arm/irq: Add helper function for setting interrupt type

Add a helper function to set edge/level type information for an
interrupt.

Signed-off-by: Parth Dixit <parth.dixit@linaro.org>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

xen/arch/arm/irq.c

@@ -655,27 +655,32 @@ unlock:
     return ret;
 }
 
-int platform_get_irq(const struct dt_device_node *device, int index)
+int irq_set_type(unsigned int irq, unsigned int type)
 {
-    struct dt_irq dt_irq;
-    unsigned int type, irq;
     int res;
 
-    res = dt_device_get_irq(device, index, &dt_irq);
-    if ( res )
-        return -1;
-
-    irq = dt_irq.irq;
-    type = dt_irq.type;
-
     /* Setup the IRQ type */
     if ( irq < NR_LOCAL_IRQS )
         res = irq_local_set_type(irq, type);
     else
         res = irq_set_spi_type(irq, type);
 
-    if ( res )
-            return -1;
+    return res;
+}
+
+int platform_get_irq(const struct dt_device_node *device, int index)
+{
+    struct dt_irq dt_irq;
+    unsigned int type, irq;
+
+    if ( dt_device_get_irq(device, index, &dt_irq) )
+        return -1;
+
+    irq = dt_irq.irq;
+    type = dt_irq.type;
+
+    if ( irq_set_type(irq, type) )
+        return -1;
 
     return irq;
 }

xen/include/asm-arm/irq.h

@@ -52,6 +52,8 @@ void arch_move_irqs(struct vcpu *v);
 /* Set IRQ type for an SPI */
 int irq_set_spi_type(unsigned int spi, unsigned int type);
 
+int irq_set_type(unsigned int irq, unsigned int type);
+
 int platform_get_irq(const struct dt_device_node *device, int index);
 
 void irq_set_affinity(struct irq_desc *desc, const cpumask_t *cpu_mask);