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86f29c7442
We intentionally do not return an error if we get a permanent failure from dma_request_chan() in order to support systems which have TX only or RX only channels. Add a comment documenting this. Reported-by: Andy Shevchenko <andriy.shevchenko@intel.com> Signed-off-by: Mark Brown <broonie@kernel.org> Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com> Link: https://lore.kernel.org/r/20201008161105.21804-1-broonie@kernel.org Signed-off-by: Mark Brown <broonie@kernel.org>
497 lines
14 KiB
C
497 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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//
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// Copyright (C) 2013, Analog Devices Inc.
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// Author: Lars-Peter Clausen <lars@metafoo.de>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/dmaengine.h>
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#include <linux/slab.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include <linux/dma-mapping.h>
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#include <linux/of.h>
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#include <sound/dmaengine_pcm.h>
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/*
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* The platforms dmaengine driver does not support reporting the amount of
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* bytes that are still left to transfer.
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*/
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#define SND_DMAENGINE_PCM_FLAG_NO_RESIDUE BIT(31)
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static struct device *dmaengine_dma_dev(struct dmaengine_pcm *pcm,
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struct snd_pcm_substream *substream)
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{
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if (!pcm->chan[substream->stream])
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return NULL;
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return pcm->chan[substream->stream]->device->dev;
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}
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/**
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* snd_dmaengine_pcm_prepare_slave_config() - Generic prepare_slave_config callback
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* @substream: PCM substream
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* @params: hw_params
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* @slave_config: DMA slave config to prepare
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*
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* This function can be used as a generic prepare_slave_config callback for
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* platforms which make use of the snd_dmaengine_dai_dma_data struct for their
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* DAI DMA data. Internally the function will first call
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* snd_hwparams_to_dma_slave_config to fill in the slave config based on the
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* hw_params, followed by snd_dmaengine_set_config_from_dai_data to fill in the
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* remaining fields based on the DAI DMA data.
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*/
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int snd_dmaengine_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config)
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{
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
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struct snd_dmaengine_dai_dma_data *dma_data;
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int ret;
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if (rtd->num_cpus > 1) {
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dev_err(rtd->dev,
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"%s doesn't support Multi CPU yet\n", __func__);
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return -EINVAL;
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}
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dma_data = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
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ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
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if (ret)
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return ret;
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snd_dmaengine_pcm_set_config_from_dai_data(substream, dma_data,
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slave_config);
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return 0;
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}
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EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_prepare_slave_config);
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static int dmaengine_pcm_hw_params(struct snd_soc_component *component,
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struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct dmaengine_pcm *pcm = soc_component_to_pcm(component);
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struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
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int (*prepare_slave_config)(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params,
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struct dma_slave_config *slave_config);
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struct dma_slave_config slave_config;
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int ret;
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memset(&slave_config, 0, sizeof(slave_config));
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if (!pcm->config)
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prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config;
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else
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prepare_slave_config = pcm->config->prepare_slave_config;
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if (prepare_slave_config) {
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ret = prepare_slave_config(substream, params, &slave_config);
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if (ret)
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return ret;
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ret = dmaengine_slave_config(chan, &slave_config);
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if (ret)
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return ret;
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}
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return 0;
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}
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static int
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dmaengine_pcm_set_runtime_hwparams(struct snd_soc_component *component,
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struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
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struct dmaengine_pcm *pcm = soc_component_to_pcm(component);
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struct device *dma_dev = dmaengine_dma_dev(pcm, substream);
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struct dma_chan *chan = pcm->chan[substream->stream];
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struct snd_dmaengine_dai_dma_data *dma_data;
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struct snd_pcm_hardware hw;
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if (rtd->num_cpus > 1) {
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dev_err(rtd->dev,
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"%s doesn't support Multi CPU yet\n", __func__);
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return -EINVAL;
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}
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if (pcm->config && pcm->config->pcm_hardware)
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return snd_soc_set_runtime_hwparams(substream,
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pcm->config->pcm_hardware);
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dma_data = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
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memset(&hw, 0, sizeof(hw));
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hw.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_INTERLEAVED;
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hw.periods_min = 2;
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hw.periods_max = UINT_MAX;
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hw.period_bytes_min = 256;
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hw.period_bytes_max = dma_get_max_seg_size(dma_dev);
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hw.buffer_bytes_max = SIZE_MAX;
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hw.fifo_size = dma_data->fifo_size;
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if (pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
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hw.info |= SNDRV_PCM_INFO_BATCH;
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/**
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* FIXME: Remove the return value check to align with the code
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* before adding snd_dmaengine_pcm_refine_runtime_hwparams
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* function.
