50df4d8b0f
acpi.h now includes only the "public" acpica headers. All other acpica headers are "private" and should not be included by acpica users. One new file, accommon.h is used to include the commonly used private headers for acpica code generation. Future plans are to move all private headers to a new subdirectory. Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Lin Ming <ming.m.lin@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
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 <acpi/accommon.h>
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#include <acpi/acnamesp.h>
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#include <acpi/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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