Merge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma
[linux-2.6.git] / sound / soc / imx / imx-pcm-dma-mx2.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 <mach/dma.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         dma_data->peripheral_type = IMX_DMATYPE_SSI;
113         dma_data->priority = DMA_PRIO_HIGH;
114         dma_data->dma_request = dma_params->dma;
115
116         ret = snd_dmaengine_pcm_open(substream, filter, dma_data);
117         if (ret) {
118                 kfree(dma_data);
119                 return 0;
120         }
121
122         snd_dmaengine_pcm_set_data(substream, dma_data);
123
124         return 0;
125 }
126
127 static int snd_imx_close(struct snd_pcm_substream *substream)
128 {
129         struct imx_dma_data *dma_data = snd_dmaengine_pcm_get_data(substream);
130
131         snd_dmaengine_pcm_close(substream);
132         kfree(dma_data);
133
134         return 0;
135 }
136
137 static struct snd_pcm_ops imx_pcm_ops = {
138         .open           = snd_imx_open,
139         .close          = snd_imx_close,
140         .ioctl          = snd_pcm_lib_ioctl,
141         .hw_params      = snd_imx_pcm_hw_params,
142         .trigger        = snd_dmaengine_pcm_trigger,
143         .pointer        = snd_dmaengine_pcm_pointer,
144         .mmap           = snd_imx_pcm_mmap,
145 };
146
147 static struct snd_soc_platform_driver imx_soc_platform_mx2 = {
148         .ops            = &imx_pcm_ops,
149         .pcm_new        = imx_pcm_new,
150         .pcm_free       = imx_pcm_free,
151 };
152
153 static int __devinit imx_soc_platform_probe(struct platform_device *pdev)
154 {
155         return snd_soc_register_platform(&pdev->dev, &imx_soc_platform_mx2);
156 }
157
158 static int __devexit imx_soc_platform_remove(struct platform_device *pdev)
159 {
160         snd_soc_unregister_platform(&pdev->dev);
161         return 0;
162 }
163
164 static struct platform_driver imx_pcm_driver = {
165         .driver = {
166                         .name = "imx-pcm-audio",
167                         .owner = THIS_MODULE,
168         },
169         .probe = imx_soc_platform_probe,
170         .remove = __devexit_p(imx_soc_platform_remove),
171 };
172
173 module_platform_driver(imx_pcm_driver);
174 MODULE_LICENSE("GPL");
175 MODULE_ALIAS("platform:imx-pcm-audio");