diff options
Diffstat (limited to 'Vlv2TbltDevicePkg/Library/SmbusLib/SmbusLib.c')
| -rw-r--r-- | Vlv2TbltDevicePkg/Library/SmbusLib/SmbusLib.c | 878 |
1 files changed, 878 insertions, 0 deletions
diff --git a/Vlv2TbltDevicePkg/Library/SmbusLib/SmbusLib.c b/Vlv2TbltDevicePkg/Library/SmbusLib/SmbusLib.c new file mode 100644 index 0000000000..8ca472da9b --- /dev/null +++ b/Vlv2TbltDevicePkg/Library/SmbusLib/SmbusLib.c @@ -0,0 +1,878 @@ +/** @file
+ Intel ICH9 SMBUS library implementation built upon I/O library.
+
+ Copyright (c) 2010 - 2014, 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.
+
+
+**/
+
+#include "CommonHeader.h"
+
+/**
+ Gets Io port base address of Smbus Host Controller.
+
+ This internal function depends on a feature flag named PcdIchSmbusFixedIoPortBaseAddress
+ to retrieve Smbus Io port base. If that feature flag is true, it will get Smbus Io port base
+ address from a preset Pcd entry named PcdIchSmbusIoPortBaseAddress; otherwise, it will always
+ read Pci configuration space to get that value in each Smbus bus transaction.
+
+ @return The Io port base address of Smbus host controller.
+
+**/
+UINTN
+InternalGetSmbusIoPortBaseAddress (
+ VOID
+ )
+{
+ UINTN IoPortBaseAddress;
+
+ IoPortBaseAddress = (UINTN) MmioRead32 (MmPciAddress (0, DEFAULT_PCI_BUS_NUMBER_PCH, PCI_DEVICE_NUMBER_PCH_SMBUS, PCI_FUNCTION_NUMBER_PCH_SMBUS, R_PCH_SMBUS_BASE)) & B_PCH_SMBUS_BASE_BAR;
+
+ //
+ // Make sure that the IO port base address has been properly set.
+ //
+ ASSERT (IoPortBaseAddress != 0);
+
+ return IoPortBaseAddress;
+}
+
+/**
+ Acquires the ownership of SMBUS.
+
+ This internal function reads the host state register.
+ If the SMBUS is not available, RETURN_TIMEOUT is returned;
+ Otherwise, it performs some basic initializations and returns
+ RETURN_SUCCESS.
+
+ @param IoPortBaseAddress The Io port base address of Smbus Host controller.
+
+ @retval RETURN_SUCCESS The SMBUS command was executed successfully.
+ @retval RETURN_TIMEOUT A timeout occurred while executing the SMBUS command.
+
+**/
+RETURN_STATUS
+InternalSmBusAcquire (
+ UINTN IoPortBaseAddress
+ )
+{
+ UINT8 HostStatus;
+
+ HostStatus = IoRead8 (IoPortBaseAddress + R_PCH_SMBUS_HSTS);
+ if ((HostStatus & B_PCH_SMBUS_IUS) != 0) {
+ return RETURN_TIMEOUT;
+ } else if ((HostStatus & B_PCH_SMBUS_HBSY) != 0) {
+ //
+ // Clear host status register and exit.
+ //
+ IoWrite8 (IoPortBaseAddress + R_PCH_SMBUS_HSTS, B_PCH_SMBUS_HSTS_ALL);
+ return RETURN_TIMEOUT;
+ }
+ //
+ // Clear out any odd status information (Will Not Clear In Use).
+ //
+ IoWrite8 (IoPortBaseAddress + R_PCH_SMBUS_HSTS, HostStatus);
+
+ return RETURN_SUCCESS;
+}
+
+/**
+ Starts the SMBUS transaction and waits until the end.
+
+ This internal function start the SMBUS transaction and waits until the transaction
+ of SMBUS is over by polling the INTR bit of Host status register.
+ If the SMBUS is not available, RETURN_TIMEOUT is returned;
+ Otherwise, it performs some basic initializations and returns
+ RETURN_SUCCESS.
+
+ @param IoPortBaseAddress The Io port base address of Smbus Host controller.
+ @param HostControl The Host control command to start SMBUS transaction.
+
+ @retval RETURN_SUCCESS The SMBUS command was executed successfully.
