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, 106 insertions, 0 deletions

diff --git a/kernel/arch/mips/pmcs-msp71xx/msp_irq_slp.c b/kernel/arch/mips/pmcs-msp71xx/msp_irq_slp.c
new file mode 100644
index 000000000..5f66a7631
--- /dev/null
+++ b/kernel/arch/mips/pmcs-msp71xx/msp_irq_slp.c
@@ -0,0 +1,106 @@
+/*
+ * This file define the irq handler for MSP SLM subsystem interrupts.
+ *
+ * Copyright 2005-2006 PMC-Sierra, Inc, derived from irq_cpu.c
+ * Author: Andrew Hughes, Andrew_Hughes@pmc-sierra.com
+ *
+ * This program is free software; you can redistribute	it and/or modify it
+ * under  the terms of	the GNU General	 Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/bitops.h>
+
+#include <asm/mipsregs.h>
+
+#include <msp_slp_int.h>
+#include <msp_regs.h>
+
+static inline void unmask_msp_slp_irq(struct irq_data *d)
+{
+	unsigned int irq = d->irq;
+
+	/* check for PER interrupt range */
+	if (irq < MSP_PER_INTBASE)
+		*SLP_INT_MSK_REG |= (1 << (irq - MSP_SLP_INTBASE));
+	else
+		*PER_INT_MSK_REG |= (1 << (irq - MSP_PER_INTBASE));
+}
+
+static inline void mask_msp_slp_irq(struct irq_data *d)
+{
+	unsigned int irq = d->irq;
+
+	/* check for PER interrupt range */
+	if (irq < MSP_PER_INTBASE)
+		*SLP_INT_MSK_REG &= ~(1 << (irq - MSP_SLP_INTBASE));
+	else
+		*PER_INT_MSK_REG &= ~(1 << (irq - MSP_PER_INTBASE));
+}
+
+/*
+ * While we ack the interrupt interrupts are disabled and thus we don't need
+ * to deal with concurrency issues.  Same for msp_slp_irq_end.
+ */
+static inline void ack_msp_slp_irq(struct irq_data *d)
+{
+	unsigned int irq = d->irq;
+
+	/* check for PER interrupt range */
+	if (irq < MSP_PER_INTBASE)
+		*SLP_INT_STS_REG = (1 << (irq - MSP_SLP_INTBASE));
+	else
+		*PER_INT_STS_REG = (1 << (irq - MSP_PER_INTBASE));
+}
+
+static struct irq_chip msp_slp_irq_controller = {
+	.name = "MSP_SLP",
+	.irq_ack = ack_msp_slp_irq,
+	.irq_mask = mask_msp_slp_irq,
+	.irq_unmask = unmask_msp_slp_irq,
+};
+
+void __init msp_slp_irq_init(void)
+{
+	int i;
+
+	/* Mask/clear interrupts. */
+	*SLP_INT_MSK_REG = 0x00000000;
+	*PER_INT_MSK_REG = 0x00000000;
+	*SLP_INT_STS_REG = 0xFFFFFFFF;
+	*PER_INT_STS_REG = 0xFFFFFFFF;
+
+	/* initialize all the IRQ descriptors */
+	for (i = MSP_SLP_INTBASE; i < MSP_PER_INTBASE + 32; i++)
+		irq_set_chip_and_handler(i, &msp_slp_irq_controller,
+					 handle_level_irq);
+}
+
+void msp_slp_irq_dispatch(void)
+{
+	u32 pending;
+	int intbase;
+
+	intbase = MSP_SLP_INTBASE;
+	pending = *SLP_INT_STS_REG & *SLP_INT_MSK_REG;
+
+	/* check for PER interrupt */
+	if (pending == (1 << (MSP_INT_PER - MSP_SLP_INTBASE))) {
+		intbase = MSP_PER_INTBASE;
+		pending = *PER_INT_STS_REG & *PER_INT_MSK_REG;
+	}
+
+	/* check for spurious interrupt */
+	if (pending == 0x00000000) {
+		printk(KERN_ERR "Spurious %s interrupt?\n",
+			(intbase == MSP_SLP_INTBASE) ? "SLP" : "PER");
+		return;
+	}
+
+	/* dispatch the irq */
+	do_IRQ(ffs(pending) + intbase - 1);
+}