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 /*
  * 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
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  *     contributors may be used to endorse or promote products derived
  *     from this software without specific prior written permission.
  *
  * 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,
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  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef _SCU_TASK_CONTEXT_H_
 #define _SCU_TASK_CONTEXT_H_
 
 /**
  * This file contains the structures and constants for the SCU hardware task
  *    context.
  *
  *
  */
 
 
 /**
  * enum scu_ssp_task_type - This enumberation defines the various SSP task
  *    types the SCU hardware will accept. The definition for the various task
  *    types the SCU hardware will accept can be found in the DS specification.
  *
  *
  */
 typedef enum {
     SCU_TASK_TYPE_IOREAD,           /* /< IO READ direction or no direction */
     SCU_TASK_TYPE_IOWRITE,          /* /< IO Write direction */
     SCU_TASK_TYPE_SMP_REQUEST,      /* /< SMP Request type */
     SCU_TASK_TYPE_RESPONSE,         /* /< Driver generated response frame (targt mode) */
     SCU_TASK_TYPE_RAW_FRAME,        /* /< Raw frame request type */
     SCU_TASK_TYPE_PRIMITIVE         /* /< Request for a primitive to be transmitted */
 } scu_ssp_task_type;
 
 /**
  * enum scu_sata_task_type - This enumeration defines the various SATA task
  *    types the SCU hardware will accept. The definition for the various task
  *    types the SCU hardware will accept can be found in the DS specification.
  *
  *
  */
 typedef enum {
     SCU_TASK_TYPE_DMA_IN,           /* /< Read request */
     SCU_TASK_TYPE_FPDMAQ_READ,      /* /< NCQ read request */
     SCU_TASK_TYPE_PACKET_DMA_IN,    /* /< Packet read request */
     SCU_TASK_TYPE_SATA_RAW_FRAME,   /* /< Raw frame request */
     RESERVED_4,
     RESERVED_5,
     RESERVED_6,
     RESERVED_7,
     SCU_TASK_TYPE_DMA_OUT,          /* /< Write request */
     SCU_TASK_TYPE_FPDMAQ_WRITE,     /* /< NCQ write Request */
     SCU_TASK_TYPE_PACKET_DMA_OUT    /* /< Packet write request */
 } scu_sata_task_type;
 
 
 /**
  *
  *
  * SCU_CONTEXT_TYPE
  */
 #define SCU_TASK_CONTEXT_TYPE  0
 #define SCU_RNC_CONTEXT_TYPE   1
 
 /**
  *
  *
  * SCU_TASK_CONTEXT_VALIDITY
  */
 #define SCU_TASK_CONTEXT_INVALID          0
 #define SCU_TASK_CONTEXT_VALID            1
 
 /**
  *
  *
  * SCU_COMMAND_CODE
  */
 #define SCU_COMMAND_CODE_INITIATOR_NEW_TASK   0
 #define SCU_COMMAND_CODE_ACTIVE_TASK          1
 #define SCU_COMMAND_CODE_PRIMITIVE_SEQ_TASK   2
 #define SCU_COMMAND_CODE_TARGET_RAW_FRAMES    3
 
 /**
  *
  *
  * SCU_TASK_PRIORITY
  */
 /**
  *
  *
  * This priority is used when there is no priority request for this request.
  */
 #define SCU_TASK_PRIORITY_NORMAL          0
 
 /**
  *
  *
  * This priority indicates that the task should be scheduled to the head of the
  * queue.  The task will NOT be executed if the TX is suspended for the remote
  * node.
  */
 #define SCU_TASK_PRIORITY_HEAD_OF_Q       1
 
 /**
  *
  *
  * This priority indicates that the task will be executed before all
  * SCU_TASK_PRIORITY_NORMAL and SCU_TASK_PRIORITY_HEAD_OF_Q tasks. The task
  * WILL be executed if the TX is suspended for the remote node.
  */
 #define SCU_TASK_PRIORITY_HIGH            2
 
 /**
  *
  *
  * This task priority is reserved and should not be used.
  */
 #define SCU_TASK_PRIORITY_RESERVED        3
 
 #define SCU_TASK_INITIATOR_MODE           1
 #define SCU_TASK_TARGET_MODE              0
 
 #define SCU_TASK_REGULAR                  0
 #define SCU_TASK_ABORTED                  1
 
