sound/arm/pxa2xx-pcm.c - kernel/msm-4.9 - Gitiles

 /*
  * linux/sound/arm/pxa2xx-pcm.c -- ALSA PCM interface for the Intel PXA2xx chip
  *
  * 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 version 2 as
  * published by the Free Software Foundation.
  */

 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/device.h>
 #include <linux/slab.h>
 #include <linux/dma-mapping.h>

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

 #include <asm/dma.h>
 #include <asm/hardware.h>
 #include <asm/arch/pxa-regs.h>

 #include "pxa2xx-pcm.h"


 static const struct snd_pcm_hardware pxa2xx_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 - 32,
 	.periods_min		= 1,
 	.periods_max		= PAGE_SIZE/sizeof(pxa_dma_desc),
 	.buffer_bytes_max	= 128 * 1024,
 	.fifo_size		= 32,
 };

 struct pxa2xx_runtime_data {
 	int dma_ch;
 	struct pxa2xx_pcm_dma_params *params;
 	pxa_dma_desc *dma_desc_array;
 	dma_addr_t dma_desc_array_phys;
 };

 static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
 				struct snd_pcm_hw_params *params)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct pxa2xx_runtime_data *rtd = runtime->private_data;
 	size_t totsize = params_buffer_bytes(params);
 	size_t period = params_period_bytes(params);
 	pxa_dma_desc *dma_desc;
 	dma_addr_t dma_buff_phys, next_desc_phys;

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

 	dma_desc = rtd->dma_desc_array;
 	next_desc_phys = rtd->dma_desc_array_phys;
 	dma_buff_phys = runtime->dma_addr;
 	do {
 		next_desc_phys += sizeof(pxa_dma_desc);
 		dma_desc->ddadr = next_desc_phys;
 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 			dma_desc->dsadr = dma_buff_phys;
 			dma_desc->dtadr = rtd->params->dev_addr;
 		} else {
 			dma_desc->dsadr = rtd->params->dev_addr;
 			dma_desc->dtadr = dma_buff_phys;
 		}
 		if (period > totsize)
 			period = totsize;
 		dma_desc->dcmd = rtd->params->dcmd | period | DCMD_ENDIRQEN;
 		dma_desc++;
 		dma_buff_phys += period;
 	} while (totsize -= period);
 	dma_desc[-1].ddadr = rtd->dma_desc_array_phys;

 	return 0;
 }

 static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
 {
 	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;

 	*rtd->params->drcmr = 0;
 	snd_pcm_set_runtime_buffer(substream, NULL);
 	return 0;
 }

 static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
 {
 	struct pxa2xx_pcm_client *client = substream->private_data;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct pxa2xx_runtime_data *rtd = runtime->private_data;

 	DCSR(rtd->dma_ch) &= ~DCSR_RUN;
 	DCSR(rtd->dma_ch) = 0;
 	DCMD(rtd->dma_ch) = 0;
 	*rtd->params->drcmr = rtd->dma_ch | DRCMR_MAPVLD;

 	return client->prepare(substream);
 }

 static int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 {
 	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
 	int ret = 0;

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 		DDADR(rtd->dma_ch) = rtd->dma_desc_array_phys;
 		DCSR(rtd->dma_ch) = DCSR_RUN;
 		break;

 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		DCSR(rtd->dma_ch) &= ~DCSR_RUN;
 		break;

 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		DCSR(rtd->dma_ch) |= DCSR_RUN;
 		break;

 	default:
 		ret = -EINVAL;
 	}

 	return ret;
 }

 static void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
 {
 	struct snd_pcm_substream *substream = dev_id;
 	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
 	int dcsr;

 	dcsr = DCSR(dma_ch);
 	DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;

 	if (dcsr & DCSR_ENDINTR) {
 		snd_pcm_period_elapsed(substream);
 	} else {
 		printk( KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
 			rtd->params->name, dma_ch, dcsr );
 		snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
 	}
 }

 static snd_pcm_uframes_t pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct pxa2xx_runtime_data *rtd = runtime->private_data;
 	dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 			 DSADR(rtd->dma_ch) : DTADR(rtd->dma_ch);
 	snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);
 	if (x == runtime->buffer_size)
 		x = 0;
 	return x;
 }

 static int
 pxa2xx_pcm_hw_rule_mult32(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
 {
 	struct snd_interval *i = hw_param_interval(params, rule->var);
 	int changed = 0;

 	if (i->min & 31) {
 		i->min = (i->min & ~31) + 32;
 		i->openmin = 0;
 		changed = 1;
 	}

 	if (i->max & 31) {
 		i->max &= ~31;
 		i->openmax = 0;
 		changed = 1;
 	}

 	return changed;
 }

 static int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
 {
 	struct pxa2xx_pcm_client *client = substream->private_data;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct pxa2xx_runtime_data *rtd;
 	int ret;

 	runtime->hw = pxa2xx_pcm_hardware;

