arch/arm/mach-uniphier/clk/clk-dram-pxs2.c

   1 /*
   2  * Copyright (C) 2016-2017 Socionext Inc.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   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_pxs2_dram_clk_init(void)
  15 {
  16         u32 tmp;
  17
  18         /* deassert reset */
  19         tmp = readl(SC_RSTCTRL4);
  20         tmp |= SC_RSTCTRL4_NRST_UMCSB | SC_RSTCTRL4_NRST_UMCA2 |
  21                SC_RSTCTRL4_NRST_UMCA1 | SC_RSTCTRL4_NRST_UMCA0 |
  22                SC_RSTCTRL4_NRST_UMC32 | SC_RSTCTRL4_NRST_UMC31 |
  23                SC_RSTCTRL4_NRST_UMC30;
  24         writel(tmp, SC_RSTCTRL4);
  25         readl(SC_RSTCTRL4); /* dummy read */
  26
  27         /* provide clocks */
  28         tmp = readl(SC_CLKCTRL4);
  29         tmp |= SC_CLKCTRL4_CEN_UMCSB | SC_CLKCTRL4_CEN_UMC2 |
  30                SC_CLKCTRL4_CEN_UMC1 | SC_CLKCTRL4_CEN_UMC0;
  31         writel(tmp, SC_CLKCTRL4);
  32         readl(SC_CLKCTRL4); /* dummy read */
  33 }