intio.c revision 1.25
1 /* $NetBSD: intio.c,v 1.25 2005/01/18 07:12:15 chs Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 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 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the NetBSD 18 * Foundation, Inc. and its contributors. 19 * 4. Neither the name of The NetBSD Foundation nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 27 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /* 37 * NetBSD/x68k internal I/O virtual bus. 38 */ 39 40 #include <sys/cdefs.h> 41 __KERNEL_RCSID(0, "$NetBSD: intio.c,v 1.25 2005/01/18 07:12:15 chs Exp $"); 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/device.h> 46 #include <sys/malloc.h> 47 #include <sys/mbuf.h> 48 #include <sys/extent.h> 49 #include <uvm/uvm_extern.h> 50 51 #include <machine/bus.h> 52 #include <machine/cpu.h> 53 #include <machine/frame.h> 54 55 #include <arch/x68k/dev/intiovar.h> 56 #include <arch/x68k/dev/mfp.h> 57 58 59 /* 60 * bus_space(9) interface 61 */ 62 static int intio_bus_space_map(bus_space_tag_t, bus_addr_t, bus_size_t, int, bus_space_handle_t *); 63 static void intio_bus_space_unmap(bus_space_tag_t, bus_space_handle_t, bus_size_t); 64 static int intio_bus_space_subregion(bus_space_tag_t, bus_space_handle_t, bus_size_t, bus_size_t, bus_space_handle_t *); 65 66 static struct x68k_bus_space intio_bus = { 67 #if 0 68 X68K_INTIO_BUS, 69 #endif 70 intio_bus_space_map, intio_bus_space_unmap, intio_bus_space_subregion, 71 x68k_bus_space_alloc, x68k_bus_space_free, 72 #if 0 73 x68k_bus_space_barrier, 74 #endif 75 76 0 77 }; 78 79 /* 80 * bus_dma(9) interface 81 */ 82 #define INTIO_DMA_BOUNCE_THRESHOLD (16 * 1024 * 1024) 83 int _intio_bus_dmamap_create(bus_dma_tag_t, bus_size_t, int, 84 bus_size_t, bus_size_t, int, bus_dmamap_t *); 85 void _intio_bus_dmamap_destroy(bus_dma_tag_t, bus_dmamap_t); 86 int _intio_bus_dmamap_load(bus_dma_tag_t, bus_dmamap_t, void *, 87 bus_size_t, struct proc *, int); 88 int _intio_bus_dmamap_load_mbuf(bus_dma_tag_t, bus_dmamap_t, 89 struct mbuf *, int); 90 int _intio_bus_dmamap_load_uio(bus_dma_tag_t, bus_dmamap_t, 91 struct uio *, int); 92 int _intio_bus_dmamap_load_raw(bus_dma_tag_t, bus_dmamap_t, 93 bus_dma_segment_t *, int, bus_size_t, int); 94 void _intio_bus_dmamap_unload(bus_dma_tag_t, bus_dmamap_t); 95 void _intio_bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, 96 bus_addr_t, bus_size_t, int); 97 98 int _intio_bus_dmamem_alloc(bus_dma_tag_t, bus_size_t, bus_size_t, 99 bus_size_t, bus_dma_segment_t *, int, int *, int); 100 101 int _intio_dma_alloc_bouncebuf(bus_dma_tag_t, bus_dmamap_t, 102 bus_size_t, int); 103 void _intio_dma_free_bouncebuf(bus_dma_tag_t, bus_dmamap_t); 104 105 struct x68k_bus_dma intio_bus_dma = { 106 INTIO_DMA_BOUNCE_THRESHOLD, 107 _intio_bus_dmamap_create, 108 _intio_bus_dmamap_destroy, 109 _intio_bus_dmamap_load, 110 _intio_bus_dmamap_load_mbuf, 111 _intio_bus_dmamap_load_uio, 112 _intio_bus_dmamap_load_raw, 113 _intio_bus_dmamap_unload, 114 _intio_bus_dmamap_sync, 115 _intio_bus_dmamem_alloc, 116 x68k_bus_dmamem_free, 117 x68k_bus_dmamem_map, 118 x68k_bus_dmamem_unmap, 119 x68k_bus_dmamem_mmap, 120 }; 121 122 /* 123 * autoconf stuff 124 */ 125 static int intio_match(struct device *, struct cfdata *, void *); 126 static void intio_attach(struct device *, struct device *, void *); 127 static int intio_search(struct device *, struct cfdata *cf, void *); 128 static int