Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 147 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/hwacpi.c b/drivers/acpi/acpica/hwacpi.c
new file mode 100644
index 000000000..525e6ea5c
--- /dev/null
+++ b/drivers/acpi/acpica/hwacpi.c
@@ -0,0 +1,147 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface
+ *
+ * Copyright (C) 2000 - 2018, Intel Corp.
+ *
+ *****************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+
+#define _COMPONENT          ACPI_HARDWARE
+ACPI_MODULE_NAME("hwacpi")
+
+#if (!ACPI_REDUCED_HARDWARE)	/* Entire module */
+/******************************************************************************
+ *
+ * FUNCTION:    acpi_hw_set_mode
+ *
+ * PARAMETERS:  mode            - SYS_MODE_ACPI or SYS_MODE_LEGACY
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Transitions the system into the requested mode.
+ *
+ ******************************************************************************/
+acpi_status acpi_hw_set_mode(u32 mode)
+{
+
+	acpi_status status;
+
+	ACPI_FUNCTION_TRACE(hw_set_mode);
+
+	/* If the Hardware Reduced flag is set, machine is always in acpi mode */
+
+	if (acpi_gbl_reduced_hardware) {
+		return_ACPI_STATUS(AE_OK);
+	}
+
+	/*
+	 * ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
+	 * system does not support mode transition.
+	 */
+	if (!acpi_gbl_FADT.smi_command) {
+		ACPI_ERROR((AE_INFO,
+			    "No SMI_CMD in FADT, mode transition failed"));
+		return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
+	}
+
+	/*
+	 * ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE
+	 * in FADT: If it is zero, enabling or disabling is not supported.
+	 * As old systems may have used zero for mode transition,
+	 * we make sure both the numbers are zero to determine these
+	 * transitions are not supported.
+	 */
+	if (!acpi_gbl_FADT.acpi_enable && !acpi_gbl_FADT.acpi_disable) {
+		ACPI_ERROR((AE_INFO,
+			    "No ACPI mode transition supported in this system "
+			    "(enable/disable both zero)"));
+		return_ACPI_STATUS(AE_OK);
+	}
+
+	switch (mode) {
+	case ACPI_SYS_MODE_ACPI:
+
+		/* BIOS should have disabled ALL fixed and GP events */
+
+		status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
+					    (u32) acpi_gbl_FADT.acpi_enable, 8);
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+				  "Attempting to enable ACPI mode\n"));
+		break;
+
+	case ACPI_SYS_MODE_LEGACY:
+		/*
+		 * BIOS should clear all fixed status bits and restore fixed event
+		 * enable bits to default
+		 */
+		status = acpi_hw_write_port(acpi_gbl_FADT.smi_command,
+					    (u32)acpi_gbl_FADT.acpi_disable, 8);
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+				  "Attempting to enable Legacy (non-ACPI) mode\n"));
+		break;
+
+	default:
+
+		return_ACPI_STATUS(AE_BAD_PARAMETER);
+	}
+
+	if (ACPI_FAILURE(status)) {
+		ACPI_EXCEPTION((AE_INFO, status,
+				"Could not write ACPI mode change"));
+		return_ACPI_STATUS(status);
+	}
+
+	return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_hw_get_mode
+ *
+ * PARAMETERS:  none
+ *
+ * RETURN:      SYS_MODE_ACPI or SYS_MODE_LEGACY
+ *
+ * DESCRIPTION: Return current operating state of system. Determined by
+ *              querying the SCI_EN bit.
+ *
+ ******************************************************************************/
+
+u32 acpi_hw_get_mode(void)
+{
+	acpi_status status;
+	u32 value;
+
+	ACPI_FUNCTION_TRACE(hw_get_mode);
+
+	/* If the Hardware Reduced flag is set, machine is always in acpi mode */
+
+	if (acpi_gbl_reduced_hardware) {
+		return_UINT32(ACPI_SYS_MODE_ACPI);
+	}
+
+	/*
+	 * ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
+	 * system does not support mode transition.
+	 */
+	if (!acpi_gbl_FADT.smi_command) {
+		return_UINT32(ACPI_SYS_MODE_ACPI);
+	}
+
+	status = acpi_read_bit_register(ACPI_BITREG_SCI_ENABLE, &value);
+	if (ACPI_FAILURE(status)) {
+		return_UINT32(ACPI_SYS_MODE_LEGACY);
+	}
+
+	if (value) {
+		return_UINT32(ACPI_SYS_MODE_ACPI);
+	} else {
+		return_UINT32(ACPI_SYS_MODE_LEGACY);
+	}
+}
+
+#endif				/* !ACPI_REDUCED_HARDWARE */