1/*
  2 * drivers/i2c/busses/i2c-ibm_iic.h
  3 *
  4 * Support for the IIC peripheral on IBM PPC 4xx
  5 *
  6 * Copyright (c) 2003 Zultys Technologies.
  7 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
  8 *
  9 * Based on original work by
 10 * 	Ian DaSilva  <idasilva@mvista.com>
 11 *      Armin Kuster <akuster@mvista.com>
 12 * 	Matt Porter  <mporter@mvista.com>
 13 *
 14 *      Copyright 2000-2003 MontaVista Software Inc.
 15 *
 16 * This program is free software; you can redistribute  it and/or modify it
 17 * under  the terms of  the GNU General  Public License as published by the
 18 * Free Software Foundation;  either version 2 of the  License, or (at your
 19 * option) any later version.
 20 *
 21 */
 22#ifndef __I2C_IBM_IIC_H_
 23#define __I2C_IBM_IIC_H_
 24
 25#include <linux/i2c.h>
 26
 27struct iic_regs {
 28	u16 mdbuf;
 29	u16 sbbuf;
 30	u8 lmadr;
 31	u8 hmadr;
 32	u8 cntl;
 33	u8 mdcntl;
 34	u8 sts;
 35	u8 extsts;
 36	u8 lsadr;
 37	u8 hsadr;
 38	u8 clkdiv;
 39	u8 intmsk;
 40	u8 xfrcnt;
 41	u8 xtcntlss;
 42	u8 directcntl;
 43};
 44
 45struct ibm_iic_private {
 46	struct i2c_adapter adap;
 47	volatile struct iic_regs __iomem *vaddr;
 48	wait_queue_head_t wq;
 49	int idx;
 50	int irq;
 51	int fast_mode;
 52	u8  clckdiv;
 53};
 54
 55/* IICx_CNTL register */
 56#define CNTL_HMT	0x80
 57#define CNTL_AMD	0x40
 58#define CNTL_TCT_MASK	0x30
 59#define CNTL_TCT_SHIFT	4
 60#define CNTL_RPST	0x08
 61#define CNTL_CHT	0x04
 62#define CNTL_RW		0x02
 63#define CNTL_PT		0x01
 64
 65/* IICx_MDCNTL register */
 66#define MDCNTL_FSDB	0x80
 67#define MDCNTL_FMDB	0x40
 68#define MDCNTL_EGC	0x20
 69#define MDCNTL_FSM	0x10
 70#define MDCNTL_ESM	0x08
 71#define MDCNTL_EINT	0x04
 72#define MDCNTL_EUBS	0x02
 73#define MDCNTL_HSCL	0x01
 74
 75/* IICx_STS register */
 76#define STS_SSS		0x80
 77#define STS_SLPR	0x40
 78#define STS_MDBS	0x20
 79#define STS_MDBF	0x10
 80#define STS_SCMP	0x08
 81#define STS_ERR		0x04
 82#define STS_IRQA	0x02
 83#define STS_PT		0x01
 84
 85/* IICx_EXTSTS register */
 86#define EXTSTS_IRQP	0x80
 87#define EXTSTS_BCS_MASK	0x70
 88#define   EXTSTS_BCS_FREE  0x40
 89#define EXTSTS_IRQD	0x08
 90#define EXTSTS_LA	0x04
 91#define EXTSTS_ICT	0x02
 92#define EXTSTS_XFRA	0x01
 93
 94/* IICx_INTRMSK register */
 95#define INTRMSK_EIRC	0x80
 96#define INTRMSK_EIRS	0x40
 97#define INTRMSK_EIWC	0x20
 98#define INTRMSK_EIWS	0x10
 99#define INTRMSK_EIHE	0x08
100#define INTRMSK_EIIC	0x04
101#define INTRMSK_EITA	0x02
102#define INTRMSK_EIMTC	0x01
103
104/* IICx_XFRCNT register */
105#define XFRCNT_MTC_MASK	0x07
106
107/* IICx_XTCNTLSS register */
108#define XTCNTLSS_SRC	0x80
109#define XTCNTLSS_SRS	0x40
110#define XTCNTLSS_SWC	0x20
111#define XTCNTLSS_SWS	0x10
112#define XTCNTLSS_SRST	0x01
113
114/* IICx_DIRECTCNTL register */
115#define DIRCNTL_SDAC	0x08
116#define DIRCNTL_SCC	0x04
117#define DIRCNTL_MSDA	0x02
118#define DIRCNTL_MSC	0x01
119
120/* Check if we really control the I2C bus and bus is free */
121#define DIRCTNL_FREE(v)	(((v) & 0x0f) == 0x0f)
122
123#endif /* __I2C_IBM_IIC_H_ */