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
filter(struct dma_chan * chan,void * param)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
snd_imx_pcm_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)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
snd_imx_open(struct snd_pcm_substream * substream)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
snd_imx_close(struct snd_pcm_substream * substream)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
imx_soc_platform_probe(struct platform_device * pdev)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
imx_soc_platform_remove(struct platform_device * pdev)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");
176