uart_dbg.c revision 331722 
1/*-
2 * Copyright (c) 2004 Marcel Moolenaar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/11/sys/dev/uart/uart_dbg.c 331722 2018-03-29 02:50:57Z eadler $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/bus.h>
33#include <sys/kernel.h>
34#include <machine/bus.h>
35
36#include <gdb/gdb.h>
37
38#include <dev/uart/uart.h>
39#include <dev/uart/uart_cpu.h>
40
41static gdb_probe_f uart_dbg_probe;
42static gdb_init_f uart_dbg_init;
43static gdb_term_f uart_dbg_term;
44static gdb_getc_f uart_dbg_getc;
45static gdb_putc_f uart_dbg_putc;
46
47GDB_DBGPORT(uart, uart_dbg_probe, uart_dbg_init, uart_dbg_term,
48    uart_dbg_getc, uart_dbg_putc);
49
50static struct uart_devinfo uart_dbgport;
51
52static int
53uart_dbg_probe(void)
54{
55
56	if (uart_cpu_getdev(UART_DEV_DBGPORT, &uart_dbgport))
57		return (-1);
58
59	if (uart_probe(&uart_dbgport))
60		return (-1);
61
62	return (0);
63}
64
65static void
66uart_dbg_init(void)
67{
68
69	uart_dbgport.type = UART_DEV_DBGPORT;
70	uart_add_sysdev(&uart_dbgport);
71	uart_init(&uart_dbgport);
72}
73
74static void
75uart_dbg_term(void)
76{
77
78	uart_term(&uart_dbgport);
79}
80
81static void
82uart_dbg_putc(int c)
83{
84
85	uart_putc(&uart_dbgport, c);
86}
87
88static int
89uart_dbg_getc(void)
90{
91
92	return (uart_poll(&uart_dbgport));
93}
94