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// SPDX-License-Identifier: GPL-2.0-only
/*
* tegra_pcm.c - Tegra PCM driver
*
* Author: Stephen Warren <swarren@nvidia.com>
* Copyright (C) 2010,2012 - NVIDIA, Inc.
*
* Based on code copyright/by:
*
* Copyright (c) 2009-2010, NVIDIA Corporation.
* Scott Peterson <speterson@nvidia.com>
* Vijay Mali <vmali@nvidia.com>
*
* Copyright (C) 2010 Google, Inc.
* Iliyan Malchev <malchev@google.com>
*/
#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/dmaengine_pcm.h>
#include "tegra_pcm.h"
static const struct snd_pcm_hardware tegra_pcm_hardware = {
.info = SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_INTERLEAVED,
.period_bytes_min = 1024,
.period_bytes_max = PAGE_SIZE,
.periods_min = 2,
.periods_max = 8,
.buffer_bytes_max = PAGE_SIZE * 8,
.fifo_size = 4,
};
static const struct snd_dmaengine_pcm_config tegra_dmaengine_pcm_config = {
.pcm_hardware = &tegra_pcm_hardware,
.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
.prealloc_buffer_size = PAGE_SIZE * 8,
};
int tegra_pcm_platform_register(struct device *dev)
{
return snd_dmaengine_pcm_register(dev, &tegra_dmaengine_pcm_config, 0);
}
EXPORT_SYMBOL_GPL(tegra_pcm_platform_register);
int tegra_pcm_platform_register_with_chan_names(struct device *dev,
struct snd_dmaengine_pcm_config *config,
char *txdmachan, char *rxdmachan)
{
*config = tegra_dmaengine_pcm_config;
config->dma_dev = dev->parent;
config->chan_names[0] = txdmachan;
config->chan_names[1] = rxdmachan;
return snd_dmaengine_pcm_register(dev, config, 0);
}
EXPORT_SYMBOL_GPL(tegra_pcm_platform_register_with_chan_names);
void tegra_pcm_platform_unregister(struct device *dev)
{
return snd_dmaengine_pcm_unregister(dev);
}
EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister);
int tegra_pcm_open(struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_dmaengine_dai_dma_data *dmap;
struct dma_chan *chan;
struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
int ret;
if (rtd->dai_link->no_pcm)
return 0;
dmap = snd_soc_dai_get_dma_data(cpu_dai, substream);
/* Set HW params now that initialization is complete */
snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware);
/* Ensure period size is multiple of 8 */
ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 0x8);
if (ret) {
dev_err(rtd->dev, "failed to set constraint %d\n", ret);
return ret;
}
chan = dma_request_slave_channel(cpu_dai->dev, dmap->chan_name);
if (!chan) {
dev_err(cpu_dai->dev,
"dmaengine request slave channel failed! (%s)\n",
dmap->chan_name);
return -ENODEV;
}
ret = snd_dmaengine_pcm_open(substream, chan);
if (ret) {
dev_err(rtd->dev,
"dmaengine pcm open failed with err %d (%s)\n", ret,
dmap->chan_name);
dma_release_channel(chan);
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(tegra_pcm_open);
int tegra_pcm_close(struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
if (rtd->dai_link->no_pcm)
return 0;
snd_dmaengine_pcm_close_release_chan(substream);
return 0;
}
EXPORT_SYMBOL_GPL(tegra_pcm_close);
int tegra_pcm_hw_params(struct snd_soc_component *component,
struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_dmaengine_dai_dma_data *dmap;
struct dma_slave_config slave_config;
struct dma_chan *chan;
int ret;
if (rtd->dai_link->no_pcm)
return 0;
dmap = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
if (!dmap)
return 0;
chan = snd_dmaengine_pcm_get_chan(substream);
ret = snd_hwparams_to_dma_slave_config(substream, params,
&slave_config);
if (ret) {
dev_err(rtd->dev, "hw params config failed with err %d\n", ret);
return ret;
}
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
slave_config.dst_addr = dmap->addr;
slave_config.dst_maxburst = 8;
} else {
slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
slave_config.src_addr = dmap->addr;
slave_config.src_maxburst = 8;
}
ret = dmaengine_slave_config(chan, &slave_config);
if (ret < 0) {
dev_err(rtd->dev, "dma slave config failed with err %d\n", ret);
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(tegra_pcm_hw_params);
snd_pcm_uframes_t tegra_pcm_pointer(struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
return snd_dmaengine_pcm_pointer(substream);
}
EXPORT_SYMBOL_GPL(tegra_pcm_pointer);
static int tegra_pcm_dma_allocate(struct device *dev, struct snd_soc_pcm_runtime *rtd,
size_t size)
{
struct snd_pcm *pcm = rtd->pcm;
int ret;
ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
if (ret < 0)
return ret;
return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_WC, dev, size);
}
int tegra_pcm_construct(struct snd_soc_component *component,
struct snd_soc_pcm_runtime *rtd)
{
struct device *dev = component->dev;
/*
* Fallback for backwards-compatibility with older device trees that
* have the iommus property in the virtual, top-level "sound" node.
*/
if (!of_get_property(dev->of_node, "iommus", NULL))
dev = rtd->card->snd_card->dev;
return tegra_pcm_dma_allocate(dev, rtd, tegra_pcm_hardware.buffer_bytes_max);
}
EXPORT_SYMBOL_GPL(tegra_pcm_construct);
MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
MODULE_DESCRIPTION("Tegra PCM ASoC driver");
MODULE_LICENSE("GPL");
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