141 lines
4 KiB
C
141 lines
4 KiB
C
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/*
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* Copyright (c) 2015 The Linux Foundation
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* Copyright (C) 2014 Gabor Juhos <juhosg@openwrt.org>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <linux/module.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/types.h>
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#include <linux/byteorder/generic.h>
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#include <linux/slab.h>
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#include <linux/of_fdt.h>
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#include "mtdsplit.h"
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struct fdt_header {
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uint32_t magic; /* magic word FDT_MAGIC */
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uint32_t totalsize; /* total size of DT block */
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uint32_t off_dt_struct; /* offset to structure */
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uint32_t off_dt_strings; /* offset to strings */
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uint32_t off_mem_rsvmap; /* offset to memory reserve map */
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uint32_t version; /* format version */
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uint32_t last_comp_version; /* last compatible version */
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/* version 2 fields below */
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uint32_t boot_cpuid_phys; /* Which physical CPU id we're
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booting on */
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/* version 3 fields below */
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uint32_t size_dt_strings; /* size of the strings block */
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/* version 17 fields below */
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uint32_t size_dt_struct; /* size of the structure block */
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};
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static int
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mtdsplit_fit_parse(struct mtd_info *mtd, struct mtd_partition **pparts,
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struct mtd_part_parser_data *data)
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{
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struct fdt_header hdr;
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size_t hdr_len, retlen;
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size_t offset;
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size_t fit_offset, fit_size;
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size_t rootfs_offset, rootfs_size;
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struct mtd_partition *parts;
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int ret;
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hdr_len = sizeof(struct fdt_header);
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/* Parse the MTD device & search for the FIT image location */
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for(offset = 0; offset < mtd->size; offset += mtd->erasesize) {
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ret = mtd_read(mtd, 0, hdr_len, &retlen, (void*) &hdr);
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if (ret) {
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pr_err("read error in \"%s\" at offset 0x%llx\n",
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mtd->name, (unsigned long long) offset);
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return ret;
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}
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if (retlen != hdr_len) {
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pr_err("short read in \"%s\"\n", mtd->name);
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return -EIO;
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}
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/* Check the magic - see if this is a FIT image */
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if (be32_to_cpu(hdr.magic) != OF_DT_HEADER) {
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pr_debug("no valid FIT image found in \"%s\" at offset %llx\n",
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mtd->name, (unsigned long long) offset);
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continue;
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}
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/* We found a FIT image. Let's keep going */
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break;
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}
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fit_offset = offset;
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fit_size = be32_to_cpu(hdr.totalsize);
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if (fit_size == 0) {
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pr_err("FIT image in \"%s\" at offset %llx has null size\n",
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mtd->name, (unsigned long long) fit_offset);
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return -ENODEV;
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}
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/* Search for the rootfs partition after the FIT image */
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ret = mtd_find_rootfs_from(mtd, fit_offset + fit_size,
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mtd->size, &rootfs_offset);
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if (ret) {
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pr_info("no rootfs found after FIT image in \"%s\"\n",
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mtd->name);
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return ret;
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}
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rootfs_size = mtd->size - rootfs_offset;
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parts = kzalloc(2 * 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 = fit_offset;
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parts[0].size = mtd_rounddown_to_eb(fit_size, mtd) + mtd->erasesize;
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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 = rootfs_size;
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*pparts = parts;
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return 2;
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}
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static struct mtd_part_parser uimage_parser = {
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.owner = THIS_MODULE,
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.name = "fit-fw",
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.parse_fn = mtdsplit_fit_parse,
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.type = MTD_PARSER_TYPE_FIRMWARE,
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};
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/**************************************************
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* Init
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**************************************************/
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static int __init mtdsplit_fit_init(void)
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{
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register_mtd_parser(&uimage_parser);
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return 0;
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}
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module_init(mtdsplit_fit_init);
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