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/dma-mapping.h>
15#include <linux/dmaengine.h>
16
17#include <mach/dma.h>
18
19#include <sound/core.h>
20#include <sound/pxa2xx-lib.h>
21#include <sound/dmaengine_pcm.h>
22
23#include "pxa2xx-pcm.h"
24
25static int pxa2xx_pcm_prepare(struct snd_pcm_substream *substream)
26{
27	struct pxa2xx_pcm_client *client = substream->private_data;
28
29	__pxa2xx_pcm_prepare(substream);
30
31	return client->prepare(substream);
32}
33
34static int pxa2xx_pcm_open(struct snd_pcm_substream *substream)
35{
36	struct pxa2xx_pcm_client *client = substream->private_data;
37	struct snd_pcm_runtime *runtime = substream->runtime;
38	struct pxa2xx_runtime_data *rtd;
39	int ret;
40
41	ret = __pxa2xx_pcm_open(substream);
42	if (ret)
43		goto out;
44
45	rtd = runtime->private_data;
46
47	rtd->params = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
48		      client->playback_params : client->capture_params;
49	ret = pxa_request_dma("dma", DMA_PRIO_LOW,
50			      pxa2xx_pcm_dma_irq, substream);
51	if (ret < 0)
52		goto err2;
53	rtd->dma_ch = ret;
54
55	ret = client->startup(substream);
56	if (!ret)
57		goto out;
58
59	pxa_free_dma(rtd->dma_ch);
60 err2:
61	__pxa2xx_pcm_close(substream);
62 out:
63	return ret;
64}
65
66static int pxa2xx_pcm_close(struct snd_pcm_substream *substream)
67{
68	struct pxa2xx_pcm_client *client = substream->private_data;
69	struct pxa2xx_runtime_data *rtd = substream->runtime->private_data;
70
71	pxa_free_dma(rtd->dma_ch);
72	client->shutdown(substream);
73
74	return __pxa2xx_pcm_close(substream);
75}
76
77static struct snd_pcm_ops pxa2xx_pcm_ops = {
78	.open		= pxa2xx_pcm_open,
79	.close		= pxa2xx_pcm_close,
80	.ioctl		= snd_pcm_lib_ioctl,
81	.hw_params	= __pxa2xx_pcm_hw_params,
82	.hw_free	= __pxa2xx_pcm_hw_free,
83	.prepare	= pxa2xx_pcm_prepare,
84	.trigger	= pxa2xx_pcm_trigger,
85	.pointer	= pxa2xx_pcm_pointer,
86	.mmap		= pxa2xx_pcm_mmap,
87};
88
89int pxa2xx_pcm_new(struct snd_card *card, struct pxa2xx_pcm_client *client,
90		   struct snd_pcm **rpcm)
91{
92	struct snd_pcm *pcm;
93	int play = client->playback_params ? 1 : 0;
94	int capt = client->capture_params ? 1 : 0;
95	int ret;
96
97	ret = snd_pcm_new(card, "PXA2xx-PCM", 0, play, capt, &pcm);
98	if (ret)
99		goto out;
100
101	pcm->private_data = client;
102	pcm->private_free = pxa2xx_pcm_free_dma_buffers;
103
104	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
105	if (ret)
106		goto out;
107
108	if (play) {
109		int stream = SNDRV_PCM_STREAM_PLAYBACK;
110		snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
111		ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
112		if (ret)
113			goto out;
114	}
115	if (capt) {
116		int stream = SNDRV_PCM_STREAM_CAPTURE;
117		snd_pcm_set_ops(pcm, stream, &pxa2xx_pcm_ops);
118		ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
119		if (ret)
120			goto out;
121	}
122
123	if (rpcm)
124		*rpcm = pcm;
125	ret = 0;
126
127 out:
128	return ret;
129}
130
131EXPORT_SYMBOL(pxa2xx_pcm_new);
132
133MODULE_AUTHOR("Nicolas Pitre");
134MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
135MODULE_LICENSE("GPL");
136