esiop.ss revision 1.11
1; $NetBSD: esiop.ss,v 1.11 2002/04/27 17:39:52 bouyer Exp $ 2 3; 4; Copyright (c) 2002 Manuel Bouyer. 5; 6; Redistribution and use in source and binary forms, with or without 7; modification, are permitted provided that the following conditions 8; are met: 9; 1. Redistributions of source code must retain the above copyright 10; notice, this list of conditions and the following disclaimer. 11; 2. Redistributions in binary form must reproduce the above copyright 12; notice, this list of conditions and the following disclaimer in the 13; documentation and/or other materials provided with the distribution. 14; 3. All advertising materials mentioning features or use of this software 15; must display the following acknowledgement: 16; This product includes software developed by Manuel Bouyer. 17; 4. Neither the name of the University nor the names of its contributors 18; may be used to endorse or promote products derived from this software 19; without specific prior written permission. 20; 21; THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22; ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24; ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25; FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27; OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28; HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29; LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30; OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31; SUCH DAMAGE. 32; 33 34ARCH 825 35 36; offsets in siop_common_xfer 37ABSOLUTE t_id = 40; 38ABSOLUTE t_msg_in = 48; 39ABSOLUTE t_ext_msg_in = 56; 40ABSOLUTE t_ext_msg_data = 64; 41ABSOLUTE t_msg_out = 72; 42ABSOLUTE t_cmd = 80; 43ABSOLUTE t_status = 88; 44ABSOLUTE t_data = 96; 45 46; offsets in the per-target lun table 47ABSOLUTE target_id = 0x0; 48ABSOLUTE target_luntbl = 0x8; 49ABSOLUTE target_luntbl_tag = 0xc; 50 51;; interrupt codes 52; interrupts that needs a valid target/lun/tag 53ABSOLUTE int_done = 0xff00; 54ABSOLUTE int_msgin = 0xff01; 55ABSOLUTE int_extmsgin = 0xff02; 56ABSOLUTE int_extmsgdata = 0xff03; 57ABSOLUTE int_disc = 0xff04; 58; interrupts that don't have a valid I/T/Q 59ABSOLUTE int_resfail = 0xff80; 60ABSOLUTE int_err = 0xffff; 61 62; We use the various scratch[a-j] registers to keep internal status: 63 64; scratchA1: offset in data DSA (for save data pointer) 65; scratchB: save/restore DSA in data loop 66; scratchC: current target/lun/tag 67; scratchC0: flags 68ABSOLUTE f_c_target = 0x01 ; target valid 69ABSOLUTE f_c_lun = 0x02 ; lun valud 70ABSOLUTE f_c_tag = 0x04 ; tag valid 71ABSOLUTE f_c_data = 0x08 ; data I/O in progress 72ABSOLUTE f_c_data_mask = 0xf7 ; ~f_c_data 73ABSOLUTE f_c_sdp = 0x10 ; got save data pointer message 