Merge branch 'topic/asoc' into for-linus
[linux-2.6.git] / sound / soc / omap / omap-pcm.c
1 /*
2  * omap-pcm.c  --  ALSA PCM interface for the OMAP SoC
3  *
4  * Copyright (C) 2008 Nokia Corporation
5  *
6  * Contact: Jarkko Nikula <jhnikula@gmail.com>
7  *          Peter Ujfalusi <peter.ujfalusi@nokia.com>
8  *
9  * This program is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU General Public License
11  * version 2 as published by the Free Software Foundation.
12  *
13  * This program is distributed in the hope that it will be useful, but
14  * WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
21  * 02110-1301 USA
22  *
23  */
24
25 #include <linux/dma-mapping.h>
26 #include <linux/slab.h>
27 #include <sound/core.h>
28 #include <sound/pcm.h>
29 #include <sound/pcm_params.h>
30 #include <sound/soc.h>
31
32 #include <plat/dma.h>
33 #include "omap-pcm.h"
34
35 static const struct snd_pcm_hardware omap_pcm_hardware = {
36         .info                   = SNDRV_PCM_INFO_MMAP |
37                                   SNDRV_PCM_INFO_MMAP_VALID |
38                                   SNDRV_PCM_INFO_INTERLEAVED |
39                                   SNDRV_PCM_INFO_PAUSE |
40                                   SNDRV_PCM_INFO_RESUME,
41         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
42                                   SNDRV_PCM_FMTBIT_S32_LE,
43         .period_bytes_min       = 32,
44         .period_bytes_max       = 64 * 1024,
45         .periods_min            = 2,
46         .periods_max            = 255,
47         .buffer_bytes_max       = 128 * 1024,
48 };
49
50 struct omap_runtime_data {
51         spinlock_t                      lock;
52         struct omap_pcm_dma_data        *dma_data;
53         int                             dma_ch;
54         int                             period_index;
55 };
56
57 static void omap_pcm_dma_irq(int ch, u16 stat, void *data)
58 {
59         struct snd_pcm_substream *substream = data;
60         struct snd_pcm_runtime *runtime = substream->runtime;
61         struct omap_runtime_data *prtd = runtime->private_data;
62         unsigned long flags;
63
64         if ((cpu_is_omap1510())) {
65                 /*
66                  * OMAP1510 doesn't fully support DMA progress counter
67                  * and there is no software emulation implemented yet,
68                  * so have to maintain our own progress counters
69                  * that can be used by omap_pcm_pointer() instead.
70                  */
71                 spin_lock_irqsave(&prtd->lock, flags);
72                 if ((stat == OMAP_DMA_LAST_IRQ) &&
73                                 (prtd->period_index == runtime->periods - 1)) {
74                         /* we are in sync, do nothing */
75                         spin_unlock_irqrestore(&prtd->lock, flags);
76                         return;
77                 }
78                 if (prtd->period_index >= 0) {
79                         if (stat & OMAP_DMA_BLOCK_IRQ) {
80                                 /* end of buffer reached, loop back */
81                                 prtd->period_index = 0;
82                         } else if (stat & OMAP_DMA_LAST_IRQ) {
83                                 /* update the counter for the last period */
84                                 prtd->period_index = runtime->periods - 1;
85                         } else if (++prtd->period_index >= runtime->periods) {
86                                 /* end of buffer missed? loop back */
87                                 prtd->period_index = 0;
88                         }
89                 }
90                 spin_unlock_irqrestore(&prtd->lock, flags);
91         }
92
93         snd_pcm_period_elapsed(substream);
94 }
95
96 /* this may get called several times by oss emulation */
97 static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
98                               struct snd_pcm_hw_params *params)
99 {
100         struct snd_pcm_runtime *runtime = substream->runtime;
101         struct snd_soc_pcm_runtime *rtd = substream->private_data;
102         struct omap_runtime_data *prtd = runtime->private_data;
103         struct omap_pcm_dma_data *dma_data;
104         int err = 0;
105
106         dma_data = snd_soc_dai_get_dma_data(rtd->dai->cpu_dai, substream);
107
108         /* return if this is a bufferless transfer e.g.
109          * codec <--> BT codec or GSM modem -- lg FIXME */
110         if (!dma_data)
111                 return 0;
112
113         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
114         runtime->dma_bytes = params_buffer_bytes(params);
115
116         if (prtd->dma_data)
117                 return 0;
118         prtd->dma_data = dma_data;
119         err = omap_request_dma(dma_data->dma_req, dma_data->name,
120                                omap_pcm_dma_irq, substream, &prtd->dma_ch);
121         if (!err) {
122                 /*
123                  * Link channel with itself so DMA doesn't need any
124                  * reprogramming while looping the buffer
125                  */
126                 omap_dma_link_lch(prtd->dma_ch, prtd->dma_ch);
127         }
128
129         return err;
130 }
131
132 static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
133 {
134         struct snd_pcm_runtime *runtime = substream->runtime;
135         struct omap_runtime_data *prtd = runtime->private_data;
136
137         if (prtd->dma_data == NULL)
138                 return 0;
139
140         omap_dma_unlink_lch(prtd->dma_ch, prtd->dma_ch);
141         omap_free_dma(prtd->dma_ch);
142         prtd->dma_data = NULL;
143
144         snd_pcm_set_runtime_buffer(substream, NULL);
145
146         return 0;
147 }
148
149 static int omap_pcm_prepare(struct snd_pcm_substream *substream)
150 {
151         struct snd_pcm_runtime *runtime = substream->runtime;
152         struct omap_runtime_data *prtd = runtime->private_data;
153         struct omap_pcm_dma_data *dma_data = prtd->dma_data;
154         struct omap_dma_channel_params dma_params;
155         int bytes;
156
157         /* return if this is a bufferless transfer e.g.
