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   1 /*
   2  *  linux/drivers/ide/ide.c             Version 7.00beta2       Mar 05 2003
   3  *
   4  *  Copyright (C) 1994-1998  Linus Torvalds & authors (see below)
   5  */
   6
   7 /*
   8  *  Mostly written by Mark Lord  <mlord@pobox.com>
   9  *                and Gadi Oxman <gadio@netvision.net.il>
  10  *                and Andre Hedrick <andre@linux-ide.org>
  11  *
  12  *  See linux/MAINTAINERS for address of current maintainer.
  13  *
  14  * This is the multiple IDE interface driver, as evolved from hd.c.
  15  * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
  16  *   (usually 14 & 15).
  17  * There can be up to two drives per interface, as per the ATA-2 spec.
  18  *
  19  * ...
  20  *
  21  *  From hd.c:
  22  *  |
  23  *  | It traverses the request-list, using interrupts to jump between functions.
  24  *  | As nearly all functions can be called within interrupts, we may not sleep.
  25  *  | Special care is recommended.  Have Fun!
  26  *  |
  27  *  | modified by Drew Eckhardt to check nr of hd's from the CMOS.
  28  *  |
  29  *  | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
  30  *  | in the early extended-partition checks and added DM partitions.
  31  *  |
  32  *  | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
  33  *  |
  34  *  | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
  35  *  | and general streamlining by Mark Lord (mlord@pobox.com).
  36  *
  37  *  October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
  38  *
  39  *      Mark Lord       (mlord@pobox.com)               (IDE Perf.Pkg)
  40  *      Delman Lee      (delman@ieee.org)               ("Mr. atdisk2")
  41  *      Scott Snyder    (snyder@fnald0.fnal.gov)        (ATAPI IDE cd-rom)
  42  *
  43  *  This was a rewrite of just about everything from hd.c, though some original
  44  *  code is still sprinkled about.  Think of it as a major evolution, with
  45  *  inspiration from lots of linux users, esp.  hamish@zot.apana.org.au
  46  */
  47
  48 #define REVISION        "Revision: 7.00alpha2"
  49 #define VERSION         "Id: ide.c 7.00a2 20020906"
  50
  51 #define _IDE_C                  /* Tell ide.h it's really us */
  52
  53 #include <linux/module.h>
  54 #include <linux/types.h>
  55 #include <linux/string.h>
  56 #include <linux/kernel.h>
  57 #include <linux/timer.h>
  58 #include <linux/mm.h>
  59 #include <linux/interrupt.h>
  60 #include <linux/major.h>
  61 #include <linux/errno.h>
  62 #include <linux/genhd.h>
  63 #include <linux/blkpg.h>
  64 #include <linux/slab.h>
  65 #include <linux/init.h>
  66 #include <linux/pci.h>
  67 #include <linux/delay.h>
  68 #include <linux/ide.h>
  69 #include <linux/completion.h>
  70 #include <linux/reboot.h>
  71 #include <linux/cdrom.h>
  72 #include <linux/seq_file.h>
  73 #include <linux/device.h>
  74 #include <linux/bitops.h>
  75
  76 #include <asm/byteorder.h>
  77 #include <asm/irq.h>
  78 #include <asm/uaccess.h>
  79 #include <asm/io.h>
  80
  81
  82 /* default maximum number of failures */
  83 #define IDE_DEFAULT_MAX_FAILURES        1
  84
  85 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
  86                                         IDE2_MAJOR, IDE3_MAJOR,
  87                                         IDE4_MAJOR, IDE5_MAJOR,
  88                                         IDE6_MAJOR, IDE7_MAJOR,
  89                                         IDE8_MAJOR, IDE9_MAJOR };
  90
  91 static int idebus_parameter;    /* holds the "idebus=" parameter */
  92 static int system_bus_speed;    /* holds what we think is VESA/PCI bus speed */
  93
  94 DEFINE_MUTEX(ide_cfg_mtx);
  95  __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
  96
  97 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
  98 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
 882         ide_init_drive_cmd(&rq);
 883         rq.cmd_type = REQ_TYPE_ATA_TASKFILE;
 884
 885         drive->tune_req = (u8) arg;
 886         drive->special.b.set_tune = 1;
 887         (void) ide_do_drive_cmd(drive, &rq, ide_wait);
 888         return 0;
 889 }
 890
 891 static int set_unmaskirq(ide_drive_t *drive, int arg)
 892 {
 893         if (drive->no_unmask)
 894                 return -EPERM;
 895
 896         if (arg < 0 || arg > 1)
 897                 return -EINVAL;
 898
 899         if (ide_spin_wait_hwgroup(drive))
 900                 return -EBUSY;
 901         drive->unmask = arg;
 902         spin_unlock_irq(&ide_lock);
 903
 904         return 0;
 905 }
 906
 907 /**
 908  *      system_bus_clock        -       clock guess
 909  *
 910  *      External version of the bus clock guess used by very old IDE drivers
 911  *      for things like VLB timings. Should not be used.
