Commit | Line | Data |
---|---|---|
2e74796a JN |
1 | /* |
2 | * omap-pcm.c -- ALSA PCM interface for the OMAP SoC | |
3 | * | |
4 | * Copyright (C) 2008 Nokia Corporation | |
5 | * | |
b08f7a62 JN |
6 | * Contact: Jarkko Nikula <jhnikula@gmail.com> |
7 | * Peter Ujfalusi <peter.ujfalusi@nokia.com> | |
2e74796a JN |
8 | * |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * version 2 as published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
21 | * 02110-1301 USA | |
22 | * | |
23 | */ | |
24 | ||
25 | #include <linux/dma-mapping.h> | |
5a0e3ad6 | 26 | #include <linux/slab.h> |
2e74796a JN |
27 | #include <sound/core.h> |
28 | #include <sound/pcm.h> | |
29 | #include <sound/pcm_params.h> | |
30 | #include <sound/soc.h> | |
31 | ||
ce491cf8 | 32 | #include <plat/dma.h> |
2e74796a JN |
33 | #include "omap-pcm.h" |
34 | ||
35 | static const struct snd_pcm_hardware omap_pcm_hardware = { | |
36 | .info = SNDRV_PCM_INFO_MMAP | | |
37 | SNDRV_PCM_INFO_MMAP_VALID | | |
38 | SNDRV_PCM_INFO_INTERLEAVED | | |
39 | SNDRV_PCM_INFO_PAUSE | | |
40 | SNDRV_PCM_INFO_RESUME, | |
e17dd32f MLC |
41 | .formats = SNDRV_PCM_FMTBIT_S16_LE | |
42 | SNDRV_PCM_FMTBIT_S32_LE, | |
2e74796a JN |
43 | .period_bytes_min = 32, |
44 | .period_bytes_max = 64 * 1024, | |
45 | .periods_min = 2, | |
46 | .periods_max = 255, | |
47 | .buffer_bytes_max = 128 * 1024, | |
48 | }; | |
49 | ||
50 | struct omap_runtime_data { | |
51 | spinlock_t lock; | |
52 | struct omap_pcm_dma_data *dma_data; | |
53 | int dma_ch; | |
54 | int period_index; | |
55 | }; | |
56 | ||
57 | static void omap_pcm_dma_irq(int ch, u16 stat, void *data) | |
58 | { | |
59 | struct snd_pcm_substream *substream = data; | |
60 | struct snd_pcm_runtime *runtime = substream->runtime; | |
61 | struct omap_runtime_data *prtd = runtime->private_data; | |
62 | unsigned long flags; | |
63 | ||
b5442a75 | 64 | if ((cpu_is_omap1510())) { |
2e74796a | 65 | /* |
64844a6a JK |
66 | * OMAP1510 doesn't fully support DMA progress counter |
67 | * and there is no software emulation implemented yet, | |
b5442a75 | 68 | * so have to maintain our own progress counters |
64844a6a | 69 | * that can be used by omap_pcm_pointer() instead. |
2e74796a JN |
70 | */ |
71 | spin_lock_irqsave(&prtd->lock, flags); | |
471e3dec JK |
72 | if ((stat == OMAP_DMA_LAST_IRQ) && |
73 | (prtd->period_index == runtime->periods - 1)) { | |
74 | /* we are in sync, do nothing */ | |
75 | spin_unlock_irqrestore(&prtd->lock, flags); | |
76 | return; | |
77 | } | |
2e74796a | 78 | if (prtd->period_index >= 0) { |
471e3dec JK |
79 | if (stat & OMAP_DMA_BLOCK_IRQ) { |
80 | /* end of buffer reached, loop back */ | |
81 | prtd->period_index = 0; | |
82 | } else if (stat & OMAP_DMA_LAST_IRQ) { | |
83 | /* update the counter for the last period */ | |
84 | prtd->period_index = runtime->periods - 1; | |
85 | } else if (++prtd->period_index >= runtime->periods) { | |
86 | /* end of buffer missed? loop back */ | |
2e74796a | 87 | prtd->period_index = 0; |
2e74796a JN |
88 | } |
89 | } | |
90 | spin_unlock_irqrestore(&prtd->lock, flags); | |
91 | } | |
92 | ||
93 | snd_pcm_period_elapsed(substream); | |
94 | } | |
95 | ||
96 | /* this may get called several times by oss emulation */ | |
