1 | /* |
2 | * QEMU 8253/8254 interval timer emulation |
3 | * |
4 | * Copyright (c) 2003-2004 Fabrice Bellard |
5 | * |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
7 | * of this software and associated documentation files (the "Software"), to deal |
8 | * in the Software without restriction, including without limitation the rights |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
10 | * copies of the Software, and to permit persons to whom the Software is |
11 | * furnished to do so, subject to the following conditions: |
12 | * |
13 | * The above copyright notice and this permission notice shall be included in |
14 | * all copies or substantial portions of the Software. |
15 | * |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
22 | * THE SOFTWARE. |
23 | */ |
24 | |
25 | #ifndef HW_I8254_H |
26 | #define HW_I8254_H |
27 | |
28 | #include "hw/qdev-properties.h" |
29 | #include "hw/isa/isa.h" |
30 | |
31 | #define PIT_FREQ 1193182 |
32 | |
33 | typedef struct PITChannelInfo { |
34 | int gate; |
35 | int mode; |
36 | int initial_count; |
37 | int out; |
38 | } PITChannelInfo; |
39 | |
40 | #define TYPE_PIT_COMMON "pit-common" |
41 | #define PIT_COMMON(obj) \ |
42 | OBJECT_CHECK(PITCommonState, (obj), TYPE_PIT_COMMON) |
43 | #define PIT_COMMON_CLASS(klass) \ |
44 | OBJECT_CLASS_CHECK(PITCommonClass, (klass), TYPE_PIT_COMMON) |
45 | #define PIT_COMMON_GET_CLASS(obj) \ |
46 | OBJECT_GET_CLASS(PITCommonClass, (obj), TYPE_PIT_COMMON) |
47 | |
48 | #define TYPE_I8254 "isa-pit" |
49 | #define TYPE_KVM_I8254 "kvm-pit" |
50 | |
51 | static inline ISADevice *i8254_pit_init(ISABus *bus, int base, int isa_irq, |
52 | qemu_irq alt_irq) |
53 | { |
54 | DeviceState *dev; |
55 | ISADevice *d; |
56 | |
57 | d = isa_create(bus, TYPE_I8254); |
58 | dev = DEVICE(d); |
59 | qdev_prop_set_uint32(dev, "iobase" , base); |
60 | qdev_init_nofail(dev); |
61 | qdev_connect_gpio_out(dev, 0, |
62 | isa_irq >= 0 ? isa_get_irq(d, isa_irq) : alt_irq); |
63 | |
64 | return d; |
65 | } |
66 | |
67 | static inline ISADevice *kvm_pit_init(ISABus *bus, int base) |
68 | { |
69 | DeviceState *dev; |
70 | ISADevice *d; |
71 | |
72 | d = isa_create(bus, TYPE_KVM_I8254); |
73 | dev = DEVICE(d); |
74 | qdev_prop_set_uint32(dev, "iobase" , base); |
75 | qdev_init_nofail(dev); |
76 | |
77 | return d; |
78 | } |
79 | |
80 | void pit_set_gate(ISADevice *dev, int channel, int val); |
81 | void pit_get_channel_info(ISADevice *dev, int channel, PITChannelInfo *info); |
82 | |
83 | #endif /* HW_I8254_H */ |
84 | |