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 int ide_scan_direction; /* THIS was formerly 2.2.x pci=reverse */
  99 #endif
 100
 101 int noautodma = 0;
 102
 103 #ifdef CONFIG_BLK_DEV_IDEACPI
 104 int ide_noacpi = 0;
 105 int ide_noacpitfs = 1;
 106 int ide_noacpionboot = 1;
 107 #endif
 108
 109 /*
 110  * This is declared extern in ide.h, for access by other IDE modules:
 111  */
 112 ide_hwif_t ide_hwifs[MAX_HWIFS];        /* master data repository */
 113
 114 EXPORT_SYMBOL(ide_hwifs);
 115
 116 /*
 117  * Do not even *think* about calling this!
 118  */
 119 void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
 120 {
 121         unsigned int unit;
 122
 123         /* bulk initialize hwif & drive info with zeros */
 124         memset(hwif, 0, sizeof(ide_hwif_t));
 125
 126         /* fill in any non-zero initial values */
 127         hwif->index     = index;
 128         hwif->major     = ide_hwif_to_major[index];
 129
 130         hwif->name[0]   = 'i';
 131         hwif->name[1]   = 'd';
 132         hwif->name[2]   = 'e';
 133         hwif->name[3]   = '0' + index;
 134
 135         hwif->bus_state = BUSSTATE_ON;
 136
 137         init_completion(&hwif->gendev_rel_comp);
 138
 139         default_hwif_iops(hwif);
 140         default_hwif_transport(hwif);
 141         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 142                 ide_drive_t *drive = &hwif->drives[unit];
 143
 144                 drive->media                    = ide_disk;
 145                 drive->select.all               = (unit<<4)|0xa0;
 146                 drive->hwif                     = hwif;
 147                 drive->ctl                      = 0x08;
 148                 drive->ready_stat               = READY_STAT;
 149                 drive->bad_wstat                = BAD_W_STAT;
 150                 drive->special.b.recalibrate    = 1;
 151                 drive->special.b.set_geometry   = 1;
 152                 drive->name[0]                  = 'h';
 153                 drive->name[1]                  = 'd';
 154                 drive->name[2]                  = 'a' + (index * MAX_DRIVES) + unit;
 155                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
 156                 drive->using_dma                = 0;
 157                 drive->vdma                     = 0;
 158                 INIT_LIST_HEAD(&drive->list);
 159                 init_completion(&drive->gendev_rel_comp);
 160         }
 161 }
 162 EXPORT_SYMBOL_GPL(ide_init_port_data);
 163
 164 static void init_hwif_default(ide_hwif_t *hwif, unsigned int index)
 165 {
 166         hw_regs_t hw;
 167
 168         memset(&hw, 0, sizeof(hw_regs_t));
 169
 170         ide_init_hwif_ports(&hw, ide_default_io_base(index), 0, &hwif->irq);
 171
 172         memcpy(hwif->io_ports, hw.io_ports, sizeof(hw.io_ports));
 173
 174         hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
 175 #ifdef CONFIG_BLK_DEV_HD
 176         if (hwif->io_ports[IDE_DATA_OFFSET] == HD_DATA)
 177                 hwif->noprobe = 1;      /* may be overridden by ide_setup() */
 178 #endif
 179 }
 180
 181 /*
 182  * init_ide_data() sets reasonable default values into all fields
 183  * of all instances of the hwifs and drives, but only on the first call.
 184  * Subsequent calls have no effect (they don't wipe out anything).
 185  *
 186  * This routine is normally called at driver initialization time,
 187  * but may also be called MUCH earlier during kernel "command-line"
 188  * parameter processing.  As such, we cannot depend on any other parts
 189  * of the kernel (such as memory allocation) to be functioning yet.
 190  *
 191  * This is too bad, as otherwise we could dynamically allocate the
 192  * ide_drive_t structs as needed, rather than always consuming memory
 193  * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
 194  *
 195  * FIXME: We should stuff the setup data into __init and copy the
 196  * relevant hwifs/allocate them properly during boot.
 197  */
 198 #define MAGIC_COOKIE 0x12345678
 199 static void __init init_ide_data (void)
 200 {
 201         ide_hwif_t *hwif;
 202         unsigned int index;
 203         static unsigned long magic_cookie = MAGIC_COOKIE;
 204
 205         if (magic_cookie != MAGIC_COOKIE)
 206                 return;         /* already initialized */
 207         magic_cookie = 0;
 208
 209         /* Initialise all interface structures */
 210         for (index = 0; index < MAX_HWIFS; ++index) {
 211                 hwif = &ide_hwifs[index];
 212                 ide_init_port_data(hwif, index);
 213                 init_hwif_default(hwif, index);
 214 #if !defined(CONFIG_PPC32) || !defined(CONFIG_PCI)
 215                 hwif->irq =
 216                         ide_init_default_irq(hwif->io_ports[IDE_DATA_OFFSET]);
 217 #endif
 218         }
 219 }
 220
 221 /**
 222  *      ide_system_bus_speed    -       guess bus speed
 223  *
 224  *      ide_system_bus_speed() returns what we think is the system VESA/PCI
 225  *      bus speed (in MHz). This is used for calculating interface PIO timings.
 226  *      The default is 40 for known PCI systems, 50 otherwise.
 227  *      The "idebus=xx" parameter can be used to override this value.
 228  *      The actual value to be used is computed/displayed the first time
 229  *      through. Drivers should only use this as a last resort.
 230  *
 231  *      Returns a guessed speed in MHz.
 232  */
 233
 234 static int ide_system_bus_speed(void)
 235 {
 236 #ifdef CONFIG_PCI
 237         static struct pci_device_id pci_default[] = {
 238                 { PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID) },
 239                 { }
 240         };
 241 #else
 242 #define pci_default 0
 243 #endif /* CONFIG_PCI */
 244
 245         if (!system_bus_speed) {
 246                 if (idebus_parameter) {
 247                         /* user supplied value */
 248                         system_bus_speed = idebus_parameter;
 249                 } else if (pci_dev_present(pci_default)) {
 250                         /* safe default value for PCI */
 251                         system_bus_speed = 33;
 252                 } else {
 253                         /* safe default value for VESA and PCI */
 254                         system_bus_speed = 50;
 255                 }
 256                 printk(KERN_INFO "ide: Assuming %dMHz system bus speed "
 257                         "for PIO modes%s\n", system_bus_speed,
 258                         idebus_parameter ? "" : "; override with idebus=xx");
 259         }
 260         return system_bus_speed;
 261 }
 262
 263 ide_hwif_t * ide_find_port(unsigned long base)
 264 {
 265         ide_hwif_t *hwif;
 266         int i;
 267
 268         for (i = 0; i < MAX_HWIFS; i++) {
 269                 hwif = &ide_hwifs[i];
 270                 if (hwif->io_ports[IDE_DATA_OFFSET] == base)
 271                         goto found;
 272         }
 273
 274         for (i = 0; i < MAX_HWIFS; i++) {
 275                 hwif = &ide_hwifs[i];
 276                 if (hwif->io_ports[IDE_DATA_OFFSET] == 0)
 277                         goto found;
 278         }
 279
 280         hwif = NULL;
 281 found:
 282         return hwif;
 283 }
 284
 285 EXPORT_SYMBOL_GPL(ide_find_port);
 286
 287 static struct resource* hwif_request_region(ide_hwif_t *hwif,
 288                                             unsigned long addr, int num)
 289 {
 290         struct resource *res = request_region(addr, num, hwif->name);
 291
 292         if (!res)
 293                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
 294                                 hwif->name, addr, addr+num-1);
 295         return res;
 296 }
 297
 298 /**
 299  *      ide_hwif_request_regions - request resources for IDE
 300  *      @hwif: interface to use
 301  *
 302  *      Requests all the needed resources for an interface.
