Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 65 insertions, 0 deletions

diff --git a/kernel/arch/arm/mach-orion5x/irq.c b/kernel/arch/arm/mach-orion5x/irq.c
new file mode 100644
index 000000000..cd4bac4d7
--- /dev/null
+++ b/kernel/arch/arm/mach-orion5x/irq.c
@@ -0,0 +1,65 @@
+/*
+ * arch/arm/mach-orion5x/irq.c
+ *
+ * Core IRQ functions for Marvell Orion System On Chip
+ *
+ * Maintainer: Tzachi Perelstein <tzachi@marvell.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+#include <linux/gpio.h>
+#include <linux/kernel.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <mach/bridge-regs.h>
+#include <plat/orion-gpio.h>
+#include <plat/irq.h>
+#include <asm/exception.h>
+#include "common.h"
+
+static int __initdata gpio0_irqs[4] = {
+	IRQ_ORION5X_GPIO_0_7,
+	IRQ_ORION5X_GPIO_8_15,
+	IRQ_ORION5X_GPIO_16_23,
+	IRQ_ORION5X_GPIO_24_31,
+};
+
+#ifdef CONFIG_MULTI_IRQ_HANDLER
+/*
+ * Compiling with both non-DT and DT support enabled, will
+ * break asm irq handler used by non-DT boards. Therefore,
+ * we provide a C-style irq handler even for non-DT boards,
+ * if MULTI_IRQ_HANDLER is set.
+ */
+
+asmlinkage void
+__exception_irq_entry orion5x_legacy_handle_irq(struct pt_regs *regs)
+{
+	u32 stat;
+
+	stat = readl_relaxed(MAIN_IRQ_CAUSE);
+	stat &= readl_relaxed(MAIN_IRQ_MASK);
+	if (stat) {
+		unsigned int hwirq = __fls(stat);
+		handle_IRQ(hwirq, regs);
+		return;
+	}
+}
+#endif
+
+void __init orion5x_init_irq(void)
+{
+	orion_irq_init(0, MAIN_IRQ_MASK);
+
+#ifdef CONFIG_MULTI_IRQ_HANDLER
+	set_handle_irq(orion5x_legacy_handle_irq);
+#endif
+
+	/*
+	 * Initialize gpiolib for GPIOs 0-31.
+	 */
+	orion_gpio_init(NULL, 0, 32, GPIO_VIRT_BASE, 0,
+			IRQ_ORION5X_GPIO_START, gpio0_irqs);
+}