 912  */
 913
 914 int system_bus_clock (void)
 915 {
 916         return((int) ((!system_bus_speed) ? ide_system_bus_speed() : system_bus_speed ));
 917 }
 918
 919 EXPORT_SYMBOL(system_bus_clock);
 920
 921 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 922 {
 923         ide_drive_t *drive = dev->driver_data;
 924         ide_hwif_t *hwif = HWIF(drive);
 925         struct request rq;
 926         struct request_pm_state rqpm;
 927         ide_task_t args;
 928         int ret;
 929
 930         /* Call ACPI _GTM only once */
 931         if (!(drive->dn % 2))
 932                 ide_acpi_get_timing(hwif);
 933
 934         memset(&rq, 0, sizeof(rq));
 935         memset(&rqpm, 0, sizeof(rqpm));
 936         memset(&args, 0, sizeof(args));
 937         rq.cmd_type = REQ_TYPE_PM_SUSPEND;
 938         rq.special = &args;
 939         rq.data = &rqpm;
 940         rqpm.pm_step = ide_pm_state_start_suspend;
 941         if (mesg.event == PM_EVENT_PRETHAW)
 942                 mesg.event = PM_EVENT_FREEZE;
 943         rqpm.pm_state = mesg.event;
 944
 945         ret = ide_do_drive_cmd(drive, &rq, ide_wait);
 946         /* only call ACPI _PS3 after both drivers are suspended */
 947         if (!ret && (((drive->dn % 2) && hwif->drives[0].present
 948                  && hwif->drives[1].present)
 949                  || !hwif->drives[0].present
 950                  || !hwif->drives[1].present))
 951                 ide_acpi_set_state(hwif, 0);
 952         return ret;
 953 }
 954
 955 static int generic_ide_resume(struct device *dev)
 956 {
 957         ide_drive_t *drive = dev->driver_data;
 958         ide_hwif_t *hwif = HWIF(drive);
 959         struct request rq;
 960         struct request_pm_state rqpm;
 961         ide_task_t args;
 962         int err;
 963
 964         /* Call ACPI _STM only once */
 965         if (!(drive->dn % 2)) {
 966                 ide_acpi_set_state(hwif, 1);
 967                 ide_acpi_push_timing(hwif);
 968         }
 969
 970         ide_acpi_exec_tfs(drive);
 971
 972         memset(&rq, 0, sizeof(rq));
 973         memset(&rqpm, 0, sizeof(rqpm));
 974         memset(&args, 0, sizeof(args));
 975         rq.cmd_type = REQ_TYPE_PM_RESUME;
 976         rq.special = &args;
 977         rq.data = &rqpm;
 978         rqpm.pm_step = ide_pm_state_start_resume;
 979         rqpm.pm_state = PM_EVENT_ON;
 980
 981         err = ide_do_drive_cmd(drive, &rq, ide_head_wait);
 982
 983         if (err == 0 && dev->driver) {
 984                 ide_driver_t *drv = to_ide_driver(dev->driver);
 985
 986                 if (drv->resume)
 987                         drv->resume(drive);
 988         }
 989
 990         return err;
 991 }
 992
 993 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 994                         unsigned int cmd, unsigned long arg)
 995 {
 996         unsigned long flags;
 997         ide_driver_t *drv;
 998         void __user *p = (void __user *)arg;
 999         int err = 0, (*setfunc)(ide_drive_t *, int);
1000         u8 *val;
1001
1002         switch (cmd) {
1003         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
1004         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
1005         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
1006         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
1007         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
1008         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
1009         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
1010         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
1011         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
1012         }
1013
1014         switch (cmd) {
1015                 case HDIO_OBSOLETE_IDENTITY:
1016                 case HDIO_GET_IDENTITY:
1017                         if (bdev != bdev->bd_contains)
1018                                 return -EINVAL;
1019                         if (drive->id_read == 0)
1020                                 return -ENOMSG;
1021                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
1022                                 return -EFAULT;
1023                         return 0;
1024
1025                 case HDIO_GET_NICE:
1026                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
1027                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
1028                                         drive->nice0            <<      IDE_NICE_0              |
1029                                         drive->nice1            <<      IDE_NICE_1              |
1030                                         drive->nice2            <<      IDE_NICE_2,
1031                                         (long __user *) arg);
1032
1033 #ifdef CONFIG_IDE_TASK_IOCTL
1034                 case HDIO_DRIVE_TASKFILE:
1035                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1036                                 return -EACCES;
1037                         switch(drive->media) {
1038                                 case ide_disk:
1039                                         return ide_taskfile_ioctl(drive, cmd, arg);
1040                                 default:
1041                                         return -ENOMSG;
1042                         }
1043 #endif /* CONFIG_IDE_TASK_IOCTL */
1044
1045                 case HDIO_DRIVE_CMD:
