intio.c revision 1.49
1 /* $NetBSD: intio.c,v 1.49 2021/08/07 16:19:07 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* 30 * NetBSD/x68k internal I/O virtual bus. 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: intio.c,v 1.49 2021/08/07 16:19:07 thorpej Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/device.h> 39 #include <sys/malloc.h> 40 #include <sys/mbuf.h> 41 #include <sys/extent.h> 42 #include <uvm/uvm_extern.h> 43 44 #include <machine/bus.h> 45 #include <machine/cpu.h> 46 #include <machine/frame.h> 47 48 #include <arch/x68k/dev/intiovar.h> 49 50 51 /* 52 * bus_space(9) interface 53 */ 54 static int intio_bus_space_map(bus_space_tag_t, bus_addr_t, bus_size_t, int, bus_space_handle_t *); 55 static void intio_bus_space_unmap(bus_space_tag_t, bus_space_handle_t, bus_size_t); 56 static int intio_bus_space_subregion(bus_space_tag_t, bus_space_handle_t, bus_size_t, bus_size_t, bus_space_handle_t *); 57 58 static struct x68k_bus_space intio_bus = { 59 #if 0 60 X68K_INTIO_BUS, 61 #endif 62 intio_bus_space_map, intio_bus_space_unmap, intio_bus_space_subregion, 63 x68k_bus_space_alloc, x68k_bus_space_free, 64 #if 0 65 x68k_bus_space_barrier, 66 #endif 67 68 0 69 }; 70 71 /* 72 * bus_dma(9) interface 73 */ 74 #define INTIO_DMA_BOUNCE_THRESHOLD (16 * 1024 * 1024) 75 int _intio_bus_dmamap_create(bus_dma_tag_t, bus_size_t, int, 76 bus_size_t, bus_size_t, int, bus_dmamap_t *); 77 void _intio_bus_dmamap_destroy(bus_dma_tag_t, bus_dmamap_t); 78 int _intio_bus_dmamap_load(bus_dma_tag_t, bus_dmamap_t, void *, 79 bus_size_t, struct proc *, int); 80 int _intio_bus_dmamap_load_mbuf(bus_dma_tag_t, bus_dmamap_t, 81 struct mbuf *, int); 82 int _intio_bus_dmamap_load_uio(bus_dma_tag_t, bus_dmamap_t, 83 struct uio *, int); 84 int _intio_bus_dmamap_load_raw(bus_dma_tag_t, bus_dmamap_t, 85 bus_dma_segment_t *, int, bus_size_t, int); 86 void _intio_bus_dmamap_unload(bus_dma_tag_t, bus_dmamap_t); 87 void _intio_bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, 88 bus_addr_t, bus_size_t, int); 89 90 int _intio_bus_dmamem_alloc(bus_dma_tag_t, bus_size_t, bus_size_t, 91 bus_size_t, bus_dma_segment_t *, int, int *, int); 92 93 int _intio_dma_alloc_bouncebuf(bus_dma_tag_t, bus_dmamap_t, 94 bus_size_t, int); 95 void _intio_dma_free_bouncebuf(bus_dma_tag_t, bus_dmamap_t); 96 97 struct x68k_bus_dma intio_bus_dma = { 98 INTIO_DMA_BOUNCE_THRESHOLD, 99 _intio_bus_dmamap_create, 100 _intio_bus_dmamap_destroy, 101 _intio_bus_dmamap_load, 102 _intio_bus_dmamap_load_mbuf, 103 _intio_bus_dmamap_load_uio, 104 _intio_bus_dmamap_load_raw, 105 _intio_bus_dmamap_unload, 106 _intio_bus_dmamap_sync, 107 _intio_bus_dmamem_alloc, 108 x68k_bus_dmamem_free, 109 x68k_bus_dmamem_map, 110 x68k_bus_dmamem_unmap, 111 x68k_bus_dmamem_mmap, 112 }; 113 114 /* 115 * autoconf stuff 116 */ 117 static int intio_match(device_t, cfdata_t, void *); 118 static void intio_attach(device_t, device_t, void *); 119 static int intio_search(device_t, cfdata_t, const int *, void *); 120 static int intio_print(void *, const char *); 121 static void intio_alloc_system_ports(struct intio_softc*); 122 123 CFATTACH_DECL_NEW(intio, sizeof(struct intio_softc), 124 intio_match, intio_attach, NULL, NULL); 