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

/*
 * atmel-pcm.c  --  ALSA PCM interface for the Atmel atmel SoC.
 *
 *  Copyright (C) 2005 SAN People
 *  Copyright (C) 2008 Atmel
 *
 * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
 *
 * Based on at91-pcm. by:
 * Frank Mandarino <fmandarino@endrelia.com>
 * Copyright 2006 Endrelia Technologies Inc.
 *
 * Based on pxa2xx-pcm.c by:
 *
 * Author:	Nicolas Pitre
 * Created:	Nov 30, 2004
 * Copyright:	(C) 2004 MontaVista Software, Inc.
 *
 * 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/atmel_pdc.h>
#include <linux/atmel-ssc.h>

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

#include "atmel-pcm.h"


static int atmel_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 = ATMEL_SSC_DMABUF_SIZE;

	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	buf->dev.dev = pcm->card->dev;
	buf->private_data = NULL;
	buf->area = dma_alloc_coherent(pcm->card->dev, size,
			&buf->addr, GFP_KERNEL);
	pr_debug("atmel-pcm: alloc dma buffer: area=%p, addr=%p, size=%zu\n",
			(void *)buf->area, (void *)(long)buf->addr, size);

	if (!buf->area)
		return -ENOMEM;

	buf->bytes = size;
	return 0;
}

static int atmel_pcm_mmap(struct snd_pcm_substream *substream,
	struct vm_area_struct *vma)
{
	return remap_pfn_range(vma, vma->vm_start,
		       substream->dma_buffer.addr >> PAGE_SHIFT,
		       vma->vm_end - vma->vm_start, vma->vm_page_prot);
}

static int atmel_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) {
		pr_debug("atmel-pcm: allocating PCM playback DMA buffer\n");
		ret = atmel_pcm_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_PLAYBACK);
		if (ret)
			goto out;
	}

	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
		pr_debug("atmel-pcm: allocating PCM capture DMA buffer\n");
		ret = atmel_pcm_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_CAPTURE);
		if (ret)
			goto out;
	}
 out:
	return ret;
}

static void atmel_pcm_free(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_coherent(pcm->card->dev, buf->bytes,
				  buf->area, buf->addr);
		buf->area = NULL;
	}
}

/*--------------------------------------------------------------------------*\
 * Hardware definition
\*--------------------------------------------------------------------------*/
/* TODO: These values were taken from the AT91 platform driver, check
 *	 them against real values for AT32
 */
static const struct snd_pcm_hardware atmel_pcm_hardware = {
	.info			= SNDRV_PCM_INFO_MMAP |
				  SNDRV_PCM_INFO_MMAP_VALID |
				  SNDRV_PCM_INFO_INTERLEAVED |
				  SNDRV_PCM_INFO_PAUSE,
	.period_bytes_min	= 32,
	.period_bytes_max	= 8192,
	.periods_min		= 2,
	.periods_max		= 1024,
	.buffer_bytes_max	= ATMEL_SSC_DMABUF_SIZE,
};


/*--------------------------------------------------------------------------*\
 * Data types
\*--------------------------------------------------------------------------*/
struct atmel_runtime_data {
	struct atmel_pcm_dma_params *params;
	dma_addr_t dma_buffer;		/* physical address of dma buffer */
	dma_addr_t dma_buffer_end;	/* first address beyond DMA buffer */
	size_t period_size;

	dma_addr_t period_ptr;		/* physical address of next period */
};

/*--------------------------------------------------------------------------*\
 * ISR
\*--------------------------------------------------------------------------*/
static void atmel_pcm_dma_irq(u32 ssc_sr,
	struct snd_pcm_substream *substream)
{
	struct atmel_runtime_data *prtd = substream->runtime->private_data;
	struct atmel_pcm_dma_params *params = prtd->params;
	static int count;

	count++;

	if (ssc_sr & params->mask->ssc_endbuf) {
		pr_warn("atmel-pcm: buffer %s on %s (SSC_SR=%#x, count=%d)\n",
				substream->stream == SNDRV_PCM_STREAM_PLAYBACK
				? "underrun" : "overrun",
				params->name, ssc_sr, count);

