ArmPlatformPkg: Introduce ArmPlatformSysConfigLib

The purpose of this library is to create an interface to communicate
with the platform micro-controller.
It abstracts the communication protocol (eg: SPI, UART, etc) between
the application processor and the micro-controller.

ArmPlatformPkg/ArmVExpressPkg: Implement ArmPlaformSysConfigLib

This implementation allows to communicate with the microcontroller of the
Versatile Express motherboard.



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11785 6f19259b-4bc3-4df7-8a09-765794883524

ArmPlatformPkg/Include/Library/ArmPlatformSysConfigLib.h

@@ -0,0 +1,55 @@
+/** @file  ArmPlatformSysConfigLib.h
+
+  Copyright (c) 2011, ARM Ltd. All rights reserved.<BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef __ARM_PLATFORM_SYS_CONFIG_H__
+#define __ARM_PLATFORM_SYS_CONFIG_H__
+
+#include <Base.h>
+
+/* This header file makes it easier to access the System Configuration Registers
+ * in the ARM Versatile Express motherboard.
+ */
+
+//
+// Typedef
+//
+typedef UINT32  SYS_CONFIG_FUNCTION;
+
+//
+// Functions
+//
+EFI_STATUS
+ArmPlatformSysConfigInitialize (
+  VOID
+  );
+
+EFI_STATUS
+ArmPlatformSysConfigGet (
+  IN  SYS_CONFIG_FUNCTION   Function,
+  OUT UINT32*               Value
+  );
+
+EFI_STATUS
+ArmPlatformSysConfigSet (
+  IN  SYS_CONFIG_FUNCTION   Function,
+  IN  UINT32                Value
+  );
+
+EFI_STATUS
+ArmPlatformSysConfigSetDevice (
+  IN  SYS_CONFIG_FUNCTION   Function,
+  IN  UINT32                Device,
+  IN  UINT32                Value
+  );
+
+#endif /* __SYS_CFG_REGISTERS_H__ */