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/*
* Copyright (C) 2013, Analog Devices Inc.
* Author: Lars-Peter Clausen <lars@metafoo.de>
*
* 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 <linux/module.h>
#include <linux/init.h>
#include <linux/dmaengine.h>
#include <linux/slab.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <linux/dma-mapping.h>
#include <linux/of.h>
#include <sound/dmaengine_pcm.h>
struct dmaengine_pcm {
struct dma_chan *chan[SNDRV_PCM_STREAM_LAST + 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);
}
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;
}
/**
* 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);
int (*prepare_slave_config)(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct dma_slave_config *slave_config);
struct dma_slave_config slave_config;
int ret;
memset(&slave_config, 0, sizeof(slave_config));
if (!pcm->config)
prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config;
else
prepare_slave_config = pcm->config->prepare_slave_config;
if (prepare_slave_config) {
ret = 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_set_runtime_hwparams(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 device *dma_dev = dmaengine_dma_dev(pcm, substream);
struct dma_chan *chan = pcm->chan[substream->stream];
struct snd_dmaengine_dai_dma_data *dma_data;
struct dma_slave_caps dma_caps;
struct snd_pcm_hardware hw;
u32 addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
int i, ret;
if (pcm->config && pcm->config->pcm_hardware)
return snd_soc_set_runtime_hwparams(substream,
pcm->config->pcm_hardware);
dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
memset(&hw, 0, sizeof(hw));
hw.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_INTERLEAVED;
hw.periods_min = 2;
hw.periods_max = UINT_MAX;
hw.period_bytes_min = 256;
hw.period_bytes_max = dma_get_max_seg_size(dma_dev);
hw.buffer_bytes_max = SIZE_MAX;
hw.fifo_size = dma_data->fifo_size;
if (pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
hw.info |= SNDRV_PCM_INFO_BATCH;
ret = dma_get_slave_caps(chan, &dma_caps);
if (ret == 0) {
if (dma_caps.cmd_pause)
hw.info |= SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME;
if (dma_caps.residue_granularity <= DMA_RESIDUE_GRANULARITY_SEGMENT)
hw.info |= SNDRV_PCM_INFO_BATCH;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
addr_widths = dma_caps.dst_addr_widths;
else
addr_widths = dma_caps.src_addr_widths;
}
/*
* Prepare formats mask for valid/allowed sample types. If the dma does
* not have support for the given physical word size, it needs to be
* masked out so user space can not use the format which produces
* corrupted audio.
* In case the dma driver does not implement the slave_caps the default
* assumption is that it supports 1, 2 and 4 bytes widths.
*/
for (i = 0; i <= SNDRV_PCM_FORMAT_LAST; i++) {
int bits = snd_pcm_format_physical_width(i);
/* Enable only samples with DMA supported physical widths */
switch (bits) {
case 8:
case 16:
case 24:
case 32:
case 64:
if (addr_widths & (1 << (bits / 8)))
hw.formats |= (1LL << i);
break;
default:
/* Unsupported types */
break;
}
}
return snd_soc_set_runtime_hwparams(substream, &hw);
}
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 = dmaengine_pcm_set_runtime_hwparams(substream);
if (ret)
return ret;
return snd_dmaengine_pcm_open(substream, chan);
}
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);
struct snd_dmaengine_dai_dma_data *dma_data;
dma_filter_fn fn = NULL;
dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) && pcm->chan[0])
return pcm->chan[0];
if (pcm->config && pcm->config->compat_request_channel)
return pcm->config->compat_request_channel(rtd, substream);
if (pcm->config)
fn = pcm->config->compat_filter_fn;
return snd_dmaengine_pcm_request_channel(fn, dma_data->filter_data);
}
static bool dmaengine_pcm_can_report_residue(struct dma_chan *chan)
{
struct dma_slave_caps dma_caps;
int ret;
ret = dma_get_slave_caps(chan, &dma_caps);
if (ret != 0)
return true;
if (dma_caps.residue_granularity == DMA_RESIDUE_GRANULARITY_DESCRIPTOR)
return false;
return true;
}
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 *
|