ckfwq/linux-3.0.4/arch/mips/loongson/common/early_printk.c

67 lines
1.7 KiB
C

/* early printk support
*
* Copyright (c) 2009 Philippe Vachon <philippe@cowpig.ca>
* Copyright (c) 2009 Lemote Inc.
* Author: Wu Zhangjin, wuzhangjin@gmail.com
*
* 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.
*/
#include <linux/serial_reg.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)
{
#if 0
int timeout;
unsigned char *uart_base;
uart_base = (unsigned char *)_loongson_uart_base;
timeout = 1024;
while (((serial_in(uart_base, UART_LSR) & UART_LSR_THRE) == 0) &&
(timeout-- > 0))
;
serial_out(uart_base, UART_TX, c);
#else
unsigned int timeout = 1000;
//unsigned char *lsr = (unsigned char *)(0xbf004080 + 0x5);
//unsigned char *lsr = (unsigned char *)(0xbc108000 + 0x5);
unsigned char status;
#ifdef CONFIG_DMA_UART
unsigned char *lsr = (unsigned char *)(0xbc108000 + 0x5);
char *sdata = (unsigned char *)0xbc108000;
#else
// unsigned char *lsr = (unsigned char *)(0xbc108000 + 0x5);
// char *sdata = (unsigned char *)0xbc108000;
unsigned char *lsr = (unsigned char *)(0xbc108000 + 0x5);
char *sdata = (unsigned char *)0xbc108000;
#endif
while (timeout--) {
status = *lsr;
if (status & 0x20)
break;
};
if (timeout) //successful
*sdata = c;
#endif
}