1
2 /******************************************************************************
3 *
4 * Module Name: hwgpe - Low level GPE enable/disable/clear functions
5 *
6 *****************************************************************************/
7
8 /*
9 * Copyright (C) 2000 - 2008, Intel Corp.
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 "accommon.h"
47 #include "acevents.h"
48
49 #define _COMPONENT ACPI_HARDWARE
50 ACPI_MODULE_NAME("hwgpe")
51
52 /* Local prototypes */
53 static acpi_status
54 acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
55 struct acpi_gpe_block_info *gpe_block,
56 void *context);
57
58 /******************************************************************************
59 *
60 * FUNCTION: acpi_hw_low_disable_gpe
61 *
62 * PARAMETERS: gpe_event_info - Info block for the GPE to be disabled
63 *
64 * RETURN: Status
65 *
66 * DESCRIPTION: Disable a single GPE in the enable register.
67 *
68 ******************************************************************************/
69
70 acpi_status acpi_hw_low_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
71 {
72 struct acpi_gpe_register_info *gpe_register_info;
73 acpi_status status;
74 u32 enable_mask;
75
76 /* Get the info block for the entire GPE register */
77
78 gpe_register_info = gpe_event_info->register_info;
79 if (!gpe_register_info) {
80 return (AE_NOT_EXIST);
81 }
82
83 /* Get current value of the enable register that contains this GPE */
84
85 status = acpi_read(&enable_mask, &gpe_register_info->enable_address);
86 if (ACPI_FAILURE(status)) {
87 return (status);
88 }
89
90 /* Clear just the bit that corresponds to this GPE */
91
92 ACPI_CLEAR_BIT(enable_mask, ((u32)1 <<
93 (gpe_event_info->gpe_number -
94 gpe_register_info->base_gpe_number)));
95
96 /* Write the updated enable mask */
97
98 status = acpi_write(enable_mask, &gpe_register_info->enable_address);
99 return (status);
100 }
101
102 /******************************************************************************
103 *
104 * FUNCTION: acpi_hw_write_gpe_enable_reg
105 *
106 * PARAMETERS: gpe_event_info - Info block for the GPE to be enabled
107 *
108 * RETURN: Status
109 *
110 * DESCRIPTION: Write a GPE enable register. Note: The bit for this GPE must
111 * already be cleared or set in the parent register
112 * enable_for_run mask.
113 *
114 ******************************************************************************/
115
116 acpi_status
117 acpi_hw_write_gpe_enable_reg(struct acpi_gpe_event_info * gpe_event_info)
118 {
119 struct acpi_gpe_register_info *gpe_register_info;
120 acpi_status status;
121
122 ACPI_FUNCTION_ENTRY();
123
124 /* Get the info block for the entire GPE register */
125
126 gpe_register_info = gpe_event_info->register_info;
127 if (!gpe_register_info) {
128 return (AE_NOT_EXIST);
129 }
130
131 /* Write the entire GPE (runtime) enable register */
132
133 status = acpi_write(gpe_register_info->enable_for_run,
134 &gpe_register_info->enable_address);
135
136 return (status);
137 }
138
139 /******************************************************************************
140 *
141 * FUNCTION: acpi_hw_clear_gpe
142 *
143 * PARAMETERS: gpe_event_info - Info block for the GPE to be cleared
144 *
145 * RETURN: Status
146 *
147 * DESCRIPTION: Clear the status bit for a single GPE.
148 *
149 ******************************************************************************/
150
151 acpi_status acpi_hw_clear_gpe(struct acpi_gpe_event_info * gpe_event_info)
152 {
153 acpi_status status;
154 u8 register_bit;
155
156 ACPI_FUNCTION_ENTRY();
157
158 register_bit = (u8)(1 <<
159 (gpe_event_info->gpe_number -
160 gpe_event_info->register_info->base_gpe_number));
161
162 /*
163 * Write a one to the appropriate bit in the status register to
164 * clear this GPE.
165 */
166 status = acpi_write(register_bit,
167 &gpe_event_info->register_info->status_address);
168
169 return (status);
170 }
171
172 /******************************************************************************
173 *
174 * FUNCTION: acpi_hw_get_gpe_status
175 *
176 * PARAMETERS: gpe_event_info - Info block for the GPE to queried
177 * event_status - Where the GPE status is returned
178 *
179 * RETURN: Status
180 *
181 * DESCRIPTION: Return the status of a single GPE.
