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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 | |
4be44fcd | 48 | ACPI_MODULE_NAME("evevent") |
1da177e4 | 49 | |
44f6c012 | 50 | /* Local prototypes */ |
4be44fcd | 51 | static acpi_status acpi_ev_fixed_event_initialize(void); |
44f6c012 | 52 | |
4be44fcd | 53 | static u32 acpi_ev_fixed_event_dispatch(u32 event); |
1da177e4 LT |
54 | |
55 | /******************************************************************************* | |
56 | * | |
57 | * FUNCTION: acpi_ev_initialize_events | |
58 | * | |
59 | * PARAMETERS: None | |
60 | * | |
61 | * RETURN: Status | |
62 | * | |
44f6c012 | 63 | * DESCRIPTION: Initialize global data structures for ACPI events (Fixed, GPE) |
1da177e4 LT |
64 | * |
65 | ******************************************************************************/ | |
66 | ||
4be44fcd | 67 | acpi_status acpi_ev_initialize_events(void) |
1da177e4 | 68 | { |
4be44fcd | 69 | acpi_status status; |
1da177e4 | 70 | |
4be44fcd | 71 | ACPI_FUNCTION_TRACE("ev_initialize_events"); |
1da177e4 LT |
72 | |
73 | /* Make sure we have ACPI tables */ | |
74 | ||
75 | if (!acpi_gbl_DSDT) { | |
4be44fcd LB |
76 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, "No ACPI tables present!\n")); |
77 | return_ACPI_STATUS(AE_NO_ACPI_TABLES); | |
1da177e4 LT |
78 | } |
79 | ||
80 | /* | |
44f6c012 RM |
81 | * Initialize the Fixed and General Purpose Events. This is done prior to |
82 | * enabling SCIs to prevent interrupts from occurring before the handlers are | |
83 | * installed. | |
1da177e4 | 84 | */ |
4be44fcd LB |
85 | status = acpi_ev_fixed_event_initialize(); |
86 | if (ACPI_FAILURE(status)) { | |
87 | ACPI_REPORT_ERROR(("Unable to initialize fixed events, %s\n", | |
88 | acpi_format_exception(status))); | |
89 | return_ACPI_STATUS(status); | |
1da177e4 LT |
90 | } |
91 | ||
4be44fcd LB |
92 | status = acpi_ev_gpe_initialize(); |
93 | if (ACPI_FAILURE(status)) { | |
94 | ACPI_REPORT_ERROR(("Unable to initialize general purpose events, %s\n", acpi_format_exception(status))); | |
95 | return_ACPI_STATUS(status); | |
1da177e4 LT |
96 | } |
97 | ||
4be44fcd | 98 | return_ACPI_STATUS(status); |
1da177e4 LT |
99 | } |
100 | ||
1da177e4 LT |
101 | /******************************************************************************* |
102 | * | |
103 | * FUNCTION: acpi_ev_install_xrupt_handlers | |
104 | * | |
105 | * PARAMETERS: None | |
106 | * | |
107 | * RETURN: Status | |
108 | * | |
109 | * DESCRIPTION: Install interrupt handlers for the SCI and Global Lock | |
110 | * | |
111 | ******************************************************************************/ | |
112 | ||
4be44fcd | 113 | acpi_status acpi_ev_install_xrupt_handlers(void) |
1da177e4 | 114 | { |
4be44fcd | 115 | acpi_status status; |
1da177e4 | 116 | |
4be44fcd | 117 | ACPI_FUNCTION_TRACE("ev_install_xrupt_handlers"); |
1da177e4 LT |
118 | |
119 | /* Install the SCI handler */ | |
120 | ||
4be44fcd LB |
121 | status = acpi_ev_install_sci_handler(); |
122 | if (ACPI_FAILURE(status)) { | |
123 | ACPI_REPORT_ERROR(("Unable to install System Control Interrupt Handler, %s\n", acpi_format_exception(status))); | |
124 | return_ACPI_STATUS(status); | |
1da177e4 LT |
125 | } |
126 | ||
127 | /* Install the handler for the Global Lock */ | |
128 | ||
4be44fcd LB |
129 | status = acpi_ev_init_global_lock_handler(); |
130 | if (ACPI_FAILURE(status)) { | |
131 | ACPI_REPORT_ERROR(("Unable to initialize Global Lock handler, %s\n", acpi_format_exception(status))); | |
132 | return_ACPI_STATUS(status); | |
1da177e4 LT |
133 | } |
134 | ||
135 | acpi_gbl_events_initialized = TRUE; | |
4be44fcd | 136 | return_ACPI_STATUS(status); |
1da177e4 LT |
137 | } |
138 | ||
1da177e4 LT |
139 | /******************************************************************************* |
140 | * | |
141 | * FUNCTION: acpi_ev_fixed_event_initialize | |
142 | * | |
143 | * PARAMETERS: None | |
144 | * | |
145 | * RETURN: Status | |
146 | * | |
147 | * DESCRIPTION: Install the fixed event handlers and enable the fixed events. | |
148 | * | |
149 | ******************************************************************************/ | |
150 | ||
4be44fcd | 151 | static acpi_status acpi_ev_fixed_event_initialize(void) |
1da177e4 | 152 | { |
4be44fcd LB |
153 | acpi_native_uint i; |
154 | acpi_status status; | |
1da177e4 LT |
155 | |
156 | /* | |
157 | * Initialize the structure that keeps track of fixed event handlers | |
158 | * and enable the fixed events. | |
159 | */ | |
