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m68k/mac: Optimize interrupts using chain handlers

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Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Geert Uytterhoeven
2011-08-10 12:48:29 +02:00
parent ddc7fd25d0
commit 9145db564e
4 changed files with 300 additions and 65 deletions
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38
arch/m68k/mac/baboon.c
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@@ -56,6 +56,39 @@ void __init baboon_init(void)
* Baboon interrupt handler. This works a lot like a VIA.
*/
#ifdef CONFIG_GENERIC_HARDIRQS
static void baboon_irq(unsigned int irq, struct irq_desc *desc)
{
int irq_bit, irq_num;
unsigned char events;
#ifdef DEBUG_IRQS
printk("baboon_irq: mb_control %02X mb_ifr %02X mb_status %02X\n",
(uint) baboon->mb_control, (uint) baboon->mb_ifr,
(uint) baboon->mb_status);
#endif
events = baboon->mb_ifr & 0x07;
if (!events)
return;
irq_num = IRQ_BABOON_0;
irq_bit = 1;
do {
if (events & irq_bit) {
baboon->mb_ifr &= ~irq_bit;
generic_handle_irq(irq_num);
}
irq_bit <<= 1;
irq_num++;
} while(events >= irq_bit);
#if 0
if (baboon->mb_ifr & 0x02) macide_ack_intr(NULL);
/* for now we need to smash all interrupts */
baboon->mb_ifr &= ~events;
#endif
}
#else
static irqreturn_t baboon_irq(int irq, void *dev_id)
{
int irq_bit, irq_num;
@@ -87,6 +120,7 @@ static irqreturn_t baboon_irq(int irq, void *dev_id)
#endif
return IRQ_HANDLED;
}
#endif
/*
* Register the Baboon interrupt dispatcher on nubus slot $C.
@@ -95,8 +129,12 @@ static irqreturn_t baboon_irq(int irq, void *dev_id)
void __init baboon_register_interrupts(void)
{
baboon_disabled = 0;
#ifdef CONFIG_GENERIC_HARDIRQS
irq_set_chained_handler(IRQ_NUBUS_C, baboon_irq);
#else
if (request_irq(IRQ_NUBUS_C, baboon_irq, 0, "baboon", (void *)baboon))
pr_err("Couldn't register baboon interrupt\n");
#endif
}
/*