+ @retval RETURN_CRC_ERROR The checksum is not correct (PEC is incorrect).
+ @retval RETURN_DEVICE_ERROR The request was not completed because a failure reflected
+ in the Host Status Register bit. Device errors are
+ a result of a transaction collision, illegal command field,
+ unclaimed cycle (host initiated), or bus errors (collisions).
+
+**/
+RETURN_STATUS
+InternalSmBusStart (
+ IN UINTN IoPortBaseAddress,
+ IN UINT8 HostControl
+ )
+{
+ UINT8 HostStatus;
+ UINT8 AuxiliaryStatus;
+
+ //
+ // Set Host Control Register (Initiate Operation, Interrupt disabled).
+ //
+ IoWrite8 (IoPortBaseAddress + R_PCH_SMBUS_HCTL, (UINT8)(HostControl + B_PCH_SMBUS_START));
+
+ do {
+ //
+ // Poll INTR bit of Host Status Register.
+ //
+ HostStatus = IoRead8 (IoPortBaseAddress + R_PCH_SMBUS_HSTS);
+ } while ((HostStatus & (B_PCH_SMBUS_INTR | B_PCH_SMBUS_ERRORS | B_PCH_SMBUS_BYTE_DONE_STS)) == 0);
+
+ if ((HostStatus & B_PCH_SMBUS_ERRORS) == 0) {
+ return RETURN_SUCCESS;
+ }
+
+ //
+ // Clear error bits of Host Status Register.
+ //
+ IoWrite8 (IoPortBaseAddress + R_PCH_SMBUS_HSTS, B_PCH_SMBUS_ERRORS);
+
+ //
+ // Read Auxiliary Status Register to judge CRC error.
+ //
+ AuxiliaryStatus = IoRead8 (IoPortBaseAddress + R_PCH_SMBUS_AUXS);
+ if ((AuxiliaryStatus & B_PCH_SMBUS_CRCE) != 0) {
+ return RETURN_CRC_ERROR;
+ }
+
+ return RETURN_DEVICE_ERROR;
+}
+
+/**
+ Executes an SMBUS quick, byte or word command.
+
+ This internal function executes an SMBUS quick, byte or word commond.
+ If Status is not NULL, then the status of the executed command is returned in Status.
+
+ @param HostControl The value of Host Control Register to set.
+ @param SmBusAddress Address that encodes the SMBUS Slave Address,
+ SMBUS Command, SMBUS Data Length, and PEC.
+ @param Value The byte/word write to the SMBUS.
+ @param Status Return status for the executed command.
+ This is an optional parameter and may be NULL.
+
+ @return The byte/word read from the SMBUS.
+
+**/
+UINT16
+InternalSmBusNonBlock (
+ IN UINT8 HostControl,
+ IN UINTN SmBusAddress,
+ IN UINT16 Value,
+ OUT RETURN_STATUS *Status
+ )
+{
+ RETURN_STATUS ReturnStatus;
+ UINTN IoPortBaseAddress;
+ UINT8 AuxiliaryControl;
+
+ IoPortBaseAddress = InternalGetSmbusIoPortBaseAddress ();
+
+ //
+ // Try to acquire the ownership of ICH SMBUS.
+ //
+ ReturnStatus = InternalSmBusAcquire (IoPortBaseAddress);
+ if (RETURN_ERROR (ReturnStatus)) {
+ goto Done;
+ }
+
+ //
+ // Set the appropriate Host Control Register and auxiliary Control Register.
+ //
+ AuxiliaryControl = 0;
+ if (SMBUS_LIB_PEC (SmBusAddress)) {
+ AuxiliaryControl |= B_PCH_SMBUS_AAC;
+ HostControl |= B_PCH_SMBUS_PEC_EN;
+ }
+
+ //
+ // Set Host Command Register.
+ //
+ IoWrite8 (IoPortBaseAddress + R_PCH_SMBUS_HCMD, (UINT8) SMBUS_LIB_COMMAND (SmBusAddress));
+
+ //
+ // Write value to Host Data 0 and Host Data 1 Registers.
+ //
+ IoWrite8 (IoPortBaseAddress + R_PCH_SMBUS_HD0, (UINT8) Value);
+ IoWrite8 (IoPortBaseAddress + R_PCH_SMBUS_HD1, (UINT8) (Value >> 8));
+
+ //
+ // Set Auxiliary Control Register.
