[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 <mach/hardware.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 */
	int periods;			/* period index of period_ptr */

	/* 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 = rtd->dai->cpu_dai->dma_data;
	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);
}

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_card *card,
	struct snd_soc_dai *dai, struct snd_pcm *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 (dai->playback.channels_min) {
		ret = atmel_pcm_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_PLAYBACK);
		if (ret)
			goto out;
	}

	if (dai->capture.channels_min) {
		pr_debug("at32-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

struct snd_soc_platform atmel_soc_platform = {
	.name		= "atmel-audio",
	.pcm_ops 	= &atmel_pcm_ops,
	.pcm_new	= atmel_pcm_new,
	.pcm_free	= atmel_pcm_free_dma_buffers,
	.suspend	= atmel_pcm_suspend,
	.resume		= atmel_pcm_resume,
};
EXPORT_SYMBOL_GPL(atmel_soc_platform);

static int __init atmel_pcm_modinit(void)
{
	return snd_soc_register_platform(&atmel_soc_platform);
}
module_init(atmel_pcm_modinit);

static void __exit atmel_pcm_modexit(void)
{
	snd_soc_unregister_platform(&atmel_soc_platform);
}
module_exit(atmel_pcm_modexit);

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 <mach/hardware.h>
9aaca968	48
6c742509	49	#include "atmel-pcm.h"
9aaca968 GW	50
	51
	52	/--------------------------------------------------------------------------\
	53	* Hardware definition
	54	\--------------------------------------------------------------------------/
	55	/* TODO: These values were taken from the AT91 platform driver, check
	56	* them against real values for AT32
	57	*/
6c742509 SG	58	static const struct snd_pcm_hardware atmel_pcm_hardware = {
	59	.info = SNDRV_PCM_INFO_MMAP \|
	60	SNDRV_PCM_INFO_MMAP_VALID \|
	61	SNDRV_PCM_INFO_INTERLEAVED \|
	62	SNDRV_PCM_INFO_PAUSE,
	63	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	64	.period_bytes_min = 32,
	65	.period_bytes_max = 8192,
	66	.periods_min = 2,
	67	.periods_max = 1024,
	68	.buffer_bytes_max = 32 * 1024,
9aaca968 GW	69	};
	70
	71
9aaca968 GW	72	/--------------------------------------------------------------------------\
	73	* Data types
	74	\--------------------------------------------------------------------------/
6c742509 SG	75	struct atmel_runtime_data {
	76	struct atmel_pcm_dma_params *params;
	77	dma_addr_t dma_buffer; /* physical address of dma buffer */
	78	dma_addr_t dma_buffer_end; /* first address beyond DMA buffer */
9aaca968 GW	79	size_t period_size;
9aaca968 GW	80
6c742509 SG	81	dma_addr_t period_ptr; /* physical address of next period */
6c742509 SG	82	int periods; /* period index of period_ptr */
9aaca968	83
6c742509	84	/* PDC register save */
9aaca968 GW	85	u32 pdc_xpr_save;
	86	u32 pdc_xcr_save;
	87	u32 pdc_xnpr_save;
	88	u32 pdc_xncr_save;
	89	};
	90
	91
9aaca968 GW	92	/--------------------------------------------------------------------------\
	93	* Helper functions
	94	\--------------------------------------------------------------------------/
6c742509 SG	95	static int atmel_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
6c742509 SG	96	int stream)
9aaca968 GW	97	{
9aaca968 GW	98	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
6c742509 SG	99	struct snd_dma_buffer *buf = &substream->dma_buffer;
	100	size_t size = atmel_pcm_hardware.buffer_bytes_max;
	101
