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>

6 files changed, 267 insertions, 0 deletions

diff --git a/kernel/arch/arm/mach-sti/Kconfig b/kernel/arch/arm/mach-sti/Kconfig
new file mode 100644
index 000000000..3b1ac463a
--- /dev/null
+++ b/kernel/arch/arm/mach-sti/Kconfig
@@ -0,0 +1,56 @@
+menuconfig ARCH_STI
+	bool "STMicroelectronics Consumer Electronics SOCs" if ARCH_MULTI_V7
+	select ARM_GIC
+	select ARM_GLOBAL_TIMER
+	select PINCTRL
+	select PINCTRL_ST
+	select MFD_SYSCON
+	select ARCH_HAS_RESET_CONTROLLER
+	select HAVE_ARM_SCU if SMP
+	select ARCH_REQUIRE_GPIOLIB
+	select ARM_ERRATA_754322
+	select ARM_ERRATA_764369 if SMP
+	select ARM_ERRATA_775420
+	select PL310_ERRATA_753970 if CACHE_L2X0
+	select PL310_ERRATA_769419 if CACHE_L2X0
+	select RESET_CONTROLLER
+	help
+	  Include support for STiH41x SOCs like STiH415/416 using the device tree
+	  for discovery
+	  More information at Documentation/arm/STiH41x and
+	  at Documentation/devicetree
+
+
+if ARCH_STI
+
+config SOC_STIH415
+	bool "STiH415 STMicroelectronics Consumer Electronics family"
+	default y
+	select STIH415_RESET
+	help
+	  This enables support for STMicroelectronics Digital Consumer
+	  Electronics family StiH415 parts, primarily targeted at set-top-box
+	  and other digital audio/video applications using Flattned Device
+	  Trees.
+
+config SOC_STIH416
+	bool "STiH416 STMicroelectronics Consumer Electronics family"
+	default y
+	select STIH416_RESET
+	help
+	  This enables support for STMicroelectronics Digital Consumer
+	  Electronics family StiH416 parts, primarily targeted at set-top-box
+	  and other digital audio/video applications using Flattened Device
+	  Trees.
+
+config SOC_STIH407
+	bool "STiH407 STMicroelectronics Consumer Electronics family"
+	default y
+	select STIH407_RESET
+	help
+	  This enables support for STMicroelectronics Digital Consumer
+	  Electronics family StiH407 parts, targetted at set-top-box
+	  and other digital audio/video applications using Flattened Device
+	  Trees.
+
+endif
diff --git a/kernel/arch/arm/mach-sti/Makefile b/kernel/arch/arm/mach-sti/Makefile
new file mode 100644
index 000000000..acb330916
--- /dev/null
+++ b/kernel/arch/arm/mach-sti/Makefile
@@ -0,0 +1,2 @@
+obj-$(CONFIG_SMP)		+= platsmp.o headsmp.o
+obj-$(CONFIG_ARCH_STI) 		+= board-dt.o
diff --git a/kernel/arch/arm/mach-sti/board-dt.c b/kernel/arch/arm/mach-sti/board-dt.c
new file mode 100644
index 000000000..b373acade
--- /dev/null
+++ b/kernel/arch/arm/mach-sti/board-dt.c
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2013 STMicroelectronics (R&D) Limited.
+ * Author(s): Srinivas Kandagatla <srinivas.kandagatla@st.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/irq.h>
+#include <linux/of_platform.h>
+#include <asm/hardware/cache-l2x0.h>
+#include <asm/mach/arch.h>
+
+#include "smp.h"
+
+static const char *stih41x_dt_match[] __initdata = {
+	"st,stih415",
+	"st,stih416",
+	"st,stih407",
+	"st,stih410",
+	"st,stih418",
+	NULL
+};
+
+DT_MACHINE_START(STM, "STiH415/416 SoC with Flattened Device Tree")
+	.dt_compat	= stih41x_dt_match,
+	.l2c_aux_val	= L2C_AUX_CTRL_SHARED_OVERRIDE |
+			  L310_AUX_CTRL_DATA_PREFETCH |
+			  L310_AUX_CTRL_INSTR_PREFETCH |
+			  L2C_AUX_CTRL_WAY_SIZE(4),
+	.l2c_aux_mask	= 0xc0000fff,
+	.smp		= smp_ops(sti_smp_ops),
+MACHINE_END
diff --git a/kernel/arch/arm/mach-sti/headsmp.S b/kernel/arch/arm/mach-sti/headsmp.S
new file mode 100644
index 000000000..4c09bae86
--- /dev/null
+++ b/kernel/arch/arm/mach-sti/headsmp.S
@@ -0,0 +1,42 @@
+/*
+ *  arch/arm/mach-sti/headsmp.S
+ *
+ * Copyright (C) 2013 STMicroelectronics (R&D) Limited.
