/**
Interface function to reset the port.
@param HubIf The hub interface.
@param Port The port to reset.
@retval EFI_SUCCESS The hub port is reset.
@retval EFI_TIMEOUT Failed to reset the port in time.
@retval Others Failed to reset the port.
**/
EFI_STATUS
UsbHubResetPort (
IN USB_INTERFACE *HubIf,
IN UINT8 Port
)
{
EFI_USB_PORT_STATUS PortState;
UINTN Index;
EFI_STATUS Status;
Status = UsbHubGetPortStatus (HubIf, Port, &PortState);
if (EFI_ERROR (Status)) {
return Status;
} else if (USB_BIT_IS_SET (PortState.PortChangeStatus, USB_PORT_STAT_C_RESET)) {
DEBUG (( EFI_D_INFO, "UsbHubResetPort: skip reset on hub %p port %d\n", HubIf, Port));
return EFI_SUCCESS;
}
Status = UsbHubSetPortFeature (HubIf, Port, (EFI_USB_PORT_FEATURE) USB_HUB_PORT_RESET);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Drive the reset signal for worst 20ms. Check USB 2.0 Spec
// section 7.1.7.5 for timing requirements.
//
gBS->Stall (USB_SET_PORT_RESET_STALL);
//
// Check USB_PORT_STAT_C_RESET bit to see if the resetting state is done.
//
ZeroMem (&PortState, sizeof (EFI_USB_PORT_STATUS));
for (Index = 0; Index < USB_WAIT_PORT_STS_CHANGE_LOOP; Index++) {
Status = UsbHubGetPortStatus (HubIf, Port, &PortState);
if (EFI_ERROR (Status)) {
return Status;
}
if (!EFI_ERROR (Status) &&
USB_BIT_IS_SET (PortState.PortChangeStatus, USB_PORT_STAT_C_RESET)) {
gBS->Stall (USB_SET_PORT_RECOVERY_STALL);
return EFI_SUCCESS;
}
gBS->Stall (USB_WAIT_PORT_STS_CHANGE_STALL);
}
return EFI_TIMEOUT;
}
/**
Clear the port change status.
@param HubIf The hub interface.
@param Port The hub port.
**/
VOID
UsbHubClearPortChange (
IN USB_INTERFACE *HubIf,
IN UINT8 Port
)
{
EFI_USB_PORT_STATUS PortState;
USB_CHANGE_FEATURE_MAP *Map;
UINTN Index;
EFI_STATUS Status;
Status = UsbHubGetPortStatus (HubIf, Port, &PortState);
if (EFI_ERROR (Status)) {
return;
}
//
// OK, get the usb port status, now ACK the change bits.
// Don't return error when failed to clear the change bits.
// It may lead to extra port state report. USB bus should
// be able to handle this.
//
for (Index = 0; Index < USB_HUB_MAP_SIZE; Index++) {
Map = &mHubFeatureMap[Index];
if (USB_BIT_IS_SET (PortState.PortChangeStatus, Map->ChangedBit)) {
UsbHubCtrlClearPortFeature (HubIf->Device, Port, (UINT16) Map->Feature);
}
}
}
/**
Interface function to reset the port.
@param HubIf The hub interface.
@param Port The port to reset.
@retval EFI_SUCCESS The hub port is reset.
@retval EFI_TIMEOUT Failed to reset the port in time.
@retval Others Failed to reset the port.
**/
EFI_STATUS
UsbHubResetPort (
IN USB_INTERFACE *HubIf,
IN UINT8 Port
)
{
EFI_USB_PORT_STATUS PortState;
UINTN Index;
EFI_STATUS Status;
Status = UsbHubSetPortFeature (HubIf, Port, (EFI_USB_PORT_FEATURE) USB_HUB_PORT_RESET);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Drive the reset signal for at least 10ms. Check USB 2.0 Spec
// section 7.1.7.5 for timing requirements.
//
gBS->Stall (USB_SET_PORT_RESET_STALL);
//
// USB hub will clear RESET bit if reset is actually finished.
//
ZeroMem (&PortState, sizeof (EFI_USB_PORT_STATUS));
for (Index = 0; Index < USB_WAIT_PORT_STS_CHANGE_LOOP; Index++) {
Status = UsbHubGetPortStatus (HubIf, Port, &PortState);
if (!EFI_ERROR (Status) &&
!USB_BIT_IS_SET (PortState.PortStatus, USB_PORT_STAT_RESET)) {
return EFI_SUCCESS;
}
gBS->Stall (USB_WAIT_PORT_STS_CHANGE_STALL);
}
return EFI_TIMEOUT;
}