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
fdt_getprop_u32(const void * fdt,int node,const char * prop)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 */
fit_find_config_node(const void * fdt)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'\n", name);
71
72 return node;
73 }
74
75 if (dflt_conf_node != -ENOENT) {
76 debug("Selecting default config '%s'\n", dflt_conf_desc);
77 return dflt_conf_node;
78 }
79
80 return -ENOENT;
81 }
82