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, 105 insertions, 0 deletions

diff --git a/kernel/arch/arm/mach-mmp/clock.c b/kernel/arch/arm/mach-mmp/clock.c
new file mode 100644
index 000000000..7c6f95f29
--- /dev/null
+++ b/kernel/arch/arm/mach-mmp/clock.c
@@ -0,0 +1,105 @@
+/*
+ *  linux/arch/arm/mach-mmp/clock.c
+ *
+ *  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/module.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#include <mach/regs-apbc.h>
+#include "clock.h"
+
+static void apbc_clk_enable(struct clk *clk)
+{
+	uint32_t clk_rst;
+
+	clk_rst = APBC_APBCLK | APBC_FNCLK | APBC_FNCLKSEL(clk->fnclksel);
+	__raw_writel(clk_rst, clk->clk_rst);
+}
+
+static void apbc_clk_disable(struct clk *clk)
+{
+	__raw_writel(0, clk->clk_rst);
+}
+
+struct clkops apbc_clk_ops = {
+	.enable		= apbc_clk_enable,
+	.disable	= apbc_clk_disable,
+};
+
+static void apmu_clk_enable(struct clk *clk)
+{
+	__raw_writel(clk->enable_val, clk->clk_rst);
+}
+
+static void apmu_clk_disable(struct clk *clk)
+{
+	__raw_writel(0, clk->clk_rst);
+}
+
+struct clkops apmu_clk_ops = {
+	.enable		= apmu_clk_enable,
+	.disable	= apmu_clk_disable,
+};
+
+static DEFINE_SPINLOCK(clocks_lock);
+
+int clk_enable(struct clk *clk)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&clocks_lock, flags);
+	if (clk->enabled++ == 0)
+		clk->ops->enable(clk);
+	spin_unlock_irqrestore(&clocks_lock, flags);
+	return 0;
+}
+EXPORT_SYMBOL(clk_enable);
+
+void clk_disable(struct clk *clk)
+{
+	unsigned long flags;
+
+	WARN_ON(clk->enabled == 0);
+
+	spin_lock_irqsave(&clocks_lock, flags);
+	if (--clk->enabled == 0)
+		clk->ops->disable(clk);
+	spin_unlock_irqrestore(&clocks_lock, flags);
+}
+EXPORT_SYMBOL(clk_disable);
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+	unsigned long rate;
+
+	if (clk->ops->getrate)
+		rate = clk->ops->getrate(clk);
+	else
+		rate = clk->rate;
+
+	return rate;
+}
+EXPORT_SYMBOL(clk_get_rate);
+
+int clk_set_rate(struct clk *clk, unsigned long rate)
+{
+	unsigned long flags;
+	int ret = -EINVAL;
+
+	if (clk->ops->setrate) {
+		spin_lock_irqsave(&clocks_lock, flags);
+		ret = clk->ops->setrate(clk, rate);
+		spin_unlock_irqrestore(&clocks_lock, flags);
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL(clk_set_rate);