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Linux 2.6.31.8
[linux/fpc-iii.git] / sound / soc / s3c24xx / s3c24xx-pcm.c
blobeecfa5eba06b0bf0b450d518368df1fe90cc52f6
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 static 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
57 struct 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 /* s3c24xx_pcm_enqueue
70 *
71 * place a dma buffer onto the queue for the dma system
72 * to handle.
73 */
74 static 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 int ret;
79
80 pr_debug("Entered %s\n", __func__);
81
82 while (prtd->dma_loaded < prtd->dma_limit) {
83 unsigned long len = prtd->dma_period;
84
85 pr_debug("dma_loaded: %d\n", prtd->dma_loaded);
86
87 if ((pos + len) > prtd->dma_end) {
88 len = prtd->dma_end - pos;
89 pr_debug(KERN_DEBUG "%s: corrected dma len %ld\n",
90 __func__, len);
91 }
92
93 ret = s3c2410_dma_enqueue(prtd->params->channel,
94 substream, pos, len);
95
96 if (ret == 0) {
97 prtd->dma_loaded++;
98 pos += prtd->dma_period;
99 if (pos >= prtd->dma_end)
100 pos = prtd->dma_start;
101 } else
102 break;
103 }
104
105 prtd->dma_pos = pos;
106 }
107
108 static void s3c24xx_audio_buffdone(struct s3c2410_dma_chan *channel,
109 void *dev_id, int size,
110 enum s3c2410_dma_buffresult result)
111 {
112 struct snd_pcm_substream *substream = dev_id;
113 struct s3c24xx_runtime_data *prtd;
114
115 pr_debug("Entered %s\n", __func__);
116
117 if (result == S3C2410_RES_ABORT || result == S3C2410_RES_ERR)
118 return;
119
120 prtd = substream->runtime->private_data;
121
122 if (substream)
123 snd_pcm_period_elapsed(substream);
124
125 spin_lock(&prtd->lock);
126 if (prtd->state & ST_RUNNING) {
127 prtd->dma_loaded--;
128 s3c24xx_pcm_enqueue(substream);
129 }
130
131 spin_unlock(&prtd->lock);
132 }
133
134 static int s3c24xx_pcm_hw_params(struct snd_pcm_substream *substream,
135 struct snd_pcm_hw_params *params)
136 {
137 struct snd_pcm_runtime *runtime = substream->runtime;
138 struct s3c24xx_runtime_data *prtd = runtime->private_data;
139 struct snd_soc_pcm_runtime *rtd = substream->private_data;
140 struct s3c24xx_pcm_dma_params *dma = rtd->dai->cpu_dai->dma_data;
141 unsigned long totbytes = params_buffer_bytes(params);
142 int ret = 0;
143
144 pr_debug("Entered %s\n", __func__);
145
146 /* return if this is a bufferless transfer e.g.
147 * codec <--> BT codec or GSM modem -- lg FIXME */
148 if (!dma)
149 return 0;
150
151 /* this may get called several times by oss emulation
152 * with different params -HW */
153 if (prtd->params == NULL) {
154 /* prepare DMA */
155 prtd->params = dma;
156
157 pr_debug("params %p, client %p, channel %d\n", prtd->params,
158 prtd->params->client, prtd->params->channel);
159
160 ret = s3c2410_dma_request(prtd->params->channel,
161 prtd->params->client, NULL);
162
163 if (ret < 0) {
164 printk(KERN_ERR "failed to get dma channel\n");
165 return ret;
166 }
167 }
168
169 s3c2410_dma_set_buffdone_fn(prtd->params->channel,
170 s3c24xx_audio_buffdone);
171
172 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
173
174 runtime->dma_bytes = totbytes;
175
176 spin_lock_irq(&prtd->lock);
177 prtd->dma_loaded = 0;
178 prtd->dma_limit = runtime->hw.periods_min;
179 prtd->dma_period = params_period_bytes(params);
180 prtd->dma_start = runtime->dma_addr;
181 prtd->dma_pos = prtd->dma_start;
182 prtd->dma_end = prtd->dma_start + totbytes;
183 spin_unlock_irq(&prtd->lock);
184
185 return 0;
186 }
187
188 static int s3c24xx_pcm_hw_free(struct snd_pcm_substream *substream)
189 {
190 struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
191
192 pr_debug("Entered %s\n", __func__);
193
194 /* TODO - do we need to ensure DMA flushed */
195 snd_pcm_set_runtime_buffer(substream, NULL);
196
197 if (prtd->params) {
198 s3c2410_dma_free(prtd->params->channel, prtd->params->client);
199 prtd->params = NULL;
200 }
201
202 return 0;
203 }
204
205 static int s3c24xx_pcm_prepare(struct snd_pcm_substream *substream)
206 {
207 struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
208 int ret = 0;
209
210 pr_debug("Entered %s\n", __func__);
211
212 /* return if this is a bufferless transfer e.g.
