diff options
Diffstat (limited to 'Platform/BroxtonPlatformPkg/Common/Console/LpssUartSerialDxe/Serial.c')
| -rw-r--r-- | Platform/BroxtonPlatformPkg/Common/Console/LpssUartSerialDxe/Serial.c | 1811 |
1 files changed, 1811 insertions, 0 deletions
diff --git a/Platform/BroxtonPlatformPkg/Common/Console/LpssUartSerialDxe/Serial.c b/Platform/BroxtonPlatformPkg/Common/Console/LpssUartSerialDxe/Serial.c new file mode 100644 index 0000000000..fa6a2667e9 --- /dev/null +++ b/Platform/BroxtonPlatformPkg/Common/Console/LpssUartSerialDxe/Serial.c @@ -0,0 +1,1811 @@ +/** @file
+ Serial driver for standard UARTS on an ISA bus.
+
+ Copyright (c) 2006 - 2016, Intel Corporation. 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 "Serial.h"
+
+//
+// ISA Serial Driver Global Variables
+//
+EFI_DRIVER_BINDING_PROTOCOL gSerialControllerDriver = {
+ SerialControllerDriverSupported,
+ SerialControllerDriverStart,
+ SerialControllerDriverStop,
+ 0xa,
+ NULL,
+ NULL
+};
+
+
+SERIAL_DEV gSerialDevTempate = {
+ SERIAL_DEV_SIGNATURE,
+ NULL,
+ { // SerialIo
+ SERIAL_IO_INTERFACE_REVISION,
+ IsaSerialReset,
+ IsaSerialSetAttributes,
+ IsaSerialSetControl,
+ IsaSerialGetControl,
+ IsaSerialWrite,
+ IsaSerialRead,
+ NULL
+ },
+ { // SerialMode
+ SERIAL_PORT_SUPPORT_CONTROL_MASK,
+ SERIAL_PORT_DEFAULT_TIMEOUT,
+ 0,
+ SERIAL_PORT_DEFAULT_RECEIVE_FIFO_DEPTH,
+ 0,
+ 0,
+ 0
+ },
+ NULL,
+ NULL,
+ { // UartDevicePath
+ {
+ MESSAGING_DEVICE_PATH,
+ MSG_UART_DP,
+ {
+ (UINT8) (sizeof (UART_DEVICE_PATH)),
+ (UINT8) ((sizeof (UART_DEVICE_PATH)) >> 8)
+ }
+ },
+ 0,
+ 0,
+ 0,
+ 0,
+ 0
+ },
+ NULL,
+ 0, //BaseAddress
+ {
+ 0,
+ 0,
+ SERIAL_MAX_BUFFER_SIZE,
+ { 0 }
+ },
+ {
+ 0,
+ 0,
+ SERIAL_MAX_BUFFER_SIZE,
+ { 0 }
+ },
+ FALSE,
+ FALSE,
+ Uart16550A,
+ NULL
+};
+
+
+/**
+ Check the device path node whether it's the Flow Control node or not.
+
+ @param[in] FlowControl The device path node to be checked.
+
+ @retval TRUE It's the Flow Control node.
+ @retval FALSE It's not.
+
+**/
+BOOLEAN
+IsUartFlowControlNode (
+ IN UART_FLOW_CONTROL_DEVICE_PATH *FlowControl
+ )
+{
+ return (BOOLEAN) (
+ (DevicePathType (FlowControl) == MESSAGING_DEVICE_PATH) &&
+ (DevicePathSubType (FlowControl) == MSG_VENDOR_DP) &&
+ (CompareGuid (&FlowControl->Guid, &gEfiUartDevicePathGuid))
+ );
+}
+
+
+/**
+ Check the device path node whether it contains Flow Control node or not.
+
+ @param[in] DevicePath The device path to be checked.
+
+ @retval TRUE It contains the Flow Control node.
+ @retval FALSE It doesn't.
+
+**/
+BOOLEAN
+ContainsFlowControl (
+ IN EFI_DEVICE_PATH_PROTOCOL *DevicePath
+ )
+{
+ while (!IsDevicePathEnd (DevicePath)) {
+ if (IsUartFlowControlNode ((UART_FLOW_CONTROL_DEVICE_PATH *) DevicePath)) {
+ return TRUE;
+ }
+ DevicePath = NextDevicePathNode (DevicePath);
+ }
+
+ return FALSE;
+}
+
+
+/**
+ The user Entry Point for module IsaSerial. The user code starts with this function.
+
+ @param[in] ImageHandle The firmware allocated handle for the EFI image.
+ @param[in] SystemTable A pointer to the EFI System Table.
+
+ @retval EFI_SUCCESS The entry point is executed successfully.
+ @retval other Some error occurs when executing this entry point.
+
+**/
+EFI_STATUS
+EFIAPI
+InitializeIsaSerial (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ EFI_STATUS Status;
+
+ //
+ // Install driver model protocol(s).
+ //
+ Status = EfiLibInstallDriverBindingComponentName2 (
+ ImageHandle,
+ SystemTable,
+ &gSerialControllerDriver,
+ ImageHandle,
+ &gLpssUartSerialComponentName,
+ &gLpssUartSerialComponentName2
+ );
+ ASSERT_EFI_ERROR (Status);
+
+ return Status;
+}
+
+
+/**
+ Check to see if this driver supports the given controller
+
+ @param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
+ @param[in] Controller The handle of the controller to test.
+ @param[in] RemainingDevicePath A pointer to the remaining portion of a device path.
+
+ @retval EFI_SUCCESS This driver can support the given controller.
+
+**/
+EFI_STATUS
+EFIAPI
+SerialControllerDriverSupported (
+ IN EFI_DRIVER_BINDING_PROTOCOL *This,
+ IN EFI_HANDLE Controller,
+ IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
+ )
+
+{
+ EFI_STATUS Status;
+ EFI_DEVICE_PATH_PROTOCOL *ParentDevicePath;
+ EFI_ISA_IO_PROTOCOL *IsaIo;
+ UART_DEVICE_PATH *UartNode;
+ EFI_DEVICE_PATH_PROTOCOL *DevicePath;
+ UART_FLOW_CONTROL_DEVICE_PATH *FlowControlNode;
+ EFI_OPEN_PROTOCOL_INFORMATION_ENTRY *OpenInfoBuffer;
+ UINTN EntryCount;
+ UINTN Index;
+ BOOLEAN HasFlowControl;
+
+ //
+ // Check RemainingDevicePath validation
+ //
+ if (RemainingDevicePath != NULL) {
+ //
+ // Check if RemainingDevicePath is the End of Device Path Node,
+ // if yes, go on checking other conditions
+ //
+ if (!IsDevicePathEnd (RemainingDevicePath)) {
+ //
+ // If RemainingDevicePath isn't the End of Device Path Node,
+ // check its validation
+ //
+ Status = EFI_UNSUPPORTED;
+
+ UartNode = (UART_DEVICE_PATH *) RemainingDevicePath;
+ if (UartNode->Header.Type != MESSAGING_DEVICE_PATH ||
+ UartNode->Header.SubType != MSG_UART_DP ||
+ sizeof (UART_DEVICE_PATH) != DevicePathNodeLength ((EFI_DEVICE_PATH_PROTOCOL *) UartNode)
+ ) {
+ goto Error;
+ }
+
+ if (UartNode->BaudRate > SERIAL_PORT_MAX_BAUD_RATE) {
+ goto Error;
+ }
+
+ if (UartNode->Parity < NoParity || UartNode->Parity > SpaceParity) {
+ goto Error;
+ }
+
+ if (UartNode->DataBits < 5 || UartNode->DataBits > 8) {
+ goto Error;
+ }
+
+ if (UartNode->StopBits < OneStopBit || UartNode->StopBits > TwoStopBits) {
+ goto Error;
+ }
+
+ if ((UartNode->DataBits == 5) && (UartNode->StopBits == TwoStopBits)) {
+ goto Error;
+ }
+
+ if ((UartNode->DataBits >= 6) && (UartNode->DataBits <= 8) && (UartNode->StopBits == OneFiveStopBits)) {
+ goto Error;
+ }
+
+ FlowControlNode = (UART_FLOW_CONTROL_DEVICE_PATH *) NextDevicePathNode (UartNode);
+ if (IsUartFlowControlNode (FlowControlNode)) {
+ //
+ // If the second node is Flow Control Node,
+ // return error when it request other than hardware flow control.
