sound/soc/fsl/fsl_asrc_dma.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Freescale ASRC ALSA SoC Platform (DMA) driver
   4 //
   5 // Copyright (C) 2014 Freescale Semiconductor, Inc.
   6 //
   7 // Author: Nicolin Chen <nicoleotsuka@gmail.com>
   8
   9 #include <linux/dma-mapping.h>
  10 #include <linux/module.h>
  11 #include <linux/platform_data/dma-imx.h>
  12 #include <sound/dmaengine_pcm.h>
  13 #include <sound/pcm_params.h>
  14
  15 #include "fsl_asrc.h"
  16
  17 #define FSL_ASRC_DMABUF_SIZE    (256 * 1024)
  18
  19 static struct snd_pcm_hardware snd_imx_hardware = {
  20         .info = SNDRV_PCM_INFO_INTERLEAVED |
  21                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
  22                 SNDRV_PCM_INFO_MMAP |
  23                 SNDRV_PCM_INFO_MMAP_VALID,
  24         .buffer_bytes_max = FSL_ASRC_DMABUF_SIZE,
  25         .period_bytes_min = 128,
  26         .period_bytes_max = 65535, /* Limited by SDMA engine */
  27         .periods_min = 2,
  28         .periods_max = 255,
  29         .fifo_size = 0,
  30 };
  31
  32 static bool filter(struct dma_chan *chan, void *param)
  33 {
  34         if (!imx_dma_is_general_purpose(chan))
  35                 return false;
  36
  37         chan->private = param;
  38
  39         return true;
  40 }
  41
  42 static void fsl_asrc_dma_complete(void *arg)
  43 {
  44         struct snd_pcm_substream *substream = arg;
  45         struct snd_pcm_runtime *runtime = substream->runtime;
  46         struct fsl_asrc_pair *pair = runtime->private_data;
  47
  48         pair->pos += snd_pcm_lib_period_bytes(substream);
  49         if (pair->pos >= snd_pcm_lib_buffer_bytes(substream))
  50                 pair->pos = 0;
  51
  52         snd_pcm_period_elapsed(substream);
  53 }
  54
  55 static int fsl_asrc_dma_prepare_and_submit(struct snd_pcm_substream *substream,
  56                                            struct snd_soc_component *component)
  57 {
  58         u8 dir = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? OUT : IN;
  59         struct snd_pcm_runtime *runtime = substream->runtime;
  60         struct fsl_asrc_pair *pair = runtime->private_data;
  61         struct device *dev = component->dev;
  62         unsigned long flags = DMA_CTRL_ACK;
  63
  64         /* Prepare and submit Front-End DMA channel */
  65         if (!substream->runtime->no_period_wakeup)
  66                 flags |= DMA_PREP_INTERRUPT;
  67
  68         pair->pos = 0;
  69         pair->desc[!dir] = dmaengine_prep_dma_cyclic(
  70                         pair->dma_chan[!dir], runtime->dma_addr,
  71                         snd_pcm_lib_buffer_bytes(substream),
  72                         snd_pcm_lib_period_bytes(substream),
  73                         dir == OUT ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM, flags);
  74         if (!pair->desc[!dir]) {
  75                 dev_err(dev, "failed to prepare slave DMA for Front-End\n");
  76                 return -ENOMEM;
  77         }
  78
  79         pair->desc[!dir]->callback = fsl_asrc_dma_complete;
  80         pair->desc[!dir]->callback_param = substream;
  81
  82         dmaengine_submit(pair->desc[!dir]);
  83
  84         /* Prepare and submit Back-End DMA channel */
  85         pair->desc[dir] = dmaengine_prep_dma_cyclic(
  86                         pair->dma_chan[dir], 0xffff, 64, 64, DMA_DEV_TO_DEV, 0);
  87         if (!pair->desc[dir]) {
  88                 dev_err(dev, "failed to prepare slave DMA for Back-End\n");
  89                 return -ENOMEM;
  90         }
  91
  92         dmaengine_submit(pair->desc[dir]);
  93
  94         return 0;
  95 }
  96
  97 static int fsl_asrc_dma_trigger(struct snd_soc_component *component,
  98                                 struct snd_pcm_substream *substream, int cmd)
  99 {
 100         struct snd_pcm_runtime *runtime = substream->runtime;
 101         struct fsl_asrc_pair *pair = runtime->private_data;
 102         int ret;
 103
 104         switch (cmd) {
 105         case SNDRV_PCM_TRIGGER_START:
 106         case SNDRV_PCM_TRIGGER_RESUME:
 107         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 108                 ret = fsl_asrc_dma_prepare_and_submit(substream, component);
 109                 if (ret)
 110                         return ret;
 111                 dma_async_issue_pending(pair->dma_chan[IN]);
