mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 10:40:15 +02:00
ASoC: Add dmaengine PCM helper functions
This patch adds a set of functions which are intended to be used when implementing a dmaengine based sound PCM driver. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Tested-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Vinod Koul <vinod.koul@linux.intel.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Lars-Peter Clausen
Mark Brown
parent
1355ab147f
commit
e7f73a1613
4 changed files with 342 additions and 0 deletions
49
include/sound/dmaengine_pcm.h
Normal file
49
include/sound/dmaengine_pcm.h
Normal file
|
|
@ -0,0 +1,49 @@
|
|||
/*
|
||||
* Copyright (C) 2012, 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.
|
||||
*
|
||||
*/
|
||||
#ifndef __SOUND_DMAENGINE_PCM_H__
|
||||
#define __SOUND_DMAENGINE_PCM_H__
|
||||
|
||||
#include <sound/pcm.h>
|
||||
#include <linux/dmaengine.h>
|
||||
|
||||
/**
|
||||
* snd_pcm_substream_to_dma_direction - Get dma_transfer_direction for a PCM
|
||||
* substream
|
||||
* @substream: PCM substream
|
||||
*/
|
||||
static inline enum dma_transfer_direction
|
||||
snd_pcm_substream_to_dma_direction(const struct snd_pcm_substream *substream)
|
||||
{
|
||||
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
|
||||
return DMA_MEM_TO_DEV;
|
||||
else
|
||||
return DMA_DEV_TO_MEM;
|
||||
}
|
||||
|
||||
void snd_dmaengine_pcm_set_data(struct snd_pcm_substream *substream, void *data);
|
||||
void *snd_dmaengine_pcm_get_data(struct snd_pcm_substream *substream);
|
||||
|
||||
int snd_hwparams_to_dma_slave_config(const struct snd_pcm_substream *substream,
|
||||
const struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config);
|
||||
int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd);
|
||||
snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream);
|
||||
|
||||
int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream,
|
||||
dma_filter_fn filter_fn, void *filter_data);
|
||||
int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream);
|
||||
|
||||
struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream);
|
||||
|
||||
#endif
|
||||
|
|
@ -25,6 +25,9 @@ if SND_SOC
|
|||
config SND_SOC_AC97_BUS
|
||||
bool
|
||||
|
||||
config SND_SOC_DMAENGINE_PCM
|
||||
bool
|
||||
|
||||
# All the supported SoCs
|
||||
source "sound/soc/atmel/Kconfig"
|
||||
source "sound/soc/au1x/Kconfig"
|
||||
|
|
|
|||
|
|
@ -1,6 +1,9 @@
|
|||
snd-soc-core-objs := soc-core.o soc-dapm.o soc-jack.o soc-cache.o soc-utils.o
|
||||
snd-soc-core-objs += soc-pcm.o soc-io.o
|
||||
|
||||
snd-soc-dmaengine-pcm-objs := soc-dmaengine-pcm.o
|
||||
obj-$(CONFIG_SND_SOC_DMAENGINE_PCM) += snd-soc-dmaengine-pcm.o
|
||||
|
||||
obj-$(CONFIG_SND_SOC) += snd-soc-core.o
|
||||
obj-$(CONFIG_SND_SOC) += codecs/
|
||||
obj-$(CONFIG_SND_SOC) += atmel/
|
||||
|
|
|
|||
287
sound/soc/soc-dmaengine-pcm.c
Normal file
287
sound/soc/soc-dmaengine-pcm.c
Normal file
|
|
@ -0,0 +1,287 @@
|
|||
/*
|
||||
* Copyright (C) 2012, Analog Devices Inc.
|
||||
* Author: Lars-Peter Clausen <lars@metafoo.de>
|
||||
*
|
||||
* Based on:
|
||||
* imx-pcm-dma-mx2.c, Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
|
||||
* mxs-pcm.c, Copyright (C) 2011 Freescale Semiconductor, Inc.
