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


/*--------------------------------------------------------------------------*\
 * 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,
	.formats		= SNDRV_PCM_FMTBIT_S16_LE,
	.period_bytes_min	= 32,
	.period_bytes_max	= 8192,
	.periods_min		= 2,
	.periods_max		= 1024,
	.buffer_bytes_max	= 32 * 1024,
};


/*--------------------------------------------------------------------------*\
 * 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 */

	/* PDC register save */
	u32 pdc_xpr_save;
	u32 pdc_xcr_save;
	u32 pdc_xnpr_save;
	u32 pdc_xncr_save;
};


/*--------------------------------------------------------------------------*\
 * Helper functions
\*--------------------------------------------------------------------------*/
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_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_coherent(pcm->card->dev, size,
					  &buf->addr, GFP_KERNEL);
	pr_debug("atmel-pcm:"
		"preallocate_dma_buffer: area=%p, addr=%p, size=%d\n",
		(void *) buf->area,
		(void *) buf->addr,
		size);

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

	buf->bytes = size;
	return 0;
}
/*--------------------------------------------------------------------------*\
 * 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_warning("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=%u, period_size=%u)\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 = %u\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 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 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,
};


/*--------------------------------------------------------------------------*\
 * ASoC platform driver
\*--------------------------------------------------------------------------*/
static u64 atmel_pcm_dmamask = 0xffffffff;

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 = 0;

	if (!card->dev->dma_mask)
		card->dev->dma_mask = &atmel_pcm_dmamask;
	if (!card->dev->coherent_dma_mask)
		card->dev->coherent_dma_mask = 0xffffffff;

	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
		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_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_coherent(pcm->card->dev, buf->bytes,
				  buf->area, buf->addr);
		buf->area = NULL;
	}
}

#ifdef CONFIG_PM
static int atmel_pcm_suspend(struct snd_soc_dai *dai)
{
	struct snd_pcm_runtime *runtime = dai->runtime;
	struct atmel_runtime_data *prtd;
	struct atmel_pcm_dma_params *params;

	if (!runtime)
		return 0;

	prtd = runtime->private_data;
	params = prtd->params;

	/* disable the PDC and save the PDC registers */

	ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_disable);

	prtd->pdc_xpr_save = ssc_readx(params->ssc->regs, params->pdc->xpr);
	prtd->pdc_xcr_save = ssc_readx(params->ssc->regs, params->pdc->xcr);
	prtd->pdc_xnpr_save = ssc_readx(params->ssc->regs, params->pdc->xnpr);
	prtd->pdc_xncr_save = ssc_readx(params->ssc->regs, params->pdc->xncr);

	return 0;
}

static int atmel_pcm_resume(struct snd_soc_dai *dai)
{
	struct snd_pcm_runtime *runtime = dai->runtime;
	struct atmel_runtime_data *prtd;
	struct atmel_pcm_dma_params *params;

	if (!runtime)
		return 0;

	prtd = runtime->private_data;
	params = prtd->params;

	/* restore the PDC registers and enable the PDC */
	ssc_writex(params->ssc->regs, params->pdc->xpr, prtd->pdc_xpr_save);
	ssc_writex(params->ssc->regs, params->pdc->xcr, prtd->pdc_xcr_save);
	ssc_writex(params->ssc->regs, params->pdc->xnpr, prtd->pdc_xnpr_save);
	ssc_writex(params->ssc->regs, params->pdc->xncr, prtd->pdc_xncr_save);

	ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_enable);
	return 0;
}
#else
#define atmel_pcm_suspend	NULL
#define atmel_pcm_resume	NULL
#endif

static struct snd_soc_platform_driver atmel_soc_platform = {
	.ops		= &atmel_pcm_ops,
	.pcm_new	= atmel_pcm_new,
	.pcm_free	= atmel_pcm_free_dma_buffers,
	.suspend	= atmel_pcm_suspend,
	.resume		= atmel_pcm_resume,
};

static int __devinit atmel_soc_platform_probe(struct platform_device *pdev)
{
	return snd_soc_register_platform(&pdev->dev, &atmel_soc_platform);
}

static int __devexit atmel_soc_platform_remove(struct platform_device *pdev)
{
	snd_soc_unregister_platform(&pdev->dev);
	return 0;
}

static struct platform_driver atmel_pcm_driver = {
	.driver = {
			.name = "atmel-pcm-audio",
			.owner = THIS_MODULE,
	},