+ //
+ IoWrite8 (IoPortBaseAddress + R_PCH_SMBUS_AUXC, AuxiliaryControl);
+
+ //
+ // Set SMBUS slave address for the device to send/receive from.
+ //
+ IoWrite8 (IoPortBaseAddress + R_PCH_SMBUS_TSA, (UINT8) SmBusAddress);
+
+ //
+ // Start the SMBUS transaction and wait for the end.
+ //
+ ReturnStatus = InternalSmBusStart (IoPortBaseAddress, HostControl);
+
+ //
+ // Read value from Host Data 0 and Host Data 1 Registers.
+ //
+ Value = (UINT16)(IoRead8 (IoPortBaseAddress + R_PCH_SMBUS_HD1) << 8);
+ Value = (UINT16)(Value | IoRead8 (IoPortBaseAddress + R_PCH_SMBUS_HD0));
+
+ //
+ // Clear Host Status Register and Auxiliary Status Register.
+ //
+ IoWrite8 (IoPortBaseAddress + R_PCH_SMBUS_HSTS, B_PCH_SMBUS_HSTS_ALL);
+ IoWrite8 (IoPortBaseAddress + R_PCH_SMBUS_AUXS, B_PCH_SMBUS_CRCE);
+
+Done:
+ if (Status != NULL) {
+ *Status = ReturnStatus;
+ }
+
+ return Value;
+}
+
+/**
+ Executes an SMBUS quick read command.
+
+ Executes an SMBUS quick read command on the SMBUS device specified by SmBusAddress.
+ Only the SMBUS slave address field of SmBusAddress is required.
+ If Status is not NULL, then the status of the executed command is returned in Status.
+ If PEC is set in SmBusAddress, then ASSERT().
+ If Command in SmBusAddress is not zero, then ASSERT().
+ If Length in SmBusAddress is not zero, then ASSERT().
+ If any reserved bits of SmBusAddress are set, then ASSERT().
+
+ @param SmBusAddress Address that encodes the SMBUS Slave Address,
+ SMBUS Command, SMBUS Data Length, and PEC.
+ @param Status Return status for the executed command.
+ This is an optional parameter and may be NULL.
+
+**/
+VOID
+EFIAPI
+SmBusQuickRead (
+ IN UINTN SmBusAddress,
+ OUT RETURN_STATUS *Status OPTIONAL
+ )
+{
+ ASSERT (!SMBUS_LIB_PEC (SmBusAddress));
+ ASSERT (SMBUS_LIB_COMMAND (SmBusAddress) == 0);
+ ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0);
+ ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0);
+
+ InternalSmBusNonBlock (
+ V_PCH_SMBUS_SMB_CMD_QUICK,
+ SmBusAddress | B_PCH_SMBUS_RW_SEL_READ,
+ 0,
+ Status
+ );
+}
+
+/**
+ Executes an SMBUS quick write command.
+
+ Executes an SMBUS quick write command on the SMBUS device specified by SmBusAddress.
+ Only the SMBUS slave address field of SmBusAddress is required.
+ If Status is not NULL, then the status of the executed command is returned in Status.
+ If PEC is set in SmBusAddress, then ASSERT().
+ If Command in SmBusAddress is not zero, then ASSERT().
+ If Length in SmBusAddress is not zero, then ASSERT().
+ If any reserved bits of SmBusAddress are set, then ASSERT().
+
+ @param SmBusAddress Address that encodes the SMBUS Slave Address,
+ SMBUS Command, SMBUS Data Length, and PEC.
+ @param Status Return status for the executed command.
+ This is an optional parameter and may be NULL.
+
+**/
+VOID
+EFIAPI
+SmBusQuickWrite (
+ IN UINTN SmBusAddress,
+ OUT RETURN_STATUS *Status OPTIONAL
+ )
+{
+ ASSERT (!SMBUS_LIB_PEC (SmBusAddress));
+ ASSERT (SMBUS_LIB_COMMAND (SmBusAddress) == 0);
+ ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0);
+ ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0);
+
+ InternalSmBusNonBlock (
+ V_PCH_SMBUS_SMB_CMD_QUICK,
+ SmBusAddress | B_PCH_SMBUS_RW_SEL_WRITE,
+ 0,
+ Status
+ );
+}
+
+/**
+ Executes an SMBUS receive byte command.
