drivers/ide/ide.c

   1 /*
   2  *  linux/drivers/ide/ide.c             Version 7.00beta2       Mar 05 2003
   3  *
   4  *  Copyright (C) 1994-1998  Linus Torvalds & authors (see below)
   5  */
   6
   7 /*
   8  *  Mostly written by Mark Lord  <mlord@pobox.com>
   9  *                and Gadi Oxman <gadio@netvision.net.il>
  10  *                and Andre Hedrick <andre@linux-ide.org>
  11  *
  12  *  See linux/MAINTAINERS for address of current maintainer.
  13  *
  14  * This is the multiple IDE interface driver, as evolved from hd.c.
  15  * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
  16  *   (usually 14 & 15).
  17  * There can be up to two drives per interface, as per the ATA-2 spec.
  18  *
  19  * ...
  20  *
  21  *  From hd.c:
  22  *  |
  23  *  | It traverses the request-list, using interrupts to jump between functions.
  24  *  | As nearly all functions can be called within interrupts, we may not sleep.
  25  *  | Special care is recommended.  Have Fun!
  26  *  |
  27  *  | modified by Drew Eckhardt to check nr of hd's from the CMOS.
  28  *  |
  29  *  | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
  30  *  | in the early extended-partition checks and added DM partitions.
  31  *  |
  32  *  | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
  33  *  |
  34  *  | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
  35  *  | and general streamlining by Mark Lord (mlord@pobox.com).
  36  *
  37  *  October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
  38  *
  39  *      Mark Lord       (mlord@pobox.com)               (IDE Perf.Pkg)
  40  *      Delman Lee      (delman@ieee.org)               ("Mr. atdisk2")
  41  *      Scott Snyder    (snyder@fnald0.fnal.gov)        (ATAPI IDE cd-rom)
  42  *
  43  *  This was a rewrite of just about everything from hd.c, though some original
  44  *  code is still sprinkled about.  Think of it as a major evolution, with
  45  *  inspiration from lots of linux users, esp.  hamish@zot.apana.org.au
  46  */
  47
  48 #define REVISION        "Revision: 7.00alpha2"
  49 #define VERSION         "Id: ide.c 7.00a2 20020906"
  50
  51 #define _IDE_C                  /* Tell ide.h it's really us */
  52
  53 #include <linux/module.h>
  54 #include <linux/types.h>
  55 #include <linux/string.h>
  56 #include <linux/kernel.h>
  57 #include <linux/timer.h>
  58 #include <linux/mm.h>
  59 #include <linux/interrupt.h>
  60 #include <linux/major.h>
  61 #include <linux/errno.h>
  62 #include <linux/genhd.h>
  63 #include <linux/blkpg.h>
  64 #include <linux/slab.h>
  65 #include <linux/init.h>
  66 #include <linux/pci.h>
  67 #include <linux/delay.h>
  68 #include <linux/ide.h>
  69 #include <linux/completion.h>
  70 #include <linux/reboot.h>
  71 #include <linux/cdrom.h>
  72 #include <linux/seq_file.h>
  73 #include <linux/device.h>
  74 #include <linux/bitops.h>
  75
  76 #include <asm/byteorder.h>
  77 #include <asm/irq.h>
  78 #include <asm/uaccess.h>
  79 #include <asm/io.h>
  80
  81
  82 /* default maximum number of failures */
  83 #define IDE_DEFAULT_MAX_FAILURES        1
  84
  85 static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
  86                                         IDE2_MAJOR, IDE3_MAJOR,
  87                                         IDE4_MAJOR, IDE5_MAJOR,
  88                                         IDE6_MAJOR, IDE7_MAJOR,
  89                                         IDE8_MAJOR, IDE9_MAJOR };
  90
  91 static int idebus_parameter;    /* holds the "idebus=" parameter */
  92 static int system_bus_speed;    /* holds what we think is VESA/PCI bus speed */
  93
  94 DEFINE_MUTEX(ide_cfg_mtx);
  95  __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
  96
  97 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
  98 static int ide_scan_direction; /* THIS was formerly 2.2.x pci=reverse */
  99 #endif
 100
 101 int noautodma = 0;
 102
 103 EXPORT_SYMBOL(noautodma);
 104
 105 #ifdef CONFIG_BLK_DEV_IDEACPI
 106 int ide_noacpi = 0;
 107 int ide_noacpitfs = 1;
 108 int ide_noacpionboot = 1;
 109 #endif
 110
 111 /*
 112  * This is declared extern in ide.h, for access by other IDE modules:
 113  */
 114 ide_hwif_t ide_hwifs[MAX_HWIFS];        /* master data repository */
 115
 116 EXPORT_SYMBOL(ide_hwifs);
 117
 118 /*
 119  * Do not even *think* about calling this!
 120  */
 121 static void init_hwif_data(ide_hwif_t *hwif, unsigned int index)
 122 {
 123         unsigned int unit;
 124
 125         /* bulk initialize hwif & drive info with zeros */
 126         memset(hwif, 0, sizeof(ide_hwif_t));
 127
 128         /* fill in any non-zero initial values */
 129         hwif->index     = index;
 130         hwif->major     = ide_hwif_to_major[index];
 131
 132         hwif->name[0]   = 'i';
 133         hwif->name[1]   = 'd';
 134         hwif->name[2]   = 'e';
 135         hwif->name[3]   = '0' + index;
 136
 137         hwif->bus_state = BUSSTATE_ON;
 138
 139         hwif->atapi_dma = 0;            /* disable all atapi dma */
 140
 141         init_completion(&hwif->gendev_rel_comp);
 142
 143         default_hwif_iops(hwif);
 144         default_hwif_transport(hwif);
 145         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 146                 ide_drive_t *drive = &hwif->drives[unit];
 147
 148                 drive->media                    = ide_disk;
 149                 drive->select.all               = (unit<<4)|0xa0;
 150                 drive->hwif                     = hwif;
 151                 drive->ctl                      = 0x08;
 152                 drive->ready_stat               = READY_STAT;
 153                 drive->bad_wstat                = BAD_W_STAT;
 154                 drive->special.b.recalibrate    = 1;
 155                 drive->special.b.set_geometry   = 1;
 156                 drive->name[0]                  = 'h';
 157                 drive->name[1]                  = 'd';
 158                 drive->name[2]                  = 'a' + (index * MAX_DRIVES) + unit;
 159                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
 160                 drive->using_dma                = 0;
 161                 drive->vdma                     = 0;
 162                 INIT_LIST_HEAD(&drive->list);
 163                 init_completion(&drive->gendev_rel_comp);
 164         }
 165 }
 166
 167 static void init_hwif_default(ide_hwif_t *hwif, unsigned int index)
 168 {
 169         hw_regs_t hw;
 170
 171         memset(&hw, 0, sizeof(hw_regs_t));
 172
 173         ide_init_hwif_ports(&hw, ide_default_io_base(index), 0, &hwif->irq);
 174
 175         memcpy(&hwif->hw, &hw, sizeof(hw));
 176         memcpy(hwif->io_ports, hw.io_ports, sizeof(hw.io_ports));
 177
 178         hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
 179 #ifdef CONFIG_BLK_DEV_HD
 180         if (hwif->io_ports[IDE_DATA_OFFSET] == HD_DATA)
 181                 hwif->noprobe = 1;      /* may be overridden by ide_setup() */
 182 #endif
 183 }
 184
 185 extern void ide_arm_init(void);
 186
 187 /*
 188  * init_ide_data() sets reasonable default values into all fields
 189  * of all instances of the hwifs and drives, but only on the first call.
 190  * Subsequent calls have no effect (they don't wipe out anything).
 191  *
 192  * This routine is normally called at driver initialization time,
 193  * but may also be called MUCH earlier during kernel "command-line"
 194  * parameter processing.  As such, we cannot depend on any other parts
 195  * of the kernel (such as memory allocation) to be functioning yet.
 196  *
 197  * This is too bad, as otherwise we could dynamically allocate the
 198  * ide_drive_t structs as needed, rather than always consuming memory
 199  * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
 200  *
 201  * FIXME: We should stuff the setup data into __init and copy the
 202  * relevant hwifs/allocate them properly during boot.
