76 lines
1.4 KiB
C++
76 lines
1.4 KiB
C++
/*
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* \brief Timer for kernel
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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 _RPI__TIMER_H_
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#define _RPI__TIMER_H_
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/* Genode includes */
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#include <util/mmio.h>
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#include <base/stdint.h>
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#include <base/printf.h>
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#include <drivers/board_base.h>
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namespace Kernel { class Timer; }
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class Kernel::Timer : public Genode::Mmio
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{
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/*
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* The timer channel 0 apparently does not work on the Raspberry Pi.
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* So we use channel 1.
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*/
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struct Cs : Register<0x0, 32>
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{
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struct Status : Bitfield<1, 1> { };
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};
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struct Clo : Register<0x4, 32> { };
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struct Cmp : Register<0x10, 32> { };
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private:
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typedef Genode::uint32_t uint32_t;
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typedef Genode::Board_base Board_base;
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public:
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Timer() : Mmio(Board_base::SYSTEM_TIMER_MMIO_BASE) { }
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static unsigned interrupt_id(unsigned)
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{
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return Board_base::SYSTEM_TIMER_IRQ;
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}
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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::Status>(1);
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}
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static uint32_t ms_to_tics(unsigned const ms)
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{
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return (Board_base::SYSTEM_TIMER_CLOCK / 1000) * ms;
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}
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void clear_interrupt(unsigned)
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{
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write<Cs::Status>(1);
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read<Cs>();
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}
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};
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#endif /* _RPI__TIMER_H_ */
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