tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
19int 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}
34EXPORT_SYMBOL_GPL(snd_imx_pcm_mmap);
35
36static 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
54static u64 imx_pcm_dmamask = DMA_BIT_MASK(32);
55
56int 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
80out:
81 return ret;
82}
83EXPORT_SYMBOL_GPL(imx_pcm_new);
84
85void 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}
105EXPORT_SYMBOL_GPL(imx_pcm_free);