cregit-Linux how code gets into the kernel

Release 4.7 sound/soc/soc-generic-dmaengine-pcm.c

Directory: sound/soc
/*
 *  Copyright (C) 2013, Analog Devices Inc.
 *      Author: Lars-Peter Clausen <lars@metafoo.de>
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under  the terms of the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the License, or (at your
 *  option) any later version.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/dmaengine.h>
#include <linux/slab.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <linux/dma-mapping.h>
#include <linux/of.h>

#include <sound/dmaengine_pcm.h>

/*
 * The platforms dmaengine driver does not support reporting the amount of
 * bytes that are still left to transfer.
 */

#define SND_DMAENGINE_PCM_FLAG_NO_RESIDUE BIT(31)


struct dmaengine_pcm {
	
struct dma_chan *chan[SNDRV_PCM_STREAM_LAST + 1];
	
const struct snd_dmaengine_pcm_config *config;
	
struct snd_soc_platform platform;
	
unsigned int flags;
};




static struct dmaengine_pcm *soc_platform_to_pcm(struct snd_soc_platform *p)
{
	return container_of(p, struct dmaengine_pcm, platform);
}


Contributors
PersonTokensPropCommitsCommitProp
lars-peter clausenlars-peter clausen24100.00%1100.00%


Total24100.00%1100.00%






static struct device *dmaengine_dma_dev(struct dmaengine_pcm *pcm,
	struct snd_pcm_substream *substream)
{
	if (!pcm->chan[substream->stream])
		return NULL;

	return pcm->chan[substream->stream]->device->dev;
}


Contributors
PersonTokensPropCommitsCommitProp
lars-peter clausenlars-peter clausen47100.00%1100.00%


Total47100.00%1100.00%



/**
 * snd_dmaengine_pcm_prepare_slave_config() - Generic prepare_slave_config callback
 * @substream: PCM substream
 * @params: hw_params
 * @slave_config: DMA slave config to prepare
 *
 * This function can be used as a generic prepare_slave_config callback for
 * platforms which make use of the snd_dmaengine_dai_dma_data struct for their
 * DAI DMA data. Internally the function will first call
 * snd_hwparams_to_dma_slave_config to fill in the slave config based on the
 * hw_params, followed by snd_dmaengine_set_config_from_dai_data to fill in the
 * remaining fields based on the DAI DMA data.
 */



int snd_dmaengine_pcm_prepare_slave_config(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 snd_dmaengine_dai_dma_data *dma_data;
	int ret;

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

	ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
	if (ret)
		return ret;

	snd_dmaengine_pcm_set_config_from_dai_data(substream, dma_data,
		slave_config);

	return 0;
}

Contributors
PersonTokensPropCommitsCommitProp
lars-peter clausenlars-peter clausen78100.00%1100.00%


Total78100.00%1100.00%




EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_prepare_slave_config);




static int dmaengine_pcm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
	struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
	int (*prepare_slave_config)(struct snd_pcm_substream *substream,
			struct snd_pcm_hw_params *params,
			struct dma_slave_config *slave_config);
	struct dma_slave_config slave_config;
	int ret;

	memset(&slave_config, 0, sizeof(slave_config));

	if (!pcm->config)
		prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config;
	else
		prepare_slave_config = pcm->config->prepare_slave_config;

	if (prepare_slave_config) {
		ret = prepare_slave_config(substream, params, &slave_config);
		if (ret)
			return ret;

		ret = dmaengine_slave_config(chan, &slave_config);
		if (ret)
			return ret;
	}

	return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
}


Contributors
PersonTokensPropCommitsCommitProp
lars-peter clausenlars-peter clausen14991.98%266.67%


lee joneslee jones138.02%133.33%


Total162100.00%3100.00%






static int dmaengine_pcm_set_runtime_hwparams(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
	struct device *dma_dev = dmaengine_dma_dev(pcm, substream);
	struct dma_chan *chan = pcm->chan[substream->stream];
	struct snd_dmaengine_dai_dma_data *dma_data;
	struct dma_slave_caps dma_caps;
	struct snd_pcm_hardware hw;
	u32 addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
			  BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
			  BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
	int i, ret;

	if (pcm->config && pcm->config->pcm_hardware)
		return snd_soc_set_runtime_hwparams(substream,
				pcm->config->pcm_hardware);