		/* re-start the PDC */
		ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
			   params->mask->pdc_disable);
		prtd->period_ptr += prtd->period_size;
		if (prtd->period_ptr >= prtd->dma_buffer_end)
			prtd->period_ptr = prtd->dma_buffer;

		ssc_writex(params->ssc->regs, params->pdc->xpr,
			   prtd->period_ptr);
		ssc_writex(params->ssc->regs, params->pdc->xcr,
			   prtd->period_size / params->pdc_xfer_size);
		ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
			   params->mask->pdc_enable);
	}

	if (ssc_sr & params->mask->ssc_endx) {
		/* Load the PDC next pointer and counter registers */
		prtd->period_ptr += prtd->period_size;
		if (prtd->period_ptr >= prtd->dma_buffer_end)
			prtd->period_ptr = prtd->dma_buffer;

		ssc_writex(params->ssc->regs, params->pdc->xnpr,
			   prtd->period_ptr);
		ssc_writex(params->ssc->regs, params->pdc->xncr,
			   prtd->period_size / params->pdc_xfer_size);
	}

	snd_pcm_period_elapsed(substream);
}


/*--------------------------------------------------------------------------*\
 * PCM operations
\*--------------------------------------------------------------------------*/
static int atmel_pcm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct atmel_runtime_data *prtd = runtime->private_data;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	/* this may get called several times by oss emulation
	 * with different params */

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	runtime->dma_bytes = params_buffer_bytes(params);

	prtd->params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	prtd->params->dma_intr_handler = atmel_pcm_dma_irq;

	prtd->dma_buffer = runtime->dma_addr;
	prtd->dma_buffer_end = runtime->dma_addr + runtime->dma_bytes;
	prtd->period_size = params_period_bytes(params);

	pr_debug("atmel-pcm: "
		"hw_params: DMA for %s initialized "
		"(dma_bytes=%zu, period_size=%zu)\n",
		prtd->params->name,
		runtime->dma_bytes,
		prtd->period_size);
	return 0;
}

static int atmel_pcm_hw_free(struct snd_pcm_substream *substream)
{
	struct atmel_runtime_data *prtd = substream->runtime->private_data;
	struct atmel_pcm_dma_params *params = prtd->params;

	if (params != NULL) {
		ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
			   params->mask->pdc_disable);
		prtd->params->dma_intr_handler = NULL;
	}

	return 0;
}

static int atmel_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct atmel_runtime_data *prtd = substream->runtime->private_data;
	struct atmel_pcm_dma_params *params = prtd->params;

	ssc_writex(params->ssc->regs, SSC_IDR,
		   params->mask->ssc_endx | params->mask->ssc_endbuf);
	ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
		   params->mask->pdc_disable);
	return 0;
}

static int atmel_pcm_trigger(struct snd_pcm_substream *substream,
	int cmd)
{
	struct snd_pcm_runtime *rtd = substream->runtime;
	struct atmel_runtime_data *prtd = rtd->private_data;
	struct atmel_pcm_dma_params *params = prtd->params;
	int ret = 0;

	pr_debug("atmel-pcm:buffer_size = %ld,"
		"dma_area = %p, dma_bytes = %zu\n",
		rtd->buffer_size, rtd->dma_area, rtd->dma_bytes);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		prtd->period_ptr = prtd->dma_buffer;

		ssc_writex(params->ssc->regs, params->pdc->xpr,
			   prtd->period_ptr);
		ssc_writex(params->ssc->regs, params->pdc->xcr,
			   prtd->period_size / params->pdc_xfer_size);

		prtd->period_ptr += prtd->period_size;
		ssc_writex(params->ssc->regs, params->pdc->xnpr,
			   prtd->period_ptr);
		ssc_writex(params->ssc->regs, params->pdc->xncr,
			   prtd->period_size / params->pdc_xfer_size);

