1 files changed, 19 insertions, 1 deletions

diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index f95553fa6872..7fef39ed5523 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -39,6 +39,9 @@ struct device_node;
 struct irq_domain;
 struct of_device_id;
 
+/* Number of irqs reserved for a legacy isa controller */
+#define NUM_ISA_INTERRUPTS      16
+
 /* This type is the placeholder for a hardware interrupt number. It has to
  * be big enough to enclose whatever representation is used by a given
  * platform.
@@ -98,6 +101,11 @@ struct irq_domain {
         union {
                 struct {
                         unsigned int size;
+                        unsigned int first_irq;
+                        irq_hw_number_t first_hwirq;
+                } legacy;
+                struct {
+                        unsigned int size;
                         unsigned int *revmap;
                 } linear;
                 struct radix_tree_root tree;
@@ -117,6 +125,9 @@ struct irq_domain {
 #ifdef CONFIG_IRQ_DOMAIN
 #ifdef CONFIG_PPC
 struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
+                                         unsigned int size,
+                                         unsigned int first_irq,
+                                         irq_hw_number_t first_hwirq,
                                          struct irq_domain_ops *ops,
                                          void *host_data);
 struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
@@ -130,11 +141,18 @@ struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
                                          struct irq_domain_ops *ops,
                                          void *host_data);
 
-
 extern struct irq_domain *irq_find_host(struct device_node *node);
 extern void irq_set_default_host(struct irq_domain *host);
 extern void irq_set_virq_count(unsigned int count);
 
+static inline struct irq_domain *irq_domain_add_legacy_isa(
+                                struct device_node *of_node,
+                                struct irq_domain_ops *ops,
+                                void *host_data)
+{
+        return irq_domain_add_legacy(of_node, NUM_ISA_INTERRUPTS, 0, 0, ops,
+                                     host_data);
+}
 
 extern unsigned int irq_create_mapping(struct irq_domain *host,
                                        irq_hw_number_t hwirq);