David Gibson | 3da0f9a | 2006-11-27 16:21:28 +1100 | [diff] [blame] | 1 | /* |
| 2 | * libfdt - Flat Device Tree manipulation |
| 3 | * Copyright (C) 2006 David Gibson, IBM Corporation. |
| 4 | * |
| 5 | * This library is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU Lesser General Public License |
| 7 | * as published by the Free Software Foundation; either version 2.1 of |
| 8 | * the License, or (at your option) any later version. |
| 9 | * |
| 10 | * This library is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * Lesser General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU Lesser General Public |
| 16 | * License along with this library; if not, write to the Free Software |
| 17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | */ |
| 19 | #include "libfdt_env.h" |
| 20 | |
| 21 | #include <fdt.h> |
| 22 | #include <libfdt.h> |
| 23 | |
| 24 | #include "libfdt_internal.h" |
| 25 | |
David Gibson | 3da0f9a | 2006-11-27 16:21:28 +1100 | [diff] [blame] | 26 | #define OFFSET_CHECK_HEADER(fdt) \ |
| 27 | { \ |
| 28 | int err; \ |
David Gibson | 4236976 | 2006-12-01 15:07:19 +1100 | [diff] [blame] | 29 | if ((err = _fdt_check_header(fdt)) != 0) \ |
David Gibson | 3da0f9a | 2006-11-27 16:21:28 +1100 | [diff] [blame] | 30 | return OFFSET_ERROR(err); \ |
| 31 | } |
| 32 | |
David Gibson | 94993f4 | 2006-12-11 16:15:34 +1100 | [diff] [blame] | 33 | #define PTR_CHECK_HEADER(fdt) \ |
| 34 | { \ |
| 35 | int err; \ |
| 36 | if ((err = _fdt_check_header(fdt)) != 0) \ |
| 37 | return PTR_ERROR(err); \ |
| 38 | } |
| 39 | |
David Gibson | 73d6092 | 2006-12-15 15:12:47 +1100 | [diff] [blame^] | 40 | static int offset_streq(const void *fdt, int offset, |
David Gibson | 3da0f9a | 2006-11-27 16:21:28 +1100 | [diff] [blame] | 41 | const char *s, int len) |
| 42 | { |
| 43 | const char *p = fdt_offset_ptr(fdt, offset, len+1); |
| 44 | |
| 45 | if (! p) |
| 46 | /* short match */ |
| 47 | return 0; |
| 48 | |
| 49 | if (memcmp(p, s, len) != 0) |
| 50 | return 0; |
| 51 | |
| 52 | if (p[len] != '\0') |
| 53 | return 0; |
| 54 | |
| 55 | return 1; |
| 56 | } |
| 57 | |
David Gibson | 73d6092 | 2006-12-15 15:12:47 +1100 | [diff] [blame^] | 58 | char *fdt_string(const void *fdt, int stroffset) |
David Gibson | 3aa4cfd | 2006-11-29 16:34:30 +1100 | [diff] [blame] | 59 | { |
David Gibson | ede25de | 2006-12-01 15:02:10 +1100 | [diff] [blame] | 60 | return (char *)fdt + fdt_off_dt_strings(fdt) + stroffset; |
David Gibson | 3aa4cfd | 2006-11-29 16:34:30 +1100 | [diff] [blame] | 61 | } |
| 62 | |
David Gibson | 73d6092 | 2006-12-15 15:12:47 +1100 | [diff] [blame^] | 63 | int fdt_subnode_offset_namelen(const void *fdt, int parentoffset, |
David Gibson | 3da0f9a | 2006-11-27 16:21:28 +1100 | [diff] [blame] | 64 | const char *name, int namelen) |
| 65 | { |
| 66 | int level = 0; |
| 67 | uint32_t tag; |
| 68 | int offset, nextoffset; |
| 69 | |
| 70 | OFFSET_CHECK_HEADER(fdt); |
| 71 | |
| 72 | tag = _fdt_next_tag(fdt, parentoffset, &nextoffset); |
