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 - 2018, Intel Corporation. All rights reserved.<BR>
   7   SPDX-License-Identifier: BSD-2-Clause-Patent
   8
   9   @par Revision Reference:
  10   This PPI is introduced in PI Version 1.0.
  11
  12 **/
  13
  14 #ifndef __PEI_SMBUS2_PPI_H__
  15 #define __PEI_SMBUS2_PPI_H__
  16
  17 #include <IndustryStandard/SmBus.h>
  18
  19 #define EFI_PEI_SMBUS2_PPI_GUID \
  20   { 0x9ca93627, 0xb65b, 0x4324, { 0xa2, 0x2, 0xc0, 0xb4, 0x61, 0x76, 0x45, 0x43 } }
  21
  22 typedef struct _EFI_PEI_SMBUS2_PPI EFI_PEI_SMBUS2_PPI;
  23
  24 /**
  25   Executes an SMBus operation to an SMBus controller. Returns when either
  26   the command has been executed or an error is encountered in doing the operation.
  27
  28   @param  This            A pointer to the EFI_PEI_SMBUS2_PPI instance.
  29   @param  SlaveAddress    The SMBUS hardware address to which the SMBUS device is preassigned or
  30                           allocated.
  31   @param  Command         This command is transmitted by the SMBus host controller to the SMBus slave
  32                           device and the interpretation is SMBus slave device specific.
  33                           It can mean the offset to a list of functions inside
  34                           an SMBus slave device. Not all operations or slave devices support
  35                           this command's registers.
  36   @param  Operation       Signifies which particular SMBus hardware protocol instance that it
  37                           will use to execute the SMBus transactions.
  38                           This SMBus hardware protocol is defined by the System Management Bus (SMBus)
  39                           Specification and is not related to UEFI.
  40   @param  PecCheck        Defines if Packet Error Code (PEC) checking is required for this operation.
  41   @param  Length          Signifies the number of bytes that this operation will do.
  42                           The maximum number of bytes can be revision specific and operation specific.
  43                           This parameter will contain the actual number of bytes that are executed
  44                           for this operation. Not all operations require this argument.
  45   @param  Buffer          Contains the value of data to execute to the SMBus slave device.
  46                           Not all operations require this argument.
  47                           The length of this buffer is identified by Length.
  48
  49
  50   @retval EFI_SUCCESS           The last data that was returned from the access
  51                                 matched the poll exit criteria.
  52   @retval EFI_CRC_ERROR         The checksum is not correct (PEC is incorrect)
  53   @retval EFI_TIMEOUT           Timeout expired before the operation was completed.
  54                                 Timeout is determined by the SMBus host controller device.
  55   @retval EFI_OUT_OF_RESOURCES  The request could not be completed
  56                                 due to a lack of resources.
  57   @retval EFI_DEVICE_ERROR      The request was not completed because
  58                                 a failure reflected in the Host Status Register bit.
  59   @retval EFI_INVALID_PARAMETER Operation is not defined in EFI_SMBUS_OPERATION.
  60                                 Or Length/Buffer is NULL for operations except for EfiSmbusQuickRead and
  61                                 EfiSmbusQuickWrite. Or Length is outside the range of valid values.
  62   @retval EFI_UNSUPPORTED       The SMBus operation or PEC is not supported.
  63   @retval EFI_BUFFER_TOO_SMALL  Buffer is not sufficient for this operation.
  64
  65 **/
  66 typedef
  67 EFI_STATUS
  68 (EFIAPI *EFI_PEI_SMBUS2_PPI_EXECUTE_OPERATION)(
  69   IN CONST  EFI_PEI_SMBUS2_PPI        *This,
  70   IN        EFI_SMBUS_DEVICE_ADDRESS  SlaveAddress,
  71   IN        EFI_SMBUS_DEVICE_COMMAND  Command,
  72   IN        EFI_SMBUS_OPERATION       Operation,
  73   IN        BOOLEAN                   PecCheck,
  74   IN OUT    UINTN                     *Length,
  75   IN OUT    VOID                      *Buffer
  76   );
  77
  78 /**
  79   The ArpDevice() function enumerates the entire bus or enumerates a specific
  80   device that is identified by SmbusUdid.
  81
  82   @param  This           A pointer to the EFI_PEI_SMBUS2_PPI instance.
  83   @param  ArpAll         A Boolean expression that indicates if the host drivers need
  84                          to enumerate all the devices or enumerate only the device that is identified
  85                          by SmbusUdid. If ArpAll is TRUE, SmbusUdid and SlaveAddress are optional.
  86                          If ArpAll is FALSE, ArpDevice will enumerate SmbusUdid and the address
  87                          will be at SlaveAddress.
  88   @param  SmbusUdid      The targeted SMBus Unique Device Identifier (UDID).
  89                          The UDID may not exist for SMBus devices with fixed addresses.
  90   @param  SlaveAddress   The new SMBus address for the slave device for
  91                          which the operation is targeted.
  92
  93   @retval EFI_SUCCESS           The SMBus slave device address was set.
  94   @retval EFI_INVALID_PARAMETER SlaveAddress is NULL.
  95   @retval EFI_OUT_OF_RESOURCES  The request could not be completed
  96                                 due to a lack of resources.
