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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/drivers/i2c/busses/i2c-ibm_iic.h
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/*

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 * drivers/i2c/busses/i2c-ibm_iic.h

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 *

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 * Support for the IIC peripheral on IBM PPC 4xx

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 *

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 * Copyright (c) 2003 Zultys Technologies.

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 * Eugene Surovegin <[email protected]> or <[email protected]>

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 *

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 * Based on original work by

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 * 	Ian DaSilva  <[email protected]>

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 *      Armin Kuster <[email protected]>

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 * 	Matt Porter  <[email protected]>

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 *

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 *      Copyright 2000-2003 MontaVista Software Inc.

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 *

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 * This program is free software; you can redistribute  it and/or modify it

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 * under  the terms of  the GNU General  Public License as published by the

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 * Free Software Foundation;  either version 2 of the  License, or (at your

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 * option) any later version.

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 *

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 */

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#ifndef __I2C_IBM_IIC_H_

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#define __I2C_IBM_IIC_H_

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#include <linux/i2c.h>

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struct iic_regs {

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	u16 mdbuf;

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	u16 sbbuf;

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	u8 lmadr;

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	u8 hmadr;

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	u8 cntl;

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	u8 mdcntl;

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	u8 sts;

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	u8 extsts;

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	u8 lsadr;

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	u8 hsadr;

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	u8 clkdiv;

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	u8 intmsk;

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	u8 xfrcnt;

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	u8 xtcntlss;

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	u8 directcntl;

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};

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struct ibm_iic_private {

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	struct i2c_adapter adap;

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	volatile struct iic_regs __iomem *vaddr;

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	wait_queue_head_t wq;

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	int idx;

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	int irq;

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	int fast_mode;

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	u8  clckdiv;

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};

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/* IICx_CNTL register */

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#define CNTL_HMT	0x80

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#define CNTL_AMD	0x40

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#define CNTL_TCT_MASK	0x30

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#define CNTL_TCT_SHIFT	4

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#define CNTL_RPST	0x08

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#define CNTL_CHT	0x04

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#define CNTL_RW		0x02

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#define CNTL_PT		0x01

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/* IICx_MDCNTL register */

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#define MDCNTL_FSDB	0x80

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#define MDCNTL_FMDB	0x40

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#define MDCNTL_EGC	0x20

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#define MDCNTL_FSM	0x10

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#define MDCNTL_ESM	0x08

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#define MDCNTL_EINT	0x04

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#define MDCNTL_EUBS	0x02

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#define MDCNTL_HSCL	0x01

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/* IICx_STS register */

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#define STS_SSS		0x80

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#define STS_SLPR	0x40

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#define STS_MDBS	0x20

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#define STS_MDBF	0x10

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#define STS_SCMP	0x08

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#define STS_ERR		0x04

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#define STS_IRQA	0x02

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#define STS_PT		0x01

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/* IICx_EXTSTS register */

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#define EXTSTS_IRQP	0x80

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#define EXTSTS_BCS_MASK	0x70

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#define   EXTSTS_BCS_FREE  0x40

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#define EXTSTS_IRQD	0x08

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#define EXTSTS_LA	0x04

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#define EXTSTS_ICT	0x02

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#define EXTSTS_XFRA	0x01

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/* IICx_INTRMSK register */

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#define INTRMSK_EIRC	0x80

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#define INTRMSK_EIRS	0x40

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#define INTRMSK_EIWC	0x20

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#define INTRMSK_EIWS	0x10

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#define INTRMSK_EIHE	0x08

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#define INTRMSK_EIIC	0x04

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#define INTRMSK_EITA	0x02

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#define INTRMSK_EIMTC	0x01

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/* IICx_XFRCNT register */

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#define XFRCNT_MTC_MASK	0x07

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/* IICx_XTCNTLSS register */

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#define XTCNTLSS_SRC	0x80

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#define XTCNTLSS_SRS	0x40

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#define XTCNTLSS_SWC	0x20

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#define XTCNTLSS_SWS	0x10

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#define XTCNTLSS_SRST	0x01

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/* IICx_DIRECTCNTL register */

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#define DIRCNTL_SDAC	0x08

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#define DIRCNTL_SCC	0x04

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#define DIRCNTL_MSDA	0x02

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#define DIRCNTL_MSC	0x01

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/* Check if we really control the I2C bus and bus is free */

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#define DIRCTNL_FREE(v)	(((v) & 0x0f) == 0x0f)

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#endif /* __I2C_IBM_IIC_H_ */

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