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/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @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.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <bsp.h>
#include <bspopts.h>
#include <rtems/sysinit.h>
#include <rtems/timecounter.h>
#include <bsp/sparc-counter.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;
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;
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;
}
#define Clock_driver_support_install_isr( _new ) \
(void) rtems_interrupt_handler_install( \
LEON_INTERRUPT_TIMER1, \
"Clock", \
RTEMS_INTERRUPT_SHARED, \
_new, \
NULL \
)
#define Clock_driver_support_at_tick(arg) 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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