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/** @file
Basic serial IO abstaction for GDB
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 <Uefi.h>
#include <Library/GdbSerialLib.h>
#include <Library/PcdLib.h>
#include <Library/IoLib.h>
#include <ArmEb/ArmEb.h>
RETURN_STATUS
EFIAPI
GdbSerialLibConstructor (
VOID
)
{
return GdbSerialInit (115200, 0, 8, 1);
}
RETURN_STATUS
EFIAPI
GdbSerialInit (
IN UINT64 BaudRate,
IN UINT8 Parity,
IN UINT8 DataBits,
IN UINT8 StopBits
)
{
if ((Parity != 0) || (DataBits != 8) || (StopBits != 1)) {
return RETURN_UNSUPPORTED;
}
if (BaudRate != 115200) {
// Could add support for different Baud rates....
return RETURN_UNSUPPORTED;
}
UINT32 Base = PcdGet32 (PcdGdbUartBase);
// initialize baud rate generator to 115200 based on EB clock REFCLK24MHZ
MmioWrite32 (Base + UARTIBRD, UART_115200_IDIV);
MmioWrite32 (Base + UARTFBRD, UART_115200_FDIV);
// no parity, 1 stop, no fifo, 8 data bits
MmioWrite32 (Base + UARTLCR_H, 0x60);
// clear any pending errors
MmioWrite32 (Base + UARTECR, 0);
// enable tx, rx, and uart overall
MmioWrite32 (Base + UARTCR, 0x301);
return RETURN_SUCCESS;
}
BOOLEAN
EFIAPI
GdbIsCharAvailable (
VOID
)
{
UINT32 FR = PcdGet32 (PcdGdbUartBase) + UARTFR;
if ((MmioRead32 (FR) & UART_RX_EMPTY_FLAG_MASK) == 0) {
return TRUE;
} else {
return FALSE;
}
}
CHAR8
EFIAPI
GdbGetChar (
VOID
)
{
UINT32 FR = PcdGet32 (PcdGdbUartBase) + UARTFR;
UINT32 DR = PcdGet32 (PcdGdbUartBase) + UARTDR;
while ((MmioRead32 (FR) & UART_RX_EMPTY_FLAG_MASK) == 0);
return MmioRead8 (DR);
}
VOID
EFIAPI
GdbPutChar (
IN CHAR8 Char
)
{
UINT32 FR = PcdGet32 (PcdGdbUartBase) + UARTFR;
UINT32 DR = PcdGet32 (PcdGdbUartBase) + UARTDR;
while ((MmioRead32 (FR) & UART_TX_EMPTY_FLAG_MASK) != 0);
MmioWrite8 (DR, Char);
return;
}
VOID
GdbPutString (
IN CHAR8 *String
)
{
while (*String != '\0') {
GdbPutChar (*String);
String++;
}
}
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