4 * Parse MyLoader-style flash partition tables and produce a Linux partition
7 * Copyright (C) 2007 OpenWrt.org
8 * Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
10 * This file was based on drivers/mtd/redboot.c
11 * Author: Red Hat, Inc. - David Woodhouse <dwmw2@cambridge.redhat.com>
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version 2
16 * of the License, or (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the
25 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
26 * Boston, MA 02110-1301, USA.
29 #include <linux/kernel.h>
30 #include <linux/slab.h>
31 #include <linux/init.h>
32 #include <linux/vmalloc.h>
34 #include <linux/mtd/mtd.h>
35 #include <linux/mtd/partitions.h>
37 #include <linux/byteorder/generic.h>
39 #include <prom/myloader.h>
41 #define NAME_LEN_MAX 20
42 #define NAME_MYLOADER "MyLoader"
43 #define NAME_PARTITION_TABLE "Partition Table"
44 #define BLOCK_LEN_MIN 0x10000
46 int parse_myloader_partitions(struct mtd_info *master,
47 struct mtd_partition **pparts,
50 struct mylo_partition_table *tab;
51 struct mylo_partition *part;
52 struct mtd_partition *mtd_parts;
53 struct mtd_partition *mtd_part;
60 unsigned long blocklen;
62 tab = vmalloc(sizeof(*tab));
68 blocklen = master->erasesize;
69 if (blocklen < BLOCK_LEN_MIN)
70 blocklen = BLOCK_LEN_MIN;
72 /* Partition Table is always located on the second erase block */
74 printk(KERN_NOTICE "%s: searching for MyLoader partition table at "
75 "offset 0x%lx\n", master->name, offset);
77 ret = master->read(master, offset, sizeof(*tab), &retlen, (void *)tab);
81 if (retlen != sizeof(*tab)) {
86 /* Check for Partition Table magic number */
87 if (tab->magic != le32_to_cpu(MYLO_MAGIC_PARTITIONS)) {
88 printk(KERN_NOTICE "%s: no MyLoader partition table found\n",
94 /* The MyLoader and the Partition Table is always present */
97 /* Detect number of used partitions */
98 for (i = 0; i < MYLO_MAX_PARTITIONS; i++) {
99 part = &tab->partitions[i];
101 if (le16_to_cpu(part->type) == PARTITION_TYPE_FREE)
107 mtd_parts = kzalloc((num_parts*sizeof(*mtd_part) + num_parts*NAME_LEN_MAX),
115 mtd_part = mtd_parts;
116 names = (char *)&mtd_parts[num_parts];
118 strncpy(names, NAME_MYLOADER, NAME_LEN_MAX-1);
119 mtd_part->name = names;
120 mtd_part->offset = 0;
121 mtd_part->size = blocklen;
122 mtd_part->mask_flags = MTD_WRITEABLE;
124 names += NAME_LEN_MAX;
126 strncpy(names, NAME_PARTITION_TABLE, NAME_LEN_MAX-1);
127 mtd_part->name = names;
128 mtd_part->offset = blocklen;
129 mtd_part->size = blocklen;
130 mtd_part->mask_flags = MTD_WRITEABLE;
132 names += NAME_LEN_MAX;
134 for (i = 0; i < MYLO_MAX_PARTITIONS; i++) {
135 part = &tab->partitions[i];
137 if (le16_to_cpu(part->type) == PARTITION_TYPE_FREE)
140 sprintf(names, "partition%d", i);
141 mtd_part->offset = le32_to_cpu(part->addr);
142 mtd_part->size = le32_to_cpu(part->size);
143 mtd_part->name = names;
145 names += NAME_LEN_MAX;
157 static struct mtd_part_parser mylo_mtd_parser = {
158 .owner = THIS_MODULE,
159 .parse_fn = parse_myloader_partitions,
160 .name = NAME_MYLOADER,
163 static int __init mylo_mtd_parser_init(void)
165 return register_mtd_parser(&mylo_mtd_parser);
168 static void __exit mylo_mtd_parser_exit(void)
170 deregister_mtd_parser(&mylo_mtd_parser);
173 module_init(mylo_mtd_parser_init);
174 module_exit(mylo_mtd_parser_exit);
176 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
177 MODULE_DESCRIPTION("Parsing code for MyLoader partition tables");
178 MODULE_LICENSE("GPL");