/** @file
  Definitions and prototypes for DebugPort driver.

Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#ifndef __DEBUGPORT_H__
#define __DEBUGPORT_H__


#include <Uefi.h>

#include <Protocol/DevicePath.h>
#include <Protocol/ComponentName.h>
#include <Protocol/DriverBinding.h>
#include <Protocol/SerialIo.h>
#include <Protocol/DebugPort.h>

#include <Library/DebugLib.h>
#include <Library/UefiDriverEntryPoint.h>
#include <Library/UefiLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiRuntimeServicesTableLib.h>
#include <Library/DevicePathLib.h>

//
// Driver Binding Externs
//
extern EFI_DRIVER_BINDING_PROTOCOL  gDebugPortDriverBinding;
extern EFI_COMPONENT_NAME_PROTOCOL  gDebugPortComponentName;
extern EFI_COMPONENT_NAME2_PROTOCOL gDebugPortComponentName2;

//
// local type definitions
//
#define DEBUGPORT_DEVICE_SIGNATURE  SIGNATURE_32 ('D', 'B', 'G', 'P')

//
// Device structure used by driver
//
typedef struct {
  UINT32                      Signature;
  EFI_HANDLE                  DriverBindingHandle;
  EFI_HANDLE                  DebugPortDeviceHandle;

  EFI_DEVICE_PATH_PROTOCOL    *DebugPortDevicePath;
  EFI_DEBUGPORT_PROTOCOL      DebugPortInterface;

  EFI_HANDLE                  SerialIoDeviceHandle;
  EFI_SERIAL_IO_PROTOCOL      *SerialIoBinding;
  UINT64                      BaudRate;
  UINT32                      ReceiveFifoDepth;
  UINT32                      Timeout;
  EFI_PARITY_TYPE             Parity;
  UINT8                       DataBits;
  EFI_STOP_BITS_TYPE          StopBits;
} DEBUGPORT_DEVICE;

#define DEBUGPORT_DEVICE_FROM_THIS(a)     CR (a, DEBUGPORT_DEVICE, DebugPortInterface, DEBUGPORT_DEVICE_SIGNATURE)

#define EFI_ACPI_PC_COMPORT_HID           EISA_PNP_ID (0x0500)
#define EFI_ACPI_16550UART_HID            EISA_PNP_ID (0x0501)

#define DEBUGPORT_UART_DEFAULT_BAUDRATE   115200
#define DEBUGPORT_UART_DEFAULT_PARITY     0
#define DEBUGPORT_UART_DEFAULT_FIFO_DEPTH 16
#define DEBUGPORT_UART_DEFAULT_TIMEOUT    50000 ///< 5 ms
#define DEBUGPORT_UART_DEFAULT_DATA_BITS  8
#define DEBUGPORT_UART_DEFAULT_STOP_BITS  1

#define DEBUGPORT_DRIVER_VERSION          1

#define IS_UART_DEVICEPATH(dp)           (DevicePathType (dp) == MESSAGING_DEVICE_PATH && DevicePathSubType (dp) == MSG_UART_DP)

/**
  Debug Port Driver entry point.

  Reads DebugPort variable to determine what device and settings to use as the
  debug port.  Binds exclusively to SerialIo. Reverts to defaults if no variable
  is found.

  @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 EFI_OUT_OF_RESOURCES Fails to allocate memory for device.
  @retval other                Some error occurs when executing this entry point.

**/
EFI_STATUS
EFIAPI
InitializeDebugPortDriver (
  IN EFI_HANDLE                     ImageHandle,
  IN EFI_SYSTEM_TABLE               *SystemTable
  );

/**
  Checks to see if there's not already a DebugPort interface somewhere.

  If there's a DEBUGPORT variable, the device path must match exactly.  If there's
  no DEBUGPORT variable, then device path is not checked and does not matter.
  Checks to see that there's a serial io interface on the controller handle
  that can be bound BY_DRIVER | EXCLUSIVE.
  If all these tests succeed, then we return EFI_SUCCESS, else, EFI_UNSUPPORTED
  or other error returned by OpenProtocol.

  @param  This                 Protocol instance pointer.
  @param  ControllerHandle     Handle of device to test.
  @param  RemainingDevicePath  Optional parameter use to pick a specific child
                               device to start.

  @retval EFI_SUCCESS          This driver supports this device.
  @retval EFI_UNSUPPORTED      Debug Port device is not supported.
  @retval EFI_OUT_OF_RESOURCES Fails to allocate memory for device.
  @retval others               Some error occurs.

