[deliverable/linux.git] / sound / soc / pxa / pxa2xx-pcm.c

/*
 * 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/platform_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 <sound/soc.h>

#include <asm/dma.h>
#include <asm/hardware.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/audio.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 |
				  SNDRV_PCM_INFO_RESUME,
	.formats		= SNDRV_PCM_FMTBIT_S16_LE |
					SNDRV_PCM_FMTBIT_S24_LE |
					SNDRV_PCM_FMTBIT_S32_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 void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
{
	struct snd_pcm_substream *substream = dev_id;
	struct pxa2xx_runtime_data *prtd = 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",
			prtd->params->name, dma_ch, dcsr );
	}
}

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 *prtd = runtime->private_data;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct pxa2xx_pcm_dma_params *dma = rtd->dai->cpu_dai->dma_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;
	int ret;

	/* return if this is a bufferless transfer e.g.
	 * codec <--> BT codec or GSM modem -- lg FIXME */
	 if (!dma)
	 	return 0;

	/* this may get called several times by oss emulation
	 * with different params */
	if (prtd->params == NULL) {
		prtd->params = dma;
		ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
			      pxa2xx_pcm_dma_irq, substream);
		if (ret < 0)
			return ret;
		prtd->dma_ch = ret;
	} else if (prtd->params != dma) {
		pxa_free_dma(prtd->dma_ch);
		prtd->params = dma;
		ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
			      pxa2xx_pcm_dma_irq, substream);
		if (ret < 0)
			return ret;
		prtd->dma_ch = ret;
	}

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

	dma_desc = prtd->dma_desc_array;
	next_desc_phys = prtd->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 = prtd->params->dev_addr;
		} else {
			dma_desc->dsadr = prtd->params->dev_addr;
			dma_desc->dtadr = dma_buff_phys;
		}
		if (period > totsize)
			period = totsize;
		dma_desc->dcmd = prtd->params->dcmd | period | DCMD_ENDIRQEN;
		dma_desc++;
		dma_buff_phys += period;
	} while (totsize -= period);
	dma_desc[-1].ddadr = prtd->dma_desc_array_phys;

	return 0;
}

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

	if (prtd && prtd->params)
		*prtd->params->drcmr = 0;

	if (prtd->dma_ch) {
		snd_pcm_set_runtime_buffer(substream, NULL);
		pxa_free_dma(prtd->dma_ch);
		prtd->dma_ch = 0;
	}

	return 0;
}

static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;

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

	return 0;
}

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

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

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

	case SNDRV_PCM_TRIGGER_RESUME:
		DCSR(prtd->dma_ch) |= DCSR_RUN;
		break;
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
		DCSR(prtd->dma_ch) |= DCSR_RUN;
		break;

	default:
		ret = -EINVAL;
	}

	return ret;
}

static snd_pcm_uframes_t
pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct pxa2xx_runtime_data *prtd = runtime->private_data;

	dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
			 DSADR(prtd->dma_ch) : DTADR(prtd->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_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct pxa2xx_runtime_data *prtd;
	int ret;

	snd_soc_set_runtime_hwparams(substream, &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_constraint_step(runtime, 0,
		SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
	if (ret)
		goto out;

	ret = snd_pcm_hw_constraint_step(runtime, 0,
		SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
	if (ret)
		goto out;

	ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
	if (ret < 0)
		goto out;

	prtd = kzalloc(sizeof(struct pxa2xx_runtime_data), GFP_KERNEL);
	if (prtd == NULL) {
		ret = -ENOMEM;
		goto out;
	}

	prtd->dma_desc_array =
		dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
				       &prtd->dma_desc_array_phys, GFP_KERNEL);
	if (!prtd->dma_desc_array) {
		ret = -ENOMEM;
		goto err1;
	}

	runtime->private_data = prtd;
	return 0;

 err1:
	kfree(prtd);
 out:
	return ret;
}

static int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct pxa2xx_runtime_data *prtd = runtime->private_data;

	dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
			      prtd->dma_desc_array, prtd->dma_desc_array_phys);
	kfree(prtd);
	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);
}

