sound/soc/davinci/davinci-vcif.c

   1 /*
   2  * ALSA SoC Voice Codec Interface for TI DAVINCI processor
   3  *
   4  * Copyright (C) 2010 Texas Instruments.
   5  *
   6  * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  */
  22
  23 #include <linux/init.h>
  24 #include <linux/module.h>
  25 #include <linux/device.h>
  26 #include <linux/delay.h>
  27 #include <linux/slab.h>
  28 #include <linux/io.h>
  29 #include <linux/mfd/davinci_voicecodec.h>
  30
  31 #include <sound/core.h>
  32 #include <sound/pcm.h>
  33 #include <sound/pcm_params.h>
  34 #include <sound/initval.h>
  35 #include <sound/soc.h>
  36 #include <sound/dmaengine_pcm.h>
  37
  38 #include "edma-pcm.h"
  39 #include "davinci-i2s.h"
  40
  41 #define MOD_REG_BIT(val, mask, set) do { \
  42         if (set) { \
  43                 val |= mask; \
  44         } else { \
  45                 val &= ~mask; \
  46         } \
  47 } while (0)
  48
  49 struct davinci_vcif_dev {
  50         struct davinci_vc *davinci_vc;
  51         struct snd_dmaengine_dai_dma_data dma_data[2];
  52         int dma_request[2];
  53 };
  54
  55 static void davinci_vcif_start(struct snd_pcm_substream *substream)
  56 {
  57         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  58         struct davinci_vcif_dev *davinci_vcif_dev =
  59                         snd_soc_dai_get_drvdata(rtd->cpu_dai);
  60         struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
  61         u32 w;
  62
  63         /* Start the sample generator and enable transmitter/receiver */
  64         w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
  65
  66         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  67                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 0);
  68         else
  69                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 0);
  70
  71         writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
  72 }
  73
  74 static void davinci_vcif_stop(struct snd_pcm_substream *substream)
  75 {
  76         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  77         struct davinci_vcif_dev *davinci_vcif_dev =
  78                         snd_soc_dai_get_drvdata(rtd->cpu_dai);
  79         struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
  80         u32 w;
  81
  82         /* Reset transmitter/receiver and sample rate/frame sync generators */
  83         w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
  84         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  85                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 1);
  86         else
  87                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 1);
  88
  89         writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
  90 }
  91
  92 static int davinci_vcif_hw_params(struct snd_pcm_substream *substream,
  93                                   struct snd_pcm_hw_params *params,
  94                                   struct snd_soc_dai *dai)
  95 {
  96         struct davinci_vcif_dev *davinci_vcif_dev = snd_soc_dai_get_drvdata(dai);
  97         struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
  98         u32 w;
  99
 100         /* Restart the codec before setup */
 101         davinci_vcif_stop(substream);
 102         davinci_vcif_start(substream);
 103
 104         /* General line settings */
 105         writel(DAVINCI_VC_CTRL_MASK, davinci_vc->base + DAVINCI_VC_CTRL);
 106
 107         writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTCLR);
 108
 109         writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTEN);
 110
 111         w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
 112
 113         /* Determine xfer data type */
 114         switch (params_format(params)) {
 115         case SNDRV_PCM_FORMAT_U8:
 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, 1);
 120                 break;
 121         case SNDRV_PCM_FORMAT_S8:
 122                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
 123                             DAVINCI_VC_CTRL_WD_BITS_8, 1);
 124
 125                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_UNSIGNED |
 126                             DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
 127                 break;
 128         case SNDRV_PCM_FORMAT_S16_LE:
 129                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
 130                             DAVINCI_VC_CTRL_RD_UNSIGNED |
 131                             DAVINCI_VC_CTRL_WD_BITS_8 |
 132                             DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
 133                 break;
 134         default:
 135                 printk(KERN_WARNING "davinci-vcif: unsupported PCM format");
 136                 return -EINVAL;
