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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 | * | |
c8efef17 | 7 | * Copyright 2004-2005 Simtec Electronics |
c0f41bb1 BD |
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. | |
c0f41bb1 BD |
15 | */ |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/init.h> | |
5111c075 | 19 | #include <linux/io.h> |
c0f41bb1 BD |
20 | #include <linux/platform_device.h> |
21 | #include <linux/slab.h> | |
22 | #include <linux/dma-mapping.h> | |
23 | ||
c0f41bb1 BD |
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> | |
a09e64fb RK |
30 | #include <mach/hardware.h> |
31 | #include <mach/dma.h> | |
899e6cf5 | 32 | #include <plat/audio.h> |
c0f41bb1 BD |
33 | |
34 | #include "s3c24xx-pcm.h" | |
35 | ||
c0f41bb1 BD |
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 | | |
96d90e19 GG |
40 | SNDRV_PCM_INFO_MMAP_VALID | |
41 | SNDRV_PCM_INFO_PAUSE | | |
42 | SNDRV_PCM_INFO_RESUME, | |
c0f41bb1 BD |
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 | */ | |
2bef9010 | 74 | static void s3c24xx_pcm_enqueue(struct snd_pcm_substream *substream) |
c0f41bb1 BD |
75 | { |
76 | struct s3c24xx_runtime_data *prtd = substream->runtime->private_data; | |
77 | dma_addr_t pos = prtd->dma_pos; | |
78 | int ret; | |
79 | ||
ee7d4767 | 80 | pr_debug("Entered %s\n", __func__); |
c0f41bb1 | 81 | |
2bef9010 | 82 | while (prtd->dma_loaded < prtd->dma_limit) { |
c0f41bb1 BD |
83 | unsigned long len = prtd->dma_period; |
84 | ||
ee7d4767 | 85 | pr_debug("dma_loaded: %d\n", prtd->dma_loaded); |
c0f41bb1 BD |
86 | |
87 | if ((pos + len) > prtd->dma_end) { | |
88 | len = prtd->dma_end - pos; | |
ee7d4767 | 89 | pr_debug(KERN_DEBUG "%s: corrected dma len %ld\n", |
9bf8e7dd | 90 | __func__, len); |
c0f41bb1 BD |
91 | } |
92 | ||
5111c075 | 93 | ret = s3c2410_dma_enqueue(prtd->params->channel, |
7f1bc26e | 94 | substream, pos, len); |
c0f41bb1 BD |
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, | |
7f1bc26e GG |
109 | void *dev_id, int size, |
110 | enum s3c2410_dma_buffresult result) | |
c0f41bb1 BD |
111 | { |
112 | struct snd_pcm_substream *substream = dev_id; | |
7f1bc26e | 113 | struct s3c24xx_runtime_data *prtd; |
c0f41bb1 | 114 | |
ee7d4767 | 115 | pr_debug("Entered %s\n", __func__); |
c0f41bb1 BD |
116 | |
117 | if (result == S3C2410_RES_ABORT || result == S3C2410_RES_ERR) | |
118 | return; | |
119 | ||
7f1bc26e | 120 | prtd = substream->runtime->private_data; |
5111c075 | 121 | |
c0f41bb1 BD |
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--; | |
2bef9010 | 128 | s3c24xx_pcm_enqueue(substream); |
c0f41bb1 BD |
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); | |
5111c075 | 142 | int ret = 0; |
c0f41bb1 | 143 | |
ee7d4767 | 144 | pr_debug("Entered %s\n", __func__); |
c0f41bb1 BD |
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 | ||
646ab160 HW |
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; | |
c0f41bb1 | 156 | |
ee7d4767 | 157 | pr_debug("params %p, client %p, channel %d\n", prtd->params, |
646ab160 | 158 | prtd->params->client, prtd->params->channel); |
c0f41bb1 | 159 | |
646ab160 HW |
160 | ret = s3c2410_dma_request(prtd->params->channel, |
161 | prtd->params->client, NULL); | |
