sound/soc/sti/uniperif_reader.c

   1 /*
   2  * Copyright (C) STMicroelectronics SA 2015
   3  * Authors: Arnaud Pouliquen <arnaud.pouliquen@st.com>
   4  *          for STMicroelectronics.
   5  * License terms:  GNU General Public License (GPL), version 2
   6  */
   7
   8 #include <sound/soc.h>
   9
  10 #include "uniperif.h"
  11
  12 #define UNIPERIF_READER_I2S_IN 0 /* reader id connected to I2S/TDM TX bus */
  13 /*
  14  * Note: snd_pcm_hardware is linked to DMA controller but is declared here to
  15  * integrate unireader capability in term of rate and supported channels
  16  */
  17 static const struct snd_pcm_hardware uni_reader_pcm_hw = {
  18         .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
  19                 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_MMAP |
  20                 SNDRV_PCM_INFO_MMAP_VALID,
  21         .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE,
  22
  23         .rates = SNDRV_PCM_RATE_CONTINUOUS,
  24         .rate_min = 8000,
  25         .rate_max = 96000,
  26
  27         .channels_min = 2,
  28         .channels_max = 8,
  29
  30         .periods_min = 2,
  31         .periods_max = 48,
  32
  33         .period_bytes_min = 128,
  34         .period_bytes_max = 64 * PAGE_SIZE,
  35         .buffer_bytes_max = 256 * PAGE_SIZE
  36 };
  37
  38 /*
  39  * uni_reader_irq_handler
  40  * In case of error audio stream is stopped; stop action is protected via PCM
  41  * stream lock  to avoid race condition with trigger callback.
  42  */
  43 static irqreturn_t uni_reader_irq_handler(int irq, void *dev_id)
  44 {
  45         irqreturn_t ret = IRQ_NONE;
  46         struct uniperif *reader = dev_id;
  47         unsigned int status;
  48
  49         spin_lock(&reader->irq_lock);
  50         if (!reader->substream)
  51                 goto irq_spin_unlock;
  52
  53         snd_pcm_stream_lock(reader->substream);
  54         if (reader->state == UNIPERIF_STATE_STOPPED) {
  55                 /* Unexpected IRQ: do nothing */
  56                 dev_warn(reader->dev, "unexpected IRQ\n");
  57                 goto stream_unlock;
  58         }
  59
  60         /* Get interrupt status & clear them immediately */
  61         status = GET_UNIPERIF_ITS(reader);
  62         SET_UNIPERIF_ITS_BCLR(reader, status);
  63
  64         /* Check for fifo overflow error */
  65         if (unlikely(status & UNIPERIF_ITS_FIFO_ERROR_MASK(reader))) {
  66                 dev_err(reader->dev, "FIFO error detected\n");
  67
  68                 snd_pcm_stop(reader->substream, SNDRV_PCM_STATE_XRUN);
  69
  70                 ret = IRQ_HANDLED;
  71         }
  72
  73 stream_unlock:
  74         snd_pcm_stream_unlock(reader->substream);
  75 irq_spin_unlock:
  76         spin_unlock(&reader->irq_lock);
  77
  78         return ret;
  79 }
  80
  81 static int uni_reader_prepare_pcm(struct snd_pcm_runtime *runtime,
  82                                   struct uniperif *reader)
  83 {
  84         int slot_width;
  85
  86         /* Force slot width to 32 in I2S mode */
  87         if ((reader->daifmt & SND_SOC_DAIFMT_FORMAT_MASK)
  88                 == SND_SOC_DAIFMT_I2S) {
  89                 slot_width = 32;
  90         } else {
  91                 switch (runtime->format) {
  92                 case SNDRV_PCM_FORMAT_S16_LE:
  93                         slot_width = 16;
  94                         break;
  95                 default:
  96                         slot_width = 32;
  97                         break;
  98                 }
  99         }
 100
 101         /* Number of bits per subframe (i.e one channel sample) on input. */
 102         switch (slot_width) {
 103         case 32:
 104                 SET_UNIPERIF_I2S_FMT_NBIT_32(reader);
 105                 SET_UNIPERIF_I2S_FMT_DATA_SIZE_32(reader);
 106                 break;
 107         case 16:
 108                 SET_UNIPERIF_I2S_FMT_NBIT_16(reader);
 109                 SET_UNIPERIF_I2S_FMT_DATA_SIZE_16(reader);
 110                 break;
 111         default:
 112                 dev_err(reader->dev, "subframe format not supported\n");
 113                 return -EINVAL;
 114         }
 115
 116         /* Configure data memory format */
 117         switch (runtime->format) {
 118         case SNDRV_PCM_FORMAT_S16_LE:
 119                 /* One data word contains two samples */
 120                 SET_UNIPERIF_CONFIG_MEM_FMT_16_16(reader);
 121                 break;
 122
 123         case SNDRV_PCM_FORMAT_S32_LE:
 124                 /*
 125                  * Actually "16 bits/0 bits" means "32/28/24/20/18/16 bits
 126                  * on the MSB then zeros (if less than 32 bytes)"...
