Merge branch '3.4-rc1' into android-tegra-nv-3.3-rebased
[linux-2.6.git] / sound / soc / mxs / mxs-pcm.c
1 /*
2  * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
3  *
4  * Based on sound/soc/imx/imx-pcm-dma-mx2.c
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License along
17  * with this program; if not, write to the Free Software Foundation, Inc.,
18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19  */
20
21 #include <linux/clk.h>
22 #include <linux/delay.h>
23 #include <linux/device.h>
24 #include <linux/dma-mapping.h>
25 #include <linux/init.h>
26 #include <linux/interrupt.h>
27 #include <linux/module.h>
28 #include <linux/platform_device.h>
29 #include <linux/slab.h>
30 #include <linux/dmaengine.h>
31 #include <linux/fsl/mxs-dma.h>
32
33 #include <sound/core.h>
34 #include <sound/initval.h>
35 #include <sound/pcm.h>
36 #include <sound/pcm_params.h>
37 #include <sound/soc.h>
38 #include <sound/dmaengine_pcm.h>
39
40 #include "mxs-pcm.h"
41
42 struct mxs_pcm_dma_data {
43         struct mxs_dma_data dma_data;
44         struct mxs_pcm_dma_params *dma_params;
45 };
46
47 static struct snd_pcm_hardware snd_mxs_hardware = {
48         .info                   = SNDRV_PCM_INFO_MMAP |
49                                   SNDRV_PCM_INFO_MMAP_VALID |
50                                   SNDRV_PCM_INFO_PAUSE |
51                                   SNDRV_PCM_INFO_RESUME |
52                                   SNDRV_PCM_INFO_INTERLEAVED,
53         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
54                                   SNDRV_PCM_FMTBIT_S20_3LE |
55                                   SNDRV_PCM_FMTBIT_S24_LE,
56         .channels_min           = 2,
57         .channels_max           = 2,
58         .period_bytes_min       = 32,
59         .period_bytes_max       = 8192,
60         .periods_min            = 1,
61         .periods_max            = 52,
62         .buffer_bytes_max       = 64 * 1024,
63         .fifo_size              = 32,
64
65 };
66
67 static bool filter(struct dma_chan *chan, void *param)
68 {
69         struct mxs_pcm_dma_data *pcm_dma_data = param;
70         struct mxs_pcm_dma_params *dma_params = pcm_dma_data->dma_params;
71
72         if (!mxs_dma_is_apbx(chan))
73                 return false;
74
75         if (chan->chan_id != dma_params->chan_num)
76                 return false;
77
78         chan->private = &pcm_dma_data->dma_data;
79
80         return true;
81 }
82
83 static int snd_mxs_pcm_hw_params(struct snd_pcm_substream *substream,
84                                 struct snd_pcm_hw_params *params)
85 {
86         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
87
88         return 0;
89 }
90
91 static int snd_mxs_open(struct snd_pcm_substream *substream)
92 {
93         struct snd_soc_pcm_runtime *rtd = substream->private_data;
94         struct mxs_pcm_dma_data *pcm_dma_data;
95         int ret;
96
97         pcm_dma_data = kzalloc(sizeof(*pcm_dma_data), GFP_KERNEL);
98         if (pcm_dma_data == NULL)
99                 return -ENOMEM;
100
101         pcm_dma_data->dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
102         pcm_dma_data->dma_data.chan_irq = pcm_dma_data->dma_params->chan_irq;
103
104         ret = snd_dmaengine_pcm_open(substream, filter, pcm_dma_data);
105         if (ret) {
106                 kfree(pcm_dma_data);
107                 return ret;
108         }
109
110         snd_soc_set_runtime_hwparams(substream, &snd_mxs_hardware);
111
112         snd_dmaengine_pcm_set_data(substream, pcm_dma_data);
113
114         return 0;
115 }
116
117 static int snd_mxs_close(struct snd_pcm_substream *substream)
118 {
119         struct mxs_pcm_dma_data *pcm_dma_data = snd_dmaengine_pcm_get_data(substream);
120
121         snd_dmaengine_pcm_close(substream);
122         kfree(pcm_dma_data);
123
124         return 0;
125 }
126
127 static int snd_mxs_pcm_mmap(struct snd_pcm_substream *substream,
128                 struct vm_area_struct *vma)
129 {
130         struct snd_pcm_runtime *runtime = substream->runtime;
