1 files changed, 25 insertions, 0 deletions

diff --git a/arch/arc/plat-arcfpga/irq.c b/arch/arc/plat-arcfpga/irq.c
new file mode 100644
index 000000000000..d2215fd889c2
--- /dev/null
+++ b/arch/arc/plat-arcfpga/irq.c
@@ -0,0 +1,25 @@
+/*
+ * ARC FPGA Platform IRQ hookups
+ *
+ * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/interrupt.h>
+#include <plat/irq.h>
+
+void __init plat_fpga_init_IRQ(void)
+{
+        /*
+         * SMP Hack because UART IRQ hardwired to cpu0 (boot-cpu) but if the
+         * request_irq() comes from any other CPU, the low level IRQ unamsking
+         * essential for getting Interrupts won't be enabled on cpu0, locking
+         * up the UART state machine.
+         */
+#ifdef CONFIG_SMP
+        arch_unmask_irq(UART0_IRQ);
+#endif
+}