[people/ms/u-boot.git] / arch / arm / mach-rockchip / rk_early_print.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);
}
Commit	Line	Data
07d8d35a	1	/*
	2	* (C) Copyright 2015 Rockchip Electronics Co., Ltd
	3	*
	4	* SPDX-License-Identifier: GPL-2.0+
	5	*/
	6
	7	#include <asm/io.h>
	8	#include <asm/arch/uart.h>
	9	#include <common.h>
	10
	11	static struct rk_uart *uart_ptr;
	12
	13	static void uart_wrtie_byte(char byte)
	14	{
	15	writel(byte, &uart_ptr->rbr);
	16	while (!(readl(&uart_ptr->lsr) & 0x40))
	17	;
	18	}
	19
	20	void print(char *s)
	21	{
	22	while (*s) {
	23	if (*s == '\n')
	24	uart_wrtie_byte('\r');
	25	uart_wrtie_byte(*s);
	26	s++;
	27	}
	28	}
	29
	30	void print_hex(unsigned int n)
	31	{
	32	int i;
	33	int temp;
	34
	35	uart_wrtie_byte('0');
	36	uart_wrtie_byte('x');
	37
	38	for (i = 8; i > 0; i--) {
	39	temp = (n >> (i - 1) * 4) & 0x0f;
	40	if (temp < 10)
	41	uart_wrtie_byte((char)(temp + '0'));
	42	else
	43	uart_wrtie_byte((char)(temp - 10 + 'a'));
	44	}
	45	uart_wrtie_byte('\n');
	46	uart_wrtie_byte('\r');
	47	}
	48
	49	/*
	50	* TODO: since rk3036 only 4K sram to use in SPL, for saving space,
	51	* we implement uart driver this way, we should convert this to use
	52	* ns16550 driver in future, which support DEBUG_UART in the standard way
	53	*/
	54	void rk_uart_init(void *base)
	55	{
	56	uart_ptr = (struct rk_uart *)base;
	57	writel(0x83, &uart_ptr->lcr);
	58	writel(0x0d, &uart_ptr->rbr);
	59	writel(0x03, &uart_ptr->lcr);
	60
	61	/* fifo enable, sfe is shadow register of FCR[0] */
	62	writel(0x01, &uart_ptr->sfe);
	63	}