| /****************************************************************************** |
| * |
| * Module Name: evevent - Fixed Event handling and dispatch |
| * |
| *****************************************************************************/ |
| |
| /* |
| * Copyright (C) 2000 - 2014, Intel Corp. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions, and the following disclaimer, |
| * without modification. |
| * 2. Redistributions in binary form must reproduce at minimum a disclaimer |
| * substantially similar to the "NO WARRANTY" disclaimer below |
| * ("Disclaimer") and any redistribution must be conditioned upon |
| * including a substantially similar Disclaimer requirement for further |
| * binary redistribution. |
| * 3. Neither the names of the above-listed copyright holders nor the names |
| * of any contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * Alternatively, this software may be distributed under the terms of the |
| * GNU General Public License ("GPL") version 2 as published by the Free |
| * Software Foundation. |
| * |
| * NO WARRANTY |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGES. |
| */ |
| |
| #include <acpi/acpi.h> |
| #include "accommon.h" |
| #include "acevents.h" |
| |
| #define _COMPONENT ACPI_EVENTS |
| ACPI_MODULE_NAME("evevent") |
| #if (!ACPI_REDUCED_HARDWARE) /* Entire module */ |
| /* Local prototypes */ |
| static acpi_status acpi_ev_fixed_event_initialize(void); |
| |
| static u32 acpi_ev_fixed_event_dispatch(u32 event); |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ev_initialize_events |
| * |
| * PARAMETERS: None |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Initialize global data structures for ACPI events (Fixed, GPE) |
| * |
| ******************************************************************************/ |
| |
| acpi_status acpi_ev_initialize_events(void) |
| { |
| acpi_status status; |
| |
| ACPI_FUNCTION_TRACE(ev_initialize_events); |
| |
| /* If Hardware Reduced flag is set, there are no fixed events */ |
| |
| if (acpi_gbl_reduced_hardware) { |
| return_ACPI_STATUS(AE_OK); |
| } |
| |
| /* |
| * Initialize the Fixed and General Purpose Events. This is done prior to |
| * enabling SCIs to prevent interrupts from occurring before the handlers |
| * are installed. |
| */ |
| status = acpi_ev_fixed_event_initialize(); |
| if (ACPI_FAILURE(status)) { |
| ACPI_EXCEPTION((AE_INFO, status, |
| "Unable to initialize fixed events")); |
| return_ACPI_STATUS(status); |
| } |
| |
| status = acpi_ev_gpe_initialize(); |
| if (ACPI_FAILURE(status)) { |
| ACPI_EXCEPTION((AE_INFO, status, |
| "Unable to initialize general purpose events")); |
| return_ACPI_STATUS(status); |
| } |
| |
| return_ACPI_STATUS(status); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ev_install_xrupt_handlers |
| * |
| * PARAMETERS: None |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Install interrupt handlers for the SCI and Global Lock |
| * |
| ******************************************************************************/ |
| |
| acpi_status acpi_ev_install_xrupt_handlers(void) |
| { |
| acpi_status status; |
| |
| ACPI_FUNCTION_TRACE(ev_install_xrupt_handlers); |
| |
| /* If Hardware Reduced flag is set, there is no ACPI h/w */ |
| |
| if (acpi_gbl_reduced_hardware) { |
| return_ACPI_STATUS(AE_OK); |
| } |
| |
| /* Install the SCI handler */ |
| |
| status = acpi_ev_install_sci_handler(); |
| if (ACPI_FAILURE(status)) { |
| ACPI_EXCEPTION((AE_INFO, status, |
| "Unable to install System Control Interrupt handler")); |
| return_ACPI_STATUS(status); |
| } |
| |
| /* Install the handler for the Global Lock */ |
| |
| status = acpi_ev_init_global_lock_handler(); |
| if (ACPI_FAILURE(status)) { |
| ACPI_EXCEPTION((AE_INFO, status, |
| "Unable to initialize Global Lock handler")); |
| return_ACPI_STATUS(status); |
| } |
| |
| acpi_gbl_events_initialized = TRUE; |
| return_ACPI_STATUS(status); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ev_fixed_event_initialize |
| * |
| * PARAMETERS: None |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Install the fixed event handlers and disable all fixed events. |
