ASoC: OMAP: Don't try to set unsupported OMAP_DMA_DATA_BURST_16 on OMAP1
[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 <sound/core.h>
27 #include <sound/pcm.h>
28 #include <sound/pcm_params.h>
29 #include <sound/soc.h>
30
31 #include <mach/dma.h>
32 #include "omap-pcm.h"
33
34 static const struct snd_pcm_hardware omap_pcm_hardware = {
35         .info                   = SNDRV_PCM_INFO_MMAP |
36                                   SNDRV_PCM_INFO_MMAP_VALID |
37                                   SNDRV_PCM_INFO_INTERLEAVED |
38                                   SNDRV_PCM_INFO_PAUSE |
39                                   SNDRV_PCM_INFO_RESUME,
40         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
41         .period_bytes_min       = 32,
42         .period_bytes_max       = 64 * 1024,
43         .periods_min            = 2,
44         .periods_max            = 255,
45         .buffer_bytes_max       = 128 * 1024,
46 };
47
48 struct omap_runtime_data {
49         spinlock_t                      lock;
50         struct omap_pcm_dma_data        *dma_data;
51         int                             dma_ch;
52         int                             period_index;
53 };
54
55 static void omap_pcm_dma_irq(int ch, u16 stat, void *data)
56 {
57         struct snd_pcm_substream *substream = data;
58         struct snd_pcm_runtime *runtime = substream->runtime;
59         struct omap_runtime_data *prtd = runtime->private_data;
60         unsigned long flags;
61
62         if ((cpu_is_omap1510()) &&
63                         (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)) {
64                 /*
65                  * OMAP1510 doesn't fully support DMA progress counter
66                  * and there is no software emulation implemented yet,
67                  * so have to maintain our own playback progress counter
68                  * that can be used by omap_pcm_pointer() instead.
69                  */
70                 spin_lock_irqsave(&prtd->lock, flags);
71                 if ((stat == OMAP_DMA_LAST_IRQ) &&
72                                 (prtd->period_index == runtime->periods - 1)) {
73                         /* we are in sync, do nothing */
74                         spin_unlock_irqrestore(&prtd->lock, flags);
75                         return;
76                 }
77                 if (prtd->period_index >= 0) {
78                         if (stat & OMAP_DMA_BLOCK_IRQ) {
79                                 /* end of buffer reached, loop back */
80                                 prtd->period_index = 0;
81                         } else if (stat & OMAP_DMA_LAST_IRQ) {
82                                 /* update the counter for the last period */
83                                 prtd->period_index = runtime->periods - 1;
84                         } else if (++prtd->period_index >= runtime->periods) {
85                                 /* end of buffer missed? loop back */
86                                 prtd->period_index = 0;
87                         }
88                 }
89                 spin_unlock_irqrestore(&prtd->lock, flags);
90         }
91
92         snd_pcm_period_elapsed(substream);
93 }
94
95 /* this may get called several times by oss emulation */
96 static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
97                               struct snd_pcm_hw_params *params)
98 {
99         struct snd_pcm_runtime *runtime = substream->runtime;
100         struct snd_soc_pcm_runtime *rtd = substream->private_data;
101         struct omap_runtime_data *prtd = runtime->private_data;
102         struct omap_pcm_dma_data *dma_data = rtd->dai->cpu_dai->dma_data;
103         int err = 0;
104
105         /* return if this is a bufferless transfer e.g.
106          * codec <--> BT codec or GSM modem -- lg FIXME */
107         if (!dma_data)
108                 return 0;
109
110         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
111         runtime->dma_bytes = params_buffer_bytes(params);
112
113         if (prtd->dma_data)
114                 return 0;
115         prtd->dma_data = dma_data;
116         err = omap_request_dma(dma_data->dma_req, dma_data->name,
117                                omap_pcm_dma_irq, substream, &prtd->dma_ch);
118         if (!err) {
119                 /*
120                  * Link channel with itself so DMA doesn't need any
121                  * reprogramming while looping the buffer
122                  */
123                 omap_dma_link_lch(prtd->dma_ch, prtd->dma_ch);
124         }
125
126         return err;
127 }
128
129 static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
130 {
131         struct snd_pcm_runtime *runtime = substream->runtime;
132         struct omap_runtime_data *prtd = runtime->private_data;
133
134         if (prtd->dma_data == NULL)
135                 return 0;
136
137         omap_dma_unlink_lch(prtd->dma_ch, prtd->dma_ch);
138         omap_free_dma(prtd->dma_ch);
139         prtd->dma_data = NULL;
140
141         snd_pcm_set_runtime_buffer(substream, NULL);
142
143         return 0;
144 }
145
146 static int omap_pcm_prepare(struct snd_pcm_substream *substream)
147 {
148         struct snd_pcm_runtime *runtime = substream->runtime;
149         struct omap_runtime_data *prtd = runtime->private_data;
150         struct omap_pcm_dma_data *dma_data = prtd->dma_data;
151         struct omap_dma_channel_params dma_params;
152
153         /* return if this is a bufferless transfer e.g.