 	/*
 	 * For mysterious reasons (and despite what the manual says)
 	 * playback samples are lost if the DMA count is not a multiple
 	 * of the DMA burst size.  Let's add a rule to enforce that.
 	 */
 	ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
 				  pxa2xx_pcm_hw_rule_mult32, NULL,
 				  SNDRV_PCM_HW_PARAM_PERIOD_BYTES, -1);
 	if (ret)
 		goto out;
 	ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 				  pxa2xx_pcm_hw_rule_mult32, NULL,
 				  SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
 	if (ret)
 		goto out;

 	ret = -ENOMEM;
 	rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
 	if (!rtd)
 		goto out;
 	rtd->dma_desc_array =
 		dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
 				       &rtd->dma_desc_array_phys, GFP_KERNEL);
 	if (!rtd->dma_desc_array)
 		goto err1;

 	rtd->params = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 		      client->playback_params : client->capture_params;
 	ret = pxa_request_dma(rtd->params->name, DMA_PRIO_LOW,
 			      pxa2xx_pcm_dma_irq, substream);
 	if (ret < 0)
 		goto err2;
 	rtd->dma_ch = ret;

 	runtime->private_data = rtd;
 	ret = client->startup(substream);
 	if (!ret)
 		goto out;

 	pxa_free_dma(rtd->dma_ch);
  err2:
 	dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
 			      rtd->dma_desc_array, rtd->dma_desc_array_phys);
  err1:
 	kfree(rtd);
  out:
 	return ret;
 }

 static int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
 {
 	struct pxa2xx_pcm_client *client = substream->private_data;
 	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;

 	pxa_free_dma(rtd->dma_ch);
 	client->shutdown(substream);
 	dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
 			      rtd->dma_desc_array, rtd->dma_desc_array_phys);
 	kfree(rtd);
 	return 0;
 }

 static int
 pxa2xx_pcm_mmap(struct snd_pcm_substream *substream, struct vm_area_struct *vma)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 				     runtime->dma_area,
 				     runtime->dma_addr,
 				     runtime->dma_bytes);
 }

 static struct snd_pcm_ops pxa2xx_pcm_ops = {
 	.open		= pxa2xx_pcm_open,
 	.close		= pxa2xx_pcm_close,
 	.ioctl		= snd_pcm_lib_ioctl,
 	.hw_params	= pxa2xx_pcm_hw_params,
 	.hw_free	= pxa2xx_pcm_hw_free,
 	.prepare	= pxa2xx_pcm_prepare,
 	.trigger	= pxa2xx_pcm_trigger,
 	.pointer	= pxa2xx_pcm_pointer,
 	.mmap		= pxa2xx_pcm_mmap,
 };

 static int pxa2xx_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 = pxa2xx_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_writecombine(pcm->card->dev, size,
 					   &buf->addr, GFP_KERNEL);
 	if (!buf->area)
 		return -ENOMEM;
 	buf->bytes = size;
 	return 0;
 }

 static void pxa2xx_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_writecombine(pcm->card->dev, buf->bytes,
 				      buf->area, buf->addr);
 		buf->area = NULL;
 	}
 }

 static u64 pxa2xx_pcm_dmamask = 0xffffffff;

 int pxa2xx_pcm_new(struct snd_card *card, struct pxa2xx_pcm_client *client,
 		   struct snd_pcm **rpcm)
 {
 	struct snd_pcm *pcm;
 	int play = client->playback_params ? 1 : 0;
 	int capt = client->capture_params ? 1 : 0;
 	int ret;

 	ret = snd_pcm_new(card, "PXA2xx-PCM", 0, play, capt, &pcm);
 	if (ret)
 		goto out;

 	pcm->private_data = client;
 	pcm->private_free = pxa2xx_pcm_free_dma_buffers;

 	if (!card->dev->dma_mask)
 		card->dev->dma_mask = &pxa2xx_pcm_dmamask;
 	if (!card->dev->coherent_dma_mask)
 		card->dev->coherent_dma_mask = 0xffffffff;

 	if (play) {
 		int stream = SNDRV_PCM_STREAM_PLAYBACK;
 		snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
 		ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
 		if (ret)
 			goto out;
 	}
 	if (capt) {
 		int stream = SNDRV_PCM_STREAM_CAPTURE;
 		snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
 		ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
 		if (ret)
 			goto out;
 	}

 	if (rpcm)
 		*rpcm = pcm;
 	ret = 0;

  out:
 	return ret;
 }

 EXPORT_SYMBOL(pxa2xx_pcm_new);

