2 * Copyright (C) 2013, Analog Devices Inc.
3 * Author: Lars-Peter Clausen <lars@metafoo.de>
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.
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.
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>
25 #include <sound/dmaengine_pcm.h>
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;
34 static struct dmaengine_pcm *soc_platform_to_pcm(struct snd_soc_platform *p)
36 return container_of(p, struct dmaengine_pcm, platform);
39 static struct device *dmaengine_dma_dev(struct dmaengine_pcm *pcm,
40 struct snd_pcm_substream *substream)
42 if (!pcm->chan[substream->stream])
45 return pcm->chan[substream->stream]->device->dev;
49 * snd_dmaengine_pcm_prepare_slave_config() - Generic prepare_slave_config callback
50 * @substream: PCM substream
52 * @slave_config: DMA slave config to prepare
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.
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)
64 struct snd_soc_pcm_runtime *rtd = substream->private_data;
65 struct snd_dmaengine_dai_dma_data *dma_data;
68 dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
70 ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
74 snd_dmaengine_pcm_set_config_from_dai_data(substream, dma_data,
79 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_prepare_slave_config);
81 static int dmaengine_pcm_hw_params(struct snd_pcm_substream *substream,
82 struct snd_pcm_hw_params *params)
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;
94 prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config;
96 prepare_slave_config = pcm->config->prepare_slave_config;
98 if (prepare_slave_config) {
99 ret = prepare_slave_config(substream, params, &slave_config);
103 ret = dmaengine_slave_config(chan, &slave_config);
108 return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
111 static int dmaengine_pcm_set_runtime_hwparams(struct snd_pcm_substream *substream)
113 struct snd_soc_pcm_runtime *rtd = substream->private_data;
114 struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
115 struct device *dma_dev = dmaengine_dma_dev(pcm, substream);
116 struct dma_chan *chan = pcm->chan[substream->stream];
117 struct snd_dmaengine_dai_dma_data *dma_data;
118 struct dma_slave_caps dma_caps;
119 struct snd_pcm_hardware hw;
122 if (pcm->config && pcm->config->pcm_hardware)
123 return snd_soc_set_runtime_hwparams(substream,
124 pcm->config->pcm_hardware);
126 dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
128 memset(&hw, 0, sizeof(hw));
129 hw.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
130 SNDRV_PCM_INFO_INTERLEAVED;
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;
138 ret = dma_get_slave_caps(chan, &dma_caps);
140 if (dma_caps.cmd_pause)
141 hw.info |= SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME;
144 return snd_soc_set_runtime_hwparams(substream, &hw);
147 static int dmaengine_pcm_open(struct snd_pcm_substream *substream)
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];
154 ret = dmaengine_pcm_set_runtime_hwparams(substream);
158 return snd_dmaengine_pcm_open(substream, chan);
161 static void dmaengine_pcm_free(struct snd_pcm *pcm)
163 snd_pcm_lib_preallocate_free_for_all(pcm);
166 static struct dma_chan *dmaengine_pcm_compat_request_channel(
167 struct snd_soc_pcm_runtime *rtd,
168 struct snd_pcm_substream *substream)
170 struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
171 struct snd_dmaengine_dai_dma_data *dma_data;
173 dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
175 if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) && pcm->chan[0])
178 if (pcm->config->compat_request_channel)
179 return pcm->config->compat_request_channel(rtd, substream);
181 return snd_dmaengine_pcm_request_channel(pcm->config->compat_filter_fn,
182 dma_data->filter_data);
185 static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
187 struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
188 const struct snd_dmaengine_pcm_config *config = pcm->config;
189 struct device *dev = rtd->platform->dev;
190 struct snd_dmaengine_dai_dma_data *dma_data;
191 struct snd_pcm_substream *substream;
192 size_t prealloc_buffer_size;
193 size_t max_buffer_size;