 /* direction bit defintion */
 /**
  *
  *
  * SATA_DIRECTION
  */
 #define SCU_SATA_WRITE_DATA_DIRECTION     0
 #define SCU_SATA_READ_DATA_DIRECTION      1
 
 /**
  *
  *
  * SCU_COMMAND_CONTEXT_MACROS These macros provide the mask and shift
  * operations to construct the various SCU commands
  */
 #define SCU_CONTEXT_COMMAND_REQUEST_TYPE_SHIFT           21
 #define SCU_CONTEXT_COMMAND_REQUEST_TYPE_MASK            0x00E00000
 #define scu_get_command_request_type(x) \
     ((x) & SCU_CONTEXT_COMMAND_REQUEST_TYPE_MASK)
 
 #define SCU_CONTEXT_COMMAND_REQUEST_SUBTYPE_SHIFT        18
 #define SCU_CONTEXT_COMMAND_REQUEST_SUBTYPE_MASK         0x001C0000
 #define scu_get_command_request_subtype(x) \
     ((x) & SCU_CONTEXT_COMMAND_REQUEST_SUBTYPE_MASK)
 
 #define SCU_CONTEXT_COMMAND_REQUEST_FULLTYPE_MASK    \
     (\
         SCU_CONTEXT_COMMAND_REQUEST_TYPE_MASK         \
         | SCU_CONTEXT_COMMAND_REQUEST_SUBTYPE_MASK      \
     )
 #define scu_get_command_request_full_type(x) \
     ((x) & SCU_CONTEXT_COMMAND_REQUEST_FULLTYPE_MASK)
 
 #define SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT  16
 #define SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_MASK   0x00010000
 #define scu_get_command_protocl_engine_group(x) \
     ((x) & SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_MASK)
 
 #define SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT           12
 #define SCU_CONTEXT_COMMAND_LOGICAL_PORT_MASK            0x00007000
 #define scu_get_command_reqeust_logical_port(x) \
     ((x) & SCU_CONTEXT_COMMAND_LOGICAL_PORT_MASK)
 
 
 #define MAKE_SCU_CONTEXT_COMMAND_TYPE(type) \
     ((u32)(type) << SCU_CONTEXT_COMMAND_REQUEST_TYPE_SHIFT)
 
 /**
  * MAKE_SCU_CONTEXT_COMMAND_TYPE() -
  *
  * SCU_COMMAND_TYPES These constants provide the grouping of the different SCU
  * command types.
  */
 #define SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC    MAKE_SCU_CONTEXT_COMMAND_TYPE(0)
 #define SCU_CONTEXT_COMMAND_REQUEST_TYPE_DUMP_TC    MAKE_SCU_CONTEXT_COMMAND_TYPE(1)
 #define SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_RNC   MAKE_SCU_CONTEXT_COMMAND_TYPE(2)
 #define SCU_CONTEXT_COMMAND_REQUEST_TYPE_DUMP_RNC   MAKE_SCU_CONTEXT_COMMAND_TYPE(3)
 #define SCU_CONTEXT_COMMAND_REQUEST_TYPE_OTHER_RNC  MAKE_SCU_CONTEXT_COMMAND_TYPE(6)
 
 #define MAKE_SCU_CONTEXT_COMMAND_REQUEST(type, command) \
     ((type) | ((command) << SCU_CONTEXT_COMMAND_REQUEST_SUBTYPE_SHIFT))
 
 /**
  *
  *
  * SCU_REQUEST_TYPES These constants are the various request types that can be
  * posted to the SCU hardware.
  */
 #define SCU_CONTEXT_COMMAND_REQUST_POST_TC \
     (MAKE_SCU_CONTEXT_COMMAND_REQUEST(SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC, 0))
 
 #define SCU_CONTEXT_COMMAND_REQUEST_POST_TC_ABORT \
     (MAKE_SCU_CONTEXT_COMMAND_REQUEST(SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC, 1))
 
 #define SCU_CONTEXT_COMMAND_REQUST_DUMP_TC \
     (MAKE_SCU_CONTEXT_COMMAND_REQUEST(SCU_CONTEXT_COMMAND_REQUEST_TYPE_DUMP_TC, 0))
 
 #define SCU_CONTEXT_COMMAND_POST_RNC_32 \
     (MAKE_SCU_CONTEXT_COMMAND_REQUEST(SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_RNC, 0))
 
 #define SCU_CONTEXT_COMMAND_POST_RNC_96 \
     (MAKE_SCU_CONTEXT_COMMAND_REQUEST(SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_RNC, 1))
 
