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/**
* @file clock.c
*
* @ingroup tms570
*
* @brief clock functions definitions.
*/
/*
* 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
*
* Based on LPC24xx and LPC1768 BSP
* by embedded brains GmbH and others
*
* 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 <stdlib.h>
#include <rtems.h>
#include <bsp.h>
#include <bsp/irq.h>
#include <bsp/tms570-rti.h>
/**
* holds HW counter value since last interrupt event
* sets in tms570_clock_driver_support_at_tick
* used in tms570_clock_driver_nanoseconds_since_last_tick
*/
static uint32_t tms570_rti_last_tick_fcr0;
/**
* @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 = rtems_configuration_get_microseconds_per_tick();
/* Hardware specific initialize */
TMS570_RTI.RTIGCTRL = 0;
TMS570_RTI.RTICPUC0 = BSP_PLL_OUT_CLOCK /1000000 / 2; /* prescaler */
TMS570_RTI.RTITBCTRL = 2;
TMS570_RTI.RTICAPCTRL = 0;
TMS570_RTI.RTICOMPCTRL = 0;
/* set counter to zero */
TMS570_RTI.RTIUC0 = 0;
TMS570_RTI.RTIFRC0 = 0;
/* clear interrupts*/
TMS570_RTI.RTICLEARINTENA = 0x00070f0f;
TMS570_RTI.RTIINTFLAG = 0x0007000f;
/* set timer */
TMS570_RTI.RTICOMP0 = TMS570_RTI.RTIFRC0 + microsec_per_tick;
TMS570_RTI.RTICOMP0CLR = TMS570_RTI.RTICOMP0 + microsec_per_tick / 2;
TMS570_RTI.RTIUDCP0 = microsec_per_tick;
/* enable interupt */
TMS570_RTI.RTISETINTENA = 0x1;
/* enable timer */
TMS570_RTI.RTIGCTRL = 1;
}
/**
* @brief Clears interrupt source
*
* @retval Void
*/
static void tms570_clock_driver_support_at_tick( void )
{
TMS570_RTI.RTIINTFLAG = 0x00000001;
tms570_rti_last_tick_fcr0 = TMS570_RTI.RTICOMP0 - TMS570_RTI.RTIUDCP0;
/* TMS570_RTI.RTICOMP0 += 1000; */
}
/**
* @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_isr_entry Clock_isr
)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
sc = rtems_interrupt_handler_install(
TMS570_IRQ_TIMER_0,
"Clock",
RTEMS_INTERRUPT_UNIQUE,
(rtems_interrupt_handler) Clock_isr,
NULL
);
if ( sc != RTEMS_SUCCESSFUL ) {
rtems_fatal_error_occurred(0xdeadbeef);
}
}
/**
* @brief disables RTI interrupt
*
* Called when closing clock driver
*
* @retval Void
*/
static void tms570_clock_driver_support_shutdown_hardware( void )
{
/* turn off the timer interrupts */
TMS570_RTI.RTICLEARINTENA = 0x20000;
}
/**
* @brief returns the nanoseconds since last tick
*
* Return the nanoseconds since last tick
*
* @retval x nanoseconds
*
*/
static uint32_t tms570_clock_driver_nanoseconds_since_last_tick( void )
{
uint32_t actual_fcr0 = TMS570_RTI.RTIFRC0;
uint32_t usec_since_tick;
usec_since_tick = actual_fcr0 - tms570_rti_last_tick_fcr0;
return usec_since_tick * 1000;
}
#define Clock_driver_support_initialize_hardware \
tms570_clock_driver_support_initialize_hardware
#define Clock_driver_support_at_tick \
tms570_clock_driver_support_at_tick
#define Clock_driver_support_initialize_hardware \
tms570_clock_driver_support_initialize_hardware
#define Clock_driver_support_shutdown_hardware \
tms570_clock_driver_support_shutdown_hardware
#define Clock_driver_nanoseconds_since_last_tick \
tms570_clock_driver_nanoseconds_since_last_tick
#define Clock_driver_support_install_isr(Clock_isr, Old_ticker ) \
tms570_clock_driver_support_install_isr( Clock_isr )
void Clock_isr(void *arg); /* to supress warning */
#include "../../../shared/clockdrv_shell.h"
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