drivers/scsi/isci/unsolicited_frame_control.h

   1 /*
   2  * This file is provided under a dual BSD/GPLv2 license.  When using or
   3  * redistributing this file, you may do so under either license.
   4  *
   5  * GPL LICENSE SUMMARY
   6  *
   7  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of version 2 of the GNU General Public License as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  21  * The full GNU General Public License is included in this distribution
  22  * in the file called LICENSE.GPL.
  23  *
  24  * BSD LICENSE
  25  *
  26  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
  27  * All rights reserved.
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  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
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  33  *   * Redistributions of source code must retain the above copyright
  34  *     notice, this list of conditions and the following disclaimer.
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  41  *     from this software without specific prior written permission.
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  43  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  44  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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  53  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  54  */
  55
  56 #ifndef _SCIC_SDS_UNSOLICITED_FRAME_CONTROL_H_
  57 #define _SCIC_SDS_UNSOLICITED_FRAME_CONTROL_H_
  58
  59 #include "isci.h"
  60
  61 #define SCU_UNSOLICITED_FRAME_HEADER_DATA_DWORDS 15
  62
  63 /**
  64  * struct scu_unsolicited_frame_header -
  65  *
  66  * This structure delineates the format of an unsolicited frame header. The
  67  * first DWORD are UF attributes defined by the silicon architecture. The data
  68  * depicts actual header information received on the link.
  69  */
  70 struct scu_unsolicited_frame_header {
  71         /**
  72          * This field indicates if there is an Initiator Index Table entry with
  73          * which this header is associated.
  74          */
  75         u32 iit_exists:1;
  76
  77         /**
  78          * This field simply indicates the protocol type (i.e. SSP, STP, SMP).
  79          */
  80         u32 protocol_type:3;
  81
  82         /**
  83          * This field indicates if the frame is an address frame (IAF or OAF)
  84          * or if it is a information unit frame.
  85          */
  86         u32 is_address_frame:1;
  87
  88         /**
  89          * This field simply indicates the connection rate at which the frame
  90          * was received.
  91          */
  92         u32 connection_rate:4;
  93
  94         u32 reserved:23;
  95
  96         /**
  97          * This field represents the actual header data received on the link.
  98          */
  99         u32 data[SCU_UNSOLICITED_FRAME_HEADER_DATA_DWORDS];
 100
 101 };
 102
 103
 104
 105 /**
 106  * enum unsolicited_frame_state -
 107  *
 108  * This enumeration represents the current unsolicited frame state.  The
 109  * controller object can not updtate the hardware unsolicited frame put pointer
 110  * unless it has already processed the priror unsolicited frames.
 111  */
 112 enum unsolicited_frame_state {
 113         /**
 114          * This state is when the frame is empty and not in use.  It is
 115          * different from the released state in that the hardware could DMA
 116          * data to this frame buffer.
 117          */
 118         UNSOLICITED_FRAME_EMPTY,
 119
 120         /**
 121          * This state is set when the frame buffer is in use by by some
 122          * object in the system.
 123          */
 124         UNSOLICITED_FRAME_IN_USE,
 125
 126         /**
 127          * This state is set when the frame is returned to the free pool
 128          * but one or more frames prior to this one are still in use.
 129          * Once all of the frame before this one are freed it will go to
 130          * the empty state.
 131          */
 132         UNSOLICITED_FRAME_RELEASED,
 133
 134         UNSOLICITED_FRAME_MAX_STATES
 135 };
 136
 137 /**
 138  * struct sci_unsolicited_frame -
 139  *
 140  * This is the unsolicited frame data structure it acts as the container for
 141  * the current frame state, frame header and frame buffer.
 142  */
 143 struct sci_unsolicited_frame {
 144         /**
 145          * This field contains the current frame state
 146          */
 147         enum unsolicited_frame_state state;
 148
 149         /**
 150          * This field points to the frame header data.
