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/** @file
This file declares Smbus2 PPI.
This PPI provides the basic I/O interfaces that a PEIM uses to access its
SMBus controller and the slave devices attached to it.
Copyright (c) 2006 - 2008, 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.
@par Revision Reference:
This PPI is defined in PI.
Version 1.00
**/
#ifndef __PEI_SMBUS2_PPI_H__
#define __PEI_SMBUS2_PPI_H__
#include <PiPei.h>
#include <IndustryStandard/SmBus.h>
#define EFI_PEI_SMBUS2_PPI_GUID \
{ 0x9ca93627, 0xb65b, 0x4324, { 0xa2, 0x2, 0xc0, 0xb4, 0x61, 0x76, 0x45, 0x43 } }
typedef struct _EFI_PEI_SMBUS2_PPI EFI_PEI_SMBUS2_PPI;
//
// EFI_SMBUS_DEVICE_COMMAND
//
typedef UINTN EFI_SMBUS_DEVICE_COMMAND;
/*
Executes an SMBus operation to an SMBus controller. Returns when either
the command has been executed or an error is encountered in doing the operation.
@param This A pointer to the EFI_PEI_SMBUS2_PPI instance.
@param SlaveAddress The SMBUS hardware address to which the SMBUS device is preassigned or
allocated.
@param Command This command is transmitted by the SMBus host controller to the SMBus slave
device and the interpretation is SMBus slave device specific.
It can mean the offset to a list of functions inside
an SMBus slave device. Not all operations or slave devices support
this command's registers.
@param Operation Signifies which particular SMBus hardware protocol instance that it
will use to execute the SMBus transactions.
This SMBus hardware protocol is defined by the System Management Bus (SMBus)
Specification and is not related to UEFI.
@param PecCheck Defines if Packet Error Code (PEC) checking is required for this operation.
@param Length Signifies the number of bytes that this operation will do.
The maximum number of bytes can be revision specific and operation specific.
This parameter will contain the actual number of bytes that are executed
for this operation. Not all operations require this argument.
@param Buffer Contains the value of data to execute to the SMBus slave device.
Not all operations require this argument.
The length of this buffer is identified by Length.
@retval EFI_SUCCESS The last data that was returned from the access
matched the poll exit criteria.
@retval EFI_CRC_ERROR The checksum is not correct (PEC is incorrect)
@retval EFI_TIMEOUT Timeout expired before the operation was completed.
Timeout is determined by the SMBus host controller device.
@retval EFI_OUT_OF_RESOURCES The request could not be completed
due to a lack of resources.
@retval EFI_DEVICE_ERROR The request was not completed because
a failure reflected in the Host Status Register bit.
@retval EFI_INVALID_PARAMETER Operation is not defined in EFI_SMBUS_OPERATION.
Or Length/Buffer is NULL for operations except for EfiSmbusQuickRead and
EfiSmbusQuickWrite. Or Length is outside the range of valid values.
@retval EFI_UNSUPPORTED The SMBus operation or PEC is not supported.
@retval EFI_BUFFER_TOO_SMALL Buffer is not sufficient for this operation.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PEI_SMBUS2_PPI_EXECUTE_OPERATION)(
IN CONST EFI_PEI_SMBUS2_PPI *This,
IN CONST EFI_SMBUS_DEVICE_ADDRESS SlaveAddress,
IN CONST EFI_SMBUS_DEVICE_COMMAND Command,
IN CONST EFI_SMBUS_OPERATION Operation,
IN CONST BOOLEAN PecCheck,
IN OUT UINTN *Length,
IN OUT VOID *Buffer
);
/**
The ArpDevice() function enumerates the entire bus or enumerates a specific
device that is identified by SmbusUdid.
@param This A pointer to the EFI_PEI_SMBUS2_PPI instance.
@param ArpAll A Boolean expression that indicates if the host drivers need
to enumerate all the devices or enumerate only the device that is identified
by SmbusUdid. If ArpAll is TRUE, SmbusUdid and SlaveAddress are optional.
If ArpAll is FALSE, ArpDevice will enumerate SmbusUdid and the address
will be at SlaveAddress.
@param SmbusUdid The targeted SMBus Unique Device Identifier (UDID).
The UDID may not exist for SMBus devices with fixed addresses.
@param SlaveAddress The new SMBus address for the slave device for
which the operation is targeted.
@retval EFI_SUCCESS The SMBus slave device address was set.
@retval EFI_INVALID_PARAMETER SlaveAddress is NULL.
@retval EFI_OUT_OF_RESOURCES The request could not be completed
due to a lack of resources.
