forked from Imagelibrary/rtems
112 lines
2.8 KiB
C
112 lines
2.8 KiB
C
/**
|
|
* @file
|
|
* @ingroup RTEMSBSPsSPARCLEON2
|
|
* @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;
|