1
2
3
4
5
6
7
8
9
10
11
12
13
14
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#include <plat/audio.h>
33
34#include "s3c24xx-pcm.h"
35
36static const struct snd_pcm_hardware s3c24xx_pcm_hardware = {
37 .info = SNDRV_PCM_INFO_INTERLEAVED |
38 SNDRV_PCM_INFO_BLOCK_TRANSFER |
39 SNDRV_PCM_INFO_MMAP |
40 SNDRV_PCM_INFO_MMAP_VALID |
41 SNDRV_PCM_INFO_PAUSE |
42 SNDRV_PCM_INFO_RESUME,
43 .formats = SNDRV_PCM_FMTBIT_S16_LE |
44 SNDRV_PCM_FMTBIT_U16_LE |
45 SNDRV_PCM_FMTBIT_U8 |
46 SNDRV_PCM_FMTBIT_S8,
47 .channels_min = 2,
48 .channels_max = 2,
49 .buffer_bytes_max = 128*1024,
50 .period_bytes_min = PAGE_SIZE,
51 .period_bytes_max = PAGE_SIZE*2,
52 .periods_min = 2,
53 .periods_max = 128,
54 .fifo_size = 32,
55};
56
57struct s3c24xx_runtime_data {
58 spinlock_t lock;
59 int state;
60 unsigned int dma_loaded;
61 unsigned int dma_limit;
62 unsigned int dma_period;
63 dma_addr_t dma_start;
64 dma_addr_t dma_pos;
65 dma_addr_t dma_end;
66 struct s3c24xx_pcm_dma_params *params;
67};
68
69
70
71
72
73
74static void s3c24xx_pcm_enqueue(struct snd_pcm_substream *substream)
75{
76 struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
77 dma_addr_t pos = prtd->dma_pos;
78 unsigned int limit;
79 int ret;
80
81 pr_debug("Entered %s\n", __func__);
82
83 if (s3c_dma_has_circular()) {
84 limit = (prtd->dma_end - prtd->dma_start) / prtd->dma_period;
85 } else
86 limit = prtd->dma_limit;
87
88 pr_debug("%s: loaded %d, limit %d\n", __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
116static 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 s3c24xx_pcm_enqueue(substream);
137 }
138
139 spin_unlock(&prtd->lock);
140}
141
142static int s3c24xx_pcm_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 struct s3c24xx_pcm_dma_params *dma = rtd->dai->cpu_dai->dma_data;
149 unsigned long totbytes = params_buffer_bytes(params);
150 int ret = 0;
151
152 pr_debug("Entered %s\n", __func__);
153
154
155
156 if (!dma)
157 return 0;
158
159
160
161 if (prtd->params == NULL) {
162
163 prtd->params = dma;
164
165 pr_debug("params %p, client %p, channel %d\n", prtd->params,
166 prtd->params->client, prtd->params->channel);
167
168 ret = s3c2410_dma_request(prtd->params->channel,
169 prtd->params->client, NULL);
170
171 if (ret < 0) {
172 printk(KERN_ERR "failed to get dma channel\n");
173 return ret;
174 }
175
176
177 if (s3c_dma_has_circular())
178 s3c2410_dma_setflags(prtd->params->channel,
179 S3C2410_DMAF_CIRCULAR);
180 }
181
182 s3c2410_dma_set_buffdone_fn(prtd->params->channel,
183 s3c24xx_audio_buffdone);
184
185 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
186
187 runtime->dma_bytes = totbytes;
188
189 spin_lock_irq(&prtd->lock);
190 prtd->dma_loaded = 0;
191 prtd->dma_limit = runtime->hw.periods_min;
192 prtd->dma_period = params_period_bytes(params);
193 prtd->dma_start = runtime->dma_addr;
194 prtd->dma_pos = prtd->dma_start;
195 prtd->dma_end = prtd->dma_start + totbytes;
196 spin_unlock_irq(&prtd->lock);
197
198 return 0;
199}
200
201static int s3c24xx_pcm_hw_free(struct snd_pcm_substream *substream)
202{
203 struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
204
205 pr_debug("Entered %s\n", __func__);
206
207
208 snd_pcm_set_runtime_buffer(substream, NULL);
209
210 if (prtd->params) {
211 s3c2410_dma_free(prtd->params->channel, prtd->params->client);
212 prtd->params = NULL;
213 }
214
215 return 0;
216}
