/* * Copyright (C) 2013, Analog Devices Inc. * Author: Lars-Peter Clausen * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 675 Mass Ave, Cambridge, MA 02139, USA. * */ #include #include #include #include #include #include #include #include #include #include struct dmaengine_pcm { struct dma_chan *chan[SNDRV_PCM_STREAM_CAPTURE + 1]; const struct snd_dmaengine_pcm_config *config; struct snd_soc_platform platform; unsigned int flags; }; static struct dmaengine_pcm *soc_platform_to_pcm(struct snd_soc_platform *p) { return container_of(p, struct dmaengine_pcm, platform); } /** * snd_dmaengine_pcm_prepare_slave_config() - Generic prepare_slave_config callback * @substream: PCM substream * @params: hw_params * @slave_config: DMA slave config to prepare * * This function can be used as a generic prepare_slave_config callback for * platforms which make use of the snd_dmaengine_dai_dma_data struct for their * DAI DMA data. Internally the function will first call * snd_hwparams_to_dma_slave_config to fill in the slave config based on the * hw_params, followed by snd_dmaengine_set_config_from_dai_data to fill in the * remaining fields based on the DAI DMA data. */ int snd_dmaengine_pcm_prepare_slave_config(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct snd_dmaengine_dai_dma_data *dma_data; int ret; dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream); ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config); if (ret) return ret; snd_dmaengine_pcm_set_config_from_dai_data(substream, dma_data, slave_config); return 0; } EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_prepare_slave_config); static int dmaengine_pcm_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform); struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream); struct dma_slave_config slave_config; int ret; if (pcm->config->prepare_slave_config) { ret = pcm->config->prepare_slave_config(substream, params, &slave_config); if (ret) return ret; ret = dmaengine_slave_config(chan, &slave_config); if (ret) return ret; } return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params)); } static int dmaengine_pcm_open(struct snd_pcm_substream *substream) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform); struct dma_chan *chan = pcm->chan[substream->stream]; int ret; ret = snd_soc_set_runtime_hwparams(substream, pcm->config->pcm_hardware); if (ret) return ret; return snd_dmaengine_pcm_open(substream, chan); } static struct device *dmaengine_dma_dev(struct dmaengine_pcm *pcm, struct snd_pcm_substream *substream) { if (!pcm->chan[substream->stream]) return NULL; return pcm->chan[substream->stream]->device->dev; } static void dmaengine_pcm_free(struct snd_pcm *pcm) { snd_pcm_lib_preallocate_free_for_all(pcm); } static struct dma_chan *dmaengine_pcm_compat_request_channel( struct snd_soc_pcm_runtime *rtd, struct snd_pcm_substream *substream) { struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform); if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) && pcm->chan[0]) return pcm->chan[0]; if (pcm->config->compat_request_channel) return pcm->config->compat_request_channel(rtd, substream); return snd_dmaengine_pcm_request_channel(pcm->config->compat_filter_fn, snd_soc_dai_get_dma_data(rtd->cpu_dai, substream)); } static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd) { struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform); const struct snd_dmaengine_pcm_config *config = pcm->config; struct snd_pcm_substream *substream; unsigned int i; int ret; for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) { substream = rtd->pcm->streams[i].substream; if (!substream) continue; if (!pcm->chan[i] && (pcm->flags & SND_DMAENGINE_PCM_FLAG_COMPAT)) { pcm->chan[i] = dmaengine_pcm_compat_request_channel(rtd, substream); } if (!pcm->chan[i]) { dev_err(rtd->platform->dev, "Missing dma channel for stream: %d\n", i); ret = -EINVAL; goto err_free; } ret = snd_pcm_lib_preallocate_pages(substream, SNDRV_DMA_TYPE_DEV, dmaengine_dma_dev(pcm, substream), config->prealloc_buffer_size, config->pcm_hardware->buffer_bytes_max); if (ret) goto err_free; } return 0; err_free: dmaengine_pcm_free(rtd->pcm); return ret; } static const struct snd_pcm_ops dmaengine_pcm_ops = { .open = dmaengine_pcm_open, .close = snd_dmaengine_pcm_close, .ioctl = snd_pcm_lib_ioctl, .hw_params = dmaengine_pcm_hw_params, .hw_free = snd_pcm_lib_free_pages, .trigger = snd_dmaengine_pcm_trigger, .pointer = snd_dmaengine_pcm_pointer, }; static const struct snd_soc_platform_driver dmaengine_pcm_platform = { .ops = &dmaengine_pcm_ops, .pcm_new = dmaengine_pcm_new, .pcm_free = dmaengine_pcm_free, .probe_order = SND_SOC_COMP_ORDER_LATE, }; static const struct snd_pcm_ops dmaengine_no_residue_pcm_ops = { .open = dmaengine_pcm_open, .close = snd_dmaengine_pcm_close, .ioctl = snd_pcm_lib_ioctl, .hw_params = dmaengine_pcm_hw_params, .hw_free = snd_pcm_lib_free_pages, .trigger = snd_dmaengine_pcm_trigger, .pointer = snd_dmaengine_pcm_pointer_no_residue, }; static const struct snd_soc_platform_driver dmaengine_no_residue_pcm_platform = { .ops = &dmaengine_no_residue_pcm_ops, .pcm_new = dmaengine_pcm_new, .pcm_free = dmaengine_pcm_free, .probe_order = SND_SOC_COMP_ORDER_LATE, }; static const char * const dmaengine_pcm_dma_channel_names[] = { [SNDRV_PCM_STREAM_PLAYBACK] = "tx", [SNDRV_PCM_STREAM_CAPTURE] = "rx", }; static void dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm, struct device *dev) { unsigned int i; if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_DT) || !dev->of_node) return; if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) { pcm->chan[0] = dma_request_slave_channel(dev, "rx-tx"); pcm->chan[1] = pcm->chan[0]; } else { for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) { pcm->chan[i] = dma_request_slave_channel(dev, dmaengine_pcm_dma_channel_names[i]); } } } /** * snd_dmaengine_pcm_register - Register a dmaengine based PCM device * @dev: The parent device for the PCM device * @config: Platform specific PCM configuration * @flags: Platform specific quirks */ int snd_dmaengine_pcm_register(struct device *dev, const struct snd_dmaengine_pcm_config *config, unsigned int flags) { struct dmaengine_pcm *pcm; pcm = kzalloc(sizeof(*pcm), GFP_KERNEL); if (!pcm) return -ENOMEM; pcm->config = config; pcm->flags = flags; dmaengine_pcm_request_chan_of(pcm, dev); if (flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE) return snd_soc_add_platform(dev, &pcm->platform, &dmaengine_no_residue_pcm_platform); else return snd_soc_add_platform(dev, &pcm->platform, &dmaengine_pcm_platform); } EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_register); /** * snd_dmaengine_pcm_unregister - Removes a dmaengine based PCM device * @dev: Parent device the PCM was register with * * Removes a dmaengine based PCM device previously registered with * snd_dmaengine_pcm_register. */ void snd_dmaengine_pcm_unregister(struct device *dev) { struct snd_soc_platform *platform; struct dmaengine_pcm *pcm; unsigned int i; platform = snd_soc_lookup_platform(dev); if (!platform) return; pcm = soc_platform_to_pcm(platform); for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) { if (pcm->chan[i]) { dma_release_channel(pcm->chan[i]); if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) break; } } snd_soc_remove_platform(platform); kfree(pcm); } EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_unregister); MODULE_LICENSE("GPL");