ar71xx: update image generation and trx header parsing for the WRT160NL
[openwrt/svn-archive/archive.git] / target / linux / ar71xx / files / drivers / mtd / wrt160nl_part.c
1 /*
2 * Copyright (C) 2009 Christian Daniel <cd@maintech.de>
3 * Copyright (C) 2009 Gabor Juhos <juhosg@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 * TRX flash partition table.
20 * Based on ar7 map by Felix Fietkau <nbd@openwrt.org>
21 *
22 */
23
24 #include <linux/kernel.h>
25 #include <linux/slab.h>
26 #include <linux/vmalloc.h>
27
28 #include <linux/mtd/mtd.h>
29 #include <linux/mtd/partitions.h>
30
31 struct cybertan_header {
32 char magic[4];
33 u8 res1[4];
34 char fw_date[3];
35 char fw_ver[3];
36 char id[4];
37 char hw_ver;
38 char unused;
39 u8 flags[2];
40 u8 res2[10];
41 };
42
43 #define TRX_PARTS 6
44 #define TRX_MAGIC 0x30524448
45 #define TRX_MAX_OFFSET 3
46
47 struct trx_header {
48 uint32_t magic; /* "HDR0" */
49 uint32_t len; /* Length of file including header */
50 uint32_t crc32; /* 32-bit CRC from flag_version to end of file */
51 uint32_t flag_version; /* 0:15 flags, 16:31 version */
52 uint32_t offsets[TRX_MAX_OFFSET]; /* Offsets of partitions from start of header */
53 };
54
55 #define IH_MAGIC 0x27051956 /* Image Magic Number */
56 #define IH_NMLEN 32 /* Image Name Length */
57
58 struct uimage_header {
59 uint32_t ih_magic; /* Image Header Magic Number */
60 uint32_t ih_hcrc; /* Image Header CRC Checksum */
61 uint32_t ih_time; /* Image Creation Timestamp */
62 uint32_t ih_size; /* Image Data Size */
63 uint32_t ih_load; /* Data┬╗ Load Address */
64 uint32_t ih_ep; /* Entry Point Address */
65 uint32_t ih_dcrc; /* Image Data CRC Checksum */
66 uint8_t ih_os; /* Operating System */
67 uint8_t ih_arch; /* CPU architecture */
68 uint8_t ih_type; /* Image Type */
69 uint8_t ih_comp; /* Compression Type */
70 uint8_t ih_name[IH_NMLEN]; /* Image Name */
71 };
72
73 struct wrt160nl_header {
74 struct cybertan_header cybertan;
75 struct trx_header trx;
76 struct uimage_header uimage;
77 } __attribute__ ((packed));
78
79 static struct mtd_partition trx_parts[TRX_PARTS];
80
81 static int wrt160nl_parse_partitions(struct mtd_info *master,
82 struct mtd_partition **pparts,
83 unsigned long origin)
84 {
85 struct wrt160nl_header *header;
86 struct trx_header *theader;
87 struct uimage_header *uheader;
88 size_t retlen;
89 unsigned int kernel_len;
90 int ret;
91
92 header = vmalloc(sizeof(*header));
93 if (!header) {
94 return -ENOMEM;
95 goto out;
96 }
97
98 ret = master->read(master, 4 * master->erasesize, sizeof(*header),
99 &retlen, (void *) header);
100 if (ret)
101 goto free_hdr;
102
103 if (retlen != sizeof(*header)) {
104 ret = -EIO;
105 goto free_hdr;
106 }
107
108 if (strncmp(header->cybertan.magic, "NL16", 4) != 0) {
109 printk(KERN_NOTICE "%s: no WRT160NL signature found\n",
110 master->name);
111 goto free_hdr;
112 }
113
114 theader = &header->trx;
115 if (le32_to_cpu(theader->magic) != TRX_MAGIC) {
116 printk(KERN_NOTICE "%s: no TRX header found\n", master->name);
117 goto free_hdr;
118 }
119
120 uheader = &header->uimage;
121 if (uheader->ih_magic != IH_MAGIC) {
122 printk(KERN_NOTICE "%s: no uImage found\n", master->name);
123 goto free_hdr;
124 }
125
126 kernel_len = le32_to_cpu(theader->offsets[1]) + sizeof(struct cybertan_header);
127
128 trx_parts[0].name = "u-boot";
129 trx_parts[0].offset = 0;
130 trx_parts[0].size = 4 * master->erasesize;
131 trx_parts[0].mask_flags = MTD_WRITEABLE;
132
133 trx_parts[1].name = "kernel";
134 trx_parts[1].offset = trx_parts[0].offset + trx_parts[0].size;
135 trx_parts[1].size = kernel_len;
136 trx_parts[1].mask_flags = 0;
137
138 trx_parts[2].name = "rootfs";
139 trx_parts[2].offset = trx_parts[1].offset + trx_parts[1].size;
140 trx_parts[2].size = master->size - 6 * master->erasesize - trx_parts[1].size;
141 trx_parts[2].mask_flags = 0;
142
143 trx_parts[3].name = "nvram";
144 trx_parts[3].offset = master->size - 2 * master->erasesize;
145 trx_parts[3].size = master->erasesize;
146 trx_parts[3].mask_flags = MTD_WRITEABLE;
147
148 trx_parts[4].name = "art";
149 trx_parts[4].offset = master->size - master->erasesize;
150 trx_parts[4].size = master->erasesize;
151 trx_parts[4].mask_flags = MTD_WRITEABLE;
152
153 trx_parts[5].name = "firmware";
154 trx_parts[5].offset = 4 * master->erasesize;
155 trx_parts[5].size = master->size - 6 * master->erasesize;
156 trx_parts[5].mask_flags = 0;
157
158 *pparts = trx_parts;
159 ret = TRX_PARTS;
160
161 free_hdr:
162 vfree(header);
163 out:
164 return ret;
165 }
166
167 static struct mtd_part_parser wrt160nl_parser = {
168 .owner = THIS_MODULE,
169 .parse_fn = wrt160nl_parse_partitions,
170 .name = "wrt160nl",
171 };
172
173 static int __init wrt160nl_parser_init(void)
174 {
175 return register_mtd_parser(&wrt160nl_parser);
176 }
177
178 module_init(wrt160nl_parser_init);
179
180 MODULE_LICENSE("GPL");
181 MODULE_AUTHOR("Christian Daniel <cd@maintech.de>");