1 files changed, 942 insertions, 0 deletions

diff --git a/drivers/scsi/isci/scu_task_context.h b/drivers/scsi/isci/scu_task_context.h
new file mode 100644
index 000000000000..7df87d923285
--- /dev/null
+++ b/drivers/scsi/isci/scu_task_context.h
@@ -0,0 +1,942 @@
+/*
+ * 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.
+ *   * Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in
+ *     the documentation and/or other materials provided with the
+ *     distribution.
+ *   * Neither the name of Intel Corporation nor the names of its
+ *     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,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (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 block_protection_enable:1;
+        u32 block_size:2;
+        u32 block_protection_function: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 intermediate_crc_value:16;
+        u32 initial_crc_seed:16;
+
+        /* OFFSET 0xD4 */
+        u32 application_tag_for_verify:16;
+        u32 application_tag_for_generate:16;
+
+        /* OFFSET 0xD8 */
+        u32 reference_tag_seed_for_verify_function;
+
+        /* OFFSET 0xDC */
+        u32 reserved_DC;
+
+        /* OFFSET 0xE0 */
+        u32 reserved_E0_0:16;
+        u32 application_tag_mask_for_generate:16;
+
+        /* OFFSET 0xE4 */
+        u32 block_protection_control:16;
+        u32 application_tag_mask_for_verify:16;
+
+        /* OFFSET 0xE8 */
+        u32 block_protection_error:8;
+        u32 reserved_E8_0:24;
+
+        /* OFFSET 0xEC */
+        u32 reference_tag_seed_for_verify;
+
+        /* 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;
+
+};
+
+#endif /* _SCU_TASK_CONTEXT_H_ */