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, 57 insertions, 0 deletions

diff --git a/kernel/arch/arm/mach-ux500/cache-l2x0.c b/kernel/arch/arm/mach-ux500/cache-l2x0.c
new file mode 100644
index 000000000..e97ee556f
--- /dev/null
+++ b/kernel/arch/arm/mach-ux500/cache-l2x0.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2011
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#include <linux/io.h>
+#include <linux/of.h>
+
+#include <asm/hardware/cache-l2x0.h>
+
+#include "db8500-regs.h"
+#include "id.h"
+
+static int __init ux500_l2x0_unlock(void)
+{
+	int i;
+	void __iomem *l2x0_base = __io_address(U8500_L2CC_BASE);
+
+	/*
+	 * Unlock Data and Instruction Lock if locked. Ux500 U-Boot versions
+	 * apparently locks both caches before jumping to the kernel. The
+	 * l2x0 core will not touch the unlock registers if the l2x0 is
+	 * already enabled, so we do it right here instead. The PL310 has
+	 * 8 sets of registers, one per possible CPU.
+	 */
+	for (i = 0; i < 8; i++) {
+		writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_D_BASE +
+			       i * L2X0_LOCKDOWN_STRIDE);
+		writel_relaxed(0x0, l2x0_base + L2X0_LOCKDOWN_WAY_I_BASE +
+			       i * L2X0_LOCKDOWN_STRIDE);
+	}
+	return 0;
+}
+
+static void ux500_l2c310_write_sec(unsigned long val, unsigned reg)
+{
+	/*
+	 * We can't write to secure registers as we are in non-secure
+	 * mode, until we have some SMI service available.
+	 */
+}
+
+static int __init ux500_l2x0_init(void)
+{
+	/* Multiplatform guard */
+	if (!((cpu_is_u8500_family() || cpu_is_ux540_family())))
+		return -ENODEV;
+
+	/* Unlock before init */
+	ux500_l2x0_unlock();
+	outer_cache.write_sec = ux500_l2c310_write_sec;
+	l2x0_of_init(0, ~0);
+
+	return 0;
+}
+early_initcall(ux500_l2x0_init);