ASoC: mxs-pcm: Request DMA channel early
[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
32 #include <sound/core.h>
33 #include <sound/initval.h>
34 #include <sound/pcm.h>
35 #include <sound/pcm_params.h>
36 #include <sound/soc.h>
37
38 #include <mach/dma.h>
39 #include "mxs-pcm.h"
40
41 static struct snd_pcm_hardware snd_mxs_hardware = {
42         .info                   = SNDRV_PCM_INFO_MMAP |
43                                   SNDRV_PCM_INFO_MMAP_VALID |
44                                   SNDRV_PCM_INFO_PAUSE |
45                                   SNDRV_PCM_INFO_RESUME |
46                                   SNDRV_PCM_INFO_INTERLEAVED,
47         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
48                                   SNDRV_PCM_FMTBIT_S20_3LE |
49                                   SNDRV_PCM_FMTBIT_S24_LE,
50         .channels_min           = 2,
51         .channels_max           = 2,
52         .period_bytes_min       = 32,
53         .period_bytes_max       = 8192,
54         .periods_min            = 1,
55         .periods_max            = 52,
56         .buffer_bytes_max       = 64 * 1024,
57         .fifo_size              = 32,
58
59 };
60
61 static void audio_dma_irq(void *data)
62 {
63         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)data;
64         struct snd_pcm_runtime *runtime = substream->runtime;
65         struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
66
67         iprtd->offset += iprtd->period_bytes;
68         iprtd->offset %= iprtd->period_bytes * iprtd->periods;
69         snd_pcm_period_elapsed(substream);
70 }
71
72 static bool filter(struct dma_chan *chan, void *param)
73 {
74         struct mxs_pcm_runtime_data *iprtd = param;
75         struct mxs_pcm_dma_params *dma_params = iprtd->dma_params;
76
77         if (!mxs_dma_is_apbx(chan))
78                 return false;
79
80         if (chan->chan_id != dma_params->chan_num)
81                 return false;
82
83         chan->private = &iprtd->dma_data;
84
85         return true;
86 }
87
88 static int mxs_dma_alloc(struct snd_pcm_substream *substream)
89 {
90         struct snd_soc_pcm_runtime *rtd = substream->private_data;
91         struct snd_pcm_runtime *runtime = substream->runtime;
92         struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
93         dma_cap_mask_t mask;
94
95         iprtd->dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
96
97         dma_cap_zero(mask);
98         dma_cap_set(DMA_SLAVE, mask);
99         iprtd->dma_data.chan_irq = iprtd->dma_params->chan_irq;
100         iprtd->dma_chan = dma_request_channel(mask, filter, iprtd);
101         if (!iprtd->dma_chan)
102                 return -EINVAL;
103
104         return 0;
105 }
106
107 static int snd_mxs_pcm_hw_params(struct snd_pcm_substream *substream,
108                                 struct snd_pcm_hw_params *params)
109 {
110         struct snd_pcm_runtime *runtime = substream->runtime;
111         struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
112         unsigned long dma_addr;
113         struct dma_chan *chan;
114
115         chan = iprtd->dma_chan;
116
117         iprtd->periods = params_periods(params);
118         iprtd->period_bytes = params_period_bytes(params);
119         iprtd->offset = 0;
120
121         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
122
123         dma_addr = runtime->dma_addr;
124
125         iprtd->desc = chan->device->device_prep_dma_cyclic(chan, dma_addr,
126                         iprtd->period_bytes * iprtd->periods,
127                         iprtd->period_bytes,
128                         substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
129                         DMA_MEM_TO_DEV : DMA_DEV_TO_MEM);
130         if (!iprtd->desc) {
131                 dev_err(&chan->dev->device, "cannot prepare slave dma\n");
132                 return -EINVAL;
133         }
134
135         iprtd->desc->callback = audio_dma_irq;
136         iprtd->desc->callback_param = substream;
137
138         return 0;
139 }
140
141 static int snd_mxs_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
142 {
143         struct snd_pcm_runtime *runtime = substream->runtime;
144         struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
145
146         switch (cmd) {
147         case SNDRV_PCM_TRIGGER_START:
148         case SNDRV_PCM_TRIGGER_RESUME:
149         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
150                 dmaengine_submit(iprtd->desc);
151
152                 break;
153         case SNDRV_PCM_TRIGGER_STOP:
154         case SNDRV_PCM_TRIGGER_SUSPEND:
155         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
156                 dmaengine_terminate_all(iprtd->dma_chan);
157
158                 break;
159         default:
160                 return -EINVAL;
161         }
162
163         return 0;
164 }
165
166 static snd_pcm_uframes_t snd_mxs_pcm_pointer(
167                 struct snd_pcm_substream *substream)
168 {
169         struct snd_pcm_runtime *runtime = substream->runtime;
170         struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
171
172         return bytes_to_frames(substream->runtime, iprtd->offset);
173 }
174
175 static int snd_mxs_open(struct snd_pcm_substream *substream)
176 {
