C++ snd_soc_dai_get_dma_data函数代码示例

/* this may get called several times by oss emulation */
static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
			      struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct omap_pcm_dma_data *dma_data;
	struct dma_slave_config config;
	struct dma_chan *chan;
	int err = 0;

	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

	/* return if this is a bufferless transfer e.g.
	 * codec <--> BT codec or GSM modem -- lg FIXME */
	if (!dma_data)
		return 0;

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	runtime->dma_bytes = params_buffer_bytes(params);

	chan = snd_dmaengine_pcm_get_chan(substream);
	if (!chan)
		return -EINVAL;

	/* fills in addr_width and direction */
	err = snd_hwparams_to_dma_slave_config(substream, params, &config);
	if (err)
		return err;

	snd_dmaengine_pcm_set_config_from_dai_data(substream,
			snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
			&config);

	return dmaengine_slave_config(chan, &config);
}

static struct cygnus_aio_port *cygnus_dai_get_dma_data(
				struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;

	return snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
}

static void snd_imx_dma_err_callback(int channel, void *data, int err)
{
	struct snd_pcm_substream *substream = data;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct imx_pcm_dma_params *dma_params = 
		snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	int ret;

	pr_err("DMA timeout on channel %d -%s%s%s%s\n",
		 channel,
		 err & IMX_DMA_ERR_BURST ?    " burst" : "",
		 err & IMX_DMA_ERR_REQUEST ?  " request" : "",
		 err & IMX_DMA_ERR_TRANSFER ? " transfer" : "",
		 err & IMX_DMA_ERR_BUFFER ?   " buffer" : "");

	imx_dma_disable(iprtd->dma);
	ret = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
			IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
			substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
			DMA_MODE_WRITE : DMA_MODE_READ);
	if (!ret)
		imx_dma_enable(iprtd->dma);
}

static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct imx_pcm_dma_params *dma_params;
	struct imx_pcm_runtime_data *iprtd = runtime->private_data;
	int err;

	dma_params = snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);

	iprtd->substream = substream;
	iprtd->buf = (unsigned int *)substream->dma_buffer.area;
	iprtd->period_cnt = 0;

	pr_debug("%s: buf: %p period: %d periods: %d\n",
			__func__, iprtd->buf, iprtd->period, iprtd->periods);

	err = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,
			IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
			substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
			DMA_MODE_WRITE : DMA_MODE_READ);
	if (err)
		return err;

	return 0;
}

static int s3c24xx_i2s_hw_params(struct snd_pcm_substream *substream,
                                 struct snd_pcm_hw_params *params,
                                 struct snd_soc_dai *dai)
{
    struct snd_dmaengine_dai_dma_data *dma_data;
    u32 iismod;

    pr_debug("Entered %s\n", __func__);

    dma_data = snd_soc_dai_get_dma_data(dai, substream);

    /* Working copies of register */
    iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
    pr_debug("hw_params r: IISMOD: %x\n", iismod);

    switch (params_width(params)) {
    case 8:
        iismod &= ~S3C2410_IISMOD_16BIT;
        dma_data->addr_width = 1;
        break;
    case 16:
        iismod |= S3C2410_IISMOD_16BIT;
        dma_data->addr_width = 2;
        break;
    default:
        return -EINVAL;
    }

    writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
    pr_debug("hw_params w: IISMOD: %x\n", iismod);
    return 0;
}

static int skl_link_pcm_trigger(struct snd_pcm_substream *substream,
	int cmd, struct snd_soc_dai *dai)
{
	struct hdac_ext_stream *link_dev =
				snd_soc_dai_get_dma_data(dai, substream);
	struct hdac_ext_bus *ebus = get_bus_ctx(substream);
	struct hdac_ext_stream *stream = get_hdac_ext_stream(substream);

	dev_dbg(dai->dev, "In %s cmd=%d\n", __func__, cmd);
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_RESUME:
		skl_link_pcm_prepare(substream, dai);
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		snd_hdac_ext_stream_decouple(ebus, stream, true);
		snd_hdac_ext_link_stream_start(link_dev);
		break;

