drivers/acpi/bus.c

   1 /*
   2  *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   5  *
   6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or (at
  11  *  your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful, but
  14  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *  General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License along
  19  *  with this program; if not, write to the Free Software Foundation, Inc.,
  20  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  21  *
  22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/ioport.h>
  28 #include <linux/kernel.h>
  29 #include <linux/list.h>
  30 #include <linux/sched.h>
  31 #include <linux/pm.h>
  32 #include <linux/device.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/acpi.h>
  35 #include <linux/slab.h>
  36 #include <linux/regulator/machine.h>
  37 #ifdef CONFIG_X86
  38 #include <asm/mpspec.h>
  39 #endif
  40 #include <linux/pci.h>
  41 #include <acpi/acpi_bus.h>
  42 #include <acpi/acpi_drivers.h>
  43 #include <acpi/apei.h>
  44 #include <linux/dmi.h>
  45 #include <linux/suspend.h>
  46
  47 #include "internal.h"
  48
  49 #define _COMPONENT              ACPI_BUS_COMPONENT
  50 ACPI_MODULE_NAME("bus");
  51
  52 struct acpi_device *acpi_root;
  53 struct proc_dir_entry *acpi_root_dir;
  54 EXPORT_SYMBOL(acpi_root_dir);
  55
  56 #define STRUCT_TO_INT(s)        (*((int*)&s))
  57
  58
  59 #ifdef CONFIG_X86
  60 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  61 static inline int set_copy_dsdt(const struct dmi_system_id *id)
  62 {
  63         return 0;
  64 }
  65 #else
  66 static int set_copy_dsdt(const struct dmi_system_id *id)
  67 {
  68         printk(KERN_NOTICE "%s detected - "
  69                 "force copy of DSDT to local memory\n", id->ident);
  70         acpi_gbl_copy_dsdt_locally = 1;
  71         return 0;
  72 }
  73 #endif
  74
  75 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  76         /*
  77          * Invoke DSDT corruption work-around on all Toshiba Satellite.
  78          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  79          */
  80         {
  81          .callback = set_copy_dsdt,
  82          .ident = "TOSHIBA Satellite",
  83          .matches = {
  84                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  85                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  86                 },
  87         },
  88         {}
  89 };
  90 #else
  91 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  92         {}
  93 };
  94 #endif
  95
  96 /* --------------------------------------------------------------------------
  97                                 Device Management
  98    -------------------------------------------------------------------------- */
  99
 100 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
 101 {
 102         acpi_status status = AE_OK;
 103
 104
 105         if (!device)
 106                 return -EINVAL;
 107
 108         /* TBD: Support fixed-feature devices */
 109
 110         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
 111         if (ACPI_FAILURE(status) || !*device) {
 112                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 113                                   handle));
 114                 return -ENODEV;
 115         }
 116
 117         return 0;
 118 }
 119
 120 EXPORT_SYMBOL(acpi_bus_get_device);
 121
 122 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
 123                                        unsigned long long *sta)
 124 {
 125         acpi_status status;
 126
 127         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
 128         if (ACPI_SUCCESS(status))
 129                 return AE_OK;
 130
 131         if (status == AE_NOT_FOUND) {
 132                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 133                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 134                 return AE_OK;
 135         }
 136         return status;
 137 }
 138
 139 int acpi_bus_get_status(struct acpi_device *device)
 140 {
 141         acpi_status status;
 142         unsigned long long sta;
 143
 144         status = acpi_bus_get_status_handle(device->handle, &sta);
 145         if (ACPI_FAILURE(status))
 146                 return -ENODEV;
 147
 148         STRUCT_TO_INT(device->status) = (int) sta;
 149
 150         if (device->status.functional && !device->status.present) {
 151                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 152                        "functional but not present;\n",
 153                         device->pnp.bus_id,
 154                         (u32) STRUCT_TO_INT(device->status)));
 155         }
 156
 157         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 158                           device->pnp.bus_id,
 159                           (u32) STRUCT_TO_INT(device->status)));
