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microblaze: Fix level interrupt ACKing

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Level interrupts need to be ack'd in the unmask handler, as in powerpc.
Among other issues, this bug causes the system clock to appear to run at
double-speed.

Signed-off-by: Steven J. Magnani <steve@digidescorp.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
steve@digidescorp.com 2009-11-17 08:43:39 -06:00 committed by Michal Simek
parent 833d0d8da4
commit 33d9ff5985
1 changed files with 9 additions and 1 deletions
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10
arch/microblaze/kernel/intc.c
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@ -42,8 +42,16 @@ unsigned int nr_irq;
static void intc_enable_or_unmask(unsigned int irq)
{
unsigned long mask = 1 << irq;
pr_debug("enable_or_unmask: %d\n", irq);
out_be32(INTC_BASE + SIE, 1 << irq);
out_be32(INTC_BASE + SIE, mask);
/* ack level irqs because they can't be acked during
* ack function since the handle_level_irq function
* acks the irq before calling the interrupt handler
*/
if (irq_desc[irq].status & IRQ_LEVEL)
out_be32(INTC_BASE + IAR, mask);
}
static void intc_disable_or_mask(unsigned int irq)