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