i2c-ibm_iic.h

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/*
 * drivers/i2c/busses/i2c-ibm_iic.h
 *
 * Support for the IIC peripheral on IBM PPC 4xx
 *
 * Copyright (c) 2003 Zultys Technologies.
 * Eugene Surovegin <[email protected]> or <[email protected]>
 *
 * Based on original work by
 *  Ian DaSilva  <[email protected]>
 *      Armin Kuster <[email protected]>
 *  Matt Porter  <[email protected]>
 *
 *      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_ */