ARC: [plat-arcfpga] No need for init_irq hack

With all IRQs unmasked by default on all cores, it is no longer needed
to unmask them explicitly.
Signed-off-by: NVineet Gupta <vgupta@synopsys.com>

arch/arc/plat-arcfpga/Makefile

@@ -8,5 +8,5 @@
 
 KBUILD_CFLAGS	+= -Iarch/arc/plat-arcfpga/include
 
-obj-y := platform.o irq.o
+obj-y := platform.o
 obj-$(CONFIG_ISS_SMP_EXTN)		+= smp.o

arch/arc/plat-arcfpga/include/plat/irq.h

@@ -24,6 +24,4 @@
 #define IDU_INTERRUPT_0 16
 #endif
 
-extern void __init plat_fpga_init_IRQ(void);
-
 #endif

arch/arc/plat-arcfpga/irq.c

-/*
- * 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
-}

arch/arc/plat-arcfpga/platform.c

@@ -150,7 +150,6 @@ MACHINE_START(ANGEL4, "angel4")
 	.dt_compat	= aa4_compat,
 	.init_early	= plat_fpga_early_init,
 	.init_machine	= plat_fpga_populate_dev,
-	.init_irq	= plat_fpga_init_IRQ,
 #ifdef CONFIG_ISS_SMP_EXTN
 	.init_smp	= iss_model_init_smp,
 #endif
@@ -165,7 +164,6 @@ MACHINE_START(ML509, "ml509")
 	.dt_compat	= ml509_compat,
 	.init_early	= plat_fpga_early_init,
 	.init_machine	= plat_fpga_populate_dev,
-	.init_irq	= plat_fpga_init_IRQ,
 #ifdef CONFIG_SMP
 	.init_smp	= iss_model_init_smp,
 #endif
@@ -180,5 +178,4 @@ MACHINE_START(NSIMOSCI, "nsimosci")
 	.dt_compat	= nsimosci_compat,
 	.init_early	= NULL,
 	.init_machine	= plat_fpga_populate_dev,
-	.init_irq	= NULL,
 MACHINE_END