By default IRQs are expected to be active high in AXON. So, change
the current default active level to positive instead of negative.
Firmware needs to pass sense levels of IRQs. Current version of
firmware doesn't seem to be passing correctly in the device-tree.

Signed-off-by: Murali Iyer <mniyer@us.ibm.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

Index: linux-2.6.16/arch/powerpc/kernel/prom.c
===================================================================
--- linux-2.6.16.orig/arch/powerpc/kernel/prom.c
+++ linux-2.6.16/arch/powerpc/kernel/prom.c
@@ -1250,7 +1250,7 @@ void __init prom_get_irq_senses(unsigned
 	int i, j;
 
 	/* default to level-triggered */
-	memset(senses, IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE, max - off);
+	memset(senses, IRQ_SENSE_LEVEL | IRQ_POLARITY_POSITIVE, max - off);
 
 	for (np = allnodes; np != 0; np = np->allnext) {
 		for (j = 0; j < np->n_intrs; j++) {

--