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_REMOTE_NODE_TABLE_H_
57 #define _SCIC_SDS_REMOTE_NODE_TABLE_H_
58
59 #include "isci.h"
60
61 /**
62 *
63 *
64 * Remote node sets are sets of remote node index in the remtoe node table The
65 * SCU hardware requires that STP remote node entries take three consecutive
66 * remote node index so the table is arranged in sets of three. The bits are
67 * used as 0111 0111 to make a byte and the bits define the set of three remote
68 * nodes to use as a sequence.
69 */
70 #define SCIC_SDS_REMOTE_NODE_SETS_PER_BYTE 2
71
72 /**
73 *
74 *
75 * Since the remote node table is organized as DWORDS take the remote node sets
76 * in bytes and represent them in DWORDs. The lowest ordered bits are the ones
77 * used in case full DWORD is not being used. i.e. 0000 0000 0000 0000 0111
78 * 0111 0111 0111 // if only a single WORD is in use in the DWORD.
79 */
80 #define SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD \
81 (sizeof(u32) * SCIC_SDS_REMOTE_NODE_SETS_PER_BYTE)
82 /**
83 *
84 *
85 * This is a count of the numeber of remote nodes that can be represented in a
86 * byte
87 */
88 #define SCIC_SDS_REMOTE_NODES_PER_BYTE \
89 (SCU_STP_REMOTE_NODE_COUNT * SCIC_SDS_REMOTE_NODE_SETS_PER_BYTE)
90
91 /**
92 *
93 *
94 * This is a count of the number of remote nodes that can be represented in a
95 * DWROD
96 */
97 #define SCIC_SDS_REMOTE_NODES_PER_DWORD \
98 (sizeof(u32) * SCIC_SDS_REMOTE_NODES_PER_BYTE)
99
100 /**
101 *
102 *
103 * This is the number of bits in a remote node group
104 */
105 #define SCIC_SDS_REMOTE_NODES_BITS_PER_GROUP 4
106
107 #define SCIC_SDS_REMOTE_NODE_TABLE_INVALID_INDEX (0xFFFFFFFF)
108 #define SCIC_SDS_REMOTE_NODE_TABLE_FULL_SLOT_VALUE (0x07)
109 #define SCIC_SDS_REMOTE_NODE_TABLE_EMPTY_SLOT_VALUE (0x00)
110
111 /**
112 *
113 *
114 * Expander attached sata remote node count
115 */
116 #define SCU_STP_REMOTE_NODE_COUNT 3
117
118 /**
119 *
120 *
121 * Expander or direct attached ssp remote node count
122 */
123 #define SCU_SSP_REMOTE_NODE_COUNT 1
124
125 /**
126 *
127 *
128 * Direct attached STP remote node count
129 */
130 #define SCU_SATA_REMOTE_NODE_COUNT 1
131
132 /**
133 * struct sci_remote_node_table -
134 *
135 *
136 */
137 struct sci_remote_node_table {
138 /**
139 * This field contains the array size in dwords
140 */
141 u16 available_nodes_array_size;
142
143 /**
144 * This field contains the array size of the
145 */
146 u16 group_array_size;
147
148 /**
149 * This field is the array of available remote node entries in bits.
150 * Because of the way STP remote node data is allocated on the SCU hardware
151 * the remote nodes must occupy three consecutive remote node context
152 * entries. For ease of allocation and de-allocation we have broken the
153 * sets of three into a single nibble. When the STP RNi is allocated all
154 * of the bits in the nibble are cleared. This math results in a table size
155 * of MAX_REMOTE_NODES / CONSECUTIVE RNi ENTRIES for STP / 2 entries per byte.
156 */
157 u32 available_remote_nodes[
158 (SCI_MAX_REMOTE_DEVICES / SCIC_SDS_REMOTE_NODES_PER_DWORD)
159 + ((SCI_MAX_REMOTE_DEVICES % SCIC_SDS_REMOTE_NODES_PER_DWORD) != 0)];
160
161 /**
162 * This field is the nibble selector for the above table. There are three
163 * possible selectors each for fast lookup when trying to find one, two or
164 * three remote node entries.
165 */
166 u32 remote_node_groups[
167 SCU_STP_REMOTE_NODE_COUNT][
168 (SCI_MAX_REMOTE_DEVICES / (32 * SCU_STP_REMOTE_NODE_COUNT))
169 + ((SCI_MAX_REMOTE_DEVICES % (32 * SCU_STP_REMOTE_NODE_COUNT)) != 0)];
170
171 };
172
173 /* --------------------------------------------------------------------------- */
174
175 void sci_remote_node_table_initialize(
176 struct sci_remote_node_table *remote_node_table,
177 u32 remote_node_entries);
178
179 u16 sci_remote_node_table_allocate_remote_node(
180 struct sci_remote_node_table *remote_node_table,
181 u32 remote_node_count);
182
183 void sci_remote_node_table_release_remote_node_index(
184 struct sci_remote_node_table *remote_node_table,
185 u32 remote_node_count,
186 u16 remote_node_index);
187
188 #endif /* _SCIC_SDS_REMOTE_NODE_TABLE_H_ */