1 /* $NetBSD: intio.c,v 1.52 2022/05/26 14:33:29 tsutsui 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 1.52 2022/05/26 14:33:29 tsutsui 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 #include "ioconf.h" 51 52 /* 53 * bus_space(9) interface 54 */ 55 static int intio_bus_space_map(bus_space_tag_t, bus_addr_t, bus_size_t, int, bus_space_handle_t *); 56 static void intio_bus_space_unmap(bus_space_tag_t, bus_space_handle_t, bus_size_t); 57 static int intio_bus_space_subregion(bus_space_tag_t, bus_space_handle_t, bus_size_t, bus_size_t, bus_space_handle_t *); 58 59 static struct x68k_bus_space intio_bus = { 60 #if 0 61 X68K_INTIO_BUS, 62 #endif 63 intio_bus_space_map, intio_bus_space_unmap, intio_bus_space_subregion, 64 x68k_bus_space_alloc, x68k_bus_space_free, 65 #if 0 66 x68k_bus_space_barrier, 67 #endif 68 69 0 70 }; 71 72 /* 73 * bus_dma(9) interface 74 */ 75 #define INTIO_DMA_BOUNCE_THRESHOLD (16 * 1024 * 1024) 76 int _intio_bus_dmamap_create(bus_dma_tag_t, bus_size_t, int, 77 bus_size_t, bus_size_t, int, bus_dmamap_t *); 78 void _intio_bus_dmamap_destroy(bus_dma_tag_t, bus_dmamap_t); 79 int _intio_bus_dmamap_load(bus_dma_tag_t, bus_dmamap_t, void *, 80 bus_size_t, struct proc *, int); 81 int _intio_bus_dmamap_load_mbuf(bus_dma_tag_t, bus_dmamap_t, 82 struct mbuf *, int); 83 int _intio_bus_dmamap_load_uio(bus_dma_tag_t, bus_dmamap_t, 84 struct uio *, int); 85 int _intio_bus_dmamap_load_raw(bus_dma_tag_t, bus_dmamap_t, 86 bus_dma_segment_t *, int, bus_size_t, int); 87 void _intio_bus_dmamap_unload(bus_dma_tag_t, bus_dmamap_t); 88 void _intio_bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, 89 bus_addr_t, bus_size_t, int); 90 91 int _intio_bus_dmamem_alloc(bus_dma_tag_t, bus_size_t, bus_size_t, 92 bus_size_t, bus_dma_segment_t *, int, int *, int); 93 94 int _intio_dma_alloc_bouncebuf(bus_dma_tag_t, bus_dmamap_t, 95 bus_size_t, int); 96 void _intio_dma_free_bouncebuf(bus_dma_tag_t, bus_dmamap_t); 97 98 struct x68k_bus_dma intio_bus_dma = { 99 INTIO_DMA_BOUNCE_THRESHOLD, 100 _intio_bus_dmamap_create, 101 _intio_bus_dmamap_destroy, 102 _intio_bus_dmamap_load, 103 _intio_bus_dmamap_load_mbuf, 104 _intio_bus_dmamap_load_uio, 105 _intio_bus_dmamap_load_raw, 106 _intio_bus_dmamap_unload, 107 _intio_bus_dmamap_sync, 108 _intio_bus_dmamem_alloc, 109 x68k_bus_dmamem_free, 110 x68k_bus_dmamem_map, 111 x68k_bus_dmamem_unmap, 112 x68k_bus_dmamem_mmap, 113 }; 114 115 /* 116 * autoconf stuff 117 */ 118 static int intio_match(device_t, cfdata_t, void *); 119 static void intio_attach(device_t, device_t, void *); 120 static int intio_search(device_t, cfdata_t, const int *, void *); 121 static int intio_print(void *, const char *); 122 static void intio_alloc_system_ports(struct intio_softc*); 123 124 CFATTACH_DECL_NEW(intio, sizeof(struct intio_softc), 125 intio_match, intio_attach, NULL, NULL); 126 127 static int intio_attached; 128 129 static struct intio_interrupt_vector { 130 intio_intr_handler_t iiv_handler; 131 void *iiv_arg; 132 struct evcnt *iiv_evcnt; 133 } iiv[256] = {{0,},}; 134 135 #ifdef DEBUG 136 int intio_debug = 0; 137 #endif 138 139 static int 140 