	.probe = atmel_soc_platform_probe,
	.remove = __devexit_p(atmel_soc_platform_remove),
};

module_platform_driver(atmel_pcm_driver);

MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
MODULE_DESCRIPTION("Atmel PCM module");
MODULE_LICENSE("GPL");
Commit	Line	Data
6c742509 SG	1	/*
6c742509 SG	2	* atmel-pcm.c -- ALSA PCM interface for the Atmel atmel SoC.
9aaca968	3	*
6c742509 SG	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.
9aaca968 GW	18	*
9aaca968 GW	19	* This program is free software; you can redistribute it and/or modify
6c742509 SG	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.
9aaca968	23	*
6c742509 SG	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
9aaca968 GW	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>
6c742509	40	#include <linux/atmel-ssc.h>
9aaca968 GW	41
	42	#include <sound/core.h>
	43	#include <sound/pcm.h>
	44	#include <sound/pcm_params.h>
	45	#include <sound/soc.h>
	46
6c742509	47	#include "atmel-pcm.h"
9aaca968 GW	48
	49
	50	/--------------------------------------------------------------------------\
	51	* Hardware definition
	52	\--------------------------------------------------------------------------/
	53	/* TODO: These values were taken from the AT91 platform driver, check
	54	* them against real values for AT32
	55	*/
6c742509 SG	56	static const struct snd_pcm_hardware atmel_pcm_hardware = {
	57	.info = SNDRV_PCM_INFO_MMAP \|
	58	SNDRV_PCM_INFO_MMAP_VALID \|
	59	SNDRV_PCM_INFO_INTERLEAVED \|
	60	SNDRV_PCM_INFO_PAUSE,
	61	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	62	.period_bytes_min = 32,
	63	.period_bytes_max = 8192,
	64	.periods_min = 2,
	65	.periods_max = 1024,
	66	.buffer_bytes_max = 32 * 1024,
9aaca968 GW	67	};
	68
	69
9aaca968 GW	70	/--------------------------------------------------------------------------\
	71	* Data types
	72	\--------------------------------------------------------------------------/
6c742509 SG	73	struct atmel_runtime_data {
	74	struct atmel_pcm_dma_params *params;
	75	dma_addr_t dma_buffer; /* physical address of dma buffer */
	76	dma_addr_t dma_buffer_end; /* first address beyond DMA buffer */
9aaca968 GW	77	size_t period_size;
9aaca968 GW	78
6c742509	79	dma_addr_t period_ptr; /* physical address of next period */
9aaca968	80
6c742509	81	/* PDC register save */
9aaca968 GW	82	u32 pdc_xpr_save;
	83	u32 pdc_xcr_save;
	84	u32 pdc_xnpr_save;
	85	u32 pdc_xncr_save;
	86	};
	87
	88
9aaca968 GW	89	/--------------------------------------------------------------------------\
	90	* Helper functions
	91	\--------------------------------------------------------------------------/
6c742509 SG	92	static int atmel_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
6c742509 SG	93	int stream)
9aaca968 GW	94	{
9aaca968 GW	95	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
6c742509 SG	96	struct snd_dma_buffer *buf = &substream->dma_buffer;
	97	size_t size = atmel_pcm_hardware.buffer_bytes_max;
	98
	99	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	100	buf->dev.dev = pcm->card->dev;
	101	buf->private_data = NULL;
	102	buf->area = dma_alloc_coherent(pcm->card->dev, size,
	103	&buf->addr, GFP_KERNEL);
	104	pr_debug("atmel-pcm:"
	105	"preallocate_dma_buffer: area=%p, addr=%p, size=%d\n",
	106	(void *) buf->area,
	107	(void *) buf->addr,
	108	size);
	109
	110	if (!buf->area)
9aaca968 GW	111	return -ENOMEM;
9aaca968 GW	112
6c742509	113	buf->bytes = size;
9aaca968 GW	114	return 0;
9aaca968 GW	115	}
