Revert "ARM: tegra: tegratab: dummy change"
[linux-2.6.git] / drivers / acpi / acpica / utxface.c
1 /******************************************************************************
2  *
3  * Module Name: utxface - External interfaces for "global" ACPI functions
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2012, Intel Corp.
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/export.h>
45 #include <acpi/acpi.h>
46 #include "accommon.h"
47 #include "acevents.h"
48 #include "acnamesp.h"
49 #include "acdebug.h"
50 #include "actables.h"
51 #include "acinterp.h"
52
53 #define _COMPONENT          ACPI_UTILITIES
54 ACPI_MODULE_NAME("utxface")
55
56 #ifndef ACPI_ASL_COMPILER
57 /*******************************************************************************
58  *
59  * FUNCTION:    acpi_initialize_subsystem
60  *
61  * PARAMETERS:  None
62  *
63  * RETURN:      Status
64  *
65  * DESCRIPTION: Initializes all global variables.  This is the first function
66  *              called, so any early initialization belongs here.
67  *
68  ******************************************************************************/
69 acpi_status __init acpi_initialize_subsystem(void)
70 {
71         acpi_status status;
72
73         ACPI_FUNCTION_TRACE(acpi_initialize_subsystem);
74
75         acpi_gbl_startup_flags = ACPI_SUBSYSTEM_INITIALIZE;
76         ACPI_DEBUG_EXEC(acpi_ut_init_stack_ptr_trace());
77
78         /* Initialize the OS-Dependent layer */
79
80         status = acpi_os_initialize();
81         if (ACPI_FAILURE(status)) {
82                 ACPI_EXCEPTION((AE_INFO, status, "During OSL initialization"));
83                 return_ACPI_STATUS(status);
84         }
85
86         /* Initialize all globals used by the subsystem */
87
88         status = acpi_ut_init_globals();
89         if (ACPI_FAILURE(status)) {
90                 ACPI_EXCEPTION((AE_INFO, status,
91                                 "During initialization of globals"));
92                 return_ACPI_STATUS(status);
93         }
94
95         /* Create the default mutex objects */
96
97         status = acpi_ut_mutex_initialize();
98         if (ACPI_FAILURE(status)) {
99                 ACPI_EXCEPTION((AE_INFO, status,
100                                 "During Global Mutex creation"));
101                 return_ACPI_STATUS(status);
102         }
103
104         /*
105          * Initialize the namespace manager and
106          * the root of the namespace tree
107          */
108         status = acpi_ns_root_initialize();
109         if (ACPI_FAILURE(status)) {
110                 ACPI_EXCEPTION((AE_INFO, status,
111                                 "During Namespace initialization"));
112                 return_ACPI_STATUS(status);
113         }
114
115         /* Initialize the global OSI interfaces list with the static names */
116
117         status = acpi_ut_initialize_interfaces();
118         if (ACPI_FAILURE(status)) {
119                 ACPI_EXCEPTION((AE_INFO, status,
120                                 "During OSI interfaces initialization"));
121                 return_ACPI_STATUS(status);
122         }
123
124         /* If configured, initialize the AML debugger */
125
126         ACPI_DEBUGGER_EXEC(status = acpi_db_initialize());
127         return_ACPI_STATUS(status);
128 }
129
130 /*******************************************************************************
131  *
132  * FUNCTION:    acpi_enable_subsystem
133  *
134  * PARAMETERS:  Flags           - Init/enable Options
135  *
136  * RETURN:      Status
137  *
138  * DESCRIPTION: Completes the subsystem initialization including hardware.
139  *              Puts system into ACPI mode if it isn't already.
