--- /dev/null
+/******************************************************************************
+ *
+ * Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2015, Intel Corp.
+ * 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 "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 */
Code Review / kvmfornfv.git / blobdiff