xtensa: add MX irqchip

MX is an interrupt distributor used in some SMP-capable xtensa
configurations.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>

1 files changed, 8 insertions, 0 deletions

diff --git a/arch/xtensa/kernel/irq.c b/arch/xtensa/kernel/irq.c
index 3cef58e28332..7d49730f4056 100644
--- a/arch/xtensa/kernel/irq.c
+++ b/arch/xtensa/kernel/irq.c
@@ -123,6 +123,14 @@ unsigned xtensa_map_ext_irq(unsigned ext_irq)
         return XCHAL_NUM_INTERRUPTS;
 }
 
+unsigned xtensa_get_ext_irq_no(unsigned irq)
+{
+        unsigned mask = (XCHAL_INTTYPE_MASK_EXTERN_EDGE |
+                XCHAL_INTTYPE_MASK_EXTERN_LEVEL) &
+                ((1u << irq) - 1);
+        return hweight32(mask);
+}
+
 void __init init_IRQ(void)
 {
 #ifdef CONFIG_OF