1 /******************************************************************************
2 *
3 * Module Name: evevent - Fixed Event handling and dispatch
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2007, 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 /* Local prototypes */
51 static acpi_status acpi_ev_fixed_event_initialize(void);
52
53 static u32 acpi_ev_fixed_event_dispatch(u32 event);
54
55 /*******************************************************************************
56 *
57 * FUNCTION: acpi_ev_initialize_events
58 *
59 * PARAMETERS: None
60 *
61 * RETURN: Status
62 *
63 * DESCRIPTION: Initialize global data structures for ACPI events (Fixed, GPE)
64 *
65 ******************************************************************************/
66
67 acpi_status acpi_ev_initialize_events(void)
68 {
69 acpi_status status;
70
71 ACPI_FUNCTION_TRACE(ev_initialize_events);
72
73 /*
74 * Initialize the Fixed and General Purpose Events. This is done prior to
75 * enabling SCIs to prevent interrupts from occurring before the handlers are
76 * installed.
77 */
78 status = acpi_ev_fixed_event_initialize();
79 if (ACPI_FAILURE(status)) {
80 ACPI_EXCEPTION((AE_INFO, status,
81 "Unable to initialize fixed events"));
82 return_ACPI_STATUS(status);
83 }
84
85 status = acpi_ev_gpe_initialize();
86 if (ACPI_FAILURE(status)) {
87 ACPI_EXCEPTION((AE_INFO, status,
88 "Unable to initialize general purpose events"));
89 return_ACPI_STATUS(status);
90 }
91
92 return_ACPI_STATUS(status);
93 }
94
95 /*******************************************************************************
96 *
97 * FUNCTION: acpi_ev_install_fadt_gpes
98 *
99 * PARAMETERS: None
100 *
101 * RETURN: Status
102 *
103 * DESCRIPTION: Completes initialization of the FADT-defined GPE blocks
104 * (0 and 1). This causes the _PRW methods to be run, so the HW
105 * must be fully initialized at this point, including global lock
106 * support.
107 *
108 ******************************************************************************/
109
110 acpi_status acpi_ev_install_fadt_gpes(void)
111 {
112 acpi_status status;
113
114 ACPI_FUNCTION_TRACE(ev_install_fadt_gpes);
115
116 /* Namespace must be locked */
117
118 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
119 if (ACPI_FAILURE(status)) {
120 return (status);
121 }
122
123 /* FADT GPE Block 0 */
124
125 (void)acpi_ev_initialize_gpe_block(acpi_gbl_fadt_gpe_device,
126 acpi_gbl_gpe_fadt_blocks[0]);
127
128 /* FADT GPE Block 1 */
129
130 (void)acpi_ev_initialize_gpe_block(acpi_gbl_fadt_gpe_device,
131 acpi_gbl_gpe_fadt_blocks[1]);
132
133 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
134 return_ACPI_STATUS(AE_OK);
135 }
136
137 /*******************************************************************************
138 *
139 * FUNCTION: acpi_ev_install_xrupt_handlers
140 *
141 * PARAMETERS: None
142 *
143 * RETURN: Status
144 *
145 * DESCRIPTION: Install interrupt handlers for the SCI and Global Lock
146 *
147 ******************************************************************************/
148
149 acpi_status acpi_ev_install_xrupt_handlers(void)
150 {
151 acpi_status status;
152
153 ACPI_FUNCTION_TRACE(ev_install_xrupt_handlers);
154
155 /* Install the SCI handler */
156
157 status = acpi_ev_install_sci_handler();
158 if (ACPI_FAILURE(status)) {
159 ACPI_EXCEPTION((AE_INFO, status,
160 "Unable to install System Control Interrupt handler"));
161 return_ACPI_STATUS(status);
162 }
163
164 /* Install the handler for the Global Lock */
165
166 status = acpi_ev_init_global_lock_handler();
167 if (ACPI_FAILURE(status)) {
168 ACPI_EXCEPTION((AE_INFO, status,
169 "Unable to initialize Global Lock handler"));
170 return_ACPI_STATUS(status);
171 }
172
173 acpi_gbl_events_initialized = TRUE;
174 return_ACPI_STATUS(status);
175 }
176
177 /*******************************************************************************
178 *
179 * FUNCTION: acpi_ev_fixed_event_initialize
180 *
181 * PARAMETERS: None
182 *
183 * RETURN: Status
184 *
185 * DESCRIPTION: Install the fixed event handlers and enable the fixed events.
