xref: /freebsd/sys/dev/isci/scil/scic_io_request.h (revision f11c7f63056671247335df83a3fe80b94c6616ac)

/*-
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 * The full GNU General Public License is included in this distribution
 * in the file called LICENSE.GPL.
 *
 * BSD LICENSE
 *
 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
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 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 */
#ifndef _SCIC_IO_REQUEST_H_
#define _SCIC_IO_REQUEST_H_

/**
 * @file
 *
 * @brief This file contains the structures and interface methods that
 *        can be referenced and used by the SCI user for the SCI IO request
 *        object.
 *
 * @todo Determine the failure situations and return values.
 */

#ifdef __cplusplus
extern "C" {
#endif // __cplusplus

#include <dev/isci/scil/sci_types.h>
#include <dev/isci/scil/sci_status.h>
#include <dev/isci/scil/intel_sas.h>

/**
 * @struct SCIC_IO_SSP_PARAMETERS
 * @brief  This structure contains additional optional parameters for SSP
 *         IO requests.  These parameters are utilized with the
 *         scic_io_request_construct_advanced_ssp() method.
 *
 * @todo Add Block-guard/DIF, TLR
 */
typedef struct SCIC_IO_SSP_PARAMETERS
{
   /**
    * Data Integrity Format (DIF) is also known as protection information
    * or block-guard.  This sub-structure contains DIF specific feature
    * information for SSP IO requests.
    */
   struct
   {
      void * placeholder;
   } dif;

   /**
    * Transport Layer Retries (TLR) is an SSP protocol specific feature.
    * This sub-structure contains Transport Layer Retries (TLR) specific
    * feature information for SSP IO requests.
    */
   struct
   {
      void * placeholder;
   } tlr;

} SCIC_IO_SSP_PARAMETERS_T;

/**
 * @struct SCIC_IO_PARAMETERS
 * @brief  This structure contains additional optional parameters for
 *         STP/SATA IO requests.  These parameters are utilized with the
 *         scic_io_request_construct_advanced_sata() method.
 */
typedef struct SCIC_IO_SATA_PARAMETERS
{
   /**
    * This field indicates whether or not to construct the Scatter-Gather
    * List elements for the SATA request.  This is used in scenarios
    * where Scatter-gather-list processing/translation is done by the
    * user.
    */
   BOOL do_translate_sgl;

} SCIC_IO_SATA_PARAMETERS_T;

/**
 * @struct SCIC_PASSTHRU_REQUEST_CALLBACKS
 * @brief  This structure contains the pointer to the callback functions
 *         for constructing the passthrough request common to SSP, SMP and STP.
 *         This structure must be set by the win sci layer before the passthrough
 *         build is called
 *
 */
typedef struct SCIC_PASSTHRU_REQUEST_CALLBACKS
{
   /**
   * Function pointer to get the phy identifier for passthrough request.
   */
   U32 (*scic_cb_passthru_get_phy_identifier) ( void * , U8 *);
   /**
   * Function pointer to get the port identifier for passthrough request.
   */
   U32 (*scic_cb_passthru_get_port_identifier) ( void * , U8 *);
   /**
   * Function pointer to get the connection rate for passthrough request.
   */
   U32 (*scic_cb_passthru_get_connection_rate) ( void * , void *);
   /**
   * Function pointer to get the destination sas address for passthrough request.
   */
   void (*scic_cb_passthru_get_destination_sas_address) (void *, U8 **);
   /**
   * Function pointer to get the transfer length for passthrough request.
   */
   U32 (*scic_cb_passthru_get_transfer_length) (void *);
   /**
   * Function pointer to get the data direction for passthrough request.
   */
   U32 (*scic_cb_passthru_get_data_direction) (void *);

} SCIC_PASSTHRU_REQUEST_CALLBACKS_T;

