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1da177e4 LT |
1 | /****************************************************************************** |
2 | * | |
3 | * Module Name: evevent - Fixed Event handling and dispatch | |
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 <acpi/acpi.h> | |
45 | #include <acpi/acevents.h> | |
46 | ||
47 | #define _COMPONENT ACPI_EVENTS | |
48 | ACPI_MODULE_NAME ("evevent") | |
49 | ||
50 | ||
51 | /******************************************************************************* | |
52 | * | |
53 | * FUNCTION: acpi_ev_initialize_events | |
54 | * | |
55 | * PARAMETERS: None | |
56 | * | |
57 | * RETURN: Status | |
58 | * | |
59 | * DESCRIPTION: Initialize global data structures for events. | |
60 | * | |
61 | ******************************************************************************/ | |
62 | ||
63 | acpi_status | |
64 | acpi_ev_initialize_events ( | |
65 | void) | |
66 | { | |
67 | acpi_status status; | |
68 | ||
69 | ||
70 | ACPI_FUNCTION_TRACE ("ev_initialize_events"); | |
71 | ||
72 | ||
73 | /* Make sure we have ACPI tables */ | |
74 | ||
75 | if (!acpi_gbl_DSDT) { | |
76 | ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "No ACPI tables present!\n")); | |
77 | return_ACPI_STATUS (AE_NO_ACPI_TABLES); | |
78 | } | |
79 | ||
80 | /* | |
81 | * Initialize the Fixed and General Purpose Events. This is | |
82 | * done prior to enabling SCIs to prevent interrupts from | |
83 | * occurring before handers are installed. | |
84 | */ | |
85 | status = acpi_ev_fixed_event_initialize (); | |
86 | if (ACPI_FAILURE (status)) { | |
87 | ACPI_REPORT_ERROR (( | |
88 | "Unable to initialize fixed events, %s\n", | |
89 | acpi_format_exception (status))); | |
90 | return_ACPI_STATUS (status); | |
91 | } | |
92 | ||
93 | status = acpi_ev_gpe_initialize (); | |
94 | if (ACPI_FAILURE (status)) { | |
95 | ACPI_REPORT_ERROR (( | |
96 | "Unable to initialize general purpose events, %s\n", | |
97 | acpi_format_exception (status))); | |
98 | return_ACPI_STATUS (status); | |
99 | } | |
100 | ||
101 | return_ACPI_STATUS (status); | |
102 | } | |
103 | ||
104 | ||
105 | /******************************************************************************* | |
106 | * | |
107 | * FUNCTION: acpi_ev_install_xrupt_handlers | |
108 | * | |
109 | * PARAMETERS: None | |
110 | * | |
111 | * RETURN: Status | |
112 | * | |
113 | * DESCRIPTION: Install interrupt handlers for the SCI and Global Lock | |
114 | * | |
115 | ******************************************************************************/ | |
116 | ||
117 | acpi_status | |
118 | acpi_ev_install_xrupt_handlers ( | |
119 | void) | |
120 | { | |
121 | acpi_status status; | |
122 | ||
123 | ||
124 | ACPI_FUNCTION_TRACE ("ev_install_xrupt_handlers"); | |
125 | ||
126 | ||
127 | /* Install the SCI handler */ | |
128 | ||
129 | status = acpi_ev_install_sci_handler (); | |
130 | if (ACPI_FAILURE (status)) { | |
131 | ACPI_REPORT_ERROR (( | |
132 | "Unable to install System Control Interrupt Handler, %s\n", | |
133 | acpi_format_exception (status))); | |
134 | return_ACPI_STATUS (status); | |
135 | } | |
136 | ||
137 | /* Install the handler for the Global Lock */ | |
138 | ||
139 | status = acpi_ev_init_global_lock_handler (); | |
140 | if (ACPI_FAILURE (status)) { | |
141 | ACPI_REPORT_ERROR (( | |
142 | "Unable to initialize Global Lock handler, %s\n", | |
143 | acpi_format_exception (status))); | |
144 | return_ACPI_STATUS (status); | |
145 | } | |
146 | ||
147 | acpi_gbl_events_initialized = TRUE; | |
148 | return_ACPI_STATUS (status); | |
149 | } | |
150 | ||
151 | ||
152 | /******************************************************************************* | |
153 | * | |
154 | * FUNCTION: acpi_ev_fixed_event_initialize | |
155 | * | |
156 | * PARAMETERS: None | |
157 | * | |
158 | * RETURN: Status | |
159 | * | |
160 | * DESCRIPTION: Install the fixed event handlers and enable the fixed events. | |
161 | * | |
162 | ******************************************************************************/ | |
163 | ||
164 | acpi_status | |
165 | acpi_ev_fixed_event_initialize ( | |
166 | void) | |
167 | { | |
168 | acpi_native_uint i; | |
169 | acpi_status status; | |
170 | ||
171 | ||
172 | /* | |
173 | * Initialize the structure that keeps track of fixed event handlers | |
