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f6a2740d WZ |
1 | /* early printk support |
2 | * | |
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 | |
6 | * | |
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. | |
11 | */ | |
f6a2740d WZ |
12 | #include <linux/serial_reg.h> |
13 | ||
5e983ff6 | 14 | #include <loongson.h> |
85749d24 | 15 | #include <machine.h> |
f6a2740d WZ |
16 | |
17 | #define PORT(base, offset) (u8 *)(base + offset) | |
18 | ||
19 | static inline unsigned int serial_in(phys_addr_t base, int offset) | |
20 | { | |
21 | return readb(PORT(base, offset)); | |
22 | } | |
23 | ||
24 | static inline void serial_out(phys_addr_t base, int offset, int value) | |
25 | { | |
26 | writeb(value, PORT(base, offset)); | |
27 | } | |
28 | ||
29 | void prom_putchar(char c) | |
30 | { | |
31 | phys_addr_t uart_base = | |
85749d24 | 32 | (phys_addr_t) ioremap_nocache(LOONGSON_UART_BASE, 8); |
f6a2740d WZ |
33 | |
34 | while ((serial_in(uart_base, UART_LSR) & UART_LSR_THRE) == 0) | |
35 | ; | |
36 | ||
37 | serial_out(uart_base, UART_TX, c); | |
38 | } |