Blackfin: bfin_twi.h: start a common TWI header

Start one place for TWI definitions.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

arch/blackfin/include/asm/bfin_twi.h

+/*
+ * bfin_twi.h - interface to Blackfin TWIs
+ *
+ * Copyright 2005-2010 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#ifndef __ASM_BFIN_TWI_H__
+#define __ASM_BFIN_TWI_H__
+
+#include <linux/types.h>
+
+/*
+ * All Blackfin system MMRs are padded to 32bits even if the register
+ * itself is only 16bits.  So use a helper macro to streamline this.
+ */
+#define __BFP(m) u16 m; u16 __pad_##m
+
+/*
+ * bfin twi registers layout
+ */
+struct bfin_twi_regs {
+	__BFP(clkdiv);
+	__BFP(control);
+	__BFP(slave_ctl);
+	__BFP(slave_stat);
+	__BFP(slave_addr);
+	__BFP(master_ctl);
+	__BFP(master_stat);
+	__BFP(master_addr);
+	__BFP(int_stat);
+	__BFP(int_mask);
+	__BFP(fifo_ctl);
+	__BFP(fifo_stat);
+	u32 __pad[20];
+	__BFP(xmt_data8);
+	__BFP(xmt_data16);
+	__BFP(rcv_data8);
+	__BFP(rcv_data16);
+};
+
+#endif