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/*
 * Copyright (c) 2016, Linaro Limited
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <kernel/interrupt.h>
#include <trace.h>

/*
 * NOTE!
 *
 * We're assuming that there's no concurrent use of this interface, except
 * delivery of interrupts in parallel. Synchronization will be needed when
 * we begin to modify settings after boot initialization.
 */

static struct itr_chip *itr_chip;
static SLIST_HEAD(, itr_handler) handlers = SLIST_HEAD_INITIALIZER(handlers);

void itr_init(struct itr_chip *chip)
{
	itr_chip = chip;
}

static struct itr_handler *find_handler(size_t it)
{
	struct itr_handler *h;

	SLIST_FOREACH(h, &handlers, link)
		if (h->it == it)
			return h;
	return NULL;
}

void itr_handle(size_t it)
{
	struct itr_handler *h = find_handler(it);

	if (!h) {
		EMSG("Disabling unhandled interrupt %zu", it);
		itr_chip->ops->disable(itr_chip, it);
		return;
	}

	if (h->handler(h) != ITRR_HANDLED) {
		EMSG("Disabling interrupt %zu not handled by handler", it);
		itr_chip->ops->disable(itr_chip, it);
	}
}

void itr_add(struct itr_handler *h)
{
	itr_chip->ops->add(itr_chip, h->it, h->flags);
	SLIST_INSERT_HEAD(&handlers, h, link);
}

void itr_enable(struct itr_handler *h)
{
	itr_chip->ops->enable(itr_chip, h->it);
}

void itr_disable(struct itr_handler *h)
{
	itr_chip->ops->disable(itr_chip, h->it);
}