/*
 * Copyright (c) 2013-2015, 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  system module for variants with LOAPIC
 *
 */

#include <misc/__assert.h>
#include "board.h"
#include <nanokernel.h>
#include <arch/cpu.h>
#include <drivers/ioapic.h>
#include <drivers/loapic.h>
#include <drivers/sysapic.h>
#include <irq.h>

#define IS_IOAPIC_IRQ(irq)  (irq < LOAPIC_IRQ_BASE)
#define HARDWARE_IRQ_LIMIT ((LOAPIC_IRQ_BASE + LOAPIC_IRQ_COUNT) - 1)

/**
 *
 * @brief Program interrupt controller
 *
 * This routine programs the interrupt controller with the given vector
 * based on the given IRQ parameter.
 *
 * Drivers call this routine instead of IRQ_CONNECT() when interrupts are
 * configured statically.
 *
 * The Galileo board virtualizes IRQs as follows:
 *
 * - The first CONFIG_IOAPIC_NUM_RTES IRQs are provided by the IOAPIC so the
 *     IOAPIC is programmed for these IRQs
 * - The remaining IRQs are provided by the LOAPIC and hence the LOAPIC is
 *     programmed.
 *
 * @param vector the vector number
 * @param irq the virtualized IRQ
 * @param flags interrupt flags
 *
 */
void __irq_controller_irq_config(unsigned int vector, unsigned int irq,
				 uint32_t flags)
{
	__ASSERT(irq >= 0 && irq <= HARDWARE_IRQ_LIMIT, "invalid irq line");

	if (IS_IOAPIC_IRQ(irq)) {
		_ioapic_irq_set(irq, vector, flags);
	} else {
		_loapic_int_vec_set(irq - LOAPIC_IRQ_BASE, vector);
	}
}

/**
 *
 * @brief Enable an individual interrupt (IRQ)
 *
 * The public interface for enabling/disabling a specific IRQ for the IA-32
 * architecture is defined as follows in include/arch/x86/arch.h
 *
 *   extern void  irq_enable  (unsigned int irq);
 *   extern void  irq_disable (unsigned int irq);
 *
 * The irq_enable() routine is provided by the interrupt controller driver due
 * to the IRQ virtualization that is performed by this platform.  See the
 * comments in _interrupt_vector_allocate() for more information regarding IRQ
 * virtualization.
 *
 * @return N/A
 */
void _arch_irq_enable(unsigned int irq)
{
	if (IS_IOAPIC_IRQ(irq)) {
		_ioapic_irq_enable(irq);
	} else {
		_loapic_irq_enable(irq - LOAPIC_IRQ_BASE);
	}
}

/**
 *
 * @brief Disable an individual interrupt (IRQ)
 *
 * The irq_disable() routine is provided by the interrupt controller driver due
 * to the IRQ virtualization that is performed by this platform.  See the
 * comments in _interrupt_vector_allocate() for more information regarding IRQ
 * virtualization.
 *
 * @return N/A
 */
void _arch_irq_disable(unsigned int irq)
{
	if (IS_IOAPIC_IRQ(irq)) {
		_ioapic_irq_disable(irq);
	} else {
		_loapic_irq_disable(irq - LOAPIC_IRQ_BASE);
	}
}