sparc: Implement irq_of_parse_and_map() and irq_dispose_mapping().

This allows more OF layer code to be shared between powerpc and
sparc.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

arch/sparc/include/asm/prom.h

@@ -96,6 +96,14 @@ static inline void of_node_put(struct device_node *node)
 {
 }
 
+/* These routines are here to provide compatibility with how powerpc
+ * handles IRQ mapping for OF device nodes.  We precompute and permanently
+ * register them in the of_device objects, whereas powerpc computes them
+ * on request.
+ */
+extern int irq_of_parse_and_map(struct device_node *node, int index);
+#define irq_dispose_mapping(irq) do { } while (0)
+
 /*
  * NB:  This is here while we transition from using asm/prom.h
  * to linux/of.h

arch/sparc/kernel/of_device.c

@@ -29,6 +29,17 @@ struct of_device *of_find_device_by_node(struct device_node *dp)
 }
 EXPORT_SYMBOL(of_find_device_by_node);
 
+int irq_of_parse_and_map(struct device_node *node, int index)
+{
+	struct of_device *op = of_find_device_by_node(node);
+
+	if (!op || index >= op->num_irqs)
+		return 0xffffffff;
+
+	return op->irqs[index];
+}
+EXPORT_SYMBOL(irq_of_parse_and_map);
+
 #ifdef CONFIG_PCI
 struct bus_type ebus_bus_type;
 EXPORT_SYMBOL(ebus_bus_type);

arch/sparc64/kernel/of_device.c

@@ -55,6 +55,17 @@ struct of_device *of_find_device_by_node(struct device_node *dp)
 }
 EXPORT_SYMBOL(of_find_device_by_node);
 
+int irq_of_parse_and_map(struct device_node *node, int index)
+{
+	struct of_device *op = of_find_device_by_node(node);
+
+	if (!op || index >= op->num_irqs)
+		return 0xffffffff;
+
+	return op->irqs[index];
+}
+EXPORT_SYMBOL(irq_of_parse_and_map);
+
 #ifdef CONFIG_PCI
 struct bus_type ebus_bus_type;
 EXPORT_SYMBOL(ebus_bus_type);