ASoC: atmel-pcm: dma support based on pcm dmaengine

Specify overrun bit in interrupt mask
Add dmaengine specific routines

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
[voice.shen@atmel.com: adapt to soc dmaengine framework]
Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Bo Shen 2012-11-28 11:46:13 +08:00 committed by Mark Brown
parent 92dfa61986
commit 3951e4aae2
5 changed files with 276 additions and 2 deletions

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@ -10,6 +10,10 @@ config SND_ATMEL_SOC_PDC
tristate
depends on SND_ATMEL_SOC
config SND_ATMEL_SOC_DMA
tristate
depends on SND_ATMEL_SOC
config SND_ATMEL_SOC_SSC
tristate
depends on SND_ATMEL_SOC
@ -31,6 +35,7 @@ config SND_AT91_SOC_SAM9G20_WM8731
config SND_AT91_SOC_AFEB9260
tristate "SoC Audio support for AFEB9260 board"
depends on ATMEL_SSC && ARCH_AT91 && MACH_AFEB9260 && SND_ATMEL_SOC
select SND_ATMEL_SOC_PDC
select SND_ATMEL_SOC_SSC
select SND_SOC_TLV320AIC23
help

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@ -1,10 +1,12 @@
# AT91 Platform Support
snd-soc-atmel-pcm-objs := atmel-pcm.o
snd-soc-atmel-pcm-pdc-objs := atmel-pcm-pdc.o
snd-soc-atmel-pcm-dma-objs := atmel-pcm-dma.o
snd-soc-atmel_ssc_dai-objs := atmel_ssc_dai.o
obj-$(CONFIG_SND_ATMEL_SOC) += snd-soc-atmel-pcm.o
obj-$(CONFIG_SND_ATMEL_SOC_PDC) += snd-soc-atmel-pcm-pdc.o
obj-$(CONFIG_SND_ATMEL_SOC_DMA) += snd-soc-atmel-pcm-dma.o
obj-$(CONFIG_SND_ATMEL_SOC_SSC) += snd-soc-atmel_ssc_dai.o
# AT91 Machine Support

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@ -0,0 +1,240 @@
/*
* atmel-pcm-dma.c -- ALSA PCM DMA support for the Atmel SoC.
*
* Copyright (C) 2012 Atmel
*
* Author: Bo Shen <voice.shen@atmel.com>
*
* Based on atmel-pcm by:
* Sedji Gaouaou <sedji.gaouaou@atmel.com>
* Copyright 2008 Atmel
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/atmel-ssc.h>
#include <linux/platform_data/dma-atmel.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/dmaengine_pcm.h>
#include "atmel-pcm.h"
/*--------------------------------------------------------------------------*\
* Hardware definition
\*--------------------------------------------------------------------------*/
static const struct snd_pcm_hardware atmel_pcm_dma_hardware = {
.info = SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_RESUME |
SNDRV_PCM_INFO_PAUSE,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
.period_bytes_min = 256, /* lighting DMA overhead */
.period_bytes_max = 2 * 0xffff, /* if 2 bytes format */
.periods_min = 8,
.periods_max = 1024, /* no limit */
.buffer_bytes_max = ATMEL_SSC_DMABUF_SIZE,
};
/**
* atmel_pcm_dma_irq: SSC interrupt handler for DMAENGINE enabled SSC
*
* We use DMAENGINE to send/receive data to/from SSC so this ISR is only to
* check if any overrun occured.
*/
static void atmel_pcm_dma_irq(u32 ssc_sr,
struct snd_pcm_substream *substream)
{
struct atmel_pcm_dma_params *prtd;
prtd = snd_dmaengine_pcm_get_data(substream);
if (ssc_sr & prtd->mask->ssc_error) {
if (snd_pcm_running(substream))
pr_warn("atmel-pcm: buffer %s on %s (SSC_SR=%#x)\n",
substream->stream == SNDRV_PCM_STREAM_PLAYBACK
? "underrun" : "overrun", prtd->name,
ssc_sr);
/* stop RX and capture: will be enabled again at restart */
ssc_writex(prtd->ssc->regs, SSC_CR, prtd->mask->ssc_disable);
snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
/* now drain RHR and read status to remove xrun condition */
ssc_readx(prtd->ssc->regs, SSC_RHR);
ssc_readx(prtd->ssc->regs, SSC_SR);
}
}
/*--------------------------------------------------------------------------*\
* DMAENGINE operations
\*--------------------------------------------------------------------------*/
static bool filter(struct dma_chan *chan, void *slave)
{
struct at_dma_slave *sl = slave;
if (sl->dma_dev == chan->device->dev) {
chan->private = sl;
return true;
} else {
return false;
}
}
static int atmel_pcm_configure_dma(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct atmel_pcm_dma_params *prtd;
struct ssc_device *ssc;
struct dma_chan *dma_chan;
struct dma_slave_config slave_config;
int ret;
prtd = snd_dmaengine_pcm_get_data(substream);
ssc = prtd->ssc;
ret = snd_hwparams_to_dma_slave_config(substream, params,
&slave_config);
if (ret) {
pr_err("atmel-pcm: hwparams to dma slave configure failed\n");
return ret;
}
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
slave_config.dst_addr = (dma_addr_t)ssc->phybase + SSC_THR;
slave_config.dst_maxburst = 1;
} else {
slave_config.src_addr = (dma_addr_t)ssc->phybase + SSC_RHR;
slave_config.src_maxburst = 1;
}
slave_config.device_fc = false;
dma_chan = snd_dmaengine_pcm_get_chan(substream);
if (dmaengine_slave_config(dma_chan, &slave_config)) {
pr_err("atmel-pcm: failed to configure dma channel\n");
ret = -EBUSY;
return ret;
}
return 0;
}
static int atmel_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct atmel_pcm_dma_params *prtd;
struct ssc_device *ssc;
struct at_dma_slave *sdata = NULL;
int ret;
snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
prtd = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
ssc = prtd->ssc;
if (ssc->pdev)
sdata = ssc->pdev->dev.platform_data;
ret = snd_dmaengine_pcm_open(substream, filter, sdata);
if (ret) {
pr_err("atmel-pcm: dmaengine pcm open failed\n");
return -EINVAL;
}
snd_dmaengine_pcm_set_data(substream, prtd);
ret = atmel_pcm_configure_dma(substream, params);
if (ret) {
pr_err("atmel-pcm: failed to configure dmai\n");
goto err;
}
prtd->dma_intr_handler = atmel_pcm_dma_irq;
return 0;
err:
snd_dmaengine_pcm_close(substream);
return ret;
}
static int atmel_pcm_dma_prepare(struct snd_pcm_substream *substream)
{
struct atmel_pcm_dma_params *prtd;
prtd = snd_dmaengine_pcm_get_data(substream);
ssc_writex(prtd->ssc->regs, SSC_IER, prtd->mask->ssc_error);
ssc_writex(prtd->ssc->regs, SSC_CR, prtd->mask->ssc_enable);
return 0;
}
static int atmel_pcm_open(struct snd_pcm_substream *substream)
{
snd_soc_set_runtime_hwparams(substream, &atmel_pcm_dma_hardware);
return 0;
}
static int atmel_pcm_close(struct snd_pcm_substream *substream)
{
snd_dmaengine_pcm_close(substream);
return 0;
}
static struct snd_pcm_ops atmel_pcm_ops = {
.open = atmel_pcm_open,
.close = atmel_pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = atmel_pcm_hw_params,
.prepare = atmel_pcm_dma_prepare,
.trigger = snd_dmaengine_pcm_trigger,
.pointer = snd_dmaengine_pcm_pointer_no_residue,
.mmap = atmel_pcm_mmap,
};
static struct snd_soc_platform_driver atmel_soc_platform = {
.ops = &atmel_pcm_ops,
.pcm_new = atmel_pcm_new,
.pcm_free = atmel_pcm_free,
};
int atmel_pcm_dma_platform_register(struct device *dev)
{
return snd_soc_register_platform(dev, &atmel_soc_platform);
}
EXPORT_SYMBOL(atmel_pcm_dma_platform_register);
void atmel_pcm_dma_platform_unregister(struct device *dev)
{
snd_soc_unregister_platform(dev);
}
EXPORT_SYMBOL(atmel_pcm_dma_platform_unregister);
MODULE_AUTHOR("Bo Shen <voice.shen@atmel.com>");
MODULE_DESCRIPTION("Atmel DMA based PCM module");
MODULE_LICENSE("GPL");

