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, 1);
  66         else
  67                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 1);
  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, 0);
  84         else
  85                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 0);
  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         case SNDRV_PCM_TRIGGER_STOP:
 163         case SNDRV_PCM_TRIGGER_SUSPEND:
 164         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 165                 davinci_vcif_stop(substream);
 166                 break;
 167         default:
 168                 ret = -EINVAL;
 169         }
 170
 171         return ret;
 172 }
 173
 174 static int davinci_vcif_startup(struct snd_pcm_substream *substream,
 175                                 struct snd_soc_dai *dai)
 176 {
 177         struct davinci_vcif_dev *dev = snd_soc_dai_get_drvdata(dai);
 178
 179         snd_soc_dai_set_dma_data(dai, substream, dev->dma_params);
 180         return 0;
 181 }
 182
 183 #define DAVINCI_VCIF_RATES      SNDRV_PCM_RATE_8000_48000
 184
 185 static struct snd_soc_dai_ops davinci_vcif_dai_ops = {
 186         .startup        = davinci_vcif_startup,
 187         .trigger        = davinci_vcif_trigger,
 188         .hw_params      = davinci_vcif_hw_params,
 189 };
 190
 191 static struct snd_soc_dai_driver davinci_vcif_dai = {
 192         .playback = {
 193                 .channels_min = 1,
 194                 .channels_max = 2,
 195                 .rates = DAVINCI_VCIF_RATES,
 196                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 197         .capture = {
 198                 .channels_min = 1,
 199                 .channels_max = 2,
 200                 .rates = DAVINCI_VCIF_RATES,
 201                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 202         .ops = &davinci_vcif_dai_ops,
 203
 204 };
 205
 206 static int davinci_vcif_probe(struct platform_device *pdev)
 207 {
 208         struct davinci_vc *davinci_vc = pdev->dev.platform_data;
 209         struct davinci_vcif_dev *davinci_vcif_dev;
 210         int ret;
 211
 212         davinci_vcif_dev = kzalloc(sizeof(struct davinci_vcif_dev), 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_params[SNDRV_PCM_STREAM_PLAYBACK].channel =
 222                                         davinci_vc->davinci_vcif.dma_tx_channel;
 223         davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK].dma_addr =
 224                                         davinci_vc->davinci_vcif.dma_tx_addr;
 225
 226         /* DMA rx params */
 227         davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].channel =
 228                                         davinci_vc->davinci_vcif.dma_rx_channel;
 229         davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].dma_addr =
 230                                         davinci_vc->davinci_vcif.dma_rx_addr;
 231
 232         dev_set_drvdata(&pdev->dev, davinci_vcif_dev);
 233
 234         ret = snd_soc_register_dai(&pdev->dev, &davinci_vcif_dai);
 235         if (ret != 0) {
 236                 dev_err(&pdev->dev, "could not register dai\n");
 237                 goto fail;
 238         }
 239
 240         return 0;
 241
 242 fail:
 243         kfree(davinci_vcif_dev);
 244
 245         return ret;
 246 }
 247
 248 static int davinci_vcif_remove(struct platform_device *pdev)
 249 {
 250         struct davinci_vcif_dev *davinci_vcif_dev = dev_get_drvdata(&pdev->dev);
 251
 252         snd_soc_unregister_dai(&pdev->dev);
 253         kfree(davinci_vcif_dev);
 254
 255         return 0;
 256 }
 257
 258 static struct platform_driver davinci_vcif_driver = {
 259         .probe          = davinci_vcif_probe,
 260         .remove         = davinci_vcif_remove,
 261         .driver         = {
 262                 .name   = "davinci-vcif",
 263                 .owner  = THIS_MODULE,
 264         },
 265 };
 266
 267 static int __init davinci_vcif_init(void)
 268 {
 269         return platform_driver_probe(&davinci_vcif_driver, davinci_vcif_probe);
 270 }
 271 module_init(davinci_vcif_init);
 272
 273 static void __exit davinci_vcif_exit(void)
 274 {
 275         platform_driver_unregister(&davinci_vcif_driver);
 276 }
 277 module_exit(davinci_vcif_exit);
 278
 279 MODULE_AUTHOR("Miguel Aguilar");
 280 MODULE_DESCRIPTION("Texas Instruments DaVinci ASoC Voice Codec Interface");
 281 MODULE_LICENSE("GPL");