text: // SPDX-License-Identifier: GPL-2.0+
  /*
   * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
   */
  
  #include <config.h>
  #include <linux/kernel.h>
  #include <linux/io.h>
  
  #include "../sc64-regs.h"
  #include "../sg-regs.h"
  #include "debug-uart.h"
  
  #define UNIPHIER_LD20_UART_CLK		58820000
  
  unsigned int uniphier_ld20_debug_uart_init(void)
  {
  	u32 tmp;
  
  	sg_set_iectrl(54);		/* TXD0 */
  	sg_set_iectrl(58);		/* TXD1 */
  	sg_set_iectrl(90);		/* TXD2 */
  	sg_set_iectrl(94);		/* TXD3 */
  	sg_set_pinsel(54, 0, 8, 4);	/* TXD0 -> TXD0 */
  	sg_set_pinsel(58, 1, 8, 4);	/* SPITXD1 -> TXD1 */
  	sg_set_pinsel(90, 1, 8, 4);	/* PC0WE -> TXD2 */
  	sg_set_pinsel(94, 1, 8, 4);	/* PCD00 -> TXD3 */
  
  	tmp = readl(SC_CLKCTRL4);
  	tmp |= SC_CLKCTRL4_PERI;
  	writel(tmp, SC_CLKCTRL4);
  
  	return DIV_ROUND_CLOSEST(UNIPHIER_LD20_UART_CLK, 16 * CONFIG_BAUDRATE);
  }
  