74; scratchC[1-3]: target/lun/tag 75 76; scratchD: current DSA in start cmd ring 77; scratchE0: index in start cmd ring 78ABSOLUTE ncmd_slots = 256 ; number of slots in CMD ring 79ABSOLUTE ncmd_slots_last = 0 ; == ncmd_slots in a 8bit counter 80; flags in a cmd slot 81ABSOLUTE f_cmd_free = 0x01 ; this slot is free 82ABSOLUTE f_cmd_ignore = 0x02 ; this slot is not free but don't start it 83; offsets in a cmd slot 84ABSOLUTE o_cmd_dsa = 0; also holds f_cmd_* 85; size of a cmd slot (for DSA increments) 86ABSOLUTE cmd_slot_size = 4; 87 88; SCRATCHE1: last status 89 90; SCRATCHE2: current command done slot 91ABSOLUTE ndone_slots = 256 ; number of slots in CMD ring 92ABSOLUTE ndone_slots_last = 0 ; == ndonemd_slots in a 8bit counter 93; SCRATCHF: pointer in command done ring 94 95ENTRY cmdr0; 96ENTRY cmdr1; 97ENTRY cmdr2; 98ENTRY cmdr3; 99ENTRY doner0; 100ENTRY doner1; 101ENTRY doner2; 102ENTRY doner3; 103ENTRY reselect; 104ENTRY led_on1; 105ENTRY led_on2; 106ENTRY led_off; 107ENTRY status; 108ENTRY msgin; 109ENTRY msgin_ack; 110ENTRY get_extmsgdata; 111ENTRY send_msgout; 112ENTRY script_sched; 113ENTRY load_targtable; 114 115EXTERN tlq_offset; 116EXTERN abs_msgin2; 117 118PROC esiop_script: 119 120no_cmd: 121 MOVE ISTAT & 0x10 TO SFBR; pending done command ? 122 INTFLY 0, IF NOT 0x00; 123reselect: 124 MOVE 0x00 TO SCRATCHA1; 125 MOVE 0x00 TO SCRATCHC0; 126 MOVE 0xff TO SCRATCHE1; 127; a NOP by default; patched with MOVE GPREG | 0x01 to GPREG on compile-time 128; option "SIOP_SYMLED" 129led_off: 130 NOP; 131 WAIT RESELECT REL(reselect_fail); 132; a NOP by default; patched with MOVE GPREG & 0xfe to GPREG on compile-time 133; option "SIOP_SYMLED" 134led_on2: 135 NOP; 136 MOVE SSID & 0x0f to SFBR; 137 MOVE SFBR to SCRATCHC1; 138 MOVE SCRATCHC0 | f_c_target to SCRATCHC0; save target 139 CLEAR CARRY; 140 MOVE SCRATCHC1 SHL SFBR; 141 MOVE SFBR SHL DSA0; target * 4 in dsa 142 MOVE 0x0 to DSA1; 143 MOVE 0x0 to DSA2; 144 MOVE 0x0 to DSA3; 145; load DSA for the target table 146load_targtable: 147 MOVE DSA0 + 0x00 to DSA0; host will patch 0x0 with base of table 148 MOVE DSA1 + 0x00 to DSA1 with carry; 149 MOVE DSA2 + 0x00 to DSA2 with carry; 150 MOVE DSA3 + 0x00 to DSA3 with carry; now dsa -> basetable + target * 4 151 LOAD DSA0, 4, FROM 0; now load DSA for this target 152 SELECT FROM target_id, REL(nextisn); 153nextisn: 154 MOVE 1, abs_msgin2, WHEN MSG_IN; 155 MOVE SFBR & 0x07 to SCRATCHC2; 156 MOVE SCRATCHC0 | f_c_lun to SCRATCHC0; save LUN 157 CLEAR ACK and CARRY; 158 MOVE SCRATCHC2 SHL SFBR; 159 MOVE SFBR SHL SFBR; 160 MOVE SFBR SHL SFBR; lun * 8 161 MOVE DSA0 + SFBR TO DSA0; 162 MOVE DSA1 + 0x0 TO DSA1 with carry; 163 MOVE DSA2 + 0x0 TO DSA2 with carry; 164 MOVE DSA3 + 0x0 TO DSA3 with carry; 165 LOAD SCRATCHB0, 4, from