174 | * and enable the fixed events. | |
175 | */ | |
176 | for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) { | |
177 | acpi_gbl_fixed_event_handlers[i].handler = NULL; | |
178 | acpi_gbl_fixed_event_handlers[i].context = NULL; | |
179 | ||
180 | /* Enable the fixed event */ | |
181 | ||
182 | if (acpi_gbl_fixed_event_info[i].enable_register_id != 0xFF) { | |
183 | status = acpi_set_register (acpi_gbl_fixed_event_info[i].enable_register_id, | |
184 | 0, ACPI_MTX_LOCK); | |
185 | if (ACPI_FAILURE (status)) { | |
186 | return (status); | |
187 | } | |
188 | } | |
189 | } | |
190 | ||
191 | return (AE_OK); | |
192 | } | |
193 | ||
194 | ||
195 | /******************************************************************************* | |
196 | * | |
197 | * FUNCTION: acpi_ev_fixed_event_detect | |
198 | * | |
199 | * PARAMETERS: None | |
200 | * | |
201 | * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED | |
202 | * | |
203 | * DESCRIPTION: Checks the PM status register for fixed events | |
204 | * | |
205 | ******************************************************************************/ | |
206 | ||
207 | u32 | |
208 | acpi_ev_fixed_event_detect ( | |
209 | void) | |
210 | { | |
211 | u32 int_status = ACPI_INTERRUPT_NOT_HANDLED; | |
212 | u32 fixed_status; | |
213 | u32 fixed_enable; | |
214 | acpi_native_uint i; | |
215 | ||
216 | ||
217 | ACPI_FUNCTION_NAME ("ev_fixed_event_detect"); | |
218 | ||
219 | ||
220 | /* | |
221 | * Read the fixed feature status and enable registers, as all the cases | |
222 | * depend on their values. Ignore errors here. | |
223 | */ | |
224 | (void) acpi_hw_register_read (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1_STATUS, &fixed_status); | |
225 | (void) acpi_hw_register_read (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1_ENABLE, &fixed_enable); | |
226 | ||
227 | ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS, | |
228 | "Fixed Event Block: Enable %08X Status %08X\n", | |
229 | fixed_enable, fixed_status)); | |
230 | ||
231 | /* | |
232 | * Check for all possible Fixed Events and dispatch those that are active | |
233 | */ | |
234 | for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) { | |
235 | /* Both the status and enable bits must be on for this event */ | |
236 | ||
237 | if ((fixed_status & acpi_gbl_fixed_event_info[i].status_bit_mask) && | |
238 | (fixed_enable & acpi_gbl_fixed_event_info[i].enable_bit_mask)) { | |
239 | /* Found an active (signalled) event */ | |
240 | ||
241 | int_status |= acpi_ev_fixed_event_dispatch ((u32) i); | |
242 | } | |
243 | } | |
244 | ||
245 | return (int_status); | |
246 | } | |
247 | ||
248 | ||
249 | /******************************************************************************* | |
250 | * | |
251 | * FUNCTION: acpi_ev_fixed_event_dispatch | |
252 | * | |
253 | * PARAMETERS: Event - Event type | |
254 | * | |
255 | * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED | |
256 | * | |
257 | * DESCRIPTION: Clears the status bit for the requested event, calls the | |
258 | * handler that previously registered for the event. | |
259 | * | |
260 | ******************************************************************************/ | |
261 | ||
262 | u32 | |
263 | acpi_ev_fixed_event_dispatch ( | |
264 | u32 event) | |
265 | { | |
266 | ||
267 | ||
268 | ACPI_FUNCTION_ENTRY (); | |
269 | ||
270 | ||
271 | /* Clear the status bit */ | |
272 | ||
273 | (void) acpi_set_register (acpi_gbl_fixed_event_info[event].status_register_id, | |
274 | 1, ACPI_MTX_DO_NOT_LOCK); | |
275 | ||
276 | /* | |
277 | * Make sure we've got a handler. If not, report an error. | |
278 | * The event is disabled to prevent further interrupts. | |
279 | */ | |
280 | if (NULL == acpi_gbl_fixed_event_handlers[event].handler) { | |
281 | (void) acpi_set_register (acpi_gbl_fixed_event_info[event].enable_register_id, | |
282 | 0, ACPI_MTX_DO_NOT_LOCK); | |
283 | ||
284 | ACPI_REPORT_ERROR ( | |
285 | ("No installed handler for fixed event [%08X]\n", | |
286 | event)); | |
287 | ||
288 | return (ACPI_INTERRUPT_NOT_HANDLED); | |
289 | } | |
290 | ||
291 | /* Invoke the Fixed Event handler */ | |
292 | ||
293 | return ((acpi_gbl_fixed_event_handlers[event].handler)( | |
294 | acpi_gbl_fixed_event_handlers[event].context)); | |
295 | } | |
296 | ||
297 |