177         struct snd_pcm_runtime *runtime = substream->runtime;
178         struct mxs_pcm_runtime_data *iprtd;
179         int ret;
180
181         iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
182         if (iprtd == NULL)
183                 return -ENOMEM;
184         runtime->private_data = iprtd;
185
186         ret = snd_pcm_hw_constraint_integer(substream->runtime,
187                         SNDRV_PCM_HW_PARAM_PERIODS);
188         if (ret < 0) {
189                 kfree(iprtd);
190                 return ret;
191         }
192
193         ret = mxs_dma_alloc(substream);
194         if (ret) {
195                 kfree(iprtd);
196                 return ret;
197         }
198
199         snd_soc_set_runtime_hwparams(substream, &snd_mxs_hardware);
200
201         return 0;
202 }
203
204 static int snd_mxs_close(struct snd_pcm_substream *substream)
205 {
206         struct snd_pcm_runtime *runtime = substream->runtime;
207         struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
208
209         dma_release_channel(iprtd->dma_chan);
210         kfree(iprtd);
211
212         return 0;
213 }
214
215 static int snd_mxs_pcm_mmap(struct snd_pcm_substream *substream,
216                 struct vm_area_struct *vma)
217 {
218         struct snd_pcm_runtime *runtime = substream->runtime;
219
220         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
221                                         runtime->dma_area,
222                                         runtime->dma_addr,
223                                         runtime->dma_bytes);
224 }
225
226 static struct snd_pcm_ops mxs_pcm_ops = {
227         .open           = snd_mxs_open,
228         .close          = snd_mxs_close,
229         .ioctl          = snd_pcm_lib_ioctl,
230         .hw_params      = snd_mxs_pcm_hw_params,
231         .trigger        = snd_mxs_pcm_trigger,
232         .pointer        = snd_mxs_pcm_pointer,
233         .mmap           = snd_mxs_pcm_mmap,
234 };
235
236 static int mxs_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
237 {
238         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
239         struct snd_dma_buffer *buf = &substream->dma_buffer;
240         size_t size = snd_mxs_hardware.buffer_bytes_max;
241
242         buf->dev.type = SNDRV_DMA_TYPE_DEV;
243         buf->dev.dev = pcm->card->dev;
244         buf->private_data = NULL;
245         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
246                                            &buf->addr, GFP_KERNEL);
247         if (!buf->area)
248                 return -ENOMEM;
249         buf->bytes = size;
250
251         return 0;
252 }
253
254 static u64 mxs_pcm_dmamask = DMA_BIT_MASK(32);
255 static int mxs_pcm_new(struct snd_soc_pcm_runtime *rtd)
256 {
257         struct snd_card *card = rtd->card->snd_card;
258         struct snd_pcm *pcm = rtd->pcm;
259         int ret = 0;
260
261         if (!card->dev->dma_mask)
262                 card->dev->dma_mask = &mxs_pcm_dmamask;
263         if (!card->dev->coherent_dma_mask)
264                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
265
266         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
267                 ret = mxs_pcm_preallocate_dma_buffer(pcm,
268                         SNDRV_PCM_STREAM_PLAYBACK);
269                 if (ret)
270                         goto out;
271         }
272
273         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
274                 ret = mxs_pcm_preallocate_dma_buffer(pcm,
275                         SNDRV_PCM_STREAM_CAPTURE);
276                 if (ret)
277                         goto out;
278         }
279
280 out:
281         return ret;
282 }
283
284 static void mxs_pcm_free(struct snd_pcm *pcm)
285 {
286         struct snd_pcm_substream *substream;
287         struct snd_dma_buffer *buf;
288         int stream;
289
290         for (stream = 0; stream < 2; stream++) {
291                 substream = pcm->streams[stream].substream;
292                 if (!substream)
293                         continue;
294
295                 buf = &substream->dma_buffer;
296                 if (!buf->area)
297                         continue;
298
299                 dma_free_writecombine(pcm->card->dev, buf->bytes,
300                                       buf->area, buf->addr);
301                 buf->area = NULL;
302         }
303 }
304
305 static struct snd_soc_platform_driver mxs_soc_platform = {
306         .ops            = &mxs_pcm_ops,
307         .pcm_new        = mxs_pcm_new,
308         .pcm_free       = mxs_pcm_free,
309 };
310
311 static int __devinit mxs_soc_platform_probe(struct platform_device *pdev)
312 {
313         return snd_soc_register_platform(&pdev->dev, &mxs_soc_platform);
314 }
315
316 static int __devexit mxs_soc_platform_remove(struct platform_device *pdev)
317 {
318         snd_soc_unregister_platform(&pdev->dev);
319
320         return 0;
321 }
322
323 static struct platform_driver mxs_pcm_driver = {
324         .driver = {
325                 .name = "mxs-pcm-audio",
326                 .owner = THIS_MODULE,
327         },
328         .probe = mxs_soc_platform_probe,
329         .remove = __devexit_p(mxs_soc_platform_remove),
330 };
331
332 module_platform_driver(mxs_pcm_driver);
333
334 MODULE_LICENSE("GPL");
335 MODULE_ALIAS("platform:mxs-pcm-audio");