i2c_defs.h

u-boot 源代码

/*
 * (C) Copyright 2004
 * Texas Instruments, <www.ti.com>
 *
 * Some changes copyright (C) 2007 Sergey Kubushyn <[e-mail]>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */
#ifndef _DAVINCI_I2C_H_
#define _DAVINCI_I2C_H_

#define I2C_WRITE		0
#define I2C_READ		1

#define I2C_BASE		0x01c21000

#define	I2C_OA			(I2C_BASE + 0x00)
#define I2C_IE			(I2C_BASE + 0x04)
#define I2C_STAT		(I2C_BASE + 0x08)
#define I2C_SCLL		(I2C_BASE + 0x0c)
#define I2C_SCLH		(I2C_BASE + 0x10)
#define I2C_CNT			(I2C_BASE + 0x14)
#define I2C_DRR			(I2C_BASE + 0x18)
#define I2C_SA			(I2C_BASE + 0x1c)
#define I2C_DXR			(I2C_BASE + 0x20)
#define I2C_CON			(I2C_BASE + 0x24)
#define I2C_IV			(I2C_BASE + 0x28)
#define I2C_PSC			(I2C_BASE + 0x30)

/* I2C masks */

/* I2C Interrupt Enable Register (I2C_IE): */
#define I2C_IE_SCD_IE	(1 << 5)	/* Stop condition detect interrupt enable */
#define I2C_IE_XRDY_IE	(1 << 4)	/* Transmit data ready interrupt enable */
#define I2C_IE_RRDY_IE	(1 << 3)	/* Receive data ready interrupt enable */
#define I2C_IE_ARDY_IE	(1 << 2)	/* Register access ready interrupt enable */
#define I2C_IE_NACK_IE	(1 << 1)	/* No acknowledgment interrupt enable */
#define I2C_IE_AL_IE	(1 << 0)	/* Arbitration lost interrupt enable */

/* I2C Status Register (I2C_STAT): */

#define I2C_STAT_BB	(1 << 12)	/* Bus busy */
#define I2C_STAT_ROVR	(1 << 11)	/* Receive overrun */
#define I2C_STAT_XUDF	(1 << 10)	/* Transmit underflow */
#define I2C_STAT_AAS	(1 << 9)	/* Address as slave */
#define I2C_STAT_SCD	(1 << 5)	/* Stop condition detect */
#define I2C_STAT_XRDY	(1 << 4)	/* Transmit data ready */
#define I2C_STAT_RRDY	(1 << 3)	/* Receive data ready */
#define I2C_STAT_ARDY	(1 << 2)	/* Register access ready */
#define I2C_STAT_NACK	(1 << 1)	/* No acknowledgment interrupt enable */
#define I2C_STAT_AL	(1 << 0)	/* Arbitration lost interrupt enable */


/* I2C Interrupt Code Register (I2C_INTCODE): */

#define I2C_INTCODE_MASK	7
#define I2C_INTCODE_NONE	0
#define I2C_INTCODE_AL		1	/* Arbitration lost */
#define I2C_INTCODE_NAK		2	/* No acknowledgement/general call */
#define I2C_INTCODE_ARDY	3	/* Register access ready */
#define I2C_INTCODE_RRDY	4	/* Rcv data ready */
#define I2C_INTCODE_XRDY	5	/* Xmit data ready */
#define I2C_INTCODE_SCD		6	/* Stop condition detect */


/* I2C Configuration Register (I2C_CON): */

#define I2C_CON_EN	(1 << 5)	/* I2C module enable */
#define I2C_CON_STB	(1 << 4)	/* Start byte mode (master mode only) */
#define I2C_CON_MST	(1 << 10)	/* Master/slave mode */
#define I2C_CON_TRX	(1 << 9)	/* Transmitter/receiver mode (master mode only) */
#define I2C_CON_XA	(1 << 8)	/* Expand address */
#define I2C_CON_STP	(1 << 11)	/* Stop condition (master mode only) */
#define I2C_CON_STT	(1 << 13)	/* Start condition (master mode only) */

#define I2C_TIMEOUT	0xffff0000	/* Timeout mask for poll_i2c_irq() */

#endif