97 | static int omap_pcm_hw_params(struct snd_pcm_substream *substream, | |
98 | struct snd_pcm_hw_params *params) | |
99 | { | |
100 | struct snd_pcm_runtime *runtime = substream->runtime; | |
101 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
102 | struct omap_runtime_data *prtd = runtime->private_data; | |
5f712b2b | 103 | struct omap_pcm_dma_data *dma_data; |
f0fba2ad | 104 | |
2e74796a JN |
105 | int err = 0; |
106 | ||
f0fba2ad | 107 | dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); |
5f712b2b | 108 | |
1b4246a1 JS |
109 | /* return if this is a bufferless transfer e.g. |
110 | * codec <--> BT codec or GSM modem -- lg FIXME */ | |
2e74796a | 111 | if (!dma_data) |
1b4246a1 | 112 | return 0; |
2e74796a JN |
113 | |
114 | snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); | |
115 | runtime->dma_bytes = params_buffer_bytes(params); | |
116 | ||
117 | if (prtd->dma_data) | |
118 | return 0; | |
119 | prtd->dma_data = dma_data; | |
120 | err = omap_request_dma(dma_data->dma_req, dma_data->name, | |
121 | omap_pcm_dma_irq, substream, &prtd->dma_ch); | |
64844a6a | 122 | if (!err) { |
2e74796a JN |
123 | /* |
124 | * Link channel with itself so DMA doesn't need any | |
125 | * reprogramming while looping the buffer | |
126 | */ | |
127 | omap_dma_link_lch(prtd->dma_ch, prtd->dma_ch); | |
128 | } | |
129 | ||
130 | return err; | |
131 | } | |
132 | ||
133 | static int omap_pcm_hw_free(struct snd_pcm_substream *substream) | |
134 | { | |
135 | struct snd_pcm_runtime *runtime = substream->runtime; | |
136 | struct omap_runtime_data *prtd = runtime->private_data; | |
137 | ||
138 | if (prtd->dma_data == NULL) | |
139 | return 0; | |
140 | ||
64844a6a | 141 | omap_dma_unlink_lch(prtd->dma_ch, prtd->dma_ch); |
2e74796a JN |
142 | omap_free_dma(prtd->dma_ch); |
143 | prtd->dma_data = NULL; | |
144 | ||
145 | snd_pcm_set_runtime_buffer(substream, NULL); | |
146 | ||
147 | return 0; | |
148 | } | |
149 | ||
150 | static int omap_pcm_prepare(struct snd_pcm_substream *substream) | |
151 | { | |
152 | struct snd_pcm_runtime *runtime = substream->runtime; | |
153 | struct omap_runtime_data *prtd = runtime->private_data; | |
154 | struct omap_pcm_dma_data *dma_data = prtd->dma_data; | |
155 | struct omap_dma_channel_params dma_params; | |
e17dd32f | 156 | int bytes; |
2e74796a | 157 | |
1b4246a1 JS |
158 | /* return if this is a bufferless transfer e.g. |
159 | * codec <--> BT codec or GSM modem -- lg FIXME */ | |
160 | if (!prtd->dma_data) | |
161 | return 0; | |
162 | ||
2e74796a | 163 | memset(&dma_params, 0, sizeof(dma_params)); |
e17dd32f | 164 | dma_params.data_type = dma_data->data_type; |
2e74796a | 165 | dma_params.trigger = dma_data->dma_req; |
caebc0cb | 166 | dma_params.sync_mode = dma_data->sync_mode; |
2e74796a JN |
167 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
168 | dma_params.src_amode = OMAP_DMA_AMODE_POST_INC; | |
169 | dma_params.dst_amode = OMAP_DMA_AMODE_CONSTANT; | |
170 | dma_params.src_or_dst_synch = OMAP_DMA_DST_SYNC; | |
171 | dma_params.src_start = runtime->dma_addr; | |
172 | dma_params.dst_start = dma_data->port_addr; | |
9d37484c | 173 | dma_params.dst_port = OMAP_DMA_PORT_MPUI; |
