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/hw.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_I8254 "isa-pit" 41 #define TYPE_KVM_I8254 "kvm-pit" 42 43 static inline ISADevice *pit_init(ISABus *bus, int base, int isa_irq, 44 qemu_irq alt_irq) 45 { 46 DeviceState *dev; 47 ISADevice *d; 48 49 d = isa_create(bus, TYPE_I8254); 50 dev = DEVICE(d); 51 qdev_prop_set_uint32(dev, "iobase", base); 52 qdev_init_nofail(dev); 53 qdev_connect_gpio_out(dev, 0, 54 isa_irq >= 0 ? isa_get_irq(d, isa_irq) : alt_irq); 55 56 return d; 57 } 58 59 static inline ISADevice *kvm_pit_init(ISABus *bus, int base) 60 { 61 DeviceState *dev; 62 ISADevice *d; 63 64 d = isa_create(bus, TYPE_KVM_I8254); 65 dev = DEVICE(d); 66 qdev_prop_set_uint32(dev, "iobase", base); 67 qdev_init_nofail(dev); 68 69 return d; 70 } 71 72 void pit_set_gate(ISADevice *dev, int channel, int val); 73 void pit_get_channel_info(ISADevice *dev, int channel, PITChannelInfo *info); 74 75 #endif /* !HW_I8254_H */ 76