		pr_debug("atmel-pcm: trigger: "
			"period_ptr=%lx, xpr=%u, "
			"xcr=%u, xnpr=%u, xncr=%u\n",
			(unsigned long)prtd->period_ptr,
			ssc_readx(params->ssc->regs, params->pdc->xpr),
			ssc_readx(params->ssc->regs, params->pdc->xcr),
			ssc_readx(params->ssc->regs, params->pdc->xnpr),
			ssc_readx(params->ssc->regs, params->pdc->xncr));

		ssc_writex(params->ssc->regs, SSC_IER,
			   params->mask->ssc_endx | params->mask->ssc_endbuf);
		ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
			   params->mask->pdc_enable);

		pr_debug("sr=%u imr=%u\n",
			ssc_readx(params->ssc->regs, SSC_SR),
			ssc_readx(params->ssc->regs, SSC_IER));
		break;		/* SNDRV_PCM_TRIGGER_START */

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
			   params->mask->pdc_disable);
		break;

	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
			   params->mask->pdc_enable);
		break;

	default:
		ret = -EINVAL;
	}

	return ret;
}

static snd_pcm_uframes_t atmel_pcm_pointer(
	struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct atmel_runtime_data *prtd = runtime->private_data;
	struct atmel_pcm_dma_params *params = prtd->params;
	dma_addr_t ptr;
	snd_pcm_uframes_t x;

	ptr = (dma_addr_t) ssc_readx(params->ssc->regs, params->pdc->xpr);
	x = bytes_to_frames(runtime, ptr - prtd->dma_buffer);

	if (x == runtime->buffer_size)
		x = 0;

	return x;
}

static int atmel_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct atmel_runtime_data *prtd;
	int ret = 0;

	snd_soc_set_runtime_hwparams(substream, &atmel_pcm_hardware);

	/* ensure that buffer size is a multiple of period size */
	ret = snd_pcm_hw_constraint_integer(runtime,
						SNDRV_PCM_HW_PARAM_PERIODS);
	if (ret < 0)
		goto out;

	prtd = kzalloc(sizeof(struct atmel_runtime_data), GFP_KERNEL);
	if (prtd == NULL) {
		ret = -ENOMEM;
		goto out;
	}
	runtime->private_data = prtd;

 out:
	return ret;
}

static int atmel_pcm_close(struct snd_pcm_substream *substream)
{
	struct atmel_runtime_data *prtd = substream->runtime->private_data;

	kfree(prtd);
	return 0;
}

static const struct snd_pcm_ops atmel_pcm_ops = {
	.open		= atmel_pcm_open,
	.close		= atmel_pcm_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= atmel_pcm_hw_params,
	.hw_free	= atmel_pcm_hw_free,
	.prepare	= atmel_pcm_prepare,
	.trigger	= atmel_pcm_trigger,
	.pointer	= atmel_pcm_pointer,
	.mmap		= atmel_pcm_mmap,
};

static struct snd_soc_platform_driver atmel_soc_platform = {
	.ops		= &atmel_pcm_ops,
	.pcm_new	= atmel_pcm_new,
	.pcm_free	= atmel_pcm_free,
};

int atmel_pcm_pdc_platform_register(struct device *dev)
{
	return snd_soc_register_platform(dev, &atmel_soc_platform);
}
EXPORT_SYMBOL(atmel_pcm_pdc_platform_register);

void atmel_pcm_pdc_platform_unregister(struct device *dev)
{
	snd_soc_unregister_platform(dev);
}
EXPORT_SYMBOL(atmel_pcm_pdc_platform_unregister);

MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
MODULE_DESCRIPTION("Atmel PCM module");
MODULE_LICENSE("GPL");
Commit	Line	Data
92dfa619 BS	1	/*
	2	* atmel-pcm.c -- ALSA PCM interface for the Atmel atmel SoC.
	3	*
	4	* Copyright (C) 2005 SAN People
	5	* Copyright (C) 2008 Atmel
	6	*
	7	* Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
	8	*
	9	* Based on at91-pcm. by:
	10	* Frank Mandarino <fmandarino@endrelia.com>
	11	* Copyright 2006 Endrelia Technologies Inc.
	12	*
	13	* Based on pxa2xx-pcm.c by:
	14	*
	15	* Author: Nicolas Pitre
	16	* Created: Nov 30, 2004
	17	* Copyright: (C) 2004 MontaVista Software, Inc.
	18	*
	19	* This program is free software; you can redistribute it and/or modify
	20	* it under the terms of the GNU General Public License as published by
	21	* the Free Software Foundation; either version 2 of the License, or
	22	* (at your option) any later version.
	23	*
	24	* This program is distributed in the hope that it will be useful,
	25	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	26	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	27	* GNU General Public License for more details.
	28	*
	29	* You should have received a copy of the GNU General Public License
	30	* along with this program; if not, write to the Free Software
	31	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	32	*/
	33
	34	#include <linux/module.h>
	35	#include <linux/init.h>
	36	#include <linux/platform_device.h>
	37	#include <linux/slab.h>
	38	#include <linux/dma-mapping.h>
	39	#include <linux/atmel_pdc.h>
	40	#include <linux/atmel-ssc.h>
	41
	42	#include <sound/core.h>
	43	#include <sound/pcm.h>
	44	#include <sound/pcm_params.h>
	45	#include <sound/soc.h>
	46
	47	#include "atmel-pcm.h"
	48
	49
488cb533 AB	50	static int atmel_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
	51	int stream)
	52	{
	53	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	54	struct snd_dma_buffer *buf = &substream->dma_buffer;
	55	size_t size = ATMEL_SSC_DMABUF_SIZE;
	56
	57	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	58	buf->dev.dev = pcm->card->dev;
	59	buf->private_data = NULL;
	60	buf->area = dma_alloc_coherent(pcm->card->dev, size,
	61	&buf->addr, GFP_KERNEL);
	62	pr_debug("atmel-pcm: alloc dma buffer: area=%p, addr=%p, size=%zu\n",
	63	(void )buf->area, (void )(long)buf->addr, size);
	64
	65	if (!buf->area)
	66	return -ENOMEM;
	67
	68	buf->bytes = size;
	69	return 0;
	70	}
	71
	72	static int atmel_pcm_mmap(struct snd_pcm_substream *substream,
	73	struct vm_area_struct *vma)
	74	{
	75	return remap_pfn_range(vma, vma->vm_start,
	76	substream->dma_buffer.addr >> PAGE_SHIFT,
	77	vma->vm_end - vma->vm_start, vma->vm_page_prot);
	78	}
	79
	80	static int atmel_pcm_new(struct snd_soc_pcm_runtime *rtd)
	81	{
	82	struct snd_card *card = rtd->card->snd_card;
	83	struct snd_pcm *pcm = rtd->pcm;
	84	int ret;
	85
	86	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
	87	if (ret)
	88	return ret;
	89
	90	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
	91	pr_debug("atmel-pcm: allocating PCM playback DMA buffer\n");
	92	ret = atmel_pcm_preallocate_dma_buffer(pcm,
	93	SNDRV_PCM_STREAM_PLAYBACK);
	94	if (ret)
	95	goto out;
	96	}
	97
	98	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
	99	pr_debug("atmel-pcm: allocating PCM capture DMA buffer\n");
	100	ret = atmel_pcm_preallocate_dma_buffer(pcm,
	101	SNDRV_PCM_STREAM_CAPTURE);
	102	if (ret)
