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, 125 insertions, 0 deletions

diff --git a/kernel/arch/powerpc/platforms/40x/ep405.c b/kernel/arch/powerpc/platforms/40x/ep405.c
new file mode 100644
index 000000000..ddc12a192
--- /dev/null
+++ b/kernel/arch/powerpc/platforms/40x/ep405.c
@@ -0,0 +1,125 @@
+/*
+ * Architecture- / platform-specific boot-time initialization code for
+ * IBM PowerPC 4xx based boards. Adapted from original
+ * code by Gary Thomas, Cort Dougan <cort@fsmlabs.com>, and Dan Malek
+ * <dan@net4x.com>.
+ *
+ * Copyright(c) 1999-2000 Grant Erickson <grant@lcse.umn.edu>
+ *
+ * Rewritten and ported to the merged powerpc tree:
+ * Copyright 2007 IBM Corporation
+ * Josh Boyer <jwboyer@linux.vnet.ibm.com>
+ *
+ * Adapted to EP405 by Ben. Herrenschmidt <benh@kernel.crashing.org>
+ *
+ * TODO: Wire up the PCI IRQ mux and the southbridge interrupts
+ *
+ * 2002 (c) MontaVista, Software, Inc.  This file is licensed under
+ * the terms of the GNU General Public License version 2.  This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+
+#include <linux/init.h>
+#include <linux/of_platform.h>
+
+#include <asm/machdep.h>
+#include <asm/prom.h>
+#include <asm/udbg.h>
+#include <asm/time.h>
+#include <asm/uic.h>
+#include <asm/pci-bridge.h>
+#include <asm/ppc4xx.h>
+
+static struct device_node *bcsr_node;
+static void __iomem *bcsr_regs;
+
+/* BCSR registers  */
+#define BCSR_ID			0
+#define BCSR_PCI_CTRL	       	1
+#define BCSR_FLASH_NV_POR_CTRL	2
+#define BCSR_FENET_UART_CTRL	3
+#define BCSR_PCI_IRQ		4
+#define BCSR_XIRQ_SELECT	5
+#define BCSR_XIRQ_ROUTING	6
+#define BCSR_XIRQ_STATUS	7
+#define BCSR_XIRQ_STATUS2	8
+#define BCSR_SW_STAT_LED_CTRL	9
+#define BCSR_GPIO_IRQ_PAR_CTRL	10
+/* there's more, can't be bothered typing them tho */
+
+
+static const struct of_device_id ep405_of_bus[] __initconst = {
+	{ .compatible = "ibm,plb3", },
+	{ .compatible = "ibm,opb", },
+	{ .compatible = "ibm,ebc", },
+	{},
+};
+
+static int __init ep405_device_probe(void)
+{
+	of_platform_bus_probe(NULL, ep405_of_bus, NULL);
+
+	return 0;
+}
+machine_device_initcall(ep405, ep405_device_probe);
+
+static void __init ep405_init_bcsr(void)
+{
+	const u8 *irq_routing;
+	int i;
+
+	/* Find the bloody thing & map it */
+	bcsr_node = of_find_compatible_node(NULL, NULL, "ep405-bcsr");
+	if (bcsr_node == NULL) {
+		printk(KERN_ERR "EP405 BCSR not found !\n");
+		return;
+	}
+	bcsr_regs = of_iomap(bcsr_node, 0);
+	if (bcsr_regs == NULL) {
+		printk(KERN_ERR "EP405 BCSR failed to map !\n");
+		return;
+	}
+
+	/* Get the irq-routing property and apply the routing to the CPLD */
+	irq_routing = of_get_property(bcsr_node, "irq-routing", NULL);
+	if (irq_routing == NULL)
+		return;
+	for (i = 0; i < 16; i++) {
+		u8 irq = irq_routing[i];
+		out_8(bcsr_regs + BCSR_XIRQ_SELECT, i);
+		out_8(bcsr_regs + BCSR_XIRQ_ROUTING, irq);
+	}
+	in_8(bcsr_regs + BCSR_XIRQ_SELECT);
+	mb();
+	out_8(bcsr_regs + BCSR_GPIO_IRQ_PAR_CTRL, 0xfe);
+}
+
+static void __init ep405_setup_arch(void)
+{
+	/* Find & init the BCSR CPLD */
+	ep405_init_bcsr();
+
+	pci_set_flags(PCI_REASSIGN_ALL_RSRC);
+}
+
+static int __init ep405_probe(void)
+{
+	unsigned long root = of_get_flat_dt_root();
+
+	if (!of_flat_dt_is_compatible(root, "ep405"))
+		return 0;
+
+	return 1;
+}
+
+define_machine(ep405) {
+	.name			= "EP405",
+	.probe			= ep405_probe,
+	.setup_arch		= ep405_setup_arch,
+	.progress		= udbg_progress,
+	.init_IRQ		= uic_init_tree,
+	.get_irq		= uic_get_irq,
+	.restart		= ppc4xx_reset_system,
+	.calibrate_decr		= generic_calibrate_decr,
+};