path: root/src/usr/spd/spd.H

//  IBM_PROLOG_BEGIN_TAG
//  This is an automatically generated prolog.
//
//  $Source: src/usr/spd/spd.H $
//
//  IBM CONFIDENTIAL
//
//  COPYRIGHT International Business Machines Corp. 2012
//
//  p1
//
//  Object Code Only (OCO) source materials
//  Licensed Internal Code Source Materials
//  IBM HostBoot Licensed Internal Code
//
//  The source code for this program is not published or other-
//  wise divested of its trade secrets, irrespective of what has
//  been deposited with the U.S. Copyright Office.
//
//  Origin: 30
//
//  IBM_PROLOG_END
#ifndef __SPD_H
#define __SPD_H

/**
 * @file spd.H
 *
 * @brief Provides the interfaces for the SPD device driver
 *
 */

// ----------------------------------------------
// Includes
// ----------------------------------------------
#include <errl/errlentry.H>

namespace SPD
{

/**
* @brief Miscellaneous enumerations for SPD
*/
enum
{
    MEM_TYPE_ADDR = 0x2,        // DIMM Basic Memory Type address
    MEM_TYPE_ADDR_SZ = 0x1,     // DIMM Basic Memory Type address size

    // Basic Memory Type Enumerations
    SPD_DDR3 = 0xB,
    SPD_DDR4 = 0xC,  // TODO - Proposed value from draft Spec.
};

/**
* @brief Structure to define the lookup table for SPD keywords
*       for DIMMs.
*/
struct KeywordData
{
    uint16_t keyword;   // SPD keyword this data corresponds to
    uint8_t offset;     // Byte offset in the SPD data
    uint8_t length;     // Number of bytes to retrieve
    bool useBitMask;    // Use the bitmask to mask off bits, if true, length must be
                        //      l byte, unless it is a "special" case
    uint8_t bitMask;    // Bit mask
    uint8_t shift;      // Used for fields < 1 byte to right justify all values.
    bool isSpecialCase; // Whether or not this entry is a special case.
};


/**
*
* @brief Perform an SPD operation.  It follows a pre-defined
*       prototype function in order to be registered with the device
*       driver framework.
*
* @param[in] i_opType - Operation Type - See DeviceFW::OperationType in
*       driververif.H
*
* @param[in] i_target - DIMM Target device
*
* @param [in/out] io_buffer - Pointer to the data that was read from
*       the target device.  It will also be used to contain data to
*       be written to the device.
*
* @param [in/out] io_buflen - Length of the buffer to be read or written
*       to/from the target.  This value should indicate the size of the
*       io_buffer parameter that has been allocated.  Being returned it will
*       indicate the number of valid bytes in the buffer being returned.
*
* @param [in] i_accessType - Access Type - See DeviceFW::AccessType in
*       usrif.H
*
* @param [in] i_args - This is an argument list for the device driver
*       framework.
*
* @return errlHndl_t - NULL if successful, otherwise a pointer to the
*       error log.
*
*/
errlHndl_t spdAccess ( DeviceFW::OperationType i_opType,
                       TARGETING::Target * i_target,
                       void * io_buffer,
                       size_t & io_buflen,
                       int64_t i_accessType,
                       va_list i_args );

/**
 * @brief This function is used to read SPD keywords from collected
 *      SPD data for the given target
 *
 * @param[in] i_keyword - The SPD keyword to access.
 *
 * @param[in/out] io_buffer - The buffer that will contain the data
 *      read from the SPD data.
 *
 * @param[in/out] io_buflen - The requested number of bytes to read.
 *      The actual number of bytes read will be returned.
 *
 * @param[in] i_target - The target DIMM to access the data for.
 *
 * @return errlHndl_t - NULL if successful, otherwise a pointer to the
 *      error log.
 */
errlHndl_t spdGetKeywordValue ( uint64_t i_keyword,
                                void * io_buffer,
                                size_t & io_buflen,
                                TARGETING::Target * i_target );

/**
 * @brief This function is used to write SPD keyword values.
 *
 * @param[in] i_keyword - The SPD keyword to access.
 *
 * @param[in/out] io_buffer - The buffer that will contain the data
 *      read from the SPD data.
 *
 * @param[in/out] io_buflen - The requested number of bytes to read.
 *      The actual number of bytes read will be returned.
 *
 * @param[in] i_target - The target DIMM to access the data for.
 *
 * @return errlHndl_t - NULL if successful, otherwise a pointer to the
 *      error log.
 */
errlHndl_t spdWriteKeywordValue ( uint64_t i_keyword,
                                  void * io_buffer,
                                  size_t & io_buflen,
                                  TARGETING::Target * i_target );

