drivers/usb : Define usb control register mask for w1c bits

Define and use CONTROL_REGISTER_W1C_MASK to make sure that
w1c bits of usb control register do not get reset while
writing any other bit

Signed-off-by: Nikhil Badola <nikhil.badola@freescale.com>
Signed-off-by: Ramneek Mehresh <ramneek.mehresh@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index 6cb4d98..45062e6 100644
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -104,15 +104,20 @@
 
 	if (!strncmp(phy_type, "utmi", 4)) {
 #if defined(CONFIG_SYS_FSL_USB_INTERNAL_UTMI_PHY)
-		setbits_be32(&ehci->control, PHY_CLK_SEL_UTMI);
-		setbits_be32(&ehci->control, UTMI_PHY_EN);
+		clrsetbits_be32(&ehci->control, CONTROL_REGISTER_W1C_MASK,
+				PHY_CLK_SEL_UTMI);
+		clrsetbits_be32(&ehci->control, CONTROL_REGISTER_W1C_MASK,
+				UTMI_PHY_EN);
 		udelay(1000); /* delay required for PHY Clk to appear */
 #endif
 		out_le32(&(*hcor)->or_portsc[0], PORT_PTS_UTMI);
-		setbits_be32(&ehci->control, USB_EN);
+		clrsetbits_be32(&ehci->control, CONTROL_REGISTER_W1C_MASK,
+				USB_EN);
 	} else {
-		setbits_be32(&ehci->control, PHY_CLK_SEL_ULPI);
-		clrsetbits_be32(&ehci->control, UTMI_PHY_EN, USB_EN);
+		clrsetbits_be32(&ehci->control, CONTROL_REGISTER_W1C_MASK,
+				PHY_CLK_SEL_ULPI);
+		clrsetbits_be32(&ehci->control, UTMI_PHY_EN |
+				CONTROL_REGISTER_W1C_MASK, USB_EN);
 		udelay(1000); /* delay required for PHY Clk to appear */
 		if (!usb_phy_clk_valid(ehci))
 			return -EINVAL;