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