diff options
Diffstat (limited to 'target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_tplink.c')
| -rw-r--r-- | target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_tplink.c | 169 |
1 files changed, 169 insertions, 0 deletions
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); |