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
  40static 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
  54static 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
  65void pit_set_gate(ISADevice *dev, int channel, int val);
  66void pit_get_channel_info(ISADevice *dev, int channel, PITChannelInfo *info);
  67
  68#endif /* !HW_I8254_H */
  69