1 files changed, 102 insertions, 0 deletions

diff --git a/arch/sh/boards/mach-systemh/irq.c b/arch/sh/boards/mach-systemh/irq.c
new file mode 100644
index 000000000000..0ba2fe674c47
--- /dev/null
+++ b/arch/sh/boards/mach-systemh/irq.c
@@ -0,0 +1,102 @@
+/*
+ * linux/arch/sh/boards/renesas/systemh/irq.c
+ *
+ * Copyright (C) 2000  Kazumoto Kojima
+ *
+ * Hitachi SystemH Support.
+ *
+ * Modified for 7751 SystemH by
+ * Jonathan Short.
+ */
+
+#include <linux/init.h>
+#include <linux/irq.h>
+
+#include <linux/hdreg.h>
+#include <linux/ide.h>
+#include <asm/io.h>
+#include <asm/systemh7751.h>
+#include <asm/smc37c93x.h>
+
+/* address of external interrupt mask register
+ * address must be set prior to use these (maybe in init_XXX_irq())
+ * XXX : is it better to use .config than specifying it in code? */
+static unsigned long *systemh_irq_mask_register = (unsigned long *)0xB3F10004;
+static unsigned long *systemh_irq_request_register = (unsigned long *)0xB3F10000;
+
+/* forward declaration */
+static unsigned int startup_systemh_irq(unsigned int irq);
+static void shutdown_systemh_irq(unsigned int irq);
+static void enable_systemh_irq(unsigned int irq);
+static void disable_systemh_irq(unsigned int irq);
+static void mask_and_ack_systemh(unsigned int);
+static void end_systemh_irq(unsigned int irq);
+
+/* hw_interrupt_type */
+static struct hw_interrupt_type systemh_irq_type = {
+        .typename = " SystemH Register",
+        .startup = startup_systemh_irq,
+        .shutdown = shutdown_systemh_irq,
+        .enable = enable_systemh_irq,
+        .disable = disable_systemh_irq,
+        .ack = mask_and_ack_systemh,
+        .end = end_systemh_irq
+};
+
+static unsigned int startup_systemh_irq(unsigned int irq)
+{
+        enable_systemh_irq(irq);
+        return 0; /* never anything pending */
+}
+
+static void shutdown_systemh_irq(unsigned int irq)
+{
+        disable_systemh_irq(irq);
+}
+
+static void disable_systemh_irq(unsigned int irq)
+{
+        if (systemh_irq_mask_register) {
+                unsigned long val, mask = 0x01 << 1;
+
+                /* Clear the "irq"th bit in the mask and set it in the request */
+                val = ctrl_inl((unsigned long)systemh_irq_mask_register);
+                val &= ~mask;
+                ctrl_outl(val, (unsigned long)systemh_irq_mask_register);
+
+                val = ctrl_inl((unsigned long)systemh_irq_request_register);
+                val |= mask;
+                ctrl_outl(val, (unsigned long)systemh_irq_request_register);
+        }
+}
+
+static void enable_systemh_irq(unsigned int irq)
+{
+        if (systemh_irq_mask_register) {
+                unsigned long val, mask = 0x01 << 1;
+
+                /* Set "irq"th bit in the mask register */
+                val = ctrl_inl((unsigned long)systemh_irq_mask_register);
+                val |= mask;
+                ctrl_outl(val, (unsigned long)systemh_irq_mask_register);
+        }
+}
+
+static void mask_and_ack_systemh(unsigned int irq)
+{
+        disable_systemh_irq(irq);
+}
+
+static void end_systemh_irq(unsigned int irq)
+{
+        if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+                enable_systemh_irq(irq);
+}
+
+void make_systemh_irq(unsigned int irq)
+{
+        disable_irq_nosync(irq);
+        irq_desc[irq].chip = &systemh_irq_type;
+        disable_systemh_irq(irq);
+}
+