hw/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.h"
  29 #include "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 static 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
  54 void pit_set_gate(ISADevice *dev, int channel, int val);
  55 void pit_get_channel_info(ISADevice *dev, int channel, PITChannelInfo *info);
  56
  57 #endif /* !HW_I8254_H */