intio_match(device_t parent, cfdata_t cf, void *aux) 141 { 142 143 if (strcmp(aux, intio_cd.cd_name) != 0) 144 return (0); 145 if (intio_attached) 146 return (0); 147 148 return (1); 149 } 150 151 static void 152 intio_attach(device_t parent, device_t self, void *aux) 153 { 154 struct intio_softc *sc = device_private(self); 155 struct intio_attach_args ia; 156 157 intio_attached = 1; 158 159 aprint_normal(" mapped at %8p\n", intiobase); 160 161 sc->sc_map = extent_create("intiomap", 162 INTIOBASE, 163 INTIOBASE + 0x400000, 164 NULL, 0, EX_WAITOK); 165 intio_alloc_system_ports(sc); 166 167 sc->sc_bst = &intio_bus; 168 sc->sc_bst->x68k_bus_device = self; 169 sc->sc_dmat = &intio_bus_dma; 170 sc->sc_dmac = 0; 171 172 memset(iiv, 0, sizeof(struct intio_interrupt_vector) * 256); 173 174 ia.ia_bst = sc->sc_bst; 175 ia.ia_dmat = sc->sc_dmat; 176 177 config_search(self, &ia, 178 CFARGS(.search = intio_search)); 179 } 180 181 static int 182 intio_search(device_t parent, cfdata_t cf, const int *ldesc, void *aux) 183 { 184 struct intio_softc *sc = device_private(parent); 185 struct intio_attach_args *ia = aux; 186 187 ia->ia_bst = sc->sc_bst; 188 ia->ia_dmat = sc->sc_dmat; 189 ia->ia_name = cf->cf_name; 190 ia->ia_addr = cf->cf_addr; 191 ia->ia_intr = cf->cf_intr; 192 ia->ia_dma = cf->cf_dma; 193 ia->ia_dmaintr = cf->cf_dmaintr; 194 195 if (config_probe(parent, cf, ia)) 196 config_attach(parent, cf, ia, intio_print, CFARGS_NONE); 197 198 return (0); 199 } 200 201 static int 202 intio_print(void *aux, const char *name) 203 { 204 struct intio_attach_args *ia = aux; 205 206 /* if (ia->ia_addr > 0) */ 207 aprint_normal(" addr 0x%06x", ia->ia_addr); 208 if (ia->ia_intr > 0) 209 aprint_normal(" intr 0x%02x", ia->ia_intr); 210 if (ia->ia_dma >= 0) { 211 aprint_normal(" using DMA ch%d", ia->ia_dma); 212 if (ia->ia_dmaintr > 0) 213 aprint_normal(" intr 0x%02x and 0x%02x", 214 ia->ia_dmaintr, ia->ia_dmaintr+1); 215 } 216 217 return (QUIET); 218 } 219 220 /* 221 * intio memory map manager 222 */ 223 224 int 225 intio_map_allocate_region(device_t parent, struct intio_attach_args *ia, 226 enum intio_map_flag flag) 227 { 228 struct intio_softc *sc = device_private(parent); 229 struct extent *map = sc->sc_map; 230 int r; 231 232 r = extent_alloc_region(map, ia->ia_addr, ia->ia_size, 0); 233 #ifdef DEBUG 234 if (intio_debug) 235 extent_print(map); 236 #endif 237 if (r == 0) { 238 if (flag != INTIO_MAP_ALLOCATE) 239 extent_free(map, ia->ia_addr, ia->ia_size, 0); 240 return 0; 241 } 242 243 return -1; 244 } 245 246 int 247 intio_map_free_region(device_t parent, struct intio_attach_args *ia) 248 { 249 struct intio_softc *sc = device_private(parent); 250 struct extent *map = sc->sc_map; 251 252 extent_free(map, ia->ia_addr, ia->ia_size, 0); 253 #ifdef DEBUG 254 if (intio_debug) 255 extent_print(map); 256 #endif 257 return 0; 258 } 259 260 void 261 intio_alloc_system_ports(struct intio_softc *sc) 262 { 263 extent_alloc_region(sc->sc_map, INTIO_SYSPORT, 16, 0); 264 extent_alloc_region(sc->sc_map, INTIO_SICILIAN, 0x2000, 0); 265 } 266 267 268 /* 269 * intio bus space stuff. 