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
19asmlinkage void __init debug_cons_nputs(const char *s, unsigned n);
20
21static void __ref debug_cons_write(struct console *c,
22				   const char *s, unsigned n)
23{
24#if !(defined(CONFIG_SUN3) || defined(CONFIG_M68000) || \
25      defined(CONFIG_COLDFIRE))
26	if (MACH_IS_MVME147)
27		mvme147_scc_write(c, s, n);
28	else if (MACH_IS_MVME16x)
29		mvme16x_cons_write(c, s, n);
30	else
31		debug_cons_nputs(s, n);
32#endif
33}
34
35static struct console early_console_instance = {
36	.name  = "debug",
37	.write = debug_cons_write,
38	.flags = CON_PRINTBUFFER | CON_BOOT,
39	.index = -1
40};
41
42static int __init setup_early_printk(char *buf)
43{
44	if (early_console || buf)
45		return 0;
46
47	early_console = &early_console_instance;
48	register_console(early_console);
49
50	return 0;
51}
52early_param("earlyprintk", setup_early_printk);
53
54/*
55 * debug_cons_nputs() defined in arch/m68k/kernel/head.S cannot be called
56 * after init sections are discarded (for platforms that use it).
57 */
58#if !(defined(CONFIG_SUN3) || defined(CONFIG_M68000) || \
59      defined(CONFIG_COLDFIRE))
60
61static int __init unregister_early_console(void)
62{
63	if (!early_console || MACH_IS_MVME16x)
64		return 0;
65
66	return unregister_console(early_console);
67}
68late_initcall(unregister_early_console);
69
70#endif