sound/soc/sprd/sprd-pcm-dma.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (C) 2019 Spreadtrum Communications Inc.
   3
   4 #include <linux/dma-mapping.h>
   5 #include <linux/dmaengine.h>
   6 #include <linux/dma/sprd-dma.h>
   7 #include <linux/kernel.h>
   8 #include <linux/module.h>
   9 #include <linux/of_reserved_mem.h>
  10 #include <linux/platform_device.h>
  11 #include <sound/pcm.h>
  12 #include <sound/pcm_params.h>
  13 #include <sound/soc.h>
  14
  15 #include "sprd-pcm-dma.h"
  16
  17 #define SPRD_PCM_DMA_LINKLIST_SIZE      64
  18 #define SPRD_PCM_DMA_BRUST_LEN          640
  19
  20 struct sprd_pcm_dma_data {
  21         struct dma_chan *chan;
  22         struct dma_async_tx_descriptor *desc;
  23         dma_cookie_t cookie;
  24         dma_addr_t phys;
  25         void *virt;
  26         int pre_pointer;
  27 };
  28
  29 struct sprd_pcm_dma_private {
  30         struct snd_pcm_substream *substream;
  31         struct sprd_pcm_dma_params *params;
  32         struct sprd_pcm_dma_data data[SPRD_PCM_CHANNEL_MAX];
  33         int hw_chan;
  34         int dma_addr_offset;
  35 };
  36
  37 static const struct snd_pcm_hardware sprd_pcm_hardware = {
  38         .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
  39                 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_PAUSE |
  40                 SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
  41         .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
  42         .period_bytes_min = 1,
  43         .period_bytes_max = 64 * 1024,
  44         .periods_min = 1,
  45         .periods_max = PAGE_SIZE / SPRD_PCM_DMA_LINKLIST_SIZE,
  46         .buffer_bytes_max = 64 * 1024,
  47 };
  48
  49 static int sprd_pcm_open(struct snd_pcm_substream *substream)
  50 {
  51         struct snd_pcm_runtime *runtime = substream->runtime;
  52         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  53         struct snd_soc_component *component =
  54                 snd_soc_rtdcom_lookup(rtd, DRV_NAME);
  55         struct device *dev = component->dev;
  56         struct sprd_pcm_dma_private *dma_private;
  57         int hw_chan = SPRD_PCM_CHANNEL_MAX;
  58         int size, ret, i;
  59
  60         snd_soc_set_runtime_hwparams(substream, &sprd_pcm_hardware);
  61
  62         ret = snd_pcm_hw_constraint_step(runtime, 0,
  63                                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
  64                                          SPRD_PCM_DMA_BRUST_LEN);
  65         if (ret < 0)
  66                 return ret;
  67
  68         ret = snd_pcm_hw_constraint_step(runtime, 0,
  69                                          SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
  70                                          SPRD_PCM_DMA_BRUST_LEN);
  71         if (ret < 0)
  72                 return ret;
  73
  74         ret = snd_pcm_hw_constraint_integer(runtime,
  75                                             SNDRV_PCM_HW_PARAM_PERIODS);
  76         if (ret < 0)
  77                 return ret;
  78
  79         dma_private = devm_kzalloc(dev, sizeof(*dma_private), GFP_KERNEL);
  80         if (!dma_private)
  81                 return -ENOMEM;
  82
  83         size = runtime->hw.periods_max * SPRD_PCM_DMA_LINKLIST_SIZE;
  84
  85         for (i = 0; i < hw_chan; i++) {
  86                 struct sprd_pcm_dma_data *data = &dma_private->data[i];
  87
  88                 data->virt = dmam_alloc_coherent(dev, size, &data->phys,
  89                                                  GFP_KERNEL);
  90                 if (!data->virt) {
  91                         ret = -ENOMEM;
  92                         goto error;
  93                 }
  94         }
  95
  96         dma_private->hw_chan = hw_chan;
  97         runtime->private_data = dma_private;
  98         dma_private->substream = substream;
  99
 100         return 0;
 101
 102 error:
 103         for (i = 0; i < hw_chan; i++) {
 104                 struct sprd_pcm_dma_data *data = &dma_private->data[i];
 105
 106                 if (data->virt)
 107                         dmam_free_coherent(dev, size, data->virt, data->phys);
 108         }
 109
 110         devm_kfree(dev, dma_private);
 111         return ret;
 112 }
 113
