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/*
 * Copyright (c) 2014 Wind River Systems, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @file
 * @brief ARCv2 Interrupt Unit device driver
 *
 * The ARCv2 interrupt unit has 16 allocated exceptions associated with
 * vectors 0 to 15 and 240 interrupts associated with vectors 16 to 255.
 * The interrupt unit is optional in the ARCv2-based processors. When
 * building a processor, you can configure the processor to include an
 * interrupt unit. The ARCv2 interrupt unit is highly programmable.
 */

#include <nanokernel.h>
#include <arch/cpu.h>
#include <board.h>
extern void *_VectorTable;

void _arc_v2_irq_unit_init(void)
{
	int irq; /* the interrupt index */

	for (irq = 16; irq < CONFIG_NUM_IRQS; irq++) {
		_arc_v2_aux_reg_write(_ARC_V2_IRQ_SELECT, irq);
		_arc_v2_aux_reg_write(_ARC_V2_IRQ_PRIORITY,
			 (CONFIG_NUM_IRQ_PRIO_LEVELS-1)); /* lowest priority */
		_arc_v2_aux_reg_write(_ARC_V2_IRQ_ENABLE, _ARC_V2_INT_DISABLE);
		_arc_v2_aux_reg_write(_ARC_V2_IRQ_TRIGGER, _ARC_V2_INT_LEVEL);
	}
}

void _arc_v2_irq_unit_int_eoi(int irq)
{
	_arc_v2_aux_reg_write(_ARC_V2_IRQ_SELECT, irq);
	_arc_v2_aux_reg_write(_ARC_V2_IRQ_PULSE_CANCEL, 1);
}

void _arc_v2_irq_unit_trigger_set(int irq, unsigned int trigger)
{
	_arc_v2_aux_reg_write(_ARC_V2_IRQ_SELECT, irq);
	_arc_v2_aux_reg_write(_ARC_V2_IRQ_TRIGGER, trigger);
}

unsigned int _arc_v2_irq_unit_trigger_get(int irq)
{
	_arc_v2_aux_reg_write(_ARC_V2_IRQ_SELECT, irq);
	return _arc_v2_aux_reg_read(_ARC_V2_IRQ_TRIGGER);
}