at91_twi.h

linux 内核源代码

/*
 * include/asm-arm/arch-at91/at91_twi.h
 *
 * Copyright (C) 2005 Ivan Kokshaysky
 * Copyright (C) SAN People
 *
 * Two-wire Interface (TWI) registers.
 * Based on AT91RM9200 datasheet revision E.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#ifndef AT91_TWI_H
#define AT91_TWI_H

#define	AT91_TWI_CR		0x00		/* Control Register */
#define		AT91_TWI_START		(1 <<  0)	/* Send a Start Condition */
#define		AT91_TWI_STOP		(1 <<  1)	/* Send a Stop Condition */
#define		AT91_TWI_MSEN		(1 <<  2)	/* Master Transfer Enable */
#define		AT91_TWI_MSDIS		(1 <<  3)	/* Master Transfer Disable */
#define		AT91_TWI_SWRST		(1 <<  7)	/* Software Reset */

#define	AT91_TWI_MMR		0x04		/* Master Mode Register */
#define		AT91_TWI_IADRSZ		(3    <<  8)	/* Internal Device Address Size */
#define			AT91_TWI_IADRSZ_NO		(0 << 8)
#define			AT91_TWI_IADRSZ_1		(1 << 8)
#define			AT91_TWI_IADRSZ_2		(2 << 8)
#define			AT91_TWI_IADRSZ_3		(3 << 8)
#define		AT91_TWI_MREAD		(1    << 12)	/* Master Read Direction */
#define		AT91_TWI_DADR		(0x7f << 16)	/* Device Address */

#define	AT91_TWI_IADR		0x0c		/* Internal Address Register */

#define	AT91_TWI_CWGR		0x10		/* Clock Waveform Generator Register */
#define		AT91_TWI_CLDIV		(0xff <<  0)	/* Clock Low Divisor */
#define		AT91_TWI_CHDIV		(0xff <<  8)	/* Clock High Divisor */
#define		AT91_TWI_CKDIV		(7    << 16)	/* Clock Divider */

#define	AT91_TWI_SR		0x20		/* Status Register */
#define		AT91_TWI_TXCOMP		(1 <<  0)	/* Transmission Complete */
#define		AT91_TWI_RXRDY		(1 <<  1)	/* Receive Holding Register Ready */
#define		AT91_TWI_TXRDY		(1 <<  2)	/* Transmit Holding Register Ready */
#define		AT91_TWI_OVRE		(1 <<  6)	/* Overrun Error [AT91RM9200 only] */
#define		AT91_TWI_UNRE		(1 <<  7)	/* Underrun Error [AT91RM9200 only] */
#define		AT91_TWI_NACK		(1 <<  8)	/* Not Acknowledged */

#define	AT91_TWI_IER		0x24		/* Interrupt Enable Register */
#define	AT91_TWI_IDR		0x28		/* Interrupt Disable Register */
#define	AT91_TWI_IMR		0x2c		/* Interrupt Mask Register */
#define	AT91_TWI_RHR		0x30		/* Receive Holding Register */
#define	AT91_TWI_THR		0x34		/* Transmit Holding Register */

#endif