 #define SCU_CONTEXT_COMMAND_POST_RNC_INVALIDATE \
     (MAKE_SCU_CONTEXT_COMMAND_REQUEST(SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_RNC, 2))
 
 #define SCU_CONTEXT_COMMAND_DUMP_RNC_32 \
     (MAKE_SCU_CONTEXT_COMMAND_REQUEST(SCU_CONTEXT_COMMAND_REQUEST_TYPE_DUMP_RNC, 0))
 
 #define SCU_CONTEXT_COMMAND_DUMP_RNC_96 \
     (MAKE_SCU_CONTEXT_COMMAND_REQUEST(SCU_CONTEXT_COMMAND_REQUEST_TYPE_DUMP_RNC, 1))
 
 #define SCU_CONTEXT_COMMAND_POST_RNC_SUSPEND_TX \
     (MAKE_SCU_CONTEXT_COMMAND_REQUEST(SCU_CONTEXT_COMMAND_REQUEST_TYPE_OTHER_RNC, 0))
 
 #define SCU_CONTEXT_COMMAND_POST_RNC_SUSPEND_TX_RX \
     (MAKE_SCU_CONTEXT_COMMAND_REQUEST(SCU_CONTEXT_COMMAND_REQUEST_TYPE_OTHER_RNC, 1))
 
 #define SCU_CONTEXT_COMMAND_POST_RNC_RESUME \
     (MAKE_SCU_CONTEXT_COMMAND_REQUEST(SCU_CONTEXT_COMMAND_REQUEST_TYPE_OTHER_RNC, 2))
 
 #define SCU_CONTEXT_IT_NEXUS_LOSS_TIMER_ENABLE \
     (MAKE_SCU_CONTEXT_COMMAND_REQUEST(SCU_CONTEXT_COMMAND_REQUEST_TYPE_OTHER_RNC, 3))
 
 #define SCU_CONTEXT_IT_NEXUS_LOSS_TIMER_DISABLE \
     (MAKE_SCU_CONTEXT_COMMAND_REQUEST(SCU_CONTEXT_COMMAND_REQUEST_TYPE_OTHER_RNC, 4))
 
 /**
  *
  *
  * SCU_TASK_CONTEXT_PROTOCOL SCU Task context protocol types this is uesd to
  * program the SCU Task context protocol field in word 0x00.
  */
 #define SCU_TASK_CONTEXT_PROTOCOL_SMP    0x00
 #define SCU_TASK_CONTEXT_PROTOCOL_SSP    0x01
 #define SCU_TASK_CONTEXT_PROTOCOL_STP    0x02
 #define SCU_TASK_CONTEXT_PROTOCOL_NONE   0x07
 
 /**
  * struct ssp_task_context - This is the SCU hardware definition for an SSP
  *    request.
  *
  *
  */
 struct ssp_task_context {
     /* OFFSET 0x18 */
     u32 reserved00:24;
     u32 frame_type:8;
 
     /* OFFSET 0x1C */
     u32 reserved01;
 
     /* OFFSET 0x20 */
     u32 fill_bytes:2;
     u32 reserved02:6;
     u32 changing_data_pointer:1;
     u32 retransmit:1;
     u32 retry_data_frame:1;
     u32 tlr_control:2;
     u32 reserved03:19;
 
     /* OFFSET 0x24 */
     u32 uiRsvd4;
 
     /* OFFSET 0x28 */
     u32 target_port_transfer_tag:16;
     u32 tag:16;
 
     /* OFFSET 0x2C */
     u32 data_offset;
 };
 
 /**
  * struct stp_task_context - This is the SCU hardware definition for an STP
  *    request.
  *
  *
  */
 struct stp_task_context {
     /* OFFSET 0x18 */
     u32 fis_type:8;
     u32 pm_port:4;
     u32 reserved0:3;
     u32 control:1;
     u32 command:8;
     u32 features:8;
 
     /* OFFSET 0x1C */
     u32 reserved1;
 
     /* OFFSET 0x20 */
     u32 reserved2;
 
     /* OFFSET 0x24 */
     u32 reserved3;
 
     /* OFFSET 0x28 */
     u32 ncq_tag:5;
     u32 reserved4:27;
 
     /* OFFSET 0x2C */
     u32 data_offset; /* TODO: What is this used for? */
 };
 
