Add access control support to qemu bridge helper
[qemu.git] / hw / wdt_ib700.c
1 /*
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, see <http://www.gnu.org/licenses/>.
18 *
19 * By Richard W.M. Jones (rjones@redhat.com).
20 */
21
22 #include "qemu-common.h"
23 #include "qemu-timer.h"
24 #include "watchdog.h"
25 #include "hw.h"
26 #include "isa.h"
27 #include "pc.h"
28
29 /*#define IB700_DEBUG 1*/
30
31 #ifdef IB700_DEBUG
32 #define ib700_debug(fs,...) \
33 fprintf(stderr,"ib700: %s: "fs,__func__,##__VA_ARGS__)
34 #else
35 #define ib700_debug(fs,...)
36 #endif
37
38 typedef struct IB700state {
39 ISADevice dev;
40 QEMUTimer *timer;
41 } IB700State;
42
43 /* This is the timer. We use a global here because the watchdog
44 * code ensures there is only one watchdog (it is located at a fixed,
45 * unchangeable IO port, so there could only ever be one anyway).
46 */
47
48 /* A write to this register enables the timer. */
49 static void ib700_write_enable_reg(void *vp, uint32_t addr, uint32_t data)
50 {
51 IB700State *s = vp;
52 static int time_map[] = {
53 30, 28, 26, 24, 22, 20, 18, 16,
54 14, 12, 10, 8, 6, 4, 2, 0
55 };
56 int64_t timeout;
57
58 ib700_debug("addr = %x, data = %x\n", addr, data);
59
60 timeout = (int64_t) time_map[data & 0xF] * get_ticks_per_sec();
61 qemu_mod_timer(s->timer, qemu_get_clock_ns (vm_clock) + timeout);
62 }
63
64 /* A write (of any value) to this register disables the timer. */
65 static void ib700_write_disable_reg(void *vp, uint32_t addr, uint32_t data)
66 {
67 IB700State *s = vp;
68
69 ib700_debug("addr = %x, data = %x\n", addr, data);
70
71 qemu_del_timer(s->timer);
72 }
73
74 /* This is called when the watchdog expires. */
75 static void ib700_timer_expired(void *vp)
76 {
77 IB700State *s = vp;
78
79 ib700_debug("watchdog expired\n");
80
81 watchdog_perform_action();
82 qemu_del_timer(s->timer);
83 }
84
85 static const VMStateDescription vmstate_ib700 = {
86 .name = "ib700_wdt",
87 .version_id = 0,
88 .minimum_version_id = 0,
89 .minimum_version_id_old = 0,
90 .fields = (VMStateField []) {
91 VMSTATE_TIMER(timer, IB700State),
92 VMSTATE_END_OF_LIST()
93 }
94 };
95
96 static int wdt_ib700_init(ISADevice *dev)
97 {
98 IB700State *s = DO_UPCAST(IB700State, dev, dev);
99
100 ib700_debug("watchdog init\n");
101
102 s->timer = qemu_new_timer_ns(vm_clock, ib700_timer_expired, s);
103 register_ioport_write(0x441, 2, 1, ib700_write_disable_reg, s);
104 register_ioport_write(0x443, 2, 1, ib700_write_enable_reg, s);
105
106 return 0;
107 }
108
109 static void wdt_ib700_reset(DeviceState *dev)
110 {
111 IB700State *s = DO_UPCAST(IB700State, dev.qdev, dev);
112
113 ib700_debug("watchdog reset\n");
114
115 qemu_del_timer(s->timer);
116 }
117
118 static WatchdogTimerModel model = {
119 .wdt_name = "ib700",
120 .wdt_description = "iBASE 700",
121 };
122
123 static void wdt_ib700_class_init(ObjectClass *klass, void *data)
124 {
125 ISADeviceClass *ic = ISA_DEVICE_CLASS(klass);
126 ic->init = wdt_ib700_init;
127 }
128
129 static DeviceInfo wdt_ib700_info = {
130 .name = "ib700",
131 .size = sizeof(IB700State),
132 .vmsd = &vmstate_ib700,
133 .reset = wdt_ib700_reset,
134 .class_init = wdt_ib700_class_init,
135 };
136
137 static void wdt_ib700_register_devices(void)
138 {
139 watchdog_add_model(&model);
140 isa_qdev_register(&wdt_ib700_info);
141 }
142
143 device_init(wdt_ib700_register_devices);