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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> | |
5111c075 | 23 | #include <linux/io.h> |
c0f41bb1 BD |
24 | #include <linux/platform_device.h> |
25 | #include <linux/slab.h> | |
26 | #include <linux/dma-mapping.h> | |
27 | ||
c0f41bb1 BD |
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> | |
c0f41bb1 BD |
34 | #include <asm/hardware.h> |
35 | #include <asm/arch/dma.h> | |
36 | #include <asm/arch/audio.h> | |
37 | ||
38 | #include "s3c24xx-pcm.h" | |
39 | ||
40 | #define S3C24XX_PCM_DEBUG 0 | |
41 | #if S3C24XX_PCM_DEBUG | |
40920307 | 42 | #define DBG(x...) printk(KERN_DEBUG "s3c24xx-pcm: " x) |
c0f41bb1 BD |
43 | #else |
44 | #define DBG(x...) | |
45 | #endif | |
46 | ||
47 | static const struct snd_pcm_hardware s3c24xx_pcm_hardware = { | |
48 | .info = SNDRV_PCM_INFO_INTERLEAVED | | |
49 | SNDRV_PCM_INFO_BLOCK_TRANSFER | | |
50 | SNDRV_PCM_INFO_MMAP | | |
96d90e19 GG |
51 | SNDRV_PCM_INFO_MMAP_VALID | |
52 | SNDRV_PCM_INFO_PAUSE | | |
53 | SNDRV_PCM_INFO_RESUME, | |
c0f41bb1 BD |
54 | .formats = SNDRV_PCM_FMTBIT_S16_LE | |
55 | SNDRV_PCM_FMTBIT_U16_LE | | |
56 | SNDRV_PCM_FMTBIT_U8 | | |
57 | SNDRV_PCM_FMTBIT_S8, | |
58 | .channels_min = 2, | |
59 | .channels_max = 2, | |
60 | .buffer_bytes_max = 128*1024, | |
61 | .period_bytes_min = PAGE_SIZE, | |
62 | .period_bytes_max = PAGE_SIZE*2, | |
63 | .periods_min = 2, | |
64 | .periods_max = 128, | |
65 | .fifo_size = 32, | |
66 | }; | |
67 | ||
68 | struct s3c24xx_runtime_data { | |
69 | spinlock_t lock; | |
70 | int state; | |
71 | unsigned int dma_loaded; | |
72 | unsigned int dma_limit; | |
73 | unsigned int dma_period; | |
74 | dma_addr_t dma_start; | |
75 | dma_addr_t dma_pos; | |
76 | dma_addr_t dma_end; | |
77 | struct s3c24xx_pcm_dma_params *params; | |
78 | }; | |
79 | ||
80 | /* s3c24xx_pcm_enqueue | |
81 | * | |
82 | * place a dma buffer onto the queue for the dma system | |
83 | * to handle. | |
84 | */ | |
85 | static void s3c24xx_pcm_enqueue(struct snd_pcm_substream *substream) | |
86 | { | |
87 | struct s3c24xx_runtime_data *prtd = substream->runtime->private_data; | |
88 | dma_addr_t pos = prtd->dma_pos; | |
89 | int ret; | |
90 | ||
9bf8e7dd | 91 | DBG("Entered %s\n", __func__); |
c0f41bb1 | 92 | |
7f1bc26e | 93 | while (prtd->dma_loaded < prtd->dma_limit) { |
c0f41bb1 BD |
94 | unsigned long len = prtd->dma_period; |
95 | ||
5111c075 | 96 | DBG("dma_loaded: %d\n", prtd->dma_loaded); |
c0f41bb1 BD |
97 | |
98 | if ((pos + len) > prtd->dma_end) { | |
99 | len = prtd->dma_end - pos; | |
100 | DBG(KERN_DEBUG "%s: corrected dma len %ld\n", | |
9bf8e7dd | 101 | __func__, len); |
c0f41bb1 BD |
102 | } |
103 | ||
5111c075 | 104 | ret = s3c2410_dma_enqueue(prtd->params->channel, |
7f1bc26e | 105 | substream, pos, len); |
c0f41bb1 BD |
106 | |
107 | if (ret == 0) { | |
108 | prtd->dma_loaded++; | |
109 | pos += prtd->dma_period; | |
110 | if (pos >= prtd->dma_end) | |
111 | pos = prtd->dma_start; | |
112 | } else | |
113 | break; | |
114 | } | |
115 | ||
116 | prtd->dma_pos = pos; | |
117 | } | |
118 | ||
119 | static void s3c24xx_audio_buffdone(struct s3c2410_dma_chan *channel, | |
