include/hw/timer/i8254.h

   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 */