;
1762
1763         if (line == NULL || !*line)
1764                 return;
1765         while ((line = next) != NULL) {
1766                 if ((next = strchr(line,' ')) != NULL)
1767                         *next++ = 0;
1768                 if (!ide_setup(line))
1769                         printk (KERN_INFO "Unknown option '%s'\n", line);
1770         }
1771 }
1772
1773 int __init init_module (void)
1774 {
1775         parse_options(options);
1776         return ide_init();
1777 }
1778
1779 void __exit cleanup_module (void)
1780 {
1781         int index;
1782
1783         for (index = 0; index < MAX_HWIFS; ++index)
1784                 ide_unregister(index);
1785
1786 #ifdef CONFIG_BLK_DEV_IDEPNP
1787         pnpide_exit();
1788 #endif
1789
1790         proc_ide_destroy();
1791
1792         bus_unregister(&ide_bus_type);
1793 }
1794
1795 #else /* !MODULE */
1796
1797 __setup("", ide_setup);
1798
1799 module_init(ide_init);
1800
1801 #endif /* MODULE */