1/*
2 * Chained IRQ handlers support.
3 *
4 * Copyright (C) 2011 ARM Ltd.
5 *
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
17 */
18#ifndef __IRQCHIP_CHAINED_IRQ_H
19#define __IRQCHIP_CHAINED_IRQ_H
20
21#include <linux/irq.h>
22
23/*
24 * Entry/exit functions for chained handlers where the primary IRQ chip
25 * may implement either fasteoi or level-trigger flow control.
26 */
27static inline void chained_irq_enter(struct irq_chip *chip,
28				     struct irq_desc *desc)
29{
30	/* FastEOI controllers require no action on entry. */
31	if (chip->irq_eoi)
32		return;
33
34	if (chip->irq_mask_ack) {
35		chip->irq_mask_ack(&desc->irq_data);
36	} else {
37		chip->irq_mask(&desc->irq_data);
38		if (chip->irq_ack)
39			chip->irq_ack(&desc->irq_data);
40	}
41}
42
43static inline void chained_irq_exit(struct irq_chip *chip,
44				    struct irq_desc *desc)
45{
46	if (chip->irq_eoi)
47		chip->irq_eoi(&desc->irq_data);
48	else
49		chip->irq_unmask(&desc->irq_data);
50}
51
52#endif /* __IRQCHIP_CHAINED_IRQ_H */
53