158          * codec <--> BT codec or GSM modem -- lg FIXME */
159         if (!prtd->dma_data)
160                 return 0;
161
162         memset(&dma_params, 0, sizeof(dma_params));
163         dma_params.data_type                    = dma_data->data_type;
164         dma_params.trigger                      = dma_data->dma_req;
165         dma_params.sync_mode                    = dma_data->sync_mode;
166         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
167                 dma_params.src_amode            = OMAP_DMA_AMODE_POST_INC;
168                 dma_params.dst_amode            = OMAP_DMA_AMODE_CONSTANT;
169                 dma_params.src_or_dst_synch     = OMAP_DMA_DST_SYNC;
170                 dma_params.src_start            = runtime->dma_addr;
171                 dma_params.dst_start            = dma_data->port_addr;
172                 dma_params.dst_port             = OMAP_DMA_PORT_MPUI;
173                 dma_params.dst_fi               = dma_data->packet_size;
174         } else {
175                 dma_params.src_amode            = OMAP_DMA_AMODE_CONSTANT;
176                 dma_params.dst_amode            = OMAP_DMA_AMODE_POST_INC;
177                 dma_params.src_or_dst_synch     = OMAP_DMA_SRC_SYNC;
178                 dma_params.src_start            = dma_data->port_addr;
179                 dma_params.dst_start            = runtime->dma_addr;
180                 dma_params.src_port             = OMAP_DMA_PORT_MPUI;
181                 dma_params.src_fi               = dma_data->packet_size;
182         }
183         /*
184          * Set DMA transfer frame size equal to ALSA period size and frame
185          * count as no. of ALSA periods. Then with DMA frame interrupt enabled,
186          * we can transfer the whole ALSA buffer with single DMA transfer but
187          * still can get an interrupt at each period bounary
188          */
189         bytes = snd_pcm_lib_period_bytes(substream);
190         dma_params.elem_count   = bytes >> dma_data->data_type;
191         dma_params.frame_count  = runtime->periods;
192         omap_set_dma_params(prtd->dma_ch, &dma_params);
193
194         if ((cpu_is_omap1510()))
195                 omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ |
196                               OMAP_DMA_LAST_IRQ | OMAP_DMA_BLOCK_IRQ);
197         else
198                 omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ);
199
200         if (!(cpu_class_is_omap1())) {
201                 omap_set_dma_src_burst_mode(prtd->dma_ch,
202                                                 OMAP_DMA_DATA_BURST_16);
203                 omap_set_dma_dest_burst_mode(prtd->dma_ch,
204                                                 OMAP_DMA_DATA_BURST_16);
205         }
206
207         return 0;
208 }
209
210 static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
211 {
212         struct snd_pcm_runtime *runtime = substream->runtime;
213         struct omap_runtime_data *prtd = runtime->private_data;
214         struct omap_pcm_dma_data *dma_data = prtd->dma_data;
215         unsigned long flags;
216         int ret = 0;
217
218         spin_lock_irqsave(&prtd->lock, flags);
219         switch (cmd) {
220         case SNDRV_PCM_TRIGGER_START:
221         case SNDRV_PCM_TRIGGER_RESUME:
222         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
223                 prtd->period_index = 0;
224                 /* Configure McBSP internal buffer usage */
225                 if (dma_data->set_threshold)
226                         dma_data->set_threshold(substream);
227
228                 omap_start_dma(prtd->dma_ch);
229                 break;
230
231         case SNDRV_PCM_TRIGGER_STOP:
232         case SNDRV_PCM_TRIGGER_SUSPEND:
233         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
234                 prtd->period_index = -1;
235                 omap_stop_dma(prtd->dma_ch);
236                 break;
237         default:
238                 ret = -EINVAL;
239         }
240         spin_unlock_irqrestore(&prtd->lock, flags);
241
242         return ret;
243 }
244
245 static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
246 {
247         struct snd_pcm_runtime *runtime = substream->runtime;
248         struct omap_runtime_data *prtd = runtime->private_data;
249         dma_addr_t ptr;
250         snd_pcm_uframes_t offset;
251
252         if (cpu_is_omap1510()) {
253                 offset = prtd->period_index * runtime->period_size;
254         } else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
255                 ptr = omap_get_dma_dst_pos(prtd->dma_ch);
256                 offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
257         } else {
258                 ptr = omap_get_dma_src_pos(prtd->dma_ch);
259                 offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
260         }
261
262         if (offset >= runtime->buffer_size)
263                 offset = 0;
264
265         return offset;
266 }
267
268 static int omap_pcm_open(struct snd_pcm_substream *substream)
