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I2C: Add helper macro for i2c_driver boilerplate
[zen-stable.git] / sound / soc / samsung / dma.c
bloba68b2644178477dd7fd6a5c0518498e4ff5da860
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 #include <linux/module.h>
20
21 #include <sound/soc.h>
22 #include <sound/pcm_params.h>
23
24 #include <asm/dma.h>
25 #include <mach/hardware.h>
26 #include <mach/dma.h>
27
28 #include "dma.h"
29
30 #define ST_RUNNING (1<<0)
31 #define ST_OPENED (1<<1)
32
33 static const struct snd_pcm_hardware dma_hardware = {
34 .info = SNDRV_PCM_INFO_INTERLEAVED |
35 SNDRV_PCM_INFO_BLOCK_TRANSFER |
36 SNDRV_PCM_INFO_MMAP |
37 SNDRV_PCM_INFO_MMAP_VALID |
38 SNDRV_PCM_INFO_PAUSE |
39 SNDRV_PCM_INFO_RESUME,
40 .formats = SNDRV_PCM_FMTBIT_S16_LE |
41 SNDRV_PCM_FMTBIT_U16_LE |
42 SNDRV_PCM_FMTBIT_U8 |
43 SNDRV_PCM_FMTBIT_S8,
44 .channels_min = 2,
45 .channels_max = 2,
46 .buffer_bytes_max = 128*1024,
47 .period_bytes_min = PAGE_SIZE,
48 .period_bytes_max = PAGE_SIZE*2,
49 .periods_min = 2,
50 .periods_max = 128,
51 .fifo_size = 32,
52 };
53
54 struct runtime_data {
55 spinlock_t lock;
56 int state;
57 unsigned int dma_loaded;
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 static void audio_buffdone(void *data);
66
67 /* dma_enqueue
68 *
69 * place a dma buffer onto the queue for the dma system
70 * to handle.
71 */
72 static void dma_enqueue(struct snd_pcm_substream *substream)
73 {
74 struct runtime_data *prtd = substream->runtime->private_data;
75 dma_addr_t pos = prtd->dma_pos;
76 unsigned int limit;
77 struct samsung_dma_prep_info dma_info;
78
79 pr_debug("Entered %s\n", __func__);
80
81 limit = (prtd->dma_end - prtd->dma_start) / prtd->dma_period;
82
83 pr_debug("%s: loaded %d, limit %d\n",
84 __func__, prtd->dma_loaded, limit);
85
86 dma_info.cap = (samsung_dma_has_circular() ? DMA_CYCLIC : DMA_SLAVE);
87 dma_info.direction =
88 (substream->stream == SNDRV_PCM_STREAM_PLAYBACK
89 ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
90 dma_info.fp = audio_buffdone;
91 dma_info.fp_param = substream;
92 dma_info.period = prtd->dma_period;
93 dma_info.len = prtd->dma_period*limit;
94
95 while (prtd->dma_loaded < limit) {
96 pr_debug("dma_loaded: %d\n", prtd->dma_loaded);
97
98 if ((pos + dma_info.period) > prtd->dma_end) {
99 dma_info.period = prtd->dma_end - pos;
100 pr_debug("%s: corrected dma len %ld\n",
101 __func__, dma_info.period);
102 }
103
104 dma_info.buf = pos;
105 prtd->params->ops->prepare(prtd->params->ch, &dma_info);
106
107 prtd->dma_loaded++;
108 pos += prtd->dma_period;
109 if (pos >= prtd->dma_end)
110 pos = prtd->dma_start;
111 }
112
113 prtd->dma_pos = pos;
114 }
115
116 static void audio_buffdone(void *data)
117 {
118 struct snd_pcm_substream *substream = data;
119 struct runtime_data *prtd = substream->runtime->private_data;
120
121 pr_debug("Entered %s\n", __func__);
122
123 if (prtd->state & ST_RUNNING) {
124 prtd->dma_pos += prtd->dma_period;
125 if (prtd->dma_pos >= prtd->dma_end)
126 prtd->dma_pos = prtd->dma_start;
127
128 if (substream)
129 snd_pcm_period_elapsed(substream);
130
131 spin_lock(&prtd->lock);
132 if (!samsung_dma_has_circular()) {
133 prtd->dma_loaded--;
134 dma_enqueue(substream);
135 }
136 spin_unlock(&prtd->lock);
137 }
138 }
139
140 static int dma_hw_params(struct snd_pcm_substream *substream,
141 struct snd_pcm_hw_params *params)
142 {
143 struct snd_pcm_runtime *runtime = substream->runtime;
144 struct runtime_data *prtd = runtime->private_data;
145 struct snd_soc_pcm_runtime *rtd = substream->private_data;
146 unsigned long totbytes = params_buffer_bytes(params);
147 struct s3c_dma_params *dma =
148 snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
149 struct samsung_dma_info dma_info;
150
151 pr_debug("Entered %s\n", __func__);
152
153 /* return if this is a bufferless transfer e.g.