160 | for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) { | |
161 | acpi_gbl_fixed_event_handlers[i].handler = NULL; | |
162 | acpi_gbl_fixed_event_handlers[i].context = NULL; | |
163 | ||
164 | /* Enable the fixed event */ | |
165 | ||
166 | if (acpi_gbl_fixed_event_info[i].enable_register_id != 0xFF) { | |
4be44fcd LB |
167 | status = |
168 | acpi_set_register(acpi_gbl_fixed_event_info[i]. | |
169 | enable_register_id, 0, | |
170 | ACPI_MTX_LOCK); | |
171 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
172 | return (status); |
173 | } | |
174 | } | |
175 | } | |
176 | ||
177 | return (AE_OK); | |
178 | } | |
179 | ||
1da177e4 LT |
180 | /******************************************************************************* |
181 | * | |
182 | * FUNCTION: acpi_ev_fixed_event_detect | |
183 | * | |
184 | * PARAMETERS: None | |
185 | * | |
186 | * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED | |
187 | * | |
44f6c012 | 188 | * DESCRIPTION: Checks the PM status register for active fixed events |
1da177e4 LT |
189 | * |
190 | ******************************************************************************/ | |
191 | ||
4be44fcd | 192 | u32 acpi_ev_fixed_event_detect(void) |
1da177e4 | 193 | { |
4be44fcd LB |
194 | u32 int_status = ACPI_INTERRUPT_NOT_HANDLED; |
195 | u32 fixed_status; | |
196 | u32 fixed_enable; | |
197 | acpi_native_uint i; | |
1da177e4 | 198 | |
4be44fcd | 199 | ACPI_FUNCTION_NAME("ev_fixed_event_detect"); |
1da177e4 LT |
200 | |
201 | /* | |
202 | * Read the fixed feature status and enable registers, as all the cases | |
203 | * depend on their values. Ignore errors here. | |
204 | */ | |
4be44fcd LB |
205 | (void)acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK, |
206 | ACPI_REGISTER_PM1_STATUS, &fixed_status); | |
207 | (void)acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK, | |
208 | ACPI_REGISTER_PM1_ENABLE, &fixed_enable); | |
1da177e4 | 209 | |
4be44fcd LB |
210 | ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS, |
211 | "Fixed Event Block: Enable %08X Status %08X\n", | |
212 | fixed_enable, fixed_status)); | |
1da177e4 LT |
213 | |
214 | /* | |
215 | * Check for all possible Fixed Events and dispatch those that are active | |
216 | */ | |
217 | for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) { | |
218 | /* Both the status and enable bits must be on for this event */ | |
219 | ||
4be44fcd LB |
220 | if ((fixed_status & acpi_gbl_fixed_event_info[i]. |
221 | status_bit_mask) | |
222 | && (fixed_enable & acpi_gbl_fixed_event_info[i]. | |
223 | enable_bit_mask)) { | |
1da177e4 LT |
224 | /* Found an active (signalled) event */ |
225 | ||
4be44fcd | 226 | int_status |= acpi_ev_fixed_event_dispatch((u32) i); |
1da177e4 LT |
227 | } |
228 | } | |
229 | ||
230 | return (int_status); | |
231 | } | |
232 | ||
1da177e4 LT |
233 | /******************************************************************************* |
234 | * | |
235 | * FUNCTION: acpi_ev_fixed_event_dispatch | |
236 | * | |
237 | * PARAMETERS: Event - Event type | |
238 | * | |
239 | * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED | |
240 | * | |
241 | * DESCRIPTION: Clears the status bit for the requested event, calls the | |
242 | * handler that previously registered for the event. | |
243 | * | |
244 | ******************************************************************************/ | |
245 | ||
4be44fcd | 246 | static u32 acpi_ev_fixed_event_dispatch(u32 event) |
1da177e4 LT |
247 | { |
248 | ||
4be44fcd | 249 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
250 | |
251 | /* Clear the status bit */ | |
252 | ||
4be44fcd LB |
253 | (void)acpi_set_register(acpi_gbl_fixed_event_info[event]. |
254 | status_register_id, 1, ACPI_MTX_DO_NOT_LOCK); | |
1da177e4 LT |
255 | |
256 | /* | |
257 | * Make sure we've got a handler. If not, report an error. | |
258 | * The event is disabled to prevent further interrupts. | |
259 | */ | |
260 | if (NULL == acpi_gbl_fixed_event_handlers[event].handler) { | |
4be44fcd LB |
261 | (void)acpi_set_register(acpi_gbl_fixed_event_info[event]. |
262 | enable_register_id, 0, | |
263 | ACPI_MTX_DO_NOT_LOCK); | |
1da177e4 | 264 | |
4be44fcd | 265 | ACPI_REPORT_ERROR(("No installed handler for fixed event [%08X]\n", event)); |
1da177e4 LT |
266 | |
267 | return (ACPI_INTERRUPT_NOT_HANDLED); | |
268 | } | |
269 | ||
270 | /* Invoke the Fixed Event handler */ | |
271 | ||
4be44fcd LB |
272 | return ((acpi_gbl_fixed_event_handlers[event]. |
273 | handler) (acpi_gbl_fixed_event_handlers[event].context)); | |
1da177e4 | 274 | } |