/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSBSPsARMTMS570
*
* @brief This source file contains the Clock Driver implementation.
*/
/*
* Copyright (C) 2014 Premysl Houdek <kom541000@gmail.com>
*
* Google Summer of Code 2014 at
* Czech Technical University in Prague
* Zikova 1903/4
* 166 36 Praha 6
* Czech Republic
*
* 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 <stdlib.h>
#include <rtems.h>
#include <bsp.h>
#include <bsp/irq.h>
#include <bsp/tms570.h>
#include <rtems/timecounter.h>
static struct timecounter tms570_rti_tc;
static uint32_t tms570_rti_get_timecount(struct timecounter *tc)
{
return TMS570_RTI.CNT[0].FRCx;
}
#ifndef TMS570_PREFERRED_TC_FREQUENCY
/*
* Define preferred main time base counter frequency
* The value of 1MHz is the best matching RTEMS
* timing system because then there is no need
* to scale RTEMS configuration microseconds_per_tick
* parameter
*/
#define TMS570_PREFERRED_TC_FREQUENCY 1000000
#endif /* TMS570_PREFERRED_TC_FREQUENCY */
/**
* @brief Initialize the HW peripheral for clock driver
*
* Clock driver is implemented by RTI module
*
* @retval Void
*/
static void tms570_clock_driver_support_initialize_hardware( void )
{
uint32_t microsec_per_tick;
uint32_t tc_frequency;
uint32_t tc_prescaler;
uint32_t tc_increments_per_tick;
microsec_per_tick = rtems_configuration_get_microseconds_per_tick();
tc_frequency = TMS570_PREFERRED_TC_FREQUENCY;
tc_prescaler = (BSP_PLL_OUT_CLOCK + tc_frequency) / (tc_frequency * 2);
/* Recompute actual most close frequency which can be realized */
tc_frequency = (BSP_PLL_OUT_CLOCK + tc_prescaler) / (tc_prescaler * 2);
/*
* Recompute tick period to adjust for configurable or exact
* preferred time base 1 usec resolution.
*/
tc_increments_per_tick = ((uint64_t)microsec_per_tick * tc_frequency +
500000) / 1000000;
/* Hardware specific initialize */
TMS570_RTI.GCTRL = 0;
TMS570_RTI.CNT[0].CPUCx = tc_prescaler - 1;
TMS570_RTI.TBCTRL = TMS570_RTI_TBCTRL_INC;
TMS570_RTI.CAPCTRL = 0;
TMS570_RTI.COMPCTRL = 0;
/* set counter to zero */
TMS570_RTI.CNT[0].UCx = 0;
TMS570_RTI.CNT[0].FRCx = 0;
/* clear interrupts*/
TMS570_RTI.CLEARINTENA = TMS570_RTI_CLEARINTENA_CLEAROVL1INT |
TMS570_RTI_CLEARINTENA_CLEAROVL0INT |
TMS570_RTI_CLEARINTENA_CLEARTBINT |
TMS570_RTI_CLEARINTENA_CLEARDMA3 |
TMS570_RTI_CLEARINTENA_CLEARDMA2 |
TMS570_RTI_CLEARINTENA_CLEARDMA1 |
TMS570_RTI_CLEARINTENA_CLEARDMA0 |
TMS570_RTI_CLEARINTENA_CLEARINT3 |
TMS570_RTI_CLEARINTENA_CLEARINT2 |
TMS570_RTI_CLEARINTENA_CLEARINT1 |
TMS570_RTI_CLEARINTENA_CLEARINT0;
TMS570_RTI.INTFLAG = TMS570_RTI_INTFLAG_OVL1INT |
TMS570_RTI_INTFLAG_OVL0INT |
TMS570_RTI_INTFLAG_TBINT |
TMS570_RTI_INTFLAG_INT3 |
TMS570_RTI_INTFLAG_INT2 |
TMS570_RTI_INTFLAG_INT1 |
TMS570_RTI_INTFLAG_INT0;
/* set timer */
TMS570_RTI.CMP[0].COMPx = TMS570_RTI.CNT[0].FRCx + tc_increments_per_tick;
TMS570_RTI.COMP0CLR = TMS570_RTI.CMP[0].COMPx + tc_increments_per_tick / 2;
TMS570_RTI.CMP[0].UDCPx = tc_increments_per_tick;
/* enable interupt */
TMS570_RTI.SETINTENA = TMS570_RTI_SETINTENA_SETINT0;
/* enable timer */
TMS570_RTI.GCTRL = TMS570_RTI_GCTRL_CNT0EN;
/* set timecounter */
tms570_rti_tc.tc_get_timecount = tms570_rti_get_timecount;
tms570_rti_tc.tc_counter_mask = 0xffffffff;
tms570_rti_tc.tc_frequency = tc_frequency;
tms570_rti_tc.tc_quality = RTEMS_TIMECOUNTER_QUALITY_CLOCK_DRIVER;
rtems_timecounter_install(&tms570_rti_tc);
}
/**
* @brief Clears interrupt source
*
* @retval Void
*/
static void tms570_clock_driver_support_at_tick(volatile tms570_rti_t *rti)
{
rti->INTFLAG = TMS570_RTI_INTFLAG_INT0;
}
/**
* @brief registers RTI interrupt handler
*
* @param[in] Clock_isr new ISR handler
* @param[in] Old_ticker old ISR handler (unused and type broken)
*
* @retval Void
*/
static void tms570_clock_driver_support_install_isr(
rtems_interrupt_handler handler
)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
sc = rtems_interrupt_handler_install(
TMS570_IRQ_TIMER_0,
"Clock",
RTEMS_INTERRUPT_UNIQUE,
handler,
RTEMS_DEVOLATILE(tms570_rti_t *, &TMS570_RTI)
);
if ( sc != RTEMS_SUCCESSFUL ) {
rtems_fatal_error_occurred(0xdeadbeef);
}
}
#define Clock_driver_support_initialize_hardware \
tms570_clock_driver_support_initialize_hardware
#define Clock_driver_support_at_tick(arg) \
tms570_clock_driver_support_at_tick(arg)
#define Clock_driver_support_initialize_hardware \
tms570_clock_driver_support_initialize_hardware
#define Clock_driver_support_install_isr(handler) \
tms570_clock_driver_support_install_isr(handler)
#include "../../../shared/dev/clock/clockimpl.h"
