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c0f41bb1 BD |
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 | ||
48 | static 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 | ||
67 | struct 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 | */ | |
84 | static 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 | ||
7f1bc26e | 92 | while (prtd->dma_loaded < prtd->dma_limit) { |
c0f41bb1 BD |
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 | ||
7f1bc26e GG |
103 | ret = s3c2410_dma_enqueue(prtd->params->channel, |
104 | substream, pos, len); | |
c0f41bb1 BD |
105 | |
106 | if (ret == 0) { | |
107 | prtd->dma_loaded++; | |
108 | pos += prtd->dma_period; | |
109 | if (pos >= prtd->dma_end) | |
110 | pos = prtd->dma_start; | |
111 | } else | |
112 | break; | |
113 | } | |
114 | ||
115 | prtd->dma_pos = pos; | |
116 | } | |
117 | ||
118 | static void s3c24xx_audio_buffdone(struct s3c2410_dma_chan *channel, | |
7f1bc26e GG |
119 | void *dev_id, int size, |
120 | enum s3c2410_dma_buffresult result) | |
c0f41bb1 BD |
121 | { |
122 | struct snd_pcm_substream *substream = dev_id; | |
7f1bc26e | 123 | struct s3c24xx_runtime_data *prtd; |
c0f41bb1 BD |
124 | |
125 | DBG("Entered %s\n", __FUNCTION__); | |
126 | ||
127 | if (result == S3C2410_RES_ABORT || result == S3C2410_RES_ERR) | |
128 | return; | |
129 | ||
7f1bc26e GG |
130 | prtd = substream->runtime->private_data; |
131 | ||
c0f41bb1 BD |
132 | if (substream) |
133 | snd_pcm_period_elapsed(substream); | |
134 | ||
135 | spin_lock(&prtd->lock); | |
136 | if (prtd->state & ST_RUNNING) { | |
137 | prtd->dma_loaded--; | |
138 | s3c24xx_pcm_enqueue(substream); | |
139 | } | |
140 | ||
141 | spin_unlock(&prtd->lock); | |
142 | } | |
143 | ||
144 | static int s3c24xx_pcm_hw_params(struct snd_pcm_substream *substream, | |
145 | struct snd_pcm_hw_params *params) | |
146 | { | |
147 | struct snd_pcm_runtime *runtime = substream->runtime; | |
148 | struct s3c24xx_runtime_data *prtd = runtime->private_data; | |
149 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
150 | struct s3c24xx_pcm_dma_params *dma = rtd->dai->cpu_dai->dma_data; | |
151 | unsigned long totbytes = params_buffer_bytes(params); | |
152 | int ret=0; | |
153 | ||
154 | DBG("Entered %s\n", __FUNCTION__); | |
155 | ||
156 | /* return if this is a bufferless transfer e.g. | |
157 | * codec <--> BT codec or GSM modem -- lg FIXME */ | |
158 | if (!dma) | |
159 | return 0; | |
160 | ||
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) { | |
171 | DBG(KERN_ERR "failed to get dma channel\n"); | |
172 | return ret; | |
173 | } | |
174 | ||
175 | /* channel needs configuring for mem=>device, increment memory addr, | |
176 | * sync to pclk, half-word transfers to the IIS-FIFO. */ | |
177 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
178 | s3c2410_dma_devconfig(prtd->params->channel, | |
7f1bc26e GG |
179 | S3C2410_DMASRC_MEM, S3C2410_DISRCC_INC | |
180 | S3C2410_DISRCC_APB, prtd->params->dma_addr); | |
c0f41bb1 BD |
181 | |
182 | s3c2410_dma_config(prtd->params->channel, | |
7f1bc26e GG |
183 | prtd->params->dma_size, |
184 | S3C2410_DCON_SYNC_PCLK | | |
185 | S3C2410_DCON_HANDSHAKE); | |
c0f41bb1 BD |
186 | } else { |
187 | s3c2410_dma_config(prtd->params->channel, | |
7f1bc26e GG |
188 | prtd->params->dma_size, |
189 | S3C2410_DCON_HANDSHAKE | | |
190 | S3C2410_DCON_SYNC_PCLK); | |
c0f41bb1 BD |
191 | |
192 | s3c2410_dma_devconfig(prtd->params->channel, | |
7f1bc26e GG |
193 | S3C2410_DMASRC_HW, 0x3, |
194 | prtd->params->dma_addr); | |
c0f41bb1 BD |
195 | } |
196 | ||
197 | s3c2410_dma_set_buffdone_fn(prtd->params->channel, | |
198 | s3c24xx_audio_buffdone); | |
199 | ||
200 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); | |
201 | ||
202 | runtime->dma_bytes = totbytes; | |
203 | ||
204 | spin_lock_irq(&prtd->lock); | |
205 | prtd->dma_loaded = 0; | |
206 | prtd->dma_limit = runtime->hw.periods_min; | |
207 | prtd->dma_period = params_period_bytes(params); | |
208 | prtd->dma_start = runtime->dma_addr; | |
209 | prtd->dma_pos = prtd->dma_start; | |
210 | prtd->dma_end = prtd->dma_start + totbytes; | |
211 | spin_unlock_irq(&prtd->lock); | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
216 | static int s3c24xx_pcm_hw_free(struct snd_pcm_substream *substream) | |
217 | { | |
218 | struct s3c24xx_runtime_data *prtd = substream->runtime->private_data; | |
219 | ||
220 | DBG("Entered %s\n", __FUNCTION__); | |
221 | ||
222 | /* TODO - do we need to ensure DMA flushed */ | |
223 | snd_pcm_set_runtime_buffer(substream, NULL); | |
224 | ||
7f1bc26e | 225 | if (prtd->params) { |
c0f41bb1 BD |
226 | s3c2410_dma_free(prtd->params->channel, prtd->params->client); |