270 */ 271 static int 272 intio_bus_space_map(bus_space_tag_t t, bus_addr_t bpa, bus_size_t size, 273 int flags, bus_space_handle_t *bshp) 274 { 275 /* 276 * Intio bus is mapped permanently. 277 */ 278 *bshp = (bus_space_handle_t)IIOV(bpa); 279 280 /* 281 * Some devices are mapped on odd or even addresses only. 282 */ 283 if ((flags & BUS_SPACE_MAP_SHIFTED_MASK) == BUS_SPACE_MAP_SHIFTED_ODD) 284 *bshp += 0x80000001; 285 if ((flags & BUS_SPACE_MAP_SHIFTED_MASK) == BUS_SPACE_MAP_SHIFTED_EVEN) 286 *bshp += 0x80000000; 287 288 return (0); 289 } 290 291 static void 292 intio_bus_space_unmap(bus_space_tag_t t, bus_space_handle_t bsh, 293 bus_size_t size) 294 { 295 return; 296 } 297 298 static int 299 intio_bus_space_subregion(bus_space_tag_t t, bus_space_handle_t bsh, 300 bus_size_t offset, bus_size_t size, bus_space_handle_t *nbshp) 301 { 302 303 *nbshp = bsh + offset; 304 return (0); 305 } 306 307 308 /* 309 * interrupt handler 310 */ 311 int 312 intio_intr_establish(int vector, const char *name, intio_intr_handler_t handler, 313 void *arg) 314 { 315 316 return intio_intr_establish_ext(vector, name, "intr", handler, arg); 317 } 318 319 int 320 intio_intr_establish_ext(int vector, const char *name1, const char *name2, 321 intio_intr_handler_t handler, void *arg) 322 { 323 struct evcnt *evcnt; 324 325 if (vector < 16) 326 panic("Invalid interrupt vector"); 327 if (iiv[vector].iiv_handler) 328 return EBUSY; 329 330 evcnt = malloc(sizeof(*evcnt), M_DEVBUF, M_WAITOK); 331 evcnt_attach_dynamic(evcnt, EVCNT_TYPE_INTR, NULL, name1, name2); 332 333 iiv[vector].iiv_handler = handler; 334 iiv[vector].iiv_arg = arg; 335 iiv[vector].iiv_evcnt = evcnt; 336 337 return 0; 338 } 339 340 int 341 intio_intr_disestablish(int vector, void *arg) 342 { 343 if (iiv[vector].iiv_handler == 0 || iiv[vector].iiv_arg != arg) 344 return EINVAL; 345 iiv[vector].iiv_handler = 0; 346 iiv[vector].iiv_arg = 0; 347 evcnt_detach(iiv[vector].iiv_evcnt); 348 free(iiv[vector].iiv_evcnt, M_DEVBUF); 349 350 return 0; 351 } 352 353 int 354 intio_intr(struct frame *frame) 355 { 356 int vector = frame->f_vector / 4; 357 358 if (iiv[vector].iiv_handler == 0) { 359 printf("Stray interrupt: %d type %x, pc %x\n", 360 vector, frame->f_format, frame->f_pc); 361 return 0; 362 } 363 364 iiv[vector].iiv_evcnt->ev_count++; 365 366 return (*(iiv[vector].iiv_handler))(iiv[vector].iiv_arg); 367 } 368 369 /* 370 * Intio I/O controller interrupt 371 */ 372 static u_int8_t intio_ivec = 0; 373 374 void 375 intio_set_ivec(int vec) 376 { 377 vec &= 0xfc; 378 379 if (intio_ivec && intio_ivec != (vec & 0xfc)) 380 panic("Wrong interrupt vector for Sicilian."); 381 382 intio_ivec = vec; 383 intio_set_sicilian_ivec(vec); 384 } 385 386 387 /* 388 * intio bus DMA stuff. stolen from arch/i386/isa/isa_machdep.c 389 */ 390 391 /* 392 * Create an INTIO DMA map. 393 */ 394 int 395 _intio_bus_dmamap_create(bus_dma_tag_t t, bus_size_t size, int nsegments, 396 bus_size_t maxsegsz, bus_size_t boundary, int flags, bus_dmamap_t *dmamp) 397 { 398 struct intio_dma_cookie *cookie; 399 bus_dmamap_t map; 400 int error, cookieflags; 401 size_t cookiesize; 402 extern paddr_t avail_end; 403 404 /* Call common