1 files changed, 365 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/evxfevnt.c b/drivers/acpi/acpica/evxfevnt.c
new file mode 100644
index 000000000..8187b081e
--- /dev/null
+++ b/drivers/acpi/acpica/evxfevnt.c
@@ -0,0 +1,365 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Module Name: evxfevnt - External Interfaces, ACPI event disable/enable
+ *
+ * Copyright (C) 2000 - 2022, Intel Corp.
+ *
+ *****************************************************************************/
+
+#define EXPORT_ACPI_INTERFACES
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "actables.h"
+
+#define _COMPONENT          ACPI_EVENTS
+ACPI_MODULE_NAME("evxfevnt")
+
+#if (!ACPI_REDUCED_HARDWARE)	/* Entire module */
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_enable
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Transfers the system into ACPI mode.
+ *
+ ******************************************************************************/
+acpi_status acpi_enable(void)
+{
+	acpi_status status;
+	int retry;
+
+	ACPI_FUNCTION_TRACE(acpi_enable);
+
+	/* ACPI tables must be present */
+
+	if (acpi_gbl_fadt_index == ACPI_INVALID_TABLE_INDEX) {
+		return_ACPI_STATUS(AE_NO_ACPI_TABLES);
+	}
+
+	/* If the Hardware Reduced flag is set, machine is always in acpi mode */
+
+	if (acpi_gbl_reduced_hardware) {
+		return_ACPI_STATUS(AE_OK);
+	}
+
+	/* Check current mode */
+
+	if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INIT,
+				  "System is already in ACPI mode\n"));
+		return_ACPI_STATUS(AE_OK);
+	}
+
+	/* Transition to ACPI mode */
+
+	status = acpi_hw_set_mode(ACPI_SYS_MODE_ACPI);
+	if (ACPI_FAILURE(status)) {
+		ACPI_ERROR((AE_INFO,
+			    "Could not transition to ACPI mode"));
+		return_ACPI_STATUS(status);
+	}
+
+	/* Sanity check that transition succeeded */
+
+	for (retry = 0; retry < 30000; ++retry) {
+		if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) {
+			if (retry != 0)
+				ACPI_WARNING((AE_INFO,
+				"Platform took > %d00 usec to enter ACPI mode", retry));
+			return_ACPI_STATUS(AE_OK);
+		}
+		acpi_os_stall(100);	/* 100 usec */
+	}
+
+	ACPI_ERROR((AE_INFO, "Hardware did not enter ACPI mode"));
+	return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_enable)
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_disable
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Transfers the system into LEGACY (non-ACPI) mode.
+ *
+ ******************************************************************************/
+acpi_status acpi_disable(void)
+{
+	acpi_status status = AE_OK;
+
+	ACPI_FUNCTION_TRACE(acpi_disable);
+
+	/* If the Hardware Reduced flag is set, machine is always in acpi mode */
+
+	if (acpi_gbl_reduced_hardware) {
+		return_ACPI_STATUS(AE_OK);
+	}
+
+	if (acpi_hw_get_mode() == ACPI_SYS_MODE_LEGACY) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INIT,
+				  "System is already in legacy (non-ACPI) mode\n"));
+	} else {
+		/* Transition to LEGACY mode */
+
+		status = acpi_hw_set_mode(ACPI_SYS_MODE_LEGACY);
+
+		if (ACPI_FAILURE(status)) {
+			ACPI_ERROR((AE_INFO,
+				    "Could not exit ACPI mode to legacy mode"));
+			return_ACPI_STATUS(status);
+		}
+
+		ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI mode disabled\n"));
+	}
+
+	return_ACPI_STATUS(status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_disable)
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_enable_event
+ *
+ * PARAMETERS:  event           - The fixed eventto be enabled
+ *              flags           - Reserved
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Enable an ACPI event (fixed)
+ *
+ ******************************************************************************/
+acpi_status acpi_enable_event(u32 event, u32 flags)
+{
+	acpi_status status = AE_OK;
+	u32 value;
+
+	ACPI_FUNCTION_TRACE(acpi_enable_event);
+
+	/* If Hardware Reduced flag is set, there are no fixed events */
+
+	if (acpi_gbl_reduced_hardware) {
+		return_ACPI_STATUS(AE_OK);
+	}
+
+	/* Decode the Fixed Event */
+
+	if (event > ACPI_EVENT_MAX) {
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	}
+
+	/*
+	 * Enable the requested fixed event (by writing a one to the enable
+	 * register bit)
+	 */
+	status =
+	    acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
+				    enable_register_id, ACPI_ENABLE_EVENT);
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	/* Make sure that the hardware responded */
+
+	status =
+	    acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
+				   enable_register_id, &value);
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	if (value != 1) {
