kernel: add a mtdsplit implementation for tp-link firmware headers

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 43806

3 files changed, 175 insertions, 0 deletions

diff --git a/target/linux/generic/files/drivers/mtd/mtdsplit/Kconfig b/target/linux/generic/files/drivers/mtd/mtdsplit/Kconfig
index 9a32daa..94775ea 100644
--- a/target/linux/generic/files/drivers/mtd/mtdsplit/Kconfig
+++ b/target/linux/generic/files/drivers/mtd/mtdsplit/Kconfig
@@ -34,3 +34,8 @@ config MTD_SPLIT_LZMA_FW
 	bool "LZMA compressed kernel based firmware partition parser"
 	depends on MTD_SPLIT_SUPPORT
 	select MTD_SPLIT
+
+config MTD_SPLIT_TPLINK_FW
+	bool "TP-Link firmware parser"
+	depends on MTD_SPLIT_SUPPORT
+	select MTD_SPLIT
diff --git a/target/linux/generic/files/drivers/mtd/mtdsplit/Makefile b/target/linux/generic/files/drivers/mtd/mtdsplit/Makefile
index 41bc1de..bcb250b 100644
--- a/target/linux/generic/files/drivers/mtd/mtdsplit/Makefile
+++ b/target/linux/generic/files/drivers/mtd/mtdsplit/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_MTD_SPLIT_SEAMA_FW) += mtdsplit_seama.o
 obj-$(CONFIG_MTD_SPLIT_SQUASHFS_ROOT) += mtdsplit_squashfs.o
 obj-$(CONFIG_MTD_SPLIT_UIMAGE_FW) += mtdsplit_uimage.o
 obj-$(CONFIG_MTD_SPLIT_LZMA_FW) += mtdsplit_lzma.o
+obj-$(CONFIG_MTD_SPLIT_TPLINK_FW) += mtdsplit_tplink.o
diff --git a/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_tplink.c b/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_tplink.c
new file mode 100644
index 0000000..00c2d39
--- /dev/null
+++ b/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_tplink.c
@@ -0,0 +1,169 @@
+/*
+ *  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);