LXR uboot/arch/arm/mach-uniphier/clk/clk-early-ld4.c

   1/*
   2 * Copyright (C) 2011-2014 Panasonic Corporation
   3 * Copyright (C) 2015-2017 Socionext Inc.
   4 *
   5 * SPDX-License-Identifier:     GPL-2.0+
   6 */
   7
   8#include <common.h>
   9#include <spl.h>
  10#include <linux/io.h>
  11
  12#include "../init.h"
  13#include "../sc-regs.h"
  14
  15void uniphier_ld4_early_clk_init(void)
  16{
  17        u32 tmp;
  18
  19        /* deassert reset */
  20        if (spl_boot_device() != BOOT_DEVICE_NAND) {
  21                tmp = readl(SC_RSTCTRL);
  22                tmp &= ~SC_RSTCTRL_NRST_NAND;
  23                writel(tmp, SC_RSTCTRL);
  24        };
  25
  26        /* provide clocks */
  27        tmp = readl(SC_CLKCTRL);
  28        tmp |= SC_CLKCTRL_CEN_SBC | SC_CLKCTRL_CEN_PERI;
  29        writel(tmp, SC_CLKCTRL);
  30        readl(SC_CLKCTRL); /* dummy read */
  31}
  32