git.oblomov.eu Git - linux-2.6/blob - drivers/acpi/utilities/utxface.c

   1 /******************************************************************************
   2  *
   3  * Module Name: utxface - External interfaces for "global" ACPI functions
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2005, R. Byron Moore
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <linux/module.h>
  45
  46 #include <acpi/acpi.h>
  47 #include <acpi/acevents.h>
  48 #include <acpi/acnamesp.h>
  49 #include <acpi/acdebug.h>
  50
  51 #define _COMPONENT          ACPI_UTILITIES
  52 ACPI_MODULE_NAME("utxface")
  53
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    acpi_initialize_subsystem
  57  *
  58  * PARAMETERS:  None
  59  *
  60  * RETURN:      Status
  61  *
  62  * DESCRIPTION: Initializes all global variables.  This is the first function
  63  *              called, so any early initialization belongs here.
  64  *
  65  ******************************************************************************/
  66 acpi_status acpi_initialize_subsystem(void)
  67 {
  68         acpi_status status;
  69
  70         ACPI_FUNCTION_TRACE("acpi_initialize_subsystem");
  71
  72         ACPI_DEBUG_EXEC(acpi_ut_init_stack_ptr_trace());
  73
  74         /* Initialize the OS-Dependent layer */
  75
  76         status = acpi_os_initialize();
  77         if (ACPI_FAILURE(status)) {
  78                 ACPI_REPORT_ERROR(("OSD failed to initialize, %s\n",
  79                                    acpi_format_exception(status)));
  80                 return_ACPI_STATUS(status);
  81         }
  82
  83         /* Initialize all globals used by the subsystem */
  84
  85         acpi_ut_init_globals();
  86
  87         /* Create the default mutex objects */
  88
  89         status = acpi_ut_mutex_initialize();
  90         if (ACPI_FAILURE(status)) {
  91                 ACPI_REPORT_ERROR(("Global mutex creation failure, %s\n",
  92                                    acpi_format_exception(status)));
  93                 return_ACPI_STATUS(status);
  94         }
  95
  96         /*
  97          * Initialize the namespace manager and
  98          * the root of the namespace tree
  99          */
 100         status = acpi_ns_root_initialize();
 101         if (ACPI_FAILURE(status)) {
 102                 ACPI_REPORT_ERROR(("Namespace initialization failure, %s\n",
 103                                    acpi_format_exception(status)));
 104                 return_ACPI_STATUS(status);
 105         }
 106
 107         /* If configured, initialize the AML debugger */
 108
 109         ACPI_DEBUGGER_EXEC(status = acpi_db_initialize());
 110
 111         return_ACPI_STATUS(status);
 112 }
 113
 114 /*******************************************************************************
 115  *
 116  * FUNCTION:    acpi_enable_subsystem
 117  *
 118  * PARAMETERS:  Flags           - Init/enable Options
 119  *
 120  * RETURN:      Status
 121  *
 122  * DESCRIPTION: Completes the subsystem initialization including hardware.
 123  *              Puts system into ACPI mode if it isn't already.
 124  *
 125  ******************************************************************************/
 126
 127 acpi_status acpi_enable_subsystem(u32 flags)
 128 {
 129         acpi_status status = AE_OK;
 130
 131         ACPI_FUNCTION_TRACE("acpi_enable_subsystem");
 132
 133         /*
 134          * We must initialize the hardware before we can enable ACPI.
 135          * The values from the FADT are validated here.
 136          */
 137         if (!(flags & ACPI_NO_HARDWARE_INIT)) {
 138                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 139                                   "[Init] Initializing ACPI hardware\n"));
 140
 141                 status = acpi_hw_initialize();
 142                 if (ACPI_FAILURE(status)) {
 143                         return_ACPI_STATUS(status);
 144                 }
 145         }
 146
 147         /* Enable ACPI mode */
 148
 149         if (!(flags & ACPI_NO_ACPI_ENABLE)) {
 150                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 151                                   "[Init] Going into ACPI mode\n"));
 152
 153                 acpi_gbl_original_mode = acpi_hw_get_mode();
 154
 155                 status = acpi_enable();
 156                 if (ACPI_FAILURE(status)) {
 157                         ACPI_DEBUG_PRINT((ACPI_DB_WARN,
 158                                           "acpi_enable failed.\n"));
 159                         return_ACPI_STATUS(status);
 160                 }
 161         }
 162
 163         /*
 164          * Install the default op_region handlers. These are installed unless
 165          * other handlers have already been installed via the
 166          * install_address_space_handler interface.