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 = DMA_32BIT_MASK;

int pxa2xx_pcm_new(struct snd_card *card, struct snd_soc_codec_dai *dai,
	struct snd_pcm *pcm)
{
	int ret = 0;

	if (!card->dev->dma_mask)
		card->dev->dma_mask = &pxa2xx_pcm_dmamask;
	if (!card->dev->coherent_dma_mask)
		card->dev->coherent_dma_mask = DMA_32BIT_MASK;

	if (dai->playback.channels_min) {
		ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_PLAYBACK);
		if (ret)
			goto out;
	}

	if (dai->capture.channels_min) {
		ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
			SNDRV_PCM_STREAM_CAPTURE);
		if (ret)
			goto out;
	}
 out:
	return ret;
}

struct snd_soc_platform pxa2xx_soc_platform = {
	.name		= "pxa2xx-audio",
	.pcm_ops 	= &pxa2xx_pcm_ops,
	.pcm_new	= pxa2xx_pcm_new,
	.pcm_free	= pxa2xx_pcm_free_dma_buffers,
};

EXPORT_SYMBOL_GPL(pxa2xx_soc_platform);

MODULE_AUTHOR("Nicolas Pitre");
MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
MODULE_LICENSE("GPL");
Commit	Line	Data
f11a96d5 LG	1	/*
	2	* linux/sound/arm/pxa2xx-pcm.c -- ALSA PCM interface for the Intel PXA2xx chip
	3	*
	4	* Author: Nicolas Pitre
	5	* Created: Nov 30, 2004
	6	* Copyright: (C) 2004 MontaVista Software, Inc.
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/module.h>
	14	#include <linux/init.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/slab.h>
	17	#include <linux/dma-mapping.h>
	18
	19	#include <sound/driver.h>
	20	#include <sound/core.h>
	21	#include <sound/pcm.h>
	22	#include <sound/pcm_params.h>
	23	#include <sound/soc.h>
	24
	25	#include <asm/dma.h>
	26	#include <asm/hardware.h>
	27	#include <asm/arch/pxa-regs.h>
	28	#include <asm/arch/audio.h>
	29
	30	#include "pxa2xx-pcm.h"
	31
	32	static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
	33	.info = SNDRV_PCM_INFO_MMAP \|
	34	SNDRV_PCM_INFO_MMAP_VALID \|
	35	SNDRV_PCM_INFO_INTERLEAVED \|
	36	SNDRV_PCM_INFO_PAUSE \|
	37	SNDRV_PCM_INFO_RESUME,
	38	.formats = SNDRV_PCM_FMTBIT_S16_LE \|
	39	SNDRV_PCM_FMTBIT_S24_LE \|
	40	SNDRV_PCM_FMTBIT_S32_LE,
	41	.period_bytes_min = 32,
	42	.period_bytes_max = 8192 - 32,
	43	.periods_min = 1,
	44	.periods_max = PAGE_SIZE/sizeof(pxa_dma_desc),
	45	.buffer_bytes_max = 128 * 1024,
	46	.fifo_size = 32,
	47	};
	48
	49	struct pxa2xx_runtime_data {
	50	int dma_ch;
	51	struct pxa2xx_pcm_dma_params *params;
	52	pxa_dma_desc *dma_desc_array;
	53	dma_addr_t dma_desc_array_phys;
	54	};
	55
	56	static void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
	57	{
	58	struct snd_pcm_substream *substream = dev_id;
	59	struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
	60	int dcsr;
	61
	62	dcsr = DCSR(dma_ch);
	63	DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;
	64
65	if (dcsr & DCSR_ENDINTR) {
66	snd_pcm_period_elapsed(substream);
67	} else {
68	printk( KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
69	prtd->params->name, dma_ch, dcsr );
70	}
71	}
72
73	static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
74	struct snd_pcm_hw_params *params)
75	{
76	struct snd_pcm_runtime *runtime = substream->runtime;
77	struct pxa2xx_runtime_data *prtd = runtime->private_data;
78	struct snd_soc_pcm_runtime *rtd = substream->private_data;
a8f5d0a5	79	struct pxa2xx_pcm_dma_params *dma = rtd->dai->cpu_dai->dma_data;
f11a96d5 LG	80	size_t totsize = params_buffer_bytes(params);
	81	size_t period = params_period_bytes(params);
	82	pxa_dma_desc *dma_desc;
	83	dma_addr_t dma_buff_phys, next_desc_phys;
	84	int ret;
	85
a8f5d0a5 AJ	86	/* return if this is a bufferless transfer e.g.
	87	* codec <--> BT codec or GSM modem -- lg FIXME */
	88	if (!dma)
	89	return 0;
	90
f11a96d5 LG	91	/* this may get called several times by oss emulation
	92	* with different params */
	93	if (prtd->params == NULL) {
	94	prtd->params = dma;
	95	ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
	96	pxa2xx_pcm_dma_irq, substream);
