USB: Add SuperSpeed to the list of USB device speeds.

Modify the USB core to handle the new USB 3.0 speed, "SuperSpeed".  This
is 5.0 Gbps (wire speed).  There are probably more places that check for
speed that I've missed.

SuperSpeed devices have a 512 byte endpoint 0 max packet size.  This shows
up as a bMaxPacketSize0 set to 0x09 (see table 9-8 of the USB 3.0 bus
spec).

xHCI spec says that the xHC can handle intervals up to 2^15 microframes.  That
might change when real silicon becomes available.

Add FIXME note for SuperSpeed isochronous endpoints.  They can transmit up
to 16 packets in one "burst" before they wait for an acknowledgment of the
packets.  They can do up to 3 bursts per microframe (determined by the
mult value in the endpoint companion descriptor).  The xHCI driver doesn't
have support for isoc yet, so fix this later.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

5 files changed, 31 insertions, 4 deletions

diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c
index 568244c99bd..e9426acf568 100644
--- a/drivers/usb/core/config.c
+++ b/drivers/usb/core/config.c
@@ -92,6 +92,7 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
 	if (usb_endpoint_xfer_int(d)) {
 		i = 1;
 		switch (to_usb_device(ddev)->speed) {
+		case USB_SPEED_SUPER:
 		case USB_SPEED_HIGH:
 			/* Many device manufacturers are using full-speed
 			 * bInterval values in high-speed interrupt endpoint
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index c65d9560402..120bb56c4b8 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -1870,8 +1870,20 @@ int usb_add_hcd(struct usb_hcd *hcd,
 		retval = -ENOMEM;
 		goto err_allocate_root_hub;
 	}
-	rhdev->speed = (hcd->driver->flags & HCD_USB2) ? USB_SPEED_HIGH :
-			USB_SPEED_FULL;
+
+	switch (hcd->driver->flags & HCD_MASK) {
+	case HCD_USB11:
+		rhdev->speed = USB_SPEED_FULL;
+		break;
+	case HCD_USB2:
+		rhdev->speed = USB_SPEED_HIGH;
+		break;
+	case HCD_USB3:
+		rhdev->speed = USB_SPEED_SUPER;
+		break;
+	default:
+		goto err_allocate_root_hub;
+	}
 	hcd->self.root_hub = rhdev;
 
 	/* wakeup flag init defaults to "everything works" for root hubs,
diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h
index 7a47498b0aa..4f6ee60d97c 100644
--- a/drivers/usb/core/hcd.h
+++ b/drivers/usb/core/hcd.h
@@ -174,6 +174,7 @@ struct hc_driver {
 #define	HCD_USB11	0x0010		/* USB 1.1 */
 #define	HCD_USB2	0x0020		/* USB 2.0 */
 #define	HCD_USB3	0x0040		/* USB 3.0 */
+#define	HCD_MASK	0x0070
 
 	/* called to init HCD and root hub */
 	int	(*reset) (struct usb_hcd *hcd);
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index c7a1a1d4bcb..fa0208e0da6 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2471,6 +2471,7 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
 	 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
 	 */
 	switch (udev->speed) {
+	case USB_SPEED_SUPER:
 	case USB_SPEED_VARIABLE:	/* fixed at 512 */
 		udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512);
 		break;
@@ -2496,6 +2497,9 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
 	case USB_SPEED_LOW:	speed = "low";	break;
 	case USB_SPEED_FULL:	speed = "full";	break;
 	case USB_SPEED_HIGH:	speed = "high";	break;
+	case USB_SPEED_SUPER:
+				speed = "super";
+				break;
 	case USB_SPEED_VARIABLE:
 				speed = "variable";
 				type = "Wireless ";
@@ -2634,8 +2638,11 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
 	if (retval)
 		goto fail;
 
-	i = udev->descriptor.bMaxPacketSize0 == 0xff?	/* wusb device? */
-	    512 : udev->descriptor.bMaxPacketSize0;
+	if (udev->descriptor.bMaxPacketSize0 == 0xff ||
+			udev->speed == USB_SPEED_SUPER)
+		i = 512;
+	else
+		i = udev->descriptor.bMaxPacketSize0;
 	if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
 		if (udev->speed != USB_SPEED_FULL ||
 				!(i == 8 || i == 16 || i == 32 || i == 64)) {
diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c
index 3376055f36e..02eb0ef7a4c 100644
--- a/drivers/usb/core/urb.c
+++ b/drivers/usb/core/urb.c
@@ -351,6 +351,7 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
 	if (xfertype == USB_ENDPOINT_XFER_ISOC) {
 		int	n, len;
 
+		/* FIXME SuperSpeed isoc endpoints have up to 16 bursts */
 		/* "high bandwidth" mode, 1-3 packets/uframe? */
 		if (dev->speed == USB_SPEED_HIGH) {
 			int	mult = 1 + ((max >> 11) & 0x03);
@@ -426,6 +427,11 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
 			return -EINVAL;
 		/* too big? */
 		switch (dev->speed) {
+		case USB_SPEED_SUPER:	/* units are 125us */
+			/* Handle up to 2^(16-1) microframes */
+			if (urb->interval > (1 << 15))
+				return -EINVAL;
+			max = 1 << 15;
 		case USB_SPEED_HIGH:	/* units are microframes */
 			/* NOTE usb handles 2^15 */
 			if (urb->interval > (1024 * 8))