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