Serial I/O Port library functions with no library constructor/destructor\r
\r
Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>\r
- Copyright (c) 2011 - 2013, ARM Ltd. All rights reserved.<BR>\r
+ Copyright (c) 2011 - 2014, ARM Ltd. All rights reserved.<BR>\r
\r
This program and the accompanying materials\r
are licensed and made available under the terms and conditions of the BSD License\r
\r
#include <Drivers/PL011Uart.h>\r
\r
+//\r
+// EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE is the only\r
+// control bit that is not supported.\r
+//\r
+STATIC CONST UINT32 mInvalidControlBits = EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE;\r
+\r
/*\r
\r
Initialise the serial port to the specified settings.\r
}\r
\r
/**\r
- Set the serial device control bits.\r
\r
- @param UartBase The base address of the PL011 UART.\r
- @param Control Control bits which are to be set on the serial device.\r
-\r
- @retval EFI_SUCCESS The new control bits were set on the serial device.\r
- @retval EFI_UNSUPPORTED The serial device does not support this operation.\r
- @retval EFI_DEVICE_ERROR The serial device is not functioning correctly.\r
+ Assert or deassert the control signals on a serial port.\r
+ The following control signals are set according their bit settings :\r
+ . Request to Send\r
+ . Data Terminal Ready\r
+\r
+ @param[in] UartBase UART registers base address\r
+ @param[in] Control The following bits are taken into account :\r
+ . EFI_SERIAL_REQUEST_TO_SEND : assert/deassert the\r
+ "Request To Send" control signal if this bit is\r
+ equal to one/zero.\r
+ . EFI_SERIAL_DATA_TERMINAL_READY : assert/deassert\r
+ the "Data Terminal Ready" control signal if this\r
+ bit is equal to one/zero.\r
+ . EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE : enable/disable\r
+ the hardware loopback if this bit is equal to\r
+ one/zero.\r
+ . EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE : not supported.\r
+ . EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE : enable/\r
+ disable the hardware flow control based on CTS (Clear\r
+ To Send) and RTS (Ready To Send) control signals.\r
+\r
+ @retval RETURN_SUCCESS The new control bits were set on the serial device.\r
+ @retval RETURN_UNSUPPORTED The serial device does not support this operation.\r
\r
**/\r
RETURN_STATUS\r
EFIAPI\r
PL011UartSetControl (\r
- IN UINTN UartBase,\r
- IN UINT32 Control\r
+ IN UINTN UartBase,\r
+ IN UINT32 Control\r
)\r
{\r
- UINT32 Bits;\r
- UINT32 ValidControlBits;\r
-\r
- ValidControlBits = ( EFI_SERIAL_REQUEST_TO_SEND\r
- | EFI_SERIAL_DATA_TERMINAL_READY\r
- // | EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE // Not implemented yet.\r
- // | EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE // Not implemented yet.\r
- | EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE\r
- );\r
-\r
- if (Control & (~ValidControlBits)) {\r
- return EFI_UNSUPPORTED;\r
+ UINT32 Bits;\r
+\r
+ if (Control & (mInvalidControlBits)) {\r
+ return RETURN_UNSUPPORTED;\r
}\r
\r
Bits = MmioRead32 (UartBase + UARTCR);\r
\r
if (Control & EFI_SERIAL_REQUEST_TO_SEND) {\r
Bits |= PL011_UARTCR_RTS;\r
+ } else {\r
+ Bits &= ~PL011_UARTCR_RTS;\r
}\r
\r
if (Control & EFI_SERIAL_DATA_TERMINAL_READY) {\r
Bits |= PL011_UARTCR_DTR;\r
+ } else {\r
+ Bits &= ~PL011_UARTCR_DTR;\r
}\r
\r
if (Control & EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE) {\r
Bits |= PL011_UARTCR_LBE;\r
+ } else {\r
+ Bits &= ~PL011_UARTCR_LBE;\r
}\r
\r
if (Control & EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE) {\r
- Bits |= (PL011_UARTCR_CTSEN & PL011_UARTCR_RTSEN);\r
+ Bits |= (PL011_UARTCR_CTSEN | PL011_UARTCR_RTSEN);\r
+ } else {\r
+ Bits &= ~(PL011_UARTCR_CTSEN | PL011_UARTCR_RTSEN);\r
}\r
\r
MmioWrite32 (UartBase + UARTCR, Bits);\r