[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/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#include <asm/dma.h>
#include <mach/hardware.h>
#include <mach/pxa-regs.h>
#include <mach/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_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
f11a96d5 LG	19	#include <sound/core.h>
	20	#include <sound/pcm.h>
	21	#include <sound/pcm_params.h>
	22	#include <sound/soc.h>
	23
	24	#include <asm/dma.h>
a09e64fb RK	25	#include <mach/hardware.h>
	26	#include <mach/pxa-regs.h>
	27	#include <mach/audio.h>
f11a96d5 LG	28
	29	#include "pxa2xx-pcm.h"
	30
	31	static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
	32	.info = SNDRV_PCM_INFO_MMAP \|
	33	SNDRV_PCM_INFO_MMAP_VALID \|
	34	SNDRV_PCM_INFO_INTERLEAVED \|
	35	SNDRV_PCM_INFO_PAUSE \|
	36	SNDRV_PCM_INFO_RESUME,
	37	.formats = SNDRV_PCM_FMTBIT_S16_LE \|
	38	SNDRV_PCM_FMTBIT_S24_LE \|
	39	SNDRV_PCM_FMTBIT_S32_LE,
	40	.period_bytes_min = 32,
	41	.period_bytes_max = 8192 - 32,
	42	.periods_min = 1,
	43	.periods_max = PAGE_SIZE/sizeof(pxa_dma_desc),
	44	.buffer_bytes_max = 128 * 1024,
	45	.fifo_size = 32,
	46	};
	47
	48	struct pxa2xx_runtime_data {
	49	int dma_ch;
	50	struct pxa2xx_pcm_dma_params *params;
	51	pxa_dma_desc *dma_desc_array;
	52	dma_addr_t dma_desc_array_phys;
	53	};
	54
	55	static void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
	56	{
	57	struct snd_pcm_substream *substream = dev_id;
	58	struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
	59	int dcsr;
	60
	61	dcsr = DCSR(dma_ch);
	62	DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;
	63
	64	if (dcsr & DCSR_ENDINTR) {
	65	snd_pcm_period_elapsed(substream);
	66	} else {
b32432e3 MB	67	printk(KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
b32432e3 MB	68	prtd->params->name, dma_ch, dcsr);
f11a96d5 LG	69	}
	70	}
	71
	72	static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
	73	struct snd_pcm_hw_params *params)
	74	{
	75	struct snd_pcm_runtime *runtime = substream->runtime;
	76	struct pxa2xx_runtime_data *prtd = runtime->private_data;
	77	struct snd_soc_pcm_runtime *rtd = substream->private_data;
a8f5d0a5	78	struct pxa2xx_pcm_dma_params *dma = rtd->dai->cpu_dai->dma_data;
f11a96d5 LG	79	size_t totsize = params_buffer_bytes(params);
	80	size_t period = params_period_bytes(params);
	81	pxa_dma_desc *dma_desc;
	82	dma_addr_t dma_buff_phys, next_desc_phys;
	83	int ret;
	84
a8f5d0a5 AJ	85	/* return if this is a bufferless transfer e.g.
