circuitpython/ports/nrf/supervisor/internal_flash.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
*
* 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/flash.h"
#include <stdint.h>
#include <string.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 "nrf_nvmc.h"
#ifdef BLUETOOTH_SD
#include "nrf_sdm.h"
#endif
// defined in linker
extern uint32_t __fatfs_flash_start_addr[];
extern uint32_t __fatfs_flash_length[];
#define NO_CACHE 0xffffffff
#define FL_PAGE_SZ 4096
uint8_t _flash_cache[FL_PAGE_SZ] __attribute__((aligned(4)));
uint32_t _flash_page_addr = NO_CACHE;
/*------------------------------------------------------------------*/
/* Internal Flash API
*------------------------------------------------------------------*/
static inline uint32_t lba2addr(uint32_t block) {
return ((uint32_t)__fatfs_flash_start_addr) + block * FILESYSTEM_BLOCK_SIZE;
}
void supervisor_flash_init(void) {
}
uint32_t supervisor_flash_get_block_size(void) {
return FILESYSTEM_BLOCK_SIZE;
}
uint32_t supervisor_flash_get_block_count(void) {
return ((uint32_t) __fatfs_flash_length) / FILESYSTEM_BLOCK_SIZE ;
}
// TODO support flashing with SD enabled
void supervisor_flash_flush(void) {
if (_flash_page_addr == NO_CACHE) return;
// Skip if data is the same
if (memcmp(_flash_cache, (void *)_flash_page_addr, FL_PAGE_SZ) != 0) {
// _is_flashing = true;
nrf_nvmc_page_erase(_flash_page_addr);
nrf_nvmc_write_words(_flash_page_addr, (uint32_t *)_flash_cache, FL_PAGE_SZ / sizeof(uint32_t));
}
_flash_page_addr = NO_CACHE;
}
mp_uint_t supervisor_flash_read_blocks(uint8_t *dest, uint32_t block, uint32_t num_blocks) {
uint32_t src = lba2addr(block);
memcpy(dest, (uint8_t*) src, FILESYSTEM_BLOCK_SIZE*num_blocks);
return 0; // success
}
mp_uint_t supervisor_flash_write_blocks(const uint8_t *src, uint32_t lba, uint32_t num_blocks) {
while (num_blocks) {
uint32_t const addr = lba2addr(lba);
uint32_t const page_addr = addr & ~(FL_PAGE_SZ - 1);
uint32_t count = 8 - (lba % 8); // up to page boundary
count = MIN(num_blocks, count);
if (page_addr != _flash_page_addr) {
supervisor_flash_flush();
// writing previous cached data, skip current data until flashing is done
// tinyusb stack will invoke write_block() with the same parameters later on
// if ( _is_flashing ) return;
_flash_page_addr = page_addr;
memcpy(_flash_cache, (void *)page_addr, FL_PAGE_SZ);
}
memcpy(_flash_cache + (addr & (FL_PAGE_SZ - 1)), src, count * FILESYSTEM_BLOCK_SIZE);
// adjust for next run
lba += count;
src += count * FILESYSTEM_BLOCK_SIZE;
num_blocks -= count;
}
return 0; // success
}