|
||||
* ep93xx-pcm.c, Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
|
||||
* Copyright (C) 2006 Applied Data Systems
|
||||
*
|
||||
* 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 <sound/dmaengine_pcm.h>
|
||||
|
||||
struct dmaengine_pcm_runtime_data {
|
||||
struct dma_chan *dma_chan;
|
||||
|
||||
unsigned int pos;
|
||||
|
||||
void *data;
|
||||
};
|
||||
|
||||
static inline struct dmaengine_pcm_runtime_data *substream_to_prtd(
|
||||
const struct snd_pcm_substream *substream)
|
||||
{
|
||||
return substream->runtime->private_data;
|
||||
}
|
||||
|
||||
/**
|
||||
* snd_dmaengine_pcm_set_data - Set dmaengine substream private data
|
||||
* @substream: PCM substream
|
||||
* @data: Data to set
|
||||
*/
|
||||
void snd_dmaengine_pcm_set_data(struct snd_pcm_substream *substream, void *data)
|
||||
{
|
||||
struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
|
||||
|
||||
prtd->data = data;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_set_data);
|
||||
|
||||
/**
|
||||
* snd_dmaengine_pcm_get_data - Get dmaeinge substream private data
|
||||
* @substream: PCM substream
|
||||
*
|
||||
* Returns the data previously set with snd_dmaengine_pcm_set_data
|
||||
*/
|
||||
void *snd_dmaengine_pcm_get_data(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
|
||||
|
||||
return prtd->data;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_get_data);
|
||||
|
||||
struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
|
||||
|
||||
return prtd->dma_chan;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_get_chan);
|
||||
|
||||
/**
|
||||
* snd_hwparams_to_dma_slave_config - Convert hw_params to dma_slave_config
|
||||
* @substream: PCM substream
|
||||
* @params: hw_params
|
||||
* @slave_config: DMA slave config
|
||||
*
|
||||
* This function can be used to initialize a dma_slave_config from a substream
|
||||
* and hw_params in a dmaengine based PCM driver implementation.
|
||||
*/
|
||||
int snd_hwparams_to_dma_slave_config(const struct snd_pcm_substream *substream,
|
||||
const struct snd_pcm_hw_params *params,
|
||||
struct dma_slave_config *slave_config)
|
||||
{
|
||||
enum dma_slave_buswidth buswidth;
|
||||
|
||||
switch (params_format(params)) {
|
||||
case SNDRV_PCM_FORMAT_S8:
|
||||
buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
|
||||
break;
|
||||
case SNDRV_PCM_FORMAT_S16_LE:
|
||||
buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
|
||||
break;
|
||||
case SNDRV_PCM_FORMAT_S18_3LE:
|
||||
case SNDRV_PCM_FORMAT_S20_3LE:
|
||||
case SNDRV_PCM_FORMAT_S24_LE:
|
||||
case SNDRV_PCM_FORMAT_S32_LE:
|
||||
buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
|
||||
slave_config->direction = DMA_MEM_TO_DEV;
|
||||
slave_config->dst_addr_width = buswidth;
|
||||
} else {
|
||||
slave_config->direction = DMA_DEV_TO_MEM;
|
||||
slave_config->src_addr_width = buswidth;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(snd_hwparams_to_dma_slave_config);
|
||||
|
||||
static void dmaengine_pcm_dma_complete(void *arg)
|
||||
{
|
||||
struct snd_pcm_substream *substream = arg;
|
||||
struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
|
||||
|
||||
prtd->pos += snd_pcm_lib_period_bytes(substream);
|
||||
if (prtd->pos >= snd_pcm_lib_buffer_bytes(substream))
|
||||
prtd->pos = 0;
|
||||
|
||||
snd_pcm_period_elapsed(substream);
|
||||
}
|
||||
|
||||
static int dmaengine_pcm_prepare_and_submit(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
|
||||
struct dma_chan *chan = prtd->dma_chan;
|
||||
struct dma_async_tx_descriptor *desc;
|
||||
enum dma_transfer_direction direction;
|
||||
|
||||
direction = snd_pcm_substream_to_dma_direction(substream);
|
||||
|
||||
desc = chan->device->device_prep_dma_cyclic(chan,
|
||||
substream->runtime->dma_addr,
|
||||
snd_pcm_lib_buffer_bytes(substream),
|
||||
snd_pcm_lib_period_bytes(substream), direction);
|
||||
|
||||
if (!desc)
|
||||
return -ENOMEM;
|
||||
|
||||
desc->callback = dmaengine_pcm_dma_complete;
|
||||
desc->callback_param = substream;
|
||||
dmaengine_submit(desc);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* snd_dmaengine_pcm_trigger - dmaengine based PCM trigger implementation
|
||||
* @substream: PCM substream
|
||||
* @cmd: Trigger command
|
||||
*
|
||||
* Returns 0 on success, a negative error code otherwise.
