Commit | Line | Data |
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1da177e4 LT |
1 | |
2 | /******************************************************************************* | |
3 | * | |
4 | * Module Name: hwregs - Read/write access functions for the various ACPI | |
5 | * control and status registers. | |
6 | * | |
7 | ******************************************************************************/ | |
8 | ||
9 | /* | |
4a90c7e8 | 10 | * Copyright (C) 2000 - 2006, R. Byron Moore |
1da177e4 LT |
11 | * All rights reserved. |
12 | * | |
13 | * Redistribution and use in source and binary forms, with or without | |
14 | * modification, are permitted provided that the following conditions | |
15 | * are met: | |
16 | * 1. Redistributions of source code must retain the above copyright | |
17 | * notice, this list of conditions, and the following disclaimer, | |
18 | * without modification. | |
19 | * 2. Redistributions in binary form must reproduce at minimum a disclaimer | |
20 | * substantially similar to the "NO WARRANTY" disclaimer below | |
21 | * ("Disclaimer") and any redistribution must be conditioned upon | |
22 | * including a substantially similar Disclaimer requirement for further | |
23 | * binary redistribution. | |
24 | * 3. Neither the names of the above-listed copyright holders nor the names | |
25 | * of any contributors may be used to endorse or promote products derived | |
26 | * from this software without specific prior written permission. | |
27 | * | |
28 | * Alternatively, this software may be distributed under the terms of the | |
29 | * GNU General Public License ("GPL") version 2 as published by the Free | |
30 | * Software Foundation. | |
31 | * | |
32 | * NO WARRANTY | |
33 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
34 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
35 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR | |
36 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
37 | * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
38 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
39 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
40 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
41 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
42 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
43 | * POSSIBILITY OF SUCH DAMAGES. | |
44 | */ | |
45 | ||
46 | #include <linux/module.h> | |
47 | ||
48 | #include <acpi/acpi.h> | |
49 | #include <acpi/acnamesp.h> | |
50 | #include <acpi/acevents.h> | |
51 | ||
52 | #define _COMPONENT ACPI_HARDWARE | |
4be44fcd | 53 | ACPI_MODULE_NAME("hwregs") |
1da177e4 LT |
54 | |
55 | /******************************************************************************* | |
56 | * | |
57 | * FUNCTION: acpi_hw_clear_acpi_status | |
58 | * | |
59 | * PARAMETERS: Flags - Lock the hardware or not | |
60 | * | |
61 | * RETURN: none | |
62 | * | |
63 | * DESCRIPTION: Clears all fixed and general purpose status bits | |
64 | * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED | |
65 | * | |
66 | ******************************************************************************/ | |
4be44fcd | 67 | acpi_status acpi_hw_clear_acpi_status(u32 flags) |
1da177e4 | 68 | { |
4be44fcd | 69 | acpi_status status; |
1da177e4 | 70 | |
4be44fcd | 71 | ACPI_FUNCTION_TRACE("hw_clear_acpi_status"); |
1da177e4 | 72 | |
4be44fcd LB |
73 | ACPI_DEBUG_PRINT((ACPI_DB_IO, "About to write %04X to %04X\n", |
74 | ACPI_BITMASK_ALL_FIXED_STATUS, | |
75 | (u16) acpi_gbl_FADT->xpm1a_evt_blk.address)); | |
1da177e4 LT |
76 | |
77 | if (flags & ACPI_MTX_LOCK) { | |
4be44fcd LB |
78 | status = acpi_ut_acquire_mutex(ACPI_MTX_HARDWARE); |
79 | if (ACPI_FAILURE(status)) { | |
80 | return_ACPI_STATUS(status); | |
1da177e4 LT |
81 | } |
82 | } | |
83 | ||
4be44fcd LB |
84 | status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK, |
85 | ACPI_REGISTER_PM1_STATUS, | |
86 | ACPI_BITMASK_ALL_FIXED_STATUS); | |
87 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
88 | goto unlock_and_exit; |
89 | } | |
90 | ||
91 | /* Clear the fixed events */ | |