 137         }
 138
 139         writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
 140
 141         return 0;
 142 }
 143
 144 static int davinci_vcif_trigger(struct snd_pcm_substream *substream, int cmd,
 145                                 struct snd_soc_dai *dai)
 146 {
 147         int ret = 0;
 148
 149         switch (cmd) {
 150         case SNDRV_PCM_TRIGGER_START:
 151         case SNDRV_PCM_TRIGGER_RESUME:
 152         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 153                 davinci_vcif_start(substream);
 154                 break;
 155         case SNDRV_PCM_TRIGGER_STOP:
 156         case SNDRV_PCM_TRIGGER_SUSPEND:
 157         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 158                 davinci_vcif_stop(substream);
 159                 break;
 160         default:
 161                 ret = -EINVAL;
 162         }
 163
 164         return ret;
 165 }
 166
 167 #define DAVINCI_VCIF_RATES      SNDRV_PCM_RATE_8000_48000
 168
 169 static const struct snd_soc_dai_ops davinci_vcif_dai_ops = {
 170         .trigger        = davinci_vcif_trigger,
 171         .hw_params      = davinci_vcif_hw_params,
 172 };
 173
 174 static int davinci_vcif_dai_probe(struct snd_soc_dai *dai)
 175 {
 176         struct davinci_vcif_dev *dev = snd_soc_dai_get_drvdata(dai);
 177
 178         dai->playback_dma_data = &dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK];
 179         dai->capture_dma_data = &dev->dma_data[SNDRV_PCM_STREAM_CAPTURE];
 180
 181         return 0;
 182 }
 183
 184 static struct snd_soc_dai_driver davinci_vcif_dai = {
 185         .probe = davinci_vcif_dai_probe,
 186         .playback = {
 187                 .channels_min = 1,
 188                 .channels_max = 2,
 189                 .rates = DAVINCI_VCIF_RATES,
 190                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 191         .capture = {
 192                 .channels_min = 1,
 193                 .channels_max = 2,
 194                 .rates = DAVINCI_VCIF_RATES,
 195                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 196         .ops = &davinci_vcif_dai_ops,
 197
 198 };
 199
 200 static const struct snd_soc_component_driver davinci_vcif_component = {
 201         .name           = "davinci-vcif",
 202 };
 203
 204 static int davinci_vcif_probe(struct platform_device *pdev)
 205 {
 206         struct davinci_vc *davinci_vc = pdev->dev.platform_data;
 207         struct davinci_vcif_dev *davinci_vcif_dev;
 208         int ret;
 209
 210         davinci_vcif_dev = devm_kzalloc(&pdev->dev,
 211                                         sizeof(struct davinci_vcif_dev),
 212                                         GFP_KERNEL);
 213         if (!davinci_vcif_dev) {
 214                 dev_dbg(&pdev->dev,
 215                         "could not allocate memory for private data\n");
 216                 return -ENOMEM;
 217         }
 218
 219         /* DMA tx params */
 220         davinci_vcif_dev->davinci_vc = davinci_vc;
 221         davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].filter_data =
 222                                 &davinci_vc->davinci_vcif.dma_tx_channel;
 223         davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].addr =
 224                                 davinci_vc->davinci_vcif.dma_tx_addr;
 225
 226         /* DMA rx params */
 227         davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].filter_data =
 228                                 &davinci_vc->davinci_vcif.dma_rx_channel;
 229         davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].addr =
 230                                 davinci_vc->davinci_vcif.dma_rx_addr;
 231
 232         dev_set_drvdata(&pdev->dev, davinci_vcif_dev);
 233
 234         ret = devm_snd_soc_register_component(&pdev->dev,
 235                                               &davinci_vcif_component,
 236                                               &davinci_vcif_dai, 1);
 237         if (ret != 0) {
 238                 dev_err(&pdev->dev, "could not register dai\n");
 239                 return ret;
 240         }
 241
 242         ret = edma_pcm_platform_register(&pdev->dev);
 243         if (ret) {
 244                 dev_err(&pdev->dev, "register PCM failed: %d\n", ret);
 245                 return ret;
 246         }
 247
 248         return 0;
 249 }
 250
 251 static struct platform_driver davinci_vcif_driver = {
 252         .probe          = davinci_vcif_probe,
 253         .driver         = {
 254                 .name   = "davinci-vcif",
 255         },
 256 };
 257
 258 module_platform_driver(davinci_vcif_driver);
 259
 260 MODULE_AUTHOR("Miguel Aguilar");
 261 MODULE_DESCRIPTION("Texas Instruments DaVinci ASoC Voice Codec Interface");
 262 MODULE_LICENSE("GPL");