227 | prtd->params = NULL; | |
228 | } | |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
233 | static int s3c24xx_pcm_prepare(struct snd_pcm_substream *substream) | |
234 | { | |
235 | struct s3c24xx_runtime_data *prtd = substream->runtime->private_data; | |
236 | int ret = 0; | |
237 | ||
238 | DBG("Entered %s\n", __FUNCTION__); | |
239 | ||
240 | /* return if this is a bufferless transfer e.g. | |
241 | * codec <--> BT codec or GSM modem -- lg FIXME */ | |
242 | if (!prtd->params) | |
243 | return 0; | |
244 | ||
245 | /* flush the DMA channel */ | |
246 | s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_FLUSH); | |
247 | prtd->dma_loaded = 0; | |
248 | prtd->dma_pos = prtd->dma_start; | |
249 | ||
250 | /* enqueue dma buffers */ | |
251 | s3c24xx_pcm_enqueue(substream); | |
252 | ||
253 | return ret; | |
254 | } | |
255 | ||
256 | static 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 | DBG("Entered %s\n", __FUNCTION__); | |
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 | s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STARTED); | |
272 | break; | |
273 | ||
274 | case SNDRV_PCM_TRIGGER_STOP: | |
275 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
276 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
277 | prtd->state &= ~ST_RUNNING; | |
278 | s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STOP); | |
279 | break; | |
280 | ||
281 | default: | |
282 | ret = -EINVAL; | |
283 | break; | |
284 | } | |
285 | ||
286 | spin_unlock(&prtd->lock); | |
287 | ||
288 | return ret; | |
289 | } | |
290 | ||
7f1bc26e GG |
291 | static snd_pcm_uframes_t |
292 | s3c24xx_pcm_pointer(struct snd_pcm_substream *substream) | |
c0f41bb1 BD |
293 | { |
294 | struct snd_pcm_runtime *runtime = substream->runtime; | |
295 | struct s3c24xx_runtime_data *prtd = runtime->private_data; | |
296 | unsigned long res; | |
297 | dma_addr_t src, dst; | |
298 | ||
299 | DBG("Entered %s\n", __FUNCTION__); | |
300 | ||
301 | spin_lock(&prtd->lock); | |
302 | s3c2410_dma_getposition(prtd->params->channel, &src, &dst); | |
303 | ||
304 | if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) | |
305 | res = dst - prtd->dma_start; | |
306 | else | |
307 | res = src - prtd->dma_start; | |
308 | ||
309 | spin_unlock(&prtd->lock); | |
310 | ||
311 | DBG("Pointer %x %x\n",src,dst); | |
312 | ||
313 | /* we seem to be getting the odd error from the pcm library due | |
314 | * to out-of-bounds pointers. this is maybe due to the dma engine | |
315 | * not having loaded the new values for the channel before being | |
316 | * callled... (todo - fix ) | |
317 | */ | |
318 | ||
319 | if (res >= snd_pcm_lib_buffer_bytes(substream)) { | |
320 | if (res == snd_pcm_lib_buffer_bytes(substream)) | |
321 | res = 0; | |
322 | } | |
323 | ||
324 | return bytes_to_frames(substream->runtime, res); | |
325 | } | |
326 | ||
327 | static int s3c24xx_pcm_open(struct snd_pcm_substream *substream) | |
328 | { | |
329 | struct snd_pcm_runtime *runtime = substream->runtime; | |
330 | struct s3c24xx_runtime_data *prtd; | |
331 | ||
c0f41bb1 BD |
332 | DBG("Entered %s\n", __FUNCTION__); |
333 | ||
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 | ||
c72816b7 ZD |
340 | spin_lock_init(&prtd->lock); |
341 | ||
c0f41bb1 BD |
342 | runtime->private_data = prtd; |
343 | return 0; | |
344 | } | |
345 | ||
346 | static 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 | DBG("Entered %s\n", __FUNCTION__); | |
352 | ||
7f1bc26e | 353 | if (prtd) |
c0f41bb1 BD |
354 | kfree(prtd); |
355 | else | |
356 | DBG("s3c24xx_pcm_close called with prtd == NULL\n"); | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
361 | static 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 | DBG("Entered %s\n", __FUNCTION__); | |
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 | ||
374 | static 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 | ||
386 | static 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 | DBG("Entered %s\n", __FUNCTION__); | |
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 | ||
405 | static 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 | DBG("Entered %s\n", __FUNCTION__); | |
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 | ||
428 | static u64 s3c24xx_pcm_dmamask = DMA_32BIT_MASK; | |
429 | ||
7f1bc26e GG |
430 | static int s3c24xx_pcm_new(struct snd_card *card, |
431 | struct snd_soc_codec_dai *dai, struct snd_pcm *pcm) | |
c0f41bb1 BD |
432 | { |
433 | int ret = 0; | |
434 | ||
435 | DBG("Entered %s\n", __FUNCTION__); | |
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 | ||
459 | struct 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 | }; | |
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"); |