1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2016 Google, Inc
4 * Written by Simon Glass <sjg@chromium.org>
5 */
6
7#include <common.h>
8#include <errno.h>
9#include <image.h>
10#include <log.h>
11#include <linux/libfdt.h>
12
13ulong fdt_getprop_u32(const void *fdt, int node, const char *prop)
14{
15	const u32 *cell;
16	int len;
17
18	cell = fdt_getprop(fdt, node, prop, &len);
19	if (!cell || len != sizeof(*cell))
20		return FDT_ERROR;
21
22	return fdt32_to_cpu(*cell);
23}
24
25__weak int board_fit_config_name_match(const char *name)
26{
27	return -EINVAL;
28}
29
30/*
31 * Iterate over all /configurations subnodes and call a platform specific
32 * function to find the matching configuration.
33 * Returns the node offset or a negative error number.
34 */
35int fit_find_config_node(const void *fdt)
36{
37	const char *name;
38	int conf, node, len;
39	const char *dflt_conf_name;
40	const char *dflt_conf_desc = NULL;
41	int dflt_conf_node = -ENOENT;
42
43	conf = fdt_path_offset(fdt, FIT_CONFS_PATH);
44	if (conf < 0) {
45		debug("%s: Cannot find /configurations node: %d\n", __func__,
46		      conf);
47		return -EINVAL;
48	}
49
50	dflt_conf_name = fdt_getprop(fdt, conf, "default", &len);
51
52	for (node = fdt_first_subnode(fdt, conf);
53	     node >= 0;
54	     node = fdt_next_subnode(fdt, node)) {
55		name = fdt_getprop(fdt, node, "description", &len);
56		if (!name) {
57#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
58			printf("%s: Missing FDT description in DTB\n",
59			       __func__);
60#endif
61			return -EINVAL;
62		}
63
64		if (dflt_conf_name) {
65			const char *node_name = fdt_get_name(fdt, node, NULL);
66			if (strcmp(dflt_conf_name, node_name) == 0) {
67				dflt_conf_node = node;
68				dflt_conf_desc = name;
69			}
70		}
71
72		if (board_fit_config_name_match(name))
73			continue;
74
75		debug("Selecting config '%s'\n", name);
76
77		return node;
78	}
79
80	if (dflt_conf_node != -ENOENT) {
81		debug("Selecting default config '%s'\n", dflt_conf_desc);
82		return dflt_conf_node;
83	}
84
85	return -ENOENT;
86}
87