1046                         if (!capable(CAP_SYS_RAWIO))
1047                                 return -EACCES;
1048                         return ide_cmd_ioctl(drive, cmd, arg);
1049
1050                 case HDIO_DRIVE_TASK:
1051                         if (!capable(CAP_SYS_RAWIO))
1052                                 return -EACCES;
1053                         return ide_task_ioctl(drive, cmd, arg);
1054
1055                 case HDIO_SCAN_HWIF:
1056                 {
1057                         hw_regs_t hw;
1058                         int args[3];
1059                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1060                         if (copy_from_user(args, p, 3 * sizeof(int)))
1061                                 return -EFAULT;
1062                         memset(&hw, 0, sizeof(hw));
1063                         ide_init_hwif_ports(&hw, (unsigned long) args[0],
1064                                             (unsigned long) args[1], NULL);
1065                         hw.irq = args[2];
1066                         if (ide_register_hw(&hw, NULL, NULL) == -1)
1067                                 return -EIO;
1068                         return 0;
1069                 }
1070                 case HDIO_UNREGISTER_HWIF:
1071                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1072                         /* (arg > MAX_HWIFS) checked in function */
1073                         ide_unregister(arg);
1074                         return 0;
1075                 case HDIO_SET_NICE:
1076                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1077                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
1078                                 return -EPERM;
1079                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
1080                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
1081                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
1082                                 drive->dsc_overlap = 0;
1083                                 return -EPERM;
1084                         }
1085                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
1086                         return 0;
1087                 case HDIO_DRIVE_RESET:
1088                 {
1089                         unsigned long flags;
1090                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1091
1092                         /*
1093                          *      Abort the current command on the
1094                          *      group if there is one, taking
1095                          *      care not to allow anything else
1096                          *      to be queued and to die on the
1097                          *      spot if we miss one somehow
1098                          */
1099
1100                         spin_lock_irqsave(&ide_lock, flags);
1101
1102                         if (HWGROUP(drive)->resetting) {
1103                                 spin_unlock_irqrestore(&ide_lock, flags);
1104                                 return -EBUSY;
1105                         }
1106
1107                         ide_abort(drive, "drive reset");
1108
1109                         BUG_ON(HWGROUP(drive)->handler);
1110
1111                         /* Ensure nothing gets queued after we
1112                            drop the lock. Reset will clear the busy */
1113
1114                         HWGROUP(drive)->busy = 1;
1115                         spin_unlock_irqrestore(&ide_lock, flags);
1116                         (void) ide_do_reset(drive);
1117
1118                         return 0;
1119                 }
1120
1121                 case HDIO_GET_BUSSTATE:
1122                         if (!capable(CAP_SYS_ADMIN))
1123                                 return -EACCES;
1124                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
1125                                 return -EFAULT;
1126                         return 0;
1127
1128                 case HDIO_SET_BUSSTATE:
1129                         if (!capable(CAP_SYS_ADMIN))
1130                                 return -EACCES;
1131                         if (HWIF(drive)->busproc)
1132                                 return HWIF(drive)->busproc(drive, (int)arg);
1133                         return -EOPNOTSUPP;
1134                 default:
1135                         return -EINVAL;
1136         }
1137
1138 read_val:
1139         mutex_lock(&ide_setting_mtx);
1140         spin_lock_irqsave(&ide_lock, flags);
1141         err = *val;
1142         spin_unlock_irqrestore(&ide_lock, flags);
1143         mutex_unlock(&ide_setting_mtx);
1144         return err >= 0 ? put_user(err, (long __user *)arg) : err;
1145
1146 set_val:
1147         if (bdev != bdev->bd_contains)
1148                 err = -EINVAL;
1149         else {
1150                 if (!capable(CAP_SYS_ADMIN))
1151                         err = -EACCES;
1152                 else {
1153                         mutex_lock(&ide_setting_mtx);
1154                         err = setfunc(drive, arg);
1155                         mutex_unlock(&ide_setting_mtx);
1156                 }
1157         }
1158         return err;
1159 }
1160
1161 EXPORT_SYMBOL(generic_ide_ioctl);
1162
1163 /*
1164  * stridx() returns the offset of c within s,
1165  * or -1 if c is '\0' or not found within s.
