arch/arm/mach-uniphier/clk/clk-dram-ld4.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2011-2014 Panasonic Corporation
   4  * Copyright (C) 2015-2017 Socionext Inc.
   5  */
   6
   7 #include <common.h>
   8 #include <spl.h>
   9 #include <linux/io.h>
  10
  11 #include "../init.h"
  12 #include "../sc-regs.h"
  13
  14 void uniphier_ld4_dram_clk_init(void)
  15 {
  16         u32 tmp;
  17
  18         /* deassert reset */
  19         tmp = readl(SC_RSTCTRL);
  20         tmp |= SC_RSTCTRL_NRST_UMC1 | SC_RSTCTRL_NRST_UMC0;
  21         writel(tmp, SC_RSTCTRL);
  22         readl(SC_RSTCTRL); /* dummy read */
  23
  24         /* provide clocks */
  25         tmp = readl(SC_CLKCTRL);
  26         tmp |= SC_CLKCTRL_CEN_UMC;
  27         writel(tmp, SC_CLKCTRL);
  28         readl(SC_CLKCTRL); /* dummy read */
  29 }