]> git.karo-electronics.de Git - mv-sheeva.git/blob - sound/soc/s3c24xx/s3c-dma.c
Merge branch 'for-2.6.36' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie...
[mv-sheeva.git] / sound / soc / s3c24xx / s3c-dma.c
1 /*
2  * s3c-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/module.h>
18 #include <linux/init.h>
19 #include <linux/io.h>
20 #include <linux/platform_device.h>
21 #include <linux/slab.h>
22 #include <linux/dma-mapping.h>
23
24 #include <sound/core.h>
25 #include <sound/pcm.h>
26 #include <sound/pcm_params.h>
27 #include <sound/soc.h>
28
29 #include <asm/dma.h>
30 #include <mach/hardware.h>
31 #include <mach/dma.h>
32
33 #include "s3c-dma.h"
34
35 static const struct snd_pcm_hardware s3c_dma_hardware = {
36         .info                   = SNDRV_PCM_INFO_INTERLEAVED |
37                                     SNDRV_PCM_INFO_BLOCK_TRANSFER |
38                                     SNDRV_PCM_INFO_MMAP |
39                                     SNDRV_PCM_INFO_MMAP_VALID |
40                                     SNDRV_PCM_INFO_PAUSE |
41                                     SNDRV_PCM_INFO_RESUME,
42         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
43                                     SNDRV_PCM_FMTBIT_U16_LE |
44                                     SNDRV_PCM_FMTBIT_U8 |
45                                     SNDRV_PCM_FMTBIT_S8,
46         .channels_min           = 2,
47         .channels_max           = 2,
48         .buffer_bytes_max       = 128*1024,
49         .period_bytes_min       = PAGE_SIZE,
50         .period_bytes_max       = PAGE_SIZE*2,
51         .periods_min            = 2,
52         .periods_max            = 128,
53         .fifo_size              = 32,
54 };
55
56 struct s3c24xx_runtime_data {
57         spinlock_t lock;
58         int state;
59         unsigned int dma_loaded;
60         unsigned int dma_limit;
61         unsigned int dma_period;
62         dma_addr_t dma_start;
63         dma_addr_t dma_pos;
64         dma_addr_t dma_end;
65         struct s3c_dma_params *params;
66 };
67
68 /* s3c_dma_enqueue
69  *
70  * place a dma buffer onto the queue for the dma system
71  * to handle.
72 */
73 static void s3c_dma_enqueue(struct snd_pcm_substream *substream)
74 {
75         struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
76         dma_addr_t pos = prtd->dma_pos;
77         unsigned int limit;
78         int ret;
79
80         pr_debug("Entered %s\n", __func__);
81
82         if (s3c_dma_has_circular())
83                 limit = (prtd->dma_end - prtd->dma_start) / prtd->dma_period;
84         else
85                 limit = prtd->dma_limit;
86
87         pr_debug("%s: loaded %d, limit %d\n",
88                                 __func__, prtd->dma_loaded, limit);
89
90         while (prtd->dma_loaded < limit) {
91                 unsigned long len = prtd->dma_period;
92
93                 pr_debug("dma_loaded: %d\n", prtd->dma_loaded);
94
95                 if ((pos + len) > prtd->dma_end) {
96                         len  = prtd->dma_end - pos;
97                         pr_debug(KERN_DEBUG "%s: corrected dma len %ld\n",
98                                __func__, len);
99                 }
100
101                 ret = s3c2410_dma_enqueue(prtd->params->channel,
102                         substream, pos, len);
103
104                 if (ret == 0) {
105                         prtd->dma_loaded++;
106                         pos += prtd->dma_period;
107                         if (pos >= prtd->dma_end)
108                                 pos = prtd->dma_start;
109                 } else
110                         break;
111         }
112
113         prtd->dma_pos = pos;
114 }
115
116 static void s3c24xx_audio_buffdone(struct s3c2410_dma_chan *channel,
117                                 void *dev_id, int size,
118                                 enum s3c2410_dma_buffresult result)
119 {
120         struct snd_pcm_substream *substream = dev_id;
121         struct s3c24xx_runtime_data *prtd;
122
123         pr_debug("Entered %s\n", __func__);
124
125         if (result == S3C2410_RES_ABORT || result == S3C2410_RES_ERR)
126                 return;
127
128         prtd = substream->runtime->private_data;
129
130         if (substream)
131                 snd_pcm_period_elapsed(substream);
132
133         spin_lock(&prtd->lock);
134         if (prtd->state & ST_RUNNING && !s3c_dma_has_circular()) {
135                 prtd->dma_loaded--;
136                 s3c_dma_enqueue(substream);
137         }
138
139         spin_unlock(&prtd->lock);
140 }
141
142 static int s3c_dma_hw_params(struct snd_pcm_substream *substream,
143         struct snd_pcm_hw_params *params)
144 {
145         struct snd_pcm_runtime *runtime = substream->runtime;
146         struct s3c24xx_runtime_data *prtd = runtime->private_data;
147         struct snd_soc_pcm_runtime *rtd = substream->private_data;
148         unsigned long totbytes = params_buffer_bytes(params);
149         struct s3c_dma_params *dma =
150                 snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
151         int ret = 0;
152
153
154         pr_debug("Entered %s\n", __func__);
155
156         /* return if this is a bufferless transfer e.g.
