2 /*******************************************************************************
4 * Module Name: hwregs - Read/write access functions for the various ACPI
5 * control and status registers.
7 ******************************************************************************/
10 * Copyright (C) 2000 - 2006, R. Byron Moore
11 * All rights reserved.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
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.
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.
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.
46 #include <acpi/acpi.h>
47 #include <acpi/acnamesp.h>
48 #include <acpi/acevents.h>
50 #define _COMPONENT ACPI_HARDWARE
51 ACPI_MODULE_NAME("hwregs")
53 /*******************************************************************************
55 * FUNCTION: acpi_hw_clear_acpi_status
57 * PARAMETERS: Flags - Lock the hardware or not
61 * DESCRIPTION: Clears all fixed and general purpose status bits
62 * THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
64 ******************************************************************************/
65 acpi_status
acpi_hw_clear_acpi_status(u32 flags
)
69 ACPI_FUNCTION_TRACE(hw_clear_acpi_status
);
71 ACPI_DEBUG_PRINT((ACPI_DB_IO
, "About to write %04X to %04X\n",
72 ACPI_BITMASK_ALL_FIXED_STATUS
,
73 (u16
) acpi_gbl_FADT
->xpm1a_evt_blk
.address
));
75 if (flags
& ACPI_MTX_LOCK
) {
76 status
= acpi_ut_acquire_mutex(ACPI_MTX_HARDWARE
);
77 if (ACPI_FAILURE(status
)) {
78 return_ACPI_STATUS(status
);
82 status
= acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK
,
83 ACPI_REGISTER_PM1_STATUS
,
84 ACPI_BITMASK_ALL_FIXED_STATUS
);
85 if (ACPI_FAILURE(status
)) {
89 /* Clear the fixed events */
91 if (acpi_gbl_FADT
->xpm1b_evt_blk
.address
) {
93 acpi_hw_low_level_write(16, ACPI_BITMASK_ALL_FIXED_STATUS
,
94 &acpi_gbl_FADT
->xpm1b_evt_blk
);
95 if (ACPI_FAILURE(status
)) {
100 /* Clear the GPE Bits in all GPE registers in all GPE blocks */
102 status
= acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block
);
105 if (flags
& ACPI_MTX_LOCK
) {
106 (void)acpi_ut_release_mutex(ACPI_MTX_HARDWARE
);
108 return_ACPI_STATUS(status
);
111 /*******************************************************************************
113 * FUNCTION: acpi_get_sleep_type_data
115 * PARAMETERS: sleep_state - Numeric sleep state
116 * *sleep_type_a - Where SLP_TYPa is returned
117 * *sleep_type_b - Where SLP_TYPb is returned
119 * RETURN: Status - ACPI status
121 * DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested sleep
124 ******************************************************************************/
127 acpi_get_sleep_type_data(u8 sleep_state
, u8
* sleep_type_a
, u8
* sleep_type_b
)
129 acpi_status status
= AE_OK
;
130 struct acpi_parameter_info info
;
131 char *sleep_state_name
;
133 ACPI_FUNCTION_TRACE(acpi_get_sleep_type_data
);
135 /* Validate parameters */
137 if ((sleep_state
> ACPI_S_STATES_MAX
) || !sleep_type_a
|| !sleep_type_b
) {
138 return_ACPI_STATUS(AE_BAD_PARAMETER
);
141 /* Evaluate the namespace object containing the values for this state */
143 info
.parameters
= NULL
;
144 info
.return_object
= NULL
;
146 ACPI_CAST_PTR(char, acpi_gbl_sleep_state_names
[sleep_state
]);
148 status
= acpi_ns_evaluate_by_name(sleep_state_name
, &info
);
149 if (ACPI_FAILURE(status
)) {
150 ACPI_DEBUG_PRINT((ACPI_DB_EXEC
,
151 "%s while evaluating SleepState [%s]\n",
152 acpi_format_exception(status
),
155 return_ACPI_STATUS(status
);
158 /* Must have a return object */
160 if (!info
.return_object
) {
161 ACPI_ERROR((AE_INFO
, "No Sleep State object returned from [%s]",
163 status
= AE_NOT_EXIST
;
166 /* It must be of type Package */
168 else if (ACPI_GET_OBJECT_TYPE(info
.return_object
) != ACPI_TYPE_PACKAGE
) {
170 "Sleep State return object is not a Package"));
171 status
= AE_AML_OPERAND_TYPE
;
175 * The package must have at least two elements. NOTE (March 2005): This
176 * goes against the current ACPI spec which defines this object as a
177 * package with one encoded DWORD element. However, existing practice
178 * by BIOS vendors seems to be to have 2 or more elements, at least
179 * one per sleep type (A/B).