 303  *      Right now core IDE code does this work which is deeply wrong.
 304  *      MMIO leaves it to the controller driver,
 305  *      PIO will migrate this way over time.
 306  */
 307
 308 int ide_hwif_request_regions(ide_hwif_t *hwif)
 309 {
 310         unsigned long addr;
 311         unsigned int i;
 312
 313         if (hwif->mmio)
 314                 return 0;
 315         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 316         if (addr && !hwif_request_region(hwif, addr, 1))
 317                 goto control_region_busy;
 318         hwif->straight8 = 0;
 319         addr = hwif->io_ports[IDE_DATA_OFFSET];
 320         if ((addr | 7) == hwif->io_ports[IDE_STATUS_OFFSET]) {
 321                 if (!hwif_request_region(hwif, addr, 8))
 322                         goto data_region_busy;
 323                 hwif->straight8 = 1;
 324                 return 0;
 325         }
 326         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
 327                 addr = hwif->io_ports[i];
 328                 if (!hwif_request_region(hwif, addr, 1)) {
 329                         while (--i)
 330                                 release_region(addr, 1);
 331                         goto data_region_busy;
 332                 }
 333         }
 334         return 0;
 335
 336 data_region_busy:
 337         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 338         if (addr)
 339                 release_region(addr, 1);
 340 control_region_busy:
 341         /* If any errors are return, we drop the hwif interface. */
 342         return -EBUSY;
 343 }
 344
 345 /**
 346  *      ide_hwif_release_regions - free IDE resources
 347  *
 348  *      Note that we only release the standard ports,
 349  *      and do not even try to handle any extra ports
 350  *      allocated for weird IDE interface chipsets.
 351  *
 352  *      Note also that we don't yet handle mmio resources here. More
 353  *      importantly our caller should be doing this so we need to
 354  *      restructure this as a helper function for drivers.
 355  */
 356
 357 void ide_hwif_release_regions(ide_hwif_t *hwif)
 358 {
 359         u32 i = 0;
 360
 361         if (hwif->mmio)
 362                 return;
 363         if (hwif->io_ports[IDE_CONTROL_OFFSET])
 364                 release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
 365         if (hwif->straight8) {
 366                 release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
 367                 return;
 368         }
 369         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
 370                 if (hwif->io_ports[i])
 371                         release_region(hwif->io_ports[i], 1);
 372 }
 373
 374 /**
 375  *      ide_hwif_restore        -       restore hwif to template
 376  *      @hwif: hwif to update
 377  *      @tmp_hwif: template
 378  *
 379  *      Restore hwif to a previous state by copying most settings
 380  *      from the template.
 381  */
 382
 383 static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
 384 {
 385         hwif->hwgroup                   = tmp_hwif->hwgroup;
 386
 387         hwif->gendev.parent             = tmp_hwif->gendev.parent;
 388
 389         hwif->proc                      = tmp_hwif->proc;
 390
 391         hwif->major                     = tmp_hwif->major;
 392         hwif->straight8                 = tmp_hwif->straight8;
 393         hwif->bus_state                 = tmp_hwif->bus_state;
 394
 395         hwif->host_flags                = tmp_hwif->host_flags;
 396
 397         hwif->pio_mask                  = tmp_hwif->pio_mask;
 398
 399         hwif->ultra_mask                = tmp_hwif->ultra_mask;
 400         hwif->mwdma_mask                = tmp_hwif->mwdma_mask;
 401         hwif->swdma_mask                = tmp_hwif->swdma_mask;
 402
 403         hwif->cbl                       = tmp_hwif->cbl;
 404
 405         hwif->chipset                   = tmp_hwif->chipset;
 406         hwif->hold                      = tmp_hwif->hold;
 407
 408 #ifdef CONFIG_BLK_DEV_IDEPCI
 409         hwif->pci_dev                   = tmp_hwif->pci_dev;
 410         hwif->cds                       = tmp_hwif->cds;
 411 #endif
 412
 413         hwif->set_pio_mode              = tmp_hwif->set_pio_mode;
 414         hwif->set_dma_mode              = tmp_hwif->set_dma_mode;
 415         hwif->mdma_filter               = tmp_hwif->mdma_filter;
 416         hwif->udma_filter               = tmp_hwif->udma_filter;
 417         hwif->selectproc                = tmp_hwif->selectproc;
 418         hwif->reset_poll                = tmp_hwif->reset_poll;
 419         hwif->pre_reset                 = tmp_hwif->pre_reset;
 420         hwif->resetproc                 = tmp_hwif->resetproc;
 421         hwif->maskproc                  = tmp_hwif->maskproc;
 422         hwif->quirkproc                 = tmp_hwif->quirkproc;
 423         hwif->busproc                   = tmp_hwif->busproc;
 424
 425         hwif->ata_input_data            = tmp_hwif->ata_input_data;
 426         hwif->ata_output_data           = tmp_hwif->ata_output_data;
 427         hwif->atapi_input_bytes         = tmp_hwif->atapi_input_bytes;
 428         hwif->atapi_output_bytes        = tmp_hwif->atapi_output_bytes;
 429
 430         hwif->dma_host_set              = tmp_hwif->dma_host_set;
 431         hwif->dma_setup                 = tmp_hwif->dma_setup;
 432         hwif->dma_exec_cmd              = tmp_hwif->dma_exec_cmd;
 433         hwif->dma_start                 = tmp_hwif->dma_start;
 434         hwif->ide_dma_end               = tmp_hwif->ide_dma_end;
 435         hwif->ide_dma_test_irq          = tmp_hwif->ide_dma_test_irq;
 436         hwif->ide_dma_clear_irq         = tmp_hwif->ide_dma_clear_irq;
 437         hwif->dma_lost_irq              = tmp_hwif->dma_lost_irq;
 438         hwif->dma_timeout               = tmp_hwif->dma_timeout;
 439
 440         hwif->OUTB                      = tmp_hwif->OUTB;
 441         hwif->OUTBSYNC                  = tmp_hwif->OUTBSYNC;
 442         hwif->OUTW                      = tmp_hwif->OUTW;
 443         hwif->OUTSW                     = tmp_hwif->OUTSW;
 444         hwif->OUTSL                     = tmp_hwif->OUTSL;
 445
 446         hwif->INB                       = tmp_hwif->INB;
 447         hwif->INW                       = tmp_hwif->INW;
 448         hwif->INSW                      = tmp_hwif->INSW;
 449         hwif->INSL                      = tmp_hwif->INSL;
 450
 451         hwif->sg_max_nents              = tmp_hwif->sg_max_nents;
 452
 453         hwif->mmio                      = tmp_hwif->mmio;
 454         hwif->rqsize                    = tmp_hwif->rqsize;
 455
 456 #ifndef CONFIG_BLK_DEV_IDECS
 457         hwif->irq                       = tmp_hwif->irq;
 458 #endif
 459
 460         hwif->dma_base                  = tmp_hwif->dma_base;
 461         hwif->dma_command               = tmp_hwif->dma_command;
 462         hwif->dma_vendor1               = tmp_hwif->dma_vendor1;
 463         hwif->dma_status                = tmp_hwif->dma_status;
 464         hwif->dma_vendor3               = tmp_hwif->dma_vendor3;
 465         hwif->dma_prdtable              = tmp_hwif->dma_prdtable;
 466
 467         hwif->config_data               = tmp_hwif->config_data;
 468         hwif->select_data               = tmp_hwif->select_data;
 469         hwif->extra_base                = tmp_hwif->extra_base;
 470         hwif->extra_ports               = tmp_hwif->extra_ports;
 471
 472         hwif->hwif_data                 = tmp_hwif->hwif_data;
 473 }
 474
 475 /**
 476  *      ide_unregister          -       free an IDE interface
 477  *      @index: index of interface (will change soon to a pointer)
 478  *
 479  *      Perform the final unregister of an IDE interface. At the moment
 480  *      we don't refcount interfaces so this will also get split up.
