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trezor-firmware/legacy/firmware/otp.c

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/*
* This file is part of the Trezor project, https://trezor.io/
*
* Copyright (C) 2019 Pavol Rusnak <stick@satoshilabs.com>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "otp.h"
#include <libopencm3/stm32/flash.h>
#define FLASH_OTP_BASE 0x1FFF7800U
#define FLASH_OTP_LOCK_BASE 0x1FFF7A00U
bool flash_otp_is_locked(uint8_t block) {
return 0x00 == *(volatile uint8_t *)(FLASH_OTP_LOCK_BASE + block);
}
bool flash_otp_lock(uint8_t block) {
if (block >= FLASH_OTP_NUM_BLOCKS) {
return false;
}
flash_unlock();
flash_program_byte(FLASH_OTP_LOCK_BASE + block, 0x00);
flash_lock();
return true;
}
bool flash_otp_read(uint8_t block, uint8_t offset, uint8_t *data,
uint8_t datalen) {
if (block >= FLASH_OTP_NUM_BLOCKS ||
offset + datalen > FLASH_OTP_BLOCK_SIZE) {
return false;
}
for (uint8_t i = 0; i < datalen; i++) {
data[i] = *(volatile uint8_t *)(FLASH_OTP_BASE +
block * FLASH_OTP_BLOCK_SIZE + offset + i);
}
return true;
}
bool flash_otp_write(uint8_t block, uint8_t offset, const uint8_t *data,
uint8_t datalen) {
if (block >= FLASH_OTP_NUM_BLOCKS ||
offset + datalen > FLASH_OTP_BLOCK_SIZE) {
return false;
}
flash_unlock();
for (uint8_t i = 0; i < datalen; i++) {
uint32_t address =
FLASH_OTP_BASE + block * FLASH_OTP_BLOCK_SIZE + offset + i;
flash_program_byte(address, data[i]);
}
flash_lock();
return true;
}