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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
*
* Module Name: evevent - Fixed Event handling and dispatch
*
* Copyright (C) 2000 - 2020, Intel Corp.
*
*****************************************************************************/
#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_status status;
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.
*/
status = acpi_hw_register_read(ACPI_REGISTER_PM1_STATUS, &fixed_status);
status |=
acpi_hw_register_read(ACPI_REGISTER_PM1_ENABLE, &fixed_enable);
if (ACPI_FAILURE(status)) {
return (int_status);
}
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 */
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