269 {
270         struct snd_pcm_runtime *runtime = substream->runtime;
271         struct omap_runtime_data *prtd;
272         int ret;
273
274         snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
275
276         /* Ensure that buffer size is a multiple of period size */
277         ret = snd_pcm_hw_constraint_integer(runtime,
278                                             SNDRV_PCM_HW_PARAM_PERIODS);
279         if (ret < 0)
280                 goto out;
281
282         prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
283         if (prtd == NULL) {
284                 ret = -ENOMEM;
285                 goto out;
286         }
287         spin_lock_init(&prtd->lock);
288         runtime->private_data = prtd;
289
290 out:
291         return ret;
292 }
293
294 static int omap_pcm_close(struct snd_pcm_substream *substream)
295 {
296         struct snd_pcm_runtime *runtime = substream->runtime;
297
298         kfree(runtime->private_data);
299         return 0;
300 }
301
302 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
303         struct vm_area_struct *vma)
304 {
305         struct snd_pcm_runtime *runtime = substream->runtime;
306
307         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
308                                      runtime->dma_area,
309                                      runtime->dma_addr,
310                                      runtime->dma_bytes);
311 }
312
313 static struct snd_pcm_ops omap_pcm_ops = {
314         .open           = omap_pcm_open,
315         .close          = omap_pcm_close,
316         .ioctl          = snd_pcm_lib_ioctl,
317         .hw_params      = omap_pcm_hw_params,
318         .hw_free        = omap_pcm_hw_free,
319         .prepare        = omap_pcm_prepare,
320         .trigger        = omap_pcm_trigger,
321         .pointer        = omap_pcm_pointer,
322         .mmap           = omap_pcm_mmap,
323 };
324
325 static u64 omap_pcm_dmamask = DMA_BIT_MASK(64);
326
327 static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
328         int stream)
329 {
330         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
331         struct snd_dma_buffer *buf = &substream->dma_buffer;
332         size_t size = omap_pcm_hardware.buffer_bytes_max;
333
334         buf->dev.type = SNDRV_DMA_TYPE_DEV;
335         buf->dev.dev = pcm->card->dev;
336         buf->private_data = NULL;
337         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
338                                            &buf->addr, GFP_KERNEL);
339         if (!buf->area)
340                 return -ENOMEM;
341
342         buf->bytes = size;
343         return 0;
344 }
345
346 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
347 {
348         struct snd_pcm_substream *substream;
349         struct snd_dma_buffer *buf;
350         int stream;
351
352         for (stream = 0; stream < 2; stream++) {
353                 substream = pcm->streams[stream].substream;
354                 if (!substream)
355                         continue;
356
357                 buf = &substream->dma_buffer;
358                 if (!buf->area)
359                         continue;
360
361                 dma_free_writecombine(pcm->card->dev, buf->bytes,
362                                       buf->area, buf->addr);
363                 buf->area = NULL;
364         }
365 }
366
367 static int omap_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
368                  struct snd_pcm *pcm)
369 {
370         int ret = 0;
371
372         if (!card->dev->dma_mask)
373                 card->dev->dma_mask = &omap_pcm_dmamask;
374         if (!card->dev->coherent_dma_mask)
375                 card->dev->coherent_dma_mask = DMA_BIT_MASK(64);
376
377         if (dai->playback.channels_min) {
378                 ret = omap_pcm_preallocate_dma_buffer(pcm,
379                         SNDRV_PCM_STREAM_PLAYBACK);
380                 if (ret)
381                         goto out;
382         }
383
384         if (dai->capture.channels_min) {
385                 ret = omap_pcm_preallocate_dma_buffer(pcm,
386                         SNDRV_PCM_STREAM_CAPTURE);
387                 if (ret)
388                         goto out;
389         }
390
391 out:
392         return ret;
393 }
394
395 struct snd_soc_platform omap_soc_platform = {
396         .name           = "omap-pcm-audio",
397         .pcm_ops        = &omap_pcm_ops,
398         .pcm_new        = omap_pcm_new,
399         .pcm_free       = omap_pcm_free_dma_buffers,
400 };
401 EXPORT_SYMBOL_GPL(omap_soc_platform);
402
403 static int __init omap_soc_platform_init(void)
404 {
405         return snd_soc_register_platform(&omap_soc_platform);
406 }
407 module_init(omap_soc_platform_init);
408
409 static void __exit omap_soc_platform_exit(void)
410 {
411         snd_soc_unregister_platform(&omap_soc_platform);
412 }
413 module_exit(omap_soc_platform_exit);
414
415 MODULE_AUTHOR("Jarkko Nikula <jhnikula@gmail.com>");
416 MODULE_DESCRIPTION("OMAP PCM DMA module");
417 MODULE_LICENSE("GPL");