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path: root/drivers/acpi/acpica/hwxface.c
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Diffstat (limited to 'drivers/acpi/acpica/hwxface.c')
-rw-r--r--drivers/acpi/acpica/hwxface.c553
1 files changed, 553 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/hwxface.c b/drivers/acpi/acpica/hwxface.c
new file mode 100644
index 00000000..a716fede
--- /dev/null
+++ b/drivers/acpi/acpica/hwxface.c
@@ -0,0 +1,553 @@
+
+/******************************************************************************
+ *
+ * Module Name: hwxface - Public ACPICA hardware interfaces
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2012, Intel Corp.
+ * 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/export.h>
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "acnamesp.h"
+
+#define _COMPONENT ACPI_HARDWARE
+ACPI_MODULE_NAME("hwxface")
+
+/******************************************************************************
+ *
+ * FUNCTION: acpi_reset
+ *
+ * PARAMETERS: None
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Set reset register in memory or IO space. Note: Does not
+ * support reset register in PCI config space, this must be
+ * handled separately.
+ *
+ ******************************************************************************/
+acpi_status acpi_reset(void)
+{
+ struct acpi_generic_address *reset_reg;
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE(acpi_reset);
+
+ reset_reg = &acpi_gbl_FADT.reset_register;
+
+ /* Check if the reset register is supported */
+
+ if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) ||
+ !reset_reg->address) {
+ return_ACPI_STATUS(AE_NOT_EXIST);
+ }
+
+ if (reset_reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
+ /*
+ * For I/O space, write directly to the OSL. This
+ * bypasses the port validation mechanism, which may
+ * block a valid write to the reset register. Spec
+ * section 4.7.3.6 requires register width to be 8.
+ */
+ status =
+ acpi_os_write_port((acpi_io_address) reset_reg->address,
+ acpi_gbl_FADT.reset_value, 8);
+ } else {
+ /* Write the reset value to the reset register */
+
+ status = acpi_hw_write(acpi_gbl_FADT.reset_value, reset_reg);
+ }
+
+ return_ACPI_STATUS(status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_reset)
+
+/******************************************************************************
+ *
+ * FUNCTION: acpi_read
+ *
+ * PARAMETERS: Value - Where the value is returned
+ * Reg - GAS register structure
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Read from either memory or IO space.
+ *
+ * LIMITATIONS: <These limitations also apply to acpi_write>
+ * bit_width must be exactly 8, 16, 32, or 64.
+ * space_iD must be system_memory or system_iO.
+ * bit_offset and access_width are currently ignored, as there has
+ * not been a need to implement these.
+ *
+ ******************************************************************************/
+acpi_status acpi_read(u64 *return_value, struct acpi_generic_address *reg)
+{
+ u32 value;
+ u32 width;
+ u64 address;
+ acpi_status status;
+
+ ACPI_FUNCTION_NAME(acpi_read);
+
+ if (!return_value) {
+ return (AE_BAD_PARAMETER);
+ }
+
+ /* Validate contents of the GAS register. Allow 64-bit transfers */
+
+ status = acpi_hw_validate_register(reg, 64, &address);
+ if (ACPI_FAILURE(status)) {
+ return (status);
+ }
+
+ /* Initialize entire 64-bit return value to zero */
+
+ *return_value = 0;
+ value = 0;
+
+ /*
+ * Two address spaces supported: Memory or IO. PCI_Config is
+ * not supported here because the GAS structure is insufficient
+ */
+ if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
+ status = acpi_os_read_memory((acpi_physical_address)
+ address, return_value,
+ reg->bit_width);
+ if (ACPI_FAILURE(status)) {
+ return (status);
+ }
+ } else { /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */
+
+ width = reg->bit_width;
+ if (width == 64) {
+ width = 32; /* Break into two 32-bit transfers */
+ }
+
+ status = acpi_hw_read_port((acpi_io_address)
+ address, &value, width);
+ if (ACPI_FAILURE(status)) {
+ return (status);
+ }
+ *return_value = value;
+
+ if (reg->bit_width == 64) {
+
+ /* Read the top 32 bits */
+
+ status = acpi_hw_read_port((acpi_io_address)
+ (address + 4), &value, 32);
+ if (ACPI_FAILURE(status)) {
+ return (status);
+ }
+ *return_value |= ((u64)value << 32);
+ }
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_IO,
+ "Read: %8.8X%8.8X width %2d from %8.8X%8.8X (%s)\n",
+ ACPI_FORMAT_UINT64(*return_value), reg->bit_width,
+ ACPI_FORMAT_UINT64(address),
+ acpi_ut_get_region_name(reg->space_id)));
+
+ return (status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_read)
+
+/******************************************************************************
+ *
+ * FUNCTION: acpi_write
+ *
+ * PARAMETERS: Value - Value to be written
+ * Reg - GAS register structure
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Write to either memory or IO space.
