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MERGE-master-patchset-edits
[linux-2.6/openmoko-kernel.git] / sound / soc / s3c24xx / s3c24xx-pcm.c
blobe337c81a01a789297ed825456c708aa76d73c7d8
1 /*
2 * s3c24xx-pcm.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 #include <plat/audio.h>
33
34 #include "s3c24xx-pcm.h"
35
36 #define S3C24XX_PCM_DEBUG 0
37 #if S3C24XX_PCM_DEBUG
38 #define DBG(x...) printk(KERN_DEBUG "s3c24xx-pcm: " x)
39 #else
40 #define DBG(x...)
41 #endif
42
43 static const struct snd_pcm_hardware s3c24xx_pcm_hardware = {
44 .info = SNDRV_PCM_INFO_INTERLEAVED |
45 SNDRV_PCM_INFO_BLOCK_TRANSFER |
46 SNDRV_PCM_INFO_MMAP |
47 SNDRV_PCM_INFO_MMAP_VALID |
48 SNDRV_PCM_INFO_PAUSE |
49 SNDRV_PCM_INFO_RESUME,
50 .formats = SNDRV_PCM_FMTBIT_S16_LE |
51 SNDRV_PCM_FMTBIT_U16_LE |
52 SNDRV_PCM_FMTBIT_U8 |
53 SNDRV_PCM_FMTBIT_S8,
54 .channels_min = 2,
55 .channels_max = 2,
56 .buffer_bytes_max = 128*1024,
57 .period_bytes_min = PAGE_SIZE,
58 .period_bytes_max = PAGE_SIZE*2,
59 .periods_min = 2,
60 .periods_max = 128,
61 .fifo_size = 32,
62 };
63
64 struct s3c24xx_runtime_data {
65 spinlock_t lock;
66 int state;
67 unsigned int dma_loaded;
68 unsigned int dma_limit;
69 unsigned int dma_period;
70 dma_addr_t dma_start;
71 dma_addr_t dma_pos;
72 dma_addr_t dma_end;
73 struct s3c24xx_pcm_dma_params *params;
74 };
75
76 /* s3c24xx_pcm_enqueue
77 *
78 * place a dma buffer onto the queue for the dma system
79 * to handle.
80 */
81 static void s3c24xx_pcm_enqueue(struct snd_pcm_substream *substream)
82 {
83 struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
84 dma_addr_t pos = prtd->dma_pos;
85 int ret;
86
87 DBG("Entered %s\n", __func__);
88
89 while (prtd->dma_loaded < prtd->dma_limit) {
90 unsigned long len = prtd->dma_period;
91
92 DBG("dma_loaded: %d\n", prtd->dma_loaded);
93
94 if ((pos + len) > prtd->dma_end) {
95 len = prtd->dma_end - pos;
96 DBG(KERN_DEBUG "%s: corrected dma len %ld\n",
97 __func__, len);
98 }
99
100 ret = s3c2410_dma_enqueue(prtd->params->channel,
101 substream, pos, len);
102
103 if (ret == 0) {
104 prtd->dma_loaded++;
105 pos += prtd->dma_period;
106 if (pos >= prtd->dma_end)
107 pos = prtd->dma_start;
108 } else
109 break;
110 }
111
112 prtd->dma_pos = pos;
113 }
114
115 static void s3c24xx_audio_buffdone(struct s3c2410_dma_chan *channel,
116 void *dev_id, int size,
117 enum s3c2410_dma_buffresult result)
118 {
119 struct snd_pcm_substream *substream = dev_id;
120 struct s3c24xx_runtime_data *prtd;
121
122 DBG("Entered %s\n", __func__);
123
124 if (result == S3C2410_RES_ABORT || result == S3C2410_RES_ERR)
125 return;
126
127 prtd = substream->runtime->private_data;
128
129 if (substream)
130 snd_pcm_period_elapsed(substream);
131
132 spin_lock(&prtd->lock);
133 if (prtd->state & ST_RUNNING) {
134 prtd->dma_loaded--;
135 s3c24xx_pcm_enqueue(substream);
136 }
137
138 spin_unlock(&prtd->lock);
139 }
140
141 static int s3c24xx_pcm_hw_params(struct snd_pcm_substream *substream,
142 struct snd_pcm_hw_params *params)
143 {
144 struct snd_pcm_runtime *runtime = substream->runtime;
145 struct s3c24xx_runtime_data *prtd = runtime->private_data;
146 struct snd_soc_pcm_runtime *rtd = substream->private_data;
147 struct s3c24xx_pcm_dma_params *dma = rtd->dai->cpu_dai->dma_data;
148 unsigned long totbytes = params_buffer_bytes(params);
149 int ret = 0;
150
151 DBG("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 DBG("params %p, client %p, channel %d\n", prtd->params,
165 prtd->params->client, prtd->params->channel);
166
167 ret = s3c2410_dma_request(prtd->params->channel,
168 prtd->params->client, NULL);
169
170 if (ret < 0) {
171 DBG(KERN_ERR "failed to get dma channel\n");
172 return ret;
173 }
174 }
175
176 s3c2410_dma_set_buffdone_fn(prtd->params->channel,
177 s3c24xx_audio_buffdone);
178
179 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
180
181 runtime->dma_bytes = totbytes;
182
183 spin_lock_irq(&prtd->lock);
184 prtd->dma_loaded = 0;
185 prtd->dma_limit = runtime->hw.periods_min;
186 prtd->dma_period = params_period_bytes(params);
187 prtd->dma_start = runtime->dma_addr;
188 prtd->dma_pos = prtd->dma_start;
189 prtd->dma_end = prtd->dma_start + totbytes;
190 spin_unlock_irq(&prtd->lock);
191
192 return 0;
193 }
194
195 static int s3c24xx_pcm_hw_free(struct snd_pcm_substream *substream)
196 {
197 struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
198
199 DBG("Entered %s\n", __func__);
200
201 /* TODO - do we need to ensure DMA flushed */
202 snd_pcm_set_runtime_buffer(substream, NULL);
203
204 if (prtd->params) {
205 s3c2410_dma_free(prtd->params->channel, prtd->params->client);
206 prtd->params = NULL;
207 }
208
209 return 0;
210 }
211
212 static int s3c24xx_pcm_prepare(struct snd_pcm_substream *substream)
213 {
214 struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
215 int ret = 0;
216
217 DBG("Entered %s\n", __func__);
218
219 /* return if this is a bufferless transfer e.g.
