/** @file
This file declares the Smbus PPI, which provides the basic I/O interfaces that a PEIM
uses to access its SMBus controller and the slave devices attached to it.
Copyright (c) 2007 - 2010, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials are licensed and made available under
the terms and conditions of the BSD License that 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 Framework of EFI SmBus PPI spec.
Version 0.9.
**/
#ifndef _PEI_SMBUS_PPI_H_
#define _PEI_SMBUS_PPI_H_
#include <Ppi/Smbus2.h>
#define EFI_PEI_SMBUS_PPI_GUID \
{ \
0xabd42895, 0x78cf, 0x4872, {0x84, 0x44, 0x1b, 0x5c, 0x18, 0xb, 0xfb, 0xda } \
}
typedef struct _EFI_PEI_SMBUS_PPI EFI_PEI_SMBUS_PPI;
/**
Executes an SMBus operation to an SMBus controller.
@param[in] PeiServices A pointer to the system PEI Services Table.
@param[in] This A pointer to the EFI_PEI_SMBUS_PPI instance.
@param[in] SlaveAddress The SMBUS hardware address to which the SMBUS
device is preassigned or allocated.
@param[in] Command This command is transmitted by the SMBus host
controller to the SMBus slave device, and the
interpretation is SMBus slave device specific.
@param[in] Operation Signifies which particular SMBus hardware protocol
instance to use to execute the SMBus transactions.
@param[in] PecCheck Defines if Packet Error Code (PEC) checking is
required for this operation.
@param[in, out] Length The number of bytes for this operation.
@param[in, out] Buffer Contains the value of data to execute to the SMBus
slave device.
@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
was recorded in the Host Status Register bit.
@retval EFI_INVALID_PARAMETER The operation is not defined in EFI_SMBUS_OPERATION.
@retval EFI_INVALID_PARAMETER Length/Buffer is NULL for operations except for
EfiSmbusQuickRead and EfiSmbusQuickWrite. 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_SMBUS_PPI_EXECUTE_OPERATION)(
IN EFI_PEI_SERVICES **PeiServices,
IN EFI_PEI_SMBUS_PPI *This,
IN EFI_SMBUS_DEVICE_ADDRESS SlaveAddress,
IN EFI_SMBUS_DEVICE_COMMAND Command,
IN EFI_SMBUS_OPERATION Operation,
IN BOOLEAN PecCheck,
IN OUT UINTN *Length,
IN OUT VOID *Buffer
);
/**
This function is user-defined, and is called when the SlaveAddress/Data pair happens.
@param[in] PeiServices A pointer to the system PEI Services Table.
@param[in] This A pointer to the EFI_PEI_SMBUS_PPI instance.
@param[in] SlaveAddress The SMBUS hardware address to which the SMBUS
device is preassigned or allocated.
@param[in] Data Data of the SMBus host notify command, which denotes that
the caller wants to be called.
@return Status Code returned by callback function.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PEI_SMBUS_NOTIFY_FUNCTION)(
IN EFI_PEI_SERVICES **PeiServices,
IN EFI_PEI_SMBUS_PPI *SmbusPpi,
IN EFI_SMBUS_DEVICE_ADDRESS SlaveAddress,
IN UINTN Data
);
/**
The ArpDevice() function enumerates either the entire bus or a specific
device identified by SmbusUdid.
@param[in] PeiServices A pointer to the system PEI Services Table.
@param[in] This A pointer to the EFI_PEI_SMBUS_PPI instance.
@param[in] ArpAll A Boolean expression that indicates if the host
drivers need to enumerate all the devices or to
enumerate only the device that is identified
by SmbusUdid. If ArpAll is TRUE, SmbusUdid and
SlaveAddress are optional and ignored if entered.
If ArpAll is FALSE, ArpDevice will enumerate
SmbusUdid, and the address will be at SlaveAddress.
@param[in] SmbusUdid The targeted SMBus Unique Device Identifier (UDID).
The UDID may not exist for SMBus devices with fixed
addresses.
@param[in, out] SlaveAddress The new SMBus address for the slave device for
which the operation is targeted.
This address may be NULL.
@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() is not implemented by this PEIM.
This return value is not defined in the Framework Specification.
This return value was introduced in the PI Specification.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PEI_SMBUS_PPI_ARP_DEVICE)(
IN EFI_PEI_SERVICES **PeiServices,
IN EFI_PEI_SMBUS_PPI *This,
IN BOOLEAN ArpAll,
IN EFI_SMBUS_UDID *SmbusUdid, OPTIONAL
IN OUT EFI_SMBUS_DEVICE_ADDRESS *SlaveAddress OPTIONAL
);
/**
The GetArpMap() function returns the mapping of all the SMBus devices
that are enumerated by the SMBus host driver.
@param[in] PeiServices A pointer to the system PEI Services Table.
@param[in] This A pointer to the EFI_PEI_SMBUS_PPI instance.
@param[in, out] Length The size of the buffer that contains the SMBus device map.
@param[in, out] 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 GetArpMap() are not implemented by this PEIM.
This return value was not defined in the Framework Specification.
This return value was introduced in the PI Specification.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PEI_SMBUS_PPI_GET_ARP_MAP)(
IN EFI_PEI_SERVICES **PeiServices,
IN EFI_PEI_SMBUS_PPI *This,
IN OUT UINTN *Length,
IN OUT EFI_SMBUS_DEVICE_MAP **SmbusDeviceMap
);
/**
Allows a device driver to register for a callback when the bus driver detects a state that it needs to
propagate to other PEIMs that are registered for a callback.
The Notify() function registers all the callback functions to allow the
bus driver to call these functions when the SlaveAddress/Data pair occur.
All functions to be registered with EFI_PEI_SMBUS_PPI_NOTIFY must be of type
EFI_PEI_SMBUS_NOTIFY_FUNCTION.
@param[in] PeiServices A pointer to the system PEI Services Table.
@param[in] This A pointer to the EFI_PEI_SMBUS_PPI instance.
@param[in] SlaveAddress The address that the host controller detects as
sending a message and triggers all the registered functions.
@param[in] Data Data that the host controller detects as sending a message
and triggers all the registered functions.
@param[in] 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 Notify() are not implemented by this PEIM.
This return value is not defined in the Framework Specification.
This return value was introduced in the PI Specification.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PEI_SMBUS_PPI_NOTIFY)(
IN EFI_PEI_SERVICES **PeiServices,
IN EFI_PEI_SMBUS_PPI *This,
IN EFI_SMBUS_DEVICE_ADDRESS SlaveAddress,
IN UINTN Data,
IN EFI_PEI_SMBUS_NOTIFY_FUNCTION NotifyFunction
);
///
/// Provides the basic I/O interfaces that a PEIM uses to access
/// its SMBus controller and the slave devices attached to it.
///
struct _EFI_PEI_SMBUS_PPI {
///
/// Executes the SMBus operation to an SMBus slave device.
///
EFI_PEI_SMBUS_PPI_EXECUTE_OPERATION Execute;
///
/// Allows an SMBus 2.0 device(s) to be Address Resolution Protocol (ARP)
///
EFI_PEI_SMBUS_PPI_ARP_DEVICE ArpDevice;
///
/// Allows a PEIM to retrieve the address that was allocated by the SMBus
/// host controller during enumeration/ARP.
///
EFI_PEI_SMBUS_PPI_GET_ARP_MAP GetArpMap;
///
/// 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.
///
EFI_PEI_SMBUS_PPI_NOTIFY Notify;
};
extern EFI_GUID gEfiPeiSmbusPpiGuid;
#endif