mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
39 lines
842 B
C
39 lines
842 B
C
// 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);
|
|
}
|