e17dd32f | 174 | dma_params.dst_fi = dma_data->packet_size; |
2e74796a JN |
175 | } else { |
176 | dma_params.src_amode = OMAP_DMA_AMODE_CONSTANT; | |
177 | dma_params.dst_amode = OMAP_DMA_AMODE_POST_INC; | |
178 | dma_params.src_or_dst_synch = OMAP_DMA_SRC_SYNC; | |
179 | dma_params.src_start = dma_data->port_addr; | |
180 | dma_params.dst_start = runtime->dma_addr; | |
9d37484c | 181 | dma_params.src_port = OMAP_DMA_PORT_MPUI; |
e17dd32f | 182 | dma_params.src_fi = dma_data->packet_size; |
2e74796a JN |
183 | } |
184 | /* | |
185 | * Set DMA transfer frame size equal to ALSA period size and frame | |
186 | * count as no. of ALSA periods. Then with DMA frame interrupt enabled, | |
187 | * we can transfer the whole ALSA buffer with single DMA transfer but | |
188 | * still can get an interrupt at each period bounary | |
189 | */ | |
e17dd32f MLC |
190 | bytes = snd_pcm_lib_period_bytes(substream); |
191 | dma_params.elem_count = bytes >> dma_data->data_type; | |
2e74796a JN |
192 | dma_params.frame_count = runtime->periods; |
193 | omap_set_dma_params(prtd->dma_ch, &dma_params); | |
194 | ||
b5442a75 | 195 | if ((cpu_is_omap1510())) |
471e3dec JK |
196 | omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ | |
197 | OMAP_DMA_LAST_IRQ | OMAP_DMA_BLOCK_IRQ); | |
198 | else | |
199 | omap_enable_dma_irq(prtd->dma_ch, OMAP_DMA_FRAME_IRQ); | |
2e74796a | 200 | |
4d187fb8 JK |
201 | if (!(cpu_class_is_omap1())) { |
202 | omap_set_dma_src_burst_mode(prtd->dma_ch, | |
203 | OMAP_DMA_DATA_BURST_16); | |
204 | omap_set_dma_dest_burst_mode(prtd->dma_ch, | |
205 | OMAP_DMA_DATA_BURST_16); | |
206 | } | |
9599d485 | 207 | |
2e74796a JN |
208 | return 0; |
209 | } | |
210 | ||
211 | static int omap_pcm_trigger(struct snd_pcm_substream *substream, int cmd) | |
212 | { | |
213 | struct snd_pcm_runtime *runtime = substream->runtime; | |
214 | struct omap_runtime_data *prtd = runtime->private_data; | |
caebc0cb | 215 | struct omap_pcm_dma_data *dma_data = prtd->dma_data; |
21dff434 | 216 | unsigned long flags; |
2e74796a JN |
217 | int ret = 0; |
218 | ||
21dff434 | 219 | spin_lock_irqsave(&prtd->lock, flags); |
2e74796a JN |
220 | switch (cmd) { |
221 | case SNDRV_PCM_TRIGGER_START: | |
222 | case SNDRV_PCM_TRIGGER_RESUME: | |
223 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
224 | prtd->period_index = 0; | |
caebc0cb EV |
225 | /* Configure McBSP internal buffer usage */ |
226 | if (dma_data->set_threshold) | |
227 | dma_data->set_threshold(substream); | |
228 | ||
2e74796a JN |
229 | omap_start_dma(prtd->dma_ch); |
230 | break; | |
231 | ||
232 | case SNDRV_PCM_TRIGGER_STOP: | |
233 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
234 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
235 | prtd->period_index = -1; | |
236 | omap_stop_dma(prtd->dma_ch); | |
237 | break; | |
238 | default: | |
239 | ret = -EINVAL; | |
240 | } | |
21dff434 | 241 | spin_unlock_irqrestore(&prtd->lock, flags); |
2e74796a JN |
242 | |
243 | return ret; | |
244 | } | |
245 | ||
246 | static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream) | |
247 | { | |
248 | struct snd_pcm_runtime *runtime = substream->runtime; | |
249 | struct omap_runtime_data *prtd = runtime->private_data; | |