1166  */
1167 static int __init stridx (const char *s, char c)
1168 {
1169         char *i = strchr(s, c);
1170         return (i && c) ? i - s : -1;
1171 }
1172
1173 /*
1174  * match_parm() does parsing for ide_setup():
1175  *
1176  * 1. the first char of s must be '='.
1177  * 2. if the remainder matches one of the supplied keywords,
1178  *     the index (1 based) of the keyword is negated and returned.
1179  * 3. if the remainder is a series of no more than max_vals numbers
1180  *     separated by commas, the numbers are saved in vals[] and a
1181  *     count of how many were saved is returned.  Base10 is assumed,
1182  *     and base16 is allowed when prefixed with "0x".
1183  * 4. otherwise, zero is returned.
1184  */
1185 static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
1186 {
1187         static const char *decimal = "0123456789";
1188         static const char *hex = "0123456789abcdef";
1189         int i, n;
1190
1191         if (*s++ == '=') {
1192                 /*
1193                  * Try matching against the supplied keywords,
1194                  * and return -(index+1) if we match one
1195                  */
1196                 if (keywords != NULL) {
1197                         for (i = 0; *keywords != NULL; ++i) {
1198                                 if (!strcmp(s, *keywords++))
1199                                         return -(i+1);
1200                         }
1201                 }
1202                 /*
1203                  * Look for a series of no more than "max_vals"
1204                  * numeric values separated by commas, in base10,
1205                  * or base16 when prefixed with "0x".
1206                  * Return a count of how many were found.
1207                  */
1208                 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
1209                         vals[n] = i;
1210                         while ((i = stridx(decimal, *++s)) >= 0)
1211                                 vals[n] = (vals[n] * 10) + i;
1212                         if (*s == 'x' && !vals[n]) {
1213                                 while ((i = stridx(hex, *++s)) >= 0)
1214                                         vals[n] = (vals[n] * 0x10) + i;
1215                         }
1216                         if (++n == max_vals)
1217                                 break;
1218                         if (*s == ',' || *s == ';')
1219                                 ++s;
1220                 }
1221                 if (!*s)
1222                         return n;
1223         }
1224         return 0;       /* zero = nothing matched */
1225 }
1226
1227 extern int probe_ali14xx;
1228 extern int probe_umc8672;
1229 extern int probe_dtc2278;
1230 extern int probe_ht6560b;
1231 extern int probe_qd65xx;
1232 extern int cmd640_vlb;
1233
1234 static int __initdata is_chipset_set[MAX_HWIFS];
1235
1236 /*
1237  * ide_setup() gets called VERY EARLY during initialization,
1238  * to handle kernel "command line" strings beginning with "hdx=" or "ide".
1239  *
1240  * Remember to update Documentation/ide.txt if you change something here.
