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flash_img.c
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flash_img.c
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/*
* Copyright (c) 2017 Nordic Semiconductor ASA
* Copyright (c) 2017 Linaro Limited
*
* SPDX-License-Identifier: Apache-2.0
*/
#define LOG_MODULE_NAME fota_flash_block
#define LOG_LEVEL CONFIG_IMG_MANAGER_LOG_LEVEL
#include <logging/log.h>
LOG_MODULE_REGISTER(LOG_MODULE_NAME);
#include <zephyr/types.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <dfu/flash_img.h>
#include <inttypes.h>
#ifdef CONFIG_IMG_ERASE_PROGRESSIVELY
#include <dfu/mcuboot.h>
#include <flash.h>
#endif
BUILD_ASSERT_MSG((CONFIG_IMG_BLOCK_BUF_SIZE % DT_FLASH_WRITE_BLOCK_SIZE == 0),
"CONFIG_IMG_BLOCK_BUF_SIZE is not a multiple of "
"DT_FLASH_WRITE_BLOCK_SIZE");
static bool flash_verify(const struct flash_area *fa, off_t offset,
u8_t *data, size_t len)
{
size_t size;
u32_t temp;
int rc;
while (len) {
size = (len >= sizeof(temp)) ? sizeof(temp) : len;
rc = flash_area_read(fa, offset, &temp, size);
if (rc) {
LOG_ERR("flash_read error %d offset=0x%08x",
rc, (u32_t)offset);
break;
}
if (memcmp(data, &temp, size)) {
LOG_ERR("offset=0x%08x VERIFY FAIL. "
"expected: 0x%08x, actual: 0x%08x",
(u32_t)offset, temp, UNALIGNED_GET(data));
break;
}
len -= size;
offset += size;
data += size;
}
return (len == 0) ? true : false;
}
#ifdef CONFIG_IMG_ERASE_PROGRESSIVELY
static int flash_sector_from_off(struct flash_area const *fap, off_t off,
struct flash_sector *sector)
{
struct flash_pages_info page;
struct device *flash_dev;
int rc = -ENODEV;
flash_dev = flash_area_get_device(fap);
if (flash_dev) {
rc = flash_get_page_info_by_offs(flash_dev, off, &page);
if (rc == 0) {
sector->fs_off = page.start_offset;
sector->fs_size = page.size;
}
}
return rc;
}
/**
* Erase the image slot progressively
*
* This function erases a flash page to which offset belongs if only this page
* wasn't erased before.
*
* @param[in] ctx context of the image collection process.
* @param[in] off offset from the beginning of the image flash area beginning
*
* @return 0 on success, negative errno code on fail.
*/
static int flash_progressive_erase(struct flash_img_context *ctx, off_t off)
{
struct flash_sector sector;
int rc;
rc = flash_sector_from_off(ctx->flash_area, off, §or);
if (rc) {
LOG_ERR("Unable to determine flash sector size");
} else {
if (ctx->off_last != sector.fs_off) {
ctx->off_last = sector.fs_off;
LOG_INF("Erasing sector at offset 0x%x", sector.fs_off);
rc = flash_area_erase(ctx->flash_area, sector.fs_off,
sector.fs_size);
if (rc) {
LOG_ERR("Error %d while erasing sector", rc);
}
}
}
return rc;
}
#endif /* CONFIG_IMG_ERASE_PROGRESSIVELY */
static int flash_sync(struct flash_img_context *ctx)
{
int rc = 0;
if (ctx->buf_bytes < CONFIG_IMG_BLOCK_BUF_SIZE) {
(void)memset(ctx->buf + ctx->buf_bytes, 0xFF,
CONFIG_IMG_BLOCK_BUF_SIZE - ctx->buf_bytes);
}
#ifdef CONFIG_IMG_ERASE_PROGRESSIVELY
flash_progressive_erase(ctx, ctx->bytes_written +
CONFIG_IMG_BLOCK_BUF_SIZE);
#endif
rc = flash_area_write(ctx->flash_area, ctx->bytes_written, ctx->buf,
CONFIG_IMG_BLOCK_BUF_SIZE);
if (rc) {
LOG_ERR("flash_write error %d offset=0x%08x", rc,
(u32_t)ctx->bytes_written);
return rc;
}
if (!flash_verify(ctx->flash_area, ctx->bytes_written, ctx->buf,
CONFIG_IMG_BLOCK_BUF_SIZE)) {
return -EIO;
}
ctx->bytes_written += ctx->buf_bytes;
ctx->buf_bytes = 0U;
return rc;
}
int flash_img_buffered_write(struct flash_img_context *ctx, u8_t *data,
size_t len, bool flush)
{
int processed = 0;
int rc = 0;
int buf_empty_bytes;
while ((len - processed) >
(buf_empty_bytes = CONFIG_IMG_BLOCK_BUF_SIZE - ctx->buf_bytes)) {
memcpy(ctx->buf + ctx->buf_bytes, data + processed,
buf_empty_bytes);
ctx->buf_bytes = CONFIG_IMG_BLOCK_BUF_SIZE;
rc = flash_sync(ctx);
if (rc) {
return rc;
}
processed += buf_empty_bytes;
}
/* place rest of the data into ctx->buf */
if (processed < len) {
memcpy(ctx->buf + ctx->buf_bytes,
data + processed, len - processed);
ctx->buf_bytes += len - processed;
}
if (!flush) {
return rc;
}
if (ctx->buf_bytes > 0) {
/* pad the rest of ctx->buf and write it out */
rc = flash_sync(ctx);
if (rc) {
return rc;
}
}
#ifdef CONFIG_IMG_ERASE_PROGRESSIVELY
/* erase the image trailer area if it was not erased */
flash_progressive_erase(ctx,
BOOT_TRAILER_IMG_STATUS_OFFS(ctx->flash_area));
#endif
flash_area_close(ctx->flash_area);
ctx->flash_area = NULL;
return rc;
}
size_t flash_img_bytes_written(struct flash_img_context *ctx)
{
return ctx->bytes_written;
}
int flash_img_init(struct flash_img_context *ctx)
{
ctx->bytes_written = 0;
ctx->buf_bytes = 0U;
#ifdef CONFIG_IMG_ERASE_PROGRESSIVELY
ctx->off_last = -1;
#endif
return flash_area_open(DT_FLASH_AREA_IMAGE_1_ID,
(const struct flash_area **)&(ctx->flash_area));
}