1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
4  */
5 
6 #include <config.h>
7 #include <linux/kernel.h>
8 #include <linux/io.h>
9 
10 #include "../sc-regs.h"
11 #include "../sg-regs.h"
12 #include "debug-uart.h"
13 
14 #define UNIPHIER_PRO4_UART_CLK		73728000
15 
16 unsigned int uniphier_pro4_debug_uart_init(void)
17 {
18 	u32 tmp;
19 
20 	sg_set_iectrl(0);
21 	sg_set_pinsel(128, 0, 4, 8);	/* TXD0 -> TXD0 */
22 
23 	writel(1, SG_LOADPINCTRL);
24 
25 	tmp = readl(SC_CLKCTRL);
26 	tmp |= SC_CLKCTRL_CEN_PERI;
27 	writel(tmp, SC_CLKCTRL);
28 
29 	return DIV_ROUND_CLOSEST(UNIPHIER_PRO4_UART_CLK, 16 * CONFIG_BAUDRATE);
30 }
31