[mirror_ubuntu-jammy-kernel.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/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>

#include <asm/dma.h>
#include <mach/hardware.h>
#include <mach/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
2c484df0 TI	19	#include <sound/core.h>
	20	#include <sound/pcm.h>
	21	#include <sound/pcm_params.h>
	22
	23	#include <asm/dma.h>
a09e64fb RK	24	#include <mach/hardware.h>
a09e64fb RK	25	#include <mach/pxa-regs.h>
2c484df0 TI	26
	27	#include "pxa2xx-pcm.h"
	28
	29
d18f8376	30	static const struct snd_pcm_hardware pxa2xx_pcm_hardware = {
2c484df0 TI	31	.info = SNDRV_PCM_INFO_MMAP \|
	32	SNDRV_PCM_INFO_MMAP_VALID \|
	33	SNDRV_PCM_INFO_INTERLEAVED \|
	34	SNDRV_PCM_INFO_PAUSE,
	35	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	36	.period_bytes_min = 32,
	37	.period_bytes_max = 8192 - 32,
	38	.periods_min = 1,
	39	.periods_max = PAGE_SIZE/sizeof(pxa_dma_desc),
	40	.buffer_bytes_max = 128 * 1024,
	41	.fifo_size = 32,
	42	};
	43
	44	struct pxa2xx_runtime_data {
	45	int dma_ch;
d18f8376	46	struct pxa2xx_pcm_dma_params *params;
2c484df0 TI	47	pxa_dma_desc *dma_desc_array;
	48	dma_addr_t dma_desc_array_phys;
	49	};
	50
d18f8376 TI	51	static int pxa2xx_pcm_hw_params(struct snd_pcm_substream *substream,
d18f8376 TI	52	struct snd_pcm_hw_params *params)
2c484df0	53	{
d18f8376	54	struct snd_pcm_runtime *runtime = substream->runtime;
2c484df0 TI	55	struct pxa2xx_runtime_data *rtd = runtime->private_data;
	56	size_t totsize = params_buffer_bytes(params);
	57	size_t period = params_period_bytes(params);
	58	pxa_dma_desc *dma_desc;
	59	dma_addr_t dma_buff_phys, next_desc_phys;
	60
	61	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	62	runtime->dma_bytes = totsize;
	63
	64	dma_desc = rtd->dma_desc_array;
	65	next_desc_phys = rtd->dma_desc_array_phys;
	66	dma_buff_phys = runtime->dma_addr;
	67	do {
	68	next_desc_phys += sizeof(pxa_dma_desc);
	69	dma_desc->ddadr = next_desc_phys;
	70	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	71	dma_desc->dsadr = dma_buff_phys;
	72	dma_desc->dtadr = rtd->params->dev_addr;
	73	} else {
	74	dma_desc->dsadr = rtd->params->dev_addr;
	75	dma_desc->dtadr = dma_buff_phys;
	76	}
	77	if (period > totsize)
	78	period = totsize;
	79	dma_desc->dcmd = rtd->params->dcmd \| period \| DCMD_ENDIRQEN;
	80	dma_desc++;
	81	dma_buff_phys += period;
	82	} while (totsize -= period);
	83	dma_desc[-1].ddadr = rtd->dma_desc_array_phys;
	84
	85	return 0;
	86	}
	87
d18f8376	88	static int pxa2xx_pcm_hw_free(struct snd_pcm_substream *substream)
2c484df0 TI	89	{
	90	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
	91
	92	*rtd->params->drcmr = 0;
	93	snd_pcm_set_runtime_buffer(substream, NULL);
	94	return 0;
	95	}
	96
d18f8376	97	static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
2c484df0	98	{
d18f8376 TI	99	struct pxa2xx_pcm_client *client = substream->private_data;
d18f8376 TI	100	struct snd_pcm_runtime *runtime = substream->runtime;
2c484df0 TI	101	struct pxa2xx_runtime_data *rtd = runtime->private_data;
	102
	103	DCSR(rtd->dma_ch) &= ~DCSR_RUN;
	104	DCSR(rtd->dma_ch) = 0;
	105	DCMD(rtd->dma_ch) = 0;
	106	*rtd->params->drcmr = rtd->dma_ch \| DRCMR_MAPVLD;
	107
	108	return client->prepare(substream);
	109	}
	110
d18f8376	111	static int pxa2xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
2c484df0 TI	112	{
	113	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
	114	int ret = 0;
	115
	116	switch (cmd) {
	117	case SNDRV_PCM_TRIGGER_START:
	118	DDADR(rtd->dma_ch) = rtd->dma_desc_array_phys;
	119	DCSR(rtd->dma_ch) = DCSR_RUN;
	120	break;
	121
	122	case SNDRV_PCM_TRIGGER_STOP:
	123	case SNDRV_PCM_TRIGGER_SUSPEND:
	124	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	125	DCSR(rtd->dma_ch) &= ~DCSR_RUN;
