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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 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) {
 719                 probe_hwif_init(hwif);
 720                 ide_proc_register_port(hwif);
 721         }
 722
 723         if (hwifp)
 724                 *hwifp = hwif;
 725
 726         return (initializing || hwif->present) ? index : -1;
 727 }
 728
 729 EXPORT_SYMBOL(ide_register_hw);
 730
 731 /*
 732  *      Locks for IDE setting functionality
 733  */
 734
 735 DEFINE_MUTEX(ide_setting_mtx);
 736
 737 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 738
 739 /**
 740  *      ide_spin_wait_hwgroup   -       wait for group
 741  *      @drive: drive in the group
 742  *
 743  *      Wait for an IDE device group to go non busy and then return
 744  *      holding the ide_lock which guards the hwgroup->busy status
 745  *      and right to use it.
 746  */
 747
 748 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 749 {
 750         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 751         unsigned long timeout = jiffies + (3 * HZ);
 752
 753         spin_lock_irq(&ide_lock);
 754
 755         while (hwgroup->busy) {
 756                 unsigned long lflags;
 757                 spin_unlock_irq(&ide_lock);
 758                 local_irq_set(lflags);
 759                 if (time_after(jiffies, timeout)) {
 760                         local_irq_restore(lflags);
 761                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 762                         return -EBUSY;
 763                 }
 764                 local_irq_restore(lflags);
 765                 spin_lock_irq(&ide_lock);
 766         }
 767         return 0;
 768 }
 769
 770 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 771
 772 int set_io_32bit(ide_drive_t *drive, int arg)
 773 {
 774         if (drive->no_io_32bit)
 775                 return -EPERM;
 776
 777         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 778                 return -EINVAL;
 779
 780         drive->io_32bit = arg;
 781 #ifdef CONFIG_BLK_DEV_DTC2278
 782         if (HWIF(drive)->chipset == ide_dtc2278)
 783                 HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
 784 #endif /* CONFIG_BLK_DEV_DTC2278 */
 785         return 0;
 786 }
 787
 788 static int set_ksettings(ide_drive_t *drive, int arg)
 789 {
 790         if (arg < 0 || arg > 1)
 791                 return -EINVAL;
 792
 793         if (ide_spin_wait_hwgroup(drive))
 794                 return -EBUSY;
 795         drive->keep_settings = arg;
 796         spin_unlock_irq(&ide_lock);
 797
 798         return 0;
 799 }
 800
 801 int set_using_dma(ide_drive_t *drive, int arg)
 802 {
 803 #ifdef CONFIG_BLK_DEV_IDEDMA
 804         ide_hwif_t *hwif = drive->hwif;
 805         int err = -EPERM;
 806
 807         if (arg < 0 || arg > 1)
 808                 return -EINVAL;
 809
 810         if (!drive->id || !(drive->id->capability & 1))
 811                 goto out;
 812
 813         if (hwif->ide_dma_on == NULL)
 814                 goto out;
 815
 816         err = -EBUSY;
 817         if (ide_spin_wait_hwgroup(drive))
 818                 goto out;
 819         /*
 820          * set ->busy flag, unlock and let it ride
 821          */
 822         hwif->hwgroup->busy = 1;
 823         spin_unlock_irq(&ide_lock);
 824
 825         err = 0;
 826
 827         if (arg) {
 828                 hwif->dma_off_quietly(drive);
 829                 if (ide_set_dma(drive) || hwif->ide_dma_on(drive))
 830                         err = -EIO;
 831         } else
 832                 ide_dma_off(drive);
 833
 834         /*
 835          * lock, clear ->busy flag and unlock before leaving
 836          */
 837         spin_lock_irq(&ide_lock);
 838         hwif->hwgroup->busy = 0;
 839         spin_unlock_irq(&ide_lock);
 840 out:
 841         return err;
 842 #else
 843         if (arg < 0 || arg > 1)
 844                 return -EINVAL;
 845
 846         return -EPERM;
 847 #endif
 848 }
 849
 850 int set_pio_mode(ide_drive_t *drive, int arg)
 851 {
 852         struct request rq;
 853
 854         if (arg < 0 || arg > 255)
 855                 return -EINVAL;
 856
 857         if (drive->hwif->set_pio_mode == NULL)
 858                 return -ENOSYS;
 859
 860         if (drive->special.b.set_tune)
 861                 return -EBUSY;
 862         ide_init_drive_cmd(&rq);
 863         drive->tune_req = (u8) arg;
 864         drive->special.b.set_tune = 1;
 865         (void) ide_do_drive_cmd(drive, &rq, ide_wait);
 866         return 0;
 867 }
 868
 869 static int set_unmaskirq(ide_drive_t *drive, int arg)
 870 {
 871         if (drive->no_unmask)
 872                 return -EPERM;
 873
 874         if (arg < 0 || arg > 1)
 875                 return -EINVAL;
 876
 877         if (ide_spin_wait_hwgroup(drive))
 878                 return -EBUSY;
 879         drive->unmask = arg;
 880         spin_unlock_irq(&ide_lock);
 881
 882         return 0;
 883 }
 884
 885 /**
 886  *      system_bus_clock        -       clock guess
 887  *
 888  *      External version of the bus clock guess used by very old IDE drivers
 889  *      for things like VLB timings. Should not be used.
