1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright (C) 2016 Google, Inc
3*4882a593Smuzhiyun * Written by Simon Glass <sjg@chromium.org>
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <common.h>
9*4882a593Smuzhiyun #include <errno.h>
10*4882a593Smuzhiyun #include <image.h>
11*4882a593Smuzhiyun #include <linux/libfdt.h>
12*4882a593Smuzhiyun #include <spl.h>
13*4882a593Smuzhiyun
fdt_getprop_u32(const void * fdt,int node,const char * prop)14*4882a593Smuzhiyun ulong fdt_getprop_u32(const void *fdt, int node, const char *prop)
15*4882a593Smuzhiyun {
16*4882a593Smuzhiyun const u32 *cell;
17*4882a593Smuzhiyun int len;
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun cell = fdt_getprop(fdt, node, prop, &len);
20*4882a593Smuzhiyun if (!cell || len != sizeof(*cell))
21*4882a593Smuzhiyun return FDT_ERROR;
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun return fdt32_to_cpu(*cell);
24*4882a593Smuzhiyun }
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun /*
27*4882a593Smuzhiyun * Iterate over all /configurations subnodes and call a platform specific
28*4882a593Smuzhiyun * function to find the matching configuration.
29*4882a593Smuzhiyun * Returns the node offset or a negative error number.
30*4882a593Smuzhiyun */
fit_find_config_node(const void * fdt)31*4882a593Smuzhiyun int fit_find_config_node(const void *fdt)
32*4882a593Smuzhiyun {
33*4882a593Smuzhiyun const char *name;
34*4882a593Smuzhiyun int conf, node, len;
35*4882a593Smuzhiyun const char *dflt_conf_name;
36*4882a593Smuzhiyun const char *dflt_conf_desc = NULL;
37*4882a593Smuzhiyun int dflt_conf_node = -ENOENT;
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun conf = fdt_path_offset(fdt, FIT_CONFS_PATH);
40*4882a593Smuzhiyun if (conf < 0) {
41*4882a593Smuzhiyun debug("%s: Cannot find /configurations node: %d\n", __func__,
42*4882a593Smuzhiyun conf);
43*4882a593Smuzhiyun return -EINVAL;
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun dflt_conf_name = fdt_getprop(fdt, conf, "default", &len);
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun for (node = fdt_first_subnode(fdt, conf);
49*4882a593Smuzhiyun node >= 0;
50*4882a593Smuzhiyun node = fdt_next_subnode(fdt, node)) {
51*4882a593Smuzhiyun name = fdt_getprop(fdt, node, "description", &len);
52*4882a593Smuzhiyun if (!name) {
53*4882a593Smuzhiyun #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
54*4882a593Smuzhiyun printf("%s: Missing FDT description in DTB\n",
55*4882a593Smuzhiyun __func__);
56*4882a593Smuzhiyun #endif
57*4882a593Smuzhiyun return -EINVAL;
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun if (dflt_conf_name) {
61*4882a593Smuzhiyun const char *node_name = fdt_get_name(fdt, node, NULL);
62*4882a593Smuzhiyun if (strcmp(dflt_conf_name, node_name) == 0) {
63*4882a593Smuzhiyun dflt_conf_node = node;
64*4882a593Smuzhiyun dflt_conf_desc = name;
65*4882a593Smuzhiyun }
66*4882a593Smuzhiyun }
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun if (board_fit_config_name_match(name))
69*4882a593Smuzhiyun continue;
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun debug("Selecting config '%s'", name);
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun return node;
74*4882a593Smuzhiyun }
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun if (dflt_conf_node != -ENOENT) {
77*4882a593Smuzhiyun debug("Selecting default config '%s'", dflt_conf_desc);
78*4882a593Smuzhiyun return dflt_conf_node;
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun return -ENOENT;
82*4882a593Smuzhiyun }
83