220 * codec <--> BT codec or GSM modem -- lg FIXME */
221 if (!prtd->params)
222 return 0;
223
224 /* channel needs configuring for mem=>device, increment memory addr,
225 * sync to pclk, half-word transfers to the IIS-FIFO. */
226 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
227 s3c2410_dma_devconfig(prtd->params->channel,
228 S3C2410_DMASRC_MEM,
229 prtd->params->dma_addr);
230 } else {
231 s3c2410_dma_devconfig(prtd->params->channel,
232 S3C2410_DMASRC_HW,
233 prtd->params->dma_addr);
234 }
235
236 s3c2410_dma_config(prtd->params->channel,
237 prtd->params->dma_size);
238
239 /* flush the DMA channel */
240 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_FLUSH);
241 prtd->dma_loaded = 0;
242 prtd->dma_pos = prtd->dma_start;
243
244 /* enqueue dma buffers */
245 s3c24xx_pcm_enqueue(substream);
246
247 return ret;
248 }
249
250 static int s3c24xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
251 {
252 struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
253 int ret = 0;
254
255 DBG("Entered %s\n", __func__);
256
257 spin_lock(&prtd->lock);
258
259 switch (cmd) {
260 case SNDRV_PCM_TRIGGER_START:
261 case SNDRV_PCM_TRIGGER_RESUME:
262 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
263 prtd->state |= ST_RUNNING;
264 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_START);
265 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STARTED);
266 break;
267
268 case SNDRV_PCM_TRIGGER_STOP:
269 case SNDRV_PCM_TRIGGER_SUSPEND:
270 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
271 prtd->state &= ~ST_RUNNING;
272 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STOP);
273 break;
274
275 default:
276 ret = -EINVAL;
277 break;
278 }
279
280 spin_unlock(&prtd->lock);
281
282 return ret;
283 }
284
285 static snd_pcm_uframes_t
286 s3c24xx_pcm_pointer(struct snd_pcm_substream *substream)
287 {
288 struct snd_pcm_runtime *runtime = substream->runtime;
289 struct s3c24xx_runtime_data *prtd = runtime->private_data;
290 unsigned long res;
291 dma_addr_t src, dst;
292
293 DBG("Entered %s\n", __func__);
294
295 spin_lock(&prtd->lock);
296 s3c2410_dma_getposition(prtd->params->channel, &src, &dst);
297
298 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
299 res = dst - prtd->dma_start;
300 else
301 res = src - prtd->dma_start;
302
303 spin_unlock(&prtd->lock);
304
305 DBG("Pointer %x %x\n", src, dst);
306
307 /* we seem to be getting the odd error from the pcm library due
308 * to out-of-bounds pointers. this is maybe due to the dma engine
309 * not having loaded the new values for the channel before being
310 * callled... (todo - fix )
311 */
312
313 if (res >= snd_pcm_lib_buffer_bytes(substream)) {
314 if (res == snd_pcm_lib_buffer_bytes(substream))
315 res = 0;
316 }
317
318 return bytes_to_frames(substream->runtime, res);
319 }
320
321 static int s3c24xx_pcm_open(struct snd_pcm_substream *substream)
322 {
323 struct snd_pcm_runtime *runtime = substream->runtime;
324 struct s3c24xx_runtime_data *prtd;
325
326 DBG("Entered %s\n", __func__);
327
328 snd_soc_set_runtime_hwparams(substream, &s3c24xx_pcm_hardware);
329
330 prtd = kzalloc(sizeof(struct s3c24xx_runtime_data), GFP_KERNEL);
331 if (prtd == NULL)
332 return -ENOMEM;
333
334 spin_lock_init(&prtd->lock);
335
336 runtime->private_data = prtd;
337 return 0;
338 }
339
340 static int s3c24xx_pcm_close(struct snd_pcm_substream *substream)
341 {
342 struct snd_pcm_runtime *runtime = substream->runtime;
343 struct s3c24xx_runtime_data *prtd = runtime->private_data;
344
