OpenWrt – Blame information for rev 2
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1 | office | 1 | /* |
2 | * AudioCodes AC49x PSPBoot-based flash partition table |
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3 | * Copyright 2012 Daniel Golle <daniel.golle@gmail.com> |
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4 | * |
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5 | * This program is free software; you can redistribute it and/or modify |
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6 | * it under the terms of the GNU General Public License as published by |
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7 | * the Free Software Foundation; either version 2 of the License, or |
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8 | * (at your option) any later version. |
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9 | * |
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10 | * This program is distributed in the hope that it will be useful, |
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11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 | * GNU General Public License for more details. |
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14 | * |
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15 | * You should have received a copy of the GNU General Public License |
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16 | * along with this program; if not, write to the Free Software |
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17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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18 | * |
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19 | */ |
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20 | |||
21 | #include <linux/kernel.h> |
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22 | #include <linux/slab.h> |
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23 | |||
24 | #include <linux/mtd/mtd.h> |
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25 | #include <linux/mtd/partitions.h> |
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26 | #include <linux/bootmem.h> |
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27 | #include <linux/magic.h> |
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28 | #include <linux/module.h> |
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29 | |||
30 | #include <asm/mach-ar7/prom.h> |
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31 | |||
32 | #define AC49X_MAXENVPARTS 8 |
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33 | |||
34 | #define AC49X_PARTTYPE_LOADER 0 |
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35 | #define AC49X_PARTTYPE_BOOTENV 1 |
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36 | #define AC49X_PARTTYPE_LINUX 2 |
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37 | #define AC49X_PARTTYPE_ROOTFS 3 |
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38 | #define AC49X_PARTTYPE_UNKNOWN 4 |
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39 | #define AC49X_NUM_PARTTYPES 5 |
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40 | |||
41 | #define AC49X_FLASH_ADDRMASK 0x00FFFFFF |
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42 | |||
43 | #define AC49X_LOADER_MAGIC 0x40809000 |
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44 | #define AC49X_LINUX_MAGIC 0x464c457f /* ELF */ |
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45 | #define AC49X_BOOTENV_MAGIC 0x4578614d /* MaxE */ |
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46 | |||
47 | #define ROOTFS_MIN_OFFSET 0xC0000 |
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48 | |||
49 | int parse_partvar(const unsigned char *partvar, struct mtd_partition *part) |
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50 | { |
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51 | unsigned int partstart, partend; |
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52 | unsigned int pnum; |
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53 | |||
54 | pnum = sscanf(partvar, "0x%x,0x%x", &partstart, &partend); |
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55 | if (pnum != 2) |
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56 | return 1; |
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57 | |||
58 | part->offset = partstart & AC49X_FLASH_ADDRMASK; |
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59 | part->size = partend - partstart; |
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60 | |||
61 | return 0; |
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62 | } |
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63 | |||
64 | int detect_parttype(struct mtd_info *master, struct mtd_partition part) |
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65 | { |
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66 | unsigned int magic; |
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67 | size_t len; |
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68 | |||
69 | if (part.size < 4) |
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70 | return -1; |
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71 | |||
72 | mtd_read(master, part.offset, sizeof(magic), &len, |
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73 | (uint8_t *)&magic); |
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74 | |||
75 | if (len != sizeof(magic)) |
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76 | return -1; |
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77 | |||
78 | switch (magic) { |
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79 | case AC49X_LOADER_MAGIC: |
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80 | return AC49X_PARTTYPE_LOADER; |
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81 | case AC49X_LINUX_MAGIC: |
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82 | return AC49X_PARTTYPE_LINUX; |
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83 | case SQUASHFS_MAGIC: |
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84 | case CRAMFS_MAGIC: |
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85 | case CRAMFS_MAGIC_WEND: |
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86 | return AC49X_PARTTYPE_ROOTFS; |
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87 | case AC49X_BOOTENV_MAGIC: |
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88 | return AC49X_PARTTYPE_BOOTENV; |
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89 | default: |
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90 | switch (magic & 0xFF) { |
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91 | case JFFS2_SUPER_MAGIC: |
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92 | return AC49X_PARTTYPE_ROOTFS; |
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93 | } |
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94 | switch (magic >> 8) { |
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95 | case JFFS2_SUPER_MAGIC: |
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96 | return AC49X_PARTTYPE_ROOTFS; |
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97 | } |
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98 | return AC49X_PARTTYPE_UNKNOWN; |
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99 | } |
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100 | } |
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101 | |||
102 | const char *partnames[] = { |
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103 | "loader", |
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104 | "config", |
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105 | "linux", |
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106 | "rootfs", |
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107 | "data" |
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108 | }; |
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109 | |||
110 | void gen_partname(unsigned int type, |
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111 | unsigned int *typenumeration, |
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112 | struct mtd_partition *part) |
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113 | { |
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114 | char *s = kzalloc(sizeof(char) * 8, GFP_KERNEL); |