 160         return 0;
 161 }
 162 EXPORT_SYMBOL(acpi_bus_get_status);
 163
 164 void acpi_bus_private_data_handler(acpi_handle handle,
 165                                    void *context)
 166 {
 167         return;
 168 }
 169 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 170
 171 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 172 {
 173         acpi_status status = AE_OK;
 174
 175         if (!*data)
 176                 return -EINVAL;
 177
 178         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 179         if (ACPI_FAILURE(status) || !*data) {
 180                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 181                                 handle));
 182                 return -ENODEV;
 183         }
 184
 185         return 0;
 186 }
 187 EXPORT_SYMBOL(acpi_bus_get_private_data);
 188
 189 static void acpi_print_osc_error(acpi_handle handle,
 190         struct acpi_osc_context *context, char *error)
 191 {
 192         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 193         int i;
 194
 195         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 196                 printk(KERN_DEBUG "%s\n", error);
 197         else {
 198                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 199                 kfree(buffer.pointer);
 200         }
 201         printk(KERN_DEBUG"_OSC request data:");
 202         for (i = 0; i < context->cap.length; i += sizeof(u32))
 203                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 204         printk("\n");
 205 }
 206
 207 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 208 {
 209         int i;
 210         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 211                 24, 26, 28, 30, 32, 34};
 212
 213         if (strlen(str) != 36)
 214                 return AE_BAD_PARAMETER;
 215         for (i = 0; i < 36; i++) {
 216                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 217                         if (str[i] != '-')
 218                                 return AE_BAD_PARAMETER;
 219                 } else if (!isxdigit(str[i]))
 220                         return AE_BAD_PARAMETER;
 221         }
 222         for (i = 0; i < 16; i++) {
 223                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 224                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 225         }
 226         return AE_OK;
 227 }
 228
 229 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 230 {
 231         acpi_status status;
 232         struct acpi_object_list input;
 233         union acpi_object in_params[4];
 234         union acpi_object *out_obj;
 235         u8 uuid[16];
 236         u32 errors;
 237         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 238
 239         if (!context)
 240                 return AE_ERROR;
 241         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 242                 return AE_ERROR;
 243         context->ret.length = ACPI_ALLOCATE_BUFFER;
 244         context->ret.pointer = NULL;
 245
 246         /* Setting up input parameters */
 247         input.count = 4;
 248         input.pointer = in_params;
 249         in_params[0].type               = ACPI_TYPE_BUFFER;
 250         in_params[0].buffer.length      = 16;
 251         in_params[0].buffer.pointer     = uuid;
 252         in_params[1].type               = ACPI_TYPE_INTEGER;
 253         in_params[1].integer.value      = context->rev;
 254         in_params[2].type               = ACPI_TYPE_INTEGER;
 255         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 256         in_params[3].type               = ACPI_TYPE_BUFFER;
 257         in_params[3].buffer.length      = context->cap.length;
 258         in_params[3].buffer.pointer     = context->cap.pointer;
 259
 260         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 261         if (ACPI_FAILURE(status))
 262                 return status;
 263
 264         if (!output.length)
 265                 return AE_NULL_OBJECT;
 266
 267         out_obj = output.pointer;
 268         if (out_obj->type != ACPI_TYPE_BUFFER
 269                 || out_obj->buffer.length != context->cap.length) {
 270                 acpi_print_osc_error(handle, context,
 271                         "_OSC evaluation returned wrong type");
 272                 status = AE_TYPE;
 273                 goto out_kfree;
 274         }
 275         /* Need to ignore the bit0 in result code */
 276         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 277         if (errors) {
 278                 if (errors & OSC_REQUEST_ERROR)
 279                         acpi_print_osc_error(handle, context,
 280                                 "_OSC request failed");
 281                 if (errors & OSC_INVALID_UUID_ERROR)
 282                         acpi_print_osc_error(handle, context,
 283                                 "_OSC invalid UUID");