/**
 * @struct SCIC_SSP_PASSTHRU_REQUEST_CALLBACKS
 * @brief  This structure contains the pointer to the callback functions
 *         for constructing the passthrough request specific to SSP.
 *         This structure must be set by the win sci layer before the passthrough
 *         build is called
 *
 */
typedef struct SCIC_SSP_PASSTHRU_REQUEST_CALLBACKS
{
   /**
   * Common callbacks for all Passthru requests
   */
   SCIC_PASSTHRU_REQUEST_CALLBACKS_T common_callbacks;
   /**
   * Function pointer to get the lun for passthrough request.
   */
   void (* scic_cb_ssp_passthru_get_lun) (void *, U8 **);
   /**
   * Function pointer to get the cdb
   */
   void (* scic_cb_ssp_passthru_get_cdb) ( void *, U32 *, U8 **, U32 *, U8 ** );
   /**
   * Function pointer to get the task attribute for passthrough request.
   */
   U32 (*scic_cb_ssp_passthru_get_task_attribute) (void *);
} SCIC_SSP_PASSTHRU_REQUEST_CALLBACKS_T;

/**
 * @struct SCIC_STP_PASSTHRU_REQUEST_CALLBACKS
 * @brief  This structure contains the pointer to the callback functions
 *         for constructing the passthrough request specific to STP.
 *         This structure must be set by the win sci layer before the passthrough
 *         build is called
 *
 */
typedef struct SCIC_STP_PASSTHRU_REQUEST_CALLBACKS
{
   /**
   * Common callbacks for all Passthru requests
   */
   SCIC_PASSTHRU_REQUEST_CALLBACKS_T common_callbacks;
   /**
   * Function pointer to get the protocol for passthrough request.
   */
   U8 (* scic_cb_stp_passthru_get_protocol) (void *);
   /**
   * Function pointer to get the resgister fis
   */
   void (* scic_cb_stp_passthru_get_register_fis) ( void *, U8 ** );
   /**
   * Function pointer to get the MULTIPLE_COUNT (bits 5,6,7 in Byte 1 in the SAT-specific SCSI extenstion in ATA Pass-through (0x85))
   */
   U8 (* scic_cb_stp_passthru_get_multiplecount) ( void *);
   /**
   * Function pointer to get the EXTEND (bit 0 in Byte 1 the SAT-specific SCSI extenstion in ATA Pass-through (0x85))
   */
   U8 (* scic_cb_stp_passthru_get_extend) ( void *);
   /**
   * Function pointer to get the CK_COND (bit 5 in Byte 2 the SAT-specific SCSI extenstion in ATA Pass-through (0x85))
   */
   U8 (* scic_cb_stp_passthru_get_ckcond) ( void *);
   /**
   * Function pointer to get the T_DIR (bit 3 in Byte 2 the SAT-specific SCSI extenstion in ATA Pass-through (0x85))
   */
   U8 (* scic_cb_stp_passthru_get_tdir) ( void *);
   /**
   * Function pointer to get the BYTE_BLOCK (bit 2 in Byte 2 the SAT-specific SCSI extenstion in ATA Pass-through (0x85))
   */
   U8 (* scic_cb_stp_passthru_get_byteblock) ( void *);
   /**
   * Function pointer to get the T_LENGTH (bits 0,1 in Byte 2 the SAT-specific SCSI extenstion in ATA Pass-through (0x85))
   */
   U8 (* scic_cb_stp_passthru_get_tlength) ( void *);

} SCIC_STP_PASSTHRU_REQUEST_CALLBACKS_T;

/**
 * @struct SCIC_SMP_PASSTHRU_REQUEST_CALLBACKS
 * @brief  This structure contains the pointer to the callback functions
 *         for constructing the passthrough request specific to SMP.
 *         This structure must be set by the win sci layer before the passthrough
 *         build is called
 *
 */
typedef struct SCIC_SMP_PASSTHRU_REQUEST_CALLBACKS
{
   /**
   * Common callbacks for all Passthru requests
   */
   SCIC_PASSTHRU_REQUEST_CALLBACKS_T common_callbacks;

   /**
   * Function pointer to get the length of the smp request and its length
   */
   U32 (* scic_cb_smp_passthru_get_request) ( void *, U8 ** );
   /**
   * Function pointer to get the frame type of the smp request
   */
   U8 (* scic_cb_smp_passthru_get_frame_type) ( void *);
   /**
   * Function pointer to get the function in the the smp request
   */
   U8 (* scic_cb_smp_passthru_get_function) ( void * );

   /**
   * Function pointer to get the "allocated response length" in the the smp request
   */
   U8 (* scic_cb_smp_passthru_get_allocated_response_length) ( void * );

} SCIC_SMP_PASSTHRU_REQUEST_CALLBACKS_T;