197 if (config && config->prealloc_buffer_size) {
198 prealloc_buffer_size = config->prealloc_buffer_size;
199 max_buffer_size = config->pcm_hardware->buffer_bytes_max;
201 prealloc_buffer_size = 512 * 1024;
202 max_buffer_size = SIZE_MAX;
206 for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
207 substream = rtd->pcm->streams[i].substream;
211 dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
214 (pcm->flags & SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME))
215 pcm->chan[i] = dma_request_slave_channel(dev,
216 dma_data->chan_name);
218 if (!pcm->chan[i] && (pcm->flags & SND_DMAENGINE_PCM_FLAG_COMPAT)) {
219 pcm->chan[i] = dmaengine_pcm_compat_request_channel(rtd,
224 dev_err(rtd->platform->dev,
225 "Missing dma channel for stream: %d\n", i);
230 ret = snd_pcm_lib_preallocate_pages(substream,
232 dmaengine_dma_dev(pcm, substream),
233 prealloc_buffer_size,
242 dmaengine_pcm_free(rtd->pcm);
246 static const struct snd_pcm_ops dmaengine_pcm_ops = {
247 .open = dmaengine_pcm_open,
248 .close = snd_dmaengine_pcm_close,
249 .ioctl = snd_pcm_lib_ioctl,
250 .hw_params = dmaengine_pcm_hw_params,
251 .hw_free = snd_pcm_lib_free_pages,
252 .trigger = snd_dmaengine_pcm_trigger,
253 .pointer = snd_dmaengine_pcm_pointer,
256 static const struct snd_soc_platform_driver dmaengine_pcm_platform = {
257 .ops = &dmaengine_pcm_ops,
258 .pcm_new = dmaengine_pcm_new,
259 .pcm_free = dmaengine_pcm_free,
260 .probe_order = SND_SOC_COMP_ORDER_LATE,
263 static const struct snd_pcm_ops dmaengine_no_residue_pcm_ops = {
264 .open = dmaengine_pcm_open,
265 .close = snd_dmaengine_pcm_close,
266 .ioctl = snd_pcm_lib_ioctl,
267 .hw_params = dmaengine_pcm_hw_params,
268 .hw_free = snd_pcm_lib_free_pages,
269 .trigger = snd_dmaengine_pcm_trigger,
270 .pointer = snd_dmaengine_pcm_pointer_no_residue,
273 static const struct snd_soc_platform_driver dmaengine_no_residue_pcm_platform = {
274 .ops = &dmaengine_no_residue_pcm_ops,
275 .pcm_new = dmaengine_pcm_new,
276 .pcm_free = dmaengine_pcm_free,
277 .probe_order = SND_SOC_COMP_ORDER_LATE,
280 static const char * const dmaengine_pcm_dma_channel_names[] = {
281 [SNDRV_PCM_STREAM_PLAYBACK] = "tx",
282 [SNDRV_PCM_STREAM_CAPTURE] = "rx",
285 static void dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
290 if ((pcm->flags & (SND_DMAENGINE_PCM_FLAG_NO_DT |
291 SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME)) ||
295 if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) {
296 pcm->chan[0] = dma_request_slave_channel(dev, "rx-tx");
297 pcm->chan[1] = pcm->chan[0];
299 for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
300 pcm->chan[i] = dma_request_slave_channel(dev,
301 dmaengine_pcm_dma_channel_names[i]);
307 * snd_dmaengine_pcm_register - Register a dmaengine based PCM device
308 * @dev: The parent device for the PCM device
309 * @config: Platform specific PCM configuration
310 * @flags: Platform specific quirks
312 int snd_dmaengine_pcm_register(struct device *dev,
313 const struct snd_dmaengine_pcm_config *config, unsigned int flags)
315 struct dmaengine_pcm *pcm;
317 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
321 pcm->config = config;
324 dmaengine_pcm_request_chan_of(pcm, dev);
326 if (flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
327 return snd_soc_add_platform(dev, &pcm->platform,
328 &dmaengine_no_residue_pcm_platform);
330 return snd_soc_add_platform(dev, &pcm->platform,
331 &dmaengine_pcm_platform);
333 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_register);
336 * snd_dmaengine_pcm_unregister - Removes a dmaengine based PCM device
337 * @dev: Parent device the PCM was register with
339 * Removes a dmaengine based PCM device previously registered with
340 * snd_dmaengine_pcm_register.
342 void snd_dmaengine_pcm_unregister(struct device *dev)
344 struct snd_soc_platform *platform;
345 struct dmaengine_pcm *pcm;
348 platform = snd_soc_lookup_platform(dev);
352 pcm = soc_platform_to_pcm(platform);
354 for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
356 dma_release_channel(pcm->chan[i]);
357 if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
362 snd_soc_remove_platform(platform);
365 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_unregister);
367 MODULE_LICENSE("GPL");