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

	memset(&hw, 0, sizeof(hw));
	hw.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
			SNDRV_PCM_INFO_INTERLEAVED;
	hw.periods_min = 2;
	hw.periods_max = UINT_MAX;
	hw.period_bytes_min = 256;
	hw.period_bytes_max = dma_get_max_seg_size(dma_dev);
	hw.buffer_bytes_max = SIZE_MAX;
	hw.fifo_size = dma_data->fifo_size;

	if (pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
		hw.info |= SNDRV_PCM_INFO_BATCH;

	ret = dma_get_slave_caps(chan, &dma_caps);
	if (ret == 0) {
		if (dma_caps.cmd_pause)
			hw.info |= SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME;
		if (dma_caps.residue_granularity <= DMA_RESIDUE_GRANULARITY_SEGMENT)
			hw.info |= SNDRV_PCM_INFO_BATCH;

		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
			addr_widths = dma_caps.dst_addr_widths;
		else
			addr_widths = dma_caps.src_addr_widths;
	}

	/*
         * If SND_DMAENGINE_PCM_DAI_FLAG_PACK is set keep
         * hw.formats set to 0, meaning no restrictions are in place.
         * In this case it's the responsibility of the DAI driver to
         * provide the supported format information.
         */
	if (!(dma_data->flags & SND_DMAENGINE_PCM_DAI_FLAG_PACK))
		/*
                 * Prepare formats mask for valid/allowed sample types. If the
                 * dma does not have support for the given physical word size,
                 * it needs to be masked out so user space can not use the
                 * format which produces corrupted audio.
                 * In case the dma driver does not implement the slave_caps the
                 * default assumption is that it supports 1, 2 and 4 bytes
                 * widths.
                 */
		for (i = 0; i <= SNDRV_PCM_FORMAT_LAST; i++) {
			int bits = snd_pcm_format_physical_width(i);

			/*
                         * Enable only samples with DMA supported physical
                         * widths
                         */
			switch (bits) {
			case 8:
			case 16:
			case 24:
			case 32:
			case 64:
				if (addr_widths & (1 << (bits / 8)))
					hw.formats |= (1LL << i);
				break;
			default:
				/* Unsupported types */
				break;
			}
		}

	return snd_soc_set_runtime_hwparams(substream, &hw);
}


Contributors
PersonTokensPropCommitsCommitProp
lars-peter clausenlars-peter clausen24265.58%562.50%


peter ujfalusipeter ujfalusi11230.35%112.50%


matthias reichlmatthias reichl143.79%112.50%


maxime ripardmaxime ripard10.27%112.50%


Total369100.00%8100.00%






static int dmaengine_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
	struct dma_chan *chan = pcm->chan[substream->stream];
	int ret;

	ret = dmaengine_pcm_set_runtime_hwparams(substream);
	if (ret)
		return ret;

	return snd_dmaengine_pcm_open(substream, chan);
}


Contributors
PersonTokensPropCommitsCommitProp
lars-peter clausenlars-peter clausen71100.00%2100.00%


Total71100.00%2100.00%






static struct dma_chan *dmaengine_pcm_compat_request_channel(
	struct snd_soc_pcm_runtime *rtd,
	struct snd_pcm_substream *substream)
{
	struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
	struct snd_dmaengine_dai_dma_data *dma_data;
	dma_filter_fn fn = NULL;

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

	if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) && pcm->chan[0])
		return pcm->chan[0];

	if (pcm->config && pcm->config->compat_request_channel)
		return pcm->config->compat_request_channel(rtd, substream);

	if (pcm->config)
		fn = pcm->config->compat_filter_fn;

	return snd_dmaengine_pcm_request_channel(fn, dma_data->filter_data);
}


Contributors
PersonTokensPropCommitsCommitProp
lars-peter clausenlars-peter clausen8467.74%250.00%


xiubo lixiubo li2217.74%125.00%


mark brownmark brown1814.52%125.00%


Total124100.00%4100.00%






static bool dmaengine_pcm_can_report_residue(struct device *dev,
	struct dma_chan *chan)
{
	struct dma_slave_caps dma_caps;
	int ret;

	ret = dma_get_slave_caps(chan, &dma_caps);
	if (ret != 0) {
		dev_warn(dev, "Failed to get DMA channel capabilities, falling back to period counting: %d\n",
			 ret);
		return false;
	}

	if (dma_caps.residue_granularity == DMA_RESIDUE_GRANULARITY_DESCRIPTOR)
		return false;

	return true;
}


Contributors
PersonTokensPropCommitsCommitProp
lars-peter clausenlars-peter clausen67100.00%2100.00%