140  *
141  ******************************************************************************/
142 acpi_status acpi_enable_subsystem(u32 flags)
143 {
144         acpi_status status = AE_OK;
145
146         ACPI_FUNCTION_TRACE(acpi_enable_subsystem);
147
148 #if (!ACPI_REDUCED_HARDWARE)
149
150         /* Enable ACPI mode */
151
152         if (!(flags & ACPI_NO_ACPI_ENABLE)) {
153                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
154                                   "[Init] Going into ACPI mode\n"));
155
156                 acpi_gbl_original_mode = acpi_hw_get_mode();
157
158                 status = acpi_enable();
159                 if (ACPI_FAILURE(status)) {
160                         ACPI_WARNING((AE_INFO, "AcpiEnable failed"));
161                         return_ACPI_STATUS(status);
162                 }
163         }
164
165         /*
166          * Obtain a permanent mapping for the FACS. This is required for the
167          * Global Lock and the Firmware Waking Vector
168          */
169         status = acpi_tb_initialize_facs();
170         if (ACPI_FAILURE(status)) {
171                 ACPI_WARNING((AE_INFO, "Could not map the FACS table"));
172                 return_ACPI_STATUS(status);
173         }
174 #endif                          /* !ACPI_REDUCED_HARDWARE */
175
176         /*
177          * Install the default op_region handlers. These are installed unless
178          * other handlers have already been installed via the
179          * install_address_space_handler interface.
180          */
181         if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
182                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
183                                   "[Init] Installing default address space handlers\n"));
184
185                 status = acpi_ev_install_region_handlers();
186                 if (ACPI_FAILURE(status)) {
187                         return_ACPI_STATUS(status);
188                 }
189         }
190 #if (!ACPI_REDUCED_HARDWARE)
191         /*
192          * Initialize ACPI Event handling (Fixed and General Purpose)
193          *
194          * Note1: We must have the hardware and events initialized before we can
195          * execute any control methods safely. Any control method can require
196          * ACPI hardware support, so the hardware must be fully initialized before
197          * any method execution!
198          *
199          * Note2: Fixed events are initialized and enabled here. GPEs are
200          * initialized, but cannot be enabled until after the hardware is
201          * completely initialized (SCI and global_lock activated)
202          */
203         if (!(flags & ACPI_NO_EVENT_INIT)) {
204                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
205                                   "[Init] Initializing ACPI events\n"));
206
207                 status = acpi_ev_initialize_events();
208                 if (ACPI_FAILURE(status)) {
209                         return_ACPI_STATUS(status);
210                 }
211         }
212
213         /*
214          * Install the SCI handler and Global Lock handler. This completes the
215          * hardware initialization.
216          */
217         if (!(flags & ACPI_NO_HANDLER_INIT)) {
218                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
219                                   "[Init] Installing SCI/GL handlers\n"));
220
221                 status = acpi_ev_install_xrupt_handlers();
222                 if (ACPI_FAILURE(status)) {
223                         return_ACPI_STATUS(status);
224                 }
225         }
226 #endif                          /* !ACPI_REDUCED_HARDWARE */
227
228         return_ACPI_STATUS(status);
229 }
230
231 ACPI_EXPORT_SYMBOL(acpi_enable_subsystem)
232
233 /*******************************************************************************
234  *
235  * FUNCTION:    acpi_initialize_objects
236  *
237  * PARAMETERS:  Flags           - Init/enable Options
238  *
239  * RETURN:      Status
240  *
241  * DESCRIPTION: Completes namespace initialization by initializing device
242  *              objects and executing AML code for Regions, buffers, etc.
243  *
244  ******************************************************************************/
245 acpi_status acpi_initialize_objects(u32 flags)
246 {
247         acpi_status status = AE_OK;
248
249         ACPI_FUNCTION_TRACE(acpi_initialize_objects);
250
251         /*
252          * Run all _REG methods
253          *
254          * Note: Any objects accessed by the _REG methods will be automatically
255          * initialized, even if they contain executable AML (see the call to
256          * acpi_ns_initialize_objects below).
257          */
258         if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
259                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
260                                   "[Init] Executing _REG OpRegion methods\n"));
261
262                 status = acpi_ev_initialize_op_regions();
263                 if (ACPI_FAILURE(status)) {
264                         return_ACPI_STATUS(status);
265                 }
266         }
267
268         /*
269          * Execute any module-level code that was detected during the table load
270          * phase. Although illegal since ACPI 2.0, there are many machines that
271          * contain this type of code. Each block of detected executable AML code
272          * outside of any control method is wrapped with a temporary control
273          * method object and placed on a global list. The methods on this list
274          * are executed below.
275          */
276         acpi_ns_exec_module_code_list();
277
278         /*
279          * Initialize the objects that remain uninitialized. This runs the
280          * executable AML that may be part of the declaration of these objects:
281          * operation_regions, buffer_fields, Buffers, and Packages.