 167          */
 168         if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
 169                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 170                                   "[Init] Installing default address space handlers\n"));
 171
 172                 status = acpi_ev_install_region_handlers();
 173                 if (ACPI_FAILURE(status)) {
 174                         return_ACPI_STATUS(status);
 175                 }
 176         }
 177
 178         /*
 179          * Initialize ACPI Event handling (Fixed and General Purpose)
 180          *
 181          * Note1: We must have the hardware and events initialized before we can
 182          * execute any control methods safely. Any control method can require
 183          * ACPI hardware support, so the hardware must be fully initialized before
 184          * any method execution!
 185          *
 186          * Note2: Fixed events are initialized and enabled here. GPEs are
 187          * initialized, but cannot be enabled until after the hardware is
 188          * completely initialized (SCI and global_lock activated)
 189          */
 190         if (!(flags & ACPI_NO_EVENT_INIT)) {
 191                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 192                                   "[Init] Initializing ACPI events\n"));
 193
 194                 status = acpi_ev_initialize_events();
 195                 if (ACPI_FAILURE(status)) {
 196                         return_ACPI_STATUS(status);
 197                 }
 198         }
 199
 200         /*
 201          * Install the SCI handler and Global Lock handler. This completes the
 202          * hardware initialization.
 203          */
 204         if (!(flags & ACPI_NO_HANDLER_INIT)) {
 205                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 206                                   "[Init] Installing SCI/GL handlers\n"));
 207
 208                 status = acpi_ev_install_xrupt_handlers();
 209                 if (ACPI_FAILURE(status)) {
 210                         return_ACPI_STATUS(status);
 211                 }
 212         }
 213
 214         /*
 215          * Complete the GPE initialization for the GPE blocks defined in the FADT
 216          * (GPE block 0 and 1).
 217          *
 218          * Note1: This is where the _PRW methods are executed for the GPEs. These
 219          * methods can only be executed after the SCI and Global Lock handlers are
 220          * installed and initialized.
 221          *
 222          * Note2: Currently, there seems to be no need to run the _REG methods
 223          * before execution of the _PRW methods and enabling of the GPEs.
 224          */
 225         if (!(flags & ACPI_NO_EVENT_INIT)) {
 226                 status = acpi_ev_install_fadt_gpes();
 227                 if (ACPI_FAILURE(status)) {
 228                         return (status);
 229                 }
 230         }
 231
 232         return_ACPI_STATUS(status);
 233 }
 234
 235 /*******************************************************************************
 236  *
 237  * FUNCTION:    acpi_initialize_objects
 238  *
 239  * PARAMETERS:  Flags           - Init/enable Options
 240  *
 241  * RETURN:      Status
 242  *
 243  * DESCRIPTION: Completes namespace initialization by initializing device
 244  *              objects and executing AML code for Regions, buffers, etc.
 245  *
 246  ******************************************************************************/
 247
 248 acpi_status acpi_initialize_objects(u32 flags)
 249 {
 250         acpi_status status = AE_OK;
 251
 252         ACPI_FUNCTION_TRACE("acpi_initialize_objects");
 253
 254         /*
 255          * Run all _REG methods
 256          *
 257          * Note: Any objects accessed by the _REG methods will be automatically
 258          * initialized, even if they contain executable AML (see the call to
 259          * acpi_ns_initialize_objects below).
 260          */
 261         if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
 262                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 263                                   "[Init] Executing _REG op_region methods\n"));
 264
 265                 status = acpi_ev_initialize_op_regions();
 266                 if (ACPI_FAILURE(status)) {
 267                         return_ACPI_STATUS(status);
 268                 }
 269         }
 270
 271         /*
 272          * Initialize the objects that remain uninitialized. This runs the
 273          * executable AML that may be part of the declaration of these objects:
 274          * operation_regions, buffer_fields, Buffers, and Packages.
