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kernel-fxtec-pro1x/drivers/acpi/hardware/hwregs.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

850 lines
23 KiB
C
Raw Blame History

/*******************************************************************************
*
* Module Name: hwregs - Read/write access functions for the various ACPI
* control and status registers.
*
******************************************************************************/
/*
* Copyright (C) 2000 - 2005, R. Byron Moore
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#include <linux/module.h>
#include <acpi/acpi.h>
#include <acpi/acnamesp.h>
#include <acpi/acevents.h>
#define _COMPONENT ACPI_HARDWARE
ACPI_MODULE_NAME ("hwregs")
/*******************************************************************************
*
* FUNCTION: acpi_hw_clear_acpi_status
*
* PARAMETERS: Flags - Lock the hardware or not
*
* RETURN: none
*
* DESCRIPTION: Clears all fixed and general purpose status bits
* THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
*
******************************************************************************/
acpi_status
acpi_hw_clear_acpi_status (
u32 flags)
{
acpi_status status;
ACPI_FUNCTION_TRACE ("hw_clear_acpi_status");
ACPI_DEBUG_PRINT ((ACPI_DB_IO, "About to write %04X to %04X\n",
ACPI_BITMASK_ALL_FIXED_STATUS,
(u16) acpi_gbl_FADT->xpm1a_evt_blk.address));
if (flags & ACPI_MTX_LOCK) {
status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
}
status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1_STATUS,
ACPI_BITMASK_ALL_FIXED_STATUS);
if (ACPI_FAILURE (status)) {
goto unlock_and_exit;
}
/* Clear the fixed events */
if (acpi_gbl_FADT->xpm1b_evt_blk.address) {
status = acpi_hw_low_level_write (16, ACPI_BITMASK_ALL_FIXED_STATUS,
&acpi_gbl_FADT->xpm1b_evt_blk);
if (ACPI_FAILURE (status)) {
goto unlock_and_exit;
}
}
/* Clear the GPE Bits in all GPE registers in all GPE blocks */
status = acpi_ev_walk_gpe_list (acpi_hw_clear_gpe_block, ACPI_ISR);
unlock_and_exit:
if (flags & ACPI_MTX_LOCK) {
(void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE);
}
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_get_sleep_type_data
*
* PARAMETERS: sleep_state - Numeric sleep state
* *sleep_type_a - Where SLP_TYPa is returned
* *sleep_type_b - Where SLP_TYPb is returned
*
* RETURN: Status - ACPI status
*
* DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested sleep
* state.
*
******************************************************************************/
acpi_status
acpi_get_sleep_type_data (
u8 sleep_state,
u8 *sleep_type_a,
u8 *sleep_type_b)
{
acpi_status status = AE_OK;
struct acpi_parameter_info info;
ACPI_FUNCTION_TRACE ("acpi_get_sleep_type_data");
/*
* Validate parameters
*/
if ((sleep_state > ACPI_S_STATES_MAX) ||
!sleep_type_a || !sleep_type_b) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/*
* Evaluate the namespace object containing the values for this state
*/
info.parameters = NULL;
status = acpi_ns_evaluate_by_name ((char *) acpi_gbl_sleep_state_names[sleep_state],
&info);
if (ACPI_FAILURE (status)) {
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%s while evaluating sleep_state [%s]\n",
acpi_format_exception (status), acpi_gbl_sleep_state_names[sleep_state]));
return_ACPI_STATUS (status);
}
/* Must have a return object */
if (!info.return_object) {
ACPI_REPORT_ERROR (("Missing Sleep State object\n"));
status = AE_NOT_EXIST;
}
/* It must be of type Package */
else if (ACPI_GET_OBJECT_TYPE (info.return_object) != ACPI_TYPE_PACKAGE) {
ACPI_REPORT_ERROR (("Sleep State object not a Package\n"));
status = AE_AML_OPERAND_TYPE;
}
/* The package must have at least two elements */
else if (info.return_object->package.count < 2) {
ACPI_REPORT_ERROR (("Sleep State package does not have at least two elements\n"));
