LXR linux/arch/nios2/kernel/prom.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Device tree support
   4 *
   5 * Copyright (C) 2013, 2015 Altera Corporation
   6 * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
   7 *
   8 * Based on MIPS support for CONFIG_OF device tree support
   9 *
  10 * Copyright (C) 2010 Cisco Systems Inc. <dediao@cisco.com>
  11 */
  12
  13#include <linux/init.h>
  14#include <linux/types.h>
  15#include <linux/memblock.h>
  16#include <linux/of.h>
  17#include <linux/of_fdt.h>
  18#include <linux/io.h>
  19
  20#include <asm/sections.h>
  21
  22void __init early_init_devtree(void *params)
  23{
  24        __be32 *dtb = (u32 *)__dtb_start;
  25#if defined(CONFIG_NIOS2_DTB_AT_PHYS_ADDR)
  26        if (be32_to_cpup((__be32 *)CONFIG_NIOS2_DTB_PHYS_ADDR) ==
  27                 OF_DT_HEADER) {
  28                params = (void *)CONFIG_NIOS2_DTB_PHYS_ADDR;
  29                early_init_dt_scan(params);
  30                return;
  31        }
  32#endif
  33        if (be32_to_cpu((__be32) *dtb) == OF_DT_HEADER)
  34                params = (void *)__dtb_start;
  35
  36        early_init_dt_scan(params);
  37}
  38