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1
2/******************************************************************************
3 *
4 * Module Name: hwxface - Public ACPICA hardware interfaces
5 *
6 *****************************************************************************/
7
8/*
9 * Copyright (C) 2000 - 2012, 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 <linux/export.h>
46#include <acpi/acpi.h>
47#include "accommon.h"
48#include "acnamesp.h"
49
50#define _COMPONENT ACPI_HARDWARE
51ACPI_MODULE_NAME("hwxface")
52
53/******************************************************************************
54 *
55 * FUNCTION: acpi_reset
56 *
57 * PARAMETERS: None
58 *
59 * RETURN: Status
60 *
61 * DESCRIPTION: Set reset register in memory or IO space. Note: Does not
62 * support reset register in PCI config space, this must be
63 * handled separately.
64 *
65 ******************************************************************************/
66acpi_status acpi_reset(void)
67{
68 struct acpi_generic_address *reset_reg;
69 acpi_status status;
70
71 ACPI_FUNCTION_TRACE(acpi_reset);
72
73 reset_reg = &acpi_gbl_FADT.reset_register;
74
75 /* Check if the reset register is supported */
76
77 if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) ||
78 !reset_reg->address) {
79 return_ACPI_STATUS(AE_NOT_EXIST);
80 }
81
82 if (reset_reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
83 /*
84 * For I/O space, write directly to the OSL. This
85 * bypasses the port validation mechanism, which may
86 * block a valid write to the reset register. Spec
87 * section 4.7.3.6 requires register width to be 8.
88 */
89 status =
90 acpi_os_write_port((acpi_io_address) reset_reg->address,
91 acpi_gbl_FADT.reset_value, 8);
92 } else {
93 /* Write the reset value to the reset register */
94
95 status = acpi_hw_write(acpi_gbl_FADT.reset_value, reset_reg);
96 }
97
98 return_ACPI_STATUS(status);
99}
100
101ACPI_EXPORT_SYMBOL(acpi_reset)
102
103/******************************************************************************
104 *
105 * FUNCTION: acpi_read
106 *
107 * PARAMETERS: Value - Where the value is returned
108 * Reg - GAS register structure
109 *
110 * RETURN: Status
111 *
112 * DESCRIPTION: Read from either memory or IO space.
113 *
114 * LIMITATIONS: <These limitations also apply to acpi_write>
115 * bit_width must be exactly 8, 16, 32, or 64.
116 * space_iD must be system_memory or system_iO.
117 * bit_offset and access_width are currently ignored, as there has
118 * not been a need to implement these.
119 *
120 ******************************************************************************/
121acpi_status acpi_read(u64 *return_value, struct acpi_generic_address *reg)
122{
123 u32 value;
124 u32 width;
125 u64 address;
126 acpi_status status;
127
128 ACPI_FUNCTION_NAME(acpi_read);
129
130 if (!return_value) {
131 return (AE_BAD_PARAMETER);
132 }
133
134 /* Validate contents of the GAS register. Allow 64-bit transfers */
135
136 status = acpi_hw_validate_register(reg, 64, &address);
137 if (ACPI_FAILURE(status)) {
138 return (status);
139 }
140
141 /* Initialize entire 64-bit return value to zero */
142
143 *return_value = 0;
144 value = 0;
145
146 /*
147 * Two address spaces supported: Memory or IO. PCI_Config is
148 * not supported here because the GAS structure is insufficient
149 */
150 if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
151 status = acpi_os_read_memory((acpi_physical_address)
152 address, return_value,
153 reg->bit_width);
154 if (ACPI_FAILURE(status)) {
155 return (status);
156 }
157 } else { /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */
158
159 width = reg->bit_width;
160 if (width == 64) {
161 width = 32; /* Break into two 32-bit transfers */
162 }
163
164 status = acpi_hw_read_port((acpi_io_address)
165 address, &value, width);
166 if (ACPI_FAILURE(status)) {
167 return (status);
168 }
169 *return_value = value;
170
171 if (reg->bit_width == 64) {
172
173 /* Read the top 32 bits */
174
175 status = acpi_hw_read_port((acpi_io_address)
176 (address + 4), &value, 32);
177 if (ACPI_FAILURE(status)) {
178 return (status);
179 }
180 *return_value |= ((u64)value << 32);
181 }
182 }
183
184 ACPI_DEBUG_PRINT((ACPI_DB_IO,
185 "Read: %8.8X%8.8X width %2d from %8.8X%8.8X (%s)\n",
186 ACPI_FORMAT_UINT64(*return_value), reg->bit_width,
187 ACPI_FORMAT_UINT64(address),
188 acpi_ut_get_region_name(reg->space_id)));
189
190 return (status);
191}
192
193ACPI_EXPORT_SYMBOL(acpi_read)
194
195/******************************************************************************
196 *
197 * FUNCTION: acpi_write
198 *
199 * PARAMETERS: Value - Value to be written
200 * Reg - GAS register structure
201 *
202 * RETURN: Status
203 *
204 * DESCRIPTION: Write to either memory or IO space.
