mesh.c revision 1.32
1 /* $NetBSD: mesh.c,v 1.32 2009/09/26 15:40:02 tsutsui Exp $ */ 2 3 /*- 4 * Copyright (c) 2000 Tsubai Masanari. 5 * Copyright (c) 1999 Internet Research Institute, Inc. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by 19 * Internet Research Institute, Inc. 20 * 4. The name of the author may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 32 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __KERNEL_RCSID(0, "$NetBSD: mesh.c,v 1.32 2009/09/26 15:40:02 tsutsui Exp $"); 37 38 #include <sys/param.h> 39 #include <sys/buf.h> 40 #include <sys/device.h> 41 #include <sys/errno.h> 42 #include <sys/kernel.h> 43 #include <sys/malloc.h> 44 #include <sys/queue.h> 45 #include <sys/systm.h> 46 47 #include <uvm/uvm_extern.h> 48 49 #include <dev/scsipi/scsi_all.h> 50 #include <dev/scsipi/scsipi_all.h> 51 #include <dev/scsipi/scsiconf.h> 52 #include <dev/scsipi/scsi_message.h> 53 54 #include <dev/ofw/openfirm.h> 55 56 #include <machine/autoconf.h> 57 #include <machine/cpu.h> 58 #include <machine/pio.h> 59 60 #include <macppc/dev/dbdma.h> 61 #include <macppc/dev/meshreg.h> 62 63 #ifdef MESH_DEBUG 64 # define DPRINTF printf 65 #else 66 # define DPRINTF while (0) printf 67 #endif 68 69 #define T_SYNCMODE 0x01 /* target uses sync mode */ 70 #define T_SYNCNEGO 0x02 /* sync negotiation done */ 71 72 struct mesh_tinfo { 73 int flags; 74 int period; 75 int offset; 76 }; 77 78 /* scb flags */ 79 #define MESH_POLL 0x01 80 #define MESH_CHECK 0x02 81 #define MESH_READ 0x80 82 83 struct mesh_scb { 84 TAILQ_ENTRY(mesh_scb) chain; 85 int flags; 86 struct scsipi_xfer *xs; 87 struct scsipi_generic cmd; 88 int cmdlen; 89 int target; /* target SCSI ID */ 90 int resid; 91 vaddr_t daddr; 92 vsize_t dlen; 93 int status; 94 }; 95 96 /* sc_flags value */ 97 #define MESH_DMA_ACTIVE 0x01 98 99 struct mesh_softc { 100 device_t sc_dev; /* us as a device */ 101 struct scsipi_channel sc_channel; 102 struct scsipi_adapter sc_adapter; 103 104 u_char *sc_reg; /* MESH base address */ 105 dbdma_regmap_t *sc_dmareg; /* DMA register address */ 106 dbdma_command_t *sc_dmacmd; /* DMA command area */ 107 108 int sc_flags; 109 int sc_cfflags; /* copy of config flags */ 110 int sc_meshid; /* MESH version */ 111 int sc_minsync; /* minimum sync period */ 112 int sc_irq; 113 int sc_freq; /* SCSI bus frequency in MHz */ 114 int sc_id; /* our SCSI ID */ 115 struct mesh_tinfo sc_tinfo[8]; /* target information */ 116 117 int sc_nextstate; 118 int sc_prevphase; 119 struct mesh_scb *sc_nexus; /* current command */ 120 121 int sc_msgout; 122 int sc_imsglen; 123 u_char sc_imsg[16]; 124 u_char sc_omsg[16]; 125 126 TAILQ_HEAD(, mesh_scb) free_scb; 127 TAILQ_HEAD(, mesh_scb) ready_scb; 128 struct mesh_scb sc_scb[16]; 129 }; 130 131 /* mesh_msgout() values */ 132 #define SEND_REJECT 1 133 #define SEND_IDENTIFY 2 134 #define SEND_SDTR 4 135 136 static inline int mesh_read_reg(struct mesh_softc *, int); 137 static inline void mesh_set_reg(struct mesh_softc *, int, int); 138 139 int mesh_match(device_t, cfdata_t, void *); 140 void mesh_attach(device_t, device_t, void *); 141 void mesh_shutdownhook(void *); 142 int mesh_intr(void *); 143 void mesh_error(struct mesh_softc *, struct mesh_scb *, int, int); 144 void mesh_select(struct mesh_softc *, struct mesh_scb *); 145 void mesh_identify(struct mesh_softc *, struct mesh_scb *); 146 void mesh_command(struct mesh_softc *, struct mesh_scb *); 147 void mesh_dma_setup(struct mesh_softc *, struct mesh_scb *); 148 void mesh_dataio(struct mesh_softc *, struct mesh_scb *); 149 void mesh_status(struct mesh_softc *, struct mesh_scb *); 150 void mesh_msgin(struct mesh_softc *, struct mesh_scb *); 151 void mesh_msgout(struct mesh_softc *, int); 152 void mesh_bus_reset(struct mesh_softc *); 153 void mesh_reset(struct mesh_softc *); 154 int mesh_stp(struct mesh_softc *, int); 155 void mesh_setsync(struct mesh_softc *, struct mesh_tinfo *); 156 struct mesh_scb *mesh_get_scb(struct mesh_softc *); 157 void mesh_free_scb(struct mesh_softc *, struct mesh_scb *); 158 void mesh_scsi_request(struct scsipi_channel *, 159 scsipi_adapter_req_t, void *); 160 void mesh_sched(struct mesh_softc *); 161 int mesh_poll(struct mesh_softc *, struct scsipi_xfer *); 162 void mesh_done(struct mesh_softc *, struct mesh_scb *); 163 void mesh_timeout(void *); 164 void mesh_minphys(struct buf *); 165 166 167 #define MESH_DATAOUT 0 168 #define MESH_DATAIN MESH_STATUS0_IO 169 #define MESH_COMMAND MESH_STATUS0_CD 170 #define MESH_STATUS (MESH_STATUS0_CD | MESH_STATUS0_IO) 171 #define MESH_MSGOUT (MESH_STATUS0_MSG | MESH_STATUS0_CD) 172 #define MESH_MSGIN (MESH_STATUS0_MSG | MESH_STATUS0_CD | MESH_STATUS0_IO) 173 174 #define MESH_SELECTING 8 175 #define MESH_IDENTIFY 9 176 #define MESH_COMPLETE 10 177 #define MESH_BUSFREE 11 178 #define MESH_UNKNOWN -1 179 180 #define MESH_PHASE_MASK (MESH_STATUS0_MSG | MESH_STATUS0_CD | MESH_STATUS0_IO) 181 182 CFATTACH_DECL_NEW(mesh, sizeof(struct mesh_softc), 183 mesh_match, mesh_attach, NULL, NULL); 184 185 int 186 mesh_match(device_t parent, cfdata_t cf, void *aux) 187 { 188 struct confargs *ca = aux; 189 char compat[32]; 190 191 if (strcmp(ca->ca_name, "mesh") == 0) 192 return 1; 193 194 memset(compat, 0, sizeof(compat)); 195 OF_getprop(ca->ca_node, "compatible", compat, sizeof(compat)); 196 if (strcmp(compat, "chrp,mesh0") == 0) 197 return 1; 198 199 return 0; 200 } 201 202 void 203 mesh_attach(device_t parent, device_t self, void *aux) 204 { 205 struct mesh_softc *sc = device_private(self); 206 struct confargs *ca = aux; 207 int i; 208 u_int *reg; 209 210 sc->sc_dev = self; 211 reg = ca->ca_reg; 212 reg[0] += ca->ca_baseaddr; 213 reg[2] += ca->ca_baseaddr; 214 sc->sc_reg = mapiodev(reg[0], reg[1]); 215 sc->sc_irq = ca->ca_intr[0]; 216 sc->sc_dmareg = mapiodev(reg[2], reg[3]); 217 218 sc->sc_cfflags = device_cfdata(self)->cf_flags; 219 sc->sc_meshid = mesh_read_reg(sc, MESH_MESH_ID) & 0x1f; 220 #if 0 221 if (sc->sc_meshid != (MESH_SIGNATURE & 0x1f) { 222 aprint_error(": unknown MESH ID (0x%x)\n", sc->sc_meshid); 223 return; 224 } 225 #endif 226 if (OF_getprop(ca->ca_node, "clock-frequency", &sc->sc_freq, 4) != 4) { 227 aprint_error(": cannot get clock-frequency\n"); 228 return; 229 } 230 sc->sc_freq /= 1000000; /* in MHz */ 231 sc->sc_minsync = 25; /* maximum sync rate = 10MB/sec */ 232 sc->sc_id = 7; 233 234 TAILQ_INIT(&sc->free_scb); 235 TAILQ_INIT(&sc->ready_scb); 236 for (i = 0; i < sizeof(sc->sc_scb)/sizeof(sc->sc_scb[0]); i++) 237 TAILQ_INSERT_TAIL(&sc->free_scb, &sc->sc_scb[i], chain); 238 239 sc->sc_dmacmd = dbdma_alloc(sizeof(dbdma_command_t) * 20); 240 241 mesh_reset(sc); 242 mesh_bus_reset(sc); 243 244 aprint_normal(" irq %d: %dMHz, SCSI ID %d\n", 245 sc->sc_irq, sc->sc_freq, sc->sc_id); 246 247 sc->sc_adapter.adapt_dev = self; 248 sc->sc_adapter.adapt_nchannels = 1; 249 sc->sc_adapter.adapt_openings = 7; 250 sc->sc_adapter.adapt_max_periph = 1; 251 sc->sc_adapter.adapt_ioctl = NULL; 252 sc->sc_adapter.adapt_minphys = mesh_minphys; 253 sc->sc_adapter.adapt_request = mesh_scsi_request; 254 255 sc->sc_channel.chan_adapter = &sc->sc_adapter; 256 sc->sc_channel.chan_bustype = &scsi_bustype; 257 sc->sc_channel.chan_channel = 0; 258 sc->sc_channel.chan_ntargets = 8; 259 sc->sc_channel.chan_nluns = 8; 260 sc->sc_channel.chan_id = sc->sc_id; 261 262 