Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid
[firefly-linux-kernel-4.4.55.git] / sound / soc / omap / omap-pcm.c
1 /*
2  * omap-pcm.c  --  ALSA PCM interface for the OMAP SoC
3  *
4  * Copyright (C) 2008 Nokia Corporation
5  *
6  * Contact: Jarkko Nikula <jarkko.nikula@bitmer.com>
7  *          Peter Ujfalusi <peter.ujfalusi@ti.com>
8  *
9  * This program is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU General Public License
11  * version 2 as published by the Free Software Foundation.
12  *
13  * This program is distributed in the hope that it will be useful, but
14  * WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
21  * 02110-1301 USA
22  *
23  */
24
25 #include <linux/dma-mapping.h>
26 #include <linux/slab.h>
27 #include <linux/module.h>
28 #include <linux/omap-dma.h>
29 #include <sound/core.h>
30 #include <sound/pcm.h>
31 #include <sound/pcm_params.h>
32 #include <sound/dmaengine_pcm.h>
33 #include <sound/soc.h>
34
35 #ifdef CONFIG_ARCH_OMAP1
36 #define pcm_omap1510()  cpu_is_omap1510()
37 #else
38 #define pcm_omap1510()  0
39 #endif
40
41 static const struct snd_pcm_hardware omap_pcm_hardware = {
42         .info                   = SNDRV_PCM_INFO_MMAP |
43                                   SNDRV_PCM_INFO_MMAP_VALID |
44                                   SNDRV_PCM_INFO_INTERLEAVED |
45                                   SNDRV_PCM_INFO_PAUSE |
46                                   SNDRV_PCM_INFO_RESUME |
47                                   SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
48         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
49                                   SNDRV_PCM_FMTBIT_S32_LE,
50         .period_bytes_min       = 32,
51         .period_bytes_max       = 64 * 1024,
52         .periods_min            = 2,
53         .periods_max            = 255,
54         .buffer_bytes_max       = 128 * 1024,
55 };
56
57 /* this may get called several times by oss emulation */
58 static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
59                               struct snd_pcm_hw_params *params)
60 {
61         struct snd_pcm_runtime *runtime = substream->runtime;
62         struct snd_soc_pcm_runtime *rtd = substream->private_data;
63         struct omap_pcm_dma_data *dma_data;
64         struct dma_slave_config config;
65         struct dma_chan *chan;
66         int err = 0;
67
68         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
69
70         /* return if this is a bufferless transfer e.g.
71          * codec <--> BT codec or GSM modem -- lg FIXME */
72         if (!dma_data)
73                 return 0;
74
75         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
76         runtime->dma_bytes = params_buffer_bytes(params);
77
78         chan = snd_dmaengine_pcm_get_chan(substream);
79         if (!chan)
80                 return -EINVAL;
81
82         /* fills in addr_width and direction */
83         err = snd_hwparams_to_dma_slave_config(substream, params, &config);
84         if (err)
85                 return err;
86
87         snd_dmaengine_pcm_set_config_from_dai_data(substream,
88                         snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
89                         &config);
90
91         return dmaengine_slave_config(chan, &config);
92 }
93
94 static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
95 {
96         snd_pcm_set_runtime_buffer(substream, NULL);
97         return 0;
98 }
99
100 static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
101 {
102         snd_pcm_uframes_t offset;
103
104         if (pcm_omap1510())
105                 offset = snd_dmaengine_pcm_pointer_no_residue(substream);
106         else
107                 offset = snd_dmaengine_pcm_pointer(substream);
108
109         return offset;
110 }
111
112 static int omap_pcm_open(struct snd_pcm_substream *substream)
113 {
114         struct snd_soc_pcm_runtime *rtd = substream->private_data;
115         struct snd_dmaengine_dai_dma_data *dma_data;
116
117         snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
118
119         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
120
121         return snd_dmaengine_pcm_open_request_chan(substream,
122                                                    omap_dma_filter_fn,
123                                                    dma_data->filter_data);
124 }
125
126 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
127         struct vm_area_struct *vma)
