247 строки
6.4 KiB
C
247 строки
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* ALSA SoC Voice Codec Interface for TI DAVINCI processor
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*
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* Copyright (C) 2010 Texas Instruments.
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*
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* Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/mfd/davinci_voicecodec.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/initval.h>
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#include <sound/soc.h>
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#include <sound/dmaengine_pcm.h>
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#include "edma-pcm.h"
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#include "davinci-i2s.h"
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#define MOD_REG_BIT(val, mask, set) do { \
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if (set) { \
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val |= mask; \
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} else { \
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val &= ~mask; \
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} \
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} while (0)
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struct davinci_vcif_dev {
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struct davinci_vc *davinci_vc;
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struct snd_dmaengine_dai_dma_data dma_data[2];
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int dma_request[2];
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};
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static void davinci_vcif_start(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct davinci_vcif_dev *davinci_vcif_dev =
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snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0));
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struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
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u32 w;
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/* Start the sample generator and enable transmitter/receiver */
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w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 0);
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else
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MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 0);
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writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
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}
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static void davinci_vcif_stop(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct davinci_vcif_dev *davinci_vcif_dev =
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snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0));
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struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
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u32 w;
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/* Reset transmitter/receiver and sample rate/frame sync generators */
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w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 1);
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else
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MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 1);
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writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
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}
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static int davinci_vcif_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params,
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struct snd_soc_dai *dai)
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{
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struct davinci_vcif_dev *davinci_vcif_dev = snd_soc_dai_get_drvdata(dai);
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struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
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u32 w;
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/* Restart the codec before setup */
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davinci_vcif_stop(substream);
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davinci_vcif_start(substream);
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/* General line settings */
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writel(DAVINCI_VC_CTRL_MASK, davinci_vc->base + DAVINCI_VC_CTRL);
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writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTCLR);
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writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTEN);
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w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
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/* Determine xfer data type */
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switch (params_format(params)) {
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case SNDRV_PCM_FORMAT_U8:
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MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
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DAVINCI_VC_CTRL_RD_UNSIGNED |
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DAVINCI_VC_CTRL_WD_BITS_8 |
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DAVINCI_VC_CTRL_WD_UNSIGNED, 1);
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break;
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case SNDRV_PCM_FORMAT_S8:
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MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
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DAVINCI_VC_CTRL_WD_BITS_8, 1);
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MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_UNSIGNED |
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DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
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break;
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case SNDRV_PCM_FORMAT_S16_LE:
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MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
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DAVINCI_VC_CTRL_RD_UNSIGNED |
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DAVINCI_VC_CTRL_WD_BITS_8 |
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DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
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break;
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default:
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printk(KERN_WARNING "davinci-vcif: unsupported PCM format");
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return -EINVAL;
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}
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writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
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return 0;
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}
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static int davinci_vcif_trigger(struct snd_pcm_substream *substream, int cmd,
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struct snd_soc_dai *dai)
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{
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int ret = 0;
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_RESUME:
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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davinci_vcif_start(substream);
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
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davinci_vcif_stop(substream);
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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#define DAVINCI_VCIF_RATES SNDRV_PCM_RATE_8000_48000
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static const struct snd_soc_dai_ops davinci_vcif_dai_ops = {
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.trigger = davinci_vcif_trigger,
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.hw_params = davinci_vcif_hw_params,
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};
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static int davinci_vcif_dai_probe(struct snd_soc_dai *dai)
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{
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struct davinci_vcif_dev *dev = snd_soc_dai_get_drvdata(dai);
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dai->playback_dma_data = &dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK];
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dai->capture_dma_data = &dev->dma_data[SNDRV_PCM_STREAM_CAPTURE];
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return 0;
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}
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static struct snd_soc_dai_driver davinci_vcif_dai = {
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.probe = davinci_vcif_dai_probe,
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.playback = {
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.channels_min = 1,
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.channels_max = 2,
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.rates = DAVINCI_VCIF_RATES,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,},
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.capture = {
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.channels_min = 1,
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.channels_max = 2,
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.rates = DAVINCI_VCIF_RATES,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,},
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.ops = &davinci_vcif_dai_ops,
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};
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static const struct snd_soc_component_driver davinci_vcif_component = {
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.name = "davinci-vcif",
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};
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static int davinci_vcif_probe(struct platform_device *pdev)
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{
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struct davinci_vc *davinci_vc = pdev->dev.platform_data;
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struct davinci_vcif_dev *davinci_vcif_dev;
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int ret;
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davinci_vcif_dev = devm_kzalloc(&pdev->dev,
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sizeof(struct davinci_vcif_dev),
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GFP_KERNEL);
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if (!davinci_vcif_dev)
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return -ENOMEM;
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/* DMA tx params */
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davinci_vcif_dev->davinci_vc = davinci_vc;
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davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].filter_data =
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&davinci_vc->davinci_vcif.dma_tx_channel;
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davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].addr =
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davinci_vc->davinci_vcif.dma_tx_addr;
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/* DMA rx params */
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davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].filter_data =
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&davinci_vc->davinci_vcif.dma_rx_channel;
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davinci_vcif_dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].addr =
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davinci_vc->davinci_vcif.dma_rx_addr;
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dev_set_drvdata(&pdev->dev, davinci_vcif_dev);
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ret = devm_snd_soc_register_component(&pdev->dev,
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&davinci_vcif_component,
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&davinci_vcif_dai, 1);
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if (ret != 0) {
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dev_err(&pdev->dev, "could not register dai\n");
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return ret;
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}
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ret = edma_pcm_platform_register(&pdev->dev);
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if (ret) {
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dev_err(&pdev->dev, "register PCM failed: %d\n", ret);
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return ret;
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}
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return 0;
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}
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static struct platform_driver davinci_vcif_driver = {
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.probe = davinci_vcif_probe,
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.driver = {
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.name = "davinci-vcif",
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},
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};
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module_platform_driver(davinci_vcif_driver);
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MODULE_AUTHOR("Miguel Aguilar");
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MODULE_DESCRIPTION("Texas Instruments DaVinci ASoC Voice Codec Interface");
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MODULE_LICENSE("GPL");
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