 890  */
 891
 892 int system_bus_clock (void)
 893 {
 894         return((int) ((!system_bus_speed) ? ide_system_bus_speed() : system_bus_speed ));
 895 }
 896
 897 EXPORT_SYMBOL(system_bus_clock);
 898
 899 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 900 {
 901         ide_drive_t *drive = dev->driver_data;
 902         ide_hwif_t *hwif = HWIF(drive);
 903         struct request rq;
 904         struct request_pm_state rqpm;
 905         ide_task_t args;
 906         int ret;
 907
 908         /* Call ACPI _GTM only once */
 909         if (!(drive->dn % 2))
 910                 ide_acpi_get_timing(hwif);
 911
 912         memset(&rq, 0, sizeof(rq));
 913         memset(&rqpm, 0, sizeof(rqpm));
 914         memset(&args, 0, sizeof(args));
 915         rq.cmd_type = REQ_TYPE_PM_SUSPEND;
 916         rq.special = &args;
 917         rq.data = &rqpm;
 918         rqpm.pm_step = ide_pm_state_start_suspend;
 919         if (mesg.event == PM_EVENT_PRETHAW)
 920                 mesg.event = PM_EVENT_FREEZE;
 921         rqpm.pm_state = mesg.event;
 922
 923         ret = ide_do_drive_cmd(drive, &rq, ide_wait);
 924         /* only call ACPI _PS3 after both drivers are suspended */
 925         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 926                  && hwif->drives[1].present)
 927                  || !hwif->drives[0].present
 928                  || !hwif->drives[1].present))
 929                 ide_acpi_set_state(hwif, 0);
 930         return ret;
 931 }
 932
 933 static int generic_ide_resume(struct device *dev)
 934 {
 935         ide_drive_t *drive = dev->driver_data;
 936         ide_hwif_t *hwif = HWIF(drive);
 937         struct request rq;
 938         struct request_pm_state rqpm;
 939         ide_task_t args;
 940         int err;
 941
 942         /* Call ACPI _STM only once */
 943         if (!(drive->dn % 2)) {
 944                 ide_acpi_set_state(hwif, 1);
 945                 ide_acpi_push_timing(hwif);
 946         }
 947
 948         ide_acpi_exec_tfs(drive);
 949
 950         memset(&rq, 0, sizeof(rq));
 951         memset(&rqpm, 0, sizeof(rqpm));
 952         memset(&args, 0, sizeof(args));
 953         rq.cmd_type = REQ_TYPE_PM_RESUME;
 954         rq.special = &args;
 955         rq.data = &rqpm;
 956         rqpm.pm_step = ide_pm_state_start_resume;
 957         rqpm.pm_state = PM_EVENT_ON;
 958
 959         err = ide_do_drive_cmd(drive, &rq, ide_head_wait);
 960
 961         if (err == 0 && dev->driver) {
 962                 ide_driver_t *drv = to_ide_driver(dev->driver);
 963
 964                 if (drv->resume)
 965                         drv->resume(drive);
 966         }
 967
 968         return err;
 969 }
 970
 971 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 972                         unsigned int cmd, unsigned long arg)
 973 {
 974         unsigned long flags;
 975         ide_driver_t *drv;
 976         void __user *p = (void __user *)arg;
 977         int err = 0, (*setfunc)(ide_drive_t *, int);
 978         u8 *val;
 979
 980         switch (cmd) {
 981         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
 982         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
 983         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
 984         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
 985         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
 986         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
 987         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
 988         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
 989         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
 990         }
 991
 992         switch (cmd) {
 993                 case HDIO_OBSOLETE_IDENTITY:
 994                 case HDIO_GET_IDENTITY:
 995                         if (bdev != bdev->bd_contains)
 996                                 return -EINVAL;
 997                         if (drive->id_read == 0)
 998                                 return -ENOMSG;
 999                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
1000                                 return -EFAULT;
1001                         return 0;
1002
1003                 case HDIO_GET_NICE:
1004                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
1005                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
1006                                         drive->nice0            <<      IDE_NICE_0              |
1007                                         drive->nice1            <<      IDE_NICE_1              |
1008                                         drive->nice2            <<      IDE_NICE_2,
1009                                         (long __user *) arg);
1010
1011 #ifdef CONFIG_IDE_TASK_IOCTL
1012                 case HDIO_DRIVE_TASKFILE:
1013                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1014                                 return -EACCES;
1015                         switch(drive->media) {
1016                                 case ide_disk:
1017                                         return ide_taskfile_ioctl(drive, cmd, arg);
1018                                 default:
1019                                         return -ENOMSG;
1020                         }
1021 #endif /* CONFIG_IDE_TASK_IOCTL */
1022
1023                 case HDIO_DRIVE_CMD:
1024                         if (!capable(CAP_SYS_RAWIO))
1025                                 return -EACCES;
1026                         return ide_cmd_ioctl(drive, cmd, arg);
1027
1028                 case HDIO_DRIVE_TASK:
1029                         if (!capable(CAP_SYS_RAWIO))
1030                                 return -EACCES;
1031                         return ide_task_ioctl(drive, cmd, arg);
1032
1033                 case HDIO_SCAN_HWIF:
1034                 {
1035                         hw_regs_t hw;
1036                         int args[3];
1037                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1038                         if (copy_from_user(args, p, 3 * sizeof(int)))
1039                                 return -EFAULT;
1040                         memset(&hw, 0, sizeof(hw));
1041                         ide_init_hwif_ports(&hw, (unsigned long) args[0],
1042                                             (unsigned long) args[1], NULL);
1043                         hw.irq = args[2];
1044                         if (ide_register_hw(&hw, NULL, 0, NULL) == -1)
1045                                 return -EIO;
1046                         return 0;
1047                 }
1048                 case HDIO_UNREGISTER_HWIF:
1049                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1050                         /* (arg > MAX_HWIFS) checked in function */
1051                         ide_unregister(arg);
1052                         return 0;
1053                 case HDIO_SET_NICE:
1054                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1055                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
1056                                 return -EPERM;
1057                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
1058                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
1059                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
1060                                 drive->dsc_overlap = 0;
1061                                 return -EPERM;
1062                         }
1063                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
1064                         return 0;
1065                 case HDIO_DRIVE_RESET:
1066                 {
1067                         unsigned long flags;
1068                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1069
1070                         /*
1071                          *      Abort the current command on the
1072                          *      group if there is one, taking
1073                          *      care not to allow anything else
1074                          *      to be queued and to die on the
1075                          *      spot if we miss one somehow
1076                          */
1077
1078                         spin_lock_irqsave(&ide_lock, flags);
1079
1080                         if (HWGROUP(drive)->resetting) {
1081                                 spin_unlock_irqrestore(&ide_lock, flags);
1082                                 return -EBUSY;
1083                         }
1084
1085                         ide_abort(drive, "drive reset");
1086
1087                         BUG_ON(HWGROUP(drive)->handler);
1088
1089                         /* Ensure nothing gets queued after we
1090                            drop the lock. Reset will clear the busy */
1091
1092                         HWGROUP(drive)->busy = 1;
1093                         spin_unlock_irqrestore(&ide_lock, flags);
1094                         (void) ide_do_reset(drive);
1095
1096                         return 0;
1097                 }
1098
1099                 case HDIO_GET_BUSSTATE:
1100                         if (!capable(CAP_SYS_ADMIN))
1101                                 return -EACCES;
1102                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
1103                                 return -EFAULT;
1104                         return 0;
1105
1106                 case HDIO_SET_BUSSTATE:
1107                         if (!capable(CAP_SYS_ADMIN))
1108                                 return -EACCES;
1109                         if (HWIF(drive)->busproc)
1110                                 return HWIF(drive)->busproc(drive, (int)arg);
1111                         return -EOPNOTSUPP;
1112                 default:
1113                         return -EINVAL;
1114         }
1115
1116 read_val:
1117         mutex_lock(&ide_setting_mtx);
1118         spin_lock_irqsave(&ide_lock, flags);
1119         err = *val;
1120         spin_unlock_irqrestore(&ide_lock, flags);
1121         mutex_unlock(&ide_setting_mtx);
1122         return err >= 0 ? put_user(err, (long __user *)arg) : err;
1123
1124 set_val:
1125         if (bdev != bdev->bd_contains)
1126                 err = -EINVAL;
1127         else {
1128                 if (!capable(CAP_SYS_ADMIN))
1129                         err = -EACCES;
1130                 else {
1131                         mutex_lock(&ide_setting_mtx);
1132                         err = setfunc(drive, arg);
1133                         mutex_unlock(&ide_setting_mtx);
1134                 }
1135         }
1136         return err;
1137 }
1138
1139 EXPORT_SYMBOL(generic_ide_ioctl);
1140
1141 /*
1142  * stridx() returns the offset of c within s,
1143  * or -1 if c is '\0' or not found within s.
