arch/arm/mach-uniphier/early-clk/early-clk-ph1-ld4.c

   1 /*
   2  * Copyright (C) 2011-2015 Masahiro Yamada <yamada.m@jp.panasonic.com>
   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 int ph1_ld4_early_clk_init(const struct uniphier_board_data *bd)
  15 {
  16         u32 tmp;
  17
  18         /* deassert reset */
  19         tmp = readl(SC_RSTCTRL);
  20
  21         tmp |= SC_RSTCTRL_NRST_UMC1 | SC_RSTCTRL_NRST_UMC0;
  22         if (spl_boot_device() != BOOT_DEVICE_NAND)
  23                 tmp &= ~SC_RSTCTRL_NRST_NAND;
  24         writel(tmp, SC_RSTCTRL);
  25         readl(SC_RSTCTRL); /* dummy read */
  26
  27         /* privide clocks */
  28         tmp = readl(SC_CLKCTRL);
  29         tmp |= SC_CLKCTRL_CEN_UMC | SC_CLKCTRL_CEN_SBC | SC_CLKCTRL_CEN_PERI;
  30         writel(tmp, SC_CLKCTRL);
  31         readl(SC_CLKCTRL); /* dummy read */
  32
  33         return 0;
  34 }