1 files changed, 98 insertions, 0 deletions

diff --git a/arch/mips/kernel/irq-rm7000.c b/arch/mips/kernel/irq-rm7000.c
new file mode 100644
index 000000000000..f5d779fd0355
--- /dev/null
+++ b/arch/mips/kernel/irq-rm7000.c
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2003 Ralf Baechle
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ *
+ * Handler for RM7000 extended interrupts.  These are a non-standard
+ * feature so we handle them separately from standard interrupts.
+ */
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+
+#include <asm/irq_cpu.h>
+#include <asm/mipsregs.h>
+#include <asm/system.h>
+
+static int irq_base;
+
+static inline void unmask_rm7k_irq(unsigned int irq)
+{
+        set_c0_intcontrol(0x100 << (irq - irq_base));
+}
+
+static inline void mask_rm7k_irq(unsigned int irq)
+{
+        clear_c0_intcontrol(0x100 << (irq - irq_base));
+}
+
+static inline void rm7k_cpu_irq_enable(unsigned int irq)
+{
+        unsigned long flags;
+
+        local_irq_save(flags);
+        unmask_rm7k_irq(irq);
+        local_irq_restore(flags);
+}
+
+static void rm7k_cpu_irq_disable(unsigned int irq)
+{
+        unsigned long flags;
+
+        local_irq_save(flags);
+        mask_rm7k_irq(irq);
+        local_irq_restore(flags);
+}
+
+static unsigned int rm7k_cpu_irq_startup(unsigned int irq)
+{
+        rm7k_cpu_irq_enable(irq);
+
+        return 0;
+}
+
+#define rm7k_cpu_irq_shutdown   rm7k_cpu_irq_disable
+
+/*
+ * While we ack the interrupt interrupts are disabled and thus we don't need
+ * to deal with concurrency issues.  Same for rm7k_cpu_irq_end.
+ */
+static void rm7k_cpu_irq_ack(unsigned int irq)
+{
+        mask_rm7k_irq(irq);
+}
+
+static void rm7k_cpu_irq_end(unsigned int irq)
+{
+        if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
+                unmask_rm7k_irq(irq);
+}
+
+static hw_irq_controller rm7k_irq_controller = {
+        "RM7000",
+        rm7k_cpu_irq_startup,
+        rm7k_cpu_irq_shutdown,
+        rm7k_cpu_irq_enable,
+        rm7k_cpu_irq_disable,
+        rm7k_cpu_irq_ack,
+        rm7k_cpu_irq_end,
+};
+
+void __init rm7k_cpu_irq_init(int base)
+{
+        int i;
+
+        clear_c0_intcontrol(0x00000f00);                /* Mask all */
+
+        for (i = base; i < base + 4; i++) {
+                irq_desc[i].status = IRQ_DISABLED;
+                irq_desc[i].action = NULL;
+                irq_desc[i].depth = 1;
+                irq_desc[i].handler = &rm7k_irq_controller;
+        }
+
+        irq_base = base;
+}