diff options
Diffstat (limited to 'ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortExtLib.c')
| -rw-r--r-- | ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortExtLib.c | 32 |
1 files changed, 24 insertions, 8 deletions
diff --git a/ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortExtLib.c b/ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortExtLib.c index 723a1b1624..7b3cd89298 100644 --- a/ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortExtLib.c +++ b/ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortExtLib.c @@ -1,7 +1,7 @@ /** @file
Serial I/O Port library functions with no library constructor/destructor
- Copyright (c) 2012-2013, ARM Ltd. All rights reserved.<BR>
+ Copyright (c) 2012-2014, ARM Ltd. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
@@ -65,19 +65,35 @@ SerialPortSetAttributes ( }
/**
- Set the serial device control bits.
- @param Control Control bits which are to be set on the serial device.
-
- @retval EFI_SUCCESS The new control bits were set on the serial device.
- @retval EFI_UNSUPPORTED The serial device does not support this operation.
- @retval EFI_DEVICE_ERROR The serial device is not functioning correctly.
+ Assert or deassert the control signals on a serial port.
+ The following control signals are set according their bit settings :
+ . Request to Send
+ . Data Terminal Ready
+
+ @param[in] Control The following bits are taken into account :
+ . EFI_SERIAL_REQUEST_TO_SEND : assert/deassert the
+ "Request To Send" control signal if this bit is
+ equal to one/zero.
+ . EFI_SERIAL_DATA_TERMINAL_READY : assert/deassert
+ the "Data Terminal Ready" control signal if this
+ bit is equal to one/zero.
+ . EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE : enable/disable
+ the hardware loopback if this bit is equal to
+ one/zero.
+ . EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE : not supported.
+ . EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE : enable/
+ disable the hardware flow control based on CTS (Clear
+ To Send) and RTS (Ready To Send) control signals.
+
+ @retval RETURN_SUCCESS The new control bits were set on the serial device.
+ @retval RETURN_UNSUPPORTED The serial device does not support this operation.
**/
RETURN_STATUS
EFIAPI
SerialPortSetControl (
- IN UINT32 Control
+ IN UINT32 Control
)
{
return PL011UartSetControl ((UINTN)PcdGet64 (PcdSerialRegisterBase), Control);
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