ArmPlatformPkg/Library/PL011SerialPortLib/PL011SerialPortLib.c

   1 /** @file
   2   Serial I/O Port library functions with no library constructor/destructor
   3
   4   Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
   5   Copyright (c) 2012, ARM Ltd. All rights reserved.<BR>
   6
   7   This program and the accompanying materials
   8   are licensed and made available under the terms and conditions of the BSD License
   9   which accompanies this distribution.  The full text of the license may be found at
  10   http://opensource.org/licenses/bsd-license.php
  11
  12   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  13   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  14
  15 **/
  16
  17 #include <Base.h>
  18
  19 #include <Library/IoLib.h>
  20 #include <Library/PcdLib.h>
  21 #include <Library/SerialPortLib.h>
  22 #include <Library/SerialPortExtLib.h>
  23
  24 #include <Drivers/PL011Uart.h>
  25
  26
  27 /**
  28
  29   Programmed hardware of Serial port.
  30
  31   @return    Always return RETURN_UNSUPPORTED.
  32
  33 **/
  34 RETURN_STATUS
  35 EFIAPI
  36 SerialPortInitialize (
  37   VOID
  38   )
  39 {
  40   return PL011UartInitializePort (
  41       (UINTN)PcdGet64 (PcdSerialRegisterBase),
  42       (UINTN)PcdGet64 (PcdUartDefaultBaudRate),
  43       0, // Use the default value for Fifo depth
  44       (EFI_PARITY_TYPE)PcdGet8 (PcdUartDefaultParity),
  45       PcdGet8 (PcdUartDefaultDataBits),
  46       (EFI_STOP_BITS_TYPE) PcdGet8 (PcdUartDefaultStopBits));
  47 }
  48
  49 /**
  50   Write data to serial device.
  51
  52   @param  Buffer           Point of data buffer which need to be written.
  53   @param  NumberOfBytes    Number of output bytes which are cached in Buffer.
  54
  55   @retval 0                Write data failed.
  56   @retval !0               Actual number of bytes written to serial device.
  57
  58 **/
  59 UINTN
  60 EFIAPI
  61 SerialPortWrite (
  62   IN UINT8     *Buffer,
  63   IN UINTN     NumberOfBytes
  64   )
  65 {
  66   return PL011UartWrite ((UINTN)PcdGet64 (PcdSerialRegisterBase), Buffer, NumberOfBytes);
  67 }
  68
  69 /**
  70   Read data from serial device and save the data in buffer.
  71
  72   @param  Buffer           Point of data buffer which need to be written.
  73   @param  NumberOfBytes    Number of output bytes which are cached in Buffer.
  74
  75   @retval 0                Read data failed.
  76   @retval !0               Actual number of bytes read from serial device.
  77
  78 **/
  79 UINTN
  80 EFIAPI
  81 SerialPortRead (
  82   OUT UINT8     *Buffer,
  83   IN  UINTN     NumberOfBytes
  84 )
  85 {
  86   return PL011UartRead ((UINTN)PcdGet64 (PcdSerialRegisterBase), Buffer, NumberOfBytes);
  87 }
  88
  89 /**
  90   Check to see if any data is available to be read from the debug device.
  91
  92   @retval EFI_SUCCESS       At least one byte of data is available to be read
  93   @retval EFI_NOT_READY     No data is available to be read
  94   @retval EFI_DEVICE_ERROR  The serial device is not functioning properly
  95
  96 **/
  97 BOOLEAN
  98 EFIAPI
  99 SerialPortPoll (
 100   VOID
 101   )
 102 {
 103   return PL011UartPoll ((UINTN)PcdGet64 (PcdSerialRegisterBase));
 104 }
 105
 106 /**
 107   Set new attributes to PL011.
 108
 109   @param  BaudRate                The baud rate of the serial device. If the baud rate is not supported,
 110                                   the speed will be reduced down to the nearest supported one and the
 111                                   variable's value will be updated accordingly.
 112   @param  ReceiveFifoDepth        The number of characters the device will buffer on input. If the specified
 113                                   value is not supported, the variable's value will be reduced down to the
 114                                   nearest supported one.
 115   @param  Timeout                 If applicable, the number of microseconds the device will wait
 116                                   before timing out a Read or a Write operation.
 117   @param  Parity                  If applicable, this is the EFI_PARITY_TYPE that is computer or checked
 118                                   as each character is transmitted or received. If the device does not
 119                                   support parity, the value is the default parity value.
 120   @param  DataBits                The number of data bits in each character
 121   @param  StopBits                If applicable, the EFI_STOP_BITS_TYPE number of stop bits per character.
 122                                   If the device does not support stop bits, the value is the default stop
 123                                   bit value.
 124
 125   @retval EFI_SUCCESS             All attributes were set correctly on the serial device.
 126   @retval EFI_INVALID_PARAMETERS  One or more of the attributes has an unsupported value.
 127
 128 **/
 129 RETURN_STATUS
 130 EFIAPI
 131 SerialPortSetAttributes (
 132   IN UINT64              BaudRate,
 133   IN UINT32              ReceiveFifoDepth,
 134   IN UINT32              Timeout,
 135   IN EFI_PARITY_TYPE     Parity,
 136   IN UINT8               DataBits,
 137   IN EFI_STOP_BITS_TYPE  StopBits
 138   )
 139 {
 140   return PL011UartInitializePort (
 141         (UINTN)PcdGet64 (PcdSerialRegisterBase),
 142         BaudRate,
 143         ReceiveFifoDepth,
 144         Parity,
 145         DataBits,
 146         StopBits);
 147 }
 148
 149 /**
 150   Set the serial device control bits.
 151
 152   @param  Control                 Control bits which are to be set on the serial device.
 153
 154   @retval EFI_SUCCESS             The new control bits were set on the serial device.
 155   @retval EFI_UNSUPPORTED         The serial device does not support this operation.
 156   @retval EFI_DEVICE_ERROR        The serial device is not functioning correctly.
 157
 158 **/
 159 RETURN_STATUS
 160 EFIAPI
 161 SerialPortSetControl (
 162   IN UINT32                  Control
 163   )
 164 {
 165   return PL011UartSetControl((UINTN)PcdGet64 (PcdSerialRegisterBase), Control);
 166 }
 167
 168 /**
 169   Get the serial device control bits.
 170
 171   @param  Control                 Control signals read from the serial device.
 172
 173   @retval EFI_SUCCESS             The control bits were read from the serial device.
 174   @retval EFI_DEVICE_ERROR        The serial device is not functioning correctly.
 175
 176 **/
 177 RETURN_STATUS
 178 EFIAPI
 179 SerialPortGetControl (
 180   OUT UINT32                  *Control
 181   )
 182 {
 183   return PL011UartGetControl((UINTN)PcdGet64 (PcdSerialRegisterBase), Control);
 184 }