 112                 dma_async_issue_pending(pair->dma_chan[OUT]);
 113                 break;
 114         case SNDRV_PCM_TRIGGER_STOP:
 115         case SNDRV_PCM_TRIGGER_SUSPEND:
 116         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 117                 dmaengine_terminate_all(pair->dma_chan[OUT]);
 118                 dmaengine_terminate_all(pair->dma_chan[IN]);
 119                 break;
 120         default:
 121                 return -EINVAL;
 122         }
 123
 124         return 0;
 125 }
 126
 127 static int fsl_asrc_dma_hw_params(struct snd_soc_component *component,
 128                                   struct snd_pcm_substream *substream,
 129                                   struct snd_pcm_hw_params *params)
 130 {
 131         enum dma_slave_buswidth buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
 132         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 133         bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
 134         struct snd_dmaengine_dai_dma_data *dma_params_fe = NULL;
 135         struct snd_dmaengine_dai_dma_data *dma_params_be = NULL;
 136         struct snd_pcm_runtime *runtime = substream->runtime;
 137         struct fsl_asrc_pair *pair = runtime->private_data;
 138         struct fsl_asrc *asrc_priv = pair->asrc_priv;
 139         struct dma_slave_config config_fe, config_be;
 140         enum asrc_pair_index index = pair->index;
 141         struct device *dev = component->dev;
 142         int stream = substream->stream;
 143         struct imx_dma_data *tmp_data;
 144         struct snd_soc_dpcm *dpcm;
 145         struct dma_chan *tmp_chan;
 146         struct device *dev_be;
 147         u8 dir = tx ? OUT : IN;
 148         dma_cap_mask_t mask;
 149         int ret;
 150
 151         /* Fetch the Back-End dma_data from DPCM */
 152         for_each_dpcm_be(rtd, stream, dpcm) {
 153                 struct snd_soc_pcm_runtime *be = dpcm->be;
 154                 struct snd_pcm_substream *substream_be;
 155                 struct snd_soc_dai *dai = be->cpu_dai;
 156
 157                 if (dpcm->fe != rtd)
 158                         continue;
 159
 160                 substream_be = snd_soc_dpcm_get_substream(be, stream);
 161                 dma_params_be = snd_soc_dai_get_dma_data(dai, substream_be);
 162                 dev_be = dai->dev;
 163                 break;
 164         }
 165
 166         if (!dma_params_be) {
 167                 dev_err(dev, "failed to get the substream of Back-End\n");
 168                 return -EINVAL;
 169         }
 170
 171         /* Override dma_data of the Front-End and config its dmaengine */
 172         dma_params_fe = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 173         dma_params_fe->addr = asrc_priv->paddr + REG_ASRDx(!dir, index);
 174         dma_params_fe->maxburst = dma_params_be->maxburst;
 175
 176         pair->dma_chan[!dir] = fsl_asrc_get_dma_channel(pair, !dir);
 177         if (!pair->dma_chan[!dir]) {
 178                 dev_err(dev, "failed to request DMA channel\n");
 179                 return -EINVAL;
 180         }
 181
 182         memset(&config_fe, 0, sizeof(config_fe));
 183         ret = snd_dmaengine_pcm_prepare_slave_config(substream, params, &config_fe);
 184         if (ret) {
 185                 dev_err(dev, "failed to prepare DMA config for Front-End\n");
 186                 return ret;
 187         }
 188
 189         ret = dmaengine_slave_config(pair->dma_chan[!dir], &config_fe);
 190         if (ret) {
 191                 dev_err(dev, "failed to config DMA channel for Front-End\n");
 192                 return ret;
 193         }
 194
 195         /* Request and config DMA channel for Back-End */
 196         dma_cap_zero(mask);
 197         dma_cap_set(DMA_SLAVE, mask);
 198         dma_cap_set(DMA_CYCLIC, mask);
 199
 200         /*
 201          * An EDMA DEV_TO_DEV channel is fixed and bound with DMA event of each
 202          * peripheral, unlike SDMA channel that is allocated dynamically. So no
 203          * need to configure dma_request and dma_request2, but get dma_chan via
 204          * dma_request_slave_channel directly with dma name of Front-End device
 205          */
 206         if (!asrc_priv->soc->use_edma) {
 207                 /* Get DMA request of Back-End */
 208                 tmp_chan = dma_request_slave_channel(dev_be, tx ? "tx" : "rx");
