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/** @file
Serial I/O Port library functions with no library constructor/destructor
Copyright (c) 2008 - 2009, 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 <Base.h>
#include <Library/DebugLib.h>
#include <Library/SerialPortLib.h>
#include <Library/SerialPortExtLib.h>
#include <Library/PcdLib.h>
#include <Library/IoLib.h>
#include <Library/OmapLib.h>
#include <Omap4430/Omap4430.h>
/*
Programmed hardware of Serial port.
@return Always return EFI_UNSUPPORTED.
**/
RETURN_STATUS
EFIAPI
SerialPortInitialize (
VOID
)
{
UINTN Uart = PcdGet32(PcdOmap44xxConsoleUart);
UINT32 UartBaseAddress = UartBase(Uart);
// Configure UART3 pads
MmioAnd32(0x4A100144, ~0x70007);
// Enable UART3 clocks
MmioOr32(0x4A009550, 0x2);
// Set MODE_SELECT=DISABLE before trying to initialize or modify DLL, DLH registers.
MmioWrite32 (UartBaseAddress + UART_MDR1_REG, UART_MDR1_MODE_SELECT_DISABLE);
// Put device in configuration mode.
MmioWrite32 (UartBaseAddress + UART_LCR_REG, UART_LCR_DIV_EN_ENABLE);
// Programmable divisor N = 48Mhz/16/115200 = 26
MmioWrite32 (UartBaseAddress + UART_DLL_REG, 3000000 / PcdGet64 (PcdUartDefaultBaudRate)); // low divisor
MmioWrite32 (UartBaseAddress + UART_DLH_REG, 0); // high divisor
// Enter into UART operational mode.
MmioWrite32 (UartBaseAddress + UART_LCR_REG, UART_LCR_DIV_EN_DISABLE | UART_LCR_CHAR_LENGTH_8);
// Force DTR and RTS output to active
MmioWrite32 (UartBaseAddress + UART_MCR_REG, UART_MCR_RTS_FORCE_ACTIVE | UART_MCR_DTR_FORCE_ACTIVE);
// Clear & enable fifos
MmioWrite32 (UartBaseAddress + UART_FCR_REG, UART_FCR_TX_FIFO_CLEAR | UART_FCR_RX_FIFO_CLEAR | UART_FCR_FIFO_ENABLE);
// Restore MODE_SELECT
MmioWrite32 (UartBaseAddress + UART_MDR1_REG, UART_MDR1_MODE_SELECT_UART_16X);
return RETURN_SUCCESS;
}
/**
Write data to serial device.
@param Buffer Point of data buffer which need to be writed.
@param NumberOfBytes Number of output bytes which are cached in Buffer.
@retval 0 Write data failed.
@retval !0 Actual number of bytes writed to serial device.
**/
UINTN
EFIAPI
SerialPortWrite (
IN UINT8 *Buffer,
IN UINTN NumberOfBytes
)
{
UINT32 LSR = UartBase(PcdGet32(PcdOmap44xxConsoleUart)) + UART_LSR_REG;
UINT32 THR = UartBase(PcdGet32(PcdOmap44xxConsoleUart)) + UART_THR_REG;
UINTN Count;
for (Count = 0; Count < NumberOfBytes; Count++, Buffer++) {
while ((MmioRead8(LSR) & UART_LSR_TX_FIFO_E_MASK) == UART_LSR_TX_FIFO_E_NOT_EMPTY);
MmioWrite8(THR, *Buffer);
}
return NumberOfBytes;
}
/**
Read data from serial device and save the datas in buffer.
@param Buffer Point of data buffer which need to be writed.
@param NumberOfBytes Number of output bytes which are cached in Buffer.
@retval 0 Read data failed.
@retval !0 Aactual number of bytes read from serial device.
**/
UINTN
EFIAPI
SerialPortRead (
OUT UINT8 *Buffer,
IN UINTN NumberOfBytes
)
{
UINT32 LSR = UartBase(PcdGet32(PcdOmap44xxConsoleUart)) + UART_LSR_REG;
UINT32 RBR = UartBase(PcdGet32(PcdOmap44xxConsoleUart)) + UART_RBR_REG;
UINTN Count;
for (Count = 0; Count < NumberOfBytes; Count++, Buffer++) {
while ((MmioRead8(LSR) & UART_LSR_RX_FIFO_E_MASK) == UART_LSR_RX_FIFO_E_EMPTY);
*Buffer = MmioRead8(RBR);
}
return NumberOfBytes;
}
/**
Check to see if any data is avaiable to be read from the debug device.
@retval EFI_SUCCESS At least one byte of data is avaiable to be read
@retval EFI_NOT_READY No data is avaiable to be read
@retval EFI_DEVICE_ERROR The serial device is not functioning properly
**/
BOOLEAN
EFIAPI
SerialPortPoll (
VOID
)
{
UINT32 LSR = UartBase(PcdGet32(PcdOmap44xxConsoleUart)) + UART_LSR_REG;
if ((MmioRead8(LSR) & UART_LSR_RX_FIFO_E_MASK) == UART_LSR_RX_FIFO_E_NOT_EMPTY) {
return TRUE;
} else {
return FALSE;
}
}
/**
Set the serial device control bits.
@return Always return EFI_UNSUPPORTED.
**/
RETURN_STATUS
EFIAPI
SerialPortSetControl (
IN UINT32 Control
)
{
return RETURN_SUCCESS;
}
/**
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 RETURN_SUCCESS;
}
/**
Set the serial device attributes.
@return Always return EFI_UNSUPPORTED.
**/
RETURN_STATUS
EFIAPI
SerialPortSetAttributes (
IN UINT64 BaudRate,
IN UINT32 ReceiveFifoDepth,
IN UINT32 Timeout,
IN EFI_PARITY_TYPE Parity,
IN UINT8 DataBits,
IN EFI_STOP_BITS_TYPE StopBits
)
{
return RETURN_SUCCESS;
}
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