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
fdt_address_cells(const void * fdt,int nodeoffset)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
fdt_size_cells(const void * fdt,int nodeoffset)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 }
97