 203  */
 204 #define MAGIC_COOKIE 0x12345678
 205 static void __init init_ide_data (void)
 206 {
 207         ide_hwif_t *hwif;
 208         unsigned int index;
 209         static unsigned long magic_cookie = MAGIC_COOKIE;
 210
 211         if (magic_cookie != MAGIC_COOKIE)
 212                 return;         /* already initialized */
 213         magic_cookie = 0;
 214
 215         /* Initialise all interface structures */
 216         for (index = 0; index < MAX_HWIFS; ++index) {
 217                 hwif = &ide_hwifs[index];
 218                 init_hwif_data(hwif, index);
 219                 init_hwif_default(hwif, index);
 220 #if !defined(CONFIG_PPC32) || !defined(CONFIG_PCI)
 221                 hwif->irq = hwif->hw.irq =
 222                         ide_init_default_irq(hwif->io_ports[IDE_DATA_OFFSET]);
 223 #endif
 224         }
 225 #ifdef CONFIG_IDE_ARM
 226         ide_arm_init();
 227 #endif
 228 }
 229
 230 /**
 231  *      ide_system_bus_speed    -       guess bus speed
 232  *
 233  *      ide_system_bus_speed() returns what we think is the system VESA/PCI
 234  *      bus speed (in MHz). This is used for calculating interface PIO timings.
 235  *      The default is 40 for known PCI systems, 50 otherwise.
 236  *      The "idebus=xx" parameter can be used to override this value.
 237  *      The actual value to be used is computed/displayed the first time
 238  *      through. Drivers should only use this as a last resort.
 239  *
 240  *      Returns a guessed speed in MHz.
 241  */
 242
 243 static int ide_system_bus_speed(void)
 244 {
 245 #ifdef CONFIG_PCI
 246         static struct pci_device_id pci_default[] = {
 247                 { PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID) },
 248                 { }
 249         };
 250 #else
 251 #define pci_default 0
 252 #endif /* CONFIG_PCI */
 253
 254         if (!system_bus_speed) {
 255                 if (idebus_parameter) {
 256                         /* user supplied value */
 257                         system_bus_speed = idebus_parameter;
 258                 } else if (pci_dev_present(pci_default)) {
 259                         /* safe default value for PCI */
 260                         system_bus_speed = 33;
 261                 } else {
 262                         /* safe default value for VESA and PCI */
 263                         system_bus_speed = 50;
 264                 }
 265                 printk(KERN_INFO "ide: Assuming %dMHz system bus speed "
 266                         "for PIO modes%s\n", system_bus_speed,
 267                         idebus_parameter ? "" : "; override with idebus=xx");
 268         }
 269         return system_bus_speed;
 270 }
 271
 272 static struct resource* hwif_request_region(ide_hwif_t *hwif,
 273                                             unsigned long addr, int num)
 274 {
 275         struct resource *res = request_region(addr, num, hwif->name);
 276
 277         if (!res)
 278                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
 279                                 hwif->name, addr, addr+num-1);
 280         return res;
 281 }
 282
 283 /**
 284  *      ide_hwif_request_regions - request resources for IDE
 285  *      @hwif: interface to use
 286  *
 287  *      Requests all the needed resources for an interface.
 288  *      Right now core IDE code does this work which is deeply wrong.
 289  *      MMIO leaves it to the controller driver,
 290  *      PIO will migrate this way over time.
 291  */
 292
 293 int ide_hwif_request_regions(ide_hwif_t *hwif)
 294 {
 295         unsigned long addr;
 296         unsigned int i;
 297
 298         if (hwif->mmio)
 299                 return 0;
 300         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 301         if (addr && !hwif_request_region(hwif, addr, 1))
 302                 goto control_region_busy;
 303         hwif->straight8 = 0;
 304         addr = hwif->io_ports[IDE_DATA_OFFSET];
 305         if ((addr | 7) == hwif->io_ports[IDE_STATUS_OFFSET]) {
 306                 if (!hwif_request_region(hwif, addr, 8))
 307                         goto data_region_busy;
 308                 hwif->straight8 = 1;
 309                 return 0;
 310         }
 311         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
 312                 addr = hwif->io_ports[i];
 313                 if (!hwif_request_region(hwif, addr, 1)) {
 314                         while (--i)
 315                                 release_region(addr, 1);
 316                         goto data_region_busy;
 317                 }
 318         }
 319         return 0;
 320
 321 data_region_busy:
 322         addr = hwif->io_ports[IDE_CONTROL_OFFSET];
 323         if (addr)
 324                 release_region(addr, 1);
 325 control_region_busy:
 326         /* If any errors are return, we drop the hwif interface. */
 327         return -EBUSY;
 328 }
 329
 330 /**
 331  *      ide_hwif_release_regions - free IDE resources
 332  *
 333  *      Note that we only release the standard ports,
 334  *      and do not even try to handle any extra ports
 335  *      allocated for weird IDE interface chipsets.
 336  *
 337  *      Note also that we don't yet handle mmio resources here. More
 338  *      importantly our caller should be doing this so we need to
 339  *      restructure this as a helper function for drivers.
 340  */
 341
 342 void ide_hwif_release_regions(ide_hwif_t *hwif)
 343 {
 344         u32 i = 0;
 345
 346         if (hwif->mmio)
 347                 return;
 348         if (hwif->io_ports[IDE_CONTROL_OFFSET])
 349                 release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
 350         if (hwif->straight8) {
 351                 release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
 352                 return;
 353         }
 354         for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
 355                 if (hwif->io_ports[i])
 356                         release_region(hwif->io_ports[i], 1);
 357 }
 358
 359 /**
 360  *      ide_hwif_restore        -       restore hwif to template
 361  *      @hwif: hwif to update
 362  *      @tmp_hwif: template
 363  *
 364  *      Restore hwif to a previous state by copying most settings
 365  *      from the template.
 366  */
 367
 368 static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
 369 {
 370         hwif->hwgroup                   = tmp_hwif->hwgroup;
 371
 372         hwif->gendev.parent             = tmp_hwif->gendev.parent;
 373
 374         hwif->proc                      = tmp_hwif->proc;
 375
 376         hwif->major                     = tmp_hwif->major;
 377         hwif->straight8                 = tmp_hwif->straight8;
 378         hwif->bus_state                 = tmp_hwif->bus_state;
 379
 380         hwif->host_flags                = tmp_hwif->host_flags;
 381
 382         hwif->pio_mask                  = tmp_hwif->pio_mask;
 383
 384         hwif->atapi_dma                 = tmp_hwif->atapi_dma;
 385         hwif->ultra_mask                = tmp_hwif->ultra_mask;
 386         hwif->mwdma_mask                = tmp_hwif->mwdma_mask;
 387         hwif->swdma_mask                = tmp_hwif->swdma_mask;
 388
 389         hwif->cbl                       = tmp_hwif->cbl;
 390
 391         hwif->chipset                   = tmp_hwif->chipset;
 392         hwif->hold                      = tmp_hwif->hold;
 393
 394 #ifdef CONFIG_BLK_DEV_IDEPCI
 395         hwif->pci_dev                   = tmp_hwif->pci_dev;
 396         hwif->cds                       = tmp_hwif->cds;
 397 #endif
 398
 399         hwif->tuneproc                  = tmp_hwif->tuneproc;
