source: rtems/cpukit/dtc/libfdt/fdt_addresses.c @ ec2de39

Last change on this file since ec2de39 was ec2de39, checked in by Sebastian Huber <sebastian.huber@…>, on Jul 19, 2018 at 6:19:43 AM

libfdt: fdt_address_cells() and fdt_size_cells()

Add internal fdt_cells() to avoid copy and paste. Test error cases and
default values. Fix typo in fdt_size_cells() documentation comment.

Signed-off-by: Sebastian Huber <sebastian.huber@…>
Signed-off-by: David Gibson <david@…>

  • Property mode set to 100644
File size: 3.1 KB
Line 
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}
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