vidcaudio.c revision 1.46.40.1
1 /* $NetBSD: vidcaudio.c,v 1.46.40.1 2011/11/20 12:58:45 mrg Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Melvin Tang-Richardson 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the RiscBSD team. 17 * 4. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /*- 33 * Copyright (c) 2003 Ben Harris 34 * 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. The name of the author may not be used to endorse or promote products 45 * derived from this software without specific prior written permission. 46 * 47 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 48 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 49 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 50 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 51 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 52 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 53 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 54 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 55 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 56 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 57 */ 58 59 /* 60 * audio driver for the RiscPC 8/16 bit sound 61 * 62 * Interfaces with the NetBSD generic audio driver to provide SUN 63 * /dev/audio (partial) compatibility. 64 */ 65 66 #include <sys/param.h> /* proc.h */ 67 68 __KERNEL_RCSID(0, "$NetBSD: vidcaudio.c,v 1.46.40.1 2011/11/20 12:58:45 mrg Exp $"); 69 70 #include <sys/audioio.h> 71 #include <sys/conf.h> /* autoconfig functions */ 72 #include <sys/device.h> /* device calls */ 73 #include <sys/errno.h> 74 #include <sys/malloc.h> 75 #include <sys/proc.h> /* device calls */ 76 #include <sys/systm.h> 77 78 #include <uvm/uvm_extern.h> 79 80 #include <dev/audio_if.h> 81 #include <dev/audiobellvar.h> 82 #include <dev/auconv.h> 83 #include <dev/mulaw.h> 84 85 #include <machine/intr.h> 86 #include <machine/machdep.h> 87 #include <arm/arm32/katelib.h> 88 89 #include <arm/iomd/vidcaudiovar.h> 90 #include <arm/iomd/iomdreg.h> 91 #include <arm/iomd/iomdvar.h> 92 #include <arm/iomd/vidc.h> 93 #include <arm/mainbus/mainbus.h> 94 95 #include "pckbd.h" 96 #if NPCKBD > 0 97 #include <dev/pckbport/pckbdvar.h> 98 #endif 99 100 extern int *vidc_base; 101 102 #ifdef VIDCAUDIO_DEBUG 103 #define DPRINTF(x) printf x 104 #else 105 #define DPRINTF(x) 106 #endif 107 108 struct vidcaudio_softc { 109 struct device sc_dev; 110 111 irqhandler_t sc_ih; 112 int sc_dma_intr; 113 114 int sc_is16bit; 115 116 size_t sc_pblksize; 117 vm_offset_t sc_poffset; 118 vm_offset_t sc_pbufsize; 119 paddr_t *sc_ppages; 120 void (*sc_pintr)(void *); 121 void *sc_parg; 122 int sc_pcountdown; 123 124 kmutex_t sc_lock; 125 kmutex_t sc_intr_lock; 126 }; 127 128 static int vidcaudio_probe(struct device *, struct cfdata *, void *); 129 static void vidcaudio_attach(struct device *, struct device *, void *); 130 static void vidcaudio_close(void *); 131 132 static int vidcaudio_intr(void *); 133 static void vidcaudio_rate(int); 134 static void vidcaudio_ctrl(int); 135 static void vidcaudio_stereo(int, int); 136 static stream_filter_factory_t mulaw_to_vidc; 137 static stream_filter_factory_t mulaw_to_vidc_stereo; 138 static int mulaw_to_vidc_fetch_to(struct audio_softc *, stream_fetcher_t *, 139 audio_stream_t *, int); 140 static int mulaw_to_vidc_stereo_fetch_to(struct audio_softc *, stream_fetcher_t *, 141 audio_stream_t *, int); 142 143 CFATTACH_DECL(vidcaudio, sizeof(struct vidcaudio_softc), 144 vidcaudio_probe, vidcaudio_attach, NULL, NULL); 145 146 static int vidcaudio_query_encoding(void *, struct audio_encoding *); 147 static int vidcaudio_set_params(void *, int, int, audio_params_t *, 148 audio_params_t *, stream_filter_list_t *, stream_filter_list_t *); 149 static int vidcaudio_round_blocksize(void *, int, int, const audio_params_t *); 150 static int vidcaudio_trigger_output(void *, void *, void *, int, 151 void (*)(void *), void *, const audio_params_t *); 152 static int vidcaudio_trigger_input(void *, void *, void *, int, 153 void (*)(void *), void *, const audio_params_t *); 154 static int vidcaudio_halt_output(void *); 155 static int vidcaudio_halt_input(void *); 156 static int vidcaudio_getdev(void *, struct audio_device *); 157 static int vidcaudio_set_port(void *, mixer_ctrl_t *); 158 static int vidcaudio_get_port(void *, mixer_ctrl_t *); 159 static int vidcaudio_query_devinfo(void *, mixer_devinfo_t *); 160 static int vidcaudio_get_props(void *); 161 static void vidcaudio_get_locks(void *, kmutex_t **, kmutex_t **); 162 163 static struct audio_device vidcaudio_device = { 164 "ARM VIDC", 165 "", 166 "vidcaudio" 167 }; 168 169 static const struct audio_hw_if vidcaudio_hw_if = { 170 NULL, /* open */ 171 vidcaudio_close, 172 NULL, 173 vidcaudio_query_encoding, 174 vidcaudio_set_params, 175 vidcaudio_round_blocksize, 176 NULL, 177 NULL, 178 NULL, 179 NULL, 180 NULL, 181 vidcaudio_halt_output, 182 vidcaudio_halt_input, 183 NULL, 184 vidcaudio_getdev, 185 NULL, 186 vidcaudio_set_port, 187 vidcaudio_get_port, 188 vidcaudio_query_devinfo, 189 NULL, 190 NULL, 191 NULL, 192 NULL, 193 vidcaudio_get_props, 194 vidcaudio_trigger_output, 195 vidcaudio_trigger_input, 196 NULL, 197 NULL, 198 vidcaudio_get_locks, 199 }; 200 201 static int 202 vidcaudio_probe(struct device *parent, struct cfdata *cf, void *aux) 203 { 204 int id; 205 206 id = IOMD_ID; 207 208 /* So far I only know about this IOMD */ 209 switch (id) { 210 case RPC600_IOMD_ID: 211 case ARM7500_IOC_ID: 212 case ARM7500FE_IOC_ID: 213 return 1; 214 default: 215 aprint_error("vidcaudio: Unknown IOMD id=%04x", id); 216 return 0; 217 } 218 } 219 220 221 static void 222 vidcaudio_attach(struct device *parent, struct device *self, void *aux) 223 { 224 struct vidcaudio_softc *sc; 225 struct device *beepdev; 226 227 sc = (void *)self; 228 switch (IOMD_ID) { 229 #ifndef EB7500ATX 230 case RPC600_IOMD_ID: 231 sc->sc_is16bit = (cmos_read(0xc4) >> 5) & 1; 232 sc->sc_dma_intr = IRQ_DMASCH0; 233 break; 234 #endif 235 case ARM7500_IOC_ID: 236 case ARM7500FE_IOC_ID: 237 sc->sc_is16bit = true; 238 sc->sc_dma_intr = IRQ_SDMA; 239 break; 240 default: 241 aprint_error(": strange IOMD\n"); 242 return; 243 } 244 245 if (sc->sc_is16bit) 246 aprint_normal(": 16-bit external DAC\n"); 247 else 248 aprint_normal(": 8-bit internal DAC\n"); 249 250 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE); 251 mutex_init(&sc->sc_intr_lock, MUTEX_DEFAULT, IPL_SCHED); 252 253 /* Install the irq handler for the DMA interrupt */ 254 sc->sc_ih.ih_func = vidcaudio_intr; 255 sc->sc_ih.ih_arg = sc; 256 sc->sc_ih.ih_level = IPL_SCHED; 257 sc->sc_ih.ih_name = self->dv_xname; 258 259 if (irq_claim(sc->sc_dma_intr, &sc->sc_ih) != 0) { 260 aprint_error("%s: couldn't claim IRQ %d\n", 261 self->dv_xname, sc->sc_dma_intr); 262 return; 263 } 264 265 disable_irq(sc->sc_dma_intr); 266 267 beepdev = audio_attach_mi(&vidcaudio_hw_if, sc, self); 268 #if NPCKBD > 0 269 pckbd_hookup_bell(audiobell, beepdev); 270 #endif 271 } 272 273 static void 274 vidcaudio_close(void *addr) 275 { 276 struct vidcaudio_softc *sc; 277 278 DPRINTF(("DEBUG: vidcaudio_close called\n")); 279 sc = addr; 280 /* 281 * We do this here rather than in vidcaudio_halt_output() 282 * because the latter can be called from interrupt context 283 * (audio_pint()->audio_clear()->vidcaudio_halt_output()). 284 */ 285 if (sc->sc_ppages != NULL) { 286 free(sc->sc_ppages, M_DEVBUF); 287 sc->sc_ppages = NULL; 288 } 289 } 290 291 /* 292 * Interface to the generic audio driver 293 */ 294 295 static int 296 vidcaudio_query_encoding(void *addr, struct audio_encoding *fp) 297 { 298 struct vidcaudio_softc *sc; 299 300 sc = addr; 301 switch (fp->index) { 302 case 0: 303 strcpy(fp->name, AudioEmulaw); 304 fp->encoding = AUDIO_ENCODING_ULAW; 305 fp->precision = 8; 306 fp->flags = AUDIO_ENCODINGFLAG_EMULATED; 307 break; 308 309 case 1: 310 if (sc->sc_is16bit) { 311 strcpy(fp->name, AudioEslinear_le); 312 fp->encoding = AUDIO_ENCODING_SLINEAR_LE; 313 fp->precision = 16; 314 fp->flags = 0; 315 break; 316 } 317 /* FALLTHROUGH */ 318 default: 319 return EINVAL; 320 } 321 return 0; 322 } 323 324 #define MULAW_TO_VIDC(m) (~((m) << 1 | (m) >> 7)) 325 326 static stream_filter_t * 327 mulaw_to_vidc(struct audio_softc *sc, const audio_params_t *from, 328 const audio_params_t *to) 329 { 330 331 return auconv_nocontext_filter_factory(mulaw_to_vidc_fetch_to); 332 } 333 334 static int 335 mulaw_to_vidc_fetch_to(struct audio_softc *sc, stream_fetcher_t *self, 336 audio_stream_t *dst, int max_used) 337 { 338 stream_filter_t *this; 339 int m, err; 340 341 this = (stream_filter_t *)self; 342 if ((err = this->prev->fetch_to(sc, this->prev, this->src, max_used))) 343 return err; 344 m = dst->end - dst->start; 345 m = min(m, max_used); 346 FILTER_LOOP_PROLOGUE(this->src, 1, dst, 1, m) { 347 *d = MULAW_TO_VIDC(*s); 348 } FILTER_LOOP_EPILOGUE(this->src, dst); 349 return 0; 350 } 351 352 static stream_filter_t * 353 mulaw_to_vidc_stereo(struct audio_softc *sc, const audio_params_t *from, 354 const audio_params_t *to) 355 { 356 357 return auconv_nocontext_filter_factory(mulaw_to_vidc_stereo_fetch_to); 358 } 359 360 static int 361 mulaw_to_vidc_stereo_fetch_to(struct audio_softc *sc, stream_fetcher_t *self, 362 audio_stream_t *dst, int max_used) 363 { 364 stream_filter_t *this; 365 int m, err; 366 367 this = (stream_filter_t *)self; 368 max_used = (max_used + 1) & ~1; 369 if ((err = this->prev->fetch_to(sc, this->prev, this->src, max_used / 2))) 370 return err; 371 m = (dst->end - dst->start) & ~1; 372 m = min(m, max_used); 373 FILTER_LOOP_PROLOGUE(this->src, 1, dst, 2, m) { 374 d[0] = d[1] = MULAW_TO_VIDC(*s); 375 } FILTER_LOOP_EPILOGUE(this->src, dst); 376 return 0; 377 } 378 379 static int 380 vidcaudio_set_params(void *addr, int setmode, int usemode, 381 audio_params_t *p, audio_params_t *r, 382 stream_filter_list_t *pfil, stream_filter_list_t *rfil) 383 { 384 audio_params_t hw; 385 struct vidcaudio_softc *sc; 386 int sample_period, ch; 387 388 if ((setmode & AUMODE_PLAY) == 0) 389 return 0; 390 391 sc = addr; 392 if (sc->sc_is16bit) { 393 /* ARM7500ish, 