205 *
206 ******************************************************************************/
207acpi_status acpi_write(u64 value, struct acpi_generic_address *reg)
208{
209 u32 width;
210 u64 address;
211 acpi_status status;
212
213 ACPI_FUNCTION_NAME(acpi_write);
214
215 /* Validate contents of the GAS register. Allow 64-bit transfers */
216
217 status = acpi_hw_validate_register(reg, 64, &address);
218 if (ACPI_FAILURE(status)) {
219 return (status);
220 }
221
222 /*
223 * Two address spaces supported: Memory or IO. PCI_Config is
224 * not supported here because the GAS structure is insufficient
225 */
226 if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
227 status = acpi_os_write_memory((acpi_physical_address)
228 address, value, reg->bit_width);
229 if (ACPI_FAILURE(status)) {
230 return (status);
231 }
232 } else { /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */
233
234 width = reg->bit_width;
235 if (width == 64) {
236 width = 32; /* Break into two 32-bit transfers */
237 }
238
239 status = acpi_hw_write_port((acpi_io_address)
240 address, ACPI_LODWORD(value),
241 width);
242 if (ACPI_FAILURE(status)) {
243 return (status);
244 }
245
246 if (reg->bit_width == 64) {
247 status = acpi_hw_write_port((acpi_io_address)
248 (address + 4),
249 ACPI_HIDWORD(value), 32);
250 if (ACPI_FAILURE(status)) {
251 return (status);
252 }
253 }
254 }
255
256 ACPI_DEBUG_PRINT((ACPI_DB_IO,
257 "Wrote: %8.8X%8.8X width %2d to %8.8X%8.8X (%s)\n",
258 ACPI_FORMAT_UINT64(value), reg->bit_width,
259 ACPI_FORMAT_UINT64(address),
260 acpi_ut_get_region_name(reg->space_id)));
261
262 return (status);
263}
264
265ACPI_EXPORT_SYMBOL(acpi_write)
266
267#if (!ACPI_REDUCED_HARDWARE)
268/*******************************************************************************
269 *
270 * FUNCTION: acpi_read_bit_register
271 *
272 * PARAMETERS: register_id - ID of ACPI Bit Register to access
273 * return_value - Value that was read from the register,
274 * normalized to bit position zero.
275 *
276 * RETURN: Status and the value read from the specified Register. Value
277 * returned is normalized to bit0 (is shifted all the way right)
278 *
279 * DESCRIPTION: ACPI bit_register read function. Does not acquire the HW lock.
280 *
281 * SUPPORTS: Bit fields in PM1 Status, PM1 Enable, PM1 Control, and
282 * PM2 Control.
283 *
284 * Note: The hardware lock is not required when reading the ACPI bit registers
285 * since almost all of them are single bit and it does not matter that
286 * the parent hardware register can be split across two physical
287 * registers. The only multi-bit field is SLP_TYP in the PM1 control
288 * register, but this field does not cross an 8-bit boundary (nor does
289 * it make much sense to actually read this field.)
