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484 lines
13 KiB
C
484 lines
13 KiB
C
/** @file
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UART Serial Port library functions
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Base.h>
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#include <Library/IoLib.h>
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#include <Library/SerialPortLib.h>
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//---------------------------------------------
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// UART Register Offsets
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//---------------------------------------------
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#define BAUD_LOW_OFFSET 0x00
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#define BAUD_HIGH_OFFSET 0x01
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#define IER_OFFSET 0x01
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#define LCR_SHADOW_OFFSET 0x01
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#define FCR_SHADOW_OFFSET 0x02
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#define IR_CONTROL_OFFSET 0x02
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#define FCR_OFFSET 0x02
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#define EIR_OFFSET 0x02
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#define BSR_OFFSET 0x03
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#define LCR_OFFSET 0x03
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#define MCR_OFFSET 0x04
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#define LSR_OFFSET 0x05
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#define MSR_OFFSET 0x06
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//---------------------------------------------
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// UART Register Bit Defines
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//---------------------------------------------
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#define LSR_TXRDY 0x20
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#define LSR_RXDA 0x01
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#define DLAB 0x01
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#define MCR_DTRC 0x01
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#define MCR_RTS 0x02
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#define MSR_CTS 0x10
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#define MSR_DSR 0x20
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#define MSR_RI 0x40
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#define MSR_DCD 0x80
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//---------------------------------------------
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// UART Settings
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//---------------------------------------------
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UINT16 gUartBase = 0x3F8;
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UINTN gBps = 115200;
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UINT8 gData = 8;
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UINT8 gStop = 1;
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UINT8 gParity = 0;
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UINT8 gBreakSet = 0;
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/**
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Initialize the serial device hardware.
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If no initialization is required, then return RETURN_SUCCESS.
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If the serial device was successfully initialized, then return RETURN_SUCCESS.
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If the serial device could not be initialized, then return RETURN_DEVICE_ERROR.
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@retval RETURN_SUCCESS The serial device was initialized.
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@retval RETURN_DEVICE_ERROR The serail device could not be initialized.
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**/
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RETURN_STATUS
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EFIAPI
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SerialPortInitialize (
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VOID
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)
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{
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UINTN Divisor;
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UINT8 OutputData;
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UINT8 Data;
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//
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// Map 5..8 to 0..3
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//
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Data = (UINT8) (gData - (UINT8) 5);
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//
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// Calculate divisor for baud generator
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//
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Divisor = 115200 / gBps;
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//
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// Set communications format
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//
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OutputData = (UINT8) ((DLAB << 7) | (gBreakSet << 6) | (gParity << 3) | (gStop << 2) | Data);
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IoWrite8 (gUartBase + LCR_OFFSET, OutputData);
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//
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// Configure baud rate
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//
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IoWrite8 (gUartBase + BAUD_HIGH_OFFSET, (UINT8) (Divisor >> 8));
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IoWrite8 (gUartBase + BAUD_LOW_OFFSET, (UINT8) (Divisor & 0xff));
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//
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// Switch back to bank 0
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//
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OutputData = (UINT8) ( (gBreakSet << 6) | (gParity << 3) | (gStop << 2) | Data);
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IoWrite8 (gUartBase + LCR_OFFSET, OutputData);
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return RETURN_SUCCESS;
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}
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/**
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Write data from buffer to serial device.
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Writes NumberOfBytes data bytes from Buffer to the serial device.
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The number of bytes actually written to the serial device is returned.
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If the return value is less than NumberOfBytes, then the write operation failed.
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If Buffer is NULL, then ASSERT().
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If NumberOfBytes is zero, then return 0.
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@param Buffer Pointer to the data buffer to be written.
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@param NumberOfBytes Number of bytes to written to the serial device.
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@retval 0 NumberOfBytes is 0.
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@retval >0 The number of bytes written to the serial device.
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If this value is less than NumberOfBytes, then the write operation failed.
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**/
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UINTN
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EFIAPI
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SerialPortWrite (
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IN UINT8 *Buffer,
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IN UINTN NumberOfBytes
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)
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{
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UINTN Result;
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UINT8 Data;
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if (Buffer == NULL) {
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return 0;
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}
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Result = NumberOfBytes;
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while ((NumberOfBytes--) != 0) {
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//
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// Wait for the serail port to be ready.
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//
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do {
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Data = IoRead8 ((UINT16) gUartBase + LSR_OFFSET);
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} while ((Data & LSR_TXRDY) == 0);
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IoWrite8 ((UINT16) gUartBase, *Buffer++);
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}
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return Result;
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}
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/**
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Reads data from a serial device into a buffer.
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@param Buffer Pointer to the data buffer to store the data read from the serial device.
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@param NumberOfBytes Number of bytes to read from the serial device.