function to create the basic map. */ 405 error = x68k_bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, 406 flags, dmamp); 407 if (error) 408 return (error); 409 410 map = *dmamp; 411 map->x68k_dm_cookie = NULL; 412 413 cookiesize = sizeof(struct intio_dma_cookie); 414 415 /* 416 * INTIO only has 24-bits of address space. This means 417 * we can't DMA to pages over 16M. In order to DMA to 418 * arbitrary buffers, we use "bounce buffers" - pages 419 * in memory below the 16M boundary. On DMA reads, 420 * DMA happens to the bounce buffers, and is copied into 421 * the caller's buffer. On writes, data is copied into 422 * the bounce buffer, and the DMA happens from those 423 * pages. To software using the DMA mapping interface, 424 * this looks simply like a data cache. 425 * 426 * If we have more than 16M of RAM in the system, we may 427 * need bounce buffers. We check and remember that here. 428 * 429 * ...or, there is an opposite case. The most segments 430 * a transfer will require is (maxxfer / PAGE_SIZE) + 1. If 431 * the caller can't handle that many segments (e.g. the 432 * DMAC), we may have to bounce it as well. 433 */ 434 if (avail_end <= t->_bounce_thresh) 435 /* Bouncing not necessary due to memory size. */ 436 map->x68k_dm_bounce_thresh = 0; 437 cookieflags = 0; 438 if (map->x68k_dm_bounce_thresh != 0 || 439 ((map->x68k_dm_size / PAGE_SIZE) + 1) > map->x68k_dm_segcnt) { 440 cookieflags |= ID_MIGHT_NEED_BOUNCE; 441 cookiesize += (sizeof(bus_dma_segment_t) * map->x68k_dm_segcnt); 442 } 443 444 /* 445 * Allocate our cookie. 446 */ 447 cookie = malloc(cookiesize, M_DMAMAP, 448 ((flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK) | M_ZERO); 449 if (cookie == NULL) { 450 error = ENOMEM; 451 goto out; 452 } 453 cookie->id_flags = cookieflags; 454 map->x68k_dm_cookie = cookie; 455 456 if (cookieflags & ID_MIGHT_NEED_BOUNCE) { 457 /* 458 * Allocate the bounce pages now if the caller 459 * wishes us to do so. 460 */ 461 if ((flags & BUS_DMA_ALLOCNOW) == 0) 462 goto out; 463 464 error = _intio_dma_alloc_bouncebuf(t, map, size, flags); 465 } 466 467 out: 468 if (error) { 469 if (map->x68k_dm_cookie != NULL) 470 free(map->x68k_dm_cookie, M_DMAMAP); 471 x68k_bus_dmamap_destroy(t, map); 472 } 473 return (error); 474 } 475 476 /* 477 * Destroy an INTIO DMA map. 478 */ 479 void 480 _intio_bus_dmamap_destroy(bus_dma_tag_t t, bus_dmamap_t map) 481 { 482 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 483 484 /* 485 * Free any bounce pages this map might hold. 486 */ 487 if (cookie->id_flags & ID_HAS_BOUNCE) 488 _intio_dma_free_bouncebuf(t, map); 489 490 free(cookie, M_DMAMAP); 491 x68k_bus_dmamap_destroy(t, map); 492 } 493 494 /* 495 * Load an INTIO DMA map with a linear buffer. 496 */ 497 int 498 _intio_bus_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map, void *buf, 499 bus_size_t buflen, struct proc *p, int flags) 500 { 501 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 502 int error; 503 504 /* 505 * Make sure that on error condition we return "no valid mappings." 