92 | ||
93 | if (acpi_gbl_FADT->xpm1b_evt_blk.address) { | |
4be44fcd LB |
94 | status = |
95 | acpi_hw_low_level_write(16, ACPI_BITMASK_ALL_FIXED_STATUS, | |
96 | &acpi_gbl_FADT->xpm1b_evt_blk); | |
97 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
98 | goto unlock_and_exit; |
99 | } | |
100 | } | |
101 | ||
102 | /* Clear the GPE Bits in all GPE registers in all GPE blocks */ | |
103 | ||
4be44fcd | 104 | status = acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block); |
1da177e4 | 105 | |
4be44fcd | 106 | unlock_and_exit: |
1da177e4 | 107 | if (flags & ACPI_MTX_LOCK) { |
4be44fcd | 108 | (void)acpi_ut_release_mutex(ACPI_MTX_HARDWARE); |
1da177e4 | 109 | } |
4be44fcd | 110 | return_ACPI_STATUS(status); |
1da177e4 LT |
111 | } |
112 | ||
1da177e4 LT |
113 | /******************************************************************************* |
114 | * | |
115 | * FUNCTION: acpi_get_sleep_type_data | |
116 | * | |
117 | * PARAMETERS: sleep_state - Numeric sleep state | |
118 | * *sleep_type_a - Where SLP_TYPa is returned | |
119 | * *sleep_type_b - Where SLP_TYPb is returned | |
120 | * | |
121 | * RETURN: Status - ACPI status | |
122 | * | |
123 | * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested sleep | |
124 | * state. | |
125 | * | |
126 | ******************************************************************************/ | |
127 | ||
128 | acpi_status | |
4be44fcd | 129 | acpi_get_sleep_type_data(u8 sleep_state, u8 * sleep_type_a, u8 * sleep_type_b) |
1da177e4 | 130 | { |
4be44fcd LB |
131 | acpi_status status = AE_OK; |
132 | struct acpi_parameter_info info; | |
133 | char *sleep_state_name; | |
1da177e4 | 134 | |
4be44fcd | 135 | ACPI_FUNCTION_TRACE("acpi_get_sleep_type_data"); |
1da177e4 | 136 | |
44f6c012 RM |
137 | /* Validate parameters */ |
138 | ||
4be44fcd LB |
139 | if ((sleep_state > ACPI_S_STATES_MAX) || !sleep_type_a || !sleep_type_b) { |
140 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
1da177e4 LT |
141 | } |
142 | ||
44f6c012 RM |
143 | /* Evaluate the namespace object containing the values for this state */ |
144 | ||
1da177e4 | 145 | info.parameters = NULL; |
44f6c012 | 146 | info.return_object = NULL; |
defba1d8 BM |
147 | sleep_state_name = |
148 | ACPI_CAST_PTR(char, acpi_gbl_sleep_state_names[sleep_state]); | |
44f6c012 | 149 | |
4be44fcd LB |
150 | status = acpi_ns_evaluate_by_name(sleep_state_name, &info); |
151 | if (ACPI_FAILURE(status)) { | |
152 | ACPI_DEBUG_PRINT((ACPI_DB_EXEC, | |
153 | "%s while evaluating sleep_state [%s]\n", | |
154 | acpi_format_exception(status), | |
155 | sleep_state_name)); | |
1da177e4 | 156 | |
4be44fcd | 157 | return_ACPI_STATUS(status); |
1da177e4 LT |
158 | } |
159 | ||
160 | /* Must have a return object */ | |
161 | ||
162 | if (!info.return_object) { | |
4be44fcd LB |
163 | ACPI_REPORT_ERROR(("No Sleep State object returned from [%s]\n", |
164 | sleep_state_name)); | |
1da177e4 LT |
165 | status = AE_NOT_EXIST; |
166 | } | |
167 | ||
168 | /* It must be of type Package */ | |
169 | ||
4be44fcd LB |
170 | else if (ACPI_GET_OBJECT_TYPE(info.return_object) != ACPI_TYPE_PACKAGE) { |
171 | ACPI_REPORT_ERROR(("Sleep State return object is not a Package\n")); | |
1da177e4 LT |
172 | status = AE_AML_OPERAND_TYPE; |
173 | } | |
174 | ||
44f6c012 RM |
175 | /* |
176 | * The package must have at least two elements. NOTE (March 2005): This | |
177 | * goes against the current ACPI spec which defines this object as a | |
178 | * package with one encoded DWORD element. However, existing practice | |
179 | * by BIOS vendors seems to be to have 2 or more elements, at least | |
180 | * one per sleep type (A/B). | |
181 | */ | |
1da177e4 | 182 | else if (info.return_object->package.count < 2) { |
4be44fcd | 183 | ACPI_REPORT_ERROR(("Sleep State return package does not have at least two elements\n")); |
1da177e4 LT |
184 | status = AE_AML_NO_OPERAND; |
185 | } | |
186 | ||
187 | /* The first two elements must both be of type Integer */ | |
188 | ||
4be44fcd LB |
189 | else if ((ACPI_GET_OBJECT_TYPE(info.return_object->package.elements[0]) |
