74 lines
1.4 KiB
C++
74 lines
1.4 KiB
C++
/*
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* \brief Timer driver for core
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* \author Norman Feske
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* \date 2013-04-05
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*/
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/*
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* Copyright (C) 2013 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 General Public License version 2.
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*/
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#ifndef _TIMER_H_
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#define _TIMER_H_
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/* Genode includes */
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#include <util/mmio.h>
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/* core includes */
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#include <board.h>
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namespace Genode
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{
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/**
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* Timer driver for core
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*
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* Timer channel 0 apparently doesn't work on the RPI, so we use channel 1
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*/
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class Timer;
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}
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class Genode::Timer : public Mmio
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{
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private:
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struct Cs : Register<0x0, 32> { struct M1 : Bitfield<1, 1> { }; };
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struct Clo : Register<0x4, 32> { };
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struct Cmp : Register<0x10, 32> { };
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public:
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Timer() : Mmio(Board::SYSTEM_TIMER_MMIO_BASE) { }
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static unsigned interrupt_id(int) { return Board::SYSTEM_TIMER_IRQ; }
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inline void start_one_shot(uint32_t const tics, unsigned)
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{
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write<Clo>(0);
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write<Cmp>(read<Clo>() + tics);
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write<Cs::M1>(1);
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}
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static uint32_t ms_to_tics(unsigned const ms) {
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return (Board::SYSTEM_TIMER_CLOCK / 1000) * ms; }
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void clear_interrupt(unsigned)
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{
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write<Cs::M1>(1);
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read<Cs>();
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}
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unsigned value(unsigned)
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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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};
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namespace Kernel { class Timer : public Genode::Timer { }; }
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#endif /* _TIMER_H_ */
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