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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/sysinit.h>
#include <rtems/timecounter.h>
#include <rtems/score/sparcimpl.h>
extern int CLOCK_SPEED;
#define LEON2_TIMER_1_FREQUENCY 1000000
static struct timecounter leon2_tc;
static void leon2_clock_init( void )
{
struct timecounter *tc;
tc = &leon2_tc;
tc->tc_get_timecount = _SPARC_Get_timecount_clock;
tc->tc_counter_mask = 0xffffffff;
tc->tc_frequency = LEON2_TIMER_1_FREQUENCY;
tc->tc_quality = RTEMS_TIMECOUNTER_QUALITY_CLOCK_DRIVER;
rtems_timecounter_install(tc);
}
static void leon2_clock_at_tick( void )
{
SPARC_Counter *counter;
rtems_interrupt_level level;
counter = &_SPARC_Counter_mutable;
rtems_interrupt_local_disable(level);
LEON_Clear_interrupt( LEON_INTERRUPT_TIMER1 );
counter->accumulated += counter->interval;
rtems_interrupt_local_enable(level);
}
static void leon2_clock_initialize_early( void )
{
SPARC_Counter *counter;
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
);
counter = &_SPARC_Counter_mutable;
counter->read_isr_disabled = _SPARC_Counter_read_clock_isr_disabled;
counter->read = _SPARC_Counter_read_clock;
counter->counter_register = &LEON_REG.Timer_Counter_1;
counter->pending_register = &LEON_REG.Interrupt_Pending;
counter->pending_mask = UINT32_C(1) << LEON_INTERRUPT_TIMER1;
counter->accumulated = rtems_configuration_get_microseconds_per_tick();
counter->interval = rtems_configuration_get_microseconds_per_tick();
}
RTEMS_SYSINIT_ITEM(
leon2_clock_initialize_early,
RTEMS_SYSINIT_CPU_COUNTER,
RTEMS_SYSINIT_ORDER_FIRST
);
uint32_t _CPU_Counter_frequency(void)
{
return LEON2_TIMER_1_FREQUENCY;
}
/*
* 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 )
#define Clock_driver_support_at_tick() leon2_clock_at_tick()
#define Clock_driver_support_initialize_hardware() leon2_clock_init()
#include "../../../shared/dev/clock/clockimpl.h"
SPARC_COUNTER_DEFINITION;
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