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/*
* Use the last periodic interval timer (PIT3) as the system clock.
*/
#include <rtems.h>
#include <bsp.h>
#include <mcf5235/mcf5235.h>
/*
* Use INTC0 base
*/
#define CLOCK_VECTOR (64+39)
/*
* Periodic interval timer interrupt handler
*/
#define Clock_driver_support_at_tick() \
do { \
MCF5235_PIT_PCSR3 |= MCF5235_PIT_PCSR_PIF; \
} while (0) \
/*
* Attach clock interrupt handler
*/
#define Clock_driver_support_install_isr( _new ) \
set_vector(_new, CLOCK_VECTOR, 1)
/*
* Turn off the clock
*/
#define Clock_driver_support_shutdown_hardware() \
do { \
MCF5235_PIT_PCSR3 &= ~MCF5235_PIT_PCSR_EN; \
} while(0)
/*
* Set up the clock hardware
*
* We need to have 1 interrupt every 10,000 microseconds
* so we need to set prescaler to 64 and the PMR register to 0x2DC6
*/
#define Clock_driver_support_initialize_hardware() \
do { \
int level; \
int preScaleCode = 6; \
MCF5235_INTC0_ICR39 = MCF5235_INTC_ICR_IL(PIT3_IRQ_LEVEL) | \
MCF5235_INTC_ICR_IP(PIT3_IRQ_PRIORITY); \
rtems_interrupt_disable( level ); \
MCF5235_INTC0_IMRH &= ~MCF5235_INTC0_IMRH_INT39; \
MCF5235_PIT_PCSR3 &= ~MCF5235_PIT_PCSR_EN; \
rtems_interrupt_enable( level ); \
MCF5235_PIT_PMR3 = 0x2DC6; \
MCF5235_PIT_PCSR3 = MCF5235_PIT_PCSR_PRE(preScaleCode) | \
MCF5235_PIT_PCSR_PIE | \
MCF5235_PIT_PCSR_RLD | \
MCF5235_PIT_PCSR_EN; \
} while (0)
#define CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER
#include "../../../shared/clockdrv_shell.h"
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