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path: root/drivers/usb/host/pci-quirks.c
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Diffstat (limited to 'drivers/usb/host/pci-quirks.c')
-rw-r--r--drivers/usb/host/pci-quirks.c214
1 files changed, 144 insertions, 70 deletions
diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
index 9b166d70ae9..fd930618c28 100644
--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -14,6 +14,7 @@
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/acpi.h>
+#include <linux/dmi.h>
#include "pci-quirks.h"
#include "xhci-ext-caps.h"
@@ -68,6 +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;
@@ -503,14 +507,84 @@ static void __devinit quirk_usb_handoff_ohci(struct pci_dev *pdev)
iounmap(base);
}
+static void __devinit ehci_bios_handoff(struct pci_dev *pdev,
+ void __iomem *op_reg_base,
+ u32 cap, u8 offset)
+{
+ int try_handoff = 1, tried_handoff = 0;
+
+ /* The Pegatron Lucid (ExoPC) tablet sporadically waits for 90
+ * seconds trying the handoff on its unused controller. Skip
+ * it. */
+ if (pdev->vendor == 0x8086 && pdev->device == 0x283a) {
+ const char *dmi_bn = dmi_get_system_info(DMI_BOARD_NAME);
+ const char *dmi_bv = dmi_get_system_info(DMI_BIOS_VERSION);
+ if (dmi_bn && !strcmp(dmi_bn, "EXOPG06411") &&
+ dmi_bv && !strcmp(dmi_bv, "Lucid-CE-133"))
+ try_handoff = 0;
+ }
+
+ if (try_handoff && (cap & EHCI_USBLEGSUP_BIOS)) {
+ dev_dbg(&pdev->dev, "EHCI: BIOS handoff\n");
+
+#if 0
+/* aleksey_gorelov@phoenix.com reports that some systems need SMI forced on,
+ * but that seems dubious in general (the BIOS left it off intentionally)
+ * and is known to prevent some systems from booting. so we won't do this
+ * unless maybe we can determine when we're on a system that needs SMI forced.
+ */
+ /* BIOS workaround (?): be sure the pre-Linux code
+ * receives the SMI
+ */
+ pci_read_config_dword(pdev, offset + EHCI_USBLEGCTLSTS, &val);
+ pci_write_config_dword(pdev, offset + EHCI_USBLEGCTLSTS,
+ val | EHCI_USBLEGCTLSTS_SOOE);
+#endif
+
+ /* some systems get upset if this semaphore is
+ * set for any other reason than forcing a BIOS
+ * handoff..
+ */
+ pci_write_config_byte(pdev, offset + 3, 1);
+ }
+
+ /* if boot firmware now owns EHCI, spin till it hands it over. */
+ if (try_handoff) {
+ int msec = 1000;
+ while ((cap & EHCI_USBLEGSUP_BIOS) && (msec > 0)) {
+ tried_handoff = 1;
+ msleep(10);
+ msec -= 10;
+ pci_read_config_dword(pdev, offset, &cap);
+ }
+ }
+
+ if (cap & EHCI_USBLEGSUP_BIOS) {
+ /* well, possibly buggy BIOS... try to shut it down,
+ * and hope nothing goes too wrong
+ */
+ if (try_handoff)
+ dev_warn(&pdev->dev, "EHCI: BIOS handoff failed"
+ " (BIOS bug?) %08x\n", cap);
+ pci_write_config_byte(pdev, offset + 2, 0);
+ }
+
+ /* just in case, always disable EHCI SMIs */
+ pci_write_config_dword(pdev, offset + EHCI_USBLEGCTLSTS, 0);
+
+ /* If the BIOS ever owned the controller then we can't expect
+ * any power sessions to remain intact.
+ */
+ if (tried_handoff)
+ writel(0, op_reg_base + EHCI_CONFIGFLAG);
+}
+
static void __devinit quirk_usb_disable_ehci(struct pci_dev *pdev)
{
- int wait_time, delta;
void __iomem *base, *op_reg_base;
- u32 hcc_params, val;
+ u32 hcc_params, cap, val;
u8 offset, cap_length;
- int count = 256/4;
- int tried_handoff = 0;
+ int wait_time, delta, count = 256/4;
if (!mmio_resource_enabled(pdev, 0))
return;
@@ -529,77 +603,17 @@ static void __devinit quirk_usb_disable_ehci(struct pci_dev *pdev)
hcc_params = readl(base + EHCI_HCC_PARAMS);
offset = (hcc_params >> 8) & 0xff;
while (offset && --count) {
- u32 cap;
- int msec;
-
pci_read_config_dword(pdev, offset, &cap);
- switch (cap & 0xff) {
- case 1: /* BIOS/SMM/... handoff support */
- if ((cap & EHCI_USBLEGSUP_BIOS)) {
- dev_dbg(&pdev->dev, "EHCI: BIOS handoff\n");
-
-#if 0
-/* aleksey_gorelov@phoenix.com reports that some systems need SMI forced on,
- * but that seems dubious in general (the BIOS left it off intentionally)
- * and is known to prevent some systems from booting. so we won't do this
- * unless maybe we can determine when we're on a system that needs SMI forced.
- */
- /* BIOS workaround (?): be sure the
- * pre-Linux code receives the SMI
- */
- pci_read_config_dword(pdev,
- offset + EHCI_USBLEGCTLSTS,
- &val);
- pci_write_config_dword(pdev,
- offset + EHCI_USBLEGCTLSTS,
- val | EHCI_USBLEGCTLSTS_SOOE);
-#endif
-
- /* some systems get upset if this semaphore is
- * set for any other reason than forcing a BIOS
- * handoff..
- */
- pci_write_config_byte(pdev, offset + 3, 1);
- }
- /* if boot firmware now owns EHCI, spin till
- * it hands it over.
- */
- msec = 1000;
- while ((cap & EHCI_USBLEGSUP_BIOS) && (msec > 0)) {
- tried_handoff = 1;
- msleep(10);
- msec -= 10;
- pci_read_config_dword(pdev, offset, &cap);
- }
-
- if (cap & EHCI_USBLEGSUP_BIOS) {
- /* well, possibly buggy BIOS... try to shut
- * it down, and hope nothing goes too wrong
- */
- dev_warn(&pdev->dev, "EHCI: BIOS handoff failed"
- " (BIOS bug?) %08x\n", cap);
- pci_write_config_byte(pdev, offset + 2, 0);
- }
-
- /* just in case, always disable EHCI SMIs */
- pci_write_config_dword(pdev,
- offset + EHCI_USBLEGCTLSTS,
- 0);
-
- /* If the BIOS ever owned the controller then we
- * can't expect any power sessions to remain intact.
- */
- if (tried_handoff)
- writel(0, op_reg_base + EHCI_CONFIGFLAG);
+ switch (cap & 0xff) {
+ case 1:
+ ehci_bios_handoff(pdev, op_reg_base, cap, offset);
break;
- case 0: /* illegal reserved capability */
- cap = 0;
- /* FALLTHROUGH */
+ case 0: /* Illegal reserved cap, set cap=0 so we exit */
+ cap = 0; /* then fallthrough... */
default:
dev_warn(&pdev->dev, "EHCI: unrecognized capability "
- "%02x\n", cap & 0xff);
- break;
+ "%02x\n", cap & 0xff);
}
offset = (cap >> 8) & 0xff;
}
@@ -662,6 +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.
*
@@ -721,6 +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));
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-03-22 13:20:54 +0000