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120 lines
3.1 KiB
C
120 lines
3.1 KiB
C
// Copyright 2015-2021 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/*******************************************************************************
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* NOTICE
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* The ll is not public api, don't use in application code.
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* See readme.md in hal/include/hal/readme.md
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******************************************************************************/
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// The Lowlevel layer for SPI Flash Encryption.
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#include "soc/dport_reg.h"
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#include "soc/flash_encryption_reg.h"
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#include <stdbool.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* Enable encryption in flash
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*/
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static inline void spi_flash_encrypt_ll_enable(void)
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{
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DPORT_REG_SET_BIT(DPORT_SLAVE_SPI_CONFIG_REG, DPORT_SLAVE_SPI_MASK_PRO | DPORT_SPI_ENCRYPT_ENABLE);
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}
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/**
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* Disable encryption in flash
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*/
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static inline void spi_flash_encrypt_ll_disable(void)
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{
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DPORT_REG_CLR_BIT(DPORT_SLAVE_SPI_CONFIG_REG, DPORT_SLAVE_SPI_MASK_PRO | DPORT_SPI_ENCRYPT_ENABLE);
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}
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/**
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* Copy the flash address to physical address
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*
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* @param flash_addr The flash address.
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*
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* @note the address must be 8-byte aligned
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*/
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static inline void spi_flash_encrypt_ll_address_save(uint32_t flash_addr)
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{
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REG_WRITE(FLASH_ENCRYPTION_ADDRESS_REG, flash_addr);
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}
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/**
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* Wait for flash encryption operation completeness.
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*/
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static inline void spi_flash_encrypt_ll_calculate_wait_idle(void)
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{
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while(!(REG_READ(FLASH_ENCRYPTION_DONE_REG) & BIT(0))) {
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}
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}
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/**
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* Start encryption on data buffer.
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*/
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static inline void spi_flash_encrypt_ll_calculate_start(void)
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{
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REG_WRITE(FLASH_ENCRYPTION_START_REG, BIT(0));
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}
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/**
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* Save the plaintext for encryption
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*
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* @param address address of the partition to be written.
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* @param buffer Buffer to store the input data.
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* @param size Buffer size.
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*/
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static inline void spi_flash_encrypt_ll_plaintext_save(uint32_t address, const uint32_t* buffer, uint32_t size)
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{
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for (int i = 0; i < 8; i++) {
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REG_WRITE(FLASH_ENCRYPTION_BUFFER_REG + (i << 2), buffer[i]);
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}
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}
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/**
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* Finish the flash encryption and make encrypted result accessible to SPI.
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*/
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static inline void spi_flash_encrypt_ll_done(void)
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{
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// Do nothing on ESP32
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}
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/**
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* Set to destroy encrypted result
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*/
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static inline void spi_flash_encrypt_ll_destroy(void)
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{
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// Do nothing on ESP32
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}
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/**
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* Check if is qualified to encrypt the buffer
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*
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* @param address the address of written flash partition.
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* @param length Buffer size.
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*/
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static inline bool spi_flash_encrypt_ll_check(uint32_t address, uint32_t length)
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{
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return ((address % 16) == 0) ? true : false;
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}
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#ifdef __cplusplus
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}
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#endif
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