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 #include "qapi/error.h" 31 #include "qom/object.h" 32 33 #define PIT_FREQ 1193182 34 35 typedef struct PITChannelInfo { 36 int gate; 37 int mode; 38 int initial_count; 39 int out; 40 } PITChannelInfo; 41 42 #define TYPE_PIT_COMMON "pit-common" 43 OBJECT_DECLARE_TYPE(PITCommonState, PITCommonClass, PIT_COMMON) 44 45 #define TYPE_I8254 "isa-pit" 46 #define TYPE_KVM_I8254 "kvm-pit" 47 48 static inline ISADevice *i8254_pit_init(ISABus *bus, int base, int isa_irq, 49 qemu_irq alt_irq) 50 { 51 DeviceState *dev; 52 ISADevice *d; 53 54 d = isa_new(TYPE_I8254); 55 dev = DEVICE(d); 56 qdev_prop_set_uint32(dev, "iobase", base); 57 isa_realize_and_unref(d, bus, &error_fatal); 58 qdev_connect_gpio_out(dev, 0, 59 isa_irq >= 0 ? isa_bus_get_irq(bus, isa_irq) 60 : alt_irq); 61 62 return d; 63 } 64 65 static inline ISADevice *kvm_pit_init(ISABus *bus, int base) 66 { 67 DeviceState *dev; 68 ISADevice *d; 69 70 d = isa_new(TYPE_KVM_I8254); 71 dev = DEVICE(d); 72 qdev_prop_set_uint32(dev, "iobase", base); 73 isa_realize_and_unref(d, bus, &error_fatal); 74 75 return d; 76 } 77 78 void pit_set_gate(ISADevice *dev, int channel, int val); 79 void pit_get_channel_info(ISADevice *dev, int channel, PITChannelInfo *info); 80 81 #endif /* HW_I8254_H */ 82