[linux-block.git] / sound / arm / 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/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");
Commit	Line	Data
2c484df0 TI	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/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
	24	#include <asm/dma.h>
	25	#include <asm/hardware.h>
	26	#include <asm/arch/pxa-regs.h>
	27
	28	#include "pxa2xx-pcm.h"
	29
	30
d18f8376	31	static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
2c484df0 TI	32	.info = SNDRV_PCM_INFO_MMAP \|
	33	SNDRV_PCM_INFO_MMAP_VALID \|
	34	SNDRV_PCM_INFO_INTERLEAVED \|
	35	SNDRV_PCM_INFO_PAUSE,
	36	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	37	.period_bytes_min = 32,
	38	.period_bytes_max = 8192 - 32,
	39	.periods_min = 1,
	40	.periods_max = PAGE_SIZE/sizeof(pxa_dma_desc),
	41	.buffer_bytes_max = 128 * 1024,
	42	.fifo_size = 32,
	43	};
	44
	45	struct pxa2xx_runtime_data {
	46	int dma_ch;
d18f8376	47	struct pxa2xx_pcm_dma_params *params;
2c484df0 TI	48	pxa_dma_desc *dma_desc_array;
	49	dma_addr_t dma_desc_array_phys;
	50	};
	51
d18f8376 TI	52	static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
d18f8376 TI	53	struct snd_pcm_hw_params *params)
2c484df0	54	{
d18f8376	55	struct snd_pcm_runtime *runtime = substream->runtime;
2c484df0 TI	56	struct pxa2xx_runtime_data *rtd = runtime->private_data;
	57	size_t totsize = params_buffer_bytes(params);
	58	size_t period = params_period_bytes(params);
	59	pxa_dma_desc *dma_desc;
	60	dma_addr_t dma_buff_phys, next_desc_phys;
	61
	62	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	63	runtime->dma_bytes = totsize;
	64
	65	dma_desc = rtd->dma_desc_array;
	66	next_desc_phys = rtd->dma_desc_array_phys;
	67	dma_buff_phys = runtime->dma_addr;
	68	do {
	69	next_desc_phys += sizeof(pxa_dma_desc);
	70	dma_desc->ddadr = next_desc_phys;
	71	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	72	dma_desc->dsadr = dma_buff_phys;
	73	dma_desc->dtadr = rtd->params->dev_addr;
	74	} else {
	75	dma_desc->dsadr = rtd->params->dev_addr;
	76	dma_desc->dtadr = dma_buff_phys;
	77	}
	78	if (period > totsize)
	79	period = totsize;
	80	dma_desc->dcmd = rtd->params->dcmd \| period \| DCMD_ENDIRQEN;
	81	dma_desc++;
	82	dma_buff_phys += period;
	83	} while (totsize -= period);
	84	dma_desc[-1].ddadr = rtd->dma_desc_array_phys;
	85
	86	return 0;
	87	}
	88
d18f8376	89	static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
2c484df0 TI	90	{
	91	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
	92
	93	*rtd->params->drcmr = 0;
	94	snd_pcm_set_runtime_buffer(substream, NULL);
	95	return 0;
	96	}
	97
d18f8376	98	static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
2c484df0	99	{
d18f8376 TI	100	struct pxa2xx_pcm_client *client = substream->private_data;
d18f8376 TI	101	struct snd_pcm_runtime *runtime = substream->runtime;
2c484df0 TI	102	struct pxa2xx_runtime_data *rtd = runtime->private_data;
	103
	104	DCSR(rtd->dma_ch) &= ~DCSR_RUN;
	105	DCSR(rtd->dma_ch) = 0;
	106	DCMD(rtd->dma_ch) = 0;
	107	*rtd->params->drcmr = rtd->dma_ch \| DRCMR_MAPVLD;
	108
	109	return client->prepare(substream);
	110	}
	111
d18f8376	112	static int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
2c484df0 TI	113	{
	114	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
	115	int ret = 0;
	116
	117	switch (cmd) {
	118	case SNDRV_PCM_TRIGGER_START:
	119	DDADR(rtd->dma_ch) = rtd->dma_desc_array_phys;
	120	DCSR(rtd->dma_ch) = DCSR_RUN;
	121	break;
	122
	123	case SNDRV_PCM_TRIGGER_STOP:
	124	case SNDRV_PCM_TRIGGER_SUSPEND:
	125	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	126	DCSR(rtd->dma_ch) &= ~DCSR_RUN;
	127	break;
	128
