projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * Carsten Langgaard, carstenl@mips.com | |
| 3 | * Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved. | |
| 4 | * | |
| 5 | * This program is free software; you can distribute it and/or modify it | |
| 6 | * under the terms of the GNU General Public License (Version 2) as | |
| 7 | * published by the Free Software Foundation. | |
| 8 | * | |
| 9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 | * for more details. | |
| 13 | * | |
| 14 | * You should have received a copy of the GNU General Public License along | |
| 15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
| 16 | * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
| 17 | * | |
| 18 | * Putting things on the screen/serial line using YAMONs facilities. | |
| 19 | */ | |
| 36a88530 | 20 | #include <linux/console.h> |
| 1da177e4 | 21 | #include <linux/init.h> |
| 1da177e4 | 22 | #include <linux/serial_reg.h> |
| 1da177e4 LT |
23 | #include <asm/io.h> |
| 24 | ||
| 1da177e4 LT |
25 | |
| 26 | #define PORT(offset) (0x3f8 + (offset)) | |
| 27 | ||
| 1da177e4 LT |
28 | |
| 29 | static inline unsigned int serial_in(int offset) | |
| 30 | { | |
| 31 | return inb(PORT(offset)); | |
| 32 | } | |
| 33 | ||
| 34 | static inline void serial_out(int offset, int value) | |
| 35 | { | |
| 36 | outb(value, PORT(offset)); | |
| 37 | } | |
| 38 | ||
| 39 | int prom_putchar(char c) | |
| 40 | { | |
| 41 | while ((serial_in(UART_LSR) & UART_LSR_THRE) == 0) | |
| 42 | ; | |
| 43 | ||
| 44 | serial_out(UART_TX, c); | |
| 45 | ||
| 46 | return 1; | |
| 47 | } |