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