summaryrefslogtreecommitdiffstats
path: root/commands/oftree.c
blob: 26a47bb5819bdffdc7b12221e6187b9e6402513a (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
/*
 * oftree.c - device tree command support
 *
 * Copyright (c) 2011 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
 *
 * based on U-Boot code by:
 *
 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
 * Pantelis Antoniou <pantelis.antoniou@gmail.com> and
 * Matthew McClintock <msm@freescale.com>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <common.h>
#include <environment.h>
#include <fdt.h>
#include <libfile.h>
#include <of.h>
#include <command.h>
#include <fs.h>
#include <malloc.h>
#include <linux/ctype.h>
#include <linux/err.h>
#include <asm/byteorder.h>
#include <errno.h>
#include <getopt.h>
#include <init.h>
#include <fcntl.h>
#include <complete.h>

static int do_oftree(int argc, char *argv[])
{
	struct fdt_header *fdt = NULL;
	size_t size;
	int opt;
	int probe = 0;
	char *load = NULL;
	char *save = NULL;
	int ret;
	struct device_node *root;

	while ((opt = getopt(argc, argv, "pfl:s:")) > 0) {
		switch (opt) {
		case 'l':
			load = optarg;
			break;
		case 'p':
			if (IS_ENABLED(CONFIG_OFDEVICE)) {
				probe = 1;
			} else {
				printf("oftree device probe support disabled\n");
				return COMMAND_ERROR_USAGE;
			}
			break;
		case 's':
			save = optarg;
			break;
		}
	}

	if (!probe && !load && !save)
		return COMMAND_ERROR_USAGE;

	if (save) {
		fdt = of_get_fixed_tree(NULL);
		if (!fdt) {
			printf("no devicetree available\n");
			ret = -EINVAL;

			goto out;
		}

		ret = write_file(save, fdt, fdt32_to_cpu(fdt->totalsize));

		goto out;
	}

	if (load) {
		fdt = read_file(load, &size);
		if (!fdt) {
			printf("unable to read %s\n", load);
			return 1;
		}

		root = of_unflatten_dtb(fdt);

		free(fdt);

		if (IS_ERR(root))
			return PTR_ERR(root);

		ret = of_set_root_node(root);
		if (ret) {
			printf("setting root node failed: %s\n", strerror(-ret));
			of_delete_node(root);
			goto out;
		}
	}

	if (probe) {
		ret = of_probe();
		if (ret)
			goto out;
	}

	ret = 0;
out:

	return ret;
}

BAREBOX_CMD_HELP_START(oftree)
BAREBOX_CMD_HELP_TEXT("Options:")
BAREBOX_CMD_HELP_OPT ("-l <DTB>",  "Load <DTB> to internal devicetree\n")
BAREBOX_CMD_HELP_OPT ("-s <DTB>",  "save internal devicetree to <DTB>\n")
BAREBOX_CMD_HELP_OPT ("-p",  "probe devices from stored device tree")
BAREBOX_CMD_HELP_END

BAREBOX_CMD_START(oftree)
	.cmd		= do_oftree,
	BAREBOX_CMD_DESC("handle device trees")
	BAREBOX_CMD_OPTS("[-lsp]")
	BAREBOX_CMD_GROUP(CMD_GRP_MISC)
	BAREBOX_CMD_HELP(cmd_oftree_help)
BAREBOX_CMD_END