mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
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139 lines
3.8 KiB
C
139 lines
3.8 KiB
C
/** @file
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Early Platform Hook Library instance for 16550 Uart.
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Copyright (c) 2020, ARM Ltd. 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 <Uefi.h>
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#include <Pi/PiBootMode.h>
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#include <Pi/PiHob.h>
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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#include <Library/HobLib.h>
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#include <Library/PcdLib.h>
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#include <Library/PlatformHookLib.h>
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#include <libfdt.h>
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/** Get the UART base address of the console serial-port from the DT.
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This function fetches the node referenced in the "stdout-path"
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property of the "chosen" node and returns the base address of
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the console UART.
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@param [in] Fdt Pointer to a Flattened Device Tree (Fdt).
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@param [out] SerialConsoleAddress If success, contains the base address
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of the console serial-port.
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@retval EFI_SUCCESS The function completed successfully.
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@retval EFI_NOT_FOUND Console serial-port info not found in DT.
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@retval EFI_INVALID_PARAMETER Invalid parameter.
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**/
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STATIC
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EFI_STATUS
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EFIAPI
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GetSerialConsolePortAddress (
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IN CONST VOID *Fdt,
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OUT UINT64 *SerialConsoleAddress
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)
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{
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CONST CHAR8 *Prop;
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INT32 PropSize;
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CONST CHAR8 *Path;
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INT32 PathLen;
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INT32 ChosenNode;
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INT32 SerialConsoleNode;
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INT32 Len;
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CONST CHAR8 *NodeStatus;
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CONST UINT64 *RegProperty;
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if ((Fdt == NULL) || (fdt_check_header (Fdt) != 0)) {
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return EFI_INVALID_PARAMETER;
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}
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// The "chosen" node resides at the root of the DT. Fetch it.
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ChosenNode = fdt_path_offset (Fdt, "/chosen");
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if (ChosenNode < 0) {
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return EFI_NOT_FOUND;
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}
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Prop = fdt_getprop (Fdt, ChosenNode, "stdout-path", &PropSize);
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if (PropSize < 0) {
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return EFI_NOT_FOUND;
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}
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// Determine the actual path length, as a colon terminates the path.
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Path = ScanMem8 (Prop, ':', PropSize);
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if (Path == NULL) {
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PathLen = AsciiStrLen (Prop);
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} else {
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PathLen = Path - Prop;
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}
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// Aliases cannot start with a '/', so it must be the actual path.
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if (Prop[0] == '/') {
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SerialConsoleNode = fdt_path_offset_namelen (Fdt, Prop, PathLen);
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} else {
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// Lookup the alias, as this contains the actual path.
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Path = fdt_get_alias_namelen (Fdt, Prop, PathLen);
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if (Path == NULL) {
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return EFI_NOT_FOUND;
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}
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SerialConsoleNode = fdt_path_offset (Fdt, Path);
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}
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NodeStatus = fdt_getprop (Fdt, SerialConsoleNode, "status", &Len);
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if ((NodeStatus != NULL) && (AsciiStrCmp (NodeStatus, "okay") != 0)) {
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return EFI_NOT_FOUND;
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}
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RegProperty = fdt_getprop (Fdt, SerialConsoleNode, "reg", &Len);
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if (Len != 16) {
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return EFI_INVALID_PARAMETER;
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}
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*SerialConsoleAddress = fdt64_to_cpu (ReadUnaligned64 (RegProperty));
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return EFI_SUCCESS;
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}
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/** Platform hook to retrieve the 16550 UART base address from the platform
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Device tree and store it in PcdSerialRegisterBase.
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@retval RETURN_SUCCESS Success.
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@retval RETURN_INVALID_PARAMETER A parameter was invalid.
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@retval RETURN_NOT_FOUND Serial port information not found.
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**/
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RETURN_STATUS
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EFIAPI
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PlatformHookSerialPortInitialize (
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VOID
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)
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{
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RETURN_STATUS Status;
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VOID *DeviceTreeBase;
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UINT64 SerialConsoleAddress;
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if (PcdGet64 (PcdSerialRegisterBase) != 0) {
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return RETURN_SUCCESS;
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}
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DeviceTreeBase = (VOID *)(UINTN)PcdGet64 (PcdDeviceTreeInitialBaseAddress);
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if (DeviceTreeBase == NULL) {
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return RETURN_NOT_FOUND;
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}
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Status = GetSerialConsolePortAddress (DeviceTreeBase, &SerialConsoleAddress);
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if (RETURN_ERROR (Status)) {
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return Status;
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}
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return (EFI_STATUS)PcdSet64S (PcdSerialRegisterBase, SerialConsoleAddress);
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}
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