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*/
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snd_dmaengine_pcm_refine_runtime_hwparams(substream,
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dma_data,
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&hw,
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chan);
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return snd_soc_set_runtime_hwparams(substream, &hw);
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}
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static int dmaengine_pcm_open(struct snd_soc_component *component,
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struct snd_pcm_substream *substream)
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{
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struct dmaengine_pcm *pcm = soc_component_to_pcm(component);
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struct dma_chan *chan = pcm->chan[substream->stream];
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int ret;
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ret = dmaengine_pcm_set_runtime_hwparams(component, substream);
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if (ret)
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return ret;
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return snd_dmaengine_pcm_open(substream, chan);
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}
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static int dmaengine_pcm_close(struct snd_soc_component *component,
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struct snd_pcm_substream *substream)
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{
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return snd_dmaengine_pcm_close(substream);
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}
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static int dmaengine_pcm_trigger(struct snd_soc_component *component,
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struct snd_pcm_substream *substream, int cmd)
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{
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return snd_dmaengine_pcm_trigger(substream, cmd);
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}
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static struct dma_chan *dmaengine_pcm_compat_request_channel(
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struct snd_soc_component *component,
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struct snd_soc_pcm_runtime *rtd,
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struct snd_pcm_substream *substream)
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{
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struct dmaengine_pcm *pcm = soc_component_to_pcm(component);
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struct snd_dmaengine_dai_dma_data *dma_data;
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dma_filter_fn fn = NULL;
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if (rtd->num_cpus > 1) {
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dev_err(rtd->dev,
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"%s doesn't support Multi CPU yet\n", __func__);
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return NULL;
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}
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dma_data = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
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if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) && pcm->chan[0])
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return pcm->chan[0];
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if (pcm->config && pcm->config->compat_request_channel)
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return pcm->config->compat_request_channel(rtd, substream);
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if (pcm->config)
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fn = pcm->config->compat_filter_fn;
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return snd_dmaengine_pcm_request_channel(fn, dma_data->filter_data);
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}
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static bool dmaengine_pcm_can_report_residue(struct device *dev,
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struct dma_chan *chan)
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{
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struct dma_slave_caps dma_caps;
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int ret;
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ret = dma_get_slave_caps(chan, &dma_caps);
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if (ret != 0) {
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dev_warn(dev, "Failed to get DMA channel capabilities, falling back to period counting: %d\n",
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ret);
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return false;
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}
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if (dma_caps.residue_granularity == DMA_RESIDUE_GRANULARITY_DESCRIPTOR)
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return false;
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return true;
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}
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static int dmaengine_pcm_new(struct snd_soc_component *component,
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struct snd_soc_pcm_runtime *rtd)
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{
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struct dmaengine_pcm *pcm = soc_component_to_pcm(component);
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const struct snd_dmaengine_pcm_config *config = pcm->config;
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struct device *dev = component->dev;
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struct snd_pcm_substream *substream;
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size_t prealloc_buffer_size;
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size_t max_buffer_size;
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unsigned int i;
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if (config && config->prealloc_buffer_size) {
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prealloc_buffer_size = config->prealloc_buffer_size;
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max_buffer_size = config->pcm_hardware->buffer_bytes_max;
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} else {
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prealloc_buffer_size = 512 * 1024;
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max_buffer_size = SIZE_MAX;
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}
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for_each_pcm_streams(i) {
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substream = rtd->pcm->streams[i].substream;
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if (!substream)
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continue;
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if (!pcm->chan[i] && config && config->chan_names[i])
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pcm->chan[i] = dma_request_slave_channel(dev,
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config->chan_names[i]);
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if (!pcm->chan[i] && (pcm->flags & SND_DMAENGINE_PCM_FLAG_COMPAT)) {
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pcm->chan[i] = dmaengine_pcm_compat_request_channel(
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component, rtd, substream);
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}
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if (!pcm->chan[i]) {
