1/*
2 * libfdt - Flat Device Tree manipulation
3 * Copyright (C) 2006 David Gibson, IBM Corporation.
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
58int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
59			const void *val, int len)
60{
61	void *propval;
62	int proplen;
63
64	propval = fdt_getprop_w(fdt, nodeoffset, name, &proplen);
65	if (! propval)
66		return proplen;
67
68	if (proplen != len)
69		return -FDT_ERR_NOSPACE;
70
71	memcpy(propval, val, len);
72	return 0;
73}
74
75static void _fdt_nop_region(void *start, int len)
76{
77	uint32_t *p;
78
79	for (p = start; (char *)p < ((char *)start + len); p++)
80		*p = cpu_to_fdt32(FDT_NOP);
81}
82
83int fdt_nop_property(void *fdt, int nodeoffset, const char *name)
84{
85	struct fdt_property *prop;
86	int len;
87
88	prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
89	if (! prop)
90		return len;
91
92	_fdt_nop_region(prop, len + sizeof(*prop));
93
94	return 0;
95}
96
97int _fdt_node_end_offset(void *fdt, int offset)
98{
99	int depth = 0;
100
101	while ((offset >= 0) && (depth >= 0))
102		offset = fdt_next_node(fdt, offset, &depth);
103
104	return offset;
105}
106
107int fdt_nop_node(void *fdt, int nodeoffset)
108{
109	int endoffset;
110
111	endoffset = _fdt_node_end_offset(fdt, nodeoffset);
112	if (endoffset < 0)
113		return endoffset;
114
115	_fdt_nop_region(fdt_offset_ptr_w(fdt, nodeoffset, 0),
116			endoffset - nodeoffset);
117	return 0;
118}
119