213 * codec <--> BT codec or GSM modem -- lg FIXME */
214 if (!prtd->params)
215 return 0;
216
217 /* channel needs configuring for mem=>device, increment memory addr,
218 * sync to pclk, half-word transfers to the IIS-FIFO. */
219 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
220 s3c2410_dma_devconfig(prtd->params->channel,
221 S3C2410_DMASRC_MEM,
222 prtd->params->dma_addr);
223 } else {
224 s3c2410_dma_devconfig(prtd->params->channel,
225 S3C2410_DMASRC_HW,
226 prtd->params->dma_addr);
227 }
228
229 s3c2410_dma_config(prtd->params->channel,
230 prtd->params->dma_size);
231
232 /* flush the DMA channel */
233 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_FLUSH);
234 prtd->dma_loaded = 0;
235 prtd->dma_pos = prtd->dma_start;
236
237 /* enqueue dma buffers */
238 s3c24xx_pcm_enqueue(substream);
239
240 return ret;
241 }
242
243 static int s3c24xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
244 {
245 struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
246 int ret = 0;
247
248 pr_debug("Entered %s\n", __func__);
249
250 spin_lock(&prtd->lock);
251
252 switch (cmd) {
253 case SNDRV_PCM_TRIGGER_START:
254 case SNDRV_PCM_TRIGGER_RESUME:
255 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
256 prtd->state |= ST_RUNNING;
257 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_START);
258 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STARTED);
259 break;
260
261 case SNDRV_PCM_TRIGGER_STOP:
262 case SNDRV_PCM_TRIGGER_SUSPEND:
263 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
264 prtd->state &= ~ST_RUNNING;
265 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STOP);
266 break;
267
268 default:
269 ret = -EINVAL;
270 break;
271 }
272
273 spin_unlock(&prtd->lock);
274
275 return ret;
276 }
277
278 static snd_pcm_uframes_t
279 s3c24xx_pcm_pointer(struct snd_pcm_substream *substream)
280 {
281 struct snd_pcm_runtime *runtime = substream->runtime;
282 struct s3c24xx_runtime_data *prtd = runtime->private_data;
283 unsigned long res;
284 dma_addr_t src, dst;
285
286 pr_debug("Entered %s\n", __func__);
287
288 spin_lock(&prtd->lock);
289 s3c2410_dma_getposition(prtd->params->channel, &src, &dst);
290
291 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
292 res = dst - prtd->dma_start;
293 else
294 res = src - prtd->dma_start;
295
296 spin_unlock(&prtd->lock);
297
298 pr_debug("Pointer %x %x\n", src, dst);
299
300 /* we seem to be getting the odd error from the pcm library due
301 * to out-of-bounds pointers. this is maybe due to the dma engine
302 * not having loaded the new values for the channel before being
303 * callled... (todo - fix )
304 */
305
306 if (res >= snd_pcm_lib_buffer_bytes(substream)) {
307 if (res == snd_pcm_lib_buffer_bytes(substream))
308 res = 0;
309 }
310
311 return bytes_to_frames(substream->runtime, res);
312 }
313
314 static int s3c24xx_pcm_open(struct snd_pcm_substream *substream)
315 {
316 struct snd_pcm_runtime *runtime = substream->runtime;
317 struct s3c24xx_runtime_data *prtd;
318
319 pr_debug("Entered %s\n", __func__);
320
321 snd_soc_set_runtime_hwparams(substream, &s3c24xx_pcm_hardware);
322
323 prtd = kzalloc(sizeof(struct s3c24xx_runtime_data), GFP_KERNEL);
324 if (prtd == NULL)
325 return -ENOMEM;
326
327 spin_lock_init(&prtd->lock);
328
329 runtime->private_data = prtd;
330 return 0;
331 }
332
333 static int s3c24xx_pcm_close(struct snd_pcm_substream *substream)
334 {
335 struct snd_pcm_runtime *runtime = substream->runtime;
336 struct s3c24xx_runtime_data *prtd = runtime->private_data;
337
