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/arch/ppc/syslib/gen550_kgdb.c

https://bitbucket.org/evzijst/gittest
C | 86 lines | 52 code | 12 blank | 22 comment | 7 complexity | 21e97a57d00e7af43cbc7414e225abc6 MD5 | raw file
 1/*
 2 * arch/ppc/syslib/gen550_kgdb.c
 3 *
 4 * Generic 16550 kgdb support intended to be useful on a variety
 5 * of platforms.  To enable this support, it is necessary to set
 6 * the CONFIG_GEN550 option.  Any virtual mapping of the serial
 7 * port(s) to be used can be accomplished by setting
 8 * ppc_md.early_serial_map to a platform-specific mapping function.
 9 *
10 * Adapted from ppc4xx_kgdb.c.
11 *
12 * Author: Matt Porter <mporter@kernel.crashing.org>
13 *
14 * 2002-2004 (c) MontaVista Software, Inc.  This file is licensed under
15 * the terms of the GNU General Public License version 2.  This program
16 * is licensed "as is" without any warranty of any kind, whether express
17 * or implied.
18 */
19
20#include <linux/config.h>
21#include <linux/types.h>
22#include <linux/kernel.h>
23
24#include <asm/machdep.h>
25
26extern unsigned long serial_init(int, void *);
27extern unsigned long serial_getc(unsigned long);
28extern unsigned long serial_putc(unsigned long, unsigned char);
29
30#if defined(CONFIG_KGDB_TTYS0)
31#define KGDB_PORT 0
32#elif defined(CONFIG_KGDB_TTYS1)
33#define KGDB_PORT 1
34#elif defined(CONFIG_KGDB_TTYS2)
35#define KGDB_PORT 2
36#elif defined(CONFIG_KGDB_TTYS3)
37#define KGDB_PORT 3
38#else
39#error "invalid kgdb_tty port"
40#endif
41
42static volatile unsigned int kgdb_debugport;
43
44void putDebugChar(unsigned char c)
45{
46	if (kgdb_debugport == 0)
47		kgdb_debugport = serial_init(KGDB_PORT, NULL);
48
49	serial_putc(kgdb_debugport, c);
50}
51
52int getDebugChar(void)
53{
54	if (kgdb_debugport == 0)
55		kgdb_debugport = serial_init(KGDB_PORT, NULL);
56
57	return(serial_getc(kgdb_debugport));
58}
59
60void kgdb_interruptible(int enable)
61{
62	return;
63}
64
65void putDebugString(char* str)
66{
67	while (*str != '\0') {
68		putDebugChar(*str);
69		str++;
70	}
71	putDebugChar('\r');
72	return;
73}
74
75/*
76 * Note: gen550_init() must be called already on the port we are going
77 * to use.
78 */
79void
80gen550_kgdb_map_scc(void)
81{
82	printk(KERN_DEBUG "kgdb init\n");
83	if (ppc_md.early_serial_map)
84		ppc_md.early_serial_map();
85	kgdb_debugport = serial_init(KGDB_PORT, NULL);
86}