 481  *
 482  *      Locking:
 483  *      The caller must not hold the IDE locks
 484  *      The drive present/vanishing is not yet properly locked
 485  *      Take care with the callbacks. These have been split to avoid
 486  *      deadlocking the IDE layer. The shutdown callback is called
 487  *      before we take the lock and free resources. It is up to the
 488  *      caller to be sure there is no pending I/O here, and that
 489  *      the interface will not be reopened (present/vanishing locking
 490  *      isn't yet done BTW). After we commit to the final kill we
 491  *      call the cleanup callback with the ide locks held.
 492  *
 493  *      Unregister restores the hwif structures to the default state.
 494  *      This is raving bonkers.
 495  */
 496
 497 void ide_unregister(unsigned int index)
 498 {
 499         ide_drive_t *drive;
 500         ide_hwif_t *hwif, *g;
 501         static ide_hwif_t tmp_hwif; /* protected by ide_cfg_mtx */
 502         ide_hwgroup_t *hwgroup;
 503         int irq_count = 0, unit;
 504
 505         BUG_ON(index >= MAX_HWIFS);
 506
 507         BUG_ON(in_interrupt());
 508         BUG_ON(irqs_disabled());
 509         mutex_lock(&ide_cfg_mtx);
 510         spin_lock_irq(&ide_lock);
 511         hwif = &ide_hwifs[index];
 512         if (!hwif->present)
 513                 goto abort;
 514         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 515                 drive = &hwif->drives[unit];
 516                 if (!drive->present)
 517                         continue;
 518                 spin_unlock_irq(&ide_lock);
 519                 device_unregister(&drive->gendev);
 520                 wait_for_completion(&drive->gendev_rel_comp);
 521                 spin_lock_irq(&ide_lock);
 522         }
 523         hwif->present = 0;
 524
 525         spin_unlock_irq(&ide_lock);
 526
 527         ide_proc_unregister_port(hwif);
 528
 529         hwgroup = hwif->hwgroup;
 530         /*
 531          * free the irq if we were the only hwif using it
 532          */
 533         g = hwgroup->hwif;
 534         do {
 535                 if (g->irq == hwif->irq)
 536                         ++irq_count;
 537                 g = g->next;
 538         } while (g != hwgroup->hwif);
 539         if (irq_count == 1)
 540                 free_irq(hwif->irq, hwgroup);
 541
 542         spin_lock_irq(&ide_lock);
 543         /*
 544          * Note that we only release the standard ports,
 545          * and do not even try to handle any extra ports
 546          * allocated for weird IDE interface chipsets.
 547          */
 548         ide_hwif_release_regions(hwif);
 549
 550         /*
 551          * Remove us from the hwgroup, and free
 552          * the hwgroup if we were the only member
 553          */
 554         if (hwif->next == hwif) {
 555                 BUG_ON(hwgroup->hwif != hwif);
 556                 kfree(hwgroup);
 557         } else {
 558                 /* There is another interface in hwgroup.
 559                  * Unlink us, and set hwgroup->drive and ->hwif to
 560                  * something sane.
 561                  */
 562                 g = hwgroup->hwif;
 563                 while (g->next != hwif)
 564                         g = g->next;
 565                 g->next = hwif->next;
 566                 if (hwgroup->hwif == hwif) {
 567                         /* Chose a random hwif for hwgroup->hwif.
 568                          * It's guaranteed that there are no drives
 569                          * left in the hwgroup.
 570                          */
 571                         BUG_ON(hwgroup->drive != NULL);
 572                         hwgroup->hwif = g;
 573                 }
 574                 BUG_ON(hwgroup->hwif == hwif);
 575         }
 576
 577         /* More messed up locking ... */
 578         spin_unlock_irq(&ide_lock);
 579         device_unregister(&hwif->gendev);
 580         wait_for_completion(&hwif->gendev_rel_comp);
 581
 582         /*
 583          * Remove us from the kernel's knowledge
 584          */
 585         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 586         kfree(hwif->sg_table);
 587         unregister_blkdev(hwif->major, hwif->name);
 588         spin_lock_irq(&ide_lock);
 589
 590         if (hwif->dma_base) {
 591                 (void) ide_release_dma(hwif);
 592
 593                 hwif->dma_base = 0;
 594                 hwif->dma_command = 0;
 595                 hwif->dma_vendor1 = 0;
 596                 hwif->dma_status = 0;
 597                 hwif->dma_vendor3 = 0;
 598                 hwif->dma_prdtable = 0;
 599
 600                 hwif->extra_base  = 0;
 601                 hwif->extra_ports = 0;
 602         }
 603
 604         /* copy original settings */
 605         tmp_hwif = *hwif;
 606
 607         /* restore hwif data to pristine status */
 608         ide_init_port_data(hwif, index);
 609         init_hwif_default(hwif, index);
 610
 611         ide_hwif_restore(hwif, &tmp_hwif);
 612
 613 abort:
 614         spin_unlock_irq(&ide_lock);
 615         mutex_unlock(&ide_cfg_mtx);
 616 }
 617
 618 EXPORT_SYMBOL(ide_unregister);
 619
 620
 621 /**
 622  *      ide_setup_ports         -       set up IDE interface ports
 623  *      @hw: register descriptions
 624  *      @base: base register
 625  *      @offsets: table of register offsets
 626  *      @ctrl: control register
 627  *      @ack_irq: IRQ ack
 628  *      @irq: interrupt lie
 629  *
 630  *      Setup hw_regs_t structure described by parameters.  You
 631  *      may set up the hw structure yourself OR use this routine to
 632  *      do it for you. This is basically a helper
 633  *
 634  */
 635
 636 void ide_setup_ports (  hw_regs_t *hw,
 637                         unsigned long base, int *offsets,
 638                         unsigned long ctrl, unsigned long intr,
 639                         ide_ack_intr_t *ack_intr,
 640 /*
 641  *                      ide_io_ops_t *iops,
 642  */
 643                         int irq)
 644 {
 645         int i;
 646
 647         memset(hw, 0, sizeof(hw_regs_t));
 648         for (i = 0; i < IDE_NR_PORTS; i++) {
 649                 if (offsets[i] == -1) {
 650                         switch(i) {
 651                                 case IDE_CONTROL_OFFSET:
 652                                         hw->io_ports[i] = ctrl;
 653                                         break;
 654 #if defined(CONFIG_AMIGA) || defined(CONFIG_MAC)
 655                                 case IDE_IRQ_OFFSET:
 656                                         hw->io_ports[i] = intr;
 657                                         break;
 658 #endif /* (CONFIG_AMIGA) || (CONFIG_MAC) */
 659                                 default:
 660                                         hw->io_ports[i] = 0;
 661                                         break;
 662                         }
 663                 } else {
 664                         hw->io_ports[i] = base + offsets[i];
 665                 }
 666         }
 667         hw->irq = irq;
 668         hw->ack_intr = ack_intr;
 669 /*
 670  *      hw->iops = iops;
 671  */
 672 }
 673
 674 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
 675 {
 676         memcpy(hwif->io_ports, hw->io_ports, sizeof(hwif->io_ports));
 677         hwif->irq = hw->irq;
 678         hwif->noprobe = 0;
 679         hwif->chipset = hw->chipset;
 680         hwif->gendev.parent = hw->dev;
 681         hwif->ack_intr = hw->ack_intr;
 682 }
 683 EXPORT_SYMBOL_GPL(ide_init_port_hw);
 684
 685 /**
 686  *      ide_register_hw         -       register IDE interface
 687  *      @hw: hardware registers
 688  *      @quirkproc: quirkproc function
 689  *      @hwifp: pointer to returned hwif
 690  *
 691  *      Register an IDE interface, specifying exactly the registers etc.
