forked from Imagelibrary/rtems
106 lines
2.3 KiB
C
106 lines
2.3 KiB
C
/*
|
|
* Use the last periodic interval timer (PIT2) as the system clock.
|
|
*/
|
|
|
|
#include <rtems.h>
|
|
#include <rtems/timecounter.h>
|
|
#include <bsp.h>
|
|
|
|
/*
|
|
* Use INTC1 base
|
|
*/
|
|
#define CLOCK_VECTOR (128+46)
|
|
|
|
static rtems_timecounter_simple mcf5329_tc;
|
|
|
|
static uint32_t mcf5329_tc_get(rtems_timecounter_simple *tc)
|
|
{
|
|
return MCF_PIT3_PCNTR;
|
|
}
|
|
|
|
static bool mcf5329_tc_is_pending(rtems_timecounter_simple *tc)
|
|
{
|
|
return (MCF_PIT3_PCSR & MCF_PIT_PCSR_PIF) != 0;
|
|
}
|
|
|
|
static uint32_t mcf5329_tc_get_timecount(struct timecounter *tc)
|
|
{
|
|
return rtems_timecounter_simple_downcounter_get(
|
|
tc,
|
|
mcf5329_tc_get,
|
|
mcf5329_tc_is_pending
|
|
);
|
|
}
|
|
|
|
static void mcf5329_tc_at_tick(rtems_timecounter_simple *tc)
|
|
{
|
|
MCF_PIT3_PCSR |= MCF_PIT_PCSR_PIF;
|
|
}
|
|
|
|
static void mcf5329_tc_tick(void)
|
|
{
|
|
rtems_timecounter_simple_downcounter_tick(
|
|
&mcf5329_tc,
|
|
mcf5329_tc_get,
|
|
mcf5329_tc_at_tick
|
|
);
|
|
}
|
|
|
|
/*
|
|
* 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 { \
|
|
MCF_PIT3_PCSR &= ~MCF_PIT_PCSR_EN; \
|
|
} while (0)
|
|
|
|
/*
|
|
* Set up the clock hardware
|
|
*
|
|
* We need to have 1 interrupt every rtems_configuration_get_microseconds_per_tick()
|
|
*/
|
|
static void Clock_driver_support_initialize_hardware(void)
|
|
{
|
|
int level;
|
|
uint32_t pmr;
|
|
uint32_t preScaleCode = 0;
|
|
uint32_t clk = bsp_get_BUS_clock_speed();
|
|
uint32_t tps = 1000000 / rtems_configuration_get_microseconds_per_tick();
|
|
|
|
while (preScaleCode < 15) {
|
|
pmr = (clk >> preScaleCode) / tps;
|
|
if (pmr < (1 << 15))
|
|
break;
|
|
preScaleCode++;
|
|
}
|
|
MCF_INTC1_ICR46 = MCF_INTC_ICR_IL(PIT3_IRQ_LEVEL);
|
|
|
|
rtems_interrupt_disable(level);
|
|
MCF_INTC1_IMRH &= ~MCF_INTC_IMRH_INT_MASK46;
|
|
MCF_PIT3_PCSR &= ~MCF_PIT_PCSR_EN;
|
|
rtems_interrupt_enable(level);
|
|
|
|
MCF_PIT3_PCSR = MCF_PIT_PCSR_PRE(preScaleCode) |
|
|
MCF_PIT_PCSR_OVW | MCF_PIT_PCSR_PIE | MCF_PIT_PCSR_RLD;
|
|
MCF_PIT3_PMR = pmr;
|
|
MCF_PIT3_PCSR = MCF_PIT_PCSR_PRE(preScaleCode) |
|
|
MCF_PIT_PCSR_PIE | MCF_PIT_PCSR_RLD | MCF_PIT_PCSR_EN;
|
|
|
|
rtems_timecounter_simple_install(
|
|
&mcf5329_tc,
|
|
clk >> preScaleCode,
|
|
pmr,
|
|
mcf5329_tc_get_timecount
|
|
);
|
|
}
|
|
|
|
#define Clock_driver_timecounter_tick() mcf5329_tc_tick()
|
|
|
|
#include "../../../shared/dev/clock/clockimpl.h"
|