| 1 | // ========== Copyright Header Begin ========================================== |
| 2 | // |
| 3 | // OpenSPARC T2 Processor File: niu_dmc_dmaarb.v |
| 4 | // Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved |
| 5 | // 4150 Network Circle, Santa Clara, California 95054, U.S.A. |
| 6 | // |
| 7 | // * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 8 | // |
| 9 | // This program is free software; you can redistribute it and/or modify |
| 10 | // it under the terms of the GNU General Public License as published by |
| 11 | // the Free Software Foundation; version 2 of the License. |
| 12 | // |
| 13 | // This program is distributed in the hope that it will be useful, |
| 14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | // GNU 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 21 | // |
| 22 | // For the avoidance of doubt, and except that if any non-GPL license |
| 23 | // choice is available it will apply instead, Sun elects to use only |
| 24 | // the General Public License version 2 (GPLv2) at this time for any |
| 25 | // software where a choice of GPL license versions is made |
| 26 | // available with the language indicating that GPLv2 or any later version |
| 27 | // may be used, or where a choice of which version of the GPL is applied is |
| 28 | // otherwise unspecified. |
| 29 | // |
| 30 | // Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 31 | // CA 95054 USA or visit www.sun.com if you need additional information or |
| 32 | // have any questions. |
| 33 | // |
| 34 | // ========== Copyright Header End ============================================ |
| 35 | /********************************************************************* |
| 36 | * |
| 37 | **********************************************************************/ |
| 38 | |
| 39 | |
| 40 | `include "txc_defines.h" |
| 41 | `include "niu_dmc_reg_defines.h" |
| 42 | |
| 43 | module niu_dmc_dmaarb (/*AUTOARG*/ |
| 44 | // Outputs |
| 45 | ArbDone, DMANum, DMAsGranted, |
| 46 | // Inputs |
| 47 | SysClk, Reset_L, Choose_DMAs, DMA_Reqs |
| 48 | ); |
| 49 | |
| 50 | |
| 51 | input SysClk; |
| 52 | input Reset_L; |
| 53 | input Choose_DMAs; |
| 54 | input [31:0] DMA_Reqs; |
| 55 | |
| 56 | output ArbDone; |
| 57 | output [4:0] DMANum; |
| 58 | output [31:0] DMAsGranted; |
| 59 | |
| 60 | |
| 61 | |
| 62 | reg [31:0] DMAsGranted; |
| 63 | reg [31:0] Select_DMA_Grant; |
| 64 | reg [3:0] DMA_Request_ArbState; |
| 65 | reg ArbDone; |
| 66 | reg [4:0] DMANum; |
| 67 | |
| 68 | |
| 69 | |
| 70 | parameter DMA_REQ_ARB_IDLE = 4'h0, |
| 71 | SELECT_DMA_NUM = 4'h1, |
| 72 | DMA_REQ_ARB_DONE = 4'h2; |
| 73 | |
| 74 | //VCS coverage off |
| 75 | // synopsys translate_off |
| 76 | reg [192:1] CACHE_REQ_ARB_STATE; |
| 77 | |
| 78 | always @(DMA_Request_ArbState) |
| 79 | begin |
| 80 | case(DMA_Request_ArbState) |
| 81 | DMA_REQ_ARB_IDLE : CACHE_REQ_ARB_STATE = "DMA_REQ_ARB_IDLE"; |
| 82 | SELECT_DMA_NUM: CACHE_REQ_ARB_STATE = "SELECT_DMA_NUM"; |
| 83 | DMA_REQ_ARB_DONE : CACHE_REQ_ARB_STATE = "DMA_REQ_ARB_DONE"; |