	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_STOP:
		snd_hdac_ext_link_stream_clear(link_dev);
		if (cmd == SNDRV_PCM_TRIGGER_SUSPEND)
			snd_hdac_ext_stream_decouple(ebus, stream, false);
		break;

	default:
		return -EINVAL;
	}
	return 0;
}

static int skl_link_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params,
				struct snd_soc_dai *dai)
{
	struct hdac_ext_bus *ebus = dev_get_drvdata(dai->dev);
	struct hdac_ext_stream *link_dev;
	struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
	struct hdac_ext_dma_params *dma_params;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	struct skl_pipe_params p_params = {0};

	link_dev = snd_hdac_ext_stream_assign(ebus, substream,
					HDAC_EXT_STREAM_TYPE_LINK);
	if (!link_dev)
		return -EBUSY;

	snd_soc_dai_set_dma_data(dai, substream, (void *)link_dev);

	/* set the stream tag in the codec dai dma params  */
	dma_params = snd_soc_dai_get_dma_data(codec_dai, substream);
	if (dma_params)
		dma_params->stream_tag =  hdac_stream(link_dev)->stream_tag;

	p_params.s_fmt = snd_pcm_format_width(params_format(params));
	p_params.ch = params_channels(params);
	p_params.s_freq = params_rate(params);
	p_params.stream = substream->stream;
	p_params.link_dma_id = hdac_stream(link_dev)->stream_tag - 1;

	return skl_tplg_be_update_params(dai, &p_params);
}

static void skl_pcm_close(struct snd_pcm_substream *substream,
		struct snd_soc_dai *dai)
{
	struct hdac_ext_stream *stream = get_hdac_ext_stream(substream);
	struct hdac_ext_bus *ebus = dev_get_drvdata(dai->dev);
	struct skl_dma_params *dma_params = NULL;
	struct skl *skl = ebus_to_skl(ebus);

	dev_dbg(dai->dev, "%s: %s\n", __func__, dai->name);

	snd_hdac_ext_stream_release(stream, skl_get_host_stream_type(ebus));

	dma_params = snd_soc_dai_get_dma_data(dai, substream);
	/*
	 * now we should set this to NULL as we are freeing by the
	 * dma_params
	 */
	snd_soc_dai_set_dma_data(dai, substream, NULL);
	skl_set_suspend_active(substream, dai, false);

	/*
	 * check if close is for "Reference Pin" and set back the
	 * CGCTL.MISCBDCGE if disabled by driver
	 */
	if (!strncmp(dai->name, "Reference Pin", 13) &&
			skl->skl_sst->miscbdcg_disabled) {
		skl->skl_sst->enable_miscbdcge(dai->dev, true);
		skl->skl_sst->miscbdcg_disabled = false;
	}

	kfree(dma_params);
}

static int skl_get_format(struct snd_pcm_substream *substream,
		struct snd_soc_dai *dai)
{
	struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
	struct skl_dma_params *dma_params;
	struct hdac_ext_bus *ebus = dev_get_drvdata(dai->dev);
	int format_val = 0;

	if (ebus->ppcap) {
		struct snd_pcm_runtime *runtime = substream->runtime;

		format_val = snd_hdac_calc_stream_format(runtime->rate,
						runtime->channels,
						runtime->format,
						32, 0);
	} else {
		struct snd_soc_dai *codec_dai = rtd->codec_dai;

		dma_params = snd_soc_dai_get_dma_data(codec_dai, substream);
		if (dma_params)
			format_val = dma_params->format;
	}

	return format_val;
}

static int tegra_pcm_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct tegra_runtime_data *prtd = runtime->private_data;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct tegra_pcm_dma_params * dmap;

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);

	dmap = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	if (dmap) {
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
			setup_dma_tx_request(&prtd->dma_req[0], dmap);
			setup_dma_tx_request(&prtd->dma_req[1], dmap);
		} else {
			setup_dma_rx_request(&prtd->dma_req[0], dmap);
			setup_dma_rx_request(&prtd->dma_req[1], dmap);
		}
	}
	prtd->dma_req[0].size = params_period_bytes(params);
	prtd->dma_req[1].size = prtd->dma_req[0].size;

	return 0;
}

static int atmel_pcm_configure_dma(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_pcm_dma_params *prtd;
	struct ssc_device *ssc;
	int ret;

	prtd = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	ssc = prtd->ssc;

	ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
	if (ret) {
		pr_err("atmel-pcm: hwparams to dma slave configure failed\n");
		return ret;
	}

	slave_config->dst_addr = ssc->phybase + SSC_THR;
	slave_config->dst_maxburst = 1;

	slave_config->src_addr = ssc->phybase + SSC_RHR;
	slave_config->src_maxburst = 1;

	prtd->dma_intr_handler = atmel_pcm_dma_irq;

	return 0;
}

/*--------------------------------------------------------------------------*\
 * PCM operations
\*--------------------------------------------------------------------------*/
static int atmel_pcm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct atmel_runtime_data *prtd = runtime->private_data;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	/* this may get called several times by oss emulation
	 * with different params */

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	runtime->dma_bytes = params_buffer_bytes(params);

	prtd->params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	prtd->params->dma_intr_handler = atmel_pcm_dma_irq;

	prtd->dma_buffer = runtime->dma_addr;
	prtd->dma_buffer_end = runtime->dma_addr + runtime->dma_bytes;
	prtd->period_size = params_period_bytes(params);

	pr_debug("atmel-pcm: "
		"hw_params: DMA for %s initialized "
		"(dma_bytes=%u, period_size=%u)\n",
		prtd->params->name,
		runtime->dma_bytes,
		prtd->period_size);
	return 0;
}

/**
 * atmel_pcm_dma_irq: SSC interrupt handler for DMAENGINE enabled SSC
 *
 * We use DMAENGINE to send/receive data to/from SSC so this ISR is only to
 * check if any overrun occured.
 */
static void atmel_pcm_dma_irq(u32 ssc_sr,
	struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_pcm_dma_params *prtd;

	prtd = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

	if (ssc_sr & prtd->mask->ssc_error) {
		if (snd_pcm_running(substream))
			pr_warn("atmel-pcm: buffer %s on %s (SSC_SR=%#x)\n",
				substream->stream == SNDRV_PCM_STREAM_PLAYBACK
				? "underrun" : "overrun", prtd->name,
				ssc_sr);

		/* stop RX and capture: will be enabled again at restart */
		ssc_writex(prtd->ssc->regs, SSC_CR, prtd->mask->ssc_disable);
		snd_pcm_stream_lock(substream);
		snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
		snd_pcm_stream_unlock(substream);

		/* now drain RHR and read status to remove xrun condition */
		ssc_readx(prtd->ssc->regs, SSC_RHR);
		ssc_readx(prtd->ssc->regs, SSC_SR);
	}
}

static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct sport_device *sport = runtime->private_data;
	unsigned int diff;
	snd_pcm_uframes_t frames;
	struct bf5xx_i2s_pcm_data *dma_data;

	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

	pr_debug("%s enter\n", __func__);
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		diff = sport_curr_offset_tx(sport);
	} else {
		diff = sport_curr_offset_rx(sport);
	}

	/*
	 * TX at least can report one frame beyond the end of the
	 * buffer if we hit the wraparound case - clamp to within the
	 * buffer as the ALSA APIs require.
	 */
	if (diff == snd_pcm_lib_buffer_bytes(substream))
		diff = 0;

	frames = bytes_to_frames(substream->runtime, diff);
	if (dma_data->tdm_mode)
		frames = frames * runtime->channels / 8;

	return frames;
}

static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct sport_device *sport = runtime->private_data;
	int period_bytes = frames_to_bytes(runtime, runtime->period_size);
	struct bf5xx_i2s_pcm_data *dma_data;

	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

	if (dma_data->tdm_mode)
		period_bytes = period_bytes / runtime->channels * 8;

	pr_debug("%s enter\n", __func__);
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
		sport_config_tx_dma(sport, runtime->dma_area,
			runtime->periods, period_bytes);
	} else {
		sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
		sport_config_rx_dma(sport, runtime->dma_area,
			runtime->periods, period_bytes);
	}

	return 0;
}