// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/*******************************************************************************
*
* Module Name: evsci - System Control Interrupt configuration and
* legacy to ACPI mode state transition functions
*
******************************************************************************/
#include <acpi/acpi.h>
#include "accommon.h"
#include "acevents.h"
#define _COMPONENT ACPI_EVENTS
ACPI_MODULE_NAME(
"evsci")
#if (!ACPI_REDUCED_HARDWARE)
/* Entire module */
/* Local prototypes */
static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(
void *context);
/*******************************************************************************
*
* FUNCTION: acpi_ev_sci_dispatch
*
* PARAMETERS: None
*
* RETURN: Status code indicates whether interrupt was handled.
*
* DESCRIPTION: Dispatch the SCI to all host-installed SCI handlers.
*
******************************************************************************/
u32 acpi_ev_sci_dispatch(
void)
{
struct acpi_sci_handler_info *sci_handler;
acpi_cpu_flags flags;
u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
ACPI_FUNCTION_NAME(ev_sci_dispatch);
/* Are there any host-installed SCI handlers? */
if (!acpi_gbl_sci_handler_list) {
return (int_status);
}
flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
/* Invoke all host-installed SCI handlers */
sci_handler = acpi_gbl_sci_handler_list;
while (sci_handler) {
/* Invoke the installed handler (at interrupt level) */
int_status |= sci_handler->address(sci_handler->context);
sci_handler = sci_handler->next;
}
acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
return (int_status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_sci_xrupt_handler
*
* PARAMETERS: context - Calling Context
*
* RETURN: Status code indicates whether interrupt was handled.
*
* DESCRIPTION: Interrupt handler that will figure out what function or
* control method to call to deal with a SCI.
*
******************************************************************************/
static u32 ACPI_SYSTEM_XFACE acpi_ev_sci_xrupt_handler(
void *context)
{
struct acpi_gpe_xrupt_info *gpe_xrupt_list = context;
u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;
ACPI_FUNCTION_TRACE(ev_sci_xrupt_handler);
/*
* We are guaranteed by the ACPICA initialization/shutdown code that
* if this interrupt handler is installed, ACPI is enabled.
*/
/*
* Fixed Events:
* Check for and dispatch any Fixed Events that have occurred
*/
interrupt_handled |= acpi_ev_fixed_event_detect();
/*
* General Purpose Events:
* Check for and dispatch any GPEs that have occurred
*/
interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list);
/* Invoke all host-installed SCI handlers */
interrupt_handled |= acpi_ev_sci_dispatch();
acpi_sci_count++;
return_UINT32(interrupt_handled);
}
/*******************************************************************************
*
* FUNCTION: acpi_ev_gpe_xrupt_handler
*
* PARAMETERS: context - Calling Context
*
* RETURN: Status code indicates whether interrupt was handled.
*
* DESCRIPTION: Handler for GPE Block Device interrupts
*
******************************************************************************/
u32 ACPI_SYSTEM_XFACE acpi_ev_gpe_xrupt_handler(
void *context)
{
struct acpi_gpe_xrupt_info *gpe_xrupt_list = context;
u32 interrupt_handled = ACPI_INTERRUPT_NOT_HANDLED;
ACPI_FUNCTION_TRACE(ev_gpe_xrupt_handler);
/*
* We are guaranteed by the ACPICA initialization/shutdown code that
* if this interrupt handler is installed, ACPI is enabled.
*/
/* GPEs: Check for and dispatch any GPEs that have occurred */
interrupt_handled |= acpi_ev_gpe_detect(gpe_xrupt_list);
return_UINT32(interrupt_handled);
}
/******************************************************************************
*
* FUNCTION: acpi_ev_install_sci_handler
*
* PARAMETERS: none
*
* RETURN: Status
*
* DESCRIPTION: Installs SCI handler.
*
******************************************************************************/
u32 acpi_ev_install_sci_handler(
void)
{
u32 status = AE_OK;
ACPI_FUNCTION_TRACE(ev_install_sci_handler);
status =
acpi_os_install_interrupt_handler((u32) acpi_gbl_FADT.sci_interrupt,
acpi_ev_sci_xrupt_handler,
acpi_gbl_gpe_xrupt_list_head);
return_ACPI_STATUS(status);
}
/******************************************************************************
*
* FUNCTION: acpi_ev_remove_all_sci_handlers
*
* PARAMETERS: none
*
* RETURN: AE_OK if handler uninstalled, AE_ERROR if handler was not
* installed to begin with
*
* DESCRIPTION: Remove the SCI interrupt handler. No further SCIs will be
* taken. Remove all host-installed SCI handlers.
*
* Note: It doesn't seem important to disable all events or set the event
* enable registers to their original values. The OS should disable
* the SCI interrupt level when the handler is removed, so no more
* events will come in.
*
******************************************************************************/
acpi_status acpi_ev_remove_all_sci_handlers(
void)
{
struct acpi_sci_handler_info *sci_handler;
acpi_cpu_flags flags;
acpi_status status;
ACPI_FUNCTION_TRACE(ev_remove_all_sci_handlers);
/* Just let the OS remove the handler and disable the level */
status =
acpi_os_remove_interrupt_handler((u32) acpi_gbl_FADT.sci_interrupt,
acpi_ev_sci_xrupt_handler);
if (!acpi_gbl_sci_handler_list) {
return (status);
}
flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
/* Free all host-installed SCI handlers */
while (acpi_gbl_sci_handler_list) {
sci_handler = acpi_gbl_sci_handler_list;
acpi_gbl_sci_handler_list = sci_handler->next;
ACPI_FREE(sci_handler);
}
acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
return_ACPI_STATUS(status);
}
#endif /* !ACPI_REDUCED_HARDWARE */
