linux/sound/soc/davinci/davinci-vcif.c
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   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
  48struct davinci_vcif_dev {
  49        struct davinci_vc *davinci_vc;
  50        struct davinci_pcm_dma_params   dma_params[2];
  51};
  52
  53static 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
  72static 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
  90static 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
 152static 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
 175static 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
 186static 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
 192static 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
 207static const struct snd_soc_component_driver davinci_vcif_component = {
 208        .name           = "davinci-vcif",
 209};
 210
 211static int davinci_vcif_probe(struct platform_device *pdev)
 212{
 213        struct davinci_vc *davinci_vc = pdev->dev.platform_data;
 214        struct davinci_vcif_dev *davinci_vcif_dev;
 215        int ret;
 216
 217        davinci_vcif_dev = devm_kzalloc(&pdev->dev,
 218                                        sizeof(struct davinci_vcif_dev),
 219                                        GFP_KERNEL);
 220        if (!davinci_vcif_dev) {
 221                dev_dbg(&pdev->dev,
 222                        "could not allocate memory for private data\n");
 223                return -ENOMEM;
 224        }
 225
 226        /* DMA tx params */
 227        davinci_vcif_dev->davinci_vc = davinci_vc;
 228        davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK].channel =
 229                                        davinci_vc->davinci_vcif.dma_tx_channel;
 230        davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK].dma_addr =
 231                                        davinci_vc->davinci_vcif.dma_tx_addr;
 232
 233        /* DMA rx params */
 234        davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].channel =
 235                                        davinci_vc->davinci_vcif.dma_rx_channel;
 236        davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].dma_addr =
 237                                        davinci_vc->davinci_vcif.dma_rx_addr;
 238
 239        dev_set_drvdata(&pdev->dev, davinci_vcif_dev);
 240
 241        ret = snd_soc_register_component(&pdev->dev, &davinci_vcif_component,
 242                                         &davinci_vcif_dai, 1);
 243        if (ret != 0) {
 244                dev_err(&pdev->dev, "could not register dai\n");
 245                return ret;
 246        }
 247
 248        ret = davinci_soc_platform_register(&pdev->dev);
 249        if (ret) {
 250                dev_err(&pdev->dev, "register PCM failed: %d\n", ret);
 251                snd_soc_unregister_component(&pdev->dev);
 252                return ret;
 253        }
 254
 255        return 0;
 256}
 257
 258static int davinci_vcif_remove(struct platform_device *pdev)
 259{
 260        snd_soc_unregister_component(&pdev->dev);
 261
 262        return 0;
 263}
 264
 265static struct platform_driver davinci_vcif_driver = {
 266        .probe          = davinci_vcif_probe,
 267        .remove         = davinci_vcif_remove,
 268        .driver         = {
 269                .name   = "davinci-vcif",
 270        },
 271};
 272
 273module_platform_driver(davinci_vcif_driver);
 274
 275MODULE_AUTHOR("Miguel Aguilar");
 276MODULE_DESCRIPTION("Texas Instruments DaVinci ASoC Voice Codec Interface");
 277MODULE_LICENSE("GPL");
 278