/**
 * @brief This enumeration specifies the transport protocol utilized
 *        for the request.
 */
typedef enum
{
   /**
    * This enumeration constant indicates that no protocol has yet been
    * set.
    */
   SCIC_NO_PROTOCOL,

   /**
    * This enumeration constant indicates that the protocol utilized
    * is the Serial Management Protocol.
    */
   SCIC_SMP_PROTOCOL,

   /**
    * This enumeration constant indicates that the protocol utilized
    * is the Serial SCSI Protocol.
    */
   SCIC_SSP_PROTOCOL,

   /**
    * This enumeration constant indicates that the protocol utilized
    * is the Serial-ATA Tunneling Protocol.
    */
   SCIC_STP_PROTOCOL

} SCIC_TRANSPORT_PROTOCOL;


/**
 * @brief This method simply returns the size required to build an SCI
 *        based IO request object.
 *
 * @return Return the size of the SCI IO request object.
 */
U32 scic_io_request_get_object_size(
   void
);

/**
 * @brief This method is called by the SCI user to construct all SCI Core
 *        IO requests.  Memory initialization and functionality common to
 *        all IO request types is performed in this method.
 *
 * @note  The SCI core implementation will create an association between
 *        the user IO request object and the core IO request object.
 *
 * @param[in]  scic_controller the handle to the core controller object
 *             for which to build an IO request.
 * @param[in]  scic_remote_device the handle to the core remote device
 *             object for which to build an IO request.
 * @param[in]  io_tag This parameter specifies the IO tag to be associated
 *             with this request.  If SCI_CONTROLLER_INVALID_IO_TAG is
 *             passed, then a copy of the request is built internally.  The
 *             request will be copied into the actual controller request
 *             memory when the IO tag is allocated internally during the
 *             scic_controller_start_io() method.
 * @param[in]  user_io_request_object This parameter specifies the user
 *             IO request to be utilized during IO construction.  This IO
 *             pointer will become the associated object for the core
 *             IO request object.
 * @param[in]  scic_io_request_memory This parameter specifies the memory
 *             location to be utilized when building the core request.
 * @param[out] new_scic_io_request_handle This parameter specifies a
 *             pointer to the handle the core will expect in further
 *             interactions with the core IO request object.
 *
 * @return Indicate if the controller successfully built the IO request.
 * @retval SCI_SUCCESS This value is returned if the IO request was
 *         successfully built.
 */
SCI_STATUS scic_io_request_construct(
   SCI_CONTROLLER_HANDLE_T      scic_controller,
   SCI_REMOTE_DEVICE_HANDLE_T   scic_remote_device,
   U16                          io_tag,
   void                       * user_io_request_object,
   void                       * scic_io_request_memory,
   SCI_IO_REQUEST_HANDLE_T    * new_scic_io_request_handle
);

/**
 * @brief This method is called by the SCI user to build an SSP
 *        IO request.
 *
 * @pre
 *        - The user must have previously called scic_io_request_construct()
 *          on the supplied IO request.
 *
 * @param[in]  scic_io_request This parameter specifies the handle to the
 *             io request object to be built.
 *
 * @return Indicate if the controller successfully built the IO request.
 * @retval SCI_SUCCESS This value is returned if the IO request was
 *         successfully built.
 * @retval SCI_FAILURE_UNSUPPORTED_PROTOCOL This value is returned if the
 *         remote_device does not support the SSP protocol.
 * @retval SCI_FAILURE_INVALID_ASSOCIATION This value is returned if the
 *         user did not properly set the association between the SCIC IO
 *         request and the user's IO request.  Please refer to the
 *         sci_object_set_association() routine for more
 *         information.
 */
SCI_STATUS scic_io_request_construct_basic_ssp(
   SCI_IO_REQUEST_HANDLE_T  scic_io_request
);

