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 const 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                 SNDRV_PCM_INFO_PAUSE |
  25                 SNDRV_PCM_INFO_RESUME,
  26         .buffer_bytes_max = FSL_ASRC_DMABUF_SIZE,
  27         .period_bytes_min = 128,
  28         .period_bytes_max = 65535, /* Limited by SDMA engine */
  29         .periods_min = 2,
  30         .periods_max = 255,
  31         .fifo_size = 0,
  32 };
  33
  34 static bool filter(struct dma_chan *chan, void *param)
  35 {
  36         if (!imx_dma_is_general_purpose(chan))
  37                 return false;
  38
  39         chan->private = param;
  40
  41         return true;
  42 }
  43
  44 static void fsl_asrc_dma_complete(void *arg)
  45 {
  46         struct snd_pcm_substream *substream = arg;
  47         struct snd_pcm_runtime *runtime = substream->runtime;
  48         struct fsl_asrc_pair *pair = runtime->private_data;
  49
  50         pair->pos += snd_pcm_lib_period_bytes(substream);
  51         if (pair->pos >= snd_pcm_lib_buffer_bytes(substream))
  52                 pair->pos = 0;
  53
  54         snd_pcm_period_elapsed(substream);
  55 }
  56
  57 static int fsl_asrc_dma_prepare_and_submit(struct snd_pcm_substream *substream)
  58 {
  59         u8 dir = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? OUT : IN;
  60         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  61         struct snd_pcm_runtime *runtime = substream->runtime;
  62         struct fsl_asrc_pair *pair = runtime->private_data;
  63         struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
  64         struct device *dev = component->dev;
  65         unsigned long flags = DMA_CTRL_ACK;
  66
  67         /* Prepare and submit Front-End DMA channel */
  68         if (!substream->runtime->no_period_wakeup)
  69                 flags |= DMA_PREP_INTERRUPT;
  70
  71         pair->pos = 0;
  72         pair->desc[!dir] = dmaengine_prep_dma_cyclic(
  73                         pair->dma_chan[!dir], runtime->dma_addr,
  74                         snd_pcm_lib_buffer_bytes(substream),
  75                         snd_pcm_lib_period_bytes(substream),
  76                         dir == OUT ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM, flags);
  77         if (!pair->desc[!dir]) {
  78                 dev_err(dev, "failed to prepare slave DMA for Front-End\n");
  79                 return -ENOMEM;
  80         }
  81
  82         pair->desc[!dir]->callback = fsl_asrc_dma_complete;
  83         pair->desc[!dir]->callback_param = substream;
  84
  85         dmaengine_submit(pair->desc[!dir]);
  86
  87         /* Prepare and submit Back-End DMA channel */
  88         pair->desc[dir] = dmaengine_prep_dma_cyclic(
  89                         pair->dma_chan[dir], 0xffff, 64, 64, DMA_DEV_TO_DEV, 0);
  90         if (!pair->desc[dir]) {
  91                 dev_err(dev, "failed to prepare slave DMA for Back-End\n");
  92                 return -ENOMEM;
  93         }
  94
  95         dmaengine_submit(pair->desc[dir]);
  96
  97         return 0;
  98 }
  99
 100 static int fsl_asrc_dma_trigger(struct snd_pcm_substream *substream, int cmd)
 101 {
 102         struct snd_pcm_runtime *runtime = substream->runtime;
 103         struct fsl_asrc_pair *pair = runtime->private_data;
 104         int ret;
 105
 106         switch (cmd) {
 107         case SNDRV_PCM_TRIGGER_START:
 108         case SNDRV_PCM_TRIGGER_RESUME:
 109         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 110                 ret = fsl_asrc_dma_prepare_and_submit(substream);
 111                 if (ret)
 112                         return ret;
 113                 dma_async_issue_pending(pair->dma_chan[IN]);
 114                 dma_async_issue_pending(pair->dma_chan[OUT]);
 115                 break;
 116         case SNDRV_PCM_TRIGGER_STOP:
 117         case SNDRV_PCM_TRIGGER_SUSPEND:
 118         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 119                 dmaengine_terminate_all(pair->dma_chan[OUT]);
 120                 dmaengine_terminate_all(pair->dma_chan[IN]);
 121                 break;
 122         default:
 123                 return -EINVAL;
 124         }
 125
 126         return 0;
 127 }
 128
 129 static int fsl_asrc_dma_hw_params(struct snd_pcm_substream *substream,
 130                                   struct snd_pcm_hw_params *params)
 131 {
 132         enum dma_slave_buswidth buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
 133         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 134         bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
 135         struct snd_dmaengine_dai_dma_data *dma_params_fe = NULL;
 136         struct snd_dmaengine_dai_dma_data *dma_params_be = NULL;
 137         struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
 138         struct snd_pcm_runtime *runtime = substream->runtime;
