usb: dwc3: gadget: refactor dwc3_gadget_init_endpoints()

This just makes it slightly easier to read. No functional changes.
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/dwc3/gadget.c

@@ -2075,113 +2075,142 @@ static const struct usb_gadget_ops dwc3_gadget_ops = {
 
 /* -------------------------------------------------------------------------- */
 
-static int dwc3_gadget_init_endpoints(struct dwc3 *dwc, u8 total)
+static int dwc3_gadget_init_control_endpoint(struct dwc3_ep *dep)
 {
-	struct dwc3_ep			*dep;
-	u8				epnum;
+	struct dwc3 *dwc = dep->dwc;
 
-	INIT_LIST_HEAD(&dwc->gadget.ep_list);
+	usb_ep_set_maxpacket_limit(&dep->endpoint, 512);
+	dep->endpoint.maxburst = 1;
+	dep->endpoint.ops = &dwc3_gadget_ep0_ops;
+	if (!dep->direction)
+		dwc->gadget.ep0 = &dep->endpoint;
 
-	for (epnum = 0; epnum < total; epnum++) {
-		bool			direction = epnum & 1;
-		u8			num = epnum >> 1;
+	dep->endpoint.caps.type_control = true;
 
-		dep = kzalloc(sizeof(*dep), GFP_KERNEL);
-		if (!dep)
-			return -ENOMEM;
+	return 0;
+}
 
-		dep->dwc = dwc;
-		dep->number = epnum;
-		dep->direction = direction;
-		dep->regs = dwc->regs + DWC3_DEP_BASE(epnum);
-		dwc->eps[epnum] = dep;
+static int dwc3_gadget_init_in_endpoint(struct dwc3_ep *dep)
+{
+	struct dwc3 *dwc = dep->dwc;
+	int mdwidth;
+	int kbytes;
+	int size;
 
-		snprintf(dep->name, sizeof(dep->name), "ep%u%s", num,
-				direction ? "in" : "out");
+	mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
+	/* MDWIDTH is represented in bits, we need it in bytes */
+	mdwidth /= 8;
 
-		dep->endpoint.name = dep->name;
+	size = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(dep->number >> 1));
+	if (dwc3_is_usb31(dwc))
+		size = DWC31_GTXFIFOSIZ_TXFDEF(size);
+	else
+		size = DWC3_GTXFIFOSIZ_TXFDEF(size);
 
-		if (!(dep->number > 1)) {
-			dep->endpoint.desc = &dwc3_gadget_ep0_desc;
-			dep->endpoint.comp_desc = NULL;
-		}
+	/* FIFO Depth is in MDWDITH bytes. Multiply */
+	size *= mdwidth;
 
-		spin_lock_init(&dep->lock);
-
-		if (num == 0) {
-			usb_ep_set_maxpacket_limit(&dep->endpoint, 512);
-			dep->endpoint.maxburst = 1;
-			dep->endpoint.ops = &dwc3_gadget_ep0_ops;
-			if (!direction)
-				dwc->gadget.ep0 = &dep->endpoint;
-		} else if (direction) {
-			int mdwidth;
-			int kbytes;
-			int size;
-			int ret;
-
-			mdwidth = DWC3_MDWIDTH(dwc->hwparams.hwparams0);
-			/* MDWIDTH is represented in bits, we need it in bytes */
-			mdwidth /= 8;
-
-			size = dwc3_readl(dwc->regs, DWC3_GTXFIFOSIZ(num));
-			if (dwc3_is_usb31(dwc))
-				size = DWC31_GTXFIFOSIZ_TXFDEF(size);
-			else
-				size = DWC3_GTXFIFOSIZ_TXFDEF(size);
+	kbytes = size / 1024;
+	if (kbytes == 0)
+		kbytes = 1;
 
-			/* FIFO Depth is in MDWDITH bytes. Multiply */
-			size *= mdwidth;
+	/*
+	 * FIFO sizes account an extra MDWIDTH * (kbytes + 1) bytes for
+	 * internal overhead. We don't really know how these are used,
+	 * but documentation say it exists.
+	 */
+	size -= mdwidth * (kbytes + 1);
+	size /= kbytes;
 
-			kbytes = size / 1024;
-			if (kbytes == 0)
-				kbytes = 1;
+	usb_ep_set_maxpacket_limit(&dep->endpoint, size);
 