1241  */
1242 static int __init ide_setup(char *s)
1243 {
1244         int i, vals[3];
1245         ide_hwif_t *hwif;
1246         ide_drive_t *drive;
1247         unsigned int hw, unit;
1248         const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
1249         const char max_hwif  = '0' + (MAX_HWIFS - 1);
1250
1251
1252         if (strncmp(s,"hd",2) == 0 && s[2] == '=')      /* hd= is for hd.c   */
1253                 return 0;                               /* driver and not us */
1254
1255         if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
1256                 return 0;
1257
1258         printk(KERN_INFO "ide_setup: %s", s);
1259         init_ide_data ();
1260
1261 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
1262         if (!strcmp(s, "ide=doubler")) {
1263                 extern int ide_doubler;
1264
1265                 printk(" : Enabled support for IDE doublers\n");
1266                 ide_doubler = 1;
1267                 return 1;
1268         }
1269 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
1270
1271         if (!strcmp(s, "ide=nodma")) {
1272                 printk(" : Prevented DMA\n");
1273                 noautodma = 1;
1274                 goto obsolete_option;
1275         }
1276
1277 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
1278         if (!strcmp(s, "ide=reverse")) {
1279                 ide_scan_direction = 1;
1280                 printk(" : Enabled support for IDE inverse scan order.\n");
1281                 return 1;
1282         }
1283 #endif
1284
1285 #ifdef CONFIG_BLK_DEV_IDEACPI
1286         if (!strcmp(s, "ide=noacpi")) {
1287                 //printk(" : Disable IDE ACPI support.\n");
1288                 ide_noacpi = 1;
1289                 return 1;
1290         }
1291         if (!strcmp(s, "ide=acpigtf")) {
1292                 //printk(" : Enable IDE ACPI _GTF support.\n");
1293                 ide_noacpitfs = 0;
1294                 return 1;
1295         }
1296         if (!strcmp(s, "ide=acpionboot")) {
1297                 //printk(" : Call IDE ACPI methods on boot.\n");
1298                 ide_noacpionboot = 0;
1299                 return 1;
1300         }
1301 #endif /* CONFIG_BLK_DEV_IDEACPI */
1302
1303         /*
1304          * Look for drive options:  "hdx="
1305          */
1306         if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
1307                 const char *hd_words[] = {
1308                         "none", "noprobe", "nowerr", "cdrom", "nodma",
1309                         "autotune", "noautotune", "-8", "-9", "-10",
1310                         "noflush", "remap", "remap63", "scsi", NULL };
1311                 unit = s[2] - 'a';
1312                 hw   = unit / MAX_DRIVES;
1313                 unit = unit % MAX_DRIVES;
1314                 hwif = &ide_hwifs[hw];
1315                 drive = &hwif->drives[unit];
1316                 if (strncmp(s + 4, "ide-", 4) == 0) {
1317                         strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
1318                         goto done;
1319                 }
1320                 switch (match_parm(&s[3], hd_words, vals, 3)) {
1321                         case -1: /* "none" */
1322                         case -2: /* "noprobe" */
1323                                 drive->noprobe = 1;
1324                                 goto done;
1325                         case -3: /* "nowerr" */
1326                                 drive->bad_wstat = BAD_R_STAT;
1327                                 hwif->noprobe = 0;
1328                                 goto done;
1329                         case -4: /* "cdrom" */
1330                                 drive->present = 1;
1331                                 drive->media = ide_cdrom;
1332                                 /* an ATAPI device ignores DRDY */
1333                                 drive->ready_stat = 0;
1334                                 hwif->noprobe = 0;
1335                                 goto done;
1336                         case -5: /* nodma */
1337                                 drive->nodma = 1;
1338                                 goto done;
1339                         case -6: /* "autotune" */
1340                                 drive->autotune = IDE_TUNE_AUTO;
1341                                 goto obsolete_option;
1342                         case -7: /* "noautotune" */
1343                                 drive->autotune = IDE_TUNE_NOAUTO;
1344                                 goto obsolete_option;
1345                         case -11: /* noflush */
1346                                 drive->noflush = 1;
1347                                 goto done;
1348                         case -12: /* "remap" */
1349                                 drive->remap_0_to_1 = 1;
1350                                 goto done;
1351                         case -13: /* "remap63" */
1352                                 drive->sect0 = 63;
1353                                 goto done;
1354                         case -14: /* "scsi" */
1355                                 drive->scsi = 1;
1356                                 goto done;
1357                         case 3: /* cyl,head,sect */
1358                                 drive->media    = ide_disk;
1359                                 drive->ready_stat = READY_STAT;
1360                                 drive->cyl      = drive->bios_cyl  = vals[0];
1361                                 drive->head     = drive->bios_head = vals[1];
1362                                 drive->sect     = drive->bios_sect = vals[2];
1363                                 drive->present  = 1;
1364                                 drive->forced_geom = 1;
1365                                 hwif->noprobe = 0;
1366                                 goto done;
1367                         default:
1368                                 goto bad_option;
1369                 }
1370         }
1371
1372         if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
1373                 goto bad_option;
1374         /*
1375          * Look for bus speed option:  "idebus="
1376          */
1377         if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
1378                 if (match_parm(&s[6], NULL, vals, 1) != 1)
1379                         goto bad_option;
1380                 if (vals[0] >= 20 && vals[0] <= 66) {
1381                         idebus_parameter = vals[0];
1382                 } else
1383                         printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
1384                 goto done;
1385         }
1386         /*
1387          * Look for interface options:  "idex="
1388          */
1389         if (s[3] >= '0' && s[3] <= max_hwif) {
1390                 /*
1391                  * Be VERY CAREFUL changing this: note hardcoded indexes below
1392                  * (-8, -9, -10) are reserved to ease the hardcoding.
