1// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
2/*
3 * libfdt - Flat Device Tree manipulation
4 * Copyright (C) 2006 David Gibson, IBM Corporation.
5 */
6#include "libfdt_env.h"
7
8#include <fdt.h>
9#include <libfdt.h>
10
11#include "libfdt_internal.h"
12
13int fdt_setprop_inplace_namelen_partial(void *fdt, int nodeoffset,
14					const char *name, int namelen,
15					uint32_t idx, const void *val,
16					int len)
17{
18	void *propval;
19	int proplen;
20
21	propval = fdt_getprop_namelen_w(fdt, nodeoffset, name, namelen,
22					&proplen);
23	if (!propval)
24		return proplen;
25
26	if ((unsigned)proplen < (len + idx))
27		return -FDT_ERR_NOSPACE;
28
29	memcpy((char *)propval + idx, val, len);
30	return 0;
31}
32
33int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
34			const void *val, int len)
35{
36	const void *propval;
37	int proplen;
38
39	propval = fdt_getprop(fdt, nodeoffset, name, &proplen);
40	if (!propval)
41		return proplen;
42
43	if (proplen != len)
44		return -FDT_ERR_NOSPACE;
45
46	return fdt_setprop_inplace_namelen_partial(fdt, nodeoffset, name,
47						   strlen(name), 0,
48						   val, len);
49}
50
51static void fdt_nop_region_(void *start, int len)
52{
53	fdt32_t *p;
54
55	for (p = start; (char *)p < ((char *)start + len); p++)
56		*p = cpu_to_fdt32(FDT_NOP);
57}
58
59int fdt_nop_property(void *fdt, int nodeoffset, const char *name)
60{
61	struct fdt_property *prop;
62	int len;
63
64	prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
65	if (!prop)
66		return len;
67
68	fdt_nop_region_(prop, len + sizeof(*prop));
69
70	return 0;
71}
72
73int fdt_node_end_offset_(void *fdt, int offset)
74{
75	int depth = 0;
76
77	while ((offset >= 0) && (depth >= 0))
78		offset = fdt_next_node(fdt, offset, &depth);
79
80	return offset;
81}
82
83int fdt_nop_node(void *fdt, int nodeoffset)
84{
85	int endoffset;
86
87	endoffset = fdt_node_end_offset_(fdt, nodeoffset);
88	if (endoffset < 0)
89		return endoffset;
90
91	fdt_nop_region_(fdt_offset_ptr_w(fdt, nodeoffset, 0),
92			endoffset - nodeoffset);
93	return 0;
94}
95