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28bab059 G |
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 | ||
28bab059 G |
36 | static int __init setup_early_printk(char *buf) |
37 | { | |
d0380e6c | 38 | if (!buf || early_console) |
28bab059 G |
39 | return 0; |
40 | ||
d0380e6c | 41 | early_console = &early_ocd_console; |
40e05dd0 | 42 | if (strstr(buf, "keep")) |
28bab059 G |
43 | early_console->flags &= ~CON_BOOT; |
44 | else | |
45 | early_console->flags |= CON_BOOT; | |
46 | register_console(early_console); | |
47 | return 0; | |
48 | } | |
49 | early_param("earlyprintk", setup_early_printk); |