449 lines
13 KiB
C
449 lines
13 KiB
C
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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: hwxface - Public ACPICA hardware interfaces
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*
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* Copyright (C) 2000 - 2019, Intel Corp.
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*
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*****************************************************************************/
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#define EXPORT_ACPI_INTERFACES
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acnamesp.h"
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#define _COMPONENT ACPI_HARDWARE
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ACPI_MODULE_NAME("hwxface")
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/******************************************************************************
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*
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* FUNCTION: acpi_reset
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*
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* PARAMETERS: None
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*
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* RETURN: Status
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*
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* DESCRIPTION: Set reset register in memory or IO space. Note: Does not
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* support reset register in PCI config space, this must be
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* handled separately.
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*
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******************************************************************************/
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acpi_status acpi_reset(void)
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{
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struct acpi_generic_address *reset_reg;
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acpi_status status;
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ACPI_FUNCTION_TRACE(acpi_reset);
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reset_reg = &acpi_gbl_FADT.reset_register;
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/* Check if the reset register is supported */
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if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER) ||
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!reset_reg->address) {
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return_ACPI_STATUS(AE_NOT_EXIST);
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}
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if (reset_reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
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/*
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* For I/O space, write directly to the OSL. This bypasses the port
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* validation mechanism, which may block a valid write to the reset
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* register.
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*
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* NOTE:
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* The ACPI spec requires the reset register width to be 8, so we
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* hardcode it here and ignore the FADT value. This maintains
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* compatibility with other ACPI implementations that have allowed
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* BIOS code with bad register width values to go unnoticed.
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*/
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status = acpi_os_write_port((acpi_io_address)reset_reg->address,
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acpi_gbl_FADT.reset_value,
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ACPI_RESET_REGISTER_WIDTH);
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} else {
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/* Write the reset value to the reset register */
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status = acpi_hw_write(acpi_gbl_FADT.reset_value, reset_reg);
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}
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return_ACPI_STATUS(status);
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}
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ACPI_EXPORT_SYMBOL(acpi_reset)
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/******************************************************************************
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*
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* FUNCTION: acpi_read
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*
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* PARAMETERS: value - Where the value is returned
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* reg - GAS register structure
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*
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* RETURN: Status
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*
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* DESCRIPTION: Read from either memory or IO space.
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*
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* LIMITATIONS: <These limitations also apply to acpi_write>
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* bit_width must be exactly 8, 16, 32, or 64.
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* space_ID must be system_memory or system_IO.
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* bit_offset and access_width are currently ignored, as there has
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* not been a need to implement these.
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*
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******************************************************************************/
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acpi_status acpi_read(u64 *return_value, struct acpi_generic_address *reg)
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{
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acpi_status status;
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ACPI_FUNCTION_NAME(acpi_read);
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status = acpi_hw_read(return_value, reg);
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return (status);
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}
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ACPI_EXPORT_SYMBOL(acpi_read)
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/******************************************************************************
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*
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* FUNCTION: acpi_write
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*
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* PARAMETERS: value - Value to be written
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* reg - GAS register structure
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*
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* RETURN: Status
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*
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* DESCRIPTION: Write to either memory or IO space.
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*
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******************************************************************************/
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acpi_status acpi_write(u64 value, struct acpi_generic_address *reg)
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{
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acpi_status status;
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ACPI_FUNCTION_NAME(acpi_write);
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status = acpi_hw_write(value, reg);
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return (status);
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}
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ACPI_EXPORT_SYMBOL(acpi_write)
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#if (!ACPI_REDUCED_HARDWARE)
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/*******************************************************************************
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*
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* FUNCTION: acpi_read_bit_register
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*
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* PARAMETERS: register_id - ID of ACPI Bit Register to access
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* return_value - Value that was read from the register,
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* normalized to bit position zero.
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*
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* RETURN: Status and the value read from the specified Register. Value
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* returned is normalized to bit0 (is shifted all the way right)
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*
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* DESCRIPTION: ACPI bit_register read function. Does not acquire the HW lock.
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*
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* SUPPORTS: Bit fields in PM1 Status, PM1 Enable, PM1 Control, and
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* PM2 Control.
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*
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* Note: The hardware lock is not required when reading the ACPI bit registers
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* since almost all of them are single bit and it does not matter that
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* the parent hardware register can be split across two physical
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* registers. The only multi-bit field is SLP_TYP in the PM1 control
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* register, but this field does not cross an 8-bit boundary (nor does
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* it make much sense to actually read this field.)