125 126 extern struct cfdriver intio_cd; 127 128 static int intio_attached; 129 130 static struct intio_interrupt_vector { 131 intio_intr_handler_t iiv_handler; 132 void *iiv_arg; 133 struct evcnt *iiv_evcnt; 134 } iiv[256] = {{0,},}; 135 136 #ifdef DEBUG 137 int intio_debug = 0; 138 #endif 139 140 static int 141 intio_match(device_t parent, cfdata_t cf, void *aux) 142 { 143 144 if (strcmp(aux, intio_cd.cd_name) != 0) 145 return (0); 146 if (intio_attached) 147 return (0); 148 149 return (1); 150 } 151 152 static void 153 intio_attach(device_t parent, device_t self, void *aux) 154 { 155 struct intio_softc *sc = device_private(self); 156 struct intio_attach_args ia; 157 158 intio_attached = 1; 159 160 aprint_normal(" mapped at %8p\n", intiobase); 161 162 sc->sc_map = extent_create("intiomap", 163 INTIOBASE, 164 INTIOBASE + 0x400000, 165 NULL, 0, EX_WAITOK); 166 intio_alloc_system_ports(sc); 167 168 sc->sc_bst = &intio_bus; 169 sc->sc_bst->x68k_bus_device = self; 170 sc->sc_dmat = &intio_bus_dma; 171 sc->sc_dmac = 0; 172 173 memset(iiv, 0, sizeof(struct intio_interrupt_vector) * 256); 174 175 ia.ia_bst = sc->sc_bst; 176 ia.ia_dmat = sc->sc_dmat; 177 178 config_search(self, &ia, 179 CFARGS(.search = intio_search)); 180 } 181 182 static int 183 intio_search(device_t parent, cfdata_t cf, const int *ldesc, void *aux) 184 { 185 struct intio_softc *sc = device_private(parent); 186 struct intio_attach_args *ia = aux; 187 188 ia->ia_bst = sc->sc_bst; 189 ia->ia_dmat = sc->sc_dmat; 190 ia->ia_name = cf->cf_name; 191 ia->ia_addr = cf->cf_addr; 192 ia->ia_intr = cf->cf_intr; 193 ia->ia_dma = cf->cf_dma; 194 ia->ia_dmaintr = cf->cf_dmaintr; 195 196 if (config_probe(parent, cf, ia)) 197 config_attach(parent, cf, ia, intio_print, CFARGS_NONE); 198 199 return (0); 200 } 201 202 static int 203 intio_print(void *aux, const char *name) 204 { 205 struct intio_attach_args *ia = aux; 206 207 /* if (ia->ia_addr > 0) */ 208 aprint_normal(" addr 0x%06x", ia->ia_addr); 209 if (ia->ia_intr > 0) 210 aprint_normal(" intr 0x%02x", ia->ia_intr); 211 if (ia->ia_dma >= 0) { 212 aprint_normal(" using DMA ch%d", ia->ia_dma); 213 if (ia->ia_dmaintr > 0) 214 aprint_normal(" intr 0x%02x and 0x%02x", 215 ia->ia_dmaintr, ia->ia_dmaintr+1); 216 } 217 218 return (QUIET); 219 } 220 221 /* 222 * intio memory map manager 223 */ 224 225 int 226 intio_map_allocate_region(device_t parent, struct intio_attach_args *ia, 227 enum intio_map_flag flag) 228 { 229 struct intio_softc *sc = device_private(parent); 230 struct extent *map = sc->sc_map; 231 int r; 232 233 r = extent_alloc_region(map, ia->ia_addr, ia->ia_size, 0); 234 #ifdef DEBUG 235 if (intio_debug) 236 extent_print(map); 237 #endif 238 if (r == 0) { 239 if (flag != INTIO_MAP_ALLOCATE) 240 extent_free(map, ia->ia_addr, ia->ia_size, 0); 241 return 0; 242 } 243 244 return -1; 245 } 246 247 int 248 intio_map_free_region(device_t parent, struct intio_attach_args *ia) 249 { 250 struct intio_softc *sc = device_private(parent); 251 struct extent *map = sc->sc_map; 252 253 extent_free(map, ia->ia_addr, ia->ia_size, 0); 254 #ifdef DEBUG 255 if (intio_debug) 256 extent_print(map); 257 #endif 258 return 0; 259 } 260 261 void 262 intio_alloc_system_ports(struct intio_softc *sc) 263 { 264 extent_alloc_region(sc->sc_map, INTIO_SYSPORT, 16, 0); 265 extent_alloc_region(sc->sc_map, INTIO_SICILIAN, 0x2000, 0); 266 } 267 268 269 /* 270 * intio bus space stuff. 