dma.c revision 1.39.4.3
1 /* $NetBSD: dma.c,v 1.39.4.3 2010/08/11 22:52:01 yamt Exp $ */ 2 3 /*- 4 * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1982, 1990, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)dma.c 8.1 (Berkeley) 6/10/93 61 */ 62 63 /* 64 * DMA driver 65 */ 66 67 #include "opt_m68k_arch.h" 68 69 #include <sys/cdefs.h> 70 __KERNEL_RCSID(0, "$NetBSD: dma.c,v 1.39.4.3 2010/08/11 22:52:01 yamt Exp $"); 71 72 #include <machine/hp300spu.h> /* XXX param.h includes cpu.h */ 73 74 #include <sys/param.h> 75 #include <sys/systm.h> 76 #include <sys/callout.h> 77 #include <sys/device.h> 78 #include <sys/kernel.h> 79 #include <sys/proc.h> 80 81 #include <uvm/uvm_extern.h> 82 83 #include <machine/bus.h> 84 85 #include <m68k/cacheops.h> 86 87 #include <hp300/dev/intiovar.h> 88 #include <hp300/dev/dmareg.h> 89 #include <hp300/dev/dmavar.h> 90 91 /* 92 * The largest single request will be MAXPHYS bytes which will require 93 * at most MAXPHYS/PAGE_SIZE+1 chain elements to describe, i.e. if none of 94 * the buffer pages are physically contiguous (MAXPHYS/PAGE_SIZE) and the 95 * buffer is not page aligned (+1). 96 */ 97 #define DMAMAXIO (MAXPHYS/PAGE_SIZE+1) 98 99 struct dma_chain { 100 int dc_count; 101 char *dc_addr; 102 }; 103 104 struct dma_channel { 105 struct dmaqueue *dm_job; /* current job */ 106 struct dmadevice *dm_hwaddr; /* registers if DMA_C */ 107 struct dmaBdevice *dm_Bhwaddr; /* registers if not DMA_C */ 108 char dm_flags; /* misc. flags */ 109 u_short dm_cmd; /* DMA controller command */ 110 int dm_cur; /* current segment */ 111 int dm_last; /* last segment */ 112 struct dma_chain dm_chain[DMAMAXIO]; /* all segments */ 113 }; 114 115 struct dma_softc { 116 device_t sc_dev; 117 bus_space_tag_t sc_bst; 118 bus_space_handle_t sc_bsh; 119 120 struct dmareg *sc_dmareg; /* pointer to our hardware */ 121 struct dma_channel sc_chan[NDMACHAN]; /* 2 channels */ 122 TAILQ_HEAD(, dmaqueue) sc_queue; /* job queue */ 123 struct callout sc_debug_ch; 124 char sc_type; /* A, B, or C */ 125 int sc_ipl; /* our interrupt level */ 126 void *sc_ih; /* interrupt cookie */ 127 }; 128 129 /* types */ 130 #define DMA_B 0 131 #define DMA_C 1 132 133 /* flags */ 134 #define DMAF_PCFLUSH 0x01 135 #define DMAF_VCFLUSH 0x02 136 #define DMAF_NOINTR 0x04 137 138 static int dmamatch(device_t, cfdata_t, void *); 139 static void dmaattach(device_t, device_t, void *); 140 141 CFATTACH_DECL_NEW(dma, sizeof(struct dma_softc), 142 dmamatch, dmaattach, NULL, NULL); 143 144 static int dmaintr(void *); 145 146 #ifdef DEBUG 147 int dmadebug = 0; 148 #define DDB_WORD 0x01 /* same as DMAGO_WORD */ 149 #define DDB_LWORD 0x02 /* same as DMAGO_LWORD */ 150 #define DDB_FOLLOW 0x04 151 #define DDB_IO 0x08 152 153 static void dmatimeout(void *); 154 int dmatimo[NDMACHAN]; 155 156 long dmahits[NDMACHAN]; 157 long dmamisses[NDMACHAN]; 158 long dmabyte[NDMACHAN]; 159 long dmaword[NDMACHAN]; 160 long dmalword[NDMACHAN]; 161 #endif 162 163 static struct dma_softc *dma_softc; 