mirror of
https://github.com/trezor/trezor-firmware.git
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68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
/*
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* This file is part of the Trezor project, https://trezor.io/
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*
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* Copyright (C) 2019 Pavol Rusnak <stick@satoshilabs.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "otp.h"
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#include <libopencm3/stm32/flash.h>
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#define FLASH_OTP_BASE 0x1FFF7800U
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#define FLASH_OTP_LOCK_BASE 0x1FFF7A00U
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bool flash_otp_is_locked(uint8_t block) {
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return 0x00 == *(volatile uint8_t *)(FLASH_OTP_LOCK_BASE + block);
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}
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bool flash_otp_lock(uint8_t block) {
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if (block >= FLASH_OTP_NUM_BLOCKS) {
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return false;
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}
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flash_unlock();
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flash_program_byte(FLASH_OTP_LOCK_BASE + block, 0x00);
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flash_lock();
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return true;
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}
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bool flash_otp_read(uint8_t block, uint8_t offset, uint8_t *data,
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uint8_t datalen) {
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if (block >= FLASH_OTP_NUM_BLOCKS ||
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offset + datalen > FLASH_OTP_BLOCK_SIZE) {
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return false;
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}
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for (uint8_t i = 0; i < datalen; i++) {
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data[i] = *(volatile uint8_t *)(FLASH_OTP_BASE +
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block * FLASH_OTP_BLOCK_SIZE + offset + i);
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}
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return true;
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}
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bool flash_otp_write(uint8_t block, uint8_t offset, const uint8_t *data,
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uint8_t datalen) {
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if (block >= FLASH_OTP_NUM_BLOCKS ||
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offset + datalen > FLASH_OTP_BLOCK_SIZE) {
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return false;
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}
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flash_unlock();
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for (uint8_t i = 0; i < datalen; i++) {
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uint32_t address =
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FLASH_OTP_BASE + block * FLASH_OTP_BLOCK_SIZE + offset + i;
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flash_program_byte(address, data[i]);
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}
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flash_lock();
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return true;
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}
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