blob: 987cc0414e6e880172318a53525bea57cf28648a [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#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}