mips: ralink: rt288x: define RT2880_SYSC_BASE with __iomem

 So that RT2880_SYSC_BASE can be used later in multiple functions without
 needing to repeat this __iomem declaration each time
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/include/asm/mach-ralink/rt288x.h

@@ -11,7 +11,8 @@
 #ifndef _RT288X_REGS_H_
 #define _RT288X_REGS_H_
 
-#define RT2880_SYSC_BASE		0x00300000
+#define IOMEM(x)			((void __iomem *)(KSEG1ADDR(x)))
+#define RT2880_SYSC_BASE		IOMEM(0x00300000)
 
 #define SYSC_REG_CHIP_NAME0		0x00
 #define SYSC_REG_CHIP_NAME1		0x04

arch/mips/ralink/rt288x.c

@@ -59,15 +59,14 @@ void __init ralink_of_remap(void)
 
 void __init prom_soc_init(struct ralink_soc_info *soc_info)
 {
-	void __iomem *sysc = (void __iomem *) KSEG1ADDR(RT2880_SYSC_BASE);
 	const char *name;
 	u32 n0;
 	u32 n1;
 	u32 id;
 
-	n0 = __raw_readl(sysc + SYSC_REG_CHIP_NAME0);
-	n1 = __raw_readl(sysc + SYSC_REG_CHIP_NAME1);
-	id = __raw_readl(sysc + SYSC_REG_CHIP_ID);
+	n0 = __raw_readl(RT2880_SYSC_BASE + SYSC_REG_CHIP_NAME0);
+	n1 = __raw_readl(RT2880_SYSC_BASE + SYSC_REG_CHIP_NAME1);
+	id = __raw_readl(RT2880_SYSC_BASE + SYSC_REG_CHIP_ID);
 
 	if (n0 == RT2880_CHIP_NAME0 && n1 == RT2880_CHIP_NAME1) {
 		soc_info->compatible = "ralink,r2880-soc";