7f1bc26e GG |
120 | void *dev_id, int size, |
121 | enum s3c2410_dma_buffresult result) | |
c0f41bb1 BD |
122 | { |
123 | struct snd_pcm_substream *substream = dev_id; | |
7f1bc26e | 124 | struct s3c24xx_runtime_data *prtd; |
c0f41bb1 | 125 | |
9bf8e7dd | 126 | DBG("Entered %s\n", __func__); |
c0f41bb1 BD |
127 | |
128 | if (result == S3C2410_RES_ABORT || result == S3C2410_RES_ERR) | |
129 | return; | |
130 | ||
7f1bc26e | 131 | prtd = substream->runtime->private_data; |
5111c075 | 132 | |
c0f41bb1 BD |
133 | if (substream) |
134 | snd_pcm_period_elapsed(substream); | |
135 | ||
136 | spin_lock(&prtd->lock); | |
137 | if (prtd->state & ST_RUNNING) { | |
138 | prtd->dma_loaded--; | |
139 | s3c24xx_pcm_enqueue(substream); | |
140 | } | |
141 | ||
142 | spin_unlock(&prtd->lock); | |
143 | } | |
144 | ||
145 | static int s3c24xx_pcm_hw_params(struct snd_pcm_substream *substream, | |
146 | struct snd_pcm_hw_params *params) | |
147 | { | |
148 | struct snd_pcm_runtime *runtime = substream->runtime; | |
149 | struct s3c24xx_runtime_data *prtd = runtime->private_data; | |
150 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
151 | struct s3c24xx_pcm_dma_params *dma = rtd->dai->cpu_dai->dma_data; | |
152 | unsigned long totbytes = params_buffer_bytes(params); | |
5111c075 | 153 | int ret = 0; |
c0f41bb1 | 154 | |
9bf8e7dd | 155 | DBG("Entered %s\n", __func__); |
c0f41bb1 BD |
156 | |
157 | /* return if this is a bufferless transfer e.g. | |
158 | * codec <--> BT codec or GSM modem -- lg FIXME */ | |
159 | if (!dma) | |
160 | return 0; | |
161 | ||
646ab160 HW |
162 | /* this may get called several times by oss emulation |
163 | * with different params -HW */ | |
164 | if (prtd->params == NULL) { | |
165 | /* prepare DMA */ | |
166 | prtd->params = dma; | |
c0f41bb1 | 167 | |
646ab160 HW |
168 | DBG("params %p, client %p, channel %d\n", prtd->params, |
169 | prtd->params->client, prtd->params->channel); | |
c0f41bb1 | 170 | |
646ab160 HW |
171 | ret = s3c2410_dma_request(prtd->params->channel, |
172 | prtd->params->client, NULL); | |
c0f41bb1 | 173 | |
646ab160 HW |
174 | if (ret) { |
175 | DBG(KERN_ERR "failed to get dma channel\n"); | |
176 | return ret; | |
177 | } | |
c0f41bb1 BD |
178 | } |
179 | ||
c0f41bb1 BD |
180 | s3c2410_dma_set_buffdone_fn(prtd->params->channel, |
181 | s3c24xx_audio_buffdone); | |
182 | ||
183 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); | |
184 | ||
185 | runtime->dma_bytes = totbytes; | |
186 | ||
187 | spin_lock_irq(&prtd->lock); | |
188 | prtd->dma_loaded = 0; | |
189 | prtd->dma_limit = runtime->hw.periods_min; | |
190 | prtd->dma_period = params_period_bytes(params); | |
191 | prtd->dma_start = runtime->dma_addr; | |
192 | prtd->dma_pos = prtd->dma_start; | |
193 | prtd->dma_end = prtd->dma_start + totbytes; | |
194 | spin_unlock_irq(&prtd->lock); | |
195 | ||
196 | return 0; | |
197 | } | |
198 | ||
199 | static int s3c24xx_pcm_hw_free(struct snd_pcm_substream *substream) | |
200 | { | |
201 | struct s3c24xx_runtime_data *prtd = substream->runtime->private_data; | |
202 | ||
9bf8e7dd | 203 | DBG("Entered %s\n", __func__); |
