OMAP: ASoC: Fix spinlock misuse in omap-pcm.c
[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         unsigned long flags;
179         int ret = 0;
180
181         spin_lock_irqsave(&prtd->lock, flags);
182         switch (cmd) {
183         case SNDRV_PCM_TRIGGER_START:
184         case SNDRV_PCM_TRIGGER_RESUME:
185         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
186                 prtd->period_index = 0;
187                 omap_start_dma(prtd->dma_ch);
188                 break;
189
190         case SNDRV_PCM_TRIGGER_STOP:
191         case SNDRV_PCM_TRIGGER_SUSPEND:
192         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
193                 prtd->period_index = -1;
194                 omap_stop_dma(prtd->dma_ch);
195                 break;
196         default:
197                 ret = -EINVAL;
198         }
199         spin_unlock_irqrestore(&prtd->lock, flags);
200
201         return ret;
202 }
203
204 static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
205 {
206         struct snd_pcm_runtime *runtime = substream->runtime;
207         struct omap_runtime_data *prtd = runtime->private_data;
208         dma_addr_t ptr;
209         snd_pcm_uframes_t offset;
210
211         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
212                 ptr = omap_get_dma_src_pos(prtd->dma_ch);
213         else
214                 ptr = omap_get_dma_dst_pos(prtd->dma_ch);
215
216         offset = bytes_to_frames(runtime, ptr - runtime->dma_addr);
217         if (offset >= runtime->buffer_size)
218                 offset = 0;
219
220         return offset;
221 }
222
223 static int omap_pcm_open(struct snd_pcm_substream *substream)
224 {
225         struct snd_pcm_runtime *runtime = substream->runtime;
226         struct omap_runtime_data *prtd;
227         int ret;
228
229         snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
230
231         /* Ensure that buffer size is a multiple of period size */
232         ret = snd_pcm_hw_constraint_integer(runtime,
233                                             SNDRV_PCM_HW_PARAM_PERIODS);
234         if (ret < 0)
235                 goto out;
236
237         prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
238         if (prtd == NULL) {
239                 ret = -ENOMEM;
240                 goto out;
241         }
242         spin_lock_init(&prtd->lock);
243         runtime->private_data = prtd;
244
245 out:
246         return ret;
247 }
248
249 static int omap_pcm_close(struct snd_pcm_substream *substream)
250 {
251         struct snd_pcm_runtime *runtime = substream->runtime;
252
253         kfree(runtime->private_data);
254         return 0;
255 }
256
257 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
258         struct vm_area_struct *vma)
259 {
260         struct snd_pcm_runtime *runtime = substream->runtime;
261
262         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
263                                      runtime->dma_area,
264                                      runtime->dma_addr,
265                                      runtime->dma_bytes);
266 }
267
268 struct snd_pcm_ops omap_pcm_ops = {
269         .open           = omap_pcm_open,
270         .close          = omap_pcm_close,
271         .ioctl          = snd_pcm_lib_ioctl,
272         .hw_params      = omap_pcm_hw_params,
273         .hw_free        = omap_pcm_hw_free,
274         .prepare        = omap_pcm_prepare,
275         .trigger        = omap_pcm_trigger,
276         .pointer        = omap_pcm_pointer,
277         .mmap           = omap_pcm_mmap,
278 };
279
280 static u64 omap_pcm_dmamask = DMA_BIT_MASK(32);
281
282 static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
283         int stream)
284 {
285         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
286         struct snd_dma_buffer *buf = &substream->dma_buffer;
287         size_t size = omap_pcm_hardware.buffer_bytes_max;
288
289         buf->dev.type = SNDRV_DMA_TYPE_DEV;
290         buf->dev.dev = pcm->card->dev;
291         buf->private_data = NULL;
292         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
293                                            &buf->addr, GFP_KERNEL);
294         if (!buf->area)
295                 return -ENOMEM;
296
297         buf->bytes = size;
298         return 0;
299 }
300
301 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
302 {
303         struct snd_pcm_substream *substream;
304         struct snd_dma_buffer *buf;
305         int stream;
306
307         for (stream = 0; stream < 2; stream++) {
308                 substream = pcm->streams[stream].substream;
309                 if (!substream)
310                         continue;
311
312                 buf = &substream->dma_buffer;
313                 if (!buf->area)
314                         continue;
315
316                 dma_free_writecombine(pcm->card->dev, buf->bytes,
317                                       buf->area, buf->addr);
318                 buf->area = NULL;
319         }
320 }
321
322 int omap_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
323                  struct snd_pcm *pcm)
324 {
325         int ret = 0;
326
327         if (!card->dev->dma_mask)
328                 card->dev->dma_mask = &omap_pcm_dmamask;
329         if (!card->dev->coherent_dma_mask)
330                 card->dev->coherent_dma_mask = DMA_32BIT_MASK;
331
332         if (dai->playback.channels_min) {
333                 ret = omap_pcm_preallocate_dma_buffer(pcm,
334                         SNDRV_PCM_STREAM_PLAYBACK);
335                 if (ret)
336                         goto out;
337         }
338
339         if (dai->capture.channels_min) {
340                 ret = omap_pcm_preallocate_dma_buffer(pcm,
341                         SNDRV_PCM_STREAM_CAPTURE);
342                 if (ret)
343                         goto out;
344         }
345
346 out:
347         return ret;
348 }
349
350 struct snd_soc_platform omap_soc_platform = {
351         .name           = "omap-pcm-audio",
352         .pcm_ops        = &omap_pcm_ops,
353         .pcm_new        = omap_pcm_new,
354         .pcm_free       = omap_pcm_free_dma_buffers,
355 };
356 EXPORT_SYMBOL_GPL(omap_soc_platform);
357
358 static int __init omap_soc_platform_init(void)
359 {
360         return snd_soc_register_platform(&omap_soc_platform);
361 }
362 module_init(omap_soc_platform_init);
363
364 static void __exit omap_soc_platform_exit(void)
365 {
366         snd_soc_unregister_platform(&omap_soc_platform);
367 }
368 module_exit(omap_soc_platform_exit);
369
370 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@nokia.com>");
371 MODULE_DESCRIPTION("OMAP PCM DMA module");
372 MODULE_LICENSE("GPL");