c0f41bb1 | 162 | |
d6426171 | 163 | if (ret < 0) { |
b52a5195 | 164 | printk(KERN_ERR "failed to get dma channel\n"); |
646ab160 HW |
165 | return ret; |
166 | } | |
c0f41bb1 BD |
167 | } |
168 | ||
c0f41bb1 BD |
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 | ||
ee7d4767 | 192 | pr_debug("Entered %s\n", __func__); |
c0f41bb1 BD |
193 | |
194 | /* TODO - do we need to ensure DMA flushed */ | |
195 | snd_pcm_set_runtime_buffer(substream, NULL); | |
196 | ||
7f1bc26e | 197 | if (prtd->params) { |
c0f41bb1 BD |
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 | ||
ee7d4767 | 210 | pr_debug("Entered %s\n", __func__); |
c0f41bb1 BD |
211 | |
212 | /* return if this is a bufferless transfer e.g. | |
213 | * codec <--> BT codec or GSM modem -- lg FIXME */ | |
214 | if (!prtd->params) | |
5111c075 | 215 | return 0; |
c0f41bb1 | 216 | |
96d90e19 GG |
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, S3C2410_DISRCC_INC | | |
222 | S3C2410_DISRCC_APB, prtd->params->dma_addr); | |
223 | ||
224 | s3c2410_dma_config(prtd->params->channel, | |
225 | prtd->params->dma_size, | |
226 | S3C2410_DCON_SYNC_PCLK | | |
227 | S3C2410_DCON_HANDSHAKE); | |
228 | } else { | |
229 | s3c2410_dma_config(prtd->params->channel, | |
230 | prtd->params->dma_size, | |
231 | S3C2410_DCON_HANDSHAKE | | |
232 | S3C2410_DCON_SYNC_PCLK); | |
233 | ||
234 | s3c2410_dma_devconfig(prtd->params->channel, | |
235 | S3C2410_DMASRC_HW, 0x3, | |
236 | prtd->params->dma_addr); | |
237 | } | |
238 | ||
c0f41bb1 BD |
239 | /* flush the DMA channel */ |
240 | s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_FLUSH); | |
241 | prtd->dma_loaded = 0; | |
242 | prtd->dma_pos = prtd->dma_start; | |
243 | ||
244 | /* enqueue dma buffers */ | |
2bef9010 | 245 | s3c24xx_pcm_enqueue(substream); |
c0f41bb1 BD |
246 | |
247 | return ret; | |
248 | } | |
249 | ||
250 | static int s3c24xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
251 | { | |
252 | struct s3c24xx_runtime_data *prtd = substream->runtime->private_data; | |
253 | int ret = 0; | |
254 | ||
ee7d4767 | 255 | pr_debug("Entered %s\n", __func__); |
c0f41bb1 BD |
256 | |
257 | spin_lock(&prtd->lock); | |
258 | ||
259 | switch (cmd) { | |
260 | case SNDRV_PCM_TRIGGER_START: | |
261 | case SNDRV_PCM_TRIGGER_RESUME: | |
262 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
263 | prtd->state |= ST_RUNNING; | |
264 | s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_START); | |
265 | s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STARTED); | |
266 | break; | |
267 | ||
268 | case SNDRV_PCM_TRIGGER_STOP: | |
269 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
270 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
271 | prtd->state &= ~ST_RUNNING; | |
272 | s3c2410_dma_ctrl(prtd->params->channel, S3C2410_DMAOP_STOP); | |
273 | break; | |
274 | ||
275 | default: | |
276 | ret = -EINVAL; | |
277 | break; | |
278 | } | |
279 | ||
280 | spin_unlock(&prtd->lock); | |
281 | ||
282 | return ret; | |
283 | } | |
284 | ||
5111c075 MB |
285 | static snd_pcm_uframes_t |
286 | s3c24xx_pcm_pointer(struct snd_pcm_substream *substream) | |
c0f41bb1 BD |
287 | { |
288 | struct snd_pcm_runtime *runtime = substream->runtime; | |
