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Merge remote-tracking branch 'net/master'
[linux-2.6/next.git] / sound / soc / samsung / dma.c
blob9465588b02f2c99e478e4297da001521d13f9b35
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");
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