[mirror_ubuntu-jammy-kernel.git] / sound / soc / atmel / atmel-pcm-dma.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * atmel-pcm-dma.c  --  ALSA PCM DMA support for the Atmel SoC.
 *
 *  Copyright (C) 2012 Atmel
 *
 * Author: Bo Shen <voice.shen@atmel.com>
 *
 * Based on atmel-pcm by:
 * Sedji Gaouaou <sedji.gaouaou@atmel.com>
 * Copyright 2008 Atmel
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/atmel-ssc.h>
#include <linux/platform_data/dma-atmel.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/dmaengine_pcm.h>

#include "atmel-pcm.h"

/*--------------------------------------------------------------------------*\
 * Hardware definition
\*--------------------------------------------------------------------------*/
static const struct snd_pcm_hardware atmel_pcm_dma_hardware = {
	.info			= SNDRV_PCM_INFO_MMAP |
				  SNDRV_PCM_INFO_MMAP_VALID |
				  SNDRV_PCM_INFO_INTERLEAVED |
				  SNDRV_PCM_INFO_RESUME |
				  SNDRV_PCM_INFO_PAUSE,
	.period_bytes_min	= 256,		/* lighting DMA overhead */
	.period_bytes_max	= 2 * 0xffff,	/* if 2 bytes format */
	.periods_min		= 8,
	.periods_max		= 1024,		/* no limit */
	.buffer_bytes_max	= 512 * 1024,
};

/**
 * 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_stop_xrun(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 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;
}

static const struct snd_dmaengine_pcm_config atmel_dmaengine_pcm_config = {
	.prepare_slave_config = atmel_pcm_configure_dma,
	.pcm_hardware = &atmel_pcm_dma_hardware,
	.prealloc_buffer_size = 64 * 1024,
};

int atmel_pcm_dma_platform_register(struct device *dev)
{
	return snd_dmaengine_pcm_register(dev, &atmel_dmaengine_pcm_config, 0);
}
EXPORT_SYMBOL(atmel_pcm_dma_platform_register);

void atmel_pcm_dma_platform_unregister(struct device *dev)
{
	snd_dmaengine_pcm_unregister(dev);
}
EXPORT_SYMBOL(atmel_pcm_dma_platform_unregister);

MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>");
MODULE_DESCRIPTION("Atmel DMA based PCM module");
MODULE_LICENSE("GPL");
Commit	Line	Data
1a59d1b8	1	// SPDX-License-Identifier: GPL-2.0-or-later
3951e4aa BS	2	/*
	3	* atmel-pcm-dma.c -- ALSA PCM DMA support for the Atmel SoC.
	4	*
	5	* Copyright (C) 2012 Atmel
	6	*
	7	* Author: Bo Shen <voice.shen@atmel.com>
	8	*
	9	* Based on atmel-pcm by:
	10	* Sedji Gaouaou <sedji.gaouaou@atmel.com>
	11	* Copyright 2008 Atmel
3951e4aa BS	12	*/
	13
	14	#include <linux/module.h>
	15	#include <linux/init.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/slab.h>
	18	#include <linux/dma-mapping.h>
	19	#include <linux/dmaengine.h>
	20	#include <linux/atmel-ssc.h>
	21	#include <linux/platform_data/dma-atmel.h>
	22
	23	#include <sound/core.h>
	24	#include <sound/pcm.h>
	25	#include <sound/pcm_params.h>
	26	#include <sound/soc.h>
	27	#include <sound/dmaengine_pcm.h>
	28
	29	#include "atmel-pcm.h"
	30
	31	/--------------------------------------------------------------------------\
	32	* Hardware definition
	33	\--------------------------------------------------------------------------/
	34	static const struct snd_pcm_hardware atmel_pcm_dma_hardware = {
	35	.info = SNDRV_PCM_INFO_MMAP \|
	36	SNDRV_PCM_INFO_MMAP_VALID \|
	37	SNDRV_PCM_INFO_INTERLEAVED \|
	38	SNDRV_PCM_INFO_RESUME \|
	39	SNDRV_PCM_INFO_PAUSE,
3951e4aa BS	40	.period_bytes_min = 256, /* lighting DMA overhead */
	41	.period_bytes_max = 2 * 0xffff, /* if 2 bytes format */
	42	.periods_min = 8,
	43	.periods_max = 1024, /* no limit */
c14e2591	44	.buffer_bytes_max = 512 * 1024,
3951e4aa BS	45	};
	46
	47	/**
	48	* atmel_pcm_dma_irq: SSC interrupt handler for DMAENGINE enabled SSC
	49	*
	50	* We use DMAENGINE to send/receive data to/from SSC so this ISR is only to
	51	* check if any overrun occured.
	52	*/
	53	static void atmel_pcm_dma_irq(u32 ssc_sr,
	54	struct snd_pcm_substream *substream)
	55	{
5fe668a1	56	struct snd_soc_pcm_runtime *rtd = substream->private_data;
3951e4aa BS	57	struct atmel_pcm_dma_params *prtd;
3951e4aa BS	58
5fe668a1	59	prtd = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
3951e4aa BS	60
	61	if (ssc_sr & prtd->mask->ssc_error) {
	62	if (snd_pcm_running(substream))
	63	pr_warn("atmel-pcm: buffer %s on %s (SSC_SR=%#x)\n",
	64	substream->stream == SNDRV_PCM_STREAM_PLAYBACK
	65	? "underrun" : "overrun", prtd->name,
	66	ssc_sr);
	67
	68	/* stop RX and capture: will be enabled again at restart */
	69	ssc_writex(prtd->ssc->regs, SSC_CR, prtd->mask->ssc_disable);
1fb8510c	70	snd_pcm_stop_xrun(substream);
3951e4aa BS	71
	72	/* now drain RHR and read status to remove xrun condition */
	73	ssc_readx(prtd->ssc->regs, SSC_RHR);
	74	ssc_readx(prtd->ssc->regs, SSC_SR);
	75	}
	76	}
	77
3951e4aa	78	static int atmel_pcm_configure_dma(struct snd_pcm_substream *substream,
95e0e07e	79	struct snd_pcm_hw_params params, struct dma_slave_config slave_config)
3951e4aa	80	{
95e0e07e BS	81	struct snd_soc_pcm_runtime *rtd = substream->private_data;
95e0e07e BS	82	struct atmel_pcm_dma_params *prtd;
3951e4aa	83	struct ssc_device *ssc;
3951e4aa BS	84	int ret;
3951e4aa BS	85
95e0e07e	86	prtd = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
3951e4aa BS	87	ssc = prtd->ssc;
3951e4aa BS	88
95e0e07e	89	ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
3951e4aa BS	90	if (ret) {
	91	pr_err("atmel-pcm: hwparams to dma slave configure failed\n");
	92	return ret;
	93	}
	94
56bbd86c BS	95	slave_config->dst_addr = ssc->phybase + SSC_THR;
	96	slave_config->dst_maxburst = 1;
	97
	98	slave_config->src_addr = ssc->phybase + SSC_RHR;
	99	slave_config->src_maxburst = 1;
3951e4aa BS	100
	101	prtd->dma_intr_handler = atmel_pcm_dma_irq;
	102
	103	return 0;
3951e4aa BS	104	}
3951e4aa BS	105
95e0e07e BS	106	static const struct snd_dmaengine_pcm_config atmel_dmaengine_pcm_config = {
	107	.prepare_slave_config = atmel_pcm_configure_dma,
	108	.pcm_hardware = &atmel_pcm_dma_hardware,
c14e2591	109	.prealloc_buffer_size = 64 * 1024,
3951e4aa BS	110	};
	111
	112	int atmel_pcm_dma_platform_register(struct device *dev)
	113	{
acde50a7	114	return snd_dmaengine_pcm_register(dev, &atmel_dmaengine_pcm_config, 0);
3951e4aa BS	115	}
	116	EXPORT_SYMBOL(atmel_pcm_dma_platform_register);
	117
	118	void atmel_pcm_dma_platform_unregister(struct device *dev)
	119	{
95e0e07e	120	snd_dmaengine_pcm_unregister(dev);
3951e4aa BS	121	}
	122	EXPORT_SYMBOL(atmel_pcm_dma_platform_unregister);
	123
	124	MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>");
	125	MODULE_DESCRIPTION("Atmel DMA based PCM module");
	126	MODULE_LICENSE("GPL");