506 */ 507 map->dm_mapsize = 0; 508 map->dm_nsegs = 0; 509 510 /* 511 * Try to load the map the normal way. If this errors out, 512 * and we can bounce, we will. 513 */ 514 error = x68k_bus_dmamap_load(t, map, buf, buflen, p, flags); 515 if (error == 0 || (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0) 516 return (error); 517 518 /* 519 * Allocate bounce pages, if necessary. 520 */ 521 if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) { 522 error = _intio_dma_alloc_bouncebuf(t, map, buflen, flags); 523 if (error) 524 return (error); 525 } 526 527 /* 528 * Cache a pointer to the caller's buffer and load the DMA map 529 * with the bounce buffer. 530 */ 531 cookie->id_origbuf = buf; 532 cookie->id_origbuflen = buflen; 533 cookie->id_buftype = ID_BUFTYPE_LINEAR; 534 error = x68k_bus_dmamap_load(t, map, cookie->id_bouncebuf, buflen, 535 p, flags); 536 if (error) { 537 /* 538 * Free the bounce pages, unless our resources 539 * are reserved for our exclusive use. 540 */ 541 if ((map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 542 _intio_dma_free_bouncebuf(t, map); 543 return (error); 544 } 545 546 /* ...so _intio_bus_dmamap_sync() knows we're bouncing */ 547 cookie->id_flags |= ID_IS_BOUNCING; 548 return (0); 549 } 550 551 /* 552 * Like _intio_bus_dmamap_load(), but for mbufs. 553 */ 554 int 555 _intio_bus_dmamap_load_mbuf(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m0, 556 int flags) 557 { 558 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 559 int error; 560 561 /* 562 * Make sure on error condition we return "no valid mappings." 563 */ 564 map->dm_mapsize = 0; 565 map->dm_nsegs = 0; 566 567 #ifdef DIAGNOSTIC 568 if ((m0->m_flags & M_PKTHDR) == 0) 569 panic("_intio_bus_dmamap_load_mbuf: no packet header"); 570 #endif 571 572 if (m0->m_pkthdr.len > map->x68k_dm_size) 573 return (EINVAL); 574 575 /* 576 * Try to load the map the normal way. If this errors out, 577 * and we can bounce, we will. 578 */ 579 error = x68k_bus_dmamap_load_mbuf(t, map, m0, flags); 580 if (error == 0 || (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0) 581 return (error); 582 583 /* 584 * Allocate bounce pages, if necessary. 585 */ 586 if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) { 587 error = _intio_dma_alloc_bouncebuf(t, map, m0->m_pkthdr.len, 588 flags); 589 if (error) 590 return (error); 591 } 592 593 /* 594 * Cache a pointer to the caller's buffer and load the DMA map 595 * with the bounce buffer. 596 */ 597 cookie->id_origbuf = m0; 598 cookie->id_origbuflen = m0->m_pkthdr.len; /* not really used */ 599 cookie->id_buftype = ID_BUFTYPE_MBUF; 600 error = x68k_bus_dmamap_load(t, map, cookie->id_bouncebuf, 601 m0->m_pkthdr.len, NULL, flags); 602 if (error) { 603 /* 604 * Free the bounce pages, unless our resources 605 * are reserved for our exclusive use. 606 */ 607 if ((map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 608 _intio_dma_free_bouncebuf(t, map); 609 return (error); 610 } 611 612 /* ...so _intio_bus_dmamap_sync() knows we're bouncing */ 613 cookie->id_flags |= ID_IS_BOUNCING; 614 return (0); 615 } 616 617 /* 618 * Like _intio_bus_dmamap_load(), but for uios. 619 */ 620 int 621 _intio_bus_dmamap_load_uio(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio, 622 int flags) 623 { 624 panic("_intio_bus_dmamap_load_uio: not implemented"); 625 } 626 627 /* 628 * Like _intio_bus_dmamap_load(), but for raw memory allocated with 629 * bus_dmamem_alloc(). 