path: root/hw/i8254.h

/*
 * QEMU 8253/8254 interval timer emulation
 *
 * Copyright (c) 2003-2004 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#ifndef HW_I8254_H
#define HW_I8254_H

#include "hw.h"
#include "isa.h"

#define PIT_FREQ 1193182

typedef struct PITChannelInfo {
    int gate;
    int mode;
    int initial_count;
    int out;
} PITChannelInfo;

static inline ISADevice *pit_init(ISABus *bus, int base, int isa_irq,
                                  qemu_irq alt_irq)
{
    ISADevice *dev;

    dev = isa_create(bus, "isa-pit");
    qdev_prop_set_uint32(&dev->qdev, "iobase", base);
    qdev_init_nofail(&dev->qdev);
    qdev_connect_gpio_out(&dev->qdev, 0,
                          isa_irq >= 0 ? isa_get_irq(dev, isa_irq) : alt_irq);

    return dev;
}

void pit_set_gate(ISADevice *dev, int channel, int val);
void pit_get_channel_info(ISADevice *dev, int channel, PITChannelInfo *info);

#endif /* !HW_I8254_H */