| 73 | if (tag != FDT_BEGIN_NODE) |
| 74 | return OFFSET_ERROR(FDT_ERR_BADOFFSET); |
| 75 | |
| 76 | do { |
| 77 | offset = nextoffset; |
| 78 | tag = _fdt_next_tag(fdt, offset, &nextoffset); |
| 79 | |
| 80 | switch (tag) { |
| 81 | case FDT_END: |
| 82 | return OFFSET_ERROR(FDT_ERR_TRUNCATED); |
| 83 | |
| 84 | case FDT_BEGIN_NODE: |
| 85 | level++; |
| 86 | if (level != 1) |
| 87 | continue; |
| 88 | if (offset_streq(fdt, offset+FDT_TAGSIZE, name, namelen)) |
| 89 | /* Found it! */ |
| 90 | return offset; |
| 91 | break; |
| 92 | |
| 93 | case FDT_END_NODE: |
| 94 | level--; |
| 95 | break; |
| 96 | |
| 97 | case FDT_PROP: |
| 98 | case FDT_NOP: |
| 99 | break; |
| 100 | |
| 101 | default: |
| 102 | return OFFSET_ERROR(FDT_ERR_BADSTRUCTURE); |
| 103 | } |
| 104 | } while (level >= 0); |
| 105 | |
| 106 | return OFFSET_ERROR(FDT_ERR_NOTFOUND); |
| 107 | } |
| 108 | |
David Gibson | 73d6092 | 2006-12-15 15:12:47 +1100 | [diff] [blame^] | 109 | int fdt_subnode_offset(const void *fdt, int parentoffset, |
David Gibson | 3da0f9a | 2006-11-27 16:21:28 +1100 | [diff] [blame] | 110 | const char *name) |
| 111 | { |
| 112 | return fdt_subnode_offset_namelen(fdt, parentoffset, name, strlen(name)); |
| 113 | } |
| 114 | |
David Gibson | 73d6092 | 2006-12-15 15:12:47 +1100 | [diff] [blame^] | 115 | int fdt_path_offset(const void *fdt, const char *path) |
David Gibson | 3da0f9a | 2006-11-27 16:21:28 +1100 | [diff] [blame] | 116 | { |
| 117 | const char *end = path + strlen(path); |
| 118 | const char *p = path; |
| 119 | int offset = 0; |
| 120 | |
| 121 | OFFSET_CHECK_HEADER(fdt); |
| 122 | |
| 123 | if (*path != '/') |
| 124 | return OFFSET_ERROR(FDT_ERR_BADPATH); |
| 125 | |
| 126 | while (*p) { |
| 127 | const char *q; |
| 128 | |
| 129 | while (*p == '/') |
| 130 | p++; |
| 131 | if (! *p) |
| 132 | return OFFSET_ERROR(FDT_ERR_BADPATH); |
| 133 | q = strchr(p, '/'); |
| 134 | if (! q) |
| 135 | q = end; |
| 136 | |
| 137 | offset = fdt_subnode_offset_namelen(fdt, offset, p, q-p); |
| 138 | if (fdt_offset_error(offset)) |
| 139 | return offset; |
| 140 | |
| 141 | p = q; |
| 142 | } |
| 143 | |
| 144 | return offset; |
| 145 | } |
| 146 | |
David Gibson | 73d6092 | 2006-12-15 15:12:47 +1100 | [diff] [blame^] | 147 | struct fdt_property *fdt_get_property(const void *fdt, |
David Gibson | 94993f4 | 2006-12-11 16:15:34 +1100 | [diff] [blame] | 148 | int nodeoffset, |
| 149 | const char *name, int *lenp) |
David Gibson | 3da0f9a | 2006-11-27 16:21:28 +1100 | [diff] [blame] | 150 | { |
David Gibson | 94993f4 | 2006-12-11 16:15:34 +1100 | [diff] [blame] | 151 | int level = 0; |
| 152 | uint32_t tag; |
David Gibson | 3da0f9a | 2006-11-27 16:21:28 +1100 | [diff] [blame] | 153 | struct fdt_property *prop; |
David Gibson | 94993f4 | 2006-12-11 16:15:34 +1100 | [diff] [blame] | 154 | int namestroff; |
| 155 | int offset, nextoffset; |
David Gibson | 3da0f9a | 2006-11-27 16:21:28 +1100 | [diff] [blame] | 156 | |
