mtd_native.c
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/*
* Copyright (C) 2016 OTA keys S.A.
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @{
* @brief mtd flash emulation for native
*
* @file
*
* @author Vincent Dupont <vincent@otakeys.com>
*/
#include <stdio.h>
#include <assert.h>
#include <inttypes.h>
#include <errno.h>
#include "mtd.h"
#include "mtd_native.h"
#include "native_internal.h"
#define ENABLE_DEBUG (0)
#include "debug.h"
static int _init(mtd_dev_t *dev)
{
mtd_native_dev_t *_dev = (mtd_native_dev_t*) dev;
DEBUG("mtd_native: init, filename=%s\n", _dev->fname);
FILE *f = real_fopen(_dev->fname, "r");
if (!f) {
DEBUG("mtd_native: init: creating file %s\n", name);
f = real_fopen(_dev->fname, "w+");
if (!f) {
return -EIO;
}
size_t size = dev->sector_count * dev->pages_per_sector * dev->page_size;
for (size_t i = 0; i < size; i++) {
real_fputc(0xff, f);
}
}
real_fclose(f);
return 0;
}
static int _read(mtd_dev_t *dev, void *buff, uint32_t addr, uint32_t size)
{
mtd_native_dev_t *_dev = (mtd_native_dev_t*) dev;
size_t mtd_size = dev->sector_count * dev->pages_per_sector * dev->page_size;
DEBUG("mtd_native: read from page %" PRIu32 " count %" PRIu32 "\n", addr, size);
if (addr + size > mtd_size) {
return -EOVERFLOW;
}
FILE *f = real_fopen(_dev->fname, "r");
if (!f) {
return -EIO;
}
real_fseek(f, addr, SEEK_SET);
size = real_fread(buff, 1, size, f);
real_fclose(f);
return size;
}
static int _write(mtd_dev_t *dev, const void *buff, uint32_t addr, uint32_t size)
{
mtd_native_dev_t *_dev = (mtd_native_dev_t*) dev;
size_t mtd_size = dev->sector_count * dev->pages_per_sector * dev->page_size;
size_t sector_size = dev->pages_per_sector * dev->page_size;
DEBUG("mtd_native: write from page %" PRIu32 " count %" PRIu32 "\n", addr, size);
if (addr + size > mtd_size) {
return -EOVERFLOW;
}
if (((addr % sector_size) + size) > sector_size) {
return -EOVERFLOW;
}
FILE *f = real_fopen(_dev->fname, "r+");
if (!f) {
return -EIO;
}
real_fseek(f, addr, SEEK_SET);
for (size_t i = 0; i < size; i++) {
uint8_t c = real_fgetc(f);
real_fseek(f, -1, SEEK_CUR);
real_fputc(c & ((uint8_t*)buff)[i], f);
}
real_fclose(f);
return size;
}
static int _erase(mtd_dev_t *dev, uint32_t addr, uint32_t size)
{
mtd_native_dev_t *_dev = (mtd_native_dev_t*) dev;
size_t mtd_size = dev->sector_count * dev->pages_per_sector * dev->page_size;
size_t sector_size = dev->pages_per_sector * dev->page_size;
DEBUG("mtd_native: erase from sector %" PRIu32 " count %" PRIu32 "\n", addr, size);
if (addr + size > mtd_size) {
return -EOVERFLOW;
}
if (((addr % sector_size) != 0) || ((size % sector_size) != 0)) {
return -EOVERFLOW;
}
FILE *f = real_fopen(_dev->fname, "r+");
if (!f) {
return -EIO;
}
real_fseek(f, addr, SEEK_SET);
for (size_t i = 0; i < size; i++) {
real_fputc(0xff, f);
}
real_fclose(f);
return 0;
}
static int _power(mtd_dev_t *dev, enum mtd_power_state power)
{
(void) dev;
(void) power;
return -ENOTSUP;
}
const mtd_desc_t native_flash_driver = {
.read = _read,
.power = _power,
.write = _write,
.erase = _erase,
.init = _init,
};
/** @} */