630 */ 631 int 632 _intio_bus_dmamap_load_raw(bus_dma_tag_t t, bus_dmamap_t map, 633 bus_dma_segment_t *segs, int nsegs, bus_size_t size, int flags) 634 { 635 636 panic("_intio_bus_dmamap_load_raw: not implemented"); 637 } 638 639 /* 640 * Unload an INTIO DMA map. 641 */ 642 void 643 _intio_bus_dmamap_unload(bus_dma_tag_t t, bus_dmamap_t map) 644 { 645 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 646 647 /* 648 * If we have bounce pages, free them, unless they're 649 * reserved for our exclusive use. 650 */ 651 if ((cookie->id_flags & ID_HAS_BOUNCE) && 652 (map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 653 _intio_dma_free_bouncebuf(t, map); 654 655 cookie->id_flags &= ~ID_IS_BOUNCING; 656 cookie->id_buftype = ID_BUFTYPE_INVALID; 657 658 /* 659 * Do the generic bits of the unload. 660 */ 661 x68k_bus_dmamap_unload(t, map); 662 } 663 664 /* 665 * Synchronize an INTIO DMA map. 666 */ 667 void 668 _intio_bus_dmamap_sync(bus_dma_tag_t t, bus_dmamap_t map, bus_addr_t offset, 669 bus_size_t len, int ops) 670 { 671 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 672 673 /* 674 * Mixing PRE and POST operations is not allowed. 675 */ 676 if ((ops & (BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE)) != 0 && 677 (ops & (BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE)) != 0) 678 panic("_intio_bus_dmamap_sync: mix PRE and POST"); 679 680 #ifdef DIAGNOSTIC 681 if ((ops & (BUS_DMASYNC_PREWRITE|BUS_DMASYNC_POSTREAD)) != 0) { 682 if (offset >= map->dm_mapsize) 683 panic("_intio_bus_dmamap_sync: bad offset"); 684 if (len == 0 || (offset + len) > map->dm_mapsize) 685 panic("_intio_bus_dmamap_sync: bad length"); 686 } 687 #endif 688 689 /* 690 * If we're not bouncing, just return; nothing to do. 691 */ 692 if ((cookie->id_flags & ID_IS_BOUNCING) == 0) 693 return; 694 695 switch (cookie->id_buftype) { 696 case ID_BUFTYPE_LINEAR: 697 /* 698 * Nothing to do for pre-read. 699 */ 700 701 if (ops & BUS_DMASYNC_PREWRITE) { 702 /* 703 * Copy the caller's buffer to the bounce buffer. 704 */ 705 memcpy((char *)cookie->id_bouncebuf + offset, 706 (char *)cookie->id_origbuf + offset, len); 707 } 708 709 if (ops & BUS_DMASYNC_POSTREAD) { 710 /* 711 * Copy the bounce buffer to the caller's buffer. 712 */ 713 memcpy((char *)cookie->id_origbuf + offset, 714 (char *)cookie->id_bouncebuf + offset, len); 715 } 716 717 /* 718 * Nothing to do for post-write. 719 */ 720 break; 721 722 case ID_BUFTYPE_MBUF: 723 { 724 struct mbuf *m, *m0 = cookie->id_origbuf; 725 bus_size_t minlen, moff; 726 727 /* 728 * Nothing to do for pre-read. 729 */ 730 731 if (ops & BUS_DMASYNC_PREWRITE) { 732 /* 733 * Copy the caller's buffer to the bounce buffer. 734 */ 735 m_copydata(m0, offset, len, 736 (char *)cookie->id_bouncebuf + offset); 737 } 738 739 if (ops & BUS_DMASYNC_POSTREAD) { 740 /* 741 * Copy the bounce buffer to the caller's buffer. 