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Merge tag 'for-linus-20130301' of git://git.infradead.org/linux-mtd
[~andy/linux] / drivers / acpi / acpica / utxfinit.c
1 /******************************************************************************
2  *
3  * Module Name: utxfinit - External interfaces for ACPICA initialization
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2013, 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
52 #define _COMPONENT          ACPI_UTILITIES
53 ACPI_MODULE_NAME("utxfinit")
54
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 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         /* Initialize the global OSI interfaces list with the static names */
114
115         status = acpi_ut_initialize_interfaces();
116         if (ACPI_FAILURE(status)) {
117                 ACPI_EXCEPTION((AE_INFO, status,
118                                 "During OSI interfaces initialization"));
119                 return_ACPI_STATUS(status);
120         }
121
122         /* If configured, initialize the AML debugger */
123
124         ACPI_DEBUGGER_EXEC(status = acpi_db_initialize());
125         return_ACPI_STATUS(status);
126 }
127 ACPI_EXPORT_SYMBOL(acpi_initialize_subsystem)
128
129 /*******************************************************************************
130  *
131  * FUNCTION:    acpi_enable_subsystem
132  *
133  * PARAMETERS:  flags               - Init/enable Options
134  *
135  * RETURN:      Status
136  *
137  * DESCRIPTION: Completes the subsystem initialization including hardware.
138  *              Puts system into ACPI mode if it isn't already.
139  *
140  ******************************************************************************/
141 acpi_status acpi_enable_subsystem(u32 flags)
142 {
143         acpi_status status = AE_OK;
144
145         ACPI_FUNCTION_TRACE(acpi_enable_subsystem);
146
147 #if (!ACPI_REDUCED_HARDWARE)
148
149         /* Enable ACPI mode */
150
151         if (!(flags & ACPI_NO_ACPI_ENABLE)) {
152                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
153                                   "[Init] Going into ACPI mode\n"));
154
155                 acpi_gbl_original_mode = acpi_hw_get_mode();
156
157                 status = acpi_enable();
158                 if (ACPI_FAILURE(status)) {
159                         ACPI_WARNING((AE_INFO, "AcpiEnable failed"));
160                         return_ACPI_STATUS(status);
161                 }
162         }
163
164         /*
165          * Obtain a permanent mapping for the FACS. This is required for the
166          * Global Lock and the Firmware Waking Vector
167          */
168         status = acpi_tb_initialize_facs();
169         if (ACPI_FAILURE(status)) {
170                 ACPI_WARNING((AE_INFO, "Could not map the FACS table"));
171                 return_ACPI_STATUS(status);
172         }
173 #endif                          /* !ACPI_REDUCED_HARDWARE */
174
175         /*
176          * Install the default op_region handlers. These are installed unless
177          * other handlers have already been installed via the
178          * install_address_space_handler interface.
179          */
180         if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
181                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
182                                   "[Init] Installing default address space handlers\n"));
183
184                 status = acpi_ev_install_region_handlers();
185                 if (ACPI_FAILURE(status)) {
186                         return_ACPI_STATUS(status);
187                 }
188         }
189 #if (!ACPI_REDUCED_HARDWARE)
190         /*
191          * Initialize ACPI Event handling (Fixed and General Purpose)
192          *
193          * Note1: We must have the hardware and events initialized before we can
194          * execute any control methods safely. Any control method can require
195          * ACPI hardware support, so the hardware must be fully initialized before
196          * any method execution!
197          *
198          * Note2: Fixed events are initialized and enabled here. GPEs are
199          * initialized, but cannot be enabled until after the hardware is
200          * completely initialized (SCI and global_lock activated) and the various
201          * initialization control methods are run (_REG, _STA, _INI) on the
202          * entire namespace.
203          */
204         if (!(flags & ACPI_NO_EVENT_INIT)) {
205                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
206                                   "[Init] Initializing ACPI events\n"));
207
208                 status = acpi_ev_initialize_events();
209                 if (ACPI_FAILURE(status)) {
210                         return_ACPI_STATUS(status);
211                 }
212         }
213
214         /*
215          * Install the SCI handler and Global Lock handler. This completes the
216          * hardware initialization.
217          */
218         if (!(flags & ACPI_NO_HANDLER_INIT)) {
219                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
220                                   "[Init] Installing SCI/GL handlers\n"));
221
222                 status = acpi_ev_install_xrupt_handlers();
223                 if (ACPI_FAILURE(status)) {
224                         return_ACPI_STATUS(status);
225                 }
226         }
227 #endif                          /* !ACPI_REDUCED_HARDWARE */
228
229         return_ACPI_STATUS(status);
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 ACPI_EXPORT_SYMBOL(acpi_initialize_objects)