 400         hwif->speedproc                 = tmp_hwif->speedproc;
 401         hwif->udma_filter               = tmp_hwif->udma_filter;
 402         hwif->selectproc                = tmp_hwif->selectproc;
 403         hwif->reset_poll                = tmp_hwif->reset_poll;
 404         hwif->pre_reset                 = tmp_hwif->pre_reset;
 405         hwif->resetproc                 = tmp_hwif->resetproc;
 406         hwif->intrproc                  = tmp_hwif->intrproc;
 407         hwif->maskproc                  = tmp_hwif->maskproc;
 408         hwif->quirkproc                 = tmp_hwif->quirkproc;
 409         hwif->busproc                   = tmp_hwif->busproc;
 410
 411         hwif->ata_input_data            = tmp_hwif->ata_input_data;
 412         hwif->ata_output_data           = tmp_hwif->ata_output_data;
 413         hwif->atapi_input_bytes         = tmp_hwif->atapi_input_bytes;
 414         hwif->atapi_output_bytes        = tmp_hwif->atapi_output_bytes;
 415
 416         hwif->dma_setup                 = tmp_hwif->dma_setup;
 417         hwif->dma_exec_cmd              = tmp_hwif->dma_exec_cmd;
 418         hwif->dma_start                 = tmp_hwif->dma_start;
 419         hwif->ide_dma_end               = tmp_hwif->ide_dma_end;
 420         hwif->ide_dma_check             = tmp_hwif->ide_dma_check;
 421         hwif->ide_dma_on                = tmp_hwif->ide_dma_on;
 422         hwif->dma_off_quietly           = tmp_hwif->dma_off_quietly;
 423         hwif->ide_dma_test_irq          = tmp_hwif->ide_dma_test_irq;
 424         hwif->ide_dma_clear_irq         = tmp_hwif->ide_dma_clear_irq;
 425         hwif->dma_host_on               = tmp_hwif->dma_host_on;
 426         hwif->dma_host_off              = tmp_hwif->dma_host_off;
 427         hwif->dma_lost_irq              = tmp_hwif->dma_lost_irq;
 428         hwif->dma_timeout               = tmp_hwif->dma_timeout;
 429
 430         hwif->OUTB                      = tmp_hwif->OUTB;
 431         hwif->OUTBSYNC                  = tmp_hwif->OUTBSYNC;
 432         hwif->OUTW                      = tmp_hwif->OUTW;
 433         hwif->OUTSW                     = tmp_hwif->OUTSW;
 434         hwif->OUTSL                     = tmp_hwif->OUTSL;
 435
 436         hwif->INB                       = tmp_hwif->INB;
 437         hwif->INW                       = tmp_hwif->INW;
 438         hwif->INSW                      = tmp_hwif->INSW;
 439         hwif->INSL                      = tmp_hwif->INSL;
 440
 441         hwif->sg_max_nents              = tmp_hwif->sg_max_nents;
 442
 443         hwif->mmio                      = tmp_hwif->mmio;
 444         hwif->rqsize                    = tmp_hwif->rqsize;
 445         hwif->no_lba48                  = tmp_hwif->no_lba48;
 446
 447 #ifndef CONFIG_BLK_DEV_IDECS
 448         hwif->irq                       = tmp_hwif->irq;
 449 #endif
 450
 451         hwif->dma_base                  = tmp_hwif->dma_base;
 452         hwif->dma_master                = tmp_hwif->dma_master;
 453         hwif->dma_command               = tmp_hwif->dma_command;
 454         hwif->dma_vendor1               = tmp_hwif->dma_vendor1;
 455         hwif->dma_status                = tmp_hwif->dma_status;
 456         hwif->dma_vendor3               = tmp_hwif->dma_vendor3;
 457         hwif->dma_prdtable              = tmp_hwif->dma_prdtable;
 458
 459         hwif->config_data               = tmp_hwif->config_data;
 460         hwif->select_data               = tmp_hwif->select_data;
 461         hwif->extra_base                = tmp_hwif->extra_base;
 462         hwif->extra_ports               = tmp_hwif->extra_ports;
 463         hwif->autodma                   = tmp_hwif->autodma;
 464
 465         hwif->hwif_data                 = tmp_hwif->hwif_data;
 466 }
 467
 468 /**
 469  *      ide_unregister          -       free an IDE interface
 470  *      @index: index of interface (will change soon to a pointer)
 471  *
 472  *      Perform the final unregister of an IDE interface. At the moment
 473  *      we don't refcount interfaces so this will also get split up.
 474  *
 475  *      Locking:
 476  *      The caller must not hold the IDE locks
 477  *      The drive present/vanishing is not yet properly locked
 478  *      Take care with the callbacks. These have been split to avoid
 479  *      deadlocking the IDE layer. The shutdown callback is called
 480  *      before we take the lock and free resources. It is up to the
 481  *      caller to be sure there is no pending I/O here, and that
 482  *      the interface will not be reopened (present/vanishing locking
 483  *      isn't yet done BTW). After we commit to the final kill we
 484  *      call the cleanup callback with the ide locks held.
 485  *
 486  *      Unregister restores the hwif structures to the default state.
 487  *      This is raving bonkers.
 488  */
 489
 490 void ide_unregister(unsigned int index)
 491 {
 492         ide_drive_t *drive;
 493         ide_hwif_t *hwif, *g;
 494         static ide_hwif_t tmp_hwif; /* protected by ide_cfg_mtx */
 495         ide_hwgroup_t *hwgroup;
 496         int irq_count = 0, unit;
 497
 498         BUG_ON(index >= MAX_HWIFS);
 499
 500         BUG_ON(in_interrupt());
 501         BUG_ON(irqs_disabled());
 502         mutex_lock(&ide_cfg_mtx);
 503         spin_lock_irq(&ide_lock);
 504         hwif = &ide_hwifs[index];
 505         if (!hwif->present)
 506                 goto abort;
 507         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 508                 drive = &hwif->drives[unit];
 509                 if (!drive->present)
 510                         continue;
 511                 spin_unlock_irq(&ide_lock);
 512                 device_unregister(&drive->gendev);
 513                 wait_for_completion(&drive->gendev_rel_comp);
 514                 spin_lock_irq(&ide_lock);
 515         }
 516         hwif->present = 0;
 517
 518         spin_unlock_irq(&ide_lock);
 519
 520         ide_proc_unregister_port(hwif);
 521
 522         hwgroup = hwif->hwgroup;
 523         /*
 524          * free the irq if we were the only hwif using it
 525          */
 526         g = hwgroup->hwif;
 527         do {
 528                 if (g->irq == hwif->irq)
 529                         ++irq_count;
 530                 g = g->next;
 531         } while (g != hwgroup->hwif);
 532         if (irq_count == 1)
 533                 free_irq(hwif->irq, hwgroup);
 534
 535         spin_lock_irq(&ide_lock);
 536         /*
 537          * Note that we only release the standard ports,
 538          * and do not even try to handle any extra ports
 539          * allocated for weird IDE interface chipsets.
 540          */
 541         ide_hwif_release_regions(hwif);
 542
 543         /*
 544          * Remove us from the hwgroup, and free
 545          * the hwgroup if we were the only member
 546          */
 547         if (hwif->next == hwif) {
 548                 BUG_ON(hwgroup->hwif != hwif);
 549                 kfree(hwgroup);
 550         } else {
 551                 /* There is another interface in hwgroup.
 552                  * Unlink us, and set hwgroup->drive and ->hwif to
 553                  * something sane.
 554                  */
 555                 g = hwgroup->hwif;
 556                 while (g->next != hwif)
 557                         g = g->next;
 558                 g->next = hwif->next;
 559                 if (hwgroup->hwif == hwif) {
 560                         /* Chose a random hwif for hwgroup->hwif.
 561                          * It's guaranteed that there are no drives
 562                          * left in the hwgroup.
