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28c4468b LPC |
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> | |
28c4468b LPC |
24 | |
25 | #include <sound/dmaengine_pcm.h> | |
26 | ||
27 | struct dmaengine_pcm { | |
28 | struct dma_chan *chan[SNDRV_PCM_STREAM_CAPTURE + 1]; | |
29 | const struct snd_dmaengine_pcm_config *config; | |
30 | struct snd_soc_platform platform; | |
d1e1406c | 31 | unsigned int flags; |
28c4468b LPC |
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 | ||
c0de42bf LPC |
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 | ||
28c4468b LPC |
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); | |
fa654e08 LPC |
87 | int (*prepare_slave_config)(struct snd_pcm_substream *substream, |
88 | struct snd_pcm_hw_params *params, | |
89 | struct dma_slave_config *slave_config); | |
28c4468b LPC |
90 | struct dma_slave_config slave_config; |
91 | int ret; | |
92 | ||
fa654e08 LPC |
93 | if (!pcm->config) |
94 | prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config; | |
95 | else | |
96 | prepare_slave_config = pcm->config->prepare_slave_config; | |
97 | ||
98 | if (prepare_slave_config) { | |
99 | ret = prepare_slave_config(substream, params, &slave_config); | |
28c4468b LPC |
100 | if (ret) |
101 | return ret; | |
102 | ||
103 | ret = dmaengine_slave_config(chan, &slave_config); | |
104 | if (ret) | |
105 | return ret; | |
106 | } | |
107 | ||
108 | return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params)); | |
109 | } | |
110 | ||
c0de42bf | 111 | static int dmaengine_pcm_set_runtime_hwparams(struct snd_pcm_substream *substream) |
28c4468b LPC |
112 | { |
113 | struct snd_soc_pcm_runtime *rtd = substream->private_data; | |
114 | struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform); | |
c0de42bf | 115 | struct device *dma_dev = dmaengine_dma_dev(pcm, substream); |
28c4468b | 116 | struct dma_chan *chan = pcm->chan[substream->stream]; |
c0de42bf LPC |
117 | struct snd_dmaengine_dai_dma_data *dma_data; |
118 | struct dma_slave_caps dma_caps; | |
119 | struct snd_pcm_hardware hw; | |
28c4468b LPC |
120 | int ret; |
121 | ||
fa654e08 | 122 | if (pcm->config && pcm->config->pcm_hardware) |
c0de42bf | 123 | return snd_soc_set_runtime_hwparams(substream, |
28c4468b | 124 | pcm->config->pcm_hardware); |
28c4468b | 125 | |
c0de42bf LPC |
126 | dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); |
127 | ||
128 | memset(&hw, 0, sizeof(hw)); | |
129 | hw.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | | |
130 | SNDRV_PCM_INFO_INTERLEAVED; | |
131 | hw.periods_min = 2; | |
132 | hw.periods_max = UINT_MAX; | |
133 | hw.period_bytes_min = 256; | |
134 | hw.period_bytes_max = dma_get_max_seg_size(dma_dev); | |
135 | hw.buffer_bytes_max = SIZE_MAX; | |
136 | hw.fifo_size = dma_data->fifo_size; | |
137 | ||
138 | ret = dma_get_slave_caps(chan, &dma_caps); | |
139 | if (ret == 0) { | |
140 | if (dma_caps.cmd_pause) | |
141 | hw.info |= SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME; | |
142 | } | |
143 | ||
144 | return snd_soc_set_runtime_hwparams(substream, &hw); | |
28c4468b LPC |
145 | } |
146 | ||
c0de42bf | 147 | static int dmaengine_pcm_open(struct snd_pcm_substream *substream) |
28c4468b | 148 | { |
c0de42bf LPC |
149 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
150 | struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform); | |
151 | struct dma_chan *chan = pcm->chan[substream->stream]; | |
152 | int ret; | |
28c4468b | 153 | |
c0de42bf LPC |
154 | ret = dmaengine_pcm_set_runtime_hwparams(substream); |
155 | if (ret) | |
156 | return ret; | |
157 | ||
158 | return snd_dmaengine_pcm_open(substream, chan); | |
28c4468b LPC |
159 | } |
