SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/ide/ide.c

   1 /*
   2  *  Copyright (C) 1994-1998         Linus Torvalds & authors (see below)
   3  *  Copyrifht (C) 2003-2005, 2007   Bartlomiej Zolnierkiewicz
   4  */
   5
   6 /*
   7  *  Mostly written by Mark Lord  <mlord@pobox.com>
   8  *                and Gadi Oxman <gadio@netvision.net.il>
   9  *                and Andre Hedrick <andre@linux-ide.org>
  10  *
  11  *  See linux/MAINTAINERS for address of current maintainer.
  12  *
  13  * This is the multiple IDE interface driver, as evolved from hd.c.
  14  * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
  15  *   (usually 14 & 15).
  16  * There can be up to two drives per interface, as per the ATA-2 spec.
  17  *
  18  * ...
  19  *
  20  *  From hd.c:
  21  *  |
  22  *  | It traverses the request-list, using interrupts to jump between functions.
  23  *  | As nearly all functions can be called within interrupts, we may not sleep.
  24  *  | Special care is recommended.  Have Fun!
  25  *  |
  26  *  | modified by Drew Eckhardt to check nr of hd's from the CMOS.
  27  *  |
  28  *  | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
  29  *  | in the early extended-partition checks and added DM partitions.
  30  *  |
  31  *  | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
  32  *  |
  33  *  | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
  34  *  | and general streamlining by Mark Lord (mlord@pobox.com).
  35  *
  36  *  October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
  37  *
  38  *      Mark Lord       (mlord@pobox.com)               (IDE Perf.Pkg)
  39  *      Delman Lee      (delman@ieee.org)               ("Mr. atdisk2")
  40  *      Scott Snyder    (snyder@fnald0.fnal.gov)        (ATAPI IDE cd-rom)
  41  *
  42  *  This was a rewrite of just about everything from hd.c, though some original
  43  *  code is still sprinkled about.  Think of it as a major evolution, with
  44  *  inspiration from lots of linux users, esp.  hamish@zot.apana.org.au
  45  */
  46
  47 #define REVISION        "Revision: 7.00alpha2"
  48
  49 #define _IDE_C                  /* Tell ide.h it's really us */
  50
  51 #include <linux/module.h>
  52 #include <linux/types.h>
  53 #include <linux/string.h>
  54 #include <linux/kernel.h>
  55 #include <linux/timer.h>
  56 #include <linux/mm.h>
  57 #include <linux/interrupt.h>
  58 #include <linux/major.h>
  59 #include <linux/errno.h>
  60 #include <linux/genhd.h>
  61 #include <linux/blkpg.h>
  62 #include <linux/slab.h>
  63 #include <linux/init.h>
  64 #include <linux/pci.h>
  65 #include <linux/delay.h>
  66 #include <linux/ide.h>
  67 #include <linux/completion.h>
  68 #include <linux/reboot.h>
  69 #include <linux/cdrom.h>
  70 #include <linux/seq_file.h>
  71 #include <linux/device.h>
  72 #include <linux/bitops.h>
  73
  74 #include <asm/byteorder.h>
  75 #include <asm/irq.h>
  76 #include <asm/uaccess.h>
  77 #include <asm/io.h>
  78
  79
  80 /* default maximum number of failures */
  81 #define IDE_DEFAULT_MAX_FAILURES        1
  82
  83 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
  84                                         IDE2_MAJOR, IDE3_MAJOR,
  85                                         IDE4_MAJOR, IDE5_MAJOR,
  86                                         IDE6_MAJOR, IDE7_MAJOR,
  87                                         IDE8_MAJOR, IDE9_MAJOR };
  88
  89 static int idebus_parameter;    /* holds the "idebus=" parameter */
  90 static int system_bus_speed;    /* holds what we think is VESA/PCI bus speed */
  91
  92 DEFINE_MUTEX(ide_cfg_mtx);
  93  __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
  94
  95 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
  96 int ide_scan_direction; /* THIS was formerly 2.2.x pci=reverse */
  97 #endif
  98
  99 int noautodma = 0;
 100
 101 #ifdef CONFIG_BLK_DEV_IDEACPI
 102 int ide_noacpi = 0;
 103 int ide_noacpitfs = 1;
 104 int ide_noacpionboot = 1;
 105 #endif
 106
 107 /*
 108  * This is declared extern in ide.h, for access by other IDE modules:
 109  */
 110 ide_hwif_t ide_hwifs[MAX_HWIFS];        /* master data repository */
 111
 112 EXPORT_SYMBOL(ide_hwifs);
 113
 114 /*
 115  * Do not even *think* about calling this!
 116  */
 117 void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
 118 {
 119         unsigned int unit;
 120
 121         /* bulk initialize hwif & drive info with zeros */
 122         memset(hwif, 0, sizeof(ide_hwif_t));
 123
 124         /* fill in any non-zero initial values */
 125         hwif->index     = index;
 126         hwif->major     = ide_hwif_to_major[index];
 127
 128         hwif->name[0]   = 'i';
 129         hwif->name[1]   = 'd';
 130         hwif->name[2]   = 'e';
 131         hwif->name[3]   = '0' + index;
 132
 133         hwif->bus_state = BUSSTATE_ON;
 134
 135         init_completion(&hwif->gendev_rel_comp);
 136
 137         default_hwif_iops(hwif);
 138         default_hwif_transport(hwif);
 139         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 140                 ide_drive_t *drive = &hwif->drives[unit];
 141
 142                 drive->media                    = ide_disk;
 143                 drive->select.all               = (unit<<4)|0xa0;
 144                 drive->hwif                     = hwif;
 145                 drive->ctl                      = 0x08;
 146                 drive->ready_stat               = READY_STAT;
 147                 drive->bad_wstat                = BAD_W_STAT;
 148                 drive->special.b.recalibrate    = 1;
 149                 drive->special.b.set_geometry   = 1;
 150                 drive->name[0]                  = 'h';
 151                 drive->name[1]                  = 'd';
 152                 drive->name[2]                  = 'a' + (index * MAX_DRIVES) + unit;
 153                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
 154                 drive->using_dma                = 0;
 155                 drive->vdma                     = 0;
 156                 INIT_LIST_HEAD(&drive->list);
 157                 init_completion(&drive->gendev_rel_comp);
 158         }
 159 }
 160 EXPORT_SYMBOL_GPL(ide_init_port_data);
 161
 162 static void init_hwif_default(ide_hwif_t *hwif, unsigned int index)
 163 {
 164         hw_regs_t hw;
 165
 166         memset(&hw, 0, sizeof(hw_regs_t));
 167
 168         ide_init_hwif_ports(&hw, ide_default_io_base(index), 0, &hwif->irq);
 169
 170         memcpy(hwif->io_ports, hw.io_ports, sizeof(hw.io_ports));
 171
 172         hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
 173 #ifdef CONFIG_BLK_DEV_HD
 174         if (hwif->io_ports[IDE_DATA_OFFSET] == HD_DATA)
 175                 hwif->noprobe = 1;      /* may be overridden by ide_setup() */
 176 #endif
 177 }
 178
 179 /*
 180  * init_ide_data() sets reasonable default values into all fields
 181  * of all instances of the hwifs and drives, but only on the first call.
 182  * Subsequent calls have no effect (they don't wipe out anything).
 183  *
 184  * This routine is normally called at driver initialization time,
 185  * but may also be called MUCH earlier during kernel "command-line"
 186  * parameter processing.  As such, we cannot depend on any other parts
 187  * of the kernel (such as memory allocation) to be functioning yet.
 188  *
 189  * This is too bad, as otherwise we could dynamically allocate the
 190  * ide_drive_t structs as needed, rather than always consuming memory
 191  * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
 192  *
 193  * FIXME: We should stuff the setup data into __init and copy the
 194  * relevant hwifs/allocate them properly during boot.
