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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 | |
25 | static 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 | |
34 | static 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 | |
66 | static 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 | |
77 | static 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 | |
89 | int 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 | |
131 | EXPORT_SYMBOL(pxa2xx_pcm_new); |
132 | |
133 | MODULE_AUTHOR("Nicolas Pitre"); |
134 | MODULE_DESCRIPTION("Intel PXA2xx PCM DMA module"); |
135 | MODULE_LICENSE("GPL"); |
136 |
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