 284                 if (errors & OSC_INVALID_REVISION_ERROR)
 285                         acpi_print_osc_error(handle, context,
 286                                 "_OSC invalid revision");
 287                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 288                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 289                             & OSC_QUERY_ENABLE)
 290                                 goto out_success;
 291                         status = AE_SUPPORT;
 292                         goto out_kfree;
 293                 }
 294                 status = AE_ERROR;
 295                 goto out_kfree;
 296         }
 297 out_success:
 298         context->ret.length = out_obj->buffer.length;
 299         context->ret.pointer = kmemdup(out_obj->buffer.pointer,
 300                                        context->ret.length, GFP_KERNEL);
 301         if (!context->ret.pointer) {
 302                 status =  AE_NO_MEMORY;
 303                 goto out_kfree;
 304         }
 305         status =  AE_OK;
 306
 307 out_kfree:
 308         kfree(output.pointer);
 309         if (status != AE_OK)
 310                 context->ret.pointer = NULL;
 311         return status;
 312 }
 313 EXPORT_SYMBOL(acpi_run_osc);
 314
 315 bool osc_sb_apei_support_acked;
 316 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 317 static void acpi_bus_osc_support(void)
 318 {
 319         u32 capbuf[2];
 320         struct acpi_osc_context context = {
 321                 .uuid_str = sb_uuid_str,
 322                 .rev = 1,
 323                 .cap.length = 8,
 324                 .cap.pointer = capbuf,
 325         };
 326         acpi_handle handle;
 327
 328         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 329         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 330 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 331                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 332         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 333 #endif
 334
 335 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 336         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 337 #endif
 338
 339 #ifdef ACPI_HOTPLUG_OST
 340         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 341 #endif
 342
 343         if (!ghes_disable)
 344                 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
 345         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 346                 return;
 347         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 348                 u32 *capbuf_ret = context.ret.pointer;
 349                 if (context.ret.length > OSC_SUPPORT_TYPE)
 350                         osc_sb_apei_support_acked =
 351                                 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
 352                 kfree(context.ret.pointer);
 353         }
 354         /* do we need to check other returned cap? Sounds no */
 355 }
 356
 357 /* --------------------------------------------------------------------------
 358                                 Event Management
 359    -------------------------------------------------------------------------- */
 360
 361 #ifdef CONFIG_ACPI_PROC_EVENT
 362 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 363
 364 LIST_HEAD(acpi_bus_event_list);
 365 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 366
 367 extern int event_is_open;
 368
 369 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 370 {
 371         struct acpi_bus_event *event;
 372         unsigned long flags = 0;
 373
 374         /* drop event on the floor if no one's listening */
 375         if (!event_is_open)
 376                 return 0;
 377
 378         event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 379         if (!event)
 380                 return -ENOMEM;
 381
 382         strcpy(event->device_class, device_class);
 383         strcpy(event->bus_id, bus_id);
 384         event->type = type;
 385         event->data = data;
 386
 387         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 388         list_add_tail(&event->node, &acpi_bus_event_list);
 389         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 390
 391         wake_up_interruptible(&acpi_bus_event_queue);
 392
 393         return 0;
 394
 395 }
 396
 397 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 398
 399 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 400 {
 401         if (!device)
 402                 return -EINVAL;
 403         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 404                                              device->pnp.bus_id, type, data);
 405 }
 406
 407 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 408
 409 int acpi_bus_receive_event(struct acpi_bus_event *event)
 410 {
 411         unsigned long flags = 0;
 412         struct acpi_bus_event *entry = NULL;
 413