290 *
291 ******************************************************************************/
292acpi_status acpi_read_bit_register(u32 register_id, u32 *return_value)
293{
294 struct acpi_bit_register_info *bit_reg_info;
295 u32 register_value;
296 u32 value;
297 acpi_status status;
298
299 ACPI_FUNCTION_TRACE_U32(acpi_read_bit_register, register_id);
300
301 /* Get the info structure corresponding to the requested ACPI Register */
302
303 bit_reg_info = acpi_hw_get_bit_register_info(register_id);
304 if (!bit_reg_info) {
305 return_ACPI_STATUS(AE_BAD_PARAMETER);
306 }
307
308 /* Read the entire parent register */
309
310 status = acpi_hw_register_read(bit_reg_info->parent_register,
311 ®ister_value);
312 if (ACPI_FAILURE(status)) {
313 return_ACPI_STATUS(status);
314 }
315
316 /* Normalize the value that was read, mask off other bits */
317
318 value = ((register_value & bit_reg_info->access_bit_mask)
319 >> bit_reg_info->bit_position);
320
321 ACPI_DEBUG_PRINT((ACPI_DB_IO,
322 "BitReg %X, ParentReg %X, Actual %8.8X, ReturnValue %8.8X\n",
323 register_id, bit_reg_info->parent_register,
324 register_value, value));
325
326 *return_value = value;
327 return_ACPI_STATUS(AE_OK);
328}
329
330ACPI_EXPORT_SYMBOL(acpi_read_bit_register)
331
332/*******************************************************************************
333 *
334 * FUNCTION: acpi_write_bit_register
335 *
336 * PARAMETERS: register_id - ID of ACPI Bit Register to access
337 * Value - Value to write to the register, in bit
338 * position zero. The bit is automatically
339 * shifted to the correct position.
340 *
341 * RETURN: Status
342 *
343 * DESCRIPTION: ACPI Bit Register write function. Acquires the hardware lock
344 * since most operations require a read/modify/write sequence.
345 *
346 * SUPPORTS: Bit fields in PM1 Status, PM1 Enable, PM1 Control, and
347 * PM2 Control.
348 *
349 * Note that at this level, the fact that there may be actually two
350 * hardware registers (A and B - and B may not exist) is abstracted.
351 *
352 ******************************************************************************/
353acpi_status acpi_write_bit_register(u32 register_id, u32 value)
354{
355 struct acpi_bit_register_info *bit_reg_info;
356 acpi_cpu_flags lock_flags;
357 u32 register_value;
358 acpi_status status = AE_OK;
359
360 ACPI_FUNCTION_TRACE_U32(acpi_write_bit_register, register_id);
361
362 /* Get the info structure corresponding to the requested ACPI Register */
363
364 bit_reg_info = acpi_hw_get_bit_register_info(register_id);
365 if (!bit_reg_info) {
366 return_ACPI_STATUS(AE_BAD_PARAMETER);
367 }
368
369 lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
370
371 /*
372 * At this point, we know that the parent register is one of the
373 * following: PM1 Status, PM1 Enable, PM1 Control, or PM2 Control
374 */
375 if (bit_reg_info->parent_register != ACPI_REGISTER_PM1_STATUS) {
376 /*
377 * 1) Case for PM1 Enable, PM1 Control, and PM2 Control
378 *
379 * Perform a register read to preserve the bits that we are not
380 * interested in
381 */
382 status = acpi_hw_register_read(bit_reg_info->parent_register,
383 ®ister_value);
384 if (ACPI_FAILURE(status)) {
385 goto unlock_and_exit;
386 }
387
388 /*
389 * Insert the input bit into the value that was just read
390 * and write the register
391 */
392 ACPI_REGISTER_INSERT_VALUE(register_value,
393 bit_reg_info->bit_position,
394 bit_reg_info->access_bit_mask,
395 value);
396
397 status = acpi_hw_register_write(bit_reg_info->parent_register,
398 register_value);
399 } else {
400 /*
401 * 2) Case for PM1 Status
402 *
403 * The Status register is different from the rest. Clear an event
404 * by writing 1, writing 0 has no effect. So, the only relevant
405 * information is the single bit we're interested in, all others
406 * should be written as 0 so they will be left unchanged.