+ //
+ if ((ReadUnaligned32 (&FlowControlNode->FlowControlMap) & ~UART_FLOW_CONTROL_HARDWARE) != 0) {
+ goto Error;
+ }
+ }
+ }
+ }
+
+ //
+ // Open the IO Abstraction(s) needed to perform the supported test
+ //
+ Status = gBS->OpenProtocol (
+ Controller,
+ &gEfiIsaIoProtocolGuid,
+ (VOID **) &IsaIo,
+ This->DriverBindingHandle,
+ Controller,
+ EFI_OPEN_PROTOCOL_BY_DRIVER
+ );
+ if (Status == EFI_ALREADY_STARTED) {
+ if (RemainingDevicePath == NULL || IsDevicePathEnd (RemainingDevicePath)) {
+ //
+ // If RemainingDevicePath is NULL or is the End of Device Path Node
+ //
+ return EFI_SUCCESS;
+ }
+ //
+ // When the driver has produced device path with flow control node but RemainingDevicePath only contains UART node,
+ // return unsupported, and vice versa.
+ //
+ Status = gBS->OpenProtocolInformation (
+ Controller,
+ &gEfiIsaIoProtocolGuid,
+ &OpenInfoBuffer,
+ &EntryCount
+ );
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ for (Index = 0; Index < EntryCount; Index ++) {
+ if ((OpenInfoBuffer[Index].Attributes & EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER) != 0) {
+ Status = gBS->OpenProtocol (
+ OpenInfoBuffer[Index].ControllerHandle,
+ &gEfiDevicePathProtocolGuid,
+ (VOID **) &DevicePath,
+ This->DriverBindingHandle,
+ Controller,
+ EFI_OPEN_PROTOCOL_GET_PROTOCOL
+ );
+ if (!EFI_ERROR (Status)) {
+ HasFlowControl = ContainsFlowControl (RemainingDevicePath);
+ if (HasFlowControl ^ ContainsFlowControl (DevicePath)) {
+ Status = EFI_UNSUPPORTED;
+ }
+ }
+ break;
+ }
+ }
+ FreePool (OpenInfoBuffer);
+ return Status;
+ }
+
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ //
+ // Close the I/O Abstraction(s) used to perform the supported test
+ //
+ gBS->CloseProtocol (
+ Controller,
+ &gEfiIsaIoProtocolGuid,
+ This->DriverBindingHandle,
+ Controller
+ );
+
+ //
+ // Open the EFI Device Path protocol needed to perform the supported test
+ //
+ Status = gBS->OpenProtocol (
+ Controller,
+ &gEfiDevicePathProtocolGuid,
+ (VOID **) &ParentDevicePath,
+ This->DriverBindingHandle,
+ Controller,
+ EFI_OPEN_PROTOCOL_BY_DRIVER
+ );
+ if (Status == EFI_ALREADY_STARTED) {
+ return EFI_SUCCESS;
+ }
+
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+ //
+ // Use the ISA I/O Protocol to see if Controller is standard ISA UART that
+ // can be managed by this driver.
+ //
+ Status = EFI_SUCCESS;
+ if (IsaIo->ResourceList->Device.HID != EISA_PNP_ID (0x501)) {
+ Status = EFI_UNSUPPORTED;
+ goto Error;
+ }
+
+Error:
+ //
+ // Close protocol, don't use device path protocol in the Support() function
+ //
+ gBS->CloseProtocol (
+ Controller,
+ &gEfiDevicePathProtocolGuid,
+ This->DriverBindingHandle,
+ Controller
+ );
+
+ return Status;
+}
+
+
+/**
+ Start to manage the controller.
+
+ @param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
+ @param[in] Controller The handle of the controller to test.
+ @param[in] RemainingDevicePath A pointer to the remaining portion of a device path.
+
+ @retval EFI_SUCCESS Driver is started successfully.
+
+**/
+EFI_STATUS
+EFIAPI
+SerialControllerDriverStart (
+ IN EFI_DRIVER_BINDING_PROTOCOL *This,
+ IN EFI_HANDLE Controller,
+ IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
+ )
+{
+ EFI_STATUS Status;
+ EFI_ISA_IO_PROTOCOL *IsaIo;
+ SERIAL_DEV *SerialDevice;
+ UINTN Index;
+ EFI_DEVICE_PATH_PROTOCOL *ParentDevicePath;
+ EFI_OPEN_PROTOCOL_INFORMATION_ENTRY *OpenInfoBuffer;
+ UINTN EntryCount;
+ EFI_SERIAL_IO_PROTOCOL *SerialIo;
+ UART_DEVICE_PATH *Uart;
+
+
+ SerialDevice = NULL;
+ //
+ // Get the Parent Device Path
+ //
+ Status = gBS->OpenProtocol (
+ Controller,
+ &gEfiDevicePathProtocolGuid,
+ (VOID **) &ParentDevicePath,
+ This->DriverBindingHandle,
+ Controller,
+ EFI_OPEN_PROTOCOL_BY_DRIVER
+ );
+ if (EFI_ERROR (Status) && Status != EFI_ALREADY_STARTED) {
+ return Status;
+ }
+ //
+ // Report status code enable the serial
+ //
+ REPORT_STATUS_CODE_WITH_DEVICE_PATH (
+ EFI_PROGRESS_CODE,
+ EFI_P_PC_ENABLE | EFI_PERIPHERAL_SERIAL_PORT,
+ ParentDevicePath
+ );
+
+ //
+ // Grab the IO abstraction we need to get any work done
+ //
+ Status = gBS->OpenProtocol (
+ Controller,
+ &gEfiIsaIoProtocolGuid,
+ (VOID **) &IsaIo,
+ This->DriverBindingHandle,
+ Controller,
+ EFI_OPEN_PROTOCOL_BY_DRIVER
+ );
+ if (EFI_ERROR (Status) && Status != EFI_ALREADY_STARTED) {
+ goto Error;
+ }
+
+ if (Status == EFI_ALREADY_STARTED) {
+
+ if (RemainingDevicePath == NULL || IsDevicePathEnd (RemainingDevicePath)) {
+ //
+ // If RemainingDevicePath is NULL or is the End of Device Path Node
+ //
+ return EFI_SUCCESS;
+ }
+
+ //
+ // Make sure a child handle does not already exist. This driver can only
+ // produce one child per serial port.
+ //
+ Status = gBS->OpenProtocolInformation (
+ Controller,
+ &gEfiIsaIoProtocolGuid,
+ &OpenInfoBuffer,
+ &EntryCount
+ );
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ Status = EFI_ALREADY_STARTED;
+ for (Index = 0; Index < EntryCount; Index ++) {
+ if ((OpenInfoBuffer[Index].Attributes & EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER) != 0) {
+ Status = gBS->OpenProtocol (
+ OpenInfoBuffer[Index].ControllerHandle,
+ &gEfiSerialIoProtocolGuid,
+ (VOID **) &SerialIo,
+ This->DriverBindingHandle,
+ Controller,
+ EFI_OPEN_PROTOCOL_GET_PROTOCOL
+ );
+ if (!EFI_ERROR (Status)) {
+ Uart = (UART_DEVICE_PATH *) RemainingDevicePath;
+ }
+ break;
+ }
+ }
+
+ FreePool (OpenInfoBuffer);
+ return Status;
+ }
+
+ if (RemainingDevicePath != NULL) {
+ if (IsDevicePathEnd (RemainingDevicePath)) {
+ //
+ // If RemainingDevicePath is the End of Device Path Node,
+ // skip enumerate any device and return EFI_SUCESSS
+ //
+ return EFI_SUCCESS;
+ }
+ }
+
+ //
+ // Initialize the serial device instance
+ //
+ SerialDevice = AllocateCopyPool (sizeof (SERIAL_DEV), &gSerialDevTempate);
+ if (SerialDevice == NULL) {
+ Status = EFI_OUT_OF_RESOURCES;
+ goto Error;
+ }
+
+ SerialDevice->SerialIo.Mode = &(SerialDevice->SerialMode);
+ SerialDevice->IsaIo = IsaIo;
+ SerialDevice->ParentDevicePath = ParentDevicePath;
+
+ //
+ // Check if RemainingDevicePath is NULL,
+ // if yes, use the values from the gSerialDevTempate as no remaining device path was
+ // passed in.
+ //
+ if (RemainingDevicePath != NULL) {
+ //
+ // If RemainingDevicePath isn't NULL,
+ // match the configuration of the RemainingDevicePath. IsHandleSupported()
+ // already checked to make sure the RemainingDevicePath contains settings
+ // that we can support.
+ //
+ CopyMem (&SerialDevice->UartDevicePath, RemainingDevicePath, sizeof (UART_DEVICE_PATH));
+ }
+
+ SerialDevice->HardwareFlowControl = UART_FLOW_CONTROL_HARDWARE;
+
+ //
+ // Report status code the serial present
+ //
+ REPORT_STATUS_CODE_WITH_DEVICE_PATH (
+ EFI_PROGRESS_CODE,
+ EFI_P_PC_PRESENCE_DETECT | EFI_PERIPHERAL_SERIAL_PORT,
+ ParentDevicePath
+ );
+
+ //
+ // Build the device path by appending the UART node to the ParentDevicePath.
+ // The Uart setings are zero here, since SetAttribute() will update them to match
+ // the default setings.
+ //
+ SerialDevice->DevicePath = AppendDevicePathNode (
+ ParentDevicePath,
+ (EFI_DEVICE_PATH_PROTOCOL *) &SerialDevice->UartDevicePath
+ );
+
+
+ //
+ // Fill in Serial I/O Mode structure based on either the RemainingDevicePath or defaults.
+ //
+ SerialDevice->SerialMode.BaudRate = SerialDevice->UartDevicePath.BaudRate;
+ SerialDevice->SerialMode.DataBits = SerialDevice->UartDevicePath.DataBits;
+ SerialDevice->SerialMode.Parity = SerialDevice->UartDevicePath.Parity;
+ SerialDevice->SerialMode.StopBits = SerialDevice->UartDevicePath.StopBits;
+
+ //
+ // Install protocol interfaces for the serial device.
+ //
+ Status = gBS->InstallMultipleProtocolInterfaces (
+ &SerialDevice->Handle,
+ &gEfiDevicePathProtocolGuid,
+ SerialDevice->DevicePath,
+ &gEfiSerialIoProtocolGuid,
+ &SerialDevice->SerialIo,
+ NULL
+ );
+ if (EFI_ERROR (Status)) {
+ goto Error;
+ }
+ //
+ // Open For Child Device
+ //
+ Status = gBS->OpenProtocol (
+ Controller,
+ &gEfiIsaIoProtocolGuid,
+ (VOID **) &IsaIo,
+ This->DriverBindingHandle,
+ SerialDevice->Handle,
+ EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
+ );
+
+Error:
+ if (EFI_ERROR (Status)) {
+ gBS->CloseProtocol (
+ Controller,
+ &gEfiDevicePathProtocolGuid,
+ This->DriverBindingHandle,
+ Controller
+ );
+ gBS->CloseProtocol (
+ Controller,
+ &gEfiIsaIoProtocolGuid,
+ This->DriverBindingHandle,
+ Controller
+ );
+ if (SerialDevice != NULL) {
+ if (SerialDevice->DevicePath != NULL) {
+ gBS->FreePool (SerialDevice->DevicePath);
+ }
+
+ FreeUnicodeStringTable (SerialDevice->ControllerNameTable);
+ gBS->FreePool (SerialDevice);
+ }
+ }
+
+ return Status;
+}
+
+
+/**
+ Disconnect this driver with the controller, uninstall related protocol instance
+
+ @param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
+ @param[in] Controller The handle of the controller to test.
+ @param[in] NumberOfChildren Number of child device.
+ @param[in] ChildHandleBuffer A pointer to the remaining portion of a device path.
+
+ @retval EFI_SUCCESS Operation successfully
+ @retval EFI_DEVICE_ERROR Cannot stop the driver successfully
+
+**/
+EFI_STATUS
+EFIAPI
+SerialControllerDriverStop (
+ IN EFI_DRIVER_BINDING_PROTOCOL *This,
+ IN EFI_HANDLE Controller,
+ IN UINTN NumberOfChildren,
+ IN EFI_HANDLE *ChildHandleBuffer
+ )
+{
+ EFI_STATUS Status;
+ UINTN Index;
+ BOOLEAN AllChildrenStopped;
+ EFI_SERIAL_IO_PROTOCOL *SerialIo;
+ SERIAL_DEV *SerialDevice;
+ EFI_ISA_IO_PROTOCOL *IsaIo;
+ EFI_DEVICE_PATH_PROTOCOL *DevicePath;
+
+ Status = gBS->HandleProtocol (
+ Controller,
+ &gEfiDevicePathProtocolGuid,
+ (VOID **) &DevicePath
+ );
+
+ //
+ // Report the status code disable the serial
+ //
+ REPORT_STATUS_CODE_WITH_DEVICE_PATH (
+ EFI_PROGRESS_CODE,
+ EFI_P_PC_DISABLE | EFI_PERIPHERAL_SERIAL_PORT,
+ DevicePath
+ );
+
+ //
+ // Complete all outstanding transactions to Controller.
+ // Don't allow any new transaction to Controller to be started.
+ //
+ if (NumberOfChildren == 0) {
+ //
+ // Close the bus driver
+ //
+ Status = gBS->CloseProtocol (
+ Controller,
+ &gEfiIsaIoProtocolGuid,
+ This->DriverBindingHandle,
+ Controller
+ );
+
+ Status = gBS->CloseProtocol (
+ Controller,
+ &gEfiDevicePathProtocolGuid,
+ This->DriverBindingHandle,
+ Controller
+ );
+ return Status;
+ }
+
+ AllChildrenStopped = TRUE;
+
+ for (Index = 0; Index < NumberOfChildren; Index++) {
+
+ Status = gBS->OpenProtocol (
+ ChildHandleBuffer[Index],
+ &gEfiSerialIoProtocolGuid,
+ (VOID **) &SerialIo,
+ This->DriverBindingHandle,
+ Controller,
+ EFI_OPEN_PROTOCOL_GET_PROTOCOL
+ );
+ if (!EFI_ERROR (Status)) {
+
+ SerialDevice = SERIAL_DEV_FROM_THIS (SerialIo);
+
+ Status = gBS->CloseProtocol (
+ Controller,
+ &gEfiIsaIoProtocolGuid,
+ This->DriverBindingHandle,
+ ChildHandleBuffer[Index]
+ );
+
+ Status = gBS->UninstallMultipleProtocolInterfaces (
+ ChildHandleBuffer[Index],
+ &gEfiDevicePathProtocolGuid,
+ SerialDevice->DevicePath,
+ &gEfiSerialIoProtocolGuid,
+ &SerialDevice->SerialIo,
+ NULL
+ );
+ if (EFI_ERROR (Status)) {
+ gBS->OpenProtocol (
+ Controller,
+ &gEfiIsaIoProtocolGuid,
+ (VOID **) &IsaIo,
+ This->DriverBindingHandle,
+ ChildHandleBuffer[Index],
+ EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
+ );
+ } else {
+ if (SerialDevice->DevicePath != NULL) {
+ gBS->FreePool (SerialDevice->DevicePath);
+ }
+
+ FreeUnicodeStringTable (SerialDevice->ControllerNameTable);
+ gBS->FreePool (SerialDevice);
+ }
+ }
+
+ if (EFI_ERROR (Status)) {
+ AllChildrenStopped = FALSE;
+ }
+ }
+
+ if (!AllChildrenStopped) {
+ return EFI_DEVICE_ERROR;
+ }
+
+ return EFI_SUCCESS;
+}
+
+
+/**
+ Detect whether specific FIFO is full or not.