250 | dma_addr_t ptr; | |
251 | snd_pcm_uframes_t offset; | |
252 | ||
b5442a75 JK |
253 | if (cpu_is_omap1510()) { |
254 | offset = prtd->period_index * runtime->period_size; | |
255 | } else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { | |
2e74796a | 256 | ptr = omap_get_dma_dst_pos(prtd->dma_ch); |
1bdd7419 | 257 | offset = bytes_to_frames(runtime, ptr - runtime->dma_addr); |
b5442a75 | 258 | } else { |
1bdd7419 JK |
259 | ptr = omap_get_dma_src_pos(prtd->dma_ch); |
260 | offset = bytes_to_frames(runtime, ptr - runtime->dma_addr); | |
b5442a75 | 261 | } |
2e74796a | 262 | |
2e74796a JN |
263 | if (offset >= runtime->buffer_size) |
264 | offset = 0; | |
265 | ||
266 | return offset; | |
267 | } | |
268 | ||
269 | static int omap_pcm_open(struct snd_pcm_substream *substream) | |
270 | { | |
271 | struct snd_pcm_runtime *runtime = substream->runtime; | |
272 | struct omap_runtime_data *prtd; | |
273 | int ret; | |
274 | ||
275 | snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware); | |
276 | ||
277 | /* Ensure that buffer size is a multiple of period size */ | |
278 | ret = snd_pcm_hw_constraint_integer(runtime, | |
279 | SNDRV_PCM_HW_PARAM_PERIODS); | |
280 | if (ret < 0) | |
281 | goto out; | |
282 | ||
19b3f316 | 283 | prtd = kzalloc(sizeof(*prtd), GFP_KERNEL); |
2e74796a JN |
284 | if (prtd == NULL) { |
285 | ret = -ENOMEM; | |
286 | goto out; | |
287 | } | |
288 | spin_lock_init(&prtd->lock); | |
289 | runtime->private_data = prtd; | |
290 | ||
291 | out: | |
292 | return ret; | |
293 | } | |
294 | ||
295 | static int omap_pcm_close(struct snd_pcm_substream *substream) | |
296 | { | |
297 | struct snd_pcm_runtime *runtime = substream->runtime; | |
298 | ||
299 | kfree(runtime->private_data); | |
300 | return 0; | |
301 | } | |
302 | ||
303 | static int omap_pcm_mmap(struct snd_pcm_substream *substream, | |
304 | struct vm_area_struct *vma) | |
305 | { | |
306 | struct snd_pcm_runtime *runtime = substream->runtime; | |
307 | ||
308 | return dma_mmap_writecombine(substream->pcm->card->dev, vma, | |
309 | runtime->dma_area, | |
310 | runtime->dma_addr, | |
311 | runtime->dma_bytes); | |
312 | } | |
313 | ||
b2a19d02 | 314 | static struct snd_pcm_ops omap_pcm_ops = { |
2e74796a JN |
315 | .open = omap_pcm_open, |
316 | .close = omap_pcm_close, | |
317 | .ioctl = snd_pcm_lib_ioctl, | |
318 | .hw_params = omap_pcm_hw_params, | |
319 | .hw_free = omap_pcm_hw_free, | |
320 | .prepare = omap_pcm_prepare, | |
321 | .trigger = omap_pcm_trigger, | |
322 | .pointer = omap_pcm_pointer, | |
323 | .mmap = omap_pcm_mmap, | |
324 | }; | |
325 | ||
a152ff24 | 326 | static u64 omap_pcm_dmamask = DMA_BIT_MASK(64); |
2e74796a JN |
327 | |
328 | static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, | |
329 | int stream) | |
330 | { | |
331 | struct snd_pcm_substream *substream = pcm->streams[stream].substream; | |
332 | struct snd_dma_buffer *buf = &substream->dma_buffer; | |
333 | size_t size = omap_pcm_hardware.buffer_bytes_max; | |
334 | ||
335 | buf->dev.type = SNDRV_DMA_TYPE_DEV; | |
336 | buf->dev.dev = pcm->card->dev; | |
337 | buf->private_data = NULL; | |
338 | buf->area = dma_alloc_writecombine(pcm->card->dev, size, | |
