fdt_wip.c revision 9537 
1/*
2 * libfdt - Flat Device Tree manipulation
3 * Copyright (C) 2006 David Gibson, IBM Corporation.
4 *
5 *     Redistribution and use in source and binary forms, with or
6 *     without modification, are permitted provided that the following
7 *     conditions are met:
8 *
9 *     1. Redistributions of source code must retain the above
10 *        copyright notice, this list of conditions and the following
11 *        disclaimer.
12 *     2. Redistributions in binary form must reproduce the above
13 *        copyright notice, this list of conditions and the following
14 *        disclaimer in the documentation and/or other materials
15 *        provided with the distribution.
16 *
17 *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
18 *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
19 *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
20 *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
22 *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25 *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
28 *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
29 *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31#include <fdt.h>
32#include <libfdt.h>
33
34#include "libfdt_env.h"
35#include "libfdt_internal.h"
36
37int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
38                        const void *val, int len)
39{
40        void *propval;
41        int proplen;
42
43        propval = fdt_getprop_w(fdt, nodeoffset, name, &proplen);
44        if (! propval)
45                return proplen;
46
47        if (proplen != len)
48                return -FDT_ERR_NOSPACE;
49
50        memcpy(propval, val, len);
51        return 0;
52}
53
54static void _fdt_nop_region(void *start, int len)
55{
56        fdt32_t *p;
57
58        for (p = start; (char *)p < ((char *)start + len); p++)
59                *p = cpu_to_fdt32(FDT_NOP);
60}
61
62int fdt_nop_property(void *fdt, int nodeoffset, const char *name)
63{
64        struct fdt_property *prop;
65        int len;
66
67        prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
68        if (! prop)
69                return len;
70
71        _fdt_nop_region(prop, len + sizeof(*prop));
72
73        return 0;
74}
75
76int _fdt_node_end_offset(void *fdt, int offset)
77{
78        int depth = 0;
79
80        while ((offset >= 0) && (depth >= 0))
81                offset = fdt_next_node(fdt, offset, &depth);
82
83        return offset;
84}
85
86int fdt_nop_node(void *fdt, int nodeoffset)
87{
88        int endoffset;
89
90        endoffset = _fdt_node_end_offset(fdt, nodeoffset);
91        if (endoffset < 0)
92                return endoffset;
93
94        _fdt_nop_region(fdt_offset_ptr_w(fdt, nodeoffset, 0),
95                        endoffset - nodeoffset);
96        return 0;
97}
98