diff --git a/include/405gp_i2c.h b/include/405gp_i2c.h
new file mode 100644
index 0000000..5a9a497
--- /dev/null
+++ b/include/405gp_i2c.h
@@ -0,0 +1,64 @@
+#ifndef _405gp_i2c_h_
+#define _405gp_i2c_h_
+
+#define	   I2C_REGISTERS_BASE_ADDRESS 0xEF600500
+#define    IIC_MDBUF	(I2C_REGISTERS_BASE_ADDRESS+IICMDBUF)
+#define    IIC_SDBUF	(I2C_REGISTERS_BASE_ADDRESS+IICSDBUF)
+#define    IIC_LMADR	(I2C_REGISTERS_BASE_ADDRESS+IICLMADR)
+#define    IIC_HMADR	(I2C_REGISTERS_BASE_ADDRESS+IICHMADR)
+#define    IIC_CNTL	(I2C_REGISTERS_BASE_ADDRESS+IICCNTL)
+#define    IIC_MDCNTL	(I2C_REGISTERS_BASE_ADDRESS+IICMDCNTL)
+#define    IIC_STS	(I2C_REGISTERS_BASE_ADDRESS+IICSTS)
+#define    IIC_EXTSTS	(I2C_REGISTERS_BASE_ADDRESS+IICEXTSTS)
+#define    IIC_LSADR	(I2C_REGISTERS_BASE_ADDRESS+IICLSADR)
+#define    IIC_HSADR	(I2C_REGISTERS_BASE_ADDRESS+IICHSADR)
+#define    IIC_CLKDIV	(I2C_REGISTERS_BASE_ADDRESS+IICCLKDIV)
+#define    IIC_INTRMSK	(I2C_REGISTERS_BASE_ADDRESS+IICINTRMSK)
+#define    IIC_XFRCNT	(I2C_REGISTERS_BASE_ADDRESS+IICXFRCNT)
+#define    IIC_XTCNTLSS	(I2C_REGISTERS_BASE_ADDRESS+IICXTCNTLSS)
+#define    IIC_DIRECTCNTL (I2C_REGISTERS_BASE_ADDRESS+IICDIRECTCNTL)
+
+/* MDCNTL Register Bit definition */
+#define    IIC_MDCNTL_HSCL 0x01
+#define    IIC_MDCNTL_EUBS 0x02
+#define    IIC_MDCNTL_EINT 0x04
+#define    IIC_MDCNTL_ESM  0x08
+#define    IIC_MDCNTL_FSM  0x10
+#define    IIC_MDCNTL_EGC  0x20
+#define    IIC_MDCNTL_FMDB 0x40
+#define    IIC_MDCNTL_FSDB 0x80
+
+/* CNTL Register Bit definition */
+#define    IIC_CNTL_PT     0x01
+#define    IIC_CNTL_READ   0x02
+#define    IIC_CNTL_CHT    0x04
+#define    IIC_CNTL_RPST   0x08
+/* bit 2/3 for Transfer count*/
+#define    IIC_CNTL_AMD    0x40
+#define    IIC_CNTL_HMT    0x80
+
+/* STS Register Bit definition */
+#define    IIC_STS_PT	   0X01
+#define    IIC_STS_IRQA    0x02
+#define    IIC_STS_ERR	   0X04
+#define    IIC_STS_SCMP    0x08
+#define    IIC_STS_MDBF    0x10
+#define    IIC_STS_MDBS    0X20
+#define    IIC_STS_SLPR    0x40
+#define    IIC_STS_SSS     0x80
+
+/* EXTSTS Register Bit definition */
+#define    IIC_EXTSTS_XFRA 0X01
+#define    IIC_EXTSTS_ICT  0X02
+#define    IIC_EXTSTS_LA   0X04
+
+/* XTCNTLSS Register Bit definition */
+#define    IIC_XTCNTLSS_SRST  0x01
+#define    IIC_XTCNTLSS_EPI   0x02
+#define    IIC_XTCNTLSS_SDBF  0x04
+#define    IIC_XTCNTLSS_SBDD  0x08
+#define    IIC_XTCNTLSS_SWS   0x10
+#define    IIC_XTCNTLSS_SWC   0x20
+#define    IIC_XTCNTLSS_SRS   0x40
+#define    IIC_XTCNTLSS_SRC   0x80
+#endif