ARM: etm: Add sysfs entry to enable timestamps if supported
[linux-2.6.git] / arch / unicore32 / kernel / early_printk.c
1 /*
2  * linux/arch/unicore32/kernel/early_printk.c
3  *
4  * Code specific to PKUnity SoC and UniCore ISA
5  *
6  * Copyright (C) 2001-2010 GUAN Xue-tao
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  */
12 #include <linux/console.h>
13 #include <linux/init.h>
14 #include <linux/string.h>
15 #include <mach/ocd.h>
16
17 /* On-Chip-Debugger functions */
18
19 static void early_ocd_write(struct console *con, const char *s, unsigned n)
20 {
21         while (*s && n-- > 0) {
22                 if (*s == '\n')
23                         ocd_putc((int)'\r');
24                 ocd_putc((int)*s);
25                 s++;
26         }
27 }
28
29 static struct console early_ocd_console = {
30         .name =         "earlyocd",
31         .write =        early_ocd_write,
32         .flags =        CON_PRINTBUFFER,
33         .index =        -1,
34 };
35
36 /* Direct interface for emergencies */
37 static struct console *early_console = &early_ocd_console;
38
39 static int __initdata keep_early;
40
41 static int __init setup_early_printk(char *buf)
42 {
43         if (!buf)
44                 return 0;
45
46         if (strstr(buf, "keep"))
47                 keep_early = 1;
48
49         if (!strncmp(buf, "ocd", 3))
50                 early_console = &early_ocd_console;
51
52         if (keep_early)
53                 early_console->flags &= ~CON_BOOT;
54         else
55                 early_console->flags |= CON_BOOT;
56         register_console(early_console);
57         return 0;
58 }
59 early_param("earlyprintk", setup_early_printk);