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, 57 insertions, 0 deletions

diff --git a/kernel/arch/arm/mach-footbridge/personal-pci.c b/kernel/arch/arm/mach-footbridge/personal-pci.c
new file mode 100644
index 000000000..5c9ee5461
--- /dev/null
+++ b/kernel/arch/arm/mach-footbridge/personal-pci.c
@@ -0,0 +1,57 @@
+/*
+ * linux/arch/arm/mach-footbridge/personal-pci.c
+ *
+ * PCI bios-type initialisation for PCI machines
+ *
+ * Bits taken from various places.
+ */
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+
+#include <asm/irq.h>
+#include <asm/mach/pci.h>
+#include <asm/mach-types.h>
+
+static int irqmap_personal_server[] __initdata = {
+	IRQ_IN0, IRQ_IN1, IRQ_IN2, IRQ_IN3, 0, 0, 0,
+	IRQ_DOORBELLHOST, IRQ_DMA1, IRQ_DMA2, IRQ_PCI
+};
+
+static int __init personal_server_map_irq(const struct pci_dev *dev, u8 slot,
+	u8 pin)
+{
+	unsigned char line;
+
+	pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &line);
+
+	if (line > 0x40 && line <= 0x5f) {
+		/* line corresponds to the bit controlling this interrupt
+		 * in the footbridge.  Ignore the first 8 interrupt bits,
+		 * look up the rest in the map.  IN0 is bit number 8
+		 */
+		return irqmap_personal_server[(line & 0x1f) - 8];
+	} else if (line == 0) {
+		/* no interrupt */
+		return 0;
+	} else
+		return irqmap_personal_server[(line - 1) & 3];
+}
+
+static struct hw_pci personal_server_pci __initdata = {
+	.map_irq		= personal_server_map_irq,
+	.nr_controllers		= 1,
+	.ops			= &dc21285_ops,
+	.setup			= dc21285_setup,
+	.preinit		= dc21285_preinit,
+	.postinit		= dc21285_postinit,
+};
+
+static int __init personal_pci_init(void)
+{
+	if (machine_is_personal_server())
+		pci_common_init(&personal_server_pci);
+	return 0;
+}
+
+subsys_initcall(personal_pci_init);