93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) ST-Ericsson SA 2012
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*
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* Author: Ola Lilja <ola.o.lilja@stericsson.com>,
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* Roger Nilsson <roger.xr.nilsson@stericsson.com>
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* for ST-Ericsson.
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*/
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#include <asm/page.h>
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#include <linux/module.h>
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#include <linux/dma-mapping.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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#include "ux500_msp_i2s.h"
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#include "ux500_pcm.h"
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#define UX500_PLATFORM_PERIODS_BYTES_MIN 128
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#define UX500_PLATFORM_PERIODS_BYTES_MAX (64 * PAGE_SIZE)
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#define UX500_PLATFORM_PERIODS_MIN 2
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#define UX500_PLATFORM_PERIODS_MAX 48
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#define UX500_PLATFORM_BUFFER_BYTES_MAX (2048 * PAGE_SIZE)
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static int ux500_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params,
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struct dma_slave_config *slave_config)
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{
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
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struct snd_dmaengine_dai_dma_data *snd_dma_params;
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dma_addr_t dma_addr;
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int ret;
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snd_dma_params = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
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dma_addr = snd_dma_params->addr;
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ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
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if (ret)
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return ret;
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slave_config->dst_maxburst = 4;
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slave_config->src_maxburst = 4;
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slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
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slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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slave_config->dst_addr = dma_addr;
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else
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slave_config->src_addr = dma_addr;
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return 0;
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}
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static const struct snd_dmaengine_pcm_config ux500_dmaengine_of_pcm_config = {
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.prepare_slave_config = ux500_pcm_prepare_slave_config,
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};
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int ux500_pcm_register_platform(struct platform_device *pdev)
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{
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int ret;
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ret = snd_dmaengine_pcm_register(&pdev->dev,
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&ux500_dmaengine_of_pcm_config, 0);
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if (ret < 0) {
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dev_err(&pdev->dev,
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"%s: ERROR: Failed to register platform '%s' (%d)!\n",
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__func__, pdev->name, ret);
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(ux500_pcm_register_platform);
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int ux500_pcm_unregister_platform(struct platform_device *pdev)
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{
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snd_dmaengine_pcm_unregister(&pdev->dev);
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return 0;
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}
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EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);
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MODULE_AUTHOR("Ola Lilja");
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MODULE_AUTHOR("Roger Nilsson");
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MODULE_DESCRIPTION("ASoC UX500 driver");
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MODULE_LICENSE("GPL v2");
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