xhci: parse xhci protocol speed ID list for usb 3.1 usage

xhci 1.1 controllers that support USB 3.1 must provide a protocol speed ID
(PSI) list to inform the driver of the supported speeds.

The PSI list can be read from the xhci supported protocol extended
capabilities.
The PSI values will be used to create a USB 3.1 SuperSpeedPlus capability
descriptor for the xhci USB 3.1 roothub.
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/xhci-mem.c

@@ -2072,14 +2072,23 @@ static void xhci_add_in_port(struct xhci_hcd *xhci, unsigned int num_ports,
 {
 	u32 temp, port_offset, port_count;
 	int i;
+	struct xhci_hub *rhub;
 
-	if (major_revision > 0x03) {
+	temp = readl(addr);
+
+	if (XHCI_EXT_PORT_MAJOR(temp) == 0x03) {
+		rhub = &xhci->usb3_rhub;
+	} else if (XHCI_EXT_PORT_MAJOR(temp) <= 0x02) {
+		rhub = &xhci->usb2_rhub;
+	} else {
 		xhci_warn(xhci, "Ignoring unknown port speed, "
 				"Ext Cap %p, revision = 0x%x\n",
 				addr, major_revision);
 		/* Ignoring port protocol we can't understand. FIXME */
 		return;
 	}
+	rhub->maj_rev = XHCI_EXT_PORT_MAJOR(temp);
+	rhub->min_rev = XHCI_EXT_PORT_MINOR(temp);
 
 	/* Port offset and count in the third dword, see section 7.2 */
 	temp = readl(addr + 2);
@@ -2094,6 +2103,33 @@ static void xhci_add_in_port(struct xhci_hcd *xhci, unsigned int num_ports,
 		/* WTF? "Valid values are ‘1’ to MaxPorts" */
 		return;
 
+	rhub->psi_count = XHCI_EXT_PORT_PSIC(temp);
+	if (rhub->psi_count) {
+		rhub->psi = kcalloc(rhub->psi_count, sizeof(*rhub->psi),
+				    GFP_KERNEL);
+		if (!rhub->psi)
+			rhub->psi_count = 0;
+
+		rhub->psi_uid_count++;
+		for (i = 0; i < rhub->psi_count; i++) {
+			rhub->psi[i] = readl(addr + 4 + i);
+
+			/* count unique ID values, two consecutive entries can
+			 * have the same ID if link is assymetric
+			 */
+			if (i && (XHCI_EXT_PORT_PSIV(rhub->psi[i]) !=
+				  XHCI_EXT_PORT_PSIV(rhub->psi[i - 1])))
+				rhub->psi_uid_count++;
+
+			xhci_dbg(xhci, "PSIV:%d PSIE:%d PLT:%d PFD:%d LP:%d PSIM:%d\n",
+				  XHCI_EXT_PORT_PSIV(rhub->psi[i]),
+				  XHCI_EXT_PORT_PSIE(rhub->psi[i]),
+				  XHCI_EXT_PORT_PLT(rhub->psi[i]),
+				  XHCI_EXT_PORT_PFD(rhub->psi[i]),
+				  XHCI_EXT_PORT_LP(rhub->psi[i]),
+				  XHCI_EXT_PORT_PSIM(rhub->psi[i]));
+		}
+	}
 	/* cache usb2 port capabilities */
 	if (major_revision < 0x03 && xhci->num_ext_caps < max_caps)
 		xhci->ext_caps[xhci->num_ext_caps++] = temp;

drivers/usb/host/xhci.h

@@ -540,9 +540,23 @@ struct xhci_protocol_caps {
 };
 
 #define	XHCI_EXT_PORT_MAJOR(x)	(((x) >> 24) & 0xff)
+#define	XHCI_EXT_PORT_MINOR(x)	(((x) >> 16) & 0xff)
+#define	XHCI_EXT_PORT_PSIC(x)	(((x) >> 28) & 0x0f)
 #define	XHCI_EXT_PORT_OFF(x)	((x) & 0xff)
 #define	XHCI_EXT_PORT_COUNT(x)	(((x) >> 8) & 0xff)
 
+#define	XHCI_EXT_PORT_PSIV(x)	(((x) >> 0) & 0x0f)
+#define	XHCI_EXT_PORT_PSIE(x)	(((x) >> 4) & 0x03)
+#define	XHCI_EXT_PORT_PLT(x)	(((x) >> 6) & 0x03)
+#define	XHCI_EXT_PORT_PFD(x)	(((x) >> 8) & 0x01)
+#define	XHCI_EXT_PORT_LP(x)	(((x) >> 14) & 0x03)
+#define	XHCI_EXT_PORT_PSIM(x)	(((x) >> 16) & 0xffff)
+
+#define PLT_MASK        (0x03 << 6)
+#define PLT_SYM         (0x00 << 6)
+#define PLT_ASYM_RX     (0x02 << 6)
+#define PLT_ASYM_TX     (0x03 << 6)
+
 /**
  * struct xhci_container_ctx
  * @type: Type of context.  Used to calculated offsets to contained contexts.
@@ -1469,6 +1483,14 @@ static inline unsigned int hcd_index(struct usb_hcd *hcd)
 		return 1;
 }
 
+struct xhci_hub {
+	u8	maj_rev;
+	u8	min_rev;
+	u32	*psi;		/* array of protocol speed ID entries */
+	u8	psi_count;
+	u8	psi_uid_count;
+};
+
 /* There is one xhci_hcd structure per controller */
 struct xhci_hcd {
 	struct usb_hcd *main_hcd;
@@ -1608,6 +1630,8 @@ struct xhci_hcd {
 	unsigned int		num_usb3_ports;
 	/* Array of pointers to USB 2.0 PORTSC registers */
 	__le32 __iomem		**usb2_ports;
+	struct xhci_hub		usb2_rhub;
+	struct xhci_hub		usb3_rhub;
 	unsigned int		num_usb2_ports;
 	/* support xHCI 0.96 spec USB2 software LPM */
 	unsigned		sw_lpm_support:1;