diff --git a/include/asm-blackfin/mach-common/bits/twi.h b/include/asm-blackfin/mach-common/bits/twi.h
new file mode 100644
index 0000000..8fa7d9f
--- /dev/null
+++ b/include/asm-blackfin/mach-common/bits/twi.h
@@ -0,0 +1,77 @@
+/*
+ * TWI Masks
+ */
+
+#ifndef __BFIN_PERIPHERAL_TWI__
+#define __BFIN_PERIPHERAL_TWI__
+
+/* TWI_CLKDIV Macros (Use: *pTWI_CLKDIV = CLKLOW(x)|CLKHI(y); ) */
+#define	CLKLOW(x)		((x) & 0xFF)		/* Periods Clock Is Held Low */
+#define CLKHI(y)		(((y)&0xFF)<<0x8)	/* Periods Before New Clock Low */
+
+/* TWI_PRESCALE Masks */
+#define	PRESCALE		0x007F	/* SCLKs Per Internal Time Reference (10MHz) */
+#define	TWI_ENA			0x0080	/* TWI Enable */
+#define	SCCB			0x0200	/* SCCB Compatibility Enable */
+
+/* TWI_SLAVE_CTL Masks */
+#define	SEN			0x0001	/* Slave Enable */
+#define	SADD_LEN		0x0002	/* Slave Address Length */
+#define	STDVAL			0x0004	/* Slave Transmit Data Valid */
+#define	TSC_NAK			0x0008	/* NAK/ACK* Generated At Conclusion Of Transfer */
+#define	GEN			0x0010	/* General Call Adrress Matching Enabled */
+
+/* TWI_SLAVE_STAT Masks */
+#define	SDIR			0x0001	/* Slave Transfer Direction (Transmit/Receive*) */
+#define GCALL			0x0002	/* General Call Indicator */
+
+/* TWI_MASTER_CTRL Masks */
+#define	MEN			0x0001	/* Master Mode Enable */
+#define	MADD_LEN		0x0002	/* Master Address Length */
+#define	MDIR			0x0004	/* Master Transmit Direction (RX/TX*) */
+#define	FAST			0x0008	/* Use Fast Mode Timing Specs */
+#define	STOP			0x0010	/* Issue Stop Condition */
+#define	RSTART			0x0020	/* Repeat Start or Stop* At End Of Transfer */
+#define	DCNT			0x3FC0	/* Data Bytes To Transfer */
+#define	SDAOVR			0x4000	/* Serial Data Override */
+#define	SCLOVR			0x8000	/* Serial Clock Override */
+
+/* TWI_MASTER_STAT Masks */
+#define	MPROG			0x0001	/* Master Transfer In Progress */
+#define	LOSTARB			0x0002	/* Lost Arbitration Indicator (Xfer Aborted) */
+#define	ANAK			0x0004	/* Address Not Acknowledged */
+#define	DNAK			0x0008	/* Data Not Acknowledged */
+#define	BUFRDERR		0x0010	/* Buffer Read Error */
+#define	BUFWRERR		0x0020	/* Buffer Write Error */
+#define	SDASEN			0x0040	/* Serial Data Sense */
+#define	SCLSEN			0x0080	/* Serial Clock Sense */
+#define	BUSBUSY			0x0100	/* Bus Busy Indicator */
+
+/* TWI_INT_SRC and TWI_INT_ENABLE Masks */
+#define	SINIT			0x0001	/* Slave Transfer Initiated */
+#define	SCOMP			0x0002	/* Slave Transfer Complete */
+#define	SERR			0x0004	/* Slave Transfer Error */
+#define	SOVF			0x0008	/* Slave Overflow */
+#define	MCOMP			0x0010	/* Master Transfer Complete */
+#define	MERR			0x0020	/* Master Transfer Error */
+#define	XMTSERV			0x0040	/* Transmit FIFO Service */
+#define	RCVSERV			0x0080	/* Receive FIFO Service */
+
+/* TWI_FIFO_CTRL Masks */
+#define	XMTFLUSH		0x0001	/* Transmit Buffer Flush */
+#define	RCVFLUSH		0x0002	/* Receive Buffer Flush */
+#define	XMTINTLEN		0x0004	/* Transmit Buffer Interrupt Length */
+#define	RCVINTLEN		0x0008	/* Receive Buffer Interrupt Length */
+
+/* TWI_FIFO_STAT Masks */
+#define	XMTSTAT			0x0003	/* Transmit FIFO Status */
+#define	XMT_EMPTY		0x0000	/* Transmit FIFO Empty */
+#define	XMT_HALF		0x0001	/* Transmit FIFO Has 1 Byte To Write */
+#define	XMT_FULL		0x0003	/* Transmit FIFO Full (2 Bytes To Write) */
+
+#define	RCVSTAT			0x000C	/* Receive FIFO Status */
+#define	RCV_EMPTY		0x0000	/* Receive FIFO Empty */
+#define	RCV_HALF		0x0004	/* Receive FIFO Has 1 Byte To Read */
+#define	RCV_FULL		0x000C	/* Receive FIFO Full (2 Bytes To Read) */
+
+#endif