	102	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	103	buf->dev.dev = pcm->card->dev;
	104	buf->private_data = NULL;
	105	buf->area = dma_alloc_coherent(pcm->card->dev, size,
	106	&buf->addr, GFP_KERNEL);
	107	pr_debug("atmel-pcm:"
	108	"preallocate_dma_buffer: area=%p, addr=%p, size=%d\n",
	109	(void *) buf->area,
	110	(void *) buf->addr,
	111	size);
	112
	113	if (!buf->area)
9aaca968 GW	114	return -ENOMEM;
9aaca968 GW	115
6c742509	116	buf->bytes = size;
9aaca968 GW	117	return 0;
9aaca968 GW	118	}
9aaca968 GW	119	/--------------------------------------------------------------------------\
	120	* ISR
	121	\--------------------------------------------------------------------------/
6c742509 SG	122	static void atmel_pcm_dma_irq(u32 ssc_sr,
6c742509 SG	123	struct snd_pcm_substream *substream)
9aaca968	124	{
6c742509 SG	125	struct atmel_runtime_data *prtd = substream->runtime->private_data;
6c742509 SG	126	struct atmel_pcm_dma_params *params = prtd->params;
9aaca968 GW	127	static int count;
	128
	129	count++;
6c742509	130
9aaca968	131	if (ssc_sr & params->mask->ssc_endbuf) {
6c742509 SG	132	pr_warning("atmel-pcm: buffer %s on %s"
	133	" (SSC_SR=%#x, count=%d)\n",
	134	substream->stream == SNDRV_PCM_STREAM_PLAYBACK
	135	? "underrun" : "overrun",
	136	params->name, ssc_sr, count);
9aaca968 GW	137
	138	/* re-start the PDC */
	139	ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
	140	params->mask->pdc_disable);
	141	prtd->period_ptr += prtd->period_size;
	142	if (prtd->period_ptr >= prtd->dma_buffer_end)
	143	prtd->period_ptr = prtd->dma_buffer;
	144
9aaca968 GW	145	ssc_writex(params->ssc->regs, params->pdc->xpr,
	146	prtd->period_ptr);
	147	ssc_writex(params->ssc->regs, params->pdc->xcr,
	148	prtd->period_size / params->pdc_xfer_size);
	149	ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
	150	params->mask->pdc_enable);
	151	}
	152
9aaca968 GW	153	if (ssc_sr & params->mask->ssc_endx) {
	154	/* Load the PDC next pointer and counter registers */
	155	prtd->period_ptr += prtd->period_size;
	156	if (prtd->period_ptr >= prtd->dma_buffer_end)
	157	prtd->period_ptr = prtd->dma_buffer;
6c742509	158
9aaca968 GW	159	ssc_writex(params->ssc->regs, params->pdc->xnpr,
	160	prtd->period_ptr);
	161	ssc_writex(params->ssc->regs, params->pdc->xncr,
	162	prtd->period_size / params->pdc_xfer_size);
	163	}
	164
9aaca968 GW	165	snd_pcm_period_elapsed(substream);
	166	}
	167
	168
9aaca968 GW	169	/--------------------------------------------------------------------------\
	170	* PCM operations
	171	\--------------------------------------------------------------------------/
6c742509 SG	172	static int atmel_pcm_hw_params(struct snd_pcm_substream *substream,
6c742509 SG	173	struct snd_pcm_hw_params *params)
9aaca968 GW	174	{
9aaca968 GW	175	struct snd_pcm_runtime *runtime = substream->runtime;
6c742509	176	struct atmel_runtime_data *prtd = runtime->private_data;
9aaca968 GW	177	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	178
	179	/* this may get called several times by oss emulation
6c742509 SG	180	* with different params */
6c742509 SG	181
9aaca968 GW	182	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	183	runtime->dma_bytes = params_buffer_bytes(params);
	184
	185	prtd->params = rtd->dai->cpu_dai->dma_data;
6c742509	186	prtd->params->dma_intr_handler = atmel_pcm_dma_irq;
9aaca968 GW	187
	188	prtd->dma_buffer = runtime->dma_addr;
	189	prtd->dma_buffer_end = runtime->dma_addr + runtime->dma_bytes;
	190	prtd->period_size = params_period_bytes(params);
	191
