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microblaze: Fix level interrupt ACKing 

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>
hifive-unleashed-5.1
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)