181 else if (info
.return_object
->package
.count
< 2) {
183 "Sleep State return package does not have at least two elements"));
184 status
= AE_AML_NO_OPERAND
;
187 /* The first two elements must both be of type Integer */
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
)) {
194 "Sleep State return package elements are not both Integers (%s, %s)",
195 acpi_ut_get_object_type_name(info
.return_object
->
196 package
.elements
[0]),
197 acpi_ut_get_object_type_name(info
.return_object
->
198 package
.elements
[1])));
199 status
= AE_AML_OPERAND_TYPE
;
201 /* Valid _Sx_ package size, type, and value */
204 (info
.return_object
->package
.elements
[0])->integer
.value
;
206 (info
.return_object
->package
.elements
[1])->integer
.value
;
209 if (ACPI_FAILURE(status
)) {
210 ACPI_EXCEPTION((AE_INFO
, status
,
211 "While evaluating SleepState [%s], bad Sleep object %p type %s",
212 sleep_state_name
, info
.return_object
,
213 acpi_ut_get_object_type_name(info
.
217 acpi_ut_remove_reference(info
.return_object
);
218 return_ACPI_STATUS(status
);
221 ACPI_EXPORT_SYMBOL(acpi_get_sleep_type_data
)
223 /*******************************************************************************
225 * FUNCTION: acpi_hw_get_register_bit_mask
227 * PARAMETERS: register_id - Index of ACPI Register to access
229 * RETURN: The bitmask to be used when accessing the register
231 * DESCRIPTION: Map register_id into a register bitmask.
233 ******************************************************************************/
234 struct acpi_bit_register_info
*acpi_hw_get_bit_register_info(u32 register_id
)
236 ACPI_FUNCTION_ENTRY();
238 if (register_id
> ACPI_BITREG_MAX
) {
239 ACPI_ERROR((AE_INFO
, "Invalid BitRegister ID: %X",
244 return (&acpi_gbl_bit_register_info
[register_id
]);
247 /*******************************************************************************
249 * FUNCTION: acpi_get_register
251 * PARAMETERS: register_id - ID of ACPI bit_register to access
252 * return_value - Value that was read from the register
253 * Flags - Lock the hardware or not
255 * RETURN: Status and the value read from specified Register. Value
256 * returned is normalized to bit0 (is shifted all the way right)
258 * DESCRIPTION: ACPI bit_register read function.