164 165 static int 166 dmamatch(device_t parent, cfdata_t cf, void *aux) 167 { 168 struct intio_attach_args *ia = aux; 169 static int dmafound = 0; /* can only have one */ 170 171 if (strcmp("dma", ia->ia_modname) != 0 || dmafound) 172 return 0; 173 174 dmafound = 1; 175 return 1; 176 } 177 178 static void 179 dmaattach(device_t parent, device_t self, void *aux) 180 { 181 struct dma_softc *sc = device_private(self); 182 struct intio_attach_args *ia = aux; 183 struct dma_channel *dc; 184 struct dmareg *dma; 185 int i; 186 char rev; 187 188 sc->sc_dev = self; 189 190 /* There's just one. */ 191 dma_softc = sc; 192 193 sc->sc_bst = ia->ia_bst; 194 if (bus_space_map(sc->sc_bst, ia->ia_iobase, INTIO_DEVSIZE, 0, 195 &sc->sc_bsh)) { 196 aprint_error(": can't map registers\n"); 197 return; 198 } 199 200 dma = bus_space_vaddr(sc->sc_bst, sc->sc_bsh); 201 sc->sc_dmareg = dma; 202 203 /* 204 * Determine the DMA type. A DMA_A or DMA_B will fail the 205 * following probe. 206 * 207 * XXX Don't know how to easily differentiate the A and B cards, 208 * so we just hope nobody has an A card (A cards will work if 209 * splbio works out to ipl 3). 210 */ 211 if (hp300_bus_space_probe(sc->sc_bst, sc->sc_bsh, DMA_ID2, 1) == 0) { 212 rev = 'B'; 213 #if !defined(HP320) 214 aprint_normal("\n"); 215 panic("%s: DMA card requires hp320 support", __func__); 216 #endif 217 } else 218 rev = dma->dma_id[2]; 219 220 sc->sc_type = (rev == 'B') ? DMA_B : DMA_C; 221 222 TAILQ_INIT(&sc->sc_queue); 223 callout_init(&sc->sc_debug_ch, 0); 224 225 for (i = 0; i < NDMACHAN; i++) { 226 dc = &sc->sc_chan[i]; 227 dc->dm_job = NULL; 228 switch (i) { 229 case 0: 230 dc->dm_hwaddr = &dma->dma_chan0; 231 dc->dm_Bhwaddr = &dma->dma_Bchan0; 232 break; 233 234 case 1: 235 dc->dm_hwaddr = &dma->dma_chan1; 236 dc->dm_Bhwaddr = &dma->dma_Bchan1; 237 break; 238 239 default: 240 aprint_normal("\n"); 241 panic("%s: more than 2 channels?", __func__); 242 /* NOTREACHED */ 243 } 244 } 245 246 #ifdef DEBUG 247 /* make sure timeout is really not needed */ 248 callout_reset(&sc->sc_debug_ch, 30 * hz, dmatimeout, sc); 249 #endif 250 251 aprint_normal(": 98620%c, 2 channels, %d-bit DMA\n", 252 rev, (rev == 'B') ? 16 : 32); 253 254 /* 255 * Defer hooking up our interrupt until the first 256 * DMA-using controller has hooked up theirs. 257 */ 258 sc->sc_ih = NULL; 259 } 260 261 /* 262 * Compute the ipl and (re)establish the interrupt handler 263 * for the DMA controller. 264 */ 265 void 266 dmacomputeipl(void) 267 { 268 struct dma_softc *sc = dma_softc; 269 270 if (sc->sc_ih != NULL) 271 intr_disestablish(sc->sc_ih); 272 273 /* 274 * Our interrupt level must be as high as the highest 275 * device using DMA (i.e. splbio). 276 */ 277 sc->sc_ipl = PSLTOIPL(ipl2psl_table[IPL_VM]); 278 sc->sc_ih = intr_establish(dmaintr, sc, sc->sc_ipl, IPL_VM); 279 } 280 281 int 282 dmareq(struct dmaqueue *dq) 283 { 284 struct dma_softc *sc = dma_softc; 285 int i, chan, s; 286 287 #if 1 288 s = splhigh(); /* XXXthorpej */ 289 #else 290 s = splbio(); 291 #endif 292 293 chan = dq->dq_chan; 294 for (i = NDMACHAN - 1; i >= 0; i--) { 295 /* 296 * Can we use this channel? 