1/* 2 * HD-audio stream operations 3 */ 4 5#include <linux/kernel.h> 6#include <linux/delay.h> 7#include <linux/export.h> 8#include <linux/clocksource.h> 9#include <sound/core.h> 10#include <sound/pcm.h> 11#include <sound/hdaudio.h> 12#include <sound/hda_register.h> 13#include "trace.h" 14 15/** 16 * snd_hdac_stream_init - initialize each stream (aka device) 17 * @bus: HD-audio core bus 18 * @azx_dev: HD-audio core stream object to initialize 19 * @idx: stream index number 20 * @direction: stream direction (SNDRV_PCM_STREAM_PLAYBACK or SNDRV_PCM_STREAM_CAPTURE) 21 * @tag: the tag id to assign 22 * 23 * Assign the starting bdl address to each stream (device) and initialize. 24 */ 25void snd_hdac_stream_init(struct hdac_bus *bus, struct hdac_stream *azx_dev, 26 int idx, int direction, int tag) 27{ 28 azx_dev->bus = bus; 29 /* offset: SDI0=0x80, SDI1=0xa0, ... SDO3=0x160 */ 30 azx_dev->sd_addr = bus->remap_addr + (0x20 * idx + 0x80); 31 /* int mask: SDI0=0x01, SDI1=0x02, ... SDO3=0x80 */ 32 azx_dev->sd_int_sta_mask = 1 << idx; 33 azx_dev->index = idx; 34 azx_dev->direction = direction; 35 azx_dev->stream_tag = tag; 36 snd_hdac_dsp_lock_init(azx_dev); 37 list_add_tail(&azx_dev->list, &bus->stream_list); 38} 39EXPORT_SYMBOL_GPL(snd_hdac_stream_init); 40 41/** 42 * snd_hdac_stream_start - start a stream 43 * @azx_dev: HD-audio core stream to start 44 * @fresh_start: false = wallclock timestamp relative to period wallclock 45 * 46 * Start a stream, set start_wallclk and set the running flag. 47 */ 48void snd_hdac_stream_start(struct hdac_stream *azx_dev, bool fresh_start) 49{ 50 struct hdac_bus *bus = azx_dev->bus; 51 52 trace_snd_hdac_stream_start(bus, azx_dev); 53 54 azx_dev->start_wallclk = snd_hdac_chip_readl(bus, WALLCLK); 55 if (!fresh_start) 56 azx_dev->start_wallclk -= azx_dev->period_wallclk; 57 58 /* enable SIE */ 59 snd_hdac_chip_updatel(bus, INTCTL, 0, 1 << azx_dev->index); 60 /* set DMA start and interrupt mask */ 61 snd_hdac_stream_updateb(azx_dev, SD_CTL, 62 0, SD_CTL_DMA_START | SD_INT_MASK); 63 azx_dev->running = true; 64} 65EXPORT_SYMBOL_GPL(snd_hdac_stream_start); 66 67/** 68 * snd_hdac_stream_clear - stop a stream DMA 69 * @azx_dev: HD-audio core stream to stop 70 */ 71void snd_hdac_stream_clear(struct hdac_stream *azx_dev) 72{ 73 snd_hdac_stream_updateb(azx_dev, SD_CTL, 74 SD_CTL_DMA_START | SD_INT_MASK, 0); 75 snd_hdac_stream_writeb(azx_dev, SD_STS, SD_INT_MASK); /* to be sure */ 76 azx_dev->running = false; 77} 78EXPORT_SYMBOL_GPL(snd_hdac_stream_clear); 79 80/** 81 * snd_hdac_stream_stop - stop a stream 82 * @azx_dev: HD-audio core stream to stop 83 * 84 * Stop a stream DMA and disable stream interrupt 85 */ 86void snd_hdac_stream_stop(struct hdac_stream *azx_dev) 87{ 88 trace_snd_hdac_stream_stop(azx_dev->bus, azx_dev); 89 90 snd_hdac_stream_clear(azx_dev); 91 /* disable SIE */ 92 snd_hdac_chip_updatel(azx_dev->bus, INTCTL, 1 << azx_dev->index, 0); 93} 94EXPORT_SYMBOL_GPL(snd_hdac_stream_stop); 95 96/** 97 * snd_hdac_stream_reset - reset a stream 98 * @azx_dev: HD-audio core stream to reset 99 */ 100void snd_hdac_stream_reset(struct hdac_stream *azx_dev) 101{ 102 unsigned char val; 103 int timeout; 104 105 snd_hdac_stream_clear(azx_dev); 106 107 snd_hdac_stream_updateb(azx_dev, SD_CTL, 0, SD_CTL_STREAM_RESET); 108 udelay(3); 109 timeout = 300; 110 do { 111 val = snd_hdac_stream_readb(azx_dev, SD_CTL) & 112 SD_CTL_STREAM_RESET; 113 if (val) 114 break; 115 } while (--timeout); 116 val &= ~SD_CTL_STREAM_RESET; 117 snd_hdac_stream_writeb(azx_dev, SD_CTL, val); 118 udelay(3); 119 120 timeout = 300; 121 /* waiting for hardware to report that the stream is out of reset */ 122 do { 123 val = snd_hdac_stream_readb(azx_dev, SD_CTL) & 124 SD_CTL_STREAM_RESET; 125 if (!val) 126 break; 127 } while (--timeout); 128 129 /* reset first position - may not be synced with hw at this time */ 130 if (azx_dev->posbuf) 131 *azx_dev->posbuf = 0; 132} 133EXPORT_SYMBOL_GPL(snd_hdac_stream_reset); 134 135/** 136 * snd_hdac_stream_setup - set up the SD for streaming 137 * @azx_dev: HD-audio core stream to set up 138 */ 139int snd_hdac_stream_setup(struct hdac_stream *azx_dev) 140{ 141 struct hdac_bus *bus = azx_dev->bus; 142 struct snd_pcm_runtime *runtime; 143 unsigned int val; 144 145 if (azx_dev->substream) 146 runtime = azx_dev->substream->runtime; 147 else 148 runtime = NULL; 149 /* make sure the run bit is zero for SD */ 150 snd_hdac_stream_clear(azx_dev); 151 /* program the stream_tag */ 152 val = snd_hdac_stream_readl(azx_dev, SD_CTL); 153 val = (val & ~SD_CTL_STREAM_TAG_MASK) | 154 (azx_dev->stream_tag << SD_CTL_STREAM_TAG_SHIFT); 155 if (!bus->snoop) 156 val |= SD_CTL_TRAFFIC_PRIO; 157 snd_hdac_stream_writel(azx_dev, SD_CTL, val); 158 159 /* program the length of samples in cyclic buffer */ 160 snd_hdac_stream_writel(azx_dev, SD_CBL, azx_dev->bufsize); 161 162 /* program the stream format */ 163 /* this value needs to be the same as the one programmed */ 164 snd_hdac_stream_writew(azx_dev, SD_FORMAT, azx_dev->format_val); 165 166 /* program the stream LVI (last valid index) of the BDL */ 167 snd_hdac_stream_writew(azx_dev, SD_LVI, azx_dev->frags - 1); 168 169 /* program the BDL address */ 170 /* lower BDL address */ 171 snd_hdac_stream_writel(azx_dev, SD_BDLPL, (u32)azx_dev->bdl.addr); 172 /* upper BDL address */ 173 snd_hdac_stream_writel(azx_dev, SD_BDLPU, 174 upper_32_bits(azx_dev->bdl.addr)); 175 176 /* enable the position buffer */ 177 if (bus->use_posbuf && bus->posbuf.addr) { 178 if (!(snd_hdac_chip_readl(bus, DPLBASE) & AZX_DPLBASE_ENABLE)) 179 snd_hdac_chip_writel(bus, DPLBASE, 180 (u32)bus->posbuf.addr | AZX_DPLBASE_ENABLE); 181 } 182 183 /* set the interrupt enable bits in the descriptor control register */ 184 snd_hdac_stream_updatel(azx_dev, SD_CTL, 0, SD_INT_MASK); 185 186 if (azx_dev->direction == SNDRV_PCM_STREAM_PLAYBACK) 187 azx_dev->fifo_size = 188 snd_hdac_stream_readw(azx_dev, SD_FIFOSIZE) + 1; 189 else 190 azx_dev->fifo_size = 0; 191 192 /* when LPIB delay correction gives a small negative value, 193 * we ignore it; currently set the threshold statically to 194 * 64 frames 195 */ 196 if (runtime && runtime->period_size > 64) 197 azx_dev->delay_negative_threshold = 198 -frames_to_bytes(runtime, 64); 199 else 200 azx_dev->delay_negative_threshold = 0; 201 202 /* wallclk has 24Mhz clock source */ 203 if (runtime) 204 azx_dev->period_wallclk = (((runtime->period_size * 24000) / 205 runtime->rate) * 1000); 206 207 return 0; 208} 209EXPORT_SYMBOL_GPL(snd_hdac_stream_setup); 210 211/** 212 * snd_hdac_stream_cleanup - cleanup a stream 213 * @azx_dev: HD-audio core stream to clean up 214 */ 215void snd_hdac_stream_cleanup(struct hdac_stream *azx_dev) 216{ 217 snd_hdac_stream_writel(azx_dev, SD_BDLPL, 0); 218 snd_hdac_stream_writel(azx_dev, SD_BDLPU, 0); 219 snd_hdac_stream_writel(azx_dev, SD_CTL, 0); 220 azx_dev->bufsize = 0; 221 azx_dev->period_bytes = 0; 222 azx_dev->format_val = 0; 223} 224EXPORT_SYMBOL_GPL(snd_hdac_stream_cleanup); 225 226/** 227 * snd_hdac_stream_assign - assign a stream for the PCM 228 * @bus: HD-audio core bus 229 * @substream: PCM substream to assign 230 * 231 * Look for an unused stream for the given PCM substream, assign it 232 * and return the stream object. If no stream is free, returns NULL. 233 * The function tries to keep using the same stream object when it's used 234 * beforehand. Also, when bus->reverse_assign flag is set, the last free 235 * or matching entry is returned. This is needed for some strange codecs. 236 */ 237struct hdac_stream *snd_hdac_stream_assign(struct hdac_bus *bus, 238 struct snd_pcm_substream *substream) 239{ 240 struct hdac_stream *azx_dev; 241 struct hdac_stream *res = NULL; 242 243 /* make a non-zero unique key for the substream */ 244 int key = (substream->pcm->device << 16) | (substream->number << 2) | 245 (substream->stream + 1); 246 247 list_for_each_entry(azx_dev, &bus->stream_list, list) { 248 if (azx_dev->direction != substream->stream) 249 continue; 250 if (azx_dev->opened) 251 continue; 252 if (azx_dev->assigned_key == key) { 253 res = azx_dev; 254 break; 255 } 256 if (!res || bus->reverse_assign) 257 res = azx_dev; 258 } 259 if (res) { 260 spin_lock_irq(&bus->reg_lock); 261 res->opened = 1; 262 res->running = 0; 263 res->assigned_key = key; 264 res->substream = substream; 265 spin_unlock_irq(&bus->reg_lock); 266 } 267 return res; 268} 269EXPORT_SYMBOL_GPL(snd_hdac_stream_assign); 270 271/** 272 * snd_hdac_stream_release - release the assigned stream 273 * @azx_dev: HD-audio core stream to release 274 * 275 * Release the stream that has been assigned by snd_hdac_stream_assign(). 276 */ 277void snd_hdac_stream_release(struct hdac_stream *azx_dev) 278{ 279 struct hdac_bus *bus = azx_dev->bus; 280 281 spin_lock_irq(&bus->reg_lock); 282 azx_dev->opened = 0; 283 azx_dev->running = 0; 284 azx_dev->substream = NULL; 285 spin_unlock_irq(&bus->reg_lock); 286} 287EXPORT_SYMBOL_GPL(snd_hdac_stream_release); 288 289/** 290 * snd_hdac_get_stream - return hdac_stream based on stream_tag and 291 * direction 292 * 293 * @bus: HD-audio core bus 294 * @dir: direction for the stream to be found 295 * @stream_tag: stream tag for stream to be found 296 */ 297struct