ASoC: samsung: WM8994 depends on MFD_WM8994
[linux-2.6.git] / sound / soc / samsung / dma.c
1 /*
2  * dma.c  --  ALSA Soc Audio Layer
3  *
4  * (c) 2006 Wolfson Microelectronics PLC.
5  * Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
6  *
7  * Copyright 2004-2005 Simtec Electronics
8  *      http://armlinux.simtec.co.uk/
9  *      Ben Dooks <ben@simtec.co.uk>
10  *
11  *  This program is free software; you can redistribute  it and/or modify it
12  *  under  the terms of  the GNU General  Public License as published by the
13  *  Free Software Foundation;  either version 2 of the  License, or (at your
14  *  option) any later version.
15  */
16
17 #include <linux/slab.h>
18 #include <linux/dma-mapping.h>
19
20 #include <sound/soc.h>
21 #include <sound/pcm_params.h>
22
23 #include <asm/dma.h>
24 #include <mach/hardware.h>
25 #include <mach/dma.h>
26
27 #include "dma.h"
28
29 #define ST_RUNNING              (1<<0)
30 #define ST_OPENED               (1<<1)
31
32 static const struct snd_pcm_hardware dma_hardware = {
33         .info                   = SNDRV_PCM_INFO_INTERLEAVED |
34                                     SNDRV_PCM_INFO_BLOCK_TRANSFER |
35                                     SNDRV_PCM_INFO_MMAP |
36                                     SNDRV_PCM_INFO_MMAP_VALID |
37                                     SNDRV_PCM_INFO_PAUSE |
38                                     SNDRV_PCM_INFO_RESUME,
39         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
40                                     SNDRV_PCM_FMTBIT_U16_LE |
41                                     SNDRV_PCM_FMTBIT_U8 |
42                                     SNDRV_PCM_FMTBIT_S8,
43         .channels_min           = 2,
44         .channels_max           = 2,
45         .buffer_bytes_max       = 128*1024,
46         .period_bytes_min       = PAGE_SIZE,
47         .period_bytes_max       = PAGE_SIZE*2,
48         .periods_min            = 2,
49         .periods_max            = 128,
50         .fifo_size              = 32,
51 };
52
53 struct runtime_data {
54         spinlock_t lock;
55         int state;
56         unsigned int dma_loaded;
57         unsigned int dma_limit;
58         unsigned int dma_period;
59         dma_addr_t dma_start;
60         dma_addr_t dma_pos;
61         dma_addr_t dma_end;
62         struct s3c_dma_params *params;
63 };
64
65 /* dma_enqueue
66  *
67  * place a dma buffer onto the queue for the dma system
68  * to handle.
69 */
70 static void dma_enqueue(struct snd_pcm_substream *substream)
71 {
72         struct runtime_data *prtd = substream->runtime->private_data;
73         dma_addr_t pos = prtd->dma_pos;
74         unsigned int limit;
75         int ret;
76
77         pr_debug("Entered %s\n", __func__);
78
79         if (s3c_dma_has_circular())
80                 limit = (prtd->dma_end - prtd->dma_start) / prtd->dma_period;
81         else
82                 limit = prtd->dma_limit;
83
84         pr_debug("%s: loaded %d, limit %d\n",
85                                 __func__, prtd->dma_loaded, limit);
86
87         while (prtd->dma_loaded < limit) {
88                 unsigned long len = prtd->dma_period;
89
90                 pr_debug("dma_loaded: %d\n", prtd->dma_loaded);
91
92                 if ((pos + len) > prtd->dma_end) {
93                         len  = prtd->dma_end - pos;
94                         pr_debug("%s: corrected dma len %ld\n", __func__, len);
95                 }
96
97                 ret = s3c2410_dma_enqueue(prtd->params->channel,
98                         substream, pos, len);
99
100                 if (ret == 0) {
101                         prtd->dma_loaded++;
102                         pos += prtd->dma_period;
103                         if (pos >= prtd->dma_end)
104                                 pos = prtd->dma_start;
105                 } else
106                         break;
107         }
108
109         prtd->dma_pos = pos;
110 }
111
112 static void audio_buffdone(struct s3c2410_dma_chan *channel,