|
||||
*
|
||||
* This function can be used as the PCM trigger callback for dmaengine based PCM
|
||||
* driver implementations.
|
||||
*/
|
||||
int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
|
||||
{
|
||||
struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
|
||||
int ret;
|
||||
|
||||
switch (cmd) {
|
||||
case SNDRV_PCM_TRIGGER_START:
|
||||
ret = dmaengine_pcm_prepare_and_submit(substream);
|
||||
if (ret)
|
||||
return ret;
|
||||
dma_async_issue_pending(prtd->dma_chan);
|
||||
break;
|
||||
case SNDRV_PCM_TRIGGER_RESUME:
|
||||
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
|
||||
dmaengine_resume(prtd->dma_chan);
|
||||
break;
|
||||
case SNDRV_PCM_TRIGGER_SUSPEND:
|
||||
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
|
||||
dmaengine_pause(prtd->dma_chan);
|
||||
break;
|
||||
case SNDRV_PCM_TRIGGER_STOP:
|
||||
dmaengine_terminate_all(prtd->dma_chan);
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_trigger);
|
||||
|
||||
/**
|
||||
* snd_dmaengine_pcm_pointer - dmaengine based PCM pointer implementation
|
||||
* @substream: PCM substream
|
||||
*
|
||||
* This function can be used as the PCM pointer callback for dmaengine based PCM
|
||||
* driver implementations.
|
||||
*/
|
||||
snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
|
||||
return bytes_to_frames(substream->runtime, prtd->pos);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_pointer);
|
||||
|
||||
static int dmaengine_pcm_request_channel(struct dmaengine_pcm_runtime_data *prtd,
|
||||
dma_filter_fn filter_fn, void *filter_data)
|
||||
{
|
||||
dma_cap_mask_t mask;
|
||||
|
||||
dma_cap_zero(mask);
|
||||
dma_cap_set(DMA_SLAVE, mask);
|
||||
dma_cap_set(DMA_CYCLIC, mask);
|
||||
prtd->dma_chan = dma_request_channel(mask, filter_fn, filter_data);
|
||||
|
||||
if (!prtd->dma_chan)
|
||||
return -ENXIO;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* snd_dmaengine_pcm_open - Open a dmaengine based PCM substream
|
||||
* @substream: PCM substream
|
||||
* @filter_fn: Filter function used to request the DMA channel
|
||||
* @filter_data: Data passed to the DMA filter function
|
||||
*
|
||||
* Returns 0 on success, a negative error code otherwise.
|
||||
*
|
||||
* This function will request a DMA channel using the passed filter function and
|
||||
* data. The function should usually be called from the pcm open callback.
|
||||
*
|
||||
* Note that this function will use private_data field of the substream's
|
||||
* runtime. So it is not availabe to your pcm driver implementation. If you need
|
||||
* to keep additional data attached to a substream use
|
||||
* snd_dmaeinge_pcm_{set,get}_data.
|
||||
*/
|
||||
int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream,
|
||||
dma_filter_fn filter_fn, void *filter_data)
|
||||
{
|
||||
struct dmaengine_pcm_runtime_data *prtd;
|
||||
int ret;
|
||||
|
||||
ret = snd_pcm_hw_constraint_integer(substream->runtime,
|
||||
SNDRV_PCM_HW_PARAM_PERIODS);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
prtd = kzalloc(sizeof(*prtd), GFP_KERNEL);
|
||||
if (!prtd)
|
||||
return -ENOMEM;
|
||||
|
||||
ret = dmaengine_pcm_request_channel(prtd, filter_fn, filter_data);
|
||||
if (ret < 0) {
|
||||
kfree(prtd);
|
||||
return ret;
|
||||
}
|
||||
|
||||
substream->runtime->private_data = prtd;
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open);
|
||||
|
||||
/**
|
||||
* snd_dmaengine_pcm_close - Close a dmaengine based PCM substream
|
||||
* @substream: PCM substream
|
||||
*/
|
||||
int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
|
||||
|
||||
dma_release_channel(prtd->dma_chan);
|
||||
kfree(prtd);
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close);
|
||||
Loading…
Reference in a new issue