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