/******************************************************************************
*
* 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")
/* 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");
/* 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 the handlers 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.
*
******************************************************************************/
static 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 active 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.
*
******************************************************************************/
static 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));
}
