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authorMatteo Croce <technoboy85@gmail.com>2008-03-11 21:25:06 -0400
committerDavid Woodhouse <dwmw2@infradead.org>2008-04-22 15:48:12 -0400
commitf0797881d59ab93d7d92c55411e0573977d909d4 (patch)
treeaeee6ac91a72631c57e201143e3d73af1a040c5e /drivers/mtd/ar7part.c
parent5c249c5a57dce2b47f1fb92093201b3a7013cb57 (diff)
[MTD] AR7 mtd partition map
Signed-off-by: Matteo Croce <technoboy85@gmail.com> Signed-off-by: Felix Fietkau <nbd@openwrt.org> Signed-off-by: Eugene Konev <ejka@imfi.kspu.ru> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Diffstat (limited to 'drivers/mtd/ar7part.c')
-rw-r--r--drivers/mtd/ar7part.c146
1 files changed, 146 insertions, 0 deletions
diff --git a/drivers/mtd/ar7part.c b/drivers/mtd/ar7part.c
new file mode 100644
index 000000000000..7722608d5a83
--- /dev/null
+++ b/drivers/mtd/ar7part.c
@@ -0,0 +1,146 @@
1/*
2 * Copyright © 2007 Eugene Konev <ejka@openwrt.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * TI AR7 flash partition table.
19 * Based on ar7 map by Felix Fietkau <nbd@openwrt.org>
20 *
21 */
22
23#include <linux/kernel.h>
24#include <linux/slab.h>
25
26#include <linux/mtd/mtd.h>
27#include <linux/mtd/partitions.h>
28#include <linux/bootmem.h>
29#include <linux/magic.h>
30
31#define AR7_PARTS 4
32#define ROOT_OFFSET 0xe0000
33
34#define LOADER_MAGIC1 le32_to_cpu(0xfeedfa42)
35#define LOADER_MAGIC2 le32_to_cpu(0xfeed1281)
36
37struct ar7_bin_rec {
38 unsigned int checksum;
39 unsigned int length;
40 unsigned int address;
41};
42
43static struct mtd_partition ar7_parts[AR7_PARTS];
44
45static int create_mtd_partitions(struct mtd_info *master,
46 struct mtd_partition **pparts,
47 unsigned long origin)
48{
49 struct ar7_bin_rec header;
50 unsigned int offset, len;
51 unsigned int pre_size = master->erasesize, post_size = 0;
52 unsigned int root_offset = ROOT_OFFSET;
53
54 int retries = 10;
55
56 ar7_parts[0].name = "loader";
57 ar7_parts[0].offset = 0;
58 ar7_parts[0].size = master->erasesize;
59 ar7_parts[0].mask_flags = MTD_WRITEABLE;
60
61 ar7_parts[1].name = "config";
62 ar7_parts[1].offset = 0;
63 ar7_parts[1].size = master->erasesize;
64 ar7_parts[1].mask_flags = 0;
65
66 do { /* Try 10 blocks starting from master->erasesize */
67 offset = pre_size;
68 master->read(master, offset,
69 sizeof(header), &len, (u8 *)&header);
70 if (!strncmp((char *)&header, "TIENV0.8", 8))
71 ar7_parts[1].offset = pre_size;
72 if (header.checksum == LOADER_MAGIC1)
73 break;
74 if (header.checksum == LOADER_MAGIC2)
75 break;
76 pre_size += master->erasesize;
77 } while (retries--);
78
79 pre_size = offset;
80
81 if (!ar7_parts[1].offset) {
82 ar7_parts[1].offset = master->size - master->erasesize;
83 post_size = master->erasesize;
84 }
85
86 switch (header.checksum) {
87 case LOADER_MAGIC1:
88 while (header.length) {
89 offset += sizeof(header) + header.length;
90 master->read(master, offset, sizeof(header),
91 &len, (u8 *)&header);
92 }
93 root_offset = offset + sizeof(header) + 4;
94 break;
95 case LOADER_MAGIC2:
96 while (header.length) {
97 offset += sizeof(header) + header.length;
98 master->read(master, offset, sizeof(header),
99 &len, (u8 *)&header);
100 }
101 root_offset = offset + sizeof(header) + 4 + 0xff;
102 root_offset &= ~(u32)0xff;
103 break;
104 default:
105 printk(KERN_WARNING "Unknown magic: %08x\n", header.checksum);
106 break;
107 }
108
109 master->read(master, root_offset,
110 sizeof(header), &len, (u8 *)&header);
111 if (header.checksum != SQUASHFS_MAGIC) {
112 root_offset += master->erasesize - 1;
113 root_offset &= ~(master->erasesize - 1);
114 }
115
116 ar7_parts[2].name = "linux";
117 ar7_parts[2].offset = pre_size;
118 ar7_parts[2].size = master->size - pre_size - post_size;
119 ar7_parts[2].mask_flags = 0;
120
121 ar7_parts[3].name = "rootfs";
122 ar7_parts[3].offset = root_offset;
123 ar7_parts[3].size = master->size - root_offset - post_size;
124 ar7_parts[3].mask_flags = 0;
125
126 *pparts = ar7_parts;
127 return AR7_PARTS;
128}
129
130static struct mtd_part_parser ar7_parser = {
131 .owner = THIS_MODULE,
132 .parse_fn = create_mtd_partitions,
133 .name = "ar7part",
134};
135
136static int __init ar7_parser_init(void)
137{
138 return register_mtd_parser(&ar7_parser);
139}
140
141module_init(ar7_parser_init);
142
143MODULE_LICENSE("GPL");
144MODULE_AUTHOR( "Felix Fietkau <nbd@openwrt.org>, "
145 "Eugene Konev <ejka@openwrt.org>");
146MODULE_DESCRIPTION("MTD partitioning for TI AR7");