1. 根目录:
2. drivers
3. i2c
4. busses
5. i2c-ibm_iic.h

/*
 * drivers/i2c/busses/i2c-ibm_iic.h
 *
 * Support for the IIC peripheral on IBM PPC 4xx
 *
 * Copyright (c) 2003 Zultys Technologies.
 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
 *
 * Based on original work by
 * 	Ian DaSilva  <idasilva@mvista.com>
 *      Armin Kuster <akuster@mvista.com>
 * 	Matt Porter  <mporter@mvista.com>
 *
 *      Copyright 2000-2003 MontaVista Software Inc.
 *
 * 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 __I2C_IBM_IIC_H_
#define __I2C_IBM_IIC_H_

#include <linux/i2c.h>

struct iic_regs {
	u16 mdbuf;
	u16 sbbuf;
	u8 lmadr;
	u8 hmadr;
	u8 cntl;
	u8 mdcntl;
	u8 sts;
	u8 extsts;
	u8 lsadr;
	u8 hsadr;
	u8 clkdiv;
	u8 intmsk;
	u8 xfrcnt;
	u8 xtcntlss;
	u8 directcntl;
};

struct ibm_iic_private {
	struct i2c_adapter adap;
	volatile struct iic_regs __iomem *vaddr;
	wait_queue_head_t wq;
	int idx;
	int irq;
	int fast_mode;
	u8  clckdiv;
};

/* IICx_CNTL register */
#define CNTL_HMT	0x80
#define CNTL_AMD	0x40
#define CNTL_TCT_MASK	0x30
#define CNTL_TCT_SHIFT	4
#define CNTL_RPST	0x08
#define CNTL_CHT	0x04
#define CNTL_RW		0x02
#define CNTL_PT		0x01

/* IICx_MDCNTL register */
#define MDCNTL_FSDB	0x80
#define MDCNTL_FMDB	0x40
#define MDCNTL_EGC	0x20
#define MDCNTL_FSM	0x10
#define MDCNTL_ESM	0x08
#define MDCNTL_EINT	0x04
#define MDCNTL_EUBS	0x02
#define MDCNTL_HSCL	0x01

/* IICx_STS register */
#define STS_SSS		0x80
#define STS_SLPR	0x40
#define STS_MDBS	0x20
#define STS_MDBF	0x10
#define STS_SCMP	0x08
#define STS_ERR		0x04
#define STS_IRQA	0x02
#define STS_PT		0x01

/* IICx_EXTSTS register */
#define EXTSTS_IRQP	0x80
#define EXTSTS_BCS_MASK	0x70
#define   EXTSTS_BCS_FREE  0x40
#define EXTSTS_IRQD	0x08
#define EXTSTS_LA	0x04
#define EXTSTS_ICT	0x02
#define EXTSTS_XFRA	0x01

/* IICx_INTRMSK register */
#define INTRMSK_EIRC	0x80
#define INTRMSK_EIRS	0x40
#define INTRMSK_EIWC	0x20
#define INTRMSK_EIWS	0x10
#define INTRMSK_EIHE	0x08
#define INTRMSK_EIIC	0x04
#define INTRMSK_EITA	0x02
#define INTRMSK_EIMTC	0x01

/* IICx_XFRCNT register */
#define XFRCNT_MTC_MASK	0x07

/* IICx_XTCNTLSS register */
#define XTCNTLSS_SRC	0x80
#define XTCNTLSS_SRS	0x40
#define XTCNTLSS_SWC	0x20
#define XTCNTLSS_SWS	0x10
#define XTCNTLSS_SRST	0x01

/* IICx_DIRECTCNTL register */
#define DIRCNTL_SDAC	0x08
#define DIRCNTL_SCC	0x04
#define DIRCNTL_MSDA	0x02
#define DIRCNTL_MSC	0x01

/* Check if we really control the I2C bus and bus is free */
#define DIRCTNL_FREE(v)	(((v) & 0x0f) == 0x0f)

#endif /* __I2C_IBM_IIC_H_ */