 139         struct fsl_asrc_pair *pair = runtime->private_data;
 140         struct fsl_asrc *asrc_priv = pair->asrc_priv;
 141         struct dma_slave_config config_fe, config_be;
 142         enum asrc_pair_index index = pair->index;
 143         struct device *dev = component->dev;
 144         int stream = substream->stream;
 145         struct imx_dma_data *tmp_data;
 146         struct snd_soc_dpcm *dpcm;
 147         struct dma_chan *tmp_chan;
 148         struct device *dev_be;
 149         u8 dir = tx ? OUT : IN;
 150         dma_cap_mask_t mask;
 151         int ret;
 152
 153         /* Fetch the Back-End dma_data from DPCM */
 154         list_for_each_entry(dpcm, &rtd->dpcm[stream].be_clients, list_be) {
 155                 struct snd_soc_pcm_runtime *be = dpcm->be;
 156                 struct snd_pcm_substream *substream_be;
 157                 struct snd_soc_dai *dai = be->cpu_dai;
 158
 159                 if (dpcm->fe != rtd)
 160                         continue;
 161
 162                 substream_be = snd_soc_dpcm_get_substream(be, stream);
 163                 dma_params_be = snd_soc_dai_get_dma_data(dai, substream_be);
 164                 dev_be = dai->dev;
 165                 break;
 166         }
 167
 168         if (!dma_params_be) {
 169                 dev_err(dev, "failed to get the substream of Back-End\n");
 170                 return -EINVAL;
 171         }
 172
 173         /* Override dma_data of the Front-End and config its dmaengine */
 174         dma_params_fe = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 175         dma_params_fe->addr = asrc_priv->paddr + REG_ASRDx(!dir, index);
 176         dma_params_fe->maxburst = dma_params_be->maxburst;
 177
 178         pair->dma_chan[!dir] = fsl_asrc_get_dma_channel(pair, !dir);
 179         if (!pair->dma_chan[!dir]) {
 180                 dev_err(dev, "failed to request DMA channel\n");
 181                 return -EINVAL;
 182         }
 183
 184         memset(&config_fe, 0, sizeof(config_fe));
 185         ret = snd_dmaengine_pcm_prepare_slave_config(substream, params, &config_fe);
 186         if (ret) {
 187                 dev_err(dev, "failed to prepare DMA config for Front-End\n");
 188                 return ret;
 189         }
 190
 191         ret = dmaengine_slave_config(pair->dma_chan[!dir], &config_fe);
 192         if (ret) {
 193                 dev_err(dev, "failed to config DMA channel for Front-End\n");
 194                 return ret;
 195         }
 196
 197         /* Request and config DMA channel for Back-End */
 198         dma_cap_zero(mask);
 199         dma_cap_set(DMA_SLAVE, mask);
 200         dma_cap_set(DMA_CYCLIC, mask);
 201
 202         /* Get DMA request of Back-End */
 203         tmp_chan = dma_request_slave_channel(dev_be, tx ? "tx" : "rx");
 204         tmp_data = tmp_chan->private;
 205         pair->dma_data.dma_request = tmp_data->dma_request;
 206         dma_release_channel(tmp_chan);
 207
 208         /* Get DMA request of Front-End */
 209         tmp_chan = fsl_asrc_get_dma_channel(pair, dir);
 210         tmp_data = tmp_chan->private;
 211         pair->dma_data.dma_request2 = tmp_data->dma_request;
 212         pair->dma_data.peripheral_type = tmp_data->peripheral_type;
 213         pair->dma_data.priority = tmp_data->priority;
 214         dma_release_channel(tmp_chan);
 215
 216         pair->dma_chan[dir] = dma_request_channel(mask, filter, &pair->dma_data);
 217         if (!pair->dma_chan[dir]) {
 218                 dev_err(dev, "failed to request DMA channel for Back-End\n");
 219                 return -EINVAL;
 220         }
 221
 222         if (asrc_priv->asrc_width == 16)
 223                 buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
 224         else
 225                 buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
 226
 227         config_be.direction = DMA_DEV_TO_DEV;
 228         config_be.src_addr_width = buswidth;
 229         config_be.src_maxburst = dma_params_be->maxburst;
 230         config_be.dst_addr_width = buswidth;
 231         config_be.dst_maxburst = dma_params_be->maxburst;
 232
 233         if (tx) {
 234                 config_be.src_addr = asrc_priv->paddr + REG_ASRDO(index);
 235                 config_be.dst_addr = dma_params_be->addr;
 236         } else {
 237                 config_be.dst_addr = asrc_priv->paddr + REG_ASRDI(index);
 238                 config_be.src_addr = dma_params_be->addr;
 239         }
 240
 241         ret = dmaengine_slave_config(pair->dma_chan[dir], &config_be);
 242         if (ret) {
 243                 dev_err(dev, "failed to config DMA channel for Back-End\n");
 244                 return ret;
 245         }
 246
 247         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 248
 249         return 0;
 250 }
 251
 252 static int fsl_asrc_dma_hw_free(struct snd_pcm_substream *substream)
