2 * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 as published
6 * by the Free Software Foundation.
10 #include <linux/kernel.h>
11 #include <linux/slab.h>
12 #include <linux/vmalloc.h>
13 #include <linux/magic.h>
15 #include <linux/mtd/mtd.h>
16 #include <linux/mtd/partitions.h>
18 #define TPLINK_NUM_PARTS 5
19 #define TPLINK_HEADER_V1 0x01000000
22 #define TPLINK_ART_LEN 0x10000
23 #define TPLINK_KERNEL_OFFS 0x20000
25 struct tplink_fw_header {
26 uint32_t version; /* header version */
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));
48 static struct tplink_fw_header *
49 tplink_read_header(struct mtd_info *mtd, size_t offset)
51 struct tplink_fw_header *header;
57 header = vmalloc(sizeof(*header));
61 header_len = sizeof(struct tplink_fw_header);
62 ret = mtd->read(mtd, offset, header_len, &retlen,
63 (unsigned char *) header);
67 if (retlen != header_len)
71 t = be32_to_cpu(header->version);
72 if (t != TPLINK_HEADER_V1)
75 t = be32_to_cpu(header->kernel_ofs);
87 static int tplink_check_squashfs_magic(struct mtd_info *mtd, size_t offset)
93 ret = mtd->read(mtd, offset, sizeof(magic), &retlen,
94 (unsigned char *) &magic);
98 if (retlen != sizeof(magic))
101 if (le32_to_cpu(magic) != SQUASHFS_MAGIC)
107 static int tplink_parse_partitions(struct mtd_info *master,
108 struct mtd_partition **pparts,
109 unsigned long origin)
111 struct mtd_partition *parts;
112 struct tplink_fw_header *header;
116 size_t rootfs_offset;
117 size_t squashfs_offset;
120 nr_parts = TPLINK_NUM_PARTS;
121 parts = kzalloc(nr_parts * sizeof(struct mtd_partition), GFP_KERNEL);
127 offset = TPLINK_KERNEL_OFFS;
129 header = tplink_read_header(master, offset);
131 pr_notice("%s: no TP-Link header found\n", master->name);
136 squashfs_offset = offset + sizeof(struct tplink_fw_header) +
137 be32_to_cpu(header->kernel_len);
139 ret = tplink_check_squashfs_magic(master, squashfs_offset);
141 rootfs_offset = squashfs_offset;
143 rootfs_offset = offset + be32_to_cpu(header->rootfs_ofs);
145 art_offset = master->size - TPLINK_ART_LEN;
147 parts[0].name = "u-boot";
149 parts[0].size = offset;
150 parts[0].mask_flags = MTD_WRITEABLE;
152 parts[1].name = "kernel";
153 parts[1].offset = offset;
154 parts[1].size = rootfs_offset - offset;
156 parts[2].name = "rootfs";
157 parts[2].offset = rootfs_offset;
158 parts[2].size = art_offset - rootfs_offset;
160 parts[3].name = "art";
161 parts[3].offset = art_offset;
162 parts[3].size = TPLINK_ART_LEN;
163 parts[3].mask_flags = MTD_WRITEABLE;
165 parts[4].name = "firmware";
166 parts[4].offset = offset;
167 parts[4].size = art_offset - offset;
181 static struct mtd_part_parser tplink_parser = {
182 .owner = THIS_MODULE,
183 .parse_fn = tplink_parse_partitions,
187 static int __init tplink_parser_init(void)
189 return register_mtd_parser(&tplink_parser);
192 module_init(tplink_parser_init);
194 MODULE_LICENSE("GPL v2");
195 MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");