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Directory :  /usr/src/linux-headers-3.13.0-170/include/linux/irqchip/

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Current File : /usr/src/linux-headers-3.13.0-170/include/linux/irqchip/chained_irq.h
/*
 * Chained IRQ handlers support.
 *
 * Copyright (C) 2011 ARM Ltd.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef __IRQCHIP_CHAINED_IRQ_H
#define __IRQCHIP_CHAINED_IRQ_H

#include <linux/irq.h>

/*
 * Entry/exit functions for chained handlers where the primary IRQ chip
 * may implement either fasteoi or level-trigger flow control.
 */
static inline void chained_irq_enter(struct irq_chip *chip,
				     struct irq_desc *desc)
{
	/* FastEOI controllers require no action on entry. */
	if (chip->irq_eoi)
		return;

	if (chip->irq_mask_ack) {
		chip->irq_mask_ack(&desc->irq_data);
	} else {
		chip->irq_mask(&desc->irq_data);
		if (chip->irq_ack)
			chip->irq_ack(&desc->irq_data);
	}
}

static inline void chained_irq_exit(struct irq_chip *chip,
				    struct irq_desc *desc)
{
	if (chip->irq_eoi)
		chip->irq_eoi(&desc->irq_data);
	else
		chip->irq_unmask(&desc->irq_data);
}

#endif /* __IRQCHIP_CHAINED_IRQ_H */

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