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290 lines
11 KiB
C
290 lines
11 KiB
C
/** @file
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The file provides basic SMBus host controller management
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and basic data transactions over the SMBus.
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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@par Revision Reference: PI
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Version 1.00.
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**/
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#ifndef __SMBUS_HC_H__
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#define __SMBUS_HC_H__
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#include <IndustryStandard/SmBus.h>
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#define EFI_SMBUS_HC_PROTOCOL_GUID \
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{0xe49d33ed, 0x513d, 0x4634, { 0xb6, 0x98, 0x6f, 0x55, 0xaa, 0x75, 0x1c, 0x1b} }
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typedef struct _EFI_SMBUS_HC_PROTOCOL EFI_SMBUS_HC_PROTOCOL;
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/**
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The Execute() function provides a standard way to execute an
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operation as defined in the System Management Bus (SMBus)
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Specification. The resulting transaction will be either that
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the SMBus slave devices accept this transaction or that this
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function returns with error.
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@param This A pointer to the EFI_SMBUS_HC_PROTOCOL instance.
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SlaveAddress The SMBus slave address of the device
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with which to communicate. Type
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EFI_SMBUS_DEVICE_ADDRESS is defined in
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EFI_PEI_SMBUS_PPI.Execute() in the Platform
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Initialization SMBus PPI Specification.
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@param Command This command is transmitted by the SMBus host
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controller to the SMBus slave device and the
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interpretation is SMBus slave device specific.
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It can mean the offset to a list of functions
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inside an SMBus slave device. Not all
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operations or slave devices support this
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command's registers. Type
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EFI_SMBUS_DEVICE_COMMAND is defined in
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EFI_PEI_SMBUS_PPI.Execute() in the Platform
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Initialization SMBus PPI Specification.
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@param Operation Signifies the particular SMBus
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hardware protocol instance it will use to
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execute the SMBus transactions. This SMBus
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hardware protocol is defined by the SMBus
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Specification and is not related to PI
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Architecture. Type EFI_SMBUS_OPERATION is
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defined in EFI_PEI_SMBUS_PPI.Execute() in the
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Platform Initialization SMBus PPI
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Specification.
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@param PecCheck Defines if Packet Error Code (PEC) checking
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is required for this operation. SMBus Host
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Controller Code Definitions Version 1.0
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August 21, 2006 13
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@param Length Signifies the number of bytes that this operation will do.
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The maximum number of bytes can be revision
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specific and operation specific. This field
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will contain the actual number of bytes that
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are executed for this operation. Not all
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operations require this argument.
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@param Buffer Contains the value of data to execute to the
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SMBus slave device. Not all operations require
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this argument. The length of this buffer is
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identified by Length.
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@retval EFI_SUCCESS The last data that was returned from the
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access matched the poll exit criteria.
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@retval EFI_CRC_ERROR Checksum is not correct (PEC is incorrect).
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@retval EFI_TIMEOUT Timeout expired before the operation was
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completed. Timeout is determined by the
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SMBus host controller device.
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@retval EFI_OUT_OF_RESOURCES The request could not be
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completed due to a lack of
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resources.
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@retval EFI_DEVICE_ERROR The request was not completed
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because a failure that was reflected
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in the Host Status Register bit.
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Device errors are a result of a
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transaction collision, illegal
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command field, unclaimed cycle (host
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initiated), or bus errors
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(collisions).
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@retval EFI_INVALID_PARAMETER Operation is not defined in
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EFI_SMBUS_OPERATION.
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@retval EFI_INVALID_PARAMETER Length/Buffer is NULL for
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operations except for
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EfiSmbusQuickRead and
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EfiSmbusQuickWrite. Length is
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outside the range of valid
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values.
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@retval EFI_UNSUPPORTED The SMBus operation or PEC is not
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supported.
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@retval EFI_BUFFER_TOO_SMALL Buffer is not sufficient for
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this operation.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMBUS_HC_EXECUTE_OPERATION)(
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IN CONST EFI_SMBUS_HC_PROTOCOL *This,
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IN EFI_SMBUS_DEVICE_ADDRESS SlaveAddress,
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IN EFI_SMBUS_DEVICE_COMMAND Command,
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IN EFI_SMBUS_OPERATION Operation,
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IN BOOLEAN PecCheck,
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IN OUT UINTN *Length,
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IN OUT VOID *Buffer
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);
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/**
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The ArpDevice() function provides a standard way for a device driver to
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enumerate the entire SMBus or specific devices on the bus.
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@param This A pointer to the EFI_SMBUS_HC_PROTOCOL instance.
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@param ArpAll A Boolean expression that indicates if the
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host drivers need to enumerate all the devices
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or enumerate only the device that is
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identified by SmbusUdid. If ArpAll is TRUE,
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SmbusUdid and SlaveAddress are optional. If
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ArpAll is FALSE, ArpDevice will enumerate
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SmbusUdid and the address will be at
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SlaveAddress.