6c742509 SG	192	pr_debug("atmel-pcm: "
	193	"hw_params: DMA for %s initialized "
	194	"(dma_bytes=%u, period_size=%u)\n",
	195	prtd->params->name,
	196	runtime->dma_bytes,
	197	prtd->period_size);
9aaca968 GW	198	return 0;
	199	}
	200
6c742509	201	static int atmel_pcm_hw_free(struct snd_pcm_substream *substream)
9aaca968	202	{
6c742509 SG	203	struct atmel_runtime_data *prtd = substream->runtime->private_data;
6c742509 SG	204	struct atmel_pcm_dma_params *params = prtd->params;
9aaca968 GW	205
	206	if (params != NULL) {
	207	ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
	208	params->mask->pdc_disable);
	209	prtd->params->dma_intr_handler = NULL;
	210	}
	211
	212	return 0;
	213	}
	214
6c742509	215	static int atmel_pcm_prepare(struct snd_pcm_substream *substream)
9aaca968	216	{
6c742509 SG	217	struct atmel_runtime_data *prtd = substream->runtime->private_data;
6c742509 SG	218	struct atmel_pcm_dma_params *params = prtd->params;
9aaca968 GW	219
	220	ssc_writex(params->ssc->regs, SSC_IDR,
	221	params->mask->ssc_endx \| params->mask->ssc_endbuf);
	222	ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
	223	params->mask->pdc_disable);
9aaca968 GW	224	return 0;
	225	}
	226
6c742509 SG	227	static int atmel_pcm_trigger(struct snd_pcm_substream *substream,
6c742509 SG	228	int cmd)
9aaca968 GW	229	{
9aaca968 GW	230	struct snd_pcm_runtime *rtd = substream->runtime;
6c742509 SG	231	struct atmel_runtime_data *prtd = rtd->private_data;
6c742509 SG	232	struct atmel_pcm_dma_params *params = prtd->params;
9aaca968 GW	233	int ret = 0;
9aaca968 GW	234
6c742509 SG	235	pr_debug("atmel-pcm:buffer_size = %ld,"
	236	"dma_area = %p, dma_bytes = %u\n",
	237	rtd->buffer_size, rtd->dma_area, rtd->dma_bytes);
9aaca968 GW	238
	239	switch (cmd) {
	240	case SNDRV_PCM_TRIGGER_START:
	241	prtd->period_ptr = prtd->dma_buffer;
	242
	243	ssc_writex(params->ssc->regs, params->pdc->xpr,
	244	prtd->period_ptr);
	245	ssc_writex(params->ssc->regs, params->pdc->xcr,
	246	prtd->period_size / params->pdc_xfer_size);
	247
	248	prtd->period_ptr += prtd->period_size;
	249	ssc_writex(params->ssc->regs, params->pdc->xnpr,
	250	prtd->period_ptr);
	251	ssc_writex(params->ssc->regs, params->pdc->xncr,
	252	prtd->period_size / params->pdc_xfer_size);
	253
6c742509 SG	254	pr_debug("atmel-pcm: trigger: "
	255	"period_ptr=%lx, xpr=%u, "
	256	"xcr=%u, xnpr=%u, xncr=%u\n",
	257	(unsigned long)prtd->period_ptr,
	258	ssc_readx(params->ssc->regs, params->pdc->xpr),
	259	ssc_readx(params->ssc->regs, params->pdc->xcr),
	260	ssc_readx(params->ssc->regs, params->pdc->xnpr),
	261	ssc_readx(params->ssc->regs, params->pdc->xncr));
9aaca968 GW	262
	263	ssc_writex(params->ssc->regs, SSC_IER,
	264	params->mask->ssc_endx \| params->mask->ssc_endbuf);
	265	ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
	266	params->mask->pdc_enable);
	267
6c742509 SG	268	pr_debug("sr=%u imr=%u\n",
	269	ssc_readx(params->ssc->regs, SSC_SR),
	270	ssc_readx(params->ssc->regs, SSC_IER));
9aaca968 GW	271	break; /* SNDRV_PCM_TRIGGER_START */
9aaca968 GW	272
9aaca968 GW	273	case SNDRV_PCM_TRIGGER_STOP:
	274	case SNDRV_PCM_TRIGGER_SUSPEND:
	275	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	276	ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
	277	params->mask->pdc_disable);
	278	break;
	279
9aaca968 GW	280	case SNDRV_PCM_TRIGGER_RESUME:
	281	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	282	ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
	283	params->mask->pdc_enable);