status = AE_AML_NO_OPERAND;
}
/* The first two elements must both be of type Integer */
else if ((ACPI_GET_OBJECT_TYPE (info.return_object->package.elements[0]) != ACPI_TYPE_INTEGER) ||
(ACPI_GET_OBJECT_TYPE (info.return_object->package.elements[1]) != ACPI_TYPE_INTEGER)) {
ACPI_REPORT_ERROR (("Sleep State 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])));
status = AE_AML_OPERAND_TYPE;
}
else {
/*
* Valid _Sx_ package size, type, and value
*/
*sleep_type_a = (u8) (info.return_object->package.elements[0])->integer.value;
*sleep_type_b = (u8) (info.return_object->package.elements[1])->integer.value;
}
if (ACPI_FAILURE (status)) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"While evaluating sleep_state [%s], bad Sleep object %p type %s\n",
acpi_gbl_sleep_state_names[sleep_state], info.return_object,
acpi_ut_get_object_type_name (info.return_object)));
}
acpi_ut_remove_reference (info.return_object);
return_ACPI_STATUS (status);
}
EXPORT_SYMBOL(acpi_get_sleep_type_data);
/*******************************************************************************
*
* FUNCTION: acpi_hw_get_register_bit_mask
*
* PARAMETERS: register_id - Index of ACPI Register to access
*
* RETURN: The bit mask to be used when accessing the register
*
* DESCRIPTION: Map register_id into a register bit mask.
*
******************************************************************************/
struct acpi_bit_register_info *
acpi_hw_get_bit_register_info (
u32 register_id)
{
ACPI_FUNCTION_NAME ("hw_get_bit_register_info");
if (register_id > ACPI_BITREG_MAX) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Invalid bit_register ID: %X\n", register_id));
return (NULL);
}
return (&acpi_gbl_bit_register_info[register_id]);
}
/*******************************************************************************
*
* FUNCTION: acpi_get_register
*
* PARAMETERS: register_id - ID of ACPI bit_register to access
* return_value - Value that was read from the register
* Flags - Lock the hardware or not
*
* RETURN: Status and the value read from specified Register. Value
* returned is normalized to bit0 (is shifted all the way right)
*
* DESCRIPTION: ACPI bit_register read function.
*
******************************************************************************/
acpi_status
acpi_get_register (
u32 register_id,
u32 *return_value,
u32 flags)
{
u32 register_value = 0;
struct acpi_bit_register_info *bit_reg_info;
acpi_status status;
ACPI_FUNCTION_TRACE ("acpi_get_register");
/* Get the info structure corresponding to the requested ACPI Register */
bit_reg_info = acpi_hw_get_bit_register_info (register_id);
if (!bit_reg_info) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
if (flags & ACPI_MTX_LOCK) {
status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
}
/* Read from the register */
status = acpi_hw_register_read (ACPI_MTX_DO_NOT_LOCK,
bit_reg_info->parent_register, &register_value);
if (flags & ACPI_MTX_LOCK) {
(void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE);
}
if (ACPI_SUCCESS (status)) {
/* Normalize the value that was read */
register_value = ((register_value & bit_reg_info->access_bit_mask)
>> bit_reg_info->bit_position);
*return_value = register_value;
ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Read value %8.8X register %X\n",
register_value, bit_reg_info->parent_register));
}
return_ACPI_STATUS (status);
}
EXPORT_SYMBOL(acpi_get_register);
/*******************************************************************************
*
* FUNCTION: acpi_set_register
*
* PARAMETERS: register_id - ID of ACPI bit_register to access
* Value - (only used on write) value to write to the
* Register, NOT pre-normalized to the bit pos
* Flags - Lock the hardware or not
*
* RETURN: Status
*
* DESCRIPTION: ACPI Bit Register write function.