113                                 void *dev_id, int size,
114                                 enum s3c2410_dma_buffresult result)
115 {
116         struct snd_pcm_substream *substream = dev_id;
117         struct runtime_data *prtd;
118
119         pr_debug("Entered %s\n", __func__);
120
121         if (result == S3C2410_RES_ABORT || result == S3C2410_RES_ERR)
122                 return;
123
124         prtd = substream->runtime->private_data;
125
126         if (substream)
127                 snd_pcm_period_elapsed(substream);
128
129         spin_lock(&prtd->lock);
130         if (prtd->state & ST_RUNNING && !s3c_dma_has_circular()) {
131                 prtd->dma_loaded--;
132                 dma_enqueue(substream);
133         }
134
135         spin_unlock(&prtd->lock);
136 }
137
138 static int dma_hw_params(struct snd_pcm_substream *substream,
139         struct snd_pcm_hw_params *params)
140 {
141         struct snd_pcm_runtime *runtime = substream->runtime;
142         struct runtime_data *prtd = runtime->private_data;
143         struct snd_soc_pcm_runtime *rtd = substream->private_data;
144         unsigned long totbytes = params_buffer_bytes(params);
145         struct s3c_dma_params *dma =
146                 snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
147         int ret = 0;
148
149
150         pr_debug("Entered %s\n", __func__);
151
152         /* return if this is a bufferless transfer e.g.
153          * codec <--> BT codec or GSM modem -- lg FIXME */
154         if (!dma)
155                 return 0;
156
157         /* this may get called several times by oss emulation
158          * with different params -HW */
159         if (prtd->params == NULL) {
160                 /* prepare DMA */
161                 prtd->params = dma;
162
163                 pr_debug("params %p, client %p, channel %d\n", prtd->params,
164                         prtd->params->client, prtd->params->channel);
165
166                 ret = s3c2410_dma_request(prtd->params->channel,
167                                           prtd->params->client, NULL);
168
169                 if (ret < 0) {
170                         printk(KERN_ERR "failed to get dma channel\n");
171                         return ret;
172                 }
173
174                 /* use the circular buffering if we have it available. */
175                 if (s3c_dma_has_circular())
176                         s3c2410_dma_setflags(prtd->params->channel,
177                                              S3C2410_DMAF_CIRCULAR);
178         }
179
180         s3c2410_dma_set_buffdone_fn(prtd->params->channel,
181                                     audio_buffdone);
182
183         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
184
185         runtime->dma_bytes = totbytes;
186
187         spin_lock_irq(&prtd->lock);
188         prtd->dma_loaded = 0;
189         prtd->dma_limit = runtime->hw.periods_min;
190         prtd->dma_period = params_period_bytes(params);
191         prtd->dma_start = runtime->dma_addr;
192         prtd->dma_pos = prtd->dma_start;
193         prtd->dma_end = prtd->dma_start + totbytes;
194         spin_unlock_irq(&prtd->lock);
195
196         return 0;
197 }
198
199 static int dma_hw_free(struct snd_pcm_substream *substream)
200 {
201         struct runtime_data *prtd = substream->runtime->private_data;
202
203         pr_debug("Entered %s\n", __func__);
204
205         /* TODO - do we need to ensure DMA flushed */
206         snd_pcm_set_runtime_buffer(substream, NULL);
207
208         if (prtd->params) {
209                 s3c2410_dma_free(prtd->params->channel, prtd->params->client);
210                 prtd->params = NULL;
211         }
212
213         return 0;
214 }
215
216 static int dma_prepare(struct snd_pcm_substream *substream)
217 {
218         struct runtime_data *prtd = substream->runtime->private_data;
219         int ret = 0;
220
221         pr_debug("Entered %s\n", __func__);
222
223         /* return if this is a bufferless transfer e.g.
