134 lines
2.9 KiB
C
134 lines
2.9 KiB
C
/*
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* Parser for TRX format partitions
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*
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* Copyright (C) 2012 - 2017 Rafał Miłecki <rafal@milecki.pl>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published 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/slab.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#define TRX_PARSER_MAX_PARTS 4
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/* Magics */
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#define TRX_MAGIC 0x30524448
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#define UBI_EC_MAGIC 0x23494255 /* UBI# */
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struct trx_header {
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uint32_t magic;
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uint32_t length;
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uint32_t crc32;
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uint16_t flags;
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uint16_t version;
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uint32_t offset[3];
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} __packed;
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static const char *parser_trx_data_part_name(struct mtd_info *master,
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size_t offset)
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{
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uint32_t buf;
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size_t bytes_read;
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int err;
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err = mtd_read(master, offset, sizeof(buf), &bytes_read,
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(uint8_t *)&buf);
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if (err && !mtd_is_bitflip(err)) {
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pr_err("mtd_read error while parsing (offset: 0x%zX): %d\n",
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offset, err);
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goto out_default;
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}
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if (buf == UBI_EC_MAGIC)
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return "ubi";
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out_default:
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return "rootfs";
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}
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static int parser_trx_parse(struct mtd_info *mtd,
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const struct mtd_partition **pparts,
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struct mtd_part_parser_data *data)
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{
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struct mtd_partition *parts;
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struct mtd_partition *part;
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struct trx_header trx;
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size_t bytes_read;
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uint8_t curr_part = 0, i = 0;
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int err;
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parts = kcalloc(TRX_PARSER_MAX_PARTS, sizeof(struct mtd_partition),
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GFP_KERNEL);
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if (!parts)
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return -ENOMEM;
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err = mtd_read(mtd, 0, sizeof(trx), &bytes_read, (uint8_t *)&trx);
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if (err) {
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pr_err("MTD reading error: %d\n", err);
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kfree(parts);
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return err;
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}
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if (trx.magic != TRX_MAGIC) {
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kfree(parts);
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return -ENOENT;
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}
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/* We have LZMA loader if there is address in offset[2] */
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if (trx.offset[2]) {
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part = &parts[curr_part++];
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part->name = "loader";
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part->offset = trx.offset[i];
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i++;
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}
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if (trx.offset[i]) {
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part = &parts[curr_part++];
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part->name = "linux";
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part->offset = trx.offset[i];
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i++;
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}
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if (trx.offset[i]) {
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part = &parts[curr_part++];
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part->name = parser_trx_data_part_name(mtd, trx.offset[i]);
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part->offset = trx.offset[i];
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i++;
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}
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/*
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* Assume that every partition ends at the beginning of the one it is
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* followed by.
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*/
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for (i = 0; i < curr_part; i++) {
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u64 next_part_offset = (i < curr_part - 1) ?
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parts[i + 1].offset : mtd->size;
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parts[i].size = next_part_offset - parts[i].offset;
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}
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*pparts = parts;
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return i;
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};
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static const struct of_device_id mtd_parser_trx_of_match_table[] = {
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{ .compatible = "brcm,trx" },
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{},
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};
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MODULE_DEVICE_TABLE(of, mtd_parser_trx_of_match_table);
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static struct mtd_part_parser mtd_parser_trx = {
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.parse_fn = parser_trx_parse,
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.name = "trx",
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.of_match_table = mtd_parser_trx_of_match_table,
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};
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module_mtd_part_parser(mtd_parser_trx);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Parser for TRX format partitions");
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