 151          */
 152         struct scu_unsolicited_frame_header *header;
 153
 154         /**
 155          * This field points to the frame buffer data.
 156          */
 157         void *buffer;
 158
 159 };
 160
 161 /**
 162  * struct sci_uf_header_array -
 163  *
 164  * This structure contains all of the unsolicited frame header information.
 165  */
 166 struct sci_uf_header_array {
 167         /**
 168          * This field is represents a virtual pointer to the start
 169          * address of the UF address table.  The table contains
 170          * 64-bit pointers as required by the hardware.
 171          */
 172         struct scu_unsolicited_frame_header *array;
 173
 174         /**
 175          * This field specifies the physical address location for the UF
 176          * buffer array.
 177          */
 178         dma_addr_t physical_address;
 179
 180 };
 181
 182 /**
 183  * struct sci_uf_buffer_array -
 184  *
 185  * This structure contains all of the unsolicited frame buffer (actual payload)
 186  * information.
 187  */
 188 struct sci_uf_buffer_array {
 189         /**
 190          * This field is the unsolicited frame data its used to manage
 191          * the data for the unsolicited frame requests.  It also represents
 192          * the virtual address location that corresponds to the
 193          * physical_address field.
 194          */
 195         struct sci_unsolicited_frame array[SCU_MAX_UNSOLICITED_FRAMES];
 196
 197         /**
 198          * This field specifies the physical address location for the UF
 199          * buffer array.
 200          */
 201         dma_addr_t physical_address;
 202 };
 203
 204 /**
 205  * struct sci_uf_address_table_array -
 206  *
 207  * This object maintains all of the unsolicited frame address table specific
 208  * data.  The address table is a collection of 64-bit pointers that point to
 209  * 1KB buffers into which the silicon will DMA unsolicited frames.
 210  */
 211 struct sci_uf_address_table_array {
 212         /**
 213          * This field represents a virtual pointer that refers to the
 214          * starting address of the UF address table.
 215          * 64-bit pointers are required by the hardware.
 216          */
 217         u64 *array;
 218
 219         /**
 220          * This field specifies the physical address location for the UF
 221          * address table.
 222          */
 223         dma_addr_t physical_address;
 224
 225 };
 226
 227 /**
 228  * struct sci_unsolicited_frame_control -
 229  *
 230  * This object contains all of the data necessary to handle unsolicited frames.
 231  */
 232 struct sci_unsolicited_frame_control {
 233         /**
 234          * This field is the software copy of the unsolicited frame queue
 235          * get pointer.  The controller object writes this value to the
 236          * hardware to let the hardware put more unsolicited frame entries.
 237          */
 238         u32 get;
 239
 240         /**
 241          * This field contains all of the unsolicited frame header
 242          * specific fields.
 243          */
 244         struct sci_uf_header_array headers;
 245
 246         /**
 247          * This field contains all of the unsolicited frame buffer
 248          * specific fields.
 249          */
 250         struct sci_uf_buffer_array buffers;
 251
 252         /**
 253          * This field contains all of the unsolicited frame address table
 254          * specific fields.
 255          */
 256         struct sci_uf_address_table_array address_table;
 257
 258 };
 259
 260 struct isci_host;
 261
 262 int sci_unsolicited_frame_control_construct(struct isci_host *ihost);
 263
 264 enum sci_status sci_unsolicited_frame_control_get_header(
 265         struct sci_unsolicited_frame_control *uf_control,
 266         u32 frame_index,
 267         void **frame_header);
 268
 269 enum sci_status sci_unsolicited_frame_control_get_buffer(
 270         struct sci_unsolicited_frame_control *uf_control,
 271         u32 frame_index,
 272         void **frame_buffer);
 273
 274 bool sci_unsolicited_frame_control_release_frame(
 275         struct sci_unsolicited_frame_control *uf_control,
 276         u32 frame_index);
 277
 278 #endif /* _SCIC_SDS_UNSOLICITED_FRAME_CONTROL_H_ */