ASoC: fsl: fix snd-soc-imx-pcm module build
[~shefty/rdma-dev.git] / sound / soc / fsl / imx-pcm.c
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);
106
107 static int imx_pcm_probe(struct platform_device *pdev)
108 {
109         if (strcmp(pdev->id_entry->name, "imx-fiq-pcm-audio") == 0)
110                 return imx_pcm_fiq_init(pdev);
111
112         return imx_pcm_dma_init(pdev);
113 }
114
115 static int imx_pcm_remove(struct platform_device *pdev)
116 {
117         snd_soc_unregister_platform(&pdev->dev);
118         return 0;
119 }
120
121 static struct platform_device_id imx_pcm_devtype[] = {
122         { .name = "imx-pcm-audio", },
123         { .name = "imx-fiq-pcm-audio", },
124         { /* sentinel */ }
125 };
126 MODULE_DEVICE_TABLE(platform, imx_pcm_devtype);
127
128 static struct platform_driver imx_pcm_driver = {
129         .driver = {
130                         .name = "imx-pcm",
131                         .owner = THIS_MODULE,
132         },
133         .id_table = imx_pcm_devtype,
134         .probe = imx_pcm_probe,
135         .remove = imx_pcm_remove,
136 };
137 module_platform_driver(imx_pcm_driver);
138
139 MODULE_DESCRIPTION("Freescale i.MX PCM driver");
140 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
141 MODULE_LICENSE("GPL");