 195  */
 196 #define MAGIC_COOKIE 0x12345678
 197 static void __init init_ide_data (void)
 198 {
 199         ide_hwif_t *hwif;
 200         unsigned int index;
 201         static unsigned long magic_cookie = MAGIC_COOKIE;
 202
 203         if (magic_cookie != MAGIC_COOKIE)
 204                 return;         /* already initialized */
 205         magic_cookie = 0;
 206
 207         /* Initialise all interface structures */
 208         for (index = 0; index < MAX_HWIFS; ++index) {
 209                 hwif = &ide_hwifs[index];
 210                 ide_init_port_data(hwif, index);
 211                 init_hwif_default(hwif, index);
 212 #if !defined(CONFIG_PPC32) || !defined(CONFIG_PCI)
 213                 hwif->irq =
 214                         ide_init_default_irq(hwif->io_ports[IDE_DATA_OFFSET]);
 215 #endif
 216         }
 217 }
 218
 219 /**
 220  *      ide_system_bus_speed    -       guess bus speed
 221  *
 222  *      ide_system_bus_speed() returns what we think is the system VESA/PCI
 223  *      bus speed (in MHz). This is used for calculating interface PIO timings.
 224  *      The default is 40 for known PCI systems, 50 otherwise.
 225  *      The "idebus=xx" parameter can be used to override this value.
 226  *      The actual value to be used is computed/displayed the first time
 227  *      through. Drivers should only use this as a last resort.
 228  *
 229  *      Returns a guessed speed in MHz.
 230  */
 231
 232 static int ide_system_bus_speed(void)
 233 {
 234 #ifdef CONFIG_PCI
 235         static struct pci_device_id pci_default[] = {
 236                 { PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID) },
 237                 { }
 238         };
 239 #else
 240 #define pci_default 0
 241 #endif /* CONFIG_PCI */
 242
 243         if (!system_bus_speed) {
 244                 if (idebus_parameter) {
 245                         /* user supplied value */
 246                         system_bus_speed = idebus_parameter;
 247                 } else if (pci_dev_present(pci_default)) {
 248                         /* safe default value for PCI */
 249                         system_bus_speed = 33;
 250                 } else {
 251                         /* safe default value for VESA and PCI */
 252                         system_bus_speed = 50;
 253                 }
 254                 printk(KERN_INFO "ide: Assuming %dMHz system bus speed "
 255                         "for PIO modes%s\n", system_bus_speed,
 256                         idebus_parameter ? "" : "; override with idebus=xx");
 257         }
 258         return system_bus_speed;
 259 }
 260
 261 ide_hwif_t * ide_find_port(unsigned long base)
 262 {
 263         ide_hwif_t *hwif;
 264         int i;
 265
 266         for (i = 0; i < MAX_HWIFS; i++) {
 267                 hwif = &ide_hwifs[i];
 268                 if (hwif->io_ports[IDE_DATA_OFFSET] == base)
 269                         goto found;
 270         }
 271
 272         for (i = 0; i < MAX_HWIFS; i++) {
 273                 hwif = &ide_hwifs[i];
 274                 if (hwif->io_ports[IDE_DATA_OFFSET] == 0)
 275                         goto found;
 276         }
 277
 278         hwif = NULL;
 279 found:
 280         return hwif;
 281 }
 282
 283 EXPORT_SYMBOL_GPL(ide_find_port);
 284
 285 static struct resource* hwif_request_region(ide_hwif_t *hwif,
 286                                             unsigned long addr, int num)
 287 {
 288         struct resource *res = request_region(addr, num, hwif->name);
 289
 290         if (!res)
 291                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
 292                                 hwif->name, addr, addr+num-1);
 293         return res;
 294 }
 295
 296 /**
 297  *      ide_hwif_request_regions - request resources for IDE
 298  *      @hwif: interface to use
 299  *
 300  *      Requests all the needed resources for an interface.
 301  *      Right now core IDE code does this work which is deeply wrong.
 302  *      MMIO leaves it to the controller driver,
 303  *      PIO will migrate this way over time.
 304  */
 305
 306 int ide_hwif_request_regions(ide_hwif_t *hwif)
 307 {
 308         unsigned long addr;
 309         unsigned int i;
 310
 311         if (hwif->mmio)
 312                 return 0;
 313         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 314         if (addr && !hwif_request_region(hwif, addr, 1))
 315                 goto control_region_busy;
 316         hwif->straight8 = 0;
 317         addr = hwif->io_ports[IDE_DATA_OFFSET];
 318         if ((addr | 7) == hwif->io_ports[IDE_STATUS_OFFSET]) {
 319                 if (!hwif_request_region(hwif, addr, 8))
 320                         goto data_region_busy;
 321                 hwif->straight8 = 1;
 322                 return 0;
 323         }
 324         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
 325                 addr = hwif->io_ports[i];
 326                 if (!hwif_request_region(hwif, addr, 1)) {
 327                         while (--i)
 328                                 release_region(addr, 1);
 329                         goto data_region_busy;
 330                 }
 331         }
 332         return 0;
 333
 334 data_region_busy:
 335         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 336         if (addr)
 337                 release_region(addr, 1);
 338 control_region_busy:
 339         /* If any errors are return, we drop the hwif interface. */
 340         return -EBUSY;
 341 }
 342
 343 /**
 344  *      ide_hwif_release_regions - free IDE resources
 345  *
 346  *      Note that we only release the standard ports,
 347  *      and do not even try to handle any extra ports
 348  *      allocated for weird IDE interface chipsets.
 349  *
 350  *      Note also that we don't yet handle mmio resources here. More
 351  *      importantly our caller should be doing this so we need to
 352  *      restructure this as a helper function for drivers.
 353  */
 354
 355 void ide_hwif_release_regions(ide_hwif_t *hwif)
 356 {
 357         u32 i = 0;
 358
 359         if (hwif->mmio)
 360                 return;
 361         if (hwif->io_ports[IDE_CONTROL_OFFSET])
 362                 release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
 363         if (hwif->straight8) {
 364                 release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
 365                 return;
 366         }
 367         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
 368                 if (hwif->io_ports[i])
 369                         release_region(hwif->io_ports[i], 1);
 370 }
 371
 372 /**
 373  *      ide_hwif_restore        -       restore hwif to template
 374  *      @hwif: hwif to update
 375  *      @tmp_hwif: template
 376  *
 377  *      Restore hwif to a previous state by copying most settings
 378  *      from the template.
