Merge branch 'tracing/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6] / sound / soc / s3c24xx / s3c24xx-pcm.c
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
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 <asm/hardware.h>
31 #include <asm/arch/dma.h>
32 #include <asm/arch/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, S3C2410_DISRCC_INC |
229                                 S3C2410_DISRCC_APB, prtd->params->dma_addr);
230
231                 s3c2410_dma_config(prtd->params->channel,
232                                 prtd->params->dma_size,
233                                 S3C2410_DCON_SYNC_PCLK |
234                                 S3C2410_DCON_HANDSHAKE);
235         } else {
236                 s3c2410_dma_config(prtd->params->channel,
237                                 prtd->params->dma_size,
238                                 S3C2410_DCON_HANDSHAKE |
239                                 S3C2410_DCON_SYNC_PCLK);
240
241                 s3c2410_dma_devconfig(prtd->params->channel,
242                                         S3C2410_DMASRC_HW, 0x3,
243                                         prtd->params->dma_addr);
244         }
245
246         /* flush the DMA channel */
247         s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_FLUSH);
248         prtd->dma_loaded = 0;
249         prtd->dma_pos = prtd->dma_start;
250
251         /* enqueue dma buffers */
252         s3c24xx_pcm_enqueue(substream);
253
254         return ret;
255 }
256
257 static int s3c24xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
258 {
259         struct s3c24xx_runtime_data *prtd = substream->runtime->private_data;
260         int ret = 0;
261
262         DBG("Entered %s\n", __func__);
263
264         spin_lock(&prtd->lock);
265
266         switch (cmd) {
267         case SNDRV_PCM_TRIGGER_START:
268         case SNDRV_PCM_TRIGGER_RESUME:
269         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
270                 prtd->state |= ST_RUNNING;
271                 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_START);
272                 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STARTED);
273                 break;
274
275         case SNDRV_PCM_TRIGGER_STOP:
276         case SNDRV_PCM_TRIGGER_SUSPEND:
277         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
278                 prtd->state &= ~ST_RUNNING;
279                 s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STOP);
280                 break;
281
282         default:
283                 ret = -EINVAL;
284                 break;
285         }
286
287         spin_unlock(&prtd->lock);
288
289         return ret;
290 }
291
292 static snd_pcm_uframes_t
293 s3c24xx_pcm_pointer(struct snd_pcm_substream *substream)
294 {
295         struct snd_pcm_runtime *runtime = substream->runtime;
296         struct s3c24xx_runtime_data *prtd = runtime->private_data;
297         unsigned long res;
298         dma_addr_t src, dst;
299
300         DBG("Entered %s\n", __func__);
301
302         spin_lock(&prtd->lock);
303         s3c2410_dma_getposition(prtd->params->channel, &src, &dst);
304
305         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
306                 res = dst - prtd->dma_start;
307         else
308                 res = src - prtd->dma_start;
309
310         spin_unlock(&prtd->lock);
311
312         DBG("Pointer %x %x\n", src, dst);
313
314         /* we seem to be getting the odd error from the pcm library due
315          * to out-of-bounds pointers. this is maybe due to the dma engine
316          * not having loaded the new values for the channel before being
317          * callled... (todo - fix )
318          */
319
320         if (res >= snd_pcm_lib_buffer_bytes(substream)) {
321                 if (res == snd_pcm_lib_buffer_bytes(substream))
322                         res = 0;
323         }
324
325         return bytes_to_frames(substream->runtime, res);
326 }
327
328 static int s3c24xx_pcm_open(struct snd_pcm_substream *substream)
329 {
330         struct snd_pcm_runtime *runtime = substream->runtime;
331         struct s3c24xx_runtime_data *prtd;
332
333         DBG("Entered %s\n", __func__);
334
335         snd_soc_set_runtime_hwparams(substream, &s3c24xx_pcm_hardware);
336
337         prtd = kzalloc(sizeof(struct s3c24xx_runtime_data), GFP_KERNEL);
338         if (prtd == NULL)
339                 return -ENOMEM;
340
341         spin_lock_init(&prtd->lock);