260 ******************************************************************************/
262 acpi_status
acpi_get_register(u32 register_id
, u32
* return_value
, u32 flags
)
264 u32 register_value
= 0;
265 struct acpi_bit_register_info
*bit_reg_info
;
268 ACPI_FUNCTION_TRACE(acpi_get_register
);
270 /* Get the info structure corresponding to the requested ACPI Register */
272 bit_reg_info
= acpi_hw_get_bit_register_info(register_id
);
274 return_ACPI_STATUS(AE_BAD_PARAMETER
);
277 if (flags
& ACPI_MTX_LOCK
) {
278 status
= acpi_ut_acquire_mutex(ACPI_MTX_HARDWARE
);
279 if (ACPI_FAILURE(status
)) {
280 return_ACPI_STATUS(status
);
284 /* Read from the register */
286 status
= acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK
,
287 bit_reg_info
->parent_register
,
290 if (flags
& ACPI_MTX_LOCK
) {
291 (void)acpi_ut_release_mutex(ACPI_MTX_HARDWARE
);
294 if (ACPI_SUCCESS(status
)) {
296 /* Normalize the value that was read */
299 ((register_value
& bit_reg_info
->access_bit_mask
)
300 >> bit_reg_info
->bit_position
);
302 *return_value
= register_value
;
304 ACPI_DEBUG_PRINT((ACPI_DB_IO
, "Read value %8.8X register %X\n",
306 bit_reg_info
->parent_register
));
309 return_ACPI_STATUS(status
);
312 ACPI_EXPORT_SYMBOL(acpi_get_register
)
314 /*******************************************************************************
316 * FUNCTION: acpi_set_register
318 * PARAMETERS: register_id - ID of ACPI bit_register to access
319 * Value - (only used on write) value to write to the
320 * Register, NOT pre-normalized to the bit pos
321 * Flags - Lock the hardware or not
325 * DESCRIPTION: ACPI Bit Register write function.
327 ******************************************************************************/
328 acpi_status
acpi_set_register(u32 register_id
, u32 value
, u32 flags
)
330 u32 register_value
= 0;
331 struct acpi_bit_register_info
*bit_reg_info
;
334 ACPI_FUNCTION_TRACE_U32(acpi_set_register
, register_id
);
336 /* Get the info structure corresponding to the requested ACPI Register */
338 bit_reg_info
= acpi_hw_get_bit_register_info(register_id
);
340 ACPI_ERROR((AE_INFO
, "Bad ACPI HW RegisterId: %X",
342 return_ACPI_STATUS(AE_BAD_PARAMETER
);
345 if (flags
& ACPI_MTX_LOCK
) {
346 status
= acpi_ut_acquire_mutex(ACPI_MTX_HARDWARE
);
347 if (ACPI_FAILURE(status
)) {
348 return_ACPI_STATUS(status
);
352 /* Always do a register read first so we can insert the new bits */
354 status
= acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK
,
355 bit_reg_info
->parent_register
,
357 if (ACPI_FAILURE(status
)) {
358 goto unlock_and_exit
;
362 * Decode the Register ID
363 * Register ID = [Register block ID] | [bit ID]
365 * Check bit ID to fine locate Register offset.
366 * Check Mask to determine Register offset, and then read-write.
368 switch (bit_reg_info
->parent_register
) {
369 case ACPI_REGISTER_PM1_STATUS
:
372 * Status Registers are different from the rest. Clear by
373 * writing 1, and writing 0 has no effect. So, the only relevant
374 * information is the single bit we're interested in, all others should
375 * be written as 0 so they will be left unchanged.
377 value
= ACPI_REGISTER_PREPARE_BITS(value
,
378 bit_reg_info
->bit_position
,
382 status
= acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK
,
383 ACPI_REGISTER_PM1_STATUS
,
389 case ACPI_REGISTER_PM1_ENABLE
:
391 ACPI_REGISTER_INSERT_VALUE(register_value
,
392 bit_reg_info
->bit_position
,
393 bit_reg_info
->access_bit_mask
,
396 status
= acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK
,
397 ACPI_REGISTER_PM1_ENABLE
,
398 (u16
) register_value
);
401 case ACPI_REGISTER_PM1_CONTROL
:
404 * Write the PM1 Control register.
405 * Note that at this level, the fact that there are actually TWO
406 * registers (A and B - and B may not exist) is abstracted.