target_luntbl_tag; in case it's a tagged cmd 166 LOAD DSA0, 4, from target_luntbl; load DSA for this LUN 167 JUMP REL(waitphase), WHEN NOT MSG_IN; 168 MOVE 1, abs_msgin2, WHEN MSG_IN; 169 CLEAR ACK; 170 INT int_msgin, IF NOT 0x20; not a simple tag message, let host handle it 171 MOVE 1, abs_msgin2, WHEN MSG_IN; get tag 172 CLEAR ACK; 173 MOVE SFBR to SCRATCHA2; 174 MOVE SFBR to SCRATCHC3; 175 MOVE SCRATCHC0 | f_c_tag to SCRATCHC0; save TAG 176 CALL REL(restoredsa); switch to tag table DSA 177 MOVE 0x0 to SCRATCHA3; 178 CLEAR CARRY; 179 MOVE SCRATCHA2 SHL SCRATCHA2; 180 MOVE SCRATCHA3 SHL SCRATCHA3; 181 MOVE SCRATCHA2 SHL SCRATCHA2; 182 MOVE SCRATCHA3 SHL SCRATCHA3; TAG * 4 to SCRATCHA(2,3) 183 MOVE SCRATCHA2 TO SFBR; 184 MOVE DSA0 + SFBR TO DSA0; 185 MOVE DSA1 + 0x00 TO DSA1 with CARRY; 186 MOVE DSA2 + 0x00 TO DSA2 with CARRY; 187 MOVE DSA3 + 0x00 TO DSA3 with CARRY; 188 MOVE SCRATCHA3 TO SFBR; 189 MOVE DSA1 + SFBR TO DSA1; 190 MOVE DSA2 + 0x00 TO DSA2 with CARRY; 191 MOVE DSA3 + 0x00 TO DSA3 with CARRY; SCRACHA(2,3) + DSA to DSA 192 LOAD DSA0, 4, from 0; load DSA for this tag 193 JUMP REL(waitphase); 194 195reselect_fail: 196 ; check that host asserted SIGP, this'll clear SIGP in ISTAT 197 MOVE CTEST2 & 0x40 TO SFBR; 198 INT int_resfail, IF 0x00; 199script_sched: 200; Load ring DSA 201 MOVE SCRATCHD0 to SFBR; 202 MOVE SFBR to DSA0; 203 MOVE SCRATCHD1 to SFBR; 204 MOVE SFBR to DSA1; 205 MOVE SCRATCHD2 to SFBR; 206 MOVE SFBR to DSA2; 207 MOVE SCRATCHD3 to SFBR; 208 MOVE SFBR to DSA3; 209 LOAD DSA0,4, from o_cmd_dsa; get DSA and flags for this slot 210 MOVE DSA0 & f_cmd_free to SFBR; check flags 211 JUMP REL(no_cmd), IF NOT 0x0; 212 MOVE DSA0 & f_cmd_ignore to SFBR; 213 JUMP REL(ignore_cmd), IF NOT 0x0; 214 LOAD SCRATCHC0, 4, FROM tlq_offset; 215; this slot is busy, attempt to exec command 216 SELECT ATN FROM t_id, REL(reselect); 217; select either succeeded or timed out. 218; if timed out the STO interrupt will be posted at the first SCSI bus access 219; waiting for a valid phase, so we have to do it now. If not a MSG_OUT phase, 220; this is an error anyway (we selected with ATN) 221 INT int_err, WHEN NOT MSG_OUT; 222ignore_cmd: 223 MOVE SCRATCHD0 to SFBR; restore scheduler DSA 224 MOVE SFBR to DSA0; 225 MOVE SCRATCHD1 to SFBR; 226 MOVE SFBR to DSA1; 227 MOVE SCRATCHD2 to SFBR; 228 MOVE SFBR to DSA2; 229 MOVE SCRATCHD3 to SFBR; 230 MOVE SFBR to DSA3; 231 MOVE SCRATCHE0 + 1 to SCRATCHE0; 232 MOVE SCRATCHD0 + cmd_slot_size to SCRATCHD0; 233 MOVE SCRATCHD1 + 0 to SCRATCHD1 WITH CARRY; 234 MOVE SCRATCHD2 + 0 to SCRATCHD2 WITH CARRY; 235 MOVE SCRATCHD3 + 0 to SCRATCHD3 WITH CARRY; 236 MOVE SCRATCHE0 TO SFBR; 237 JUMP REL(handle_cmd), IF NOT ncmd_slots_last; 238; reset pointers to beggining of area 239cmdr0: 240 MOVE 0xff to SCRATCHD0; correct value will be patched by driver 241cmdr1: 242 MOVE 0xff to SCRATCHD1; 243cmdr2: 244 MOVE 0xff to SCRATCHD2; 245cmdr3: 246 MOVE 0xff to SCRATCHD3; 247 MOVE 0x00 to SCRATCHE0; 248handle_cmd: 249; to avoid race condition we have to load the DSA value before setting the 250; free flag, so we have to use a temp register. 