224          * codec <--> BT codec or GSM modem -- lg FIXME */
225         if (!prtd->params)
226                 return 0;
227
228         /* channel needs configuring for mem=>device, increment memory addr,
229          * sync to pclk, half-word transfers to the IIS-FIFO. */
230         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
231                 s3c2410_dma_devconfig(prtd->params->channel,
232                                       S3C2410_DMASRC_MEM,
233                                       prtd->params->dma_addr);
234         } else {
235                 s3c2410_dma_devconfig(prtd->params->channel,
236                                       S3C2410_DMASRC_HW,
237                                       prtd->params->dma_addr);
238         }
239
240         s3c2410_dma_config(prtd->params->channel,
241                            prtd->params->dma_size);
242
243         /* flush the DMA channel */
244         s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_FLUSH);
245         prtd->dma_loaded = 0;
246         prtd->dma_pos = prtd->dma_start;
247
248         /* enqueue dma buffers */
249         dma_enqueue(substream);
250
251         return ret;
252 }
253
254 static int dma_trigger(struct snd_pcm_substream *substream, int cmd)
255 {
256         struct runtime_data *prtd = substream->runtime->private_data;
257         int ret = 0;
258
259         pr_debug("Entered %s\n", __func__);
260
261         spin_lock(&prtd->lock);
262
263         switch (cmd) {
264         case SNDRV_PCM_TRIGGER_START:
265         case SNDRV_PCM_TRIGGER_RESUME:
266         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
267                 prtd->state |= ST_RUNNING;
268                 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_START);
269                 break;
270
271         case SNDRV_PCM_TRIGGER_STOP:
272         case SNDRV_PCM_TRIGGER_SUSPEND:
273         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
274                 prtd->state &= ~ST_RUNNING;
275                 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STOP);
276                 break;
277
278         default:
279                 ret = -EINVAL;
280                 break;
281         }
282
283         spin_unlock(&prtd->lock);
284
285         return ret;
286 }
287
288 static snd_pcm_uframes_t
289 dma_pointer(struct snd_pcm_substream *substream)
290 {
291         struct snd_pcm_runtime *runtime = substream->runtime;
292         struct runtime_data *prtd = runtime->private_data;
293         unsigned long res;
294         dma_addr_t src, dst;
295
296         pr_debug("Entered %s\n", __func__);
297
298         spin_lock(&prtd->lock);
299         s3c2410_dma_getposition(prtd->params->channel, &src, &dst);
300
301         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
302                 res = dst - prtd->dma_start;
303         else
304                 res = src - prtd->dma_start;
305
306         spin_unlock(&prtd->lock);
307
308         pr_debug("Pointer %x %x\n", src, dst);
309
310         /* we seem to be getting the odd error from the pcm library due
311          * to out-of-bounds pointers. this is maybe due to the dma engine
312          * not having loaded the new values for the channel before being
313          * called... (todo - fix )
314          */
315
316         if (res >= snd_pcm_lib_buffer_bytes(substream)) {
317                 if (res == snd_pcm_lib_buffer_bytes(substream))
318                         res = 0;
319         }
320
321         return bytes_to_frames(substream->runtime, res);
322 }
323
324 static int dma_open(struct snd_pcm_substream *substream)
325 {
326         struct snd_pcm_runtime *runtime = substream->runtime;
327         struct runtime_data *prtd;
328
329         pr_debug("Entered %s\n", __func__);
330
331         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
332         snd_soc_set_runtime_hwparams(substream, &dma_hardware);
333
334         prtd = kzalloc(sizeof(struct runtime_data), GFP_KERNEL);
335         if (prtd == NULL)
336                 return -ENOMEM;
337
338         spin_lock_init(&prtd->lock);
339
340         runtime->private_data = prtd;
341         return 0;
342 }
343
344 static int dma_close(struct snd_pcm_substream *substream)
345 {
346         struct snd_pcm_runtime *runtime = substream->runtime;
347         struct runtime_data *prtd = runtime->private_data;
348
349         pr_debug("Entered %s\n", __func__);
350
351         if (!prtd)
352                 pr_debug("dma_close called with prtd == NULL\n");
353
354         kfree(prtd);
355
356         return 0;
357 }
358
359 static int dma_mmap(struct snd_pcm_substream *substream,
360         struct vm_area_struct *vma)
361 {
