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          * NOTE: 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 initialized before
 184          * execution!
 185          */
 186         if (!(flags & ACPI_NO_EVENT_INIT)) {
 187                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 188                                   "[Init] Initializing ACPI events\n"));
 189
 190                 status = acpi_ev_initialize_events();
 191                 if (ACPI_FAILURE(status)) {
 192                         return_ACPI_STATUS(status);
 193                 }
 194         }
 195
 196         /* Install the SCI handler and Global Lock handler */
 197
 198         if (!(flags & ACPI_NO_HANDLER_INIT)) {
 199                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 200                                   "[Init] Installing SCI/GL handlers\n"));
 201
 202                 status = acpi_ev_install_xrupt_handlers();
 203                 if (ACPI_FAILURE(status)) {
 204                         return_ACPI_STATUS(status);
 205                 }
 206         }
 207
 208         return_ACPI_STATUS(status);
 209 }
 210
 211 /*******************************************************************************
 212  *
 213  * FUNCTION:    acpi_initialize_objects
 214  *
 215  * PARAMETERS:  Flags           - Init/enable Options
 216  *
 217  * RETURN:      Status
 218  *
 219  * DESCRIPTION: Completes namespace initialization by initializing device
 220  *              objects and executing AML code for Regions, buffers, etc.
 221  *
 222  ******************************************************************************/
 223
 224 acpi_status acpi_initialize_objects(u32 flags)
 225 {
 226         acpi_status status = AE_OK;
 227
 228         ACPI_FUNCTION_TRACE("acpi_initialize_objects");
 229
 230         /*
 231          * Run all _REG methods
 232          *
 233          * NOTE: Any objects accessed
 234          * by the _REG methods will be automatically initialized, even if they
 235          * contain executable AML (see call to acpi_ns_initialize_objects below).
 236          */
 237         if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
 238                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 239                                   "[Init] Executing _REG op_region methods\n"));
 240
 241                 status = acpi_ev_initialize_op_regions();
 242                 if (ACPI_FAILURE(status)) {
 243                         return_ACPI_STATUS(status);
 244                 }
 245         }
 246
 247         /*
 248          * Initialize the objects that remain uninitialized.  This
 249          * runs the executable AML that may be part of the declaration of these
 250          * objects: operation_regions, buffer_fields, Buffers, and Packages.
 251          */
 252         if (!(flags & ACPI_NO_OBJECT_INIT)) {
 253                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 254                                   "[Init] Completing Initialization of ACPI Objects\n"));
 255
 256                 status = acpi_ns_initialize_objects();
 257                 if (ACPI_FAILURE(status)) {
 258                         return_ACPI_STATUS(status);
 259                 }
 260         }
 261
 262         /*
 263          * Initialize all device objects in the namespace
 264          * This runs the _STA and _INI methods.
 265          */
 266         if (!(flags & ACPI_NO_DEVICE_INIT)) {
 267                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 268                                   "[Init] Initializing ACPI Devices\n"));
 269
 270                 status = acpi_ns_initialize_devices();
 271                 if (ACPI_FAILURE(status)) {
 272                         return_ACPI_STATUS(status);
 273                 }
 274         }
 275
 276         /*
 277          * Empty the caches (delete the cached objects) on the assumption that
 278          * the table load filled them up more than they will be at runtime --
 279          * thus wasting non-paged memory.
 280          */
 281         status = acpi_purge_cached_objects();
 282
 283         acpi_gbl_startup_flags |= ACPI_INITIALIZED_OK;
 284         return_ACPI_STATUS(status);
 285 }
 286
 287 /*******************************************************************************
 288  *
 289  * FUNCTION:    acpi_terminate
 290  *
 291  * PARAMETERS:  None
 292  *
 293  * RETURN:      Status
 294  *
 295  * DESCRIPTION: Shutdown the ACPI subsystem.  Release all resources.
 296  *
 297  ******************************************************************************/
 298
 299 acpi_status acpi_terminate(void)
 300 {
 301         acpi_status status;
 302
 303         ACPI_FUNCTION_TRACE("acpi_terminate");
 304
 305         /* Terminate the AML Debugger if present */
 306
 307         ACPI_DEBUGGER_EXEC(acpi_gbl_db_terminate_threads = TRUE);
 308
 309         /* Shutdown and free all resources */
 310
 311         acpi_ut_subsystem_shutdown();
 312
 313         /* Free the mutex objects */
 314
 315         acpi_ut_mutex_terminate();
 316
 317 #ifdef ACPI_DEBUGGER
 318
 319         /* Shut down the debugger */
 320
 321         acpi_db_terminate();
 322 #endif
 323
 324         /* Now we can shutdown the OS-dependent layer */
 325
 326         status = acpi_os_terminate();
 327         return_ACPI_STATUS(status);
 328 }
 329
 330 #ifdef ACPI_FUTURE_USAGE
 331 /*******************************************************************************
 332  *
 333  * FUNCTION:    acpi_subsystem_status
 334  *
 335  * PARAMETERS:  None
 336  *
 337  * RETURN:      Status of the ACPI subsystem
 338  *
 339  * DESCRIPTION: Other drivers that use the ACPI subsystem should call this
 340  *              before making any other calls, to ensure the subsystem
 341  *              initialized successfully.