/**
 * @brief This method is called by the SCI user to build an SSP
 *        IO request with additional parameters that provide additional
 *        flexibility from the standard scic_io_request_construct_basic_ssp()
 *        method.
 *
 * @pre
 *        - The user must have previously called scic_io_request_construct()
 *          on the supplied IO request.
 *
 * @param[in]  scic_io_request This parameter specifies the handle to the
 *             io request object to be built.
 * @param[in]  io_parameters the additional parameter information to
 *             be added to the outgoing IO request.
 *
 * @return Indicate if the controller successfully built the IO request.
 * @retval SCI_SUCCESS This value is returned if the IO request was
 *         successfully built.
 * @retval SCI_FAILURE_UNSUPPORTED_PROTOCOL This value is returned if the
 *         remote_device does not support the SSP protocol.
 * @retval SCI_FAILURE_INVALID_ASSOCIATION This value is returned if the
 *         user did not properly set the association between the SCIC IO
 *         request and the user's IO request.  Please refer to the
 *         sci_object_set_association() routine for more
 *         information.
 *
 * @todo Determine the failure situations and return values.
 */
SCI_STATUS scic_io_request_construct_advanced_ssp(
   SCI_IO_REQUEST_HANDLE_T    scic_io_request,
   SCIC_IO_SSP_PARAMETERS_T * io_parameters
);

#if !defined(DISABLE_PASS_THROUGH)

/**
 * @brief This method will build an IO request based on the user information
 *        supplied in the pass-through IO request object.
 *
 * @param[in]  scic_io_request This parameter specifies the handle to the
 *             io request object to be built.
 *
 * @param[in]  ssp_passthru_cb This parameter specifies the pointer to
 *             the structure containing the callback to the function
 *             pointers to get the needed fields from the pass-through
 *             reqiest instead of SRB
 *
 * @return Indicate if the controller successfully built the IO request.
 * @retval SCI_SUCCESS This value is returned if the IO request was
 *         successfully built.
 * @retval SCI_FAILURE_INVALID_ASSOCIATION This value is returned if the
 *         user did not properly set the association between the SCIC IO
 *         request and the user's IO request.  Please refer to the
 *         sci_object_set_association() routine for more
 *         information.
 */
SCI_STATUS scic_io_request_construct_ssp_pass_through(
   void                       * scic_io_request_memory,
   SCIC_SSP_PASSTHRU_REQUEST_CALLBACKS_T *ssp_passthru_cb
);

#else // !defined(DISABLE_PASS_THROUGH)

#define scic_io_request_construct_ssp_pass_through(memory, cb) SCI_FAILURE

#endif // !defined(DISABLE_PASS_THROUGH)

/**
 * @brief This method is called by the SCI Core user to build an STP
 *        IO request.
 *
 * @pre
 *        - The user must have previously called scic_io_request_construct()
 *          on the supplied IO request.
 *
 * @param[in]  scic_io_request This parameter specifies the handle to the
 *             io request object to be built.
 *
 * @return Indicate if the controller successfully built the IO request.
 * @retval SCI_SUCCESS This value is returned if the IO request was
 *         successfully built.
 * @retval SCI_FAILURE_UNSUPPORTED_PROTOCOL This value is returned if the
 *         remote_device does not support the STP protocol.
 * @retval SCI_FAILURE_INVALID_ASSOCIATION This value is returned if the
 *         user did not properly set the association between the SCIC IO
 *         request and the user's IO request.  Please refer to the
 *         sci_object_set_association() routine for more
 *         information.
 */
SCI_STATUS scic_io_request_construct_basic_sata(
   SCI_IO_REQUEST_HANDLE_T  scic_io_request
);

/**
 * @brief This method is called by the SCI Core user to build an STP
 *        IO request.
 *
 * @pre
 *        - The user must have previously called scic_io_request_construct()
 *          on the supplied IO request.
 *
 * @param[in]  scic_io_request This parameter specifies the handle to the
 *             io request object to be built.
 *
 * @return Indicate if the controller successfully built the IO request.
 * @retval SCI_SUCCESS This value is returned if the IO request was
 *         successfully built.
 * @retval SCI_FAILURE_UNSUPPORTED_PROTOCOL This value is returned if the
 *         remote_device does not support the STP protocol.
 * @retval SCI_FAILURE_INVALID_ASSOCIATION This value is returned if the
 *         user did not properly set the association between the SCIC IO
 *         request and the user's IO request.  Please refer to the
 *         sci_object_set_association() routine for more
 *         information.
 */
SCI_STATUS scic_io_request_construct_advanced_sata(
   SCI_IO_REQUEST_HANDLE_T     scic_io_request,
   SCIC_IO_SATA_PARAMETERS_T * io_parameters
);

