1/* 2 * linux/arch/arm/mach-mmp/irq.c 3 * 4 * Generic IRQ handling, GPIO IRQ demultiplexing, etc. 5 * 6 * Author: Bin Yang <bin.yang@marvell.com> 7 * Created: Sep 30, 2008 8 * Copyright: Marvell International Ltd. 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 as 12 * published by the Free Software Foundation. 13 */ 14 15#include <linux/init.h> 16#include <linux/irq.h> 17#include <linux/io.h> 18 19#include <mach/regs-icu.h> 20 21#include "common.h" 22 23#define IRQ_ROUTE_TO_AP (ICU_INT_CONF_AP_INT | ICU_INT_CONF_IRQ) 24 25#define PRIORITY_DEFAULT 0x1 26#define PRIORITY_NONE 0x0 /* means IRQ disabled */ 27 28static void icu_mask_irq(unsigned int irq) 29{ 30 __raw_writel(PRIORITY_NONE, ICU_INT_CONF(irq)); 31} 32 33static void icu_unmask_irq(unsigned int irq) 34{ 35 __raw_writel(IRQ_ROUTE_TO_AP | PRIORITY_DEFAULT, ICU_INT_CONF(irq)); 36} 37 38static struct irq_chip icu_irq_chip = { 39 .name = "icu_irq", 40 .ack = icu_mask_irq, 41 .mask = icu_mask_irq, 42 .unmask = icu_unmask_irq, 43}; 44 45void __init icu_init_irq(void) 46{ 47 int irq; 48 49 for (irq = 0; irq < 64; irq++) { 50 icu_mask_irq(irq); 51 set_irq_chip(irq, &icu_irq_chip); 52 set_irq_handler(irq, handle_level_irq); 53 set_irq_flags(irq, IRQF_VALID); 54 } 55} 56