Signed-off-by: Gabor Juhos <juhosg@openwrt.org> SVN-Revision: 38114master
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/*
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* Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org> |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 as published |
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* by the Free Software Foundation. |
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* |
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*/ |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/mtd/mtd.h> |
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#include <linux/mtd/partitions.h> |
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#include <linux/byteorder/generic.h> |
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#include "mtdsplit.h" |
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#define SEAMA_MAGIC 0x5EA3A417 |
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#define SEAMA_NR_PARTS 2 |
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#define SEAMA_MIN_ROOTFS_OFFS 0x80000 /* 512KiB */ |
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struct seama_header { |
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__be32 magic; /* should always be SEAMA_MAGIC. */ |
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__be16 reserved; /* reserved for */ |
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__be16 metasize; /* size of the META data */ |
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__be32 size; /* size of the image */ |
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}; |
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static int mtdsplit_parse_seama(struct mtd_info *master, |
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struct mtd_partition **pparts, |
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struct mtd_part_parser_data *data) |
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{ |
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struct seama_header hdr; |
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size_t hdr_len, retlen, kernel_size; |
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size_t rootfs_offset; |
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struct mtd_partition *parts; |
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int err; |
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hdr_len = sizeof(hdr); |
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err = mtd_read(master, 0, hdr_len, &retlen, (void *) &hdr); |
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if (err) |
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return err; |
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if (retlen != hdr_len) |
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return -EIO; |
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/* sanity checks */ |
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if (be32_to_cpu(hdr.magic) != SEAMA_MAGIC) |
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return -EINVAL; |
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kernel_size = hdr_len + be32_to_cpu(hdr.size) + |
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be16_to_cpu(hdr.metasize); |
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if (kernel_size > master->size) |
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return -EINVAL; |
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/* Find the rootfs after the kernel. */ |
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err = mtd_check_rootfs_magic(master, kernel_size); |
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if (!err) { |
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rootfs_offset = kernel_size; |
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} else { |
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/*
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* The size in the header might cover the rootfs as well. |
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* Start the search from an arbitrary offset. |
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*/ |
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err = mtd_find_rootfs_from(master, SEAMA_MIN_ROOTFS_OFFS, |
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master->size, &rootfs_offset); |
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if (err) |
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return err; |
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} |
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parts = kzalloc(SEAMA_NR_PARTS * sizeof(*parts), GFP_KERNEL); |
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if (!parts) |
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return -ENOMEM; |
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parts[0].name = KERNEL_PART_NAME; |
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parts[0].offset = 0; |
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parts[0].size = rootfs_offset; |
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parts[1].name = ROOTFS_PART_NAME; |
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parts[1].offset = rootfs_offset; |
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parts[1].size = master->size - rootfs_offset; |
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*pparts = parts; |
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return SEAMA_NR_PARTS; |
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} |
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static struct mtd_part_parser mtdsplit_seama_parser = { |
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.owner = THIS_MODULE, |
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.name = "seama-fw", |
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.parse_fn = mtdsplit_parse_seama, |
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.type = MTD_PARSER_TYPE_FIRMWARE, |
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}; |
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static int |
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mtdsplit_seama_init(void) |
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{ |
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return register_mtd_parser(&mtdsplit_seama_parser); |
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} |
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subsys_initcall(mtdsplit_seama_init); |
@ -0,0 +1,23 @@ |
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--- a/drivers/mtd/Kconfig
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+++ b/drivers/mtd/Kconfig
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@@ -50,6 +50,10 @@ config MTD_SPLIT_SQUASHFS_ROOT
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comment "Firmware partition parsers"
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+config MTD_SPLIT_SEAMA_FW
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+ bool "Seama firmware parser"
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+ select MTD_SPLIT
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+
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config MTD_SPLIT_UIMAGE_FW
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bool "uImage based firmware partition parser"
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select MTD_SPLIT
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--- a/drivers/mtd/Makefile
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+++ b/drivers/mtd/Makefile
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@@ -7,6 +7,7 @@ obj-$(CONFIG_MTD) += mtd.o
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mtd-y := mtdcore.o mtdsuper.o mtdconcat.o mtdpart.o mtdchar.o
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mtd-$(CONFIG_MTD_SPLIT) += mtdsplit.o
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+mtd-$(CONFIG_MTD_SPLIT_SEAMA_FW) += mtdsplit_seama.o
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mtd-$(CONFIG_MTD_SPLIT_SQUASHFS_ROOT) += mtdsplit_squashfs.o
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mtd-$(CONFIG_MTD_SPLIT_UIMAGE_FW) += mtdsplit_uimage.o
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