mirror of https://github.com/acidanthera/audk.git
272 lines
9.0 KiB
C
272 lines
9.0 KiB
C
/** @file
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Serial I/O Port library functions with base address discovered from FDT
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Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
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Copyright (c) 2012 - 2013, ARM Ltd. All rights reserved.<BR>
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Copyright (c) 2014, Linaro Ltd. All rights reserved.<BR>
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Copyright (c) 2015, Intel Corporation. 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 <Base.h>
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#include <Library/PcdLib.h>
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#include <Library/SerialPortLib.h>
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#include <libfdt.h>
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#include <Drivers/PL011Uart.h>
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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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//
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// This SerialPortInitialize() function is completely empty, for a number of
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// reasons:
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// - if we are executing from flash, it is hard to keep state (i.e., store the
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// discovered base address in a global), and the most robust way to deal
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// with this is to discover the base address at every Write ();
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// - calls to the Write() function in this module may be issued before this
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// initialization function is called: this is not a problem when the base
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// address of the UART is hardcoded, and only the baud rate may be wrong,
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// but if we don't know the base address yet, we may be poking into memory
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// that does not tolerate being poked into;
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// - SEC and PEI phases produce debug output only, so with debug disabled, no
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// initialization (or device tree parsing) is performed at all.
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//
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// Note that this means that on *every* Write () call, the device tree will be
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// parsed and the UART re-initialized. However, this is a small price to pay
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// for having serial debug output on a UART with no fixed base address.
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//
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return RETURN_SUCCESS;
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}
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STATIC
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UINT64
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SerialPortGetBaseAddress (
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VOID
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)
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{
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UINT64 BaudRate;
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UINT32 ReceiveFifoDepth;
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EFI_PARITY_TYPE Parity;
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UINT8 DataBits;
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EFI_STOP_BITS_TYPE StopBits;
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VOID *DeviceTreeBase;
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INT32 Node, Prev;
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INT32 Len;
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CONST CHAR8 *Compatible;
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CONST CHAR8 *CompatibleItem;
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CONST UINT64 *RegProperty;
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UINTN UartBase;
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RETURN_STATUS Status;
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DeviceTreeBase = (VOID *)(UINTN)FixedPcdGet64 (PcdDeviceTreeInitialBaseAddress);
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if ((DeviceTreeBase == NULL) || (fdt_check_header (DeviceTreeBase) != 0)) {
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return 0;
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}
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//
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// Enumerate all FDT nodes looking for a PL011 and capture its base address
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//
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for (Prev = 0;; Prev = Node) {
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Node = fdt_next_node (DeviceTreeBase, Prev, NULL);
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if (Node < 0) {
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break;
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}
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Compatible = fdt_getprop (DeviceTreeBase, Node, "compatible", &Len);
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if (Compatible == NULL) {
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continue;
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}
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//
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// Iterate over the NULL-separated items in the compatible string
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//
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for (CompatibleItem = Compatible; CompatibleItem < Compatible + Len;
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CompatibleItem += 1 + AsciiStrLen (CompatibleItem)) {
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if (AsciiStrCmp (CompatibleItem, "arm,pl011") == 0) {
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RegProperty = fdt_getprop (DeviceTreeBase, Node, "reg", &Len);
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if (Len != 16) {
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return 0;
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}
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UartBase = (UINTN)fdt64_to_cpu (ReadUnaligned64 (RegProperty));
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BaudRate = (UINTN)FixedPcdGet64 (PcdUartDefaultBaudRate);
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ReceiveFifoDepth = 0; // Use the default value for Fifo depth
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Parity = (EFI_PARITY_TYPE)FixedPcdGet8 (PcdUartDefaultParity);
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DataBits = FixedPcdGet8 (PcdUartDefaultDataBits);
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StopBits = (EFI_STOP_BITS_TYPE) FixedPcdGet8 (PcdUartDefaultStopBits);
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Status = PL011UartInitializePort (
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UartBase,
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&BaudRate, &ReceiveFifoDepth, &Parity, &DataBits, &StopBits);
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if (!EFI_ERROR (Status)) {
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return UartBase;
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}
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}
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}
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}
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return 0;
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}
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/**
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Write data to serial device.
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@param Buffer Point of data buffer which need to be written.
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@param NumberOfBytes Number of output bytes which are cached in Buffer.
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@retval 0 Write data failed.
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@retval !0 Actual number of bytes written to serial device.
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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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UINT64 SerialRegisterBase;
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SerialRegisterBase = SerialPortGetBaseAddress ();
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if (SerialRegisterBase != 0) {
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return PL011UartWrite ((UINTN)SerialRegisterBase, Buffer, NumberOfBytes);
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}
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return 0;
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}
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/**
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Read data from serial device and save the data in buffer.
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@param Buffer Point of data buffer which need to be written.
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@param NumberOfBytes Size of Buffer[].
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@retval 0 Read data failed.
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@retval !0 Actual number of bytes read from serial device.
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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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return 0;
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}
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/**
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Check to see if any data is available to be read from the debug device.
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@retval TRUE At least one byte of data is available to be read
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@retval FALSE No data is available to be read
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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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return FALSE;
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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[in] 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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return RETURN_UNSUPPORTED;
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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[out] 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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return RETURN_UNSUPPORTED;
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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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return RETURN_UNSUPPORTED;
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}
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