LXR uboot/common/common

   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
  13ulong 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__weak int board_fit_config_name_match(const char *name)
  26{
  27        return -EINVAL;
  28}
  29
  30/*
  31 * Iterate over all /configurations subnodes and call a platform specific
  32 * function to find the matching configuration.
  33 * Returns the node offset or a negative error number.
  34 */
  35int fit_find_config_node(const void *fdt)
  36{
  37        const char *name;
  38        int conf, node, len;
  39        const char *dflt_conf_name;
  40        const char *dflt_conf_desc = NULL;
  41        int dflt_conf_node = -ENOENT;
  42
  43        conf = fdt_path_offset(fdt, FIT_CONFS_PATH);
  44        if (conf < 0) {
  45                debug("%s: Cannot find /configurations node: %d\n", __func__,
  46                      conf);
  47                return -EINVAL;
  48        }
  49
  50        dflt_conf_name = fdt_getprop(fdt, conf, "default", &len);
  51
  52        for (node = fdt_first_subnode(fdt, conf);
  53             node >= 0;
  54             node = fdt_next_subnode(fdt, node)) {
  55                name = fdt_getprop(fdt, node, "description", &len);
  56                if (!name) {
  57#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
  58                        printf("%s: Missing FDT description in DTB\n",
  59                               __func__);
  60#endif
  61                        return -EINVAL;
  62                }
  63
  64                if (dflt_conf_name) {
  65                        const char *node_name = fdt_get_name(fdt, node, NULL);
  66                        if (strcmp(dflt_conf_name, node_name) == 0) {
  67                                dflt_conf_node = node;
  68                                dflt_conf_desc = name;
  69                        }
  70                }
  71
  72                if (board_fit_config_name_match(name))
  73                        continue;
  74
  75                debug("Selecting config '%s'\n", name);
  76
  77                return node;
  78        }
  79
  80        if (dflt_conf_node != -ENOENT) {
  81                debug("Selecting default config '%s'\n", dflt_conf_desc);
  82                return dflt_conf_node;
  83        }
  84
  85        return -ENOENT;
  86}
  87