 563                          */
 564                         BUG_ON(hwgroup->drive != NULL);
 565                         hwgroup->hwif = g;
 566                 }
 567                 BUG_ON(hwgroup->hwif == hwif);
 568         }
 569
 570         /* More messed up locking ... */
 571         spin_unlock_irq(&ide_lock);
 572         device_unregister(&hwif->gendev);
 573         wait_for_completion(&hwif->gendev_rel_comp);
 574
 575         /*
 576          * Remove us from the kernel's knowledge
 577          */
 578         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
 579         kfree(hwif->sg_table);
 580         unregister_blkdev(hwif->major, hwif->name);
 581         spin_lock_irq(&ide_lock);
 582
 583         if (hwif->dma_base) {
 584                 (void) ide_release_dma(hwif);
 585
 586                 hwif->dma_base = 0;
 587                 hwif->dma_master = 0;
 588                 hwif->dma_command = 0;
 589                 hwif->dma_vendor1 = 0;
 590                 hwif->dma_status = 0;
 591                 hwif->dma_vendor3 = 0;
 592                 hwif->dma_prdtable = 0;
 593
 594                 hwif->extra_base  = 0;
 595                 hwif->extra_ports = 0;
 596         }
 597
 598         /* copy original settings */
 599         tmp_hwif = *hwif;
 600
 601         /* restore hwif data to pristine status */
 602         init_hwif_data(hwif, index);
 603         init_hwif_default(hwif, index);
 604
 605         ide_hwif_restore(hwif, &tmp_hwif);
 606
 607 abort:
 608         spin_unlock_irq(&ide_lock);
 609         mutex_unlock(&ide_cfg_mtx);
 610 }
 611
 612 EXPORT_SYMBOL(ide_unregister);
 613
 614
 615 /**
 616  *      ide_setup_ports         -       set up IDE interface ports
 617  *      @hw: register descriptions
 618  *      @base: base register
 619  *      @offsets: table of register offsets
 620  *      @ctrl: control register
 621  *      @ack_irq: IRQ ack
 622  *      @irq: interrupt lie
 623  *
 624  *      Setup hw_regs_t structure described by parameters.  You
 625  *      may set up the hw structure yourself OR use this routine to
 626  *      do it for you. This is basically a helper
 627  *
 628  */
 629
 630 void ide_setup_ports (  hw_regs_t *hw,
 631                         unsigned long base, int *offsets,
 632                         unsigned long ctrl, unsigned long intr,
 633                         ide_ack_intr_t *ack_intr,
 634 /*
 635  *                      ide_io_ops_t *iops,
 636  */
 637                         int irq)
 638 {
 639         int i;
 640
 641         memset(hw, 0, sizeof(hw_regs_t));
 642         for (i = 0; i < IDE_NR_PORTS; i++) {
 643                 if (offsets[i] == -1) {
 644                         switch(i) {
 645                                 case IDE_CONTROL_OFFSET:
 646                                         hw->io_ports[i] = ctrl;
 647                                         break;
 648 #if defined(CONFIG_AMIGA) || defined(CONFIG_MAC)
 649                                 case IDE_IRQ_OFFSET:
 650                                         hw->io_ports[i] = intr;
 651                                         break;
 652 #endif /* (CONFIG_AMIGA) || (CONFIG_MAC) */
 653                                 default:
 654                                         hw->io_ports[i] = 0;
 655                                         break;
 656                         }
 657                 } else {
 658                         hw->io_ports[i] = base + offsets[i];
 659                 }
 660         }
 661         hw->irq = irq;
 662         hw->dma = NO_DMA;
 663         hw->ack_intr = ack_intr;
 664 /*
 665  *      hw->iops = iops;
 666  */
 667 }
 668
 669 /**
 670  *      ide_register_hw_with_fixup      -       register IDE interface
 671  *      @hw: hardware registers
 672  *      @initializing: set while initializing built-in drivers
 673  *      @hwifp: pointer to returned hwif
 674  *      @fixup: fixup function
 675  *
 676  *      Register an IDE interface, specifying exactly the registers etc.
 677  *      Set init=1 iff calling before probes have taken place.
 678  *
 679  *      Returns -1 on error.
 680  */
 681
 682 int ide_register_hw_with_fixup(hw_regs_t *hw, int initializing,
 683                                ide_hwif_t **hwifp,
 684                                void(*fixup)(ide_hwif_t *hwif))
 685 {
 686         int index, retry = 1;
 687         ide_hwif_t *hwif;
 688
 689         do {
 690                 for (index = 0; index < MAX_HWIFS; ++index) {
 691                         hwif = &ide_hwifs[index];
 692                         if (hwif->hw.io_ports[IDE_DATA_OFFSET] == hw->io_ports[IDE_DATA_OFFSET])
 693                                 goto found;
 694                 }
 695                 for (index = 0; index < MAX_HWIFS; ++index) {
 696                         hwif = &ide_hwifs[index];
 697                         if (hwif->hold)
 698                                 continue;
 699                         if ((!hwif->present && !hwif->mate && !initializing) ||
 700                             (!hwif->hw.io_ports[IDE_DATA_OFFSET] && initializing))
 701                                 goto found;
 702                 }
 703                 for (index = 0; index < MAX_HWIFS; index++)
 704                         ide_unregister(index);
 705         } while (retry--);
 706         return -1;
 707 found:
 708         if (hwif->present)
 709                 ide_unregister(index);
 710         else if (!hwif->hold) {
 711                 init_hwif_data(hwif, index);
 712                 init_hwif_default(hwif, index);
 713         }
 714         if (hwif->present)
 715                 return -1;
 716         memcpy(&hwif->hw, hw, sizeof(*hw));
 717         memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->hw.io_ports));
 718         hwif->irq = hw->irq;
 719         hwif->noprobe = 0;
 720         hwif->chipset = hw->chipset;
 721         hwif->gendev.parent = hw->dev;
 722
 723         if (!initializing) {
 724                 probe_hwif_init_with_fixup(hwif, fixup);
 725                 ide_proc_register_port(hwif);
 726         }
 727
 728         if (hwifp)
 729                 *hwifp = hwif;
 730
 731         return (initializing || hwif->present) ? index : -1;
 732 }
 733
 734 EXPORT_SYMBOL(ide_register_hw_with_fixup);
 735
 736 int ide_register_hw(hw_regs_t *hw, int initializing, ide_hwif_t **hwifp)
 737 {
 738         return ide_register_hw_with_fixup(hw, initializing, hwifp, NULL);
 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         drive->io_32bit = arg;
 793 #ifdef CONFIG_BLK_DEV_DTC2278
 794         if (HWIF(drive)->chipset == ide_dtc2278)
 795                 HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
 796 #endif /* CONFIG_BLK_DEV_DTC2278 */
 797         return 0;
 798 }
 799
 800 static int set_ksettings(ide_drive_t *drive, int arg)
 801 {
 802         if (arg < 0 || arg > 1)
 803                 return -EINVAL;
 804
 805         if (ide_spin_wait_hwgroup(drive))
 806                 return -EBUSY;
 807         drive->keep_settings = arg;
 808         spin_unlock_irq(&ide_lock);
 809
 810         return 0;
 811 }
 812
 813 int set_using_dma(ide_drive_t *drive, int arg)
 814 {
 815 #ifdef CONFIG_BLK_DEV_IDEDMA
 816         ide_hwif_t *hwif = drive->hwif;
 817         int err = -EPERM;
 818
 819         if (arg < 0 || arg > 1)
 820                 return -EINVAL;
 821
 822         if (!drive->id || !(drive->id->capability & 1))
 823                 goto out;
 824
 825         if (hwif->ide_dma_check == NULL)
 826                 goto out;
 827
 828         err = -EBUSY;
 829         if (ide_spin_wait_hwgroup(drive))
 830                 goto out;
 831         /*
 832          * set ->busy flag, unlock and let it ride
 833          */
 834         hwif->hwgroup->busy = 1;
 835         spin_unlock_irq(&ide_lock);
 836
 837         err = 0;
 838
 839         if (arg) {
 840                 hwif->dma_off_quietly(drive);
 841                 if (ide_set_dma(drive) || hwif->ide_dma_on(drive))
 842                         err = -EIO;
 843         } else
 844                 ide_dma_off(drive);
 845
 846         /*
 847          * lock, clear ->busy flag and unlock before leaving
 848          */
 849         spin_lock_irq(&ide_lock);
 850         hwif->hwgroup->busy = 0;
 851         spin_unlock_irq(&ide_lock);
 852 out:
 853         return err;
 854 #else
 855         if (arg < 0 || arg > 1)
 856                 return -EINVAL;
 857
 858         return -EPERM;
 859 #endif
 860 }
 861
 862 int set_pio_mode(ide_drive_t *drive, int arg)
 863 {
 864         struct request rq;
 865
 866         if (arg < 0 || arg > 255)
 867                 return -EINVAL;
 868
 869         if (!HWIF(drive)->tuneproc)
 870                 return -ENOSYS;
 871         if (drive->special.b.set_tune)
 872                 return -EBUSY;
 873         ide_init_drive_cmd(&rq);
 874         drive->tune_req = (u8) arg;
 875         drive->special.b.set_tune = 1;
 876         (void) ide_do_drive_cmd(drive, &rq, ide_wait);
 877         return 0;
 878 }
 879
 880 static int set_unmaskirq(ide_drive_t *drive, int arg)
 881 {
 882         if (drive->no_unmask)
 883                 return -EPERM;
 884
 885         if (arg < 0 || arg > 1)
 886                 return -EINVAL;
 887
 888         if (ide_spin_wait_hwgroup(drive))
 889                 return -EBUSY;
 890         drive->unmask = arg;
 891         spin_unlock_irq(&ide_lock);
 892
 893         return 0;
 894 }
 895
 896 /**
 897  *      system_bus_clock        -       clock guess
 898  *
 899  *      External version of the bus clock guess used by very old IDE drivers
 900  *      for things like VLB timings. Should not be used.
