CHROMIUM: ASoC: Tegra: Double-buffer DMA in HW
[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 that buffer size is a multiple of period size */
174         ret = snd_pcm_hw_constraint_integer(runtime,
175                                                 SNDRV_PCM_HW_PARAM_PERIODS);
176         if (ret < 0)
177                 goto err;
178
179         return 0;
180
181 err:
182         if (prtd->dma_chan) {
183                 tegra_dma_free_channel(prtd->dma_chan);
184         }
185
186         kfree(prtd);
187
188         return ret;
189 }
190
191 static int tegra_pcm_close(struct snd_pcm_substream *substream)
192 {
193         struct snd_pcm_runtime *runtime = substream->runtime;
194         struct tegra_runtime_data *prtd = runtime->private_data;
195
196         tegra_dma_free_channel(prtd->dma_chan);
197
198         kfree(prtd);
199
200         return 0;
201 }
202
203 static int tegra_pcm_hw_params(struct snd_pcm_substream *substream,
204                                 struct snd_pcm_hw_params *params)
205 {
206         struct snd_pcm_runtime *runtime = substream->runtime;
207         struct tegra_runtime_data *prtd = runtime->private_data;
208
209         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
210
211         prtd->dma_req[0].size = params_period_bytes(params);
212         prtd->dma_req[1].size = prtd->dma_req[0].size;
213
214         return 0;
215 }
216
217 static int tegra_pcm_hw_free(struct snd_pcm_substream *substream)
218 {
219         snd_pcm_set_runtime_buffer(substream, NULL);
220
221         return 0;
222 }
223
224 static int tegra_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
225 {
226         struct snd_pcm_runtime *runtime = substream->runtime;
227         struct tegra_runtime_data *prtd = runtime->private_data;
228         unsigned long flags;
229
230         switch (cmd) {
231         case SNDRV_PCM_TRIGGER_START:
232                 prtd->dma_pos = 0;
233                 prtd->dma_pos_end = frames_to_bytes(runtime, runtime->periods * runtime->period_size);
234                 prtd->period_index = 0;
235                 prtd->dma_req_idx = 0;
236                 /* Fall-through */
237         case SNDRV_PCM_TRIGGER_RESUME:
238         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
239                 spin_lock_irqsave(&prtd->lock, flags);
240                 prtd->running = 1;
241                 spin_unlock_irqrestore(&prtd->lock, flags);
242                 tegra_pcm_queue_dma(prtd);
243                 tegra_pcm_queue_dma(prtd);
244                 break;
245         case SNDRV_PCM_TRIGGER_STOP:
246         case SNDRV_PCM_TRIGGER_SUSPEND:
247         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
248                 spin_lock_irqsave(&prtd->lock, flags);
249                 prtd->running = 0;
250                 spin_unlock_irqrestore(&prtd->lock, flags);
251                 tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req[0]);
252                 tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req[1]);
253                 break;
254         default:
255                 return -EINVAL;
256         }
257
258         return 0;
259 }
260
261 static snd_pcm_uframes_t tegra_pcm_pointer(struct snd_pcm_substream *substream)
262 {
263         struct snd_pcm_runtime *runtime = substream->runtime;
264         struct tegra_runtime_data *prtd = runtime->private_data;
265
266         return prtd->period_index * runtime->period_size;
267 }
268
269
270 static int tegra_pcm_mmap(struct snd_pcm_substream *substream,
271                                 struct vm_area_struct *vma)
272 {
273         struct snd_pcm_runtime *runtime = substream->runtime;
274
275         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
276                                         runtime->dma_area,
277                                         runtime->dma_addr,
278                                         runtime->dma_bytes);
279 }
280
281 static struct snd_pcm_ops tegra_pcm_ops = {
282         .open           = tegra_pcm_open,
283         .close          = tegra_pcm_close,
284         .ioctl          = snd_pcm_lib_ioctl,
285         .hw_params      = tegra_pcm_hw_params,
286         .hw_free        = tegra_pcm_hw_free,
287         .trigger        = tegra_pcm_trigger,
288         .pointer        = tegra_pcm_pointer,
289         .mmap           = tegra_pcm_mmap,
290 };
291
292 static int tegra_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
293 {
294         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
295         struct snd_dma_buffer *buf = &substream->dma_buffer;
296         size_t size = tegra_pcm_hardware.buffer_bytes_max;
297
298         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
299                                                 &buf->addr, GFP_KERNEL);
300         if (!buf->area)
301                 return -ENOMEM;
302
303         buf->dev.type = SNDRV_DMA_TYPE_DEV;
304         buf->dev.dev = pcm->card->dev;
305         buf->private_data = NULL;
306         buf->bytes = size;
307
308         return 0;
309 }
310
311 static void tegra_pcm_deallocate_dma_buffer(struct snd_pcm *pcm, int stream)
312 {
313         struct snd_pcm_substream *substream;
314         struct snd_dma_buffer *buf;
315
316         substream = pcm->streams[stream].substream;
317         if (!substream)
318                 return;
319
320         buf = &substream->dma_buffer;
321         if (!buf->area)
322                 return;
323
324         dma_free_writecombine(pcm->card->dev, buf->bytes,
325                                 buf->area, buf->addr);
326         buf->area = NULL;
327 }
328
329 static u64 tegra_dma_mask = DMA_BIT_MASK(32);
330
331 static int tegra_pcm_new(struct snd_soc_pcm_runtime *rtd)
332 {
333         struct snd_card *card = rtd->card->snd_card;
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 (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
343                 ret = tegra_pcm_preallocate_dma_buffer(pcm,
344                                                 SNDRV_PCM_STREAM_PLAYBACK);
345                 if (ret)
346                         goto err;
347         }
348
349         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
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);