xref: /openbmc/u-boot/common/common_fit.c (revision 48263504)
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 }
83