	97	if (ret < 0)
	98	return ret;
	99	prtd->dma_ch = ret;
	100	} else if (prtd->params != dma) {
	101	pxa_free_dma(prtd->dma_ch);
	102	prtd->params = dma;
	103	ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
	104	pxa2xx_pcm_dma_irq, substream);
	105	if (ret < 0)
	106	return ret;
	107	prtd->dma_ch = ret;
	108	}
	109
	110	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	111	runtime->dma_bytes = totsize;
	112
	113	dma_desc = prtd->dma_desc_array;
	114	next_desc_phys = prtd->dma_desc_array_phys;
	115	dma_buff_phys = runtime->dma_addr;
	116	do {
	117	next_desc_phys += sizeof(pxa_dma_desc);
	118	dma_desc->ddadr = next_desc_phys;
	119	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	120	dma_desc->dsadr = dma_buff_phys;
	121	dma_desc->dtadr = prtd->params->dev_addr;
	122	} else {
	123	dma_desc->dsadr = prtd->params->dev_addr;
	124	dma_desc->dtadr = dma_buff_phys;
	125	}
	126	if (period > totsize)
	127	period = totsize;
	128	dma_desc->dcmd = prtd->params->dcmd \| period \| DCMD_ENDIRQEN;
	129	dma_desc++;
	130	dma_buff_phys += period;
	131	} while (totsize -= period);
	132	dma_desc[-1].ddadr = prtd->dma_desc_array_phys;
	133
	134	return 0;
	135	}
	136
	137	static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
	138	{
	139	struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
	140
	141	if (prtd && prtd->params)
	142	*prtd->params->drcmr = 0;
	143
	144	if (prtd->dma_ch) {
	145	snd_pcm_set_runtime_buffer(substream, NULL);
	146	pxa_free_dma(prtd->dma_ch);
	147	prtd->dma_ch = 0;
	148	}
	149
	150	return 0;
	151	}
	152
	153	static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
	154	{
155	struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
156
157	DCSR(prtd->dma_ch) &= ~DCSR_RUN;
158	DCSR(prtd->dma_ch) = 0;
159	DCMD(prtd->dma_ch) = 0;
160	*prtd->params->drcmr = prtd->dma_ch \| DRCMR_MAPVLD;
161
162	return 0;
163	}
164
165	static int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
166	{
167	struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
168	int ret = 0;
169
170	switch (cmd) {
171	case SNDRV_PCM_TRIGGER_START:
172	DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
173	DCSR(prtd->dma_ch) = DCSR_RUN;
174	break;
175
176	case SNDRV_PCM_TRIGGER_STOP:
177	case SNDRV_PCM_TRIGGER_SUSPEND:
178	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
179	DCSR(prtd->dma_ch) &= ~DCSR_RUN;
180	break;
181
182	case SNDRV_PCM_TRIGGER_RESUME:
183	DCSR(prtd->dma_ch) \|= DCSR_RUN;
184	break;
185	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
186	DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
187	DCSR(prtd->dma_ch) \|= DCSR_RUN;
188	break;
189
190	default:
191	ret = -EINVAL;
192	}
193
194	return ret;
195	}
196
197	static snd_pcm_uframes_t
198	pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
199	{
200	struct snd_pcm_runtime *runtime = substream->runtime;
201	struct pxa2xx_runtime_data *prtd = runtime->private_data;
202
203	dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
204	DSADR(prtd->dma_ch) : DTADR(prtd->dma_ch);
205	snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);
206
207	if (x == runtime->buffer_size)
208	x = 0;
209	return x;
210	}
211
212	static int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
213	{
214	struct snd_pcm_runtime *runtime = substream->runtime;
215	struct pxa2xx_runtime_data *prtd;
216	int ret;
217
218	snd_soc_set_runtime_hwparams(substream, &pxa2xx_pcm_hardware);
219
220	/*
221	* For mysterious reasons (and despite what the manual says)
222	* playback samples are lost if the DMA count is not a multiple
223	* of the DMA burst size. Let's add a rule to enforce that.
224	*/
225	ret = snd_pcm_hw_constraint_step(runtime, 0,
226	SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
227	if (ret)
228	goto out;
229
230	ret = snd_pcm_hw_constraint_step(runtime, 0,
