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70a3c167 JG |
1 | /* |
2 | * BCM63XX CFE image tag parser | |
3 | * | |
4 | * Copyright © 2006-2008 Florian Fainelli <florian@openwrt.org> | |
5 | * Mike Albon <malbon@openwrt.org> | |
6 | * Copyright © 2009-2010 Daniel Dickinson <openwrt@cshore.neomailbox.net> | |
5329d67c | 7 | * Copyright © 2011-2012 Jonas Gorski <jonas.gorski@gmail.com> |
70a3c167 JG |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
22 | * | |
23 | */ | |
24 | ||
25 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
26 | ||
f98872fc | 27 | #include <linux/crc32.h> |
70a3c167 JG |
28 | #include <linux/module.h> |
29 | #include <linux/kernel.h> | |
30 | #include <linux/slab.h> | |
31 | #include <linux/vmalloc.h> | |
32 | #include <linux/mtd/mtd.h> | |
33 | #include <linux/mtd/partitions.h> | |
34 | ||
35 | #include <asm/mach-bcm63xx/bcm963xx_tag.h> | |
f2d9739b | 36 | #include <asm/mach-bcm63xx/board_bcm963xx.h> |
70a3c167 JG |
37 | |
38 | #define BCM63XX_EXTENDED_SIZE 0xBFC00000 /* Extended flash address */ | |
39 | ||
678eb9bb JG |
40 | #define BCM63XX_MIN_CFE_SIZE 0x10000 /* always at least 64KiB */ |
41 | #define BCM63XX_MIN_NVRAM_SIZE 0x10000 /* always at least 64KiB */ | |
42 | ||
f2d9739b JG |
43 | #define BCM63XX_CFE_MAGIC_OFFSET 0x4e0 |
44 | ||
70a3c167 JG |
45 | static int bcm63xx_detect_cfe(struct mtd_info *master) |
46 | { | |
70a3c167 JG |
47 | char buf[9]; |
48 | int ret; | |
49 | size_t retlen; | |
50 | ||
329ad399 AB |
51 | ret = mtd_read(master, BCM963XX_CFE_VERSION_OFFSET, 5, &retlen, |
52 | (void *)buf); | |
f2d9739b JG |
53 | buf[retlen] = 0; |
54 | ||
55 | if (ret) | |
56 | return ret; | |
57 | ||
58 | if (strncmp("cfe-v", buf, 5) == 0) | |
59 | return 0; | |
60 | ||
61 | /* very old CFE's do not have the cfe-v string, so check for magic */ | |
329ad399 AB |
62 | ret = mtd_read(master, BCM63XX_CFE_MAGIC_OFFSET, 8, &retlen, |
63 | (void *)buf); | |
70a3c167 | 64 | buf[retlen] = 0; |
70a3c167 | 65 | |
f2d9739b | 66 | return strncmp("CFE1CFE1", buf, 8); |
70a3c167 JG |
67 | } |
68 | ||
69 | static int bcm63xx_parse_cfe_partitions(struct mtd_info *master, | |
70 | struct mtd_partition **pparts, | |
71 | struct mtd_part_parser_data *data) | |
72 | { | |
73 | /* CFE, NVRAM and global Linux are always present */ | |
74 | int nrparts = 3, curpart = 0; | |
75 | struct bcm_tag *buf; | |
76 | struct mtd_partition *parts; | |
77 | int ret; | |
78 | size_t retlen; | |
79 | unsigned int rootfsaddr, kerneladdr, spareaddr; | |
80 | unsigned int rootfslen, kernellen, sparelen, totallen; | |
678eb9bb | 81 | unsigned int cfelen, nvramlen; |
70a3c167 JG |
82 | int namelen = 0; |
83 | int i; | |
f98872fc | 84 | u32 computed_crc; |
5329d67c | 85 | bool rootfs_first = false; |
70a3c167 JG |
86 | |
87 | if (bcm63xx_detect_cfe(master)) | |