407 */
408 register_value = ACPI_REGISTER_PREPARE_BITS(value,
409 bit_reg_info->
410 bit_position,
411 bit_reg_info->
412 access_bit_mask);
413
414 /* No need to write the register if value is all zeros */
415
416 if (register_value) {
417 status =
418 acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS,
419 register_value);
420 }
421 }
422
423 ACPI_DEBUG_PRINT((ACPI_DB_IO,
424 "BitReg %X, ParentReg %X, Value %8.8X, Actual %8.8X\n",
425 register_id, bit_reg_info->parent_register, value,
426 register_value));
427
428unlock_and_exit:
429
430 acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
431 return_ACPI_STATUS(status);
432}
433
434ACPI_EXPORT_SYMBOL(acpi_write_bit_register)
435#endif /* !ACPI_REDUCED_HARDWARE */
436/*******************************************************************************
437 *
438 * FUNCTION: acpi_get_sleep_type_data
439 *
440 * PARAMETERS: sleep_state - Numeric sleep state
441 * *sleep_type_a - Where SLP_TYPa is returned
442 * *sleep_type_b - Where SLP_TYPb is returned
443 *
444 * RETURN: Status - ACPI status
445 *
446 * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested sleep
447 * state.
448 *
449 ******************************************************************************/
450acpi_status
451acpi_get_sleep_type_data(u8 sleep_state, u8 *sleep_type_a, u8 *sleep_type_b)
452{
453 acpi_status status = AE_OK;
454 struct acpi_evaluate_info *info;
455
456 ACPI_FUNCTION_TRACE(acpi_get_sleep_type_data);
457
458 /* Validate parameters */
459
460 if ((sleep_state > ACPI_S_STATES_MAX) || !sleep_type_a || !sleep_type_b) {
461 return_ACPI_STATUS(AE_BAD_PARAMETER);
462 }
463
464 /* Allocate the evaluation information block */
465
466 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
467 if (!info) {
468 return_ACPI_STATUS(AE_NO_MEMORY);
469 }
470
471 info->pathname =
472 ACPI_CAST_PTR(char, acpi_gbl_sleep_state_names[sleep_state]);
473
474 /* Evaluate the namespace object containing the values for this state */
475
476 status = acpi_ns_evaluate(info);
477 if (ACPI_FAILURE(status)) {
478 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
479 "%s while evaluating SleepState [%s]\n",
480 acpi_format_exception(status),
481 info->pathname));
482
483 goto cleanup;
484 }
485
486 /* Must have a return object */
487
488 if (!info->return_object) {
489 ACPI_ERROR((AE_INFO, "No Sleep State object returned from [%s]",
490 info->pathname));
491 status = AE_NOT_EXIST;
492 }
493
494 /* It must be of type Package */
495
496 else if (info->return_object->common.type != ACPI_TYPE_PACKAGE) {
497 ACPI_ERROR((AE_INFO,
498 "Sleep State return object is not a Package"));
499 status = AE_AML_OPERAND_TYPE;
500 }
501
502 /*
503 * The package must have at least two elements. NOTE (March 2005): This
504 * goes against the current ACPI spec which defines this object as a
505 * package with one encoded DWORD element. However, existing practice
506 * by BIOS vendors seems to be to have 2 or more elements, at least
507 * one per sleep type (A/B).