1144  */
1145 static int __init stridx (const char *s, char c)
1146 {
1147         char *i = strchr(s, c);
1148         return (i && c) ? i - s : -1;
1149 }
1150
1151 /*
1152  * match_parm() does parsing for ide_setup():
1153  *
1154  * 1. the first char of s must be '='.
1155  * 2. if the remainder matches one of the supplied keywords,
1156  *     the index (1 based) of the keyword is negated and returned.
1157  * 3. if the remainder is a series of no more than max_vals numbers
1158  *     separated by commas, the numbers are saved in vals[] and a
1159  *     count of how many were saved is returned.  Base10 is assumed,
1160  *     and base16 is allowed when prefixed with "0x".
1161  * 4. otherwise, zero is returned.
1162  */
1163 static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
1164 {
1165         static const char *decimal = "0123456789";
1166         static const char *hex = "0123456789abcdef";
1167         int i, n;
1168
1169         if (*s++ == '=') {
1170                 /*
1171                  * Try matching against the supplied keywords,
1172                  * and return -(index+1) if we match one
1173                  */
1174                 if (keywords != NULL) {
1175                         for (i = 0; *keywords != NULL; ++i) {
1176                                 if (!strcmp(s, *keywords++))
1177                                         return -(i+1);
1178                         }
1179                 }
1180                 /*
1181                  * Look for a series of no more than "max_vals"
1182                  * numeric values separated by commas, in base10,
1183                  * or base16 when prefixed with "0x".
1184                  * Return a count of how many were found.
1185                  */
1186                 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
1187                         vals[n] = i;
1188                         while ((i = stridx(decimal, *++s)) >= 0)
1189                                 vals[n] = (vals[n] * 10) + i;
1190                         if (*s == 'x' && !vals[n]) {
1191                                 while ((i = stridx(hex, *++s)) >= 0)
1192                                         vals[n] = (vals[n] * 0x10) + i;
1193                         }
1194                         if (++n == max_vals)
1195                                 break;
1196                         if (*s == ',' || *s == ';')
1197                                 ++s;
1198                 }
1199                 if (!*s)
1200                         return n;
1201         }
1202         return 0;       /* zero = nothing matched */
1203 }
1204
1205 #ifdef CONFIG_BLK_DEV_ALI14XX
1206 extern int probe_ali14xx;
1207 extern int ali14xx_init(void);
1208 #endif
1209 #ifdef CONFIG_BLK_DEV_UMC8672
1210 extern int probe_umc8672;
1211 extern int umc8672_init(void);
1212 #endif
1213 #ifdef CONFIG_BLK_DEV_DTC2278
1214 extern int probe_dtc2278;
1215 extern int dtc2278_init(void);
1216 #endif
1217 #ifdef CONFIG_BLK_DEV_HT6560B
1218 extern int probe_ht6560b;
1219 extern int ht6560b_init(void);
1220 #endif
1221 #ifdef CONFIG_BLK_DEV_QD65XX
1222 extern int probe_qd65xx;
1223 extern int qd65xx_init(void);
1224 #endif
1225
1226 static int __initdata is_chipset_set[MAX_HWIFS];
1227
1228 /*
1229  * ide_setup() gets called VERY EARLY during initialization,
1230  * to handle kernel "command line" strings beginning with "hdx=" or "ide".
1231  *
1232  * Remember to update Documentation/ide.txt if you change something here.
