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1 | /* |
2 | * Copyright (C) 2013, Analog Devices Inc. |
3 | * Author: Lars-Peter Clausen <lars@metafoo.de> |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify it |
6 | * under the terms of the GNU General Public License as published by the |
7 | * Free Software Foundation; either version 2 of the License, or (at your |
8 | * option) any later version. |
9 | * |
10 | * You should have received a copy of the GNU General Public License along |
11 | * with this program; if not, write to the Free Software Foundation, Inc., |
12 | * 675 Mass Ave, Cambridge, MA 02139, USA. |
13 | * |
14 | */ |
15 | #include <linux/module.h> |
16 | #include <linux/init.h> |
17 | #include <linux/dmaengine.h> |
18 | #include <linux/slab.h> |
19 | #include <sound/pcm.h> |
20 | #include <sound/pcm_params.h> |
21 | #include <sound/soc.h> |
22 | #include <linux/dma-mapping.h> |
23 | #include <linux/of.h> |
24 | |
25 | #include <sound/dmaengine_pcm.h> |
26 | |
27 | struct dmaengine_pcm { |
28 | struct dma_chan *chan[SNDRV_PCM_STREAM_LAST + 1]; |
29 | const struct snd_dmaengine_pcm_config *config; |
30 | struct snd_soc_platform platform; |
31 | unsigned int flags; |
32 | }; |
33 | |
34 | static struct dmaengine_pcm *soc_platform_to_pcm(struct snd_soc_platform *p) |
35 | { |
36 | return container_of(p, struct dmaengine_pcm, platform); |
37 | } |
38 | |
39 | static struct device *dmaengine_dma_dev(struct dmaengine_pcm *pcm, |
40 | struct snd_pcm_substream *substream) |
41 | { |
42 | if (!pcm->chan[substream->stream]) |
43 | return NULL; |
44 | |
45 | return pcm->chan[substream->stream]->device->dev; |
46 | } |
47 | |
48 | /** |
49 | * snd_dmaengine_pcm_prepare_slave_config() - Generic prepare_slave_config callback |
50 | * @substream: PCM substream |
51 | * @params: hw_params |
52 | * @slave_config: DMA slave config to prepare |
53 | * |
54 | * This function can be used as a generic prepare_slave_config callback for |
55 | * platforms which make use of the snd_dmaengine_dai_dma_data struct for their |
56 | * DAI DMA data. Internally the function will first call |
57 | * snd_hwparams_to_dma_slave_config to fill in the slave config based on the |
58 | * hw_params, followed by snd_dmaengine_set_config_from_dai_data to fill in the |
59 | * remaining fields based on the DAI DMA data. |
60 | */ |
61 | int snd_dmaengine_pcm_prepare_slave_config(struct snd_pcm_substream *substream, |
62 | struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config) |
63 | { |
64 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
65 | struct snd_dmaengine_dai_dma_data *dma_data; |
66 | int ret; |
67 | |
68 | dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); |
69 | |
70 | ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config); |
71 | if (ret) |
72 | return ret; |
73 | |
74 | snd_dmaengine_pcm_set_config_from_dai_data(substream, dma_data, |
75 | slave_config); |
76 | |
77 | return 0; |
78 | } |
79 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_prepare_slave_config); |
80 | |
81 | static int dmaengine_pcm_hw_params(struct snd_pcm_substream *substream, |
82 | struct snd_pcm_hw_params *params) |
83 | { |
84 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
85 | struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform); |
86 | struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream); |
87 | int (*prepare_slave_config)(struct snd_pcm_substream *substream, |
88 | struct snd_pcm_hw_params *params, |
89 | struct dma_slave_config *slave_config); |
90 | struct dma_slave_config slave_config; |
91 | int ret; |
92 | |
93 | memset(&slave_config, 0, sizeof(slave_config)); |
94 | |
95 | if (!pcm->config) |
96 | prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config; |
97 | else |
98 | prepare_slave_config = pcm->config->prepare_slave_config; |
99 | |
100 | if (prepare_slave_config) { |
101 | ret = prepare_slave_config(substream, params, &slave_config); |
102 | if (ret) |
103 | return ret; |
104 | |
105 | ret = dmaengine_slave_config(chan, &slave_config); |
106 | if (ret) |
107 | return ret; |
108 | } |
109 | |
110 | return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params)); |
111 | } |
112 | |
113 | static int dmaengine_pcm_set_runtime_hwparams(struct snd_pcm_substream *substream) |
114 | { |
115 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
116 | struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform); |
117 | struct device *dma_dev = dmaengine_dma_dev(pcm, substream); |
118 | struct dma_chan *chan = pcm->chan[substream->stream]; |