271 */ 272 static int 273 intio_bus_space_map(bus_space_tag_t t, bus_addr_t bpa, bus_size_t size, 274 int flags, bus_space_handle_t *bshp) 275 { 276 /* 277 * Intio bus is mapped permanently. 278 */ 279 *bshp = (bus_space_handle_t)IIOV(bpa); 280 281 /* 282 * Some devices are mapped on odd or even addresses only. 283 */ 284 if ((flags & BUS_SPACE_MAP_SHIFTED_MASK) == BUS_SPACE_MAP_SHIFTED_ODD) 285 *bshp += 0x80000001; 286 if ((flags & BUS_SPACE_MAP_SHIFTED_MASK) == BUS_SPACE_MAP_SHIFTED_EVEN) 287 *bshp += 0x80000000; 288 289 return (0); 290 } 291 292 static void 293 intio_bus_space_unmap(bus_space_tag_t t, bus_space_handle_t bsh, 294 bus_size_t size) 295 { 296 return; 297 } 298 299 static int 300 intio_bus_space_subregion(bus_space_tag_t t, bus_space_handle_t bsh, 301 bus_size_t offset, bus_size_t size, bus_space_handle_t *nbshp) 302 { 303 304 *nbshp = bsh + offset; 305 return (0); 306 } 307 308 309 /* 310 * interrupt handler 311 */ 312 int 313 intio_intr_establish(int vector, const char *name, intio_intr_handler_t handler, 314 void *arg) 315 { 316 317 return intio_intr_establish_ext(vector, name, "intr", handler, arg); 318 } 319 320 int 321 intio_intr_establish_ext(int vector, const char *name1, const char *name2, 322 intio_intr_handler_t handler, void *arg) 323 { 324 struct evcnt *evcnt; 325 326 if (vector < 16) 327 panic("Invalid interrupt vector"); 328 if (iiv[vector].iiv_handler) 329 return EBUSY; 330 331 evcnt = malloc(sizeof(*evcnt), M_DEVBUF, M_WAITOK); 332 evcnt_attach_dynamic(evcnt, EVCNT_TYPE_INTR, NULL, name1, name2); 333 334 iiv[vector].iiv_handler = handler; 335 iiv[vector].iiv_arg = arg; 336 iiv[vector].iiv_evcnt = evcnt; 337 338 return 0; 339 } 340 341 int 342 intio_intr_disestablish(int vector, void *arg) 343 { 344 if (iiv[vector].iiv_handler == 0 || iiv[vector].iiv_arg != arg) 345 return EINVAL; 346 iiv[vector].iiv_handler = 0; 347 iiv[vector].iiv_arg = 0; 348 evcnt_detach(iiv[vector].iiv_evcnt); 349 free(iiv[vector].iiv_evcnt, M_DEVBUF); 350 351 return 0; 352 } 353 354 int 355 intio_intr(struct frame *frame) 356 { 357 int vector = frame->f_vector / 4; 358 359 if (iiv[vector].iiv_handler == 0) { 360 printf("Stray interrupt: %d type %x, pc %x\n", 361 vector, frame->f_format, frame->f_pc); 362 return 0; 363 } 364 365 iiv[vector].iiv_evcnt->ev_count++; 366 367 return (*(iiv[vector].iiv_handler))(iiv[vector].iiv_arg); 368 } 369 370 /* 371 * Intio I/O controller interrupt 372 */ 373 static u_int8_t intio_ivec = 0; 374 375 void 376 intio_set_ivec(int vec) 377 { 378 vec &= 0xfc; 379 380 if (intio_ivec && intio_ivec != (vec & 0xfc)) 381 panic("Wrong interrupt vector for Sicilian."); 382 383 intio_ivec = vec; 384 intio_set_sicilian_ivec(vec); 385 } 386 387 388 /* 389 * intio bus DMA stuff. stolen from arch/i386/isa/isa_machdep.c 390 */ 391 392 /* 393 * Create an INTIO DMA map. 394 */ 395 int 396 _intio_bus_dmamap_create(bus_dma_tag_t t, bus_size_t size, int nsegments, 397 bus_size_t