154 * codec <--> BT codec or GSM modem -- lg FIXME */
155 if (!dma)
156 return 0;
157
158 /* this may get called several times by oss emulation
159 * with different params -HW */
160 if (prtd->params == NULL) {
161 /* prepare DMA */
162 prtd->params = dma;
163
164 pr_debug("params %p, client %p, channel %d\n", prtd->params,
165 prtd->params->client, prtd->params->channel);
166
167 prtd->params->ops = samsung_dma_get_ops();
168
169 dma_info.cap = (samsung_dma_has_circular() ?
170 DMA_CYCLIC : DMA_SLAVE);
171 dma_info.client = prtd->params->client;
172 dma_info.direction =
173 (substream->stream == SNDRV_PCM_STREAM_PLAYBACK
174 ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
175 dma_info.width = prtd->params->dma_size;
176 dma_info.fifo = prtd->params->dma_addr;
177 prtd->params->ch = prtd->params->ops->request(
178 prtd->params->channel, &dma_info);
179 }
180
181 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
182
183 runtime->dma_bytes = totbytes;
184
185 spin_lock_irq(&prtd->lock);
186 prtd->dma_loaded = 0;
187 prtd->dma_period = params_period_bytes(params);
188 prtd->dma_start = runtime->dma_addr;
189 prtd->dma_pos = prtd->dma_start;
190 prtd->dma_end = prtd->dma_start + totbytes;
191 spin_unlock_irq(&prtd->lock);
192
193 return 0;
194 }
195
196 static int dma_hw_free(struct snd_pcm_substream *substream)
197 {
198 struct runtime_data *prtd = substream->runtime->private_data;
199
200 pr_debug("Entered %s\n", __func__);
201
202 snd_pcm_set_runtime_buffer(substream, NULL);
203
204 if (prtd->params) {
205 prtd->params->ops->flush(prtd->params->ch);
206 prtd->params->ops->release(prtd->params->ch,
207 prtd->params->client);
208 prtd->params = NULL;
209 }
210
211 return 0;
212 }
213
214 static int dma_prepare(struct snd_pcm_substream *substream)
215 {
216 struct runtime_data *prtd = substream->runtime->private_data;
217 int ret = 0;
218
219 pr_debug("Entered %s\n", __func__);
220
221 /* return if this is a bufferless transfer e.g.
222 * codec <--> BT codec or GSM modem -- lg FIXME */
223 if (!prtd->params)
224 return 0;
225
226 /* flush the DMA channel */
227 prtd->params->ops->flush(prtd->params->ch);
228
229 prtd->dma_loaded = 0;
230 prtd->dma_pos = prtd->dma_start;
231
232 /* enqueue dma buffers */
233 dma_enqueue(substream);
234
235 return ret;
236 }
237
238 static int dma_trigger(struct snd_pcm_substream *substream, int cmd)
239 {
240 struct runtime_data *prtd = substream->runtime->private_data;
241 int ret = 0;
242
243 pr_debug("Entered %s\n", __func__);
244
245 spin_lock(&prtd->lock);
246
247 switch (cmd) {
248 case SNDRV_PCM_TRIGGER_START:
249 case SNDRV_PCM_TRIGGER_RESUME:
250 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
251 prtd->state |= ST_RUNNING;
252 prtd->params->ops->trigger(prtd->params->ch);
253 break;
254
255 case SNDRV_PCM_TRIGGER_STOP:
256 case SNDRV_PCM_TRIGGER_SUSPEND:
257 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
258 prtd->state &= ~ST_RUNNING;
259 prtd->params->ops->stop(prtd->params->ch);
260 break;
261
262 default:
263 ret = -EINVAL;
264 break;
265 }
266
267 spin_unlock(&prtd->lock);
268
269 return ret;
270 }
271
272 static snd_pcm_uframes_t
273 dma_pointer(struct snd_pcm_substream *substream)
274 {
275 struct snd_pcm_runtime *runtime = substream->runtime;
276 struct runtime_data *prtd = runtime->private_data;
277 unsigned long res;
278
279 pr_debug("Entered %s\n", __func__);
280
281 res = prtd->dma_pos - prtd->dma_start;
282
283 pr_debug("Pointer offset: %lu\n", res);
284
285 /* we seem to be getting the odd error from the pcm library due
286 * to out-of-bounds pointers. this is maybe due to the dma engine
287 * not having loaded the new values for the channel before being
288 * called... (todo - fix )
289 */
290
291 if (res >= snd_pcm_lib_buffer_bytes(substream)) {
292 if (res == snd_pcm_lib_buffer_bytes(substream))
293 res = 0;
294 }
295
296 return bytes_to_frames(substream->runtime, res);
297 }
298
299 static int dma_open(struct snd_pcm_substream *substream)
300 {
301 struct snd_pcm_runtime *runtime = substream->runtime;
302 struct runtime_data *prtd;
303
304 pr_debug("Entered %s\n", __func__);
305
306 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
307 snd_soc_set_runtime_hwparams(substream, &dma_hardware);
308
