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, 240 insertions, 0 deletions

diff --git a/kernel/arch/arm/mach-iop13xx/irq.c b/kernel/arch/arm/mach-iop13xx/irq.c
new file mode 100644
index 000000000..bc739701c
--- /dev/null
+++ b/kernel/arch/arm/mach-iop13xx/irq.c
@@ -0,0 +1,240 @@
+/*
+ * iop13xx IRQ handling / support functions
+ * Copyright (c) 2005-2006, Intel Corporation.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ */
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/sysctl.h>
+#include <asm/uaccess.h>
+#include <asm/mach/irq.h>
+#include <asm/irq.h>
+#include <mach/hardware.h>
+#include <mach/irqs.h>
+#include <mach/msi.h>
+
+/* INTCTL0 CP6 R0 Page 4
+ */
+static u32 read_intctl_0(void)
+{
+	u32 val;
+	asm volatile("mrc p6, 0, %0, c0, c4, 0":"=r" (val));
+	return val;
+}
+static void write_intctl_0(u32 val)
+{
+	asm volatile("mcr p6, 0, %0, c0, c4, 0"::"r" (val));
+}
+
+/* INTCTL1 CP6 R1 Page 4
+ */
+static u32 read_intctl_1(void)
+{
+	u32 val;
+	asm volatile("mrc p6, 0, %0, c1, c4, 0":"=r" (val));
+	return val;
+}
+static void write_intctl_1(u32 val)
+{
+	asm volatile("mcr p6, 0, %0, c1, c4, 0"::"r" (val));
+}
+
+/* INTCTL2 CP6 R2 Page 4
+ */
+static u32 read_intctl_2(void)
+{
+	u32 val;
+	asm volatile("mrc p6, 0, %0, c2, c4, 0":"=r" (val));
+	return val;
+}
+static void write_intctl_2(u32 val)
+{
+	asm volatile("mcr p6, 0, %0, c2, c4, 0"::"r" (val));
+}
+
+/* INTCTL3 CP6 R3 Page 4
+ */
+static u32 read_intctl_3(void)
+{
+	u32 val;
+	asm volatile("mrc p6, 0, %0, c3, c4, 0":"=r" (val));
+	return val;
+}
+static void write_intctl_3(u32 val)
+{
+	asm volatile("mcr p6, 0, %0, c3, c4, 0"::"r" (val));
+}
+
+/* INTSTR0 CP6 R0 Page 5
+ */
+static void write_intstr_0(u32 val)
+{
+	asm volatile("mcr p6, 0, %0, c0, c5, 0"::"r" (val));
+}
+
+/* INTSTR1 CP6 R1 Page 5
+ */
+static void write_intstr_1(u32 val)
+{
+	asm volatile("mcr p6, 0, %0, c1, c5, 0"::"r" (val));
+}
+
+/* INTSTR2 CP6 R2 Page 5
+ */
+static void write_intstr_2(u32 val)
+{
+	asm volatile("mcr p6, 0, %0, c2, c5, 0"::"r" (val));
+}
+
+/* INTSTR3 CP6 R3 Page 5
+ */
+static void write_intstr_3(u32 val)
+{
+	asm volatile("mcr p6, 0, %0, c3, c5, 0"::"r" (val));
+}
+
+/* INTBASE CP6 R0 Page 2
+ */
+static void write_intbase(u32 val)
+{
+	asm volatile("mcr p6, 0, %0, c0, c2, 0"::"r" (val));
+}
+
+/* INTSIZE CP6 R2 Page 2
+ */
+static void write_intsize(u32 val)
+{
+	asm volatile("mcr p6, 0, %0, c2, c2, 0"::"r" (val));
+}
+
+/* 0 = Interrupt Masked and 1 = Interrupt not masked */
+static void
+iop13xx_irq_mask0 (struct irq_data *d)
+{
+	write_intctl_0(read_intctl_0() & ~(1 << (d->irq - 0)));
+}
+
+static void
+iop13xx_irq_mask1 (struct irq_data *d)
+{
+	write_intctl_1(read_intctl_1() & ~(1 << (d->irq - 32)));
+}
+
+static void
+iop13xx_irq_mask2 (struct irq_data *d)
+{
+	write_intctl_2(read_intctl_2() & ~(1 << (d->irq - 64)));
+}
+
+static void
+iop13xx_irq_mask3 (struct irq_data *d)
+{
+	write_intctl_3(read_intctl_3() & ~(1 << (d->irq - 96)));
+}
+
+static void
+iop13xx_irq_unmask0(struct irq_data *d)
+{
+	write_intctl_0(read_intctl_0() | (1 << (d->irq - 0)));
+}
+
+static void
+iop13xx_irq_unmask1(struct irq_data *d)
+{
+	write_intctl_1(read_intctl_1() | (1 << (d->irq - 32)));
+}
+
+static void
+iop13xx_irq_unmask2(struct irq_data *d)
+{
+	write_intctl_2(read_intctl_2() | (1 << (d->irq - 64)));
+}
+
+static void
+iop13xx_irq_unmask3(struct irq_data *d)
+{
+	write_intctl_3(read_intctl_3() | (1 << (d->irq - 96)));
+}
+
+static struct irq_chip iop13xx_irqchip1 = {
+	.name       = "IOP13xx-1",
+	.irq_ack    = iop13xx_irq_mask0,
+	.irq_mask   = iop13xx_irq_mask0,
+	.irq_unmask = iop13xx_irq_unmask0,
+};
+
+static struct irq_chip iop13xx_irqchip2 = {
+	.name       = "IOP13xx-2",
+	.irq_ack    = iop13xx_irq_mask1,
+	.irq_mask   = iop13xx_irq_mask1,
+	.irq_unmask = iop13xx_irq_unmask1,
+};
+
+static struct irq_chip iop13xx_irqchip3 = {
+	.name       = "IOP13xx-3",
+	.irq_ack    = iop13xx_irq_mask2,
+	.irq_mask   = iop13xx_irq_mask2,
+	.irq_unmask = iop13xx_irq_unmask2,
+};
+
+static struct irq_chip iop13xx_irqchip4 = {
+	.name       = "IOP13xx-4",
+	.irq_ack    = iop13xx_irq_mask3,
+	.irq_mask   = iop13xx_irq_mask3,
+	.irq_unmask = iop13xx_irq_unmask3,
+};
+
+extern void iop_init_cp6_handler(void);
+
+void __init iop13xx_init_irq(void)
+{
+	unsigned int i;
+
+	iop_init_cp6_handler();
+
+	/* disable all interrupts */
+	write_intctl_0(0);
+	write_intctl_1(0);
+	write_intctl_2(0);
+	write_intctl_3(0);
+
+	/* treat all as IRQ */
+	write_intstr_0(0);
+	write_intstr_1(0);
+	write_intstr_2(0);
+	write_intstr_3(0);
+
+	/* initialize the interrupt vector generator */
+	write_intbase(INTBASE);
+	write_intsize(INTSIZE_4);
+
+	for(i = 0; i <= IRQ_IOP13XX_HPI; i++) {
+		if (i < 32)
+			irq_set_chip(i, &iop13xx_irqchip1);
+		else if (i < 64)
+			irq_set_chip(i, &iop13xx_irqchip2);
+		else if (i < 96)
+			irq_set_chip(i, &iop13xx_irqchip3);
+		else
+			irq_set_chip(i, &iop13xx_irqchip4);
+
+		irq_set_handler(i, handle_level_irq);
+		set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
+	}
+
+	iop13xx_msi_init();
+}