Commit f6a2740d authored by Wu Zhangjin's avatar Wu Zhangjin Committed by Ralf Baechle
Browse files

MIPS: Loongson: Add new early_printk implmentation

This patch is based on the implementation in the lm2e-fixes branch of
Philippe's git://

 and the
malta-specific early_printk implementation.
Signed-off-by: default avatarWu Zhangjin <>
Signed-off-by: default avatarRalf Baechle <>
parent 95ff7c95
......@@ -4,4 +4,9 @@
obj-y += setup.o prom.o reset.o irq.o pci.o bonito-irq.o mem.o
# Early printk support
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
/* early printk support
* Copyright (c) 2009 Philippe Vachon <>
* Copyright (C) 2009 Lemote Inc. & Insititute of Computing Technology
* Author: Wu Zhangjin,
* 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/io.h>
#include <linux/init.h>
#include <linux/serial_reg.h>
#include <asm/mips-boards/bonito64.h>
#define PORT(base, offset) (u8 *)(base + offset)
static inline unsigned int serial_in(phys_addr_t base, int offset)
return readb(PORT(base, offset));
static inline void serial_out(phys_addr_t base, int offset, int value)
writeb(value, PORT(base, offset));
void prom_putchar(char c)
phys_addr_t uart_base =
(phys_addr_t) ioremap_nocache(UART_BASE, 8);
while ((serial_in(uart_base, UART_LSR) & UART_LSR_THRE) == 0)
serial_out(uart_base, UART_TX, c);
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