/****************************************************************************** * * Module Name: evevent - Fixed Event handling and dispatch * *****************************************************************************/ /* * Copyright (C) 2000 - 2012, 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") /* 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. * ******************************************************************************/ 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 we've got a handler. If not, report an error. The event is * disabled to prevent further interrupts. */ if (NULL == 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 [0x%08X]", 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)); }