508 */
509 else if (info->return_object->package.count < 2) {
510 ACPI_ERROR((AE_INFO,
511 "Sleep State return package does not have at least two elements"));
512 status = AE_AML_NO_OPERAND;
513 }
514
515 /* The first two elements must both be of type Integer */
516
517 else if (((info->return_object->package.elements[0])->common.type
518 != ACPI_TYPE_INTEGER) ||
519 ((info->return_object->package.elements[1])->common.type
520 != ACPI_TYPE_INTEGER)) {
521 ACPI_ERROR((AE_INFO,
522 "Sleep State return package elements are not both Integers "
523 "(%s, %s)",
524 acpi_ut_get_object_type_name(info->return_object->
525 package.elements[0]),
526 acpi_ut_get_object_type_name(info->return_object->
527 package.elements[1])));
528 status = AE_AML_OPERAND_TYPE;
529 } else {
530 /* Valid _Sx_ package size, type, and value */
531
532 *sleep_type_a = (u8)
533 (info->return_object->package.elements[0])->integer.value;
534 *sleep_type_b = (u8)
535 (info->return_object->package.elements[1])->integer.value;
536 }
537
538 if (ACPI_FAILURE(status)) {
539 ACPI_EXCEPTION((AE_INFO, status,
540 "While evaluating SleepState [%s], bad Sleep object %p type %s",
541 info->pathname, info->return_object,
542 acpi_ut_get_object_type_name(info->
543 return_object)));
544 }
545
546 acpi_ut_remove_reference(info->return_object);
547
548 cleanup:
549 ACPI_FREE(info);
550 return_ACPI_STATUS(status);
551}
552
553ACPI_EXPORT_SYMBOL(acpi_get_sleep_type_data)
1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2/******************************************************************************
3 *
4 * Module Name: hwxface - Public ACPICA hardware interfaces
5 *
6 * Copyright (C) 2000 - 2018, Intel Corp.
7 *
8 *****************************************************************************/
9
10#define EXPORT_ACPI_INTERFACES
11
12#include <acpi/acpi.h>
13#include "accommon.h"
14#include "acnamesp.h"
15
16#define _COMPONENT ACPI_HARDWARE
17ACPI_MODULE_NAME("hwxface")
18
19/******************************************************************************
20 *
21 * FUNCTION: acpi_reset
22 *
23 * PARAMETERS: None
24 *
25 * RETURN: Status
26 *
27 * DESCRIPTION: Set reset register in memory or IO space. Note: Does not
28 * support reset register in PCI config space, this must be
29 * handled separately.
30 *
31 ******************************************************************************/
32acpi_status acpi_reset(void)
33{
34 struct acpi_generic_address *reset_reg;
35 acpi_status status;
36
37 ACPI_FUNCTION_TRACE(acpi_reset);
38
39 reset_reg = &acpi_gbl_FADT.reset_register;
40
41 /* Check if the reset register is supported */
42
43 if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) ||
44 !reset_reg->address) {
45 return_ACPI_STATUS(AE_NOT_EXIST);
46 }
47
48 if (reset_reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
49 /*
50 * For I/O space, write directly to the OSL. This bypasses the port
51 * validation mechanism, which may block a valid write to the reset
52 * register.
53 *
54 * NOTE:
55 * The ACPI spec requires the reset register width to be 8, so we
56 * hardcode it here and ignore the FADT value. This maintains
57 * compatibility with other ACPI implementations that have allowed
58 * BIOS code with bad register width values to go unnoticed.
59 */
60 status = acpi_os_write_port((acpi_io_address)reset_reg->address,
61 acpi_gbl_FADT.reset_value,
62 ACPI_RESET_REGISTER_WIDTH);
63 } else {
64 /* Write the reset value to the reset register */
65
66 status = acpi_hw_write(acpi_gbl_FADT.reset_value, reset_reg);
67 }
68
69 return_ACPI_STATUS(status);
70}
71
72ACPI_EXPORT_SYMBOL(acpi_reset)
73
74/******************************************************************************
75 *
76 * FUNCTION: acpi_read
77 *
78 * PARAMETERS: value - Where the value is returned
79 * reg - GAS register structure
80 *
81 * RETURN: Status
82 *
83 * DESCRIPTION: Read from either memory or IO space.
84 *
85 * LIMITATIONS: <These limitations also apply to acpi_write>
86 * bit_width must be exactly 8, 16, 32, or 64.
87 * space_ID must be system_memory or system_IO.
88 * bit_offset and access_width are currently ignored, as there has
89 * not been a need to implement these.