maxsegsz, bus_size_t boundary, int flags, bus_dmamap_t *dmamp) 398 { 399 struct intio_dma_cookie *cookie; 400 bus_dmamap_t map; 401 int error, cookieflags; 402 size_t cookiesize; 403 extern paddr_t avail_end; 404 405 /* Call common function to create the basic map. */ 406 error = x68k_bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, 407 flags, dmamp); 408 if (error) 409 return (error); 410 411 map = *dmamp; 412 map->x68k_dm_cookie = NULL; 413 414 cookiesize = sizeof(struct intio_dma_cookie); 415 416 /* 417 * INTIO only has 24-bits of address space. This means 418 * we can't DMA to pages over 16M. In order to DMA to 419 * arbitrary buffers, we use "bounce buffers" - pages 420 * in memory below the 16M boundary. On DMA reads, 421 * DMA happens to the bounce buffers, and is copied into 422 * the caller's buffer. On writes, data is copied into 423 * but bounce buffer, and the DMA happens from those 424 * pages. To software using the DMA mapping interface, 425 * this looks simply like a data cache. 426 * 427 * If we have more than 16M of RAM in the system, we may 428 * need bounce buffers. We check and remember that here. 429 * 430 * ...or, there is an opposite case. The most segments 431 * a transfer will require is (maxxfer / PAGE_SIZE) + 1. If 432 * the caller can't handle that many segments (e.g. the 433 * DMAC), we may have to bounce it as well. 434 */ 435 if (avail_end <= t->_bounce_thresh) 436 /* Bouncing not necessary due to memory size. */ 437 map->x68k_dm_bounce_thresh = 0; 438 cookieflags = 0; 439 if (map->x68k_dm_bounce_thresh != 0 || 440 ((map->x68k_dm_size / PAGE_SIZE) + 1) > map->x68k_dm_segcnt) { 441 cookieflags |= ID_MIGHT_NEED_BOUNCE; 442 cookiesize += (sizeof(bus_dma_segment_t) * map->x68k_dm_segcnt); 443 } 444 445 /* 446 * Allocate our cookie. 447 */ 448 cookie = malloc(cookiesize, M_DMAMAP, 449 ((flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK) | M_ZERO); 450 if (cookie == NULL) { 451 error = ENOMEM; 452 goto out; 453 } 454 cookie->id_flags = cookieflags; 455 map->x68k_dm_cookie = cookie; 456 457 if (cookieflags & ID_MIGHT_NEED_BOUNCE) { 458 /* 459 * Allocate the bounce pages now if the caller 460 * wishes us to do so. 461 */ 462 if ((flags & BUS_DMA_ALLOCNOW) == 0) 463 goto out; 464 465 error = _intio_dma_alloc_bouncebuf(t, map, size, flags); 466 } 467 468 out: 469 if (error) { 470 if (map->x68k_dm_cookie != NULL) 471 free(map->x68k_dm_cookie, M_DMAMAP); 472 x68k_bus_dmamap_destroy(t, map); 473 } 474 return (error); 475 } 476 477 /* 478 * Destroy an INTIO DMA map. 479 */ 480 void 481 _intio_bus_dmamap_destroy(bus_dma_tag_t t, bus_dmamap_t map) 482 { 483 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 484 485 /* 486 * Free any bounce pages this map might hold. 487 */ 488 if (cookie->id_flags & ID_HAS_BOUNCE) 489 _intio_dma_free_bouncebuf(t, map); 490 491 free(cookie, M_DMAMAP); 492 x68k_bus_dmamap_destroy(t, map); 493 } 494 495 /* 496 * Load an INTIO DMA map with a linear buffer. 497 */ 498 int 499 _intio_bus_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map, void *buf, 500 bus_size_t buflen, struct proc *p, int flags) 501 { 502 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 503 int error; 504 505 /* 506 * Make sure that on error condition we return "no valid mappings." 