  97   @retval EFI_TIMEOUT           The SMBus slave device did not respond.
  98   @retval EFI_DEVICE_ERROR      The request was not completed because the transaction failed.
  99   @retval EFI_UNSUPPORTED       ArpDevice, GetArpMap, and Notify are not implemented by this PEIM.
 100
 101 **/
 102 typedef
 103 EFI_STATUS
 104 (EFIAPI *EFI_PEI_SMBUS2_PPI_ARP_DEVICE)(
 105   IN CONST  EFI_PEI_SMBUS2_PPI        *This,
 106   IN        BOOLEAN                   ArpAll,
 107   IN        EFI_SMBUS_UDID            *SmbusUdid    OPTIONAL,
 108   IN OUT    EFI_SMBUS_DEVICE_ADDRESS  *SlaveAddress OPTIONAL
 109   );
 110
 111 /**
 112   The GetArpMap() function returns the mapping of all the SMBus devices
 113   that are enumerated by the SMBus host driver.
 114
 115   @param  This           A pointer to the EFI_PEI_SMBUS2_PPI instance.
 116   @param  Length         Size of the buffer that contains the SMBus device map.
 117   @param  SmbusDeviceMap The pointer to the device map as enumerated
 118                          by the SMBus controller driver.
 119
 120   @retval EFI_SUCCESS           The device map was returned correctly in the buffer.
 121   @retval EFI_UNSUPPORTED       ArpDevice, GetArpMap, and Notify are not implemented by this PEIM.
 122
 123 **/
 124 typedef
 125 EFI_STATUS
 126 (EFIAPI *EFI_PEI_SMBUS2_PPI_GET_ARP_MAP)(
 127   IN CONST  EFI_PEI_SMBUS2_PPI    *This,
 128   IN OUT    UINTN                 *Length,
 129   IN OUT    EFI_SMBUS_DEVICE_MAP  **SmbusDeviceMap
 130   );
 131
 132 /**
 133   CallBack function can be registered in EFI_PEI_SMBUS2_PPI_NOTIFY.
 134
 135   @param  This           A pointer to the EFI_PEI_SMBUS2_PPI instance.
 136   @param  SlaveAddress   The SMBUS hardware address to which the SMBUS
 137                          device is preassigned or allocated.
 138   @param  Data           Data of the SMBus host notify command that
 139                          the caller wants to be called.
 140
 141   @retval EFI_SUCCESS           NotifyFunction has been registered.
 142   @retval EFI_UNSUPPORTED       ArpDevice, GetArpMap, and Notify are not
 143                                 implemented by this PEIM.
 144
 145 **/
 146 typedef
 147 EFI_STATUS
 148 (EFIAPI *EFI_PEI_SMBUS_NOTIFY2_FUNCTION)(
 149   IN CONST  EFI_PEI_SMBUS2_PPI        *SmbusPpi,
 150   IN        EFI_SMBUS_DEVICE_ADDRESS  SlaveAddress,
 151   IN        UINTN                     Data
 152   );
 153
 154 /**
 155   The Notify() function registers all the callback functions to allow the
 156   bus driver to call these functions when the SlaveAddress/Data pair happens.
 157
 158   @param  This           A pointer to the EFI_PEI_SMBUS2_PPI instance.
 159   @param  SlaveAddress   Address that the host controller detects as
 160                          sending a message and calls all the registered functions.
 161   @param  Data           Data that the host controller detects as sending a message
 162                          and calls all the registered functions.
 163   @param  NotifyFunction The function to call when the bus driver
 164                          detects the SlaveAddress and Data pair.
 165
 166   @retval EFI_SUCCESS     NotifyFunction has been registered.
 167   @retval EFI_UNSUPPORTED ArpDevice, GetArpMap, and Notify are not
 168                           implemented by this PEIM.
 169 **/
 170 typedef
 171 EFI_STATUS
 172 (EFIAPI *EFI_PEI_SMBUS2_PPI_NOTIFY)(
 173   IN CONST EFI_PEI_SMBUS2_PPI              *This,
 174   IN       EFI_SMBUS_DEVICE_ADDRESS        SlaveAddress,
 175   IN       UINTN                           Data,
 176   IN       EFI_PEI_SMBUS_NOTIFY2_FUNCTION  NotifyFunction
 177   );
 178
 179 ///
 180 ///  Provides the basic I/O interfaces that a PEIM uses to access
 181 ///  its SMBus controller and the slave devices attached to it.
 182 ///
 183 struct _EFI_PEI_SMBUS2_PPI {
 184   EFI_PEI_SMBUS2_PPI_EXECUTE_OPERATION    Execute;
 185   EFI_PEI_SMBUS2_PPI_ARP_DEVICE           ArpDevice;
 186   EFI_PEI_SMBUS2_PPI_GET_ARP_MAP          GetArpMap;
 187   EFI_PEI_SMBUS2_PPI_NOTIFY               Notify;
 188   ///
 189   /// Identifier which uniquely identifies this SMBus controller in a system.
 190   ///
 191   EFI_GUID                                Identifier;
 192 };
 193
 194 extern EFI_GUID  gEfiPeiSmbus2PpiGuid;
 195
 196 #endif