1*14df9b24SMasahiro Yamada /*
2*14df9b24SMasahiro Yamada * libfdt - Flat Device Tree manipulation
3*14df9b24SMasahiro Yamada * Copyright (C) 2014 David Gibson <david@gibson.dropbear.id.au>
4*14df9b24SMasahiro Yamada *
5*14df9b24SMasahiro Yamada * libfdt is dual licensed: you can use it either under the terms of
6*14df9b24SMasahiro Yamada * the GPL, or the BSD license, at your option.
7*14df9b24SMasahiro Yamada *
8*14df9b24SMasahiro Yamada * a) This library is free software; you can redistribute it and/or
9*14df9b24SMasahiro Yamada * modify it under the terms of the GNU General Public License as
10*14df9b24SMasahiro Yamada * published by the Free Software Foundation; either version 2 of the
11*14df9b24SMasahiro Yamada * License, or (at your option) any later version.
12*14df9b24SMasahiro Yamada *
13*14df9b24SMasahiro Yamada * This library is distributed in the hope that it will be useful,
14*14df9b24SMasahiro Yamada * but WITHOUT ANY WARRANTY; without even the implied warranty of
15*14df9b24SMasahiro Yamada * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16*14df9b24SMasahiro Yamada * GNU General Public License for more details.
17*14df9b24SMasahiro Yamada *
18*14df9b24SMasahiro Yamada * You should have received a copy of the GNU General Public
19*14df9b24SMasahiro Yamada * License along with this library; if not, write to the Free
20*14df9b24SMasahiro Yamada * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
21*14df9b24SMasahiro Yamada * MA 02110-1301 USA
22*14df9b24SMasahiro Yamada *
23*14df9b24SMasahiro Yamada * Alternatively,
24*14df9b24SMasahiro Yamada *
25*14df9b24SMasahiro Yamada * b) Redistribution and use in source and binary forms, with or
26*14df9b24SMasahiro Yamada * without modification, are permitted provided that the following
27*14df9b24SMasahiro Yamada * conditions are met:
28*14df9b24SMasahiro Yamada *
29*14df9b24SMasahiro Yamada * 1. Redistributions of source code must retain the above
30*14df9b24SMasahiro Yamada * copyright notice, this list of conditions and the following
31*14df9b24SMasahiro Yamada * disclaimer.
32*14df9b24SMasahiro Yamada * 2. Redistributions in binary form must reproduce the above
33*14df9b24SMasahiro Yamada * copyright notice, this list of conditions and the following
34*14df9b24SMasahiro Yamada * disclaimer in the documentation and/or other materials
35*14df9b24SMasahiro Yamada * provided with the distribution.
36*14df9b24SMasahiro Yamada *
37*14df9b24SMasahiro Yamada * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
38*14df9b24SMasahiro Yamada * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
39*14df9b24SMasahiro Yamada * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
40*14df9b24SMasahiro Yamada * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
41*14df9b24SMasahiro Yamada * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
42*14df9b24SMasahiro Yamada * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43*14df9b24SMasahiro Yamada * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44*14df9b24SMasahiro Yamada * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45*14df9b24SMasahiro Yamada * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46*14df9b24SMasahiro Yamada * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
47*14df9b24SMasahiro Yamada * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
48*14df9b24SMasahiro Yamada * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
49*14df9b24SMasahiro Yamada * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
50*14df9b24SMasahiro Yamada */
51*14df9b24SMasahiro Yamada #include "libfdt_env.h"
52*14df9b24SMasahiro Yamada
53*14df9b24SMasahiro Yamada #include <fdt.h>
54*14df9b24SMasahiro Yamada #include <libfdt.h>
55*14df9b24SMasahiro Yamada
56*14df9b24SMasahiro Yamada #include "libfdt_internal.h"
57*14df9b24SMasahiro Yamada
fdt_address_cells(const void * fdt,int nodeoffset)58*14df9b24SMasahiro Yamada int fdt_address_cells(const void *fdt, int nodeoffset)
59*14df9b24SMasahiro Yamada {
60*14df9b24SMasahiro Yamada const fdt32_t *ac;
61*14df9b24SMasahiro Yamada int val;
62*14df9b24SMasahiro Yamada int len;
63*14df9b24SMasahiro Yamada
64*14df9b24SMasahiro Yamada ac = fdt_getprop(fdt, nodeoffset, "#address-cells", &len);
65*14df9b24SMasahiro Yamada if (!ac)
66*14df9b24SMasahiro Yamada return 2;
67*14df9b24SMasahiro Yamada
68*14df9b24SMasahiro Yamada if (len != sizeof(*ac))
69*14df9b24SMasahiro Yamada return -FDT_ERR_BADNCELLS;
70*14df9b24SMasahiro Yamada
71*14df9b24SMasahiro Yamada val = fdt32_to_cpu(*ac);
72*14df9b24SMasahiro Yamada if ((val <= 0) || (val > FDT_MAX_NCELLS))
73*14df9b24SMasahiro Yamada return -FDT_ERR_BADNCELLS;
74*14df9b24SMasahiro Yamada
75*14df9b24SMasahiro Yamada return val;
76*14df9b24SMasahiro Yamada }
77*14df9b24SMasahiro Yamada
fdt_size_cells(const void * fdt,int nodeoffset)78*14df9b24SMasahiro Yamada int fdt_size_cells(const void *fdt, int nodeoffset)
79*14df9b24SMasahiro Yamada {
80*14df9b24SMasahiro Yamada const fdt32_t *sc;
81*14df9b24SMasahiro Yamada int val;
82*14df9b24SMasahiro Yamada int len;
83*14df9b24SMasahiro Yamada
84*14df9b24SMasahiro Yamada sc = fdt_getprop(fdt, nodeoffset, "#size-cells", &len);
85*14df9b24SMasahiro Yamada if (!sc)
86*14df9b24SMasahiro Yamada return 2;
87*14df9b24SMasahiro Yamada
88*14df9b24SMasahiro Yamada if (len != sizeof(*sc))
89*14df9b24SMasahiro Yamada return -FDT_ERR_BADNCELLS;
90*14df9b24SMasahiro Yamada
91*14df9b24SMasahiro Yamada val = fdt32_to_cpu(*sc);
92*14df9b24SMasahiro Yamada if ((val < 0) || (val > FDT_MAX_NCELLS))
93*14df9b24SMasahiro Yamada return -FDT_ERR_BADNCELLS;
94*14df9b24SMasahiro Yamada
95*14df9b24SMasahiro Yamada return val;
96*14df9b24SMasahiro Yamada }
97