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 #include "davinci-vcif.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 davinci_pcm_dma_params   dma_params[2];
  52 };
  53
  54 static void davinci_vcif_start(struct snd_pcm_substream *substream)
  55 {
  56         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  57         struct davinci_vcif_dev *davinci_vcif_dev =
  58                                         rtd->dai->cpu_dai->private_data;
  59         struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
  60         u32 w;
  61
  62         /* Start the sample generator and enable transmitter/receiver */
  63         w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
  64
  65         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  66                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 1);
  67         else
  68                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 1);
  69
  70         writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
  71 }
  72
  73 static void davinci_vcif_stop(struct snd_pcm_substream *substream)
  74 {
  75         struct snd_soc_pcm_runtime *rtd = substream->private_data;
  76         struct davinci_vcif_dev *davinci_vcif_dev =
  77                                         rtd->dai->cpu_dai->private_data;
  78         struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
  79         u32 w;
  80
  81         /* Reset transmitter/receiver and sample rate/frame sync generators */
  82         w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
  83         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  84                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 0);
  85         else
  86                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 0);
  87
  88         writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
  89 }
  90
  91 static int davinci_vcif_hw_params(struct snd_pcm_substream *substream,
  92                                   struct snd_pcm_hw_params *params,
  93                                   struct snd_soc_dai *dai)
  94 {
  95         struct davinci_vcif_dev *davinci_vcif_dev = dai->private_data;
  96         struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
  97         struct davinci_pcm_dma_params *dma_params =
  98                         &davinci_vcif_dev->dma_params[substream->stream];
  99         u32 w;
 100
 101         /* Restart the codec before setup */
 102         davinci_vcif_stop(substream);
 103         davinci_vcif_start(substream);
 104
 105         /* General line settings */
 106         writel(DAVINCI_VC_CTRL_MASK, davinci_vc->base + DAVINCI_VC_CTRL);
 107
 108         writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTCLR);
 109
 110         writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTEN);
 111
 112         w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
 113
 114         /* Determine xfer data type */
 115         switch (params_format(params)) {
 116         case SNDRV_PCM_FORMAT_U8:
 117                 dma_params->data_type = 0;
 118
 119                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
 120                             DAVINCI_VC_CTRL_RD_UNSIGNED |
 121                             DAVINCI_VC_CTRL_WD_BITS_8 |
 122                             DAVINCI_VC_CTRL_WD_UNSIGNED, 1);
 123                 break;
 124         case SNDRV_PCM_FORMAT_S8:
 125                 dma_params->data_type = 1;
 126
 127                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
 128                             DAVINCI_VC_CTRL_WD_BITS_8, 1);
 129
 130                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_UNSIGNED |
 131                             DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
 132                 break;
 133         case SNDRV_PCM_FORMAT_S16_LE:
 134                 dma_params->data_type = 2;
 135
 136                 MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
 137                             DAVINCI_VC_CTRL_RD_UNSIGNED |
 138                             DAVINCI_VC_CTRL_WD_BITS_8 |
 139                             DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
 140                 break;
 141         default:
 142                 printk(KERN_WARNING "davinci-vcif: unsupported PCM format");
 143                 return -EINVAL;
 144         }
 145
 146         dma_params->acnt  = dma_params->data_type;
 147
 148         writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
 149
 150         return 0;
 151 }
 152
 153 static int davinci_vcif_trigger(struct snd_pcm_substream *substream, int cmd,
 154                                 struct snd_soc_dai *dai)
 155 {
 156         int ret = 0;
 157
 158         switch (cmd) {
 159         case SNDRV_PCM_TRIGGER_START:
 160         case SNDRV_PCM_TRIGGER_RESUME:
 161         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 162                 davinci_vcif_start(substream);
 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 #define DAVINCI_VCIF_RATES      SNDRV_PCM_RATE_8000_48000
 176
 177 static struct snd_soc_dai_ops davinci_vcif_dai_ops = {
 178         .trigger        = davinci_vcif_trigger,
 179         .hw_params      = davinci_vcif_hw_params,
 180 };
 181
 182 struct snd_soc_dai davinci_vcif_dai = {
 183         .name = "davinci-vcif",
 184         .playback = {
 185                 .channels_min = 1,
 186                 .channels_max = 2,
 187                 .rates = DAVINCI_VCIF_RATES,
 188                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 189         .capture = {
 190                 .channels_min = 1,
 191                 .channels_max = 2,
 192                 .rates = DAVINCI_VCIF_RATES,
 193                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 194         .ops = &davinci_vcif_dai_ops,
 195
 196 };
 197 EXPORT_SYMBOL_GPL(davinci_vcif_dai);
 198
 199 static int davinci_vcif_probe(struct platform_device *pdev)
 200 {
 201         struct davinci_vc *davinci_vc = platform_get_drvdata(pdev);
 202         struct davinci_vcif_dev *davinci_vcif_dev;
 203         int ret;
 204
 205         davinci_vcif_dev = kzalloc(sizeof(struct davinci_vcif_dev), GFP_KERNEL);
 206         if (!davinci_vc) {
 207                 dev_dbg(&pdev->dev,
 208                         "could not allocate memory for private data\n");
 209                 return -ENOMEM;
 210         }
 211
 212         /* DMA tx params */
 213         davinci_vcif_dev->davinci_vc = davinci_vc;
 214         davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK].channel =
 215                                         davinci_vc->davinci_vcif.dma_tx_channel;
 216         davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK].dma_addr =
 217                                         davinci_vc->davinci_vcif.dma_tx_addr;
 218
 219         /* DMA rx params */
 220         davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].channel =
 221                                         davinci_vc->davinci_vcif.dma_rx_channel;
 222         davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].dma_addr =
 223                                         davinci_vc->davinci_vcif.dma_rx_addr;
 224
 225         davinci_vcif_dai.dev = &pdev->dev;
 226         davinci_vcif_dai.capture.dma_data = davinci_vcif_dev->dma_params;
 227         davinci_vcif_dai.playback.dma_data = davinci_vcif_dev->dma_params;
 228         davinci_vcif_dai.private_data = davinci_vcif_dev;
 229
 230         ret = snd_soc_register_dai(&davinci_vcif_dai);
 231         if (ret != 0) {
 232                 dev_err(&pdev->dev, "could not register dai\n");
 233                 goto fail;
 234         }
 235
 236         return 0;
 237
 238 fail:
 239         kfree(davinci_vcif_dev);
 240
 241         return ret;
 242 }
 243
 244 static int davinci_vcif_remove(struct platform_device *pdev)
 245 {
 246         snd_soc_unregister_dai(&davinci_vcif_dai);
 247
 248         return 0;
 249 }
 250
 251 static struct platform_driver davinci_vcif_driver = {
 252         .probe          = davinci_vcif_probe,
 253         .remove         = davinci_vcif_remove,
 254         .driver         = {
 255                 .name   = "davinci_vcif",
 256                 .owner  = THIS_MODULE,
 257         },
 258 };
 259
 260 static int __init davinci_vcif_init(void)
 261 {
 262         return platform_driver_probe(&davinci_vcif_driver, davinci_vcif_probe);
 263 }
 264 module_init(davinci_vcif_init);
 265
 266 static void __exit davinci_vcif_exit(void)
 267 {
 268         platform_driver_unregister(&davinci_vcif_driver);
 269 }
 270 module_exit(davinci_vcif_exit);
 271
 272 MODULE_AUTHOR("Miguel Aguilar");
 273 MODULE_DESCRIPTION("Texas Instruments DaVinci ASoC Voice Codec Interface");
 274 MODULE_LICENSE("GPL");