1393                  */
1394                 static const char *ide_words[] = {
1395                         "noprobe", "serialize", "minus3", "minus4",
1396                         "reset", "minus6", "ata66", "minus8", "minus9",
1397                         "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
1398                         "dtc2278", "umc8672", "ali14xx", NULL };
1399
1400                 hw_regs_t hwregs;
1401
1402                 hw = s[3] - '0';
1403                 hwif = &ide_hwifs[hw];
1404                 i = match_parm(&s[4], ide_words, vals, 3);
1405
1406                 /*
1407                  * Cryptic check to ensure chipset not already set for hwif.
1408                  * Note: we can't depend on hwif->chipset here.
1409                  */
1410                 if ((i >= -18 && i <= -11) || (i > 0 && i <= 3)) {
1411                         /* chipset already specified */
1412                         if (is_chipset_set[hw])
1413                                 goto bad_option;
1414                         if (i > -18 && i <= -11) {
1415                                 /* these drivers are for "ide0=" only */
1416                                 if (hw != 0)
1417                                         goto bad_hwif;
1418                                 /* chipset already specified for 2nd port */
1419                                 if (is_chipset_set[hw+1])
1420                                         goto bad_option;
1421                         }
1422                         is_chipset_set[hw] = 1;
1423                         printk("\n");
1424                 }
1425
1426                 switch (i) {
1427 #ifdef CONFIG_BLK_DEV_ALI14XX
1428                         case -17: /* "ali14xx" */
1429                                 probe_ali14xx = 1;
1430                                 goto done;
1431 #endif
1432 #ifdef CONFIG_BLK_DEV_UMC8672
1433                         case -16: /* "umc8672" */
1434                                 probe_umc8672 = 1;
1435                                 goto done;
1436 #endif
1437 #ifdef CONFIG_BLK_DEV_DTC2278
1438                         case -15: /* "dtc2278" */
1439                                 probe_dtc2278 = 1;
1440                                 goto done;
1441 #endif
1442 #ifdef CONFIG_BLK_DEV_CMD640
1443                         case -14: /* "cmd640_vlb" */
1444                                 cmd640_vlb = 1;
1445                                 goto done;
1446 #endif
1447 #ifdef CONFIG_BLK_DEV_HT6560B
1448                         case -13: /* "ht6560b" */
1449                                 probe_ht6560b = 1;
1450                                 goto done;
1451 #endif
1452 #ifdef CONFIG_BLK_DEV_QD65XX
1453                         case -12: /* "qd65xx" */
1454                                 probe_qd65xx = 1;
1455                                 goto done;
1456 #endif
1457 #ifdef CONFIG_BLK_DEV_4DRIVES
1458                         case -11: /* "four" drives on one set of ports */
1459                         {
1460                                 ide_hwif_t *mate = &ide_hwifs[hw^1];
1461                                 mate->drives[0].select.all ^= 0x20;
1462                                 mate->drives[1].select.all ^= 0x20;
1463                                 hwif->chipset = mate->chipset = ide_4drives;
1464                                 mate->irq = hwif->irq;
1465                                 memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
1466                                 hwif->mate = mate;
1467                                 mate->mate = hwif;
1468                                 hwif->serialized = mate->serialized = 1;
1469                                 goto obsolete_option;
1470                         }
1471 #endif /* CONFIG_BLK_DEV_4DRIVES */
1472                         case -10: /* minus10 */
1473                         case -9: /* minus9 */
1474                         case -8: /* minus8 */
1475                         case -6:
1476                         case -4:
1477                         case -3:
1478                                 goto bad_option;
1479                         case -7: /* ata66 */
1480 #ifdef CONFIG_BLK_DEV_IDEPCI
1481                                 /*
1482                                  * Use ATA_CBL_PATA40_SHORT so drive side
1483                                  * cable detection is also overriden.
