481 lines
13 KiB
C
481 lines
13 KiB
C
/*
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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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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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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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struct dmaengine_pcm {
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struct dma_chan *chan[SNDRV_PCM_STREAM_LAST + 1];
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const struct snd_dmaengine_pcm_config *config;
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struct snd_soc_platform platform;
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unsigned int flags;
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};
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static struct dmaengine_pcm *soc_platform_to_pcm(struct snd_soc_platform *p)
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{
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return container_of(p, struct dmaengine_pcm, platform);
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}
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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 = substream->private_data;
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struct snd_dmaengine_dai_dma_data *dma_data;
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int ret;
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dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, 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_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
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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 snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
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}
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static int dmaengine_pcm_set_runtime_hwparams(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
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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 dma_slave_caps dma_caps;
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struct snd_pcm_hardware hw;
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u32 addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
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BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
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BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
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int i, ret;
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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(rtd->cpu_dai, 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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ret = dma_get_slave_caps(chan, &dma_caps);
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if (ret == 0) {
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if (dma_caps.cmd_pause)
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hw.info |= SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME;
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if (dma_caps.residue_granularity <= DMA_RESIDUE_GRANULARITY_SEGMENT)
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hw.info |= SNDRV_PCM_INFO_BATCH;
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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addr_widths = dma_caps.dst_addr_widths;
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else
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addr_widths = dma_caps.src_addr_widths;
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}
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/*
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* If SND_DMAENGINE_PCM_DAI_FLAG_PACK is set keep
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* hw.formats set to 0, meaning no restrictions are in place.
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* In this case it's the responsibility of the DAI driver to
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* provide the supported format information.
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*/
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if (!(dma_data->flags & SND_DMAENGINE_PCM_DAI_FLAG_PACK))
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/*
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* Prepare formats mask for valid/allowed sample types. If the
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* dma does not have support for the given physical word size,
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* it needs to be masked out so user space can not use the
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* format which produces corrupted audio.
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* In case the dma driver does not implement the slave_caps the
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* default assumption is that it supports 1, 2 and 4 bytes
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* widths.
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*/
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for (i = 0; i <= SNDRV_PCM_FORMAT_LAST; i++) {
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int bits = snd_pcm_format_physical_width(i);
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/*
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* Enable only samples with DMA supported physical
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* widths
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*/
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switch (bits) {
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case 8:
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case 16:
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case 24:
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case 32:
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case 64:
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if (addr_widths & (1 << (bits / 8)))
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hw.formats |= (1LL << i);
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break;
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default:
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/* Unsupported types */
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break;
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}
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}
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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_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
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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(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 struct dma_chan *dmaengine_pcm_compat_request_channel(
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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_platform_to_pcm(rtd->platform);
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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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dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, 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_pcm_runtime *rtd)
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{
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struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
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const struct snd_dmaengine_pcm_config *config = pcm->config;
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struct device *dev = rtd->platform->dev;
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struct snd_dmaengine_dai_dma_data *dma_data;
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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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int ret;
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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 (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; 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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dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
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if (!pcm->chan[i] &&
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(pcm->flags & SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME))
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pcm->chan[i] = dma_request_slave_channel(dev,
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dma_data->chan_name);
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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(rtd,
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substream);
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}
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if (!pcm->chan[i]) {
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dev_err(rtd->platform->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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ret = snd_pcm_lib_preallocate_pages(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 (ret)
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return ret;
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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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}
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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_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
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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 const struct snd_pcm_ops dmaengine_pcm_ops = {
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.open = dmaengine_pcm_open,
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.close = snd_dmaengine_pcm_close,
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.ioctl = snd_pcm_lib_ioctl,
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.hw_params = dmaengine_pcm_hw_params,
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.hw_free = snd_pcm_lib_free_pages,
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.trigger = snd_dmaengine_pcm_trigger,
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.pointer = dmaengine_pcm_pointer,
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};
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static const struct snd_soc_platform_driver dmaengine_pcm_platform = {
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.component_driver = {
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.probe_order = SND_SOC_COMP_ORDER_LATE,
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},
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.ops = &dmaengine_pcm_ops,
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.pcm_new = 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 |
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SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME)) ||
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!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 (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE;
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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_slave_channel_reason(dev, name);
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if (IS_ERR(chan)) {
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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 (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE;
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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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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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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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ret = snd_soc_add_platform(dev, &pcm->platform,
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&dmaengine_pcm_platform);
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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_platform *platform;
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struct dmaengine_pcm *pcm;
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platform = snd_soc_lookup_platform(dev);
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if (!platform)
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return;
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pcm = soc_platform_to_pcm(platform);
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snd_soc_remove_platform(platform);
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dmaengine_pcm_release_chan(pcm);
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kfree(pcm);
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}
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EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_unregister);
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MODULE_LICENSE("GPL");
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