soc/ti/davinci-vcif.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * ALSA SoC Voice Codec Interface for TI DAVINCI processor
0004  *
0005  * Copyright (C) 2010 Texas Instruments.
0006  *
0007  * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
0008  */
0009
0010 #include <linux/init.h>
0011 #include <linux/module.h>
0012 #include <linux/device.h>
0013 #include <linux/delay.h>
0014 #include <linux/slab.h>
0015 #include <linux/io.h>
0016 #include <linux/mfd/davinci_voicecodec.h>
0017
0018 #include <sound/core.h>
0019 #include <sound/pcm.h>
0020 #include <sound/pcm_params.h>
0021 #include <sound/initval.h>
0022 #include <sound/soc.h>
0023 #include <sound/dmaengine_pcm.h>
0024
0025 #include "edma-pcm.h"
0026 #include "davinci-i2s.h"
0027
0028 #define MOD_REG_BIT(val, mask, set) do { \
0029     if (set) { \
0030         val |= mask; \
0031     } else { \
0032         val &= ~mask; \
0033     } \
0034 } while (0)
0035
0036 struct davinci_vcif_dev {
0037     struct davinci_vc *davinci_vc;
0038     struct snd_dmaengine_dai_dma_data dma_data[2];
0039     int dma_request[2];
0040 };
0041
0042 static void davinci_vcif_start(struct snd_pcm_substream *substream)
0043 {
0044     struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
0045     struct davinci_vcif_dev *davinci_vcif_dev =
0046             snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0));
0047     struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
0048     u32 w;
0049
0050     /* Start the sample generator and enable transmitter/receiver */
0051     w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
0052
0053     if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
0054         MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 0);
0055     else
0056         MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 0);
0057
0058     writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
0059 }
0060
0061 static void davinci_vcif_stop(struct snd_pcm_substream *substream)
0062 {
0063     struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
0064     struct davinci_vcif_dev *davinci_vcif_dev =
0065             snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0));
0066     struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
0067     u32 w;
0068
0069     /* Reset transmitter/receiver and sample rate/frame sync generators */
0070     w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
0071     if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
0072         MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 1);
0073     else
0074         MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 1);
0075
0076     writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
0077 }
0078
0079 static int davinci_vcif_hw_params(struct snd_pcm_substream *substream,
0080                   struct snd_pcm_hw_params *params,
0081                   struct snd_soc_dai *dai)
0082 {
0083     struct davinci_vcif_dev *davinci_vcif_dev = snd_soc_dai_get_drvdata(dai);
0084     struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
0085     u32 w;
0086
0087     /* Restart the codec before setup */
0088     davinci_vcif_stop(substream);
0089     davinci_vcif_start(substream);
0090
0091     /* General line settings */
0092     writel(DAVINCI_VC_CTRL_MASK, davinci_vc->base + DAVINCI_VC_CTRL);
0093
0094     writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTCLR);
0095
0096     writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTEN);
0097
0098     w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
0099
0100     /* Determine xfer data type */
0101     switch (params_format(params)) {
0102     case SNDRV_PCM_FORMAT_U8:
0103         MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
0104                 DAVINCI_VC_CTRL_RD_UNSIGNED |
0105                 DAVINCI_VC_CTRL_WD_BITS_8 |
0106                 DAVINCI_VC_CTRL_WD_UNSIGNED, 1);
0107         break;
0108     case SNDRV_PCM_FORMAT_S8:
0109         MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
0110                 DAVINCI_VC_CTRL_WD_BITS_8, 1);
0111
0112         MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_UNSIGNED |
0113                 DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
0114         break;
0115     case SNDRV_PCM_FORMAT_S16_LE:
0116         MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
0117                 DAVINCI_VC_CTRL_RD_UNSIGNED |
