root / hw / watchdog / wdt_ib700.c @ f487b677
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1 | 9dd986cc | Richard W.M. Jones | /*
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2 | 9dd986cc | Richard W.M. Jones | * Virtual hardware watchdog.
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3 | 9dd986cc | Richard W.M. Jones | *
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4 | 9dd986cc | Richard W.M. Jones | * Copyright (C) 2009 Red Hat Inc.
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5 | 9dd986cc | Richard W.M. Jones | *
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6 | 9dd986cc | Richard W.M. Jones | * This program is free software; you can redistribute it and/or
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7 | 9dd986cc | Richard W.M. Jones | * modify it under the terms of the GNU General Public License
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8 | 9dd986cc | Richard W.M. Jones | * as published by the Free Software Foundation; either version 2
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9 | 9dd986cc | Richard W.M. Jones | * of the License, or (at your option) any later version.
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10 | 9dd986cc | Richard W.M. Jones | *
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11 | 9dd986cc | Richard W.M. Jones | * This program is distributed in the hope that it will be useful,
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12 | 9dd986cc | Richard W.M. Jones | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | 9dd986cc | Richard W.M. Jones | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | 9dd986cc | Richard W.M. Jones | * GNU General Public License for more details.
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15 | 9dd986cc | Richard W.M. Jones | *
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16 | 9dd986cc | Richard W.M. Jones | * You should have received a copy of the GNU General Public License
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17 | 8167ee88 | Blue Swirl | * along with this program; if not, see <http://www.gnu.org/licenses/>.
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18 | 9dd986cc | Richard W.M. Jones | *
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19 | 9dd986cc | Richard W.M. Jones | * By Richard W.M. Jones (rjones@redhat.com).
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20 | 9dd986cc | Richard W.M. Jones | */
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21 | 9dd986cc | Richard W.M. Jones | |
22 | 9dd986cc | Richard W.M. Jones | #include "qemu-common.h" |
23 | 1de7afc9 | Paolo Bonzini | #include "qemu/timer.h" |
24 | 0d09e41a | Paolo Bonzini | #include "sysemu/watchdog.h" |
25 | 83c9f4ca | Paolo Bonzini | #include "hw/hw.h" |
26 | 0d09e41a | Paolo Bonzini | #include "hw/isa/isa.h" |
27 | 0d09e41a | Paolo Bonzini | #include "hw/i386/pc.h" |
28 | 9dd986cc | Richard W.M. Jones | |
29 | 9dd986cc | Richard W.M. Jones | /*#define IB700_DEBUG 1*/
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30 | 9dd986cc | Richard W.M. Jones | |
31 | 9dd986cc | Richard W.M. Jones | #ifdef IB700_DEBUG
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32 | 9dd986cc | Richard W.M. Jones | #define ib700_debug(fs,...) \
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33 | 9dd986cc | Richard W.M. Jones | fprintf(stderr,"ib700: %s: "fs,__func__,##__VA_ARGS__) |
34 | 9dd986cc | Richard W.M. Jones | #else
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35 | 9dd986cc | Richard W.M. Jones | #define ib700_debug(fs,...)
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36 | 9dd986cc | Richard W.M. Jones | #endif
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37 | 9dd986cc | Richard W.M. Jones | |
38 | 61e477f4 | Andreas Färber | #define TYPE_IB700 "ib700" |
39 | 61e477f4 | Andreas Färber | #define IB700(obj) OBJECT_CHECK(IB700State, (obj), TYPE_IB700)
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40 | 61e477f4 | Andreas Färber | |
41 | f309270b | Juan Quintela | typedef struct IB700state { |
42 | 61e477f4 | Andreas Färber | ISADevice parent_obj; |
43 | 61e477f4 | Andreas Färber | |
44 | e8f27c72 | Juan Quintela | QEMUTimer *timer; |
45 | f309270b | Juan Quintela | } IB700State; |
46 | f309270b | Juan Quintela | |
47 | 9dd986cc | Richard W.M. Jones | /* This is the timer. We use a global here because the watchdog
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48 | 9dd986cc | Richard W.M. Jones | * code ensures there is only one watchdog (it is located at a fixed,
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49 | 66a0a2cb | Dong Xu Wang | * unchangeable IO port, so there could only ever be one anyway).