+		ACPI_ERROR((AE_INFO,
+			    "Could not enable %s event",
+			    acpi_ut_get_event_name(event)));
+		return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
+	}
+
+	return_ACPI_STATUS(status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_enable_event)
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_disable_event
+ *
+ * PARAMETERS:  event           - The fixed event to be disabled
+ *              flags           - Reserved
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Disable an ACPI event (fixed)
+ *
+ ******************************************************************************/
+acpi_status acpi_disable_event(u32 event, u32 flags)
+{
+	acpi_status status = AE_OK;
+	u32 value;
+
+	ACPI_FUNCTION_TRACE(acpi_disable_event);
+
+	/* If Hardware Reduced flag is set, there are no fixed events */
+
+	if (acpi_gbl_reduced_hardware) {
+		return_ACPI_STATUS(AE_OK);
+	}
+
+	/* Decode the Fixed Event */
+
+	if (event > ACPI_EVENT_MAX) {
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	}
+
+	/*
+	 * Disable the requested fixed event (by writing a zero to the enable
+	 * register bit)
+	 */
+	status =
+	    acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
+				    enable_register_id, ACPI_DISABLE_EVENT);
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	status =
+	    acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
+				   enable_register_id, &value);
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	if (value != 0) {
+		ACPI_ERROR((AE_INFO,
+			    "Could not disable %s events",
+			    acpi_ut_get_event_name(event)));
+		return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
+	}
+
+	return_ACPI_STATUS(status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_disable_event)
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_clear_event
+ *
+ * PARAMETERS:  event           - The fixed event to be cleared
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Clear an ACPI event (fixed)
+ *
+ ******************************************************************************/
+acpi_status acpi_clear_event(u32 event)
+{
+	acpi_status status = AE_OK;
+
+	ACPI_FUNCTION_TRACE(acpi_clear_event);
+
+	/* If Hardware Reduced flag is set, there are no fixed events */
+
+	if (acpi_gbl_reduced_hardware) {
+		return_ACPI_STATUS(AE_OK);
+	}
+
+	/* Decode the Fixed Event */
+
+	if (event > ACPI_EVENT_MAX) {
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	}
+
+	/*
+	 * Clear the requested fixed event (By writing a one to the status
+	 * register bit)
+	 */
+	status =
+	    acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
+				    status_register_id, ACPI_CLEAR_STATUS);
+
+	return_ACPI_STATUS(status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_clear_event)
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_get_event_status
+ *
+ * PARAMETERS:  event           - The fixed event
+ *              event_status    - Where the current status of the event will
+ *                                be returned
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Obtains and returns the current status of the event
+ *
+ ******************************************************************************/
+acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status)
+{
+	acpi_status status;
+	acpi_event_status local_event_status = 0;
+	u32 in_byte;
+
+	ACPI_FUNCTION_TRACE(acpi_get_event_status);
+
+	if (!event_status) {
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	}
+
+	/* Decode the Fixed Event */
+
+	if (event > ACPI_EVENT_MAX) {
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	}
+
+	/* Fixed event currently can be dispatched? */
+
+	if (acpi_gbl_fixed_event_handlers[event].handler) {
+		local_event_status |= ACPI_EVENT_FLAG_HAS_HANDLER;
+	}
+
+	/* Fixed event currently enabled? */
+
+	status =
+	    acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
+				   enable_register_id, &in_byte);
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	if (in_byte) {
+		local_event_status |=
+		    (ACPI_EVENT_FLAG_ENABLED | ACPI_EVENT_FLAG_ENABLE_SET);
+	}
+
+	/* Fixed event currently active? */
+
+	status =
+	    acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
+				   status_register_id, &in_byte);
+	if (ACPI_FAILURE(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	if (in_byte) {
+		local_event_status |= ACPI_EVENT_FLAG_STATUS_SET;
+	}
+
+	(*event_status) = local_event_status;
+	return_ACPI_STATUS(AE_OK);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_get_event_status)
+#endif				/* !ACPI_REDUCED_HARDWARE */