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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2013 Vladimir Serbinenko
*
* 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; version 2 of the License.
*
* 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.
*/
#include <types.h>
#include <string.h>
#include <arch/io.h>
#include <device/device.h>
#include <device/smbus.h>
#include <smbios.h>
#include <console/console.h>
static void at24rf08c_init(struct device *dev)
{
int i, j;
if (!dev->enabled)
return;
/* Ensure that EEPROM/RFID chip is not accessible through RFID.
Need to do it only on 5c. */
if (dev->path.type != DEVICE_PATH_I2C || dev->path.i2c.device != 0x5c)
return;
printk (BIOS_DEBUG, "Locking EEPROM RFID\n");
for (i = 0; i < 8; i++)
{
/* After a register write AT24RF08C sometimes stops responding.
Retry several times in case of failure.
*/
for (j = 0; j < 100; j++)
if (smbus_write_byte(dev, i, 0x0f) >= 0)
break;
}
printk (BIOS_DEBUG, "init EEPROM done\n");
}
static struct device_operations at24rf08c_operations = {
.read_resources = DEVICE_NOOP,
.set_resources = DEVICE_NOOP,
.enable_resources = DEVICE_NOOP,
.init = at24rf08c_init,
};
static void enable_dev(struct device *dev)
{
dev->ops = &at24rf08c_operations;
}
struct chip_operations drivers_i2c_at24rf08c_ops = {
CHIP_NAME("AT24RF08C")
.enable_dev = enable_dev,
};
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