160 | ||
161 | static void dmaengine_pcm_free(struct snd_pcm *pcm) | |
162 | { | |
163 | snd_pcm_lib_preallocate_free_for_all(pcm); | |
164 | } | |
165 | ||
c999836d LPC |
166 | static struct dma_chan *dmaengine_pcm_compat_request_channel( |
167 | struct snd_soc_pcm_runtime *rtd, | |
168 | struct snd_pcm_substream *substream) | |
169 | { | |
170 | struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform); | |
171 | ||
d1e1406c LPC |
172 | if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) && pcm->chan[0]) |
173 | return pcm->chan[0]; | |
174 | ||
c999836d LPC |
175 | if (pcm->config->compat_request_channel) |
176 | return pcm->config->compat_request_channel(rtd, substream); | |
177 | ||
178 | return snd_dmaengine_pcm_request_channel(pcm->config->compat_filter_fn, | |
179 | snd_soc_dai_get_dma_data(rtd->cpu_dai, substream)); | |
180 | } | |
181 | ||
28c4468b LPC |
182 | static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd) |
183 | { | |
184 | struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform); | |
185 | const struct snd_dmaengine_pcm_config *config = pcm->config; | |
186 | struct snd_pcm_substream *substream; | |
fa654e08 LPC |
187 | size_t prealloc_buffer_size; |
188 | size_t max_buffer_size; | |
28c4468b LPC |
189 | unsigned int i; |
190 | int ret; | |
191 | ||
fa654e08 LPC |
192 | if (config && config->prealloc_buffer_size) { |
193 | prealloc_buffer_size = config->prealloc_buffer_size; | |
194 | max_buffer_size = config->pcm_hardware->buffer_bytes_max; | |
195 | } else { | |
196 | prealloc_buffer_size = 512 * 1024; | |
197 | max_buffer_size = SIZE_MAX; | |
198 | } | |
199 | ||
200 | ||
28c4468b LPC |
201 | for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) { |
202 | substream = rtd->pcm->streams[i].substream; | |
203 | if (!substream) | |
204 | continue; | |
205 | ||
d1e1406c | 206 | if (!pcm->chan[i] && (pcm->flags & SND_DMAENGINE_PCM_FLAG_COMPAT)) { |
c999836d LPC |
207 | pcm->chan[i] = dmaengine_pcm_compat_request_channel(rtd, |
208 | substream); | |
209 | } | |
210 | ||
28c4468b LPC |
211 | if (!pcm->chan[i]) { |
212 | dev_err(rtd->platform->dev, | |
213 | "Missing dma channel for stream: %d\n", i); | |
214 | ret = -EINVAL; | |
215 | goto err_free; | |
216 | } | |
217 | ||
218 | ret = snd_pcm_lib_preallocate_pages(substream, | |
219 | SNDRV_DMA_TYPE_DEV, | |
220 | dmaengine_dma_dev(pcm, substream), | |
fa654e08 LPC |
221 | prealloc_buffer_size, |
222 | max_buffer_size); | |
28c4468b LPC |
223 | if (ret) |
224 | goto err_free; | |
225 | } | |
226 | ||
227 | return 0; | |
228 | ||
229 | err_free: | |
230 | dmaengine_pcm_free(rtd->pcm); | |
231 | return ret; | |
232 | } | |
233 | ||
234 | static const struct snd_pcm_ops dmaengine_pcm_ops = { | |
235 | .open = dmaengine_pcm_open, | |
236 | .close = snd_dmaengine_pcm_close, | |
237 | .ioctl = snd_pcm_lib_ioctl, | |
238 | .hw_params = dmaengine_pcm_hw_params, | |
239 | .hw_free = snd_pcm_lib_free_pages, | |
240 | .trigger = snd_dmaengine_pcm_trigger, | |
241 | .pointer = snd_dmaengine_pcm_pointer, | |
242 | }; | |
243 | ||
244 | static const struct snd_soc_platform_driver dmaengine_pcm_platform = { | |
245 | .ops = &dmaengine_pcm_ops, | |
246 | .pcm_new = dmaengine_pcm_new, | |
247 | .pcm_free = dmaengine_pcm_free, | |
c999836d | 248 | .probe_order = SND_SOC_COMP_ORDER_LATE, |
28c4468b LPC |
249 | }; |
250 | ||
610f7800 LPC |
251 | static const struct snd_pcm_ops dmaengine_no_residue_pcm_ops = { |
252 | .open = dmaengine_pcm_open, | |
253 | .close = snd_dmaengine_pcm_close, | |
254 | .ioctl = snd_pcm_lib_ioctl, | |
255 | .hw_params = dmaengine_pcm_hw_params, | |
256 | .hw_free = snd_pcm_lib_free_pages, | |
257 | .trigger = snd_dmaengine_pcm_trigger, | |