 414         DECLARE_WAITQUEUE(wait, current);
 415
 416
 417         if (!event)
 418                 return -EINVAL;
 419
 420         if (list_empty(&acpi_bus_event_list)) {
 421
 422                 set_current_state(TASK_INTERRUPTIBLE);
 423                 add_wait_queue(&acpi_bus_event_queue, &wait);
 424
 425                 if (list_empty(&acpi_bus_event_list))
 426                         schedule();
 427
 428                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 429                 set_current_state(TASK_RUNNING);
 430
 431                 if (signal_pending(current))
 432                         return -ERESTARTSYS;
 433         }
 434
 435         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 436         if (!list_empty(&acpi_bus_event_list)) {
 437                 entry = list_entry(acpi_bus_event_list.next,
 438                                    struct acpi_bus_event, node);
 439                 list_del(&entry->node);
 440         }
 441         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 442
 443         if (!entry)
 444                 return -ENODEV;
 445
 446         memcpy(event, entry, sizeof(struct acpi_bus_event));
 447
 448         kfree(entry);
 449
 450         return 0;
 451 }
 452
 453 #endif  /* CONFIG_ACPI_PROC_EVENT */
 454
 455 /* --------------------------------------------------------------------------
 456                              Notification Handling
 457    -------------------------------------------------------------------------- */
 458
 459 static void acpi_bus_check_device(acpi_handle handle)
 460 {
 461         struct acpi_device *device;
 462         acpi_status status;
 463         struct acpi_device_status old_status;
 464
 465         if (acpi_bus_get_device(handle, &device))
 466                 return;
 467         if (!device)
 468                 return;
 469
 470         old_status = device->status;
 471
 472         /*
 473          * Make sure this device's parent is present before we go about
 474          * messing with the device.
 475          */
 476         if (device->parent && !device->parent->status.present) {
 477                 device->status = device->parent->status;
 478                 return;
 479         }
 480
 481         status = acpi_bus_get_status(device);
 482         if (ACPI_FAILURE(status))
 483                 return;
 484
 485         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 486                 return;
 487
 488         /*
 489          * Device Insertion/Removal
 490          */
 491         if ((device->status.present) && !(old_status.present)) {
 492                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 493                 /* TBD: Handle device insertion */
 494         } else if (!(device->status.present) && (old_status.present)) {
 495                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 496                 /* TBD: Handle device removal */
 497         }
 498 }
 499
 500 static void acpi_bus_check_scope(acpi_handle handle)
 501 {
 502         /* Status Change? */
 503         acpi_bus_check_device(handle);
 504
 505         /*
 506          * TBD: Enumerate child devices within this device's scope and
 507          *       run acpi_bus_check_device()'s on them.
 508          */
 509 }
 510
 511 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 512 int register_acpi_bus_notifier(struct notifier_block *nb)
 513 {
 514         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 515 }
 516 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 517
 518 void unregister_acpi_bus_notifier(struct notifier_block *nb)
 519 {
 520         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 521 }
 522 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 523
 524 /**
 525  * acpi_bus_notify
 526  * ---------------
 527  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 528  */
 529 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 530 {
 531         struct acpi_device *device = NULL;
 532         struct acpi_driver *driver;
 533
 534         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 535                           type, handle));
 536
 537         blocking_notifier_call_chain(&acpi_bus_notify_list,
 538                 type, (void *)handle);
 539
 540         switch (type) {
 541
 542         case ACPI_NOTIFY_BUS_CHECK:
 543                 acpi_bus_check_scope(handle);
 544                 /*
 545                  * TBD: We'll need to outsource certain events to non-ACPI
 546                  *      drivers via the device manager (device.c).
 547                  */
 548                 break;
 549
 550         case ACPI_NOTIFY_DEVICE_CHECK:
 551                 acpi_bus_check_device(handle);
 552                 /*
 553                  * TBD: We'll need to outsource certain events to non-ACPI
 554                  *      drivers via the device manager (device.c).