16-bit, two-channel */ 394 hw = *p; 395 if (p->encoding == AUDIO_ENCODING_ULAW && p->precision == 8) { 396 hw.encoding = AUDIO_ENCODING_SLINEAR_LE; 397 hw.precision = hw.validbits = 16; 398 pfil->append(pfil, mulaw_to_linear16, &hw); 399 } else if (p->encoding != AUDIO_ENCODING_SLINEAR_LE || 400 p->precision != 16) 401 return EINVAL; 402 sample_period = 705600 / 4 / p->sample_rate; 403 if (sample_period < 3) sample_period = 3; 404 vidcaudio_rate(sample_period - 2); 405 vidcaudio_ctrl(SCR_SERIAL); 406 hw.sample_rate = 705600 / 4 / sample_period; 407 hw.channels = 2; 408 pfil->prepend(pfil, aurateconv, &hw); 409 } else { 410 /* VIDC20ish, u-law, 8-channel */ 411 if (p->encoding != AUDIO_ENCODING_ULAW || p->precision != 8) 412 return EINVAL; 413 /* 414 * We always use two hardware channels, because using 415 * one at 8kHz gives a nasty whining sound from the 416 * speaker. The aurateconv mechanism doesn't support 417 * ulaw, so we do the channel duplication ourselves, 418 * and don't try to do rate conversion. 419 */ 420 sample_period = 1000000 / 2 / p->sample_rate; 421 if (sample_period < 3) sample_period = 3; 422 p->sample_rate = 1000000 / 2 / sample_period; 423 hw = *p; 424 hw.encoding = AUDIO_ENCODING_NONE; 425 hw.precision = 8; 426 vidcaudio_rate(sample_period - 2); 427 vidcaudio_ctrl(SCR_SDAC | SCR_CLKSEL); 428 if (p->channels == 1) { 429 pfil->append(pfil, mulaw_to_vidc_stereo, &hw); 430 for (ch = 0; ch < 8; ch++) 431 vidcaudio_stereo(ch, SIR_CENTRE); 432 } else { 433 pfil->append(pfil, mulaw_to_vidc, &hw); 434 for (ch = 0; ch < 8; ch += 2) 435 vidcaudio_stereo(ch, SIR_LEFT_100); 436 for (ch = 1; ch < 8; ch += 2) 437 vidcaudio_stereo(ch, SIR_RIGHT_100); 438 } 439 } 440 return 0; 441 } 442 443 static int 444 vidcaudio_round_blocksize(void *addr, int wantblk, 445 int mode, const audio_params_t *param) 446 { 447 int blk; 448 449 /* 450 * Find the smallest power of two that's larger than the 451 * requested block size, but don't allow < 32 (DMA burst is 16 452 * bytes, and single bursts are tricky) or > PAGE_SIZE (DMA is 453 * confined to a page). 454 */ 455 456 for (blk = 32; blk < PAGE_SIZE; blk <<= 1) 457 if (blk >= wantblk) 458 return blk; 459 return blk; 460 } 461 462 static int 463 vidcaudio_trigger_output(void *addr, void *start, void *end, int blksize, 464 void (*intr)(void *), void *arg, const audio_params_t *params) 465 { 466 struct vidcaudio_softc *sc; 467 size_t npages, i; 468 469 DPRINTF(("vidcaudio_trigger_output %p-%p/0x%x\n", 470 start, end, blksize)); 471 472 sc = addr; 473 KASSERT(blksize == vidcaudio_round_blocksize(addr, blksize, 0, NULL)); 474 KASSERT((vaddr_t)start % blksize == 0); 475 476 sc->sc_pblksize = blksize; 477 sc->sc_pbufsize = (char *)end - (char *)start; 478 npages = sc->sc_pbufsize >> PGSHIFT; 479 if (sc->sc_ppages != NULL) 480 free(sc->sc_ppages, M_DEVBUF); 481 sc->sc_ppages = malloc(npages * sizeof(paddr_t), M_DEVBUF, M_WAITOK); 482 if (sc->sc_ppages == NULL) return ENOMEM; 483 for (i = 0; i < npages; i++) 484 if (!pmap_extract(pmap_kernel(), 485 (vaddr_t)start + i * PAGE_SIZE, &sc->sc_ppages[i])) 486 return EIO; 487 sc->sc_poffset = 0; 488 sc->sc_pintr = intr; 489 sc->sc_parg = arg; 490 491 IOMD_WRITE_WORD(IOMD_SD0CR, IOMD_DMACR_CLEAR | IOMD_DMACR_QUADWORD); 492 IOMD_WRITE_WORD(IOMD_SD0CR, IOMD_DMACR_ENABLE | IOMD_DMACR_QUADWORD); 493 494 /* 495 * Queue up the first two