Merge branch 'for-3.2' into for-3.3
[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                                 struct snd_pcm_hw_params *params)
90 {
91         struct snd_soc_pcm_runtime *rtd = substream->private_data;
92         struct snd_pcm_runtime *runtime = substream->runtime;
93         struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
94         dma_cap_mask_t mask;
95
96         iprtd->dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
97
98         dma_cap_zero(mask);
99         dma_cap_set(DMA_SLAVE, mask);
100         iprtd->dma_data.chan_irq = iprtd->dma_params->chan_irq;
101         iprtd->dma_chan = dma_request_channel(mask, filter, iprtd);
102         if (!iprtd->dma_chan)
103                 return -EINVAL;
104
105         return 0;
106 }
107
108 static int snd_mxs_pcm_hw_params(struct snd_pcm_substream *substream,
109                                 struct snd_pcm_hw_params *params)
110 {
111         struct snd_pcm_runtime *runtime = substream->runtime;
112         struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
113         unsigned long dma_addr;
114         struct dma_chan *chan;
115         int ret;
116
117         ret = mxs_dma_alloc(substream, params);
118         if (ret)
119                 return ret;
120         chan = iprtd->dma_chan;
121
122         iprtd->size = params_buffer_bytes(params);
123         iprtd->periods = params_periods(params);
124         iprtd->period_bytes = params_period_bytes(params);
125         iprtd->offset = 0;
126         iprtd->period_time = HZ / (params_rate(params) /
127                         params_period_size(params));
128
129         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
130
131         dma_addr = runtime->dma_addr;
132
133         iprtd->buf = substream->dma_buffer.area;
134
135         iprtd->desc = chan->device->device_prep_dma_cyclic(chan, dma_addr,
136                         iprtd->period_bytes * iprtd->periods,
137                         iprtd->period_bytes,
138                         substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
139                         DMA_TO_DEVICE : DMA_FROM_DEVICE);
140         if (!iprtd->desc) {
141                 dev_err(&chan->dev->device, "cannot prepare slave dma\n");
142                 return -EINVAL;
143         }
144
145         iprtd->desc->callback = audio_dma_irq;
146         iprtd->desc->callback_param = substream;
147
148         return 0;
149 }
150
151 static int snd_mxs_pcm_hw_free(struct snd_pcm_substream *substream)
152 {
153         struct snd_pcm_runtime *runtime = substream->runtime;
154         struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
155
156         if (iprtd->dma_chan) {
157                 dma_release_channel(iprtd->dma_chan);
158                 iprtd->dma_chan = NULL;
159         }
160
161         return 0;
162 }
163
164 static int snd_mxs_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
165 {
166         struct snd_pcm_runtime *runtime = substream->runtime;
167         struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
168
169         switch (cmd) {
170         case SNDRV_PCM_TRIGGER_START:
171         case SNDRV_PCM_TRIGGER_RESUME:
172         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
173                 dmaengine_submit(iprtd->desc);
174
175                 break;
176         case SNDRV_PCM_TRIGGER_STOP:
177         case SNDRV_PCM_TRIGGER_SUSPEND:
178         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
179                 dmaengine_terminate_all(iprtd->dma_chan);
180
181                 break;
182         default:
183                 return -EINVAL;
184         }
185
186         return 0;
187 }
188
189 static snd_pcm_uframes_t snd_mxs_pcm_pointer(
190                 struct snd_pcm_substream *substream)
191 {
192         struct snd_pcm_runtime *runtime = substream->runtime;
193         struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
194
195         return bytes_to_frames(substream->runtime, iprtd->offset);
196 }
197
198 static int snd_mxs_open(struct snd_pcm_substream *substream)
199 {
200         struct snd_pcm_runtime *runtime = substream->runtime;
201         struct mxs_pcm_runtime_data *iprtd;
202         int ret;
203
204         iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
205         if (iprtd == NULL)
206                 return -ENOMEM;
207         runtime->private_data = iprtd;
208
209         ret = snd_pcm_hw_constraint_integer(substream->runtime,
210                         SNDRV_PCM_HW_PARAM_PERIODS);
211         if (ret < 0) {
212                 kfree(iprtd);
213                 return ret;
214         }
215