282          */
283         if (!(flags & ACPI_NO_OBJECT_INIT)) {
284                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
285                                   "[Init] Completing Initialization of ACPI Objects\n"));
286
287                 status = acpi_ns_initialize_objects();
288                 if (ACPI_FAILURE(status)) {
289                         return_ACPI_STATUS(status);
290                 }
291         }
292
293         /*
294          * Initialize all device objects in the namespace. This runs the device
295          * _STA and _INI methods.
296          */
297         if (!(flags & ACPI_NO_DEVICE_INIT)) {
298                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
299                                   "[Init] Initializing ACPI Devices\n"));
300
301                 status = acpi_ns_initialize_devices();
302                 if (ACPI_FAILURE(status)) {
303                         return_ACPI_STATUS(status);
304                 }
305         }
306
307         /*
308          * Empty the caches (delete the cached objects) on the assumption that
309          * the table load filled them up more than they will be at runtime --
310          * thus wasting non-paged memory.
311          */
312         status = acpi_purge_cached_objects();
313
314         acpi_gbl_startup_flags |= ACPI_INITIALIZED_OK;
315         return_ACPI_STATUS(status);
316 }
317
318 ACPI_EXPORT_SYMBOL(acpi_initialize_objects)
319
320 #endif
321 /*******************************************************************************
322  *
323  * FUNCTION:    acpi_terminate
324  *
325  * PARAMETERS:  None
326  *
327  * RETURN:      Status
328  *
329  * DESCRIPTION: Shutdown the ACPICA subsystem and release all resources.
330  *
331  ******************************************************************************/
332 acpi_status acpi_terminate(void)
333 {
334         acpi_status status;
335
336         ACPI_FUNCTION_TRACE(acpi_terminate);
337
338         /* Just exit if subsystem is already shutdown */
339
340         if (acpi_gbl_shutdown) {
341                 ACPI_ERROR((AE_INFO, "ACPI Subsystem is already terminated"));
342                 return_ACPI_STATUS(AE_OK);
343         }
344
345         /* Subsystem appears active, go ahead and shut it down */
346
347         acpi_gbl_shutdown = TRUE;
348         acpi_gbl_startup_flags = 0;
349         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Shutting down ACPI Subsystem\n"));
350
351         /* Terminate the AML Debugger if present */
352
353         ACPI_DEBUGGER_EXEC(acpi_gbl_db_terminate_threads = TRUE);
354
355         /* Shutdown and free all resources */
356
357         acpi_ut_subsystem_shutdown();
358
359         /* Free the mutex objects */
360
361         acpi_ut_mutex_terminate();
362
363 #ifdef ACPI_DEBUGGER
364
365         /* Shut down the debugger */
366
367         acpi_db_terminate();
368 #endif
369
370         /* Now we can shutdown the OS-dependent layer */
371
372         status = acpi_os_terminate();
373         return_ACPI_STATUS(status);
374 }
375
376 ACPI_EXPORT_SYMBOL(acpi_terminate)
377
378 #ifndef ACPI_ASL_COMPILER
379 #ifdef ACPI_FUTURE_USAGE
380 /*******************************************************************************
381  *
382  * FUNCTION:    acpi_subsystem_status
383  *
384  * PARAMETERS:  None
385  *
386  * RETURN:      Status of the ACPI subsystem
387  *
388  * DESCRIPTION: Other drivers that use the ACPI subsystem should call this
389  *              before making any other calls, to ensure the subsystem
390  *              initialized successfully.
391  *
392  ******************************************************************************/
393 acpi_status acpi_subsystem_status(void)
394 {
395
396         if (acpi_gbl_startup_flags & ACPI_INITIALIZED_OK) {
397                 return (AE_OK);
398         } else {
399                 return (AE_ERROR);
400         }
401 }
402
403 ACPI_EXPORT_SYMBOL(acpi_subsystem_status)
404
405 /*******************************************************************************
406  *
407  * FUNCTION:    acpi_get_system_info
408  *
409  * PARAMETERS:  out_buffer      - A buffer to receive the resources for the
410  *                                device
411  *
412  * RETURN:      Status          - the status of the call
413  *
414  * DESCRIPTION: This function is called to get information about the current
415  *              state of the ACPI subsystem.  It will return system information
416  *              in the out_buffer.
417  *
418  *              If the function fails an appropriate status will be returned
419  *              and the value of out_buffer is undefined.