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50 | 9dd986cc | Richard W.M. Jones | */
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51 | 9dd986cc | Richard W.M. Jones | |
52 | 9dd986cc | Richard W.M. Jones | /* A write to this register enables the timer. */
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53 | 9dd986cc | Richard W.M. Jones | static void ib700_write_enable_reg(void *vp, uint32_t addr, uint32_t data) |
54 | 9dd986cc | Richard W.M. Jones | { |
55 | e8f27c72 | Juan Quintela | IB700State *s = vp; |
56 | 9dd986cc | Richard W.M. Jones | static int time_map[] = { |
57 | 9dd986cc | Richard W.M. Jones | 30, 28, 26, 24, 22, 20, 18, 16, |
58 | 9dd986cc | Richard W.M. Jones | 14, 12, 10, 8, 6, 4, 2, 0 |
59 | 9dd986cc | Richard W.M. Jones | }; |
60 | c910cf96 | Andreas Färber | int64_t timeout; |
61 | 9dd986cc | Richard W.M. Jones | |
62 | 9dd986cc | Richard W.M. Jones | ib700_debug("addr = %x, data = %x\n", addr, data);
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63 | 9dd986cc | Richard W.M. Jones | |
64 | 6ee093c9 | Juan Quintela | timeout = (int64_t) time_map[data & 0xF] * get_ticks_per_sec();
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65 | 74475455 | Paolo Bonzini | qemu_mod_timer(s->timer, qemu_get_clock_ns (vm_clock) + timeout); |
66 | 9dd986cc | Richard W.M. Jones | } |
67 | 9dd986cc | Richard W.M. Jones | |
68 | 9dd986cc | Richard W.M. Jones | /* A write (of any value) to this register disables the timer. */
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69 | 9dd986cc | Richard W.M. Jones | static void ib700_write_disable_reg(void *vp, uint32_t addr, uint32_t data) |
70 | 9dd986cc | Richard W.M. Jones | { |
71 | e8f27c72 | Juan Quintela | IB700State *s = vp; |
72 | e8f27c72 | Juan Quintela | |
73 | 9dd986cc | Richard W.M. Jones | ib700_debug("addr = %x, data = %x\n", addr, data);
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74 | 9dd986cc | Richard W.M. Jones | |
75 | e8f27c72 | Juan Quintela | qemu_del_timer(s->timer); |
76 | 9dd986cc | Richard W.M. Jones | } |
77 | 9dd986cc | Richard W.M. Jones | |
78 | 9dd986cc | Richard W.M. Jones | /* This is called when the watchdog expires. */
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79 | 9dd986cc | Richard W.M. Jones | static void ib700_timer_expired(void *vp) |
80 | 9dd986cc | Richard W.M. Jones | { |
81 | e8f27c72 | Juan Quintela | IB700State *s = vp; |
82 | e8f27c72 | Juan Quintela | |
83 | 9dd986cc | Richard W.M. Jones | ib700_debug("watchdog expired\n");
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84 | 9dd986cc | Richard W.M. Jones | |
85 | 9dd986cc | Richard W.M. Jones | watchdog_perform_action(); |
86 | e8f27c72 | Juan Quintela | qemu_del_timer(s->timer); |
87 | 9dd986cc | Richard W.M. Jones | } |
88 | 9dd986cc | Richard W.M. Jones | |
89 | 9958068d | Juan Quintela | static const VMStateDescription vmstate_ib700 = { |
90 | 9958068d | Juan Quintela | .name = "ib700_wdt",
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91 | 9958068d | Juan Quintela | .version_id = 0,
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92 | 9958068d | Juan Quintela | .minimum_version_id = 0,
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93 | 9958068d | Juan Quintela | .minimum_version_id_old = 0,
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94 | 9958068d | Juan Quintela | .fields = (VMStateField []) { |
