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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 | #ifndef SQUASHFS_MAGIC |
38 | #define SQUASHFS_MAGIC 0x73717368 |
39 | #endif |
40 | |
41 | struct ar7_bin_rec { |
42 | unsigned int checksum; |
43 | unsigned int length; |
44 | unsigned int address; |
45 | }; |
46 | |
47 | static int create_mtd_partitions(struct mtd_info *master, |
48 | struct mtd_partition **pparts, |
49 | unsigned long origin) |
50 | { |
51 | struct ar7_bin_rec header; |
52 | unsigned int offset; |
53 | size_t len; |
54 | unsigned int pre_size = master->erasesize, post_size = 0; |
55 | unsigned int root_offset = ROOT_OFFSET; |
56 | |
57 | int retries = 10; |
58 | struct mtd_partition *ar7_parts; |
59 | |
60 | ar7_parts = kzalloc(sizeof(*ar7_parts) * AR7_PARTS, GFP_KERNEL); |
61 | if (!ar7_parts) |
62 | return -ENOMEM; |
63 | ar7_parts[0].name = "loader"; |
64 | ar7_parts[0].offset = 0; |
65 | ar7_parts[0].size = master->erasesize; |
66 | ar7_parts[0].mask_flags = MTD_WRITEABLE; |
67 | |
68 | ar7_parts[1].name = "config"; |
69 | ar7_parts[1].offset = 0; |
70 | ar7_parts[1].size = master->erasesize; |
71 | ar7_parts[1].mask_flags = 0; |
72 | |
73 | do { /* Try 10 blocks starting from master->erasesize */ |
74 | offset = pre_size; |
75 | master->read(master, offset, |
76 | sizeof(header), &len, (uint8_t *)&header); |
77 | if (!strncmp((char *)&header, "TIENV0.8", 8)) |
78 | ar7_parts[1].offset = pre_size; |
79 | if (header.checksum == LOADER_MAGIC1) |
80 | break; |
81 | if (header.checksum == LOADER_MAGIC2) |
82 | break; |
83 | pre_size += master->erasesize; |
84 | } while (retries--); |
85 | |
86 | pre_size = offset; |
87 | |
88 | if (!ar7_parts[1].offset) { |
89 | ar7_parts[1].offset = master->size - master->erasesize; |
90 | post_size = master->erasesize; |
91 | } |
92 | |
93 | switch (header.checksum) { |
94 | case LOADER_MAGIC1: |
95 | while (header.length) { |
96 | offset += sizeof(header) + header.length; |
97 | master->read(master, offset, sizeof(header), |
98 | &len, (uint8_t *)&header); |
99 | } |
100 | root_offset = offset + sizeof(header) + 4; |
101 | break; |
102 | case LOADER_MAGIC2: |
103 | while (header.length) { |
104 | offset += sizeof(header) + header.length; |
105 | master->read(master, offset, sizeof(header), |
106 | &len, (uint8_t *)&header); |
107 | } |
108 | root_offset = offset + sizeof(header) + 4 + 0xff; |
109 | root_offset &= ~(uint32_t)0xff; |
110 | break; |
111 | default: |
112 | printk(KERN_WARNING "Unknown magic: %08x\n", header.checksum); |
113 | break; |
114 | } |
115 | |
116 | master->read(master, root_offset, |
117 | sizeof(header), &len, (u8 *)&header); |
118 | if (header.checksum != SQUASHFS_MAGIC) { |
119 | root_offset += master->erasesize - 1; |
120 | root_offset &= ~(master->erasesize - 1); |
121 | } |
122 | |
123 | ar7_parts[2].name = "linux"; |
124 | ar7_parts[2].offset = pre_size; |
125 | ar7_parts[2].size = master->size - pre_size - post_size; |
126 | ar7_parts[2].mask_flags = 0; |
127 | |
128 | ar7_parts[3].name = "rootfs"; |
129 | ar7_parts[3].offset = root_offset; |
130 | ar7_parts[3].size = master->size - root_offset - post_size; |
131 | ar7_parts[3].mask_flags = 0; |
132 | |
133 | *pparts = ar7_parts; |
134 | return AR7_PARTS; |
135 | } |
136 | |
137 | static struct mtd_part_parser ar7_parser = { |
138 | .owner = THIS_MODULE, |
139 | .parse_fn = create_mtd_partitions, |
140 | .name = "ar7part", |
141 | }; |
142 | |
143 | static int __init ar7_parser_init(void) |
144 | { |
145 | return register_mtd_parser(&ar7_parser); |
146 | } |
147 | |
148 | module_init(ar7_parser_init); |
149 | |
150 | MODULE_LICENSE("GPL"); |
151 | MODULE_AUTHOR( "Felix Fietkau <nbd@openwrt.org>, " |
152 | "Eugene Konev <ejka@openwrt.org>"); |
153 | MODULE_DESCRIPTION("MTD partitioning for TI AR7"); |
154 |
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v2.6.34-rc5
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