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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 <rtems/irq-extension.h>
#include <rtems/sysinit.h>
#include <rtems/timecounter.h>
#include <bsp/sparc-counter.h>
extern int CLOCK_SPEED;
#define ERC32_REAL_TIME_CLOCK_FREQUENCY 1000000
static struct timecounter erc32_tc;
static void erc32_clock_init( void )
{
struct timecounter *tc;
tc = &erc32_tc;
tc->tc_get_timecount = _SPARC_Get_timecount_clock;
tc->tc_counter_mask = 0xffffffff;
tc->tc_frequency = ERC32_REAL_TIME_CLOCK_FREQUENCY;
tc->tc_quality = RTEMS_TIMECOUNTER_QUALITY_CLOCK_DRIVER;
rtems_timecounter_install(tc);
}
uint32_t _CPU_Counter_frequency( void )
{
return ERC32_REAL_TIME_CLOCK_FREQUENCY;
}
static void erc32_clock_at_tick( SPARC_Counter *counter )
{
rtems_interrupt_level level;
rtems_interrupt_local_disable(level);
ERC32_Clear_interrupt( ERC32_INTERRUPT_REAL_TIME_CLOCK );
counter->accumulated += counter->interval;
rtems_interrupt_local_enable(level);
}
static void erc32_clock_initialize_early( void )
{
SPARC_Counter *counter;
/* 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
);
counter = &_SPARC_Counter;
counter->read_isr_disabled = _SPARC_Counter_read_clock_isr_disabled;
counter->read = _SPARC_Counter_read_clock;
counter->counter_register = &ERC32_MEC.Real_Time_Clock_Counter,
counter->pending_register = &ERC32_MEC.Interrupt_Pending;
counter->pending_mask = UINT32_C(1) << ERC32_INTERRUPT_REAL_TIME_CLOCK;
counter->accumulated = rtems_configuration_get_microseconds_per_tick();
counter->interval = rtems_configuration_get_microseconds_per_tick();
}
RTEMS_SYSINIT_ITEM(
erc32_clock_initialize_early,
RTEMS_SYSINIT_CPU_COUNTER,
RTEMS_SYSINIT_ORDER_FIRST
);
/*
* 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 ) \
(void) rtems_interrupt_handler_install( \
ERC32_INTERRUPT_REAL_TIME_CLOCK, \
"Clock", \
RTEMS_INTERRUPT_SHARED, \
_new, \
&_SPARC_Counter \
)
#define Clock_driver_support_set_interrupt_affinity( _online_processors ) \
do { \
(void) _online_processors; \
} while (0)
#define Clock_driver_support_at_tick(arg) erc32_clock_at_tick(arg)
#define Clock_driver_support_initialize_hardware() erc32_clock_init()
#include "../../../shared/dev/clock/clockimpl.h"
SPARC_COUNTER_DEFINITION;
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