297 */ 298 if ((chan & (1 << i)) == 0) 299 continue; 300 301 /* 302 * We can use it; is it busy? 303 */ 304 if (sc->sc_chan[i].dm_job != NULL) 305 continue; 306 307 /* 308 * Not busy; give the caller this channel. 309 */ 310 sc->sc_chan[i].dm_job = dq; 311 dq->dq_chan = i; 312 splx(s); 313 return 1; 314 } 315 316 /* 317 * Couldn't get a channel now; put this in the queue. 318 */ 319 TAILQ_INSERT_TAIL(&sc->sc_queue, dq, dq_list); 320 splx(s); 321 return 0; 322 } 323 324 void 325 dmafree(struct dmaqueue *dq) 326 { 327 int unit = dq->dq_chan; 328 struct dma_softc *sc = dma_softc; 329 struct dma_channel *dc = &sc->sc_chan[unit]; 330 struct dmaqueue *dn; 331 int chan, s; 332 333 #if 1 334 s = splhigh(); /* XXXthorpej */ 335 #else 336 s = splbio(); 337 #endif 338 339 #ifdef DEBUG 340 dmatimo[unit] = 0; 341 #endif 342 343 DMA_CLEAR(dc); 344 345 #if defined(CACHE_HAVE_PAC) || defined(M68040) 346 /* 347 * XXX we may not always go thru the flush code in dmastop() 348 */ 349 if (dc->dm_flags & DMAF_PCFLUSH) { 350 PCIA(); 351 dc->dm_flags &= ~DMAF_PCFLUSH; 352 } 353 #endif 354 355 #if defined(CACHE_HAVE_VAC) 356 if (dc->dm_flags & DMAF_VCFLUSH) { 357 /* 358 * 320/350s have VACs that may also need flushing. 359 * In our case we only flush the supervisor side 360 * because we know that if we are DMAing to user 361 * space, the physical pages will also be mapped 362 * in kernel space (via vmapbuf) and hence cache- 363 * inhibited by the pmap module due to the multiple 364 * mapping. 365 */ 366 DCIS(); 367 dc->dm_flags &= ~DMAF_VCFLUSH; 368 } 369 #endif 370 371 /* 372 * Channel is now free. Look for another job to run on this 373 * channel. 374 */ 375 dc->dm_job = NULL; 376 chan = 1 << unit; 377 for (dn = TAILQ_FIRST(&sc->sc_queue); dn != NULL; 378 dn = TAILQ_NEXT(dn, dq_list)) { 379 if (dn->dq_chan & chan) { 380 /* Found one... */ 381 TAILQ_REMOVE(&sc->sc_queue, dn, dq_list); 382 dc->dm_job = dn; 383 dn->dq_chan = dq->dq_chan; 384 splx(s); 385 386 /* Start the initiator. */ 387 (*dn->dq_start)(dn->dq_softc); 388 return; 389 } 390 } 391 splx(s); 392 } 393 394 void 395 dmago(int unit, char *addr, int count, int flags) 396 { 397 struct dma_softc *sc = dma_softc; 398 struct dma_channel *dc = &sc->sc_chan[unit]; 399 char *dmaend = NULL; 400 int seg, tcount; 401 402 if (count > MAXPHYS) 403 panic("dmago: count > MAXPHYS"); 404 405 #if defined(HP320) 406 if (sc->sc_type == DMA_B && (flags & DMAGO_LWORD)) 407 panic("dmago: no can do 32-bit DMA"); 408 #endif 409 410 #ifdef DEBUG 411 if (dmadebug & DDB_FOLLOW) 412 printf("dmago(%d, %p, %x, %x)\n", 413 unit, addr, count, flags); 414 if (flags & DMAGO_LWORD) 415 dmalword[unit]++; 416 else if (flags & DMAGO_WORD) 417 dmaword[unit]++; 418 else 419 dmabyte[unit]++; 420 #endif 421 /* 422 * Build the DMA chain 423 */ 424 for (seg = 0; count > 0; seg++) { 425 dc->dm_chain[seg].dc_addr = (char *) kvtop(addr); 426 #if defined(M68040) 427 /* 428 * Push back dirty cache lines 429 */ 430 if (mmutype == MMU_68040) 431 DCFP((paddr_t)dc->dm_chain[seg].dc_addr); 432 #endif 433 if (count < (tcount = PAGE_SIZE - ((int)addr & PGOFSET))) 434 tcount = count; 435 dc->dm_chain[seg].dc_count = tcount; 436 addr += tcount; 437 count -= tcount; 438 if (flags & DMAGO_LWORD) 439 tcount >>= 2; 440 else if (flags & DMAGO_WORD) 441 tcount >>= 1; 442 443 /* 444 * Try to compact the DMA transfer if the pages are adjacent. 445 * Note: this will never happen on the first iteration. 446 */ 447 if (dc->dm_chain[seg].dc_addr == dmaend 448 #if defined(HP320) 449 /* only 16-bit count on 98620B */ 450 && (sc->sc_type != DMA_B || 451 dc->dm_chain[seg - 1].dc_count + tcount <= 65536) 452 #endif 453 ) { 454 #ifdef DEBUG 455 dmahits[unit]++; 456 #endif 457 dmaend += dc->dm_chain[seg].dc_count; 458 dc->dm_chain[--seg].dc_count += tcount; 459 } else { 460 #ifdef DEBUG 461 dmamisses[unit]++; 462 #endif 463 dmaend = dc->dm_chain[seg].dc_addr + 464 dc->dm_chain[seg].dc_count; 465 dc->dm_chain[seg].dc_count = tcount; 466 } 467 } 468 dc->dm_cur = 0; 469 dc->dm_last = --seg; 470 dc->dm_flags = 0; 471 /* 472 * Set up the command word based on flags 473 */ 474 dc->dm_cmd = DMA_ENAB | DMA_IPL(sc->sc_ipl) | DMA_START; 475 if ((flags & DMAGO_READ) == 0) 476 dc->dm_cmd |= DMA_WRT; 477 if (flags & DMAGO_LWORD) 478 dc->dm_cmd |= DMA_LWORD; 479 else if (flags & DMAGO_WORD) 480 dc->dm_cmd |= DMA_WORD; 481 if (flags & DMAGO_PRI) 482 dc->dm_cmd |= DMA_PRI; 483 484 #if defined(M68040) 485 /* 486 * On the 68040 we need to flush (push) the data cache before a 487 * DMA (already done above) and flush again after DMA completes. 488 * In theory we should only need to flush prior to a write DMA 489 * and purge after a read DMA but if the entire page is not 490 * involved in the DMA we might purge some valid data. 491 */ 492 if (mmutype == MMU_68040 && (flags & DMAGO_READ)) 493 dc->dm_flags |= DMAF_PCFLUSH; 494 #endif 495 496 #if defined(CACHE_HAVE_PAC) 497 /* 498 * Remember if we need to flush external physical cache when 499 * DMA is done. We only do this if we are reading (writing memory). 500 */ 501 if (ectype == EC_PHYS && (flags & DMAGO_READ)) 502 dc->dm_flags |= DMAF_PCFLUSH; 503 #endif 504 505 #if defined(CACHE_HAVE_VAC) 506 if (ectype == EC_VIRT && (flags & DMAGO_READ)) 507 dc->dm_flags |= DMAF_VCFLUSH; 508 #endif 509 510 /* 511 * Remember if we can skip the dma completion interrupt on 512 * the last segment in the chain. 513 */ 514 if (flags & DMAGO_NOINT) { 515 if (dc->dm_cur == dc->dm_last) 516 dc->dm_cmd &= ~DMA_ENAB; 517 else 518 dc->dm_flags |= DMAF_NOINTR; 519 } 520 #ifdef DEBUG 521 if (dmadebug & DDB_IO) { 522 if (((dmadebug&DDB_WORD) && (dc->dm_cmd&DMA_WORD)) || 523 ((dmadebug&DDB_LWORD) && (dc->dm_cmd&DMA_LWORD))) { 524 printf("dmago: cmd %x, flags %x\n", 525 dc->dm_cmd, dc->dm_flags); 526 for (seg = 0; seg <= dc->dm_last; seg++) 527 printf(" %d: %d@%p\n", seg, 528 dc->dm_chain[seg].dc_count, 529 dc->dm_chain[seg].dc_addr); 530 } 531 } 532 dmatimo[unit] = 1; 533 #endif 534 DMA_ARM(sc, dc); 535 } 536 537 void 538 dmastop(int unit) 539 { 540 struct dma_softc *sc = dma_softc; 541 struct dma_channel *dc = &sc->sc_chan[unit]; 542 543 #ifdef DEBUG 544 if (dmadebug & DDB_FOLLOW) 545 printf("dmastop(%d)\n", unit); 546 dmatimo[unit] = 0; 547 #endif 548 DMA_CLEAR(dc); 549 550 #if defined(CACHE_HAVE_PAC) || defined(M68040) 551 if (dc->dm_flags & DMAF_PCFLUSH) { 552 PCIA(); 553 dc->dm_flags &= ~DMAF_PCFLUSH; 554 } 555 #endif 556 557 #if defined(CACHE_HAVE_VAC) 558 if (dc->dm_flags & DMAF_VCFLUSH) { 559 /* 560 * 320/350s have VACs that may also need flushing. 561 * In our case we only flush the supervisor side 562 * because we know that if we are DMAing to user 563 * space, the physical pages will also be mapped 564 * in kernel space (via vmapbuf) and hence cache- 565 * inhibited by the pmap module due to the multiple 566 * mapping. 567 */ 568 DCIS(); 569 dc->dm_flags &= ~DMAF_VCFLUSH; 570 } 571 #endif 572 573 /* 574 * We may get this interrupt after a device service routine 575 * has freed the dma channel. So, ignore the intr if there's 576 * nothing on the queue. 577 */ 578 if (dc->dm_job != NULL) 579 (*dc->dm_job->dq_done)(dc->dm_job->dq_softc); 580 } 581 582 static int 583 dmaintr(void *arg) 584 { 585 struct dma_softc *sc = arg; 586 struct dma_channel *dc; 587 int i, stat; 588 int found = 0; 589 590 #ifdef DEBUG 591 if (dmadebug & DDB_FOLLOW) 592 printf("dmaintr\n"); 593 #endif 594 for (i = 0; i < NDMACHAN; i++) { 595 dc = &sc->sc_chan[i]; 596 stat = DMA_STAT(dc); 597 if ((stat & DMA_INTR) == 0) 598 continue; 599 found++; 600 #ifdef DEBUG 601 if (dmadebug & DDB_IO) { 602 if (((dmadebug&DDB_WORD) && (dc->dm_cmd&DMA_WORD)) || 603 ((dmadebug&DDB_LWORD) && (dc->dm_cmd&DMA_LWORD))) 604 printf("dmaintr: flags %x unit %d stat %x " 605 "next %d\n", 606 dc->dm_flags, i, stat, dc->dm_cur + 1); 607 } 608 if (stat & DMA_ARMED) 609 printf("dma channel %d: intr when armed\n", i); 610 #endif 611 /* 612 * Load the next segemnt, or finish up if we're done. 613 */ 614 dc->dm_cur++; 615 if (dc->dm_cur <= dc->dm_last) { 616 #ifdef DEBUG 617 dmatimo[i] = 1; 618 #endif 619 /* 620 * If we're the last segment, disable the 621 * completion interrupt, if necessary. 622 */ 623 if (dc->dm_cur == dc->dm_last && 624 (dc->dm_flags & DMAF_NOINTR)) 625 dc->dm_cmd &= ~DMA_ENAB; 626 DMA_CLEAR(dc); 627 DMA_ARM(sc, dc); 628 } else 629 dmastop(i); 630 } 631 return found; 632 } 633 634 #ifdef DEBUG 635 static void 636 dmatimeout(void *arg) 637 { 638 int i, s; 639 struct dma_softc *sc = arg; 640 641 for (i = 0; i < NDMACHAN; i++) { 642 s = splbio(); 643 if (dmatimo[i]) { 644 if (dmatimo[i] > 1) 645 printf("dma channel %d timeout #%d\n", 646 i, dmatimo[i]-1); 647 dmatimo[i]++; 648 } 649 splx(s); 650 } 651 callout_reset(&sc->sc_debug_ch, 30 * hz, dmatimeout, sc); 652 } 653 #endif 654
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