Merge branch 'fix/asoc' into for-linus
[pandora-kernel.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                 /*
64                  * OMAP1510 doesn't support DMA chaining so have to restart
65                  * the transfer after all periods are transferred
66                  */
67                 spin_lock_irqsave(&prtd->lock, flags);
68                 if (prtd->period_index >= 0) {
69                         if (++prtd->period_index == runtime->periods) {
70                                 prtd->period_index = 0;
71                                 omap_start_dma(prtd->dma_ch);
72                         }
73                 }
74                 spin_unlock_irqrestore(&prtd->lock, flags);
75         }
76
77         snd_pcm_period_elapsed(substream);
78 }
79
80 /* this may get called several times by oss emulation */
81 static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
82                               struct snd_pcm_hw_params *params)
83 {
84         struct snd_pcm_runtime *runtime = substream->runtime;
85         struct snd_soc_pcm_runtime *rtd = substream->private_data;
86         struct omap_runtime_data *prtd = runtime->private_data;
87         struct omap_pcm_dma_data *dma_data = rtd->dai->cpu_dai->dma_data;
88         int err = 0;
89
90         if (!dma_data)
91                 return -ENODEV;
92
93         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
94         runtime->dma_bytes = params_buffer_bytes(params);
95
96         if (prtd->dma_data)
97                 return 0;
98         prtd->dma_data = dma_data;
99         err = omap_request_dma(dma_data->dma_req, dma_data->name,
100                                omap_pcm_dma_irq, substream, &prtd->dma_ch);
101         if (!err && !cpu_is_omap1510()) {
102                 /*
103                  * Link channel with itself so DMA doesn't need any
104                  * reprogramming while looping the buffer
105                  */
106                 omap_dma_link_lch(prtd->dma_ch, prtd->dma_ch);
107         }
108
109         return err;
110 }
111
112 static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
113 {
114         struct snd_pcm_runtime *runtime = substream->runtime;
115         struct omap_runtime_data *prtd = runtime->private_data;
116
117         if (prtd->dma_data == NULL)
118                 return 0;
119
120         if (!cpu_is_omap1510())
121                 omap_dma_unlink_lch(prtd->dma_ch, prtd->dma_ch);
122         omap_free_dma(prtd->dma_ch);
123         prtd->dma_data = NULL;
124
125         snd_pcm_set_runtime_buffer(substream, NULL);
126
127         return 0;
128 }
129
130 static int omap_pcm_prepare(struct snd_pcm_substream *substream)
131 {
132         struct snd_pcm_runtime *runtime = substream->runtime;
133         struct omap_runtime_data *prtd = runtime->private_data;
134         struct omap_pcm_dma_data *dma_data = prtd->dma_data;
135         struct omap_dma_channel_params dma_params;
136
137         memset(&dma_params, 0, sizeof(dma_params));
138         /*
139          * Note: Regardless of interface data formats supported by OMAP McBSP
140          * or EAC blocks, internal representation is always fixed 16-bit/sample
141          */
142         dma_params.data_type                    = OMAP_DMA_DATA_TYPE_S16;
143         dma_params.trigger                      = dma_data->dma_req;
144         dma_params.sync_mode                    = OMAP_DMA_SYNC_ELEMENT;
145         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
146                 dma_params.src_amode            = OMAP_DMA_AMODE_POST_INC;
147                 dma_params.dst_amode            = OMAP_DMA_AMODE_CONSTANT;
148                 dma_params.src_or_dst_synch     = OMAP_DMA_DST_SYNC;
149                 dma_params.src_start            = runtime->dma_addr;
150                 dma_params.dst_start            = dma_data->port_addr;
151                 dma_params.dst_port             = OMAP_DMA_PORT_MPUI;
152         } else {
153                 dma_params.src_amode            = OMAP_DMA_AMODE_CONSTANT;
154                 dma_params.dst_amode            = OMAP_DMA_AMODE_POST_INC;
155                 dma_params.src_or_dst_synch     = OMAP_DMA_SRC_SYNC;
156                 dma_params.src_start            = dma_data->port_addr;
157                 dma_params.dst_start            = runtime->dma_addr;
158                 dma_params.src_port             = OMAP_DMA_PORT_MPUI;
159         }
160         /*
161          * Set DMA transfer frame size equal to ALSA period size and frame
162          * count as no. of ALSA periods. Then with DMA frame interrupt enabled,
163          * we can transfer the whole ALSA buffer with single DMA transfer but
164          * still can get an interrupt at each period bounary
165          */
166         dma_params.elem_count   = snd_pcm_lib_period_bytes(substream) / 2;
167         dma_params.frame_count  = runtime->periods;
168         omap_set_dma_params(prtd->dma_ch, &dma_params);
169
170         omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ);
171
172         return 0;
173 }
174
175 static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
176 {
177         struct snd_pcm_runtime *runtime = substream->runtime;
178         struct omap_runtime_data *prtd = runtime->private_data;
179         unsigned long flags;
180         int ret = 0;
181
182         spin_lock_irqsave(&prtd->lock, flags);
183         switch (cmd) {
184         case SNDRV_PCM_TRIGGER_START:
185         case SNDRV_PCM_TRIGGER_RESUME:
186         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
187                 prtd->period_index = 0;
188                 omap_start_dma(prtd->dma_ch);
189                 break;
190
191         case SNDRV_PCM_TRIGGER_STOP:
192         case SNDRV_PCM_TRIGGER_SUSPEND:
193         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
194                 prtd->period_index = -1;
195                 omap_stop_dma(prtd->dma_ch);