 114 static int sprd_pcm_close(struct snd_pcm_substream *substream)
 115 {
 116         struct snd_pcm_runtime *runtime = substream->runtime;
 117         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 118         struct sprd_pcm_dma_private *dma_private = runtime->private_data;
 119         struct snd_soc_component *component =
 120                 snd_soc_rtdcom_lookup(rtd, DRV_NAME);
 121         struct device *dev = component->dev;
 122         int size = runtime->hw.periods_max * SPRD_PCM_DMA_LINKLIST_SIZE;
 123         int i;
 124
 125         for (i = 0; i < dma_private->hw_chan; i++) {
 126                 struct sprd_pcm_dma_data *data = &dma_private->data[i];
 127
 128                 dmam_free_coherent(dev, size, data->virt, data->phys);
 129         }
 130
 131         devm_kfree(dev, dma_private);
 132
 133         return 0;
 134 }
 135
 136 static void sprd_pcm_dma_complete(void *data)
 137 {
 138         struct sprd_pcm_dma_private *dma_private = data;
 139         struct snd_pcm_substream *substream = dma_private->substream;
 140
 141         snd_pcm_period_elapsed(substream);
 142 }
 143
 144 static void sprd_pcm_release_dma_channel(struct snd_pcm_substream *substream)
 145 {
 146         struct snd_pcm_runtime *runtime = substream->runtime;
 147         struct sprd_pcm_dma_private *dma_private = runtime->private_data;
 148         int i;
 149
 150         for (i = 0; i < SPRD_PCM_CHANNEL_MAX; i++) {
 151                 struct sprd_pcm_dma_data *data = &dma_private->data[i];
 152
 153                 if (data->chan) {
 154                         dma_release_channel(data->chan);
 155                         data->chan = NULL;
 156                 }
 157         }
 158 }
 159
 160 static int sprd_pcm_request_dma_channel(struct snd_pcm_substream *substream,
 161                                         int channels)
 162 {
 163         struct snd_pcm_runtime *runtime = substream->runtime;
 164         struct sprd_pcm_dma_private *dma_private = runtime->private_data;
 165         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 166         struct snd_soc_component *component =
 167                 snd_soc_rtdcom_lookup(rtd, DRV_NAME);
 168         struct device *dev = component->dev;
 169         struct sprd_pcm_dma_params *dma_params = dma_private->params;
 170         int i;
 171
 172         if (channels > SPRD_PCM_CHANNEL_MAX) {
 173                 dev_err(dev, "invalid dma channel number:%d\n", channels);
 174                 return -EINVAL;
 175         }
 176
 177         for (i = 0; i < channels; i++) {
 178                 struct sprd_pcm_dma_data *data = &dma_private->data[i];
 179
 180                 data->chan = dma_request_slave_channel(dev,
 181                                                        dma_params->chan_name[i]);
 182                 if (!data->chan) {
 183                         dev_err(dev, "failed to request dma channel:%s\n",
 184                                 dma_params->chan_name[i]);
 185                         sprd_pcm_release_dma_channel(substream);
 186                         return -ENODEV;
 187                 }
 188         }
 189
 190         return 0;
 191 }
 192
 193 static int sprd_pcm_hw_params(struct snd_pcm_substream *substream,
 194                               struct snd_pcm_hw_params *params)
 195 {
 196         struct snd_pcm_runtime *runtime = substream->runtime;
 197         struct sprd_pcm_dma_private *dma_private = runtime->private_data;
 198         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 199         struct snd_soc_component *component =
 200                 snd_soc_rtdcom_lookup(rtd, DRV_NAME);
 201         struct sprd_pcm_dma_params *dma_params;
 202         size_t totsize = params_buffer_bytes(params);
 203         size_t period = params_period_bytes(params);
 204         int channels = params_channels(params);
 205         int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
 206         struct scatterlist *sg;
 207         unsigned long flags;
 208         int ret, i, j, sg_num;
 209
 210         dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 211         if (!dma_params) {
 212                 dev_warn(component->dev, "no dma parameters setting\n");
 213                 dma_private->params = NULL;
