314 lines
8.1 KiB
C
314 lines
8.1 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: evevent - Fixed Event handling and dispatch
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*
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* Copyright (C) 2000 - 2022, Intel Corp.
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*
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*****************************************************************************/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acevents.h"
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#define _COMPONENT ACPI_EVENTS
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ACPI_MODULE_NAME("evevent")
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#if (!ACPI_REDUCED_HARDWARE) /* Entire module */
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/* Local prototypes */
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static acpi_status acpi_ev_fixed_event_initialize(void);
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static u32 acpi_ev_fixed_event_dispatch(u32 event);
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_initialize_events
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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: Initialize global data structures for ACPI events (Fixed, GPE)
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*
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******************************************************************************/
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acpi_status acpi_ev_initialize_events(void)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE(ev_initialize_events);
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/* If Hardware Reduced flag is set, there are no fixed events */
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if (acpi_gbl_reduced_hardware) {
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return_ACPI_STATUS(AE_OK);
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}
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/*
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* Initialize the Fixed and General Purpose Events. This is done prior to
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* enabling SCIs to prevent interrupts from occurring before the handlers
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* are installed.
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*/
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status = acpi_ev_fixed_event_initialize();
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"Unable to initialize fixed events"));
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return_ACPI_STATUS(status);
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}
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status = acpi_ev_gpe_initialize();
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"Unable to initialize general purpose events"));
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return_ACPI_STATUS(status);
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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_ev_install_xrupt_handlers
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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: Install interrupt handlers for the SCI and Global Lock
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*
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******************************************************************************/
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acpi_status acpi_ev_install_xrupt_handlers(void)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE(ev_install_xrupt_handlers);
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/* If Hardware Reduced flag is set, there is no ACPI h/w */
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if (acpi_gbl_reduced_hardware) {
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return_ACPI_STATUS(AE_OK);
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}
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/* Install the SCI handler */
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status = acpi_ev_install_sci_handler();
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"Unable to install System Control Interrupt handler"));
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return_ACPI_STATUS(status);
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}
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/* Install the handler for the Global Lock */
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status = acpi_ev_init_global_lock_handler();
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"Unable to initialize Global Lock handler"));
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return_ACPI_STATUS(status);
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}
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acpi_gbl_events_initialized = TRUE;
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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_ev_fixed_event_initialize
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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: Install the fixed event handlers and disable all fixed events.
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*
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******************************************************************************/
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static acpi_status acpi_ev_fixed_event_initialize(void)
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{
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u32 i;
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acpi_status status;
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/*
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* Initialize the structure that keeps track of fixed event handlers and
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* disable all of the fixed events.
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*/
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for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
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acpi_gbl_fixed_event_handlers[i].handler = NULL;
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acpi_gbl_fixed_event_handlers[i].context = NULL;
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/* Disable the fixed event */
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if (acpi_gbl_fixed_event_info[i].enable_register_id != 0xFF) {
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status =
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acpi_write_bit_register(acpi_gbl_fixed_event_info
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[i].enable_register_id,
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ACPI_DISABLE_EVENT);
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if (ACPI_FAILURE(status)) {
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return (status);
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}
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}
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}
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_fixed_event_detect
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*
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* PARAMETERS: None
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*
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* RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
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*
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* DESCRIPTION: Checks the PM status register for active fixed events
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*
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******************************************************************************/
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u32 acpi_ev_fixed_event_detect(void)
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{
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u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
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u32 fixed_status;
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u32 fixed_enable;
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u32 i;
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acpi_status status;
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ACPI_FUNCTION_NAME(ev_fixed_event_detect);
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/*
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* Read the fixed feature status and enable registers, as all the cases
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* depend on their values. Ignore errors here.
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*/
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status = acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS, &fixed_status);
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status |=
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acpi_hw_register_read(ACPI_REGISTER_PM1_ENABLE, &fixed_enable);
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if (ACPI_FAILURE(status)) {
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return (int_status);
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}
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ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
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"Fixed Event Block: Enable %08X Status %08X\n",
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fixed_enable, fixed_status));
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/*
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* Check for all possible Fixed Events and dispatch those that are active
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*/
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for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
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/* Both the status and enable bits must be on for this event */
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if ((fixed_status & acpi_gbl_fixed_event_info[i].
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status_bit_mask)
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&& (fixed_enable & acpi_gbl_fixed_event_info[i].
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enable_bit_mask)) {
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/*
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* Found an active (signalled) event. Invoke global event
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* handler if present.
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*/
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acpi_fixed_event_count[i]++;
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if (acpi_gbl_global_event_handler) {
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acpi_gbl_global_event_handler
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(ACPI_EVENT_TYPE_FIXED, NULL, i,
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acpi_gbl_global_event_handler_context);
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}
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int_status |= acpi_ev_fixed_event_dispatch(i);
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}
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}
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return (int_status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ev_fixed_event_dispatch
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*
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* PARAMETERS: event - Event type
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*
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* RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
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*
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* DESCRIPTION: Clears the status bit for the requested event, calls the
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* handler that previously registered for the event.
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* NOTE: If there is no handler for the event, the event is
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* disabled to prevent further interrupts.
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*
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******************************************************************************/
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static u32 acpi_ev_fixed_event_dispatch(u32 event)
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{
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ACPI_FUNCTION_ENTRY();
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/* Clear the status bit */
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(void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
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status_register_id, ACPI_CLEAR_STATUS);
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/*
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* Make sure that a handler exists. If not, report an error
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* and disable the event to prevent further interrupts.
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*/
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if (!acpi_gbl_fixed_event_handlers[event].handler) {
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(void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
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enable_register_id,
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ACPI_DISABLE_EVENT);
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ACPI_ERROR((AE_INFO,
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"No installed handler for fixed event - %s (%u), disabling",
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acpi_ut_get_event_name(event), event));
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return (ACPI_INTERRUPT_NOT_HANDLED);
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}
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/* Invoke the Fixed Event handler */
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return ((acpi_gbl_fixed_event_handlers[event].
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handler) (acpi_gbl_fixed_event_handlers[event].context));
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_any_fixed_event_status_set
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*
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* PARAMETERS: None
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*
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* RETURN: TRUE or FALSE
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*
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* DESCRIPTION: Checks the PM status register for active fixed events
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*
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******************************************************************************/
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u32 acpi_any_fixed_event_status_set(void)
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{
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acpi_status status;
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u32 in_status;
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u32 in_enable;
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u32 i;
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status = acpi_hw_register_read(ACPI_REGISTER_PM1_ENABLE, &in_enable);
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if (ACPI_FAILURE(status)) {
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return (FALSE);
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}
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status = acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS, &in_status);
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if (ACPI_FAILURE(status)) {
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return (FALSE);
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}
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/*
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* Check for all possible Fixed Events and dispatch those that are active
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*/
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for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
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/* Both the status and enable bits must be on for this event */
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if ((in_status & acpi_gbl_fixed_event_info[i].status_bit_mask) &&
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(in_enable & acpi_gbl_fixed_event_info[i].enable_bit_mask)) {
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return (TRUE);
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}
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}
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return (FALSE);
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}
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#endif /* !ACPI_REDUCED_HARDWARE */
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