 379  */
 380
 381 static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
 382 {
 383         hwif->hwgroup                   = tmp_hwif->hwgroup;
 384
 385         hwif->gendev.parent             = tmp_hwif->gendev.parent;
 386
 387         hwif->proc                      = tmp_hwif->proc;
 388
 389         hwif->major                     = tmp_hwif->major;
 390         hwif->straight8                 = tmp_hwif->straight8;
 391         hwif->bus_state                 = tmp_hwif->bus_state;
 392
 393         hwif->host_flags                = tmp_hwif->host_flags;
 394
 395         hwif->pio_mask                  = tmp_hwif->pio_mask;
 396
 397         hwif->ultra_mask                = tmp_hwif->ultra_mask;
 398         hwif->mwdma_mask                = tmp_hwif->mwdma_mask;
 399         hwif->swdma_mask                = tmp_hwif->swdma_mask;
 400
 401         hwif->cbl                       = tmp_hwif->cbl;
 402
 403         hwif->chipset                   = tmp_hwif->chipset;
 404         hwif->hold                      = tmp_hwif->hold;
 405
 406         hwif->dev                       = tmp_hwif->dev;
 407
 408 #ifdef CONFIG_BLK_DEV_IDEPCI
 409         hwif->cds                       = tmp_hwif->cds;
 410 #endif
 411
 412         hwif->set_pio_mode              = tmp_hwif->set_pio_mode;
 413         hwif->set_dma_mode              = tmp_hwif->set_dma_mode;
 414         hwif->mdma_filter               = tmp_hwif->mdma_filter;
 415         hwif->udma_filter               = tmp_hwif->udma_filter;
 416         hwif->selectproc                = tmp_hwif->selectproc;
 417         hwif->reset_poll                = tmp_hwif->reset_poll;
 418         hwif->pre_reset                 = tmp_hwif->pre_reset;
 419         hwif->resetproc                 = tmp_hwif->resetproc;
 420         hwif->maskproc                  = tmp_hwif->maskproc;
 421         hwif->quirkproc                 = tmp_hwif->quirkproc;
 422         hwif->busproc                   = tmp_hwif->busproc;
 423
 424         hwif->ata_input_data            = tmp_hwif->ata_input_data;
 425         hwif->ata_output_data           = tmp_hwif->ata_output_data;
 426         hwif->atapi_input_bytes         = tmp_hwif->atapi_input_bytes;
 427         hwif->atapi_output_bytes        = tmp_hwif->atapi_output_bytes;
 428
 429         hwif->dma_host_set              = tmp_hwif->dma_host_set;
 430         hwif->dma_setup                 = tmp_hwif->dma_setup;
 431         hwif->dma_exec_cmd              = tmp_hwif->dma_exec_cmd;
 432         hwif->dma_start                 = tmp_hwif->dma_start;
 433         hwif->ide_dma_end               = tmp_hwif->ide_dma_end;
 434         hwif->ide_dma_test_irq          = tmp_hwif->ide_dma_test_irq;
 435         hwif->ide_dma_clear_irq         = tmp_hwif->ide_dma_clear_irq;
 436         hwif->dma_lost_irq              = tmp_hwif->dma_lost_irq;
 437         hwif->dma_timeout               = tmp_hwif->dma_timeout;
 438
 439         hwif->OUTB                      = tmp_hwif->OUTB;
 440         hwif->OUTBSYNC                  = tmp_hwif->OUTBSYNC;
 441         hwif->OUTW                      = tmp_hwif->OUTW;
 442         hwif->OUTSW                     = tmp_hwif->OUTSW;
 443         hwif->OUTSL                     = tmp_hwif->OUTSL;
 444
 445         hwif->INB                       = tmp_hwif->INB;
 446         hwif->INW                       = tmp_hwif->INW;
 447         hwif->INSW                      = tmp_hwif->INSW;
 448         hwif->INSL                      = tmp_hwif->INSL;
 449
 450         hwif->sg_max_nents              = tmp_hwif->sg_max_nents;
 451
 452         hwif->mmio                      = tmp_hwif->mmio;
 453         hwif->rqsize                    = tmp_hwif->rqsize;
 454
 455 #ifndef CONFIG_BLK_DEV_IDECS
 456         hwif->irq                       = tmp_hwif->irq;
 457 #endif
 458
 459         hwif->dma_base                  = tmp_hwif->dma_base;
 460         hwif->dma_command               = tmp_hwif->dma_command;
 461         hwif->dma_vendor1               = tmp_hwif->dma_vendor1;
 462         hwif->dma_status                = tmp_hwif->dma_status;
 463         hwif->dma_vendor3               = tmp_hwif->dma_vendor3;
 464         hwif->dma_prdtable              = tmp_hwif->dma_prdtable;
 465
 466         hwif->config_data               = tmp_hwif->config_data;
 467         hwif->select_data               = tmp_hwif->select_data;
 468         hwif->extra_base                = tmp_hwif->extra_base;
 469         hwif->extra_ports               = tmp_hwif->extra_ports;
 470
 471         hwif->hwif_data                 = tmp_hwif->hwif_data;
 472 }
 473
 474 /**
 475  *      ide_unregister          -       free an IDE interface
 476  *      @index: index of interface (will change soon to a pointer)
 477  *
 478  *      Perform the final unregister of an IDE interface. At the moment
 479  *      we don't refcount interfaces so this will also get split up.
 480  *
 481  *      Locking:
 482  *      The caller must not hold the IDE locks
 483  *      The drive present/vanishing is not yet properly locked
 484  *      Take care with the callbacks. These have been split to avoid
 485  *      deadlocking the IDE layer. The shutdown callback is called
 486  *      before we take the lock and free resources. It is up to the
 487  *      caller to be sure there is no pending I/O here, and that
 488  *      the interface will not be reopened (present/vanishing locking
 489  *      isn't yet done BTW). After we commit to the final kill we
 490  *      call the cleanup callback with the ide locks held.
 491  *
 492  *      Unregister restores the hwif structures to the default state.
 493  *      This is raving bonkers.
 494  */
 495
 496 void ide_unregister(unsigned int index)
 497 {
 498         ide_drive_t *drive;
 499         ide_hwif_t *hwif, *g;
 500         static ide_hwif_t tmp_hwif; /* protected by ide_cfg_mtx */
 501         ide_hwgroup_t *hwgroup;
 502         int irq_count = 0, unit;
 503
 504         BUG_ON(index >= MAX_HWIFS);
 505
 506         BUG_ON(in_interrupt());
 507         BUG_ON(irqs_disabled());
 508         mutex_lock(&ide_cfg_mtx);
 509         spin_lock_irq(&ide_lock);
 510         hwif = &ide_hwifs[index];
 511         if (!hwif->present)
 512                 goto abort;
 513         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 514                 drive = &hwif->drives[unit];
 515                 if (!drive->present)
 516                         continue;
 517                 spin_unlock_irq(&ide_lock);
 518                 device_unregister(&drive->gendev);
 519                 wait_for_completion(&drive->gendev_rel_comp);
 520                 spin_lock_irq(&ide_lock);
 521         }
 522         hwif->present = 0;
 523
 524         spin_unlock_irq(&ide_lock);
 525
 526         ide_proc_unregister_port(hwif);
 527
 528         hwgroup = hwif->hwgroup;
 529         /*
 530          * free the irq if we were the only hwif using it
 531          */
 532         g = hwgroup->hwif;
 533         do {
 534                 if (g->irq == hwif->irq)
 535                         ++irq_count;
 536                 g = g->next;
 537         } while (g != hwgroup->hwif);
 538         if (irq_count == 1)
 539                 free_irq(hwif->irq, hwgroup);
 540
 541         spin_lock_irq(&ide_lock);
 542         /*
 543          * Note that we only release the standard ports,
 544          * and do not even try to handle any extra ports
 545          * allocated for weird IDE interface chipsets.
 546          */
 547         ide_hwif_release_regions(hwif);
 548
 549         /*
 550          * Remove us from the hwgroup, and free
 551          * the hwgroup if we were the only member
 552          */
 553         if (hwif->next == hwif) {
 554                 BUG_ON(hwgroup->hwif != hwif);
 555                 kfree(hwgroup);
 556         } else {
 557                 /* There is another interface in hwgroup.
 558                  * Unlink us, and set hwgroup->drive and ->hwif to
 559                  * something sane.
 560                  */
 561                 g = hwgroup->hwif;
 562                 while (g->next != hwif)
 563                         g = g->next;
 564                 g->next = hwif->next;
 565                 if (hwgroup->hwif == hwif) {
 566                         /* Chose a random hwif for hwgroup->hwif.
 567                          * It's guaranteed that there are no drives
 568                          * left in the hwgroup.
