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/*
* Copyright (c) 2014 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* 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 <leon.h>
#include <rtems/counter.h>
static CPU_Counter_ticks timestamp_counter_difference(
CPU_Counter_ticks second,
CPU_Counter_ticks first
)
{
return second - first;
}
static CPU_Counter_ticks clock_counter_difference(
CPU_Counter_ticks second,
CPU_Counter_ticks first
)
{
CPU_Counter_ticks period = rtems_configuration_get_microseconds_per_tick();
return (first + period - second) % period;
}
static void gpt_counter_initialize(
volatile struct gptimer_regs *gpt,
size_t timer_index,
uint32_t frequency,
SPARC_Counter_difference counter_difference
)
{
_SPARC_Counter_initialize(
(volatile const uint32_t *) &gpt->timer[timer_index].value,
counter_difference
);
rtems_counter_initialize_converter(frequency);
}
void leon3_cpu_counter_initialize(void)
{
volatile struct irqmp_timestamp_regs *irqmp_ts =
&LEON3_IrqCtrl_Regs->timestamp[0];
unsigned int freq;
if (leon3_irqmp_has_timestamp(irqmp_ts)) {
/* Use the interrupt controller timestamp counter if available */
/* Enable interrupt timestamping for an arbitrary interrupt line */
irqmp_ts->control = 0x1;
_SPARC_Counter_initialize(
(volatile const uint32_t *) &irqmp_ts->counter,
timestamp_counter_difference
);
/* Get and set the frequency */
rtems_counter_initialize_converter(
ambapp_freq_get(&ambapp_plb, LEON3_IrqCtrl_Adev));
} else if (LEON3_Timer_Regs != NULL) {
/* Fall back to the first GPTIMER if available */
freq = ambapp_freq_get(&ambapp_plb, LEON3_Timer_Adev);
gpt_counter_initialize(
LEON3_Timer_Regs,
LEON3_CLOCK_INDEX,
freq / (LEON3_Timer_Regs->scaler_reload - 1),
clock_counter_difference
);
}
}
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