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Commit | Line | Data |
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9dd986cc RJ |
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 | |
8167ee88 | 17 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
9dd986cc RJ |
18 | * |
19 | * By Richard W.M. Jones (rjones@redhat.com). | |
20 | */ | |
21 | ||
0430891c | 22 | #include "qemu/osdep.h" |
0b8fa32f | 23 | #include "qemu/module.h" |
1de7afc9 | 24 | #include "qemu/timer.h" |
0d09e41a | 25 | #include "sysemu/watchdog.h" |
83c9f4ca | 26 | #include "hw/hw.h" |
0d09e41a | 27 | #include "hw/isa/isa.h" |
d6454270 | 28 | #include "migration/vmstate.h" |
9dd986cc RJ |
29 | |
30 | /*#define IB700_DEBUG 1*/ | |
31 | ||
32 | #ifdef IB700_DEBUG | |
33 | #define ib700_debug(fs,...) \ | |
34 | fprintf(stderr,"ib700: %s: "fs,__func__,##__VA_ARGS__) | |
35 | #else | |
36 | #define ib700_debug(fs,...) | |
37 | #endif | |
38 | ||
61e477f4 AF |
39 | #define TYPE_IB700 "ib700" |
40 | #define IB700(obj) OBJECT_CHECK(IB700State, (obj), TYPE_IB700) | |
41 | ||
f309270b | 42 | typedef struct IB700state { |
61e477f4 AF |
43 | ISADevice parent_obj; |
44 | ||
e8f27c72 | 45 | QEMUTimer *timer; |
848696bf KB |
46 | |
47 | PortioList port_list; | |
f309270b JQ |
48 | } IB700State; |
49 | ||
9dd986cc RJ |
50 | /* This is the timer. We use a global here because the watchdog |
51 | * code ensures there is only one watchdog (it is located at a fixed, | |
66a0a2cb | 52 | * unchangeable IO port, so there could only ever be one anyway). |
9dd986cc | 53 | */ |
9dd986cc RJ |
54 | |
55 | /* A write to this register enables the timer. */ | |
56 | static void ib700_write_enable_reg(void *vp, uint32_t addr, uint32_t data) | |
57 | { | |
e8f27c72 | 58 | IB700State *s = vp; |
9dd986cc RJ |
59 | static int time_map[] = { |
60 | 30, 28, 26, 24, 22, 20, 18, 16, | |
61 | 14, 12, 10, 8, 6, 4, 2, 0 | |
62 | }; | |
c910cf96 | 63 | int64_t timeout; |
9dd986cc RJ |
64 | |
65 | ib700_debug("addr = %x, data = %x\n", addr, data); | |
66 | ||
73bcb24d | 67 | timeout = (int64_t) time_map[data & 0xF] * NANOSECONDS_PER_SECOND; |
bc72ad67 | 68 | timer_mod(s->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + timeout); |
9dd986cc RJ |
69 | } |
70 | ||
71 | /* A write (of any value) to this register disables the timer. */ | |
72 | static void ib700_write_disable_reg(void *vp, uint32_t addr, uint32_t data) | |
73 | { | |
e8f27c72 JQ |
74 | IB700State *s = vp; |
75 | ||
9dd986cc RJ |
76 | ib700_debug("addr = %x, data = %x\n", addr, data); |
77 | ||
bc72ad67 | 78 | timer_del(s->timer); |
9dd986cc RJ |
79 | } |
80 | ||
81 | /* This is called when the watchdog expires. */ | |
82 | static void ib700_timer_expired(void *vp) | |
83 | { | |
e8f27c72 JQ |
84 | IB700State *s = vp; |
85 | ||
9dd986cc RJ |
86 | ib700_debug("watchdog expired\n"); |
87 | ||
88 | watchdog_perform_action(); | |
bc72ad67 | 89 | timer_del(s->timer); |
9dd986cc RJ |
90 | } |
91 | ||
9958068d JQ |
92 | static const VMStateDescription vmstate_ib700 = { |
93 | .name = "ib700_wdt", | |
94 | .version_id = 0, | |
95 | .minimum_version_id = 0, | |
d49805ae | 96 | .fields = (VMStateField[]) { |
e720677e | 97 | VMSTATE_TIMER_PTR(timer, IB700State), |
9958068d JQ |
98 | VMSTATE_END_OF_LIST() |
99 | } | |
100 | }; | |
9dd986cc | 101 | |
0c6c4e28 JK |
102 | static const MemoryRegionPortio wdt_portio_list[] = { |
103 | { 0x441, 2, 1, .write = ib700_write_disable_reg, }, | |
104 | { 0x443, 2, 1, .write = ib700_write_enable_reg, }, | |
105 | PORTIO_END_OF_LIST(), | |
106 | }; | |
107 | ||
db895a1e | 108 | static void wdt_ib700_realize(DeviceState *dev, Error **errp) |
9dd986cc | 109 | { |
61e477f4 | 110 | IB700State *s = IB700(dev); |
f309270b | 111 | |
36888c63 RJ |
112 | ib700_debug("watchdog init\n"); |
113 | ||
bc72ad67 | 114 | s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, ib700_timer_expired, s); |
0c6c4e28 | 115 | |
848696bf KB |
116 | portio_list_init(&s->port_list, OBJECT(s), wdt_portio_list, s, "ib700"); |
117 | portio_list_add(&s->port_list, isa_address_space_io(&s->parent_obj), 0); | |
9dd986cc RJ |
118 | } |
119 | ||
36888c63 RJ |
120 | static void wdt_ib700_reset(DeviceState *dev) |
121 | { | |
61e477f4 | 122 | IB700State *s = IB700(dev); |
36888c63 RJ |
123 | |
124 | ib700_debug("watchdog reset\n"); | |
125 | ||
bc72ad67 | 126 | timer_del(s->timer); |
36888c63 RJ |
127 | } |
128 | ||
9dd986cc RJ |
129 | static WatchdogTimerModel model = { |
130 | .wdt_name = "ib700", | |
131 | .wdt_description = "iBASE 700", | |
9dd986cc RJ |
132 | }; |
133 | ||
8f04ee08 AL |
134 | static void wdt_ib700_class_init(ObjectClass *klass, void *data) |
135 | { | |
39bffca2 | 136 | DeviceClass *dc = DEVICE_CLASS(klass); |
db895a1e AF |
137 | |
138 | dc->realize = wdt_ib700_realize; | |
39bffca2 AL |
139 | dc->reset = wdt_ib700_reset; |
140 | dc->vmsd = &vmstate_ib700; | |
125ee0ed | 141 | set_bit(DEVICE_CATEGORY_MISC, dc->categories); |
8f04ee08 AL |
142 | } |
143 | ||
8c43a6f0 | 144 | static const TypeInfo wdt_ib700_info = { |
61e477f4 | 145 | .name = TYPE_IB700, |
39bffca2 AL |
146 | .parent = TYPE_ISA_DEVICE, |
147 | .instance_size = sizeof(IB700State), | |
148 | .class_init = wdt_ib700_class_init, | |
09aaa160 MA |
149 | }; |
150 | ||
83f7d43a | 151 | static void wdt_ib700_register_types(void) |
9dd986cc RJ |
152 | { |
153 | watchdog_add_model(&model); | |
39bffca2 | 154 | type_register_static(&wdt_ib700_info); |
9dd986cc | 155 | } |
09aaa160 | 156 | |
83f7d43a | 157 | type_init(wdt_ib700_register_types) |