#if !defined(DISABLE_PASS_THROUGH)

/**
 * @brief This method is called by the SCI user to build an STP pass-through
 *        IO request.
 *
 * @pre
 *        - The user must have previously called scic_io_request_construct()
 *          on the supplied IO request.
 *
 * @param[in]  scic_io_request This parameter specifies the handle to the
 *             io request object to be built.
 *
 * @param[in]  passthru_cb This parameter specifies the pointer to the callback
 *             structure that contains the function pointers
 *
 * @return Indicate if the controller successfully built the IO request.
 */
SCI_STATUS scic_io_request_construct_sata_pass_through(
   SCI_IO_REQUEST_HANDLE_T  scic_io_request,
   SCIC_STP_PASSTHRU_REQUEST_CALLBACKS_T *passthru_cb

);

#else // !defined(DISABLE_PASS_THROUGH)

#define scic_io_request_construct_sata_pass_through(io, cb) SCI_FAILURE

#endif // !defined(DISABLE_PASS_THROUGH)

/**
 * @brief This method is called by the SCI user to build an SMP
 *        IO request.
 *
 * @pre
 *        - The user must have previously called scic_io_request_construct()
 *          on the supplied IO request.
 *
 * @param[in]  scic_io_request This parameter specifies the handle to the
 *             io request object to be built.
 *
 * @return Indicate if the controller successfully built the IO request.
 * @retval SCI_SUCCESS This value is returned if the IO request was
 *         successfully built.
 * @retval SCI_FAILURE_UNSUPPORTED_PROTOCOL This value is returned if the
 *         remote_device does not support the SMP protocol.
 * @retval SCI_FAILURE_INVALID_ASSOCIATION This value is returned if the
 *         user did not properly set the association between the SCIC IO
 *         request and the user's IO request.  Please refer to the
 *         sci_object_set_association() routine for more
 *         information.
 */
SCI_STATUS scic_io_request_construct_smp(
   SCI_IO_REQUEST_HANDLE_T  scic_io_request
);


/**
 * @brief This method is called by the SCI user to build an SMP pass-through
 *        IO request.
 *
 * @pre
 *        - The user must have previously called scic_io_request_construct()
 *          on the supplied IO request.
 *
 * @param[in]  scic_smp_request This parameter specifies the handle to the
 *             io request object to be built.
 *
 * @param[in]  passthru_cb This parameter specifies the pointer to the callback
 *             structure that contains the function pointers
 *
 * @return Indicate if the controller successfully built the IO request.
 */
SCI_STATUS scic_io_request_construct_smp_pass_through(
   SCI_IO_REQUEST_HANDLE_T  scic_smp_request,
   SCIC_SMP_PASSTHRU_REQUEST_CALLBACKS_T *passthru_cb
);

/**
 * @brief This method returns the controller specific IO/Task request status.
 *        These status values are unique to the specific controller being
 *        managed by the SCIC.
 *
 * @param[in]  io_request the handle to the IO or task management request
 *             object for which to retrieve the status.
 *
 * @return This method returns a value indicating the controller specific
 *         request status.
 */
U32 scic_request_get_controller_status(
   SCI_IO_REQUEST_HANDLE_T  io_request
);

/**
 * @brief This method returns the user specific IO/Task request status.
 *
 * @param[in]  io_request the handle to the IO or task management request
 *             object for which to retrieve the status.
 *
 * @return This method returns a value indicating the user specific
 *         request status.
 */
U32 scic_request_get_sci_status(
   SCI_IO_REQUEST_HANDLE_T  io_request
);


/**
 * @brief This method will return the address to the command information
 *        unit.
 *
 * @param[in]  scic_io_request This parameter specifies the handle to the
 *             io request object to be built.
 *
 * @return The address of the SSP/SMP command information unit.
 */
void * scic_io_request_get_command_iu_address(
   SCI_IO_REQUEST_HANDLE_T  scic_io_request
);

/**
 * @brief This method will return the address to the response information
 *        unit.  For an SSP request this buffer is only valid if the IO
 *        request is completed with the status SCI_FAILURE_IO_RESPONSE_VALID.
 *
 * @param[in]  scic_io_request This parameter specifies the handle to the
 *             io request object to be built.
 *
 * @return The address of the SSP/SMP response information unit.
 */
void * scic_io_request_get_response_iu_address(
   SCI_IO_REQUEST_HANDLE_T  scic_io_request
);