intio_print(void *, const char *); 129 static void intio_alloc_system_ports(struct intio_softc*); 130 131 CFATTACH_DECL(intio, sizeof(struct intio_softc), 132 intio_match, intio_attach, NULL, NULL); 133 134 extern struct cfdriver intio_cd; 135 136 static int intio_attached; 137 138 static struct intio_interrupt_vector { 139 intio_intr_handler_t iiv_handler; 140 void *iiv_arg; 141 int iiv_intrcntoff; 142 } iiv[256] = {{0,},}; 143 144 /* used in console initialization */ 145 extern int x68k_realconfig; 146 int x68k_config_found(struct cfdata *, struct device *, void *, cfprint_t); 147 static struct cfdata *cfdata_intiobus = NULL; 148 149 /* other static functions */ 150 static int scan_intrnames(const char *); 151 #ifdef DEBUG 152 int intio_debug = 0; 153 #endif 154 155 static int 156 intio_match(struct device *parent, struct cfdata *cf, void *aux) 157 { 158 159 if (strcmp(aux, intio_cd.cd_name) != 0) 160 return (0); 161 if (intio_attached) 162 return (0); 163 if (x68k_realconfig == 0) 164 cfdata_intiobus = cf; /* XXX */ 165 166 return (1); 167 } 168 169 170 /* used in console initialization: configure only MFP */ 171 static struct intio_attach_args initial_ia = { 172 &intio_bus, 173 0/*XXX*/, 174 175 "mfp", /* ia_name */ 176 MFP_ADDR, /* ia_addr */ 177 0x30, /* ia_size */ 178 MFP_INTR, /* ia_intr */ 179 -1 /* ia_dma */ 180 -1, /* ia_dmaintr */ 181 }; 182 183 static void 184 intio_attach(struct device *parent, struct device *self, void *aux) 185 { 186 struct intio_softc *sc = (struct intio_softc *)self; 187 struct intio_attach_args ia; 188 189 if (self == NULL) { 190 /* console only init */ 191 x68k_config_found(cfdata_intiobus, NULL, &initial_ia, NULL); 192 return; 193 } 194 195 intio_attached = 1; 196 197 printf (" mapped at %8p\n", intiobase); 198 199 sc->sc_map = extent_create("intiomap", 200 PHYS_INTIODEV, 201 PHYS_INTIODEV + 0x400000, 202 M_DEVBUF, NULL, 0, EX_NOWAIT); 203 intio_alloc_system_ports(sc); 204 205 sc->sc_bst = &intio_bus; 206 sc->sc_bst->x68k_bus_device = self; 207 sc->sc_dmat = &intio_bus_dma; 208 sc->sc_dmac = 0; 209 210 memset(iiv, 0, sizeof (struct intio_interrupt_vector) * 256); 211 212 ia.ia_bst = sc->sc_bst; 213 ia.ia_dmat = sc->sc_dmat; 214 215 config_search(intio_search, self, &ia); 216 } 217 218 static int 219 intio_search(struct device *parent, struct cfdata *cf, void *aux) 220 { 221 struct intio_attach_args *ia = aux; 222 struct intio_softc *sc = (struct intio_softc *)parent; 223 224 ia->ia_bst = sc->sc_bst; 225 ia->ia_dmat = sc->sc_dmat; 226 ia->ia_name = cf->cf_name; 227 ia->ia_addr = cf->cf_addr; 228 ia->ia_intr = cf->cf_intr; 229 ia->ia_dma = cf->cf_dma; 230 ia->ia_dmaintr = cf->cf_dmaintr; 231 232 if (config_match(parent, cf, ia) > 0) 233 config_attach(parent, cf, ia, intio_print); 234 235 return (0); 236 } 237 238 static int 239 intio_print(void *aux, const char *name) 240 { 241 struct intio_attach_args *ia = aux; 242 243 /* if (ia->ia_addr > 0) */ 244 aprint_normal (" addr 0x%06x", ia->ia_addr); 245 if (ia->ia_intr > 0) 246 aprint_normal (" intr 0x%02x", ia->ia_intr); 247 if (ia->ia_dma >= 0) { 248 aprint_normal (" using DMA ch%d", ia->ia_dma); 249 if (ia->ia_dmaintr > 0) 250 aprint_normal (" intr 0x%02x and 0x%02x", 251 ia->ia_dmaintr, ia->ia_dmaintr+1); 252 } 253 254 return (QUIET); 255 } 256 257 /* 258 * intio memory map manager 259 */ 260 261 int 262 intio_map_allocate_region(struct device *parent, struct intio_attach_args *ia, 263 enum intio_map_flag flag) 264 { 265 struct intio_softc *sc = (struct intio_softc *)parent; 266 struct extent *map = sc->sc_map; 267 int r; 268 269 r = extent_alloc_region (map, ia->ia_addr, ia->ia_size, 0); 270 #ifdef DEBUG 271 if (intio_debug) 272 extent_print (map); 273 #endif 274 if (r == 0) { 275 if (flag != INTIO_MAP_ALLOCATE) 276 extent_free (map, ia->ia_addr, ia->ia_size, 0); 277 return 0; 278 } 279 280 return -1; 281 } 282 283 int 284 intio_map_free_region(struct device *parent, struct intio_attach_args *ia) 285 { 286 struct intio_softc *sc = (struct intio_softc*) parent; 287 struct extent *map = sc->sc_map; 288 289 extent_free (map, ia->ia_addr, ia->ia_size, 0); 290 #ifdef DEBUG 291 if (intio_debug) 292 extent_print (map); 293 #endif 294 return 0; 295 } 296 297 void 298 intio_alloc_system_ports(struct intio_softc *sc) 299 { 300 extent_alloc_region (sc->sc_map, INTIO_SYSPORT, 16, 0); 301 extent_alloc_region (sc->sc_map, INTIO_SICILIAN, 0x2000, 0); 302 } 303 304 305 /* 306 * intio bus space stuff. 307 */ 308 static int 309 intio_bus_space_map(bus_space_tag_t t, bus_addr_t bpa, bus_size_t size, 310 int flags, bus_space_handle_t *bshp) 311 { 312 /* 313 * Intio bus is mapped permanently. 314 */ 315 *bshp = (bus_space_handle_t) 316 ((u_int) bpa - PHYS_INTIODEV + intiobase); 317 /* 318 * Some devices are mapped on odd or even addresses only. 319 */ 320 if ((flags & BUS_SPACE_MAP_SHIFTED_MASK) == BUS_SPACE_MAP_SHIFTED_ODD) 321 *bshp += 0x80000001; 322 if ((flags & BUS_SPACE_MAP_SHIFTED_MASK) == BUS_SPACE_MAP_SHIFTED_EVEN) 323 *bshp += 0x80000000; 324 325 return (0); 326 } 327 328 static void 329 intio_bus_space_unmap(bus_space_tag_t t, bus_space_handle_t bsh, 330 bus_size_t size) 331 { 332 return; 333 } 334 335 static int 336 intio_bus_space_subregion(bus_space_tag_t t, bus_space_handle_t bsh, 337 bus_size_t offset, bus_size_t size, bus_space_handle_t *nbshp) 338 { 339 340 *nbshp = bsh + offset; 341 return (0); 342 } 343 344 345 /* 346 * interrupt handler 347 */ 348 int 349 intio_intr_establish(int vector, const char *name, intio_intr_handler_t handler, 350 void *arg) 351 { 352 if (vector < 16) 353 panic ("Invalid interrupt vector"); 354 if (iiv[vector].iiv_handler) 355 return EBUSY; 356 iiv[vector].iiv_handler = handler; 357 iiv[vector].iiv_arg = arg; 358 iiv[vector].iiv_intrcntoff = scan_intrnames(name); 359 360 return 0; 361 } 362 363 static int 364 scan_intrnames(const char *name) 365 { 366 extern char intrnames[]; 367 extern char eintrnames[]; 368 int r = 0; 369 char *p = &intrnames[0]; 370 371 for (;;) { 372 if (*p == 0) { /* new intr */ 373 if (p + strlen(name) >= eintrnames) 374 panic ("Interrupt statics buffer overrun."); 375 strcpy (p, name); 376 break; 377 } 378 if (strcmp(p, name) == 0) 379 break; 380 r++; 381 while (*p++ != 0); 382 } 383 384 return r; 385 } 386 387 int 388 intio_intr_disestablish(int vector, void *arg) 389 { 390 if (iiv[vector].iiv_handler == 0 || iiv[vector].iiv_arg != arg) 391 return EINVAL; 392 iiv[vector].iiv_handler = 0; 393 iiv[vector].iiv_arg = 0; 394 395 return 0; 396 } 397 398 int 399 intio_intr(struct frame *frame) 400 { 401 int vector = frame->f_vector / 4; 402 extern int intrcnt[]; 403 404 #if 0 /* this is not correct now */ 405 /* CAUTION: HERE WE ARE IN SPLHIGH() */ 406 /* LOWER TO APPROPRIATE IPL AT VERY FIRST IN THE HANDLER!! */ 407 #endif 408 if (iiv[vector].iiv_handler == 0) { 409 printf ("Stray