 692  *
 693  *      Returns -1 on error.
 694  */
 695
 696 int ide_register_hw(hw_regs_t *hw, void (*quirkproc)(ide_drive_t *),
 697                     ide_hwif_t **hwifp)
 698 {
 699         int index, retry = 1;
 700         ide_hwif_t *hwif;
 701         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
 702
 703         do {
 704                 for (index = 0; index < MAX_HWIFS; ++index) {
 705                         hwif = &ide_hwifs[index];
 706                         if (hwif->io_ports[IDE_DATA_OFFSET] == hw->io_ports[IDE_DATA_OFFSET])
 707                                 goto found;
 708                 }
 709                 for (index = 0; index < MAX_HWIFS; ++index) {
 710                         hwif = &ide_hwifs[index];
 711                         if (hwif->hold)
 712                                 continue;
 713                         if (!hwif->present && hwif->mate == NULL)
 714                                 goto found;
 715                 }
 716                 for (index = 0; index < MAX_HWIFS; index++)
 717                         ide_unregister(index);
 718         } while (retry--);
 719         return -1;
 720 found:
 721         if (hwif->present)
 722                 ide_unregister(index);
 723         else if (!hwif->hold) {
 724                 ide_init_port_data(hwif, index);
 725                 init_hwif_default(hwif, index);
 726         }
 727         if (hwif->present)
 728                 return -1;
 729
 730         ide_init_port_hw(hwif, hw);
 731         hwif->quirkproc = quirkproc;
 732
 733         idx[0] = index;
 734
 735         ide_device_add(idx);
 736
 737         if (hwifp)
 738                 *hwifp = hwif;
 739
 740         return hwif->present ? index : -1;
 741 }
 742
 743 EXPORT_SYMBOL(ide_register_hw);
 744
 745 /*
 746  *      Locks for IDE setting functionality
 747  */
 748
 749 DEFINE_MUTEX(ide_setting_mtx);
 750
 751 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 752
 753 /**
 754  *      ide_spin_wait_hwgroup   -       wait for group
 755  *      @drive: drive in the group
 756  *
 757  *      Wait for an IDE device group to go non busy and then return
 758  *      holding the ide_lock which guards the hwgroup->busy status
 759  *      and right to use it.
 760  */
 761
 762 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 763 {
 764         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 765         unsigned long timeout = jiffies + (3 * HZ);
 766
 767         spin_lock_irq(&ide_lock);
 768
 769         while (hwgroup->busy) {
 770                 unsigned long lflags;
 771                 spin_unlock_irq(&ide_lock);
 772                 local_irq_set(lflags);
 773                 if (time_after(jiffies, timeout)) {
 774                         local_irq_restore(lflags);
 775                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 776                         return -EBUSY;
 777                 }
 778                 local_irq_restore(lflags);
 779                 spin_lock_irq(&ide_lock);
 780         }
 781         return 0;
 782 }
 783
 784 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 785
 786 int set_io_32bit(ide_drive_t *drive, int arg)
 787 {
 788         if (drive->no_io_32bit)
 789                 return -EPERM;
 790
 791         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 792                 return -EINVAL;
 793
 794         if (ide_spin_wait_hwgroup(drive))
 795                 return -EBUSY;
 796
 797         drive->io_32bit = arg;
 798 #ifdef CONFIG_BLK_DEV_DTC2278
 799         if (HWIF(drive)->chipset == ide_dtc2278)
 800                 HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
 801 #endif /* CONFIG_BLK_DEV_DTC2278 */
 802
 803         spin_unlock_irq(&ide_lock);
 804
 805         return 0;
 806 }
 807
 808 static int set_ksettings(ide_drive_t *drive, int arg)
 809 {
 810         if (arg < 0 || arg > 1)
 811                 return -EINVAL;
 812
 813         if (ide_spin_wait_hwgroup(drive))
 814                 return -EBUSY;
 815         drive->keep_settings = arg;
 816         spin_unlock_irq(&ide_lock);
 817
 818         return 0;
 819 }
 820
 821 int set_using_dma(ide_drive_t *drive, int arg)
 822 {
 823 #ifdef CONFIG_BLK_DEV_IDEDMA
 824         ide_hwif_t *hwif = drive->hwif;
 825         int err = -EPERM;
 826
 827         if (arg < 0 || arg > 1)
 828                 return -EINVAL;
 829
 830         if (!drive->id || !(drive->id->capability & 1))
 831                 goto out;
 832
 833         if (hwif->dma_host_set == NULL)
 834                 goto out;
 835
 836         err = -EBUSY;
 837         if (ide_spin_wait_hwgroup(drive))
 838                 goto out;
 839         /*
 840          * set ->busy flag, unlock and let it ride
 841          */
 842         hwif->hwgroup->busy = 1;
 843         spin_unlock_irq(&ide_lock);
 844
 845         err = 0;
 846
 847         if (arg) {
 848                 if (ide_set_dma(drive))
 849                         err = -EIO;
 850         } else
 851                 ide_dma_off(drive);
 852
 853         /*
 854          * lock, clear ->busy flag and unlock before leaving
 855          */
 856         spin_lock_irq(&ide_lock);
 857         hwif->hwgroup->busy = 0;
 858         spin_unlock_irq(&ide_lock);
 859 out:
 860         return err;
 861 #else
 862         if (arg < 0 || arg > 1)
 863                 return -EINVAL;
 864
 865         return -EPERM;
 866 #endif
 867 }
 868
 869 int set_pio_mode(ide_drive_t *drive, int arg)
 870 {
 871         struct request rq;
 872
 873         if (arg < 0 || arg > 255)
 874                 return -EINVAL;
 875
 876         if (drive->hwif->set_pio_mode == NULL)
 877                 return -ENOSYS;
 878
 879         if (drive->special.b.set_tune)
 880                 return -EBUSY;
 881         ide_init_drive_cmd(&rq);
 882         drive->tune_req = (u8) arg;
 883         drive->special.b.set_tune = 1;
 884         (void) ide_do_drive_cmd(drive, &rq, ide_wait);
 885         return 0;
 886 }
 887
 888 static int set_unmaskirq(ide_drive_t *drive, int arg)
 889 {
 890         if (drive->no_unmask)
 891                 return -EPERM;
 892
 893         if (arg < 0 || arg > 1)
 894                 return -EINVAL;
 895
 896         if (ide_spin_wait_hwgroup(drive))
 897                 return -EBUSY;
 898         drive->unmask = arg;
 899         spin_unlock_irq(&ide_lock);
 900
 901         return 0;
 902 }
 903
 904 /**
 905  *      system_bus_clock        -       clock guess
 906  *
 907  *      External version of the bus clock guess used by very old IDE drivers
 908  *      for things like VLB timings. Should not be used.
