1 // SPDX-License-Identifier: GPL-2.0+
4 //	Author: Lars-Peter Clausen <lars@metafoo.de>
13 #include <linux/dma-mapping.h>
31 	if (!pcm->chan[substream->stream])  in dmaengine_dma_dev()
34 	return pcm->chan[substream->stream]->device->dev;  in dmaengine_dma_dev()
38  * snd_dmaengine_pcm_prepare_slave_config() - Generic prepare_slave_config callback
57 	if (rtd->num_cpus > 1) {  in snd_dmaengine_pcm_prepare_slave_config()
58 		dev_err(rtd->dev,  in snd_dmaengine_pcm_prepare_slave_config()
60 		return -EINVAL;  in snd_dmaengine_pcm_prepare_slave_config()
81 	struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);  in dmaengine_pcm_hw_params()  local
90 	if (!pcm->config)  in dmaengine_pcm_hw_params()
93 		prepare_slave_config = pcm->config->prepare_slave_config;  in dmaengine_pcm_hw_params()
100 		ret = dmaengine_slave_config(chan, &slave_config);  in dmaengine_pcm_hw_params()
115 	struct dma_chan *chan = pcm->chan[substream->stream];  in dmaengine_pcm_set_runtime_hwparams()  local
119 	if (rtd->num_cpus > 1) {  in dmaengine_pcm_set_runtime_hwparams()
120 		dev_err(rtd->dev,  in dmaengine_pcm_set_runtime_hwparams()
122 		return -EINVAL;  in dmaengine_pcm_set_runtime_hwparams()
125 	if (pcm->config && pcm->config->pcm_hardware)  in dmaengine_pcm_set_runtime_hwparams()
127 				pcm->config->pcm_hardware);  in dmaengine_pcm_set_runtime_hwparams()
139 	hw.fifo_size = dma_data->fifo_size;  in dmaengine_pcm_set_runtime_hwparams()
141 	if (pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)  in dmaengine_pcm_set_runtime_hwparams()
152 						  chan);  in dmaengine_pcm_set_runtime_hwparams()
161 	struct dma_chan *chan = pcm->chan[substream->stream];  in dmaengine_pcm_open()  local
168 	return snd_dmaengine_pcm_open(substream, chan);  in dmaengine_pcm_open()
192 	if (rtd->num_cpus > 1) {  in dmaengine_pcm_compat_request_channel()
193 		dev_err(rtd->dev,  in dmaengine_pcm_compat_request_channel()
200 	if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) && pcm->chan[0])  in dmaengine_pcm_compat_request_channel()
201 		return pcm->chan[0];  in dmaengine_pcm_compat_request_channel()
203 	if (pcm->config && pcm->config->compat_request_channel)  in dmaengine_pcm_compat_request_channel()
204 		return pcm->config->compat_request_channel(rtd, substream);  in dmaengine_pcm_compat_request_channel()
206 	if (pcm->config)  in dmaengine_pcm_compat_request_channel()
207 		fn = pcm->config->compat_filter_fn;  in dmaengine_pcm_compat_request_channel()
209 	return snd_dmaengine_pcm_request_channel(fn, dma_data->filter_data);  in dmaengine_pcm_compat_request_channel()
213 	struct dma_chan *chan)  in dmaengine_pcm_can_report_residue()  argument
218 	ret = dma_get_slave_caps(chan, &dma_caps);  in dmaengine_pcm_can_report_residue()
235 	const struct snd_dmaengine_pcm_config *config = pcm->config;  in dmaengine_pcm_new()
236 	struct device *dev = component->dev;  in dmaengine_pcm_new()
242 	if (config && config->prealloc_buffer_size) {  in dmaengine_pcm_new()
243 		prealloc_buffer_size = config->prealloc_buffer_size;  in dmaengine_pcm_new()
244 		max_buffer_size = config->pcm_hardware->buffer_bytes_max;  in dmaengine_pcm_new()
251 		substream = rtd->pcm->streams[i].substream;  in dmaengine_pcm_new()
255 		if (!pcm->chan[i] && config && config->chan_names[i])  in dmaengine_pcm_new()
256 			pcm->chan[i] = dma_request_slave_channel(dev,  in dmaengine_pcm_new()
257 				config->chan_names[i]);  in dmaengine_pcm_new()
259 		if (!pcm->chan[i] && (pcm->flags & SND_DMAENGINE_PCM_FLAG_COMPAT)) {  in dmaengine_pcm_new()
260 			pcm->chan[i] = dmaengine_pcm_compat_request_channel(  in dmaengine_pcm_new()
264 		if (!pcm->chan[i]) {  in dmaengine_pcm_new()
265 			dev_err(component->dev,  in dmaengine_pcm_new()
267 			return -EINVAL;  in dmaengine_pcm_new()
