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