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/** @file
Copyright (c) 2006 - 2008, Intel Corporation
Copyright (c) 2018 Microsoft Corporation. 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.
**/
#include <Base.h>
#include <Library/BaseLib.h>
#include <Library/IoLib.h>
#include <Library/SerialPortLib.h>
#include "iMXUart.h"
/**
Initialize the serial device hardware.
If no initialization is required, then return RETURN_SUCCESS.
If the serial device was successfully 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 serial device could not be initialized.
**/
RETURN_STATUS
EFIAPI
SerialPortInitialize (
VOID
)
{
MX6UART_REGISTERS *UartBase;
UINT32 Data;
UartBase = (MX6UART_REGISTERS*)FixedPcdGet32 (PcdSerialRegisterBase);
Data = MmioRead32 ((UINTN)&UartBase->Ucr1);
if ((Data & MX6UART_UCR1_UARTEN) == 0) {
// UART should have been initialized by previous boot stage
return RETURN_DEVICE_ERROR;
}
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
)
{
MX6UART_REGISTERS *UartBase;
UINTN BytesSent;
UartBase = (MX6UART_REGISTERS*)FixedPcdGet32 (PcdSerialRegisterBase);
BytesSent = 0;
while (BytesSent < NumberOfBytes) {
// Check if FIFO is full and wait if it is.
while ((MmioRead32 ((UINTN)&UartBase->Uts) & MX6UART_UTS_TXFULL) != 0);
MmioWrite32 ((UINTN)&UartBase->Txd, Buffer[BytesSent]);
BytesSent++;
}
return BytesSent;
}
/**
Read data from serial device and save the datas in buffer.
Reads NumberOfBytes data bytes from a serial device into the buffer
specified by Buffer. The number of bytes actually read is returned.
If the return value is less than NumberOfBytes, then the rest operation failed.
If Buffer is NULL, then ASSERT().
If NumberOfBytes is zero, then return 0.
@param Buffer Pointer to the data buffer to store the data read
from the serial device.
@param NumberOfBytes Number of bytes which will be read.
@retval 0 Read data failed, No data is to be read.
@retval >0 Actual number of bytes read from serial device.
**/
UINTN
EFIAPI
SerialPortRead (
OUT UINT8 *Buffer,
IN UINTN NumberOfBytes
)
{
MX6UART_REGISTERS *UartBase;
UINTN BytesRead;
UINT32 Data;
UartBase = (MX6UART_REGISTERS*)FixedPcdGet32 (PcdSerialRegisterBase);
BytesRead = 0;
while (BytesRead < NumberOfBytes) {
Data = MmioRead32 ((UINTN)&UartBase->Rxd);
if ((Data & MX6UART_RXD_CHARRDY) == 0) {
break;
}
Buffer[BytesRead] = (UINT8) (Data & MX6UART_RXD_RX_DATA_MASK);
BytesRead++;
}
return BytesRead;
}
/**
Polls a serial device to see if there is any data waiting to be read.
Polls a serial 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
)
{
MX6UART_REGISTERS *UartBase;
UINT32 Data;
UartBase = (MX6UART_REGISTERS*)FixedPcdGet32 (PcdSerialRegisterBase);
Data = MmioRead32 ((UINTN)&UartBase->Usr2);
return (Data & MX6UART_USR2_RDR) != 0;
}
/**
Sets the control bits on a serial device.
@param Control Sets the bits of Control that are settable.
@retval RETURN_UNSUPPORTED The serial device does not support this operation.
**/
RETURN_STATUS
EFIAPI
SerialPortSetControl (
IN UINT32 Control
)
{
return RETURN_UNSUPPORTED;
}
/**
Retrieve the status of the control bits on a serial device.
@param Control A pointer to return the current control signals
from the serial device.
@retval RETURN_UNSUPPORTED The serial device does not support this operation.
**/
RETURN_STATUS
EFIAPI
SerialPortGetControl (
OUT UINT32 *Control
)
{
return RETURN_UNSUPPORTED;
}
/**
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
timeout 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 value 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_UNSUPPORTED The serial device does not support this operation.
**/
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;
}
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