90 *
91 ******************************************************************************/
92acpi_status acpi_read(u64 *return_value, struct acpi_generic_address *reg)
93{
94 acpi_status status;
95
96 ACPI_FUNCTION_NAME(acpi_read);
97
98 status = acpi_hw_read(return_value, reg);
99 return (status);
100}
101
102ACPI_EXPORT_SYMBOL(acpi_read)
103
104/******************************************************************************
105 *
106 * FUNCTION: acpi_write
107 *
108 * PARAMETERS: value - Value to be written
109 * reg - GAS register structure
110 *
111 * RETURN: Status
112 *
113 * DESCRIPTION: Write to either memory or IO space.
114 *
115 ******************************************************************************/
116acpi_status acpi_write(u64 value, struct acpi_generic_address *reg)
117{
118 acpi_status status;
119
120 ACPI_FUNCTION_NAME(acpi_write);
121
122 status = acpi_hw_write(value, reg);
123 return (status);
124}
125
126ACPI_EXPORT_SYMBOL(acpi_write)
127
128#if (!ACPI_REDUCED_HARDWARE)
129/*******************************************************************************
130 *
131 * FUNCTION: acpi_read_bit_register
132 *
133 * PARAMETERS: register_id - ID of ACPI Bit Register to access
134 * return_value - Value that was read from the register,
135 * normalized to bit position zero.
136 *
137 * RETURN: Status and the value read from the specified Register. Value
138 * returned is normalized to bit0 (is shifted all the way right)
139 *
140 * DESCRIPTION: ACPI bit_register read function. Does not acquire the HW lock.
141 *
142 * SUPPORTS: Bit fields in PM1 Status, PM1 Enable, PM1 Control, and
143 * PM2 Control.
144 *
145 * Note: The hardware lock is not required when reading the ACPI bit registers
146 * since almost all of them are single bit and it does not matter that
147 * the parent hardware register can be split across two physical
148 * registers. The only multi-bit field is SLP_TYP in the PM1 control
149 * register, but this field does not cross an 8-bit boundary (nor does
150 * it make much sense to actually read this field.)
151 *
152 ******************************************************************************/
153acpi_status acpi_read_bit_register(u32 register_id, u32 *return_value)
154{
155 struct acpi_bit_register_info *bit_reg_info;
156 u32 register_value;
157 u32 value;
158 acpi_status status;
159
160 ACPI_FUNCTION_TRACE_U32(acpi_read_bit_register, register_id);
161
162 /* Get the info structure corresponding to the requested ACPI Register */
163
164 bit_reg_info = acpi_hw_get_bit_register_info(register_id);
165 if (!bit_reg_info) {
166 return_ACPI_STATUS(AE_BAD_PARAMETER);
167 }
168
169 /* Read the entire parent register */
170
171 status = acpi_hw_register_read(bit_reg_info->parent_register,
172 ®ister_value);
173 if (ACPI_FAILURE(status)) {
174 return_ACPI_STATUS(status);
175 }
176
177 /* Normalize the value that was read, mask off other bits */
178
179 value = ((register_value & bit_reg_info->access_bit_mask)
180 >> bit_reg_info->bit_position);
181
182 ACPI_DEBUG_PRINT((ACPI_DB_IO,
183 "BitReg %X, ParentReg %X, Actual %8.8X, ReturnValue %8.8X\n",
184 register_id, bit_reg_info->parent_register,
185 register_value, value));
186
187 *return_value = value;
188 return_ACPI_STATUS(AE_OK);
189}
190
191ACPI_EXPORT_SYMBOL(acpi_read_bit_register)
192
193/*******************************************************************************
194 *
195 * FUNCTION: acpi_write_bit_register
196 *
197 * PARAMETERS: register_id - ID of ACPI Bit Register to access
198 * value - Value to write to the register, in bit
199 * position zero. The bit is automatically
200 * shifted to the correct position.
201 *
202 * RETURN: Status
203 *
204 * DESCRIPTION: ACPI Bit Register write function. Acquires the hardware lock
205 * since most operations require a read/modify/write sequence.
206 *
207 * SUPPORTS: Bit fields in PM1 Status, PM1 Enable, PM1 Control, and
208 * PM2 Control.