 /**
  * struct smp_task_context - This is the SCU hardware definition for an SMP
  *    request.
  *
  *
  */
 struct smp_task_context {
     /* OFFSET 0x18 */
     u32 response_length:8;
     u32 function_result:8;
     u32 function:8;
     u32 frame_type:8;
 
     /* OFFSET 0x1C */
     u32 smp_response_ufi:12;
     u32 reserved1:20;
 
     /* OFFSET 0x20 */
     u32 reserved2;
 
     /* OFFSET 0x24 */
     u32 reserved3;
 
     /* OFFSET 0x28 */
     u32 reserved4;
 
     /* OFFSET 0x2C */
     u32 reserved5;
 };
 
 /**
  * struct primitive_task_context - This is the SCU hardware definition used
  *    when the driver wants to send a primitive on the link.
  *
  *
  */
 struct primitive_task_context {
     /* OFFSET 0x18 */
     /**
      * This field is the control word and it must be 0.
      */
     u32 control; /* /< must be set to 0 */
 
     /* OFFSET 0x1C */
     /**
      * This field specifies the primitive that is to be transmitted.
      */
     u32 sequence;
 
     /* OFFSET 0x20 */
     u32 reserved0;
 
     /* OFFSET 0x24 */
     u32 reserved1;
 
     /* OFFSET 0x28 */
     u32 reserved2;
 
     /* OFFSET 0x2C */
     u32 reserved3;
 };
 
 /**
  * The union of the protocols that can be selected in the SCU task context
  *    field.
  *
  * protocol_context
  */
 union protocol_context {
     struct ssp_task_context ssp;
     struct stp_task_context stp;
     struct smp_task_context smp;
     struct primitive_task_context primitive;
     u32 words[6];
 };
 
 /**
  * struct scu_sgl_element - This structure represents a single SCU defined SGL
  *    element. SCU SGLs contain a 64 bit address with the maximum data transfer
  *    being 24 bits in size.  The SGL can not cross a 4GB boundary.
  *
  * struct scu_sgl_element
  */
 struct scu_sgl_element {
     /**
      * This field is the upper 32 bits of the 64 bit physical address.
      */
     u32 address_upper;
 
     /**
      * This field is the lower 32 bits of the 64 bit physical address.
      */
     u32 address_lower;
 
     /**
      * This field is the number of bytes to transfer.
      */
     u32 length:24;
 
     /**
      * This field is the address modifier to be used when a virtual function is
      * requesting a data transfer.
      */
     u32 address_modifier:8;
 
 };
 
 #define SCU_SGL_ELEMENT_PAIR_A   0
 #define SCU_SGL_ELEMENT_PAIR_B   1
 
 /**
  * struct scu_sgl_element_pair - This structure is the SCU hardware definition
  *    of a pair of SGL elements. The SCU hardware always works on SGL pairs.
  *    They are refered to in the DS specification as SGL A and SGL B.  Each SGL
  *    pair is followed by the address of the next pair.
  *
  *
  */
 struct scu_sgl_element_pair {
     /* OFFSET 0x60-0x68 */
     /**
      * This field is the SGL element A of the SGL pair.
      */
     struct scu_sgl_element A;
 
     /* OFFSET 0x6C-0x74 */
     /**
      * This field is the SGL element B of the SGL pair.
      */
     struct scu_sgl_element B;
 
     /* OFFSET 0x78-0x7C */
     /**
      * This field is the upper 32 bits of the 64 bit address to the next SGL
      * element pair.
      */
     u32 next_pair_upper;
 
     /**
      * This field is the lower 32 bits of the 64 bit address to the next SGL
      * element pair.
      */
     u32 next_pair_lower;
 
 };
 
 /**
  * struct transport_snapshot - This structure is the SCU hardware scratch area
  *    for the task context. This is set to 0 by the driver but can be read by
  *    issuing a dump TC request to the SCU.
  *
  *
  */
 struct transport_snapshot {
     /* OFFSET 0x48 */
     u32 xfer_rdy_write_data_length;
 
     /* OFFSET 0x4C */
     u32 data_offset;
 
     /* OFFSET 0x50 */
     u32 data_transfer_size:24;
     u32 reserved_50_0:8;
 
     /* OFFSET 0x54 */
     u32 next_initiator_write_data_offset;
 
     /* OFFSET 0x58 */
     u32 next_initiator_write_data_xfer_size:24;
     u32 reserved_58_0:8;
 };
 