9aaca968 GW	116	/--------------------------------------------------------------------------\
	117	* ISR
	118	\--------------------------------------------------------------------------/
6c742509 SG	119	static void atmel_pcm_dma_irq(u32 ssc_sr,
6c742509 SG	120	struct snd_pcm_substream *substream)
9aaca968	121	{
6c742509 SG	122	struct atmel_runtime_data *prtd = substream->runtime->private_data;
6c742509 SG	123	struct atmel_pcm_dma_params *params = prtd->params;
9aaca968 GW	124	static int count;
	125
	126	count++;
6c742509	127
9aaca968	128	if (ssc_sr & params->mask->ssc_endbuf) {
6c742509 SG	129	pr_warning("atmel-pcm: buffer %s on %s"
	130	" (SSC_SR=%#x, count=%d)\n",
	131	substream->stream == SNDRV_PCM_STREAM_PLAYBACK
	132	? "underrun" : "overrun",
	133	params->name, ssc_sr, count);
9aaca968 GW	134
	135	/* re-start the PDC */
	136	ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
	137	params->mask->pdc_disable);
	138	prtd->period_ptr += prtd->period_size;
	139	if (prtd->period_ptr >= prtd->dma_buffer_end)
	140	prtd->period_ptr = prtd->dma_buffer;
	141
9aaca968 GW	142	ssc_writex(params->ssc->regs, params->pdc->xpr,
	143	prtd->period_ptr);
	144	ssc_writex(params->ssc->regs, params->pdc->xcr,
	145	prtd->period_size / params->pdc_xfer_size);
	146	ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
	147	params->mask->pdc_enable);
	148	}
	149
9aaca968 GW	150	if (ssc_sr & params->mask->ssc_endx) {
	151	/* Load the PDC next pointer and counter registers */
	152	prtd->period_ptr += prtd->period_size;
	153	if (prtd->period_ptr >= prtd->dma_buffer_end)
	154	prtd->period_ptr = prtd->dma_buffer;
6c742509	155
9aaca968 GW	156	ssc_writex(params->ssc->regs, params->pdc->xnpr,
	157	prtd->period_ptr);
	158	ssc_writex(params->ssc->regs, params->pdc->xncr,
	159	prtd->period_size / params->pdc_xfer_size);
	160	}
	161
9aaca968 GW	162	snd_pcm_period_elapsed(substream);
	163	}
	164
	165
9aaca968 GW	166	/--------------------------------------------------------------------------\
	167	* PCM operations
	168	\--------------------------------------------------------------------------/
6c742509 SG	169	static int atmel_pcm_hw_params(struct snd_pcm_substream *substream,
6c742509 SG	170	struct snd_pcm_hw_params *params)
9aaca968 GW	171	{
9aaca968 GW	172	struct snd_pcm_runtime *runtime = substream->runtime;
6c742509	173	struct atmel_runtime_data *prtd = runtime->private_data;
9aaca968 GW	174	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	175
	176	/* this may get called several times by oss emulation
6c742509 SG	177	* with different params */
6c742509 SG	178
9aaca968 GW	179	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	180	runtime->dma_bytes = params_buffer_bytes(params);
	181
f0fba2ad	182	prtd->params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
6c742509	183	prtd->params->dma_intr_handler = atmel_pcm_dma_irq;
9aaca968 GW	184
	185	prtd->dma_buffer = runtime->dma_addr;
	186	prtd->dma_buffer_end = runtime->dma_addr + runtime->dma_bytes;
	187	prtd->period_size = params_period_bytes(params);
	188
6c742509 SG	189	pr_debug("atmel-pcm: "
	190	"hw_params: DMA for %s initialized "
	191	"(dma_bytes=%u, period_size=%u)\n",
	192	prtd->params->name,
	193	runtime->dma_bytes,
	194	prtd->period_size);
9aaca968 GW	195	return 0;
	196	}
	197
6c742509	198	static int atmel_pcm_hw_free(struct snd_pcm_substream *substream)
9aaca968	199	{
6c742509 SG	200	struct atmel_runtime_data *prtd = substream->runtime->private_data;