258 | .pointer = snd_dmaengine_pcm_pointer_no_residue, | |
259 | }; | |
260 | ||
261 | static const struct snd_soc_platform_driver dmaengine_no_residue_pcm_platform = { | |
262 | .ops = &dmaengine_no_residue_pcm_ops, | |
263 | .pcm_new = dmaengine_pcm_new, | |
264 | .pcm_free = dmaengine_pcm_free, | |
265 | .probe_order = SND_SOC_COMP_ORDER_LATE, | |
266 | }; | |
267 | ||
28c4468b LPC |
268 | static const char * const dmaengine_pcm_dma_channel_names[] = { |
269 | [SNDRV_PCM_STREAM_PLAYBACK] = "tx", | |
270 | [SNDRV_PCM_STREAM_CAPTURE] = "rx", | |
271 | }; | |
272 | ||
d1e1406c | 273 | static void dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm, |
6f1fd93e | 274 | struct device *dev) |
d1e1406c LPC |
275 | { |
276 | unsigned int i; | |
277 | ||
6f1fd93e | 278 | if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_DT) || !dev->of_node) |
d1e1406c LPC |
279 | return; |
280 | ||
281 | if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) { | |
6f1fd93e | 282 | pcm->chan[0] = dma_request_slave_channel(dev, "rx-tx"); |
d1e1406c LPC |
283 | pcm->chan[1] = pcm->chan[0]; |
284 | } else { | |
285 | for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) { | |
6f1fd93e | 286 | pcm->chan[i] = dma_request_slave_channel(dev, |
d1e1406c LPC |
287 | dmaengine_pcm_dma_channel_names[i]); |
288 | } | |
289 | } | |
290 | } | |
291 | ||
28c4468b LPC |
292 | /** |
293 | * snd_dmaengine_pcm_register - Register a dmaengine based PCM device | |
294 | * @dev: The parent device for the PCM device | |
295 | * @config: Platform specific PCM configuration | |
296 | * @flags: Platform specific quirks | |
297 | */ | |
298 | int snd_dmaengine_pcm_register(struct device *dev, | |
299 | const struct snd_dmaengine_pcm_config *config, unsigned int flags) | |
300 | { | |
301 | struct dmaengine_pcm *pcm; | |
28c4468b | 302 | |
28c4468b LPC |
303 | pcm = kzalloc(sizeof(*pcm), GFP_KERNEL); |
304 | if (!pcm) | |
305 | return -ENOMEM; | |
306 | ||
307 | pcm->config = config; | |
d1e1406c | 308 | pcm->flags = flags; |
28c4468b | 309 | |
6f1fd93e | 310 | dmaengine_pcm_request_chan_of(pcm, dev); |
28c4468b | 311 | |
610f7800 LPC |
312 | if (flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE) |
313 | return snd_soc_add_platform(dev, &pcm->platform, | |
314 | &dmaengine_no_residue_pcm_platform); | |
315 | else | |
316 | return snd_soc_add_platform(dev, &pcm->platform, | |
28c4468b LPC |
317 | &dmaengine_pcm_platform); |
318 | } | |
319 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_register); | |
320 | ||
321 | /** | |
322 | * snd_dmaengine_pcm_unregister - Removes a dmaengine based PCM device | |
323 | * @dev: Parent device the PCM was register with | |
324 | * | |
325 | * Removes a dmaengine based PCM device previously registered with | |
326 | * snd_dmaengine_pcm_register. | |
327 | */ | |
328 | void snd_dmaengine_pcm_unregister(struct device *dev) | |
329 | { | |
330 | struct snd_soc_platform *platform; | |
331 | struct dmaengine_pcm *pcm; | |
332 | unsigned int i; | |
333 | ||
334 | platform = snd_soc_lookup_platform(dev); | |
335 | if (!platform) | |
336 | return; | |
337 | ||
338 | pcm = soc_platform_to_pcm(platform); | |
339 | ||
340 | for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) { | |
d1e1406c | 341 | if (pcm->chan[i]) { |
28c4468b | 342 | dma_release_channel(pcm->chan[i]); |
d1e1406c LPC |
343 | if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) |
344 | break; | |
345 | } | |
28c4468b LPC |
346 | } |
347 | ||
348 | snd_soc_remove_platform(platform); | |
349 | kfree(pcm); | |
350 | } | |
351 | EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_unregister); | |
352 | ||
353 | MODULE_LICENSE("GPL"); |