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@retval 0 NumberOfBytes is 0.
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@retval >0 The number of bytes read from the serial device.
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If this value is less than NumberOfBytes, then the read operation failed.
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**/
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UINTN
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EFIAPI
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SerialPortRead (
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OUT UINT8 *Buffer,
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IN UINTN NumberOfBytes
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)
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{
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UINTN Result;
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UINT8 Data;
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if (NULL == Buffer) {
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return 0;
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}
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Result = NumberOfBytes;
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while ((NumberOfBytes--) != 0) {
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//
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// Wait for the serail port to be ready.
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//
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do {
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Data = IoRead8 ((UINT16) gUartBase + LSR_OFFSET);
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} while ((Data & LSR_RXDA) == 0);
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*Buffer++ = IoRead8 ((UINT16) gUartBase);
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}
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return Result;
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}
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/**
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Polls a serial device to see if there is any data waiting to be read.
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Polls aserial device to see if there is any data waiting to be read.
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If there is data waiting to be read from the serial device, then TRUE is returned.
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If there is no data waiting to be read from the serial device, then FALSE is returned.
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@retval TRUE Data is waiting to be read from the serial device.
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@retval FALSE There is no data waiting to be read from the serial device.
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**/
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BOOLEAN
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EFIAPI
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SerialPortPoll (
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VOID
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)
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{
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UINT8 Data;
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//
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// Read the serial port status.
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//
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Data = IoRead8 ((UINT16) gUartBase + LSR_OFFSET);
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return (BOOLEAN) ((Data & LSR_RXDA) != 0);
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}
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/**
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Sets the control bits on a serial device.
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@param Control Sets the bits of Control that are settable.
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@retval RETURN_SUCCESS The new control bits were set on the serial device.
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@retval RETURN_UNSUPPORTED The serial device does not support this operation.
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@retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
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**/
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RETURN_STATUS
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EFIAPI
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SerialPortSetControl (
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IN UINT32 Control
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)
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{
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UINT8 Mcr;
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//
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// First determine the parameter is invalid.
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//
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if ((Control & (~(EFI_SERIAL_REQUEST_TO_SEND | EFI_SERIAL_DATA_TERMINAL_READY))) != 0) {
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return RETURN_UNSUPPORTED;
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}
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//
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// Read the Modem Control Register.
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//
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Mcr = IoRead8 ((UINT16) gUartBase + MCR_OFFSET);
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Mcr &= (~(MCR_DTRC | MCR_RTS));
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if ((Control & EFI_SERIAL_DATA_TERMINAL_READY) == EFI_SERIAL_DATA_TERMINAL_READY) {
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Mcr |= MCR_DTRC;
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}
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if ((Control & EFI_SERIAL_REQUEST_TO_SEND) == EFI_SERIAL_REQUEST_TO_SEND) {
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Mcr |= MCR_RTS;
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}
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//
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// Write the Modem Control Register.
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//
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IoWrite8 ((UINT16) gUartBase + MCR_OFFSET, Mcr);
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return RETURN_SUCCESS;
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}
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/**
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Retrieve the status of the control bits on a serial device.
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@param Control A pointer to return the current control signals from the serial device.
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@retval RETURN_SUCCESS The control bits were read from the serial device.
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@retval RETURN_UNSUPPORTED The serial device does not support this operation.
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@retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
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**/
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RETURN_STATUS
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EFIAPI
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SerialPortGetControl (
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OUT UINT32 *Control
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)
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{
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UINT8 Msr;
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UINT8 Mcr;
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UINT8 Lsr;
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*Control = 0;
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//
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// Read the Modem Status Register.
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//
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Msr = IoRead8 ((UINT16) gUartBase + MSR_OFFSET);
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if ((Msr & MSR_CTS) == MSR_CTS) {
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*Control |= EFI_SERIAL_CLEAR_TO_SEND;
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}
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if ((Msr & MSR_DSR) == MSR_DSR) {
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*Control |= EFI_SERIAL_DATA_SET_READY;
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}
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if ((Msr & MSR_RI) == MSR_RI) {
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*Control |= EFI_SERIAL_RING_INDICATE;
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}
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if ((Msr & MSR_DCD) == MSR_DCD) {
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*Control |= EFI_SERIAL_CARRIER_DETECT;
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}
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//
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// Read the Modem Control Register.
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//
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Mcr = IoRead8 ((UINT16) gUartBase + MCR_OFFSET);
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if ((Mcr & MCR_DTRC) == MCR_DTRC) {
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*Control |= EFI_SERIAL_DATA_TERMINAL_READY;
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}
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if ((Mcr & MCR_RTS) == MCR_RTS) {
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*Control |= EFI_SERIAL_REQUEST_TO_SEND;
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}
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//
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// Read the Line Status Register.
