1/* 2 * arch/arm/mach-ns9xxx/irq.c 3 * 4 * Copyright (C) 2006,2007 by Digi International Inc. 5 * All rights reserved. 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License version 2 as published by 9 * the Free Software Foundation. 10 */ 11#include <linux/interrupt.h> 12#include <asm/mach/irq.h> 13#include <asm/mach-types.h> 14#include <asm/arch-ns9xxx/regs-sys.h> 15#include <asm/arch-ns9xxx/irqs.h> 16#include <asm/arch-ns9xxx/board.h> 17 18#include "generic.h" 19 20static void ns9xxx_ack_irq_timer(unsigned int irq) 21{ 22 u32 tc = SYS_TC(irq - IRQ_TIMER0); 23 24 REGSET(tc, SYS_TCx, INTC, SET); 25 SYS_TC(irq - IRQ_TIMER0) = tc; 26 27 REGSET(tc, SYS_TCx, INTC, UNSET); 28 SYS_TC(irq - IRQ_TIMER0) = tc; 29} 30 31void (*ns9xxx_ack_irq_functions[NR_IRQS])(unsigned int) = { 32 [IRQ_TIMER0] = ns9xxx_ack_irq_timer, 33 [IRQ_TIMER1] = ns9xxx_ack_irq_timer, 34 [IRQ_TIMER2] = ns9xxx_ack_irq_timer, 35 [IRQ_TIMER3] = ns9xxx_ack_irq_timer, 36}; 37 38static void ns9xxx_mask_irq(unsigned int irq) 39{ 40 SYS_IC(irq / 4) &= ~(1 << (7 + 8 * (3 - (irq & 3)))); 41} 42 43static void ns9xxx_ack_irq(unsigned int irq) 44{ 45 if (!ns9xxx_ack_irq_functions[irq]) { 46 printk(KERN_ERR "no ack function for irq %u\n", irq); 47 BUG(); 48 } 49 50 ns9xxx_ack_irq_functions[irq](irq); 51 SYS_ISRADDR = 0; 52} 53 54static void ns9xxx_maskack_irq(unsigned int irq) 55{ 56 ns9xxx_mask_irq(irq); 57 ns9xxx_ack_irq(irq); 58} 59 60static void ns9xxx_unmask_irq(unsigned int irq) 61{ 62 SYS_IC(irq / 4) |= 1 << (7 + 8 * (3 - (irq & 3))); 63} 64 65static struct irq_chip ns9xxx_chip = { 66 .ack = ns9xxx_ack_irq, 67 .mask = ns9xxx_mask_irq, 68 .mask_ack = ns9xxx_maskack_irq, 69 .unmask = ns9xxx_unmask_irq, 70}; 71 72void __init ns9xxx_init_irq(void) 73{ 74 int i; 75 76 /* disable all IRQs */ 77 for (i = 0; i < 8; ++i) 78 SYS_IC(i) = (4 * i) << 24 | (4 * i + 1) << 16 | 79 (4 * i + 2) << 8 | (4 * i + 3); 80 81 /* simple interrupt prio table: 82 * prio(x) < prio(y) <=> x < y 83 */ 84 for (i = 0; i < 32; ++i) 85 SYS_IVA(i) = i; 86 87 for (i = IRQ_WATCHDOG; i <= IRQ_EXT3; ++i) { 88 set_irq_chip(i, &ns9xxx_chip); 89 set_irq_handler(i, handle_level_irq); 90 set_irq_flags(i, IRQF_VALID); 91 } 92} 93