LXR uboot/common/common

   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
  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;
  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}
  83