genode/repos/base-hw/src/core/include/spec/rpi/timer.h

79 lines
1.3 KiB
C++

/*
* \brief Timer driver for core
* \author Norman Feske
* \date 2013-04-05
*/
/*
* Copyright (C) 2013 Genode Labs GmbH
*
* This file is part of the Genode OS framework, which is distributed
* under the terms of the GNU General Public License version 2.
*/
#ifndef _TIMER_H_
#define _TIMER_H_
/* Genode includes */
#include <util/mmio.h>
/* core includes */
#include <board.h>
namespace Genode
{
/**
* Timer driver for core
*/
class Timer;
}
class Genode::Timer : public Mmio
{
private:
/*
* The timer channel 0 apparently does not work on the Raspberry Pi.
* So we use channel 1.
*/
struct Cs : Register<0x0, 32>
{
struct Status : Bitfield<1, 1> { };
};
struct Clo : Register<0x4, 32> { };
struct Cmp : Register<0x10, 32> { };
public:
Timer() : Mmio(Board::SYSTEM_TIMER_MMIO_BASE) { }
static unsigned interrupt_id(unsigned)
{
return Board::SYSTEM_TIMER_IRQ;
}
inline void start_one_shot(uint32_t const tics, unsigned)
{
write<Clo>(0);
write<Cmp>(read<Clo>() + tics);
write<Cs::Status>(1);
}
static uint32_t ms_to_tics(unsigned const ms)
{
return (Board::SYSTEM_TIMER_CLOCK / 1000) * ms;
}
void clear_interrupt(unsigned)
{
write<Cs::Status>(1);
read<Cs>();
}
};
namespace Kernel { class Timer : public Genode::Timer { }; }
#endif /* _TIMER_H_ */