diff --git a/arch/arm/mach-s3c24xx/irq.c b/arch/arm/mach-s3c24xx/irq.c
index ddb6752..2bb4a97 100644
--- a/arch/arm/mach-s3c24xx/irq.c
+++ b/arch/arm/mach-s3c24xx/irq.c
@@ -626,6 +626,160 @@
 	s3c24xx_init_intc(NULL, &init_eint[0], main_intc, 0x560000a4);
 }
 
+#ifdef CONFIG_CPU_S3C2412
+
+#define INTMSK(start, end) ((1 << ((end) + 1 - (start))) - 1)
+#define INTMSK_SUB(start, end) (INTMSK(start, end) << ((start - S3C2410_IRQSUB(0))))
+
+/* the s3c2412 changes the behaviour of IRQ_EINT0 through IRQ_EINT3 by
+ * having them turn up in both the INT* and the EINT* registers. Whilst
+ * both show the status, they both now need to be acked when the IRQs
+ * go off.
+*/
+
+static void
+s3c2412_irq_mask(struct irq_data *data)
+{
+	unsigned long bitval = 1UL << (data->irq - IRQ_EINT0);
+	unsigned long mask;
+
+	mask = __raw_readl(S3C2410_INTMSK);
+	__raw_writel(mask | bitval, S3C2410_INTMSK);
+
+	mask = __raw_readl(S3C2412_EINTMASK);
+	__raw_writel(mask | bitval, S3C2412_EINTMASK);
+}
+
+static inline void
+s3c2412_irq_ack(struct irq_data *data)
+{
+	unsigned long bitval = 1UL << (data->irq - IRQ_EINT0);
+
+	__raw_writel(bitval, S3C2412_EINTPEND);
+	__raw_writel(bitval, S3C2410_SRCPND);
+	__raw_writel(bitval, S3C2410_INTPND);
+}
+
+static inline void
+s3c2412_irq_maskack(struct irq_data *data)
+{
+	unsigned long bitval = 1UL << (data->irq - IRQ_EINT0);
+	unsigned long mask;
+
+	mask = __raw_readl(S3C2410_INTMSK);
+	__raw_writel(mask|bitval, S3C2410_INTMSK);
+
+	mask = __raw_readl(S3C2412_EINTMASK);
+	__raw_writel(mask | bitval, S3C2412_EINTMASK);
+
+	__raw_writel(bitval, S3C2412_EINTPEND);
+	__raw_writel(bitval, S3C2410_SRCPND);
+	__raw_writel(bitval, S3C2410_INTPND);
+}
+
+static void
+s3c2412_irq_unmask(struct irq_data *data)
+{
+	unsigned long bitval = 1UL << (data->irq - IRQ_EINT0);
+	unsigned long mask;
+
+	mask = __raw_readl(S3C2412_EINTMASK);
+	__raw_writel(mask & ~bitval, S3C2412_EINTMASK);
+
+	mask = __raw_readl(S3C2410_INTMSK);
+	__raw_writel(mask & ~bitval, S3C2410_INTMSK);
+}
+
+static struct irq_chip s3c2412_irq_eint0t4 = {
+	.irq_ack	= s3c2412_irq_ack,
+	.irq_mask	= s3c2412_irq_mask,
+	.irq_unmask	= s3c2412_irq_unmask,
+	.irq_set_wake	= s3c_irq_wake,
+	.irq_set_type	= s3c_irqext_type,
+};
+
+#define INTBIT(x)	(1 << ((x) - S3C2410_IRQSUB(0)))
+
+/* CF and SDI sub interrupts */
+
+static void s3c2412_irq_demux_cfsdi(unsigned int irq, struct irq_desc *desc)
+{
+	unsigned int subsrc, submsk;
+
+	subsrc = __raw_readl(S3C2410_SUBSRCPND);
+	submsk = __raw_readl(S3C2410_INTSUBMSK);
+
+	subsrc  &= ~submsk;
+
+	if (subsrc & INTBIT(IRQ_S3C2412_SDI))
+		generic_handle_irq(IRQ_S3C2412_SDI);
+
+	if (subsrc & INTBIT(IRQ_S3C2412_CF))
+		generic_handle_irq(IRQ_S3C2412_CF);
+}
+
+#define INTMSK_CFSDI	(1UL << (IRQ_S3C2412_CFSDI - IRQ_EINT0))
+#define SUBMSK_CFSDI	INTMSK_SUB(IRQ_S3C2412_SDI, IRQ_S3C2412_CF)
+
+static void s3c2412_irq_cfsdi_mask(struct irq_data *data)
+{
+	s3c_irqsub_mask(data->irq, INTMSK_CFSDI, SUBMSK_CFSDI);
+}
+
+static void s3c2412_irq_cfsdi_unmask(struct irq_data *data)
+{
+	s3c_irqsub_unmask(data->irq, INTMSK_CFSDI);
+}
+
+static void s3c2412_irq_cfsdi_ack(struct irq_data *data)
+{
+	s3c_irqsub_maskack(data->irq, INTMSK_CFSDI, SUBMSK_CFSDI);
+}
+
+static struct irq_chip s3c2412_irq_cfsdi = {
+	.name		= "s3c2412-cfsdi",
+	.irq_ack	= s3c2412_irq_cfsdi_ack,
+	.irq_mask	= s3c2412_irq_cfsdi_mask,
+	.irq_unmask	= s3c2412_irq_cfsdi_unmask,
+};
+
+static int s3c2412_irq_add(struct device *dev, struct subsys_interface *sif)
+{
+	unsigned int irqno;
+
+	for (irqno = IRQ_EINT0; irqno <= IRQ_EINT3; irqno++) {
+		irq_set_chip_and_handler(irqno, &s3c2412_irq_eint0t4,
+					 handle_edge_irq);
+		set_irq_flags(irqno, IRQF_VALID);
+	}
+
+	/* add demux support for CF/SDI */
+
+	irq_set_chained_handler(IRQ_S3C2412_CFSDI, s3c2412_irq_demux_cfsdi);
+
+	for (irqno = IRQ_S3C2412_SDI; irqno <= IRQ_S3C2412_CF; irqno++) {
+		irq_set_chip_and_handler(irqno, &s3c2412_irq_cfsdi,
+					 handle_level_irq);
+		set_irq_flags(irqno, IRQF_VALID);
+	}
+
+	return 0;
+}
+
+static struct subsys_interface s3c2412_irq_interface = {
+	.name		= "s3c2412_irq",
+	.subsys		= &s3c2412_subsys,
+	.add_dev	= s3c2412_irq_add,
+};
+
+static int s3c2412_irq_init(void)
+{
+	return subsys_interface_register(&s3c2412_irq_interface);
+}
+
+arch_initcall(s3c2412_irq_init);
+#endif
+
 #ifdef CONFIG_CPU_S3C2416
 static struct s3c_irq_data init_s3c2416base[32] = {
 	{ .type = S3C_IRQTYPE_EINT, }, /* EINT0 */