[deliverable/linux.git] / sound / soc / atmel / atmel-pcm-dma.c

/*
 * 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
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#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
3951e4aa BS	1	/*
	2	* atmel-pcm-dma.c -- ALSA PCM DMA support for the Atmel SoC.
	3	*
	4	* Copyright (C) 2012 Atmel
	5	*
	6	* Author: Bo Shen <voice.shen@atmel.com>
	7	*
	8	* Based on atmel-pcm by:
	9	* Sedji Gaouaou <sedji.gaouaou@atmel.com>
	10	* Copyright 2008 Atmel
	11	*
	12	* This program is free software; you can redistribute it and/or modify
	13	* it under the terms of the GNU General Public License as published by
	14	* the Free Software Foundation; either version 2 of the License, or
	15	* (at your option) any later version.
	16	*
	17	* This program is distributed in the hope that it will be useful,
	18	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	20	* GNU General Public License for more details.
	21	*
	22	* You should have received a copy of the GNU General Public License
	23	* along with this program; if not, write to the Free Software
	24	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	25	*/
	26
	27	#include <linux/module.h>
	28	#include <linux/init.h>
	29	#include <linux/platform_device.h>
	30	#include <linux/slab.h>
	31	#include <linux/dma-mapping.h>
	32	#include <linux/dmaengine.h>
	33	#include <linux/atmel-ssc.h>
	34	#include <linux/platform_data/dma-atmel.h>
	35
	36	#include <sound/core.h>
	37	#include <sound/pcm.h>
	38	#include <sound/pcm_params.h>
	39	#include <sound/soc.h>
	40	#include <sound/dmaengine_pcm.h>
	41
	42	#include "atmel-pcm.h"
	43
	44	/--------------------------------------------------------------------------\
	45	* Hardware definition
	46	\--------------------------------------------------------------------------/
	47	static const struct snd_pcm_hardware atmel_pcm_dma_hardware = {
	48	.info = SNDRV_PCM_INFO_MMAP \|
	49	SNDRV_PCM_INFO_MMAP_VALID \|
	50	SNDRV_PCM_INFO_INTERLEAVED \|
	51	SNDRV_PCM_INFO_RESUME \|
	52	SNDRV_PCM_INFO_PAUSE,
3951e4aa BS	53	.period_bytes_min = 256, /* lighting DMA overhead */
	54	.period_bytes_max = 2 * 0xffff, /* if 2 bytes format */
	55	.periods_min = 8,
	56	.periods_max = 1024, /* no limit */
c14e2591	57	.buffer_bytes_max = 512 * 1024,
3951e4aa BS	58	};
	59
	60	/**
	61	* atmel_pcm_dma_irq: SSC interrupt handler for DMAENGINE enabled SSC
	62	*
	63	* We use DMAENGINE to send/receive data to/from SSC so this ISR is only to
	64	* check if any overrun occured.
	65	*/
	66	static void atmel_pcm_dma_irq(u32 ssc_sr,
	67	struct snd_pcm_substream *substream)
	68	{
5fe668a1	69	struct snd_soc_pcm_runtime *rtd = substream->private_data;
3951e4aa BS	70	struct atmel_pcm_dma_params *prtd;
3951e4aa BS	71
5fe668a1	72	prtd = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
3951e4aa BS	73
	74	if (ssc_sr & prtd->mask->ssc_error) {
	75	if (snd_pcm_running(substream))
	76	pr_warn("atmel-pcm: buffer %s on %s (SSC_SR=%#x)\n",
	77	substream->stream == SNDRV_PCM_STREAM_PLAYBACK
	78	? "underrun" : "overrun", prtd->name,
	79	ssc_sr);
	80
	81	/* stop RX and capture: will be enabled again at restart */
	82	ssc_writex(prtd->ssc->regs, SSC_CR, prtd->mask->ssc_disable);
1fb8510c	83	snd_pcm_stop_xrun(substream);
3951e4aa BS	84
	85	/* now drain RHR and read status to remove xrun condition */
	86	ssc_readx(prtd->ssc->regs, SSC_RHR);
	87	ssc_readx(prtd->ssc->regs, SSC_SR);
	88	}
	89	}
	90
3951e4aa	91	static int atmel_pcm_configure_dma(struct snd_pcm_substream *substream,
95e0e07e	92	struct snd_pcm_hw_params params, struct dma_slave_config slave_config)
3951e4aa	93	{
95e0e07e BS	94	struct snd_soc_pcm_runtime *rtd = substream->private_data;
95e0e07e BS	95	struct atmel_pcm_dma_params *prtd;
3951e4aa	96	struct ssc_device *ssc;
3951e4aa BS	97	int ret;
3951e4aa BS	98
95e0e07e	99	prtd = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
3951e4aa BS	100	ssc = prtd->ssc;
3951e4aa BS	101
95e0e07e	102	ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
3951e4aa BS	103	if (ret) {
	104	pr_err("atmel-pcm: hwparams to dma slave configure failed\n");
	105	return ret;
	106	}
	107
56bbd86c BS	108	slave_config->dst_addr = ssc->phybase + SSC_THR;
	109	slave_config->dst_maxburst = 1;
	110
	111	slave_config->src_addr = ssc->phybase + SSC_RHR;
	112	slave_config->src_maxburst = 1;
3951e4aa BS	113
	114	prtd->dma_intr_handler = atmel_pcm_dma_irq;
	115
	116	return 0;
3951e4aa BS	117	}
3951e4aa BS	118
95e0e07e BS	119	static const struct snd_dmaengine_pcm_config atmel_dmaengine_pcm_config = {
	120	.prepare_slave_config = atmel_pcm_configure_dma,
	121	.pcm_hardware = &atmel_pcm_dma_hardware,
c14e2591	122	.prealloc_buffer_size = 64 * 1024,
3951e4aa BS	123	};
	124
	125	int atmel_pcm_dma_platform_register(struct device *dev)
	126	{
acde50a7	127	return snd_dmaengine_pcm_register(dev, &atmel_dmaengine_pcm_config, 0);
3951e4aa BS	128	}
	129	EXPORT_SYMBOL(atmel_pcm_dma_platform_register);
	130
	131	void atmel_pcm_dma_platform_unregister(struct device *dev)
	132	{
95e0e07e	133	snd_dmaengine_pcm_unregister(dev);
3951e4aa BS	134	}
	135	EXPORT_SYMBOL(atmel_pcm_dma_platform_unregister);
	136
	137	MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>");
	138	MODULE_DESCRIPTION("Atmel DMA based PCM module");
	139	MODULE_LICENSE("GPL");