	284	break;
	285
	286	default:
	287	ret = -EINVAL;
	288	}
	289
	290	return ret;
	291	}
	292
6c742509 SG	293	static snd_pcm_uframes_t atmel_pcm_pointer(
6c742509 SG	294	struct snd_pcm_substream *substream)
9aaca968 GW	295	{
9aaca968 GW	296	struct snd_pcm_runtime *runtime = substream->runtime;
6c742509 SG	297	struct atmel_runtime_data *prtd = runtime->private_data;
6c742509 SG	298	struct atmel_pcm_dma_params *params = prtd->params;
9aaca968 GW	299	dma_addr_t ptr;
	300	snd_pcm_uframes_t x;
	301
	302	ptr = (dma_addr_t) ssc_readx(params->ssc->regs, params->pdc->xpr);
	303	x = bytes_to_frames(runtime, ptr - prtd->dma_buffer);
	304
	305	if (x == runtime->buffer_size)
	306	x = 0;
	307
	308	return x;
	309	}
	310
6c742509	311	static int atmel_pcm_open(struct snd_pcm_substream *substream)
9aaca968 GW	312	{
9aaca968 GW	313	struct snd_pcm_runtime *runtime = substream->runtime;
6c742509	314	struct atmel_runtime_data *prtd;
9aaca968 GW	315	int ret = 0;
9aaca968 GW	316
6c742509	317	snd_soc_set_runtime_hwparams(substream, &atmel_pcm_hardware);
9aaca968 GW	318
	319	/* ensure that buffer size is a multiple of period size */
	320	ret = snd_pcm_hw_constraint_integer(runtime,
6c742509	321	SNDRV_PCM_HW_PARAM_PERIODS);
9aaca968 GW	322	if (ret < 0)
	323	goto out;
	324
6c742509	325	prtd = kzalloc(sizeof(struct atmel_runtime_data), GFP_KERNEL);
9aaca968 GW	326	if (prtd == NULL) {
	327	ret = -ENOMEM;
	328	goto out;
	329	}
	330	runtime->private_data = prtd;
	331
6c742509	332	out:
9aaca968 GW	333	return ret;
	334	}
	335
6c742509	336	static int atmel_pcm_close(struct snd_pcm_substream *substream)
9aaca968	337	{
6c742509	338	struct atmel_runtime_data *prtd = substream->runtime->private_data;
9aaca968 GW	339
	340	kfree(prtd);
	341	return 0;
	342	}
	343
6c742509 SG	344	static int atmel_pcm_mmap(struct snd_pcm_substream *substream,
6c742509 SG	345	struct vm_area_struct *vma)
9aaca968 GW	346	{
9aaca968 GW	347	return remap_pfn_range(vma, vma->vm_start,
6c742509 SG	348	substream->dma_buffer.addr >> PAGE_SHIFT,
6c742509 SG	349	vma->vm_end - vma->vm_start, vma->vm_page_prot);
9aaca968 GW	350	}
9aaca968 GW	351
6c742509 SG	352	struct snd_pcm_ops atmel_pcm_ops = {
	353	.open = atmel_pcm_open,
	354	.close = atmel_pcm_close,
	355	.ioctl = snd_pcm_lib_ioctl,
	356	.hw_params = atmel_pcm_hw_params,
	357	.hw_free = atmel_pcm_hw_free,
	358	.prepare = atmel_pcm_prepare,
	359	.trigger = atmel_pcm_trigger,
	360	.pointer = atmel_pcm_pointer,
	361	.mmap = atmel_pcm_mmap,
9aaca968 GW	362	};
	363
	364
9aaca968 GW	365	/--------------------------------------------------------------------------\
	366	* ASoC platform driver
	367	\--------------------------------------------------------------------------/
6c742509	368	static u64 atmel_pcm_dmamask = 0xffffffff;
9aaca968	369
6c742509 SG	370	static int atmel_pcm_new(struct snd_card *card,
6c742509 SG	371	struct snd_soc_dai dai, struct snd_pcm pcm)
9aaca968 GW	372	{
	373	int ret = 0;
	374
	375	if (!card->dev->dma_mask)
6c742509	376	card->dev->dma_mask = &atmel_pcm_dmamask;
9aaca968 GW	377	if (!card->dev->coherent_dma_mask)
	378	card->dev->coherent_dma_mask = 0xffffffff;
	379
	380	if (dai->playback.channels_min) {
6c742509 SG	381	ret = atmel_pcm_preallocate_dma_buffer(pcm,
6c742509 SG	382	SNDRV_PCM_STREAM_PLAYBACK);
9aaca968 GW	383	if (ret)
	384	goto out;
	385	}
	386
	387	if (dai->capture.channels_min) {
6c742509 SG	388	pr_debug("at32-pcm:"
	389	"Allocating PCM capture DMA buffer\n");
	390	ret = atmel_pcm_preallocate_dma_buffer(pcm,