 909  */
 910
 911 int system_bus_clock (void)
 912 {
 913         return((int) ((!system_bus_speed) ? ide_system_bus_speed() : system_bus_speed ));
 914 }
 915
 916 EXPORT_SYMBOL(system_bus_clock);
 917
 918 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 919 {
 920         ide_drive_t *drive = dev->driver_data;
 921         ide_hwif_t *hwif = HWIF(drive);
 922         struct request rq;
 923         struct request_pm_state rqpm;
 924         ide_task_t args;
 925         int ret;
 926
 927         /* Call ACPI _GTM only once */
 928         if (!(drive->dn % 2))
 929                 ide_acpi_get_timing(hwif);
 930
 931         memset(&rq, 0, sizeof(rq));
 932         memset(&rqpm, 0, sizeof(rqpm));
 933         memset(&args, 0, sizeof(args));
 934         rq.cmd_type = REQ_TYPE_PM_SUSPEND;
 935         rq.special = &args;
 936         rq.data = &rqpm;
 937         rqpm.pm_step = ide_pm_state_start_suspend;
 938         if (mesg.event == PM_EVENT_PRETHAW)
 939                 mesg.event = PM_EVENT_FREEZE;
 940         rqpm.pm_state = mesg.event;
 941
 942         ret = ide_do_drive_cmd(drive, &rq, ide_wait);
 943         /* only call ACPI _PS3 after both drivers are suspended */
 944         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 945                  && hwif->drives[1].present)
 946                  || !hwif->drives[0].present
 947                  || !hwif->drives[1].present))
 948                 ide_acpi_set_state(hwif, 0);
 949         return ret;
 950 }
 951
 952 static int generic_ide_resume(struct device *dev)
 953 {
 954         ide_drive_t *drive = dev->driver_data;
 955         ide_hwif_t *hwif = HWIF(drive);
 956         struct request rq;
 957         struct request_pm_state rqpm;
 958         ide_task_t args;
 959         int err;
 960
 961         /* Call ACPI _STM only once */
 962         if (!(drive->dn % 2)) {
 963                 ide_acpi_set_state(hwif, 1);
 964                 ide_acpi_push_timing(hwif);
 965         }
 966
 967         ide_acpi_exec_tfs(drive);
 968
 969         memset(&rq, 0, sizeof(rq));
 970         memset(&rqpm, 0, sizeof(rqpm));
 971         memset(&args, 0, sizeof(args));
 972         rq.cmd_type = REQ_TYPE_PM_RESUME;
 973         rq.special = &args;
 974         rq.data = &rqpm;
 975         rqpm.pm_step = ide_pm_state_start_resume;
 976         rqpm.pm_state = PM_EVENT_ON;
 977
 978         err = ide_do_drive_cmd(drive, &rq, ide_head_wait);
 979
 980         if (err == 0 && dev->driver) {
 981                 ide_driver_t *drv = to_ide_driver(dev->driver);
 982
 983                 if (drv->resume)
 984                         drv->resume(drive);
 985         }
 986
 987         return err;
 988 }
 989
 990 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 991                         unsigned int cmd, unsigned long arg)
 992 {
 993         unsigned long flags;
 994         ide_driver_t *drv;
 995         void __user *p = (void __user *)arg;
 996         int err = 0, (*setfunc)(ide_drive_t *, int);
 997         u8 *val;
 998
 999         switch (cmd) {
1000         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
1001         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
1002         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
1003         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
1004         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
1005         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
1006         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
1007         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
1008         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
1009         }
1010
1011         switch (cmd) {
1012                 case HDIO_OBSOLETE_IDENTITY:
1013                 case HDIO_GET_IDENTITY:
1014                         if (bdev != bdev->bd_contains)
1015                                 return -EINVAL;
1016                         if (drive->id_read == 0)
1017                                 return -ENOMSG;
1018                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
1019                                 return -EFAULT;
1020                         return 0;
1021
1022                 case HDIO_GET_NICE:
1023                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
1024                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
1025                                         drive->nice0            <<      IDE_NICE_0              |
1026                                         drive->nice1            <<      IDE_NICE_1              |
1027                                         drive->nice2            <<      IDE_NICE_2,
1028                                         (long __user *) arg);
1029
1030 #ifdef CONFIG_IDE_TASK_IOCTL
1031                 case HDIO_DRIVE_TASKFILE:
1032                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1033                                 return -EACCES;
1034                         switch(drive->media) {
1035                                 case ide_disk:
1036                                         return ide_taskfile_ioctl(drive, cmd, arg);
1037                                 default:
1038                                         return -ENOMSG;
1039                         }
1040 #endif /* CONFIG_IDE_TASK_IOCTL */
1041
1042                 case HDIO_DRIVE_CMD:
1043                         if (!capable(CAP_SYS_RAWIO))
1044                                 return -EACCES;
1045                         return ide_cmd_ioctl(drive, cmd, arg);
1046
1047                 case HDIO_DRIVE_TASK:
1048                         if (!capable(CAP_SYS_RAWIO))
1049                                 return -EACCES;
1050                         return ide_task_ioctl(drive, cmd, arg);
1051
1052                 case HDIO_SCAN_HWIF:
1053                 {
1054                         hw_regs_t hw;
1055                         int args[3];
1056                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1057                         if (copy_from_user(args, p, 3 * sizeof(int)))
1058                                 return -EFAULT;
1059                         memset(&hw, 0, sizeof(hw));
1060                         ide_init_hwif_ports(&hw, (unsigned long) args[0],
1061                                             (unsigned long) args[1], NULL);
1062                         hw.irq = args[2];
1063                         if (ide_register_hw(&hw, NULL, NULL) == -1)
1064                                 return -EIO;
1065                         return 0;
1066                 }
1067                 case HDIO_UNREGISTER_HWIF:
1068                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1069                         /* (arg > MAX_HWIFS) checked in function */
1070                         ide_unregister(arg);
1071                         return 0;
1072                 case HDIO_SET_NICE:
1073                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1074                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
1075                                 return -EPERM;
1076                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
1077                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
1078                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
1079                                 drive->dsc_overlap = 0;
1080                                 return -EPERM;
1081                         }
1082                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
1083                         return 0;
1084                 case HDIO_DRIVE_RESET:
1085                 {
1086                         unsigned long flags;
1087                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1088
1089                         /*
1090                          *      Abort the current command on the
1091                          *      group if there is one, taking
1092                          *      care not to allow anything else
1093                          *      to be queued and to die on the
1094                          *      spot if we miss one somehow
1095                          */
1096
1097                         spin_lock_irqsave(&ide_lock, flags);
1098
1099                         if (HWGROUP(drive)->resetting) {
1100                                 spin_unlock_irqrestore(&ide_lock, flags);
1101                                 return -EBUSY;
1102                         }
1103
1104                         ide_abort(drive, "drive reset");
1105
1106                         BUG_ON(HWGROUP(drive)->handler);
1107
1108                         /* Ensure nothing gets queued after we
1109                            drop the lock. Reset will clear the busy */
1110
1111                         HWGROUP(drive)->busy = 1;
1112                         spin_unlock_irqrestore(&ide_lock, flags);
1113                         (void) ide_do_reset(drive);
1114
1115                         return 0;
1116                 }
1117
1118                 case HDIO_GET_BUSSTATE:
1119                         if (!capable(CAP_SYS_ADMIN))
1120                                 return -EACCES;
1121                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
1122                                 return -EFAULT;
1123                         return 0;
1124
1125                 case HDIO_SET_BUSSTATE:
1126                         if (!capable(CAP_SYS_ADMIN))
1127                                 return -EACCES;
1128                         if (HWIF(drive)->busproc)
1129                                 return HWIF(drive)->busproc(drive, (int)arg);
1130                         return -EOPNOTSUPP;
1131                 default:
1132                         return -EINVAL;
1133         }
1134
1135 read_val:
1136         mutex_lock(&ide_setting_mtx);
1137         spin_lock_irqsave(&ide_lock, flags);
1138         err = *val;
1139         spin_unlock_irqrestore(&ide_lock, flags);
1140         mutex_unlock(&ide_setting_mtx);
1141         return err >= 0 ? put_user(err, (long __user *)arg) : err;
1142
1143 set_val:
1144         if (bdev != bdev->bd_contains)
1145                 err = -EINVAL;
1146         else {
1147                 if (!capable(CAP_SYS_ADMIN))
1148                         err = -EACCES;
1149                 else {
1150                         mutex_lock(&ide_setting_mtx);
1151                         err = setfunc(drive, arg);
1152                         mutex_unlock(&ide_setting_mtx);
1153                 }
1154         }
1155         return err;
1156 }
1157
1158 EXPORT_SYMBOL(generic_ide_ioctl);
1159
1160 /*
1161  * stridx() returns the offset of c within s,
1162  * or -1 if c is '\0' or not found within s.
