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/*
* To read information of the EEPROM via the I2C
*/
/*
* Copyright (c) 2003, 2004 Brookhaven National Laboratory
* Author: S. Kate Feng <feng1@bnl.gov>
* All rights reserved.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution.
*/
#include <bsp.h>
#include <rtems/bspIo.h> /* printk */
#include <stdint.h> /* uint32_t */
#include "bsp/GT64260TWSI.h"
/* #define I2C_DEBUG*/
static unsigned char I2cAddrPack(unsigned char busAddr,uint32_t offset)
{
return(busAddr | ((offset & 0x700) >> 7));
}
static unsigned char I2cDevByteAddr(uint32_t devA2A1A0, unsigned char byteNum)
{
return(( devA2A1A0 >>(byteNum*8)) & 0xff);
}
/****************************************************************************
* I2Cread_eeprom - read EEPROM VPD from the I2C
*/
int I2Cread_eeprom(
unsigned char I2cBusAddr,
uint32_t devA2A1A0,
uint32_t AddrBytes,
unsigned char *pBuff,
uint32_t numBytes
)
{
int status=0, lastByte=0;
switch (AddrBytes) {
case 1:
if ((status=GT64260TWSIstart()) != -1) {
if ((status=GT64260TWSIwrite(I2cAddrPack(I2cBusAddr,devA2A1A0)))!= -1){
if ((status=GT64260TWSIwrite(devA2A1A0))!=-1){
if ((status=GT64260TWSIstart())!=-1)
status=GT64260TWSIwrite(I2cAddrPack((I2cBusAddr|0x01),devA2A1A0));
}
}
}
break;
case 2:
if ((status=GT64260TWSIstart())!=-1) {
if ((status=GT64260TWSIwrite(I2cBusAddr))!= -1) {
if ((status=GT64260TWSIwrite(I2cDevByteAddr(devA2A1A0,1)))!=-1) {
if ((status=GT64260TWSIwrite(I2cDevByteAddr(devA2A1A0,0)))!= -1){
if ((status=GT64260TWSIstart()) != -1) {
status = GT64260TWSIwrite((I2cBusAddr | 0x01));
}
}
}
}
}
break;
case 3:
if ((status = GT64260TWSIstart())!= -1) {
if ((status = GT64260TWSIwrite(I2cBusAddr))!= -1) {
if ((status=GT64260TWSIwrite(I2cDevByteAddr(devA2A1A0,2)))!= -1){
if ((status=GT64260TWSIwrite(I2cDevByteAddr(devA2A1A0,1)))!= -1){
if ((status=GT64260TWSIwrite(I2cDevByteAddr(devA2A1A0,0)))!= -1){
if ((status=GT64260TWSIstart())!= -1) {
status = GT64260TWSIwrite(I2cBusAddr | 0x01);
}
}
}
}
}
}
break;
default:
status=-1;
break;
}
if (status !=-1) {
#ifdef I2C_DEBUG
printk("\n");
#endif
/* read data from device */
for ( ; numBytes > 0; numBytes-- ) {
if ( numBytes == 1) lastByte=1;
if (GT64260TWSIread(pBuff,lastByte) == -1) return (-1);
#ifdef I2C_DEBUG
printk("%2x ", *pBuff);
if ( (numBytes % 20)==0 ) printk("\n");
#endif
pBuff++;
}
#ifdef I2C_DEBUG
printk("\n");
#endif
if (GT64260TWSIstop() == -1) return (-1);
}
return (status);
}
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