i2cdriver.c

mpc860 i2c driver for vxworks

/* I2cDriver.c -  MPC860 I2c driver functions
 *
 *  Copyright  (c)  2002  UTStarcom, Inc.
 *          All Rights Reserved.
 *
 *  Subsystem:		VDSL
 *  File:     		ppc860I2c.c
 *  Created By:   	DQXie
 *  Created On:     25/2/2002
 *  
 *  Purpose: 
 *    This file contains I2C driver functions called by applications.
 */

#include "copyright_wrs.h"
#include "vxWorks.h"
#include "config.h"
#include "vxLib.h"
#include "iv.h"
#include "intLib.h"
#include "semLib.h"
#include "sysLib.h"
/*
	#include "logLib.h"
*/
#include "taskLib.h"
#include "cacheLib.h"
#include "stdio.h"
#include "drv/sio/ppc860Sio.h"
#include "drv/multi/ppc860Cpm.h"
#include "drv/intrCtl/ppc860Intr.h"
#include "I2cDriver.h"
#include "ppc860I2c.h"
#include "string.h"

/* Local value defines */

/********************************************************
 * I2cDriverInit: to init I2C
 * parameters:
 *  I2cMode:	0 --- slave
 *        		1 --- master
 *	eventFunc --- an event handling function pointer
 *
 * returns:
 *	OK    --- init success;
 *	ERROR --- init fail;
 */
STATUS I2cDriverInit(char mode, VOIDFUNCPTR eventFunc)
{
	VPFUNCPTR	I2cAlloc;
	FUNCPTR		I2cFree;
	if (ppc860I2cHwInit(mode) != I2COK)
	{
		I2CPRINT("I2cDriverInit: init failed!\n");
		return ERROR;
	}
	
	I2cAlloc = cacheDmaMalloc;
	I2cFree  = cacheDmaFree;
#if 0
#ifdef	INCLUDE_CACHE_SUPPORT
	I2cAlloc = cacheDmaMalloc;
	I2cFree  = cacheDmaFree;
#else	/* cache is disabled */
	I2cAlloc = (VPFUNCPTR)malloc;
	I2cFree  = (FUNCPTR)free;
#endif	/* I2C_CACHE_ENABLE */
#endif

	if (ppc860I2cOpen(eventFunc, I2cAlloc, I2cFree) != I2COK)
	{
		I2CPRINT("I2cDriverInit: open failed!\n");
		return ERROR;
	}
	I2CPRINT("I2cDriverInit: OK!\n");
	return OK;
}

/********************************************************
 * I2cDriverWrite: transmit I2C data
 * NOTE: if mpc860 acts as an I2C master, the data 
 *   length should not be larger than (I2C_DATA_SZ_MAX - 1)
 *
 * parameters:
 *	pData  --- point to the data buffer containing the 
 *             data to be transmitted.
 *	length --- the byte number of the data in the buffer
 *             pData points to.
 * returns:
 *	length		--- success.
 *	ERROR(-1)	--- failed.
 */
int I2cDriverWrite(char* pData, UINT16 length)
{
	if (pData == NULL || length == 0)
	{
		I2CPRINT("I2CDriverWrite: data pointer is NULL or NO data in data buffer!\n");
		return ERROR;
	}
	if (length > I2C_DATA_SZ_MAX)
	{
		I2CPRINT("I2CDriverWrite: data length(=%d) is too large!\n", length);
		I2CPRINT("\tMax data length is defined as %d\n", I2C_DATA_SZ_MAX);
		return ERROR;
	}
	if (ppc860I2cWrite(pData, length) == I2CERROR)
	{
/*
		I2CPRINT("I2cDriverWrite: failed!\n");
*/
		return ERROR;
	}
/*	I2CPRINT("I2cDriverWrite: write buffer OK!\n");*/
	return length;
}

/********************************************************
 * I2cDriverRead: read I2C data (I2C master mode)
 *
 * parameters:
 *
 * returns:
 *	ERROR(-1)	--- failed.
 */
STATUS I2CDriverRead(void)
{
	char data = (char)((MPC860_I2C_SLAVE_ADDR << 1) + 1);
	UINT16 dataLength = 1;
	if (ppc860I2cWrite(&data, dataLength) != I2COK)
	{
		I2CPRINT("I2cDriverWrite: failed!\n");
		return ERROR;
	}
	return OK;
}