davinci-vcif.c 6.4 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * ALSA SoC Voice Codec Interface for TI DAVINCI processor
  4. *
  5. * Copyright (C) 2010 Texas Instruments.
  6. *
  7. * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
  8. */
  9. #include <linux/init.h>
  10. #include <linux/module.h>
  11. #include <linux/device.h>
  12. #include <linux/delay.h>
  13. #include <linux/slab.h>
  14. #include <linux/io.h>
  15. #include <linux/mfd/davinci_voicecodec.h>
  16. #include <sound/core.h>
  17. #include <sound/pcm.h>
  18. #include <sound/pcm_params.h>
  19. #include <sound/initval.h>
  20. #include <sound/soc.h>
  21. #include <sound/dmaengine_pcm.h>
  22. #include "edma-pcm.h"
  23. #include "davinci-i2s.h"
  24. #define MOD_REG_BIT(val, mask, set) do { \
  25. if (set) { \
  26. val |= mask; \
  27. } else { \
  28. val &= ~mask; \
  29. } \
  30. } while (0)
  31. struct davinci_vcif_dev {
  32. struct davinci_vc *davinci_vc;
  33. struct snd_dmaengine_dai_dma_data dma_data[2];
  34. int dma_request[2];
  35. };
  36. static void davinci_vcif_start(struct snd_pcm_substream *substream)
  37. {
  38. struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
  39. struct davinci_vcif_dev *davinci_vcif_dev =
  40. snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0));
  41. struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
  42. u32 w;
  43. /* Start the sample generator and enable transmitter/receiver */
  44. w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
  45. if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  46. MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 0);
  47. else
  48. MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 0);
  49. writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
  50. }
  51. static void davinci_vcif_stop(struct snd_pcm_substream *substream)
  52. {
  53. struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
  54. struct davinci_vcif_dev *davinci_vcif_dev =
  55. snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0));
  56. struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
  57. u32 w;
  58. /* Reset transmitter/receiver and sample rate/frame sync generators */
  59. w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
  60. if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  61. MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 1);
  62. else
  63. MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 1);
  64. writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
  65. }
  66. static int davinci_vcif_hw_params(struct snd_pcm_substream *substream,
  67. struct snd_pcm_hw_params *params,
  68. struct snd_soc_dai *dai)
  69. {
  70. struct davinci_vcif_dev *davinci_vcif_dev = snd_soc_dai_get_drvdata(dai);
  71. struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
  72. u32 w;
  73. /* Restart the codec before setup */
  74. davinci_vcif_stop(substream);
  75. davinci_vcif_start(substream);
  76. /* General line settings */
  77. writel(DAVINCI_VC_CTRL_MASK, davinci_vc->base + DAVINCI_VC_CTRL);
  78. writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTCLR);
  79. writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTEN);
  80. w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
  81. /* Determine xfer data type */
  82. switch (params_format(params)) {
  83. case SNDRV_PCM_FORMAT_U8:
  84. MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
  85. DAVINCI_VC_CTRL_RD_UNSIGNED |
  86. DAVINCI_VC_CTRL_WD_BITS_8 |
  87. DAVINCI_VC_CTRL_WD_UNSIGNED, 1);
  88. break;
  89. case SNDRV_PCM_FORMAT_S8:
  90. MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
  91. DAVINCI_VC_CTRL_WD_BITS_8, 1);
  92. MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_UNSIGNED |
  93. DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
  94. break;
  95. case SNDRV_PCM_FORMAT_S16_LE:
  96. MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