interrupt: %d type %x, pc %x\n", 410 vector, frame->f_format, frame->f_pc); 411 return 0; 412 } 413 414 intrcnt[iiv[vector].iiv_intrcntoff]++; 415 416 return (*(iiv[vector].iiv_handler)) (iiv[vector].iiv_arg); 417 } 418 419 /* 420 * Intio I/O controller interrupt 421 */ 422 static u_int8_t intio_ivec = 0; 423 424 void 425 intio_set_ivec(int vec) 426 { 427 vec &= 0xfc; 428 429 if (intio_ivec && intio_ivec != (vec & 0xfc)) 430 panic ("Wrong interrupt vector for Sicilian."); 431 432 intio_ivec = vec; 433 intio_set_sicilian_ivec(vec); 434 } 435 436 437 /* 438 * intio bus DMA stuff. stolen from arch/i386/isa/isa_machdep.c 439 */ 440 441 /* 442 * Create an INTIO DMA map. 443 */ 444 int 445 _intio_bus_dmamap_create(bus_dma_tag_t t, bus_size_t size, int nsegments, 446 bus_size_t maxsegsz, bus_size_t boundary, int flags, bus_dmamap_t *dmamp) 447 { 448 struct intio_dma_cookie *cookie; 449 bus_dmamap_t map; 450 int error, cookieflags; 451 void *cookiestore; 452 size_t cookiesize; 453 extern paddr_t avail_end; 454 455 /* Call common function to create the basic map. */ 456 error = x68k_bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, 457 flags, dmamp); 458 if (error) 459 return (error); 460 461 map = *dmamp; 462 map->x68k_dm_cookie = NULL; 463 464 cookiesize = sizeof(struct intio_dma_cookie); 465 466 /* 467 * INTIO only has 24-bits of address space. This means 468 * we can't DMA to pages over 16M. In order to DMA to 469 * arbitrary buffers, we use "bounce buffers" - pages 470 * in memory below the 16M boundary. On DMA reads, 471 * DMA happens to the bounce buffers, and is copied into 472 * the caller's buffer. On writes, data is copied into 473 * but bounce buffer, and the DMA happens from those 474 * pages. To software using the DMA mapping interface, 475 * this looks simply like a data cache. 476 * 477 * If we have more than 16M of RAM in the system, we may 478 * need bounce buffers. We check and remember that here. 479 * 480 * ...or, there is an opposite case. The most segments 481 * a transfer will require is (maxxfer / PAGE_SIZE) + 1. If 482 * the caller can't handle that many segments (e.g. the 483 * DMAC), we may have to bounce it as well. 484 */ 485 if (avail_end <= t->_bounce_thresh) 486 /* Bouncing not necessary due to memory size. */ 487 map->x68k_dm_bounce_thresh = 0; 488 cookieflags = 0; 489 if (map->x68k_dm_bounce_thresh != 0 || 490 ((map->x68k_dm_size / PAGE_SIZE) + 1) > map->x68k_dm_segcnt) { 491 cookieflags |= ID_MIGHT_NEED_BOUNCE; 492 cookiesize += (sizeof(bus_dma_segment_t) * map->x68k_dm_segcnt); 493 } 494 495 /* 496 * Allocate our cookie. 497 */ 498 if ((cookiestore = malloc(cookiesize, M_DMAMAP, 499 (flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK)) == NULL) { 500 error = ENOMEM; 501 goto out; 502 } 503 memset(cookiestore, 0, cookiesize); 504 cookie = (struct intio_dma_cookie *)cookiestore; 505 cookie->id_flags = cookieflags; 506 map->x68k_dm_cookie = cookie; 507 508 if (cookieflags & ID_MIGHT_NEED_BOUNCE) { 509 /* 510 * Allocate the bounce pages now if the caller 511 * wishes us to do so. 512 */ 513 if ((flags & BUS_DMA_ALLOCNOW) == 0) 514 goto out; 515 516 error = _intio_dma_alloc_bouncebuf(t, map, size, flags); 517 } 518 519 out: 520 if (error) { 521 if (map->x68k_dm_cookie != NULL) 522 free(map->x68k_dm_cookie, M_DMAMAP); 523 x68k_bus_dmamap_destroy(t, map); 524 } 525 return (error); 526 } 527 528 /* 529 * Destroy an INTIO DMA map. 530 */ 531 void 532 _intio_bus_dmamap_destroy(bus_dma_tag_t t, bus_dmamap_t map) 533 { 534 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 535 536 /* 537 * Free any bounce pages this map might hold. 538 */ 539 if (cookie->id_flags & ID_HAS_BOUNCE) 540 _intio_dma_free_bouncebuf(t, map); 541 542 free(cookie, M_DMAMAP); 543 x68k_bus_dmamap_destroy(t, map); 544 } 545 546 /* 547 * Load an INTIO DMA map with a linear buffer. 