BroadcomTimer.cpp

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/*
 * Copyright (C) 2015 Niek Linnenbank
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "BroadcomInterrupt.h"
#include "BroadcomTimer.h"
 
BroadcomTimer::Result BroadcomTimer::setFrequency(Size hertz)
{
    m_cycles = BCM_SYSTIMER_FREQ / hertz;
    m_frequency = hertz;
    m_int = BCM_IRQ_SYSTIMERM1;
 
    // Use timer slot 1. Enable.
    m_io.write(SYSTIMER_C1, m_io.read(SYSTIMER_CLO) + m_cycles);
    m_io.write(SYSTIMER_CS, m_io.read(SYSTIMER_CS) | (1 << M1));
 
    // Done
    return Success;
}
 
BroadcomTimer::Result BroadcomTimer::tick()
{
    // Clear+acknowledge the timer interrupt
    m_io.write(SYSTIMER_CS, m_io.read(SYSTIMER_CS) | (1 << M1));
    m_io.write(SYSTIMER_C1, m_io.read(SYSTIMER_CLO) + m_cycles);
 
    // Done
    return Timer::tick();;
}