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linux-2.6/drivers/acpi/hardware/hwregs.c
Bob Moore 967440e3be ACPI: ACPICA 20060623 
Implemented a new acpi_spinlock type for the OSL lock
interfaces.  This allows the type to be customized to
the host OS for improved efficiency (since a spinlock is
usually a very small object.)

Implemented support for "ignored" bits in the ACPI
registers.  According to the ACPI specification, these
bits should be preserved when writing the registers via
a read/modify/write cycle. There are 3 bits preserved
in this manner: PM1_CONTROL[0] (SCI_EN), PM1_CONTROL[9],
and PM1_STATUS[11].
http://bugzilla.kernel.org/show_bug.cgi?id=3691

Implemented the initial deployment of new OSL mutex
interfaces.  Since some host operating systems have
separate mutex and semaphore objects, this feature was
requested. The base code now uses mutexes (and the new
mutex interfaces) wherever a binary semaphore was used
previously. However, for the current release, the mutex
interfaces are defined as macros to map them to the
existing semaphore interfaces.

Fixed several problems with the support for the control
method SyncLevel parameter. The SyncLevel now works
according to the ACPI specification and in concert with the
Mutex SyncLevel parameter, since the current SyncLevel is
a property of the executing thread. Mutual exclusion for
control methods is now implemented with a mutex instead
of a semaphore.

Fixed three instances of the use of the C shift operator
in the bitfield support code (exfldio.c) to avoid the use
of a shift value larger than the target data width. The
behavior of C compilers is undefined in this case and can
cause unpredictable results, and therefore the case must
be detected and avoided.  (Fiodor Suietov)

Added an info message whenever an SSDT or OEM table
is loaded dynamically via the Load() or LoadTable()
ASL operators. This should improve debugging capability
since it will show exactly what tables have been loaded
(beyond the tables present in the RSDT/XSDT.)

