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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;
35         const char *dflt_conf_name;
36         const char *dflt_conf_desc = NULL;
37         int dflt_conf_node = -ENOENT;
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         }
45
46         dflt_conf_name = fdt_getprop(fdt, conf, "default", &len);
47
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                 }
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
68                 if (board_fit_config_name_match(name))
69                         continue;
70
71                 debug("Selecting config '%s'", name);
72
73                 return node;
74         }
75
76         if (dflt_conf_node != -ENOENT) {
77                 debug("Selecting default config '%s'", dflt_conf_desc);
78                 return dflt_conf_node;
79         }
80
81         return -ENOENT;
82 }