742 */ 743 for (moff = offset, m = m0; m != NULL && len != 0; 744 m = m->m_next) { 745 /* Find the beginning mbuf. */ 746 if (moff >= m->m_len) { 747 moff -= m->m_len; 748 continue; 749 } 750 751 /* 752 * Now at the first mbuf to sync; nail 753 * each one until we have exhausted the 754 * length. 755 */ 756 minlen = len < m->m_len - moff ? 757 len : m->m_len - moff; 758 759 memcpy(mtod(m, char *) + moff, 760 (char *)cookie->id_bouncebuf + offset, 761 minlen); 762 763 moff = 0; 764 len -= minlen; 765 offset += minlen; 766 } 767 } 768 769 /* 770 * Nothing to do for post-write. 771 */ 772 break; 773 } 774 775 case ID_BUFTYPE_UIO: 776 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_UIO"); 777 break; 778 779 case ID_BUFTYPE_RAW: 780 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_RAW"); 781 break; 782 783 case ID_BUFTYPE_INVALID: 784 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_INVALID"); 785 break; 786 787 default: 788 printf("unknown buffer type %d\n", cookie->id_buftype); 789 panic("_intio_bus_dmamap_sync"); 790 } 791 } 792 793 /* 794 * Allocate memory safe for INTIO DMA. 795 */ 796 int 797 _intio_bus_dmamem_alloc(bus_dma_tag_t t, bus_size_t size, bus_size_t alignment, 798 bus_size_t boundary, bus_dma_segment_t *segs, int nsegs, int *rsegs, 799 int flags) 800 { 801 paddr_t high; 802 extern paddr_t avail_end; 803 804 if (avail_end > INTIO_DMA_BOUNCE_THRESHOLD) 805 high = trunc_page(INTIO_DMA_BOUNCE_THRESHOLD); 806 else 807 high = trunc_page(avail_end); 808 809 return (x68k_bus_dmamem_alloc_range(t, size, alignment, boundary, 810 segs, nsegs, rsegs, flags, 0, high)); 811 } 812 813 /********************************************************************** 814 * INTIO DMA utility functions 815 **********************************************************************/ 816 817 int 818 _intio_dma_alloc_bouncebuf(bus_dma_tag_t t, bus_dmamap_t map, bus_size_t size, 819 int flags) 820 { 821 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 822 int error = 0; 823 824 cookie->id_bouncebuflen = round_page(size); 825 error = _intio_bus_dmamem_alloc(t, cookie->id_bouncebuflen, 826 PAGE_SIZE, map->x68k_dm_boundary, cookie->id_bouncesegs, 827 map->x68k_dm_segcnt, &cookie->id_nbouncesegs, flags); 828 if (error) 829 goto out; 830 error = x68k_bus_dmamem_map(t, cookie->id_bouncesegs, 831 cookie->id_nbouncesegs, cookie->id_bouncebuflen, 832 (void **)&cookie->id_bouncebuf, flags); 833 834 out: 835 if (error) { 836 x68k_bus_dmamem_free(t, cookie->id_bouncesegs, 837 cookie->id_nbouncesegs); 838 cookie->id_bouncebuflen = 0; 839 cookie->id_nbouncesegs = 0; 840 } else { 841 cookie->id_flags |= ID_HAS_BOUNCE; 842 } 843 844 return (error); 845 } 846 847 void 848 _intio_dma_free_bouncebuf(bus_dma_tag_t t, bus_dmamap_t map) 849 { 850 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 851 852 x68k_bus_dmamem_unmap(t, cookie->id_bouncebuf, 853 cookie->id_bouncebuflen); 854 x68k_bus_dmamem_free(t, cookie->id_bouncesegs, 855 cookie->id_nbouncesegs); 856 cookie->id_bouncebuflen = 0; 857 cookie->id_nbouncesegs = 0; 858 cookie->id_flags &= ~ID_HAS_BOUNCE; 859 } 860
Indexes created Sat Sep 20 22:09:52 GMT 2025