Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Unverified Commit 42fea318 authored by Baolin Wang's avatar Baolin Wang Committed by Mark Brown
Browse files

ASoC: sprd: Add Spreadtrum audio DMA platfrom driver 



The Spreadtrum DMA engine uses the link-list mode to support audio playback
or capture, thus this patch adds audio DMA platform support for CPU DAI to
trigger DMA link-list transfer.

Signed-off-by: default avatarBaolin Wang <baolin.wang@linaro.org>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 27e27e65

sound/soc/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -64,6 +64,7 @@ source "sound/soc/samsung/Kconfig" 
source "sound/soc/sh/Kconfig"

source "sound/soc/sirf/Kconfig"

source "sound/soc/spear/Kconfig"

source "sound/soc/sprd/Kconfig"

source "sound/soc/sti/Kconfig"

source "sound/soc/stm/Kconfig"

source "sound/soc/sunxi/Kconfig"

sound/soc/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -48,6 +48,7 @@ obj-$(CONFIG_SND_SOC) += samsung/ 
obj-$(CONFIG_SND_SOC)	+= sh/

obj-$(CONFIG_SND_SOC)	+= sirf/

obj-$(CONFIG_SND_SOC)	+= spear/

obj-$(CONFIG_SND_SOC)	+= sprd/

obj-$(CONFIG_SND_SOC)	+= sti/

obj-$(CONFIG_SND_SOC)	+= stm/

obj-$(CONFIG_SND_SOC)	+= sunxi/

sound/soc/sprd/Kconfig

0 → 100644
+6 −0
Original line number Diff line number Diff line 
config SND_SOC_SPRD

	tristate "SoC Audio for the Spreadtrum SoC chips"

	depends on ARCH_SPRD || COMPILE_TEST

	help

	  Say Y or M if you want to add support for codecs attached to

	  the Spreadtrum SoCs' Audio interfaces.

sound/soc/sprd/Makefile

0 → 100644
+4 −0
Original line number Diff line number Diff line 
# SPDX-License-Identifier: GPL-2.0

# Spreadtrum Audio Support



obj-$(CONFIG_SND_SOC_SPRD)	+= sprd-pcm-dma.o

sound/soc/sprd/sprd-pcm-dma.c

0 → 100644
+562 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

// Copyright (C) 2019 Spreadtrum Communications Inc.



#include <linux/dma-mapping.h>

#include <linux/dmaengine.h>

#include <linux/dma/sprd-dma.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <sound/pcm.h>

#include <sound/pcm_params.h>

#include <sound/soc.h>



#include "sprd-pcm-dma.h"



#define DRV_NAME			"sprd_pcm_dma"

#define SPRD_PCM_DMA_LINKLIST_SIZE	64

#define SPRD_PCM_DMA_BRUST_LEN		640



struct sprd_pcm_dma_data {

	struct dma_chan *chan;

	struct dma_async_tx_descriptor *desc;

	dma_cookie_t cookie;

	dma_addr_t phys;

	void *virt;

	int pre_pointer;

};



struct sprd_pcm_dma_private {

	struct snd_pcm_substream *substream;

	struct sprd_pcm_dma_params *params;

	struct sprd_pcm_dma_data data[SPRD_PCM_CHANNEL_MAX];

	int hw_chan;

	int dma_addr_offset;

};



static const struct snd_pcm_hardware sprd_pcm_hardware = {

	.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |

		SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_PAUSE |

		SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,

	.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,

	.period_bytes_min = 1,

	.period_bytes_max = 64 * 1024,

	.periods_min = 1,

	.periods_max = PAGE_SIZE / SPRD_PCM_DMA_LINKLIST_SIZE,

	.buffer_bytes_max = 64 * 1024,

};



static int sprd_pcm_open(struct snd_pcm_substream *substream)

{

	struct snd_pcm_runtime *runtime = substream->runtime;