196                 break;
197         default:
198                 ret = -EINVAL;
199         }
200         spin_unlock_irqrestore(&prtd->lock, flags);
201
202         return ret;
203 }
204
205 static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
206 {
207         struct snd_pcm_runtime *runtime = substream->runtime;
208         struct omap_runtime_data *prtd = runtime->private_data;
209         dma_addr_t ptr;
210         snd_pcm_uframes_t offset;
211
212         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
213                 ptr = omap_get_dma_src_pos(prtd->dma_ch);
214         else
215                 ptr = omap_get_dma_dst_pos(prtd->dma_ch);
216
217         offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
218         if (offset >= runtime->buffer_size)
219                 offset = 0;
220
221         return offset;
222 }
223
224 static int omap_pcm_open(struct snd_pcm_substream *substream)
225 {
226         struct snd_pcm_runtime *runtime = substream->runtime;
227         struct omap_runtime_data *prtd;
228         int ret;
229
230         snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
231
232         /* Ensure that buffer size is a multiple of period size */
233         ret = snd_pcm_hw_constraint_integer(runtime,
234                                             SNDRV_PCM_HW_PARAM_PERIODS);
235         if (ret < 0)
236                 goto out;
237
238         prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
239         if (prtd == NULL) {
240                 ret = -ENOMEM;
241                 goto out;
242         }
243         spin_lock_init(&prtd->lock);
244         runtime->private_data = prtd;
245
246 out:
247         return ret;
248 }
249
250 static int omap_pcm_close(struct snd_pcm_substream *substream)
251 {
252         struct snd_pcm_runtime *runtime = substream->runtime;
253
254         kfree(runtime->private_data);
255         return 0;
256 }
257
258 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
259         struct vm_area_struct *vma)
260 {
261         struct snd_pcm_runtime *runtime = substream->runtime;
262
263         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
264                                      runtime->dma_area,
265                                      runtime->dma_addr,
266                                      runtime->dma_bytes);
267 }
268
269 static struct snd_pcm_ops omap_pcm_ops = {
270         .open           = omap_pcm_open,
271         .close          = omap_pcm_close,
272         .ioctl          = snd_pcm_lib_ioctl,
273         .hw_params      = omap_pcm_hw_params,
274         .hw_free        = omap_pcm_hw_free,
275         .prepare        = omap_pcm_prepare,
276         .trigger        = omap_pcm_trigger,
277         .pointer        = omap_pcm_pointer,
278         .mmap           = omap_pcm_mmap,
279 };
280
281 static u64 omap_pcm_dmamask = DMA_BIT_MASK(32);
282
283 static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
284         int stream)
285 {
286         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
287         struct snd_dma_buffer *buf = &substream->dma_buffer;
288         size_t size = omap_pcm_hardware.buffer_bytes_max;
289
290         buf->dev.type = SNDRV_DMA_TYPE_DEV;
291         buf->dev.dev = pcm->card->dev;
292         buf->private_data = NULL;
293         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
294                                            &buf->addr, GFP_KERNEL);
295         if (!buf->area)
296                 return -ENOMEM;
297
298         buf->bytes = size;
299         return 0;
300 }
301
302 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
303 {
304         struct snd_pcm_substream *substream;
305         struct snd_dma_buffer *buf;
306         int stream;
307
308         for (stream = 0; stream < 2; stream++) {
309                 substream = pcm->streams[stream].substream;
310                 if (!substream)
311                         continue;
312
313                 buf = &substream->dma_buffer;
314                 if (!buf->area)
315                         continue;
316
317                 dma_free_writecombine(pcm->card->dev, buf->bytes,
318                                       buf->area, buf->addr);
319                 buf->area = NULL;
320         }
321 }
322
323 int omap_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
324                  struct snd_pcm *pcm)
325 {
326         int ret = 0;
327
328         if (!card->dev->dma_mask)
329                 card->dev->dma_mask = &omap_pcm_dmamask;
330         if (!card->dev->coherent_dma_mask)
331                 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
332
333         if (dai->playback.channels_min) {
334                 ret = omap_pcm_preallocate_dma_buffer(pcm,
335                         SNDRV_PCM_STREAM_PLAYBACK);
336                 if (ret)
337                         goto out;
338         }
339
340         if (dai->capture.channels_min) {
341                 ret = omap_pcm_preallocate_dma_buffer(pcm,
342                         SNDRV_PCM_STREAM_CAPTURE);
343                 if (ret)
344                         goto out;
345         }
346
347 out:
348         return ret;
349 }
350
351 struct snd_soc_platform omap_soc_platform = {
352         .name           = "omap-pcm-audio",
353         .pcm_ops        = &omap_pcm_ops,
354         .pcm_new        = omap_pcm_new,
355         .pcm_free       = omap_pcm_free_dma_buffers,
356 };
357 EXPORT_SYMBOL_GPL(omap_soc_platform);
358
359 static int __init omap_soc_platform_init(void)
360 {
361         return snd_soc_register_platform(&omap_soc_platform);
362 }
363 module_init(omap_soc_platform_init);
364
365 static void __exit omap_soc_platform_exit(void)
366 {
367         snd_soc_unregister_platform(&omap_soc_platform);
368 }
369 module_exit(omap_soc_platform_exit);
370
371 MODULE_AUTHOR("Jarkko Nikula <jhnikula@gmail.com>");
372 MODULE_DESCRIPTION("OMAP PCM DMA module");
373 MODULE_LICENSE("GPL");