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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017 Marek Behun <marek.behun@nic.cz>
* Copyright (C) 2016 Tomas Hlavacek <tomas.hlavacek@nic.cz>
*/
#include <env.h>
#include <net.h>
#include <dm/uclass.h>
#include <atsha204a-i2c.h>
#include "turris_atsha_otp.h"
#define TURRIS_ATSHA_OTP_VERSION 0
#define TURRIS_ATSHA_OTP_SERIAL 1
#define TURRIS_ATSHA_OTP_MAC0 3
#define TURRIS_ATSHA_OTP_MAC1 4
static struct udevice *get_atsha204a_dev(void)
{
/* Cannot be static because BSS does not have to be ready at this early stage */
struct udevice *dev;
if (uclass_get_device_by_name(UCLASS_MISC, "crypto@64", &dev)) {
puts("Cannot find ATSHA204A on I2C bus!\n");
dev = NULL;
}
return dev;
}
static void increment_mac(u8 *mac)
{
int i;
for (i = 5; i >= 3; i--) {
mac[i] += 1;
if (mac[i])
break;
}
}
static void set_mac_if_invalid(int i, u8 *mac)
{
u8 oldmac[6];
if (is_valid_ethaddr(mac) &&
!eth_env_get_enetaddr_by_index("eth", i, oldmac))
eth_env_set_enetaddr_by_index("eth", i, mac);
}
int turris_atsha_otp_init_mac_addresses(int first_idx)
{
struct udevice *dev = get_atsha204a_dev();
u8 mac0[4], mac1[4], mac[6];
int ret;
if (!dev)
return -1;
ret = atsha204a_wakeup(dev);
if (ret)
return ret;
ret = atsha204a_read(dev, ATSHA204A_ZONE_OTP, false,
TURRIS_ATSHA_OTP_MAC0, mac0);
if (ret)
return ret;
ret = atsha204a_read(dev, ATSHA204A_ZONE_OTP, false,
TURRIS_ATSHA_OTP_MAC1, mac1);
if (ret)
return ret;
atsha204a_sleep(dev);
mac[0] = mac0[1];
mac[1] = mac0[2];
mac[2] = mac0[3];
mac[3] = mac1[1];
mac[4] = mac1[2];
mac[5] = mac1[3];
set_mac_if_invalid((first_idx + 0) % 3, mac);
increment_mac(mac);
set_mac_if_invalid((first_idx + 1) % 3, mac);
increment_mac(mac);
set_mac_if_invalid((first_idx + 2) % 3, mac);
return 0;
}
int turris_atsha_otp_get_serial_number(u32 *version_num, u32 *serial_num)
{
struct udevice *dev = get_atsha204a_dev();
int ret;
if (!dev)
return -1;
ret = atsha204a_wakeup(dev);
if (ret)
return ret;
ret = atsha204a_read(dev, ATSHA204A_ZONE_OTP, false,
TURRIS_ATSHA_OTP_VERSION,
(u8 *)version_num);
if (ret)
return ret;
ret = atsha204a_read(dev, ATSHA204A_ZONE_OTP, false,
TURRIS_ATSHA_OTP_SERIAL,
(u8 *)serial_num);
if (ret)
return ret;
atsha204a_sleep(dev);
return 0;
}
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