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@ -52,6 +52,7 @@ struct atmel_pdc_regs {
struct atmel_ssc_mask {
u32 ssc_enable; /* SSC recv/trans enable */
u32 ssc_disable; /* SSC recv/trans disable */
u32 ssc_error; /* SSC error conditions */
u32 ssc_endx; /* SSC ENDTX or ENDRX */
u32 ssc_endbuf; /* SSC TXBUFE or RXBUFF */
u32 pdc_enable; /* PDC recv/trans enable */
@ -100,4 +101,17 @@ static inline void atmel_pcm_pdc_platform_unregister(struct device *dev)
}
#endif
#ifdef CONFIG_SND_ATMEL_SOC_DMA
int atmel_pcm_dma_platform_register(struct device *dev);
void atmel_pcm_dma_platform_unregister(struct device *dev);
#else
static inline int atmel_pcm_dma_platform_register(struct device *dev)
{
return 0;
}
static inline void atmel_pcm_dma_platform_unregister(struct device *dev)
{
}
#endif
#endif /* _ATMEL_PCM_H */

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@ -721,6 +721,8 @@ static struct snd_soc_dai_driver atmel_ssc_dai = {
static int asoc_ssc_init(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct ssc_device *ssc = platform_get_drvdata(pdev);
int ret;
ret = snd_soc_register_dai(dev, &atmel_ssc_dai);
@ -729,7 +731,11 @@ static int asoc_ssc_init(struct device *dev)
goto err;
}
ret = atmel_pcm_pdc_platform_register(dev);
if (ssc->pdata->use_dma)
ret = atmel_pcm_dma_platform_register(dev);
else
ret = atmel_pcm_pdc_platform_register(dev);
if (ret) {
dev_err(dev, "Could not register PCM: %d\n", ret);
goto err_unregister_dai;
@ -745,7 +751,14 @@ err:
static void asoc_ssc_exit(struct device *dev)
{
atmel_pcm_pdc_platform_unregister(dev);
struct platform_device *pdev = to_platform_device(dev);
struct ssc_device *ssc = platform_get_drvdata(pdev);
if (ssc->pdata->use_dma)
atmel_pcm_dma_platform_unregister(dev);
else
atmel_pcm_pdc_platform_unregister(dev);
snd_soc_unregister_dai(dev);
}