diff options
Diffstat (limited to 'ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortExtLib.c')
| -rw-r--r-- | ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortExtLib.c | 32 |
1 files changed, 25 insertions, 7 deletions
diff --git a/ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortExtLib.c b/ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortExtLib.c index 7b3cd89298..44fe78f4f4 100644 --- a/ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortExtLib.c +++ b/ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortExtLib.c @@ -100,20 +100,38 @@ SerialPortSetControl ( }
/**
- Get the serial device control bits.
- @param Control Control signals read from the serial device.
-
- @retval EFI_SUCCESS The control bits were read from the serial device.
- @retval EFI_DEVICE_ERROR The serial device is not functioning correctly.
+ Retrieve the status of the control bits on a serial device.
+
+ @param[out] Control Status of the control bits on a serial device :
+
+ . EFI_SERIAL_DATA_CLEAR_TO_SEND, EFI_SERIAL_DATA_SET_READY,
+ EFI_SERIAL_RING_INDICATE, EFI_SERIAL_CARRIER_DETECT,
+ EFI_SERIAL_REQUEST_TO_SEND, EFI_SERIAL_DATA_TERMINAL_READY
+ are all related to the DTE (Data Terminal Equipment) and
+ DCE (Data Communication Equipment) modes of operation of
+ the serial device.
+ . EFI_SERIAL_INPUT_BUFFER_EMPTY : equal to one if the receive
+ buffer is empty, 0 otherwise.
+ . EFI_SERIAL_OUTPUT_BUFFER_EMPTY : equal to one if the transmit
+ buffer is empty, 0 otherwise.
+ . EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE : equal to one if the
+ hardware loopback is enabled (the ouput feeds the receive
+ buffer), 0 otherwise.
+ . EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE : equal to one if a
+ loopback is accomplished by software, 0 otherwise.
+ . EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE : equal to one if the
+ hardware flow control based on CTS (Clear To Send) and RTS
+ (Ready To Send) control signals is enabled, 0 otherwise.
+
+ @retval RETURN_SUCCESS The control bits were read from the serial device.
**/
RETURN_STATUS
EFIAPI
SerialPortGetControl (
- OUT UINT32 *Control
+ OUT UINT32 *Control
)
{
return PL011UartGetControl ((UINTN)PcdGet64 (PcdSerialRegisterBase), Control);
}
-
|