blocks, but don't tell audio code 496 * we're finished with them yet. 497 */ 498 sc->sc_pcountdown = 2; 499 500 enable_irq(sc->sc_dma_intr); 501 502 return 0; 503 } 504 505 static int 506 vidcaudio_trigger_input(void *addr, void *start, void *end, int blksize, 507 void (*intr)(void *), void *arg, const audio_params_t *params) 508 { 509 510 return ENODEV; 511 } 512 513 static int 514 vidcaudio_halt_output(void *addr) 515 { 516 struct vidcaudio_softc *sc; 517 518 DPRINTF(("vidcaudio_halt_output\n")); 519 sc = addr; 520 disable_irq(sc->sc_dma_intr); 521 IOMD_WRITE_WORD(IOMD_SD0CR, IOMD_DMACR_CLEAR | IOMD_DMACR_QUADWORD); 522 return 0; 523 } 524 525 static int 526 vidcaudio_halt_input(void *addr) 527 { 528 529 return ENODEV; 530 } 531 532 static int 533 vidcaudio_getdev(void *addr, struct audio_device *retp) 534 { 535 536 *retp = vidcaudio_device; 537 return 0; 538 } 539 540 541 static int 542 vidcaudio_set_port(void *addr, mixer_ctrl_t *cp) 543 { 544 545 return EINVAL; 546 } 547 548 static int 549 vidcaudio_get_port(void *addr, mixer_ctrl_t *cp) 550 { 551 552 return EINVAL; 553 } 554 555 static int 556 vidcaudio_query_devinfo(void *addr, mixer_devinfo_t *dip) 557 { 558 559 return ENXIO; 560 } 561 562 static int 563 vidcaudio_get_props(void *addr) 564 { 565 566 return 0; 567 } 568 569 static void 570 vidcaudio_get_locks(void *opaque, kmutex_t **intr, kmutex_t **thread) 571 { 572 struct vidcaudio_softc *sc = opaque; 573 574 *intr = &sc->sc_intr_lock; 575 *thread = &sc->sc_lock; 576 } 577 578 static void 579 vidcaudio_rate(int rate) 580 { 581 582 WriteWord(vidc_base, VIDC_SFR | rate); 583 } 584 585 static void 586 vidcaudio_ctrl(int ctrl) 587 { 588 589 WriteWord(vidc_base, VIDC_SCR | ctrl); 590 } 591 592 static void 593 vidcaudio_stereo(int channel, int position) 594 { 595 596 channel = channel << 24 | VIDC_SIR0; 597 WriteWord(vidc_base, channel | position); 598 } 599 600 static int 601 vidcaudio_intr(void *arg) 602 { 603 struct vidcaudio_softc *sc; 604 int status; 605 paddr_t pnext, pend; 606 607 sc = arg; 608 mutex_spin_enter(&sc->sc_intr_lock); 609 610 status = IOMD_READ_BYTE(IOMD_SD0ST); 611 DPRINTF(("I[%x]", status)); 612 if ((status & IOMD_DMAST_INT) == 0) { 613 mutex_spin_exit(&sc->sc_intr_lock); 614 return 0; 615 } 616 617 pnext = sc->sc_ppages[sc->sc_poffset >> PGSHIFT] | 618 (sc->sc_poffset & PGOFSET); 619 pend = (pnext + sc->sc_pblksize - 16) & IOMD_DMAEND_OFFSET; 620 621 switch (status & 622 (IOMD_DMAST_OVERRUN | IOMD_DMAST_INT | IOMD_DMAST_BANKB)) { 623 624 case (IOMD_DMAST_INT | IOMD_DMAST_BANKA): 625 case (IOMD_DMAST_OVERRUN | IOMD_DMAST_INT | IOMD_DMAST_BANKB): 626 DPRINTF(("B<0x%08lx,0x%03lx>", pnext, pend)); 627 IOMD_WRITE_WORD(IOMD_SD0CURB, pnext); 628 IOMD_WRITE_WORD(IOMD_SD0ENDB, pend); 629 break; 630 631 case (IOMD_DMAST_INT | IOMD_DMAST_BANKB): 632 case (IOMD_DMAST_OVERRUN | IOMD_DMAST_INT | IOMD_DMAST_BANKA): 633 DPRINTF(("A<0x%08lx,0x%03lx>", pnext, pend)); 634 IOMD_WRITE_WORD(IOMD_SD0CURA, pnext); 635 IOMD_WRITE_WORD(IOMD_SD0ENDA, pend); 636 break; 637 } 638 639 sc->sc_poffset += sc->sc_pblksize; 640 if (sc->sc_poffset >= sc->sc_pbufsize) 641 sc->sc_poffset = 0; 642 643 if (sc->sc_pcountdown > 0) 644 sc->sc_pcountdown--; 645 else 646 (*sc->sc_pintr)(sc->sc_parg); 647 648 mutex_spin_exit(&sc->sc_intr_lock); 649 return 1; 650 } 651
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