289 | struct s3c24xx_runtime_data *prtd = runtime->private_data; | |
290 | unsigned long res; | |
291 | dma_addr_t src, dst; | |
292 | ||
ee7d4767 | 293 | pr_debug("Entered %s\n", __func__); |
c0f41bb1 BD |
294 | |
295 | spin_lock(&prtd->lock); | |
296 | s3c2410_dma_getposition(prtd->params->channel, &src, &dst); | |
297 | ||
298 | if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) | |
299 | res = dst - prtd->dma_start; | |
300 | else | |
301 | res = src - prtd->dma_start; | |
302 | ||
303 | spin_unlock(&prtd->lock); | |
304 | ||
ee7d4767 | 305 | pr_debug("Pointer %x %x\n", src, dst); |
c0f41bb1 BD |
306 | |
307 | /* we seem to be getting the odd error from the pcm library due | |
308 | * to out-of-bounds pointers. this is maybe due to the dma engine | |
309 | * not having loaded the new values for the channel before being | |
310 | * callled... (todo - fix ) | |
311 | */ | |
312 | ||
313 | if (res >= snd_pcm_lib_buffer_bytes(substream)) { | |
314 | if (res == snd_pcm_lib_buffer_bytes(substream)) | |
315 | res = 0; | |
316 | } | |
317 | ||
318 | return bytes_to_frames(substream->runtime, res); | |
319 | } | |
320 | ||
321 | static int s3c24xx_pcm_open(struct snd_pcm_substream *substream) | |
322 | { | |
323 | struct snd_pcm_runtime *runtime = substream->runtime; | |
324 | struct s3c24xx_runtime_data *prtd; | |
325 | ||
ee7d4767 | 326 | pr_debug("Entered %s\n", __func__); |
c0f41bb1 BD |
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 | ||
c72816b7 ZD |
334 | spin_lock_init(&prtd->lock); |
335 | ||
c0f41bb1 BD |
336 | runtime->private_data = prtd; |
337 | return 0; | |
338 | } | |
339 | ||
340 | static int s3c24xx_pcm_close(struct snd_pcm_substream *substream) | |
341 | { | |
342 | struct snd_pcm_runtime *runtime = substream->runtime; | |
343 | struct s3c24xx_runtime_data *prtd = runtime->private_data; | |
344 | ||
ee7d4767 | 345 | pr_debug("Entered %s\n", __func__); |
c0f41bb1 | 346 | |
5111c075 | 347 | if (!prtd) |
ee7d4767 | 348 | pr_debug("s3c24xx_pcm_close called with prtd == NULL\n"); |
c0f41bb1 | 349 | |
5111c075 MB |
350 | kfree(prtd); |
351 | ||
c0f41bb1 BD |
352 | return 0; |
353 | } | |
354 | ||
355 | static int s3c24xx_pcm_mmap(struct snd_pcm_substream *substream, | |
356 | struct vm_area_struct *vma) | |
357 | { | |
358 | struct snd_pcm_runtime *runtime = substream->runtime; | |
359 | ||
ee7d4767 | 360 | pr_debug("Entered %s\n", __func__); |
c0f41bb1 BD |
361 | |
362 | return dma_mmap_writecombine(substream->pcm->card->dev, vma, | |
5111c075 MB |
363 | runtime->dma_area, |
364 | runtime->dma_addr, | |
365 | runtime->dma_bytes); | |
c0f41bb1 BD |
366 | } |
367 | ||
368 | static struct snd_pcm_ops s3c24xx_pcm_ops = { | |
369 | .open = s3c24xx_pcm_open, | |
370 | .close = s3c24xx_pcm_close, | |
371 | .ioctl = snd_pcm_lib_ioctl, | |
372 | .hw_params = s3c24xx_pcm_hw_params, | |
373 | .hw_free = s3c24xx_pcm_hw_free, | |
374 | .prepare = s3c24xx_pcm_prepare, | |
375 | .trigger = s3c24xx_pcm_trigger, | |
376 | .pointer = s3c24xx_pcm_pointer, | |
377 | .mmap = s3c24xx_pcm_mmap, | |
378 | }; | |
379 | ||
380 | static int s3c24xx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) | |
381 | { | |