c0f41bb1 BD |
204 | |
205 | /* TODO - do we need to ensure DMA flushed */ | |
206 | snd_pcm_set_runtime_buffer(substream, NULL); | |
207 | ||
7f1bc26e | 208 | if (prtd->params) { |
c0f41bb1 BD |
209 | s3c2410_dma_free(prtd->params->channel, prtd->params->client); |
210 | prtd->params = NULL; | |
211 | } | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
216 | static int s3c24xx_pcm_prepare(struct snd_pcm_substream *substream) | |
217 | { | |
218 | struct s3c24xx_runtime_data *prtd = substream->runtime->private_data; | |
219 | int ret = 0; | |
220 | ||
9bf8e7dd | 221 | DBG("Entered %s\n", __func__); |
c0f41bb1 BD |
222 | |
223 | /* return if this is a bufferless transfer e.g. | |
224 | * codec <--> BT codec or GSM modem -- lg FIXME */ | |
225 | if (!prtd->params) | |
5111c075 | 226 | return 0; |
c0f41bb1 | 227 | |
96d90e19 GG |
228 | /* channel needs configuring for mem=>device, increment memory addr, |
229 | * sync to pclk, half-word transfers to the IIS-FIFO. */ | |
230 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { | |
231 | s3c2410_dma_devconfig(prtd->params->channel, | |
232 | S3C2410_DMASRC_MEM, S3C2410_DISRCC_INC | | |
233 | S3C2410_DISRCC_APB, prtd->params->dma_addr); | |
234 | ||
235 | s3c2410_dma_config(prtd->params->channel, | |
236 | prtd->params->dma_size, | |
237 | S3C2410_DCON_SYNC_PCLK | | |
238 | S3C2410_DCON_HANDSHAKE); | |
239 | } else { | |
240 | s3c2410_dma_config(prtd->params->channel, | |
241 | prtd->params->dma_size, | |
242 | S3C2410_DCON_HANDSHAKE | | |
243 | S3C2410_DCON_SYNC_PCLK); | |
244 | ||
245 | s3c2410_dma_devconfig(prtd->params->channel, | |
246 | S3C2410_DMASRC_HW, 0x3, | |
247 | prtd->params->dma_addr); | |
248 | } | |
249 | ||
c0f41bb1 BD |
250 | /* flush the DMA channel */ |
251 | s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_FLUSH); | |
252 | prtd->dma_loaded = 0; | |
253 | prtd->dma_pos = prtd->dma_start; | |
254 | ||
255 | /* enqueue dma buffers */ | |
256 | s3c24xx_pcm_enqueue(substream); | |
257 | ||
258 | return ret; | |
259 | } | |
260 | ||
261 | static int s3c24xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
262 | { | |
263 | struct s3c24xx_runtime_data *prtd = substream->runtime->private_data; | |
264 | int ret = 0; | |
265 | ||
9bf8e7dd | 266 | DBG("Entered %s\n", __func__); |
c0f41bb1 BD |
267 | |
268 | spin_lock(&prtd->lock); | |
269 | ||
270 | switch (cmd) { | |
271 | case SNDRV_PCM_TRIGGER_START: | |
272 | case SNDRV_PCM_TRIGGER_RESUME: | |
273 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
274 | prtd->state |= ST_RUNNING; | |
275 | s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_START); | |
276 | s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STARTED); | |
277 | break; | |
278 | ||
279 | case SNDRV_PCM_TRIGGER_STOP: | |
280 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
281 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
282 | prtd->state &= ~ST_RUNNING; | |
283 | s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STOP); | |
284 | break; | |
285 | ||
286 | default: | |
287 | ret = -EINVAL; | |
288 | break; | |
289 | } | |
290 | ||
291 | spin_unlock(&prtd->lock); | |
292 | ||
