From ab716191081e676179c5d386c706e05e2d940db5 Mon Sep 17 00:00:00 2001 From: Ronald Cron Date: Mon, 27 Oct 2014 15:37:37 +0000 Subject: EmbeddedPkg: Clarify the declaration of SerialPortSetControl() Rework of PL011UartSetControl() as a consequence as well as update of function header comment blocks. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ronald Cron Reviewed-By: Olivier Martin git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16251 6f19259b-4bc3-4df7-8a09-765794883524 --- ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c | 68 ++++++++++++++-------- ArmPlatformPkg/Include/Drivers/PL011Uart.h | 36 ++++++++---- .../PL011SerialPortLib/PL011SerialPortExtLib.c | 32 +++++++--- 3 files changed, 95 insertions(+), 41 deletions(-) (limited to 'ArmPlatformPkg') diff --git a/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c b/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c index fd686799b2..a40e269d07 100644 --- a/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c +++ b/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c @@ -2,7 +2,7 @@ Serial I/O Port library functions with no library constructor/destructor Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.
- Copyright (c) 2011 - 2013, ARM Ltd. All rights reserved.
+ Copyright (c) 2011 - 2014, ARM Ltd. All rights reserved.
This program and the accompanying materials are licensed and made available under the terms and conditions of the BSD License @@ -20,6 +20,12 @@ #include +// +// EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE is the only +// control bit that is not supported. +// +STATIC CONST UINT32 mInvalidControlBits = EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE; + /* Initialise the serial port to the specified settings. @@ -159,53 +165,69 @@ PL011UartInitializePort ( } /** - Set the serial device control bits. - @param UartBase The base address of the PL011 UART. - @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] UartBase UART registers base address + @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 PL011UartSetControl ( - IN UINTN UartBase, - IN UINT32 Control + IN UINTN UartBase, + IN UINT32 Control ) { - UINT32 Bits; - UINT32 ValidControlBits; - - ValidControlBits = ( EFI_SERIAL_REQUEST_TO_SEND - | EFI_SERIAL_DATA_TERMINAL_READY - // | EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE // Not implemented yet. - // | EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE // Not implemented yet. - | EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE - ); - - if (Control & (~ValidControlBits)) { - return EFI_UNSUPPORTED; + UINT32 Bits; + + if (Control & (mInvalidControlBits)) { + return RETURN_UNSUPPORTED; } Bits = MmioRead32 (UartBase + UARTCR); if (Control & EFI_SERIAL_REQUEST_TO_SEND) { Bits |= PL011_UARTCR_RTS; + } else { + Bits &= ~PL011_UARTCR_RTS; } if (Control & EFI_SERIAL_DATA_TERMINAL_READY) { Bits |= PL011_UARTCR_DTR; + } else { + Bits &= ~PL011_UARTCR_DTR; } if (Control & EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE) { Bits |= PL011_UARTCR_LBE; + } else { + Bits &= ~PL011_UARTCR_LBE; } if (Control & EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE) { - Bits |= (PL011_UARTCR_CTSEN & PL011_UARTCR_RTSEN); + Bits |= (PL011_UARTCR_CTSEN | PL011_UARTCR_RTSEN); + } else { + Bits &= ~(PL011_UARTCR_CTSEN | PL011_UARTCR_RTSEN); } MmioWrite32 (UartBase + UARTCR, Bits); diff --git a/ArmPlatformPkg/Include/Drivers/PL011Uart.h b/ArmPlatformPkg/Include/Drivers/PL011Uart.h index a36347e529..f8e4a083aa 100644 --- a/ArmPlatformPkg/Include/Drivers/PL011Uart.h +++ b/ArmPlatformPkg/Include/Drivers/PL011Uart.h @@ -1,6 +1,6 @@ /** @file * -* Copyright (c) 2011-2012, ARM Limited. All rights reserved. +* Copyright (c) 2011-2014, ARM Limited. All rights reserved. * * This program and the accompanying materials * are licensed and made available under the terms and conditions of the BSD License @@ -100,21 +100,37 @@ PL011UartInitializePort ( ); /** - Set the serial device control bits. - @param UartBase The base address of the PL011 UART. - @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] UartBase UART registers base address + @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 PL011UartSetControl ( - IN UINTN UartBase, - IN UINT32 Control + IN UINTN UartBase, + IN UINT32 Control ); /** 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.
+ Copyright (c) 2012-2014, ARM Ltd. All rights reserved.
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); -- cgit v1.2.3