1163  */
1164 static int __init stridx (const char *s, char c)
1165 {
1166         char *i = strchr(s, c);
1167         return (i && c) ? i - s : -1;
1168 }
1169
1170 /*
1171  * match_parm() does parsing for ide_setup():
1172  *
1173  * 1. the first char of s must be '='.
1174  * 2. if the remainder matches one of the supplied keywords,
1175  *     the index (1 based) of the keyword is negated and returned.
1176  * 3. if the remainder is a series of no more than max_vals numbers
1177  *     separated by commas, the numbers are saved in vals[] and a
1178  *     count of how many were saved is returned.  Base10 is assumed,
1179  *     and base16 is allowed when prefixed with "0x".
1180  * 4. otherwise, zero is returned.
1181  */
1182 static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
1183 {
1184         static const char *decimal = "0123456789";
1185         static const char *hex = "0123456789abcdef";
1186         int i, n;
1187
1188         if (*s++ == '=') {
1189                 /*
1190                  * Try matching against the supplied keywords,
1191                  * and return -(index+1) if we match one
1192                  */
1193                 if (keywords != NULL) {
1194                         for (i = 0; *keywords != NULL; ++i) {
1195                                 if (!strcmp(s, *keywords++))
1196                                         return -(i+1);
1197                         }
1198                 }
1199                 /*
1200                  * Look for a series of no more than "max_vals"
1201                  * numeric values separated by commas, in base10,
1202                  * or base16 when prefixed with "0x".
1203                  * Return a count of how many were found.
1204                  */
1205                 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
1206                         vals[n] = i;
1207                         while ((i = stridx(decimal, *++s)) >= 0)
1208                                 vals[n] = (vals[n] * 10) + i;
1209                         if (*s == 'x' && !vals[n]) {
1210                                 while ((i = stridx(hex, *++s)) >= 0)
1211                                         vals[n] = (vals[n] * 0x10) + i;
1212                         }
1213                         if (++n == max_vals)
1214                                 break;
1215                         if (*s == ',' || *s == ';')
1216                                 ++s;
1217                 }
1218                 if (!*s)
1219                         return n;
1220         }
1221         return 0;       /* zero = nothing matched */
1222 }
1223
1224 extern int probe_ali14xx;
1225 extern int probe_umc8672;
1226 extern int probe_dtc2278;
1227 extern int probe_ht6560b;
1228 extern int probe_qd65xx;
1229 extern int cmd640_vlb;
1230
1231 static int __initdata is_chipset_set[MAX_HWIFS];
1232
1233 /*
1234  * ide_setup() gets called VERY EARLY during initialization,
1235  * to handle kernel "command line" strings beginning with "hdx=" or "ide".
1236  *
1237  * Remember to update Documentation/ide.txt if you change something here.
1238  */
1239 static int __init ide_setup(char *s)
1240 {
1241         int i, vals[3];
1242         ide_hwif_t *hwif;
1243         ide_drive_t *drive;
1244         unsigned int hw, unit;
1245         const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
1246         const char max_hwif  = '0' + (MAX_HWIFS - 1);
1247
1248
1249         if (strncmp(s,"hd",2) == 0 && s[2] == '=')      /* hd= is for hd.c   */
1250                 return 0;                               /* driver and not us */
1251
1252         if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
1253                 return 0;
1254
1255         printk(KERN_INFO "ide_setup: %s", s);
1256         init_ide_data ();
1257
1258 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
1259         if (!strcmp(s, "ide=doubler")) {
1260                 extern int ide_doubler;
1261
1262                 printk(" : Enabled support for IDE doublers\n");
1263                 ide_doubler = 1;
1264                 return 1;
1265         }
1266 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
1267
1268         if (!strcmp(s, "ide=nodma")) {
1269                 printk(" : Prevented DMA\n");
1270                 noautodma = 1;
1271                 goto obsolete_option;
1272         }
1273
1274 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
1275         if (!strcmp(s, "ide=reverse")) {
1276                 ide_scan_direction = 1;
1277                 printk(" : Enabled support for IDE inverse scan order.\n");
1278                 return 1;
1279         }
1280 #endif
1281
1282 #ifdef CONFIG_BLK_DEV_IDEACPI
1283         if (!strcmp(s, "ide=noacpi")) {
1284                 //printk(" : Disable IDE ACPI support.\n");
1285                 ide_noacpi = 1;
1286                 return 1;
1287         }
1288         if (!strcmp(s, "ide=acpigtf")) {
1289                 //printk(" : Enable IDE ACPI _GTF support.\n");
1290                 ide_noacpitfs = 0;
1291                 return 1;
1292         }
1293         if (!strcmp(s, "ide=acpionboot")) {
1294                 //printk(" : Call IDE ACPI methods on boot.\n");
1295                 ide_noacpionboot = 0;
1296                 return 1;
1297         }
1298 #endif /* CONFIG_BLK_DEV_IDEACPI */
1299
1300         /*
1301          * Look for drive options:  "hdx="
1302          */
1303         if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
1304                 const char *hd_words[] = {
1305                         "none", "noprobe", "nowerr", "cdrom", "nodma",
1306                         "autotune", "noautotune", "minus8", "swapdata", "bswap",
1307                         "noflush", "remap", "remap63", "scsi", NULL };
1308                 unit = s[2] - 'a';
1309                 hw   = unit / MAX_DRIVES;
1310                 unit = unit % MAX_DRIVES;
1311                 hwif = &ide_hwifs[hw];
1312                 drive = &hwif->drives[unit];
1313                 if (strncmp(s + 4, "ide-", 4) == 0) {
1314                         strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
1315                         goto done;
1316                 }
1317                 switch (match_parm(&s[3], hd_words, vals, 3)) {
1318                         case -1: /* "none" */
1319                         case -2: /* "noprobe" */
1320                                 drive->noprobe = 1;
1321                                 goto done;
1322                         case -3: /* "nowerr" */
1323                                 drive->bad_wstat = BAD_R_STAT;
1324                                 hwif->noprobe = 0;
1325                                 goto done;
1326                         case -4: /* "cdrom" */
1327                                 drive->present = 1;
1328                                 drive->media = ide_cdrom;
1329                                 /* an ATAPI device ignores DRDY */
1330                                 drive->ready_stat = 0;
1331                                 hwif->noprobe = 0;
1332                                 goto done;
1333                         case -5: /* nodma */
1334                                 drive->nodma = 1;
1335                                 goto done;
1336                         case -6: /* "autotune" */
