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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2021 Rafał Miłecki <rafal@milecki.pl>
*/
#include <linux/init.h>
#include <linux/jffs2.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/of.h>
#include <linux/slab.h>
#include "mtdsplit.h"
#define je16_to_cpu(x) ((x).v16)
#define je32_to_cpu(x) ((x).v32)
#define NR_PARTS 1
static int mtdsplit_cfe_bootfs_parse(struct mtd_info *mtd,
const struct mtd_partition **pparts,
struct mtd_part_parser_data *data)
{
struct jffs2_raw_dirent node;
enum mtdsplit_part_type type;
struct mtd_partition *parts;
size_t rootfs_offset;
size_t retlen;
size_t offset;
int err;
/* Don't parse backup partitions */
if (strcmp(mtd->name, "firmware"))
return -EINVAL;
/* Find the end of JFFS2 bootfs partition */
offset = 0;
do {
err = mtd_read(mtd, offset, sizeof(node), &retlen, (void *)&node);
if (err || retlen != sizeof(node))
break;
if (je16_to_cpu(node.magic) != JFFS2_MAGIC_BITMASK)
break;
offset += je32_to_cpu(node.totlen);
offset = (offset + 0x3) & ~0x3;
} while (offset < mtd->size);
/* Find rootfs partition that follows the bootfs */
err = mtd_find_rootfs_from(mtd, mtd->erasesize, mtd->size, &rootfs_offset, &type);
if (err)
return err;
parts = kzalloc(NR_PARTS * sizeof(*parts), GFP_KERNEL);
if (!parts)
return -ENOMEM;
if (type == MTDSPLIT_PART_TYPE_UBI)
parts[0].name = UBI_PART_NAME;
else
parts[0].name = ROOTFS_PART_NAME;
parts[0].offset = rootfs_offset;
parts[0].size = mtd->size - rootfs_offset;
*pparts = parts;
return NR_PARTS;
}
static const struct of_device_id mtdsplit_cfe_bootfs_of_match_table[] = {
{ .compatible = "brcm,bcm4908-firmware" },
{},
};
MODULE_DEVICE_TABLE(of, mtdsplit_cfe_bootfs_of_match_table);
static struct mtd_part_parser mtdsplit_cfe_bootfs_parser = {
.owner = THIS_MODULE,
.name = "cfe-bootfs",
.of_match_table = mtdsplit_cfe_bootfs_of_match_table,
.parse_fn = mtdsplit_cfe_bootfs_parse,
};
module_mtd_part_parser(mtdsplit_cfe_bootfs_parser);
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