MdePkg/Include/Ppi/Smbus2.h

   1 /** @file
   2   This file declares Smbus2 PPI.
   3   This PPI provides the basic I/O interfaces that a PEIM uses to access its
   4   SMBus controller and the slave devices attached to it.
   5
   6   Copyright (c) 2006 - 2008, Intel Corporation
   7   All rights reserved. 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   @par Revision Reference:
  16   This PPI is defined in PI.
  17   Version 1.00
  18
  19 **/
  20
  21 #ifndef __PEI_SMBUS2_PPI_H__
  22 #define __PEI_SMBUS2_PPI_H__
  23
  24 #include <IndustryStandard/SmBus.h>
  25
  26 #define EFI_PEI_SMBUS2_PPI_GUID \
  27   { 0x9ca93627, 0xb65b, 0x4324, { 0xa2, 0x2, 0xc0, 0xb4, 0x61, 0x76, 0x45, 0x43 } }
  28
  29
  30 typedef struct _EFI_PEI_SMBUS2_PPI EFI_PEI_SMBUS2_PPI;
  31
  32 //
  33 // EFI_SMBUS_DEVICE_COMMAND
  34 //
  35 typedef UINTN   EFI_SMBUS_DEVICE_COMMAND;
  36
  37
  38 /*
  39   Executes an SMBus operation to an SMBus controller. Returns when either
  40   the command has been executed or an error is encountered in doing the operation.
  41
  42   @param  This            A pointer to the EFI_PEI_SMBUS2_PPI instance.
  43   @param  SlaveAddress    The SMBUS hardware address to which the SMBUS device is preassigned or
  44                           allocated.
  45   @param  Command         This command is transmitted by the SMBus host controller to the SMBus slave
  46                           device and the interpretation is SMBus slave device specific.
  47                           It can mean the offset to a list of functions inside
  48                           an SMBus slave device. Not all operations or slave devices support
  49                           this command's registers.
  50   @param  Operation       Signifies which particular SMBus hardware protocol instance that it
  51                           will use to execute the SMBus transactions.
  52                           This SMBus hardware protocol is defined by the System Management Bus (SMBus)
  53                           Specification and is not related to UEFI.
  54   @param  PecCheck        Defines if Packet Error Code (PEC) checking is required for this operation.
  55   @param  Length          Signifies the number of bytes that this operation will do.
  56                           The maximum number of bytes can be revision specific and operation specific.
  57                           This parameter will contain the actual number of bytes that are executed
  58                           for this operation. Not all operations require this argument.
  59   @param  Buffer          Contains the value of data to execute to the SMBus slave device.
  60                           Not all operations require this argument.
  61                           The length of this buffer is identified by Length.
  62
  63
  64   @retval EFI_SUCCESS           The last data that was returned from the access
  65                                 matched the poll exit criteria.
  66   @retval EFI_CRC_ERROR         The checksum is not correct (PEC is incorrect)
  67   @retval EFI_TIMEOUT           Timeout expired before the operation was completed.
  68                                 Timeout is determined by the SMBus host controller device.
  69   @retval EFI_OUT_OF_RESOURCES  The request could not be completed
  70                                 due to a lack of resources.
  71   @retval EFI_DEVICE_ERROR      The request was not completed because
  72                                 a failure reflected in the Host Status Register bit.
  73   @retval EFI_INVALID_PARAMETER Operation is not defined in EFI_SMBUS_OPERATION.
  74                                 Or Length/Buffer is NULL for operations except for EfiSmbusQuickRead and
  75                                 EfiSmbusQuickWrite. Or Length is outside the range of valid values.
  76   @retval EFI_UNSUPPORTED       The SMBus operation or PEC is not supported.
  77   @retval EFI_BUFFER_TOO_SMALL  Buffer is not sufficient for this operation.
