52 lines
1.0 KiB
C++
52 lines
1.0 KiB
C++
/*
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* \brief Timer implementation specific to Rpi
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* \author Norman Feske
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* \author Stefan Kalkowski
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* \date 2016-01-07
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*/
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/*
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* Copyright (C) 2016-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#include <platform.h>
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#include <timer.h>
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using namespace Genode;
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using Kernel::time_t;
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Timer::Timer()
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: Mmio(Platform::mmio_to_virt(Board::SYSTEM_TIMER_MMIO_BASE)) { }
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void Timer::start_one_shot(time_t const tics, unsigned const)
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{
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write<Cs::M1>(1);
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read<Cs>();
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write<Clo>(0);
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write<Cmp>(read<Clo>() + tics);
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}
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time_t Timer::tics_to_us(time_t const tics) const {
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return (tics / TICS_PER_MS) * 1000; }
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time_t Timer::us_to_tics(time_t const us) const {
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return (us / 1000) * TICS_PER_MS; }
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time_t Timer::max_value() { return (Clo::access_t)~0; }
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time_t Timer::value(unsigned const)
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{
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Cmp::access_t const cmp = read<Cmp>();
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Clo::access_t const clo = read<Clo>();
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return cmp > clo ? cmp - clo : 0;
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}
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