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authorBen Dooks <ben@simtec.co.uk>2007-02-14 07:20:03 -0500
committerJaroslav Kysela <perex@suse.cz>2007-05-11 10:55:37 -0400
commitc0f41bb1717ae31f806615e81b808753271dd3d9 (patch)
tree20bbb0cd90dc9a6b09b6c8fbba353d9d9677e2e2
parentc1422a6658ef6101fc5a979021487c732cb177a1 (diff)
[ALSA] ASoC Samsung S3C24xx audio DMA
This patch by Ben Dooks from Simtec Electronics adds ASoC audio DMA support for the Samsung S3C24xx CPU. Signed-off-by: Ben Dooks <ben@simtec.co.uk> Signed-off-by: Graeme Gregory <gg@opensource.wolfsonmicro.com> Signed-off-by: Liam Girdwood <lg@opensource.wolfsonmicro.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@suse.cz>
Diffstat
-rw-r--r--sound/soc/s3c24xx/s3c24xx-pcm.c462
-rw-r--r--sound/soc/s3c24xx/s3c24xx-pcm.h32
2 files changed, 494 insertions, 0 deletions
diff --git a/sound/soc/s3c24xx/s3c24xx-pcm.c b/sound/soc/s3c24xx/s3c24xx-pcm.c
new file mode 100644
index 000000000000..f1c0b9fa179c
--- /dev/null
+++ b/sound/soc/s3c24xx/s3c24xx-pcm.c
@@ -0,0 +1,462 @@
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 * (c) 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 * Revision history
17 * 11th Dec 2006 Merged with Simtec driver
18 * 10th Nov 2006 Initial version.
19 */
20
21#include <linux/module.h>
22#include <linux/init.h>
23#include <linux/platform_device.h>
24#include <linux/slab.h>
25#include <linux/dma-mapping.h>
26
27#include <sound/driver.h>
28#include <sound/core.h>
29#include <sound/pcm.h>
30#include <sound/pcm_params.h>
31#include <sound/soc.h>
32
33#include <asm/dma.h>
34#include <asm/io.h>
35#include <asm/hardware.h>
36#include <asm/arch/dma.h>
37#include <asm/arch/audio.h>
38
39#include "s3c24xx-pcm.h"
40
41#define S3C24XX_PCM_DEBUG 0
42#if S3C24XX_PCM_DEBUG
43#define DBG(x...) printk(KERN_DEBUG x)
44#else
45#define DBG(x...)
46#endif
47
48static const struct snd_pcm_hardware s3c24xx_pcm_hardware = {
49 .info = SNDRV_PCM_INFO_INTERLEAVED |
50 SNDRV_PCM_INFO_BLOCK_TRANSFER |
51 SNDRV_PCM_INFO_MMAP |
52 SNDRV_PCM_INFO_MMAP_VALID,
53 .formats = SNDRV_PCM_FMTBIT_S16_LE |
54 SNDRV_PCM_FMTBIT_U16_LE |
55 SNDRV_PCM_FMTBIT_U8 |
56 SNDRV_PCM_FMTBIT_S8,
57 .channels_min = 2,
58 .channels_max = 2,
59 .buffer_bytes_max = 128*1024,
60 .period_bytes_min = PAGE_SIZE,
61 .period_bytes_max = PAGE_SIZE*2,
62 .periods_min = 2,
63 .periods_max = 128,
64 .fifo_size = 32,
65};
66
67struct s3c24xx_runtime_data {
68 spinlock_t lock;
69 int state;
70 unsigned int dma_loaded;
71 unsigned int dma_limit;
72 unsigned int dma_period;
73 dma_addr_t dma_start;
74 dma_addr_t dma_pos;
75 dma_addr_t dma_end;
76 struct s3c24xx_pcm_dma_params *params;
77};
78
79/* s3c24xx_pcm_enqueue
80 *
81 * place a dma buffer onto the queue for the dma system
82 * to handle.
