mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-03 18:10:13 +00:00
64 lines
1.2 KiB
C
64 lines
1.2 KiB
C
|
/*
|
||
|
|
* (C) Copyright 2015 Rockchip Electronics Co., Ltd
|
||
|
|
*
|
||
|
|
* SPDX-License-Identifier: GPL-2.0+
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <asm/io.h>
|
||
|
|
#include <asm/arch/uart.h>
|
||
|
|
#include <common.h>
|
||
|
|
|
||
|
|
static struct rk_uart *uart_ptr;
|
||
|
|
|
||
|
|
static void uart_wrtie_byte(char byte)
|
||
|
|
{
|
||
|
|
writel(byte, &uart_ptr->rbr);
|
||
|
|
while (!(readl(&uart_ptr->lsr) & 0x40))
|
||
|
|
;
|
||
|
|
}
|
||
|
|
|
||
|
|
void print(char *s)
|
||
|
|
{
|
||
|
|
while (*s) {
|
||
|
|
if (*s == '\n')
|
||
|
|
uart_wrtie_byte('\r');
|
||
|
|
uart_wrtie_byte(*s);
|
||
|
|
s++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void print_hex(unsigned int n)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
int temp;
|
||
|
|
|
||
|
|
uart_wrtie_byte('0');
|
||
|
|
uart_wrtie_byte('x');
|
||
|
|
|
||
|
|
for (i = 8; i > 0; i--) {
|
||
|
|
temp = (n >> (i - 1) * 4) & 0x0f;
|
||
|
|
if (temp < 10)
|
||
|
|
uart_wrtie_byte((char)(temp + '0'));
|
||
|
|
else
|
||
|
|
uart_wrtie_byte((char)(temp - 10 + 'a'));
|
||
|
|
}
|
||
|
|
uart_wrtie_byte('\n');
|
||
|
|
uart_wrtie_byte('\r');
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* TODO: since rk3036 only 4K sram to use in SPL, for saving space,
|
||
|
|
* we implement uart driver this way, we should convert this to use
|
||
|
|
* ns16550 driver in future, which support DEBUG_UART in the standard way
|
||
|
|
*/
|
||
|
|
void rk_uart_init(void *base)
|
||
|
|
{
|
||
|
|
uart_ptr = (struct rk_uart *)base;
|
||
|
|
writel(0x83, &uart_ptr->lcr);
|
||
|
|
writel(0x0d, &uart_ptr->rbr);
|
||
|
|
writel(0x03, &uart_ptr->lcr);
|
||
|
|
|
||
|
|
/* fifo enable, sfe is shadow register of FCR[0] */
|
||
|
|
writel(0x01, &uart_ptr->sfe);
|
||
|
|
}
|