408 ACPI_DEBUG_PRINT((ACPI_DB_IO
, "PM1 control: Read %X\n",
411 ACPI_REGISTER_INSERT_VALUE(register_value
,
412 bit_reg_info
->bit_position
,
413 bit_reg_info
->access_bit_mask
,
416 status
= acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK
,
417 ACPI_REGISTER_PM1_CONTROL
,
418 (u16
) register_value
);
421 case ACPI_REGISTER_PM2_CONTROL
:
423 status
= acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK
,
424 ACPI_REGISTER_PM2_CONTROL
,
426 if (ACPI_FAILURE(status
)) {
427 goto unlock_and_exit
;
430 ACPI_DEBUG_PRINT((ACPI_DB_IO
,
431 "PM2 control: Read %X from %8.8X%8.8X\n",
433 ACPI_FORMAT_UINT64(acpi_gbl_FADT
->
434 xpm2_cnt_blk
.address
)));
436 ACPI_REGISTER_INSERT_VALUE(register_value
,
437 bit_reg_info
->bit_position
,
438 bit_reg_info
->access_bit_mask
,
441 ACPI_DEBUG_PRINT((ACPI_DB_IO
,
442 "About to write %4.4X to %8.8X%8.8X\n",
444 ACPI_FORMAT_UINT64(acpi_gbl_FADT
->
445 xpm2_cnt_blk
.address
)));
447 status
= acpi_hw_register_write(ACPI_MTX_DO_NOT_LOCK
,
448 ACPI_REGISTER_PM2_CONTROL
,
449 (u8
) (register_value
));
458 if (flags
& ACPI_MTX_LOCK
) {
459 (void)acpi_ut_release_mutex(ACPI_MTX_HARDWARE
);
462 /* Normalize the value that was read */
464 ACPI_DEBUG_EXEC(register_value
=
465 ((register_value
& bit_reg_info
->access_bit_mask
) >>
466 bit_reg_info
->bit_position
));
468 ACPI_DEBUG_PRINT((ACPI_DB_IO
,
469 "Set bits: %8.8X actual %8.8X register %X\n", value
,
470 register_value
, bit_reg_info
->parent_register
));
471 return_ACPI_STATUS(status
);
474 ACPI_EXPORT_SYMBOL(acpi_set_register
)
476 /******************************************************************************
478 * FUNCTION: acpi_hw_register_read
480 * PARAMETERS: use_lock - Mutex hw access
481 * register_id - register_iD + Offset
482 * return_value - Where the register value is returned
484 * RETURN: Status and the value read.
486 * DESCRIPTION: Acpi register read function. Registers are read at the
489 ******************************************************************************/
491 acpi_hw_register_read(u8 use_lock
, u32 register_id
, u32
* return_value
)
497 ACPI_FUNCTION_TRACE(hw_register_read
);
499 if (ACPI_MTX_LOCK
== use_lock
) {
500 status
= acpi_ut_acquire_mutex(ACPI_MTX_HARDWARE
);
501 if (ACPI_FAILURE(status
)) {
502 return_ACPI_STATUS(status
);
506 switch (register_id
) {
507 case ACPI_REGISTER_PM1_STATUS
: /* 16-bit access */
510 acpi_hw_low_level_read(16, &value1
,
511 &acpi_gbl_FADT
->xpm1a_evt_blk
);
512 if (ACPI_FAILURE(status
)) {
513 goto unlock_and_exit
;
516 /* PM1B is optional */
519 acpi_hw_low_level_read(16, &value2
,
520 &acpi_gbl_FADT
->xpm1b_evt_blk
);
524 case ACPI_REGISTER_PM1_ENABLE
: /* 16-bit access */
527 acpi_hw_low_level_read(16, &value1
, &acpi_gbl_xpm1a_enable
);
528 if (ACPI_FAILURE(status
)) {
529 goto unlock_and_exit
;
532 /* PM1B is optional */
535 acpi_hw_low_level_read(16, &value2
, &acpi_gbl_xpm1b_enable
);
539 case ACPI_REGISTER_PM1_CONTROL
: /* 16-bit access */
542 acpi_hw_low_level_read(16, &value1
,
543 &acpi_gbl_FADT
->xpm1a_cnt_blk
);
544 if (ACPI_FAILURE(status
)) {
545 goto unlock_and_exit
;
549 acpi_hw_low_level_read(16, &value2
,
550 &acpi_gbl_FADT
->xpm1b_cnt_blk
);
554 case ACPI_REGISTER_PM2_CONTROL
: /* 8-bit access */
557 acpi_hw_low_level_read(8, &value1
,
558 &acpi_gbl_FADT