420  *
421  ******************************************************************************/
422 acpi_status acpi_get_system_info(struct acpi_buffer * out_buffer)
423 {
424         struct acpi_system_info *info_ptr;
425         acpi_status status;
426
427         ACPI_FUNCTION_TRACE(acpi_get_system_info);
428
429         /* Parameter validation */
430
431         status = acpi_ut_validate_buffer(out_buffer);
432         if (ACPI_FAILURE(status)) {
433                 return_ACPI_STATUS(status);
434         }
435
436         /* Validate/Allocate/Clear caller buffer */
437
438         status =
439             acpi_ut_initialize_buffer(out_buffer,
440                                       sizeof(struct acpi_system_info));
441         if (ACPI_FAILURE(status)) {
442                 return_ACPI_STATUS(status);
443         }
444
445         /*
446          * Populate the return buffer
447          */
448         info_ptr = (struct acpi_system_info *)out_buffer->pointer;
449
450         info_ptr->acpi_ca_version = ACPI_CA_VERSION;
451
452         /* System flags (ACPI capabilities) */
453
454         info_ptr->flags = ACPI_SYS_MODE_ACPI;
455
456         /* Timer resolution - 24 or 32 bits  */
457
458         if (acpi_gbl_FADT.flags & ACPI_FADT_32BIT_TIMER) {
459                 info_ptr->timer_resolution = 24;
460         } else {
461                 info_ptr->timer_resolution = 32;
462         }
463
464         /* Clear the reserved fields */
465
466         info_ptr->reserved1 = 0;
467         info_ptr->reserved2 = 0;
468
469         /* Current debug levels */
470
471         info_ptr->debug_layer = acpi_dbg_layer;
472         info_ptr->debug_level = acpi_dbg_level;
473
474         return_ACPI_STATUS(AE_OK);
475 }
476
477 ACPI_EXPORT_SYMBOL(acpi_get_system_info)
478
479 /*****************************************************************************
480  *
481  * FUNCTION:    acpi_install_initialization_handler
482  *
483  * PARAMETERS:  Handler             - Callback procedure
484  *              Function            - Not (currently) used, see below
485  *
486  * RETURN:      Status
487  *
488  * DESCRIPTION: Install an initialization handler
489  *
490  * TBD: When a second function is added, must save the Function also.
491  *
492  ****************************************************************************/
493 acpi_status
494 acpi_install_initialization_handler(acpi_init_handler handler, u32 function)
495 {
496
497         if (!handler) {
498                 return (AE_BAD_PARAMETER);
499         }
500
501         if (acpi_gbl_init_handler) {
502                 return (AE_ALREADY_EXISTS);
503         }
504
505         acpi_gbl_init_handler = handler;
506         return AE_OK;
507 }
508
509 ACPI_EXPORT_SYMBOL(acpi_install_initialization_handler)
510 #endif                          /*  ACPI_FUTURE_USAGE  */
511
512 /*****************************************************************************
513  *
514  * FUNCTION:    acpi_purge_cached_objects
515  *
516  * PARAMETERS:  None
517  *
518  * RETURN:      Status
519  *
520  * DESCRIPTION: Empty all caches (delete the cached objects)
521  *
522  ****************************************************************************/
523 acpi_status acpi_purge_cached_objects(void)
524 {
525         ACPI_FUNCTION_TRACE(acpi_purge_cached_objects);
526
527         (void)acpi_os_purge_cache(acpi_gbl_state_cache);
528         (void)acpi_os_purge_cache(acpi_gbl_operand_cache);
529         (void)acpi_os_purge_cache(acpi_gbl_ps_node_cache);
530         (void)acpi_os_purge_cache(acpi_gbl_ps_node_ext_cache);
531         return_ACPI_STATUS(AE_OK);
532 }
533
534 ACPI_EXPORT_SYMBOL(acpi_purge_cached_objects)
535
536 /*****************************************************************************
537  *
538  * FUNCTION:    acpi_install_interface
539  *
540  * PARAMETERS:  interface_name      - The interface to install
541  *
542  * RETURN:      Status
543  *
544  * DESCRIPTION: Install an _OSI interface to the global list
545  *
546  ****************************************************************************/
547 acpi_status acpi_install_interface(acpi_string interface_name)
548 {
549         acpi_status status;
550         struct acpi_interface_info *interface_info;
551
552         /* Parameter validation */
553
554         if (!interface_name || (ACPI_STRLEN(interface_name) == 0)) {
555                 return (AE_BAD_PARAMETER);
556         }
557
558         (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
559
560         /* Check if the interface name is already in the global list */
561
562         interface_info = acpi_ut_get_interface(interface_name);
563         if (interface_info) {
564                 /*
565                  * The interface already exists in the list. This is OK if the
566                  * interface has been marked invalid -- just clear the bit.
