diff options
Diffstat (limited to 'target/linux/ar71xx/files/drivers/mtd/tplinkpart.c')
| -rw-r--r-- | target/linux/ar71xx/files/drivers/mtd/tplinkpart.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/target/linux/ar71xx/files/drivers/mtd/tplinkpart.c b/target/linux/ar71xx/files/drivers/mtd/tplinkpart.c new file mode 100644 index 000000000..674df6602 --- /dev/null +++ b/target/linux/ar71xx/files/drivers/mtd/tplinkpart.c @@ -0,0 +1,197 @@ +/* + * Copyright (C) 2011 Gabor Juhos <juhosg@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/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/vmalloc.h> +#include <linux/magic.h> + +#include <linux/mtd/mtd.h> +#include <linux/mtd/partitions.h> + +#define TPLINK_NUM_PARTS 5 +#define TPLINK_HEADER_V1 0x01000000 +#define MD5SUM_LEN 16 + +#define TPLINK_ART_LEN 0x10000 +#define TPLINK_KERNEL_OFFS 0x20000 + +struct tplink_fw_header { + uint32_t version; /* header version */ + 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)); + +static struct tplink_fw_header * +tplink_read_header(struct mtd_info *mtd, size_t offset) +{ + struct tplink_fw_header *header; + size_t header_len; + size_t retlen; + int ret; + u32 t; + + header = vmalloc(sizeof(*header)); + if (!header) + goto err; + + header_len = sizeof(struct tplink_fw_header); + ret = mtd->read(mtd, offset, header_len, &retlen, + (unsigned char *) header); + if (ret) + goto err_free_header; + + if (retlen != header_len) + goto err_free_header; + + /* sanity checks */ + t = be32_to_cpu(header->version); + if (t != TPLINK_HEADER_V1) + goto err_free_header; + + t = be32_to_cpu(header->kernel_ofs); + if (t != header_len) + goto err_free_header; + + return header; + +err_free_header: + vfree(header); +err: + return NULL; +} + +static int tplink_check_rootfs_magic(struct mtd_info *mtd, size_t offset) +{ + u32 magic; + size_t retlen; + int ret; + + ret = mtd->read(mtd, offset, sizeof(magic), &retlen, + (unsigned char *) &magic); + if (ret) + return ret; + + if (retlen != sizeof(magic)) + return -EIO; + + if (le32_to_cpu(magic) != SQUASHFS_MAGIC && + magic != 0x19852003) + return -EINVAL; + + return 0; +} + +static int tplink_parse_partitions(struct mtd_info *master, + struct mtd_partition **pparts, + struct mtd_part_parser_data *data) +{ + struct mtd_partition *parts; + struct tplink_fw_header *header; + int nr_parts; + size_t offset; + size_t art_offset; + size_t rootfs_offset; + size_t squashfs_offset; + int ret; + + nr_parts = TPLINK_NUM_PARTS; + parts = kzalloc(nr_parts * sizeof(struct mtd_partition), GFP_KERNEL); + if (!parts) { + ret = -ENOMEM; + goto err; + } + + offset = TPLINK_KERNEL_OFFS; + + header = tplink_read_header(master, offset); + if (!header) { + pr_notice("%s: no TP-Link header found\n", master->name); + ret = -ENODEV; + goto err_free_parts; + } + + squashfs_offset = offset + sizeof(struct tplink_fw_header) + + be32_to_cpu(header->kernel_len); + + ret = tplink_check_rootfs_magic(master, squashfs_offset); + if (ret == 0) + rootfs_offset = squashfs_offset; + else + rootfs_offset = offset + be32_to_cpu(header->rootfs_ofs); + + art_offset = master->size - TPLINK_ART_LEN; + + parts[0].name = "u-boot"; + parts[0].offset = 0; + parts[0].size = offset; + parts[0].mask_flags = MTD_WRITEABLE; + + parts[1].name = "kernel"; + parts[1].offset = offset; + parts[1].size = rootfs_offset - offset; + + parts[2].name = "rootfs"; + parts[2].offset = rootfs_offset; + parts[2].size = art_offset - rootfs_offset; + + parts[3].name = "art"; + parts[3].offset = art_offset; + parts[3].size = TPLINK_ART_LEN; + parts[3].mask_flags = MTD_WRITEABLE; + + parts[4].name = "firmware"; + parts[4].offset = offset; + parts[4].size = art_offset - offset; + + vfree(header); + + *pparts = parts; + return nr_parts; + +err_free_parts: + kfree(parts); +err: + *pparts = NULL; + return ret; +} + +static struct mtd_part_parser tplink_parser = { + .owner = THIS_MODULE, + .parse_fn = tplink_parse_partitions, + .name = "tp-link", +}; + +static int __init tplink_parser_init(void) +{ + return register_mtd_parser(&tplink_parser); +} + +module_init(tplink_parser_init); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>"); |