95 | 9958068d | Juan Quintela | VMSTATE_TIMER(timer, IB700State), |
96 | 9958068d | Juan Quintela | VMSTATE_END_OF_LIST() |
97 | 9958068d | Juan Quintela | } |
98 | 9958068d | Juan Quintela | }; |
99 | 9dd986cc | Richard W.M. Jones | |
100 | db895a1e | Andreas Färber | static void wdt_ib700_realize(DeviceState *dev, Error **errp) |
101 | 9dd986cc | Richard W.M. Jones | { |
102 | 61e477f4 | Andreas Färber | IB700State *s = IB700(dev); |
103 | f309270b | Juan Quintela | |
104 | 36888c63 | Richard W.M. Jones | ib700_debug("watchdog init\n");
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105 | 36888c63 | Richard W.M. Jones | |
106 | 74475455 | Paolo Bonzini | s->timer = qemu_new_timer_ns(vm_clock, ib700_timer_expired, s); |
107 | f309270b | Juan Quintela | register_ioport_write(0x441, 2, 1, ib700_write_disable_reg, s); |
108 | f309270b | Juan Quintela | register_ioport_write(0x443, 2, 1, ib700_write_enable_reg, s); |
109 | 9dd986cc | Richard W.M. Jones | } |
110 | 9dd986cc | Richard W.M. Jones | |
111 | 36888c63 | Richard W.M. Jones | static void wdt_ib700_reset(DeviceState *dev) |
112 | 36888c63 | Richard W.M. Jones | { |
113 | 61e477f4 | Andreas Färber | IB700State *s = IB700(dev); |
114 | 36888c63 | Richard W.M. Jones | |
115 | 36888c63 | Richard W.M. Jones | ib700_debug("watchdog reset\n");
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116 | 36888c63 | Richard W.M. Jones | |
117 | 36888c63 | Richard W.M. Jones | qemu_del_timer(s->timer); |
118 | 36888c63 | Richard W.M. Jones | } |
119 | 36888c63 | Richard W.M. Jones | |
120 | 9dd986cc | Richard W.M. Jones | static WatchdogTimerModel model = {
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121 | 9dd986cc | Richard W.M. Jones | .wdt_name = "ib700",
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122 | 9dd986cc | Richard W.M. Jones | .wdt_description = "iBASE 700",
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123 | 9dd986cc | Richard W.M. Jones | }; |
124 | 9dd986cc | Richard W.M. Jones | |
125 | 8f04ee08 | Anthony Liguori | static void wdt_ib700_class_init(ObjectClass *klass, void *data) |
126 | 8f04ee08 | Anthony Liguori | { |
127 | 39bffca2 | Anthony Liguori | DeviceClass *dc = DEVICE_CLASS(klass); |
128 | db895a1e | Andreas Färber | |
129 | db895a1e | Andreas Färber | dc->realize = wdt_ib700_realize; |
130 | 39bffca2 | Anthony Liguori | dc->reset = wdt_ib700_reset; |
131 | 39bffca2 | Anthony Liguori | dc->vmsd = &vmstate_ib700; |
132 | 8f04ee08 | Anthony Liguori | } |
133 | 8f04ee08 | Anthony Liguori | |
134 | 8c43a6f0 | Andreas Färber | static const TypeInfo wdt_ib700_info = { |
135 | 61e477f4 | Andreas Färber | .name = TYPE_IB700, |
136 | 39bffca2 | Anthony Liguori | .parent = TYPE_ISA_DEVICE, |
137 | 39bffca2 | Anthony Liguori | .instance_size = sizeof(IB700State),
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138 | 39bffca2 | Anthony Liguori | .class_init = wdt_ib700_class_init, |
139 | 09aaa160 | Markus Armbruster | }; |
140 | 09aaa160 | Markus Armbruster | |
141 | 83f7d43a | Andreas Färber | static void wdt_ib700_register_types(void) |
142 | 9dd986cc | Richard W.M. Jones | { |
143 | 9dd986cc | Richard W.M. Jones | watchdog_add_model(&model); |
144 | 39bffca2 | Anthony Liguori | type_register_static(&wdt_ib700_info); |
145 | 9dd986cc | Richard W.M. Jones | } |
146 | 09aaa160 | Markus Armbruster | |
147 | 83f7d43a | Andreas Färber | type_init(wdt_ib700_register_types) |