276 		if (!dmaengine_pcm_can_report_residue(dev, pcm->chan[i]))  in dmaengine_pcm_new()
277 			pcm->flags |= SND_DMAENGINE_PCM_FLAG_NO_RESIDUE;  in dmaengine_pcm_new()
279 		if (rtd->pcm->streams[i].pcm->name[0] == '\0') {  in dmaengine_pcm_new()
280 			strscpy_pad(rtd->pcm->streams[i].pcm->name,  in dmaengine_pcm_new()
281 				    rtd->pcm->streams[i].pcm->id,  in dmaengine_pcm_new()
282 				    sizeof(rtd->pcm->streams[i].pcm->name));  in dmaengine_pcm_new()
295 	if (pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)  in dmaengine_pcm_pointer()
306 	struct snd_pcm_runtime *runtime = substream->runtime;  in dmaengine_copy_user()
310 		       void *buf, unsigned long bytes) = pcm->config->process;  in dmaengine_copy_user()
311 	bool is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;  in dmaengine_copy_user()
312 	void *dma_ptr = runtime->dma_area + hwoff +  in dmaengine_copy_user()
313 			channel * (runtime->dma_bytes / runtime->channels);  in dmaengine_copy_user()
318 			return -EFAULT;  in dmaengine_copy_user()
328 			return -EFAULT;  in dmaengine_copy_user()
334 	.name		= SND_DMAENGINE_PCM_DRV_NAME,
345 	.name		= SND_DMAENGINE_PCM_DRV_NAME,
365 	const char *name;  in dmaengine_pcm_request_chan_of()  local
366 	struct dma_chan *chan;  in dmaengine_pcm_request_chan_of()  local
368 	if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_DT) || (!dev->of_node &&  in dmaengine_pcm_request_chan_of()
369 	    !(config && config->dma_dev && config->dma_dev->of_node)))  in dmaengine_pcm_request_chan_of()
372 	if (config && config->dma_dev) {  in dmaengine_pcm_request_chan_of()
380 			 dev_name(config->dma_dev));  in dmaengine_pcm_request_chan_of()
381 		dev = config->dma_dev;  in dmaengine_pcm_request_chan_of()
385 		if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)  in dmaengine_pcm_request_chan_of()
386 			name = "rx-tx";  in dmaengine_pcm_request_chan_of()
388 			name = dmaengine_pcm_dma_channel_names[i];  in dmaengine_pcm_request_chan_of()
389 		if (config && config->chan_names[i])  in dmaengine_pcm_request_chan_of()
390 			name = config->chan_names[i];  in dmaengine_pcm_request_chan_of()
391 		chan = dma_request_chan(dev, name);  in dmaengine_pcm_request_chan_of()
392 		if (IS_ERR(chan)) {  in dmaengine_pcm_request_chan_of()
398 			if (PTR_ERR(chan) == -EPROBE_DEFER)  in dmaengine_pcm_request_chan_of()
399 				return -EPROBE_DEFER;  in dmaengine_pcm_request_chan_of()
400 			pcm->chan[i] = NULL;  in dmaengine_pcm_request_chan_of()
402 			pcm->chan[i] = chan;  in dmaengine_pcm_request_chan_of()
404 		if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)  in dmaengine_pcm_request_chan_of()
408 	if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)  in dmaengine_pcm_request_chan_of()
409 		pcm->chan[1] = pcm->chan[0];  in dmaengine_pcm_request_chan_of()
419 		if (!pcm->chan[i])  in dmaengine_pcm_release_chan()
421 		dma_release_channel(pcm->chan[i]);  in dmaengine_pcm_release_chan()
422 		if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)  in dmaengine_pcm_release_chan()
428  * snd_dmaengine_pcm_register - Register a dmaengine based PCM device
442 		return -ENOMEM;  in snd_dmaengine_pcm_register()
445 	pcm->component.debugfs_prefix = "dma";  in snd_dmaengine_pcm_register()
447 	pcm->config = config;  in snd_dmaengine_pcm_register()
448 	pcm->flags = flags;  in snd_dmaengine_pcm_register()
454 	if (config && config->process)  in snd_dmaengine_pcm_register()
459 	ret = snd_soc_component_initialize(&pcm->component, driver, dev);  in snd_dmaengine_pcm_register()
463 	ret = snd_soc_add_component(&pcm->component, NULL, 0);  in snd_dmaengine_pcm_register()
477  * snd_dmaengine_pcm_unregister - Removes a dmaengine based PCM device
494 	snd_soc_unregister_component_by_driver(dev, component->driver);  in snd_dmaengine_pcm_unregister()