1de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas/* 2de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas * Chained IRQ handlers support. 3de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas * 4de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas * Copyright (C) 2011 ARM Ltd. 5de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas * 6de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas * This program is free software: you can redistribute it and/or modify 7de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas * it under the terms of the GNU General Public License version 2 as 8de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas * published by the Free Software Foundation. 9de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas * 10de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas * This program is distributed in the hope that it will be useful, 11de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas * but WITHOUT ANY WARRANTY; without even the implied warranty of 12de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas * GNU General Public License for more details. 14de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas * 15de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas * You should have received a copy of the GNU General Public License 16de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas * along with this program. If not, see <http://www.gnu.org/licenses/>. 17de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas */ 18de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas#ifndef __IRQCHIP_CHAINED_IRQ_H 19de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas#define __IRQCHIP_CHAINED_IRQ_H 20de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas 21de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas#include <linux/irq.h> 22de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas 23de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas/* 24de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas * Entry/exit functions for chained handlers where the primary IRQ chip 25de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas * may implement either fasteoi or level-trigger flow control. 26de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas */ 27de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinasstatic inline void chained_irq_enter(struct irq_chip *chip, 28de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas struct irq_desc *desc) 29de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas{ 30de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas /* FastEOI controllers require no action on entry. */ 31de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas if (chip->irq_eoi) 32de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas return; 33de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas 34de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas if (chip->irq_mask_ack) { 35de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas chip->irq_mask_ack(&desc->irq_data); 36de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas } else { 37de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas chip->irq_mask(&desc->irq_data); 38de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas if (chip->irq_ack) 39de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas chip->irq_ack(&desc->irq_data); 40de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas } 41de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas} 42de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas 43de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinasstatic inline void chained_irq_exit(struct irq_chip *chip, 44de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas struct irq_desc *desc) 45de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas{ 46de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas if (chip->irq_eoi) 47de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas chip->irq_eoi(&desc->irq_data); 48de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas else 49de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas chip->irq_unmask(&desc->irq_data); 50de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas} 51de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas 52de88cbb7b244f3bcd61d49fd6dec35c19192545aCatalin Marinas#endif /* __IRQCHIP_CHAINED_IRQ_H */ 53