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//
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Lsr = IoRead8 ((UINT16) gUartBase + LSR_OFFSET);
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if ((Lsr & LSR_TXRDY) == LSR_TXRDY) {
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*Control |= EFI_SERIAL_OUTPUT_BUFFER_EMPTY;
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}
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if ((Lsr & LSR_RXDA) == 0) {
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*Control |= EFI_SERIAL_INPUT_BUFFER_EMPTY;
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}
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return RETURN_SUCCESS;
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}
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/**
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Sets the baud rate, receive FIFO depth, transmit/receice time out, parity,
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data bits, and stop bits on a serial device.
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@param BaudRate The requested baud rate. A BaudRate value of 0 will use the
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device's default interface speed.
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On output, the value actually set.
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@param ReveiveFifoDepth The requested depth of the FIFO on the receive side of the
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serial interface. A ReceiveFifoDepth value of 0 will use
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the device's default FIFO depth.
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On output, the value actually set.
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@param Timeout The requested time out for a single character in microseconds.
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This timeout applies to both the transmit and receive side of the
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interface. A Timeout value of 0 will use the device's default time
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out value.
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On output, the value actually set.
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@param Parity The type of parity to use on this serial device. A Parity value of
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DefaultParity will use the device's default parity value.
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On output, the value actually set.
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@param DataBits The number of data bits to use on the serial device. A DataBits
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vaule of 0 will use the device's default data bit setting.
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On output, the value actually set.
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@param StopBits The number of stop bits to use on this serial device. A StopBits
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value of DefaultStopBits will use the device's default number of
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stop bits.
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On output, the value actually set.
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@retval RETURN_SUCCESS The new attributes were set on the serial device.
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@retval RETURN_UNSUPPORTED The serial device does not support this operation.
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@retval RETURN_INVALID_PARAMETER One or more of the attributes has an unsupported value.
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@retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
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**/
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RETURN_STATUS
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EFIAPI
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SerialPortSetAttributes (
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IN OUT UINT64 *BaudRate,
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IN OUT UINT32 *ReceiveFifoDepth,
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IN OUT UINT32 *Timeout,
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IN OUT EFI_PARITY_TYPE *Parity,
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IN OUT UINT8 *DataBits,
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IN OUT EFI_STOP_BITS_TYPE *StopBits
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)
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{
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UINTN Divisor;
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UINT8 OutputData;
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UINT8 LcrData;
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UINT8 LcrParity;
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UINT8 LcrStop;
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//
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// Check for default settings and fill in actual values.
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//
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if (*BaudRate == 0) {
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*BaudRate = gBps;
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}
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if (*DataBits == 0) {
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*DataBits = gData;
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}
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if (*Parity == DefaultParity) {
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*Parity = NoParity;
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}
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if (*StopBits == DefaultStopBits) {
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*StopBits = OneStopBit;
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}
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if ((*DataBits < 5) || (*DataBits > 8)) {
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return RETURN_INVALID_PARAMETER;
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}
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//
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// Map 5..8 to 0..3
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//
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LcrData = (UINT8) (*DataBits - (UINT8) 5);
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switch (*Parity) {
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case NoParity:
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LcrParity = 0;
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break;
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case EvenParity:
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LcrParity = 3;
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break;
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case OddParity:
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LcrParity = 1;
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break;
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case SpaceParity:
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LcrParity = 7;
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break;
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case MarkParity:
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LcrParity = 5;
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break;
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default:
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return RETURN_INVALID_PARAMETER;
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}
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switch (*StopBits) {
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case OneStopBit:
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LcrStop = 0;
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break;
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case OneFiveStopBits:
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case TwoStopBits:
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LcrStop = 1;
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break;
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default:
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return RETURN_INVALID_PARAMETER;
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}
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//
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// Calculate divisor for baud generator
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//
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Divisor = 115200 / (UINTN) *BaudRate;
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//
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// Set communications format
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//
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OutputData = (UINT8) ((DLAB << 7) | (gBreakSet << 6) | (LcrParity << 3) | (LcrStop << 2) | LcrData);
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IoWrite8 (gUartBase + LCR_OFFSET, OutputData);
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//
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// Configure baud rate
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//
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IoWrite8 (gUartBase + BAUD_HIGH_OFFSET, (UINT8) (Divisor >> 8));
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IoWrite8 (gUartBase + BAUD_LOW_OFFSET, (UINT8) (Divisor & 0xff));
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//
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// Switch back to bank 0
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//
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OutputData = (UINT8) ((gBreakSet << 6) | (LcrParity << 3) | (LcrStop << 2) | LcrData);
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IoWrite8 (gUartBase + LCR_OFFSET, OutputData);
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return RETURN_SUCCESS;
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}
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