mirror of
https://github.com/AsahiLinux/u-boot
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7bb9ea47e1
Store serial number from atsha cryptochip into the serial# env variable. U-Boot automatically puts content of this variable into the root device tree property serial-number when booting Linux kernel. Refactor turris atsha code and from turris_atsha_otp_get_serial_number() function returns directly string suitable for printing or storing into device tree. Because during different boot stages is env storage read-only, it is not possible to always store serial number into env storage. So introduce a new function turris_atsha_otp_init_serial_number() which is called at later stage and which ensures that serial number is correctly stored into env. Signed-off-by: Pali Rohár <pali@kernel.org> Reviewed-by: Marek Behún <kabel@kernel.org> Reviewed-by: Stefan Roese <sr@denx.de>
149 lines
2.8 KiB
C
149 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017 Marek Behún <kabel@kernel.org>
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* Copyright (C) 2016 Tomas Hlavacek <tomas.hlavacek@nic.cz>
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*/
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#include <env.h>
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#include <net.h>
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#include <dm/device.h>
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#include <dm/uclass.h>
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#include <atsha204a-i2c.h>
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#include "turris_atsha_otp.h"
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#define TURRIS_ATSHA_OTP_VERSION 0
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#define TURRIS_ATSHA_OTP_SERIAL 1
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#define TURRIS_ATSHA_OTP_MAC0 3
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#define TURRIS_ATSHA_OTP_MAC1 4
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extern U_BOOT_DRIVER(atsha204);
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static struct udevice *get_atsha204a_dev(void)
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{
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/* Cannot be static because BSS does not have to be ready at this early stage */
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struct udevice *dev;
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if (uclass_get_device_by_driver(UCLASS_MISC, DM_DRIVER_GET(atsha204), &dev)) {
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puts("Cannot find ATSHA204A on I2C bus!\n");
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dev = NULL;
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}
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return dev;
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}
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static void increment_mac(u8 *mac)
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{
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int i;
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for (i = 5; i >= 3; i--) {
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mac[i] += 1;
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if (mac[i])
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break;
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}
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}
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static void set_mac_if_invalid(int i, u8 *mac)
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{
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u8 oldmac[6];
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if (is_valid_ethaddr(mac) &&
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!eth_env_get_enetaddr_by_index("eth", i, oldmac))
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eth_env_set_enetaddr_by_index("eth", i, mac);
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}
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int turris_atsha_otp_init_mac_addresses(int first_idx)
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{
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struct udevice *dev = get_atsha204a_dev();
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u8 mac0[4], mac1[4], mac[6];
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int ret;
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if (!dev)
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return -1;
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ret = atsha204a_wakeup(dev);
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if (ret)
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return ret;
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ret = atsha204a_read(dev, ATSHA204A_ZONE_OTP, false,
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TURRIS_ATSHA_OTP_MAC0, mac0);
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if (ret)
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return ret;
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ret = atsha204a_read(dev, ATSHA204A_ZONE_OTP, false,
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TURRIS_ATSHA_OTP_MAC1, mac1);
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if (ret)
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return ret;
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atsha204a_sleep(dev);
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mac[0] = mac0[1];
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mac[1] = mac0[2];
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mac[2] = mac0[3];
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mac[3] = mac1[1];
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mac[4] = mac1[2];
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mac[5] = mac1[3];
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set_mac_if_invalid((first_idx + 0) % 3, mac);
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increment_mac(mac);
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set_mac_if_invalid((first_idx + 1) % 3, mac);
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increment_mac(mac);
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set_mac_if_invalid((first_idx + 2) % 3, mac);
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return 0;
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}
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int turris_atsha_otp_init_serial_number(void)
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{
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char serial[17];
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int ret;
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ret = turris_atsha_otp_get_serial_number(serial);
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if (ret)
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return ret;
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if (!env_get("serial#"))
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return -1;
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return 0;
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}
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int turris_atsha_otp_get_serial_number(char serial[17])
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{
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struct udevice *dev = get_atsha204a_dev();
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u32 version_num, serial_num;
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const char *serial_env;
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int ret;
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if (!dev)
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return -1;
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serial_env = env_get("serial#");
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if (serial_env && strlen(serial_env) == 16) {
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memcpy(serial, serial_env, 17);
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return 0;
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}
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ret = atsha204a_wakeup(dev);
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if (ret)
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return ret;
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ret = atsha204a_read(dev, ATSHA204A_ZONE_OTP, false,
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TURRIS_ATSHA_OTP_VERSION,
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(u8 *)&version_num);
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if (ret)
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return ret;
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ret = atsha204a_read(dev, ATSHA204A_ZONE_OTP, false,
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TURRIS_ATSHA_OTP_SERIAL,
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(u8 *)&serial_num);
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if (ret)
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return ret;
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atsha204a_sleep(dev);
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sprintf(serial, "%08X%08X", be32_to_cpu(version_num), be32_to_cpu(serial_num));
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env_set("serial#", serial);
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return 0;
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}
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