hdac_stream *snd_hdac_get_stream(struct hdac_bus *bus, 298 int dir, int stream_tag) 299{ 300 struct hdac_stream *s; 301 302 list_for_each_entry(s, &bus->stream_list, list) { 303 if (s->direction == dir && s->stream_tag == stream_tag) 304 return s; 305 } 306 307 return NULL; 308} 309EXPORT_SYMBOL_GPL(snd_hdac_get_stream); 310 311/* 312 * set up a BDL entry 313 */ 314static int setup_bdle(struct hdac_bus *bus, 315 struct snd_dma_buffer *dmab, 316 struct hdac_stream *azx_dev, __le32 **bdlp, 317 int ofs, int size, int with_ioc) 318{ 319 __le32 *bdl = *bdlp; 320 321 while (size > 0) { 322 dma_addr_t addr; 323 int chunk; 324 325 if (azx_dev->frags >= AZX_MAX_BDL_ENTRIES) 326 return -EINVAL; 327 328 addr = snd_sgbuf_get_addr(dmab, ofs); 329 /* program the address field of the BDL entry */ 330 bdl[0] = cpu_to_le32((u32)addr); 331 bdl[1] = cpu_to_le32(upper_32_bits(addr)); 332 /* program the size field of the BDL entry */ 333 chunk = snd_sgbuf_get_chunk_size(dmab, ofs, size); 334 /* one BDLE cannot cross 4K boundary on CTHDA chips */ 335 if (bus->align_bdle_4k) { 336 u32 remain = 0x1000 - (ofs & 0xfff); 337 338 if (chunk > remain) 339 chunk = remain; 340 } 341 bdl[2] = cpu_to_le32(chunk); 342 /* program the IOC to enable interrupt 343 * only when the whole fragment is processed 344 */ 345 size -= chunk; 346 bdl[3] = (size || !with_ioc) ? 0 : cpu_to_le32(0x01); 347 bdl += 4; 348 azx_dev->frags++; 349 ofs += chunk; 350 } 351 *bdlp = bdl; 352 return ofs; 353} 354 355/** 356 * snd_hdac_stream_setup_periods - set up BDL entries 357 * @azx_dev: HD-audio core stream to set up 358 * 359 * Set up the buffer descriptor table of the given stream based on the 360 * period and buffer sizes of the assigned PCM substream. 361 */ 362int snd_hdac_stream_setup_periods(struct hdac_stream *azx_dev) 363{ 364 struct hdac_bus *bus = azx_dev->bus; 365 struct snd_pcm_substream *substream = azx_dev->substream; 366 struct snd_pcm_runtime *runtime = substream->runtime; 367 __le32 *bdl; 368 int i, ofs, periods, period_bytes; 369 int pos_adj, pos_align; 370 371 /* reset BDL address */ 372 snd_hdac_stream_writel(azx_dev, SD_BDLPL, 0); 373 snd_hdac_stream_writel(azx_dev, SD_BDLPU, 0); 374 375 period_bytes = azx_dev->period_bytes; 376 periods = azx_dev->bufsize / period_bytes; 377 378 /* program the initial BDL entries */ 379 bdl = (__le32 *)azx_dev->bdl.area; 380 ofs = 0; 381 azx_dev->frags = 0; 382 383 pos_adj = bus->bdl_pos_adj; 384 if (!azx_dev->no_period_wakeup && pos_adj > 0) { 385 pos_align = pos_adj; 386 pos_adj = (pos_adj * runtime->rate + 47999) / 48000; 387 if (!pos_adj) 388 pos_adj = pos_align; 389 else 390 pos_adj = ((pos_adj + pos_align - 1) / pos_align) * 391 pos_align; 392 pos_adj = frames_to_bytes(runtime, pos_adj); 393 if (pos_adj >= period_bytes) { 394 dev_warn(bus->dev, "Too big adjustment %d\n", 395 pos_adj); 396 pos_adj = 0; 397 } else { 398 ofs = setup_bdle(bus, snd_pcm_get_dma_buf(substream), 399 azx_dev, 400 &bdl, ofs, pos_adj, true); 401 if (ofs < 0) 402 goto error; 403 } 404 } else 405 pos_adj = 0; 406 407 for (i = 0; i < periods; i++) { 408 if (i == periods - 1 && pos_adj) 409 ofs = setup_bdle(bus, snd_pcm_get_dma_buf(substream), 410 azx_dev, &bdl, ofs, 411 period_bytes - pos_adj, 0); 412 else 413 ofs = setup_bdle(bus, snd_pcm_get_dma_buf(substream), 414 azx_dev, &bdl, ofs, 415 period_bytes, 416 !azx_dev->no_period_wakeup); 417 if (ofs < 0) 418 goto error; 419 } 420 return 0; 421 422 error: 423 dev_err(bus->dev, "Too many BDL entries: buffer=%d, period=%d\n", 424 azx_dev->bufsize, period_bytes); 425 return -EINVAL; 426} 427EXPORT_SYMBOL_GPL(snd_hdac_stream_setup_periods); 428 429/** 430 * snd_hdac_stream_set_params - set stream parameters 431 * @azx_dev: HD-audio core stream for which parameters are to be set 432 * @format_val: format value parameter 433 * 434 * Setup the HD-audio core stream parameters from substream of the stream 435 * and passed format value 436 */ 437int snd_hdac_stream_set_params(struct hdac_stream *azx_dev, 438 unsigned int format_val) 439{ 440 441 unsigned int bufsize, period_bytes; 442 struct snd_pcm_substream *substream = azx_dev->substream; 443 struct snd_pcm_runtime *runtime; 444 int err; 445 446 if (!substream) 447 return -EINVAL; 448 runtime = substream->runtime; 449 bufsize = snd_pcm_lib_buffer_bytes(substream); 450 period_bytes = snd_pcm_lib_period_bytes(substream); 451 452 if (bufsize != azx_dev->bufsize || 453 period_bytes != azx_dev->period_bytes || 454 format_val != azx_dev->format_val || 455 runtime->no_period_wakeup != azx_dev->no_period_wakeup) { 456 azx_dev->bufsize = bufsize; 457 azx_dev->period_bytes = period_bytes; 458 azx_dev->format_val = format_val; 459 azx_dev->no_period_wakeup = runtime->no_period_wakeup; 460 err = snd_hdac_stream_setup_periods(azx_dev); 461 if (err < 0) 462 return err; 463 } 464 return 0; 465} 466EXPORT_SYMBOL_GPL(snd_hdac_stream_set_params); 467 468static cycle_t azx_cc_read(const struct cyclecounter *cc) 469{ 470 struct hdac_stream *azx_dev = container_of(cc, struct hdac_stream, cc); 471 472 return snd_hdac_chip_readl(azx_dev->bus, WALLCLK); 473} 474 475static void azx_timecounter_init(struct hdac_stream *azx_dev, 476 bool force, cycle_t last) 477{ 478 struct timecounter *tc = &azx_dev->tc; 479 struct cyclecounter *cc = &azx_dev->cc; 480 u64 nsec; 481 482 cc->read = azx_cc_read; 483 cc->mask = CLOCKSOURCE_MASK(32); 484 485 /* 486 * Converting from 24 MHz to ns means applying a 125/3 factor. 487 * To avoid any saturation issues in intermediate operations, 488 * the 125 factor is applied first. The division is applied 489 * last after reading the timecounter value. 490 * Applying the 1/3 factor as part of the multiplication 491 * requires at least 20 bits for a decent precision, however 492 * overflows occur after about 4 hours or less, not a option. 493 */ 494 495 cc->mult = 125; /* saturation after 195 years */ 496 cc->shift = 0; 497 498 nsec = 0; /* audio time is elapsed time since trigger */ 499 timecounter_init(tc, cc, nsec); 500 if (force) { 501 /* 502 * force timecounter to use predefined value, 503 * used for synchronized starts 504 */ 505 tc->cycle_last = last; 506 } 507} 508 509/** 510 * snd_hdac_stream_timecounter_init - initialize time counter 511 * @azx_dev: HD-audio core stream (master stream) 512 * @streams: bit flags of streams to set up 513 * 514 * Initializes the time counter of streams marked by the bit flags (each 515 * bit corresponds to the stream index). 