2 * Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org>
3 * Copyright (C) 2014 Felix Fietkau <nbd@nbd.name>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published
7 * by the Free Software Foundation.
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/mtd/mtd.h>
16 #include <linux/mtd/partitions.h>
17 #include <linux/byteorder/generic.h>
21 #define TPLINK_NR_PARTS 2
22 #define TPLINK_MIN_ROOTFS_OFFS 0x80000 /* 512KiB */
29 uint32_t hw_id; /* hardware id */
30 uint32_t hw_rev; /* hardware revision */
32 uint8_t md5sum1[MD5SUM_LEN];
34 uint8_t md5sum2[MD5SUM_LEN];
36 uint32_t kernel_la; /* kernel load address */
37 uint32_t kernel_ep; /* kernel entry point */
38 uint32_t fw_length; /* total length of the firmware */
39 uint32_t kernel_ofs; /* kernel data offset */
40 uint32_t kernel_len; /* kernel data length */
41 uint32_t rootfs_ofs; /* rootfs data offset */
42 uint32_t rootfs_len; /* rootfs data length */
43 uint32_t boot_ofs; /* bootloader data offset */
44 uint32_t boot_len; /* bootloader data length */
46 } __attribute__ ((packed));
49 char fw_version[48]; /* 0x04: fw version string */
50 uint32_t hw_id; /* 0x34: hardware id */
51 uint32_t hw_rev; /* 0x38: FIXME: hardware revision? */
52 uint32_t unk1; /* 0x3c: 0x00000000 */
53 uint8_t md5sum1[MD5SUM_LEN]; /* 0x40 */
54 uint32_t unk2; /* 0x50: 0x00000000 */
55 uint8_t md5sum2[MD5SUM_LEN]; /* 0x54 */
56 uint32_t unk3; /* 0x64: 0xffffffff */
58 uint32_t kernel_la; /* 0x68: kernel load address */
59 uint32_t kernel_ep; /* 0x6c: kernel entry point */
60 uint32_t fw_length; /* 0x70: total length of the image */
61 uint32_t kernel_ofs; /* 0x74: kernel data offset */
62 uint32_t kernel_len; /* 0x78: kernel data length */
63 uint32_t rootfs_ofs; /* 0x7c: rootfs data offset */
64 uint32_t rootfs_len; /* 0x80: rootfs data length */
65 uint32_t boot_ofs; /* 0x84: FIXME: seems to be unused */
66 uint32_t boot_len; /* 0x88: FIXME: seems to be unused */
67 uint16_t unk4; /* 0x8c: 0x55aa */
68 uint8_t sver_hi; /* 0x8e */
69 uint8_t sver_lo; /* 0x8f */
70 uint8_t unk5; /* 0x90: magic: 0xa5 */
71 uint8_t ver_hi; /* 0x91 */
72 uint8_t ver_mid; /* 0x92 */
73 uint8_t ver_lo; /* 0x93 */
75 } __attribute__ ((packed));
77 struct tplink_fw_header {
85 static int mtdsplit_parse_tplink(struct mtd_info *master,
86 struct mtd_partition **pparts,
87 struct mtd_part_parser_data *data)
89 struct tplink_fw_header hdr;
90 size_t hdr_len, retlen, kernel_size;
92 struct mtd_partition *parts;
95 hdr_len = sizeof(hdr);
96 err = mtd_read(master, 0, hdr_len, &retlen, (void *) &hdr);
100 if (retlen != hdr_len)
103 switch (le32_to_cpu(hdr.version)) {
105 if (be32_to_cpu(hdr.v1.kernel_ofs) != sizeof(hdr))
108 kernel_size = sizeof(hdr) + be32_to_cpu(hdr.v1.kernel_len);
112 if (be32_to_cpu(hdr.v2.kernel_ofs) != sizeof(hdr))
115 kernel_size = sizeof(hdr) + be32_to_cpu(hdr.v2.kernel_len);
121 if (kernel_size > master->size)
124 /* Find the rootfs after the kernel. */
125 err = mtd_check_rootfs_magic(master, kernel_size, NULL);
127 rootfs_offset = kernel_size;
130 * The size in the header might cover the rootfs as well.
131 * Start the search from an arbitrary offset.
133 err = mtd_find_rootfs_from(master, TPLINK_MIN_ROOTFS_OFFS,
134 master->size, &rootfs_offset, NULL);
139 parts = kzalloc(TPLINK_NR_PARTS * sizeof(*parts), GFP_KERNEL);
143 parts[0].name = KERNEL_PART_NAME;
145 parts[0].size = rootfs_offset;
147 parts[1].name = ROOTFS_PART_NAME;
148 parts[1].offset = rootfs_offset;
149 parts[1].size = master->size - rootfs_offset;
152 return TPLINK_NR_PARTS;
155 static struct mtd_part_parser mtdsplit_tplink_parser = {
156 .owner = THIS_MODULE,
158 .parse_fn = mtdsplit_parse_tplink,
159 .type = MTD_PARSER_TYPE_FIRMWARE,
162 static int __init mtdsplit_tplink_init(void)
164 register_mtd_parser(&mtdsplit_tplink_parser);
169 subsys_initcall(mtdsplit_tplink_init);