 555                  */
 556                 break;
 557
 558         case ACPI_NOTIFY_DEVICE_WAKE:
 559                 /* TBD */
 560                 break;
 561
 562         case ACPI_NOTIFY_EJECT_REQUEST:
 563                 /* TBD */
 564                 break;
 565
 566         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 567                 /* TBD: Exactly what does 'light' mean? */
 568                 break;
 569
 570         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 571                 /* TBD */
 572                 break;
 573
 574         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 575                 /* TBD */
 576                 break;
 577
 578         case ACPI_NOTIFY_POWER_FAULT:
 579                 /* TBD */
 580                 break;
 581
 582         default:
 583                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 584                                   "Received unknown/unsupported notification [%08x]\n",
 585                                   type));
 586                 break;
 587         }
 588
 589         acpi_bus_get_device(handle, &device);
 590         if (device) {
 591                 driver = device->driver;
 592                 if (driver && driver->ops.notify &&
 593                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 594                         driver->ops.notify(device, type);
 595         }
 596 }
 597
 598 /* --------------------------------------------------------------------------
 599                              Initialization/Cleanup
 600    -------------------------------------------------------------------------- */
 601
 602 static int __init acpi_bus_init_irq(void)
 603 {
 604         acpi_status status = AE_OK;
 605         union acpi_object arg = { ACPI_TYPE_INTEGER };
 606         struct acpi_object_list arg_list = { 1, &arg };
 607         char *message = NULL;
 608
 609
 610         /*
 611          * Let the system know what interrupt model we are using by
 612          * evaluating the \_PIC object, if exists.
 613          */
 614
 615         switch (acpi_irq_model) {
 616         case ACPI_IRQ_MODEL_PIC:
 617                 message = "PIC";
 618                 break;
 619         case ACPI_IRQ_MODEL_IOAPIC:
 620                 message = "IOAPIC";
 621                 break;
 622         case ACPI_IRQ_MODEL_IOSAPIC:
 623                 message = "IOSAPIC";
 624                 break;
 625         case ACPI_IRQ_MODEL_PLATFORM:
 626                 message = "platform specific model";
 627                 break;
 628         default:
 629                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 630                 return -ENODEV;
 631         }
 632
 633         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 634
 635         arg.integer.value = acpi_irq_model;
 636
 637         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 638         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 639                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 640                 return -ENODEV;
 641         }
 642
 643         return 0;
 644 }
 645
 646 u8 acpi_gbl_permanent_mmap;
 647
 648
 649 void __init acpi_early_init(void)
 650 {
 651         acpi_status status = AE_OK;
 652
 653         if (acpi_disabled)
 654                 return;
 655
 656         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 657
 658         /* enable workarounds, unless strict ACPI spec. compliance */
 659         if (!acpi_strict)
 660                 acpi_gbl_enable_interpreter_slack = TRUE;
 661
 662         acpi_gbl_permanent_mmap = 1;
 663
 664         /*
 665          * If the machine falls into the DMI check table,
 666          * DSDT will be copied to memory
 667          */
 668         dmi_check_system(dsdt_dmi_table);
 669
 670         status = acpi_reallocate_root_table();
 671         if (ACPI_FAILURE(status)) {
 672                 printk(KERN_ERR PREFIX
 673                        "Unable to reallocate ACPI tables\n");
 674                 goto error0;
 675         }
 676
 677         status = acpi_initialize_subsystem();
 678         if (ACPI_FAILURE(status)) {
 679                 printk(KERN_ERR PREFIX
 680                        "Unable to initialize the ACPI Interpreter\n");
 681                 goto error0;
 682         }
 683
 684         status = acpi_load_tables();
 685         if (ACPI_FAILURE(status)) {
 686                 printk(KERN_ERR PREFIX
 687                        "Unable to load the System Description Tables\n");
 688                 goto error0;
 689         }
 690
 691 #ifdef CONFIG_X86
 692         if (!acpi_ioapic) {
 693                 /* compatible (0) means level (3) */
 694                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 695                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 696                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 697                 }
 698                 /* Set PIC-mode SCI trigger type */
 699                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 700                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 701         } else {
 702                 /*
 703                  * now that acpi_gbl_FADT is initialized,
 704                  * update it with result from INT_SRC_OVR parsing
 705                  */
 706                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 707         }
 708 #endif
 709
 710         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
 711         if (ACPI_FAILURE(status)) {
 712                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 713                 goto error0;
 714         }
 715
 716         /*
 717          * If the system is using ACPI then we can be reasonably
 718          * confident that any regulators are managed by the firmware
 719          * so tell the regulator core it has everything it needs to
 720          * know.