config_found(self, &sc->sc_channel, scsiprint); 263 264 intr_establish(sc->sc_irq, IST_EDGE, IPL_BIO, mesh_intr, sc); 265 266 /* Reset SCSI bus when halt. */ 267 shutdownhook_establish(mesh_shutdownhook, sc); 268 } 269 270 #define MESH_SET_XFER(sc, count) do { \ 271 mesh_set_reg(sc, MESH_XFER_COUNT0, count); \ 272 mesh_set_reg(sc, MESH_XFER_COUNT1, count >> 8); \ 273 } while (0) 274 275 #define MESH_GET_XFER(sc) ((mesh_read_reg(sc, MESH_XFER_COUNT1) << 8) | \ 276 mesh_read_reg(sc, MESH_XFER_COUNT0)) 277 278 int 279 mesh_read_reg(struct mesh_softc *sc, int reg) 280 { 281 return in8(sc->sc_reg + reg); 282 } 283 284 void 285 mesh_set_reg(struct mesh_softc *sc, int reg, int val) 286 { 287 out8(sc->sc_reg + reg, val); 288 } 289 290 void 291 mesh_shutdownhook(void *arg) 292 { 293 struct mesh_softc *sc = arg; 294 295 /* Set to async mode. */ 296 mesh_set_reg(sc, MESH_SYNC_PARAM, 2); 297 mesh_bus_reset(sc); 298 } 299 300 #ifdef MESH_DEBUG 301 static char scsi_phase[][8] = { 302 "DATAOUT", 303 "DATAIN", 304 "COMMAND", 305 "STATUS", 306 "", 307 "", 308 "MSGOUT", 309 "MSGIN" 310 }; 311 #endif 312 313 int 314 mesh_intr(void *arg) 315 { 316 struct mesh_softc *sc = arg; 317 struct mesh_scb *scb; 318 int fifocnt; 319 u_char intr, exception, error, status0, status1; 320 321 intr = mesh_read_reg(sc, MESH_INTERRUPT); 322 if (intr == 0) { 323 DPRINTF("%s: stray interrupt\n", device_xname(sc->sc_dev)); 324 return 0; 325 } 326 327 exception = mesh_read_reg(sc, MESH_EXCEPTION); 328 error = mesh_read_reg(sc, MESH_ERROR); 329 status0 = mesh_read_reg(sc, MESH_BUS_STATUS0); 330 status1 = mesh_read_reg(sc, MESH_BUS_STATUS1); 331 332 /* clear interrupt */ 333 mesh_set_reg(sc, MESH_INTERRUPT, intr); 334 335 #ifdef MESH_DEBUG 336 { 337 char buf1[64], buf2[64]; 338 339 snprintb(buf1, sizeof buf1, MESH_STATUS0_BITMASK, status0); 340 snprintb(buf2, sizeof buf2, MESH_EXC_BITMASK, exception); 341 printf("mesh_intr status0 = 0x%s (%s), exc = 0x%s\n", 342 buf1, scsi_phase[status0 & 7], buf2); 343 } 344 #endif 345 346 scb = sc->sc_nexus; 347 if (scb == NULL) { 348 DPRINTF("%s: NULL nexus\n", device_xname(sc->sc_dev)); 349 return 1; 350 } 351 352 if (intr & MESH_INTR_CMDDONE) { 353 if (sc->sc_flags & MESH_DMA_ACTIVE) { 354 dbdma_stop(sc->sc_dmareg); 355 356 sc->sc_flags &= ~MESH_DMA_ACTIVE; 357 scb->resid = MESH_GET_XFER(sc); 358 359 fifocnt = mesh_read_reg(sc, MESH_FIFO_COUNT); 360 if (fifocnt != 0) { 361 if (scb->flags & MESH_READ) { 362 char *cp; 363 364 cp = (char *)scb->daddr + scb->dlen 365 - fifocnt; 366 DPRINTF("fifocnt = %d, resid = %d\n", 367 fifocnt, scb->resid); 368 while (fifocnt > 0) { 369 *cp++ = mesh_read_reg(sc, 370 MESH_FIFO); 371 fifocnt--; 372 } 373 } else { 374 mesh_set_reg(sc, MESH_SEQUENCE, 375 MESH_CMD_FLUSH_FIFO); 376 } 377 } else { 378 /* Clear all interrupts */ 379 mesh_set_reg(sc, MESH_INTERRUPT, 7); 380 } 381 } 382 } 383 384 if (intr & MESH_INTR_ERROR) { 385 printf("%s: error %02x %02x\n", 386 device_xname(sc->sc_dev), error, exception); 387 mesh_error(sc, scb, error, 0); 388 return 1; 389 } 390 391 if (intr & MESH_INTR_EXCEPTION) { 392 /* selection timeout */ 393 if (exception & MESH_EXC_SELTO) { 394 mesh_error(sc, scb, 0, exception); 395 return 1; 396 } 397 398 /* phase mismatch */ 399 if (exception & MESH_EXC_PHASEMM) { 400 DPRINTF("%s: PHASE MISMATCH; nextstate = %d -> ", 401 device_xname(sc->sc_dev), sc->sc_nextstate); 402 sc->sc_nextstate = status0 & MESH_PHASE_MASK; 403 404 DPRINTF("%d, resid = %d\n", 405 sc->sc_nextstate, scb->resid); 406 } 407 } 408 409 if (sc->sc_nextstate == MESH_UNKNOWN) 410 sc->sc_nextstate = status0 & MESH_PHASE_MASK; 411 412 switch (sc->sc_nextstate) { 413 414 case