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 000000000000..15d1d3f0f787
--- /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;
+}
+