83*/
84static void s3c24xx_pcm_enqueue(struct snd_pcm_substream *substream)
85{
86 struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
87 dma_addr_t pos = prtd->dma_pos;
88 int ret;
89
90 DBG("Entered %s\n", __FUNCTION__);
91
92 while ( prtd->dma_loaded < prtd->dma_limit) {
93 unsigned long len = prtd->dma_period;
94
95 DBG("dma_loaded: %d\n",prtd->dma_loaded);
96
97 if ((pos + len) > prtd->dma_end) {
98 len = prtd->dma_end - pos;
99 DBG(KERN_DEBUG "%s: corrected dma len %ld\n",
100 __FUNCTION__, len);
101 }
102
103 ret = s3c2410_dma_enqueue(prtd->params->channel, substream, pos, len);
104
105 if (ret == 0) {
106 prtd->dma_loaded++;
107 pos += prtd->dma_period;
108 if (pos >= prtd->dma_end)
109 pos = prtd->dma_start;
110 } else
111 break;
112 }
113
114 prtd->dma_pos = pos;
115}
116
117static void s3c24xx_audio_buffdone(struct s3c2410_dma_chan *channel,
118 void *dev_id, int size,
119 enum s3c2410_dma_buffresult result)
120{
121 struct snd_pcm_substream *substream = dev_id;
122 struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
123
124 DBG("Entered %s\n", __FUNCTION__);
125
126 if (result == S3C2410_RES_ABORT || result == S3C2410_RES_ERR)
127 return;
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
141static 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", __FUNCTION__);
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 /* prepare DMA */
159 prtd->params = dma;
160
161 DBG("params %p, client %p, channel %d\n", prtd->params,
162 prtd->params->client, prtd->params->channel);
163
164 ret = s3c2410_dma_request(prtd->params->channel,
165 prtd->params->client, NULL);
166
167 if (ret) {
168 DBG(KERN_ERR "failed to get dma channel\n");
169 return ret;
170 }
171
172 /* channel needs configuring for mem=>device, increment memory addr,
173 * sync to pclk, half-word transfers to the IIS-FIFO. */
174 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
175 s3c2410_dma_devconfig(prtd->params->channel,
176 S3C2410_DMASRC_MEM, S3C2410_DISRCC_INC |
177 S3C2410_DISRCC_APB, prtd->params->dma_addr);
178
179 s3c2410_dma_config(prtd->params->channel,
180 2, S3C2410_DCON_SYNC_PCLK | S3C2410_DCON_HANDSHAKE);
181 } else {
182 s3c2410_dma_config(prtd->params->channel,
183 2, S3C2410_DCON_HANDSHAKE | S3C2410_DCON_SYNC_PCLK);
184
185 s3c2410_dma_devconfig(prtd->params->channel,
186 S3C2410_DMASRC_HW, 0x3,
187 prtd->params->dma_addr);
188 }
189
190 s3c2410_dma_set_buffdone_fn(prtd->params->channel,
191 s3c24xx_audio_buffdone);
192
193 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
194
195 runtime->dma_bytes = totbytes;
196
197 spin_lock_irq(&prtd->lock);
198 prtd->dma_loaded = 0;
199 prtd->dma_limit = runtime->hw.periods_min;
200 prtd->dma_period = params_period_bytes(params);
201 prtd->dma_start = runtime->dma_addr;
202 prtd->dma_pos = prtd->dma_start;
203 prtd->dma_end = prtd->dma_start + totbytes;
204 spin_unlock_irq(&prtd->lock);
205
206 return 0;
207}
208
209static int s3c24xx_pcm_hw_free(struct snd_pcm_substream *substream)
210{
211 struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
212
213 DBG("Entered %s\n", __FUNCTION__);
214
215 /* TODO - do we need to ensure DMA flushed */
216 snd_pcm_set_runtime_buffer(substream, NULL);
217
218 if(prtd->params) {
219 s3c2410_dma_free(prtd->params->channel, prtd->params->client);
220 prtd->params = NULL;
221 }
222
223 return 0;
224}
225
226static int s3c24xx_pcm_prepare(struct snd_pcm_substream *substream)
227{
228 struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
229 int ret = 0;
230
231 DBG("Entered %s\n", __FUNCTION__);
232
233 /* return if this is a bufferless transfer e.g.