+ *
+ ******************************************************************************/
+acpi_status acpi_write(u64 value, struct acpi_generic_address *reg)
+{
+ u32 width;
+ u64 address;
+ acpi_status status;
+
+ ACPI_FUNCTION_NAME(acpi_write);
+
+ /* Validate contents of the GAS register. Allow 64-bit transfers */
+
+ status = acpi_hw_validate_register(reg, 64, &address);
+ if (ACPI_FAILURE(status)) {
+ return (status);
+ }
+
+ /*
+ * Two address spaces supported: Memory or IO. PCI_Config is
+ * not supported here because the GAS structure is insufficient
+ */
+ if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
+ status = acpi_os_write_memory((acpi_physical_address)
+ address, value, reg->bit_width);
+ if (ACPI_FAILURE(status)) {
+ return (status);
+ }
+ } else { /* ACPI_ADR_SPACE_SYSTEM_IO, validated earlier */
+
+ width = reg->bit_width;
+ if (width == 64) {
+ width = 32; /* Break into two 32-bit transfers */
+ }
+
+ status = acpi_hw_write_port((acpi_io_address)
+ address, ACPI_LODWORD(value),
+ width);
+ if (ACPI_FAILURE(status)) {
+ return (status);
+ }
+
+ if (reg->bit_width == 64) {
+ status = acpi_hw_write_port((acpi_io_address)
+ (address + 4),
+ ACPI_HIDWORD(value), 32);
+ if (ACPI_FAILURE(status)) {
+ return (status);
+ }
+ }
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_IO,
+ "Wrote: %8.8X%8.8X width %2d to %8.8X%8.8X (%s)\n",
+ ACPI_FORMAT_UINT64(value), reg->bit_width,
+ ACPI_FORMAT_UINT64(address),
+ acpi_ut_get_region_name(reg->space_id)));
+
+ return (status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_write)
+
+#if (!ACPI_REDUCED_HARDWARE)
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_read_bit_register
+ *
+ * PARAMETERS: register_id - ID of ACPI Bit Register to access
+ * return_value - Value that was read from the register,
+ * normalized to bit position zero.
+ *
+ * RETURN: Status and the value read from the specified Register. Value
+ * returned is normalized to bit0 (is shifted all the way right)
+ *
+ * DESCRIPTION: ACPI bit_register read function. Does not acquire the HW lock.
+ *
+ * SUPPORTS: Bit fields in PM1 Status, PM1 Enable, PM1 Control, and
+ * PM2 Control.
+ *
+ * Note: The hardware lock is not required when reading the ACPI bit registers
+ * since almost all of them are single bit and it does not matter that
+ * the parent hardware register can be split across two physical
+ * registers. The only multi-bit field is SLP_TYP in the PM1 control
+ * register, but this field does not cross an 8-bit boundary (nor does
+ * it make much sense to actually read this field.)
