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