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
59static 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
79int fdt_address_cells(const void *fdt, int nodeoffset)
80{
81 return fdt_cells(fdt, nodeoffset, "#address-cells");
82}
83
84int fdt_size_cells(const void *fdt, int nodeoffset)
85{
86 return fdt_cells(fdt, nodeoffset, "#size-cells");
87}
88