dm: usb: ehci: Use a function to find the controller from struct udevice

With driver model we want to remove the controller pointer in struct udevice
and use driver model data structures instead. To prepare for this, move
access to this field to a function which can provide a different
implementation for driver model.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Marek Vasut <marex@denx.de>

drivers/usb/host/ehci-hcd.c

@@ -119,6 +119,11 @@ static struct descriptor {
 #define ehci_is_TDI()	(0)
 #endif
 
+static struct ehci_ctrl *ehci_get_ctrl(struct usb_device *udev)
+{
+	return udev->controller;
+}
+
 __weak int ehci_get_port_speed(struct ehci_ctrl *ctrl, uint32_t reg)
 {
 	return PORTSC_PSPD(reg);
@@ -315,7 +320,7 @@ ehci_submit_async(struct usb_device *dev, unsigned long pipe, void *buffer,
 	uint32_t cmd;
 	int timeout;
 	int ret = 0;
-	struct ehci_ctrl *ctrl = dev->controller;
+	struct ehci_ctrl *ctrl = ehci_get_ctrl(dev);
 
 	debug("dev=%p, pipe=%lx, buffer=%p, length=%d, req=%p\n", dev, pipe,
 	      buffer, length, req);
@@ -661,9 +666,8 @@ fail:
 	return -1;
 }
 
-int
-ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
-		 int length, struct devrequest *req)
+static int ehci_submit_root(struct usb_device *dev, unsigned long pipe,
+			    void *buffer, int length, struct devrequest *req)
 {
 	uint8_t tmpbuf[4];
 	u16 typeReq;
@@ -672,7 +676,7 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
 	uint32_t reg;
 	uint32_t *status_reg;
 	int port = le16_to_cpu(req->index) & 0xff;
-	struct ehci_ctrl *ctrl = dev->controller;
+	struct ehci_ctrl *ctrl = ehci_get_ctrl(dev);
 
 	srclen = 0;
 
@@ -1075,9 +1079,8 @@ done:
 	return 0;
 }
 
-int
-submit_bulk_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
-		int length)
+static int _ehci_submit_bulk_msg(struct usb_device *dev, unsigned long pipe,
+				 void *buffer, int length)
 {
 
 	if (usb_pipetype(pipe) != PIPE_BULK) {
@@ -1087,11 +1090,11 @@ submit_bulk_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
 	return ehci_submit_async(dev, pipe, buffer, length, NULL);
 }
 
-int
-submit_control_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
-		   int length, struct devrequest *setup)
+static int _ehci_submit_control_msg(struct usb_device *dev, unsigned long pipe,
+				    void *buffer, int length,
+				    struct devrequest *setup)
 {
-	struct ehci_ctrl *ctrl = dev->controller;
+	struct ehci_ctrl *ctrl = ehci_get_ctrl(dev);
 
 	if (usb_pipetype(pipe) != PIPE_CONTROL) {
 		debug("non-control pipe (type=%lu)", usb_pipetype(pipe));
@@ -1161,7 +1164,7 @@ struct int_queue *
 create_int_queue(struct usb_device *dev, unsigned long pipe, int queuesize,
 		 int elementsize, void *buffer, int interval)
 {
-	struct ehci_ctrl *ctrl = dev->controller;
+	struct ehci_ctrl *ctrl = ehci_get_ctrl(dev);
 	struct int_queue *result = NULL;
 	int i;
 
@@ -1353,7 +1356,7 @@ void *poll_int_queue(struct usb_device *dev, struct int_queue *queue)
 int
 destroy_int_queue(struct usb_device *dev, struct int_queue *queue)
 {
-	struct ehci_ctrl *ctrl = dev->controller;
+	struct ehci_ctrl *ctrl = ehci_get_ctrl(dev);
 	int result = -1;
 	unsigned long timeout;
 
@@ -1397,9 +1400,8 @@ out:
 	return result;
 }
 
-int
-submit_int_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
-	       int length, int interval)
+static int _ehci_submit_int_msg(struct usb_device *dev, unsigned long pipe,
+				void *buffer, int length, int interval)
 {
 	void *backbuffer;
 	struct int_queue *queue;
@@ -1434,3 +1436,21 @@ submit_int_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
 	/* everything worked out fine */
 	return result;
 }
+
+int submit_bulk_msg(struct usb_device *dev, unsigned long pipe,
+			    void *buffer, int length)
+{
+	return _ehci_submit_bulk_msg(dev, pipe, buffer, length);
+}
+
+int submit_control_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
+		   int length, struct devrequest *setup)
+{
+	return _ehci_submit_control_msg(dev, pipe, buffer, length, setup);
+}
+
+int submit_int_msg(struct usb_device *dev, unsigned long pipe,
+		   void *buffer, int length, int interval)
+{
+	return _ehci_submit_int_msg(dev, pipe, buffer, length, interval);
+}