216         snd_soc_set_runtime_hwparams(substream, &snd_mxs_hardware);
217
218         return 0;
219 }
220
221 static int snd_mxs_close(struct snd_pcm_substream *substream)
222 {
223         struct snd_pcm_runtime *runtime = substream->runtime;
224         struct mxs_pcm_runtime_data *iprtd = runtime->private_data;
225
226         kfree(iprtd);
227
228         return 0;
229 }
230
231 static int snd_mxs_pcm_mmap(struct snd_pcm_substream *substream,
232                 struct vm_area_struct *vma)
233 {
234         struct snd_pcm_runtime *runtime = substream->runtime;
235
236         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
237                                         runtime->dma_area,
238                                         runtime->dma_addr,
239                                         runtime->dma_bytes);
240 }
241
242 static struct snd_pcm_ops mxs_pcm_ops = {
243         .open           = snd_mxs_open,
244         .close          = snd_mxs_close,
245         .ioctl          = snd_pcm_lib_ioctl,
246         .hw_params      = snd_mxs_pcm_hw_params,
247         .hw_free        = snd_mxs_pcm_hw_free,
248         .trigger        = snd_mxs_pcm_trigger,
249         .pointer        = snd_mxs_pcm_pointer,
250         .mmap           = snd_mxs_pcm_mmap,
251 };
252
253 static int mxs_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
254 {
255         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
256         struct snd_dma_buffer *buf = &substream->dma_buffer;
257         size_t size = snd_mxs_hardware.buffer_bytes_max;
258
259         buf->dev.type = SNDRV_DMA_TYPE_DEV;
260         buf->dev.dev = pcm->card->dev;
261         buf->private_data = NULL;
262         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
263                                            &buf->addr, GFP_KERNEL);
264         if (!buf->area)
265                 return -ENOMEM;
266         buf->bytes = size;
267
268         return 0;
269 }
270
271 static u64 mxs_pcm_dmamask = DMA_BIT_MASK(32);
272 static int mxs_pcm_new(struct snd_soc_pcm_runtime *rtd)
273 {
274         struct snd_card *card = rtd->card->snd_card;
275         struct snd_pcm *pcm = rtd->pcm;
276         int ret = 0;
277
278         if (!card->dev->dma_mask)
279                 card->dev->dma_mask = &mxs_pcm_dmamask;
280         if (!card->dev->coherent_dma_mask)
281                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
282
283         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
284                 ret = mxs_pcm_preallocate_dma_buffer(pcm,
285                         SNDRV_PCM_STREAM_PLAYBACK);
286                 if (ret)
287                         goto out;
288         }
289
290         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
291                 ret = mxs_pcm_preallocate_dma_buffer(pcm,
292                         SNDRV_PCM_STREAM_CAPTURE);
293                 if (ret)
294                         goto out;
295         }
296
297 out:
298         return ret;
299 }
300
301 static void mxs_pcm_free(struct snd_pcm *pcm)
302 {
303         struct snd_pcm_substream *substream;
304         struct snd_dma_buffer *buf;
305         int stream;
306
307         for (stream = 0; stream < 2; stream++) {
308                 substream = pcm->streams[stream].substream;
309                 if (!substream)
310                         continue;
311
312                 buf = &substream->dma_buffer;
313                 if (!buf->area)
314                         continue;
315
316                 dma_free_writecombine(pcm->card->dev, buf->bytes,
317                                       buf->area, buf->addr);
318                 buf->area = NULL;
319         }
320 }
321
322 static struct snd_soc_platform_driver mxs_soc_platform = {
323         .ops            = &mxs_pcm_ops,
324         .pcm_new        = mxs_pcm_new,
325         .pcm_free       = mxs_pcm_free,
326 };
327
328 static int __devinit mxs_soc_platform_probe(struct platform_device *pdev)
329 {
330         return snd_soc_register_platform(&pdev->dev, &mxs_soc_platform);
331 }
332
333 static int __devexit mxs_soc_platform_remove(struct platform_device *pdev)
334 {
335         snd_soc_unregister_platform(&pdev->dev);
336
337         return 0;
338 }
339
340 static struct platform_driver mxs_pcm_driver = {
341         .driver = {
342                 .name = "mxs-pcm-audio",
343                 .owner = THIS_MODULE,
344         },
345         .probe = mxs_soc_platform_probe,
346         .remove = __devexit_p(mxs_soc_platform_remove),
347 };
348
349 module_platform_driver(mxs_pcm_driver);
350
351 MODULE_LICENSE("GPL");
352 MODULE_ALIAS("platform:mxs-pcm-audio");