 275          */
 276         if (!(flags & ACPI_NO_OBJECT_INIT)) {
 277                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 278                                   "[Init] Completing Initialization of ACPI Objects\n"));
 279
 280                 status = acpi_ns_initialize_objects();
 281                 if (ACPI_FAILURE(status)) {
 282                         return_ACPI_STATUS(status);
 283                 }
 284         }
 285
 286         /*
 287          * Initialize all device objects in the namespace. This runs the device
 288          * _STA and _INI methods.
 289          */
 290         if (!(flags & ACPI_NO_DEVICE_INIT)) {
 291                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 292                                   "[Init] Initializing ACPI Devices\n"));
 293
 294                 status = acpi_ns_initialize_devices();
 295                 if (ACPI_FAILURE(status)) {
 296                         return_ACPI_STATUS(status);
 297                 }
 298         }
 299
 300         /*
 301          * Empty the caches (delete the cached objects) on the assumption that
 302          * the table load filled them up more than they will be at runtime --
 303          * thus wasting non-paged memory.
 304          */
 305         status = acpi_purge_cached_objects();
 306
 307         acpi_gbl_startup_flags |= ACPI_INITIALIZED_OK;
 308         return_ACPI_STATUS(status);
 309 }
 310
 311 /*******************************************************************************
 312  *
 313  * FUNCTION:    acpi_terminate
 314  *
 315  * PARAMETERS:  None
 316  *
 317  * RETURN:      Status
 318  *
 319  * DESCRIPTION: Shutdown the ACPI subsystem.  Release all resources.
 320  *
 321  ******************************************************************************/
 322
 323 acpi_status acpi_terminate(void)
 324 {
 325         acpi_status status;
 326
 327         ACPI_FUNCTION_TRACE("acpi_terminate");
 328
 329         /* Terminate the AML Debugger if present */
 330
 331         ACPI_DEBUGGER_EXEC(acpi_gbl_db_terminate_threads = TRUE);
 332
 333         /* Shutdown and free all resources */
 334
 335         acpi_ut_subsystem_shutdown();
 336
 337         /* Free the mutex objects */
 338
 339         acpi_ut_mutex_terminate();
 340
 341 #ifdef ACPI_DEBUGGER
 342
 343         /* Shut down the debugger */
 344
 345         acpi_db_terminate();
 346 #endif
 347
 348         /* Now we can shutdown the OS-dependent layer */
 349
 350         status = acpi_os_terminate();
 351         return_ACPI_STATUS(status);
 352 }
 353
 354 #ifdef ACPI_FUTURE_USAGE
 355 /*******************************************************************************
 356  *
 357  * FUNCTION:    acpi_subsystem_status
 358  *
 359  * PARAMETERS:  None
 360  *
 361  * RETURN:      Status of the ACPI subsystem
 362  *
 363  * DESCRIPTION: Other drivers that use the ACPI subsystem should call this
 364  *              before making any other calls, to ensure the subsystem
 365  *              initialized successfully.
 366  *
 367  ******************************************************************************/
 368
 369 acpi_status acpi_subsystem_status(void)
 370 {
 371
 372         if (acpi_gbl_startup_flags & ACPI_INITIALIZED_OK) {
 373                 return (AE_OK);
 374         } else {
 375                 return (AE_ERROR);
 376         }
 377 }
 378
 379 /*******************************************************************************
 380  *
 381  * FUNCTION:    acpi_get_system_info
 382  *
 383  * PARAMETERS:  out_buffer      - A buffer to receive the resources for the
 384  *                                device
 385  *
 386  * RETURN:      Status          - the status of the call
 387  *
 388  * DESCRIPTION: This function is called to get information about the current
 389  *              state of the ACPI subsystem.  It will return system information
 390  *              in the out_buffer.
 391  *
 392  *              If the function fails an appropriate status will be returned
 393  *              and the value of out_buffer is undefined.
