77 lines
1.9 KiB
C++
77 lines
1.9 KiB
C++
/*
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* \brief Time source that uses the General Purpose Timer (Freescale)
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* \author Stefan Kalkowski
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* \date 2019-04-13
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*/
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/*
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* Copyright (C) 2019 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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#ifndef _TIME_SOURCE_H_
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#define _TIME_SOURCE_H_
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/* Genode includes */
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#include <irq_session/connection.h>
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#include <os/attached_mmio.h>
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#include <drivers/timer/util.h>
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/* local includes */
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#include <signalled_time_source.h>
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namespace Timer { class Time_source; }
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class Timer::Time_source : private Genode::Attached_mmio,
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public Genode::Signalled_time_source
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{
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private:
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enum { TICKS_PER_MS = 500 };
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struct Cr : Register<0x0, 32>
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{
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struct En : Bitfield<0, 1> { };
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struct En_mod : Bitfield<1, 1> { };
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struct Clk_src : Bitfield<6, 3> { enum { HIGH_FREQ_REF_CLK = 2 }; };
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struct Frr : Bitfield<9, 1> { };
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struct Swr : Bitfield<15, 1> { };
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};
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struct Pr : Register<0x4, 32> { };
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struct Sr : Register<0x8, 32> { };
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struct Ir : Register<0xc, 32> { };
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struct Ocr1 : Register<0x10, 32> { };
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struct Ocr2 : Register<0x14, 32> { };
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struct Ocr3 : Register<0x18, 32> { };
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struct Icr1 : Register<0x1c, 32> { };
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struct Icr2 : Register<0x20, 32> { };
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struct Cnt : Register<0x24, 32> { };
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Genode::Irq_connection _timer_irq;
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Genode::Duration _curr_time { Genode::Microseconds(0) };
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Cnt::access_t _last_cnt { 0 };
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void _initialize();
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public:
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Time_source(Genode::Env &env);
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/*************************
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** Genode::Time_source **
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*************************/
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Genode::Duration curr_time() override;
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void schedule_timeout(Genode::Microseconds duration,
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Timeout_handler &handler) override;
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Genode::Microseconds max_timeout() const override;
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};
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#endif /* _TIME_SOURCE_H_ */
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