+
+ Executes an SMBUS receive byte command on the SMBUS device specified by SmBusAddress.
+ Only the SMBUS slave address field of SmBusAddress is required.
+ The byte received from the SMBUS is returned.
+ If Status is not NULL, then the status of the executed command is returned in Status.
+ If Command in SmBusAddress is not zero, then ASSERT().
+ If Length in SmBusAddress is not zero, then ASSERT().
+ If any reserved bits of SmBusAddress are set, then ASSERT().
+
+ @param SmBusAddress Address that encodes the SMBUS Slave Address,
+ SMBUS Command, SMBUS Data Length, and PEC.
+ @param Status Return status for the executed command.
+ This is an optional parameter and may be NULL.
+
+ @return The byte received from the SMBUS.
+
+**/
+UINT8
+EFIAPI
+SmBusReceiveByte (
+ IN UINTN SmBusAddress,
+ OUT RETURN_STATUS *Status OPTIONAL
+ )
+{
+ UINT8 ValueReturn = 0;
+
+ ASSERT (SMBUS_LIB_COMMAND (SmBusAddress) == 0);
+ ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0);
+ ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0);
+
+ ValueReturn = (UINT8) InternalSmBusNonBlock (
+ V_PCH_SMBUS_SMB_CMD_BYTE,
+ SmBusAddress | B_PCH_SMBUS_RW_SEL_READ,
+ 0,
+ Status
+ );
+ return ValueReturn;
+
+ }
+
+/**
+ Executes an SMBUS send byte command.
+
+ Executes an SMBUS send byte command on the SMBUS device specified by SmBusAddress.
+ The byte specified by Value is sent.
+ Only the SMBUS slave address field of SmBusAddress is required. Value is returned.
+ If Status is not NULL, then the status of the executed command is returned in Status.
+ If Command in SmBusAddress is not zero, then ASSERT().
+ If Length in SmBusAddress is not zero, then ASSERT().
+ If any reserved bits of SmBusAddress are set, then ASSERT().
+
+ @param SmBusAddress Address that encodes the SMBUS Slave Address,
+ SMBUS Command, SMBUS Data Length, and PEC.
+ @param Value The 8-bit value to send.
+ @param Status Return status for the executed command.
+ This is an optional parameter and may be NULL.
+
+ @return The parameter of Value.
+
+**/
+UINT8
+EFIAPI
+SmBusSendByte (
+ IN UINTN SmBusAddress,
+ IN UINT8 Value,
+ OUT RETURN_STATUS *Status OPTIONAL
+ )
+{
+ UINT8 ValueReturn = 0;
+
+ ASSERT (SMBUS_LIB_COMMAND (SmBusAddress) == 0);
+ ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0);
+ ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0);
+
+ ValueReturn = (UINT8) InternalSmBusNonBlock (
+ V_PCH_SMBUS_SMB_CMD_BYTE,
+ SmBusAddress | B_PCH_SMBUS_RW_SEL_WRITE,
+ Value,
+ Status
+ );
+ return ValueReturn;
+
+ }
+
+/**
+ Executes an SMBUS read data byte command.
+
+ Executes an SMBUS read data byte command on the SMBUS device specified by SmBusAddress.
+ Only the SMBUS slave address and SMBUS command fields of SmBusAddress are required.
+ The 8-bit value read from the SMBUS is returned.
+ If Status is not NULL, then the status of the executed command is returned in Status.
+ If Length in SmBusAddress is not zero, then ASSERT().
+ If any reserved bits of SmBusAddress are set, then ASSERT().
+
+ @param SmBusAddress Address that encodes the SMBUS Slave Address,
+ SMBUS Command, SMBUS Data Length, and PEC.
+ @param Status Return status for the executed command.
+ This is an optional parameter and may be NULL.
+
+ @return The byte read from the SMBUS.
