common/common_fit.c

   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
  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  */
  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 }