evsci.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:7k
- /*******************************************************************************
- *
- * Module Name: evsci - System Control Interrupt configuration and
- * legacy to ACPI mode state transition functions
- * $Revision: 74 $
- *
- ******************************************************************************/
- /*
- * Copyright (C) 2000, 2001 R. Byron Moore
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #include "acpi.h"
- #include "acnamesp.h"
- #include "achware.h"
- #include "acevents.h"
- #define _COMPONENT ACPI_EVENTS
- MODULE_NAME ("evsci")
- /*
- * Elements correspond to counts for TMR, NOT_USED, GBL, PWR_BTN, SLP_BTN, RTC,
- * and GENERAL respectively. These counts are modified by the ACPI interrupt
- * handler.
- *
- * TBD: [Investigate] Note that GENERAL should probably be split out into
- * one element for each bit in the GPE registers
- */
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ev_sci_handler
- *
- * PARAMETERS: Context - Calling Context
- *
- * RETURN: Status code indicates whether interrupt was handled.
- *
- * DESCRIPTION: Interrupt handler that will figure out what function or
- * control method to call to deal with a SCI. Installed
- * using BU interrupt support.
- *
- ******************************************************************************/
- static u32
- acpi_ev_sci_handler (void *context)
- {
- u32 interrupt_handled = INTERRUPT_NOT_HANDLED;
- FUNCTION_TRACE("Ev_sci_handler");
- /*
- * Make sure that ACPI is enabled by checking SCI_EN. Note that we are
- * required to treat the SCI interrupt as sharable, level, active low.
- */
- if (!acpi_hw_register_bit_access (ACPI_READ, ACPI_MTX_DO_NOT_LOCK, SCI_EN)) {
- /* ACPI is not enabled; this interrupt cannot be for us */
- return_VALUE (INTERRUPT_NOT_HANDLED);
- }
- /*
- * Fixed Acpi_events:
- * -------------
- * Check for and dispatch any Fixed Acpi_events that have occurred
- */
- interrupt_handled |= acpi_ev_fixed_event_detect ();
- /*
- * GPEs:
- * -----
- * Check for and dispatch any GPEs that have occurred
- */
- interrupt_handled |= acpi_ev_gpe_detect ();
- return_VALUE (interrupt_handled);
- }
- /******************************************************************************
- *
- * FUNCTION: Acpi_ev_install_sci_handler
- *
- * PARAMETERS: none
- *
- * RETURN: Status
- *
- * DESCRIPTION: Installs SCI handler.
- *
- ******************************************************************************/
- u32
- acpi_ev_install_sci_handler (void)
- {
- u32 status = AE_OK;
- FUNCTION_TRACE ("Ev_install_sci_handler");
- status = acpi_os_install_interrupt_handler ((u32) acpi_gbl_FADT->sci_int,
- acpi_ev_sci_handler, NULL);
- return_ACPI_STATUS (status);
- }
- /******************************************************************************
- *
- * FUNCTION: Acpi_ev_remove_sci_handler
- *
- * PARAMETERS: none
- *
- * RETURN: E_OK if handler uninstalled OK, E_ERROR if handler was not
- * installed to begin with
- *
- * DESCRIPTION: Restores original status of all fixed event enable bits and
- * removes SCI handler.
- *
- ******************************************************************************/
- acpi_status
- acpi_ev_remove_sci_handler (void)
- {
- FUNCTION_TRACE ("Ev_remove_sci_handler");
- #if 0
- /* TBD:[Investigate] Figure this out!! Disable all events first ??? */
- if (original_fixed_enable_bit_status ^ 1 << acpi_event_index (TMR_FIXED_EVENT)) {
- acpi_event_disable_event (TMR_FIXED_EVENT);
- }
- if (original_fixed_enable_bit_status ^ 1 << acpi_event_index (GBL_FIXED_EVENT)) {
- acpi_event_disable_event (GBL_FIXED_EVENT);
- }
- if (original_fixed_enable_bit_status ^ 1 << acpi_event_index (PWR_BTN_FIXED_EVENT)) {
- acpi_event_disable_event (PWR_BTN_FIXED_EVENT);
- }
- if (original_fixed_enable_bit_status ^ 1 << acpi_event_index (SLP_BTN_FIXED_EVENT)) {
- acpi_event_disable_event (SLP_BTN_FIXED_EVENT);
- }
- if (original_fixed_enable_bit_status ^ 1 << acpi_event_index (RTC_FIXED_EVENT)) {
- acpi_event_disable_event (RTC_FIXED_EVENT);
- }
- original_fixed_enable_bit_status = 0;
- #endif
- acpi_os_remove_interrupt_handler ((u32) acpi_gbl_FADT->sci_int,
- acpi_ev_sci_handler);
- return_ACPI_STATUS (AE_OK);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ev_restore_acpi_state
- *
- * PARAMETERS: none
- *
- * RETURN: none
- *
- * DESCRIPTION: Restore the original ACPI state of the machine
- *
- ******************************************************************************/
- void
- acpi_ev_restore_acpi_state (void)
- {
- u32 index;
- FUNCTION_TRACE ("Ev_restore_acpi_state");
- /* Restore the state of the chipset enable bits. */
- if (acpi_gbl_restore_acpi_chipset == TRUE) {
- /* Restore the fixed events */
- if (acpi_hw_register_read (ACPI_MTX_LOCK, PM1_EN) !=
- acpi_gbl_pm1_enable_register_save) {
- acpi_hw_register_write (ACPI_MTX_LOCK, PM1_EN,
- acpi_gbl_pm1_enable_register_save);
- }
- /* Ensure that all status bits are clear */
- acpi_hw_clear_acpi_status ();
- /* Now restore the GPEs */
- for (index = 0; index < DIV_2 (acpi_gbl_FADT->gpe0blk_len); index++) {
- if (acpi_hw_register_read (ACPI_MTX_LOCK, GPE0_EN_BLOCK | index) !=
- acpi_gbl_gpe0enable_register_save[index]) {
- acpi_hw_register_write (ACPI_MTX_LOCK, GPE0_EN_BLOCK | index,
- acpi_gbl_gpe0enable_register_save[index]);
- }
- }
- /* GPE 1 present? */
- if (acpi_gbl_FADT->gpe1_blk_len) {
- for (index = 0; index < DIV_2 (acpi_gbl_FADT->gpe1_blk_len); index++) {
- if (acpi_hw_register_read (ACPI_MTX_LOCK, GPE1_EN_BLOCK | index) !=
- acpi_gbl_gpe1_enable_register_save[index]) {
- acpi_hw_register_write (ACPI_MTX_LOCK, GPE1_EN_BLOCK | index,
- acpi_gbl_gpe1_enable_register_save[index]);
- }
- }
- }
- if (acpi_hw_get_mode() != acpi_gbl_original_mode) {
- acpi_hw_set_mode (acpi_gbl_original_mode);
- }
- }
- return_VOID;
- }
- /******************************************************************************
- *
- * FUNCTION: Acpi_ev_terminate
- *
- * PARAMETERS: none
- *
- * RETURN: none
- *
- * DESCRIPTION: free memory allocated for table storage.
- *
- ******************************************************************************/
- void
- acpi_ev_terminate (void)
- {
- FUNCTION_TRACE ("Ev_terminate");
- /*
- * Free global tables, etc.
- */
- if (acpi_gbl_gpe_registers) {
- ACPI_MEM_FREE (acpi_gbl_gpe_registers);
- }
- if (acpi_gbl_gpe_info) {
- ACPI_MEM_FREE (acpi_gbl_gpe_info);
- }
- return_VOID;
- }