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/*
* Copyright (c) 2015 Phytec Messtechnik GmbH
* Author: Daniel Schultz <d.schultz@phytec.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <common.h>
#include <malloc.h>
#include <bbu.h>
#include <fs.h>
#include <fcntl.h>
#include <filetype.h>
#define PART_TABLE_SIZE 66
#define PART_TABLE_OFFSET 0x1BE
static int emmc_mlo_handler(struct bbu_handler *handler, struct bbu_data *data)
{
int ret = 0;
int i = 0;
int fd;
const void *image = data->image;
size_t size = data->len;
u8 part_table[PART_TABLE_SIZE];
if (file_detect_type(image, size) != filetype_ch_image) {
pr_err("%s is not a valid ch-image\n", data->imagefile);
return -EINVAL;
}
ret = bbu_confirm(data);
if (ret != 0)
return ret;
fd = open(handler->devicefile, O_RDWR);
if (fd < 0) {
pr_err("could not open %s: %s\n", handler->devicefile,
errno_str());
return fd;
}
/* save the partition table */
ret = pread(fd, part_table, PART_TABLE_SIZE, PART_TABLE_OFFSET);
if (ret < 0) {
pr_err("could not read partition table from fd %s: %s\n",
handler->devicefile, errno_str());
goto error;
}
/* write the MLOs */
for (i = 0; i < 4; i++) {
ret = pwrite(fd, image, size, i * 0x20000);
if (ret < 0) {
pr_err("could not write MLO %i/4 to fd %s: %s\n",
i + 1, handler->devicefile, errno_str());
goto error_save_part_table;
}
}
error_save_part_table:
/* write the partition table back */
ret = pwrite(fd, part_table, PART_TABLE_SIZE, PART_TABLE_OFFSET);
if (ret < 0)
pr_err("could not write partition table to fd %s: %s\n",
handler->devicefile, errno_str());
error:
close(fd);
return (ret > 0) ? 0 : ret;
}
int am33xx_bbu_emmc_mlo_register_handler(const char *name, char *devicefile)
{
struct bbu_handler *handler;
int ret;
handler = xzalloc(sizeof(*handler));
handler->devicefile = devicefile;
handler->name = name;
handler->handler = emmc_mlo_handler;
ret = bbu_register_handler(handler);
if (ret)
free(handler);
return ret;
}
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