->xpm2_cnt_blk
);
561 case ACPI_REGISTER_PM_TIMER
: /* 32-bit access */
564 acpi_hw_low_level_read(32, &value1
,
565 &acpi_gbl_FADT
->xpm_tmr_blk
);
568 case ACPI_REGISTER_SMI_COMMAND_BLOCK
: /* 8-bit access */
570 status
= acpi_os_read_port(acpi_gbl_FADT
->smi_cmd
, &value1
, 8);
574 ACPI_ERROR((AE_INFO
, "Unknown Register ID: %X", register_id
));
575 status
= AE_BAD_PARAMETER
;
580 if (ACPI_MTX_LOCK
== use_lock
) {
581 (void)acpi_ut_release_mutex(ACPI_MTX_HARDWARE
);
584 if (ACPI_SUCCESS(status
)) {
585 *return_value
= value1
;
588 return_ACPI_STATUS(status
);
591 /******************************************************************************
593 * FUNCTION: acpi_hw_register_write
595 * PARAMETERS: use_lock - Mutex hw access
596 * register_id - register_iD + Offset
597 * Value - The value to write
601 * DESCRIPTION: Acpi register Write function. Registers are written at the
604 ******************************************************************************/
606 acpi_status
acpi_hw_register_write(u8 use_lock
, u32 register_id
, u32 value
)
610 ACPI_FUNCTION_TRACE(hw_register_write
);
612 if (ACPI_MTX_LOCK
== use_lock
) {
613 status
= acpi_ut_acquire_mutex(ACPI_MTX_HARDWARE
);
614 if (ACPI_FAILURE(status
)) {
615 return_ACPI_STATUS(status
);
619 switch (register_id
) {
620 case ACPI_REGISTER_PM1_STATUS
: /* 16-bit access */
623 acpi_hw_low_level_write(16, value
,
624 &acpi_gbl_FADT
->xpm1a_evt_blk
);
625 if (ACPI_FAILURE(status
)) {
626 goto unlock_and_exit
;
629 /* PM1B is optional */
632 acpi_hw_low_level_write(16, value
,
633 &acpi_gbl_FADT
->xpm1b_evt_blk
);
636 case ACPI_REGISTER_PM1_ENABLE
: /* 16-bit access */
639 acpi_hw_low_level_write(16, value
, &acpi_gbl_xpm1a_enable
);
640 if (ACPI_FAILURE(status
)) {
641 goto unlock_and_exit
;
644 /* PM1B is optional */
647 acpi_hw_low_level_write(16, value
, &acpi_gbl_xpm1b_enable
);
650 case ACPI_REGISTER_PM1_CONTROL
: /* 16-bit access */
653 acpi_hw_low_level_write(16, value
,
654 &acpi_gbl_FADT
->xpm1a_cnt_blk
);
655 if (ACPI_FAILURE(status
)) {
656 goto unlock_and_exit
;
660 acpi_hw_low_level_write(16, value
,
661 &acpi_gbl_FADT
->xpm1b_cnt_blk
);
664 case ACPI_REGISTER_PM1A_CONTROL
: /* 16-bit access */
667 acpi_hw_low_level_write(16, value
,
668 &acpi_gbl_FADT
->xpm1a_cnt_blk
);
671 case ACPI_REGISTER_PM1B_CONTROL
: /* 16-bit access */
674 acpi_hw_low_level_write(16, value
,
675 &acpi_gbl_FADT
->xpm1b_cnt_blk
);
678 case ACPI_REGISTER_PM2_CONTROL
: /* 8-bit access */
681 acpi_hw_low_level_write(8, value
,
682 &acpi_gbl_FADT
->xpm2_cnt_blk
);
685 case ACPI_REGISTER_PM_TIMER
: /* 32-bit access */
688 acpi_hw_low_level_write(32, value
,
689 &acpi_gbl_FADT
->xpm_tmr_blk
);
692 case ACPI_REGISTER_SMI_COMMAND_BLOCK
: /* 8-bit access */
694 /* SMI_CMD is currently always in IO space */
696 status
= acpi_os_write_port(acpi_gbl_FADT
->smi_cmd
, value
, 8);
700 status
= AE_BAD_PARAMETER
;
705 if (ACPI_MTX_LOCK
== use_lock
) {
706 (void)acpi_ut_release_mutex(ACPI_MTX_HARDWARE
);
709 return_ACPI_STATUS(status
);
712 /******************************************************************************
714 * FUNCTION: acpi_hw_low_level_read
716 * PARAMETERS: Width - 8, 16, or 32
717 * Value - Where the value is returned
718 * Reg - GAS register structure
722 * DESCRIPTION: Read from either memory or IO space.