128 {
129         struct snd_pcm_runtime *runtime = substream->runtime;
130
131         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
132                                      runtime->dma_area,
133                                      runtime->dma_addr,
134                                      runtime->dma_bytes);
135 }
136
137 static struct snd_pcm_ops omap_pcm_ops = {
138         .open           = omap_pcm_open,
139         .close          = snd_dmaengine_pcm_close_release_chan,
140         .ioctl          = snd_pcm_lib_ioctl,
141         .hw_params      = omap_pcm_hw_params,
142         .hw_free        = omap_pcm_hw_free,
143         .trigger        = snd_dmaengine_pcm_trigger,
144         .pointer        = omap_pcm_pointer,
145         .mmap           = omap_pcm_mmap,
146 };
147
148 static u64 omap_pcm_dmamask = DMA_BIT_MASK(64);
149
150 static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
151         int stream)
152 {
153         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
154         struct snd_dma_buffer *buf = &substream->dma_buffer;
155         size_t size = omap_pcm_hardware.buffer_bytes_max;
156
157         buf->dev.type = SNDRV_DMA_TYPE_DEV;
158         buf->dev.dev = pcm->card->dev;
159         buf->private_data = NULL;
160         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
161                                            &buf->addr, GFP_KERNEL);
162         if (!buf->area)
163                 return -ENOMEM;
164
165         buf->bytes = size;
166         return 0;
167 }
168
169 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
170 {
171         struct snd_pcm_substream *substream;
172         struct snd_dma_buffer *buf;
173         int stream;
174
175         for (stream = 0; stream < 2; stream++) {
176                 substream = pcm->streams[stream].substream;
177                 if (!substream)
178                         continue;
179
180                 buf = &substream->dma_buffer;
181                 if (!buf->area)
182                         continue;
183
184                 dma_free_writecombine(pcm->card->dev, buf->bytes,
185                                       buf->area, buf->addr);
186                 buf->area = NULL;
187         }
188 }
189
190 static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
191 {
192         struct snd_card *card = rtd->card->snd_card;
193         struct snd_pcm *pcm = rtd->pcm;
194         int ret = 0;
195
196         if (!card->dev->dma_mask)
197                 card->dev->dma_mask = &omap_pcm_dmamask;
198         if (!card->dev->coherent_dma_mask)
199                 card->dev->coherent_dma_mask = DMA_BIT_MASK(64);
200
201         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
202                 ret = omap_pcm_preallocate_dma_buffer(pcm,
203                         SNDRV_PCM_STREAM_PLAYBACK);
204                 if (ret)
205                         goto out;
206         }
207
208         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
209                 ret = omap_pcm_preallocate_dma_buffer(pcm,
210                         SNDRV_PCM_STREAM_CAPTURE);
211                 if (ret)
212                         goto out;
213         }
214
215 out:
216         /* free preallocated buffers in case of error */
217         if (ret)
218                 omap_pcm_free_dma_buffers(pcm);
219
220         return ret;
221 }
222
223 static struct snd_soc_platform_driver omap_soc_platform = {
224         .ops            = &omap_pcm_ops,
225         .pcm_new        = omap_pcm_new,
226         .pcm_free       = omap_pcm_free_dma_buffers,
227 };
228
229 static int omap_pcm_probe(struct platform_device *pdev)
230 {
231         return snd_soc_register_platform(&pdev->dev,
232                         &omap_soc_platform);
233 }
234
235 static int omap_pcm_remove(struct platform_device *pdev)
236 {
237         snd_soc_unregister_platform(&pdev->dev);
238         return 0;
239 }
240
241 static struct platform_driver omap_pcm_driver = {
242         .driver = {
243                         .name = "omap-pcm-audio",
244                         .owner = THIS_MODULE,
245         },
246
247         .probe = omap_pcm_probe,
248         .remove = omap_pcm_remove,
249 };
250
251 module_platform_driver(omap_pcm_driver);
252
253 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
254 MODULE_DESCRIPTION("OMAP PCM DMA module");
255 MODULE_LICENSE("GPL");
256 MODULE_ALIAS("platform:omap-pcm-audio");