a8f5d0a5 AJ	86	* codec <--> BT codec or GSM modem -- lg FIXME */
b32432e3 MB	87	if (!dma)
b32432e3 MB	88	return 0;
a8f5d0a5	89
f11a96d5 LG	90	/* this may get called several times by oss emulation
	91	* with different params */
	92	if (prtd->params == NULL) {
	93	prtd->params = dma;
	94	ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
	95	pxa2xx_pcm_dma_irq, substream);
	96	if (ret < 0)
	97	return ret;
	98	prtd->dma_ch = ret;
	99	} else if (prtd->params != dma) {
	100	pxa_free_dma(prtd->dma_ch);
	101	prtd->params = dma;
	102	ret = pxa_request_dma(prtd->params->name, DMA_PRIO_LOW,
	103	pxa2xx_pcm_dma_irq, substream);
	104	if (ret < 0)
	105	return ret;
	106	prtd->dma_ch = ret;
	107	}
	108
	109	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	110	runtime->dma_bytes = totsize;
	111
	112	dma_desc = prtd->dma_desc_array;
	113	next_desc_phys = prtd->dma_desc_array_phys;
	114	dma_buff_phys = runtime->dma_addr;
	115	do {
	116	next_desc_phys += sizeof(pxa_dma_desc);
	117	dma_desc->ddadr = next_desc_phys;
	118	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	119	dma_desc->dsadr = dma_buff_phys;
	120	dma_desc->dtadr = prtd->params->dev_addr;
	121	} else {
	122	dma_desc->dsadr = prtd->params->dev_addr;
	123	dma_desc->dtadr = dma_buff_phys;
	124	}
	125	if (period > totsize)
	126	period = totsize;
	127	dma_desc->dcmd = prtd->params->dcmd \| period \| DCMD_ENDIRQEN;
	128	dma_desc++;
	129	dma_buff_phys += period;
	130	} while (totsize -= period);
	131	dma_desc[-1].ddadr = prtd->dma_desc_array_phys;
	132
	133	return 0;
	134	}
	135
	136	static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
	137	{
	138	struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
	139
	140	if (prtd && prtd->params)
	141	*prtd->params->drcmr = 0;
	142
	143	if (prtd->dma_ch) {
	144	snd_pcm_set_runtime_buffer(substream, NULL);
	145	pxa_free_dma(prtd->dma_ch);
	146	prtd->dma_ch = 0;
	147	}
	148
	149	return 0;
	150	}
	151
	152	static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
	153	{
154	struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
155
156	DCSR(prtd->dma_ch) &= ~DCSR_RUN;
157	DCSR(prtd->dma_ch) = 0;
158	DCMD(prtd->dma_ch) = 0;
159	*prtd->params->drcmr = prtd->dma_ch \| DRCMR_MAPVLD;
160
161	return 0;
162	}
163
164	static int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
165	{
166	struct pxa2xx_runtime_data *prtd = substream->runtime->private_data;
167	int ret = 0;
168
169	switch (cmd) {
170	case SNDRV_PCM_TRIGGER_START:
171	DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
172	DCSR(prtd->dma_ch) = DCSR_RUN;
173	break;
174
175	case SNDRV_PCM_TRIGGER_STOP:
176	case SNDRV_PCM_TRIGGER_SUSPEND:
177	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
178	DCSR(prtd->dma_ch) &= ~DCSR_RUN;
179	break;
180
181	case SNDRV_PCM_TRIGGER_RESUME:
182	DCSR(prtd->dma_ch) \|= DCSR_RUN;
183	break;
184	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
185	DDADR(prtd->dma_ch) = prtd->dma_desc_array_phys;
186	DCSR(prtd->dma_ch) \|= DCSR_RUN;
187	break;
188
189	default:
190	ret = -EINVAL;
191	}
192
193	return ret;
194	}
195
196	static snd_pcm_uframes_t
197	pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
198	{
199	struct snd_pcm_runtime *runtime = substream->runtime;
200	struct pxa2xx_runtime_data *prtd = runtime->private_data;
201
202	dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
203	DSADR(prtd->dma_ch) : DTADR(prtd->dma_ch);
204	snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);
205
206	if (x == runtime->buffer_size)
207	x = 0;
208	return x;
209	}
210
211	static int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
212	{
213	struct snd_pcm_runtime *runtime = substream->runtime;
214	struct pxa2xx_runtime_data *prtd;
215	int ret;
216
217	snd_soc_set_runtime_hwparams(substream, &pxa2xx_pcm_hardware);
218
219	/*
220	* For mysterious reasons (and despite what the manual says)
221	* playback samples are lost if the DMA count is not a multiple
222	* of the DMA burst size. Let's add a rule to enforce that.