 127                  */
 128                 SET_UNIPERIF_CONFIG_MEM_FMT_16_0(reader);
 129                 break;
 130
 131         default:
 132                 dev_err(reader->dev, "format not supported\n");
 133                 return -EINVAL;
 134         }
 135
 136         /* Number of channels must be even */
 137         if ((runtime->channels % 2) || (runtime->channels < 2) ||
 138             (runtime->channels > 10)) {
 139                 dev_err(reader->dev, "%s: invalid nb of channels\n", __func__);
 140                 return -EINVAL;
 141         }
 142
 143         SET_UNIPERIF_I2S_FMT_NUM_CH(reader, runtime->channels / 2);
 144         SET_UNIPERIF_I2S_FMT_ORDER_MSB(reader);
 145
 146         return 0;
 147 }
 148
 149 static int uni_reader_prepare_tdm(struct snd_pcm_runtime *runtime,
 150                                   struct uniperif *reader)
 151 {
 152         int frame_size; /* user tdm frame size in bytes */
 153         /* default unip TDM_WORD_POS_X_Y */
 154         unsigned int word_pos[4] = {
 155                 0x04060002, 0x0C0E080A, 0x14161012, 0x1C1E181A};
 156
 157         frame_size = sti_uniperiph_get_user_frame_size(runtime);
 158
 159         /* fix 16/0 format */
 160         SET_UNIPERIF_CONFIG_MEM_FMT_16_0(reader);
 161         SET_UNIPERIF_I2S_FMT_DATA_SIZE_32(reader);
 162
 163         /* number of words inserted on the TDM line */
 164         SET_UNIPERIF_I2S_FMT_NUM_CH(reader, frame_size / 4 / 2);
 165
 166         SET_UNIPERIF_I2S_FMT_ORDER_MSB(reader);
 167         SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader);
 168         SET_UNIPERIF_TDM_ENABLE_TDM_ENABLE(reader);
 169
 170         /*
 171          * set the timeslots allocation for words in FIFO
 172          *
 173          * HW bug: (LSB word < MSB word) => this config is not possible
 174          *         So if we want (LSB word < MSB) word, then it shall be
 175          *         handled by user
 176          */
 177         sti_uniperiph_get_tdm_word_pos(reader, word_pos);
 178         SET_UNIPERIF_TDM_WORD_POS(reader, 1_2, word_pos[WORD_1_2]);
 179         SET_UNIPERIF_TDM_WORD_POS(reader, 3_4, word_pos[WORD_3_4]);
 180         SET_UNIPERIF_TDM_WORD_POS(reader, 5_6, word_pos[WORD_5_6]);
 181         SET_UNIPERIF_TDM_WORD_POS(reader, 7_8, word_pos[WORD_7_8]);
 182
 183         return 0;
 184 }
 185
 186 static int uni_reader_prepare(struct snd_pcm_substream *substream,
 187                               struct snd_soc_dai *dai)
 188 {
 189         struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
 190         struct uniperif *reader = priv->dai_data.uni;
 191         struct snd_pcm_runtime *runtime = substream->runtime;
 192         int transfer_size, trigger_limit, ret;
 193
 194         /* The reader should be stopped */
 195         if (reader->state != UNIPERIF_STATE_STOPPED) {
 196                 dev_err(reader->dev, "%s: invalid reader state %d\n", __func__,
 197                         reader->state);
 198                 return -EINVAL;
 199         }
 200
 201         /* Calculate transfer size (in fifo cells and bytes) for frame count */
 202         if (reader->type == SND_ST_UNIPERIF_TYPE_TDM) {
 203                 /* transfer size = unip frame size (in 32 bits FIFO cell) */
 204                 transfer_size =
 205                         sti_uniperiph_get_user_frame_size(runtime) / 4;
 206         } else {
 207                 transfer_size = runtime->channels * UNIPERIF_FIFO_FRAMES;
 208         }
 209
 210         /* Calculate number of empty cells available before asserting DREQ */
 211         if (reader->ver < SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0)
 212                 trigger_limit = UNIPERIF_FIFO_SIZE - transfer_size;
 213         else
 214                 /*
 215                  * Since SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0
 216                  * FDMA_TRIGGER_LIMIT also controls when the state switches
 217                  * from OFF or STANDBY to AUDIO DATA.