190 | != ACPI_TYPE_INTEGER) || | |
191 | (ACPI_GET_OBJECT_TYPE(info.return_object->package.elements[1]) | |
192 | != ACPI_TYPE_INTEGER)) { | |
193 | ACPI_REPORT_ERROR(("Sleep State return package elements are not both Integers (%s, %s)\n", acpi_ut_get_object_type_name(info.return_object->package.elements[0]), acpi_ut_get_object_type_name(info.return_object->package.elements[1]))); | |
1da177e4 | 194 | status = AE_AML_OPERAND_TYPE; |
4be44fcd | 195 | } else { |
44f6c012 RM |
196 | /* Valid _Sx_ package size, type, and value */ |
197 | ||
198 | *sleep_type_a = (u8) | |
4be44fcd | 199 | (info.return_object->package.elements[0])->integer.value; |
44f6c012 | 200 | *sleep_type_b = (u8) |
4be44fcd | 201 | (info.return_object->package.elements[1])->integer.value; |
1da177e4 LT |
202 | } |
203 | ||
4be44fcd | 204 | if (ACPI_FAILURE(status)) { |
4a90c7e8 | 205 | ACPI_REPORT_ERROR(("%s While evaluating sleep_state [%s], bad Sleep object %p type %s\n", acpi_format_exception(status), sleep_state_name, info.return_object, acpi_ut_get_object_type_name(info.return_object))); |
1da177e4 LT |
206 | } |
207 | ||
4be44fcd LB |
208 | acpi_ut_remove_reference(info.return_object); |
209 | return_ACPI_STATUS(status); | |
1da177e4 | 210 | } |
1da177e4 | 211 | |
4be44fcd | 212 | EXPORT_SYMBOL(acpi_get_sleep_type_data); |
1da177e4 LT |
213 | |
214 | /******************************************************************************* | |
215 | * | |
216 | * FUNCTION: acpi_hw_get_register_bit_mask | |
217 | * | |
218 | * PARAMETERS: register_id - Index of ACPI Register to access | |
219 | * | |
44f6c012 | 220 | * RETURN: The bitmask to be used when accessing the register |
1da177e4 | 221 | * |
44f6c012 | 222 | * DESCRIPTION: Map register_id into a register bitmask. |
1da177e4 LT |
223 | * |
224 | ******************************************************************************/ | |
225 | ||
4be44fcd | 226 | struct acpi_bit_register_info *acpi_hw_get_bit_register_info(u32 register_id) |
1da177e4 | 227 | { |
4a90c7e8 | 228 | ACPI_FUNCTION_ENTRY(); |
1da177e4 LT |
229 | |
230 | if (register_id > ACPI_BITREG_MAX) { | |
4a90c7e8 BM |
231 | ACPI_REPORT_ERROR(("Invalid bit_register ID: %X\n", |
232 | register_id)); | |
1da177e4 LT |
233 | return (NULL); |
234 | } | |
235 | ||
236 | return (&acpi_gbl_bit_register_info[register_id]); | |
237 | } | |
238 | ||
1da177e4 LT |
239 | /******************************************************************************* |
240 | * | |
241 | * FUNCTION: acpi_get_register | |
242 | * | |
243 | * PARAMETERS: register_id - ID of ACPI bit_register to access | |
244 | * return_value - Value that was read from the register | |
245 | * Flags - Lock the hardware or not | |
246 | * | |
247 | * RETURN: Status and the value read from specified Register. Value | |
248 | * returned is normalized to bit0 (is shifted all the way right) | |
249 | * | |
250 | * DESCRIPTION: ACPI bit_register read function. | |
251 | * | |
252 | ******************************************************************************/ | |
253 | ||
4be44fcd | 254 | acpi_status acpi_get_register(u32 register_id, u32 * return_value, u32 flags) |
1da177e4 | 255 | { |
4be44fcd LB |
256 | u32 register_value = 0; |
257 | struct acpi_bit_register_info *bit_reg_info; | |
258 | acpi_status status; | |
1da177e4 | 259 | |
4be44fcd | 260 | ACPI_FUNCTION_TRACE("acpi_get_register"); |
1da177e4 LT |
261 | |
262 | /* Get the info structure corresponding to the requested ACPI Register */ | |
263 | ||
4be44fcd | 264 | bit_reg_info = acpi_hw_get_bit_register_info(register_id); |
1da177e4 | 265 | if (!bit_reg_info) { |
4be44fcd | 266 | return_ACPI_STATUS(AE_BAD_PARAMETER); |
1da177e4 LT |
267 | } |
268 | ||
269 | if (flags & ACPI_MTX_LOCK) { | |
4be44fcd LB |
270 | status = acpi_ut_acquire_mutex(ACPI_MTX_HARDWARE); |
271 | if (ACPI_FAILURE(status)) { | |
272 | return_ACPI_STATUS(status); | |
1da177e4 LT |
273 | } |
274 | } | |
275 | ||
276 | /* Read from the register */ | |
277 | ||
4be44fcd LB |
278 | status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK, |