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@param SmbusUdid The Unique Device Identifier (UDID) that is
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associated with this device. Type
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EFI_SMBUS_UDID is defined in
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EFI_PEI_SMBUS_PPI.ArpDevice() in the
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Platform Initialization SMBus PPI
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Specification.
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@param SlaveAddress The SMBus slave address that is
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associated with an SMBus UDID.
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@retval EFI_SUCCESS The last data that was returned from the
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access matched the poll exit criteria.
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@retval EFI_CRC_ERROR Checksum is not correct (PEC is
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incorrect).
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@retval EFI_TIMEOUT Timeout expired before the operation was
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completed. Timeout is determined by the
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SMBus host controller device.
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@retval EFI_OUT_OF_RESOURCES The request could not be
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completed due to a lack of
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resources.
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@retval EFI_DEVICE_ERROR The request was not completed
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because a failure was reflected in
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the Host Status Register bit. Device
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Errors are a result of a transaction
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collision, illegal command field,
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unclaimed cycle (host initiated), or
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bus errors (collisions).
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@retval EFI_UNSUPPORTED ArpDevice, GetArpMap, and Notify are
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not implemented by this driver.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMBUS_HC_PROTOCOL_ARP_DEVICE)(
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IN CONST EFI_SMBUS_HC_PROTOCOL *This,
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IN BOOLEAN ArpAll,
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IN EFI_SMBUS_UDID *SmbusUdid, OPTIONAL
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IN OUT EFI_SMBUS_DEVICE_ADDRESS *SlaveAddress OPTIONAL
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);
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/**
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The GetArpMap() function returns the mapping of all the SMBus devices
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that were enumerated by the SMBus host driver.
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@param This A pointer to the EFI_SMBUS_HC_PROTOCOL instance.
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@param Length Size of the buffer that contains the SMBus
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device map.
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@param SmbusDeviceMap The pointer to the device map as
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enumerated by the SMBus controller
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driver.
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@retval EFI_SUCCESS The SMBus returned the current device map.
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@retval EFI_UNSUPPORTED ArpDevice, GetArpMap, and Notify are
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not implemented by this driver.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMBUS_HC_PROTOCOL_GET_ARP_MAP)(
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IN CONST EFI_SMBUS_HC_PROTOCOL *This,
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IN OUT UINTN *Length,
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IN OUT EFI_SMBUS_DEVICE_MAP **SmbusDeviceMap
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);
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/**
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The notify function does some actions.
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@param SlaveAddress
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The SMBUS hardware address to which the SMBUS device is preassigned or allocated.
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@param Data
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Data of the SMBus host notify command that the caller wants to be called.
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@return EFI_STATUS
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMBUS_NOTIFY_FUNCTION)(
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IN EFI_SMBUS_DEVICE_ADDRESS SlaveAddress,
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IN UINTN Data
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);
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/**
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The Notify() function registers all the callback functions to
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allow the bus driver to call these functions when the
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SlaveAddress/Data pair happens.
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@param This A pointer to the EFI_SMBUS_HC_PROTOCOL instance.
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@param SlaveAddress Address that the host controller detects
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as sending a message and calls all the registered function.
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@param Data Data that the host controller detects as sending
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message and calls all the registered function.
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@param NotifyFunction The function to call when the bus
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driver detects the SlaveAddress and
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Data pair.
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@retval EFI_SUCCESS NotifyFunction was registered.
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@retval EFI_UNSUPPORTED ArpDevice, GetArpMap, and Notify are
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not implemented by this driver.
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**/
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typedef
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EFI_STATUS
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(EFIAPI *EFI_SMBUS_HC_PROTOCOL_NOTIFY)(
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IN CONST EFI_SMBUS_HC_PROTOCOL *This,
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IN EFI_SMBUS_DEVICE_ADDRESS SlaveAddress,
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IN UINTN Data,
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IN EFI_SMBUS_NOTIFY_FUNCTION NotifyFunction
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);
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///
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/// The EFI_SMBUS_HC_PROTOCOL provides SMBus host controller management and basic data
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/// transactions over SMBus. There is one EFI_SMBUS_HC_PROTOCOL instance for each SMBus
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/// host controller.
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///
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struct _EFI_SMBUS_HC_PROTOCOL {
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EFI_SMBUS_HC_EXECUTE_OPERATION Execute;
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EFI_SMBUS_HC_PROTOCOL_ARP_DEVICE ArpDevice;
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EFI_SMBUS_HC_PROTOCOL_GET_ARP_MAP GetArpMap;
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EFI_SMBUS_HC_PROTOCOL_NOTIFY Notify;
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};
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extern EFI_GUID gEfiSmbusHcProtocolGuid;
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#endif
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