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