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_ */
124