include/linux/irqchip/chained_irq.h

   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 */