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

   1 /*
   2  * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.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 uniphier_pxs2_early_clk_init(const struct uniphier_board_data *bd)
  15 {
  16         u32 tmp;
  17
  18         /* deassert reset */
  19         if (spl_boot_device() != BOOT_DEVICE_NAND) {
  20                 tmp = readl(SC_RSTCTRL);
  21                 tmp &= ~SC_RSTCTRL_NRST_NAND;
  22                 writel(tmp, SC_RSTCTRL);
  23         };
  24
  25         tmp = readl(SC_RSTCTRL4);
  26         tmp |= SC_RSTCTRL4_NRST_UMCSB | SC_RSTCTRL4_NRST_UMCA2 |
  27                SC_RSTCTRL4_NRST_UMCA1 | SC_RSTCTRL4_NRST_UMCA0 |
  28                SC_RSTCTRL4_NRST_UMC32 | SC_RSTCTRL4_NRST_UMC31 |
  29                SC_RSTCTRL4_NRST_UMC30;
  30         writel(tmp, SC_RSTCTRL4);
  31         readl(SC_RSTCTRL4); /* dummy read */
  32
  33         /* provide clocks */
  34         tmp = readl(SC_CLKCTRL);
  35         tmp |= SC_CLKCTRL_CEN_SBC | SC_CLKCTRL_CEN_PERI;
  36         writel(tmp, SC_CLKCTRL);
  37
  38         tmp = readl(SC_CLKCTRL4);
  39         tmp |= SC_CLKCTRL4_CEN_UMCSB | SC_CLKCTRL4_CEN_UMC2 |
  40                SC_CLKCTRL4_CEN_UMC1 | SC_CLKCTRL4_CEN_UMC0;
  41         writel(tmp, SC_CLKCTRL4);
  42         readl(SC_CLKCTRL4); /* dummy read */
  43
  44         return 0;
  45 }