xref: /openbmc/u-boot/drivers/i2c/mv_i2c.h (revision 3df619ec)

/*
 * (C) Copyright 2011
 * Marvell Inc, <www.marvell.com>
 *
 * 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 _MV_I2C_H_
#define _MV_I2C_H_
extern void i2c_clk_enable(void);

/* Shall the current transfer have a start/stop condition? */
#define I2C_COND_NORMAL		0
#define I2C_COND_START		1
#define I2C_COND_STOP		2

/* Shall the current transfer be ack/nacked or being waited for it? */
#define I2C_ACKNAK_WAITACK	1
#define I2C_ACKNAK_SENDACK	2
#define I2C_ACKNAK_SENDNAK	4

/* Specify who shall transfer the data (master or slave) */
#define I2C_READ		0
#define I2C_WRITE		1

#if (CONFIG_SYS_I2C_SPEED == 400000)
#define I2C_ICR_INIT	(ICR_FM | ICR_BEIE | ICR_IRFIE | ICR_ITEIE | ICR_GCD \
		| ICR_SCLE)
#else
#define I2C_ICR_INIT	(ICR_BEIE | ICR_IRFIE | ICR_ITEIE | ICR_GCD | ICR_SCLE)
#endif

#define I2C_ISR_INIT		0x7FF
/* ----- Control register bits ---------------------------------------- */

#define ICR_START	0x1		/* start bit */
#define ICR_STOP	0x2		/* stop bit */
#define ICR_ACKNAK	0x4		/* send ACK(0) or NAK(1) */
#define ICR_TB		0x8		/* transfer byte bit */
#define ICR_MA		0x10		/* master abort */
#define ICR_SCLE	0x20		/* master clock enable, mona SCLEA */
#define ICR_IUE		0x40		/* unit enable */
#define ICR_GCD		0x80		/* general call disable */
#define ICR_ITEIE	0x100		/* enable tx interrupts */
#define ICR_IRFIE	0x200		/* enable rx interrupts, mona: DRFIE */
#define ICR_BEIE	0x400		/* enable bus error ints */
#define ICR_SSDIE	0x800		/* slave STOP detected int enable */
#define ICR_ALDIE	0x1000		/* enable arbitration interrupt */
#define ICR_SADIE	0x2000		/* slave address detected int enable */
#define ICR_UR		0x4000		/* unit reset */
#define ICR_FM		0x8000		/* Fast Mode */

/* ----- Status register bits ----------------------------------------- */

#define ISR_RWM		0x1		/* read/write mode */
#define ISR_ACKNAK	0x2		/* ack/nak status */
#define ISR_UB		0x4		/* unit busy */
#define ISR_IBB		0x8		/* bus busy */
#define ISR_SSD		0x10		/* slave stop detected */
#define ISR_ALD		0x20		/* arbitration loss detected */
#define ISR_ITE		0x40		/* tx buffer empty */
#define ISR_IRF		0x80		/* rx buffer full */
#define ISR_GCAD	0x100		/* general call address detected */
#define ISR_SAD		0x200		/* slave address detected */
#define ISR_BED		0x400		/* bus error no ACK/NAK */

#endif