1 // SPDX-License-Identifier: GPL-2.0+
4 //	Author: Lars-Peter Clausen <[email protected]>
10 #include <sound/pcm.h>
13 #include <linux/dma-mapping.h>
28 static struct device *dmaengine_dma_dev(struct dmaengine_pcm *pcm,  in dmaengine_dma_dev()  argument
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
39  * @substream: PCM substream
57 	if (rtd->dai_link->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()
80 	struct dmaengine_pcm *pcm = soc_component_to_pcm(component);  in dmaengine_pcm_hw_params()  local
85 	if (!pcm->config->prepare_slave_config)  in dmaengine_pcm_hw_params()
90 	ret = pcm->config->prepare_slave_config(substream, params, &slave_config);  in dmaengine_pcm_hw_params()
102 	struct dmaengine_pcm *pcm = soc_component_to_pcm(component);  in dmaengine_pcm_set_runtime_hwparams()  local
103 	struct device *dma_dev = dmaengine_dma_dev(pcm, substream);  in dmaengine_pcm_set_runtime_hwparams()
104 	struct dma_chan *chan = pcm->chan[substream->stream];  in dmaengine_pcm_set_runtime_hwparams()
108 	if (rtd->dai_link->num_cpus > 1) {  in dmaengine_pcm_set_runtime_hwparams()
109 		dev_err(rtd->dev,  in dmaengine_pcm_set_runtime_hwparams()
111 		return -EINVAL;  in dmaengine_pcm_set_runtime_hwparams()
114 	if (pcm->config->pcm_hardware)  in dmaengine_pcm_set_runtime_hwparams()
116 				pcm->config->pcm_hardware);  in dmaengine_pcm_set_runtime_hwparams()
125 	hw.period_bytes_min = dma_data->maxburst * DMA_SLAVE_BUSWIDTH_8_BYTES;  in dmaengine_pcm_set_runtime_hwparams()
130 	hw.fifo_size = dma_data->fifo_size;  in dmaengine_pcm_set_runtime_hwparams()
132 	if (pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)  in dmaengine_pcm_set_runtime_hwparams()
151 	struct dmaengine_pcm *pcm = soc_component_to_pcm(component);  in dmaengine_pcm_open()  local
152 	struct dma_chan *chan = pcm->chan[substream->stream];  in dmaengine_pcm_open()
179 	struct dmaengine_pcm *pcm = soc_component_to_pcm(component);  in dmaengine_pcm_compat_request_channel()  local
182 	if (rtd->dai_link->num_cpus > 1) {  in dmaengine_pcm_compat_request_channel()
183 		dev_err(rtd->dev,  in dmaengine_pcm_compat_request_channel()
190 	if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) && pcm->chan[0])  in dmaengine_pcm_compat_request_channel()
191 		return pcm->chan[0];  in dmaengine_pcm_compat_request_channel()
193 	if (pcm->config->compat_request_channel)  in dmaengine_pcm_compat_request_channel()
194 		return pcm->config->compat_request_channel(rtd, substream);  in dmaengine_pcm_compat_request_channel()
196 	return snd_dmaengine_pcm_request_channel(pcm->config->compat_filter_fn,  in dmaengine_pcm_compat_request_channel()
197 						 dma_data->filter_data);  in dmaengine_pcm_compat_request_channel()
222 	struct dmaengine_pcm *pcm = soc_component_to_pcm(component);  in dmaengine_pcm_new()  local
223 	const struct snd_dmaengine_pcm_config *config = pcm->config;  in dmaengine_pcm_new()
224 	struct device *dev = component->dev;  in dmaengine_pcm_new()
229 	if (config->prealloc_buffer_size)  in dmaengine_pcm_new()
230 		prealloc_buffer_size = config->prealloc_buffer_size;  in dmaengine_pcm_new()
234 	if (config->pcm_hardware && config->pcm_hardware->buffer_bytes_max)  in dmaengine_pcm_new()
235 		max_buffer_size = config->pcm_hardware->buffer_bytes_max;  in dmaengine_pcm_new()
240 		struct snd_pcm_substream *substream = rtd->pcm->streams[i].substream;  in dmaengine_pcm_new()
244 		if (!pcm->chan[i] && config->chan_names[i])  in dmaengine_pcm_new()
245 			pcm->chan[i] = dma_request_slave_channel(dev,  in dmaengine_pcm_new()
246 				config->chan_names[i]);  in dmaengine_pcm_new()
248 		if (!pcm->chan[i] && (pcm->flags & SND_DMAENGINE_PCM_FLAG_COMPAT)) {  in dmaengine_pcm_new()
249 			pcm->chan[i] = dmaengine_pcm_compat_request_channel(  in dmaengine_pcm_new()
253 		if (!pcm->chan[i]) {  in dmaengine_pcm_new()
254 			dev_err(component->dev,  in dmaengine_pcm_new()
256 			return -EINVAL;  in dmaengine_pcm_new()
261 				dmaengine_dma_dev(pcm, substream),  in dmaengine_pcm_new()
265 		if (!dmaengine_pcm_can_report_residue(dev, pcm->chan[i]))  in dmaengine_pcm_new()
266 			pcm->flags |= SND_DMAENGINE_PCM_FLAG_NO_RESIDUE;  in dmaengine_pcm_new()
268 		if (rtd->pcm->streams[i].pcm->name[0] == '\0') {  in dmaengine_pcm_new()
269 			strscpy_pad(rtd->pcm->streams[i].pcm->name,  in dmaengine_pcm_new()
270 				    rtd->pcm->streams[i].pcm->id,  in dmaengine_pcm_new()