+
+ @param[in] Fifo A pointer to the Data Structure SERIAL_DEV_FIFO.
+
+ @return whether specific FIFO is full or not.
+
+**/
+BOOLEAN
+IsaSerialFifoFull (
+ IN SERIAL_DEV_FIFO *Fifo
+ )
+{
+ if (Fifo->Surplus == 0) {
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+
+/**
+ Detect whether specific FIFO is empty or not.
+
+ @param[in] Fifo A pointer to the Data Structure SERIAL_DEV_FIFO.
+
+ @return whether specific FIFO is empty or not.
+
+**/
+BOOLEAN
+IsaSerialFifoEmpty (
+ IN SERIAL_DEV_FIFO *Fifo
+ )
+{
+ if (Fifo->Surplus == SERIAL_MAX_BUFFER_SIZE) {
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+
+/**
+ Add data to specific FIFO.
+
+ @param[in] Fifo A pointer to the Data Structure SERIAL_DEV_FIFO
+ @param[in] Data the data added to FIFO
+
+ @retval EFI_SUCCESS Add data to specific FIFO successfully
+ @retval EFI_OUT_OF_RESOURCE Failed to add data because FIFO is already full
+
+**/
+EFI_STATUS
+IsaSerialFifoAdd (
+ IN SERIAL_DEV_FIFO *Fifo,
+ IN UINT8 Data
+ )
+{
+ //
+ // if FIFO full can not add data
+ //
+ if (IsaSerialFifoFull (Fifo)) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+ //
+ // FIFO is not full can add data
+ //
+ Fifo->Data[Fifo->Last] = Data;
+ Fifo->Surplus--;
+ Fifo->Last++;
+ if (Fifo->Last == SERIAL_MAX_BUFFER_SIZE) {
+ Fifo->Last = 0;
+ }
+
+ return EFI_SUCCESS;
+}
+
+
+/**
+ Remove data from specific FIFO.
+
+ @param[in] Fifo A pointer to the Data Structure SERIAL_DEV_FIFO
+ @param[in] Data the data removed from FIFO
+
+ @retval EFI_SUCCESS Remove data from specific FIFO successfully
+ @retval EFI_OUT_OF_RESOURCE Failed to remove data because FIFO is empty
+
+**/
+EFI_STATUS
+IsaSerialFifoRemove (
+ IN SERIAL_DEV_FIFO *Fifo,
+ OUT UINT8 *Data
+ )
+{
+ //
+ // if FIFO is empty, no data can remove
+ //
+ if (IsaSerialFifoEmpty (Fifo)) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+ //
+ // FIFO is not empty, can remove data
+ //
+ *Data = Fifo->Data[Fifo->First];
+ Fifo->Surplus++;
+ Fifo->First++;
+ if (Fifo->First == SERIAL_MAX_BUFFER_SIZE) {
+ Fifo->First = 0;
+ }
+
+ return EFI_SUCCESS;
+}
+
+
+/**
+ Reads and writes all avaliable data.
+
+ @param[in] SerialDevice The device to flush
+
+ @retval EFI_SUCCESS Data was read/written successfully.
+ @retval EFI_OUT_OF_RESOURCE Failed because software receive FIFO is full. Note, when
+ this happens, pending writes are not done.
+
+**/
+EFI_STATUS
+IsaSerialReceiveTransmit (
+ IN SERIAL_DEV *SerialDevice
+ )
+{
+ SERIAL_PORT_LSR Lsr;
+ UINT8 Data;
+ BOOLEAN ReceiveFifoFull;
+ SERIAL_PORT_MSR Msr;
+ SERIAL_PORT_MCR Mcr;
+ UINTN TimeOut;
+
+ Data = 0;
+
+ //
+ // Begin the read or write
+ //
+ if (SerialDevice->SoftwareLoopbackEnable) {
+ do {
+ ReceiveFifoFull = IsaSerialFifoFull (&SerialDevice->Receive);
+ if (!IsaSerialFifoEmpty (&SerialDevice->Transmit)) {
+ IsaSerialFifoRemove (&SerialDevice->Transmit, &Data);
+ if (ReceiveFifoFull) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ IsaSerialFifoAdd (&SerialDevice->Receive, Data);
+ }
+ } while (!IsaSerialFifoEmpty (&SerialDevice->Transmit));
+ } else {
+ ReceiveFifoFull = IsaSerialFifoFull (&SerialDevice->Receive);
+ //
+ // For full handshake flow control, tell the peer to send data
+ // if receive buffer is available.
+ //
+ if (SerialDevice->HardwareFlowControl &&
+ !FeaturePcdGet(PcdIsaBusSerialUseHalfHandshake)&&
+ !ReceiveFifoFull
+ ) {
+ Mcr.Data = READ_MCR (SerialDevice->IsaIo, SerialDevice->BaseAddress);
+ Mcr.Bits.Rts = 1;
+ WRITE_MCR (SerialDevice->IsaIo, SerialDevice->BaseAddress, Mcr.Data);
+ }
+ do {
+ Lsr.Data = READ_LSR (SerialDevice->IsaIo, SerialDevice->BaseAddress);
+
+ //
+ // Flush incomming data to prevent a an overrun during a long write
+ //
+ if ((Lsr.Bits.Dr == 1) && !ReceiveFifoFull) {
+ ReceiveFifoFull = IsaSerialFifoFull (&SerialDevice->Receive);
+ if (!ReceiveFifoFull) {
+ if (Lsr.Bits.FIFOe == 1 || Lsr.Bits.Oe == 1 || Lsr.Bits.Pe == 1 || Lsr.Bits.Fe == 1 || Lsr.Bits.Bi == 1) {
+ REPORT_STATUS_CODE_WITH_DEVICE_PATH (
+ EFI_ERROR_CODE,
+ EFI_P_EC_INPUT_ERROR | EFI_PERIPHERAL_SERIAL_PORT,
+ SerialDevice->DevicePath
+ );
+ if (Lsr.Bits.FIFOe == 1 || Lsr.Bits.Pe == 1|| Lsr.Bits.Fe == 1 || Lsr.Bits.Bi == 1) {
+ Data = READ_RBR (SerialDevice->IsaIo, SerialDevice->BaseAddress);
+ continue;
+ }
+ }
+
+ Data = READ_RBR (SerialDevice->IsaIo, SerialDevice->BaseAddress);
+
+ IsaSerialFifoAdd (&SerialDevice->Receive, Data);
+
+ //
+ // For full handshake flow control, if receive buffer full
+ // tell the peer to stop sending data.