	129	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	130	DCSR(rtd->dma_ch) \|= DCSR_RUN;
	131	break;
	132
	133	default:
	134	ret = -EINVAL;
	135	}
	136
	137	return ret;
	138	}
	139
7d12e780	140	static void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
2c484df0	141	{
d18f8376	142	struct snd_pcm_substream *substream = dev_id;
2c484df0 TI	143	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
	144	int dcsr;
	145
	146	dcsr = DCSR(dma_ch);
	147	DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;
	148
	149	if (dcsr & DCSR_ENDINTR) {
	150	snd_pcm_period_elapsed(substream);
	151	} else {
	152	printk( KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
	153	rtd->params->name, dma_ch, dcsr );
	154	snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
	155	}
	156	}
	157
d18f8376	158	static snd_pcm_uframes_t pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
2c484df0	159	{
d18f8376	160	struct snd_pcm_runtime *runtime = substream->runtime;
2c484df0 TI	161	struct pxa2xx_runtime_data *rtd = runtime->private_data;
	162	dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
	163	DSADR(rtd->dma_ch) : DTADR(rtd->dma_ch);
	164	snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);
	165	if (x == runtime->buffer_size)
	166	x = 0;
	167	return x;
	168	}
	169
	170	static int
d18f8376	171	pxa2xx_pcm_hw_rule_mult32(struct snd_pcm_hw_params params, struct snd_pcm_hw_rule rule)
2c484df0	172	{
d18f8376	173	struct snd_interval *i = hw_param_interval(params, rule->var);
2c484df0 TI	174	int changed = 0;
	175
	176	if (i->min & 31) {
	177	i->min = (i->min & ~31) + 32;
	178	i->openmin = 0;
	179	changed = 1;
	180	}
	181
	182	if (i->max & 31) {
	183	i->max &= ~31;
	184	i->openmax = 0;
	185	changed = 1;
	186	}
	187
	188	return changed;
	189	}
	190
d18f8376	191	static int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
2c484df0	192	{
d18f8376 TI	193	struct pxa2xx_pcm_client *client = substream->private_data;
d18f8376 TI	194	struct snd_pcm_runtime *runtime = substream->runtime;
2c484df0 TI	195	struct pxa2xx_runtime_data *rtd;
	196	int ret;
	197
	198	runtime->hw = pxa2xx_pcm_hardware;
	199
	200	/*
	201	* For mysterious reasons (and despite what the manual says)
	202	* playback samples are lost if the DMA count is not a multiple
	203	* of the DMA burst size. Let's add a rule to enforce that.
	204	*/
	205	ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
	206	pxa2xx_pcm_hw_rule_mult32, NULL,
	207	SNDRV_PCM_HW_PARAM_PERIOD_BYTES, -1);
	208	if (ret)
	209	goto out;
	210	ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
	211	pxa2xx_pcm_hw_rule_mult32, NULL,
	212	SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
	213	if (ret)
	214	goto out;
	215
	216	ret = -ENOMEM;
	217	rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
	218	if (!rtd)
	219	goto out;
	220	rtd->dma_desc_array =
	221	dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
	222	&rtd->dma_desc_array_phys, GFP_KERNEL);
	223	if (!rtd->dma_desc_array)
	224	goto err1;
	225
	226	rtd->params = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
	227	client->playback_params : client->capture_params;
	228	ret = pxa_request_dma(rtd->params->name, DMA_PRIO_LOW,
	229	pxa2xx_pcm_dma_irq, substream);
	230	if (ret < 0)
	231	goto err2;
	232	rtd->dma_ch = ret;
	233
	234	runtime->private_data = rtd;
	235	ret = client->startup(substream);
	236	if (!ret)
	237	goto out;
	238
	239	pxa_free_dma(rtd->dma_ch);
	240	err2:
	241	dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
	242	rtd->dma_desc_array, rtd->dma_desc_array_phys);
	243	err1:
	244	kfree(rtd);
	245	out:
	246	return ret;
	247	}
	248
d18f8376	249	static int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
2c484df0	250	{
