2 * Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org>
3 * Copyright (C) 2014 Felix Fietkau <nbd@nbd.name>
4 * Copyright (C) 2016 Stijn Tintel <stijn@linux-ipv6.be>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation.
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/kernel.h>
15 #include <linux/slab.h>
16 #include <linux/mtd/mtd.h>
17 #include <linux/mtd/partitions.h>
18 #include <linux/byteorder/generic.h>
22 #define WRGG_NR_PARTS 2
23 #define WRGG_MIN_ROOTFS_OFFS 0x80000 /* 512KiB */
24 #define WRGG03_MAGIC 0x20080321
26 struct wrgg03_header {
39 } __attribute__ ((packed));
42 static int mtdsplit_parse_wrgg(struct mtd_info *master,
43 struct mtd_partition **pparts,
44 struct mtd_part_parser_data *data)
46 struct wrgg03_header hdr;
47 size_t hdr_len, retlen, kernel_ent_size;
49 struct mtd_partition *parts;
50 enum mtdsplit_part_type type;
53 hdr_len = sizeof(hdr);
54 err = mtd_read(master, 0, hdr_len, &retlen, (void *) &hdr);
58 if (retlen != hdr_len)
62 if (le32_to_cpu(hdr.magic1) != WRGG03_MAGIC)
65 kernel_ent_size = hdr_len + be32_to_cpu(hdr.size);
67 if (kernel_ent_size > master->size)
71 * The size in the header covers the rootfs as well.
72 * Start the search from an arbitrary offset.
74 err = mtd_find_rootfs_from(master, WRGG_MIN_ROOTFS_OFFS,
75 master->size, &rootfs_offset, &type);
79 parts = kzalloc(WRGG_NR_PARTS * sizeof(*parts), GFP_KERNEL);
83 parts[0].name = KERNEL_PART_NAME;
85 parts[0].size = rootfs_offset;
87 parts[1].name = ROOTFS_PART_NAME;
88 parts[1].offset = rootfs_offset;
89 parts[1].size = master->size - rootfs_offset;
95 static struct mtd_part_parser mtdsplit_wrgg_parser = {
98 .parse_fn = mtdsplit_parse_wrgg,
99 .type = MTD_PARSER_TYPE_FIRMWARE,
102 static int __init mtdsplit_wrgg_init(void)
104 register_mtd_parser(&mtdsplit_wrgg_parser);
109 subsys_initcall(mtdsplit_wrgg_init);