+ *		http://www.st.com
+ *
+ * Cloned from linux/arch/arm/mach-vexpress/headsmp.S
+ *
+ *  Copyright (c) 2003 ARM Limited
+ *  All Rights Reserved
+ *
+ * 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/linkage.h>
+#include <linux/init.h>
+
+/*
+ * ST specific entry point for secondary CPUs.  This provides
+ * a "holding pen" into which all secondary cores are held until we're
+ * ready for them to initialise.
+ */
+ENTRY(sti_secondary_startup)
+	mrc	p15, 0, r0, c0, c0, 5
+	and	r0, r0, #15
+	adr	r4, 1f
+	ldmia	r4, {r5, r6}
+	sub	r4, r4, r5
+	add	r6, r6, r4
+pen:	ldr	r7, [r6]
+	cmp	r7, r0
+	bne	pen
+
+	/*
+	 * we've been released from the holding pen: secondary_stack
+	 * should now contain the SVC stack for this core
+	 */
+	b	secondary_startup
+
+1:	.long	.
+	.long	pen_release
diff --git a/kernel/arch/arm/mach-sti/platsmp.c b/kernel/arch/arm/mach-sti/platsmp.c
new file mode 100644
index 000000000..56d402812
--- /dev/null
+++ b/kernel/arch/arm/mach-sti/platsmp.c
@@ -0,0 +1,116 @@
+/*
+ *  arch/arm/mach-sti/platsmp.c
+ *
+ * Copyright (C) 2013 STMicroelectronics (R&D) Limited.
+ *		http://www.st.com
+ *
+ * Cloned from linux/arch/arm/mach-vexpress/platsmp.c
+ *
+ *  Copyright (C) 2002 ARM Ltd.
+ *  All Rights Reserved
+ *
+ * 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/init.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/smp.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+
+#include <asm/cacheflush.h>
+#include <asm/smp_plat.h>
+#include <asm/smp_scu.h>
+
+#include "smp.h"
+
+static void write_pen_release(int val)
+{
+	pen_release = val;
+	smp_wmb();
+	sync_cache_w(&pen_release);
+}
+
+static DEFINE_RAW_SPINLOCK(boot_lock);
+
+static void sti_secondary_init(unsigned int cpu)
+{
+	trace_hardirqs_off();
+
+	/*
+	 * let the primary processor know we're out of the
+	 * pen, then head off into the C entry point
+	 */
+	write_pen_release(-1);
+
+	/*
+	 * Synchronise with the boot thread.
+	 */
+	raw_spin_lock(&boot_lock);
+	raw_spin_unlock(&boot_lock);
+}
+
+static int sti_boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+	unsigned long timeout;
+
+	/*
+	 * set synchronisation state between this boot processor
+	 * and the secondary one
+	 */
+	raw_spin_lock(&boot_lock);
+
+	/*
+	 * The secondary processor is waiting to be released from
+	 * the holding pen - release it, then wait for it to flag
+	 * that it has been released by resetting pen_release.
+	 *
+	 * Note that "pen_release" is the hardware CPU ID, whereas
+	 * "cpu" is Linux's internal ID.
+	 */
+	write_pen_release(cpu_logical_map(cpu));
+
+	/*
+	 * Send the secondary CPU a soft interrupt, thereby causing
+	 * it to jump to the secondary entrypoint.
+	 */
+	arch_send_wakeup_ipi_mask(cpumask_of(cpu));
+
+	timeout = jiffies + (1 * HZ);
+	while (time_before(jiffies, timeout)) {
+		smp_rmb();
+		if (pen_release == -1)
+			break;
+
+		udelay(10);
+	}
+
+	/*
+	 * now the secondary core is starting up let it run its
+	 * calibrations, then wait for it to finish
+	 */
+	raw_spin_unlock(&boot_lock);
+
+	return pen_release != -1 ? -ENOSYS : 0;
+}
+
+static void __init sti_smp_prepare_cpus(unsigned int max_cpus)
+{
+	void __iomem *scu_base = NULL;
+	struct device_node *np = of_find_compatible_node(
+					NULL, NULL, "arm,cortex-a9-scu");
+	if (np) {
+		scu_base = of_iomap(np, 0);
+		scu_enable(scu_base);
+		of_node_put(np);
+	}
+}
+
+struct smp_operations __initdata sti_smp_ops = {
+	.smp_prepare_cpus	= sti_smp_prepare_cpus,
+	.smp_secondary_init	= sti_secondary_init,
+	.smp_boot_secondary	= sti_boot_secondary,
+};
diff --git a/kernel/arch/arm/mach-sti/smp.h b/kernel/arch/arm/mach-sti/smp.h
new file mode 100644
index 000000000..1871b72b1
--- /dev/null
+++ b/kernel/arch/arm/mach-sti/smp.h
@@ -0,0 +1,17 @@
+/*
+ *  arch/arm/mach-sti/smp.h
+ *
+ * Copyright (C) 2013 STMicroelectronics (R&D) Limited.
+ *		http://www.st.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.
+ */
+
+#ifndef __MACH_STI_SMP_H
+#define __MACH_STI_SMP_H
+
+extern struct smp_operations	sti_smp_ops;
+
+#endif