271 				    sizeof(rtd->pcm->streams[i].pcm->name));  in dmaengine_pcm_new()
282 	struct dmaengine_pcm *pcm = soc_component_to_pcm(component);  in dmaengine_pcm_pointer()  local
284 	if (pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)  in dmaengine_pcm_pointer()
295 	struct snd_pcm_runtime *runtime = substream->runtime;  in dmaengine_copy()
296 	struct dmaengine_pcm *pcm = soc_component_to_pcm(component);  in dmaengine_copy()  local
299 		       unsigned long bytes) = pcm->config->process;  in dmaengine_copy()
300 	bool is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;  in dmaengine_copy()
301 	void *dma_ptr = runtime->dma_area + hwoff +  in dmaengine_copy()
302 			channel * (runtime->dma_bytes / runtime->channels);  in dmaengine_copy()
306 			return -EFAULT;  in dmaengine_copy()
316 			return -EFAULT;  in dmaengine_copy()
357 static int dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,  in dmaengine_pcm_request_chan_of()  argument
364 	if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_DT) || (!dev->of_node &&  in dmaengine_pcm_request_chan_of()
365 	    !(config->dma_dev && config->dma_dev->of_node)))  in dmaengine_pcm_request_chan_of()
368 	if (config->dma_dev) {  in dmaengine_pcm_request_chan_of()
376 			 dev_name(config->dma_dev));  in dmaengine_pcm_request_chan_of()
377 		dev = config->dma_dev;  in dmaengine_pcm_request_chan_of()
381 		if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)  in dmaengine_pcm_request_chan_of()
382 			name = "rx-tx";  in dmaengine_pcm_request_chan_of()
385 		if (config->chan_names[i])  in dmaengine_pcm_request_chan_of()
386 			name = config->chan_names[i];  in dmaengine_pcm_request_chan_of()
394 			if (PTR_ERR(chan) == -EPROBE_DEFER)  in dmaengine_pcm_request_chan_of()
395 				return -EPROBE_DEFER;  in dmaengine_pcm_request_chan_of()
396 			pcm->chan[i] = NULL;  in dmaengine_pcm_request_chan_of()
398 			pcm->chan[i] = chan;  in dmaengine_pcm_request_chan_of()
400 		if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)  in dmaengine_pcm_request_chan_of()
404 	if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)  in dmaengine_pcm_request_chan_of()
405 		pcm->chan[1] = pcm->chan[0];  in dmaengine_pcm_request_chan_of()
410 static void dmaengine_pcm_release_chan(struct dmaengine_pcm *pcm)  in dmaengine_pcm_release_chan()  argument
415 		if (!pcm->chan[i])  in dmaengine_pcm_release_chan()
417 		dma_release_channel(pcm->chan[i]);  in dmaengine_pcm_release_chan()
418 		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
429  * @dev: The parent device for the PCM device
430  * @config: Platform specific PCM configuration
431  * @flags: Platform specific quirks
437 	struct dmaengine_pcm *pcm;  in snd_dmaengine_pcm_register()  local
440 	pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);  in snd_dmaengine_pcm_register()
441 	if (!pcm)  in snd_dmaengine_pcm_register()
442 		return -ENOMEM;  in snd_dmaengine_pcm_register()
445 	pcm->component.debugfs_prefix = "dma";  in snd_dmaengine_pcm_register()
449 	pcm->config = config;  in snd_dmaengine_pcm_register()
450 	pcm->flags = flags;  in snd_dmaengine_pcm_register()
452 	if (config->name)  in snd_dmaengine_pcm_register()
453 		pcm->component.name = config->name;  in snd_dmaengine_pcm_register()
455 	ret = dmaengine_pcm_request_chan_of(pcm, dev, config);  in snd_dmaengine_pcm_register()
459 	if (config->process)  in snd_dmaengine_pcm_register()
464 	ret = snd_soc_component_initialize(&pcm->component, driver, dev);  in snd_dmaengine_pcm_register()
468 	ret = snd_soc_add_component(&pcm->component, NULL, 0);  in snd_dmaengine_pcm_register()
475 	dmaengine_pcm_release_chan(pcm);  in snd_dmaengine_pcm_register()
476 	kfree(pcm);  in snd_dmaengine_pcm_register()
482  * snd_dmaengine_pcm_unregister - Removes a dmaengine based PCM device
483  * @dev: Parent device the PCM was register with
485  * Removes a dmaengine based PCM device previously registered with
491 	struct dmaengine_pcm *pcm;  in snd_dmaengine_pcm_unregister()  local
497 	pcm = soc_component_to_pcm(component);  in snd_dmaengine_pcm_unregister()
499 	snd_soc_unregister_component_by_driver(dev, component->driver);  in snd_dmaengine_pcm_unregister()
500 	dmaengine_pcm_release_chan(pcm);  in snd_dmaengine_pcm_unregister()
501 	kfree(pcm);  in snd_dmaengine_pcm_unregister()
505 MODULE_DESCRIPTION("ASoC helpers for generic PCM dmaengine API");