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/**
* @file
* @ingroup sparc_leon2
* @brief Clock Tick Device Driver
*
* This routine initializes LEON timer 1 which used for the clock tick.
*
* The tick frequency is directly programmed to the configured number of
* microseconds per tick.
*/
/*
* COPYRIGHT (c) 1989-2008.
* On-Line Applications Research Corporation (OAR).
*
* Modified for LEON BSP
* COPYRIGHT (c) 2004.
* Gaisler Research.
*
* 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.
*/
#include <bsp.h>
#include <bspopts.h>
#include <rtems/timecounter.h>
#include <rtems/score/sparcimpl.h>
static rtems_timecounter_simple leon2_tc;
static uint32_t leon2_tc_get( rtems_timecounter_simple *tc )
{
return LEON_REG.Timer_Counter_1;
}
static bool leon2_tc_is_pending( rtems_timecounter_simple *tc )
{
return LEON_Is_interrupt_pending( LEON_INTERRUPT_TIMER1 );
}
static uint32_t leon2_tc_get_timecount( struct timecounter *tc )
{
return rtems_timecounter_simple_downcounter_get(
tc,
leon2_tc_get,
leon2_tc_is_pending
);
}
static void leon2_tc_at_tick( rtems_timecounter_simple *tc )
{
/* Nothing to do */
}
static void leon2_tc_tick( void )
{
rtems_timecounter_simple_downcounter_tick(
&leon2_tc,
leon2_tc_get,
leon2_tc_at_tick
);
}
/*
* The Real Time Clock Counter Timer uses this trap type.
*/
#define CLOCK_VECTOR LEON_TRAP_TYPE( LEON_INTERRUPT_TIMER1 )
#define Clock_driver_support_install_isr( _new ) \
set_vector( _new, CLOCK_VECTOR, 1 )
extern int CLOCK_SPEED;
#define Clock_driver_support_initialize_hardware() \
do { \
LEON_REG.Timer_Reload_1 = \
rtems_configuration_get_microseconds_per_tick() - 1; \
\
LEON_REG.Timer_Control_1 = ( \
LEON_REG_TIMER_COUNTER_ENABLE_COUNTING | \
LEON_REG_TIMER_COUNTER_RELOAD_AT_ZERO | \
LEON_REG_TIMER_COUNTER_LOAD_COUNTER \
); \
rtems_timecounter_simple_install( \
&leon2_tc, \
1000000, \
rtems_configuration_get_microseconds_per_tick(), \
leon2_tc_get_timecount \
); \
} while (0)
#define Clock_driver_support_shutdown_hardware() \
do { \
LEON_Mask_interrupt( LEON_INTERRUPT_TIMER1 ); \
LEON_REG.Timer_Control_1 = 0; \
} while (0)
#define Clock_driver_timecounter_tick() leon2_tc_tick()
#include "../../../shared/clockdrv_shell.h"
SPARC_COUNTER_DEFINITION;
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