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-rw-r--r--arch/arm/mach-s3c2412/irq.c58
1 files changed, 58 insertions, 0 deletions
diff --git a/arch/arm/mach-s3c2412/irq.c b/arch/arm/mach-s3c2412/irq.c
index f0d66828f96..e9d0c769f5d 100644
--- a/arch/arm/mach-s3c2412/irq.c
+++ b/arch/arm/mach-s3c2412/irq.c
@@ -38,6 +38,9 @@
#include <asm/plat-s3c24xx/irq.h>
#include <asm/plat-s3c24xx/pm.h>
+#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
@@ -105,6 +108,51 @@ static struct irq_chip s3c2412_irq_eint0t4 = {
.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))
+ desc_handle_irq(IRQ_S3C2412_SDI, irq_desc + IRQ_S3C2412_SDI);
+
+ if (subsrc & INTBIT(IRQ_S3C2412_CF))
+ desc_handle_irq(IRQ_S3C2412_CF, irq_desc + 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(unsigned int irqno)
+{
+ s3c_irqsub_mask(irqno, INTMSK_CFSDI, SUBMSK_CFSDI);
+}
+
+static void s3c2412_irq_cfsdi_unmask(unsigned int irqno)
+{
+ s3c_irqsub_unmask(irqno, INTMSK_CFSDI);
+}
+
+static void s3c2412_irq_cfsdi_ack(unsigned int irqno)
+{
+ s3c_irqsub_maskack(irqno, INTMSK_CFSDI, SUBMSK_CFSDI);
+}
+
+static struct irq_chip s3c2412_irq_cfsdi = {
+ .name = "s3c2412-cfsdi",
+ .ack = s3c2412_irq_cfsdi_ack,
+ .mask = s3c2412_irq_cfsdi_mask,
+ .unmask = s3c2412_irq_cfsdi_unmask,
+};
+
static int s3c2412_irq_add(struct sys_device *sysdev)
{
unsigned int irqno;
@@ -115,6 +163,16 @@ static int s3c2412_irq_add(struct sys_device *sysdev)
set_irq_flags(irqno, IRQF_VALID);
}
+ /* add demux support for CF/SDI */
+
+ set_irq_chained_handler(IRQ_S3C2412_CFSDI, s3c2412_irq_demux_cfsdi);
+
+ for (irqno = IRQ_S3C2412_SDI; irqno <= IRQ_S3C2412_CF; irqno++) {
+ set_irq_chip(irqno, &s3c2412_irq_cfsdi);
+ set_irq_handler(irqno, handle_level_irq);
+ set_irq_flags(irqno, IRQF_VALID);
+ }
+
return 0;
}