119 | struct snd_dmaengine_dai_dma_data *dma_data; |
120 | struct dma_slave_caps dma_caps; |
121 | struct snd_pcm_hardware hw; |
122 | int ret; |
123 | |
124 | if (pcm->config && pcm->config->pcm_hardware) |
125 | return snd_soc_set_runtime_hwparams(substream, |
126 | pcm->config->pcm_hardware); |
127 | |
128 | dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); |
129 | |
130 | memset(&hw, 0, sizeof(hw)); |
131 | hw.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | |
132 | SNDRV_PCM_INFO_INTERLEAVED; |
133 | hw.periods_min = 2; |
134 | hw.periods_max = UINT_MAX; |
135 | hw.period_bytes_min = 256; |
136 | hw.period_bytes_max = dma_get_max_seg_size(dma_dev); |
137 | hw.buffer_bytes_max = SIZE_MAX; |
138 | hw.fifo_size = dma_data->fifo_size; |
139 | |
140 | ret = dma_get_slave_caps(chan, &dma_caps); |
141 | if (ret == 0) { |
142 | if (dma_caps.cmd_pause) |
143 | hw.info |= SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME; |
144 | } |
145 | |
146 | return snd_soc_set_runtime_hwparams(substream, &hw); |
147 | } |
148 | |
149 | static int dmaengine_pcm_open(struct snd_pcm_substream *substream) |
150 | { |
151 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
152 | struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform); |
153 | struct dma_chan *chan = pcm->chan[substream->stream]; |
154 | int ret; |
155 | |
156 | ret = dmaengine_pcm_set_runtime_hwparams(substream); |
157 | if (ret) |
158 | return ret; |
159 | |
160 | return snd_dmaengine_pcm_open(substream, chan); |
161 | } |
162 | |
163 | static void dmaengine_pcm_free(struct snd_pcm *pcm) |
164 | { |
165 | snd_pcm_lib_preallocate_free_for_all(pcm); |
166 | } |
167 | |
168 | static struct dma_chan *dmaengine_pcm_compat_request_channel( |
169 | struct snd_soc_pcm_runtime *rtd, |
170 | struct snd_pcm_substream *substream) |
171 | { |
172 | struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform); |
173 | struct snd_dmaengine_dai_dma_data *dma_data; |
174 | |
175 | dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); |
176 | |
177 | if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) && pcm->chan[0]) |
178 | return pcm->chan[0]; |
179 | |
180 | if (pcm->config->compat_request_channel) |
181 | return pcm->config->compat_request_channel(rtd, substream); |
182 | |
183 | return snd_dmaengine_pcm_request_channel(pcm->config->compat_filter_fn, |
184 | dma_data->filter_data); |
185 | } |
186 | |
187 | static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd) |
188 | { |
189 | struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform); |
190 | const struct snd_dmaengine_pcm_config *config = pcm->config; |
191 | struct device *dev = rtd->platform->dev; |
192 | struct snd_dmaengine_dai_dma_data *dma_data; |
193 | struct snd_pcm_substream *substream; |
194 | size_t prealloc_buffer_size; |
195 | size_t max_buffer_size; |
196 | unsigned int i; |
197 | int ret; |
198 | |
199 | if (config && config->prealloc_buffer_size) { |
200 | prealloc_buffer_size = config->prealloc_buffer_size; |
201 | max_buffer_size = config->pcm_hardware->buffer_bytes_max; |
202 | } else { |
203 | prealloc_buffer_size = 512 * 1024; |
204 | max_buffer_size = SIZE_MAX; |
205 | } |
206 | |
207 | |
208 | for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) { |
209 | substream = rtd->pcm->streams[i].substream; |
210 | if (!substream) |
211 | continue; |
212 | |
213 | dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); |
214 | |
215 | if (!pcm->chan[i] && |
216 | (pcm->flags & SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME)) |
217 | pcm->chan[i] = dma_request_slave_channel(dev, |
218 | dma_data->chan_name); |
219 | |
220 | if (!pcm->chan[i] && (pcm->flags & SND_DMAENGINE_PCM_FLAG_COMPAT)) { |
221 | pcm->chan[i] = dmaengine_pcm_compat_request_channel(rtd, |
222 | substream); |
223 | } |
224 | |
225 | if (!pcm->chan[i]) { |
226 | dev_err(rtd->platform->dev, |
227 | "Missing dma channel for stream: %d\n", i); |
228 | ret = -EINVAL; |
229 | goto err_free; |
230 | } |
231 | |
232 | ret = snd_pcm_lib_preallocate_pages(substream, |
233 | SNDRV_DMA_TYPE_DEV_IRAM, |
234 | dmaengine_dma_dev(pcm, substream), |
235 | prealloc_buffer_size, |
236 | max_buffer_size); |
237 | if (ret) |
238 | goto err_free; |
239 | } |
240 | |
241 | return 0; |
242 | |
243 | err_free: |
244 | dmaengine_pcm_free(rtd->pcm); |
245 | return ret; |
246 | } |
247 | |
248 | static const struct snd_pcm_ops dmaengine_pcm_ops = { |
249 | .open = dmaengine_pcm_open, |
250 | .close = snd_dmaengine_pcm_close, |