279 | bit_reg_info->parent_register, | |
280 | ®ister_value); | |
1da177e4 LT |
281 | |
282 | if (flags & ACPI_MTX_LOCK) { | |
4be44fcd | 283 | (void)acpi_ut_release_mutex(ACPI_MTX_HARDWARE); |
1da177e4 LT |
284 | } |
285 | ||
4be44fcd | 286 | if (ACPI_SUCCESS(status)) { |
1da177e4 LT |
287 | /* Normalize the value that was read */ |
288 | ||
4be44fcd LB |
289 | register_value = |
290 | ((register_value & bit_reg_info->access_bit_mask) | |
291 | >> bit_reg_info->bit_position); | |
1da177e4 LT |
292 | |
293 | *return_value = register_value; | |
294 | ||
4be44fcd LB |
295 | ACPI_DEBUG_PRINT((ACPI_DB_IO, "Read value %8.8X register %X\n", |
296 | register_value, | |
297 | bit_reg_info->parent_register)); | |
1da177e4 LT |
298 | } |
299 | ||
4be44fcd | 300 | return_ACPI_STATUS(status); |
1da177e4 | 301 | } |
1da177e4 | 302 | |
4be44fcd | 303 | EXPORT_SYMBOL(acpi_get_register); |
1da177e4 LT |
304 | |
305 | /******************************************************************************* | |
306 | * | |
307 | * FUNCTION: acpi_set_register | |
308 | * | |
309 | * PARAMETERS: register_id - ID of ACPI bit_register to access | |
310 | * Value - (only used on write) value to write to the | |
311 | * Register, NOT pre-normalized to the bit pos | |
312 | * Flags - Lock the hardware or not | |
313 | * | |
314 | * RETURN: Status | |
315 | * | |
316 | * DESCRIPTION: ACPI Bit Register write function. | |
317 | * | |
318 | ******************************************************************************/ | |
319 | ||
4be44fcd | 320 | acpi_status acpi_set_register(u32 register_id, u32 value, u32 flags) |
1da177e4 | 321 | { |
4be44fcd LB |
322 | u32 register_value = 0; |
323 | struct acpi_bit_register_info *bit_reg_info; | |
324 | acpi_status status; | |
1da177e4 | 325 | |
4be44fcd | 326 | ACPI_FUNCTION_TRACE_U32("acpi_set_register", register_id); |
1da177e4 LT |
327 | |
328 | /* Get the info structure corresponding to the requested ACPI Register */ | |
329 | ||
4be44fcd | 330 | bit_reg_info = acpi_hw_get_bit_register_info(register_id); |
1da177e4 | 331 | if (!bit_reg_info) { |
4be44fcd LB |
332 | ACPI_REPORT_ERROR(("Bad ACPI HW register_id: %X\n", |
333 | register_id)); | |
334 | return_ACPI_STATUS(AE_BAD_PARAMETER); | |
1da177e4 LT |
335 | } |
336 | ||
337 | if (flags & ACPI_MTX_LOCK) { | |
4be44fcd LB |
338 | status = acpi_ut_acquire_mutex(ACPI_MTX_HARDWARE); |
339 | if (ACPI_FAILURE(status)) { | |
340 | return_ACPI_STATUS(status); | |
1da177e4 LT |
341 | } |
342 | } | |
343 | ||
344 | /* Always do a register read first so we can insert the new bits */ | |
345 | ||
4be44fcd LB |
346 | status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK, |
347 | bit_reg_info->parent_register, | |
348 | ®ister_value); | |
349 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
350 | goto unlock_and_exit; |
351 | } | |
352 | ||
353 | /* | |
354 | * Decode the Register ID | |
355 | * Register ID = [Register block ID] | [bit ID] | |
356 | * | |
357 | * Check bit ID to fine locate Register offset. | |
358 | * Check Mask to determine Register offset, and then read-write. | |
359 | */ | |
360 | switch (bit_reg_info->parent_register) { | |
361 | case ACPI_REGISTER_PM1_STATUS: | |
362 | ||
363 | /* | |
364 | * Status Registers are different from the rest. Clear by | |
365 | * writing 1, and writing 0 has no effect. So, the only relevant | |
366 | * information is the single bit we're interested in, all others should | |
367 | * be written as 0 so they will be left unchanged. | |
368 | */ | |
4be44fcd LB |
369 | value = ACPI_REGISTER_PREPARE_BITS(value, |
370 | bit_reg_info->bit_position, | |
371 | bit_reg_info-> | |
372 | access_bit_mask); | |
1da177e4 | 373 | if (value) { |
4be44fcd LB |
374 | status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK, |
375 | ACPI_REGISTER_PM1_STATUS, | |
376 | (u16) value); | |
1da177e4 LT |
377 | register_value = 0; |
378 | } | |
379 | break; | |
380 | ||
1da177e4 LT |
381 | case ACPI_REGISTER_PM1_ENABLE: |
382 | ||
4be44fcd LB |
383 | ACPI_REGISTER_INSERT_VALUE(register_value, |