	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	struct snd_soc_component *component =

		snd_soc_rtdcom_lookup(rtd, DRV_NAME);

	struct device *dev = component->dev;

	struct sprd_pcm_dma_private *dma_private;

	int hw_chan = SPRD_PCM_CHANNEL_MAX;

	int size, ret, i;



	snd_soc_set_runtime_hwparams(substream, &sprd_pcm_hardware);



	ret = snd_pcm_hw_constraint_step(runtime, 0,

					 SNDRV_PCM_HW_PARAM_PERIOD_BYTES,

					 SPRD_PCM_DMA_BRUST_LEN);

	if (ret < 0)

		return ret;



	ret = snd_pcm_hw_constraint_step(runtime, 0,

					 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,

					 SPRD_PCM_DMA_BRUST_LEN);

	if (ret < 0)

		return ret;



	ret = snd_pcm_hw_constraint_integer(runtime,

					    SNDRV_PCM_HW_PARAM_PERIODS);

	if (ret < 0)

		return ret;



	dma_private = devm_kzalloc(dev, sizeof(*dma_private), GFP_KERNEL);

	if (!dma_private)

		return -ENOMEM;



	size = runtime->hw.periods_max * SPRD_PCM_DMA_LINKLIST_SIZE;



	for (i = 0; i < hw_chan; i++) {

		struct sprd_pcm_dma_data *data = &dma_private->data[i];



		data->virt = dmam_alloc_coherent(dev, size, &data->phys,

						 GFP_KERNEL);

		if (!data->virt) {

			ret = -ENOMEM;

			goto error;

		}

	}



	dma_private->hw_chan = hw_chan;

	runtime->private_data = dma_private;

	dma_private->substream = substream;



	return 0;



error:

	for (i = 0; i < hw_chan; i++) {

		struct sprd_pcm_dma_data *data = &dma_private->data[i];



		if (data->virt)

			dmam_free_coherent(dev, size, data->virt, data->phys);

	}



	devm_kfree(dev, dma_private);

	return ret;

}



static int sprd_pcm_close(struct snd_pcm_substream *substream)

{

	struct snd_pcm_runtime *runtime = substream->runtime;

	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	struct sprd_pcm_dma_private *dma_private = runtime->private_data;

	struct snd_soc_component *component =

		snd_soc_rtdcom_lookup(rtd, DRV_NAME);

	struct device *dev = component->dev;

	int size = runtime->hw.periods_max * SPRD_PCM_DMA_LINKLIST_SIZE;

	int i;



	for (i = 0; i < dma_private->hw_chan; i++) {

		struct sprd_pcm_dma_data *data = &dma_private->data[i];



		dmam_free_coherent(dev, size, data->virt, data->phys);

	}



	devm_kfree(dev, dma_private);



	return 0;

}



static void sprd_pcm_dma_complete(void *data)

{

	struct sprd_pcm_dma_private *dma_private = data;

	struct snd_pcm_substream *substream = dma_private->substream;



	snd_pcm_period_elapsed(substream);

}



static void sprd_pcm_release_dma_channel(struct snd_pcm_substream *substream)

{

	struct snd_pcm_runtime *runtime = substream->runtime;

	struct sprd_pcm_dma_private *dma_private = runtime->private_data;

	int i;



	for (i = 0; i < SPRD_PCM_CHANNEL_MAX; i++) {

		struct sprd_pcm_dma_data *data = &dma_private->data[i];



		if (data->chan) {

			dma_release_channel(data->chan);

			data->chan = NULL;

		}

	}

}



static int sprd_pcm_request_dma_channel(struct snd_pcm_substream *substream,

					int channels)

{

	struct snd_pcm_runtime *runtime = substream->runtime;

	struct sprd_pcm_dma_private *dma_private = runtime->private_data;

	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	struct snd_soc_component *component =

		snd_soc_rtdcom_lookup(rtd, DRV_NAME);

	struct device *dev = component->dev;

	struct sprd_pcm_dma_params *dma_params = dma_private->params;

	int i;



	if (channels > SPRD_PCM_CHANNEL_MAX) {

		dev_err(dev, "invalid dma channel number:%d\n", channels);

		return -EINVAL;

