mirror of https://github.com/acidanthera/audk.git
119 lines
2.5 KiB
C
119 lines
2.5 KiB
C
/** @file
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Basic serial IO abstaction for GDB
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Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <Uefi.h>
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#include <Library/GdbSerialLib.h>
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#include <Library/PcdLib.h>
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#include <Library/IoLib.h>
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#include <Drivers/PL011Uart.h>
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RETURN_STATUS
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EFIAPI
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GdbSerialLibConstructor (
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VOID
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)
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{
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return GdbSerialInit (115200, 0, 8, 1);
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}
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RETURN_STATUS
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EFIAPI
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GdbSerialInit (
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IN UINT64 BaudRate,
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IN UINT8 Parity,
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IN UINT8 DataBits,
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IN UINT8 StopBits
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)
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{
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if ((Parity != 0) || (DataBits != 8) || (StopBits != 1)) {
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return RETURN_UNSUPPORTED;
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}
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if (BaudRate != 115200) {
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// Could add support for different Baud rates....
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return RETURN_UNSUPPORTED;
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}
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UINT32 Base = PcdGet32 (PcdGdbUartBase);
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// initialize baud rate generator to 115200 based on EB clock REFCLK24MHZ
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MmioWrite32 (Base + UARTIBRD, UART_115200_IDIV);
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MmioWrite32 (Base + UARTFBRD, UART_115200_FDIV);
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// no parity, 1 stop, no fifo, 8 data bits
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MmioWrite32 (Base + UARTLCR_H, 0x60);
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// clear any pending errors
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MmioWrite32 (Base + UARTECR, 0);
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// enable tx, rx, and uart overall
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MmioWrite32 (Base + UARTCR, 0x301);
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return RETURN_SUCCESS;
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}
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BOOLEAN
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EFIAPI
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GdbIsCharAvailable (
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VOID
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)
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{
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UINT32 FR = PcdGet32 (PcdGdbUartBase) + UARTFR;
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if ((MmioRead32 (FR) & UART_RX_EMPTY_FLAG_MASK) == 0) {
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return TRUE;
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} else {
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return FALSE;
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}
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}
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CHAR8
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EFIAPI
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GdbGetChar (
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VOID
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)
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{
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UINT32 FR = PcdGet32 (PcdGdbUartBase) + UARTFR;
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UINT32 DR = PcdGet32 (PcdGdbUartBase) + UARTDR;
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while ((MmioRead32 (FR) & UART_RX_EMPTY_FLAG_MASK) == 0);
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return MmioRead8 (DR);
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}
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VOID
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EFIAPI
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GdbPutChar (
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IN CHAR8 Char
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)
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{
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UINT32 FR = PcdGet32 (PcdGdbUartBase) + UARTFR;
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UINT32 DR = PcdGet32 (PcdGdbUartBase) + UARTDR;
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while ((MmioRead32 (FR) & UART_TX_EMPTY_FLAG_MASK) != 0);
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MmioWrite8 (DR, Char);
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return;
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}
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VOID
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GdbPutString (
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IN CHAR8 *String
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)
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{
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while (*String != '\0') {
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GdbPutChar (*String);
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String++;
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}
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}
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