384 | bit_reg_info->bit_position, | |
385 | bit_reg_info->access_bit_mask, | |
386 | value); | |
1da177e4 | 387 | |
4be44fcd LB |
388 | status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK, |
389 | ACPI_REGISTER_PM1_ENABLE, | |
390 | (u16) register_value); | |
1da177e4 LT |
391 | break; |
392 | ||
1da177e4 LT |
393 | case ACPI_REGISTER_PM1_CONTROL: |
394 | ||
395 | /* | |
396 | * Write the PM1 Control register. | |
397 | * Note that at this level, the fact that there are actually TWO | |
398 | * registers (A and B - and B may not exist) is abstracted. | |
399 | */ | |
4be44fcd LB |
400 | ACPI_DEBUG_PRINT((ACPI_DB_IO, "PM1 control: Read %X\n", |
401 | register_value)); | |
1da177e4 | 402 | |
4be44fcd LB |
403 | ACPI_REGISTER_INSERT_VALUE(register_value, |
404 | bit_reg_info->bit_position, | |
405 | bit_reg_info->access_bit_mask, | |
406 | value); | |
1da177e4 | 407 | |
4be44fcd LB |
408 | status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK, |
409 | ACPI_REGISTER_PM1_CONTROL, | |
410 | (u16) register_value); | |
1da177e4 LT |
411 | break; |
412 | ||
1da177e4 LT |
413 | case ACPI_REGISTER_PM2_CONTROL: |
414 | ||
4be44fcd LB |
415 | status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK, |
416 | ACPI_REGISTER_PM2_CONTROL, | |
417 | ®ister_value); | |
418 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
419 | goto unlock_and_exit; |
420 | } | |
421 | ||
4be44fcd LB |
422 | ACPI_DEBUG_PRINT((ACPI_DB_IO, |
423 | "PM2 control: Read %X from %8.8X%8.8X\n", | |
424 | register_value, | |
425 | ACPI_FORMAT_UINT64(acpi_gbl_FADT-> | |
426 | xpm2_cnt_blk.address))); | |
427 | ||
428 | ACPI_REGISTER_INSERT_VALUE(register_value, | |
429 | bit_reg_info->bit_position, | |
430 | bit_reg_info->access_bit_mask, | |
431 | value); | |
432 | ||
433 | ACPI_DEBUG_PRINT((ACPI_DB_IO, | |
434 | "About to write %4.4X to %8.8X%8.8X\n", | |
435 | register_value, | |
436 | ACPI_FORMAT_UINT64(acpi_gbl_FADT-> | |
437 | xpm2_cnt_blk.address))); | |
438 | ||
439 | status = acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK, | |
440 | ACPI_REGISTER_PM2_CONTROL, | |
441 | (u8) (register_value)); | |
1da177e4 LT |
442 | break; |
443 | ||
1da177e4 LT |
444 | default: |
445 | break; | |
446 | } | |
447 | ||
4be44fcd | 448 | unlock_and_exit: |
1da177e4 LT |
449 | |
450 | if (flags & ACPI_MTX_LOCK) { | |
4be44fcd | 451 | (void)acpi_ut_release_mutex(ACPI_MTX_HARDWARE); |
1da177e4 LT |
452 | } |
453 | ||
454 | /* Normalize the value that was read */ | |
455 | ||
4be44fcd LB |
456 | ACPI_DEBUG_EXEC(register_value = |
457 | ((register_value & bit_reg_info->access_bit_mask) >> | |
458 | bit_reg_info->bit_position)); | |
1da177e4 | 459 | |
4be44fcd LB |
460 | ACPI_DEBUG_PRINT((ACPI_DB_IO, |
461 | "Set bits: %8.8X actual %8.8X register %X\n", value, | |
462 | register_value, bit_reg_info->parent_register)); | |
463 | return_ACPI_STATUS(status); | |
1da177e4 | 464 | } |
1da177e4 | 465 | |
4be44fcd | 466 | EXPORT_SYMBOL(acpi_set_register); |
1da177e4 LT |
467 | |
468 | /****************************************************************************** | |
469 | * | |
470 | * FUNCTION: acpi_hw_register_read | |
471 | * | |
472 | * PARAMETERS: use_lock - Mutex hw access | |
473 | * register_id - register_iD + Offset | |
44f6c012 | 474 | * return_value - Where the register value is returned |
1da177e4 LT |
475 | * |
476 | * RETURN: Status and the value read. | |
477 | * | |
478 | * DESCRIPTION: Acpi register read function. Registers are read at the | |
479 | * given offset. | |
480 | * | |
481 | ******************************************************************************/ | |
482 | ||
483 | acpi_status | |
4be44fcd | 484 | acpi_hw_register_read(u8 use_lock, u32 register_id, u32 * return_value) |
1da177e4 | 485 | { |
4be44fcd LB |
486 | u32 value1 = 0; |
487 | u32 value2 = 0; | |
488 | acpi_status status; | |
1da177e4 | 489 | |
4be44fcd | 490 | ACPI_FUNCTION_TRACE("hw_register_read"); |
1da177e4 LT |
491 | |
492 | if (ACPI_MTX_LOCK == use_lock) { | |
4be44fcd LB |
493 | status = acpi_ut_acquire_mutex(ACPI_MTX_HARDWARE); |