-			/*
-			 * FIFO sizes account an extra MDWIDTH * (kbytes + 1) bytes for
-			 * internal overhead. We don't really know how these are used,
-			 * but documentation say it exists.
-			 */
-			size -= mdwidth * (kbytes + 1);
-			size /= kbytes;
+	dep->endpoint.max_streams = 15;
+	dep->endpoint.ops = &dwc3_gadget_ep_ops;
+	list_add_tail(&dep->endpoint.ep_list,
+			&dwc->gadget.ep_list);
+	dep->endpoint.caps.type_iso = true;
+	dep->endpoint.caps.type_bulk = true;
+	dep->endpoint.caps.type_int = true;
 
-			usb_ep_set_maxpacket_limit(&dep->endpoint, size);
+	return dwc3_alloc_trb_pool(dep);
+}
 
-			dep->endpoint.max_streams = 15;
-			dep->endpoint.ops = &dwc3_gadget_ep_ops;
-			list_add_tail(&dep->endpoint.ep_list,
-					&dwc->gadget.ep_list);
+static int dwc3_gadget_init_out_endpoint(struct dwc3_ep *dep)
+{
+	struct dwc3 *dwc = dep->dwc;
 
-			ret = dwc3_alloc_trb_pool(dep);
-			if (ret)
-				return ret;
-		} else {
-			int		ret;
+	usb_ep_set_maxpacket_limit(&dep->endpoint, 1024);
+	dep->endpoint.max_streams = 15;
+	dep->endpoint.ops = &dwc3_gadget_ep_ops;
+	list_add_tail(&dep->endpoint.ep_list,
+			&dwc->gadget.ep_list);
+	dep->endpoint.caps.type_iso = true;
+	dep->endpoint.caps.type_bulk = true;
+	dep->endpoint.caps.type_int = true;
 
-			usb_ep_set_maxpacket_limit(&dep->endpoint, 1024);
-			dep->endpoint.max_streams = 15;
-			dep->endpoint.ops = &dwc3_gadget_ep_ops;
-			list_add_tail(&dep->endpoint.ep_list,
-					&dwc->gadget.ep_list);
+	return dwc3_alloc_trb_pool(dep);
+}
 
-			ret = dwc3_alloc_trb_pool(dep);
-			if (ret)
-				return ret;
-		}
+static int dwc3_gadget_init_endpoint(struct dwc3 *dwc, u8 epnum)
+{
+	struct dwc3_ep			*dep;
+	bool				direction = epnum & 1;
+	int				ret;
+	u8				num = epnum >> 1;
 
-		if (num == 0) {
-			dep->endpoint.caps.type_control = true;
-		} else {
-			dep->endpoint.caps.type_iso = true;
-			dep->endpoint.caps.type_bulk = true;
-			dep->endpoint.caps.type_int = true;
-		}
+	dep = kzalloc(sizeof(*dep), GFP_KERNEL);
+	if (!dep)
+		return -ENOMEM;
+
+	dep->dwc = dwc;
+	dep->number = epnum;
+	dep->direction = direction;
+	dep->regs = dwc->regs + DWC3_DEP_BASE(epnum);
+	dwc->eps[epnum] = dep;
+
+	snprintf(dep->name, sizeof(dep->name), "ep%u%s", num,
+			direction ? "in" : "out");
+
+	dep->endpoint.name = dep->name;
+
+	if (!(dep->number > 1)) {
+		dep->endpoint.desc = &dwc3_gadget_ep0_desc;
+		dep->endpoint.comp_desc = NULL;
+	}
+
+	spin_lock_init(&dep->lock);
+
+	if (num == 0)
+		ret = dwc3_gadget_init_control_endpoint(dep);
+	else if (direction)
+		ret = dwc3_gadget_init_in_endpoint(dep);
+	else
+		ret = dwc3_gadget_init_out_endpoint(dep);
+
+	if (ret)
+		return ret;
 
-		dep->endpoint.caps.dir_in = direction;
-		dep->endpoint.caps.dir_out = !direction;
+	dep->endpoint.caps.dir_in = direction;
+	dep->endpoint.caps.dir_out = !direction;
 
-		INIT_LIST_HEAD(&dep->pending_list);
-		INIT_LIST_HEAD(&dep->started_list);
+	INIT_LIST_HEAD(&dep->pending_list);
+	INIT_LIST_HEAD(&dep->started_list);
+
+	return 0;
+}
+
+static int dwc3_gadget_init_endpoints(struct dwc3 *dwc, u8 total)
+{
+	u8				epnum;
+
+	INIT_LIST_HEAD(&dwc->gadget.ep_list);
+
+	for (epnum = 0; epnum < total; epnum++) {
+		int			ret;
+
+		ret = dwc3_gadget_init_endpoint(dwc, epnum);
+		if (ret)
+			return ret;
 	}
 
 	return 0;