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/**
* @file
* @ingroup sparc_leon2
* @brief Clock Tick Device Driver
*/
/*
* 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>
#if SIMSPARC_FAST_IDLE==1
#define CLOCK_DRIVER_USE_FAST_IDLE 1
#endif
/*
* The Real Time Clock Counter Timer uses this trap type.
*/
#define CLOCK_VECTOR LEON_TRAP_TYPE( LEON_INTERRUPT_TIMER1 )
#define Clock_driver_support_at_tick()
#define Clock_driver_support_install_isr( _new, _old ) \
do { \
_old = set_vector( _new, CLOCK_VECTOR, 1 ); \
} while(0)
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 \
); \
} while (0)
#define Clock_driver_support_shutdown_hardware() \
do { \
LEON_Mask_interrupt( LEON_INTERRUPT_TIMER1 ); \
LEON_REG.Timer_Control_1 = 0; \
} while (0)
static uint32_t bsp_clock_nanoseconds_since_last_tick(void)
{
uint32_t clicks;
uint32_t usecs;
clicks = LEON_REG.Timer_Counter_1;
if ( LEON_Is_interrupt_pending( LEON_INTERRUPT_TIMER1 ) ) {
clicks = LEON_REG.Timer_Counter_1;
usecs = (2*rtems_configuration_get_microseconds_per_tick() - clicks);
} else {
usecs = (rtems_configuration_get_microseconds_per_tick() - clicks);
}
return usecs * 1000;
}
#define Clock_driver_nanoseconds_since_last_tick bsp_clock_nanoseconds_since_last_tick
#include "../../../shared/clockdrv_shell.h"
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