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, 76 insertions, 0 deletions

diff --git a/kernel/arch/arm/mach-omap1/sram-init.c b/kernel/arch/arm/mach-omap1/sram-init.c
new file mode 100644
index 000000000..6431b0f86
--- /dev/null
+++ b/kernel/arch/arm/mach-omap1/sram-init.c
@@ -0,0 +1,76 @@
+/*
+ * OMAP SRAM detection and management
+ *
+ * Copyright (C) 2005 Nokia Corporation
+ * Written by Tony Lindgren <tony@atomide.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/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+
+#include <asm/fncpy.h>
+#include <asm/tlb.h>
+#include <asm/cacheflush.h>
+
+#include <asm/mach/map.h>
+
+#include "soc.h"
+#include "sram.h"
+
+#define OMAP1_SRAM_PA		0x20000000
+#define SRAM_BOOTLOADER_SZ	0x80
+
+/*
+ * The amount of SRAM depends on the core type.
+ * Note that we cannot try to test for SRAM here because writes
+ * to secure SRAM will hang the system. Also the SRAM is not
+ * yet mapped at this point.
+ */
+static void __init omap_detect_and_map_sram(void)
+{
+	unsigned long omap_sram_skip = SRAM_BOOTLOADER_SZ;
+	unsigned long omap_sram_start = OMAP1_SRAM_PA;
+	unsigned long omap_sram_size;
+
+	if (cpu_is_omap7xx())
+		omap_sram_size = 0x32000;	/* 200K */
+	else if (cpu_is_omap15xx())
+		omap_sram_size = 0x30000;	/* 192K */
+	else if (cpu_is_omap1610() || cpu_is_omap1611() ||
+			cpu_is_omap1621() || cpu_is_omap1710())
+		omap_sram_size = 0x4000;	/* 16K */
+	else {
+		pr_err("Could not detect SRAM size\n");
+		omap_sram_size = 0x4000;
+	}
+
+	omap_map_sram(omap_sram_start, omap_sram_size,
+		omap_sram_skip, 1);
+}
+
+static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl);
+
+void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl)
+{
+	BUG_ON(!_omap_sram_reprogram_clock);
+	/* On 730, bit 13 must always be 1 */
+	if (cpu_is_omap7xx())
+		ckctl |= 0x2000;
+	_omap_sram_reprogram_clock(dpllctl, ckctl);
+}
+
+int __init omap_sram_init(void)
+{
+	omap_detect_and_map_sram();
+	_omap_sram_reprogram_clock =
+			omap_sram_push(omap1_sram_reprogram_clock,
+					omap1_sram_reprogram_clock_sz);
+
+	return 0;
+}