diff options
Diffstat (limited to 'Silicon/Hisilicon/Library/Dw8250SerialPortLib/Dw8250SerialPortLib.c')
| -rw-r--r-- | Silicon/Hisilicon/Library/Dw8250SerialPortLib/Dw8250SerialPortLib.c | 302 |
1 files changed, 302 insertions, 0 deletions
diff --git a/Silicon/Hisilicon/Library/Dw8250SerialPortLib/Dw8250SerialPortLib.c b/Silicon/Hisilicon/Library/Dw8250SerialPortLib/Dw8250SerialPortLib.c new file mode 100644 index 0000000000..ce70ca5ee1 --- /dev/null +++ b/Silicon/Hisilicon/Library/Dw8250SerialPortLib/Dw8250SerialPortLib.c @@ -0,0 +1,302 @@ +/** @file
+ UART Serial Port library functions
+
+ Copyright (c) 2006 - 2009, Intel Corporation
+ Copyright (c) 2015 - 2016, Hisilicon Limited. All rights reserved.
+ Copyright (c) 2015 - 2016, Linaro Limited. All rights reserved.
+ All rights reserved. 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.
+
+ Based on the files under ArmPlatformPkg/Library/PL011SerialPortLib/
+**/
+#include <Uefi.h>
+#include <Library/PcdLib.h>
+#include <Library/SerialPortLib.h>
+#include <Library/IoLib.h>
+#include <Protocol/SerialIo.h>
+
+#include "Dw8250SerialPortLib.h"
+
+
+/**
+ Initialize the serial device hardware.
+
+ If no initialization is required, then return RETURN_SUCCESS.
+ If the serial device was successfuly initialized, then return RETURN_SUCCESS.
+ If the serial device could not be initialized, then return RETURN_DEVICE_ERROR.
+
+ @retval RETURN_SUCCESS The serial device was initialized.
+ @retval RETURN_DEVICE_ERROR The serail device could not be initialized.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortInitialize (
+ VOID
+ )
+{
+ UINT32 ulUartClkFreq;
+
+ MmioWrite8 (UART_LCR_REG, UART_LCR_DLS8);
+ MmioWrite8 (UART_FCR_REG, UART_FCR_EN | UART_FCR_RXCLR | UART_FCR_TXCLR);
+ MmioWrite8 (UART_LCR_REG, UART_LCR_DLAB | UART_LCR_DLS8);
+
+ ulUartClkFreq = PcdGet32(PcdUartClkInHz);
+
+ MmioWrite8 (UART_DLL_REG, (ulUartClkFreq / (16 * (UINT32)BAUDRATE) ) & 0xff);
+ MmioWrite8 (UART_DLH_REG, ((ulUartClkFreq/ (16 * (UINT32)BAUDRATE) ) >> 8 ) & 0xff);
+ MmioWrite8 (UART_LCR_REG, UART_LCR_DLS8);
+ MmioWrite8 (UART_IEL_REG, 0x00);
+
+ return RETURN_SUCCESS;
+}
+
+
+/**
+ Write data from buffer to serial device.
+
+ Writes NumberOfBytes data bytes from Buffer to the serial device.
+ The number of bytes actually written to the serial device is returned.
+ If the return value is less than NumberOfBytes, then the write operation failed.
+
+ If Buffer is NULL, then ASSERT().
+
+ If NumberOfBytes is zero, then return 0.
+
+ @param Buffer Pointer to the data buffer to be written.
+ @param NumberOfBytes Number of bytes to written to the serial device.
+
+ @retval 0 NumberOfBytes is 0.
+ @retval >0 The number of bytes written to the serial device.
+ If this value is less than NumberOfBytes, then the read operation failed.
+
+**/
+UINTN
+EFIAPI
+SerialPortWrite (
+ IN UINT8 *Buffer,
+ IN UINTN NumberOfBytes
+)
+{
+ UINTN Result;
+
+ if (NULL == Buffer) {
+ return 0;
+ }
+
+ Result = NumberOfBytes;
+
+ while (NumberOfBytes--) {
+
+ SerialPortWriteChar(*Buffer);
+ Buffer++;
+ }
+
+ return Result;
+}
+
+
+/**
+ Reads data from a serial device into a buffer.
+
+ @param Buffer Pointer to the data buffer to store the data read from the serial device.
+ @param NumberOfBytes Number of bytes to read from the serial device.
+
+ @retval 0 NumberOfBytes is 0.
+ @retval >0 The number of bytes read from the serial device.
+ If this value is less than NumberOfBytes, then the read operation failed.
+
+**/
+UINTN
+EFIAPI
+SerialPortRead (
+ OUT UINT8 *Buffer,
+ IN UINTN NumberOfBytes
+)
+{
+ UINTN Result;
+
+ if (NULL == Buffer) {
+ return 0;
+ }
+
+ Result = 0;
+
+ while (NumberOfBytes--) {
+ //
+ // Wait for the serail port to be ready.
