354 lines
9.6 KiB
C
354 lines
9.6 KiB
C
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/*******************************************************************************
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*
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* Module Name: hwregs - Read/write access functions for the various ACPI
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* control and status registers.
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*
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******************************************************************************/
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/*
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* Copyright (C) 2000 - 2008, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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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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#include "acevents.h"
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#define _COMPONENT ACPI_HARDWARE
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ACPI_MODULE_NAME("hwregs")
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/*******************************************************************************
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*
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* FUNCTION: acpi_hw_clear_acpi_status
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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: Clears all fixed and general purpose status bits
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* THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED
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*
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******************************************************************************/
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acpi_status acpi_hw_clear_acpi_status(void)
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{
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acpi_status status;
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acpi_cpu_flags lock_flags = 0;
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ACPI_FUNCTION_TRACE(hw_clear_acpi_status);
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ACPI_DEBUG_PRINT((ACPI_DB_IO, "About to write %04X to %04X\n",
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ACPI_BITMASK_ALL_FIXED_STATUS,
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(u16) acpi_gbl_FADT.xpm1a_event_block.address));
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lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
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status = acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS,
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ACPI_BITMASK_ALL_FIXED_STATUS);
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if (ACPI_FAILURE(status)) {
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goto unlock_and_exit;
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}
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/* Clear the fixed events */
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if (acpi_gbl_FADT.xpm1b_event_block.address) {
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status = acpi_write(ACPI_BITMASK_ALL_FIXED_STATUS,
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&acpi_gbl_FADT.xpm1b_event_block);
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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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/* Clear the GPE Bits in all GPE registers in all GPE blocks */
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status = acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block, NULL);
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unlock_and_exit:
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acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_hw_get_register_bit_mask
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*
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* PARAMETERS: register_id - Index of ACPI Register to access
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*
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* RETURN: The bitmask to be used when accessing the register
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*
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* DESCRIPTION: Map register_id into a register bitmask.
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*
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******************************************************************************/
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struct acpi_bit_register_info *acpi_hw_get_bit_register_info(u32 register_id)
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{
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ACPI_FUNCTION_ENTRY();
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if (register_id > ACPI_BITREG_MAX) {
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ACPI_ERROR((AE_INFO, "Invalid BitRegister ID: %X",
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register_id));
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return (NULL);
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}
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return (&acpi_gbl_bit_register_info[register_id]);
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}
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/******************************************************************************
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*
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* FUNCTION: acpi_hw_register_read
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*
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* PARAMETERS: register_id - ACPI Register ID
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* return_value - Where the register value is returned
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*
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* RETURN: Status and the value read.
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*
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* DESCRIPTION: Read from the specified ACPI register
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*
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******************************************************************************/
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acpi_status
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acpi_hw_register_read(u32 register_id, u32 * return_value)
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{
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u32 value1 = 0;
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u32 value2 = 0;
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acpi_status status;
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ACPI_FUNCTION_TRACE(hw_register_read);
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switch (register_id) {
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case ACPI_REGISTER_PM1_STATUS: /* 16-bit access */
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status = acpi_read(&value1, &acpi_gbl_FADT.xpm1a_event_block);
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if (ACPI_FAILURE(status)) {
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goto exit;
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}
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/* PM1B is optional */
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status = acpi_read(&value2, &acpi_gbl_FADT.xpm1b_event_block);
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value1 |= value2;
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break;
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case ACPI_REGISTER_PM1_ENABLE: /* 16-bit access */
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status = acpi_read(&value1, &acpi_gbl_xpm1a_enable);
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if (ACPI_FAILURE(status)) {
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goto exit;
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}
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/* PM1B is optional */
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status = acpi_read(&value2, &acpi_gbl_xpm1b_enable);
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value1 |= value2;
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break;
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case ACPI_REGISTER_PM1_CONTROL: /* 16-bit access */
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status = acpi_read(&value1, &acpi_gbl_FADT.xpm1a_control_block);
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if (ACPI_FAILURE(status)) {
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goto exit;
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}
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status = acpi_read(&value2, &acpi_gbl_FADT.xpm1b_control_block);
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value1 |= value2;
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break;
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case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */
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status = acpi_read(&value1, &acpi_gbl_FADT.xpm2_control_block);
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break;
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case ACPI_REGISTER_PM_TIMER: /* 32-bit access */