/**
 * @param This function is a wrapper for reading the correct keyword.
 *      It will route the read to whatever function has the latest
 *      supported access code.
 *
 * @param[in] i_byteAddress - The offset into the JEDEC SPD layout.
 *
 * @param[in] i_numbytes - Number of bytes to read.
 *
 * @param[out] o_data - The data buffer that will return the data read.
 *
 * @param[in] i_target - The target DIMM to access.
 *
 * @return errlHndl_t - NULL if successful, otherwise a pointer to the
 *      error log.
 */
errlHndl_t spdFetchData ( uint64_t i_byteAddr,
                          size_t i_numBytes,
                          void * o_data,
                          TARGETING::Target * i_target );

/**
 * @param This function will read the SPD keyword from the appropriate
 *      table.
 *
 * @param[in] i_keyword - The SPD keyword to access.
 *
 * @param[in/out] io_buffer - The buffer that will contain the data
 *      read from the SPD data.
 *
 * @param[in/out] io_buflen - The requested number of bytes to read.
 *      The actual number of bytes read will be returned.
 *
 * @param[in] i_target - The target DIMM to access the data for.
 *
 * @param[in] i_DDRRev - The DIMM DDR Revision.
 *
 * @return errlHndl_t - NULL if successful, otherwise a pointer to the
 *      error log.
 */
errlHndl_t spdGetValue ( uint64_t i_keyword,
                         void * io_buffer,
                         size_t & io_buflen,
                         TARGETING::Target * i_target,
                         uint64_t i_DDRRev );

/**
 * @param This function handles the special case keywords where
 *      the data isn't sequential, or is broken up between two different
 *      offsets within the layout.
 *
 * @param[in] i_kwdData - The SPD keyword to access.
 *
 * @param[in/out] io_buffer - The buffer that will contain the data
 *      read from the SPD data.
 *
 * @param[in/out] io_buflen - The requested number of bytes to read.
 *      The actual number of bytes read will be returned.
 *
 * @param[in] i_target - The target DIMM to access the data for.
 *
 * @return errlHndl_t - NULL if successful, otherwise a pointer to the
 *      error log.
 */
errlHndl_t spdSpecialCases ( KeywordData i_kwdData,
                             void * io_buffer,
                             size_t & io_buflen,
                             TARGETING::Target * i_target,
                             uint64_t i_DDRRev );

/**
 * @brief This function checks to make sure that the buffer allocated
 *      is large enough to hold the data that needs to be returned.
 *
 * @param[in] i_bufferSz - The size of the buffer passed in by the caller.
 *
 * @param[in] i_expBufferSz - The expected buffer size for the keyword
 *      requested.
 *
 * @param[in] i_keyword - The SPD Keyword requested.
 *
 * @return errlHndl_t - NULL if successful, otherwise a pointer to the
 *      error log.
 */
errlHndl_t spdCheckSize ( size_t i_bufferSz,
                          size_t i_expBufferSz,
                          uint64_t i_keyword );

/**
 * @brief This function will read a binary file from PNOR.  This is
 *      not the long term solution, but mainly for initial testing.
 *
 * @param[in] i_byteAddr - The byte offset into the SPD layout.
 *
 * @param[in] i_bytes - Number of bytes to access.
 *
 * @param[out] o_data - The data buffer containing the data read.
 *
 * @return errlHndl_t - NULL if successful, otherwise a pointer to the
 *      error log.
 */
errlHndl_t spdReadBinaryFile ( uint64_t i_byteAddr,
                               size_t i_numBytes,
                               void * o_data );

/**
 * @brief This function performs the presence detect for all DIMMs.
 *
 * @param[in] i_opType - Operation type, see DeviceFW::OperationType
 *      in driverif.H
 *
 * @param[in] i_target - The target to query.
 *
 * @param[in/out] io_buffer - Buffer to contain the boolean for presence
 *      detect.
 *
 * @param[in/out] io_buflen - Size of buffer provided for doing the presence
 *      detect.  Will always be 1.  If size returned equals 0, the request
 *      failed.
 *
 * @param[in] i_accessType - DeviceFW::AccessType enum.
 *
 * @param[in] i_args - An arguement for the Device Driver framework.  There
 *      are no args for this function.
 *
 * @return errlHndl_t - NULL if successful, otherwise a pointer to the
 *      error log.
 */
errlHndl_t dimmPresenceDetect( DeviceFW::OperationType i_opType,
                               TARGETING::Target * i_target,
                               void * io_buffer,
                               size_t & io_buflen,
                               int64_t i_accessType,
                               va_list i_args );

}; // end SPD namespace

#endif  // __SPD_H