  78
  79 **/
  80 typedef
  81 EFI_STATUS
  82 (EFIAPI *EFI_PEI_SMBUS2_PPI_EXECUTE_OPERATION)(
  83   IN CONST  EFI_PEI_SMBUS2_PPI        *This,
  84   IN        EFI_SMBUS_DEVICE_ADDRESS  SlaveAddress,
  85   IN        EFI_SMBUS_DEVICE_COMMAND  Command,
  86   IN        EFI_SMBUS_OPERATION       Operation,
  87   IN        BOOLEAN                   PecCheck,
  88   IN OUT    UINTN                     *Length,
  89   IN OUT    VOID                      *Buffer
  90 );
  91
  92 /**
  93   The ArpDevice() function enumerates the entire bus or enumerates a specific
  94   device that is identified by SmbusUdid.
  95
  96   @param  This           A pointer to the EFI_PEI_SMBUS2_PPI instance.
  97   @param  ArpAll         A Boolean expression that indicates if the host drivers need
  98                          to enumerate all the devices or enumerate only the device that is identified
  99                          by SmbusUdid. If ArpAll is TRUE, SmbusUdid and SlaveAddress are optional.
 100                          If ArpAll is FALSE, ArpDevice will enumerate SmbusUdid and the address
 101                          will be at SlaveAddress.
 102   @param  SmbusUdid      The targeted SMBus Unique Device Identifier (UDID).
 103                          The UDID may not exist for SMBus devices with fixed addresses.
 104   @param  SlaveAddress   The new SMBus address for the slave device for
 105                          which the operation is targeted.
 106
 107   @retval EFI_SUCCESS           The SMBus slave device address was set.
 108   @retval EFI_INVALID_PARAMETER SlaveAddress is NULL.
 109   @retval EFI_OUT_OF_RESOURCES  The request could not be completed
 110                                 due to a lack of resources.
 111   @retval EFI_TIMEOUT           The SMBus slave device did not respond.
 112   @retval EFI_DEVICE_ERROR      The request was not completed because the transaction failed.
 113   @retval EFI_UNSUPPORTED       ArpDevice, GetArpMap, and Notify are not implemented by this PEIM.
 114
 115 **/
 116 typedef
 117 EFI_STATUS
 118 (EFIAPI *EFI_PEI_SMBUS2_PPI_ARP_DEVICE)(
 119   IN CONST  EFI_PEI_SMBUS2_PPI        *This,
 120   IN        BOOLEAN                   ArpAll,
 121   IN        EFI_SMBUS_UDID            *SmbusUdid,   OPTIONAL
 122   IN OUT    EFI_SMBUS_DEVICE_ADDRESS  *SlaveAddress OPTIONAL
 123 );
 124
 125
 126 typedef struct {
 127   ///
 128   /// The SMBUS hardware address to which the SMBUS device is preassigned or
 129   /// allocated. Type EFI_SMBUS_DEVICE_ADDRESS is defined in EFI_PEI_SMBUS2_PPI.Execute().
 130   ///
 131   EFI_SMBUS_DEVICE_ADDRESS  SmbusDeviceAddress;
 132   ///
 133   /// The SMBUS Unique Device Identifier (UDID) as defined in EFI_SMBUS_UDID.
 134   /// Type EFI_SMBUS_UDID is defined in EFI_PEI_SMBUS2_PPI.ArpDevice().
 135   ///
 136   EFI_SMBUS_UDID            SmbusDeviceUdid;
 137 } EFI_SMBUS_DEVICE_MAP;
 138
 139 /**
 140   The GetArpMap() function returns the mapping of all the SMBus devices
 141   that are enumerated by the SMBus host driver.
 142
 143   @param  This           A pointer to the EFI_PEI_SMBUS2_PPI instance.
 144   @param  Length         Size of the buffer that contains the SMBus device map.
 145   @param  SmbusDeviceMap The pointer to the device map as enumerated
 146                          by the SMBus controller driver.