88 | return -EINVAL; | |
89 | ||
678eb9bb JG |
90 | cfelen = max_t(uint32_t, master->erasesize, BCM63XX_MIN_CFE_SIZE); |
91 | nvramlen = max_t(uint32_t, master->erasesize, BCM63XX_MIN_NVRAM_SIZE); | |
92 | ||
70a3c167 JG |
93 | /* Allocate memory for buffer */ |
94 | buf = vmalloc(sizeof(struct bcm_tag)); | |
95 | if (!buf) | |
96 | return -ENOMEM; | |
97 | ||
98 | /* Get the tag */ | |
329ad399 AB |
99 | ret = mtd_read(master, cfelen, sizeof(struct bcm_tag), &retlen, |
100 | (void *)buf); | |
678eb9bb | 101 | |
70a3c167 JG |
102 | if (retlen != sizeof(struct bcm_tag)) { |
103 | vfree(buf); | |
104 | return -EIO; | |
105 | } | |
106 | ||
f98872fc JG |
107 | computed_crc = crc32_le(IMAGETAG_CRC_START, (u8 *)buf, |
108 | offsetof(struct bcm_tag, header_crc)); | |
109 | if (computed_crc == buf->header_crc) { | |
110 | char *boardid = &(buf->board_id[0]); | |
111 | char *tagversion = &(buf->tag_version[0]); | |
112 | ||
5329d67c | 113 | sscanf(buf->flash_image_start, "%u", &rootfsaddr); |
f98872fc JG |
114 | sscanf(buf->kernel_address, "%u", &kerneladdr); |
115 | sscanf(buf->kernel_length, "%u", &kernellen); | |
116 | sscanf(buf->total_length, "%u", &totallen); | |
117 | ||
118 | pr_info("CFE boot tag found with version %s and board type %s\n", | |
119 | tagversion, boardid); | |
120 | ||
121 | kerneladdr = kerneladdr - BCM63XX_EXTENDED_SIZE; | |
5329d67c | 122 | rootfsaddr = rootfsaddr - BCM63XX_EXTENDED_SIZE; |
f98872fc JG |
123 | spareaddr = roundup(totallen, master->erasesize) + cfelen; |
124 | sparelen = master->size - spareaddr - nvramlen; | |
5329d67c JG |
125 | |
126 | if (rootfsaddr < kerneladdr) { | |
127 | /* default Broadcom layout */ | |
128 | rootfslen = kerneladdr - rootfsaddr; | |
129 | rootfs_first = true; | |
130 | } else { | |
131 | /* OpenWrt layout */ | |
132 | rootfsaddr = kerneladdr + kernellen; | |
133 | rootfslen = spareaddr - rootfsaddr; | |
134 | } | |
f98872fc JG |
135 | } else { |
136 | pr_warn("CFE boot tag CRC invalid (expected %08x, actual %08x)\n", | |
137 | buf->header_crc, computed_crc); | |
138 | kernellen = 0; | |
139 | rootfslen = 0; | |
140 | rootfsaddr = 0; | |
141 | spareaddr = cfelen; | |
142 | sparelen = master->size - cfelen - nvramlen; | |
143 | } | |
70a3c167 JG |
144 | |
145 | /* Determine number of partitions */ | |
146 | namelen = 8; | |
147 | if (rootfslen > 0) { | |
148 | nrparts++; | |
149 | namelen += 6; | |
150 | } | |
151 | if (kernellen > 0) { | |
152 | nrparts++; | |
153 | namelen += 6; | |
154 | } | |
155 | ||
156 | /* Ask kernel for more memory */ | |
157 | parts = kzalloc(sizeof(*parts) * nrparts + 10 * nrparts, GFP_KERNEL); | |
158 | if (!parts) { | |
159 | vfree(buf); | |
160 | return -ENOMEM; | |
161 | } | |
162 | ||
163 | /* Start building partition list */ | |
164 | parts[curpart].name = "CFE"; | |
