1 files changed, 118 insertions, 0 deletions
diff --git a/arch/sh/boards/saturn/irq.c b/arch/sh/boards/saturn/irq.c
new file mode 100644
index 00000000000..15d1d3f0f78
--- /dev/null
+++ b/arch/sh/boards/saturn/irq.c
@@ -0,0 +1,118 @@
+/*
+ * arch/sh/boards/saturn/irq.c
+ *
+ * Copyright (C) 2002 Paul Mundt
+ *
+ * Released under the terms of the GNU GPL v2.0.
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+
+/*
+ * Interrupts map out as follows:
+ *
+ *  Vector	Name		Mask
+ *
+ * 	64	VBLANKIN	0x0001
+ * 	65	VBLANKOUT	0x0002
+ *	66	HBLANKIN	0x0004
+ *	67	TIMER0		0x0008
+ *	68	TIMER1		0x0010
+ *	69	DSPEND		0x0020
+ *	70	SOUNDREQUEST	0x0040
+ *	71	SYSTEMMANAGER	0x0080
+ *	72	PAD		0x0100
+ *	73	LEVEL2DMAEND	0x0200
+ *	74	LEVEL1DMAEND	0x0400
+ *	75	LEVEL0DMAEND	0x0800
+ *	76	DMAILLEGAL	0x1000
+ *	77	SRITEDRAWEND	0x2000
+ *	78	ABUS		0x8000
+ *
+ */
+#define SATURN_IRQ_MIN		64	/* VBLANKIN */
+#define SATURN_IRQ_MAX		78	/* ABUS */
+
+#define SATURN_IRQ_MASK		0xbfff
+
+static inline u32 saturn_irq_mask(unsigned int irq_nr)
+{
+	u32 mask;
+
+	mask = (1 << (irq_nr - SATURN_IRQ_MIN));
+	mask <<= (irq_nr == SATURN_IRQ_MAX);
+	mask &= SATURN_IRQ_MASK;
+
+	return mask;
+}
+
+static inline void mask_saturn_irq(unsigned int irq_nr)
+{
+	u32 mask;
+
+	mask = ctrl_inl(SATURN_IMR);
+	mask |= saturn_irq_mask(irq_nr);
+	ctrl_outl(mask, SATURN_IMR);
+}
+
+static inline void unmask_saturn_irq(unsigned int irq_nr)
+{
+	u32 mask;
+
+	mask = ctrl_inl(SATURN_IMR);
+	mask &= ~saturn_irq_mask(irq_nr);
+	ctrl_outl(mask, SATURN_IMR);
+}
+
+static void disable_saturn_irq(unsigned int irq_nr)
+{
+	mask_saturn_irq(irq_nr);
+}
+
+static void enable_saturn_irq(unsigned int irq_nr)
+{
+	unmask_saturn_irq(irq_nr);
+}
+
+static void mask_and_ack_saturn_irq(unsigned int irq_nr)
+{
+	mask_saturn_irq(irq_nr);
+}
+
+static void end_saturn_irq(unsigned int irq_nr)
+{
+	if (!(irq_desc[irq_nr].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
+		unmask_saturn_irq(irq_nr);
+}
+
+static unsigned int startup_saturn_irq(unsigned int irq_nr)
+{
+	unmask_saturn_irq(irq_nr);
+
+	return 0;
+}
+
+static void shutdown_saturn_irq(unsigned int irq_nr)
+{
+	mask_saturn_irq(irq_nr);
+}
+
+static struct hw_interrupt_type saturn_int = {
+	.typename	= "Saturn",
+	.enable		= enable_saturn_irq,
+	.disable	= disable_saturn_irq,
+	.ack		= mask_and_ack_saturn_irq,
+	.end		= end_saturn_irq,
+	.startup	= startup_saturn_irq,
+	.shutdown	= shutdown_saturn_irq,
+};
+
+int saturn_irq_demux(int irq_nr)
+{
+	/* FIXME */
+	return irq_nr;
+}
+