 218                  */
 219                 trigger_limit = transfer_size;
 220
 221         /* Trigger limit must be an even number */
 222         if ((!trigger_limit % 2) ||
 223             (trigger_limit != 1 && transfer_size % 2) ||
 224             (trigger_limit > UNIPERIF_CONFIG_DMA_TRIG_LIMIT_MASK(reader))) {
 225                 dev_err(reader->dev, "invalid trigger limit %d\n",
 226                         trigger_limit);
 227                 return -EINVAL;
 228         }
 229
 230         SET_UNIPERIF_CONFIG_DMA_TRIG_LIMIT(reader, trigger_limit);
 231
 232         if (UNIPERIF_TYPE_IS_TDM(reader))
 233                 ret = uni_reader_prepare_tdm(runtime, reader);
 234         else
 235                 ret = uni_reader_prepare_pcm(runtime, reader);
 236         if (ret)
 237                 return ret;
 238
 239         switch (reader->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 240         case SND_SOC_DAIFMT_I2S:
 241                 SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader);
 242                 SET_UNIPERIF_I2S_FMT_PADDING_I2S_MODE(reader);
 243                 break;
 244         case SND_SOC_DAIFMT_LEFT_J:
 245                 SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader);
 246                 SET_UNIPERIF_I2S_FMT_PADDING_SONY_MODE(reader);
 247                 break;
 248         case SND_SOC_DAIFMT_RIGHT_J:
 249                 SET_UNIPERIF_I2S_FMT_ALIGN_RIGHT(reader);
 250                 SET_UNIPERIF_I2S_FMT_PADDING_SONY_MODE(reader);
 251                 break;
 252         default:
 253                 dev_err(reader->dev, "format not supported\n");
 254                 return -EINVAL;
 255         }
 256
 257         /* Data clocking (changing) on the rising/falling edge */
 258         switch (reader->daifmt & SND_SOC_DAIFMT_INV_MASK) {
 259         case SND_SOC_DAIFMT_NB_NF:
 260                 SET_UNIPERIF_I2S_FMT_LR_POL_LOW(reader);
 261                 SET_UNIPERIF_I2S_FMT_SCLK_EDGE_RISING(reader);
 262                 break;
 263         case SND_SOC_DAIFMT_NB_IF:
 264                 SET_UNIPERIF_I2S_FMT_LR_POL_HIG(reader);
 265                 SET_UNIPERIF_I2S_FMT_SCLK_EDGE_RISING(reader);
 266                 break;
 267         case SND_SOC_DAIFMT_IB_NF:
 268                 SET_UNIPERIF_I2S_FMT_LR_POL_LOW(reader);
 269                 SET_UNIPERIF_I2S_FMT_SCLK_EDGE_FALLING(reader);
 270                 break;
 271         case SND_SOC_DAIFMT_IB_IF:
 272                 SET_UNIPERIF_I2S_FMT_LR_POL_HIG(reader);
 273                 SET_UNIPERIF_I2S_FMT_SCLK_EDGE_FALLING(reader);
 274                 break;
 275         }
 276
 277         /* Clear any pending interrupts */
 278         SET_UNIPERIF_ITS_BCLR(reader, GET_UNIPERIF_ITS(reader));
 279
 280         SET_UNIPERIF_I2S_FMT_NO_OF_SAMPLES_TO_READ(reader, 0);
 281
 282         /* Set the interrupt mask */
 283         SET_UNIPERIF_ITM_BSET_DMA_ERROR(reader);
 284         SET_UNIPERIF_ITM_BSET_FIFO_ERROR(reader);
 285         SET_UNIPERIF_ITM_BSET_MEM_BLK_READ(reader);
 286
 287         /* Enable underflow recovery interrupts */
 288         if (reader->underflow_enabled) {
 289                 SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_DONE(reader);
 290                 SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_FAILED(reader);
 291         }
 292
 293         /* Reset uniperipheral reader */
 294         return sti_uniperiph_reset(reader);
 295 }
 296
 297 static int uni_reader_start(struct uniperif *reader)
 298 {
 299         /* The reader should be stopped */
 300         if (reader->state != UNIPERIF_STATE_STOPPED) {
 301                 dev_err(reader->dev, "%s: invalid reader state\n", __func__);
 302                 return -EINVAL;
 303         }
 304
 305         /* Enable reader interrupts (and clear possible stalled ones) */
 306         SET_UNIPERIF_ITS_BCLR_FIFO_ERROR(reader);
 307         SET_UNIPERIF_ITM_BSET_FIFO_ERROR(reader);
 308
 309         /* Launch the reader */
 310         SET_UNIPERIF_CTRL_OPERATION_PCM_DATA(reader);
 311
 312         /* Update state to started */
 313         reader->state = UNIPERIF_STATE_STARTED;
 314         return 0;
 315 }
 316
 317 static int uni_reader_stop(struct uniperif *reader)
 318 {
 319         /* The reader should not be in stopped state */
 320         if (reader->state == UNIPERIF_STATE_STOPPED) {
 321                 dev_err(reader->dev, "%s: invalid reader state\n", __func__);