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2006-06-28 03:11:38 -04:00

887 lines
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/*******************************************************************************
*
* Module Name: hwregs - Read/write access functions for the various ACPI
* control and status registers.
*
******************************************************************************/
/*
* Copyright (C) 2000 - 2006, 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 <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
*
* NOTE: TBD: Flags parameter is obsolete, to be removed
*
******************************************************************************/
acpi_status acpi_hw_clear_acpi_status(u32 flags)
{
acpi_status status;
acpi_cpu_flags lock_flags = 0;
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));
lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
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);
unlock_and_exit:
acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
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_evaluate_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);
}
/* Allocate the evaluation information block */
info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
if (!info) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
info->pathname =
ACPI_CAST_PTR(char, acpi_gbl_sleep_state_names[sleep_state]);
/* Evaluate the namespace object containing the values for this state */
status = acpi_ns_evaluate(info);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"%s while evaluating SleepState [%s]\n",
acpi_format_exception(status),
info->pathname));
goto cleanup;
}
/* Must have a return object */
if (!info->return_object) {
ACPI_ERROR((AE_INFO, "No Sleep State object returned from [%s]",
info->pathname));
status = AE_NOT_EXIST;
}
/* It must be of type Package */
else if (ACPI_GET_OBJECT_TYPE(info->return_object) != ACPI_TYPE_PACKAGE) {
ACPI_ERROR((AE_INFO,
"Sleep State return object is not a Package"));
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_ERROR((AE_INFO,
"Sleep State return package does not have at least two elements"));
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_ERROR((AE_INFO,
"Sleep State return package elements are not both Integers (%s, %s)",
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_EXCEPTION((AE_INFO, status,
"While evaluating SleepState [%s], bad Sleep object %p type %s",
info->pathname, info->return_object,
acpi_ut_get_object_type_name(info->
return_object)));
}
acpi_ut_remove_reference(info->return_object);
cleanup:
ACPI_FREE(info);
return_ACPI_STATUS(status);
}
ACPI_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_ENTRY();
if (register_id > ACPI_BITREG_MAX) {
ACPI_ERROR((AE_INFO, "Invalid BitRegister ID: %X",
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.
*
* NOTE: TBD: Flags parameter is obsolete, to be removed
*
******************************************************************************/
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);
}
/* Read from the register */
status = acpi_hw_register_read(ACPI_MTX_LOCK,
bit_reg_info->parent_register,
&register_value);
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);
}
ACPI_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.
*
* NOTE: TBD: Flags parameter is obsolete, to be removed
*
******************************************************************************/
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_cpu_flags lock_flags;
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_ERROR((AE_INFO, "Bad ACPI HW RegisterId: %X",
register_id));
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
/* 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:
acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
/* 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);
}
ACPI_EXPORT_SYMBOL(acpi_set_register)
/******************************************************************************
*
* FUNCTION: acpi_hw_register_read
*
* PARAMETERS: use_lock - Lock hardware? True/False
* register_id - ACPI Register ID
* return_value - Where the register value is returned
*
* RETURN: Status and the value read.
*
* DESCRIPTION: Read from the specified ACPI register
*
******************************************************************************/
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_cpu_flags lock_flags = 0;
ACPI_FUNCTION_TRACE(hw_register_read);
if (ACPI_MTX_LOCK == use_lock) {
lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
}
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_ERROR((AE_INFO, "Unknown Register ID: %X", register_id));
status = AE_BAD_PARAMETER;
break;
}
unlock_and_exit:
if (ACPI_MTX_LOCK == use_lock) {
acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
}
if (ACPI_SUCCESS(status)) {
*return_value = value1;
}
return_ACPI_STATUS(status);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_register_write
*
* PARAMETERS: use_lock - Lock hardware? True/False
* register_id - ACPI Register ID
* Value - The value to write
*
* RETURN: Status
*
* DESCRIPTION: Write to the specified ACPI register
*
* NOTE: In accordance with the ACPI specification, this function automatically
* preserves the value of the following bits, meaning that these bits cannot be
* changed via this interface:
*
* PM1_CONTROL[0] = SCI_EN
* PM1_CONTROL[9]
* PM1_STATUS[11]
*
* ACPI References:
* 1) Hardware Ignored Bits: When software writes to a register with ignored
* bit fields, it preserves the ignored bit fields
* 2) SCI_EN: OSPM always preserves this bit position
*
******************************************************************************/
acpi_status acpi_hw_register_write(u8 use_lock, u32 register_id, u32 value)
{
acpi_status status;
acpi_cpu_flags lock_flags = 0;
u32 read_value;
ACPI_FUNCTION_TRACE(hw_register_write);
if (ACPI_MTX_LOCK == use_lock) {
lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
}
switch (register_id) {
case ACPI_REGISTER_PM1_STATUS: /* 16-bit access */
/* Perform a read first to preserve certain bits (per ACPI spec) */
status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
ACPI_REGISTER_PM1_STATUS,
&read_value);
if (ACPI_FAILURE(status)) {
goto unlock_and_exit;
}
/* Insert the bits to be preserved */
ACPI_INSERT_BITS(value, ACPI_PM1_STATUS_PRESERVED_BITS,
read_value);
/* Now we can write the data */
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 */
/*
* Perform a read first to preserve certain bits (per ACPI spec)
*
* Note: This includes SCI_EN, we never want to change this bit
*/
status = acpi_hw_register_read(ACPI_MTX_DO_NOT_LOCK,
ACPI_REGISTER_PM1_CONTROL,
&read_value);
if (ACPI_FAILURE(status)) {
goto unlock_and_exit;
}
/* Insert the bits to be preserved */
ACPI_INSERT_BITS(value, ACPI_PM1_CONTROL_PRESERVED_BITS,
read_value);
/* Now we can write the data */
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) {
acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
}
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_ERROR((AE_INFO,
"Unsupported address space: %X",
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_ERROR((AE_INFO,
"Unsupported address space: %X",
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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