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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 | ||
22 | #include "qemu-common.h" | |
1de7afc9 | 23 | #include "qemu/timer.h" |
0d09e41a | 24 | #include "sysemu/watchdog.h" |
83c9f4ca | 25 | #include "hw/hw.h" |
0d09e41a PB |
26 | #include "hw/isa/isa.h" |
27 | #include "hw/i386/pc.h" | |
9dd986cc RJ |
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 | ||
61e477f4 AF |
38 | #define TYPE_IB700 "ib700" |
39 | #define IB700(obj) OBJECT_CHECK(IB700State, (obj), TYPE_IB700) | |
40 | ||
f309270b | 41 | typedef struct IB700state { |
61e477f4 AF |
42 | ISADevice parent_obj; |
43 | ||
e8f27c72 | 44 | QEMUTimer *timer; |
f309270b JQ |
45 | } IB700State; |
46 | ||
9dd986cc RJ |
47 | /* This is the timer. We use a global here because the watchdog |
48 | * code ensures there is only one watchdog (it is located at a fixed, | |
66a0a2cb | 49 | * unchangeable IO port, so there could only ever be one anyway). |
9dd986cc | 50 | */ |
9dd986cc RJ |
51 | |
52 | /* A write to this register enables the timer. */ | |
53 | static void ib700_write_enable_reg(void *vp, uint32_t addr, uint32_t data) | |
54 | { | |
e8f27c72 | 55 | IB700State *s = vp; |
9dd986cc RJ |
56 | static int time_map[] = { |
57 | 30, 28, 26, 24, 22, 20, 18, 16, | |
58 | 14, 12, 10, 8, 6, 4, 2, 0 | |
59 | }; | |
c910cf96 | 60 | int64_t timeout; |
9dd986cc RJ |
61 | |
62 | ib700_debug("addr = %x, data = %x\n", addr, data); | |
63 | ||
6ee093c9 | 64 | timeout = (int64_t) time_map[data & 0xF] * get_ticks_per_sec(); |
74475455 | 65 | qemu_mod_timer(s->timer, qemu_get_clock_ns (vm_clock) + timeout); |
9dd986cc RJ |
66 | } |
67 | ||
68 | /* A write (of any value) to this register disables the timer. */ | |
69 | static void ib700_write_disable_reg(void *vp, uint32_t addr, uint32_t data) | |
70 | { | |
e8f27c72 JQ |
71 | IB700State *s = vp; |
72 | ||
9dd986cc RJ |
73 | ib700_debug("addr = %x, data = %x\n", addr, data); |
74 | ||
e8f27c72 | 75 | qemu_del_timer(s->timer); |
9dd986cc RJ |
76 | } |
77 | ||
78 | /* This is called when the watchdog expires. */ | |
79 | static void ib700_timer_expired(void *vp) | |
80 | { | |
e8f27c72 JQ |
81 | IB700State *s = vp; |
82 | ||
9dd986cc RJ |
83 | ib700_debug("watchdog expired\n"); |
84 | ||
85 | watchdog_perform_action(); | |
e8f27c72 | 86 | qemu_del_timer(s->timer); |
9dd986cc RJ |
87 | } |
88 | ||
9958068d JQ |
89 | static const VMStateDescription vmstate_ib700 = { |
90 | .name = "ib700_wdt", | |
91 | .version_id = 0, | |
92 | .minimum_version_id = 0, | |
93 | .minimum_version_id_old = 0, | |
94 | .fields = (VMStateField []) { | |
95 | VMSTATE_TIMER(timer, IB700State), | |
96 | VMSTATE_END_OF_LIST() | |
97 | } | |
98 | }; | |
9dd986cc | 99 | |
0c6c4e28 JK |
100 | static const MemoryRegionPortio wdt_portio_list[] = { |
101 | { 0x441, 2, 1, .write = ib700_write_disable_reg, }, | |
102 | { 0x443, 2, 1, .write = ib700_write_enable_reg, }, | |
103 | PORTIO_END_OF_LIST(), | |
104 | }; | |
105 | ||
db895a1e | 106 | static void wdt_ib700_realize(DeviceState *dev, Error **errp) |
9dd986cc | 107 | { |
61e477f4 | 108 | IB700State *s = IB700(dev); |
0c6c4e28 | 109 | PortioList *port_list = g_new(PortioList, 1); |
f309270b | 110 | |
36888c63 RJ |
111 | ib700_debug("watchdog init\n"); |
112 | ||
74475455 | 113 | s->timer = qemu_new_timer_ns(vm_clock, ib700_timer_expired, s); |
0c6c4e28 | 114 | |
db10ca90 | 115 | portio_list_init(port_list, OBJECT(s), wdt_portio_list, s, "ib700"); |
0c6c4e28 | 116 | portio_list_add(port_list, isa_address_space_io(&s->parent_obj), 0); |
9dd986cc RJ |
117 | } |
118 | ||
36888c63 RJ |
119 | static void wdt_ib700_reset(DeviceState *dev) |
120 | { | |
61e477f4 | 121 | IB700State *s = IB700(dev); |
36888c63 RJ |
122 | |
123 | ib700_debug("watchdog reset\n"); | |
124 | ||
125 | qemu_del_timer(s->timer); | |
126 | } | |
127 | ||
9dd986cc RJ |
128 | static WatchdogTimerModel model = { |
129 | .wdt_name = "ib700", | |
130 | .wdt_description = "iBASE 700", | |
9dd986cc RJ |
131 | }; |
132 | ||
8f04ee08 AL |
133 | static void wdt_ib700_class_init(ObjectClass *klass, void *data) |
134 | { | |
39bffca2 | 135 | DeviceClass *dc = DEVICE_CLASS(klass); |
db895a1e AF |
136 | |
137 | dc->realize = wdt_ib700_realize; | |
39bffca2 AL |
138 | dc->reset = wdt_ib700_reset; |
139 | dc->vmsd = &vmstate_ib700; | |
8f04ee08 AL |
140 | } |
141 | ||
8c43a6f0 | 142 | static const TypeInfo wdt_ib700_info = { |
61e477f4 | 143 | .name = TYPE_IB700, |
39bffca2 AL |
144 | .parent = TYPE_ISA_DEVICE, |
145 | .instance_size = sizeof(IB700State), | |
146 | .class_init = wdt_ib700_class_init, | |
09aaa160 MA |
147 | }; |
148 | ||
83f7d43a | 149 | static void wdt_ib700_register_types(void) |
9dd986cc RJ |
150 | { |
151 | watchdog_add_model(&model); | |
39bffca2 | 152 | type_register_static(&wdt_ib700_info); |
9dd986cc | 153 | } |
09aaa160 | 154 | |
83f7d43a | 155 | type_init(wdt_ib700_register_types) |