 569                          */
 570                         BUG_ON(hwgroup->drive != NULL);
 571                         hwgroup->hwif = g;
 572                 }
 573                 BUG_ON(hwgroup->hwif == hwif);
 574         }
 575
 576         /* More messed up locking ... */
 577         spin_unlock_irq(&ide_lock);
 578         device_unregister(&hwif->gendev);
 579         wait_for_completion(&hwif->gendev_rel_comp);
 580
 581         /*
 582          * Remove us from the kernel's knowledge
 583          */
 584         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 585         kfree(hwif->sg_table);
 586         unregister_blkdev(hwif->major, hwif->name);
 587         spin_lock_irq(&ide_lock);
 588
 589         if (hwif->dma_base) {
 590                 (void) ide_release_dma(hwif);
 591
 592                 hwif->dma_base = 0;
 593                 hwif->dma_command = 0;
 594                 hwif->dma_vendor1 = 0;
 595                 hwif->dma_status = 0;
 596                 hwif->dma_vendor3 = 0;
 597                 hwif->dma_prdtable = 0;
 598
 599                 hwif->extra_base  = 0;
 600                 hwif->extra_ports = 0;
 601         }
 602
 603         /* copy original settings */
 604         tmp_hwif = *hwif;
 605
 606         /* restore hwif data to pristine status */
 607         ide_init_port_data(hwif, index);
 608         init_hwif_default(hwif, index);
 609
 610         ide_hwif_restore(hwif, &tmp_hwif);
 611
 612 abort:
 613         spin_unlock_irq(&ide_lock);
 614         mutex_unlock(&ide_cfg_mtx);
 615 }
 616
 617 EXPORT_SYMBOL(ide_unregister);
 618
 619
 620 /**
 621  *      ide_setup_ports         -       set up IDE interface ports
 622  *      @hw: register descriptions
 623  *      @base: base register
 624  *      @offsets: table of register offsets
 625  *      @ctrl: control register
 626  *      @ack_irq: IRQ ack
 627  *      @irq: interrupt lie
 628  *
 629  *      Setup hw_regs_t structure described by parameters.  You
 630  *      may set up the hw structure yourself OR use this routine to
 631  *      do it for you. This is basically a helper
 632  *
 633  */
 634
 635 void ide_setup_ports (  hw_regs_t *hw,
 636                         unsigned long base, int *offsets,
 637                         unsigned long ctrl, unsigned long intr,
 638                         ide_ack_intr_t *ack_intr,
 639 /*
 640  *                      ide_io_ops_t *iops,
 641  */
 642                         int irq)
 643 {
 644         int i;
 645
 646         memset(hw, 0, sizeof(hw_regs_t));
 647         for (i = 0; i < IDE_NR_PORTS; i++) {
 648                 if (offsets[i] == -1) {
 649                         switch(i) {
 650                                 case IDE_CONTROL_OFFSET:
 651                                         hw->io_ports[i] = ctrl;
 652                                         break;
 653 #if defined(CONFIG_AMIGA) || defined(CONFIG_MAC)
 654                                 case IDE_IRQ_OFFSET:
 655                                         hw->io_ports[i] = intr;
 656                                         break;
 657 #endif /* (CONFIG_AMIGA) || (CONFIG_MAC) */
 658                                 default:
 659                                         hw->io_ports[i] = 0;
 660                                         break;
 661                         }
 662                 } else {
 663                         hw->io_ports[i] = base + offsets[i];
 664                 }
 665         }
 666         hw->irq = irq;
 667         hw->ack_intr = ack_intr;
 668 /*
 669  *      hw->iops = iops;
 670  */
 671 }
 672
 673 void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
 674 {
 675         memcpy(hwif->io_ports, hw->io_ports, sizeof(hwif->io_ports));
 676         hwif->irq = hw->irq;
 677         hwif->noprobe = 0;
 678         hwif->chipset = hw->chipset;
 679         hwif->gendev.parent = hw->dev;
 680         hwif->ack_intr = hw->ack_intr;
 681 }
 682 EXPORT_SYMBOL_GPL(ide_init_port_hw);
 683
 684 /**
 685  *      ide_register_hw         -       register IDE interface
 686  *      @hw: hardware registers
 687  *      @quirkproc: quirkproc function
 688  *      @hwifp: pointer to returned hwif
 689  *
 690  *      Register an IDE interface, specifying exactly the registers etc.
 691  *
 692  *      Returns -1 on error.
 693  */
 694
 695 int ide_register_hw(hw_regs_t *hw, void (*quirkproc)(ide_drive_t *),
 696                     ide_hwif_t **hwifp)
 697 {
 698         int index, retry = 1;
 699         ide_hwif_t *hwif;
 700         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
 701
 702         do {
 703                 for (index = 0; index < MAX_HWIFS; ++index) {
 704                         hwif = &ide_hwifs[index];
 705                         if (hwif->io_ports[IDE_DATA_OFFSET] == hw->io_ports[IDE_DATA_OFFSET])
 706                                 goto found;
 707                 }
 708                 for (index = 0; index < MAX_HWIFS; ++index) {
 709                         hwif = &ide_hwifs[index];
 710                         if (hwif->hold)
 711                                 continue;
 712                         if (!hwif->present && hwif->mate == NULL)
 713                                 goto found;
 714                 }
 715                 for (index = 0; index < MAX_HWIFS; index++)
 716                         ide_unregister(index);
 717         } while (retry--);
 718         return -1;
 719 found:
 720         if (hwif->present)
 721                 ide_unregister(index);
 722         else if (!hwif->hold) {
 723                 ide_init_port_data(hwif, index);
 724                 init_hwif_default(hwif, index);
 725         }
 726         if (hwif->present)
 727                 return -1;
 728
 729         ide_init_port_hw(hwif, hw);
 730         hwif->quirkproc = quirkproc;
 731
 732         idx[0] = index;
 733
 734         ide_device_add(idx);
 735
 736         if (hwifp)
 737                 *hwifp = hwif;
 738
 739         return hwif->present ? index : -1;
 740 }
 741
 742 EXPORT_SYMBOL(ide_register_hw);
 743
 744 /*
 745  *      Locks for IDE setting functionality
 746  */
 747
 748 DEFINE_MUTEX(ide_setting_mtx);
 749
 750 EXPORT_SYMBOL_GPL(ide_setting_mtx);
 751
 752 /**
 753  *      ide_spin_wait_hwgroup   -       wait for group
 754  *      @drive: drive in the group
 755  *
 756  *      Wait for an IDE device group to go non busy and then return
 757  *      holding the ide_lock which guards the hwgroup->busy status
 758  *      and right to use it.
