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Linux kernel mirror (for testing)
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1
2/******************************************************************************
3 *
4 * Module Name: hwgpe - Low level GPE enable/disable/clear functions
5 *
6 *****************************************************************************/
7
8/*
9 * Copyright (C) 2000 - 2006, R. Byron Moore
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions, and the following disclaimer,
17 * without modification.
18 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
19 * substantially similar to the "NO WARRANTY" disclaimer below
20 * ("Disclaimer") and any redistribution must be conditioned upon
21 * including a substantially similar Disclaimer requirement for further
22 * binary redistribution.
23 * 3. Neither the names of the above-listed copyright holders nor the names
24 * of any contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
26 *
27 * Alternatively, this software may be distributed under the terms of the
28 * GNU General Public License ("GPL") version 2 as published by the Free
29 * Software Foundation.
30 *
31 * NO WARRANTY
32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
35 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
36 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
41 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
42 * POSSIBILITY OF SUCH DAMAGES.
43 */
44
45#include <acpi/acpi.h>
46#include <acpi/acevents.h>
47
48#define _COMPONENT ACPI_HARDWARE
49ACPI_MODULE_NAME("hwgpe")
50
51/* Local prototypes */
52static acpi_status
53acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
54 struct acpi_gpe_block_info *gpe_block);
55
56/******************************************************************************
57 *
58 * FUNCTION: acpi_hw_write_gpe_enable_reg
59 *
60 * PARAMETERS: gpe_event_info - Info block for the GPE to be enabled
61 *
62 * RETURN: Status
63 *
64 * DESCRIPTION: Write a GPE enable register. Note: The bit for this GPE must
65 * already be cleared or set in the parent register
66 * enable_for_run mask.
67 *
68 ******************************************************************************/
69
70acpi_status
71acpi_hw_write_gpe_enable_reg(struct acpi_gpe_event_info *gpe_event_info)
72{
73 struct acpi_gpe_register_info *gpe_register_info;
74 acpi_status status;
75
76 ACPI_FUNCTION_ENTRY();
77
78 /* Get the info block for the entire GPE register */
79
80 gpe_register_info = gpe_event_info->register_info;
81 if (!gpe_register_info) {
82 return (AE_NOT_EXIST);
83 }
84
85 /* Write the entire GPE (runtime) enable register */
86
87 status = acpi_hw_low_level_write(8, gpe_register_info->enable_for_run,
88 &gpe_register_info->enable_address);
89
90 return (status);
91}
92
93/******************************************************************************
94 *
95 * FUNCTION: acpi_hw_clear_gpe
96 *
97 * PARAMETERS: gpe_event_info - Info block for the GPE to be cleared
98 *
99 * RETURN: Status
100 *
101 * DESCRIPTION: Clear the status bit for a single GPE.
102 *
103 ******************************************************************************/
104
105acpi_status acpi_hw_clear_gpe(struct acpi_gpe_event_info * gpe_event_info)
106{
107 acpi_status status;
108
109 ACPI_FUNCTION_ENTRY();
110
111 /*
112 * Write a one to the appropriate bit in the status register to
113 * clear this GPE.
114 */
115 status = acpi_hw_low_level_write(8, gpe_event_info->register_bit,
116 &gpe_event_info->register_info->
117 status_address);
118
119 return (status);
120}
121
122/******************************************************************************
123 *
124 * FUNCTION: acpi_hw_get_gpe_status
125 *
126 * PARAMETERS: gpe_event_info - Info block for the GPE to queried
127 * event_status - Where the GPE status is returned
128 *
129 * RETURN: Status
130 *
131 * DESCRIPTION: Return the status of a single GPE.
