arch/arm/mach-uniphier/clk/clk-dram-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
  15 void uniphier_ld4_dram_clk_init(void)
  16 {
  17         u32 tmp;
  18
  19         /* deassert reset */
  20         tmp = readl(SC_RSTCTRL);
  21         tmp |= SC_RSTCTRL_NRST_UMC1 | SC_RSTCTRL_NRST_UMC0;
  22         writel(tmp, SC_RSTCTRL);
  23         readl(SC_RSTCTRL); /* dummy read */
  24
  25         /* provide clocks */
  26         tmp = readl(SC_CLKCTRL);
  27         tmp |= SC_CLKCTRL_CEN_UMC;
  28         writel(tmp, SC_CLKCTRL);
  29         readl(SC_CLKCTRL); /* dummy read */
  30 }