ARM: shmobile: bockw: define FPGA address and rename iomem variable

Bock-W board will needs more board specific ioremap() method.
This patch tidyup current FPGA specific settings
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/mach-shmobile/board-bockw.c

@@ -46,10 +46,11 @@ static const struct pinctrl_map bockw_pinctrl_map[] = {
 				  "scif0_ctrl", "scif0"),
 };
 
+#define FPGA	0x18200000
 #define IRQ0MR	0x30
 static void __init bockw_init(void)
 {
-	void __iomem *fpga;
+	void __iomem *base;
 
 	r8a7778_clock_init();
 	r8a7778_init_irq_extpin(1);
@@ -59,8 +60,8 @@ static void __init bockw_init(void)
 				  ARRAY_SIZE(bockw_pinctrl_map));
 	r8a7778_pinmux_init();
 
-	fpga = ioremap_nocache(0x18200000, SZ_1M);
-	if (fpga) {
+	base = ioremap_nocache(FPGA, SZ_1M);
+	if (base) {
 		/*
 		 * CAUTION
 		 *
@@ -68,10 +69,10 @@ static void __init bockw_init(void)
 		 * it should be cared in the future
 		 * Now, it is assuming IRQ0 was used only from SMSC.
 		 */
-		u16 val = ioread16(fpga + IRQ0MR);
+		u16 val = ioread16(base + IRQ0MR);
 		val &= ~(1 << 4); /* enable SMSC911x */
-		iowrite16(val, fpga + IRQ0MR);
-		iounmap(fpga);
+		iowrite16(val, base + IRQ0MR);
+		iounmap(base);
 
 		platform_device_register_resndata(
 			&platform_bus, "smsc911x", -1,