sdma-pcm.c 1.9 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com
  4. * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
  5. */
  6. #include <linux/device.h>
  7. #include <linux/module.h>
  8. #include <sound/core.h>
  9. #include <sound/pcm.h>
  10. #include <sound/pcm_params.h>
  11. #include <sound/soc.h>
  12. #include <sound/dmaengine_pcm.h>
  13. #include "sdma-pcm.h"
  14. static const struct snd_pcm_hardware sdma_pcm_hardware = {
  15. .info = SNDRV_PCM_INFO_MMAP |
  16. SNDRV_PCM_INFO_MMAP_VALID |
  17. SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |
  18. SNDRV_PCM_INFO_NO_PERIOD_WAKEUP |
  19. SNDRV_PCM_INFO_INTERLEAVED,
  20. .period_bytes_min = 32,
  21. .period_bytes_max = 64 * 1024,
  22. .buffer_bytes_max = 128 * 1024,
  23. .periods_min = 2,
  24. .periods_max = 255,
  25. };
  26. static const struct snd_dmaengine_pcm_config sdma_dmaengine_pcm_config = {
  27. .pcm_hardware = &sdma_pcm_hardware,
  28. .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
  29. .prealloc_buffer_size = 128 * 1024,
  30. };
  31. int sdma_pcm_platform_register(struct device *dev,
  32. char *txdmachan, char *rxdmachan)
  33. {
  34. struct snd_dmaengine_pcm_config *config;
  35. unsigned int flags = 0;
  36. /* Standard names for the directions: 'tx' and 'rx' */
  37. if (!txdmachan && !rxdmachan)
  38. return devm_snd_dmaengine_pcm_register(dev,
  39. &sdma_dmaengine_pcm_config, 0);
  40. config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL);
  41. if (!config)
  42. return -ENOMEM;
  43. *config = sdma_dmaengine_pcm_config;
  44. if (!txdmachan || !rxdmachan) {
  45. /* One direction only PCM */
  46. flags |= SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX;
  47. if (!txdmachan) {
  48. txdmachan = rxdmachan;
  49. rxdmachan = NULL;
  50. }
  51. }
  52. config->chan_names[0] = txdmachan;
  53. config->chan_names[1] = rxdmachan;
  54. return devm_snd_dmaengine_pcm_register(dev, config, flags);
  55. }
  56. EXPORT_SYMBOL_GPL(sdma_pcm_platform_register);
  57. MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
  58. MODULE_DESCRIPTION("sDMA PCM ASoC platform driver");
  59. MODULE_LICENSE("GPL v2");