smbuslib.c

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/*++

Copyright (c) 2004 - 2006, Intel Corporation                                                         
All rights reserved. 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.              


Module Name:

  PeiSmbus.c
  
Abstract: 

  Pei Smbus Lib Interfaces

--*/

#include "PeiSmbusLibInternal.h"

/**
  Executes an SMBUS quick read command.

  Executes an SMBUS quick read command on the SMBUS device specified by SmBusAddress.
  Only the SMBUS slave address field of SmBusAddress is required.
  If Status is not NULL, then the status of the executed command is returned in Status.
  If PEC is set in SmBusAddress, then ASSERT().
  If Command in SmBusAddress is not zero, then ASSERT().
  If Length in SmBusAddress is not zero, then ASSERT().
  If any reserved bits of SmBusAddress are set, then ASSERT().

  @param  SmBusAddress    Address that encodes the SMBUS Slave Address,
                          SMBUS Command, SMBUS Data Length, and PEC.
  @param  Status          Return status for the executed command.
                          This is an optional parameter and may be NULL.

**/
VOID
EFIAPI
SmBusQuickRead (
  IN  UINTN                     SmBusAddress,
  OUT RETURN_STATUS             *Status       OPTIONAL
  )
{
  ASSERT (!SMBUS_LIB_PEC (SmBusAddress));
  ASSERT (SMBUS_LIB_COMMAND (SmBusAddress)   == 0);
  ASSERT (SMBUS_LIB_LENGTH (SmBusAddress)    == 0);
  ASSERT (SMBUS_LIB_RESEARVED (SmBusAddress) == 0);

  InternalSmBusExec (EfiSmbusQuickRead, SmBusAddress, 0, NULL, Status);
}

/**
  Executes an SMBUS quick write command.

  Executes an SMBUS quick write command on the SMBUS device specified by SmBusAddress.
  Only the SMBUS slave address field of SmBusAddress is required.
  If Status is not NULL, then the status of the executed command is returned in Status.
  If PEC is set in SmBusAddress, then ASSERT().
  If Command in SmBusAddress is not zero, then ASSERT().
  If Length in SmBusAddress is not zero, then ASSERT().
  If any reserved bits of SmBusAddress are set, then ASSERT().

  @param  SmBusAddress    Address that encodes the SMBUS Slave Address,
                          SMBUS Command, SMBUS Data Length, and PEC.
  @param  Status          Return status for the executed command.
                          This is an optional parameter and may be NULL.

**/
VOID
EFIAPI
SmBusQuickWrite (
  IN  UINTN                     SmBusAddress,
  OUT RETURN_STATUS             *Status       OPTIONAL
  )
{
  ASSERT (!SMBUS_LIB_PEC (SmBusAddress));
  ASSERT (SMBUS_LIB_COMMAND (SmBusAddress)   == 0);
  ASSERT (SMBUS_LIB_LENGTH (SmBusAddress)    == 0);
  ASSERT (SMBUS_LIB_RESEARVED (SmBusAddress) == 0);

  InternalSmBusExec (EfiSmbusQuickWrite, SmBusAddress, 0, NULL, Status);
}

/**
  Executes an SMBUS receive byte command.

  Executes an SMBUS receive byte command on the SMBUS device specified by SmBusAddress.
  Only the SMBUS slave address field of SmBusAddress is required.
  The byte received from the SMBUS is returned.
  If Status is not NULL, then the status of the executed command is returned in Status.
  If Command in SmBusAddress is not zero, then ASSERT().
  If Length in SmBusAddress is not zero, then ASSERT().
  If any reserved bits of SmBusAddress are set, then ASSERT().

  @param  SmBusAddress    Address that encodes the SMBUS Slave Address,
                          SMBUS Command, SMBUS Data Length, and PEC.
  @param  Status          Return status for the executed command.
                          This is an optional parameter and may be NULL.

  @return The byte received from the SMBUS.

**/
UINT8
EFIAPI
SmBusReceiveByte (
  IN  UINTN          SmBusAddress,
  OUT RETURN_STATUS  *Status        OPTIONAL
  )
{
  UINT8   Byte;

  ASSERT (SMBUS_LIB_COMMAND (SmBusAddress) == 0);
  ASSERT (SMBUS_LIB_LENGTH (SmBusAddress)  == 0);
  ASSERT (SMBUS_LIB_RESEARVED (SmBusAddress) == 0);

  InternalSmBusExec (EfiSmbusReceiveByte, SmBusAddress, 1, &Byte, Status);

  return Byte;
}

/**
  Executes an SMBUS send byte command.