 209                 tmp_data = tmp_chan->private;
 210                 pair->dma_data.dma_request = tmp_data->dma_request;
 211                 dma_release_channel(tmp_chan);
 212
 213                 /* Get DMA request of Front-End */
 214                 tmp_chan = fsl_asrc_get_dma_channel(pair, dir);
 215                 tmp_data = tmp_chan->private;
 216                 pair->dma_data.dma_request2 = tmp_data->dma_request;
 217                 pair->dma_data.peripheral_type = tmp_data->peripheral_type;
 218                 pair->dma_data.priority = tmp_data->priority;
 219                 dma_release_channel(tmp_chan);
 220
 221                 pair->dma_chan[dir] =
 222                         dma_request_channel(mask, filter, &pair->dma_data);
 223         } else {
 224                 pair->dma_chan[dir] =
 225                         fsl_asrc_get_dma_channel(pair, dir);
 226         }
 227
 228         if (!pair->dma_chan[dir]) {
 229                 dev_err(dev, "failed to request DMA channel for Back-End\n");
 230                 return -EINVAL;
 231         }
 232
 233         if (asrc_priv->asrc_width == 16)
 234                 buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
 235         else
 236                 buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
 237
 238         config_be.direction = DMA_DEV_TO_DEV;
 239         config_be.src_addr_width = buswidth;
 240         config_be.src_maxburst = dma_params_be->maxburst;
 241         config_be.dst_addr_width = buswidth;
 242         config_be.dst_maxburst = dma_params_be->maxburst;
 243
 244         if (tx) {
 245                 config_be.src_addr = asrc_priv->paddr + REG_ASRDO(index);
 246                 config_be.dst_addr = dma_params_be->addr;
 247         } else {
 248                 config_be.dst_addr = asrc_priv->paddr + REG_ASRDI(index);
 249                 config_be.src_addr = dma_params_be->addr;
 250         }
 251
 252         ret = dmaengine_slave_config(pair->dma_chan[dir], &config_be);
 253         if (ret) {
 254                 dev_err(dev, "failed to config DMA channel for Back-End\n");
 255                 return ret;
 256         }
 257
 258         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 259
 260         return 0;
 261 }
 262
 263 static int fsl_asrc_dma_hw_free(struct snd_soc_component *component,
 264                                 struct snd_pcm_substream *substream)
 265 {
 266         struct snd_pcm_runtime *runtime = substream->runtime;
 267         struct fsl_asrc_pair *pair = runtime->private_data;
 268
 269         snd_pcm_set_runtime_buffer(substream, NULL);
 270
 271         if (pair->dma_chan[IN])
 272                 dma_release_channel(pair->dma_chan[IN]);
 273
 274         if (pair->dma_chan[OUT])
 275                 dma_release_channel(pair->dma_chan[OUT]);
 276
 277         pair->dma_chan[IN] = NULL;
 278         pair->dma_chan[OUT] = NULL;
 279
 280         return 0;
 281 }
 282
 283 static int fsl_asrc_dma_startup(struct snd_soc_component *component,
 284                                 struct snd_pcm_substream *substream)
 285 {
 286         bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
 287         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 288         struct snd_pcm_runtime *runtime = substream->runtime;
 289         struct snd_dmaengine_dai_dma_data *dma_data;
 290         struct device *dev = component->dev;
 291         struct fsl_asrc *asrc_priv = dev_get_drvdata(dev);
 292         struct fsl_asrc_pair *pair;
 293         struct dma_chan *tmp_chan = NULL;
 294         u8 dir = tx ? OUT : IN;
 295         bool release_pair = true;
 296         int ret = 0;
 297
 298         ret = snd_pcm_hw_constraint_integer(substream->runtime,
 299                                             SNDRV_PCM_HW_PARAM_PERIODS);
 300         if (ret < 0) {
 301                 dev_err(dev, "failed to set pcm hw params periods\n");
 302                 return ret;
 303         }
 304
 305         pair = kzalloc(sizeof(struct fsl_asrc_pair), GFP_KERNEL);
 306         if (!pair)
 307                 return -ENOMEM;
 308
 309         pair->asrc_priv = asrc_priv;
 310
 311         runtime->private_data = pair;
 312
 313         /* Request a dummy pair, which will be released later.
 314          * Request pair function needs channel num as input, for this
 315          * dummy pair, we just request "1" channel temporarily.