**/
EFI_STATUS
EFIAPI
DebugPortSupported (
  IN EFI_DRIVER_BINDING_PROTOCOL    *This,
  IN EFI_HANDLE                     Controller,
  IN EFI_DEVICE_PATH_PROTOCOL       *RemainingDevicePath
  );

/**
  Binds exclusively to serial io on the controller handle, Produces DebugPort
  protocol and DevicePath on new handle.

  @param  This                 Protocol instance pointer.
  @param  ControllerHandle     Handle of device to bind driver to.
  @param  RemainingDevicePath  Optional parameter use to pick a specific child
                               device to start.

  @retval EFI_SUCCESS          This driver is added to ControllerHandle.
  @retval EFI_OUT_OF_RESOURCES Fails to allocate memory for device.
  @retval others               Some error occurs.

**/
EFI_STATUS
EFIAPI
DebugPortStart (
  IN EFI_DRIVER_BINDING_PROTOCOL    *This,
  IN EFI_HANDLE                     Controller,
  IN EFI_DEVICE_PATH_PROTOCOL       *RemainingDevicePath
  );

/**
  Stop this driver on ControllerHandle by removing Serial IO protocol on
  the ControllerHandle.

  @param  This              Protocol instance pointer.
  @param  ControllerHandle  Handle of device to stop driver on
  @param  NumberOfChildren  Number of Handles in ChildHandleBuffer. If number of
                            children is zero stop the entire bus driver.
  @param  ChildHandleBuffer List of Child Handles to Stop.

  @retval EFI_SUCCESS       This driver is removed ControllerHandle.
  @retval other             This driver was not removed from this device.

**/
EFI_STATUS
EFIAPI
DebugPortStop (
  IN  EFI_DRIVER_BINDING_PROTOCOL    *This,
  IN  EFI_HANDLE                     Controller,
  IN  UINTN                          NumberOfChildren,
  IN  EFI_HANDLE                     *ChildHandleBuffer
  );

//
// EFI Component Name Functions
//
/**
  Retrieves a Unicode string that is the user readable name of the driver.

  This function retrieves the user readable name of a driver in the form of a
  Unicode string. If the driver specified by This has a user readable name in
  the language specified by Language, then a pointer to the driver name is
  returned in DriverName, and EFI_SUCCESS is returned. If the driver specified
  by This does not support the language specified by Language,
  then EFI_UNSUPPORTED is returned.

  @param  This[in]              A pointer to the EFI_COMPONENT_NAME2_PROTOCOL or
                                EFI_COMPONENT_NAME_PROTOCOL instance.

  @param  Language[in]          A pointer to a Null-terminated ASCII string
                                array indicating the language. This is the
                                language of the driver name that the caller is
                                requesting, and it must match one of the
                                languages specified in SupportedLanguages. The
                                number of languages supported by a driver is up
                                to the driver writer. Language is specified
                                in RFC 4646 or ISO 639-2 language code format.

  @param  DriverName[out]       A pointer to the Unicode string to return.
                                This Unicode string is the name of the
                                driver specified by This in the language
                                specified by Language.

  @retval EFI_SUCCESS           The Unicode string for the Driver specified by
                                This and the language specified by Language was
                                returned in DriverName.

  @retval EFI_INVALID_PARAMETER Language is NULL.

  @retval EFI_INVALID_PARAMETER DriverName is NULL.

  @retval EFI_UNSUPPORTED       The driver specified by This does not support
                                the language specified by Language.

**/
EFI_STATUS
EFIAPI
DebugPortComponentNameGetDriverName (
  IN  EFI_COMPONENT_NAME_PROTOCOL  *This,
  IN  CHAR8                        *Language,
  OUT CHAR16                       **DriverName
  );


/**
  Retrieves a Unicode string that is the user readable name of the controller
  that is being managed by a driver.

  This function retrieves the user readable name of the controller specified by
  ControllerHandle and ChildHandle in the form of a Unicode string. If the
  driver specified by This has a user readable name in the language specified by
  Language, then a pointer to the controller name is returned in ControllerName,
  and EFI_SUCCESS is returned.  If the driver specified by This is not currently
  managing the controller specified by ControllerHandle and ChildHandle,
  then EFI_UNSUPPORTED is returned.  If the driver specified by This does not
  support the language specified by Language, then EFI_UNSUPPORTED is returned.

  @param  This[in]              A pointer to the EFI_COMPONENT_NAME2_PROTOCOL or
                                EFI_COMPONENT_NAME_PROTOCOL instance.

  @param  ControllerHandle[in]  The handle of a controller that the driver
                                specified by This is managing.  This handle
                                specifies the controller whose name is to be
                                returned.