 901  */
 902
 903 int system_bus_clock (void)
 904 {
 905         return((int) ((!system_bus_speed) ? ide_system_bus_speed() : system_bus_speed ));
 906 }
 907
 908 EXPORT_SYMBOL(system_bus_clock);
 909
 910 static int generic_ide_suspend(struct device *dev, pm_message_t mesg)
 911 {
 912         ide_drive_t *drive = dev->driver_data;
 913         ide_hwif_t *hwif = HWIF(drive);
 914         struct request rq;
 915         struct request_pm_state rqpm;
 916         ide_task_t args;
 917
 918         /* Call ACPI _GTM only once */
 919         if (!(drive->dn % 2))
 920                 ide_acpi_get_timing(hwif);
 921
 922         memset(&rq, 0, sizeof(rq));
 923         memset(&rqpm, 0, sizeof(rqpm));
 924         memset(&args, 0, sizeof(args));
 925         rq.cmd_type = REQ_TYPE_PM_SUSPEND;
 926         rq.special = &args;
 927         rq.data = &rqpm;
 928         rqpm.pm_step = ide_pm_state_start_suspend;
 929         if (mesg.event == PM_EVENT_PRETHAW)
 930                 mesg.event = PM_EVENT_FREEZE;
 931         rqpm.pm_state = mesg.event;
 932
 933         return ide_do_drive_cmd(drive, &rq, ide_wait);
 934 }
 935
 936 static int generic_ide_resume(struct device *dev)
 937 {
 938         ide_drive_t *drive = dev->driver_data;
 939         ide_hwif_t *hwif = HWIF(drive);
 940         struct request rq;
 941         struct request_pm_state rqpm;
 942         ide_task_t args;
 943         int err;
 944
 945         /* Call ACPI _STM only once */
 946         if (!(drive->dn % 2))
 947                 ide_acpi_push_timing(hwif);
 948
 949         ide_acpi_exec_tfs(drive);
 950
 951         memset(&rq, 0, sizeof(rq));
 952         memset(&rqpm, 0, sizeof(rqpm));
 953         memset(&args, 0, sizeof(args));
 954         rq.cmd_type = REQ_TYPE_PM_RESUME;
 955         rq.special = &args;
 956         rq.data = &rqpm;
 957         rqpm.pm_step = ide_pm_state_start_resume;
 958         rqpm.pm_state = PM_EVENT_ON;
 959
 960         err = ide_do_drive_cmd(drive, &rq, ide_head_wait);
 961
 962         if (err == 0 && dev->driver) {
 963                 ide_driver_t *drv = to_ide_driver(dev->driver);
 964
 965                 if (drv->resume)
 966                         drv->resume(drive);
 967         }
 968
 969         return err;
 970 }
 971
 972 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
 973                         unsigned int cmd, unsigned long arg)
 974 {
 975         unsigned long flags;
 976         ide_driver_t *drv;
 977         void __user *p = (void __user *)arg;
 978         int err = 0, (*setfunc)(ide_drive_t *, int);
 979         u8 *val;
 980
 981         switch (cmd) {
 982         case HDIO_GET_32BIT:        val = &drive->io_32bit;      goto read_val;
 983         case HDIO_GET_KEEPSETTINGS: val = &drive->keep_settings; goto read_val;
 984         case HDIO_GET_UNMASKINTR:   val = &drive->unmask;        goto read_val;
 985         case HDIO_GET_DMA:          val = &drive->using_dma;     goto read_val;
 986         case HDIO_SET_32BIT:        setfunc = set_io_32bit;      goto set_val;
 987         case HDIO_SET_KEEPSETTINGS: setfunc = set_ksettings;     goto set_val;
 988         case HDIO_SET_PIO_MODE:     setfunc = set_pio_mode;      goto set_val;
 989         case HDIO_SET_UNMASKINTR:   setfunc = set_unmaskirq;     goto set_val;
 990         case HDIO_SET_DMA:          setfunc = set_using_dma;     goto set_val;
 991         }
 992
 993         switch (cmd) {
 994                 case HDIO_OBSOLETE_IDENTITY:
 995                 case HDIO_GET_IDENTITY:
 996                         if (bdev != bdev->bd_contains)
 997                                 return -EINVAL;
 998                         if (drive->id_read == 0)
 999                                 return -ENOMSG;
1000                         if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
1001                                 return -EFAULT;
1002                         return 0;
1003
1004                 case HDIO_GET_NICE:
1005                         return put_user(drive->dsc_overlap      <<      IDE_NICE_DSC_OVERLAP    |
1006                                         drive->atapi_overlap    <<      IDE_NICE_ATAPI_OVERLAP  |
1007                                         drive->nice0            <<      IDE_NICE_0              |
1008                                         drive->nice1            <<      IDE_NICE_1              |
1009                                         drive->nice2            <<      IDE_NICE_2,
1010                                         (long __user *) arg);
1011
1012 #ifdef CONFIG_IDE_TASK_IOCTL
1013                 case HDIO_DRIVE_TASKFILE:
1014                         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1015                                 return -EACCES;
1016                         switch(drive->media) {
1017                                 case ide_disk:
1018                                         return ide_taskfile_ioctl(drive, cmd, arg);
1019                                 default:
1020                                         return -ENOMSG;
1021                         }
1022 #endif /* CONFIG_IDE_TASK_IOCTL */
1023
1024                 case HDIO_DRIVE_CMD:
1025                         if (!capable(CAP_SYS_RAWIO))
1026                                 return -EACCES;
1027                         return ide_cmd_ioctl(drive, cmd, arg);
1028
1029                 case HDIO_DRIVE_TASK:
1030                         if (!capable(CAP_SYS_RAWIO))
1031                                 return -EACCES;
1032                         return ide_task_ioctl(drive, cmd, arg);
1033
1034                 case HDIO_SCAN_HWIF:
1035                 {
1036                         hw_regs_t hw;
1037                         int args[3];
1038                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1039                         if (copy_from_user(args, p, 3 * sizeof(int)))
1040                                 return -EFAULT;
1041                         memset(&hw, 0, sizeof(hw));
1042                         ide_init_hwif_ports(&hw, (unsigned long) args[0],
1043                                             (unsigned long) args[1], NULL);
1044                         hw.irq = args[2];
1045                         if (ide_register_hw(&hw, 0, NULL) == -1)
1046                                 return -EIO;
1047                         return 0;
1048                 }
1049                 case HDIO_UNREGISTER_HWIF:
1050                         if (!capable(CAP_SYS_RAWIO)) return -EACCES;
1051                         /* (arg > MAX_HWIFS) checked in function */
1052                         ide_unregister(arg);
1053                         return 0;
1054                 case HDIO_SET_NICE:
1055                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1056                         if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
1057                                 return -EPERM;
1058                         drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
1059                         drv = *(ide_driver_t **)bdev->bd_disk->private_data;
1060                         if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
1061                                 drive->dsc_overlap = 0;
1062                                 return -EPERM;
1063                         }
1064                         drive->nice1 = (arg >> IDE_NICE_1) & 1;
1065                         return 0;
1066                 case HDIO_DRIVE_RESET:
1067                 {
1068                         unsigned long flags;
1069                         if (!capable(CAP_SYS_ADMIN)) return -EACCES;
1070
1071                         /*
1072                          *      Abort the current command on the
1073                          *      group if there is one, taking
1074                          *      care not to allow anything else
1075                          *      to be queued and to die on the
1076                          *      spot if we miss one somehow
1077                          */
1078
1079                         spin_lock_irqsave(&ide_lock, flags);
1080
1081                         if (HWGROUP(drive)->resetting) {
1082                                 spin_unlock_irqrestore(&ide_lock, flags);
1083                                 return -EBUSY;
1084                         }
1085
1086                         ide_abort(drive, "drive reset");
1087
1088                         BUG_ON(HWGROUP(drive)->handler);
1089
1090                         /* Ensure nothing gets queued after we
1091                            drop the lock. Reset will clear the busy */
1092
1093                         HWGROUP(drive)->busy = 1;
1094                         spin_unlock_irqrestore(&ide_lock, flags);
1095                         (void) ide_do_reset(drive);
1096
1097                         return 0;
1098                 }
1099
1100                 case HDIO_GET_BUSSTATE:
1101                         if (!capable(CAP_SYS_ADMIN))
1102                                 return -EACCES;
1103                         if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
1104                                 return -EFAULT;
1105                         return 0;
1106
1107                 case HDIO_SET_BUSSTATE:
1108                         if (!capable(CAP_SYS_ADMIN))
1109                                 return -EACCES;
1110                         if (HWIF(drive)->busproc)
1111                                 return HWIF(drive)->busproc(drive, (int)arg);
1112                         return -EOPNOTSUPP;
1113                 default:
1114                         return -EINVAL;
1115         }
1116
1117 read_val:
1118         mutex_lock(&ide_setting_mtx);
1119         spin_lock_irqsave(&ide_lock, flags);
1120         err = *val;
1121         spin_unlock_irqrestore(&ide_lock, flags);
1122         mutex_unlock(&ide_setting_mtx);
1123         return err >= 0 ? put_user(err, (long __user *)arg) : err;
1124
1125 set_val:
1126         if (bdev != bdev->bd_contains)
1127                 err = -EINVAL;
1128         else {
1129                 if (!capable(CAP_SYS_ADMIN))
1130                         err = -EACCES;
1131                 else {
1132                         mutex_lock(&ide_setting_mtx);
1133                         err = setfunc(drive, arg);
1134                         mutex_unlock(&ide_setting_mtx);
1135                 }
1136         }
1137         return err;
1138 }
1139
1140 EXPORT_SYMBOL(generic_ide_ioctl);
1141
1142 /*
1143  * stridx() returns the offset of c within s,
1144  * or -1 if c is '\0' or not found within s.