| * |
| ******************************************************************************/ |
| |
| static acpi_status acpi_ev_fixed_event_initialize(void) |
| { |
| u32 i; |
| acpi_status status; |
| |
| /* |
| * Initialize the structure that keeps track of fixed event handlers and |
| * enable the fixed events. |
| */ |
| for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) { |
| acpi_gbl_fixed_event_handlers[i].handler = NULL; |
| acpi_gbl_fixed_event_handlers[i].context = NULL; |
| |
| /* Disable the fixed event */ |
| |
| if (acpi_gbl_fixed_event_info[i].enable_register_id != 0xFF) { |
| status = |
| acpi_write_bit_register(acpi_gbl_fixed_event_info |
| [i].enable_register_id, |
| ACPI_DISABLE_EVENT); |
| if (ACPI_FAILURE(status)) { |
| return (status); |
| } |
| } |
| } |
| |
| return (AE_OK); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ev_fixed_event_detect |
| * |
| * PARAMETERS: None |
| * |
| * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED |
| * |
| * DESCRIPTION: Checks the PM status register for active fixed events |
| * |
| ******************************************************************************/ |
| |
| u32 acpi_ev_fixed_event_detect(void) |
| { |
| u32 int_status = ACPI_INTERRUPT_NOT_HANDLED; |
| u32 fixed_status; |
| u32 fixed_enable; |
| u32 i; |
| |
| ACPI_FUNCTION_NAME(ev_fixed_event_detect); |
| |
| /* |
| * Read the fixed feature status and enable registers, as all the cases |
| * depend on their values. Ignore errors here. |
| */ |
| (void)acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS, &fixed_status); |
| (void)acpi_hw_register_read(ACPI_REGISTER_PM1_ENABLE, &fixed_enable); |
| |
| ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS, |
| "Fixed Event Block: Enable %08X Status %08X\n", |
| fixed_enable, fixed_status)); |
| |
| /* |
| * Check for all possible Fixed Events and dispatch those that are active |
| */ |
| for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) { |
| |
| /* Both the status and enable bits must be on for this event */ |
| |
| if ((fixed_status & acpi_gbl_fixed_event_info[i]. |
| status_bit_mask) |
| && (fixed_enable & acpi_gbl_fixed_event_info[i]. |
| enable_bit_mask)) { |
| /* |
| * Found an active (signalled) event. Invoke global event |
| * handler if present. |
| */ |
| acpi_fixed_event_count[i]++; |
| if (acpi_gbl_global_event_handler) { |
| acpi_gbl_global_event_handler |
| (ACPI_EVENT_TYPE_FIXED, NULL, i, |
| acpi_gbl_global_event_handler_context); |
| } |
| |
| int_status |= acpi_ev_fixed_event_dispatch(i); |
| } |
| } |
| |
| return (int_status); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_ev_fixed_event_dispatch |
| * |
| * PARAMETERS: event - Event type |
| * |
| * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED |
| * |
| * DESCRIPTION: Clears the status bit for the requested event, calls the |
| * handler that previously registered for the event. |
| * NOTE: If there is no handler for the event, the event is |
| * disabled to prevent further interrupts. |
| * |
| ******************************************************************************/ |
| |
| static u32 acpi_ev_fixed_event_dispatch(u32 event) |
| { |
| |
| ACPI_FUNCTION_ENTRY(); |
| |
| /* Clear the status bit */ |
| |
| (void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. |
| status_register_id, ACPI_CLEAR_STATUS); |
| |
| /* |
| * Make sure that a handler exists. If not, report an error |
| * and disable the event to prevent further interrupts. |
| */ |
| if (!acpi_gbl_fixed_event_handlers[event].handler) { |
| (void)acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. |
| enable_register_id, |
| ACPI_DISABLE_EVENT); |
| |
| ACPI_ERROR((AE_INFO, |
| "No installed handler for fixed event - %s (%u), disabling", |
| acpi_ut_get_event_name(event), event)); |
| |
| return (ACPI_INTERRUPT_NOT_HANDLED); |
| } |
| |
| /* Invoke the Fixed Event handler */ |
| |
| return ((acpi_gbl_fixed_event_handlers[event]. |
| handler) (acpi_gbl_fixed_event_handlers[event].context)); |
| } |
| |
| #endif /* !ACPI_REDUCED_HARDWARE */ |