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       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         [ #  # ]:          0 :         if (chip->irq_eoi)
      32                 :            :                 return;
      33                 :            : 
      34         [ #  # ]:          0 :         if (chip->irq_mask_ack) {
      35                 :          0 :                 chip->irq_mask_ack(&desc->irq_data);
      36                 :            :         } else {
      37                 :          0 :                 chip->irq_mask(&desc->irq_data);
      38         [ #  # ]:          0 :                 if (chip->irq_ack)
      39                 :          0 :                         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         [ #  # ]:          0 :         if (chip->irq_eoi)
      47                 :          0 :                 chip->irq_eoi(&desc->irq_data);
      48                 :            :         else
      49                 :          0 :                 chip->irq_unmask(&desc->irq_data);
      50                 :            : }
      51                 :            : 
      52                 :            : #endif /* __IRQCHIP_CHAINED_IRQ_H */