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dev_err(component->dev,
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"Missing dma channel for stream: %d\n", i);
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return -EINVAL;
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}
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snd_pcm_set_managed_buffer(substream,
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SNDRV_DMA_TYPE_DEV_IRAM,
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dmaengine_dma_dev(pcm, substream),
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prealloc_buffer_size,
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max_buffer_size);
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if (!dmaengine_pcm_can_report_residue(dev, pcm->chan[i]))
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pcm->flags |= SND_DMAENGINE_PCM_FLAG_NO_RESIDUE;
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if (rtd->pcm->streams[i].pcm->name[0] == '\0') {
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strscpy_pad(rtd->pcm->streams[i].pcm->name,
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rtd->pcm->streams[i].pcm->id,
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sizeof(rtd->pcm->streams[i].pcm->name));
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}
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}
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return 0;
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}
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static snd_pcm_uframes_t dmaengine_pcm_pointer(
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struct snd_soc_component *component,
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struct snd_pcm_substream *substream)
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{
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struct dmaengine_pcm *pcm = soc_component_to_pcm(component);
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if (pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
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return snd_dmaengine_pcm_pointer_no_residue(substream);
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else
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return snd_dmaengine_pcm_pointer(substream);
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}
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static int dmaengine_copy_user(struct snd_soc_component *component,
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struct snd_pcm_substream *substream,
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int channel, unsigned long hwoff,
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void __user *buf, unsigned long bytes)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct dmaengine_pcm *pcm = soc_component_to_pcm(component);
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int (*process)(struct snd_pcm_substream *substream,
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int channel, unsigned long hwoff,
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void *buf, unsigned long bytes) = pcm->config->process;
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bool is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
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void *dma_ptr = runtime->dma_area + hwoff +
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channel * (runtime->dma_bytes / runtime->channels);
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int ret;
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if (is_playback)
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if (copy_from_user(dma_ptr, buf, bytes))
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return -EFAULT;
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if (process) {
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ret = process(substream, channel, hwoff, (__force void *)buf, bytes);
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if (ret < 0)
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return ret;
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}
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if (!is_playback)
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if (copy_to_user(buf, dma_ptr, bytes))
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return -EFAULT;
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return 0;
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}
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static const struct snd_soc_component_driver dmaengine_pcm_component = {
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.name = SND_DMAENGINE_PCM_DRV_NAME,
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.probe_order = SND_SOC_COMP_ORDER_LATE,
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.open = dmaengine_pcm_open,
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.close = dmaengine_pcm_close,
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.hw_params = dmaengine_pcm_hw_params,
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.trigger = dmaengine_pcm_trigger,
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.pointer = dmaengine_pcm_pointer,
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.pcm_construct = dmaengine_pcm_new,
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};
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static const struct snd_soc_component_driver dmaengine_pcm_component_process = {
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.name = SND_DMAENGINE_PCM_DRV_NAME,
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.probe_order = SND_SOC_COMP_ORDER_LATE,
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.open = dmaengine_pcm_open,
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.close = dmaengine_pcm_close,
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.hw_params = dmaengine_pcm_hw_params,
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.trigger = dmaengine_pcm_trigger,
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.pointer = dmaengine_pcm_pointer,
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.copy_user = dmaengine_copy_user,
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.pcm_construct = dmaengine_pcm_new,
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};
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static const char * const dmaengine_pcm_dma_channel_names[] = {
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[SNDRV_PCM_STREAM_PLAYBACK] = "tx",
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[SNDRV_PCM_STREAM_CAPTURE] = "rx",
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};
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static int dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
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struct device *dev, const struct snd_dmaengine_pcm_config *config)
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{
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unsigned int i;
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const char *name;
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struct dma_chan *chan;
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if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_DT) || (!dev->of_node &&
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!(config && config->dma_dev && config->dma_dev->of_node)))
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return 0;
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if (config && config->dma_dev) {
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/*
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* If this warning is seen, it probably means that your Linux
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* device structure does not match your HW device structure.