David Gibson | 94993f4 | 2006-12-11 16:15:34 +1100 | [diff] [blame] | 157 | PTR_CHECK_HEADER(fdt); |
David Gibson | 3da0f9a | 2006-11-27 16:21:28 +1100 | [diff] [blame] | 158 | |
David Gibson | 94993f4 | 2006-12-11 16:15:34 +1100 | [diff] [blame] | 159 | if (nodeoffset % FDT_TAGSIZE) |
| 160 | return PTR_ERROR(FDT_ERR_BADOFFSET); |
David Gibson | 3da0f9a | 2006-11-27 16:21:28 +1100 | [diff] [blame] | 161 | |
David Gibson | 94993f4 | 2006-12-11 16:15:34 +1100 | [diff] [blame] | 162 | tag = _fdt_next_tag(fdt, nodeoffset, &nextoffset); |
| 163 | if (tag != FDT_BEGIN_NODE) |
| 164 | return PTR_ERROR(FDT_ERR_BADOFFSET); |
David Gibson | 3da0f9a | 2006-11-27 16:21:28 +1100 | [diff] [blame] | 165 | |
David Gibson | 94993f4 | 2006-12-11 16:15:34 +1100 | [diff] [blame] | 166 | do { |
| 167 | offset = nextoffset; |
| 168 | if (offset % FDT_TAGSIZE) |
| 169 | return PTR_ERROR(FDT_ERR_INTERNAL); |
| 170 | |
| 171 | tag = _fdt_next_tag(fdt, offset, &nextoffset); |
| 172 | switch (tag) { |
| 173 | case FDT_END: |
| 174 | return PTR_ERROR(FDT_ERR_TRUNCATED); |
| 175 | |
| 176 | case FDT_BEGIN_NODE: |
| 177 | level++; |
| 178 | break; |
| 179 | |
| 180 | case FDT_END_NODE: |
| 181 | level--; |
| 182 | break; |
| 183 | |
| 184 | case FDT_PROP: |
| 185 | if (level != 0) |
| 186 | continue; |
| 187 | |
| 188 | prop = fdt_offset_ptr_typed(fdt, offset, prop); |
| 189 | if (! prop) |
| 190 | return PTR_ERROR(FDT_ERR_BADSTRUCTURE); |
| 191 | namestroff = fdt32_to_cpu(prop->nameoff); |
| 192 | if (streq(fdt_string(fdt, namestroff), name)) { |
| 193 | /* Found it! */ |
| 194 | int len = fdt32_to_cpu(prop->len); |
| 195 | prop = fdt_offset_ptr(fdt, offset, |
David Gibson | 9825f82 | 2006-12-14 15:29:25 +1100 | [diff] [blame] | 196 | sizeof(*prop)+len); |
David Gibson | 94993f4 | 2006-12-11 16:15:34 +1100 | [diff] [blame] | 197 | if (! prop) |
| 198 | return PTR_ERROR(FDT_ERR_BADSTRUCTURE); |
| 199 | |
| 200 | if (lenp) |
| 201 | *lenp = len; |
| 202 | |
| 203 | return prop; |
| 204 | } |
| 205 | break; |
| 206 | |
| 207 | case FDT_NOP: |
| 208 | break; |
| 209 | |
| 210 | default: |
| 211 | return PTR_ERROR(FDT_ERR_BADSTRUCTURE); |
| 212 | } |
| 213 | } while (level >= 0); |
| 214 | |
| 215 | return PTR_ERROR(FDT_ERR_NOTFOUND); |
David Gibson | 3da0f9a | 2006-11-27 16:21:28 +1100 | [diff] [blame] | 216 | } |
| 217 | |
David Gibson | 73d6092 | 2006-12-15 15:12:47 +1100 | [diff] [blame^] | 218 | void *fdt_getprop(const void *fdt, int nodeoffset, |
David Gibson | 3da0f9a | 2006-11-27 16:21:28 +1100 | [diff] [blame] | 219 | const char *name, int *lenp) |
| 220 | { |
| 221 | const struct fdt_property *prop; |
| 222 | int err; |
| 223 | |
David Gibson | 94993f4 | 2006-12-11 16:15:34 +1100 | [diff] [blame] | 224 | prop = fdt_get_property(fdt, nodeoffset, name, lenp); |
David Gibson | 3da0f9a | 2006-11-27 16:21:28 +1100 | [diff] [blame] | 225 | if ((err = fdt_ptr_error(prop))) |
| 226 | return PTR_ERROR(err); |
| 227 | |
| 228 | return prop->data; |
| 229 | } |