 316          */
 317         ret = fsl_asrc_request_pair(1, pair);
 318         if (ret < 0) {
 319                 dev_err(dev, "failed to request asrc pair\n");
 320                 goto req_pair_err;
 321         }
 322
 323         /* Request a dummy dma channel, which will be released later. */
 324         tmp_chan = fsl_asrc_get_dma_channel(pair, dir);
 325         if (!tmp_chan) {
 326                 dev_err(dev, "failed to get dma channel\n");
 327                 ret = -EINVAL;
 328                 goto dma_chan_err;
 329         }
 330
 331         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 332
 333         /* Refine the snd_imx_hardware according to caps of DMA. */
 334         ret = snd_dmaengine_pcm_refine_runtime_hwparams(substream,
 335                                                         dma_data,
 336                                                         &snd_imx_hardware,
 337                                                         tmp_chan);
 338         if (ret < 0) {
 339                 dev_err(dev, "failed to refine runtime hwparams\n");
 340                 goto out;
 341         }
 342
 343         release_pair = false;
 344         snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
 345
 346 out:
 347         dma_release_channel(tmp_chan);
 348
 349 dma_chan_err:
 350         fsl_asrc_release_pair(pair);
 351
 352 req_pair_err:
 353         if (release_pair)
 354                 kfree(pair);
 355
 356         return ret;
 357 }
 358
 359 static int fsl_asrc_dma_shutdown(struct snd_soc_component *component,
 360                                  struct snd_pcm_substream *substream)
 361 {
 362         struct snd_pcm_runtime *runtime = substream->runtime;
 363         struct fsl_asrc_pair *pair = runtime->private_data;
 364         struct fsl_asrc *asrc_priv;
 365
 366         if (!pair)
 367                 return 0;
 368
 369         asrc_priv = pair->asrc_priv;
 370
 371         if (asrc_priv->pair[pair->index] == pair)
 372                 asrc_priv->pair[pair->index] = NULL;
 373
 374         kfree(pair);
 375
 376         return 0;
 377 }
 378
 379 static snd_pcm_uframes_t
 380 fsl_asrc_dma_pcm_pointer(struct snd_soc_component *component,
 381                          struct snd_pcm_substream *substream)
 382 {
 383         struct snd_pcm_runtime *runtime = substream->runtime;
 384         struct fsl_asrc_pair *pair = runtime->private_data;
 385
 386         return bytes_to_frames(substream->runtime, pair->pos);
 387 }
 388
 389 static int fsl_asrc_dma_pcm_new(struct snd_soc_component *component,
 390                                 struct snd_soc_pcm_runtime *rtd)
 391 {
 392         struct snd_card *card = rtd->card->snd_card;
 393         struct snd_pcm_substream *substream;
 394         struct snd_pcm *pcm = rtd->pcm;
 395         int ret, i;
 396
 397         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 398         if (ret) {
 399                 dev_err(card->dev, "failed to set DMA mask\n");
 400                 return ret;
 401         }
 402
 403         for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_LAST; i++) {
 404                 substream = pcm->streams[i].substream;
 405                 if (!substream)
 406                         continue;
 407
 408                 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
 409                                 FSL_ASRC_DMABUF_SIZE, &substream->dma_buffer);
 410                 if (ret) {
 411                         dev_err(card->dev, "failed to allocate DMA buffer\n");
 412                         goto err;
 413                 }
 414         }
 415
 416         return 0;
 417
 418 err:
 419         if (--i == 0 && pcm->streams[i].substream)
 420                 snd_dma_free_pages(&pcm->streams[i].substream->dma_buffer);
 421
 422         return ret;
 423 }
 424
 425 static void fsl_asrc_dma_pcm_free(struct snd_soc_component *component,
 426                                   struct snd_pcm *pcm)
 427 {
 428         struct snd_pcm_substream *substream;
 429         int i;
 430
 431         for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_LAST; i++) {
 432                 substream = pcm->streams[i].substream;
 433                 if (!substream)
 434                         continue;
 435
 436                 snd_dma_free_pages(&substream->dma_buffer);
 437                 substream->dma_buffer.area = NULL;
 438                 substream->dma_buffer.addr = 0;
 439         }
 440 }
 441
 442 struct snd_soc_component_driver fsl_asrc_component = {
 443         .name           = DRV_NAME,
 444         .hw_params      = fsl_asrc_dma_hw_params,
 445         .hw_free        = fsl_asrc_dma_hw_free,
 446         .trigger        = fsl_asrc_dma_trigger,
 447         .open           = fsl_asrc_dma_startup,
 448         .close          = fsl_asrc_dma_shutdown,
 449         .pointer        = fsl_asrc_dma_pcm_pointer,
 450         .pcm_construct  = fsl_asrc_dma_pcm_new,
 451         .pcm_destruct   = fsl_asrc_dma_pcm_free,
 452 };
 453 EXPORT_SYMBOL_GPL(fsl_asrc_component);