131
132         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
133                                         runtime->dma_area,
134                                         runtime->dma_addr,
135                                         runtime->dma_bytes);
136 }
137
138 static struct snd_pcm_ops mxs_pcm_ops = {
139         .open           = snd_mxs_open,
140         .close          = snd_mxs_close,
141         .ioctl          = snd_pcm_lib_ioctl,
142         .hw_params      = snd_mxs_pcm_hw_params,
143         .trigger        = snd_dmaengine_pcm_trigger,
144         .pointer        = snd_dmaengine_pcm_pointer,
145         .mmap           = snd_mxs_pcm_mmap,
146 };
147
148 static int mxs_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
149 {
150         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
151         struct snd_dma_buffer *buf = &substream->dma_buffer;
152         size_t size = snd_mxs_hardware.buffer_bytes_max;
153
154         buf->dev.type = SNDRV_DMA_TYPE_DEV;
155         buf->dev.dev = pcm->card->dev;
156         buf->private_data = NULL;
157         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
158                                            &buf->addr, GFP_KERNEL);
159         if (!buf->area)
160                 return -ENOMEM;
161         buf->bytes = size;
162
163         return 0;
164 }
165
166 static u64 mxs_pcm_dmamask = DMA_BIT_MASK(32);
167 static int mxs_pcm_new(struct snd_soc_pcm_runtime *rtd)
168 {
169         struct snd_card *card = rtd->card->snd_card;
170         struct snd_pcm *pcm = rtd->pcm;
171         int ret = 0;
172
173         if (!card->dev->dma_mask)
174                 card->dev->dma_mask = &mxs_pcm_dmamask;
175         if (!card->dev->coherent_dma_mask)
176                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
177
178         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
179                 ret = mxs_pcm_preallocate_dma_buffer(pcm,
180                         SNDRV_PCM_STREAM_PLAYBACK);
181                 if (ret)
182                         goto out;
183         }
184
185         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
186                 ret = mxs_pcm_preallocate_dma_buffer(pcm,
187                         SNDRV_PCM_STREAM_CAPTURE);
188                 if (ret)
189                         goto out;
190         }
191
192 out:
193         return ret;
194 }
195
196 static void mxs_pcm_free(struct snd_pcm *pcm)
197 {
198         struct snd_pcm_substream *substream;
199         struct snd_dma_buffer *buf;
200         int stream;
201
202         for (stream = 0; stream < 2; stream++) {
203                 substream = pcm->streams[stream].substream;
204                 if (!substream)
205                         continue;
206
207                 buf = &substream->dma_buffer;
208                 if (!buf->area)
209                         continue;
210
211                 dma_free_writecombine(pcm->card->dev, buf->bytes,
212                                       buf->area, buf->addr);
213                 buf->area = NULL;
214         }
215 }
216
217 static struct snd_soc_platform_driver mxs_soc_platform = {
218         .ops            = &mxs_pcm_ops,
219         .pcm_new        = mxs_pcm_new,
220         .pcm_free       = mxs_pcm_free,
221 };
222
223 static int __devinit mxs_soc_platform_probe(struct platform_device *pdev)
224 {
225         return snd_soc_register_platform(&pdev->dev, &mxs_soc_platform);
226 }
227
228 static int __devexit mxs_soc_platform_remove(struct platform_device *pdev)
229 {
230         snd_soc_unregister_platform(&pdev->dev);
231
232         return 0;
233 }
234
235 static struct platform_driver mxs_pcm_driver = {
236         .driver = {
237                 .name = "mxs-pcm-audio",
238                 .owner = THIS_MODULE,
239         },
240         .probe = mxs_soc_platform_probe,
241         .remove = __devexit_p(mxs_soc_platform_remove),
242 };
243
244 module_platform_driver(mxs_pcm_driver);
245
246 MODULE_LICENSE("GPL");
247 MODULE_ALIAS("platform:mxs-pcm-audio");