MESH_IDENTIFY: 415 mesh_identify(sc, scb); 416 break; 417 case MESH_COMMAND: 418 mesh_command(sc, scb); 419 break; 420 case MESH_DATAIN: 421 case MESH_DATAOUT: 422 mesh_dataio(sc, scb); 423 break; 424 case MESH_STATUS: 425 mesh_status(sc, scb); 426 break; 427 case MESH_MSGIN: 428 mesh_msgin(sc, scb); 429 break; 430 case MESH_COMPLETE: 431 mesh_done(sc, scb); 432 break; 433 434 default: 435 printf("%s: unknown state (%d)\n", device_xname(sc->sc_dev), 436 sc->sc_nextstate); 437 scb->xs->error = XS_DRIVER_STUFFUP; 438 mesh_done(sc, scb); 439 } 440 441 return 1; 442 } 443 444 void 445 mesh_error(struct mesh_softc *sc, struct mesh_scb *scb, int error, int exception) 446 { 447 if (error & MESH_ERR_SCSI_RESET) { 448 printf("%s: SCSI RESET\n", device_xname(sc->sc_dev)); 449 450 /* Wait until the RST signal is deasserted. */ 451 while (mesh_read_reg(sc, MESH_BUS_STATUS1) & MESH_STATUS1_RST); 452 mesh_reset(sc); 453 return; 454 } 455 456 if (error & MESH_ERR_PARITY_ERR0) { 457 printf("%s: parity error\n", device_xname(sc->sc_dev)); 458 scb->xs->error = XS_DRIVER_STUFFUP; 459 } 460 461 if (error & MESH_ERR_DISCONNECT) { 462 printf("%s: unexpected disconnect\n", device_xname(sc->sc_dev)); 463 if (sc->sc_nextstate != MESH_COMPLETE) 464 scb->xs->error = XS_DRIVER_STUFFUP; 465 } 466 467 if (exception & MESH_EXC_SELTO) { 468 /* XXX should reset bus here? */ 469 scb->xs->error = XS_SELTIMEOUT; 470 } 471 472 mesh_done(sc, scb); 473 } 474 475 void 476 mesh_select(struct mesh_softc *sc, struct mesh_scb *scb) 477 { 478 struct mesh_tinfo *ti = &sc->sc_tinfo[scb->target]; 479 int timeout; 480 481 DPRINTF("mesh_select\n"); 482 483 mesh_setsync(sc, ti); 484 MESH_SET_XFER(sc, 0); 485 486 /* arbitration */ 487 488 /* 489 * MESH mistakenly asserts TARGET ID bit along with its own ID bit 490 * in arbitration phase (like selection). So we should load 491 * initiator ID to DestID register temporarily. 492 */ 493 mesh_set_reg(sc, MESH_DEST_ID, sc->sc_id); 494 mesh_set_reg(sc, MESH_INTR_MASK, 0); /* disable intr. */ 495 mesh_set_reg(sc, MESH_SEQUENCE, MESH_CMD_ARBITRATE); 496 497 while (mesh_read_reg(sc, MESH_INTERRUPT) == 0); 498 mesh_set_reg(sc, MESH_INTERRUPT, 1); 499 mesh_set_reg(sc, MESH_INTR_MASK, 7); 500 501 /* selection */ 502 mesh_set_reg(sc, MESH_DEST_ID, scb->target); 503 mesh_set_reg(sc, MESH_SEQUENCE, MESH_CMD_SELECT | MESH_SEQ_ATN); 504 505 sc->sc_prevphase = MESH_SELECTING; 506 sc->sc_nextstate = MESH_IDENTIFY; 507 508 timeout = mstohz(scb->xs->timeout); 509 if (timeout == 0) 510 timeout = 1; 511 512 callout_reset(&scb->xs->xs_callout, timeout, mesh_timeout, scb); 513 } 514 515 void 516 mesh_identify(struct mesh_softc *sc, struct mesh_scb *scb) 517 { 518 struct mesh_tinfo *ti = &sc->sc_tinfo[scb->target]; 519 520 DPRINTF("mesh_identify\n"); 521 mesh_set_reg(sc, MESH_SEQUENCE, MESH_CMD_FLUSH_FIFO); 522 523 if ((ti->flags & T_SYNCNEGO) == 0) { 524 ti->period = sc->sc_minsync; 525 ti->offset = 15; 526 mesh_msgout(sc, SEND_IDENTIFY | SEND_SDTR); 527 sc->sc_nextstate = MESH_MSGIN; 528 } else { 529 mesh_msgout(sc, SEND_IDENTIFY); 530 sc->sc_nextstate = MESH_COMMAND; 531 } 532 } 533 534 void 535 mesh_command(struct mesh_softc *sc, struct mesh_scb *scb) 536 { 537 int i; 538 char *cmdp; 539 540 #ifdef MESH_DEBUG 541 printf("mesh_command cdb = %02x", scb->cmd.opcode); 542 for (i = 0; i < 5; i++) 543 printf(" %02x", scb->cmd.bytes[i]); 544 printf("\n"); 545 #endif 546 547 mesh_set_reg(sc, MESH_SEQUENCE, MESH_CMD_FLUSH_FIFO); 548 549 MESH_SET_XFER(sc, scb->cmdlen); 550 mesh_set_reg(sc, MESH_SEQUENCE, MESH_CMD_COMMAND); 551 552 cmdp = (char *)&scb->cmd; 553 for (i = 0; i < scb->cmdlen; i++) 554 mesh_set_reg(sc, MESH_FIFO, *cmdp++); 