diff options
Diffstat (limited to 'sound/soc/tegra/tegra_pcm.c')
| -rw-r--r-- | sound/soc/tegra/tegra_pcm.c | 171 |
1 files changed, 155 insertions, 16 deletions
diff --git a/sound/soc/tegra/tegra_pcm.c b/sound/soc/tegra/tegra_pcm.c index 93caed500565..05d59e03b1c5 100644 --- a/sound/soc/tegra/tegra_pcm.c +++ b/sound/soc/tegra/tegra_pcm.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * tegra_pcm.c - Tegra PCM driver * @@ -12,30 +13,15 @@ * * Copyright (C) 2010 Google, Inc. * Iliyan Malchev <malchev@google.com> - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * version 2 as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * 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., 51 Franklin St, Fifth Floor, Boston, MA - * 02110-1301 USA - * */ #include <linux/module.h> +#include <linux/dma-mapping.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/pcm_params.h> #include <sound/soc.h> #include <sound/dmaengine_pcm.h> - #include "tegra_pcm.h" static const struct snd_pcm_hardware tegra_pcm_hardware = { @@ -62,6 +48,12 @@ int tegra_pcm_platform_register(struct device *dev) } EXPORT_SYMBOL_GPL(tegra_pcm_platform_register); +int devm_tegra_pcm_platform_register(struct device *dev) +{ + return devm_snd_dmaengine_pcm_register(dev, &tegra_dmaengine_pcm_config, 0); +} +EXPORT_SYMBOL_GPL(devm_tegra_pcm_platform_register); + int tegra_pcm_platform_register_with_chan_names(struct device *dev, struct snd_dmaengine_pcm_config *config, char *txdmachan, char *rxdmachan) @@ -81,6 +73,153 @@ void tegra_pcm_platform_unregister(struct device *dev) } EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister); +int tegra_pcm_open(struct snd_soc_component *component, + struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream); + struct snd_dmaengine_dai_dma_data *dmap; + struct dma_chan *chan; + struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0); + int ret; + + if (rtd->dai_link->no_pcm) + return 0; + + dmap = snd_soc_dai_get_dma_data(cpu_dai, substream); + + /* Set HW params now that initialization is complete */ + snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware); + + /* Ensure period size is multiple of 8 */ + ret = snd_pcm_hw_constraint_step(substream->runtime, 0, + SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 0x8); + if (ret) { + dev_err(rtd->dev, "failed to set constraint %d\n", ret); + return ret; + } + + chan = dma_request_chan(cpu_dai->dev, dmap->chan_name); + if (IS_ERR(chan)) { + dev_err(cpu_dai->dev, + "dmaengine request slave channel failed! (%s)\n", + dmap->chan_name); + return -ENODEV; + } + + ret = snd_dmaengine_pcm_open(substream, chan); + if (ret) { + dev_err(rtd->dev, + "dmaengine pcm open failed with err %d (%s)\n", ret, + dmap->chan_name); + + dma_release_channel(chan); + + return ret; + } + + /* Set wait time to 500ms by default */ + substream->wait_time = 500; + + return 0; +} +EXPORT_SYMBOL_GPL(tegra_pcm_open); + +int tegra_pcm_close(struct snd_soc_component *component, + struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream); + + if (rtd->dai_link->no_pcm) + return 0; + + snd_dmaengine_pcm_close_release_chan(substream); + + return 0; +} +EXPORT_SYMBOL_GPL(tegra_pcm_close); + +int tegra_pcm_hw_params(struct snd_soc_component *component, + struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params) +{ + struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream); + struct snd_dmaengine_dai_dma_data *dmap; + struct dma_slave_config slave_config; + struct dma_chan *chan; + int ret; + + if (rtd->dai_link->no_pcm) + return 0; + + dmap = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream); + if (!dmap) + return 0; + + chan = snd_dmaengine_pcm_get_chan(substream); + + ret = snd_hwparams_to_dma_slave_config(substream, params, + &slave_config); + if (ret) { + dev_err(rtd->dev, "hw params config failed with err %d\n", ret); + return ret; + } + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { + slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + slave_config.dst_addr = dmap->addr; + slave_config.dst_maxburst = 8; + } else { + slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + slave_config.src_addr = dmap->addr; + slave_config.src_maxburst = 8; + } + + ret = dmaengine_slave_config(chan, &slave_config); + if (ret < 0) { + dev_err(rtd->dev, "dma slave config failed with err %d\n", ret); + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(tegra_pcm_hw_params); + +snd_pcm_uframes_t tegra_pcm_pointer(struct snd_soc_component *component, + struct snd_pcm_substream *substream) +{ + return snd_dmaengine_pcm_pointer(substream); +} +EXPORT_SYMBOL_GPL(tegra_pcm_pointer); + +static int tegra_pcm_dma_allocate(struct device *dev, struct snd_soc_pcm_runtime *rtd, + size_t size) +{ + struct snd_pcm *pcm = rtd->pcm; + int ret; + + ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); + if (ret < 0) + return ret; + + return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_WC, dev, size); +} + +int tegra_pcm_construct(struct snd_soc_component *component, + struct snd_soc_pcm_runtime *rtd) +{ + struct device *dev = component->dev; + + /* + * Fallback for backwards-compatibility with older device trees that + * have the iommus property in the virtual, top-level "sound" node. + */ + if (!of_property_present(dev->of_node, "iommus")) + dev = rtd->card->snd_card->dev; + + return tegra_pcm_dma_allocate(dev, rtd, tegra_pcm_hardware.buffer_bytes_max); +} +EXPORT_SYMBOL_GPL(tegra_pcm_construct); + MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>"); MODULE_DESCRIPTION("Tegra PCM ASoC driver"); MODULE_LICENSE("GPL"); |