| 84 | default : CACHE_REQ_ARB_STATE = "UNKNOWN"; |
| 85 | endcase |
| 86 | end |
| 87 | // synopsys translate_on |
| 88 | //VCS coverage on |
| 89 | |
| 90 | |
| 91 | always@(posedge SysClk ) begin |
| 92 | if(!Reset_L)begin |
| 93 | DMA_Request_ArbState <= DMA_REQ_ARB_IDLE; |
| 94 | DMAsGranted <= 32'h0; |
| 95 | Select_DMA_Grant <= 32'h0; |
| 96 | ArbDone <= 1'b1; |
| 97 | DMANum<= 5'h0; |
| 98 | end else |
| 99 | begin |
| 100 | case(DMA_Request_ArbState) // synopsys parallel_case |
| 101 | DMA_REQ_ARB_IDLE: begin |
| 102 | ArbDone <=1'b0; |
| 103 | if(Choose_DMAs) begin |
| 104 | Select_DMA_Grant <= DMA_Reqs & ~DMAsGranted; |
| 105 | DMA_Request_ArbState <= SELECT_DMA_NUM; |
| 106 | end else begin // if (choose_available_dmas) |
| 107 | DMAsGranted <= 32'h0; |
| 108 | Select_DMA_Grant <= 32'h0; |
| 109 | end // else: !if(choose_available_dmas) |
| 110 | end // case: DMA_REQ_ARB_IDLE |
| 111 | SELECT_DMA_NUM: begin |
| 112 | ArbDone <=1'b1; |
| 113 | casex(Select_DMA_Grant) // Synopsys full_case |
| 114 | 32'b0000_0000_0000_0000_0000_0000_0000_0001: begin |
| 115 | DMAsGranted <= 32'b0000_0000_0000_0000_0000_0000_0000_0001; |
| 116 | DMANum<= `DMA_CHANNEL_ZERO; |
| 117 | end // case: 32'b0000_0000_0000_0000_0000_0000_0000_0001 |
| 118 | 32'b????_????_????_????_????_????_????_??1?: begin |
| 119 | DMAsGranted <= 32'b0000_0000_0000_0000_0000_0000_0000_0010; |
| 120 | DMANum<= `DMA_CHANNEL_ONE; |
| 121 | end |
| 122 | 32'b????_????_????_????_????_????_????_?10?: begin |
| 123 | DMAsGranted <= 32'b0000_0000_0000_0000_0000_0000_0000_0100; |
| 124 | DMANum<= `DMA_CHANNEL_TWO; |
| 125 | end |
| 126 | 32'b????_????_????_????_????_????_????_100?: begin |
| 127 | DMAsGranted <= 32'b0000_0000_0000_0000_0000_0000_0000_1000; |
| 128 | DMANum<= `DMA_CHANNEL_THREE; |
| 129 | end |
| 130 | 32'b????_????_????_????_????_????_???1_000?: begin |
| 131 | DMAsGranted <= 32'b0000_0000_0000_0000_0000_0000_0001_0000; |
| 132 | DMANum<= `DMA_CHANNEL_FOUR; |
| 133 | end |
| 134 | 32'b????_????_????_????_????_????_??10_000?: begin |
| 135 | DMAsGranted <= 32'b0000_0000_0000_0000_0000_0000_0010_0000; |
| 136 | DMANum<= `DMA_CHANNEL_FIVE; |
| 137 | end |
| 138 | 32'b????_????_????_????_????_????_?100_000?: begin |
| 139 | DMAsGranted <= 32'b0000_0000_0000_0000_0000_0000_0100_0000; |
| 140 | DMANum<= `DMA_CHANNEL_SIX; |
| 141 | |
| 142 | end |
| 143 | 32'b????_????_????_????_????_????_1000_000?: begin |
| 144 | DMAsGranted <= 32'b0000_0000_0000_0000_0000_0000_1000_0000; |
| 145 | DMANum<= `DMA_CHANNEL_SEVEN; |
| 146 | end |
| 147 | 32'b????_????_????_????_????_???1_0000_000?: begin |
| 148 | DMAsGranted <= 32'b0000_0000_0000_0000_0000_0001_0000_0000; |
| 149 | DMANum<= `DMA_CHANNEL_EIGHT; |
| 150 | end |
| 151 | 32'b????_????_????_????_????_??10_0000_000?: begin |
| 152 | DMAsGranted <= 32'b0000_0000_0000_0000_0000_0010_0000_0000; |
| 153 | DMANum<= `DMA_CHANNEL_NINE; |
| 154 | end |
| 155 | 32'b????_????_????_????_????_?100_0000_000?: begin |
| 156 | DMAsGranted <= 32'b0000_0000_0000_0000_0000_0100_0000_0000; |