548 */ 549 int 550 _intio_bus_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map, void *buf, 551 bus_size_t buflen, struct proc *p, int flags) 552 { 553 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 554 int error; 555 556 /* 557 * Make sure that on error condition we return "no valid mappings." 558 */ 559 map->dm_mapsize = 0; 560 map->dm_nsegs = 0; 561 562 /* 563 * Try to load the map the normal way. If this errors out, 564 * and we can bounce, we will. 565 */ 566 error = x68k_bus_dmamap_load(t, map, buf, buflen, p, flags); 567 if (error == 0 || 568 (error != 0 && (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0)) 569 return (error); 570 571 /* 572 * Allocate bounce pages, if necessary. 573 */ 574 if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) { 575 error = _intio_dma_alloc_bouncebuf(t, map, buflen, flags); 576 if (error) 577 return (error); 578 } 579 580 /* 581 * Cache a pointer to the caller's buffer and load the DMA map 582 * with the bounce buffer. 583 */ 584 cookie->id_origbuf = buf; 585 cookie->id_origbuflen = buflen; 586 cookie->id_buftype = ID_BUFTYPE_LINEAR; 587 error = x68k_bus_dmamap_load(t, map, cookie->id_bouncebuf, buflen, 588 p, flags); 589 if (error) { 590 /* 591 * Free the bounce pages, unless our resources 592 * are reserved for our exclusive use. 593 */ 594 if ((map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 595 _intio_dma_free_bouncebuf(t, map); 596 return (error); 597 } 598 599 /* ...so _intio_bus_dmamap_sync() knows we're bouncing */ 600 cookie->id_flags |= ID_IS_BOUNCING; 601 return (0); 602 } 603 604 /* 605 * Like _intio_bus_dmamap_load(), but for mbufs. 606 */ 607 int 608 _intio_bus_dmamap_load_mbuf(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m0, 609 int flags) 610 { 611 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 612 int error; 613 614 /* 615 * Make sure on error condition we return "no valid mappings." 616 */ 617 map->dm_mapsize = 0; 618 map->dm_nsegs = 0; 619 620 #ifdef DIAGNOSTIC 621 if ((m0->m_flags & M_PKTHDR) == 0) 622 panic("_intio_bus_dmamap_load_mbuf: no packet header"); 623 #endif 624 625 if (m0->m_pkthdr.len > map->x68k_dm_size) 626 return (EINVAL); 627 628 /* 629 * Try to load the map the normal way. If this errors out, 630 * and we can bounce, we will. 631 */ 632 error = x68k_bus_dmamap_load_mbuf(t, map, m0, flags); 633 if (error == 0 || 634 (error != 0 && (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0)) 635 return (error); 636 637 /* 638 * Allocate bounce pages, if necessary. 639 */ 640 if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) { 641 error = _intio_dma_alloc_bouncebuf(t, map, m0->m_pkthdr.len, 642 flags); 643 if (error) 644 return (error); 645 } 646 647 /* 648 * Cache a pointer to the caller's buffer and load the DMA map 649 * with the bounce buffer. 