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
pxa2xx_pcm_prepare(struct snd_pcm_substream * substream)18 static 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
pxa2xx_pcm_open(struct snd_pcm_substream * substream)27 static 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
pxa2xx_pcm_close(struct snd_pcm_substream * substream)59 static 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
70 static 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
82 static u64 pxa2xx_pcm_dmamask = 0xffffffff;
83
pxa2xx_pcm_new(struct snd_card * card,struct pxa2xx_pcm_client * client,struct snd_pcm ** rpcm)84 int 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
127 EXPORT_SYMBOL(pxa2xx_pcm_new);
128
129 MODULE_AUTHOR("Nicolas Pitre");
130 MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module");
131 MODULE_LICENSE("GPL");
132