 322                 return -EINVAL;
 323         }
 324
 325         /* Turn the reader off */
 326         SET_UNIPERIF_CTRL_OPERATION_OFF(reader);
 327
 328         /* Disable interrupts */
 329         SET_UNIPERIF_ITM_BCLR(reader, GET_UNIPERIF_ITM(reader));
 330
 331         /* Update state to stopped and return */
 332         reader->state = UNIPERIF_STATE_STOPPED;
 333
 334         return 0;
 335 }
 336
 337 static int  uni_reader_trigger(struct snd_pcm_substream *substream,
 338                                int cmd, struct snd_soc_dai *dai)
 339 {
 340         struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
 341         struct uniperif *reader = priv->dai_data.uni;
 342
 343         switch (cmd) {
 344         case SNDRV_PCM_TRIGGER_START:
 345                 return  uni_reader_start(reader);
 346         case SNDRV_PCM_TRIGGER_STOP:
 347                 return  uni_reader_stop(reader);
 348         default:
 349                 return -EINVAL;
 350         }
 351 }
 352
 353 static int uni_reader_startup(struct snd_pcm_substream *substream,
 354                               struct snd_soc_dai *dai)
 355 {
 356         struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
 357         struct uniperif *reader = priv->dai_data.uni;
 358         unsigned long flags;
 359         int ret;
 360
 361         spin_lock_irqsave(&reader->irq_lock, flags);
 362         reader->substream = substream;
 363         spin_unlock_irqrestore(&reader->irq_lock, flags);
 364
 365         if (!UNIPERIF_TYPE_IS_TDM(reader))
 366                 return 0;
 367
 368         /* refine hw constraint in tdm mode */
 369         ret = snd_pcm_hw_rule_add(substream->runtime, 0,
 370                                   SNDRV_PCM_HW_PARAM_CHANNELS,
 371                                   sti_uniperiph_fix_tdm_chan,
 372                                   reader, SNDRV_PCM_HW_PARAM_CHANNELS,
 373                                   -1);
 374         if (ret < 0)
 375                 return ret;
 376
 377         return snd_pcm_hw_rule_add(substream->runtime, 0,
 378                                    SNDRV_PCM_HW_PARAM_FORMAT,
 379                                    sti_uniperiph_fix_tdm_format,
 380                                    reader, SNDRV_PCM_HW_PARAM_FORMAT,
 381                                    -1);
 382 }
 383
 384 static void uni_reader_shutdown(struct snd_pcm_substream *substream,
 385                                 struct snd_soc_dai *dai)
 386 {
 387         struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
 388         struct uniperif *reader = priv->dai_data.uni;
 389         unsigned long flags;
 390
 391         spin_lock_irqsave(&reader->irq_lock, flags);
 392         if (reader->state != UNIPERIF_STATE_STOPPED) {
 393                 /* Stop the reader */
 394                 uni_reader_stop(reader);
 395         }
 396         reader->substream = NULL;
 397         spin_unlock_irqrestore(&reader->irq_lock, flags);
 398 }
 399
 400 static const struct snd_soc_dai_ops uni_reader_dai_ops = {
 401                 .startup = uni_reader_startup,
 402                 .shutdown = uni_reader_shutdown,
 403                 .prepare = uni_reader_prepare,
 404                 .trigger = uni_reader_trigger,
 405                 .hw_params = sti_uniperiph_dai_hw_params,
 406                 .set_fmt = sti_uniperiph_dai_set_fmt,
 407                 .set_tdm_slot = sti_uniperiph_set_tdm_slot
 408 };
 409
 410 int uni_reader_init(struct platform_device *pdev,
 411                     struct uniperif *reader)
 412 {
 413         int ret = 0;
 414
 415         reader->dev = &pdev->dev;
 416         reader->state = UNIPERIF_STATE_STOPPED;
 417         reader->dai_ops = &uni_reader_dai_ops;
 418
 419         if (UNIPERIF_TYPE_IS_TDM(reader))
 420                 reader->hw = &uni_tdm_hw;
 421         else
 422                 reader->hw = &uni_reader_pcm_hw;
 423
 424         ret = devm_request_irq(&pdev->dev, reader->irq,
 425                                uni_reader_irq_handler, IRQF_SHARED,
 426                                dev_name(&pdev->dev), reader);
 427         if (ret < 0) {
 428                 dev_err(&pdev->dev, "Failed to request IRQ\n");
 429                 return -EBUSY;
 430         }
 431
 432         spin_lock_init(&reader->irq_lock);
 433
 434         return 0;
 435 }
 436 EXPORT_SYMBOL_GPL(uni_reader_init);