	103	goto out;
	104	}
	105	out:
	106	return ret;
	107	}
	108
	109	static void atmel_pcm_free(struct snd_pcm *pcm)
	110	{
	111	struct snd_pcm_substream *substream;
	112	struct snd_dma_buffer *buf;
	113	int stream;
114
115	for (stream = 0; stream < 2; stream++) {
116	substream = pcm->streams[stream].substream;
117	if (!substream)
118	continue;
119
120	buf = &substream->dma_buffer;
121	if (!buf->area)
122	continue;
123	dma_free_coherent(pcm->card->dev, buf->bytes,
124	buf->area, buf->addr);
125	buf->area = NULL;
126	}
127	}
128
92dfa619 BS	129	/--------------------------------------------------------------------------\
	130	* Hardware definition
	131	\--------------------------------------------------------------------------/
	132	/* TODO: These values were taken from the AT91 platform driver, check
	133	* them against real values for AT32
	134	*/
	135	static const struct snd_pcm_hardware atmel_pcm_hardware = {
	136	.info = SNDRV_PCM_INFO_MMAP \|
	137	SNDRV_PCM_INFO_MMAP_VALID \|
	138	SNDRV_PCM_INFO_INTERLEAVED \|
	139	SNDRV_PCM_INFO_PAUSE,
92dfa619 BS	140	.period_bytes_min = 32,
	141	.period_bytes_max = 8192,
	142	.periods_min = 2,
	143	.periods_max = 1024,
	144	.buffer_bytes_max = ATMEL_SSC_DMABUF_SIZE,
	145	};
	146
	147
	148	/--------------------------------------------------------------------------\
	149	* Data types
	150	\--------------------------------------------------------------------------/
	151	struct atmel_runtime_data {
	152	struct atmel_pcm_dma_params *params;
	153	dma_addr_t dma_buffer; /* physical address of dma buffer */
	154	dma_addr_t dma_buffer_end; /* first address beyond DMA buffer */
	155	size_t period_size;
	156
	157	dma_addr_t period_ptr; /* physical address of next period */
92dfa619 BS	158	};
	159
	160	/--------------------------------------------------------------------------\
	161	* ISR
	162	\--------------------------------------------------------------------------/
	163	static void atmel_pcm_dma_irq(u32 ssc_sr,
	164	struct snd_pcm_substream *substream)
	165	{
	166	struct atmel_runtime_data *prtd = substream->runtime->private_data;
	167	struct atmel_pcm_dma_params *params = prtd->params;
	168	static int count;
	169
	170	count++;
	171
	172	if (ssc_sr & params->mask->ssc_endbuf) {
	173	pr_warn("atmel-pcm: buffer %s on %s (SSC_SR=%#x, count=%d)\n",
	174	substream->stream == SNDRV_PCM_STREAM_PLAYBACK
	175	? "underrun" : "overrun",
	176	params->name, ssc_sr, count);
	177
	178	/* re-start the PDC */
	179	ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
	180	params->mask->pdc_disable);
	181	prtd->period_ptr += prtd->period_size;
	182	if (prtd->period_ptr >= prtd->dma_buffer_end)
	183	prtd->period_ptr = prtd->dma_buffer;
	184
	185	ssc_writex(params->ssc->regs, params->pdc->xpr,
	186	prtd->period_ptr);
	187	ssc_writex(params->ssc->regs, params->pdc->xcr,
	188	prtd->period_size / params->pdc_xfer_size);
	189	ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
	190	params->mask->pdc_enable);
	191	}
	192
	193	if (ssc_sr & params->mask->ssc_endx) {
	194	/* Load the PDC next pointer and counter registers */
	195	prtd->period_ptr += prtd->period_size;
	196	if (prtd->period_ptr >= prtd->dma_buffer_end)
	197	prtd->period_ptr = prtd->dma_buffer;
	198
	199	ssc_writex(params->ssc->regs, params->pdc->xnpr,
	200	prtd->period_ptr);
	201	ssc_writex(params->ssc->regs, params->pdc->xncr,
	202	prtd->period_size / params->pdc_xfer_size);
