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-rw-r--r--drivers/acpi/events/evevent.c297
1 files changed, 297 insertions, 0 deletions
diff --git a/drivers/acpi/events/evevent.c b/drivers/acpi/events/evevent.c
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+++ b/drivers/acpi/events/evevent.c
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+/******************************************************************************
+ *
+ * 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 <acpi/acpi.h>
+#include <acpi/acevents.h>
+
+#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));
+}
+
+
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