79 lines
2.1 KiB
C++
79 lines
2.1 KiB
C++
/*
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* \brief Time source that uses the Enhanced Periodic Interrupt Timer (Freescale)
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* \author Norman Feske
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* \author Martin Stein
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* \author Stefan Kalkowski
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* \date 2009-06-16
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*/
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/*
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* Copyright (C) 2009-2017 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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#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 : public 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 = 66000 };
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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> { enum { RELOAD = 1 }; };
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struct Oci_en : Bitfield<2, 1> { };
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struct Swr : Bitfield<16, 1> { };
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struct Clk_src : Bitfield<24, 2> { enum { HIGH_FREQ_REF_CLK = 2 }; };
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static access_t prepare_one_shot()
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{
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access_t cr = 0;
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En_mod::set(cr, En_mod::RELOAD);
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Oci_en::set(cr, 1);
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Clk_src::set(cr, Clk_src::HIGH_FREQ_REF_CLK);
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return cr;
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}
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};
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struct Sr : Register<0x4, 32> { struct Ocif : Bitfield<0, 1> { }; };
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struct Cmpr : Register<0xc, 32> { };
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struct Cnt : Register<0x10, 32> { enum { MAX = ~(access_t)0 }; };
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Genode::Irq_connection _timer_irq;
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Genode::Duration _curr_time { Genode::Microseconds(0) };
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Genode::Microseconds const _max_timeout { Genode::timer_ticks_to_us(Cnt::MAX / 2, TICKS_PER_MS) };
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unsigned long _cleared_ticks { 0 };
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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, Timeout_handler &handler) override;
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Genode::Microseconds max_timeout() const override { return _max_timeout; };
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};
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#endif /* _TIME_SOURCE_H_ */
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