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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) ST-Ericsson SA 2012
*
* Author: Ola Lilja <ola.o.lilja@stericsson.com>,
* Roger Nilsson <roger.xr.nilsson@stericsson.com>
* for ST-Ericsson.
*/
#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_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 dma_chan *ux500_pcm_request_chan(struct snd_soc_pcm_runtime *rtd,
struct snd_pcm_substream *substream)
{
struct snd_soc_dai *dai = asoc_rtd_to_cpu(rtd, 0);
u16 per_data_width, mem_data_width;
struct stedma40_chan_cfg *dma_cfg;
struct ux500_msp_dma_params *dma_params;
dma_params = snd_soc_dai_get_dma_data(dai, substream);
dma_cfg = dma_params->dma_cfg;
mem_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
switch (dma_params->data_size) {
case 32:
per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
break;
case 16:
per_data_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
break;
case 8:
per_data_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
break;
default:
per_data_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
}
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;
}
return snd_dmaengine_pcm_request_channel(stedma40_filter, dma_cfg);
}
static int ux500_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct dma_slave_config *slave_config)
{
struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
struct snd_dmaengine_dai_dma_data *snd_dma_params;
dma_addr_t dma_addr;
int ret;
snd_dma_params = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
dma_addr = snd_dma_params->addr;
ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
if (ret)
return ret;
slave_config->dst_maxburst = 4;
slave_config->src_maxburst = 4;
slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
slave_config->dst_addr = dma_addr;
else
slave_config->src_addr = dma_addr;
return 0;
}
static const struct snd_dmaengine_pcm_config ux500_dmaengine_of_pcm_config = {
.compat_request_channel = ux500_pcm_request_chan,
.prepare_slave_config = ux500_pcm_prepare_slave_config,
};
int ux500_pcm_register_platform(struct platform_device *pdev)
{
int ret;
ret = snd_dmaengine_pcm_register(&pdev->dev,
&ux500_dmaengine_of_pcm_config,
SND_DMAENGINE_PCM_FLAG_COMPAT);
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_dmaengine_pcm_unregister(&pdev->dev);
return 0;
}
EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);
MODULE_AUTHOR("Ola Lilja");
MODULE_AUTHOR("Roger Nilsson");
MODULE_DESCRIPTION("ASoC UX500 driver");
MODULE_LICENSE("GPL v2");
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