[linux-2.6-block.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 */
	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);
}

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_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 "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 SG	79	dma_addr_t period_ptr; /* physical address of next period */
6c742509 SG	80	int periods; /* period index of period_ptr */
9aaca968	81
6c742509	82	/* PDC register save */
9aaca968 GW	83	u32 pdc_xpr_save;
	84	u32 pdc_xcr_save;
	85	u32 pdc_xnpr_save;
	86	u32 pdc_xncr_save;
	87	};
	88
	89
9aaca968 GW	90	/--------------------------------------------------------------------------\
	91	* Helper functions
	92	\--------------------------------------------------------------------------/
6c742509 SG	93	static int atmel_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
6c742509 SG	94	int stream)
9aaca968 GW	95	{
9aaca968 GW	96	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
6c742509 SG	97	struct snd_dma_buffer *buf = &substream->dma_buffer;
	98	size_t size = atmel_pcm_hardware.buffer_bytes_max;
	99
	100	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	101	buf->dev.dev = pcm->card->dev;
	102	buf->private_data = NULL;
	103	buf->area = dma_alloc_coherent(pcm->card->dev, size,
	104	&buf->addr, GFP_KERNEL);
	105	pr_debug("atmel-pcm:"
	106	"preallocate_dma_buffer: area=%p, addr=%p, size=%d\n",
	107	(void *) buf->area,
	108	(void *) buf->addr,
	109	size);
	110
	111	if (!buf->area)
9aaca968 GW	112	return -ENOMEM;
9aaca968 GW	113
6c742509	114	buf->bytes = size;
9aaca968 GW	115	return 0;
9aaca968 GW	116	}
9aaca968 GW	117	/--------------------------------------------------------------------------\
	118	* ISR
	119	\--------------------------------------------------------------------------/
6c742509 SG	120	static void atmel_pcm_dma_irq(u32 ssc_sr,
6c742509 SG	121	struct snd_pcm_substream *substream)
9aaca968	122	{
6c742509 SG	123	struct atmel_runtime_data *prtd = substream->runtime->private_data;
6c742509 SG	124	struct atmel_pcm_dma_params *params = prtd->params;
9aaca968 GW	125	static int count;
	126
	127	count++;
6c742509	128
9aaca968	129	if (ssc_sr & params->mask->ssc_endbuf) {
6c742509 SG	130	pr_warning("atmel-pcm: buffer %s on %s"
	131	" (SSC_SR=%#x, count=%d)\n",
	132	substream->stream == SNDRV_PCM_STREAM_PLAYBACK
	133	? "underrun" : "overrun",
	134	params->name, ssc_sr, count);
9aaca968 GW	135
	136	/* re-start the PDC */
	137	ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
	138	params->mask->pdc_disable);
	139	prtd->period_ptr += prtd->period_size;
	140	if (prtd->period_ptr >= prtd->dma_buffer_end)
	141	prtd->period_ptr = prtd->dma_buffer;
	142
9aaca968 GW	143	ssc_writex(params->ssc->regs, params->pdc->xpr,
	144	prtd->period_ptr);
	145	ssc_writex(params->ssc->regs, params->pdc->xcr,
	146	prtd->period_size / params->pdc_xfer_size);
	147	ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
	148	params->mask->pdc_enable);
	149	}
	150
9aaca968 GW	151	if (ssc_sr & params->mask->ssc_endx) {
	152	/* Load the PDC next pointer and counter registers */
