ASoC: tegra: Constraint period size to be multiple of 8
[linux-2.6.git] / sound / soc / tegra / tegra_pcm.c
1 /*
2  * tegra_pcm.c - Tegra PCM driver
3  *
4  * Author: Stephen Warren <swarren@nvidia.com>
5  * Copyright (C) 2010 - NVIDIA, Inc.
6  *
7  * Based on code copyright/by:
8  *
9  * Copyright (c) 2009-2010, NVIDIA Corporation.
10  * Scott Peterson <speterson@nvidia.com>
11  * Vijay Mali <vmali@nvidia.com>
12  *
13  * Copyright (C) 2010 Google, Inc.
14  * Iliyan Malchev <malchev@google.com>
15  *
16  * This program is free software; you can redistribute it and/or
17  * modify it under the terms of the GNU General Public License
18  * version 2 as published by the Free Software Foundation.
19  *
20  * This program is distributed in the hope that it will be useful, but
21  * WITHOUT ANY WARRANTY; without even the implied warranty of
22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
23  * General Public License for more details.
24  *
25  * You should have received a copy of the GNU General Public License
26  * along with this program; if not, write to the Free Software
27  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
28  * 02110-1301 USA
29  *
30  */
31
32 #include <linux/module.h>
33 #include <linux/dma-mapping.h>
34 #include <linux/slab.h>
35 #include <sound/core.h>
36 #include <sound/pcm.h>
37 #include <sound/pcm_params.h>
38 #include <sound/soc.h>
39
40 #include "tegra_pcm.h"
41
42 #define DRV_NAME "tegra-pcm-audio"
43
44 static const struct snd_pcm_hardware tegra_pcm_hardware = {
45         .info                   = SNDRV_PCM_INFO_MMAP |
46                                   SNDRV_PCM_INFO_MMAP_VALID |
47                                   SNDRV_PCM_INFO_PAUSE |
48                                   SNDRV_PCM_INFO_RESUME |
49                                   SNDRV_PCM_INFO_INTERLEAVED,
50         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
51         .channels_min           = 2,
52         .channels_max           = 2,
53         .period_bytes_min       = 1024,
54         .period_bytes_max       = PAGE_SIZE,
55         .periods_min            = 2,
56         .periods_max            = 8,
57         .buffer_bytes_max       = PAGE_SIZE * 8,
58         .fifo_size              = 4,
59 };
60
61 static void tegra_pcm_queue_dma(struct tegra_runtime_data *prtd)
62 {
63         struct snd_pcm_substream *substream = prtd->substream;
64         struct snd_dma_buffer *buf = &substream->dma_buffer;
65         struct tegra_dma_req *dma_req;
66         unsigned long addr;
67
68         dma_req = &prtd->dma_req[prtd->dma_req_idx];
69         prtd->dma_req_idx = 1 - prtd->dma_req_idx;
70
71         addr = buf->addr + prtd->dma_pos;
72         prtd->dma_pos += dma_req->size;
73         if (prtd->dma_pos >= prtd->dma_pos_end)
74                 prtd->dma_pos = 0;
75
76         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
77                 dma_req->source_addr = addr;
78         else
79                 dma_req->dest_addr = addr;
80
81         tegra_dma_enqueue_req(prtd->dma_chan, dma_req);
82 }
83
84 static void dma_complete_callback(struct tegra_dma_req *req)
85 {
86         struct tegra_runtime_data *prtd = (struct tegra_runtime_data *)req->dev;
87         struct snd_pcm_substream *substream = prtd->substream;
88         struct snd_pcm_runtime *runtime = substream->runtime;
89
90         spin_lock(&prtd->lock);
91
92         if (!prtd->running) {
93                 spin_unlock(&prtd->lock);
94                 return;
95         }
96
97         if (++prtd->period_index >= runtime->periods)
98                 prtd->period_index = 0;
99
100         tegra_pcm_queue_dma(prtd);
101
102         spin_unlock(&prtd->lock);
103
104         snd_pcm_period_elapsed(substream);
105 }
106
107 static void setup_dma_tx_request(struct tegra_dma_req *req,
108                                         struct tegra_pcm_dma_params * dmap)
109 {
110         req->complete = dma_complete_callback;
111         req->to_memory = false;
112         req->dest_addr = dmap->addr;
113         req->dest_wrap = dmap->wrap;
114         req->source_bus_width = 32;
115         req->source_wrap = 0;
116         req->dest_bus_width = dmap->width;
117         req->req_sel = dmap->req_sel;
118 }
119
120 static void setup_dma_rx_request(struct tegra_dma_req *req,
121                                         struct tegra_pcm_dma_params * dmap)
122 {
123         req->complete = dma_complete_callback;
124         req->to_memory = true;
125         req->source_addr = dmap->addr;
126         req->dest_wrap = 0;
127         req->source_bus_width = dmap->width;
128         req->source_wrap = dmap->wrap;
129         req->dest_bus_width = 32;
130         req->req_sel = dmap->req_sel;
131 }
132
133 static int tegra_pcm_open(struct snd_pcm_substream *substream)
134 {
135         struct snd_pcm_runtime *runtime = substream->runtime;
136         struct tegra_runtime_data *prtd;
137         struct snd_soc_pcm_runtime *rtd = substream->private_data;
