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, 44 insertions, 0 deletions

diff --git a/kernel/arch/mips/ath25/early_printk.c b/kernel/arch/mips/ath25/early_printk.c
new file mode 100644
index 000000000..36035b628
--- /dev/null
+++ b/kernel/arch/mips/ath25/early_printk.c
@@ -0,0 +1,44 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
+ */
+
+#include <linux/mm.h>
+#include <linux/io.h>
+#include <linux/serial_reg.h>
+
+#include "devices.h"
+#include "ar2315_regs.h"
+#include "ar5312_regs.h"
+
+static inline void prom_uart_wr(void __iomem *base, unsigned reg,
+				unsigned char ch)
+{
+	__raw_writel(ch, base + 4 * reg);
+}
+
+static inline unsigned char prom_uart_rr(void __iomem *base, unsigned reg)
+{
+	return __raw_readl(base + 4 * reg);
+}
+
+void prom_putchar(unsigned char ch)
+{
+	static void __iomem *base;
+
+	if (unlikely(base == NULL)) {
+		if (is_ar2315())
+			base = (void __iomem *)(KSEG1ADDR(AR2315_UART0_BASE));
+		else
+			base = (void __iomem *)(KSEG1ADDR(AR5312_UART0_BASE));
+	}
+
+	while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0)
+		;
+	prom_uart_wr(base, UART_TX, ch);
+	while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0)
+		;
+}