 147
 148   @retval EFI_SUCCESS           The device map was returned correctly in the buffer.
 149   @retval EFI_UNSUPPORTED       ArpDevice, GetArpMap, and Notify are not implemented by this PEIM.
 150
 151 **/
 152 typedef
 153 EFI_STATUS
 154 (EFIAPI *EFI_PEI_SMBUS2_PPI_GET_ARP_MAP)(
 155   IN CONST  EFI_PEI_SMBUS2_PPI    *This,
 156   IN OUT    UINTN                 *Length,
 157   IN OUT    EFI_SMBUS_DEVICE_MAP  **SmbusDeviceMap
 158 );
 159
 160 /**
 161   CallBack function can be registered in EFI_PEI_SMBUS2_PPI_NOTIFY.
 162
 163   @param  This           A pointer to the EFI_PEI_SMBUS2_PPI instance.
 164   @param  SlaveAddress   The SMBUS hardware address to which the SMBUS
 165                          device is preassigned or allocated.
 166   @param  Data           Data of the SMBus host notify command that
 167                          the caller wants to be called.
 168
 169   @retval EFI_SUCCESS           NotifyFunction has been registered.
 170   @retval EFI_UNSUPPORTED       ArpDevice, GetArpMap, and Notify are not
 171                                 implemented by this PEIM.
 172
 173 **/
 174 typedef
 175 EFI_STATUS
 176 (EFIAPI *EFI_PEI_SMBUS_NOTIFY2_FUNCTION)(
 177   IN CONST  EFI_PEI_SMBUS2_PPI        *SmbusPpi,
 178   IN        EFI_SMBUS_DEVICE_ADDRESS  SlaveAddress,
 179   IN        UINTN                     Data
 180 );
 181
 182 /**
 183   The Notify() function registers all the callback functions to allow the
 184   bus driver to call these functions when the SlaveAddress/Data pair happens.
 185
 186   @param  This           A pointer to the EFI_PEI_SMBUS2_PPI instance.
 187   @param  SlaveAddress   Address that the host controller detects as
 188                          sending a message and calls all the registered functions.
 189   @param  Data           Data that the host controller detects as sending a message
 190                          and calls all the registered functions.
 191   @param  NotifyFunction The function to call when the bus driver
 192                          detects the SlaveAddress and Data pair.
 193
 194   @retval EFI_SUCCESS     NotifyFunction has been registered.
 195   @retval EFI_UNSUPPORTED ArpDevice, GetArpMap, and Notify are not
 196                           implemented by this PEIM.
 197 **/
 198 typedef
 199 EFI_STATUS
 200 (EFIAPI *EFI_PEI_SMBUS2_PPI_NOTIFY)(
 201   IN CONST EFI_PEI_SMBUS2_PPI              *This,
 202   IN       EFI_SMBUS_DEVICE_ADDRESS        SlaveAddress,
 203   IN       UINTN                           Data,
 204   IN       EFI_PEI_SMBUS_NOTIFY2_FUNCTION  NotifyFunction
 205 );
 206
 207 ///
 208 ///  Provides the basic I/O interfaces that a PEIM uses to access
 209 ///  its SMBus controller and the slave devices attached to it.
 210 ///
 211 struct _EFI_PEI_SMBUS2_PPI {
 212   EFI_PEI_SMBUS2_PPI_EXECUTE_OPERATION  Execute;
 213   EFI_PEI_SMBUS2_PPI_ARP_DEVICE         ArpDevice;
 214   EFI_PEI_SMBUS2_PPI_GET_ARP_MAP        GetArpMap;
 215   EFI_PEI_SMBUS2_PPI_NOTIFY             Notify;
 216   ///
 217   /// Identifier which uniquely identifies this SMBus controller in a system.
 218   ///
 219   EFI_GUID                              Identifier;
 220 };
 221
 222 extern EFI_GUID gEfiPeiSmbus2PpiGuid;
 223
 224 #endif