1233  */
1234 static int __init ide_setup(char *s)
1235 {
1236         int i, vals[3];
1237         ide_hwif_t *hwif;
1238         ide_drive_t *drive;
1239         unsigned int hw, unit;
1240         const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
1241         const char max_hwif  = '0' + (MAX_HWIFS - 1);
1242
1243
1244         if (strncmp(s,"hd",2) == 0 && s[2] == '=')      /* hd= is for hd.c   */
1245                 return 0;                               /* driver and not us */
1246
1247         if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
1248                 return 0;
1249
1250         printk(KERN_INFO "ide_setup: %s", s);
1251         init_ide_data ();
1252
1253 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
1254         if (!strcmp(s, "ide=doubler")) {
1255                 extern int ide_doubler;
1256
1257                 printk(" : Enabled support for IDE doublers\n");
1258                 ide_doubler = 1;
1259                 return 1;
1260         }
1261 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
1262
1263         if (!strcmp(s, "ide=nodma")) {
1264                 printk(" : Prevented DMA\n");
1265                 noautodma = 1;
1266                 goto obsolete_option;
1267         }
1268
1269 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
1270         if (!strcmp(s, "ide=reverse")) {
1271                 ide_scan_direction = 1;
1272                 printk(" : Enabled support for IDE inverse scan order.\n");
1273                 return 1;
1274         }
1275 #endif
1276
1277 #ifdef CONFIG_BLK_DEV_IDEACPI
1278         if (!strcmp(s, "ide=noacpi")) {
1279                 //printk(" : Disable IDE ACPI support.\n");
1280                 ide_noacpi = 1;
1281                 return 1;
1282         }
1283         if (!strcmp(s, "ide=acpigtf")) {
1284                 //printk(" : Enable IDE ACPI _GTF support.\n");
1285                 ide_noacpitfs = 0;
1286                 return 1;
1287         }
1288         if (!strcmp(s, "ide=acpionboot")) {
1289                 //printk(" : Call IDE ACPI methods on boot.\n");
1290                 ide_noacpionboot = 0;
1291                 return 1;
1292         }
1293 #endif /* CONFIG_BLK_DEV_IDEACPI */
1294
1295         /*
1296          * Look for drive options:  "hdx="
1297          */
1298         if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
1299                 const char *hd_words[] = {
1300                         "none", "noprobe", "nowerr", "cdrom", "nodma",
1301                         "autotune", "noautotune", "minus8", "swapdata", "bswap",
1302                         "noflush", "remap", "remap63", "scsi", NULL };
1303                 unit = s[2] - 'a';
1304                 hw   = unit / MAX_DRIVES;
1305                 unit = unit % MAX_DRIVES;
1306                 hwif = &ide_hwifs[hw];
1307                 drive = &hwif->drives[unit];
1308                 if (strncmp(s + 4, "ide-", 4) == 0) {
1309                         strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
1310                         goto done;
1311                 }
1312                 switch (match_parm(&s[3], hd_words, vals, 3)) {
1313                         case -1: /* "none" */
1314                         case -2: /* "noprobe" */
1315                                 drive->noprobe = 1;
1316                                 goto done;
1317                         case -3: /* "nowerr" */
1318                                 drive->bad_wstat = BAD_R_STAT;
1319                                 hwif->noprobe = 0;
1320                                 goto done;
1321                         case -4: /* "cdrom" */
1322                                 drive->present = 1;
1323                                 drive->media = ide_cdrom;
1324                                 /* an ATAPI device ignores DRDY */
1325                                 drive->ready_stat = 0;
1326                                 hwif->noprobe = 0;
1327                                 goto done;
1328                         case -5: /* nodma */
1329                                 drive->nodma = 1;
1330                                 goto done;
1331                         case -6: /* "autotune" */
1332                                 drive->autotune = IDE_TUNE_AUTO;
1333                                 goto obsolete_option;
1334                         case -7: /* "noautotune" */
1335                                 drive->autotune = IDE_TUNE_NOAUTO;
1336                                 goto obsolete_option;
1337                         case -9: /* "swapdata" */
1338                         case -10: /* "bswap" */
1339                                 drive->bswap = 1;
1340                                 goto done;
1341                         case -11: /* noflush */
1342                                 drive->noflush = 1;
1343                                 goto done;
1344                         case -12: /* "remap" */
1345                                 drive->remap_0_to_1 = 1;
1346                                 goto done;
1347                         case -13: /* "remap63" */
1348                                 drive->sect0 = 63;
1349                                 goto done;
1350                         case -14: /* "scsi" */
1351                                 drive->scsi = 1;
1352                                 goto done;
1353                         case 3: /* cyl,head,sect */
1354                                 drive->media    = ide_disk;
1355                                 drive->ready_stat = READY_STAT;
1356                                 drive->cyl      = drive->bios_cyl  = vals[0];
1357                                 drive->head     = drive->bios_head = vals[1];
1358                                 drive->sect     = drive->bios_sect = vals[2];
1359                                 drive->present  = 1;
1360                                 drive->forced_geom = 1;
1361                                 hwif->noprobe = 0;
1362                                 goto done;
1363                         default:
1364                                 goto bad_option;
1365                 }
1366         }
1367
1368         if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
1369                 goto bad_option;
1370         /*
1371          * Look for bus speed option:  "idebus="
1372          */
1373         if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
1374                 if (match_parm(&s[6], NULL, vals, 1) != 1)
1375                         goto bad_option;
1376                 if (vals[0] >= 20 && vals[0] <= 66) {
1377                         idebus_parameter = vals[0];
1378                 } else
1379                         printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
1380                 goto done;
1381         }
1382         /*
1383          * Look for interface options:  "idex="
1384          */
1385         if (s[3] >= '0' && s[3] <= max_hwif) {
1386                 /*
1387                  * Be VERY CAREFUL changing this: note hardcoded indexes below
1388                  * (-8, -9, -10) are reserved to ease the hardcoding.
