2 * Carsten Langgaard, carstenl@mips.com
3 * Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
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.
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
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.
18 * Putting things on the screen/serial line using YAMONs facilities.
20 #include <linux/config.h>
21 #include <linux/init.h>
22 #include <linux/kernel.h>
23 #include <linux/serial_reg.h>
24 #include <linux/spinlock.h>
27 #ifdef CONFIG_MIPS_ATLAS
28 #include <asm/mips-boards/atlas.h>
30 #ifdef CONFIG_CPU_LITTLE_ENDIAN
31 #define PORT(offset) (ATLAS_UART_REGS_BASE + ((offset)<<3))
33 #define PORT(offset) (ATLAS_UART_REGS_BASE + 3 + ((offset)<<3))
36 #elif defined(CONFIG_MIPS_SEAD)
38 #include <asm/mips-boards/sead.h>
40 #ifdef CONFIG_CPU_LITTLE_ENDIAN
41 #define PORT(offset) (SEAD_UART0_REGS_BASE + ((offset)<<3))
43 #define PORT(offset) (SEAD_UART0_REGS_BASE + 3 + ((offset)<<3))
48 #define PORT(offset) (0x3f8 + (offset))
52 static inline unsigned int serial_in(int offset)
54 return inb(PORT(offset));
57 static inline void serial_out(int offset, int value)
59 outb(value, PORT(offset));
62 int putPromChar(char c)
64 while ((serial_in(UART_LSR) & UART_LSR_THRE) == 0)
67 serial_out(UART_TX, c);
72 char getPromChar(void)
74 while (!(serial_in(UART_LSR) & UART_LSR_DR))
77 return serial_in(UART_RX);
80 static spinlock_t con_lock = SPIN_LOCK_UNLOCKED;
82 static char buf[1024];
84 void __init prom_printf(char *fmt, ...)
91 spin_lock_irqsave(con_lock, flags);
94 l = vsprintf(buf, fmt, args); /* hopefully i < sizeof(buf) */
99 for (p = buf; p < buf_end; p++) {
100 /* Crude cr/nl handling is better than none */
105 /* wait for output to drain */
106 while ((serial_in(UART_LSR) & UART_LSR_TEMT) == 0)
108 spin_unlock_irqrestore(con_lock, flags);