132 *
133 ******************************************************************************/
134
135#ifdef ACPI_FUTURE_USAGE
136acpi_status
137acpi_hw_get_gpe_status(struct acpi_gpe_event_info * gpe_event_info,
138 acpi_event_status * event_status)
139{
140 u32 in_byte;
141 u8 register_bit;
142 struct acpi_gpe_register_info *gpe_register_info;
143 acpi_status status;
144 acpi_event_status local_event_status = 0;
145
146 ACPI_FUNCTION_ENTRY();
147
148 if (!event_status) {
149 return (AE_BAD_PARAMETER);
150 }
151
152 /* Get the info block for the entire GPE register */
153
154 gpe_register_info = gpe_event_info->register_info;
155
156 /* Get the register bitmask for this GPE */
157
158 register_bit = gpe_event_info->register_bit;
159
160 /* GPE currently enabled? (enabled for runtime?) */
161
162 if (register_bit & gpe_register_info->enable_for_run) {
163 local_event_status |= ACPI_EVENT_FLAG_ENABLED;
164 }
165
166 /* GPE enabled for wake? */
167
168 if (register_bit & gpe_register_info->enable_for_wake) {
169 local_event_status |= ACPI_EVENT_FLAG_WAKE_ENABLED;
170 }
171
172 /* GPE currently active (status bit == 1)? */
173
174 status =
175 acpi_hw_low_level_read(8, &in_byte,
176 &gpe_register_info->status_address);
177 if (ACPI_FAILURE(status)) {
178 goto unlock_and_exit;
179 }
180
181 if (register_bit & in_byte) {
182 local_event_status |= ACPI_EVENT_FLAG_SET;
183 }
184
185 /* Set return value */
186
187 (*event_status) = local_event_status;
188
189 unlock_and_exit:
190 return (status);
191}
192#endif /* ACPI_FUTURE_USAGE */
193
194/******************************************************************************
195 *
196 * FUNCTION: acpi_hw_disable_gpe_block
197 *
198 * PARAMETERS: gpe_xrupt_info - GPE Interrupt info
199 * gpe_block - Gpe Block info
200 *
201 * RETURN: Status
202 *
203 * DESCRIPTION: Disable all GPEs within a single GPE block
204 *
205 ******************************************************************************/
206
207acpi_status
208acpi_hw_disable_gpe_block(struct acpi_gpe_xrupt_info * gpe_xrupt_info,
209 struct acpi_gpe_block_info * gpe_block)
210{
211 u32 i;
212 acpi_status status;
213
214 /* Examine each GPE Register within the block */
215
216 for (i = 0; i < gpe_block->register_count; i++) {
217
218 /* Disable all GPEs in this register */
219
220 status = acpi_hw_low_level_write(8, 0x00,
221 &gpe_block->register_info[i].
222 enable_address);
223 if (ACPI_FAILURE(status)) {
224 return (status);
225 }
226 }
227
228 return (AE_OK);
229}
230
231/******************************************************************************
232 *
233 * FUNCTION: acpi_hw_clear_gpe_block
234 *
235 * PARAMETERS: gpe_xrupt_info - GPE Interrupt info
236 * gpe_block - Gpe Block info
237 *
238 * RETURN: Status
239 *
240 * DESCRIPTION: Clear status bits for all GPEs within a single GPE block
241 *
242 ******************************************************************************/
243
244acpi_status
245acpi_hw_clear_gpe_block(struct acpi_gpe_xrupt_info * gpe_xrupt_info,
246 struct acpi_gpe_block_info * gpe_block)
247{
248 u32 i;
249 acpi_status status;
250
251 /* Examine each GPE Register within the block */
252
253 for (i = 0; i < gpe_block->register_count; i++) {
254
255 /* Clear status on all GPEs in this register */
256
257 status = acpi_hw_low_level_write(8, 0xFF,
258 &gpe_block->register_info[i].
259 status_address);
260 if (ACPI_FAILURE(status)) {
261 return (status);
262 }
263 }
264
265 return (AE_OK);
266}
267
268/******************************************************************************
269 *
270 * FUNCTION: acpi_hw_enable_runtime_gpe_block
271 *
272 * PARAMETERS: gpe_xrupt_info - GPE Interrupt info
273 * gpe_block - Gpe Block info
274 *
275 * RETURN: Status
276 *
277 * DESCRIPTION: Enable all "runtime" GPEs within a single GPE block. Includes
278 * combination wake/run GPEs.