1389                  */
1390                 static const char *ide_words[] = {
1391                         "noprobe", "serialize", "minus3", "minus4",
1392                         "reset", "minus6", "ata66", "minus8", "minus9",
1393                         "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
1394                         "dtc2278", "umc8672", "ali14xx", NULL };
1395                 hw = s[3] - '0';
1396                 hwif = &ide_hwifs[hw];
1397                 i = match_parm(&s[4], ide_words, vals, 3);
1398
1399                 /*
1400                  * Cryptic check to ensure chipset not already set for hwif.
1401                  * Note: we can't depend on hwif->chipset here.
1402                  */
1403                 if ((i >= -18 && i <= -11) || (i > 0 && i <= 3)) {
1404                         /* chipset already specified */
1405                         if (is_chipset_set[hw])
1406                                 goto bad_option;
1407                         if (i > -18 && i <= -11) {
1408                                 /* these drivers are for "ide0=" only */
1409                                 if (hw != 0)
1410                                         goto bad_hwif;
1411                                 /* chipset already specified for 2nd port */
1412                                 if (is_chipset_set[hw+1])
1413                                         goto bad_option;
1414                         }
1415                         is_chipset_set[hw] = 1;
1416                         printk("\n");
1417                 }
1418
1419                 switch (i) {
1420 #ifdef CONFIG_BLK_DEV_ALI14XX
1421                         case -17: /* "ali14xx" */
1422                                 probe_ali14xx = 1;
1423                                 goto done;
1424 #endif
1425 #ifdef CONFIG_BLK_DEV_UMC8672
1426                         case -16: /* "umc8672" */
1427                                 probe_umc8672 = 1;
1428                                 goto done;
1429 #endif
1430 #ifdef CONFIG_BLK_DEV_DTC2278
1431                         case -15: /* "dtc2278" */
1432                                 probe_dtc2278 = 1;
1433                                 goto done;
1434 #endif
1435 #ifdef CONFIG_BLK_DEV_CMD640
1436                         case -14: /* "cmd640_vlb" */
1437                         {
1438                                 extern int cmd640_vlb; /* flag for cmd640.c */
1439                                 cmd640_vlb = 1;
1440                                 goto done;
1441                         }
1442 #endif
1443 #ifdef CONFIG_BLK_DEV_HT6560B
1444                         case -13: /* "ht6560b" */
1445                                 probe_ht6560b = 1;
1446                                 goto done;
1447 #endif
1448 #ifdef CONFIG_BLK_DEV_QD65XX
1449                         case -12: /* "qd65xx" */
1450                                 probe_qd65xx = 1;
1451                                 goto done;
1452 #endif
1453 #ifdef CONFIG_BLK_DEV_4DRIVES
1454                         case -11: /* "four" drives on one set of ports */
1455                         {
1456                                 ide_hwif_t *mate = &ide_hwifs[hw^1];
1457                                 mate->drives[0].select.all ^= 0x20;
1458                                 mate->drives[1].select.all ^= 0x20;
1459                                 hwif->chipset = mate->chipset = ide_4drives;
1460                                 mate->irq = hwif->irq;
1461                                 memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
1462                                 hwif->mate = mate;
1463                                 mate->mate = hwif;
1464                                 hwif->serialized = mate->serialized = 1;
1465                                 goto obsolete_option;
1466                         }
1467 #endif /* CONFIG_BLK_DEV_4DRIVES */
1468                         case -10: /* minus10 */
1469                         case -9: /* minus9 */
1470                         case -8: /* minus8 */
1471                         case -6:
1472                         case -4:
1473                         case -3:
1474                                 goto bad_option;
1475                         case -7: /* ata66 */
1476 #ifdef CONFIG_BLK_DEV_IDEPCI
1477                                 /*
1478                                  * Use ATA_CBL_PATA40_SHORT so drive side
1479                                  * cable detection is also overriden.
