sound/soc/ti/davinci-vcif.c

   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");