 MODULE_AUTHOR("Nicolas Pitre");
 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
 MODULE_LICENSE("GPL");
	/*
	* linux/sound/arm/pxa2xx-pcm.c -- ALSA PCM interface for the Intel PXA2xx chip
	*
	* 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 version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/device.h>
	#include <linux/slab.h>
	#include <linux/dma-mapping.h>

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

	#include <asm/dma.h>
	#include <asm/hardware.h>
	#include <asm/arch/pxa-regs.h>

	#include "pxa2xx-pcm.h"


	static const struct snd_pcm_hardware pxa2xx_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 - 32,
	.periods_min = 1,
	.periods_max = PAGE_SIZE/sizeof(pxa_dma_desc),
	.buffer_bytes_max = 128 * 1024,
	.fifo_size = 32,
	};

	struct pxa2xx_runtime_data {
	int dma_ch;
	struct pxa2xx_pcm_dma_params *params;
	pxa_dma_desc *dma_desc_array;
	dma_addr_t dma_desc_array_phys;
	};

	static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct pxa2xx_runtime_data *rtd = runtime->private_data;
	size_t totsize = params_buffer_bytes(params);
	size_t period = params_period_bytes(params);
	pxa_dma_desc *dma_desc;
	dma_addr_t dma_buff_phys, next_desc_phys;

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

	dma_desc = rtd->dma_desc_array;
	next_desc_phys = rtd->dma_desc_array_phys;
	dma_buff_phys = runtime->dma_addr;
	do {
	next_desc_phys += sizeof(pxa_dma_desc);
	dma_desc->ddadr = next_desc_phys;
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	dma_desc->dsadr = dma_buff_phys;
	dma_desc->dtadr = rtd->params->dev_addr;
	} else {
	dma_desc->dsadr = rtd->params->dev_addr;
	dma_desc->dtadr = dma_buff_phys;
	}
	if (period > totsize)
	period = totsize;
	dma_desc->dcmd = rtd->params->dcmd \| period \| DCMD_ENDIRQEN;
	dma_desc++;
	dma_buff_phys += period;
	} while (totsize -= period);
	dma_desc[-1].ddadr = rtd->dma_desc_array_phys;

	return 0;
	}

	static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
	{
	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;

	*rtd->params->drcmr = 0;
	snd_pcm_set_runtime_buffer(substream, NULL);
	return 0;
	}

	static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
	{
	struct pxa2xx_pcm_client *client = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct pxa2xx_runtime_data *rtd = runtime->private_data;

	DCSR(rtd->dma_ch) &= ~DCSR_RUN;
	DCSR(rtd->dma_ch) = 0;
	DCMD(rtd->dma_ch) = 0;
	*rtd->params->drcmr = rtd->dma_ch \| DRCMR_MAPVLD;

	return client->prepare(substream);
	}

	static int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	{
	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
	int ret = 0;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	DDADR(rtd->dma_ch) = rtd->dma_desc_array_phys;
	DCSR(rtd->dma_ch) = DCSR_RUN;
	break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	DCSR(rtd->dma_ch) &= ~DCSR_RUN;
	break;

	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	DCSR(rtd->dma_ch) \|= DCSR_RUN;
	break;

	default:
	ret = -EINVAL;
	}

	return ret;
	}

	static void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
	{
	struct snd_pcm_substream *substream = dev_id;
	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
	int dcsr;

	dcsr = DCSR(dma_ch);
	DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;

	if (dcsr & DCSR_ENDINTR) {
	snd_pcm_period_elapsed(substream);
	} else {
	printk( KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
	rtd->params->name, dma_ch, dcsr );
	snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
	}
	}

	static snd_pcm_uframes_t pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct pxa2xx_runtime_data *rtd = runtime->private_data;
	dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
	DSADR(rtd->dma_ch) : DTADR(rtd->dma_ch);
	snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);
	if (x == runtime->buffer_size)
	x = 0;
	return x;
	}

	static int
	pxa2xx_pcm_hw_rule_mult32(struct snd_pcm_hw_params params, struct snd_pcm_hw_rule rule)
	{
	struct snd_interval *i = hw_param_interval(params, rule->var);
	int changed = 0;

	if (i->min & 31) {
	i->min = (i->min & ~31) + 32;
	i->openmin = 0;
	changed = 1;
	}

	if (i->max & 31) {
	i->max &= ~31;
	i->openmax = 0;
	changed = 1;
	}

	return changed;
	}

	static int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
	{
	struct pxa2xx_pcm_client *client = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct pxa2xx_runtime_data *rtd;
	int ret;

	runtime->hw = pxa2xx_pcm_hardware;