209 *
210 * Note that at this level, the fact that there may be actually two
211 * hardware registers (A and B - and B may not exist) is abstracted.
212 *
213 ******************************************************************************/
214acpi_status acpi_write_bit_register(u32 register_id, u32 value)
215{
216 struct acpi_bit_register_info *bit_reg_info;
217 acpi_cpu_flags lock_flags;
218 u32 register_value;
219 acpi_status status = AE_OK;
220
221 ACPI_FUNCTION_TRACE_U32(acpi_write_bit_register, register_id);
222
223 /* Get the info structure corresponding to the requested ACPI Register */
224
225 bit_reg_info = acpi_hw_get_bit_register_info(register_id);
226 if (!bit_reg_info) {
227 return_ACPI_STATUS(AE_BAD_PARAMETER);
228 }
229
230 lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
231
232 /*
233 * At this point, we know that the parent register is one of the
234 * following: PM1 Status, PM1 Enable, PM1 Control, or PM2 Control
235 */
236 if (bit_reg_info->parent_register != ACPI_REGISTER_PM1_STATUS) {
237 /*
238 * 1) Case for PM1 Enable, PM1 Control, and PM2 Control
239 *
240 * Perform a register read to preserve the bits that we are not
241 * interested in
242 */
243 status = acpi_hw_register_read(bit_reg_info->parent_register,
244 ®ister_value);
245 if (ACPI_FAILURE(status)) {
246 goto unlock_and_exit;
247 }
248
249 /*
250 * Insert the input bit into the value that was just read
251 * and write the register
252 */
253 ACPI_REGISTER_INSERT_VALUE(register_value,
254 bit_reg_info->bit_position,
255 bit_reg_info->access_bit_mask,
256 value);
257
258 status = acpi_hw_register_write(bit_reg_info->parent_register,
259 register_value);
260 } else {
261 /*
262 * 2) Case for PM1 Status
263 *
264 * The Status register is different from the rest. Clear an event
265 * by writing 1, writing 0 has no effect. So, the only relevant
266 * information is the single bit we're interested in, all others
267 * should be written as 0 so they will be left unchanged.
268 */
269 register_value = ACPI_REGISTER_PREPARE_BITS(value,
270 bit_reg_info->
271 bit_position,
272 bit_reg_info->
273 access_bit_mask);
274
275 /* No need to write the register if value is all zeros */
276
277 if (register_value) {
278 status =
279 acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS,
280 register_value);
281 }
282 }
283
284 ACPI_DEBUG_PRINT((ACPI_DB_IO,
285 "BitReg %X, ParentReg %X, Value %8.8X, Actual %8.8X\n",
286 register_id, bit_reg_info->parent_register, value,
287 register_value));
288
289unlock_and_exit:
290
291 acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
292 return_ACPI_STATUS(status);
293}
294
295ACPI_EXPORT_SYMBOL(acpi_write_bit_register)
296#endif /* !ACPI_REDUCED_HARDWARE */
297/*******************************************************************************
298 *
299 * FUNCTION: acpi_get_sleep_type_data
300 *
301 * PARAMETERS: sleep_state - Numeric sleep state
302 * *sleep_type_a - Where SLP_TYPa is returned
303 * *sleep_type_b - Where SLP_TYPb is returned
304 *
305 * RETURN: Status
306 *
307 * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested
308 * sleep state via the appropriate \_Sx object.
309 *
310 * The sleep state package returned from the corresponding \_Sx_ object
311 * must contain at least one integer.
312 *
313 * March 2005:
314 * Added support for a package that contains two integers. This
315 * goes against the ACPI specification which defines this object as a
316 * package with one encoded DWORD integer. However, existing practice
317 * by many BIOS vendors is to return a package with 2 or more integer
318 * elements, at least one per sleep type (A/B).
319 *
320 * January 2013:
321 * Therefore, we must be prepared to accept a package with either a
322 * single integer or multiple integers.
