pit.h

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/*
 * Copyright (c) 2014, Michael Müller
 * Copyright (c) 2014, Sebastian Lackner
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#ifndef _H_PIT_
#define _H_PIT_

#ifdef __KERNEL__

    #include <stdbool.h>
    #include <stdint.h>

    #define PIT_MODE_INTERRUPT_ON_TERMINAL  0
    #define PIT_MODE_ONE_SHOT               1
    #define PIT_MODE_RATE_GENERATOR         2
    #define PIT_MODE_SQUARE_WAVE_GENERATOR  3
    #define PIT_MODE_SOFTWARE_STROBE        4
    #define PIT_MODE_HARDWARE_STROBE        5

    #define PIT_CHANNEL_BASE    0x40
    #define PIT_CHANNEL0_PORT   (PIT_CHANNEL_BASE)
    #define PIT_CHANNEL1_PORT   (PIT_CHANNEL_BASE+1)
    #define PIT_CHANNEL2_PORT   (PIT_CHANNEL_BASE+2)
    #define PIT_MODE_PORT       0x43

    #define PIT_BINARY 0
    #define PIT_BCD    1

    #define PIT_INTERNAL    0
    #define PIT_LSB         1
    #define PIT_MSB         2
    #define PIT_LSB_MSB     3

    #define PIT_CONTROL_VALUE(FORMAT, MODE, REGISTER, CHANNEL) \
        ((CHANNEL) << 6 | (REGISTER) << 4 | (MODE) << 1 | FORMAT)

    #define PIT_CHANNEL_COUNT   3
    #define PIT_FREQUENCY       1193182

    void pitSetValue(uint32_t channel, uint32_t mode, uint16_t value);
    void pitSetFrequency(uint32_t channel, uint32_t frequency);

#endif

#endif /* _H_PIT_ */