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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 <linux/libfdt.h>
11 #include <spl.h>
12
13 ulong 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 /*
26  * Iterate over all /configurations subnodes and call a platform specific
27  * function to find the matching configuration.
28  * Returns the node offset or a negative error number.
29  */
30 int fit_find_config_node(const void *fdt)
31 {
32         const char *name;
33         int conf, node, len;
34         const char *dflt_conf_name;
35         const char *dflt_conf_desc = NULL;
36         int dflt_conf_node = -ENOENT;
37
38         conf = fdt_path_offset(fdt, FIT_CONFS_PATH);
39         if (conf < 0) {
40                 debug("%s: Cannot find /configurations node: %d\n", __func__,
41                       conf);
42                 return -EINVAL;
43         }
44
45         dflt_conf_name = fdt_getprop(fdt, conf, "default", &len);
46
47         for (node = fdt_first_subnode(fdt, conf);
48              node >= 0;
49              node = fdt_next_subnode(fdt, node)) {
50                 name = fdt_getprop(fdt, node, "description", &len);
51                 if (!name) {
52 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
53                         printf("%s: Missing FDT description in DTB\n",
54                                __func__);
55 #endif
56                         return -EINVAL;
57                 }
58
59                 if (dflt_conf_name) {
60                         const char *node_name = fdt_get_name(fdt, node, NULL);
61                         if (strcmp(dflt_conf_name, node_name) == 0) {
62                                 dflt_conf_node = node;
63                                 dflt_conf_desc = name;
64                         }
65                 }
66
67                 if (board_fit_config_name_match(name))
68                         continue;
69
70                 debug("Selecting config '%s'", name);
71
72                 return node;
73         }
74
75         if (dflt_conf_node != -ENOENT) {
76                 debug("Selecting default config '%s'", dflt_conf_desc);
77                 return dflt_conf_node;
78         }
79
80         return -ENOENT;
81 }