u-boot/arch/arm/mach-uniphier/debug-uart/debug-uart-pro4.c

31 lines
616 B
C
Raw Normal View History

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
*/
#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);
}