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-rw-r--r--drivers/usb/host/ehci-pci.c39
-rw-r--r--drivers/usb/host/pci-quirks.c63
-rw-r--r--drivers/usb/host/pci-quirks.h2
-rw-r--r--drivers/usb/host/xhci-pci.c20
4 files changed, 124 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index 660b80a75cac..1102ce65a3a9 100644
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -348,11 +348,50 @@ static int ehci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
return rc;
}
+static bool usb_is_intel_switchable_ehci(struct pci_dev *pdev)
+{
+ return pdev->class == PCI_CLASS_SERIAL_USB_EHCI &&
+ pdev->vendor == PCI_VENDOR_ID_INTEL &&
+ pdev->device == 0x1E26;
+}
+
+static void ehci_enable_xhci_companion(void)
+{
+ struct pci_dev *companion = NULL;
+
+ /* The xHCI and EHCI controllers are not on the same PCI slot */
+ for_each_pci_dev(companion) {
+ if (!usb_is_intel_switchable_xhci(companion))
+ continue;
+ usb_enable_xhci_ports(companion);
+ return;
+ }
+}
+
static int ehci_pci_resume(struct usb_hcd *hcd, bool hibernated)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
+ /* The BIOS on systems with the Intel Panther Point chipset may or may
+ * not support xHCI natively. That means that during system resume, it
+ * may switch the ports back to EHCI so that users can use their
+ * keyboard to select a kernel from GRUB after resume from hibernate.
+ *
+ * The BIOS is supposed to remember whether the OS had xHCI ports
+ * enabled before resume, and switch the ports back to xHCI when the
+ * BIOS/OS semaphore is written, but we all know we can't trust BIOS
+ * writers.
+ *
+ * Unconditionally switch the ports back to xHCI after a system resume.
+ * We can't tell whether the EHCI or xHCI controller will be resumed
+ * first, so we have to do the port switchover in both drivers. Writing
+ * a '1' to the port switchover registers should have no effect if the
+ * port was already switched over.
+ */
+ if (usb_is_intel_switchable_ehci(pdev))
+ ehci_enable_xhci_companion();
+
// maybe restore FLADJ
if (time_before(jiffies, ehci->next_statechange))
diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
index f16c59d5f487..fd930618c28f 100644
--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -69,6 +69,9 @@
#define NB_PIF0_PWRDOWN_0 0x01100012
#define NB_PIF0_PWRDOWN_1 0x01100013
+#define USB_INTEL_XUSB2PR 0xD0
+#define USB_INTEL_USB3_PSSEN 0xD8
+
static struct amd_chipset_info {
struct pci_dev *nb_dev;
struct pci_dev *smbus_dev;
@@ -673,6 +676,64 @@ static int handshake(void __iomem *ptr, u32 mask, u32 done,
return -ETIMEDOUT;
}
+bool usb_is_intel_switchable_xhci(struct pci_dev *pdev)
+{
+ return pdev->class == PCI_CLASS_SERIAL_USB_XHCI &&
+ pdev->vendor == PCI_VENDOR_ID_INTEL &&
+ pdev->device == PCI_DEVICE_ID_INTEL_PANTHERPOINT_XHCI;
+}
+EXPORT_SYMBOL_GPL(usb_is_intel_switchable_xhci);
+
+/*
+ * Intel's Panther Point chipset has two host controllers (EHCI and xHCI) that
+ * share some number of ports. These ports can be switched between either
+ * controller. Not all of the ports under the EHCI host controller may be
+ * switchable.
+ *
+ * The ports should be switched over to xHCI before PCI probes for any device
+ * start. This avoids active devices under EHCI being disconnected during the
+ * port switchover, which could cause loss of data on USB storage devices, or
+ * failed boot when the root file system is on a USB mass storage device and is
+ * enumerated under EHCI first.
+ *
+ * We write into the xHC's PCI configuration space in some Intel-specific
+ * registers to switch the ports over. The USB 3.0 terminations and the USB
+ * 2.0 data wires are switched separately. We want to enable the SuperSpeed
+ * terminations before switching the USB 2.0 wires over, so that USB 3.0
+ * devices connect at SuperSpeed, rather than at USB 2.0 speeds.
