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/drivers/scsi/isci/unsolicited_frame_control.h

http://github.com/mirrors/linux
C Header | 282 lines | 58 code | 40 blank | 184 comment | 0 complexity | 09ce481688480bb3cb712ab6301c12a9 MD5 | raw file
  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.
 28 *
 29 * Redistribution and use in source and binary forms, with or without
 30 * modification, are permitted provided that the following conditions
 31 * are met:
 32 *
 33 *   * Redistributions of source code must retain the above copyright
 34 *     notice, this list of conditions and the following disclaimer.
 35 *   * Redistributions in binary form must reproduce the above copyright
 36 *     notice, this list of conditions and the following disclaimer in
 37 *     the documentation and/or other materials provided with the
 38 *     distribution.
 39 *   * Neither the name of Intel Corporation nor the names of its
 40 *     contributors may be used to endorse or promote products derived
 41 *     from this software without specific prior written permission.
 42 *
 43 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 44 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 45 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 46 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 47 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 48 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 49 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 50 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 51 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 52 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 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 */
 70struct 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 */
112enum 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 */
143struct 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 */
166struct 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 */
188struct 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 */
211struct 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 */
232struct 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#define SCI_UFI_BUF_SIZE (SCU_MAX_UNSOLICITED_FRAMES * SCU_UNSOLICITED_FRAME_BUFFER_SIZE)
261#define SCI_UFI_HDR_SIZE (SCU_MAX_UNSOLICITED_FRAMES * sizeof(struct scu_unsolicited_frame_header))
262#define SCI_UFI_TOTAL_SIZE (SCI_UFI_BUF_SIZE + SCI_UFI_HDR_SIZE + SCU_MAX_UNSOLICITED_FRAMES * sizeof(u64))
263
264struct isci_host;
265
266void sci_unsolicited_frame_control_construct(struct isci_host *ihost);
267
268enum sci_status sci_unsolicited_frame_control_get_header(
269	struct sci_unsolicited_frame_control *uf_control,
270	u32 frame_index,
271	void **frame_header);
272
273enum sci_status sci_unsolicited_frame_control_get_buffer(
274	struct sci_unsolicited_frame_control *uf_control,
275	u32 frame_index,
276	void **frame_buffer);
277
278bool sci_unsolicited_frame_control_release_frame(
279	struct sci_unsolicited_frame_control *uf_control,
280	u32 frame_index);
281
282#endif /* _SCIC_SDS_UNSOLICITED_FRAME_CONTROL_H_ */