ed6f598723
prio2irq(0) is the highest prioritized interrupt. For now there is no
binary change intended.
If you intend to change the priorisation, you have to assert:
∀ x ∈ {0, 1, ⋯ 31}: (irq2prio ∘ prio2irq)(x) = x
Signed-off-by: Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com>
119 lines
2.7 KiB
C
119 lines
2.7 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 <linux/kernel_stat.h>
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#include <asm/io.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-common.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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/* simple interrupt prio table: prio(x) < prio(y) <=> x < y */
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#define irq2prio(i) (i)
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#define prio2irq(p) (p)
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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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int prio = irq2prio(irq);
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u32 ic = __raw_readl(SYS_IC(prio / 4));
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ic &= ~(1 << (7 + 8 * (3 - (prio & 3))));
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__raw_writel(ic, SYS_IC(prio / 4));
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}
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static void ns9xxx_ack_irq(unsigned int irq)
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{
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__raw_writel(0, SYS_ISRADDR);
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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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int prio = irq2prio(irq);
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u32 ic = __raw_readl(SYS_IC(prio / 4));
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ic |= 1 << (7 + 8 * (3 - (prio & 3)));
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__raw_writel(ic, SYS_IC(prio / 4));
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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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#if 0
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#define handle_irq handle_level_irq
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#else
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void handle_prio_irq(unsigned int irq, struct irq_desc *desc)
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{
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unsigned int cpu = smp_processor_id();
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struct irqaction *action;
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irqreturn_t action_ret;
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spin_lock(&desc->lock);
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if (unlikely(desc->status & IRQ_INPROGRESS))
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goto out_unlock;
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desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
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kstat_cpu(cpu).irqs[irq]++;
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action = desc->action;
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if (unlikely(!action || (desc->status & IRQ_DISABLED)))
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goto out_unlock;
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desc->status |= IRQ_INPROGRESS;
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spin_unlock(&desc->lock);
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action_ret = handle_IRQ_event(irq, action);
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spin_lock(&desc->lock);
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desc->status &= ~IRQ_INPROGRESS;
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if (!(desc->status & IRQ_DISABLED) && desc->chip->ack)
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desc->chip->ack(irq);
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out_unlock:
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spin_unlock(&desc->lock);
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}
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#define handle_irq handle_prio_irq
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#endif
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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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__raw_writel(prio2irq(4 * i) << 24 |
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prio2irq(4 * i + 1) << 16 |
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prio2irq(4 * i + 2) << 8 |
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prio2irq(4 * i + 3),
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SYS_IC(i));
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for (i = 0; i < 32; ++i)
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__raw_writel(prio2irq(i), SYS_IVA(i));
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for (i = 0; i <= 31; ++i) {
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set_irq_chip(i, &ns9xxx_chip);
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set_irq_handler(i, handle_irq);
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set_irq_flags(i, IRQF_VALID);
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}
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}
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