362         struct snd_pcm_runtime *runtime = substream->runtime;
363
364         pr_debug("Entered %s\n", __func__);
365
366         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
367                                      runtime->dma_area,
368                                      runtime->dma_addr,
369                                      runtime->dma_bytes);
370 }
371
372 static struct snd_pcm_ops dma_ops = {
373         .open           = dma_open,
374         .close          = dma_close,
375         .ioctl          = snd_pcm_lib_ioctl,
376         .hw_params      = dma_hw_params,
377         .hw_free        = dma_hw_free,
378         .prepare        = dma_prepare,
379         .trigger        = dma_trigger,
380         .pointer        = dma_pointer,
381         .mmap           = dma_mmap,
382 };
383
384 static int preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
385 {
386         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
387         struct snd_dma_buffer *buf = &substream->dma_buffer;
388         size_t size = dma_hardware.buffer_bytes_max;
389
390         pr_debug("Entered %s\n", __func__);
391
392         buf->dev.type = SNDRV_DMA_TYPE_DEV;
393         buf->dev.dev = pcm->card->dev;
394         buf->private_data = NULL;
395         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
396                                            &buf->addr, GFP_KERNEL);
397         if (!buf->area)
398                 return -ENOMEM;
399         buf->bytes = size;
400         return 0;
401 }
402
403 static void dma_free_dma_buffers(struct snd_pcm *pcm)
404 {
405         struct snd_pcm_substream *substream;
406         struct snd_dma_buffer *buf;
407         int stream;
408
409         pr_debug("Entered %s\n", __func__);
410
411         for (stream = 0; stream < 2; stream++) {
412                 substream = pcm->streams[stream].substream;
413                 if (!substream)
414                         continue;
415
416                 buf = &substream->dma_buffer;
417                 if (!buf->area)
418                         continue;
419
420                 dma_free_writecombine(pcm->card->dev, buf->bytes,
421                                       buf->area, buf->addr);
422                 buf->area = NULL;
423         }
424 }
425
426 static u64 dma_mask = DMA_BIT_MASK(32);
427
428 static int dma_new(struct snd_soc_pcm_runtime *rtd)
429 {
430         struct snd_card *card = rtd->card->snd_card;
431         struct snd_soc_dai *dai = rtd->cpu_dai;
432         struct snd_pcm *pcm = rtd->pcm;
433         int ret = 0;
434
435         pr_debug("Entered %s\n", __func__);
436
437         if (!card->dev->dma_mask)
438                 card->dev->dma_mask = &dma_mask;
439         if (!card->dev->coherent_dma_mask)
440                 card->dev->coherent_dma_mask = 0xffffffff;
441
442         if (dai->driver->playback.channels_min) {
443                 ret = preallocate_dma_buffer(pcm,
444                         SNDRV_PCM_STREAM_PLAYBACK);
445                 if (ret)
446                         goto out;
447         }
448
449         if (dai->driver->capture.channels_min) {
450                 ret = preallocate_dma_buffer(pcm,
451                         SNDRV_PCM_STREAM_CAPTURE);
452                 if (ret)
453                         goto out;
454         }
455 out:
456         return ret;
457 }
458
459 static struct snd_soc_platform_driver samsung_asoc_platform = {
460         .ops            = &dma_ops,
461         .pcm_new        = dma_new,
462         .pcm_free       = dma_free_dma_buffers,
463 };
464
465 static int __devinit samsung_asoc_platform_probe(struct platform_device *pdev)
466 {
467         return snd_soc_register_platform(&pdev->dev, &samsung_asoc_platform);
468 }
469
470 static int __devexit samsung_asoc_platform_remove(struct platform_device *pdev)
471 {
472         snd_soc_unregister_platform(&pdev->dev);
473         return 0;
474 }
475
476 static struct platform_driver asoc_dma_driver = {
477         .driver = {
478                 .name = "samsung-audio",
479                 .owner = THIS_MODULE,
480         },
481
482         .probe = samsung_asoc_platform_probe,
483         .remove = __devexit_p(samsung_asoc_platform_remove),
484 };
485
486 static int __init samsung_asoc_init(void)
487 {
488         return platform_driver_register(&asoc_dma_driver);
489 }
490 module_init(samsung_asoc_init);
491
492 static void __exit samsung_asoc_exit(void)
493 {
494         platform_driver_unregister(&asoc_dma_driver);
495 }
496 module_exit(samsung_asoc_exit);
497
498 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
499 MODULE_DESCRIPTION("Samsung ASoC DMA Driver");
500 MODULE_LICENSE("GPL");
501 MODULE_ALIAS("platform:samsung-audio");