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, 119 insertions, 0 deletions

diff --git a/kernel/arch/arm/mach-keystone/keystone.c b/kernel/arch/arm/mach-keystone/keystone.c
new file mode 100644
index 000000000..066208758
--- /dev/null
+++ b/kernel/arch/arm/mach-keystone/keystone.c
@@ -0,0 +1,119 @@
+/*
+ * Keystone2 based boards and SOC related code.
+ *
+ * Copyright 2013 Texas Instruments, Inc.
+ *	Cyril Chemparathy <cyril@ti.com>
+ *	Santosh Shilimkar <santosh.shillimkar@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/init.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/memblock.h>
+
+#include <asm/setup.h>
+#include <asm/mach/map.h>
+#include <asm/mach/arch.h>
+#include <asm/mach/time.h>
+#include <asm/smp_plat.h>
+#include <asm/memory.h>
+
+#include "memory.h"
+
+#include "keystone.h"
+
+static struct notifier_block platform_nb;
+static unsigned long keystone_dma_pfn_offset __read_mostly;
+
+static int keystone_platform_notifier(struct notifier_block *nb,
+				      unsigned long event, void *data)
+{
+	struct device *dev = data;
+
+	if (event != BUS_NOTIFY_ADD_DEVICE)
+		return NOTIFY_DONE;
+
+	if (!dev)
+		return NOTIFY_BAD;
+
+	if (!dev->of_node) {
+		dev->dma_pfn_offset = keystone_dma_pfn_offset;
+		dev_err(dev, "set dma_pfn_offset%08lx\n",
+			dev->dma_pfn_offset);
+	}
+	return NOTIFY_OK;
+}
+
+static void __init keystone_init(void)
+{
+	keystone_pm_runtime_init();
+	if (platform_nb.notifier_call)
+		bus_register_notifier(&platform_bus_type, &platform_nb);
+	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+}
+
+static phys_addr_t keystone_virt_to_idmap(unsigned long x)
+{
+	return (phys_addr_t)(x) - CONFIG_PAGE_OFFSET + KEYSTONE_LOW_PHYS_START;
+}
+
+static void __init keystone_init_meminfo(void)
+{
+	bool lpae = IS_ENABLED(CONFIG_ARM_LPAE);
+	bool pvpatch = IS_ENABLED(CONFIG_ARM_PATCH_PHYS_VIRT);
+	phys_addr_t offset = PHYS_OFFSET - KEYSTONE_LOW_PHYS_START;
+	phys_addr_t mem_start, mem_end;
+
+	mem_start = memblock_start_of_DRAM();
+	mem_end = memblock_end_of_DRAM();
+
+	/* nothing to do if we are running out of the <32-bit space */
+	if (mem_start >= KEYSTONE_LOW_PHYS_START &&
+	    mem_end   <= KEYSTONE_LOW_PHYS_END)
+		return;
+
+	if (!lpae || !pvpatch) {
+		pr_crit("Enable %s%s%s to run outside 32-bit space\n",
+		      !lpae ? __stringify(CONFIG_ARM_LPAE) : "",
+		      (!lpae && !pvpatch) ? " and " : "",
+		      !pvpatch ? __stringify(CONFIG_ARM_PATCH_PHYS_VIRT) : "");
+	}
+
+	if (mem_start < KEYSTONE_HIGH_PHYS_START ||
+	    mem_end   > KEYSTONE_HIGH_PHYS_END) {
+		pr_crit("Invalid address space for memory (%08llx-%08llx)\n",
+		      (u64)mem_start, (u64)mem_end);
+	}
+
+	offset += KEYSTONE_HIGH_PHYS_START;
+	__pv_phys_pfn_offset = PFN_DOWN(offset);
+	__pv_offset = (offset - PAGE_OFFSET);
+
+	/* Populate the arch idmap hook */
+	arch_virt_to_idmap = keystone_virt_to_idmap;
+	platform_nb.notifier_call = keystone_platform_notifier;
+	keystone_dma_pfn_offset = PFN_DOWN(KEYSTONE_HIGH_PHYS_START -
+						KEYSTONE_LOW_PHYS_START);
+
+	pr_info("Switching to high address space at 0x%llx\n", (u64)offset);
+}
+
+static const char *const keystone_match[] __initconst = {
+	"ti,keystone",
+	NULL,
+};
+
+DT_MACHINE_START(KEYSTONE, "Keystone")
+#if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
+	.dma_zone_size	= SZ_2G,
+#endif
+	.smp		= smp_ops(keystone_smp_ops),
+	.init_machine	= keystone_init,
+	.dt_compat	= keystone_match,
+	.init_meminfo   = keystone_init_meminfo,
+MACHINE_END