1484                                  */
1485                                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1486                                 goto obsolete_option;
1487 #else
1488                                 goto bad_hwif;
1489 #endif
1490                         case -5: /* "reset" */
1491                                 hwif->reset = 1;
1492                                 goto obsolete_option;
1493                         case -2: /* "serialize" */
1494                                 hwif->mate = &ide_hwifs[hw^1];
1495                                 hwif->mate->mate = hwif;
1496                                 hwif->serialized = hwif->mate->serialized = 1;
1497                                 goto obsolete_option;
1498
1499                         case -1: /* "noprobe" */
1500                                 hwif->noprobe = 1;
1501                                 goto done;
1502
1503                         case 1: /* base */
1504                                 vals[1] = vals[0] + 0x206; /* default ctl */
1505                         case 2: /* base,ctl */
1506                                 vals[2] = 0;    /* default irq = probe for it */
1507                         case 3: /* base,ctl,irq */
1508                                 memset(&hwregs, 0, sizeof(hwregs));
1509                                 ide_init_hwif_ports(&hwregs, vals[0], vals[1], &hwif->irq);
1510                                 memcpy(hwif->io_ports, hwregs.io_ports, sizeof(hwif->io_ports));
1511                                 hwif->irq      = vals[2];
1512                                 hwif->noprobe  = 0;
1513                                 hwif->chipset  = ide_forced;
1514                                 goto obsolete_option;
1515
1516                         case 0: goto bad_option;
1517                         default:
1518                                 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
1519                                 return 1;
1520                 }
1521         }
1522 bad_option:
1523         printk(" -- BAD OPTION\n");
1524         return 1;
1525 obsolete_option:
1526         printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
1527         return 1;
1528 bad_hwif:
1529         printk("-- NOT SUPPORTED ON ide%d", hw);
1530 done:
1531         printk("\n");
1532         return 1;
1533 }
1534
1535 EXPORT_SYMBOL(ide_lock);
1536
1537 static int ide_bus_match(struct device *dev, struct device_driver *drv)
1538 {
1539         return 1;
1540 }
1541
1542 static char *media_string(ide_drive_t *drive)
1543 {
1544         switch (drive->media) {
1545         case ide_disk:
1546                 return "disk";
1547         case ide_cdrom:
1548                 return "cdrom";
1549         case ide_tape:
1550                 return "tape";
1551         case ide_floppy:
1552                 return "floppy";
1553         case ide_optical:
1554                 return "optical";
1555         default:
1556                 return "UNKNOWN";
1557         }
1558 }
1559
1560 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
1561 {
1562         ide_drive_t *drive = to_ide_device(dev);
1563         return sprintf(buf, "%s\n", media_string(drive));
1564 }
1565
1566 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
1567 {
1568         ide_drive_t *drive = to_ide_device(dev);
1569         return sprintf(buf, "%s\n", drive->name);
1570 }
1571
1572 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1573 {
1574         ide_drive_t *drive = to_ide_device(dev);
1575         return sprintf(buf, "ide:m-%s\n", media_string(drive));
1576 }
1577
1578 static ssize_t model_show(struct device *dev, struct device_attribute *attr,
1579                           char *buf)
1580 {
1581         ide_drive_t *drive = to_ide_device(dev);
1582         return sprintf(buf, "%s\n", drive->id->model);
1583 }
1584
1585 static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
1586                              char *buf)
1587 {
1588         ide_drive_t *drive = to_ide_device(dev);