293 | return ret; | |
294 | } | |
295 | ||
5111c075 MB |
296 | static snd_pcm_uframes_t |
297 | s3c24xx_pcm_pointer(struct snd_pcm_substream *substream) | |
c0f41bb1 BD |
298 | { |
299 | struct snd_pcm_runtime *runtime = substream->runtime; | |
300 | struct s3c24xx_runtime_data *prtd = runtime->private_data; | |
301 | unsigned long res; | |
302 | dma_addr_t src, dst; | |
303 | ||
9bf8e7dd | 304 | DBG("Entered %s\n", __func__); |
c0f41bb1 BD |
305 | |
306 | spin_lock(&prtd->lock); | |
307 | s3c2410_dma_getposition(prtd->params->channel, &src, &dst); | |
308 | ||
309 | if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) | |
310 | res = dst - prtd->dma_start; | |
311 | else | |
312 | res = src - prtd->dma_start; | |
313 | ||
314 | spin_unlock(&prtd->lock); | |
315 | ||
5111c075 | 316 | DBG("Pointer %x %x\n", src, dst); |
c0f41bb1 BD |
317 | |
318 | /* we seem to be getting the odd error from the pcm library due | |
319 | * to out-of-bounds pointers. this is maybe due to the dma engine | |
320 | * not having loaded the new values for the channel before being | |
321 | * callled... (todo - fix ) | |
322 | */ | |
323 | ||
324 | if (res >= snd_pcm_lib_buffer_bytes(substream)) { | |
325 | if (res == snd_pcm_lib_buffer_bytes(substream)) | |
326 | res = 0; | |
327 | } | |
328 | ||
329 | return bytes_to_frames(substream->runtime, res); | |
330 | } | |
331 | ||
332 | static int s3c24xx_pcm_open(struct snd_pcm_substream *substream) | |
333 | { | |
334 | struct snd_pcm_runtime *runtime = substream->runtime; | |
335 | struct s3c24xx_runtime_data *prtd; | |
336 | ||
9bf8e7dd | 337 | DBG("Entered %s\n", __func__); |
c0f41bb1 BD |
338 | |
339 | snd_soc_set_runtime_hwparams(substream, &s3c24xx_pcm_hardware); | |
340 | ||
341 | prtd = kzalloc(sizeof(struct s3c24xx_runtime_data), GFP_KERNEL); | |
342 | if (prtd == NULL) | |
343 | return -ENOMEM; | |
344 | ||
c72816b7 ZD |
345 | spin_lock_init(&prtd->lock); |
346 | ||
c0f41bb1 BD |
347 | runtime->private_data = prtd; |
348 | return 0; | |
349 | } | |
350 | ||
351 | static int s3c24xx_pcm_close(struct snd_pcm_substream *substream) | |
352 | { | |
353 | struct snd_pcm_runtime *runtime = substream->runtime; | |
354 | struct s3c24xx_runtime_data *prtd = runtime->private_data; | |
355 | ||
9bf8e7dd | 356 | DBG("Entered %s\n", __func__); |
c0f41bb1 | 357 | |
5111c075 | 358 | if (!prtd) |
c0f41bb1 BD |
359 | DBG("s3c24xx_pcm_close called with prtd == NULL\n"); |
360 | ||
5111c075 MB |
361 | kfree(prtd); |
362 | ||
c0f41bb1 BD |
363 | return 0; |
364 | } | |
365 | ||
366 | static int s3c24xx_pcm_mmap(struct snd_pcm_substream *substream, | |
367 | struct vm_area_struct *vma) | |
368 | { | |
369 | struct snd_pcm_runtime *runtime = substream->runtime; | |
370 | ||
9bf8e7dd | 371 | DBG("Entered %s\n", __func__); |
c0f41bb1 BD |
372 | |
373 | return dma_mmap_writecombine(substream->pcm->card->dev, vma, | |
5111c075 MB |
374 | runtime->dma_area, |
375 | runtime->dma_addr, | |
376 | runtime->dma_bytes); | |
c0f41bb1 BD |
377 | } |
378 | ||
379 | static struct snd_pcm_ops s3c24xx_pcm_ops = { | |
380 | .open = s3c24xx_pcm_open, | |
381 | .close = s3c24xx_pcm_close, | |