  Executes an SMBUS send byte command on the SMBUS device specified by SmBusAddress.
  The byte specified by Value is sent.
  Only the SMBUS slave address field of SmBusAddress is required.  Value is returned.
  If Status is not NULL, then the status of the executed command is returned in Status.
  If Command in SmBusAddress is not zero, then ASSERT().
  If Length in SmBusAddress is not zero, then ASSERT().
  If any reserved bits of SmBusAddress are set, then ASSERT().

  @param  SmBusAddress    Address that encodes the SMBUS Slave Address,
                          SMBUS Command, SMBUS Data Length, and PEC.
  @param  Value           The 8-bit value to send.
  @param  Status          Return status for the executed command.
                          This is an optional parameter and may be NULL.

  @return The parameter of Value.

**/
UINT8
EFIAPI
SmBusSendByte (
  IN  UINTN          SmBusAddress,
  IN  UINT8          Value,
  OUT RETURN_STATUS  *Status        OPTIONAL
  )
{
  UINT8   Byte;

  ASSERT (SMBUS_LIB_COMMAND (SmBusAddress)   == 0);
  ASSERT (SMBUS_LIB_LENGTH (SmBusAddress)    == 0);
  ASSERT (SMBUS_LIB_RESEARVED (SmBusAddress) == 0);

  Byte   = Value;
  InternalSmBusExec (EfiSmbusSendByte, SmBusAddress, 1, &Byte, Status);

  return Value;
}

/**
  Executes an SMBUS read data byte command.

  Executes an SMBUS read data byte command on the SMBUS device specified by SmBusAddress.
  Only the SMBUS slave address and SMBUS command fields of SmBusAddress are required.
  The 8-bit value read from the SMBUS is returned.
  If Status is not NULL, then the status of the executed command is returned in Status.
  If Length in SmBusAddress is not zero, then ASSERT().
  If any reserved bits of SmBusAddress are set, then ASSERT().

  @param  SmBusAddress    Address that encodes the SMBUS Slave Address,
                          SMBUS Command, SMBUS Data Length, and PEC.
  @param  Status          Return status for the executed command.
                          This is an optional parameter and may be NULL.

  @return The byte read from the SMBUS.

**/
UINT8
EFIAPI
SmBusReadDataByte (
  IN  UINTN          SmBusAddress,
  OUT RETURN_STATUS  *Status        OPTIONAL
  )
{
  UINT8   Byte;

  ASSERT (SMBUS_LIB_LENGTH (SmBusAddress)    == 0);
  ASSERT (SMBUS_LIB_RESEARVED (SmBusAddress) == 0);

  InternalSmBusExec (EfiSmbusReadByte, SmBusAddress, 1, &Byte, Status);
  
  return Byte;
}

/**
  Executes an SMBUS write data byte command.

  Executes an SMBUS write data byte command on the SMBUS device specified by SmBusAddress.
  The 8-bit value specified by Value is written.
  Only the SMBUS slave address and SMBUS command fields of SmBusAddress are required.
  Value is returned.
  If Status is not NULL, then the status of the executed command is returned in Status.
  If Length in SmBusAddress is not zero, then ASSERT().
  If any reserved bits of SmBusAddress are set, then ASSERT().

  @param  SmBusAddress    Address that encodes the SMBUS Slave Address,
                          SMBUS Command, SMBUS Data Length, and PEC.
  @param  Value           The 8-bit value to write.
  @param  Status          Return status for the executed command.
                          This is an optional parameter and may be NULL.

  @return The parameter of Value.

**/
UINT8
EFIAPI
SmBusWriteDataByte (
  IN  UINTN          SmBusAddress,
  IN  UINT8          Value,
  OUT RETURN_STATUS  *Status        OPTIONAL
  )
{
  UINT8   Byte;

  ASSERT (SMBUS_LIB_LENGTH (SmBusAddress)    == 0);
  ASSERT (SMBUS_LIB_RESEARVED (SmBusAddress) == 0);

  Byte = Value;
  InternalSmBusExec (EfiSmbusWriteByte, SmBusAddress, 1, &Byte, Status);
  
  return Value;
}