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313 lines
8.1 KiB
313 lines
8.1 KiB
// 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 - 2021, 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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