217
218static int s3c24xx_pcm_prepare(struct snd_pcm_substream *substream)
219{
220 struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
221 int ret = 0;
222
223 pr_debug("Entered %s\n", __func__);
224
225
226
227 if (!prtd->params)
228 return 0;
229
230
231
232 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
233 s3c2410_dma_devconfig(prtd->params->channel,
234 S3C2410_DMASRC_MEM,
235 prtd->params->dma_addr);
236 } else {
237 s3c2410_dma_devconfig(prtd->params->channel,
238 S3C2410_DMASRC_HW,
239 prtd->params->dma_addr);
240 }
241
242 s3c2410_dma_config(prtd->params->channel,
243 prtd->params->dma_size);
244
245
246 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_FLUSH);
247 prtd->dma_loaded = 0;
248 prtd->dma_pos = prtd->dma_start;
249
250
251 s3c24xx_pcm_enqueue(substream);
252
253 return ret;
254}
255
256static int s3c24xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
257{
258 struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
259 int ret = 0;
260
261 pr_debug("Entered %s\n", __func__);
262
263 spin_lock(&prtd->lock);
264
265 switch (cmd) {
266 case SNDRV_PCM_TRIGGER_START:
267 case SNDRV_PCM_TRIGGER_RESUME:
268 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
269 prtd->state |= ST_RUNNING;
270 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_START);
271 break;
272
273 case SNDRV_PCM_TRIGGER_STOP:
274 case SNDRV_PCM_TRIGGER_SUSPEND:
275 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
276 prtd->state &= ~ST_RUNNING;
277 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STOP);
278 break;
279
280 default:
281 ret = -EINVAL;
282 break;
283 }
284
285 spin_unlock(&prtd->lock);
286
287 return ret;
288}
289
290static snd_pcm_uframes_t
291s3c24xx_pcm_pointer(struct snd_pcm_substream *substream)
292{
293 struct snd_pcm_runtime *runtime = substream->runtime;
294 struct s3c24xx_runtime_data *prtd = runtime->private_data;
295 unsigned long res;
296 dma_addr_t src, dst;
297
298 pr_debug("Entered %s\n", __func__);
299
300 spin_lock(&prtd->lock);
301 s3c2410_dma_getposition(prtd->params->channel, &src, &dst);
302
303 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
304 res = dst - prtd->dma_start;
305 else
306 res = src - prtd->dma_start;
307
308 spin_unlock(&prtd->lock);
309
310 pr_debug("Pointer %x %x\n", src, dst);
311
312
313
314
315
316
317
318 if (res >= snd_pcm_lib_buffer_bytes(substream)) {
319 if (res == snd_pcm_lib_buffer_bytes(substream))
320 res = 0;
321 }
322
323 return bytes_to_frames(substream->runtime, res);
324}
325
326static int s3c24xx_pcm_open(struct snd_pcm_substream *substream)
327{
328 struct snd_pcm_runtime *runtime = substream->runtime;
329 struct s3c24xx_runtime_data *prtd;
330
331 pr_debug("Entered %s\n", __func__);
332
333 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
334 snd_soc_set_runtime_hwparams(substream, &s3c24xx_pcm_hardware);
335
336 prtd = kzalloc(sizeof(struct s3c24xx_runtime_data), GFP_KERNEL);
337 if (prtd == NULL)
338 return -ENOMEM;
339
340 spin_lock_init(&prtd->lock);
341
342 runtime->private_data = prtd;
343 return 0;
344}
345
346static int s3c24xx_pcm_close(struct snd_pcm_substream *substream)
347{
348 struct snd_pcm_runtime *runtime = substream->runtime;
349 struct s3c24xx_runtime_data *prtd = runtime->private_data;
350
351 pr_debug("Entered %s\n", __func__);
352
353 if (!prtd)
354 pr_debug("s3c24xx_pcm_close called with prtd == NULL\n");