d18f8376	251	struct pxa2xx_pcm_client *client = substream->private_data;
2c484df0 TI	252	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
	253
	254	pxa_free_dma(rtd->dma_ch);
	255	client->shutdown(substream);
	256	dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
	257	rtd->dma_desc_array, rtd->dma_desc_array_phys);
	258	kfree(rtd);
	259	return 0;
	260	}
	261
	262	static int
d18f8376	263	pxa2xx_pcm_mmap(struct snd_pcm_substream substream, struct vm_area_struct vma)
2c484df0	264	{
d18f8376	265	struct snd_pcm_runtime *runtime = substream->runtime;
2c484df0 TI	266	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
	267	runtime->dma_area,
	268	runtime->dma_addr,
	269	runtime->dma_bytes);
	270	}
	271
d18f8376	272	static struct snd_pcm_ops pxa2xx_pcm_ops = {
2c484df0 TI	273	.open = pxa2xx_pcm_open,
	274	.close = pxa2xx_pcm_close,
	275	.ioctl = snd_pcm_lib_ioctl,
	276	.hw_params = pxa2xx_pcm_hw_params,
	277	.hw_free = pxa2xx_pcm_hw_free,
	278	.prepare = pxa2xx_pcm_prepare,
	279	.trigger = pxa2xx_pcm_trigger,
	280	.pointer = pxa2xx_pcm_pointer,
	281	.mmap = pxa2xx_pcm_mmap,
	282	};
	283
d18f8376	284	static int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
2c484df0	285	{
d18f8376	286	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
2c484df0 TI	287	struct snd_dma_buffer *buf = &substream->dma_buffer;
	288	size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
	289	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	290	buf->dev.dev = pcm->card->dev;
	291	buf->private_data = NULL;
	292	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
	293	&buf->addr, GFP_KERNEL);
	294	if (!buf->area)
	295	return -ENOMEM;
	296	buf->bytes = size;
	297	return 0;
	298	}
	299
d18f8376	300	static void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
2c484df0	301	{
d18f8376	302	struct snd_pcm_substream *substream;
2c484df0 TI	303	struct snd_dma_buffer *buf;
	304	int stream;
	305
	306	for (stream = 0; stream < 2; stream++) {
	307	substream = pcm->streams[stream].substream;
	308	if (!substream)
	309	continue;
	310	buf = &substream->dma_buffer;
	311	if (!buf->area)
	312	continue;
	313	dma_free_writecombine(pcm->card->dev, buf->bytes,
	314	buf->area, buf->addr);
	315	buf->area = NULL;
	316	}
	317	}
	318
	319	static u64 pxa2xx_pcm_dmamask = 0xffffffff;
	320
d18f8376 TI	321	int pxa2xx_pcm_new(struct snd_card card, struct pxa2xx_pcm_client client,
d18f8376 TI	322	struct snd_pcm **rpcm)
2c484df0	323	{
d18f8376	324	struct snd_pcm *pcm;
2c484df0 TI	325	int play = client->playback_params ? 1 : 0;
	326	int capt = client->capture_params ? 1 : 0;
	327	int ret;
	328
	329	ret = snd_pcm_new(card, "PXA2xx-PCM", 0, play, capt, &pcm);
	330	if (ret)
	331	goto out;
	332
	333	pcm->private_data = client;
	334	pcm->private_free = pxa2xx_pcm_free_dma_buffers;
	335
	336	if (!card->dev->dma_mask)
	337	card->dev->dma_mask = &pxa2xx_pcm_dmamask;
	338	if (!card->dev->coherent_dma_mask)
	339	card->dev->coherent_dma_mask = 0xffffffff;
	340
	341	if (play) {
	342	int stream = SNDRV_PCM_STREAM_PLAYBACK;
	343	snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
	344	ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
	345	if (ret)
	346	goto out;
	347	}
	348	if (capt) {
	349	int stream = SNDRV_PCM_STREAM_CAPTURE;
	350	snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
	351	ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
	352	if (ret)
	353	goto out;
	354	}
	355
	356	if (rpcm)
	357	*rpcm = pcm;
	358	ret = 0;
	359
	360	out:
	361	return ret;
	362	}
	363
	364	EXPORT_SYMBOL(pxa2xx_pcm_new);
	365
	366	MODULE_AUTHOR("Nicolas Pitre");
	367	MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
	368	MODULE_LICENSE("GPL");