arch/arm/mach-uniphier/debug-uart/debug-uart-sld3.c

   1 /*
   2  * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <config.h>
   8 #include <linux/kernel.h>
   9 #include <linux/io.h>
  10
  11 #include "../bcu/bcu-regs.h"
  12 #include "../sc-regs.h"
  13 #include "../sg-regs.h"
  14 #include "debug-uart.h"
  15
  16 #define UNIPHIER_SLD3_UART_CLK          36864000
  17
  18 unsigned int uniphier_sld3_debug_uart_init(void)
  19 {
  20         u32 tmp;
  21
  22         sg_set_pinsel(64, 1, 4, 4);     /* TXD0 -> TXD0 */
  23
  24         writel(0x24440000, BCSCR5);
  25
  26         tmp = readl(SC_CLKCTRL);
  27         tmp |= SC_CLKCTRL_CEN_PERI;
  28         writel(tmp, SC_CLKCTRL);
  29
  30         return DIV_ROUND_CLOSEST(UNIPHIER_SLD3_UART_CLK, 16 * CONFIG_BAUDRATE);
  31 }