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- /*
- * Copyright (c) 2015 The Linux Foundation
- * Copyright (C) 2014 Gabor Juhos <juhosg@openwrt.org>
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
- #include <linux/module.h>
- #include <linux/mtd/mtd.h>
- #include <linux/mtd/partitions.h>
- #include <linux/types.h>
- #include <linux/byteorder/generic.h>
- #include <linux/slab.h>
- #include <linux/of_fdt.h>
- #include "mtdsplit.h"
- struct fdt_header {
- uint32_t magic; /* magic word FDT_MAGIC */
- uint32_t totalsize; /* total size of DT block */
- uint32_t off_dt_struct; /* offset to structure */
- uint32_t off_dt_strings; /* offset to strings */
- uint32_t off_mem_rsvmap; /* offset to memory reserve map */
- uint32_t version; /* format version */
- uint32_t last_comp_version; /* last compatible version */
- /* version 2 fields below */
- uint32_t boot_cpuid_phys; /* Which physical CPU id we're
- booting on */
- /* version 3 fields below */
- uint32_t size_dt_strings; /* size of the strings block */
- /* version 17 fields below */
- uint32_t size_dt_struct; /* size of the structure block */
- };
- static int
- mtdsplit_fit_parse(struct mtd_info *mtd, struct mtd_partition **pparts,
- struct mtd_part_parser_data *data)
- {
- struct fdt_header hdr;
- size_t hdr_len, retlen;
- size_t offset;
- size_t fit_offset, fit_size;
- size_t rootfs_offset, rootfs_size;
- struct mtd_partition *parts;
- int ret;
- hdr_len = sizeof(struct fdt_header);
- /* Parse the MTD device & search for the FIT image location */
- for(offset = 0; offset < mtd->size; offset += mtd->erasesize) {
- ret = mtd_read(mtd, 0, hdr_len, &retlen, (void*) &hdr);
- if (ret) {
- pr_err("read error in \"%s\" at offset 0x%llx\n",
- mtd->name, (unsigned long long) offset);
- return ret;
- }
- if (retlen != hdr_len) {
- pr_err("short read in \"%s\"\n", mtd->name);
- return -EIO;
- }
- /* Check the magic - see if this is a FIT image */
- if (be32_to_cpu(hdr.magic) != OF_DT_HEADER) {
- pr_debug("no valid FIT image found in \"%s\" at offset %llx\n",
- mtd->name, (unsigned long long) offset);
- continue;
- }
- /* We found a FIT image. Let's keep going */
- break;
- }
- fit_offset = offset;
- fit_size = be32_to_cpu(hdr.totalsize);
- if (fit_size == 0) {
- pr_err("FIT image in \"%s\" at offset %llx has null size\n",
- mtd->name, (unsigned long long) fit_offset);
- return -ENODEV;
- }
- /* Search for the rootfs partition after the FIT image */
- ret = mtd_find_rootfs_from(mtd, fit_offset + fit_size, mtd->size,
- &rootfs_offset, NULL);
- if (ret) {
- pr_info("no rootfs found after FIT image in \"%s\"\n",
- mtd->name);
- return ret;
- }
- rootfs_size = mtd->size - rootfs_offset;
- parts = kzalloc(2 * sizeof(*parts), GFP_KERNEL);
- if (!parts)
- return -ENOMEM;
- parts[0].name = KERNEL_PART_NAME;
- parts[0].offset = fit_offset;
- parts[0].size = mtd_rounddown_to_eb(fit_size, mtd) + mtd->erasesize;
- parts[1].name = ROOTFS_PART_NAME;
- parts[1].offset = rootfs_offset;
- parts[1].size = rootfs_size;
- *pparts = parts;
- return 2;
- }
- static struct mtd_part_parser uimage_parser = {
- .owner = THIS_MODULE,
- .name = "fit-fw",
- .parse_fn = mtdsplit_fit_parse,
- .type = MTD_PARSER_TYPE_FIRMWARE,
- };
- /**************************************************
- * Init
- **************************************************/
- static int __init mtdsplit_fit_init(void)
- {
- register_mtd_parser(&uimage_parser);
- return 0;
- }
- module_init(mtdsplit_fit_init);
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