494 | if (ACPI_FAILURE(status)) { | |
495 | return_ACPI_STATUS(status); | |
1da177e4 LT |
496 | } |
497 | } | |
498 | ||
499 | switch (register_id) { | |
4be44fcd | 500 | case ACPI_REGISTER_PM1_STATUS: /* 16-bit access */ |
1da177e4 | 501 | |
4be44fcd LB |
502 | status = |
503 | acpi_hw_low_level_read(16, &value1, | |
504 | &acpi_gbl_FADT->xpm1a_evt_blk); | |
505 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
506 | goto unlock_and_exit; |
507 | } | |
508 | ||
509 | /* PM1B is optional */ | |
510 | ||
4be44fcd LB |
511 | status = |
512 | acpi_hw_low_level_read(16, &value2, | |
513 | &acpi_gbl_FADT->xpm1b_evt_blk); | |
1da177e4 LT |
514 | value1 |= value2; |
515 | break; | |
516 | ||
4be44fcd | 517 | case ACPI_REGISTER_PM1_ENABLE: /* 16-bit access */ |
1da177e4 | 518 | |
4be44fcd LB |
519 | status = |
520 | acpi_hw_low_level_read(16, &value1, &acpi_gbl_xpm1a_enable); | |
521 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
522 | goto unlock_and_exit; |
523 | } | |
524 | ||
525 | /* PM1B is optional */ | |
526 | ||
4be44fcd LB |
527 | status = |
528 | acpi_hw_low_level_read(16, &value2, &acpi_gbl_xpm1b_enable); | |
1da177e4 LT |
529 | value1 |= value2; |
530 | break; | |
531 | ||
4be44fcd | 532 | case ACPI_REGISTER_PM1_CONTROL: /* 16-bit access */ |
1da177e4 | 533 | |
4be44fcd LB |
534 | status = |
535 | acpi_hw_low_level_read(16, &value1, | |
536 | &acpi_gbl_FADT->xpm1a_cnt_blk); | |
537 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
538 | goto unlock_and_exit; |
539 | } | |
540 | ||
4be44fcd LB |
541 | status = |
542 | acpi_hw_low_level_read(16, &value2, | |
543 | &acpi_gbl_FADT->xpm1b_cnt_blk); | |
1da177e4 LT |
544 | value1 |= value2; |
545 | break; | |
546 | ||
4be44fcd | 547 | case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */ |
1da177e4 | 548 | |
4be44fcd LB |
549 | status = |
550 | acpi_hw_low_level_read(8, &value1, | |
551 | &acpi_gbl_FADT->xpm2_cnt_blk); | |
1da177e4 LT |
552 | break; |
553 | ||
4be44fcd | 554 | case ACPI_REGISTER_PM_TIMER: /* 32-bit access */ |
1da177e4 | 555 | |
4be44fcd LB |
556 | status = |
557 | acpi_hw_low_level_read(32, &value1, | |
558 | &acpi_gbl_FADT->xpm_tmr_blk); | |
1da177e4 LT |
559 | break; |
560 | ||
4be44fcd | 561 | case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */ |
1da177e4 | 562 | |
4be44fcd | 563 | status = acpi_os_read_port(acpi_gbl_FADT->smi_cmd, &value1, 8); |
1da177e4 LT |
564 | break; |
565 | ||
566 | default: | |
4a90c7e8 | 567 | ACPI_REPORT_ERROR(("Unknown Register ID: %X\n", register_id)); |
1da177e4 LT |
568 | status = AE_BAD_PARAMETER; |
569 | break; | |
570 | } | |
571 | ||
4be44fcd | 572 | unlock_and_exit: |
1da177e4 | 573 | if (ACPI_MTX_LOCK == use_lock) { |
4be44fcd | 574 | (void)acpi_ut_release_mutex(ACPI_MTX_HARDWARE); |
1da177e4 LT |
575 | } |
576 | ||
4be44fcd | 577 | if (ACPI_SUCCESS(status)) { |
1da177e4 LT |
578 | *return_value = value1; |
579 | } | |
580 | ||
4be44fcd | 581 | return_ACPI_STATUS(status); |
1da177e4 LT |
582 | } |
583 | ||
1da177e4 LT |
584 | /****************************************************************************** |
585 | * | |
586 | * FUNCTION: acpi_hw_register_write | |
587 | * | |
588 | * PARAMETERS: use_lock - Mutex hw access | |
589 | * register_id - register_iD + Offset | |
590 | * Value - The value to write | |
591 | * | |
592 | * RETURN: Status | |
593 | * | |
594 | * DESCRIPTION: Acpi register Write function. Registers are written at the | |
595 | * given offset. | |
596 | * | |
597 | ******************************************************************************/ | |
598 | ||
4be44fcd | 599 | acpi_status acpi_hw_register_write(u8 use_lock, u32 register_id, u32 value) |
1da177e4 | 600 | { |
4be44fcd | 601 | acpi_status status; |
1da177e4 | 602 | |
4be44fcd | 603 | ACPI_FUNCTION_TRACE("hw_register_write"); |
1da177e4 LT |
604 | |
605 | if (ACPI_MTX_LOCK == use_lock) { | |
4be44fcd LB |
606 | status = acpi_ut_acquire_mutex(ACPI_MTX_HARDWARE); |
607 | if (ACPI_FAILURE(status)) { | |
608 | return_ACPI_STATUS(status); | |
1da177e4 LT |
609 | } |
610 | } | |