 759  */
 760
 761 int ide_spin_wait_hwgroup (ide_drive_t *drive)
 762 {
 763         ide_hwgroup_t *hwgroup = HWGROUP(drive);
 764         unsigned long timeout = jiffies + (3 * HZ);
 765
 766         spin_lock_irq(&ide_lock);
 767
 768         while (hwgroup->busy) {
 769                 unsigned long lflags;
 770                 spin_unlock_irq(&ide_lock);
 771                 local_irq_set(lflags);
 772                 if (time_after(jiffies, timeout)) {
 773                         local_irq_restore(lflags);
 774                         printk(KERN_ERR "%s: channel busy\n", drive->name);
 775                         return -EBUSY;
 776                 }
 777                 local_irq_restore(lflags);
 778                 spin_lock_irq(&ide_lock);
 779         }
 780         return 0;
 781 }
 782
 783 EXPORT_SYMBOL(ide_spin_wait_hwgroup);
 784
 785 int set_io_32bit(ide_drive_t *drive, int arg)
 786 {
 787         if (drive->no_io_32bit)
 788                 return -EPERM;
 789
 790         if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
 791                 return -EINVAL;
 792
 793         if (ide_spin_wait_hwgroup(drive))
 794                 return -EBUSY;
 795
 796         drive->io_32bit = arg;
 797 #ifdef CONFIG_BLK_DEV_DTC2278
 798         if (HWIF(drive)->chipset == ide_dtc2278)
 799                 HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
 800 #endif /* CONFIG_BLK_DEV_DTC2278 */
 801
 802         spin_unlock_irq(&ide_lock);
 803
 804         return 0;
 805 }
 806
 807 static int set_ksettings(ide_drive_t *drive, int arg)
 808 {
 809         if (arg < 0 || arg > 1)
 810                 return -EINVAL;
 811
 812         if (ide_spin_wait_hwgroup(drive))
 813                 return -EBUSY;
 814         drive->keep_settings = arg;
 815         spin_unlock_irq(&ide_lock);
 816
 817         return 0;
 818 }
 819
 820 int set_using_dma(ide_drive_t *drive, int arg)
 821 {
 822 #ifdef CONFIG_BLK_DEV_IDEDMA
 823         ide_hwif_t *hwif = drive->hwif;
 824         int err = -EPERM;
 825
 826         if (arg < 0 || arg > 1)
 827                 return -EINVAL;
 828
 829         if (!drive->id || !(drive->id->capability & 1))
 830                 goto out;
 831
 832         if (hwif->dma_host_set == NULL)
 833                 goto out;
 834
 835         err = -EBUSY;
 836         if (ide_spin_wait_hwgroup(drive))
 837                 goto out;
 838         /*
 839          * set ->busy flag, unlock and let it ride
 840          */
 841         hwif->hwgroup->busy = 1;
 842         spin_unlock_irq(&ide_lock);
 843
 844         err = 0;
 845
 846         if (arg) {
 847                 if (ide_set_dma(drive))
 848                         err = -EIO;
 849         } else
 850                 ide_dma_off(drive);
 851
 852         /*
 853          * lock, clear ->busy flag and unlock before leaving
 854          */
 855         spin_lock_irq(&ide_lock);
 856         hwif->hwgroup->busy = 0;
 857         spin_unlock_irq(&ide_lock);
 858 out:
 859         return err;
 860 #else
 861         if (arg < 0 || arg > 1)
 862                 return -EINVAL;
 863
 864         return -EPERM;
 865 #endif
 866 }
 867
 868 int set_pio_mode(ide_drive_t *drive, int arg)
 869 {
 870         struct request rq;
 871
 872         if (arg < 0 || arg > 255)
 873                 return -EINVAL;
 874
 875         if (drive->hwif->set_pio_mode == NULL)
 876                 return -ENOSYS;
 877
 878         if (drive->special.b.set_tune)
 879                 return -EBUSY;
 880
 881         ide_init_drive_cmd(&rq);
 882         rq.cmd_type = REQ_TYPE_ATA_TASKFILE;
 883
 884         drive->tune_req = (u8) arg;
 885         drive->special.b.set_tune = 1;
 886         (void) ide_do_drive_cmd(drive, &rq, ide_wait);
 887         return 0;
 888 }
 889
 890 static int set_unmaskirq(ide_drive_t *drive, int arg)
 891 {
 892         if (drive->no_unmask)
 893                 return -EPERM;
 894
 895         if (arg < 0 || arg > 1)
 896                 return -EINVAL;
 897
 898         if (ide_spin_wait_hwgroup(drive))
 899                 return -EBUSY;
 900         drive->unmask = arg;
 901         spin_unlock_irq(&ide_lock);
 902
 903         return 0;
 904 }
 905
 906 /**
 907  *      system_bus_clock        -       clock guess
 908  *
 909  *      External version of the bus clock guess used by very old IDE drivers
 910  *      for things like VLB timings. Should not be used.
 911  */
 912
 913 int system_bus_clock (void)
 914 {
 915         return((int) ((!system_bus_speed) ? ide_system_bus_speed() : system_bus_speed ));
 916 }
 917
 918 EXPORT_SYMBOL(system_bus_clock);
 919
 920 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 921 {
 922         ide_drive_t *drive = dev->driver_data;
 923         ide_hwif_t *hwif = HWIF(drive);
 924         struct request rq;
 925         struct request_pm_state rqpm;
 926         ide_task_t args;
 927         int ret;
 928
 929         /* Call ACPI _GTM only once */
 930         if (!(drive->dn % 2))
 931                 ide_acpi_get_timing(hwif);
 932
 933         memset(&rq, 0, sizeof(rq));
 934         memset(&rqpm, 0, sizeof(rqpm));
 935         memset(&args, 0, sizeof(args));
 936         rq.cmd_type = REQ_TYPE_PM_SUSPEND;
 937         rq.special = &args;
 938         rq.data = &rqpm;
 939         rqpm.pm_step = ide_pm_state_start_suspend;
 940         if (mesg.event == PM_EVENT_PRETHAW)
 941                 mesg.event = PM_EVENT_FREEZE;
 942         rqpm.pm_state = mesg.event;
 943
 944         ret = ide_do_drive_cmd(drive, &rq, ide_wait);
 945         /* only call ACPI _PS3 after both drivers are suspended */
 946         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 947                  && hwif->drives[1].present)
 948                  || !hwif->drives[0].present
 949                  || !hwif->drives[1].present))
 950                 ide_acpi_set_state(hwif, 0);
 951         return ret;
 952 }
 953
 954 static int generic_ide_resume(struct device *dev)
 955 {
 956         ide_drive_t *drive = dev->driver_data;
 957         ide_hwif_t *hwif = HWIF(drive);
 958         struct request rq;
 959         struct request_pm_state rqpm;
 960         ide_task_t args;
 961         int err;
 962
 963         /* Call ACPI _STM only once */
 964         if (!(drive->dn % 2)) {
 965                 ide_acpi_set_state(hwif, 1);
 966                 ide_acpi_push_timing(hwif);
 967         }
 968
 969         ide_acpi_exec_tfs(drive);
 970
 971         memset(&rq, 0, sizeof(rq));
 972         memset(&rqpm, 0, sizeof(rqpm));
 973         memset(&args, 0, sizeof(args));
 974         rq.cmd_type = REQ_TYPE_PM_RESUME;
 975         rq.special = &args;
 976         rq.data = &rqpm;
 977         rqpm.pm_step = ide_pm_state_start_resume;
 978         rqpm.pm_state = PM_EVENT_ON;
 979
 980         err = ide_do_drive_cmd(drive, &rq, ide_head_wait);
 981
 982         if (err == 0 && dev->driver) {
 983                 ide_driver_t *drv = to_ide_driver(dev->driver);
 984
 985                 if (drv->resume)
 986                         drv->resume(drive);
 987         }
 988
 989         return err;
 990 }
 991
 992 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 993                         unsigned int cmd, unsigned long arg)
 994 {
 995         unsigned long flags;
 996         ide_driver_t *drv;
 997         void __user *p = (void __user *)arg;
 998         int err = 0, (*setfunc)(ide_drive_t *, int);
 999         u8 *val;
1000
1001         switch (cmd) {
1002         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
1003         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
1004         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
1005         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
1006         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
1007         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
1008         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
1009         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
1010         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
1011         }
1012
1013         switch (cmd) {
1014                 case HDIO_OBSOLETE_IDENTITY:
1015                 case HDIO_GET_IDENTITY:
1016                         if (bdev != bdev->bd_contains)
1017                                 return -EINVAL;
1018                         if (drive->id_read == 0)
1019                                 return -ENOMSG;
1020                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
1021                                 return -EFAULT;
1022                         return 0;
1023
1024                 case HDIO_GET_NICE:
1025                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
1026                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
1027                                         drive->nice0            <<      IDE_NICE_0              |
1028                                         drive->nice1            <<      IDE_NICE_1              |
1029                                         drive->nice2            <<      IDE_NICE_2,
