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, 152 insertions, 0 deletions

diff --git a/kernel/arch/powerpc/sysdev/mv64x60_udbg.c b/kernel/arch/powerpc/sysdev/mv64x60_udbg.c
new file mode 100644
index 000000000..3b8734b87
--- /dev/null
+++ b/kernel/arch/powerpc/sysdev/mv64x60_udbg.c
@@ -0,0 +1,152 @@
+/*
+ * udbg serial input/output routines for the Marvell MV64x60 (Discovery).
+ *
+ * Author: Dale Farnsworth <dale@farnsworth.org>
+ *
+ * 2007 (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 <asm/io.h>
+#include <asm/prom.h>
+#include <asm/udbg.h>
+
+#include <sysdev/mv64x60.h>
+
+#define MPSC_0_CR1_OFFSET	0x000c
+
+#define MPSC_0_CR2_OFFSET	0x0010
+#define MPSC_CHR_2_TCS		(1 << 9)
+
+#define MPSC_0_CHR_10_OFFSET	0x0030
+
+#define MPSC_INTR_CAUSE_OFF_0	0x0004
+#define MPSC_INTR_CAUSE_OFF_1	0x000c
+#define MPSC_INTR_CAUSE_RCC	(1<<6)
+
+static void __iomem *mpsc_base;
+static void __iomem *mpsc_intr_cause;
+
+static void mv64x60_udbg_putc(char c)
+{
+	if (c == '\n')
+		mv64x60_udbg_putc('\r');
+
+	while(in_le32(mpsc_base + MPSC_0_CR2_OFFSET) & MPSC_CHR_2_TCS)
+		;
+	out_le32(mpsc_base + MPSC_0_CR1_OFFSET, c);
+	out_le32(mpsc_base + MPSC_0_CR2_OFFSET, MPSC_CHR_2_TCS);
+}
+
+static int mv64x60_udbg_testc(void)
+{
+	return (in_le32(mpsc_intr_cause) & MPSC_INTR_CAUSE_RCC) != 0;
+}
+
+static int mv64x60_udbg_getc(void)
+{
+	int cause = 0;
+	int c;
+
+	while (!mv64x60_udbg_testc())
+		;
+
+	c = in_8(mpsc_base + MPSC_0_CHR_10_OFFSET + 2);
+	out_8(mpsc_base + MPSC_0_CHR_10_OFFSET + 2, c);
+	out_le32(mpsc_intr_cause, cause & ~MPSC_INTR_CAUSE_RCC);
+	return c;
+}
+
+static int mv64x60_udbg_getc_poll(void)
+{
+	if (!mv64x60_udbg_testc())
+		return -1;
+
+	return mv64x60_udbg_getc();
+}
+
+static void mv64x60_udbg_init(void)
+{
+	struct device_node *np, *mpscintr, *stdout = NULL;
+	const char *path;
+	const phandle *ph;
+	struct resource r[2];
+	const int *block_index;
+	int intr_cause_offset;
+	int err;
+
+	path = of_get_property(of_chosen, "linux,stdout-path", NULL);
+	if (!path)
+		return;
+
+	stdout = of_find_node_by_path(path);
+	if (!stdout)
+		return;
+
+	for_each_compatible_node(np, NULL, "marvell,mv64360-mpsc") {
+		if (np == stdout)
+			break;
+	}
+
+	of_node_put(stdout);
+	if (!np)
+		return;
+
+	block_index = of_get_property(np, "cell-index", NULL);
+	if (!block_index)
+		goto error;
+
+	switch (*block_index) {
+	case 0:
+		intr_cause_offset = MPSC_INTR_CAUSE_OFF_0;
+		break;
+	case 1:
+		intr_cause_offset = MPSC_INTR_CAUSE_OFF_1;
+		break;
+	default:
+		goto error;
+	}
+
+	err = of_address_to_resource(np, 0, &r[0]);
+	if (err)
+		goto error;
+
+	ph = of_get_property(np, "mpscintr", NULL);
+	mpscintr = of_find_node_by_phandle(*ph);
+	if (!mpscintr)
+		goto error;
+
+	err = of_address_to_resource(mpscintr, 0, &r[1]);
+	of_node_put(mpscintr);
+	if (err)
+		goto error;
+
+	of_node_put(np);
+
+	mpsc_base = ioremap(r[0].start, resource_size(&r[0]));
+	if (!mpsc_base)
+		return;
+
+	mpsc_intr_cause = ioremap(r[1].start, resource_size(&r[1]));
+	if (!mpsc_intr_cause) {
+		iounmap(mpsc_base);
+		return;
+	}
+	mpsc_intr_cause += intr_cause_offset;
+
+	udbg_putc = mv64x60_udbg_putc;
+	udbg_getc = mv64x60_udbg_getc;
+	udbg_getc_poll = mv64x60_udbg_getc_poll;
+
+	return;
+
+error:
+	of_node_put(np);
+}
+
+void mv64x60_init_early(void)
+{
+	mv64x60_udbg_init();
+}