507 */ 508 map->dm_mapsize = 0; 509 map->dm_nsegs = 0; 510 511 /* 512 * Try to load the map the normal way. If this errors out, 513 * and we can bounce, we will. 514 */ 515 error = x68k_bus_dmamap_load(t, map, buf, buflen, p, flags); 516 if (error == 0 || (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0) 517 return (error); 518 519 /* 520 * Allocate bounce pages, if necessary. 521 */ 522 if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) { 523 error = _intio_dma_alloc_bouncebuf(t, map, buflen, flags); 524 if (error) 525 return (error); 526 } 527 528 /* 529 * Cache a pointer to the caller's buffer and load the DMA map 530 * with the bounce buffer. 531 */ 532 cookie->id_origbuf = buf; 533 cookie->id_origbuflen = buflen; 534 cookie->id_buftype = ID_BUFTYPE_LINEAR; 535 error = x68k_bus_dmamap_load(t, map, cookie->id_bouncebuf, buflen, 536 p, flags); 537 if (error) { 538 /* 539 * Free the bounce pages, unless our resources 540 * are reserved for our exclusive use. 541 */ 542 if ((map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 543 _intio_dma_free_bouncebuf(t, map); 544 return (error); 545 } 546 547 /* ...so _intio_bus_dmamap_sync() knows we're bouncing */ 548 cookie->id_flags |= ID_IS_BOUNCING; 549 return (0); 550 } 551 552 /* 553 * Like _intio_bus_dmamap_load(), but for mbufs. 554 */ 555 int 556 _intio_bus_dmamap_load_mbuf(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m0, 557 int flags) 558 { 559 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 560 int error; 561 562 /* 563 * Make sure on error condition we return "no valid mappings." 564 */ 565 map->dm_mapsize = 0; 566 map->dm_nsegs = 0; 567 568 #ifdef DIAGNOSTIC 569 if ((m0->m_flags & M_PKTHDR) == 0) 570 panic("_intio_bus_dmamap_load_mbuf: no packet header"); 571 #endif 572 573 if (m0->m_pkthdr.len > map->x68k_dm_size) 574 return (EINVAL); 575 576 /* 577 * Try to load the map the normal way. If this errors out, 578 * and we can bounce, we will. 579 */ 580 error = x68k_bus_dmamap_load_mbuf(t, map, m0, flags); 581 if (error == 0 || (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0) 582 return (error); 583 584 /* 585 * Allocate bounce pages, if necessary. 586 */ 587 if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) { 588 error = _intio_dma_alloc_bouncebuf(t, map, m0->m_pkthdr.len, 589 flags); 590 if (error) 591 return (error); 592 } 593 594 /* 595 * Cache a pointer to the caller's buffer and load the DMA map 596 * with the bounce buffer. 597 */ 598 cookie->id_origbuf = m0; 599 cookie->id_origbuflen = m0->m_pkthdr.len; /* not really used */ 600 cookie->id_buftype = ID_BUFTYPE_MBUF; 601 error = x68k_bus_dmamap_load(t, map, cookie->id_bouncebuf, 602 m0->m_pkthdr.len, NULL, flags); 603 if (error) { 604 /* 605 * Free the bounce pages, unless our resources 606 * are reserved for our exclusive use. 607 */ 608 if ((map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 609 _intio_dma_free_bouncebuf(t, map); 610 return (error); 611 } 612 613 /* ...so _intio_bus_dmamap_sync() knows we're bouncing */ 614 cookie->id_flags |= ID_IS_BOUNCING; 615 return (0); 616 } 617 618 /* 619 * Like _intio_bus_dmamap_load(), but for uios. 620 */ 621 int 622 _intio_bus_dmamap_load_uio(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio, 623 int flags) 624 { 625 panic("_intio_bus_dmamap_load_uio: not implemented"); 626 } 627 628 /* 629 * Like _intio_bus_dmamap_load(), but for raw memory allocated with 630 * bus_dmamem_alloc(). 