[xhci] Enable USB3 ports on Intel PCH8/PCH9 controllers

Intel PCH controllers default to routing USB2 ports to EHCI rather
than xHCI, and default to disabling SuperSpeed connections.
Manipulate the PCI configuration space registers as necessary to
reroute ports and enable SuperSpeed.

Originally-fixed-by: Dan Ellis <Dan.Ellis@displaylink.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

1 files changed, 40 insertions, 0 deletions

diff --git a/src/drivers/usb/xhci.c b/src/drivers/usb/xhci.c
index 36dfacc2..5d4cb151 100644
--- a/src/drivers/usb/xhci.c
+++ b/src/drivers/usb/xhci.c
@@ -3014,6 +3014,41 @@ static struct usb_host_operations xhci_operations = {
 };
 
 /**
+ * Fix Intel PCH-specific quirks
+ *
+ * @v xhci		xHCI device
+ * @v pci		PCI device
+ */
+static void xhci_pch ( struct xhci_device *xhci, struct pci_device *pci ) {
+	uint32_t xusb2pr;
+	uint32_t xusb2prm;
+	uint32_t usb3pssen;
+	uint32_t usb3prm;
+
+	/* Enable SuperSpeed capability.  Do this before rerouting
+	 * USB2 ports, so that USB3 devices connect at SuperSpeed.
+	 */
+	pci_read_config_dword ( pci, XHCI_PCH_USB3PSSEN, &usb3pssen );
+	pci_read_config_dword ( pci, XHCI_PCH_USB3PRM, &usb3prm );
+	if ( usb3prm & ~usb3pssen ) {
+		DBGC ( xhci, "XHCI %p enabling SuperSpeed on ports %08x\n",
+		       xhci, ( usb3prm & ~usb3pssen ) );
+	}
+	usb3pssen |= usb3prm;
+	pci_write_config_dword ( pci, XHCI_PCH_USB3PSSEN, usb3pssen );
+
+	/* Route USB2 ports from EHCI to xHCI */
+	pci_read_config_dword ( pci, XHCI_PCH_XUSB2PR, &xusb2pr );
+	pci_read_config_dword ( pci, XHCI_PCH_XUSB2PRM, &xusb2prm );
+	if ( xusb2prm & ~xusb2pr ) {
+		DBGC ( xhci, "XHCI %p routing ports %08x from EHCI to xHCI\n",
+		       xhci, ( xusb2prm & ~xusb2pr ) );
+	}
+	xusb2pr |= xusb2prm;
+	pci_write_config_dword ( pci, XHCI_PCH_XUSB2PR, xusb2pr );
+}
+
+/**
  * Probe PCI device
  *
  * @v pci		PCI device
@@ -3054,6 +3089,10 @@ static int xhci_probe ( struct pci_device *pci ) {
 	if ( ( rc = xhci_legacy_claim ( xhci ) ) != 0 )
 		goto err_legacy_claim;
 
+	/* Fix Intel PCH-specific quirks, if applicable */
+	if ( pci->id->driver_data & XHCI_PCH )
+		xhci_pch ( xhci, pci );
+
 	/* Reset device */
 	if ( ( rc = xhci_reset ( xhci ) ) != 0 )
 		goto err_reset;
@@ -3115,6 +3154,7 @@ static void xhci_remove ( struct pci_device *pci ) {
 
 /** XHCI PCI device IDs */
 static struct pci_device_id xhci_ids[] = {
+	PCI_ROM ( 0x8086, 0xffff, "xhci-pch", "xHCI (Intel PCH)", XHCI_PCH ),
 	PCI_ROM ( 0xffff, 0xffff, "xhci", "xHCI", 0 ),
 };