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diff --git a/Silicon/BroxtonSoC/BroxtonSiPkg/SouthCluster/Library/I2CLibPei/I2CAccess.h b/Silicon/BroxtonSoC/BroxtonSiPkg/SouthCluster/Library/I2CLibPei/I2CAccess.h
new file mode 100644
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+++ b/Silicon/BroxtonSoC/BroxtonSiPkg/SouthCluster/Library/I2CLibPei/I2CAccess.h
@@ -0,0 +1,51 @@
+
+/** @file
+  Macros that simplify accessing I2C device's registers.
+
+  Copyright (c) 2014 - 2017, Intel Corporation. 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 _I2C_ACCESS_H_
+#define _I2C_ACCESS_H_
+
+///
+/// Memory Mapped PCI Access macros
+///
+
+#include "I2CIoLibPei.h"
+
+#define DEFAULT_PCI_BUS_NUMBER_SC   0
+
+#define PCI_DEVICE_NUMBER_LPC       31
+#define PCI_FUNCTION_NUMBER_LPC     0
+
+#define R_LPC_ACPI_BASE             0x40        ///< ABASE, 16bit
+#define R_LPC_ACPI_BASEADR          0x400       ///< ABASE, 16bit
+#define B_LPC_ACPI_BASE_EN          BIT1        ///< Enable Bit
+#define B_LPC_ACPI_BASE_BAR         0x0000FF80  ///< Base Address, 128 Bytes
+#define V_ACPI_PM1_TMR_MAX_VAL      0x1000000   ///< The timer is 24 bit overflow
+#define B_ACPI_PM1_TMR_VAL          0xFFFFFF    ///< The timer value mask
+
+#define R_ACPI_PM1_TMR              0x08        ///< Power Management 1 Timer
+#define V_ACPI_PM1_TMR_FREQUENCY    3579545     ///< Timer Frequency
+
+
+#define ScLpcPciCfg8(Register)      I2CLibPeiMmioRead8 (MmPciAddress (0, DEFAULT_PCI_BUS_NUMBER_SC, PCI_DEVICE_NUMBER_LPC, 0, Register))
+
+#define MmPciAddress( Segment, Bus, Device, Function, Register ) \
+  ( (UINTN)PcdGet64 (PcdPciExpressBaseAddress)+ \
+    (UINTN)(Bus << 20) + \
+    (UINTN)(Device << 15) + \
+    (UINTN)(Function << 12) + \
+    (UINTN)(Register) \
+  )
+#endif