blob: 0d6629918acc84e693ec3c0810ec523597f5c40f [file] [log] [blame]
Tom Rini10e47792018-05-06 17:58:06 -04001// SPDX-License-Identifier: GPL-2.0+
Masahiro Yamada52f0c512016-03-18 16:41:52 +09002/*
3 * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
Masahiro Yamada52f0c512016-03-18 16:41:52 +09004 */
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
16unsigned 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}