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ACPI / ACPICA: Do not execute _PRW methods during initialization
[mv-sheeva.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 - 2010, 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 <acpi/acpi.h>
45 #include "accommon.h"
46 #include "acevents.h"
47 #include "acnamesp.h"
48 #include "acdebug.h"
49 #include "actables.h"
50
51 #define _COMPONENT          ACPI_UTILITIES
52 ACPI_MODULE_NAME("utxface")
53
54 #ifndef ACPI_ASL_COMPILER
55 /*******************************************************************************
56  *
57  * FUNCTION:    acpi_initialize_subsystem
58  *
59  * PARAMETERS:  None
60  *
61  * RETURN:      Status
62  *
63  * DESCRIPTION: Initializes all global variables.  This is the first function
64  *              called, so any early initialization belongs here.
65  *
66  ******************************************************************************/
67 acpi_status __init acpi_initialize_subsystem(void)
68 {
69         acpi_status status;
70
71         ACPI_FUNCTION_TRACE(acpi_initialize_subsystem);
72
73         acpi_gbl_startup_flags = ACPI_SUBSYSTEM_INITIALIZE;
74         ACPI_DEBUG_EXEC(acpi_ut_init_stack_ptr_trace());
75
76         /* Initialize the OS-Dependent layer */
77
78         status = acpi_os_initialize();
79         if (ACPI_FAILURE(status)) {
80                 ACPI_EXCEPTION((AE_INFO, status, "During OSL initialization"));
81                 return_ACPI_STATUS(status);
82         }
83
84         /* Initialize all globals used by the subsystem */
85
86         status = acpi_ut_init_globals();
87         if (ACPI_FAILURE(status)) {
88                 ACPI_EXCEPTION((AE_INFO, status,
89                                 "During initialization of globals"));
90                 return_ACPI_STATUS(status);
91         }
92
93         /* Create the default mutex objects */
94
95         status = acpi_ut_mutex_initialize();
96         if (ACPI_FAILURE(status)) {
97                 ACPI_EXCEPTION((AE_INFO, status,
98                                 "During Global Mutex creation"));
99                 return_ACPI_STATUS(status);
100         }
101
102         /*
103          * Initialize the namespace manager and
104          * the root of the namespace tree
105          */
106         status = acpi_ns_root_initialize();
107         if (ACPI_FAILURE(status)) {
108                 ACPI_EXCEPTION((AE_INFO, status,
109                                 "During Namespace initialization"));
110                 return_ACPI_STATUS(status);
111         }
112
113         /* If configured, initialize the AML debugger */
114
115         ACPI_DEBUGGER_EXEC(status = acpi_db_initialize());
116         return_ACPI_STATUS(status);
117 }
118
119 /*******************************************************************************
120  *
121  * FUNCTION:    acpi_enable_subsystem
122  *
123  * PARAMETERS:  Flags           - Init/enable Options
124  *
125  * RETURN:      Status
126  *
127  * DESCRIPTION: Completes the subsystem initialization including hardware.
128  *              Puts system into ACPI mode if it isn't already.
129  *
130  ******************************************************************************/
131 acpi_status acpi_enable_subsystem(u32 flags)
132 {
133         acpi_status status = AE_OK;
134
135         ACPI_FUNCTION_TRACE(acpi_enable_subsystem);
136
137         /* Enable ACPI mode */
138
139         if (!(flags & ACPI_NO_ACPI_ENABLE)) {
140                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
141                                   "[Init] Going into ACPI mode\n"));
142
143                 acpi_gbl_original_mode = acpi_hw_get_mode();
144
145                 status = acpi_enable();
146                 if (ACPI_FAILURE(status)) {
147                         ACPI_WARNING((AE_INFO, "AcpiEnable failed"));
148                         return_ACPI_STATUS(status);
149                 }
150         }
151
152         /*
153          * Obtain a permanent mapping for the FACS. This is required for the
154          * Global Lock and the Firmware Waking Vector
155          */
156         status = acpi_tb_initialize_facs();
157         if (ACPI_FAILURE(status)) {
158                 ACPI_WARNING((AE_INFO, "Could not map the FACS table"));
159                 return_ACPI_STATUS(status);
160         }
161
162         /*
163          * Install the default op_region handlers. These are installed unless
164          * other handlers have already been installed via the
165          * install_address_space_handler interface.
