ARM: shmobile: add GPIO IRQ macro

R-Car series gpio_rcar driver can control GPIO IRQ today.
It needs base IRQ number for gpio_rcar_config :: .irq_base
This patch adds macro for GPIO IRQ.
This patch was tested on Bock-W board

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/mach-shmobile/include/mach/irqs.h

@@ -16,4 +16,9 @@
 #define IRQPIN_BASE		2000
 #define irq_pin(nr)		((nr) + IRQPIN_BASE)
 
+/* GPIO IRQ */
+#define _GPIO_IRQ_BASE		2500
+#define GPIO_IRQ_BASE(x)	(_GPIO_IRQ_BASE + (32 * x))
+#define GPIO_IRQ(x, y)		(_GPIO_IRQ_BASE + (32 * x) + y)
+
 #endif /* __ASM_MACH_IRQS_H */