611 | ||
612 | switch (register_id) { | |
4be44fcd | 613 | case ACPI_REGISTER_PM1_STATUS: /* 16-bit access */ |
1da177e4 | 614 | |
4be44fcd LB |
615 | status = |
616 | acpi_hw_low_level_write(16, value, | |
617 | &acpi_gbl_FADT->xpm1a_evt_blk); | |
618 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
619 | goto unlock_and_exit; |
620 | } | |
621 | ||
622 | /* PM1B is optional */ | |
623 | ||
4be44fcd LB |
624 | status = |
625 | acpi_hw_low_level_write(16, value, | |
626 | &acpi_gbl_FADT->xpm1b_evt_blk); | |
1da177e4 LT |
627 | break; |
628 | ||
4be44fcd | 629 | case ACPI_REGISTER_PM1_ENABLE: /* 16-bit access */ |
1da177e4 | 630 | |
4be44fcd LB |
631 | status = |
632 | acpi_hw_low_level_write(16, value, &acpi_gbl_xpm1a_enable); | |
633 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
634 | goto unlock_and_exit; |
635 | } | |
636 | ||
637 | /* PM1B is optional */ | |
638 | ||
4be44fcd LB |
639 | status = |
640 | acpi_hw_low_level_write(16, value, &acpi_gbl_xpm1b_enable); | |
1da177e4 LT |
641 | break; |
642 | ||
4be44fcd | 643 | case ACPI_REGISTER_PM1_CONTROL: /* 16-bit access */ |
1da177e4 | 644 | |
4be44fcd LB |
645 | status = |
646 | acpi_hw_low_level_write(16, value, | |
647 | &acpi_gbl_FADT->xpm1a_cnt_blk); | |
648 | if (ACPI_FAILURE(status)) { | |
1da177e4 LT |
649 | goto unlock_and_exit; |
650 | } | |
651 | ||
4be44fcd LB |
652 | status = |
653 | acpi_hw_low_level_write(16, value, | |
654 | &acpi_gbl_FADT->xpm1b_cnt_blk); | |
1da177e4 LT |
655 | break; |
656 | ||
4be44fcd | 657 | case ACPI_REGISTER_PM1A_CONTROL: /* 16-bit access */ |
1da177e4 | 658 | |
4be44fcd LB |
659 | status = |
660 | acpi_hw_low_level_write(16, value, | |
661 | &acpi_gbl_FADT->xpm1a_cnt_blk); | |
1da177e4 LT |
662 | break; |
663 | ||
4be44fcd | 664 | case ACPI_REGISTER_PM1B_CONTROL: /* 16-bit access */ |
1da177e4 | 665 | |
4be44fcd LB |
666 | status = |
667 | acpi_hw_low_level_write(16, value, | |
668 | &acpi_gbl_FADT->xpm1b_cnt_blk); | |
1da177e4 LT |
669 | break; |
670 | ||
4be44fcd | 671 | case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */ |
1da177e4 | 672 | |
4be44fcd LB |
673 | status = |
674 | acpi_hw_low_level_write(8, value, | |
675 | &acpi_gbl_FADT->xpm2_cnt_blk); | |
1da177e4 LT |
676 | break; |
677 | ||
4be44fcd | 678 | case ACPI_REGISTER_PM_TIMER: /* 32-bit access */ |
1da177e4 | 679 | |
4be44fcd LB |
680 | status = |
681 | acpi_hw_low_level_write(32, value, | |
682 | &acpi_gbl_FADT->xpm_tmr_blk); | |
1da177e4 LT |
683 | break; |
684 | ||
4be44fcd | 685 | case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */ |
1da177e4 LT |
686 | |
687 | /* SMI_CMD is currently always in IO space */ | |
688 | ||
4be44fcd | 689 | status = acpi_os_write_port(acpi_gbl_FADT->smi_cmd, value, 8); |
1da177e4 LT |
690 | break; |
691 | ||
1da177e4 LT |
692 | default: |
693 | status = AE_BAD_PARAMETER; | |
694 | break; | |
695 | } | |
696 | ||
4be44fcd | 697 | unlock_and_exit: |
1da177e4 | 698 | if (ACPI_MTX_LOCK == use_lock) { |
4be44fcd | 699 | (void)acpi_ut_release_mutex(ACPI_MTX_HARDWARE); |
1da177e4 LT |
700 | } |
701 | ||
4be44fcd | 702 | return_ACPI_STATUS(status); |
1da177e4 LT |
703 | } |
704 | ||
1da177e4 LT |
705 | /****************************************************************************** |
706 | * | |
707 | * FUNCTION: acpi_hw_low_level_read | |
708 | * | |
709 | * PARAMETERS: Width - 8, 16, or 32 | |
710 | * Value - Where the value is returned | |
711 | * Reg - GAS register structure | |
712 | * | |
713 | * RETURN: Status | |
714 | * | |
715 | * DESCRIPTION: Read from either memory or IO space. | |
716 | * | |
717 | ******************************************************************************/ | |
718 | ||
719 | acpi_status | |
4be44fcd | 720 | acpi_hw_low_level_read(u32 width, u32 * value, struct acpi_generic_address *reg) |
1da177e4 | 721 | { |
4be44fcd LB |
722 | u64 address; |
723 | acpi_status status; | |
1da177e4 | 724 | |
4be44fcd | 725 | ACPI_FUNCTION_NAME("hw_low_level_read"); |
1da177e4 LT |
726 | |
727 | /* | |
728 | * Must have a valid pointer to a GAS structure, and | |
