xref: /openbmc/u-boot/common/common_fit.c (revision 6f443330)
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 
fdt_getprop_u32(const void * fdt,int node,const char * prop)12 ulong fdt_getprop_u32(const void *fdt, int node, const char *prop)
13 {
14 	const u32 *cell;
15 	int len;
16 
17 	cell = fdt_getprop(fdt, node, prop, &len);
18 	if (!cell || len != sizeof(*cell))
19 		return FDT_ERROR;
20 
21 	return fdt32_to_cpu(*cell);
22 }
23 
24 /*
25  * Iterate over all /configurations subnodes and call a platform specific
26  * function to find the matching configuration.
27  * Returns the node offset or a negative error number.
28  */
fit_find_config_node(const void * fdt)29 int fit_find_config_node(const void *fdt)
30 {
31 	const char *name;
32 	int conf, node, len;
33 	const char *dflt_conf_name;
34 	const char *dflt_conf_desc = NULL;
35 	int dflt_conf_node = -ENOENT;
36 
37 	conf = fdt_path_offset(fdt, FIT_CONFS_PATH);
38 	if (conf < 0) {
39 		debug("%s: Cannot find /configurations node: %d\n", __func__,
40 		      conf);
41 		return -EINVAL;
42 	}
43 
44 	dflt_conf_name = fdt_getprop(fdt, conf, "default", &len);
45 
46 	for (node = fdt_first_subnode(fdt, conf);
47 	     node >= 0;
48 	     node = fdt_next_subnode(fdt, node)) {
49 		name = fdt_getprop(fdt, node, "description", &len);
50 		if (!name) {
51 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
52 			printf("%s: Missing FDT description in DTB\n",
53 			       __func__);
54 #endif
55 			return -EINVAL;
56 		}
57 
58 		if (dflt_conf_name) {
59 			const char *node_name = fdt_get_name(fdt, node, NULL);
60 			if (strcmp(dflt_conf_name, node_name) == 0) {
61 				dflt_conf_node = node;
62 				dflt_conf_desc = name;
63 			}
64 		}
65 
66 		if (board_fit_config_name_match(name))
67 			continue;
68 
69 		debug("Selecting config '%s'", name);
70 
71 		return node;
72 	}
73 
74 	if (dflt_conf_node != -ENOENT) {
75 		debug("Selecting default config '%s'\n", dflt_conf_desc);
76 		return dflt_conf_node;
77 	}
78 
79 	return -ENOENT;
80 }
81