166          */
167         if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
168                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
169                                   "[Init] Installing default address space handlers\n"));
170
171                 status = acpi_ev_install_region_handlers();
172                 if (ACPI_FAILURE(status)) {
173                         return_ACPI_STATUS(status);
174                 }
175         }
176
177         /*
178          * Initialize ACPI Event handling (Fixed and General Purpose)
179          *
180          * Note1: We must have the hardware and events initialized before we can
181          * execute any control methods safely. Any control method can require
182          * ACPI hardware support, so the hardware must be fully initialized before
183          * any method execution!
184          *
185          * Note2: Fixed events are initialized and enabled here. GPEs are
186          * initialized, but cannot be enabled until after the hardware is
187          * completely initialized (SCI and global_lock activated)
188          */
189         if (!(flags & ACPI_NO_EVENT_INIT)) {
190                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
191                                   "[Init] Initializing ACPI events\n"));
192
193                 status = acpi_ev_initialize_events();
194                 if (ACPI_FAILURE(status)) {
195                         return_ACPI_STATUS(status);
196                 }
197         }
198
199         /*
200          * Install the SCI handler and Global Lock handler. This completes the
201          * hardware initialization.
202          */
203         if (!(flags & ACPI_NO_HANDLER_INIT)) {
204                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
205                                   "[Init] Installing SCI/GL handlers\n"));
206
207                 status = acpi_ev_install_xrupt_handlers();
208                 if (ACPI_FAILURE(status)) {
209                         return_ACPI_STATUS(status);
210                 }
211         }
212
213         return_ACPI_STATUS(status);
214 }
215
216 ACPI_EXPORT_SYMBOL(acpi_enable_subsystem)
217
218 /*******************************************************************************
219  *
220  * FUNCTION:    acpi_initialize_objects
221  *
222  * PARAMETERS:  Flags           - Init/enable Options
223  *
224  * RETURN:      Status
225  *
226  * DESCRIPTION: Completes namespace initialization by initializing device
227  *              objects and executing AML code for Regions, buffers, etc.
228  *
229  ******************************************************************************/
230 acpi_status acpi_initialize_objects(u32 flags)
231 {
232         acpi_status status = AE_OK;
233
234         ACPI_FUNCTION_TRACE(acpi_initialize_objects);
235
236         /*
237          * Run all _REG methods
238          *
239          * Note: Any objects accessed by the _REG methods will be automatically
240          * initialized, even if they contain executable AML (see the call to
241          * acpi_ns_initialize_objects below).
242          */
243         if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
244                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
245                                   "[Init] Executing _REG OpRegion methods\n"));
246
247                 status = acpi_ev_initialize_op_regions();
248                 if (ACPI_FAILURE(status)) {
249                         return_ACPI_STATUS(status);
250                 }
251         }
252
253         /*
254          * Execute any module-level code that was detected during the table load
255          * phase. Although illegal since ACPI 2.0, there are many machines that
256          * contain this type of code. Each block of detected executable AML code
257          * outside of any control method is wrapped with a temporary control
258          * method object and placed on a global list. The methods on this list
259          * are executed below.
260          */
261         acpi_ns_exec_module_code_list();
262
263         /*
264          * Initialize the objects that remain uninitialized. This runs the
265          * executable AML that may be part of the declaration of these objects:
266          * operation_regions, buffer_fields, Buffers, and Packages.
267          */
268         if (!(flags & ACPI_NO_OBJECT_INIT)) {
269                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
270                                   "[Init] Completing Initialization of ACPI Objects\n"));
271
272                 status = acpi_ns_initialize_objects();
273                 if (ACPI_FAILURE(status)) {
274                         return_ACPI_STATUS(status);
275                 }
276         }
277
278         /*
279          * Initialize all device objects in the namespace. This runs the device
280          * _STA and _INI methods.
