--- /dev/null
+/*
+ * Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org>
+ * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/byteorder/generic.h>
+
+#include "mtdsplit.h"
+
+#define TPLINK_NR_PARTS 2
+#define TPLINK_MIN_ROOTFS_OFFS 0x80000 /* 512KiB */
+
+#define MD5SUM_LEN 16
+
+struct fw_v1 {
+ char vendor_name[24];
+ char fw_version[36];
+ uint32_t hw_id; /* hardware id */
+ uint32_t hw_rev; /* hardware revision */
+ uint32_t unk1;
+ uint8_t md5sum1[MD5SUM_LEN];
+ uint32_t unk2;
+ uint8_t md5sum2[MD5SUM_LEN];
+ uint32_t unk3;
+ uint32_t kernel_la; /* kernel load address */
+ uint32_t kernel_ep; /* kernel entry point */
+ uint32_t fw_length; /* total length of the firmware */
+ uint32_t kernel_ofs; /* kernel data offset */
+ uint32_t kernel_len; /* kernel data length */
+ uint32_t rootfs_ofs; /* rootfs data offset */
+ uint32_t rootfs_len; /* rootfs data length */
+ uint32_t boot_ofs; /* bootloader data offset */
+ uint32_t boot_len; /* bootloader data length */
+ uint8_t pad[360];
+} __attribute__ ((packed));
+
+struct fw_v2 {
+ char fw_version[48]; /* 0x04: fw version string */
+ uint32_t hw_id; /* 0x34: hardware id */
+ uint32_t hw_rev; /* 0x38: FIXME: hardware revision? */
+ uint32_t unk1; /* 0x3c: 0x00000000 */
+ uint8_t md5sum1[MD5SUM_LEN]; /* 0x40 */
+ uint32_t unk2; /* 0x50: 0x00000000 */
+ uint8_t md5sum2[MD5SUM_LEN]; /* 0x54 */
+ uint32_t unk3; /* 0x64: 0xffffffff */
+
+ uint32_t kernel_la; /* 0x68: kernel load address */
+ uint32_t kernel_ep; /* 0x6c: kernel entry point */
+ uint32_t fw_length; /* 0x70: total length of the image */
+ uint32_t kernel_ofs; /* 0x74: kernel data offset */
+ uint32_t kernel_len; /* 0x78: kernel data length */
+ uint32_t rootfs_ofs; /* 0x7c: rootfs data offset */
+ uint32_t rootfs_len; /* 0x80: rootfs data length */
+ uint32_t boot_ofs; /* 0x84: FIXME: seems to be unused */
+ uint32_t boot_len; /* 0x88: FIXME: seems to be unused */
+ uint16_t unk4; /* 0x8c: 0x55aa */
+ uint8_t sver_hi; /* 0x8e */
+ uint8_t sver_lo; /* 0x8f */
+ uint8_t unk5; /* 0x90: magic: 0xa5 */
+ uint8_t ver_hi; /* 0x91 */
+ uint8_t ver_mid; /* 0x92 */
+ uint8_t ver_lo; /* 0x93 */
+ uint8_t pad[364];
+} __attribute__ ((packed));
+
+struct tplink_fw_header {
+ uint32_t version;
+ union {
+ struct fw_v1 v1;
+ struct fw_v2 v2;
+ };
+};
+
+static int mtdsplit_parse_tplink(struct mtd_info *master,
+ struct mtd_partition **pparts,
+ struct mtd_part_parser_data *data)
+{
+ struct tplink_fw_header hdr;
+ size_t hdr_len, retlen, kernel_size;
+ size_t rootfs_offset;
+ struct mtd_partition *parts;
+ int err;
+
+ hdr_len = sizeof(hdr);
+ err = mtd_read(master, 0, hdr_len, &retlen, (void *) &hdr);
+ if (err)
+ return err;
+
+ if (retlen != hdr_len)
+ return -EIO;
+
+ switch (le32_to_cpu(hdr.version)) {
+ case 1:
+ if (be32_to_cpu(hdr.v1.kernel_ofs) != sizeof(hdr))
+ return -EINVAL;
+
+ kernel_size = sizeof(hdr) + be32_to_cpu(hdr.v1.kernel_len);
+ break;
+ case 2:
+ case 3:
+ if (be32_to_cpu(hdr.v2.kernel_ofs) != sizeof(hdr))
+ return -EINVAL;
+
+ kernel_size = sizeof(hdr) + be32_to_cpu(hdr.v2.kernel_len);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (kernel_size > master->size)
+ return -EINVAL;
+
+ /* Find the rootfs after the kernel. */
+ err = mtd_check_rootfs_magic(master, kernel_size);
+ if (!err) {
+ rootfs_offset = kernel_size;
+ } else {
+ /*
+ * The size in the header might cover the rootfs as well.
+ * Start the search from an arbitrary offset.
+ */
+ err = mtd_find_rootfs_from(master, TPLINK_MIN_ROOTFS_OFFS,
+ master->size, &rootfs_offset);
+ if (err)
+ return err;
+ }
+
+ parts = kzalloc(TPLINK_NR_PARTS * sizeof(*parts), GFP_KERNEL);
+ if (!parts)
+ return -ENOMEM;
+
+ parts[0].name = KERNEL_PART_NAME;
+ parts[0].offset = 0;
+ parts[0].size = rootfs_offset;
+
+ parts[1].name = ROOTFS_PART_NAME;
+ parts[1].offset = rootfs_offset;
+ parts[1].size = master->size - rootfs_offset;
+
+ *pparts = parts;
+ return TPLINK_NR_PARTS;
+}
+
+static struct mtd_part_parser mtdsplit_tplink_parser = {
+ .owner = THIS_MODULE,
+ .name = "tplink-fw",
+ .parse_fn = mtdsplit_parse_tplink,
+ .type = MTD_PARSER_TYPE_FIRMWARE,
+};
+
+static int __init mtdsplit_tplink_init(void)
+{
+ register_mtd_parser(&mtdsplit_tplink_parser);
+
+ return 0;
+}
+
+subsys_initcall(mtdsplit_tplink_init);
projects / openwrt.git / commitdiff