1589         return sprintf(buf, "%s\n", drive->id->fw_rev);
1590 }
1591
1592 static ssize_t serial_show(struct device *dev, struct device_attribute *attr,
1593                            char *buf)
1594 {
1595         ide_drive_t *drive = to_ide_device(dev);
1596         return sprintf(buf, "%s\n", drive->id->serial_no);
1597 }
1598
1599 static struct device_attribute ide_dev_attrs[] = {
1600         __ATTR_RO(media),
1601         __ATTR_RO(drivename),
1602         __ATTR_RO(modalias),
1603         __ATTR_RO(model),
1604         __ATTR_RO(firmware),
1605         __ATTR(serial, 0400, serial_show, NULL),
1606         __ATTR_NULL
1607 };
1608
1609 static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
1610 {
1611         ide_drive_t *drive = to_ide_device(dev);
1612
1613         add_uevent_var(env, "MEDIA=%s", media_string(drive));
1614         add_uevent_var(env, "DRIVENAME=%s", drive->name);
1615         add_uevent_var(env, "MODALIAS=ide:m-%s", media_string(drive));
1616         return 0;
1617 }
1618
1619 static int generic_ide_probe(struct device *dev)
1620 {
1621         ide_drive_t *drive = to_ide_device(dev);
1622         ide_driver_t *drv = to_ide_driver(dev->driver);
1623
1624         return drv->probe ? drv->probe(drive) : -ENODEV;
1625 }
1626
1627 static int generic_ide_remove(struct device *dev)
1628 {
1629         ide_drive_t *drive = to_ide_device(dev);
1630         ide_driver_t *drv = to_ide_driver(dev->driver);
1631
1632         if (drv->remove)
1633                 drv->remove(drive);
1634
1635         return 0;
1636 }
1637
1638 static void generic_ide_shutdown(struct device *dev)
1639 {
1640         ide_drive_t *drive = to_ide_device(dev);
1641         ide_driver_t *drv = to_ide_driver(dev->driver);
1642
1643         if (dev->driver && drv->shutdown)
1644                 drv->shutdown(drive);
1645 }
1646
1647 struct bus_type ide_bus_type = {
1648         .name           = "ide",
1649         .match          = ide_bus_match,
1650         .uevent         = ide_uevent,
1651         .probe          = generic_ide_probe,
1652         .remove         = generic_ide_remove,
1653         .shutdown       = generic_ide_shutdown,
1654         .dev_attrs      = ide_dev_attrs,
1655         .suspend        = generic_ide_suspend,
1656         .resume         = generic_ide_resume,
1657 };
1658
1659 EXPORT_SYMBOL_GPL(ide_bus_type);
1660
1661 /*
1662  * This is gets invoked once during initialization, to set *everything* up
1663  */
1664 static int __init ide_init(void)
1665 {
1666         int ret;
1667
1668         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver " REVISION "\n");
1669         system_bus_speed = ide_system_bus_speed();
1670
1671         ret = bus_register(&ide_bus_type);
1672         if (ret < 0) {
1673                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1674                 return ret;
1675         }
1676
1677         init_ide_data();
1678
1679         proc_ide_create();
1680
1681         return 0;
1682 }
1683
1684 #ifdef MODULE
1685 static char *options = NULL;
1686 module_param(options, charp, 0);
1687 MODULE_LICENSE("GPL");
1688
1689 static void __init parse_options (char *line)
1690 {
1691         char *next = line;
1692
1693         if (line == NULL || !*line)
1694                 return;
1695         while ((line = next) != NULL) {
1696                 if ((next = strchr(line,' ')) != NULL)
1697                         *next++ = 0;
1698                 if (!ide_setup(line))
1699                         printk (KERN_INFO "Unknown option '%s'\n", line);
1700         }
1701 }
1702
1703 int __init init_module (void)
1704 {
1705         parse_options(options);
1706         return ide_init();
1707 }
1708
1709 void __exit cleanup_module (void)
1710 {
1711         int index;
1712
1713         for (index = 0; index < MAX_HWIFS; ++index)
1714                 ide_unregister(index);
1715
1716         proc_ide_destroy();
1717
1718         bus_unregister(&ide_bus_type);
1719 }
1720
1721 #else /* !MODULE */
1722
1723 __setup("", ide_setup);
1724
1725 module_init(ide_init);
1726
1727 #endif /* MODULE */