281          */
282         if (!(flags & ACPI_NO_DEVICE_INIT)) {
283                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
284                                   "[Init] Initializing ACPI Devices\n"));
285
286                 status = acpi_ns_initialize_devices();
287                 if (ACPI_FAILURE(status)) {
288                         return_ACPI_STATUS(status);
289                 }
290         }
291
292         /*
293          * Complete the GPE initialization for the GPE blocks defined in the FADT
294          * (GPE block 0 and 1).
295          *
296          * NOTE: Currently, there seems to be no need to run the _REG methods
297          * before enabling the GPEs.
298          */
299         if (!(flags & ACPI_NO_EVENT_INIT)) {
300                 status = acpi_ev_install_fadt_gpes();
301                 if (ACPI_FAILURE(status))
302                         return (status);
303         }
304
305         /*
306          * Empty the caches (delete the cached objects) on the assumption that
307          * the table load filled them up more than they will be at runtime --
308          * thus wasting non-paged memory.
309          */
310         status = acpi_purge_cached_objects();
311
312         acpi_gbl_startup_flags |= ACPI_INITIALIZED_OK;
313         return_ACPI_STATUS(status);
314 }
315
316 ACPI_EXPORT_SYMBOL(acpi_initialize_objects)
317
318 #endif
319 /*******************************************************************************
320  *
321  * FUNCTION:    acpi_terminate
322  *
323  * PARAMETERS:  None
324  *
325  * RETURN:      Status
326  *
327  * DESCRIPTION: Shutdown the ACPICA subsystem and release all resources.
328  *
329  ******************************************************************************/
330 acpi_status acpi_terminate(void)
331 {
332         acpi_status status;
333
334         ACPI_FUNCTION_TRACE(acpi_terminate);
335
336         /* Just exit if subsystem is already shutdown */
337
338         if (acpi_gbl_shutdown) {
339                 ACPI_ERROR((AE_INFO, "ACPI Subsystem is already terminated"));
340                 return_ACPI_STATUS(AE_OK);
341         }
342
343         /* Subsystem appears active, go ahead and shut it down */
344
345         acpi_gbl_shutdown = TRUE;
346         acpi_gbl_startup_flags = 0;
347         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Shutting down ACPI Subsystem\n"));
348
349         /* Terminate the AML Debugger if present */
350
351         ACPI_DEBUGGER_EXEC(acpi_gbl_db_terminate_threads = TRUE);
352
353         /* Shutdown and free all resources */
354
355         acpi_ut_subsystem_shutdown();
356
357         /* Free the mutex objects */
358
359         acpi_ut_mutex_terminate();
360
361 #ifdef ACPI_DEBUGGER
362
363         /* Shut down the debugger */
364
365         acpi_db_terminate();
366 #endif
367
368         /* Now we can shutdown the OS-dependent layer */
369
370         status = acpi_os_terminate();
371         return_ACPI_STATUS(status);
372 }
373
374 ACPI_EXPORT_SYMBOL(acpi_terminate)
375
376 #ifndef ACPI_ASL_COMPILER
377 #ifdef ACPI_FUTURE_USAGE
378 /*******************************************************************************
379  *
380  * FUNCTION:    acpi_subsystem_status
381  *
382  * PARAMETERS:  None
383  *
384  * RETURN:      Status of the ACPI subsystem
385  *
386  * DESCRIPTION: Other drivers that use the ACPI subsystem should call this
387  *              before making any other calls, to ensure the subsystem
388  *              initialized successfully.
389  *
390  ******************************************************************************/
391 acpi_status acpi_subsystem_status(void)
392 {
393
394         if (acpi_gbl_startup_flags & ACPI_INITIALIZED_OK) {
395                 return (AE_OK);
396         } else {
397                 return (AE_ERROR);
398         }
399 }
400
401 ACPI_EXPORT_SYMBOL(acpi_subsystem_status)
402
403 /*******************************************************************************
404  *
405  * FUNCTION:    acpi_get_system_info
406  *
407  * PARAMETERS:  out_buffer      - A buffer to receive the resources for the
408  *                                device
409  *
410  * RETURN:      Status          - the status of the call
411  *
412  * DESCRIPTION: This function is called to get information about the current
413  *              state of the ACPI subsystem.  It will return system information
414  *              in the out_buffer.