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*
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******************************************************************************/
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acpi_status acpi_read_bit_register(u32 register_id, u32 *return_value)
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{
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struct acpi_bit_register_info *bit_reg_info;
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u32 register_value;
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u32 value;
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acpi_status status;
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ACPI_FUNCTION_TRACE_U32(acpi_read_bit_register, register_id);
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/* Get the info structure corresponding to the requested ACPI Register */
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bit_reg_info = acpi_hw_get_bit_register_info(register_id);
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if (!bit_reg_info) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* Read the entire parent register */
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status = acpi_hw_register_read(bit_reg_info->parent_register,
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®ister_value);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Normalize the value that was read, mask off other bits */
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value = ((register_value & bit_reg_info->access_bit_mask)
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>> bit_reg_info->bit_position);
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ACPI_DEBUG_PRINT((ACPI_DB_IO,
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"BitReg %X, ParentReg %X, Actual %8.8X, ReturnValue %8.8X\n",
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register_id, bit_reg_info->parent_register,
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register_value, value));
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*return_value = value;
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return_ACPI_STATUS(AE_OK);
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}
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ACPI_EXPORT_SYMBOL(acpi_read_bit_register)
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/*******************************************************************************
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*
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* FUNCTION: acpi_write_bit_register
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*
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* PARAMETERS: register_id - ID of ACPI Bit Register to access
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* value - Value to write to the register, in bit
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* position zero. The bit is automatically
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* shifted to the correct position.
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*
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* RETURN: Status
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*
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* DESCRIPTION: ACPI Bit Register write function. Acquires the hardware lock
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* since most operations require a read/modify/write sequence.
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*
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* SUPPORTS: Bit fields in PM1 Status, PM1 Enable, PM1 Control, and
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* PM2 Control.
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*
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* Note that at this level, the fact that there may be actually two
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* hardware registers (A and B - and B may not exist) is abstracted.
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*
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******************************************************************************/
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acpi_status acpi_write_bit_register(u32 register_id, u32 value)
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{
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struct acpi_bit_register_info *bit_reg_info;
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acpi_cpu_flags lock_flags;
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u32 register_value;
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acpi_status status = AE_OK;
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ACPI_FUNCTION_TRACE_U32(acpi_write_bit_register, register_id);
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/* Get the info structure corresponding to the requested ACPI Register */
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bit_reg_info = acpi_hw_get_bit_register_info(register_id);
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if (!bit_reg_info) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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lock_flags = acpi_os_acquire_raw_lock(acpi_gbl_hardware_lock);
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/*
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* At this point, we know that the parent register is one of the
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* following: PM1 Status, PM1 Enable, PM1 Control, or PM2 Control
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*/
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if (bit_reg_info->parent_register != ACPI_REGISTER_PM1_STATUS) {
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/*
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* 1) Case for PM1 Enable, PM1 Control, and PM2 Control
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*
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* Perform a register read to preserve the bits that we are not
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* interested in
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*/
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status = acpi_hw_register_read(bit_reg_info->parent_register,
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®ister_value);
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if (ACPI_FAILURE(status)) {
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goto unlock_and_exit;
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}
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/*
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* Insert the input bit into the value that was just read
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* and write the register
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*/
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ACPI_REGISTER_INSERT_VALUE(register_value,
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bit_reg_info->bit_position,
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bit_reg_info->access_bit_mask,
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value);
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status = acpi_hw_register_write(bit_reg_info->parent_register,
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register_value);
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} else {
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/*
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* 2) Case for PM1 Status
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*
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* The Status register is different from the rest. Clear an event
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* by writing 1, writing 0 has no effect. So, the only relevant
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* information is the single bit we're interested in, all others
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* should be written as 0 so they will be left unchanged.
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*/
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register_value = ACPI_REGISTER_PREPARE_BITS(value,
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bit_reg_info->
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bit_position,
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bit_reg_info->
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access_bit_mask);
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/* No need to write the register if value is all zeros */
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if (register_value) {
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status =
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acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS,
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register_value);
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}
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}
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ACPI_DEBUG_PRINT((ACPI_DB_IO,
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"BitReg %X, ParentReg %X, Value %8.8X, Actual %8.8X\n",
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register_id, bit_reg_info->parent_register, value,
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register_value));
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unlock_and_exit:
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acpi_os_release_raw_lock(acpi_gbl_hardware_lock, lock_flags);
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return_ACPI_STATUS(status);
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}
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ACPI_EXPORT_SYMBOL(acpi_write_bit_register)
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#endif /* !ACPI_REDUCED_HARDWARE */
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/*******************************************************************************
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*
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* FUNCTION: acpi_get_sleep_type_data
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*
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* PARAMETERS: sleep_state - Numeric sleep state
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* *sleep_type_a - Where SLP_TYPa is returned
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* *sleep_type_b - Where SLP_TYPb is returned
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*
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* RETURN: Status
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*
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* DESCRIPTION: Obtain the SLP_TYPa and SLP_TYPb values for the requested
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* sleep state via the appropriate \_Sx object.
