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* Copyright (c) 2016 Intel Corporation.
*
* 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 <string.h>
#include <stdint.h>
#include <misc/__assert.h>
#include <misc/util.h>
#include <diskio.h>
#include <ff.h>
#include <device.h>
#include <flash.h>
static struct device *flash_dev;
/* flash read-copy-erase-write operation */
static uint8_t read_copy_buf[CONFIG_FS_BLOCK_SIZE];
static uint8_t *fs_buff = read_copy_buf;
/* calculate number of blocks required for a given size */
#define GET_NUM_BLOCK(total_size, block_size) \
((total_size + block_size - 1) / block_size)
#define GET_SIZE_TO_BOUNDARY(start, block_size) \
(block_size - (start & (block_size - 1)))
static off_t lba_to_address(uint32_t sector_num)
{
off_t flash_addr;
flash_addr = CONFIG_FS_FLASH_START + sector_num * _MIN_SS;
__ASSERT(flash_addr < (CONFIG_FS_FLASH_START + CONFIG_FS_VOLUME_SIZE),
"FS bound error");
return flash_addr;
}
DSTATUS fat_disk_status(void)
{
if (!flash_dev) {
return STA_NOINIT;
}
return RES_OK;
}
DSTATUS fat_disk_initialize(void)
{
if (flash_dev) {
return RES_OK;
}
flash_dev = device_get_binding(CONFIG_FS_FLASH_DEV_NAME);
if (!flash_dev) {
return STA_NOINIT;
}
return RES_OK;
}
DRESULT fat_disk_read(void *buff, uint32_t start_sector,
uint32_t sector_count)
{
off_t fl_addr;
uint32_t remaining;
uint32_t len;
uint32_t num_read;
fl_addr = lba_to_address(start_sector);
remaining = (sector_count * _MIN_SS);
len = CONFIG_FS_FLASH_MAX_RW_SIZE;
num_read = GET_NUM_BLOCK(remaining, CONFIG_FS_FLASH_MAX_RW_SIZE);
for (uint32_t i = 0; i < num_read; i++) {
if (remaining < CONFIG_FS_FLASH_MAX_RW_SIZE) {
len = remaining;
}
if (flash_read(flash_dev, fl_addr, buff, len) != 0) {
return RES_ERROR;
}
fl_addr += len;
buff += len;
remaining -= len;
}
return RES_OK;
}
/* This performs read-copy into an output buffer */
static DRESULT read_copy_flash_block(off_t start_addr, uint32_t size,
const void *src_buff,
uint8_t *dest_buff)
{
off_t fl_addr;
uint32_t num_read;
uint32_t offset = 0;
/* adjust offset if starting address is not erase-aligned address */
if (start_addr & (CONFIG_FS_FLASH_ERASE_ALIGNMENT - 1)) {
offset = start_addr & (CONFIG_FS_FLASH_ERASE_ALIGNMENT - 1);
}
/* align starting address to an aligned address for flash erase-write */
fl_addr = ROUND_DOWN(start_addr, CONFIG_FS_FLASH_ERASE_ALIGNMENT);
num_read = GET_NUM_BLOCK(CONFIG_FS_BLOCK_SIZE,
CONFIG_FS_FLASH_MAX_RW_SIZE);
/* read one block from flash */
for (uint32_t i = 0; i < num_read; i++) {
if (flash_read(flash_dev,
fl_addr + (CONFIG_FS_FLASH_MAX_RW_SIZE * i),
dest_buff + (CONFIG_FS_FLASH_MAX_RW_SIZE * i),
CONFIG_FS_FLASH_MAX_RW_SIZE) != 0) {
return RES_ERROR;
}
}
/* overwrite with user data */
memcpy(dest_buff + offset, src_buff, size);
return RES_OK;
}
/* input size is either less or equal to a block size, CONFIG_FS_BLOCK_SIZE. */
