Blackfin: bfin_twi.h: start a common TWI header

/*

 * 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