154          * codec <--> BT codec or GSM modem -- lg FIXME */
155         if (!prtd->dma_data)
156                 return 0;
157
158         memset(&dma_params, 0, sizeof(dma_params));
159         /*
160          * Note: Regardless of interface data formats supported by OMAP McBSP
161          * or EAC blocks, internal representation is always fixed 16-bit/sample
162          */
163         dma_params.data_type                    = OMAP_DMA_DATA_TYPE_S16;
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         } else {
174                 dma_params.src_amode            = OMAP_DMA_AMODE_CONSTANT;
175                 dma_params.dst_amode            = OMAP_DMA_AMODE_POST_INC;
176                 dma_params.src_or_dst_synch     = OMAP_DMA_SRC_SYNC;
177                 dma_params.src_start            = dma_data->port_addr;
178                 dma_params.dst_start            = runtime->dma_addr;
179                 dma_params.src_port             = OMAP_DMA_PORT_MPUI;
180         }
181         /*
182          * Set DMA transfer frame size equal to ALSA period size and frame
183          * count as no. of ALSA periods. Then with DMA frame interrupt enabled,
184          * we can transfer the whole ALSA buffer with single DMA transfer but
185          * still can get an interrupt at each period bounary
186          */
187         dma_params.elem_count   = snd_pcm_lib_period_bytes(substream) / 2;
188         dma_params.frame_count  = runtime->periods;
189         omap_set_dma_params(prtd->dma_ch, &dma_params);
190
191         if ((cpu_is_omap1510()) &&
192                         (substream->stream == SNDRV_PCM_STREAM_PLAYBACK))
193                 omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ |
194                               OMAP_DMA_LAST_IRQ | OMAP_DMA_BLOCK_IRQ);
195         else
196                 omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ);
197
198         if (!(cpu_class_is_omap1())) {
199                 omap_set_dma_src_burst_mode(prtd->dma_ch,
200                                                 OMAP_DMA_DATA_BURST_16);
201                 omap_set_dma_dest_burst_mode(prtd->dma_ch,
202                                                 OMAP_DMA_DATA_BURST_16);
203         }
204
205         return 0;
206 }
207
208 static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
209 {
210         struct snd_pcm_runtime *runtime = substream->runtime;
211         struct omap_runtime_data *prtd = runtime->private_data;
212         struct omap_pcm_dma_data *dma_data = prtd->dma_data;
213         unsigned long flags;
214         int ret = 0;
215
216         spin_lock_irqsave(&prtd->lock, flags);
217         switch (cmd) {
218         case SNDRV_PCM_TRIGGER_START:
219         case SNDRV_PCM_TRIGGER_RESUME:
220         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
221                 prtd->period_index = 0;
222                 /* Configure McBSP internal buffer usage */
223                 if (dma_data->set_threshold)
224                         dma_data->set_threshold(substream);
225
226                 omap_start_dma(prtd->dma_ch);
227                 break;
228
229         case SNDRV_PCM_TRIGGER_STOP:
230         case SNDRV_PCM_TRIGGER_SUSPEND:
231         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
232                 prtd->period_index = -1;
233                 omap_stop_dma(prtd->dma_ch);
234                 break;
235         default:
236                 ret = -EINVAL;
237         }
238         spin_unlock_irqrestore(&prtd->lock, flags);
239
240         return ret;
241 }
242
243 static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
244 {
245         struct snd_pcm_runtime *runtime = substream->runtime;
246         struct omap_runtime_data *prtd = runtime->private_data;
247         dma_addr_t ptr;
248         snd_pcm_uframes_t offset;
249
250         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
251                 ptr = omap_get_dma_dst_pos(prtd->dma_ch);
252                 offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
253         } else if (!(cpu_is_omap1510())) {
254                 ptr = omap_get_dma_src_pos(prtd->dma_ch);
255                 offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
256         } else
257                 offset = prtd->period_index * runtime->period_size;
258
259         if (offset >= runtime->buffer_size)
260                 offset = 0;
261
262         return offset;
263 }
264
265 static int omap_pcm_open(struct snd_pcm_substream *substream)
266 {
267         struct snd_pcm_runtime *runtime = substream->runtime;
268         struct omap_runtime_data *prtd;
269         int ret;
270
271         snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
272
273         /* Ensure that buffer size is a multiple of period size */