 214                 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 215                 runtime->dma_bytes = totsize;
 216                 return 0;
 217         }
 218
 219         if (!dma_private->params) {
 220                 dma_private->params = dma_params;
 221                 ret = sprd_pcm_request_dma_channel(substream, channels);
 222                 if (ret)
 223                         return ret;
 224         }
 225
 226         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 227
 228         runtime->dma_bytes = totsize;
 229         sg_num = totsize / period;
 230         dma_private->dma_addr_offset = totsize / channels;
 231
 232         sg = devm_kcalloc(component->dev, sg_num, sizeof(*sg), GFP_KERNEL);
 233         if (!sg) {
 234                 ret = -ENOMEM;
 235                 goto sg_err;
 236         }
 237
 238         for (i = 0; i < channels; i++) {
 239                 struct sprd_pcm_dma_data *data = &dma_private->data[i];
 240                 struct dma_chan *chan = data->chan;
 241                 struct dma_slave_config config = { };
 242                 struct sprd_dma_linklist link = { };
 243                 enum dma_transfer_direction dir;
 244                 struct scatterlist *sgt = sg;
 245
 246                 config.src_maxburst = dma_params->fragment_len[i];
 247                 config.src_addr_width = dma_params->datawidth[i];
 248                 config.dst_addr_width = dma_params->datawidth[i];
 249                 if (is_playback) {
 250                         config.src_addr = runtime->dma_addr +
 251                                 i * dma_private->dma_addr_offset;
 252                         config.dst_addr = dma_params->dev_phys[i];
 253                         dir = DMA_MEM_TO_DEV;
 254                 } else {
 255                         config.src_addr = dma_params->dev_phys[i];
 256                         config.dst_addr = runtime->dma_addr +
 257                                 i * dma_private->dma_addr_offset;
 258                         dir = DMA_DEV_TO_MEM;
 259                 }
 260
 261                 sg_init_table(sgt, sg_num);
 262                 for (j = 0; j < sg_num; j++, sgt++) {
 263                         u32 sg_len = period / channels;
 264
 265                         sg_dma_len(sgt) = sg_len;
 266                         sg_dma_address(sgt) = runtime->dma_addr +
 267                                 i * dma_private->dma_addr_offset + sg_len * j;
 268                 }
 269
 270                 /*
 271                  * Configure the link-list address for the DMA engine link-list
 272                  * mode.
 273                  */
 274                 link.virt_addr = (unsigned long)data->virt;
 275                 link.phy_addr = data->phys;
 276
 277                 ret = dmaengine_slave_config(chan, &config);
 278                 if (ret) {
 279                         dev_err(component->dev,
 280                                 "failed to set slave configuration: %d\n", ret);
 281                         goto config_err;
 282                 }
 283
 284                 /*
 285                  * We configure the DMA request mode, interrupt mode, channel
 286                  * mode and channel trigger mode by the flags.
 287                  */
 288                 flags = SPRD_DMA_FLAGS(SPRD_DMA_CHN_MODE_NONE, SPRD_DMA_NO_TRG,
 289                                        SPRD_DMA_FRAG_REQ, SPRD_DMA_TRANS_INT);
 290                 data->desc = chan->device->device_prep_slave_sg(chan, sg,
 291                                                                 sg_num, dir,
 292                                                                 flags, &link);
 293                 if (!data->desc) {
 294                         dev_err(component->dev, "failed to prepare slave sg\n");
 295                         ret = -ENOMEM;
 296                         goto config_err;
 297                 }
 298
 299                 if (!runtime->no_period_wakeup) {
 300                         data->desc->callback = sprd_pcm_dma_complete;
 301                         data->desc->callback_param = dma_private;
 302                 }
 303         }
 304
 305         devm_kfree(component->dev, sg);
 306
 307         return 0;
 308
 309 config_err:
 310         devm_kfree(component->dev, sg);
 311 sg_err:
 312         sprd_pcm_release_dma_channel(substream);
 313         return ret;
 314 }
 315
 316 static int sprd_pcm_hw_free(struct snd_pcm_substream *substream)
 317 {
 318         snd_pcm_set_runtime_buffer(substream, NULL);
 319         sprd_pcm_release_dma_channel(substream);
 320
 321         return 0;
 322 }
 323
 324 static int sprd_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 325 {
 326         struct sprd_pcm_dma_private *dma_private =
 327                 substream->runtime->private_data;
 328         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 329         struct snd_soc_component *component =
 330                 snd_soc_rtdcom_lookup(rtd, DRV_NAME);
 331         int ret = 0, i;
 332
 333         switch (cmd) {
 334         case SNDRV_PCM_TRIGGER_START:
 335                 for (i = 0; i < dma_private->hw_chan; i++) {
 336                         struct sprd_pcm_dma_data *data = &dma_private->data[i];
 337
 338                         if (!data->desc)
 339                                 continue;
 340
 341                         data->cookie = dmaengine_submit(data->desc);
 342                         ret = dma_submit_error(data->cookie);
 343                         if (ret) {
 344                                 dev_err(component->dev,
 345                                         "failed to submit dma request: %d\n",
 346                                         ret);
 347                                 return ret;
 348                         }
 349
 350                         dma_async_issue_pending(data->chan);
 351                 }
 352
 353                 break;
 354         case SNDRV_PCM_TRIGGER_RESUME:
 355         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 356                 for (i = 0; i < dma_private->hw_chan; i++) {
 357                         struct sprd_pcm_dma_data *data = &dma_private->data[i];
 358
 359                         if (data->chan)
 360                                 dmaengine_resume(data->chan);
 361                 }
 362
 363                 break;
 364         case SNDRV_PCM_TRIGGER_STOP:
 365                 for (i = 0; i < dma_private->hw_chan; i++) {
 366                         struct sprd_pcm_dma_data *data = &dma_private->data[i];
 367
 368                         if (data->chan)
 369                                 dmaengine_terminate_async(data->chan);
 370                 }
 371
 372                 break;
 373         case SNDRV_PCM_TRIGGER_SUSPEND:
 374         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 375                 for (i = 0; i < dma_private->hw_chan; i++) {
 376                         struct sprd_pcm_dma_data *data = &dma_private->data[i];
 377
 378                         if (data->chan)
 379                                 dmaengine_pause(data->chan);
 380                 }
 381
 382                 break;
 383         default:
 384                 ret = -EINVAL;
 385         }
 386
 387         return ret;
 388 }
 389
 390 static snd_pcm_uframes_t sprd_pcm_pointer(struct snd_pcm_substream *substream)
 391 {
 392         struct snd_pcm_runtime *runtime = substream->runtime;
 393         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 394         struct sprd_pcm_dma_private *dma_private = runtime->private_data;
 395         struct snd_soc_component *component =
 396                 snd_soc_rtdcom_lookup(rtd, DRV_NAME);
 397         int pointer[SPRD_PCM_CHANNEL_MAX];
 398         int bytes_of_pointer = 0, sel_max = 0, i;
 399         snd_pcm_uframes_t x;
 400         struct dma_tx_state state;
 401         enum dma_status status;
 402
 403         for (i = 0; i < dma_private->hw_chan; i++) {
 404                 struct sprd_pcm_dma_data *data = &dma_private->data[i];
 405
 406                 if (!data->chan)
 407                         continue;
 408
 409                 status = dmaengine_tx_status(data->chan, data->cookie, &state);
 410                 if (status == DMA_ERROR) {
 411                         dev_err(component->dev,
 412                                 "failed to get dma channel %d status\n", i);
 413                         return 0;
 414                 }
 415
 416                 /*
 417                  * We just get current transfer address from the DMA engine, so
 418                  * we need convert to current pointer.