*
******************************************************************************/
acpi_status
acpi_set_register (
u32 register_id,
u32 value,
u32 flags)
{
u32 register_value = 0;
struct acpi_bit_register_info *bit_reg_info;
acpi_status status;
ACPI_FUNCTION_TRACE_U32 ("acpi_set_register", register_id);
/* Get the info structure corresponding to the requested ACPI Register */
bit_reg_info = acpi_hw_get_bit_register_info (register_id);
if (!bit_reg_info) {
ACPI_REPORT_ERROR (("Bad ACPI HW register_id: %X\n", register_id));
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
if (flags & ACPI_MTX_LOCK) {
status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
}
/* Always do a register read first so we can insert the new bits */
status = acpi_hw_register_read (ACPI_MTX_DO_NOT_LOCK,
bit_reg_info->parent_register, &register_value);
if (ACPI_FAILURE (status)) {
goto unlock_and_exit;
}
/*
* Decode the Register ID
* Register ID = [Register block ID] | [bit ID]
*
* Check bit ID to fine locate Register offset.
* Check Mask to determine Register offset, and then read-write.
*/
switch (bit_reg_info->parent_register) {
case ACPI_REGISTER_PM1_STATUS:
/*
* Status Registers are different from the rest. Clear by
* writing 1, and writing 0 has no effect. So, the only relevant
* information is the single bit we're interested in, all others should
* be written as 0 so they will be left unchanged.
*/
value = ACPI_REGISTER_PREPARE_BITS (value,
bit_reg_info->bit_position, bit_reg_info->access_bit_mask);
if (value) {
status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK,
ACPI_REGISTER_PM1_STATUS, (u16) value);
register_value = 0;
}
break;
case ACPI_REGISTER_PM1_ENABLE:
ACPI_REGISTER_INSERT_VALUE (register_value, bit_reg_info->bit_position,
bit_reg_info->access_bit_mask, value);
status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK,
ACPI_REGISTER_PM1_ENABLE, (u16) register_value);
break;
case ACPI_REGISTER_PM1_CONTROL:
/*
* Write the PM1 Control register.
* Note that at this level, the fact that there are actually TWO
* registers (A and B - and B may not exist) is abstracted.
*/
ACPI_DEBUG_PRINT ((ACPI_DB_IO, "PM1 control: Read %X\n", register_value));
ACPI_REGISTER_INSERT_VALUE (register_value, bit_reg_info->bit_position,
bit_reg_info->access_bit_mask, value);
status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK,
ACPI_REGISTER_PM1_CONTROL, (u16) register_value);
break;
case ACPI_REGISTER_PM2_CONTROL:
status = acpi_hw_register_read (ACPI_MTX_DO_NOT_LOCK,
ACPI_REGISTER_PM2_CONTROL, &register_value);
if (ACPI_FAILURE (status)) {
goto unlock_and_exit;
}
ACPI_DEBUG_PRINT ((ACPI_DB_IO, "PM2 control: Read %X from %8.8X%8.8X\n",
register_value,
ACPI_FORMAT_UINT64 (acpi_gbl_FADT->xpm2_cnt_blk.address)));
ACPI_REGISTER_INSERT_VALUE (register_value, bit_reg_info->bit_position,
bit_reg_info->access_bit_mask, value);
ACPI_DEBUG_PRINT ((ACPI_DB_IO, "About to write %4.4X to %8.8X%8.8X\n",
register_value,
ACPI_FORMAT_UINT64 (acpi_gbl_FADT->xpm2_cnt_blk.address)));
status = acpi_hw_register_write (ACPI_MTX_DO_NOT_LOCK,
ACPI_REGISTER_PM2_CONTROL, (u8) (register_value));
break;
default:
break;
}
unlock_and_exit:
if (flags & ACPI_MTX_LOCK) {
(void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE);
}
/* Normalize the value that was read */
ACPI_DEBUG_EXEC (register_value = ((register_value & bit_reg_info->access_bit_mask) >> bit_reg_info->bit_position));
ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Set bits: %8.8X actual %8.8X register %X\n",
value, register_value, bit_reg_info->parent_register));
return_ACPI_STATUS (status);
}
EXPORT_SYMBOL(acpi_set_register);
/******************************************************************************
*
* FUNCTION: acpi_hw_register_read
*
* PARAMETERS: use_lock - Mutex hw access
* register_id - register_iD + Offset
* return_value - Value that was read from the register
*
* RETURN: Status and the value read.
*
* DESCRIPTION: Acpi register read function. Registers are read at the
* given offset.