274         ret = snd_pcm_hw_constraint_integer(runtime,
275                                             SNDRV_PCM_HW_PARAM_PERIODS);
276         if (ret < 0)
277                 goto out;
278
279         prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
280         if (prtd == NULL) {
281                 ret = -ENOMEM;
282                 goto out;
283         }
284         spin_lock_init(&prtd->lock);
285         runtime->private_data = prtd;
286
287 out:
288         return ret;
289 }
290
291 static int omap_pcm_close(struct snd_pcm_substream *substream)
292 {
293         struct snd_pcm_runtime *runtime = substream->runtime;
294
295         kfree(runtime->private_data);
296         return 0;
297 }
298
299 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
300         struct vm_area_struct *vma)
301 {
302         struct snd_pcm_runtime *runtime = substream->runtime;
303
304         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
305                                      runtime->dma_area,
306                                      runtime->dma_addr,
307                                      runtime->dma_bytes);
308 }
309
310 static struct snd_pcm_ops omap_pcm_ops = {
311         .open           = omap_pcm_open,
312         .close          = omap_pcm_close,
313         .ioctl          = snd_pcm_lib_ioctl,
314         .hw_params      = omap_pcm_hw_params,
315         .hw_free        = omap_pcm_hw_free,
316         .prepare        = omap_pcm_prepare,
317         .trigger        = omap_pcm_trigger,
318         .pointer        = omap_pcm_pointer,
319         .mmap           = omap_pcm_mmap,
320 };
321
322 static u64 omap_pcm_dmamask = DMA_BIT_MASK(64);
323
324 static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
325         int stream)
326 {
327         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
328         struct snd_dma_buffer *buf = &substream->dma_buffer;
329         size_t size = omap_pcm_hardware.buffer_bytes_max;
330
331         buf->dev.type = SNDRV_DMA_TYPE_DEV;
332         buf->dev.dev = pcm->card->dev;
333         buf->private_data = NULL;
334         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
335                                            &buf->addr, GFP_KERNEL);
336         if (!buf->area)
337                 return -ENOMEM;
338
339         buf->bytes = size;
340         return 0;
341 }
342
343 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
344 {
345         struct snd_pcm_substream *substream;
346         struct snd_dma_buffer *buf;
347         int stream;
348
349         for (stream = 0; stream < 2; stream++) {
350                 substream = pcm->streams[stream].substream;
351                 if (!substream)
352                         continue;
353
354                 buf = &substream->dma_buffer;
355                 if (!buf->area)
356                         continue;
357
358                 dma_free_writecombine(pcm->card->dev, buf->bytes,
359                                       buf->area, buf->addr);
360                 buf->area = NULL;
361         }
362 }
363
364 static int omap_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
365                  struct snd_pcm *pcm)
366 {
367         int ret = 0;
368
369         if (!card->dev->dma_mask)
370                 card->dev->dma_mask = &omap_pcm_dmamask;
371         if (!card->dev->coherent_dma_mask)
372                 card->dev->coherent_dma_mask = DMA_BIT_MASK(64);
373
374         if (dai->playback.channels_min) {
375                 ret = omap_pcm_preallocate_dma_buffer(pcm,
376                         SNDRV_PCM_STREAM_PLAYBACK);
377                 if (ret)
378                         goto out;
379         }
380
381         if (dai->capture.channels_min) {
382                 ret = omap_pcm_preallocate_dma_buffer(pcm,
383                         SNDRV_PCM_STREAM_CAPTURE);
384                 if (ret)
385                         goto out;
386         }
387
388 out:
389         return ret;
390 }
391
392 struct snd_soc_platform omap_soc_platform = {
393         .name           = "omap-pcm-audio",
394         .pcm_ops        = &omap_pcm_ops,
395         .pcm_new        = omap_pcm_new,
396         .pcm_free       = omap_pcm_free_dma_buffers,
397 };
398 EXPORT_SYMBOL_GPL(omap_soc_platform);
399
400 static int __init omap_soc_platform_init(void)
401 {
402         return snd_soc_register_platform(&omap_soc_platform);
403 }
404 module_init(omap_soc_platform_init);
405
406 static void __exit omap_soc_platform_exit(void)
407 {
408         snd_soc_unregister_platform(&omap_soc_platform);
409 }
410 module_exit(omap_soc_platform_exit);
411
412 MODULE_AUTHOR("Jarkko Nikula <jhnikula@gmail.com>");
413 MODULE_DESCRIPTION("OMAP PCM DMA module");
414 MODULE_LICENSE("GPL");