+
+**/
+UINT8
+EFIAPI
+SmBusReadDataByte (
+ IN UINTN SmBusAddress,
+ OUT RETURN_STATUS *Status OPTIONAL
+ )
+{
+ UINT8 ValueReturn = 0;
+
+ ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0);
+ ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0);
+ ValueReturn = (UINT8) InternalSmBusNonBlock (
+ V_PCH_SMBUS_SMB_CMD_BYTE_DATA,
+ SmBusAddress | B_PCH_SMBUS_RW_SEL_READ,
+ 0,
+ Status
+ );
+ return ValueReturn;
+}
+
+/**
+ Executes an SMBUS write data byte command.
+
+ Executes an SMBUS write data byte command on the SMBUS device specified by SmBusAddress.
+ The 8-bit value specified by Value is written.
+ Only the SMBUS slave address and SMBUS command fields of SmBusAddress are required.
+ Value is returned.
+ If Status is not NULL, then the status of the executed command is returned in Status.
+ If Length in SmBusAddress is not zero, then ASSERT().
+ If any reserved bits of SmBusAddress are set, then ASSERT().
+
+ @param SmBusAddress Address that encodes the SMBUS Slave Address,
+ SMBUS Command, SMBUS Data Length, and PEC.
+ @param Value The 8-bit value to write.
+ @param Status Return status for the executed command.
+ This is an optional parameter and may be NULL.
+
+ @return The parameter of Value.
+
+**/
+UINT8
+EFIAPI
+SmBusWriteDataByte (
+ IN UINTN SmBusAddress,
+ IN UINT8 Value,
+ OUT RETURN_STATUS *Status OPTIONAL
+ )
+{
+ UINT8 ValueReturn = 0;
+
+ ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0);
+ ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0);
+
+ ValueReturn = (UINT8) InternalSmBusNonBlock (
+ V_PCH_SMBUS_SMB_CMD_BYTE_DATA,
+ SmBusAddress | B_PCH_SMBUS_RW_SEL_WRITE,
+ Value,
+ Status
+ );
+ return ValueReturn;
+
+}
+
+/**
+ Executes an SMBUS read data word command.
+
+ Executes an SMBUS read data word command on the SMBUS device specified by SmBusAddress.
+ Only the SMBUS slave address and SMBUS command fields of SmBusAddress are required.
+ The 16-bit value read from the SMBUS is returned.
+ If Status is not NULL, then the status of the executed command is returned in Status.
+ If Length in SmBusAddress is not zero, then ASSERT().
+ If any reserved bits of SmBusAddress are set, then ASSERT().
+
+ @param SmBusAddress Address that encodes the SMBUS Slave Address,
+ SMBUS Command, SMBUS Data Length, and PEC.
+ @param Status Return status for the executed command.
+ This is an optional parameter and may be NULL.
+
+ @return The byte read from the SMBUS.
+
+**/
+UINT16
+EFIAPI
+SmBusReadDataWord (
+ IN UINTN SmBusAddress,
+ OUT RETURN_STATUS *Status OPTIONAL
+ )
+{
+ UINT16 ValueReturn = 0;
+ ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0);
+ ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0);
+
+ ValueReturn = InternalSmBusNonBlock (
+ V_PCH_SMBUS_SMB_CMD_WORD_DATA,
+ SmBusAddress | B_PCH_SMBUS_RW_SEL_READ,
+ 0,
+ Status
+ );
+ return ValueReturn;
+
+}
+
+/**
+ Executes an SMBUS write data word command.
+
+ Executes an SMBUS write data word command on the SMBUS device specified by SmBusAddress.
+ The 16-bit value specified by Value is written.
+ Only the SMBUS slave address and SMBUS command fields of SmBusAddress are required.
+ Value is returned.
+ If Status is not NULL, then the status of the executed command is returned in Status.
+ If Length in SmBusAddress is not zero, then ASSERT().
+ If any reserved bits of SmBusAddress are set, then ASSERT().
+
+ @param SmBusAddress Address that encodes the SMBUS Slave Address,
+ SMBUS Command, SMBUS Data Length, and PEC.
+ @param Value The 16-bit value to write.
+ @param Status Return status for the executed command.
+ This is an optional parameter and may be NULL.
+
+ @return The parameter of Value.
+
+**/
+UINT16
+EFIAPI
+SmBusWriteDataWord (
+ IN UINTN SmBusAddress,
+ IN UINT16 Value,
+ OUT RETURN_STATUS *Status OPTIONAL
+ )
+{
+ UINT16 ValueReturn = 0;
+ ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0);
+ ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0);
+
+ ValueReturn = InternalSmBusNonBlock (
+ V_PCH_SMBUS_SMB_CMD_WORD_DATA,
+ SmBusAddress | B_PCH_SMBUS_RW_SEL_WRITE,
+ Value,
+ Status
+ );
+ return ValueReturn;
+}
+
+/**
+ Executes an SMBUS process call command.
