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1 | /* |
2 | * libfdt - Flat Device Tree manipulation | |
3 | * Copyright (C) 2014 David Gibson <david@gibson.dropbear.id.au> | |
4 | * | |
5 | * libfdt is dual licensed: you can use it either under the terms of | |
6 | * the GPL, or the BSD license, at your option. | |
7 | * | |
8 | * a) This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License as | |
10 | * published by the Free Software Foundation; either version 2 of the | |
11 | * License, or (at your option) any later version. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public | |
19 | * License along with this library; if not, write to the Free | |
20 | * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, | |
21 | * MA 02110-1301 USA | |
22 | * | |
23 | * Alternatively, | |
24 | * | |
25 | * b) Redistribution and use in source and binary forms, with or | |
26 | * without modification, are permitted provided that the following | |
27 | * conditions are met: | |
28 | * | |
29 | * 1. Redistributions of source code must retain the above | |
30 | * copyright notice, this list of conditions and the following | |
31 | * disclaimer. | |
32 | * 2. Redistributions in binary form must reproduce the above | |
33 | * copyright notice, this list of conditions and the following | |
34 | * disclaimer in the documentation and/or other materials | |
35 | * provided with the distribution. | |
36 | * | |
37 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND | |
38 | * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, | |
39 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
40 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
41 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR | |
42 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
43 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
44 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
45 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
46 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
47 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR | |
48 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, | |
49 | * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
50 | */ | |
51 | #include "libfdt_env.h" | |
52 | ||
53 | #include <fdt.h> | |
54 | #include <libfdt.h> | |
55 | ||
56 | #include "libfdt_internal.h" | |
57 | ||
58 | int fdt_address_cells(const void *fdt, int nodeoffset) | |
59 | { | |
60 | const fdt32_t *ac; | |
61 | int val; | |
62 | int len; | |
63 | ||
64 | ac = fdt_getprop(fdt, nodeoffset, "#address-cells", &len); | |
65 | if (!ac) | |
66 | return 2; | |
67 | ||
68 | if (len != sizeof(*ac)) | |
69 | return -FDT_ERR_BADNCELLS; | |
70 | ||
71 | val = fdt32_to_cpu(*ac); | |
72 | if ((val <= 0) || (val > FDT_MAX_NCELLS)) | |
73 | return -FDT_ERR_BADNCELLS; | |
74 | ||
75 | return val; | |
76 | } | |
77 | ||
78 | int fdt_size_cells(const void *fdt, int nodeoffset) | |
79 | { | |
80 | const fdt32_t *sc; | |
81 | int val; | |
82 | int len; | |
83 | ||
84 | sc = fdt_getprop(fdt, nodeoffset, "#size-cells", &len); | |
85 | if (!sc) | |
86 | return 2; | |
87 | ||
88 | if (len != sizeof(*sc)) | |
89 | return -FDT_ERR_BADNCELLS; | |
90 | ||
91 | val = fdt32_to_cpu(*sc); | |
92 | if ((val < 0) || (val > FDT_MAX_NCELLS)) | |
93 | return -FDT_ERR_BADNCELLS; | |
94 | ||
95 | return val; | |
96 | } |