esp-idf/components/bootloader_support/src/bootloader_flash_config_esp32c3.c

// Copyright 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 <stdbool.h>
#include <assert.h>
#include "string.h"
#include "sdkconfig.h"
#include "esp_err.h"
#include "esp_log.h"
#include "esp32c3/rom/gpio.h"
#include "esp32c3/rom/spi_flash.h"
#include "esp32c3/rom/efuse.h"
#include "soc/gpio_periph.h"
#include "soc/efuse_reg.h"
#include "soc/spi_reg.h"
#include "soc/spi_mem_reg.h"
#include "soc/spi_caps.h"
#include "flash_qio_mode.h"
#include "bootloader_flash_config.h"
#include "bootloader_common.h"

#define FLASH_IO_MATRIX_DUMMY_40M   0
#define FLASH_IO_MATRIX_DUMMY_80M   0

void bootloader_flash_update_id()
{
    esp_rom_spiflash_chip_t *chip = &rom_spiflash_legacy_data->chip;
    chip->device_id = bootloader_read_flash_id();
}

void IRAM_ATTR bootloader_flash_cs_timing_config()
{
    SET_PERI_REG_MASK(SPI_MEM_USER_REG(0), SPI_MEM_CS_HOLD_M | SPI_MEM_CS_SETUP_M);
    SET_PERI_REG_BITS(SPI_MEM_CTRL2_REG(0), SPI_MEM_CS_HOLD_TIME_V, 0, SPI_MEM_CS_HOLD_TIME_S);
    SET_PERI_REG_BITS(SPI_MEM_CTRL2_REG(0), SPI_MEM_CS_SETUP_TIME_V, 0, SPI_MEM_CS_SETUP_TIME_S);
    SET_PERI_REG_MASK(SPI_MEM_USER_REG(1), SPI_MEM_CS_HOLD_M | SPI_MEM_CS_SETUP_M);
    SET_PERI_REG_BITS(SPI_MEM_CTRL2_REG(1), SPI_MEM_CS_HOLD_TIME_V, 1, SPI_MEM_CS_HOLD_TIME_S);
    SET_PERI_REG_BITS(SPI_MEM_CTRL2_REG(1), SPI_MEM_CS_SETUP_TIME_V, 0, SPI_MEM_CS_SETUP_TIME_S);
}

void IRAM_ATTR bootloader_flash_clock_config(const esp_image_header_t *pfhdr)
{
    uint32_t spi_clk_div = 0;
    switch (pfhdr->spi_speed) {
    case ESP_IMAGE_SPI_SPEED_80M:
        spi_clk_div = 1;
        break;
    case ESP_IMAGE_SPI_SPEED_40M:
        spi_clk_div = 2;
        break;
    case ESP_IMAGE_SPI_SPEED_26M:
        spi_clk_div = 3;
        break;
    case ESP_IMAGE_SPI_SPEED_20M:
        spi_clk_div = 4;
        break;
    default:
        break;
    }
    esp_rom_spiflash_config_clk(spi_clk_div, 0);
}

void IRAM_ATTR bootloader_flash_set_dummy_out(void)
{
    REG_SET_BIT(SPI_MEM_CTRL_REG(0), SPI_MEM_FDUMMY_OUT | SPI_MEM_D_POL | SPI_MEM_Q_POL);
    REG_SET_BIT(SPI_MEM_CTRL_REG(1), SPI_MEM_FDUMMY_OUT | SPI_MEM_D_POL | SPI_MEM_Q_POL);
}

void IRAM_ATTR bootloader_flash_dummy_config(const esp_image_header_t *pfhdr)
{
    bootloader_configure_spi_pins(1);
    bootloader_flash_set_dummy_out();
}