LXR linux/sound/soc/ti/davinci-vcif.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * ALSA SoC Voice Codec Interface for TI DAVINCI processor
   4 *
   5 * Copyright (C) 2010 Texas Instruments.
   6 *
   7 * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
   8 */
   9
  10#include <linux/init.h>
  11#include <linux/module.h>
  12#include <linux/device.h>
  13#include <linux/delay.h>
  14#include <linux/slab.h>
  15#include <linux/io.h>
  16#include <linux/mfd/davinci_voicecodec.h>
  17
  18#include <sound/core.h>
  19#include <sound/pcm.h>
  20#include <sound/pcm_params.h>
  21#include <sound/initval.h>
  22#include <sound/soc.h>
  23#include <sound/dmaengine_pcm.h>
  24
  25#include "edma-pcm.h"
  26#include "davinci-i2s.h"
  27
  28#define MOD_REG_BIT(val, mask, set) do { \
  29        if (set) { \
  30                val |= mask; \
  31        } else { \
  32                val &= ~mask; \
  33        } \
  34} while (0)
  35
  36struct davinci_vcif_dev {
  37        struct davinci_vc *davinci_vc;
  38        struct snd_dmaengine_dai_dma_data dma_data[2];
  39        int dma_request[2];
  40};
  41
  42static void davinci_vcif_start(struct snd_pcm_substream *substream)
  43{
  44        struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
  45        struct davinci_vcif_dev *davinci_vcif_dev =
  46                        snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0));
  47        struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
  48        u32 w;
  49
  50        /* Start the sample generator and enable transmitter/receiver */
  51        w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
  52
  53        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  54                MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 0);
  55        else
  56                MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 0);
  57
  58        writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
  59}
  60
  61static void davinci_vcif_stop(struct snd_pcm_substream *substream)
  62{
  63        struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
  64        struct davinci_vcif_dev *davinci_vcif_dev =
  65                        snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0));
  66        struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
  67        u32 w;
  68
  69        /* Reset transmitter/receiver and sample rate/frame sync generators */
  70        w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
  71        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  72                MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 1);
  73        else
  74                MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 1);
  75
  76        writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
  77}
  78
  79static int davinci_vcif_hw_params(struct snd_pcm_substream *substream,
  80                                  struct snd_pcm_hw_params *params,
  81                                  struct snd_soc_dai *dai)
  82{
  83        struct davinci_vcif_dev *davinci_vcif_dev = snd_soc_dai_get_drvdata(dai);
  84        struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
  85        u32 w;
  86
  87        /* Restart the codec before setup */
  88        davinci_vcif_stop(substream);
  89        davinci_vcif_start(substream);
  90
  91        /* General line settings */
  92        writel(DAVINCI_VC_CTRL_MASK, davinci_vc->base + DAVINCI_VC_CTRL);
  93
  94        writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTCLR);
  95
  96        writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTEN);
  97
  98        w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
  99
 100        /* Determine xfer data type */
 101        switch (params_format(params)) {
 102        case SNDRV_PCM_FORMAT_U8:
 103                MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
 104                            DAVINCI_VC_CTRL_RD_UNSIGNED |
 105                            DAVINCI_VC_CTRL_WD_BITS_8 |
 106                            DAVINCI_VC_CTRL_WD_UNSIGNED, 1);
 107                break;
 108        case SNDRV_PCM_FORMAT_S8:
 109                MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
 110                            DAVINCI_VC_CTRL_WD_BITS_8, 1);
 111
 112                MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_UNSIGNED |
 113                            DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
 114                break;
 115        case SNDRV_PCM_FORMAT_S16_LE:
 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, 0);
 120                break;
 121        default:
 122                printk(KERN_WARNING "davinci-vcif: unsupported PCM format");
 123                return -EINVAL;
 124        }
 125
 126        writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
 127
 128        return 0;
 129}
 130
 131static int davinci_vcif_trigger(struct snd_pcm_substream *substream, int cmd,
 132                                struct snd_soc_dai *dai)
 133{
 134        int ret = 0;
 135
 136        switch (cmd) {
 137        case SNDRV_PCM_TRIGGER_START:
 138        case SNDRV_PCM_TRIGGER_RESUME:
 139        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 140                davinci_vcif_start(substream);
 141                break;
 142        case SNDRV_PCM_TRIGGER_STOP:
 143        case SNDRV_PCM_TRIGGER_SUSPEND:
 144        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 145                davinci_vcif_stop(substream);
 146                break;
 147        default:
 148                ret = -EINVAL;
 149        }
 150
 151        return ret;
 152}
 153
 154#define DAVINCI_VCIF_RATES      SNDRV_PCM_RATE_8000_48000
 155
 156static const struct snd_soc_dai_ops davinci_vcif_dai_ops = {
 157        .trigger        = davinci_vcif_trigger,
 158        .hw_params      = davinci_vcif_hw_params,
 159};
 160
 161static int davinci_vcif_dai_probe(struct snd_soc_dai *dai)
 162{
 163        struct davinci_vcif_dev *dev = snd_soc_dai_get_drvdata(dai);
 164
 165        dai->playback_dma_data = &dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK];
 166        dai->capture_dma_data = &dev->dma_data[SNDRV_PCM_STREAM_CAPTURE];
 167
 168        return 0;
 169}
 170
 171static struct snd_soc_dai_driver davinci_vcif_dai = {
 172        .probe = davinci_vcif_dai_probe,
 173        .playback = {
 174                .channels_min = 1,
 175                .channels_max = 2,
 176                .rates = DAVINCI_VCIF_RATES,
 177                .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 178        .capture = {
 179                .channels_min = 1,
 180                .channels_max = 2,
 181                .rates = DAVINCI_VCIF_RATES,
 182                .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 183        .ops = &davinci_vcif_dai_ops,
 184
 185};
 186
 187static const struct snd_soc_component_driver davinci_vcif_component = {
 188        .name           = "davinci-vcif",
 189};
 190
 191static int davinci_vcif_probe(struct platform_device *pdev)
 192{
 193        struct davinci_vc *davinci_vc = pdev->dev.platform_data;
 194        struct davinci_vcif_dev *davinci_vcif_dev;
 195        int ret;
 196
 197        davinci_vcif_dev = devm_kzalloc(&pdev->dev,
 198                                        sizeof(struct davinci_vcif_dev),
 199                                        GFP_KERNEL);
 200        if (!davinci_vcif_dev)
 201                return -ENOMEM;
 202
 203        /* DMA tx params */
 204        davinci_vcif_dev->davinci_vc = davinci_vc;
 205        davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].filter_data =
 206                                &davinci_vc->davinci_vcif.dma_tx_channel;
 207        davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].addr =
 208                                davinci_vc->davinci_vcif.dma_tx_addr;
 209
 210        /* DMA rx params */
 211        davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].filter_data =
 212                                &davinci_vc->davinci_vcif.dma_rx_channel;
 213        davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].addr =
 214                                davinci_vc->davinci_vcif.dma_rx_addr;
 215
 216        dev_set_drvdata(&pdev->dev, davinci_vcif_dev);
 217
 218        ret = devm_snd_soc_register_component(&pdev->dev,
 219                                              &davinci_vcif_component,
 220                                              &davinci_vcif_dai, 1);
 221        if (ret != 0) {
 222                dev_err(&pdev->dev, "could not register dai\n");
 223                return ret;
 224        }
 225
 226        ret = edma_pcm_platform_register(&pdev->dev);
 227        if (ret) {
 228                dev_err(&pdev->dev, "register PCM failed: %d\n", ret);
 229                return ret;
 230        }
 231
 232        return 0;
 233}
 234
 235static struct platform_driver davinci_vcif_driver = {
 236        .probe          = davinci_vcif_probe,
 237        .driver         = {
 238                .name   = "davinci-vcif",
 239        },
 240};
 241
 242module_platform_driver(davinci_vcif_driver);
 243
 244MODULE_AUTHOR("Miguel Aguilar");
 245MODULE_DESCRIPTION("Texas Instruments DaVinci ASoC Voice Codec Interface");
 246MODULE_LICENSE("GPL");
 247