at91: bump to v3.18
[openwrt/svn-archive/archive.git] / target / linux / at91 / files / drivers / mtd / at91part.c
1 /*
2 *
3 * Copyright (C) 2007 OpenWrt.org
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Atmel AT91 flash partition table. (Modified by Hamish Guthrie).
20 * Based on ar7 map by Felix Fietkau.
21 *
22 */
23
24 #include <linux/kernel.h>
25 #include <linux/slab.h>
26
27 #include <linux/mtd/mtd.h>
28 #include <linux/mtd/partitions.h>
29 #include <linux/bootmem.h>
30 #include <linux/squashfs_fs.h>
31
32 static struct mtd_partition at91_parts[6];
33
34 static int create_mtd_partitions(struct mtd_info *master,
35 struct mtd_partition **pparts,
36 unsigned long origin)
37 {
38 unsigned int offset, len;
39 unsigned int pre_size = 0x42000, root_max = 0x362400;
40 unsigned char buf[512];
41 struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
42
43 printk("Parsing AT91 partition map...\n");
44
45 at91_parts[0].name = "loaders";
46 at91_parts[0].offset = 0;
47 at91_parts[0].size = 0x21000;
48 at91_parts[0].mask_flags = MTD_WRITEABLE;
49
50 at91_parts[1].name = "ubparams";
51 at91_parts[1].offset = 0x21000;
52 at91_parts[1].size = 0x8400;
53 at91_parts[1].mask_flags = 0;
54
55 at91_parts[2].name = "kernel";
56 at91_parts[2].offset = pre_size;
57 at91_parts[2].size = 0;
58 at91_parts[2].mask_flags = 0;
59
60 at91_parts[3].name = "rootfs";
61 at91_parts[3].offset = 0;
62 at91_parts[3].size = 0;
63 at91_parts[3].mask_flags = 0;
64
65 for(offset = pre_size; offset < root_max; offset += master->erasesize) {
66
67 memset(&buf, 0xe5, sizeof(buf));
68
69 if (master->read(master, offset, sizeof(buf), &len, buf) || len != sizeof(buf))
70 break;
71
72 if (*((__u32 *) buf) == SQUASHFS_MAGIC) {
73 printk(KERN_INFO "%s: Filesystem type: squashfs, size=0x%x\n",
74 master->name, (u32) sb->bytes_used);
75
76 at91_parts[3].size = sb->bytes_used;
77 at91_parts[3].offset = offset;
78 len = at91_parts[3].offset + at91_parts[3].size;
79 len = ((len / (master->erasesize * 8)) + 1) * master->erasesize * 8;
80 at91_parts[3].size = len - at91_parts[3].offset;
81 at91_parts[2].size = offset - at91_parts[2].offset;
82 break;
83 }
84 }
85
86 if (at91_parts[3].size == 0) {
87 printk(KERN_NOTICE "%s: Couldn't find root filesystem\n", master->name);
88 return -1;
89 }
90
91 at91_parts[4].name = "rootfs_data";
92 at91_parts[4].offset = root_max;
93 at91_parts[4].size = master->size - root_max;
94 at91_parts[4].mask_flags = 0;
95
96 at91_parts[5].name = "complete";
97 at91_parts[5].offset = 0;
98 at91_parts[5].size = master->size;
99 at91_parts[5].mask_flags = 0;
100
101 *pparts = at91_parts;
102 return 6;
103 }
104
105 static struct mtd_part_parser at91_parser = {
106 .owner = THIS_MODULE,
107 .parse_fn = create_mtd_partitions,
108 .name = "at91part",
109 };
110
111 static int __init at91_parser_init(void)
112 {
113 register_mtd_parser(&at91_parser);
114
115 return 0;
116 }
117
118 module_init(at91_parser_init);
119
120 MODULE_LICENSE("GPL");
121 MODULE_AUTHOR("Felix Fietkau, Eugene Konev, Hamish Guthrie");
122 MODULE_DESCRIPTION("MTD partitioning for Atmel at91");