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, 178 insertions, 0 deletions

diff --git a/kernel/arch/mips/lantiq/clk.c b/kernel/arch/mips/lantiq/clk.c
new file mode 100644
index 000000000..3fc2e6d70
--- /dev/null
+++ b/kernel/arch/mips/lantiq/clk.c
@@ -0,0 +1,178 @@
+/*
+ *  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.
+ *
+ * Copyright (C) 2010 Thomas Langer <thomas.langer@lantiq.com>
+ * Copyright (C) 2010 John Crispin <blogic@openwrt.org>
+ */
+#include <linux/io.h>
+#include <linux/export.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/err.h>
+#include <linux/list.h>
+
+#include <asm/time.h>
+#include <asm/irq.h>
+#include <asm/div64.h>
+
+#include <lantiq_soc.h>
+
+#include "clk.h"
+#include "prom.h"
+
+/* lantiq socs have 3 static clocks */
+static struct clk cpu_clk_generic[4];
+
+void clkdev_add_static(unsigned long cpu, unsigned long fpi,
+			unsigned long io, unsigned long ppe)
+{
+	cpu_clk_generic[0].rate = cpu;
+	cpu_clk_generic[1].rate = fpi;
+	cpu_clk_generic[2].rate = io;
+	cpu_clk_generic[3].rate = ppe;
+}
+
+struct clk *clk_get_cpu(void)
+{
+	return &cpu_clk_generic[0];
+}
+
+struct clk *clk_get_fpi(void)
+{
+	return &cpu_clk_generic[1];
+}
+EXPORT_SYMBOL_GPL(clk_get_fpi);
+
+struct clk *clk_get_io(void)
+{
+	return &cpu_clk_generic[2];
+}
+
+struct clk *clk_get_ppe(void)
+{
+	return &cpu_clk_generic[3];
+}
+EXPORT_SYMBOL_GPL(clk_get_ppe);
+
+static inline int clk_good(struct clk *clk)
+{
+	return clk && !IS_ERR(clk);
+}
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+	if (unlikely(!clk_good(clk)))
+		return 0;
+
+	if (clk->rate != 0)
+		return clk->rate;
+
+	if (clk->get_rate != NULL)
+		return clk->get_rate();
+
+	return 0;
+}
+EXPORT_SYMBOL(clk_get_rate);
+
+int clk_set_rate(struct clk *clk, unsigned long rate)
+{
+	if (unlikely(!clk_good(clk)))
+		return 0;
+	if (clk->rates && *clk->rates) {
+		unsigned long *r = clk->rates;
+
+		while (*r && (*r != rate))
+			r++;
+		if (!*r) {
+			pr_err("clk %s.%s: trying to set invalid rate %ld\n",
+				clk->cl.dev_id, clk->cl.con_id, rate);
+			return -1;
+		}
+	}
+	clk->rate = rate;
+	return 0;
+}
+EXPORT_SYMBOL(clk_set_rate);
+
+int clk_enable(struct clk *clk)
+{
+	if (unlikely(!clk_good(clk)))
+		return -1;
+
+	if (clk->enable)
+		return clk->enable(clk);
+
+	return -1;
+}
+EXPORT_SYMBOL(clk_enable);
+
+void clk_disable(struct clk *clk)
+{
+	if (unlikely(!clk_good(clk)))
+		return;
+
+	if (clk->disable)
+		clk->disable(clk);
+}
+EXPORT_SYMBOL(clk_disable);
+
+int clk_activate(struct clk *clk)
+{
+	if (unlikely(!clk_good(clk)))
+		return -1;
+
+	if (clk->activate)
+		return clk->activate(clk);
+
+	return -1;
+}
+EXPORT_SYMBOL(clk_activate);
+
+void clk_deactivate(struct clk *clk)
+{
+	if (unlikely(!clk_good(clk)))
+		return;
+
+	if (clk->deactivate)
+		clk->deactivate(clk);
+}
+EXPORT_SYMBOL(clk_deactivate);
+
+struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec)
+{
+	return NULL;
+}
+
+static inline u32 get_counter_resolution(void)
+{
+	u32 res;
+
+	__asm__ __volatile__(
+		".set	push\n"
+		".set	mips32r2\n"
+		"rdhwr	%0, $3\n"
+		".set pop\n"
+		: "=&r" (res)
+		: /* no input */
+		: "memory");
+
+	return res;
+}
+
+void __init plat_time_init(void)
+{
+	struct clk *clk;
+
+	ltq_soc_init();
+
+	clk = clk_get_cpu();
+	mips_hpt_frequency = clk_get_rate(clk) / get_counter_resolution();
+	write_c0_compare(read_c0_count());
+	pr_info("CPU Clock: %ldMHz\n", clk_get_rate(clk) / 1000000);
+	clk_put(clk);
+}