6c742509 SG	201	struct atmel_pcm_dma_params *params = prtd->params;
9aaca968 GW	202
	203	if (params != NULL) {
	204	ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
	205	params->mask->pdc_disable);
	206	prtd->params->dma_intr_handler = NULL;
	207	}
	208
	209	return 0;
	210	}
	211
6c742509	212	static int atmel_pcm_prepare(struct snd_pcm_substream *substream)
9aaca968	213	{
6c742509 SG	214	struct atmel_runtime_data *prtd = substream->runtime->private_data;
6c742509 SG	215	struct atmel_pcm_dma_params *params = prtd->params;
9aaca968 GW	216
	217	ssc_writex(params->ssc->regs, SSC_IDR,
	218	params->mask->ssc_endx \| params->mask->ssc_endbuf);
	219	ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
	220	params->mask->pdc_disable);
9aaca968 GW	221	return 0;
	222	}
	223
6c742509 SG	224	static int atmel_pcm_trigger(struct snd_pcm_substream *substream,
6c742509 SG	225	int cmd)
9aaca968 GW	226	{
9aaca968 GW	227	struct snd_pcm_runtime *rtd = substream->runtime;
6c742509 SG	228	struct atmel_runtime_data *prtd = rtd->private_data;
6c742509 SG	229	struct atmel_pcm_dma_params *params = prtd->params;
9aaca968 GW	230	int ret = 0;
9aaca968 GW	231
6c742509 SG	232	pr_debug("atmel-pcm:buffer_size = %ld,"
	233	"dma_area = %p, dma_bytes = %u\n",
	234	rtd->buffer_size, rtd->dma_area, rtd->dma_bytes);
9aaca968 GW	235
	236	switch (cmd) {
	237	case SNDRV_PCM_TRIGGER_START:
	238	prtd->period_ptr = prtd->dma_buffer;
	239
	240	ssc_writex(params->ssc->regs, params->pdc->xpr,
	241	prtd->period_ptr);
	242	ssc_writex(params->ssc->regs, params->pdc->xcr,
	243	prtd->period_size / params->pdc_xfer_size);
	244
	245	prtd->period_ptr += prtd->period_size;
	246	ssc_writex(params->ssc->regs, params->pdc->xnpr,
	247	prtd->period_ptr);
	248	ssc_writex(params->ssc->regs, params->pdc->xncr,
	249	prtd->period_size / params->pdc_xfer_size);
	250
6c742509 SG	251	pr_debug("atmel-pcm: trigger: "
	252	"period_ptr=%lx, xpr=%u, "
	253	"xcr=%u, xnpr=%u, xncr=%u\n",
	254	(unsigned long)prtd->period_ptr,
	255	ssc_readx(params->ssc->regs, params->pdc->xpr),
	256	ssc_readx(params->ssc->regs, params->pdc->xcr),
	257	ssc_readx(params->ssc->regs, params->pdc->xnpr),
	258	ssc_readx(params->ssc->regs, params->pdc->xncr));
9aaca968 GW	259
	260	ssc_writex(params->ssc->regs, SSC_IER,
	261	params->mask->ssc_endx \| params->mask->ssc_endbuf);
	262	ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
	263	params->mask->pdc_enable);
	264
6c742509 SG	265	pr_debug("sr=%u imr=%u\n",
	266	ssc_readx(params->ssc->regs, SSC_SR),
	267	ssc_readx(params->ssc->regs, SSC_IER));
9aaca968 GW	268	break; /* SNDRV_PCM_TRIGGER_START */
9aaca968 GW	269
9aaca968 GW	270	case SNDRV_PCM_TRIGGER_STOP:
	271	case SNDRV_PCM_TRIGGER_SUSPEND:
	272	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	273	ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
	274	params->mask->pdc_disable);
	275	break;
	276
9aaca968 GW	277	case SNDRV_PCM_TRIGGER_RESUME:
	278	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	279	ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
	280	params->mask->pdc_enable);
	281	break;
	282
	283	default:
	284	ret = -EINVAL;
	285	}
	286
	287	return ret;
	288	}
	289
6c742509 SG	290	static snd_pcm_uframes_t atmel_pcm_pointer(
6c742509 SG	291	struct snd_pcm_substream *substream)
9aaca968 GW	292	{
9aaca968 GW	293	struct snd_pcm_runtime *runtime = substream->runtime;
6c742509 SG	294	struct atmel_runtime_data *prtd = runtime->private_data;
6c742509 SG	295	struct atmel_pcm_dma_params *params = prtd->params;
