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[~shefty/rdma-dev.git] / sound / soc / fsl / imx-pcm-dma.c
1 /*
2  * imx-pcm-dma-mx2.c  --  ALSA Soc Audio Layer
3  *
4  * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
5  *
6  * This code is based on code copyrighted by Freescale,
7  * Liam Girdwood, Javier Martin and probably others.
8  *
9  *  This program is free software; you can redistribute  it and/or modify it
10  *  under  the terms of  the GNU General  Public License as published by the
11  *  Free Software Foundation;  either version 2 of the  License, or (at your
12  *  option) any later version.
13  */
14 #include <linux/clk.h>
15 #include <linux/delay.h>
16 #include <linux/device.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/init.h>
19 #include <linux/interrupt.h>
20 #include <linux/module.h>
21 #include <linux/platform_device.h>
22 #include <linux/slab.h>
23 #include <linux/dmaengine.h>
24 #include <linux/types.h>
25
26 #include <sound/core.h>
27 #include <sound/initval.h>
28 #include <sound/pcm.h>
29 #include <sound/pcm_params.h>
30 #include <sound/soc.h>
31 #include <sound/dmaengine_pcm.h>
32
33 #include <linux/platform_data/dma-imx.h>
34
35 #include "imx-pcm.h"
36
37 static bool filter(struct dma_chan *chan, void *param)
38 {
39         if (!imx_dma_is_general_purpose(chan))
40                 return false;
41
42         chan->private = param;
43
44         return true;
45 }
46
47 static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
48                                 struct snd_pcm_hw_params *params)
49 {
50         struct snd_soc_pcm_runtime *rtd = substream->private_data;
51         struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
52         struct imx_pcm_dma_params *dma_params;
53         struct dma_slave_config slave_config;
54         int ret;
55
56         dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
57
58         ret = snd_hwparams_to_dma_slave_config(substream, params, &slave_config);
59         if (ret)
60                 return ret;
61
62         slave_config.device_fc = false;
63
64         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
65                 slave_config.dst_addr = dma_params->dma_addr;
66                 slave_config.dst_maxburst = dma_params->burstsize;
67         } else {
68                 slave_config.src_addr = dma_params->dma_addr;
69                 slave_config.src_maxburst = dma_params->burstsize;
70         }
71
72         ret = dmaengine_slave_config(chan, &slave_config);
73         if (ret)
74                 return ret;
75
76         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
77
78         return 0;
79 }
80
81 static struct snd_pcm_hardware snd_imx_hardware = {
82         .info = SNDRV_PCM_INFO_INTERLEAVED |
83                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
84                 SNDRV_PCM_INFO_MMAP |
85                 SNDRV_PCM_INFO_MMAP_VALID |
86                 SNDRV_PCM_INFO_PAUSE |
87                 SNDRV_PCM_INFO_RESUME,
88         .formats = SNDRV_PCM_FMTBIT_S16_LE,
89         .rate_min = 8000,
90         .channels_min = 2,
91         .channels_max = 2,
92         .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
93         .period_bytes_min = 128,
94         .period_bytes_max = 65535, /* Limited by SDMA engine */
95         .periods_min = 2,
96         .periods_max = 255,
97         .fifo_size = 0,
98 };
99
100 static int snd_imx_open(struct snd_pcm_substream *substream)
101 {
102         struct snd_soc_pcm_runtime *rtd = substream->private_data;
103         struct imx_pcm_dma_params *dma_params;
104         struct imx_dma_data *dma_data;
105         int ret;
106
107         snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
108
109         dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
110
111         dma_data = kzalloc(sizeof(*dma_data), GFP_KERNEL);
112         if (!dma_data)
113                 return -ENOMEM;
114
115         dma_data->peripheral_type = dma_params->shared_peripheral ?
116                                         IMX_DMATYPE_SSI_SP : IMX_DMATYPE_SSI;
117         dma_data->priority = DMA_PRIO_HIGH;
118         dma_data->dma_request = dma_params->dma;
119
120         ret = snd_dmaengine_pcm_open(substream, filter, dma_data);
121         if (ret) {
122                 kfree(dma_data);
123                 return ret;
124         }
125
126         snd_dmaengine_pcm_set_data(substream, dma_data);
127
128         return 0;
129 }
130
131 static int snd_imx_close(struct snd_pcm_substream *substream)
132 {
133         struct imx_dma_data *dma_data = snd_dmaengine_pcm_get_data(substream);
134
135         snd_dmaengine_pcm_close(substream);
136         kfree(dma_data);
137
138         return 0;
139 }
140
141 static struct snd_pcm_ops imx_pcm_ops = {
142         .open           = snd_imx_open,
143         .close          = snd_imx_close,
144         .ioctl          = snd_pcm_lib_ioctl,
145         .hw_params      = snd_imx_pcm_hw_params,
146         .trigger        = snd_dmaengine_pcm_trigger,
147         .pointer        = snd_dmaengine_pcm_pointer_no_residue,
148         .mmap           = snd_imx_pcm_mmap,
149 };
150
151 static struct snd_soc_platform_driver imx_soc_platform_mx2 = {
152         .ops            = &imx_pcm_ops,
153         .pcm_new        = imx_pcm_new,
154         .pcm_free       = imx_pcm_free,
155 };
156
157 static int imx_soc_platform_probe(struct platform_device *pdev)
158 {
159         return snd_soc_register_platform(&pdev->dev, &imx_soc_platform_mx2);
160 }
161
162 static int imx_soc_platform_remove(struct platform_device *pdev)
163 {
164         snd_soc_unregister_platform(&pdev->dev);
165         return 0;
166 }
167
168 static struct platform_driver imx_pcm_driver = {
169         .driver = {
170                         .name = "imx-pcm-audio",
171                         .owner = THIS_MODULE,
172         },
173         .probe = imx_soc_platform_probe,
174         .remove = imx_soc_platform_remove,
175 };
176
177 module_platform_driver(imx_pcm_driver);
178 MODULE_LICENSE("GPL");
179 MODULE_ALIAS("platform:imx-pcm-audio");