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[u-boot] / arch / arm / mach-uniphier / debug-uart / debug-uart-ld20.c
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 }