	/*
	* For mysterious reasons (and despite what the manual says)
	* playback samples are lost if the DMA count is not a multiple
	* of the DMA burst size. Let's add a rule to enforce that.
	*/
	ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
	pxa2xx_pcm_hw_rule_mult32, NULL,
	SNDRV_PCM_HW_PARAM_PERIOD_BYTES, -1);
	if (ret)
	goto out;
	ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
	pxa2xx_pcm_hw_rule_mult32, NULL,
	SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
	if (ret)
	goto out;

	ret = -ENOMEM;
	rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
	if (!rtd)
	goto out;
	rtd->dma_desc_array =
	dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
	&rtd->dma_desc_array_phys, GFP_KERNEL);
	if (!rtd->dma_desc_array)
	goto err1;

	rtd->params = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
	client->playback_params : client->capture_params;
	ret = pxa_request_dma(rtd->params->name, DMA_PRIO_LOW,
	pxa2xx_pcm_dma_irq, substream);
	if (ret < 0)
	goto err2;
	rtd->dma_ch = ret;

	runtime->private_data = rtd;
	ret = client->startup(substream);
	if (!ret)
	goto out;

	pxa_free_dma(rtd->dma_ch);
	err2:
	dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
	rtd->dma_desc_array, rtd->dma_desc_array_phys);
	err1:
	kfree(rtd);
	out:
	return ret;
	}

	static int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
	{
	struct pxa2xx_pcm_client *client = substream->private_data;
	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;

	pxa_free_dma(rtd->dma_ch);
	client->shutdown(substream);
	dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
	rtd->dma_desc_array, rtd->dma_desc_array_phys);
	kfree(rtd);
	return 0;
	}

	static int
	pxa2xx_pcm_mmap(struct snd_pcm_substream substream, struct vm_area_struct vma)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
	runtime->dma_area,
	runtime->dma_addr,
	runtime->dma_bytes);
	}

	static struct snd_pcm_ops pxa2xx_pcm_ops = {
	.open = pxa2xx_pcm_open,
	.close = pxa2xx_pcm_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = pxa2xx_pcm_hw_params,
	.hw_free = pxa2xx_pcm_hw_free,
	.prepare = pxa2xx_pcm_prepare,
	.trigger = pxa2xx_pcm_trigger,
	.pointer = pxa2xx_pcm_pointer,
	.mmap = pxa2xx_pcm_mmap,
	};

	static int pxa2xx_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 = pxa2xx_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_writecombine(pcm->card->dev, size,
	&buf->addr, GFP_KERNEL);
	if (!buf->area)
	return -ENOMEM;
	buf->bytes = size;
	return 0;
	}

	static void pxa2xx_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_writecombine(pcm->card->dev, buf->bytes,
	buf->area, buf->addr);
	buf->area = NULL;
	}
	}

	static u64 pxa2xx_pcm_dmamask = 0xffffffff;

	int pxa2xx_pcm_new(struct snd_card card, struct pxa2xx_pcm_client client,
	struct snd_pcm **rpcm)
	{
	struct snd_pcm *pcm;
	int play = client->playback_params ? 1 : 0;
	int capt = client->capture_params ? 1 : 0;
	int ret;

	ret = snd_pcm_new(card, "PXA2xx-PCM", 0, play, capt, &pcm);
	if (ret)
	goto out;

	pcm->private_data = client;
	pcm->private_free = pxa2xx_pcm_free_dma_buffers;

	if (!card->dev->dma_mask)
	card->dev->dma_mask = &pxa2xx_pcm_dmamask;
	if (!card->dev->coherent_dma_mask)
	card->dev->coherent_dma_mask = 0xffffffff;

	if (play) {
	int stream = SNDRV_PCM_STREAM_PLAYBACK;
	snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
	ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
	if (ret)
	goto out;
	}
	if (capt) {
	int stream = SNDRV_PCM_STREAM_CAPTURE;
	snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
	ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
	if (ret)
	goto out;
	}

	if (rpcm)
	*rpcm = pcm;
	ret = 0;

	out:
	return ret;
	}

	EXPORT_SYMBOL(pxa2xx_pcm_new);

	MODULE_AUTHOR("Nicolas Pitre");
	MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
	MODULE_LICENSE("GPL");