279 *
280 ******************************************************************************/
281
282acpi_status
283acpi_hw_enable_runtime_gpe_block(struct acpi_gpe_xrupt_info * gpe_xrupt_info,
284 struct acpi_gpe_block_info * gpe_block)
285{
286 u32 i;
287 acpi_status status;
288
289 /* NOTE: assumes that all GPEs are currently disabled */
290
291 /* Examine each GPE Register within the block */
292
293 for (i = 0; i < gpe_block->register_count; i++) {
294 if (!gpe_block->register_info[i].enable_for_run) {
295 continue;
296 }
297
298 /* Enable all "runtime" GPEs in this register */
299
300 status =
301 acpi_hw_low_level_write(8,
302 gpe_block->register_info[i].
303 enable_for_run,
304 &gpe_block->register_info[i].
305 enable_address);
306 if (ACPI_FAILURE(status)) {
307 return (status);
308 }
309 }
310
311 return (AE_OK);
312}
313
314/******************************************************************************
315 *
316 * FUNCTION: acpi_hw_enable_wakeup_gpe_block
317 *
318 * PARAMETERS: gpe_xrupt_info - GPE Interrupt info
319 * gpe_block - Gpe Block info
320 *
321 * RETURN: Status
322 *
323 * DESCRIPTION: Enable all "wake" GPEs within a single GPE block. Includes
324 * combination wake/run GPEs.
325 *
326 ******************************************************************************/
327
328static acpi_status
329acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
330 struct acpi_gpe_block_info *gpe_block)
331{
332 u32 i;
333 acpi_status status;
334
335 /* Examine each GPE Register within the block */
336
337 for (i = 0; i < gpe_block->register_count; i++) {
338 if (!gpe_block->register_info[i].enable_for_wake) {
339 continue;
340 }
341
342 /* Enable all "wake" GPEs in this register */
343
344 status = acpi_hw_low_level_write(8,
345 gpe_block->register_info[i].
346 enable_for_wake,
347 &gpe_block->register_info[i].
348 enable_address);
349 if (ACPI_FAILURE(status)) {
350 return (status);
351 }
352 }
353
354 return (AE_OK);
355}
356
357/******************************************************************************
358 *
359 * FUNCTION: acpi_hw_disable_all_gpes
360 *
361 * PARAMETERS: None
362 *
363 * RETURN: Status
364 *
365 * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
366 *
367 ******************************************************************************/
368
369acpi_status acpi_hw_disable_all_gpes(void)
370{
371 acpi_status status;
372
373 ACPI_FUNCTION_TRACE(hw_disable_all_gpes);
374
375 status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block);
376 status = acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block);
377 return_ACPI_STATUS(status);
378}
379
380/******************************************************************************
381 *
382 * FUNCTION: acpi_hw_enable_all_runtime_gpes
383 *
384 * PARAMETERS: None
385 *
386 * RETURN: Status
387 *
388 * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
389 *
390 ******************************************************************************/
391
392acpi_status acpi_hw_enable_all_runtime_gpes(void)
393{
394 acpi_status status;
395
396 ACPI_FUNCTION_TRACE(hw_enable_all_runtime_gpes);
397
398 status = acpi_ev_walk_gpe_list(acpi_hw_enable_runtime_gpe_block);
399 return_ACPI_STATUS(status);
400}
401
402/******************************************************************************
403 *
404 * FUNCTION: acpi_hw_enable_all_wakeup_gpes
405 *
406 * PARAMETERS: None
407 *
408 * RETURN: Status
409 *
410 * DESCRIPTION: Enable all "wakeup" GPEs, in all GPE blocks
411 *
412 ******************************************************************************/
413
414acpi_status acpi_hw_enable_all_wakeup_gpes(void)
415{
416 acpi_status status;
417
418 ACPI_FUNCTION_TRACE(hw_enable_all_wakeup_gpes);
419
420 status = acpi_ev_walk_gpe_list(acpi_hw_enable_wakeup_gpe_block);
421 return_ACPI_STATUS(status);
422}