esp-idf/components/efuse/src/esp32s3/esp_efuse_fields.c

// Copyright 2017-2020 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "esp_efuse.h"
#include "esp_efuse_utility.h"
#include "esp_efuse_table.h"
#include "stdlib.h"
#include "esp_types.h"
#include "assert.h"
#include "esp_err.h"
#include "esp_log.h"
#include "soc/efuse_periph.h"
#include "bootloader_random.h"
#include "sys/param.h"

const static char *TAG = "efuse";

// Contains functions that provide access to efuse fields which are often used in IDF.

// Returns chip version from efuse
uint8_t esp_efuse_get_chip_ver(void)
{
    // should return the same value as bootloader_common_get_chip_revision()
    uint32_t chip_ver = 0;
    // TODO: ESP32S2 does not have this field
    return chip_ver;
}

// Returns chip package from efuse
uint32_t esp_efuse_get_pkg_ver(void)
{
    uint32_t pkg_ver = 0;
    esp_efuse_read_field_blob(ESP_EFUSE_PKG_VERSION, &pkg_ver, 4);
    return pkg_ver;
}

void esp_efuse_write_random_key(uint32_t blk_wdata0_reg)
{
    uint32_t buf[8];
    uint8_t raw[24];

    bootloader_fill_random(buf, sizeof(buf));

    ESP_LOGV(TAG, "Writing random values to address 0x%08x", blk_wdata0_reg);
    for (int i = 0; i < 8; i++) {
        ESP_LOGV(TAG, "EFUSE_BLKx_WDATA%d_REG = 0x%08x", i, buf[i]);
        REG_WRITE(blk_wdata0_reg + 4*i, buf[i]);
    }
    bzero(buf, sizeof(buf));
    bzero(raw, sizeof(raw));
}

esp_err_t esp_efuse_disable_rom_download_mode(void)
{
    return esp_efuse_write_field_bit(ESP_EFUSE_DIS_DOWNLOAD_MODE);
}

esp_err_t esp_efuse_enable_rom_secure_download_mode(void)
{
    if (esp_efuse_read_field_bit(ESP_EFUSE_DIS_DOWNLOAD_MODE)) {
        return ESP_ERR_INVALID_STATE;
    }
    return esp_efuse_write_field_bit(ESP_EFUSE_ENABLE_SECURITY_DOWNLOAD);
}