usb: gadget: renesas_usbhs: add bus control functions

this patch add DVSTCTR control function for HOST support
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/renesas_usbhs/common.c

@@ -146,6 +146,33 @@ int usbhs_frame_get_num(struct usbhs_priv *priv)
 	return usbhs_read(priv, FRMNUM) & FRNM_MASK;
 }
 
+/*
+ *		bus/vbus functions
+ */
+void usbhs_bus_send_sof_enable(struct usbhs_priv *priv)
+{
+	usbhs_bset(priv, DVSTCTR, (USBRST | UACT), UACT);
+}
+
+void usbhs_bus_send_reset(struct usbhs_priv *priv)
+{
+	usbhs_bset(priv, DVSTCTR, (USBRST | UACT), USBRST);
+}
+
+int usbhs_vbus_ctrl(struct usbhs_priv *priv, int enable)
+{
+	struct platform_device *pdev = usbhs_priv_to_pdev(priv);
+
+	return usbhs_platform_call(priv, set_vbus, pdev, enable);
+}
+
+static void usbhsc_bus_init(struct usbhs_priv *priv)
+{
+	usbhs_write(priv, DVSTCTR, 0);
+
+	usbhs_vbus_ctrl(priv, 0);
+}
+
 /*
  *		local functions
  */
@@ -187,7 +214,6 @@ static void usbhsc_power_ctrl(struct usbhs_priv *priv, int enable)
 
 		/* USB on */
 		usbhs_sys_clock_ctrl(priv, enable);
-		usbhsc_set_buswait(priv);
 	} else {
 		/* USB off */
 		usbhs_sys_clock_ctrl(priv, enable);
@@ -229,6 +255,10 @@ static void usbhsc_hotplug(struct usbhs_priv *priv)
 		if (usbhsc_flags_has(priv, USBHSF_RUNTIME_PWCTRL))
 			usbhsc_power_ctrl(priv, enable);
 
+		/* bus init */
+		usbhsc_set_buswait(priv);
+		usbhsc_bus_init(priv);
+
 		/* module start */
 		usbhs_mod_call(priv, start, priv);
 
@@ -238,6 +268,9 @@ static void usbhsc_hotplug(struct usbhs_priv *priv)
 		/* module stop */
 		usbhs_mod_call(priv, stop, priv);
 
+		/* bus init */
+		usbhsc_bus_init(priv);
+
 		/* power off */
 		if (usbhsc_flags_has(priv, USBHSF_RUNTIME_PWCTRL))
 			usbhsc_power_ctrl(priv, enable);

drivers/usb/renesas_usbhs/common.h

@@ -102,6 +102,8 @@ struct usbhs_priv;
 /* DVSTCTR */
 #define EXTLP	(1 << 10)	/* Controls the EXTLP pin output state */
 #define PWEN	(1 << 9)	/* Controls the PWEN pin output state */
+#define USBRST	(1 << 6)	/* Bus Reset Output */
+#define UACT	(1 << 4)	/* USB Bus Enable */
 #define RHST	(0x7)		/* Reset Handshake */
 #define  RHST_LOW_SPEED  1	/* Low-speed connection */
 #define  RHST_FULL_SPEED 2	/* Full-speed connection */
@@ -257,6 +259,13 @@ void usbhs_sys_usb_ctrl(struct usbhs_priv *priv, int enable);
 void usbhs_sys_host_ctrl(struct usbhs_priv *priv, int enable);
 void usbhs_sys_function_ctrl(struct usbhs_priv *priv, int enable);
 
+/*
+ * bus
+ */
+void usbhs_bus_send_sof_enable(struct usbhs_priv *priv);
+void usbhs_bus_send_reset(struct usbhs_priv *priv);
+int usbhs_vbus_ctrl(struct usbhs_priv *priv, int enable);
+
 /*
  * frame
  */

include/linux/usb/renesas_usbhs.h

@@ -82,6 +82,13 @@ struct renesas_usbhs_platform_callback {
 	 * get VBUS status function.
 	 */
 	int (*get_vbus)(struct platform_device *pdev);
+
+	/*
+	 * option:
+	 *
+	 * VBUS control is needed for Host
+	 */
+	int (*set_vbus)(struct platform_device *pdev, int enable);
 };
 
 /*