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