	}



	for (i = 0; i < channels; i++) {

		struct sprd_pcm_dma_data *data = &dma_private->data[i];



		data->chan = dma_request_slave_channel(dev,

						       dma_params->chan_name[i]);

		if (!data->chan) {

			dev_err(dev, "failed to request dma channel:%s\n",

				dma_params->chan_name[i]);

			sprd_pcm_release_dma_channel(substream);

			return -ENODEV;

		}

	}



	return 0;

}



static int sprd_pcm_hw_params(struct snd_pcm_substream *substream,

			      struct snd_pcm_hw_params *params)

{

	struct snd_pcm_runtime *runtime = substream->runtime;

	struct sprd_pcm_dma_private *dma_private = runtime->private_data;

	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	struct snd_soc_component *component =

		snd_soc_rtdcom_lookup(rtd, DRV_NAME);

	struct sprd_pcm_dma_params *dma_params;

	size_t totsize = params_buffer_bytes(params);

	size_t period = params_period_bytes(params);

	int channels = params_channels(params);

	int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;

	struct scatterlist *sg;

	unsigned long flags;

	int ret, i, j, sg_num;



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

	if (!dma_params) {

		dev_warn(component->dev, "no dma parameters setting\n");

		dma_private->params = NULL;

		snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);

		runtime->dma_bytes = totsize;

		return 0;

	}



	if (!dma_private->params) {

		dma_private->params = dma_params;

		ret = sprd_pcm_request_dma_channel(substream, channels);

		if (ret)

			return ret;

	}



	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);



	runtime->dma_bytes = totsize;

	sg_num = totsize / period;

	dma_private->dma_addr_offset = totsize / channels;



	sg = devm_kcalloc(component->dev, sg_num, sizeof(*sg), GFP_KERNEL);

	if (!sg) {

		ret = -ENOMEM;

		goto sg_err;

	}



	for (i = 0; i < channels; i++) {

		struct sprd_pcm_dma_data *data = &dma_private->data[i];

		struct dma_chan *chan = data->chan;

		struct dma_slave_config config = { };

		struct sprd_dma_linklist link = { };

		enum dma_transfer_direction dir;

		struct scatterlist *sgt = sg;



		config.src_maxburst = dma_params->fragment_len[i];

		config.src_addr_width = dma_params->datawidth[i];

		config.dst_addr_width = dma_params->datawidth[i];

		if (is_playback) {

			config.src_addr = runtime->dma_addr +

				i * dma_private->dma_addr_offset;

			config.dst_addr = dma_params->dev_phys[i];

			dir = DMA_MEM_TO_DEV;

		} else {

			config.src_addr = dma_params->dev_phys[i];

			config.dst_addr = runtime->dma_addr +

				i * dma_private->dma_addr_offset;

			dir = DMA_DEV_TO_MEM;

		}



		sg_init_table(sgt, sg_num);

		for (j = 0; j < sg_num; j++, sgt++) {

			u32 sg_len = period / channels;



			sg_dma_len(sgt) = sg_len;

			sg_dma_address(sgt) = runtime->dma_addr +

				i * dma_private->dma_addr_offset + sg_len * j;

		}



		/*

		 * Configure the link-list address for the DMA engine link-list

		 * mode.

		 */

		link.virt_addr = (unsigned long)data->virt;

		link.phy_addr = data->phys;



		ret = dmaengine_slave_config(chan, &config);

		if (ret) {

			dev_err(component->dev,

				"failed to set slave configuration: %d\n", ret);

			goto config_err;

		}



		/*

		 * We configure the DMA request mode, interrupt mode, channel

		 * mode and channel trigger mode by the flags.