+ //
+ if (SerialDevice->HardwareFlowControl &&
+ !FeaturePcdGet(PcdIsaBusSerialUseHalfHandshake) &&
+ IsaSerialFifoFull (&SerialDevice->Receive)
+ ) {
+ Mcr.Data = READ_MCR (SerialDevice->IsaIo, SerialDevice->BaseAddress);
+ Mcr.Bits.Rts = 0;
+ WRITE_MCR (SerialDevice->IsaIo, SerialDevice->BaseAddress, Mcr.Data);
+ }
+
+
+ continue;
+ } else {
+ REPORT_STATUS_CODE_WITH_DEVICE_PATH (
+ EFI_PROGRESS_CODE,
+ EFI_P_SERIAL_PORT_PC_CLEAR_BUFFER | EFI_PERIPHERAL_SERIAL_PORT,
+ SerialDevice->DevicePath
+ );
+ }
+ }
+ //
+ // Do the write
+ //
+ if (Lsr.Bits.Thre == 1 && !IsaSerialFifoEmpty (&SerialDevice->Transmit)) {
+ //
+ // Make sure the transmit data will not be missed
+ //
+ if (SerialDevice->HardwareFlowControl) {
+ //
+ // For half handshake flow control assert RTS before sending.
+ //
+ if (FeaturePcdGet(PcdIsaBusSerialUseHalfHandshake)) {
+ Mcr.Data = READ_MCR (SerialDevice->IsaIo, SerialDevice->BaseAddress);
+ Mcr.Bits.Rts= 0;
+ WRITE_MCR (SerialDevice->IsaIo, SerialDevice->BaseAddress, Mcr.Data);
+ }
+ //
+ // Wait for CTS
+ //
+ TimeOut = 0;
+ Msr.Data = READ_MSR (SerialDevice->IsaIo, SerialDevice->BaseAddress);
+ while ((Msr.Bits.Dcd == 1) && ((Msr.Bits.Cts == 0) ^ FeaturePcdGet(PcdIsaBusSerialUseHalfHandshake))) {
+ gBS->Stall (TIMEOUT_STALL_INTERVAL);
+ TimeOut++;
+ if (TimeOut > 5) {
+ break;
+ }
+
+ Msr.Data = READ_MSR (SerialDevice->IsaIo, SerialDevice->BaseAddress);
+ }
+
+ if ((Msr.Bits.Dcd == 0) || ((Msr.Bits.Cts == 1) ^ FeaturePcdGet(PcdIsaBusSerialUseHalfHandshake))) {
+ IsaSerialFifoRemove (&SerialDevice->Transmit, &Data);
+ WRITE_THR (SerialDevice->IsaIo, SerialDevice->BaseAddress, Data);
+ }
+
+ //
+ // For half handshake flow control, tell DCE we are done.
+ //
+ if (FeaturePcdGet(PcdIsaBusSerialUseHalfHandshake)) {
+ Mcr.Data = READ_MCR (SerialDevice->IsaIo, SerialDevice->BaseAddress);
+ Mcr.Bits.Rts = 1;
+ WRITE_MCR (SerialDevice->IsaIo, SerialDevice->BaseAddress, Mcr.Data);
+ }
+ } else {
+ IsaSerialFifoRemove (&SerialDevice->Transmit, &Data);
+ WRITE_THR (SerialDevice->IsaIo, SerialDevice->BaseAddress, Data);
+ }
+ }
+ } while (Lsr.Bits.Thre == 1 && !IsaSerialFifoEmpty (&SerialDevice->Transmit));
+ }
+
+ return EFI_SUCCESS;
+}
+
+
+/**
+ Reset serial device.
+
+ @param[in] This Pointer to EFI_SERIAL_IO_PROTOCOL
+
+ @retval EFI_SUCCESS Reset successfully
+ @retval EFI_DEVICE_ERROR Failed to reset
+
+**/
+EFI_STATUS
+EFIAPI
+IsaSerialReset (
+ IN EFI_SERIAL_IO_PROTOCOL *This
+ )
+{
+ EFI_STATUS Status = EFI_SUCCESS;
+ SERIAL_DEV *SerialDevice;
+ SERIAL_PORT_LCR Lcr;
+ SERIAL_PORT_IER Ier;
+ SERIAL_PORT_MCR Mcr;
+ SERIAL_PORT_FCR Fcr;
+ EFI_TPL Tpl;
+ UINT32 Control;
+
+ SerialDevice = SERIAL_DEV_FROM_THIS (This);
+
+ //
+ // Report the status code reset the serial
+ //
+ REPORT_STATUS_CODE_WITH_DEVICE_PATH (
+ EFI_PROGRESS_CODE,
+ EFI_P_PC_RESET | EFI_PERIPHERAL_SERIAL_PORT,
+ SerialDevice->DevicePath
+ );
+
+ Tpl = gBS->RaiseTPL (TPL_NOTIFY);
+
+ //
+ // Make sure DLAB is 0.
+ //
+ Lcr.Data = READ_LCR (SerialDevice->IsaIo, SerialDevice->BaseAddress);
+ Lcr.Bits.DLab = 0;
+ WRITE_LCR (SerialDevice->IsaIo, SerialDevice->BaseAddress, Lcr.Data);
+
+ //
+ // Turn off all interrupts
+ //
+ Ier.Data = READ_IER (SerialDevice->IsaIo, SerialDevice->BaseAddress);
+ Ier.Bits.Ravie = 0;
+ Ier.Bits.Theie = 0;
+ Ier.Bits.Rie = 0;
+ Ier.Bits.Mie = 0;
+ WRITE_IER (SerialDevice->IsaIo, SerialDevice->BaseAddress, Ier.Data);
+
+ //
+ // Disable the FIFO.
+ //
+ Fcr.Bits.TrFIFOE = 0;
+ WRITE_FCR (SerialDevice->IsaIo, SerialDevice->BaseAddress, Fcr.Data);
+
+ //
+ // Turn off loopback and disable device interrupt.
+ //
+ Mcr.Data = READ_MCR (SerialDevice->IsaIo, SerialDevice->BaseAddress);
+ Mcr.Bits.Out1 = 0;
+ Mcr.Bits.Out2 = 0;
+ Mcr.Bits.Lme = 0;
+ WRITE_MCR (SerialDevice->IsaIo, SerialDevice->BaseAddress, Mcr.Data);
+
+ //
+ // Clear the scratch pad register
+ //
+ WRITE_SCR (SerialDevice->IsaIo, SerialDevice->BaseAddress, 0);
+
+
+ if (EFI_ERROR (Status)) {
+ gBS->RestoreTPL (Tpl);
+ return EFI_DEVICE_ERROR;
+ }
+ //
+ // Go set the current control bits
+ //
+ Control = 0;
+ if (SerialDevice->HardwareFlowControl) {
+ Control |= EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE;
+ }
+ if (SerialDevice->SoftwareLoopbackEnable) {
+ Control |= EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE;
+ }
+ //
+ // for 16550A enable FIFO, 16550 disable FIFO
+ //
+ Fcr.Bits.TrFIFOE = 1;
+ Fcr.Bits.ResetRF = 1;
+ Fcr.Bits.ResetTF = 1;
+ WRITE_FCR (SerialDevice->IsaIo, SerialDevice->BaseAddress, Fcr.Data);
+
+ //
+ // Reset the software FIFO
+ //
+ SerialDevice->Receive.First = 0;
+ SerialDevice->Receive.Last = 0;
+ SerialDevice->Receive.Surplus = SERIAL_MAX_BUFFER_SIZE;
+ SerialDevice->Transmit.First = 0;
+ SerialDevice->Transmit.Last = 0;
+ SerialDevice->Transmit.Surplus = SERIAL_MAX_BUFFER_SIZE;
+
+ gBS->RestoreTPL (Tpl);
+
+ //
+ // Device reset is complete
+ //
+ return EFI_SUCCESS;
+}
+
+
+/**
+ Set new attributes to a serial device.
