summaryrefslogtreecommitdiff
path: root/target/linux/ar71xx/files/drivers/mtd/wrt160nl_part.c
blob: 1ced8acc7b2a5768aa43210458935b598166cf3e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
/*
 * Copyright (C) 2009 Christian Daniel <cd@maintech.de>
 * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * TRX flash partition table.
 * Based on ar7 map by Felix Fietkau <nbd@openwrt.org>
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>

#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>

struct cybertan_header {
	char	magic[4];
	u8	res1[4];
	char	fw_date[3];
	char	fw_ver[3];
	char	id[4];
	char	hw_ver;
	char	unused;
	u8	flags[2];
	u8	res2[10];
};

#define TRX_PARTS	6
#define TRX_MAGIC	0x30524448
#define TRX_MAX_OFFSET	3

struct trx_header {
	uint32_t magic;           /* "HDR0" */
	uint32_t len;             /* Length of file including header */
	uint32_t crc32;           /* 32-bit CRC from flag_version to end of file */
	uint32_t flag_version;    /* 0:15 flags, 16:31 version */
	uint32_t offsets[TRX_MAX_OFFSET]; /* Offsets of partitions from start of header */
};

#define IH_MAGIC	0x27051956	/* Image Magic Number */
#define IH_NMLEN	32		/* Image Name Length */

struct uimage_header {
	uint32_t	ih_magic;	/* Image Header Magic Number */
	uint32_t	ih_hcrc;	/* Image Header CRC Checksum */
	uint32_t	ih_time;	/* Image Creation Timestamp */
	uint32_t	ih_size;	/* Image Data Size */
	uint32_t	ih_load;	/* Data» Load  Address */
	uint32_t	ih_ep;		/* Entry Point Address */
	uint32_t	ih_dcrc;	/* Image Data CRC Checksum */
	uint8_t		ih_os;		/* Operating System */
	uint8_t		ih_arch;	/* CPU architecture */
	uint8_t		ih_type;	/* Image Type */
	uint8_t		ih_comp;	/* Compression Type */
	uint8_t		ih_name[IH_NMLEN];	/* Image Name */
};

struct wrt160nl_header {
	struct cybertan_header	cybertan;
	struct trx_header	trx;
	struct uimage_header	uimage;
} __attribute__ ((packed));

#define WRT160NL_UBOOT_LEN	0x40000
#define WRT160NL_ART_LEN	0x10000
#define WRT160NL_NVRAM_LEN	0x10000

static int wrt160nl_parse_partitions(struct mtd_info *master,
				     struct mtd_partition **pparts,
				     struct mtd_part_parser_data *data)
{
	struct wrt160nl_header *header;
	struct trx_header *theader;
	struct uimage_header *uheader;
	struct mtd_partition *trx_parts;
	size_t retlen;
	unsigned int kernel_len;
	unsigned int uboot_len;
	unsigned int nvram_len;
	unsigned int art_len;
	int ret;

	uboot_len = max_t(unsigned int, master->erasesize, WRT160NL_UBOOT_LEN);
	nvram_len = max_t(unsigned int, master->erasesize, WRT160NL_NVRAM_LEN);
	art_len = max_t(unsigned int, master->erasesize, WRT160NL_ART_LEN);

	trx_parts = kzalloc(TRX_PARTS * sizeof(struct mtd_partition),
			    GFP_KERNEL);
	if (!trx_parts) {
		ret = -ENOMEM;
		goto out;
	}

	header = vmalloc(sizeof(*header));
	if (!header) {
		return -ENOMEM;
		goto free_parts;
	}

	ret = mtd_read(master, uboot_len, sizeof(*header),
		       &retlen, (void *) header);
	if (ret)
		goto free_hdr;

	if (retlen != sizeof(*header)) {
		ret = -EIO;
		goto free_hdr;
	}

	if (strncmp(header->cybertan.magic, "NL16", 4) != 0) {
		printk(KERN_NOTICE "%s: no WRT160NL signature found\n",
			master->name);
		goto free_hdr;
	}

	theader = &header->trx;
	if (le32_to_cpu(theader->magic) != TRX_MAGIC) {
		printk(KERN_NOTICE "%s: no TRX header found\n", master->name);
		goto free_hdr;
	}

	uheader = &header->uimage;
	if (uheader->ih_magic != IH_MAGIC) {
		printk(KERN_NOTICE "%s: no uImage found\n", master->name);
		goto free_hdr;
	}

	kernel_len = le32_to_cpu(theader->offsets[1]) +
		sizeof(struct cybertan_header);

	trx_parts[0].name = "u-boot";
	trx_parts[0].offset = 0;
	trx_parts[0].size = uboot_len;
	trx_parts[0].mask_flags = MTD_WRITEABLE;

	trx_parts[1].name = "kernel";
	trx_parts[1].offset = trx_parts[0].offset + trx_parts[0].size;
	trx_parts[1].size = kernel_len;
	trx_parts[1].mask_flags = 0;

	trx_parts[2].name = "rootfs";
	trx_parts[2].offset = trx_parts[1].offset + trx_parts[1].size;
	trx_parts[2].size = master->size - uboot_len - nvram_len - art_len -
		trx_parts[1].size;
	trx_parts[2].mask_flags = 0;

	trx_parts[3].name = "nvram";
	trx_parts[3].offset = master->size - nvram_len - art_len;
	trx_parts[3].size = nvram_len;
	trx_parts[3].mask_flags = MTD_WRITEABLE;

	trx_parts[4].name = "art";
	trx_parts[4].offset = master->size - art_len;
	trx_parts[4].size = art_len;
	trx_parts[4].mask_flags = MTD_WRITEABLE;

	trx_parts[5].name = "firmware";
	trx_parts[5].offset = uboot_len;
	trx_parts[5].size = master->size - uboot_len - nvram_len - art_len;
	trx_parts[5].mask_flags = 0;

	vfree(header);

	*pparts = trx_parts;
	return TRX_PARTS;

free_hdr:
	vfree(header);
free_parts:
	kfree(trx_parts);
out:
	return ret;
}

static struct mtd_part_parser wrt160nl_parser = {
	.owner		= THIS_MODULE,
	.parse_fn	= wrt160nl_parse_partitions,
	.name		= "wrt160nl",
};

static int __init wrt160nl_parser_init(void)
{
	return register_mtd_parser(&wrt160nl_parser);
}

module_init(wrt160nl_parser_init);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Christian Daniel <cd@maintech.de>");