251; use SCRATCHB0 so that we can CALL restoredsa later 252 LOAD SCRATCHB0, 4, FROM o_cmd_dsa; load DSA for this command in temp reg 253 MOVE SCRATCHB0 | f_cmd_free to SCRATCHB0; mark slot as free 254 STORE noflush SCRATCHB0, 4, FROM o_cmd_dsa; 255 MOVE SCRATCHB0 & f_cmd_ignore to SFBR; 256 JUMP REL(script_sched), IF NOT 0x00; next command if ignore 257 MOVE SCRATCHB0 & 0xfc to SCRATCHB0; clear f_cmd_* 258 CALL REL(restoredsa); and move SCRATCHB to DSA 259 260; a NOP by default; patched with MOVE GPREG & 0xfe to GPREG on compile-time 261; option "SIOP_SYMLED" 262led_on1: 263 NOP; 264 MOVE 0x00 TO SCRATCHA1; 265 MOVE 0xff TO SCRATCHE1; 266;we can now send our identify message 267send_msgout: ; entry point for msgout after a msgin or status phase 268 SET ATN; 269 CLEAR ACK; 270msgout: 271 MOVE FROM t_msg_out, WHEN MSG_OUT; 272 CLEAR ATN; 273 JUMP REL(waitphase); 274 275msgin_ack: 276 CLEAR ACK; 277waitphase: 278 JUMP REL(msgout), WHEN MSG_OUT; 279 JUMP REL(msgin), WHEN MSG_IN; 280 JUMP REL(dataout), WHEN DATA_OUT; 281 JUMP REL(datain), WHEN DATA_IN; 282 JUMP REL(cmdout), WHEN CMD; 283 JUMP REL(status), WHEN STATUS; 284 INT int_err; 285 286 287handle_sdp: 288 CLEAR ACK; 289 MOVE SCRATCHC0 | f_c_sdp TO SCRATCHC0; 290 ; should get a disconnect message now 291msgin: 292 CLEAR ATN 293 MOVE FROM t_msg_in, WHEN MSG_IN; 294handle_msgin: 295 JUMP REL(handle_cmpl), IF 0x00 ; command complete message 296 JUMP REL(handle_sdp), IF 0x02 ; save data pointer message 297 JUMP REL(handle_extin), IF 0x01 ; extended message 298 INT int_msgin, IF NOT 0x04; 299 CALL REL(disconnect) ; disconnect message 300; if we didn't get sdp, or if offset is 0, no need to interrupt 301 MOVE SCRATCHC0 & f_c_sdp TO SFBR; 302 JUMP REL(script_sched), if 0x00; 303 MOVE SCRATCHA1 TO SFBR; 304 JUMP REL(script_sched), if 0x00; 305; Ok, we need to save data pointers 306 INT int_disc; 307 308cmdout: 309 MOVE FROM t_cmd, WHEN CMD; 310 JUMP REL(waitphase); 311status: 312 MOVE FROM t_status, WHEN STATUS; 313 MOVE SFBR TO SCRATCHE1; 314 JUMP REL(waitphase); 315datain: 316 CALL REL(savedsa); 317 MOVE SCRATCHC0 | f_c_data TO SCRATCHC0; 318 datain_loop: 319 MOVE FROM t_data, WHEN DATA_IN; 320 MOVE SCRATCHA1 + 1 TO SCRATCHA1 ; adjust offset 321 MOVE DSA0 + 8 to DSA0; 322 MOVE DSA1 + 0 to DSA1 WITH CARRY; 323 MOVE DSA2 + 0 to DSA2 WITH CARRY; 324 MOVE DSA3 + 0 to DSA3 WITH CARRY; 325 JUMP REL(datain_loop), WHEN DATA_IN; 326 