diff options
Diffstat (limited to 'ArmPlatformPkg/Drivers')
| -rw-r--r-- | ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c | 137 | ||||
| -rw-r--r-- | ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.inf | 35 |
2 files changed, 172 insertions, 0 deletions
diff --git a/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c b/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c new file mode 100644 index 0000000000..6e15c97277 --- /dev/null +++ b/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.c @@ -0,0 +1,137 @@ +/** @file + Serial I/O Port library functions with no library constructor/destructor + + + Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR> + + This program and the accompanying materials + are licensed and made available under the terms and conditions of the BSD License + which accompanies this distribution. The full text of the license may be found at + http://opensource.org/licenses/bsd-license.php + + THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, + WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. + +**/ + +#include <Include/Uefi.h> + +#include <Library/IoLib.h> + +#include <Drivers/PL011Uart.h> + +/* + + Programmed hardware of Serial port. + + @return Always return EFI_UNSUPPORTED. + +**/ +RETURN_STATUS +EFIAPI +PL011UartInitialize ( + IN UINTN UartBase, + IN UINTN BaudRate, + IN UINTN LineControl + ) +{ + if (BaudRate == 115200) { + // Initialize baud rate generator + MmioWrite32 (UartBase + UARTIBRD, UART_115200_IDIV); + MmioWrite32 (UartBase + UARTFBRD, UART_115200_FDIV); + } else if (BaudRate == 38400) { + // Initialize baud rate generator + MmioWrite32 (UartBase + UARTIBRD, UART_38400_IDIV); + MmioWrite32 (UartBase + UARTFBRD, UART_38400_FDIV); + } else if (BaudRate == 19200) { + // Initialize baud rate generator + MmioWrite32 (UartBase + UARTIBRD, UART_19200_IDIV); + MmioWrite32 (UartBase + UARTFBRD, UART_19200_FDIV); + } else { + return EFI_INVALID_PARAMETER; + } + + // No parity, 1 stop, no fifo, 8 data bits + MmioWrite32 (UartBase + UARTLCR_H, LineControl); + + // Clear any pending errors + MmioWrite32 (UartBase + UARTECR, 0); + + // Enable tx, rx, and uart overall + MmioWrite32 (UartBase + UARTCR, PL011_UARTCR_RXE | PL011_UARTCR_TXE | PL011_UARTCR_UARTEN); + + return EFI_SUCCESS; +} + +/** + Write data to serial device. + + @param Buffer Point of data buffer which need to be written. + @param NumberOfBytes Number of output bytes which are cached in Buffer. + + @retval 0 Write data failed. + @retval !0 Actual number of bytes written to serial device. + +**/ +UINTN +EFIAPI +PL011UartWrite ( + IN UINTN UartBase, + IN UINT8 *Buffer, + IN UINTN NumberOfBytes + ) +{ + UINTN Count; + + for (Count = 0; Count < NumberOfBytes; Count++, Buffer++) { + while ((MmioRead32 (UartBase + UARTFR) & UART_TX_EMPTY_FLAG_MASK) == 0); + MmioWrite8 (UartBase + UARTDR, *Buffer); + } + + return NumberOfBytes; +} + +/** + Read data from serial device and save the data in buffer. + + @param Buffer Point of data buffer which need to be written. + @param NumberOfBytes Number of output bytes which are cached in Buffer. + + @retval 0 Read data failed. + @retval !0 Actual number of bytes read from serial device. + +**/ +UINTN +EFIAPI +PL011UartRead ( + IN UINTN UartBase, + OUT UINT8 *Buffer, + IN UINTN NumberOfBytes + ) +{ + UINTN Count; + + for (Count = 0; Count < NumberOfBytes; Count++, Buffer++) { + while ((MmioRead32 (UartBase + UARTFR) & UART_RX_EMPTY_FLAG_MASK) != 0); + *Buffer = MmioRead8 (UartBase + UARTDR); + } + + return NumberOfBytes; +} + +/** + Check to see if any data is available to be read from the debug device. + + @retval EFI_SUCCESS At least one byte of data is available to be read + @retval EFI_NOT_READY No data is available to be read + @retval EFI_DEVICE_ERROR The serial device is not functioning properly + +**/ +BOOLEAN +EFIAPI +PL011UartPoll ( + IN UINTN UartBase + ) +{ + return ((MmioRead32 (UartBase + UARTFR) & UART_RX_EMPTY_FLAG_MASK) == 0); +} diff --git a/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.inf b/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.inf new file mode 100644 index 0000000000..618c833727 --- /dev/null +++ b/ArmPlatformPkg/Drivers/PL011Uart/PL011Uart.inf @@ -0,0 +1,35 @@ +#/** @file +# +# Component discription file for NorFlashDxe module +# +# Copyright (c) 2011, 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 +# which accompanies this distribution. The full text of the license may be found at +# http://opensource.org/licenses/bsd-license.php +# +# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, +# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. +# +#**/ + +[Defines] + INF_VERSION = 0x00010005 + BASE_NAME = PL011Uart + FILE_GUID = 4ec8b120-8307-11e0-bc91-0002a5d5c51b + MODULE_TYPE = BASE + VERSION_STRING = 1.0 + LIBRARY_CLASS = PL011UartLib + +[Sources.common] + PL011Uart.c + +[LibraryClasses] + IoLib + +[Packages] + MdePkg/MdePkg.dec +# MdeModulePkg/MdeModulePkg.dec + ArmPlatformPkg/ArmPlatformPkg.dec + +[Pcd] |