2 * Parse MyLoader-style flash partition tables and produce a Linux partition
5 * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
7 * This file was based on drivers/mtd/redboot.c
8 * Author: Red Hat, Inc. - David Woodhouse <dwmw2@cambridge.redhat.com>
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License version 2 as published
12 * by the Free Software Foundation.
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/init.h>
19 #include <linux/vmalloc.h>
21 #include <linux/mtd/mtd.h>
22 #include <linux/mtd/partitions.h>
24 #include <linux/byteorder/generic.h>
26 #include <prom/myloader.h>
28 #define NAME_LEN_MAX 20
29 #define NAME_MYLOADER "MyLoader"
30 #define NAME_PARTITION_TABLE "Partition Table"
31 #define BLOCK_LEN_MIN 0x10000
33 int parse_myloader_partitions(struct mtd_info *master,
34 struct mtd_partition **pparts,
37 struct mylo_partition_table *tab;
38 struct mylo_partition *part;
39 struct mtd_partition *mtd_parts;
40 struct mtd_partition *mtd_part;
46 unsigned long blocklen;
48 tab = vmalloc(sizeof(*tab));
54 blocklen = master->erasesize;
55 if (blocklen < BLOCK_LEN_MIN)
56 blocklen = BLOCK_LEN_MIN;
58 /* Partition Table is always located on the second erase block */
60 printk(KERN_NOTICE "%s: searching for MyLoader partition table at "
61 "offset 0x%lx\n", master->name, offset);
63 ret = master->read(master, offset, sizeof(*tab), &retlen, (void *)tab);
67 if (retlen != sizeof(*tab)) {
72 /* Check for Partition Table magic number */
73 if (tab->magic != le32_to_cpu(MYLO_MAGIC_PARTITIONS)) {
74 printk(KERN_NOTICE "%s: no MyLoader partition table found\n",
80 /* The MyLoader and the Partition Table is always present */
83 /* Detect number of used partitions */
84 for (i = 0; i < MYLO_MAX_PARTITIONS; i++) {
85 part = &tab->partitions[i];
87 if (le16_to_cpu(part->type) == PARTITION_TYPE_FREE)
93 mtd_parts = kzalloc((num_parts * sizeof(*mtd_part) +
94 num_parts * NAME_LEN_MAX), GFP_KERNEL);
101 mtd_part = mtd_parts;
102 names = (char *)&mtd_parts[num_parts];
104 strncpy(names, NAME_MYLOADER, NAME_LEN_MAX-1);
105 mtd_part->name = names;
106 mtd_part->offset = 0;
107 mtd_part->size = blocklen;
108 mtd_part->mask_flags = MTD_WRITEABLE;
110 names += NAME_LEN_MAX;
112 strncpy(names, NAME_PARTITION_TABLE, NAME_LEN_MAX-1);
113 mtd_part->name = names;
114 mtd_part->offset = blocklen;
115 mtd_part->size = blocklen;
116 mtd_part->mask_flags = MTD_WRITEABLE;
118 names += NAME_LEN_MAX;
120 for (i = 0; i < MYLO_MAX_PARTITIONS; i++) {
121 part = &tab->partitions[i];
123 if (le16_to_cpu(part->type) == PARTITION_TYPE_FREE)
126 sprintf(names, "partition%d", i);
127 mtd_part->offset = le32_to_cpu(part->addr);
128 mtd_part->size = le32_to_cpu(part->size);
129 mtd_part->name = names;
131 names += NAME_LEN_MAX;
143 static struct mtd_part_parser mylo_mtd_parser = {
144 .owner = THIS_MODULE,
145 .parse_fn = parse_myloader_partitions,
146 .name = NAME_MYLOADER,
149 static int __init mylo_mtd_parser_init(void)
151 return register_mtd_parser(&mylo_mtd_parser);
154 static void __exit mylo_mtd_parser_exit(void)
156 deregister_mtd_parser(&mylo_mtd_parser);
159 module_init(mylo_mtd_parser_init);
160 module_exit(mylo_mtd_parser_exit);
162 MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
163 MODULE_DESCRIPTION("Parsing code for MyLoader partition tables");
164 MODULE_LICENSE("GPL v2");