555 556 if (scb->resid == 0) 557 sc->sc_nextstate = MESH_STATUS; /* no data xfer */ 558 else 559 sc->sc_nextstate = MESH_DATAIN; 560 } 561 562 void 563 mesh_dma_setup(struct mesh_softc *sc, struct mesh_scb *scb) 564 { 565 int datain = scb->flags & MESH_READ; 566 dbdma_command_t *cmdp; 567 u_int cmd; 568 vaddr_t va; 569 int count, offset; 570 571 cmdp = sc->sc_dmacmd; 572 cmd = datain ? DBDMA_CMD_IN_MORE : DBDMA_CMD_OUT_MORE; 573 574 count = scb->dlen; 575 576 if (count / PAGE_SIZE > 32) 577 panic("mesh: transfer size >= 128k"); 578 579 va = scb->daddr; 580 offset = va & PGOFSET; 581 582 /* if va is not page-aligned, setup the first page */ 583 if (offset != 0) { 584 int rest = PAGE_SIZE - offset; /* the rest in the page */ 585 586 if (count > rest) { /* if continues to next page */ 587 DBDMA_BUILD(cmdp, cmd, 0, rest, vtophys(va), 588 DBDMA_INT_NEVER, DBDMA_WAIT_NEVER, 589 DBDMA_BRANCH_NEVER); 590 count -= rest; 591 va += rest; 592 cmdp++; 593 } 594 } 595 596 /* now va is page-aligned */ 597 while (count > PAGE_SIZE) { 598 DBDMA_BUILD(cmdp, cmd, 0, PAGE_SIZE, vtophys(va), 599 DBDMA_INT_NEVER, DBDMA_WAIT_NEVER, DBDMA_BRANCH_NEVER); 600 count -= PAGE_SIZE; 601 va += PAGE_SIZE; 602 cmdp++; 603 } 604 605 /* the last page (count <= PAGE_SIZE here) */ 606 cmd = datain ? DBDMA_CMD_IN_LAST : DBDMA_CMD_OUT_LAST; 607 DBDMA_BUILD(cmdp, cmd , 0, count, vtophys(va), 608 DBDMA_INT_NEVER, DBDMA_WAIT_NEVER, DBDMA_BRANCH_NEVER); 609 cmdp++; 610 611 DBDMA_BUILD(cmdp, DBDMA_CMD_STOP, 0, 0, 0, 612 DBDMA_INT_NEVER, DBDMA_WAIT_NEVER, DBDMA_BRANCH_NEVER); 613 } 614 615 void 616 mesh_dataio(struct mesh_softc *sc, struct mesh_scb *scb) 617 { 618 DPRINTF("mesh_dataio len = %ld (%s)\n", scb->dlen, 619 scb->flags & MESH_READ ? "read" : "write"); 620 621 mesh_dma_setup(sc, scb); 622 623 if (scb->dlen == 65536) 624 MESH_SET_XFER(sc, 0); /* TC = 0 means 64KB transfer */ 625 else 626 MESH_SET_XFER(sc, scb->dlen); 627 628 if (scb->flags & MESH_READ) 629 mesh_set_reg(sc, MESH_SEQUENCE, MESH_CMD_DATAIN | MESH_SEQ_DMA); 630 else 631 mesh_set_reg(sc, MESH_SEQUENCE, MESH_CMD_DATAOUT | MESH_SEQ_DMA); 632 dbdma_start(sc->sc_dmareg, sc->sc_dmacmd); 633 sc->sc_flags |= MESH_DMA_ACTIVE; 634 sc->sc_nextstate = MESH_STATUS; 635 } 636 637 void 638 mesh_status(struct mesh_softc *sc, struct mesh_scb *scb) 639 { 640 if (mesh_read_reg(sc, MESH_FIFO_COUNT) == 0) { /* XXX cheat */ 641 DPRINTF("mesh_status(0)\n"); 642 MESH_SET_XFER(sc, 1); 643 mesh_set_reg(sc, MESH_SEQUENCE, MESH_CMD_STATUS); 644 sc->sc_nextstate = MESH_STATUS; 645 return; 646 } 647 648 scb->status = mesh_read_reg(sc, MESH_FIFO); 649 DPRINTF("mesh_status(1): status = 0x%x\n", scb->status); 650 if (mesh_read_reg(sc, MESH_FIFO_COUNT) != 0) 651 DPRINTF("FIFO_COUNT=%d\n", mesh_read_reg(sc, MESH_FIFO_COUNT)); 652 653 mesh_set_reg(sc, MESH_SEQUENCE, MESH_CMD_FLUSH_FIFO); 654 MESH_SET_XFER(sc, 1); 655 mesh_set_reg(sc, MESH_SEQUENCE, MESH_CMD_MSGIN); 656 657 sc->sc_nextstate = MESH_MSGIN; 658 } 659 660 void 661 mesh_msgin(struct mesh_softc *sc, struct mesh_scb *scb) 662 { 663 DPRINTF("mesh_msgin\n"); 664 665 if (mesh_read_reg(sc, MESH_FIFO_COUNT) == 0) { /* XXX cheat */ 666 MESH_SET_XFER(sc, 1); 667 mesh_set_reg(sc, MESH_SEQUENCE, MESH_CMD_MSGIN); 668 sc->sc_imsglen = 0; 669 sc->sc_nextstate = MESH_MSGIN; 670 return; 671 } 672 673 sc->sc_imsg[sc->sc_imsglen++] = mesh_read_reg(sc, MESH_FIFO); 674 675 if (sc->sc_imsglen == 1 && MSG_IS1BYTE(sc->sc_imsg[0])) 676 goto gotit; 677 if (sc->sc_imsglen == 2 && MSG_IS2BYTE(sc->sc_imsg[0])) 678 goto gotit; 679 if (sc->sc_imsglen >= 3 && MSG_ISEXTENDED(sc->sc_imsg[0]) && 680 sc->sc_imsglen == sc->sc_imsg[1] + 2) 681 goto gotit; 