182 *
183 ******************************************************************************/
184
185 acpi_status
186 acpi_hw_get_gpe_status(struct acpi_gpe_event_info * gpe_event_info,
187 acpi_event_status * event_status)
188 {
189 u32 in_byte;
190 u8 register_bit;
191 struct acpi_gpe_register_info *gpe_register_info;
192 acpi_status status;
193 acpi_event_status local_event_status = 0;
194
195 ACPI_FUNCTION_ENTRY();
196
197 if (!event_status) {
198 return (AE_BAD_PARAMETER);
199 }
200
201 /* Get the info block for the entire GPE register */
202
203 gpe_register_info = gpe_event_info->register_info;
204
205 /* Get the register bitmask for this GPE */
206
207 register_bit = (u8)(1 <<
208 (gpe_event_info->gpe_number -
209 gpe_event_info->register_info->base_gpe_number));
210
211 /* GPE currently enabled? (enabled for runtime?) */
212
213 if (register_bit & gpe_register_info->enable_for_run) {
214 local_event_status |= ACPI_EVENT_FLAG_ENABLED;
215 }
216
217 /* GPE enabled for wake? */
218
219 if (register_bit & gpe_register_info->enable_for_wake) {
220 local_event_status |= ACPI_EVENT_FLAG_WAKE_ENABLED;
221 }
222
223 /* GPE currently active (status bit == 1)? */
224
225 status = acpi_read(&in_byte, &gpe_register_info->status_address);
226 if (ACPI_FAILURE(status)) {
227 goto unlock_and_exit;
228 }
229
230 if (register_bit & in_byte) {
231 local_event_status |= ACPI_EVENT_FLAG_SET;
232 }
233
234 /* Set return value */
235
236 (*event_status) = local_event_status;
237
238 unlock_and_exit:
239 return (status);
240 }
241
242 /******************************************************************************
243 *
244 * FUNCTION: acpi_hw_disable_gpe_block
245 *
246 * PARAMETERS: gpe_xrupt_info - GPE Interrupt info
247 * gpe_block - Gpe Block info
248 *
249 * RETURN: Status
250 *
251 * DESCRIPTION: Disable all GPEs within a single GPE block
252 *
253 ******************************************************************************/
254
255 acpi_status
256 acpi_hw_disable_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
257 struct acpi_gpe_block_info *gpe_block, void *context)
258 {
259 u32 i;
260 acpi_status status;
261
262 /* Examine each GPE Register within the block */
263
264 for (i = 0; i < gpe_block->register_count; i++) {
265
266 /* Disable all GPEs in this register */
267
268 status =
269 acpi_write(0x00,
270 &gpe_block->register_info[i].enable_address);
271 if (ACPI_FAILURE(status)) {
272 return (status);
273 }
274 }
275
276 return (AE_OK);
277 }
278
279 /******************************************************************************
280 *
281 * FUNCTION: acpi_hw_clear_gpe_block
282 *
283 * PARAMETERS: gpe_xrupt_info - GPE Interrupt info
284 * gpe_block - Gpe Block info
285 *
286 * RETURN: Status
287 *
288 * DESCRIPTION: Clear status bits for all GPEs within a single GPE block
289 *
290 ******************************************************************************/
291
292 acpi_status
293 acpi_hw_clear_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
294 struct acpi_gpe_block_info *gpe_block, void *context)
295 {
296 u32 i;
297 acpi_status status;
298
299 /* Examine each GPE Register within the block */
300
301 for (i = 0; i < gpe_block->register_count; i++) {
302
303 /* Clear status on all GPEs in this register */
304
305 status =
306 acpi_write(0xFF,
307 &gpe_block->register_info[i].status_address);
308 if (ACPI_FAILURE(status)) {
309 return (status);
310 }
311 }
312
313 return (AE_OK);
314 }
315
316 /******************************************************************************
317 *
318 * FUNCTION: acpi_hw_enable_runtime_gpe_block
319 *
320 * PARAMETERS: gpe_xrupt_info - GPE Interrupt info
321 * gpe_block - Gpe Block info
322 *
323 * RETURN: Status
324 *
325 * DESCRIPTION: Enable all "runtime" GPEs within a single GPE block. Includes
326 * combination wake/run GPEs.