1145  */
1146 static int __init stridx (const char *s, char c)
1147 {
1148         char *i = strchr(s, c);
1149         return (i && c) ? i - s : -1;
1150 }
1151
1152 /*
1153  * match_parm() does parsing for ide_setup():
1154  *
1155  * 1. the first char of s must be '='.
1156  * 2. if the remainder matches one of the supplied keywords,
1157  *     the index (1 based) of the keyword is negated and returned.
1158  * 3. if the remainder is a series of no more than max_vals numbers
1159  *     separated by commas, the numbers are saved in vals[] and a
1160  *     count of how many were saved is returned.  Base10 is assumed,
1161  *     and base16 is allowed when prefixed with "0x".
1162  * 4. otherwise, zero is returned.
1163  */
1164 static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
1165 {
1166         static const char *decimal = "0123456789";
1167         static const char *hex = "0123456789abcdef";
1168         int i, n;
1169
1170         if (*s++ == '=') {
1171                 /*
1172                  * Try matching against the supplied keywords,
1173                  * and return -(index+1) if we match one
1174                  */
1175                 if (keywords != NULL) {
1176                         for (i = 0; *keywords != NULL; ++i) {
1177                                 if (!strcmp(s, *keywords++))
1178                                         return -(i+1);
1179                         }
1180                 }
1181                 /*
1182                  * Look for a series of no more than "max_vals"
1183                  * numeric values separated by commas, in base10,
1184                  * or base16 when prefixed with "0x".
1185                  * Return a count of how many were found.
1186                  */
1187                 for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
1188                         vals[n] = i;
1189                         while ((i = stridx(decimal, *++s)) >= 0)
1190                                 vals[n] = (vals[n] * 10) + i;
1191                         if (*s == 'x' && !vals[n]) {
1192                                 while ((i = stridx(hex, *++s)) >= 0)
1193                                         vals[n] = (vals[n] * 0x10) + i;
1194                         }
1195                         if (++n == max_vals)
1196                                 break;
1197                         if (*s == ',' || *s == ';')
1198                                 ++s;
1199                 }
1200                 if (!*s)
1201                         return n;
1202         }
1203         return 0;       /* zero = nothing matched */
1204 }
1205
1206 #ifdef CONFIG_BLK_DEV_ALI14XX
1207 extern int probe_ali14xx;
1208 extern int ali14xx_init(void);
1209 #endif
1210 #ifdef CONFIG_BLK_DEV_UMC8672
1211 extern int probe_umc8672;
1212 extern int umc8672_init(void);
1213 #endif
1214 #ifdef CONFIG_BLK_DEV_DTC2278
1215 extern int probe_dtc2278;
1216 extern int dtc2278_init(void);
1217 #endif
1218 #ifdef CONFIG_BLK_DEV_HT6560B
1219 extern int probe_ht6560b;
1220 extern int ht6560b_init(void);
1221 #endif
1222 #ifdef CONFIG_BLK_DEV_QD65XX
1223 extern int probe_qd65xx;
1224 extern int qd65xx_init(void);
1225 #endif
1226
1227 static int __initdata is_chipset_set[MAX_HWIFS];
1228
1229 /*
1230  * ide_setup() gets called VERY EARLY during initialization,
1231  * to handle kernel "command line" strings beginning with "hdx=" or "ide".
1232  *
1233  * Remember to update Documentation/ide.txt if you change something here.
1234  */
1235 static int __init ide_setup(char *s)
1236 {
1237         int i, vals[3];
1238         ide_hwif_t *hwif;
1239         ide_drive_t *drive;
1240         unsigned int hw, unit;
1241         const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
1242         const char max_hwif  = '0' + (MAX_HWIFS - 1);
1243
1244
1245         if (strncmp(s,"hd",2) == 0 && s[2] == '=')      /* hd= is for hd.c   */
1246                 return 0;                               /* driver and not us */
1247
1248         if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
1249                 return 0;
1250
1251         printk(KERN_INFO "ide_setup: %s", s);
1252         init_ide_data ();
1253
1254 #ifdef CONFIG_BLK_DEV_IDEDOUBLER
1255         if (!strcmp(s, "ide=doubler")) {
1256                 extern int ide_doubler;
1257
1258                 printk(" : Enabled support for IDE doublers\n");
1259                 ide_doubler = 1;
1260                 return 1;
1261         }
1262 #endif /* CONFIG_BLK_DEV_IDEDOUBLER */
1263
1264         if (!strcmp(s, "ide=nodma")) {
1265                 printk(" : Prevented DMA\n");
1266                 noautodma = 1;
1267                 return 1;
1268         }
1269
1270 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
1271         if (!strcmp(s, "ide=reverse")) {
1272                 ide_scan_direction = 1;
1273                 printk(" : Enabled support for IDE inverse scan order.\n");
1274                 return 1;
1275         }
1276 #endif
1277
1278 #ifdef CONFIG_BLK_DEV_IDEACPI
1279         if (!strcmp(s, "ide=noacpi")) {
1280                 //printk(" : Disable IDE ACPI support.\n");
1281                 ide_noacpi = 1;
1282                 return 1;
1283         }
1284         if (!strcmp(s, "ide=acpigtf")) {
1285                 //printk(" : Enable IDE ACPI _GTF support.\n");
1286                 ide_noacpitfs = 0;
1287                 return 1;
1288         }
1289         if (!strcmp(s, "ide=acpionboot")) {
1290                 //printk(" : Call IDE ACPI methods on boot.\n");
1291                 ide_noacpionboot = 0;
1292                 return 1;
1293         }
1294 #endif /* CONFIG_BLK_DEV_IDEACPI */
1295
1296         /*
1297          * Look for drive options:  "hdx="
1298          */
1299         if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
1300                 const char *hd_words[] = {
1301                         "none", "noprobe", "nowerr", "cdrom", "minus5",
1302                         "autotune", "noautotune", "minus8", "swapdata", "bswap",
1303                         "noflush", "remap", "remap63", "scsi", NULL };
1304                 unit = s[2] - 'a';
1305                 hw   = unit / MAX_DRIVES;
1306                 unit = unit % MAX_DRIVES;
1307                 hwif = &ide_hwifs[hw];
1308                 drive = &hwif->drives[unit];
1309                 if (strncmp(s + 4, "ide-", 4) == 0) {
1310                         strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
1311                         goto done;
1312                 }
1313                 switch (match_parm(&s[3], hd_words, vals, 3)) {
1314                         case -1: /* "none" */
1315                         case -2: /* "noprobe" */
1316                                 drive->noprobe = 1;
1317                                 goto done;
1318                         case -3: /* "nowerr" */
1319                                 drive->bad_wstat = BAD_R_STAT;
1320                                 hwif->noprobe = 0;
1321                                 goto done;
1322                         case -4: /* "cdrom" */
1323                                 drive->present = 1;
1324                                 drive->media = ide_cdrom;
1325                                 /* an ATAPI device ignores DRDY */
1326                                 drive->ready_stat = 0;
1327                                 hwif->noprobe = 0;
1328                                 goto done;
1329                         case -6: /* "autotune" */
1330                                 drive->autotune = IDE_TUNE_AUTO;
1331                                 goto obsolete_option;
1332                         case -7: /* "noautotune" */
1333                                 drive->autotune = IDE_TUNE_NOAUTO;
1334                                 goto obsolete_option;
1335                         case -9: /* "swapdata" */
1336                         case -10: /* "bswap" */
1337                                 drive->bswap = 1;
1338                                 goto done;
1339                         case -11: /* noflush */
1340                                 drive->noflush = 1;
1341                                 goto done;
1342                         case -12: /* "remap" */
1343                                 drive->remap_0_to_1 = 1;
1344                                 goto done;
1345                         case -13: /* "remap63" */
1346                                 drive->sect0 = 63;
1347                                 goto done;
1348                         case -14: /* "scsi" */
1349                                 drive->scsi = 1;
1350                                 goto done;
1351                         case 3: /* cyl,head,sect */
1352                                 drive->media    = ide_disk;
1353                                 drive->ready_stat = READY_STAT;
1354                                 drive->cyl      = drive->bios_cyl  = vals[0];
1355                                 drive->head     = drive->bios_head = vals[1];
1356                                 drive->sect     = drive->bios_sect = vals[2];
1357                                 drive->present  = 1;
1358                                 drive->forced_geom = 1;
1359                                 hwif->noprobe = 0;
1360                                 goto done;
1361                         default:
1362                                 goto bad_option;
1363                 }
1364         }
1365
1366         if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
1367                 goto bad_option;
1368         /*
1369          * Look for bus speed option:  "idebus="
1370          */
1371         if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
1372                 if (match_parm(&s[6], NULL, vals, 1) != 1)
1373                         goto bad_option;
1374                 if (vals[0] >= 20 && vals[0] <= 66) {
1375                         idebus_parameter = vals[0];
1376                 } else
1377                         printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
1378                 goto done;
1379         }
1380         /*
1381          * Look for interface options:  "idex="
1382          */
1383         if (s[3] >= '0' && s[3] <= max_hwif) {
1384                 /*
1385                  * Be VERY CAREFUL changing this: note hardcoded indexes below
1386                  * (-8, -9, -10) are reserved to ease the hardcoding.
