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author | Gabor Juhos <juhosg@openwrt.org> | 2013-09-21 17:56:18 +0000 |
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committer | Gabor Juhos <juhosg@openwrt.org> | 2013-09-21 17:56:18 +0000 |
commit | 2e62ff9320035e47a945cac48b16a4428844e5d7 (patch) | |
tree | ac76dc579b8e4de976d8d2b7bcce038619ff4e57 /target/linux/generic/files | |
parent | 2f2ed5c5c161d77ae94f70c07caaeb1edbb419df (diff) | |
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kernel/3.10: add partition parser for Seama firmwares
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
SVN-Revision: 38114
Diffstat (limited to 'target/linux/generic/files')
-rw-r--r-- | target/linux/generic/files/drivers/mtd/mtdsplit_seama.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/target/linux/generic/files/drivers/mtd/mtdsplit_seama.c b/target/linux/generic/files/drivers/mtd/mtdsplit_seama.c new file mode 100644 index 0000000..7a2dc7d --- /dev/null +++ b/target/linux/generic/files/drivers/mtd/mtdsplit_seama.c @@ -0,0 +1,102 @@ +/* + * Copyright (C) 2013 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/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 SEAMA_MAGIC 0x5EA3A417 +#define SEAMA_NR_PARTS 2 +#define SEAMA_MIN_ROOTFS_OFFS 0x80000 /* 512KiB */ + +struct seama_header { + __be32 magic; /* should always be SEAMA_MAGIC. */ + __be16 reserved; /* reserved for */ + __be16 metasize; /* size of the META data */ + __be32 size; /* size of the image */ +}; + +static int mtdsplit_parse_seama(struct mtd_info *master, + struct mtd_partition **pparts, + struct mtd_part_parser_data *data) +{ + struct seama_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; + + /* sanity checks */ + if (be32_to_cpu(hdr.magic) != SEAMA_MAGIC) + return -EINVAL; + + kernel_size = hdr_len + be32_to_cpu(hdr.size) + + be16_to_cpu(hdr.metasize); + 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, SEAMA_MIN_ROOTFS_OFFS, + master->size, &rootfs_offset); + if (err) + return err; + } + + parts = kzalloc(SEAMA_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 SEAMA_NR_PARTS; +} + +static struct mtd_part_parser mtdsplit_seama_parser = { + .owner = THIS_MODULE, + .name = "seama-fw", + .parse_fn = mtdsplit_parse_seama, + .type = MTD_PARSER_TYPE_FIRMWARE, +}; + +static int +mtdsplit_seama_init(void) +{ + return register_mtd_parser(&mtdsplit_seama_parser); +} + +subsys_initcall(mtdsplit_seama_init); |