  @param  ChildHandle[in]       The handle of the child controller to retrieve
                                the name of.  This is an optional parameter that
                                may be NULL.  It will be NULL for device
                                drivers.  It will also be NULL for a bus drivers
                                that wish to retrieve the name of the bus
                                controller.  It will not be NULL for a bus
                                driver that wishes to retrieve the name of a
                                child controller.

  @param  Language[in]          A pointer to a Null-terminated ASCII string
                                array indicating the language.  This is the
                                language of the driver name that the caller is
                                requesting, and it must match one of the
                                languages specified in SupportedLanguages. The
                                number of languages supported by a driver is up
                                to the driver writer. Language is specified in
                                RFC 4646 or ISO 639-2 language code format.

  @param  ControllerName[out]   A pointer to the Unicode string to return.
                                This Unicode string is the name of the
                                controller specified by ControllerHandle and
                                ChildHandle in the language specified by
                                Language from the point of view of the driver
                                specified by This.

  @retval EFI_SUCCESS           The Unicode string for the user readable name in
                                the language specified by Language for the
                                driver specified by This was returned in
                                DriverName.

  @retval EFI_INVALID_PARAMETER ControllerHandle is NULL.

  @retval EFI_INVALID_PARAMETER ChildHandle is not NULL and it is not a valid
                                EFI_HANDLE.

  @retval EFI_INVALID_PARAMETER Language is NULL.

  @retval EFI_INVALID_PARAMETER ControllerName is NULL.

  @retval EFI_UNSUPPORTED       The driver specified by This is not currently
                                managing the controller specified by
                                ControllerHandle and ChildHandle.

  @retval EFI_UNSUPPORTED       The driver specified by This does not support
                                the language specified by Language.

**/
EFI_STATUS
EFIAPI
DebugPortComponentNameGetControllerName (
  IN  EFI_COMPONENT_NAME_PROTOCOL                     *This,
  IN  EFI_HANDLE                                      ControllerHandle,
  IN  EFI_HANDLE                                      ChildHandle        OPTIONAL,
  IN  CHAR8                                           *Language,
  OUT CHAR16                                          **ControllerName
  );


/**
  DebugPort protocol member function.  Calls SerialIo:GetControl to flush buffer.
  We cannot call SerialIo:SetAttributes because it uses pool services, which use
  locks, which affect TPL, so it's not interrupt context safe or re-entrant.
  SerialIo:Reset() calls SetAttributes, so it can't be used either.

  The port itself should be fine since it was set up during initialization.

  @param  This              Protocol instance pointer.

  @return EFI_SUCCESS       Always.

**/
EFI_STATUS
EFIAPI
DebugPortReset (
  IN EFI_DEBUGPORT_PROTOCOL         *This
  );

/**
  DebugPort protocol member function.  Calls SerialIo:Read() after setting
  if it's different than the last SerialIo access.

  @param  This                Pointer to DebugPort protocol.
  @param  Timeout             Timeout value.
  @param  BufferSize          On input, the size of Buffer.
                              On output, the amount of data actually written.
  @param  Buffer              Pointer to buffer to read.

  @retval EFI_SUCCESS
  @retval others

**/
EFI_STATUS
EFIAPI
DebugPortRead (
  IN EFI_DEBUGPORT_PROTOCOL         *This,
  IN UINT32                         Timeout,
  IN OUT UINTN                      *BufferSize,
  IN VOID                           *Buffer
  );

/**
  DebugPort protocol member function.  Calls SerialIo:Write() Writes 8 bytes at
  a time and does a GetControl between 8 byte writes to help insure reads are
  interspersed This is poor-man's flow control.

  @param  This                Pointer to DebugPort protocol.
  @param  Timeout             Timeout value.
  @param  BufferSize          On input, the size of Buffer.
                              On output, the amount of data actually written.
  @param  Buffer              Pointer to buffer to read.

  @retval EFI_SUCCESS         The data was written.
  @retval others              Fails when writting datas to debug port device.

**/
EFI_STATUS
EFIAPI
DebugPortWrite (
  IN EFI_DEBUGPORT_PROTOCOL         *This,
  IN UINT32                         Timeout,
  IN OUT UINTN                      *BufferSize,
  OUT VOID                          *Buffer
  );

/**
  DebugPort protocol member function.  Calls SerialIo:Write() after setting
  if it's different than the last SerialIo access.

  @param  This                Pointer to DebugPort protocol.

  @retval EFI_SUCCESS         At least 1 character is ready to be read from
                              the DebugPort interface.
  @retval EFI_NOT_READY       There are no characters ready to read from the
                              DebugPort interface
  @retval EFI_DEVICE_ERROR    A hardware failure occurred... (from SerialIo)

**/
EFI_STATUS
EFIAPI
DebugPortPoll (
  IN EFI_DEBUGPORT_PROTOCOL         *This
  );

#endif