1 files changed, 107 insertions, 0 deletions
diff --git a/arch/mips/kernel/irq-rm9000.c b/arch/mips/kernel/irq-rm9000.c
new file mode 100644
index 00000000..38874a4b
--- /dev/null
+++ b/arch/mips/kernel/irq-rm9000.c
@@ -0,0 +1,107 @@
+/*
+ * 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/irq.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include <asm/irq_cpu.h>
+#include <asm/mipsregs.h>
+#include <asm/system.h>
+
+static inline void unmask_rm9k_irq(struct irq_data *d)
+{
+	set_c0_intcontrol(0x1000 << (d->irq - RM9K_CPU_IRQ_BASE));
+}
+
+static inline void mask_rm9k_irq(struct irq_data *d)
+{
+	clear_c0_intcontrol(0x1000 << (d->irq - RM9K_CPU_IRQ_BASE));
+}
+
+static inline void rm9k_cpu_irq_enable(struct irq_data *d)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	unmask_rm9k_irq(d);
+	local_irq_restore(flags);
+}
+
+/*
+ * Performance counter interrupts are global on all processors.
+ */
+static void local_rm9k_perfcounter_irq_startup(void *args)
+{
+	rm9k_cpu_irq_enable(args);
+}
+
+static unsigned int rm9k_perfcounter_irq_startup(struct irq_data *d)
+{
+	on_each_cpu(local_rm9k_perfcounter_irq_startup, d, 1);
+
+	return 0;
+}
+
+static void local_rm9k_perfcounter_irq_shutdown(void *args)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	mask_rm9k_irq(args);
+	local_irq_restore(flags);
+}
+
+static void rm9k_perfcounter_irq_shutdown(struct irq_data *d)
+{
+	on_each_cpu(local_rm9k_perfcounter_irq_shutdown, d, 1);
+}
+
+static struct irq_chip rm9k_irq_controller = {
+	.name = "RM9000",
+	.irq_ack = mask_rm9k_irq,
+	.irq_mask = mask_rm9k_irq,
+	.irq_mask_ack = mask_rm9k_irq,
+	.irq_unmask = unmask_rm9k_irq,
+	.irq_eoi = unmask_rm9k_irq
+};
+
+static struct irq_chip rm9k_perfcounter_irq = {
+	.name = "RM9000",
+	.irq_startup = rm9k_perfcounter_irq_startup,
+	.irq_shutdown = rm9k_perfcounter_irq_shutdown,
+	.irq_ack = mask_rm9k_irq,
+	.irq_mask = mask_rm9k_irq,
+	.irq_mask_ack = mask_rm9k_irq,
+	.irq_unmask = unmask_rm9k_irq,
+};
+
+unsigned int rm9000_perfcount_irq;
+
+EXPORT_SYMBOL(rm9000_perfcount_irq);
+
+void __init rm9k_cpu_irq_init(void)
+{
+	int base = RM9K_CPU_IRQ_BASE;
+	int i;
+
+	clear_c0_intcontrol(0x0000f000);		/* Mask all */
+
+	for (i = base; i < base + 4; i++)
+		irq_set_chip_and_handler(i, &rm9k_irq_controller,
+					 handle_level_irq);
+
+	rm9000_perfcount_irq = base + 1;
+	irq_set_chip_and_handler(rm9000_perfcount_irq, &rm9k_perfcounter_irq,
+				 handle_percpu_irq);
+}