forked from Imagelibrary/rtems
85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
/*
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* Copyright (c) 2014, 2016 embedded brains GmbH. All rights reserved.
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*
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* embedded brains GmbH
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* Dornierstr. 4
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* 82178 Puchheim
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* Germany
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* <rtems@embedded-brains.de>
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#include <leon.h>
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#include <rtems/counter.h>
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#include <rtems/sysinit.h>
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#include <rtems/score/sparcimpl.h>
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static uint32_t leon3_counter_frequency = 1000000000;
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uint32_t _CPU_Counter_frequency(void)
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{
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return leon3_counter_frequency;
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}
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static void leon3_counter_initialize(void)
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{
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volatile struct irqmp_timestamp_regs *irqmp_ts;
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volatile struct gptimer_regs *gpt;
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irqmp_ts = &LEON3_IrqCtrl_Regs->timestamp[0];
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gpt = LEON3_Timer_Regs;
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leon3_up_counter_enable();
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if (leon3_up_counter_is_available()) {
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/* Use the LEON4 up-counter if available */
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_SPARC_Counter_initialize(
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_SPARC_Counter_read_asr23,
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_SPARC_Counter_difference_normal,
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NULL
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);
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leon3_counter_frequency = leon3_up_counter_frequency();
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} else if (leon3_irqmp_has_timestamp(irqmp_ts)) {
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/* Use the interrupt controller timestamp counter if available */
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/* Enable interrupt timestamping for an arbitrary interrupt line */
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irqmp_ts->control = 0x1;
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_SPARC_Counter_initialize(
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_SPARC_Counter_read_address,
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_SPARC_Counter_difference_normal,
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(volatile const uint32_t *) &irqmp_ts->counter
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);
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leon3_counter_frequency = ambapp_freq_get(&ambapp_plb, LEON3_IrqCtrl_Adev);
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} else if (gpt != NULL) {
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/* Fall back to the first GPTIMER if available */
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/* Enable timer just in case no clock driver is configured */
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gpt->timer[LEON3_CLOCK_INDEX].ctrl |= GPTIMER_TIMER_CTRL_EN;
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_SPARC_Counter_initialize(
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_SPARC_Counter_read_address,
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_SPARC_Counter_difference_clock_period,
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(volatile const uint32_t *) &gpt->timer[LEON3_CLOCK_INDEX].value
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);
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leon3_counter_frequency = ambapp_freq_get(&ambapp_plb, LEON3_Timer_Adev) /
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(gpt->scaler_reload + 1);
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}
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}
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RTEMS_SYSINIT_ITEM(
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leon3_counter_initialize,
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RTEMS_SYSINIT_CPU_COUNTER,
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RTEMS_SYSINIT_ORDER_FIRST
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);
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SPARC_COUNTER_DEFINITION;
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