/****************************************************************************** * * Module Name: evevent - Fixed Event handling and dispatch * *****************************************************************************/ /* * Copyright (C) 2000 - 2005, R. Byron Moore * 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 #include #define _COMPONENT ACPI_EVENTS ACPI_MODULE_NAME ("evevent") /******************************************************************************* * * FUNCTION: acpi_ev_initialize_events * * PARAMETERS: None * * RETURN: Status * * DESCRIPTION: Initialize global data structures for events. * ******************************************************************************/ acpi_status acpi_ev_initialize_events ( void) { acpi_status status; ACPI_FUNCTION_TRACE ("ev_initialize_events"); /* Make sure we have ACPI tables */ if (!acpi_gbl_DSDT) { ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "No ACPI tables present!\n")); return_ACPI_STATUS (AE_NO_ACPI_TABLES); } /* * Initialize the Fixed and General Purpose Events. This is * done prior to enabling SCIs to prevent interrupts from * occurring before handers are installed. */ status = acpi_ev_fixed_event_initialize (); if (ACPI_FAILURE (status)) { ACPI_REPORT_ERROR (( "Unable to initialize fixed events, %s\n", acpi_format_exception (status))); return_ACPI_STATUS (status); } status = acpi_ev_gpe_initialize (); if (ACPI_FAILURE (status)) { ACPI_REPORT_ERROR (( "Unable to initialize general purpose events, %s\n", acpi_format_exception (status))); 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"); /* Install the SCI handler */ status = acpi_ev_install_sci_handler (); if (ACPI_FAILURE (status)) { ACPI_REPORT_ERROR (( "Unable to install System Control Interrupt Handler, %s\n", acpi_format_exception (status))); return_ACPI_STATUS (status); } /* Install the handler for the Global Lock */ status = acpi_ev_init_global_lock_handler (); if (ACPI_FAILURE (status)) { ACPI_REPORT_ERROR (( "Unable to initialize Global Lock handler, %s\n", acpi_format_exception (status))); 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 enable the fixed events. * ******************************************************************************/ acpi_status acpi_ev_fixed_event_initialize ( void) { acpi_native_uint 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; /* Enable the fixed event */ if (acpi_gbl_fixed_event_info[i].enable_register_id != 0xFF) { status = acpi_set_register (acpi_gbl_fixed_event_info[i].enable_register_id, 0, ACPI_MTX_LOCK); 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 fixed events * ******************************************************************************/ u32 acpi_ev_fixed_event_detect ( void) { u32 int_status = ACPI_INTERRUPT_NOT_HANDLED; u32 fixed_status; u32 fixed_enable; acpi_native_uint 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_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1_STATUS, &fixed_status); (void) acpi_hw_register_read (ACPI_MTX_DO_NOT_LOCK, 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 */ int_status |= acpi_ev_fixed_event_dispatch ((u32) 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. * ******************************************************************************/ u32 acpi_ev_fixed_event_dispatch ( u32 event) { ACPI_FUNCTION_ENTRY (); /* Clear the status bit */ (void) acpi_set_register (acpi_gbl_fixed_event_info[event].status_register_id, 1, ACPI_MTX_DO_NOT_LOCK); /* * 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_set_register (acpi_gbl_fixed_event_info[event].enable_register_id, 0, ACPI_MTX_DO_NOT_LOCK); ACPI_REPORT_ERROR ( ("No installed handler for fixed event [%08X]\n", 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)); }