309 prtd = kzalloc(sizeof(struct runtime_data), GFP_KERNEL);
310 if (prtd == NULL)
311 return -ENOMEM;
312
313 spin_lock_init(&prtd->lock);
314
315 runtime->private_data = prtd;
316 return 0;
317 }
318
319 static int dma_close(struct snd_pcm_substream *substream)
320 {
321 struct snd_pcm_runtime *runtime = substream->runtime;
322 struct runtime_data *prtd = runtime->private_data;
323
324 pr_debug("Entered %s\n", __func__);
325
326 if (!prtd)
327 pr_debug("dma_close called with prtd == NULL\n");
328
329 kfree(prtd);
330
331 return 0;
332 }
333
334 static int dma_mmap(struct snd_pcm_substream *substream,
335 struct vm_area_struct *vma)
336 {
337 struct snd_pcm_runtime *runtime = substream->runtime;
338
339 pr_debug("Entered %s\n", __func__);
340
341 return dma_mmap_writecombine(substream->pcm->card->dev, vma,
342 runtime->dma_area,
343 runtime->dma_addr,
344 runtime->dma_bytes);
345 }
346
347 static struct snd_pcm_ops dma_ops = {
348 .open = dma_open,
349 .close = dma_close,
350 .ioctl = snd_pcm_lib_ioctl,
351 .hw_params = dma_hw_params,
352 .hw_free = dma_hw_free,
353 .prepare = dma_prepare,
354 .trigger = dma_trigger,
355 .pointer = dma_pointer,
356 .mmap = dma_mmap,
357 };
358
359 static int preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
360 {
361 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
362 struct snd_dma_buffer *buf = &substream->dma_buffer;
363 size_t size = dma_hardware.buffer_bytes_max;
364
365 pr_debug("Entered %s\n", __func__);
366
367 buf->dev.type = SNDRV_DMA_TYPE_DEV;
368 buf->dev.dev = pcm->card->dev;
369 buf->private_data = NULL;
370 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
371 &buf->addr, GFP_KERNEL);
372 if (!buf->area)
373 return -ENOMEM;
374 buf->bytes = size;
375 return 0;
376 }
377
378 static void dma_free_dma_buffers(struct snd_pcm *pcm)
379 {
380 struct snd_pcm_substream *substream;
381 struct snd_dma_buffer *buf;
382 int stream;
383
384 pr_debug("Entered %s\n", __func__);
385
386 for (stream = 0; stream < 2; stream++) {
387 substream = pcm->streams[stream].substream;
388 if (!substream)
389 continue;
390
391 buf = &substream->dma_buffer;
392 if (!buf->area)
393 continue;
394
395 dma_free_writecombine(pcm->card->dev, buf->bytes,
396 buf->area, buf->addr);
397 buf->area = NULL;
398 }
399 }
400
401 static u64 dma_mask = DMA_BIT_MASK(32);
402
403 static int dma_new(struct snd_soc_pcm_runtime *rtd)
404 {
405 struct snd_card *card = rtd->card->snd_card;
406 struct snd_soc_dai *dai = rtd->cpu_dai;
407 struct snd_pcm *pcm = rtd->pcm;
408 int ret = 0;
409
410 pr_debug("Entered %s\n", __func__);
411
412 if (!card->dev->dma_mask)
413 card->dev->dma_mask = &dma_mask;
414 if (!card->dev->coherent_dma_mask)
415 card->dev->coherent_dma_mask = 0xffffffff;
416
417 if (dai->driver->playback.channels_min) {
418 ret = preallocate_dma_buffer(pcm,
419 SNDRV_PCM_STREAM_PLAYBACK);
420 if (ret)
421 goto out;
422 }
423
424 if (dai->driver->capture.channels_min) {
425 ret = preallocate_dma_buffer(pcm,
426 SNDRV_PCM_STREAM_CAPTURE);
427 if (ret)
428 goto out;
429 }
430 out:
431 return ret;
432 }
433
434 static struct snd_soc_platform_driver samsung_asoc_platform = {
435 .ops = &dma_ops,
436 .pcm_new = dma_new,
437 .pcm_free = dma_free_dma_buffers,
438 };
439
440 static int __devinit samsung_asoc_platform_probe(struct platform_device *pdev)
441 {
442 return snd_soc_register_platform(&pdev->dev, &samsung_asoc_platform);
443 }
444
445 static int __devexit samsung_asoc_platform_remove(struct platform_device *pdev)
446 {
447 snd_soc_unregister_platform(&pdev->dev);
448 return 0;
449 }
450
451 static struct platform_driver asoc_dma_driver = {
452 .driver = {
453 .name = "samsung-audio",
454 .owner = THIS_MODULE,
455 },
456
457 .probe = samsung_asoc_platform_probe,
458 .remove = __devexit_p(samsung_asoc_platform_remove),
459 };
460
461 static int __init samsung_asoc_init(void)
462 {
463 return platform_driver_register(&asoc_dma_driver);
464 }
465 module_init(samsung_asoc_init);
466
467 static void __exit samsung_asoc_exit(void)
468 {
469 platform_driver_unregister(&asoc_dma_driver);
470 }
471 module_exit(samsung_asoc_exit);
472
473 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
474 MODULE_DESCRIPTION("Samsung ASoC DMA Driver");
475 MODULE_LICENSE("GPL");
476 MODULE_ALIAS("platform:samsung-audio");