CALL REL(restoredsa); 327 MOVE SCRATCHC0 & f_c_data_mask TO SCRATCHC0; 328 JUMP REL(waitphase); 329 330dataout: 331 CALL REL(savedsa); 332 MOVE SCRATCHC0 | f_c_data TO SCRATCHC0; 333dataout_loop: 334 MOVE FROM t_data, WHEN DATA_OUT; 335 MOVE SCRATCHA1 + 1 TO SCRATCHA1 ; adjust offset 336 MOVE DSA0 + 8 to DSA0; 337 MOVE DSA1 + 0 to DSA1 WITH CARRY; 338 MOVE DSA2 + 0 to DSA2 WITH CARRY; 339 MOVE DSA3 + 0 to DSA3 WITH CARRY; 340 JUMP REL(dataout_loop), WHEN DATA_OUT; 341 CALL REL(restoredsa); 342 MOVE SCRATCHC0 & f_c_data_mask TO SCRATCHC0; 343 JUMP REL(waitphase); 344 345savedsa: 346 MOVE DSA0 to SFBR; 347 MOVE SFBR to SCRATCHB0; 348 MOVE DSA1 to SFBR; 349 MOVE SFBR to SCRATCHB1; 350 MOVE DSA2 to SFBR; 351 MOVE SFBR to SCRATCHB2; 352 MOVE DSA3 to SFBR; 353 MOVE SFBR to SCRATCHB3; 354 RETURN; 355 356restoredsa: 357 MOVE SCRATCHB0 TO SFBR; 358 MOVE SFBR TO DSA0; 359 MOVE SCRATCHB1 TO SFBR; 360 MOVE SFBR TO DSA1; 361 MOVE SCRATCHB2 TO SFBR; 362 MOVE SFBR TO DSA2; 363 MOVE SCRATCHB3 TO SFBR; 364 MOVE SFBR TO DSA3; 365 RETURN; 366 367disconnect: 368 MOVE SCNTL2 & 0x7f TO SCNTL2; 369 CLEAR ATN; 370 CLEAR ACK; 371 WAIT DISCONNECT; 372 RETURN; 373 374handle_cmpl: 375 CALL REL(disconnect); 376 MOVE SCRATCHE1 to SFBR; 377 INT int_done, IF NOT 0x00; if status is not "done", let host handle it 378 MOVE SCRATCHF0 to SFBR; load pointer in done ring 379 MOVE SFBR to DSA0; 380 MOVE SCRATCHF1 to SFBR; 381 MOVE SFBR to DSA1; 382 MOVE SCRATCHF2 to SFBR; 383 MOVE SFBR to DSA2; 384 MOVE SCRATCHF3 to SFBR; 385 MOVE SFBR to DSA3; 386wait_free: 387 LOAD SCRATCHA0, 1, from 0; 388 MOVE SCRATCHA0 to SFBR; 389 JUMP REL(wait_free), if not 0; wait for slot to be free 390 STORE NOFLUSH SCRATCHC0, 4, from 0; save current target/lun/flag 391 MOVE SCRATCHF0 + 4 to SCRATCHF0; advance to next slot 392 MOVE SCRATCHF1 + 0 to SCRATCHF1 with carry; 393 MOVE SCRATCHF2 + 0 to SCRATCHF2 with carry; 394 MOVE SCRATCHF3 + 0 to SCRATCHF3 with carry; 395 MOVE SCRATCHE2 + 1 to SCRATCHE2; 396 MOVE SCRATCHE2 to SFBR; 397 JUMP REL(is_done), if not ndone_slots_last; 398doner0: 399 MOVE 0xff to SCRATCHF0; driver will change 0xff to base of ring 400doner1: 401 MOVE 0xff to SCRATCHF1; 402doner2: 403 MOVE 0xff to SCRATCHF2; 404doner3: 405 MOVE 0xff to SCRATCHF3; 406 MOVE 0 to SCRATCHE2; 407is_done: 408 MOVE ISTAT | 0x10 TO ISTAT; signal that cmd is done in ISTAT 409 JUMP REL(script_sched); and attempt next command 410 411handle_extin: 412 CLEAR ACK; 413 MOVE FROM t_ext_msg_in, WHEN MSG_IN; 414 INT int_extmsgin; /* let host fill in t_ext_msg_data */ 415get_extmsgdata: 416 CLEAR ACK; 417 MOVE FROM t_ext_msg_data, WHEN MSG_IN; 418 INT int_extmsgdata; 419 420PROC esiop_led_on: 421 MOVE GPREG & 0xfe TO GPREG; 422 423PROC esiop_led_off: 424 MOVE GPREG | 0x01 TO GPREG; 425