@retval EFI_TIMEOUT The SMBus slave device did not respond.
@retval EFI_DEVICE_ERROR The request was not completed because the transaction failed.
@retval EFI_UNSUPPORTED ArpDevice, GetArpMap, and Notify are not implemented by this PEIM.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PEI_SMBUS2_PPI_ARP_DEVICE)(
IN CONST EFI_PEI_SMBUS2_PPI *This,
IN CONST BOOLEAN ArpAll,
IN CONST EFI_SMBUS_UDID *SmbusUdid, OPTIONAL
IN OUT EFI_SMBUS_DEVICE_ADDRESS *SlaveAddress OPTIONAL
);
typedef struct {
EFI_SMBUS_DEVICE_ADDRESS SmbusDeviceAddress;
EFI_SMBUS_UDID SmbusDeviceUdid;
} EFI_SMBUS_DEVICE_MAP;
/**
The GetArpMap() function returns the mapping of all the SMBus devices
that are enumerated by the SMBus host driver.
@param This A pointer to the EFI_PEI_SMBUS2_PPI instance.
@param Length Size of the buffer that contains the SMBus device map.
@param SmbusDeviceMap The pointer to the device map as enumerated
by the SMBus controller driver.
@retval EFI_SUCCESS The device map was returned correctly in the buffer.
@retval EFI_UNSUPPORTED ArpDevice, GetArpMap, and Notify are not implemented by this PEIM.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PEI_SMBUS2_PPI_GET_ARP_MAP)(
IN CONST EFI_PEI_SMBUS2_PPI *This,
IN OUT UINTN *Length,
IN OUT EFI_SMBUS_DEVICE_MAP **SmbusDeviceMap
);
/**
CallBack function can be registered in EFI_PEI_SMBUS2_PPI_NOTIFY.
@param This A pointer to the EFI_PEI_SMBUS2_PPI instance.
@param SlaveAddress The SMBUS hardware address to which the SMBUS
device is preassigned or allocated.
@param Data Data of the SMBus host notify command that
the caller wants to be called.
@return Status
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PEI_SMBUS_NOTIFY2_FUNCTION)(
IN CONST EFI_PEI_SMBUS2_PPI *SmbusPpi,
IN CONST EFI_SMBUS_DEVICE_ADDRESS SlaveAddress,
IN CONST UINTN Data
);
/**
The Notify() function registers all the callback functions to allow the
bus driver to call these functions when the SlaveAddress/Data pair happens.
@param This A pointer to the EFI_PEI_SMBUS2_PPI instance.
@param SlaveAddress Address that the host controller detects as
sending a message and calls all the registered functions.
@param Data Data that the host controller detects as sending a message
and calls all the registered functions.
@param NotifyFunction The function to call when the bus driver
detects the SlaveAddress and Data pair.
@retval EFI_SUCCESS NotifyFunction has been registered.
@retval EFI_UNSUPPORTED ArpDevice, GetArpMap, and Notify are not
implemented by this PEIM.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PEI_SMBUS2_PPI_NOTIFY)(
IN CONST EFI_PEI_SMBUS2_PPI *This,
IN CONST EFI_SMBUS_DEVICE_ADDRESS SlaveAddress,
IN CONST UINTN Data,
IN CONST EFI_PEI_SMBUS_NOTIFY2_FUNCTION NotifyFunction
);
/**
@par Ppi Description:
Provides the basic I/O interfaces that a PEIM uses to access
its SMBus controller and the slave devices attached to it.
@param Execute
Executes the SMBus operation to an SMBus slave device.
@param ArpDevice
Allows an SMBus 2.0 device(s) to be Address Resolution Protocol (ARP)
@param GetArpMap
Allows a PEIM to retrieve the address that was allocated by the SMBus
host controller during enumeration/ARP.
@param Notify
Allows a driver to register for a callback to the SMBus host
controller driver when the bus issues a notification to the bus controller PEIM.
@param Identifier
Identifier which uniquely identifies this SMBus controller in a system.
**/
struct _EFI_PEI_SMBUS2_PPI {
EFI_PEI_SMBUS2_PPI_EXECUTE_OPERATION Execute;
EFI_PEI_SMBUS2_PPI_ARP_DEVICE ArpDevice;
EFI_PEI_SMBUS2_PPI_GET_ARP_MAP GetArpMap;
EFI_PEI_SMBUS2_PPI_NOTIFY Notify;
EFI_GUID Identifier;
};
extern EFI_GUID gEfiPeiSmbus2PpiGuid;
#endif
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