LXR uboot/board/google/gru/gru.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright 2018 Google
   4 */
   5
   6#include <common.h>
   7#include <dm.h>
   8#include <init.h>
   9
  10#ifdef CONFIG_SPL_BUILD
  11/* provided to defeat compiler optimisation in board_init_f() */
  12void gru_dummy_function(int i)
  13{
  14}
  15
  16int board_early_init_f(void)
  17{
  18# ifdef CONFIG_TARGET_CHROMEBOOK_BOB
  19        int sum, i;
  20
  21        /*
  22         * Add a delay and ensure that the compiler does not optimise this out.
  23         * This is needed since the power rails tail a while to turn on, and
  24         * we get garbage serial output otherwise.
  25         */
  26        sum = 0;
  27        for (i = 0; i < 150000; i++)
  28                sum += i;
  29        gru_dummy_function(sum);
  30#endif /* CONFIG_TARGET_CHROMEBOOK_BOB */
  31
  32        return 0;
  33}
  34#endif
  35
  36#ifndef CONFIG_SPL_BUILD
  37int board_early_init_r(void)
  38{
  39        struct udevice *clk;
  40        int ret;
  41
  42        /*
  43         * This init is done in SPL, but when chain-loading U-Boot SPL will
  44         * have been skipped. Allow the clock driver to check if it needs
  45         * setting up.
  46         */
  47        ret = uclass_get_device_by_driver(UCLASS_CLK,
  48                                          DM_DRIVER_GET(clk_rk3399), &clk);
  49        if (ret) {
  50                debug("%s: CLK init failed: %d\n", __func__, ret);
  51                return ret;
  52        }
  53
  54        return 0;
  55}
  56#endif
  57