diff --git a/include/linux/irq.h b/include/linux/irq.h
index ed1135d..0fecd95 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -686,6 +686,8 @@
  * struct irq_chip_generic - Generic irq chip data structure
  * @lock:		Lock to protect register and cache data access
  * @reg_base:		Register base address (virtual)
+ * @reg_readl:		Alternate I/O accessor (defaults to readl if NULL)
+ * @reg_writel:		Alternate I/O accessor (defaults to writel if NULL)
  * @irq_base:		Interrupt base nr for this chip
  * @irq_cnt:		Number of interrupts handled by this chip
  * @mask_cache:		Cached mask register shared between all chip types
@@ -710,6 +712,8 @@
 struct irq_chip_generic {
 	raw_spinlock_t		lock;
 	void __iomem		*reg_base;
+	u32			(*reg_readl)(void __iomem *addr);
+	void			(*reg_writel)(u32 val, void __iomem *addr);
 	unsigned int		irq_base;
 	unsigned int		irq_cnt;
 	u32			mask_cache;
@@ -818,13 +822,19 @@
 static inline void irq_reg_writel(struct irq_chip_generic *gc,
 				  u32 val, int reg_offset)
 {
-	writel(val, gc->reg_base + reg_offset);
+	if (gc->reg_writel)
+		gc->reg_writel(val, gc->reg_base + reg_offset);
+	else
+		writel(val, gc->reg_base + reg_offset);
 }
 
 static inline u32 irq_reg_readl(struct irq_chip_generic *gc,
 				int reg_offset)
 {
-	return readl(gc->reg_base + reg_offset);
+	if (gc->reg_readl)
+		return gc->reg_readl(gc->reg_base + reg_offset);
+	else
+		return readl(gc->reg_base + reg_offset);
 }
 
 #endif /* _LINUX_IRQ_H */