git.sur5r.net Git - u-boot/blob - arch/arm/mach-uniphier/early-clk/early-clk-proxstream2.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 #include <mach/init.h>
  11 #include <mach/sc-regs.h>
  12
  13 int proxstream2_early_clk_init(const struct uniphier_board_data *bd)
  14 {
  15         u32 tmp;
  16
  17         /* deassert reset */
  18         if (spl_boot_device() != BOOT_DEVICE_NAND) {
  19                 tmp = readl(SC_RSTCTRL);
  20                 tmp &= ~SC_RSTCTRL_NRST_NAND;
  21                 writel(tmp, SC_RSTCTRL);
  22         };
  23
  24         tmp = readl(SC_RSTCTRL4);
  25         tmp |= SC_RSTCTRL4_NRST_UMCSB | SC_RSTCTRL4_NRST_UMCA2 |
  26                SC_RSTCTRL4_NRST_UMCA1 | SC_RSTCTRL4_NRST_UMCA0 |
  27                SC_RSTCTRL4_NRST_UMC32 | SC_RSTCTRL4_NRST_UMC31 |
  28                SC_RSTCTRL4_NRST_UMC30;
  29         writel(tmp, SC_RSTCTRL4);
  30         readl(SC_RSTCTRL4); /* dummy read */
  31
  32         /* privide clocks */
  33         tmp = readl(SC_CLKCTRL);
  34         tmp |= SC_CLKCTRL_CEN_SBC | SC_CLKCTRL_CEN_PERI;
  35         writel(tmp, SC_CLKCTRL);
  36
  37         tmp = readl(SC_CLKCTRL4);
  38         tmp |= SC_CLKCTRL4_CEN_UMCSB | SC_CLKCTRL4_CEN_UMC2 |
  39                SC_CLKCTRL4_CEN_UMC1 | SC_CLKCTRL4_CEN_UMC0;
  40         writel(tmp, SC_CLKCTRL4);
  41         readl(SC_CLKCTRL4); /* dummy read */
  42
  43         return 0;
  44 }