338 pr_debug("Entered %s\n", __func__);
339
340 if (!prtd)
341 pr_debug("s3c24xx_pcm_close called with prtd == NULL\n");
342
343 kfree(prtd);
344
345 return 0;
346 }
347
348 static int s3c24xx_pcm_mmap(struct snd_pcm_substream *substream,
349 struct vm_area_struct *vma)
350 {
351 struct snd_pcm_runtime *runtime = substream->runtime;
352
353 pr_debug("Entered %s\n", __func__);
354
355 return dma_mmap_writecombine(substream->pcm->card->dev, vma,
356 runtime->dma_area,
357 runtime->dma_addr,
358 runtime->dma_bytes);
359 }
360
361 static struct snd_pcm_ops s3c24xx_pcm_ops = {
362 .open = s3c24xx_pcm_open,
363 .close = s3c24xx_pcm_close,
364 .ioctl = snd_pcm_lib_ioctl,
365 .hw_params = s3c24xx_pcm_hw_params,
366 .hw_free = s3c24xx_pcm_hw_free,
367 .prepare = s3c24xx_pcm_prepare,
368 .trigger = s3c24xx_pcm_trigger,
369 .pointer = s3c24xx_pcm_pointer,
370 .mmap = s3c24xx_pcm_mmap,
371 };
372
373 static int s3c24xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
374 {
375 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
376 struct snd_dma_buffer *buf = &substream->dma_buffer;
377 size_t size = s3c24xx_pcm_hardware.buffer_bytes_max;
378
379 pr_debug("Entered %s\n", __func__);
380
381 buf->dev.type = SNDRV_DMA_TYPE_DEV;
382 buf->dev.dev = pcm->card->dev;
383 buf->private_data = NULL;
384 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
385 &buf->addr, GFP_KERNEL);
386 if (!buf->area)
387 return -ENOMEM;
388 buf->bytes = size;
389 return 0;
390 }
391
392 static void s3c24xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
393 {
394 struct snd_pcm_substream *substream;
395 struct snd_dma_buffer *buf;
396 int stream;
397
398 pr_debug("Entered %s\n", __func__);
399
400 for (stream = 0; stream < 2; stream++) {
401 substream = pcm->streams[stream].substream;
402 if (!substream)
403 continue;
404
405 buf = &substream->dma_buffer;
406 if (!buf->area)
407 continue;
408
409 dma_free_writecombine(pcm->card->dev, buf->bytes,
410 buf->area, buf->addr);
411 buf->area = NULL;
412 }
413 }
414
415 static u64 s3c24xx_pcm_dmamask = DMA_BIT_MASK(32);
416
417 static int s3c24xx_pcm_new(struct snd_card *card,
418 struct snd_soc_dai *dai, struct snd_pcm *pcm)
419 {
420 int ret = 0;
421
422 pr_debug("Entered %s\n", __func__);
423
424 if (!card->dev->dma_mask)
425 card->dev->dma_mask = &s3c24xx_pcm_dmamask;
426 if (!card->dev->coherent_dma_mask)
427 card->dev->coherent_dma_mask = 0xffffffff;
428
429 if (dai->playback.channels_min) {
430 ret = s3c24xx_pcm_preallocate_dma_buffer(pcm,
431 SNDRV_PCM_STREAM_PLAYBACK);
432 if (ret)
433 goto out;
434 }
435
436 if (dai->capture.channels_min) {
437 ret = s3c24xx_pcm_preallocate_dma_buffer(pcm,
438 SNDRV_PCM_STREAM_CAPTURE);
439 if (ret)
440 goto out;
441 }
442 out:
443 return ret;
444 }
445
446 struct snd_soc_platform s3c24xx_soc_platform = {
447 .name = "s3c24xx-audio",
448 .pcm_ops = &s3c24xx_pcm_ops,
449 .pcm_new = s3c24xx_pcm_new,
450 .pcm_free = s3c24xx_pcm_free_dma_buffers,
451 };
452 EXPORT_SYMBOL_GPL(s3c24xx_soc_platform);
453
454 static int __init s3c24xx_soc_platform_init(void)
455 {
456 return snd_soc_register_platform(&s3c24xx_soc_platform);
457 }
458 module_init(s3c24xx_soc_platform_init);
459
460 static void __exit s3c24xx_soc_platform_exit(void)
461 {
462 snd_soc_unregister_platform(&s3c24xx_soc_platform);
463 }
464 module_exit(s3c24xx_soc_platform_exit);
465
466 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
467 MODULE_DESCRIPTION("Samsung S3C24XX PCM DMA module");
468 MODULE_LICENSE("GPL");
Linux with added FPC-III support