Ralf Baechle | c78cbf4 | 2005-09-30 13:59:37 +0100 | [diff] [blame] | 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 | */ |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/serial_reg.h> |
| 23 | #include <linux/spinlock.h> |
| 24 | #include <asm/io.h> |
| 25 | #include <asm/system.h> |
| 26 | |
| 27 | static inline unsigned int serial_in(int offset) |
| 28 | { |
| 29 | return inb(0x3f8 + offset); |
| 30 | } |
| 31 | |
| 32 | static inline void serial_out(int offset, int value) |
| 33 | { |
| 34 | outb(value, 0x3f8 + offset); |
| 35 | } |
| 36 | |
| 37 | int putPromChar(char c) |
| 38 | { |
| 39 | while ((serial_in(UART_LSR) & UART_LSR_THRE) == 0) |
| 40 | ; |
| 41 | |
| 42 | serial_out(UART_TX, c); |
| 43 | |
| 44 | return 1; |
| 45 | } |
| 46 | |
| 47 | char getPromChar(void) |
| 48 | { |
| 49 | while (!(serial_in(UART_LSR) & 1)) |
| 50 | ; |
| 51 | |
| 52 | return serial_in(UART_RX); |
| 53 | } |
| 54 | |
| 55 | void prom_printf(char *fmt, ...) |
| 56 | { |
| 57 | va_list args; |
| 58 | int l; |
| 59 | char *p, *buf_end; |
| 60 | char buf[1024]; |
| 61 | |
| 62 | va_start(args, fmt); |
| 63 | l = vsprintf(buf, fmt, args); /* hopefully i < sizeof(buf) */ |
| 64 | va_end(args); |
| 65 | |
| 66 | buf_end = buf + l; |
| 67 | |
| 68 | for (p = buf; p < buf_end; p++) { |
| 69 | /* Crude cr/nl handling is better than none */ |
| 70 | if (*p == '\n') |
| 71 | putPromChar('\r'); |
| 72 | putPromChar(*p); |
| 73 | } |
| 74 | } |