circuitpython/ports/esp32s2/supervisor/internal_flash.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
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* 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;
void supervisor_flash_init(void) {
_partition = esp_partition_find_first(ESP_PARTITION_TYPE_DATA,
ESP_PARTITION_SUBTYPE_DATA_FAT,
NULL);
_cache_lba = 0xffffffff;
}
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) {
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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) {
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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++;
}
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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) {
}