+
+ @param[in] This Pointer to EFI_SERIAL_IO_PROTOCOL
+ @param[in] BaudRate The baudrate of the serial device
+ @param[in] ReceiveFifoDepth The depth of receive FIFO buffer
+ @param[in] Timeout The request timeout for a single char
+ @param[in] Parity The type of parity used in serial device
+ @param[in] DataBits Number of databits used in serial device
+ @param[in] StopBits Number of stopbits used in serial device
+
+ @retval EFI_SUCCESS The new attributes were set
+ @retval EFI_INVALID_PARAMETERS One or more attributes have an unsupported value
+ @retval EFI_UNSUPPORTED Data Bits can not set to 5 or 6
+ @retval EFI_DEVICE_ERROR The serial device is not functioning correctly (no return)
+
+**/
+EFI_STATUS
+EFIAPI
+IsaSerialSetAttributes (
+ IN EFI_SERIAL_IO_PROTOCOL *This,
+ IN UINT64 BaudRate,
+ IN UINT32 ReceiveFifoDepth,
+ IN UINT32 Timeout,
+ IN EFI_PARITY_TYPE Parity,
+ IN UINT8 DataBits,
+ IN EFI_STOP_BITS_TYPE StopBits
+ )
+{
+ EFI_STATUS Status;
+ SERIAL_DEV *SerialDevice;
+ UINT32 Divisor;
+ UINT32 Remained;
+ SERIAL_PORT_LCR Lcr;
+ UART_DEVICE_PATH *Uart;
+ EFI_TPL Tpl;
+
+ SerialDevice = SERIAL_DEV_FROM_THIS (This);
+
+ //
+ // Check for default settings and fill in actual values.
+ //
+ if (BaudRate == 0) {
+ BaudRate = PcdGet64 (PcdUartDefaultBaudRate);
+ }
+
+ if (ReceiveFifoDepth == 0) {
+ ReceiveFifoDepth = SERIAL_PORT_DEFAULT_RECEIVE_FIFO_DEPTH;
+ }
+
+ if (Timeout == 0) {
+ Timeout = SERIAL_PORT_DEFAULT_TIMEOUT;
+ }
+
+ if (Parity == DefaultParity) {
+ Parity = (EFI_PARITY_TYPE) PcdGet8 (PcdUartDefaultParity);
+ }
+
+ if (DataBits == 0) {
+ DataBits = PcdGet8 (PcdUartDefaultDataBits);
+ }
+
+ if (StopBits == DefaultStopBits) {
+ StopBits = (EFI_STOP_BITS_TYPE) PcdGet8 (PcdUartDefaultStopBits);
+ }
+ //
+ // 5 and 6 data bits can not be verified on a 16550A UART
+ // Return EFI_INVALID_PARAMETER if an attempt is made to use these settings.
+ //
+ if ((DataBits == 5) || (DataBits == 6)) {
+ return EFI_INVALID_PARAMETER;
+ }
+ //
+ // Make sure all parameters are valid
+ //
+ if ((BaudRate > SERIAL_PORT_MAX_BAUD_RATE) || (BaudRate < SERIAL_PORT_MIN_BAUD_RATE)) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ if (BaudRate < 75) {
+ BaudRate = 50;
+ } else if (BaudRate < 110) {
+ BaudRate = 75;
+ } else if (BaudRate < 134) {
+ BaudRate = 110;
+ } else if (BaudRate < 150) {
+ BaudRate = 134;
+ } else if (BaudRate < 300) {
+ BaudRate = 150;
+ } else if (BaudRate < 600) {
+ BaudRate = 300;
+ } else if (BaudRate < 1200) {
+ BaudRate = 600;
+ } else if (BaudRate < 1800) {
+ BaudRate = 1200;
+ } else if (BaudRate < 2000) {
+ BaudRate = 1800;
+ } else if (BaudRate < 2400) {
+ BaudRate = 2000;
+ } else if (BaudRate < 3600) {
+ BaudRate = 2400;
+ } else if (BaudRate < 4800) {
+ BaudRate = 3600;
+ } else if (BaudRate < 7200) {
+ BaudRate = 4800;
+ } else if (BaudRate < 9600) {
+ BaudRate = 7200;
+ } else if (BaudRate < 19200) {
+ BaudRate = 9600;
+ } else if (BaudRate < 38400) {
+ BaudRate = 19200;
+ } else if (BaudRate < 57600) {
+ BaudRate = 38400;
+ } else if (BaudRate < 115200) {
+ BaudRate = 57600;
+ } else if (BaudRate <= SERIAL_PORT_MAX_BAUD_RATE) {
+ BaudRate = 115200;
+ }
+
+ if ((ReceiveFifoDepth < 1) || (ReceiveFifoDepth > SERIAL_PORT_MAX_RECEIVE_FIFO_DEPTH)) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ if ((Timeout < SERIAL_PORT_MIN_TIMEOUT) || (Timeout > SERIAL_PORT_MAX_TIMEOUT)) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ if ((Parity < NoParity) || (Parity > SpaceParity)) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ if ((DataBits < 5) || (DataBits > 8)) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ if ((StopBits < OneStopBit) || (StopBits > TwoStopBits)) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ //
+ // for DataBits = 6,7,8, StopBits can not set OneFiveStopBits
+ //
+ if ((DataBits >= 6) && (DataBits <= 8) && (StopBits == OneFiveStopBits)) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ //
+ // Compute divisor use to program the baud rate using a round determination
+ //
+ Divisor = (UINT32) DivU64x32Remainder (
+ SERIAL_PORT_INPUT_CLOCK,
+ ((UINT32) BaudRate * 16),
+ &Remained
+ );
+ if (Remained != 0) {
+ Divisor += 1;
+ }
+
+ if ((Divisor == 0) || ((Divisor & 0xffff0000) != 0)) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ Tpl = gBS->RaiseTPL (TPL_NOTIFY);
+
+ //
+ // Compute the actual baud rate that the serial port will be programmed for.
+ //
+ BaudRate = SERIAL_PORT_INPUT_CLOCK / Divisor / 16;
+
+ //
+ // Put serial port on Divisor Latch Mode
+ //
+ Lcr.Data = READ_LCR (SerialDevice->IsaIo, SerialDevice->BaseAddress);
+ Lcr.Bits.DLab = 1;
+ WRITE_LCR (SerialDevice->IsaIo, SerialDevice->BaseAddress, Lcr.Data);
+
+ //
+ // Write the divisor to the serial port
+ //
+ WRITE_DLL (SerialDevice->IsaIo, SerialDevice->BaseAddress, (UINT8) (Divisor & 0xff));
+ WRITE_DLM (SerialDevice->IsaIo, SerialDevice->BaseAddress, (UINT8) ((Divisor >> 8) & 0xff));
+
+ //
+ // Put serial port back in normal mode and set remaining attributes.
