diff --git a/drivers/rapidio/rio.c b/drivers/rapidio/rio.c
index c40665a..d7b68cc 100644
--- a/drivers/rapidio/rio.c
+++ b/drivers/rapidio/rio.c
@@ -33,6 +33,7 @@
 
 static LIST_HEAD(rio_mports);
 static unsigned char next_portid;
+static DEFINE_SPINLOCK(rio_mmap_lock);
 
 /**
  * rio_local_get_device_id - Get the base/extended device id for a port
@@ -398,6 +399,49 @@
 EXPORT_SYMBOL_GPL(rio_release_inb_pwrite);
 
 /**
+ * rio_map_inb_region -- Map inbound memory region.
+ * @mport: Master port.
+ * @lstart: physical address of memory region to be mapped
+ * @rbase: RIO base address assigned to this window
+ * @size: Size of the memory region
+ * @rflags: Flags for mapping.
+ *
+ * Return: 0 -- Success.
+ *
+ * This function will create the mapping from RIO space to local memory.
+ */
+int rio_map_inb_region(struct rio_mport *mport, dma_addr_t local,
+			u64 rbase, u32 size, u32 rflags)
+{
+	int rc = 0;
+	unsigned long flags;
+
+	if (!mport->ops->map_inb)
+		return -1;
+	spin_lock_irqsave(&rio_mmap_lock, flags);
+	rc = mport->ops->map_inb(mport, local, rbase, size, rflags);
+	spin_unlock_irqrestore(&rio_mmap_lock, flags);
+	return rc;
+}
+EXPORT_SYMBOL_GPL(rio_map_inb_region);
+
+/**
+ * rio_unmap_inb_region -- Unmap the inbound memory region
+ * @mport: Master port
+ * @lstart: physical address of memory region to be unmapped
+ */
+void rio_unmap_inb_region(struct rio_mport *mport, dma_addr_t lstart)
+{
+	unsigned long flags;
+	if (!mport->ops->unmap_inb)
+		return;
+	spin_lock_irqsave(&rio_mmap_lock, flags);
+	mport->ops->unmap_inb(mport, lstart);
+	spin_unlock_irqrestore(&rio_mmap_lock, flags);
+}
+EXPORT_SYMBOL_GPL(rio_unmap_inb_region);
+
+/**
  * rio_mport_get_physefb - Helper function that returns register offset
  *                      for Physical Layer Extended Features Block.
  * @port: Master port to issue transaction
diff --git a/include/linux/rio.h b/include/linux/rio.h
index ba382f2..4d1a104 100644
--- a/include/linux/rio.h
+++ b/include/linux/rio.h
@@ -301,6 +301,8 @@
  * @add_outb_message: Callback to add a message to an outbound mailbox queue.
  * @add_inb_buffer: Callback to	add a buffer to an inbound mailbox queue.
  * @get_inb_message: Callback to get a message from an inbound mailbox queue.
+ * @map_inb: Callback to map RapidIO address region into local memory space.
+ * @unmap_inb: Callback to unmap RapidIO address region mapped with map_inb().
  */
 struct rio_ops {
 	int (*lcread) (struct rio_mport *mport, int index, u32 offset, int len,
@@ -323,6 +325,9 @@
 				 int mbox, void *buffer, size_t len);
 	int (*add_inb_buffer)(struct rio_mport *mport, int mbox, void *buf);
 	void *(*get_inb_message)(struct rio_mport *mport, int mbox);
+	int (*map_inb)(struct rio_mport *mport, dma_addr_t lstart,
+			u64 rstart, u32 size, u32 flags);
+	void (*unmap_inb)(struct rio_mport *mport, dma_addr_t lstart);
 };
 
 #define RIO_RESOURCE_MEM	0x00000100
diff --git a/include/linux/rio_drv.h b/include/linux/rio_drv.h
index 31ad146..b75c059 100644
--- a/include/linux/rio_drv.h
+++ b/include/linux/rio_drv.h
@@ -365,6 +365,11 @@
 int rio_request_region(struct rio_dev *, int, char *);
 void rio_release_region(struct rio_dev *, int);
 
+/* Memory mapping functions */
+extern int rio_map_inb_region(struct rio_mport *mport, dma_addr_t local,
+			u64 rbase, u32 size, u32 rflags);
+extern void rio_unmap_inb_region(struct rio_mport *mport, dma_addr_t lstart);
+
 /* Port-Write management */
 extern int rio_request_inb_pwrite(struct rio_dev *,
 			int (*)(struct rio_dev *, union rio_pw_msg*, int));