516 * The trigger timestamp of PCM substream assigned to the given stream is 517 * updated accordingly, too. 518 */ 519void snd_hdac_stream_timecounter_init(struct hdac_stream *azx_dev, 520 unsigned int streams) 521{ 522 struct hdac_bus *bus = azx_dev->bus; 523 struct snd_pcm_runtime *runtime = azx_dev->substream->runtime; 524 struct hdac_stream *s; 525 bool inited = false; 526 cycle_t cycle_last = 0; 527 int i = 0; 528 529 list_for_each_entry(s, &bus->stream_list, list) { 530 if (streams & (1 << i)) { 531 azx_timecounter_init(s, inited, cycle_last); 532 if (!inited) { 533 inited = true; 534 cycle_last = s->tc.cycle_last; 535 } 536 } 537 i++; 538 } 539 540 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 541 runtime->trigger_tstamp_latched = true; 542} 543EXPORT_SYMBOL_GPL(snd_hdac_stream_timecounter_init); 544 545/** 546 * snd_hdac_stream_sync_trigger - turn on/off stream sync register 547 * @azx_dev: HD-audio core stream (master stream) 548 * @streams: bit flags of streams to sync 549 */ 550void snd_hdac_stream_sync_trigger(struct hdac_stream *azx_dev, bool set, 551 unsigned int streams, unsigned int reg) 552{ 553 struct hdac_bus *bus = azx_dev->bus; 554 unsigned int val; 555 556 if (!reg) 557 reg = AZX_REG_SSYNC; 558 val = _snd_hdac_chip_read(l, bus, reg); 559 if (set) 560 val |= streams; 561 else 562 val &= ~streams; 563 _snd_hdac_chip_write(l, bus, reg, val); 564} 565EXPORT_SYMBOL_GPL(snd_hdac_stream_sync_trigger); 566 567/** 568 * snd_hdac_stream_sync - sync with start/strop trigger operation 569 * @azx_dev: HD-audio core stream (master stream) 570 * @start: true = start, false = stop 571 * @streams: bit flags of streams to sync 572 * 573 * For @start = true, wait until all FIFOs get ready. 574 * For @start = false, wait until all RUN bits are cleared. 575 */ 576void snd_hdac_stream_sync(struct hdac_stream *azx_dev, bool start, 577 unsigned int streams) 578{ 579 struct hdac_bus *bus = azx_dev->bus; 580 int i, nwait, timeout; 581 struct hdac_stream *s; 582 583 for (timeout = 5000; timeout; timeout--) { 584 nwait = 0; 585 i = 0; 586 list_for_each_entry(s, &bus->stream_list, list) { 587 if (streams & (1 << i)) { 588 if (start) { 589 /* check FIFO gets ready */ 590 if (!(snd_hdac_stream_readb(s, SD_STS) & 591 SD_STS_FIFO_READY)) 592 nwait++; 593 } else { 594 /* check RUN bit is cleared */ 595 if (snd_hdac_stream_readb(s, SD_CTL) & 596 SD_CTL_DMA_START) 597 nwait++; 598 } 599 } 600 i++; 601 } 602 if (!nwait) 603 break; 604 cpu_relax(); 605 } 606} 607EXPORT_SYMBOL_GPL(snd_hdac_stream_sync); 608 609#ifdef CONFIG_SND_HDA_DSP_LOADER 610/** 611 * snd_hdac_dsp_prepare - prepare for DSP loading 612 * @azx_dev: HD-audio core stream used for DSP loading 613 * @format: HD-audio stream format 614 * @byte_size: