[POWERPC] 4xx: UIC add mask_ack callback

This adds uic_mask_ack_irq() callback to PowerPC 4xx uic code
to avoid kernel crash. It is used for edge-triggered interrupts
by handle_uic_irq().

Signed-off-by: Valentine Barshak <vbarshak@ru.mvista.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>

diff --git a/arch/powerpc/sysdev/uic.c b/arch/powerpc/sysdev/uic.c
index 5149716..847a549 100644 (file)
--- a/arch/powerpc/sysdev/uic.c
+++ b/arch/powerpc/sysdev/uic.c
@@ -97,6 +97,22 @@ static void uic_ack_irq(unsigned int virq)
        spin_unlock_irqrestore(&uic->lock, flags);
 }
 
+static void uic_mask_ack_irq(unsigned int virq)
+{
+       struct uic *uic = get_irq_chip_data(virq);
+       unsigned int src = uic_irq_to_hw(virq);
+       unsigned long flags;
+       u32 er, sr;
+
+       sr = 1 << (31-src);
+       spin_lock_irqsave(&uic->lock, flags);
+       er = mfdcr(uic->dcrbase + UIC_ER);
+       er &= ~sr;
+       mtdcr(uic->dcrbase + UIC_ER, er);
+       mtdcr(uic->dcrbase + UIC_SR, sr);
+       spin_unlock_irqrestore(&uic->lock, flags);
+}
+
 static int uic_set_irq_type(unsigned int virq, unsigned int flow_type)
 {
        struct uic *uic = get_irq_chip_data(virq);
@@ -152,7 +168,7 @@ static struct irq_chip uic_irq_chip = {
        .typename       = " UIC  ",
        .unmask         = uic_unmask_irq,
        .mask           = uic_mask_irq,
-/*     .mask_ack       = uic_mask_irq_and_ack, */
+       .mask_ack       = uic_mask_ack_irq,
        .ack            = uic_ack_irq,
        .set_type       = uic_set_irq_type,
 };