usb: ehci: add weak-aliased function for PORTSC

There is at least one non-EHCI compliant controller (i.e. Faraday EHCI)
not only leave RESERVED and CONFIGFLAG registers un-implemented
but also has their address spaces removed.

As an result, the PORTSC register of Faraday EHCI always
starts from 0x30 instead of 0x44 in standard EHCI.

So that we'll need a weak-aliased function for abstraction.

Signed-off-by: Kuo-Jung Su <dantesu@faraday-tech.com>
CC: Marek Vasut <marex@denx.de>

drivers/usb/host/ehci-hcd.c

@@ -603,6 +603,17 @@ fail:
 	return -1;
 }
 
+__weak uint32_t *ehci_get_portsc_register(struct ehci_hcor *hcor, int port)
+{
+	if (port < 0 || port >= CONFIG_SYS_USB_EHCI_MAX_ROOT_PORTS) {
+		/* Printing the message would cause a scan failure! */
+		debug("The request port(%u) is not configured\n", port);
+		return NULL;
+	}
+
+	return (uint32_t *)&hcor->or_portsc[port];
+}
+
 int
 ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
 		 int length, struct devrequest *req)
@@ -629,11 +640,9 @@ ehci_submit_root(struct usb_device *dev, unsigned long pipe, void *buffer,
 	case USB_REQ_GET_STATUS | ((USB_RT_PORT | USB_DIR_IN) << 8):
 	case USB_REQ_SET_FEATURE | ((USB_DIR_OUT | USB_RT_PORT) << 8):
 	case USB_REQ_CLEAR_FEATURE | ((USB_DIR_OUT | USB_RT_PORT) << 8):
-		if (!port || port > CONFIG_SYS_USB_EHCI_MAX_ROOT_PORTS) {
-			printf("The request port(%d) is not configured\n", port - 1);
+		status_reg = ehci_get_portsc_register(ctrl->hcor, port - 1);
+		if (!status_reg)
 			return -1;
-		}
-		status_reg = (uint32_t *)&ctrl->hcor->or_portsc[port - 1];
 		break;
 	default:
 		status_reg = NULL;