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/*
* Copyright (C) 2011 Sascha Hauer, Pengutronix
* Copyright (C) 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnio@jcrosoft.com>
*
* Under GPLv2
*/
#include <common.h>
#include <partition.h>
#include <nand.h>
#include <driver.h>
#include <linux/mtd/mtd.h>
#include <fcntl.h>
#include <filetype.h>
#include <linux/sizes.h>
#include <errno.h>
#include <malloc.h>
#include <bootstrap.h>
#if defined(CONFIG_ARM) || defined(CONFIG_MIPS)
#if defined(CONFIG_ARM)
#define BAREBOX_HEAD_SIZE ARM_HEAD_SIZE
#define BAREBOX_HEAD_SIZE_OFFSET ARM_HEAD_SIZE_OFFSET
#elif defined(CONFIG_MIPS)
#define BAREBOX_HEAD_SIZE MIPS_HEAD_SIZE
#define BAREBOX_HEAD_SIZE_OFFSET MIPS_HEAD_SIZE_OFFSET
#endif
static void *read_image_head(const char *name)
{
void *header = xmalloc(BAREBOX_HEAD_SIZE);
struct cdev *cdev;
int ret;
cdev = cdev_open_by_name(name, O_RDONLY);
if (!cdev) {
bootstrap_err("failed to open partition\n");
goto free_header;
}
ret = cdev_read(cdev, header, BAREBOX_HEAD_SIZE, 0, 0);
cdev_close(cdev);
if (ret != BAREBOX_HEAD_SIZE) {
bootstrap_err("failed to read from partition\n");
goto free_header;
}
return header;
free_header:
free(header);
return NULL;
}
static unsigned int get_image_size(void *head)
{
unsigned int ret = 0;
unsigned int *psize = head + BAREBOX_HEAD_SIZE_OFFSET;
if (is_barebox_head(head)) {
ret = *psize;
if (!ret)
bootstrap_err(
"image has correct magic, but the length is zero\n");
}
debug("Detected barebox image size %u\n", ret);
return ret;
}
#else
static void *read_image_head(const char *name)
{
return NULL;
}
static unsigned int get_image_size(void *head)
{
return 0;
}
#endif
void* bootstrap_read_devfs(char *devname, bool use_bb, int offset,
int default_size, int max_size, size_t *bufsize)
{
int ret;
int size = 0;
void *to, *header, *result = NULL;
struct cdev *cdev, *partition;
char *partname = "x";
partition = devfs_add_partition(devname, offset, max_size,
DEVFS_PARTITION_FIXED, partname);
if (IS_ERR(partition)) {
bootstrap_err("%s: failed to add partition (%ld)\n",
devname, PTR_ERR(partition));
return NULL;
}
if (use_bb) {
ret = dev_add_bb_dev(partname, "bbx");
if (ret) {
bootstrap_err(
"%s: failed to add bad block aware partition (%d)\n",
devname, ret);
goto delete_devfs_partition;
}
partname = "bbx";
}
header = read_image_head(partname);
if (header) {
size = get_image_size(header);
if (!size)
bootstrap_err("%s: failed to get image size\n", devname);
}
if (!size) {
size = default_size;
bootstrap_err("%s: failed to detect barebox and it's image size so use %d\n",
devname, size);
}
to = xmalloc(size);
cdev = cdev_open_by_name(partname, O_RDONLY);
if (!cdev) {
bootstrap_err("%s: failed to open %s\n", devname, partname);
goto free_memory;
}
ret = cdev_read(cdev, to, size, 0, 0);
cdev_close(cdev);
if (ret != size) {
bootstrap_err("%s: failed to read from %s\n", devname, partname);
} else {
result = to;
if (bufsize)
*bufsize = size;
}
free_memory:
free(header);
if (!result)
free(to);
if (use_bb) {
dev_remove_bb_dev(partname);
partname = "x";
}
delete_devfs_partition:
devfs_del_partition(partname);
return result;
}
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