157          * codec <--> BT codec or GSM modem -- lg FIXME */
158         if (!dma)
159                 return 0;
160
161         /* this may get called several times by oss emulation
162          * with different params -HW */
163         if (prtd->params == NULL) {
164                 /* prepare DMA */
165                 prtd->params = dma;
166
167                 pr_debug("params %p, client %p, channel %d\n", prtd->params,
168                         prtd->params->client, prtd->params->channel);
169
170                 ret = s3c2410_dma_request(prtd->params->channel,
171                                           prtd->params->client, NULL);
172
173                 if (ret < 0) {
174                         printk(KERN_ERR "failed to get dma channel\n");
175                         return ret;
176                 }
177
178                 /* use the circular buffering if we have it available. */
179                 if (s3c_dma_has_circular())
180                         s3c2410_dma_setflags(prtd->params->channel,
181                                              S3C2410_DMAF_CIRCULAR);
182         }
183
184         s3c2410_dma_set_buffdone_fn(prtd->params->channel,
185                                     s3c24xx_audio_buffdone);
186
187         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
188
189         runtime->dma_bytes = totbytes;
190
191         spin_lock_irq(&prtd->lock);
192         prtd->dma_loaded = 0;
193         prtd->dma_limit = runtime->hw.periods_min;
194         prtd->dma_period = params_period_bytes(params);
195         prtd->dma_start = runtime->dma_addr;
196         prtd->dma_pos = prtd->dma_start;
197         prtd->dma_end = prtd->dma_start + totbytes;
198         spin_unlock_irq(&prtd->lock);
199
200         return 0;
201 }
202
203 static int s3c_dma_hw_free(struct snd_pcm_substream *substream)
204 {
205         struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
206
207         pr_debug("Entered %s\n", __func__);
208
209         /* TODO - do we need to ensure DMA flushed */
210         snd_pcm_set_runtime_buffer(substream, NULL);
211
212         if (prtd->params) {
213                 s3c2410_dma_free(prtd->params->channel, prtd->params->client);
214                 prtd->params = NULL;
215         }
216
217         return 0;
218 }
219
220 static int s3c_dma_prepare(struct snd_pcm_substream *substream)
221 {
222         struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
223         int ret = 0;
224
225         pr_debug("Entered %s\n", __func__);
226
227         /* return if this is a bufferless transfer e.g.
