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/*
* am33xx_bbu_spi_mlo.c - am35xx and am33xx specific MLO
* update handler for SPI NOR flash
*
* Copyright (c) 2013 Sharavn kumar <shravan.k@phytec.in>, Phytec
*
* 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 <linux/stat.h>
#include <mach/bbu.h>
/*
* AM35xx, AM33xx chips use big endian MLO for SPI NOR flash
* This handler converting MLO to big endian and write to SPI NOR
*/
static int spi_nor_mlo_handler(struct bbu_handler *handler,
struct bbu_data *data)
{
int dstfd = 0;
int ret = 0;
uint32_t readbuf;
int size = data->len;
const void *image = data->image;
const uint32_t *header;
int swap = 0;
struct stat s;
header = data->image;
if (header[5] == 0x43485345 || header[10] == 0x62617265) {
swap = 0;
} else if (header[5] == 0x45534843 || header[10] == 0x65726142) {
swap = 1;
} else {
if (!bbu_force(data, "Not a MLO image"))
return -EINVAL;
}
ret = stat(data->devicefile, &s);
if (ret) {
printf("could not open %s: %s", data->devicefile, errno_str());
return ret;
}
if (size > s.st_size) {
printf("Image too big, need %d, have %lld\n", size, s.st_size);
return -ENOSPC;
}
ret = bbu_confirm(data);
if (ret != 0)
return ret;
dstfd = open(data->devicefile, O_WRONLY);
if (dstfd < 0) {
printf("could not open %s: %s", data->devicefile, errno_str());
ret = dstfd;
goto out;
}
ret = erase(dstfd, ERASE_SIZE_ALL, 0);
if (ret < 0) {
printf("could not erase %s: %s", data->devicefile, errno_str());
goto out1;
}
for (; size >= 0; size -= 4) {
memcpy((char *)&readbuf, image, 4);
if (swap)
readbuf = cpu_to_be32(readbuf);
ret = write(dstfd, &readbuf, 4);
if (ret < 0) {
perror("write");
goto out1;
}
image = image + 4;
}
ret = 0;
out1:
close(dstfd);
out:
return ret;
}
/*
* Register a am33xx MLO update handler for SPI NOR
*/
int am33xx_bbu_spi_nor_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 = spi_nor_mlo_handler;
ret = bbu_register_handler(handler);
if (ret)
free(handler);
return ret;
}
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