	153	prtd->period_ptr += prtd->period_size;
	154	if (prtd->period_ptr >= prtd->dma_buffer_end)
	155	prtd->period_ptr = prtd->dma_buffer;
6c742509	156
9aaca968 GW	157	ssc_writex(params->ssc->regs, params->pdc->xnpr,
	158	prtd->period_ptr);
	159	ssc_writex(params->ssc->regs, params->pdc->xncr,
	160	prtd->period_size / params->pdc_xfer_size);
	161	}
	162
9aaca968 GW	163	snd_pcm_period_elapsed(substream);
	164	}
	165
	166
9aaca968 GW	167	/--------------------------------------------------------------------------\
	168	* PCM operations
	169	\--------------------------------------------------------------------------/
6c742509 SG	170	static int atmel_pcm_hw_params(struct snd_pcm_substream *substream,
6c742509 SG	171	struct snd_pcm_hw_params *params)
9aaca968 GW	172	{
9aaca968 GW	173	struct snd_pcm_runtime *runtime = substream->runtime;
6c742509	174	struct atmel_runtime_data *prtd = runtime->private_data;
9aaca968 GW	175	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	176
	177	/* this may get called several times by oss emulation
6c742509 SG	178	* with different params */
6c742509 SG	179
9aaca968 GW	180	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	181	runtime->dma_bytes = params_buffer_bytes(params);
	182
	183	prtd->params = rtd->dai->cpu_dai->dma_data;
6c742509	184	prtd->params->dma_intr_handler = atmel_pcm_dma_irq;
9aaca968 GW	185
	186	prtd->dma_buffer = runtime->dma_addr;
	187	prtd->dma_buffer_end = runtime->dma_addr + runtime->dma_bytes;
	188	prtd->period_size = params_period_bytes(params);
	189
6c742509 SG	190	pr_debug("atmel-pcm: "
	191	"hw_params: DMA for %s initialized "
	192	"(dma_bytes=%u, period_size=%u)\n",
	193	prtd->params->name,
	194	runtime->dma_bytes,
	195	prtd->period_size);
9aaca968 GW	196	return 0;
	197	}
	198
6c742509	199	static int atmel_pcm_hw_free(struct snd_pcm_substream *substream)
9aaca968	200	{
6c742509 SG	201	struct atmel_runtime_data *prtd = substream->runtime->private_data;
6c742509 SG	202	struct atmel_pcm_dma_params *params = prtd->params;
9aaca968 GW	203
	204	if (params != NULL) {
	205	ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
	206	params->mask->pdc_disable);
	207	prtd->params->dma_intr_handler = NULL;
	208	}
	209
	210	return 0;
	211	}
	212
6c742509	213	static int atmel_pcm_prepare(struct snd_pcm_substream *substream)
9aaca968	214	{
6c742509 SG	215	struct atmel_runtime_data *prtd = substream->runtime->private_data;
6c742509 SG	216	struct atmel_pcm_dma_params *params = prtd->params;
9aaca968 GW	217
	218	ssc_writex(params->ssc->regs, SSC_IDR,
	219	params->mask->ssc_endx \| params->mask->ssc_endbuf);
	220	ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
	221	params->mask->pdc_disable);
9aaca968 GW	222	return 0;
	223	}
	224
6c742509 SG	225	static int atmel_pcm_trigger(struct snd_pcm_substream *substream,
6c742509 SG	226	int cmd)
9aaca968 GW	227	{
9aaca968 GW	228	struct snd_pcm_runtime *rtd = substream->runtime;
6c742509 SG	229	struct atmel_runtime_data *prtd = rtd->private_data;
6c742509 SG	230	struct atmel_pcm_dma_params *params = prtd->params;
9aaca968 GW	231	int ret = 0;
9aaca968 GW	232