382 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; | |
383 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
384 | size_t size = s3c24xx_pcm_hardware.buffer_bytes_max; | |
385 | ||
ee7d4767 | 386 | pr_debug("Entered %s\n", __func__); |
c0f41bb1 BD |
387 | |
388 | buf->dev.type = SNDRV_DMA_TYPE_DEV; | |
389 | buf->dev.dev = pcm->card->dev; | |
390 | buf->private_data = NULL; | |
391 | buf->area = dma_alloc_writecombine(pcm->card->dev, size, | |
392 | &buf->addr, GFP_KERNEL); | |
393 | if (!buf->area) | |
394 | return -ENOMEM; | |
395 | buf->bytes = size; | |
396 | return 0; | |
397 | } | |
398 | ||
399 | static void s3c24xx_pcm_free_dma_buffers(struct snd_pcm *pcm) | |
400 | { | |
401 | struct snd_pcm_substream *substream; | |
402 | struct snd_dma_buffer *buf; | |
403 | int stream; | |
404 | ||
ee7d4767 | 405 | pr_debug("Entered %s\n", __func__); |
c0f41bb1 BD |
406 | |
407 | for (stream = 0; stream < 2; stream++) { | |
408 | substream = pcm->streams[stream].substream; | |
409 | if (!substream) | |
410 | continue; | |
411 | ||
412 | buf = &substream->dma_buffer; | |
413 | if (!buf->area) | |
414 | continue; | |
415 | ||
416 | dma_free_writecombine(pcm->card->dev, buf->bytes, | |
417 | buf->area, buf->addr); | |
418 | buf->area = NULL; | |
419 | } | |
420 | } | |
421 | ||
422 | static u64 s3c24xx_pcm_dmamask = DMA_32BIT_MASK; | |
423 | ||
5111c075 | 424 | static int s3c24xx_pcm_new(struct snd_card *card, |
1992a6fb | 425 | struct snd_soc_dai *dai, struct snd_pcm *pcm) |
c0f41bb1 BD |
426 | { |
427 | int ret = 0; | |
428 | ||
ee7d4767 | 429 | pr_debug("Entered %s\n", __func__); |
c0f41bb1 BD |
430 | |
431 | if (!card->dev->dma_mask) | |
432 | card->dev->dma_mask = &s3c24xx_pcm_dmamask; | |
433 | if (!card->dev->coherent_dma_mask) | |
434 | card->dev->coherent_dma_mask = 0xffffffff; | |
435 | ||
436 | if (dai->playback.channels_min) { | |
437 | ret = s3c24xx_pcm_preallocate_dma_buffer(pcm, | |
438 | SNDRV_PCM_STREAM_PLAYBACK); | |
439 | if (ret) | |
440 | goto out; | |
441 | } | |
442 | ||
443 | if (dai->capture.channels_min) { | |
444 | ret = s3c24xx_pcm_preallocate_dma_buffer(pcm, | |
445 | SNDRV_PCM_STREAM_CAPTURE); | |
446 | if (ret) | |
447 | goto out; | |
448 | } | |
449 | out: | |
450 | return ret; | |
451 | } | |
452 | ||
453 | struct snd_soc_platform s3c24xx_soc_platform = { | |
454 | .name = "s3c24xx-audio", | |
455 | .pcm_ops = &s3c24xx_pcm_ops, | |
456 | .pcm_new = s3c24xx_pcm_new, | |
457 | .pcm_free = s3c24xx_pcm_free_dma_buffers, | |
458 | }; | |
c0f41bb1 BD |
459 | EXPORT_SYMBOL_GPL(s3c24xx_soc_platform); |
460 | ||
c9b3a40f | 461 | static int __init s3c24xx_soc_platform_init(void) |
958e792c MB |
462 | { |
463 | return snd_soc_register_platform(&s3c24xx_soc_platform); | |
464 | } | |
465 | module_init(s3c24xx_soc_platform_init); | |
466 | ||
467 | static void __exit s3c24xx_soc_platform_exit(void) | |
468 | { | |
469 | snd_soc_unregister_platform(&s3c24xx_soc_platform); | |
470 | } | |
471 | module_exit(s3c24xx_soc_platform_exit); | |
472 | ||
c0f41bb1 BD |
473 | MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>"); |
474 | MODULE_DESCRIPTION("Samsung S3C24XX PCM DMA module"); | |
475 | MODULE_LICENSE("GPL"); |