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) 2014 Finn Thain 7 */ 8 9 #include <linux/kernel.h> 10 #include <linux/console.h> 11 #include <linux/init.h> 12 #include <linux/string.h> 13 #include <asm/setup.h> 14 15 16 #include "../mvme147/mvme147.h" 17 #include "../mvme16x/mvme16x.h" 18 19 asmlinkage void __init debug_cons_nputs(struct console *c, const char *s, unsigned int n); 20 21 static struct console early_console_instance = { 22 .name = "debug", 23 .flags = CON_PRINTBUFFER | CON_BOOT, 24 .index = -1 25 }; 26 27 static int __init setup_early_printk(char *buf) 28 { 29 if (early_console || buf) 30 return 0; 31 32 if (MACH_IS_MVME147) 33 early_console_instance.write = mvme147_scc_write; 34 else if (MACH_IS_MVME16x) 35 early_console_instance.write = mvme16x_cons_write; 36 else 37 early_console_instance.write = debug_cons_nputs; 38 early_console = &early_console_instance; 39 register_console(early_console); 40 41 return 0; 42 } 43 early_param("earlyprintk", setup_early_printk); 44 45 static int __init unregister_early_console(void) 46 { 47 /* 48 * debug_cons_nputs() defined in arch/m68k/kernel/head.S cannot be 49 * called after init sections are discarded (for platforms that use it). 50 */ 51 if (early_console && early_console->write == debug_cons_nputs) 52 return unregister_console(early_console); 53 54 return 0; 55 } 56 late_initcall(unregister_early_console); 57