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/** @file
PCH Smbus PEIM.
@copyright
Copyright (c) 1999 - 2012 Intel Corporation. All rights reserved
This software and associated documentation (if any) is furnished
under a license and may only be used or copied in accordance
with the terms of the license. Except as permitted by such
license, no part of this software or documentation may be
reproduced, stored in a retrieval system, or transmitted in any
form or by any means without the express written consent of
Intel Corporation.
This file contains an 'Intel Peripheral Driver' and uniquely
identified as "Intel Reference Module" and is
licensed for Intel CPUs and chipsets under the terms of your
license agreement with Intel or your vendor. This file may
be modified by the user, subject to additional terms of the
license agreement
**/
#include "PchSmbus.h"
///
/// Global variables
///
EFI_GUID mPeiSmbusPolicyPpiGuid = PEI_SMBUS_POLICY_PPI_GUID;
//
// Functions
//
/**
This function provides a standard way to execute an SMBUS command
PPI as defined in the SMBus Specification. The data can either be of
the length byte, word, or a block of data (1 to 32 bytes long).
The resulting transaction will be either the SMBus Slave Device accepts
this transaction or this function returns with an error
@param[in] PeiServices PEI services table pointer
@param[in] This PEI_SMBUS_PPI instance
@param[in] SlaveAddress Smbus Slave device address
@param[in] Command Command to be sent
@param[in] Operation Which SMBus PPI will be used
@param[in] PecCheck Defines if Packet Error Code Checking is to be used
@param[in, out] Length How many bytes to read/write. Must be 1 <= Length <= 32 depending on the Operation
@param[in, out] Buffer Data buffer
@retval EFI_SUCCESS Operation success.
Length will contain the actual number of bytes read.
Buffer will contain the data read.
@retval Otherwise Operation failed.
**/
EFI_STATUS
EFIAPI
SmbusExecute (
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
)
{
EFI_STATUS Status;
SMBUS_INSTANCE *Private;
DEBUG ((EFI_D_EVENT, "PEI SmbusExecute() Start, SmbusDeviceAddress=%x, Command=%x, Operation=%x\n", (SlaveAddress.SmbusDeviceAddress << 1), Command, Operation));
Private = SMBUS_PRIVATE_DATA_FROM_PPI_THIS (This);
Status = SmbusExec (
SlaveAddress,
Command,
Operation,
PecCheck,
Length,
Buffer
);
///
/// Last step, check notification
///
CheckNotification (Private);
DEBUG ((EFI_D_EVENT, "PEI SmbusExecute() End\n"));
return Status;
}
/**
Initialize the Smbus PPI and program the Smbus BAR
@param[in] FfsHeader Not used.
@param[in] PeiServices General purpose services available to every PEIM.
@retval EFI_SUCCESS The function completes successfully
@retval EFI_OUT_OF_RESOURCES Insufficient resources to create database
**/
EFI_STATUS
InitializePchSmbusPeim (
IN EFI_FFS_FILE_HEADER *FfsHeader,
IN EFI_PEI_SERVICES **PeiServices
)
{
EFI_STATUS Status;
SMBUS_INSTANCE *Private;
UINTN SmbusRegBase;
DEBUG ((EFI_D_INFO, "InitializePchSmbusPeim() Start\n"));
Private = (SMBUS_INSTANCE *) AllocatePool (sizeof (SMBUS_INSTANCE));
if (Private == NULL) {
DEBUG ((EFI_D_ERROR, "Failed to allocate memory for Private! \n"));
return EFI_OUT_OF_RESOURCES;
}
InitializePeiPrivate (PeiServices, Private);
