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 "../sc64-regs.h"
12 #include "../sg-regs.h"
13 #include "debug-uart.h"
14 
15 #define UNIPHIER_LD20_UART_CLK		58820000
16 
17 unsigned int uniphier_ld20_debug_uart_init(void)
18 {
19 	u32 tmp;
20 
21 	sg_set_iectrl(54);		/* TXD0 */
22 	sg_set_iectrl(58);		/* TXD1 */
23 	sg_set_iectrl(90);		/* TXD2 */
24 	sg_set_iectrl(94);		/* TXD3 */
25 	sg_set_pinsel(54, 0, 8, 4);	/* TXD0 -> TXD0 */
26 	sg_set_pinsel(58, 1, 8, 4);	/* SPITXD1 -> TXD1 */
27 	sg_set_pinsel(90, 1, 8, 4);	/* PC0WE -> TXD2 */
28 	sg_set_pinsel(94, 1, 8, 4);	/* PCD00 -> TXD3 */
29 
30 	tmp = readl(SC_CLKCTRL4);
31 	tmp |= SC_CLKCTRL4_PERI;
32 	writel(tmp, SC_CLKCTRL4);
33 
34 	return DIV_ROUND_CLOSEST(UNIPHIER_LD20_UART_CLK, 16 * CONFIG_BAUDRATE);
35 }
36