323 *
324 * The single integer DWORD format is as follows:
325 * BYTE 0 - Value for the PM1A SLP_TYP register
326 * BYTE 1 - Value for the PM1B SLP_TYP register
327 * BYTE 2-3 - Reserved
328 *
329 * The dual integer format is as follows:
330 * Integer 0 - Value for the PM1A SLP_TYP register
331 * Integer 1 - Value for the PM1A SLP_TYP register
332 *
333 ******************************************************************************/
334acpi_status
335acpi_get_sleep_type_data(u8 sleep_state, u8 *sleep_type_a, u8 *sleep_type_b)
336{
337 acpi_status status;
338 struct acpi_evaluate_info *info;
339 union acpi_operand_object **elements;
340
341 ACPI_FUNCTION_TRACE(acpi_get_sleep_type_data);
342
343 /* Validate parameters */
344
345 if ((sleep_state > ACPI_S_STATES_MAX) || !sleep_type_a || !sleep_type_b) {
346 return_ACPI_STATUS(AE_BAD_PARAMETER);
347 }
348
349 /* Allocate the evaluation information block */
350
351 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
352 if (!info) {
353 return_ACPI_STATUS(AE_NO_MEMORY);
354 }
355
356 /*
357 * Evaluate the \_Sx namespace object containing the register values
358 * for this state
359 */
360 info->relative_pathname = acpi_gbl_sleep_state_names[sleep_state];
361
362 status = acpi_ns_evaluate(info);
363 if (ACPI_FAILURE(status)) {
364 if (status == AE_NOT_FOUND) {
365
366 /* The _Sx states are optional, ignore NOT_FOUND */
367
368 goto final_cleanup;
369 }
370
371 goto warning_cleanup;
372 }
373
374 /* Must have a return object */
375
376 if (!info->return_object) {
377 ACPI_ERROR((AE_INFO, "No Sleep State object returned from [%s]",
378 info->relative_pathname));
379 status = AE_AML_NO_RETURN_VALUE;
380 goto warning_cleanup;
381 }
382
383 /* Return object must be of type Package */
384
385 if (info->return_object->common.type != ACPI_TYPE_PACKAGE) {
386 ACPI_ERROR((AE_INFO,
387 "Sleep State return object is not a Package"));
388 status = AE_AML_OPERAND_TYPE;
389 goto return_value_cleanup;
390 }
391
392 /*
393 * Any warnings about the package length or the object types have
394 * already been issued by the predefined name module -- there is no
395 * need to repeat them here.
396 */
397 elements = info->return_object->package.elements;
398 switch (info->return_object->package.count) {
399 case 0:
400
401 status = AE_AML_PACKAGE_LIMIT;
402 break;
403
404 case 1:
405
406 if (elements[0]->common.type != ACPI_TYPE_INTEGER) {
407 status = AE_AML_OPERAND_TYPE;
408 break;
409 }
410
411 /* A valid _Sx_ package with one integer */
412
413 *sleep_type_a = (u8)elements[0]->integer.value;
414 *sleep_type_b = (u8)(elements[0]->integer.value >> 8);
415 break;
416
417 case 2:
418 default:
419
420 if ((elements[0]->common.type != ACPI_TYPE_INTEGER) ||
421 (elements[1]->common.type != ACPI_TYPE_INTEGER)) {
422 status = AE_AML_OPERAND_TYPE;
423 break;
424 }
425
426 /* A valid _Sx_ package with two integers */
427
428 *sleep_type_a = (u8)elements[0]->integer.value;
429 *sleep_type_b = (u8)elements[1]->integer.value;
430 break;
431 }
432
433return_value_cleanup:
434 acpi_ut_remove_reference(info->return_object);
435
436warning_cleanup:
437 if (ACPI_FAILURE(status)) {
438 ACPI_EXCEPTION((AE_INFO, status,
439 "While evaluating Sleep State [%s]",
440 info->relative_pathname));
441 }
442
443final_cleanup:
444 ACPI_FREE(info);
445 return_ACPI_STATUS(status);
446}
447
448ACPI_EXPORT_SYMBOL(acpi_get_sleep_type_data)