1387                  */
1388                 static const char *ide_words[] = {
1389                         "noprobe", "serialize", "minus3", "minus4",
1390                         "reset", "dma", "ata66", "minus8", "minus9",
1391                         "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
1392                         "dtc2278", "umc8672", "ali14xx", NULL };
1393                 hw = s[3] - '0';
1394                 hwif = &ide_hwifs[hw];
1395                 i = match_parm(&s[4], ide_words, vals, 3);
1396
1397                 /*
1398                  * Cryptic check to ensure chipset not already set for hwif.
1399                  * Note: we can't depend on hwif->chipset here.
1400                  */
1401                 if ((i >= -18 && i <= -11) || (i > 0 && i <= 3)) {
1402                         /* chipset already specified */
1403                         if (is_chipset_set[hw])
1404                                 goto bad_option;
1405                         if (i > -18 && i <= -11) {
1406                                 /* these drivers are for "ide0=" only */
1407                                 if (hw != 0)
1408                                         goto bad_hwif;
1409                                 /* chipset already specified for 2nd port */
1410                                 if (is_chipset_set[hw+1])
1411                                         goto bad_option;
1412                         }
1413                         is_chipset_set[hw] = 1;
1414                         printk("\n");
1415                 }
1416
1417                 switch (i) {
1418 #ifdef CONFIG_BLK_DEV_ALI14XX
1419                         case -17: /* "ali14xx" */
1420                                 probe_ali14xx = 1;
1421                                 goto done;
1422 #endif
1423 #ifdef CONFIG_BLK_DEV_UMC8672
1424                         case -16: /* "umc8672" */
1425                                 probe_umc8672 = 1;
1426                                 goto done;
1427 #endif
1428 #ifdef CONFIG_BLK_DEV_DTC2278
1429                         case -15: /* "dtc2278" */
1430                                 probe_dtc2278 = 1;
1431                                 goto done;
1432 #endif
1433 #ifdef CONFIG_BLK_DEV_CMD640
1434                         case -14: /* "cmd640_vlb" */
1435                         {
1436                                 extern int cmd640_vlb; /* flag for cmd640.c */
1437                                 cmd640_vlb = 1;
1438                                 goto done;
1439                         }
1440 #endif
1441 #ifdef CONFIG_BLK_DEV_HT6560B
1442                         case -13: /* "ht6560b" */
1443                                 probe_ht6560b = 1;
1444                                 goto done;
1445 #endif
1446 #ifdef CONFIG_BLK_DEV_QD65XX
1447                         case -12: /* "qd65xx" */
1448                                 probe_qd65xx = 1;
1449                                 goto done;
1450 #endif
1451 #ifdef CONFIG_BLK_DEV_4DRIVES
1452                         case -11: /* "four" drives on one set of ports */
1453                         {
1454                                 ide_hwif_t *mate = &ide_hwifs[hw^1];
1455                                 mate->drives[0].select.all ^= 0x20;
1456                                 mate->drives[1].select.all ^= 0x20;
1457                                 hwif->chipset = mate->chipset = ide_4drives;
1458                                 mate->irq = hwif->irq;
1459                                 memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
1460                                 hwif->mate = mate;
1461                                 mate->mate = hwif;
1462                                 hwif->serialized = mate->serialized = 1;
1463                                 goto obsolete_option;
1464                         }
1465 #endif /* CONFIG_BLK_DEV_4DRIVES */
1466                         case -10: /* minus10 */
1467                         case -9: /* minus9 */
1468                         case -8: /* minus8 */
1469                         case -4:
1470                         case -3:
1471                                 goto bad_option;
1472                         case -7: /* ata66 */
1473 #ifdef CONFIG_BLK_DEV_IDEPCI
1474                                 /*
1475                                  * Use ATA_CBL_PATA40_SHORT so drive side
1476                                  * cable detection is also overriden.