+
+ Executes an SMBUS process call command on the SMBUS device specified by SmBusAddress.
+ The 16-bit value specified by Value is written.
+ Only the SMBUS slave address and SMBUS command fields of SmBusAddress are required.
+ The 16-bit value returned by the process call command is returned.
+ If Status is not NULL, then the status of the executed command is returned in Status.
+ If Length in SmBusAddress is not zero, then ASSERT().
+ If any reserved bits of SmBusAddress are set, then ASSERT().
+
+ @param SmBusAddress Address that encodes the SMBUS Slave Address,
+ SMBUS Command, SMBUS Data Length, and PEC.
+ @param Value The 16-bit value to write.
+ @param Status Return status for the executed command.
+ This is an optional parameter and may be NULL.
+
+ @return The 16-bit value returned by the process call command.
+
+**/
+UINT16
+EFIAPI
+SmBusProcessCall (
+ IN UINTN SmBusAddress,
+ IN UINT16 Value,
+ OUT RETURN_STATUS *Status OPTIONAL
+ )
+{
+ UINT16 ValueReturn = 0;
+ ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0);
+ ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0);
+
+ ValueReturn = InternalSmBusNonBlock (
+ V_PCH_SMBUS_SMB_CMD_PROCESS_CALL,
+ SmBusAddress | B_PCH_SMBUS_RW_SEL_WRITE,
+ Value,
+ Status
+ );
+ return ValueReturn;
+}
+
+/**
+ Executes an SMBUS block command.
+
+ Executes an SMBUS block read, block write and block write-block read command
+ on the SMBUS device specified by SmBusAddress.
+ Bytes are read from the SMBUS and stored in Buffer.
+ The number of bytes read is returned, and will never return a value larger than 32-bytes.
+ If Status is not NULL, then the status of the executed command is returned in Status.
+ It is the caller's responsibility to make sure Buffer is large enough for the total number of bytes read.
+ SMBUS supports a maximum transfer size of 32 bytes, so Buffer does not need to be any larger than 32 bytes.
+
+ @param HostControl The value of Host Control Register to set.
+ @param SmBusAddress Address that encodes the SMBUS Slave Address,
+ SMBUS Command, SMBUS Data Length, and PEC.
+ @param WriteBuffer Pointer to the buffer of bytes to write to the SMBUS.
+ @param ReadBuffer Pointer to the buffer of bytes to read from the SMBUS.
+ @param Status Return status for the executed command.
+ This is an optional parameter and may be NULL.
+
+ @return The number of bytes read from the SMBUS.
+
+**/
+UINTN
+InternalSmBusBlock (
+ IN UINT8 HostControl,
+ IN UINTN SmBusAddress,
+ IN UINT8 *WriteBuffer,
+ OUT UINT8 *ReadBuffer,
+ OUT RETURN_STATUS *Status
+ )
+{
+ RETURN_STATUS ReturnStatus;
+ UINTN Index;
+ UINTN BytesCount;
+ UINTN IoPortBaseAddress;
+ UINT8 AuxiliaryControl;
+
+ IoPortBaseAddress = InternalGetSmbusIoPortBaseAddress ();
+
+ BytesCount = SMBUS_LIB_LENGTH (SmBusAddress);
+
+ //
+ // Try to acquire the ownership of ICH SMBUS.
+ //
+ ReturnStatus = InternalSmBusAcquire (IoPortBaseAddress);
+ if (RETURN_ERROR (ReturnStatus)) {
+ goto Done;
+ }
+
+ //
+ // Set the appropriate Host Control Register and auxiliary Control Register.
+ //
+ AuxiliaryControl = B_PCH_SMBUS_E32B;
+ if (SMBUS_LIB_PEC (SmBusAddress)) {
+ AuxiliaryControl |= B_PCH_SMBUS_AAC;
+ HostControl |= B_PCH_SMBUS_PEC_EN;
+ }
+
+ //
+ // Set Host Command Register.