 721          */
 722         regulator_has_full_constraints();
 723
 724         return;
 725
 726       error0:
 727         disable_acpi();
 728         return;
 729 }
 730
 731 static int __init acpi_bus_init(void)
 732 {
 733         int result = 0;
 734         acpi_status status = AE_OK;
 735         extern acpi_status acpi_os_initialize1(void);
 736
 737         acpi_os_initialize1();
 738
 739         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
 740         if (ACPI_FAILURE(status)) {
 741                 printk(KERN_ERR PREFIX
 742                        "Unable to start the ACPI Interpreter\n");
 743                 goto error1;
 744         }
 745
 746         /*
 747          * ACPI 2.0 requires the EC driver to be loaded and work before
 748          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 749          * is called).
 750          *
 751          * This is accomplished by looking for the ECDT table, and getting
 752          * the EC parameters out of that.
 753          */
 754         status = acpi_ec_ecdt_probe();
 755         /* Ignore result. Not having an ECDT is not fatal. */
 756
 757         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 758         if (ACPI_FAILURE(status)) {
 759                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 760                 goto error1;
 761         }
 762
 763         /*
 764          * _OSC method may exist in module level code,
 765          * so it must be run after ACPI_FULL_INITIALIZATION
 766          */
 767         acpi_bus_osc_support();
 768
 769         /*
 770          * _PDC control method may load dynamic SSDT tables,
 771          * and we need to install the table handler before that.
 772          */
 773         acpi_sysfs_init();
 774
 775         acpi_early_processor_set_pdc();
 776
 777         /*
 778          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 779          * is necessary to enable it as early as possible.
 780          */
 781         acpi_boot_ec_enable();
 782
 783         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 784
 785         /* Initialize sleep structures */
 786         acpi_sleep_init();
 787
 788         /*
 789          * Get the system interrupt model and evaluate \_PIC.
 790          */
 791         result = acpi_bus_init_irq();
 792         if (result)
 793                 goto error1;
 794
 795         /*
 796          * Register the for all standard device notifications.
 797          */
 798         status =
 799             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 800                                         &acpi_bus_notify, NULL);
 801         if (ACPI_FAILURE(status)) {
 802                 printk(KERN_ERR PREFIX
 803                        "Unable to register for device notifications\n");
 804                 goto error1;
 805         }
 806
 807         /*
 808          * Create the top ACPI proc directory
 809          */
 810         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 811
 812         return 0;
 813
 814         /* Mimic structured exception handling */
 815       error1:
 816         acpi_terminate();
 817         return -ENODEV;
 818 }
 819
 820 struct kobject *acpi_kobj;
 821 EXPORT_SYMBOL_GPL(acpi_kobj);
 822
 823 static int __init acpi_init(void)
 824 {
 825         int result;
 826
 827         if (acpi_disabled) {
 828                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 829                 return -ENODEV;
 830         }
 831
 832         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 833         if (!acpi_kobj) {
 834                 printk(KERN_WARNING "%s: kset create error\n", __func__);
 835                 acpi_kobj = NULL;
 836         }
 837
 838         init_acpi_device_notify();
 839         result = acpi_bus_init();
 840         if (result) {
 841                 disable_acpi();
 842                 return result;
 843         }
 844
 845         pci_mmcfg_late_init();
 846         acpi_scan_init();
 847         acpi_ec_init();
 848         acpi_debugfs_init();
 849         acpi_sleep_proc_init();
 850         acpi_wakeup_device_init();
 851         return 0;
 852 }
 853
 854 subsys_initcall(acpi_init);