sound/hda/hdac_stream.c

   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  */
  25 void 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 }
  39 EXPORT_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  */
  48 void 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 }
  65 EXPORT_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  */
  71 void 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 }
  78 EXPORT_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  */
  86 void 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 }
  94 EXPORT_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  */
 100 void 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 }
 133 EXPORT_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  */
 139 int 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 }
 209 EXPORT_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  */
 215 void 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 }
 224 EXPORT_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  */
 237 struct 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 }
 269 EXPORT_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  */
 277 void 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 }
 287 EXPORT_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  */
 297 struct 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 }
 309 EXPORT_SYMBOL_GPL(snd_hdac_get_stream);
 310
 311 /*
 312  * set up a BDL entry
 313  */
 314 static 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  */
 362 int 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 }
 427 EXPORT_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  */
 437 int 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 }
 466 EXPORT_SYMBOL_GPL(snd_hdac_stream_set_params);
 467
 468 static 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
 475 static 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  */
 519 void 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 }
 543 EXPORT_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  */
 550 void 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 }
 565 EXPORT_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  */
 576 void 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 }
 607 EXPORT_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  */
 620 int 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 }
 673 EXPORT_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  */
 680 void 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 }
 687 EXPORT_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  */
 694 void 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 }
 719 EXPORT_SYMBOL_GPL(snd_hdac_dsp_cleanup);
 720 #endif /* CONFIG_SND_HDA_DSP_LOADER */