mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
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165 lines
3.8 KiB
C
165 lines
3.8 KiB
C
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/*
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* Parse MyLoader-style flash partition tables and produce a Linux partition
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* array to match.
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*
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* Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
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*
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* This file was based on drivers/mtd/redboot.c
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* Author: Red Hat, Inc. - David Woodhouse <dwmw2@cambridge.redhat.com>
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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/kernel.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/vmalloc.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 <prom/myloader.h>
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#define NAME_LEN_MAX 20
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#define NAME_MYLOADER "MyLoader"
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#define NAME_PARTITION_TABLE "Partition Table"
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#define BLOCK_LEN_MIN 0x10000
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int parse_myloader_partitions(struct mtd_info *master,
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struct mtd_partition **pparts,
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unsigned long origin)
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{
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struct mylo_partition_table *tab;
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struct mylo_partition *part;
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struct mtd_partition *mtd_parts;
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struct mtd_partition *mtd_part;
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int num_parts;
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int ret, i;
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size_t retlen;
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char *names;
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unsigned long offset;
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unsigned long blocklen;
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tab = vmalloc(sizeof(*tab));
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if (!tab) {
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return -ENOMEM;
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goto out;
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}
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blocklen = master->erasesize;
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if (blocklen < BLOCK_LEN_MIN)
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blocklen = BLOCK_LEN_MIN;
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/* Partition Table is always located on the second erase block */
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offset = blocklen;
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printk(KERN_NOTICE "%s: searching for MyLoader partition table at "
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"offset 0x%lx\n", master->name, offset);
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ret = master->read(master, offset, sizeof(*tab), &retlen, (void *)tab);
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if (ret)
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goto out;
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if (retlen != sizeof(*tab)) {
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ret = -EIO;
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goto out_free_buf;
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}
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/* Check for Partition Table magic number */
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if (tab->magic != le32_to_cpu(MYLO_MAGIC_PARTITIONS)) {
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printk(KERN_NOTICE "%s: no MyLoader partition table found\n",
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master->name);
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ret = 0;
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goto out_free_buf;
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}
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/* The MyLoader and the Partition Table is always present */
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num_parts = 2;
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/* Detect number of used partitions */
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for (i = 0; i < MYLO_MAX_PARTITIONS; i++) {
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part = &tab->partitions[i];
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if (le16_to_cpu(part->type) == PARTITION_TYPE_FREE)
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continue;
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num_parts++;
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}
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mtd_parts = kzalloc((num_parts * sizeof(*mtd_part) +
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num_parts * NAME_LEN_MAX), GFP_KERNEL);
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if (!mtd_parts) {
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ret = -ENOMEM;
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goto out_free_buf;
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}
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mtd_part = mtd_parts;
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names = (char *)&mtd_parts[num_parts];
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strncpy(names, NAME_MYLOADER, NAME_LEN_MAX-1);
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mtd_part->name = names;
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mtd_part->offset = 0;
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mtd_part->size = blocklen;
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mtd_part->mask_flags = MTD_WRITEABLE;
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mtd_part++;
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names += NAME_LEN_MAX;
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strncpy(names, NAME_PARTITION_TABLE, NAME_LEN_MAX-1);
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mtd_part->name = names;
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mtd_part->offset = blocklen;
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mtd_part->size = blocklen;
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mtd_part->mask_flags = MTD_WRITEABLE;
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mtd_part++;
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names += NAME_LEN_MAX;
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for (i = 0; i < MYLO_MAX_PARTITIONS; i++) {
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part = &tab->partitions[i];
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if (le16_to_cpu(part->type) == PARTITION_TYPE_FREE)
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continue;
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sprintf(names, "partition%d", i);
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mtd_part->offset = le32_to_cpu(part->addr);
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mtd_part->size = le32_to_cpu(part->size);
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mtd_part->name = names;
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mtd_part++;
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names += NAME_LEN_MAX;
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}
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*pparts = mtd_parts;
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ret = num_parts;
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out_free_buf:
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vfree(tab);
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out:
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return ret;
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}
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static struct mtd_part_parser mylo_mtd_parser = {
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.owner = THIS_MODULE,
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.parse_fn = parse_myloader_partitions,
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.name = NAME_MYLOADER,
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};
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static int __init mylo_mtd_parser_init(void)
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{
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return register_mtd_parser(&mylo_mtd_parser);
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}
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static void __exit mylo_mtd_parser_exit(void)
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{
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deregister_mtd_parser(&mylo_mtd_parser);
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}
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module_init(mylo_mtd_parser_init);
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module_exit(mylo_mtd_parser_exit);
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MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
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MODULE_DESCRIPTION("Parsing code for MyLoader partition tables");
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MODULE_LICENSE("GPL v2");
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