Revert "ASoC: Tegra: Acquire wake_lock during playback capture"
[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           = 1,
52         .channels_max           = 2,
53         .period_bytes_min       = 128,
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         dmap = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
151
152         if (dmap) {
153                 prtd->dma_req[0].dev = prtd;
154                 prtd->dma_req[1].dev = prtd;
155
156                 prtd->dma_chan = tegra_dma_allocate_channel(
157                                         TEGRA_DMA_MODE_CONTINUOUS_SINGLE,
158                                         "pcm");
159                 if (prtd->dma_chan == NULL) {
160                         ret = -ENOMEM;
161                         goto err;
162                 }
163         }
164
165         /* Set HW params now that initialization is complete */
166         snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware);
167
168         /* Ensure period size is multiple of 8 */
169         ret = snd_pcm_hw_constraint_step(runtime, 0,
170                 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 0x8);
171         if (ret < 0)
172                 goto err;
173
174         /* Ensure that buffer size is a multiple of period size */
175         ret = snd_pcm_hw_constraint_integer(runtime,
176                                                 SNDRV_PCM_HW_PARAM_PERIODS);
177         if (ret < 0)
178                 goto err;
179
180         return 0;
181
182 err:
183         if (prtd->dma_chan) {
184                 tegra_dma_free_channel(prtd->dma_chan);
185         }
186
187         kfree(prtd);
188
189         return ret;
190 }
191
192 static int tegra_pcm_close(struct snd_pcm_substream *substream)
193 {
194         struct snd_pcm_runtime *runtime = substream->runtime;
195         struct tegra_runtime_data *prtd = runtime->private_data;
196
197         if (prtd->dma_chan)
198                 tegra_dma_free_channel(prtd->dma_chan);
199
200         kfree(prtd);
201
202         return 0;
203 }
204
205 static int tegra_pcm_hw_params(struct snd_pcm_substream *substream,
206                                 struct snd_pcm_hw_params *params)
207 {
208         struct snd_pcm_runtime *runtime = substream->runtime;
209         struct tegra_runtime_data *prtd = runtime->private_data;
210         struct snd_soc_pcm_runtime *rtd = substream->private_data;
211         struct tegra_pcm_dma_params * dmap;
212
213         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
214
215         dmap = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
216         if (dmap) {
217                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
218                         setup_dma_tx_request(&prtd->dma_req[0], dmap);
219                         setup_dma_tx_request(&prtd->dma_req[1], dmap);
220                 } else {
221                         setup_dma_rx_request(&prtd->dma_req[0], dmap);
222                         setup_dma_rx_request(&prtd->dma_req[1], dmap);
223                 }
224         }
225         prtd->dma_req[0].size = params_period_bytes(params);
226         prtd->dma_req[1].size = prtd->dma_req[0].size;
227
228         return 0;
229 }
230
231 static int tegra_pcm_hw_free(struct snd_pcm_substream *substream)
232 {
233         snd_pcm_set_runtime_buffer(substream, NULL);
234
235         return 0;
236 }
237
238 static int tegra_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
239 {
240         struct snd_pcm_runtime *runtime = substream->runtime;
241         struct tegra_runtime_data *prtd = runtime->private_data;
242         unsigned long flags;
243
244         switch (cmd) {
245         case SNDRV_PCM_TRIGGER_START:
246                 prtd->dma_pos = 0;
247                 prtd->dma_pos_end = frames_to_bytes(runtime, runtime->periods * runtime->period_size);
248                 prtd->period_index = 0;
249                 prtd->dma_req_idx = 0;
250                 /* Fall-through */
251         case SNDRV_PCM_TRIGGER_RESUME:
252         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
253                 spin_lock_irqsave(&prtd->lock, flags);
254                 prtd->running = 1;
255                 spin_unlock_irqrestore(&prtd->lock, flags);
256                 tegra_pcm_queue_dma(prtd);
257                 tegra_pcm_queue_dma(prtd);
258                 break;
259         case SNDRV_PCM_TRIGGER_STOP:
260         case SNDRV_PCM_TRIGGER_SUSPEND:
261         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
262                 spin_lock_irqsave(&prtd->lock, flags);
263                 prtd->running = 0;
264                 spin_unlock_irqrestore(&prtd->lock, flags);
265                 tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req[0]);
266                 tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req[1]);
267                 break;
268         default:
269                 return -EINVAL;
270         }
271
272         return 0;
273 }
274
275 static snd_pcm_uframes_t tegra_pcm_pointer(struct snd_pcm_substream *substream)