static DRESULT update_flash_block(off_t start_addr, uint32_t size,
const void *buff)
{
off_t fl_addr;
uint8_t *src = (uint8_t *)buff;
uint32_t num_write;
/* if size is a partial block, perform read-copy with user data */
if (size < CONFIG_FS_BLOCK_SIZE) {
if (read_copy_flash_block(start_addr, size, buff, fs_buff) !=
RES_OK) {
return RES_ERROR;
}
/* now use the local buffer as the source */
src = (uint8_t *)fs_buff;
}
/* always align starting address for flash write operation */
fl_addr = ROUND_DOWN(start_addr, CONFIG_FS_FLASH_ERASE_ALIGNMENT);
/* disable write-protection first before erase */
flash_write_protection_set(flash_dev, false);
if (flash_erase(flash_dev, fl_addr, CONFIG_FS_BLOCK_SIZE) != 0) {
return RES_ERROR;
}
/* write data to flash */
num_write = GET_NUM_BLOCK(CONFIG_FS_BLOCK_SIZE,
CONFIG_FS_FLASH_MAX_RW_SIZE);
for (uint32_t i = 0; i < num_write; i++) {
/* flash_write reenabled write-protection so disable it again */
flash_write_protection_set(flash_dev, false);
if (flash_write(flash_dev, fl_addr, src,
CONFIG_FS_FLASH_MAX_RW_SIZE) != 0) {
return RES_ERROR;
}
fl_addr += CONFIG_FS_FLASH_MAX_RW_SIZE;
src += CONFIG_FS_FLASH_MAX_RW_SIZE;
}
return RES_OK;
}
DRESULT fat_disk_write(const void *buff, uint32_t start_sector,
uint32_t sector_count)
{
off_t fl_addr;
uint32_t remaining;
uint32_t size;
fl_addr = lba_to_address(start_sector);
remaining = (sector_count * _MIN_SS);
/* check if start address is erased-aligned address */
if (fl_addr & (CONFIG_FS_FLASH_ERASE_ALIGNMENT - 1)) {
/* not aligned */
/* check if the size goes over flash block boundary */
if ((fl_addr + remaining) <
((fl_addr + CONFIG_FS_BLOCK_SIZE) &
~(CONFIG_FS_BLOCK_SIZE - 1))) {
/* not over block boundary (a partial block also) */
if (update_flash_block(fl_addr, remaining, buff) != 0) {
return RES_ERROR;
}
return RES_OK;
}
/* write goes over block boundary */
size = GET_SIZE_TO_BOUNDARY(fl_addr, CONFIG_FS_BLOCK_SIZE);
/* write first partial block */
if (update_flash_block(fl_addr, size, buff) != 0) {
return RES_ERROR;
}
fl_addr += size;
remaining -= size;
buff += size;
}
/* start is an erase-aligned address */
while (remaining) {
if (remaining < CONFIG_FS_BLOCK_SIZE) {
break;
}
if (update_flash_block(fl_addr, CONFIG_FS_BLOCK_SIZE,
buff) != 0) {
return RES_ERROR;
}
fl_addr += CONFIG_FS_BLOCK_SIZE;
remaining -= CONFIG_FS_BLOCK_SIZE;
buff += CONFIG_FS_BLOCK_SIZE;
}
/* remaining partial block */
if (remaining) {
if (update_flash_block(fl_addr, remaining, buff) != 0) {
return RES_ERROR;
}
}
return RES_OK;
}
DRESULT fat_disk_ioctl(uint8_t cmd, void *buff)
{
switch (cmd) {
case CTRL_SYNC:
return RES_OK;
case GET_SECTOR_COUNT:
*(uint32_t *)buff = CONFIG_FS_VOLUME_SIZE / _MIN_SS;
return RES_OK;
case GET_BLOCK_SIZE: /* in sectors */
*(uint32_t *)buff = CONFIG_FS_BLOCK_SIZE / _MIN_SS;
return RES_OK;
case CTRL_TRIM:
break;
}
return RES_PARERR;
}
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