+ //
+ *Buffer=SerialPortReadChar();
+ Buffer++ ;
+ Result++;
+ }
+
+ return Result;
+}
+
+/**
+ Polls a serial device to see if there is any data waiting to be read.
+
+ Polls aserial device to see if there is any data waiting to be read.
+ If there is data waiting to be read from the serial device, then TRUE is returned.
+ If there is no data waiting to be read from the serial device, then FALSE is returned.
+
+ @retval TRUE Data is waiting to be read from the serial device.
+ @retval FALSE There is no data waiting to be read from the serial device.
+
+**/
+BOOLEAN
+EFIAPI
+SerialPortPoll (
+ VOID
+ )
+{
+
+ return (BOOLEAN) ((MmioRead8 (UART_LSR_REG) & UART_LSR_DR) == UART_LSR_DR);
+
+}
+
+
+VOID SerialPortWriteChar(UINT8 scShowChar)
+{
+ UINT32 ulLoop = 0;
+
+ while(ulLoop < (UINT32)UART_SEND_DELAY)
+ {
+
+ if ((MmioRead8 (UART_USR_REG) & 0x02) == 0x02)
+ {
+ break;
+ }
+
+ ulLoop++;
+ }
+ MmioWrite8 (UART_THR_REG, (UINT8)scShowChar);
+
+ ulLoop = 0;
+ while(ulLoop < (UINT32)UART_SEND_DELAY)
+ {
+ if ((MmioRead8 (UART_USR_REG) & 0x04) == 0x04)
+ {
+ break;
+ }
+ ulLoop++;
+ }
+
+ return;
+}
+
+
+UINT8 SerialPortReadChar(VOID)
+{
+ UINT8 recvchar = 0;
+
+ while(1)
+ {
+ if ((MmioRead8 (UART_LSR_REG) & UART_LSR_DR) == UART_LSR_DR)
+ {
+ break;
+ }
+ }
+
+ recvchar = MmioRead8 (UART_RBR_REG);
+
+ return recvchar;
+}
+
+/**
+ Sets the baud rate, receive FIFO depth, transmit/receice time out, parity,
+ data bits, and stop bits on a serial device.
+
+ @param BaudRate The requested baud rate. A BaudRate value of 0 will use the
+ device's default interface speed.
+ On output, the value actually set.
+ @param ReveiveFifoDepth The requested depth of the FIFO on the receive side of the
+ serial interface. A ReceiveFifoDepth value of 0 will use
+ the device's default FIFO depth.
+ On output, the value actually set.
+ @param Timeout The requested time out for a single character in microseconds.
+ This timeout applies to both the transmit and receive side of the
+ interface. A Timeout value of 0 will use the device's default time
+ out value.
+ On output, the value actually set.
+ @param Parity The type of parity to use on this serial device. A Parity value of
+ DefaultParity will use the device's default parity value.
+ On output, the value actually set.
+ @param DataBits The number of data bits to use on the serial device. A DataBits
+ vaule of 0 will use the device's default data bit setting.
+ On output, the value actually set.
+ @param StopBits The number of stop bits to use on this serial device. A StopBits
+ value of DefaultStopBits will use the device's default number of
+ stop bits.
+ On output, the value actually set.
+
+ @retval RETURN_SUCCESS The new attributes were set on the serial device.
+ @retval RETURN_UNSUPPORTED The serial device does not support this operation.
+ @retval RETURN_INVALID_PARAMETER One or more of the attributes has an unsupported value.
+ @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortSetAttributes (
+ IN OUT UINT64 *BaudRate,
+ IN OUT UINT32 *ReceiveFifoDepth,
+ IN OUT UINT32 *Timeout,
+ IN OUT EFI_PARITY_TYPE *Parity,
+ IN OUT UINT8 *DataBits,
+ IN OUT EFI_STOP_BITS_TYPE *StopBits
+ )
+{
+ return RETURN_UNSUPPORTED;
+}
+
+/**
+ 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.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortSetControl (
+ IN UINT32 Control
+ )
+{
+ return EFI_UNSUPPORTED;
+}
+
+/**
+ 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.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortGetControl (
+ OUT UINT32 *Control
+ )
+{
+
+ if (SerialPortPoll ()) {
+ // If a character is pending don't set EFI_SERIAL_INPUT_BUFFER_EMPTY
+ *Control = EFI_SERIAL_OUTPUT_BUFFER_EMPTY;
+ } else {
+ *Control = EFI_SERIAL_INPUT_BUFFER_EMPTY | EFI_SERIAL_OUTPUT_BUFFER_EMPTY;
+ }
+ return EFI_SUCCESS;
+}
+
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