Contributors: 4
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Wu Zhangjin |
135 |
94.41% |
4 |
57.14% |
| Alexander Sverdlin |
3 |
2.10% |
1 |
14.29% |
| Huacai Chen |
3 |
2.10% |
1 |
14.29% |
| Thomas Gleixner |
2 |
1.40% |
1 |
14.29% |
| Total |
143 |
|
7 |
|
// SPDX-License-Identifier: GPL-2.0-or-later
/* early printk support
*
* Copyright (c) 2009 Philippe Vachon <philippe@cowpig.ca>
* Copyright (c) 2009 Lemote Inc.
* Author: Wu Zhangjin, wuzhangjin@gmail.com
*/
#include <linux/serial_reg.h>
#include <asm/setup.h>
#include <loongson.h>
#define PORT(base, offset) (u8 *)(base + offset)
static inline unsigned int serial_in(unsigned char *base, int offset)
{
return readb(PORT(base, offset));
}
static inline void serial_out(unsigned char *base, int offset, int value)
{
writeb(value, PORT(base, offset));
}
void prom_putchar(char c)
{
int timeout;
unsigned char *uart_base;
uart_base = (unsigned char *)_loongson_uart_base[0];
timeout = 1024;
while (((serial_in(uart_base, UART_LSR) & UART_LSR_THRE) == 0) &&
(timeout-- > 0))
;
serial_out(uart_base, UART_TX, c);
}