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/*
* Copyright (c) 2014, 2018 embedded brains GmbH. All rights reserved.
*
* 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 <bsp/leon3.h>
#include <grlib/irqamp.h>
#include <rtems/counter.h>
#include <rtems/sysinit.h>
#include <rtems/score/sparcimpl.h>
static uint32_t leon3_counter_frequency = 1000000000;
uint32_t _CPU_Counter_frequency(void)
{
return leon3_counter_frequency;
}
static void leon3_counter_initialize(void)
{
irqamp_timestamp *irqmp_ts;
gptimer *gpt;
SPARC_Counter *counter;
irqmp_ts = irqamp_get_timestamp_registers(LEON3_IrqCtrl_Regs);
gpt = LEON3_Timer_Regs;
counter = &_SPARC_Counter_mutable;
leon3_up_counter_enable();
if (leon3_up_counter_is_available()) {
/* Use the LEON4 up-counter if available */
counter->read_isr_disabled = _SPARC_Counter_read_asr23;
counter->read = _SPARC_Counter_read_asr23;
leon3_counter_frequency = leon3_up_counter_frequency();
} else if (irqmp_ts != NULL) {
/* Use the interrupt controller timestamp counter if available */
counter->read_isr_disabled = _SPARC_Counter_read_up;
counter->read = _SPARC_Counter_read_up;
counter->counter_register = &irqmp_ts->itcnt;
/* Enable interrupt timestamping for an arbitrary interrupt line */
grlib_store_32(&irqmp_ts->itstmpc, IRQAMP_ITSTMPC_TSISEL(1));
leon3_counter_frequency = ambapp_freq_get(ambapp_plb(), LEON3_IrqCtrl_Adev);
} else if (gpt != NULL) {
gptimer_timer *timer;
uint32_t tctrl;
/* Fall back to the first GPTIMER if available */
timer = &gpt->timer[LEON3_COUNTER_GPTIMER_INDEX];
counter->read_isr_disabled = _SPARC_Counter_read_down;
counter->read = _SPARC_Counter_read_down;
counter->counter_register = &timer->tcntval;
/* Enable timer just in case no clock driver is configured */
grlib_store_32(&timer->trldval, 0xffffffff);
tctrl = grlib_load_32(&timer->tctrl);
tctrl |= GPTIMER_TCTRL_EN | GPTIMER_TCTRL_RS | GPTIMER_TCTRL_LD;
grlib_store_32(&timer->tctrl, tctrl);
leon3_counter_frequency = ambapp_freq_get(ambapp_plb(), LEON3_Timer_Adev) /
(grlib_load_32(&gpt->sreload) + 1);
}
}
RTEMS_SYSINIT_ITEM(
leon3_counter_initialize,
RTEMS_SYSINIT_CPU_COUNTER,
RTEMS_SYSINIT_ORDER_FIRST
);
SPARC_COUNTER_DEFINITION;
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