415  *
416  *              If the function fails an appropriate status will be returned
417  *              and the value of out_buffer is undefined.
418  *
419  ******************************************************************************/
420 acpi_status acpi_get_system_info(struct acpi_buffer * out_buffer)
421 {
422         struct acpi_system_info *info_ptr;
423         acpi_status status;
424
425         ACPI_FUNCTION_TRACE(acpi_get_system_info);
426
427         /* Parameter validation */
428
429         status = acpi_ut_validate_buffer(out_buffer);
430         if (ACPI_FAILURE(status)) {
431                 return_ACPI_STATUS(status);
432         }
433
434         /* Validate/Allocate/Clear caller buffer */
435
436         status =
437             acpi_ut_initialize_buffer(out_buffer,
438                                       sizeof(struct acpi_system_info));
439         if (ACPI_FAILURE(status)) {
440                 return_ACPI_STATUS(status);
441         }
442
443         /*
444          * Populate the return buffer
445          */
446         info_ptr = (struct acpi_system_info *)out_buffer->pointer;
447
448         info_ptr->acpi_ca_version = ACPI_CA_VERSION;
449
450         /* System flags (ACPI capabilities) */
451
452         info_ptr->flags = ACPI_SYS_MODE_ACPI;
453
454         /* Timer resolution - 24 or 32 bits  */
455
456         if (acpi_gbl_FADT.flags & ACPI_FADT_32BIT_TIMER) {
457                 info_ptr->timer_resolution = 24;
458         } else {
459                 info_ptr->timer_resolution = 32;
460         }
461
462         /* Clear the reserved fields */
463
464         info_ptr->reserved1 = 0;
465         info_ptr->reserved2 = 0;
466
467         /* Current debug levels */
468
469         info_ptr->debug_layer = acpi_dbg_layer;
470         info_ptr->debug_level = acpi_dbg_level;
471
472         return_ACPI_STATUS(AE_OK);
473 }
474
475 ACPI_EXPORT_SYMBOL(acpi_get_system_info)
476
477 /*****************************************************************************
478  *
479  * FUNCTION:    acpi_install_initialization_handler
480  *
481  * PARAMETERS:  Handler             - Callback procedure
482  *              Function            - Not (currently) used, see below
483  *
484  * RETURN:      Status
485  *
486  * DESCRIPTION: Install an initialization handler
487  *
488  * TBD: When a second function is added, must save the Function also.
489  *
490  ****************************************************************************/
491 acpi_status
492 acpi_install_initialization_handler(acpi_init_handler handler, u32 function)
493 {
494
495         if (!handler) {
496                 return (AE_BAD_PARAMETER);
497         }
498
499         if (acpi_gbl_init_handler) {
500                 return (AE_ALREADY_EXISTS);
501         }
502
503         acpi_gbl_init_handler = handler;
504         return AE_OK;
505 }
506
507 ACPI_EXPORT_SYMBOL(acpi_install_initialization_handler)
508 #endif                          /*  ACPI_FUTURE_USAGE  */
509 /*****************************************************************************
510  *
511  * FUNCTION:    acpi_purge_cached_objects
512  *
513  * PARAMETERS:  None
514  *
515  * RETURN:      Status
516  *
517  * DESCRIPTION: Empty all caches (delete the cached objects)
518  *
519  ****************************************************************************/
520 acpi_status acpi_purge_cached_objects(void)
521 {
522         ACPI_FUNCTION_TRACE(acpi_purge_cached_objects);
523
524         (void)acpi_os_purge_cache(acpi_gbl_state_cache);
525         (void)acpi_os_purge_cache(acpi_gbl_operand_cache);
526         (void)acpi_os_purge_cache(acpi_gbl_ps_node_cache);
527         (void)acpi_os_purge_cache(acpi_gbl_ps_node_ext_cache);
528         return_ACPI_STATUS(AE_OK);
529 }
530
531 ACPI_EXPORT_SYMBOL(acpi_purge_cached_objects)
532 #endif