drivers/ide/ide.c

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