data chunk byte size 615 * @bufp: allocated buffer 616 * 617 * Allocate the buffer for the given size and set up the given stream for 618 * DSP loading. Returns the stream tag (>= 0), or a negative error code. 619 */ 620int snd_hdac_dsp_prepare(struct hdac_stream *azx_dev, unsigned int format, 621 unsigned int byte_size, struct snd_dma_buffer *bufp) 622{ 623 struct hdac_bus *bus = azx_dev->bus; 624 u32 *bdl; 625 int err; 626 627 snd_hdac_dsp_lock(azx_dev); 628 spin_lock_irq(&bus->reg_lock); 629 if (azx_dev->running || azx_dev->locked) { 630 spin_unlock_irq(&bus->reg_lock); 631 err = -EBUSY; 632 goto unlock; 633 } 634 azx_dev->locked = true; 635 spin_unlock_irq(&bus->reg_lock); 636 637 err = bus->io_ops->dma_alloc_pages(bus, SNDRV_DMA_TYPE_DEV_SG, 638 byte_size, bufp); 639 if (err < 0) 640 goto err_alloc; 641 642 azx_dev->substream = NULL; 643 azx_dev->bufsize = byte_size; 644 azx_dev->period_bytes = byte_size; 645 azx_dev->format_val = format; 646 647 snd_hdac_stream_reset(azx_dev); 648 649 /* reset BDL address */ 650 snd_hdac_stream_writel(azx_dev, SD_BDLPL, 0); 651 snd_hdac_stream_writel(azx_dev, SD_BDLPU, 0); 652 653 azx_dev->frags = 0; 654 bdl = (u32 *)azx_dev->bdl.area; 655 err = setup_bdle(bus, bufp, azx_dev, &bdl, 0, byte_size, 0); 656 if (err < 0) 657 goto error; 658 659 snd_hdac_stream_setup(azx_dev); 660 snd_hdac_dsp_unlock(azx_dev); 661 return azx_dev->stream_tag; 662 663 error: 664 bus->io_ops->dma_free_pages(bus, bufp); 665 err_alloc: 666 spin_lock_irq(&bus->reg_lock); 667 azx_dev->locked = false; 668 spin_unlock_irq(&bus->reg_lock); 669 unlock: 670 snd_hdac_dsp_unlock(azx_dev); 671 return err; 672} 673EXPORT_SYMBOL_GPL(snd_hdac_dsp_prepare); 674 675/** 676 * snd_hdac_dsp_trigger - start / stop DSP loading 677 * @azx_dev: HD-audio core stream used for DSP loading 678 * @start: trigger start or stop 679 */ 680void snd_hdac_dsp_trigger(struct hdac_stream *azx_dev, bool start) 681{ 682 if (start) 683 snd_hdac_stream_start(azx_dev, true); 684 else 685 snd_hdac_stream_stop(azx_dev); 686} 687EXPORT_SYMBOL_GPL(snd_hdac_dsp_trigger); 688 689/** 690 * snd_hdac_dsp_cleanup - clean up the stream from DSP loading to normal 691 * @azx_dev: HD-audio core stream used for DSP loading 692 * @dmab: buffer used by DSP loading 693 */ 694void snd_hdac_dsp_cleanup(struct hdac_stream *azx_dev, 695 struct snd_dma_buffer *dmab) 696{ 697 struct hdac_bus *bus = azx_dev->bus; 698 699 if (!dmab->area || !azx_dev->locked) 700 return; 701 702 snd_hdac_dsp_lock(azx_dev); 703 /* reset BDL address */ 704 snd_hdac_stream_writel(azx_dev, SD_BDLPL, 0); 705 snd_hdac_stream_writel(azx_dev, SD_BDLPU, 0); 706 snd_hdac_stream_writel(azx_dev, SD_CTL, 0); 707 azx_dev->bufsize = 0; 708 azx_dev->period_bytes = 0; 709 azx_dev->format_val = 0; 710 711 bus->io_ops->dma_free_pages(bus, dmab); 712 dmab->area = NULL; 713 714 spin_lock_irq(&bus->reg_lock); 715 azx_dev->locked = false; 716 spin_unlock_irq(&bus->reg_lock); 717 snd_hdac_dsp_unlock(azx_dev); 718} 719EXPORT_SYMBOL_GPL(snd_hdac_dsp_cleanup); 720#endif /* CONFIG_SND_HDA_DSP_LOADER */ 721