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linux/drivers/acpi/hardware/hwregs.c
Robert Moore 44f6c01242 ACPICA 20050408 from Bob Moore 
Fixed three cases in the interpreter where an "index"
argument to an ASL function was still (internally) 32
bits instead of the required 64 bits.  This was the Index
argument to the Index, Mid, and Match operators.

The "strupr" function is now permanently local
(acpi_ut_strupr), since this is not a POSIX-defined
function and not present in most kernel-level C
libraries. References to the C library strupr function
have been removed from the headers.

Completed the deployment of static
functions/prototypes. All prototypes with the static
attribute have been moved from the headers to the owning
C file.

ACPICA 20050329 from Bob Moore

An error is now generated if an attempt is made to create
a Buffer Field of length zero (A CreateField with a length
operand of zero.)

The interpreter now issues a warning whenever executable
code at the module level is detected during ACPI table
load. This will give some idea of the prevalence of this
type of code.

Implemented support for references to named objects (other
than control methods) within package objects.

Enhanced package object output for the debug
object. Package objects are now completely dumped, showing
all elements.

Enhanced miscellaneous object output for the debug
object. Any object can now be written to the debug object
(for example, a device object can be written, and the type
of the object will be displayed.)

The "static" qualifier has been added to all local
functions across the core subsystem.

The number of "long" lines (> 80 chars) within the source
has been significantly reduced, by about 1/3.

Cleaned up all header files to ensure that all CA/iASL
functions are prototyped (even static functions) and the
formatting is consistent.

Two new header files have been added, acopcode.h and
acnames.h.

Removed several obsolete functions that were no longer
used.

Signed-off-by: Len Brown <len.brown@intel.com>
2005-07-12 00:08:52 -04:00

872 lines
24 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;
char *sleep_state_name;
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;
info.return_object = NULL;
sleep_state_name = (char *) acpi_gbl_sleep_state_names[sleep_state];
status = acpi_ns_evaluate_by_name (sleep_state_name, &info);
if (ACPI_FAILURE (status)) {
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
"%s while evaluating sleep_state [%s]\n",
acpi_format_exception (status), sleep_state_name));
return_ACPI_STATUS (status);
}
/* Must have a return object */
if (!info.return_object) {
ACPI_REPORT_ERROR (("No Sleep State object returned from [%s]\n",
sleep_state_name));
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 return object is not a Package\n"));
status = AE_AML_OPERAND_TYPE;
}
/*
* The package must have at least two elements. NOTE (March 2005): This
* goes against the current ACPI spec which defines this object as a
* package with one encoded DWORD element. However, existing practice
* by BIOS vendors seems to be to have 2 or more elements, at least
* one per sleep type (A/B).
*/
else if (info.return_object->package.count < 2) {
ACPI_REPORT_ERROR ((
"Sleep State return 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 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])));
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,
"%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)));
}
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 bitmask to be used when accessing the register
*
* DESCRIPTION: Map register_id into a register bitmask.
*
******************************************************************************/
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 - Where the register value is returned
*
* 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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