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/*
* Add by Alan Lu, 07-29-2005
* For ATMEL AT24C16 EEPROM
*
* 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 <i2c.h>
#ifdef CFG_EEPROM_AT24C16
#undef DEBUG
void eeprom_init(void)
{
#if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
i2c_init(CFG_I2C_SPEED, CFG_I2C_SLAVE);
#endif
}
int eeprom_read(unsigned dev_addr, unsigned offset, uchar *buffer,
unsigned cnt)
{
int page, count = 0, i = 0;
page = offset / 0x100;
i = offset % 0x100;
while (count < cnt) {
if (i2c_read(dev_addr|page, i++, 1, buffer+count++, 1) != 0)
return 1;
if (i > 0xff) {
page++;
i = 0;
}
}
return 0;
}
/*
* for CFG_I2C_EEPROM_ADDR_LEN == 2 (16-bit EEPROM address) offset is
* 0x000nxxxx for EEPROM address selectors at n, offset xxxx in EEPROM.
*
* for CFG_I2C_EEPROM_ADDR_LEN == 1 (8-bit EEPROM page address) offset is
* 0x00000nxx for EEPROM address selectors and page number at n.
*/
int eeprom_write(unsigned dev_addr, unsigned offset, uchar *buffer,
unsigned cnt)
{
int page, i = 0, count = 0;
page = offset / 0x100;
i = offset % 0x100;
while (count < cnt) {
if (i2c_write(dev_addr|page, i++, 1, buffer+count++, 1) != 0)
return 1;
if (i > 0xff) {
page++;
i = 0;
}
}
#if defined(CFG_EEPROM_PAGE_WRITE_DELAY_MS)
udelay(CFG_EEPROM_PAGE_WRITE_DELAY_MS * 1000);
#endif
return 0;
}
#ifndef CONFIG_SPI
int eeprom_probe(unsigned dev_addr, unsigned offset)
{
unsigned char chip;
/* Probe the chip address */
#if CFG_I2C_EEPROM_ADDR_LEN == 1 && !defined(CONFIG_SPI_X)
chip = offset >> 8; /* block number */
#else
chip = offset >> 16; /* block number */
#endif /* CFG_I2C_EEPROM_ADDR_LEN, CONFIG_SPI_X */
chip |= dev_addr; /* insert device address */
return (i2c_probe(chip));
}
#endif
#endif
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