1 | /* |
2 | * libfdt - Flat Device Tree manipulation |
3 | * Copyright (C) 2014 David Gibson <david@gibson.dropbear.id.au> |
4 | * Copyright (C) 2018 embedded brains GmbH |
5 | * |
6 | * libfdt is dual licensed: you can use it either under the terms of |
7 | * the GPL, or the BSD license, at your option. |
8 | * |
9 | * a) This library is free software; you can redistribute it and/or |
10 | * modify it under the terms of the GNU General Public License as |
11 | * published by the Free Software Foundation; either version 2 of the |
12 | * License, or (at your option) any later version. |
13 | * |
14 | * This library 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 |
20 | * License along with this library; if not, write to the Free |
21 | * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, |
22 | * MA 02110-1301 USA |
23 | * |
24 | * Alternatively, |
25 | * |
26 | * b) Redistribution and use in source and binary forms, with or |
27 | * without modification, are permitted provided that the following |
28 | * conditions are met: |
29 | * |
30 | * 1. Redistributions of source code must retain the above |
31 | * copyright notice, this list of conditions and the following |
32 | * disclaimer. |
33 | * 2. Redistributions in binary form must reproduce the above |
34 | * copyright notice, this list of conditions and the following |
35 | * disclaimer in the documentation and/or other materials |
36 | * provided with the distribution. |
37 | * |
38 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
39 | * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
40 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
41 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
42 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
43 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
45 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
46 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
48 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
49 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
50 | * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
51 | */ |
52 | #include "libfdt_env.h" |
53 | |
54 | #include <fdt.h> |
55 | #include <libfdt.h> |
56 | |
57 | #include "libfdt_internal.h" |
58 | |
59 | static int fdt_cells(const void *fdt, int nodeoffset, const char *name) |
60 | { |
61 | const fdt32_t *c; |
62 | int val; |
63 | int len; |
64 | |
65 | c = fdt_getprop(fdt, nodeoffset, name, &len); |
66 | if (!c) |
67 | return 2; |
68 | |
69 | if (len != sizeof(*c)) |
70 | return -FDT_ERR_BADNCELLS; |
71 | |
72 | val = fdt32_to_cpu(*c); |
73 | if ((val <= 0) || (val > FDT_MAX_NCELLS)) |
74 | return -FDT_ERR_BADNCELLS; |
75 | |
76 | return val; |
77 | } |
78 | |
79 | int fdt_address_cells(const void *fdt, int nodeoffset) |
80 | { |
81 | return fdt_cells(fdt, nodeoffset, "#address-cells" ); |
82 | } |
83 | |
84 | int fdt_size_cells(const void *fdt, int nodeoffset) |
85 | { |
86 | return fdt_cells(fdt, nodeoffset, "#size-cells" ); |
87 | } |
88 | |