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

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2016-2017 Socionext Inc.
   4  */
   5
   6 #include <common.h>
   7 #include <spl.h>
   8 #include <linux/io.h>
   9
  10 #include "../init.h"
  11 #include "../sc-regs.h"
  12
  13 void uniphier_pxs2_dram_clk_init(void)
  14 {
  15         u32 tmp;
  16
  17         /* deassert reset */
  18         tmp = readl(sc_base + SC_RSTCTRL4);
  19         tmp |= SC_RSTCTRL4_NRST_UMCSB | SC_RSTCTRL4_NRST_UMCA2 |
  20                SC_RSTCTRL4_NRST_UMCA1 | SC_RSTCTRL4_NRST_UMCA0 |
  21                SC_RSTCTRL4_NRST_UMC32 | SC_RSTCTRL4_NRST_UMC31 |
  22                SC_RSTCTRL4_NRST_UMC30;
  23         writel(tmp, sc_base + SC_RSTCTRL4);
  24         readl(sc_base + SC_RSTCTRL4); /* dummy read */
  25
  26         /* provide clocks */
  27         tmp = readl(sc_base + SC_CLKCTRL4);
  28         tmp |= SC_CLKCTRL4_CEN_UMCSB | SC_CLKCTRL4_CEN_UMC2 |
  29                SC_CLKCTRL4_CEN_UMC1 | SC_CLKCTRL4_CEN_UMC0;
  30         writel(tmp, sc_base + SC_CLKCTRL4);
  31         readl(sc_base + SC_CLKCTRL4); /* dummy read */
  32 }