1337                                 drive->autotune = IDE_TUNE_AUTO;
1338                                 goto obsolete_option;
1339                         case -7: /* "noautotune" */
1340                                 drive->autotune = IDE_TUNE_NOAUTO;
1341                                 goto obsolete_option;
1342                         case -9: /* "swapdata" */
1343                         case -10: /* "bswap" */
1344                                 drive->bswap = 1;
1345                                 goto done;
1346                         case -11: /* noflush */
1347                                 drive->noflush = 1;
1348                                 goto done;
1349                         case -12: /* "remap" */
1350                                 drive->remap_0_to_1 = 1;
1351                                 goto done;
1352                         case -13: /* "remap63" */
1353                                 drive->sect0 = 63;
1354                                 goto done;
1355                         case -14: /* "scsi" */
1356                                 drive->scsi = 1;
1357                                 goto done;
1358                         case 3: /* cyl,head,sect */
1359                                 drive->media    = ide_disk;
1360                                 drive->ready_stat = READY_STAT;
1361                                 drive->cyl      = drive->bios_cyl  = vals[0];
1362                                 drive->head     = drive->bios_head = vals[1];
1363                                 drive->sect     = drive->bios_sect = vals[2];
1364                                 drive->present  = 1;
1365                                 drive->forced_geom = 1;
1366                                 hwif->noprobe = 0;
1367                                 goto done;
1368                         default:
1369                                 goto bad_option;
1370                 }
1371         }
1372
1373         if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
1374                 goto bad_option;
1375         /*
1376          * Look for bus speed option:  "idebus="
1377          */
1378         if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
1379                 if (match_parm(&s[6], NULL, vals, 1) != 1)
1380                         goto bad_option;
1381                 if (vals[0] >= 20 && vals[0] <= 66) {
1382                         idebus_parameter = vals[0];
1383                 } else
1384                         printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
1385                 goto done;
1386         }
1387         /*
1388          * Look for interface options:  "idex="
1389          */
1390         if (s[3] >= '0' && s[3] <= max_hwif) {
1391                 /*
1392                  * Be VERY CAREFUL changing this: note hardcoded indexes below
1393                  * (-8, -9, -10) are reserved to ease the hardcoding.
1394                  */
1395                 static const char *ide_words[] = {
1396                         "noprobe", "serialize", "minus3", "minus4",
1397                         "reset", "minus6", "ata66", "minus8", "minus9",
1398                         "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
1399                         "dtc2278", "umc8672", "ali14xx", NULL };
1400
1401                 hw_regs_t hwregs;
1402
1403                 hw = s[3] - '0';
1404                 hwif = &ide_hwifs[hw];
1405                 i = match_parm(&s[4], ide_words, vals, 3);
1406
1407                 /*
1408                  * Cryptic check to ensure chipset not already set for hwif.
1409                  * Note: we can't depend on hwif->chipset here.
1410                  */
1411                 if ((i >= -18 && i <= -11) || (i > 0 && i <= 3)) {
1412                         /* chipset already specified */
1413                         if (is_chipset_set[hw])
1414                                 goto bad_option;
1415                         if (i > -18 && i <= -11) {
1416                                 /* these drivers are for "ide0=" only */
1417                                 if (hw != 0)
1418                                         goto bad_hwif;
1419                                 /* chipset already specified for 2nd port */
1420                                 if (is_chipset_set[hw+1])
1421                                         goto bad_option;
1422                         }
1423                         is_chipset_set[hw] = 1;
1424                         printk("\n");
1425                 }
1426
1427                 switch (i) {
1428 #ifdef CONFIG_BLK_DEV_ALI14XX
1429                         case -17: /* "ali14xx" */
1430                                 probe_ali14xx = 1;
1431                                 goto done;
1432 #endif
1433 #ifdef CONFIG_BLK_DEV_UMC8672
1434                         case -16: /* "umc8672" */
1435                                 probe_umc8672 = 1;
1436                                 goto done;
1437 #endif
1438 #ifdef CONFIG_BLK_DEV_DTC2278
1439                         case -15: /* "dtc2278" */
1440                                 probe_dtc2278 = 1;
1441                                 goto done;
1442 #endif
1443 #ifdef CONFIG_BLK_DEV_CMD640
1444                         case -14: /* "cmd640_vlb" */
1445                                 cmd640_vlb = 1;
1446                                 goto done;
1447 #endif
1448 #ifdef CONFIG_BLK_DEV_HT6560B
1449                         case -13: /* "ht6560b" */
1450                                 probe_ht6560b = 1;
1451                                 goto done;
1452 #endif
1453 #ifdef CONFIG_BLK_DEV_QD65XX
1454                         case -12: /* "qd65xx" */
1455                                 probe_qd65xx = 1;
1456                                 goto done;
1457 #endif
1458 #ifdef CONFIG_BLK_DEV_4DRIVES
1459                         case -11: /* "four" drives on one set of ports */
1460                         {
1461                                 ide_hwif_t *mate = &ide_hwifs[hw^1];
1462                                 mate->drives[0].select.all ^= 0x20;
1463                                 mate->drives[1].select.all ^= 0x20;
1464                                 hwif->chipset = mate->chipset = ide_4drives;
1465                                 mate->irq = hwif->irq;
1466                                 memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
1467                                 hwif->mate = mate;
1468                                 mate->mate = hwif;
1469                                 hwif->serialized = mate->serialized = 1;
1470                                 goto obsolete_option;
1471                         }
1472 #endif /* CONFIG_BLK_DEV_4DRIVES */
1473                         case -10: /* minus10 */
1474                         case -9: /* minus9 */
1475                         case -8: /* minus8 */
1476                         case -6:
1477                         case -4:
1478                         case -3:
1479                                 goto bad_option;
1480                         case -7: /* ata66 */
1481 #ifdef CONFIG_BLK_DEV_IDEPCI
1482                                 /*
1483                                  * Use ATA_CBL_PATA40_SHORT so drive side
1484                                  * cable detection is also overriden.