 /**
  * struct scu_task_context - This structure defines the contents of the SCU
  *    silicon task context. It lays out all of the fields according to the
  *    expected order and location for the Storage Controller unit.
  *
  *
  */
 struct scu_task_context {
     /* OFFSET 0x00 ------ */
     /**
      * This field must be encoded to one of the valid SCU task priority values
      *    - SCU_TASK_PRIORITY_NORMAL
      *    - SCU_TASK_PRIORITY_HEAD_OF_Q
      *    - SCU_TASK_PRIORITY_HIGH
      */
     u32 priority:2;
 
     /**
      * This field must be set to true if this is an initiator generated request.
      * Until target mode is supported all task requests are initiator requests.
      */
     u32 initiator_request:1;
 
     /**
      * This field must be set to one of the valid connection rates valid values
      * are 0x8, 0x9, and 0xA.
      */
     u32 connection_rate:4;
 
     /**
      * This field muse be programed when generating an SMP response since the SMP
      * connection remains open until the SMP response is generated.
      */
     u32 protocol_engine_index:3;
 
     /**
      * This field must contain the logical port for the task request.
      */
     u32 logical_port_index:3;
 
     /**
      * This field must be set to one of the SCU_TASK_CONTEXT_PROTOCOL values
      *    - SCU_TASK_CONTEXT_PROTOCOL_SMP
      *    - SCU_TASK_CONTEXT_PROTOCOL_SSP
      *    - SCU_TASK_CONTEXT_PROTOCOL_STP
      *    - SCU_TASK_CONTEXT_PROTOCOL_NONE
      */
     u32 protocol_type:3;
 
     /**
      * This filed must be set to the TCi allocated for this task
      */
     u32 task_index:12;
 
     /**
      * This field is reserved and must be set to 0x00
      */
     u32 reserved_00_0:1;
 
     /**
      * For a normal task request this must be set to 0.  If this is an abort of
      * this task request it must be set to 1.
      */
     u32 abort:1;
 
     /**
      * This field must be set to true for the SCU hardware to process the task.
      */
     u32 valid:1;
 
     /**
      * This field must be set to SCU_TASK_CONTEXT_TYPE
      */
     u32 context_type:1;
 
     /* OFFSET 0x04 */
     /**
      * This field contains the RNi that is the target of this request.
      */
     u32 remote_node_index:12;
 
     /**
      * This field is programmed if this is a mirrored request, which we are not
      * using, in which case it is the RNi for the mirrored target.
      */
     u32 mirrored_node_index:12;
 
     /**
      * This field is programmed with the direction of the SATA reqeust
      *    - SCU_SATA_WRITE_DATA_DIRECTION
      *    - SCU_SATA_READ_DATA_DIRECTION
      */
     u32 sata_direction:1;
 
     /**
      * This field is programmsed with one of the following SCU_COMMAND_CODE
      *    - SCU_COMMAND_CODE_INITIATOR_NEW_TASK
      *    - SCU_COMMAND_CODE_ACTIVE_TASK
      *    - SCU_COMMAND_CODE_PRIMITIVE_SEQ_TASK
      *    - SCU_COMMAND_CODE_TARGET_RAW_FRAMES
      */
     u32 command_code:2;
 
     /**
      * This field is set to true if the remote node should be suspended.
      * This bit is only valid for SSP & SMP target devices.
      */
     u32 suspend_node:1;
 
     /**
      * This field is programmed with one of the following command type codes
      *
      * For SAS requests use the scu_ssp_task_type
      *    - SCU_TASK_TYPE_IOREAD
      *    - SCU_TASK_TYPE_IOWRITE
      *    - SCU_TASK_TYPE_SMP_REQUEST
      *    - SCU_TASK_TYPE_RESPONSE
      *    - SCU_TASK_TYPE_RAW_FRAME
      *    - SCU_TASK_TYPE_PRIMITIVE
      *
      * For SATA requests use the scu_sata_task_type
      *    - SCU_TASK_TYPE_DMA_IN
      *    - SCU_TASK_TYPE_FPDMAQ_READ
      *    - SCU_TASK_TYPE_PACKET_DMA_IN
      *    - SCU_TASK_TYPE_SATA_RAW_FRAME
      *    - SCU_TASK_TYPE_DMA_OUT
      *    - SCU_TASK_TYPE_FPDMAQ_WRITE
      *    - SCU_TASK_TYPE_PACKET_DMA_OUT
      */
     u32 task_type:4;
 