	391	SNDRV_PCM_STREAM_CAPTURE);
9aaca968 GW	392	if (ret)
	393	goto out;
	394	}
6c742509	395	out:
9aaca968 GW	396	return ret;
	397	}
	398
6c742509	399	static void atmel_pcm_free_dma_buffers(struct snd_pcm *pcm)
9aaca968 GW	400	{
	401	struct snd_pcm_substream *substream;
	402	struct snd_dma_buffer *buf;
	403	int stream;
	404
	405	for (stream = 0; stream < 2; stream++) {
	406	substream = pcm->streams[stream].substream;
6c742509	407	if (!substream)
9aaca968 GW	408	continue;
	409
	410	buf = &substream->dma_buffer;
	411	if (!buf->area)
	412	continue;
	413	dma_free_coherent(pcm->card->dev, buf->bytes,
	414	buf->area, buf->addr);
	415	buf->area = NULL;
	416	}
	417	}
	418
9aaca968	419	#ifdef CONFIG_PM
07c84d04	420	static int atmel_pcm_suspend(struct snd_soc_dai *dai)
9aaca968 GW	421	{
9aaca968 GW	422	struct snd_pcm_runtime *runtime = dai->runtime;
6c742509 SG	423	struct atmel_runtime_data *prtd;
6c742509 SG	424	struct atmel_pcm_dma_params *params;
9aaca968	425
6c742509	426	if (!runtime)
9aaca968	427	return 0;
6c742509	428
9aaca968 GW	429	prtd = runtime->private_data;
	430	params = prtd->params;
	431
6c742509 SG	432	/* disable the PDC and save the PDC registers */
	433
	434	ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_disable);
9aaca968 GW	435
	436	prtd->pdc_xpr_save = ssc_readx(params->ssc->regs, params->pdc->xpr);
	437	prtd->pdc_xcr_save = ssc_readx(params->ssc->regs, params->pdc->xcr);
	438	prtd->pdc_xnpr_save = ssc_readx(params->ssc->regs, params->pdc->xnpr);
	439	prtd->pdc_xncr_save = ssc_readx(params->ssc->regs, params->pdc->xncr);
	440
	441	return 0;
	442	}
	443
07c84d04	444	static int atmel_pcm_resume(struct snd_soc_dai *dai)
9aaca968 GW	445	{
9aaca968 GW	446	struct snd_pcm_runtime *runtime = dai->runtime;
6c742509 SG	447	struct atmel_runtime_data *prtd;
6c742509 SG	448	struct atmel_pcm_dma_params *params;
9aaca968	449
6c742509	450	if (!runtime)
9aaca968	451	return 0;
6c742509	452
9aaca968 GW	453	prtd = runtime->private_data;
	454	params = prtd->params;
	455
6c742509	456	/* restore the PDC registers and enable the PDC */
9aaca968 GW	457	ssc_writex(params->ssc->regs, params->pdc->xpr, prtd->pdc_xpr_save);
	458	ssc_writex(params->ssc->regs, params->pdc->xcr, prtd->pdc_xcr_save);
	459	ssc_writex(params->ssc->regs, params->pdc->xnpr, prtd->pdc_xnpr_save);
	460	ssc_writex(params->ssc->regs, params->pdc->xncr, prtd->pdc_xncr_save);
	461
6c742509	462	ssc_writel(params->ssc->regs, PDC_PTCR, params->mask->pdc_enable);
9aaca968 GW	463	return 0;
9aaca968 GW	464	}
6c742509 SG	465	#else
	466	#define atmel_pcm_suspend NULL
	467	#define atmel_pcm_resume NULL
	468	#endif
	469
	470	struct snd_soc_platform atmel_soc_platform = {
	471	.name = "atmel-audio",
	472	.pcm_ops = &atmel_pcm_ops,
	473	.pcm_new = atmel_pcm_new,
	474	.pcm_free = atmel_pcm_free_dma_buffers,
	475	.suspend = atmel_pcm_suspend,
	476	.resume = atmel_pcm_resume,
9aaca968	477	};
6c742509	478	EXPORT_SYMBOL_GPL(atmel_soc_platform);
9aaca968	479
c9b3a40f	480	static int __init atmel_pcm_modinit(void)
958e792c MB	481	{
	482	return snd_soc_register_platform(&atmel_soc_platform);
	483	}
	484	module_init(atmel_pcm_modinit);
	485
471716f7	486	static void __exit atmel_pcm_modexit(void)
958e792c MB	487	{
	488	snd_soc_unregister_platform(&atmel_soc_platform);
	489	}
	490	module_exit(atmel_pcm_modexit);
	491
6c742509 SG	492	MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
6c742509 SG	493	MODULE_DESCRIPTION("Atmel PCM module");
9aaca968	494	MODULE_LICENSE("GPL");