1485                                  */
1486                                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1487                                 goto obsolete_option;
1488 #else
1489                                 goto bad_hwif;
1490 #endif
1491                         case -5: /* "reset" */
1492                                 hwif->reset = 1;
1493                                 goto obsolete_option;
1494                         case -2: /* "serialize" */
1495                                 hwif->mate = &ide_hwifs[hw^1];
1496                                 hwif->mate->mate = hwif;
1497                                 hwif->serialized = hwif->mate->serialized = 1;
1498                                 goto obsolete_option;
1499
1500                         case -1: /* "noprobe" */
1501                                 hwif->noprobe = 1;
1502                                 goto done;
1503
1504                         case 1: /* base */
1505                                 vals[1] = vals[0] + 0x206; /* default ctl */
1506                         case 2: /* base,ctl */
1507                                 vals[2] = 0;    /* default irq = probe for it */
1508                         case 3: /* base,ctl,irq */
1509                                 memset(&hwregs, 0, sizeof(hwregs));
1510                                 ide_init_hwif_ports(&hwregs, vals[0], vals[1], &hwif->irq);
1511                                 memcpy(hwif->io_ports, hwregs.io_ports, sizeof(hwif->io_ports));
1512                                 hwif->irq      = vals[2];
1513                                 hwif->noprobe  = 0;
1514                                 hwif->chipset  = ide_forced;
1515                                 goto obsolete_option;
1516
1517                         case 0: goto bad_option;
1518                         default:
1519                                 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
1520                                 return 1;
1521                 }
1522         }
1523 bad_option:
1524         printk(" -- BAD OPTION\n");
1525         return 1;
1526 obsolete_option:
1527         printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
1528         return 1;
1529 bad_hwif:
1530         printk("-- NOT SUPPORTED ON ide%d", hw);
1531 done:
1532         printk("\n");
1533         return 1;
1534 }
1535
1536 EXPORT_SYMBOL(ide_lock);
1537
1538 static int ide_bus_match(struct device *dev, struct device_driver *drv)
1539 {
1540         return 1;
1541 }
1542
1543 static char *media_string(ide_drive_t *drive)
1544 {
1545         switch (drive->media) {
1546         case ide_disk:
1547                 return "disk";
1548         case ide_cdrom:
1549                 return "cdrom";
1550         case ide_tape:
1551                 return "tape";
1552         case ide_floppy:
1553                 return "floppy";
1554         case ide_optical:
1555                 return "optical";
1556         default:
1557                 return "UNKNOWN";
1558         }
1559 }
1560
1561 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
1562 {
1563         ide_drive_t *drive = to_ide_device(dev);
1564         return sprintf(buf, "%s\n", media_string(drive));
1565 }
1566
1567 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
1568 {
1569         ide_drive_t *drive = to_ide_device(dev);
1570         return sprintf(buf, "%s\n", drive->name);
1571 }
1572
1573 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1574 {
1575         ide_drive_t *drive = to_ide_device(dev);
1576         return sprintf(buf, "ide:m-%s\n", media_string(drive));
1577 }
1578
1579 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
1580                           char *buf)
1581 {
1582         ide_drive_t *drive = to_ide_device(dev);
1583         return sprintf(buf, "%s\n", drive->id->model);
1584 }
1585
1586 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
1587                              char *buf)
1588 {
1589         ide_drive_t *drive = to_ide_device(dev);
1590         return sprintf(buf, "%s\n", drive->id->fw_rev);
1591 }
1592
1593 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
1594                            char *buf)
1595 {
1596         ide_drive_t *drive = to_ide_device(dev);
1597         return sprintf(buf, "%s\n", drive->id->serial_no);
1598 }
1599
1600 static struct device_attribute ide_dev_attrs[] = {
1601         __ATTR_RO(media),
1602         __ATTR_RO(drivename),
1603         __ATTR_RO(modalias),
1604         __ATTR_RO(model),
1605         __ATTR_RO(firmware),
1606         __ATTR(serial, 0400, serial_show, NULL),
1607         __ATTR_NULL
1608 };
1609
1610 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
1611 {
1612         ide_drive_t *drive = to_ide_device(dev);
1613
1614         add_uevent_var(env, "MEDIA=%s", media_string(drive));
1615         add_uevent_var(env, "DRIVENAME=%s", drive->name);
1616         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
1617         return 0;
1618 }
1619
1620 static int generic_ide_probe(struct device *dev)
1621 {
1622         ide_drive_t *drive = to_ide_device(dev);
1623         ide_driver_t *drv = to_ide_driver(dev->driver);
1624
1625         return drv->probe ? drv->probe(drive) : -ENODEV;
1626 }
1627
1628 static int generic_ide_remove(struct device *dev)
1629 {
1630         ide_drive_t *drive = to_ide_device(dev);
1631         ide_driver_t *drv = to_ide_driver(dev->driver);
1632
1633         if (drv->remove)
1634                 drv->remove(drive);
1635
1636         return 0;
1637 }
1638
1639 static void generic_ide_shutdown(struct device *dev)
1640 {
1641         ide_drive_t *drive = to_ide_device(dev);
1642         ide_driver_t *drv = to_ide_driver(dev->driver);
1643
1644         if (dev->driver && drv->shutdown)
1645                 drv->shutdown(drive);
1646 }
1647
1648 struct bus_type ide_bus_type = {
1649         .name           = "ide",
1650         .match          = ide_bus_match,
1651         .uevent         = ide_uevent,
1652         .probe          = generic_ide_probe,
1653         .remove         = generic_ide_remove,
1654         .shutdown       = generic_ide_shutdown,
1655         .dev_attrs      = ide_dev_attrs,
1656         .suspend        = generic_ide_suspend,
1657         .resume         = generic_ide_resume,
1658 };
1659
1660 EXPORT_SYMBOL_GPL(ide_bus_type);
1661
1662 /*
1663  * This is gets invoked once during initialization, to set *everything* up
1664  */
1665 static int __init ide_init(void)
1666 {
1667         int ret;
1668
1669         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver " REVISION "\n");
1670         system_bus_speed = ide_system_bus_speed();
1671
1672         ret = bus_register(&ide_bus_type);
1673         if (ret < 0) {
1674                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1675                 return ret;
1676         }
1677
1678         init_ide_data();
1679
1680         proc_ide_create();
1681
1682         return 0;
1683 }
1684
1685 #ifdef MODULE
1686 static char *options = NULL;
1687 module_param(options, charp, 0);
1688 MODULE_LICENSE("GPL");
1689
1690 static void __init parse_options (char *line)
1691 {
1692         char *next = line;
1693
1694         if (line == NULL || !*line)
1695                 return;
1696         while ((line = next) != NULL) {
1697                 if ((next = strchr(line,' ')) != NULL)
1698                         *next++ = 0;
1699                 if (!ide_setup(line))
1700                         printk (KERN_INFO "Unknown option '%s'\n", line);
1701         }
1702 }
1703
1704 int __init init_module (void)
1705 {
1706         parse_options(options);
1707         return ide_init();
1708 }
1709
1710 void __exit cleanup_module (void)
1711 {
1712         int index;
1713
1714         for (index = 0; index < MAX_HWIFS; ++index)
1715                 ide_unregister(index);
1716
1717         proc_ide_destroy();
1718
1719         bus_unregister(&ide_bus_type);
1720 }
1721
1722 #else /* !MODULE */
1723
1724 __setup("", ide_setup);
1725
1726 module_init(ide_init);
1727
1728 #endif /* MODULE */