		 */

		flags = SPRD_DMA_FLAGS(SPRD_DMA_CHN_MODE_NONE, SPRD_DMA_NO_TRG,

				       SPRD_DMA_FRAG_REQ, SPRD_DMA_TRANS_INT);

		data->desc = chan->device->device_prep_slave_sg(chan, sg,

								sg_num, dir,

								flags, &link);

		if (!data->desc) {

			dev_err(component->dev, "failed to prepare slave sg\n");

			ret = -ENOMEM;

			goto config_err;

		}



		if (!runtime->no_period_wakeup) {

			data->desc->callback = sprd_pcm_dma_complete;

			data->desc->callback_param = dma_private;

		}

	}



	devm_kfree(component->dev, sg);



	return 0;



config_err:

	devm_kfree(component->dev, sg);

sg_err:

	sprd_pcm_release_dma_channel(substream);

	return ret;

}



static int sprd_pcm_hw_free(struct snd_pcm_substream *substream)

{

	snd_pcm_set_runtime_buffer(substream, NULL);

	sprd_pcm_release_dma_channel(substream);



	return 0;

}



static int sprd_pcm_trigger(struct snd_pcm_substream *substream, int cmd)

{

	struct sprd_pcm_dma_private *dma_private =

		substream->runtime->private_data;

	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	struct snd_soc_component *component =

		snd_soc_rtdcom_lookup(rtd, DRV_NAME);

	int ret = 0, i;



	switch (cmd) {

	case SNDRV_PCM_TRIGGER_START:

		for (i = 0; i < dma_private->hw_chan; i++) {

			struct sprd_pcm_dma_data *data = &dma_private->data[i];



			if (!data->desc)

				continue;



			data->cookie = dmaengine_submit(data->desc);

			ret = dma_submit_error(data->cookie);

			if (ret) {

				dev_err(component->dev,

					"failed to submit dma request: %d\n",

					ret);

				return ret;

			}



			dma_async_issue_pending(data->chan);

		}



		break;

	case SNDRV_PCM_TRIGGER_RESUME:

	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:

		for (i = 0; i < dma_private->hw_chan; i++) {

			struct sprd_pcm_dma_data *data = &dma_private->data[i];



			if (data->chan)

				dmaengine_resume(data->chan);

		}



		break;

	case SNDRV_PCM_TRIGGER_STOP:

		for (i = 0; i < dma_private->hw_chan; i++) {

			struct sprd_pcm_dma_data *data = &dma_private->data[i];



			if (data->chan)

				dmaengine_terminate_async(data->chan);

		}



		break;

	case SNDRV_PCM_TRIGGER_SUSPEND:

	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:

		for (i = 0; i < dma_private->hw_chan; i++) {

			struct sprd_pcm_dma_data *data = &dma_private->data[i];



			if (data->chan)

				dmaengine_pause(data->chan);

		}



		break;

	default:

		ret = -EINVAL;

	}



	return ret;

}



static snd_pcm_uframes_t sprd_pcm_pointer(struct snd_pcm_substream *substream)

{

	struct snd_pcm_runtime *runtime = substream->runtime;

	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	struct sprd_pcm_dma_private *dma_private = runtime->private_data;

	struct snd_soc_component *component =

		snd_soc_rtdcom_lookup(rtd, DRV_NAME);

	int pointer[SPRD_PCM_CHANNEL_MAX];

	int bytes_of_pointer = 0, sel_max = 0, i;

	snd_pcm_uframes_t x;

	struct dma_tx_state state;

	enum dma_status status;



	for (i = 0; i < dma_private->hw_chan; i++) {

		struct sprd_pcm_dma_data *data = &dma_private->data[i];



		if (!data->chan)

			continue;



		status = dmaengine_tx_status(data->chan, data->cookie, &state);

		if (status == DMA_ERROR) {

			dev_err(component->dev,

				"failed to get dma channel %d status\n", i);

			return 0;

		}



		/*

		 * We just get current transfer address from the DMA engine, so

		 * we need convert to current pointer.

