1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 2002, 2003, 06, 07 Ralf Baechle (ralf@linux-mips.org) 7 * Copyright (C) 2007 MIPS Technologies, Inc. 8 * written by Ralf Baechle (ralf@linux-mips.org) 9 */ 10 #include <linux/kernel.h> 11 #include <linux/console.h> 12 #include <linux/printk.h> 13 #include <linux/init.h> 14 15 #include <asm/setup.h> 16 17 extern void prom_putchar(char); 18 19 static void early_console_write(struct console *con, const char *s, unsigned n) 20 { 21 while (n-- && *s) { 22 if (*s == '\n') 23 prom_putchar('\r'); 24 prom_putchar(*s); 25 s++; 26 } 27 } 28 29 static struct console early_console_prom = { 30 .name = "early", 31 .write = early_console_write, 32 .flags = CON_PRINTBUFFER | CON_BOOT, 33 .index = -1 34 }; 35 36 void __init setup_early_printk(void) 37 { 38 if (early_console) 39 return; 40 early_console = &early_console_prom; 41 42 register_console(&early_console_prom); 43 } 44