esp-idf/components/bootloader_support/src/bootloader_flash_config_esp32s2beta.c

// Copyright 2019 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 "esp32/rom/gpio.h"
#include "esp32/rom/spi_flash.h"
#include "esp32/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"

void bootloader_flash_update_id()
{
    g_rom_flashchip.device_id = bootloader_read_flash_id();
}

void IRAM_ATTR bootloader_flash_cs_timing_config()
{
    SET_PERI_REG_MASK(SPI_USER_REG(0), SPI_CS_HOLD_M | SPI_CS_SETUP_M);
    SET_PERI_REG_BITS(SPI_CTRL2_REG(0), SPI_CS_HOLD_TIME_V, 1, SPI_CS_HOLD_TIME_S);
    SET_PERI_REG_BITS(SPI_CTRL2_REG(0), SPI_CS_SETUP_TIME_V, 0, SPI_CS_SETUP_TIME_S);
    SET_PERI_REG_MASK(SPI_USER_REG(1), SPI_CS_HOLD_M | SPI_CS_SETUP_M);
    SET_PERI_REG_BITS(SPI_CTRL2_REG(1), SPI_CS_HOLD_TIME_V, 1, SPI_CS_HOLD_TIME_S);
    SET_PERI_REG_BITS(SPI_CTRL2_REG(1), SPI_CS_SETUP_TIME_V, 0, SPI_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_gpio_config(const esp_image_header_t* pfhdr)
{

}

void IRAM_ATTR bootloader_flash_dummy_config(const esp_image_header_t* pfhdr)
{
    int spi_cache_dummy = 0;
    uint32_t modebit = READ_PERI_REG(SPI_CTRL_REG(0));
    if (modebit & SPI_FAST_RD_MODE) {
        if (modebit & SPI_FREAD_QUAD) {    //SPI mode is QIO
            spi_cache_dummy = SPI0_R_QIO_DUMMY_CYCLELEN;
        } else if (modebit & SPI_FREAD_DUAL) {    //SPI mode is DIO
            spi_cache_dummy = SPI0_R_DIO_DUMMY_CYCLELEN;
            SET_PERI_REG_BITS(SPI_USER1_REG(0), SPI_USR_ADDR_BITLEN_V, SPI0_R_DIO_ADDR_BITSLEN, SPI_USR_ADDR_BITLEN_S);
        } else if(modebit & (SPI_FREAD_QUAD | SPI_FREAD_DUAL))  {    //SPI mode is QOUT or DIO
            spi_cache_dummy = SPI0_R_FAST_DUMMY_CYCLELEN;
        }
    }

    extern uint8_t g_rom_spiflash_dummy_len_plus[];
    switch (pfhdr->spi_speed) {
        case ESP_IMAGE_SPI_SPEED_80M:
            g_rom_spiflash_dummy_len_plus[0] = ESP_ROM_SPIFLASH_DUMMY_LEN_PLUS_80M;
            g_rom_spiflash_dummy_len_plus[1] = ESP_ROM_SPIFLASH_DUMMY_LEN_PLUS_80M;
            break;
        case ESP_IMAGE_SPI_SPEED_40M:
            g_rom_spiflash_dummy_len_plus[0] = ESP_ROM_SPIFLASH_DUMMY_LEN_PLUS_40M;
            g_rom_spiflash_dummy_len_plus[1] = ESP_ROM_SPIFLASH_DUMMY_LEN_PLUS_40M;
            break;
        case ESP_IMAGE_SPI_SPEED_26M:
        case ESP_IMAGE_SPI_SPEED_20M:
            g_rom_spiflash_dummy_len_plus[0] = ESP_ROM_SPIFLASH_DUMMY_LEN_PLUS_20M;
            g_rom_spiflash_dummy_len_plus[1] = ESP_ROM_SPIFLASH_DUMMY_LEN_PLUS_20M;
            break;
        default:
            break;
    }


#define FLASH_IO_MATRIX_DUMMY_40M   0
#define FLASH_IO_MATRIX_DUMMY_80M   0

    SET_PERI_REG_BITS(SPI_MEM_USER1_REG(0), SPI_MEM_USR_DUMMY_CYCLELEN_V, spi_cache_dummy + FLASH_IO_MATRIX_DUMMY_80M,
                      SPI_MEM_USR_DUMMY_CYCLELEN_S);  //DUMMY

}