 253 {
 254         struct snd_pcm_runtime *runtime = substream->runtime;
 255         struct fsl_asrc_pair *pair = runtime->private_data;
 256
 257         snd_pcm_set_runtime_buffer(substream, NULL);
 258
 259         if (pair->dma_chan[IN])
 260                 dma_release_channel(pair->dma_chan[IN]);
 261
 262         if (pair->dma_chan[OUT])
 263                 dma_release_channel(pair->dma_chan[OUT]);
 264
 265         pair->dma_chan[IN] = NULL;
 266         pair->dma_chan[OUT] = NULL;
 267
 268         return 0;
 269 }
 270
 271 static int fsl_asrc_dma_startup(struct snd_pcm_substream *substream)
 272 {
 273         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 274         struct snd_pcm_runtime *runtime = substream->runtime;
 275         struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
 276         struct device *dev = component->dev;
 277         struct fsl_asrc *asrc_priv = dev_get_drvdata(dev);
 278         struct fsl_asrc_pair *pair;
 279
 280         pair = kzalloc(sizeof(struct fsl_asrc_pair), GFP_KERNEL);
 281         if (!pair)
 282                 return -ENOMEM;
 283
 284         pair->asrc_priv = asrc_priv;
 285
 286         runtime->private_data = pair;
 287
 288         snd_pcm_hw_constraint_integer(substream->runtime,
 289                                       SNDRV_PCM_HW_PARAM_PERIODS);
 290         snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
 291
 292         return 0;
 293 }
 294
 295 static int fsl_asrc_dma_shutdown(struct snd_pcm_substream *substream)
 296 {
 297         struct snd_pcm_runtime *runtime = substream->runtime;
 298         struct fsl_asrc_pair *pair = runtime->private_data;
 299         struct fsl_asrc *asrc_priv;
 300
 301         if (!pair)
 302                 return 0;
 303
 304         asrc_priv = pair->asrc_priv;
 305
 306         if (asrc_priv->pair[pair->index] == pair)
 307                 asrc_priv->pair[pair->index] = NULL;
 308
 309         kfree(pair);
 310
 311         return 0;
 312 }
 313
 314 static snd_pcm_uframes_t fsl_asrc_dma_pcm_pointer(struct snd_pcm_substream *substream)
 315 {
 316         struct snd_pcm_runtime *runtime = substream->runtime;
 317         struct fsl_asrc_pair *pair = runtime->private_data;
 318
 319         return bytes_to_frames(substream->runtime, pair->pos);
 320 }
 321
 322 static const struct snd_pcm_ops fsl_asrc_dma_pcm_ops = {
 323         .ioctl          = snd_pcm_lib_ioctl,
 324         .hw_params      = fsl_asrc_dma_hw_params,
 325         .hw_free        = fsl_asrc_dma_hw_free,
 326         .trigger        = fsl_asrc_dma_trigger,
 327         .open           = fsl_asrc_dma_startup,
 328         .close          = fsl_asrc_dma_shutdown,
 329         .pointer        = fsl_asrc_dma_pcm_pointer,
 330 };
 331
 332 static int fsl_asrc_dma_pcm_new(struct snd_soc_pcm_runtime *rtd)
 333 {
 334         struct snd_card *card = rtd->card->snd_card;
 335         struct snd_pcm_substream *substream;
 336         struct snd_pcm *pcm = rtd->pcm;
 337         int ret, i;
 338
 339         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 340         if (ret) {
 341                 dev_err(card->dev, "failed to set DMA mask\n");
 342                 return ret;
 343         }
 344
 345         for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_LAST; i++) {
 346                 substream = pcm->streams[i].substream;
 347                 if (!substream)
 348                         continue;
 349
 350                 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
 351                                 FSL_ASRC_DMABUF_SIZE, &substream->dma_buffer);
 352                 if (ret) {
 353                         dev_err(card->dev, "failed to allocate DMA buffer\n");
 354                         goto err;
 355                 }
 356         }
 357
 358         return 0;
 359
 360 err:
 361         if (--i == 0 && pcm->streams[i].substream)
 362                 snd_dma_free_pages(&pcm->streams[i].substream->dma_buffer);
 363
 364         return ret;
 365 }
 366
 367 static void fsl_asrc_dma_pcm_free(struct snd_pcm *pcm)
 368 {
 369         struct snd_pcm_substream *substream;
 370         int i;
 371
 372         for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_LAST; i++) {
 373                 substream = pcm->streams[i].substream;
 374                 if (!substream)
 375                         continue;
 376
 377                 snd_dma_free_pages(&substream->dma_buffer);
 378                 substream->dma_buffer.area = NULL;
 379                 substream->dma_buffer.addr = 0;
 380         }
 381 }
 382
 383 struct snd_soc_component_driver fsl_asrc_component = {
 384         .name           = DRV_NAME,
 385         .ops            = &fsl_asrc_dma_pcm_ops,
 386         .pcm_new        = fsl_asrc_dma_pcm_new,
 387         .pcm_free       = fsl_asrc_dma_pcm_free,
 388 };
 389 EXPORT_SYMBOL_GPL(fsl_asrc_component);