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3863f840 CJF |
1 | /* |
2 | * Copyright (C) 2016 Google, Inc | |
3 | * Written by Simon Glass <sjg@chromium.org> | |
4 | * | |
5 | * SPDX-License-Identifier: GPL-2.0+ | |
6 | */ | |
7 | ||
8 | #include <common.h> | |
9 | #include <errno.h> | |
10 | #include <image.h> | |
11 | #include <libfdt.h> | |
12 | #include <spl.h> | |
13 | ||
14 | ulong fdt_getprop_u32(const void *fdt, int node, const char *prop) | |
15 | { | |
16 | const u32 *cell; | |
17 | int len; | |
18 | ||
19 | cell = fdt_getprop(fdt, node, prop, &len); | |
20 | if (!cell || len != sizeof(*cell)) | |
21 | return FDT_ERROR; | |
22 | ||
23 | return fdt32_to_cpu(*cell); | |
24 | } | |
25 | ||
26 | /* | |
27 | * Iterate over all /configurations subnodes and call a platform specific | |
28 | * function to find the matching configuration. | |
29 | * Returns the node offset or a negative error number. | |
30 | */ | |
31 | int fit_find_config_node(const void *fdt) | |
32 | { | |
33 | const char *name; | |
34 | int conf, node, len; | |
02035d00 JJH |
35 | const char *dflt_conf_name; |
36 | const char *dflt_conf_desc = NULL; | |
37 | int dflt_conf_node = -ENOENT; | |
3863f840 CJF |
38 | |
39 | conf = fdt_path_offset(fdt, FIT_CONFS_PATH); | |
40 | if (conf < 0) { | |
41 | debug("%s: Cannot find /configurations node: %d\n", __func__, | |
42 | conf); | |
43 | return -EINVAL; | |
44 | } | |
02035d00 JJH |
45 | |
46 | dflt_conf_name = fdt_getprop(fdt, conf, "default", &len); | |
47 | ||
3863f840 CJF |
48 | for (node = fdt_first_subnode(fdt, conf); |
49 | node >= 0; | |
50 | node = fdt_next_subnode(fdt, node)) { | |
51 | name = fdt_getprop(fdt, node, "description", &len); | |
52 | if (!name) { | |
53 | #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT | |
54 | printf("%s: Missing FDT description in DTB\n", | |
55 | __func__); | |
56 | #endif | |
57 | return -EINVAL; | |
58 | } | |
02035d00 JJH |
59 | |
60 | if (dflt_conf_name) { | |
61 | const char *node_name = fdt_get_name(fdt, node, NULL); | |
62 | if (strcmp(dflt_conf_name, node_name) == 0) { | |
63 | dflt_conf_node = node; | |
64 | dflt_conf_desc = name; | |
65 | } | |
66 | } | |
67 | ||
3863f840 CJF |
68 | if (board_fit_config_name_match(name)) |
69 | continue; | |
70 | ||
71 | debug("Selecting config '%s'", name); | |
72 | ||
73 | return node; | |
74 | } | |
75 | ||
02035d00 JJH |
76 | if (dflt_conf_node != -ENOENT) { |
77 | debug("Selecting default config '%s'", dflt_conf_desc); | |
78 | return dflt_conf_node; | |
79 | } | |
80 | ||
3863f840 CJF |
81 | return -ENOENT; |
82 | } |