339 | &buf->addr, GFP_KERNEL); | |
340 | if (!buf->area) | |
341 | return -ENOMEM; | |
342 | ||
343 | buf->bytes = size; | |
344 | return 0; | |
345 | } | |
346 | ||
347 | static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm) | |
348 | { | |
349 | struct snd_pcm_substream *substream; | |
350 | struct snd_dma_buffer *buf; | |
351 | int stream; | |
352 | ||
353 | for (stream = 0; stream < 2; stream++) { | |
354 | substream = pcm->streams[stream].substream; | |
355 | if (!substream) | |
356 | continue; | |
357 | ||
358 | buf = &substream->dma_buffer; | |
359 | if (!buf->area) | |
360 | continue; | |
361 | ||
362 | dma_free_writecombine(pcm->card->dev, buf->bytes, | |
363 | buf->area, buf->addr); | |
364 | buf->area = NULL; | |
365 | } | |
366 | } | |
367 | ||
d756b277 | 368 | static int omap_pcm_new(struct snd_card *card, struct snd_soc_dai *dai, |
2e74796a JN |
369 | struct snd_pcm *pcm) |
370 | { | |
371 | int ret = 0; | |
372 | ||
373 | if (!card->dev->dma_mask) | |
374 | card->dev->dma_mask = &omap_pcm_dmamask; | |
375 | if (!card->dev->coherent_dma_mask) | |
a152ff24 | 376 | card->dev->coherent_dma_mask = DMA_BIT_MASK(64); |
2e74796a | 377 | |
f0fba2ad | 378 | if (dai->driver->playback.channels_min) { |
2e74796a JN |
379 | ret = omap_pcm_preallocate_dma_buffer(pcm, |
380 | SNDRV_PCM_STREAM_PLAYBACK); | |
381 | if (ret) | |
382 | goto out; | |
383 | } | |
384 | ||
f0fba2ad | 385 | if (dai->driver->capture.channels_min) { |
2e74796a JN |
386 | ret = omap_pcm_preallocate_dma_buffer(pcm, |
387 | SNDRV_PCM_STREAM_CAPTURE); | |
388 | if (ret) | |
389 | goto out; | |
390 | } | |
391 | ||
392 | out: | |
393 | return ret; | |
394 | } | |
395 | ||
f0fba2ad LG |
396 | static struct snd_soc_platform_driver omap_soc_platform = { |
397 | .ops = &omap_pcm_ops, | |
2e74796a JN |
398 | .pcm_new = omap_pcm_new, |
399 | .pcm_free = omap_pcm_free_dma_buffers, | |
400 | }; | |
2e74796a | 401 | |
f0fba2ad LG |
402 | static __devinit int omap_pcm_probe(struct platform_device *pdev) |
403 | { | |
404 | return snd_soc_register_platform(&pdev->dev, | |
405 | &omap_soc_platform); | |
406 | } | |
407 | ||
408 | static int __devexit omap_pcm_remove(struct platform_device *pdev) | |
409 | { | |
410 | snd_soc_unregister_platform(&pdev->dev); | |
411 | return 0; | |
412 | } | |
413 | ||
414 | static struct platform_driver omap_pcm_driver = { | |
415 | .driver = { | |
416 | .name = "omap-pcm-audio", | |
417 | .owner = THIS_MODULE, | |
418 | }, | |
419 | ||
420 | .probe = omap_pcm_probe, | |
421 | .remove = __devexit_p(omap_pcm_remove), | |
422 | }; | |
423 | ||
424 | static int __init snd_omap_pcm_init(void) | |
958e792c | 425 | { |
f0fba2ad | 426 | return platform_driver_register(&omap_pcm_driver); |
958e792c | 427 | } |
f0fba2ad | 428 | module_init(snd_omap_pcm_init); |
958e792c | 429 | |
f0fba2ad | 430 | static void __exit snd_omap_pcm_exit(void) |
958e792c | 431 | { |
f0fba2ad | 432 | platform_driver_unregister(&omap_pcm_driver); |
958e792c | 433 | } |
f0fba2ad | 434 | module_exit(snd_omap_pcm_exit); |
958e792c | 435 | |
b08f7a62 | 436 | MODULE_AUTHOR("Jarkko Nikula <jhnikula@gmail.com>"); |
2e74796a JN |
437 | MODULE_DESCRIPTION("OMAP PCM DMA module"); |
438 | MODULE_LICENSE("GPL"); |