223	*/
224	ret = snd_pcm_hw_constraint_step(runtime, 0,
225	SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
226	if (ret)
227	goto out;
228
229	ret = snd_pcm_hw_constraint_step(runtime, 0,
230	SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
231	if (ret)
232	goto out;
233
a8f5d0a5 AJ	234	ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
	235	if (ret < 0)
	236	goto out;
	237
f11a96d5 LG	238	prtd = kzalloc(sizeof(struct pxa2xx_runtime_data), GFP_KERNEL);
	239	if (prtd == NULL) {
	240	ret = -ENOMEM;
	241	goto out;
	242	}
	243
	244	prtd->dma_desc_array =
	245	dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
	246	&prtd->dma_desc_array_phys, GFP_KERNEL);
	247	if (!prtd->dma_desc_array) {
	248	ret = -ENOMEM;
	249	goto err1;
	250	}
	251
	252	runtime->private_data = prtd;
	253	return 0;
	254
	255	err1:
	256	kfree(prtd);
	257	out:
	258	return ret;
	259	}
	260
	261	static int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
	262	{
	263	struct snd_pcm_runtime *runtime = substream->runtime;
	264	struct pxa2xx_runtime_data *prtd = runtime->private_data;
	265
	266	dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
	267	prtd->dma_desc_array, prtd->dma_desc_array_phys);
	268	kfree(prtd);
	269	return 0;
	270	}
	271
	272	static int pxa2xx_pcm_mmap(struct snd_pcm_substream *substream,
	273	struct vm_area_struct *vma)
	274	{
	275	struct snd_pcm_runtime *runtime = substream->runtime;
	276	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
	277	runtime->dma_area,
	278	runtime->dma_addr,
	279	runtime->dma_bytes);
	280	}
	281
	282	struct snd_pcm_ops pxa2xx_pcm_ops = {
	283	.open = pxa2xx_pcm_open,
	284	.close = pxa2xx_pcm_close,
	285	.ioctl = snd_pcm_lib_ioctl,
	286	.hw_params = pxa2xx_pcm_hw_params,
	287	.hw_free = pxa2xx_pcm_hw_free,
	288	.prepare = pxa2xx_pcm_prepare,
	289	.trigger = pxa2xx_pcm_trigger,
	290	.pointer = pxa2xx_pcm_pointer,
	291	.mmap = pxa2xx_pcm_mmap,
	292	};
	293
	294	static int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
	295	{
	296	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	297	struct snd_dma_buffer *buf = &substream->dma_buffer;
	298	size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
	299	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	300	buf->dev.dev = pcm->card->dev;
	301	buf->private_data = NULL;
302	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
303	&buf->addr, GFP_KERNEL);
304	if (!buf->area)
305	return -ENOMEM;
306	buf->bytes = size;
307	return 0;
308	}
309
310	static void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
311	{
312	struct snd_pcm_substream *substream;
313	struct snd_dma_buffer *buf;
314	int stream;
315
316	for (stream = 0; stream < 2; stream++) {
317	substream = pcm->streams[stream].substream;
318	if (!substream)
319	continue;
320
321	buf = &substream->dma_buffer;
322	if (!buf->area)
323	continue;
324
325	dma_free_writecombine(pcm->card->dev, buf->bytes,
326	buf->area, buf->addr);
327	buf->area = NULL;
328	}
329	}
330
331	static u64 pxa2xx_pcm_dmamask = DMA_32BIT_MASK;
332
917f93ac	333	int pxa2xx_pcm_new(struct snd_card card, struct snd_soc_dai dai,
f11a96d5 LG	334	struct snd_pcm *pcm)
	335	{
	336	int ret = 0;
	337
	338	if (!card->dev->dma_mask)
	339	card->dev->dma_mask = &pxa2xx_pcm_dmamask;
	340	if (!card->dev->coherent_dma_mask)
	341	card->dev->coherent_dma_mask = DMA_32BIT_MASK;
	342
	343	if (dai->playback.channels_min) {
	344	ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
	345	SNDRV_PCM_STREAM_PLAYBACK);
	346	if (ret)
	347	goto out;
	348	}
	349
	350	if (dai->capture.channels_min) {
	351	ret = pxa2xx_pcm_preallocate_dma_buffer(pcm,
	352	SNDRV_PCM_STREAM_CAPTURE);
	353	if (ret)
	354	goto out;
	355	}
	356	out:
	357	return ret;
	358	}
	359
	360	struct snd_soc_platform pxa2xx_soc_platform = {
	361	.name = "pxa2xx-audio",
	362	.pcm_ops = &pxa2xx_pcm_ops,
	363	.pcm_new = pxa2xx_pcm_new,
	364	.pcm_free = pxa2xx_pcm_free_dma_buffers,
	365	};
f11a96d5 LG	366	EXPORT_SYMBOL_GPL(pxa2xx_soc_platform);
	367
	368	MODULE_AUTHOR("Nicolas Pitre");
	369	MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
	370	MODULE_LICENSE("GPL");