 342  *
 343  ******************************************************************************/
 344
 345 acpi_status acpi_subsystem_status(void)
 346 {
 347
 348         if (acpi_gbl_startup_flags & ACPI_INITIALIZED_OK) {
 349                 return (AE_OK);
 350         } else {
 351                 return (AE_ERROR);
 352         }
 353 }
 354
 355 /*******************************************************************************
 356  *
 357  * FUNCTION:    acpi_get_system_info
 358  *
 359  * PARAMETERS:  out_buffer      - A buffer to receive the resources for the
 360  *                                device
 361  *
 362  * RETURN:      Status          - the status of the call
 363  *
 364  * DESCRIPTION: This function is called to get information about the current
 365  *              state of the ACPI subsystem.  It will return system information
 366  *              in the out_buffer.
 367  *
 368  *              If the function fails an appropriate status will be returned
 369  *              and the value of out_buffer is undefined.
 370  *
 371  ******************************************************************************/
 372
 373 acpi_status acpi_get_system_info(struct acpi_buffer * out_buffer)
 374 {
 375         struct acpi_system_info *info_ptr;
 376         acpi_status status;
 377         u32 i;
 378
 379         ACPI_FUNCTION_TRACE("acpi_get_system_info");
 380
 381         /* Parameter validation */
 382
 383         status = acpi_ut_validate_buffer(out_buffer);
 384         if (ACPI_FAILURE(status)) {
 385                 return_ACPI_STATUS(status);
 386         }
 387
 388         /* Validate/Allocate/Clear caller buffer */
 389
 390         status =
 391             acpi_ut_initialize_buffer(out_buffer,
 392                                       sizeof(struct acpi_system_info));
 393         if (ACPI_FAILURE(status)) {
 394                 return_ACPI_STATUS(status);
 395         }
 396
 397         /*
 398          * Populate the return buffer
 399          */
 400         info_ptr = (struct acpi_system_info *)out_buffer->pointer;
 401
 402         info_ptr->acpi_ca_version = ACPI_CA_VERSION;
 403
 404         /* System flags (ACPI capabilities) */
 405
 406         info_ptr->flags = ACPI_SYS_MODE_ACPI;
 407
 408         /* Timer resolution - 24 or 32 bits  */
 409
 410         if (!acpi_gbl_FADT) {
 411                 info_ptr->timer_resolution = 0;
 412         } else if (acpi_gbl_FADT->tmr_val_ext == 0) {
 413                 info_ptr->timer_resolution = 24;
 414         } else {
 415                 info_ptr->timer_resolution = 32;
 416         }
 417
 418         /* Clear the reserved fields */
 419
 420         info_ptr->reserved1 = 0;
 421         info_ptr->reserved2 = 0;
 422
 423         /* Current debug levels */
 424
 425         info_ptr->debug_layer = acpi_dbg_layer;
 426         info_ptr->debug_level = acpi_dbg_level;
 427
 428         /* Current status of the ACPI tables, per table type */
 429
 430         info_ptr->num_table_types = NUM_ACPI_TABLE_TYPES;
 431         for (i = 0; i < NUM_ACPI_TABLE_TYPES; i++) {
 432                 info_ptr->table_info[i].count = acpi_gbl_table_lists[i].count;
 433         }
 434
 435         return_ACPI_STATUS(AE_OK);
 436 }
 437
 438 EXPORT_SYMBOL(acpi_get_system_info);
 439
 440 /*****************************************************************************
 441  *
 442  * FUNCTION:    acpi_install_initialization_handler
 443  *
 444  * PARAMETERS:  Handler             - Callback procedure
 445  *              Function            - Not (currently) used, see below
 446  *
 447  * RETURN:      Status
 448  *
 449  * DESCRIPTION: Install an initialization handler
 450  *
 451  * TBD: When a second function is added, must save the Function also.
 452  *
 453  ****************************************************************************/
 454
 455 acpi_status
 456 acpi_install_initialization_handler(acpi_init_handler handler, u32 function)
 457 {
 458
 459         if (!handler) {
 460                 return (AE_BAD_PARAMETER);
 461         }
 462
 463         if (acpi_gbl_init_handler) {
 464                 return (AE_ALREADY_EXISTS);
 465         }
 466
 467         acpi_gbl_init_handler = handler;
 468         return AE_OK;
 469 }
 470
 471 #endif                          /*  ACPI_FUTURE_USAGE  */
 472
 473 /*****************************************************************************
 474  *
 475  * FUNCTION:    acpi_purge_cached_objects
 476  *
 477  * PARAMETERS:  None
 478  *
 479  * RETURN:      Status
 480  *
 481  * DESCRIPTION: Empty all caches (delete the cached objects)
 482  *
 483  ****************************************************************************/
 484
 485 acpi_status acpi_purge_cached_objects(void)
 486 {
 487         ACPI_FUNCTION_TRACE("acpi_purge_cached_objects");
 488
 489         (void)acpi_os_purge_cache(acpi_gbl_state_cache);
 490         (void)acpi_os_purge_cache(acpi_gbl_operand_cache);
 491         (void)acpi_os_purge_cache(acpi_gbl_ps_node_cache);
 492         (void)acpi_os_purge_cache(acpi_gbl_ps_node_ext_cache);
 493         return_ACPI_STATUS(AE_OK);
 494 }