*
******************************************************************************/
acpi_status
acpi_hw_register_read (
u8 use_lock,
u32 register_id,
u32 *return_value)
{
u32 value1 = 0;
u32 value2 = 0;
acpi_status status;
ACPI_FUNCTION_TRACE ("hw_register_read");
if (ACPI_MTX_LOCK == use_lock) {
status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
}
switch (register_id) {
case ACPI_REGISTER_PM1_STATUS: /* 16-bit access */
status = acpi_hw_low_level_read (16, &value1, &acpi_gbl_FADT->xpm1a_evt_blk);
if (ACPI_FAILURE (status)) {
goto unlock_and_exit;
}
/* PM1B is optional */
status = acpi_hw_low_level_read (16, &value2, &acpi_gbl_FADT->xpm1b_evt_blk);
value1 |= value2;
break;
case ACPI_REGISTER_PM1_ENABLE: /* 16-bit access */
status = acpi_hw_low_level_read (16, &value1, &acpi_gbl_xpm1a_enable);
if (ACPI_FAILURE (status)) {
goto unlock_and_exit;
}
/* PM1B is optional */
status = acpi_hw_low_level_read (16, &value2, &acpi_gbl_xpm1b_enable);
value1 |= value2;
break;
case ACPI_REGISTER_PM1_CONTROL: /* 16-bit access */
status = acpi_hw_low_level_read (16, &value1, &acpi_gbl_FADT->xpm1a_cnt_blk);
if (ACPI_FAILURE (status)) {
goto unlock_and_exit;
}
status = acpi_hw_low_level_read (16, &value2, &acpi_gbl_FADT->xpm1b_cnt_blk);
value1 |= value2;
break;
case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */
status = acpi_hw_low_level_read (8, &value1, &acpi_gbl_FADT->xpm2_cnt_blk);
break;
case ACPI_REGISTER_PM_TIMER: /* 32-bit access */
status = acpi_hw_low_level_read (32, &value1, &acpi_gbl_FADT->xpm_tmr_blk);
break;
case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */
status = acpi_os_read_port (acpi_gbl_FADT->smi_cmd, &value1, 8);
break;
default:
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Unknown Register ID: %X\n", register_id));
status = AE_BAD_PARAMETER;
break;
}
unlock_and_exit:
if (ACPI_MTX_LOCK == use_lock) {
(void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE);
}
if (ACPI_SUCCESS (status)) {
*return_value = value1;
}
return_ACPI_STATUS (status);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_register_write
*
* PARAMETERS: use_lock - Mutex hw access
* register_id - register_iD + Offset
* Value - The value to write
*
* RETURN: Status
*
* DESCRIPTION: Acpi register Write function. Registers are written at the
* given offset.
*
******************************************************************************/
acpi_status
acpi_hw_register_write (
u8 use_lock,
u32 register_id,
u32 value)
{
acpi_status status;
ACPI_FUNCTION_TRACE ("hw_register_write");
if (ACPI_MTX_LOCK == use_lock) {
status = acpi_ut_acquire_mutex (ACPI_MTX_HARDWARE);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
}
switch (register_id) {
case ACPI_REGISTER_PM1_STATUS: /* 16-bit access */
status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1a_evt_blk);
if (ACPI_FAILURE (status)) {
goto unlock_and_exit;
}
/* PM1B is optional */
status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1b_evt_blk);
break;
case ACPI_REGISTER_PM1_ENABLE: /* 16-bit access*/
status = acpi_hw_low_level_write (16, value, &acpi_gbl_xpm1a_enable);
if (ACPI_FAILURE (status)) {
goto unlock_and_exit;
}
/* PM1B is optional */
status = acpi_hw_low_level_write (16, value, &acpi_gbl_xpm1b_enable);
break;
case ACPI_REGISTER_PM1_CONTROL: /* 16-bit access */
status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1a_cnt_blk);
if (ACPI_FAILURE (status)) {
goto unlock_and_exit;
}
status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1b_cnt_blk);
break;
case ACPI_REGISTER_PM1A_CONTROL: /* 16-bit access */
status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1a_cnt_blk);
break;
case ACPI_REGISTER_PM1B_CONTROL: /* 16-bit access */
status = acpi_hw_low_level_write (16, value, &acpi_gbl_FADT->xpm1b_cnt_blk);
break;
case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */
status = acpi_hw_low_level_write (8, value, &acpi_gbl_FADT->xpm2_cnt_blk);
break;
case ACPI_REGISTER_PM_TIMER: /* 32-bit access */
status = acpi_hw_low_level_write (32, value, &acpi_gbl_FADT->xpm_tmr_blk);
break;
case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */
/* SMI_CMD is currently always in IO space */
status = acpi_os_write_port (acpi_gbl_FADT->smi_cmd, value, 8);
break;
default:
status = AE_BAD_PARAMETER;
break;
}
unlock_and_exit:
if (ACPI_MTX_LOCK == use_lock) {
(void) acpi_ut_release_mutex (ACPI_MTX_HARDWARE);
}
return_ACPI_STATUS (status);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_low_level_read
*
* PARAMETERS: Width - 8, 16, or 32
* Value - Where the value is returned
* Reg - GAS register structure
*
* RETURN: Status
*
* DESCRIPTION: Read from either memory or IO space.