327 *
328 ******************************************************************************/
329
330 acpi_status
331 acpi_hw_enable_runtime_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
332 struct acpi_gpe_block_info *gpe_block, void *context)
333 {
334 u32 i;
335 acpi_status status;
336
337 /* NOTE: assumes that all GPEs are currently disabled */
338
339 /* Examine each GPE Register within the block */
340
341 for (i = 0; i < gpe_block->register_count; i++) {
342 if (!gpe_block->register_info[i].enable_for_run) {
343 continue;
344 }
345
346 /* Enable all "runtime" GPEs in this register */
347
348 status = acpi_write(gpe_block->register_info[i].enable_for_run,
349 &gpe_block->register_info[i].
350 enable_address);
351 if (ACPI_FAILURE(status)) {
352 return (status);
353 }
354 }
355
356 return (AE_OK);
357 }
358
359 /******************************************************************************
360 *
361 * FUNCTION: acpi_hw_enable_wakeup_gpe_block
362 *
363 * PARAMETERS: gpe_xrupt_info - GPE Interrupt info
364 * gpe_block - Gpe Block info
365 *
366 * RETURN: Status
367 *
368 * DESCRIPTION: Enable all "wake" GPEs within a single GPE block. Includes
369 * combination wake/run GPEs.
370 *
371 ******************************************************************************/
372
373 static acpi_status
374 acpi_hw_enable_wakeup_gpe_block(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
375 struct acpi_gpe_block_info *gpe_block,
376 void *context)
377 {
378 u32 i;
379 acpi_status status;
380
381 /* Examine each GPE Register within the block */
382
383 for (i = 0; i < gpe_block->register_count; i++) {
384 if (!gpe_block->register_info[i].enable_for_wake) {
385 continue;
386 }
387
388 /* Enable all "wake" GPEs in this register */
389
390 status = acpi_write(gpe_block->register_info[i].enable_for_wake,
391 &gpe_block->register_info[i].
392 enable_address);
393 if (ACPI_FAILURE(status)) {
394 return (status);
395 }
396 }
397
398 return (AE_OK);
399 }
400
401 /******************************************************************************
402 *
403 * FUNCTION: acpi_hw_disable_all_gpes
404 *
405 * PARAMETERS: None
406 *
407 * RETURN: Status
408 *
409 * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
410 *
411 ******************************************************************************/
412
413 acpi_status acpi_hw_disable_all_gpes(void)
414 {
415 acpi_status status;
416
417 ACPI_FUNCTION_TRACE(hw_disable_all_gpes);
418
419 status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block, NULL);
420 status = acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block, NULL);
421 return_ACPI_STATUS(status);
422 }
423
424 /******************************************************************************
425 *
426 * FUNCTION: acpi_hw_enable_all_runtime_gpes
427 *
428 * PARAMETERS: None
429 *
430 * RETURN: Status
431 *
432 * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
433 *
434 ******************************************************************************/
435
436 acpi_status acpi_hw_enable_all_runtime_gpes(void)
437 {
438 acpi_status status;
439
440 ACPI_FUNCTION_TRACE(hw_enable_all_runtime_gpes);
441
442 status = acpi_ev_walk_gpe_list(acpi_hw_enable_runtime_gpe_block, NULL);
443 return_ACPI_STATUS(status);
444 }
445
446 /******************************************************************************
447 *
448 * FUNCTION: acpi_hw_enable_all_wakeup_gpes
449 *
450 * PARAMETERS: None
451 *
452 * RETURN: Status
453 *
454 * DESCRIPTION: Enable all "wakeup" GPEs, in all GPE blocks
455 *
456 ******************************************************************************/
457
458 acpi_status acpi_hw_enable_all_wakeup_gpes(void)
459 {
460 acpi_status status;
461
462 ACPI_FUNCTION_TRACE(hw_enable_all_wakeup_gpes);
463
464 status = acpi_ev_walk_gpe_list(acpi_hw_enable_wakeup_gpe_block, NULL);
465 return_ACPI_STATUS(status);
466 }
467
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