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path: root/drivers/acpi/hardware/hwregs.c
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Diffstat (limited to 'drivers/acpi/hardware/hwregs.c')
-rw-r--r--drivers/acpi/hardware/hwregs.c850
1 files changed, 850 insertions, 0 deletions
diff --git a/drivers/acpi/hardware/hwregs.c b/drivers/acpi/hardware/hwregs.c
new file mode 100644
index 000000000000..91af0c2ddcf7
--- /dev/null
+++ b/drivers/acpi/hardware/hwregs.c
@@ -0,0 +1,850 @@
+
+/*******************************************************************************
+ *
+ * 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);
+}