382 | .ioctl = snd_pcm_lib_ioctl, | |
383 | .hw_params = s3c24xx_pcm_hw_params, | |
384 | .hw_free = s3c24xx_pcm_hw_free, | |
385 | .prepare = s3c24xx_pcm_prepare, | |
386 | .trigger = s3c24xx_pcm_trigger, | |
387 | .pointer = s3c24xx_pcm_pointer, | |
388 | .mmap = s3c24xx_pcm_mmap, | |
389 | }; | |
390 | ||
391 | static int s3c24xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) | |
392 | { | |
393 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; | |
394 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
395 | size_t size = s3c24xx_pcm_hardware.buffer_bytes_max; | |
396 | ||
9bf8e7dd | 397 | DBG("Entered %s\n", __func__); |
c0f41bb1 BD |
398 | |
399 | buf->dev.type = SNDRV_DMA_TYPE_DEV; | |
400 | buf->dev.dev = pcm->card->dev; | |
401 | buf->private_data = NULL; | |
402 | buf->area = dma_alloc_writecombine(pcm->card->dev, size, | |
403 | &buf->addr, GFP_KERNEL); | |
404 | if (!buf->area) | |
405 | return -ENOMEM; | |
406 | buf->bytes = size; | |
407 | return 0; | |
408 | } | |
409 | ||
410 | static void s3c24xx_pcm_free_dma_buffers(struct snd_pcm *pcm) | |
411 | { | |
412 | struct snd_pcm_substream *substream; | |
413 | struct snd_dma_buffer *buf; | |
414 | int stream; | |
415 | ||
9bf8e7dd | 416 | DBG("Entered %s\n", __func__); |
c0f41bb1 BD |
417 | |
418 | for (stream = 0; stream < 2; stream++) { | |
419 | substream = pcm->streams[stream].substream; | |
420 | if (!substream) | |
421 | continue; | |
422 | ||
423 | buf = &substream->dma_buffer; | |
424 | if (!buf->area) | |
425 | continue; | |
426 | ||
427 | dma_free_writecombine(pcm->card->dev, buf->bytes, | |
428 | buf->area, buf->addr); | |
429 | buf->area = NULL; | |
430 | } | |
431 | } | |
432 | ||
433 | static u64 s3c24xx_pcm_dmamask = DMA_32BIT_MASK; | |
434 | ||
5111c075 | 435 | static int s3c24xx_pcm_new(struct snd_card *card, |
7f1bc26e | 436 | struct snd_soc_codec_dai *dai, struct snd_pcm *pcm) |
c0f41bb1 BD |
437 | { |
438 | int ret = 0; | |
439 | ||
9bf8e7dd | 440 | DBG("Entered %s\n", __func__); |
c0f41bb1 BD |
441 | |
442 | if (!card->dev->dma_mask) | |
443 | card->dev->dma_mask = &s3c24xx_pcm_dmamask; | |
444 | if (!card->dev->coherent_dma_mask) | |
445 | card->dev->coherent_dma_mask = 0xffffffff; | |
446 | ||
447 | if (dai->playback.channels_min) { | |
448 | ret = s3c24xx_pcm_preallocate_dma_buffer(pcm, | |
449 | SNDRV_PCM_STREAM_PLAYBACK); | |
450 | if (ret) | |
451 | goto out; | |
452 | } | |
453 | ||
454 | if (dai->capture.channels_min) { | |
455 | ret = s3c24xx_pcm_preallocate_dma_buffer(pcm, | |
456 | SNDRV_PCM_STREAM_CAPTURE); | |
457 | if (ret) | |
458 | goto out; | |
459 | } | |
460 | out: | |
461 | return ret; | |
462 | } | |
463 | ||
464 | struct snd_soc_platform s3c24xx_soc_platform = { | |
465 | .name = "s3c24xx-audio", | |
466 | .pcm_ops = &s3c24xx_pcm_ops, | |
467 | .pcm_new = s3c24xx_pcm_new, | |
468 | .pcm_free = s3c24xx_pcm_free_dma_buffers, | |
469 | }; | |
c0f41bb1 BD |
470 | EXPORT_SYMBOL_GPL(s3c24xx_soc_platform); |
471 | ||
472 | MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>"); | |
473 | MODULE_DESCRIPTION("Samsung S3C24XX PCM DMA module"); | |
474 | MODULE_LICENSE("GPL"); |