729 | * a non-zero address within. However, don't return an error | |
730 | * because the PM1A/B code must not fail if B isn't present. | |
731 | */ | |
732 | if (!reg) { | |
733 | return (AE_OK); | |
734 | } | |
735 | ||
736 | /* Get a local copy of the address. Handles possible alignment issues */ | |
737 | ||
4be44fcd | 738 | ACPI_MOVE_64_TO_64(&address, ®->address); |
1da177e4 LT |
739 | if (!address) { |
740 | return (AE_OK); | |
741 | } | |
742 | *value = 0; | |
743 | ||
744 | /* | |
745 | * Two address spaces supported: Memory or IO. | |
746 | * PCI_Config is not supported here because the GAS struct is insufficient | |
747 | */ | |
748 | switch (reg->address_space_id) { | |
749 | case ACPI_ADR_SPACE_SYSTEM_MEMORY: | |
750 | ||
4be44fcd LB |
751 | status = acpi_os_read_memory((acpi_physical_address) address, |
752 | value, width); | |
1da177e4 LT |
753 | break; |
754 | ||
1da177e4 LT |
755 | case ACPI_ADR_SPACE_SYSTEM_IO: |
756 | ||
4be44fcd LB |
757 | status = acpi_os_read_port((acpi_io_address) address, |
758 | value, width); | |
1da177e4 LT |
759 | break; |
760 | ||
1da177e4 | 761 | default: |
4a90c7e8 BM |
762 | ACPI_REPORT_ERROR(("Unsupported address space: %X\n", |
763 | reg->address_space_id)); | |
1da177e4 LT |
764 | return (AE_BAD_PARAMETER); |
765 | } | |
766 | ||
4be44fcd LB |
767 | ACPI_DEBUG_PRINT((ACPI_DB_IO, |
768 | "Read: %8.8X width %2d from %8.8X%8.8X (%s)\n", | |
769 | *value, width, | |
770 | ACPI_FORMAT_UINT64(address), | |
771 | acpi_ut_get_region_name(reg->address_space_id))); | |
1da177e4 LT |
772 | |
773 | return (status); | |
774 | } | |
775 | ||
1da177e4 LT |
776 | /****************************************************************************** |
777 | * | |
778 | * FUNCTION: acpi_hw_low_level_write | |
779 | * | |
780 | * PARAMETERS: Width - 8, 16, or 32 | |
781 | * Value - To be written | |
782 | * Reg - GAS register structure | |
783 | * | |
784 | * RETURN: Status | |
785 | * | |
786 | * DESCRIPTION: Write to either memory or IO space. | |
787 | * | |
788 | ******************************************************************************/ | |
789 | ||
790 | acpi_status | |
4be44fcd | 791 | acpi_hw_low_level_write(u32 width, u32 value, struct acpi_generic_address * reg) |
1da177e4 | 792 | { |
4be44fcd LB |
793 | u64 address; |
794 | acpi_status status; | |
1da177e4 | 795 | |
4be44fcd | 796 | ACPI_FUNCTION_NAME("hw_low_level_write"); |
1da177e4 LT |
797 | |
798 | /* | |
799 | * Must have a valid pointer to a GAS structure, and | |
800 | * a non-zero address within. However, don't return an error | |
801 | * because the PM1A/B code must not fail if B isn't present. | |
802 | */ | |
803 | if (!reg) { | |
804 | return (AE_OK); | |
805 | } | |
806 | ||
807 | /* Get a local copy of the address. Handles possible alignment issues */ | |
808 | ||
4be44fcd | 809 | ACPI_MOVE_64_TO_64(&address, ®->address); |
1da177e4 LT |
810 | if (!address) { |
811 | return (AE_OK); | |
812 | } | |
813 | ||
814 | /* | |
815 | * Two address spaces supported: Memory or IO. | |
816 | * PCI_Config is not supported here because the GAS struct is insufficient | |
817 | */ | |
818 | switch (reg->address_space_id) { | |
819 | case ACPI_ADR_SPACE_SYSTEM_MEMORY: | |
820 | ||
4be44fcd LB |
821 | status = acpi_os_write_memory((acpi_physical_address) address, |
822 | value, width); | |
1da177e4 LT |
823 | break; |
824 | ||
1da177e4 LT |
825 | case ACPI_ADR_SPACE_SYSTEM_IO: |
826 | ||
4be44fcd LB |
827 | status = acpi_os_write_port((acpi_io_address) address, |
828 | value, width); | |
1da177e4 LT |
829 | break; |
830 | ||
1da177e4 | 831 | default: |
4a90c7e8 BM |
832 | ACPI_REPORT_ERROR(("Unsupported address space: %X\n", |
833 | reg->address_space_id)); | |
1da177e4 LT |
834 | return (AE_BAD_PARAMETER); |
835 | } | |
836 | ||
4be44fcd LB |
837 | ACPI_DEBUG_PRINT((ACPI_DB_IO, |
838 | "Wrote: %8.8X width %2d to %8.8X%8.8X (%s)\n", | |
839 | value, width, | |
840 | ACPI_FORMAT_UINT64(address), | |
841 | acpi_ut_get_region_name(reg->address_space_id))); | |
1da177e4 LT |
842 | |
843 | return (status); | |
844 | } |