blob: d32aaf13ff0f604ede77aa6c1c563637a8d14564 [file] [log] [blame]
Richard W.M. Jones9dd986c2009-04-25 13:56:19 +01001/*
2 * Virtual hardware watchdog.
3 *
4 * Copyright (C) 2009 Red Hat Inc.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
19 * USA.
20 *
21 * By Richard W.M. Jones (rjones@redhat.com).
22 */
23
24#include "qemu-common.h"
25#include "qemu-timer.h"
26#include "watchdog.h"
27#include "hw.h"
28#include "isa.h"
29#include "pc.h"
30
31/*#define IB700_DEBUG 1*/
32
33#ifdef IB700_DEBUG
34#define ib700_debug(fs,...) \
35 fprintf(stderr,"ib700: %s: "fs,__func__,##__VA_ARGS__)
36#else
37#define ib700_debug(fs,...)
38#endif
39
40/* This is the timer. We use a global here because the watchdog
41 * code ensures there is only one watchdog (it is located at a fixed,
42 * unchangable IO port, so there could only ever be one anyway).
43 */
44static QEMUTimer *timer = NULL;
45
46/* A write to this register enables the timer. */
47static void ib700_write_enable_reg(void *vp, uint32_t addr, uint32_t data)
48{
49 static int time_map[] = {
50 30, 28, 26, 24, 22, 20, 18, 16,
51 14, 12, 10, 8, 6, 4, 2, 0
52 };
53 int64 timeout;
54
55 ib700_debug("addr = %x, data = %x\n", addr, data);
56
57 timeout = (int64_t) time_map[data & 0xF] * ticks_per_sec;
58 qemu_mod_timer(timer, qemu_get_clock (vm_clock) + timeout);
59}
60
61/* A write (of any value) to this register disables the timer. */
62static void ib700_write_disable_reg(void *vp, uint32_t addr, uint32_t data)
63{
64 ib700_debug("addr = %x, data = %x\n", addr, data);
65
66 qemu_del_timer(timer);
67}
68
69/* This is called when the watchdog expires. */
70static void ib700_timer_expired(void *vp)
71{
72 ib700_debug("watchdog expired\n");
73
74 watchdog_perform_action();
75 qemu_del_timer(timer);
76}
77
78static void ib700_save(QEMUFile *f, void *vp)
79{
80 qemu_put_timer(f, timer);
81}
82
83static int ib700_load(QEMUFile *f, void *vp, int version)
84{
85 if (version != 0)
86 return -EINVAL;
87
88 qemu_get_timer(f, timer);
89
90 return 0;
91}
92
93/* Create and initialize a virtual IB700 during PC creation. */
94static void ib700_pc_init(PCIBus *unused)
95{
96 register_savevm("ib700_wdt", -1, 0, ib700_save, ib700_load, NULL);
97
98 register_ioport_write(0x441, 2, 1, ib700_write_disable_reg, NULL);
99 register_ioport_write(0x443, 2, 1, ib700_write_enable_reg, NULL);
100}
101
102static WatchdogTimerModel model = {
103 .wdt_name = "ib700",
104 .wdt_description = "iBASE 700",
105 .wdt_pc_init = ib700_pc_init,
106};
107
108void wdt_ib700_init(void)
109{
110 watchdog_add_model(&model);
111 timer = qemu_new_timer(vm_clock, ib700_timer_expired, NULL);
112}