ALSA: ASoC: Blackfin: update SPORT0 port selector (v2)
[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 <jarkko.nikula@nokia.com>
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License
10  * version 2 as published by the Free Software Foundation.
11  *
12  * This program is distributed in the hope that it will be useful, but
13  * WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20  * 02110-1301 USA
21  *
22  */
23
24 #include <linux/dma-mapping.h>
25 #include <sound/core.h>
26 #include <sound/pcm.h>
27 #include <sound/pcm_params.h>
28 #include <sound/soc.h>
29
30 #include <mach/dma.h>
31 #include "omap-pcm.h"
32
33 static const struct snd_pcm_hardware omap_pcm_hardware = {
34         .info                   = SNDRV_PCM_INFO_MMAP |
35                                   SNDRV_PCM_INFO_MMAP_VALID |
36                                   SNDRV_PCM_INFO_INTERLEAVED |
37                                   SNDRV_PCM_INFO_PAUSE |
38                                   SNDRV_PCM_INFO_RESUME,
39         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
40         .period_bytes_min       = 32,
41         .period_bytes_max       = 64 * 1024,
42         .periods_min            = 2,
43         .periods_max            = 255,
44         .buffer_bytes_max       = 128 * 1024,
45 };
46
47 struct omap_runtime_data {
48         spinlock_t                      lock;
49         struct omap_pcm_dma_data        *dma_data;
50         int                             dma_ch;
51         int                             period_index;
52 };
53
54 static void omap_pcm_dma_irq(int ch, u16 stat, void *data)
55 {
56         struct snd_pcm_substream *substream = data;
57         struct snd_pcm_runtime *runtime = substream->runtime;
58         struct omap_runtime_data *prtd = runtime->private_data;
59         unsigned long flags;
60
61         if (cpu_is_omap1510()) {
62                 /*
63                  * OMAP1510 doesn't support DMA chaining so have to restart
64                  * the transfer after all periods are transferred
65                  */
66                 spin_lock_irqsave(&prtd->lock, flags);
67                 if (prtd->period_index >= 0) {
68                         if (++prtd->period_index == runtime->periods) {
69                                 prtd->period_index = 0;
70                                 omap_start_dma(prtd->dma_ch);
71                         }
72                 }
73                 spin_unlock_irqrestore(&prtd->lock, flags);
74         }
75
76         snd_pcm_period_elapsed(substream);
77 }
78
79 /* this may get called several times by oss emulation */
80 static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
81                               struct snd_pcm_hw_params *params)
82 {
83         struct snd_pcm_runtime *runtime = substream->runtime;
84         struct snd_soc_pcm_runtime *rtd = substream->private_data;
85         struct omap_runtime_data *prtd = runtime->private_data;
86         struct omap_pcm_dma_data *dma_data = rtd->dai->cpu_dai->dma_data;
87         int err = 0;
88
89         if (!dma_data)
90                 return -ENODEV;
91
92         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
93         runtime->dma_bytes = params_buffer_bytes(params);
94
95         if (prtd->dma_data)
96                 return 0;
97         prtd->dma_data = dma_data;
98         err = omap_request_dma(dma_data->dma_req, dma_data->name,
99                                omap_pcm_dma_irq, substream, &prtd->dma_ch);
100         if (!err & !cpu_is_omap1510()) {
101                 /*
102                  * Link channel with itself so DMA doesn't need any
103                  * reprogramming while looping the buffer
104                  */
105                 omap_dma_link_lch(prtd->dma_ch, prtd->dma_ch);
106         }
107
108         return err;
109 }
110
111 static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
112 {
113         struct snd_pcm_runtime *runtime = substream->runtime;
114         struct omap_runtime_data *prtd = runtime->private_data;
115
116         if (prtd->dma_data == NULL)
117                 return 0;
118
119         if (!cpu_is_omap1510())
120                 omap_dma_unlink_lch(prtd->dma_ch, prtd->dma_ch);
121         omap_free_dma(prtd->dma_ch);
122         prtd->dma_data = NULL;
123
124         snd_pcm_set_runtime_buffer(substream, NULL);
125
126         return 0;
127 }
128