165 | parts[curpart].offset = 0; | |
678eb9bb | 166 | parts[curpart].size = cfelen; |
70a3c167 JG |
167 | curpart++; |
168 | ||
169 | if (kernellen > 0) { | |
5329d67c JG |
170 | int kernelpart = curpart; |
171 | ||
172 | if (rootfslen > 0 && rootfs_first) | |
173 | kernelpart++; | |
174 | parts[kernelpart].name = "kernel"; | |
175 | parts[kernelpart].offset = kerneladdr; | |
176 | parts[kernelpart].size = kernellen; | |
70a3c167 JG |
177 | curpart++; |
178 | } | |
179 | ||
180 | if (rootfslen > 0) { | |
5329d67c JG |
181 | int rootfspart = curpart; |
182 | ||
183 | if (kernellen > 0 && rootfs_first) | |
184 | rootfspart--; | |
185 | parts[rootfspart].name = "rootfs"; | |
186 | parts[rootfspart].offset = rootfsaddr; | |
187 | parts[rootfspart].size = rootfslen; | |
188 | if (sparelen > 0 && !rootfs_first) | |
189 | parts[rootfspart].size += sparelen; | |
70a3c167 JG |
190 | curpart++; |
191 | } | |
192 | ||
193 | parts[curpart].name = "nvram"; | |
678eb9bb JG |
194 | parts[curpart].offset = master->size - nvramlen; |
195 | parts[curpart].size = nvramlen; | |
70a3c167 JG |
196 | |
197 | /* Global partition "linux" to make easy firmware upgrade */ | |
198 | curpart++; | |
199 | parts[curpart].name = "linux"; | |
327c62c5 JG |
200 | parts[curpart].offset = cfelen; |
201 | parts[curpart].size = master->size - cfelen - nvramlen; | |
70a3c167 JG |
202 | |
203 | for (i = 0; i < nrparts; i++) | |
204 | pr_info("Partition %d is %s offset %lx and length %lx\n", i, | |
205 | parts[i].name, (long unsigned int)(parts[i].offset), | |
206 | (long unsigned int)(parts[i].size)); | |
207 | ||
208 | pr_info("Spare partition is offset %x and length %x\n", spareaddr, | |
209 | sparelen); | |
210 | ||
211 | *pparts = parts; | |
212 | vfree(buf); | |
213 | ||
214 | return nrparts; | |
215 | }; | |
216 | ||
217 | static struct mtd_part_parser bcm63xx_cfe_parser = { | |
218 | .owner = THIS_MODULE, | |
219 | .parse_fn = bcm63xx_parse_cfe_partitions, | |
220 | .name = "bcm63xxpart", | |
221 | }; | |
222 | ||
223 | static int __init bcm63xx_cfe_parser_init(void) | |
224 | { | |
225 | return register_mtd_parser(&bcm63xx_cfe_parser); | |
226 | } | |
227 | ||
228 | static void __exit bcm63xx_cfe_parser_exit(void) | |
229 | { | |
230 | deregister_mtd_parser(&bcm63xx_cfe_parser); | |
231 | } | |
232 | ||
233 | module_init(bcm63xx_cfe_parser_init); | |
234 | module_exit(bcm63xx_cfe_parser_exit); | |
235 | ||
236 | MODULE_LICENSE("GPL"); | |
237 | MODULE_AUTHOR("Daniel Dickinson <openwrt@cshore.neomailbox.net>"); | |
238 | MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); | |
239 | MODULE_AUTHOR("Mike Albon <malbon@openwrt.org>"); | |
240 | MODULE_AUTHOR("Jonas Gorski <jonas.gorski@gmail.com"); | |
241 | MODULE_DESCRIPTION("MTD partitioning for BCM63XX CFE bootloaders"); |