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