ASoC: sprd: Add Spreadtrum audio DMA platfrom driver (42fea318) · Commits · 戴 / test

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");

Admin message