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/qdev.h"
  30 #include "hw/isa/isa.h"
  31
  32 #define PIT_FREQ 1193182
  33
  34 typedef struct PITChannelInfo {
  35     int gate;
  36     int mode;
  37     int initial_count;
  38     int out;
  39 } PITChannelInfo;
  40
  41 #define TYPE_PIT_COMMON "pit-common"
  42 #define PIT_COMMON(obj) \
  43      OBJECT_CHECK(PITCommonState, (obj), TYPE_PIT_COMMON)
  44 #define PIT_COMMON_CLASS(klass) \
  45      OBJECT_CLASS_CHECK(PITCommonClass, (klass), TYPE_PIT_COMMON)
  46 #define PIT_COMMON_GET_CLASS(obj) \
  47      OBJECT_GET_CLASS(PITCommonClass, (obj), TYPE_PIT_COMMON)
  48
  49 #define TYPE_I8254 "isa-pit"
  50 #define TYPE_KVM_I8254 "kvm-pit"
  51
  52 static inline ISADevice *i8254_pit_init(ISABus *bus, int base, int isa_irq,
  53                                         qemu_irq alt_irq)
  54 {
  55     DeviceState *dev;
  56     ISADevice *d;
  57
  58     d = isa_create(bus, TYPE_I8254);
  59     dev = DEVICE(d);
  60     qdev_prop_set_uint32(dev, "iobase", base);
  61     qdev_init_nofail(dev);
  62     qdev_connect_gpio_out(dev, 0,
  63                           isa_irq >= 0 ? isa_get_irq(d, isa_irq) : alt_irq);
  64
  65     return d;
  66 }
  67
  68 static inline ISADevice *kvm_pit_init(ISABus *bus, int base)
  69 {
  70     DeviceState *dev;
  71     ISADevice *d;
  72
  73     d = isa_create(bus, TYPE_KVM_I8254);
  74     dev = DEVICE(d);
  75     qdev_prop_set_uint32(dev, "iobase", base);
  76     qdev_init_nofail(dev);
  77
  78     return d;
  79 }
  80
  81 void pit_set_gate(ISADevice *dev, int channel, int val);
  82 void pit_get_channel_info(ISADevice *dev, int channel, PITChannelInfo *info);
  83
  84 #endif /* HW_I8254_H */