1030                                         (long __user *) arg);
1031
1032 #ifdef CONFIG_IDE_TASK_IOCTL
1033                 case HDIO_DRIVE_TASKFILE:
1034                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1035                                 return -EACCES;
1036                         switch(drive->media) {
1037                                 case ide_disk:
1038                                         return ide_taskfile_ioctl(drive, cmd, arg);
1039                                 default:
1040                                         return -ENOMSG;
1041                         }
1042 #endif /* CONFIG_IDE_TASK_IOCTL */
1043
1044                 case HDIO_DRIVE_CMD:
1045                         if (!capable(CAP_SYS_RAWIO))
1046                                 return -EACCES;
1047                         return ide_cmd_ioctl(drive, cmd, arg);
1048
1049                 case HDIO_DRIVE_TASK:
1050                         if (!capable(CAP_SYS_RAWIO))
1051                                 return -EACCES;
1052                         return ide_task_ioctl(drive, cmd, arg);
1053
1054                 case HDIO_SCAN_HWIF:
1055                 {
1056                         hw_regs_t hw;
1057                         int args[3];
1058                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1059                         if (copy_from_user(args, p, 3 * sizeof(int)))
1060                                 return -EFAULT;
1061                         memset(&hw, 0, sizeof(hw));
1062                         ide_init_hwif_ports(&hw, (unsigned long) args[0],
1063                                             (unsigned long) args[1], NULL);
1064                         hw.irq = args[2];
1065                         if (ide_register_hw(&hw, NULL, NULL) == -1)
1066                                 return -EIO;
1067                         return 0;
1068                 }
1069                 case HDIO_UNREGISTER_HWIF:
1070                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1071                         /* (arg > MAX_HWIFS) checked in function */
1072                         ide_unregister(arg);
1073                         return 0;
1074                 case HDIO_SET_NICE:
1075                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1076                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
1077                                 return -EPERM;
1078                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
1079                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
1080                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
1081                                 drive->dsc_overlap = 0;
1082                                 return -EPERM;
1083                         }
1084                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
1085                         return 0;
1086                 case HDIO_DRIVE_RESET:
1087                 {
1088                         unsigned long flags;
1089                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1090
1091                         /*
1092                          *      Abort the current command on the
1093                          *      group if there is one, taking
1094                          *      care not to allow anything else
1095                          *      to be queued and to die on the
1096                          *      spot if we miss one somehow
1097                          */
1098
1099                         spin_lock_irqsave(&ide_lock, flags);
1100
1101                         if (HWGROUP(drive)->resetting) {
1102                                 spin_unlock_irqrestore(&ide_lock, flags);
1103                                 return -EBUSY;
1104                         }
1105
1106                         ide_abort(drive, "drive reset");
1107
1108                         BUG_ON(HWGROUP(drive)->handler);
1109
1110                         /* Ensure nothing gets queued after we
1111                            drop the lock. Reset will clear the busy */
1112
1113                         HWGROUP(drive)->busy = 1;
1114                         spin_unlock_irqrestore(&ide_lock, flags);
1115                         (void) ide_do_reset(drive);
1116
1117                         return 0;
1118                 }
1119
1120                 case HDIO_GET_BUSSTATE:
1121                         if (!capable(CAP_SYS_ADMIN))
1122                                 return -EACCES;
1123                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
1124                                 return -EFAULT;
1125                         return 0;
1126
1127                 case HDIO_SET_BUSSTATE:
1128                         if (!capable(CAP_SYS_ADMIN))
1129                                 return -EACCES;
1130                         if (HWIF(drive)->busproc)
1131                                 return HWIF(drive)->busproc(drive, (int)arg);
1132                         return -EOPNOTSUPP;
1133                 default:
1134                         return -EINVAL;
1135         }
1136
1137 read_val:
1138         mutex_lock(&ide_setting_mtx);
1139         spin_lock_irqsave(&ide_lock, flags);
1140         err = *val;
1141         spin_unlock_irqrestore(&ide_lock, flags);
1142         mutex_unlock(&ide_setting_mtx);
1143         return err >= 0 ? put_user(err, (long __user *)arg) : err;
1144
1145 set_val:
1146         if (bdev != bdev->bd_contains)
1147                 err = -EINVAL;
1148         else {
1149                 if (!capable(CAP_SYS_ADMIN))
1150                         err = -EACCES;
1151                 else {
1152                         mutex_lock(&ide_setting_mtx);
1153                         err = setfunc(drive, arg);
1154                         mutex_unlock(&ide_setting_mtx);
1155                 }
1156         }
1157         return err;
1158 }
1159
1160 EXPORT_SYMBOL(generic_ide_ioctl);
1161
1162 /*
1163  * stridx() returns the offset of c within s,
1164  * or -1 if c is '\0' or not found within s.
1165  */
1166 static int __init stridx (const char *s, char c)
1167 {
1168         char *i = strchr(s, c);
1169         return (i && c) ? i - s : -1;
1170 }
1171
1172 /*
1173  * match_parm() does parsing for ide_setup():
1174  *
1175  * 1. the first char of s must be '='.
1176  * 2. if the remainder matches one of the supplied keywords,
1177  *     the index (1 based) of the keyword is negated and returned.
1178  * 3. if the remainder is a series of no more than max_vals numbers
1179  *     separated by commas, the numbers are saved in vals[] and a
1180  *     count of how many were saved is returned.  Base10 is assumed,
1181  *     and base16 is allowed when prefixed with "0x".
1182  * 4. otherwise, zero is returned.
1183  */
1184 static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
1185 {
1186         static const char *decimal = "0123456789";
1187         static const char *hex = "0123456789abcdef";
1188         int i, n;
1189
1190         if (*s++ == '=') {
1191                 /*
1192                  * Try matching against the supplied keywords,
1193                  * and return -(index+1) if we match one
1194                  */
1195                 if (keywords != NULL) {
1196                         for (i = 0; *keywords != NULL; ++i) {
1197                                 if (!strcmp(s, *keywords++))
1198                                         return -(i+1);
1199                         }
1200                 }
1201                 /*
1202                  * Look for a series of no more than "max_vals"
1203                  * numeric values separated by commas, in base10,
1204                  * or base16 when prefixed with "0x".
1205                  * Return a count of how many were found.
1206                  */
1207                 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
1208                         vals[n] = i;
1209                         while ((i = stridx(decimal, *++s)) >= 0)
1210                                 vals[n] = (vals[n] * 10) + i;
1211                         if (*s == 'x' && !vals[n]) {
1212                                 while ((i = stridx(hex, *++s)) >= 0)
1213                                         vals[n] = (vals[n] * 0x10) + i;
1214                         }
1215                         if (++n == max_vals)
1216                                 break;
1217                         if (*s == ',' || *s == ';')
1218                                 ++s;
1219                 }
1220                 if (!*s)
1221                         return n;
1222         }
1223         return 0;       /* zero = nothing matched */
1224 }
1225
1226 extern int probe_ali14xx;
1227 extern int probe_umc8672;
1228 extern int probe_dtc2278;
1229 extern int probe_ht6560b;
1230 extern int probe_qd65xx;
1231 extern int cmd640_vlb;
1232
1233 static int __initdata is_chipset_set[MAX_HWIFS];
1234
1235 /*
1236  * ide_setup() gets called VERY EARLY during initialization,
1237  * to handle kernel "command line" strings beginning with "hdx=" or "ide".
1238  *
1239  * Remember to update Documentation/ide.txt if you change something here.
