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(const char *s, unsigned n);
20
debug_cons_write(struct console * c,const char * s,unsigned n)21 static 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
35 static struct console early_console_instance = {
36 .name = "debug",
37 .write = debug_cons_write,
38 .flags = CON_PRINTBUFFER | CON_BOOT,
39 .index = -1
40 };
41
setup_early_printk(char * buf)42 static 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 }
52 early_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
unregister_early_console(void)61 static 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 }
68 late_initcall(unregister_early_console);
69
70 #endif
71