common/common_fit.c

   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 }