6c742509 SG	233	pr_debug("atmel-pcm:buffer_size = %ld,"
	234	"dma_area = %p, dma_bytes = %u\n",
	235	rtd->buffer_size, rtd->dma_area, rtd->dma_bytes);
9aaca968 GW	236
	237	switch (cmd) {
	238	case SNDRV_PCM_TRIGGER_START:
	239	prtd->period_ptr = prtd->dma_buffer;
	240
	241	ssc_writex(params->ssc->regs, params->pdc->xpr,
	242	prtd->period_ptr);
	243	ssc_writex(params->ssc->regs, params->pdc->xcr,
	244	prtd->period_size / params->pdc_xfer_size);
	245
	246	prtd->period_ptr += prtd->period_size;
	247	ssc_writex(params->ssc->regs, params->pdc->xnpr,
	248	prtd->period_ptr);
	249	ssc_writex(params->ssc->regs, params->pdc->xncr,
	250	prtd->period_size / params->pdc_xfer_size);
	251
6c742509 SG	252	pr_debug("atmel-pcm: trigger: "
	253	"period_ptr=%lx, xpr=%u, "
	254	"xcr=%u, xnpr=%u, xncr=%u\n",
	255	(unsigned long)prtd->period_ptr,
	256	ssc_readx(params->ssc->regs, params->pdc->xpr),
	257	ssc_readx(params->ssc->regs, params->pdc->xcr),
	258	ssc_readx(params->ssc->regs, params->pdc->xnpr),
	259	ssc_readx(params->ssc->regs, params->pdc->xncr));
9aaca968 GW	260
	261	ssc_writex(params->ssc->regs, SSC_IER,
	262	params->mask->ssc_endx \| params->mask->ssc_endbuf);
	263	ssc_writex(params->ssc->regs, SSC_PDC_PTCR,
	264	params->mask->pdc_enable);
	265
6c742509 SG	266	pr_debug("sr=%u imr=%u\n",
	267	ssc_readx(params->ssc->regs, SSC_SR),
	268	ssc_readx(params->ssc->regs, SSC_IER));
9aaca968 GW	269	break; /* SNDRV_PCM_TRIGGER_START */
9aaca968 GW	270
9aaca968 GW	271	case SNDRV_PCM_TRIGGER_STOP:
	272	case SNDRV_PCM_TRIGGER_SUSPEND:
	273	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	274	ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
	275	params->mask->pdc_disable);
	276	break;
	277
9aaca968 GW	278	case SNDRV_PCM_TRIGGER_RESUME:
	279	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	280	ssc_writex(params->ssc->regs, ATMEL_PDC_PTCR,
	281	params->mask->pdc_enable);
	282	break;
	283
	284	default:
	285	ret = -EINVAL;
	286	}
	287
	288	return ret;
	289	}
	290
6c742509 SG	291	static snd_pcm_uframes_t atmel_pcm_pointer(
6c742509 SG	292	struct snd_pcm_substream *substream)
9aaca968 GW	293	{
9aaca968 GW	294	struct snd_pcm_runtime *runtime = substream->runtime;
6c742509 SG	295	struct atmel_runtime_data *prtd = runtime->private_data;
6c742509 SG	296	struct atmel_pcm_dma_params *params = prtd->params;
9aaca968 GW	297	dma_addr_t ptr;
	298	snd_pcm_uframes_t x;
	299
	300	ptr = (dma_addr_t) ssc_readx(params->ssc->regs, params->pdc->xpr);
	301	x = bytes_to_frames(runtime, ptr - prtd->dma_buffer);
	302
	303	if (x == runtime->buffer_size)
	304	x = 0;
	305
	306	return x;
	307	}
	308
6c742509	309	static int atmel_pcm_open(struct snd_pcm_substream *substream)
9aaca968 GW	310	{
9aaca968 GW	311	struct snd_pcm_runtime *runtime = substream->runtime;
6c742509	312	struct atmel_runtime_data *prtd;
9aaca968 GW	313	int ret = 0;
9aaca968 GW	314
6c742509	315	snd_soc_set_runtime_hwparams(substream, &atmel_pcm_hardware);
9aaca968 GW	316
	317	/* ensure that buffer size is a multiple of period size */
	318	ret = snd_pcm_hw_constraint_integer(runtime,
6c742509	319	SNDRV_PCM_HW_PARAM_PERIODS);
9aaca968 GW	320	if (ret < 0)