 419                  */
 420                 pointer[i] = state.residue - runtime->dma_addr -
 421                         i * dma_private->dma_addr_offset;
 422
 423                 if (i == 0) {
 424                         bytes_of_pointer = pointer[i];
 425                         sel_max = pointer[i] < data->pre_pointer ? 1 : 0;
 426                 } else {
 427                         sel_max ^= pointer[i] < data->pre_pointer ? 1 : 0;
 428
 429                         if (sel_max)
 430                                 bytes_of_pointer =
 431                                         max(pointer[i], pointer[i - 1]) << 1;
 432                         else
 433                                 bytes_of_pointer =
 434                                         min(pointer[i], pointer[i - 1]) << 1;
 435                 }
 436
 437                 data->pre_pointer = pointer[i];
 438         }
 439
 440         x = bytes_to_frames(runtime, bytes_of_pointer);
 441         if (x == runtime->buffer_size)
 442                 x = 0;
 443
 444         return x;
 445 }
 446
 447 static int sprd_pcm_mmap(struct snd_pcm_substream *substream,
 448                          struct vm_area_struct *vma)
 449 {
 450         struct snd_pcm_runtime *runtime = substream->runtime;
 451
 452         vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
 453         return remap_pfn_range(vma, vma->vm_start,
 454                                runtime->dma_addr >> PAGE_SHIFT,
 455                                vma->vm_end - vma->vm_start,
 456                                vma->vm_page_prot);
 457 }
 458
 459 static struct snd_pcm_ops sprd_pcm_ops = {
 460         .open = sprd_pcm_open,
 461         .close = sprd_pcm_close,
 462         .ioctl = snd_pcm_lib_ioctl,
 463         .hw_params = sprd_pcm_hw_params,
 464         .hw_free = sprd_pcm_hw_free,
 465         .trigger = sprd_pcm_trigger,
 466         .pointer = sprd_pcm_pointer,
 467         .mmap = sprd_pcm_mmap,
 468 };
 469
 470 static int sprd_pcm_new(struct snd_soc_pcm_runtime *rtd)
 471 {
 472         struct snd_card *card = rtd->card->snd_card;
 473         struct snd_pcm *pcm = rtd->pcm;
 474         struct snd_pcm_substream *substream;
 475         int ret;
 476
 477         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 478         if (ret)
 479                 return ret;
 480
 481         substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
 482         if (substream) {
 483                 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, card->dev,
 484                                           sprd_pcm_hardware.buffer_bytes_max,
 485                                           &substream->dma_buffer);
 486                 if (ret) {
 487                         dev_err(card->dev,
 488                                 "can't alloc playback dma buffer: %d\n", ret);
 489                         return ret;
 490                 }
 491         }
 492
 493         substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
 494         if (substream) {
 495                 ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, card->dev,
 496                                           sprd_pcm_hardware.buffer_bytes_max,
 497                                           &substream->dma_buffer);
 498                 if (ret) {
 499                         dev_err(card->dev,
 500                                 "can't alloc capture dma buffer: %d\n", ret);
 501                         snd_dma_free_pages(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer);
 502                         return ret;
 503                 }
 504         }
 505
 506         return 0;
 507 }
 508
 509 static void sprd_pcm_free(struct snd_pcm *pcm)
 510 {
 511         struct snd_pcm_substream *substream;
 512         int i;
 513
 514         for (i = 0; i < ARRAY_SIZE(pcm->streams); i++) {
 515                 substream = pcm->streams[i].substream;
 516                 if (substream) {
 517                         snd_dma_free_pages(&substream->dma_buffer);
 518                         substream->dma_buffer.area = NULL;
 519                         substream->dma_buffer.addr = 0;
 520                 }
 521         }
 522 }
 523
 524 static const struct snd_soc_component_driver sprd_soc_component = {
 525         .name           = DRV_NAME,
 526         .ops            = &sprd_pcm_ops,
 527         .compr_ops      = &sprd_platform_compr_ops,
 528         .pcm_new        = sprd_pcm_new,
 529         .pcm_free       = sprd_pcm_free,
 530 };
 531
 532 static int sprd_soc_platform_probe(struct platform_device *pdev)
 533 {
 534         struct device_node *np = pdev->dev.of_node;
 535         int ret;
 536
 537         ret = of_reserved_mem_device_init_by_idx(&pdev->dev, np, 0);
 538         if (ret)
 539                 dev_warn(&pdev->dev,
 540                          "no reserved DMA memory for audio platform device\n");
 541
 542         ret = devm_snd_soc_register_component(&pdev->dev, &sprd_soc_component,
 543                                               NULL, 0);
 544         if (ret)
 545                 dev_err(&pdev->dev, "could not register platform:%d\n", ret);
 546
 547         return ret;
 548 }
 549
 550 static const struct of_device_id sprd_pcm_of_match[] = {
 551         { .compatible = "sprd,pcm-platform", },
 552         { },
 553 };
 554 MODULE_DEVICE_TABLE(of, sprd_pcm_of_match);
 555
 556 static struct platform_driver sprd_pcm_driver = {
 557         .driver = {
 558                 .name = "sprd-pcm-audio",
 559                 .of_match_table = sprd_pcm_of_match,
 560         },
 561
 562         .probe = sprd_soc_platform_probe,
 563 };
 564
 565 module_platform_driver(sprd_pcm_driver);
 566
 567 MODULE_DESCRIPTION("Spreadtrum ASoC PCM DMA");
 568 MODULE_LICENSE("GPL v2");
 569 MODULE_ALIAS("platform:sprd-audio");