LXR linux/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
  49struct 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
  55static 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
  74static 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
  92static 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
 144static 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
 169static const struct snd_soc_dai_ops davinci_vcif_dai_ops = {
 170        .trigger        = davinci_vcif_trigger,
 171        .hw_params      = davinci_vcif_hw_params,
 172};
 173
 174static 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
 184static 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
 200static const struct snd_soc_component_driver davinci_vcif_component = {
 201        .name           = "davinci-vcif",
 202};
 203
 204static 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                return -ENOMEM;
 215
 216        /* DMA tx params */
 217        davinci_vcif_dev->davinci_vc = davinci_vc;
 218        davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].filter_data =
 219                                &davinci_vc->davinci_vcif.dma_tx_channel;
 220        davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].addr =
 221                                davinci_vc->davinci_vcif.dma_tx_addr;
 222
 223        /* DMA rx params */
 224        davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].filter_data =
 225                                &davinci_vc->davinci_vcif.dma_rx_channel;
 226        davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].addr =
 227                                davinci_vc->davinci_vcif.dma_rx_addr;
 228
 229        dev_set_drvdata(&pdev->dev, davinci_vcif_dev);
 230
 231        ret = devm_snd_soc_register_component(&pdev->dev,
 232                                              &davinci_vcif_component,
 233                                              &davinci_vcif_dai, 1);
 234        if (ret != 0) {
 235                dev_err(&pdev->dev, "could not register dai\n");
 236                return ret;
 237        }
 238
 239        ret = edma_pcm_platform_register(&pdev->dev);
 240        if (ret) {
 241                dev_err(&pdev->dev, "register PCM failed: %d\n", ret);
 242                return ret;
 243        }
 244
 245        return 0;
 246}
 247
 248static struct platform_driver davinci_vcif_driver = {
 249        .probe          = davinci_vcif_probe,
 250        .driver         = {
 251                .name   = "davinci-vcif",
 252        },
 253};
 254
 255module_platform_driver(davinci_vcif_driver);
 256
 257MODULE_AUTHOR("Miguel Aguilar");
 258MODULE_DESCRIPTION("Texas Instruments DaVinci ASoC Voice Codec Interface");
 259MODULE_LICENSE("GPL");
 260