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- /*
- * arch/arm/mach-ns9xxx/irq.c
- *
- * Copyright (C) 2006,2007 by Digi International Inc.
- * All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published by
- * the Free Software Foundation.
- */
- #include <linux/interrupt.h>
- #include <asm/mach/irq.h>
- #include <asm/mach-types.h>
- #include <asm/arch-ns9xxx/regs-sys.h>
- #include <asm/arch-ns9xxx/irqs.h>
- #include <asm/arch-ns9xxx/board.h>
- #include "generic.h"
- static void ns9xxx_ack_irq_timer(unsigned int irq)
- {
- u32 tc = SYS_TC(irq - IRQ_TIMER0);
- REGSET(tc, SYS_TCx, INTC, SET);
- SYS_TC(irq - IRQ_TIMER0) = tc;
- REGSET(tc, SYS_TCx, INTC, UNSET);
- SYS_TC(irq - IRQ_TIMER0) = tc;
- }
- void (*ns9xxx_ack_irq_functions[NR_IRQS])(unsigned int) = {
- [IRQ_TIMER0] = ns9xxx_ack_irq_timer,
- [IRQ_TIMER1] = ns9xxx_ack_irq_timer,
- [IRQ_TIMER2] = ns9xxx_ack_irq_timer,
- [IRQ_TIMER3] = ns9xxx_ack_irq_timer,
- };
- static void ns9xxx_mask_irq(unsigned int irq)
- {
- /* XXX: better use cpp symbols */
- SYS_IC(irq / 4) &= ~(1 << (7 + 8 * (3 - (irq & 3))));
- }
- static void ns9xxx_ack_irq(unsigned int irq)
- {
- if (!ns9xxx_ack_irq_functions[irq]) {
- printk(KERN_ERR "no ack function for irq %u\n", irq);
- BUG();
- }
- ns9xxx_ack_irq_functions[irq](irq);
- SYS_ISRADDR = 0;
- }
- static void ns9xxx_maskack_irq(unsigned int irq)
- {
- ns9xxx_mask_irq(irq);
- ns9xxx_ack_irq(irq);
- }
- static void ns9xxx_unmask_irq(unsigned int irq)
- {
- /* XXX: better use cpp symbols */
- SYS_IC(irq / 4) |= 1 << (7 + 8 * (3 - (irq & 3)));
- }
- static struct irq_chip ns9xxx_chip = {
- .ack = ns9xxx_ack_irq,
- .mask = ns9xxx_mask_irq,
- .mask_ack = ns9xxx_maskack_irq,
- .unmask = ns9xxx_unmask_irq,
- };
- void __init ns9xxx_init_irq(void)
- {
- int i;
- /* disable all IRQs */
- for (i = 0; i < 8; ++i)
- SYS_IC(i) = (4 * i) << 24 | (4 * i + 1) << 16 |
- (4 * i + 2) << 8 | (4 * i + 3);
- /* simple interrupt prio table:
- * prio(x) < prio(y) <=> x < y
- */
- for (i = 0; i < 32; ++i)
- SYS_IVA(i) = i;
- for (i = IRQ_WATCHDOG; i <= IRQ_EXT3; ++i) {
- set_irq_chip(i, &ns9xxx_chip);
- set_irq_handler(i, handle_level_irq);
- set_irq_flags(i, IRQF_VALID);
- }
- }
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