682 683 sc->sc_nextstate = MESH_MSGIN; 684 MESH_SET_XFER(sc, 1); 685 mesh_set_reg(sc, MESH_SEQUENCE, MESH_CMD_MSGIN); 686 return; 687 688 gotit: 689 #ifdef MESH_DEBUG 690 printf("msgin:"); 691 for (i = 0; i < sc->sc_imsglen; i++) 692 printf(" 0x%02x", sc->sc_imsg[i]); 693 printf("\n"); 694 #endif 695 696 switch (sc->sc_imsg[0]) { 697 case MSG_CMDCOMPLETE: 698 mesh_set_reg(sc, MESH_SEQUENCE, MESH_CMD_BUSFREE); 699 sc->sc_nextstate = MESH_COMPLETE; 700 sc->sc_imsglen = 0; 701 return; 702 703 case MSG_MESSAGE_REJECT: 704 if (sc->sc_msgout & SEND_SDTR) { 705 printf("SDTR rejected\n"); 706 printf("using async mode\n"); 707 sc->sc_tinfo[scb->target].period = 0; 708 sc->sc_tinfo[scb->target].offset = 0; 709 mesh_setsync(sc, &sc->sc_tinfo[scb->target]); 710 break; 711 } 712 break; 713 714 case MSG_NOOP: 715 break; 716 717 case MSG_EXTENDED: 718 goto extended_msg; 719 720 default: 721 scsipi_printaddr(scb->xs->xs_periph); 722 printf("unrecognized MESSAGE(0x%02x); sending REJECT\n", 723 sc->sc_imsg[0]); 724 725 reject: 726 mesh_msgout(sc, SEND_REJECT); 727 return; 728 } 729 goto done; 730 731 extended_msg: 732 /* process an extended message */ 733 switch (sc->sc_imsg[2]) { 734 case MSG_EXT_SDTR: 735 { 736 struct mesh_tinfo *ti = &sc->sc_tinfo[scb->target]; 737 int period = sc->sc_imsg[3]; 738 int offset = sc->sc_imsg[4]; 739 int r = 250 / period; 740 int s = (100*250) / period - 100 * r; 741 742 if (period < sc->sc_minsync) { 743 ti->period = sc->sc_minsync; 744 ti->offset = 15; 745 mesh_msgout(sc, SEND_SDTR); 746 return; 747 } 748 scsipi_printaddr(scb->xs->xs_periph); 749 /* XXX if (offset != 0) ... */ 750 printf("max sync rate %d.%02dMb/s\n", r, s); 751 ti->period = period; 752 ti->offset = offset; 753 ti->flags |= T_SYNCNEGO; 754 ti->flags |= T_SYNCMODE; 755 mesh_setsync(sc, ti); 756 goto done; 757 } 758 default: 759 printf("%s target %d: rejecting extended message 0x%x\n", 760 device_xname(sc->sc_dev), scb->target, sc->sc_imsg[0]); 761 goto reject; 762 } 763 764 done: 765 sc->sc_imsglen = 0; 766 sc->sc_nextstate = MESH_UNKNOWN; 767 768 mesh_set_reg(sc, MESH_SEQUENCE, MESH_CMD_BUSFREE); /* XXX really? */ 769 } 770 771 void 772 mesh_msgout(struct mesh_softc *sc, int msg) 773 { 774 struct mesh_scb *scb = sc->sc_nexus; 775 struct mesh_tinfo *ti; 776 int lun, len, i; 777 778 DPRINTF("mesh_msgout: sending"); 779 780 sc->sc_msgout = msg; 781 len = 0; 782 783 if (msg & SEND_REJECT) { 784 DPRINTF(" REJECT"); 785 sc->sc_omsg[len++] = MSG_MESSAGE_REJECT; 786 } 787 if (msg & SEND_IDENTIFY) { 788 DPRINTF(" IDENTIFY"); 789 lun = scb->xs->xs_periph->periph_lun; 790 sc->sc_omsg[len++] = MSG_IDENTIFY(lun, 0); 791 } 792 if (msg & SEND_SDTR) { 793 DPRINTF(" SDTR"); 794 ti = &sc->sc_tinfo[scb->target]; 795 sc->sc_omsg[len++] = MSG_EXTENDED; 796 sc->sc_omsg[len++] = 3; 797 sc->sc_omsg[len++] = MSG_EXT_SDTR; 798 sc->sc_omsg[len++] = ti->period; 799 sc->sc_omsg[len++] = ti->offset; 800 } 801 DPRINTF("\n"); 802 803 MESH_SET_XFER(sc, len); 804 if (len == 1) { 805 mesh_set_reg(sc, MESH_SEQUENCE, MESH_CMD_MSGOUT); 806 mesh_set_reg(sc, MESH_FIFO, sc->sc_omsg[0]); 807 } else { 808 mesh_set_reg(sc, MESH_SEQUENCE, MESH_CMD_MSGOUT | MESH_SEQ_ATN); 809 810 for (i = 0; i < len - 1; i++) 811 mesh_set_reg(sc, MESH_FIFO, sc->sc_omsg[i]); 812 813 /* Wait for the FIFO empty... */ 814 while (mesh_read_reg(sc, MESH_FIFO_COUNT) > 0); 815 816 /* ...then write the last byte. */ 817 mesh_set_reg(sc, MESH_FIFO, sc->sc_omsg[i]); 818 } 819 sc->sc_nextstate = MESH_UNKNOWN; 820 } 821 822 void 823 mesh_bus_reset(struct mesh_softc *sc) 824 { 825 DPRINTF("mesh_bus_reset\n"); 826 827 /* Disable interrupts. */ 828 mesh_set_reg(sc, MESH_INTR_MASK, 