9aaca968 GW	296	dma_addr_t ptr;
	297	snd_pcm_uframes_t x;
	298
	299	ptr = (dma_addr_t) ssc_readx(params->ssc->regs, params->pdc->xpr);
	300	x = bytes_to_frames(runtime, ptr - prtd->dma_buffer);
	301
	302	if (x == runtime->buffer_size)
	303	x = 0;
	304
	305	return x;
	306	}
	307
6c742509	308	static int atmel_pcm_open(struct snd_pcm_substream *substream)
9aaca968 GW	309	{
9aaca968 GW	310	struct snd_pcm_runtime *runtime = substream->runtime;
6c742509	311	struct atmel_runtime_data *prtd;
9aaca968 GW	312	int ret = 0;
9aaca968 GW	313
6c742509	314	snd_soc_set_runtime_hwparams(substream, &atmel_pcm_hardware);
9aaca968 GW	315
	316	/* ensure that buffer size is a multiple of period size */
	317	ret = snd_pcm_hw_constraint_integer(runtime,
6c742509	318	SNDRV_PCM_HW_PARAM_PERIODS);
9aaca968 GW	319	if (ret < 0)
	320	goto out;
	321
6c742509	322	prtd = kzalloc(sizeof(struct atmel_runtime_data), GFP_KERNEL);
9aaca968 GW	323	if (prtd == NULL) {
	324	ret = -ENOMEM;
	325	goto out;
	326	}
	327	runtime->private_data = prtd;
	328
6c742509	329	out:
9aaca968 GW	330	return ret;
	331	}
	332
6c742509	333	static int atmel_pcm_close(struct snd_pcm_substream *substream)
9aaca968	334	{
6c742509	335	struct atmel_runtime_data *prtd = substream->runtime->private_data;
9aaca968 GW	336
	337	kfree(prtd);
	338	return 0;
	339	}
	340
6c742509 SG	341	static int atmel_pcm_mmap(struct snd_pcm_substream *substream,
6c742509 SG	342	struct vm_area_struct *vma)
9aaca968 GW	343	{
9aaca968 GW	344	return remap_pfn_range(vma, vma->vm_start,
6c742509 SG	345	substream->dma_buffer.addr >> PAGE_SHIFT,
6c742509 SG	346	vma->vm_end - vma->vm_start, vma->vm_page_prot);
9aaca968 GW	347	}
9aaca968 GW	348
b2a19d02	349	static struct snd_pcm_ops atmel_pcm_ops = {
6c742509 SG	350	.open = atmel_pcm_open,
	351	.close = atmel_pcm_close,
	352	.ioctl = snd_pcm_lib_ioctl,
	353	.hw_params = atmel_pcm_hw_params,
	354	.hw_free = atmel_pcm_hw_free,
	355	.prepare = atmel_pcm_prepare,
	356	.trigger = atmel_pcm_trigger,
	357	.pointer = atmel_pcm_pointer,
	358	.mmap = atmel_pcm_mmap,
9aaca968 GW	359	};
	360
	361
9aaca968 GW	362	/--------------------------------------------------------------------------\
	363	* ASoC platform driver
	364	\--------------------------------------------------------------------------/
6c742509	365	static u64 atmel_pcm_dmamask = 0xffffffff;
9aaca968	366
552d1ef6	367	static int atmel_pcm_new(struct snd_soc_pcm_runtime *rtd)
9aaca968	368	{
552d1ef6	369	struct snd_card *card = rtd->card->snd_card;
552d1ef6	370	struct snd_pcm *pcm = rtd->pcm;
9aaca968 GW	371	int ret = 0;
	372
	373	if (!card->dev->dma_mask)
6c742509	374	card->dev->dma_mask = &atmel_pcm_dmamask;
9aaca968 GW	375	if (!card->dev->coherent_dma_mask)
	376	card->dev->coherent_dma_mask = 0xffffffff;
	377
25e9e756	378	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
6c742509 SG	379	ret = atmel_pcm_preallocate_dma_buffer(pcm,
6c742509 SG	380	SNDRV_PCM_STREAM_PLAYBACK);
9aaca968 GW	381	if (ret)
	382	goto out;
	383	}
	384
25e9e756	385	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
7309d2e2	386	pr_debug("atmel-pcm:"
6c742509 SG	387	"Allocating PCM capture DMA buffer\n");
	388	ret = atmel_pcm_preallocate_dma_buffer(pcm,
	389	SNDRV_PCM_STREAM_CAPTURE);
9aaca968 GW	390	if (ret)
	391	goto out;
	392	}
6c742509	393	out:
9aaca968 GW	394	return ret;
	395	}
	396
6c742509	397	static void atmel_pcm_free_dma_buffers(struct snd_pcm *pcm)
9aaca968 GW	398	{
	399	struct snd_pcm_substream *substream;
