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Linux/sound/soc/ti/davinci-vcif.c

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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 
 10 #include <linux/init.h>
 11 #include <linux/module.h>
 12 #include <linux/device.h>
 13 #include <linux/delay.h>
 14 #include <linux/slab.h>
 15 #include <linux/io.h>
 16 #include <linux/mfd/davinci_voicecodec.h>
 17 
 18 #include <sound/core.h>
 19 #include <sound/pcm.h>
 20 #include <sound/pcm_params.h>
 21 #include <sound/initval.h>
 22 #include <sound/soc.h>
 23 #include <sound/dmaengine_pcm.h>
 24 
 25 #include "edma-pcm.h"
 26 #include "davinci-i2s.h"
 27 
 28 #define MOD_REG_BIT(val, mask, set) do { \
 29         if (set) { \
 30                 val |= mask; \
 31         } else { \
 32                 val &= ~mask; \
 33         } \
 34 } while (0)
 35 
 36 struct davinci_vcif_dev {
 37         struct davinci_vc *davinci_vc;
 38         struct snd_dmaengine_dai_dma_data dma_data[2];
 39         int dma_request[2];
 40 };
 41 
 42 static void davinci_vcif_start(struct snd_pcm_substream *substream)
 43 {
 44         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 45         struct davinci_vcif_dev *davinci_vcif_dev =
 46                         snd_soc_dai_get_drvdata(rtd->cpu_dai);
 47         struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
 48         u32 w;
 49 
 50         /* Start the sample generator and enable transmitter/receiver */
 51         w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
 52 
 53         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 54                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 0);
 55         else
 56                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 0);
 57 
 58         writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
 59 }
 60 
 61 static void davinci_vcif_stop(struct snd_pcm_substream *substream)
 62 {
 63         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 64         struct davinci_vcif_dev *davinci_vcif_dev =
 65                         snd_soc_dai_get_drvdata(rtd->cpu_dai);
 66         struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
 67         u32 w;
 68 
 69         /* Reset transmitter/receiver and sample rate/frame sync generators */
 70         w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
 71         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 72                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 1);
 73         else
 74                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 1);
 75 
 76         writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
 77 }
 78 
 79 static int davinci_vcif_hw_params(struct snd_pcm_substream *substream,
 80                                   struct snd_pcm_hw_params *params,
 81                                   struct snd_soc_dai *dai)
 82 {
 83         struct davinci_vcif_dev *davinci_vcif_dev = snd_soc_dai_get_drvdata(dai);
 84         struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
 85         u32 w;
 86 
 87         /* Restart the codec before setup */
 88         davinci_vcif_stop(substream);
 89         davinci_vcif_start(substream);
 90 
 91         /* General line settings */
 92         writel(DAVINCI_VC_CTRL_MASK, davinci_vc->base + DAVINCI_VC_CTRL);
 93 
 94         writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTCLR);
 95 
 96         writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTEN);
 97 
 98         w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
 99 
100         /* Determine xfer data type */
101         switch (params_format(params)) {
102         case SNDRV_PCM_FORMAT_U8:
103                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
104                             DAVINCI_VC_CTRL_RD_UNSIGNED |
105                             DAVINCI_VC_CTRL_WD_BITS_8 |
106                             DAVINCI_VC_CTRL_WD_UNSIGNED, 1);
107                 break;
108         case SNDRV_PCM_FORMAT_S8:
109                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
110                             DAVINCI_VC_CTRL_WD_BITS_8, 1);
111 
112                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_UNSIGNED |
113                             DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
114                 break;
115         case SNDRV_PCM_FORMAT_S16_LE:
116                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
117                             DAVINCI_VC_CTRL_RD_UNSIGNED |
118                             DAVINCI_VC_CTRL_WD_BITS_8 |
119                             DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
120                 break;
121         default:
122                 printk(KERN_WARNING "davinci-vcif: unsupported PCM format");
123                 return -EINVAL;
124         }
125 
126         writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
127 
128         return 0;
129 }
130 
131 static int davinci_vcif_trigger(struct snd_pcm_substream *substream, int cmd,
132                                 struct snd_soc_dai *dai)
133 {
134         int ret = 0;
135 
136         switch (cmd) {
137         case SNDRV_PCM_TRIGGER_START:
138         case SNDRV_PCM_TRIGGER_RESUME:
139         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
140                 davinci_vcif_start(substream);
141                 break;
142         case SNDRV_PCM_TRIGGER_STOP:
143         case SNDRV_PCM_TRIGGER_SUSPEND:
144         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
145                 davinci_vcif_stop(substream);
146                 break;
147         default:
148                 ret = -EINVAL;
149         }
150 
151         return ret;
152 }
153 
154 #define DAVINCI_VCIF_RATES      SNDRV_PCM_RATE_8000_48000
155 
156 static const struct snd_soc_dai_ops davinci_vcif_dai_ops = {
157         .trigger        = davinci_vcif_trigger,
158         .hw_params      = davinci_vcif_hw_params,
159 };
160 
161 static int davinci_vcif_dai_probe(struct snd_soc_dai *dai)
162 {
163         struct davinci_vcif_dev *dev = snd_soc_dai_get_drvdata(dai);
164 
165         dai->playback_dma_data = &dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK];
166         dai->capture_dma_data = &dev->dma_data[SNDRV_PCM_STREAM_CAPTURE];
167 
168         return 0;
169 }
170 
171 static struct snd_soc_dai_driver davinci_vcif_dai = {
172         .probe = davinci_vcif_dai_probe,
173         .playback = {
174                 .channels_min = 1,
175                 .channels_max = 2,
176                 .rates = DAVINCI_VCIF_RATES,
177                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
178         .capture = {
179                 .channels_min = 1,
180                 .channels_max = 2,
181                 .rates = DAVINCI_VCIF_RATES,
182                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
183         .ops = &davinci_vcif_dai_ops,
184 
185 };
186 
187 static const struct snd_soc_component_driver davinci_vcif_component = {
188         .name           = "davinci-vcif",
189 };
190 
191 static int davinci_vcif_probe(struct platform_device *pdev)
192 {
193         struct davinci_vc *davinci_vc = pdev->dev.platform_data;
194         struct davinci_vcif_dev *davinci_vcif_dev;
195         int ret;
196 
197         davinci_vcif_dev = devm_kzalloc(&pdev->dev,
198                                         sizeof(struct davinci_vcif_dev),
199                                         GFP_KERNEL);
200         if (!davinci_vcif_dev)
201                 return -ENOMEM;
202 
203         /* DMA tx params */
204         davinci_vcif_dev->davinci_vc = davinci_vc;
205         davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].filter_data =
206                                 &davinci_vc->davinci_vcif.dma_tx_channel;
207         davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].addr =
208                                 davinci_vc->davinci_vcif.dma_tx_addr;
209 
210         /* DMA rx params */
211         davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].filter_data =
212                                 &davinci_vc->davinci_vcif.dma_rx_channel;
213         davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].addr =
214                                 davinci_vc->davinci_vcif.dma_rx_addr;
215 
216         dev_set_drvdata(&pdev->dev, davinci_vcif_dev);
217 
218         ret = devm_snd_soc_register_component(&pdev->dev,
219                                               &davinci_vcif_component,
220                                               &davinci_vcif_dai, 1);
221         if (ret != 0) {
222                 dev_err(&pdev->dev, "could not register dai\n");
223                 return ret;
224         }
225 
226         ret = edma_pcm_platform_register(&pdev->dev);
227         if (ret) {
228                 dev_err(&pdev->dev, "register PCM failed: %d\n", ret);
229                 return ret;
230         }
231 
232         return 0;
233 }
234 
235 static struct platform_driver davinci_vcif_driver = {
236         .probe          = davinci_vcif_probe,
237         .driver         = {
238                 .name   = "davinci-vcif",
239         },
240 };
241 
242 module_platform_driver(davinci_vcif_driver);
243 
244 MODULE_AUTHOR("Miguel Aguilar");
245 MODULE_DESCRIPTION("Texas Instruments DaVinci ASoC Voice Codec Interface");
246 MODULE_LICENSE("GPL");
247 

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