567                  */
568                 if (interface_info->flags & ACPI_OSI_INVALID) {
569                         interface_info->flags &= ~ACPI_OSI_INVALID;
570                         status = AE_OK;
571                 } else {
572                         status = AE_ALREADY_EXISTS;
573                 }
574         } else {
575                 /* New interface name, install into the global list */
576
577                 status = acpi_ut_install_interface(interface_name);
578         }
579
580         acpi_os_release_mutex(acpi_gbl_osi_mutex);
581         return (status);
582 }
583
584 ACPI_EXPORT_SYMBOL(acpi_install_interface)
585
586 /*****************************************************************************
587  *
588  * FUNCTION:    acpi_remove_interface
589  *
590  * PARAMETERS:  interface_name      - The interface to remove
591  *
592  * RETURN:      Status
593  *
594  * DESCRIPTION: Remove an _OSI interface from the global list
595  *
596  ****************************************************************************/
597 acpi_status acpi_remove_interface(acpi_string interface_name)
598 {
599         acpi_status status;
600
601         /* Parameter validation */
602
603         if (!interface_name || (ACPI_STRLEN(interface_name) == 0)) {
604                 return (AE_BAD_PARAMETER);
605         }
606
607         (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
608
609         status = acpi_ut_remove_interface(interface_name);
610
611         acpi_os_release_mutex(acpi_gbl_osi_mutex);
612         return (status);
613 }
614
615 ACPI_EXPORT_SYMBOL(acpi_remove_interface)
616
617 /*****************************************************************************
618  *
619  * FUNCTION:    acpi_install_interface_handler
620  *
621  * PARAMETERS:  Handler             - The _OSI interface handler to install
622  *                                    NULL means "remove existing handler"
623  *
624  * RETURN:      Status
625  *
626  * DESCRIPTION: Install a handler for the predefined _OSI ACPI method.
627  *              invoked during execution of the internal implementation of
628  *              _OSI. A NULL handler simply removes any existing handler.
629  *
630  ****************************************************************************/
631 acpi_status acpi_install_interface_handler(acpi_interface_handler handler)
632 {
633         acpi_status status = AE_OK;
634
635         (void)acpi_os_acquire_mutex(acpi_gbl_osi_mutex, ACPI_WAIT_FOREVER);
636
637         if (handler && acpi_gbl_interface_handler) {
638                 status = AE_ALREADY_EXISTS;
639         } else {
640                 acpi_gbl_interface_handler = handler;
641         }
642
643         acpi_os_release_mutex(acpi_gbl_osi_mutex);
644         return (status);
645 }
646
647 ACPI_EXPORT_SYMBOL(acpi_install_interface_handler)
648
649 /*****************************************************************************
650  *
651  * FUNCTION:    acpi_check_address_range
652  *
653  * PARAMETERS:  space_id            - Address space ID
654  *              Address             - Start address
655  *              Length              - Length
656  *              Warn                - TRUE if warning on overlap desired
657  *
658  * RETURN:      Count of the number of conflicts detected.
659  *
660  * DESCRIPTION: Check if the input address range overlaps any of the
661  *              ASL operation region address ranges.
662  *
663  ****************************************************************************/
664 u32
665 acpi_check_address_range(acpi_adr_space_type space_id,
666                          acpi_physical_address address,
667                          acpi_size length, u8 warn)
668 {
669         u32 overlaps;
670         acpi_status status;
671
672         status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
673         if (ACPI_FAILURE(status)) {
674                 return (0);
675         }
676
677         overlaps = acpi_ut_check_address_range(space_id, address,
678                                                (u32)length, warn);
679
680         (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
681         return (overlaps);
682 }
683
684 ACPI_EXPORT_SYMBOL(acpi_check_address_range)
685 #endif                          /* !ACPI_ASL_COMPILER */