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 <spl.h>
   7 #include <linux/io.h>
   8
   9 #include "../init.h"
  10 #include "../sc-regs.h"
  11
  12 void uniphier_pxs2_dram_clk_init(void)
  13 {
  14         u32 tmp;
  15
  16         /* deassert reset */
  17         tmp = readl(sc_base + SC_RSTCTRL4);
  18         tmp |= SC_RSTCTRL4_NRST_UMCSB | SC_RSTCTRL4_NRST_UMCA2 |
  19                SC_RSTCTRL4_NRST_UMCA1 | SC_RSTCTRL4_NRST_UMCA0 |
  20                SC_RSTCTRL4_NRST_UMC32 | SC_RSTCTRL4_NRST_UMC31 |
  21                SC_RSTCTRL4_NRST_UMC30;
  22         writel(tmp, sc_base + SC_RSTCTRL4);
  23         readl(sc_base + SC_RSTCTRL4); /* dummy read */
  24
  25         /* provide clocks */
  26         tmp = readl(sc_base + SC_CLKCTRL4);
  27         tmp |= SC_CLKCTRL4_CEN_UMCSB | SC_CLKCTRL4_CEN_UMC2 |
  28                SC_CLKCTRL4_CEN_UMC1 | SC_CLKCTRL4_CEN_UMC0;
  29         writel(tmp, sc_base + SC_CLKCTRL4);
  30         readl(sc_base + SC_CLKCTRL4); /* dummy read */
  31 }