	203	}
	204
	205	snd_pcm_period_elapsed(substream);
	206	}
	207
	208
	209	/--------------------------------------------------------------------------\
	210	* PCM operations
	211	\--------------------------------------------------------------------------/
	212	static int atmel_pcm_hw_params(struct snd_pcm_substream *substream,
	213	struct snd_pcm_hw_params *params)
	214	{
	215	struct snd_pcm_runtime *runtime = substream->runtime;
	216	struct atmel_runtime_data *prtd = runtime->private_data;
	217	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	218
	219	/* this may get called several times by oss emulation
	220	* with different params */
	221
222	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
223	runtime->dma_bytes = params_buffer_bytes(params);
224
225	prtd->params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
226	prtd->params->dma_intr_handler = atmel_pcm_dma_irq;
227
228	prtd->dma_buffer = runtime->dma_addr;
229	prtd->dma_buffer_end = runtime->dma_addr + runtime->dma_bytes;
230	prtd->period_size = params_period_bytes(params);
231
232	pr_debug("atmel-pcm: "
233	"hw_params: DMA for %s initialized "
153f5a18	234	"(dma_bytes=%zu, period_size=%zu)\n",
92dfa619 BS	235	prtd->params->name,
	236	runtime->dma_bytes,
	237	prtd->period_size);
	238	return 0;
	239	}
	240
	241	static int atmel_pcm_hw_free(struct snd_pcm_substream *substream)
	242	{
	243	struct atmel_runtime_data *prtd = substream->runtime->private_data;
	244	struct atmel_pcm_dma_params *params = prtd->params;
	245
	246	if (params != NULL) {
	247	ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
	248	params->mask->pdc_disable);
	249	prtd->params->dma_intr_handler = NULL;
	250	}
	251
	252	return 0;
	253	}
	254
	255	static int atmel_pcm_prepare(struct snd_pcm_substream *substream)
	256	{
	257	struct atmel_runtime_data *prtd = substream->runtime->private_data;
	258	struct atmel_pcm_dma_params *params = prtd->params;
	259
	260	ssc_writex(params->ssc->regs, SSC_IDR,
	261	params->mask->ssc_endx \| params->mask->ssc_endbuf);
	262	ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
	263	params->mask->pdc_disable);
	264	return 0;
	265	}
	266
	267	static int atmel_pcm_trigger(struct snd_pcm_substream *substream,
	268	int cmd)
	269	{
	270	struct snd_pcm_runtime *rtd = substream->runtime;
	271	struct atmel_runtime_data *prtd = rtd->private_data;
	272	struct atmel_pcm_dma_params *params = prtd->params;
	273	int ret = 0;
	274
	275	pr_debug("atmel-pcm:buffer_size = %ld,"
153f5a18	276	"dma_area = %p, dma_bytes = %zu\n",
92dfa619 BS	277	rtd->buffer_size, rtd->dma_area, rtd->dma_bytes);
	278
	279	switch (cmd) {
	280	case SNDRV_PCM_TRIGGER_START:
	281	prtd->period_ptr = prtd->dma_buffer;
	282
	283	ssc_writex(params->ssc->regs, params->pdc->xpr,
	284	prtd->period_ptr);
	285	ssc_writex(params->ssc->regs, params->pdc->xcr,
	286	prtd->period_size / params->pdc_xfer_size);
	287
	288	prtd->period_ptr += prtd->period_size;
	289	ssc_writex(params->ssc->regs, params->pdc->xnpr,
	290	prtd->period_ptr);
	291	ssc_writex(params->ssc->regs, params->pdc->xncr,
	292	prtd->period_size / params->pdc_xfer_size);
	293
	294	pr_debug("atmel-pcm: trigger: "
	295	"period_ptr=%lx, xpr=%u, "
	296	"xcr=%u, xnpr=%u, xncr=%u\n",
	297	(unsigned long)prtd->period_ptr,
	298	ssc_readx(params->ssc->regs, params->pdc->xpr),
	299	ssc_readx(params->ssc->regs, params->pdc->xcr),
	300	ssc_readx(params->ssc->regs, params->pdc->xnpr),