+ */
+void usb_enable_xhci_ports(struct pci_dev *xhci_pdev)
+{
+ u32 ports_available;
+
+ ports_available = 0xffffffff;
+ /* Write USB3_PSSEN, the USB 3.0 Port SuperSpeed Enable
+ * Register, to turn on SuperSpeed terminations for all
+ * available ports.
+ */
+ pci_write_config_dword(xhci_pdev, USB_INTEL_USB3_PSSEN,
+ cpu_to_le32(ports_available));
+
+ pci_read_config_dword(xhci_pdev, USB_INTEL_USB3_PSSEN,
+ &ports_available);
+ dev_dbg(&xhci_pdev->dev, "USB 3.0 ports that are now enabled "
+ "under xHCI: 0x%x\n", ports_available);
+
+ ports_available = 0xffffffff;
+ /* Write XUSB2PR, the xHC USB 2.0 Port Routing Register, to
+ * switch the USB 2.0 power and data lines over to the xHCI
+ * host.
+ */
+ pci_write_config_dword(xhci_pdev, USB_INTEL_XUSB2PR,
+ cpu_to_le32(ports_available));
+
+ pci_read_config_dword(xhci_pdev, USB_INTEL_XUSB2PR,
+ &ports_available);
+ dev_dbg(&xhci_pdev->dev, "USB 2.0 ports that are now switched over "
+ "to xHCI: 0x%x\n", ports_available);
+}
+EXPORT_SYMBOL_GPL(usb_enable_xhci_ports);
+
/**
* PCI Quirks for xHCI.
*
@@ -732,6 +793,8 @@ static void __devinit quirk_usb_handoff_xhci(struct pci_dev *pdev)
writel(XHCI_LEGACY_DISABLE_SMI,
base + ext_cap_offset + XHCI_LEGACY_CONTROL_OFFSET);
+ if (usb_is_intel_switchable_xhci(pdev))
+ usb_enable_xhci_ports(pdev);
hc_init:
op_reg_base = base + XHCI_HC_LENGTH(readl(base));
diff --git a/drivers/usb/host/pci-quirks.h b/drivers/usb/host/pci-quirks.h
index 6ae9f78e9938..b1002a8ef96f 100644
--- a/drivers/usb/host/pci-quirks.h
+++ b/drivers/usb/host/pci-quirks.h
@@ -8,6 +8,8 @@ int usb_amd_find_chipset_info(void);
void usb_amd_dev_put(void);
void usb_amd_quirk_pll_disable(void);
void usb_amd_quirk_pll_enable(void);
+bool usb_is_intel_switchable_xhci(struct pci_dev *pdev);
+void usb_enable_xhci_ports(struct pci_dev *xhci_pdev);
#else
static inline void usb_amd_quirk_pll_disable(void) {}
static inline void usb_amd_quirk_pll_enable(void) {}
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index cbc4d491e626..faf039ac6573 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -242,8 +242,28 @@ static int xhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
static int xhci_pci_resume(struct usb_hcd *hcd, bool hibernated)
{
struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+ struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
int retval = 0;
+ /* The BIOS on systems with the Intel Panther Point chipset may or may
+ * not support xHCI natively. That means that during system resume, it
+ * may switch the ports back to EHCI so that users can use their
+ * keyboard to select a kernel from GRUB after resume from hibernate.
+ *
+ * The BIOS is supposed to remember whether the OS had xHCI ports
+ * enabled before resume, and switch the ports back to xHCI when the
+ * BIOS/OS semaphore is written, but we all know we can't trust BIOS
+ * writers.
+ *
+ * Unconditionally switch the ports back to xHCI after a system resume.
+ * We can't tell whether the EHCI or xHCI controller will be resumed
+ * first, so we have to do the port switchover in both drivers. Writing
+ * a '1' to the port switchover registers should have no effect if the
+ * port was already switched over.
+ */
+ if (usb_is_intel_switchable_xhci(pdev))
+ usb_enable_xhci_ports(pdev);
+
retval = xhci_resume(xhci, hibernated);
return retval;
}