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Cooper Jr., Franklin3863f842017-06-16 17:25:05 -05001/*
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>
Masahiro Yamadab08c8c42018-03-05 01:20:11 +090011#include <linux/libfdt.h>
Cooper Jr., Franklin3863f842017-06-16 17:25:05 -050012#include <spl.h>
13
14ulong 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 */
31int fit_find_config_node(const void *fdt)
32{
33 const char *name;
34 int conf, node, len;
Jean-Jacques Hiblot02035d02017-09-15 12:57:27 +020035 const char *dflt_conf_name;
36 const char *dflt_conf_desc = NULL;
37 int dflt_conf_node = -ENOENT;
Cooper Jr., Franklin3863f842017-06-16 17:25:05 -050038
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 }
Jean-Jacques Hiblot02035d02017-09-15 12:57:27 +020045
46 dflt_conf_name = fdt_getprop(fdt, conf, "default", &len);
47
Cooper Jr., Franklin3863f842017-06-16 17:25:05 -050048 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 }
Jean-Jacques Hiblot02035d02017-09-15 12:57:27 +020059
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
Cooper Jr., Franklin3863f842017-06-16 17:25:05 -050068 if (board_fit_config_name_match(name))
69 continue;
70
71 debug("Selecting config '%s'", name);
72
73 return node;
74 }
75
Jean-Jacques Hiblot02035d02017-09-15 12:57:27 +020076 if (dflt_conf_node != -ENOENT) {
77 debug("Selecting default config '%s'", dflt_conf_desc);
78 return dflt_conf_node;
79 }
80
Cooper Jr., Franklin3863f842017-06-16 17:25:05 -050081 return -ENOENT;
82}