724 ******************************************************************************/
727 acpi_hw_low_level_read(u32 width
, u32
* value
, struct acpi_generic_address
*reg
)
732 ACPI_FUNCTION_NAME(hw_low_level_read
);
735 * Must have a valid pointer to a GAS structure, and
736 * a non-zero address within. However, don't return an error
737 * because the PM1A/B code must not fail if B isn't present.
743 /* Get a local copy of the address. Handles possible alignment issues */
745 ACPI_MOVE_64_TO_64(&address
, ®
->address
);
752 * Two address spaces supported: Memory or IO.
753 * PCI_Config is not supported here because the GAS struct is insufficient
755 switch (reg
->address_space_id
) {
756 case ACPI_ADR_SPACE_SYSTEM_MEMORY
:
758 status
= acpi_os_read_memory((acpi_physical_address
) address
,
762 case ACPI_ADR_SPACE_SYSTEM_IO
:
764 status
= acpi_os_read_port((acpi_io_address
) address
,
770 "Unsupported address space: %X",
771 reg
->address_space_id
));
772 return (AE_BAD_PARAMETER
);
775 ACPI_DEBUG_PRINT((ACPI_DB_IO
,
776 "Read: %8.8X width %2d from %8.8X%8.8X (%s)\n",
778 ACPI_FORMAT_UINT64(address
),
779 acpi_ut_get_region_name(reg
->address_space_id
)));
784 /******************************************************************************
786 * FUNCTION: acpi_hw_low_level_write
788 * PARAMETERS: Width - 8, 16, or 32
789 * Value - To be written
790 * Reg - GAS register structure
794 * DESCRIPTION: Write to either memory or IO space.
796 ******************************************************************************/
799 acpi_hw_low_level_write(u32 width
, u32 value
, struct acpi_generic_address
* reg
)
804 ACPI_FUNCTION_NAME(hw_low_level_write
);
807 * Must have a valid pointer to a GAS structure, and
808 * a non-zero address within. However, don't return an error
809 * because the PM1A/B code must not fail if B isn't present.
815 /* Get a local copy of the address. Handles possible alignment issues */
817 ACPI_MOVE_64_TO_64(&address
, ®
->address
);
823 * Two address spaces supported: Memory or IO.
824 * PCI_Config is not supported here because the GAS struct is insufficient
826 switch (reg
->address_space_id
) {
827 case ACPI_ADR_SPACE_SYSTEM_MEMORY
:
829 status
= acpi_os_write_memory((acpi_physical_address
) address
,
833 case ACPI_ADR_SPACE_SYSTEM_IO
:
835 status
= acpi_os_write_port((acpi_io_address
) address
,
841 "Unsupported address space: %X",
842 reg
->address_space_id
));
843 return (AE_BAD_PARAMETER
);
846 ACPI_DEBUG_PRINT((ACPI_DB_IO
,
847 "Wrote: %8.8X width %2d to %8.8X%8.8X (%s)\n",
849 ACPI_FORMAT_UINT64(address
),
850 acpi_ut_get_region_name(reg
->address_space_id
)));