+ //
+ Lcr.Bits.DLab = 0;
+
+ switch (Parity) {
+ case NoParity:
+ Lcr.Bits.ParEn = 0;
+ Lcr.Bits.EvenPar = 0;
+ Lcr.Bits.SticPar = 0;
+ break;
+
+ case EvenParity:
+ Lcr.Bits.ParEn = 1;
+ Lcr.Bits.EvenPar = 1;
+ Lcr.Bits.SticPar = 0;
+ break;
+
+ case OddParity:
+ Lcr.Bits.ParEn = 1;
+ Lcr.Bits.EvenPar = 0;
+ Lcr.Bits.SticPar = 0;
+ break;
+
+ case SpaceParity:
+ Lcr.Bits.ParEn = 1;
+ Lcr.Bits.EvenPar = 1;
+ Lcr.Bits.SticPar = 1;
+ break;
+
+ case MarkParity:
+ Lcr.Bits.ParEn = 1;
+ Lcr.Bits.EvenPar = 0;
+ Lcr.Bits.SticPar = 1;
+ break;
+
+ default:
+ break;
+ }
+
+ switch (StopBits) {
+ case OneStopBit:
+ Lcr.Bits.StopB = 0;
+ break;
+
+ case OneFiveStopBits:
+ case TwoStopBits:
+ Lcr.Bits.StopB = 1;
+ break;
+
+ default:
+ break;
+ }
+
+ //
+ // DataBits
+ //
+ Lcr.Bits.SerialDB = (UINT8) ((DataBits - 5) & 0x03);
+ WRITE_LCR (SerialDevice->IsaIo, SerialDevice->BaseAddress, Lcr.Data);
+
+ //
+ // Set the Serial I/O mode
+ //
+ This->Mode->BaudRate = BaudRate;
+ This->Mode->ReceiveFifoDepth = ReceiveFifoDepth;
+ This->Mode->Timeout = Timeout;
+ This->Mode->Parity = Parity;
+ This->Mode->DataBits = DataBits;
+ This->Mode->StopBits = StopBits;
+
+ //
+ // See if Device Path Node has actually changed
+ //
+ if (SerialDevice->UartDevicePath.BaudRate == BaudRate &&
+ SerialDevice->UartDevicePath.DataBits == DataBits &&
+ SerialDevice->UartDevicePath.Parity == Parity &&
+ SerialDevice->UartDevicePath.StopBits == StopBits
+ ) {
+ gBS->RestoreTPL (Tpl);
+ return EFI_SUCCESS;
+ }
+
+ //
+ // Update the device path
+ //
+ SerialDevice->UartDevicePath.BaudRate = BaudRate;
+ SerialDevice->UartDevicePath.DataBits = DataBits;
+ SerialDevice->UartDevicePath.Parity = (UINT8) Parity;
+ SerialDevice->UartDevicePath.StopBits = (UINT8) StopBits;
+
+ Status = EFI_SUCCESS;
+ if (SerialDevice->Handle != NULL) {
+ Uart = (UART_DEVICE_PATH *) (
+ (UINTN) SerialDevice->DevicePath
+ + GetDevicePathSize (SerialDevice->ParentDevicePath)
+ - END_DEVICE_PATH_LENGTH
+ );
+ CopyMem (Uart, &SerialDevice->UartDevicePath, sizeof (UART_DEVICE_PATH));
+ Status = gBS->ReinstallProtocolInterface (
+ SerialDevice->Handle,
+ &gEfiDevicePathProtocolGuid,
+ SerialDevice->DevicePath,
+ SerialDevice->DevicePath
+ );
+ }
+
+ gBS->RestoreTPL (Tpl);
+
+ return Status;
+}
+
+
+/**
+ Set Control Bits.
+
+ @param[in] This Pointer to EFI_SERIAL_IO_PROTOCOL
+ @param[in] Control Control bits that can be settable
+
+ @retval EFI_SUCCESS New Control bits were set successfully
+ @retval EFI_UNSUPPORTED The Control bits wanted to set are not supported
+
+**/
+EFI_STATUS
+EFIAPI
+IsaSerialSetControl (
+ IN EFI_SERIAL_IO_PROTOCOL *This,
+ IN UINT32 Control
+ )
+{
+ SERIAL_DEV *SerialDevice;
+ SERIAL_PORT_MCR Mcr;
+ EFI_TPL Tpl;
+ UART_FLOW_CONTROL_DEVICE_PATH *FlowControl;
+ EFI_STATUS Status;
+
+ //
+ // The control bits that can be set are :
+ // EFI_SERIAL_DATA_TERMINAL_READY: 0x0001 // WO
+ // EFI_SERIAL_REQUEST_TO_SEND: 0x0002 // WO
+ // EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE: 0x1000 // RW
+ // EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE: 0x2000 // RW
+ // EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE: 0x4000 // RW
+ //
+ SerialDevice = SERIAL_DEV_FROM_THIS (This);
+
+ //
+ // first determine the parameter is invalid
+ //
+ if ((Control & (~(EFI_SERIAL_REQUEST_TO_SEND | EFI_SERIAL_DATA_TERMINAL_READY |
+ EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE | EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE |
+ EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE))) != 0) {
+ return EFI_UNSUPPORTED;
+ }
+
+ Tpl = gBS->RaiseTPL (TPL_NOTIFY);
+
+ Mcr.Data = READ_MCR (SerialDevice->IsaIo, SerialDevice->BaseAddress);
+ Mcr.Bits.DtrC = 0;
+ Mcr.Bits.Rts = 0;
+ Mcr.Bits.Lme = 0;
+ SerialDevice->SoftwareLoopbackEnable = FALSE;
+ SerialDevice->HardwareFlowControl = FALSE;
+
+ if ((Control & EFI_SERIAL_DATA_TERMINAL_READY) == EFI_SERIAL_DATA_TERMINAL_READY) {
+ Mcr.Bits.DtrC = 1;
+ }
+
+ if ((Control & EFI_SERIAL_REQUEST_TO_SEND) == EFI_SERIAL_REQUEST_TO_SEND) {
+ Mcr.Bits.Rts = 1;
+ }
+
+ if ((Control & EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE) == EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE) {
+ Mcr.Bits.Lme = 1;
+ }
+
+ if ((Control & EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE) == EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE) {
+ SerialDevice->HardwareFlowControl = TRUE;
+ }
+
+ WRITE_MCR (SerialDevice->IsaIo, SerialDevice->BaseAddress, Mcr.Data);
+
+ if ((Control & EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE) == EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE) {
+ SerialDevice->SoftwareLoopbackEnable = TRUE;
+ }
+
+ Status = EFI_SUCCESS;
+ if (SerialDevice->Handle != NULL) {
+ FlowControl = (UART_FLOW_CONTROL_DEVICE_PATH *) (
+ (UINTN) SerialDevice->DevicePath
+ + GetDevicePathSize (SerialDevice->ParentDevicePath)
+ - END_DEVICE_PATH_LENGTH
+ + sizeof (UART_DEVICE_PATH)
+ );
+ if (IsUartFlowControlNode (FlowControl) &&
+ ((ReadUnaligned32 (&FlowControl->FlowControlMap) == UART_FLOW_CONTROL_HARDWARE) ^ SerialDevice->HardwareFlowControl)) {
+ //
+ // Flow Control setting is changed, need to reinstall device path protocol
+ //
+ WriteUnaligned32 (&FlowControl->FlowControlMap, SerialDevice->HardwareFlowControl ? UART_FLOW_CONTROL_HARDWARE : 0);
+ Status = gBS->ReinstallProtocolInterface (
+ SerialDevice->Handle,
+ &gEfiDevicePathProtocolGuid,
+ SerialDevice->DevicePath,
+ SerialDevice->DevicePath
+ );
+ }
+ }
+
+ gBS->RestoreTPL (Tpl);
+
+ return Status;
+}
+
+
+/**
+ Get Control Bits.