650 */ 651 cookie->id_origbuf = m0; 652 cookie->id_origbuflen = m0->m_pkthdr.len; /* not really used */ 653 cookie->id_buftype = ID_BUFTYPE_MBUF; 654 error = x68k_bus_dmamap_load(t, map, cookie->id_bouncebuf, 655 m0->m_pkthdr.len, NULL, flags); 656 if (error) { 657 /* 658 * Free the bounce pages, unless our resources 659 * are reserved for our exclusive use. 660 */ 661 if ((map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 662 _intio_dma_free_bouncebuf(t, map); 663 return (error); 664 } 665 666 /* ...so _intio_bus_dmamap_sync() knows we're bouncing */ 667 cookie->id_flags |= ID_IS_BOUNCING; 668 return (0); 669 } 670 671 /* 672 * Like _intio_bus_dmamap_load(), but for uios. 673 */ 674 int 675 _intio_bus_dmamap_load_uio(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio, 676 int flags) 677 { 678 panic("_intio_bus_dmamap_load_uio: not implemented"); 679 } 680 681 /* 682 * Like _intio_bus_dmamap_load(), but for raw memory allocated with 683 * bus_dmamem_alloc(). 684 */ 685 int 686 _intio_bus_dmamap_load_raw(bus_dma_tag_t t, bus_dmamap_t map, 687 bus_dma_segment_t *segs, int nsegs, bus_size_t size, int flags) 688 { 689 690 panic("_intio_bus_dmamap_load_raw: not implemented"); 691 } 692 693 /* 694 * Unload an INTIO DMA map. 695 */ 696 void 697 _intio_bus_dmamap_unload(bus_dma_tag_t t, bus_dmamap_t map) 698 { 699 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 700 701 /* 702 * If we have bounce pages, free them, unless they're 703 * reserved for our exclusive use. 704 */ 705 if ((cookie->id_flags & ID_HAS_BOUNCE) && 706 (map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0) 707 _intio_dma_free_bouncebuf(t, map); 708 709 cookie->id_flags &= ~ID_IS_BOUNCING; 710 cookie->id_buftype = ID_BUFTYPE_INVALID; 711 712 /* 713 * Do the generic bits of the unload. 714 */ 715 x68k_bus_dmamap_unload(t, map); 716 } 717 718 /* 719 * Synchronize an INTIO DMA map. 720 */ 721 void 722 _intio_bus_dmamap_sync(bus_dma_tag_t t, bus_dmamap_t map, bus_addr_t offset, 723 bus_size_t len, int ops) 724 { 725 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 726 727 /* 728 * Mixing PRE and POST operations is not allowed. 729 */ 730 if ((ops & (BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE)) != 0 && 731 (ops & (BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE)) != 0) 732 panic("_intio_bus_dmamap_sync: mix PRE and POST"); 733 734 #ifdef DIAGNOSTIC 735 if ((ops & (BUS_DMASYNC_PREWRITE|BUS_DMASYNC_POSTREAD)) != 0) { 736 if (offset >= map->dm_mapsize) 737 panic("_intio_bus_dmamap_sync: bad offset"); 738 if (len == 0 || (offset + len) > map->dm_mapsize) 739 panic("_intio_bus_dmamap_sync: bad length"); 740 } 741 #endif 742 743 /* 744 * If we're not bouncing, just return; nothing to do. 745 */ 746 if ((cookie->id_flags & ID_IS_BOUNCING) == 0) 747 return; 748 749 switch (cookie->id_buftype) { 750 case ID_BUFTYPE_LINEAR: 751 /* 752 * Nothing to do for pre-read. 753 */ 754 755 if (ops & BUS_DMASYNC_PREWRITE) { 756 /* 757 * Copy the caller's buffer to the bounce buffer. 758 */ 759 memcpy((char *)cookie->id_bouncebuf + offset, 760 (char *)cookie->id_origbuf + offset, len); 761 } 762 763 if (ops & BUS_DMASYNC_POSTREAD) { 764 /* 765 * Copy the bounce buffer to the caller's buffer. 766 */ 767 memcpy((char *)cookie->id_origbuf + offset, 768 (char *)cookie->id_bouncebuf + offset, len); 769 } 770 771 /* 772 * Nothing to do for post-write. 773 */ 774 break; 775 776 case ID_BUFTYPE_MBUF: 777 { 778 struct mbuf *m, *m0 = cookie->id_origbuf; 779 bus_size_t minlen, moff; 780 781 /* 782 * Nothing to do for pre-read. 783 */ 784 785 if (ops & BUS_DMASYNC_PREWRITE) { 786 /* 787 * Copy the caller's buffer to the bounce buffer. 