*
******************************************************************************/
acpi_status
acpi_hw_low_level_read (
u32 width,
u32 *value,
struct acpi_generic_address *reg)
{
u64 address;
acpi_status status;
ACPI_FUNCTION_NAME ("hw_low_level_read");
/*
* Must have a valid pointer to a GAS structure, and
* a non-zero address within. However, don't return an error
* because the PM1A/B code must not fail if B isn't present.
*/
if (!reg) {
return (AE_OK);
}
/* Get a local copy of the address. Handles possible alignment issues */
ACPI_MOVE_64_TO_64 (&address, &reg->address);
if (!address) {
return (AE_OK);
}
*value = 0;
/*
* Two address spaces supported: Memory or IO.
* PCI_Config is not supported here because the GAS struct is insufficient
*/
switch (reg->address_space_id) {
case ACPI_ADR_SPACE_SYSTEM_MEMORY:
status = acpi_os_read_memory (
(acpi_physical_address) address,
value, width);
break;
case ACPI_ADR_SPACE_SYSTEM_IO:
status = acpi_os_read_port ((acpi_io_address) address,
value, width);
break;
default:
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Unsupported address space: %X\n", reg->address_space_id));
return (AE_BAD_PARAMETER);
}
ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Read: %8.8X width %2d from %8.8X%8.8X (%s)\n",
*value, width,
ACPI_FORMAT_UINT64 (address),
acpi_ut_get_region_name (reg->address_space_id)));
return (status);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_low_level_write
*
* PARAMETERS: Width - 8, 16, or 32
* Value - To be written
* Reg - GAS register structure
*
* RETURN: Status
*
* DESCRIPTION: Write to either memory or IO space.
*
******************************************************************************/
acpi_status
acpi_hw_low_level_write (
u32 width,
u32 value,
struct acpi_generic_address *reg)
{
u64 address;
acpi_status status;
ACPI_FUNCTION_NAME ("hw_low_level_write");
/*
* Must have a valid pointer to a GAS structure, and
* a non-zero address within. However, don't return an error
* because the PM1A/B code must not fail if B isn't present.
*/
if (!reg) {
return (AE_OK);
}
/* Get a local copy of the address. Handles possible alignment issues */
ACPI_MOVE_64_TO_64 (&address, &reg->address);
if (!address) {
return (AE_OK);
}
/*
* Two address spaces supported: Memory or IO.
* PCI_Config is not supported here because the GAS struct is insufficient
*/
switch (reg->address_space_id) {
case ACPI_ADR_SPACE_SYSTEM_MEMORY:
status = acpi_os_write_memory (
(acpi_physical_address) address,
value, width);
break;
case ACPI_ADR_SPACE_SYSTEM_IO:
status = acpi_os_write_port ((acpi_io_address) address,
value, width);
break;
default:
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Unsupported address space: %X\n", reg->address_space_id));
return (AE_BAD_PARAMETER);
}
ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Wrote: %8.8X width %2d to %8.8X%8.8X (%s)\n",
value, width,
ACPI_FORMAT_UINT64 (address),
acpi_ut_get_region_name (reg->address_space_id)));
return (status);
}
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