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/*
* By Yang Xi <hiyangxi@gmail.com>
* PXA255 clock specific using the System Timer
*
* RTEMS uses IRQ 26 as Clock Source
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#include <rtems.h>
#include <rtems/clockdrv.h>
#include <rtems/libio.h>
#include <stdlib.h>
#include <bsp.h>
#include <bspopts.h>
#include <bsp/irq.h>
#include <pxa255.h>
#if ON_SKYEYE==1
#define CLOCK_DRIVER_USE_FAST_IDLE
#endif
static unsigned long period_num;
/**
* Return the nanoseconds since last tick
*/
uint32_t clock_driver_get_nanoseconds_since_last_tick(void)
{
return 0;
}
#define Clock_driver_nanoseconds_since_last_tick \
clock_driver_get_nanoseconds_since_last_tick
/**
* Enables clock interrupt.
*
* If the interrupt is always on, this can be a NOP.
*/
static void clock_isr_on(const rtems_irq_connect_data *unused)
{
/*Clear the interrupt bit */
XSCALE_OS_TIMER_TSR = 0x1;
/* enable timer interrupt */
XSCALE_OS_TIMER_IER |= 0x1;
#if ON_SKYEYE==1
period_num = (TIMER_RATE* Configuration.microseconds_per_tick)/100000;
#else
period_num = (TIMER_RATE* Configuration.microseconds_per_tick)/10000;
#endif
XSCALE_OS_TIMER_MR0 = XSCALE_OS_TIMER_TCR + period_num;
}
/**
* Disables clock interrupts
*
* If the interrupt is always on, this can be a NOP.
*/
static void clock_isr_off(const rtems_irq_connect_data *unused)
{
/*Clear the interrupt bit */
XSCALE_OS_TIMER_TSR = 0x1;
/* disable timer interrupt*/
XSCALE_OS_TIMER_IER &= ~0x1;
return;
}
/**
* Tests to see if clock interrupt is enabled, and returns 1 if so.
* If interrupt is not enabled, returns 0.
*
* If the interrupt is always on, this always returns 1.
*/
static int clock_isr_is_on(const rtems_irq_connect_data *irq)
{
/* check timer interrupt */
return XSCALE_OS_TIMER_IER & 0x1;
}
rtems_isr Clock_isr(rtems_vector_number vector);
/* Replace the first value with the clock's interrupt name. */
rtems_irq_connect_data clock_isr_data = {
XSCALE_IRQ_OS_TIMER,
(rtems_irq_hdl)Clock_isr,
NULL,
clock_isr_on,
clock_isr_off,
clock_isr_is_on
};
#define Clock_driver_support_install_isr( _new, _old ) \
do { \
_old = NULL; \
BSP_install_rtems_irq_handler(&clock_isr_data); \
} while (0)
void Clock_driver_support_initialize_hardware(void)
{
#if ON_SKYEYE==1
period_num = (TIMER_RATE* Configuration.microseconds_per_tick)/100000;
#else
period_num = (TIMER_RATE* Configuration.microseconds_per_tick)/10000;
#endif
}
#define CLOCK_VECTOR 0
#define Clock_driver_support_at_tick() \
do { \
/* read the status to clear the int */ \
XSCALE_OS_TIMER_TSR = 0x1; \
\
/*Add the match register*/ \
XSCALE_OS_TIMER_MR0 = XSCALE_OS_TIMER_TCR + period_num; \
} while (0)
void Clock_driver_support_shutdown_hardware( void )
{
BSP_remove_rtems_irq_handler(&clock_isr_data);
}
#include "../../../../libbsp/shared/clockdrv_shell.h"
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