 394  *
 395  ******************************************************************************/
 396
 397 acpi_status acpi_get_system_info(struct acpi_buffer * out_buffer)
 398 {
 399         struct acpi_system_info *info_ptr;
 400         acpi_status status;
 401         u32 i;
 402
 403         ACPI_FUNCTION_TRACE("acpi_get_system_info");
 404
 405         /* Parameter validation */
 406
 407         status = acpi_ut_validate_buffer(out_buffer);
 408         if (ACPI_FAILURE(status)) {
 409                 return_ACPI_STATUS(status);
 410         }
 411
 412         /* Validate/Allocate/Clear caller buffer */
 413
 414         status =
 415             acpi_ut_initialize_buffer(out_buffer,
 416                                       sizeof(struct acpi_system_info));
 417         if (ACPI_FAILURE(status)) {
 418                 return_ACPI_STATUS(status);
 419         }
 420
 421         /*
 422          * Populate the return buffer
 423          */
 424         info_ptr = (struct acpi_system_info *)out_buffer->pointer;
 425
 426         info_ptr->acpi_ca_version = ACPI_CA_VERSION;
 427
 428         /* System flags (ACPI capabilities) */
 429
 430         info_ptr->flags = ACPI_SYS_MODE_ACPI;
 431
 432         /* Timer resolution - 24 or 32 bits  */
 433
 434         if (!acpi_gbl_FADT) {
 435                 info_ptr->timer_resolution = 0;
 436         } else if (acpi_gbl_FADT->tmr_val_ext == 0) {
 437                 info_ptr->timer_resolution = 24;
 438         } else {
 439                 info_ptr->timer_resolution = 32;
 440         }
 441
 442         /* Clear the reserved fields */
 443
 444         info_ptr->reserved1 = 0;
 445         info_ptr->reserved2 = 0;
 446
 447         /* Current debug levels */
 448
 449         info_ptr->debug_layer = acpi_dbg_layer;
 450         info_ptr->debug_level = acpi_dbg_level;
 451
 452         /* Current status of the ACPI tables, per table type */
 453
 454         info_ptr->num_table_types = NUM_ACPI_TABLE_TYPES;
 455         for (i = 0; i < NUM_ACPI_TABLE_TYPES; i++) {
 456                 info_ptr->table_info[i].count = acpi_gbl_table_lists[i].count;
 457         }
 458
 459         return_ACPI_STATUS(AE_OK);
 460 }
 461
 462 EXPORT_SYMBOL(acpi_get_system_info);
 463
 464 /*****************************************************************************
 465  *
 466  * FUNCTION:    acpi_install_initialization_handler
 467  *
 468  * PARAMETERS:  Handler             - Callback procedure
 469  *              Function            - Not (currently) used, see below
 470  *
 471  * RETURN:      Status
 472  *
 473  * DESCRIPTION: Install an initialization handler
 474  *
 475  * TBD: When a second function is added, must save the Function also.
 476  *
 477  ****************************************************************************/
 478
 479 acpi_status
 480 acpi_install_initialization_handler(acpi_init_handler handler, u32 function)
 481 {
 482
 483         if (!handler) {
 484                 return (AE_BAD_PARAMETER);
 485         }
 486
 487         if (acpi_gbl_init_handler) {
 488                 return (AE_ALREADY_EXISTS);
 489         }
 490
 491         acpi_gbl_init_handler = handler;
 492         return AE_OK;
 493 }
 494
 495 #endif                          /*  ACPI_FUTURE_USAGE  */
 496
 497 /*****************************************************************************
 498  *
 499  * FUNCTION:    acpi_purge_cached_objects
 500  *
 501  * PARAMETERS:  None
 502  *
 503  * RETURN:      Status
 504  *
 505  * DESCRIPTION: Empty all caches (delete the cached objects)
 506  *
 507  ****************************************************************************/
 508
 509 acpi_status acpi_purge_cached_objects(void)
 510 {
 511         ACPI_FUNCTION_TRACE("acpi_purge_cached_objects");
 512
 513         (void)acpi_os_purge_cache(acpi_gbl_state_cache);
 514         (void)acpi_os_purge_cache(acpi_gbl_operand_cache);
 515         (void)acpi_os_purge_cache(acpi_gbl_ps_node_cache);
 516         (void)acpi_os_purge_cache(acpi_gbl_ps_node_ext_cache);
 517         return_ACPI_STATUS(AE_OK);
 518 }