summaryrefslogtreecommitdiff
path: root/arch/arm/mach-uniphier/debug-uart/debug-uart-pro4.c
blob: 91998ec76e0f3daaaefe083953e9bff891d3fd1e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
/*
 * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <config.h>
#include <linux/kernel.h>
#include <linux/io.h>

#include "../sc-regs.h"
#include "../sg-regs.h"
#include "debug-uart.h"

#define UNIPHIER_PRO4_UART_CLK		73728000

unsigned int uniphier_pro4_debug_uart_init(void)
{
	u32 tmp;

	sg_set_iectrl(0);
	sg_set_pinsel(128, 0, 4, 8);	/* TXD0 -> TXD0 */

	writel(1, SG_LOADPINCTRL);

	tmp = readl(SC_CLKCTRL);
	tmp |= SC_CLKCTRL_CEN_PERI;
	writel(tmp, SC_CLKCTRL);

	return DIV_ROUND_CLOSEST(UNIPHIER_PRO4_UART_CLK, 16 * CONFIG_BAUDRATE);
}