circuitpython/ports/esp32s2/supervisor/internal_flash.c

/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * SPDX-FileCopyrightText: Copyright (c) 2013, 2014 Damien P. George
 * Copyright (c) 2019 Lucian Copeland for Adafruit Industries
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include "supervisor/internal_flash.h"

#include <stdint.h>
#include <string.h>
#include <stdbool.h>

#include "extmod/vfs.h"
#include "extmod/vfs_fat.h"
#include "py/mphal.h"
#include "py/obj.h"
#include "py/runtime.h"
#include "lib/oofatfs/ff.h"

#include "esp-idf/components/spi_flash/include/esp_partition.h"

#include "supervisor/usb.h"

STATIC const esp_partition_t * _partition;

// TODO: Split the caching out of supervisor/shared/external_flash so we can use it.
#define SECTOR_SIZE 4096
STATIC uint8_t _cache[SECTOR_SIZE];
STATIC uint32_t _cache_lba = 0xffffffff;

void supervisor_flash_init(void) {
    _partition = esp_partition_find_first(ESP_PARTITION_TYPE_DATA,
                                          ESP_PARTITION_SUBTYPE_DATA_FAT,
                                          NULL);
}

uint32_t supervisor_flash_get_block_size(void) {
    return FILESYSTEM_BLOCK_SIZE;
}

uint32_t supervisor_flash_get_block_count(void) {
    return _partition->size / FILESYSTEM_BLOCK_SIZE;
}

void port_internal_flash_flush(void) {

}

mp_uint_t supervisor_flash_read_blocks(uint8_t *dest, uint32_t block, uint32_t num_blocks) {
    esp_partition_read(_partition,
                       block * FILESYSTEM_BLOCK_SIZE,
                       dest,
                       num_blocks * FILESYSTEM_BLOCK_SIZE);
    return 0;
}

mp_uint_t supervisor_flash_write_blocks(const uint8_t *src, uint32_t lba, uint32_t num_blocks) {
    uint32_t blocks_per_sector = SECTOR_SIZE / FILESYSTEM_BLOCK_SIZE;
    uint32_t block = 0;
    while (block < num_blocks) {
        uint32_t block_address = lba + block;
        uint32_t sector_offset = block_address / blocks_per_sector * SECTOR_SIZE;
        uint8_t block_offset = block_address % blocks_per_sector;

        if (_cache_lba != block_address) {
            esp_partition_read(_partition,
                               sector_offset,
                               _cache,
                               SECTOR_SIZE);
            _cache_lba = sector_offset;
        }
        for (uint8_t b = block_offset; b < blocks_per_sector; b++) {
            // Stop copying after the last block.
            if (block >= num_blocks) {
              break;
            }
            memcpy(_cache + b * FILESYSTEM_BLOCK_SIZE,
                   src + block * FILESYSTEM_BLOCK_SIZE,
                   FILESYSTEM_BLOCK_SIZE);
            block++;
        }
        esp_partition_erase_range(_partition, sector_offset, SECTOR_SIZE);
        esp_partition_write(_partition,
                            sector_offset,
                            _cache,
                            SECTOR_SIZE);
    }

    return 0; // success
}

void supervisor_flash_release_cache(void) {
}