mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
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c5552ad039
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@21952 3c298f89-4303-0410-b956-a3cf2f4a3e73
179 lines
4.1 KiB
C
179 lines
4.1 KiB
C
/*
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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) 2007-2009 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 <linux/myloader.h>
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#define BLOCK_LEN_MIN 0x10000
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#define PART_NAME_LEN 32
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struct part_data {
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struct mylo_partition_table tab;
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char names[MYLO_MAX_PARTITIONS][PART_NAME_LEN];
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};
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int myloader_parse_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 part_data *buf;
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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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buf = vmalloc(sizeof(*buf));
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if (!buf) {
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return -ENOMEM;
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goto out;
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}
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tab = &buf->tab;
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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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offset = blocklen;
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/* Find the partition table */
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for (i = 0; i < 4; i++, offset += blocklen) {
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printk(KERN_DEBUG "%s: searching for MyLoader partition table"
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" at offset 0x%lx\n", master->name, offset);
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ret = master->read(master, offset, sizeof(*buf), &retlen,
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(void *)buf);
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if (ret)
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goto out_free_buf;
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if (retlen != sizeof(*buf)) {
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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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break;
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}
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if (tab->magic != le32_to_cpu(MYLO_MAGIC_PARTITIONS)) {
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printk(KERN_DEBUG "%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 * PART_NAME_LEN), 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, "myloader", PART_NAME_LEN);
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mtd_part->name = names;
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mtd_part->offset = 0;
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mtd_part->size = offset;
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mtd_part->mask_flags = MTD_WRITEABLE;
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mtd_part++;
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names += PART_NAME_LEN;
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strncpy(names, "partition_table", PART_NAME_LEN);
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mtd_part->name = names;
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mtd_part->offset = offset;
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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 += PART_NAME_LEN;
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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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if ((buf->names[i][0]) && (buf->names[i][0] != '\xff'))
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strncpy(names, buf->names[i], PART_NAME_LEN);
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else
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snprintf(names, PART_NAME_LEN, "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 += PART_NAME_LEN;
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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(buf);
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out:
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return ret;
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}
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static struct mtd_part_parser myloader_mtd_parser = {
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.owner = THIS_MODULE,
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.parse_fn = myloader_parse_partitions,
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.name = "MyLoader",
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};
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static int __init myloader_mtd_parser_init(void)
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{
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return register_mtd_parser(&myloader_mtd_parser);
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}
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static void __exit myloader_mtd_parser_exit(void)
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{
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deregister_mtd_parser(&myloader_mtd_parser);
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}
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module_init(myloader_mtd_parser_init);
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module_exit(myloader_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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