libpayload: Implement usb_exit

So far it was empty and never published. It now exists and shuts down
all controllers (esp. EHCI which resets the port routers).

Change-Id: I81e355e8a05778d6397675417b085a094a6f48ee
Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Reviewed-on: http://review.coreboot.org/397
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/payloads/libpayload/drivers/usb/usb.c b/payloads/libpayload/drivers/usb/usb.c
index 4f423327d5..995b4c2918 100644
--- a/payloads/libpayload/drivers/usb/usb.c
+++ b/payloads/libpayload/drivers/usb/usb.c
@@ -68,6 +68,22 @@ detach_controller (hci_t *controller)
 }
 
 /**
+ * Shut down all controllers
+ */
+int
+usb_exit (void)
+{
+	if (usb_hcs == 0)
+		return 0;
+	hci_t *controller = usb_hcs;
+	while (controller != 0) {
+		controller->shutdown(controller);
+		controller = controller->next;
+	}
+	return 0;
+}
+
+/**
  * Polls all hubs on all USB controllers, to find out about device changes
  */
 void