USB: Add USB 3.0 roothub support to USB core.

Add USB 3.0 root hub descriptors.  This is a kludge because I reused the old
USB 2.0 descriptors, instead of using the new USB 3.0 hub descriptors with
endpoint companion descriptors and other descriptors.  I did this because I
wasn't ready to add USB 3.0 hub changes to khubd.  For now, a USB 3.0 roothub
looks like a USB 2.0 roothub, with a higher speed.

USB 3.0 hubs have no transaction translator (TT).

Make USB core debugging handle super speed ports.

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

3 files changed, 77 insertions, 2 deletions

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 120bb56c4b8..823744d80cb 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -128,6 +128,27 @@ static inline int is_root_hub(struct usb_device *udev)
 #define KERNEL_REL      ((LINUX_VERSION_CODE >> 16) & 0x0ff)
 #define KERNEL_VER      ((LINUX_VERSION_CODE >> 8) & 0x0ff)
 
+/* usb 3.0 root hub device descriptor */
+static const u8 usb3_rh_dev_descriptor[18] = {
+        0x12,       /*  __u8  bLength; */
+        0x01,       /*  __u8  bDescriptorType; Device */
+        0x00, 0x03, /*  __le16 bcdUSB; v3.0 */
+
+        0x09,       /*  __u8  bDeviceClass; HUB_CLASSCODE */
+        0x00,       /*  __u8  bDeviceSubClass; */
+        0x03,       /*  __u8  bDeviceProtocol; USB 3.0 hub */
+        0x09,       /*  __u8  bMaxPacketSize0; 2^9 = 512 Bytes */
+
+        0x6b, 0x1d, /*  __le16 idVendor; Linux Foundation */
+        0x02, 0x00, /*  __le16 idProduct; device 0x0002 */
+        KERNEL_VER, KERNEL_REL, /*  __le16 bcdDevice */
+
+        0x03,       /*  __u8  iManufacturer; */
+        0x02,       /*  __u8  iProduct; */
+        0x01,       /*  __u8  iSerialNumber; */
+        0x01        /*  __u8  bNumConfigurations; */
+};
+
 /* usb 2.0 root hub device descriptor */
 static const u8 usb2_rh_dev_descriptor [18] = {
         0x12,       /*  __u8  bLength; */
@@ -273,6 +294,47 @@ static const u8 hs_rh_config_descriptor [] = {
         0x0c        /*  __u8  ep_bInterval; (256ms -- usb 2.0 spec) */
 };
 
+static const u8 ss_rh_config_descriptor[] = {
+        /* one configuration */
+        0x09,       /*  __u8  bLength; */
+        0x02,       /*  __u8  bDescriptorType; Configuration */
+        0x19, 0x00, /*  __le16 wTotalLength; FIXME */
+        0x01,       /*  __u8  bNumInterfaces; (1) */
+        0x01,       /*  __u8  bConfigurationValue; */
+        0x00,       /*  __u8  iConfiguration; */
+        0xc0,       /*  __u8  bmAttributes;
+                                 Bit 7: must be set,
+                                     6: Self-powered,
+                                     5: Remote wakeup,
+                                     4..0: resvd */
+        0x00,       /*  __u8  MaxPower; */
+
+        /* one interface */
+        0x09,       /*  __u8  if_bLength; */
+        0x04,       /*  __u8  if_bDescriptorType; Interface */
+        0x00,       /*  __u8  if_bInterfaceNumber; */
+        0x00,       /*  __u8  if_bAlternateSetting; */
+        0x01,       /*  __u8  if_bNumEndpoints; */
+        0x09,       /*  __u8  if_bInterfaceClass; HUB_CLASSCODE */
+        0x00,       /*  __u8  if_bInterfaceSubClass; */
+        0x00,       /*  __u8  if_bInterfaceProtocol; */
+        0x00,       /*  __u8  if_iInterface; */
+
+        /* one endpoint (status change endpoint) */
+        0x07,       /*  __u8  ep_bLength; */
+        0x05,       /*  __u8  ep_bDescriptorType; Endpoint */
+        0x81,       /*  __u8  ep_bEndpointAddress; IN Endpoint 1 */
+        0x03,       /*  __u8  ep_bmAttributes; Interrupt */
+                    /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8)
+                     * see hub.c:hub_configure() for details. */
+        (USB_MAXCHILDREN + 1 + 7) / 8, 0x00,
+        0x0c        /*  __u8  ep_bInterval; (256ms -- usb 2.0 spec) */
+        /*
+         * All 3.0 hubs should have an endpoint companion descriptor,
+         * but we're ignoring that for now.  FIXME?
+         */
+};
+
 /*-------------------------------------------------------------------------*/
 
 /*
@@ -426,7 +488,9 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
         case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
                 switch (wValue & 0xff00) {
                 case USB_DT_DEVICE << 8:
-                        if (hcd->driver->flags & HCD_USB2)
+                        if (hcd->driver->flags & HCD_USB3)
+                                bufp = usb3_rh_dev_descriptor;
+                        else if (hcd->driver->flags & HCD_USB2)
                                 bufp = usb2_rh_dev_descriptor;
                         else if (hcd->driver->flags & HCD_USB11)
                                 bufp = usb11_rh_dev_descriptor;
@@ -437,7 +501,10 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
                                 patch_protocol = 1;
                         break;
                 case USB_DT_CONFIG << 8:
-                        if (hcd->driver->flags & HCD_USB2) {
+                        if (hcd->driver->flags & HCD_USB3) {
+                                bufp = ss_rh_config_descriptor;
+                                len = sizeof ss_rh_config_descriptor;
+                        } else if (hcd->driver->flags & HCD_USB2) {
                                 bufp = hs_rh_config_descriptor;
                                 len = sizeof hs_rh_config_descriptor;
                         } else {
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index fa0208e0da6..f3fe8dfaaad 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -155,6 +155,8 @@ static inline char *portspeed(int portstatus)
                 return "480 Mb/s";
         else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
                 return "1.5 Mb/s";
+        else if (portstatus & (1 << USB_PORT_FEAT_SUPERSPEED))
+                return "5.0 Gb/s";
         else
                 return "12 Mb/s";
 }
@@ -951,6 +953,9 @@ static int hub_configure(struct usb_hub *hub,
                                         ret);
                         hub->tt.hub = hdev;
                         break;
+                case 3:
+                        /* USB 3.0 hubs don't have a TT */
+                        break;
                 default:
                         dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
                                 hdev->descriptor.bDeviceProtocol);
diff --git a/drivers/usb/core/hub.h b/drivers/usb/core/hub.h
index 2a116ce53c9..889c0f32a40 100644
--- a/drivers/usb/core/hub.h
+++ b/drivers/usb/core/hub.h
@@ -47,7 +47,10 @@
 #define USB_PORT_FEAT_L1                5       /* L1 suspend */
 #define USB_PORT_FEAT_POWER             8
 #define USB_PORT_FEAT_LOWSPEED          9
+/* This value was never in Table 11-17 */
 #define USB_PORT_FEAT_HIGHSPEED         10
+/* This value is also fake */
+#define USB_PORT_FEAT_SUPERSPEED        11
 #define USB_PORT_FEAT_C_CONNECTION      16
 #define USB_PORT_FEAT_C_ENABLE          17
 #define USB_PORT_FEAT_C_SUSPEND         18