234 * codec <--> BT codec or GSM modem -- lg FIXME */
235 if (!prtd->params)
236 return 0;
237
238 /* flush the DMA channel */
239 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_FLUSH);
240 prtd->dma_loaded = 0;
241 prtd->dma_pos = prtd->dma_start;
242
243 /* enqueue dma buffers */
244 s3c24xx_pcm_enqueue(substream);
245
246 return ret;
247}
248
249static int s3c24xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
250{
251 struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
252 int ret = 0;
253
254 DBG("Entered %s\n", __FUNCTION__);
255
256 spin_lock(&prtd->lock);
257
258 switch (cmd) {
259 case SNDRV_PCM_TRIGGER_START:
260 case SNDRV_PCM_TRIGGER_RESUME:
261 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
262 prtd->state |= ST_RUNNING;
263 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_START);
264 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STARTED);
265 break;
266
267 case SNDRV_PCM_TRIGGER_STOP:
268 case SNDRV_PCM_TRIGGER_SUSPEND:
269 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
270 prtd->state &= ~ST_RUNNING;
271 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STOP);
272 break;
273
274 default:
275 ret = -EINVAL;
276 break;
277 }
278
279 spin_unlock(&prtd->lock);
280
281 return ret;
282}
283
284static snd_pcm_uframes_t s3c24xx_pcm_pointer(struct snd_pcm_substream *substream)
285{
286 struct snd_pcm_runtime *runtime = substream->runtime;
287 struct s3c24xx_runtime_data *prtd = runtime->private_data;
288 unsigned long res;
289 dma_addr_t src, dst;
290
291 DBG("Entered %s\n", __FUNCTION__);
292
293 spin_lock(&prtd->lock);
294 s3c2410_dma_getposition(prtd->params->channel, &src, &dst);
295
296 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
297 res = dst - prtd->dma_start;
298 else
299 res = src - prtd->dma_start;
300
301 spin_unlock(&prtd->lock);
302
303 DBG("Pointer %x %x\n",src,dst);
304
305 /* we seem to be getting the odd error from the pcm library due
306 * to out-of-bounds pointers. this is maybe due to the dma engine
307 * not having loaded the new values for the channel before being
308 * callled... (todo - fix )
309 */
310
311 if (res >= snd_pcm_lib_buffer_bytes(substream)) {
312 if (res == snd_pcm_lib_buffer_bytes(substream))
313 res = 0;
314 }
315
316 return bytes_to_frames(substream->runtime, res);
317}
318
319static int s3c24xx_pcm_open(struct snd_pcm_substream *substream)
320{
321 struct snd_pcm_runtime *runtime = substream->runtime;
322 struct s3c24xx_runtime_data *prtd;
323
324 int ret;
325
326 DBG("Entered %s\n", __FUNCTION__);
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 runtime->private_data = prtd;
335 return 0;
336}
337
338static int s3c24xx_pcm_close(struct snd_pcm_substream *substream)
339{
340 struct snd_pcm_runtime *runtime = substream->runtime;
341 struct s3c24xx_runtime_data *prtd = runtime->private_data;
342
343 DBG("Entered %s\n", __FUNCTION__);
344
345 if(prtd)
346 kfree(prtd);
347 else
348 DBG("s3c24xx_pcm_close called with prtd == NULL\n");
349
350 return 0;
351}
352
353static int s3c24xx_pcm_mmap(struct snd_pcm_substream *substream,
354 struct vm_area_struct *vma)
355{
356 struct snd_pcm_runtime *runtime = substream->runtime;
357
358 DBG("Entered %s\n", __FUNCTION__);
359
360 return dma_mmap_writecombine(substream->pcm->card->dev, vma,
361 runtime->dma_area,
362 runtime->dma_addr,
363 runtime->dma_bytes);
364}
365
366static struct snd_pcm_ops s3c24xx_pcm_ops = {
367 .open = s3c24xx_pcm_open,
