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/*
* This routine initializes the Real Time Clock Counter Timer which is
* part of the MEC on the ERC32 CPU.
*
* The tick frequency is directly programmed to the configured number of
* microseconds per tick.
*/
/*
* COPYRIGHT (c) 1989-2008.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*
* Ported to ERC32 implementation of the SPARC by On-Line Applications
* Research Corporation (OAR) under contract to the European Space
* Agency (ESA).
*
* ERC32 modifications of respective RTEMS file: COPYRIGHT (c) 1995.
* European Space Agency.
*/
#include <bsp.h>
#include <bspopts.h>
#include <rtems/counter.h>
#include <rtems/timecounter.h>
#include <rtems/score/sparcimpl.h>
#define ERC32_REAL_TIME_CLOCK_FREQUENCY 1000000
/*
* The Real Time Clock Counter Timer uses this trap type.
*/
#define CLOCK_VECTOR ERC32_TRAP_TYPE( ERC32_INTERRUPT_REAL_TIME_CLOCK )
#define Clock_driver_support_install_isr( _new ) \
set_vector( _new, CLOCK_VECTOR, 1 )
#define Clock_driver_support_set_interrupt_affinity( _online_processors ) \
do { \
(void) _online_processors; \
} while (0)
extern int CLOCK_SPEED;
static rtems_timecounter_simple erc32_tc;
static uint32_t erc32_tc_get( rtems_timecounter_simple *tc )
{
return ERC32_MEC.Real_Time_Clock_Counter;
}
static bool erc32_tc_is_pending( rtems_timecounter_simple *tc )
{
return ERC32_Is_interrupt_pending( ERC32_INTERRUPT_REAL_TIME_CLOCK );
}
static uint32_t erc32_tc_get_timecount( struct timecounter *tc )
{
return rtems_timecounter_simple_downcounter_get(
tc,
erc32_tc_get,
erc32_tc_is_pending
);
}
static void erc32_tc_at_tick( rtems_timecounter_simple *tc )
{
/* Nothing to do */
}
static void erc32_tc_tick( void )
{
rtems_timecounter_simple_downcounter_tick(
&erc32_tc,
erc32_tc_get,
erc32_tc_at_tick
);
}
static void erc32_counter_initialize( void )
{
_SPARC_Counter_initialize(
_SPARC_Counter_read_address,
_SPARC_Counter_difference_clock_period,
&ERC32_MEC.Real_Time_Clock_Counter
);
}
uint32_t _CPU_Counter_frequency(void)
{
return ERC32_REAL_TIME_CLOCK_FREQUENCY;
}
#define Clock_driver_support_initialize_hardware() \
do { \
/* approximately 1 us per countdown */ \
ERC32_MEC.Real_Time_Clock_Scalar = CLOCK_SPEED - 1; \
ERC32_MEC.Real_Time_Clock_Counter = \
rtems_configuration_get_microseconds_per_tick(); \
\
ERC32_MEC_Set_Real_Time_Clock_Timer_Control( \
ERC32_MEC_TIMER_COUNTER_ENABLE_COUNTING | \
ERC32_MEC_TIMER_COUNTER_LOAD_SCALER | \
ERC32_MEC_TIMER_COUNTER_LOAD_COUNTER \
); \
\
ERC32_MEC_Set_Real_Time_Clock_Timer_Control( \
ERC32_MEC_TIMER_COUNTER_ENABLE_COUNTING | \
ERC32_MEC_TIMER_COUNTER_RELOAD_AT_ZERO \
); \
rtems_timecounter_simple_install( \
&erc32_tc, \
ERC32_REAL_TIME_CLOCK_FREQUENCY, \
rtems_configuration_get_microseconds_per_tick(), \
erc32_tc_get_timecount \
); \
erc32_counter_initialize(); \
} while (0)
#define Clock_driver_timecounter_tick() erc32_tc_tick()
#include "../../../shared/dev/clock/clockimpl.h"
SPARC_COUNTER_DEFINITION;
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