138         struct tegra_pcm_dma_params * dmap;
139         int ret = 0;
140
141         prtd = kzalloc(sizeof(struct tegra_runtime_data), GFP_KERNEL);
142         if (prtd == NULL)
143                 return -ENOMEM;
144
145         runtime->private_data = prtd;
146         prtd->substream = substream;
147
148         spin_lock_init(&prtd->lock);
149
150         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
151                 dmap = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
152                 setup_dma_tx_request(&prtd->dma_req[0], dmap);
153                 setup_dma_tx_request(&prtd->dma_req[1], dmap);
154         } else {
155                 dmap = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
156                 setup_dma_rx_request(&prtd->dma_req[0], dmap);
157                 setup_dma_rx_request(&prtd->dma_req[1], dmap);
158         }
159
160         prtd->dma_req[0].dev = prtd;
161         prtd->dma_req[1].dev = prtd;
162
163         prtd->dma_chan = tegra_dma_allocate_channel(
164                                 TEGRA_DMA_MODE_CONTINUOUS_SINGLE, "pcm");
165         if (prtd->dma_chan == NULL) {
166                 ret = -ENOMEM;
167                 goto err;
168         }
169
170         /* Set HW params now that initialization is complete */
171         snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware);
172
173         /* Ensure period size is multiple of 8 */
174         ret = snd_pcm_hw_constraint_step(runtime, 0,
175                 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 0x8);
176         if (ret < 0)
177                 goto err;
178
179         /* Ensure that buffer size is a multiple of period size */
180         ret = snd_pcm_hw_constraint_integer(runtime,
181                                                 SNDRV_PCM_HW_PARAM_PERIODS);
182         if (ret < 0)
183                 goto err;
184
185         return 0;
186
187 err:
188         if (prtd->dma_chan) {
189                 tegra_dma_free_channel(prtd->dma_chan);
190         }
191
192         kfree(prtd);
193
194         return ret;
195 }
196
197 static int tegra_pcm_close(struct snd_pcm_substream *substream)
198 {
199         struct snd_pcm_runtime *runtime = substream->runtime;
200         struct tegra_runtime_data *prtd = runtime->private_data;
201
202         tegra_dma_free_channel(prtd->dma_chan);
203
204         kfree(prtd);
205
206         return 0;
207 }
208
209 static int tegra_pcm_hw_params(struct snd_pcm_substream *substream,
210                                 struct snd_pcm_hw_params *params)
211 {
212         struct snd_pcm_runtime *runtime = substream->runtime;
213         struct tegra_runtime_data *prtd = runtime->private_data;
214
215         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
216
217         prtd->dma_req[0].size = params_period_bytes(params);
218         prtd->dma_req[1].size = prtd->dma_req[0].size;
219
220         return 0;
221 }
222
223 static int tegra_pcm_hw_free(struct snd_pcm_substream *substream)
224 {
225         snd_pcm_set_runtime_buffer(substream, NULL);
226
227         return 0;
228 }
229
230 static int tegra_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
231 {
232         struct snd_pcm_runtime *runtime = substream->runtime;
233         struct tegra_runtime_data *prtd = runtime->private_data;
234         unsigned long flags;
235
236         switch (cmd) {
237         case SNDRV_PCM_TRIGGER_START:
238                 prtd->dma_pos = 0;
239                 prtd->dma_pos_end = frames_to_bytes(runtime, runtime->periods * runtime->period_size);
240                 prtd->period_index = 0;
241                 prtd->dma_req_idx = 0;
242                 /* Fall-through */
243         case SNDRV_PCM_TRIGGER_RESUME:
244         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
245                 spin_lock_irqsave(&prtd->lock, flags);
246                 prtd->running = 1;
247                 spin_unlock_irqrestore(&prtd->lock, flags);
248                 tegra_pcm_queue_dma(prtd);
249                 tegra_pcm_queue_dma(prtd);
250                 break;
251         case SNDRV_PCM_TRIGGER_STOP:
252         case SNDRV_PCM_TRIGGER_SUSPEND:
253         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
254                 spin_lock_irqsave(&prtd->lock, flags);
255                 prtd->running = 0;
256                 spin_unlock_irqrestore(&prtd->lock, flags);
257                 tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req[0]);
258                 tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req[1]);
259                 break;
260         default:
261                 return -EINVAL;
262         }
263
264         return 0;
265 }
266
267 static snd_pcm_uframes_t tegra_pcm_pointer(struct snd_pcm_substream *substream)
268 {
269         struct snd_pcm_runtime *runtime = substream->runtime;
270         struct tegra_runtime_data *prtd = runtime->private_data;
271
272         return prtd->period_index * runtime->period_size;