0118                 DAVINCI_VC_CTRL_WD_BITS_8 |
0119                 DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
0120         break;
0121     default:
0122         printk(KERN_WARNING "davinci-vcif: unsupported PCM format");
0123         return -EINVAL;
0124     }
0125
0126     writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
0127
0128     return 0;
0129 }
0130
0131 static int davinci_vcif_trigger(struct snd_pcm_substream *substream, int cmd,
0132                 struct snd_soc_dai *dai)
0133 {
0134     int ret = 0;
0135
0136     switch (cmd) {
0137     case SNDRV_PCM_TRIGGER_START:
0138     case SNDRV_PCM_TRIGGER_RESUME:
0139     case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
0140         davinci_vcif_start(substream);
0141         break;
0142     case SNDRV_PCM_TRIGGER_STOP:
0143     case SNDRV_PCM_TRIGGER_SUSPEND:
0144     case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
0145         davinci_vcif_stop(substream);
0146         break;
0147     default:
0148         ret = -EINVAL;
0149     }
0150
0151     return ret;
0152 }
0153
0154 #define DAVINCI_VCIF_RATES  SNDRV_PCM_RATE_8000_48000
0155
0156 static const struct snd_soc_dai_ops davinci_vcif_dai_ops = {
0157     .trigger    = davinci_vcif_trigger,
0158     .hw_params  = davinci_vcif_hw_params,
0159 };
0160
0161 static int davinci_vcif_dai_probe(struct snd_soc_dai *dai)
0162 {
0163     struct davinci_vcif_dev *dev = snd_soc_dai_get_drvdata(dai);
0164
0165     dai->playback_dma_data = &dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK];
0166     dai->capture_dma_data = &dev->dma_data[SNDRV_PCM_STREAM_CAPTURE];
0167
0168     return 0;
0169 }
0170
0171 static struct snd_soc_dai_driver davinci_vcif_dai = {
0172     .probe = davinci_vcif_dai_probe,
0173     .playback = {
0174         .channels_min = 1,
0175         .channels_max = 2,
0176         .rates = DAVINCI_VCIF_RATES,
0177         .formats = SNDRV_PCM_FMTBIT_S16_LE,},
0178     .capture = {
0179         .channels_min = 1,
0180         .channels_max = 2,
0181         .rates = DAVINCI_VCIF_RATES,
0182         .formats = SNDRV_PCM_FMTBIT_S16_LE,},
0183     .ops = &davinci_vcif_dai_ops,
0184
0185 };
0186
0187 static const struct snd_soc_component_driver davinci_vcif_component = {
0188     .name           = "davinci-vcif",
0189     .legacy_dai_naming  = 1,
0190 };
0191
0192 static int davinci_vcif_probe(struct platform_device *pdev)
0193 {
0194     struct davinci_vc *davinci_vc = pdev->dev.platform_data;
0195     struct davinci_vcif_dev *davinci_vcif_dev;
0196     int ret;
0197
0198     davinci_vcif_dev = devm_kzalloc(&pdev->dev,
0199                     sizeof(struct davinci_vcif_dev),
0200                     GFP_KERNEL);
0201     if (!davinci_vcif_dev)
0202         return -ENOMEM;
0203
0204     /* DMA tx params */
0205     davinci_vcif_dev->davinci_vc = davinci_vc;
0206     davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].filter_data =
0207                 &davinci_vc->davinci_vcif.dma_tx_channel;
0208     davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].addr =
0209                 davinci_vc->davinci_vcif.dma_tx_addr;
0210
0211     /* DMA rx params */
0212     davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].filter_data =
0213                 &davinci_vc->davinci_vcif.dma_rx_channel;
0214     davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].addr =
0215                 davinci_vc->davinci_vcif.dma_rx_addr;
0216
0217     dev_set_drvdata(&pdev->dev, davinci_vcif_dev);
0218
0219     ret = devm_snd_soc_register_component(&pdev->dev,
0220                           &davinci_vcif_component,
0221                           &davinci_vcif_dai, 1);
0222     if (ret != 0) {
0223         dev_err(&pdev->dev, "could not register dai\n");
0224         return ret;
0225     }
0226
0227     ret = edma_pcm_platform_register(&pdev->dev);
0228     if (ret) {
0229         dev_err(&pdev->dev, "register PCM failed: %d\n", ret);
0230         return ret;
0231     }
0232
0233     return 0;
0234 }
0235
0236 static struct platform_driver davinci_vcif_driver = {
0237     .probe      = davinci_vcif_probe,
0238     .driver     = {
0239         .name   = "davinci-vcif",
0240     },
0241 };
0242
0243 module_platform_driver(davinci_vcif_driver);
0244
0245 MODULE_AUTHOR("Miguel Aguilar");
0246 MODULE_DESCRIPTION("Texas Instruments DaVinci ASoC Voice Codec Interface");
0247 MODULE_LICENSE("GPL");