342
343         runtime->private_data = prtd;
344         return 0;
345 }
346
347 static int s3c24xx_pcm_close(struct snd_pcm_substream *substream)
348 {
349         struct snd_pcm_runtime *runtime = substream->runtime;
350         struct s3c24xx_runtime_data *prtd = runtime->private_data;
351
352         DBG("Entered %s\n", __func__);
353
354         if (!prtd)
355                 DBG("s3c24xx_pcm_close called with prtd == NULL\n");
356
357         kfree(prtd);
358
359         return 0;
360 }
361
362 static int s3c24xx_pcm_mmap(struct snd_pcm_substream *substream,
363         struct vm_area_struct *vma)
364 {
365         struct snd_pcm_runtime *runtime = substream->runtime;
366
367         DBG("Entered %s\n", __func__);
368
369         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
370                                      runtime->dma_area,
371                                      runtime->dma_addr,
372                                      runtime->dma_bytes);
373 }
374
375 static struct snd_pcm_ops s3c24xx_pcm_ops = {
376         .open           = s3c24xx_pcm_open,
377         .close          = s3c24xx_pcm_close,
378         .ioctl          = snd_pcm_lib_ioctl,
379         .hw_params      = s3c24xx_pcm_hw_params,
380         .hw_free        = s3c24xx_pcm_hw_free,
381         .prepare        = s3c24xx_pcm_prepare,
382         .trigger        = s3c24xx_pcm_trigger,
383         .pointer        = s3c24xx_pcm_pointer,
384         .mmap           = s3c24xx_pcm_mmap,
385 };
386
387 static int s3c24xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
388 {
389         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
390         struct snd_dma_buffer *buf = &substream->dma_buffer;
391         size_t size = s3c24xx_pcm_hardware.buffer_bytes_max;
392
393         DBG("Entered %s\n", __func__);
394
395         buf->dev.type = SNDRV_DMA_TYPE_DEV;
396         buf->dev.dev = pcm->card->dev;
397         buf->private_data = NULL;
398         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
399                                            &buf->addr, GFP_KERNEL);
400         if (!buf->area)
401                 return -ENOMEM;
402         buf->bytes = size;
403         return 0;
404 }
405
406 static void s3c24xx_pcm_free_dma_buffers(struct snd_pcm *pcm)
407 {
408         struct snd_pcm_substream *substream;
409         struct snd_dma_buffer *buf;
410         int stream;
411
412         DBG("Entered %s\n", __func__);
413
414         for (stream = 0; stream < 2; stream++) {
415                 substream = pcm->streams[stream].substream;
416                 if (!substream)
417                         continue;
418
419                 buf = &substream->dma_buffer;
420                 if (!buf->area)
421                         continue;
422
423                 dma_free_writecombine(pcm->card->dev, buf->bytes,
424                                       buf->area, buf->addr);
425                 buf->area = NULL;
426         }
427 }
428
429 static u64 s3c24xx_pcm_dmamask = DMA_32BIT_MASK;
430
431 static int s3c24xx_pcm_new(struct snd_card *card,
432         struct snd_soc_dai *dai, struct snd_pcm *pcm)
433 {
434         int ret = 0;
435
436         DBG("Entered %s\n", __func__);
437
438         if (!card->dev->dma_mask)
439                 card->dev->dma_mask = &s3c24xx_pcm_dmamask;
440         if (!card->dev->coherent_dma_mask)
441                 card->dev->coherent_dma_mask = 0xffffffff;
442
443         if (dai->playback.channels_min) {
444                 ret = s3c24xx_pcm_preallocate_dma_buffer(pcm,
445                         SNDRV_PCM_STREAM_PLAYBACK);
446                 if (ret)
447                         goto out;
448         }
449
450         if (dai->capture.channels_min) {
451                 ret = s3c24xx_pcm_preallocate_dma_buffer(pcm,
452                         SNDRV_PCM_STREAM_CAPTURE);
453                 if (ret)
454                         goto out;
455         }
456  out:
457         return ret;
458 }
459
460 struct snd_soc_platform s3c24xx_soc_platform = {
461         .name           = "s3c24xx-audio",
462         .pcm_ops        = &s3c24xx_pcm_ops,
463         .pcm_new        = s3c24xx_pcm_new,
464         .pcm_free       = s3c24xx_pcm_free_dma_buffers,
465 };
466 EXPORT_SYMBOL_GPL(s3c24xx_soc_platform);
467
468 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
469 MODULE_DESCRIPTION("Samsung S3C24XX PCM DMA module");
470 MODULE_LICENSE("GPL");