631 */ 632 int 633 _intio_bus_dmamap_load_raw(bus_dma_tag_t t, bus_dmamap_t map, 634 bus_dma_segment_t *segs, int nsegs, bus_size_t size, int flags) 635 { 636 637 panic("_intio_bus_dmamap_load_raw: not implemented"); 638 } 639 640 /* 641 * Unload an INTIO DMA map. 642 */ 643 void 644 _intio_bus_dmamap_unload(bus_dma_tag_t t, bus_dmamap_t map) 645 { 646 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 647 648 /* 649 * If we have bounce pages, free them, unless they're 650 * reserved for our exclusive use. 651 */ 652 if ((cookie->id_flags & ID_HAS_BOUNCE) && 653 (map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 654 _intio_dma_free_bouncebuf(t, map); 655 656 cookie->id_flags &= ~ID_IS_BOUNCING; 657 cookie->id_buftype = ID_BUFTYPE_INVALID; 658 659 /* 660 * Do the generic bits of the unload. 661 */ 662 x68k_bus_dmamap_unload(t, map); 663 } 664 665 /* 666 * Synchronize an INTIO DMA map. 667 */ 668 void 669 _intio_bus_dmamap_sync(bus_dma_tag_t t, bus_dmamap_t map, bus_addr_t offset, 670 bus_size_t len, int ops) 671 { 672 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 673 674 /* 675 * Mixing PRE and POST operations is not allowed. 676 */ 677 if ((ops & (BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE)) != 0 && 678 (ops & (BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE)) != 0) 679 panic("_intio_bus_dmamap_sync: mix PRE and POST"); 680 681 #ifdef DIAGNOSTIC 682 if ((ops & (BUS_DMASYNC_PREWRITE|BUS_DMASYNC_POSTREAD)) != 0) { 683 if (offset >= map->dm_mapsize) 684 panic("_intio_bus_dmamap_sync: bad offset"); 685 if (len == 0 || (offset + len) > map->dm_mapsize) 686 panic("_intio_bus_dmamap_sync: bad length"); 687 } 688 #endif 689 690 /* 691 * If we're not bouncing, just return; nothing to do. 692 */ 693 if ((cookie->id_flags & ID_IS_BOUNCING) == 0) 694 return; 695 696 switch (cookie->id_buftype) { 697 case ID_BUFTYPE_LINEAR: 698 /* 699 * Nothing to do for pre-read. 700 */ 701 702 if (ops & BUS_DMASYNC_PREWRITE) { 703 /* 704 * Copy the caller's buffer to the bounce buffer. 705 */ 706 memcpy((char *)cookie->id_bouncebuf + offset, 707 (char *)cookie->id_origbuf + offset, len); 708 } 709 710 if (ops & BUS_DMASYNC_POSTREAD) { 711 /* 712 * Copy the bounce buffer to the caller's buffer. 713 */ 714 memcpy((char *)cookie->id_origbuf + offset, 715 (char *)cookie->id_bouncebuf + offset, len); 716 } 717 718 /* 719 * Nothing to do for post-write. 720 */ 721 break; 722 723 case ID_BUFTYPE_MBUF: 724 { 725 struct mbuf *m, *m0 = cookie->id_origbuf; 726 bus_size_t minlen, moff; 727 728 /* 729 * Nothing to do for pre-read. 730 */ 731 732 if (ops & BUS_DMASYNC_PREWRITE) { 733 /* 734 * Copy the caller's buffer to the bounce buffer. 735 */ 736 m_copydata(m0, offset, len, 737 (char *)cookie->id_bouncebuf + offset); 738 } 739 740 if (ops & BUS_DMASYNC_POSTREAD) { 741 /* 742 * Copy the bounce buffer to the caller's buffer. 