		 */

		pointer[i] = state.residue - runtime->dma_addr -

			i * dma_private->dma_addr_offset;



		if (i == 0) {

			bytes_of_pointer = pointer[i];

			sel_max = pointer[i] < data->pre_pointer ? 1 : 0;

		} else {

			sel_max ^= pointer[i] < data->pre_pointer ? 1 : 0;



			if (sel_max)

				bytes_of_pointer =

					max(pointer[i], pointer[i - 1]) << 1;

			else

				bytes_of_pointer =

					min(pointer[i], pointer[i - 1]) << 1;

		}



		data->pre_pointer = pointer[i];

	}



	x = bytes_to_frames(runtime, bytes_of_pointer);

	if (x == runtime->buffer_size)

		x = 0;



	return x;

}



static int sprd_pcm_mmap(struct snd_pcm_substream *substream,

			 struct vm_area_struct *vma)

{

	struct snd_pcm_runtime *runtime = substream->runtime;



	vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);

	return remap_pfn_range(vma, vma->vm_start,

			       runtime->dma_addr >> PAGE_SHIFT,

			       vma->vm_end - vma->vm_start,

			       vma->vm_page_prot);

}



static struct snd_pcm_ops sprd_pcm_ops = {

	.open = sprd_pcm_open,

	.close = sprd_pcm_close,

	.ioctl = snd_pcm_lib_ioctl,

	.hw_params = sprd_pcm_hw_params,

	.hw_free = sprd_pcm_hw_free,

	.trigger = sprd_pcm_trigger,

	.pointer = sprd_pcm_pointer,

	.mmap = sprd_pcm_mmap,

};



static int sprd_pcm_new(struct snd_soc_pcm_runtime *rtd)

{

	struct snd_card *card = rtd->card->snd_card;

	struct snd_pcm *pcm = rtd->pcm;

	struct snd_pcm_substream *substream;

	int ret;



	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));

	if (ret)

		return ret;



	substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;

	if (substream) {

		ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, card->dev,

					  sprd_pcm_hardware.buffer_bytes_max,

					  &substream->dma_buffer);

		if (ret) {

			dev_err(card->dev,

				"can't alloc playback dma buffer: %d\n", ret);

			return ret;

		}

	}



	substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;

	if (substream) {

		ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, card->dev,

					  sprd_pcm_hardware.buffer_bytes_max,

					  &substream->dma_buffer);

		if (ret) {

			dev_err(card->dev,

				"can't alloc capture dma buffer: %d\n", ret);

			snd_dma_free_pages(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream->dma_buffer);

			return ret;

		}

	}



	return 0;

}



static void sprd_pcm_free(struct snd_pcm *pcm)

{

	struct snd_pcm_substream *substream;

	int i;



	for (i = 0; i < ARRAY_SIZE(pcm->streams); i++) {

		substream = pcm->streams[i].substream;

		if (substream) {

			snd_dma_free_pages(&substream->dma_buffer);

			substream->dma_buffer.area = NULL;

			substream->dma_buffer.addr = 0;

		}

	}

}



static const struct snd_soc_component_driver sprd_soc_component = {

	.name		= DRV_NAME,

	.ops		= &sprd_pcm_ops,

	.pcm_new	= sprd_pcm_new,

	.pcm_free	= sprd_pcm_free,

};



static int sprd_soc_platform_probe(struct platform_device *pdev)

{

	int ret;



	ret = devm_snd_soc_register_component(&pdev->dev, &sprd_soc_component,

					      NULL, 0);

	if (ret)

		dev_err(&pdev->dev, "could not register platform:%d\n", ret);



	return ret;

}



static const struct of_device_id sprd_pcm_of_match[] = {

	{ .compatible = "sprd,pcm-platform", },

	{ },

};

MODULE_DEVICE_TABLE(of, sprd_pcm_of_match);



static struct platform_driver sprd_pcm_driver = {

	.driver = {

		.name = "sprd-pcm-audio",

		.of_match_table = sprd_pcm_of_match,

	},



	.probe = sprd_soc_platform_probe,

};



module_platform_driver(sprd_pcm_driver);



MODULE_DESCRIPTION("Spreadtrum ASoC PCM DMA");

MODULE_LICENSE("GPL v2");

MODULE_ALIAS("platform:sprd-audio");