345 DBG("Entered %s\n", __func__);
346
347 if (!prtd)
348 DBG("s3c24xx_pcm_close called with prtd == NULL\n");
349
350 kfree(prtd);
351
352 return 0;
353 }
354
355 static int s3c24xx_pcm_mmap(struct snd_pcm_substream *substream,
356 struct vm_area_struct *vma)
357 {
358 struct snd_pcm_runtime *runtime = substream->runtime;
359
360 DBG("Entered %s\n", __func__);
361
362 return dma_mmap_writecombine(substream->pcm->card->dev, vma,
363 runtime->dma_area,
364 runtime->dma_addr,
365 runtime->dma_bytes);
366 }
367
368 static struct snd_pcm_ops s3c24xx_pcm_ops = {
369 .open = s3c24xx_pcm_open,
370 .close = s3c24xx_pcm_close,
371 .ioctl = snd_pcm_lib_ioctl,
372 .hw_params = s3c24xx_pcm_hw_params,
373 .hw_free = s3c24xx_pcm_hw_free,
374 .prepare = s3c24xx_pcm_prepare,
375 .trigger = s3c24xx_pcm_trigger,
376 .pointer = s3c24xx_pcm_pointer,
377 .mmap = s3c24xx_pcm_mmap,
378 };
379
380 static int s3c24xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
381 {
382 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
383 struct snd_dma_buffer *buf = &substream->dma_buffer;
384 size_t size = s3c24xx_pcm_hardware.buffer_bytes_max;
385
386 DBG("Entered %s\n", __func__);
387
388 buf->dev.type = SNDRV_DMA_TYPE_DEV;
389 buf->dev.dev = pcm->card->dev;
390 buf->private_data = NULL;
391 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
392 &buf->addr, GFP_KERNEL);
393 if (!buf->area)
394 return -ENOMEM;
395 buf->bytes = size;
396 return 0;
397 }
398
399 static void s3c24xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
400 {
401 struct snd_pcm_substream *substream;
402 struct snd_dma_buffer *buf;
403 int stream;
404
405 DBG("Entered %s\n", __func__);
406
407 for (stream = 0; stream < 2; stream++) {
408 substream = pcm->streams[stream].substream;
409 if (!substream)
410 continue;
411
412 buf = &substream->dma_buffer;
413 if (!buf->area)
414 continue;
415
416 dma_free_writecombine(pcm->card->dev, buf->bytes,
417 buf->area, buf->addr);
418 buf->area = NULL;
419 }
420 }
421
422 static u64 s3c24xx_pcm_dmamask = DMA_32BIT_MASK;
423
424 static int s3c24xx_pcm_new(struct snd_card *card,
425 struct snd_soc_dai *dai, struct snd_pcm *pcm)
426 {
427 int ret = 0;
428
429 DBG("Entered %s\n", __func__);
430
431 if (!card->dev->dma_mask)
432 card->dev->dma_mask = &s3c24xx_pcm_dmamask;
433 if (!card->dev->coherent_dma_mask)
434 card->dev->coherent_dma_mask = 0xffffffff;
435
436 if (dai->playback.channels_min) {
437 ret = s3c24xx_pcm_preallocate_dma_buffer(pcm,
438 SNDRV_PCM_STREAM_PLAYBACK);
439 if (ret)
440 goto out;
441 }
442
443 if (dai->capture.channels_min) {
444 ret = s3c24xx_pcm_preallocate_dma_buffer(pcm,
445 SNDRV_PCM_STREAM_CAPTURE);
446 if (ret)
447 goto out;
448 }
449 out:
450 return ret;
451 }
452
453 struct snd_soc_platform s3c24xx_soc_platform = {
454 .name = "s3c24xx-audio",
455 .pcm_ops = &s3c24xx_pcm_ops,
456 .pcm_new = s3c24xx_pcm_new,
457 .pcm_free = s3c24xx_pcm_free_dma_buffers,
458 };
459 EXPORT_SYMBOL_GPL(s3c24xx_soc_platform);
460
461 static int __init s3c24xx_soc_platform_init(void)
462 {
463 return snd_soc_register_platform(&s3c24xx_soc_platform);
464 }
465 module_init(s3c24xx_soc_platform_init);
466
467 static void __exit s3c24xx_soc_platform_exit(void)
468 {
469 snd_soc_unregister_platform(&s3c24xx_soc_platform);
470 }
471 module_exit(s3c24xx_soc_platform_exit);
472
473 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
474 MODULE_DESCRIPTION("Samsung S3C24XX PCM DMA module");
475 MODULE_LICENSE("GPL");
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