	126	break;
	127
	128	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	129	DCSR(rtd->dma_ch) \|= DCSR_RUN;
	130	break;
	131
	132	default:
	133	ret = -EINVAL;
	134	}
	135
	136	return ret;
	137	}
	138
7d12e780	139	static void pxa2xx_pcm_dma_irq(int dma_ch, void *dev_id)
2c484df0	140	{
d18f8376	141	struct snd_pcm_substream *substream = dev_id;
2c484df0 TI	142	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
	143	int dcsr;
	144
	145	dcsr = DCSR(dma_ch);
	146	DCSR(dma_ch) = dcsr & ~DCSR_STOPIRQEN;
	147
	148	if (dcsr & DCSR_ENDINTR) {
	149	snd_pcm_period_elapsed(substream);
	150	} else {
	151	printk( KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
	152	rtd->params->name, dma_ch, dcsr );
	153	snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
	154	}
	155	}
	156
d18f8376	157	static snd_pcm_uframes_t pxa2xx_pcm_pointer(struct snd_pcm_substream *substream)
2c484df0	158	{
d18f8376	159	struct snd_pcm_runtime *runtime = substream->runtime;
2c484df0 TI	160	struct pxa2xx_runtime_data *rtd = runtime->private_data;
	161	dma_addr_t ptr = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
	162	DSADR(rtd->dma_ch) : DTADR(rtd->dma_ch);
	163	snd_pcm_uframes_t x = bytes_to_frames(runtime, ptr - runtime->dma_addr);
	164	if (x == runtime->buffer_size)
	165	x = 0;
	166	return x;
	167	}
	168
	169	static int
d18f8376	170	pxa2xx_pcm_hw_rule_mult32(struct snd_pcm_hw_params params, struct snd_pcm_hw_rule rule)
2c484df0	171	{
d18f8376	172	struct snd_interval *i = hw_param_interval(params, rule->var);
2c484df0 TI	173	int changed = 0;
	174
	175	if (i->min & 31) {
	176	i->min = (i->min & ~31) + 32;
	177	i->openmin = 0;
	178	changed = 1;
	179	}
	180
	181	if (i->max & 31) {
	182	i->max &= ~31;
	183	i->openmax = 0;
	184	changed = 1;
	185	}
	186
	187	return changed;
	188	}
	189
d18f8376	190	static int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
2c484df0	191	{
d18f8376 TI	192	struct pxa2xx_pcm_client *client = substream->private_data;
d18f8376 TI	193	struct snd_pcm_runtime *runtime = substream->runtime;
2c484df0 TI	194	struct pxa2xx_runtime_data *rtd;
	195	int ret;
	196
	197	runtime->hw = pxa2xx_pcm_hardware;
	198
	199	/*
	200	* For mysterious reasons (and despite what the manual says)
	201	* playback samples are lost if the DMA count is not a multiple
	202	* of the DMA burst size. Let's add a rule to enforce that.
	203	*/
	204	ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
	205	pxa2xx_pcm_hw_rule_mult32, NULL,
	206	SNDRV_PCM_HW_PARAM_PERIOD_BYTES, -1);
	207	if (ret)
	208	goto out;
	209	ret = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
	210	pxa2xx_pcm_hw_rule_mult32, NULL,
	211	SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
	212	if (ret)
	213	goto out;
	214
	215	ret = -ENOMEM;
	216	rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
	217	if (!rtd)
	218	goto out;
	219	rtd->dma_desc_array =
	220	dma_alloc_writecombine(substream->pcm->card->dev, PAGE_SIZE,
	221	&rtd->dma_desc_array_phys, GFP_KERNEL);
	222	if (!rtd->dma_desc_array)
	223	goto err1;
	224
	225	rtd->params = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
	226	client->playback_params : client->capture_params;
	227	ret = pxa_request_dma(rtd->params->name, DMA_PRIO_LOW,
	228	pxa2xx_pcm_dma_irq, substream);
	229	if (ret < 0)
	230	goto err2;
	231	rtd->dma_ch = ret;
	232
	233	runtime->private_data = rtd;
	234	ret = client->startup(substream);
	235	if (!ret)
	236	goto out;
	237
	238	pxa_free_dma(rtd->dma_ch);
	239	err2:
	240	dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
	241	rtd->dma_desc_array, rtd->dma_desc_array_phys);
	242	err1:
	243	kfree(rtd);
	244	out:
	245	return ret;
	246	}
	247
d18f8376	248	static int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
