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, 179 insertions, 0 deletions

diff --git a/kernel/drivers/video/fbdev/mb862xx/mb862xx-i2c.c b/kernel/drivers/video/fbdev/mb862xx/mb862xx-i2c.c
new file mode 100644
index 000000000..c87e17afb
--- /dev/null
+++ b/kernel/drivers/video/fbdev/mb862xx/mb862xx-i2c.c
@@ -0,0 +1,179 @@
+/*
+ * Coral-P(A)/Lime I2C adapter driver
+ *
+ * (C) 2011 DENX Software Engineering, Anatolij Gustschin <agust@denx.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/fb.h>
+#include <linux/i2c.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/export.h>
+
+#include "mb862xxfb.h"
+#include "mb862xx_reg.h"
+
+static int mb862xx_i2c_wait_event(struct i2c_adapter *adap)
+{
+	struct mb862xxfb_par *par = adap->algo_data;
+	u32 reg;
+
+	do {
+		udelay(10);
+		reg = inreg(i2c, GC_I2C_BCR);
+		if (reg & (I2C_INT | I2C_BER))
+			break;
+	} while (1);
+
+	return (reg & I2C_BER) ? 0 : 1;
+}
+
+static int mb862xx_i2c_do_address(struct i2c_adapter *adap, int addr)
+{
+	struct mb862xxfb_par *par = adap->algo_data;
+
+	outreg(i2c, GC_I2C_DAR, addr);
+	outreg(i2c, GC_I2C_CCR, I2C_CLOCK_AND_ENABLE);
+	outreg(i2c, GC_I2C_BCR, par->i2c_rs ? I2C_REPEATED_START : I2C_START);
+	if (!mb862xx_i2c_wait_event(adap))
+		return -EIO;
+	par->i2c_rs = !(inreg(i2c, GC_I2C_BSR) & I2C_LRB);
+	return par->i2c_rs;
+}
+
+static int mb862xx_i2c_write_byte(struct i2c_adapter *adap, u8 byte)
+{
+	struct mb862xxfb_par *par = adap->algo_data;
+
+	outreg(i2c, GC_I2C_DAR, byte);
+	outreg(i2c, GC_I2C_BCR, I2C_START);
+	if (!mb862xx_i2c_wait_event(adap))
+		return -EIO;
+	return !(inreg(i2c, GC_I2C_BSR) & I2C_LRB);
+}
+
+static int mb862xx_i2c_read_byte(struct i2c_adapter *adap, u8 *byte, int last)
+{
+	struct mb862xxfb_par *par = adap->algo_data;
+
+	outreg(i2c, GC_I2C_BCR, I2C_START | (last ? 0 : I2C_ACK));
+	if (!mb862xx_i2c_wait_event(adap))
+		return 0;
+	*byte = inreg(i2c, GC_I2C_DAR);
+	return 1;
+}
+
+static void mb862xx_i2c_stop(struct i2c_adapter *adap)
+{
+	struct mb862xxfb_par *par = adap->algo_data;
+
+	outreg(i2c, GC_I2C_BCR, I2C_STOP);
+	outreg(i2c, GC_I2C_CCR, I2C_DISABLE);
+	par->i2c_rs = 0;
+}
+
+static int mb862xx_i2c_read(struct i2c_adapter *adap, struct i2c_msg *m)
+{
+	int i, ret = 0;
+	int last = m->len - 1;
+
+	for (i = 0; i < m->len; i++) {
+		if (!mb862xx_i2c_read_byte(adap, &m->buf[i], i == last)) {
+			ret = -EIO;
+			break;
+		}
+	}
+	return ret;
+}
+
+static int mb862xx_i2c_write(struct i2c_adapter *adap, struct i2c_msg *m)
+{
+	int i, ret = 0;
+
+	for (i = 0; i < m->len; i++) {
+		if (!mb862xx_i2c_write_byte(adap, m->buf[i])) {
+			ret = -EIO;
+			break;
+		}
+	}
+	return ret;
+}
+
+static int mb862xx_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
+			int num)
+{
+	struct mb862xxfb_par *par = adap->algo_data;
+	struct i2c_msg *m;
+	int addr;
+	int i = 0, err = 0;
+
+	dev_dbg(par->dev, "%s: %d msgs\n", __func__, num);
+
+	for (i = 0; i < num; i++) {
+		m = &msgs[i];
+		if (!m->len) {
+			dev_dbg(par->dev, "%s: null msgs\n", __func__);
+			continue;
+		}
+		addr = m->addr;
+		if (m->flags & I2C_M_RD)
+			addr |= 1;
+
+		err = mb862xx_i2c_do_address(adap, addr);
+		if (err < 0)
+			break;
+		if (m->flags & I2C_M_RD)
+			err = mb862xx_i2c_read(adap, m);
+		else
+			err = mb862xx_i2c_write(adap, m);
+	}
+
+	if (i)
+		mb862xx_i2c_stop(adap);
+
+	return (err < 0) ? err : i;
+}
+
+static u32 mb862xx_func(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_SMBUS_BYTE_DATA;
+}
+
+static const struct i2c_algorithm mb862xx_algo = {
+	.master_xfer	= mb862xx_xfer,
+	.functionality	= mb862xx_func,
+};
+
+static struct i2c_adapter mb862xx_i2c_adapter = {
+	.name		= "MB862xx I2C adapter",
+	.algo		= &mb862xx_algo,
+	.owner		= THIS_MODULE,
+};
+
+int mb862xx_i2c_init(struct mb862xxfb_par *par)
+{
+	int ret;
+
+	mb862xx_i2c_adapter.algo_data = par;
+	par->adap = &mb862xx_i2c_adapter;
+
+	ret = i2c_add_adapter(par->adap);
+	if (ret < 0) {
+		dev_err(par->dev, "failed to add %s\n",
+			mb862xx_i2c_adapter.name);
+	}
+	return ret;
+}
+
+void mb862xx_i2c_exit(struct mb862xxfb_par *par)
+{
+	if (par->adap) {
+		i2c_del_adapter(par->adap);
+		par->adap = NULL;
+	}
+}