mxc_i2c: create i2c_init_transfer

Initial code of i2c_read and i2c_write
is identical, move to subroutine.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Acked-by: Marek Vasut <marex@denx.de>
Acked-by: Stefano Babic <sbabic@denx.de>

drivers/i2c/mxc_i2c.c

@@ -275,19 +275,29 @@ void i2c_imx_stop(void)
 }
 
 /*
- * Write register address
+ * Send start signal, chip address and
+ * write register address
  */
-int i2c_imx_set_reg_addr(uint addr, int alen)
+static int i2c_init_transfer(struct mxc_i2c_regs *i2c_regs,
+		uchar chip, uint addr, int alen)
 {
-	struct mxc_i2c_regs *i2c_regs = (struct mxc_i2c_regs *)I2C_BASE;
-	int ret = 0;
+	int ret = i2c_imx_start();
+	if (ret)
+		goto exit;
+
+	/* write slave address */
+	ret = tx_byte(i2c_regs, chip << 1);
+	if (ret < 0)
+		goto exit;
 
 	while (alen--) {
 		ret = tx_byte(i2c_regs, (addr >> (alen * 8)) & 0xff);
 		if (ret < 0)
-			break;
+			goto exit;
 	}
-
+	return 0;
+exit:
+	i2c_imx_stop();
 	return ret;
 }
 
@@ -318,19 +328,10 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len)
 	unsigned int temp;
 	int i;
 
-	ret = i2c_imx_start();
-	if (ret)
-		return ret;
-
-	/* write slave address */
-	ret = tx_byte(i2c_regs, chip << 1);
+	ret = i2c_init_transfer(i2c_regs, chip, addr, alen);
 	if (ret < 0)
 		return ret;
 
-	ret = i2c_imx_set_reg_addr(addr, alen);
-	if (ret)
-		return ret;
-
 	temp = readb(&i2c_regs->i2cr);
 	temp |= I2CR_RSTA;
 	writeb(temp, &i2c_regs->i2cr);
@@ -387,19 +388,10 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len)
 	int ret;
 	int i;
 
-	ret = i2c_imx_start();
-	if (ret)
-		return ret;
-
-	/* write slave address */
-	ret = tx_byte(i2c_regs, chip << 1);
+	ret = i2c_init_transfer(i2c_regs, chip, addr, alen);
 	if (ret < 0)
 		return ret;
 
-	ret = i2c_imx_set_reg_addr(addr, alen);
-	if (ret)
-		return ret;
-
 	for (i = 0; i < len; i++) {
 		ret = tx_byte(i2c_regs, buf[i]);
 		if (ret < 0)