SmbusRegBase = MmPciAddress (
0,
DEFAULT_PCI_BUS_NUMBER_PCH,
PCI_DEVICE_NUMBER_PCH_SMBUS,
PCI_FUNCTION_NUMBER_PCH_SMBUS,
0
);
///
/// Since PEI has no PCI enumerator, set the BAR & I/O space enable ourselves
///
MmioAndThenOr32 (SmbusRegBase + R_PCH_SMBUS_BASE, B_PCH_SMBUS_BASE_BAR, Private->SmbusIoBase);
MmioOr8 (SmbusRegBase + R_PCH_SMBUS_PCICMD, B_PCH_SMBUS_PCICMD_IOSE);
///
/// Reset the SMBus host controller
///
MmioOr8 (SmbusRegBase + R_PCH_SMBUS_HOSTC, B_PCH_SMBUS_HOSTC_SSRESET);
///
/// Enable the SMBus host controller
///
MmioAndThenOr8 (
SmbusRegBase + R_PCH_SMBUS_HOSTC,
(UINT8) (~(B_PCH_SMBUS_HOSTC_SMI_EN | B_PCH_SMBUS_HOSTC_I2C_EN)),
B_PCH_SMBUS_HOSTC_HST_EN
);
///
/// Clear Status Register before anyone uses the interfaces
///
SmbusIoWrite (R_PCH_SMBUS_HSTS, B_PCH_SMBUS_HSTS_ALL);
Status = PeiServicesInstallPpi (&Private->PpiDescriptor);
ASSERT_EFI_ERROR (Status);
///
/// Install a call-back for the permanent-memory so that we can fix up internal pointers
///
Status = (**PeiServices).NotifyPpi (PeiServices, &Private->NotifyDescriptor);
ASSERT_EFI_ERROR (Status);
DEBUG ((EFI_D_INFO, "InitializePchSmbusPeim() End\n"));
return EFI_SUCCESS;
}
/**
This function initializes the SmBus driver in PEI.
@param[in] PeiServices Standard PEI services
@param[in] Private SMBUS private data structure
@retval None.
**/
VOID
InitializePeiPrivate (
IN EFI_PEI_SERVICES **PeiServices,
IN SMBUS_INSTANCE *Private
)
{
EFI_STATUS Status;
Private->Signature = PCH_SMBUS_PRIVATE_DATA_SIGNATURE;
Private->PeiServices = PeiServices;
Status = (**PeiServices).LocatePpi (
PeiServices,
&mPeiSmbusPolicyPpiGuid,
0,
NULL,
(VOID **) &(Private->SmbusPolicy)
);
ASSERT_EFI_ERROR (Status);
Private->SmbusIoBase = Private->SmbusPolicy->BaseAddress;
Private->PpiDescriptor.Flags = EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST;
Private->PpiDescriptor.Guid = &gEfiPeiSmbusPpiGuid;
Private->PpiDescriptor.Ppi = &Private->SmbusPpi;
Private->SmbusPpi.Execute = SmbusExecute;
Private->SmbusPpi.ArpDevice = SmbusArpDevice;
Private->SmbusPpi.GetArpMap = SmbusGetArpMap;
Private->SmbusPpi.Notify = SmbusNotify;
Private->NotifyDescriptor.Flags = (EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST);
Private->NotifyDescriptor.Guid = &gEfiPeiMemoryDiscoveredPpiGuid;
Private->NotifyDescriptor.Notify = MemoryDiscoveredPpiNotifyCallback;
Private->DeviceMapEntries = 0;
Private->PlatformNumRsvd = Private->SmbusPolicy->NumRsvdAddress;
Private->PlatformRsvdAddr = Private->SmbusPolicy->RsvdAddress;
Private->NotifyFunctionNum = 0;
return;
}
/**
Fix up pointers since they are located in real memory now.
@param[in] PeiServices General purpose services available to every PEIM.
@param[in] NotifyDescriptor The notification structure this PEIM registered on install.
@param[in] Ppi The memory discovered PPI. Not used.
@retval EFI_SUCCESS The function completed successfully.
**/
EFI_STATUS
EFIAPI
MemoryDiscoveredPpiNotifyCallback (
IN EFI_PEI_SERVICES **PeiServices,
IN EFI_PEI_NOTIFY_DESCRIPTOR *NotifyDescriptor,
IN VOID *Ppi
)
{
SMBUS_INSTANCE *Private;
Private = SMBUS_PRIVATE_DATA_FROM_NOTIFY_THIS (NotifyDescriptor);
InitializePeiPrivate (PeiServices, Private);
return EFI_SUCCESS;
}
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