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/*
* (C) Copyright 2001
* Stefan Roese, esd gmbh germany, stefan.roese@esd-electronics.com
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*/
#include <common.h>
#include <command.h>
#define EEPROM_CAP 0x50000358
#define EEPROM_DATA 0x5000035c
unsigned int eepromReadLong(int offs)
{
unsigned int value;
volatile unsigned short ret;
int count;
*(unsigned short *)EEPROM_CAP = offs;
count = 0;
for (;;)
{
count++;
ret = *(unsigned short *)EEPROM_CAP;
if ((ret & 0x8000) != 0)
break;
}
value = *(unsigned long *)EEPROM_DATA;
return value;
}
unsigned char eepromReadByte(int offs)
{
unsigned int valueLong;
unsigned char *ptr;
valueLong = eepromReadLong(offs & ~3);
ptr = (unsigned char *)&valueLong;
return ptr[offs & 3];
}
void eepromWriteLong(int offs, unsigned int value)
{
volatile unsigned short ret;
int count;
count = 0;
*(unsigned long *)EEPROM_DATA = value;
*(unsigned short *)EEPROM_CAP = 0x8000 + offs;
for (;;)
{
count++;
ret = *(unsigned short *)EEPROM_CAP;
if ((ret & 0x8000) == 0)
break;
}
}
void eepromWriteByte(int offs, unsigned char valueByte)
{
unsigned int valueLong;
unsigned char *ptr;
valueLong = eepromReadLong(offs & ~3);
ptr = (unsigned char *)&valueLong;
ptr[offs & 3] = valueByte;
eepromWriteLong(offs & ~3, valueLong);
}
void i2c_read (uchar *addr, int alen, uchar *buffer, int len)
{
int i;
int len2, ptr;
/* printf("\naddr=%x alen=%x buffer=%x len=%x", addr[0], addr[1], *(short *)addr, alen, buffer, len); /###* test-only */
ptr = *(short *)addr;
/*
* Read till lword boundary
*/
len2 = 4 - (*(short *)addr & 0x0003);
for (i=0; i<len2; i++)
{
*buffer++ = eepromReadByte(ptr++);
}
/*
* Read all lwords
*/
len2 = (len - len2) >> 2;
for (i=0; i<len2; i++)
{
*(unsigned int *)buffer = eepromReadLong(ptr);
buffer += 4;
ptr += 4;
}
/*
* Read last bytes
*/
len2 = (*(short *)addr + len) & 0x0003;
for (i=0; i<len2; i++)
{
*buffer++ = eepromReadByte(ptr++);
}
}
void i2c_write (uchar *addr, int alen, uchar *buffer, int len)
{
int i;
int len2, ptr;
/* printf("\naddr=%x alen=%x buffer=%x len=%x", addr[0], addr[1], *(short *)addr, alen, buffer, len); /###* test-only */
ptr = *(short *)addr;
/*
* Write till lword boundary
*/
len2 = 4 - (*(short *)addr & 0x0003);
for (i=0; i<len2; i++)
{
eepromWriteByte(ptr++, *buffer++);
}
/*
* Write all lwords
*/
len2 = (len - len2) >> 2;
for (i=0; i<len2; i++)
{
eepromWriteLong(ptr, *(unsigned int *)buffer);
buffer += 4;
ptr += 4;
}
/*
* Write last bytes
*/
len2 = (*(short *)addr + len) & 0x0003;
for (i=0; i<len2; i++)
{
eepromWriteByte(ptr++, *buffer++);
}
}
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