     /* OFFSET 0x08 */
     /**
      * This field is reserved and the must be set to 0x00
      */
     u32 link_layer_control:8; /* presently all reserved */
 
     /**
      * This field is set to true when TLR is to be enabled
      */
     u32 ssp_tlr_enable:1;
 
     /**
      * This is field specifies if the SCU DMAs a response frame to host
      * memory for good response frames when operating in target mode.
      */
     u32 dma_ssp_target_good_response:1;
 
     /**
      * This field indicates if the SCU should DMA the response frame to
      * host memory.
      */
     u32 do_not_dma_ssp_good_response:1;
 
     /**
      * This field is set to true when strict ordering is to be enabled
      */
     u32 strict_ordering:1;
 
     /**
      * This field indicates the type of endianess to be utilized for the
      * frame.  command, task, and response frames utilized control_frame
      * set to 1.
      */
     u32 control_frame:1;
 
     /**
      * This field is reserved and the driver should set to 0x00
      */
     u32 tl_control_reserved:3;
 
     /**
      * This field is set to true when the SCU hardware task timeout control is to
      * be enabled
      */
     u32 timeout_enable:1;
 
     /**
      * This field is reserved and the driver should set it to 0x00
      */
     u32 pts_control_reserved:7;
 
     /**
      * This field should be set to true when block guard is to be enabled
      */
     u32 block_guard_enable:1;
 
     /**
      * This field is reserved and the driver should set to 0x00
      */
     u32 sdma_control_reserved:7;
 
     /* OFFSET 0x0C */
     /**
      * This field is the address modifier for this io request it should be
      * programmed with the virtual function that is making the request.
      */
     u32 address_modifier:16;
 
     /**
      * @todo What we support mirrored SMP response frame?
      */
     u32 mirrored_protocol_engine:3;  /* mirrored protocol Engine Index */
 
     /**
      * If this is a mirrored request the logical port index for the mirrored RNi
      * must be programmed.
      */
     u32 mirrored_logical_port:4;  /* mirrored local port index */
 
     /**
      * This field is reserved and the driver must set it to 0x00
      */
     u32 reserved_0C_0:8;
 
     /**
      * This field must be set to true if the mirrored request processing is to be
      * enabled.
      */
     u32 mirror_request_enable:1;  /* Mirrored request Enable */
 
     /* OFFSET 0x10 */
     /**
      * This field is the command iu length in dwords
      */
     u32 ssp_command_iu_length:8;
 
     /**
      * This is the target TLR enable bit it must be set to 0 when creatning the
      * task context.
      */
     u32 xfer_ready_tlr_enable:1;
 
     /**
      * This field is reserved and the driver must set it to 0x00
      */
     u32 reserved_10_0:7;
 
     /**
      * This is the maximum burst size that the SCU hardware will send in one
      * connection its value is (N x 512) and N must be a multiple of 2.  If the
      * value is 0x00 then maximum burst size is disabled.
      */
     u32 ssp_max_burst_size:16;
 
     /* OFFSET 0x14 */
     /**
      * This filed is set to the number of bytes to be transfered in the request.
      */
     u32 transfer_length_bytes:24; /* In terms of bytes */
 
     /**
      * This field is reserved and the driver should set it to 0x00
      */
     u32 reserved_14_0:8;
 
     /* OFFSET 0x18-0x2C */
     /**
      * This union provides for the protocol specif part of the SCU Task Context.
      */
     union protocol_context type;
 
     /* OFFSET 0x30-0x34 */
     /**
      * This field is the upper 32 bits of the 64 bit physical address of the
      * command iu buffer
      */
     u32 command_iu_upper;
 
     /**
      * This field is the lower 32 bits of the 64 bit physical address of the
      * command iu buffer
      */
     u32 command_iu_lower;
 
     /* OFFSET 0x38-0x3C */
     /**
      * This field is the upper 32 bits of the 64 bit physical address of the
      * response iu buffer
      */
     u32 response_iu_upper;
 
     /**
      * This field is the lower 32 bits of the 64 bit physical address of the
      * response iu buffer
      */
     u32 response_iu_lower;
 
     /* OFFSET 0x40 */
     /**
      * This field is set to the task phase of the SCU hardware. The driver must
      * set this to 0x01
      */
     u32 task_phase:8;
 
     /**
      * This field is set to the transport layer task status.  The driver must set
      * this to 0x00
      */
     u32 task_status:8;
 