+
+ @param[in] This Pointer to EFI_SERIAL_IO_PROTOCOL
+ @param[out] Control Control signals of the serial device
+
+ @retval EFI_SUCCESS Get Control signals successfully
+
+**/
+EFI_STATUS
+EFIAPI
+IsaSerialGetControl (
+ IN EFI_SERIAL_IO_PROTOCOL *This,
+ OUT UINT32 *Control
+ )
+{
+ SERIAL_DEV *SerialDevice;
+ SERIAL_PORT_MSR Msr;
+ SERIAL_PORT_MCR Mcr;
+ EFI_TPL Tpl;
+
+ Tpl = gBS->RaiseTPL (TPL_NOTIFY);
+
+ SerialDevice = SERIAL_DEV_FROM_THIS (This);
+
+ *Control = 0;
+
+ //
+ // Read the Modem Status Register
+ //
+ Msr.Data = READ_MSR (SerialDevice->IsaIo, SerialDevice->BaseAddress);
+
+ if (Msr.Bits.Cts == 1) {
+ *Control |= EFI_SERIAL_CLEAR_TO_SEND;
+ }
+
+ if (Msr.Bits.Dsr == 1) {
+ *Control |= EFI_SERIAL_DATA_SET_READY;
+ }
+
+ if (Msr.Bits.Ri == 1) {
+ *Control |= EFI_SERIAL_RING_INDICATE;
+ }
+
+ if (Msr.Bits.Dcd == 1) {
+ *Control |= EFI_SERIAL_CARRIER_DETECT;
+ }
+ //
+ // Read the Modem Control Register
+ //
+ Mcr.Data = READ_MCR (SerialDevice->IsaIo, SerialDevice->BaseAddress);
+
+ if (Mcr.Bits.DtrC == 1) {
+ *Control |= EFI_SERIAL_DATA_TERMINAL_READY;
+ }
+
+ if (Mcr.Bits.Rts == 1) {
+ *Control |= EFI_SERIAL_REQUEST_TO_SEND;
+ }
+
+ if (Mcr.Bits.Lme == 1) {
+ *Control |= EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE;
+ }
+
+ if (SerialDevice->HardwareFlowControl) {
+ *Control |= EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE;
+ }
+ //
+ // See if the Transmit FIFO is empty
+ //
+ IsaSerialReceiveTransmit (SerialDevice);
+
+ if (IsaSerialFifoEmpty (&SerialDevice->Transmit)) {
+ *Control |= EFI_SERIAL_OUTPUT_BUFFER_EMPTY;
+ }
+ //
+ // See if the Receive FIFO is empty.
+ //
+ IsaSerialReceiveTransmit (SerialDevice);
+
+ if (IsaSerialFifoEmpty (&SerialDevice->Receive)) {
+ *Control |= EFI_SERIAL_INPUT_BUFFER_EMPTY;
+ }
+
+ if (SerialDevice->SoftwareLoopbackEnable) {
+ *Control |= EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE;
+ }
+
+ gBS->RestoreTPL (Tpl);
+
+ return EFI_SUCCESS;
+}
+
+
+/**
+ Write the specified number of bytes to serial device.
+
+ @param[in] This Pointer to EFI_SERIAL_IO_PROTOCOL
+ @param[in, out] BufferSize On input the size of Buffer, on output the amount of
+ data actually written
+ @param[in] Buffer The buffer of data to write
+
+ @retval EFI_SUCCESS The data were written successfully
+ @retval EFI_DEVICE_ERROR The device reported an error
+ @retval EFI_TIMEOUT The write operation was stopped due to timeout
+
+**/
+EFI_STATUS
+EFIAPI
+IsaSerialWrite (
+ IN EFI_SERIAL_IO_PROTOCOL *This,
+ IN OUT UINTN *BufferSize,
+ IN VOID *Buffer
+ )
+{
+ UINT8 *CharBuffer;
+ EFI_TPL Tpl;
+
+ if (*BufferSize == 0) {
+ return EFI_SUCCESS;
+ }
+
+ if (Buffer == NULL) {
+ return EFI_DEVICE_ERROR;
+ }
+
+ Tpl = gBS->RaiseTPL (TPL_NOTIFY);
+
+ CharBuffer = (UINT8 *) Buffer;
+
+ PchSerialIoUartOut (Uart2, CharBuffer, *BufferSize);
+
+ gBS->RestoreTPL (Tpl);
+
+ return EFI_SUCCESS;
+}
+
+
+/**
+ Read the specified number of bytes from serial device.
+
+ @param[in] This Pointer to EFI_SERIAL_IO_PROTOCOL
+ @param[in, out] BufferSize On input the size of Buffer, on output the amount of
+ data returned in buffer
+ @param[out] Buffer The buffer to return the data into
+
+ @retval EFI_SUCCESS The data were read successfully
+ @retval EFI_DEVICE_ERROR The device reported an error
+ @retval EFI_TIMEOUT The read operation was stopped due to timeout
+
+**/
+EFI_STATUS
+EFIAPI
+IsaSerialRead (
+ IN EFI_SERIAL_IO_PROTOCOL *This,
+ IN OUT UINTN *BufferSize,
+ OUT VOID *Buffer
+ )
+{
+ SERIAL_DEV *SerialDevice;
+ EFI_TPL Tpl;
+
+ SerialDevice = SERIAL_DEV_FROM_THIS (This);
+
+ if (*BufferSize == 0) {
+ return EFI_SUCCESS;
+ }
+
+ if (Buffer == NULL) {
+ return EFI_DEVICE_ERROR;
+ }
+
+ Tpl = gBS->RaiseTPL (TPL_NOTIFY);
+
+ *BufferSize = PchSerialIoUartIn(Uart2, Buffer, *BufferSize, FALSE);
+
+ gBS->RestoreTPL (Tpl);
+
+ return EFI_SUCCESS;
+}
+
+
+/**
+ Use scratchpad register to test if this serial port is present.
+
+ @param[in] SerialDevice Pointer to serial device structure
+
+ @return if this serial port is present
+
+**/
+BOOLEAN
+IsaSerialPortPresent (
+ IN SERIAL_DEV *SerialDevice
+ )
+{
+ UINT8 Temp;
+ BOOLEAN Status;
+
+ Status = TRUE;
+
+ //
+ // Save SCR reg
+ //
+ Temp = READ_SCR (SerialDevice->IsaIo, SerialDevice->BaseAddress);
+ WRITE_SCR (SerialDevice->IsaIo, SerialDevice->BaseAddress, 0xAA);
+
+ if (READ_SCR (SerialDevice->IsaIo, SerialDevice->BaseAddress) != 0xAA) {
+ Status = FALSE;
+ }
+
+ WRITE_SCR (SerialDevice->IsaIo, SerialDevice->BaseAddress, 0x55);
+
+ if (READ_SCR (SerialDevice->IsaIo, SerialDevice->BaseAddress) != 0x55) {
+ Status = FALSE;
+ }
+ //
+ // Restore SCR
+ //
+ WRITE_SCR (SerialDevice->IsaIo, SerialDevice->BaseAddress, Temp);
+
+ return Status;
+}
+
+
+/**
+ Use IsaIo protocol to read serial port.
+
+ @param[in] IsaIo Pointer to EFI_ISA_IO_PROTOCOL instance
+ @param[in] BaseAddress Serial port register group base address
+ @param[in] Offset Offset in register group
+
+ @return Data read from serial port
+
+**/
+UINT8
+IsaSerialReadPort (
+ IN EFI_ISA_IO_PROTOCOL *IsaIo,
+ IN UINT16 BaseAddress,
+ IN UINT32 Offset
+ )
+{
+ UINT8 Data;
+
+ //
+ // Use IsaIo to access IO
+ //
+ IsaIo->Io.Read (
+ IsaIo,
+ EfiIsaIoWidthUint8,
+ BaseAddress + Offset,
+ 1,
+ &Data
+ );
+
+ return Data;
+}
+
+
+/**
+ Use IsaIo protocol to write serial port.
+
+ @param[in] IsaIo Pointer to EFI_ISA_IO_PROTOCOL instance
+ @param[in] BaseAddress Serial port register group base address
+ @param[in] Offset Offset in register group
+ @param[in] Data data which is to be written to some serial port register
+
+**/
+VOID
+IsaSerialWritePort (
+ IN EFI_ISA_IO_PROTOCOL *IsaIo,
+ IN UINT16 BaseAddress,
+ IN UINT32 Offset,
+ IN UINT8 Data
+ )
+{
+ //
+ // Use IsaIo to access IO
+ //
+ IsaIo->Io.Write (
+ IsaIo,
+ EfiIsaIoWidthUint8,
+ BaseAddress + Offset,
+ 1,
+ &Data
+ );
+}
+
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