+ *
+ ******************************************************************************/
+acpi_status acpi_read_bit_register(u32 register_id, u32 *return_value)
+{
+ struct acpi_bit_register_info *bit_reg_info;
+ u32 register_value;
+ u32 value;
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE_U32(acpi_read_bit_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) {
+ return_ACPI_STATUS(AE_BAD_PARAMETER);
+ }
+
+ /* Read the entire parent register */
+
+ status = acpi_hw_register_read(bit_reg_info->parent_register,
+ &register_value);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ /* Normalize the value that was read, mask off other bits */
+
+ value = ((register_value & bit_reg_info->access_bit_mask)
+ >> bit_reg_info->bit_position);
+
+ ACPI_DEBUG_PRINT((ACPI_DB_IO,
+ "BitReg %X, ParentReg %X, Actual %8.8X, ReturnValue %8.8X\n",
+ register_id, bit_reg_info->parent_register,
+ register_value, value));
+
+ *return_value = value;
+ return_ACPI_STATUS(AE_OK);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_read_bit_register)
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_write_bit_register
+ *
+ * PARAMETERS: register_id - ID of ACPI Bit Register to access
+ * Value - Value to write to the register, in bit
+ * position zero. The bit is automatically
+ * shifted to the correct position.
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: ACPI Bit Register write function. Acquires the hardware lock
+ * since most operations require a read/modify/write sequence.
+ *
+ * SUPPORTS: Bit fields in PM1 Status, PM1 Enable, PM1 Control, and
+ * PM2 Control.
+ *
+ * Note that at this level, the fact that there may be actually two
+ * hardware registers (A and B - and B may not exist) is abstracted.
+ *
+ ******************************************************************************/
+acpi_status acpi_write_bit_register(u32 register_id, u32 value)
+{
+ struct acpi_bit_register_info *bit_reg_info;
+ acpi_cpu_flags lock_flags;
+ u32 register_value;
+ acpi_status status = AE_OK;
+
+ ACPI_FUNCTION_TRACE_U32(acpi_write_bit_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) {
+ return_ACPI_STATUS(AE_BAD_PARAMETER);
+ }
+
+ lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
+
+ /*
+ * At this point, we know that the parent register is one of the
+ * following: PM1 Status, PM1 Enable, PM1 Control, or PM2 Control
+ */
+ if (bit_reg_info->parent_register != ACPI_REGISTER_PM1_STATUS) {
+ /*
+ * 1) Case for PM1 Enable, PM1 Control, and PM2 Control
+ *
+ * Perform a register read to preserve the bits that we are not
+ * interested in
+ */
+ status = acpi_hw_register_read(bit_reg_info->parent_register,
+ &register_value);
+ if (ACPI_FAILURE(status)) {
+ goto unlock_and_exit;
+ }
+
+ /*
+ * Insert the input bit into the value that was just read
+ * and write the register
+ */
+ ACPI_REGISTER_INSERT_VALUE(register_value,
+ bit_reg_info->bit_position,
+ bit_reg_info->access_bit_mask,
+ value);
+
+ status = acpi_hw_register_write(bit_reg_info->parent_register,
+ register_value);
+ } else {
+ /*
+ * 2) Case for PM1 Status
+ *
+ * The Status register is different from the rest. Clear an event
+ * by writing 1, 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.
+ */
+ register_value = ACPI_REGISTER_PREPARE_BITS(value,
+ bit_reg_info->
+ bit_position,
+ bit_reg_info->
+ access_bit_mask);
+
+ /* No need to write the register if value is all zeros */
+
+ if (register_value) {
+ status =
+ acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS,
+ register_value);
+ }
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_IO,
+ "BitReg %X, ParentReg %X, Value %8.8X, Actual %8.8X\n",
+ register_id, bit_reg_info->parent_register, value,
+ register_value));
+
+unlock_and_exit:
+
+ acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
+ return_ACPI_STATUS(status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_write_bit_register)
+#endif /* !ACPI_REDUCED_HARDWARE */
+/*******************************************************************************
+ *
+ * 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 (info->return_object->common.type != 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 (((info->return_object->package.elements[0])->common.type
+ != ACPI_TYPE_INTEGER) ||
+ ((info->return_object->package.elements[1])->common.type
+ != 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)
generated by cgit (git 2.34.1) at 2025-01-05 00:40:53 +0000