26c671c6b7
The HRM states that is must be done this way ... Signed-off-by: Uwe Kleine-König <ukleinek@informatik.uni-freiburg.de> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
104 lines
2.4 KiB
C
104 lines
2.4 KiB
C
/*
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* arch/arm/mach-ns9xxx/irq.c
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*
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* Copyright (C) 2006,2007 by Digi International Inc.
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#include <linux/interrupt.h>
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#include <asm/mach/irq.h>
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#include <asm/mach-types.h>
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#include <asm/arch-ns9xxx/regs-sys.h>
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#include <asm/arch-ns9xxx/irqs.h>
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#include <asm/arch-ns9xxx/board.h>
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#include "generic.h"
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static void ns9xxx_ack_irq_timer(unsigned int irq)
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{
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u32 tc = SYS_TC(irq - IRQ_TIMER0);
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/*
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* If the timer is programmed to halt on terminal count, the
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* timer must be disabled before clearing the interrupt.
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*/
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if (REGGET(tc, SYS_TCx, REN) == 0) {
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REGSET(tc, SYS_TCx, TEN, DIS);
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SYS_TC(irq - IRQ_TIMER0) = tc;
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}
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REGSET(tc, SYS_TCx, INTC, SET);
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SYS_TC(irq - IRQ_TIMER0) = tc;
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REGSET(tc, SYS_TCx, INTC, UNSET);
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SYS_TC(irq - IRQ_TIMER0) = tc;
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}
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static void (*ns9xxx_ack_irq_functions[NR_IRQS])(unsigned int) = {
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[IRQ_TIMER0] = ns9xxx_ack_irq_timer,
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[IRQ_TIMER1] = ns9xxx_ack_irq_timer,
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[IRQ_TIMER2] = ns9xxx_ack_irq_timer,
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[IRQ_TIMER3] = ns9xxx_ack_irq_timer,
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};
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static void ns9xxx_mask_irq(unsigned int irq)
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{
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/* XXX: better use cpp symbols */
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SYS_IC(irq / 4) &= ~(1 << (7 + 8 * (3 - (irq & 3))));
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}
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static void ns9xxx_ack_irq(unsigned int irq)
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{
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if (!ns9xxx_ack_irq_functions[irq]) {
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printk(KERN_ERR "no ack function for irq %u\n", irq);
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BUG();
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}
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ns9xxx_ack_irq_functions[irq](irq);
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SYS_ISRADDR = 0;
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}
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static void ns9xxx_maskack_irq(unsigned int irq)
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{
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ns9xxx_mask_irq(irq);
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ns9xxx_ack_irq(irq);
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}
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static void ns9xxx_unmask_irq(unsigned int irq)
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{
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/* XXX: better use cpp symbols */
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SYS_IC(irq / 4) |= 1 << (7 + 8 * (3 - (irq & 3)));
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}
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static struct irq_chip ns9xxx_chip = {
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.ack = ns9xxx_ack_irq,
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.mask = ns9xxx_mask_irq,
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.mask_ack = ns9xxx_maskack_irq,
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.unmask = ns9xxx_unmask_irq,
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};
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void __init ns9xxx_init_irq(void)
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{
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int i;
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/* disable all IRQs */
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for (i = 0; i < 8; ++i)
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SYS_IC(i) = (4 * i) << 24 | (4 * i + 1) << 16 |
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(4 * i + 2) << 8 | (4 * i + 3);
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/* simple interrupt prio table:
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* prio(x) < prio(y) <=> x < y
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*/
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for (i = 0; i < 32; ++i)
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SYS_IVA(i) = i;
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for (i = IRQ_WATCHDOG; i <= IRQ_EXT3; ++i) {
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set_irq_chip(i, &ns9xxx_chip);
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set_irq_handler(i, handle_level_irq);
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set_irq_flags(i, IRQF_VALID);
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}
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}
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