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/*
* PXA255 clock specific using the System Timer
*
* RTEMS uses IRQ 26 as Clock Source
*/
/*
* By Yang Xi <hiyangxi@gmail.com>
*
* 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 <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 1
#endif
static unsigned long period_num;
/**
* 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* rtems_configuration_get_microseconds_per_tick())/100000;
#else
period_num = (TIMER_RATE* rtems_configuration_get_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;
}
/**
* 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;
}
void Clock_isr(rtems_irq_hdl_param arg);
rtems_irq_connect_data clock_isr_data = {
.name = XSCALE_IRQ_OS_TIMER,
.hdl = Clock_isr,
.handle = NULL,
.on = clock_isr_on,
.off = clock_isr_off,
.isOn = clock_isr_is_on,
};
#define Clock_driver_support_install_isr( _new ) \
BSP_install_rtems_irq_handler(&clock_isr_data)
static void Clock_driver_support_initialize_hardware(void)
{
period_num = TIMER_RATE* rtems_configuration_get_microseconds_per_tick();
#if ON_SKYEYE==1
period_num /= 100000;
#else
period_num /= 10000;
#endif
}
#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)
#define CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER
#include "../../../shared/dev/clock/clockimpl.h"
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