251 | .ioctl = snd_pcm_lib_ioctl, |
252 | .hw_params = dmaengine_pcm_hw_params, |
253 | .hw_free = snd_pcm_lib_free_pages, |
254 | .trigger = snd_dmaengine_pcm_trigger, |
255 | .pointer = snd_dmaengine_pcm_pointer, |
256 | }; |
257 | |
258 | static const struct snd_soc_platform_driver dmaengine_pcm_platform = { |
259 | .ops = &dmaengine_pcm_ops, |
260 | .pcm_new = dmaengine_pcm_new, |
261 | .pcm_free = dmaengine_pcm_free, |
262 | .probe_order = SND_SOC_COMP_ORDER_LATE, |
263 | }; |
264 | |
265 | static const struct snd_pcm_ops dmaengine_no_residue_pcm_ops = { |
266 | .open = dmaengine_pcm_open, |
267 | .close = snd_dmaengine_pcm_close, |
268 | .ioctl = snd_pcm_lib_ioctl, |
269 | .hw_params = dmaengine_pcm_hw_params, |
270 | .hw_free = snd_pcm_lib_free_pages, |
271 | .trigger = snd_dmaengine_pcm_trigger, |
272 | .pointer = snd_dmaengine_pcm_pointer_no_residue, |
273 | }; |
274 | |
275 | static const struct snd_soc_platform_driver dmaengine_no_residue_pcm_platform = { |
276 | .ops = &dmaengine_no_residue_pcm_ops, |
277 | .pcm_new = dmaengine_pcm_new, |
278 | .pcm_free = dmaengine_pcm_free, |
279 | .probe_order = SND_SOC_COMP_ORDER_LATE, |
280 | }; |
281 | |
282 | static const char * const dmaengine_pcm_dma_channel_names[] = { |
283 | [SNDRV_PCM_STREAM_PLAYBACK] = "tx", |
284 | [SNDRV_PCM_STREAM_CAPTURE] = "rx", |
285 | }; |
286 | |
287 | static void dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm, |
288 | struct device *dev) |
289 | { |
290 | unsigned int i; |
291 | |
292 | if ((pcm->flags & (SND_DMAENGINE_PCM_FLAG_NO_DT | |
293 | SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME)) || |
294 | !dev->of_node) |
295 | return; |
296 | |
297 | if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) { |
298 | pcm->chan[0] = dma_request_slave_channel(dev, "rx-tx"); |
299 | pcm->chan[1] = pcm->chan[0]; |
300 | } else { |
301 | for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) { |
302 | pcm->chan[i] = dma_request_slave_channel(dev, |
303 | dmaengine_pcm_dma_channel_names[i]); |
304 | } |
305 | } |
306 | } |
307 | |
308 | static void dmaengine_pcm_release_chan(struct dmaengine_pcm *pcm) |
309 | { |
310 | unsigned int i; |
311 | |
312 | for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; |
313 | i++) { |
314 | if (!pcm->chan[i]) |
315 | continue; |
316 | dma_release_channel(pcm->chan[i]); |
317 | if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) |
318 | break; |
319 | } |
320 | } |
321 | |
322 | /** |
323 | * snd_dmaengine_pcm_register - Register a dmaengine based PCM device |
324 | * @dev: The parent device for the PCM device |
325 | * @config: Platform specific PCM configuration |
326 | * @flags: Platform specific quirks |
327 | */ |
328 | int snd_dmaengine_pcm_register(struct device *dev, |
329 | const struct snd_dmaengine_pcm_config *config, unsigned int flags) |
330 | { |
331 | struct dmaengine_pcm *pcm; |
332 | int ret; |
333 | |
334 | pcm = kzalloc(sizeof(*pcm), GFP_KERNEL); |
335 | if (!pcm) |
336 | return -ENOMEM; |
337 | |
338 | pcm->config = config; |
339 | pcm->flags = flags; |
340 | |
341 | dmaengine_pcm_request_chan_of(pcm, dev); |
342 | |
343 | if (flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE) |
344 | ret = snd_soc_add_platform(dev, &pcm->platform, |
345 | &dmaengine_no_residue_pcm_platform); |
346 | else |
347 | ret = snd_soc_add_platform(dev, &pcm->platform, |
348 | &dmaengine_pcm_platform); |
349 | if (ret) |
350 | goto err_free_dma; |
351 | |
352 | return 0; |
353 | |
354 | err_free_dma: |
355 | dmaengine_pcm_release_chan(pcm); |
356 | kfree(pcm); |
357 | return ret; |
358 | } |
359 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_register); |
360 | |
361 | /** |
362 | * snd_dmaengine_pcm_unregister - Removes a dmaengine based PCM device |
363 | * @dev: Parent device the PCM was register with |
364 | * |
365 | * Removes a dmaengine based PCM device previously registered with |
366 | * snd_dmaengine_pcm_register. |
367 | */ |
368 | void snd_dmaengine_pcm_unregister(struct device *dev) |
369 | { |
370 | struct snd_soc_platform *platform; |
371 | struct dmaengine_pcm *pcm; |
372 | |
373 | platform = snd_soc_lookup_platform(dev); |
374 | if (!platform) |
375 | return; |
376 | |
377 | pcm = soc_platform_to_pcm(platform); |
378 | |
379 | snd_soc_remove_platform(platform); |
380 | dmaengine_pcm_release_chan(pcm); |
381 | kfree(pcm); |
382 | } |
383 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_unregister); |
384 | |
385 | MODULE_LICENSE("GPL"); |
386 |
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