| 157 | DMANum<= `DMA_CHANNEL_TEN; |
| 158 | end |
| 159 | 32'b????_????_????_????_????_1000_0000_000?: begin |
| 160 | DMAsGranted <= 32'b0000_0000_0000_0000_0000_1000_0000_0000; |
| 161 | DMANum<= `DMA_CHANNEL_ELEVEN; |
| 162 | end |
| 163 | 32'b????_????_????_????_???1_0000_0000_000?: begin |
| 164 | DMAsGranted <= 32'b0000_0000_0000_0000_0001_0000_0000_0000; |
| 165 | DMANum<= `DMA_CHANNEL_TWELVE; |
| 166 | end |
| 167 | 32'b????_????_????_????_??10_0000_0000_000?: begin |
| 168 | DMAsGranted <= 32'b0000_0000_0000_0000_0010_0000_0000_0000; |
| 169 | DMANum<= `DMA_CHANNEL_THIRTEEN; |
| 170 | end |
| 171 | 32'b????_????_????_????_?100_0000_0000_000?: begin |
| 172 | DMAsGranted <= 32'b0000_0000_0000_0000_0100_0000_0000_0000; |
| 173 | DMANum<= `DMA_CHANNEL_FOURTEEN; |
| 174 | end |
| 175 | 32'b????_????_????_????_1000_0000_0000_000?: begin |
| 176 | DMAsGranted <= 32'b0000_0000_0000_0000_1000_0000_0000_0000; |
| 177 | DMANum<= `DMA_CHANNEL_FIFTEEN; |
| 178 | end |
| 179 | 32'b????_????_????_???1_0000_0000_0000_000?: begin |
| 180 | DMAsGranted <= 32'b0000_0000_0000_0001_0000_0000_0000_0000; |
| 181 | DMANum<= `DMA_CHANNEL_SIXTEEN; |
| 182 | end |
| 183 | 32'b????_????_????_??10_0000_0000_0000_000?: begin |
| 184 | DMAsGranted <= 32'b0000_0000_0000_0010_0000_0000_0000_0000; |
| 185 | DMANum<= `DMA_CHANNEL_SEVENTEEN; |
| 186 | end |
| 187 | 32'b????_????_????_?100_0000_0000_0000_000?: begin |
| 188 | DMAsGranted <= 32'b0000_0000_0000_0100_0000_0000_0000_0000; |
| 189 | DMANum<= `DMA_CHANNEL_EIGHTEEN; |
| 190 | end |
| 191 | 32'b????_????_????_1000_0000_0000_0000_000?: begin |
| 192 | DMAsGranted <= 32'b0000_0000_0000_1000_0000_0000_0000_0000; |
| 193 | DMANum<= `DMA_CHANNEL_NINETEEN; |
| 194 | end |
| 195 | 32'b????_????_???1_0000_0000_0000_0000_000?: begin |
| 196 | DMAsGranted <= 32'b0000_0000_0001_0000_0000_0000_0000_0000; |
| 197 | DMANum<= `DMA_CHANNEL_TWENTY; |
| 198 | end |
| 199 | 32'b????_????_??10_0000_0000_0000_0000_000?: begin |
| 200 | DMAsGranted <= 32'b0000_0000_0010_0000_0000_0000_0000_0000; |
| 201 | DMANum<= `DMA_CHANNEL_TWENTYONE; |
| 202 | end |
| 203 | 32'b????_????_?100_0000_0000_0000_0000_000?: begin |
| 204 | DMAsGranted <= 32'b0000_0000_0100_0000_0000_0000_0000_0000; |
| 205 | DMANum<= `DMA_CHANNEL_TWENTYTWO; |
| 206 | end |
| 207 | 32'b????_????_1000_0000_0000_0000_0000_000?: begin |
| 208 | DMAsGranted <= 32'b0000_0000_1000_0000_0000_0000_0000_0000; |
| 209 | DMANum<= `DMA_CHANNEL_TWENTYTHREE; |
| 210 | end |
| 211 | default: begin |
| 212 | DMAsGranted <= 32'b0; |
| 213 | DMANum<=`DMA_CHANNEL_ZERO; |
| 214 | end |
| 215 | |
| 216 | endcase // case(DMA_Request_ArbState) |
| 217 | DMA_Request_ArbState <= DMA_REQ_ARB_DONE; |
| 218 | end // case: SELECT_DMA_NUM |
| 219 | DMA_REQ_ARB_DONE: begin |
| 220 | DMA_Request_ArbState <= DMA_REQ_ARB_IDLE; |
| 221 | ArbDone <=1'b0; |
| 222 | end // case: DMA_REQ_ARB_DONE |
| 223 | endcase // case(DMA_Request_ArbState) |
| 224 | end // else: !if(!Reset_L) |
| 225 | end // always@ (posedge SysClk ) |
| 226 | endmodule // niu_dmc_dmaarb |
| 227 | |