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
board_fit_config_name_match(const char * name)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 */
fit_find_config_node(const void * fdt)35 int 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