129 static int omap_pcm_prepare(struct snd_pcm_substream *substream)
130 {
131         struct snd_pcm_runtime *runtime = substream->runtime;
132         struct omap_runtime_data *prtd = runtime->private_data;
133         struct omap_pcm_dma_data *dma_data = prtd->dma_data;
134         struct omap_dma_channel_params dma_params;
135
136         memset(&dma_params, 0, sizeof(dma_params));
137         /*
138          * Note: Regardless of interface data formats supported by OMAP McBSP
139          * or EAC blocks, internal representation is always fixed 16-bit/sample
140          */
141         dma_params.data_type                    = OMAP_DMA_DATA_TYPE_S16;
142         dma_params.trigger                      = dma_data->dma_req;
143         dma_params.sync_mode                    = OMAP_DMA_SYNC_ELEMENT;
144         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
145                 dma_params.src_amode            = OMAP_DMA_AMODE_POST_INC;
146                 dma_params.dst_amode            = OMAP_DMA_AMODE_CONSTANT;
147                 dma_params.src_or_dst_synch     = OMAP_DMA_DST_SYNC;
148                 dma_params.src_start            = runtime->dma_addr;
149                 dma_params.dst_start            = dma_data->port_addr;
150                 dma_params.dst_port             = OMAP_DMA_PORT_MPUI;
151         } else {
152                 dma_params.src_amode            = OMAP_DMA_AMODE_CONSTANT;
153                 dma_params.dst_amode            = OMAP_DMA_AMODE_POST_INC;
154                 dma_params.src_or_dst_synch     = OMAP_DMA_SRC_SYNC;
155                 dma_params.src_start            = dma_data->port_addr;
156                 dma_params.dst_start            = runtime->dma_addr;
157                 dma_params.src_port             = OMAP_DMA_PORT_MPUI;
158         }
159         /*
160          * Set DMA transfer frame size equal to ALSA period size and frame
161          * count as no. of ALSA periods. Then with DMA frame interrupt enabled,
162          * we can transfer the whole ALSA buffer with single DMA transfer but
163          * still can get an interrupt at each period bounary
164          */
165         dma_params.elem_count   = snd_pcm_lib_period_bytes(substream) / 2;
166         dma_params.frame_count  = runtime->periods;
167         omap_set_dma_params(prtd->dma_ch, &dma_params);
168
169         omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ);
170
171         return 0;
172 }
173
174 static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
175 {
176         struct snd_pcm_runtime *runtime = substream->runtime;
177         struct omap_runtime_data *prtd = runtime->private_data;
178         int ret = 0;
179
180         spin_lock_irq(&prtd->lock);
181         switch (cmd) {
182         case SNDRV_PCM_TRIGGER_START:
183         case SNDRV_PCM_TRIGGER_RESUME:
184         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
185                 prtd->period_index = 0;
186                 omap_start_dma(prtd->dma_ch);
187                 break;
188
189         case SNDRV_PCM_TRIGGER_STOP:
190         case SNDRV_PCM_TRIGGER_SUSPEND:
191         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
192                 prtd->period_index = -1;
193                 omap_stop_dma(prtd->dma_ch);
194                 break;
195         default:
196                 ret = -EINVAL;
197         }
198         spin_unlock_irq(&prtd->lock);
199
200         return ret;
201 }
202
203 static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
204 {
205         struct snd_pcm_runtime *runtime = substream->runtime;
206         struct omap_runtime_data *prtd = runtime->private_data;
207         dma_addr_t ptr;
208         snd_pcm_uframes_t offset;
209
210         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
211                 ptr = omap_get_dma_src_pos(prtd->dma_ch);
212         else
213                 ptr = omap_get_dma_dst_pos(prtd->dma_ch);
214
215         offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
216         if (offset >= runtime->buffer_size)
217                 offset = 0;
218
219         return offset;
220 }
221
222 static int omap_pcm_open(struct snd_pcm_substream *substream)
223 {
224         struct snd_pcm_runtime *runtime = substream->runtime;
225         struct omap_runtime_data *prtd;
226         int ret;
227
228         snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
229
230         /* Ensure that buffer size is a multiple of period size */