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*
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* The sleep state package returned from the corresponding \_Sx_ object
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* must contain at least one integer.
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*
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* March 2005:
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* Added support for a package that contains two integers. This
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* goes against the ACPI specification which defines this object as a
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* package with one encoded DWORD integer. However, existing practice
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* by many BIOS vendors is to return a package with 2 or more integer
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* elements, at least one per sleep type (A/B).
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*
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* January 2013:
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* Therefore, we must be prepared to accept a package with either a
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* single integer or multiple integers.
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*
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* The single integer DWORD format is as follows:
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* BYTE 0 - Value for the PM1A SLP_TYP register
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* BYTE 1 - Value for the PM1B SLP_TYP register
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* BYTE 2-3 - Reserved
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*
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* The dual integer format is as follows:
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* Integer 0 - Value for the PM1A SLP_TYP register
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* Integer 1 - Value for the PM1A SLP_TYP register
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*
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******************************************************************************/
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acpi_status
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acpi_get_sleep_type_data(u8 sleep_state, u8 *sleep_type_a, u8 *sleep_type_b)
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{
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acpi_status status;
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struct acpi_evaluate_info *info;
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union acpi_operand_object **elements;
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ACPI_FUNCTION_TRACE(acpi_get_sleep_type_data);
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/* Validate parameters */
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if ((sleep_state > ACPI_S_STATES_MAX) || !sleep_type_a || !sleep_type_b) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* Allocate the evaluation information block */
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info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
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if (!info) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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/*
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* Evaluate the \_Sx namespace object containing the register values
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* for this state
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*/
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info->relative_pathname = acpi_gbl_sleep_state_names[sleep_state];
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status = acpi_ns_evaluate(info);
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if (ACPI_FAILURE(status)) {
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if (status == AE_NOT_FOUND) {
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/* The _Sx states are optional, ignore NOT_FOUND */
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goto final_cleanup;
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}
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goto warning_cleanup;
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}
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/* Must have a return object */
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if (!info->return_object) {
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ACPI_ERROR((AE_INFO, "No Sleep State object returned from [%s]",
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info->relative_pathname));
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status = AE_AML_NO_RETURN_VALUE;
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|
|
goto warning_cleanup;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Return object must be of type Package */
|
||
|
|
|
||
|
|
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;
|
||
|
|
goto return_value_cleanup;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Any warnings about the package length or the object types have
|
||
|
|
* already been issued by the predefined name module -- there is no
|
||
|
|
* need to repeat them here.
|
||
|
|
*/
|
||
|
|
elements = info->return_object->package.elements;
|
||
|
|
switch (info->return_object->package.count) {
|
||
|
|
case 0:
|
||
|
|
|
||
|
|
status = AE_AML_PACKAGE_LIMIT;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 1:
|
||
|
|
|
||
|
|
if (elements[0]->common.type != ACPI_TYPE_INTEGER) {
|
||
|
|
status = AE_AML_OPERAND_TYPE;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* A valid _Sx_ package with one integer */
|
||
|
|
|
||
|
|
*sleep_type_a = (u8)elements[0]->integer.value;
|
||
|
|
*sleep_type_b = (u8)(elements[0]->integer.value >> 8);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 2:
|
||
|
|
default:
|
||
|
|
|
||
|
|
if ((elements[0]->common.type != ACPI_TYPE_INTEGER) ||
|
||
|
|
(elements[1]->common.type != ACPI_TYPE_INTEGER)) {
|
||
|
|
status = AE_AML_OPERAND_TYPE;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* A valid _Sx_ package with two integers */
|
||
|
|
|
||
|
|
*sleep_type_a = (u8)elements[0]->integer.value;
|
||
|
|
*sleep_type_b = (u8)elements[1]->integer.value;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return_value_cleanup:
|
||
|
|
acpi_ut_remove_reference(info->return_object);
|
||
|
|
|
||
|
|
warning_cleanup:
|
||
|
|
if (ACPI_FAILURE(status)) {
|
||
|
|
ACPI_EXCEPTION((AE_INFO, status,
|
||
|
|
"While evaluating Sleep State [%s]",
|
||
|
|
info->relative_pathname));
|
||
|
|
}
|
||
|
|
|
||
|
|
final_cleanup:
|
||
|
|
ACPI_FREE(info);
|
||
|
|
return_ACPI_STATUS(status);
|
||
|
|
}
|
||
|
|
|
||
|
|
ACPI_EXPORT_SYMBOL(acpi_get_sleep_type_data)
|