diff --git a/drivers/irqchip/irq-s3c24xx.c b/drivers/irqchip/irq-s3c24xx.c
index 9914abd..02b82db 100644
--- a/drivers/irqchip/irq-s3c24xx.c
+++ b/drivers/irqchip/irq-s3c24xx.c
@@ -43,6 +43,7 @@
 
 struct s3c_irq_data {
 	unsigned int type;
+	unsigned long offset;
 	unsigned long parent_irq;
 
 	/* data gets filled during init */
@@ -79,15 +80,15 @@
 
 static void s3c_irq_mask(struct irq_data *data)
 {
-	struct s3c_irq_intc *intc = data->domain->host_data;
+	struct s3c_irq_data *irq_data = irq_data_get_irq_chip_data(data);
+	struct s3c_irq_intc *intc = irq_data->intc;
 	struct s3c_irq_intc *parent_intc = intc->parent;
-	struct s3c_irq_data *irq_data = &intc->irqs[data->hwirq];
 	struct s3c_irq_data *parent_data;
 	unsigned long mask;
 	unsigned int irqno;
 
 	mask = __raw_readl(intc->reg_mask);
-	mask |= (1UL << data->hwirq);
+	mask |= (1UL << irq_data->offset);
 	__raw_writel(mask, intc->reg_mask);
 
 	if (parent_intc) {
@@ -104,14 +105,14 @@
 
 static void s3c_irq_unmask(struct irq_data *data)
 {
-	struct s3c_irq_intc *intc = data->domain->host_data;
+	struct s3c_irq_data *irq_data = irq_data_get_irq_chip_data(data);
+	struct s3c_irq_intc *intc = irq_data->intc;
 	struct s3c_irq_intc *parent_intc = intc->parent;
-	struct s3c_irq_data *irq_data = &intc->irqs[data->hwirq];
 	unsigned long mask;
 	unsigned int irqno;
 
 	mask = __raw_readl(intc->reg_mask);
-	mask &= ~(1UL << data->hwirq);
+	mask &= ~(1UL << irq_data->offset);
 	__raw_writel(mask, intc->reg_mask);
 
 	if (parent_intc) {
@@ -123,8 +124,9 @@
 
 static inline void s3c_irq_ack(struct irq_data *data)
 {
-	struct s3c_irq_intc *intc = data->domain->host_data;
-	unsigned long bitval = 1UL << data->hwirq;
+	struct s3c_irq_data *irq_data = irq_data_get_irq_chip_data(data);
+	struct s3c_irq_intc *intc = irq_data->intc;
+	unsigned long bitval = 1UL << irq_data->offset;
 
 	__raw_writel(bitval, intc->reg_pending);
 	if (intc->reg_intpnd)
@@ -291,8 +293,7 @@
 static void s3c_irq_demux(unsigned int irq, struct irq_desc *desc)
 {
 	struct irq_chip *chip = irq_desc_get_chip(desc);
-	struct s3c_irq_intc *intc = desc->irq_data.domain->host_data;
-	struct s3c_irq_data *irq_data = &intc->irqs[desc->irq_data.hwirq];
+	struct s3c_irq_data *irq_data = irq_desc_get_chip_data(desc);
 	struct s3c_irq_intc *sub_intc = irq_data->sub_intc;
 	unsigned long src;
 	unsigned long msk;
@@ -406,6 +407,7 @@
 
 	/* attach controller pointer to irq_data */
 	irq_data->intc = intc;
+	irq_data->offset = hw;
 
 	parent_intc = intc->parent;
 
@@ -444,6 +446,9 @@
 		pr_err("irq-s3c24xx: unsupported irqtype %d\n", irq_data->type);
 		return -EINVAL;
 	}
+
+	irq_set_chip_data(virq, irq_data);
+
 	set_irq_flags(virq, IRQF_VALID);
 
 	if (parent_intc && irq_data->type != S3C_IRQTYPE_NONE) {