61 lines
1.3 KiB
C++
61 lines
1.3 KiB
C++
/*
|
|
* \brief Timer driver for core
|
|
* \author Stefan Kalkowski
|
|
* \date 2019-05-10
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2019 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU Affero General Public License version 3.
|
|
*/
|
|
|
|
#include <drivers/timer/util.h>
|
|
#include <kernel/timer.h>
|
|
#include <kernel/cpu.h>
|
|
|
|
using namespace Kernel;
|
|
|
|
|
|
unsigned Timer::interrupt_id() const { return Board::TIMER_IRQ; }
|
|
|
|
|
|
unsigned long Board::Timer::_freq() { return Genode::Cpu::Cntfrq::read(); }
|
|
|
|
|
|
Board::Timer::Timer(unsigned) : ticks_per_ms(_freq() / 1000)
|
|
{
|
|
Cpu::Cntp_ctl::access_t ctl = 0;
|
|
Cpu::Cntp_ctl::Enable::set(ctl, 1);
|
|
Cpu::Cntp_ctl::write(ctl);
|
|
}
|
|
|
|
|
|
void Timer::_start_one_shot(time_t const ticks)
|
|
{
|
|
_device.last_time = Cpu::Cntpct::read();
|
|
Cpu::Cntp_tval::write(ticks);
|
|
Cpu::Cntp_ctl::access_t ctl = Cpu::Cntp_ctl::read();
|
|
Cpu::Cntp_ctl::Istatus::set(ctl, 0);
|
|
Cpu::Cntp_ctl::write(ctl);
|
|
}
|
|
|
|
|
|
time_t Timer::_duration() const
|
|
{
|
|
return Cpu::Cntpct::read() - _device.last_time;
|
|
}
|
|
|
|
|
|
time_t Timer::ticks_to_us(time_t const ticks) const {
|
|
return Genode::timer_ticks_to_us(ticks, _device.ticks_per_ms); }
|
|
|
|
|
|
time_t Timer::us_to_ticks(time_t const us) const {
|
|
return (us / 1000) * _device.ticks_per_ms; }
|
|
|
|
|
|
time_t Timer::_max_value() const {
|
|
return _device.ticks_per_ms * 5000; }
|