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f0797881 MC |
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 | ||
37 | struct ar7_bin_rec { | |
38 | unsigned int checksum; | |
39 | unsigned int length; | |
40 | unsigned int address; | |
41 | }; | |
42 | ||
43 | static struct mtd_partition ar7_parts[AR7_PARTS]; | |
44 | ||
45 | static 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 | ||
130 | static struct mtd_part_parser ar7_parser = { | |
131 | .owner = THIS_MODULE, | |
132 | .parse_fn = create_mtd_partitions, | |
133 | .name = "ar7part", | |
134 | }; | |
135 | ||
136 | static int __init ar7_parser_init(void) | |
137 | { | |
138 | return register_mtd_parser(&ar7_parser); | |
139 | } | |
140 | ||
141 | module_init(ar7_parser_init); | |
142 | ||
143 | MODULE_LICENSE("GPL"); | |
144 | MODULE_AUTHOR( "Felix Fietkau <nbd@openwrt.org>, " | |
145 | "Eugene Konev <ejka@openwrt.org>"); | |
146 | MODULE_DESCRIPTION("MTD partitioning for TI AR7"); |