/**
 * @brief This method will return the IO tag utilized by the IO request.
 *
 * @param[in]  scic_io_request This parameter specifies the handle to the
 *             io request object for which to return the IO tag.
 *
 * @return An unsigned integer representing the IO tag being utilized.
 * @retval SCI_CONTROLLER_INVALID_IO_TAG This value is returned if the IO
 *         does not currently have an IO tag allocated to it.
 * @retval All return other values indicate a legitimate tag.
 */
U16 scic_io_request_get_io_tag(
   SCI_IO_REQUEST_HANDLE_T  scic_io_request
);

/**
 * @brief This method will inform the user of the protocol with which
 *        the supplied IO request was created.
 *
 * @param[in]  scic_io_request This parameter specifies the IO request
 *             for which to retrieve the protocol.
 *
 * @return This method returns the transport protocol utilized for the
 *         the supplied request.  Please refer to SCIC_TRANSPORT_PROTOCOL
 *         for more information.
 */
SCIC_TRANSPORT_PROTOCOL scic_io_request_get_protocol(
   SCI_IO_REQUEST_HANDLE_T  scic_io_request
);

/**
 * @brief This method will assign an NCQ tag to the io request object.  The
 *        caller of this function must make sure that only valid NCQ tags are
 *        assigned to the io request object.
 *
 * @param[in]  scic_io_request This parameter specifies the handle to the
 *             io request object to which to assign the ncq tag.
 * @param[in]  ncq_tag This parameter specifies the NCQ tag to be utilized
 *             for the supplied core IO request.  It is up to the user to make
 *             sure that this is a valid NCQ tag.
 *
 * @return none
 *
 * @note This function is only valid for SATA NCQ requests.
 */
void scic_stp_io_request_set_ncq_tag(
   SCI_IO_REQUEST_HANDLE_T  scic_io_request,
   U16                      ncq_tag
);

/**
 * @brief This method will return the address of the host to device register
 *        fis region for the io request object.
 *
 * @param[in] scic_io_request This parameter specifies the handle to the io
 *       request object from which to get the host to device register fis
 *       buffer.
 *
 * @return The address of the host to device register fis buffer in the io
 *         request object.
 *
 * @note This function is only valid for SATA requests.
 */
void * scic_stp_io_request_get_h2d_reg_address(
   SCI_IO_REQUEST_HANDLE_T  scic_io_request
);

/**
 * @brief This method will return the address of the device to host register
 *        fis region for the io request object.
 *
 * @param[in] scic_io_request This parameter specifies teh handle to the io
 *       request object from which to get the device to host register fis
 *       buffer.
 *
 * @return The address fo the device to host register fis ending the io
 *         request.
 *
 * @note This function is only valid for SATA requests.
 */
void * scic_stp_io_request_get_d2h_reg_address(
   SCI_IO_REQUEST_HANDLE_T  scic_io_request
);

/**
 * @brief This method will return the rx frame for the io request object that
 *        contains the given offset.
 *
 * @param[in] scic_io_request This parameter specifies the handle to the io
 *       request object which has received the frame data.
 * @param[in] offset This parameter specifies which frame is being requested.
 *
 * @return The return is a pointer to the frame buffer data.
 *
 * @note Frame buffers are only 1024 bytes in size.  Reading past the end of a
 *       frame will have unexpected results.
 */
void * scic_io_request_get_rx_frame(
   SCI_IO_REQUEST_HANDLE_T  scic_io_request,
   U32                      offset
);

/**
 * @brief This method will return the number of bytes transferred from the SCU
 *
 * @param[in] scic_io_request This parameter specifies the handle to the io request
 *            whose data length was not eqaul to the data length specified in the request.
 *            When the driver gets an early io completion status from the hardware,
 *            this routine should be called to get the actual number of bytes transferred
 *
 * @return The return is the number of bytes transferred when the data legth is not equal to
 *         the specified length in the io request
 *
 */
U32 scic_io_request_get_number_of_bytes_transferred (
   SCI_IO_REQUEST_HANDLE_T  scic_io_request
);

#ifdef __cplusplus
}
#endif // __cplusplus

#endif // _SCIC_IO_REQUEST_H_