68 lines
1.3 KiB
C
68 lines
1.3 KiB
C
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/*
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* \brief Timer implementation specific to Cortex A9
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* \author Martin stein
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* \date 2011-12-13
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*/
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/*
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* Copyright (C) 2011-2017 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 _TIMER_DRIVER_H_
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#define _TIMER_DRIVER_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 Kernel { class Timer_driver; }
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/**
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* Timer driver for core
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*/
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struct Kernel::Timer_driver : Genode::Mmio
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{
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enum {
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TICS_PER_MS =
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Board::CORTEX_A9_PRIVATE_TIMER_CLK /
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Board::CORTEX_A9_PRIVATE_TIMER_DIV / 1000
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};
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/**
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* Load value register
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*/
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struct Load : Register<0x0, 32> { };
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/**
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* Counter value register
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*/
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struct Counter : Register<0x4, 32> { };
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/**
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* Timer control register
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*/
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struct Control : Register<0x8, 32>
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{
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struct Timer_enable : Bitfield<0,1> { }; /* enable counting */
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struct Irq_enable : Bitfield<2,1> { }; /* unmask interrupt */
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struct Prescaler : Bitfield<8,8> { };
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};
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/**
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* Timer interrupt status register
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*/
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struct Interrupt_status : Register<0xc, 32>
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{
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struct Event : Bitfield<0,1> { }; /* if counter hit zero */
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};
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Timer_driver(unsigned);
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};
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#endif /* _TIMER_DRIVER_H_ */
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