1 /* early printk support
3 * Copyright (c) 2009 Philippe Vachon <philippe@cowpig.ca>
4 * Copyright (C) 2009 Lemote Inc. & Insititute of Computing Technology
5 * Author: Wu Zhangjin, wuzj@lemote.com
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
12 #include <linux/serial_reg.h>
16 #define UART_BASE (BONITO_PCIIO_BASE + 0x3f8)
18 #define PORT(base, offset) (u8 *)(base + offset)
20 static inline unsigned int serial_in(phys_addr_t base, int offset)
22 return readb(PORT(base, offset));
25 static inline void serial_out(phys_addr_t base, int offset, int value)
27 writeb(value, PORT(base, offset));
30 void prom_putchar(char c)
32 phys_addr_t uart_base =
33 (phys_addr_t) ioremap_nocache(UART_BASE, 8);
35 while ((serial_in(uart_base, UART_LSR) & UART_LSR_THRE) == 0)
38 serial_out(uart_base, UART_TX, c);