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* It would be best to refactor the Linux device structure to
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* correctly match the HW structure.
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*/
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dev_warn(dev, "DMA channels sourced from device %s",
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dev_name(config->dma_dev));
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dev = config->dma_dev;
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}
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for_each_pcm_streams(i) {
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if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
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name = "rx-tx";
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else
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name = dmaengine_pcm_dma_channel_names[i];
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if (config && config->chan_names[i])
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name = config->chan_names[i];
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chan = dma_request_chan(dev, name);
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if (IS_ERR(chan)) {
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/*
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* Only report probe deferral errors, channels
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* might not be present for devices that
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* support only TX or only RX.
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*/
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if (PTR_ERR(chan) == -EPROBE_DEFER)
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return -EPROBE_DEFER;
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pcm->chan[i] = NULL;
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} else {
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pcm->chan[i] = chan;
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}
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if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
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break;
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}
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if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
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pcm->chan[1] = pcm->chan[0];
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return 0;
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}
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static void dmaengine_pcm_release_chan(struct dmaengine_pcm *pcm)
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{
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unsigned int i;
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for_each_pcm_streams(i) {
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if (!pcm->chan[i])
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continue;
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dma_release_channel(pcm->chan[i]);
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if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
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break;
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}
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}
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/**
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* snd_dmaengine_pcm_register - Register a dmaengine based PCM device
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* @dev: The parent device for the PCM device
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* @config: Platform specific PCM configuration
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* @flags: Platform specific quirks
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*/
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int snd_dmaengine_pcm_register(struct device *dev,
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const struct snd_dmaengine_pcm_config *config, unsigned int flags)
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{
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const struct snd_soc_component_driver *driver;
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struct dmaengine_pcm *pcm;
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int ret;
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pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
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if (!pcm)
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return -ENOMEM;
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#ifdef CONFIG_DEBUG_FS
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pcm->component.debugfs_prefix = "dma";
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#endif
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pcm->config = config;
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pcm->flags = flags;
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ret = dmaengine_pcm_request_chan_of(pcm, dev, config);
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if (ret)
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goto err_free_dma;
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if (config && config->process)
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driver = &dmaengine_pcm_component_process;
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else
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driver = &dmaengine_pcm_component;
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ret = snd_soc_component_initialize(&pcm->component, driver, dev);
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if (ret)
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goto err_free_dma;
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ret = snd_soc_add_component(&pcm->component, NULL, 0);
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if (ret)
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goto err_free_dma;
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return 0;
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err_free_dma:
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dmaengine_pcm_release_chan(pcm);
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kfree(pcm);
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return ret;
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}
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EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_register);
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/**
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* snd_dmaengine_pcm_unregister - Removes a dmaengine based PCM device
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* @dev: Parent device the PCM was register with
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*
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* Removes a dmaengine based PCM device previously registered with
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* snd_dmaengine_pcm_register.
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*/
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void snd_dmaengine_pcm_unregister(struct device *dev)
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{
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struct snd_soc_component *component;
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struct dmaengine_pcm *pcm;
|
|
|
|
component = snd_soc_lookup_component(dev, SND_DMAENGINE_PCM_DRV_NAME);
|
|
if (!component)
|
|
return;
|
|
|
|
pcm = soc_component_to_pcm(component);
|
|
|
|
snd_soc_unregister_component_by_driver(dev, component->driver);
|
|
dmaengine_pcm_release_chan(pcm);
|
|
kfree(pcm);
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_unregister);
|
|
|
|
MODULE_LICENSE("GPL");
|