	321	goto out;
	322
6c742509	323	prtd = kzalloc(sizeof(struct atmel_runtime_data), GFP_KERNEL);
9aaca968 GW	324	if (prtd == NULL) {
	325	ret = -ENOMEM;
	326	goto out;
	327	}
	328	runtime->private_data = prtd;
	329
6c742509	330	out:
9aaca968 GW	331	return ret;
	332	}
	333
6c742509	334	static int atmel_pcm_close(struct snd_pcm_substream *substream)
9aaca968	335	{
6c742509	336	struct atmel_runtime_data *prtd = substream->runtime->private_data;
9aaca968 GW	337
	338	kfree(prtd);
	339	return 0;
	340	}
	341
6c742509 SG	342	static int atmel_pcm_mmap(struct snd_pcm_substream *substream,
6c742509 SG	343	struct vm_area_struct *vma)
9aaca968 GW	344	{
9aaca968 GW	345	return remap_pfn_range(vma, vma->vm_start,
6c742509 SG	346	substream->dma_buffer.addr >> PAGE_SHIFT,
6c742509 SG	347	vma->vm_end - vma->vm_start, vma->vm_page_prot);
9aaca968 GW	348	}
9aaca968 GW	349
b2a19d02	350	static struct snd_pcm_ops atmel_pcm_ops = {
6c742509 SG	351	.open = atmel_pcm_open,
	352	.close = atmel_pcm_close,
	353	.ioctl = snd_pcm_lib_ioctl,
	354	.hw_params = atmel_pcm_hw_params,
	355	.hw_free = atmel_pcm_hw_free,
	356	.prepare = atmel_pcm_prepare,
	357	.trigger = atmel_pcm_trigger,
	358	.pointer = atmel_pcm_pointer,
	359	.mmap = atmel_pcm_mmap,
9aaca968 GW	360	};
	361
	362
9aaca968 GW	363	/--------------------------------------------------------------------------\
	364	* ASoC platform driver
	365	\--------------------------------------------------------------------------/
6c742509	366	static u64 atmel_pcm_dmamask = 0xffffffff;
9aaca968	367
6c742509 SG	368	static int atmel_pcm_new(struct snd_card *card,
6c742509 SG	369	struct snd_soc_dai dai, struct snd_pcm pcm)
9aaca968 GW	370	{
	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
	378	if (dai->playback.channels_min) {
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
	385	if (dai->capture.channels_min) {
6c742509 SG	386	pr_debug("at32-pcm:"
	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
07c84d04	418	static int atmel_pcm_suspend(struct snd_soc_dai *dai)
9aaca968 GW	419	{
9aaca968 GW	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
07c84d04	442	static int atmel_pcm_resume(struct snd_soc_dai *dai)
9aaca968 GW	443	{
9aaca968 GW	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
	468	struct snd_soc_platform atmel_soc_platform = {
	469	.name = "atmel-audio",
	470	.pcm_ops = &atmel_pcm_ops,
	471	.pcm_new = atmel_pcm_new,
	472	.pcm_free = atmel_pcm_free_dma_buffers,
	473	.suspend = atmel_pcm_suspend,
	474	.resume = atmel_pcm_resume,
9aaca968	475	};
6c742509	476	EXPORT_SYMBOL_GPL(atmel_soc_platform);
9aaca968	477
c9b3a40f	478	static int __init atmel_pcm_modinit(void)
958e792c MB	479	{
	480	return snd_soc_register_platform(&atmel_soc_platform);
	481	}
	482	module_init(atmel_pcm_modinit);
	483
471716f7	484	static void __exit atmel_pcm_modexit(void)
958e792c MB	485	{
	486	snd_soc_unregister_platform(&atmel_soc_platform);
	487	}
	488	module_exit(atmel_pcm_modexit);
	489
6c742509 SG	490	MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
6c742509 SG	491	MODULE_DESCRIPTION("Atmel PCM module");
9aaca968	492	MODULE_LICENSE("GPL");