276 {
277         struct snd_pcm_runtime *runtime = substream->runtime;
278         struct tegra_runtime_data *prtd = runtime->private_data;
279         int dma_transfer_count;
280
281         dma_transfer_count = tegra_dma_get_transfer_count(prtd->dma_chan,
282                                         &prtd->dma_req[prtd->dma_req_idx]);
283
284         return prtd->period_index * runtime->period_size +
285                 bytes_to_frames(runtime, dma_transfer_count);
286 }
287
288 static int tegra_pcm_mmap(struct snd_pcm_substream *substream,
289                                 struct vm_area_struct *vma)
290 {
291         struct snd_pcm_runtime *runtime = substream->runtime;
292
293         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
294                                         runtime->dma_area,
295                                         runtime->dma_addr,
296                                         runtime->dma_bytes);
297 }
298
299 static struct snd_pcm_ops tegra_pcm_ops = {
300         .open           = tegra_pcm_open,
301         .close          = tegra_pcm_close,
302         .ioctl          = snd_pcm_lib_ioctl,
303         .hw_params      = tegra_pcm_hw_params,
304         .hw_free        = tegra_pcm_hw_free,
305         .trigger        = tegra_pcm_trigger,
306         .pointer        = tegra_pcm_pointer,
307         .mmap           = tegra_pcm_mmap,
308 };
309
310 static int tegra_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
311 {
312         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
313         struct snd_dma_buffer *buf = &substream->dma_buffer;
314         size_t size = tegra_pcm_hardware.buffer_bytes_max;
315
316         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
317                                                 &buf->addr, GFP_KERNEL);
318         if (!buf->area)
319                 return -ENOMEM;
320
321         buf->dev.type = SNDRV_DMA_TYPE_DEV;
322         buf->dev.dev = pcm->card->dev;
323         buf->private_data = NULL;
324         buf->bytes = size;
325
326         return 0;
327 }
328
329 static void tegra_pcm_deallocate_dma_buffer(struct snd_pcm *pcm, int stream)
330 {
331         struct snd_pcm_substream *substream;
332         struct snd_dma_buffer *buf;
333
334         substream = pcm->streams[stream].substream;
335         if (!substream)
336                 return;
337
338         buf = &substream->dma_buffer;
339         if (!buf->area)
340                 return;
341
342         dma_free_writecombine(pcm->card->dev, buf->bytes,
343                                 buf->area, buf->addr);
344         buf->area = NULL;
345 }
346
347 static u64 tegra_dma_mask = DMA_BIT_MASK(32);
348
349 static int tegra_pcm_new(struct snd_soc_pcm_runtime *rtd)
350 {
351         struct snd_card *card = rtd->card->snd_card;
352         struct snd_pcm *pcm = rtd->pcm;
353         int ret = 0;
354
355         if (!card->dev->dma_mask)
356                 card->dev->dma_mask = &tegra_dma_mask;
357         if (!card->dev->coherent_dma_mask)
358                 card->dev->coherent_dma_mask = 0xffffffff;
359
360         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
361                 ret = tegra_pcm_preallocate_dma_buffer(pcm,
362                                                 SNDRV_PCM_STREAM_PLAYBACK);
363                 if (ret)
364                         goto err;
365         }
366
367         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
368                 ret = tegra_pcm_preallocate_dma_buffer(pcm,
369                                                 SNDRV_PCM_STREAM_CAPTURE);
370                 if (ret)
371                         goto err_free_play;
372         }
373
374         return 0;
375
376 err_free_play:
377         tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
378 err:
379         return ret;
380 }
381
382 static void tegra_pcm_free(struct snd_pcm *pcm)
383 {
384         tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE);
385         tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
386 }
387
388 static struct snd_soc_platform_driver tegra_pcm_platform = {
389         .ops            = &tegra_pcm_ops,
390         .pcm_new        = tegra_pcm_new,
391         .pcm_free       = tegra_pcm_free,
392 };
393
394 static int __devinit tegra_pcm_platform_probe(struct platform_device *pdev)
395 {
396         return snd_soc_register_platform(&pdev->dev, &tegra_pcm_platform);
397 }
398
399 static int __devexit tegra_pcm_platform_remove(struct platform_device *pdev)
400 {
401         snd_soc_unregister_platform(&pdev->dev);
402         return 0;
403 }
404
405 static struct platform_driver tegra_pcm_driver = {
406         .driver = {
407                 .name = DRV_NAME,
408                 .owner = THIS_MODULE,
409         },
410         .probe = tegra_pcm_platform_probe,
411         .remove = __devexit_p(tegra_pcm_platform_remove),
412 };
413 module_platform_driver(tegra_pcm_driver);
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);