231	SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
232	if (ret)
233	goto out;
234
a8f5d0a5 AJ	235	ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
	236	if (ret < 0)
	237	goto out;
	238
f11a96d5 LG	239	prtd = kzalloc(sizeof(struct pxa2xx_runtime_data), GFP_KERNEL);
	240	if (prtd == NULL) {
	241	ret = -ENOMEM;
	242	goto out;
	243	}
	244
	245	prtd->dma_desc_array =
	246	dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
	247	&prtd->dma_desc_array_phys, GFP_KERNEL);
	248	if (!prtd->dma_desc_array) {
	249	ret = -ENOMEM;
	250	goto err1;
	251	}
	252
	253	runtime->private_data = prtd;
	254	return 0;
	255
	256	err1:
	257	kfree(prtd);
	258	out:
	259	return ret;
	260	}
	261
	262	static int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
	263	{
	264	struct snd_pcm_runtime *runtime = substream->runtime;
	265	struct pxa2xx_runtime_data *prtd = runtime->private_data;
	266
	267	dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
	268	prtd->dma_desc_array, prtd->dma_desc_array_phys);
	269	kfree(prtd);
	270	return 0;
	271	}
	272
	273	static int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
	274	struct vm_area_struct *vma)
	275	{
	276	struct snd_pcm_runtime *runtime = substream->runtime;
	277	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
	278	runtime->dma_area,
	279	runtime->dma_addr,
	280	runtime->dma_bytes);
	281	}
	282
	283	struct snd_pcm_ops pxa2xx_pcm_ops = {
	284	.open = pxa2xx_pcm_open,
	285	.close = pxa2xx_pcm_close,
	286	.ioctl = snd_pcm_lib_ioctl,
	287	.hw_params = pxa2xx_pcm_hw_params,
	288	.hw_free = pxa2xx_pcm_hw_free,
	289	.prepare = pxa2xx_pcm_prepare,
	290	.trigger = pxa2xx_pcm_trigger,
	291	.pointer = pxa2xx_pcm_pointer,
	292	.mmap = pxa2xx_pcm_mmap,
	293	};
	294
	295	static int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
	296	{
	297	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	298	struct snd_dma_buffer *buf = &substream->dma_buffer;
	299	size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
	300	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	301	buf->dev.dev = pcm->card->dev;
	302	buf->private_data = NULL;
303	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
304	&buf->addr, GFP_KERNEL);
305	if (!buf->area)
306	return -ENOMEM;
307	buf->bytes = size;
308	return 0;
309	}
310
311	static void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
312	{
313	struct snd_pcm_substream *substream;
314	struct snd_dma_buffer *buf;
315	int stream;
316
317	for (stream = 0; stream < 2; stream++) {
318	substream = pcm->streams[stream].substream;
319	if (!substream)
320	continue;
321
322	buf = &substream->dma_buffer;
323	if (!buf->area)
324	continue;
325
326	dma_free_writecombine(pcm->card->dev, buf->bytes,
327	buf->area, buf->addr);
328	buf->area = NULL;
329	}
330	}
331
332	static u64 pxa2xx_pcm_dmamask = DMA_32BIT_MASK;
333
334	int pxa2xx_pcm_new(struct snd_card card, struct snd_soc_codec_dai dai,
335	struct snd_pcm *pcm)
336	{
337	int ret = 0;
338
339	if (!card->dev->dma_mask)
340	card->dev->dma_mask = &pxa2xx_pcm_dmamask;
341	if (!card->dev->coherent_dma_mask)
342	card->dev->coherent_dma_mask = DMA_32BIT_MASK;
343
344	if (dai->playback.channels_min) {
345	ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
346	SNDRV_PCM_STREAM_PLAYBACK);
347	if (ret)
348	goto out;
349	}
350
351	if (dai->capture.channels_min) {
352	ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
353	SNDRV_PCM_STREAM_CAPTURE);
354	if (ret)
355	goto out;
356	}
357	out:
358	return ret;
359	}
360
361	struct snd_soc_platform pxa2xx_soc_platform = {
362	.name = "pxa2xx-audio",
363	.pcm_ops = &pxa2xx_pcm_ops,
364	.pcm_new = pxa2xx_pcm_new,
365	.pcm_free = pxa2xx_pcm_free_dma_buffers,
366	};
367
368	EXPORT_SYMBOL_GPL(pxa2xx_soc_platform);
369
370	MODULE_AUTHOR("Nicolas Pitre");
371	MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
372	MODULE_LICENSE("GPL");