ARM: S3C64XX: Use chip_data to store the shift for EINTs

This makes all the functions that use the shift slightly smaller, one
instruction in most cases but more for ack() and maskack().
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/mach-s3c64xx/irq-eint.c

@@ -30,14 +30,14 @@
 #include <plat/pm.h>
 
 #define eint_offset(irq)	((irq) - IRQ_EINT(0))
-#define eint_irq_to_bit(irq)	(1 << eint_offset(irq))
+#define eint_irq_to_bit(irq)	((u32)(1 << eint_offset(irq)))
 
 static inline void s3c_irq_eint_mask(struct irq_data *data)
 {
 	u32 mask;
 
 	mask = __raw_readl(S3C64XX_EINT0MASK);
-	mask |= eint_irq_to_bit(data->irq);
+	mask |= (u32)data->chip_data;
 	__raw_writel(mask, S3C64XX_EINT0MASK);
 }
 
@@ -46,13 +46,13 @@ static void s3c_irq_eint_unmask(struct irq_data *data)
 	u32 mask;
 
 	mask = __raw_readl(S3C64XX_EINT0MASK);
-	mask &= ~eint_irq_to_bit(data->irq);
+	mask &= ~((u32)data->chip_data);
 	__raw_writel(mask, S3C64XX_EINT0MASK);
 }
 
 static inline void s3c_irq_eint_ack(struct irq_data *data)
 {
-	__raw_writel(eint_irq_to_bit(data->irq), S3C64XX_EINT0PEND);
+	__raw_writel((u32)data->chip_data, S3C64XX_EINT0PEND);
 }
 
 static void s3c_irq_eint_maskack(struct irq_data *data)
@@ -198,6 +198,7 @@ static int __init s3c64xx_init_irq_eint(void)
 
 	for (irq = IRQ_EINT(0); irq <= IRQ_EINT(27); irq++) {
 		set_irq_chip(irq, &s3c_irq_eint);
+		set_irq_chip_data(irq, (void *)eint_irq_to_bit(irq));
 		set_irq_handler(irq, handle_level_irq);
 		set_irq_flags(irq, IRQF_VALID);
 	}