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 remote 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_ */ 189