228          * codec <--> BT codec or GSM modem -- lg FIXME */
229         if (!prtd->params)
230                 return 0;
231
232         /* channel needs configuring for mem=>device, increment memory addr,
233          * sync to pclk, half-word transfers to the IIS-FIFO. */
234         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
235                 s3c2410_dma_devconfig(prtd->params->channel,
236                                       S3C2410_DMASRC_MEM,
237                                       prtd->params->dma_addr);
238         } else {
239                 s3c2410_dma_devconfig(prtd->params->channel,
240                                       S3C2410_DMASRC_HW,
241                                       prtd->params->dma_addr);
242         }
243
244         s3c2410_dma_config(prtd->params->channel,
245                            prtd->params->dma_size);
246
247         /* flush the DMA channel */
248         s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_FLUSH);
249         prtd->dma_loaded = 0;
250         prtd->dma_pos = prtd->dma_start;
251
252         /* enqueue dma buffers */
253         s3c_dma_enqueue(substream);
254
255         return ret;
256 }
257
258 static int s3c_dma_trigger(struct snd_pcm_substream *substream, int cmd)
259 {
260         struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
261         int ret = 0;
262
263         pr_debug("Entered %s\n", __func__);
264
265         spin_lock(&prtd->lock);
266
267         switch (cmd) {
268         case SNDRV_PCM_TRIGGER_START:
269         case SNDRV_PCM_TRIGGER_RESUME:
270         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
271                 prtd->state |= ST_RUNNING;
272                 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_START);
273                 break;
274
275         case SNDRV_PCM_TRIGGER_STOP:
276         case SNDRV_PCM_TRIGGER_SUSPEND:
277         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
278                 prtd->state &= ~ST_RUNNING;
279                 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STOP);
280                 break;
281
282         default:
283                 ret = -EINVAL;
284                 break;
285         }
286
287         spin_unlock(&prtd->lock);
288
289         return ret;
290 }
291
292 static snd_pcm_uframes_t
293 s3c_dma_pointer(struct snd_pcm_substream *substream)
294 {
295         struct snd_pcm_runtime *runtime = substream->runtime;
296         struct s3c24xx_runtime_data *prtd = runtime->private_data;
297         unsigned long res;
298         dma_addr_t src, dst;
299
300         pr_debug("Entered %s\n", __func__);
301
302         spin_lock(&prtd->lock);
303         s3c2410_dma_getposition(prtd->params->channel, &src, &dst);
304
305         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
306                 res = dst - prtd->dma_start;
307         else
308                 res = src - prtd->dma_start;
309
310         spin_unlock(&prtd->lock);
311
312         pr_debug("Pointer %x %x\n", src, dst);
313
314         /* we seem to be getting the odd error from the pcm library due
315          * to out-of-bounds pointers. this is maybe due to the dma engine
316          * not having loaded the new values for the channel before being
317          * callled... (todo - fix )
318          */
319
320         if (res >= snd_pcm_lib_buffer_bytes(substream)) {
321                 if (res == snd_pcm_lib_buffer_bytes(substream))
322                         res = 0;
323         }
324
325         return bytes_to_frames(substream->runtime, res);
326 }
327
328 static int s3c_dma_open(struct snd_pcm_substream *substream)
329 {
330         struct snd_pcm_runtime *runtime = substream->runtime;
331         struct s3c24xx_runtime_data *prtd;
332
333         pr_debug("Entered %s\n", __func__);
334
335         snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
336         snd_soc_set_runtime_hwparams(substream, &s3c_dma_hardware);
337
338         prtd = kzalloc(sizeof(struct s3c24xx_runtime_data), GFP_KERNEL);
339         if (prtd == NULL)
340                 return -ENOMEM;
341
342         spin_lock_init(&prtd->lock);
343
344         runtime->private_data = prtd;
345         return 0;
346 }
347
348 static int s3c_dma_close(struct snd_pcm_substream *substream)
349 {
350         struct snd_pcm_runtime *runtime = substream->runtime;
351         struct s3c24xx_runtime_data *prtd = runtime->private_data;
352
353         pr_debug("Entered %s\n", __func__);
354
355         if (!prtd)
356                 pr_debug("s3c_dma_close called with prtd == NULL\n");
357
358         kfree(prtd);
359
360         return 0;
361 }
362
363 static int s3c_dma_mmap(struct snd_pcm_substream *substream,
364         struct vm_area_struct *vma)
