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.h" 29 #include "isa.h" 30 31 #define PIT_FREQ 1193182 32 33 static inline ISADevice *pit_init(ISABus *bus, int base, int isa_irq, 34 qemu_irq alt_irq) 35 { 36 ISADevice *dev; 37 38 dev = isa_create(bus, "isa-pit"); 39 qdev_prop_set_uint32(&dev->qdev, "iobase", base); 40 qdev_init_nofail(&dev->qdev); 41 qdev_connect_gpio_out(&dev->qdev, 0, 42 isa_irq >= 0 ? isa_get_irq(dev, isa_irq) : alt_irq); 43 44 return dev; 45 } 46 47 void pit_set_gate(ISADevice *dev, int channel, int val); 48 int pit_get_gate(ISADevice *dev, int channel); 49 int pit_get_initial_count(ISADevice *dev, int channel); 50 int pit_get_mode(ISADevice *dev, int channel); 51 int pit_get_out(ISADevice *dev, int channel, int64_t current_time); 52 53 void hpet_pit_disable(void); 54 void hpet_pit_enable(void); 55 56 #endif /* !HW_I8254_H */ 57