[mirror_ubuntu-hirsute-kernel.git] / sound / arm / pxa2xx-pcm-lib.c

// SPDX-License-Identifier: GPL-2.0-only

#include <linux/slab.h>
#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/dma/pxa-dma.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/pxa2xx-lib.h>
#include <sound/dmaengine_pcm.h>

static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
	.info			= SNDRV_PCM_INFO_MMAP |
				  SNDRV_PCM_INFO_MMAP_VALID |
				  SNDRV_PCM_INFO_INTERLEAVED |
				  SNDRV_PCM_INFO_PAUSE |
				  SNDRV_PCM_INFO_RESUME,
	.formats		= SNDRV_PCM_FMTBIT_S16_LE |
				  SNDRV_PCM_FMTBIT_S24_LE |
				  SNDRV_PCM_FMTBIT_S32_LE,
	.period_bytes_min	= 32,
	.period_bytes_max	= 8192 - 32,
	.periods_min		= 1,
	.periods_max		= 256,
	.buffer_bytes_max	= 128 * 1024,
	.fifo_size		= 32,
};

int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
			 struct snd_pcm_hw_params *params)
{
	struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_dmaengine_dai_dma_data *dma_params;
	struct dma_slave_config config;
	int ret;

	dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	if (!dma_params)
		return 0;

	ret = snd_hwparams_to_dma_slave_config(substream, params, &config);
	if (ret)
		return ret;

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

	ret = dmaengine_slave_config(chan, &config);
	if (ret)
		return ret;

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);

	return 0;
}
EXPORT_SYMBOL(pxa2xx_pcm_hw_params);

int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
{
	snd_pcm_set_runtime_buffer(substream, NULL);
	return 0;
}
EXPORT_SYMBOL(pxa2xx_pcm_hw_free);

int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	return snd_dmaengine_pcm_trigger(substream, cmd);
}
EXPORT_SYMBOL(pxa2xx_pcm_trigger);

snd_pcm_uframes_t
pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
{
	return snd_dmaengine_pcm_pointer(substream);
}
EXPORT_SYMBOL(pxa2xx_pcm_pointer);

int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
{
	return 0;
}
EXPORT_SYMBOL(pxa2xx_pcm_prepare);

int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_dmaengine_dai_dma_data *dma_params;
	int ret;

	runtime->hw = pxa2xx_pcm_hardware;

	dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	if (!dma_params)
		return 0;

	/*
	 * For mysterious reasons (and despite what the manual says)
	 * playback samples are lost if the DMA count is not a multiple
	 * of the DMA burst size.  Let's add a rule to enforce that.
	 */
	ret = snd_pcm_hw_constraint_step(runtime, 0,
		SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
	if (ret)
		return ret;

	ret = snd_pcm_hw_constraint_step(runtime, 0,
		SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
	if (ret)
		return ret;

	ret = snd_pcm_hw_constraint_integer(runtime,
					    SNDRV_PCM_HW_PARAM_PERIODS);
	if (ret < 0)
		return ret;

	return snd_dmaengine_pcm_open(
		substream, dma_request_slave_channel(rtd->cpu_dai->dev,
						     dma_params->chan_name));
}
EXPORT_SYMBOL(pxa2xx_pcm_open);

int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
{
	return snd_dmaengine_pcm_close_release_chan(substream);
}
EXPORT_SYMBOL(pxa2xx_pcm_close);

int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
	struct vm_area_struct *vma)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	return dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area,
			   runtime->dma_addr, runtime->dma_bytes);
}
EXPORT_SYMBOL(pxa2xx_pcm_mmap);

int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
{
	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	struct snd_dma_buffer *buf = &substream->dma_buffer;
	size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	buf->dev.dev = pcm->card->dev;
	buf->private_data = NULL;
	buf->area = dma_alloc_wc(pcm->card->dev, size, &buf->addr, GFP_KERNEL);
	if (!buf->area)
		return -ENOMEM;
	buf->bytes = size;
	return 0;
}
EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);

void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
{
	struct snd_pcm_substream *substream;
	struct snd_dma_buffer *buf;
	int stream;

	for (stream = 0; stream < 2; stream++) {
		substream = pcm->streams[stream].substream;
		if (!substream)
			continue;
		buf = &substream->dma_buffer;
		if (!buf->area)
			continue;
		dma_free_wc(pcm->card->dev, buf->bytes, buf->area, buf->addr);
		buf->area = NULL;
	}
}
EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);

int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
	struct snd_card *card = rtd->card->snd_card;
	struct snd_pcm *pcm = rtd->pcm;
	int ret;

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

	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
		ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_PLAYBACK);
		if (ret)
			goto out;
	}

