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 <sound/core.h>
 14#include <sound/pxa2xx-lib.h>
 15
 16#include "pxa2xx-pcm.h"
 17
 18static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
 19{
 20	struct pxa2xx_pcm_client *client = substream->private_data;
 21
 22	__pxa2xx_pcm_prepare(substream);
 23
 24	return client->prepare(substream);
 25}
 26
 27static int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
 28{
 29	struct pxa2xx_pcm_client *client = substream->private_data;
 30	struct snd_pcm_runtime *runtime = substream->runtime;
 31	struct pxa2xx_runtime_data *rtd;
 32	int ret;
 33
 34	ret = __pxa2xx_pcm_open(substream);
 35	if (ret)
 36		goto out;
 37
 38	rtd = runtime->private_data;
 39
 40	rtd->params = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 41		      client->playback_params : client->capture_params;
 42	ret = pxa_request_dma(rtd->params->name, DMA_PRIO_LOW,
 43			      pxa2xx_pcm_dma_irq, substream);
 44	if (ret < 0)
 45		goto err2;
 46	rtd->dma_ch = ret;
 47
 48	ret = client->startup(substream);
 49	if (!ret)
 50		goto out;
 51
 52	pxa_free_dma(rtd->dma_ch);
 53 err2:
 54	__pxa2xx_pcm_close(substream);
 55 out:
 56	return ret;
 57}
 58
 59static int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
 60{
 61	struct pxa2xx_pcm_client *client = substream->private_data;
 62	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
 63
 64	pxa_free_dma(rtd->dma_ch);
 65	client->shutdown(substream);
 66
 67	return __pxa2xx_pcm_close(substream);
 68}
 69
 70static struct snd_pcm_ops pxa2xx_pcm_ops = {
 71	.open		= pxa2xx_pcm_open,
 72	.close		= pxa2xx_pcm_close,
 73	.ioctl		= snd_pcm_lib_ioctl,
 74	.hw_params	= __pxa2xx_pcm_hw_params,
 75	.hw_free	= __pxa2xx_pcm_hw_free,
 76	.prepare	= pxa2xx_pcm_prepare,
 77	.trigger	= pxa2xx_pcm_trigger,
 78	.pointer	= pxa2xx_pcm_pointer,
 79	.mmap		= pxa2xx_pcm_mmap,
 80};
 81
 82static u64 pxa2xx_pcm_dmamask = 0xffffffff;
 83
 84int pxa2xx_pcm_new(struct snd_card *card, struct pxa2xx_pcm_client *client,
 85		   struct snd_pcm **rpcm)
 86{
 87	struct snd_pcm *pcm;
 88	int play = client->playback_params ? 1 : 0;
 89	int capt = client->capture_params ? 1 : 0;
 90	int ret;
 91
 92	ret = snd_pcm_new(card, "PXA2xx-PCM", 0, play, capt, &pcm);
 93	if (ret)
 94		goto out;
 95
 96	pcm->private_data = client;
 97	pcm->private_free = pxa2xx_pcm_free_dma_buffers;
 98
 99	if (!card->dev->dma_mask)
100		card->dev->dma_mask = &pxa2xx_pcm_dmamask;
101	if (!card->dev->coherent_dma_mask)
102		card->dev->coherent_dma_mask = 0xffffffff;
103
104	if (play) {
105		int stream = SNDRV_PCM_STREAM_PLAYBACK;
106		snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
107		ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
108		if (ret)
109			goto out;
110	}
111	if (capt) {
112		int stream = SNDRV_PCM_STREAM_CAPTURE;
113		snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
114		ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
115		if (ret)
116			goto out;
117	}
118
119	if (rpcm)
120		*rpcm = pcm;
121	ret = 0;
122
123 out:
124	return ret;
125}
126
127EXPORT_SYMBOL(pxa2xx_pcm_new);
128
129MODULE_AUTHOR("Nicolas Pitre");
130MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
131MODULE_LICENSE("GPL");