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status = acpi_read(&value1, &acpi_gbl_FADT.xpm_timer_block);
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break;
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case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */
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status =
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acpi_os_read_port(acpi_gbl_FADT.smi_command, &value1, 8);
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break;
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default:
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ACPI_ERROR((AE_INFO, "Unknown Register ID: %X", register_id));
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status = AE_BAD_PARAMETER;
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break;
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}
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exit:
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if (ACPI_SUCCESS(status)) {
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*return_value = value1;
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}
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return_ACPI_STATUS(status);
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}
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/******************************************************************************
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*
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* FUNCTION: acpi_hw_register_write
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*
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* PARAMETERS: register_id - ACPI Register ID
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* Value - The value to write
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*
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* RETURN: Status
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*
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* DESCRIPTION: Write to the specified ACPI register
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*
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* NOTE: In accordance with the ACPI specification, this function automatically
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* preserves the value of the following bits, meaning that these bits cannot be
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* changed via this interface:
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*
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* PM1_CONTROL[0] = SCI_EN
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* PM1_CONTROL[9]
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* PM1_STATUS[11]
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*
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* ACPI References:
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* 1) Hardware Ignored Bits: When software writes to a register with ignored
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* bit fields, it preserves the ignored bit fields
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* 2) SCI_EN: OSPM always preserves this bit position
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*
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******************************************************************************/
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acpi_status acpi_hw_register_write(u32 register_id, u32 value)
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{
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acpi_status status;
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u32 read_value;
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ACPI_FUNCTION_TRACE(hw_register_write);
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switch (register_id) {
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case ACPI_REGISTER_PM1_STATUS: /* 16-bit access */
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/* Perform a read first to preserve certain bits (per ACPI spec) */
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status = acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS,
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&read_value);
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if (ACPI_FAILURE(status)) {
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goto exit;
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}
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/* Insert the bits to be preserved */
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ACPI_INSERT_BITS(value, ACPI_PM1_STATUS_PRESERVED_BITS,
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read_value);
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/* Now we can write the data */
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status = acpi_write(value, &acpi_gbl_FADT.xpm1a_event_block);
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if (ACPI_FAILURE(status)) {
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goto exit;
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}
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/* PM1B is optional */
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status = acpi_write(value, &acpi_gbl_FADT.xpm1b_event_block);
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break;
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case ACPI_REGISTER_PM1_ENABLE: /* 16-bit access */
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status = acpi_write(value, &acpi_gbl_xpm1a_enable);
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if (ACPI_FAILURE(status)) {
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goto exit;
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}
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/* PM1B is optional */
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status = acpi_write(value, &acpi_gbl_xpm1b_enable);
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break;
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case ACPI_REGISTER_PM1_CONTROL: /* 16-bit access */
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/*
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* Perform a read first to preserve certain bits (per ACPI spec)
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*/
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status = acpi_hw_register_read(ACPI_REGISTER_PM1_CONTROL,
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&read_value);
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if (ACPI_FAILURE(status)) {
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goto exit;
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}
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/* Insert the bits to be preserved */
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ACPI_INSERT_BITS(value, ACPI_PM1_CONTROL_PRESERVED_BITS,
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read_value);
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/* Now we can write the data */
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status = acpi_write(value, &acpi_gbl_FADT.xpm1a_control_block);
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if (ACPI_FAILURE(status)) {
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goto exit;
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}
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status = acpi_write(value, &acpi_gbl_FADT.xpm1b_control_block);
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break;
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case ACPI_REGISTER_PM1A_CONTROL: /* 16-bit access */
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status = acpi_write(value, &acpi_gbl_FADT.xpm1a_control_block);
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break;
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case ACPI_REGISTER_PM1B_CONTROL: /* 16-bit access */
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status = acpi_write(value, &acpi_gbl_FADT.xpm1b_control_block);
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break;
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case ACPI_REGISTER_PM2_CONTROL: /* 8-bit access */
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status = acpi_write(value, &acpi_gbl_FADT.xpm2_control_block);
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break;
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case ACPI_REGISTER_PM_TIMER: /* 32-bit access */
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status = acpi_write(value, &acpi_gbl_FADT.xpm_timer_block);
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break;
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case ACPI_REGISTER_SMI_COMMAND_BLOCK: /* 8-bit access */
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/* SMI_CMD is currently always in IO space */
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status =
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acpi_os_write_port(acpi_gbl_FADT.smi_command, value, 8);
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break;
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default:
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status = AE_BAD_PARAMETER;
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break;
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}
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exit:
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return_ACPI_STATUS(status);
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}
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