Total67100.00%2100.00%






static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
	struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
	const struct snd_dmaengine_pcm_config *config = pcm->config;
	struct device *dev = rtd->platform->dev;
	struct snd_dmaengine_dai_dma_data *dma_data;
	struct snd_pcm_substream *substream;
	size_t prealloc_buffer_size;
	size_t max_buffer_size;
	unsigned int i;
	int ret;

	if (config && config->prealloc_buffer_size) {
		prealloc_buffer_size = config->prealloc_buffer_size;
		max_buffer_size = config->pcm_hardware->buffer_bytes_max;
	} else {
		prealloc_buffer_size = 512 * 1024;
		max_buffer_size = SIZE_MAX;
	}


	for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
		substream = rtd->pcm->streams[i].substream;
		if (!substream)
			continue;

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

		if (!pcm->chan[i] &&
		    (pcm->flags & SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME))
			pcm->chan[i] = dma_request_slave_channel(dev,
				dma_data->chan_name);

		if (!pcm->chan[i] && (pcm->flags & SND_DMAENGINE_PCM_FLAG_COMPAT)) {
			pcm->chan[i] = dmaengine_pcm_compat_request_channel(rtd,
				substream);
		}

		if (!pcm->chan[i]) {
			dev_err(rtd->platform->dev,
				"Missing dma channel for stream: %d\n", i);
			return -EINVAL;
		}

		ret = snd_pcm_lib_preallocate_pages(substream,
				SNDRV_DMA_TYPE_DEV_IRAM,
				dmaengine_dma_dev(pcm, substream),
				prealloc_buffer_size,
				max_buffer_size);
		if (ret)
			return ret;

		if (!dmaengine_pcm_can_report_residue(dev, pcm->chan[i]))
			pcm->flags |= SND_DMAENGINE_PCM_FLAG_NO_RESIDUE;
	}

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
lars-peter clausenlars-peter clausen23579.12%777.78%


mark brownmark brown6120.54%111.11%


nicolin chennicolin chen10.34%111.11%


Total297100.00%9100.00%






static snd_pcm_uframes_t dmaengine_pcm_pointer(
	struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);

	if (pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
		return snd_dmaengine_pcm_pointer_no_residue(substream);
	else
		return snd_dmaengine_pcm_pointer(substream);
}


Contributors
PersonTokensPropCommitsCommitProp
lars-peter clausenlars-peter clausen53100.00%2100.00%


Total53100.00%2100.00%




static const struct snd_pcm_ops dmaengine_pcm_ops = {
	.open		= dmaengine_pcm_open,
	.close		= snd_dmaengine_pcm_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= dmaengine_pcm_hw_params,
	.hw_free	= snd_pcm_lib_free_pages,
	.trigger	= snd_dmaengine_pcm_trigger,
	.pointer	= dmaengine_pcm_pointer,
};


static const struct snd_soc_platform_driver dmaengine_pcm_platform = {
	.component_driver = {
		.probe_order = SND_SOC_COMP_ORDER_LATE,
        },
	.ops		= &dmaengine_pcm_ops,
	.pcm_new	= dmaengine_pcm_new,
};


static const char * const dmaengine_pcm_dma_channel_names[] = {
	[SNDRV_PCM_STREAM_PLAYBACK] = "tx",
	[SNDRV_PCM_STREAM_CAPTURE] = "rx",
};




static int dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
	struct device *dev, const struct snd_dmaengine_pcm_config *config)
{
	unsigned int i;
	const char *name;
	struct dma_chan *chan;

	if ((pcm->flags & (SND_DMAENGINE_PCM_FLAG_NO_DT |
			   SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME)) ||
	    !dev->of_node)
		return 0;

	if (config && config->dma_dev) {
		/*
                 * If this warning is seen, it probably means that your Linux
                 * device structure does not match your HW device structure.
                 * It would be best to refactor the Linux device structure to
                 * correctly match the HW structure.
                 */
		dev_warn(dev, "DMA channels sourced from device %s",
			 dev_name(config->dma_dev));
		dev = config->dma_dev;
	}