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115 | |||
116 | (typenumeration[type])++; |
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117 | if (typenumeration[type] == 1) |
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118 | sprintf(s, "%s", partnames[type]); |
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119 | else |
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120 | sprintf(s, "%s%d", partnames[type], typenumeration[type]); |
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121 | |||
122 | part->name = s; |
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123 | } |
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124 | |||
125 | static int create_mtd_partitions(struct mtd_info *master, |
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126 | const struct mtd_partition **pparts, |
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127 | struct mtd_part_parser_data *data) |
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128 | { |
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129 | unsigned int envpartnum = 0, linuxpartnum = 0; |
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130 | unsigned int typenumeration[5] = { 0, 0, 0, 0, 0 }; |
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131 | unsigned char evn[5]; |
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132 | const unsigned char *partvar = NULL; |
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133 | |||
134 | struct mtd_partition *ac49x_parts; |
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135 | |||
136 | ac49x_parts = kzalloc(sizeof(*ac49x_parts) * AC49X_MAXENVPARTS, |
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137 | GFP_KERNEL); |
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138 | |||
139 | if (!ac49x_parts) |
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140 | return -ENOMEM; |
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141 | |||
142 | linuxpartnum = 0; |
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143 | for (envpartnum = 0; envpartnum < AC49X_MAXENVPARTS; envpartnum++) { |
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144 | struct mtd_partition parsepart; |
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145 | unsigned int offset, size, type; |
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146 | int err; |
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147 | sprintf(evn, "mtd%d", envpartnum); |
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148 | partvar = prom_getenv(evn); |
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149 | if (!partvar) |
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150 | continue; |
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151 | err = parse_partvar(partvar, &parsepart); |
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152 | if (err) |
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153 | continue; |
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154 | offset = parsepart.offset; |
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155 | size = parsepart.size; |
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156 | type = detect_parttype(master, parsepart); |
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157 | gen_partname(type, typenumeration, &parsepart); |
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158 | /* protect loader */ |
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159 | if (type == AC49X_PARTTYPE_LOADER) |
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160 | parsepart.mask_flags = MTD_WRITEABLE; |
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161 | else |
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162 | parsepart.mask_flags = 0; |
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163 | |||
164 | memcpy(&(ac49x_parts[linuxpartnum]), &parsepart, |
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165 | sizeof(struct mtd_partition)); |
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166 | |||
167 | /* scan for contained rootfs */ |
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168 | if (type == AC49X_PARTTYPE_LINUX) { |
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169 | parsepart.offset += ROOTFS_MIN_OFFSET & |
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170 | ~(master->erasesize - 1); |
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171 | parsepart.size -= ROOTFS_MIN_OFFSET & |
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172 | ~(master->erasesize - 1); |
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173 | do { |
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174 | unsigned int size, offset; |
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175 | size = parsepart.size; |
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176 | offset = parsepart.offset; |
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177 | |||
178 | type = detect_parttype(master, parsepart); |
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179 | if (type == AC49X_PARTTYPE_ROOTFS) { |
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180 | gen_partname(type, typenumeration, |
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181 | &parsepart); |
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182 | printk(KERN_INFO |
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183 | "%s %s: 0x%08x@0x%08x\n", |
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184 | "detected sub-partition", |
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185 | parsepart.name, |
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186 | (unsigned int)parsepart.size, |
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187 | (unsigned int)parsepart.offset); |
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188 | linuxpartnum++; |
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189 | memcpy(&(ac49x_parts[linuxpartnum]), |
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190 | &parsepart, |
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191 | sizeof(struct mtd_partition)); |
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192 | break; |
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193 | } |
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194 | parsepart.offset += master->erasesize; |
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195 | parsepart.size -= master->erasesize; |
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196 | } while (parsepart.size >= master->erasesize); |
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197 | } |
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198 | linuxpartnum++; |
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199 | } |
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200 | |||
201 | *pparts = ac49x_parts; |
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202 | return linuxpartnum; |
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203 | } |
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204 | |||
205 | static struct mtd_part_parser ac49x_parser = { |
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206 | .owner = THIS_MODULE, |
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207 | .parse_fn = create_mtd_partitions, |
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208 | .name = "ac49xpart", |
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209 | }; |
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210 | |||
211 | static int __init ac49x_parser_init(void) |
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212 | { |
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213 | register_mtd_parser(&ac49x_parser); |
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214 | return 0; |
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215 | } |
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216 | |||
217 | module_init(ac49x_parser_init); |
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218 | |||
219 | MODULE_LICENSE("GPL"); |
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220 | MODULE_AUTHOR("Daniel Golle <daniel.golle@gmail.com>"); |
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221 | MODULE_DESCRIPTION("MTD partitioning for AudioCodes AC49x"); |