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7c1c1d4a7b
linux-next/sound/soc/ux500/ux500_pcm.c
Lars-Peter Clausen 7c1c1d4a7b ASoC: dmaengine-pcm: Make requesting the DMA channel at PCM open optional 
Refactor the dmaengine PCM library to allow the DMA channel to be requested
before opening a PCM substream. snd_dmaengine_pcm_open() now expects a DMA
channel instead of a filter function and filter parameter as its parameters.
snd_dmaengine_pcm_close() is updated to not release the DMA channel. This allows
a dmaengine based PCM driver to request its channels before the substream is
opened.

The patch also introduces two new functions, snd_dmaengine_pcm_open_request_chan()
and snd_dmaengine_pcm_close_release_chan(), which have the same signature and
behaviour of the old snd_dmaengine_pcm_{open,close}() and internally use the new
variants of these functions. All users of snd_dmaengine_pcm_{open,close}() are
updated to use snd_dmaengine_pcm_open_request_chan() and
snd_dmaengine_pcm_close_release_chan().

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Tested-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2013-04-17 14:17:54 +01:00

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/*
* Copyright (C) ST-Ericsson SA 2012
*
* Author: Ola Lilja <ola.o.lilja@stericsson.com>,
* Roger Nilsson <roger.xr.nilsson@stericsson.com>
* for ST-Ericsson.
*
* License terms:
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include <asm/page.h>
#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/slab.h>
#include <linux/platform_data/dma-ste-dma40.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/dmaengine_pcm.h>
#include "ux500_msp_i2s.h"
#include "ux500_pcm.h"
#define UX500_PLATFORM_MIN_RATE 8000
#define UX500_PLATFORM_MAX_RATE 48000
#define UX500_PLATFORM_MIN_CHANNELS 1
#define UX500_PLATFORM_MAX_CHANNELS 8
#define UX500_PLATFORM_PERIODS_BYTES_MIN 128
#define UX500_PLATFORM_PERIODS_BYTES_MAX (64 * PAGE_SIZE)
#define UX500_PLATFORM_PERIODS_MIN 2
#define UX500_PLATFORM_PERIODS_MAX 48
#define UX500_PLATFORM_BUFFER_BYTES_MAX (2048 * PAGE_SIZE)
static struct snd_pcm_hardware ux500_pcm_hw = {
.info = SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_RESUME |
SNDRV_PCM_INFO_PAUSE,
.formats = SNDRV_PCM_FMTBIT_S16_LE |
SNDRV_PCM_FMTBIT_U16_LE |
SNDRV_PCM_FMTBIT_S16_BE |
SNDRV_PCM_FMTBIT_U16_BE,
.rates = SNDRV_PCM_RATE_KNOT,
.rate_min = UX500_PLATFORM_MIN_RATE,
.rate_max = UX500_PLATFORM_MAX_RATE,
.channels_min = UX500_PLATFORM_MIN_CHANNELS,
.channels_max = UX500_PLATFORM_MAX_CHANNELS,
.buffer_bytes_max = UX500_PLATFORM_BUFFER_BYTES_MAX,
.period_bytes_min = UX500_PLATFORM_PERIODS_BYTES_MIN,
.period_bytes_max = UX500_PLATFORM_PERIODS_BYTES_MAX,
.periods_min = UX500_PLATFORM_PERIODS_MIN,
.periods_max = UX500_PLATFORM_PERIODS_MAX,
};
static void ux500_pcm_dma_hw_free(struct device *dev,
struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_dma_buffer *buf = runtime->dma_buffer_p;
if (runtime->dma_area == NULL)
return;
if (buf != &substream->dma_buffer) {
dma_free_coherent(buf->dev.dev, buf->bytes, buf->area,
buf->addr);
kfree(runtime->dma_buffer_p);
}
snd_pcm_set_runtime_buffer(substream, NULL);
}
static int ux500_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *dai = rtd->cpu_dai;
struct device *dev = dai->dev;
int ret;
struct ux500_msp_dma_params *dma_params;
u16 per_data_width, mem_data_width;
struct stedma40_chan_cfg *dma_cfg;
dev_dbg(dev, "%s: MSP %d (%s): Enter.\n", __func__, dai->id,
snd_pcm_stream_str(substream));
dev_dbg(dev, "%s: Set runtime hwparams.\n", __func__);
snd_soc_set_runtime_hwparams(substream, &ux500_pcm_hw);