	for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE;
	     i++) {
		if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
			name = "rx-tx";
		else
			name = dmaengine_pcm_dma_channel_names[i];
		if (config && config->chan_names[i])
			name = config->chan_names[i];
		chan = dma_request_slave_channel_reason(dev, name);
		if (IS_ERR(chan)) {
			if (PTR_ERR(chan) == -EPROBE_DEFER)
				return -EPROBE_DEFER;
			pcm->chan[i] = NULL;
		} else {
			pcm->chan[i] = chan;
		}
		if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
			break;
	}

	if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
		pcm->chan[1] = pcm->chan[0];

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
stephen warrenstephen warren16069.26%342.86%


lars-peter clausenlars-peter clausen5825.11%114.29%


shawn guoshawn guo52.16%114.29%


mark brownmark brown41.73%114.29%


xiubo lixiubo li41.73%114.29%


Total231100.00%7100.00%






static void dmaengine_pcm_release_chan(struct dmaengine_pcm *pcm)
{
	unsigned int i;

	for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE;
	     i++) {
		if (!pcm->chan[i])
			continue;
		dma_release_channel(pcm->chan[i]);
		if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
			break;
	}
}


Contributors
PersonTokensPropCommitsCommitProp
stephen warrenstephen warren60100.00%1100.00%


Total60100.00%1100.00%



/**
 * snd_dmaengine_pcm_register - Register a dmaengine based PCM device
 * @dev: The parent device for the PCM device
 * @config: Platform specific PCM configuration
 * @flags: Platform specific quirks
 */



int snd_dmaengine_pcm_register(struct device *dev,
	const struct snd_dmaengine_pcm_config *config, unsigned int flags)
{
	struct dmaengine_pcm *pcm;
	int ret;

	pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
	if (!pcm)
		return -ENOMEM;

	pcm->config = config;
	pcm->flags = flags;

	ret = dmaengine_pcm_request_chan_of(pcm, dev, config);
	if (ret)
		goto err_free_dma;

	ret = snd_soc_add_platform(dev, &pcm->platform,
		&dmaengine_pcm_platform);
	if (ret)
		goto err_free_dma;

	return 0;

err_free_dma:
	dmaengine_pcm_release_chan(pcm);
	kfree(pcm);
	return ret;
}

Contributors
PersonTokensPropCommitsCommitProp
lars-peter clausenlars-peter clausen8167.50%457.14%


stephen warrenstephen warren3932.50%342.86%


Total120100.00%7100.00%




EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_register);

/**
 * snd_dmaengine_pcm_unregister - Removes a dmaengine based PCM device
 * @dev: Parent device the PCM was register with
 *
 * Removes a dmaengine based PCM device previously registered with
 * snd_dmaengine_pcm_register.
 */



void snd_dmaengine_pcm_unregister(struct device *dev)
{
	struct snd_soc_platform *platform;
	struct dmaengine_pcm *pcm;

	platform = snd_soc_lookup_platform(dev);
	if (!platform)
		return;

	pcm = soc_platform_to_pcm(platform);

	snd_soc_remove_platform(platform);
	dmaengine_pcm_release_chan(pcm);
	kfree(pcm);
}

Contributors
PersonTokensPropCommitsCommitProp
lars-peter clausenlars-peter clausen5192.73%150.00%


stephen warrenstephen warren47.27%150.00%


Total55100.00%2100.00%




EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_unregister);

MODULE_LICENSE("GPL");

Overall Contributors
PersonTokensPropCommitsCommitProp
lars-peter clausenlars-peter clausen142173.25%1244.44%


stephen warrenstephen warren26313.56%414.81%


peter ujfalusipeter ujfalusi1125.77%13.70%


mark brownmark brown834.28%27.41%


xiubo lixiubo li261.34%27.41%


matthias reichlmatthias reichl140.72%13.70%


lee joneslee jones130.67%13.70%


shawn guoshawn guo50.26%13.70%


maxime ripardmaxime ripard10.05%13.70%


nicolin chennicolin chen10.05%13.70%


takashi iwaitakashi iwai10.05%13.70%


Total1940100.00%27100.00%

  
Directory: sound/soc



Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
{% endraw %}