	400	struct snd_dma_buffer *buf;
	401	int stream;
	402
	403	for (stream = 0; stream < 2; stream++) {
	404	substream = pcm->streams[stream].substream;
6c742509	405	if (!substream)
9aaca968 GW	406	continue;
	407
	408	buf = &substream->dma_buffer;
	409	if (!buf->area)
	410	continue;
	411	dma_free_coherent(pcm->card->dev, buf->bytes,
	412	buf->area, buf->addr);
	413	buf->area = NULL;
	414	}
	415	}
	416
9aaca968	417	#ifdef CONFIG_PM
f0fba2ad	418	static int atmel_pcm_suspend(struct snd_soc_dai *dai)
9aaca968	419	{
f0fba2ad	420	struct snd_pcm_runtime *runtime = dai->runtime;
6c742509 SG	421	struct atmel_runtime_data *prtd;
6c742509 SG	422	struct atmel_pcm_dma_params *params;
9aaca968	423
6c742509	424	if (!runtime)
9aaca968	425	return 0;
6c742509	426
9aaca968 GW	427	prtd = runtime->private_data;
	428	params = prtd->params;
	429
6c742509 SG	430	/* disable the PDC and save the PDC registers */
	431
	432	ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_disable);
9aaca968 GW	433
	434	prtd->pdc_xpr_save = ssc_readx(params->ssc->regs, params->pdc->xpr);
	435	prtd->pdc_xcr_save = ssc_readx(params->ssc->regs, params->pdc->xcr);
	436	prtd->pdc_xnpr_save = ssc_readx(params->ssc->regs, params->pdc->xnpr);
	437	prtd->pdc_xncr_save = ssc_readx(params->ssc->regs, params->pdc->xncr);
	438
	439	return 0;
	440	}
	441
f0fba2ad	442	static int atmel_pcm_resume(struct snd_soc_dai *dai)
9aaca968	443	{
f0fba2ad	444	struct snd_pcm_runtime *runtime = dai->runtime;
6c742509 SG	445	struct atmel_runtime_data *prtd;
6c742509 SG	446	struct atmel_pcm_dma_params *params;
9aaca968	447
6c742509	448	if (!runtime)
9aaca968	449	return 0;
6c742509	450
9aaca968 GW	451	prtd = runtime->private_data;
	452	params = prtd->params;
	453
6c742509	454	/* restore the PDC registers and enable the PDC */
9aaca968 GW	455	ssc_writex(params->ssc->regs, params->pdc->xpr, prtd->pdc_xpr_save);
	456	ssc_writex(params->ssc->regs, params->pdc->xcr, prtd->pdc_xcr_save);
	457	ssc_writex(params->ssc->regs, params->pdc->xnpr, prtd->pdc_xnpr_save);
	458	ssc_writex(params->ssc->regs, params->pdc->xncr, prtd->pdc_xncr_save);
	459
6c742509	460	ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_enable);
9aaca968 GW	461	return 0;
9aaca968 GW	462	}
6c742509 SG	463	#else
	464	#define atmel_pcm_suspend NULL
	465	#define atmel_pcm_resume NULL
	466	#endif
	467
f0fba2ad LG	468	static struct snd_soc_platform_driver atmel_soc_platform = {
f0fba2ad LG	469	.ops = &atmel_pcm_ops,
6c742509 SG	470	.pcm_new = atmel_pcm_new,
	471	.pcm_free = atmel_pcm_free_dma_buffers,
	472	.suspend = atmel_pcm_suspend,
	473	.resume = atmel_pcm_resume,
9aaca968	474	};
9aaca968	475
f0fba2ad LG	476	static int __devinit atmel_soc_platform_probe(struct platform_device *pdev)
	477	{
	478	return snd_soc_register_platform(&pdev->dev, &atmel_soc_platform);
	479	}
	480
	481	static int __devexit atmel_soc_platform_remove(struct platform_device *pdev)
	482	{
	483	snd_soc_unregister_platform(&pdev->dev);
	484	return 0;
	485	}
	486
	487	static struct platform_driver atmel_pcm_driver = {
	488	.driver = {
	489	.name = "atmel-pcm-audio",
	490	.owner = THIS_MODULE,
	491	},
	492
	493	.probe = atmel_soc_platform_probe,
	494	.remove = __devexit_p(atmel_soc_platform_remove),
	495	};
	496
b31c9056	497	module_platform_driver(atmel_pcm_driver);
958e792c	498
6c742509 SG	499	MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
6c742509 SG	500	MODULE_DESCRIPTION("Atmel PCM module");
9aaca968	501	MODULE_LICENSE("GPL");