355
356 kfree(prtd);
357
358 return 0;
359}
360
361static int s3c24xx_pcm_mmap(struct snd_pcm_substream *substream,
362 struct vm_area_struct *vma)
363{
364 struct snd_pcm_runtime *runtime = substream->runtime;
365
366 pr_debug("Entered %s\n", __func__);
367
368 return dma_mmap_writecombine(substream->pcm->card->dev, vma,
369 runtime->dma_area,
370 runtime->dma_addr,
371 runtime->dma_bytes);
372}
373
374static struct snd_pcm_ops s3c24xx_pcm_ops = {
375 .open = s3c24xx_pcm_open,
376 .close = s3c24xx_pcm_close,
377 .ioctl = snd_pcm_lib_ioctl,
378 .hw_params = s3c24xx_pcm_hw_params,
379 .hw_free = s3c24xx_pcm_hw_free,
380 .prepare = s3c24xx_pcm_prepare,
381 .trigger = s3c24xx_pcm_trigger,
382 .pointer = s3c24xx_pcm_pointer,
383 .mmap = s3c24xx_pcm_mmap,
384};
385
386static int s3c24xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
387{
388 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
389 struct snd_dma_buffer *buf = &substream->dma_buffer;
390 size_t size = s3c24xx_pcm_hardware.buffer_bytes_max;
391
392 pr_debug("Entered %s\n", __func__);
393
394 buf->dev.type = SNDRV_DMA_TYPE_DEV;
395 buf->dev.dev = pcm->card->dev;
396 buf->private_data = NULL;
397 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
398 &buf->addr, GFP_KERNEL);
399 if (!buf->area)
400 return -ENOMEM;
401 buf->bytes = size;
402 return 0;
403}
404
405static void s3c24xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
406{
407 struct snd_pcm_substream *substream;
408 struct snd_dma_buffer *buf;
409 int stream;
410
411 pr_debug("Entered %s\n", __func__);
412
413 for (stream = 0; stream < 2; stream++) {
414 substream = pcm->streams[stream].substream;
415 if (!substream)
416 continue;
417
418 buf = &substream->dma_buffer;
419 if (!buf->area)
420 continue;
421
422 dma_free_writecombine(pcm->card->dev, buf->bytes,
423 buf->area, buf->addr);
424 buf->area = NULL;
425 }
426}
427
428static u64 s3c24xx_pcm_dmamask = DMA_BIT_MASK(32);
429
430static int s3c24xx_pcm_new(struct snd_card *card,
431 struct snd_soc_dai *dai, struct snd_pcm *pcm)
432{
433 int ret = 0;
434
435 pr_debug("Entered %s\n", __func__);
436
437 if (!card->dev->dma_mask)
438 card->dev->dma_mask = &s3c24xx_pcm_dmamask;
439 if (!card->dev->coherent_dma_mask)
440 card->dev->coherent_dma_mask = 0xffffffff;
441
442 if (dai->playback.channels_min) {
443 ret = s3c24xx_pcm_preallocate_dma_buffer(pcm,
444 SNDRV_PCM_STREAM_PLAYBACK);
445 if (ret)
446 goto out;
447 }
448
449 if (dai->capture.channels_min) {
450 ret = s3c24xx_pcm_preallocate_dma_buffer(pcm,
451 SNDRV_PCM_STREAM_CAPTURE);
452 if (ret)
453 goto out;
454 }
455 out:
456 return ret;
457}
458
459struct snd_soc_platform s3c24xx_soc_platform = {
460 .name = "s3c24xx-audio",
461 .pcm_ops = &s3c24xx_pcm_ops,
462 .pcm_new = s3c24xx_pcm_new,
463 .pcm_free = s3c24xx_pcm_free_dma_buffers,
464};
465EXPORT_SYMBOL_GPL(s3c24xx_soc_platform);
466
467static int __init s3c24xx_soc_platform_init(void)
468{
469 return snd_soc_register_platform(&s3c24xx_soc_platform);
470}
471module_init(s3c24xx_soc_platform_init);
472
473static void __exit s3c24xx_soc_platform_exit(void)
474{
475 snd_soc_unregister_platform(&s3c24xx_soc_platform);
476}
477module_exit(s3c24xx_soc_platform_exit);
478
479MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
480MODULE_DESCRIPTION("Samsung S3C24XX PCM DMA module");
481MODULE_LICENSE("GPL");
482