     /**
      * This field is used during initiator write TLR
      */
     u32 previous_extended_tag:4;
 
     /**
      * This field is set the maximum number of retries for a STP non-data FIS
      */
     u32 stp_retry_count:2;
 
     /**
      * This field is reserved and the driver must set it to 0x00
      */
     u32 reserved_40_1:2;
 
     /**
      * This field is used by the SCU TL to determine when to take a snapshot when
      * tranmitting read data frames.
      *    - 0x00 The entire IO
      *    - 0x01 32k
      *    - 0x02 64k
      *    - 0x04 128k
      *    - 0x08 256k
      */
     u32 ssp_tlr_threshold:4;
 
     /**
      * This field is reserved and the driver must set it to 0x00
      */
     u32 reserved_40_2:4;
 
     /* OFFSET 0x44 */
     u32 write_data_length; /* read only set to 0 */
 
     /* OFFSET 0x48-0x58 */
     struct transport_snapshot snapshot; /* read only set to 0 */
 
     /* OFFSET 0x5C */
     u32 blk_prot_en:1;
     u32 blk_sz:2;
     u32 blk_prot_func:2;
     u32 reserved_5C_0:9;
     u32 active_sgl_element:2;  /* read only set to 0 */
     u32 sgl_exhausted:1;  /* read only set to 0 */
     u32 payload_data_transfer_error:4;  /* read only set to 0 */
     u32 frame_buffer_offset:11; /* read only set to 0 */
 
     /* OFFSET 0x60-0x7C */
     /**
      * This field is the first SGL element pair found in the TC data structure.
      */
     struct scu_sgl_element_pair sgl_pair_ab;
     /* OFFSET 0x80-0x9C */
     /**
      * This field is the second SGL element pair found in the TC data structure.
      */
     struct scu_sgl_element_pair sgl_pair_cd;
 
     /* OFFSET 0xA0-BC */
     struct scu_sgl_element_pair sgl_snapshot_ac;
 
     /* OFFSET 0xC0 */
     u32 active_sgl_element_pair; /* read only set to 0 */
 
     /* OFFSET 0xC4-0xCC */
     u32 reserved_C4_CC[3];
 
     /* OFFSET 0xD0 */
     u32 interm_crc_val:16;
     u32 init_crc_seed:16;
 
     /* OFFSET 0xD4 */
     u32 app_tag_verify:16;
     u32 app_tag_gen:16;
 
     /* OFFSET 0xD8 */
     u32 ref_tag_seed_verify;
 
     /* OFFSET 0xDC */
     u32 UD_bytes_immed_val:13;
     u32 reserved_DC_0:3;
     u32 DIF_bytes_immed_val:4;
     u32 reserved_DC_1:12;
 
     /* OFFSET 0xE0 */
     u32 bgc_blk_sz:13;
     u32 reserved_E0_0:3;
     u32 app_tag_gen_mask:16;
 
     /* OFFSET 0xE4 */
     union {
         u16 bgctl;
         struct {
             u16 crc_verify:1;
             u16 app_tag_chk:1;
             u16 ref_tag_chk:1;
             u16 op:2;
             u16 legacy:1;
             u16 invert_crc_seed:1;
             u16 ref_tag_gen:1;
             u16 fixed_ref_tag:1;
             u16 invert_crc:1;
             u16 app_ref_f_detect:1;
             u16 uninit_dif_check_err:1;
             u16 uninit_dif_bypass:1;
             u16 app_f_detect:1;
             u16 reserved_0:2;
         } bgctl_f;
     };
 
     u16 app_tag_verify_mask;
 
     /* OFFSET 0xE8 */
     u32 blk_guard_err:8;
     u32 reserved_E8_0:24;
 
     /* OFFSET 0xEC */
     u32 ref_tag_seed_gen;
 
     /* OFFSET 0xF0 */
     u32 intermediate_crc_valid_snapshot:16;
     u32 reserved_F0_0:16;
 
     /* OFFSET 0xF4 */
     u32 reference_tag_seed_for_verify_function_snapshot;
 
     /* OFFSET 0xF8 */
     u32 snapshot_of_reserved_dword_DC_of_tc;
 
     /* OFFSET 0xFC */
     u32 reference_tag_seed_for_generate_function_snapshot;
 
 } __packed;
 
 #endif /* _SCU_TASK_CONTEXT_H_ */

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