1 files changed, 149 insertions, 0 deletions

diff --git a/arch/mips/kernel/irq-rm9000.c b/arch/mips/kernel/irq-rm9000.c
new file mode 100644
index 000000000000..bdd130296256
--- /dev/null
+++ b/arch/mips/kernel/irq-rm9000.c
@@ -0,0 +1,149 @@
+/*
+ * 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 RM9000 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 <linux/module.h>
+
+#include <asm/irq_cpu.h>
+#include <asm/mipsregs.h>
+#include <asm/system.h>
+
+static int irq_base;
+
+static inline void unmask_rm9k_irq(unsigned int irq)
+{
+        set_c0_intcontrol(0x1000 << (irq - irq_base));
+}
+
+static inline void mask_rm9k_irq(unsigned int irq)
+{
+        clear_c0_intcontrol(0x1000 << (irq - irq_base));
+}
+
+static inline void rm9k_cpu_irq_enable(unsigned int irq)
+{
+        unsigned long flags;
+
+        local_irq_save(flags);
+        unmask_rm9k_irq(irq);
+        local_irq_restore(flags);
+}
+
+static void rm9k_cpu_irq_disable(unsigned int irq)
+{
+        unsigned long flags;
+
+        local_irq_save(flags);
+        mask_rm9k_irq(irq);
+        local_irq_restore(flags);
+}
+
+static unsigned int rm9k_cpu_irq_startup(unsigned int irq)
+{
+        rm9k_cpu_irq_enable(irq);
+
+        return 0;
+}
+
+#define rm9k_cpu_irq_shutdown   rm9k_cpu_irq_disable
+
+/*
+ * Performance counter interrupts are global on all processors.
+ */
+static void local_rm9k_perfcounter_irq_startup(void *args)
+{
+        unsigned int irq = (unsigned int) args;
+
+        rm9k_cpu_irq_enable(irq);
+}
+
+static unsigned int rm9k_perfcounter_irq_startup(unsigned int irq)
+{
+        on_each_cpu(local_rm9k_perfcounter_irq_startup, (void *) irq, 0, 1);
+
+        return 0;
+}
+
+static void local_rm9k_perfcounter_irq_shutdown(void *args)
+{
+        unsigned int irq = (unsigned int) args;
+        unsigned long flags;
+
+        local_irq_save(flags);
+        mask_rm9k_irq(irq);
+        local_irq_restore(flags);
+}
+
+static void rm9k_perfcounter_irq_shutdown(unsigned int irq)
+{
+        on_each_cpu(local_rm9k_perfcounter_irq_shutdown, (void *) irq, 0, 1);
+}
+
+
+/*
+ * While we ack the interrupt interrupts are disabled and thus we don't need
+ * to deal with concurrency issues.  Same for rm9k_cpu_irq_end.
+ */
+static void rm9k_cpu_irq_ack(unsigned int irq)
+{
+        mask_rm9k_irq(irq);
+}
+
+static void rm9k_cpu_irq_end(unsigned int irq)
+{
+        if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
+                unmask_rm9k_irq(irq);
+}
+
+static hw_irq_controller rm9k_irq_controller = {
+        "RM9000",
+        rm9k_cpu_irq_startup,
+        rm9k_cpu_irq_shutdown,
+        rm9k_cpu_irq_enable,
+        rm9k_cpu_irq_disable,
+        rm9k_cpu_irq_ack,
+        rm9k_cpu_irq_end,
+};
+
+static hw_irq_controller rm9k_perfcounter_irq = {
+        "RM9000",
+        rm9k_perfcounter_irq_startup,
+        rm9k_perfcounter_irq_shutdown,
+        rm9k_cpu_irq_enable,
+        rm9k_cpu_irq_disable,
+        rm9k_cpu_irq_ack,
+        rm9k_cpu_irq_end,
+};
+
+unsigned int rm9000_perfcount_irq;
+
+EXPORT_SYMBOL(rm9000_perfcount_irq);
+
+void __init rm9k_cpu_irq_init(int base)
+{
+        int i;
+
+        clear_c0_intcontrol(0x0000f000);                /* 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 = &rm9k_irq_controller;
+        }
+
+        rm9000_perfcount_irq = base + 1;
+        irq_desc[rm9000_perfcount_irq].handler = &rm9k_perfcounter_irq;
+
+        irq_base = base;
+}