	301	ssc_readx(params->ssc->regs, params->pdc->xncr));
	302
	303	ssc_writex(params->ssc->regs, SSC_IER,
	304	params->mask->ssc_endx \| params->mask->ssc_endbuf);
	305	ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
	306	params->mask->pdc_enable);
	307
	308	pr_debug("sr=%u imr=%u\n",
	309	ssc_readx(params->ssc->regs, SSC_SR),
	310	ssc_readx(params->ssc->regs, SSC_IER));
	311	break; /* SNDRV_PCM_TRIGGER_START */
	312
	313	case SNDRV_PCM_TRIGGER_STOP:
	314	case SNDRV_PCM_TRIGGER_SUSPEND:
	315	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	316	ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
	317	params->mask->pdc_disable);
	318	break;
	319
	320	case SNDRV_PCM_TRIGGER_RESUME:
	321	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	322	ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
	323	params->mask->pdc_enable);
	324	break;
	325
	326	default:
	327	ret = -EINVAL;
	328	}
	329
	330	return ret;
	331	}
	332
	333	static snd_pcm_uframes_t atmel_pcm_pointer(
	334	struct snd_pcm_substream *substream)
	335	{
	336	struct snd_pcm_runtime *runtime = substream->runtime;
	337	struct atmel_runtime_data *prtd = runtime->private_data;
	338	struct atmel_pcm_dma_params *params = prtd->params;
	339	dma_addr_t ptr;
	340	snd_pcm_uframes_t x;
341
342	ptr = (dma_addr_t) ssc_readx(params->ssc->regs, params->pdc->xpr);
343	x = bytes_to_frames(runtime, ptr - prtd->dma_buffer);
344
345	if (x == runtime->buffer_size)
346	x = 0;
347
348	return x;
349	}
350
351	static int atmel_pcm_open(struct snd_pcm_substream *substream)
352	{
353	struct snd_pcm_runtime *runtime = substream->runtime;
354	struct atmel_runtime_data *prtd;
355	int ret = 0;
356
357	snd_soc_set_runtime_hwparams(substream, &atmel_pcm_hardware);
358
359	/* ensure that buffer size is a multiple of period size */
360	ret = snd_pcm_hw_constraint_integer(runtime,
361	SNDRV_PCM_HW_PARAM_PERIODS);
362	if (ret < 0)
363	goto out;
364
365	prtd = kzalloc(sizeof(struct atmel_runtime_data), GFP_KERNEL);
366	if (prtd == NULL) {
367	ret = -ENOMEM;
368	goto out;
369	}
370	runtime->private_data = prtd;
371
372	out:
373	return ret;
374	}
375
376	static int atmel_pcm_close(struct snd_pcm_substream *substream)
377	{
378	struct atmel_runtime_data *prtd = substream->runtime->private_data;
379
380	kfree(prtd);
381	return 0;
382	}
383
115c7254	384	static const struct snd_pcm_ops atmel_pcm_ops = {
92dfa619 BS	385	.open = atmel_pcm_open,
	386	.close = atmel_pcm_close,
	387	.ioctl = snd_pcm_lib_ioctl,
	388	.hw_params = atmel_pcm_hw_params,
	389	.hw_free = atmel_pcm_hw_free,
	390	.prepare = atmel_pcm_prepare,
	391	.trigger = atmel_pcm_trigger,
	392	.pointer = atmel_pcm_pointer,
	393	.mmap = atmel_pcm_mmap,
	394	};
	395
92dfa619 BS	396	static struct snd_soc_platform_driver atmel_soc_platform = {
	397	.ops = &atmel_pcm_ops,
	398	.pcm_new = atmel_pcm_new,
	399	.pcm_free = atmel_pcm_free,
92dfa619 BS	400	};
	401
	402	int atmel_pcm_pdc_platform_register(struct device *dev)
	403	{
	404	return snd_soc_register_platform(dev, &atmel_soc_platform);
	405	}
	406	EXPORT_SYMBOL(atmel_pcm_pdc_platform_register);
	407
	408	void atmel_pcm_pdc_platform_unregister(struct device *dev)
	409	{
	410	snd_soc_unregister_platform(dev);
	411	}
	412	EXPORT_SYMBOL(atmel_pcm_pdc_platform_unregister);
	413
	414	MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
	415	MODULE_DESCRIPTION("Atmel PCM module");
	416	MODULE_LICENSE("GPL");