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 modify it
14 * under the terms of the GNU General Public License version 2 as published
15 * by the Free Software Foundation.
19 #include <linux/kernel.h>
20 #include <linux/slab.h>
21 #include <linux/init.h>
22 #include <linux/vmalloc.h>
24 #include <linux/mtd/mtd.h>
25 #include <linux/mtd/partitions.h>
27 #include <linux/byteorder/generic.h>
29 #include <prom/myloader.h>
31 #define NAME_LEN_MAX 20
32 #define NAME_MYLOADER "MyLoader"
33 #define NAME_PARTITION_TABLE "Partition Table"
34 #define BLOCK_LEN_MIN 0x10000
36 int parse_myloader_partitions(struct mtd_info *master,
37 struct mtd_partition **pparts,
40 struct mylo_partition_table *tab;
41 struct mylo_partition *part;
42 struct mtd_partition *mtd_parts;
43 struct mtd_partition *mtd_part;
49 unsigned long blocklen;
51 tab = vmalloc(sizeof(*tab));
57 blocklen = master->erasesize;
58 if (blocklen < BLOCK_LEN_MIN)
59 blocklen = BLOCK_LEN_MIN;
61 /* Partition Table is always located on the second erase block */
63 printk(KERN_NOTICE "%s: searching for MyLoader partition table at "
64 "offset 0x%lx\n", master->name, offset);
66 ret = master->read(master, offset, sizeof(*tab), &retlen, (void *)tab);
70 if (retlen != sizeof(*tab)) {
75 /* Check for Partition Table magic number */
76 if (tab->magic != le32_to_cpu(MYLO_MAGIC_PARTITIONS)) {
77 printk(KERN_NOTICE "%s: no MyLoader partition table found\n",
83 /* The MyLoader and the Partition Table is always present */
86 /* Detect number of used partitions */
87 for (i = 0; i < MYLO_MAX_PARTITIONS; i++) {
88 part = &tab->partitions[i];
90 if (le16_to_cpu(part->type) == PARTITION_TYPE_FREE)
96 mtd_parts = kzalloc((num_parts * sizeof(*mtd_part) +
97 num_parts * NAME_LEN_MAX), GFP_KERNEL);
104 mtd_part = mtd_parts;
105 names = (char *)&mtd_parts[num_parts];
107 strncpy(names, NAME_MYLOADER, NAME_LEN_MAX-1);
108 mtd_part->name = names;
109 mtd_part->offset = 0;
110 mtd_part->size = blocklen;
111 mtd_part->mask_flags = MTD_WRITEABLE;
113 names += NAME_LEN_MAX;
115 strncpy(names, NAME_PARTITION_TABLE, NAME_LEN_MAX-1);
116 mtd_part->name = names;
117 mtd_part->offset = blocklen;
118 mtd_part->size = blocklen;
119 mtd_part->mask_flags = MTD_WRITEABLE;
121 names += NAME_LEN_MAX;
123 for (i = 0; i < MYLO_MAX_PARTITIONS; i++) {
124 part = &tab->partitions[i];
126 if (le16_to_cpu(part->type) == PARTITION_TYPE_FREE)
129 sprintf(names, "partition%d", i);
130 mtd_part->offset = le32_to_cpu(part->addr);
131 mtd_part->size = le32_to_cpu(part->size);
132 mtd_part->name = names;
134 names += NAME_LEN_MAX;
146 static struct mtd_part_parser mylo_mtd_parser = {
147 .owner = THIS_MODULE,
148 .parse_fn = parse_myloader_partitions,
149 .name = NAME_MYLOADER,
152 static int __init mylo_mtd_parser_init(void)
154 return register_mtd_parser(&mylo_mtd_parser);
157 static void __exit mylo_mtd_parser_exit(void)
159 deregister_mtd_parser(&mylo_mtd_parser);
162 module_init(mylo_mtd_parser_init);
163 module_exit(mylo_mtd_parser_exit);
165 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
166 MODULE_DESCRIPTION("Parsing code for MyLoader partition tables");
167 MODULE_LICENSE("GPL v2");