273 }
274
275
276 static int tegra_pcm_mmap(struct snd_pcm_substream *substream,
277                                 struct vm_area_struct *vma)
278 {
279         struct snd_pcm_runtime *runtime = substream->runtime;
280
281         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
282                                         runtime->dma_area,
283                                         runtime->dma_addr,
284                                         runtime->dma_bytes);
285 }
286
287 static struct snd_pcm_ops tegra_pcm_ops = {
288         .open           = tegra_pcm_open,
289         .close          = tegra_pcm_close,
290         .ioctl          = snd_pcm_lib_ioctl,
291         .hw_params      = tegra_pcm_hw_params,
292         .hw_free        = tegra_pcm_hw_free,
293         .trigger        = tegra_pcm_trigger,
294         .pointer        = tegra_pcm_pointer,
295         .mmap           = tegra_pcm_mmap,
296 };
297
298 static int tegra_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
299 {
300         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
301         struct snd_dma_buffer *buf = &substream->dma_buffer;
302         size_t size = tegra_pcm_hardware.buffer_bytes_max;
303
304         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
305                                                 &buf->addr, GFP_KERNEL);
306         if (!buf->area)
307                 return -ENOMEM;
308
309         buf->dev.type = SNDRV_DMA_TYPE_DEV;
310         buf->dev.dev = pcm->card->dev;
311         buf->private_data = NULL;
312         buf->bytes = size;
313
314         return 0;
315 }
316
317 static void tegra_pcm_deallocate_dma_buffer(struct snd_pcm *pcm, int stream)
318 {
319         struct snd_pcm_substream *substream;
320         struct snd_dma_buffer *buf;
321
322         substream = pcm->streams[stream].substream;
323         if (!substream)
324                 return;
325
326         buf = &substream->dma_buffer;
327         if (!buf->area)
328                 return;
329
330         dma_free_writecombine(pcm->card->dev, buf->bytes,
331                                 buf->area, buf->addr);
332         buf->area = NULL;
333 }
334
335 static u64 tegra_dma_mask = DMA_BIT_MASK(32);
336
337 static int tegra_pcm_new(struct snd_soc_pcm_runtime *rtd)
338 {
339         struct snd_card *card = rtd->card->snd_card;
340         struct snd_soc_dai *dai = rtd->cpu_dai;
341         struct snd_pcm *pcm = rtd->pcm;
342         int ret = 0;
343
344         if (!card->dev->dma_mask)
345                 card->dev->dma_mask = &tegra_dma_mask;
346         if (!card->dev->coherent_dma_mask)
347                 card->dev->coherent_dma_mask = 0xffffffff;
348
349         if (dai->driver->playback.channels_min) {
350                 ret = tegra_pcm_preallocate_dma_buffer(pcm,
351                                                 SNDRV_PCM_STREAM_PLAYBACK);
352                 if (ret)
353                         goto err;
354         }
355
356         if (dai->driver->capture.channels_min) {
357                 ret = tegra_pcm_preallocate_dma_buffer(pcm,
358                                                 SNDRV_PCM_STREAM_CAPTURE);
359                 if (ret)
360                         goto err_free_play;
361         }
362
363         return 0;
364
365 err_free_play:
366         tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
367 err:
368         return ret;
369 }
370
371 static void tegra_pcm_free(struct snd_pcm *pcm)
372 {
373         tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE);
374         tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
375 }
376
377 struct snd_soc_platform_driver tegra_pcm_platform = {
378         .ops            = &tegra_pcm_ops,
379         .pcm_new        = tegra_pcm_new,
380         .pcm_free       = tegra_pcm_free,
381 };
382
383 static int __devinit tegra_pcm_platform_probe(struct platform_device *pdev)
384 {
385         return snd_soc_register_platform(&pdev->dev, &tegra_pcm_platform);
386 }
387
388 static int __devexit tegra_pcm_platform_remove(struct platform_device *pdev)
389 {
390         snd_soc_unregister_platform(&pdev->dev);
391         return 0;
392 }
393
394 static struct platform_driver tegra_pcm_driver = {
395         .driver = {
396                 .name = DRV_NAME,
397                 .owner = THIS_MODULE,
398         },
399         .probe = tegra_pcm_platform_probe,
400         .remove = __devexit_p(tegra_pcm_platform_remove),
401 };
402
403 static int __init snd_tegra_pcm_init(void)
404 {
405         return platform_driver_register(&tegra_pcm_driver);
406 }
407 module_init(snd_tegra_pcm_init);
408
409 static void __exit snd_tegra_pcm_exit(void)
410 {
411         platform_driver_unregister(&tegra_pcm_driver);
412 }
413 module_exit(snd_tegra_pcm_exit);
414
415 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
416 MODULE_DESCRIPTION("Tegra PCM ASoC driver");
417 MODULE_LICENSE("GPL");
418 MODULE_ALIAS("platform:" DRV_NAME);