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_LD6B_UART_CLK		88888888
15 
16 unsigned int uniphier_ld6b_debug_uart_init(void)
17 {
18 	u32 tmp;
19 
20 	sg_set_iectrl(0);
21 	sg_set_pinsel(135, 3, 8, 4);	/* PORT10 -> TXD0 */
22 	sg_set_pinsel(115, 0, 8, 4);	/* TXD1 -> TXD1 */
23 	sg_set_pinsel(113, 2, 8, 4);	/* SBO0 -> TXD2 */
24 
25 	tmp = readl(SC_CLKCTRL);
26 	tmp |= SC_CLKCTRL_CEN_PERI;
27 	writel(tmp, SC_CLKCTRL);
28 
29 	return DIV_ROUND_CLOSEST(UNIPHIER_LD6B_UART_CLK, 16 * CONFIG_BAUDRATE);
30 }
31