788 */ 789 m_copydata(m0, offset, len, 790 (char *)cookie->id_bouncebuf + offset); 791 } 792 793 if (ops & BUS_DMASYNC_POSTREAD) { 794 /* 795 * Copy the bounce buffer to the caller's buffer. 796 */ 797 for (moff = offset, m = m0; m != NULL && len != 0; 798 m = m->m_next) { 799 /* Find the beginning mbuf. */ 800 if (moff >= m->m_len) { 801 moff -= m->m_len; 802 continue; 803 } 804 805 /* 806 * Now at the first mbuf to sync; nail 807 * each one until we have exhausted the 808 * length. 809 */ 810 minlen = len < m->m_len - moff ? 811 len : m->m_len - moff; 812 813 memcpy(mtod(m, caddr_t) + moff, 814 (char *)cookie->id_bouncebuf + offset, 815 minlen); 816 817 moff = 0; 818 len -= minlen; 819 offset += minlen; 820 } 821 } 822 823 /* 824 * Nothing to do for post-write. 825 */ 826 break; 827 } 828 829 case ID_BUFTYPE_UIO: 830 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_UIO"); 831 break; 832 833 case ID_BUFTYPE_RAW: 834 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_RAW"); 835 break; 836 837 case ID_BUFTYPE_INVALID: 838 panic("_intio_bus_dmamap_sync: ID_BUFTYPE_INVALID"); 839 break; 840 841 default: 842 printf("unknown buffer type %d\n", cookie->id_buftype); 843 panic("_intio_bus_dmamap_sync"); 844 } 845 } 846 847 /* 848 * Allocate memory safe for INTIO DMA. 849 */ 850 int 851 _intio_bus_dmamem_alloc(bus_dma_tag_t t, bus_size_t size, bus_size_t alignment, 852 bus_size_t boundary, bus_dma_segment_t *segs, int nsegs, int *rsegs, 853 int flags) 854 { 855 paddr_t high; 856 extern paddr_t avail_end; 857 858 if (avail_end > INTIO_DMA_BOUNCE_THRESHOLD) 859 high = trunc_page(INTIO_DMA_BOUNCE_THRESHOLD); 860 else 861 high = trunc_page(avail_end); 862 863 return (x68k_bus_dmamem_alloc_range(t, size, alignment, boundary, 864 segs, nsegs, rsegs, flags, 0, high)); 865 } 866 867 /********************************************************************** 868 * INTIO DMA utility functions 869 **********************************************************************/ 870 871 int 872 _intio_dma_alloc_bouncebuf(bus_dma_tag_t t, bus_dmamap_t map, bus_size_t size, 873 int flags) 874 { 875 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 876 int error = 0; 877 878 cookie->id_bouncebuflen = round_page(size); 879 error = _intio_bus_dmamem_alloc(t, cookie->id_bouncebuflen, 880 PAGE_SIZE, map->x68k_dm_boundary, cookie->id_bouncesegs, 881 map->x68k_dm_segcnt, &cookie->id_nbouncesegs, flags); 882 if (error) 883 goto out; 884 error = x68k_bus_dmamem_map(t, cookie->id_bouncesegs, 885 cookie->id_nbouncesegs, cookie->id_bouncebuflen, 886 (caddr_t *)&cookie->id_bouncebuf, flags); 887 888 out: 889 if (error) { 890 x68k_bus_dmamem_free(t, cookie->id_bouncesegs, 891 cookie->id_nbouncesegs); 892 cookie->id_bouncebuflen = 0; 893 cookie->id_nbouncesegs = 0; 894 } else { 895 cookie->id_flags |= ID_HAS_BOUNCE; 896 } 897 898 return (error); 899 } 900 901 void 902 _intio_dma_free_bouncebuf(bus_dma_tag_t t, bus_dmamap_t map) 903 { 904 struct intio_dma_cookie *cookie = map->x68k_dm_cookie; 905 906 x68k_bus_dmamem_unmap(t, cookie->id_bouncebuf, 907 cookie->id_bouncebuflen); 908 x68k_bus_dmamem_free(t, cookie->id_bouncesegs, 909 cookie->id_nbouncesegs); 910 cookie->id_bouncebuflen = 0; 911 cookie->id_nbouncesegs = 0; 912 cookie->id_flags &= ~ID_HAS_BOUNCE; 913 } 914
Indexes created Thu Sep 25 06:09:39 GMT 2025