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
  37 #include "davinci-pcm.h"
  38 #include "davinci-i2s.h"
  39
  40 #define MOD_REG_BIT(val, mask, set) do { \
  41         if (set) { \
  42                 val |= mask; \
  43         } else { \
  44                 val &= ~mask; \
  45         } \
  46 } while (0)
  47
  48 struct davinci_vcif_dev {
  49         struct davinci_vc *davinci_vc;
  50         struct davinci_pcm_dma_params   dma_params[2];
  51 };
  52
  53 static void davinci_vcif_start(struct snd_pcm_substream *substream)
  54 {
  55         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  56         struct davinci_vcif_dev *davinci_vcif_dev =
  57                         snd_soc_dai_get_drvdata(rtd->cpu_dai);
  58         struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
  59         u32 w;
  60
  61         /* Start the sample generator and enable transmitter/receiver */
  62         w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
  63
  64         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  65                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 0);
  66         else
  67                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 0);
  68
  69         writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
  70 }
  71
  72 static void davinci_vcif_stop(struct snd_pcm_substream *substream)
  73 {
  74         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  75         struct davinci_vcif_dev *davinci_vcif_dev =
  76                         snd_soc_dai_get_drvdata(rtd->cpu_dai);
  77         struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
  78         u32 w;
  79
  80         /* Reset transmitter/receiver and sample rate/frame sync generators */
  81         w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
  82         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  83                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 1);
  84         else
  85                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 1);
  86
  87         writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
  88 }
  89
  90 static int davinci_vcif_hw_params(struct snd_pcm_substream *substream,
  91                                   struct snd_pcm_hw_params *params,
  92                                   struct snd_soc_dai *dai)
  93 {
  94         struct davinci_vcif_dev *davinci_vcif_dev = snd_soc_dai_get_drvdata(dai);
  95         struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
  96         struct davinci_pcm_dma_params *dma_params =
  97                         &davinci_vcif_dev->dma_params[substream->stream];
  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                 dma_params->data_type = 0;
 117
 118                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
 119                             DAVINCI_VC_CTRL_RD_UNSIGNED |
 120                             DAVINCI_VC_CTRL_WD_BITS_8 |
 121                             DAVINCI_VC_CTRL_WD_UNSIGNED, 1);
 122                 break;
 123         case SNDRV_PCM_FORMAT_S8:
 124                 dma_params->data_type = 1;
 125
 126                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
 127                             DAVINCI_VC_CTRL_WD_BITS_8, 1);
 128
 129                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_UNSIGNED |
 130                             DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
 131                 break;
 132         case SNDRV_PCM_FORMAT_S16_LE:
 133                 dma_params->data_type = 2;
 134
 135                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
 136                             DAVINCI_VC_CTRL_RD_UNSIGNED |
 137                             DAVINCI_VC_CTRL_WD_BITS_8 |
 138                             DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
 139                 break;
 140         default:
 141                 printk(KERN_WARNING "davinci-vcif: unsupported PCM format");
 142                 return -EINVAL;
 143         }
 144
 145         dma_params->acnt  = dma_params->data_type;
 146
 147         writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
 148
 149         return 0;
 150 }
 151
 152 static int davinci_vcif_trigger(struct snd_pcm_substream *substream, int cmd,
 153                                 struct snd_soc_dai *dai)
 154 {
 155         int ret = 0;
 156
 157         switch (cmd) {
 158         case SNDRV_PCM_TRIGGER_START:
 159         case SNDRV_PCM_TRIGGER_RESUME:
 160         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 161                 davinci_vcif_start(substream);
 162                 break;
 163         case SNDRV_PCM_TRIGGER_STOP:
 164         case SNDRV_PCM_TRIGGER_SUSPEND:
 165         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 166                 davinci_vcif_stop(substream);
 167                 break;
 168         default:
 169                 ret = -EINVAL;
 170         }
 171
 172         return ret;
 173 }
 174
 175 static int davinci_vcif_startup(struct snd_pcm_substream *substream,
 176                                 struct snd_soc_dai *dai)
 177 {
 178         struct davinci_vcif_dev *dev = snd_soc_dai_get_drvdata(dai);
 179
 180         snd_soc_dai_set_dma_data(dai, substream, dev->dma_params);
 181         return 0;
 182 }
 183
 184 #define DAVINCI_VCIF_RATES      SNDRV_PCM_RATE_8000_48000
 185
 186 static const struct snd_soc_dai_ops davinci_vcif_dai_ops = {
 187         .startup        = davinci_vcif_startup,
 188         .trigger        = davinci_vcif_trigger,
 189         .hw_params      = davinci_vcif_hw_params,
 190 };
 191
 192 static struct snd_soc_dai_driver davinci_vcif_dai = {
 193         .playback = {
 194                 .channels_min = 1,
 195                 .channels_max = 2,
 196                 .rates = DAVINCI_VCIF_RATES,
 197                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 198         .capture = {
 199                 .channels_min = 1,
 200                 .channels_max = 2,
 201                 .rates = DAVINCI_VCIF_RATES,
 202                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 203         .ops = &davinci_vcif_dai_ops,
 204
 205 };
 206
 207 static int davinci_vcif_probe(struct platform_device *pdev)
 208 {
 209         struct davinci_vc *davinci_vc = pdev->dev.platform_data;
 210         struct davinci_vcif_dev *davinci_vcif_dev;
 211         int ret;
 212
 213         davinci_vcif_dev = devm_kzalloc(&pdev->dev,
 214                                         sizeof(struct davinci_vcif_dev),
 215                                         GFP_KERNEL);
 216         if (!davinci_vcif_dev) {
 217                 dev_dbg(&pdev->dev,
 218                         "could not allocate memory for private data\n");
 219                 return -ENOMEM;
 220         }
 221
 222         /* DMA tx params */
 223         davinci_vcif_dev->davinci_vc = davinci_vc;
 224         davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK].channel =
 225                                         davinci_vc->davinci_vcif.dma_tx_channel;
 226         davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK].dma_addr =
 227                                         davinci_vc->davinci_vcif.dma_tx_addr;
 228
 229         /* DMA rx params */
 230         davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].channel =
 231                                         davinci_vc->davinci_vcif.dma_rx_channel;
 232         davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].dma_addr =
 233                                         davinci_vc->davinci_vcif.dma_rx_addr;
 234
 235         dev_set_drvdata(&pdev->dev, davinci_vcif_dev);
 236
 237         ret = snd_soc_register_dai(&pdev->dev, &davinci_vcif_dai);
 238         if (ret != 0) {
 239                 dev_err(&pdev->dev, "could not register dai\n");
 240                 return ret;
 241         }
 242
 243         return 0;
 244 }
 245
 246 static int davinci_vcif_remove(struct platform_device *pdev)
 247 {
 248         snd_soc_unregister_dai(&pdev->dev);
 249
 250         return 0;
 251 }
 252
 253 static struct platform_driver davinci_vcif_driver = {
 254         .probe          = davinci_vcif_probe,
 255         .remove         = davinci_vcif_remove,
 256         .driver         = {
 257                 .name   = "davinci-vcif",
 258                 .owner  = THIS_MODULE,
 259         },
 260 };
 261
 262 module_platform_driver(davinci_vcif_driver);
 263
 264 MODULE_AUTHOR("Miguel Aguilar");
 265 MODULE_DESCRIPTION("Texas Instruments DaVinci ASoC Voice Codec Interface");
 266 MODULE_LICENSE("GPL");