365 {
366         struct snd_pcm_runtime *runtime = substream->runtime;
367
368         pr_debug("Entered %s\n", __func__);
369
370         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
371                                      runtime->dma_area,
372                                      runtime->dma_addr,
373                                      runtime->dma_bytes);
374 }
375
376 static struct snd_pcm_ops s3c_dma_ops = {
377         .open           = s3c_dma_open,
378         .close          = s3c_dma_close,
379         .ioctl          = snd_pcm_lib_ioctl,
380         .hw_params      = s3c_dma_hw_params,
381         .hw_free        = s3c_dma_hw_free,
382         .prepare        = s3c_dma_prepare,
383         .trigger        = s3c_dma_trigger,
384         .pointer        = s3c_dma_pointer,
385         .mmap           = s3c_dma_mmap,
386 };
387
388 static int s3c_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
389 {
390         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
391         struct snd_dma_buffer *buf = &substream->dma_buffer;
392         size_t size = s3c_dma_hardware.buffer_bytes_max;
393
394         pr_debug("Entered %s\n", __func__);
395
396         buf->dev.type = SNDRV_DMA_TYPE_DEV;
397         buf->dev.dev = pcm->card->dev;
398         buf->private_data = NULL;
399         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
400                                            &buf->addr, GFP_KERNEL);
401         if (!buf->area)
402                 return -ENOMEM;
403         buf->bytes = size;
404         return 0;
405 }
406
407 static void s3c_dma_free_dma_buffers(struct snd_pcm *pcm)
408 {
409         struct snd_pcm_substream *substream;
410         struct snd_dma_buffer *buf;
411         int stream;
412
413         pr_debug("Entered %s\n", __func__);
414
415         for (stream = 0; stream < 2; stream++) {
416                 substream = pcm->streams[stream].substream;
417                 if (!substream)
418                         continue;
419
420                 buf = &substream->dma_buffer;
421                 if (!buf->area)
422                         continue;
423
424                 dma_free_writecombine(pcm->card->dev, buf->bytes,
425                                       buf->area, buf->addr);
426                 buf->area = NULL;
427         }
428 }
429
430 static u64 s3c_dma_mask = DMA_BIT_MASK(32);
431
432 static int s3c_dma_new(struct snd_card *card,
433         struct snd_soc_dai *dai, struct snd_pcm *pcm)
434 {
435         int ret = 0;
436
437         pr_debug("Entered %s\n", __func__);
438
439         if (!card->dev->dma_mask)
440                 card->dev->dma_mask = &s3c_dma_mask;
441         if (!card->dev->coherent_dma_mask)
442                 card->dev->coherent_dma_mask = 0xffffffff;
443
444         if (dai->driver->playback.channels_min) {
445                 ret = s3c_preallocate_dma_buffer(pcm,
446                         SNDRV_PCM_STREAM_PLAYBACK);
447                 if (ret)
448                         goto out;
449         }
450
451         if (dai->driver->capture.channels_min) {
452                 ret = s3c_preallocate_dma_buffer(pcm,
453                         SNDRV_PCM_STREAM_CAPTURE);
454                 if (ret)
455                         goto out;
456         }
457  out:
458         return ret;
459 }
460
461 static struct snd_soc_platform_driver s3c24xx_soc_platform = {
462         .ops            = &s3c_dma_ops,
463         .pcm_new        = s3c_dma_new,
464         .pcm_free       = s3c_dma_free_dma_buffers,
465 };
466
467 static int __devinit s3c24xx_soc_platform_probe(struct platform_device *pdev)
468 {
469         return snd_soc_register_platform(&pdev->dev, &s3c24xx_soc_platform);
470 }
471
472 static int __devexit s3c24xx_soc_platform_remove(struct platform_device *pdev)
473 {
474         snd_soc_unregister_platform(&pdev->dev);
475         return 0;
476 }
477
478 static struct platform_driver s3c24xx_pcm_driver = {
479         .driver = {
480                 .name = "s3c24xx-pcm-audio",
481                 .owner = THIS_MODULE,
482         },
483
484         .probe = s3c24xx_soc_platform_probe,
485         .remove = __devexit_p(s3c24xx_soc_platform_remove),
486 };
487
488 static int __init snd_s3c24xx_pcm_init(void)
489 {
490         return platform_driver_register(&s3c24xx_pcm_driver);
491 }
492 module_init(snd_s3c24xx_pcm_init);
493
494 static void __exit snd_s3c24xx_pcm_exit(void)
495 {
496         platform_driver_unregister(&s3c24xx_pcm_driver);
497 }
498 module_exit(snd_s3c24xx_pcm_exit);
499
500 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
501 MODULE_DESCRIPTION("Samsung S3C Audio DMA module");
502 MODULE_LICENSE("GPL");
503 MODULE_ALIAS("platform:s3c24xx-pcm-audio");