231         ret = snd_pcm_hw_constraint_integer(runtime,
232                                             SNDRV_PCM_HW_PARAM_PERIODS);
233         if (ret < 0)
234                 goto out;
235
236         prtd = kzalloc(sizeof(prtd), GFP_KERNEL);
237         if (prtd == NULL) {
238                 ret = -ENOMEM;
239                 goto out;
240         }
241         spin_lock_init(&prtd->lock);
242         runtime->private_data = prtd;
243
244 out:
245         return ret;
246 }
247
248 static int omap_pcm_close(struct snd_pcm_substream *substream)
249 {
250         struct snd_pcm_runtime *runtime = substream->runtime;
251
252         kfree(runtime->private_data);
253         return 0;
254 }
255
256 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
257         struct vm_area_struct *vma)
258 {
259         struct snd_pcm_runtime *runtime = substream->runtime;
260
261         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
262                                      runtime->dma_area,
263                                      runtime->dma_addr,
264                                      runtime->dma_bytes);
265 }
266
267 struct snd_pcm_ops omap_pcm_ops = {
268         .open           = omap_pcm_open,
269         .close          = omap_pcm_close,
270         .ioctl          = snd_pcm_lib_ioctl,
271         .hw_params      = omap_pcm_hw_params,
272         .hw_free        = omap_pcm_hw_free,
273         .prepare        = omap_pcm_prepare,
274         .trigger        = omap_pcm_trigger,
275         .pointer        = omap_pcm_pointer,
276         .mmap           = omap_pcm_mmap,
277 };
278
279 static u64 omap_pcm_dmamask = DMA_BIT_MASK(32);
280
281 static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
282         int stream)
283 {
284         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
285         struct snd_dma_buffer *buf = &substream->dma_buffer;
286         size_t size = omap_pcm_hardware.buffer_bytes_max;
287
288         buf->dev.type = SNDRV_DMA_TYPE_DEV;
289         buf->dev.dev = pcm->card->dev;
290         buf->private_data = NULL;
291         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
292                                            &buf->addr, GFP_KERNEL);
293         if (!buf->area)
294                 return -ENOMEM;
295
296         buf->bytes = size;
297         return 0;
298 }
299
300 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
301 {
302         struct snd_pcm_substream *substream;
303         struct snd_dma_buffer *buf;
304         int stream;
305
306         for (stream = 0; stream < 2; stream++) {
307                 substream = pcm->streams[stream].substream;
308                 if (!substream)
309                         continue;
310
311                 buf = &substream->dma_buffer;
312                 if (!buf->area)
313                         continue;
314
315                 dma_free_writecombine(pcm->card->dev, buf->bytes,
316                                       buf->area, buf->addr);
317                 buf->area = NULL;
318         }
319 }
320
321 int omap_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
322                  struct snd_pcm *pcm)
323 {
324         int ret = 0;
325
326         if (!card->dev->dma_mask)
327                 card->dev->dma_mask = &omap_pcm_dmamask;
328         if (!card->dev->coherent_dma_mask)
329                 card->dev->coherent_dma_mask = DMA_32BIT_MASK;
330
331         if (dai->playback.channels_min) {
332                 ret = omap_pcm_preallocate_dma_buffer(pcm,
333                         SNDRV_PCM_STREAM_PLAYBACK);
334                 if (ret)
335                         goto out;
336         }
337
338         if (dai->capture.channels_min) {
339                 ret = omap_pcm_preallocate_dma_buffer(pcm,
340                         SNDRV_PCM_STREAM_CAPTURE);
341                 if (ret)
342                         goto out;
343         }
344
345 out:
346         return ret;
347 }
348
349 struct snd_soc_platform omap_soc_platform = {
350         .name           = "omap-pcm-audio",
351         .pcm_ops        = &omap_pcm_ops,
352         .pcm_new        = omap_pcm_new,
353         .pcm_free       = omap_pcm_free_dma_buffers,
354 };
355 EXPORT_SYMBOL_GPL(omap_soc_platform);
356
357 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@nokia.com>");
358 MODULE_DESCRIPTION("OMAP PCM DMA module");
359 MODULE_LICENSE("GPL");