0); 829 830 /* Assert RST line. */ 831 mesh_set_reg(sc, MESH_BUS_STATUS1, MESH_STATUS1_RST); 832 delay(50); 833 mesh_set_reg(sc, MESH_BUS_STATUS1, 0); 834 835 mesh_reset(sc); 836 } 837 838 void 839 mesh_reset(struct mesh_softc *sc) 840 { 841 int i; 842 843 DPRINTF("mesh_reset\n"); 844 845 /* Reset DMA first. */ 846 dbdma_reset(sc->sc_dmareg); 847 848 /* Disable interrupts. */ 849 mesh_set_reg(sc, MESH_INTR_MASK, 0); 850 851 mesh_set_reg(sc, MESH_SEQUENCE, MESH_CMD_RESET_MESH); 852 delay(1); 853 854 /* Wait for reset done. */ 855 while (mesh_read_reg(sc, MESH_INTERRUPT) == 0); 856 857 /* Clear interrupts */ 858 mesh_set_reg(sc, MESH_INTERRUPT, 0x7); 859 860 /* Set SCSI ID */ 861 mesh_set_reg(sc, MESH_SOURCE_ID, sc->sc_id); 862 863 /* Set to async mode by default. */ 864 mesh_set_reg(sc, MESH_SYNC_PARAM, 2); 865 866 /* Set selection timeout to 250ms. */ 867 mesh_set_reg(sc, MESH_SEL_TIMEOUT, 250 * sc->sc_freq / 500); 868 869 /* Enable parity check. */ 870 mesh_set_reg(sc, MESH_SEQUENCE, MESH_CMD_ENABLE_PARITY); 871 872 /* Enable all interrupts. */ 873 mesh_set_reg(sc, MESH_INTR_MASK, 0x7); 874 875 for (i = 0; i < 7; i++) { 876 struct mesh_tinfo *ti = &sc->sc_tinfo[i]; 877 878 ti->flags = 0; 879 ti->period = ti->offset = 0; 880 if (sc->sc_cfflags & (0x100 << i)) 881 ti->flags |= T_SYNCNEGO; 882 } 883 sc->sc_nexus = NULL; 884 } 885 886 int 887 mesh_stp(struct mesh_softc *sc, int v) 888 { 889 /* 890 * stp(v) = 5 * clock_period (v == 0) 891 * = (v + 2) * 2 clock_period (v > 0) 892 */ 893 894 if (v == 0) 895 return 5 * 250 / sc->sc_freq; 896 else 897 return (v + 2) * 2 * 250 / sc->sc_freq; 898 } 899 900 void 901 mesh_setsync(struct mesh_softc *sc, struct mesh_tinfo *ti) 902 { 903 int period = ti->period; 904 int offset = ti->offset; 905 int v; 906 907 if ((ti->flags & T_SYNCMODE) == 0) 908 offset = 0; 909 910 if (offset == 0) { /* async mode */ 911 mesh_set_reg(sc, MESH_SYNC_PARAM, 2); 912 return; 913 } 914 915 v = period * sc->sc_freq / 250 / 2 - 2; 916 if (v < 0) 917 v = 0; 918 if (mesh_stp(sc, v) < period) 919 v++; 920 if (v > 15) 921 v = 15; 922 mesh_set_reg(sc, MESH_SYNC_PARAM, (offset << 4) | v); 923 } 924 925 struct mesh_scb * 926 mesh_get_scb(struct mesh_softc *sc) 927 { 928 struct mesh_scb *scb; 929 int s; 930 931 s = splbio(); 932 if ((scb = sc->free_scb.tqh_first) != NULL) 933 TAILQ_REMOVE(&sc->free_scb, scb, chain); 934 splx(s); 935 936 return scb; 937 } 938 939 void 940 mesh_free_scb(struct mesh_softc *sc, struct mesh_scb *scb) 941 { 942 int s; 943 944 s = splbio(); 945 TAILQ_INSERT_HEAD(&sc->free_scb, scb, chain); 946 splx(s); 947 } 948 949 void 950 mesh_scsi_request(struct scsipi_channel *chan, scsipi_adapter_req_t req, void *arg) 951 { 952 struct scsipi_xfer *xs; 953 struct scsipi_periph *periph; 954 struct mesh_softc *sc = device_private(chan->chan_adapter->adapt_dev); 955 struct mesh_scb *scb; 956 u_int flags; 957 int s; 958 959 switch (req) { 960 case ADAPTER_REQ_RUN_XFER: 961 xs = arg; 962 periph = xs->xs_periph; 963 flags = xs->xs_control; 964 965 966 if ((scb = mesh_get_scb(sc)) == NULL) { 967 xs->error = XS_RESOURCE_SHORTAGE; 968 scsipi_done(xs); 969 return; 970 } 971 scb->xs = xs; 972 scb->flags = 0; 973 scb->status = 0; 974 scb->daddr = (vaddr_t)xs->data; 975 scb->dlen = xs->datalen; 976 scb->resid = xs->datalen; 977 memcpy(&scb->cmd, xs->cmd, xs->cmdlen); 978 scb->cmdlen = xs->cmdlen; 979 scb->target = periph->periph_target; 980 sc->sc_imsglen = 0; /* XXX ? */ 981 982 #ifdef MESH_DEBUG 983 { 984 int i; 985 printf("mesh_scsi_cmd: target = %d, cdb = %02x", 986 scb->target, scb->cmd.opcode); 987 for (i = 0; i < 5; i++) 988 printf(" %02x", scb->cmd.bytes[i]); 989 