	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
		ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_CAPTURE);
		if (ret)
			goto out;
	}
 out:
	return ret;
}
EXPORT_SYMBOL(pxa2xx_soc_pcm_new);

const struct snd_pcm_ops pxa2xx_pcm_ops = {
	.open		= pxa2xx_pcm_open,
	.close		= pxa2xx_pcm_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= pxa2xx_pcm_hw_params,
	.hw_free	= pxa2xx_pcm_hw_free,
	.prepare	= pxa2xx_pcm_prepare,
	.trigger	= pxa2xx_pcm_trigger,
	.pointer	= pxa2xx_pcm_pointer,
	.mmap		= pxa2xx_pcm_mmap,
};
EXPORT_SYMBOL(pxa2xx_pcm_ops);

MODULE_AUTHOR("Nicolas Pitre");
MODULE_DESCRIPTION("Intel PXA2xx sound library");
MODULE_LICENSE("GPL");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
a6d77317	2
5a0e3ad6	3	#include <linux/slab.h>
a6d77317 DB	4	#include <linux/module.h>
a6d77317 DB	5	#include <linux/dma-mapping.h>
d65a1458	6	#include <linux/dmaengine.h>
58ceb57e	7	#include <linux/dma/pxa-dma.h>
a6d77317 DB	8
	9	#include <sound/core.h>
	10	#include <sound/pcm.h>
	11	#include <sound/pcm_params.h>
	12	#include <sound/pxa2xx-lib.h>
d65a1458	13	#include <sound/dmaengine_pcm.h>
a6d77317	14
a6d77317 DB	15	static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
	16	.info = SNDRV_PCM_INFO_MMAP \|
	17	SNDRV_PCM_INFO_MMAP_VALID \|
	18	SNDRV_PCM_INFO_INTERLEAVED \|
	19	SNDRV_PCM_INFO_PAUSE \|
	20	SNDRV_PCM_INFO_RESUME,
	21	.formats = SNDRV_PCM_FMTBIT_S16_LE \|
456ec808 DM	22	SNDRV_PCM_FMTBIT_S24_LE \|
456ec808 DM	23	SNDRV_PCM_FMTBIT_S32_LE,
a6d77317 DB	24	.period_bytes_min = 32,
	25	.period_bytes_max = 8192 - 32,
	26	.periods_min = 1,
58ceb57e	27	.periods_max = 256,
a6d77317 DB	28	.buffer_bytes_max = 128 * 1024,
	29	.fifo_size = 32,
	30	};
	31
a7160670 DM	32	int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
a7160670 DM	33	struct snd_pcm_hw_params *params)
a6d77317	34	{
58ceb57e DM	35	struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
	36	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	37	struct snd_dmaengine_dai_dma_data *dma_params;
	38	struct dma_slave_config config;
	39	int ret;
	40
	41	dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	42	if (!dma_params)
	43	return 0;
d65a1458	44
58ceb57e DM	45	ret = snd_hwparams_to_dma_slave_config(substream, params, &config);
	46	if (ret)
	47	return ret;
d65a1458	48
58ceb57e DM	49	snd_dmaengine_pcm_set_config_from_dai_data(substream,
	50	snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
	51	&config);
a6d77317	52
58ceb57e DM	53	ret = dmaengine_slave_config(chan, &config);
	54	if (ret)
	55	return ret;
a6d77317	56
58ceb57e	57	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
a6d77317 DB	58
	59	return 0;
	60	}
a7160670	61	EXPORT_SYMBOL(pxa2xx_pcm_hw_params);
a6d77317	62
a7160670	63	int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
a6d77317	64	{
a6d77317 DB	65	snd_pcm_set_runtime_buffer(substream, NULL);
	66	return 0;
	67	}
a7160670	68	EXPORT_SYMBOL(pxa2xx_pcm_hw_free);
a6d77317 DB	69
	70	int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	71	{
58ceb57e	72	return snd_dmaengine_pcm_trigger(substream, cmd);
a6d77317 DB	73	}
	74	EXPORT_SYMBOL(pxa2xx_pcm_trigger);
	75
	76	snd_pcm_uframes_t
	77	pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
	78	{
58ceb57e	79	return snd_dmaengine_pcm_pointer(substream);
a6d77317 DB	80	}
	81	EXPORT_SYMBOL(pxa2xx_pcm_pointer);
	82
a7160670	83	int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
a6d77317	84	{
a6d77317 DB	85	return 0;
a6d77317 DB	86	}
a7160670	87	EXPORT_SYMBOL(pxa2xx_pcm_prepare);
a6d77317	88
a7160670	89	int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
a6d77317	90	{
58ceb57e	91	struct snd_soc_pcm_runtime *rtd = substream->private_data;
a6d77317	92	struct snd_pcm_runtime *runtime = substream->runtime;
58ceb57e	93	struct snd_dmaengine_dai_dma_data *dma_params;
a6d77317 DB	94	int ret;
	95
	96	runtime->hw = pxa2xx_pcm_hardware;
	97
58ceb57e DM	98	dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	99	if (!dma_params)
