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 #include <mach/init.h>
  11 #include <mach/sc-regs.h>
  12
  13 int ph1_ld4_early_clk_init(const struct uniphier_board_data *bd)
  14 {
  15         u32 tmp;
  16
  17         /* deassert reset */
  18         tmp = readl(SC_RSTCTRL);
  19
  20         tmp |= SC_RSTCTRL_NRST_UMC1 | SC_RSTCTRL_NRST_UMC0;
  21         if (spl_boot_device() != BOOT_DEVICE_NAND)
  22                 tmp &= ~SC_RSTCTRL_NRST_NAND;
  23         writel(tmp, SC_RSTCTRL);
  24         readl(SC_RSTCTRL); /* dummy read */
  25
  26         /* privide clocks */
  27         tmp = readl(SC_CLKCTRL);
  28         tmp |= SC_CLKCTRL_CEN_UMC | SC_CLKCTRL_CEN_SBC | SC_CLKCTRL_CEN_PERI;
  29         writel(tmp, SC_CLKCTRL);
  30         readl(SC_CLKCTRL); /* dummy read */
  31
  32         return 0;
  33 }