+ //
+ IoWrite8 (IoPortBaseAddress + R_PCH_SMBUS_HCMD, (UINT8) SMBUS_LIB_COMMAND (SmBusAddress));
+
+ //
+ // Set Auxiliary Control Regiester.
+ //
+ IoWrite8 (IoPortBaseAddress + R_PCH_SMBUS_AUXC, AuxiliaryControl);
+
+ //
+ // Clear byte pointer of 32-byte buffer.
+ //
+ IoRead8 (IoPortBaseAddress + R_PCH_SMBUS_HCTL);
+
+ if (WriteBuffer != NULL) {
+ //
+ // Write the number of block to Host Block Data Byte Register.
+ //
+ IoWrite8 (IoPortBaseAddress + R_PCH_SMBUS_HD0, (UINT8) BytesCount);
+
+ //
+ // Write data block to Host Block Data Register.
+ //
+ for (Index = 0; Index < BytesCount; Index++) {
+ IoWrite8 (IoPortBaseAddress + R_PCH_SMBUS_HBD, WriteBuffer[Index]);
+ }
+ }
+
+ //
+ // Set SMBUS slave address for the device to send/receive from.
+ //
+ IoWrite8 (IoPortBaseAddress + R_PCH_SMBUS_TSA, (UINT8) SmBusAddress);
+
+ //
+ // Start the SMBUS transaction and wait for the end.
+ //
+ ReturnStatus = InternalSmBusStart (IoPortBaseAddress, HostControl);
+ if (RETURN_ERROR (ReturnStatus)) {
+ goto Done;
+ }
+
+ if (ReadBuffer != NULL) {
+ //
+ // Read the number of block from host block data byte register.
+ //
+ BytesCount = IoRead8 (IoPortBaseAddress + R_PCH_SMBUS_HD0);
+
+ //
+ // Write data block from Host Block Data Register.
+ //
+ for (Index = 0; Index < BytesCount; Index++) {
+ ReadBuffer[Index] = IoRead8 (IoPortBaseAddress + R_PCH_SMBUS_HBD);
+ }
+ }
+
+Done:
+ //
+ // Clear Host Status Register and Auxiliary Status Register.
+ //
+ IoWrite8 (IoPortBaseAddress + R_PCH_SMBUS_HSTS, B_PCH_SMBUS_HSTS_ALL);
+ IoWrite8 (IoPortBaseAddress + R_PCH_SMBUS_AUXS, B_PCH_SMBUS_CRCE);
+
+ if (Status != NULL) {
+ *Status = ReturnStatus;
+ }
+
+ return BytesCount;
+}
+
+/**
+ Executes an SMBUS read block command.
+
+ Executes an SMBUS read block command on the SMBUS device specified by SmBusAddress.
+ Only the SMBUS slave address and SMBUS command fields of SmBusAddress are required.
+ Bytes are read from the SMBUS and stored in Buffer.
+ The number of bytes read is returned, and will never return a value larger than 32-bytes.
+ If Status is not NULL, then the status of the executed command is returned in Status.
+ It is the caller's responsibility to make sure Buffer is large enough for the total number of bytes read.
+ SMBUS supports a maximum transfer size of 32 bytes, so Buffer does not need to be any larger than 32 bytes.
+ If Length in SmBusAddress is not zero, then ASSERT().
+ If Buffer is NULL, then ASSERT().
+ If any reserved bits of SmBusAddress are set, then ASSERT().
+
+ @param SmBusAddress Address that encodes the SMBUS Slave Address,
+ SMBUS Command, SMBUS Data Length, and PEC.
+ @param Buffer Pointer to the buffer to store the bytes read from the SMBUS.
+ @param Status Return status for the executed command.
+ This is an optional parameter and may be NULL.
+
+ @return The number of bytes read.
+
+**/
+UINTN
+EFIAPI
+SmBusReadBlock (
+ IN UINTN SmBusAddress,
+ OUT VOID *Buffer,
+ OUT RETURN_STATUS *Status OPTIONAL
+ )
+{
+ UINTN BytesCount = 0;
+
+ ASSERT (Buffer != NULL);
+ ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) == 0);
+ ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0);
+
+
+ BytesCount = InternalSmBusBlock (
+ V_PCH_SMBUS_SMB_CMD_BLOCK,
+ SmBusAddress | B_PCH_SMBUS_RW_SEL_READ,
+ NULL,
+ Buffer,
+ Status
+ );
+ return BytesCount;
+
+}
+
+/**
+ Executes an SMBUS write block command.
