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4762fbab SG |
1 | /* |
2 | * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de> | |
3 | * | |
4 | * This code is based on code copyrighted by Freescale, | |
5 | * Liam Girdwood, Javier Martin and probably others. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2 of the License, or (at your | |
10 | * option) any later version. | |
11 | */ | |
12 | ||
13 | #include <linux/dma-mapping.h> | |
14 | #include <linux/module.h> | |
15 | #include <sound/pcm.h> | |
16 | #include <sound/soc.h> | |
17 | #include "imx-pcm.h" | |
18 | ||
19 | int snd_imx_pcm_mmap(struct snd_pcm_substream *substream, | |
20 | struct vm_area_struct *vma) | |
21 | { | |
22 | struct snd_pcm_runtime *runtime = substream->runtime; | |
23 | int ret; | |
24 | ||
25 | ret = dma_mmap_writecombine(substream->pcm->card->dev, vma, | |
26 | runtime->dma_area, runtime->dma_addr, runtime->dma_bytes); | |
27 | ||
28 | pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret, | |
29 | runtime->dma_area, | |
30 | runtime->dma_addr, | |
31 | runtime->dma_bytes); | |
32 | return ret; | |
33 | } | |
34 | EXPORT_SYMBOL_GPL(snd_imx_pcm_mmap); | |
35 | ||
36 | static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) | |
37 | { | |
38 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; | |
39 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
40 | size_t size = IMX_SSI_DMABUF_SIZE; | |
41 | ||
42 | buf->dev.type = SNDRV_DMA_TYPE_DEV; | |
43 | buf->dev.dev = pcm->card->dev; | |
44 | buf->private_data = NULL; | |
45 | buf->area = dma_alloc_writecombine(pcm->card->dev, size, | |
46 | &buf->addr, GFP_KERNEL); | |
47 | if (!buf->area) | |
48 | return -ENOMEM; | |
49 | buf->bytes = size; | |
50 | ||
51 | return 0; | |
52 | } | |
53 | ||
54 | static u64 imx_pcm_dmamask = DMA_BIT_MASK(32); | |
55 | ||
56 | int imx_pcm_new(struct snd_soc_pcm_runtime *rtd) | |
57 | { | |
58 | struct snd_card *card = rtd->card->snd_card; | |
59 | struct snd_pcm *pcm = rtd->pcm; | |
60 | int ret = 0; | |
61 | ||
62 | if (!card->dev->dma_mask) | |
63 | card->dev->dma_mask = &imx_pcm_dmamask; | |
64 | if (!card->dev->coherent_dma_mask) | |
65 | card->dev->coherent_dma_mask = DMA_BIT_MASK(32); | |
66 | if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { | |
67 | ret = imx_pcm_preallocate_dma_buffer(pcm, | |
68 | SNDRV_PCM_STREAM_PLAYBACK); | |
69 | if (ret) | |
70 | goto out; | |
71 | } | |
72 | ||
73 | if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { | |
74 | ret = imx_pcm_preallocate_dma_buffer(pcm, | |
75 | SNDRV_PCM_STREAM_CAPTURE); | |
76 | if (ret) | |
77 | goto out; | |
78 | } | |
79 | ||
80 | out: | |
81 | return ret; | |
82 | } | |
83 | EXPORT_SYMBOL_GPL(imx_pcm_new); | |
84 | ||
85 | void imx_pcm_free(struct snd_pcm *pcm) | |
86 | { | |
87 | struct snd_pcm_substream *substream; | |
88 | struct snd_dma_buffer *buf; | |
89 | int stream; | |
90 | ||
91 | for (stream = 0; stream < 2; stream++) { | |
92 | substream = pcm->streams[stream].substream; | |
93 | if (!substream) | |
94 | continue; | |
95 | ||
96 | buf = &substream->dma_buffer; | |
97 | if (!buf->area) | |
98 | continue; | |
99 | ||
100 | dma_free_writecombine(pcm->card->dev, buf->bytes, | |
101 | buf->area, buf->addr); | |
102 | buf->area = NULL; | |
103 | } | |
104 | } | |
105 | EXPORT_SYMBOL_GPL(imx_pcm_free); |