vidcaudio.c revision 1.48
1 /* $NetBSD: vidcaudio.c,v 1.48 2011/11/24 03:35:56 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 1.48 2011/11/24 03:35:56 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 vidcaudio_get_locks, 198 }; 199 200 static int 201 vidcaudio_probe(struct device *parent, struct cfdata *cf, void *aux) 202 { 203 int id; 204 205 id = IOMD_ID; 206 207 /* So far I only know about this IOMD */ 208 switch (id) { 209 case RPC600_IOMD_ID: 210 case ARM7500_IOC_ID: 211 case ARM7500FE_IOC_ID: 212 return 1; 213 default: 214 aprint_error("vidcaudio: Unknown IOMD id=%04x", id); 215 return 0; 216 } 217 } 218 219 220 static void 221 vidcaudio_attach(struct device *parent, struct device *self, void *aux) 222 { 223 struct vidcaudio_softc *sc; 224 struct device *beepdev; 225 226 sc = (void *)self; 227 switch (IOMD_ID) { 228 #ifndef EB7500ATX 229 case RPC600_IOMD_ID: 230 sc->sc_is16bit = (cmos_read(0xc4) >> 5) & 1; 231 sc->sc_dma_intr = IRQ_DMASCH0; 232 break; 233 #endif 234 case ARM7500_IOC_ID: 235 case ARM7500FE_IOC_ID: 236 sc->sc_is16bit = true; 237 sc->sc_dma_intr = IRQ_SDMA; 238 break; 239 default: 240 aprint_error(": strange IOMD\n"); 241 return; 242 } 243 244 if (sc->sc_is16bit) 245 aprint_normal(": 16-bit external DAC\n"); 246 else 247 aprint_normal(": 8-bit internal DAC\n"); 248 249 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE); 250 mutex_init(&sc->sc_intr_lock, MUTEX_DEFAULT, IPL_AUDIO); 251 252 /* Install the irq handler for the DMA interrupt */ 253 sc->sc_ih.ih_func = vidcaudio_intr; 254 sc->sc_ih.ih_arg = sc; 255 sc->sc_ih.ih_level = IPL_AUDIO; 256 sc->sc_ih.ih_name = self->dv_xname; 257 258 if (irq_claim(sc->sc_dma_intr, &sc->sc_ih) != 0) { 259 aprint_error("%s: couldn't claim IRQ %d\n", 260 self->dv_xname, sc->sc_dma_intr); 261 return; 262 } 263 264 disable_irq(sc->sc_dma_intr); 265 266 beepdev = audio_attach_mi(&vidcaudio_hw_if, sc, self); 267 #if NPCKBD > 0 268 pckbd_hookup_bell(audiobell, beepdev); 269 #endif 270 } 271 272 static void 273 vidcaudio_close(void *addr) 274 { 275 struct vidcaudio_softc *sc; 276 277 DPRINTF(("DEBUG: vidcaudio_close called\n")); 278 sc = addr; 279 /* 280 * We do this here rather than in vidcaudio_halt_output() 281 * because the latter can be called from interrupt context 282 * (audio_pint()->audio_clear()->vidcaudio_halt_output()). 283 */ 284 if (sc->sc_ppages != NULL) { 285 free(sc->sc_ppages, M_DEVBUF); 286 sc->sc_ppages = NULL; 287 } 288 } 289 290 /* 291 * Interface to the generic audio driver 292 */ 293 294 static int 295 vidcaudio_query_encoding(void *addr, struct audio_encoding *fp) 296 { 297 struct vidcaudio_softc *sc; 298 299 sc = addr; 300 switch (fp->index) { 301 case 0: 302 strcpy(fp->name, AudioEmulaw); 303 fp->encoding = AUDIO_ENCODING_ULAW; 304 fp->precision = 8; 305 fp->flags = AUDIO_ENCODINGFLAG_EMULATED; 306 break; 307 308 case 1: 309 if (sc->sc_is16bit) { 310 strcpy(fp->name, AudioEslinear_le); 311 fp->encoding = AUDIO_ENCODING_SLINEAR_LE; 312 fp->precision = 16; 313 fp->flags = 0; 314 break; 315 } 316 /* FALLTHROUGH */ 317 default: 318 return EINVAL; 319 } 320 return 0; 321 } 322 323 #define MULAW_TO_VIDC(m) (~((m) << 1 | (m) >> 7)) 324 325 static stream_filter_t * 326 mulaw_to_vidc(struct audio_softc *sc, const audio_params_t *from, 327 const audio_params_t *to) 328 { 329 330 return auconv_nocontext_filter_factory(mulaw_to_vidc_fetch_to); 331 } 332 333 static int 334 mulaw_to_vidc_fetch_to(struct audio_softc *sc, stream_fetcher_t *self, 335 audio_stream_t *dst, int max_used) 336 { 337 stream_filter_t *this; 338 int m, err; 339 340 this = (stream_filter_t *)self; 341 if ((err = this->prev->fetch_to(sc, this->prev, this->src, max_used))) 342 return err; 343 m = dst->end - dst->start; 344 m = min(m, max_used); 345 FILTER_LOOP_PROLOGUE(this->src, 1, dst, 1, m) { 346 *d = MULAW_TO_VIDC(*s); 347 } FILTER_LOOP_EPILOGUE(this->src, dst); 348 return 0; 349 } 350 351 static stream_filter_t * 352 mulaw_to_vidc_stereo(struct audio_softc *sc, const audio_params_t *from, 353 const audio_params_t *to) 354 { 355 356 return auconv_nocontext_filter_factory(mulaw_to_vidc_stereo_fetch_to); 357 } 358 359 static int 360 mulaw_to_vidc_stereo_fetch_to(struct audio_softc *sc, stream_fetcher_t *self, 361 audio_stream_t *dst, int max_used) 362 { 363 stream_filter_t *this; 364 int m, err; 365 366 this = (stream_filter_t *)self; 367 max_used = (max_used + 1) & ~1; 368 if ((err = this->prev->fetch_to(sc, this->prev, this->src, max_used / 2))) 369 return err; 370 m = (dst->end - dst->start) & ~1; 371 m = min(m, max_used); 372 FILTER_LOOP_PROLOGUE(this->src, 1, dst, 2, m) { 373 d[0] = d[1] = MULAW_TO_VIDC(*s); 374 } FILTER_LOOP_EPILOGUE(this->src, dst); 375 return 0; 376 } 377 378 static int 379 vidcaudio_set_params(void *addr, int setmode, int usemode, 380 audio_params_t *p, audio_params_t *r, 381 stream_filter_list_t *pfil, stream_filter_list_t *rfil) 382 { 383 audio_params_t hw; 384 struct vidcaudio_softc *sc; 385 int sample_period, ch; 386 387 if ((setmode & AUMODE_PLAY) == 0) 388 return 0; 389 390 sc = addr; 391 if (sc->sc_is16bit) { 392 /* ARM7500ish, 16-bit, two-channel */ 393 hw = *p; 394 if (p->encoding == AUDIO_ENCODING_ULAW && p->precision == 8) { 395 hw.encoding = AUDIO_ENCODING_SLINEAR_LE; 396 hw.precision = hw.validbits = 16; 397 pfil->append(pfil, mulaw_to_linear16, &hw); 398 } else if (p->encoding != AUDIO_ENCODING_SLINEAR_LE || 399 p->precision != 16) 400 return EINVAL; 401 sample_period = 705600 / 4 / p->sample_rate; 402 if (sample_period < 3) sample_period = 3; 403 vidcaudio_rate(sample_period - 2); 404 vidcaudio_ctrl(SCR_SERIAL); 405 hw.sample_rate = 705600 / 4 / sample_period; 406 hw.channels = 2; 407 pfil->prepend(pfil, aurateconv, &hw); 408 } else { 409 /* VIDC20ish, u-law, 8-channel */ 410 if (p->encoding != AUDIO_ENCODING_ULAW || p->precision != 8) 411 return EINVAL; 412 /* 413 * We always use two hardware channels, because using 414 * one at 8kHz gives a nasty whining sound from the 415 * speaker. The aurateconv mechanism doesn't support 416 * ulaw, so we do the channel duplication ourselves, 417 * and don't try to do rate conversion. 