186 *
187 ******************************************************************************/
188
189 static acpi_status acpi_ev_fixed_event_initialize(void)
190 {
191 acpi_native_uint i;
192 acpi_status status;
193
194 /*
195 * Initialize the structure that keeps track of fixed event handlers
196 * and enable the fixed events.
197 */
198 for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
199 acpi_gbl_fixed_event_handlers[i].handler = NULL;
200 acpi_gbl_fixed_event_handlers[i].context = NULL;
201
202 /* Enable the fixed event */
203
204 if (acpi_gbl_fixed_event_info[i].enable_register_id != 0xFF) {
205 status =
206 acpi_set_register(acpi_gbl_fixed_event_info[i].
207 enable_register_id, 0);
208 if (ACPI_FAILURE(status)) {
209 return (status);
210 }
211 }
212 }
213
214 return (AE_OK);
215 }
216
217 /*******************************************************************************
218 *
219 * FUNCTION: acpi_ev_fixed_event_detect
220 *
221 * PARAMETERS: None
222 *
223 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
224 *
225 * DESCRIPTION: Checks the PM status register for active fixed events
226 *
227 ******************************************************************************/
228
229 u32 acpi_ev_fixed_event_detect(void)
230 {
231 u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
232 u32 fixed_status;
233 u32 fixed_enable;
234 acpi_native_uint i;
235
236 ACPI_FUNCTION_NAME(ev_fixed_event_detect);
237
238 /*
239 * Read the fixed feature status and enable registers, as all the cases
240 * depend on their values. Ignore errors here.
241 */
242 (void)acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS, &fixed_status);
243 (void)acpi_hw_register_read(ACPI_REGISTER_PM1_ENABLE, &fixed_enable);
244
245 ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
246 "Fixed Event Block: Enable %08X Status %08X\n",
247 fixed_enable, fixed_status));
248
249 /*
250 * Check for all possible Fixed Events and dispatch those that are active
251 */
252 for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
253
254 /* Both the status and enable bits must be on for this event */
255
256 if ((fixed_status & acpi_gbl_fixed_event_info[i].
257 status_bit_mask)
258 && (fixed_enable & acpi_gbl_fixed_event_info[i].
259 enable_bit_mask)) {
260
261 /* Found an active (signalled) event */
262 acpi_os_fixed_event_count(i);
263 int_status |= acpi_ev_fixed_event_dispatch((u32) i);
264 }
265 }
266
267 return (int_status);
268 }
269
270 /*******************************************************************************
271 *
272 * FUNCTION: acpi_ev_fixed_event_dispatch
273 *
274 * PARAMETERS: Event - Event type
275 *
276 * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
277 *
278 * DESCRIPTION: Clears the status bit for the requested event, calls the
279 * handler that previously registered for the event.
280 *
281 ******************************************************************************/
282
283 static u32 acpi_ev_fixed_event_dispatch(u32 event)
284 {
285
286 ACPI_FUNCTION_ENTRY();
287
288 /* Clear the status bit */
289
290 (void)acpi_set_register(acpi_gbl_fixed_event_info[event].
291 status_register_id, 1);
292
293 /*
294 * Make sure we've got a handler. If not, report an error.
295 * The event is disabled to prevent further interrupts.
296 */
297 if (NULL == acpi_gbl_fixed_event_handlers[event].handler) {
298 (void)acpi_set_register(acpi_gbl_fixed_event_info[event].
299 enable_register_id, 0);
300
301 ACPI_ERROR((AE_INFO,
302 "No installed handler for fixed event [%08X]",
303 event));
304
305 return (ACPI_INTERRUPT_NOT_HANDLED);
306 }
307
308 /* Invoke the Fixed Event handler */
309
310 return ((acpi_gbl_fixed_event_handlers[event].
311 handler) (acpi_gbl_fixed_event_handlers[event].context));
312 }
313
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