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90 lines
2.4 KiB
C
90 lines
2.4 KiB
C
/*
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* Clock Tick Device Driver
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*
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* This routine initializes the Real Time Clock Counter Timer which is
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* part of the MEC on the ERC32 CPU.
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*
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* The tick frequency is directly programmed to the configured number of
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* microseconds per tick.
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*
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* COPYRIGHT (c) 1989-2006.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.com/license/LICENSE.
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*
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* Ported to ERC32 implementation of the SPARC by On-Line Applications
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* Research Corporation (OAR) under contract to the European Space
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* Agency (ESA).
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*
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* ERC32 modifications of respective RTEMS file: COPYRIGHT (c) 1995.
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* European Space Agency.
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*
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* $Id$
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*/
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#include <bsp.h>
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#include <bspopts.h>
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#if SIMSPARC_FAST_IDLE==1
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#define CLOCK_DRIVER_USE_FAST_IDLE
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#endif
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/*
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* The Real Time Clock Counter Timer uses this trap type.
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*/
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#define CLOCK_VECTOR ERC32_TRAP_TYPE( ERC32_INTERRUPT_REAL_TIME_CLOCK )
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#define Clock_driver_support_at_tick()
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#define Clock_driver_support_install_isr( _new, _old ) \
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do { \
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_old = set_vector( _new, CLOCK_VECTOR, 1 ); \
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} while(0)
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extern int CLOCK_SPEED;
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uint32_t bsp_clock_nanoseconds_since_last_tick(void)
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{
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uint32_t clicks;
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clicks = ERC32_MEC.Real_Time_Clock_Counter;
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return (uint32_t) (BSP_Configuration.microseconds_per_tick - clicks) * 1000;
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}
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#define Clock_driver_nanoseconds_since_last_tick bsp_clock_nanoseconds_since_last_tick
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#define Clock_driver_support_initialize_hardware() \
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do { \
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/* approximately 1 us per countdown */ \
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ERC32_MEC.Real_Time_Clock_Scalar = CLOCK_SPEED - 1; \
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ERC32_MEC.Real_Time_Clock_Counter = \
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BSP_Configuration.microseconds_per_tick; \
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\
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ERC32_MEC_Set_Real_Time_Clock_Timer_Control( \
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ERC32_MEC_TIMER_COUNTER_ENABLE_COUNTING | \
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ERC32_MEC_TIMER_COUNTER_LOAD_SCALER | \
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ERC32_MEC_TIMER_COUNTER_LOAD_COUNTER \
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); \
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\
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ERC32_MEC_Set_Real_Time_Clock_Timer_Control( \
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ERC32_MEC_TIMER_COUNTER_ENABLE_COUNTING | \
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ERC32_MEC_TIMER_COUNTER_RELOAD_AT_ZERO \
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); \
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} while (0)
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#define Clock_driver_support_shutdown_hardware() \
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do { \
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ERC32_Mask_interrupt( ERC32_INTERRUPT_REAL_TIME_CLOCK ); \
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\
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ERC32_MEC_Set_Real_Time_Clock_Timer_Control( \
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ERC32_MEC_TIMER_COUNTER_DISABLE_COUNTING \
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); \
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} while (0)
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#include "../../../shared/clockdrv_shell.c"
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