1477                                  */
1478                                 hwif->cbl = ATA_CBL_PATA40_SHORT;
1479                                 goto obsolete_option;
1480 #else
1481                                 goto bad_hwif;
1482 #endif
1483                         case -6: /* dma */
1484                                 hwif->autodma = 1;
1485                                 goto obsolete_option;
1486                         case -5: /* "reset" */
1487                                 hwif->reset = 1;
1488                                 goto obsolete_option;
1489                         case -2: /* "serialize" */
1490                                 hwif->mate = &ide_hwifs[hw^1];
1491                                 hwif->mate->mate = hwif;
1492                                 hwif->serialized = hwif->mate->serialized = 1;
1493                                 goto obsolete_option;
1494
1495                         case -1: /* "noprobe" */
1496                                 hwif->noprobe = 1;
1497                                 goto done;
1498
1499                         case 1: /* base */
1500                                 vals[1] = vals[0] + 0x206; /* default ctl */
1501                         case 2: /* base,ctl */
1502                                 vals[2] = 0;    /* default irq = probe for it */
1503                         case 3: /* base,ctl,irq */
1504                                 hwif->hw.irq = vals[2];
1505                                 ide_init_hwif_ports(&hwif->hw, (unsigned long) vals[0], (unsigned long) vals[1], &hwif->irq);
1506                                 memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->io_ports));
1507                                 hwif->irq      = vals[2];
1508                                 hwif->noprobe  = 0;
1509                                 hwif->chipset  = ide_forced;
1510                                 goto obsolete_option;
1511
1512                         case 0: goto bad_option;
1513                         default:
1514                                 printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
1515                                 return 1;
1516                 }
1517         }
1518 bad_option:
1519         printk(" -- BAD OPTION\n");
1520         return 1;
1521 obsolete_option:
1522         printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
1523         return 1;
1524 bad_hwif:
1525         printk("-- NOT SUPPORTED ON ide%d", hw);
1526 done:
1527         printk("\n");
1528         return 1;
1529 }
1530
1531 extern void __init pnpide_init(void);
1532 extern void __exit pnpide_exit(void);
1533 extern void __init h8300_ide_init(void);
1534
1535 /*
1536  * probe_for_hwifs() finds/initializes "known" IDE interfaces
1537  */
1538 static void __init probe_for_hwifs (void)
1539 {
1540 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
1541         ide_scan_pcibus(ide_scan_direction);
1542 #endif
1543
1544 #ifdef CONFIG_ETRAX_IDE
1545         {
1546                 extern void init_e100_ide(void);
1547                 init_e100_ide();
1548         }
1549 #endif /* CONFIG_ETRAX_IDE */
1550 #ifdef CONFIG_BLK_DEV_CMD640
1551         {
1552                 extern void ide_probe_for_cmd640x(void);
1553                 ide_probe_for_cmd640x();
1554         }
1555 #endif /* CONFIG_BLK_DEV_CMD640 */
1556 #ifdef CONFIG_BLK_DEV_IDE_PMAC
1557         {
1558                 extern int pmac_ide_probe(void);
1559                 (void)pmac_ide_probe();
1560         }
1561 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
1562 #ifdef CONFIG_BLK_DEV_GAYLE
1563         {
1564                 extern void gayle_init(void);
1565                 gayle_init();
1566         }
1567 #endif /* CONFIG_BLK_DEV_GAYLE */
1568 #ifdef CONFIG_BLK_DEV_FALCON_IDE
1569         {
1570                 extern void falconide_init(void);
1571                 falconide_init();
1572         }
1573 #endif /* CONFIG_BLK_DEV_FALCON_IDE */
1574 #ifdef CONFIG_BLK_DEV_MAC_IDE
1575         {
1576                 extern void macide_init(void);
1577                 macide_init();
1578         }
1579 #endif /* CONFIG_BLK_DEV_MAC_IDE */
1580 #ifdef CONFIG_BLK_DEV_Q40IDE
1581         {
1582                 extern void q40ide_init(void);
1583                 q40ide_init();
1584         }
1585 #endif /* CONFIG_BLK_DEV_Q40IDE */
1586 #ifdef CONFIG_BLK_DEV_BUDDHA
1587         {
1588                 extern void buddha_init(void);
1589                 buddha_init();
1590         }
1591 #endif /* CONFIG_BLK_DEV_BUDDHA */
1592 #ifdef CONFIG_BLK_DEV_IDEPNP
1593         pnpide_init();
1594 #endif
1595 #ifdef CONFIG_H8300
1596         h8300_ide_init();
1597 #endif
1598 }
1599
1600 /*
1601  * Probe module
1602  */
1603
1604 EXPORT_SYMBOL(ide_lock);
1605
1606 static int ide_bus_match(struct device *dev, struct device_driver *drv)
1607 {
1608         return 1;
1609 }
1610
1611 static char *media_string(ide_drive_t *drive)
1612 {
1613         switch (drive->media) {
1614         case ide_disk:
1615                 return "disk";
1616         case ide_cdrom:
1617                 return "cdrom";
1618         case ide_tape:
1619                 return "tape";
1620         case ide_floppy:
1621                 return "floppy";
1622         case ide_optical:
1623                 return "optical";
1624         default:
1625                 return "UNKNOWN";
1626         }
1627 }
1628
1629 static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
1630 {
1631         ide_drive_t *drive = to_ide_device(dev);
1632         return sprintf(buf, "%s\n", media_string(drive));
1633 }
1634
1635 static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
1636 {
1637         ide_drive_t *drive = to_ide_device(dev);
1638         return sprintf(buf, "%s\n", drive->name);
1639 }
1640
1641 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
1642 {
1643         ide_drive_t *drive = to_ide_device(dev);
1644         return sprintf(buf, "ide:m-%s\n", media_string(drive));
1645 }
1646
1647 static struct device_attribute ide_dev_attrs[] = {
1648         __ATTR_RO(media),
1649         __ATTR_RO(drivename),
1650         __ATTR_RO(modalias),
1651         __ATTR_NULL
1652 };
1653
1654 static int ide_uevent(struct device *dev, char **envp, int num_envp,
1655                       char *buffer, int buffer_size)
1656 {
1657         ide_drive_t *drive = to_ide_device(dev);
1658         int i = 0;
1659         int length = 0;
1660
1661         add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
1662                        "MEDIA=%s", media_string(drive));
1663         add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
1664                        "DRIVENAME=%s", drive->name);
1665         add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
1666                        "MODALIAS=ide:m-%s", media_string(drive));
1667         envp[i] = NULL;
1668         return 0;
1669 }
1670
1671 static int generic_ide_probe(struct device *dev)
1672 {
1673         ide_drive_t *drive = to_ide_device(dev);
1674         ide_driver_t *drv = to_ide_driver(dev->driver);
1675
1676         return drv->probe ? drv->probe(drive) : -ENODEV;
1677 }
1678
1679 static int generic_ide_remove(struct device *dev)
1680 {
1681         ide_drive_t *drive = to_ide_device(dev);
1682         ide_driver_t *drv = to_ide_driver(dev->driver);
1683
1684         if (drv->remove)
1685                 drv->remove(drive);
1686
1687         return 0;
1688 }
1689
1690 static void generic_ide_shutdown(struct device *dev)
1691 {
1692         ide_drive_t *drive = to_ide_device(dev);
1693         ide_driver_t *drv = to_ide_driver(dev->driver);
1694
1695         if (dev->driver && drv->shutdown)
1696                 drv->shutdown(drive);
1697 }
1698
1699 struct bus_type ide_bus_type = {
1700         .name           = "ide",
1701         .match          = ide_bus_match,
1702         .uevent         = ide_uevent,
1703         .probe          = generic_ide_probe,
1704         .remove         = generic_ide_remove,
1705         .shutdown       = generic_ide_shutdown,
1706         .dev_attrs      = ide_dev_attrs,
1707         .suspend        = generic_ide_suspend,
1708         .resume         = generic_ide_resume,
1709 };
1710
1711 EXPORT_SYMBOL_GPL(ide_bus_type);
1712
1713 /*
1714  * This is gets invoked once during initialization, to set *everything* up
1715  */
1716 static int __init ide_init(void)
1717 {
1718         int ret;
1719
1720         printk(KERN_INFO "Uniform Multi-Platform E-IDE driver " REVISION "\n");
1721         system_bus_speed = ide_system_bus_speed();
1722
1723         ret = bus_register(&ide_bus_type);
1724         if (ret < 0) {
1725                 printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
1726                 return ret;
1727         }
1728
1729         init_ide_data();
1730
1731         proc_ide_create();
1732
1733 #ifdef CONFIG_BLK_DEV_ALI14XX
1734         if (probe_ali14xx)
1735                 (void)ali14xx_init();
1736 #endif
1737 #ifdef CONFIG_BLK_DEV_UMC8672
1738         if (probe_umc8672)
1739                 (void)umc8672_init();
1740 #endif
1741 #ifdef CONFIG_BLK_DEV_DTC2278
1742         if (probe_dtc2278)
1743                 (void)dtc2278_init();
1744 #endif
1745 #ifdef CONFIG_BLK_DEV_HT6560B
1746         if (probe_ht6560b)
1747                 (void)ht6560b_init();
1748 #endif
1749 #ifdef CONFIG_BLK_DEV_QD65XX
1750         if (probe_qd65xx)
1751                 (void)qd65xx_init();
1752 #endif
1753
1754         /* Probe for special PCI and other "known" interface chipsets. */
1755         probe_for_hwifs();
1756
1757         return 0;
1758 }
1759
1760 #ifdef MODULE
1761 static char *options = NULL;
1762 module_param(options, charp, 0);
1763 MODULE_LICENSE("GPL");
1764
1765 static void __init parse_options (char *line)
1766 {
1767         char *next = line;
1768
1769         if (line == NULL || !*line)
1770                 return;
1771         while ((line = next) != NULL) {
1772                 if ((next = strchr(line,' ')) != NULL)
1773                         *next++ = 0;
1774                 if (!ide_setup(line))
1775                         printk (KERN_INFO "Unknown option '%s'\n", line);
1776         }
1777 }
1778
1779 int __init init_module (void)
1780 {
1781         parse_options(options);
1782         return ide_init();
1783 }
1784
1785 void __exit cleanup_module (void)
1786 {
1787         int index;
1788
1789         for (index = 0; index < MAX_HWIFS; ++index)
1790                 ide_unregister(index);
1791
1792 #ifdef CONFIG_BLK_DEV_IDEPNP
1793         pnpide_exit();
1794 #endif
1795
1796         proc_ide_destroy();
1797
1798         bus_unregister(&ide_bus_type);
1799 }
1800
1801 #else /* !MODULE */
1802
1803 __setup("", ide_setup);
1804
1805 module_init(ide_init);
1806
1807 #endif /* MODULE */