+
+ Executes an SMBUS write block command on the SMBUS device specified by SmBusAddress.
+ The SMBUS slave address, SMBUS command, and SMBUS length fields of SmBusAddress are required.
+ Bytes are written to the SMBUS from Buffer.
+ The number of bytes written is returned, and will never return a value larger than 32-bytes.
+ If Status is not NULL, then the status of the executed command is returned in Status.
+ If Length in SmBusAddress is zero or greater than 32, then ASSERT().
+ If Buffer is NULL, then ASSERT().
+ If any reserved bits of SmBusAddress are set, then ASSERT().
+
+ @param SmBusAddress Address that encodes the SMBUS Slave Address,
+ SMBUS Command, SMBUS Data Length, and PEC.
+ @param Buffer Pointer to the buffer to store the bytes read from the SMBUS.
+ @param Status Return status for the executed command.
+ This is an optional parameter and may be NULL.
+
+ @return The number of bytes written.
+
+**/
+UINTN
+EFIAPI
+SmBusWriteBlock (
+ IN UINTN SmBusAddress,
+ OUT VOID *Buffer,
+ OUT RETURN_STATUS *Status OPTIONAL
+ )
+{
+ UINTN BytesCount = 0;
+
+ ASSERT (Buffer != NULL);
+ ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) >= 1);
+ ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) <= 32);
+ ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0);
+
+
+ BytesCount = InternalSmBusBlock (
+
+ V_PCH_SMBUS_SMB_CMD_BLOCK,
+ SmBusAddress | B_PCH_SMBUS_RW_SEL_WRITE,
+ Buffer,
+ NULL,
+ Status
+ );
+
+ return BytesCount;
+}
+
+/**
+ Executes an SMBUS block process call command.
+
+ Executes an SMBUS block process call command on the SMBUS device specified by SmBusAddress.
+ The SMBUS slave address, SMBUS command, and SMBUS length fields of SmBusAddress are required.
+ Bytes are written to the SMBUS from WriteBuffer. Bytes are then read from the SMBUS into ReadBuffer.
+ If Status is not NULL, then the status of the executed command is returned in Status.
+ It is the caller's responsibility to make sure ReadBuffer is large enough for the total number of bytes read.
+ SMBUS supports a maximum transfer size of 32 bytes, so Buffer does not need to be any larger than 32 bytes.
+ If Length in SmBusAddress is zero or greater than 32, then ASSERT().
+ If WriteBuffer is NULL, then ASSERT().
+ If ReadBuffer is NULL, then ASSERT().
+ If any reserved bits of SmBusAddress are set, then ASSERT().
+
+ @param SmBusAddress Address that encodes the SMBUS Slave Address,
+ SMBUS Command, SMBUS Data Length, and PEC.
+ @param WriteBuffer Pointer to the buffer of bytes to write to the SMBUS.
+ @param ReadBuffer Pointer to the buffer of bytes to read from the SMBUS.
+ @param Status Return status for the executed command.
+ This is an optional parameter and may be NULL.
+
+ @return The number of bytes written.
+
+**/
+UINTN
+EFIAPI
+SmBusBlockProcessCall (
+ IN UINTN SmBusAddress,
+ IN VOID *WriteBuffer,
+ OUT VOID *ReadBuffer,
+ OUT RETURN_STATUS *Status OPTIONAL
+ )
+{
+ UINTN BytesCount = 0;
+
+ ASSERT (WriteBuffer != NULL);
+ ASSERT (ReadBuffer != NULL);
+ ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) >= 1);
+ ASSERT (SMBUS_LIB_LENGTH (SmBusAddress) <= 32);
+ ASSERT (SMBUS_LIB_RESERVED (SmBusAddress) == 0);
+
+ BytesCount = InternalSmBusBlock (
+ V_PCH_SMBUS_SMB_CMD_BLOCK_PROCESS,
+ SmBusAddress | B_PCH_SMBUS_RW_SEL_WRITE,
+ WriteBuffer,
+ ReadBuffer,
+ Status
+ );
+ return BytesCount;
+
+ }
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