/**
Reset the XHCI host controller.
@param Xhc The XHCI Instance.
@param Timeout Time to wait before abort (in microsecond, us).
@retval EFI_SUCCESS The XHCI host controller is reset.
@return Others Failed to reset the XHCI before Timeout.
**/
EFI_STATUS
XhcResetHC (
IN USB_XHCI_INSTANCE *Xhc,
IN UINT32 Timeout
)
{
EFI_STATUS Status;
Status = EFI_SUCCESS;
DEBUG ((EFI_D_INFO, "XhcResetHC!\n"));
//
// Host can only be reset when it is halt. If not so, halt it
//
if (!XHC_REG_BIT_IS_SET (Xhc, XHC_USBSTS_OFFSET, XHC_USBSTS_HALT)) {
Status = XhcHaltHC (Xhc, Timeout);
if (EFI_ERROR (Status)) {
return Status;
}
}
if ((Xhc->DebugCapSupOffset == 0xFFFFFFFF) || ((XhcReadExtCapReg (Xhc, Xhc->DebugCapSupOffset) & 0xFF) != XHC_CAP_USB_DEBUG) ||
((XhcReadExtCapReg (Xhc, Xhc->DebugCapSupOffset + XHC_DC_DCCTRL) & BIT0) == 0)) {
XhcSetOpRegBit (Xhc, XHC_USBCMD_OFFSET, XHC_USBCMD_RESET);
Status = XhcWaitOpRegBit (Xhc, XHC_USBCMD_OFFSET, XHC_USBCMD_RESET, FALSE, Timeout);
}
return Status;
}
/**
Set the XHCI host controller to run.
@param Xhc The XHCI Instance.
@param Timeout Time to wait before abort (in millisecond, ms).
@return EFI_SUCCESS The XHCI host controller is running.
@return EFI_TIMEOUT Failed to set the XHCI to run before Timeout.
**/
EFI_STATUS
XhcRunHC (
IN USB_XHCI_INSTANCE *Xhc,
IN UINT32 Timeout
)
{
EFI_STATUS Status;
XhcSetOpRegBit (Xhc, XHC_USBCMD_OFFSET, XHC_USBCMD_RUN);
Status = XhcWaitOpRegBit (Xhc, XHC_USBSTS_OFFSET, XHC_USBSTS_HALT, FALSE, Timeout);
return Status;
}
/**
Halt the XHCI host controller.
@param Xhc The XHCI Instance.
@param Timeout Time to wait before abort (in millisecond, ms).
@return EFI_SUCCESS The XHCI host controller is halt.
@return EFI_TIMEOUT Failed to halt the XHCI before Timeout.
**/
EFI_STATUS
XhcHaltHC (
IN USB_XHCI_INSTANCE *Xhc,
IN UINT32 Timeout
)
{
EFI_STATUS Status;
XhcClearOpRegBit (Xhc, XHC_USBCMD_OFFSET, XHC_USBCMD_RUN);
Status = XhcWaitOpRegBit (Xhc, XHC_USBSTS_OFFSET, XHC_USBSTS_HALT, TRUE, Timeout);
return Status;
}
/**
Reset the XHCI host controller.
@param Xhc The XHCI Instance.
@param Timeout Time to wait before abort (in millisecond, ms).
@retval EFI_SUCCESS The XHCI host controller is reset.
@return Others Failed to reset the XHCI before Timeout.
**/
EFI_STATUS
XhcResetHC (
IN USB_XHCI_INSTANCE *Xhc,
IN UINT32 Timeout
)
{
EFI_STATUS Status;
DEBUG ((EFI_D_INFO, "XhcResetHC!\n"));
//
// Host can only be reset when it is halt. If not so, halt it
//
if (!XHC_REG_BIT_IS_SET (Xhc, XHC_USBSTS_OFFSET, XHC_USBSTS_HALT)) {
Status = XhcHaltHC (Xhc, Timeout);
if (EFI_ERROR (Status)) {
return Status;
}
}
XhcSetOpRegBit (Xhc, XHC_USBCMD_OFFSET, XHC_USBCMD_RESET);
Status = XhcWaitOpRegBit (Xhc, XHC_USBCMD_OFFSET, XHC_USBCMD_RESET, FALSE, Timeout);
return Status;
}
/**
Reset the XHCI host controller.
@param Xhc The XHCI Instance.
@param Timeout Time to wait before abort (in millisecond, ms).
@retval EFI_SUCCESS The XHCI host controller is reset.
@return Others Failed to reset the XHCI before Timeout.
**/
EFI_STATUS
XhcResetHC (
IN USB_XHCI_INSTANCE *Xhc,
IN UINT32 Timeout
)
{
EFI_STATUS Status;
Status = EFI_SUCCESS;
DEBUG ((EFI_D_INFO, "XhcResetHC!\n"));
//
// Host can only be reset when it is halt. If not so, halt it
//
if (!XHC_REG_BIT_IS_SET (Xhc, XHC_USBSTS_OFFSET, XHC_USBSTS_HALT)) {
Status = XhcHaltHC (Xhc, Timeout);
if (EFI_ERROR (Status)) {
return Status;
}
}
if ((Xhc->DebugCapSupOffset == 0xFFFFFFFF) || ((XhcReadExtCapReg (Xhc, Xhc->DebugCapSupOffset) & 0xFF) != XHC_CAP_USB_DEBUG) ||
((XhcReadExtCapReg (Xhc, Xhc->DebugCapSupOffset + XHC_DC_DCCTRL) & BIT0) == 0)) {
XhcSetOpRegBit (Xhc, XHC_USBCMD_OFFSET, XHC_USBCMD_RESET);
//
// Some XHCI host controllers require to have extra 1ms delay before accessing any MMIO register during reset.
// Otherwise there may have the timeout case happened.
// The below is a workaround to solve such problem.
//
gBS->Stall (XHC_1_MILLISECOND);
Status = XhcWaitOpRegBit (Xhc, XHC_USBCMD_OFFSET, XHC_USBCMD_RESET, FALSE, Timeout);
}
return Status;
}
