chained_irq.h

 1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 * Chained IRQ handlers support.
 4 *
 5 * Copyright (C) 2011 ARM Ltd.
 6 */
 7#ifndef __IRQCHIP_CHAINED_IRQ_H
 8#define __IRQCHIP_CHAINED_IRQ_H
 9
10#include <linux/irq.h>
11
12/*
13 * Entry/exit functions for chained handlers where the primary IRQ chip
14 * may implement either fasteoi or level-trigger flow control.
15 */
16static inline void chained_irq_enter(struct irq_chip *chip,
17				     struct irq_desc *desc)
18{
19	/* FastEOI controllers require no action on entry. */
20	if (chip->irq_eoi)
21		return;
22
23	if (chip->irq_mask_ack) {
24		chip->irq_mask_ack(&desc->irq_data);
25	} else {
26		chip->irq_mask(&desc->irq_data);
27		if (chip->irq_ack)
28			chip->irq_ack(&desc->irq_data);
29	}
30}
31
32static inline void chained_irq_exit(struct irq_chip *chip,
33				    struct irq_desc *desc)
34{
35	if (chip->irq_eoi)
36		chip->irq_eoi(&desc->irq_data);
37	else
38		chip->irq_unmask(&desc->irq_data);
39}
40
41#endif /* __IRQCHIP_CHAINED_IRQ_H */