743 */ 744 for (moff = offset, m = m0; m != NULL && len != 0; 745 m = m->m_next) { 746 /* Find the beginning mbuf. */ 747 if (moff >= m->m_len) { 748 moff -= m->m_len; 749 continue; 750 } 751 752 /* 753 * Now at the first mbuf to sync; nail 754 * each one until we have exhausted the 755 * length. 756 */ 757 minlen = len < m->m_len - moff ? 758 len : m->m_len - moff; 759 760 memcpy(mtod(m, char *) + moff, 761 (char *)cookie->id_bouncebuf + offset, 762 minlen); 763 764 moff = 0; 765 len -= minlen; 766 offset += minlen; 767 } 768 } 769 770 /* 771 * Nothing to do for post-write. 772 */ 773 break; 774 } 775 776 case ID_BUFTYPE_UIO: 777 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_UIO"); 778 break; 779 780 case ID_BUFTYPE_RAW: 781 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_RAW"); 782 break; 783 784 case ID_BUFTYPE_INVALID: 785 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_INVALID"); 786 break; 787 788 default: 789 printf("unknown buffer type %d\n", cookie->id_buftype); 790 panic("_intio_bus_dmamap_sync"); 791 } 792 } 793 794 /* 795 * Allocate memory safe for INTIO DMA. 796 */ 797 int 798 _intio_bus_dmamem_alloc(bus_dma_tag_t t, bus_size_t size, bus_size_t alignment, 799 bus_size_t boundary, bus_dma_segment_t *segs, int nsegs, int *rsegs, 800 int flags) 801 { 802 paddr_t high; 803 extern paddr_t avail_end; 804 805 if (avail_end > INTIO_DMA_BOUNCE_THRESHOLD) 806 high = trunc_page(INTIO_DMA_BOUNCE_THRESHOLD); 807 else 808 high = trunc_page(avail_end); 809 810 return (x68k_bus_dmamem_alloc_range(t, size, alignment, boundary, 811 segs, nsegs, rsegs, flags, 0, high)); 812 } 813 814 /********************************************************************** 815 * INTIO DMA utility functions 816 **********************************************************************/ 817 818 int 819 _intio_dma_alloc_bouncebuf(bus_dma_tag_t t, bus_dmamap_t map, bus_size_t size, 820 int flags) 821 { 822 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 823 int error = 0; 824 825 cookie->id_bouncebuflen = round_page(size); 826 error = _intio_bus_dmamem_alloc(t, cookie->id_bouncebuflen, 827 PAGE_SIZE, map->x68k_dm_boundary, cookie->id_bouncesegs, 828 map->x68k_dm_segcnt, &cookie->id_nbouncesegs, flags); 829 if (error) 830 goto out; 831 error = x68k_bus_dmamem_map(t, cookie->id_bouncesegs, 832 cookie->id_nbouncesegs, cookie->id_bouncebuflen, 833 (void **)&cookie->id_bouncebuf, flags); 834 835 out: 836 if (error) { 837 x68k_bus_dmamem_free(t, cookie->id_bouncesegs, 838 cookie->id_nbouncesegs); 839 cookie->id_bouncebuflen = 0; 840 cookie->id_nbouncesegs = 0; 841 } else { 842 cookie->id_flags |= ID_HAS_BOUNCE; 843 } 844 845 return (error); 846 } 847 848 void 849 _intio_dma_free_bouncebuf(bus_dma_tag_t t, bus_dmamap_t map) 850 { 851 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 852 853 x68k_bus_dmamem_unmap(t, cookie->id_bouncebuf, 854 cookie->id_bouncebuflen); 855 x68k_bus_dmamem_free(t, cookie->id_bouncesegs, 856 cookie->id_nbouncesegs); 857 cookie->id_bouncebuflen = 0; 858 cookie->id_nbouncesegs = 0; 859 cookie->id_flags &= ~ID_HAS_BOUNCE; 860 } 861
Indexes created Sun Sep 21 16:09:51 GMT 2025