printf("\n"); 990 } 991 #endif 992 993 if (flags & XS_CTL_POLL) 994 scb->flags |= MESH_POLL; 995 #if 0 996 if (flags & XS_CTL_DATA_OUT) 997 scb->flags &= ~MESH_READ; 998 #endif 999 if (flags & XS_CTL_DATA_IN) 1000 scb->flags |= MESH_READ; 1001 1002 s = splbio(); 1003 1004 TAILQ_INSERT_TAIL(&sc->ready_scb, scb, chain); 1005 1006 if (sc->sc_nexus == NULL) /* IDLE */ 1007 mesh_sched(sc); 1008 1009 splx(s); 1010 1011 if ((flags & XS_CTL_POLL) == 0) 1012 return; 1013 1014 if (mesh_poll(sc, xs)) { 1015 printf("%s: timeout\n", device_xname(sc->sc_dev)); 1016 if (mesh_poll(sc, xs)) 1017 printf("%s: timeout again\n", 1018 device_xname(sc->sc_dev)); 1019 } 1020 return; 1021 1022 case ADAPTER_REQ_GROW_RESOURCES: 1023 /* XXX Not supported. */ 1024 return; 1025 1026 case ADAPTER_REQ_SET_XFER_MODE: 1027 /* XXX Not supported. */ 1028 return; 1029 } 1030 1031 } 1032 1033 void 1034 mesh_sched(struct mesh_softc *sc) 1035 { 1036 struct scsipi_xfer *xs; 1037 struct mesh_scb *scb; 1038 1039 scb = sc->ready_scb.tqh_first; 1040 start: 1041 if (scb == NULL) 1042 return; 1043 1044 xs = scb->xs; 1045 1046 if (sc->sc_nexus == NULL) { 1047 TAILQ_REMOVE(&sc->ready_scb, scb, chain); 1048 sc->sc_nexus = scb; 1049 mesh_select(sc, scb); 1050 return; 1051 } 1052 1053 scb = scb->chain.tqe_next; 1054 goto start; 1055 } 1056 1057 int 1058 mesh_poll(struct mesh_softc *sc, struct scsipi_xfer *xs) 1059 { 1060 int count = xs->timeout; 1061 1062 while (count) { 1063 if (mesh_read_reg(sc, MESH_INTERRUPT)) 1064 mesh_intr(sc); 1065 1066 if (xs->xs_status & XS_STS_DONE) 1067 return 0; 1068 delay(1000); 1069 count--; 1070 }; 1071 return 1; 1072 } 1073 1074 void 1075 mesh_done(struct mesh_softc *sc, struct mesh_scb *scb) 1076 { 1077 struct scsipi_xfer *xs = scb->xs; 1078 1079 DPRINTF("mesh_done\n"); 1080 1081 sc->sc_nextstate = MESH_BUSFREE; 1082 sc->sc_nexus = NULL; 1083 1084 callout_stop(&scb->xs->xs_callout); 1085 1086 if (scb->status == SCSI_BUSY) { 1087 xs->error = XS_BUSY; 1088 printf("Target busy\n"); 1089 } 1090 1091 xs->status = scb->status; 1092 xs->resid = scb->resid; 1093 if (scb->status == SCSI_CHECK) { 1094 xs->error = XS_BUSY; 1095 } 1096 1097 mesh_set_reg(sc, MESH_SYNC_PARAM, 2); 1098 1099 if ((xs->xs_control & XS_CTL_POLL) == 0) 1100 mesh_sched(sc); 1101 1102 scsipi_done(xs); 1103 mesh_free_scb(sc, scb); 1104 } 1105 1106 void 1107 mesh_timeout(void *arg) 1108 { 1109 struct mesh_scb *scb = arg; 1110 struct mesh_softc *sc = 1111 device_private(scb->xs->xs_periph->periph_channel->chan_adapter->adapt_dev); 1112 int s; 1113 int status0, status1; 1114 int intr, error, exception, imsk; 1115 1116 printf("%s: timeout state %d\n", device_xname(sc->sc_dev), 1117 sc->sc_nextstate); 1118 1119 intr = mesh_read_reg(sc, MESH_INTERRUPT); 1120 imsk = mesh_read_reg(sc, MESH_INTR_MASK); 1121 exception = mesh_read_reg(sc, MESH_EXCEPTION); 1122 error = mesh_read_reg(sc, MESH_ERROR); 1123 status0 = mesh_read_reg(sc, MESH_BUS_STATUS0); 1124 status1 = mesh_read_reg(sc, MESH_BUS_STATUS1); 1125 1126 printf("%s: intr/msk %02x/%02x, exc %02x, err %02x, st0/1 %02x/%02x\n", 1127 device_xname(sc->sc_dev), 1128 intr, imsk, exception, error, status0, status1); 1129 1130 s = splbio(); 1131 if (sc->sc_flags & MESH_DMA_ACTIVE) { 1132 printf("mesh: resetting DMA\n"); 1133 dbdma_reset(sc->sc_dmareg); 1134 } 1135 scb->xs->error = XS_TIMEOUT; 1136 1137 mesh_set_reg(sc, MESH_SEQUENCE, MESH_CMD_BUSFREE); 1138 sc->sc_nextstate = MESH_COMPLETE; 1139 1140 splx(s); 1141 } 1142 1143 void 1144 mesh_minphys(struct buf *bp) 1145 { 1146 if (bp->b_bcount > 64*1024) 1147 bp->b_bcount = 64*1024; 1148 1149 minphys(bp); 1150 } 1151
Indexes created Thu Sep 25 16:09:42 GMT 2025