2c484df0	249	{
d18f8376	250	struct pxa2xx_pcm_client *client = substream->private_data;
2c484df0 TI	251	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
	252
	253	pxa_free_dma(rtd->dma_ch);
	254	client->shutdown(substream);
	255	dma_free_writecombine(substream->pcm->card->dev, PAGE_SIZE,
	256	rtd->dma_desc_array, rtd->dma_desc_array_phys);
	257	kfree(rtd);
	258	return 0;
	259	}
	260
	261	static int
d18f8376	262	pxa2xx_pcm_mmap(struct snd_pcm_substream substream, struct vm_area_struct vma)
2c484df0	263	{
d18f8376	264	struct snd_pcm_runtime *runtime = substream->runtime;
2c484df0 TI	265	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
	266	runtime->dma_area,
	267	runtime->dma_addr,
	268	runtime->dma_bytes);
	269	}
	270
d18f8376	271	static struct snd_pcm_ops pxa2xx_pcm_ops = {
2c484df0 TI	272	.open = pxa2xx_pcm_open,
	273	.close = pxa2xx_pcm_close,
	274	.ioctl = snd_pcm_lib_ioctl,
	275	.hw_params = pxa2xx_pcm_hw_params,
	276	.hw_free = pxa2xx_pcm_hw_free,
	277	.prepare = pxa2xx_pcm_prepare,
	278	.trigger = pxa2xx_pcm_trigger,
	279	.pointer = pxa2xx_pcm_pointer,
	280	.mmap = pxa2xx_pcm_mmap,
	281	};
	282
d18f8376	283	static int pxa2xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
2c484df0	284	{
d18f8376	285	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
2c484df0 TI	286	struct snd_dma_buffer *buf = &substream->dma_buffer;
	287	size_t size = pxa2xx_pcm_hardware.buffer_bytes_max;
	288	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	289	buf->dev.dev = pcm->card->dev;
	290	buf->private_data = NULL;
	291	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
	292	&buf->addr, GFP_KERNEL);
	293	if (!buf->area)
	294	return -ENOMEM;
	295	buf->bytes = size;
	296	return 0;
	297	}
	298
d18f8376	299	static void pxa2xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
2c484df0	300	{
d18f8376	301	struct snd_pcm_substream *substream;
2c484df0 TI	302	struct snd_dma_buffer *buf;
	303	int stream;
	304
	305	for (stream = 0; stream < 2; stream++) {
	306	substream = pcm->streams[stream].substream;
	307	if (!substream)
	308	continue;
	309	buf = &substream->dma_buffer;
	310	if (!buf->area)
	311	continue;
	312	dma_free_writecombine(pcm->card->dev, buf->bytes,
	313	buf->area, buf->addr);
	314	buf->area = NULL;
	315	}
	316	}
	317
	318	static u64 pxa2xx_pcm_dmamask = 0xffffffff;
	319
d18f8376 TI	320	int pxa2xx_pcm_new(struct snd_card card, struct pxa2xx_pcm_client client,
d18f8376 TI	321	struct snd_pcm **rpcm)
2c484df0	322	{
d18f8376	323	struct snd_pcm *pcm;
2c484df0 TI	324	int play = client->playback_params ? 1 : 0;
	325	int capt = client->capture_params ? 1 : 0;
	326	int ret;
	327
	328	ret = snd_pcm_new(card, "PXA2xx-PCM", 0, play, capt, &pcm);
	329	if (ret)
	330	goto out;
	331
	332	pcm->private_data = client;
	333	pcm->private_free = pxa2xx_pcm_free_dma_buffers;
	334
	335	if (!card->dev->dma_mask)
	336	card->dev->dma_mask = &pxa2xx_pcm_dmamask;
	337	if (!card->dev->coherent_dma_mask)
	338	card->dev->coherent_dma_mask = 0xffffffff;
	339
	340	if (play) {
	341	int stream = SNDRV_PCM_STREAM_PLAYBACK;
	342	snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
	343	ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
	344	if (ret)
	345	goto out;
	346	}
	347	if (capt) {
	348	int stream = SNDRV_PCM_STREAM_CAPTURE;
	349	snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
	350	ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
	351	if (ret)
	352	goto out;
	353	}
	354
	355	if (rpcm)
	356	*rpcm = pcm;
	357	ret = 0;
	358
	359	out:
	360	return ret;
	361	}
	362
	363	EXPORT_SYMBOL(pxa2xx_pcm_new);
	364
	365	MODULE_AUTHOR("Nicolas Pitre");
	366	MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
	367	MODULE_LICENSE("GPL");