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ns9xxx: make use of the chip's irq priorisation 

The irq controller automatically masks the current and all lower prioritised
tasks until the current irq is acked.

Signed-off-by: Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com>
This commit is contained in:
Uwe Kleine-König 2008-02-29 13:27:53 +01:00
parent a287453e37
commit 5e69b945f2
1 changed files with 39 additions and 1 deletions
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40
arch/arm/mach-ns9xxx/irq.c
View File

@ -9,6 +9,7 @@
* the Free Software Foundation.
*/
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <asm/io.h>
#include <asm/mach/irq.h>
#include <asm/mach-types.h>
@ -52,6 +53,43 @@ static struct irq_chip ns9xxx_chip = {
.unmask = ns9xxx_unmask_irq,
};
#if 0
#define handle_irq handle_level_irq
#else
void handle_prio_irq(unsigned int irq, struct irq_desc *desc)
{
unsigned int cpu = smp_processor_id();
struct irqaction *action;
irqreturn_t action_ret;
spin_lock(&desc->lock);
if (unlikely(desc->status & IRQ_INPROGRESS))
goto out_unlock;
desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
kstat_cpu(cpu).irqs[irq]++;
action = desc->action;
if (unlikely(!action || (desc->status & IRQ_DISABLED)))
goto out_unlock;
desc->status |= IRQ_INPROGRESS;
spin_unlock(&desc->lock);
action_ret = handle_IRQ_event(irq, action);
spin_lock(&desc->lock);
desc->status &= ~IRQ_INPROGRESS;
if (!(desc->status & IRQ_DISABLED) && desc->chip->ack)
desc->chip->ack(irq);
out_unlock:
spin_unlock(&desc->lock);
}
#define handle_irq handle_prio_irq
#endif
void __init ns9xxx_init_irq(void)
{
int i;
@ -69,7 +107,7 @@ void __init ns9xxx_init_irq(void)
for (i = 0; i <= 31; ++i) {
set_irq_chip(i, &ns9xxx_chip);
set_irq_handler(i, handle_level_irq);
set_irq_handler(i, handle_irq);
set_irq_flags(i, IRQF_VALID);
}
}