  97. DAVINCI_VC_CTRL_RD_UNSIGNED |
  98. DAVINCI_VC_CTRL_WD_BITS_8 |
  99. DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
  100. break;
  101. default:
  102. printk(KERN_WARNING "davinci-vcif: unsupported PCM format");
  103. return -EINVAL;
  104. }
  105. writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
  106. return 0;
  107. }
  108. static int davinci_vcif_trigger(struct snd_pcm_substream *substream, int cmd,
  109. struct snd_soc_dai *dai)
  110. {
  111. int ret = 0;
  112. switch (cmd) {
  113. case SNDRV_PCM_TRIGGER_START:
  114. case SNDRV_PCM_TRIGGER_RESUME:
  115. case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
  116. davinci_vcif_start(substream);
  117. break;
  118. case SNDRV_PCM_TRIGGER_STOP:
  119. case SNDRV_PCM_TRIGGER_SUSPEND:
  120. case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
  121. davinci_vcif_stop(substream);
  122. break;
  123. default:
  124. ret = -EINVAL;
  125. }
  126. return ret;
  127. }
  128. #define DAVINCI_VCIF_RATES SNDRV_PCM_RATE_8000_48000
  129. static const struct snd_soc_dai_ops davinci_vcif_dai_ops = {
  130. .trigger = davinci_vcif_trigger,
  131. .hw_params = davinci_vcif_hw_params,
  132. };
  133. static int davinci_vcif_dai_probe(struct snd_soc_dai *dai)
  134. {
  135. struct davinci_vcif_dev *dev = snd_soc_dai_get_drvdata(dai);
  136. dai->playback_dma_data = &dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK];
  137. dai->capture_dma_data = &dev->dma_data[SNDRV_PCM_STREAM_CAPTURE];
  138. return 0;
  139. }
  140. static struct snd_soc_dai_driver davinci_vcif_dai = {
  141. .probe = davinci_vcif_dai_probe,
  142. .playback = {
  143. .channels_min = 1,
  144. .channels_max = 2,
  145. .rates = DAVINCI_VCIF_RATES,
  146. .formats = SNDRV_PCM_FMTBIT_S16_LE,},
  147. .capture = {
  148. .channels_min = 1,
  149. .channels_max = 2,
  150. .rates = DAVINCI_VCIF_RATES,
  151. .formats = SNDRV_PCM_FMTBIT_S16_LE,},
  152. .ops = &davinci_vcif_dai_ops,
  153. };
  154. static const struct snd_soc_component_driver davinci_vcif_component = {
  155. .name = "davinci-vcif",
  156. };
  157. static int davinci_vcif_probe(struct platform_device *pdev)
  158. {
  159. struct davinci_vc *davinci_vc = pdev->dev.platform_data;
  160. struct davinci_vcif_dev *davinci_vcif_dev;
  161. int ret;
  162. davinci_vcif_dev = devm_kzalloc(&pdev->dev,
  163. sizeof(struct davinci_vcif_dev),
  164. GFP_KERNEL);
  165. if (!davinci_vcif_dev)
  166. return -ENOMEM;
  167. /* DMA tx params */
  168. davinci_vcif_dev->davinci_vc = davinci_vc;
  169. davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].filter_data =
  170. &davinci_vc->davinci_vcif.dma_tx_channel;
  171. davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].addr =
  172. davinci_vc->davinci_vcif.dma_tx_addr;
  173. /* DMA rx params */
  174. davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].filter_data =
  175. &davinci_vc->davinci_vcif.dma_rx_channel;
  176. davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].addr =
  177. davinci_vc->davinci_vcif.dma_rx_addr;
  178. dev_set_drvdata(&pdev->dev, davinci_vcif_dev);
  179. ret = devm_snd_soc_register_component(&pdev->dev,
  180. &davinci_vcif_component,
  181. &davinci_vcif_dai, 1);
  182. if (ret != 0) {
  183. dev_err(&pdev->dev, "could not register dai\n");
  184. return ret;
  185. }
  186. ret = edma_pcm_platform_register(&pdev->dev);
  187. if (ret) {
  188. dev_err(&pdev->dev, "register PCM failed: %d\n", ret);
  189. return ret;
  190. }
  191. return 0;
  192. }
  193. static struct platform_driver davinci_vcif_driver = {
  194. .probe = davinci_vcif_probe,
  195. .driver = {
  196. .name = "davinci-vcif",
  197. },
  198. };
  199. module_platform_driver(davinci_vcif_driver);
  200. MODULE_AUTHOR("Miguel Aguilar");
  201. MODULE_DESCRIPTION("Texas Instruments DaVinci ASoC Voice Codec Interface");
  202. MODULE_LICENSE("GPL");