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de88cbb7 CM |
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 | */ | |
27 | static 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 | ||
43 | static 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 */ |