81 lines
1.8 KiB
C++
81 lines
1.8 KiB
C++
/*
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* \brief Timer driver for core
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* \author Stefan Kalkowski
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* \author Martin Stein
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* \date 2012-04-23
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*/
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/*
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* Copyright (C) 2012-2017 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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/* core includes */
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#include <kernel/timer.h>
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#include <board.h>
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#include <platform.h>
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#include <drivers/timer/util.h>
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using namespace Genode;
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using namespace Kernel;
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unsigned Timer::interrupt_id() const { return Board::EPIT_1_IRQ; }
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Board::Timer::Timer(unsigned)
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: Mmio(Platform::mmio_to_virt(Board::EPIT_1_MMIO_BASE))
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{
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reset();
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Cr::access_t cr = read<Cr>();
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Cr::En_mod::set(cr, Cr::En_mod::RELOAD);
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Cr::Oci_en::set(cr, 1);
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Cr::Prescaler::set(cr, Cr::Prescaler::DIVIDE_BY_1);
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Cr::Clk_src::set(cr, Cr::Clk_src::HIGH_FREQ_REF_CLK);
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Cr::Iovw::set(cr, 1);
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write<Cr>(cr);
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write<Cmpr>(0xffffffff);
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write<Cr::En>(1);
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write<Lr>(0xffffffff);
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}
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void Timer::_start_one_shot(time_t const ticks)
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{
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/*
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* First unset the interrupt flag,
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* otherwise if the tick is small enough, we loose an interrupt
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*/
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_device.write<Board::Timer::Sr::Ocif>(1);
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_device.write<Board::Timer::Lr>(ticks - 1);
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}
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time_t Timer::ticks_to_us(time_t const ticks) const {
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return timer_ticks_to_us(ticks, Board::Timer::TICS_PER_MS); }
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time_t Timer::us_to_ticks(time_t const us) const {
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return (us / 1000UL) * Board::Timer::TICS_PER_MS; }
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time_t Timer::_max_value() const {
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return 0xffffffff; }
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time_t Timer::_duration() const
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{
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using Device = Board::Timer;
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Device::Cnt::access_t last = _last_timeout_duration;
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Device::Cnt::access_t cnt = _device.read<Device::Cnt>();
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Device::Cnt::access_t ret = (_device.read<Device::Sr::Ocif>())
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? _max_value() - cnt + last : last - cnt;
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return ret;
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}
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