1480                                  */
1481                                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1482                                 goto obsolete_option;
1483 #else
1484                                 goto bad_hwif;
1485 #endif
1486                         case -5: /* "reset" */
1487                                 hwif->reset = 1;
1488                                 goto obsolete_option;
1489                         case -2: /* "serialize" */
1490                                 hwif->mate = &ide_hwifs[hw^1];
1491                                 hwif->mate->mate = hwif;
1492                                 hwif->serialized = hwif->mate->serialized = 1;
1493                                 goto obsolete_option;
1494
1495                         case -1: /* "noprobe" */
1496                                 hwif->noprobe = 1;
1497                                 goto done;
1498
1499                         case 1: /* base */
1500                                 vals[1] = vals[0] + 0x206; /* default ctl */
1501                         case 2: /* base,ctl */
1502                                 vals[2] = 0;    /* default irq = probe for it */
1503                         case 3: /* base,ctl,irq */
1504                                 hwif->hw.irq = vals[2];
1505                                 ide_init_hwif_ports(&hwif->hw, (unsigned long) vals[0], (unsigned long) vals[1], &hwif->irq);
1506                                 memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->io_ports));
1507                                 hwif->irq      = vals[2];
1508                                 hwif->noprobe  = 0;
1509                                 hwif->chipset  = ide_forced;
1510                                 goto obsolete_option;
1511
1512                         case 0: goto bad_option;
1513                         default:
1514                                 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
1515                                 return 1;
1516                 }
1517         }
1518 bad_option:
1519         printk(" -- BAD OPTION\n");
1520         return 1;
1521 obsolete_option:
1522         printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
1523         return 1;
1524 bad_hwif:
1525         printk("-- NOT SUPPORTED ON ide%d", hw);
1526 done:
1527         printk("\n");
1528         return 1;
1529 }
1530
1531 extern void __init pnpide_init(void);
1532 extern void __exit pnpide_exit(void);
1533 extern void __init h8300_ide_init(void);
1534
1535 /*
1536  * probe_for_hwifs() finds/initializes "known" IDE interfaces
1537  */
1538 static void __init probe_for_hwifs (void)
1539 {
1540 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
1541         ide_scan_pcibus(ide_scan_direction);
1542 #endif
1543
1544 #ifdef CONFIG_ETRAX_IDE
1545         {
1546                 extern void init_e100_ide(void);
1547                 init_e100_ide();
1548         }
1549 #endif /* CONFIG_ETRAX_IDE */
1550 #ifdef CONFIG_BLK_DEV_CMD640
1551         {
1552                 extern void ide_probe_for_cmd640x(void);
1553                 ide_probe_for_cmd640x();
1554         }
1555 #endif /* CONFIG_BLK_DEV_CMD640 */
1556 #ifdef CONFIG_BLK_DEV_IDE_PMAC
1557         {
1558                 extern int pmac_ide_probe(void);
1559                 (void)pmac_ide_probe();
1560         }
1561 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
1562 #ifdef CONFIG_BLK_DEV_GAYLE
1563         {
1564                 extern void gayle_init(void);
1565                 gayle_init();
1566         }
1567 #endif /* CONFIG_BLK_DEV_GAYLE */
1568 #ifdef CONFIG_BLK_DEV_FALCON_IDE
1569         {
1570                 extern void falconide_init(void);
1571                 falconide_init();
1572         }
1573 #endif /* CONFIG_BLK_DEV_FALCON_IDE */
1574 #ifdef CONFIG_BLK_DEV_MAC_IDE
1575         {
1576                 extern void macide_init(void);
1577                 macide_init();
1578         }
1579 #endif /* CONFIG_BLK_DEV_MAC_IDE */
1580 #ifdef CONFIG_BLK_DEV_Q40IDE
1581         {
1582                 extern void q40ide_init(void);
1583                 q40ide_init();
1584         }
1585 #endif /* CONFIG_BLK_DEV_Q40IDE */
1586 #ifdef CONFIG_BLK_DEV_BUDDHA
1587         {
1588                 extern void buddha_init(void);
1589                 buddha_init();
1590         }
1591 #endif /* CONFIG_BLK_DEV_BUDDHA */
1592 #ifdef CONFIG_BLK_DEV_IDEPNP
1593         pnpide_init();
1594 #endif
1595 #ifdef CONFIG_H8300
1596         h8300_ide_init();
1597 #endif
1598 }
1599
1600 /*
1601  * Probe module
1602  */
1603
1604 EXPORT_SYMBOL(ide_lock);
1605
1606 static int ide_bus_match(struct device *dev, struct device_driver *drv)
1607 {
1608         return 1;
1609 }
1610
1611 static char *media_string(ide_drive_t *drive)
1612 {
1613         switch (drive->media) {
1614         case ide_disk:
1615                 return "disk";
1616         case ide_cdrom:
1617                 return "cdrom";
1618         case ide_tape:
1619                 return "tape";
1620         case ide_floppy:
1621                 return "floppy";
1622         case ide_optical:
1623                 return "optical";
1624         default:
1625                 return "UNKNOWN";
1626         }
1627 }
1628
1629 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
1630 {
1631         ide_drive_t *drive = to_ide_device(dev);
1632         return sprintf(buf, "%s\n", media_string(drive));
1633 }
1634
1635 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
1636 {
1637         ide_drive_t *drive = to_ide_device(dev);
1638         return sprintf(buf, "%s\n", drive->name);
1639 }
1640
1641 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1642 {
1643         ide_drive_t *drive = to_ide_device(dev);
1644         return sprintf(buf, "ide:m-%s\n", media_string(drive));
1645 }
1646
1647 static struct device_attribute ide_dev_attrs[] = {
1648         __ATTR_RO(media),
1649         __ATTR_RO(drivename),
1650         __ATTR_RO(modalias),
1651         __ATTR_NULL
1652 };
1653
1654 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
1655 {
1656         ide_drive_t *drive = to_ide_device(dev);
1657
1658         add_uevent_var(env, "MEDIA=%s", media_string(drive));
1659         add_uevent_var(env, "DRIVENAME=%s", drive->name);
1660         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
1661         return 0;
1662 }
1663
1664 static int generic_ide_probe(struct device *dev)
1665 {
1666         ide_drive_t *drive = to_ide_device(dev);
1667         ide_driver_t *drv = to_ide_driver(dev->driver);
1668
1669         return drv->probe ? drv->probe(drive) : -ENODEV;
1670 }
1671
1672 static int generic_ide_remove(struct device *dev)
1673 {
1674         ide_drive_t *drive = to_ide_device(dev);
1675         ide_driver_t *drv = to_ide_driver(dev->driver);
1676
1677         if (drv->remove)
1678                 drv->remove(drive);
1679
1680         return 0;
1681 }
1682
1683 static void generic_ide_shutdown(struct device *dev)
1684 {
1685         ide_drive_t *drive = to_ide_device(dev);
1686         ide_driver_t *drv = to_ide_driver(dev->driver);
1687
1688         if (dev->driver && drv->shutdown)
1689                 drv->shutdown(drive);
1690 }
1691
1692 struct bus_type ide_bus_type = {
1693         .name           = "ide",
1694         .match          = ide_bus_match,
1695         .uevent         = ide_uevent,
1696         .probe          = generic_ide_probe,
1697         .remove         = generic_ide_remove,
1698         .shutdown       = generic_ide_shutdown,
1699         .dev_attrs      = ide_dev_attrs,
1700         .suspend        = generic_ide_suspend,
1701         .resume         = generic_ide_resume,
1702 };
1703
1704 EXPORT_SYMBOL_GPL(ide_bus_type);
1705
1706 /*
1707  * This is gets invoked once during initialization, to set *everything* up
1708  */
1709 static int __init ide_init(void)
1710 {
1711         int ret;
1712
1713         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver " REVISION "\n");
1714         system_bus_speed = ide_system_bus_speed();
1715
1716         ret = bus_register(&ide_bus_type);
1717         if (ret < 0) {
1718                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1719                 return ret;
1720         }
1721
1722         init_ide_data();
1723
1724         proc_ide_create();
1725
1726 #ifdef CONFIG_BLK_DEV_ALI14XX
1727         if (probe_ali14xx)
1728                 (void)ali14xx_init();
1729 #endif
1730 #ifdef CONFIG_BLK_DEV_UMC8672
1731         if (probe_umc8672)
1732                 (void)umc8672_init();
1733 #endif
1734 #ifdef CONFIG_BLK_DEV_DTC2278
1735         if (probe_dtc2278)
1736                 (void)dtc2278_init();
1737 #endif
1738 #ifdef CONFIG_BLK_DEV_HT6560B
1739         if (probe_ht6560b)
1740                 (void)ht6560b_init();
1741 #endif
1742 #ifdef CONFIG_BLK_DEV_QD65XX
1743         if (probe_qd65xx)
1744                 (void)qd65xx_init();
1745 #endif
1746
1747         /* Probe for special PCI and other "known" interface chipsets. */
1748         probe_for_hwifs();
1749
1750         return 0;
1751 }
1752
1753 #ifdef MODULE
1754 static char *options = NULL;
1755 module_param(options, charp, 0);
1756 MODULE_LICENSE("GPL");
1757
1758 static void __init parse_options (char *line)
1759 {
1760         char *next = line;
1761
1762         if (line == NULL || !*line)
1763                 return;
1764         while ((line = next) != NULL) {
1765                 if ((next = strchr(line,' ')) != NULL)
1766                         *next++ = 0;
1767                 if (!ide_setup(line))
1768                         printk (KERN_INFO "Unknown option '%s'\n", line);
1769         }
1770 }
1771
1772 int __init init_module (void)
1773 {
1774         parse_options(options);
1775         return ide_init();
1776 }
1777
1778 void __exit cleanup_module (void)
1779 {
1780         int index;
1781
1782         for (index = 0; index < MAX_HWIFS; ++index)
1783                 ide_unregister(index);
1784
1785 #ifdef CONFIG_BLK_DEV_IDEPNP
1786         pnpide_exit();
1787 #endif
1788
1789         proc_ide_destroy();
1790
1791         bus_unregister(&ide_bus_type);
1792 }
1793
1794 #else /* !MODULE */
1795
1796 __setup("", ide_setup);
1797
1798 module_init(ide_init);
1799
1800 #endif /* MODULE */