1240  */
1241 static int __init ide_setup(char *s)
1242 {
1243         int i, vals[3];
1244         ide_hwif_t *hwif;
1245         ide_drive_t *drive;
1246         unsigned int hw, unit;
1247         const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
1248         const char max_hwif  = '0' + (MAX_HWIFS - 1);
1249
1250
1251         if (strncmp(s,"hd",2) == 0 && s[2] == '=')      /* hd= is for hd.c   */
1252                 return 0;                               /* driver and not us */
1253
1254         if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
1255                 return 0;
1256
1257         printk(KERN_INFO "ide_setup: %s", s);
1258         init_ide_data ();
1259
1260 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
1261         if (!strcmp(s, "ide=doubler")) {
1262                 extern int ide_doubler;
1263
1264                 printk(" : Enabled support for IDE doublers\n");
1265                 ide_doubler = 1;
1266                 return 1;
1267         }
1268 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
1269
1270         if (!strcmp(s, "ide=nodma")) {
1271                 printk(" : Prevented DMA\n");
1272                 noautodma = 1;
1273                 goto obsolete_option;
1274         }
1275
1276 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
1277         if (!strcmp(s, "ide=reverse")) {
1278                 ide_scan_direction = 1;
1279                 printk(" : Enabled support for IDE inverse scan order.\n");
1280                 return 1;
1281         }
1282 #endif
1283
1284 #ifdef CONFIG_BLK_DEV_IDEACPI
1285         if (!strcmp(s, "ide=noacpi")) {
1286                 //printk(" : Disable IDE ACPI support.\n");
1287                 ide_noacpi = 1;
1288                 return 1;
1289         }
1290         if (!strcmp(s, "ide=acpigtf")) {
1291                 //printk(" : Enable IDE ACPI _GTF support.\n");
1292                 ide_noacpitfs = 0;
1293                 return 1;
1294         }
1295         if (!strcmp(s, "ide=acpionboot")) {
1296                 //printk(" : Call IDE ACPI methods on boot.\n");
1297                 ide_noacpionboot = 0;
1298                 return 1;
1299         }
1300 #endif /* CONFIG_BLK_DEV_IDEACPI */
1301
1302         /*
1303          * Look for drive options:  "hdx="
1304          */
1305         if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
1306                 const char *hd_words[] = {
1307                         "none", "noprobe", "nowerr", "cdrom", "nodma",
1308                         "autotune", "noautotune", "-8", "-9", "-10",
1309                         "noflush", "remap", "remap63", "scsi", NULL };
1310                 unit = s[2] - 'a';
1311                 hw   = unit / MAX_DRIVES;
1312                 unit = unit % MAX_DRIVES;
1313                 hwif = &ide_hwifs[hw];
1314                 drive = &hwif->drives[unit];
1315                 if (strncmp(s + 4, "ide-", 4) == 0) {
1316                         strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
1317                         goto done;
1318                 }
1319                 switch (match_parm(&s[3], hd_words, vals, 3)) {
1320                         case -1: /* "none" */
1321                         case -2: /* "noprobe" */
1322                                 drive->noprobe = 1;
1323                                 goto done;
1324                         case -3: /* "nowerr" */
1325                                 drive->bad_wstat = BAD_R_STAT;
1326                                 hwif->noprobe = 0;
1327                                 goto done;
1328                         case -4: /* "cdrom" */
1329                                 drive->present = 1;
1330                                 drive->media = ide_cdrom;
1331                                 /* an ATAPI device ignores DRDY */
1332                                 drive->ready_stat = 0;
1333                                 hwif->noprobe = 0;
1334                                 goto done;
1335                         case -5: /* nodma */
1336                                 drive->nodma = 1;
1337                                 goto done;
1338                         case -6: /* "autotune" */
1339                                 drive->autotune = IDE_TUNE_AUTO;
1340                                 goto obsolete_option;
1341                         case -7: /* "noautotune" */
1342                                 drive->autotune = IDE_TUNE_NOAUTO;
1343                                 goto obsolete_option;
1344                         case -11: /* noflush */
1345                                 drive->noflush = 1;
1346                                 goto done;
1347                         case -12: /* "remap" */
1348                                 drive->remap_0_to_1 = 1;
1349                                 goto done;
1350                         case -13: /* "remap63" */
1351                                 drive->sect0 = 63;
1352                                 goto done;
1353                         case -14: /* "scsi" */
1354                                 drive->scsi = 1;
1355                                 goto done;
1356                         case 3: /* cyl,head,sect */
1357                                 drive->media    = ide_disk;
1358                                 drive->ready_stat = READY_STAT;
1359                                 drive->cyl      = drive->bios_cyl  = vals[0];
1360                                 drive->head     = drive->bios_head = vals[1];
1361                                 drive->sect     = drive->bios_sect = vals[2];
1362                                 drive->present  = 1;
1363                                 drive->forced_geom = 1;
1364                                 hwif->noprobe = 0;
1365                                 goto done;
1366                         default:
1367                                 goto bad_option;
1368                 }
1369         }
1370
1371         if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
1372                 goto bad_option;
1373         /*
1374          * Look for bus speed option:  "idebus="
1375          */
1376         if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
1377                 if (match_parm(&s[6], NULL, vals, 1) != 1)
1378                         goto bad_option;
1379                 if (vals[0] >= 20 && vals[0] <= 66) {
1380                         idebus_parameter = vals[0];
1381                 } else
1382                         printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
1383                 goto done;
1384         }
1385         /*
1386          * Look for interface options:  "idex="
1387          */
1388         if (s[3] >= '0' && s[3] <= max_hwif) {
1389                 /*
1390                  * Be VERY CAREFUL changing this: note hardcoded indexes below
1391                  * (-8, -9, -10) are reserved to ease the hardcoding.
1392                  */
1393                 static const char *ide_words[] = {
1394                         "noprobe", "serialize", "minus3", "minus4",
1395                         "reset", "minus6", "ata66", "minus8", "minus9",
1396                         "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
1397                         "dtc2278", "umc8672", "ali14xx", NULL };
1398
1399                 hw_regs_t hwregs;
1400
1401                 hw = s[3] - '0';
1402                 hwif = &ide_hwifs[hw];
1403                 i = match_parm(&s[4], ide_words, vals, 3);
1404
1405                 /*
1406                  * Cryptic check to ensure chipset not already set for hwif.
1407                  * Note: we can't depend on hwif->chipset here.
1408                  */
1409                 if ((i >= -18 && i <= -11) || (i > 0 && i <= 3)) {
1410                         /* chipset already specified */
1411                         if (is_chipset_set[hw])
1412                                 goto bad_option;
1413                         if (i > -18 && i <= -11) {
1414                                 /* these drivers are for "ide0=" only */
1415                                 if (hw != 0)
1416                                         goto bad_hwif;
1417                                 /* chipset already specified for 2nd port */
1418                                 if (is_chipset_set[hw+1])
1419                                         goto bad_option;
1420                         }
1421                         is_chipset_set[hw] = 1;
1422                         printk("\n");
1423                 }
1424
1425                 switch (i) {
1426 #ifdef CONFIG_BLK_DEV_ALI14XX
1427                         case -17: /* "ali14xx" */
1428                                 probe_ali14xx = 1;
1429                                 goto done;
1430 #endif
1431 #ifdef CONFIG_BLK_DEV_UMC8672
1432                         case -16: /* "umc8672" */
1433                                 probe_umc8672 = 1;
1434                                 goto done;
1435 #endif
1436 #ifdef CONFIG_BLK_DEV_DTC2278
1437                         case -15: /* "dtc2278" */
1438                                 probe_dtc2278 = 1;
1439                                 goto done;
1440 #endif
1441 #ifdef CONFIG_BLK_DEV_CMD640
1442                         case -14: /* "cmd640_vlb" */
1443                                 cmd640_vlb = 1;
1444                                 goto done;
1445 #endif
1446 #ifdef CONFIG_BLK_DEV_HT6560B
1447                         case -13: /* "ht6560b" */
1448                                 probe_ht6560b = 1;
1449                                 goto done;
1450 #endif
1451 #ifdef CONFIG_BLK_DEV_QD65XX
1452                         case -12: /* "qd65xx" */
1453                                 probe_qd65xx = 1;
1454                                 goto done;
1455 #endif
1456 #ifdef CONFIG_BLK_DEV_4DRIVES
1457                         case -11: /* "four" drives on one set of ports */
1458                         {
1459                                 ide_hwif_t *mate = &ide_hwifs[hw^1];
1460                                 mate->drives[0].select.all ^= 0x20;
1461                                 mate->drives[1].select.all ^= 0x20;
1462                                 hwif->chipset = mate->chipset = ide_4drives;
1463                                 mate->irq = hwif->irq;
1464                                 memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
1465                                 hwif->mate = mate;
1466                                 mate->mate = hwif;
1467                                 hwif->serialized = mate->serialized = 1;
1468                                 goto obsolete_option;
1469                         }
1470 #endif /* CONFIG_BLK_DEV_4DRIVES */
1471                         case -10: /* minus10 */
1472                         case -9: /* minus9 */
1473                         case -8: /* minus8 */
1474                         case -6:
1475                         case -4:
1476                         case -3:
1477                                 goto bad_option;
1478                         case -7: /* ata66 */
1479 #ifdef CONFIG_BLK_DEV_IDEPCI
1480                                 /*
1481                                  * Use ATA_CBL_PATA40_SHORT so drive side
1482                                  * cable detection is also overriden.
