include/linux/irqchip/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  */
  16 static 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
  32 static 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 */