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, 142 insertions, 0 deletions

diff --git a/kernel/arch/arm/mach-footbridge/dc21285-timer.c b/kernel/arch/arm/mach-footbridge/dc21285-timer.c
new file mode 100644
index 000000000..bf7aa7d29
--- /dev/null
+++ b/kernel/arch/arm/mach-footbridge/dc21285-timer.c
@@ -0,0 +1,142 @@
+/*
+ *  linux/arch/arm/mach-footbridge/dc21285-timer.c
+ *
+ *  Copyright (C) 1998 Russell King.
+ *  Copyright (C) 1998 Phil Blundell
+ */
+#include <linux/clockchips.h>
+#include <linux/clocksource.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/sched_clock.h>
+
+#include <asm/irq.h>
+
+#include <asm/hardware/dec21285.h>
+#include <asm/mach/time.h>
+#include <asm/system_info.h>
+
+#include "common.h"
+
+static cycle_t cksrc_dc21285_read(struct clocksource *cs)
+{
+	return cs->mask - *CSR_TIMER2_VALUE;
+}
+
+static int cksrc_dc21285_enable(struct clocksource *cs)
+{
+	*CSR_TIMER2_LOAD = cs->mask;
+	*CSR_TIMER2_CLR = 0;
+	*CSR_TIMER2_CNTL = TIMER_CNTL_ENABLE | TIMER_CNTL_DIV16;
+	return 0;
+}
+
+static void cksrc_dc21285_disable(struct clocksource *cs)
+{
+	*CSR_TIMER2_CNTL = 0;
+}
+
+static struct clocksource cksrc_dc21285 = {
+	.name		= "dc21285_timer2",
+	.rating		= 200,
+	.read		= cksrc_dc21285_read,
+	.enable		= cksrc_dc21285_enable,
+	.disable	= cksrc_dc21285_disable,
+	.mask		= CLOCKSOURCE_MASK(24),
+	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static int ckevt_dc21285_set_next_event(unsigned long delta,
+	struct clock_event_device *c)
+{
+	*CSR_TIMER1_CLR = 0;
+	*CSR_TIMER1_LOAD = delta;
+	*CSR_TIMER1_CNTL = TIMER_CNTL_ENABLE | TIMER_CNTL_DIV16;
+
+	return 0;
+}
+
+static void ckevt_dc21285_set_mode(enum clock_event_mode mode,
+	struct clock_event_device *c)
+{
+	switch (mode) {
+	case CLOCK_EVT_MODE_RESUME:
+	case CLOCK_EVT_MODE_PERIODIC:
+		*CSR_TIMER1_CLR = 0;
+		*CSR_TIMER1_LOAD = (mem_fclk_21285 + 8 * HZ) / (16 * HZ);
+		*CSR_TIMER1_CNTL = TIMER_CNTL_ENABLE | TIMER_CNTL_AUTORELOAD |
+				   TIMER_CNTL_DIV16;
+		break;
+
+	case CLOCK_EVT_MODE_ONESHOT:
+	case CLOCK_EVT_MODE_UNUSED:
+	case CLOCK_EVT_MODE_SHUTDOWN:
+		*CSR_TIMER1_CNTL = 0;
+		break;
+	}
+}
+
+static struct clock_event_device ckevt_dc21285 = {
+	.name		= "dc21285_timer1",
+	.features	= CLOCK_EVT_FEAT_PERIODIC |
+			  CLOCK_EVT_FEAT_ONESHOT,
+	.rating		= 200,
+	.irq		= IRQ_TIMER1,
+	.set_next_event	= ckevt_dc21285_set_next_event,
+	.set_mode	= ckevt_dc21285_set_mode,
+};
+
+static irqreturn_t timer1_interrupt(int irq, void *dev_id)
+{
+	struct clock_event_device *ce = dev_id;
+
+	*CSR_TIMER1_CLR = 0;
+
+	/* Stop the timer if in one-shot mode */
+	if (ce->mode == CLOCK_EVT_MODE_ONESHOT)
+		*CSR_TIMER1_CNTL = 0;
+
+	ce->event_handler(ce);
+
+	return IRQ_HANDLED;
+}
+
+static struct irqaction footbridge_timer_irq = {
+	.name		= "dc21285_timer1",
+	.handler	= timer1_interrupt,
+	.flags		= IRQF_TIMER | IRQF_IRQPOLL,
+	.dev_id		= &ckevt_dc21285,
+};
+
+/*
+ * Set up timer interrupt.
+ */
+void __init footbridge_timer_init(void)
+{
+	struct clock_event_device *ce = &ckevt_dc21285;
+	unsigned rate = DIV_ROUND_CLOSEST(mem_fclk_21285, 16);
+
+	clocksource_register_hz(&cksrc_dc21285, rate);
+
+	setup_irq(ce->irq, &footbridge_timer_irq);
+
+	ce->cpumask = cpumask_of(smp_processor_id());
+	clockevents_config_and_register(ce, rate, 0x4, 0xffffff);
+}
+
+static u64 notrace footbridge_read_sched_clock(void)
+{
+	return ~*CSR_TIMER3_VALUE;
+}
+
+void __init footbridge_sched_clock(void)
+{
+	unsigned rate = DIV_ROUND_CLOSEST(mem_fclk_21285, 16);
+
+	*CSR_TIMER3_LOAD = 0;
+	*CSR_TIMER3_CLR = 0;
+	*CSR_TIMER3_CNTL = TIMER_CNTL_ENABLE | TIMER_CNTL_DIV16;
+
+	sched_clock_register(footbridge_read_sched_clock, 24, rate);
+}