1483                                  */
1484                                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1485                                 goto obsolete_option;
1486 #else
1487                                 goto bad_hwif;
1488 #endif
1489                         case -5: /* "reset" */
1490                                 hwif->reset = 1;
1491                                 goto obsolete_option;
1492                         case -2: /* "serialize" */
1493                                 hwif->mate = &ide_hwifs[hw^1];
1494                                 hwif->mate->mate = hwif;
1495                                 hwif->serialized = hwif->mate->serialized = 1;
1496                                 goto obsolete_option;
1497
1498                         case -1: /* "noprobe" */
1499                                 hwif->noprobe = 1;
1500                                 goto done;
1501
1502                         case 1: /* base */
1503                                 vals[1] = vals[0] + 0x206; /* default ctl */
1504                         case 2: /* base,ctl */
1505                                 vals[2] = 0;    /* default irq = probe for it */
1506                         case 3: /* base,ctl,irq */
1507                                 memset(&hwregs, 0, sizeof(hwregs));
1508                                 ide_init_hwif_ports(&hwregs, vals[0], vals[1], &hwif->irq);
1509                                 memcpy(hwif->io_ports, hwregs.io_ports, sizeof(hwif->io_ports));
1510                                 hwif->irq      = vals[2];
1511                                 hwif->noprobe  = 0;
1512                                 hwif->chipset  = ide_forced;
1513                                 goto obsolete_option;
1514
1515                         case 0: goto bad_option;
1516                         default:
1517                                 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
1518                                 return 1;
1519                 }
1520         }
1521 bad_option:
1522         printk(" -- BAD OPTION\n");
1523         return 1;
1524 obsolete_option:
1525         printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
1526         return 1;
1527 bad_hwif:
1528         printk("-- NOT SUPPORTED ON ide%d", hw);
1529 done:
1530         printk("\n");
1531         return 1;
1532 }
1533
1534 EXPORT_SYMBOL(ide_lock);
1535
1536 static int ide_bus_match(struct device *dev, struct device_driver *drv)
1537 {
1538         return 1;
1539 }
1540
1541 static char *media_string(ide_drive_t *drive)
1542 {
1543         switch (drive->media) {
1544         case ide_disk:
1545                 return "disk";
1546         case ide_cdrom:
1547                 return "cdrom";
1548         case ide_tape:
1549                 return "tape";
1550         case ide_floppy:
1551                 return "floppy";
1552         case ide_optical:
1553                 return "optical";
1554         default:
1555                 return "UNKNOWN";
1556         }
1557 }
1558
1559 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
1560 {
1561         ide_drive_t *drive = to_ide_device(dev);
1562         return sprintf(buf, "%s\n", media_string(drive));
1563 }
1564
1565 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
1566 {
1567         ide_drive_t *drive = to_ide_device(dev);
1568         return sprintf(buf, "%s\n", drive->name);
1569 }
1570
1571 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1572 {
1573         ide_drive_t *drive = to_ide_device(dev);
1574         return sprintf(buf, "ide:m-%s\n", media_string(drive));
1575 }
1576
1577 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
1578                           char *buf)
1579 {
1580         ide_drive_t *drive = to_ide_device(dev);
1581         return sprintf(buf, "%s\n", drive->id->model);
1582 }
1583
1584 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
1585                              char *buf)
1586 {
1587         ide_drive_t *drive = to_ide_device(dev);
1588         return sprintf(buf, "%s\n", drive->id->fw_rev);
1589 }
1590
1591 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
1592                            char *buf)
1593 {
1594         ide_drive_t *drive = to_ide_device(dev);
1595         return sprintf(buf, "%s\n", drive->id->serial_no);
1596 }
1597
1598 static struct device_attribute ide_dev_attrs[] = {
1599         __ATTR_RO(media),
1600         __ATTR_RO(drivename),
1601         __ATTR_RO(modalias),
1602         __ATTR_RO(model),
1603         __ATTR_RO(firmware),
1604         __ATTR(serial, 0400, serial_show, NULL),
1605         __ATTR_NULL
1606 };
1607
1608 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
1609 {
1610         ide_drive_t *drive = to_ide_device(dev);
1611
1612         add_uevent_var(env, "MEDIA=%s", media_string(drive));
1613         add_uevent_var(env, "DRIVENAME=%s", drive->name);
1614         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
1615         return 0;
1616 }
1617
1618 static int generic_ide_probe(struct device *dev)
1619 {
1620         ide_drive_t *drive = to_ide_device(dev);
1621         ide_driver_t *drv = to_ide_driver(dev->driver);
1622
1623         return drv->probe ? drv->probe(drive) : -ENODEV;
1624 }
1625
1626 static int generic_ide_remove(struct device *dev)
1627 {
1628         ide_drive_t *drive = to_ide_device(dev);
1629         ide_driver_t *drv = to_ide_driver(dev->driver);
1630
1631         if (drv->remove)
1632                 drv->remove(drive);
1633
1634         return 0;
1635 }
1636
1637 static void generic_ide_shutdown(struct device *dev)
1638 {
1639         ide_drive_t *drive = to_ide_device(dev);
1640         ide_driver_t *drv = to_ide_driver(dev->driver);
1641
1642         if (dev->driver && drv->shutdown)
1643                 drv->shutdown(drive);
1644 }
1645
1646 struct bus_type ide_bus_type = {
1647         .name           = "ide",
1648         .match          = ide_bus_match,
1649         .uevent         = ide_uevent,
1650         .probe          = generic_ide_probe,
1651         .remove         = generic_ide_remove,
1652         .shutdown       = generic_ide_shutdown,
1653         .dev_attrs      = ide_dev_attrs,
1654         .suspend        = generic_ide_suspend,
1655         .resume         = generic_ide_resume,
1656 };
1657
1658 EXPORT_SYMBOL_GPL(ide_bus_type);
1659
1660 /*
1661  * This is gets invoked once during initialization, to set *everything* up
1662  */
1663 static int __init ide_init(void)
1664 {
1665         int ret;
1666
1667         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver " REVISION "\n");
1668         system_bus_speed = ide_system_bus_speed();
1669
1670         ret = bus_register(&ide_bus_type);
1671         if (ret < 0) {
1672                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1673                 return ret;
1674         }
1675
1676         init_ide_data();
1677
1678         proc_ide_create();
1679
1680         return 0;
1681 }
1682
1683 #ifdef MODULE
1684 static char *options = NULL;
1685 module_param(options, charp, 0);
1686 MODULE_LICENSE("GPL");
1687
1688 static void __init parse_options (char *line)
1689 {
1690         char *next = line;
1691
1692         if (line == NULL || !*line)
1693                 return;
1694         while ((line = next) != NULL) {
1695                 if ((next = strchr(line,' ')) != NULL)
1696                         *next++ = 0;
1697                 if (!ide_setup(line))
1698                         printk (KERN_INFO "Unknown option '%s'\n", line);
1699         }
1700 }
1701
1702 int __init init_module (void)
1703 {
1704         parse_options(options);
1705         return ide_init();
1706 }
1707
1708 void __exit cleanup_module (void)
1709 {
1710         int index;
1711
1712         for (index = 0; index < MAX_HWIFS; ++index)
1713                 ide_unregister(index);
1714
1715         proc_ide_destroy();
1716
1717         bus_unregister(&ide_bus_type);
1718 }
1719
1720 #else /* !MODULE */
1721
1722 __setup("", ide_setup);
1723
1724 module_init(ide_init);
1725
1726 #endif /* MODULE */