base-hw & imx31: use generic EPIT timer in core

Ref #577

base-hw/src/core/imx31/timer.h

@@ -15,14 +15,21 @@
 #define _IMX31__TIMER_H_
 
 /* core includes */
-#include <timer/imx31.h>
+#include <drivers/timer/epit_base.h>
 
 namespace Kernel
 {
-	/**
-	 * Kernel timer
-	 */
-	class Timer : public Imx31::Timer { };
+	class Timer : public Genode::Epit_base
+	{
+		public:
+
+			enum { IRQ = Genode::Board::EPIT_1_IRQ };
+
+			/**
+			 * Constructor
+			 */
+			Timer() : Genode::Epit_base(Genode::Board::EPIT_1_MMIO_BASE) { }
+	};
 }
 
 #endif /* _IMX31__TIMER_H_ */

base-hw/src/core/timer/imx31.h

@@ -1,176 +0,0 @@
-/*
- * \brief  Timer for core
- * \author Martin Stein
- * \author Norman Feske
- * \date   2012-08-30
- */
-
-/*
- * Copyright (C) 2012 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__IMX31_H_
-#define _TIMER__IMX31_H_
-
-/* Genode includes */
-#include <util/mmio.h>
-
-namespace Imx31
-{
-	using namespace Genode;
-
-	/**
-	 * Core timer
-	 */
-	class Timer : public Mmio
-	{
-		enum { TICS_PER_MS = 32 };
-
-		/**
-		 * Control register
-		 */
-		struct Cr : Register<0x0, 32>
-		{
-			struct En : Bitfield<0, 1> { }; /* enable timer */
-
-			struct En_mod : Bitfield<1, 1> /* reload or continue on enable */
-			{
-				enum { RELOAD = 1 };
-			};
-
-			struct Oci_en : Bitfield<2, 1> { }; /* interrupt on compare */
-
-			struct Rld : Bitfield<3, 1> /* reload or roll-over */
-			{
-				enum { RELOAD_FROM_LR = 1 };
-			};
-
-			struct Prescaler : Bitfield<4, 12> /* clock input divisor */
-			{
-				enum { DIVIDE_BY_1 = 0 };
-			};
-
-			struct Swr     : Bitfield<16, 1> { }; /* software reset bit */
-			struct Iovw    : Bitfield<17, 1> { }; /* enable overwrite */
-			struct Dbg_en  : Bitfield<18, 1> { }; /* enable in debug mode */
-			struct Wait_en : Bitfield<19, 1> { }; /* enable in wait mode */
-			struct Doz_en  : Bitfield<20, 1> { }; /* enable in doze mode */
-			struct Stop_en : Bitfield<21, 1> { }; /* enable in stop mode */
-
-			struct Om : Bitfield<22, 2> /* mode of the output pin */
-			{
-				enum { DISCONNECTED = 0 };
-			};
-
-			struct Clk_src : Bitfield<24, 2> /* select clock input */
-			{
-				enum { IPG_CLK_32K = 3 };
-			};
-
-			/**
-			 * Register value that configures the timer for a one-shot run
-			 */
-			static access_t prepare_one_shot()
-			{
-				return En::bits(0) |
-				       En_mod::bits(En_mod::RELOAD) |
-				       Oci_en::bits(1) |
-				       Rld::bits(Rld::RELOAD_FROM_LR) |
-				       Prescaler::bits(Prescaler::DIVIDE_BY_1) |
-				       Swr::bits(0) |
-				       Iovw::bits(0) |
-				       Dbg_en::bits(0) |
-				       Wait_en::bits(0) |
-				       Doz_en::bits(0) |
-				       Stop_en::bits(0) |
-				       Om::bits(Om::DISCONNECTED) |
-				       Clk_src::bits(Clk_src::IPG_CLK_32K);
-			}
-		};
-
-		/**
-		 * Status register
-		 */
-		struct Sr : Register<0x4, 32>
-		{
-			struct Ocif : Bitfield<0, 1> { }; /* IRQ status, write 1 clears */
-		};
-
-		struct Lr   : Register<0x8,  32> { }; /* load value register */
-		struct Cmpr : Register<0xc,  32> { }; /* compare value register */
-		struct Cnt  : Register<0x10, 32> { }; /* counter register */
-
-		/**
-		 * Disable timer and clear its interrupt output
-		 */
-		void _reset()
-		{
-			/* wait until ongoing reset operations are finished */
-			while (read<Cr::Swr>()) ;
-
-			/* disable timer */
-			write<Cr::En>(0);
-			clear_interrupt();
-		}
-
-		public:
-
-			enum { IRQ = Board::EPIT_1_IRQ };
-
-			/**
-			 * Constructor
-			 */
-			Timer() : Mmio(Board::EPIT_1_MMIO_BASE) { _reset(); }
-
-			/**
-			 * Start a one-shot run
-			 *
-			 * \param tics  native timer value used to assess the delay
-			 *              of the timer interrupt as of the call
-			 */
-			void start_one_shot(unsigned const tics)
-			{
-				/* stop timer */
-				_reset();
-
-				/* configure timer for a one-shot */
-				write<Cr>(Cr::prepare_one_shot());
-				write<Lr>(tics);
-				write<Cmpr>(0);
-
-				/* start timer */
-				write<Cr::En>(1);
-			}
-
-			/**
-			 * Stop the timer from a one-shot run
-			 *
-			 * \return  last native timer value of the one-shot run
-			 */
-			unsigned long stop_one_shot()
-			{
-				/* disable timer */
-				write<Cr::En>(0);
-
-				/* if the timer has hit zero already return 0 */
-				return read<Sr::Ocif>() ? 0 : read<Cnt>();
-			}
-
-			/**
-			 * Clear interrupt output line
-			 */
-			void clear_interrupt() { write<Sr::Ocif>(1); }
-
-			/**
-			 * Translate milliseconds to a native timer value
-			 */
-			static unsigned ms_to_tics(unsigned const ms) {
-				return TICS_PER_MS * ms; }
-	};
-}
-
-#endif /* _TIMER__IMX31_H_ */
-