	100	return 0;
	101
a6d77317 DB	102	/*
	103	* For mysterious reasons (and despite what the manual says)
	104	* playback samples are lost if the DMA count is not a multiple
	105	* of the DMA burst size. Let's add a rule to enforce that.
	106	*/
	107	ret = snd_pcm_hw_constraint_step(runtime, 0,
	108	SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
	109	if (ret)
58ceb57e	110	return ret;
a6d77317 DB	111
	112	ret = snd_pcm_hw_constraint_step(runtime, 0,
	113	SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
	114	if (ret)
58ceb57e	115	return ret;
a6d77317 DB	116
	117	ret = snd_pcm_hw_constraint_integer(runtime,
	118	SNDRV_PCM_HW_PARAM_PERIODS);
	119	if (ret < 0)
58ceb57e	120	return ret;
a6d77317	121
8f54061d RJ	122	return snd_dmaengine_pcm_open(
	123	substream, dma_request_slave_channel(rtd->cpu_dai->dev,
	124	dma_params->chan_name));
a6d77317	125	}
a7160670	126	EXPORT_SYMBOL(pxa2xx_pcm_open);
a6d77317	127
a7160670	128	int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
a6d77317	129	{
58ceb57e	130	return snd_dmaengine_pcm_close_release_chan(substream);
a6d77317	131	}
a7160670	132	EXPORT_SYMBOL(pxa2xx_pcm_close);
a6d77317 DB	133
	134	int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
	135	struct vm_area_struct *vma)
	136	{
	137	struct snd_pcm_runtime *runtime = substream->runtime;
f6e45661 LR	138	return dma_mmap_wc(substream->pcm->card->dev, vma, runtime->dma_area,
f6e45661 LR	139	runtime->dma_addr, runtime->dma_bytes);
a6d77317 DB	140	}
	141	EXPORT_SYMBOL(pxa2xx_pcm_mmap);
	142
	143	int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
	144	{
	145	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	146	struct snd_dma_buffer *buf = &substream->dma_buffer;
	147	size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
	148	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	149	buf->dev.dev = pcm->card->dev;
	150	buf->private_data = NULL;
f6e45661	151	buf->area = dma_alloc_wc(pcm->card->dev, size, &buf->addr, GFP_KERNEL);
a6d77317 DB	152	if (!buf->area)
	153	return -ENOMEM;
	154	buf->bytes = size;
	155	return 0;
	156	}
	157	EXPORT_SYMBOL(pxa2xx_pcm_preallocate_dma_buffer);
	158
	159	void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
	160	{
	161	struct snd_pcm_substream *substream;
	162	struct snd_dma_buffer *buf;
	163	int stream;
	164
	165	for (stream = 0; stream < 2; stream++) {
	166	substream = pcm->streams[stream].substream;
	167	if (!substream)
	168	continue;
	169	buf = &substream->dma_buffer;
	170	if (!buf->area)
	171	continue;
f6e45661	172	dma_free_wc(pcm->card->dev, buf->bytes, buf->area, buf->addr);
a6d77317 DB	173	buf->area = NULL;
	174	}
	175	}
	176	EXPORT_SYMBOL(pxa2xx_pcm_free_dma_buffers);
	177
7afd1b0b DM	178	int pxa2xx_soc_pcm_new(struct snd_soc_pcm_runtime *rtd)
	179	{
	180	struct snd_card *card = rtd->card->snd_card;
	181	struct snd_pcm *pcm = rtd->pcm;
	182	int ret;
	183
	184	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
	185	if (ret)
	186	return ret;
	187
	188	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
	189	ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
	190	SNDRV_PCM_STREAM_PLAYBACK);
	191	if (ret)
	192	goto out;
	193	}
	194
	195	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
	196	ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
	197	SNDRV_PCM_STREAM_CAPTURE);
	198	if (ret)
	199	goto out;
	200	}
	201	out:
	202	return ret;
	203	}
	204	EXPORT_SYMBOL(pxa2xx_soc_pcm_new);
	205
	206	const struct snd_pcm_ops pxa2xx_pcm_ops = {
	207	.open = pxa2xx_pcm_open,
	208	.close = pxa2xx_pcm_close,
	209	.ioctl = snd_pcm_lib_ioctl,
	210	.hw_params = pxa2xx_pcm_hw_params,
	211	.hw_free = pxa2xx_pcm_hw_free,
	212	.prepare = pxa2xx_pcm_prepare,
	213	.trigger = pxa2xx_pcm_trigger,
	214	.pointer = pxa2xx_pcm_pointer,
	215	.mmap = pxa2xx_pcm_mmap,
	216	};
	217	EXPORT_SYMBOL(pxa2xx_pcm_ops);
	218
a6d77317 DB	219	MODULE_AUTHOR("Nicolas Pitre");
	220	MODULE_DESCRIPTION("Intel PXA2xx sound library");
	221	MODULE_LICENSE("GPL");