mem_data_width = STEDMA40_HALFWORD_WIDTH;
dma_params = snd_soc_dai_get_dma_data(dai, substream);
switch (dma_params->data_size) {
case 32:
per_data_width = STEDMA40_WORD_WIDTH;
break;
case 16:
per_data_width = STEDMA40_HALFWORD_WIDTH;
break;
case 8:
per_data_width = STEDMA40_BYTE_WIDTH;
break;
default:
per_data_width = STEDMA40_WORD_WIDTH;
dev_warn(rtd->platform->dev,
"%s: Unknown data-size (%d)! Assuming 32 bits.\n",
__func__, dma_params->data_size);
}
dma_cfg = dma_params->dma_cfg;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
dma_cfg->src_info.data_width = mem_data_width;
dma_cfg->dst_info.data_width = per_data_width;
} else {
dma_cfg->src_info.data_width = per_data_width;
dma_cfg->dst_info.data_width = mem_data_width;
}
ret = snd_dmaengine_pcm_open_request_chan(substream, stedma40_filter,
dma_cfg);
if (ret) {
dev_dbg(dai->dev,
"%s: ERROR: snd_dmaengine_pcm_open failed (%d)!\n",
__func__, ret);
return ret;
}
return 0;
}
static int ux500_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_dma_buffer *buf = runtime->dma_buffer_p;
struct snd_soc_pcm_runtime *rtd = substream->private_data;
int ret = 0;
int size;
dev_dbg(rtd->platform->dev, "%s: Enter\n", __func__);
size = params_buffer_bytes(hw_params);
if (buf) {
if (buf->bytes >= size)
goto out;
ux500_pcm_dma_hw_free(NULL, substream);
}
if (substream->dma_buffer.area != NULL &&
substream->dma_buffer.bytes >= size) {
buf = &substream->dma_buffer;
} else {
buf = kmalloc(sizeof(struct snd_dma_buffer), GFP_KERNEL);
if (!buf)
goto nomem;
buf->dev.type = SNDRV_DMA_TYPE_DEV;
buf->dev.dev = NULL;
buf->area = dma_alloc_coherent(NULL, size, &buf->addr,
GFP_KERNEL);
buf->bytes = size;
buf->private_data = NULL;
if (!buf->area)
goto free;
}
snd_pcm_set_runtime_buffer(substream, buf);
ret = 1;
out:
runtime->dma_bytes = size;
return ret;
free:
kfree(buf);
nomem:
return -ENOMEM;
}
static int ux500_pcm_hw_free(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
dev_dbg(rtd->platform->dev, "%s: Enter\n", __func__);
ux500_pcm_dma_hw_free(NULL, substream);
return 0;
}
static int ux500_pcm_mmap(struct snd_pcm_substream *substream,
struct vm_area_struct *vma)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_soc_pcm_runtime *rtd = substream->private_data;
dev_dbg(rtd->platform->dev, "%s: Enter.\n", __func__);
return dma_mmap_coherent(NULL, vma, runtime->dma_area,
runtime->dma_addr, runtime->dma_bytes);
}
static struct snd_pcm_ops ux500_pcm_ops = {
.open = ux500_pcm_open,
.close = snd_dmaengine_pcm_close_release_chan,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = ux500_pcm_hw_params,
.hw_free = ux500_pcm_hw_free,
.trigger = snd_dmaengine_pcm_trigger,
.pointer = snd_dmaengine_pcm_pointer_no_residue,
.mmap = ux500_pcm_mmap
};
int ux500_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
struct snd_pcm *pcm = rtd->pcm;
dev_dbg(rtd->platform->dev, "%s: Enter (id = '%s').\n", __func__,
pcm->id);
pcm->info_flags = 0;
return 0;
}
static struct snd_soc_platform_driver ux500_pcm_soc_drv = {
.ops = &ux500_pcm_ops,
.pcm_new = ux500_pcm_new,
};
int ux500_pcm_register_platform(struct platform_device *pdev)
{
int ret;
ret = snd_soc_register_platform(&pdev->dev, &ux500_pcm_soc_drv);
if (ret < 0) {
dev_err(&pdev->dev,
"%s: ERROR: Failed to register platform '%s' (%d)!\n",
__func__, pdev->name, ret);
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(ux500_pcm_register_platform);
int ux500_pcm_unregister_platform(struct platform_device *pdev)
{
snd_soc_unregister_platform(&pdev->dev);
return 0;
}
EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);
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