LXR qemu/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
  33typedef 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
  43static 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
  59static 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
  72void pit_set_gate(ISADevice *dev, int channel, int val);
  73void pit_get_channel_info(ISADevice *dev, int channel, PITChannelInfo *info);
  74
  75#endif /* !HW_I8254_H */
  76