368 .close = s3c24xx_pcm_close,
369 .ioctl = snd_pcm_lib_ioctl,
370 .hw_params = s3c24xx_pcm_hw_params,
371 .hw_free = s3c24xx_pcm_hw_free,
372 .prepare = s3c24xx_pcm_prepare,
373 .trigger = s3c24xx_pcm_trigger,
374 .pointer = s3c24xx_pcm_pointer,
375 .mmap = s3c24xx_pcm_mmap,
376};
377
378static int s3c24xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
379{
380 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
381 struct snd_dma_buffer *buf = &substream->dma_buffer;
382 size_t size = s3c24xx_pcm_hardware.buffer_bytes_max;
383
384 DBG("Entered %s\n", __FUNCTION__);
385
386 buf->dev.type = SNDRV_DMA_TYPE_DEV;
387 buf->dev.dev = pcm->card->dev;
388 buf->private_data = NULL;
389 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
390 &buf->addr, GFP_KERNEL);
391 if (!buf->area)
392 return -ENOMEM;
393 buf->bytes = size;
394 return 0;
395}
396
397static void s3c24xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
398{
399 struct snd_pcm_substream *substream;
400 struct snd_dma_buffer *buf;
401 int stream;
402
403 DBG("Entered %s\n", __FUNCTION__);
404
405 for (stream = 0; stream < 2; stream++) {
406 substream = pcm->streams[stream].substream;
407 if (!substream)
408 continue;
409
410 buf = &substream->dma_buffer;
411 if (!buf->area)
412 continue;
413
414 dma_free_writecombine(pcm->card->dev, buf->bytes,
415 buf->area, buf->addr);
416 buf->area = NULL;
417 }
418}
419
420static u64 s3c24xx_pcm_dmamask = DMA_32BIT_MASK;
421
422static int s3c24xx_pcm_new(struct snd_card *card, struct snd_soc_codec_dai *dai,
423 struct snd_pcm *pcm)
424{
425 int ret = 0;
426
427 DBG("Entered %s\n", __FUNCTION__);
428
429 if (!card->dev->dma_mask)
430 card->dev->dma_mask = &s3c24xx_pcm_dmamask;
431 if (!card->dev->coherent_dma_mask)
432 card->dev->coherent_dma_mask = 0xffffffff;
433
434 if (dai->playback.channels_min) {
435 ret = s3c24xx_pcm_preallocate_dma_buffer(pcm,
436 SNDRV_PCM_STREAM_PLAYBACK);
437 if (ret)
438 goto out;
439 }
440
441 if (dai->capture.channels_min) {
442 ret = s3c24xx_pcm_preallocate_dma_buffer(pcm,
443 SNDRV_PCM_STREAM_CAPTURE);
444 if (ret)
445 goto out;
446 }
447 out:
448 return ret;
449}
450
451struct snd_soc_platform s3c24xx_soc_platform = {
452 .name = "s3c24xx-audio",
453 .pcm_ops = &s3c24xx_pcm_ops,
454 .pcm_new = s3c24xx_pcm_new,
455 .pcm_free = s3c24xx_pcm_free_dma_buffers,
456};
457
458EXPORT_SYMBOL_GPL(s3c24xx_soc_platform);
459
460MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
461MODULE_DESCRIPTION("Samsung S3C24XX PCM DMA module");
462MODULE_LICENSE("GPL");
diff --git a/sound/soc/s3c24xx/s3c24xx-pcm.h b/sound/soc/s3c24xx/s3c24xx-pcm.h
new file mode 100644
index 000000000000..5dced4ab1932
--- /dev/null
+++ b/sound/soc/s3c24xx/s3c24xx-pcm.h
@@ -0,0 +1,32 @@
1/*
2 * s3c24xx-pcm.h --
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or (at your
7 * option) any later version.
8 *
9 * ALSA PCM interface for the Samsung S3C24xx CPU
10 */
11
12#ifndef _S3C24XX_PCM_H
13#define _S3C24XX_PCM_H
14
15#define ST_RUNNING (1<<0)
16#define ST_OPENED (1<<1)
17
18struct s3c24xx_pcm_dma_params {
19 struct s3c2410_dma_client *client; /* stream identifier */
20 int channel; /* Channel ID */
21 dma_addr_t dma_addr;
22};
23
24#define S3C24XX_DAI_I2S 0
25
26extern struct snd_soc_cpu_dai s3c24xx_i2s_dai;
27
28/* platform data */
29extern struct snd_soc_platform s3c24xx_soc_platform;
30extern struct snd_ac97_bus_ops s3c24xx_ac97_ops;
31
32#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-25 20:03:52 -0500