418 */ 419 sample_period = 1000000 / 2 / p->sample_rate; 420 if (sample_period < 3) sample_period = 3; 421 p->sample_rate = 1000000 / 2 / sample_period; 422 hw = *p; 423 hw.encoding = AUDIO_ENCODING_NONE; 424 hw.precision = 8; 425 vidcaudio_rate(sample_period - 2); 426 vidcaudio_ctrl(SCR_SDAC | SCR_CLKSEL); 427 if (p->channels == 1) { 428 pfil->append(pfil, mulaw_to_vidc_stereo, &hw); 429 for (ch = 0; ch < 8; ch++) 430 vidcaudio_stereo(ch, SIR_CENTRE); 431 } else { 432 pfil->append(pfil, mulaw_to_vidc, &hw); 433 for (ch = 0; ch < 8; ch += 2) 434 vidcaudio_stereo(ch, SIR_LEFT_100); 435 for (ch = 1; ch < 8; ch += 2) 436 vidcaudio_stereo(ch, SIR_RIGHT_100); 437 } 438 } 439 return 0; 440 } 441 442 static int 443 vidcaudio_round_blocksize(void *addr, int wantblk, 444 int mode, const audio_params_t *param) 445 { 446 int blk; 447 448 /* 449 * Find the smallest power of two that's larger than the 450 * requested block size, but don't allow < 32 (DMA burst is 16 451 * bytes, and single bursts are tricky) or > PAGE_SIZE (DMA is 452 * confined to a page). 453 */ 454 455 for (blk = 32; blk < PAGE_SIZE; blk <<= 1) 456 if (blk >= wantblk) 457 return blk; 458 return blk; 459 } 460 461 static int 462 vidcaudio_trigger_output(void *addr, void *start, void *end, int blksize, 463 void (*intr)(void *), void *arg, const audio_params_t *params) 464 { 465 struct vidcaudio_softc *sc; 466 size_t npages, i; 467 468 DPRINTF(("vidcaudio_trigger_output %p-%p/0x%x\n", 469 start, end, blksize)); 470 471 sc = addr; 472 KASSERT(blksize == vidcaudio_round_blocksize(addr, blksize, 0, NULL)); 473 KASSERT((vaddr_t)start % blksize == 0); 474 475 sc->sc_pblksize = blksize; 476 sc->sc_pbufsize = (char *)end - (char *)start; 477 npages = sc->sc_pbufsize >> PGSHIFT; 478 if (sc->sc_ppages != NULL) 479 free(sc->sc_ppages, M_DEVBUF); 480 sc->sc_ppages = malloc(npages * sizeof(paddr_t), M_DEVBUF, M_WAITOK); 481 if (sc->sc_ppages == NULL) return ENOMEM; 482 for (i = 0; i < npages; i++) 483 if (!pmap_extract(pmap_kernel(), 484 (vaddr_t)start + i * PAGE_SIZE, &sc->sc_ppages[i])) 485 return EIO; 486 sc->sc_poffset = 0; 487 sc->sc_pintr = intr; 488 sc->sc_parg = arg; 489 490 IOMD_WRITE_WORD(IOMD_SD0CR, IOMD_DMACR_CLEAR | IOMD_DMACR_QUADWORD); 491 IOMD_WRITE_WORD(IOMD_SD0CR, IOMD_DMACR_ENABLE | IOMD_DMACR_QUADWORD); 492 493 /* 494 * Queue up the first two blocks, but don't tell audio code 495 * we're finished with them yet. 496 */ 497 sc->sc_pcountdown = 2; 498 499 enable_irq(sc->sc_dma_intr); 500 501 return 0; 502 } 503 504 static int 505 vidcaudio_trigger_input(void *addr, void *start, void *end, int blksize, 506 void (*intr)(void *), void *arg, const audio_params_t *params) 507 { 508 509 return ENODEV; 510 } 511 512 static int 513 vidcaudio_halt_output(void *addr) 514 { 515 struct vidcaudio_softc *sc; 516 517 DPRINTF(("vidcaudio_halt_output\n")); 518 sc = addr; 519 disable_irq(sc->sc_dma_intr); 520 IOMD_WRITE_WORD(IOMD_SD0CR, IOMD_DMACR_CLEAR | IOMD_DMACR_QUADWORD); 521 return 0; 522 } 523 524 static int 525 vidcaudio_halt_input(void *addr) 526 { 527 528 return ENODEV; 529 } 530 531 static int 532 vidcaudio_getdev(void *addr, struct audio_device *retp) 533 { 534 535 *retp = vidcaudio_device; 536 return 0; 537 } 538 539 540 static int 541 vidcaudio_set_port(void *addr, mixer_ctrl_t *cp) 542 { 543 544 return EINVAL; 545 } 546 547 static int 548 vidcaudio_get_port(void *addr, mixer_ctrl_t *cp) 549 { 550 551 return EINVAL; 552 } 553 554 static int 555 vidcaudio_query_devinfo(void *addr, mixer_devinfo_t *dip) 556 { 557 558 return ENXIO; 559 } 560 561 static int 562 vidcaudio_get_props(void *addr) 563 { 564 565 return 0; 566 } 567 568 static void 569 vidcaudio_get_locks(void *opaque, kmutex_t **intr, kmutex_t **thread) 570 { 571 struct vidcaudio_softc *sc = opaque; 572 573 *intr = &sc->sc_intr_lock; 574 *thread = &sc->sc_lock; 575 } 576 577 static void 578 vidcaudio_rate(int rate) 579 { 580 581 WriteWord(vidc_base, VIDC_SFR | rate); 582 } 583 584 static void 585 vidcaudio_ctrl(int ctrl) 586 { 587 588 WriteWord(vidc_base, VIDC_SCR | ctrl); 589 } 590 591 static void 592 vidcaudio_stereo(int channel, int position) 593 { 594 595 channel = channel << 24 | VIDC_SIR0; 596 WriteWord(vidc_base, channel | position); 597 } 598 599 static int 600 vidcaudio_intr(void *arg) 601 { 602 struct vidcaudio_softc *sc; 603 int status; 604 paddr_t pnext, pend; 605 606 sc = arg; 607 mutex_spin_enter(&sc->sc_intr_lock); 608 609 status = IOMD_READ_BYTE(IOMD_SD0ST); 610 DPRINTF(("I[%x]", status)); 611 if ((status & IOMD_DMAST_INT) == 0) { 612 mutex_spin_exit(&sc->sc_intr_lock); 613 return 0; 614 } 615 616 pnext = sc->sc_ppages[sc->sc_poffset >> PGSHIFT] | 617 (sc->sc_poffset & PGOFSET); 618 pend = (pnext + sc->sc_pblksize - 16) & IOMD_DMAEND_OFFSET; 619 620 switch (status & 621 (IOMD_DMAST_OVERRUN | IOMD_DMAST_INT | IOMD_DMAST_BANKB)) { 622 623 case (IOMD_DMAST_INT | IOMD_DMAST_BANKA): 624 case (IOMD_DMAST_OVERRUN | IOMD_DMAST_INT | IOMD_DMAST_BANKB): 625 DPRINTF(("B<0x%08lx,0x%03lx>", pnext, pend)); 626 IOMD_WRITE_WORD(IOMD_SD0CURB, pnext); 627 IOMD_WRITE_WORD(IOMD_SD0ENDB, pend); 628 break; 629 630 case (IOMD_DMAST_INT | IOMD_DMAST_BANKB): 631 case (IOMD_DMAST_OVERRUN | IOMD_DMAST_INT | IOMD_DMAST_BANKA): 632 DPRINTF(("A<0x%08lx,0x%03lx>", pnext, pend)); 633 IOMD_WRITE_WORD(IOMD_SD0CURA, pnext); 634 IOMD_WRITE_WORD(IOMD_SD0ENDA, pend); 635 break; 636 } 637 638 sc->sc_poffset += sc->sc_pblksize; 639 if (sc->sc_poffset >= sc->sc_pbufsize) 640 sc->sc_poffset = 0; 641 642 if (sc->sc_pcountdown > 0) 643 sc->sc_pcountdown--; 644 else 645 (*sc->sc_pintr)(sc->sc_parg); 646 647 mutex_spin_exit(&sc->sc_intr_lock); 648 return 1; 649 } 650
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